53results about How to "Avoid unstable operation" patented technology

The invention discloses a bell-less material distributing method capable of ensuring stable running of a blast furnace. The material distributing method can protect a middle thin belt of a coke layer to prevent part of a coke window from being too narrow to effectively solve the problems of blast furnace gas turbulence and un-smooth charging falling, caused by over-narrow part of the coke window, thereby ensuring stable running of the blast furnace. According to the method, charging can fall stably, and the airflow distribution can be stable, so that the blast furnace can run stably for a long time, and ironmaking cost can be reduced.

In a semiconductor integrated circuit device, a first control signal outputted from the power voltage evaluation circuit controls power voltage of the power voltage generation circuit so that the power voltage becomes lower within a range over which the internal circuit normally operates, while a second control signal outputted from the specified voltage detection circuit controls the power voltage of the power voltage generation circuit so that the power voltage generated by the power voltage generation circuit does not become equal to or higher than a specified voltage. This makes the power voltage as low as possible within the normally operational range of the internal circuit and suppresses increase of the gate current, so that unstable operations and current consumption increase of the MOS transistor can be prevented.

Duplex communication methods and systems with maximum gain limiting such as in telephone handsets and speaker phones are disclosed. The communications system such as a telephone set may generally include a digital signal processor (DSP) having a receive and transmit path in communication with a receiver and a transmitter, respectively, a volume amplifier for amplifying signals on the receive path, and a maximum gain limiter for determining a total return loss between the receive and transmit paths and for limiting a volume amplification level of the volume amplifier to a maximum depending on the total return loss. The maximum gain limiter determines the total return loss by maintaining a total loop gain for the telephone set at less than 0 dB to prevent unstable operation and howling.

The invention discloses hydraulic walking pushing system pump stations. A main control center comprises a jacking, pushing and rectifying displacement standard setting unit, a jacking, pushing and rectifying real-time displacement data input receiving unit, a jacking, pushing and rectifying control unit, a jacking, pushing and rectifying executing unit and a PLC automatic control unit, wherein the jacking, pushing and rectifying displacement standard setting unit is used for inputting the displacement standard set values of jacking, pushing and rectifying; and the jacking, pushing and rectifying real-time displacement data input receiving unit is used for receiving real-time displacement data of jacking, pushing and rectifying. The hydraulic walking pushing system pump station has the advantages that the multiple pushing units are subjected to three-dimensional control through one main control system so as to achieve continuous and synchronous working, the control precision is high, and the manpower cost is reduced; the expandability and the universality are high, the pushing units can be increased or decreased by increasing or decreasing the pump stations and jacks, and accordingly the requirements for construction of engineering of different spans and different tonnages are met; components do not need to be temporarily reinforced, equipment can operate till construction is completed after being installed in one time and does not need to be disassembled halfway due to the fact the length of a steel strand is not enough, and the bridge building cost can be reduced; and a dynamic rectifying function is achieved, and the defect that the equipment only can move forwards while cannot move backwards in a common traction mode is overcome.

The invention relates to a method for raising diesel yield through gasoline-diesel fractionating towers. The method comprises the steps of controlling the temperature of the top of a fractionating tower, cooling top circulation oil, sending the cooled top circulation oil into dehydration facilities, removing free water contained by the top circulation oil through gravity sedimentation and returning the dehydrated top circulation oil to a tray on the upper part of the fractionating tower. The fractionating tower adopts a dehydration process on a top circulation part, effectively reduces the temperature of the top of the fractionating tower by about 10 DEG C, and can raise the diesel yield by 5 to 8 percent. The diesel yield rises from 33 percent to 40 percent; the ratio of diesel to gasoline is up to over 1.15; and the top of the catalytic cracking fractionating tower has an extremely low temperature, which takes a lead in China. The method has the advantages of widening diesel distillation range and achieving the objective of greatly increasing the diesel yield. The use of a fractionating-tower top-circulation dehydration process also produces energy-saving benefit, such as the utilization of low-temperature waste-heat recovery, the load reduction of aerostatic presses, and the like.

