Barley germination waste heat recovery coupled with malt drying exhaust waste heat recovery system

Abstract

The barley germination waste heat recovery coupling malt drying exhaust waste heat recovery system, including malt drying system, steam heating system, waste heat recovery system, germination refrigeration system, the malt drying system, including malt drying room, waste heat recovery device, steam heater, steam heat source, drying fresh air machine and waste heat recovery device fresh air outlet link, waste heat recovery device air supply outlet pipeline is divided into two, first through the air valve 1, air valve group 2 connects the steam heater fresh air outlet, and then from the steam heater air supply outlet air valve group 2 is transported to the malt drying room, the malt drying room exhaust outlet connects the waste heat recovery device return air inlet, the waste heat recovery device exhaust outlet is connected through the pipeline two places, the first is air valve 3, the second connects the recovery gas water heat exchanger return air inlet of waste heat recovery system, the second is connected through the air valve group 1 and the heating gas water heat exchanger fresh air inlet of waste heat recovery system.

Description

Technical Field

[0001] This invention belongs to the field of waste heat utilization in barley production, and relates to a system for the recovery of waste heat from barley germination and the in-depth application of waste heat from malt drying. Background Technology

[0002] Malt is the main raw material for beer production. Barley malting involves multiple processing steps. After germination, barley typically has a moisture content of 42%-48%. Drying reduces this moisture content to around 4% for storage. The drying process varies depending on the specific beer brewing requirements. During drying, the malt undergoes different temperature stages. At high temperatures, the sugars in the malt undergo caramelization, producing different colors and flavors. Currently, malt drying often involves heating the air with high-temperature steam. This results in high-temperature, high-humidity air with a very large air volume. This high-humidity air is typically processed through heat exchangers to recover sensible heat and some latent heat. The exhaust temperature is higher than the outdoor air temperature. This is particularly problematic in northern malt processing plants where winter air temperatures are low, requiring significant heat to heat the fresh air. This drying method is energy-intensive and wasteful, no longer meeting national requirements for industrial energy conservation, carbon reduction, and future development. Although summer is not the main time for wheat production, there are still some production tasks. During summer production, soaking and germination of wheat require refrigeration units to cool the fresh air. While cooling down, carbon dioxide is discharged to provide oxygen for the malt, and heat is discharged outdoors through cooling towers. Summary of the Invention

[0003] This invention utilizes a waste heat recovery system for barley germination coupled with a waste heat recovery system for malt drying exhaust. It employs a waste heat recovery system generated during refrigeration coupled with an absorption heat pump as a supplement to the secondary waste heat recovery of the drying exhaust. This system performs secondary waste heat recovery on the low-temperature, high-humidity air emitted during the malt drying process. After being heated by the absorption heat pump, the fresh air is then heated. This significantly reduces energy waste in both summer and winter, while also reducing steam consumption.

[0004] This invention is implemented as follows: a barley germination waste heat recovery coupled malt drying exhaust waste heat recovery system includes a malt drying system, a steam heating system, a waste heat recovery system, and a germination refrigeration system. The malt drying system includes a malt drying chamber (1), a waste heat recovery unit (2), a steam heater (5), and a steam heat source (7). A drying fresh air fan (8-1) is connected to the fresh air inlet of the waste heat recovery unit (2). The air outlet pipe of the waste heat recovery unit (8) is divided into two lines. The first line passes through air valve 1 (9-1) and air valve group 2 (9-1). -5) After connecting the fresh air inlet of the steam heater (5), the air is delivered from the air valve group 2 (9-5) of the steam heater (5) to the malt drying room (1). The exhaust air outlet of the malt drying room (1) is connected to the return air outlet of the waste heat recovery unit (2). The exhaust air outlet of the waste heat recovery unit (2) is connected to two places through pipes. The first place is the air valve 3 (9-3), and the second place is connected to the return air outlet of the recovery gas-water heat exchanger (3) of the waste heat recovery system. The second line is connected to the fresh air inlet of the heating gas-water heat exchanger (4) of the waste heat recovery system through the air valve group 1 (9-4).

