A multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit

Abstract

This utility model discloses a multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit. It mainly consists of a large temperature difference heat exchanger unit circulation system, a primary network system, and a secondary network system. The large temperature difference heat exchanger unit circulation system comprises a generator, absorber, evaporator, condenser, solution heat exchanger, and plate heat exchanger. The primary network system comprises a primary network inlet pipe, a primary network outlet pipe, a heat exchanger, and a generator. The secondary network system comprises a secondary network inlet pipe, a heat exchanger, an absorber, and a condenser. This utility model utilizes a large temperature difference heat exchanger unit combined with multiple heat exchangers to exchange heat with multiple heat sources such as coal, natural gas, and industrial waste heat through the secondary network, thereby improving energy utilization efficiency, increasing the heating capacity of the pipeline network, and reducing the energy consumption and operating costs of the heating system.

Description

Technical Field

[0001] This utility model relates to the technical field of heating systems for large temperature difference heat exchange units, and in particular to a multi-zone variable temperature combined heating system based on a large temperature difference heat exchange unit. Background Technology

[0002] In recent years, northern my country has gradually phased out heat sources with high emissions and low energy efficiency, while restricting the construction of new coal-fired power plant projects. However, with the increase in urban population, the demand from users and the heating load continue to grow, the pressure on the pipeline network is increasing dramatically, and the cost of excavating and laying new pipelines is high. Therefore, there is an urgent need to increase heating capacity.

[0003] Large-scale heating networks cover a wide area, and the different building types, ages, and insulation levels lead to significant differences in heat load demand. Therefore, current district heating systems tend to operate with multiple heat sources coupled together, such as coal, gas, and industrial waste heat. However, the supply water temperatures of different heat sources are different, and traditional heat exchangers cannot effectively and economically extract heat from different heat sources under small temperature differences. At the same time, traditional heat exchangers also face the problem that when the primary network return water temperature is high, increasing the heat exchange capacity requires heat exchangers and water pumps with large flow rates, leading to increased operating energy consumption.

[0004] To increase the heating capacity of the pipeline network, reduce the energy consumption and operating costs of the heating system, and adapt to the temperature zones of different heat sources, replacing traditional plate heat exchangers with large temperature difference heat exchange units can basically alleviate the pressure on the pipeline network heating. Large temperature difference heat exchange units can significantly increase the temperature difference between the supply and return water, reduce the circulating water flow, and reduce system energy consumption and costs. Summary of the Invention

[0005] The purpose of this invention is to increase the heating capacity of the pipeline network, reduce the energy consumption and operating costs of the heating system, and adapt to the temperature of different heat sources. It proposes a multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit. This system regulates the heat exchange matching relationship between the primary network water and the absorption-type large temperature difference heat exchange unit through valves and multiple heat exchangers, independently meeting the personalized heating needs of different temperature heat sources, achieving multi-zone variable temperature combined heating based on the large temperature difference heat exchanger unit; overcoming pipeline pressure, increasing the primary network supply and return water temperature, and reducing the primary network water flow rate.

[0006] This utility model describes a multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit, mainly composed of a primary network system, a secondary network system, and a large temperature difference heat exchanger unit circulation system; the large temperature difference heat exchanger unit circulation system consists of an evaporator 101, a condenser 102, a generator 103, a solution heat exchanger 104, an absorber 105, a plate heat exchanger 106, a primary network inlet pipe A1 in the first low temperature zone, a primary network outlet pipe A2 in the second low temperature zone, a secondary network inlet pipe B1 in the low temperature zone, and a secondary network outlet pipe B2 in the first low temperature zone; the primary network inlet pipe C1 in the high temperature zone I, the primary network outlet pipe C2 in the high temperature zone II, the primary network inlet pipe C3 in the high temperature zone II, the primary network outlet pipe C4 in the high temperature zone III, the primary network inlet pipe C5 in the high temperature zone III, the primary network outlet pipe C6 in the high temperature zone III, the primary network inlet pipe C7 in the high temperature zone II, and the primary network outlet pipe C8 in the first low temperature zone I... The primary network system consists of a secondary network inlet pipe A1, a second low-temperature zone primary network outlet pipe A2, a generator 103, a plate heat exchanger 106, a first primary network heat exchanger 201, a second primary network heat exchanger 202, a third primary network heat exchanger 203, an nth primary network heat exchanger 20n, a first valve 401, a second valve 402, a third valve 403, a fourth valve 404, and a fifth valve 405; the secondary network system consists of a secondary network inlet pipe B1, a first low-temperature zone secondary network outlet pipe B2, a second secondary network outlet pipe B3, a condenser 102, an absorber 105, a plate heat exchanger 106, a first secondary network heat exchanger 301, a second secondary network heat exchanger 302, a third secondary network heat exchanger 303, an nth secondary network heat exchanger 30n, a first valve 401, a first butterfly valve 501, a second butterfly valve 502, a third butterfly valve 503, and an nth butterfly valve 50n. Attached Figure Description

