498 results about "Intermediate pressure" patented technology

The utility model relates to the technical field of steam turbines, and discloses a thermodynamic system of a coupling back pressure turbine for wide-load peak regulation, which is provided with a boiler, a back pressure turbine, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a generator and a recovery mechanism, the boiler is respectively connected with the back pressure machine, the high-pressure cylinder and the intermediate-pressure cylinder; the back pressure machine is connected with the high-pressure cylinder; the medium-pressure cylinder is connected with the low-pressure cylinder; the low-pressure cylinder is connected with the generator; the recycling mechanism is connected with the low-pressure cylinder and the boiler and used for condensing steam discharged by the low-pressure cylinder and recycling and conveying the steam to the boiler. In a high-load operation state, the thermodynamic system, the back pressure turbine and the high-pressure cylinder operate in parallel, and the boiler conveys steam to the back pressure turbine and the high-pressure cylinder. In the thermodynamic system in a low-load operation state, the back pressure machine and the high-pressure cylinder are connected in series for operation, the boiler conveys steam to the back pressure machine, and the back pressure machine conveys steam to the high-pressure cylinder. According to the utility model, the pressure of steam entering the steam turbine during low-load operation can be improved, and the feed water temperature and the operation economy can be improved.

The embodiment of the invention provides a multi-steam-source cooperative frequency modulation combined heat and power generation system and a control method. The system comprises a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a power generator, a multi-stage regenerative heater, a heating system and a heating steam supply pipeline. A main steam outlet of the boiler is connected to the high-pressure cylinder through a main steam pipeline, a steam exhaust port of the high-pressure cylinder is connected to the intermediate-pressure cylinder through a pipeline, a steam exhaust port of the intermediate-pressure cylinder is connected to the low-pressure cylinder through a pipeline, and a steam exhaust port of the low-pressure cylinder is connected to the generator through a pipeline. A condensate water outlet of the medium-pressure cylinder is communicated to a condensate water inlet of the boiler through a first condensate water pipeline; the heating system is communicated with a steam exhaust port of the medium-pressure cylinder through a heating steam supply pipeline; the multi-stage regenerative heater is arranged on the first condensate water pipeline and connected with the high-pressure cylinder and / or the intermediate-pressure cylinder through steam extraction pipelines, and steam extraction adjusting valves are correspondingly arranged on the steam extraction pipeline between the high-pressure cylinder and the multi-stage regenerative heater and / or the steam extraction pipeline between the intermediate-pressure cylinder and the multi-stage regenerative heater.

The invention discloses a vibration-CO2 corrosion coupling effect real-time monitoring system and monitoring method for a well cementation cement sheath of an oil and gas well in a high-temperature and high-pressure environment. The system comprises a kettle system which is fixed with a base of an axial loading system, and a push rod of the axial loading system extends into the kettle system from the center of a kettle cover and is pressed on a detected body; the CT detection system is mounted below a jack supporting plate of the axial loading system; the electrolytic corrosion system is connected with the lower end of a first embedded axial pipeline on the side wall of a kettle body in the kettle system so as to apply an experimental environment; the gas pressurization system is divided into two paths, one path is led into the kettle system from the lower part, and the other path is connected with the lower end of the second embedded axial pipeline; a sleeve of the kettle system is fixed in the kettle system, the nondestructive testing system is installed in the middle of the sleeve, and the vibration system in the sleeve is installed on the lower portion of the sleeve. According to the invention, axial loading, gas pressurization and heating devices are integrated, and an underground high-temperature and high-pressure environment is simulated; and CT and ultrasonic waves cooperate to realize multi-dimensional dynamic monitoring of the corrosion process.

A compressor includes a housing, a first compression mechanism and a second compression mechanism disposed in the housing, and a housing cover fixed to the housing. Both the first compression mechanism and the second compression mechanism are configured to compress a working fluid from a suction pressure to a discharge pressure. The first compression mechanism includes a first cylinder housing having a first fluid storage plenum. The second compression mechanism includes a second cylinder housing having a second fluid storage plenum. The housing cover defines an intermediate-fluid port in fluid communication with the first fluid storage plenum via a first intermediate-fluid passage and the second fluid storage plenum via a second intermediate-fluid passage. Working fluid at an intermediate pressure enters the intermediate-fluid port. The intermediate pressure is greater than the suction pressure and less than the discharge pressure.

