294results about How to "Improve technical economy" patented technology

The invention discloses an easily-soluble magnesium alloy material which comprises the following elements such as Al, Li, Ca, Zn, In, Ga, Si, Zr, and the like. The invention further discloses a preparation method of the easily-soluble magnesium alloy material. The easily-soluble magnesium alloy material is used for producing products such as a ball sealer, a target, and the like, has technical characteristic of being easy to dissolve or quick to degrade, and can be designed into an oil exploitation underground component or an underground component which is used for performing a temporary function or is temporarily needed. Compared with the prior art, the easily-soluble magnesium alloy material has the advantages as follows: a high operation cost problem for secondary drilling or milling is solved or avoided, and technical and economic effects with low cost and high efficiency are obtained. Meanwhile, the magnesium alloy density is proper, molten slag or corrosion products of the magnesium alloy satisfy flow-back operation technical requirements, and technical effects with multiple advantages of being simple, efficient, environment-friendly, energy-saving, and the like, can be obtained.

The invention discloses a mine-hoist constant deceleration safety braking system and a braking method thereof, and relates to the technical field of mine-hoist safety braking control. The system comprises a disk brake, a hydraulic station, an electric control device and a detection feedback device which are arranged on a drum brake disk, wherein a speed sensor arranged on the drum acquires a hoist deceleration signal and inputs the hoist deceleration signal into the electric control device; the electric control device receives the signal and compares the signal with the given speed value to send out a control command; after the control command is processed into an electric signal and compared with an oil pressure signal which is fed back by a pressure sensor on the hydraulic pipeline arranged between the outlet end of an electrohydraulic proportion reversing valve and the disk brake cylinder, an electric signal control command is sent out; and the electrohydraulic proportion reversingvalve of the hydraulic station outputs a hydraulic pressure signal, which varies as the input control command varies, so as to control the motion state of the hoist by the disk brake, thereby realizing constant deceleration safety braking of the mine hoist.

The invention provides a method for trapping SO2 and CO2 on a large scale aiming at a pulverized coal furnace of a power plant. Fume generated by the pulverized coal furnace of the power plant is desulfurized by a desulfurizing tower and then enters a fluidized bed carbonation reactor; CaO in the reactor generates solid Ca(OH)2 under the action of water vapor; Ca(OH)2 particles are subjected to a carbonation reaction to trap CO2; a product CaCO3 enters a fluidized bed calcining furnace; the CaCO3 is decomposed into CaO and CO2 by using the heat generated by oxygen enriched combustion of a biomass fuel; and the CaO is introduced into the carbonation reactor for trapping the CO2 to realize the recycling. The inactive CaO is discharged from the lower part of the fluidized bed calcining furnace, and meanwhile, the calcium-based absorbent is supplemented. Part of inactive CaO discharged from the calcining furnace is introduced into a digestion reaction to form a Ca(OH)2 solution and then enters the desulfurizing tower for desulfurization, so that the respective removal of the SO2 and the CO2 can be realized and the energy consumption of the system can be reduced.

The invention relates to the catalyst field, particularly to a foam silicon carbide based structured catalyst and its application in preparation of butadiene by oxidative dehydrogenation of butylene. The foam silicon carbide based structured catalyst is the catalyst for preparation of butadiene by oxidative dehydrogenation of butylenes, and takes foam silicon carbide with a three-dimensional interconnected pore structure as the carrier. A ferrite catalyst with a spinel structure is loaded on the carrier surface as the main active component, and one or over two of alpha-Fe2O3, gamma-Fe2O3 and Fe3O4 are loaded on the carrier surface as the secondary active components, thus forming the structured catalyst. The structured catalyst can be processed into a plurality of complex configurations like wall flow type, parallel channel type, static hybrid type, granules and the like. The foam silicon carbide based structured catalyst provided by the invention can convert butylene into butadiene through oxidative dehydrogenation, thus reinforcing heat transfer and mass transfer, improving butadiene yield, prolonging the catalyst life, and reducing the energy consumption and material consumption of the reaction process.

