Steam compression heating equipment and its control method

Abstract

This invention relates to a steam compression heating device and its control method. The steam compression heating device includes: a steam system including a steam compressor (12), the steam compressor (12) including an intake port for introducing steam to be compressed and an exhaust port for discharging compressed steam; a refrigerant system including a refrigerant compressor (2) for compressing refrigerant and a refrigerant condenser (3) for condensing compressed refrigerant, the refrigerant condenser (3) being configured to heat water or steam to form steam to be compressed and delivered to the intake port of the steam compressor (12); wherein the refrigerant condenser (3) is connected to the steam system to deliver refrigerant for cooling to the steam pipeline and / or working device of the steam system, thereby improving the problem that the working device of the steam system is not easy to cool down in the related art.

Description

Technical Field

[0001] This invention relates to the field of heat pump equipment, and more specifically, to a water vapor compression heating device and its control method. Background Technology

[0002] Currently, with the rapid development of the social economy, global energy consumption is constantly increasing, and the call for the research and adoption of new energy-saving technologies is growing stronger. The recovery of low-grade waste heat and the improvement of its quality are particularly important for reducing the consumption of high-quality energy in industrial production and daily life. Steam, as a power source for industrial production, has been widely used in various industrial sectors such as food, pharmaceuticals, chemicals, seawater desalination, and wastewater treatment. The annual demand from the traditional Chinese medicine extraction and brewing industries alone reaches 360 million tons. Currently, industrial steam mainly comes from industrial boilers. Replacing traditional coal-fired boilers with high-temperature steam electric heat pumps can not only save energy but also reduce air pollution caused by coal-fired boilers.

[0003] Water, as a natural working fluid, has various advantages such as being green and pollution-free, widely available and inexpensive, safe, stable, and having a large latent heat of vaporization. However, it also has physical properties such as small molecular weight of water vapor, high adiabatic index, and large specific volume. Therefore, water vapor high-temperature heat pump units have the characteristics of small pressure difference, large pressure ratio, small heating capacity per unit volume, large volumetric flow rate, and high exhaust temperature.

[0004] As the core component of a heat pump unit, the centrifugal compressor has the advantage of large volumetric flow rate, but also suffers from the disadvantage of low single-stage pressure ratio. When water is used as the refrigerant, the impeller is particularly sensitive to liquid droplets, so the design requirements for the impeller are high. In order to output steam above 100°C, the pressure ratio of the centrifugal steam compressor is already as high as 2.1 when the suction temperature is 80°C. At this time, it is difficult to cool the heat-generating devices in the heat pump unit. For example, the oil temperature, motor and motor control device cannot be cooled by the conventional low-temperature refrigerant of the unit itself, because the lowest temperature in the unit is already as high as 80°C, which is not enough to cool the various devices. Summary of the Invention

[0005] The present invention aims to provide a steam compression heating device and its control method to improve the problem that the working device of the steam system in the prior art is not easy to cool down.

[0006] According to one aspect of the present invention, a steam compression heating device is provided, the steam compression heating device comprising:

[0007] A steam system, including a steam compressor, the steam compressor including an intake port for introducing steam to be compressed and an exhaust port for discharging compressed steam;

[0008] A refrigerant system includes a refrigerant compressor for compressing a refrigerant and a refrigerant condenser for condensing the compressed refrigerant, the refrigerant condenser being configured to heat water or steam to form steam to be compressed and supplied to the suction port of a steam compressor; and

[0009] The refrigerant condenser is connected to the steam system to supply refrigerant for cooling to the steam system's steam pipelines and / or working devices.

[0010] In some embodiments,

[0011] The working device includes a steam compressor;

[0012] The steam compression heating equipment also includes a cooling flow path that delivers refrigerant for cooling to the steam compressor from the refrigerant condenser.

[0013] In some embodiments,

[0014] A steam compressor includes a compression unit and a drive motor that drives the compression unit;

[0015] The cooling flow path includes a first cooling flow path that supplies refrigerant to the drive motor.

[0016] In some embodiments,

[0017] The steam compressor also includes a motor cavity for housing a drive motor, the motor cavity including an inlet communicating with a first cooling flow path; or

[0018] The steam compressor also includes a motor cooling radiator, which is configured to exchange heat with the drive motor and connected to a first cooling flow path to introduce refrigerant to cool the drive motor.

[0019] In some embodiments, a first throttling element disposed in a first cooling flow path is also included.

[0020] In some embodiments,

[0021] The steam compressor includes a motor control device for controlling the drive motor;

[0022] The cooling path includes a second cooling path that supplies refrigerant to the motor control unit.

[0023] In some embodiments, the steam compressor further includes a control device cooling radiator configured to exchange heat with the motor control device and connected to a second cooling flow path to introduce refrigerant to cool the motor control device.

[0024] In some embodiments, a second throttling component is further provided in the second cooling flow path.

[0025] In some embodiments,

[0026] The steam compressor also includes a lubricating oil line for introducing lubricating oil;

[0027] The cooling flow path includes a third cooling flow path that delivers refrigerant for cooling to the lubricating oil lines.

[0028] In some embodiments, the steam compressor further includes an oil cooling device for cooling the lubricating oil line. The oil cooling device includes a first flow path and a second flow path that exchanges heat with the first flow path. The first flow path is connected to a third cooling flow path to introduce refrigerant to cool the lubricating oil in the second flow path. The second flow path is connected to the lubricating oil line to introduce the lubricating oil that needs to be cooled.

[0029] In some embodiments, a third throttling component is also provided in the third cooling flow path.

