CN101799207B - System and method for recycling waste heat of bath sewage by utilizing absorption heat pump - Google Patents

Abstract

A system and method for recovering waste heat from bathing sewage by using an absorption heat pump, including a heat storage tank, a sewage tank, a tap water pipe, and an absorption heat pump unit. After heat exchange, it enters the hot water storage tank; the other way enters the tap water preheater to exchange heat directly with the sewage, and the effluent goes through the absorber and condenser to absorb heat and heat up, and then enters the hot water storage tank as hot water for bathing; The sewage tank collects bathing wastewater and purifies it. The purified sewage is filtered through a filter, and then pressurized by a sewage pump and then enters the tap water preheater. The invention does not need additional boilers as heat sources, and the tap water and bathing sewage can directly exchange heat, thereby improving the heat exchange efficiency.

Description

A system and method for recovering waste heat from bathing sewage by using an absorption heat pump

technical field

The invention belongs to the technical field of energy, and relates to a system for recovering heat in sewage, in particular to a system for recovering waste heat from bathing sewage by using an absorption heat pump, and also relates to a method for recovering waste heat in bathing sewage by using the system.

Background technique

At present, most public baths such as schools, military camps, swimming pools and bathing centers rely on regularly operated coal-fired boilers to provide hot water. In addition, there are also oil-fired (gas) boilers or electric boilers. However, coal-fired boilers have low efficiency and serious environmental pollution. Oil (gas) boilers are greatly affected by fuel supply and price fluctuations, and the cost is high. Electric boilers that use high-grade electric energy to produce hot water are a kind of energy quality. waste.

The above-mentioned public baths use relatively concentrated heat and discharge heat, and the waste heat of the bathing sewage discharged is relatively large. If the waste heat in the bathing sewage can be recovered and heat recycling can be realized, it will have a great impact on both energy saving and environmental protection. meaning.

At present, using the heat pump principle, the discharged bathing sewage is used as a low-temperature cold source, and the heat is extracted to heat the tap water to realize the recovery of heat in the bathing sewage. Such as the patent "energy storage type heat pump hot water boiler water supply device" (patent number ZL01244858.3, publication number CN2502177, publication date 2002.07.24), the patent "a public bath waste heat recovery heat pump bathing machine" (patent number ZL200610112860. X, Publication No. CN1916510, Publication Date 2007.02.21) and the patent "A Low-Grade Waste Heat Recovery Heat Pump Hot Water Device" (Patent No. ZL200720003768.X, Publication No. The working principle and method of bathroom wastewater heat. Although these methods can effectively recover part of the heat in bathroom wastewater, the driving force of the heat pump is high-grade electric energy. Long-term use will cause waste of energy quality and is not economical. ; Patent Application "A Waste Heat Recovery Type Bathroom Hot Water Boiler Device" (Application No. 200910131279.6, Publication No. CN101520208, Publication Date 2009.09.02) discloses a device that uses a boiler as a heat source to drive an absorption heat pump to recover waste heat, but the The device has the following problems: 1) The driving force of the absorption heat pump comes from the hot water or steam generated by the boiler, and the system requires an additional boiler as a heat source; 2) The tap water does not directly exchange heat with the bathing sewage, but with the intermediate water ring The heat exchange with hot water reduces the heat exchange temperature difference, the heat exchange efficiency is low, and the tap water outlet temperature is lower than the direct heat exchange temperature with the sewage, resulting in an increase in the capacity of the absorption machine when recovering the same amount of heat.

Contents of the invention

In order to overcome the above-mentioned problems in the prior art, the object of the present invention is to provide a system that utilizes an absorption heat pump to recover waste heat from bathing sewage, without additional boilers as heat sources, and the tap water and bathing sewage can directly exchange heat, improving the heat exchange efficiency. efficiency.

Another object of the present invention is to provide a method for recovering waste heat from bathing sewage using the above system.