Provided is a thickened frame type ballastless track plate. The track plate comprises a base plate, bosses and track bearing tables. The base plate is of a cuboid, the two bosses are symmetrically arranged on one face of the base plate along the axis of the cuboid in the length direction, and the track bearing tables are evenly distributed in the length direction of the upper surfaces of the bosses. A through hole is formed in the base plate and is located between the two bosses symmetrically arranged on the base plate, and a frame structure connected between the two bosses through a transverse reinforcement concrete structure is formed. The thickened frame type ballastless track plate can effectively reduce track plate warping caused by temperature stress, eliminate a pull cracking phenomenon, and enhance running safety and comfort. The thickened frame type ballastless track plate is reasonable in structural stress, light, high in structural strength and capable of effectively improving the stress condition of a sleeper structural system, prolonging the service life of the structure and optimizing rack circuit parameters, improves the circuit transmission characteristic of a resonant track, can be directly and effectively connected with a current high-speed railway CRTS-I ballastless track plate, and is suitable for industrial production.

The invention relates to a method for producing a propylene by comprehensively utilizing a mixed C4, which mainly solves the problems of low chemical utilization added value of the mixed C4 and low comprehensive utilization rate of the prior art. The invention properly solves the problems by adopting the technical proposal comprising the following steps of: 1) adopting the olefin catalytic cracking technique to catalytically crack the olefin in the mixed C4 into a propylene and an ethylene ; 2) utilizing the butene isomerization technique to isomerize the butane in the residual mixed C4 after the first step reaction into a butene-2; and 3) using the olefin dismutation technique to implement the dismutation of the ethylene produced by the butene-2 in the mixed C4 and the first step reaction into the propylene, and the method of preparation can be applied to the industrial production for increasing the production of propylene.

The invention discloses a method for treating arsenic-containing wastewater by using a multiphase Fenton system based on iron oxide. The method is characterized in that firstly, the pH of the arsenic-containing wastewater is adjusted to range from 2.0 to 9.0, then an iron oxide catalyst and a hydrogen peroxide oxidizing agent are added, so that an organic arsenic compound completes form transformation from organic arsenic to inorganic arsenic in the multiphase Fenton system based on the iron oxide, meanwhile, released inorganic arsenic forms Fe-As chemical coordinate bonds through binding state iron central atoms on the surface of the iron oxide to be effectively adsorbed, and the arsenic pollutant in the arsenic-containing wastewater is removed. Degradation from organic arsenic to inorganic arsenic and adsorption of the inorganic arsenic can be finished simultaneously in one step, the iron oxide serves as an efficient adsorption material of the inorganic arsenic as well as a Fenton reaction catalyst for degrading the organic arsenic to the inorganic arsenic, and the treatment cost of the organic arsenic wastewater is effectively reduced while the reaction efficiency and the operation simplicity are greatly improved.

The invention discloses an improved heat integration coal-fired power plant decarbonization system and method, belonging to the technical field of energy conservation and emission reduction. The system mainly consists of two parts, namely a power plant steam turbine power generation unit and a CO2 capturing unit, wherein the two units are communicated through a cooler at the top of an analytic tower, a reboiler and a multi-stage compression cooled heat exchanger. According to the system, the low-pressure cylinder safety performance of the CO2 capture power plant is guaranteed; and meanwhile, due to the integration of the power plant steam turbine power generation unit and the CO2 capturing unit, the steam turbine power generation unit extracts steam and recovers the pressure energy through a small steam turbine, and the heat released by the CO2 capturing unit heats condensate water in the power plant through the cooler at the top of the analytic tower and the multi-stage compression cooled heat exchanger, so that the CO2 capture energy consumption is greatly reduced. According to the integration system, the safety operation of the CO2 capture power plant is guaranteed, the gradient energy utilization is realized, the CO2 emission can be effectively suppressed, the energy consumption of carbon emission reduction is reduced, and high energy utilization efficiency and technical and economic performance are obtained.