[0005] The steam heating system includes a steam trap (11-1), a steam trap 2 (11-2), a water storage tank 1 (12), a water pump 2 (12), a water pump 1 (10-5), a water pump 1 (10-6), and a steam heat source (7). The steam heat source (7) supplies steam to two locations via pipelines. The first location is connected to the steam inlet of the steam heater (5). The condensate outlet of the steam heater (5) is connected to the steam trap 1 (11-1), the water storage tank 1 (12-1), and the water pump 2 (10-6). The water pump is connected to the steam heat source (7). The second location is the inlet of the absorption heat pump (6) generator. The outlet of the absorption heat pump (6) generator is connected to the steam trap 2 (11-2), the water storage tank 2 (12-2), and the water pump 1 (10-5). The condensate is transported back to the steam heat source (7) via the water pump 1 (10-5).

[0006] The waste heat recovery system comprises a recovery gas-water heat exchanger (3), a heating gas-water heat exchanger (4), and an absorption heat pump (6). The return air port of the recovery gas-water heat exchanger (3) is connected to the exhaust port of the waste heat recovery unit (2). The exhaust port of the recovery gas-water heat exchanger (3) is connected to the exhaust pipe. The cooling water supply and return port of the recovery gas-water heat exchanger (3) is equipped with valve group 1 (13-1). The supply port is connected to the circulation pump 2 (10-2) through a pipe. The circulation pump 2 (10-2) is connected to the evaporator inlet of the absorption heat pump (6) through a pipe. The evaporator outlet of the absorption heat pump (6) is connected to valve group 1 (13-1) through a pipe and then connected to the cooling water return port of the recovery gas-water heat exchanger (3).

[0007] The heating gas-water heat exchanger (4) is equipped with a valve group 1 (9-4) at its fresh air inlet and fresh air outlet. The front end of the fresh air inlet valve group 1 (9-4) is connected to the air outlet of the waste heat recovery unit (2). The air outlet valve group 1 (9-4) of the heating gas-water heat exchanger (4) is connected to two locations. The first location is connected to the malt drying room (1) through a valve 2 (9-2). When the drying air temperature is below 50℃, the valve 2 (9-2) is opened and the valve group 2 (9-5) is closed. The second location is connected to the fresh air inlet of the steam heater (5) through a valve group 2 (9-5). The upper end of the high-temperature water return port of the heating gas-water heat exchanger (4) is connected to the circulating pump 1 (10-1), and the front end of the circulating pump 1 (10-1) is connected to the condenser water supply port of the absorption heat pump (6). The high-temperature water supply port of the heating gas-water heat exchanger (4) is connected to the condenser water return port of the absorption heat pump (6). The air valve 2 (9-2) and the air valve group 2 (9-5) are used to control the equipment connected to the air outlet of the waste heat recovery unit (2). When the waste heat is sufficient, the air valve 2 (9-2) is opened and the air valve group 2 (9-5) is closed to stop the operation of the steam heat source (7). The waste heat recovery unit (2) air outlet first heats the fresh air through the heating gas-water heat exchanger (4) and then connects to the malt drying room (1) through the air duct. When the waste heat temperature is insufficient, the air valve 2 (9-2) is closed, the air valve group 2 (9-5) is opened, and the steam heat source (7) is turned on. The waste heat recovery unit (2) air outlet is connected to the fresh air inlet of the heating gas-water heat exchanger (4) through the pipe, and the steam heater (5) fresh air inlet is connected through the air outlet of the heating gas-water heat exchanger (4). The fresh air entering the steam heater (5) is heated by the steam heat source (7).

[0008] The germination refrigeration system includes a chiller (14), an air-water heat exchanger (15), a cooling tower (17), and a germination bed (16). The chilled water outlet of the evaporator of the chiller (14) is connected to a circulating pump 3 (10-3), which is connected to the chilled water inlet of the air-water heat exchanger (15). The chilled water outlet of the air-water heat exchanger (15) is connected to the chilled water return of the chiller (14). A fan (8-2) is installed at the fresh air inlet of the air-water heat exchanger (15), and the air outlet of the air-water heat exchanger (15) is connected to the germination bed (16). The germination bed is equipped with a germination bed exhaust (16-1). The cooling water outlet of the condenser of the chiller (14) is connected to two locations via pipes. The first location is the cooling water outlet of the condenser of the chiller (14), which is connected to the cooling water inlet of the cooling tower (17) via a pipe connected to valve group 3 (13-3). The cooling water outlet of the cooling tower (17) is connected to the cooling water inlet of the condenser of the chiller (14) via valve group 3 (13-3). The cooling water outlet of the condenser of the second chiller (14) is connected to the circulating pump 2 (10-2) after the valve group 2 (13-2) via a pipeline. The circulating pump 2 (10-2) is connected to the return water port of the evaporator of the absorption heat pump (6). The water supply port of the evaporator of the absorption heat pump (6) is connected to the cooling water return port of the evaporator of the chiller (14) via the valve group 2 (13-2). At this time, the pipeline from the valve group 1 (13-1) to the recovery gas-water heat exchanger (3) is closed.