The technical solution adopted by the system of the present invention is:

A system for recovering waste heat from bathing sewage by using an absorption heat pump, comprising a hot water storage tank 1, a sewage pool 2, running water pipes and an absorption heat pump unit 7, the absorption heat pump unit 7 being a direct-fired heat pump unit; A feed water pump 8 is arranged on the top, and the water outlet of the feed water pump 8 is connected with the low temperature side water inlet of the tap water preheater 5, and the low temperature side water outlet of the tap water preheater 5 is connected with the absorber 7b of the absorption heat pump unit 7 The water inlet is connected, the water outlet of the absorber 7b is connected with the water inlet of the condenser 7c, and the water outlet of the condenser 7c is connected with the heat storage tank 1; The water inlet of the flue gas heat exchanger 14 of 7 is connected, and the water outlet of the flue gas heat exchanger 14 is directly connected with the water storage tank 1 or connected to the generator 7a of the absorption heat pump unit 7 and then connected with the water storage tank 1 The tank 1 is connected; the water outlet of the sewage pool 2 is connected with the water inlet of the filter 3, the water outlet of the filter 3 is connected with the water inlet of the high temperature side of the tap water preheater 5, and the water outlet of the high temperature side of the tap water preheater 5 After exchanging heat with the evaporator 7d, it is connected with the sewage outlet.

The tap water pipe at the front end of the feed pump 8 is provided with a ninth valve 18, and the ninth valve 18 is provided with a controller for controlling the flow of tap water according to the change of the liquid level of the heat storage tank 1.

A sewage heat exchanger 6 is disposed between the high temperature side water outlet of the tap water preheater 5 and the evaporator 7d, and the low temperature side of the sewage heat exchanger 6 and the evaporation side of the evaporator 7d form a circulation loop.

A heat pipe 13 is disposed between the high temperature side water outlet of the tap water preheater 5 and the evaporator 7d, and one end of the heat pipe 13 is arranged in the evaporator 7d, and the other end is connected with the high temperature side water outlet of the tap water preheater 5. configuration.

The water outlet at the high temperature side of the tap water preheater 5 is directly connected to the cooling inlet of the evaporator 7d, and the cooling outlet of the evaporator 7d is connected to the sewage outlet.

A bypass pipeline is arranged between the hot water storage tank 1 and the water inlet of the feed water pump 8, and a check valve 11 is arranged on the pipeline.

Another technical solution adopted by the system of the present invention is:

A system for recovering waste heat from bathing sewage by using an absorption heat pump, comprising a hot water storage tank 1, a sewage pool 2, running water pipes and an absorption heat pump unit 7, the absorption heat pump unit 7 being a steam or hot water driven heat pump unit ; The tap water pipe is equipped with a feed water pump 8, one of the water outlets of the feed water pump 8 is connected with the low temperature side water inlet of the tap water preheater 5, and the low temperature side water outlet of the tap water preheater 5 is absorbed by the absorption heat pump unit 7 The water inlet of the absorber 7b is connected, the water outlet of the absorber 7b is connected with the water inlet of the condenser 7c, and the water outlet of the condenser 7c is connected with the heat storage tank 1; the other way of the water outlet of the feed pump 8 is connected with the absorption The low-temperature side water inlet of the heat exchanger 17 of the heat pump unit 7 is connected, and the low-temperature side water outlet of the heat exchanger 17 is directly connected with the hot water storage tank 1; the water inlet and outlet of the high-temperature side of the heat exchanger 17 are respectively connected with The steam or hot water outlet and inlet of the generator 7a of the absorption heat pump unit 7 are connected; the water outlet of the sewage tank 2 is connected with the water inlet of the filter 3, and the water outlet of the filter 3 is connected with the high temperature The side water inlets are connected, and the high-temperature side outlet water of the tap water preheater 5 communicates with the sewage outlet after exchanging heat with the evaporator 7d.

The technical scheme adopted in the method of the present invention is:

A method for recovering waste heat from bathing sewage by using an absorption heat pump. The system for realizing the method includes a heat storage tank 1, a sewage pool 2, tap water pipes, and an absorption heat pump unit 7. The tap water is pressurized by a feed pump 8 and divided into two paths One way enters the absorption heat pump unit 7 for heat exchange, and then directly enters the heat storage tank 1 or enters the generator 7a of the absorption heat pump unit 7 to absorb heat and heat up and then enters the heat storage tank 1; the other way enters the tap water preheater 5 direct heat exchange with the sewage, and the effluent passes through the absorber 7b and the condenser 7c of the absorption heat pump unit 7 to absorb heat and heat up, and then enters the heat storage tank 1 as hot water for bathing; the sewage pool 2 is used to collect and purify the bathing wastewater. The purified sewage is filtered by the filter 3, then pressurized by the sewage pump 4, and then enters the tap water preheater 5, first exchanges heat with the tap water, and the effluent is discharged after exchanging heat with the refrigerant of the evaporator 7d.

