Industrial circulating cooling water waste heat recycling and heat load balance buffering coupling system

Abstract

The invention discloses an industrial circulating cooling water waste heat recycling and thermal load balance buffering coupling system which comprises a power generation mechanism and an absorption heat pump, and the power generation mechanism comprises a boiler, a steam turbine, a condenser, a cooling tower and a circulating water pump; a refrigerant inlet of the absorption heat pump is communicated with a condensed water outlet of the condenser, a refrigerant outlet of the absorption heat pump is communicated with the boiler, a heating medium inlet of the absorption heat pump is communicated with a circulating water outlet of the condenser, and a heating medium outlet of the absorption heat pump is communicated with an inlet of the cooling tower. The waste heat recycling system has the beneficial effects that the waste heat recycling system is coupled with the condensed water return system, the condensed water return water of the condenser is preheated through waste heat of industrial circulating cooling water, the temperature of the condensed water return water is increased so as to supplement negative fluctuation of boiler water heat load, and meanwhile the overtemperature of circulating water at extreme air temperature in summer is buffered; and the risk of backpressure rise of the condenser is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery and utilization of industrial circulating cooling water in thermal power and waste heat power plants, and in particular to a waste heat recovery and utilization of industrial circulating cooling water and a heat load balancing buffer coupling system. Background Art

[0002] In the thermal power generation industry, fossil fuels such as coal, natural gas, and coal gas are burned to release heat energy to generate steam to drive steam turbines for power generation. After the high-grade heat source is used, its heat energy grade gradually decreases. Based on the application of power generation technology based on flue gas waste heat utilization and organic Rankine cycle principle, medium and low-grade heat energy is further utilized and consumed. Most of the low-grade heat sources are still discharged into the environment through the industrial cooling water system, which not only causes energy waste but also brings certain waste heat pollution to the environment. Therefore, the utilization of waste heat from low-grade heat sources has always been a key research area for energy conservation and consumption reduction in the field of thermal power generation and waste heat power generation. Due to the large amount of water and low quality of waste heat in industrial circulating cooling water systems, waste heat utilization also has problems such as low utilization rate, poor energy efficiency, and insufficient economy. On the other hand, fluctuations in operating conditions such as fuel calorific value, natural gas or coal gas fluctuations lead to fluctuations in boiler furnace temperature and changes in steam heat load, which affect the power generation efficiency of the steam turbine and also have an impact on the stable operation of the unit.

[0003] Specifically, the typical process of thermal power generation or waste heat power generation is as follows: the combustion of fossil fuels releases heat energy or other high-grade waste heat sources to heat the boiler. The boiler generates high-pressure, ultra-high-pressure, subcritical, supercritical or ultra-supercritical steam to drive the turbine to generate power. The steam after releasing the potential energy enters the condenser, is cooled by industrial circulating cooling water and condensed into water. The condensed water returns to the boiler for recirculation, and the condensed water temperature is around 35°C.

[0004] The heated industrial cooling water returns to the cooling tower for cooling, collects in the cold water pool, and then is transported to the condenser through the circulating water pump as cooling water for reciprocating circulation. The circulating cooling water inlet temperature is ≤33℃, the return water temperature rises by 8~10℃, and is ≤43℃. It is one of the most common low-quality heat sources in thermal power generation or waste heat power generation projects. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an industrial circulating cooling water waste heat recovery and thermal load balancing and buffering coupling system, which can be combined with the thermal system of the entire plant, while fully recovering and utilizing the waste heat in the cooling water, and balancing and buffering the thermal load of the thermal system, thereby helping to stabilize the thermal system of the entire plant and realize efficient and stable operation of the generator set.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides an industrial circulating cooling water waste heat recovery and utilization and heat load balancing buffer coupling system, comprising: A power generation mechanism, the power generation mechanism comprising a boiler, a steam turbine, a condenser, a cooling tower and a circulating water pump, the steam outlet of the boiler being connected to the inlet of the steam turbine, the outlet of the steam turbine being connected to the steam inlet of the condenser, the inlet of the circulating water pump being connected to the outlet of the cooling tower, and the outlet of the circulating water pump being connected to the circulating water inlet of the condenser; and, An absorption heat pump, wherein the refrigerant inlet of the absorption heat pump is connected to the condensate outlet of the condenser, the refrigerant outlet of the absorption heat pump is connected to the boiler, the heat medium inlet of the absorption heat pump is connected to the circulating water outlet of the condenser, and the heat medium outlet of the absorption heat pump is connected to the inlet of the cooling tower. In some embodiments, the steam outlet of the boiler is connected to the inlet of the steam turbine via a superheated steam pipe.

