276 results about "Tank pressure" patented technology

The invention discloses an intelligent monitoring method and system for an intelligent breather valve, and relates to the technical field of intelligent valve monitoring. Fitting a circulation volume curve based on the uploaded tank body pressure and circulation volume in combination with data of valves with different calibers; the opening state of the valve is judged according to the logic relation between the state of the proximity switch and the pressure of the tank body; and calculating the discharge amount or the suction amount based on the opening state of the valve and the circulation volume curve. According to the method, on the basis of the relation between the tank pressure and the circulation volume, the circulation volume curve is fitted through the quartic equation, errors of a traditional linear model are avoided, and the applicability to valves with different calibers is guaranteed. The opening state of the valve is judged according to the proximity switch state and pressure relation, and the defect that a traditional system is inaccurate or delayed in judgment of the valve state is overcome. By calculating the emission amount and the suction amount and combining VOCS concentration monitoring, emission of harmful gas is effectively reduced, and the environmental protection requirement is met.

The invention relates to the technical field of hydrogen energy storage and control, and discloses a hydrogen storage tank pressure and temperature control method and device based on model predictive control, and the method comprises the steps: determining a hydrogen state equation of a hydrogen storage tank, and constructing a hydrogen mass conservation equation and a hydrogen energy conservation equation; based on the hydrogen mass conservation equation and the hydrogen energy conservation equation, a state prediction model of the hydrogen storage tank state related to the net hydrogen flow change is established, and the hydrogen storage tank state comprises hydrogen pressure and hydrogen temperature; a target function is constructed with the hydrogen storage tank state and the net hydrogen flow as control targets, and constraint conditions are configured; on the basis of the input net hydrogen flow sequence of the state prediction model and the predicted hydrogen storage tank state sequence output by prediction, the target function is subjected to minimum solving, and the optimal net hydrogen flow sequence is obtained through iteration; and adjusting an inlet / outlet valve of the hydrogen storage tank based on the optimal net hydrogen flow sequence. The operation efficiency of the hydrogen storage system can be improved.

The invention relates to the technical field of cooling water abnormity monitoring, in particular to a steel slag pressure hot stuffy rolling cooling water abnormity alarm system and method.Roll gap cooling water flow, injection temperature, hot stuffy tank pressure and bearing vibration data are collected, a dynamic mapping relation between position coordinates of a spraying opening and a water inlet valve is established, temperature and pressure time sequence offset is calculated, and the temperature and pressure time sequence offset is calculated; the temperature judgment boundary is corrected by combining the pressure bearing limit value of the sealing ring and the real-time flow, and an abnormal alarm is triggered according to the temperature over-limit frequency in the continuous time period. A multi-source analysis framework is constructed by integrating temperature, flow, pressure and vibration parameters, single-point monitoring limitation is eliminated, nonlinear influence of the flow on tank pressure is quantified by adopting a dynamic weight model, a self-adaptive temperature threshold value is generated in combination with a sealing pressure bearing limit, dynamic coupling of an alarm mechanism is realized, an abnormal scene is positioned based on time sequence analysis and coordinate mapping, and the accuracy of monitoring is improved. The sealing hidden danger is pre-judged through the thermal unbalance coefficient, and the pressure rate deviation is intercepted in real time.

The invention discloses an automatic pneumatic conveying and pressure regulating and controlling method for coking fly ash, and relates to the field of coking fly ash treatment. The mode that a plurality of conveying tanks work alternately is adopted, it is guaranteed that one tank is in a preparation or pressurized state at any time, the other tank conducts conveying operation, and therefore the continuity and stability of the system are guaranteed. And secondly, by calculating the conveying amount of coking fly ash per hour and setting the tank pressure target value corresponding to each conveying tank based on the conveying amount, the whole conveying process can adapt to changes of production requirements, and stable pressure control can be kept. Moreover, nitrogen is used as a fluidizing medium, so that the problem of material blockage is effectively avoided, and the conveying efficiency and safety are improved. In addition, assemblies such as a powder adjusting valve and a pneumatic adjusting valve are arranged, the opening degree of the valves is dynamically adjusted according to the real-time conveying speed, and accurate control over the flow and stable maintenance of pressure in the conveying process are guaranteed.