[0030] In some embodiments,

[0031] The steam compressor includes a first compression section, a second compression section for compressing steam after it has been compressed by the first compression section, and a gas inlet communicating with an intermediate flow path between the first compression section and the second compression section.

[0032] The steam system also includes a heat exchanger configured to exchange heat with a refrigerant condenser to heat the water or steam flowing through the heat exchanger. The heat exchanger is connected to the air supply port of the steam compressor to supply cooling water or steam to the air supply port of the steam compressor.

[0033] In some embodiments, the heat exchanger is connected to the suction port of the steam compressor to output compressed steam to the steam compressor.

[0034] In some embodiments, the steam system further includes a steam cooling device, which includes a first flow path and a second flow path that exchanges heat with the first flow path. The inlet end of the first flow path is connected to a heat exchanger to introduce cooling water or steam, the outlet end of the first flow path is connected to the air supply port of the steam compressor, and the inlet end of the second flow path is connected to a refrigerant condenser to introduce cooling refrigerant.

[0035] In some embodiments, a first throttling element is provided in the pipeline between the refrigerant condenser and the second flow path of the water vapor cooling device.

[0036] In some embodiments, the steam system further includes:

[0037] A steam condenser is connected to a steam compressor and a heat exchanger respectively, so as to condense the water vapor compressed by the steam compressor and then send it to the heat exchanger for evaporation;

[0038] The ejector includes a first inlet connected to a steam condenser, a second inlet connected to a heat exchanger to introduce cooling water or steam, and an outlet connected to a steam compressor's air supply port.

[0039] In some embodiments, the steam compression heating device further includes:

[0040] The temperature detection component is configured to detect the suction temperature T of the second compression section of the steam compressor. X ;

[0041] The control valve includes an inlet connected to the steam condenser and an outlet connected to the first inlet of the ejector;

[0042] The controller, connected to the temperature sensing element and the control valve respectively, is configured to: at the intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≤Predetermined temperature T L Close the control valve or reduce its opening; and / or,

[0043] The intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≥Preset temperature T H Open the control valve or increase the opening degree of the control valve.

[0044] In some embodiments,

[0045] The steam system also includes a steam condenser for condensing steam compressed by the steam compressor, a first steam throttling component for throttling the condensed steam, a heat exchanger for evaporating the throttled steam, and a steam flash evaporator connected to the outlet end of the first steam throttling component. The steam flash evaporator includes an inlet connected to the first steam throttling component, a gas outlet connected to the gas supply port of the steam compressor, and a liquid outlet connected to the heat exchanger.

[0046] The steam compressor includes a first compression section and a second compression section for compressing the steam after it has been compressed by the first compression section. The air inlet is connected to the intermediate flow path between the first compression section and the second compression section.

[0047] In some embodiments, the refrigerant system includes a negative pressure refrigerant system, wherein the refrigerant circulating within the negative pressure refrigerant system is a negative pressure refrigerant.

[0048] In some embodiments, the refrigerant circulating in the refrigerant system is R1233zd.

[0049] According to another aspect of the present invention, a control method for the above-described steam compression heating device is also provided, which, in some embodiments, includes:

[0050] The refrigerant in the refrigerant condenser is delivered to the steam cooling device to cool the steam delivered from the heat exchanger used to heat the steam to the steam compressor's air inlet.

[0051] In some embodiments, including:

[0052] A steam condenser draws steam from the steam condenser, which then directs the steam cooled by the oil cooling device to the steam compressor's inlet.

[0053] The suction temperature T of the second compression section of the steam compressor, used to compress the water vapor after it has been compressed by the first compression section, is detected. X ;

[0054] The intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≤Predetermined temperature T L Close the control valve used to control the flow rate of steam drawn from the steam condenser or reduce the opening of the control valve; and / or,

[0055] The intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≥Preset temperature T H Open the control valve or increase the opening degree of the control valve.

[0056] According to another aspect of the present invention, a control method for the above-described steam compression heating device is also provided, comprising:

[0057] A working device that directs a portion of the refrigerant in the refrigerant condenser to the steam system for cooling is provided. The working device includes one or more of the following: a drive motor that drives the steam compressor, a motor control device for controlling the drive motor, and an oil cooling device for cooling the oil supplied to the steam compressor.

[0058] The temperature T of the detection device;

[0059] If the temperature T is greater than the target temperature T', the greater the difference between the temperature T and the target temperature T', the greater the opening of the throttling device.

[0060] In some embodiments, the difference between temperature T and target temperature T' is divided into multiple intervals from smallest to largest, and each interval corresponds to the opening degree of a throttling component, with the larger the difference, the larger the opening degree.

[0061] In this embodiment, the refrigerant condenser is connected to the steam system to output refrigerant for cooling to the steam system. This improves the problem that the working device of the steam system is not easy to cool down in the prior art, which is conducive to improving the working efficiency of the steam system and extending the service life of the heating system.

[0062] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0063] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0064] Figure 1 A schematic diagram of the heating system according to an embodiment of the present invention is shown. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] like Figure 1 As shown, the steam compression heating device in this embodiment includes a steam system and a refrigerant system.

[0067] The refrigerant system includes a refrigerant compressor 2 for compressing the refrigerant, a refrigerant condenser 3 for condensing the compressed refrigerant, a first refrigerant throttling component 4 for throttling the condensed refrigerant, and a refrigerant evaporator 1 for evaporating the throttled refrigerant.