[0007] In some embodiments, the industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a first connecting manifold, the first connecting manifold includes a condensate pipe, a first tee, a first condensate branch pipe, a second condensate branch pipe, a first condensate valve and a second condensate valve, one end of the condensate pipe is connected to the condensate outlet of the condenser, the other end of the condensate pipe is connected to the first interface of the first tee, one end of the first condensate branch pipe is connected to the second interface of the first tee, the other end of the first condensate branch pipe is connected to the boiler, one end of the second condensate branch pipe is connected to the third interface of the first tee, the other end of the second condensate branch pipe is connected to the refrigerant inlet of the absorption heat pump, the first condensate valve is arranged on the first condensate branch pipe, and the second condensate valve is arranged on the second condensate branch pipe.

[0008] In some embodiments, the power generation mechanism further includes a deaerator, the inlet of the deaerator is connected to the other end of the first condensate branch pipe, and the outlet of the deaerator is connected to the boiler.

[0009] In some embodiments, the industrial circulating cooling water waste heat recovery and thermal load balancing buffer coupling system also includes a heating and heating station, the heating inlet of the heating and heating station is connected to the refrigerant outlet of the absorption heat pump, and the heating outlet of the heating and heating station is connected to the refrigerant inlet of the absorption heat pump.

[0010] In some embodiments, the industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a second connecting manifold, the second connecting manifold includes a second tee, a return pipe, a heating inlet pipe, a third tee, a heating outlet pipe, a return valve, a heating inlet valve and a heating outlet valve, the first interface of the second tee is connected to the refrigerant outlet of the absorption heat pump, the second interface of the second tee is connected to one end of the return pipe, the other end of the return pipe is connected to the inlet of the deaerator, one end of the heating inlet pipe is connected to the third interface of the second tee The three interfaces are connected, the other end of the heating inlet pipe is connected to the heating inlet of the heating station, one end of the heating outlet pipe is connected to the heating outlet of the heating station, the other end of the heating outlet pipe is connected to the first interface of the third tee, the second interface of the third tee is connected to the other end of the second condensate branch pipe, the third interface of the third tee is connected to the refrigerant inlet of the absorption heat pump, the reflux valve is arranged on the reflux pipe, the heating inlet valve is arranged on the heating inlet pipe, and the heating outlet valve is arranged on the heating outlet pipe.

[0011] In some embodiments, the industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a third connecting manifold, the third connecting manifold includes a fourth tee, a heat medium inlet pipe, a heat medium inlet valve, a heat medium outlet pipe, a heat medium outlet valve, a connecting pipe, a fifth tee and a connecting valve, the first interface of the fourth tee is connected to the circulating water outlet of the condenser, the second interface of the fourth tee is connected to one end of the heat medium inlet pipe, the other end of the heat medium inlet pipe is connected to the heat medium inlet of the absorption heat pump, the heat medium inlet valve is arranged on the heat medium inlet pipe, one end of the heat medium outlet pipe is connected to the heat medium outlet of the absorption heat pump, the other end of the heat medium outlet pipe is connected to the first interface of the fifth tee, the heat medium outlet valve is arranged on the heat medium outlet pipe, the two ends of the connecting pipe are respectively connected to the third interface of the fourth tee and the second interface of the fifth tee, the third interface of the fifth tee is connected to the inlet of the cooling tower, and the connecting valve is arranged on the connecting pipe.

[0012] In some embodiments, the industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a water-cooled air conditioner, the cooling water inlet of the water-cooled air conditioner is connected to the outlet of the circulating water pump, and the cooling water outlet of the water-cooled air conditioner is connected to the inlet of the cooling tower.

[0013] In some embodiments, the industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a fourth connecting manifold, the fourth connecting manifold includes a sixth tee, a circulating inlet pipe, a cooling inlet pipe, a cooling outlet pipe, a circulating inlet valve, a cooling inlet valve and a cooling outlet valve, the first interface of the sixth tee is connected to the outlet of the circulating water pump, the second interface of the sixth tee is connected to one end of the circulating inlet pipe, the other end of the circulating inlet pipe is connected to the circulating water inlet of the condenser, one end of the cooling inlet pipe is connected to the third interface of the sixth tee, the other end of the cooling inlet pipe is connected to the cooling water inlet of the water-cooled air conditioner, one end of the cooling outlet pipe is connected to the cooling water outlet of the water-cooled air conditioner, and the other end of the cooling outlet pipe is connected to the inlet of the cooling tower.

