A large temperature difference cell type heat supply and heat supply and heat supply system and its operation method

Abstract

The application discloses a large-temperature-difference pool type heat supply and cold and heat combined supply system of a heat supply reactor and an operation method thereof, and the system comprises a pool type low-temperature heat supply reactor, a hot water storage tank, a single-effect absorption type cold and warm water machine, a gas direct combustion absorption type cold and warm water machine, a solution dehumidification unit, a water-water heat exchanger, a flue gas-water heat exchanger and the like. In the heat supply period in winter, the return water temperature of a primary heat supply network can be reduced to 15 or 25 DEG C; in the cooling period in summer, the single-effect absorption type cold and warm water machine and the solution dehumidification unit cooperate to realize the step utilization of the primary heat supply network water supply, and the return water temperature of the primary heat supply network is reduced to 60 DEG C; the heat supply reactor is coupled with the hot water storage tank, and the problem that the heat supply reactor and the cold and heat load cannot be matched in real time is effectively solved; the application not only realizes the flexible operation of the heat source side, but also increases the supply and return water temperature difference of the primary heat supply network, greatly reduces the initial construction cost of the primary heat supply network and the conveying energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear energy comprehensive utilization, in particular to a large-temperature-difference pool type heat supply reactor combined cooling and heating system and a running method thereof. BACKGROUND

[0002] Considering the operation safety of the low-temperature heat supply reactor, the low-temperature heat supply reactor needs to be built far away from the urban residential area. Generally, in the winter heating season, the supply / return water temperature of the secondary heat network is 60 / 45℃ respectively, so that the return water temperature of the primary heat network can be reduced to 50℃ at the lowest. The water temperature delivered by the low-temperature heat supply reactor to the primary heat network is only 90℃, and the maximum supply / return water temperature difference of the primary heat network is only 40℃. The lower supply / return water temperature difference results in a higher operation flow of the primary heat network, which not only increases the initial investment of the primary heat network and the primary heat network circulating pump, but also increases the transportation energy consumption of the primary heat network. In order to improve the transportation capacity of the primary heat network, a large-temperature-difference absorption heat exchanger unit can be configured at the user energy station.

[0003] On the other hand, when the pool type low-temperature heat supply reactor is used for centralized cooling in summer, the 90℃ heat network supply water is only suitable for driving the single-effect absorption refrigerator, and the temperature drop of the heat network supply water in the single-effect absorption refrigerator generator is only 10~15℃, resulting in a smaller heat network supply / return water temperature difference, which also increases the heat network transportation energy consumption. In addition, the supply / return water temperature of the single-effect absorption refrigerator is usually 7 / 12℃, and the energy efficiency ratio of the single-effect absorption refrigerator is usually only about 0.7. Based on the above reasons, in order to improve the primary heat network supply / return water temperature difference in the summer cooling season and improve the performance coefficient COP of the single-effect absorption refrigerator, a single-effect absorption refrigerator and a waste heat driven solution dehumidifier unit can be configured at the user energy station to independently control the temperature and humidity, and realize efficient cooling.

[0004] Since the user side cooling load and heating load both have the characteristics of periodic fluctuation, and in order to ensure the safety and stability of the operation, the low-temperature heat supply reactor is not suitable for frequent adjustment of the reactor core output power. In order to effectively solve the problem that the heat supply reactor cannot be matched with the cooling and heating load in real time, a centralized hot water storage tank needs to be arranged at the heat source side to realize the storage peak shaving. SUMMARY

[0005] In order to overcome the low utilization rate of the low-temperature heat supply reactor, the small supply / return water temperature difference, and the inability to flexibly adjust, the present application provides a large-temperature-difference pool type heat supply reactor combined cooling and heating system and a running method thereof. The system is configured with an absorption type cold and warm water machine, a water-water heat exchanger and a solution dehumidifier unit at the user energy station side, which not only improves the primary heat network supply / return water temperature difference in the heating and cooling seasons, but also improves the performance coefficient of the absorption type cold and warm water machine in the cooling season. Refrigeration In addition, the system is also configured with a storage tank at the heat source side, which realizes the real-time matching of the heat source side output power and the user side cooling and heating load demand, and improves the flexibility of the system.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] A large-temperature-difference pool type heat supply reactor combined cold and heat supply system, comprising a heat source side composed of a pool type low-temperature heat supply reactor 1, a first circulating water pump 2, a first heat exchanger 3, a second circulating water pump 4, a second heat exchanger 5, a third circulating water pump 6, a hot water storage tank 7, a first valve 8, a fourth circulating water pump 9, a second valve 10, a fifth circulating water pump 11, a third valve 12, a fourth valve 13, a fifth valve 14, a user energy station side composed of a sixth valve 15, a seventh valve 16, an eighth valve 17, a ninth valve 18, a tenth valve 19, an eleventh valve 20, a twelfth valve 21, a thirteenth valve 22, a sixth circulating water pump 23, a cooling tower 24, a fourteenth valve 25, a fifteenth valve 26, a first solution dehumidification unit 27, a second solution dehumidification unit 28, a water-water heat exchanger 29, a single-effect absorption cold and warm water machine 30, a gas direct-fired absorption cold and warm water machine 31, a flue gas-water heat exchanger 32, a sixteenth valve 33, a seventeenth valve 34, an eighteenth valve 35, a seventh circulating water pump 36, a heat user 37, a nineteenth valve 38, a twentieth valve 39, a twenty-first valve 40, a twenty-second valve 41, an eighth circulating water pump 42, a cold user 43, a twenty-third valve 44, a twenty-fourth valve 45, a ninth circulating water pump 46, a twenty-fifth valve 47, a twenty-sixth valve 48, a twenty-seventh valve 49, a twenty-eighth valve 50, a twenty-ninth valve 51, a thirtieth valve 52, a thirty-first valve 53.

