Combined cooling and heating system based on absorption technology

Abstract

The invention discloses a combined cooling and heating system based on an absorption technology, which relates to the technical field of combined cooling and heating and comprises a high-temperature waste gas system, an absorption heat supply system and an absorption refrigeration system. The heat exchange intensity is improved by installing the absorption type large-temperature-difference heat generating unit, the recovery temperature of a heat supply pile is reduced, the energy transmission capacity of a pipe network is improved, and the overall heat supply performance can be improved. By installing the absorption type refrigerating system, when heat supply needs do not exist in summer or the heat supply load is low, generated hot water is used for driving the absorption type refrigerator to conduct refrigeration, centralized cooling is achieved, the use efficiency can be improved, and the economic benefits can be improved. Due to the fact that the overall heat supply and cold supply have large load fluctuation in different time periods, the heat storage body and the cold storage body are added, the system load can be well adjusted, the load adjusting pressure is relieved, meanwhile, the system is prevented from being overheated and overcooled, and the starting speed and the adjusting reaction capacity of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of combined cooling and heating, and in particular to a combined cooling and heating system based on absorption technology. Background Art

[0002] In recent years, with my country's rapid economic growth and increasing urbanization, the use of centralized heating and cooling systems has expanded rapidly. Numerous factories have been built around cities, generating high-temperature exhaust gases that are released into the atmosphere. Furthermore, heating in northern Chinese cities is primarily fueled by coal, contributing to severe smog pollution.

[0003] In recent years, my country has vigorously developed clean energy, leveraging waste heat generated in industry. While utilizing high-temperature waste heat in heating and cooling systems addresses environmental concerns, it also recovers the heat and cooling energy generated. However, most high-temperature waste gas recovery systems only provide heat, using simple heat exchangers. In the cooling system, absorption heat pumps are used to heat the circulating water, which is then used for cooling. This approach reduces overall system performance and lacks a heat storage system for system regulation. Summary of the Invention

[0004] The purpose of the present invention is to provide a combined cooling and heating system based on absorption technology to solve the problems existing in the above-mentioned prior art, improve the overall performance of the system, and set up a heat storage system to facilitate system adjustment.

[0005] To achieve the above objectives, the present invention provides the following solutions: The present invention provides a combined cooling and heating system based on absorption technology, comprising a high-temperature exhaust gas system, an absorption heating system, and an absorption refrigeration system;

[0006] The high-temperature exhaust gas system includes a high-temperature exhaust gas source, a first heat exchanger and a first circulation fan. The outlet of the high-temperature exhaust gas source is connected to the heat medium side inlet of the first heat exchanger through the first circulation fan, and the heat medium side outlet of the first heat exchanger is connected to the return port of the high-temperature exhaust gas source; the refrigerant side of the first heat exchanger is connected in parallel with the absorption heating system and the absorption refrigeration system; the absorption heating system includes an absorption large temperature difference heat exchange unit, and the absorption refrigeration system includes an absorption chiller.

[0007] In one embodiment, the absorption heating system includes a fifth valve, a sixth valve, an absorption large temperature difference heat exchange unit, and a first circulating water pump, which are connected in series with the refrigerant side outlet of the first heat exchanger in sequence, and the first circulating water pump is connected to the refrigerant side inlet of the first heat exchanger; a fourth valve is connected in parallel between the refrigerant side outlet of the first heat exchanger and the fifth valve, and the fourth valve is connected to a heat storage body. After the end of the heat storage body is connected to the fifth valve, a ninth valve, an absorption refrigeration system and the sixth valve are connected in parallel, and the ninth valve is connected to the first circulating water pump.

[0008] In one embodiment, the absorption-type large temperature difference heat exchange unit includes a second heat exchanger and a first generator, the outlet of the first generator connected to the outlet of the sixth valve is connected to the first circulating water pump; the refrigerant side outlet of the second heat exchanger is connected to the first evaporator, and the outlet of the first evaporator is connected to the refrigerant side inlet of the second heat exchanger; the external heating return water pipes are respectively connected to the first absorber, the outlet of the first absorber is connected to the first condenser, and the outlet of the first condenser is connected to the external heating water supply pipe.

[0009] In one embodiment, the heat medium side inlet of the second heat exchanger is connected to the heat medium side outlet of the first heat exchanger, and the heat medium side outlet of the second heat exchanger is connected to the return port of the high-temperature exhaust gas source; a second circulating water pump is provided between the refrigerant side outlet of the second heat exchanger and the first evaporator.

[0010] In one embodiment, the absorption refrigeration system includes a fifteenth valve, and the end of the heat storage body is connected to the fifth valve and then connected in parallel with a ninth valve, a sixth valve and a fifteenth valve; the absorption chiller includes a second evaporator, a second absorber, a second generator and a second condenser; the outlet of the fifteenth valve is connected to the second generator, and the outlet of the second generator is connected to the outlet of the first generator and then connected to the inlet of the first circulating water pump; the external refrigeration return pipe is connected to the inlet of the second evaporator, and the outlet of the second evaporator is respectively connected to the eighteenth valve and the nineteenth valve, and the eighteenth valve is connected to the cold storage body, and the outlet of the cold storage body is connected to the outlet of the nineteenth valve and then connected to the external refrigeration water supply pipe.