[0014] In some embodiments, the fourth connecting manifold also includes a seventh tee, a first interface of the seventh tee is connected to the inlet of the cooling tower, a second interface of the seventh tee is connected to the other end of the cooling outlet pipe, and a third interface of the seventh tee is connected to the third interface of the fifth tee.

[0015] Compared with the prior art, the beneficial effect of the industrial circulating cooling water waste heat recovery and heat load balance buffer coupling system provided by the present invention is: by coupling the waste heat recovery system with the condensate return system, the condensate return water of the condenser is preheated using the waste heat of the industrial circulating cooling water, and the condensate return water temperature is increased to supplement the negative fluctuation of the boiler water heat load, while buffering the overheating of the circulating water under extreme summer temperatures and reducing the risk of increased condenser back pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system provided by an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the first connecting manifold in FIG. Figure 3 yes Figure 1 A schematic structural diagram of the second connecting manifold in FIG. Figure 4 yes Figure 1 A schematic diagram of the structure of the third connecting manifold and the fourth connecting manifold; Explanation of the reference numerals: 1-power generation mechanism, 11-boiler, 12-steam turbine, 13-condenser, 14-cooling tower, 15-circulating water pump, 16-superheated steam pipe, 17-deaerator, 2-absorption heat pump, 21-refrigerant inlet, 22-refrigerant outlet, 23-heat medium inlet, 24-heat medium outlet, 3-first connecting manifold, 31-condensate pipe, 32-first tee, 33-first condensate branch pipe, 34-second condensate branch pipe, 35-first condensate valve, 36-second condensate valve, 4-heating station, 5-second connecting manifold, 51-second tee, 52-reflux pipe , 53-heating inlet pipe, 54-third three-way, 55-heating outlet pipe, 56-return valve, 57-heating inlet valve, 58-heating outlet valve, 6-third connecting manifold, 61-fourth three-way, 62-heat medium inlet pipe, 63-heat medium inlet valve, 64-heat medium outlet pipe, 65-heat medium outlet valve, 66-connecting pipe, 67-fifth three-way, 68-connecting valve, 7-water-cooled air conditioner, 8-fourth connecting manifold, 81-sixth three-way, 82-circulation inlet pipe, 83-cooling inlet pipe, 84-cooling outlet pipe, 85-circulation inlet valve, 86-cooling inlet valve, 87-cooling outlet valve, 88-seventh three-way. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to combine the thermal system of the whole plant, fully recover and utilize the waste heat in the cooling water, and balance and buffer the thermal load of the thermal system at the same time, so as to help stabilize the thermal system of the whole plant and realize efficient and stable operation of the generator set, the present invention provides an industrial circulating cooling water waste heat recovery and thermal load balancing buffer coupling system.

[0019] See also Figure 1 , Figure 1 This is a structural schematic diagram of an industrial circulating cooling water waste heat recovery and thermal load balancing buffer coupling system in one embodiment of the present invention. The industrial circulating cooling water waste heat recovery and thermal load balancing buffer coupling system includes a power generation mechanism 1 and an absorption heat pump 2.

[0020] The power generation mechanism 1 includes a boiler 11, a steam turbine 12, a condenser 13, a cooling tower 14 and a circulating water pump 15. The steam outlet of the boiler 11 is connected to the inlet of the steam turbine 12, the outlet of the steam turbine 12 is connected to the steam inlet of the condenser 13, the inlet of the circulating water pump 15 is connected to the outlet of the cooling tower 14, and the outlet of the circulating water pump 15 is connected to the circulating water inlet of the condenser 13.

