WO2009105930A1

WO2009105930A1 - A kind of concentrated heat-supply system

Info

Publication number: WO2009105930A1
Application number: PCT/CN2008/001605
Authority: WO
Inventors: 付林; 江亿; 张世钢; 肖常磊; 李永红; 胡鹏; 狄洪发; 郝永刚
Original assignee: 清华大学; 北京环能瑞通科技发展有限公司
Priority date: 2008-02-28
Filing date: 2008-09-11
Publication date: 2009-09-03
Also published as: CN100507375C; CN101231004A

Abstract

A kind of concentrated heat-supply system includes a steam turbine (1), which has a condenser (2), at least a steam absorption type heat pump (3), a steam-water heat exchanger (4) and pipes (7, 8, 9). The exhausted steam of the steam turbine (1) is used to pre-heat the back-water of the first heat network, and drive the steam absorption type heat pump (3). The hot water of the heat network is heated by the condenser (2), the steam absorption type heat pump (3) and the steam-water heat exchanger (4) for three times. At the end, the heat-supply hot water of the second network is heated by a hot water absorption type heat pump (5) and a water-water heat exchanger (6) in a combination form.

Description

Central heating system

The invention relates to a central heating system.

Background technique

With the continuous development of the city scale, the district heating area is increasing, which brings about two problems: 1) The ability to centrally supply heat sources is insufficient. The new large-scale heat source has high investment, long construction period, and is strongly restricted by environmental capacity. Some places have blindly developed small coal-fired boiler houses, which have brought serious pollution to the atmosphere. Some places have blindly developed gas heating and even electric heating. At the same time, the high cost of heating brings about the overall tension of gas and electricity. 2) High-temperature hot water generated by heat sources often needs to be transported over a long distance to reach the end user. At present, the primary network supply and return water temperature of urban central heating is generally about 120 ° C and 60 ° C. Due to the limitation of the secondary network heat requirements, the return water temperature can no longer be reduced by using conventional heat exchangers. Therefore, the amount of hot water delivered is very large, which makes the heating radius small, the pipeline investment and the power consumption of the pump run more and more prominent.

There is still a large amount of circulating water waste heat resources in the thermal power plant that have not been effectively utilized, and the white waves have been spent. If we can use the circulating water supply of thermal power plants, it is equivalent to expanding the heat supply capacity of the heat source without increasing the capacity of the power plant and increasing the local emissions. However, due to its low thermal energy quality, it has not been effectively utilized.

Invention disclosure

It is an object of the invention to provide a central heating system.

The present invention provides a device for supplying heat to a heating network.

The apparatus for heating a primary network provided by the present invention comprises: a steam turbine including a condenser 2, at least one steam absorption heat pump 3, a steam-water heat exchanger 4, a pipe 7, a pipe 8 and a pipe 9; Passing through the steam turbine 1 and the condenser 2 in sequence;

The pipe 8 is composed of a main pipe and two branch pipes. The main pipe 8 passes through the steam turbine 1 and is divided into two branch pipes. The branch pipe 8-1 passes through the steam absorption heat pump 3, and the branch pipe 8-2 passes through the steam-water heat exchanger. 4;

The pipe 9 is composed of a main pipe and two branch pipes. The main pipe 9 passes through the condenser 2 and is divided into two branch pipes. The branch pipe 9-1 passes through the steam absorption heat pump 3 and the primary network return pipe. The passage 13 communicates, and the branch conduit 9-2 passes through the steam absorption heat pump 3 and the steam-water heat exchanger 4 in sequence. When the steam absorption heat pump 3 is two or more, the branch pipe 8-1 may be further branched to form two or more secondary branch pipes, each of which passes through a steam absorption heat pump 3 respectively. Convergence.

The steam absorption heat pump 3 is two or more, and the branch pipe 8-1 may pass through each of the steam absorption heat pumps 3 in order.

The branch pipe 9-2 can be branched into two secondary branch pipes before passing through the steam absorption heat pump 3, and the secondary branch pipes 9-2-1 pass through the steam absorption heat pump 3 and the steam-water heat exchanger 4 in sequence. The secondary branch pipe 9-2-2 is in communication with the primary heat network return pipe 13.