[0007] Figure 1This is a schematic diagram of the structure described in this utility model. The serial numbers in the diagram are: 101—Evaporator, 102—Condenser, 103—Generator, 104—Solution Heat Exchanger, 105—Absorber, 106—Plate Heat Exchanger, 201—First Primary Heat Exchanger, 202—Second Primary Heat Exchanger, 203—Third Primary Heat Exchanger, 20n—Nth Primary Heat Exchanger, 301—First Secondary Heat Exchanger, 302—Secondary Secondary Heat Exchanger, 303—Third Secondary Heat Exchanger, 30n—Nth Secondary Heat Exchanger, 401—First Valve, 402—Second Valve, 403—Third Valve, 404—Fourth Valve, 405—Fifth Valve, 501—First Butterfly Valve, 502—Second Butterfly Valve, 503—Third Butterfly Valve, 50n—Nth Butterfly Valve. A1—Primary network inlet pipe in low temperature zone, A2—Primary network outlet pipe in low temperature zone, B1—Secondary network inlet pipe, B2—Secondary network outlet pipe in the first low temperature zone, B3—Secondary network outlet pipe in the second secondary network, C1—Primary network inlet pipe in high temperature zone I, C2—Primary network outlet pipe in high temperature zone I, C3—Primary network inlet pipe in high temperature zone II, C4—Primary network outlet pipe in high temperature zone II, C5—Primary network inlet pipe in high temperature zone III, C6—Primary network outlet pipe in high temperature zone III, C7—Primary network inlet pipe in high temperature zone n, C8—Primary network outlet pipe in high temperature zone n. Detailed Implementation

[0008] like Figure 1The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit shown includes an evaporator 101, a condenser 102, a generator 103, a solution heat exchanger 104, an absorber 105, a plate heat exchanger 106, a large temperature difference heat exchanger unit circulation system consisting of a primary network inlet pipe A1 in the low-temperature zone, a primary network outlet pipe A2 in the low-temperature zone, a secondary network inlet pipe B1, and a secondary network outlet pipe B2 in the first low-temperature zone; and a primary network inlet pipe C1 in the high-temperature zone I, a primary network outlet pipe C2 in the high-temperature zone II, a primary network inlet pipe C3 in the high-temperature zone II, a primary network outlet pipe C4 in the high-temperature zone III, a primary network inlet pipe C5 in the high-temperature zone III, a primary network outlet pipe C6 in the high-temperature zone n, a primary network inlet pipe C7 in the high-temperature zone n, a primary network outlet pipe C8 in the high-temperature zone n, a primary network inlet pipe A1 in the low-temperature zone, and a primary network outlet pipe A2 in the second low-temperature zone. 2. A primary network system consisting of generator 103, plate heat exchanger 106, first primary network heat exchanger 201, second primary network heat exchanger 202, third primary network heat exchanger 203, nth primary network heat exchanger 20n, first valve 401, second valve 402, third valve 403, fourth valve 404, and fifth valve 405; a secondary network system consisting of secondary network inlet pipe B1, first low-temperature zone secondary network outlet pipe B2, second secondary network outlet pipe B3, condenser 102, absorber 105, plate heat exchanger 106, first secondary network heat exchanger 301, second secondary network heat exchanger 302, third secondary network heat exchanger 303, nth secondary network heat exchanger 30n, first valve 401, first butterfly valve 501, second butterfly valve 502, third butterfly valve 503, and nth butterfly valve 50n.