[0068] In some embodiments, the refrigerant evaporator 1 is configured to exchange heat with the waste heat medium A. In this embodiment, the refrigerant compressed by the refrigerant compressor 2 is condensed in the refrigerant condenser. The condensed refrigerant is then throttled by the first refrigerant throttling component 4 and enters the refrigerant evaporator 1. During the evaporation process in the refrigerant evaporator 1, the refrigerant absorbs the waste heat in the waste heat medium A.

[0069] The steam system includes a steam compressor 12 for compressing steam. In this embodiment, the steam system also includes a steam condenser 13 for condensing the compressed steam, a steam throttling device 14 for throttling the condensed steam, and a heat exchanger 10 for evaporating the throttled steam. The steam condenser 13 is configured to heat the user's water B, and the heat exchanger 10 is configured to exchange heat with the refrigerant condenser 3.

[0070] During the condensation of the refrigerant in the refrigerant condenser 3, the water vapor in the heat exchanger 10 is heated, thereby ensuring that the temperature of the water vapor meets the suction requirements of the steam compressor 12. The water vapor compressed by the steam compressor 12 is then condensed in the steam condenser 13 to heat the user's water supply B.

[0071] In other embodiments, the steam system also includes a water supply line, and the refrigerant condenser 3 heats the water in the water supply line into steam required by the suction port of the steam compressor 12, which then supplies the compressed steam directly to the user.

[0072] In the water vapor system, water vapor circulates. In the refrigerant system, conventional refrigerants (not water vapor) circulate, such as derivatives of saturated hydrocarbons (commonly known as Freon), saturated hydrocarbons (such as propane, isobutane, etc.), unsaturated hydrocarbons (such as ethylene, propylene, etc.), azeotropic refrigerants (such as R502, etc.), and non-azeotropic refrigerants (such as R407c, R410, etc.).

[0073] Furthermore, the refrigerant condenser 3 is connected to the steam system to deliver refrigerant for cooling to the steam pipeline or working device of the steam system. This improves the problem that the working device of the steam system is not easy to cool down in the prior art, which is conducive to improving the working efficiency of the steam system and extending the service life of the steam compression heating equipment.

[0074] It should be noted that when the refrigerant condenser 3 is connected to the water vapor system, the connection does not mean that the refrigerant condenser 3 is connected to the water vapor channel of the water vapor system to achieve gas or liquid exchange. Rather, it means that the refrigerant condenser 3 is connected to the working device or device outside the water vapor channel of the water vapor system to deliver refrigerant for cooling.

[0075] In this embodiment, the refrigerant system first uses waste heat to heat the water vapor in the steam system, thus improving the problem in the prior art that industrial waste heat cannot directly provide heat to the steam system.

[0076] The refrigerant system includes a negative pressure refrigerant circulation system, in which the refrigerant circulating is a negative pressure refrigerant.

[0077] The refrigerant circulating in the refrigerant system is R1233zd. Preferably, the refrigerant is R1233zd(E).

[0078] The heat exchanger 10 includes a steam system and a heat exchange medium flow path for exchanging heat with the steam in the steam system. The refrigerant condenser 3 includes a refrigerant system and a heat exchange medium flow path for exchanging heat with the refrigerant in the refrigerant system. The heat exchange medium flow path of the heat exchanger 10 and the heat exchange medium flow path of the refrigerant condenser 3 are connected.

[0079] The inlet of the heat exchange medium flow path of heat exchanger 10 is connected to the outlet of the heat exchange medium flow path of refrigerant condenser 3, and the outlet of the heat exchange medium flow path of heat exchanger 10 is connected to the inlet of the heat exchange medium flow path of refrigerant condenser 3, so as to form a circulating heat exchange medium loop.

[0080] In some embodiments, the steam compression heating device further includes a first pump 22 that connects the heat exchange medium flow path of the heat exchanger 10 and the heat exchange medium flow path of the refrigerant condenser 3. The first pump 22 is used to drive the heat exchange medium to circulate in the heat exchange medium flow path of the heat exchanger 10 and the refrigerant condenser 3.

[0081] In some embodiments, the heat exchange medium includes water.

[0082] In this embodiment, the refrigerant system is a high-temperature heat pump unit using the novel negative-pressure refrigerant R1233zd(E). This unit is responsible for heating the heat exchange medium to about 80°C using a waste heat source of about 30°C, achieving a maximum temperature rise of 50°C. R1233zd(E) refrigerant is a negative-pressure refrigerant with low pressure; at 85°C, the pressure is only 742 kPa. If conventional R134a refrigerant is used, its pressure is as high as 2924 kPa, thus requiring a very high pressure-bearing capacity for the pipelines. The pipelines are unlikely to meet these pressure requirements, therefore, this novel negative-pressure refrigerant is preferred for the refrigerant system.

[0083] Taking the condensation heat of 35℃ as an example, the high-temperature heat pump unit using the new negative pressure refrigerant R1233zd(E) can achieve a temperature rise of 50℃, and can generate hot water of 85℃ in the heat exchange medium flow path in the refrigerant condenser 3. Then, the 85℃ hot water is carried into the heat exchange medium flow path of the heat exchanger 10 by the first pump 22, thereby generating 80℃ water vapor in the water vapor system of the heat exchanger 10. The water vapor enters the suction port of the water vapor compressor 12, and after being compressed by the water vapor compressor 12, the water vapor enters the water vapor condenser 13 for condensation. The condensed water vapor is throttled and then enters the heat exchanger 10 again for evaporation, so as to form a water vapor cycle.