[0011] In one embodiment, the second condenser, the second absorber and the radiator are connected to form a closed cycle.

[0012] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0013] The combined heat and cold supply system based on absorption technology of the present invention includes a high-temperature exhaust gas system, an absorption heating system and an absorption refrigeration system; by installing an absorption large temperature difference heat-transfer unit to increase the heat exchange intensity, reduce the recovery temperature of the heating pile, and increase the energy transmission capacity of the pipeline network, the overall heating performance can be improved. By installing an absorption refrigeration system, when there is no heating demand or the heating load is low in the summer, the generated hot water is used to drive the absorption chiller for refrigeration, realizing centralized cooling, which can improve utilization efficiency and economic benefits. Since the overall heating and cooling have large load fluctuations in different time periods, adding heat storage bodies and cold storage bodies can well adjust the system load and relieve the load regulation pressure. At the same time, it also prevents the system from overheating or overcooling, and improves the system's startup speed and adjustment response ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of a combined cooling and heating system based on absorption technology;

[0016] Among them, 1. high-temperature exhaust gas source; 2. first heat exchanger; 3. second heat exchanger; 4. fourth valve; 5. fifth valve; 6. sixth valve; 7. first circulation fan; 8. first circulation water pump; 9. ninth valve; 10. second circulation water pump, 11. first generator; 12. first condenser; 13. first absorber; 14. first evaporator; 15. fifteenth valve; 16. second generator; 17. second evaporator; 18. eighteenth valve; 19. nineteenth valve; 20. cold storage body; 21. second absorber; 22. second condenser; 23. heat storage body; 24. radiator. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0018] The purpose of the present invention is to provide a combined cooling and heating system based on absorption technology to solve the problems existing in the above-mentioned prior art, improve the overall performance of the system, and set up a heat storage system to facilitate system adjustment.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, the present invention provides a combined cooling and heating system based on absorption technology, comprising a high-temperature exhaust gas system, an absorption heating system, and an absorption refrigeration system. The high-temperature exhaust gas system includes a high-temperature exhaust gas source 1, a first heat exchanger 2, and a first circulating fan 7. The absorption heating system includes a second circulating water pump 10, a fourth valve 4, a fifth valve 5, a sixth valve 6, a ninth valve 9, a heat storage body 23, and an absorption-type large temperature difference heat exchanger unit. The absorption-type large temperature difference heat exchanger unit includes a first generator 11, a first condenser 12, a first evaporator 14, a first absorber 13, and a second heat exchanger 3. The absorption refrigeration system includes a fifteenth valve 15, an eighteenth valve 18, a nineteenth valve 19, a radiator 24, a cold storage body 20, and an absorption chiller. The absorption chiller includes a second generator 16, a second condenser 22, a second evaporator 17, and a second absorber 21.

[0021] The fourth valve 4 in the system is connected to the inlet of the thermal storage body 23, the fifth valve 5 is connected in parallel with the fourth valve 4, and the sixth valve 6 is connected to the inlet of the first generator 11 of the absorption heating system. The fifteenth valve 15 in the system is connected to the inlet of the second generator 16 of the absorption cooling system. The eighteenth valve 18 is connected to the inlet of the cold storage body 20, and the nineteenth valve 19 is connected in parallel with the eighteenth valve 18.

[0022] The exhaust gas outlet at the top of the high-temperature exhaust gas source 1 is connected to the first circulating fan 7, which is connected to the primary water inlet of the first heat exchanger 2. The primary water outlet of the first heat exchanger 2 is connected to the heat medium side inlet of the second heat exchanger 3, and the heat medium side outlet of the second heat exchanger 3 is connected to the return air port of the high-temperature exhaust gas source 1. The first heat exchanger 2 uses countercurrent heat exchange, and the first circulating water pump 8 is connected to the refrigerant side inlet of the first heat exchanger 2. The refrigerant side outlet of the first heat exchanger 2 is connected in parallel to the fourth valve 4 and the fifth valve 5. The fourth valve 4 is connected to the inlet of the thermal accumulator 23. The outlet of the thermal accumulator 23 is merged with the outlet of the fifth valve 5 and divided into three branches, which are respectively connected to the sixth valve 6, the fifteenth valve 15, and the ninth valve 9. The outlet of the ninth valve 9 is connected to the inlet of the first circulating water pump 8. The outlet of the sixth valve 6 is connected to the inlet of the first generator 11, which is then connected to the first circulating water pump 8. The refrigerant-side outlet of the second heat exchanger 3 is connected to the second circulating water pump 10, which is then connected to the inlet of the first evaporator 14. The outlet of the first evaporator 14 is then connected to the refrigerant-side return port of the second heat exchanger 3. The heating return water is split into two paths and enters the inlet of the first absorber 13. The outlet of the first absorber 13 is connected to the inlet of the first condenser 12, which is then connected to the heating and water supply pipeline. The outlet of the fifteenth valve 15 is connected to the inlet of the second generator 16. The outlet of the second generator 16 is connected to the outlet of the first generator 11 and then merges with the inlet of the first circulating water pump 8. The cooling return water is connected to the inlet of the second evaporator 17. The outlet of the second evaporator 17 is split into two paths and connected to the eighteenth and nineteenth valves 18 and 19. The eighteenth valve 18 is connected to the inlet of the cold storage body 20. The outlet of the cold storage body 20 is connected to the outlet of the nineteenth valve 19 and then merges with the cooling water supply pipeline. The second condenser 22 , the second absorber 21 , and the radiator 24 form a closed cycle to dissipate heat generated by the second absorber 21 and the second condenser 22 .