[0009] Large temperature difference heat exchanger unit circulation system: The low-temperature hot water from the primary network enters the generator 103 through the primary network inlet pipe A1 in the low-temperature zone to release heat. It then passes through the plate heat exchanger 106 via the second valve 402, exchanges heat with the secondary network water, and then enters the evaporator 101. The primary network water heats the concentrated solution in the generator 103 to generate steam. The steam enters the condenser 102, is condensed by the secondary network water, and then enters the evaporator 101 through a U-tube to evaporate. It then enters the absorber 105 to be absorbed by the concentrated solution to become a dilute solution. The dilute solution exchanges heat with the concentrated solution from the generator 103 via the solution heat exchanger 104 and then enters the generator 103 to generate circulation. It should be noted that the secondary network is divided by the first valve 401, entering the absorber 105 and the plate heat exchanger 106 respectively.

[0010] Primary network system: Low-temperature primary network water enters generator 103 through the low-temperature zone primary network inlet pipe A1, where it is heated to a dilute solution. A portion is diverted through the second valve 402 to the plate heat exchanger 106 and then to the evaporator 101. Another portion of the low-temperature primary network water is diverted through the third valve 403 to the first primary network heat exchanger 201, where it exchanges heat with the high-temperature zone I primary network inlet pipe C1 before entering the first secondary network heat exchanger 301, where it exchanges heat with the second secondary network outlet pipe B3. The remaining low-temperature primary network water is diverted through the fourth valve 404 to the second primary network heat exchanger 202, where it exchanges heat with... After heat exchange in the primary network inlet pipe C3 of the high-temperature zone II, the water enters the secondary network heat exchanger 302 and then exchanges heat with the secondary network outlet pipe B3. The remaining low-temperature primary network water is diverted through the fifth valve 405 to the third primary network heat exchanger 203 to exchange heat with the primary network inlet pipe C5 of the high-temperature zone III, and then enters the third secondary network heat exchanger 303 for heat exchange. Similarly, the remaining low-temperature zone primary network water is partially diverted in the nth primary network heat exchanger 20n within the dotted frame, exchanges heat with the primary network inlet pipe C7 of the high-temperature zone n, exchanges heat with the secondary network water in the nth secondary network heat exchanger 30n, and finally mixes and enters the evaporator 101.

[0011] Secondary network system: Secondary network water enters through the secondary network inlet pipe B1 and is diverted through the first valve 401, the first butterfly valve 501, the second butterfly valve 502, and the third butterfly valve 503. Part of it enters the absorber 105 to participate in the circulation system of the large temperature difference heat exchanger unit and is supplied through the secondary network outlet pipe B2 of the first low temperature zone; part of it enters the plate heat exchanger 106 for heat exchange; part of it enters the first secondary network heat exchanger 301 to exchange heat with the primary network water in zone I; part of it enters the second secondary network heat exchanger 302 to exchange heat with the primary network water in zone II; part of it enters the third secondary network heat exchanger 303 to exchange heat with the primary network water in zone III; and so on. The remaining secondary network water enters the nth secondary network heat exchanger 30n to exchange heat with the primary network water in zone n; finally, the secondary network water from the plate heat exchanger 106 is mixed with the secondary network water from zones I, II, III, and n and is supplied through the second secondary network outlet pipe B3.

[0012] It should be noted that the zones are divided according to the actual situation, and the primary network hot water temperature within the dotted frame is higher than that of the primary network inlet pipe A1 in the low-temperature zone.

[0013] It should be noted that plate heat exchanger 106 belongs to the circulation system of large temperature difference heat exchange unit; when the primary network temperature is uniform, all heat exchangers within the dotted frame can be closed through valves.