[0084] The inlet and outlet of the steam system of heat exchanger 10 are connected to steam condenser 13 and steam compressor 12, respectively. The inlet and outlet of the refrigerant system of refrigerant condenser 3 are connected to refrigerant compressor 2 and refrigerant evaporator 1, respectively.

[0085] The refrigerant system also includes a refrigerant flash evaporator 5, which includes an inlet connected to the outlet of the refrigerant condenser 3, a gas outlet connected to the gas supply port of the refrigerant compressor 2, and a liquid outlet connected to the refrigerant evaporator 1. In some embodiments, a second refrigerant throttling component 6 is also provided in the pipeline between the liquid outlet of the refrigerant flash evaporator 5 and the refrigerant evaporator 1.

[0086] The refrigerant compressor 2 includes a first compression section and a second compression section that compresses the refrigerant after it has been compressed by the first compression section. The gas supply port of the refrigerant compressor 2 is connected to the intermediate flow path that connects the first compression section and the second compression section.

[0087] The steam system also includes a steam flash evaporator 15, which includes an inlet connected to the first steam throttling component 14, a gas outlet connected to the gas supply port of the steam compressor 12, and a liquid outlet connected to the heat exchanger 10. The steam compressor 12 includes a first compression section and a second compression section for compressing the steam after compression by the first compression section. The gas supply port is connected to the intermediate flow path between the first compression section and the second compression section.

[0088] The steam system also includes a second steam throttling component 16, the inlet end of which is connected to the liquid outlet of the heat exchanger 10, and the outlet end of which is connected to the steam system of the heat exchanger 10.

[0089] The steam system also includes a gas-liquid separator 11, which includes a liquid inlet connected to the liquid outlet of the steam flasher 15 and a gas outlet connected to the suction port of the steam compressor 12.

[0090] The gas-liquid separation device 11 also includes a gas inlet connected to the steam outlet of the heat exchanger 10 for outputting evaporated water vapor.

[0091] In the steam system, after absorbing heat from the refrigerant condenser 3 in the heat exchanger 10, steam at 80°C is generated in the steam system of the heat exchanger 10. This steam enters the gas-liquid separator 11, and the steam separated by the gas-liquid separator 11 enters the suction port of the steam compressor 12. This is mainly because the centrifugal steam compressor 12 cannot perform wet compression, and the gas-liquid separator 11 can prevent the steam compressor 12 from carrying liquid into the suction.

[0092] Water vapor is compressed by water vapor compressor 12 to form high-temperature and high-pressure steam (temperature can reach 100℃). Then, the high-temperature and high-pressure water vapor heats the user's water B in water vapor condenser 13. After that, the water vapor enters water vapor flash evaporator 15 through the first water vapor throttling component 14 to complete the first stage of throttling. The outlet of water vapor flash evaporator 15 is divided into two paths. One path is gas entering the middle gas supply port of water vapor compressor 12 from the upper part of water vapor flash evaporator 15, while the liquid coming out from the bottom of water vapor flash evaporator 15 is throttled by the second water vapor throttling component 16 and enters gas-liquid separator 11. Then, it is transported by the second pump 17 to the water vapor system of heat exchanger 10 to exchange heat with the heat exchange medium and generate 80℃ steam, thus completing the entire water vapor cycle.

[0093] The steam compression heating device also includes a steam flash evaporator 15 for detecting the evaporation pressure of the steam, so as to calculate the evaporation temperature T of the steam based on the evaporation pressure. S .

[0094] The steam system also includes an ejector 24, which includes a first inlet connected to the steam condenser 13, a second inlet connected to the heat exchanger 10, and an outlet.

[0095] The steam compressor 12 includes a first compression section, a second compression section for compressing the steam compressed by the first compression section, and an intermediate flow path connecting the first compression section and the second compression section. The intermediate flow path is connected to the outlet of the ejector 24.

[0096] The steam compression heating device also includes a temperature detection component, a control valve 23, and a controller. The temperature detection component is configured to detect the intake temperature T of the second compression section. X The control valve 23 includes an inlet connected to the steam condenser 13 and an outlet connected to the first inlet of the ejector 24.

[0097] The controller is signal-connected to the temperature detection unit and control valve 23 respectively and is configured to: at the intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≤Predetermined temperature T L Close control valve 23 or reduce the opening of control valve 23; and / or, at the intake temperature T of the second compression section. X - Evaporation temperature of water vapor T S ≥Preset temperature T H Open control valve 23 or increase the opening degree of control valve. Wherein, T H ≥T L In some embodiments, T H =0.5, T L =0.2.

[0098] In this embodiment, the intake temperature T of the second compression sectionX Above the evaporation temperature T of water vapor S When the temperature is high, opening the control valve 23 or increasing the opening degree of the control valve to input more hot water vapor into the air supply port of the steam compressor 12 is beneficial to increase the intake volume of the second compression section while ensuring the intake dryness of the second compression section of the steam compressor 12.

[0099] The intake temperature T of the second compression section X Above the evaporation temperature T of water vapor S When the temperature is low, close control valve 23 or reduce the opening of control valve 23 to reduce the amount of low-temperature water vapor input to the air supply port of steam compressor 12, so as to ensure the suction dryness of the second compression section of steam compressor 12.

