Waste heat recovery equipment for absorption heat pump of power plant

Abstract

The utility model relates to the technical field of absorption heat pumps, and discloses a power plant absorption heat pump waste heat recovery device which comprises a heat pump assembly, a heat exchange assembly installed on the heat pump assembly and a recovery assembly arranged on the heat exchange assembly, the heat pump assembly comprises a heater, the output end of the heater is communicated with a water pump, and the output end of the water pump is communicated with a mixer. The input end of the mixer is communicated with an expansion valve, the heat exchange assembly comprises a heat exchanger cylinder, a heat exchange pipe is installed in the heat exchanger cylinder, a heat exchanger end socket is arranged at one end of the heat exchanger cylinder, a hot water inlet is formed in the lower end of the heat exchanger end socket, and a hot water outlet is formed in the upper end of the heat exchanger end socket. By arranging the recycling assembly and arranging the recycling water pipe on the outer surface of the heat exchanger barrel, heat generated when the heat exchanger barrel works preheats water used for power generation, and therefore the time for heating boiler water by a power plant is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of absorption heat pumps, in particular to waste heat recovery equipment of absorption heat pumps in power plants. Background Art

[0002] An absorption heat pump is a circulation system that utilizes low-grade heat sources to pump heat from a low-temperature source to a high-temperature source. It is an effective device for recycling low-temperature heat energy, achieving both energy conservation and environmental protection.

[0003] Publication No. CN214665343U discloses an absorption heat pump unit, which includes a generator, a rectifier, a condenser, a subcooler, an evaporator, an absorber, a water-cooled heat exchanger and a solution pump. The rectifier is installed at an angle on the top of the generator. Although this absorption heat pump can improve the overall purification capacity while reducing the occurrence of tower flushing, the heat emitted by the condenser used for cooling during the heat exchange process is not well utilized, resulting in a certain amount of energy waste, which is not in line with the current social concept of energy conservation and environmental protection. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that the heat emitted by the condenser used for cooling in the existing device during the heat exchange process is not well utilized, resulting in a certain amount of energy waste, which is not in line with the current social concept of energy conservation and environmental protection. A power plant absorption heat pump waste heat recovery device is proposed.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a power plant absorption heat pump waste heat recovery device, including a heat pump component, a heat exchange component installed on the heat pump component, and a recovery component provided on the heat exchange component, the heat pump component includes a heater, the heater output end is connected to a water pump, the water pump output end is connected to a mixer, the mixer input end is connected to an expansion valve, the mixer output end is connected to the heater, the heat exchange component includes a heat exchanger cylinder, the lower end of the heat exchanger cylinder is provided with a cold water inlet, the upper end of the heat exchanger cylinder is provided with a cold water outlet, the heat exchanger A base is fixedly connected to the lower bottom surface of the cylinder, a heat exchange tube is installed inside the heat exchanger cylinder, a heat exchanger head is provided at one end of the heat exchanger cylinder, the heat exchanger cylinder and the heat exchanger head are installed together by bolts, a hot water inlet is provided at the lower end of the heat exchanger head, a hot water outlet is provided at the upper end of the heat exchanger head, the hot water inlet is connected to the heater through a pipe, and the hot water outlet is connected to the expansion valve through a pipe. The recovery component includes a recovery water pipe, which is provided on the outer surface of the heat exchanger cylinder, and the outer surface of the recovery water pipe is covered with a protective shell, which is fixedly installed on the outer surface of the heat exchanger cylinder.

[0006] Preferably, a pressure gauge is fixedly connected to the upper end of the heat exchanger cylinder, and a temperature gauge is provided next to the pressure gauge, and the temperature gauge is fixedly installed on the upper surface of the heat exchanger cylinder;

[0007] Used to detect in real time whether the temperature and pressure inside the heat exchanger cylinder meet the standards.

[0008] Preferably, a mounting hole is provided on the base;

[0009] Used to conveniently install the base to the designated location.

[0010] Preferably, the heat exchange tube is designed as a U-shaped tube;

[0011] It is used to increase the heat dissipation area of ​​the U-shaped tube and facilitate the discharge of hot water from the hot water outlet.

[0012] Preferably, a sealing ring is provided on one side of the heat exchanger head, and the sealing ring is a component made of rubber;

[0013] Used to increase the sealing between the heat exchanger cylinder and the heat exchanger head.

[0014] Preferably, a baffle is fixedly connected to the inner wall of the heat exchanger head, and one side of the heat exchange tube abuts against the baffle;

[0015] Used to divide the interior of the heat exchanger head into two independent chambers.

