Cold and heat combined supply system based on deep utilization of steam condensate water waste heat

Abstract

The application discloses a cold-heat combined supply system based on steam condensate water waste heat deep utilization, which comprises a waste heat recovery unit, a cold-heat combined supply unit, a condensate water tank and a steam utilization unit; the cold-heat combined supply unit comprises a cooling unit, a first heat supply unit, a second heat supply unit and a third heat supply unit; the cooling unit is a hot water type absorption water chiller, the first heat supply unit comprises a primary heat exchanger, the second heat supply unit comprises a secondary heat exchanger and a heat preservation water tank, and the third heat supply unit is an air conditioning heating unit. The application converts part of the sensible heat of the recycled high-temperature steam condensate water into latent heat by using a flash tank, realizes the reuse of the high-temperature steam condensate water, and makes the steam condensate water after flashing enter the condensate water tank, so that the generation of secondary steam can be avoided. The application realizes the step-by-step recycling of the steam condensate water waste heat by using the primary heat exchanger, the secondary heat exchanger and the water source heat pump unit, realizes the resource utilization of the steam condensate water, and improves the waste heat utilization rate of the steam condensate water.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of steam condensate waste heat recovery, in particular to a cold-heat combined supply system based on steam condensate waste heat deep utilization. BACKGROUND

[0002] Steam can effectively transfer heat due to its high heat capacity, and is commonly used as an important energy carrier in industry, commerce and daily life, such as heating, drying, driving and heating. The heat energy of steam consists of sensible heat and latent heat. In the process of indirect heating of steam, the heating equipment usually only utilizes the latent heat and a small amount of sensible heat of steam. The steam releases latent heat and a small amount of sensible heat, and is reduced to high-temperature condensate water. Such high-temperature condensate water has a high temperature and excellent water quality, close to the desalination water standard, and almost no dissolved oxygen and carbon dioxide gas. The heat energy value of the high-temperature condensate water is about 25% of the heat energy value of steam.

[0003] At present, the recovery of high-temperature condensate water in the steam supply system is generally through open water tank (tank) or water tank cooling and then returning to the boiler room, or used as a low-temperature heat source for heat exchange, or used as other water supply. During the cooling of the high-temperature condensate water, the flash steam takes away 5% to 15% of the condensate water and the heat equivalent to 30% to 80% of the condensate water. The sensible heat contained in the condensate water is not fully utilized, and a large amount of heat is wasted. The emission of secondary steam also causes thermal pollution and noise pollution to the environment, and the direct discharge of condensate water also causes loss of water resources. In addition, because the condensate water is in contact with the atmosphere again, oxygen, carbon dioxide and other gases are re-dissolved, which will cause corrosion of equipment and pipelines, and adversely affect the stability and durability of the entire steam heating system. In the long-term operation process, it may cause a series of problems such as increased equipment maintenance cost, increased pipeline leakage risk and reduced system operation efficiency. Therefore, it is very important to improve the utilization rate of high-temperature steam condensate water heat in the steam supply system. SUMMARY

[0004] Therefore, the present application provides a cold-heat combined supply system based on steam condensate waste heat deep utilization.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] The cold-heat combined supply system based on steam condensate water waste heat deep utilization, comprising a waste heat recovery unit and a cold-heat combined supply unit, further comprising a condensate water tank for storing high-temperature condensate water and a steam utilization unit; the waste heat recovery unit comprises a flash tank connected with a recovery pipeline, the steam utilization unit comprises a water vapor compressor, the steam port of the flash tank is connected with a steam user through a steam pipeline, and the water vapor compressor is arranged on the steam pipeline; the cold-heat combined supply unit comprises a cold supply unit, a first heat supply unit, a second heat supply unit and a third heat supply unit;

[0007] A condensate water pump is arranged on the water supply main pipeline of the condensate water tank, a first branch and a second branch are connected with the water supply main pipeline, the cold supply unit has a hot water type absorption water chiller, the water inlet of the hot water side of the hot water type absorption water chiller is connected with the first branch through a first pipeline, the water outlet of the hot water side is connected with the second branch through a second pipeline, and a first valve is arranged on the first pipeline; a eleventh valve is arranged on the second branch on the upstream side of the second pipeline.

