CN114135917A

CN114135917A - Can realize absorption heat exchanger group and heating system of multizone heat supply

Info

Publication number: CN114135917A
Application number: CN202111398950.0A
Authority: CN
Inventors: 黄国华; 赵金姊; 李更生; 王磊; 刘海涛; 崔艳; 谢晓云; 江亿
Original assignee: Taian Taishan District Heating Co ltd; TONGFANG ENERGY-SAVING ENGINEERING TECHNOLOGY CO LTD; Tsinghua University
Current assignee: Taian Taishan District Heating Co ltd; TONGFANG ENERGY-SAVING ENGINEERING TECHNOLOGY CO LTD; Tsinghua University
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-03-04

Abstract

An absorption heat exchanger unit capable of realizing multi-zone heat supply and a heat supply system relate to the technical field of absorption heat exchangers. The primary water flows through the first generator and the second generator in series and then enters each heat exchanger. The first heat exchanger, the second heat exchanger and the third heat exchanger are connected in parallel with water for the first time, are mixed after heat exchange, and are connected in series to enter the second evaporator and the first evaporator. The leading-out points of the primary water entering the four-n heat exchangers can be arranged in front of the first generator, behind the first generator or behind the second generator. The zone I secondary water enters the condenser I and the heat exchanger I in parallel, the zone II secondary water enters the absorber I and the heat exchanger II in parallel, the zone III secondary water enters the heat exchanger III, the absorber II and the condenser II in parallel, and the secondary water connection mode of the absorber II and the condenser II can also be in series connection. And respectively feeding the secondary water in the four-n partitions into the four-n heat exchangers for heat exchange and temperature rise. The invention realizes the heat regulation among the subareas by one machine with multiple supplies, effectively reduces the mutual influence among the subareas, and has the characteristics of simple structure and flexible and convenient regulation.

Description

Can realize absorption heat exchanger group and heating system of multizone heat supply

Technical Field

The invention relates to the technical field of absorption heat exchangers, in particular to an absorption heat exchanger unit and a heat supply system capable of realizing multi-zone heat supply.

Background

With the acceleration of the urbanization process in China, the proportion of heating area and energy consumption is continuously increased. Meanwhile, more than 50% of industrial energy consumption in China is converted into industrial waste heat. By adopting the absorption type large-temperature-difference heat exchange unit for heating, the temperature of return water of a primary network can be reduced to be lower than that of return water of a secondary network, the temperature difference of supply return water is obviously enlarged, waste heat recovery is facilitated, primary energy consumption is reduced, initial investment of a transmission and distribution pipeline is reduced, and power consumption of a water pump in the operation process of the system is reduced.

In the secondary network heating system, the height of a building and the pressure bearing capacity of an indoor heat exchanger limit, the heating system needs to be vertically partitioned, and the heating load and the pressure parameters of each partition are different. At present, the existing multi-partition absorption type large-temperature-difference heat exchange units and heating systems in the market are at most double partitions, and a plurality of absorption type heat exchange units are required to be configured for systems with 3 partitions or more, so that the investment is increased, and the occupied area is increased.

Chinese patent CN 210801354U proposes to use absorption heat pump + n plates to exchange and bear n partition loads, and the flow is shown in fig. 1. There are many ways of connecting the primary network, only one of which is illustrated here. In the process, the absorption heat pump and the heat exchanger 1 bear the load of the subarea 1, and the plate exchangers 2-n bear the load of the subareas 2-n respectively. The technology has less load adjusting means and larger mutual influence of load among the subareas when the subareas are in the 2-n variable working condition.

Chinese patent CN 213066268U proposes that N-stage heat exchanger units and N heat exchangers are used to realize multi-zone heating, which is called as a novel absorption type large temperature difference heat exchanger unit with multiple plate systems, and the flow is shown in fig. 2. The process can reduce the mutual influence of the load among the partitions to the maximum extent when the load of each partition changes. However, for realizing N-stage heat exchange by one unit, the unit structure design has considerable difficulty, so that the method is only suitable for being applied to double systems.

Another form proposed by chinese patent CN 213066268U is: in the 2-stage heat exchange system, 2 absorbers and 2 condensers are respectively connected with a heat exchanger in parallel to bear the load of 4 heat exchange subareas. This approach is only suitable for use in systems where the four partitions are not loaded much.

In summary, for several systems with large load difference in different zones, there is no absorption heat exchanger unit and heating system with simple structure and flexible and accurate adjustment in the prior art.

Disclosure of Invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides an absorption heat exchanger unit and a heat supply system capable of implementing multi-zone heat supply. The heat regulation among the partitions is realized by one machine with multiple supplies, the mutual influence among the partitions is effectively reduced, and the heat regulation device has the characteristics of simple structure and flexible and convenient regulation.

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

an absorption heat exchanger unit and a heat supply system capable of realizing multi-zone heat supply comprise a double-stage absorption heat pump unit and n heat exchangers (n is a natural number). The two-stage absorption heat pump unit consists of a first condenser, a second condenser, a first absorber, a second absorber, a first generator, a second generator, a first evaporator and a second evaporator. The structure is characterized in that primary water flows through the first generator and the second generator in series and then enters each heat exchanger. The first heat exchanger, the second heat exchanger and the third heat exchanger are connected in parallel with water for the first time, are mixed after heat exchange, and are connected in series to enter the second evaporator and the first evaporator. The modes of the primary water entering the heat exchanger four-n are various, and the primary water is connected in series, in parallel or in series-parallel. The leading-out points of the primary water entering the four-n heat exchangers can be arranged in front of the first generator, behind the first generator or behind the second generator. The zone I secondary water enters the condenser I and the heat exchanger I in parallel, the zone II secondary water enters the absorber I and the heat exchanger II in parallel, the zone III secondary water enters the heat exchanger III, the absorber II and the condenser II in parallel, and the secondary water connection mode of the absorber II and the condenser II can also be in series connection. And respectively feeding the secondary water in the four-n partitions into the four-n heat exchangers for heat exchange and temperature rise.