The apparatus may also include a circulating water cooling device 14. The circulating water cooling device (14) can be accessed by any of the following two methods -

1 is connected in series to the outlet pipe section of the absorption heat pump 3 of the branch pipe 9-1;

2 Connected to the outlet pipe section of the absorption heat pump 3 of the branch pipe 9-1.

The steam-water heat exchanger 4 can also be replaced by other heating equipment, such as a boiler.

It is also within the scope of the present invention to include a heating system for the primary heating network heating device. The heating system may include more than one heat exchange device in addition to the above device; the primary heat network heating device and the heat exchange device pass through a heat network water supply pipe 12 and a heat network backwater The pipe 13 is connected;

The heat exchange device comprises at least one hot water type absorption heat pump 5, at least one water-water heat exchanger 6, a pipe 10 and a pipe 11; the hot water type absorption heat pump 5 comprises: a generator, an evaporation , the condenser, the absorber; the pipe 10 sequentially forms a primary heat network system through the generator of the hot water type absorption heat pump 5, the water-water heat exchanger 6 and the evaporator of the hot water type absorption heat pump 5; The duct 11 forms a secondary heat network system through an absorber of the hot water type absorption heat pump 5, a condenser of the hot water type absorption heat pump 5, and a water-water heat exchanger 6.

When the heating system includes one of the heat exchange devices, the pipe 9 communicates with the primary heat network return pipe 13 before passing through the condenser 2, and the branch pipe 9-2 or the secondary branch pipe 9-2-1 passes through the steam- The water heat exchanger 4 is connected to the primary heat network water supply pipe 12, and the pipe 10 communicates with the primary heat network water supply pipe 12 before passing through the generator of the hot water type absorption heat pump 5.

When the heating system includes two or more heat exchange devices connected in parallel, the pipe 9 communicates with the primary heat network return pipe 13 before passing through the condenser 1, and the branch pipe 9-2 or the secondary branch pipe 9-2 - 1 After passing through the steam-water heat exchanger 4, it is in communication with the primary heat network water supply pipe 12, and the pipes 10 of the respective heat exchange devices are in communication with the primary heat network water supply pipe 12.

In the heat exchange device, the pipe 11 may sequentially pass through an absorber of the hot water type absorption heat pump 5, a condenser of the hot water type absorption heat pump 5, and a water-water heat exchanger 6, as shown in Fig. 1.

In the heat exchange device, the pipe .11 is composed of at least two independent pipes, and an independent pipe passes through the absorber of the hot water type absorption heat pump 5 and the condenser of the hot water type absorption heat pump 5 in turn, other In the pipeline, each pipeline passes through a water-water heat exchanger 6, respectively, as shown in Fig. 2.

The secondary heat network hot water parameters of the absorption heat pump 1 and the secondary heat network hot water parameters of the water-water heat exchanger 2 may be different, and respectively delivered to different heat users through respective secondary network systems.

When the heat exchange device comprises a water-water heat exchanger 6, in the heat exchange device, the pipe 11 is composed of a main pipe and two branch pipes, and the main pipe 11 is first divided into two branch pipes, branches The pipe 11-1 passes through the absorber of the hot water type absorption heat pump 5 and the condenser of the hot water type absorption heat pump 5 in sequence, the branch pipe 11-2 passes through the water-water heat exchanger 6, and then the two branch pipes merge, see image 3.

When the heat exchange device comprises two water-water heat exchangers 2, in the heat exchange device, the pipe 11 is composed of a main pipe and three branch pipes, and the main pipe 11 is first divided into three branch pipes, branches. The pipe 11-1 passes through the absorber of the hot water type absorption heat pump 1 and the condenser of the hot water type absorption heat pump 1, and the branch pipe 11-2 passes through a water-water heat exchanger, and the branch pipe 11-3 passes another A water-water heat exchanger, then three branch pipes merge.

When the heat exchange device comprises two water-water heat exchangers 2, in the heat exchange device, the pipe 11 is composed of a main pipe and two branch pipes, and the main pipe 11 is first divided into two branch pipes, branches The pipe 11-1 passes through the absorber of the hot water type absorption heat pump 1 and the condenser of the hot water type absorption heat pump 1, and the branch pipe 11-2 passes through a water-water heat exchanger, and then the two branch pipes are combined. After passing another water-water heat exchanger.