[0008] The first heat supply unit comprises a primary heat exchanger, the water inlet of the heat source side of the primary heat exchanger is connected with the first branch through a third pipeline, and a second valve is arranged on the third pipeline; the water outlet of the heat source side of the primary heat exchanger is connected with the second branch through a fourth pipeline.

[0009] The second heat supply unit is a domestic hot water unit, which comprises a secondary heat exchanger and a heat preservation water tank, the water inlet of the hot water side of the secondary heat exchanger is connected with the second branch through a fifth pipeline, the water outlet is connected with a third branch through a sixth pipeline, a seventh valve is arranged on the fifth pipeline, and an eighth valve is arranged on the third branch between the fifth pipeline and the sixth pipeline; a hot water heating circulation loop is formed through the pipeline connection between the secondary heat exchanger and the heat preservation water tank, and a hot water circulating pump is arranged on the hot water heating circulation loop.

[0010] The third heat supply unit is an air conditioning heating unit, which comprises a water source heat pump unit, the water source heat pump unit and an air conditioning heating end form an air conditioning heating loop through a pipeline, and an air conditioning heating circulating pump is arranged on the air conditioning heating loop; the water inlet of the water source side of the water source heat pump unit is connected with the third branch through a seventh pipeline, the water outlet is connected with the third branch through an eighth pipeline, a ninth valve is arranged on the seventh pipeline, and a tenth valve is arranged on the third branch between the seventh pipeline and the eighth pipeline.

[0011] The beneficial effects are: the present application converts part of the sensible heat of the recovered high-temperature steam condensate water into latent heat by using a flash tank, and the condensed steam can be reused after being pressurized; the condensate tank is a closed tank, and the condensed steam after flash evaporation enters the condensate tank, which can avoid the generation of secondary steam; the present application realizes the step-by-step recycling of steam condensate water waste heat by using a primary heat exchanger, a secondary heat exchanger and a water source heat pump unit, realizes the resource utilization of steam condensate water, and improves the utilization rate of steam waste heat.

[0012] The cold-heat combined unit of the present application can be used for steam, heating, air conditioning, refrigeration and domestic hot water, which widens the utilization space of steam condensate water waste heat, realizes the waste heat recycling and low-temperature discharge of steam condensate water in the whole operation cycle, improves the sustainability and continuity of the system, and helps to reduce enterprise energy cost and environmental impact. In actual operation, the cold and heat load demand time is completely consistent with the steam condensate water generation time, which ensures the reliability and stability of the system operation.

[0013] Preferably, the chilled water type absorption water chiller of the cold supply unit and the cold end are connected through a chilled water supply pipe and a chilled water return pipe to form a chilled water circulation loop, and a cold circulation pump is arranged on the chilled water return pipe; the cold-heat combined unit further comprises an air source heat pump unit, the first interface of the air source heat pump unit is provided with a first branch pipe and a second branch pipe, the first branch pipe is connected with the hot water outlet of the water source heat pump unit, and the second branch pipe is connected with the water outlet of the cold end of the chilled water type absorption water chiller; a sixth valve is arranged on the first branch pipe, and a fourth valve is arranged on the second branch pipe; the second interface of the air source heat pump unit is provided with a third branch pipe and a fourth branch pipe, the other end of the third branch pipe is connected with the chilled water return pipe, and the other end of the fourth branch pipe is connected with the water return port of the water source heat pump unit; a third valve is arranged on the third branch pipe, and a fifth valve is arranged on the fourth branch pipe.

[0014] The beneficial effects are: the air source heat pump has a refrigeration mode and a heating mode, which can be used for cold supplement and heat supplement, and ensures the stability and reliability of the whole system.

[0015] Preferably, the heat preservation water tank is connected with the domestic hot water user end through a hot water supply pipeline, the return water of the domestic hot water user is connected with the heat preservation water tank, and a hot water supply pump is arranged on the hot water supply pipeline.

[0016] More preferably, the first heat supply unit is radiator heating, the primary heat exchanger and the radiator heating end form a heating circulation loop through a heating hot water supply pipe and a heating hot water return pipe, a heating circulation pump is arranged on the heating hot water return pipe, and the heating circulation pump is at least one group.

