High-temperature flue gas source heat pump all-in-one machine

Abstract

The utility model relates to a high-temperature flue gas source heat pump all-in-one machine. According to the technical scheme, a smoke exhaust base is provided with a smoke waste heat recovery evaporator, the upper side of the smoke waste heat recovery evaporator is provided with a smoke inlet base, the other end of a heat pump compressor is connected with the smoke waste heat recovery evaporator through a refrigerant outlet pipe, and a water inlet pipe is connected with a water inlet connector of the smoke waste heat recovery evaporator through a pipeline; a water outlet connector of the flue gas waste heat recovery evaporator is connected to a shell pass inlet of the heat pump heat exchanger through a pipeline, and a shell pass outlet of the heat pump heat exchanger is connected with a water outlet pipe. The heat pump unit has the advantages that the flue gas heat exchange module and high-temperature flue gas are utilized to achieve first-time heat exchange, the flue gas downwards continues to penetrate through the heat pump evaporator module, a heat pump compressor conveys a refrigerant into the heat pump heat exchanger for heat exchange, water subjected to first-time heat exchange through the flue gas heat exchange module is reheated, and the heat exchange efficiency is improved. The temperature needed by a user is achieved, the heat efficiency of the heat pump is improved, and energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to a waste heat utilization device for flue gas source boilers, and particularly to a high-temperature flue gas source heat pump integrated machine. Background Technology

[0002] Currently, in applications such as factories and small-scale centralized heating, flue gas source boilers are still installed to meet the corresponding needs. However, the flue gas exhaust temperature of conventional flue gas source boilers is generally between 120-180 degrees Celsius, which results in the direct release of heat energy from the flue gas into the atmosphere. This not only wastes heat but also exacerbates the urban heat island effect. As environmental protection requirements become increasingly stringent, people are beginning to pay attention to how to utilize this wasted heat. Our company has applied for a Chinese patent entitled "Integrated Low-Temperature Flue Gas Source Heat Pump Device," which discloses a waste heat utilization technology specifically for flue gas source boilers used for low-temperature flue gas. This technology solves the problem of waste heat utilization in low-temperature flue gas source boilers, but it cannot be directly applied to the waste heat utilization of high-temperature flue gas.

[0003] Furthermore, existing technologies mention flue gas heat exchange to recover heat from high-temperature flue gas. This typically involves simply forcibly exhausting the high-temperature flue gas into the heating coil of a water heater. The high-temperature flue gas passes through the heating coil, exchanging heat with the water in the water heater's shell side. This heats the water while simultaneously lowering the flue gas temperature, achieving preheating utilization. However, this method has a problem: while the water temperature in the water heater can be increased, the increase is small and insufficient for direct use; it only serves as preheating. If this hot water is to be used directly, auxiliary heating is required, such as electric heating, which still consumes a lot of energy and cannot be effectively promoted. Alternatively, the water can be recycled back to the boiler for further heating, causing inconvenience and low thermal efficiency. Heat pump technology, as a recognized high-efficiency energy-saving device that can fully utilize low-grade heat energy, can significantly improve thermal efficiency and save energy if the air temperature of its evaporator module can be increased. Therefore, a high-temperature flue gas source heat pump integrated unit can be designed to organically combine flue gas waste heat utilization technology with heat pump technology. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned deficiencies in existing technologies by providing a high-temperature flue gas source heat pump integrated unit. It first utilizes the flue gas heat exchange module in the flue gas waste heat recovery evaporator to achieve a first heat exchange with the high-temperature flue gas, and then utilizes the heat pump's evaporator module to perform a second heat exchange with the flue gas. This significantly improves the utilization rate of the flue gas's heat and also increases the heat pump's thermal efficiency. Furthermore, the water preheated by the flue gas heat exchange module is then further heated by the heat pump, achieving direct application for the user and reducing energy consumption.