[0023] The present invention applies absorption technology to the field of combined cooling and heating, as follows:

[0024] High-temperature exhaust gas from high-temperature exhaust gas source 1 passes through first circulation fan 7 and enters first heat exchanger 2, where it heats secondary circulating water. During heating, first heat exchanger 2 generates hot water that drives first generator 11, while waste heat generated by second heat exchanger 3 flows to first evaporator 14. During cooling, the heat generated by first heat exchanger 2 flows to second generator 16 to drive hot water, generating cooling.

[0025] The heat source of the combined cooling and heating system based on absorption technology of the present invention is high-temperature industrial waste gas, and the high-temperature waste gas is cooled and converted into low-temperature waste gas, which is converted into waste heat for secondary utilization and absorption.

[0026] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0027] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A combined cooling and heating system based on absorption technology, characterized by: Including high temperature exhaust gas system, absorption heating system and absorption refrigeration system; The high-temperature exhaust gas system includes a high-temperature exhaust gas source, a first heat exchanger and a first circulation fan. The outlet of the high-temperature exhaust gas source is connected to the heat medium side inlet of the first heat exchanger through the first circulation fan, and the heat medium side outlet of the first heat exchanger is connected to the return port of the high-temperature exhaust gas source; the refrigerant side of the first heat exchanger is connected in parallel with the absorption heating system and the absorption refrigeration system; the absorption heating system includes an absorption large temperature difference heat exchange unit, and the absorption refrigeration system includes an absorption chiller.

2. The combined cooling and heating system based on absorption technology according to claim 1 is characterized in that: The absorption heating system includes a fifth valve, a sixth valve, an absorption large temperature difference heat exchange unit, and a first circulating water pump which are connected in series with the refrigerant side outlet of the first heat exchanger. The first circulating water pump is connected to the refrigerant side inlet of the first heat exchanger. A fourth valve is connected in parallel between the refrigerant side outlet of the first heat exchanger and the fifth valve. The fourth valve is connected to a heat storage body. After the end of the heat storage body is connected to the fifth valve, a ninth valve, an absorption refrigeration system and the sixth valve are connected in parallel. The ninth valve is connected to the first circulating water pump.

3. The combined cooling and heating system based on absorption technology according to claim 2 is characterized in that: The absorption type large temperature difference heat exchange unit includes a second heat exchanger and a first generator. The outlet of the first generator connected to the outlet of the sixth valve is connected to the first circulating water pump; the refrigerant side outlet of the second heat exchanger is connected to the first evaporator, and the outlet of the first evaporator is connected to the refrigerant side inlet of the second heat exchanger; the external heating return water pipes are respectively connected to the first absorber, the outlet of the first absorber is connected to the first condenser, and the outlet of the first condenser is connected to the external heating water supply pipe.

4. The combined cooling and heating system based on absorption technology according to claim 3 is characterized by: The heat medium side inlet of the second heat exchanger is connected to the heat medium side outlet of the first heat exchanger, and the heat medium side outlet of the second heat exchanger is connected to the return port of the high-temperature exhaust gas source; a second circulating water pump is provided between the refrigerant side outlet of the second heat exchanger and the first evaporator.

5. The combined cooling and heating system based on absorption technology according to claim 4 is characterized in that: The absorption refrigeration system includes a fifteenth valve, and the end of the heat storage body is connected to the fifth valve and then connected in parallel with a ninth valve, a sixth valve and a fifteenth valve; the absorption chiller includes a second evaporator, a second absorber, a second generator and a second condenser; the outlet of the fifteenth valve is connected to the second generator, and the outlet of the second generator is connected to the outlet of the first generator and then connected to the inlet of the first circulating water pump; the external refrigeration return pipe is connected to the inlet of the second evaporator, and the outlet of the second evaporator is respectively connected to the eighteenth valve and the nineteenth valve, and the eighteenth valve is connected to the cold storage body, and the outlet of the cold storage body is connected to the outlet of the nineteenth valve and then connected to the external refrigeration water supply pipe.

6. The combined cooling and heating system based on absorption technology according to claim 5 is characterized by: The second condenser, the second absorber and the radiator are connected to form a closed cycle.

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