[0100] The steam system also includes a steam cooling device 25, which includes a first flow path and a second flow path for refrigerant to exchange heat with the steam in the first flow path. The inlet end of the first flow path of the steam cooling device 25 is connected to the heat exchanger 10 to introduce the evaporated steam. The outlet end of the first flow path of the steam cooling device 25 is connected to the second inlet of the ejector 24. The inlet end of the second flow path of the steam cooling device 25 is connected to the refrigerant condenser 3 to introduce the condensed refrigerant. The outlet end of the second flow path of the steam cooling device 25 is connected to the suction port of the refrigerant compressor 2. A first throttling component 7 is provided in the pipeline between the refrigerant condenser 3 and the second flow path of the steam cooling device 25.

[0101] In some embodiments, the steam cooling device 25 includes a plate heat exchanger.

[0102] Because excessively high exhaust temperatures will shorten the lifespan of the compressor, and excessively high exhaust temperatures in the first compression section will also reduce the intake volume of the second compression section. Since water has a high adiabatic index and high exhaust temperature when used as a refrigerant, in order to reduce the exhaust temperature of the first compression section of the steam compressor 12, water vapor discharged from the steam flash evaporator 15 is used to replenish air between the first and second compression sections of the steam compressor 12.

[0103] Furthermore, the ejector 24 is used to transport water vapor from the heat exchanger 10 between the first and second compression sections of the steam compressor 12 to cool the intake air of the second compression section. The first inlet of the ejector 24 is connected to the steam condenser 13 to use the high-pressure water in the steam condenser 13 as a power source to eject the low-pressure water vapor from the heat exchanger 10.

[0104] The low-pressure water vapor is cooled and subcooled by the water vapor cooling device 25. The refrigerant in the refrigerant condenser 3 is throttled by the first throttling component 7 and then cooled by the water vapor cooling device 25. The cooled low-pressure water vapor becomes a lower-temperature liquid and is sprayed into the flow path between the first and second compression sections of the water vapor compressor 12. This ensures that the intake gas of the second compression section is close to saturated gas and reduces the intake superheat of the second compression section. In this way, the exhaust temperature of the water vapor compressor is reduced to the maximum extent. The control strategy for reducing the exhaust temperature is as follows:

[0105] A temperature detection component is installed at the intake port of the second compression section of the steam compressor 12 to detect the intake temperature T of the second compression section of the steam compressor 12. X A pressure detection component is installed on the water vapor flash evaporator 15 to detect the intermediate flash pressure, and the corresponding flash temperature T can be calculated by the controller. S After the exhaust gas from the first compression section of the steam compressor mixes with the flash gas, it becomes the intake gas for the second compression section. At this time, the intake temperature of the second compression section of the steam compressor must be between the flash temperature and the exhaust temperature of the first compression section.

[0106] To ensure that the suction temperature of the second compression section of the steam compressor is close to the flash temperature (i.e., the saturated gas temperature), a control valve 23 is installed between the ejector 24 and the steam condenser 13. When T... X -T S ≥T H At time 0, control valve 23 remains open; optionally, T H =0.5. When T X -T S ≤T L When, control valve 23 is closed; optionally, T L =0.2. This control logic ensures the suction dryness of the second compression section of the steam compressor and reduces the discharge temperature of the steam compressor.

[0107] In some embodiments, the outlet end of the second flow path of the water vapor cooling device 25 is connected to the refrigerant evaporator 1.

[0108] In this embodiment, the steam compressor 12 includes a compression device, a drive motor 18 for driving the compression device, a motor control device 19 for controlling the drive motor 18, and a lubrication system. In some embodiments, the motor control device includes a frequency converter.

[0109] The working device requiring cooling in the steam system includes a steam compressor 12. The steam compression heating equipment also includes a cooling flow path that supplies refrigerant for cooling to the steam compressor 12 via the refrigerant condenser 3.

[0110] The cooling flow path includes a first cooling flow path that supplies refrigerant to the drive motor 18, a second cooling flow path that supplies refrigerant to the motor control device 19, and a third cooling flow path that supplies refrigerant to the lubricating oil system.

[0111] The steam compressor 12 includes a motor cooling radiator configured to exchange heat with the drive motor 18 and connected to a first cooling flow path to introduce refrigerant to cool the drive motor 18.

[0112] In other embodiments, the steam compressor 12 further includes a motor cavity for housing the drive motor, the motor cavity including an inlet communicating with the first cooling flow path and an outlet communicating with the suction port of the refrigerant compressor.

[0113] The steam compression heating device also includes a first throttling component 7 disposed in the first cooling flow path.

[0114] The steam compressor 12 also includes a control device cooling radiator, which is configured to exchange heat with the motor control device 19 and connected to a second cooling flow path to introduce refrigerant to cool the motor control device 19.

[0115] The steam compression heating device also includes a second throttling component 8 located in the second cooling flow path.

[0116] The steam compressor 12 also includes a lubricating oil pipeline for introducing lubricating oil; the cooling flow path includes a third cooling flow path for supplying refrigerant for cooling to the lubricating oil pipeline.

[0117] The steam compressor also includes an oil cooling device 21 for cooling the lubricating oil pipeline. The oil cooling device 21 includes a first flow path and a second flow path that exchanges heat with the first flow path. The first flow path is connected to a third cooling flow path to introduce refrigerant to cool the oil in the second flow path. The inlet end of the second flow path is connected to the oil tank 20, and the outlet end of the second flow path outputs oil to the steam compressor 12.

[0118] The steam compression heating device also includes a third throttling component 9 located in the third cooling flow path.

[0119] The steam compression heating device also includes a motor temperature detection component. The controller is connected to the motor temperature detection component and the first throttling component 7 respectively, so as to increase the opening degree of the first throttling component 7 when the motor temperature T1 detected by the motor temperature detection component increases.