[0005] The technical solution of the high-temperature flue gas source heat pump integrated machine mentioned in this utility model is as follows: it includes a base (1), a water storage tank (2), a flue gas inlet seat (5), a flue gas inlet pipe (6), a flue gas outlet pipe (7), an exhaust fan (8), a water inlet pipe (9), a water outlet pipe (10), a heat pump heat exchanger (11), a heat pump compressor (12), an expansion valve (13), a refrigerant inlet pipe (14), a refrigerant outlet pipe (15), and a flue gas outlet seat (17). The water storage tank (2) is installed on one side of the base (1), and the flue gas outlet seat (17) is installed on the water storage tank (2). The flue gas inlet pipe (6) is connected to the upper side of the flue gas inlet seat (5), and the flue gas outlet pipe (7) is connected to the outer side of the flue gas outlet seat (17). An exhaust fan (8) is installed in the middle of the flue gas outlet pipe (7). The heat pump is installed on the other side of the base (1). The heat exchanger (11) and the heat pump compressor (12) are connected at one end to the heat pump heat exchanger (11). The shell-side outlet of the heat pump heat exchanger (11) is connected to the water outlet pipe (10), and the shell-side inlet of the heat pump heat exchanger (11) is connected to the water inlet pipe (9). The heat pump compressor (12) also includes a flue gas waste heat recovery evaporator (4). The flue gas waste heat recovery evaporator (4) is installed on the exhaust seat (17). The exhaust seat (5) is installed on the upper side of the flue gas waste heat recovery evaporator (4). The other end of the heat pump compressor (12) is connected to the flue gas waste heat recovery evaporator (4) through the refrigerant outlet pipe (15). The tube-side outlet of the heat pump heat exchanger (11) is connected to the flue gas waste heat recovery evaporator (4) through the refrigerant inlet pipe (14) and the expansion valve (13).

[0006] Preferably, the flue gas waste heat recovery evaporator (4) described above is equipped with a flue gas heat exchange module and a heat pump evaporator module. The flue gas heat exchange module includes a flue gas heat exchange tube (4.2), an outlet water connecting pipe (4.3), an outlet water connector (4.4), an inlet water connector (4.5), and an inlet water connecting pipe (4.6). The outer end of the flue gas heat exchange tube (4.2) is connected to the outlet water connecting pipe (4.3) and the inlet water connecting pipe (4.6) respectively. The outlet water connector (4.4) is installed on the outside of the outlet water connecting pipe (4.3), and the inlet water connector (4.5) is installed on the outside of the inlet water connecting pipe (4.6).

[0007] Preferably, the heat pump evaporator module includes an evaporator heat exchange tube (4.7), a refrigerant inlet (4.8), and a refrigerant outlet connecting pipe (4.9). The inlet end of the evaporator heat exchange tube (4.7) is provided with a refrigerant inlet (4.8), and the outlet end is connected to the refrigerant outlet connecting pipe (4.9).

[0008] Preferably, the flue gas heat exchange tube (4.2) is made of multiple sets of U-shaped heat exchange tubes, with the open ends of the U-shaped heat exchange tubes welded to the inner walls of the outlet water connecting pipe (4.3) and the inlet water connecting pipe (4.6), respectively.

[0009] Preferably, the above-mentioned heat pump evaporator modules are used in more than one set.

[0010] Preferably, a water storage tank drain pipe (16) is installed on the outer wall of the aforementioned water storage tank (2).

[0011] Preferably, the lower end of the smoke inlet seat (5) is provided with a smoke exhaust seat drain pipe (18), and the smoke exhaust seat drain pipe (18) is a bent pipe structure.

[0012] Preferably, a support frame (3) is installed on the other side of the base (1), and one or more heat pump heat exchangers (11) are installed on the upper side of the support frame (3), and a heat pump compressor (12) is installed between the support frame (3) and the base (1).

[0013] The beneficial effects of this utility model are as follows: This utility model first utilizes the flue gas heat exchange module in the flue gas waste heat recovery evaporator to achieve the first heat exchange with the high-temperature flue gas from the flue gas source boiler. The flue gas then continues to pass downward through the heat pump evaporator module and exchanges heat with the refrigerant from the refrigerant inlet pipe. The refrigerant that has absorbed heat is then sent to the heat pump compressor through the refrigerant outlet pipe. The heat pump compressor then sends the high-temperature and high-pressure refrigerant into the heat pump heat exchanger for heat exchange, reheating the water that has completed the first heat exchange in the flue gas heat exchange module to reach the temperature required by the user. This also improves the thermal efficiency of the heat pump, reduces energy consumption, and realizes the recovery of flue gas preheating. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model connected to a flue gas source boiler;

[0016] Figure 3 This is a schematic diagram of the external appearance of this utility model;

[0017] Figure 4 This is a schematic diagram of the flue gas connection for the flue gas waste heat recovery evaporator section;

[0018] Figure 5 This is a side view of the flue gas waste heat recovery evaporator section.