An expander-integrated compressor (5A) has a compression mechanism (21) for compressing a refrigerant and an expansion mechanism (22) for expanding the refrigerant. The compression mechanism (21) is located above the expansion mechanism (22) inside a closed casing (10) and shares a rotating shaft (36) with the expansion mechanism (22). An oil pump (37) is provided at the lower end of the rotating shaft (36). The oil pump (37) is immersed in oil in an oil reservoir (15). Usually, the oil is placed in the oil reservoir (15) in such a manner that the oil level (OL) is located above a lower end portion (34e) of a vane (34a) of a first expansion section (30a). More preferably, the oil is placed in such a manner that the expansion mechanism (22) is immersed in the oil. An oil supply passage (38) for guiding the oil to the compression mechanism (21) is formed inside the rotating shaft (36). A suction port (37a) of the oil pump (37) is provided below the lower end portion (34e) of the vane (34a).

In a circulating body driven with its surface being circulated along a fixed route and comprising a base material having a tubular outside peripheral surface and a surface layer covering the outside peripheral surface of the base material, the surface static friction coefficient of the surface layer is designed to be 0.06 or less with common paper at 100° C.

The invention discloses a cascade energy storage system and method for improving power quality of a power grid. The system comprises distributed energy storage units, a low-voltage module group and ahigh-voltage module group, wherein the low-voltage module group comprises a plurality of cascaded H-bridge circuits; the low-voltage module group is connected to a low-voltage alternating current busthrough a filter; the high-voltage module group comprises a plurality of the cascaded H-bridge circuits; the high-voltage module group is connected in parallel between a low-voltage bus and a high-voltage bus through the filter; each distributed energy storage unit is connected to the low-voltage module group or the high-voltage module group through one of the H-bridge circuits; and each distributed energy storage unit is connected to the corresponding module group through the H-bridge circuit to form a three-phase independent structure. Through the cascade H-bridge series structure, the energy storage system can be directly connected to the medium-voltage or even high-voltage power grid without isolation of a transformer, and the voltage of the direct-current side of CHB connected to theenergy storage system does not need to be very high, and thus the flexibility and reliability of the operation of the energy storage system are improved.

The invention discloses a walking pushing system. A power device comprises a plurality of hydraulic pump station single bodies. Each hydraulic pump station single body is provided with a unit radial plunger pump capable of achieving multi-port and multi-pressure output, and each hydraulic pump station controls at least two pushing units. A main control center sends a command to each hydraulic pump station single body and controls each hydraulic pump station to work. Each pushing unit comprises a lifting device and a pushing device, wherein a lifting jack is fixed to the lifting device, and the upper portion of the lifting jack and a spherical plate are connected into a spherical concave-convex groove connection structure or an arc-shaped concave-convex groove connection structure. The walking pushing system has the advantages that continuous and synchronous working is achieved by achieving three-dimensional control over the multiple pushing units through one main control system, the control precision is high, the labor intensity is relieved, and the labor cost is reduced; the structure is compact and simple, disassembly and assembly are easy, the cost is low, and the working space is small; equipment does not need to be dismounted till the work is completed after being mounted once, and the defect that only advancing can be achieved and retreating cannot be achieved by a conventional pulling way is overcome; and a dynamic deviation correcting function is achieved, and deviation correction can be conducted in time in the advancing process.