When the heat exchange device comprises two water-water heat exchangers 2, in the heat exchange device, the pipe 11 is composed of a main pipe and two branch pipes, and the main pipe 11 is sequentially passed through a hot water type absorption type. The absorber of the heat pump 1 and the condenser of the hot water type absorption heat pump 1 are then divided into two branch pipes, the branch pipe 11-1 passes through one water-water heat exchanger, and the branch pipe 11-2 passes through another water- The water heat exchanger, then the two branch pipes meet. The hot water type absorption heat pump 1 satisfies the following conditions: After the hot water of the primary heat network passes through the generator of the hot water absorption heat pump 1, the temperature is lowered by 10 to 40 Torr, and the hot water flows out from the water-water heat exchanger 2 After passing through the evaporator of the hot water type absorption heat pump 1, the temperature is lowered by 20 to 40 Ό; after the secondary heat network is returned to the water through the absorber and condenser of the hot water type absorption heat pump 1, the temperature rises by 10 to 30". C o

Usually, the temperature of the hot water in the primary water supply pipe is 80 to 130 °C.

Both the primary heat network heating device and the heating system can be applied to central heating.

The steam absorption heat pump can adopt a multi-stage heat pump device in series with each other, and the multi-stage serial steam absorption heat pump device can be selected from the same model, or different models can be selected according to operating parameters.

The steam turbine is a steam turbine in a power plant of a power plant; a valve can be installed on the large heat network return pipe 13 and the branch pipe 9-2; and the second branch pipe 9-2-2 can be equipped with an adjustment The valve adjusts the amount of bypass water and controls the temperature of the circulating water at the inlet of the condenser, so that the power generation production of the power plant is not affected by the changes of the parameters of the large heat network.

When the heating system includes a device for supplying heat to the primary heating network and two parallel heat exchange devices, the system schematic is shown in Fig. 4. Turbine 1 The final stage exhaust enters the condenser 2 to heat the circulating water, which is cooled and condensed before returning to the boiler for heating. The steam extracted by the steam turbine 1 is divided into two paths, one into the steam absorption heat pump 3, which is used as a driving heat source to recover the residual heat of the circulating water and heat the primary heating network, and the other enters the steam-water heat exchanger 4, directly heating the primary heating network, steam The condensate returns to the boiler for heating. The circulating cooling water enters the condenser 2, is heated by the steam exhaust of the steam turbine 1 and is sent out, enters the steam absorption heat pump 3, and serves as a low-level heat source, and then returns to the condenser after the heat is cooled down to complete the cycle, if the exhaust heat of the steam turbine 1 is greater than If necessary, a part of the circulating cooling water can be separated into the circulating water cooling device 14 to release the heat. The primary heat network returns to the power plant at a low temperature, first enters the condenser 2, is sent to the condenser after being warmed up, and is sent to the steam absorption heat pump 3 to be sent after secondary heating, and then enters the steam-water heat exchanger 4 and is heated three times. After being heated to the temperature of the hot water supply, the power is sent to the power plant. The hot water supply of the hot network is sent to the end heat station. First, it enters the hot water absorption heat pump 5 as the driving heat source. After the heat is cooled, it enters the water-water heat exchanger 6 and heats twice. The hot network supplies hot water. After cooling, it enters the hot water absorption heat pump 5 again as a low-level heat source. After the heat is cooled down to the heat return temperature of the hot network, it returns to the power plant to complete the cycle.

The heating system of the present invention uses a condenser 2, a steam absorption heat pump 3 inside the power plant and The steam-water heat exchanger 4 combines to recover the waste heat of the power plant and heats the hot water of the heat network one by one, and gradually reduces the temperature by the combination of the hot water absorption heat pump 5 and the water-water heat exchanger 6 at the end. The heating hot water temperature of the heating network increases the temperature difference between the supply and return water of the hot water.

DRAWINGS

1 is a schematic flow chart of a first connection mode of a heat exchange device of the present invention.

2 is a schematic flow chart of a second connection mode of the heat exchange device of the present invention.

3 is a schematic flow chart of a third connection mode of the heat exchange device of the present invention.

Figure 4 is a schematic view of Embodiment 1.

Figure 5 is a schematic view of Embodiment 2.

Fig. 6 is a schematic view of a hot water type absorption heat pump applied in the embodiment.