[0016] Preferably, the protective shell is filled with thermal insulation cotton;

[0017] Used to prevent the heat generated by the heat exchanger cylinder from dissipating and causing damage at any time.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The utility model proposes a power plant absorption heat pump waste heat recovery device, which sets a recovery component and a recovery water pipe on the outer surface of the heat exchanger cylinder. The heat generated by the heat exchanger cylinder during operation is used to preheat the water used for power generation, thereby reducing the time for the power plant to heat the boiler water.

[0020] 2. The utility model proposes a power plant absorption heat pump waste heat recovery device, which sets a heat exchange component and uses a baffle to divide the heat exchanger head into two independent chambers. At the same time, the heat exchange tubes are designed into multiple groups and are U-shaped. While increasing the heat exchange area, it can also prevent the heat exchange tubes from being blocked and unable to work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the working principle of the utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of the heat exchange component of the utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of the recovery component and heat exchanger cylinder of the utility model;

[0024] Figure 4 This is a schematic diagram of the overall structure of the heat exchanger cylinder of the utility model;

[0025] Figure 5 This is a schematic diagram of the overall structure of the heat exchanger head of the utility model;

[0026] Figure 6 This is a schematic diagram of the overall structure of the base of the utility model;

[0027] Figure 7 This is an enlarged schematic diagram of point A of the present utility model;

[0028] Legend:

[0029] 1. Heat pump assembly; 11. Heater; 12. Water pump; 13. Mixer; 14. Expansion valve; 2. Heat exchange assembly; 21. Heat exchanger cylinder; 211. Pressure gauge; 212. Thermometer; 22. Cold water inlet; 23. Cold water outlet; 24. Base; 241. Mounting hole; 25. Heat exchange tube; 26. Heat exchanger head; 261. Sealing ring; 262. Baffle; 27. Bolt; 28. Hot water inlet; 29. ​​Hot water outlet; 3. Recovery assembly; 31. Recovery water pipe; 32. Protective shell; 321. Insulation cotton. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference Figure 1-7The utility model provides an embodiment: a power plant absorption heat pump waste heat recovery device, including a heat pump component 1, a heat exchange component 2 is installed on the heat pump component 1, and a recovery component 3 is provided on the heat exchange component 2. The heat pump component 1 includes a heater 11, which heats water and lithium bromide. The output end of the heater 11 is connected to a water pump 12, which delivers high-concentration lithium bromide to a mixer 13. The output end of the water pump 12 is connected to the mixer 13 to mix the cooled water vapor and the high-concentration lithium bromide. The input end of the mixer 13 is connected to the expansion valve 14. When the pressure reaches the set value, the steam in the heat exchanger head 26 enters the mixer 13. The output end of the mixer 13 is connected to the heater 11 to transport the mixed lithium bromide. The heat exchange component 2 includes a heat exchanger barrel 21. The lower end of the heat exchanger barrel 21 is provided with a cold water inlet 22 to facilitate the circulating water to enter the heat exchanger barrel 21. The upper end of the heat exchanger barrel 21 is provided with a cold water outlet 23 to discharge the circulating water in the heat exchanger barrel 21. The bottom surface of the heat exchanger cylinder 21 is fixedly connected with a base 24 to support the heat exchanger cylinder 21. A heat exchange tube 25 is installed inside the heat exchanger cylinder 21 to increase the heat exchange area. A heat exchanger head 26 is provided at one end of the heat exchanger cylinder 21. The heat exchanger cylinder 21 and the heat exchanger head 26 are installed together by bolts 27. A hot water inlet 28 is provided at the lower end of the heat exchanger head 26 to facilitate the access to the hot water in the heater 11. A hot water outlet 29 is provided at the upper end of the heat exchanger head 26 to facilitate the discharge of heat exchanged water. The water in the heat exchanger head 26, the hot water inlet 28 is connected to the heater 11 through a pipe, and the hot water outlet 29 is connected to the expansion valve 14 through a pipe. The recovery component 3 includes a recovery water pipe 31, which uses the heat generated when the heat exchanger cylinder 21 is working to preheat the water used for power generation. The recovery water pipe 31 is arranged on the outer surface of the heat exchanger cylinder 21, and the outer surface of the recovery water pipe 31 is covered with a protective shell 32 to prevent the recovery water pipe 31 from being exposed to the outside. The protective shell 32 is fixedly installed on the outer surface of the heat exchanger cylinder 21.

