48results about How to "Reduce explosiveness" patented technology

A method for recycling blast furnace ironmaking dust. The bag dust, gravity ash and other iron-containing dust recovered in the blast furnace smelting process are evenly mixed with coal powder, and sprayed into the hearth from the tuyere of the blast furnace. It is required that there is no accumulation in the hearth before injection. , no nodules in the furnace throat, and its process parameters: spray bag dust, the injection amount is 6-10Kg/t iron, hot air temperature> 1000 ℃, blast furnace zinc load <0.15Kg/t iron; spray gravity ash, injection amount is 6Kg/t iron ~ 15Kg/t iron, hot air temperature > 1050°C; spray other iron-containing dust, injection amount < 8Kg/t iron, dust particle size < 0.5mm, hot air temperature > 1050°C; the present invention has the functions of increasing iron, Saving coke, benefiting silicon reduction in molten iron, promoting smooth operation of blast furnace and strengthening smelting, benefiting safe coal injection, reducing nodulation in blast furnace, protecting the environment, and clean production, etc.

The invention relates to a system adopting a high concentration CO2 flue gas as a coal dust drying medium in a boiler and belongs to the technical field of energy technology application and CO2 capture. The flue gas which is dehydrated and heated to a certain temperature and contains over 95 percent of CO2 is used as the drying medium for coal dust pulverizing. The drying medium is an inert gas with low oxygen content so as to solve the problem of easy explosion of a coal pulverizing system when hot air is used as the drying medium and improve the operational safety of the coal pulverizing system. Meanwhile, compared with the temperature of the hot air, the initial temperature of the drying medium can be greatly improved so as to reduce the power consumption of a coal mill, improve the fineness of coal dust, improve combustion efficiency, reduce the exhaust gas temperature and improve the heat efficiency of the boiler.

The invention provides a method for improving the strength of pellets. The method comprises the following steps: respectively and independently mixing magnetite concentrates and non-magnetite concentrates with externally matched bentonite uniformly; pelletizing, wherein pellets comprise not less than 20% of magnetite concentrates and not more than 80% of non-magnetite concentrates, and in the pelletizing process, the magnetite concentrates added for the first time account for 40-80% of total addition of the magnetite concentrates, the mixture of the non-magnetite concentrates and bentonite is added for the second time, the remaining magnetite concentrates are added for the third time, and 1.3-1.5wt% of bentonite is added in the pelletizing process to serve as a binder; carrying out pressure increase and reduction treatment on the pellets. The method has the beneficial effects that the calcination temperatures of ores at the middle layer and crystal bridge connection between the pellets can be improved, the content and existing state of water in the pellets can be changed, the preheating and drying time can be shortened, the preheating and drying temperatures can be reduced, the burst properties of the pellets can be reduced, the strength of the pellets can be improved, the use proportions of hematite, limonite and siderite in the pellets can be increased, and the production cost of the pellets can be lowered.

The invention belongs to the technical field of battery material preparation, and specifically relates to a flame-retardant electrolyte of a lithium ion battery and a preparation method of the electrolyte. The flame-retardant electrolyte consists of a solvent, an accessory solvent, a film forming agent, a cosolvent, flame retardant and lithium salt; the preparation method comprises the steps of performing mixing on ethylene carbonate, diethyl carbonate and methyl ethyl carbonate in a glove box filled with argon to prepare a mixed solvent; next, adding the accessory solvent, the film forming agent, the cosolvent and the flame retardant into the mixed solvent to be mixed uniformly to obtain a mixed liquid; and finally, dissolving the lithium salt into the mixed liquid to obtain the flame-retardant electrolyte of the lithium ion battery. The obtained flame-retardant electrolyte has relatively high flame-retardant effect, so that the safety and reliability of the lithium ion battery can be effectively improved; meanwhile, the flame-retardant electrolyte has relatively high compatibility with a graphite carbon negative electrode; and furthermore, the lithium ion battery assembled by the flame-retardant electrolyte has high electrochemical performance.

The invention discloses an additive amount method of low-rank coal in blast furnace injection coal. The method is characterized by comprising the steps of grinding the low-rank coal by a coal mill to obtain the pulverized coal of the low-rank coal, wherein the weight of the pulverized coal with the particle size of less than or equal to 100 meshes in the low-rank coal accounts for 38.05-93.74% of the total weight of the pulverized coal of the low-rank coal; grinding high-rank coal by the coal mill to obtain the pulverized coal of the high-rank coal; and mixing the pulverized coal of the low-rank coal and the pulverized coal of the high-rank coal to obtain the blast furnace injection coal. According to the method, the limitation for the particle size of the low-rank coal is broadened in the pulverizing process, and the content of the pulverized coal with the particle size of less than or equal to 100-meshe aperture in the low-rank coal is increased, so that the explosiveness of the pulverized coal is reduced, the safety requirement for the blast furnace injection coal is reached, and the coal blending ratio of the high-rank coal and the low-rank coal is increased. Therefore, the consumption of the low-rank coal which is taken as the blast furnace injection coal can be increased, the production cost of iron and steel enterprises is greatly lowered, and the economic benefit of the enterprises can be improved.

