High-temperature heat pump steam generation device and method based on composite enthalpy increase

Abstract

The invention relates to a steam generation device, in particular to a high-temperature heat pump steam generation device and method based on composite enthalpy increasing, and the device comprises an indirect compression enthalpy increasing subsystem, a direct compression enthalpy increasing subsystem, a water circulation system and a hot water supply system; the indirect compression enthalpy increasing subsystem is used for producing cold water and providing a heat source for the water circulation system; the direct compression enthalpy increasing subsystem comprises a separator, a water vapor compressor and a vapor storage tank which are communicated in sequence, the separator can complete gas-liquid separation to form low-temperature and low-pressure vapor and liquid water, the low-temperature and low-pressure vapor is compressed into high-temperature and high-pressure vapor through the water vapor compressor, and the high-temperature and high-pressure vapor is stored in the vapor storage tank; the water circulation system is used for heating and evaporating liquid water in the separator to a gas-liquid coexistence state; and the hot water supply system is used for storing the high-temperature hot water in the separator. The device can replace an electric boiler, carbon emission is reduced while steam is generated, and the device can be combined with new energy such as wind energy and solar energy to consume new energy electric power.

Description

Technical Field

[0001] The present invention relates to the technical field of steam generating devices, and in particular to a high-temperature heat pump steam generating device and method based on compound enthalpy increase. Background Art

[0002] The working principle of a steam boiler is that fuel (such as coal, natural air or biomass) burns in a combustion chamber to produce high-temperature flue gas, which flows around the water pipes in the furnace wall, heats the water and converts it into steam through heat transfer. Once steam is formed, it is directed to the equipment or system that requires steam to provide heat or activity for the industrial process. After the steam has transferred heat, it cools and turns into water, which is reheated and recycled.

[0003] Steam boilers in the existing technology convert the combustion energy of electricity, oil, and gas into heat energy, which is at most equivalent to the energy released by combustion or the energy provided by electricity. Water source heat pump water heaters and air source heat pump water heaters both use the heat transfer technology of heat pumps. In the existing technology, water is generally heated to about 70°C, which does not reach boiling. Since the current industrial power needs to provide high-temperature and high-pressure steam, its energy cannot be effectively utilized when it cannot boil. Therefore, some boilers use electric heating in the second half to achieve the output of high-temperature steam. If the heat pump technology is first used to heat to 70°C, and then other energy sources are used to heat the boiler, the energy efficiency ratio has been greatly reduced.

[0004] The common disadvantages of conventional electric, oil, and gas steam boilers in the prior art are low energy efficiency, the inability to use environmental energy, the inability to effectively utilize various wastewater, factory sewage, environmental hot water, and hot water in solar water heaters, and the resulting carbon emissions. Hybrid boilers that use heat pumps and conventional electric, oil, and gas heating have the disadvantages of low energy efficiency, high cost, complex use, and high noise. In addition, the boilers in the prior art heat water into steam by providing heat, and their heating method is simple and direct, which can easily cause the internal pressure of the boiler to continue to rise. When the boiler fails, the increasing pressure can easily cause explosions and other accidents, posing a great threat to the surrounding environment and operators.

[0005] Therefore, how to provide a high-temperature heat pump steam generating device and method based on compound enthalpy increase to solve at least one of the above problems. Summary of the invention

[0006] The present invention provides a high-temperature heat pump steam generating device and method based on compound enthalpy increase, which are used to solve the defect of high pollution caused by direct electric drive in the prior art and achieve pollution reduction.

[0007] The present invention provides a high-temperature heat pump steam generating device based on compound enthalpy increase, comprising: Indirect compression enthalpy increase subsystem, direct compression enthalpy increase subsystem, water circulation system and hot water supply system; The indirect compression enthalpy increase subsystem is used to produce cold water and provide a heat source for the water circulation system; The direct compression enthalpy increase subsystem comprises a separator, a water vapor compressor and a steam storage tank which are connected in sequence, wherein the separator can separate gas and liquid to form low-temperature low-pressure steam and liquid water, and the low-temperature low-pressure steam is compressed into high-temperature high-pressure steam by the water vapor compressor, and the high-temperature high-pressure steam is stored in the steam storage tank; The water circulation system is connected to the indirect compression enthalpy increase subsystem and the separator, and the water circulation system is used to heat and evaporate the liquid water in the separator to a gas-liquid coexistence state; The hot water supply system is used to store the high-temperature hot water in the separator to produce hot water.