The invention relates to fume purification and provides dry-method fume purification method and device for synchronous desulfurization and denitrification. The purification device is provided with an inlet flue, an absorption tower, a dust collector, a material circulating air chute, an absorbent cabin, a water box, a water pump, an atomization spray gun and an outlet flue. In the invention, an additive water solution is stored in a process water box; a primary fume enters the absorption tower through the inlet flue, mixes with an absorbent added form the absorbent cabin and cycled materials returned from the material circulating air chute, and then performs cooling and moistening reaction with the additive water solution pumped by the high-pressure pump from the water box to the atomization spray gun and sprayed by the atomization spray gun to the absorption tower; the outlet fume of the absorption tower enters the dust collector, incompletely reacted materials in the fume are collected, and the major part of the fume enters a circulating fluidize bed absorption tower with the absorbent added in the absorbent cabin through the material circulating air chute to continue the reaction; circulation continues in the same way; and the fume purification is then achieved when the cleaned fume is exhausted from a chimney from the dust collector through the outlet flue.

The invention relates to the technical field of flexible direct-current power transmission, particularly to a method for increasing the capacity of a flexible direct-current power transmission system and an apparatus thereof. According to the invention, by adding a full-bridge sub-module (FBSM) which can generate negative voltage into a bridge arm of a modular multilevel converter (MMC), direct-current output voltage of a transverter is balanced while alternating-current output voltage of the transverter is adjusted, thereby increasing the transmission capacity of the transverter. The method does not have higher requirements on the through-current capability of IGBT elements and proceeding from conventional engineering technologies, the application of flexible direct-current power transmission technologies in practical engineering is substantially optimized.

The invention discloses a hydrofoil and planing combined boat with a retractable front hydrofoil, which comprises a boat body and a propulsion device at the stern of the boat body; the bottom surface of the stern of the boat body serves as a planing surface; the mid-front part of the boat body is a single hull; the mid-rear part of the boat body takes a tri-body boat shape and comprises a middle boat body and side boat bodies; the two sides of the bottom of the middle boat body extend outwards to form arc-shaped grooves which constitute lateral splashing water channels; the front hydrofoil is arranged under the bottom of the mid-front part of the boat body through vertical pillars on the two sides; a pillar axially-moving mechanism is arranged in the boat body; and when the front hydrofoil goes up to the highest position to be inside the bottom of the boat body completely, the planes on the two sides of the front hydrofoil are clung to the two sides of the front part of the boat body to become a part of the outer surface of a fairing of the boat body. The hydrofoil and planing combined boat combines high speed of a planing boat and good seakeeping property and small wave making property of a hydrofoil, overcomes the defect that the planing boat or the hydrofoil is not suitable to rush to a shallow, effectively solves the problem of severe lateral splashing caused by single-hulled or twin-hulled planing, and can serve as a hydrofoil as well as a planing boat.

The invention discloses a railway box wagon door and a railway box wagon. The railway box wagon door comprises a door plank and guide rails, wherein the guide rails are arranged on the side wall or bottom frame of the box wagon in parallel; the door plank is rotatably provided with two groups of rotating shaft units; each rotating shaft unit is composed of a shaft seat and a main shaft; the shaft seats are fixed on the door plank; the main shafts are arranged in the shaft seats in a penetrating manner and can rotate; two ends of the main shaft in each group of rotating shaft unit are both provided with crank throws; a pulley is fixed on the other end of each crank throw; the pulleys are arranged in the guide rails and are guided to slide in the guide rails; a handle which can drive the main shaft to rotate and operate is fixed on the main shaft in one group of spindle unit; and a synchronous door-opening connecting rod mechanism which causes the two main shafts to synchronously rotate is arranged between the main shafts of the two groups of spindle units. The railway box wagon door has the advantages of being simple, reasonable and compact in structure, overcoming various defects in the prior art, improving the integrity and tightness of the wagon door, and realizing the purpose of operating by single person in one time.