[0017] The beneficial effects are: the present application utilizes the flash tank to convert part of the sensible heat of the recovered high-temperature steam condensate water into latent heat, which can be reused after being pressurized, realizing the reuse of the flash steam; the condensate tank is a closed tank, and the steam condensate water after flashing enters the condensate tank, which can avoid the generation of secondary steam; the present application utilizes the primary heat exchanger, the secondary heat exchanger and the water source heat pump unit to realize the step-by-step recycling of the steam condensate water waste heat, realizes the resource utilization of the steam condensate water, and improves the utilization rate of the steam waste heat.

[0018] The cold-heat combined supply unit of the present application can be used for steam, heating, air-conditioning heat, refrigeration and domestic hot water, which widens the utilization space of the steam condensate water waste heat, realizes the waste heat recycling and low-temperature discharge of the steam condensate water in the whole operation cycle, improves the sustainability and continuity of the system, and helps to reduce the energy cost of enterprises and reduce the environmental impact. In actual operation, the cold and heat load demand time and the steam condensate water generation time are completely consistent, which ensures the reliability and stability of the system operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the system diagram of the present application. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, and the embodiments are implemented on the premise of the technical scheme of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0021] It should be noted that, in the description of the present application, the relationship terms such as "first", "second" and the like are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

[0022] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" that may appear should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] The present application provides a cold-heat combined supply system based on deep utilization of steam condensate water waste heat, which comprises a waste heat recovery unit and a cold-heat combined supply unit, and further comprises a condensate tank 3 for storing high-temperature condensate water and a steam utilization unit. Figure 1It can be seen that the waste heat recovery unit comprises a flash tank 1 connected with a recovery pipeline, high-temperature condensed water in the water vapor supply system enters the flash tank 1 through the recovery pipeline;

[0024] The steam utilization unit comprises a water vapor compressor 2, the steam port of the flash tank 1 is connected with a steam user through a steam pipeline, the water vapor compressor 2 is arranged on the steam pipeline, the flash tank 1 makes part of the high-temperature condensed water into low-pressure saturated water vapor, and then the low-pressure saturated water vapor is pressurized by the water vapor compressor 2 to become high-pressure water vapor with a certain pressure (generally 0.5 MPa, and the pressure can be pressurized according to actual requirements), so as to realize reutilization; the high-temperature condensed water (with a temperature of about 90-120 DEG C) after being flashed by the flash tank 1 enters a condensed water tank 3 (a closed water tank is adopted), so that generation of secondary steam is avoided, and stability and reliability of the system are ensured; a water supply main pipeline is arranged at the water outlet of the condensed water tank 3, and a condensed water pump 4 (the condensed water pump 4 provides water supply power, and one standby one use is adopted) is arranged on the water supply main pipeline to provide high-temperature hot water for the cold-heat combined unit, so as to ensure stable operation of the cold-heat combined unit;

[0025] The cold-heat combined unit comprises a cooling unit, a first heating unit (a radiator heating unit), a second heating unit (a domestic hot water unit) and a third heating unit (an air conditioning heating unit); the water supply main pipeline is connected with a first branch L1 and a second branch L2, the cooling unit comprises a hot water type absorption water chiller 5 (a hot water type lithium bromide absorption water chiller can be adopted), the water inlet of the hot water side of the hot water type absorption water chiller 5 is connected with the first branch L1 through a first pipeline L4, the water outlet of the hot water side of the hot water type absorption water chiller 5 is connected with the second branch L2 through a second pipeline L5, the first pipeline L4 is provided with a first valve F1, and the second branch L2 on the upstream side of the second pipeline L5 is provided with an eleventh valve F11; a chilled water circulation loop is formed between the cooling side of the hot water type absorption water chiller 5 and a cooling end through a chilled water supply pipeline and a chilled water return pipeline, and the chilled water return pipeline is provided with a cooling circulation pump 10 (one standby one use is preferred); the high-temperature condensed water is cooled from 90-120 DEG C to 70 DEG C after entering the hot water tank absorption water chiller, so that the high-temperature condensed water is utilized at a first level; the hot water type absorption water chiller provides 7 DEG C cooling water for the cooling end, and the return water of the cooling end is 12 DEG C;

