High-low temperature two-stage circulation configuration waste heat recovery power, cooling and heating combined supply system

Abstract

The utility model relates to the field of waste heat recovery, in particular to a high-low temperature two-stage circulation configuration waste heat recovery work cooling and heating combined supply system. A heat source is communicated with a heat supply branch I and a high-pressure circulation loop through a three-way valve a; the bottom end of a gas-liquid separator of the low-pressure circulation loop is communicated with the high-pressure circulation loop and the refrigeration unit through a three-way valve b; a high-temperature side outlet of the condenser is communicated with the high-pressure circulation loop, the low-pressure circulation loop and the refrigeration unit through a three-way valve c; a low-temperature side outlet of the condenser is communicated with the heat supply branch II through a three-way valve d; a low-pressure steam generator outlet of the low-pressure circulation loop is communicated with the heat supply branch II through a three-way valve e; a high-pressure turbine outlet of the high-pressure circulation loop, a low-pressure turbine outlet of the low-pressure circulation loop and an outlet of the refrigerating unit ejector b are respectively communicated with the mixer; the high-pressure circulation loop, the low-pressure circulation loop and the refrigeration unit share a condenser, a high-low-pressure two-stage circulation structure is adopted, a heat source and the system are subjected to heat exchange twice, and the heat exchange temperature difference is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of waste heat recovery especially relates to a high and low temperature two stage circulation configuration waste heat recovery power cold heat combined supply system. BACKGROUND

[0002] With the rapid development of social economy, energy consumption in China increases sharply, and energy crisis and environmental problems become increasingly prominent. In the industrial production process, a large amount of heat energy (up to 50% of total heat) is directly discharged into the environment, becoming waste heat. If these waste heat resources can be effectively recycled and utilized, not only can the comprehensive utilization rate of energy be significantly improved, the energy shortage situation can be alleviated, but also environmental pollution can be reduced, and social sustainable development can be promoted.

[0003] As a kind of efficient waste heat recovery technology, cold heat power integrated system can simultaneously generate power, heating and cooling through heat conversion, realizes the multiple utilization of energy, and therefore receives extensive attention. However, when applied to large temperature difference waste heat recovery scene, the existing cold heat power integrated system usually faces problems such as insufficient heat source matching, waste of heat on cold source side and imbalance between thermal efficiency and economic performance, which limits its practical application and promotion. SUMMARY

[0004] The utility model aims at providing a technical scheme capable of solving the above problems.

[0005] A high and low temperature two stage circulation configuration waste heat recovery power cold heat combined supply system, comprising heat source, high pressure circulation loop, low pressure circulation loop, heating branch I, heating branch II, refrigeration unit, three-way valve a, three-way valve b, three-way valve c, three-way valve d, three-way valve e, condenser and mixer;Wherein, heat source is communicated with heating branch I and high pressure circulation loop through three-way valve a;The bottom end of gas-liquid separator of low pressure circulation loop is communicated with high pressure circulation loop and refrigeration unit through three-way valve b;The high temperature side outlet of condenser is communicated with high pressure circulation loop, low pressure circulation loop and refrigeration unit through three-way valve c;The low temperature side outlet of condenser is communicated with heating branch II through three-way valve d;The outlet of low pressure steam generator of low pressure circulation loop is communicated with heating branch II through three-way valve e;The high pressure turbine outlet of high pressure circulation loop, the low pressure turbine outlet of low pressure circulation loop and the ejector b outlet of refrigeration unit are communicated with mixer respectively;High pressure circulation loop, low pressure circulation loop and refrigeration unit share condenser.

[0006] As a further scheme of the utility model: heating branch I includes heat exchanger a and heat user place a. Heat exchanger a is connected with heat source inlet through the first outlet of three-way valve a.