The invention provides high-dispersity white carbon black and a preparation method thereof. The preparation method comprises the following steps: (1) heating water, adding water glass, then adding ethyl alcohol, and mixing the water, the water glass and the ethyl alcohol to obtain a reaction base solution, wherein the temperature in the whole process does not change, the concentration of the waterglass is 0.01 to 1.00 mol / L, and the mass percentage of the ethyl alcohol is 0.1 to 5 weight percent; (2) simultaneously adding acid and water glass into the reaction base solution for mixing for reaction, thereby obtaining white carbon black suspension, wherein the reaction temperature is kept constant and is equal to that of the reaction base solution, and the concentration of the water glass is kept constant and is equal to that of the reaction base solution; (3) stopping adding the water glass into the white carbon black suspension, and independently adding acid to adjust the pH of a reaction system to 3.0 to 5.0, thereby obtaining acidified white carbon black suspension; (4) carrying out solid-liquid separation on the acidified white carbon black suspension to obtain a filter cake, thereby obtaining the white carbon black. The white carbon black provided by the invention is extremely high in dispersivity, and shows a good rubber reinforcing effect.

The invention provides a preparation method of hydrophobic white carbon black. The preparation method includes following steps: 1), allowing hydrolysis reaction: mixing silane coupling agent-vinyltriethoxysilane, organic solvent and water for hydrolysis reaction to obtain silane coupling agent hydrolysate, wherein the organic solvent comprises n-heptane and alcohol; 2), allowing modifying reaction: using an atomizer to atomize the silane coupling agent hydrolysate obtained in the step 1), mixing with white black carbon, drying an obtained mixture, and heating for modifying reaction to obtain the hydrophobic white carbon black. The preparation method is simple in preparation process, little in equipment investment, short in production period, high in labor production efficiency and easy forindustrialization and has high technical economic efficiency; the hydrophobic white carbon black is good in mechanical performance and high in hydrophobicity and can well improve processability of rubber when being applied to butadiene styrene rubber, vulcanizing time is shortened, mechanical performance of vulcanized rubber is improved, and wear resistance of rubber is enhanced.

A lightning arrester for protecting elements of electrical facilities or a power transmission line comprises an insulating body which is made of a solid dielectric, preferably in the form of a bar, a strip or a cylinder, two main electrodes that are mechanically coupled to the insulating body and two or more intermediate electrodes. The intermediate electrodes, preferably made in the form of bars or cylinders, are arranged between the main electrodes so that said intermediate electrodes are mutually shifted along the longitudinal axis of the insulating body or along a spiral line. Such design makes it possible to form a discharge channel between the adjacent electrodes. Furthermore, said electrodes are located inside the insulating body and are separated from the surface of the body by an insulation layer. Discharge chambers formed as cavities or through bores opened to the surface of the insulating body are arranged between the pairs of the adjacent electrodes. Dimensions of the chambers are selected such that a discharge is easily blown out from the chambers to the surface of the insulating body, thereby increasing the efficiency of the discharge current quenching. In the preferred embodiments, the arrester is provided with an additional electrode for reducing a flashover voltage. Various embodiments of a power transmission line using the arrester of the invention are also disclosed.

The invention discloses a floating type device integrating wave dissipation and offshore culture, and belongs to the field of comprehensive utilization of structures of coastal engineering. The floating type device comprises wave dissipation units with a net cage function, a floating type wave prevention box and an anchoring structure, and is characterized in that each wave dissipation unit consists of a basic block body, an artificial rigid plant and a net cage type wave dissipation drum; the wave dissipation units are fixedly embedded into the wave prevention box by the basic block bodies and are spliced with one another to form an integrated structure; the whole device floats on a sea surface and is fixed at the seabed through anchor chains. By the combination of three functions of wave dissipation of the floating type wave prevention boxes, revetment of the rigid plants and offshore culture, the floating type device integrating wave dissipation and offshore culture is provided. Due to the design, the wave dissipation performance of the floating type wave prevention boxes can be improved, and good conditions are provided for offshore culture.