[0026] The first heat supply unit is a radiator heating unit, which comprises a primary heat exchanger 6, the primary heat exchanger 6 and the radiator heating end form a heating circulation loop through a heating hot water supply pipe and a heating hot water return pipe, and a heating circulation pump 11 (preferably one standby and one in use) is arranged on the heating hot water return pipe; the water inlet on the heat source side of the primary heat exchanger 6 is connected with the first branch L1 through a third pipeline, and a second valve F2 is arranged on the third pipeline; the water outlet on the heat source side of the primary heat exchanger 6 is connected with the second branch L2 through a fourth pipeline, and high-temperature condensed water (90-120℃) enters the primary heat exchanger 6 under the action of the condensed water pump 4, and the heat is transferred to the heating circulation loop through the primary heat exchanger 6, and the temperature is reduced to 70℃ after heat exchange, realizing the first utilization of high-temperature condensed water; the supply water temperature of the heating circulation loop can reach 75℃ after heat absorption, and the return water temperature is 50℃, which can meet the heat demand of the heating end;

[0027] The second heat supply unit is a domestic hot water unit, which comprises a secondary heat exchanger 7 and a heat preservation water tank 15, the water inlet on the hot water side of the secondary heat exchanger 7 is connected with the second branch L2 through a fifth pipeline, the water outlet is connected with the third branch L3 through a sixth pipeline, a seventh valve F7 is arranged on the fifth pipeline, and an eighth valve F8 is arranged on the third branch L3 between the fifth pipeline and the sixth pipeline; the third branch L3 is connected with the first branch L1, and the terminal of the third branch L3 can be connected with a municipal reclaimed water system or a municipal greening water, realizing the maximum utilization of water resources and reducing waste; the secondary heat exchanger 7 and the heat preservation water tank 15 (the water in the heat preservation water tank 15 is heated from top to bottom) are connected through a pipeline to form a hot water heating circulation loop, and a hot water circulation pump 13 is arranged on the hot water heating circulation loop; the condensed water (70℃) after the first utilization enters the secondary heat exchanger 7, and the heat is transferred to the return water of the hot water circulation loop, and the water in the heat preservation water tank 15 is heated to 60℃ by the hot water circulation loop, and the steam condensed water is reduced to 40℃ after heat exchange, realizing the secondary utilization of high-temperature condensed water; in addition, the heat preservation water tank 15 is connected with the domestic hot water user end through a hot water supply pipeline, the return water of the domestic hot water user is connected with the heat preservation water tank 15, and a hot water supply pump 14 is arranged on the hot water supply pipeline to provide power for the water use of the domestic hot water user end;

[0028] The third heat supply unit is an air conditioning heating unit, which comprises a water source heat pump unit 8, the water source heat pump unit 8 and an air conditioning heating end form an air conditioning heating circuit through pipelines, and an air conditioning heating circulating pump 12 is arranged on the air conditioning heating circuit; the water inlet of the water source side of the water source heat pump unit 8 is connected with the third branch L3 through a seventh pipeline, and the water outlet is connected with the third branch L3 through an eighth pipeline, a ninth valve F9 is arranged on the seventh pipeline, and a tenth valve F10 is arranged on the third branch L3 between the seventh pipeline and the eighth pipeline; when the eighth valve F8 is closed, the condensed water after the secondary heat exchange directly enters the water source heat pump unit 8 from the secondary heat exchanger 7, exchanges heat with the return water in the air conditioning heating circuit, and the steam condensed water is cooled from 40 DEG C to 20 DEG C after heat exchange, so that the three-level utilization of the steam condensed water is realized, and the utilization rate is improved.

