Flue gas source heat pump system

Abstract

The utility model discloses a flue gas source heat pump system and relates to the technical field of heat pump systems. The flue gas source heat pump system comprises a first heat exchanger, a compressor, a condenser and an expansion valve. The first heat exchanger is provided with a smoke inlet and a smoke outlet, the first heat exchanger, the compressor, the condenser and the expansion valve form a circulation loop through a connecting pipeline, the first heat exchanger receives medium-high-temperature smoke, a refrigerant is heated through heat exchange, the refrigerant is changed into high-temperature low-pressure gas, and the high-temperature low-pressure gas enters the compressor through the connecting pipeline. The compressor works to convert high-temperature and low-pressure gas into high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters the condenser and exchanges heat with cold water to become medium-temperature and high-pressure liquid, then the medium-temperature and high-pressure liquid forms low-temperature and low-pressure gas through the expansion valve, and the The process not only improves the energy utilization efficiency, but also reduces the original emission temperature of the flue gas, and is beneficial to environmental protection; and after heat exchange, the temperature of the flue gas is obviously reduced, and convenient conditions are provided for subsequent flue gas treatment or emission.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump systems, and more specifically to a flue gas source heat pump system. Background Art

[0002] In the current industrial production process, combustion and heating steps are indispensable. However, these processes are often accompanied by the generation of a large amount of flue gas, which is usually at a high temperature. If it is directly discharged into the atmosphere, it will not only cause a large amount of energy waste, but also cause thermal pollution and greenhouse gas emissions to the environment.

[0003] In order to recover the waste heat of flue gas in industrial production, the flue gas can be directly fed into the heat exchanger to realize heat exchange in the heat exchanger and heat the low-temperature water to a certain extent. However, when the heat exchanger recovers the waste heat of flue gas, it is limited by the heat transfer temperature difference and heat exchange efficiency. As the flue gas temperature decreases, the temperature difference between it and the low-temperature water gradually decreases, resulting in a decrease in heat exchange efficiency, making it difficult to effectively recover all the heat in the flue gas, and the recovery efficiency is low.

[0004] Therefore, how to provide a flue gas source heat pump system that improves the flue gas heat recovery efficiency is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] In view of this, the utility model provides a flue gas source heat pump system, aiming to solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A flue gas source heat pump system comprises a first heat exchanger, a compressor, a condenser and an expansion valve; the first heat exchanger is provided with a smoke inlet and a smoke outlet, and the first heat exchanger, the compressor, the condenser and the expansion valve form a circulation loop through a connecting pipeline.

[0008] Through the above technical scheme, the utility model provides a flue gas source heat pump system, in which the first heat exchanger is responsible for receiving medium and high temperature flue gas emitted from industrial furnaces, boilers, etc., and heating the refrigerant through heat exchange. The refrigerant becomes a high-temperature low-pressure gas, which enters the compressor through the connecting pipeline. The compressor works to convert the high-temperature low-pressure gas into a high-temperature high-pressure gas, which enters the condenser to exchange heat with cold water and becomes a medium-temperature high-pressure liquid, and then forms a low-temperature low-pressure gas through the expansion valve, and repeats this cycle. This process not only improves the energy utilization efficiency, but also reduces the original emission temperature of the flue gas, which is beneficial to environmental protection. After heat exchange, the flue gas temperature is significantly reduced, which provides convenient conditions for subsequent flue gas treatment or discharge.

[0009] Preferably, the above-mentioned flue gas source heat pump system further includes a second heat exchanger; the water inlet of the first heat exchanger is connected to a water source, and the water outlet is connected to the second heat exchanger, and the second heat exchanger forms a circulation loop with the compressor, the condenser and the expansion valve.

[0010] Preferably, in the above-mentioned flue gas source heat pump system, the second heat exchanger is a plate heat exchanger, and the plate heat exchanger has a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet; the cold water inlet is connected to the water source through the first connecting pipe, the cold water outlet is connected to the compressor through the second connecting pipe, the hot water inlet is connected to the water outlet through the third connecting pipe, the hot water outlet is connected to the condenser through the fourth connecting pipe, and the expansion valve is installed on the fourth connecting pipe. By setting up the second heat exchanger, the circulation loop formed by it, the compressor, the condenser and the expansion valve can be further utilized to increase the heat to a higher temperature level to meet different heat requirements, which helps to reduce heat loss and improve the overall energy efficiency of the system; at the same time, the system operating conditions are improved to operate more stably.

