CN210717774U

CN210717774U - Low-temperature hot water driven absorption type large-temperature-difference heat exchange unit

Info

Publication number: CN210717774U
Application number: CN201921424236.2U
Authority: CN
Inventors: 李绍飞; 黄国华; 谷再丰; 常晟; 秦冰
Original assignee: Tongfang Energy Saving Engineering Technology Co ltd
Current assignee: Tongfang Energy Saving Engineering Technology Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-06-09
Anticipated expiration: 2029-08-30

Abstract

An absorption type large-temperature-difference heat exchange unit driven by low-temperature hot water relates to the technical field of heating equipment. The utility model discloses a generator, condenser, low pressure absorber, evaporimeter, high pressure absorber, high temperature generator and water plate heat exchanger. The structure is characterized in that the low-pressure absorber and the evaporator form a low-pressure cylinder, the high-pressure absorber and the high-temperature generator form a medium-pressure cylinder, and the generator and the condenser form a high-pressure cylinder. Its circulating system is divided into external pressurized water channel and internal vacuum loop. Compared with the prior art, the utility model discloses can be at drive heat source temperature 55-80 ℃ time normal operating, and can effectively reduce heat supply network return water temperature degree, the hot water supply return water difference in temperature of once inclines in the increase, increases the carrying capacity of heat supply network.

Description

Low-temperature hot water driven absorption type large-temperature-difference heat exchange unit

Technical Field

The utility model relates to a heating equipment technical field especially is used for the absorption heat exchanger group of heating heat supply, can be applied to the lower occasion of hot water quality such as central heating's second grade station, solar hot water utilization, steam condensate degree of depth utilization.

Background

With the increase of the scale of urban centralized heat supply year by year, high-temperature hot water generated by a centralized heat source can reach a heat supply area only by being conveyed for a long distance, and under the condition of the same heat supply amount, the temperature difference between water supply and return water is increased to reduce the water supply flow, so that the initial investment of a pipeline is reduced. Meanwhile, the power consumption of the water pump can be reduced, so that the heat supply energy consumption and the heat supply cost can be reduced.

In the prior art, Chinese patent 'a heat pump type heat exchange unit' proposes that the supply and return water temperature of hot water of a centralized heat supply primary network is generally about 130-60 ℃, and in the embodiment, the supply and return water temperature of the primary network is 130-25 ℃, and the supply and return water temperature difference reaches 105 ℃. In most areas of urban central heating at present, the temperature of primary network water supply is not up to 130 ℃, and particularly in the early and late stages of heating, the temperature of primary network water supply is basically only 60-80 ℃. In some district heating areas, the temperature of the primary network supply water running all year round is 55-80 ℃. At the moment, due to the working characteristics of the conventional absorption heat exchanger unit, the temperature of a driving heat source is reduced, so that the return water temperature of the primary network is higher than 25 ℃, and even the unit cannot operate. Therefore, when the temperature of the primary network supply water is low in practical application, the absorption heat exchanger unit is not suitable for the type.

Disclosure of Invention

To the not enough of existence among the above-mentioned prior art, the utility model aims at providing a big difference in temperature heat exchanger unit of low temperature hot water driven absorption formula. The water heater can normally operate when the temperature of a driving heat source is 55-80 ℃, and can effectively reduce the temperature of return water of a heat supply network, increase the temperature difference of supply and return water of hot water at the primary side and increase the conveying capacity of the heat supply network.

In order to achieve the above object, the technical solution of the present invention is implemented as follows:

the absorption type large temperature difference heat exchange unit driven by low-temperature hot water comprises a generator, a condenser, a low-pressure absorber, an evaporator, a high-pressure absorber, a high-temperature generator and a water-plate heat exchanger. The structure is characterized in that the low-pressure absorber and the evaporator form a low-pressure cylinder, the high-pressure absorber and the high-temperature generator form a medium-pressure cylinder, and the generator and the condenser form a high-pressure cylinder. Its circulating system is divided into external pressurized water channel and internal vacuum loop. The external pressurized water path is divided into a primary network water path and a secondary network water path, and the primary network water path sequentially passes through the high-temperature generator, the water-water plate type heat exchanger and the evaporator; the secondary network water path is connected in parallel with two paths, one path sequentially passes through the low-pressure absorber, the high-pressure absorber and the condenser, the other path passes through the water-plate type heat exchanger, and the two paths are mixed and then flow out of the unit. The internal loop is divided into a solution loop and a refrigerant loop, the solution loop is divided into two independent paths, one path of solution sequentially passes through the low-pressure absorber and the high-temperature generator and then returns to the low-pressure absorber, and the circulation is repeated; the other path of solution passes through the high-pressure absorber and the generator in sequence and then returns to the high-pressure absorber to circulate. The refrigerant circuit is from the condenser to the evaporator.

In the absorption type large temperature difference heat exchange unit driven by the low-temperature hot water, the low-pressure cylinder and the middle-pressure cylinder are separately arranged or integrally arranged.