The best way to implement the invention

Specific embodiments of the present invention will be described below in conjunction with specific embodiments.

The hot water type absorption heat pump 5 used in the following embodiments is shown in Fig. 6, and is composed of a generator 5-1, a condenser 5-2, an absorber 5-3, an evaporator 5-4, and a solution heat exchanger 5- 5. Throttle device 5 - 6, solution pump 5-7, refrigerant pump 5-8 and various connecting pipes.

When the hot water type absorption heat pump is working, a dilute solution (such as a lithium bromide aqueous solution) is heated and boiled by the high temperature hot water in the generator to generate a refrigerant vapor and a concentrated solution;

The concentrated solution enters the absorber after being cooled by the solution heat exchanger, and the concentrated solution absorbs the refrigerant vapor to become a dilute solution, and then is heated by the solution heat exchanger and then enters the generator by the solution pump to complete the solution circulation;

The refrigerant vapor enters the condenser, releases the condensation heat, and condenses into a refrigerant liquid; the refrigerant liquid enters the evaporator through the throttling device to absorb heat and evaporates, and the generated vapor enters the absorber and is absorbed by the solution, completing the refrigerant circulation. .

Embodiment 1. Application of Central Heating System

First, assembly

Turbine with condenser 2 assembly 1 : C145/n200- 130/535, Dongfang Steam Turbine Co., Ltd.

Steam absorption heat pump 3 : Model DHP1750, purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

Steam-water heat exchanger 4: purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd. Large temperature difference heat exchange unit including hot water type absorption heat pump 5 and water-water heat exchanger 6: Model AHE8000A, purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

The connection diagram is shown in Figure 4.

The device for heating the primary heating network: the pipeline 7 passes through the steam turbine 1 and the condenser 2 in sequence; the pipeline 8 is composed of the main road and two branch pipes, and the main road 8 passes through the steam turbine 1 and is divided into two branch pipes, and the branch pipe 8 -1 through the steam absorption heat pump 3, the branch pipe 8-2 passes through the steam-water heat exchanger 4; the pipe 9 is composed of the main pipe and its three branch pipes, and the main road 9 passes through the condenser 2 and is divided into three branch pipes The branch pipe 9-1 is connected to the primary heat network return pipe 13 through the steam absorption heat pump 3, and the branch pipe 9-2 can be branched into two secondary branch pipes before passing through the steam absorption heat pump 3, and the secondary branch The pipe 9-2-1 passes through the steam absorption heat pump 3 and the steam-water heat exchanger 4 in sequence, the secondary branch pipe 9-2-2 communicates with the primary heat network return pipe 13, and the branch pipe 9-3 is cooled by circulating water. The device 14 is then in communication with a primary heat network return conduit 13.

Heat exchange device: The pipe 10 passes through the generator of the hot water type absorption heat pump 5, the water-water heat exchanger 6 and the evaporator of the hot water type absorption heat pump 5 in sequence; the pipe 11 passes through the hot water type absorption heat pump 5 in sequence. An absorber, a condenser of the hot water type absorption heat pump 5, and a water-water heat exchanger 6.

Heating system: the pipeline 9 is communicated with the primary heat network return pipe 13 before passing through the condenser 2, and the secondary branch pipe 9-2-1 is passed through the steam-water heat exchanger 4 and communicated with the primary heat network water supply pipe 12 The plurality of heat exchange devices are connected in parallel, and the respective water inlet pipes of the heat exchange device are connected to the primary heat network water supply pipe 12, and the water outlet pipe is connected with the primary heat network return water pipe 13.

