Super heat pump type generalized heat exchanger and heat exchange method

Abstract

According to the super heat pump type generalized heat exchanger and the heat exchange method, absorption type circulation and compression type circulation are combined in a unit, a multi-stage heat exchange system is constructed, efficient utilization of energy is achieved by deeply excavating waste heat resources, and the requirement for high-temperature heating can still be met in the face of large-amplitude temperature changes. Compared with the existing similar technology in the market, the heat pump has the advantages of obviously improved heating efficiency and outstanding energy-saving advantage.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery and heating, and in particular to a heat pump unit for extracting heat from industrial waste heat to produce high-temperature hot water. Background Art

[0002] Industrial energy consumption in my country accounts for more than 70% of the total energy consumption, of which at least 50% is converted into industrial waste heat with different carriers and temperatures. Recyclable waste heat resources account for 10% to 40% of the total energy consumption in the industrial sector.

[0003] Electric heat pumps are restricted by the properties of Freon, the operating pressure range of the compressor, and the failure of lubricating oil. The heating temperature is often lower than 100°C and cannot achieve a large temperature rise. The heating efficiency of absorption heat pumps is too low.

[0004] In this context, the invention proposes a super heat pump type generalized heat exchanger and heat exchange method, which uses absorption cycle and compression cycle at the same time to produce high-temperature hot water using waste heat. The use of multi-stage heat exchange increases the temperature operating range and improves heating efficiency compared to existing heat pump technology. Summary of the invention

[0005] The present application discloses a super heat pump type generalized heat exchanger and a heat exchange method, wherein the heat pump comprises a generator (1), an absorber A (2), an absorber B (3), a condenser A (4), a condenser B (5), an evaporator A (6), an evaporator B (7), a condenser C (8), a heat exchanger (9), a solution heat exchanger A (10), a solution heat exchanger B (11), a compressor (12), a solution pump A (13), a solution pump B (14), a throttle valve A (15), a throttle valve B (16), a throttle valve C (17), a waste heat source inlet (18), a waste heat source outlet (19), a hot water inlet (20), and a hot water outlet (21).

[0006] The super heat pump type generalized heat exchanger and heat exchange method are characterized in that the generator (1) is connected to the condenser B (5), the solution heat exchanger B (11), the solution pump B (14), and the waste heat source inlet (18); the absorber A (2) is connected to the evaporator B (7) and the solution heat exchanger A (10); the absorber B (3) is connected to the evaporator B (7), the evaporator C (8), the solution heat exchanger A (10), the solution heat exchanger B (11), and the solution pump A (13); the condenser A (4) is connected to the compressor (12), the throttle valve A (15), and the hot water outlet (21); the condenser B (5) is connected to the generator (1 ), throttle valve C (17), and a hot water inlet (20); the evaporator A (6) is connected to the compressor (12), the throttle valve A (15), and the waste heat source outlet (19); the evaporator B (7) is connected to the absorber A (2), the absorber B (3), the solution pump A (13), and the throttle valve B (16); the evaporator C (8) is connected to the absorber B (3), the throttle valve B (16), and the throttle valve C (17); the heat exchanger (9) is connected to the absorber A (2), the condenser B (5), the evaporator A (6), and the condenser C (8); and the compressor (12) is connected to the condenser A (4) and the evaporator A (6).

[0007] The super heat pump type generalized heat exchanger and heat exchange method are described. The waste heat source passes through the waste heat source inlet (18) and releases heat through the generator (1), evaporator C (8), heat exchanger (9), and evaporator A (6) and then leaves from the waste heat source outlet (19). Hot water passes through the hot water inlet (20) and passes through the condenser A (5), heat exchanger (9), absorber A (2), and condenser A (4) in sequence to be heated and then leaves from the hot water outlet (21). The working fluid C absorbs the heat released from the absorber B (3) and then circulates inside the solution pump A (13) and is absorbed by the evaporator B (7).

