23808 results about "Gas supply" patented technology

The invention relates to the technical field of sewage treatment, in particular to a liftable aeration device and a sewage treatment system.The system comprises a data acquisition module for acquiring dissolved oxygen concentration, gas flow and air pressure at multiple moments before each moment in the sewage treatment process and recording the dissolved oxygen concentration, the gas flow and the air pressure as historical data sets of each moment; the feature analysis module is used for determining the gas supply stability at each moment; determining a first trend degree, a second trend degree, a first collaborative factor and a second collaborative factor of each fluctuation moment in the historical data set of each moment; determining a relative collaboration degree and a forward feedback index at each moment; the aeration control module is used for determining a proportionality coefficient and an integral parameter of a PID controller at each moment; and in combination with a PID (Proportion Integration Differentiation) controller, obtaining a gas flow control value at each moment, and controlling the concentration of the dissolved oxygen in the sewage. The gas flow can be more accurately adjusted, the control accuracy of the concentration of dissolved oxygen in sewage is improved, and the sewage treatment efficiency is improved.

A system for dehydration of organic material comprises a housing structure having an interior chamber, a supply duct, a dual trunk structure, a dry air intake, a central recirculation duct, and a plurality of side recirculation ducts. The side recirculation ducts each have a return plenum extending downward from a top recirculation duct and are configured to recirculate interior air contained in the chamber. The interior air enters the side recirculation ducts through the return plenums and is pushed upward and outward through the top recirculation ducts and back into the interior chamber. The interior chamber has a plurality of exhaust vents positioned in the upper region of its walls. A plurality of portable platforms positioned inside the interior chamber are configured to hold the organic material. The floor of the housing structure can include a plurality of tracks for loading, unloading and positioning the portable platforms.

The invention provides a supercritical CO2 fracturing, displacement and storage integrated experimental device and method, belongs to the technical field of natural gas development, and is used for solving the problem that a real-time and multidirectional monitoring and evaluation experimental device for simulating a deep unconventional natural gas exploitation process is lacked. The supercritical CO2 fracturing, displacement and sealing integrated experimental device comprises an accommodating cavity, a ground stress simulation system, a gas source supply system, a fracturing fluid preparation system, a temperature control system, a tail gas recovery system, a multi-parameter monitoring system and a displacement effect evaluation system, and can systematically simulate true triaxial ground stress and ground temperature conditions; fracturing, displacement and sequestration experiments of supercritical carbon dioxide on a rock sample are carried out, multi-azimuth and multi-parameter real-time monitoring and quantitative characterization evaluation are carried out on experimental results in the experimental process, and important theoretical research and actual production guiding significance is achieved for development of deep unconventional natural gas and geological sequestration of carbon dioxide.

The invention relates to an air bag type mechanical sealing structure and a sealing method thereof in the technical field of LNG ships, the air bag type mechanical sealing structure comprises an annular air bag sealing ring, an air supply system room floor enclosure bulkhead and a liquid tank top drooping wall, and annular flexible sealing lips are fixedly arranged at the top and the bottom of the annular air bag sealing ring; hard sealing rings are fixedly arranged at the bottom of the air supply system room floor enclosure bulkhead and the top of the liquid tank top drooping wall correspondingly, and the hard sealing rings and the flexible sealing lips are connected in a matched mode. The movable gap formed by the top of the liquid tank and the air supply system can be fully sealed, the technical requirements of deformation of the top of the liquid tank and relative deformation and movement between peripheral ship deck components under the conditions of ship navigation, severe sea conditions, temperature difference and the like are met, and the technical requirement for sealing of the top of the liquid tank and an air supply system chamber is also met; the risk of ultralow-temperature gas leakage is avoided, closed-loop management of monitoring, analysis, compensation and alarm is achieved, and system safety and maintenance efficiency are improved.