Second, the application

The last stage exhaust steam of the steam turbine 1 enters the condenser to heat the circulating water, and is cooled and condensed before returning to the boiler for heating. The steam extracted by the steam turbine 1 is divided into two paths, one into the steam absorption heat pump 3, which is used as a driving heat source to recover the residual heat of the circulating water and heat the primary heating network, and the other enters the steam-water heat exchanger 4, directly heating the primary heating network, steam The condensate returns to the boiler for heating. The circulating cooling water enters the condenser 2, is heated by the steam exhaust of the steam turbine 1 and is sent out, enters the steam absorption heat pump 3, and acts as a low-level heat source, and then returns to the condenser after the heat is cooled down to complete the cycle, such as the exhaust heat of the steam turbine 1 Then, it is discharged to the environment through the circulating water cooling device 14. The primary heat network returns to the power plant at a low temperature, first enters the condenser 2, is warmed up and sent out, and is sent to the steam absorption heat pump 3 to be sent after secondary heating, and then enters the steam-water heat exchanger 3 and is heated three times. After being heated to the temperature of the hot water supply, the power is sent to the power plant, and the hot water supply of the hot network is sent to the end heat station, first entering the hot water as the driving heat source. The absorption heat pump 5, after the heat release and cooling, enters the water-water heat exchanger 6 to heat the secondary heat network to supply hot water, and then enters the hot water absorption heat pump 5 as a low-level heat source after cooling, and finally releases the heat to a heat network back. Return to the power plant after the water temperature, complete the cycle.

It can be seen that the invention adopts a combined heating mode of a condenser, a steam absorption heat pump and a steam-water heat exchanger in a power plant, and adopts a combination of a hot water absorption heat pump and a water-water heat exchanger at the end. On the one hand, the waste heat generated in the power generation process of the power plant is effectively recovered. On the other hand, the temperature difference between the supply and return water of the primary heat network is greatly increased compared with the conventional centralized heating mode.

Example 2, Application of Central Heating System

First, assembly

Steam absorption heat pump 3a: Model SHP1300, purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

Steam absorption heat pump 3b: Model DHP1750, purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

Steam absorption heat pump 3c: Model LTHP1260, purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

Steam-water heat exchanger 4: Purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

• Large temperature difference heat exchanger unit including hot water type absorption heat pump 5 and water-water heat exchanger 6: Model AHE8000A, purchased from Beijing Huaneng Ruitong Technology Development Co., Ltd.

The connection diagram is shown in Figure 5. Three-stage steam absorption heat pump 3 is used for series heating.

The device for supplying heat to the heat network: the pipe 7 passes through the steam turbine 1 and the condenser 2 in sequence; the pipe 8 is composed of the main pipe and its two branch pipes, and the main pipe passes through the steam turbine 1 and is divided into two branch pipes, and the branch pipe 8- 1 further branching, forming three secondary branch pipes, respectively passing through the steam absorption heat pump 3a, the steam absorption heat pump 3b, the steam absorption heat pump 3c, and the branch pipe 8-2 passing through the steam-water heat exchanger 4; The main pipe 9 is divided into three branch pipes through the condenser 2, and the branch pipe 9-1 is divided into three branches respectively through the steam absorption heat pump 3a, the steam absorption heat pump 3b, and the steam. After the absorption heat pump 3c is merged, it is connected to the primary heat network return pipe 13, and the branch pipe 9-2 can be branched into two secondary branch pipes before passing through the steam absorption heat pump 3, and the secondary branch pipes 9-2-1 pass sequentially. Steam absorption heat pump 3a, The steam absorption heat pump 3b, the steam absorption heat pump 3c and the steam-water heat exchanger 4, the secondary branch pipe 9-2-2 communicate with the primary heat network return pipe 13, and the branch pipe 9-3 passes the circulating water cooling device 14. It communicates with the primary heat network return pipe 13.

Heat exchange device: The pipe 10 passes through the generator of the hot water type absorption heat pump 5, the water-water heat exchanger 6 and the evaporator of the hot water type absorption heat pump 5 in sequence; the pipe 11 passes through the hot water type absorption heat pump 5 in sequence. The absorber, the condenser of the hot water type absorption heat pump 5, and the water-water heat exchanger 6, and then the two branch pipes merge.

Heating system: The pipeline 9 communicates with the primary heat network return pipe 13 before passing through the condenser 2, and the secondary branch pipe 9-2-1 passes through the steam-water heat exchanger 4 and communicates with the primary heat network water supply pipe 12, The heat exchange devices are connected in parallel, and the respective water inlet pipes of the heat exchange device are connected to the primary heat network water supply pipe 12, and the water outlet pipe is connected to the primary heat network return water pipe 13.