[0009] The beneficial effects of this invention are:

[0010] 1. Secondary recovery of the drying exhaust gas further lowers the exhaust temperature and effectively recovers low-temperature waste heat.

[0011] 2. In summer, the waste heat generated by the refrigeration unit is coupled with a waste heat recovery system to supplement the waste heat during high temperatures and avoid the shutdown of the waste heat recovery equipment in summer.

[0012] 3. Use the recovered waste heat as the base heat for drying air. Adjust the air duct path according to the drying and roasting temperature. When high temperature is required, use steam for secondary heating. Attached Figure Description

[0013] Figure 1 This is a system diagram of the present invention.

[0014] As shown in the diagram: 1. Malt drying room, 2. Waste heat recovery unit, 3. Recovery gas-water heat exchanger, 4. Heating gas-water heat exchanger, 5. Steam heater, 6. Absorption heat pump, 7. Steam boiler, 8-1. Drying fresh air unit, 8-2. Germination fresh air unit, 9-1. Air valve 1, 9-2. Air valve 2, 9-3. Air valve 3, 9-4. Air valve assembly 1, 9-5. Air valve assembly 2, 10-1. Circulation pump 1, 10-2. Circulation pump 2 10-3. Circulating pump 3, 10-4. Circulating pump 4, 10-5. Water pump 1, 10-6. Water pump 2, 11-1. Steam trap 1, 11-2. Steam trap 2, 12-1. Water storage tank 1, 12-2. Water storage tank 2, 13-1. Valve assembly 1, 13-2. Valve assembly 2, 13-3. Valve assembly 3, 14. Refrigeration unit, 15. Gas-water heat exchanger, 16. Germination bed, 16-1. Germination bed exhaust, 17. Cooling tower. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] I. Low-temperature hot air drying mode

[0017] Open valve group 1 (13-1), air valve 2 (9-2), air valve group 1 (9-4), close valve group 2 (13-2), air valve 1 (9-1), air valve 3 (9-3), air valve group 2 (9-5), the exhaust of malt drying room (1) is connected to the return air port of waste heat recovery device (2) for heat exchange, after heat exchange is sent to the return air port of recovery gas-water heat exchanger (3) through the exhaust port of waste heat recovery device (2), and discharged through the exhaust port of recovery gas-water heat exchanger (3).

[0018] The fresh air dryer (8-1) sends fresh air into the fresh air inlet of the waste heat recovery unit (2), and then into the fresh air inlet of the heating gas-water heat exchanger (4) through the air outlet of the waste heat recovery unit (2), and then from the air outlet of the heating gas-water heat exchanger (4) to the malt drying room (1) to complete the fresh air circulation.

[0019] Steam heat source (7) delivers steam to the inlet of the absorption heat pump (6) generator through a pipeline. Condensate is discharged from the generator outlet, enters the water storage tank (12-2) through the steam trap 2 (11-2), and is transported back to steam heat source (7) through water pump 1 (10-5) to complete the cycle.

[0020] II. High-Temperature Hot Air Drying Mode

[0021] Open valve group 1 (13-1), air valve group 1 (9-4), and air valve group 2 (9-5), and close valve group 2 (13-2), air valve 1 (9-1), air valve 2 (9-2), and air valve 3 (9-3). The exhaust of the malt drying room (1) is connected to the return air port of the waste heat recovery unit (2) for heat exchange. After heat exchange, it is transported to the return air port of the recovery gas-water heat exchanger (3) through the exhaust port of the waste heat recovery unit (2) and discharged through the exhaust port of the recovery gas-water heat exchanger (3).