[0029] As can be seen from the above, the present application converts part of the sensible heat of the recovered high-temperature steam condensed water into latent heat by using the flash tank 1, and the steam condensed water can be used again after being pressurized, realizing the reuse of the flash steam; the condensed water tank 3 is a closed tank, and the steam condensed water after the flash is introduced into the condensed water tank 3, so that the generation of secondary steam can be avoided; the present application realizes the first-level utilization of the steam condensed water by using the first heat exchanger 6 / cold supply unit, realizes the second-level utilization of the steam condensed water by using the second heat exchanger 7, and realizes the third-level utilization of the steam condensed water by using the water source heat pump unit 8, so that the heat utilization rate of the steam condensed water is greatly improved. In addition, the steam condensed water is introduced into the flash tank 1 through the pipeline, and part of the steam condensed water is converted into steam after being flashed in the flash tank 1 and is used again, and the remaining part is introduced into the condensed water tank 3, so that the steam condensed water can be prevented from contacting the external environment, and the cleanliness of the steam condensed water is ensured.

[0030] The cold and heat supply unit of the present application can be used for steam, heating, air conditioning, refrigeration and domestic hot water, widens the utilization space of the steam condensed water waste heat, realizes the waste heat recovery and utilization and low-temperature discharge of the steam condensed water in the whole operation cycle, improves the sustainability and continuity of the system, and helps to reduce the energy cost of enterprises and reduce the environmental impact. In actual operation, the cold and heat load demand time and the steam condensed water generation time are completely consistent, so that the reliability and stability of the system operation are ensured.

[0031] To ensure the stable operation of the whole system, the combined cooling and heating unit further comprises an air source heat pump unit 9, the first interface of the air source heat pump unit 9 is provided with a first branch pipe and a second branch pipe, the first branch pipe is connected with the hot water outlet of the water source heat pump unit 8, the second branch pipe is connected with the water outlet of the cold water end of the hot water type absorption cold water unit 5, the first branch pipe is provided with a sixth valve F6, and the second branch pipe is provided with a fourth valve F4; the second interface of the air source heat pump unit 9 is provided with a third branch pipe and a fourth branch pipe, the other end of the third branch pipe is connected with the chilled water return pipe, the other end of the fourth branch pipe is connected with the water return outlet of the water source heat pump unit 8, the third branch pipe is provided with a third valve F3, and the fourth branch pipe is provided with a fifth valve F5. The air source heat pump unit 9 has a refrigeration mode and a heating mode, when the heat of the steam condensate water cannot meet the cooling demand, the fifth valve F5 and the sixth valve F6 are closed, the third valve F3 and the fourth valve F4 are opened, the cold water supply of the air source heat pump unit 9 enters the chilled water supply pipe, and part of the return water of the cold end enters the air source heat pump unit 9, so that the air source heat pump is supplemented with cold, and the demand of the cold end is met; when the water source heat pump unit 8 cannot meet the air conditioning and heating demand, the air source heat pump unit 9 can start the heating mode, at this time, the third valve F3 and the fourth valve F4 are closed, the fifth valve F5 and the sixth valve F6 are opened, the air source heat pump unit 9 heats the water and sends the water into the air conditioning water supply pipeline of the air conditioning heating circuit, and part of the return water in the air conditioning heating circuit flows back to the air source heat pump unit 9, so that the air source heat pump unit 9 is supplemented with heat, and the demand of the air conditioning and heating user end is met.

[0032] In actual operation, the recovered high-temperature steam condensate water directly enters the flash tank 1, part of low-pressure steam (pressure about 0.1 MPa) is generated after flashing, and then enters the water vapor supply system again after being pressurized by the water vapor compressor 2, thereby reducing the energy consumption of the water vapor supply system; the high-temperature condensate water enters the condensate tank 3.

[0033] When cooling is needed, the first valve F1, the seventh valve F7 and the tenth valve F10 are opened, the second valve F2, the eighth valve F8, the ninth valve F9 and the eleventh valve F11 are closed, the hot water type absorption heat pump unit is used for primary utilization, the steam condensate water is reduced from 90 DEG C to 120 DEG C to 70 DEG C after the hot water type absorption heat pump unit and flows into the second branch L2, the hot water type absorption heat pump unit absorbs heat and provides 7 DEG C chilled water for the cooling end;