[0014] This invention fully utilizes the heat from the primary heat network to improve energy efficiency and increase the heating capacity of the pipeline network. It separates multiple heat sources for zoned heat exchange, allowing high-grade heat sources to directly exchange heat with the primary network, thus avoiding excessively high temperatures entering the evaporator. The heat sources then exchange heat again with the secondary network, reducing the loss of high-grade heat sources and lowering the energy consumption and operating costs of the heating system. The system operates with multiple heat sources and multiple temperature conditions coupled together, allowing for flexible matching of different users' water supply temperature requirements through valve adjustments, enhancing the flexibility and adaptability of the heating system.

[0015] The above description is merely an application example of this utility model and does not limit the patent scope of this utility model. Any equivalent structure made using the content of this specification and drawings, whether directly or indirectly applied in related technical fields, is similarly included within the patent protection scope of this utility model.

Claims

1. A multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit, characterized in that, The system includes an evaporator (101), a condenser (102), a generator (103), a solution heat exchanger (104), an absorber (105), a plate heat exchanger (106), a first primary heat exchanger (201), a second primary heat exchanger (202), a third primary heat exchanger (203), an nth primary heat exchanger (20n), a first secondary heat exchanger (301), a second secondary heat exchanger (302), a third secondary heat exchanger (303), an nth secondary heat exchanger (30n), a first valve (401), a second valve (402), a third valve (403), a fourth valve (404), and a fifth valve. Door (405), First butterfly valve (501), Second butterfly valve (502), Third butterfly valve (503), Nth butterfly valve (50n), Low-temperature zone primary network inlet pipe (A1), Low-temperature zone primary network outlet pipe (A2), Secondary network inlet pipe (B1), First low-temperature zone secondary network outlet pipe (B2), Second secondary network outlet pipe (B3), High-temperature zone I primary network inlet pipe (C1), High-temperature zone I primary network outlet pipe (C2), High-temperature zone II primary network inlet pipe (C3), High-temperature zone II primary network outlet pipe (C4), High-temperature zone III primary network inlet pipe (C5), High-temperature zone III primary network outlet pipe (C6), High-temperature zone n primary network inlet pipe ( C7), high-temperature zone n primary network outlet pipe (C8); the large temperature difference heat exchanger unit circulation system composed of the evaporator (101), condenser (102), generator (103), solution heat exchanger (104), absorber (105), plate heat exchanger (106), low-temperature zone primary network inlet pipe (A1), low-temperature zone primary network outlet pipe (A2), secondary network inlet pipe (B1), and first low-temperature zone secondary network outlet pipe (B2); the high-temperature zone I primary network inlet pipe (C1), high-temperature zone I primary network outlet pipe (C2), high-temperature zone II primary network inlet pipe (C3), high-temperature zone II primary network outlet pipe (C4), high-temperature zone III primary network outlet pipe (C4), and high-temperature zone II primary network outlet pipe (C5). The primary network system consists of the following components: primary network inlet pipe (C5), primary network outlet pipe (C6) of high temperature zone III, primary network inlet pipe (C7) of high temperature zone n, primary network outlet pipe (C8) of high temperature zone n, primary network inlet pipe (A1) of low temperature zone, primary network outlet pipe (A2) of low temperature zone, generator (103), plate heat exchanger (106), first primary network heat exchanger (201), second primary network heat exchanger (202), third primary network heat exchanger (203), nth primary network heat exchanger (20n), first valve (401), second valve (402), third valve (403), fourth valve (404), and fifth valve (405).The secondary network system comprises the secondary network inlet pipe (B1), the first low-temperature zone secondary network outlet pipe (B2), the second secondary network outlet pipe (B3), the condenser (102), the absorber (105), the plate heat exchanger (106), the first secondary network heat exchanger (301), the second secondary network heat exchanger (302), the third secondary network heat exchanger (303), the nth secondary network heat exchanger (30n), the first valve (401), the first butterfly valve (501), the second butterfly valve (502), the third butterfly valve (503), and the nth butterfly valve (50n).