The present invention relates to the technical field of waste heat recovery equipment, and specifically discloses a waste heat recovery device for flue gas in a thermal power plant. It includes a box body with an upper smoke chamber, a heat exchange chamber and a lower smoke chamber inside. A number of smoke pipes connecting the upper smoke chamber and the lower smoke chamber are fixed in the heat exchange chamber; above the smoke pipes, there is a piston cylinder fixed by the box body; the upper end of the piston cylinder is connected to a high-pressure gas supply pipe, and a piston is arranged inside. The piston is connected with a scraping head through a push rod; side holes are provided on the push rod; when the high-pressure gas drives the piston to move downward, the scraping head moves along the inner wall of the smoke pipe to scrape off the ash slag. The waste heat recovery device for flue gas in this thermal power plant has a cleaning function and a better cleaning effect, high heat exchange efficiency and good waste heat recovery effect. The waste heat recovery device for flue gas in this thermal power plant can be automatically cleaned without disassembling components, is fast and efficient, and can be operated online. The ash slag scraped off during the cleaning process can be centrally recovered, avoiding re-mixing into the flue gas again, reducing the workload in the flue gas dust treatment link, and saving the subsequent environmental protection treatment cost.

The embodiment of the invention provides an air supply system and an air supply method of an air suspension. The air supply system of the air suspension comprises an air storage tank, a plurality of air springs, an air supply valve body unit, a dryer, a heating element, an electronic control unit and a humidity sensor. The air storage tank is used for storing compressed air; the air spring is used for inputting high-pressure gas to each wheel of the vehicle; the air supply valve body unit comprises a reversing valve; the reversing valve is arranged on an air channel, so that the air supply system is driven to be switched between the air suction mode and the reverse blowing mode through reversing of the reversing valve; the cavity of the dryer is communicated with the air supply valve body unit through an air channel; the heating element is arranged in a cavity of the dryer, the humidity sensor is arranged on the air channel, and the humidity sensor corresponds to the electronic control unit in a signal mode. Therefore, the air supply system of the air suspension has the advantage that the regeneration efficiency of the dryer is improved.

The invention discloses a digital twinning method and device for energy loss and dynamic response of a steam pipe network and a computer program product, and the method comprises the following steps: S1, constructing a pipe network model according to the structural parameters of the steam pipe network; s2, acquiring current steam pipe network measuring point data, wherein the steam pipe network measuring point data comprises pressure and temperature of a gas supply end and mass flow of a user end; s3, parameters including the enthalpy value and the pressure difference of steam are obtained according to an IAPWS-IF97 formula; s4, the steam operation pressure and the specific enthalpy of adjacent nodes are solved according to node distribution of the steam pipe network; s5, the flow between the nodes is obtained according to the obtained pressure and specific enthalpy of the adjacent nodes; and S6, solving parameters of other nodes by analogy to obtain temperature and pressure of all nodes and flow parameters among the nodes. Through field experiment verification, the result shows that the method can effectively improve the calculation precision of the steam quality of the steam pipe network node, and is suitable for simulation research of most steam pipe networks under different working conditions.

The air supply type jet aerator comprises a water inlet pipe, one end of the water inlet pipe is connected with an air inlet unit through a first connecting pipe, and the end, away from the first connecting pipe, of the air inlet unit is connected with a second-stage mixing pipe through a second connecting pipe; the end, away from the second connecting pipe, of the second-stage mixing pipe is connected with a third-stage mixing pipe through a third connecting pipe, the end, away from the third connecting pipe, of the third-stage mixing pipe is connected with a spray head through a fourth connecting pipe, the inner wall of the water inlet pipe is connected with a loop assembly, and the inner wall of the second-stage mixing pipe is connected with a contraction unit. And the inner wall of the third-stage mixing pipe is connected with a turnover crushing mechanism. The invention also discloses a jet aeration method of the air supply type jet aerator with porous air inlet and compression circulation. The air supply type jet aerator solves the problem that the existing air supply type jet aerator is easy to cause sludge bulking.

The invention discloses a gas air source heat pump heat supply cost optimization method based on climate compensation, and relates to the technical field of heat supply cost optimizing.The method comprises the following steps that S1, the outdoor temperature of a heat supply area and the indoor temperature of the interior of a building in the heat supply area are collected; s2, the thermal load capacity of the building for maintaining the specified indoor temperature under different outdoor temperature conditions is analyzed; s3, unit parameters of the gas air source heat pump are obtained, and a unit efficiency model is established; s4, a climate compensation rule is formulated, and target temperatures needing to be maintained by various types of buildings under the future outdoor temperature condition are matched; and S5, on the basis of the unit efficiency model and the heat supply amount, optimizing the supply task, and analyzing the future gas supply amount in the heat supply area. By dynamically adjusting the parameters of the heat supply system and optimizing the heat supply strategy, the utilization efficiency of the unit is improved to the maximum extent, so that the flexibility and response speed of the heat supply system are improved, the heat supply cost is reduced, and the comfort level of a user is improved.