The invention relates to a multilayer-roller-bed steering machine and a tree type roller bed conveying system of the dismantling industry thereof. The multilayer-roller-bed steering machine comprises a base and roller bed sections. The base comprises n layers of frames, and the edge portion of the frame of each layer is provided with a steering motor with a driving chain wheel and a limiting stopper. The steering machine comprises corresponding n layers of roller bed sections, the lower face of the middle portion of the roller bed section of each layer is connected with a driven chain wheel and a steering bearing and is in rotating fit with the upper face of the middle portion of the frame of each layer, the edge portion of the roller bed section of each layer is provided with a trigger block corresponding to the limiting stopper on the frame of each layer, the driven chain wheels are connected with the driving chain wheels on the frames of all layers through steering chains, and the upper portion of the roller bed section of each layer is provided with a material sensor for detecting materials. On the premise of reducing dismantling occupied area, conveying roller beds with multiplied length and the roller bed conveying system with doubled tree type join numbers are set up, economic and social benefits of abandoned automobile and electric appliance dismantling enterprises are substantially improved, and a novel way is provided for development and expansion of the abandoned automobile and electric appliance dismantling enterprises.

The invention discloses a power take-off gearbox casing and a power take-off gearbox directly connected to a hydraulic pump, which solve the problems of excessive oil stirring and high oil temperature of the gears in the prior art, and solve the problems caused by the excessive stirring of the gears. It solves the problem of heat dissipation caused by oil and solves the problem of lubrication of multiple bearings. The scheme is as follows: a power take-off gearbox casing directly connected to a hydraulic pump comprises that the power take-off gearbox casing is sequentially divided into a ventilation cavity, a main cavity, a first oil storage cavity and a second oil storage cavity through inner ribs, Oil passages are respectively provided between the main cavity and the two oil storage cavities, the ventilation cavity is isolated from the main cavity, and a first oil collecting pool is arranged above the position between the first bearing and the second bearing in the main cavity, and the third A second oil collecting pool is arranged above the bearing.

The invention provides a copper-based methanol synthesis catalyst and a preparation method thereof. The method includes the steps that copper-zinc mixed liquor is mixed with a first precipitator aqueous solution in a parallel flow mode, the pH is controlled to be 7-8, standing is performed for ageing, and slurry A is formed; a second precipitator aqueous solution is added into a soluble aluminum salt aqueous solution, the pH is controlled to be 7-8, the temperature is controlled to be 40-50 DEG C, standing is performed for ageing, and slurry B is obtained; the slurry A and the slurry B are mixed and filtered, a solid phase is washed, dried, roasted and formed, and the copper-based methanol synthesis catalyst is obtained. According to the preparation method, the steps are simple, the controllability is high, the raw material source is wide, and industrialization is easy to achieve; by the adoption of the preparation method, the copper-based methanol synthesis catalyst with high catalytic activity and heat stability can be obtained and is suitable for producing methanol with synthesis gas containing CO, CO2 and H2 under the low temperature and low pressure conditions; besides, the catalyst does not need reduction before use and can be conveniently applied and popularized on a large scale.

To solve problems arising when a power conditioner equivalent to that connected to a solar panel is connected to a power storage device.Direct-current power generated by the solar panel 9 is supplied to a DC-DC converter 51 and output as a predetermined direct-current voltage. The output voltage of the converter 51 is supplied to a DC-AC inverter 52. Direct-current power generated by the power storage device 11 is supplied to a DC-DC converter 55. Predetermined direct-current power from the converter 55 is supplied to a DC-AC inverter 56. Alternating-current power output by the inverter 56 is supplied to an alternating-current power system at home. The converter 55 is configured to have two output voltages. The first output voltage is a standby voltage. The second voltage is a voltage at which the inverter 56 starts power supply to outside.

A method involves carrying out a reaction in liquid phase by using a heterogeneous catalyst particle in a reactor. The objective method comprises the steps of: (a) allowing a reaction liquid 40 supplied into the reactor 10 from such as a supplying inlet 12 to react in the presence of the heterogeneous catalyst particle 30, and (b) passing the resultant reaction liquid 40 containing the heterogeneous catalyst particle 30 through a line screen 20 having an opening width where the heterogeneous catalyst particle 30 is not allowed to pass substantially, and then extracting the reaction liquid 40 separated from the heterogeneous catalyst particle 30 from the reactor 10 by way of such as an extracting outlet.