2. The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit according to claim 1, characterized in that: The low-temperature hot water from the primary network of the large temperature difference heat exchanger unit circulation system enters the generator (103) through the primary network inlet pipe (A1) in the low-temperature zone to release heat. It then passes through the plate heat exchanger (106) via the second valve (402) and exchanges heat with the secondary network water before entering the evaporator (101). The primary network water heats the concentrated solution in the generator (103) to generate steam. The steam enters the condenser (102), is condensed by the secondary network water, and then enters the evaporator (101) through the U-tube to evaporate. It then enters the absorber (105) to be absorbed by the concentrated solution to become a dilute solution. The dilute solution exchanges heat with the concentrated solution coming out of the generator (103) through the solution heat exchanger (104) and then enters the generator (103) to generate circulation.

3. The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit according to claim 1, characterized in that: The low-temperature primary network water of the primary network system enters the generator (103) through the low-temperature zone primary network inlet pipe (A1) and is heated to a dilute solution. After passing through the second valve (402), a portion of the water is diverted to the plate heat exchanger (106) and then to the evaporator (101). Another portion of the low-temperature primary network water is diverted through the third valve (403) and enters the first primary network heat exchanger (201). After exchanging heat with the high-temperature zone I primary network inlet pipe (C1), the water enters the first secondary network heat exchanger (301) and then exchanges heat with the second secondary network outlet pipe (B3). The remaining low-temperature primary network water is diverted through the fourth valve (404) and enters the second primary network heat exchanger (202). After exchanging heat with the primary network inlet pipe (C3) of the high-temperature zone II, the water enters the secondary network heat exchanger (302) and then exchanges heat with the secondary network outlet pipe (B3). The remaining low-temperature primary network water is diverted through the fifth valve (405) to the third primary network heat exchanger (203) to exchange heat with the primary network inlet pipe (C5) of the high-temperature zone III, and then enters the third secondary network heat exchanger (303) for heat exchange. Similarly, the remaining low-temperature zone primary network water repeats part of the nth primary network heat exchanger (20n) within the dotted frame, exchanges heat with the primary network inlet pipe (C7) of the high-temperature zone n, exchanges heat with the secondary network water in the nth secondary network heat exchanger (30n), and finally mixes and enters the evaporator (101).

4. The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit according to claim 1, characterized in that: The secondary network water of the secondary network system passes through the secondary network inlet pipe (B1) and is divided by the first valve (401), the first butterfly valve (501), the second butterfly valve (502), and the third butterfly valve (503). Part of it enters the absorber (105) to participate in the circulation system of the large temperature difference heat exchanger unit and is supplied through the secondary network outlet pipe (B2) of the first low temperature zone. Part of it enters the plate heat exchanger (106) for heat exchange. Part of it enters the first secondary network heat exchanger (301) to exchange heat with the primary network water of zone I. Part of it enters the second secondary network heat exchanger (302) to exchange heat with the primary network water of zone II. Part of it enters the third secondary network heat exchanger (303) to exchange heat with the primary network water of zone III. And so on. The remaining secondary network water enters the nth secondary network heat exchanger (30n) to exchange heat with the primary network water of zone n. Finally, the secondary network water through the plate heat exchanger (106) is mixed with the secondary network water of zone I, zone II, zone III, and zone n and is supplied through the second secondary network outlet pipe (B3).

5. The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit according to claim 1, characterized in that: The secondary network is diverted through the first valve (401) and enters the absorber (105) and the plate heat exchanger (106) respectively.

6. The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit according to claim 1, characterized in that: Plate heat exchanger (106) belongs to the circulation system of large temperature difference heat exchange unit; when the primary network temperature is uniform, all heat exchangers in the dotted frame can be closed by valves.

7. The multi-zone variable temperature combined heating system based on a large temperature difference heat exchanger unit according to claim 1, characterized in that: The zones are divided according to the actual situation, and the primary network hot water temperature in the dotted frame is higher than that in the primary network inlet pipe (A1) of the low-temperature zone.

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