Embodiments of the present disclosure provide a method, an Internet of Things (IoT) system, and a medium for pipeline repair based on smart gas. The method is executed based on a government supervision and management platform of the IoT system for pipeline repair based on smart gas. The method includes: obtaining pipeline repair equipment information and pipeline data to be repaired; determining a pipeline repair sequence based on the pipeline repair equipment information and the pipeline data to be repaired; based on the repair commands, performing at least one of the following operations: receiving feedback information; determining an updated collection frequency for a pressure regulating equipment and a gas metering device deployed on a target gas pipeline based on the feedback information; and generating a repair update command based on the pipeline data to be repaired, a pressure regulating parameter, a gas supply parameter, and a monitoring data.

The invention discloses a multi-stage gas inlet type hydrogen catalytic combustion system and method, and the system comprises a hydrogen supply part, an air supply part, a mixed gas pressure detection part, a mixed gas humidity detection part, a mixed gas hydrogen concentration detection part, a hydrogen catalytic combustion reactor, a branch gas supply part and a post-reaction hydrogen concentration detection part, the air supply component and the hydrogen supply component are connected in parallel and then connected to the hydrogen catalytic combustion reactor through a mixing pipeline, the hydrogen catalytic combustion reactor comprises multiple stages of catalytic reaction cavities which are sequentially distributed from the head end to the tail end, and each catalytic reaction cavity is connected with a branch air supply component. The branch gas supply components are further connected to the hydrogen supply component through branch pipelines, the gas inlet amount of each branch gas supply component is adjustable, the mixing pipeline is communicated with the branch gas supply components through branch connecting pipelines, and a mixed gas pressure detection component, a mixed gas humidity detection component and a mixed gas hydrogen concentration detection component are arranged on the mixing pipeline.

The invention discloses an optimal scheduling method for a multi-energy complementary virtual power plant, and the method comprises the following steps: building an objective function of an optimal scheduling model of the multi-energy complementary virtual power plant, the objective function comprising two optimization objectives of economic optimization and carbon emission optimization; establishing constraint conditions of the multi-energy complementary virtual power plant optimization scheduling model, wherein the constraint conditions comprise power supply system balance, gas supply system constraint, heat supply system constraint, heat supply network constraint and cold supply system constraint; based on the objective function and the constraint condition, a two-stage robust optimization model of the multi-energy complementary virtual power plant is constructed, and two types of adjustment resources of distributed energy storage and demand response load are introduced into the two-stage robust optimization model; and for the two-stage robust optimization model of the multi-energy complementary virtual power plant, an original problem is decomposed and iterative solution is carried out by using a column and constraint generation algorithm, and an optimal scheduling strategy for the multi-energy complementary virtual power plant is obtained. According to the invention, the power grid can be flexibly regulated and controlled by optimizing the scheduling strategy.

The utility model belongs to the technical field of pipelines, and particularly relates to an anti-leakage detection device for a municipal road drainage pipeline, which comprises a body, sealing structures are symmetrically arranged on two sides of the body, and the sealing structures can be attached to the inner wall of a drainage pipe; the driving wheel is arranged below the body and is used for driving the device to move in the drainage pipe; the air supply assemblies are arranged on the two sides of the body and used for sealing air pressure between the structures; the auxiliary structures are uniformly distributed at the outer end of the sealing structure in the circumferential direction and are symmetrically arranged front and back; wherein an air pressure sensor is arranged on the body and used for detecting the air pressure between the sealing structures when the device works. The effects of improving the detection accuracy and avoiding the missing detection phenomenon are achieved.

