Industrial waste gas waste heat recovery cold and hot water unit

Abstract

The utility model discloses an industrial waste gas waste heat recovery cold and hot water unit which comprises a first heat exchanger connected with a waste gas pipeline and a second heat exchanger connected with a user side, a heat supply system is arranged between the first heat exchanger and the second heat exchanger, and the first heat exchanger comprises a shell. A smoke heat exchange pipe and a refrigerant heat exchange pipe are arranged in the shell, the connector end of the smoke heat exchange pipe and the connector end of the refrigerant heat exchange pipe extend to the outer side of the shell, a water tank is arranged on one side of the first heat exchanger, two water receiving openings of the first heat exchanger are connected with a water supplementing pipe and the water tank respectively, and a third heat exchanger is arranged on the other side of the water tank. A cold supply system is arranged between the second heat exchanger and the third heat exchanger, two water receiving ports of the third heat exchanger are connected with a water supplementing pipe and a water tank respectively, and a water drainage pipe with a valve is installed on the water tank. According to the utility model, waste gas and waste heat generated during refrigeration are recovered for heating, so that the comprehensive utilization rate of energy is improved.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to an industrial waste gas waste heat recovery chiller / hot water unit. Background Technology

[0002] Waste heat recovery from waste gas is an important energy utilization technology that aims to recover and reuse the heat energy in waste gas emitted during industrial production processes, thereby saving energy, reducing production costs, and minimizing environmental pollution. In winter, waste heat recovery is used for heating. In summer, factories typically need to equip themselves with air conditioning units for cooling. During normal cooling operation, the condensation heat of these units is generally discharged through the cooling system, resulting in a significant waste of heat energy.

[0003] Furthermore, existing heating and cooling systems typically operate independently, resulting in low energy efficiency, and require improvement. Utility Model Content

[0004] The technical problem this invention aims to solve is that heating and cooling systems typically operate independently, resulting in low energy efficiency, and therefore require improvement.

[0005] To solve the above problems, the technical solution of this utility model is as follows: an industrial waste gas waste heat recovery chiller / hot water unit, including a first heat exchanger connected to a waste gas pipeline and a second heat exchanger connected to a user end, a heating system provided between the first and second heat exchangers, the first heat exchanger including a shell, inside which are provided flue gas heat exchange pipes and refrigerant heat exchange pipes, the interface ends of the flue gas heat exchange pipes and refrigerant heat exchange pipes extending to the outside of the shell, a water tank provided on one side of the first heat exchanger, and two water inlets of the first heat exchanger respectively connected to a water supply pipe and the water tank, a third heat exchanger provided on the other side of the water tank, a cooling system provided between the second and third heat exchangers, two water inlets of the third heat exchanger respectively connected to a water supply pipe and the water tank, and a drain pipe with a valve installed on the water tank.

[0006] Furthermore, the unit also includes a compressor, a refrigerant tank, an expansion valve, a four-way valve, and a gas-liquid separator. The output end of the refrigerant tank is connected to the expansion valve via a connecting pipe. The output end of the expansion valve is connected to the refrigerant interface of the first heat exchanger via pipe A. The four interfaces of the four-way valve are respectively connected to another refrigerant interface of the first heat exchanger, the gas-liquid separator, the compressor, and the refrigerant interface of the second heat exchanger via pipes B, C, D, and E. The output end of the gas-liquid separator is connected to the input end of the compressor via a conduit. The other refrigerant interface of the second heat exchanger is connected to the input end of the refrigerant tank via pipe F.

[0007] Furthermore, the output end of the expansion valve is connected to pipe F via pipe G, one refrigerant interface of the third heat exchanger is connected to pipe B via pipe H, and the other refrigerant interface is connected to the input end of the refrigerant tank via pipe I; solenoid valves are installed on pipes A, G, and H, and check valves are installed on pipes B, I, and F.

[0008] Furthermore, when the heating system is working, the solenoid valve on pipe A is opened, pipes B and C form a passage through a four-way valve, and pipes D and E form a passage through a four-way valve; the second heat exchanger is used as a condenser.

[0009] When the cooling system is working, the solenoid valves on pipes G and H are opened, pipes B and D form a passage through a four-way valve, and pipes C and E form a passage through a four-way valve; the second heat exchanger is used as an evaporator.

[0010] The advantages of this invention compared to existing technologies are: by recovering waste gas and waste heat generated during refrigeration for heating, the comprehensive utilization rate of energy is improved, the demand for additional energy can be reduced, thereby reducing operating costs and energy consumption. Attached Figure Description

[0011] Figure 1 This is a diagram showing the operational structure of the heating system of this utility model.

[0012] Figure 2 This is a diagram showing the operating structure of the cooling system of this utility model.

