A device and method for utilizing waste incineration waste heat for combined cooling, heating and power generation

Abstract

The present invention provides a device and method for utilizing waste incineration waste heat for trigeneration of cooling, heating and electricity, including a waste incinerator, wherein the waste incinerator is provided with a domestic waste inlet and an air inlet; the waste incinerator is provided with a high-temperature flue gas outlet and a high-temperature slag outlet, wherein the high-temperature slag outlet and the high-temperature flue gas outlet are both connected to a steam Rankine cycle system; the low-temperature gas outlet provided on the steam Rankine cycle system is connected to the gas inlet of an organic Rankine cycle system; the waste heat outlets of the steam Rankine cycle system and the organic Rankine cycle system are also connected to a heat exchange unit for exchanging heat with return water from a heat network; the low-temperature gas outlet of the heat exchange unit is connected to a refrigeration device; the present invention recovers the heat in the slag and flue gas at the bottom of the incinerator of a waste incineration power plant through a multi-stage heat recovery unit, and then generates electricity through a steam Rankine cycle and an organic Rankine cycle, thereby improving the output power of the waste incineration power plant.

Description

Technical Field

[0001] The present invention belongs to the field of waste incineration power generation, and in particular relates to a waste incineration waste heat utilization device and method for combined cooling, heating and electricity generation. Background Art

[0002] Landfill used to be the main way to deal with garbage. Its advantages are simple operation and low cost. Its disadvantage is that it occupies a large area. In the long run, the leachate generated during the landfill process is difficult to deal with and will cause pollution of the land and groundwater resources in the area. With the advancement of urbanization, the pressure on landfill is increasing.

[0003] Waste incineration power generation is to release the chemical energy stored in domestic waste through incineration, convert it into heat energy and use it. Compared with landfill, the pollutant gas emissions generated by waste incineration are much lower. At the same time, the electricity and heat generated can also reduce the consumption of non-renewable energy, achieve energy conservation and emission reduction, and is gradually becoming the mainstream of urban domestic waste treatment in my country.

[0004] Although incineration has significant advantages in the harmless treatment of urban domestic waste, there are also some key issues to be resolved. The most widespread problem is that the overall energy efficiency of waste incineration power plants is low, and there is a large loss of low-grade energy, mainly due to the heat loss of boiler combustion and the low-temperature heat loss of exhaust gas. In addition, the bottom ash particles at the bottom of the incinerator of the waste incineration power plant also contain a large amount of waste heat energy, but current waste incineration power plants rarely use this part of heat. Waste heat recovery and utilization needs to consider the regional energy product needs, because waste heat resources can not only be used for power generation, but also for regional heating, providing domestic hot water, and providing cold energy through refrigeration technology. Summary of the invention

[0005] The purpose of the present invention is to provide a waste incineration waste heat utilization device and method for trigeneration of cooling, heating and electricity, which solves the defects that the prior art does not utilize the heat in the slag at the bottom of the incinerator of a waste incineration power plant, but only utilizes the waste heat in the flue gas, and the existing waste incineration devices are generally used for power supply and cannot provide cooling or heating.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a waste incineration waste heat utilization device for trigeneration of cooling, heating and electricity, comprising a waste incinerator, wherein the waste incinerator is provided with a domestic waste inlet and an air inlet; the waste incinerator is provided with a high-temperature flue gas outlet and a high-temperature slag outlet, wherein the high-temperature slag outlet and the high-temperature flue gas outlet are both connected to a steam Rankine cycle system;

[0008] The low-temperature gas outlet provided on the steam Rankine cycle system is connected to the gas inlet of the organic Rankine cycle system;

[0009] The waste heat outlets of the steam Rankine cycle system and the organic Rankine cycle system are also connected to a heat exchange unit for exchanging heat with return water from the heating network;

[0010] The low-temperature gas outlet of the heat exchange unit is connected to a refrigeration device.

[0011] Preferably, the steam Rankine cycle system comprises a slag waste heat boiler, a flue gas waste heat boiler, a first steam turbine and a third steam turbine, wherein the high-temperature slag outlet is connected to a slag inlet provided on the slag waste heat boiler, and the superheated steam outlet provided on the slag waste heat boiler is connected to a steam inlet of the first steam turbine;

[0012] The high-temperature flue gas outlet is connected to the flue gas inlet of the flue gas waste heat boiler, and the superheated steam outlet provided on the flue gas waste heat boiler is connected to the third steam turbine;

[0013] The exhaust steam outlet provided on the first steam turbine and the exhaust steam outlet provided on the third steam turbine are both connected to the gas inlet of the organic Rankine cycle system.

