Black water flash steam waste heat refrigeration cycle system
By designing the black water flash steam waste heat refrigeration circulation system, the problem that the low-temperature waste heat of the black water flash steam in the coal gasification device is not effectively recovered, and the acquisition of low-temperature cooling capacity and the reduction of circulating water consumption are achieved, and the operating efficiency of the device is improved.
Patent Information
- Application Number
- CN202420685125.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The prior art fails to effectively recover the low-temperature waste heat in the black water flash vapor in the coal gasification device, resulting in a large amount of circulating water consumption and energy waste, and increases production and operation costs.
A black water flash steam waste heat refrigeration circulation system is designed, and the low-temperature waste heat in the black water flash steam is effectively recovered for refrigeration through components such as low-pressure flash tanks, low-pressure flash coolers, flash separators and refrigeration circulation systems.
The acquisition of low-temperature cooling capacity is achieved, the circulating water consumption of the production equipment is reduced, and the operating efficiency of the equipment is improved.
Smart Images
Figure CN222438226U_ABST
Abstract
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 refrigeration cycle system. 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 the 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. Utility Model Content
[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 refrigeration cycle system, which can effectively recover the low-temperature waste heat in the black water flash steam for refrigeration, obtain low-temperature cooling capacity, reduce the circulating water consumption of the production device, and improve 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 refrigeration cycle system, the device comprises a low-pressure flash tank, a low-pressure flash cooler, a flash separator, a refrigeration cycle system and a number of valves and pipelines;
[0006] The output end of the black water flash steam pipeline from the evaporative hot water tower is connected to the low-pressure flash tank. The circulating gas heat exchanger is divided into two output branches. The first branch is connected to the flash separator through the low-pressure flash cooler in turn; the second branch is connected to the input end pipeline of the flash separator through the regenerator.
[0007] In the technical scheme of the utility model: the refrigeration cycle system includes a regenerator, a condenser, a refrigerant heat exchanger, an evaporator, an absorber, a solution circulation pump and a solution heat exchanger; the circulating working fluid at the top of the regenerator is connected to the evaporator through a pipeline in sequence through the condenser and the refrigerant heat exchanger; the output end of the evaporator is connected to the refrigerant heat exchanger, the absorber, the solution circulation pump, the solution heat exchanger and the regenerator through a pipeline in sequence; the output end of the regenerator is connected to the absorber through a pipeline through the solution heat exchanger.
[0008] In the technical solution of the utility model: 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.
[0009] In the technical solution of the utility model: the second branch is connected to the input end pipeline of the flash separator after passing through the 3# valve, the regenerator and the 4# valve in sequence.
[0010] In the technical solution of the utility model: the refrigerant heat exchanger is connected to the evaporator through the 5# valve.
[0011] The beneficial effects of the utility model are as follows: the device comprises a low-pressure flash tank, a low-pressure flash cooler, a flash separator, a refrigeration cycle system and a plurality of valves and pipelines, which can effectively recover the low-temperature waste heat in the black water flash vapor for refrigeration, obtain low-temperature cooling capacity, reduce the circulating water consumption of the production device, and improve the operation efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the process of the utility model.
[0013] In the figure: 1- low-pressure flash tank, 2- low-pressure flash cooler, 3- flash separator, 4- refrigeration cycle system, 401- regenerator, 402- condenser, 403- refrigerant heat exchanger, 404- evaporator, 405- absorber, 406- solution circulation pump, 407- solution heat exchanger, V1- 1# valve, V2- 2# valve, V3- 3# valve, V4- 4# valve, V5- 5# valve. DETAILED DESCRIPTION
[0014] The present invention is further described below in conjunction with the embodiments, but the protection scope of the present invention is not limited thereto:
[0015] like Figure 1 As shown, a black water flash steam waste heat refrigeration cycle system includes a low-pressure flash tank 1, a low-pressure flash cooler 2, a flash separator 3, a refrigeration cycle system 4, and a number of valves and pipelines. The refrigeration cycle system includes a regenerator 401, a condenser 402, a refrigerant heat exchanger 403, an evaporator 404, an absorber 405, a solution circulation pump 406, and a solution heat exchanger 407. 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 regenerator 407 and the 4# valve V4 in sequence.
