Black water flash steam waste heat co-production electric energy and cooling capacity device

Abstract

The utility model belongs to the technical field of industrial waste heat utilization and production operation, and particularly relates to a black water flash steam waste heat co-production electric energy and cooling capacity device. The device comprises a low-pressure flash tank, a low-pressure flash cooler, a flash separator, an ORC power generation system, a refrigeration cycle system, a plurality of valves and a plurality of pipelines, and can effectively recover low-temperature waste heat in black water flash steam for simultaneously producing electric energy and low-temperature cooling capacity, so that the circulating water consumption of a production device is reduced, and the operation benefit of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial waste heat utilization and production operation, and specifically relates to a black water flash steam waste heat co-generation electricity and cooling device. Background Art

[0002] In the coal gasification device, the temperature of a large amount of black water flash steam generated by the evaporation hot water tower is about 130℃, which is a low-grade heat source. In the traditional process, it is usually cooled to 40℃ by circulating water in a low-pressure flash cooler, and then enters the flash separator to separate the non-condensable gas and wastewater.

[0003] The main drawbacks of the above process and device are that circulating water is used to cool black water flash steam without effective heat recovery, a large amount of circulating water is consumed, resulting in great energy waste and increased production and operation costs. Summary of the invention

[0004] The purpose of the utility model is to address the deficiencies of the prior art and provide a black water flash steam waste heat cogeneration power and cooling device, which can effectively recover the low-temperature waste heat in the black water flash steam for simultaneous by-product power and low-temperature cooling, reducing the circulating water consumption of the production device and improving the operating efficiency of the device. In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A black water flash steam waste heat cogeneration power and cooling device, the device comprising a low-pressure flash tank, a low-pressure flash cooler, and a flash separator;

[0006] The output end of the black water flash steam pipeline from the evaporative hot water tower is connected to a low-pressure flash tank, and the low-pressure flash tank is divided into two output branches. The first branch is connected to the flash separator through a low-pressure flash cooler; the second branch is connected to the flash separator through an ORC power generation system and a refrigeration cycle system in turn.

[0007] In the technical solution of the utility model: the ORC power generation system includes a superheater, a turbine generator, a condenser 1, a circulating working fluid pump, a preheater and an evaporator 1;

[0008] The refrigeration cycle system comprises a regenerator, a second condenser, a refrigerant heat exchanger, a second evaporator, an absorber, a solution circulation pump and a solution heat exchanger.

[0009] In the technical solution of the utility model: the input end of the circulating working medium pipeline from the superheater is connected to the turbine generator, and the turbine generator is connected to the superheater through the pipeline in sequence through the condenser 1, the circulating working medium pump, the preheater, and the evaporator 1;

[0010] The circulating working fluid from the top of the regenerator is connected to the second evaporator through a pipeline, through the second condenser, the refrigerant heat exchanger, and the 5# valve in sequence; the output end of the second evaporator is connected to the refrigerant heat exchanger, the absorber, the solution circulation pump, the solution heat exchanger and the regenerator in sequence through a pipeline; the bottom output end of the regenerator is connected to the absorber through a pipeline through the solution heat exchanger.

[0011] In the technical solution of the utility model: the second branch is connected to the input end pipeline of the flash separator through the superheater, the evaporator, the preheater, the regenerator in sequence.

[0012] In the technical scheme of the utility model: the output end of the black water flash steam pipeline from the evaporative hot water tower is connected to the low-pressure flash tank, and the low-pressure flash tank is divided into two output branches. The first branch is connected to the input end pipeline of the flash separator after passing through the 1# valve, the low-pressure flash cooler and the 2# valve in sequence; the second branch is connected to the input end pipeline of the flash separator after passing through the 3# valve, the superheater, the evaporator, the preheater, the regenerator and the 4# valve in sequence.

[0013] Beneficial effects of the utility model: low-pressure flash tank, low-pressure flash cooler, flash separator, ORC power generation system, refrigeration cycle system and several valves and pipelines can effectively recover low-temperature waste heat in black water flash steam for simultaneous by-product electricity and low-temperature cooling, thereby reducing circulating water consumption of the production device and improving the operating efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the process of the utility model.