[0008] The super heat pump type generalized heat exchanger and heat exchange method include two circulation processes in the unit, namely, an absorption cycle and a compression cycle. The absorption cycle is composed of a mixed solution of working fluid A and working fluid B, wherein working fluid A is an absorbent and working fluid B is a refrigerant. Working fluid C circulates between absorber B (3) and evaporator B (7). The compression cycle uses working fluid D. The mixed solution of working fluid A and working fluid B is heated by a waste heat source in a generator (1) to release gaseous working fluid B. Working fluid B releases heat through a condenser B (5) to become liquid working fluid B. Then, it passes through a throttle valve C (17) and enters the evaporator C (8) to absorb heat and become gaseous working fluid B. Then, it enters the absorber B (3). Another part of the liquid working medium B passes through the throttle valve B (16) into the evaporator B (7) to release heat and then becomes gaseous working medium B and enters the absorber A (2); a part of the mixed solution of concentrated working medium A and working medium B in the generator (1) passes through the solution pump B (14) and the solution heat exchanger B (11) into the absorber B (3) to absorb the heat released by the gaseous working medium B from the evaporator C (8); the other part passes through the solution heat exchanger A (10) into the absorber A (2) to absorb the heat released by the gaseous working medium B from the evaporator B (7) and then passes through the solution heat exchanger A (10) to mix with the mixed solution exiting the absorber B (3) and then passes through the solution heat exchanger B (11) to return to the generator (1). The working medium C circulates between the absorber B (3) and the evaporator B (7); the working medium C absorbs the heat released from the absorber B (3) and then passes through the solution pump A (13) to release the heat required by the evaporator B (7). The working medium D is heated by the waste heat source in the evaporator A (6) and becomes a gaseous working medium D. The working medium D is compressed by the compressor (12) and enters the condenser A (4) to release heat to heat the hot water. The working medium D then enters the evaporator A (6) through the throttle valve A (15).

[0009] The super heat pump type generalized heat exchanger and heat exchange method are described, wherein the heat generated in the heat exchange process of the condenser B (5), the absorber A (2), and the condenser A (4) and the heat released by the waste heat source in the heat exchanger (9) are all used to heat hot water; the heat required for evaporation of the working fluid in the evaporator A (6), the evaporator C (8) and the generator (1) comes from the waste heat source; and the evaporator B (7) absorbs the heat released by the absorber B (3).

[0010] The super heat pump type generalized heat exchanger and heat exchange method, the unit adopts an absorption and compression combined system.

[0011] In the super heat pump type generalized heat exchanger and heat exchange method, working fluid A is lithium bromide, water, and alcohols, working fluid B is water, freon, and ammonia, working fluid C is water or freon, and working fluid D is a mixed working fluid or a natural working fluid.

[0012] In the super heat pump type generalized heat exchanger and heat exchange method, the compressor (12) of the compression cycle is a piston type, a scroll type, a centrifugal type, a screw type or a jet type. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a system diagram of a super heat pump type generalized heat exchanger and heat exchange method.

[0014] 1-generator, 2-absorber A, 3-absorber B, 4-condenser A, 5-condenser B, 6-evaporator A, 7-evaporator B, 8-evaporator C, 9-heat exchanger, 10-solution heat exchanger A, 11-solution heat exchanger B, 12-compressor, 13-solution pump A, 14-solution pump B, 15-throttle valve A, 16-throttle valve B, 17-throttle valve C, 18-waste heat source inlet, 19-waste heat source outlet, 20-hot water inlet, 21-hot water outlet. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] In this embodiment, working fluid A is lithium bromide, working fluid B is water, working fluid C is water, working fluid D is R245fa, the waste heat source is industrial waste heat, and the temperature of hot water produced is 120°C.

[0017] The system flow of this embodiment is shown in the attached figure. Figure 1 As shown, this embodiment includes: a generator (1), an absorber A (2), an absorber B (3), a condenser A (4), a condenser B (5), an evaporator A (6), an evaporator B (7), a condenser C (8), a heat exchanger (9), a solution heat exchanger A (10), a solution heat exchanger B (11), a compressor (12), a solution pump A (13), a solution pump B (14), a throttle valve A (15), a throttle valve B (16), a throttle valve C (17), a waste heat source inlet (18), a waste heat source outlet (19), a hot water inlet (20), and a hot water outlet (21).