[0008] Specific connection relationship is: the pool type low temperature heat supply reactor 1 one circuit water supply through connecting pipe in turn with first circulating water pump 2, first heat exchanger 3's hot side entrance is linked together, and the heat is transmitted to two circuits, and the cold side outlet of first heat exchanger 3 is linked together through connecting pipe in turn with second circulating water pump 4, second heat exchanger 5's hot side entrance, and the heat is transmitted to primary heat network, and the cold side outlet of second heat exchanger 5 is linked together through connecting pipe with third circulating water pump 6;Third circulating water pump 6 outlet is divided into two roads, first road is linked together through connecting pipe in turn with fourth valve 13, hot water storage tank 7 hot side entrance;Second road is linked together through connecting pipe in turn with fifth valve 14, single effect absorption type cold water machine 30's generator entrance;Single effect absorption type cold water machine 30's generator outlet is divided into two roads, first road is linked together through connecting pipe in turn with seventh valve 16, second solution dehumidification unit 28's regenerator heat source side entrance;Second road is linked together through connecting pipe in turn with eighth valve 17, water-water heat exchanger 29's hot side entrance;Water-water heat exchanger 29's hot side outlet is linked together through connecting pipe in turn with twenty-third valve 44, single effect absorption type cold water machine 30's evaporator entrance;Single effect absorption type cold water machine 30's evaporator outlet is linked together with twenty-sixth valve 48, and the outlet of twenty-sixth valve 48 is divided into two roads, first road is linked together through connecting pipe in turn with twenty-seventh valve 49, gas direct-fired absorption type cold water machine 31 evaporator entrance;Second road is linked together through connecting pipe with twenty-eighth valve 50, twenty-ninth valve 51;Gas direct-fired absorption type cold water machine 31 evaporator outlet is linked together through connecting pipe with twenty-ninth valve 51;The outlet of twenty-ninth valve 51, the regenerator heat source side outlet of second solution dehumidification unit 28 are all linked together with the sixth valve 15 of primary heat network backwater main pipe;The outlet of sixth valve 15 is divided into two roads, first road is linked together through connecting pipe in turn with first valve 8, hot water storage tank 7 cold side entrance;Second road is linked together through connecting pipe with second heat exchanger 5 cold side entrance;Hot water storage tank 7 cold side outlet is linked together through fourth circulating water pump 9, second valve 10 with second heat exchanger 5 cold side entrance in turn, and hot water storage tank 7 hot side outlet is linked together through fifth circulating water pump 11, third valve 12, fifth valve 14 with single effect absorption type cold water machine 30's generator entrance in turn;

[0009] Cold user 43 refrigerated water outlet is linked together through connecting pipe with ninth circulating water pump 46, and the outlet of ninth circulating water pump 46 is divided into two roads, first road is linked together through connecting pipe in turn with twenty-fourth valve 45, single effect absorption type cold water machine 30's evaporator entrance;Second road is linked together through connecting pipe in turn with thirtieth valve 52, twenty-seventh valve 49, gas direct-fired absorption type cold water machine 31's evaporator entrance;Single effect absorption type cold water machine 30's evaporator outlet, gas direct-fired absorption type cold water machine 31's evaporator outlet is linked together with refrigerated water supply main pipe through twenty-fifth valve 47, thirty-first valve 53 respectively;

[0010] The dilute solution return liquid outlet of the cold user 43 fresh air unit is connected to the eighth circulating water pump 42 through a connecting pipe, and the outlet of the eighth circulating water pump 42 is divided into two paths; the first path is connected to the regenerator solution side inlet of the first solution dehumidification unit 27 through a connecting pipe in sequence through the nineteenth valve 38, and the regenerator solution side outlet of the first solution dehumidification unit 27 is connected to the concentrated solution supply liquid main through a connecting pipe through the twentieth valve 39; the second path is connected to the regenerator solution side inlet of the second solution dehumidification unit 28 through a connecting pipe in sequence through the twenty-first valve 40, and the regenerator solution side outlet of the second solution dehumidification unit 28 is connected to the concentrated solution supply liquid main through a connecting pipe through the twenty-second valve 41;

[0011] The secondary heat network return water outlet of the hot user 37 is connected to the common node between the thirteenth valve 22 and the eighteenth valve 35 in sequence through the seventh circulating water pump 36 and the eighteenth valve 35; the cooling water supply outlet of the cooling tower 24 is connected to the common node between the thirteenth valve 22 and the eighteenth valve 35 in sequence through a connecting pipe through the sixth circulating water pump 23 and the thirteenth valve 22; the common node between the thirteenth valve 22 and the eighteenth valve 35 is connected to the ninth valve 18, the tenth valve 19, the eleventh valve 20, and the fifteenth valve 26 in four paths; the outlet of the ninth valve 18 is connected to the cold side of the water-water heat exchanger 29, the common node between the twelfth valve 21 and the seventeenth valve 34 in sequence through a connecting pipe; the outlet of the tenth valve 19 is connected to the absorber and condenser of the single-effect absorption cold water heater 30, the common node between the twelfth valve 21 and the seventeenth valve 34 in sequence through a connecting pipe; the outlet of the eleventh valve 20 is connected to the absorber and condenser of the gas direct-fired absorption cold water heater 31, the common node between the twelfth valve 21 and the seventeenth valve 34 in sequence through a connecting pipe; the outlet of the fifteenth valve 26 is connected to the cold side of the flue gas-water heat exchanger 32, the common node between the twelfth valve 21 and the seventeenth valve 34 in sequence through a connecting pipe; the common node between the twelfth valve 21 and the seventeenth valve 34 is divided into two paths, the first path is connected to the seventeenth valve 34 and the hot user 37 in sequence through a connecting pipe; the second path is connected to the twelfth valve 21 and the cooling tower 24 in sequence through a connecting pipe.

[0012] The working medium of the single-effect absorption cold water heater 30 and the gas direct-fired absorption cold water heater 31 is lithium bromide solution; the working medium of the first solution dehumidification unit 27 and the second solution dehumidification unit 28 is lithium chloride solution; the regenerator of the first solution dehumidification unit 27 is driven by the flue gas exhaust of the gas direct-fired absorption cold water heater 31, and the regenerator of the second solution dehumidification unit 28 is driven by the low-temperature hot water of the primary heat network after the generator of the single-effect absorption cold water heater 30 is cooled.

[0013] The operation method of the large-temperature-difference pool type heat supply reactor combined cooling and heating system is characterized in that the operation method comprises a heat source side operation method and a user energy station side operation method.

[0014] The heat source side operation method is as follows: when the heat load demand or the cold load demand of the user side is low and the output heat of the pool type low-temperature heat supply reactor 1 is still in surplus after meeting the user demand, a part of the primary heat network supply water at the outlet of the third circulating water pump 6 enters the hot water storage tank 7 for heat storage through the fourth valve 13; at the same time, the cold water of the same volume at the cold side outlet of the hot water storage tank 7 flows out of the hot water storage tank 7 in turn through the fourth circulating water pump 9 and the second valve 10, and then flows to the cold side inlet of the second heat exchanger 5.