The invention discloses an air distribution device for semiconductor processing and an air supply system thereof. The air distribution device comprises an air distribution block, a plurality of air distribution pipelines communicated with the air distribution block, and automatic pressure control valve assemblies arranged in the air distribution block, wherein the number of the automatic pressure control valve assemblies is the same as that of the air distribution pipelines; an air inlet channel and a plurality of air distribution channels communicated with the tail end of the air inlet channel are arranged in the air distribution block; an automatic pressure control valve assembly is arranged in each gas distribution channel, and the automatic pressure control valve assemblies automatically control the gas distribution opening degree of the gas distribution channels according to the current pressure of the gas distribution channels. The automatic pressure switch valve is arranged in the gas distribution block, the opening degree of each gas distribution channel can be kept consistent, so that the output gas flow is the same, meanwhile, as the automatic pressure switch can adjust the opening degree according to the gas pressure, when the pressure of the gas storage tank is reduced, the injection pressure of the gas outlet can still be kept, and finally the uniformity and high pressure of the gas quantity of each sub-chamber are realized. And the film deposition quality is improved.

The invention provides a device and a method for reducing exhaust loss by using the pressure of a liquid hydrogen storage tank, and relates to the technical field of liquid hydrogen storage and transportation safety. The device comprises an adsorption storage assembly, a desorption recovery assembly and an adsorption enhancement assembly which are arranged in a gas pillow of the liquid hydrogen storage tank. The adsorption and storage assembly is communicated with the air pillow through a one-way mechanical low-temperature valve, is internally provided with a solid adsorption material and a vacuum heat insulation cylinder, and is used for adsorbing and storing evaporation gas and reducing the tank pressure when the tank pressure is increased; the adsorption enhancing assembly comprises a low-temperature hydrogen regulating valve and a low-temperature heat exchanger, and the throttling effect of high-pressure hydrogen in the tank is used for refrigerating an adsorption material, so that the adsorption capacity of the adsorption material is improved; the desorption recovery assembly heats an adsorption material through an intermediate heater, and controllable release of hydrogen is achieved. According to the invention, the active management of the pressure of the liquid hydrogen storage tank and the efficient recovery of the boil-off gas are realized, the exhaust period is obviously prolonged, the hydrogen loss is reduced, and the storage and transportation economy and safety are improved.

The utility model relates to the technical field of pressure testing, and discloses a tank body pressure testing device, which solves the problem of tank body pressure testing in the current market, and comprises a main tank body, a top sealing cover fixedly connected to the top of the main tank body, a supporting column fixedly connected to the bottom of the main tank body, and a pressure release valve arranged at the bottom of the main tank body, a heating box is fixedly connected to one side of the main tank body, a control machine body is fixedly connected to one side of the heating box, a pressure pump is fixedly connected to the other side of the heating box, and a side supporting table is fixedly connected to the bottom of the pressure pump. The stability of the supporting column in the supporting process is improved, and the testing accuracy is improved; and meanwhile, the cooling liquid circulates along the inner side of the circulating box, so that the thermal insulation layer can be uniformly and quickly cooled, the cooling efficiency of the main tank body is improved, and the pressure test time of the main tank body is shortened.

The invention provides a high-reliability arcing protection design C-GIS switch cabinet, and relates to the technical field of switch cabinets, the high-reliability arcing protection design C-GIS switch cabinet comprises a cabinet body frame, a mechanism operation chamber is arranged at the upper end of the front side of the inner wall of the cabinet body frame, a low-voltage chamber is arranged at the lower end of the front side of the cabinet body frame, and a core gas box is arranged at the upper end of the middle in the cabinet body frame; a circuit breaker chamber is arranged at the middle end in the cabinet body frame; the independent circuit breaker pressure relief channel is arranged between the cable chamber and the low-voltage chamber, a bidirectional pressure buffering mechanism is formed by matching with the one-way explosion venting plate, rapid directional pressure relief can be achieved when the circuit breaker chamber breaks down, door body impact can be relieved through cross-chamber pressure relief when the cable chamber arches, and an overflow path of arcing gas is effectively blocked; the front, middle and rear three-section type compartment layout strictly separates a pressure relief channel from a functional chamber, and cooperates with an independent upper gas tank pressure relief channel, so that the arcing influence range is greatly reduced, and the cascading failure risk is reduced from the spatial isolation level.