[0007] As a further scheme of the utility model: high pressure circulating loop includes high pressure working medium pump, high pressure preheater, high pressure evaporator, high pressure superheater, ejector a, high pressure turbine and high pressure generator, heat source is connected with high pressure superheater high temperature side entrance through three-way valve a second outlet, then passes through high pressure evaporator and high temperature preheater high temperature side in proper order;High pressure working medium pump's outlet is connected with high pressure preheater low temperature side entrance, and high pressure preheater low temperature side's outlet is connected with high pressure evaporator low temperature side entrance, and the right side entrance of ejector a is connected with high pressure evaporator low temperature side outlet, and the bottom entrance of ejector a is connected with low pressure circulating loop gas-liquid separator bottom outlet through three-way valve b first outlet, and the outlet of ejector a is connected with high pressure superheater low temperature side entrance, and high pressure superheater low temperature side's outlet is connected with high pressure turbine entrance, and high pressure turbine and high pressure generator are connected through shaft coupling, and the outlet of high pressure turbine is connected with mixer third entrance.

[0008] As a further scheme of the utility model: low pressure circulating loop includes low pressure working medium pump, low pressure steam generator, gas-liquid separator, low pressure turbine and low pressure generator, and the high temperature side entrance of low pressure steam generator is connected with the high temperature side outlet of high temperature preheater of high pressure circulating loop, and the outlet of low pressure working medium pump is connected with the low temperature side entrance of low pressure steam generator, and the low temperature side outlet of low pressure steam generator is connected with the entrance of gas-liquid separator, and the liquid outlet of gas-liquid separator is connected with the entrance of three-way valve b, and the gas outlet of gas-liquid separator is connected with the entrance of low pressure turbine, and the output end of low pressure turbine is connected with the input end of low pressure generator, and the outlet of low pressure turbine is connected with mixer second entrance.

[0009] As a further scheme of the utility model: heat supply branch Ⅱ includes heat exchanger b and heat user place b, and the high temperature side outlet of low pressure steam generator is connected with the entrance of three-way valve e, and the high temperature side entrance of heat exchanger b is connected with the first outlet of three-way valve e.

[0010] As a further scheme of the utility model: refrigeration unit includes ejector b, refrigeration evaporator, throttle valve, cold user side, and the outlet of throttle valve is connected with the low temperature side entrance of refrigeration evaporator, and the low temperature side outlet of refrigeration evaporator is connected with the gas inlet of ejector b, and the liquid inlet of ejector b is connected with the second outlet of three-way valve b, and the outlet of ejector b is connected with mixer first entrance.

[0011] As a further scheme of the utility model: the outlet of mixer is connected with the high temperature side entrance of condenser, and the high temperature side outlet of condenser is connected with the entrance of three-way valve c, and the inlet of high pressure working medium pump and low pressure working medium pump is connected with the first outlet of three-way valve c respectively, and the inlet of throttle valve is connected with the second outlet of three-way valve c, and the low temperature side outlet of condenser is connected with the entrance of three-way valve d, and the first outlet of three-way valve d is connected with the low temperature side entrance of heat exchanger b.

[0012] The utility model provides a kind of high-low temperature two-stage cycle configuration waste heat recovery power cold heat combined heating system, and its beneficial effects are mainly reflected in the following several aspects:

[0013] Enhance heat source matching, improve waste heat recovery efficiency: by adopting high-low pressure two-stage cycle configuration, heat source and system are subjected to two heat exchanges, effectively reduce heat exchange temperature difference, reduce system Loss, realizes the step-by-step utilization of energy, significantly improves the recovery efficiency of waste heat.

[0014] Make full use of cold source side heat, improve system overall energy efficiency: in high pressure circulation loop and refrigeration unit respectively set ejector, utilize the injection effect of high temperature and high pressure fluid to increase the recovery of heat source, simultaneously utilize the heat of condenser discharge to heat up cold source fluid, further improve the overall energy utilization efficiency of system.

[0015] Balance thermal efficiency and economic performance: by optimizing system configuration, while improving system thermal efficiency, avoid excessive increase of economic cost, realize the good balance of thermal efficiency and economic performance, enhance the market competitiveness of system.

[0016] Improve mode switching flexibility and controllability: system can be flexibly switched between heat, electricity, electric cold, electric heat and electric cold heat and other multiple operation modes according to the difference of region and season and user demand, and actively adjusts working medium flow ratio through control valve, realizes accurate regulation and control of power cold heat, widens the application range and control flexibility of system.