Second, the application

The steam exhaust of the first stage of the steam turbine enters the condenser to heat the circulating water, which is cooled and condensed before returning to the boiler for heating. The steam extracted by the steam turbine 1 is divided into two paths, one into a first-stage steam absorption heat pump 3a, a second-stage steam absorption heat pump 3b, and a third-stage steam absorption heat pump 3c, which are used as a driving heat source to recover the residual heat of the circulating water and are heated step by step. One heat network, the other enters the steam-water heat exchanger 4, directly heats the heat network once, and the steam condensate returns to the boiler for heating. The circulating cooling water enters the condenser 2, is heated by the steam exhaust of the steam turbine 1, and is sent out to enter the first-stage steam absorption heat pump 3a, the second-stage steam absorption heat pump 3b, and the third-stage steam absorption heat pump 3c as low-level heat sources. After the heat is cooled, it is returned to the condenser to complete the cycle, and excess heat is discharged to the environment through the circulating water cooling device 14. The primary heating network returns to the power plant at a low temperature, first enters the condenser 2, is warmed up and sent out, and passes through the first-stage steam absorption heat pump 3a, the secondary steam absorption heat pump 3b and the third-stage steam absorption heat pump 3c. After heating step by step, it is sent out, and then enters the steam-water heat exchanger 4 and is heated three times. After being heated to the temperature of the hot water supply, it is sent to the power plant. The high-temperature water supply of the hot network is sent to the end heat station, and firstly enters the hot water as the driving heat source. The absorption heat pump 5, after the heat release and cooling, enters the water-water heat exchanger 6 to heat the secondary side heating hot water, and then enters the hot water absorption heat pump 5 as a low-level heat source after cooling, and finally releases the heat to a heat network backwater. Return to the power plant after the temperature and complete the cycle.

Industrial application

The features of the invention are mainly embodied in three aspects: 1) preheating the primary heat network backwater by using the steam exhaust of the steam turbine, and using the circulating cooling water as the low heat source of the absorption heat pump, the advantage is effective recovery The waste heat generated during the power generation process of the power plant; 2) The condenser network, the steam absorption heat pump and the steam-water heat exchanger are used to heat the hot water of the hot network three times, which has the advantages of increasing the temperature of the hot water supply and increasing the heat once. The return of the net and the temperature difference of the water supply; 3) heating the secondary network for hot water supply by means of a combination of a hot water absorption heat pump and a water-water heat exchanger at the end, which has the advantage of sufficiently reducing the return water temperature of the primary heat network, increasing The temperature difference between the supply and return water of the hot network was increased.

Claims

Rights request

1. A device for supplying heat to a net, comprising: a steam turbine (1) containing a condenser (2), at least one steam absorption heat pump (3), a steam-water heat exchanger (4), a pipe (7) , pipe (8) and pipe (9);

The pipe (7) passes through the steam turbine (1) and the condenser (2) in sequence;

The pipe (8) is composed of a main pipe and two branch pipes, and the main pipe (8) is divided into two branch pipes through a steam turbine (1), and the branch pipe (8-1) passes through a steam absorption heat pump (3), a branch pipe (8-2) through a steam-water heat exchanger (4);

The pipe (9) consists of a main pipe and two branch pipes. The main pipe (9) is divided into two branch pipes by a condenser (2), and the branch pipe (9-1) passes through a steam absorption heat pump (3). It is connected to the primary network return pipe (13), which in turn passes through the steam absorption heat pump (3) and the steam-water heat exchanger (4).

2. The apparatus according to claim 1, wherein: the steam absorption heat pump (3) is two or more, and the branch pipe (8-1) further branches to form two or more secondary branch pipes. Each of the secondary branch pipes is passed through a vapor absorption heat pump (3) and then merged.

3. The device according to claim 1, characterized in that: the branch pipe (9-2) branches into two secondary branch pipes and a secondary branch pipe (9- before passing through the steam absorption heat pump (3). 2-1) Pass the steam absorption heat pump (3) and the steam-water heat exchanger (4) in turn, and the secondary branch pipe (9-2-2) communicates with the primary heat network return pipe (13).