[0015] When the heat load demand or the cold load demand of the user side is high and the output heat of the pool type low-temperature heat supply reactor 1 cannot meet the user demand, the hot water stored in the hot water storage tank 7 flows in turn through the fifth circulating water pump 11 and the third valve 12, and then is combined with the primary heat network supply water at the outlet of the third circulating water pump 6, and then is transported to the user energy station side together; at the same time, the cold water of the same volume at the cold side return of the primary heat network enters the cold side inlet of the hot water storage tank 7 through the first valve 8.

[0016] When the pool type low-temperature heat supply reactor 1 cannot meet the heat load demand or the cold load demand of the user side under full load operation, and the heat stored in the hot water storage tank 7 is released, the pool type low-temperature heat supply reactor 1 keeps full load operation, and all the output heat is transported to the user side, and at the same time, the gas direct-fired absorption type cold and warm water machine 31 of the user energy station side is started to perform peak shaving.

[0017] The user energy station side operation method comprises a summer cooling mode operation method and a winter heating mode operation method.

[0018] (1) Summer cooling mode operation method

[0019] The operation method of the primary heat network hot water process flow is as follows: the single-effect absorption type cold and warm water machine 30 is switched to the refrigeration mode, the primary heat network supply water from the heat source side enters the generator of the single-effect absorption type cold and warm water machine 30 to release heat and reduce temperature, and then further releases heat in the regenerator heat source side of the solution dehumidification machine set 28, and finally returns to the heat source side through the sixth valve 15.

[0020] The operation method of the cooling water process is as follows: in the off-peak period of cooling supply, when the water supply of the primary heat supply network can drive the single-effect absorption cold water machine 30 and the second solution dehumidification unit 28 to meet the cooling load demand of the cold users, the cooling water supply of the cooling tower 24 enters the single-effect absorption cold water machine 30 through the sixth circulating water pump 23, the thirteenth valve 22 and the tenth valve 19, is heated and raised in temperature by the absorber and the condenser of the single-effect absorption cold water machine 30, and is returned to the cooling tower 24; in the peak period of cooling supply, when the single-effect absorption cold water machine 30 and the second solution dehumidification unit 28 cannot meet the cooling load demand of the cold users, the gas direct-fired absorption cold water machine 31 is started to perform peak regulation; at this time, the cooling water supply of the cooling tower 24 is divided into two paths and enters the single-effect absorption cold water machine 30 and the gas direct-fired absorption cold water machine 31 to be heated and raised in temperature.

[0021] The operation method of the refrigerated water process is as follows: in the off-peak period of cooling supply, the refrigerated water return water enters the single-effect absorption cold water machine 30 evaporator in sequence through the ninth circulating water pump 46 and the twenty-fourth valve 45, is cooled by heat release, and is then supplied to the cold users 43 through the twenty-fifth valve 47; in the peak period of cooling supply, the gas direct-fired absorption cold water machine 31 is started to perform peak regulation, the refrigerated water return water enters the single-effect absorption cold water machine 30 evaporator and the gas direct-fired absorption cold water machine 31 evaporator to be cooled by heat release, and is then supplied to the cold users 43 together.

[0022] The operation method of the dehumidification solution process is as follows: in the off-peak period of cooling supply, the dilute solution return liquid enters the second solution dehumidification unit 28 through the eighth circulating water pump 42 and the twenty-first valve 40, is regenerated by heat absorption to become a concentrated solution, and is then supplied to the cold users 43 through the twenty-second valve 41; in the peak period of cooling supply, the dilute solution return liquid is divided into two paths at the outlet of the eighth circulating water pump 42, enters the first solution dehumidification unit 27 and the second solution dehumidification unit 28 respectively, is regenerated by heat absorption to become a concentrated solution, and is then supplied to the cold users 43 together.

[0023] The operation method of the flue gas process is as follows: only in the peak period of summer cooling supply, the gas direct-fired absorption cold water machine 31 is started, and the flue gas exhaust of the gas direct-fired absorption cold water machine 31 is cooled by heat release in the first solution dehumidification unit 27 through the fourteenth valve 25 and is then discharged to the atmosphere.

[0024] (II) Winter heating mode operation method

[0025] The operation method of the primary heat network process is as follows: the single-effect absorption cold and warm water machine 30 is switched to the heating mode; during the non-peak period of heat supply, when the primary heat network water supply can meet the heat load demand of the heat user, the primary heat network water supply from the heat source side enters the single-effect absorption cold and warm water machine 30 generator, the water-water heat exchanger 29 and the single-effect absorption cold and warm water machine 30 evaporator in sequence through the fifth valve 14, and finally returns to the primary heat network return water main; during the peak period of heat supply, when the primary heat network water supply cannot meet the heat load demand of the heat user, the gas direct-fired absorption cold and warm water machine 31 is started and switched to the heating mode, and the primary heat network water supply from the heat source side enters the single-effect absorption cold and warm water machine 30 generator, the water-water heat exchanger 29, the single-effect absorption cold and warm water machine 30 evaporator and the gas direct-fired absorption cold and warm water machine 31 evaporator in sequence, and finally returns to the primary heat network return water main.

[0026] The operation method of the secondary heat network process is as follows: during the non-peak period of heat supply, the secondary heat network return water enters the water-water heat exchanger 29 and the single-effect absorption cold and warm water machine 30 in two paths respectively, and after heat absorption and temperature rise, enters the secondary heat network water supply main together; during the peak period of heat supply, the gas direct-fired absorption cold and warm water machine 31 is started for peak shaving, the secondary heat network return water enters the water-water heat exchanger 29, the single-effect absorption cold and warm water machine 30, the gas direct-fired absorption cold and warm water machine 31 and the flue gas-water heat exchanger 32 in four paths respectively, and after heat absorption and temperature rise, enters the secondary heat network water supply main together.

[0027] The operation method of the flue gas process is as follows: only during the peak period of winter heat supply, the gas direct-fired absorption cold and warm water machine 31 is started, and at this time, the flue gas exhaust of the gas direct-fired absorption cold and warm water machine 31 is discharged to the atmosphere after heat release and temperature drop in the flue gas-water heat exchanger 32.

[0028] The beneficial effects of the present application are as follows:

[0029] 1. The pool-type low-temperature heat supply stack is provided with a hot water storage tank, which can not only realize flexible operation of the heat source side, but also can perform peak shaving, reduce the design installed capacity of the system and reduce the initial investment of the system.