Provided is a control method with which, in a plant combining a GTCC and a CO2 recovery device, it is possible to supply sufficient steam to the CO2 recovery device even during start-up of the GTCC. Specifically provided is a steam supply system for supplying steam generated in a heat recovery steam generator to a CO2 recovery device that recovers CO2 from exhaust gas discharged by a power generation plant, which includes a gas turbine, the heat recovery steam generator, and a steam turbine, wherein medium-pressure steam generated in the heat recovery steam generator is supplied to the CO2 recovery device during start-up of the power generation plant.

The utility model discloses a system for efficiently preparing liquid nitrogen by using a two-stage membrane separation technology, and relates to the technical field of industrial purification and liquefied nitrogen. The membrane separation technology and the gas liquefaction technology are combined, so that nitrogen in air is purified, the residual pressure of medium-pressure gas is fully utilized to provide cold energy for high-concentration nitrogen liquefaction, and the residual potential energy of the high-concentration gas is utilized to improve the nitrogen generation efficiency. A compressor, a gas cooling module, a first-stage separator and a second-stage separator of the system are sequentially arranged in the flowing direction of air. A high-pressure outlet of the second-stage separator is communicated with a first hot end inlet of the first heat exchanger; a first outlet of the first heat exchanger is communicated with a hot end inlet of the second heat exchanger, a second hot end inlet is communicated with a side backpressure outlet of the first-stage separator, a second outlet is communicated with a cold end inlet of the second heat exchanger through an expansion machine, a third outlet is communicated with atmosphere, and the cold end inlet is communicated with a second outlet of the second heat exchanger; and a side backpressure outlet of the second-stage separator is communicated with the compressor.

The invention belongs to the technical field of thermal power generating unit steam supply, and particularly discloses a thermal power plant coupling steam ejector and multi-heat-source fused salt heat storage steam supply system which comprises a thermal power generating unit body, a fused salt heat storage system and a steam supply system. And main steam and flue gas are used as heat sources for combined heat storage, on one hand, the main steam after heat release is used for extracting steam to supply low-parameter industrial steam, on the other hand, fused salt is used for storing heat to generate steam to eject a steam turbine intermediate-pressure cylinder to exhaust steam, and therefore high-parameter industrial steam is supplied, and the energy consumption is reduced. And peak regulation and heat supply tasks of the thermal power plant are synchronously met. According to the system, the deep peak regulation and industrial steam supply capacity of the thermal power generating unit is greatly improved, different steam supply parameter requirements can be met by adjusting parameters of the fused salt heat storage system and the structure of the ejector, flexible regulation and control of industrial steam supply of the thermal power generating unit are achieved, and the problems of a thermal power plant in the aspects of heat storage, peak regulation and steam supply are solved.

The application provides a multi-effect desalination system and relates to the technical field of multi-effect evaporation. The multi-effect desalination system can have two working conditions under the action of a first valve, a second valve and a third valve. The first working condition is that the third valve is closed, and the first valve and the second valve are opened. At this time, low-pressure steam discharged by a low-pressure steam generation device is directly introduced into a first-effect evaporator as heating steam. A second condenser can condense part of secondary steam generated by an mth-effect evaporator, so that the pressure in the first condenser and the second condenser is balanced, and the two can work under normal working conditions. The second working condition is that the second valve is opened, the first valve and the third valve are closed, and the second condenser stops working. Medium-pressure steam discharged from a medium-pressure steam generation device is introduced into the mth-effect evaporator to inject the secondary steam generated by the mth-effect evaporator through a steam heat compressor. After mixing, the medium-pressure steam is introduced into the first-effect evaporator as heating steam, so that the energy of the medium-pressure steam can be effectively utilized, and a higher water production ratio is obtained.