The invention discloses a low-temperature liquid storage tank pressure prediction method based on a non-thermal equilibrium state model, and aims to improve the calculation speed of a pressure evolution law so as to reduce the time required for predicting the pressure of a storage tank. The method comprises the steps that firstly, a pressure sensor, a temperature sensor and a liquid level meter are used for collecting the temperature of a current gas phase and liquid phase area of the low-temperature liquid storage tank, the pressure in the storage tank, the vacuum degree of a heat insulation layer and the real-time liquid level; secondly, transmitting signal data obtained by monitoring of the sensor to a processor, and checking the density, phase change latent heat and thermodynamic energy of gas and liquid phases in the storage tank through REFPROP software; then establishing a three-dimensional model and a heat and mass transfer relationship of the storage tank, and performing heat transfer analysis on gas-phase and liquid-phase media in the storage tank; secondly, performing energy analysis on a gas phase region, a liquid phase region and a gas-liquid interface in the storage tank according to the established three-dimensional model and a heat transfer analysis result, and selecting a proper time step to perform iterative calculation so as to ensure the calculation precision of each step; storing the calculation result of the previous step, and searching and taking thermodynamic parameters of the next time step through REFPROP software according to the parameters obtained through calculation; finally, the safe storage time of the storage tank under the current liquid filling volume and the heat insulation performance is calculated, and safe work of the storage tank is guaranteed.

The invention discloses a fuel tank pressure sensor, and belongs to the technical field of automobile sensors, the fuel tank pressure sensor comprises a shell, a shell cover, a PCBA circuit unit and a ventilation unit, a monitoring channel is arranged in the shell, two sides of the monitoring channel are provided with communication connectors, the front end of the shell is provided with a wiring harness connector, the PCBA circuit unit is fixed in the shell, and the ventilation unit is fixed in the shell. The shell cover covers the outer shell, the ventilation unit is arranged on the shell cover, the PCBA circuit unit comprises a ceramic substrate and a circuit substrate with an electrical device, a detection hole communicated with a monitoring channel is formed in the outer shell, the ceramic substrate is bonded in the outer shell through a sealant, and the ventilation unit is arranged on the outer shell. The ceramic substrate is provided with a through hole corresponding to the detection hole, the circuit substrate is bonded above the ceramic substrate, and a monitoring chip is packaged in the circuit substrate. The device is high in reliability and low in manufacturing cost, and improves the accuracy and long-term stability of oil tank pressure detection.

The present disclosure relates to a method and device for optimizing navigation of a ship. The method according to an embodiment of the present disclosure may generate recommended navigation information about a navigation route of a ship, based on navigation plan information associated with a departure location and an arrival location of the ship, predict a boil-off gas (BOG) generation amount of the ship and a tank pressure value of the ship, based on the recommended navigation information, and obtain optimal navigation information associated with operation control of the ship, based on the BOG generation amount and the tank pressure value.

The application belongs to the technical field of shield construction, and discloses a method and system for early warning of settlement trend of shield construction crossing a dam; the method comprises the following steps: collecting silt layer geological data before the shield crosses the dam, and analyzing to obtain the distribution range and sensitivity level of the silt layer; collecting the tunneling parameters in real time in units of each ring when the shield machine crosses the silt layer section, and analyzing to obtain the disturbance index; collecting the real-time tunneling speed and the cutter head rotating speed, and recording the shutdown parameters when the complete shutdown condition is met; collecting the slurry tank pressure and the shutdown duration during shutdown, and calculating the pressure data; for the current sensitivity level, the preset hierarchical early warning rule is adopted, the current disturbance index basic threshold is corrected to obtain the corresponding dynamic threshold, the pressure data is compared with the dynamic threshold, and the early warning is issued according to the preset trigger logic classification; and the application improves the safety of shield construction crossing the dam.