The invention relates to the technical field of intelligent control, in particular to a wall-hanging stove constant-temperature energy-saving control system based on enhanced autonomous learning and an SAC algorithm, and the system comprises a gas flow optimization module which collects heating operation data of a wall-hanging stove, classifies the heating operation data according to the change characteristics of a plurality of events, calculates the frequency of occurrence of each event, and outputs the frequency of occurrence of each event; and analyzing the change condition of the operation data according to the event occurrence frequency, and generating a gas flow data set. According to the method, the gas flow data is generated through real-time collection and multi-dimensional classification analysis of the operation data of the wall-hanging stove in combination with the event triggering characteristics, and accurate data support is provided for follow-up heat supply demand prediction and combustion control. And the opening degree of the combustion valve and the gas supply pressure are dynamically adjusted through the enhanced autonomous learning algorithm, dynamic adaptation of the gas flow and the heating requirement is achieved, and the gas utilization efficiency is remarkably improved. And dynamic division and adjustment of a heat exchange area are combined, so that the distribution characteristic of a heat flow path is optimized.

The invention discloses a deep fusion air pressure intelligent optimization control method and system. The method comprises the steps that the air load of a user side is obtained; calculating plan parameters of the air compressor by adopting a feed-forward intelligent control strategy based on the air load; calculating target parameters of the air compressor by adopting a PLC feedback control strategy based on the planned parameters of the air compressor and the real-time pressure of the system; the air compressor plan parameters comprise the opening number of the air compressors, the opening degree of an inlet adjusting valve, the closing degree of an emptying adjusting valve and the operation frequency; the target parameters of the air compressor comprise the opening number, the operation frequency and the opening degree of an inlet adjusting valve of the air compressor; accurate control and adjustment of the operation process of the air compression system are achieved, the problems that due to manual control, the output pressure fluctuation of the air compression system is large, stable operation of the system cannot be guaranteed, and the energy consumption and the air supply cost of the air compression system are high are solved, energy efficiency fluctuation is accurately analyzed, potential energy consumption problems are predicted, and the energy efficiency of the air compression system is improved. The overall operation efficiency is improved, and the optimal energy efficiency is achieved.

The invention relates to a membrane stack (9) for an air humidifier (1) of a fuel cell for humidifying a dry supply air stream (2) of the fuel cell by means of a moist exhaust air stream (3) of the fuel cell, - wherein the membrane stack (9) is configured in a cuboid shape, has a stacking direction (S) and four stacking sides (10) perpendicular to the stacking direction (S), - wherein the membrane stack (9) has a vertical direction (Z) parallel to the stacking direction (S), a longitudinal direction (X) perpendicular to the vertical direction (Z) and a transverse direction (Y) perpendicular to the vertical direction (Z) and perpendicular to the longitudinal direction (X), - wherein the four stack sides (10) form an air supply inlet (ZE) and an air supply outlet (ZA) facing away from each other in the longitudinal direction (X), and an exhaust air inlet (AE) and an exhaust air outlet (AA) facing away from each other in the transverse direction (Y), - wherein the membrane stack (9) comprises several membranes (11) which are permeable to moisture and impermeable to air and which follow one another in the stacking direction (S) such that the membranes (11) within the membrane stack (9) each separate a supply air path (ZP) connecting the supply air inlet (ZE) to the supply air outlet (ZA) from an exhaust air path (AP) connecting the exhaust air inlet (AE) to the exhaust air outlet (AA). Improved functional reliability can be achieved by having the membrane stack (9) have several spacers (12) which are arranged in the stacking direction (S) between two immediately successive membranes (11) in one of the exhaust air paths (AP).

Provided is a small, simple hydrogen gas production device that allows gas produced in sequence using liquefied ammonia as a raw material to flow downstream without stagnation, does not require a separate pressure reducer for creating a pressure difference between the upstream and downstream sides of a separation membrane, and can remove nitrogen without using a high-pressure compressor, thereby consuming less power. [Solution] The hydrogen gas production device of the embodiment includes a tank of liquefied ammonia, a primary purification section and a secondary purification section that remove residual ammonia gas and nitrogen gas from decomposition gas of ammonia gas, and a pressure reducer. The separation membrane of the purification section from which nitrogen gas is removed separates hydrogen gas from nitrogen gas by the differential pressure between the upstream and downstream sides of the separation membrane. The pressure reducer is provided in a purified gas line through which hydrogen gas flows, and reduces the pressure on the upstream side of the pressure reducer. The differential pressure is formed as a part of the pressure difference formed between the tank internal pressure and the pressure on the upstream side of the pressure reducer.