[0018] In this embodiment, the generator (1) is connected to the condenser B (5), the solution heat exchanger B (11), the solution pump B (14), and the waste heat source inlet (18); the absorber A (2) is connected to the evaporator B (7) and the solution heat exchanger A (10); the absorber B (3) is connected to the evaporator B (7), the evaporator C (8), the solution heat exchanger A (10), the solution heat exchanger B (11), and the solution pump A (13); the condenser A (4) is connected to the compressor (12), the throttle valve A (15), and the hot water outlet (21); the condenser B (5) is connected to the generator (1), the throttle valve C ( 17) and a hot water inlet (20); the evaporator A (6) is connected to the compressor (12), the throttle valve A (15) and the waste heat source outlet (19); the evaporator B (7) is connected to the absorber A (2), the absorber B (3), the solution pump A (13) and the throttle valve B (16); the evaporator C (8) is connected to the absorber B (3), the throttle valve B (16) and the throttle valve C (17); the heat exchanger (9) is connected to the absorber A (2), the condenser B (5), the evaporator A (6) and the condenser C (8); the compressor (12) is connected to the condenser A (4) and the evaporator A (6).

[0019] In this embodiment, the unit includes two circulation processes, an absorption cycle and a compression cycle. The absorption cycle uses a solution of lithium bromide and water, wherein lithium bromide is an absorbent and water is a refrigerant. Water is circulated between absorber B and evaporator B. The compression cycle uses R245fa. The lithium bromide solution is heated by the waste heat source in the generator (1) to release water vapor. The water vapor releases heat and becomes liquid water through the condenser B (5). The water vapor then passes through the throttle valve C (17) and enters the evaporator C (8). A part of the water vapor absorbs heat and becomes water vapor, which enters the absorber B (3). The other part of the liquid water passes through the throttle valve B(16) enters the evaporator B(7) to release heat and then turns into water vapor and enters the absorber A(2); the lithium bromide concentrated solution in the generator (1) passes through the solution pump B(14) and the solution heat exchanger B(11), and a part of it enters the absorber B(3) to absorb the water vapor from the evaporator C(8) and release heat, and the other part passes through the solution heat exchanger A(10) and enters the absorber A(2) to absorb the water vapor from the evaporator B(7) and release heat, and then passes through the solution heat exchanger A(10) and mixes with the mixed solution from the absorber B(3) and then passes through the solution heat exchanger B(11) and returns to the generator (1). Water circulates between the absorber B(3) and the evaporator B(7); the water absorbs the heat released from the absorber B(3) and then passes through the solution pump A(13) to release the heat required by the evaporator B(7). R245fa is heated by the waste heat source in the evaporator A (6) and becomes gaseous. R245fa is compressed by the compressor (12) and enters the condenser A (4) to release heat to heat the hot water. It then enters the evaporator A (6) through the throttle valve A (15).