The present application provides a spiral compressor comprising: a movable spiral disk; a fixed spiral disk, wherein the fixed spiral disk has a base plate and a spiral wall arranged on the base plate; and a housing arranged on the side of the base plate facing away from the spiral wall.The housing comprises a first chamber having a first opening on the bottom surface of the housing facing the base plate, this first opening being covered by the base plate to form an injection chamber connected via an injection port on the base plate to the compression chamber, which is formed by the movable spiral disk and the fixed spiral disk and corresponds to the intermediate pressure stage, the first chamber being connected to the injection port of the scroll compressor, wherein a check valve is arranged in the first chamber, which releases the flow in the direction from the injection port to the injection chamber and prevents backflow. The present application also relates to a corresponding heat pump device. The advantage of this application lies in its ability to form an injection chamber for a scroll compressor with a simple structure and a small number of components.

The application discloses a device and method for preventing dry burning of a reheater of a waste heat boiler, and the device comprises a high-pressure blowing unit, a medium-pressure blowing unit, a low-pressure blowing unit and a reheater unit. The high-pressure blowing unit and the medium-pressure blowing unit can ensure that the reheater unit has steam flow in the whole blowing process, and the low-pressure blowing unit can stabilize the blowing pressure. The device and method can prevent the reheater from being in a dry burning state during blowing.

The invention relates to an on-line oil-free preparation system and method for compressed air with the high pressure of 45 MPa. The system and the method are long in service life, high in gas production pressure, high in automation degree, capable of being remotely controlled and capable of achieving oil-free compression and comprise a medium-pressure oil-free compression device, and the medium-pressure oil-free compression device is used for compressing free-state air to medium pressure; the drying and purifying device is used for filtering, adsorbing and drying the medium-pressure gas compressed by the medium-pressure oil-free compression device; the buffer device is used for buffering the medium-pressure air filtered and dried by the drying and purifying device; the supercharging device is used for carrying out secondary supercharging on the medium-pressure air in the buffer device; and the control system is used for carrying out power distribution on each device, carrying out process control according to a preset program, and monitoring and displaying operation parameters of each device.

Oscillating piston compressor (1) with medium pressure inlet (2), comprising in a housing (4) a cylinder (5) with a oscillating piston (3), wherein the oscillating piston (3) is rotatably mounted on an eccentric (6) of a drive shaft (7) and comprises a separating slide (8) rigidly connected to the oscillating piston (3), a pivot bushing (9) rotatably mounted in the housing (4) for linear guidance of the separating slide (8) in a separating slide guide (10), a low-pressure inlet (11) which is operatively connected to an inlet chamber (5a) in the cylinder (5), a medium pressure inlet (2) which is operatively connected to an outlet chamber (5b) in the cylinder (5), wherein the medium pressure inlet (2) comprises a first section (2a) with a check valve (13) in the housing (4), a second section (2b) in the oscillating bushing (9) and a third section (2c) in the separating slide (8), and a high-pressure outlet (12) which is operatively connected to the outlet chamber (5b) in the cylinder (5).

The invention relates to a method for controlling a thermal conditioning system (100) for a motor vehicle, comprising a refrigerant circuit (10) comprising:- A main loop (A) successively comprising:- a compressor (7),- a first exchanger (1) thermally coupled with an interior air flow (Fi),- a second exchanger (2),- A first bypass branch (B), - A second bypass branch (C), comprising a third exchanger (3) thermally coupled with an element (25) of an electric traction chain,- A third bypass branch (D) comprising a fourth exchanger (4) exchanging heat with the interior air flow (Fi), the method comprising the successive steps:- circulating refrigerant at high pressure in the first exchanger (1),- expanding the refrigerant to an intermediate pressure and circulating it in the third exchanger (3),- expand the refrigerant fluid to a low pressure and circulate it in the fourth exchanger (4). Abstract figure: Figure 3,