[0008] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the indirect compression enthalpy increase subsystem includes an evaporator, a heat pump compressor, a condenser and a throttle valve connected in sequence, the evaporator is connected to an external heat source, the external heat source enters the evaporator to exchange heat with a liquid working medium, the liquid working medium is heated and evaporated into a vapor working medium, the vapor working medium is isentropically compressed into superheated steam by the heat pump compressor, the superheated steam enters the condenser to complete the heating of water in the water circulation system, the superheated steam that completes the heat exchange is condensed into a liquid working medium and enters the throttle valve, the condensed working medium enters the evaporator after being cooled and reduced in pressure by the throttle valve, and the circulation of the working medium is completed.

[0009] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the direct compression enthalpy increase subsystem also includes a filter, the inlet of the filter is connected to the separator, and the outlet of the filter is connected to the water vapor compressor, and the filter is used to filter out liquid water mixed in the steam, and the low-temperature and low-pressure steam that has completed filtration enters the water vapor compressor.

[0010] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the steam storage tank is also connected to a supplementary steam valve, and the supplementary steam valve is used to provide supplementary steam for the steam storage tank.

[0011] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the water vapor compressor also includes a self-lubricating water spray module, the self-lubricating water spray module includes a water spray valve and a water spray pump, the separator, the water spray valve, the water spray pump and the water vapor compressor are sequentially connected as a loop, when the self-lubricating water spray module is in operation, the water spray valve is opened, the water spray pump draws water from the separator into the water vapor compressor to lubricate the water vapor compressor, and the water that has completed lubrication is returned to the separator.

[0012] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the water vapor compressor also includes an oil supply module, the oil supply module includes an oil tank, an oil supply regulating valve and an oil supply pump, the oil tank, the oil supply regulating valve, the oil supply pump and the water vapor compressor are sequentially connected as a loop, when the oil supply module is in operation, the oil supply regulating valve is opened, the oil supply pump draws lubricating oil from the oil tank, supplies lubricating oil to the oil-lubricated parts inside the water vapor compressor, and the oil that has completed lubrication continues to return to the oil tank.

[0013] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the hot water supply system includes a hot water valve, a hot water pump and a water storage tank connected in sequence, the hot water valve is connected to the separator, and the high-temperature hot water in the separator is pumped into the water storage tank by the hot water pump.

[0014] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, it also includes a data acquisition module and a control cabinet, the data acquisition module is used to collect real-time parameters; a protection parameter range is set in the control cabinet, when the real-time parameters exceed the protection parameter range, the control cabinet controls the indirect compression enthalpy increase subsystem, the direct compression enthalpy increase subsystem, the water circulation system and the hot water supply system to stop working.

[0015] According to a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention, the working fluid in the evaporator is one of CO2 working fluid, R134a working fluid, R245fa working fluid and water working fluid.

[0016] The present invention also provides a steam generation method of a high-temperature heat pump steam generation device based on compound enthalpy increase, comprising: Produce cold water and provide heat source for water circulation system through indirect compression enthalpy increase subsystem; The separator in the direct compression enthalpy increase subsystem is used to separate gas and liquid into low-temperature low-pressure steam and liquid water. The low-temperature low-pressure steam is compressed into high-temperature high-pressure steam by a water vapor compressor, and the high-temperature high-pressure steam is stored in a steam storage tank. The indirect enthalpy increase subsystem and the separator are connected via a water circulation system, and the liquid water is heated and evaporated to a gas-liquid coexistence state via the water circulation system; The high-temperature hot water in the separator is stored through a hot water supply system to produce hot water.

[0017] The high-temperature heat pump steam generating device and method based on composite enthalpy increase provided by the present invention generates cold water and provides a heat source for a water circulation system through an indirect compression enthalpy increase subsystem, and the separator in the direct compression enthalpy increase subsystem completes gas-liquid separation to form low-temperature low-pressure steam and liquid water. The low-temperature low-pressure steam is compressed into high-temperature high-pressure steam by a water vapor compressor, and the high-temperature high-pressure steam is stored in a steam storage tank. The water circulation system connects the indirect compression enthalpy increase subsystem and the separator, and the water circulation system heats and evaporates the liquid water in the separator to a gas-liquid coexistence state. The hot water supply system stores the high-temperature hot water in the separator to produce hot water. Carbon emissions can be reduced. The steam generating device provided by the present invention reduces carbon emissions while generating steam, and can be combined with new energy sources such as wind energy and solar energy to absorb new energy electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural principle diagram of a high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention.