[0019] In the diagram above: 1. Base; 2. Water storage tank; 3. Support frame; 4. Flue gas waste heat recovery evaporator; 5. Smoke inlet seat; 6. Smoke inlet pipe; 7. Smoke exhaust pipe; 8. Exhaust fan; 9. Water inlet pipe; 10. Water outlet pipe; 11. Heat pump heat exchanger; 12. Heat pump compressor; 13. Expansion valve; 14. Refrigerant inlet pipe; 15. Refrigerant outlet pipe; 16. Water storage tank drain pipe; 17. Smoke exhaust seat; 18. Smoke exhaust seat drain pipe; 19. Main exhaust pipe; 20. Flue gas source boiler; 21. Outer shell.

[0020] Evaporator shell 4.1, flue gas heat exchange tube 4.2, water outlet connecting pipe 4.3, water outlet connector 4.4, water inlet connector 4.5, water inlet connecting pipe 4.6, evaporator heat exchange tube 4.7, refrigerant inlet 4.8, and refrigerant outlet connecting pipe 4.9. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example 1, referring to Figures 1-5 The present invention relates to a high-temperature flue gas source heat pump integrated unit, the technical solution of which includes: a base 1, a water storage tank 2, a flue gas inlet seat 5, a flue gas inlet pipe 6, a flue gas exhaust pipe 7, an exhaust fan 8, a water inlet pipe 9, a water outlet pipe 10, a heat pump heat exchanger 11, a heat pump compressor 12, an expansion valve 13, a refrigerant inlet pipe 14, a refrigerant outlet pipe 15, and a flue gas exhaust seat 17. The water storage tank 2 is installed on one side of the base 1, and the flue gas exhaust seat 17 is installed on the water storage tank 2. The flue gas inlet pipe 6 is connected to the upper side of the flue gas inlet seat 5, and the flue gas exhaust pipe 7 is connected to the outer side of the flue gas exhaust seat 17. An exhaust fan 8 is installed in the middle of the flue gas exhaust pipe 7. The heat pump heat exchanger 11 is installed on the other side of the base 1. The system includes a heat pump compressor 12, one end of which is connected to a heat pump heat exchanger 11. The shell-side outlet of the heat pump heat exchanger 11 is connected to a water outlet pipe 10, and the shell-side inlet of the heat pump heat exchanger 11 is connected to a water inlet pipe 9. The system also includes a flue gas waste heat recovery evaporator 4, which is installed on the exhaust gas seat 17. An exhaust gas seat 5 is installed on the upper side of the flue gas waste heat recovery evaporator 4. The other end of the heat pump compressor 12 is connected to the flue gas waste heat recovery evaporator 4 through a refrigerant outlet pipe 15. The tube-side outlet of the heat pump heat exchanger 11 is connected to the flue gas waste heat recovery evaporator 4 through a refrigerant inlet pipe 14 and an expansion valve 13.

[0023] Reference Figure 5 The flue gas waste heat recovery evaporator 4 mentioned in this utility model is equipped with a flue gas heat exchange module and a heat pump evaporator module. The flue gas heat exchange module includes a flue gas heat exchange tube 4.2, an outlet water connecting pipe 4.3, an outlet water connector 4.4, an inlet water connector 4.5, and an inlet water connecting pipe 4.6. The outer end of the flue gas heat exchange tube 4.2 is connected to the outlet water connecting pipe 4.3 and the inlet water connecting pipe 4.6 respectively. The outlet water connector 4.4 is installed on the outer side of the outlet water connecting pipe 4.3, and the inlet water connector 4.5 is installed on the outer side of the inlet water connecting pipe 4.6, so that water can be sent to the flue gas heat exchange module for preheating, making full use of the heat of high-temperature flue gas.

[0024] In addition, the aforementioned heat pump evaporator module includes an evaporator heat exchange tube 4.7, a refrigerant inlet 4.8, and a refrigerant outlet connecting pipe 4.9. The inlet end of the evaporator heat exchange tube 4.7 is provided with a refrigerant inlet 4.8, and the outlet end is connected to the refrigerant outlet connecting pipe 4.9.

[0025] The flue gas heat exchange tube 4.2 mentioned above is made of multiple sets of U-shaped heat exchange tubes, and the open ends of the U-shaped heat exchange tubes are welded to the inner walls of the outlet water connecting pipe 4.3 and the inlet water connecting pipe 4.6 respectively.