This refrigeration cycle device comprises: a low-stage compression unit (111) that discharges an intermediate-pressure refrigerant; intermediate-pressure cooling units (12, 13d, 14b); a high-stage compression unit (112) that suctions the intermediate-pressure refrigerant; a heat dissipation unit (16) that allows a high-pressure refrigerant discharged from the high-stage compression unit (112) to dissipate heat; low-pressure decompression units (14c, 14d); evaporation units (18, 19); and an internal high / low pressure heat exchange unit (17b). The high-stage compression unit (112) suctions the intermediate-pressure refrigerant cooled by the intermediate-pressure cooling units (12, 13d, 14b). The internal high / low pressure heat exchange unit (17b) exchanges heat between the high-pressure refrigerant flowing out from the heat dissipation unit (16) and a low-pressure refrigerant suctioned into the low-stage compression unit (111).

The utility model discloses a kind of medium-pressure nitrogen gas supply system in air separation device, including liquid nitrogen storage tank, water bath type heat exchanger, first medium-pressure nitrogen pump and second medium-pressure nitrogen pump;The liquid nitrogen storage tank is connected with the water bath type heat exchanger through first medium-pressure nitrogen pipeline, the water bath type heat exchanger is connected with medium-pressure nitrogen gas pipe network through gas nitrogen delivery pipeline;The first medium-pressure nitrogen pump is set on the first medium-pressure nitrogen pipeline;Second medium-pressure nitrogen pipeline is connected on the first medium-pressure nitrogen pipeline between the liquid nitrogen storage tank and the first medium-pressure nitrogen pump, and the other end of the second medium-pressure nitrogen pipeline is connected on the first medium-pressure nitrogen pipeline between the first medium-pressure nitrogen pump and water bath type heat exchanger.The advantage is: by adding second medium-pressure nitrogen pump, ensure that medium-pressure nitrogen gas is stably supplied, avoid the pressure fluctuation of medium-pressure nitrogen gas pipe network caused by the frequent start-stop of first medium-pressure nitrogen pump, while reducing equipment failure rate;By interlocking the medium-pressure nitrogen pump with medium-pressure nitrogen gas pipe network, the overpressure risk of medium-pressure nitrogen gas pipe network is avoided.

A vapour compression refrigeration system has a main refrigerant circuit having a main gas cooler or condenser arranged in a high pressure branch, a first main evaporator arranged in a first low pressure branch, a main compressor fluidically connecting the first low pressure branch to the high pressure branch, and an expansion device connecting the high pressure branch to an intermediate pressure branch. The system has a by-pass branch connecting the high-pressure branch to the intermediate pressure branch and provided with a by-pass valve, a secondary refrigerant circuit having a secondary gas cooler or condenser arranged in a secondary high pressure branch, a secondary evaporator arranged in a secondary low pressure branch, and a secondary expansion device connecting the secondary high pressure branch to the secondary low pressure branch. A rotary pressure exchanger is fluidically connected to the by-pass branch downstream of the by-pass valve and the secondary refrigerant circuit.

The invention discloses a steam inlet control system which comprises a medium-pressure cylinder, a low-pressure cylinder and a communicating pipeline connecting the medium-pressure cylinder and the low-pressure cylinder, and further comprises a steam inlet control valve arranged on the communicating pipeline, the inlet end of the steam inlet control valve is connected with the medium-pressure cylinder, and the outlet end of the steam inlet control valve is connected with the low-pressure cylinder; and the inlet end of the bypass cooling pipeline is connected to the communicating pipeline between the steam inlet control valve and the medium-pressure cylinder, and the outlet end of the bypass cooling pipeline is connected to the steam inlet of the low-pressure cylinder. According to the turbine low-pressure cylinder micro-output coupling operation system and method, the problems that blades are prone to flutter, overheating and water erosion under the low-pressure cylinder micro-output working condition are solved, and the safety and flexibility of deep peak regulation operation of a unit are remarkably improved.

