Water source heat pump direct-outlet steam unit

Abstract

The utility model relates to the field of water source heat pump steam engines, in particular to a water source heat pump direct outlet steam engine unit which comprises a heat pump cycle and a first water cycle, the heat pump cycle comprises a heat pump compressor, a steam generator, a liquid storage device, a first throttling device and a second throttling device, and the first water cycle comprises a make-up pump and a second gas-liquid separator. Through the arrangement, the mode that a heat pump and a flash tank are used for heating to generate water vapor can be replaced, the energy loss is reduced, the additional occupied area due to the arrangement of the flash tank is reduced, heat in the waste heat water path is recycled through the arrangement of heat pump circulation, and the cost for generating the water vapor is reduced.

Description

Technical Field

[0001] The utility model relates to the field of water source heat pump steam engines, in particular to a water source heat pump direct steam generating unit. Background Art

[0002] 50% - 70% of industrial energy consumption in China is consumed in the form of heat energy, most of which is high-temperature heat energy demand above 80°C. Traditional high-temperature heating uses coal-fired, oil-fired, gas-fired boilers or electric boilers, etc., which have problems such as low efficiency and high pollution. Moreover, more than half of the heat energy is converted into waste heat in the form of waste gas and waste water after use, and a large amount of waste heat is directly discharged, resulting in waste.

[0003] As an efficient and clean heating method, water source heat pump can recover and reuse waste heat in the process, thus greatly saving energy consumption and related carbon dioxide emissions. The common technical solution for water source heat pump to produce steam is to use a high-temperature water source heat pump to produce high-temperature hot water at 85°C - 140°C, and then use the negative pressure / micro-pressure flashing of a flash tank to produce steam. The existing technical solution is to indirectly produce steam, and the system needs to be equipped with a flash tank, resulting in low efficiency, high cost and large floor area. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects in the prior art that the use of a flash tank leads to high cost, low efficiency and large floor area for steam production, and to provide a water source heat pump direct steam generating unit.

[0005] The utility model provides a water source heat pump direct steam generating unit, which includes a heat pump cycle and a first water cycle;

[0006] The heat pump cycle includes a heat pump compressor, a steam generator, a liquid storage tank, a first throttling device, an evaporator, a first gas-liquid separator and a second throttling device. The heat pump compressor, the steam generator and the liquid storage tank are connected in sequence. The outlet of the liquid storage tank is respectively connected to the inlet of the first throttling device and the inlet of the second throttling device. The outlet of the second throttling device is connected to the air supplement port of the heat pump compressor. The first throttling device, the evaporator and the first gas-liquid separator are connected in sequence. The outlet of the first gas-liquid separator is connected to the suction port of the heat pump compressor. The steam generator is used for heat exchange with the first water cycle, and the evaporator is also connected to the surplus hot water path and is used for heat exchange with the surplus hot water path;

[0007] The first water cycle includes a make-up water pump and a second gas-liquid separator that are connected in sequence to form a circulation loop. The first water cycle exchanges heat with the steam generator through a channel connecting the make-up water pump and the second gas-liquid separator. A heating device is provided inside the second gas-liquid separator, and a steam valve is provided on the second gas-liquid separator. The steam valve is used to output steam.

[0008] The water source heat pump direct steam unit further includes a second water cycle;

[0009] The second water cycle includes a circulation water pump and the second gas-liquid separator that are connected in sequence to form a circulation loop.

[0010] By setting up the second water cycle, the water is reheated to generate steam, thereby improving the efficiency of steam generation.