[0021] The working process of the power generation mechanism 1 is as follows: First, high-temperature and high-pressure steam is generated by the boiler 11. The steam flows out from the steam outlet of the boiler 11 and is directly sent to the inlet of the steam turbine 12. Inside the steam turbine 12, the steam drives the turbine blades to rotate, and then drives the generator rotor to rotate, converting the thermal energy of the steam into mechanical energy, and finally into electrical energy output. After the steam turbine 12 uses the steam to do work, the pressure and temperature of the steam decrease and become exhaust steam. The exhaust steam is then discharged from the outlet of the steam turbine 12 and enters the steam inlet of the condenser 13. In the condenser 13, the exhaust steam exchanges heat with the cooling water sent by the circulating water pump 15. The cooling water flows out of the cooling tower 14, is pressurized by the circulating water pump 15, and is sent to the circulating water inlet of the condenser 13. Inside the condenser 13, the cooling water absorbs the heat of the exhaust steam, causing it to condense into water, and at the same time the temperature of the cooling water itself increases. After the heat exchange is completed, the cooling water with increased temperature flows out of the condenser 13. The water condensed in the condenser 13 flows back to the boiler 11 through the corresponding pipeline system and is heated again into high-temperature and high-pressure steam, forming a closed-loop steam cycle.

[0022] The refrigerant inlet 21 of the absorption heat pump 2 is connected to the condensate outlet of the condenser 13, the refrigerant outlet 22 of the absorption heat pump 2 is connected to the boiler 11, the heat medium inlet 23 of the absorption heat pump 2 is connected to the circulating water outlet of the condenser 13, and the heat medium outlet 24 of the absorption heat pump 2 is connected to the inlet of the cooling tower 14.

[0023] When in use, first, high-temperature and high-pressure steam is generated in the boiler 11. The steam is transported to the inlet of the steam turbine 12 through the steam outlet of the boiler 11. Inside the steam turbine 12, the steam drives the steam turbine to rotate, which in turn drives the generator to generate electricity, converting the thermal energy of the steam into mechanical energy, and finally into electrical energy. The steam that has done work in the steam turbine 12 has its pressure and temperature significantly reduced and becomes exhaust steam. The exhaust steam is then sent to the steam inlet of the condenser 13 through the outlet of the steam turbine 12. In the condenser 13, the exhaust steam exchanges heat with the cooling water sent in by the circulating water pump 15, and the steam is condensed into condensed water, while the temperature of the cooling water increases. After the cooling water absorbs heat in the condenser 13, it flows out from the circulating water outlet of the condenser 13 and enters the heat medium inlet 23 of the absorption heat pump 2. Inside the absorption heat pump 2, the high-temperature cooling water acts as a heat medium to transfer heat to the refrigerant working medium inside the heat pump, causing it to evaporate. The evaporated refrigerant absorbs more heat through the circulation inside the heat pump, and releases heat from the heat medium (cooling water), so that the temperature of the heat medium (cooling water) is reduced. The cooling water with reduced temperature flows out from the heat medium outlet 24 of the absorption heat pump 2 and is sent back to the inlet of the cooling tower 14. In the cooling tower 14, the cooling water is cooled by natural wind to reduce the temperature in preparation for the next cycle. At the same time, the condensed water enters the absorption heat pump 2 from the refrigerant inlet of the absorption heat pump 2, absorbs the heat of the cooling water, and is discharged from the refrigerant outlet of the absorption heat pump 2 after the temperature rises, and finally returns to the boiler 11.

[0024] The technical solution provided by the present invention couples the waste heat recovery system with the condensate return system, utilizes the waste heat of industrial circulating cooling water to preheat the condensate return of the condenser, and increases the condensate return water temperature to supplement the negative fluctuation of the boiler water heat load, while buffering the overheating of the circulating water under extreme summer temperatures and reducing the risk of increased condenser back pressure.

[0025] In the specific implementation process, if the refrigerant exchangeable absorption heat load or heating load demand is large, the circulating water temperature drops significantly or exceeds 8-10℃, the cooling tower system can be shut down. If the project situation permits, the construction scale of the cooling tower system can be reduced or cancelled.

[0026] In one embodiment, see Figure 1 The steam outlet of the boiler 11 is connected to the inlet of the steam turbine 12 via a superheated steam pipe 16 .

[0027] In one embodiment, see Figure 1-Figure 3The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a first connecting manifold 3, which includes a condensate pipe 31, a first tee 32, a first condensate branch pipe 33, a second condensate branch pipe 34, a first condensate valve 35 and a second condensate valve 36. One end of the condensate pipe 31 is connected to the condensate outlet of the condenser 13, and the other end of the condensate pipe 31 is connected to the first interface of the first tee 32, one end of the first condensate branch pipe 33 is connected to the second interface of the first tee 32, the other end of the first condensate branch pipe 33 is connected to the boiler 11, one end of the second condensate branch pipe 34 is connected to the third interface of the first tee 32, and the other end of the second condensate branch pipe 34 is connected to the refrigerant inlet 21 of the absorption heat pump 2. The first condensate valve 35 is arranged on the first condensate branch pipe 33, and the second condensate valve 36 is arranged on the second condensate branch pipe 34.