This invention relates to a low-grade waste heat-driven two-stage absorption refrigeration system and method, comprising: a low-pressure stage solution circulation loop, a high-pressure stage solution circulation loop, and a refrigerant circulation loop; saturated liquid output from the condenser in the refrigerant circulation loop mixes with condensed saturated liquid output from the high-pressure stage solution circulation loop, and then undergoes primary throttling and pressure reduction to an intermediate pressure via a first throttling valve before entering a gas-liquid separator for separation; the separated saturated vapor is absorbed by the high-pressure stage solution circulation loop; the separated saturated liquid mixes with condensed saturated liquid output from the low-pressure stage solution circulation loop, and then undergoes secondary throttling and pressure reduction to an evaporation pressure via a second throttling valve before entering an evaporator for evaporation and cooling to generate cooling capacity. This invention utilizes two-stage throttling of the refrigerant at the condenser outlet to reduce irreversible losses, and simultaneously utilizes superheated steam from the generator outlet to preheat the dilute solution, fully utilizing waste heat, which can significantly improve the performance of traditional two-stage absorption refrigeration systems.

The invention relates to a method for controlling a thermal conditioning system comprising: - a main refrigerant circulation loop (A) (10) including: - a compressor (7), - a first heat exchanger (1), - a first expansion valve (31), - a second expansion valve (32), - a second heat exchanger (2), - a first bypass branch (B) including a third expansion valve (33), - a fourth bypass branch (E) including a fifth expansion valve (35), the method comprising the steps: (ii) circulating high-pressure refrigerant through the first heat exchanger (1), through the first branch (B) and through the fourth branch (E), (iv) reducing the refrigerant from the first heat exchanger (1) and the fourth branch (E) to an intermediate pressure, and circulating it through the third heat exchanger (3),(vi) reduce the refrigerant from the third heat exchanger (3) to a low pressure and mix it with the low-pressure refrigerant from the first branch (B). Figure 3,

The double-layer piping (1) has: an inner pipe (3) through which a low-temperature fluid passes; and an outer pipe (5) covering the outside of the inner pipe and forming a heat insulation layer (7) between the inner pipe and the outer pipe, wherein a thrust support structure (9) is provided between the inner pipe (3) and the outer pipe (5), the thrust support structure having: a first pressure-bearing member (11) fixed to the outer peripheral surface (3a) of the inner pipe (3) having a first pressure-bearing surface (11a) facing a first direction (D1) along the axis (C) of the double-layer piping (1); a second pressure-bearing member (13) fixed to the inner peripheral surface (5a) of the outer pipe (5) having a second pressure-bearing surface (13a) facing a second direction (D2) opposite to the first direction (D1); and a first intermediate pressure-bearing member (15) formed of heat insulation material disposed between the first pressure-bearing surface (11a) of the first pressure-bearing member (11) and the second pressure-bearing surface (13a) of the second pressure-bearing member (13).

A combined cycle power generation facility of an embodiment includes: a gas turbine; a heat recovery steam generator including a high-pressure steam generation part which generates steam by using an exhaust gas of the gas turbine, and a reheat part which reheats steam; a high-pressure turbine to which the steam from the high-pressure steam generation part is introduced; an intermediate-pressure turbine provided on a downstream side of the high-pressure turbine; a reheat steam pipe connecting an outlet of the high-pressure turbine and an inlet of the intermediate-pressure turbine with the reheat part interposed therebetween; a combustor to which steam discharged from the intermediate-pressure turbine is introduced, and which combusts oxygen and hydrogen to reheat the introduced steam; a low-pressure turbine to which steam discharged from the combustor is introduced; and a condenser which changes steam discharged from the low-pressure turbine into condensed water.

The invention discloses a compressed air energy storage system which comprises a compressor unit, the compressor unit comprises a first-stage compressor, a second-stage compressor, a third-stage compressor and a fourth-stage compressor which are connected in sequence and is used for compressing air, the first-stage compressor and the second-stage compressor operate in a mode of variable-frequency starting and fixed-frequency operation, and the pressure ratio is not changed in the operation process; and the third-stage compressor and the fourth-stage compressor operate in a variable-frequency starting and variable-frequency operation mode, and the pressure ratio is changed during operation. And the expansion unit comprises a first turbine and a second turbine and is used for expansion acting, and the first turbine is provided with adjustable guide vanes. The system is reasonable in structural design, can guarantee constant power output, and has the advantages of high energy storage density, high system efficiency and low investment cost.