[0022] The fresh air drying fan (8-1) sends fresh air into the fresh air inlet of the waste heat recovery unit (2), and through the air outlet of the waste heat recovery unit (2), it sends fresh air into the fresh air inlet of the heating gas-water heat exchanger (4), and from the air outlet of the heating gas-water heat exchanger (4), it is delivered to the fresh air inlet of the steam heater (5), and from the air outlet of the steam heater (5), it is delivered to the malt drying room (1) to complete the fresh air circulation.

[0023] Steam is supplied to two devices via pipelines. First, it is supplied to the inlet of the absorption heat pump (6) generator. Condensate is discharged from the generator outlet, passes through the steam trap 2 (11-2) and enters the water storage tank 2 (12-2). It is then pumped back to the steam heat source (7) by the water pump 1 (10-5) to complete the cycle. Second, it is supplied to the steam inlet of the steam heater (5). Condensate is discharged from the steam outlet of the steam heater (5), passes through the steam trap 1 (11-1) and enters the water storage tank 1 (12-1). It is then pumped back to the steam heat source (7) by the water pump 1 (10-5) to complete the cycle.

[0024] III. Low-temperature hot air drying state with coupled germination waste heat

[0025] Open valve group 2 (13-2), air valve 2 (9-2), air valve 3 (9-3), air valve group 1 (9-4), close valve group 1 (13-1), valve group 3 (13-3), air valve 1 (9-1), air valve group 2 (9-5), close cooling tower (17), close circulating pump 4 (10-4), connect the chilled water supply port of the evaporator of the chiller (14) to the circulating pump (3), the circulating pump (3) supplies chilled water to the chilled water inlet of the gas-water heat exchanger (15), and then transports it back to the chilled water return port of the evaporator of the chiller (14) from the chilled water outlet of the gas-water heat exchanger (15), connect the cooling water outlet of the condenser of the chiller (14) to the circulating pump 2 (10-2), connect the circulating pump 2 (10-2) to the evaporator inlet of the absorption heat pump (6), and input it back to the cooling water return port of the condenser of the chiller (14) from the evaporator outlet.

[0026] The exhaust of the malt drying room (1) is connected to the return air port of the waste heat recovery unit (2) for heat exchange. After heat exchange, the exhaust is sent to the air valve 3 (9-3) through the exhaust port of the waste heat recovery unit (2) for discharge.

[0027] The fresh air dryer (8-1) sends fresh air into the fresh air inlet of the waste heat recovery unit (2), and then into the fresh air inlet of the heating gas-water heat exchanger (4) through the air outlet of the waste heat recovery unit (2), and then from the air outlet of the heating gas-water heat exchanger (4) to the malt drying room (1) to complete the fresh air circulation.

[0028] Steam heat source (7) delivers steam to the inlet of the absorption heat pump (6) generator through a pipeline. Condensate is discharged from the generator outlet, enters the water storage tank (12-2) through the steam trap 2 (11-2), and is transported back to steam heat source (7) through water pump 1 (10-5) to complete the cycle.

[0029] IV. Coupling Germination Waste Heat High-Temperature Hot Air Drying State

[0030] Open valve group 2 (13-2), air valve 3 (9-3), air valve group 1 (9-4), air valve group 2 (9-5), close valve group 1 (13-1), valve group 3 (13-3), air valve 1 (9-1), air valve 2 (9-2), close cooling tower (17), close circulating pump 4 (10-4), connect the chilled water supply port of the evaporator of the chiller (14) to the circulating pump (3), the circulating pump (3) supplies chilled water to the chilled water inlet of the gas-water heat exchanger (15), and then transports it back to the chilled water return port of the evaporator of the chiller (14) from the chilled water outlet of the gas-water heat exchanger (15), connect the cooling water outlet of the condenser of the chiller (14) to the circulating pump 2 (10-2), connect the circulating pump 2 (10-2) to the evaporator inlet of the absorption heat pump (6), and input it back to the cooling water return port of the condenser of the chiller (14) from the evaporator outlet.

[0031] The exhaust of the malt drying room (1) is connected to the return air port of the waste heat recovery unit (2) for heat exchange. After heat exchange, the exhaust is sent to the air valve 3 (9-3) through the exhaust port of the waste heat recovery unit (2) for discharge.

[0032] The fresh air drying fan (8-1) sends fresh air into the fresh air inlet of the waste heat recovery unit (2), and through the air outlet of the waste heat recovery unit (2), it sends fresh air into the fresh air inlet of the heating gas-water heat exchanger (4), and from the air outlet of the heating gas-water heat exchanger (4), it is delivered to the fresh air inlet of the steam heater (5), and from the air outlet of the steam heater (5), it is delivered to the malt drying room (1) to complete the fresh air circulation.