[0017] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0019] Figure 1 It is the structure schematic diagram of high-low temperature two-stage cycle configuration waste heat recovery power cold combined heating system.

[0020] Figure 2 It is the structure schematic diagram of high-low temperature two-stage cycle configuration waste heat recovery power cold combined heating system in heat mode.

[0021] Figure 3is the structural schematic view of the high-low temperature bipolar cycle configuration waste heat recovery power and cold combined supply system in the electric mode.

[0022] Figure 4 is the structural schematic view of the high-low temperature bipolar cycle configuration waste heat recovery power and cold combined supply system in the electric and cold mode.

[0023] Figure 5 is the structural schematic view of the high-low temperature bipolar cycle configuration waste heat recovery power and cold combined supply system in the electric and heat mode.

[0024] Figure 6 is the structural schematic view of the high-low temperature bipolar cycle configuration waste heat recovery power and cold combined supply system in the electric and cold and heat mode.

[0025] In the figure: 1, three-way valve a, 2, heat exchanger a, 3, heat user place a, 4, high-pressure superheater, 5, high-pressure evaporator, 6, high-pressure preheater, 7, ejector a, 8, high-pressure turbine, 9, high-pressure generator, 10, high-pressure working medium pump, 11, low-pressure steam generator, 12, gas-liquid separator, 13, three-way valve b, 14, low-pressure turbine, 15, low-pressure generator, 16, mixer, 17, condenser, 18, low-pressure working medium pump, 19, three-way valve c, 20, three-way valve d, 21, ejector b, 22, refrigeration evaporator, 23, throttle valve, 24, cold user place, 25, three-way valve e, 26, heat exchanger b, 27, heat user place b. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be described clearly and completely below, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0027] Please refer to Figures 1-6The utility model embodiment, a kind of high-low temperature double-stage cycle configuration waste heat recovery power cold heat combined supply system, including heat source, high-pressure circulation loop, low-pressure circulation loop, heat supply branch I, heat supply branch II, refrigeration unit, three-way valve a, three-way valve b, three-way valve c, three-way valve d, three-way valve e, condenser and mixer;Wherein, heat source is communicated with heat supply branch I and high-pressure circulation loop by three-way valve a;The bottom end of the gas-liquid separator of low-pressure circulation loop is communicated with high-pressure circulation loop and refrigeration unit by three-way valve b;The high-temperature side outlet of condenser is communicated with high-pressure circulation loop, low-pressure circulation loop and refrigeration unit by three-way valve c;The low-temperature side outlet of condenser is communicated with heat supply branch II by three-way valve d;The outlet of low-pressure steam generator of low-pressure circulation loop is communicated with heat supply branch II by three-way valve e;The high-pressure turbine outlet of high-pressure circulation loop, the low-pressure turbine outlet of low-pressure circulation loop and the outlet of refrigeration unit ejector b are communicated with mixer respectively;High-pressure circulation loop, low-pressure circulation loop and refrigeration unit share condenser.

[0028] Heat supply branch I includes heat exchanger a2 and heat user a3, and the inlet of heat exchanger a2 is connected with the first outlet of three-way valve a1, when the system is used, heat source enters heat exchanger a2 through the inlet of three-way valve a1 and releases heat, and after cooling, it is discharged from waste heat outlet, and cold water enters from the low-temperature side of heat exchanger a2 and absorbs heat, and hot water after heating is discharged from the low-temperature side outlet of heat exchanger a2 and enters heat user a3, to meet the demand of heat energy.