The absorption heat pump unit 7 is a direct-fired absorption heat pump unit or a steam or hot water driven absorption heat pump unit.

The refrigerant in the evaporator 7d and the sewage are used for indirect heat exchange through the sewage heat exchanger 6, or heat pipes 13 are used for heat exchange, or the sewage directly enters the evaporator 7d to directly exchange the refrigerant with the evaporator 7d. hot.

Compared with prior art, the present invention has following characteristics:

1. The absorption heat pump unit is adopted, and there is no need to set up an additional boiler as a driving heat source;

2. It flexibly realizes the switching between direct heating of tap water and waste heat recovery, ensuring the provision of hot water for bathing at the initial stage of bathing;

3. Tap water directly exchanges heat with sewage, which reduces the heat exchange temperature difference loss in the intermediate link, that is, under the same heat exchanger area, more heat is exchanged, which effectively reduces the capacity of the heat pump unit and improves heat exchange efficiency;

4. Adding a bypass line at the inlet of the feedwater pump 8 and the water storage tank 1 can effectively ensure that the flow rate entering the absorption heat pump unit through the feedwater pump 8 is stable, and ensure the stable operation of the unit; When it is lower, the hot water circulation reheating is realized.

5. The amount of tap water entering the feed water pump 8 can be controlled by the liquid level of the heat storage tank 1;

Sixth, the recovery of flue gas condensation heat has been realized.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the indirect heat exchange system of the direct-fired absorption heat pump unit of the present invention.

Fig. 2 is a structural principle diagram of the heat pipe heat exchange system of the direct-fired absorption heat pump unit of the present invention.

Fig. 3 is a structural principle diagram of the direct heat exchange system of the direct-fired absorption heat pump unit of the present invention.

Fig. 4 is a structural principle diagram of the indirect heat exchange system of the steam or hot water driven absorption heat pump unit of the present invention.

Fig. 5 is a structural principle diagram of the steam or hot water driven absorption heat pump unit heat pipe heat exchange system of the present invention.

Fig. 6 is a structural principle diagram of the direct heat exchange system of the steam or hot water driven absorption heat pump unit of the present invention.

In the figure, 1-hot water storage tank; 2-sewage pool; 3-filter; 4-sewage pump; 5-tap water preheater; 6-sewage heat exchanger; 7-absorption heat pump unit; 7a-generator ;7b-absorber; 7c-condenser; 7d-evaporator; 7e-burner; 8-feed water pump; 9a-first valve; 9b-second valve; 10a-third valve; 10b-fourth valve; 10c-fifth valve; 11-return valve; 12-solution heat exchanger; 13-heat pipe; 14-flue gas heat exchanger; 15a-sixth valve; 15b-seventh valve; 16-eighth valve; 17 - heat exchanger; 18 - ninth valve; 19 - tenth valve; 20 - eleventh valve.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the direct-fired absorption heat pump unit indirect heat exchange type system of the present invention includes a hot water storage tank 1, a sewage tank 2, tap water pipes and an absorption heat pump unit 7, and the said absorption heat pump unit 7 It is a direct-fired heat pump unit; the tap water pipe is equipped with a feed water pump 8, and one of the outlets of the feed water pump 8 is connected with the water inlet of the low-temperature side of the tap water preheater 5, and the outlet of the feed water pump 8 is connected with the tap water preheater 5 A second valve 9b is arranged between the low-temperature side water inlets of the tap water preheater 5, and the low-temperature side water outlet of the tap water preheater 5 is connected with the water inlet of the absorber 7b of the absorption heat pump unit 7, and the water outlet of the absorber 7b is connected with the condenser 7c The water inlet of the condenser 7c is connected with the water storage tank 1; the other way of the water outlet of the feed water pump 8 is connected with the water inlet of the flue gas heat exchanger 14 of the absorption heat pump unit 7, and the water supply A first valve 9a is provided between the water outlet of the water pump 8 and the water inlet of the flue gas heat exchanger 14, and the water outlet of the flue gas heat exchanger 14 is directly connected to the heat storage tank 1 or connected to the absorption heat pump unit 7 The generator 7a is connected with the heat storage tank 1; the water outlet of the sewage tank 2 is connected with the water inlet of the filter 3, and the water outlet of the filter 3 is connected with the high temperature side water inlet of the tap water preheater 5 , the water outlet at the high temperature side of the tap water preheater 5 communicates with the sewage outlet after exchanging heat with the evaporator 7d.