[0034] The steam condensate water (70 DEG C) after primary utilization enters the secondary heat exchanger 7, heat is transferred to the water in the heat preservation water tank 15 through the secondary heat exchanger 7, the steam condensate water is cooled from 70 DEG C to 40 DEG C after heat exchange, secondary utilization of the steam condensate water is realized, and more than 60 DEG C domestic hot water is provided for users;

[0035] The steam condensate after secondary utilization enters the water source heat pump unit 8 again, is cooled to 20℃ from 40℃ after heat exchange, realizes the tertiary utilization of steam condensate, and the steam condensate after tertiary utilization can be used as municipal greening water, etc., realizes the full utilization of water resources, and avoids the waste of water resources;

[0036] In the cooling period, if the hot water type absorption heat pump unit cannot meet the demand, the air source heat pump unit 9 can be used in the refrigeration mode to supplement cooling, as follows: the third valve F3 and the fourth valve F4 are opened, and the fifth valve F5 and the sixth valve F6 are closed, the chilled water provided by the air source heat pump unit 9 enters the chilled water supply pipe, and part of the return water at the cooling end enters the air source heat pump unit 9, so as to realize the air source heat pump cooling.

[0037] When the cooling end does not need cooling, the steam condensate can be used for primary utilization by the first heat exchanger 6, in the running process, the second valve F2, the seventh valve F7 and the ninth valve F9 are opened, and the first valve F1, the eighth valve F8, the tenth valve F10 and the eleventh valve F11 are closed, the steam condensate in the condensate tank 3 enters the first branch L1 into the first heat exchanger, is reduced to 70℃ from 90℃-120℃ after heat exchange and flows into the second branch L2, and then is used for secondary recycling by the second heat exchanger 7 and tertiary recycling by the water source heat pump unit 8. In this process, if the water source heat pump unit 8 cannot meet the demand, the air source heat pump unit 9 can be used for heating, at this time, the third valve F3 and the fourth valve F4 are closed, and the fifth valve F5 and the sixth valve F6 are opened, the air source heat pump unit 9 heats the water and sends it into the air conditioning water supply pipeline of the air conditioning heating circuit, part of the return water in the air conditioning heating circuit flows back to the air source heat pump unit 9, so as to realize the air source heat pump unit 9 heating, and meet the demand of the air conditioning heating user end.

[0038] When the cooling end needs cooling and the radiator heating end needs heating, the first valve F1, the second valve F2, the seventh valve F7 and the ninth valve F9 are opened, and the eighth valve F8, the tenth valve F10 and the eleventh valve F11 are closed, the high-temperature steam condensate from the condensate tank 3 is divided into two ways, one way enters the hot water type absorption heat pump unit, and the other way enters the first heat exchanger 6, the hot water type absorption heat pump unit and the first heat exchanger 6 are used for primary recycling, then the second heat exchanger 7 is used for secondary recycling, and finally the water source heat pump unit 8 is used for tertiary recycling.

[0039] When in the non-heating season and the cold end is not used, the high-temperature steam condensate of the present application can be directly used to heat the water in the heat preservation water tank 15, thereby providing domestic hot water for users. Specifically: open the seventh valve F7, the tenth valve F10 and the eleventh valve F11, close the first valve F1 to the sixth valve F6, the eighth valve F8 and the ninth valve F9, so that the steam condensate (temperature 90-120℃) in the condensate tank 3 directly enters the secondary heat exchanger 7 through the second branch L2, that is, directly uses the high-temperature steam condensate to produce domestic hot water, when the heat preservation water tank 15 reaches the highest limit level, stop heating.

[0040] The system of the present application can flash out part of the steam from the recovered high-temperature steam condensate during operation, and then pressurize and use it again in the water vapor supply system, to avoid the steam condensate in the condensate tank 3 from vaporizing; the present application can recycle and utilize the steam condensate in the condensate tank 3 in three stages, to improve the heat utilization rate of the steam condensate; during operation, the air source heat pump unit 9 can be used for cooling or heating, to further improve the stability and reliability of the entire system; the cold and heat load demand time of the present application is completely consistent with the steam condensate generation time, to ensure the reliability and stability of the system operation.