The utility model discloses a kind of hot tank exhaust liquefaction structures, including condensate backflow member being fixed on hot tank, steam exhaust pipe being installed on condensate backflow member, condensate backflow member is provided with steam-liquid blending cavity, steam exhaust pipe is provided with the steam passage of intercommunication steam-liquid blending cavity, the inlet end of steam passage is communicated with the inner cavity of hot tank by steam-liquid blending cavity, steam-liquid blending cavity inner wall and steam exhaust pipe outer wall form condensate space, steam converges to form liquid in condensate space inner wall and is backflowed to hot tank by steam-liquid blending cavity. With the effect that hot tank can be effectively pressure-relieved, reduce steam exhaust amount when hot tank pressure-relieved.

The invention provides an oil return pipe mechanism and a compressor. The oil return pipe mechanism comprises an oil return pipe, a supporting column, a spring, an activation valve plate and a fixed valve plate, and the oil return pipe is communicated with an upper support oil pool, a lower support oil pool and a bottom oil pool. The activation valve plate can slide and is initially attached to the fixed valve plate under the elastic force of the spring; when the pressure of the oil pool rises to a set value, the oil pushes and activates the valve plate to overcome the resistance of the spring, a corresponding oil return channel is opened, and redundant oil is guided back to the oil pool at the bottom. The upper support oil return pipe is opened preferentially to maintain the pressure of the backpressure oil groove, and the lower support oil return pipe is opened to further relieve pressure when the rotating speed is increased, so that self-adaptive oil pressure adjustment under different working conditions is achieved, dynamic disc backpressure is stabilized, friction loss is reduced, and operation reliability is improved. The scroll compressor is reasonable in structural layout, low in machining precision requirement, high in oil return efficiency and suitable for scroll compressors with various rotating speed frequencies.

The invention relates to a low-temperature propellant temperature control method based on real-time pressure feedback of a storage tank on a rocket, which comprises the following steps of: acquiring a pressure value, a temperature value and flow of the storage tank in real time to determine whether the pressure value is within a set pressure range; the pressure value of the storage box is adjusted by executing control strategies such as adjusting the temperature set value, and the first set temperature is obtained; when the pressure value is within a set pressure range, determining an optimization target of the state prediction model, inputting the pressure value, the temperature value and the flow into the state prediction model, obtaining a target control variable and a second set temperature of the state prediction model when the optimization target is met, determining a target set temperature according to the first set temperature or the second set temperature, and performing state prediction according to the target set temperature. The target adjustment information including the target set temperature is obtained, and the temperature set value in the filling process is adjusted according to the target adjustment information, so that the low-temperature propellant is always in the optimal temperature state in the filling process, and the filling quality and efficiency are improved.

A closed fuel tank system (1) comprising: a fuel tank (10), a reservoir (20), a vapor channel (61H), a purge channel (62H), a shut-off valve (61), a purge valve (62), a tank pressure sensing unit (47), a lid flap actuating unit (41), a lid locking part (50A), a control unit (70), and a pre-fueling actuating unit (42). The lid locking part (50A) is designed to lock and unlock the lid flap (50) covering a fuel tank opening and unlocks the lid flap (50) when the lid flap actuating unit (42) is actuated by a user and the internal pressure of the fuel tank (10) is less than or equal to a predetermined pressure.The pre-fueling actuation unit (42) is designed to open the shut-off valve (61) to reduce the internal pressure of the fuel tank (10) to less than or equal to the specified pressure when it is actuated prior to actuating the lid flap actuation unit (42).

The application relates to the technical field of pressure detection, in particular to a LNG receiving station tank internal pressure detection system and a detection method, which comprises a pressure detection module and a gas storage tank, and the pressure detection module is arranged on the gas storage tank. The pressure detection module comprises a pipe, a sliding block and a sealing column, a sealing ring is arranged on the pipe, an installation plate is arranged on the pipe, a controller is arranged on the installation plate, and the controller is connected with a pressure gauge. A sliding groove A is arranged on the pipe. The sliding block is arranged in the pipe, two clamping blocks are symmetrically and elastically arranged in the sliding block, an outer thread pipe penetrates through the sliding block and is screw-connected with the sliding block, a driving piece for driving the outer thread pipe to rotate is arranged in the pipe. The sealing column is arranged on the inner side of the installation plate, the sealing column is located in the outer thread pipe, a pressure detection probe is detachably arranged on the inner side of the sealing column, and the pressure detection probe is connected with the controller. The application can realize effective and rapid disassembly, the pressure detection probe can be replaced conveniently and simply in the subsequent replacement, and gas leakage does not occur.