4. A heating system comprising a primary heating device as claimed in any one of claims 1 to 3.

5. The heating system according to claim 4, wherein: the system further comprises one or more heat exchange devices; and the primary network heating device and the heat exchange device pass through a heat network water supply pipe (12) connected to the primary heat network return pipe (13);

The heat exchange device comprises a hot water type absorption heat pump (5), at least one water-water heat exchanger (6), a pipe (10) and a pipe (11); the hot water type absorption heat pump (5) ) includes: a generator, an evaporator, a condenser, an absorber; the pipe (10) sequentially passes through a generator of a hot water type absorption heat pump (5), a water-water heat exchanger (6), and a hot water type absorption The evaporator of the heat pump (5) forms a primary network system; the pipe (11) is absorbed by the hot water type absorption heat pump (5) The condenser of the hot water type absorption heat pump (5) and the water-water heat exchanger (6) form a secondary network system.

6. The heating system according to claim 5, wherein: said heating system comprises a heat exchange device, and said pipe (9) passes through a condenser (2) and a heat network return pipe ( 13) The same, branch pipe (9-2) or secondary branch pipe (9-2-1) passes through the steam absorption heat pump (3) and the steam-water heat exchanger (4) and the primary heat network water supply pipe (12 In the same way, the pipe (10) is connected to the primary heat network water supply pipe (12) through the generator of the hot water type absorption heat pump (5).

7. The heating system according to claim 5, wherein: said heating system comprises two or more said heat exchange devices in parallel, and the pipe (9) passes through the condenser (2) before and once. The return water pipe (13) is connected, the branch pipe (9-2) or the secondary branch pipe (9-2-1) passes through the steam absorption heat pump (3) and the steam-water heat exchanger (4) and the primary heat network The water supply pipe (12) communicates; the pipe (10) of each heat exchange device communicates with the primary heat network water supply pipe (12) through the generator of the hot water type absorption heat pump (5).

The heating system according to any one of claims 5 to 7, characterized in that: the pipe (11) passes through the absorber of the hot water type absorption heat pump (5) in turn, and the hot water type absorption heat pump

(5) Condenser and water-water heat exchanger (6).

9. The heating system according to any one of claims 5 to 7, characterized in that: the pipe (11) consists of at least two independent pipes, and an independent pipe passes through a hot water type absorption heat pump in turn ( 5) The absorber and the condenser of the hot water absorption heat pump (5). In other pipes, each pipe passes through a water-water heat exchanger (6).

10. The heating system according to any one of claims 5 to 7, wherein: said heat exchange device comprises a water-water heat exchanger (6), said pipe (11) being composed of a main pipe and It consists of two branch pipes. The main pipe (11) is first divided into two branch pipes. The branch pipe (11-1) passes through the absorber of the hot water type absorption heat pump (5) and the hot water type absorption heat pump (5). The condenser, branch pipe (11-2) passes through the water-water heat exchanger (6), and then the two branch pipes meet.

11. The heating system according to any one of claims 5 to 7, wherein: said heat exchange device comprises two water-water heat exchangers (2), said pipes (11) being composed of main pipes and It consists of three branch pipes. The main pipe (11) is first divided into three branch pipes. The branch pipe (11-1) passes through the absorber of the hot water type absorption heat pump (1) and the hot water type absorption heat pump (1). Condenser, branch pipe (11-2) through water-water heat exchanger (2a), branch pipe (11-3) through water-water The heat exchanger (2b), then the three branch pipes meet.

12. The heating system according to any one of claims 5 to 7, wherein: said heat exchange device comprises two water-water heat exchangers (2), and the pipes (11) are composed of a main pipe and two The branch pipe is composed, and the main pipe (11) is first divided into two branch pipes, and the branch pipe (11-1) is sequentially passed through the absorption of the hot water type absorption heat pump (1) and the condensation of the hot water type absorption heat pump (1). The branch pipe (11-2) passes through the water-water heat exchanger (2a), and then the two branch pipes are combined and passed through the water-water heat exchanger (2b).

The heating system according to any one of claims 5 to 7, wherein: said heat exchange device comprises two water-water heat exchangers (2), and the pipes (11) are composed of a main pipe and two The branch pipe is composed of a main pipe (11) which is first passed through the absorber of the hot water type absorption heat pump (1) and the condenser of the hot water type absorption heat pump (1), and then divided into two branch pipes, branch pipes (11) -1) Through the water-water heat exchanger (2a), the branch pipe (11-2) passes through the water-water heat exchanger (2b), and then the two branch pipes merge.

14. The use of a primary mesh heating device according to any one of claims 1 to 3 for central heating.

15. Use of a heating system according to any of claims 4 to 13 for central heating.