[0020] Reference numerals: 1. Indirect compression enthalpy increase subsystem; 2. Direct compression enthalpy increase subsystem; 3. Water circulation system; 4. Hot water supply system; 11. Evaporator; 12. Heat pump compressor; 13. Throttle valve; 14. Condenser; 21. Separator; 22. Filter; 23. Steam compressor; 24. Water spray valve; 25. Water spray pump; 26. Oil tank; 27. Oil supply regulating valve; 28. Oil supply pump; 29. ​​Steam storage tank; 30. Steam supplement valve; 31. Circulation pump; 41. Hot water valve; 42. Hot water pump; 43. Water storage tank; 51. Control cabinet; T1. Oil tank temperature sensor; L1. Oil tank level sensor; P1. Oil supply pressure sensor; T2. Separator temperature sensor; L2. Separator level sensor; P2. Separator pressure sensor; F1. Water spray flow sensor; T3. Steam storage tank temperature sensor; P3. Steam storage tank pressure sensor; L3. Water storage tank level sensor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] Combine the following Figure 1 The first embodiment of the present invention is described, which provides a high-temperature heat pump steam generating device based on compound enthalpy increase, including an indirect compression enthalpy increase subsystem 1, a direct compression enthalpy increase subsystem 2, a water circulation system 3 and a hot water supply system 4.

[0024] The indirect compression enthalpy increase subsystem 1 is used to produce cold water and provide a heat source for the water circulation system 3 .

[0025] The direct compression enthalpy increase subsystem 2 includes a separator 21, a water vapor compressor 23 and a steam storage tank 29 which are connected in sequence. The separator 21 can complete gas-liquid separation to form low-temperature low-pressure steam and liquid water. The low-temperature low-pressure steam is compressed into high-temperature high-pressure steam by the water vapor compressor 23, and the high-temperature high-pressure steam is stored in the steam storage tank 29. The water circulation system 3 connects the indirect compression enthalpy increase subsystem 1 and the separator 21. The water circulation system 3 is used to heat and evaporate the liquid water in the separator 21 to a gas-liquid coexistence state. The hot water supply system 4 is used to store the high-temperature hot water in the separator 21 and produce hot water, which can reduce carbon emissions. Carbon emissions are reduced while steam is generated. Moreover, it can be combined with new energy sources such as wind energy and solar energy to absorb new energy electricity.

[0026] In a feasible embodiment of the present invention, the indirect compression enthalpy increase subsystem 1 includes an evaporator 11, a heat pump compressor 12, a condenser 14 and a throttle valve 13 connected in sequence. The make-up water in the separator 21 is circulated, heated and evaporated in the condenser 14 and the separator 21 under the action of the water circulation system 3. The heat source in the condenser 14 is provided by the indirect compression enthalpy increase subsystem 1. The evaporator 11 is connected to an external heat source, and the external heat source enters the evaporator 11 to exchange heat with the liquid working medium. The liquid working medium is heated and evaporated into a vapor working medium. After the external personnel complete the heat exchange, it becomes cooling water, which can provide cooling water for the production process according to demand. The vapor working medium enters the heat pump compressor 12, isentropically compressed into superheated steam by the heat pump compressor 12, and the superheated steam enters the condenser 14 to complete the water heating in the water circulation system 3. The superheated steam that completes the heat exchange is condensed into a liquid working medium and enters the throttle valve 13. The condensed working medium enters the evaporator 11 after cooling and reducing pressure through the throttle valve 13, completing the circulation of the working medium.

[0027] Among them, after the liquid water and superheated steam in the water circulation system 3 complete the heat exchange, they are heated and evaporated into a steam-water mixture and enter the separator 21. The steam-water mixture completes gas-liquid separation in the separator 21. Among them, the liquid water continues to circulate in the separator 21 and the condenser 14 under the action of the water circulation system 3.