[0013] Figure 3 This is a structural diagram of the first heat exchanger of this utility model.

[0014] As shown in the figure: 1. First heat exchanger; 1.1. Shell; 1.2. Flue gas heat exchange tube; 1.3. Refrigerant heat exchange tube; 2. Second heat exchanger; 3. Water tank; 4. Make-up water pipe; 5. Third heat exchanger; 6. Compressor; 7. Refrigerant tank; 8. Expansion valve; 9. Four-way valve; 10. Gas-liquid separator; 11. Pipe A; 12. Pipe B; 13. Pipe C; 14. Pipe D; 15. Pipe E; 16. Pipe F; 17. Pipe G; 18. Pipe H; 19. Pipe I. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] like Figures 1 to 3 As shown, an industrial waste gas waste heat recovery chiller / hot water unit includes a first heat exchanger 1 connected to a waste gas pipeline and a second heat exchanger 2 connected to a user end. A heating system is provided between the first heat exchanger 1 and the second heat exchanger 2. The first heat exchanger 1 includes a shell 1.1. A flue gas heat exchange pipe 1.2 and a refrigerant heat exchange pipe 1.3 are provided inside the shell 1.1. The interface ends of the flue gas heat exchange pipe 1.2 and the refrigerant heat exchange pipe 1.3 extend to the outside of the shell 1.1. A water tank 3 is provided on one side of the first heat exchanger 1, and two water inlets of the first heat exchanger 1 are respectively connected to a water supply pipe 4 and the water tank 3. A third heat exchanger 5 is provided on the other side of the water tank 3. A cooling system is provided between the second heat exchanger 2 and the third heat exchanger 5. Two water inlets of the third heat exchanger 5 are respectively connected to a water supply pipe 4 and the water tank 3. A drain pipe with a valve is installed on the water tank 3.

[0017] Cold water is supplied to the first heat exchanger 1 through the water supply pipe 4. After the cold water exchanges heat with the exhaust gas, it forms hot water and is then transported to the water tank 3 for storage.

[0018] An industrial waste heat recovery chiller / hot water unit further includes a compressor 6, a refrigerant tank 7, an expansion valve 8, a four-way valve 9, and a gas-liquid separator 10. The output end of the refrigerant tank 7 is connected to the expansion valve 8 via a connecting pipe. The output end of the expansion valve 8 is connected to the refrigerant interface of a first heat exchanger 1 via pipe A11. The four interfaces of the four-way valve 9 are respectively connected to another refrigerant interface of the first heat exchanger 1, the gas-liquid separator 10, the compressor 6, and the refrigerant interface of the second heat exchanger 2 via pipes B12, C13, D14, and E15. The output end of the gas-liquid separator 10 is connected to the input end of the compressor 6 via a conduit. The other refrigerant interface of the second heat exchanger 2 is connected to the input end of the refrigerant tank 7 via pipe F16.

[0019] The output end of the expansion valve 8 is connected to the pipe F16 via pipe G17. One refrigerant interface of the third heat exchanger 5 is connected to the pipe B12 via pipe H18, and the other refrigerant interface is connected to the input end of the refrigerant tank 7 via pipe I19. Solenoid valves are installed on pipes A11, G17, and H18, and check valves are installed on pipes B12, I19, and F16.

[0020] In practical use, when the heating system is working, the solenoid valve on pipe A11 is opened, pipes B12 and C13 form a passage through the four-way valve 9, and pipes D14 and E15 form a passage through the four-way valve 9; the second heat exchanger 2 is used as a condenser.

[0021] The two inlets of the second heat exchanger 2 are connected to the inlet pipe and the outlet pipe. Cold water is introduced into the second heat exchanger 2 through the inlet pipe. The refrigerant is output from the refrigerant tank 7 and throttled and depressurized through the expansion valve 8. When it flows through the first heat exchanger 1, the refrigerant absorbs heat and evaporates to form steam. The steam is compressed and pressurized by the compressor 6 after passing through the gas-liquid separator 10. The high-pressure steam enters the second heat exchanger 2, releases heat and condenses into liquid, and then flows back into the refrigerant tank 7. The cold water in the second heat exchanger 2 is heated into hot water and output to achieve heating.

[0022] The rate at which cold water is delivered to the first heat exchanger 1 is controlled to keep the water temperature in the first heat exchanger 1 constant, thus ensuring the heating effect and providing hot water.

[0023] When the cooling system is working, the solenoid valves on pipes G17 and H18 are opened, pipes B12 and D14 form a passage through the four-way valve 9, and pipes C13 and E15 form a passage through the four-way valve 9; the second heat exchanger 2 is used as an evaporator.