The invention discloses a thermal-insulating block which uses dry-method desulphurized ash as a main raw material and also comprises 30 to 50 percent of micropowder slag waste material or fly ash in weight percentage content. In the invention, the dry-method desulphurized ash and the slag or the fly ash are utilized as the main raw materials of the thermal-insulating block, the characteristic of smaller original relative humidity of the dry-method desulphurized ash is fully utilized, and a light thermal-insulating block with certain and suitable dry volume density is obtained by controllingproper temperature and through autoclaved curing. In the invention, an aggregate is synthesized by utilizing the dry-method desulphurized ash and the micropowder slag or the fly ash as the raw materials, and other aggregates do not need to be added, thereby the abrasion of production equipment is reduced, the processing process is simplified, the comprehensive utilization of the dry-method desulphurized ash solid waste is finally realized, and meanwhile, the energy saving and the thermal insulation of a product are realized by utilizing the characteristics of low thermal conduction coefficient and good thermal-insulating effect of the dry-method desulphurized ash material per se.

The invention relates to a jet pipe, a fluidized bed reactor with the jet pipe and a coal catalyzing and gasifying method. A plurality of jet pipes which are in a bed-layer dispersing manner are adopted for feeding oxygen; the jet pipes are in a sleeve type structure; a central pipe is supplied with a mixture gas of oxygen and over-hot steam; the over-hot steam is supplied into annular spaces; the ratio of the oxygen to the over-hot steam is regulated to control the oxygen concentration to be within a certain range; the oxygen and a carbon material are mainly subjected to combustion strong exothermic reaction at a jet flow area; the released heat is used for providing heat for the gasification reaction in the reactor; the over-hot steam supplied into the annular spaces can intensity the internal circulation of carbon material granules, is subjected to heat exchange with a high-temperature gas at a central pipe area, and at the same time provide heat for the gasification heat absorption reaction in the annular spaces, so that partial high-temperature areas are prevented from happening through rapid heat exchange and gasification heat absorption reaction, and the happening rate that the jet pipe area has slag build-up is reduced.

The mainline electric oil pump assembly relates to the field of assemblies for pumping oil in main oil pipelines. The aim of the present invention is to create a mainline electric oil pump assembly with improved technical and economic characteristics, reduced noise and vibrations, and increased reliability, service life and performance. The main distinguishing features of the proposed assembly which contribute to the achievement of the aforementioned aim are: the non-splined, zero-backlash seating of the impeller on a smooth shaft, the use of roller bearings seated in a non-splined, zero-backlash fashion on the smooth shaft, the use of mechanical seals seated in a non-splined, zero-backlash fashion on the smooth shaft, the use of self-correcting adjustable spherical supports under the supporting feet of the pump, and the boring of the seating surfaces of the pump housing for the rotor in a single set-up operation.

The present invention is stone material connecting method with back groove hanger. The fixing assembly includes square pipe, corner unit connected to the square pipe and fixed to the bearing part, and back groove type combined hanger with cylindrical tenon in its one end and including horizontal part and vertical part. The connection method includes inserting the insertion part into the groove in the back of stone material, embedding the cylindrical tenon of the horizontal part into the slot of the insertion part, embedding the vertical part into the slot of the horizontal part, connecting two vertical parts to the square pipe and connecting two corner units to the square pipe. The present invention is especially suitable for decoration of irregularly shaped outer wall, and has great stone material contacting area, high reliability, great bearing capacity, simple installation operation and other advantages.