The tap water pipe at the front end of the feed pump 8 is provided with a ninth valve 18, and the ninth valve 18 is provided with a controller for controlling the flow of tap water according to the change of the liquid level of the heat storage tank 1.

A sewage heat exchanger 6 is disposed between the high temperature side water outlet of the tap water preheater 5 and the evaporator 7d, and the low temperature side of the sewage heat exchanger 6 and the evaporation side of the evaporator 7d form a circulation loop.

A bypass pipeline is arranged between the hot water storage tank 1 and the water inlet of the feed water pump 8, and a check valve 11 is arranged on the pipeline.

The working principle of this embodiment is: after the tap water is pressurized by the feed water pump 8, it is divided into two paths, and one path enters the flue gas heat exchanger 14 to exchange heat with the flue gas, and is controlled by the tenth valve 19 to enter the generation of the absorption heat pump unit 7. The water heater 7a absorbs heat and heats up and enters the hot water storage tank 1 or directly enters the hot water storage tank 1; the other way enters the tap water preheater 5 to directly exchange heat with the sewage, and the effluent passes through the absorber 7b of the absorption heat pump unit 7 respectively And the condenser 7c absorbs heat and heats up and enters the heat storage tank 1 as hot water for bathing. Said cesspool 2 collects bath waste water and purifies it. The purified sewage is filtered by filter 3, then pressurized by sewage pump 4 and enters tap water preheater 5. Exchange heat with the circulating water in the evaporator 7d and discharge it; the low temperature side of the sewage heat exchanger 6 and the evaporation side of the absorption heat pump unit 7 form a circulation loop, and a circulation pump is provided on the circulation loop; The heat pump unit 7 is a direct-fired absorption heat pump unit, and the fuel combustion in the burner 7e inside the source of the driving force required by it, so that there is no need to set an additional heat source as a driving force. The third valve 10a and the fourth valve 10b are set on the solution circulation line of the solution, and the fifth valve 10c is set on the steam line between the generator 7a and the condenser 7c; A bypass pipeline, and a check valve 11 is set on the pipeline to ensure that the flow entering the heat pump unit through the feed water pump 8 is stable; a ninth valve 18 for controlling flow is added before the connection point between the feed water pump 8 and the bypass pipe, so that The valve opening is controlled by the liquid level of the hot water storage tank 1; a bypass pipe is provided on the tap water pipeline side of the tap water preheater 5, and an eleventh valve 20 is arranged thereon.

When bathing begins, because the sewage tank does not have sewage, waste heat recovery cannot be carried out, and the absorption heat pump unit 7 enters the state of directly heating tap water. At this time, the third valve 10a, the fourth valve 10b of the solution loop and the fifth valve 10c of the steam loop are all closed, the first valve 9a of the tap water pipeline is opened, the second valve 9b is closed, and the second valve 19 allows the generator to be bypassed. The pipeline is closed, and the pipeline entering the generator 7a is opened, so that tap water can enter the generator 7a; the heat pump is turned on, but at this time, because the solution does not circulate, the tap water first exchanges heat with the flue gas in the flue gas heat exchanger 14, Then enter the generator 7a and be heated to the required hot water temperature and then enter the hot water storage tank 1. When the sewage is collected to a certain extent, the absorption heat pump unit 7 switches to the waste heat recovery state. At this time, the third valve 10a, the fourth valve 10b of the solution loop and the fifth valve 10c of the steam loop are all opened, the second valve 9b on the tap water pipeline is opened, the first valve 9a automatically adjusts the flow rate, and the tenth valve 19 switches Until the bypass pipeline is opened, the pipeline entering the generator 7a is closed, and the tap water is heated by the flue gas heat exchanger 14 and directly enters the hot water storage tank 1; the other tap water passes through the tap water preheater 5 and directly exchanges heat with sewage , and then enter the absorber 7b and condenser 7c in turn to heat up to the required hot water temperature and then enter the hot water storage tank 1 to realize waste heat recovery. The amount of tap water entering the feed water pump 8 can be controlled by the liquid level of the hot water storage tank 1. The eleventh valve 20 on the tap water bypass pipe of the tap water preheater 5 then controls on-off according to the tap water temperature before entering the tap water preheater 5 .