[0120] Specifically, when the refrigerant system is powered on for the first time, the first throttling component 7 performs a reset action. The reset action is to first open the first throttling component 7 to 100%, and then close the first throttling component 7 and maintain the opening at 0. After the steam system is turned on, the opening of the first throttling component 7 is adjusted to the initial cooling opening setting value. After the first throttling component 7 reaches the delay adjustment time setting value, the opening is adjusted according to the target temperature value T1'. The action cycle is to adjust once every cooling cycle setting value. The opening increment of each adjustment is recorded as K1. The adjustment method adopts graded adjustment.

[0121] When T1-T1'≥15℃, K1=10%;

[0122] When 8℃≤T1-T1'<15℃, K1=5%;

[0123] When 3℃≤T1-T1'<8℃, K1=3%;

[0124] When T1-T1' < 3℃, K1 = 0%.

[0125] The steam compression heating equipment also includes a temperature detection component of the control device. The controller is connected to the temperature detection component of the control device and the second throttling component 8 respectively, so as to increase the opening degree of the second throttling component 8 when the temperature T2 of the motor control device detected by the temperature detection component of the control device increases.

[0126] Specifically, when the refrigerant system is powered on for the first time, the second throttling component 8 performs a reset action. The reset action involves first opening the second throttling component 8 to 100%, then closing the second throttling component 8 and maintaining the opening at 0. After the steam system is turned on, the opening of the second throttling component 8 is adjusted to the initial cooling opening setting value. After the second throttling component 8 reaches the delay adjustment time setting value, the opening is adjusted again according to the target temperature value T2'. The action cycle is once every cooling cycle setting value, and the opening increment of each adjustment is recorded as K2. The adjustment method adopts a graded adjustment.

[0127] When T2-T2'≥15℃, K2=10%;

[0128] When 8℃≤T2-T2'<15℃, K2=5%;

[0129] When 3℃≤T2-T2'<8℃, K2=3%;

[0130] When T2-T2'<3℃, K2=0%.

[0131] The steam compression heating equipment also includes an oil temperature detection component. The controller is connected to the oil temperature detection component and the third throttling component 9 respectively, so as to increase the opening of the third throttling component 9 when the temperature T3 of the cooled oil detected by the oil temperature detection component increases.

[0132] Specifically, when the refrigerant system is powered on for the first time, the third throttling component 9 performs a reset action. The reset action involves opening the third throttling component 9 to 100% first, then closing the third throttling component and maintaining the opening at 0%. After the steam system is turned on, the opening of the third throttling component 9 is adjusted to the initial cooling opening setting value. After the third throttling component 9 reaches the delay adjustment time setting value, the opening is adjusted according to the target temperature value T1'. The action cycle is once every cooling cycle setting value, and the opening increment for each adjustment is recorded as K3. The adjustment method adopts a graded adjustment.

[0133] When T3-T3'≥15℃, K3=10%;

[0134] When 8℃≤T3-T3'<15℃, K3=5%;

[0135] When 3℃≤T3-T3'<8℃, K3=3%;

[0136] When T3-T3'<3°C, K3=0%.

[0137] According to another aspect of the present invention, a control method for a steam compression heating device is also provided, the control method comprising:

[0138] The refrigerant in the refrigerant condenser 3 is supplied to the steam cooling device 25 to cool the steam supplied from the heat exchanger 10 used to heat the steam to the air supply port of the steam compressor 12.

[0139] In some embodiments, the control method includes:

[0140] A steam stream is drawn from the steam condenser 13 to inject the steam cooled by the oil cooling device 25 into the air supply port of the steam compressor 12.

[0141] The suction temperature T of the second compression section of the steam compressor 12, which is used to compress the water vapor after it has been compressed by the first compression section, is detected. X ;

[0142] The intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≤Predetermined temperature T L Close the control valve used to control the flow rate of steam drawn from the steam condenser 13 or reduce the opening of the control valve; and / or,

[0143] The intake temperature T in the second compression section X - Evaporation temperature of water vapor T S ≥Preset temperature T H Open the control valve or increase the opening degree of the control valve.

[0144] The intake temperature T of the second compression section X Above the evaporation temperature T of water vapor S When the temperature is high, opening the control valve 23 or increasing the opening degree of the control valve to input more hot water vapor into the air supply port of the steam compressor 12 is beneficial to increase the intake volume of the second compression section while ensuring the intake dryness of the second compression section of the steam compressor 12.

[0145] The intake temperature T of the second compression section X Above the evaporation temperature T of water vapor S When the temperature is low, close control valve 23 or reduce the opening of control valve 23 to reduce the amount of low-temperature water vapor input to the air supply port of steam compressor 12, so as to ensure the suction dryness of the second compression section of steam compressor 12.

[0146] According to another aspect of the present invention, a control method for a steam compression heating device is also provided, the control method comprising:

[0147] A working device that directs a portion of the refrigerant in the refrigerant condenser 3 to the steam system for cooling is provided. The working device includes one or more of the following: a drive motor 18 that drives the steam compressor 12, a motor control device 19 for controlling the drive motor 18, and an oil cooling device 21 for cooling the oil supplied to the steam compressor 12.

[0148] The temperature T of the detection device;

[0149] If the temperature T is greater than the target temperature T', the greater the difference between the temperature T and the target temperature T', the greater the opening of the throttling device.

[0150] In this embodiment, the greater the difference between temperature T and the target temperature value T', the greater the opening of the throttling component, that is, the more refrigerant is introduced for cooling, so as to quickly reduce the temperature of the working device.