[0011] Preferably, in the above-mentioned flue gas source heat pump system, a control mechanism is further included, and the control mechanism is used to drive the operation of the first heat exchanger, the second heat exchanger, the compressor, the condenser and the expansion valve. The control mechanism can monitor the operating status and parameters (such as temperature, pressure, flow, etc.) of the system in real time to ensure the safe and stable operation of the system, and can automatically adjust the key parameters such as the compressor speed and the expansion valve opening according to the system requirements and actual operation conditions to optimize the system performance and improve the energy efficiency ratio. The utility model has a simple structure, can efficiently recover the waste heat in the flue gas, has a high utilization rate, and can effectively ensure the stable operation of the working conditions and improve the service life of each component.

[0012] Preferably, in the above-mentioned flue gas source heat pump system, the water inlet is connected to the water source through a fifth connecting pipeline, a circulating pump is installed on the fifth connecting pipeline, and the circulating pump is electrically connected to the control mechanism.

[0013] Preferably, in the above-mentioned flue gas source heat pump system, the compressor is connected to the condenser via a seventh connecting pipeline.

[0014] Preferably, in the above-mentioned flue gas source heat pump system, the inlet ends of the first connecting pipeline and the fifth connecting pipeline are connected to the water source through the drainage main pipe, and a constant pressure tank and a constant pressure water replenishment valve are installed on the drainage main pipe.

[0015] Preferably, in the above-mentioned flue gas source heat pump system, a sixth connecting pipeline is connected between the outlet of the constant pressure tank and the drainage main pipe, a valve is installed on the sixth connecting pipeline, and the valve and the constant pressure water replenishment valve are electrically connected to the control mechanism.

[0016] Preferably, in the above-mentioned flue gas source heat pump system, the condenser further has a water outlet side, the water outlet side is connected to a hot water tank, and the outer side wall of the hot water tank is wrapped with a heat-insulating material.

[0017] Preferably, in the above-mentioned flue gas source heat pump system, the compressor is connected to the condenser via a seventh connecting pipeline.

[0018] It can be seen from the above technical solutions that, compared with the prior art, the utility model discloses a flue gas source heat pump system, which has the following beneficial effects:

[0019] 1. The utility model has a simple structure, can efficiently recover waste heat in flue gas, has a high utilization rate, and can effectively ensure stable operation of the working conditions and improve the service life of each component.

[0020] 2. The utility model absorbs waste heat from flue gas through the first heat exchanger (flue gas heat exchanger), and through the setting of the heat pump unit, the waste heat is efficiently recovered and converted into useful thermal energy, thereby significantly improving the energy utilization efficiency; the heat pump unit can realize efficient transfer and utilization of heat through the heat pump cycle composed of the compressor, condenser, expansion valve and the second heat exchanger (plate heat exchanger); compared with traditional heating methods, the heat pump cycle has a higher energy efficiency ratio; and the system is automatically operated through the control mechanism, which reduces the need for manual intervention and improves the stability and reliability of the system.

[0021] 3. The utility model can be modified on the original equipment, which is convenient for construction and saves costs.

[0022] 4. The utility model can be applied to a variety of flue gas sources, including but not limited to power plant generator sets, industrial furnaces, heat treatment furnaces, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 The accompanying drawing is a schematic diagram of a flue gas source heat pump system provided by the utility model;

[0025] Figure 2 The attached drawing is a schematic diagram of a flue gas source heat pump system provided by the present invention with a second heat exchanger added.