[0041] Finally, it should be emphasized that the above description is only the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions recorded in the foregoing embodiments without creative labor, or make equivalent replacements to some technical features. Thus, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A combined cooling and heating system based on deep utilization of waste heat from steam condensate, comprising a waste heat recovery unit and a combined cooling and heating unit, characterized in that: It also includes a condensate tank for storing high-temperature condensate and a steam utilization unit; the waste heat recovery unit includes a flash tank connected to a recovery pipeline, the steam utilization unit includes a steam compressor, the steam port of the flash tank is connected to a steam user through a steam pipeline, and the steam compressor is installed on the steam pipeline; the combined cooling and heating unit includes a cooling unit, a first heating unit, a second heating unit, and a third heating unit; A condensate pump is installed on the main water supply line of the condensate tank. A first branch line and a second branch line are connected to the main water supply line. The cooling unit has a hot water absorption chiller. The hot water inlet of the hot water absorption chiller is connected to the first branch line through the first pipe, and its hot water outlet is connected to the second branch line through the second pipe. A first valve is installed on the first pipe. An eleventh valve is installed on the second branch line located upstream of the second pipe. The first heating unit includes a primary heat exchanger. The inlet of the primary heat exchanger on the heat source side is connected to the first branch through a third pipeline, and a second valve is installed on the third pipeline. The outlet of the primary heat exchanger on the heat source side is connected to the second branch through a fourth pipeline. The second heating unit is a domestic hot water unit, which includes a secondary heat exchanger and an insulated water tank. The inlet of the hot water side of the secondary heat exchanger is connected to the second branch through a fifth pipeline, and its outlet is connected to the tertiary branch through a sixth pipeline. A seventh valve is installed on the fifth pipeline, and an eighth valve is installed on the tertiary branch located between the fifth and sixth pipelines. The secondary heat exchanger and the insulated water tank are connected by pipelines to form a hot water heating circulation loop, and a hot water circulation pump is installed on the hot water heating circulation loop. The third heating unit is an air conditioning heating unit, which includes a water source heat pump unit. The water source heat pump unit and the air conditioning heating end form an air conditioning heating circuit through pipelines, and an air conditioning heating circulation pump is installed on the air conditioning heating circuit. The water source side inlet of the water source heat pump unit is connected to the third-level branch through the seventh pipeline, and its outlet is connected to the third-level branch through the eighth pipeline. A ninth valve is installed on the seventh pipeline, and a tenth valve is installed on the third-level branch located between the seventh pipeline and the eighth pipeline.

2. The combined cooling and heating system based on deep utilization of waste heat from steam condensate according to claim 1, characterized in that: The hot water type absorption chiller unit of the cooling unit and the cooling end are connected by a chilled water supply pipe and a chilled water return pipe to form a chilled water circulation loop. A cooling circulation pump is installed on the chilled water return pipe. The combined cooling and heating unit also includes an air source heat pump unit. The first interface of the air source heat pump unit has a first branch pipe and a second branch pipe. The first branch pipe is connected to the hot water outlet of the water source heat pump unit, and the second branch pipe is connected to the cold water outlet of the hot water absorption chiller unit. A sixth valve is provided on the first branch pipe, and a fourth valve is provided on the second branch pipe. The air source heat pump unit has a third branch pipe and a fourth branch pipe at the second interface. The other end of the third branch pipe is connected to the chilled water return pipe, and the other end of the fourth branch pipe is connected to the return water port of the water source heat pump unit. A third valve is installed on the third branch pipe, and a fifth valve is installed on the fourth branch pipe.

3. The combined cooling and heating system based on deep utilization of waste heat from steam condensate according to claim 1, characterized in that: The insulated water tank is connected to the domestic hot water user end through a hot water supply pipeline, and the return water from the domestic hot water user is connected to the insulated water tank. A hot water supply pump is installed on the hot water supply pipeline.

4. The combined cooling and heating system based on deep utilization of waste heat from steam condensate according to claim 1, characterized in that: The first heating unit is radiator heating. The primary heat exchanger and the radiator heating end form a heating circulation loop through a heating hot water supply pipe and a heating hot water return pipe. A heating circulation pump is installed on the heating hot water return pipe, and there is at least one set of heating circulation pumps.

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