[0151] In this embodiment, the difference between temperature T and the target temperature value T' is divided into multiple intervals from smallest to largest. Each interval corresponds to the opening degree of a throttling component, and the larger the difference, the larger the opening degree. Specifically, refer to the control method for the first throttling component 7, the second throttling component 8, and the third throttling component 9 described above.

[0152] In this embodiment, the opening degree of the throttling component is adjusted according to levels, which helps to reduce the frequency of opening degree adjustment and avoid the problem of the actual temperature oscillating around the target temperature.

[0153] The steam compression heating device of this embodiment achieves the following technical effects compared to the prior art:

[0154] 1. First, the refrigerant system uses a low-temperature waste heat medium A (e.g., 35°C) to heat the heat exchange medium in the refrigerant condenser 3 to a higher temperature (e.g., 85°C). Then, the heat exchange medium in the refrigerant condenser 3 is transported to the heat exchanger 10 to heat the water vapor in the heat exchanger 10, so that the temperature of the water vapor (e.g., 80°C) can meet the operating requirements of the water vapor system. Therefore, the water vapor compression heating equipment in this embodiment can be used to recover low-temperature industrial waste heat and achieve a significant temperature increase.

[0155] 2. By throttling the refrigerant in the refrigerant condenser 3 and using it for cooling the drive motor 18, the motor control device 19, and the oil, the problem of cooling various heat-generating components in the steam system is solved.

[0156] 3. The water vapor emitted by the water vapor flasher 15 is transported between the first and second compression sections of the water vapor compressor 12. Simultaneously, the ejector 24 transports water vapor from the heat exchanger 10, cooled by the water vapor cooling device 25, between the first and second compression sections of the water vapor compressor 12, thereby lowering the exhaust temperature of the water vapor heat pump unit. The temperature is then adjusted based on the intake temperature T of the second compression section. X Adjusting the opening of control valve 23 adjusts the amount of low-temperature steam supplied to the air inlet of steam compressor 12, ensuring that the suction temperature of steam compressor 12 is above the saturation temperature, avoiding the problem of liquid carrying in the suction and damaging the impeller due to excessive cooling, or the problem of excessively high exhaust temperature due to insufficient cooling, thus achieving precise cooling and reducing the exhaust temperature.

[0157] 4. Based on the intake temperature T of the second compression section X The evaporation temperature T of water vapor S The opening and closing of the relationship regulation control valve 23 ensures the suction dryness of the second compression section of the steam compressor 12 and solves the problem of excessively high exhaust temperature of the steam compressor.

[0158] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steam compression heating device, characterized in that, include: A steam system includes a steam compressor (12), the steam compressor (12) including an intake port for introducing steam to be compressed and an exhaust port for discharging compressed steam; A refrigerant system includes a refrigerant compressor (2) for compressing a refrigerant and a refrigerant condenser (3) for condensing the compressed refrigerant, the refrigerant condenser (3) being configured to heat water or steam to form steam to be compressed and delivered to the suction port of the steam compressor (12); as well as The refrigerant condenser (3) is connected to the steam system to supply refrigerant for cooling to the steam pipeline and / or working device of the steam system.

2. The steam compression heating device according to claim 1, characterized in that, The working device includes the steam compressor (12); The steam compression heating device also includes a cooling flow path that supplies refrigerant for cooling to the steam compressor (12) from the refrigerant condenser (3).

3. The steam compression heating device according to claim 2, characterized in that, The steam compressor (12) includes a compression device and a drive motor (18) that drives the compression device. The cooling path includes a first cooling path that supplies refrigerant to the drive motor (18).

4. The steam compression heating device according to claim 3, characterized in that, The steam compressor (12) further includes a motor cavity for housing the drive motor, the motor cavity including an inlet communicating with the first cooling flow path; or The steam compressor also includes a motor cooling radiator configured to exchange heat with the drive motor (18) and connected to the first cooling flow path to introduce refrigerant to cool the drive motor (18).

5. The steam compression heating device according to claim 3 or 4, characterized in that, It also includes a first throttling component (7) disposed in the first cooling flow path.

6. The steam compression heating device according to claim 2, characterized in that, The steam compressor (12) includes a motor control device (19) for controlling the drive motor (18). The cooling path includes a second cooling path that supplies refrigerant to the motor control device (19).

7. The steam compression heating device according to claim 6, characterized in that, The steam compressor also includes a control device cooling radiator configured to exchange heat with the motor control device (19) and connected to the second cooling flow path to introduce refrigerant to cool the motor control device (19).

8. The steam compression heating device according to claim 6 or 7, characterized in that, It also includes a second throttling component (8) disposed in the second cooling flow path.

9. The steam compression heating device according to claim 2, characterized in that, The steam compressor (12) also includes a lubricating oil pipeline for introducing lubricating oil; The cooling flow path includes a third cooling flow path that delivers refrigerant for cooling to the lubricating oil pipeline.

10. The steam compression heating device according to claim 9, characterized in that, The steam compressor (12) further includes an oil cooling device (21) for cooling the lubricating oil pipeline. The oil cooling device (21) includes a first flow path and a second flow path that exchanges heat with the first flow path. The first flow path is connected to the third cooling flow path to introduce refrigerant to cool the lubricating oil in the second flow path. The second flow path is connected to the lubricating oil pipeline to introduce the lubricating oil that needs to be cooled.

11. The steam compression heating device according to claim 9 or 10, characterized in that, It also includes a third throttling component (9) provided in the third cooling flow path.

