A combined condensate recovery power generation and refrigeration unit

Abstract

This utility model belongs to the field of waste heat utilization and production operation technology of steam condensate recovery systems, specifically relating to a combined condensate recovery power generation and refrigeration unit. The unit includes a condensate flash tank, a condensate transfer pump, a condensate cooler, an ORC turbine power generation system, a refrigeration cycle system, and several pipelines. It can effectively recover and utilize the heat in low-temperature steam condensate for by-product electricity and low-temperature cooling, reducing circulating water consumption in the production unit and improving the unit's operating efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat utilization and production operation technology of steam condensate recovery system in chemical plant, specifically relating to a combined condensate recovery power generation and refrigeration device. Background Technology

[0002] In the steam condensate recovery system of a chemical plant, various low-temperature steam condensates from the entire plant need to be collected and reused through the condensate recovery system. The temperature of the low-temperature condensate is about 120-140℃, which is a low-grade heat source. In traditional processes, the condensate is usually cooled to about 40℃ by circulating water in a condensate cooler and then returned to the circulating water system for reuse.

[0003] The main shortcomings of the above process and equipment are that the use of circulating water to cool the steam condensate does not effectively recover the heat of the steam condensate, and it also requires a large amount of circulating water, resulting in a great waste of energy and increasing the production and operation costs of the equipment. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a combined condensate recovery power generation and refrigeration device. This device can effectively recover and utilize the heat in low-temperature steam condensate for by-product power generation and low-temperature cooling, thereby reducing the consumption of circulating water in the production unit and improving the operating efficiency of the unit.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A combined condensate recovery power generation and refrigeration unit includes a condensate flash tank, a condensate transfer pump, a condensate cooler, an ORC turbine power generation system, a refrigeration cycle system, and several pipelines. Steam condensate from outside the boundary is connected to the condensate flash tank, which is connected to the condensate cooler via the condensate transfer pump. The condensate cooler is connected to the ORC turbine power generation system and the refrigeration cycle system in sequence.

[0007] In this utility model, the ORC power generation system includes a superheater, a turbine generator, a condenser, a circulating working fluid pump, a preheater, and an evaporator.

[0008] In this utility model's technical solution: another output end of the condensate cooler is connected to the superheater, and the output end of the circulating working fluid pipeline from the superheater is connected to the turbine generator. The turbine generator is connected to the superheater via pipelines passing through the condenser, circulating working fluid pump, preheater, and evaporator in sequence.

[0009] In this utility model's technical solution, the superheater also has an output end that is sequentially connected to the evaporator, preheater, and regenerator of the refrigeration cycle system.

[0010] In this 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.

[0011] In this utility model's technical solution: one output end of the regenerator is connected to the condensate cooler, and the other output end is connected to the evaporator in sequence via the condenser, refrigerant heat exchanger, and pressure reducing valve; the output end of the evaporator is connected to the refrigerant heat exchanger, absorber, solution circulation pump, solution heat exchanger, and regenerator in sequence via pipes; the bottom output end of the regenerator is connected to the absorber via the solution heat exchanger through pipes.

[0012] The beneficial effects of this utility model are:

[0013] The device includes a condensate flash tank, a condensate transfer pump, a condensate cooler, an ORC turbine power generation system, a refrigeration cycle system, and several pipelines. It can effectively recover and utilize the heat in the low-temperature steam condensate for by-product power generation and low-temperature cooling, reduce the consumption of circulating water in the production unit, and improve the operating efficiency of the unit. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the present invention.

[0015] In the diagram: 1-Condensate flash tank, 2-Condensate transfer pump, 3-Condensate cooler, 4-ORC power generation system, 401-Superheater, 402-Turbine generator, 403-Condenser, 404-Circulating working fluid pump, 405-Preheater, 406-Evaporator, 5-ORC power generation system, 501-Regenerator, 502-Condenser, 503-Refrigerant heat exchanger, 504-Evaporator, 505-Absorber, 506-Solution circulation pump, 507-Solution heat exchanger, V1-Pressure reducing valve. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited thereto:

[0017] like Figure 1 As shown, a condensate recovery power generation and refrigeration combined unit includes a condensate flash tank 1, a condensate transfer pump 2, a condensate cooler 3, an ORC turbine power generation system 4, a refrigeration cycle system 5, and several pipelines.

[0018] 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 406.

[0019] The refrigeration cycle system includes a regenerator 501, a condenser 502, a refrigerant heat exchanger 503, an evaporator 504, an absorber 505, a solution circulation pump 506, and a solution heat exchanger 507.

[0020] The steam condensate pipeline output end from outside the boundary is connected to the condensate flash tank 1. The pipeline output end of the condensate flash tank 1 is connected to the inlet of the condensate transfer pump 2. The outlet pipeline of the condensate transfer pump 2 is connected to the shell-side input end of the condensate cooler 3. The low-temperature condensate pipeline at the shell-side output end of the condensate cooler is sent to the outside of the boundary.

[0021] The pipe from the output end of the regenerator 501 is connected to the pipe side of the condensate cooler 3. The pipe side output pipe of the condensate cooler 3 is connected to the superheater 401. The input end of the circulating working fluid pipe from the superheater 401 is connected to the turbine generator 402. The turbine generator 402 is connected to the superheater 401 via pipes passing through the condenser 403, the circulating working fluid pump 404, the preheater 405, and the evaporator 406 in sequence.