[0011] The working medium is compressed by the heat pump compressor and then exchanges heat and releases heat with the first water cycle and the second water cycle through the steam generator. Then it passes through the liquid storage tank to reach the economizer. After further heat exchange and splitting through the economizer, the gaseous working medium passes through the second throttling device and returns to the economizer, and then enters the heat pump compressor from the air supplement port of the compressor. The liquid working medium passes through the first throttling device and enters the evaporator to absorb the heat of the surplus hot water path and evaporates into a gas to continue working in the heat pump cycle, and returns to the heat pump compressor through the first gas-liquid separator. Through this setting, heat exchange of the surplus hot water path can be carried out, improving the utilization efficiency of the heat of the surplus hot water; by using the steam generator to exchange heat with the first water cycle, the water can be preheated; by setting up a heating device, the heating device is used to heat the water in the second gas-liquid separator to a certain temperature before the start of the steam unit so that the unit can start normally; by setting up a steam valve, the water vapor generated by the second water cycle can be output. By setting up the steam generator and the second gas-liquid separator, the use of a flash tank for heating to generate water vapor is replaced, improving the heat exchange efficiency and reducing the working area of the unit occupied by setting up the flash tank. By using the evaporator for heat exchange, the heat in the surplus hot water path is recycled, reducing the cost of generating water vapor.

[0012] The heat pump cycle further includes an economizer. The liquid storage tank and the economizer are connected in sequence. The economizer includes a first inlet, a second inlet, a first outlet, and a second outlet. The outlet of the liquid storage tank is connected to the first inlet of the economizer. The first outlet of the economizer is respectively connected to the inlet of the first throttling device and the inlet of the second throttling device. The second inlet of the economizer is connected to the outlet of the second throttling device. The second outlet of the economizer is connected to the air supplement port of the heat pump compressor.

[0013] The heat pump compressor is a scroll compressor or a screw compressor or a centrifugal compressor, etc.

[0014] The working medium in the heat pump cycle is R245fa, or the working medium can be set as R1233zd(E).

[0015] A liquid level monitoring device is also provided in the second gas-liquid separator. The liquid level monitoring device is used to monitor the water level in the second gas-liquid separator. The liquid level monitoring device is a float-type liquid level monitor, or the liquid level monitoring device can be set as an ultrasonic liquid level sensor. A temperature detection device is also provided in the second gas-liquid separator. The temperature detection device is used to detect the temperature in the second gas-liquid separator.

[0016] The economizer can be a plate heat exchanger or a shell-and-tube heat exchanger.

[0017] The valve types adopted by the first throttling device and the second throttling device are both electronic expansion valves or capillaries.

[0018] The heating device is a heating rod or an electric heater, etc.

[0019] Furthermore, the steam generator can also be provided with a working medium inlet, a working medium outlet, a circulating water outlet, a circulating water inlet, a makeup water outlet, and a makeup water inlet.

[0020] The working medium inlet is used to connect with the heat pump compressor. The working medium outlet is used to connect with the liquid receiver. The circulating water outlet and the makeup water outlet are both used to connect with the second gas-liquid separator. The circulating water inlet is used to connect with the circulating water pump. The makeup water inlet is used to connect with the makeup water pump.

[0021] The makeup water inlet and the makeup water outlet are communicated through at least one detour pipeline. The circulating water inlet and the circulating water outlet are communicated through at least one detour pipeline.

[0022] During use, start the makeup water pump to supply water to the second gas-liquid separator. When the liquid level monitor detects that the water level in the second gas-liquid separator reaches the preset value, start the electric heater and turn off the makeup water pump. When the water temperature in the second gas-liquid separator reaches the preset value, start the circulating water pump and the heat pump compressor in sequence, turn off the electric heater, adjust the opening of the steam valve, and start the makeup water pump again after the unit stably outputs steam.

[0023] Compared with the prior art, the beneficial effects of the present utility model are:

[0024] 1. The utility model provides a water source heat pump direct steam unit, which includes a heat pump cycle and a first water cycle. The heat pump cycle includes a heat pump compressor, a steam generator, a liquid storage tank, a first throttling device, and a second throttling device. The first water cycle includes a make-up water pump and a second gas-liquid separator. Through this setting, the use of a flash tank for heating to generate water vapor is replaced, reducing the working area of the unit occupied by setting up the flash tank. By using the evaporator for heat exchange, the heat in the surplus hot water circuit is recycled, reducing the cost of generating water vapor. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the water source heat pump direct steam unit according to Embodiment 1 provided by the utility model.