[0014] Preferably, a circulating water outlet provided on the organic Rankine cycle system is connected to a circulating water inlet provided on the slag waste heat boiler.

[0015] Preferably, the exhaust steam outlet on the third steam turbine is connected to the exhaust steam inlet of the first condenser, and the condensed water outlet provided on the first condenser is connected to the circulating water inlet provided on the flue gas waste heat boiler.

[0016] Preferably, the organic Rankine cycle system comprises a first heat exchanger, a second heat exchanger and a second steam turbine, wherein the gas inlet on the first heat exchanger and the gas inlet on the second heat exchanger are both connected to the gas outlet provided on the steam Rankine cycle system; the organic working fluid outlet provided on the first heat exchanger is connected to the organic working fluid inlet provided on the second heat exchanger; the superheated steam outlet provided on the second heat exchanger is connected to the steam inlet provided on the second steam turbine, and the exhaust steam outlet provided on the second steam turbine is connected to the organic working fluid inlet of the first heat exchanger through a third condenser.

[0017] Preferably, the low-temperature gas outlet provided on the first heat exchanger and the low-temperature gas outlet provided on the second heat exchanger are both connected to a heat exchange unit.

[0018] Preferably, the heat exchange unit comprises a third heat exchanger, a fourth heat exchanger and a fifth heat exchanger, wherein the low-temperature slag outlet on the slag waste heat boiler of the steam Rankine cycle system is connected to the slag inlet of the third heat exchanger; a heat network return water pipeline is arranged on the third heat exchanger; the heat network return water outlet of the third heat exchanger is connected to the heat network water supply equipment through the fourth heat exchanger and the fifth heat exchanger in sequence;

[0019] The fourth heat exchanger and the fifth heat exchanger are respectively connected to the first heat exchanger and the second heat exchanger of the organic Rankine cycle system.

[0020] Preferably, the refrigeration equipment includes a refrigerator, and the refrigerator is provided with a cooling return water inlet and a flue gas inlet, wherein the low-temperature flue gas outlet of the fifth heat exchanger is connected to the flue gas inlet, and the refrigerator is provided with a cooling water outlet.

[0021] A method for utilizing waste incineration waste heat for combined cooling, heating and electricity generation comprises the following steps:

[0022] Domestic garbage enters the garbage incinerator and burns with the help of air, producing high-temperature slag and high-temperature flue gas;

[0023] The obtained high-temperature flue gas and high-temperature slag are used to generate electricity using a steam Rankine cycle system;

[0024] The low temperature gas produced by the steam Rankine cycle system is used to generate electricity using the organic Rankine cycle system;

[0025] The low-temperature slag produced by the steam Rankine cycle and the low-temperature flue gas produced by the organic Rankine cycle are used to exchange heat with the return water of the heating network and then in the heating network;

[0026] The low-temperature flue gas generated by the organic Rankine cycle is used to cool the cooling return water.

[0027] Preferably, the high-temperature slag enters the slag waste heat boiler to exchange heat with the circulating water, and the cooled slag enters the third heat exchanger to continue to exchange heat with the heat network return water before being discharged;

[0028] The heated heat network return water enters the fourth heat exchanger;

[0029] The circulating water receives the heat from the high-temperature slag and is heated to form superheated steam, which is then sent to the first steam turbine to generate power. The exhaust steam after the work enters the first heat exchanger to exchange heat with the circulating organic working medium. The cooled exhaust steam then enters the fourth heat exchanger to continue to exchange heat with the heated heat network return water to form condensed water. The obtained condensed water continues to return to the slag waste heat boiler to complete the steam Rankine cycle.

[0030] The circulating organic working medium is heated up after heat exchange with exhaust steam in the first heat exchanger, and then enters the second heat exchanger to exchange heat with the cooled flue gas and exhaust gas to evaporate into steam, and then enters the second steam turbine to generate power. The organic working medium steam after work is condensed into liquid through the second condenser, completing the organic Rankine cycle.