The invention relates to the field of aero-engine bearing cavity structure system testing, and particularly provides an aero-engine bearing cavity inner lubricating oil flow state measuring system which comprises a test piece main body simulating an aero-engine bearing cavity, an oil gas supply and recovery system and a control system. The test piece main body comprises a rotor test piece and a stator test piece which are connected together, and the oil gas supply and recovery system comprises an oil supply system, a gas supply system, an oil return pool and an oil gas separation pump. The control system comprises a controller, and an oil supply throttle valve, an air supply throttle valve, an exhaust throttle valve, a test data acquisition assembly and a test piece main body driving device which are in signal connection with the controller. On the basis of the method, the lubricating oil-air flowing state in the bearing cavity can be monitored and evaluated in real time, and test support can be provided for follow-up bearing cavity optimization design.

The invention relates to the technical field of optics, in particular to a gas concentration regulation and control interference imaging system applied to shape righting of a nozzle handle, a shape righting tool and a nozzle are prepared, the shape righting tool is provided with a downward pressing mechanism, the downward pressing mechanism is provided with a downward pressing telescopic column for correcting the nozzle handle, and a displacement measurement interferometer system is assembled on the shape righting tool; the displacement measurement interferometer system is provided with a reflecting movable mirror and a beam splitter, and the reflecting movable mirror is mounted on the pressing telescopic column; the displacement measurement interferometer system further comprises an interference light path stroke difference fine tuning system. The interference light path stroke difference fine adjustment system comprises a glass container for containing sulfur hexafluoride, the end faces of the two ends of the glass container are flat and transparent, the glass container is arranged on a light path between the beam splitter and the reflective moving mirror, and the end faces of the two ends of the glass container are perpendicular to laser on the light path; the glass container is provided with an air supply port; the air supply port is connected to an air pump, and the air pump is connected with a sulfur hexafluoride air source. And the shape correcting position of the nozzle handle is accurately controlled.

The invention relates to a starting time sequence control method and device for an ion electric propulsion system. According to the neutralizer ignition control time sequence, the main cathode ignition control time sequence and the discharge chamber arcing control time sequence, neutralizer arcing, main cathode arcing and discharge chamber arcing controlled by the ion electric propulsion system starting time sequence are carried out; after arc starting of the discharge chamber succeeds, beam extraction of ion electric propulsion system starting time sequence control is carried out according to the beam extraction control time sequence; and after the beam current is successfully led out, power supply out-of-tolerance judgment for starting time sequence control of the ion electric propulsion system is carried out, and if the power supply out-of-tolerance judgment passes, the ion electric propulsion system is successfully started. According to the invention, on the premise of ensuring normal starting of the ion electric propulsion system, optimization of the ignition time sequence of the thruster is realized; the purposes that the neutralizer starts arcing preferentially, the ignition time of the main cathode is shortest, the gas supply balance time of the anode is shortest, the discharge chamber starts arcing stably, the length and width range of the ignition starting time of the thruster is adjustable, and the whole starting time sequence has high robustness control are achieved.

The invention relates to the technical field of aircraft heat dissipation, in particular to an airborne hybrid refrigeration system, an aircraft and a control method. The airborne hybrid refrigeration system comprises a power assembly, a motor assembly, an air circulation assembly and a liquid cooling circulation assembly. The motor, the gas compressor and the gas turbine are coaxially connected. The air circulation assembly includes a cooling turbine, a first heat exchanger, and a first water separator. The gas compressor, the cooling turbine and the first water segregator are sequentially communicated to form a gas supply path. An outlet of the cooling turbine communicates with an inlet of the first heat exchanger to form a refrigeration air path. In the liquid cooling circulation assembly, the liquid cooling pump, the heat load heat exchanger, the first isolation pipeline and the second isolation pipeline are communicated to form a liquid cooling loop. The evaporator and the first isolation pipeline are connected in parallel, and the first heat exchanger and the second isolation pipeline are connected in parallel. The aircraft comprises the airborne hybrid refrigeration system, and the control method is applied to the aircraft, so that the problems of design redundancy and high energy consumption of the airborne hybrid refrigeration system are solved.