[0026] In addition, a water storage tank drain pipe 16 is installed on the outer wall of the aforementioned water storage tank 2 to drain the condensate formed inside the outer shell 21.

[0027] The lower end of the aforementioned smoke inlet seat 5 is provided with a smoke exhaust seat drain pipe 18, and the smoke exhaust seat drain pipe 18 has a bent pipe structure, which is used to discharge the condensate formed in the flue gas waste heat recovery evaporator 4, and the bent pipe structure can achieve the function of water seal.

[0028] Reference Figure 3 The outer casing 21 is installed on the outside of the entire device. The top of the casing 21 has an outlet for the exhaust pipe 7, and one end has an outlet for the inlet pipe 6, a water tank drain pipe 16, and an exhaust seat drain pipe 18. The side wall of the casing 21 has interfaces for the inlet pipe 9 and the outlet pipe 10.

[0029] In use, the outer end of the exhaust pipe 7 is connected to the upper side of the main exhaust pipe 19, and the outer end of the inlet pipe 6 is connected to the lower middle side of the main exhaust pipe 19. The main exhaust pipe 19 connects to the exhaust port of the flue gas source boiler 20. After the high-temperature flue gas generated by the flue gas source boiler 20 is discharged, it is drawn into the inlet seat 5 through the inlet pipe 6 by the exhaust fan 8. Then, it flows downwards along the flue gas waste heat recovery evaporator 4, undergoes a first heat exchange with water from the inlet pipe 9 via the flue gas heat exchange module, and then... Continuing downwards through the heat pump evaporator module, it exchanges heat with the refrigerant from the refrigerant inlet pipe 14. After absorbing heat, the refrigerant is sent to the heat pump compressor 12 through the refrigerant outlet pipe 15. The heat pump compressor 12 then sends the high-temperature and high-pressure refrigerant to the heat pump heat exchanger 11 for heat exchange, reheating the water that has completed the first heat exchange in the flue gas heat exchange module to reach the temperature required by the user. The hot water is sent to the user through the water outlet pipe 10, while the refrigerant is recirculated to the heat pump evaporator module through the refrigerant outlet pipe 15 and the expansion valve 13.

[0030] Example 2: A high-temperature flue gas source heat pump integrated unit mentioned in this utility model includes a base 1, a water storage tank 2, a flue gas waste heat recovery evaporator 4, a flue gas inlet seat 5, a flue gas inlet pipe 6, a flue gas exhaust pipe 7, an exhaust fan 8, a water inlet pipe 9, a water outlet pipe 10, a heat pump heat exchanger 11, a heat pump compressor 12, an expansion valve 13, a refrigerant inlet pipe 14, a refrigerant outlet pipe 15, and a flue gas exhaust seat 17. The water storage tank 2 is installed on one side of the base 1, and the flue gas exhaust seat 17 is installed on the water storage tank 2. The flue gas waste heat recovery evaporator 4 is installed on the flue gas exhaust seat 17, and the flue gas inlet seat 5 is installed on the upper side of the flue gas waste heat recovery evaporator 4. The side of the base 1 is connected to the flue gas inlet pipe 6, and the outside of the flue gas base 17 is connected to the flue gas exhaust pipe 7, and the middle of the flue gas exhaust pipe 7 is installed with an exhaust fan 8; the other side of the base 1 is equipped with a heat pump heat exchanger 11 and a heat pump compressor 12, and one end of the heat pump compressor 12 is connected to the flue gas waste heat recovery evaporator 4 through the refrigerant outlet pipe 15, and the other end is connected to the heat pump heat exchanger 11. The tube side outlet of the heat pump heat exchanger 11 is connected to the flue gas waste heat recovery evaporator 4 through the refrigerant inlet pipe 14 and the expansion valve 13. The shell side outlet of the heat pump heat exchanger 11 is connected to the water outlet pipe 10, and the shell side inlet of the heat pump heat exchanger 11 is connected to the water inlet pipe 9.

[0031] The difference from Example 1 is:

[0032] The heat pump evaporator module mentioned in this embodiment can be one or more sets. Multiple sets of heat pump evaporator modules can be set according to the needs of the site and connected to the heat pump compressor 12 to meet the needs of high-power heating.