[0022] The top circulating working fluid from regenerator 501 is connected to evaporator 504 via pipes through condenser 502, refrigerant heat exchanger 503, pressure reducing valve V1, and so on. The output end of evaporator 504 is connected to refrigerant heat exchanger 503, absorber 505, solution circulation pump 506, solution heat exchanger 507, and regenerator 501 via pipes. The bottom output end of regenerator 501 is connected to absorber 505 via solution heat exchanger 507.

[0023] The working process of this utility model is as follows: steam condensate from outside the boundary enters the condensate flash tank for collection, and after being pressurized by the condensate transfer pump, it enters the condensate cooler for cooling. The resulting low-temperature condensate is sent outside the boundary for reuse.

[0024] High-pressure boiler water from the condensate recovery furnace enters the superheater, evaporator, preheater and regenerator in sequence, is cooled and then returns to the condensate recovery furnace; the circulating working fluid from the superheater enters the turbine generator to generate electricity, and then passes through the condenser, circulating working fluid pump, preheater and evaporator in sequence before returning to the superheater to continue repeating the above cycle.

[0025] The top circulating working fluid from the regenerator passes through the condenser, refrigerant heat exchanger, and pressure reducing generator in sequence before entering the evaporator to evaporate and obtain low-temperature cooling capacity. The evaporated gaseous working fluid passes through the refrigerant heat exchanger, absorber, solution circulation pump, and solution heat exchanger in sequence before entering the regenerator. The output stream from the regenerator enters the absorber through the solution heat exchanger to absorb the circulating working fluid after refrigeration, and the above cycle process is repeated.

[0026] The specific implementation process is as follows: 60t / h steam condensate (temperature 125℃, pressure 0.25MPa) from outside the boundary enters the condensate flash tank for collection. After being pressurized to 0.6MPa by the condensate transfer pump, it enters the condensate cooler and is cooled to 40℃. The resulting low-temperature condensate is sent outside the boundary for reuse. 2.0MPa demineralized water from the condensate cooler, with a flow rate of 2500kg / h and a temperature of 135℃, enters the superheater, evaporator, preheater, and regenerator in sequence and is then cooled to 65℃ before returning to the condensate cooler.

[0027] The circulating working fluid from the superheater has a flow rate of 4500 kg / h (temperature 120℃, pressure 1.0 MPa) and enters the turbine generator to generate 27 kW of electrical energy. After the pressure is reduced to 0.15 MPa, it is cooled to 40℃ by the condenser and then pressurized to 1.0 MPa by the circulating working fluid pump. After passing through the preheater and evaporator, the temperature is raised to 95℃ and it enters the superheater, where the above cycle process continues.

[0028] The circulating working fluid (temperature 48℃, pressure 1.2MPag) with a top flow rate of 780kg / h from the regenerator passes through the condenser and refrigerant heat exchanger in sequence. After its temperature drops to 18℃, it is then depressurized to 0.07MPag by the pressure reducing valve before entering the evaporator to obtain 13kW of cooling capacity (temperature -10℃). The evaporated gaseous working fluid passes through the refrigerant heat exchanger in sequence and then enters the absorber where it is absorbed by the solution from the bottom of the regenerator. The resulting solution, rich in working fluid, enters the regenerator through the solution circulation pump and the solution heat exchanger.

[0029] The present invention designs a combined condensate recovery power generation and refrigeration device. This device can effectively recover and utilize the heat in low-temperature steam condensate for by-product power generation and low-temperature cooling, thereby reducing the consumption of circulating water in the production unit and improving the operating efficiency of the unit.

[0030] The embodiments and descriptions above are merely illustrative of the principles of this invention and do not limit the scope of protection of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. Parts not covered in this invention are identical to or can be implemented using existing technology.

Claims

1. A combined water condensation recovery power generation and refrigeration device, characterized by: The device includes a condensate flash tank (1), a condensate transfer pump (2), a condensate cooler (3), an ORC turbine power generation system (4), a refrigeration cycle system (5), and several pipelines; condensate vapor from outside the boundary is connected to the condensate flash tank (1), and the condensate flash tank (1) is connected to the condensate cooler (3) through the condensate transfer pump (2); the condensate cooler (3) is connected to the condensate cooler (3) in sequence through the ORC turbine power generation system (4) and the refrigeration cycle system (5).

2. The cogeneration and refrigeration combined device of claim 1, wherein: The ORC power generation system includes a superheater (401), a turbine generator (402), a first condenser (403), a circulating working fluid pump (404), a preheater (405), and a first evaporator (406).

3. The cogeneration and refrigeration combined device of claim 2, wherein: Another output end of the condensate cooler (3) is connected to the superheater (401), and the output end of the circulating working fluid pipeline from the superheater (401) is connected to the turbine generator (402). The turbine generator (402) is connected to the superheater (401) via a pipeline through the first condenser (403), the circulating working fluid pump (404), the preheater (405), and the first evaporator (406).

4. The cogeneration and refrigeration combined device of claim 3, wherein: The superheater (401) also has an output end that is connected in sequence to the first evaporator (406), the preheater (405) and the regenerator (501) of the refrigeration cycle system.

5. The cogeneration and refrigeration combined device of claim 1, wherein: The refrigeration cycle system includes 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).

6. The cogeneration and refrigeration combined device of claim 5, wherein: One output end of the regenerator (501) is connected to the condensate cooler (3), and the other output end is connected to the second evaporator (504) in sequence through the second condenser (502), the refrigerant heat exchanger (503), and the pressure reducing valve (V1); the output end of the second evaporator (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 pipes; the bottom output end of the regenerator (501) is connected to the solution heat exchanger (507) and the absorber (505) through pipes.

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