[0026] in:

[0027] 1-first heat exchanger; 2-smoke inlet; 3-smoke exhaust outlet; 4-water inlet; 5-water source; 6-water outlet; 7-second heat exchanger; 8-compressor; 9-condenser; 10-expansion valve; 11-cold water inlet; 12-cold water outlet; 13-hot water inlet; 14-hot water outlet; 15-first connecting pipeline; 16-second connecting pipeline; 17-third connecting pipeline; 18-fourth connecting pipeline; 19-fifth connecting pipeline; 20-circulating pump; 21-drainage main pipe; 22-constant pressure tank; 23-constant pressure water replenishment valve; 24-sixth connecting pipeline; 25-valve; 26-water outlet side; 27-seventh connecting pipeline. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See attached Figure 1 The utility model discloses a flue gas source heat pump system, including a first heat exchanger 1, a compressor 8, a condenser 9 and an expansion valve 10; the first heat exchanger 1 is provided with a smoke inlet 2 and a smoke exhaust port 3, and the first heat exchanger 1, the compressor 8, the condenser 9 and the expansion valve 10 form a circulation loop through a connecting pipeline.

[0030] In order to further optimize the above technical solution, Figure 2 As shown, a second heat exchanger 7 is also included; the water inlet 4 of the first heat exchanger 1 is connected to the water source 5, and the water outlet 6 is connected to the second heat exchanger 7. The second heat exchanger 7 forms a circulation loop with the compressor 8, the condenser 9 and the expansion valve 10.

[0031] In order to further optimize the above technical solution, the first heat exchanger 1 is a flue gas heat exchanger. The structural arrangement and working principle of the flue gas heat exchanger and the plate heat exchanger are the same as those in the prior art and will not be described in detail herein.

[0032] In order to further optimize the above technical solution, the second heat exchanger 7 is a plate heat exchanger, which has a cold water inlet 11, a cold water outlet 12, a hot water inlet 13 and a hot water outlet 14; the cold water inlet 11 is connected to the water source 5 through a first connecting pipe 15, the cold water outlet 12 is connected to the compressor 8 through a second connecting pipe 16, the hot water inlet 13 is connected to the water outlet 6 through a third connecting pipe 17, the hot water outlet 14 is connected to the condenser 9 through a fourth connecting pipe 18, and the expansion valve 10 is installed on the fourth connecting pipe 18.

[0033] In order to further optimize the above technical solution, a control mechanism is also included, and the control mechanism is used to drive the operation of the first heat exchanger 1, the second heat exchanger 7, the compressor 8, the condenser 9 and the expansion valve 10.

[0034] In order to further optimize the above technical solution, the water inlet 4 is connected to the water source 5 through the fifth connecting pipeline 19, and a circulation pump 20 is installed on the fifth connecting pipeline 19, and the circulation pump is electrically connected to the control mechanism.

[0035] In order to further optimize the above technical solution, the compressor 8 is connected to the condenser 9 via a seventh connecting pipe 27 .

[0036] In order to further optimize the above technical solution, the inlet ends of the first connecting pipeline 15 and the fifth connecting pipeline 19 are connected to the water source 5 through the drainage main pipe 21, and the drainage main pipe 21 is installed with a constant pressure tank 22 and a constant pressure water replenishment valve 23.

[0037] In order to further optimize the above technical solution, a sixth connecting pipeline 24 is connected between the outlet of the constant pressure tank 22 and the drainage main pipe 21, and a valve 25 is installed on the sixth connecting pipeline 24. The valve 25 and the constant pressure water replenishment valve 23 are both electrically connected to the control mechanism.

[0038] In order to further optimize the above technical solution, the condenser 9 is further provided with a water outlet side 26, and the water outlet side 26 is connected to a hot water tank, and the outer wall of the hot water tank is wrapped with a heat preservation material.

[0039] The specific implementation of the utility model is:

[0040] like Figure 1 As shown, the working process of the flue gas source heat pump system is:

[0041] Medium and high temperature flue gas enters the first heat exchanger 1 (flue gas heat exchanger) from the smoke inlet, and the flue gas temperature is reduced and discharged from the smoke exhaust port 3. The refrigerant is heated by heat exchange, and the refrigerant becomes a high-temperature low-pressure gas. It enters the compressor 8 through the connecting pipeline. The compressor 8 converts the high-temperature low-pressure gas into a high-temperature high-pressure gas, enters the condenser 9 to exchange heat with cold water, and becomes a medium-temperature high-pressure liquid, and then passes through the expansion valve 10 to form a low-temperature low-pressure gas, and the cycle continues.