[0016] The top circulating medium from the regenerator 401 passes through the condenser 402, the refrigerant heat exchanger 403, and the 5# valve V5 in sequence and is connected to the evaporator 404 through a pipeline; the output end of the evaporator 404 is connected to the refrigerant heat exchanger, the absorber 405, the solution circulation pump 406, the solution heat exchanger 407 and the regenerator 401 in sequence through a pipeline; the bottom output end of the regenerator 401 passes through the solution heat exchanger 407 and the absorber 405 through a pipeline.
[0017] 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, which correspond 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 flash separator 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 and preheater in sequence through valve 3# and is cooled, and then enters the flash separator through valve 4#.
[0018] 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.
[0019] The specific implementation process is as follows: 25000kg / h black water flash steam (temperature 130℃, pressure 0.27MPa) 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:
[0020] Working condition 1: Close valves 3# and 4#, and open valves 1# and 2#. The black water flash steam enters the low-pressure flash cooler through valve 1# and is cooled to 50℃, and then enters the flash separator through valve 2#.
[0021] Working condition 2: Close valves 1# and 2#, open valves 3# and 4#, and the black water flash steam passes through valve 3# and is cooled to 50°C in the regenerator, and then enters the flash separator through valve 4#.
[0022] The circulating working fluid with a flow rate of 65kg / h (temperature is 48°C, 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°C, and then the pressure is reduced to 0.07MPag through the 5# valve, and then enters the evaporator for evaporation to obtain 3.2kW of cooling capacity (temperature -10°C); the evaporated gas phase working fluid passes through the refrigerant heat exchanger in sequence and 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.
[0023] The black water flash steam waste heat refrigeration circulation system designed by the utility model can effectively recover the low-temperature waste heat in the black water flash steam for refrigeration, obtain low-temperature cooling capacity, reduce the circulating water consumption of the production device, and improve the operation efficiency of the device.
[0024] 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 black water flash steam waste heat refrigeration cycle system, characterized in that: The system comprises a low-pressure flash tank (1), a low-pressure flash cooler (2), a flash separator (3), a refrigeration cycle system (4), and a plurality of valves and pipelines; 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). The low-pressure flash tank (1) is divided into two output branches. The first branch is connected to the flash separator (3) through the low-pressure flash cooler (2) in sequence; the second branch is connected to the input end pipeline of the flash separator (3) through the regenerator (401).
2. The black water flash steam waste heat refrigeration cycle system according to claim 1, characterized in that: The refrigeration cycle system (4) comprises a regenerator (401), a condenser (402), a refrigerant heat exchanger (403), an evaporator (404), an absorber (405), a solution circulation pump (406) and a solution heat exchanger (407); the circulating working fluid at the top of the regenerator (401) is connected to the evaporator (404) through a pipeline in sequence through the condenser (402) and the refrigerant heat exchanger (403); the output end of the evaporator (404) is connected to the refrigerant heat exchanger (403), the absorber (405), the solution circulation pump (406), the solution heat exchanger (407) and the regenerator (401) in sequence through a pipeline; the bottom output end of the regenerator (401) is connected to the absorber (405) through a pipeline through the solution heat exchanger (407).
3. The black water flash steam waste heat refrigeration cycle system according to claim 1, characterized in that: 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.
4. The black water flash steam waste heat refrigeration cycle system according to claim 1, characterized in that: The second branch is connected to the input end pipeline of the flash separator (3) after passing through the 3# valve (V3), the regenerator (401) and the 4# valve (V4) in sequence.
5. The black water flash steam waste heat refrigeration cycle system according to claim 1, characterized in that: The refrigerant heat exchanger (403) is connected to the evaporator (404) via valve #5 (V5).