[0028] In a feasible embodiment of the present invention, the direct compression enthalpy increase subsystem 2 further includes a filter 22, the inlet of the filter 22 is connected to the separator 21, the outlet of the filter 22 is connected to the water vapor compressor 23, and the filter 22 is used to filter out the liquid water mixed in the steam, and the low-temperature and low-pressure steam that has been filtered enters the water vapor compressor 23. The low-temperature and low-pressure steam enters the filter 22, and the mixed liquid water in the steam is filtered out. The low-temperature and low-pressure steam that has been filtered enters the water vapor compressor 23, and the water vapor compressor 23 compresses the low-temperature and low-pressure steam that has been filtered into high-temperature and high-pressure steam and stores it in the steam storage tank 29.

[0029] Among them, as for the selection of the steam compressor 23, if the steam output below 130°C is required and the compression ratio of the steam is less than 2.5, it is recommended to use a Roots-type steam compressor; if the output is required to be above 130°C or the compression ratio is greater than 2.5, it is recommended to use a screw-type steam compressor.

[0030] For the selection of heat exchanger types in the indirect compression enthalpy increase subsystem 1 and the direct compression enthalpy increase subsystem 2, if the working fluid is pure and there is no risk of crystallization or precipitation near the operating conditions, a plate heat exchanger is recommended.

[0031] In a feasible embodiment of the present invention, the steam storage tank 29 is also connected to a supplementary steam valve 30, which is used to provide supplementary steam to the steam storage tank 29. The supplementary steam valve 30 can be opened to provide water vapor according to steam demand.

[0032] In a feasible embodiment of the present invention, the water vapor compressor 23 also includes a self-lubricating water spray module, which includes a water spray valve 24 and a water spray pump 25. The separator 21, the water spray valve 24, the water spray pump 25 and the water vapor compressor 23 are sequentially connected as a loop. In order to prevent the water in the separator 21 from vaporizing after passing through the water spray pump 25, the head of the water spray pump 25 is above 10m; a separator liquid level sensor L2 is provided on the separator 21 to monitor and control the liquid level of the separator 21 in real time according to the collected liquid level data; a water spray flow sensor F1 is provided at the outlet of the water spray valve 24 to monitor and control the water spray flow in real time according to the collected flow data. When the self-lubricating water spray module is in operation, the water spray valve 24 is opened, and the water spray pump 25 draws water from the separator 21 into the water vapor compressor 23 to lubricate the water vapor compressor 23, and the water that has completed lubrication returns to the separator 21.

[0033] It should be noted that the lubricating parts in the water vapor compressor 23 generally include components such as a star wheel, a rotor and a cavity.

[0034] In a feasible embodiment of the present invention, the water vapor compressor 23 further includes an oil supply module, which includes an oil tank 26, an oil supply regulating valve 27 and an oil supply pump 28. The oil tank 26, the oil supply regulating valve 27, the oil supply pump 28 and the water vapor compressor 23 are sequentially connected as a loop, and the oil tank 26 provides lubricating oil to the water vapor compressor 23; when the oil supply module is running, the oil supply regulating valve 27 is opened, and the oil supply pump 28 draws lubricating oil from the oil tank 26 into the water vapor compressor 23, and supplies lubricating oil to the oil-lubricated parts inside the water vapor compressor 23, and the lubricated oil continues to return to the oil tank 26. Among them, the oil-lubricated parts of the water vapor compressor 23 include mechanical seals and bearings.

[0035] More specifically, the outlet pressure of the oil supply pump 28 should be between 4 and 10 bar; the lubricating oil in the oil tank 26 should be No. 32 or No. 46 turbine oil, and the oil temperature should be controlled below 80°C; a temperature sensor T1 is provided on the oil tank 26 to monitor and control the oil temperature of the oil tank 26 in real time according to the collected temperature data, and an oil tank level sensor L1 is provided on the oil tank 26 to monitor and control the liquid level of the oil tank 26 in real time according to the collected liquid level data; an oil supply pressure sensor P1 is provided at the outlet of the oil supply pump 28 to monitor and control the oil supply pressure in real time according to the collected pressure data; a heat exchange coil is provided inside the oil tank 26, and the diameter of the heat exchange coil is between 19 and 38 mm. Cooling water flows in the coil to cool the oil temperature in the oil tank 25 and recover the waste heat of the lubricating oil.

[0036] In a feasible embodiment of the present invention, the hot water supply system 4 includes a hot water valve 41, a hot water pump 42 and a water storage tank 43 which are connected in sequence. The hot water valve 41 is connected to the separator 21, and the high-temperature hot water in the separator 21 is pumped into the water storage tank 43 by the hot water pump 42.