[0015] In the figure: 1- low-pressure flash tank, 2- low-pressure flash cooler, 3- flash separator, 4- ORC power generation system, 401- superheater, 402- turbine generator, 403- condenser 1, 404- circulating working fluid pump, 405- preheater, 406- evaporator 1, 5- ORC power generation system, 501- regenerator, 502 condenser 2, 503- refrigerant heat exchanger, 504- evaporator 2, 505- absorber, 506- solution circulation pump, 507- solution heat exchanger, V1- 1# valve, V2- 2# valve, V3- 3# valve, V4- 4# valve, V5- 5# valve. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the embodiments, but the protection scope of the present invention is not limited thereto:

[0017] like Figure 1As shown, a black water flash steam waste heat cogeneration power and cooling device includes a low-pressure flash tank 1, a low-pressure flash cooler 2, a flash separator 3, an ORC power generation system 4, a refrigeration cycle system 5, and a number of valves and pipelines. The ORC power generation system includes a superheater 401, a turbine generator 402, a condenser 403, a circulating working fluid pump 404, a preheater 405, and an evaporator 1 406. The refrigeration cycle system includes a regenerator 501, a condenser 502, a refrigerant heat exchanger 503, an evaporator 2 504, an absorber 505, a solution circulation pump 506, and a solution heat exchanger 507.

[0018] The output end of the black water flash steam pipeline from the evaporative hot water tower is connected to the low-pressure flash tank 1, and the low-pressure flash tank 1 is divided into two output branches. The first branch is connected to the input end pipeline of the flash separator 3 after passing through the 1# valve V1, the low-pressure flash cooler 2 and the 2# valve V2 in sequence; the second branch is connected to the input end pipeline of the flash separator 3 after passing through the 3# valve V3, the superheater 401, the evaporator 406, the preheater 405, the regenerator 501 and the 4# valve V4 in sequence.

[0019] The input end of the circulating medium pipeline from the superheater 401 is connected to the turbine generator 402, and the turbine generator 402 is connected to the superheater 401 through a pipeline in sequence through a condenser 403, a circulating medium pump 404, a preheater 405, and an evaporator.

[0020] The top circulating medium from the regenerator 501 is connected to the evaporator 2 504 through a pipeline, through the condenser 2 502, the refrigerant heat exchanger 503, and the 5# valve V5 in sequence; the output end of the evaporator 2 504 is connected to the refrigerant heat exchanger 503, the absorber 505, the solution circulation pump 506, the solution heat exchanger 507 and the regenerator 501 in sequence through a pipeline; the bottom output end of the regenerator 501 is connected to the absorber 505 through a pipeline, through the solution heat exchanger 507.

[0021] The working process of the utility model is as follows: the black water flash steam from the evaporative hot water tower is divided into two streams of materials after passing through the low-pressure flash tank, corresponding to two operating conditions respectively: Operating condition 1: close valve 3# and valve 4#, open valve 1# and valve 2#. The black water flash steam enters the low-pressure flash cooler through valve 1# and is cooled, and then enters the flash separator through valve 2#. Operating condition 2: close valve 1# and valve 2#, open valve 3# and valve 4#, the black water flash steam passes through the heater, evaporator, preheater and regenerator in turn through valve 3# and is cooled, and then enters the flash separator through valve 4#. After the circulating working fluid from the superheater enters the turbine generator as a byproduct of electric energy, it passes through the condenser, circulating working fluid pump, preheater and evaporator in turn and enters the superheater, and the above cycle process is repeated.

[0022] The top circulating working fluid from the regenerator passes through the condenser, the refrigerant heat exchanger, and the 5# valve in sequence before entering the evaporator for evaporation to obtain cooling capacity; the evaporated gas phase working fluid passes through the refrigerant heat exchanger, the absorber, the solution circulation pump, and the solution heat exchanger in sequence before entering the regenerator; the regenerator output flow enters the absorber through the solution heat exchanger to absorb the circulating working fluid after refrigeration.

[0023] The specific implementation process is as follows: 25000kg / h black water flash steam (temperature 130℃, pressure 0.27MPag) from the evaporative hot water tower is divided into two streams of materials after passing through the low-pressure flash tank, corresponding to two operating conditions:

[0024] Working condition 1: Close valves 3# and 4#, and open valves 1# and 2#. Black water flash steam enters the low-pressure flash cooler through valve 1# to 50℃, and then enters the flash separator through valve 2#.

[0025] Working condition 2: Close valves 1# and 2#, open valves 3# and 4#, and the black water flash steam is cooled to 120°C through valve 3# and superheater, and then continues to be cooled to 105°C through the evaporator. It is further cooled to 95°C by the preheater and then enters the regenerator. The temperature is reduced to 50°C, and then enters the flash separator through valve 4#.