This application relates to a hydraulic brake cylinder pressure control system and its control method. The control system includes a pressure generation module and a pressure control module. The pressure generation module includes a check valve, an external accumulator, and an accumulator sensor. The check valve is connected to an oil tank. The pressure control module includes a proportional solenoid valve connected to the external accumulator and the brake cylinder; a pressure-holding solenoid valve located at the overflow port of the proportional solenoid valve, which is connected to the oil tank via the pressure-holding solenoid valve; a brake cylinder sensor collecting and outputting the brake cylinder pressure; and a brake cylinder pressure switch electrically connected to the brake cylinder sensor. During the relief condition, the proportional solenoid valve is de-energized and the pressure-holding solenoid valve is energized. During coasting or braking conditions, the proportional solenoid valve is energized, and the pressure-holding solenoid valve is de-energized after a delay. This application reduces the usage rate of the proportional solenoid valve and improves system reliability through the coordinated control of the proportional solenoid valve and the pressure-holding solenoid valve.

The invention relates to the technical field of tunnel engineering construction, and provides an in-hole advanced grouting construction method for a large shield to penetrate through a highway roadbed in a long distance, which comprises the following steps of: installing an advanced drilling machine on a shield tunneling machine, and rotating the advanced drilling machine to a specified drilling position; a drill rod of the advanced drilling machine is communicated with the shield advanced grouting pipe in a sealed mode; drilling is conducted through a drill rod of an advanced drilling machine, and when the drill hole reaches the preset depth, first mixed liquid is injected into the drill hole through the grouting pipe and the drill rod; after drilling is completed, retreating type double-slurry grouting is conducted through a grouting pipe, and in the grouting process, the pressure of a slurry bin of the shield tunneling machine is continuously monitored, and an advanced drilling machine drill rod and / or the shield tunneling machine are / is controlled to act till grouting is completed; and after grouting is completed, hole sealing is conducted through second mixed liquid. The water permeability of the stratum can be effectively reduced, a closed shell is formed on the inner wall of the tunnel, and the overall stability of the shield cutterhead side stratum is remarkably improved.

The utility model discloses a test device and a test system, and relates to the technical field of simulation test, the test device is used for an oil pressure sealing test of a fuse, the test device comprises an oil tank, a pressure control module, a temperature control module and a current control module, the oil tank is configured to be communicated with a gas source, and the oil tank is used for accommodating at least part of the fuse; the pressure control module is arranged between the air source and the oil tank and used for controlling the pressure in the oil tank. The temperature control module is arranged in the oil tank and used for controlling the temperature of insulating oil in the oil tank; the current control module is configured to be electrically connected with the power supply and form a current loop with the fuse to control the current passing through the fuse. According to the technical scheme, the pressure control module, the temperature control module and the current control module are arranged to correspondingly control the pressure, temperature and current conditions required in the oil pressure sealing test so as to meet the environment requirements of the oil pressure sealing test of the fuse, and therefore the use working conditions of the fuse under the national standard requirements are simulated.

2. Supply device for a hydraulic system (10), comprising at least a fluid supply with at least two supply pumps (20, 22), wherein at least one of the pumps (22) can be at least partially decoupled from the hydraulic system (10) depending on the volume flow requirement of the hydraulic system (10) by connecting this pump (22) to another pressure level which is lower than the pressure level of the hydraulic system (10), preferably tank pressure, wherein the decoupling of the pump (22) is carried out hydraulically via a switching valve (34) which has a main control stage (36) and a pilot stage (38) which generates a hydraulic control pressure as a signal during operation, which actuates the main control stage (36) and which has a predefinable switching hysteresis.