[0026] Figure 2 It is a schematic structural diagram of the steam generator according to Embodiment 2 provided by the utility model.

[0027] Markings in the figure:

[0028] 1 - Heat pump compressor, 2 - Steam generator, 21 - Working medium inlet, 22 - Working medium outlet, 23 - Circulating water outlet, 24 - Circulating water inlet, 25 - Make-up water outlet, 26 - Make-up water inlet, 3 - Liquid storage tank, 4 - Economizer, 5 - First throttling device, 6 - Evaporator, 7 - First gas-liquid separator, 8 - Second throttling device, 9 - Make-up water pump, 10 - Second gas-liquid separator, 11 - Circulating water pump, 12 - Steam valve, 13 - Liquid level monitoring device, 14 - Heating device. Specific Embodiments

[0029] The following further describes the present utility model in detail with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. Any technology implemented based on the content of the present utility model belongs to the scope of the present utility model.

[0030] Embodiment 1

[0031] As Figure 1 shown, the utility model provides a water source heat pump direct steam unit, which includes a heat pump cycle and a first water cycle;

[0032] The heat pump cycle includes a heat pump compressor 1, a steam generator 2, a liquid reservoir 3, a first throttling device 5, an evaporator 6, a first gas-liquid separator 7, and a second throttling device 8. The heat pump compressor 1, the steam generator 2, and the liquid reservoir 3 are connected in sequence. The outlet of the liquid reservoir 3 is respectively connected to the inlet of the first throttling device 5 and the inlet of the second throttling device 8. The outlet of the second throttling device 8 is connected to the gas supplement port of the heat pump compressor 1. The first throttling device 5, the evaporator 6, and the first gas-liquid separator 7 are connected in sequence. The outlet of the first gas-liquid separator 7 is connected to the suction port of the heat pump compressor 1. The steam generator 2 is used for heat exchange with the first water cycle. The evaporator 6 is also connected to the surplus hot water circuit, and the evaporator 6 is used for heat exchange with the surplus hot water circuit;

[0033] The first water cycle includes a make-up water pump 9 and a second gas-liquid separator 10 that are connected in sequence to form a circulation loop. The first water cycle exchanges heat with the steam generator 2 through a channel connecting the make-up water pump 9 and the second gas-liquid separator 10. A heating device 14 is provided inside the second gas-liquid separator 10, and a steam valve 12 is provided on the second gas-liquid separator 10. The steam valve 12 is used to output steam;

[0034] The water source heat pump direct steam unit further includes a second water cycle;

[0035] The second water cycle includes a circulation water pump 11 and the second gas-liquid separator 10 that are connected in sequence to form a circulation loop.

[0036] By setting up the second water cycle, the water is reheated to generate steam, thereby improving the efficiency of steam generation.

[0037] After the working fluid is compressed by the heat pump compressor 1, it exchanges heat and releases heat with the first water cycle and the second water cycle through the steam generator 2, then reaches the liquid receiver 3 and arrives at the economizer 4. After further heat exchange and flow splitting through the economizer 4, the gaseous working fluid returns to the economizer 4 through the second throttling device 8 and is input into the heat pump compressor 1 from the gas supplement port of the compressor. The liquid working fluid passes through the first throttling device 5 and enters the evaporator 6 to absorb the heat of the surplus hot water circuit and evaporates into gas to continue working in the heat pump cycle, and returns to the heat pump compressor 1 through the first gas-liquid separator 7. Through this setting, heat exchange with the surplus hot water circuit can be carried out, improving the utilization efficiency of the heat of the surplus hot water; by using the steam generator 2 to exchange heat with the first water cycle, the water can be preheated; by setting the heating device 14, the heating device 14 is used to heat the water in the second gas-liquid separator 10 to a certain temperature before the steam unit starts, so that the unit can start normally; by setting the steam valve 12, the water vapor generated by the second water cycle can be output. By setting the steam generator 2 and the second gas-liquid separator 10, the use of a flash tank for heating to generate water vapor is replaced, improving the heat exchange efficiency and reducing the working area of the unit occupied by setting the flash tank. By using the evaporator 6 for heat exchange, the heat in the surplus hot water circuit is recovered and utilized, reducing the cost of generating water vapor.