[0020] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A super heat pump type generalized heat exchanger and heat exchange method, characterized in that: The heat pump comprises a generator (1), an absorber A (2), an absorber B (3), a condenser A (4), a condenser B (5), an evaporator A (6), an evaporator B (7), a condenser C (8), a heat exchanger (9), a solution heat exchanger A (10), a solution heat exchanger B (11), a compressor (12), a solution pump A (13), a solution pump B (14), a throttle valve A (15), a throttle valve B (16), a throttle valve C (17), a waste heat source inlet (18), a waste heat source outlet (19), a hot water inlet (20), and a hot water outlet (21); the generator (1) is connected to the condenser B (5), the solution heat exchanger B (11), and the hot water inlet (20). The absorber A (2) is connected to the evaporator B (7) and the solution heat exchanger A (10); the absorber B (3) is connected to the evaporator B (7), the evaporator C (8), the solution heat exchanger A (10), the solution heat exchanger B (11), and the solution pump A (13); the condenser A (4) is connected to the compressor (12), the throttle valve A (15), and the hot water outlet (21); the condenser B (5) is connected to the generator (1), the throttle valve C (17), and the hot water inlet (20); the evaporator A (6) is connected to the compressor (12), the throttle valve A (15), and the waste heat source The exhaust gas generator (10) is connected to the exhaust gas generator (11), the exhaust gas generator (12) is connected to the exhaust gas generator (13), the exhaust gas generator (14) is connected to the exhaust gas generator (15), the exhaust gas generator (16) is connected to the exhaust gas generator (17), the exhaust gas generator (18) is connected to the exhaust gas generator (19), the exhaust gas generator (10) is connected to the exhaust gas generator (11), the exhaust gas generator (12) is connected to the exhaust gas generator (12), the exhaust gas generator (13) is connected to the exhaust gas generator (15), the exhaust gas generator (14) is connected to the exhaust gas generator (16), the exhaust gas generator (17) is connected to the exhaust gas generator (18) 19), the hot water passes through the hot water inlet (20) in sequence through the condenser A (5), the heat exchanger (9), the absorber A (2), and the condenser A (4) to be heated and then leaves from the hot water outlet (21), the working fluid C absorbs the heat released from the absorber B (3) and then circulates inside the solution pump A (13) to be absorbed by the evaporator B (7); the unit includes two circulation processes, namely, the absorption cycle and the compression cycle: the absorption cycle is composed of a mixed solution of working fluid A and working fluid B, wherein working fluid A is the absorbent and working fluid B is the refrigerant, and the working fluid C circulates between the absorber B (3) and the evaporator B (7), and the compression cycle uses working fluid D;A mixed solution of working fluid A and working fluid B is heated by a waste heat source in a generator (1) to release gaseous working fluid B. The working fluid B passes through a condenser B (5) to release heat and becomes liquid working fluid B. The working fluid B then passes through a throttle valve C (17) and enters an evaporator C (8). A portion of the working fluid B absorbs heat and becomes gaseous working fluid B and enters an absorber B (3). The other portion of the liquid working fluid B passes through a throttle valve B (16) and enters an evaporator B (7). The portion of the liquid working fluid B releases heat and becomes gaseous working fluid B and enters an absorber A (2). Generator (1) A part of the concentrated working fluid A and working fluid B mixed solution passes through the solution pump B (14) and the solution heat exchanger B (11) and enters the absorber B (3) to absorb the heat released by the gaseous working fluid B from the evaporator C (8). The other part passes through the solution heat exchanger A (10) and enters the absorber A (2) to absorb the heat released by the gaseous working fluid B from the evaporator B (7). After passing through the solution heat exchanger A (10), it is mixed with the mixed solution exiting the absorber B (3) and then passes through the solution heat exchanger B (11) to return to the generator (1). The working fluid C circulates between the absorber B (3) and the evaporator B (7); the working fluid C absorbs the heat released by the absorber B (3) and then passes through the solution pump A (13) to release the heat required by the evaporator B (7). The working medium D is heated by the waste heat source in the evaporator A (6) and becomes gaseous working medium D. After being compressed by the compressor (12), it enters the condenser A (4) to release heat to heat the hot water and then enters the evaporator A (6) through the throttle valve A (15). ; 2. A super heat pump type generalized heat exchanger and heat exchange method according to claim 1, characterized in that: The heat generated by the heat exchange process of the condenser B (5), the absorber A (2) and the condenser A (4) and the heat released by the waste heat source in the heat exchanger (9) are all used to heat hot water; the heat required for evaporation of the working fluid in the evaporator A (6), the evaporator C (8) and the generator (1) comes from the waste heat source; the evaporator B (7) absorbs the heat released by the absorber B (3).

3. A super heat pump type generalized heat exchanger and heat exchange method according to claim 1, characterized in that: The unit adopts a combined absorption and compression system.

4. A super heat pump type generalized heat exchanger and heat exchange method according to claim 1, characterized in that: Working fluid A is lithium bromide, water, and alcohols; working fluid B is water, freon, and ammonia; working fluid C is water or freon; and working fluid D is a mixed working fluid or a natural working fluid.

5. A super heat pump type generalized heat exchanger and heat exchange method according to claim 1, characterized in that: The compressor (12) of the compression cycle is of piston type, scroll type, centrifugal type, screw type or jet type.

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