[0033] A pressure gauge 211 is fixedly connected to the upper end of the heat exchanger cylinder 21, and a temperature gauge 212 is provided next to the pressure gauge 211. The temperature gauge 212 is fixedly mounted on the upper surface of the heat exchanger cylinder 21 to monitor the temperature and pressure inside the heat exchanger cylinder 21 in real time. A mounting hole 241 is provided on the base 24 to facilitate fixing the base 24 to a specified position. The heat exchange tube 25 is designed as a U-shaped tube, which increases the heat exchange area and facilitates the circulation of lithium bromide solution. A sealing ring 261 is provided on one side of the heat exchanger head 26. The sealing ring 261 is a component made of rubber, which increases the sealing between the heat exchanger cylinder 21 and the heat exchanger head 26. A baffle 262 is fixedly connected to the inner wall of the heat exchanger head 26, and one side of the heat exchange tube 25 abuts against the baffle 262 to isolate the interior of the heat exchanger head 26 into two independent chambers. The interior of the protective shell 32 is filled with thermal insulation cotton 321 to prevent heat loss.

[0034] Working principle: First, start the heater 11 to heat the lithium bromide solution and water inside it, then the water boils to generate steam that enters the heat exchanger head 26. The concentrated lithium bromide solution is transported to the mixer 13 through the water pump 12 for standby use. Then the steam is cooled through the heat exchange tube 25 and enters the expansion valve 14. When the pressure reaches the set value, the expansion valve 14 opens, and the steam condenses into water when it is cooled and mixes with the lithium bromide in the mixer 13 and enters the heater 11 to form a cycle. During the heat exchange process, the heat exchanger cylinder 21 absorbs a large amount of heat, thereby preheating the water used for power generation in the recovery water pipe 31, thereby utilizing its heat.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power plant absorption heat pump waste heat recovery device, comprising a heat pump assembly (1), a heat exchange assembly (2) mounted on the heat pump assembly (1), and a recovery assembly (3) disposed on the heat exchange assembly (2), characterized in that: The heat pump assembly (1) includes a heater (11), the output end of the heater (11) is connected to a water pump (12), the output end of the water pump (12) is connected to a mixer (13), the input end of the mixer (13) is connected to an expansion valve (14), and the output end of the mixer (13) is connected to the heater (11). The heat exchange assembly (2) includes a heat exchanger barrel (21), the lower end of the heat exchanger barrel (21) is provided with a cold water inlet (22), the upper end of the heat exchanger barrel (21) is provided with a cold water outlet (23), the lower bottom surface of the heat exchanger barrel (21) is fixedly connected to a base (24), a heat exchange tube (25) is installed inside the heat exchanger barrel (21), and one end of the heat exchanger barrel (21) is provided with a A heat exchanger head (26) is provided. The heat exchanger barrel (21) and the heat exchanger head (26) are mounted together by bolts (27). A hot water inlet (28) is provided at the lower end of the heat exchanger head (26), and a hot water outlet (29) is provided at the upper end of the heat exchanger head (26). The hot water inlet (28) is connected to the heater (11) through a pipeline, and the hot water outlet (29) is connected to the expansion valve (14) through a pipeline. The recovery component (3) includes a recovery water pipe (31). The recovery water pipe (31) is provided on the outer surface of the heat exchanger barrel (21). The outer surface of the recovery water pipe (31) is covered with a protective shell (32). The protective shell (32) is fixedly installed on the outer surface of the heat exchanger barrel (21).

2. The power plant absorption heat pump waste heat recovery equipment according to claim 1, characterized in that: A pressure gauge (211) is fixedly connected to the upper end of the heat exchanger barrel (21), and a temperature gauge (212) is provided next to the pressure gauge (211). The temperature gauge (212) is fixedly installed on the upper surface of the heat exchanger barrel (21).

3. The power plant absorption heat pump waste heat recovery equipment according to claim 1, characterized in that: The base (24) is provided with a mounting hole (241).

4. The power plant absorption heat pump waste heat recovery equipment according to claim 1, characterized in that: The heat exchange tube (25) is designed as a U-shaped tube.

5. The power plant absorption heat pump waste heat recovery equipment according to claim 1, characterized in that: A sealing ring (261) is provided on one side of the heat exchanger head (26), and the sealing ring (261) is a component made of rubber.

6. The power plant absorption heat pump waste heat recovery equipment according to claim 1, characterized in that: A baffle (262) is fixedly connected to the inner wall of the heat exchanger head (26), and one side of the heat exchange tube (25) abuts against the baffle (262).

7. The power plant absorption heat pump waste heat recovery equipment according to claim 1, characterized in that: The interior of the protective shell (32) is filled with thermal insulation cotton (321).

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