[0024] Cold water is supplied to the third heat exchanger 5 through the water supply pipe 4. The two water inlets of the second heat exchanger 2 are connected to the inlet pipe and the outlet pipe. Warm water at room temperature is supplied to the second heat exchanger 2 through the inlet pipe. The refrigerant is output from the refrigerant tank 7 and throttled and depressurized through the expansion valve 8. When it flows through the second heat exchanger 2, the refrigerant absorbs the heat of the warm water and evaporates to form steam. The warm water absorbs heat and is output as cold water, thus achieving refrigeration. The steam is compressed and pressurized by the compressor 6 after passing through the gas-liquid separator 10. The high-pressure steam enters the third heat exchanger 5, releases heat and condenses into liquid, and then flows back into the refrigerant tank 7. The cold water in the third heat exchanger 5 is heated into hot water and transported to the water tank 3.

[0025] Cold water is supplied to the first heat exchanger 1 through the water supply pipe 4. After the cold water exchanges heat with the exhaust gas, it forms hot water, which is then transported to the water tank 3 for storage and to provide hot water.

[0026] By recovering waste gas and residual heat generated during refrigeration for heating, the overall utilization rate of energy can be improved, reducing the need for additional energy and thus lowering operating costs and energy consumption.

[0027] The parts not disclosed in this utility model are all prior art, and their specific structures and working principles will not be described in detail.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0030] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An industrial waste gas waste heat recovery chiller / hot water unit, comprising a first heat exchanger (1) connected to a waste gas pipeline and a second heat exchanger (2) connected to a user end, wherein a heating system is provided between the first heat exchanger (1) and the second heat exchanger (2), characterized in that: The first heat exchanger (1) includes a shell (1.1), inside which are provided a flue gas heat exchange tube (1.2) and a refrigerant heat exchange tube (1.3). The interface ends of the flue gas heat exchange tube (1.2) and the refrigerant heat exchange tube (1.3) extend to the outside of the shell (1.1). A water tank (3) is provided on one side of the first heat exchanger (1), and the two water inlets of the first heat exchanger (1) are respectively connected to a water supply pipe (4) and a water tank (3). A third heat exchanger (5) is provided on the other side of the water tank (3). A cooling system is provided between the second heat exchanger (2) and the third heat exchanger (5). The two water inlets of the third heat exchanger (5) are respectively connected to a water supply pipe (4) and a water tank (3).

2. The industrial waste gas waste heat recovery chiller / hot water unit according to claim 1, characterized in that: The unit also includes a compressor (6), a refrigerant tank (7), an expansion valve (8), a four-way valve (9), and a gas-liquid separator (10). The output end of the refrigerant tank (7) is connected to the expansion valve (8) through a connecting pipe. The output end of the expansion valve (8) is connected to the refrigerant interface of the first heat exchanger (1) through pipe A (11). The four interfaces of the four-way valve (9) are respectively connected to the other refrigerant interface of the first heat exchanger (1), the gas-liquid separator (10), the compressor (6), and the refrigerant interface of the second heat exchanger (2) through pipes B (12), C (13), D (14), and E (15). The output end of the gas-liquid separator (10) is connected to the input end of the compressor (6) through a conduit. The other refrigerant interface of the second heat exchanger (2) is connected to the input end of the refrigerant tank (7) through pipe F (16).

3. The industrial waste gas waste heat recovery chiller / hot water unit according to claim 2, characterized in that: The output end of the expansion valve (8) is connected to the pipe F (16) through the pipe G (17), one refrigerant interface of the third heat exchanger (5) is connected to the pipe B (12) through the pipe H (18), and the other refrigerant interface is connected to the input end of the refrigerant tank (7) through the pipe I (19). Solenoid valves are installed on pipes A (11), G (17) and H (18), and check valves are installed on pipes B (12), I (19) and F (16).

4. The industrial waste gas waste heat recovery chiller / hot water unit according to claim 3, characterized in that: When the heating system is working, the solenoid valve on pipe A (11) is opened, pipes B (12) and C (13) form a passage through the four-way valve (9), and pipes D (14) and E (15) form a passage through the four-way valve (9).

5. The industrial waste gas waste heat recovery chiller / hot water unit according to claim 4, characterized in that: The second heat exchanger (2) is used as a condenser.

6. The industrial waste gas waste heat recovery chiller / hot water unit according to claim 3, characterized in that: When the cooling system is working, the solenoid valves on pipes G (17) and H (18) are opened, pipes B (12) and D (14) form a passage through the four-way valve (9), and pipes C (13) and E (15) form a passage through the four-way valve (9).

7. The industrial waste gas waste heat recovery chiller / hot water unit according to claim 6, characterized in that: The second heat exchanger (2) is used as an evaporator.

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