[0037] The cooling water after heat exchange cooling of the low-temperature heat source in the indirect compression enthalpy increase subsystem 1 can provide cold water for other production processes, the hot water stored in the water storage tank 43 in the hot water supply system 4 can provide hot water for other production processes, and the high-temperature and high-pressure steam stored in the steam storage tank 29 in the direct compression enthalpy increase subsystem 2 can provide steam for other production processes.

[0038] In a feasible embodiment of the present invention, it also includes a data acquisition module and a control cabinet 51. The data acquisition module is used to collect real-time parameters. A protection parameter range is set in the control cabinet 51. When the real-time parameters exceed the protection parameter range, the control cabinet 51 controls the indirect compression enthalpy increase subsystem 1, the direct compression enthalpy increase subsystem 2, the water circulation system 3 and the hot water supply system 4 to stop working.

[0039] Specifically, the separator 21 is connected with a separator temperature sensor T2, a separator pressure sensor P2, and a separator liquid level sensor L2. The separator temperature sensor T2, the separator pressure sensor P2, the oil supply pressure sensor P1, and the oil tank liquid level sensor L1 are connected with the control cabinet 51 to realize data collection and monitoring. When the monitoring data exceeds the setting requirements, an alarm is issued. When it further deviates from the set value, the operation of the water vapor compressor 23 is stopped to protect the water vapor compressor 23.

[0040] The oil tank 26 is connected to an oil supply pressure sensor P1 and an oil supply regulating valve 27, and the oil supply pressure sensor P1 and the oil supply regulating valve 27 are connected to a control system; pressure data acquisition monitoring and pressure regulation are realized. When the oil supply pressure data acquisition is higher than the set value, the control system calculates and issues a command to reduce the opening of the oil supply regulating valve 27. When the oil supply pressure data acquisition is lower than the set value, the control system calculates and issues a command to increase the opening of the oil supply regulating valve 27 to ensure that the oil supply pressure is maintained at the set level.

[0041] The steam storage tank 29 is connected to a steam storage tank temperature sensor T3 and a steam storage tank pressure sensor P3. The steam storage tank temperature sensor T3 and the steam storage tank pressure sensor P3 are connected to the control system to realize data collection and monitoring. When the monitoring data exceeds the set requirements, an alarm is issued. When it further deviates from the set value, the steam supplement valve 30 is opened to exhaust steam or the steam compressor 23 is directly stopped to protect the water vapor compressor 23.

[0042] The water tank 43 is connected to a water tank level sensor L3, which is connected to a control system to achieve data collection and monitoring. When the monitored liquid level exceeds the set requirements, an alarm is issued, and when it further deviates from the set value, the hot water pump is stopped.

[0043] That is to say, water spray protection, oil supply pressure protection, Roots compressor temperature protection and working fluid temperature protection can be realized through the control cabinet 51. When the water spray flow rate is lower than the protection value, the system automatically stops the compressor. When the oil supply pressure is lower than the protection value, the system automatically stops the compressor; when the temperature of the Roots compressor is higher than the protection value, the system automatically stops the Roots compressor. When the temperature of the working fluids R134a, R245fa and CO2 is higher or lower than the protection value, the system stops for protection.

[0044] Furthermore, the control system can use PID control technology and PLC control to perform real-time monitoring and intelligent control of the process parameters of each part of the device during operation, making the control of the device more flexible and allowing the working processes of each part to cooperate with each other, thereby improving the reliability of the device.

[0045] The high-temperature heat pump steam generating device based on compound enthalpy increase provided by the present invention can adjust the compressor to match specific needs according to the steam pressure and flow rate, and can be used for multiple purposes, and can simultaneously produce cold, heat and steam; in addition, when producing high-temperature steam, a compression enthalpy increase subsystem in the corresponding temperature range can be selected according to the working conditions.