[0038] The heat pump cycle further includes an economizer 4. The liquid receiver 3 and the economizer 4 are connected in sequence. The economizer 4 includes a first inlet, a second inlet, a first outlet and a second outlet. The outlet of the liquid receiver 3 is connected to the first inlet of the economizer 4. The first outlet of the economizer 4 is respectively connected to the inlet of the first throttling device 5 and the inlet of the second throttling device 8. The second inlet of the economizer 4 is connected to the outlet of the second throttling device 8. The second outlet of the economizer 4 is connected to the gas supplement port of the heat pump compressor 1.

[0039] The heat pump compressor 1 is a scroll compressor, and the working fluid in the heat pump cycle is R245fa.

[0040] A liquid level monitoring device 13 is further provided in the second gas-liquid separator 10. The liquid level monitoring device 13 is used to monitor the water level of the second gas-liquid separator 10. The liquid level monitoring device 13 is a float type liquid level monitor. A temperature detection device is further provided in the second gas-liquid separator 10. The temperature detection device is used to detect the temperature in the second gas-liquid separator 10.

[0041] The economizer 4 is a plate heat exchanger. The valve types of the first throttling device 5 and the second throttling device 8 are both electronic expansion valves or capillaries. The heating device 14 is a heating rod, and the temperature detection device is an electronic temperature detector. Further, the steam generator 2 is further provided with a working medium inlet 21, a working medium outlet 22, a circulating water outlet 23, a circulating water inlet 24, a makeup water outlet 25, and a makeup water inlet 26.

[0042] The working medium inlet 21 is used to connect with the heat pump compressor 1. The working medium outlet 22 is used to connect with the liquid receiver 3. Both the circulating water outlet 23 and the makeup water outlet 25 are used to connect with the second gas-liquid separator 10. The circulating water inlet 24 is used to connect with the circulating water pump 11. The makeup water inlet 26 is used to connect with the makeup water pump 9.

[0043] The makeup water inlet 26 and the makeup water outlet 25 are communicated through a tortuous pipeline. The circulating water inlet 24 and the circulating water outlet 23 are communicated through a tortuous pipeline.

[0044] During use, turn on the makeup water pump 9 to supply water to the second gas-liquid separator 10. When the liquid level monitor detects that the water level in the second gas-liquid separator 10 reaches the preset value, turn on the electric heater and turn off the makeup water pump 9. When the water temperature in the second gas-liquid separator 10 reaches the preset value, turn on the circulating water pump 11 and the heat pump compressor 1 in sequence, turn off the electric heater, adjust the opening degree of the steam valve 12, and turn on the makeup water pump 9 again after the unit stably outputs steam.

[0045] Embodiment 2

[0046] As Figure 2 shown, the difference between this embodiment and Embodiment 1 is that the steam generator 2 is provided with a working medium inlet 21, a working medium outlet 22, a circulating water outlet 23, a circulating water inlet 24, a makeup water outlet 25, and a makeup water inlet 26.

[0047] The working medium inlet 21 is used to connect with the heat pump compressor 1. The working medium outlet 22 is used to connect with the liquid receiver 3. Both the circulating water outlet 23 and the makeup water outlet 25 are used to connect with the second gas-liquid separator 10. The circulating water inlet 24 is used to connect with the circulating water pump 11. The makeup water inlet 26 is used to connect with the makeup water pump 9.