[0029] The high pressure cycle loop comprises a high pressure working fluid pump 10, a high pressure preheater 6, a high pressure evaporator 5, a high pressure superheater 4, an ejector a7, a high pressure turbine 8 and a high pressure generator 9. The high temperature side inlet of the high pressure superheater 4 is connected to the second outlet of the three-way valve al, the high temperature side outlet of the high pressure superheater 4 is connected to the high temperature side inlet of the high pressure evaporator 5, the high temperature side outlet of the high pressure evaporator 5 is connected to the high temperature side inlet of the high pressure preheater, the outlet of the high pressure working fluid pump 10 is connected to the low temperature side inlet of the high pressure preheater 6, the low temperature side outlet of the high pressure preheater 6 is connected to the low temperature side inlet of the high pressure evaporator 5, the low temperature side outlet of the high pressure evaporator 5 is connected to the suction inlet of the ejector a7, the outlet of the ejector a7 is connected to the low temperature side inlet of the high pressure superheater 4, the liquid inlet of the ejector a7 is connected to the first outlet of the three-way valve bl3, the low temperature side outlet of the high pressure superheater 4 is connected to the inlet of the high pressure turbine 8, the output of the high pressure turbine 8 is connected to the input of the high pressure generator 9, and the outlet of the high pressure turbine 8 is connected to the third inlet of the mixer 16. During operation, the organic working fluid pressurized by the high pressure working fluid pump 10 enters the high pressure preheater 6 and the high pressure evaporator 5 in sequence. The organic working fluid absorbs heat in the high pressure evaporator 5 and is converted into high temperature and high pressure steam, which then enters the ejector a7 as working fluid. A portion of the low pressure liquid organic working fluid discharged from the bottom of the gas-liquid separator 12 enters the ejector a7 as motive fluid through the three-way valve bl3. The two streams of fluid mix in the ejector a7 and are discharged from the outlet thereof, and then enter the high pressure superheater 4 for further heating. The superheated organic steam enters the high pressure turbine 8, expands to do work, drives the high pressure generator 9 to output electrical energy, and the exhaust steam discharged from the outlet of the high pressure turbine 8 enters the mixer 16 through the third inlet thereof.

[0030] The low pressure cycle loop includes a low pressure working fluid pump 18, a low pressure steam generator 11, a gas-liquid separator 12, a low pressure turbine 14 and a low pressure generator 15. The high temperature side inlet of the low pressure steam generator 11 is connected with the high temperature side outlet of the high temperature preheater of the high pressure cycle loop, the outlet of the low pressure working fluid pump 18 is connected with the low temperature side inlet of the low pressure steam generator 11, the low temperature side outlet of the low pressure steam generator 11 is connected with the inlet of the gas-liquid separator 12, the liquid outlet of the gas-liquid separator 12 is connected with the inlet of the three-way valve b13, the gas outlet of the gas-liquid separator 12 is connected with the inlet of the low pressure turbine 14, the output end of the low pressure turbine 14 is connected with the input end of the low pressure generator 15, and the outlet of the low pressure turbine 14 is connected with the second inlet of the mixer 16. In the working process of the system, the low pressure liquid organic working fluid is discharged from the outlet of the low pressure working fluid pump 18 after being pressurized, then enters the low pressure steam generator 11 to be converted into a two-phase state working fluid after absorbing heat, is discharged from the outlet of the low pressure steam generator 11 to enter the gas-liquid separator 12, and the saturated steam discharged from the top of the gas-liquid separator 12 enters the low pressure turbine 14 to expand and do work. The low pressure turbine 14 drives the low pressure generator 15 to output electric energy through the shaft coupling, and the exhaust steam discharged from the outlet of the low pressure turbine 14 enters the mixer 16 through the second inlet of the mixer 16.

[0031] The heat supply branch II includes a heat exchanger b26 and a heat user side b27. The high temperature side outlet of the low pressure steam generator 11 is connected with the inlet of the three-way valve e25, the high temperature side inlet of the heat exchanger b26 is connected with the first outlet of the three-way valve e25, the waste heat discharged from the outlet of the low pressure steam generator 11 enters the high temperature side of the heat exchanger b26 through the first outlet of the three-way valve e25 to release heat, and is discharged from the waste heat outlet c. The cold water enters the low temperature side of the condenser 17, is heated to be warmed up in the condenser 17, is discharged from the outlet of the condenser 17, enters the heat exchanger b26 through the three-way valve d20 to absorb heat and be warmed up again, and then enters the heat user side b27 to meet the heat energy demand.