[0031] The flue gas exhaust from the incinerator enters the flue gas waste heat boiler to exchange heat with the circulating water for cooling, then enters the second heat exchanger to exchange heat with the organic working fluid, then enters the fifth heat exchanger to exchange heat with the return water of the heat network for cooling, and then enters the refrigerator to drive the refrigeration mechanism to extract cooling capacity;

[0032] The circulating water generates superheated steam in the flue gas waste heat boiler, enters the third steam turbine to generate power, and the exhaust steam enters the first condenser to condense into water and then returns to the flue gas waste heat boiler to complete the cycle;

[0033] The return water from the heating network is heated up by the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger in sequence and then returns to the heating network for utilization.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a waste incineration waste heat utilization device and method for combined cooling, heating and electricity. The present invention simultaneously recovers and utilizes the heat in the slag and flue gas at the bottom of the incinerator of the waste incineration power plant through multi-stage heat recovery, generates electricity through steam Rankine cycle and organic Rankine cycle, and improves the output power of the waste incineration power plant. The low-temperature slag after heat recovery by the waste heat boiler, the low-level heat of the turbine exhaust steam and flue gas in the steam Rankine cycle are fully recovered by using the return water of the heat network, and the return water of the heat network is heated and sent back to the heat network, which can increase the heat supply of the power plant. The heat of the low-temperature flue gas is used to produce cooling capacity to realize the combined cooling, heating and electricity of the power plant.

[0036] Furthermore, the output power and energy utilization efficiency of the waste incineration power plant are improved through the cascade recovery of flue gas and slag heat and the matching and coupling between heat of different grades.

[0037] Furthermore, by using waste heat boilers to recover slag heat for steam Rankine cycle power generation and heat network return water to secondary recover slag heat, the cooling water consumption in the conventional slag treatment process is greatly reduced.

[0038] Furthermore, by recovering the heat of low-temperature slag, exhaust steam from turbine and low-temperature flue gas through return water from the heat network, the heat supply and heating income of the power plant are increased, thereby improving the economic benefits of the power plant.

[0039] Furthermore, by utilizing low-temperature flue gas to drive the refrigeration mechanism for cooling, trigeneration of heat, cooling and electricity can be achieved, thereby increasing the cooling revenue for the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1It is a system structure diagram provided by the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] like Figure 1 As shown, a waste incineration waste heat utilization device for trigeneration of cooling, heating and electricity provided by the present invention comprises a waste incinerator 1, a slag waste heat boiler 2, a first steam turbine 3, a second steam turbine 4, a third steam turbine 5, a flue gas waste heat boiler 6, a condenser 7, a first heat exchanger 8, a second heat exchanger 9, a third heat exchanger 10, a fourth heat exchanger 11, a fifth heat exchanger 12, a condenser 13, a refrigerator 14, domestic waste 15, air 16, high-temperature flue gas 17, high-temperature slag 18, heat network return water 19, cooling return water 20, circulating water 21, superheated steam 22, circulating water 23 and circulating organic working medium 24, wherein a domestic waste inlet and an air inlet are provided on the waste incinerator 1, and the high-temperature flue gas outlet provided on the waste incinerator 1 is connected to the high-temperature flue gas inlet of the flue gas waste heat boiler 6; the high-temperature slag outlet provided on the waste incinerator 1 is connected to the slag inlet of the slag waste heat boiler 2.

[0043] The slag waste heat boiler 2 is provided with a circulating water inlet; the superheated steam outlet provided on the slag waste heat boiler 2 and the superheated steam inlet provided on the first steam turbine 3 are provided.

[0044] A low-temperature slag outlet is arranged on the slag waste heat boiler 2 and a low-temperature inlet is arranged on the third heat exchanger 10; a high-temperature inlet is arranged on the third heat exchanger 10, and the high-temperature outlet of the third heat exchanger 10 is connected to the high-temperature inlet of the fourth heat exchanger 11, and the high-temperature outlet on the third heat exchanger is connected to the heat network return water 19.

[0045] The third heat exchanger 10 is provided with a slag outlet.

[0046] The high-temperature outlet of the fourth heat exchanger 11 is connected to the high-temperature inlet of the fifth heat exchanger 12 .

[0047] The circulating water outlet provided on the fifth heat exchanger 12 is connected to the circulating water inlet provided on the refrigerator 14 , the refrigerator is provided with a flue gas inlet and a cooling return water inlet, and the refrigerator 14 is provided with a cooling water outlet.