A Fischer-Tropsch synthetic reaction method is provided. After synthetic gas is dispersed into gas bubbles by a dispersing structure, the gas bubbles are fed into a mixer and fully mixed with a catalyzing solution containing a nanometer catalyst, and the fully mixed reaction stream enters a reaction micro-channel of a microreactor through a stream inlet and is subjected to a Fischer-Tropsch synthetic reaction to produce a hydrocarbon product. Heat generated by the reaction is released through heat exchange with a heat exchange medium in a heat exchange micro-channel, the reaction temperature in the micro-channel of the reactor is 100-250 DGE C, and the reaction pressure is 0.5-4.0 MPa. Materials discharged at a product outlet of the microreactor are synthetic gas, a gas-phase reaction product, a liquid phase containing the nanometer catalyst and a liquid phase reaction product, and are fed into a separator and subjected to gas liquid separation. A liquid phase discharged from a liquid phase hydrocarbon outlet of the separator is a hydrocarbon product. According to the method, the microreactor is adopted, and reaction devices are small in size and compact in structure and have characteristics of good mobility and low investment.

The invention discloses an underground complex integrally co-constructed implementation design method. A co-constructed mode of the invention is adopted for the construction of a basement and a subway station of a development lot. The method comprises the following steps of: separately constructing end wells at both ends of a subway so as to meet the run-through requirement of a running tunnel, and meanwhile, developing a pile foundation and an enclosing structure of the business development lot; and after the end well structures of the subway station are finished, carrying out integral excavation on a foundation pit of a standard section of the basement and the subway station of the development lot. In the design method, the construction period requirements of the basement and the subway station of the business development lot are researched, and then foundation pit regions are reasonably designed; and a corresponding enclosing support design measure is adopted, and on the premise of guaranteeing the engineering quality and a construction period, the engineering construction cost and the development period are maximally saved.

The invention relates to a two-dimensional liquid-liquid phononic crystal topology optimization method, which comprises the following steps of dividing a phononic crystal primitive cell into an N*N square pixel structure; developing a plane wave expansion method program for quickly calculating a two-dimensional liquid-liquid pixel phononic crystal energy band laid by any material according to an acoustic wave equation satisfied by a two-dimensional liquid-liquid phononic crystal dispersion relationship, and calculating a band gap; and finally, searching the optimal material layout of the two-dimensional liquid-liquid phononic crystal primitive cell according to the requirements on the band gap by utilizing a genetic optimization algorithm. The process comprises the following steps of inputting a parameter to be solved, and initializing; calculating individual fitness; sequentially performing the genetic operations of selection, crossover and mutation to generate the next generation of genus group, so that the genus group evolutes forwards; and checking whether the genus group meets a stop condition. Through the topology optimization method, the designability of phononic crystals is enhanced, and the novel phononic crystal structure with optimal band gap characteristics is obtained; and meanwhile, the calculating time is reduced, and the calculating efficiency is improved, so that the designed phononic crystal has the best technical and economic performances.

The invention provides a method for selecting a differentiated construction mode of a smart distribution grid. The method comprises the following steps of (1) constructing a typical differentiated construction mode of the smart distribution grid; (2) establishing a selection model for the differentiated construction mode of the smart distribution grid; and (3) determining a differentiated selection criterion based on a comprehensive evaluation method. According to the method, the differentiated selection of the construction mode of the smart distribution grid can be implemented for development requirements for different types of construction areas, and the technological economy for planning and construction of the smart distribution grid is improved, so that scientific and ordered development of the smart distribution network can be effectively pushed.

The invention relates to a two-dimensional solid-solid phononic crystal XY mode topological optimization method, which comprises the following steps of inputting a problem parameter to be solved, and initializing; calculating a dispersion relationship of a phononic crystal primitive cell XY mode corresponding to each genetic individual to obtain a corresponding forbidden band value by using an improved fast plane wave expansion method; according to an optimized goal, using phononic crystal forbidden bands to build an objective function, and then using the value of the objective function to measure the fitness of the genetic individuals; sequentially performing the genetic operations of selection, crossover and mutation to generate the next generation of genus group, so that the genus group evolutes forwards; and checking whether the genus group meets a stop condition. The traditional experience design idea is eliminated, and the goal of actively designing a phononic crystal structure according to the band gap needs is achieved, so that the designability of phononic crystals is enhanced, and the novel phononic crystal structure with optimal band gap characteristics is obtained; and meanwhile, the calculating time is reduced, and the calculating efficiency is improved, so that the designed phononic crystal has the best technical and economic performances.