This application discloses a method, apparatus, equipment, and machine-readable storage medium for flash vapor control in liquefied natural gas (LNG) receiving terminals, relating to the field of LNG equipment technology. The method includes: obtaining the internal pressure value of the LNG storage tank under zero or low export conditions; adjusting the compressor load of the flash vapor pipeline to reduce flash vapor in the tank when the internal pressure value exceeds a preset lower limit; and performing a pressure-holding operation on the cold-insulating circulation pipeline based on the internal pressure value to further reduce flash vapor in the LNG storage tank. By combining the reduction of the internal tank pressure with the pressure-holding operation of the cold-insulating circulation pipeline, this method can significantly reduce the generation and emission of flash vapor, thereby improving the overall efficiency of the flash vapor treatment process.

The application discloses a kind of liquid seal breathing valve and method thereof, including the lower valve seat and upper insertion tube type valve cover of split arrangement;Lower valve seat is provided with the butt flange at lower end, and upper end is set to double sleeve structure;The upper end of double sleeve structure is open, including coaxially arranged inner sleeve, outer sleeve;Upper insertion tube type valve cover includes top cover and the insertion tube installed below top cover;Ball valve and pressure gauge are installed on top cover, and insertion tube is provided with several notches on the pipe wall close to lower end;Insertion tube is inserted between inner sleeve and outer sleeve, until the lower end of insertion tube is directly placed on lower valve seat, and the area surrounded by inner sleeve and outer sleeve is injected with sealing oil.It can be seen from this that the liquid seal breathing valve can realize the function failure of sealing liquid in extreme conditions, and when the upper limit of positive pressure fails to normally release pressure, the upper insertion tube type valve cover can be opened by positive pressure, so as to realize the purpose of releasing tank pressure, so that the liquid seal breathing valve has safety function.

The invention relates to the technical field of carrier rocket storage tanks, and discloses a carrier rocket storage tank liquid nitrogen hydraulic test system which comprises a common-bottom storage tank, an upper tank nitrogen pipeline, a lower tank nitrogen pipeline, an upper tank liquid nitrogen pipeline, a lower tank liquid nitrogen pipeline, an upper tank pressure difference pipeline, a lower tank pressure difference pipeline, a nitrogen cylinder group, a liquid nitrogen tank car and an automatic pressure relief pipeline. The pressure of the upper box and the lower box of the common-bottom storage box can be accurately controlled and dynamically adjusted, pressure difference control and redundancy safety measures are taken, the common-bottom storage box is mainly composed of the upper box, the lower box, a tunnel pipe, a common bottom and the like, an upper corrugated pipe is fixedly connected to the upper portion of the upper box, and the technical blank of automatic tests in the field is filled. The system can normally work at an extremely low temperature (liquid nitrogen-196 DEG C), accurately measures the hydraulic performance of the storage tank in a liquid nitrogen medium, provides powerful technical support for development of rocket storage tanks, has the advantages of simple structure, convenience in operation and accurate measurement, and can be widely applied to hydraulic tests of carrier rocket storage tanks.

This hydrogen-powered electric vehicle comprises an electric drive unit (11) for driving at least one drive wheel of the vehicle, at least one battery (13) for storing electrical energy, at least one fuel cell module (14), a hydrogen tank (15) for the fuel cell, and a hydrogen circuit (16) connected to the tank. The hydrogen circuit includes a high-pressure section (20) corresponding to the tank pressure. (See Figure 3 for abbreviations.)

According to the movable closed oil tank collecting and releasing device, a closed oil tank is placed on a trolley, the top of the closed oil tank is provided with a liquid inlet valve, a three-way valve and a pressure gauge, the bottom of the closed oil tank is provided with a blow-down valve, one side of the closed oil tank is provided with an inflating pump, and the other side of the closed oil tank is provided with a liquid level meter; the liquid inlet valve is connected with the on-site sewage discharge flow path through a hose quick connector, switches of the three-way valve and the sewage discharge valve are turned on, and dirty oil and water are conveyed into the closed oil collecting and releasing tank through flow path pressure; the blow-down valve is used for discharging oil dirt in the closed type oil collecting and releasing tank to an external sewage pool through hose quick connection; an air pipe of the inflating pump is connected with the three-way valve, the closed oil collecting and releasing tank is pressurized by opening the inflating pump, and viscous oil dirt in the tank body of the closed oil collecting and releasing tank is discharged to an external sewage pool through the blow-down valve by virtue of tank pressure. According to the utility model, the whole oil stain recovery and discharge process is automatic, the labor cost is saved, the pollution problem is effectively solved, oil and water are prevented from falling to the ground, and the working efficiency is improved.