[0030] 2. During the non-peak period of heat supply, the primary heat network water supply from the heat supply stack enters the single-effect absorption cold and warm water machine generator, the water-water heat exchanger and the single-effect absorption cold and warm water machine evaporator in sequence, and the return water temperature of the primary heat network main is reduced to about 25 DEG C; during the peak period of heat supply, the gas direct-fired absorption cold and warm water machine is started, and the gas direct-fired absorption cold and warm water machine can further reduce the hot water from the single-effect absorption cold and warm water machine evaporator from 25 DEG C to about 15 DEG C, thereby further improving the supply and return water temperature difference of the primary heat network and reducing the system transmission energy consumption.

[0031] 3. In cooling mode, the hot water temperature at the outlet of the single-effect absorption chiller generator can be reduced to 75-80℃, and the flue gas exhaust temperature of the gas direct-fired absorption chiller can reach 120-170℃. The low-temperature hot water and flue gas exhaust can be used to drive the solution dehumidification unit at the user energy station side, so that the return water temperature of the primary heating network can be reduced to 60-65℃, and the final exhaust temperature can be reduced to 75-80℃. The solution dehumidification unit, in combination with the single-effect absorption chiller and the gas direct-fired absorption chiller, can perform independent temperature and humidity control, which can not only increase the temperature difference between the supply water and return water of the primary heating network, but also increase the supply water temperature of the chilled water from 7℃ to 16-18℃, thereby improving the cooling energy efficiency ratio of the single-effect absorption chiller and the gas direct-fired absorption chiller, and achieving high-efficiency cooling. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 FIG. 1 is a schematic diagram of a large-temperature-difference pool-type heat supply and heat recovery system. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0034] As shown in the drawings, Figure 1 the large-temperature-difference pool-type heat supply and heat recovery system according to the present embodiment includes a heat source side composed of a pool-type low-temperature heat supply reactor 1, a first circulating water pump 2, a first heat exchanger 3, a second circulating water pump 4, a second heat exchanger 5, a third circulating water pump 6, a hot water storage tank 7, a first valve 8, a fourth circulating water pump 9, a second valve 10, a fifth circulating water pump 11, a third valve 12, a fourth valve 13, a fifth valve 14, a sixth valve 15, a seventh valve 16, an eighth valve 17, a ninth valve 18, a tenth valve 19, an eleventh valve 20, a twelfth valve 21, a thirteenth valve 22, a sixth circulating water pump 23, a cooling tower 24, a fourteenth valve 25, a fifteenth valve 26, a first solution dehumidification unit 27, a second solution dehumidification unit 28, a water-water heat exchanger 29, a single-effect absorption chiller 30, a gas direct-fired absorption chiller 31, a flue gas-water heat exchanger 32, a sixteenth valve 33, a seventeenth valve 34, an eighteenth valve 35, a seventh circulating water pump 36, a hot user 37, a nineteenth valve 38, a twentieth valve 39, a twenty-first valve 40, a twenty-second valve 41, an eighth circulating water pump 42, a cold user 43, a twenty-third valve 44, a twenty-fourth valve 45, a ninth circulating water pump 46, a twenty-fifth valve 47, a twenty-sixth valve 48, a twenty-seventh valve 49, a twenty-eighth valve 50, a twenty-ninth valve 51, a thirtieth valve 52, a thirty-first valve 53, and a user energy station side;

[0035] (1) The operation method of the heat source side is as follows:

[0036] Because the user side of the cold load and heat load has the characteristics of periodic variation, and the pool low-temperature heat supply reactor 1 cannot be adjusted frequently, but can be adjusted once every certain period of time, such as 12h, 24h, 36h, 48h, and the power adjustment depth and linear variable power rate are limited; when the heat load demand or cold load corresponding to the heat load demand of the user energy station side is less than the output power of the pool low-temperature heat supply reactor 1, the excess heat can be stored in the hot water storage tank 7. At this time, the first valve 8 and the third valve 11 are closed, and the second valve 10 and the fourth valve 13 are opened, and the primary heat supply water outlet of the third circulating water pump 6 enters the hot side inlet of the hot water storage tank 7 through the fourth valve 13 to store heat, and at the same time, the cold water of the same volume in the cold side outlet of the hot water storage tank 7 flows out of the hot water storage tank 7 through the fourth circulating water pump 9 and the second valve 10 in turn, and then flows to the cold side inlet of the second heat exchanger 5 to absorb heat and warm up; when the heat load demand or cold load corresponding to the heat load demand of the user energy station side is greater than the output power of the pool low-temperature heat supply reactor 1, and the heat stored in the hot water storage tank 7 can meet the load gap, the heat stored in the hot water storage tank 7 is released to the primary heat supply to meet the user demand. At this time, the second valve 10 and the fourth valve 13 are closed, and the first valve 8 and the third valve 11 are opened, and the hot water stored in the hot water storage tank 7 flows through the fifth circulating water pump 11 and the third valve 12 in turn, and then is combined with the primary heat supply water outlet of the third circulating water pump 6, and then is transported to the user energy station side to release heat, and performs heat supply or cold supply, and at the same time, the cold water of the same volume in the primary heat supply cold side return water flows into the cold side inlet of the hot water storage tank 7 through the first valve 8; when the heat load demand or cold load corresponding to the heat load demand of the user energy station side is greater than the output power of the pool low-temperature heat supply reactor 1, and the heat stored in the hot water storage tank 7 is released, the first valve 8, the second valve 10, the third valve 11 and the fourth valve 13 are closed, the pool low-temperature heat supply reactor 1 keeps full load operation, and the gas direct-fired absorption type cold water heater 31 of the user energy station side is started to perform heat supply or cold supply peak shaving.

[0037] (2) The user energy station side operation method includes a summer cooling mode operation method and a winter heating mode operation method;

[0038] a) Summer cooling mode

[0039] The operation method of the primary heat network process is: opening the fifth valve 14 and the seventh valve 16, closing the eighth valve 17 and the twenty-ninth valve 51, switching the single-effect absorption cold water machine 30 to the refrigeration mode, the primary heat network water from the heat source side enters the single-effect absorption cold water machine 30 generator through the fifth valve 14 to release heat and cool to 75℃, then enters the regenerator heat source side of the solution dehumidification unit 28 through the seventh valve 16 to release heat and cool to 60℃, and finally enters the primary heat network return water pipe through the sixth valve 15;