An expander-integrated compressor (5A) has a compression mechanism (21) for compressing a refrigerant and an expansion mechanism (22) for expanding the refrigerant. The compression mechanism (21) is located above the expansion mechanism (22) inside a closed casing (10) and shares a rotating shaft (36) with the expansion mechanism (22). An oil pump (37) is provided at the lower end of the rotating shaft (36). The oil pump (37) is immersed in oil in an oil reservoir (15). Usually, the oil is placed in the oil reservoir (15) in such a manner that the oil level (OL) is located above a lower end portion (34e) of a vane (34a) of a first expansion section (30a). More preferably, the oil is placed in such a manner that the expansion mechanism (22) is immersed in the oil. An oil supply passage (38) for guiding the oil to the compression mechanism (21) is formed inside the rotating shaft (36). A suction port (37a) of the oil pump (37) is provided below the lower end portion (34e) of the vane (34a).

A circulating body driven with its surface being circulated along a fixed route and having a base material provided with a tubular outside peripheral surface and a surface layer covering the outside peripheral surface of the base material, the surface static friction coefficient of the surface layer is designed to be 0.06 or less with common paper at 100° C.

To solve problems arising when a power conditioner equivalent to that connected to a solar panel is connected to a power storage device.Direct-current power generated by the solar panel 9 is supplied to a DC-DC converter 51 and output as a predetermined direct-current voltage. The output voltage of the converter 51 is supplied to a DC-AC inverter 52. Direct-current power generated by the power storage device 11 is supplied to a DC-DC converter 55. Predetermined direct-current power from the converter 55 is supplied to a DC-AC inverter 56. Alternating-current power output by the inverter 56 is supplied to an alternating-current power system at home. The converter 55 is configured to have two output voltages. The first output voltage is a standby voltage. The second voltage is a voltage at which the inverter 56 starts power supply to outside.

The invention discloses an initialization method and system for electromagnetic transient simulation of a permanent magnet direct driven wind-driven generator. The method comprises the steps of: obtaining the set active power, the set reactive power and the set terminal voltage of the permanent magnet direct driven wind-driven generator; calculating the theoretical parameter of the permanent magnet direct driven wind-driven generator; using the theoretical parameter as the input of the first stage of a signal selector to obtain the integral output of the double closed loop control of a grid-side converter and a generator-side converter to complete a first initialization phase; obtaining the control loop output parameter of the permanent magnet direct driven wind-driven generator, and calculating the dq-axis output voltages of the grid-side converter and the generator-side converter; using the control loop output parameter and the dq-axis output voltages of the grid-side converter and the generator-side converter as the input of the second stage of the signal selector to obtain the integral output of the double closed loop control of the grid-side converter and the generator-side converter to complete a second initialization phase. The method can make the permanent magnet direct driven wind-driven generator directly operate in a given stable state, and reduces the simulation time and the storage space consumed by the initialization process.

The invention provides a copper-based methanol synthesis catalyst and a preparation method thereof. The method comprises: mixing the copper-zinc mixed solution and the first precipitant aqueous solution in parallel, controlling the pH to be 7-8, and standing for aging to form a slurry A ; Add the second precipitant aqueous solution to the soluble aluminum salt aqueous solution, control the pH to 7-8, and the temperature to 40-50°C, leave it to age to obtain slurry B; mix slurry A and slurry B, filter, and pass through the solid phase Washing, drying, roasting, molding treatment, that is, the copper-based methanol synthesis catalyst is obtained. The above preparation method has simple steps, strong controllability, wide sources of raw materials, and easy industrialization. The preparation method of the present invention can obtain a copper-based methanol synthesis catalyst with high catalytic activity and thermal stability, which is suitable for the synthesis of methanol containing CO, CO2, H2 The synthesis gas can produce methanol under the condition of low temperature and low pressure, and the catalyst of the invention does not need to be reduced before use, which is convenient for large-scale popularization and application.