As shown in Figure 2, the heat pipe heat exchange system of the direct-fired absorption heat pump unit of the present invention uses heat pipe 13 to exchange heat between the refrigerant of the evaporator 7d and the sewage, that is, the high temperature side of the so-called tap water preheater 5 A heat pipe 13 is arranged between the water outlet and the evaporator 7d. One end of the heat pipe 13 is arranged in the evaporator 7d, and the other end is arranged with the water outlet on the high temperature side of the tap water preheater 5, thereby improving heat exchange efficiency and reducing sewage drainage. temperature.

As shown in Figure 3, the high temperature side water outlet of the tap water preheater 5 of the direct-fired absorption heat pump unit direct heat exchange system of the present invention is directly connected with the cooling inlet of the evaporator 7d, and the cooling outlet of the evaporator 7d is connected with the cooling inlet of the evaporator 7d. The sewage outlets are connected, that is, the sewage directly enters the evaporator 7d and directly exchanges heat with the refrigerant in the evaporator 7d.

The absorption heat pump unit 7 may be a single-effect absorption heat pump unit or a double-effect absorption heat pump unit.

During the operation of the present invention, the ninth valve 18 controls the size of the tap water flow according to the change of the liquid level of the hot water storage tank 1. When the liquid level is high, the valve is closed, and the flow of tap water entering the feed water pump 8 decreases. 8 inlet pressure changes, the hot water in the hot water storage tank 1 enters the inlet of the feed water pump 8 through the bypass pipe, mixes with the tap water, enters the system through the feed water pump 8 to raise the temperature, and when the ninth valve 18 is completely closed, the storage is fully realized. The hot water in the hot water tank is reheated by circulation; when the liquid level is low, open the valve to increase the flow of tap water entering the feed water pump 8, and the inlet pressure of the feed water pump gradually increases. Due to the pressure change, it enters the feed water pump through the bypass pipe 8 The amount of hot water is reduced. If the inlet pressure of the feedwater pump 8 is higher than the pressure in the hot water storage tank 1, hot water cannot flow into the inlet of the feedwater pump 8 through the bypass pipeline, but due to the function of the check valve 11, tap water cannot enter the storage tank through the bypass pipeline. hot water tank. The eleventh valve 20, which is arranged in the tap water side bypass line of the tap water preheater 5, is switched on and off according to the temperature of the tap water entering the tap water preheater 5. When the tap water temperature before entering the tap water preheater 5 is higher than the sewage temperature , the valve is open, and the tap water is not preheated. This measure not only realizes the circulation and reheating of the hot water in the hot water storage tank 1, but also ensures the stability of the water entering the absorption heat pump unit, which is beneficial to the stable operation of the unit.

As shown in Figure 4, the steam or hot water driven absorption heat pump unit indirect heat exchange system of the present invention includes a hot water storage tank 1, a sewage tank 2, tap water pipes and an absorption heat pump unit 7. The heat pump unit 7 is a steam or hot water driven heat pump unit; a feed water pump 8 is arranged on the tap water pipe, and the water outlet of the feed water pump 8 is connected to the low-temperature side water inlet of the tap water preheater 5, and the water outlet of the feed water pump 8 A second valve 9b is arranged between the low temperature side water inlet of the tap water preheater 5, the low temperature side water outlet of the tap water preheater 5 communicates with the water inlet of the absorber 7b of the absorption heat pump unit 7, and the absorber 7b The water outlet is connected with the water inlet of the condenser 7c, and the water outlet of the condenser 7c is connected with the hot water tank 1; The water inlets are connected, and a first valve 9a is set between the water outlet of the feedwater pump 8 and the water inlet of the heat exchanger 17, and the water outlet of the low temperature side of the heat exchanger 17 is directly connected with the heat storage tank 1; The water inlet and outlet of the high temperature side of 17 are respectively connected with the steam or hot water outlet and inlet of the generator 7a of the absorption heat pump unit 7; the water outlet of the sewage pool 2 is connected with the water inlet of the filter 3, and the filter 3 The water outlet of the tap water preheater 5 is connected with the high temperature side water inlet, and the high temperature side outlet water of the tap water preheater 5 is connected with the sewage outlet after exchanging heat with the evaporator 7d.