[0032] The refrigeration unit includes an ejector b21, a cooling evaporator 22, a throttle valve 23, and a cold user side 24. The outlet of the throttle valve 23 is connected to the low-temperature side inlet of the cooling evaporator 22, which is connected to the air inlet of the ejector b21. The liquid inlet of the ejector b21 is connected to the second outlet of the three-way valve b13. The outlet of the ejector b21 is connected to the first inlet of the mixer 16. During operation, the organic working fluid enters the throttle valve 23, expands and decompresses, and is discharged from its outlet. It then enters the low-temperature side of the cooling evaporator 22, absorbs heat there, and is converted into low-pressure saturated working fluid vapor before being discharged from its low-temperature side outlet. It then enters the ejector b21 as an ejector fluid. Another portion of the liquid organic working fluid discharged from the bottom of the gas-liquid separator 12 enters the ejector b21 as the working fluid through the second outlet of the three-way valve b13. The two fluids mix in the ejector b21. High-temperature air enters from the high-temperature side of the refrigeration evaporator 22, releases heat in the refrigeration evaporator 22, and the cooled air is discharged from the outlet of the refrigeration evaporator 22 and enters the cold user 24 to meet the cold energy demand.

[0033] The exhaust steam from the high-pressure turbine 8 outlet, the exhaust steam from the low-pressure turbine 14 outlet, and the fluid from the ejector b21 are mixed in the mixer 16, then cooled into a liquid working medium in the condenser 17. After passing through the three-way valve c19, the liquid working medium enters the low-pressure working medium pump 18, the high-pressure working medium pump 10, and the throttle valve 23, completing one cycle.

[0034] The working principle of this utility model is:

[0035] The system has three operating modes: heating mode, electric mode, electric cooling mode, electric heating mode, and electric heating and cooling mode. Switching between the various modes of the system is achieved by adjusting three-way valves a1, b13, e25, c19, and d20.

[0036] Thermal mode: When the waste heat inlet temperature is lower than 65°C, the waste heat is insufficient for power generation and is only used for heating. When the system is in thermal mode, the second outlet of the three-way valve a1 is closed. Specifically, Figure 2 As shown (black lines indicate connection, gray lines indicate disconnection), heat source water enters through three-way valve a1, passes through its second outlet, and enters heat exchanger a2. After releasing heat and cooling, it enters waste heat outlet a from the high-temperature side of heat exchanger a2 and is discharged. Cold water enters heat exchanger a2, absorbs heat from the heat source, and then heats up, supplying hot water to heat user a3. Adjusting the opening of three-way valve a1 controls the flow of heat source water into heat exchanger a2, thereby adjusting the amount of heat energy output.