[0033] Steam is supplied to two devices via pipelines. First, it is supplied to the inlet of the absorption heat pump (6) generator. Condensate is discharged from the generator outlet, passes through the steam trap 2 (11-2) and enters the water storage tank 2 (12-2). It is then pumped back to the steam heat source (7) by the water pump 1 (10-5) to complete the cycle. Second, it is supplied to the fresh air inlet of the steam heater (5). Condensate is discharged from the fresh air outlet of the steam heater (5), passes through the steam trap 1 (11-1) and enters the water storage tank 1 (12-1). It is then pumped back to the steam heat source (7) by the water pump 1 (10-5) to complete the cycle.

[0034] This invention is not limited to this embodiment. Any equivalent concept or modification within the technical scope disclosed in this invention shall be included within the protection scope of this invention.

Claims

1. A waste heat recovery system for barley germination coupled with waste heat recovery from malt drying exhaust gas, characterized in that: The system includes a malt drying system, a steam heating system, a waste heat recovery system, and a germination refrigeration system. The malt drying system includes a malt drying chamber (1), a waste heat recovery unit (2), a steam heater (5), and a steam heat source (7). The drying fresh air fan (8-1) is connected to the fresh air inlet of the waste heat recovery unit (2). The air outlet pipe of the waste heat recovery unit (8) is divided into two lines. The first line is connected to the fresh air inlet of the steam heater (5) through air valve 1 (9-1) and air valve group 2 (9-5). Afterwards, the steam is delivered from the steam heater (5) air outlet valve group 2 (9-5) to the malt drying room (1). The exhaust port of the malt drying room (1) is connected to the return air port of the waste heat recovery unit (2). The exhaust port of the waste heat recovery unit (2) is connected to two places through pipes. The first place is the air valve 3 (9-3), and the second place is connected to the return air port of the recovery gas-water heat exchanger (3) of the waste heat recovery system. The second line is connected to the fresh air port of the heating gas-water heat exchanger (4) of the waste heat recovery system through the air valve group 1 (9-4).

2. The waste heat recovery system for barley germination coupled with waste heat recovery from malt drying exhaust gas as described in claim 1, characterized in that: The steam heating system includes a steam trap (11-1), a steam trap 2 (11-2), a water tank 1 (12), a water tank 2 (12), a water pump 1 (10-5), a water pump (10-6), and a steam heat source (7). The steam heat source (7) supplies steam to two locations through pipelines. The first location is connected to the steam inlet of the steam heater (5). The condensate outlet of the steam heater (5) is connected to the steam trap 1 (11-1), the water tank 1 (12-1), and the water pump 2 (10-6). The water pump is connected to the steam heat source (7). The second location is the inlet of the absorption heat pump (6) generator. The outlet of the absorption heat pump (6) generator is connected to the steam trap 2 (11-2), the water tank 2 (12-2), and the water pump 1 (10-5). The condensate is transported back to the steam heat source (7) through the water pump 1 (10-5).

3. The waste heat recovery system for barley germination coupled with waste heat recovery from malt drying exhaust gas as described in claim 1, characterized in that: The waste heat recovery system consists of a recovery gas-water heat exchanger (3), a heating gas-water heat exchanger (4), and an absorption heat pump (6). The return air port of the recovery gas-water heat exchanger (3) is connected to the exhaust port of the waste heat recovery unit (2). The exhaust port of the recovery gas-water heat exchanger (3) is connected to the exhaust pipe. The cooling water supply and return port of the recovery gas-water heat exchanger (3) is equipped with valve group 1 (13-1). The supply port is connected to the circulation pump 2 (10-2) through a pipe. The circulation pump 2 (10-2) is connected to the evaporator inlet of the absorption heat pump (6) through a pipe. The evaporator outlet of the absorption heat pump (6) is connected to valve group 1 (13-1) through a pipe and then connected to the cooling water return port of the recovery gas-water heat exchanger (3).