[0040] The operation method of the cooling water process is: during the off-peak period of summer cooling, when the primary heat network water can meet the cooling load demand of the cold user by driving the single-effect absorption cold water machine 30 and the second solution dehumidification unit 28, opening the tenth valve 19, the twelfth valve 21 and the thirteenth valve 22, closing the ninth valve 18, the eleventh valve 20, the fifteenth valve 26, the seventeenth valve 34 and the eighteenth valve 35, the cooling tower 24 cooling water supply enters the absorber and condenser of the single-effect absorption cold water machine 30 through the sixth circulating water pump 23, the thirteenth valve 22 and the tenth valve 19 to heat and rise in temperature, and then returns to the cooling tower 24 through the twelfth valve 21; during the peak period of summer cooling, when the primary heat network water cannot meet the cooling load demand of the cold user by driving the single-effect absorption cold water machine 30 and the second solution dehumidification unit 28, starting the gas direct-fired absorption cold water machine 31 for peak regulation, opening the tenth valve 19, the eleventh valve 20, the twelfth valve 21 and the thirteenth valve 22, closing the ninth valve 18, the fifteenth valve 26, the seventeenth valve 34 and the eighteenth valve 35, the cooling tower 24 cooling water supply is divided into two paths through the sixth circulating water pump 23 and the thirteenth valve 22, the first path enters the absorber and condenser of the single-effect absorption cold water machine 30 through the tenth valve 19, and the second path enters the absorber and condenser of the gas direct-fired absorption cold water machine 31 through the eleventh valve 20, the cooling water heated and risen in temperature by the single-effect absorption cold water machine 30 and the gas direct-fired absorption cold water machine 31 returns to the cooling tower 24 through the twelfth valve 21; during the off-peak period and the peak period of cooling, the supply / return water temperature of the cooling tower is 32 / 37℃.

[0041] The operation method of the chilled water process is as follows: in the off-peak period of summer cooling, the twenty-fourth valve 45 and the twenty-fifth valve 47 are opened, and the twenty-third valve 44, the twenty-sixth valve 48, the twenty-eighth valve 50, the thirtieth valve 52 and the thirty-first valve 53 are closed. The chilled water return water enters the evaporator of the single-effect absorption cold water heater 30 in sequence through the ninth circulating water pump 46 and the twenty-fourth valve 45, and is then supplied to the dry fan coil of the cold user 43 through the twenty-fifth valve 47; in the peak period of summer cooling, the gas direct-fired absorption cold water heater 31 is started to perform peak regulation, the twenty-fourth valve 45, the twenty-fifth valve 47, the thirtieth valve 52 and the thirty-first valve 53 are opened, and the twenty-third valve 44 and the twenty-sixth valve 48 are closed. The chilled water return water is divided into two paths by the ninth circulating water pump 46. The first path enters the evaporator of the single-effect absorption cold water heater 30 through the twenty-fourth valve 45, and the second path enters the evaporator of the gas direct-fired absorption cold water heater 31 through the thirtieth valve 52. The chilled water after heat release and cooling is supplied to the dry fan coil of the cold user 43 through the twenty-fifth valve 47 and the thirty-first valve 53 respectively; in the off-peak period and the peak period of cooling, the supply / return water temperature of the chilled water is 18 / 21℃, which improves the evaporation temperature of the single-effect absorption cold water heater 30 and the gas direct-fired absorption cold water heater 31, and improves the refrigeration energy efficiency ratio.

[0042] The operation method of the dehumidification solution process is as follows: in the off-peak period of summer cooling, the twenty-first valve 40 and the twenty-second valve 41 are opened, and the nineteenth valve 38 and the twentieth valve 39 are closed. The dilute solution return liquid enters the regenerator solution side of the second solution dehumidification unit 28 through the eighth circulating water pump 42 and the twenty-first valve 40, and becomes concentrated solution after heat absorption and regeneration, and is then supplied to the fresh air unit of the cold user 43 through the twenty-second valve 41; in the peak period of summer cooling, the nineteenth valve 38, the twentieth valve 39, the twenty-first valve 40 and the twenty-second valve 41 are opened. The dilute solution return liquid is divided into two paths by the eighth circulating water pump 42. The first path enters the regenerator solution side of the first solution dehumidification unit 27 through the nineteenth valve 38, and the second path enters the regenerator solution side of the second solution dehumidification unit 28 through the twenty-first valve 40. The concentrated solution is obtained after heat absorption and regeneration, and is then supplied to the fresh air unit of the cold user 43 through the twentieth valve 39 and the twenty-second valve 41 respectively; the regeneration temperature of the lithium chloride solution is 55℃.

[0043] The operation method of the flue gas process is as follows: only in the peak period of summer cooling, the gas direct-fired absorption type cold and warm water machine 31 is started, the sixteenth valve 33 is closed, the fourteenth valve 25 is opened, the flue gas of the gas direct-fired absorption type cold and warm water machine 31 is discharged into the first solution dehumidification unit 27 regenerator heat source side through the sixteenth valve 33, and is discharged to the atmosphere after heat release and cooling; the temperature of the inlet / outlet flue gas of the first solution dehumidification unit 27 regenerator heat source side is 170 / 60 ℃, and the deep utilization of flue gas waste heat is realized.

[0044] b) Winter heating mode

[0045] The operation method of the primary heat network process is as follows: in the off-peak period of winter heating, when the primary heat network water supply can meet the heat load demand of the heat user, the fifth valve 14, the eighth valve 17, the twenty-third valve 44, the twenty-sixth valve 48, the twenty-eighth valve 50, the twenty-ninth valve 51 are opened, the seventh valve 16, the twenty-fourth valve 45, the twenty-fifth valve 47, the twenty-seventh valve 49, the thirtieth valve 52, the thirty-first valve 53 are closed, the single-effect absorption type cold and warm water machine 30 is switched to the heating mode, the primary heat network water supply from the heat source side enters the single-effect absorption type cold and warm water machine 30 generator in sequence through the fifth valve 14, releases heat and cools down, then enters the water-water heat exchanger 29 hot side through the eighth valve 17, releases heat and cools down, then enters the single-effect absorption type cold and warm water machine 30 evaporator through the twenty-third valve 44, releases heat and cools down, and finally returns to the primary heat network return water main through the twenty-sixth valve 48, the twenty-eighth valve 50 and the twenty-ninth valve 51; finally, the temperature of the primary heat network water supply is reduced from 90 ℃ to 25 ℃; in the peak period of winter heating, when the primary heat network water supply cannot meet the heat load demand of the heat user, the fifth valve 14, the eighth valve 17, the twenty-third valve 44, the twenty-sixth valve 48, the twenty-seventh valve 49, the twenty-ninth valve 51 are opened, the seventh valve 16, the twenty-fourth valve 45, the twenty-fifth valve 47, the twenty-eighth valve 50, the thirtieth valve 52, the thirty-first valve 53 are closed, the gas direct-fired absorption type cold and warm water machine 31 is started and switched to the heating mode, the primary heat network water supply from the heat source side enters the single-effect absorption type cold and warm water machine 30 generator in sequence through the fifth valve 14, releases heat and cools down, then enters the water-water heat exchanger 29 hot side through the eighth valve 17, releases heat and cools down, then enters the single-effect absorption type cold and warm water machine 30 evaporator through the twenty-third valve 44, releases heat and cools down, then enters the gas direct-fired absorption type cold and warm water machine 31 evaporator through the valve 49 for further cooling, and finally returns to the primary heat network return water main through the twenty-ninth valve 51; finally, the temperature of the primary heat network water supply is reduced from 90 ℃ to 15 ℃, and the deep utilization of the primary heat network water supply is realized.