[0037] Electric mode: when the waste heat inlet temperature is higher than 65℃, the waste heat can be used to transform into high quality electric energy. When the system is in electric mode, the first outlet of three-way valve a, the second outlet of three-way valve b, the second outlet of three-way valve c, the first outlet of three-way valve e and the first outlet of three-way valve d are closed. Specifically, as shown in Figure 3 the black line represents being connected, and the gray line represents not being connected), the waste heat enters the high-pressure superheater 4 in the high-pressure circulation loop through the three-way valve a1 to release heat, then enters the high-pressure evaporator 5, and then enters the high-pressure preheater 6. The cooled heat source is discharged from the outlet of the high-pressure preheater 6 and then enters the low-pressure steam generator 11 in the low-pressure circulation loop to further release heat, and then is discharged from the waste heat outlet b through the second outlet of the three-way valve e25. In the high-pressure circulation loop, the organic working medium is pressurized in the high-pressure working medium pump 10 and then enters the low-temperature side of the high-pressure preheater 6, is preheated and then enters the high-pressure evaporator 5, absorbs heat in the high-pressure evaporator 5, and is then transformed into high-temperature and high-pressure steam. The steam then enters the ejector a7 as working fluid. The low-pressure liquid organic working medium discharged from the bottom of the gas-liquid separator 12 enters the ejector a7 as motive fluid through the first outlet of the three-way valve b13. The two fluids are mixed in the ejector a7 to form high-temperature and high-pressure fluid, which can improve the utilization of the heat source and increase the flow of superheated steam. The steam discharged from the outlet of the ejector a7 is heated again in the high-pressure superheater 4, and the superheated organic steam enters the high-pressure turbine 8 to expand and do work, driving the high-pressure generator 9 to output electric energy. In the low-pressure circulation loop, the low-pressure liquid organic working medium is pressurized in the working medium pump 18 and then discharged from the outlet thereof, enters the low-pressure steam generator 11 to absorb heat and is then transformed into two-phase working medium, enters the gas-liquid separator 12, and then enters the low-pressure turbine 14 to expand and do work. The low-pressure turbine 14 drives the low-pressure generator 15 to output electric energy through the shaft coupling. The exhaust steam from the outlet of the high-pressure turbine 8 of the high-pressure circulation loop and the exhaust steam from the outlet of the low-pressure turbine 14 of the low-pressure circulation loop are mixed in the mixer 16, then enter the condenser 17 to be cooled into liquid working medium, and then enter the low-pressure working medium pump 18 of the low-pressure circulation loop and the high-pressure working medium pump 10 of the high-pressure circulation loop through the first outlet of the three-way valve c19, thereby completing one cycle. The high-low pressure two-stage circulation configuration of the system can reduce the heat exchange temperature difference and is conducive to the cascade utilization of energy.

[0038] Electric cold mode: when the waste heat inlet temperature is higher than 65℃, the system can simultaneously meet the electric and cold demands. When the system is in electric cold mode, the first outlet of three-way valve a, the first outlet of three-way valve e and the first outlet of three-way valve d are closed, and the first and second outlets of three-way valve b and the first and second outlets of three-way valve c are opened. Specifically, as shown in Figure 4As shown (the black route indicates connection, and the gray route indicates disconnection), the path of the waste heat is the same as the path of the waste heat in the system electric mode, and the high and low pressure circulation loops in the system electric cooling mode are the same as the high and low pressure circulation loops in the system electric mode. In the refrigeration unit, the liquid organic working medium is expanded and decompressed in the throttle valve 23 and discharged from its outlet, then enters the low-temperature side of the refrigeration evaporator 22, absorbs heat from the air in the refrigeration evaporator 22, is converted into low-pressure saturated working medium vapor, and is discharged from its low-temperature side outlet, then enters the ejector b21 as an induced fluid, and another part of the liquid organic working medium discharged from the bottom of the gas-liquid separator 12 enters the ejector b21 as the working fluid through the second outlet of the three-way valve b13. The two fluids are mixed in the ejector b21 and discharged from its outlet, then enter the mixer 16, and are mixed with the exhaust steam from the high-pressure turbine 8 outlet of the high-pressure circulation loop and the exhaust steam from the low-pressure turbine 14 outlet of the low-pressure circulation loop in the mixer 16, then enters the condenser 17 to be cooled into liquid working medium, and the liquid working medium enters the low-pressure working medium pump 18 of the low-pressure circulation loop and the high-pressure working medium pump 10 of the high-pressure circulation loop through the first outlet of the three-way valve c19 respectively, and enters the throttle valve 23 of the refrigeration unit from the second outlet of the three-way valve c19, thus completing one cycle. In the refrigeration unit, high-temperature air enters the high-temperature side of evaporator 22, releases heat there, and then exits through the high-temperature outlet of evaporator 22 before entering cold user 24, meeting cooling energy demand. By adjusting the openings of three-way valves b13 and c19, the flow of liquid working fluid into ejector b21 and throttle valve 23 can be controlled, thereby adjusting the amount of electrical energy and cooling energy output.