[0026] The circulating working fluid flow rate from the superheater is 18500kg / h (temperature is 120℃, pressure is 1.0MPag) and enters the turbine generator to produce 145kW of electricity as a by-product. After the pressure is reduced to 0.15MPag, it is cooled to 40℃ through the condenser and pressurized to 1.0MPag by the circulating working fluid pump. After the temperature is raised to 95℃ through the preheater and evaporator, it enters the superheater and continues to repeat the above cycle process.

[0027] The circulating working fluid with a flow rate of 60kg / h (temperature is 48℃, pressure is 0.8MPag) from the top of the regenerator passes through the condenser and the refrigerant heat exchanger in sequence, and then the temperature is reduced to 18℃, and then it is reduced to 0.07MPag through the 5# valve and enters the evaporator for evaporation to obtain 2.8kW of cooling capacity (temperature -10℃); the evaporated gas phase working fluid passes through the refrigerant heat exchanger in sequence and then enters the absorber to be absorbed by the solution from the bottom of the regenerator. The obtained working fluid-rich solution enters the regenerator through the solution circulation pump and the solution heat exchanger.

[0028] The utility model designs a black water flash steam waste heat co-generation power and cooling device which can effectively recover the low-temperature waste heat in the black water flash steam for simultaneous by-production of power and low-temperature cooling, thereby reducing the circulating water consumption of the production device and improving the operating efficiency of the device.

[0029] The above embodiments and descriptions are only for explaining the principles of the invention of the utility model, and do not limit the protection scope of the utility model. Without departing from the spirit and scope of the invention of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The parts not involved in the utility model are the same as the prior art or can be implemented by the prior art.

Claims

1. A device for co-producing electricity and cooling using waste heat from black water flash steam, characterized in that: The device comprises a low-pressure flash tank (1), a low-pressure flash cooler (2), and a flash separator (3); The output end of the black water flash steam pipeline from the evaporative hot water tower is connected to a low-pressure flash tank (1), and the low-pressure flash tank (1) is divided into two output branches, the first branch is connected to the flash separator (3) through a low-pressure flash cooler (2); and the second branch is connected to the flash separator (3) through an ORC power generation system and a refrigeration cycle system in sequence.

2. The black water flash steam waste heat cogeneration power and cooling device according to claim 1, characterized in that: The ORC power generation system comprises a superheater (401), a turbine generator (402), a condenser 1 (403), a circulating medium pump (404), a preheater (405) and an evaporator 1 (406); The refrigeration cycle system comprises a regenerator (501), a second condenser (502), a refrigerant heat exchanger (503), a second evaporator (504), an absorber (505), a solution circulation pump (506) and a solution heat exchanger (507).

3. The black water flash steam waste heat cogeneration power and cooling device according to claim 2, characterized in that: The input end of the circulating working fluid pipeline from the superheater (401) is connected to the turbine generator (402), and the turbine generator (402) is connected to the superheater (401) through a pipeline in sequence through a condenser 1 (403), a circulating working fluid pump (404), a preheater (405), and an evaporator 1 (406); The top circulating working fluid of the self-regenerator (501) is connected to the evaporator 2 (504) through a pipeline, passing through the condenser 2 (502), the refrigerant heat exchanger (503), and the 5# valve (V5) in sequence; the output end of the evaporator 2 (504) is connected to the refrigerant heat exchanger (503), the absorber (505), the solution circulation pump (506), the solution heat exchanger (507) and the regenerator (501) in sequence through a pipeline; the bottom output end of the regenerator (501) is connected to the absorber (505) through a pipeline, passing through the solution heat exchanger (507).

4. The black water flash steam waste heat cogeneration power and cooling device according to claim 1, characterized in that: The second branch is connected to the input end pipeline of the flash separator (3) through the superheater (401), the evaporator 1 (406), the preheater (405), the regenerator (501) in sequence.

5. The black water flash steam waste heat cogeneration power and cooling device according to claim 4, characterized in that: The output end of the black water flash steam pipeline from the evaporative hot water tower is connected to the low-pressure flash tank (1), and the low-pressure flash tank (1) is divided into two output branches. The first branch is connected to the input end pipeline of the flash separator (3) after passing through the 1# valve (V1), the low-pressure flash cooler (2) and the 2# valve (V2) in sequence; the second branch is connected to the input end pipeline of the flash separator (3) after passing through the 3# valve (V3), the superheater (401), the evaporator 1 (406), the preheater (405), the regenerator (501) and the 4# valve (V4) in sequence.

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