Due to the adoption of the structure, compared with the prior art, the invention has the following beneficial effects:

(1) when the load difference among a plurality of subareas is large, the system of the invention is adopted to realize one machine for multiple supplies;

(2) when the load of any partition changes, other partitions can meet the heat supply requirement;

(3) the mutual influence degree of the load among the partitions is reduced to the minimum;

(4) the load adjusting method of each subarea is flexible and diverse;

(5) the structural design and the pipe connection of the unit are simple.

The invention is further described with reference to the following figures and detailed description.

Drawings

FIG. 1 is a schematic diagram of a prior art heating system;

FIG. 2 is a schematic diagram of another prior art heating system;

FIG. 3 is a schematic diagram of a third prior art heating system;

FIG. 4 is a schematic diagram of the heating system of the present invention;

FIG. 5 is a schematic diagram of the system of the present invention according to an embodiment of the present invention.

Detailed Description

Referring to fig. 4, the absorption heat exchanger unit and the heat supply system capable of realizing multi-zone heat supply of the present invention includes a two-stage absorption heat pump unit 1 and n heat exchangers (n is a natural number), wherein the two-stage absorption heat pump unit 1 is composed of a first condenser 2, a second condenser 3, a first absorber 8, a second absorber 9, a first generator 4, a second generator 5, a first evaporator 6 and a second evaporator 7, and primary water flows through the first generator 4 and the second generator 5 in series and then enters each heat exchanger. The first heat exchanger 10, the second heat exchanger 11 and the third heat exchanger 12 are connected in parallel with water for the first time, mixed after heat exchange, and connected in series to enter the second evaporator 7 and the first evaporator 6. The modes of the primary water entering the heat exchanger four-n are various, and the primary water is connected in series, in parallel or in series-parallel. The leading-out points of the primary water entering the heat exchanger four-n can be arranged in front of the first generator 4, behind the first generator 4 or behind the second generator 5. The zone one secondary water enters the condenser I2 and the heat exchanger I10 in parallel, the zone two secondary water enters the absorber I8 and the heat exchanger II 11 in parallel, the zone three secondary water enters the heat exchanger III 12, the absorber II 9 and the condenser II 3 in parallel, and the secondary water connection mode of the absorber II 9 and the condenser II 3 can also be in series connection. And respectively feeding the secondary water in the four-n partitions into the four-n heat exchangers for heat exchange and temperature rise.

Referring to fig. 5, the absorption heat exchanger unit and the heating system of the present invention are composed of a two-stage absorption heat pump unit 1, four heat exchangers and auxiliary pipelines.

The waterway part is as follows: the primary water supply firstly enters each stage of generator in series, then enters each heat exchanger in parallel, is mixed after heat exchange, and enters each stage of evaporator in series for cooling again.

And the secondary water of the first partition is divided into two paths, and the two paths are connected in parallel and enter a first condenser 2 and a first heat exchanger 10 of the double-stage absorption heat pump unit 1.

And the secondary water in the second partition is divided into two paths and enters the first absorber 8 and the second heat exchanger 11 of the double-stage absorption heat pump unit 1 in parallel.

And the secondary water of the third partition is divided into two paths, and the two paths are connected in parallel to enter a heat exchanger III 12 and an absorber II 9 and a condenser II 3 of the double-stage absorption heat pump unit 1, wherein the absorber II 9 and the condenser II 3 are connected in series.

Or dividing the secondary water of the third partition into three paths, and enabling the three paths to enter a heat exchanger III 12 and an absorber II 9 and a condenser II 3 of the double-stage absorption heat pump unit 1 in parallel, wherein the connection mode of the absorber II 9 and the condenser II 3 is parallel.

And the secondary water in the fourth partition enters a heat exchanger IV 13 for heat exchange and temperature rise.

The invention has been described with reference to the above examples. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention, and these alternatives and modifications are intended to be within the scope of the invention.

Claims

1. An absorption heat exchange unit capable of realizing multi-zone heat supply and a heat supply system comprise a double-stage absorption heat pump unit (1) and n heat exchangers (n is a natural number), wherein the double-stage absorption heat pump unit (1) consists of a first condenser (2), a second condenser (3), a first absorber (8), a second absorber (9), a first generator (4), a second generator (5), a first evaporator (6) and a second evaporator (7); the method is characterized in that primary water flows through a first generator (4) and a second generator (5) in series and then enters each heat exchanger, wherein the primary water among the first heat exchanger (10), the second heat exchanger (11) and the third heat exchanger (12) is connected in parallel, mixed after heat exchange and then enters a second evaporator (7) and a first evaporator (6) in series; the modes of the primary water entering the heat exchanger four-n are various, and the primary water is connected in series, in parallel or in series-parallel; leading-out points of the primary water entering the heat exchanger IV-N can be before the first generator (4), after the first generator (4) or after the second generator (5), the partitioned primary and secondary water is connected in parallel to enter the first condenser (2) and the first heat exchanger (10), the partitioned secondary water is connected in parallel to enter the first absorber (8) and the second heat exchanger (11), and the partitioned tertiary and secondary water is connected in parallel to enter the third heat exchanger (12), the second absorber (9) and the second condenser (3), wherein the secondary water connection mode of the second absorber (9) and the second condenser (3) can also be series connection; and respectively feeding the secondary water in the four-n partitions into the four-n heat exchangers for heat exchange and temperature rise.