The invention relates to the technical field of automobile air suspensions, and discloses an air suspension system and a vehicle, and the air suspension system comprises a mechanical module and an electronic central control module. The mechanical module comprises a valve body, an air path, an air supply unit, a pressure sensor and a drying chamber assembly, the air supply unit is connected with the valve body through the air path, and the valve body is provided with various valves and is connected with the filtering chamber assembly. The electronic central control module comprises a central control upper cover, a central control base, a central control PCBA circuit board and a switching electromagnetic valve coil. An electromagnetic valve driving circuit on the circuit board is used for controlling opening and closing of an electromagnetic valve. Air compressed and filtered by the air supply unit enters the valve body through the drying cavity assembly, and then the switching electromagnetic valve set is controlled by the electronic central control module to conduct air supply switching. The system is further provided with an inflation pump, an inflation motor, a plurality of sets of switching electromagnetic valves and an air electromagnetic valve which are used for controlling air supply and air exhaust of different air paths. According to the system, efficient and safe operation of the air suspension is achieved through air path design and electronic control.

The invention relates to the technical field of aero-engines, in particular to a sealing and cooling structure and method for adjusting the axial force of an aero-engine rotor, which comprises a turbine disc provided with a rear baffle, and further comprises a low-pressure turbine guide vane arranged opposite to the turbine disc, a low guide front inner supporting ring and a low guide rear inner supporting ring are arranged in the middle of the low-pressure turbine guide vane; labyrinth teeth correspondingly matched with the low-guide front inner supporting plate are formed on the rear baffle, radial labyrinth tooth gaps are formed, and when airflow in an air collection cavity enters a rotor cavity from a low-pressure pre-rotation nozzle, the airflow is embedded into an air supply channel from a front pre-rotation hole at the same time; one part of airflow entering the air supply channel enters the disc rear cavity, and the other part of airflow enters the rotor cavity. By adjusting the sealing labyrinth structure, it is ensured that the axial force of the rotor does not exceed the allowable maximum value in the large-state working process and is not subjected to light load in the small-state working process, meanwhile, sealing gas used behind a turbine disc is ensured, turbine hot gas is prevented from flowing into an inner disc cavity from a main channel, and it is ensured that an engine works reliably.

A system that includes a gas generator coupled to a gas supply and configured to generate alternating current (AC) electricity and a receptacle coupled to the gas generator and configured to receive AC electricity from the gas generator. The system also includes an interlock switch coupled to the receptacle and configured to switch to gas generator power when a power outage occurs. Further, the system includes an electrical panel coupled to the interlock switch, the electrical panel including at least one circuit breaker. Further still, the system includes an air conditioning unit, the air conditioning unit including a current reducer configured to reduce the transient current draw encountered during startup of a compressor of the air conditioning unit.

The invention discloses an organic waste gas purification treatment device, which comprises an adsorption purification structure and an auxiliary adjustment structure, the adsorption purification structure is a tank body, the upper part in the adsorption purification structure is connected with an activated carbon filter layer through a bolt, and steam moving sheets are arranged in steam hoods on the upper and lower ring surfaces of the adsorption purification structure and are connected with a steam main pipe and a steam auxiliary pipe through pressure relief conduits; the auxiliary adjusting structure is arranged on the left side of the adsorption purification structure and communicated with the lower end, a cavity dividing plate, a supporting frame body and other components are arranged in the organic waste gas pipe body, and a hydraulic pipe on the supporting frame body is connected with a high-concentration blocking net plate and connected with a gas supply pipe and a water supply pipe through a series of mechanical transmission; when the device is used, low-concentration organic waste gas can be directly purified; when high-concentration and high-temperature organic waste gas is treated, the waste gas and supplementary gas can be mixed, cooled and concentrated, so that the waste gas and supplementary gas meet activated carbon adsorption conditions, and meanwhile, steam can be utilized to push the steam movable sheet to construct a closed environment, so that organic matters adsorbed by activated carbon are quickly desorbed and output and recovered along with the steam.