[0033] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A high-temperature flue gas source heat pump integrated unit, comprising a base (1), a water storage tank (2), a flue gas inlet seat (5), a flue gas inlet pipe (6), a flue gas outlet pipe (7), an exhaust fan (8), a water inlet pipe (9), a water outlet pipe (10), a heat pump heat exchanger (11), a heat pump compressor (12), an expansion valve (13), a refrigerant inlet pipe (14), a refrigerant outlet pipe (15), and a flue gas outlet seat (17). The water storage tank (2) is installed on one side of the base (1), and the flue gas outlet seat (17) is installed on the water storage tank (2). The flue gas inlet pipe (6) is connected to the upper side of the flue gas inlet seat (5), and the flue gas outlet pipe (7) is connected to the outer side of the flue gas outlet seat (17). An exhaust fan (8) is installed in the middle of the flue gas outlet pipe (7). The heat pump heat exchanger (11) and the heat pump compressor (12) are installed on the other side of the base (1). One end of the heat pump compressor (12) is connected to the heat pump heat exchanger (11). The unit is characterized in that: It also includes a flue gas waste heat recovery evaporator (4), which is installed on the exhaust seat (17). A flue gas waste heat recovery evaporator (4) is installed on the upper side of the flue gas waste heat recovery evaporator (4). The other end of the heat pump compressor (12) is connected to the flue gas waste heat recovery evaporator (4) through a refrigerant outlet pipe (15). The tube-side outlet of the heat pump heat exchanger (11) is connected to the flue gas waste heat recovery evaporator (4) through a refrigerant inlet pipe (14) and an expansion valve (13). The water inlet pipe (9) is connected to the water inlet connector (4.5) of the flue gas waste heat recovery evaporator (4) through a pipeline. The water outlet connector (4.4) of the flue gas waste heat recovery evaporator (4) is connected to the shell-side inlet of the heat pump heat exchanger (11) through a pipeline. The shell-side outlet of the heat pump heat exchanger (11) is connected to the water outlet pipe (10).

2. The high-temperature flue gas source heat pump integrated unit according to claim 1, characterized in that: The flue gas waste heat recovery evaporator (4) is equipped with a flue gas heat exchange module and a heat pump evaporator module. The flue gas heat exchange module includes a flue gas heat exchange tube (4.2), an outlet water connecting pipe (4.3), an outlet water connector (4.4), an inlet water connector (4.5), and an inlet water connecting pipe (4.6). The outer end of the flue gas heat exchange tube (4.2) is connected to the outlet water connecting pipe (4.3) and the inlet water connecting pipe (4.6) respectively. The outlet water connector (4.4) is installed on the outside of the outlet water connecting pipe (4.3), and the inlet water connector (4.5) is installed on the outside of the inlet water connecting pipe (4.6).

3. The high-temperature flue gas source heat pump integrated unit according to claim 2, characterized in that: The heat pump evaporator module includes an evaporator heat exchange tube (4.7), a refrigerant inlet (4.8), and a refrigerant outlet connecting pipe (4.9). The inlet end of the evaporator heat exchange tube (4.7) is provided with a refrigerant inlet (4.8), and the outlet end is connected to the refrigerant outlet connecting pipe (4.9).

4. A high-temperature flue gas source heat pump integrated unit according to claim 2 or 3, characterized in that: The flue gas heat exchange tube (4.2) is made of multiple sets of U-shaped heat exchange tubes, and the open ends of the U-shaped heat exchange tubes are welded to the inner walls of the outlet water connecting pipe (4.3) and the inlet water connecting pipe (4.6), respectively.

5. A high-temperature flue gas source heat pump integrated unit according to claim 4, characterized in that: The heat pump evaporator module described herein is used in more than one set.

6. The high-temperature flue gas source heat pump integrated unit according to claim 4, characterized in that: A water storage tank drain pipe (16) is installed on the outer wall of the water storage tank (2).

7. A high-temperature flue gas source heat pump integrated unit according to claim 4, characterized in that: The lower end of the smoke inlet seat (5) is provided with a smoke exhaust seat drain pipe (18), and the smoke exhaust seat drain pipe (18) is a bent pipe structure.

8. The high-temperature flue gas source heat pump integrated unit according to claim 1, characterized in that: A support frame (3) is installed on the other side of the base (1), and one or more heat pump heat exchangers (11) are installed on the upper side of the support frame (3). A heat pump compressor (12) is installed between the support frame (3) and the base (1).

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