[0048] The superheated steam outlet arranged on the slag waste heat boiler 2 is connected to the steam inlet arranged on the first steam turbine 3, the exhaust steam outlet arranged on the first steam turbine 3 is connected to the exhaust steam inlet of the first heat exchanger 8, and the low-temperature gas outlet arranged on the first heat exchanger 8 is connected to the steam inlet of the fourth heat exchanger 11.

[0049] The condensed water outlet arranged on the fourth heat exchanger 11 is connected to the circulating water inlet of the slag waste heat boiler 2 .

[0050] The organic working medium outlet provided on the third heat exchanger 8 is connected to the organic working medium inlet provided on the second heat exchanger 9, the superheated steam outlet provided on the second heat exchanger 9 is connected to the steam inlet provided on the second steam turbine 4, the exhaust steam outlet provided on the second steam turbine 4 is connected to the exhaust steam inlet of the second condenser 13, and the condensed water outlet provided on the second condenser 13 is connected to the organic working medium inlet provided on the first heat exchanger 8.

[0051] The low-temperature outlet provided on the second heat exchanger 9 is connected to the low-temperature inlet of the fifth heat exchanger 12, and the high-temperature hot network water supply outlet provided on the fifth heat exchanger 12 is connected to an external device.

[0052] The superheated steam outlet arranged on the flue gas waste heat boiler 6 is connected to the steam inlet of the second steam turbine 5, the exhaust steam outlet arranged on the second steam turbine 5 is connected to the exhaust steam inlet of the condenser 7, and the condensate outlet of the condenser 7 is connected to the condensate inlet arranged on the flue gas waste heat boiler 6.

[0053] The low-temperature water outlet arranged on the flue gas waste heat boiler 6 is connected to the low-temperature water inlet of the second heat exchanger 9 .

[0054] The working process of this device:

[0055] Domestic waste 15 enters the waste incinerator 1 and is burned with the assistance of air 16 to produce high-temperature slag 18 and high-temperature flue gas 17 .

[0056] The high-temperature slag 18 from the bottom of the incinerator of the waste incineration power plant enters the slag waste heat boiler 2 to exchange heat with the circulating water 21. The cooled slag enters the third heat exchanger 10 to continue to exchange heat with the heat network return water 19 before being discharged.

[0057] The heated heat network return water 19 enters the fourth heat exchanger 11 .

[0058] The circulating water 21 receives the heat from the high-temperature slag 18 to heat up and form superheated steam 22, which is sent to the first steam turbine 3 to generate power. The exhaust steam after the work enters the first heat exchanger 8 to exchange heat with the circulating organic working medium 24. The cooled exhaust steam then enters the fourth heat exchanger 11 to continue to exchange heat with the heated heat network return water to form condensed water. The obtained condensed water continues to return to the slag waste heat boiler 2 to complete the steam Rankine cycle.

[0059] The circulating organic working medium 24 is heated up after heat exchange with the exhaust steam in the first heat exchanger 8, and then enters the second heat exchanger 9 to exchange heat with the cooled flue gas and exhaust gas to evaporate into steam, and then enters the second steam turbine 4 to generate power. The organic working medium steam after work is condensed into liquid through the second condenser 13, completing the organic Rankine cycle.

[0060] The flue gas exhaust 17 discharged from the incinerator enters the flue gas waste heat boiler 6 to exchange heat with the circulating water for cooling, then enters the second heat exchanger 9 to exchange heat with the organic working fluid, then enters the fifth heat exchanger 12 to exchange heat with the heat network return water for cooling, then enters the refrigerator 14 to drive the refrigerator to extract cold energy, and finally goes to the purification device.

[0061] The circulating water 23 generates superheated steam in the flue gas waste heat boiler 6, enters the third steam turbine 5 to generate power, and the exhaust steam enters the first condenser 7 to condense into water and then returns to the flue gas waste heat boiler 6 to complete the cycle.

[0062] The return water 19 from the heating network is heated by the third heat exchanger 10, the fourth heat exchanger 11 and the fifth heat exchanger 12 and then returns to the heating network for utilization.

[0063] The cooling return water 20 enters the refrigerator 14 to extract cold energy and is then used for cooling.