[0048] The makeup water inlet 26 and the makeup water outlet 25 are communicated through 1 tortuous pipeline. The circulating water inlet 24 and the circulating water outlet 23 are communicated through 2 tortuous pipelines.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water source heat pump direct steam unit, characterized in that, It includes a heat pump cycle and a first water cycle; The heat pump cycle includes a heat pump compressor (1), a steam generator (2), a liquid storage tank (3), a first throttling device (5), an evaporator (6), a first gas-liquid separator (7) and a second throttling device (8). The heat pump compressor (1), the steam generator (2) and the liquid storage tank (3) are connected in sequence. The outlet of the liquid storage tank (3) is respectively connected to the inlet of the first throttling device (5) and the inlet of the second throttling device (8). The outlet of the second throttling device (8) is connected to the gas supplement port of the heat pump compressor (1). The first throttling device (5), the evaporator (6) and the first gas-liquid separator (7) are connected in sequence. The outlet of the first gas-liquid separator (7) is connected to the suction port of the heat pump compressor (1). The steam generator (2) is used for heat exchange with the first water cycle. The evaporator (6) is also connected to the surplus hot water path, and the evaporator (6) is used for heat exchange with the surplus hot water path; The first water cycle includes a make-up water pump (9) and a second gas-liquid separator (10) which are connected in sequence to form a circulation loop. The first water cycle exchanges heat with the steam generator (2) through the channel connecting the make-up water pump (9) and the second gas-liquid separator (10). A heating device (14) is provided in the second gas-liquid separator (10). The second gas-liquid separator (10) is provided with a steam valve (12), and the steam valve (12) is used for outputting steam.

2. The water source heat pump direct steam unit according to claim 1, characterized in that, It also includes a second water cycle; The second water cycle includes a circulation water pump (11) and the second gas-liquid separator (10) which are connected in sequence to form a circulation loop.

3. The water source heat pump direct steam unit according to claim 1, characterized in that, The heat pump cycle also includes an economizer (4). The liquid storage tank (3) and the economizer (4) are connected in sequence. The economizer (4) includes a first inlet, a second inlet, a first outlet and a second outlet. The outlet of the liquid storage tank (3) is connected to the first inlet of the economizer (4). The first outlet of the economizer (4) is respectively connected to the inlet of the first throttling device (5) and the inlet of the second throttling device (8). The second inlet of the economizer (4) is connected to the outlet of the second throttling device (8). The second outlet of the economizer (4) is connected to the gas supplement port of the heat pump compressor (1).

4. A water source heat pump direct steam unit according to any one of claims 1 to 3, characterized in that, The heat pump compressor (1) is a scroll compressor or a screw compressor or a centrifugal compressor.

5. A direct steam output water source heat pump unit according to claim 4, characterized in that, The working medium in the heat pump cycle is R245fa or R1233zd(E).

6. The water source heat pump direct steam unit according to claim 4, characterized in that, A liquid level monitoring device (13) is also provided in the second gas-liquid separator (10). The liquid level monitoring device (13) is used for monitoring the water level of the second gas-liquid separator (10). The liquid level monitoring device (13) is a float type liquid level monitor or an ultrasonic liquid level sensor. A temperature detection device is also provided in the second gas-liquid separator (10). The temperature detection device is used for detecting the temperature in the second gas-liquid separator (10).

7. A direct steam output water source heat pump unit according to claim 3, characterized in that, The economizer (4) adopts a plate heat exchanger or a shell-and-tube heat exchanger.

8. A water source heat pump direct steam generating unit according to claim 4, characterized in that, The valve types adopted by the first throttling device (5) and the second throttling device (8) are both electronic expansion valves or capillary tubes.

9. A direct steam output water source heat pump unit according to claim 4, characterized in that, The heating device (14) is a heating rod or an electric heater, and the heating device (14) is used to heat the water in the second gas-liquid separator (10) so that the heat pump steam unit can be started normally.

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