[0039] Electric heating mode: When the waste heat inlet temperature is higher than 65℃, the system can meet both electricity and heat requirements. When the system is in electric heating mode, close the first outlet of three-way valve a1, the second outlet of three-way valve b13, the second outlet of three-way valve c19, the second outlet of three-way valve d20 and the second outlet of three-way valve e25. Figure 5 As shown (black lines indicate connection, gray lines indicate disconnection), waste heat flows through three-way valve a1 into the high-pressure superheater 4 of the high-pressure circulation loop, releasing heat. It then flows sequentially into the high-pressure evaporator 5 and high-pressure preheater 6. After exiting the high-pressure preheater 6 outlet, it enters the low-pressure steam generator 11 of the low-pressure circulation loop, releasing further heat. It then flows through the first outlet of three-way valve e25 and is discharged through waste heat outlet c. The high- and low-pressure circulation loops are identical to those in the system's electrical mode. In heating branch II, chilled water absorbs heat in condenser 17, raising its temperature. It then flows through the first outlet of three-way valve d20 into heat exchanger b26, where it absorbs heat again and rises in temperature. High-temperature hot water is then supplied to heat user b27. By adjusting the openings of three-way valves d20 and e25, the cooling water flow rate and waste heat energy flowing into heat exchanger 26 can be controlled, thereby adjusting the amount of heat output.

[0040] Electric cooling and heating mode: When the waste heat inlet temperature is higher than 65°C, the system can meet the electricity, cooling and heating needs at the same time. When the system is in electric cooling and heating mode, close the first outlet of the three-way valve a1, the second outlet of the three-way valve d20 and the second outlet of the three-way valve e25, and open the first and second outlets of the three-way valve b13 and the first and second outlets of the three-way valve c19. Figure 6 As shown (black lines indicate connection), waste heat enters the high-pressure superheater 4 of the high-pressure circulation loop through the second outlet of three-way valve a1, releasing heat. It then enters the high-pressure evaporator 5 and then the high-pressure preheater 6. After being discharged from the outlet of the high-pressure preheater 6, it enters the low-pressure steam generator 11 of the low-pressure circulation loop, where it further releases heat. It is then discharged through the first outlet of three-way valve e25 and discharged at waste heat outlet c. The high and low pressure circulation loops are identical to those in the system's electric mode, the refrigeration circuit is identical to that in the system's electric cooling mode, and heating branch II is identical to that in the system's electric heating mode. By adjusting the opening of the three-way valve b13, the flow rate of the working medium flowing into the ejector b21 can be controlled. By adjusting the opening of the three-way valve c19, the flow rate of the working medium flowing into the throttle valve 23 can be controlled. By adjusting the three-way valve d20, the flow rate of cooling water flowing into the heat exchanger 26 can be controlled. By adjusting the opening of the three-way valve e25, the waste heat energy flowing into the heat exchanger 26 can be controlled, thereby achieving the goal of adjusting the output amount of electrical energy, cold energy and heat energy.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A high-low temperature two-stage cycle configuration waste heat recovery power and cold heat combined supply system, characterized in that, The heat source, the high-pressure circulation loop, the low-pressure circulation loop, the heat supply branch I, the heat supply branch II, the refrigeration unit, three-way valve a, three-way valve b, three-way valve c, three-way valve d, three-way valve e, the condenser and the mixer are connected in series. The heat source is connected with the heat supply branch I and the high-pressure circulation loop through three-way valve a; the bottom end of the gas-liquid separator of the low-pressure circulation loop is connected with the high-pressure circulation loop and the refrigeration unit through three-way valve b; the high-temperature side outlet of the condenser is connected with the high-pressure circulation loop, the low-pressure circulation loop and the refrigeration unit through three-way valve c; the low-temperature side outlet of the condenser is connected with the heat supply branch II through three-way valve d; the outlet of the low-pressure steam generator of the low-pressure circulation loop is connected with the heat supply branch II through three-way valve e; the high-pressure turbine outlet of the high-pressure circulation loop, the low-pressure turbine outlet of the low-pressure circulation loop and the outlet of the ejector b of the refrigeration unit are connected with the mixer respectively; the high-pressure circulation loop, the low-pressure circulation loop and the refrigeration unit share the condenser.