The invention discloses an electric heating dipping and drying rotary kiln, which is suitable for dipping and drying processes in a preparation process of a conductive catalyst, and is provided with a rotary pipe, a power supply positive electrode and a power supply negative electrode in the rotary pipe, and a solid material inlet, a solid material outlet, a gas phase outlet and a liquid phase material inlet and / or outlet on the rotary pipe. The power supply positive electrode and the power supply negative electrode in the rotary pipe are conductively connected with a heating power supply through electric brushes. A solid material between the power supply positive electrode and the power supply negative electrode is used as a resistor for heating and drying. The electric heating dipping and drying rotary kiln is also used as a dipping tank of a supported catalyst, and becomes dipping and drying integrated equipment. Compared with the prior art, the electric heating dipping and drying rotary kiln is high in heating speed and uniform in heating, catalyst active components are uniformly loaded in single catalyst carrier particles and among particles, and catalyst products are easy to discharge after drying is completed.

The invention proposes a unit data synchronization method, a unit data synchronization system and a computer readable storage medium, relating to the field of automation technology. The unit data synchronization method provided by the invention includes the steps that: a data synchronization source end sends its own complete machine identifier and control parameters to a data synchronization destination end; the data synchronization destination end stores the control parameters matched with the fields in a communication protocol version of its own, and updates the stored complete machine identifier according to the complete machine identifier of the data synchronization source end. In this way, the data synchronization destination end is capable of storing the data from the data synchronization source end according to its own communication protocol version, thereby achieving best-effort data synchronization, ensuring the correctness of successfully synchronized data, preventing unstable operation of the device caused by data synchronization errors, and improving the compatibility of the unit equipment.

The embodiment of the invention relates to a permanent magnet synchronous motor control method and device based on an extended potential observer, which are used for correcting disturbance of internal parameters of a motor caused by considering harmonic components generated in the motor. The method comprises the following steps: 1, establishing a d-q axis voltage model and a load torque equation of the permanent magnet synchronous motor; 2, constructing a voltage harmonic equation by considering a motor harmonic component in extended potential estimation; and 3, establishing a correction position loop state observer model.

The invention discloses a transformer monitoring device based on a thermal imaging principle. The device comprises a monitoring box, a monitoring mechanism, a closing mechanism and a transformer body. The monitoring mechanism is arranged at the upper end of the interior of the monitoring box, the closing mechanism is arranged on the left wall of the interior of the monitoring box, and the transformer body is arranged in the monitoring box. According to the transformer monitoring device based on the thermal imaging principle, an infrared thermal imaging sensor is installed in the monitoring box, heat generated by a transformer body and overall heat distribution data can be sent to monitoring personnel, a servo motor is started to drive a lead screw to rotate, a movable seat moves left and right along the interior of a movable sliding groove, real-time temperature monitoring can be conveniently carried out on the whole transformer body, multiple infrared thermal imaging sensors do not need to be arranged, cost is saved, and the situation that data of temperature monitoring on the transformer by a traditional temperature sensor is inaccurate is avoided.

The present invention relates to the technical field of sewage treatment, in particular to a sewage lifting device, which includes a box body in which a sewage pump is arranged. There is a dirt storage, the dirt storage is provided with a backwash filter device, and the dirt storage is connected to the sewage pump outlet, the tank water inlet and the tank water outlet. The invention scientifically and rationally solves the problem of transporting the dirt in the sewage to the urban sewage pipe network by adding a backwashing filter device.