4. The waste heat recovery system for barley germination coupled with waste heat recovery from malt drying exhaust gas as described in claim 1, characterized in that: The waste heat recovery system consists of a recovery gas-water heat exchanger (3), a heating gas-water heat exchanger (4), and an absorption heat pump (6). The return air port of the recovery gas-water heat exchanger (3) is connected to the exhaust port of the waste heat recovery unit (2). The exhaust port of the recovery gas-water heat exchanger (3) is connected to the exhaust pipe. The cooling water supply and return port of the recovery gas-water heat exchanger (3) is equipped with valve group 1 (13-1). The supply port is connected to the circulation pump 2 (10-2) through a pipe. The circulation pump 2 (10-2) is connected to the evaporator inlet of the absorption heat pump (6) through a pipe. The evaporator outlet of the absorption heat pump (6) is connected to valve group 1 (13-1) through a pipe and then connected to the cooling water return port of the recovery gas-water heat exchanger (3).

5. According to claim 4, the waste heat recovery system for barley germination coupled with waste heat recovery system for malt drying exhaust is provided with a group of air valves 1 (9-4) at the fresh air inlet and fresh air outlet of the heating gas-water heat exchanger (4). The front end of the fresh air inlet air valve group 1 (9-4) is connected to the air outlet of the waste heat recovery unit (2). The air outlet air valve group 1 (9-4) of the heating gas-water heat exchanger (4) is connected to two places respectively. The first place is connected to the malt drying room (1) through the air valve 2 (9-2). When the drying air temperature is below 50℃, the air valve 2 (9-2) is opened and the air valve group 2 (9-5) is closed. The second place is connected to the fresh air inlet of the steam heater (5) through the air valve group 2 (9-5). The upper end of the high temperature water return port of the heating gas-water heat exchanger (4) is connected to the circulation pump 1 (10-1). The front end of the circulation pump 1 (10-1) is connected to the condenser water supply port of the absorption heat pump (6). (4) The high-temperature water supply port is connected to the condenser return port of the absorption heat pump (6). The air valve 2 (9-2) and air valve group 2 (9-5) are used to control the equipment connected to the air outlet of the waste heat recovery unit (2). When the waste heat is sufficient, the air valve 2 (9-2) is opened and the air valve group 2 (9-5) is closed to stop the operation of the steam heat source (7). The air outlet of the waste heat recovery unit (2) first heats the fresh air through the heating gas-water heat exchanger (4) and then connects to the malt drying room (1) through the air pipe. When the waste heat temperature is insufficient, the air valve 2 (9-2) is closed and the air valve group 2 (9-5) is opened to turn on the steam heat source (7). The air outlet of the waste heat recovery unit (2) is connected to the fresh air inlet of the heating gas-water heat exchanger (4) through the pipe. The air outlet of the heating gas-water heat exchanger (4) is connected to the fresh air inlet of the steam heater (5). The fresh air entering the steam heater (5) is heated by the steam heat source (7).

6. The waste heat recovery system for barley germination coupled with waste heat recovery from malt drying exhaust gas as described in claim 1, characterized in that: The germination refrigeration system includes a chiller (14), an air-water heat exchanger (15), a cooling tower (17), and a germination bed (16). The chilled water outlet of the evaporator of the chiller (14) is connected to a circulating pump 3 (10-3), which is connected to the chilled water inlet of the air-water heat exchanger (15). The chilled water outlet of the air-water heat exchanger (15) is connected to the chilled water return of the chiller (14). A fan (8-2) is installed at the fresh air inlet of the air-water heat exchanger (15), and the air outlet of the air-water heat exchanger (15) is connected to the germination bed (16). The germination bed is equipped with a germination bed exhaust (16-1). The cooling water outlet of the condenser of the chiller (14) is connected to two locations through pipes. The first location is where the chiller (14) cools the water. The condenser cooling water outlet is connected to the cooling tower (17) cooling water inlet via a pipe to valve group 3 (13-3). The cooling tower (17) cooling water outlet is connected to the condenser cooling water inlet of the chiller (14) via valve group 3 (13-3). The second condenser cooling water outlet of the chiller (14) is connected to the circulating pump 2 (10-2) after valve group 2 (13-2) via a pipe. The circulating pump 2 (10-2) is connected to the evaporator return water port of the absorption heat pump (6). The evaporator supply water port of the absorption heat pump (6) is connected to the evaporator cooling water return water port of the chiller (14) via valve group 2 (13-2). At this time, the pipeline from valve group 1 (13-1) to the recovery gas-water heat exchanger (3) is closed.

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