When bathing starts, there is no sewage in the sewage pool 2, and waste heat recovery cannot be performed, and the absorption heat pump unit 7 is in a shutdown state. Now, the sixth valve 15a and the seventh valve 15b are all closed, the first valve 9a and the eighth valve 16 on the tap water pipeline are opened, the second valve 9b is closed, and the tap water is heated by steam or hot water in the heat exchanger 17 Enter the hot water storage tank 1. When the sewage is collected to a certain extent, both the sixth valve 15a and the seventh valve 15b are opened, the first valve 9a and the eighth valve 16 on the tap water pipeline are closed, the second valve 9b is opened, and the heat pump unit is started. After the tap water is pressurized by the feed water pump 8, it enters the tap water preheater 5 and exchanges heat directly with the sewage, and then enters the absorber 7b and the condenser 7c in turn to heat up to the required hot water temperature and then enters the hot water storage tank 1, and the sewage is in the sewage After being purified in the pool 2, it passes through the filter 3, pressurized by the sewage pump 4, enters the tap water preheater 5 to directly exchange heat with tap water, then enters the sewage heat exchanger 6, and indirectly exchanges heat with the evaporator system 7d refrigerant to cool down discharge, so as to realize the recovery and utilization of heat in the sewage.

As shown in Figure 5, the heat pipe heat exchange system of the steam or hot water driven absorption heat pump unit of the present invention adopts heat pipe 13 to exchange heat between the refrigerant of the evaporator 7d and the sewage, that is, the so-called tap water preheater 5 A heat pipe 13 is arranged between the water outlet on the high temperature side and the evaporator 7d. One end of the heat pipe 13 is arranged in the evaporator 7d, and the other end is arranged with the water outlet on the high temperature side of the tap water preheater 5, thereby improving the heat exchange efficiency. Reduce the sewage discharge temperature.

As shown in Figure 6, the high-temperature side water outlet of the tap water preheater 5 of the steam or hot water driven absorption heat pump unit direct heat exchange system of the present invention is directly connected with the cooling inlet of the evaporator 7d, and the evaporator 7d The cooling outlet is connected with the sewage outlet, that is, the sewage directly enters the evaporator 7d and directly exchanges heat with the refrigerant of the evaporator 7d.

Claims (12)

1. a system that utilizes absorption heat pump to reclaim bath sewage used heat comprises hot water storage tank (1), cesspool (2), running water pipe and absorption type heat pump assembly (7), it is characterized in that: said absorption type heat pump assembly (7) is direct-fired source pump; Dispose feed pump (8) on the running water pipe; A road of the delivery port of feed pump (8) is connected with the low temperature side water inlet of running water preheater (5); The low temperature side delivery port of running water preheater (5) is connected with the water inlet of the absorber (7b) of absorption type heat pump assembly (7); The delivery port of absorber (7b) is connected with the water inlet of condenser (7c), and the delivery port of condenser (7c) is connected with hot water storage tank (1); Another road of the delivery port of feed pump (8) is connected with the water inlet of the flue gas heat exchange device (14) of absorption type heat pump assembly (7), the delivery port of flue gas heat exchange device (14) directly be connected with hot water storage tank (1) or insert the generator (7a) of absorption type heat pump assembly (7) after be connected with hot water storage tank (1) again; The delivery port of cesspool (2) is connected with the water inlet of filter (3), and the delivery port of filter (3) is connected with the high temperature side water inlet of running water preheater (5), is connected with sewage draining exit after the high temperature side water outlet of running water preheater (5) and evaporimeter (7d) heat exchange.