[0064] The present invention simultaneously recycles the heat in the slag and flue gas at the bottom of the incinerator of the waste incineration power plant through multi-stage heat recovery, generates electricity through steam Rankine cycle and organic Rankine cycle, and improves the output power of the waste incineration power plant. The low-temperature slag after heat recovery by the waste heat boiler, the low-level heat of the steam turbine exhaust steam and flue gas in the steam Rankine cycle are fully recovered by using the return water of the heat network, and the return water of the heat network is heated and sent back to the heat network, which can increase the heat supply of the power plant. The heat of the low-temperature flue gas is used to produce cooling capacity to realize the trigeneration of cooling, heating and electricity of the power plant.

[0065] 1. The output power and energy utilization efficiency of the waste incineration power plant are improved through the cascade recovery of flue gas and slag heat and the matching and coupling between heat of different grades;

[0066] 2. By using waste heat boilers to recover slag heat for steam Rankine cycle power generation and heat network return water to secondary recovery of slag heat, the cooling water consumption in the conventional slag treatment process is greatly reduced.

[0067] 3. The heat of low-temperature slag, exhaust steam from turbine and low-temperature flue gas is recovered through the return water of the heat network, which increases the heat supply and heating income of the power plant and improves the economic benefits of the power plant.

[0068] 4. By using low-temperature flue gas to drive the refrigeration machine for cooling, the trigeneration of heat, cooling and electricity can be achieved, increasing the cooling revenue for the power plant.

[0069] The output power and energy efficiency of the waste incineration power plant are improved by the cascade recovery of flue gas and slag heat and the matching and coupling of heat of different grades. The cooling water consumption in the conventional slag treatment process is greatly reduced by using waste heat boiler to recover slag heat for steam Rankine cycle power generation and heat network return water to recover slag heat for the second time. The heat supply and heating income of the power plant are increased by recovering the heat of turbine exhaust steam and low-temperature flue gas through heat network return water, which improves the economic benefits of the power plant. By using low-temperature flue gas to drive the refrigeration mechanism for cooling, the trigeneration of cooling, heating and electricity is realized, which increases the cooling income of the power plant.

Claims

1. A waste incineration waste heat utilization device for combined cooling, heating and electricity generation, characterized in that: The waste incinerator (1) comprises a domestic waste inlet and an air inlet; the waste incinerator (1) is provided with a high-temperature flue gas outlet and a high-temperature slag outlet, wherein the high-temperature slag outlet and the high-temperature flue gas outlet are both connected to a steam Rankine cycle system; The low-temperature gas outlet provided on the steam Rankine cycle system is connected to the gas inlet of the organic Rankine cycle system; The waste heat outlets of the steam Rankine cycle system and the organic Rankine cycle system are also connected to a heat exchange unit for exchanging heat with return water from the heating network; The low-temperature gas outlet of the heat exchange unit is connected to a refrigeration device; The steam Rankine cycle system comprises a slag waste heat boiler (2), a flue gas waste heat boiler (6), a first steam turbine (3) and a third steam turbine (5), wherein the high-temperature slag outlet is connected to a slag inlet provided on the slag waste heat boiler (2), and the superheated steam outlet provided on the slag waste heat boiler (2) is connected to a steam inlet of the first steam turbine (3); The high-temperature flue gas outlet is connected to the flue gas inlet of the flue gas waste heat boiler (6), and the superheated steam outlet provided on the flue gas waste heat boiler (6) is connected to the third steam turbine (5); The exhaust steam outlet provided on the first steam turbine (3) and the exhaust steam outlet provided on the third steam turbine (5) are both connected to the gas inlet of the organic Rankine cycle system; The organic Rankine cycle system comprises a first heat exchanger (8), a second heat exchanger (9) and a second steam turbine (4), wherein the gas inlet on the first heat exchanger (8) and the gas inlet on the second heat exchanger (9) are both connected to the gas outlet provided on the steam Rankine cycle system; the organic working medium outlet provided on the first heat exchanger (8) is connected to the organic working medium inlet provided on the second heat exchanger (9); the superheated steam outlet provided on the second heat exchanger (9) is connected to the steam inlet provided on the second steam turbine (4), and the exhaust steam outlet provided on the second steam turbine (4) is connected to the organic working medium inlet of the first heat exchanger (8) through the second condenser (13); The heat exchange unit comprises a third heat exchanger (10), a fourth heat exchanger (11) and a fifth heat exchanger (12), wherein a low-temperature slag outlet on the slag waste heat boiler (2) of the steam Rankine cycle system is connected to a slag inlet of the third heat exchanger (10); a heat network return water pipeline is arranged on the third heat exchanger (10); and the heat network return water outlet of the third heat exchanger (10) is connected to a heat network water supply device through the fourth heat exchanger (11) and the fifth heat exchanger (12) in sequence; The fourth heat exchanger (11) and the fifth heat exchanger (12) are respectively connected to the first heat exchanger (8) and the second heat exchanger (9) of the organic Rankine cycle system.