[0046] The operation method of the secondary heat network process is as follows: in the off-peak period of winter heating, the ninth valve 18, the tenth valve 19, the seventeenth valve 34 and the eighteenth valve 35 are opened, and the eleventh valve 20, the twelfth valve 21, the thirteenth valve 22 and the fifteenth valve 26 are closed. The secondary heat network return water is divided into two routes by the seventh circulating water pump 36 and the eighteenth valve 35. The first route enters the cold side of the water-water heat exchanger 29 through the ninth valve 18, and the second route enters the absorber and the condenser of the single-effect absorption cold water heater 30 through the tenth valve 19. The secondary heat network supply water after heat absorption and temperature rise is supplied to the heat user 37 through the seventeenth valve 34; in the peak period of winter heating, the gas direct-fired absorption cold water heater 31 is started to perform peak regulation, the ninth valve 18, the tenth valve 19, the eleventh valve 20, the fifteenth valve 26, the seventeenth valve 34 and the eighteenth valve 35 are opened, and the twelfth valve 21 and the thirteenth valve 22 are closed. The secondary heat network return water is divided into four routes by the seventh circulating water pump 36 and the eighteenth valve 35. The first route enters the cold side of the water-water heat exchanger 29 through the ninth valve 18, the second route enters the absorber and the condenser of the single-effect absorption cold water heater 30 through the tenth valve 19, the third route enters the absorber and the condenser of the gas direct-fired absorption cold water heater 31 through the eleventh valve 20, and the fourth route enters the flue gas-water heat exchanger 32 through the fifteenth valve 26. The secondary heat network supply water after heat absorption and temperature rise is supplied to the heat user 37 through the seventeenth valve 34. The supply and return water temperature of the secondary heat network is 60 / 45℃.

[0047] The operation method of the flue gas process is as follows: only in the peak period of winter heating, the gas direct-fired absorption cold water heater 31 is started, at this time the fourteenth valve 25 is closed and the sixteenth valve 33 is opened. The exhaust gas of the gas direct-fired absorption cold water heater 31 is discharged to the atmosphere after heat release and temperature reduction in the flue gas-water heat exchanger 32 through the sixteenth valve 33. The inlet and outlet flue gas temperature of the flue gas-water heat exchanger 32 is 170 / 70℃, which realizes the deep utilization of flue gas waste heat.