The utility model relates to the technical field of petroleum processing, in particular to a heat source utilization device for an aromatic hydrocarbon extraction process, which comprises a medium-pressure superheated steam generating device, a steam exhaust port of the diesel oil hydrogenation steam turbine is communicated with an inlet end of the desuperheater; and the outlet end of the desuperheater and the outlet end of the temperature and pressure reducer are connected in parallel and then are respectively communicated with the steam inlet of the stripping tower reboiler, the steam inlet of the recovery tower reboiler, the steam inlet of the regeneration tower reboiler, the steam inlet of the benzene tower feeding heater and the steam inlet of the toluene tower reboiler. According to the utility model, surplus low-pressure superheated steam discharged by the diesel hydrogenation steam turbine is used as a heat carrier of the stripping tower reboiler, the recovery tower reboiler, the regeneration tower reboiler, the benzene tower feeding heater and the toluene tower reboiler, so that the use amount of medium-pressure superheated steam is reduced, and the recycling of the surplus low-pressure superheated steam is realized.

The invention provides a jet-absorption heat pump, and belongs to the technical field of refrigeration and heat pumps. The absorber is provided with a dilute solution pipeline which is communicated with the generator through a solution pump and a solution heat exchanger, the generator is further provided with a concentrated solution pipeline which is communicated with the absorber through the solution heat exchanger, the generator is further provided with a refrigerant steam channel which is communicated with the condenser, and the condenser is further provided with a condensate water channel which is communicated with the outside. The condenser communicates with the evaporator through a refrigerant liquid pipeline via a throttling valve, the evaporator communicates with a low-pressure steam inlet of the ejector through a refrigerant steam channel, a working steam channel communicates with a high-pressure steam inlet of the ejector outside, the ejector communicates with the absorber through a medium-pressure refrigerant steam channel, and the generator communicates with the outside through a high-temperature heat medium channel. The absorber and the condenser are communicated with the outside through heated medium channels respectively, the evaporator is communicated with the outside through a low-temperature heat medium channel, and the jet-absorption heat pump is formed.

The present application proposes a method, system, electronic device and storage medium for warning high exhaust pressure of an intermediate pressure cylinder of a steam turbine, wherein the method includes: determining the exhaust absolute pressure of the intermediate pressure cylinder of the steam turbine based on multiple measured pressures of multiple exhaust pressure measuring points corresponding to the intermediate pressure cylinder of the steam turbine and the atmospheric pressure corresponding to the intermediate pressure cylinder of the steam turbine, calculating the pressure safety factor of the intermediate pressure cylinder of the steam turbine based on the reference exhaust absolute pressure and exhaust absolute pressure corresponding to the intermediate pressure cylinder of the steam turbine under the fully open valve working condition, and controlling the monitoring system corresponding to the intermediate pressure cylinder of the steam turbine to issue an early warning based on the comparison result of the pressure safety factor with a preset pressure safety early warning value, thereby realizing real-time early warning of the exhaust pressure of the intermediate pressure cylinder of the steam turbine based on the pressure safety factor of the intermediate pressure cylinder of the steam turbine, thereby ensuring safe operation of the steam turbine.

The invention discloses a durability testing device for a refrigerant sharing type compressor, and relates to the technical field of compressor testing. The compressor testing device comprises a plurality of single testing assemblies, each single testing assembly is provided with a tested compressor, and the single testing assemblies are arranged on a total testing assembly in parallel; each single test assembly is composed of a refrigerant loop formed by connecting a plurality of refrigerant pipelines, a mixer and an oil separator are arranged on the loop, and an oil outlet of the oil separator is connected with an oil inlet of a tested compressor through an oil circulation pipeline. And an air suction port and an air exhaust port of the tested compressor are lapped on the refrigerant loop through refrigerant pipelines and are communicated with the refrigerant loop. The system is high in configuration flexibility, due to the fact that refrigerants are supplied in a centralized mode, the middle pressure can be controlled, large and small systems can be flexibly configured on a single station, working conditions of different capacity sections can be conveniently tested, and the working condition stability is guaranteed. Meanwhile, different concentrative liquid storage tank condensers can store different refrigerants, and testing and switching of the different refrigerants are facilitated.