The invention discloses a cascade energy storage system and method for improving power quality of a power grid. The system comprises distributed energy storage units, a low-voltage module group and ahigh-voltage module group, wherein the low-voltage module group comprises a plurality of cascaded H-bridge circuits; the low-voltage module group is connected to a low-voltage alternating current busthrough a filter; the high-voltage module group comprises a plurality of the cascaded H-bridge circuits; the high-voltage module group is connected in parallel between a low-voltage bus and a high-voltage bus through the filter; each distributed energy storage unit is connected to the low-voltage module group or the high-voltage module group through one of the H-bridge circuits; and each distributed energy storage unit is connected to the corresponding module group through the H-bridge circuit to form a three-phase independent structure. Through the cascade H-bridge series structure, the energy storage system can be directly connected to the medium-voltage or even high-voltage power grid without isolation of a transformer, and the voltage of the direct-current side of CHB connected to theenergy storage system does not need to be very high, and thus the flexibility and reliability of the operation of the energy storage system are improved.

A disk drive apparatus includes a drive section, which has a disk, a motor for supporting and rotating the disk, a head configured to perform an information processing operation with respect to the disk, and a head actuator supporting the head for movement relative to the disk, and a shock sensor for detecting the respective levels of a shock and a vibration externally applied to the drive section. The apparatus includes a compensation filter for amplifying the shock and vibration levels in a frequency band corresponding to the resonance frequency of the drive section, out of the shock and vibration levels detected by means of the shock sensor. A control section stops the information processing operation of the head when given values are exceeded by the external shock and vibration levels detected by means of the shock sensor and inputted through the compensation filter.

The invention relates to a safe sealed desulfurization reaction tank which comprises a reaction tank body, an inlet separation plate, baffle plates, partition plates, a gas phase baffle plate and defoaming nozzles; one end of the reaction tank body is provided with a desulfurization liquid inlet, and the other end of the reaction tank body is provided with a desulfurization liquid outlet; the gas phase baffle plate is arranged at one end close to the desulfurized liquid outlet and divides the reaction tank body into a coal gas separation section and a pressure balance section; the inlet separation plate is arranged under the desulfurization liquid inlet; a plurality of baffle plates and partition plates are arranged in the reaction tank body; a plurality of defoaming nozzles are arranged at the top of the reaction tank body; the top of the reaction tank body of the gas separation section is provided with a gas outlet, and the top of the reaction tank body of the pressure balance section is provided with a diffused gas outlet. The problem of environmental pollution caused by direct diffusion of diffused gas of a conventional desulfurization reaction tank is solved, the potential safety hazard that a large amount of coal gas directly enters a pressure balance system is eliminated, and meanwhile, the coal gas entrained by desulfurization liquid entering a downstream regeneration device is effectively reduced.

The invention discloses a method of avoiding multi-circuit DC continuous commutation failure of a multi-circuit DC power transmission feed-in system, which comprises the following steps of: 1, selecting any one circuit DC power transmission system as a current-circuit DC power transmission system to receive signals detected by commutation failure of other-circuit DC power transmission systems, andconsidering a commutation result of the current-circuit DC power transmission system, and 2, respectively judging the authenticity of the signals detected by the commutation failure of the current-circuit DC power transmission system and other-circuit DC power transmission systems. According to the method, signal interaction between multi-infeed DC power transmission control protection systems isestablished, the numerical value of a turn-off angle is set and increased according to the commutation failure conditions of other-circuit DC systems and the commutation failure conditions of the current-circuit DC system, so that the problem of continuous commutation failure of multi-circuit DC caused by the fault of a single AC system is solved, and unstable operation of an AC large power gridsystem caused by continuous commutation failure of multi-circuit DC is avoided.

The invention discloses a bell-less material distributing method capable of ensuring stable running of a blast furnace. The material distributing method can protect a middle thin belt of a coke layer to prevent part of a coke window from being too narrow to effectively solve the problems of blast furnace gas turbulence and un-smooth charging falling, caused by over-narrow part of the coke window, thereby ensuring stable running of the blast furnace. According to the method, charging can fall stably, and the airflow distribution can be stable, so that the blast furnace can run stably for a long time, and ironmaking cost can be reduced.