2. The waste incineration waste heat utilization device for combined cooling, heating and power generation according to claim 1 is characterized in that: The circulating water outlet provided on the organic Rankine cycle system is connected to the circulating water inlet provided on the slag waste heat boiler (2).

3. The waste incineration waste heat utilization device for combined cooling, heating and power generation according to claim 1 is characterized in that: The exhaust steam outlet on the third steam turbine (5) is connected to the exhaust steam inlet of the first condenser (7), and the condensed water outlet provided on the first condenser (7) is connected to the circulating water inlet provided on the flue gas waste heat boiler (6).

4. The waste incineration waste heat utilization device for combined cooling, heating and power generation according to claim 1 is characterized in that: The low-temperature gas outlet provided on the first heat exchanger (8) and the low-temperature gas outlet provided on the second heat exchanger (9) are both connected to a heat exchange unit.

5. The waste incineration waste heat utilization device for combined cooling, heating and power generation according to claim 1 is characterized in that: The refrigeration equipment comprises a refrigerator (14), the refrigerator (14) being provided with a cooling return water inlet and a smoke inlet, wherein the low-temperature smoke outlet of the fifth heat exchanger (12) is connected to the smoke inlet, and the refrigerator (14) is provided with a cooling water outlet.

6. A method for utilizing waste heat from garbage incineration for combined cooling, heating and power generation, characterized in that: The following steps are involved: Domestic waste (15) enters a waste incinerator (1) and is burned with the aid of air (16), producing high-temperature slag (18) and high-temperature flue gas (17); The obtained high-temperature flue gas (17) and high-temperature slag (18) are used to generate electricity using a steam Rankine cycle system; The low temperature gas produced by the steam Rankine cycle system is used to generate electricity using the organic Rankine cycle system; The low-temperature slag produced by the steam Rankine cycle and the low-temperature flue gas produced by the organic Rankine cycle are used to exchange heat with the return water of the heating network; The low-temperature flue gas generated after heat exchange is used to cool the cooling return water; The high-temperature slag (18) enters the slag waste heat boiler (2) to exchange heat with the first circulating water (21), and the cooled slag enters the third heat exchanger (10) to continue to exchange heat with the heat network return water (19) before being discharged; The heated heat network return water (19) enters the fourth heat exchanger (11); The first circulating water (21) receives heat from the high-temperature slag (18) to be heated to form superheated steam (22), which is then sent to the first steam turbine (3) to generate power. The exhaust steam after the power generation enters the first heat exchanger (8) to exchange heat with the circulating organic working medium (24). The exhaust steam after cooling then enters the fourth heat exchanger (11) to continue to exchange heat with the heated heat network return water to form condensed water. The obtained condensed water is then returned to the slag waste heat boiler (2), completing the steam Rankine cycle. The circulating organic working medium (24) is heated up after heat exchange with exhaust steam in the first heat exchanger (8), then enters the second heat exchanger (9) to exchange heat with flue gas and tail gas after cooling to evaporate into steam, and then enters the second steam turbine (4) to generate power. The organic working medium steam after power generation is condensed into liquid through the second condenser (13), thus completing the organic Rankine cycle; The high-temperature flue gas (17) discharged from the incinerator enters the flue gas waste heat boiler (6) to exchange heat with circulating water for cooling, then enters the second heat exchanger (9) to exchange heat with the organic working fluid, then enters the fifth heat exchanger (12) to exchange heat with the return water of the heat network for cooling, and then enters the refrigerator (14) to drive the refrigerator to extract cooling capacity; The second circulating water (23) generates superheated steam in the flue gas waste heat boiler (6), enters the third steam turbine (5) to generate power, and the exhaust steam enters the first condenser (7) to be condensed into water and then returns to the flue gas waste heat boiler (6) to complete the cycle; The return water (19) from the heating network is heated by passing through the third heat exchanger (10), the fourth heat exchanger (11) and the fifth heat exchanger (12) in sequence and then returns to the heating network for utilization.

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