The application discloses a thermal power peak shaving system and method integrating a steam ejector and a steam heat storage device, and the system comprises a coal-fired system and a steam heat storage system; when the unit load is reduced, the steam heat storage system extracts main steam and reheated steam from high-pressure and low-pressure steam storage tanks respectively for storage; when the unit load is increased, the steam in the steam storage tank is used as a power steam source of the steam ejector, the steam ejector is used to inject cylinder exhaust steam, the steam heat in the steam storage tank and the waste heat of the cylinder exhaust steam are fully utilized to heat feed water, steam extraction of the steam turbine is reduced, more steam enters the steam turbine to do work, the outlet steam temperature of the primary steam ejector is higher than the steam extraction temperature of the high-pressure cylinder and the medium-pressure cylinder corresponding to the current load, and the outlet steam temperature of the secondary steam ejector is higher than the steam extraction temperature of the low-pressure cylinder corresponding to the current load, so that the feed water pump can deliver more feed water into the coal-fired boiler to generate more steam to enter the steam turbine to do work, and the unit can meet the requirement of the rapid load variation rate.

The invention relates to a steam source switching system of a small steam turbine, the small steam turbine is provided with a first steam inlet and a second steam inlet, the steam source switching system comprises a steam recovery mechanism, and the steam recovery mechanism comprises a first pipeline, a second pipeline and a recovery pipeline; one end of the first pipeline is used for being communicated with the first steam inlet, and the other end of the first pipeline is provided with a low-pressure main steam valve and a first isolating valve which are connected with a main engine four-extraction low-pressure steam source; one end of the second pipeline is used for being communicated with the second steam inlet, and the other end of the second pipeline is provided with a medium-pressure main steam valve and a second isolating valve which are connected with a medium-pressure steam source of a main machine; one end of the recovery pipeline is communicated with the first pipeline, and the other end of the recovery pipeline is communicated with the second pipeline. According to the steam source switching system of the small steam turbine, low-temperature steam formed by long-time stagnation and cooling of medium-pressure steam at the medium-pressure main steam valve is prevented from entering the steam chamber of the small steam turbine to form impact, and the operation stability of the small steam turbine is improved.

The utility model relates to a steam condensate energy recovery system. The energy recovery system comprises a condensate collection unit and a steam condensate energy recovery unit, a steam pressurization unit; a medium pressure steam supply unit; a low-pressure steam pipe network unit; a steam flash unit; and optionally, a condensate heat exchange unit; the system is characterized in that flooding gas of the condensate collecting unit (100) is connected with the steam pressurizing unit (200) through a flooding gas discharging pipeline (101); medium-pressure steam provided by a medium-pressure steam providing unit (300) enters the steam pressurizing unit (200) through a medium-pressure steam inlet (202). And the pressurized steam is discharged through a pressurized steam outlet (203) and finally enters the low-pressure steam pipe network unit (400).

The invention discloses a refrigeration enthalpy increasing control method and system based on intermediate pressure and multi-parameter coupling. The method comprises the steps that the intermediate pressure, the operation frequency of a compressor and the temperature of a coil pipe are collected in real time; the basic enthalpy increasing opening degree is determined on the basis of the intermediate pressure, a dynamic compensation value is calculated on the basis of the coil pipe temperature, the basic enthalpy increasing opening degree is combined with the dynamic compensation value, and the target opening degree of the electronic expansion valve for enthalpy increasing is determined; and the electronic expansion valve for enthalpy increasing is adjusted according to the target opening degree of the electronic expansion valve for enthalpy increasing, and therefore refrigeration enthalpy increasing control is achieved. According to the invention, rapid response, accurate adjustment and system protection of enthalpy increase control are realized.