2. system that utilizes absorption heat pump to reclaim bath sewage used heat; Comprise hot water storage tank (1), cesspool (2), running water pipe and absorption type heat pump assembly (7), it is characterized in that: said absorption type heat pump assembly (7) is steam or hot water flooding's dynamic formula source pump; Dispose feed pump (8) on the running water pipe; A road of the delivery port of feed pump (8) is connected with the low temperature side water inlet of running water preheater (5); The low temperature side delivery port of running water preheater (5) is connected with the water inlet of the absorber (7b) of absorption type heat pump assembly (7); The delivery port of absorber (7b) is connected with the water inlet of condenser (7c), and the delivery port of condenser (7c) is connected with hot water storage tank (1); Another road of the delivery port of feed pump (8) is connected with the low temperature side water inlet of the heat exchanger (17) of absorption type heat pump assembly (7), and the low temperature side delivery port of heat exchanger (17) directly is connected with hot water storage tank (1); The entery and delivery port of the high temperature side of heat exchanger (17) goes out with the steam or the hot water of the generator (7a) of absorption type heat pump assembly (7) respectively, import is connected; The delivery port of cesspool (2) is connected with the water inlet of filter (3), and the delivery port of filter (3) is connected with the high temperature side water inlet of running water preheater (5), is connected with sewage draining exit after the high temperature side water outlet of running water preheater (5) and evaporimeter (7d) heat exchange.

3. system according to claim 1 and 2; It is characterized in that: dispose the 9th valve (18) on the running water pipe of said feed pump (8) front end, dispose controller on the 9th valve (18) according to its unlatching running water flow size of variation control of hot water storage tank (1) liquid level.

4. system according to claim 1 and 2; It is characterized in that: dispose sewage heat exchanger (6) between the high temperature side delivery port of said running water preheater (5) and evaporimeter (7d), the evaporation side of the low temperature side of said sewage heat exchanger (6) and evaporimeter (7d) constitutes closed circuit.

5. system according to claim 1 and 2; It is characterized in that: dispose heat pipe (13) between the high temperature side delivery port of said running water preheater (5) and evaporimeter (7d); Said heat pipe (13) one ends are arranged in the evaporimeter (7d), the high temperature side delivery port phase configuration of the other end and running water preheater (5).

6. system according to claim 1 and 2 is characterized in that: the high temperature side delivery port of said running water preheater (5) directly is connected with the cooling inlet of evaporimeter (7d), and the coolant outlet of evaporimeter (7d) is connected with sewage draining exit.

7. system according to claim 1 and 2 is characterized in that: between the water inlet of hot water storage tank (1) and feed pump (8), a bypass pipe road is set, and its pipeline is provided with non-return valve (11).

8. system according to claim 1 and 2 is characterized in that: described absorption type heat pump assembly (7) adopts the single-effective absorption source pump.

9. system according to claim 1 and 2 is characterized in that: described absorption type heat pump assembly (7) adopts the double effect absorption type heat pump unit.

10. method of utilizing absorption heat pump to reclaim bath sewage used heat; The system that realizes this method comprises hot water storage tank (1), cesspool (2), running water pipe and absorption type heat pump assembly (7); It is characterized in that: after feed pump (8) pressurization, divide two-way running water; After one tunnel entering absorption type heat pump assembly (7) heat exchange, directly get into generator (7a) the heat absorption intensification back entering hot water storage tank (1) of hot water storage tank (1) or entering absorption type heat pump assembly (7); Another road then gets in the running water preheater (5) and the sewage direct heat transfer, and absorber (7b) and condenser (7c) heat absorption that absorption type heat pump assembly (7) are passed through in the water outlet more respectively back of heating up gets into hot water storage tank (1) as the bathing water; Adopt cesspool (2) to collect waste water of bath and purify, the sewage after the purification filters through filter (3), gets into running water preheater (5) by sewage pump (4) pressurization back again, and at first with the running water heat exchange, water outlet is discharged again with after the cold-producing medium heat exchange of evaporimeter (7d).

11. method according to claim 10 is characterized in that: said absorption type heat pump assembly (7) is direct-fired absorption type heat pump assembly or steam or hot water flooding's dynamic formula absorption type heat pump assembly.

12. method according to claim 10; It is characterized in that: carry out indirect heat exchange through sewage heat exchanger (6) is set between the cold-producing medium of said evaporimeter (7d) and the sewage; Or adopt heat pipe (13) to carry out heat exchange, or let sewage directly get into the cold-producing medium direct heat transfer of evaporimeter (7d) and evaporimeter (7d).

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