The utility model discloses owing to adopted above-mentioned structure, three barrel has constituted the pressure of three difference, and three pressure has brought the segmentation cooling/intensification, can show and incline hydrothermal supply return water difference in temperature in the increase central heating system, reduces heat supply network return water temperature, increases heat supply network transport capacity. Because the utility model discloses heat supply return water temperature reduces, and return water pipeline does not have heat preservation and thermal stress compensation problem, can reduce the investment of return water pipe network and whole pipe network.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

Referring to fig. 1, the absorption type large temperature difference heat exchanger unit driven by low temperature hot water of the utility model comprises a generator G2, a condenser C, a low pressure absorber a, an evaporator E, a high pressure absorber a2, a high temperature generator G and a water-plate heat exchanger w.hex. The low-pressure absorber A and the evaporator E form a low-pressure cylinder, the high-pressure absorber A2 and the high-temperature generator G form a medium-pressure cylinder, the generator G2 and the condenser C form a high-pressure cylinder, and the low-pressure cylinder and the medium-pressure cylinder are separately or integrally arranged. The utility model discloses the circulation system of unit divide into outside area and presses water route and inside vacuum circuit. The external pressurized water path is divided into a primary network water path and a secondary network water path, and the primary network water path sequentially passes through a high-temperature generator G, a generator G2, a water-water plate heat exchanger W.HEX and an evaporator E; the secondary network water path is connected in parallel with two paths, one path sequentially passes through the low-pressure absorber A, the high-pressure absorber A2 and the condenser C, the other path passes through the water-water plate type heat exchanger W.HEX, and the two paths are mixed and then flow out of the unit. The internal circuit is divided into a solution circuit and a refrigerant circuit. The solution loop is divided into two independent paths, one path of solution sequentially passes through the low-pressure absorber A and the high-temperature generator G and then returns to the low-pressure absorber A, and the circulation is repeated; the other path of solution passes through a high-pressure absorber A2 and a generator G2 in sequence and then returns to the high-pressure absorber A2 to circulate. The refrigerant circuit is from the condenser C to the evaporator E.

The utility model provides a step utilization solution of the middle and low temperature energy of central heating hot water to can provide heating or life hot water. When the central heating hot water cooling system works, the central heating hot water sequentially passes through the four stages of cooling of the high-temperature generator G, the generator G2, the water-plate heat exchanger W.HEX and the evaporator E, so that the return water temperature of the central heating hot water is greatly reduced. Because of the special structure of the medium-pressure cylinder and the high-pressure cylinder, the utility model can drive the hot water to have a usable temperature of 55-80 ℃.

The utility model discloses the structure is particularly useful for once the lower area and the occasion of side water supply temperature, even at heating first and last stage, equipment also can obtain effective utilization. The utility model discloses compare traditional plate-type heat exchanger group, it is lower to incline side return water temperature, is less than secondary side return water temperature moreover to retrieve low-grade heat energy for the heat source factory and created the condition, improved system's comprehensive energy utilization efficiency. In addition, to some areas, central heating hot water temperature condition is low, also can consider to adopt the utility model discloses absorption heat exchanger unit improves, and also has good adaptability to heat supply beginning and end.

Claims

1. The absorption type large temperature difference heat exchange unit driven by low-temperature hot water comprises a generator (G2), a condenser (C), a low-pressure absorber (A), an evaporator (E), a high-pressure absorber (A2), a high-temperature generator (G) and a water-plate heat exchanger (W.HEX); the low-pressure absorber (A) and the evaporator (E) form a low-pressure cylinder, the high-pressure absorber (A2) and the high-temperature generator (G) form a medium-pressure cylinder, and the generator (G2) and the condenser (C) form a high-pressure cylinder; the circulating system of the system is divided into an external pressurized water path and an internal vacuum loop, the external pressurized water path is divided into a primary network water path and a secondary network water path, and the primary network water path sequentially passes through a high-temperature generator (G), a generator (G2), a water-water plate heat exchanger (W.HEX) and an evaporator (E); the secondary network water path is connected in parallel with two paths, one path sequentially passes through a low-pressure absorber (A), a high-pressure absorber (A2) and a condenser (C), the other path passes through a water-water plate type heat exchanger (W.HEX), and the two paths are mixed and then flow out of the unit; the internal loop is divided into a solution loop and a refrigerant loop, the solution loop is divided into two independent paths, one path of solution sequentially passes through the low-pressure absorber (A) and the high-temperature generator (G) and then returns to the low-pressure absorber (A), and the circulation is repeated; the other path of solution passes through a high-pressure absorber (A2) and a generator (G2) in sequence and then returns to the high-pressure absorber (A2) to circulate; the refrigerant circuit is from the condenser (C) to the evaporator (E).

2. The low-temperature hot-water-driven absorption-type large-temperature-difference heat exchanger unit according to claim 1, wherein the low-pressure cylinder and the intermediate-pressure cylinder are arranged separately or integrally.