The invention discloses a gas injection device and horizontal flow vapor deposition equipment. The gas injection device comprises a top plate; the supporting sleeve body is arranged at the bottom of the top plate, and partial side wall is exposed; the top heat uniformizing mechanism surrounds the exposed side wall of the supporting sleeve body and is located on the side where the bottom of the top plate is located. The bottom of the first rotary sealing assembly is arranged at the top of the top plate in a dynamic sealing mode, and the first rotary sealing assembly is connected with the supporting sleeve body so as to drive the top heat uniformizing mechanism to rotate; the bottom of the second rotary sealing assembly is arranged at the top of the first rotary sealing assembly; and the gas inlet device penetrates through the supporting sleeve body and the first rotary sealing assembly, is arranged on the second rotary sealing assembly, is used for providing process gas into the process chamber and rotates relative to the supporting sleeve body under the driving of the second rotary sealing assembly, and is beneficial to the temperature uniformity and gas concentration uniformity of the surface of the substrate.

The invention provides silicon carbide epitaxial growth equipment and a silicon carbide epitaxial growth method. According to the growth equipment, a gas supply system comprises a first flow control module and a second flow control module which are respectively connected with a control module; the epitaxial growth module comprises a shell, the top of the shell is provided with a spraying device, the spraying device comprises a first gas supply area and a second gas supply area surrounding the first gas supply area, the first gas supply area and the second gas supply area respectively comprise a plurality of ventilation holes, and the first gas supply area and the second gas supply area are respectively connected to a gas supply system through pipelines. Based on the first flow control module and the second flow control module, the gas amount / or the carbon-silicon ratio of the matched and corresponding first gas supply area / second gas supply area is controlled, and the bottom side in the shell is provided with a bearing disc which is used for placing a substrate and is arranged opposite to the spraying device. The spraying device is partitioned, and the amount of gas introduced into the air holes of each region can be controlled to improve the N doping concentration uniformity of the epitaxial layer of epitaxial growth of silicon carbide.

A mine cooling and dehumidifying system includes a compressor, a gas-liquid separator, an evaporator, a condenser and an expansion valve. The evaporator is in an air supply well, and the condenser is in a return air well; the compressor, the gas-liquid separator and the expansion valve are all between the air supply well and the return air well; an inlet of the compressor is connected to a refrigerant outlet of the evaporator through the gas-liquid separator, and a refrigerant inlet of the evaporator is connected with an outlet of the expansion valve; an inlet of the expansion valve is connected with a refrigerant outlet of the condenser, and a refrigerant inlet of the condenser is connected with an outlet of the compressor. In the present disclosure, by vapor compression type refrigeration cycle, the downhole air heat is transferred to the return air and then discharged to the ground.

The dryer comprises a dryer shell, an inner cavity of the dryer shell is divided into a drying agent cavity and a heating module wiring cavity which are independent of each other through an end face structure, a heating module barrel sleeve is arranged on the end face structure in a penetrating mode, and the two ends of the heating module barrel sleeve stretch into the two independent cavities respectively. Two air tap connectors communicated with the drying agent cavity are arranged on the outer wall of the dryer shell at intervals, a drying agent drying assembly is arranged between the outer wall, located between the two air tap connectors, of the heating module barrel sleeve and the inner wall of the dryer shell, and a heating body assembly is arranged in the heating module barrel sleeve. A connector assembly is arranged on the outer wall of the dryer shell and used for being connected with an external power source, and the heating body assembly is electrically connected with the connector assembly. According to the invention, related connector design is simplified, product cost is reduced, airtightness failure caused by structural deformation after long-term work of the plastic assembly is avoided, high-efficiency and low-loss heating control can be realized, and system arrangement is more flexible.

The invention provides a multi-dimensional fuel gas alarm system for a workshop production line, and relates to the technical field of fuel gas alarm. The multi-dimensional fuel gas alarm system for the workshop production line comprises a fuel gas sensor module, a positioning module, a valve cut-off module, a data acquisition module, a data processing module, an alarm module and a standby power supply module, the gas sensor module comprises a gas sensor installation unit, a sensor node unit, a wireless communication module and a threshold setting unit. According to different levels of gas concentrations, alarms (early warning, alarm and emergency alarm) of different levels are triggered, and corresponding countermeasures are taken, so that when a gas leakage event occurs, gas supply can be quickly cut off, gas accumulation and potential safety hazards are reduced, and after an alarm signal is sent out, a related person in charge is immediately notified, so that the safety of gas leakage is ensured. And timely response is ensured through various modes of short messages, calls and WeChat, so that potential risks and loss are reduced to the greatest extent.