[0028] In one embodiment, see Figure 1-Figure 3 The power generation mechanism 1 further includes a deaerator 17 , an inlet of the deaerator 17 is connected to the other end of the first condensate branch pipe 33 , and an outlet of the deaerator 17 is connected to the boiler 11 .

[0029] In one embodiment, see Figure 1-Figure 3 , the industrial circulating cooling water waste heat recovery and thermal load balancing buffer coupling system also includes a heating and heating station 4, the heating inlet of the heating and heating station 4 is connected to the refrigerant outlet 22 of the absorption heat pump 2, and the heating outlet of the heating and heating station 4 is connected to the refrigerant inlet 21 of the absorption heat pump 2. By setting up the heating and heating station 4, the waste heat in the boiler condensate return water can be absorbed and transferred to the heating and heating station as a heat medium to take away the excessive calorific value of the boiler fuel, buffer the positive fluctuation of the thermal load in the operation of the generator set, reduce the energy waste or safety risks of exhaust steam emission and higher-grade steam heat dissipation, and maintain the smooth operation of the thermal system. When the heating demand is large enough to absorb the waste heat of the industrial circulating water system, the heating and heating station can be incorporated into the absorption heat pump system or merged with it, while reducing the operating load of the cooling tower.

[0030] In one embodiment, see Figure 1-Figure 3The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a second connecting manifold 5, which includes a second three-way pipe 51, a return pipe 52, a heating inlet pipe 53, a third three-way pipe 54, a heating outlet pipe 55, a return valve 56, a heating inlet valve 57 and a heating outlet valve 58. The first interface of the second three-way pipe 51 is connected to the refrigerant outlet 22 of the absorption heat pump 2, the second interface of the second three-way pipe 51 is connected to one end of the return pipe 52, the other end of the return pipe 52 is connected to the inlet of the deaerator 17, and one end of the heating inlet pipe 53 is connected to the third interface of the second three-way pipe 51. The other end of the heating inlet pipe 53 is connected to the heating inlet of the heating station 4, one end of the heating outlet pipe 55 is connected to the heating outlet of the heating station 4, the other end of the heating outlet pipe 55 is connected to the first interface of the third tee 54, the second interface of the third tee 54 is connected to the other end of the second condensate branch pipe 34, the third interface of the third tee 54 is connected to the refrigerant inlet 21 of the absorption heat pump 2, the reflux valve 56 is arranged on the reflux pipe 52, the heating inlet valve 57 is arranged on the heating inlet pipe 53, and the heating outlet valve 58 is arranged on the heating outlet pipe 55.

[0031] In one embodiment, see Figure 1-Figure 4 The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a third connecting manifold 6, the third connecting manifold 6 includes a fourth three-way 61, a heat medium inlet pipe 62, a heat medium inlet valve 63, a heat medium outlet pipe 64, a heat medium outlet valve 65, a connecting pipe 66, a fifth three-way 67 and a connecting valve 68, the first interface of the fourth three-way 61 is connected to the circulating water outlet of the condenser 13, the second interface of the fourth three-way 61 is connected to one end of the heat medium inlet pipe 62, and the other end of the heat medium inlet pipe 62 is connected to the heat medium inlet 23 of the absorption heat pump 2 The heat medium inlet valve 63 is connected, and one end of the heat medium outlet pipe 64 is connected to the heat medium outlet 24 of the absorption heat pump 2, and the other end of the heat medium outlet pipe 64 is connected to the first interface of the fifth tee 67. The heat medium outlet valve 65 is arranged on the heat medium outlet pipe 64, and the two ends of the connecting pipe 66 are respectively connected to the third interface of the fourth tee 61 and the second interface of the fifth tee 67, and the third interface of the fifth tee 67 is connected to the inlet of the cooling tower 14. The connecting valve 68 is arranged on the connecting pipe 66.

[0032] In one embodiment, see Figure 1-Figure 4The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a water-cooled air conditioner 7, the cooling water inlet of the water-cooled air conditioner 7 is connected to the outlet of the circulating water pump 15, and the cooling water outlet of the water-cooled air conditioner 7 is connected to the inlet of the cooling tower 14. By setting up the water-cooled air conditioner 7, the heat in the ambient air is transferred to the industrial circulating water system, and then enriched to the condensate return system to balance the heat load distribution of the unit, cascade the utilization of low-quality thermal energy, improve energy utilization, and reduce energy consumption.