12. The steam compression heating device according to claim 1, characterized in that, The steam compressor (12) includes a first compression section, a second compression section for compressing steam after being compressed by the first compression section, and a gas inlet communicating with an intermediate flow path between the first compression section and the second compression section. The steam system also includes a heat exchanger (10) configured to exchange heat with the refrigerant condenser (3) to heat the water or steam flowing through the heat exchanger (10), and the heat exchanger (10) is connected to the air supply port of the steam compressor (12) to supply cooling water or steam to the air supply port of the steam compressor (12).

13. The steam compression heating device according to claim 12, characterized in that, The heat exchanger (10) is connected to the suction port of the steam compressor (12) to output the steam to be compressed to the steam compressor (12).

14. The steam compression heating device according to claim 12, characterized in that, The steam system also includes a steam cooling device (25), which includes a first flow path and a second flow path that exchanges heat with the first flow path. The inlet end of the first flow path is connected to the heat exchanger (10) to introduce the cooling water or steam. The outlet end of the first flow path is connected to the air supply port of the steam compressor (12). The inlet end of the second flow path is connected to the refrigerant condenser (3) to introduce the cooling refrigerant.

15. The steam compression heating device according to claim 14, characterized in that, A first throttling component (7) is provided in the pipeline between the refrigerant condenser (3) and the second flow path of the water vapor cooling device (25).

16. The steam compression heating device according to claim 12, characterized in that, The steam system also includes: A steam condenser (13) is connected to the steam compressor (12) and the heat exchanger (10) respectively, so as to transport the steam compressed by the steam compressor (12) to the heat exchanger (10) for evaporation after condensation; The ejector (24) includes a first inlet connected to the steam condenser (13), a second inlet connected to the heat exchanger (10) to introduce the cooling water or steam, and an outlet connected to the air supply port of the steam compressor (12).

17. The steam compression heating device according to claim 16, characterized in that, Also includes: The temperature detection component is configured to detect the suction temperature T of the second compression section of the steam compressor (12). X ; The control valve (23) includes an inlet connected to the steam condenser (13) and an outlet connected to the first inlet of the ejector (24); The controller, which is signal-connected to the temperature detection component and the control valve (23) respectively, is configured to: at the intake temperature T of the second compression section X - The evaporation temperature T of the water vapor S ≤Predetermined temperature T L Close the control valve or reduce the opening of the control valve; and / or, The intake temperature T in the second compression section X - The evaporation temperature T of the water vapor S ≥Preset temperature T H The control valve is opened or its opening degree is increased at the appropriate time.

18. The steam compression heating device according to claim 1, characterized in that, The steam system also includes a steam condenser (13) for condensing steam compressed by the steam compressor (12), a first steam throttling component (14) for throttling the condensed steam, a heat exchanger (10) for evaporating the throttled steam, and a steam flash evaporator (15) connected to the outlet end of the first steam throttling component (14). The steam flash evaporator (15) includes an inlet connected to the first steam throttling component (14), a gas outlet connected to the gas supply port of the steam compressor (12), and a liquid outlet connected to the heat exchanger (10). The steam compressor (12) includes a first compression section and a second compression section for compressing steam after it has been compressed by the first compression section. The air inlet is connected to the intermediate flow path between the first compression section and the second compression section.

19. The steam compression heating device according to claim 1, characterized in that, The refrigerant system includes a negative pressure refrigerant system, and the refrigerant circulating in the negative pressure refrigerant system is a negative pressure refrigerant.

20. The steam compression heating device according to claim 1, characterized in that, The refrigerant circulating in the refrigerant system is R1233zd.

21. A control method for a steam compression heating device according to any one of claims 1 to 20, characterized in that, include: The refrigerant in the refrigerant condenser (3) is delivered to the steam cooling device (25) to cool the steam delivered by the heat exchanger (10) for heating the steam to the air inlet of the steam compressor (12).

22. The control method according to claim 21, characterized in that, include: A steam condenser (13), which is connected to the steam compressor (12) and the heat exchanger (10) respectively, draws a steam stream to inject the steam cooled by the steam cooling device (25) into the air supply port of the steam compressor (12); The suction temperature T of the second compression section of the steam compressor (12), which is used to compress the steam after it has been compressed by the first compression section, is detected. X ; The intake temperature T in the second compression section X - The evaporation temperature T of the water vapor S ≤Predetermined temperature T L Close the control valve used to control the flow rate of steam drawn from the steam condenser (13) or reduce the opening of the control valve; and / or, The intake temperature T in the second compression section X - The evaporation temperature T of the water vapor S ≥Preset temperature T H The control valve is opened or its opening degree is increased at the appropriate time.

23. A control method for a steam compression heating device according to any one of claims 1 to 20, characterized in that, include: A working device that directs a portion of the refrigerant in the refrigerant condenser (3) to the steam system for cooling is provided. The working device includes one or more of the following: driving the steam compressor (12), the steam compressor including a compression device, a drive motor (18) for driving the compression device, a motor control device (19) for controlling the drive motor (18), and an oil cooling device (21) for cooling the lubricating oil supplied to the steam compressor (12). The temperature T of the working device is detected; If the temperature T is greater than the target temperature value T', the greater the difference between the temperature T and the target temperature value T', the greater the opening of the throttling component.

24. The control method according to claim 23, characterized in that, The difference between the temperature T and the target temperature T' is divided into multiple intervals from smallest to largest. Each interval corresponds to the opening degree of a throttling component, and the larger the difference, the larger the opening degree.

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