The utility model relates to a liquid ammonia spherical tank pressure control device which comprises a pressure reducing pipeline and a pressure supplementing pipeline, the pressure supplementing pipeline comprises a pump inlet pipeline, a delivery pump, an ammonia removal heat exchanger pipeline and a pressure supplementing pipeline which are connected in sequence, a pump backflow pipeline is further connected between the discharging end of the delivery pump and the feeding end of the pump inlet pipeline in parallel, and a pressure supplementing pipeline is further connected between the delivery pump and the feeding end of the pressure supplementing pipeline. The ammonia removal heat exchanger pipeline is also connected with a downstream removal pipeline; a control valve I is arranged at the feeding end of the downstream removal pipeline; the pressure reduction pipeline comprises a pressure reduction feeding pipeline, a control valve II, a one-way valve I, a gas-liquid separator, an ammonia refrigerator unit and a low-temperature liquid ammonia storage tank removal pipeline which are connected in sequence; when the pressure in the liquid ammonia spherical tank is low, the storage pressure in the liquid ammonia spherical tank can be increased through the pressure supplementing pipeline, that is, materials in the liquid ammonia spherical tank are heated through the steam heat exchanger, liquid-phase materials are heated and converted into gas-phase materials, and the gas-phase materials return to the spherical tank, so that the pressurization effect is achieved.

This invention discloses a method for cooling and depressurizing a large LNG storage tank after long-term quiescence, relating to the field of LNG storage tank technology. The method includes the following steps: filling detection, valve detection, spray control, pressure display, pipeline control, temperature and pressure detection, and valve closure. Before resuming LNG transport, this invention uses a pre-cooling pipeline and spray device to pre-cool the LNG storage tank, reducing the temperature and pressure of the top gas phase space. In the early stages of spraying, the pressure of the LNG storage tank tends to decrease. When the tank pressure drops to a certain value, the vaporization of the LNG entering the tank causes the pressure to rise. Before the LNG tank pressure begins to rise, a BOG compressor needs to be started to extract BOG gas from the LNG storage tank. At this time, the pressure of the LNG storage tank is low, and the temperature of the top gas is reduced, thereby achieving control of the tank pressure before resuming transport after a long period of quiescence, and reducing the time required to start the BOG compressor and the amount of BOG gas flare.

The goal is to stabilize the fuel supply to the engine while ensuring the fuel pump operates efficiently. [Solution] The aircraft fuel supply system comprises a fuel pump and an intermediate tank fluidly connected to the engine via a fuel supply passage, a pressure sensor that detects the internal pressure of the intermediate tank or a tank pressure correlated with the internal pressure of the intermediate tank, and a processing circuit that performs intermittent control to control the pump actuator according to the tank pressure. The intermittent control includes controlling the pump actuator to stop the fuel pump when the tank pressure increases and reaches a first threshold, while allowing fuel to be supplied from the intermediate tank to the engine, and controlling the pump actuator to drive the fuel pump when the tank pressure decreases and reaches a second threshold smaller than the first threshold.

This invention relates to the field of dust treatment technology, and discloses a method and apparatus for dust treatment in powder coating production. The method includes: calculating a filter cartridge state coefficient based on the pressure difference inside and outside the filter cartridge and the residual pressure difference after dust removal; calculating a dust load coefficient based on the inlet gas temperature, dust concentration, and humidity of the dust-laden gas; calculating a dust removal capacity matching coefficient based on the pulse valve blowing pressure and air tank pressure recovery time under the current filter cartridge state coefficient and dust load coefficient; calculating a safety risk coefficient based on the instantaneous peak emission concentration and the outlet carbon monoxide concentration; and calculating a target pulse dust removal interval time based on the safety risk coefficient and the dust removal capacity matching coefficient, and adjusting the current pulse dust removal interval time to the target pulse dust removal interval time. This invention achieves dynamic optimization of the dust removal interval through multi-coefficient fusion, taking into account the dust removal effect, operating energy consumption, and safety risks, and significantly improving the intelligence level and operational stability of the dust removal system.