The invention relates to a preparation method of a light-weighted autoclaved unburned block, which relates to the integrated utilization of a solid waste. Aerated concrete block waste is crushed into aggregate; dry FGD is mixed with the aggregate, added with water during the stirring and formed, to prepare an adobe; and the adobe is sent into steam to be cured, to prepare the light-weighted autoclaved unburned block. The preparation method of the light-weighted autoclaved unburned block has small finished product density, high strength and lighter weight, realizes the 'zero emission' of the dry FGD in a dry desulfurization process, solves the problem of enterprise product waste piling of the aerated concrete block, and reduces piling sites; the compressive strength and the flexural strength of the unburned block exceed the standard of a national autoclaved lime sand brick superior product; the weight of the produced autoclaved unburned block is 20 percent less than that of the traditional clay brick and autoclaved sand-lime brick on the basis of reaching all strength standards of the traditional red brick; no secondary pollution is produced, and the integrated utilization of resources is realized; and the process is simple, and the investment and treatment cost is low. The preparation method of the light-weighted autoclaved unburned block is universal.

The invention discloses a production and mooring system for a sea floating type oil extraction platform, which includes an in-water production platform, an in-water production system, rigid stand pipes, tension mooring devices, in-water pile foundations and flexible jumper pipes, wherein the in-water production system includes in-water oil extraction equipment and a manifold center; the in-water production platform includes in-water oil extraction platforms and a manifold platform that are all positioned 50-300 m below the sea level; the at least three in-water oil extraction platforms are diffused and placed around the manifold platform. According to the invention, as the single production platform in the prior art is designed into at least three in-water oil extraction platforms and one manifold platform, the problem that the in-water oil extraction equipment, the in-water manifold and the in-water manifold center cannot be distributed in the prior art can be solved, and the in-water manifold and the oil extraction equipment can be arrayed separately, so that the design for the platforms is more professional, and optimized layout of the positioning of the sea floating type oil extraction platform and all functions of the in-water production system can be realized.

The invention provides a ZnO resistor disc. The resistor disc is prepared from, in percentage by mass, 85%-95% of ZnO, 0.5%-5% of Bi2O3, 0.05%-0.5% of Co3O4, 0.5%-2.0% of NiO, 0.1%-2.0% of MnO, 2.0%-8.0% of Sb2O3, 0.01%-1.0% of SiO2, 0.01%-1.0% of Er2O3 and 0.1%-2.0% of Ag2O. The provided resistor disc has the diameter larger than or equal to 115 mm, the varistor voltage gradient reaches 450 V / mmor above, the residual voltage ratio is smaller than or equal to 1.58, 2ms square wave withstanding current is larger than or equal to 2,000 A, 4 / 10 mu s large-current impact withstanding current is 100 kA, the ageing coefficient is smaller than or equal to 1.1, and the varistor voltage change rate is smaller than 6% after impact of 8 / 20 mu s impulse current with the peak value of 3,000 A. According to the technical scheme, the preparation process is simple, the technology economy is high, and existing manufacturing equipment of ZnO resistor discs for lightening arrestors can completely meet the industrial production demands.

The embodiment of the invention provides a coal catalytic gasification method, which belongs to the field of coal catalytic gasification and can enhance the methane yield and carbon conversion rate. The coal catalytic gasification method comprises the following steps: dividing the reactor main body into a hydrogenation pyrolysis zone, a catalytic gasification zone and a combustion zone from top to bottom according to different internal temperatures; introducing oxygen-containing gas into the combustion zone to initiate combustion reaction and gasification reaction between the oxygen-containing gas and coal in the combustion zone, thereby generating carbon dioxide, carbon monoxide and hydrogen; and introducing hydrogen into the catalytic gasification zone to inhibit the carbon monoxide from participating in water gas shift reaction, thereby promoting carbon monoxide to participate in methanation reaction. The method can be used in a coal catalytic gasification technique which utilizes a fluidized bed reactor.