Claims

1. A large temperature difference cell type heat supply reactor combined cooling and heating system, characterized in that, The heat source side is composed of a pool type low temperature heat supply reactor (1), a first circulating water pump (2), a first heat exchanger (3), a second circulating water pump (4), a second heat exchanger (5), a third circulating water pump (6), a hot water storage tank (7), a first valve (8), a fourth circulating water pump (9), a second valve (10), a fifth circulating water pump (11), a third valve (12), a fourth valve (13), a fifth valve (14), a sixth valve (15), a seventh valve (16), an eighth valve (17), a ninth valve (18), a tenth valve (19), an eleventh valve (20), a twelfth valve (21), a thirteenth valve (22), a sixth circulating water pump (23), a cooling tower (24), a fourteenth valve (25), a fifteenth valve (26), a first solution dehumidification unit (27), a second solution dehumidification unit (28), a water-water heat exchanger (29), a single-effect absorption cold and warm water machine (30), a gas direct-fired absorption cold and warm water machine (31), a flue gas-water heat exchanger (32), a sixteenth valve (33), a seventeenth valve (34), an eighteenth valve (35), a seventh circulating water pump (36), a heat user (37), a nineteenth valve (38), a twentieth valve (39), a twenty-first valve (40), a twenty-second valve (41), an eighth circulating water pump (42), a cold user (43), a twenty-third valve (44), a twenty-fourth valve (45), a ninth circulating water pump (46), a twenty-fifth valve (47), a twenty-sixth valve (48), a twenty-seventh valve (49), a twenty-eighth valve (50), a twenty-ninth valve (51), a thirtieth valve (52), a thirty-first valve (53); The user energy station side is composed of a sixth valve (15), a seventh valve (16), an eighth valve (17), a ninth valve (18), a tenth valve (19), an eleventh valve (20), a twelfth valve (21), a thirteenth valve (22), a sixth circulating water pump (23), a cooling tower (24), a fourteenth valve (25), a fifteenth valve (26), a first solution dehumidification unit (27), a second solution dehumidification unit (28), a water-water heat exchanger (29), a single-effect absorption cold and warm water machine (30), a gas direct-fired absorption cold and warm water machine (31), a flue gas-water heat exchanger (32), a sixteenth valve (33), a seventeenth valve (34), an eighteenth valve (35), a seventh circulating water pump (36), a heat user (37), a nineteenth valve (38), a twentieth valve (39), a twenty-first valve (40), a twenty-second valve (41), an eighth circulating water pump (42), a cold user (43), a twenty-third valve (44), a twenty-fourth valve (45), a ninth circulating water pump (46), a twenty-fifth valve (47), a twenty-sixth valve (48), a twenty-seventh valve (49), a twenty-eighth valve (50), a twenty-ninth valve (51), a thirtieth valve (52), a thirty-first valve (53). The specific connection relationship is that the one-way water supply of the pool type low temperature heat supply reactor (1) is connected in sequence with the first circulating water pump (2), the hot side inlet of the first heat exchanger (3) in communication through the connecting pipe, the heat is transmitted to the two-way circuit, the cold side outlet of the first heat exchanger (3) is connected in sequence with the second circulating water pump (4), the hot side inlet of the second heat exchanger (5) in communication through the connecting pipe, the heat is transmitted to the primary heat network, the cold side outlet of the second heat exchanger (5) is connected in communication with the third circulating water pump (6) through the connecting pipe; the outlet of the third circulating water pump (6) is divided into two ways, the first way is connected in sequence with the fourth valve (13), the hot side inlet of the hot water heat storage tank (7) in communication through the connecting pipe; the second way is connected in sequence with the fifth valve (14), the generator inlet of the single-effect absorption type cold and warm water machine (30) in communication through the connecting pipe; the generator outlet of the single-effect absorption type cold and warm water machine (30) is divided into two ways, the first way is connected in sequence with the seventh valve (16), the regenerator heat source side inlet of the second solution dehumidification unit (28) in communication through the connecting pipe; the second way is connected in sequence with the eighth valve (17), the hot side inlet of the water-water heat exchanger (29) in communication through the connecting pipe; the hot side outlet of the water-water heat exchanger (29) is connected in sequence with the twenty-third valve (44), the evaporator inlet of the single-effect absorption type cold and warm water machine (30) in communication through the connecting pipe; the evaporator outlet of the single-effect absorption type cold and warm water machine (30) is connected in communication with the twenty-sixth valve (48), the outlet of the twenty-sixth valve (48) is divided into two ways, the first way is connected in sequence with the twenty-seventh valve (49), the evaporator inlet of the gas direct-fired absorption type cold and warm water machine (31) in communication through the connecting pipe; the second way is connected in communication with the twenty-eighth valve (50), the twenty-ninth valve (51); the evaporator outlet of the gas direct-fired absorption type cold and warm water machine (31) is connected in communication with the twenty-ninth valve (51); the outlet of the twenty-ninth valve (51), the regenerator heat source side outlet of the second solution dehumidification unit (28) are all connected in communication with the sixth valve (15) of the primary heat network backwater main; the outlet of the sixth valve (15) is divided into two ways, the first way is connected in sequence with the first valve (8), the cold side inlet of the hot water heat storage tank (7) in communication through the connecting pipe; the second way is connected in communication with the cold side inlet of the second heat exchanger (5) through the connecting pipe; the cold side outlet of the hot water heat storage tank (7) is connected in sequence with the second valve (10) and the cold side inlet of the second heat exchanger (5) through the fourth circulating water pump (9); the hot side outlet of the hot water heat storage tank (7) is connected in sequence with the fifth circulating water pump (11), the third valve (12), the fifth valve (14) and the generator inlet of the single-effect absorption type cold and warm water machine (30) in communication through the connecting pipe; The chilled water return from the cold user (43) is connected to the ninth circulating water pump (46) through a connecting pipe. The outlet of the ninth circulating water pump (46) is divided into two paths. The first path is connected to the second twenty-fourth valve (45) and the evaporator inlet of the single-effect absorption cold water heater (30) through connecting pipes in sequence. The second path is connected to the third-thirtieth valve (52), the second twenty-seventh valve (49), and the evaporator inlet of the gas direct-fired absorption cold water heater (31) through connecting pipes in sequence. The evaporator outlet of the single-effect absorption cold water heater (30) and the evaporator outlet of the gas direct-fired absorption cold water heater (31) are connected to the chilled water supply main through the second twenty-fifth valve (47) and the third-thirty-first valve (53), respectively. The dilute solution return from the fresh air unit of the cold user (43) is connected to the eighth circulating water pump (42) through a connecting pipe. The outlet of the eighth circulating water pump (42) is divided into two paths. The first path is connected to the nineteenth valve (38) and the regenerator solution side inlet of the first solution dehumidification unit (27) through connecting pipes in sequence. The regenerator solution side outlet of the first solution dehumidification unit (27) is connected to the concentrated solution supply liquid main through a connecting pipe and the twentieth valve (39). The second path is connected to the twenty-first valve (40) and the regenerator solution side inlet of the second solution dehumidification unit (28) through connecting pipes in sequence. The regenerator solution side outlet of the second solution dehumidification unit (28) is connected to the concentrated solution supply liquid main through a connecting pipe and the twenty-second valve (41). The secondary heat network return water returned from the heat user (37) is connected in sequence through the connecting pipe, the seventh circulating water pump (36), the eighteenth valve (35), and the common node between the thirteenth valve (22) and the eighteenth valve (35); the cooling water supply of the cooling tower (24) is connected in sequence through the connecting pipe, the sixth circulating water pump (23), the thirteenth valve (22), and the common node between the thirteenth valve (22) and the eighteenth valve (35); the common node between the thirteenth valve (22) and the eighteenth valve (35) is connected to the ninth valve (18), the tenth valve (19), the eleventh valve (20), and the fifteenth valve (26) in four ways; the outlet of the ninth valve (18) is connected in sequence through the connecting pipe to the cold side of the water-water heat exchanger (29), the common node between the twelfth valve (21) and the seventeenth valve (34); the outlet of the tenth valve (19) is connected in sequence through the connecting pipe to the absorber and condenser of the single-effect absorption cold and warm water machine (30), the common node between the twelfth valve (21) and the seventeenth valve (34); the outlet of the eleventh valve (20) is connected in sequence through the connecting pipe to the absorber and condenser of the gas direct-fired absorption cold and warm water machine (31), the common node between the twelfth valve (21) and the seventeenth valve (34); the outlet of the fifteenth valve (26) is connected in sequence through the connecting pipe to the cold side of the flue gas-water heat exchanger (32), the common node between the twelfth valve (21) and the seventeenth valve (34); the common node between the twelfth valve (21) and the seventeenth valve (34) is connected in two ways, the first way is connected in sequence through the connecting pipe to the seventeenth valve (34) and the heat user (37); the second way is connected in sequence through the connecting pipe to the twelfth valve (21) and the cooling tower (24).

2. The large temperature difference cell type heat supply and heat consumption system according to claim 1, characterized in that, The working medium of the single-effect absorption cold and warm water machine (30) and the gas direct-fired absorption cold and warm water machine (31) is lithium bromide solution; the working medium of the first solution dehumidification unit (27) and the second solution dehumidification unit (28) is lithium chloride solution; the regenerator of the first solution dehumidification unit (27) is driven by the flue gas exhaust of the gas direct-fired absorption cold and warm water machine (31), and the regenerator of the second solution dehumidification unit (28) is driven by the low-temperature hot water of the primary heat network after the generator of the single-effect absorption cold and warm water machine (30) is cooled.