[0042] like Figure 2 As shown, in Figure 1 A second heat exchanger is added on the basis of the heat exchanger, and its working process is as follows:

[0043] Medium and high temperature flue gas enters the first heat exchanger 1 (flue gas heat exchanger) from the smoke inlet 2, and exchanges heat with the cooling water entering from the water inlet 4. The heat in the flue gas is transferred to the cooling water, and the flue gas temperature decreases and is discharged from the smoke exhaust port 3. The cooling water temperature increases and enters the hot water inlet 13 of the second heat exchanger 7 (plate heat exchanger) from the water outlet 6 through the third connecting pipe 17. The low temperature and low pressure liquid refrigerant in the second heat exchanger 7 (plate heat exchanger) absorbs the heat in the hot water. At this time, the hot water temperature decreases and the refrigerant becomes a high temperature and low pressure gas. It enters the compressor 8 through the second connecting pipe 16, is compressed into a high-temperature and high-pressure gas refrigerant, enters the condenser 9 through the seventh connecting pipe 27, exchanges heat with the cold water entering the condenser 9, releases heat and condenses into liquid refrigerant. At this time, the water temperature in the condenser 9 increases and can be used for heating or hot water supply through the water outlet side 26; the liquid refrigerant is throttled and reduced by the expansion valve 10, and becomes a low-temperature and low-pressure liquid refrigerant, and starts the next cycle again in the second heat exchanger 7 (plate heat exchanger), and the cycle is repeated.

[0044] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue gas source heat pump system, characterized in that: The invention comprises a first heat exchanger (1), a compressor (8), a condenser (9) and an expansion valve (10); the first heat exchanger (1) is provided with a smoke inlet (2) and a smoke outlet (3); the first heat exchanger (1), the compressor (8), the condenser (9) and the expansion valve (10) form a circulation loop through connecting pipelines.

2. A flue gas source heat pump system according to claim 1, characterized in that: It also includes a second heat exchanger (7); the water inlet (4) of the first heat exchanger (1) is connected to a water source (5), the water outlet (6) of the first heat exchanger (1) is connected to the second heat exchanger (7), and the second heat exchanger (7) forms a circulation loop with the compressor (8), the condenser (9) and the expansion valve (10).

3. A flue gas source heat pump system according to claim 2, characterized in that: The second heat exchanger (7) is a plate heat exchanger, and the plate heat exchanger has a cold water inlet (11), a cold water outlet (12), a hot water inlet (13) and a hot water outlet (14); the cold water inlet (11) is connected to the water source (5) through a first connecting pipeline (15), the cold water outlet (12) is connected to the compressor (8) through a second connecting pipeline (16), the hot water inlet (13) is connected to the water outlet (6) through a third connecting pipeline (17), and the hot water outlet (14) is connected to the condenser (9) through a fourth connecting pipeline (18), and the expansion valve (10) is installed on the fourth connecting pipeline (18).

4. A flue gas source heat pump system according to claim 3, characterized in that: It also includes a control mechanism, which is used to drive the operation of the first heat exchanger (1), the second heat exchanger (7), the compressor (8), the condenser (9) and the expansion valve (10).

5. A flue gas source heat pump system according to claim 4, characterized in that: The water inlet (4) is connected to the water source (5) via a fifth connecting pipeline (19), a circulating pump (20) is installed on the fifth connecting pipeline (19), and the circulating pump is electrically connected to the control mechanism.

6. A flue gas source heat pump system according to claim 4, characterized in that: The compressor (8) is connected to the condenser (9) via a seventh connecting pipe (27).

7. A flue gas source heat pump system according to claim 5, characterized in that: The inlet ends of the first connecting pipeline (15) and the fifth connecting pipeline (19) are connected to the water source (5) via a drainage main pipe (21), and a constant pressure tank (22) and a constant pressure water replenishment valve (23) are installed on the drainage main pipe (21).

8. A flue gas source heat pump system according to claim 7, characterized in that: A sixth connecting pipeline (24) is connected between the outlet of the constant pressure tank (22) and the main drainage pipe (21), a valve (25) is installed on the sixth connecting pipeline (24), and the valve (25) and the constant pressure water replenishment valve (23) are both electrically connected to the control mechanism.

9. A flue gas source heat pump system according to claim 4, characterized in that: The condenser (9) also has a water outlet side (26), and the water outlet side (26) is connected to a hot water tank, and the outer wall of the hot water tank is wrapped with a heat-insulating material.

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