[0046] In the embodiment of the present invention, the steam output is 1 t / h, the water replenishment flow rate is 1 t / h, the working medium is R245fa, the indirect compression enthalpy increase subsystem can heat the water circulation in the separator to a gas-liquid mixture of 115°C, and the direct compression enthalpy increase subsystem can compress the 115°C steam in the separator into 150°C water vapor. In the indirect compression enthalpy increase subsystem, the condenser is preferably a plate heat exchanger, the material is preferably 304 stainless steel, and the heat exchange area of ​​the condenser is preferably 131 m 2 The evaporator is preferably a plate evaporator, the material is preferably 304 stainless steel, and the heat exchange area of ​​the evaporator is preferably 140 m 2, the axial flow velocity of the separator steam is controlled below 1 m / s, the heat pump compressor preferably adopts a single screw compressor, the compressor can achieve a compression ratio of 10 times, and the temperature rise is 30~80 ℃; in the direct compression enthalpy increase subsystem, the separator level sensor L2 preferably adopts a differential pressure level gauge, the water vapor compressor preferably adopts a Roots-type water vapor compressor, and the compression ratio is 1.2~3.0, the water spray valve 24 and the oil supply regulating valve 27 preferably adopt electric regulating valves, the water spray valve 24 and the oil supply regulating valve 27 are connected to the control system, and the valve opening is adjusted according to the system setting value, the steam supplement valve 30 preferably adopts an electric switch valve, the steam supplement valve 30 is connected to the control system, and the valve opening and closing are controlled according to the system setting, the oil tank level sensor L1 preferably adopts a magnetic flap level gauge, and the circulating pump power is preferably 5.5 kW, the water pump type is preferably a vertical multi-stage centrifugal pump, the water tank level sensor L3 is preferably a magnetic flap level gauge, the Roots-type steam compressor shock absorption is preferably a rubber shock pad, the compressor temperature monitoring is preferably installed with temperature sensors at the bearings and oil tanks, and the sensor is preferably a thermistor sensor.

[0047] In the embodiment of the present invention, the total energy consumption of the steam generating device based on compound enthalpy increase is 2377.642 MW·h in one year of operation, and the total energy consumption of the pure electric burning system in one year of operation is 3572.2 MW·h. Compared with the pure electric burning system, the compound enthalpy increase system saves 33.4% of energy, and the energy saving effect is significant.

[0048] In a feasible embodiment of the present invention, the working fluid in the evaporator 11 is one of CO2 working fluid, R134a working fluid, R245fa working fluid and water working fluid. Due to the adaptability of the system to the waste heat temperature, the working fluid of the indirect compression enthalpy increase subsystem 1 can be selected in different ways. If the waste heat temperature range is between -30 and 10°C, it is recommended to use a CO2 working fluid heat pump; if the waste heat temperature range is between 10 and 40°C, it is recommended to use R134a working fluid; if the waste heat temperature range is between 40 and 70°C, it is recommended to use R245fa working fluid; if the waste heat temperature range is above 70°C, it is recommended to use water working fluid.

[0049] A second aspect of the present invention provides a steam generation method using the high-temperature heat pump steam generation device based on compound enthalpy increase, comprising: Produce cold water and provide heat source for water circulation system through indirect compression enthalpy increase subsystem 1; The separator 21 in the direct compression enthalpy increase subsystem 2 is used to separate gas and liquid into low-temperature low-pressure steam and liquid water. The low-temperature low-pressure steam is compressed into high-temperature high-pressure steam by the water vapor compressor 23. The high-temperature high-pressure steam is stored in the steam storage tank 29. The indirect enthalpy increase subsystem 1 and the separator 21 are connected through the water circulation system 3, and the liquid water is heated and evaporated to a gas-liquid coexistence state through the water circulation system 3; The high-temperature hot water in the separator 21 is stored through the hot water supply system 4 to produce hot water.

[0050] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature heat pump steam generating device based on compound enthalpy increase, characterized in that: It includes an indirect compression enthalpy increase subsystem (1), a direct compression enthalpy increase subsystem (2), a water circulation system (3) and a hot water supply system (4); The indirect compression enthalpy increase subsystem (1) is used to produce cold water and provide a heat source for the water circulation system (3); The direct compression enthalpy increase subsystem (2) comprises a separator (21), a water vapor compressor (23) and a steam storage tank (29) which are connected in sequence, the separator (21) being capable of performing gas-liquid separation to form low-temperature low-pressure steam and liquid water, the low-temperature low-pressure steam being compressed into high-temperature high-pressure steam by the water vapor compressor (23), and the high-temperature high-pressure steam being stored in the steam storage tank (29); The water circulation system (3) is connected to the indirect compression enthalpy increase subsystem (1) and the separator (21), and the water circulation system (3) is used to heat and evaporate the liquid water in the separator (21) to a gas-liquid coexistence state; The hot water supply system (4) is used to store the high-temperature hot water in the separator (21) to produce hot water.

2. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 1, characterized in that: The indirect compression enthalpy increase subsystem (1) comprises an evaporator (11), a heat pump compressor (12), a condenser (14) and a throttle valve (13) which are connected in sequence. The evaporator (11) is connected to an external heat source. The external heat source enters the evaporator (11) to exchange heat with a liquid working medium. The liquid working medium is heated and evaporated into a vapor working medium. The vapor working medium is isentropically compressed into superheated steam by the heat pump compressor (12). The superheated steam enters the condenser (14) to complete the heating of water in the water circulation system (3). The superheated steam that has completed the heat exchange is condensed into a liquid working medium and enters the throttle valve (13). The condensed working medium passes through the throttle valve (13) to be cooled and depressurized before entering the evaporator (11), thereby completing the circulation of the working medium.

3. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 1, characterized in that: The direct compression enthalpy increase subsystem (2) further comprises a filter (22), the inlet of the filter (22) being connected to the separator (21), the outlet of the filter (22) being connected to the water vapor compressor (23), the filter (22) being used to filter out liquid water mixed in the steam, and the filtered low-temperature and low-pressure steam entering the water vapor compressor (23).

4. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 3 is characterized in that: The steam storage tank (29) is also connected to a supplementary steam valve (30), and the supplementary steam valve (30) is used to provide supplementary steam to the steam storage tank (29).

5. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 3, characterized in that: The water vapor compressor (23) further comprises a self-lubricating water spray module, the self-lubricating water spray module comprising a water spray valve (24) and a water spray pump (25), the separator (21), the water spray valve (24), the water spray pump (25) and the water vapor compressor (23) are sequentially connected to form a loop, when the self-lubricating water spray module is in operation, the water spray valve (24) is opened, the water spray pump (25) draws water from the separator (21) into the water vapor compressor (23), lubricates the water vapor compressor (23), and the water after lubrication is returned to the separator (21).

6. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 1, characterized in that: The water vapor compressor (23) further comprises an oil supply module, the oil supply module comprising an oil tank (26), an oil supply regulating valve (27) and an oil supply pump (28), the oil tank (26), the oil supply regulating valve (27), the oil supply pump (28) and the water vapor compressor (23) being sequentially connected to form a loop, and when the oil supply module is in operation, the oil supply regulating valve (27) is opened, the oil supply pump (28) draws lubricating oil from the oil tank (26), supplies lubricating oil to oil-lubricated parts inside the water vapor compressor (23), and the oil that has completed lubrication continues to return to the oil tank (26).

7. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 1, characterized in that: The hot water supply system (4) comprises a hot water valve (41), a hot water pump (42) and a water storage tank (43) which are connected in sequence; the hot water valve (41) is connected to the separator (21); and the high-temperature hot water in the separator (21) is pumped into the water storage tank (43) by the hot water pump (42).

8. The high-temperature heat pump steam generating device based on compound enthalpy increase according to any one of claims 1 to 7, characterized in that: It also includes a data acquisition module and a control cabinet (51), wherein the data acquisition module is used to acquire real-time parameters; a protection parameter range is provided in the control cabinet (51), and when the real-time parameters exceed the protection parameter range, the control cabinet (51) controls the indirect compression enthalpy increase subsystem (1), the direct compression enthalpy increase subsystem (2), the water circulation system (3) or the hot water supply system (4) to stop working.

9. The high-temperature heat pump steam generating device based on compound enthalpy increase according to claim 8, characterized in that: The working fluid in the evaporator (11) is one of CO2 working fluid, R134a working fluid, R245fa working fluid and water working fluid.

10. A steam generation method using the high-temperature heat pump steam generation device based on compound enthalpy increase according to any one of claims 1 to 9, characterized in that: include: Producing cold water and providing heat source for the water circulation system through the indirect compression enthalpy increase subsystem (1); The separator (21) in the direct compression enthalpy increase subsystem (2) is used to separate gas from liquid to form low-temperature low-pressure steam and liquid water. The low-temperature low-pressure steam is compressed into high-temperature high-pressure steam by a water vapor compressor (23). The high-temperature high-pressure steam is stored in a steam storage tank (29). The indirect enthalpy increase subsystem (1) and the separator (21) are connected via a water circulation system (3), and the liquid water is heated and evaporated to a gas-liquid coexistence state via the water circulation system (3); The high-temperature hot water in the separator (21) is stored through a hot water supply system (4) to produce hot water.

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