A muzzle brake mounts to the barrel of a gun and reduces the recoil when the gun is fired. The muzzle brake comprises a supersonic nozzle including an expansion chamber configured to accelerate the propellant gases exiting the barrel of the gun and a reverser plate to at least partially reverse the flow of the propellant gases to reduce or mitigate recoil.

The present invention relates to a Li-containing SiOx powder (0.5 < x < 1.5) used in a negative electrode of a lithium secondary battery. On a powder particle cross section in a visual field of 1 [mu]m in four directions containing a particle surface and having a definition of 50 pixels * 50 pixels or greater, EELS measurements are performed, and in so doing, the spectral intensities in the Li-K edge domain and the Si-L edge domain are determined. Among the integrated intensities over one row of a particle outermost surface in the visual field, the integrated intensity for the Li-K edge domainis ILi(s), the integrated intensity for the Si-L edge domain is ISi(s), and ILi(s)/(ILi(s) + ISi(s)) is the outermost surface Li intensity ratio R(s). Among the integrated intensities over one row ofa near-surface 500 nm away inward from the particle outermost surface in the visual field, the integrated intensity for the Li-K edge domain is ILi(i), the integrated intensity for the Si-L edge domain is ISi(i), and ILi(i)/(ILi(i) + ISi(i)) is the near-surface Li intensity ratio R(i). Then, the Li-containing silicon oxide powder satisfies R(s)/R(i) < 1.

The invention discloses a matching method of mixed coal with a relatively high heating value. The method comprises the following steps: 1) selecting bituminous coal and anthracite as components of the mixed coal; 2) designing a 6-17 coal blending scheme according to all-anthracite injection and all-series coal blending thoughts of all-anthracite injection, designing a coal injection framework according to anthracite proportion decreasing by m% and bituminous coal increasing by m%, and determining the matching ratio of mixed coal, m being 6.25-20; and 3) selecting the scheme with the highest intersection degree of the combustion rate and the exothermic value index as the scheme of the invention. The anthracite and the bituminous coal are mixed and injected according to a certain proportion, and meanwhile, the dry basis volatile component and the ash content of the mixed coal are well controlled, so that combustion can be mutually promoted, the actual coke replacement ratio of a blast furnace is increased, the explosiveness of the mixed coal powder is greatly reduced, the combustion performance is relatively improved, the generation amount of unburned coal powder is reduced, and the production cost is reduced. And smooth operation of the blast furnace is facilitated.

The invention discloses a main driving gear shaft of an underground ten-meter anti-explosion conveying box. The main driving gear shaft of the underground ten-meter anti-explosion conveying box comprises a driving shaft, a driving gear, shaft bases, a shaft base connecting rack and a shaft end sealing piece, wherein the driving gear located in a long strip-shaped airtight box is installed on the driving shaft, the two ends of the driving shaft penetrate out of the long strip-shaped airtight box, the shaft end sealing piece is arranged at the position where the driving shaft is combined with the long strip-shaped airtight box, the shaft bases are arranged at the two ends of the driving shaft and are located on the two sides of the long strip-shaped airtight box, and the shaft bases are fixed to the long strip-shaped airtight box through the shaft base connecting rack. In this way, the main driving gear shaft of the underground ten-meter anti-explosion conveying box has the advantages that dust pollution can be effectively prevented during material conveyance, and thus the explosibility of materials is effectively reduced; in addition, due to the fact that multiple feeding ports and multiple viewing ports are arranged, feeding of materials and checking of residual materials can be achieved conveniently.

The invention discloses a long-strip-shaped sealed box of a buried ten-meter anti-explosion conveying box. The long-strip-shaped sealed box of the buried ten-meter anti-explosion conveying box is a rectangular long-strip-shaped hollow box body. The left end and the right end of the rectangular long-strip-shaped hollow box body are respectively provided with a detachable end plate. Detection windows are formed in the top face of the left end and the top face of the right end of the rectangular long-strip-shaped hollow box body. A discharging port is formed in the bottom of the left end of the long-strip-shaped sealed box. A top feeding port, a unilateral feeding port and a bilateral feeding port are formed in the right end of the long-strip-shaped sealed box in sequence from right to left. In this way, flowing dust pollution caused during material conveyance can be effectively avoided, and therefore the explosibility of materials can be lowered. Due to the fact that the long-strip-shaped sealed box of the buried ten-meter anti-explosion conveying box is provided with the multiple feeding ports and observation openings, feeding is convenient, and detection of material residuals is convenient.

The invention discloses a method for reducing ammonia content and blasting property of a medium-pressure emptying gas in urea production. The method comprises the following steps: increasing a packing absorption layer on the lower part of a medium-pressure ammonia absorber, reducing the ammonia content of the medium-pressure emptying gas, and continuously adding 2.2MPa nitrogen into the medium-pressure ammonia absorber equipment for preventing the medium-pressure emptying gas from entering an explosion limit. According to the process method, the ammonia content in the medium-pressure emptying gas is greatly reduced, the ammonia recovery efficiency is high, the operation is simple and reliable, and a liquid level in a medium-pressure inert gas scrubbing tower is easily stabilized. According to the introduced nitrogen, partial pressure of combustible gases such as hydrogen and methane in the emptying gas can be greatly reduced, so that the blasting property of the emptying gas is reduced, and the safety performance of the device is improved.