[0033] In one embodiment, see Figure 1-Figure 4 The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system also includes a fourth connecting manifold 8, which includes a sixth tee 81, a circulating inlet pipe 82, a cooling inlet pipe 83, a cooling outlet pipe 84, a circulating inlet valve 85, a cooling inlet valve 86 and a cooling outlet valve 87. The first interface of the sixth tee 81 is connected to the outlet of the circulating water pump 15, the second interface of the sixth tee 81 is connected to one end of the circulating inlet pipe 82, the other end of the circulating inlet pipe 82 is connected to the circulating water inlet of the condenser 13, one end of the cooling inlet pipe 83 is connected to the third interface of the sixth tee 81, the other end of the cooling inlet pipe 83 is connected to the cooling water inlet of the water-cooled air conditioner 7, one end of the cooling outlet pipe 84 is connected to the cooling water outlet of the water-cooled air conditioner 7, and the other end of the cooling outlet pipe 84 is connected to the inlet of the cooling tower 14.

[0034] In one embodiment, see Figure 1-Figure 4 The fourth connecting manifold 8 also includes a seventh tee 88, a first interface of the seventh tee 88 is connected to the inlet of the cooling tower 14, a second interface of the seventh tee 88 is connected to the other end of the cooling outlet pipe 84, and a third interface of the seventh tee 88 is connected to the third interface of the fifth tee 67.

[0035] The beneficial effects of the technical solution provided by the present invention include: (1) By coupling the waste heat recovery system with the condensate return system, the waste heat of industrial circulating cooling water is used to preheat the condensate return water, thereby increasing the condensate return water temperature to compensate for the negative fluctuation of the boiler water heat load, while buffering the risks of circulating water overheating and increased condenser back pressure under extreme summer temperatures; (2) By coupling the waste heat recovery system with the heating system, the waste heat of industrial circulating cooling water or condensate return water is used to heat the heating return water (in this case, the condensate return water is the heat medium end of the absorption heat pump system) to meet the winter heating demand or the needs of heating users within the factory; at the same time, part of the waste heat in the condensate return water is absorbed to offset the positive fluctuation of the boiler water heat load, supplementing the operation control measures of the unit overload; (3) By coupling the water-cooled air conditioner, absorption heat pump system and condensate return system in series, the heat in the ambient air is transferred to the industrial circulating water system and then enriched in the condensate return system to balance the heat load distribution of the unit, cascade the utilization of low-quality thermal energy, improve energy utilization and reduce energy consumption.

[0036] In addition, in the field of thermal power generation or waste heat power generation, industrial circulating cooling water is one of the most typical low-quality heat sources. In actual projects, different types of wastewater, such as boiler fixed-line drainage, boiler sampling rack drainage, unit drainage trough drainage and other low-quality heat sources; different waste heat application scenarios, such as domestic hot water, antifreeze insulation, process preheating, etc., can all be considered in the same way for waste heat recovery and coupled utilization.

[0037] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system, characterized in that: include: A power generation mechanism, the power generation mechanism comprising a boiler, a steam turbine, a condenser, a cooling tower and a circulating water pump, the steam outlet of the boiler being connected to the inlet of the steam turbine, the outlet of the steam turbine being connected to the steam inlet of the condenser, the inlet of the circulating water pump being connected to the outlet of the cooling tower, and the outlet of the circulating water pump being connected to the circulating water inlet of the condenser; and, An absorption heat pump, wherein the refrigerant inlet of the absorption heat pump is connected to the condensate outlet of the condenser, the refrigerant outlet of the absorption heat pump is connected to the boiler, the heat medium inlet of the absorption heat pump is connected to the circulating water outlet of the condenser, and the heat medium outlet of the absorption heat pump is connected to the inlet of the cooling tower.

2. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 1 is characterized in that: The steam outlet of the boiler is connected to the inlet of the steam turbine via a superheated steam pipe.

3. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 1 is characterized in that: It also includes a first connecting manifold, which includes a condensate pipe, a first tee, a first condensate branch pipe, a second condensate branch pipe, a first condensate valve and a second condensate valve. One end of the condensate pipe is connected to the condensate outlet of the condenser, and the other end of the condensate pipe is connected to the first interface of the first tee, one end of the first condensate branch pipe is connected to the second interface of the first tee, the other end of the first condensate branch pipe is connected to the boiler, one end of the second condensate branch pipe is connected to the third interface of the first tee, the other end of the second condensate branch pipe is connected to the refrigerant inlet of the absorption heat pump, the first condensate valve is arranged on the first condensate branch pipe, and the second condensate valve is arranged on the second condensate branch pipe.

4. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 3 is characterized in that: The power generation mechanism further includes a deaerator, the inlet of the deaerator is connected to the other end of the first condensate branch pipe, and the outlet of the deaerator is connected to the boiler.

5. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 4 is characterized in that: It also includes a heating station, the heating inlet of the heating station is connected to the refrigerant outlet of the absorption heat pump, and the heating outlet of the heating station is connected to the refrigerant inlet of the absorption heat pump.

6. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 5 is characterized in that: It also includes a second connecting manifold, which includes a second tee, a reflux pipe, a heating inlet pipe, a third tee, a heating outlet pipe, a reflux valve, a heating inlet valve and a heating outlet valve. The first interface of the second tee is connected to the refrigerant outlet of the absorption heat pump, the second interface of the second tee is connected to one end of the reflux pipe, the other end of the reflux pipe is connected to the inlet of the deaerator, one end of the heating inlet pipe is connected to the third interface of the second tee, the other end of the heating inlet pipe is connected to the heating inlet of the heating station, one end of the heating outlet pipe is connected to the heating outlet of the heating station, the other end of the heating outlet pipe is connected to the first interface of the third tee, the second interface of the third tee is connected to the other end of the second condensate branch pipe, the third interface of the third tee is connected to the refrigerant inlet of the absorption heat pump, the reflux valve is arranged on the reflux pipe, the heating inlet valve is arranged on the heating inlet pipe, and the heating outlet valve is arranged on the heating outlet pipe.

7. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 1 is characterized in that: It also includes a third connecting manifold, which includes a fourth tee, a heat medium inlet pipe, a heat medium inlet valve, a heat medium outlet pipe, a heat medium outlet valve, a connecting pipe, a fifth tee and a connecting valve. The first interface of the fourth tee is connected to the circulating water outlet of the condenser, the second interface of the fourth tee is connected to one end of the heat medium inlet pipe, the other end of the heat medium inlet pipe is connected to the heat medium inlet of the absorption heat pump, the heat medium inlet valve is arranged on the heat medium inlet pipe, one end of the heat medium outlet pipe is connected to the heat medium outlet of the absorption heat pump, the other end of the heat medium outlet pipe is connected to the first interface of the fifth tee, the heat medium outlet valve is arranged on the heat medium outlet pipe, the two ends of the connecting pipe are respectively connected to the third interface of the fourth tee and the second interface of the fifth tee, the third interface of the fifth tee is connected to the inlet of the cooling tower, and the connecting valve is arranged on the connecting pipe.

8. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 7 is characterized in that: It also includes a water-cooled air conditioner, the cooling water inlet of the water-cooled air conditioner is connected to the outlet of the circulating water pump, and the cooling water outlet of the water-cooled air conditioner is connected to the inlet of the cooling tower.

9. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 8 is characterized in that: It also includes a fourth connecting manifold, which includes a sixth tee, a circulation inlet pipe, a cooling inlet pipe, a cooling outlet pipe, a circulation inlet valve, a cooling inlet valve and a cooling outlet valve, a first interface of the sixth tee is connected to the outlet of the circulating water pump, a second interface of the sixth tee is connected to one end of the circulation inlet pipe, the other end of the circulation inlet pipe is connected to the circulating water inlet of the condenser, one end of the cooling inlet pipe is connected to the third interface of the sixth tee, the other end of the cooling inlet pipe is connected to the cooling water inlet of the water-cooled air conditioner, one end of the cooling outlet pipe is connected to the cooling water outlet of the water-cooled air conditioner, and the other end of the cooling outlet pipe is connected to the inlet of the cooling tower.

10. The industrial circulating cooling water waste heat recovery and heat load balancing buffer coupling system according to claim 9 is characterized in that: The fourth connecting manifold also includes a seventh tee, a first interface of the seventh tee is connected to the inlet of the cooling tower, a second interface of the seventh tee is connected to the other end of the cooling outlet pipe, and a third interface of the seventh tee is connected to the third interface of the fifth tee.

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