3. The operation method of the large temperature difference cell type heat supply reactor combined cooling, heating and power system according to claim 1 or 2, characterized in that, The method comprises a heat source side operation method and a user energy station side operation method; The heat source side operation method is that when the heat load demand or cold load demand of the user side is low and the output heat of the pool type low temperature heat supply reactor 1 is still surplus after meeting the user demand, part of the primary heat supply water at the outlet of the third circulating water pump (6) enters the hot water storage tank (7) through the fourth valve (13) to store heat; at the same time, the cold water of the same volume at the cold side outlet of the hot water storage tank (7) flows out of the hot water storage tank (7) in turn through the fourth circulating water pump (9) and the second valve (10), and then flows to the cold side inlet of the second heat exchanger (5); when the heat load demand or cold load demand of the user side is high and the output heat of the pool type low temperature heat supply reactor (1) cannot meet the user demand, the hot water stored in the hot water storage tank (7) flows in turn through the fifth circulating water pump (11) and the third valve (12) and merges with the primary heat supply water at the outlet of the third circulating water pump (6), and then is transported to the user energy station side together; at the same time, the cold water of the same volume at the cold side return of the primary heat supply enters the cold side inlet of the hot water storage tank (7) through the first valve (8); when the pool type low temperature heat supply reactor (1) cannot meet the heat load demand or cold load demand of the user side under full load operation, and the heat stored in the hot water storage tank (7) is released, the pool type low temperature heat supply reactor (1) keeps full load operation to transport all the output heat to the user side, and the gas direct-fired absorption type cold and warm water machine (31) of the user energy station side is started to perform peak shaving; The user energy station side operation method includes a summer cooling mode operation method and a winter heating mode operation method; (1) Summer cooling mode operation method The operation method of the primary heat supply water process flow is that the single-effect absorption type cold and warm water machine (30) is switched to the refrigeration mode, the primary heat supply water from the heat source side enters the generator of the single-effect absorption type cold and warm water machine (30) to release heat and cool down, and then further releases heat in the regenerator heat source side of the solution dehumidification unit (28), and finally returns to the heat source side through the sixth valve (15); The operation method of the cooling water process flow is that in the cooling non-peak period, when the primary heat supply water of the single-effect absorption type cold and warm water machine (30) and the second solution dehumidification unit (28) can meet the cold load demand of the cold user, the cooling water supply of the cooling tower (24) enters the absorber and condenser of the single-effect absorption type cold and warm water machine (30) to heat up after being heated by the sixth circulating water pump (23), the thirteenth valve (22) and the tenth valve (19), and then returns to the cooling tower (24); in the cooling peak period, when the single-effect absorption type cold and warm water machine (30) and the second solution dehumidification unit (28) cannot meet the cold load demand of the cold user, the gas direct-fired absorption type cold and warm water machine (31) is started to perform peak shaving; At this time, the cooling water supply of the cooling tower (24) is divided into two paths and enters the single-effect absorption type cold and warm water machine (30) and the gas direct-fired absorption type cold and warm water machine (31) to heat up. The operation method of the chilled water process flow is as follows: in the off-peak period of cooling supply, the chilled water return water sequentially passes through the ninth circulating water pump (46) and the twenty-fourth valve (45) into the single-effect absorption type cold and warm water machine (30) evaporator to release heat and reduce temperature, and then is supplied to the cold user (43) through the twenty-fifth valve (47); in the peak period of cooling supply, the gas direct-fired absorption type cold and warm water machine (31) is started to perform peak regulation, and the chilled water return water enters the single-effect absorption type cold and warm water machine (30) evaporator and the gas direct-fired absorption type cold and warm water machine (31) evaporator to release heat and reduce temperature, and then is supplied to the cold user (43) together; The operation method of the dehumidification solution process flow is as follows: in the off-peak period of cooling supply, the dilute solution return liquid sequentially passes through the eighth circulating water pump (42) and the twenty-first valve (40) into the second solution dehumidification unit (28), is regenerated by heat absorption to become a concentrated solution, and then is supplied to the cold user (43) through the twenty-second valve (41); in the peak period of cooling supply, the dilute solution return liquid is divided into two paths at the outlet of the eighth circulating water pump (42), enters the first solution dehumidification unit (27) and the second solution dehumidification unit (28) respectively, is regenerated by heat absorption to become a concentrated solution, and then is supplied to the cold user (43) together; The operation method of the flue gas process flow is as follows: only in the peak period of summer cooling supply, the gas direct-fired absorption type cold and warm water machine (31) is started, and the flue gas of the gas direct-fired absorption type cold and warm water machine (31) is discharged to the atmosphere after releasing heat and reducing temperature in the first solution dehumidification unit (27) through the fourteenth valve 25; (2) Winter heating mode operation method The operation method of the primary heat network process flow is as follows: the single-effect absorption type cold and warm water machine (30) is switched to the heating mode; in the off-peak period of heating supply, when the primary heat network water supply from the heat source side can meet the heat load demand of the heat user, the primary heat network water supply from the heat source side sequentially enters the single-effect absorption type cold and warm water machine (30) generator, the water-water heat exchanger (29) and the single-effect absorption type cold and warm water machine (30) evaporator through the fifth valve (14), and finally returns to the primary heat network return water main; in the peak period of heating supply, when the primary heat network water supply cannot meet the heat load demand of the heat user, the gas direct-fired absorption type cold and warm water machine (31) is started and switched to the heating mode, and the primary heat network water supply from the heat source side sequentially enters the single-effect absorption type cold and warm water machine (30) generator, the water-water heat exchanger (29), the single-effect absorption type cold and warm water machine (30) evaporator and the gas direct-fired absorption type cold and warm water machine (31) evaporator, and finally returns to the primary heat network return water main; The operation method of the secondary heat network process flow is as follows: in the off-peak period of heating supply, the secondary heat network return water is divided into two paths and enters the water-water heat exchanger (29) and the single-effect absorption type cold and warm water machine (30) respectively, is heated and heated together to enter the secondary heat network water supply main; in the peak period of heating supply, the gas direct-fired absorption type cold and warm water machine (31) is started to perform peak regulation, and at this time, the secondary heat network return water is divided into four paths and enters the water-water heat exchanger (29), the single-effect absorption type cold and warm water machine (30), the gas direct-fired absorption type cold and warm water machine (31) and the flue gas-water heat exchanger (32) respectively, is heated and heated together to enter the secondary heat network water supply main; The operation method of the flue gas process is as follows: only during the peak period of heat supply, the gas direct-fired absorption type cold and warm water machine (31) is started, at this time, the flue gas of the gas direct-fired absorption type cold and warm water machine (31) is discharged to the atmosphere after heat release and temperature reduction in the flue gas-water heat exchanger (32) through the sixteenth valve (33).

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