2. The high-low temperature two-stage cycle configuration waste heat recovery combined cooling and heating system according to claim 1, characterized in that: The heat supply branch I comprises a heat exchanger a and a heat user site a, and the heat exchanger a is connected with the inlet of the heat source through the first outlet of three-way valve a.

3. The high-low temperature two-stage cycle configuration waste heat recovery combined cooling and heating system according to claim 2, characterized in that: The high-pressure circulation loop comprises a high-pressure working medium pump, a high-pressure preheater, a high-pressure evaporator, a high-pressure superheater, an ejector a, a high-pressure turbine and a high-pressure generator; the heat source is connected with the high-temperature side inlet of the high-pressure superheater through the second outlet of three-way valve a, and then sequentially passes through the high-temperature side of the high-pressure evaporator and the high-temperature preheater; the outlet of the high-pressure working medium pump is connected with the low-temperature side inlet of the high-pressure preheater, the outlet of the low-temperature side of the high-pressure preheater is connected with the low-temperature side inlet of the high-pressure evaporator, the right side inlet of the ejector a is connected with the low-temperature side outlet of the high-pressure evaporator, the bottom inlet of the ejector a is connected with the bottom outlet of the gas-liquid separator of the low-pressure circulation loop through the first outlet of three-way valve b, the outlet of the ejector a is connected with the low-temperature side inlet of the high-pressure superheater, the low-temperature side outlet of the high-pressure superheater is connected with the inlet of the high-pressure turbine, the high-pressure turbine and the high-pressure generator are connected through a shaft coupling, and the outlet of the high-pressure turbine is connected with the third inlet of the mixer.

4. The high-low temperature two-stage cycle configuration waste heat recovery combined cooling and heating system according to claim 3, characterized in that: The low-pressure circulation loop comprises a low-pressure working medium pump, a low-pressure steam generator, a gas-liquid separator, a low-pressure turbine and a low-pressure generator; the high-temperature side inlet of the low-pressure steam generator is connected with the high-temperature side outlet of the high-temperature preheater of the high-pressure circulation loop, the outlet of the low-pressure working medium pump is connected with the low-temperature side inlet of the low-pressure steam generator, the low-temperature side outlet of the low-pressure steam generator is connected with the inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected with the inlet of three-way valve b, the gas outlet of the gas-liquid separator is connected with the inlet of the low-pressure turbine, the output end of the low-pressure turbine is connected with the input end of the low-pressure generator, and the outlet of the low-pressure turbine is connected with the second inlet of the mixer.

5. The high-low temperature two-stage cycle configuration waste heat recovery combined cooling and heating system according to claim 4, characterized in that: The heat supply branch II comprises a heat exchanger b and a heat user site b; the high-temperature side outlet of the low-pressure steam generator is connected with the inlet of three-way valve e, and the high-temperature side inlet of the heat exchanger b is connected with the first outlet of three-way valve e.

6. The high-low temperature two-stage cycle configuration waste heat recovery combined cooling and heating system according to claim 5, characterized in that: The refrigeration unit comprises an ejector b, a refrigeration evaporator, a throttling valve, a cold user side, the outlet of the throttling valve is connected with the low-temperature side inlet of the refrigeration evaporator, the low-temperature side outlet of the refrigeration evaporator is connected with the gas inlet of the ejector b, the liquid inlet of the ejector b is connected with the second outlet of the three-way valve b, and the outlet of the ejector b is connected with the first inlet of the mixer.

7. The high-low temperature two-stage cycle configuration waste heat recovery combined cooling and heating system according to claim 6, characterized in that: The outlet of the mixer is connected with the high-temperature side inlet of the condenser, the high-temperature side outlet of the condenser is connected with the inlet of the three-way valve c, the inlets of the high-pressure working medium pump and the low-pressure working medium pump are respectively connected with the first outlet of the three-way valve c, the inlet of the throttling valve is connected with the second outlet of the three-way valve c, the low-temperature side outlet of the condenser is connected with the inlet of the three-way valve d, and the first outlet of the three-way valve d is connected with the low-temperature side inlet of the heat exchanger b.

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