A condensed water recovery refrigeration cycle device

Abstract

The utility model belongs to chemical industry device steam condensate recovery system waste heat utilization and production operation technical field, concretely relates to a kind of condensate recovery refrigeration circulating device.The device includes condensate flash tank, condensate pump, condensate cooler, refrigeration circulating system and several pipelines, can effectively recycle the heat in low-temperature steam condensate for by-product electric energy, reduce the circulating water consumption of production device, improve device operation benefit.

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, and specifically relates to a condensate recovery refrigeration cycle device. Background Technology

[0002] In the steam condensate recovery system of a chemical plant, various low-temperature steam condensates from throughout the plant need to be collected and reused. These low-temperature condensates are approximately 120-140°C and are considered low-grade heat sources. In traditional processes, the condensate is typically cooled to around 40°C by circulating water in a condensate cooler before being 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 condensate recovery and refrigeration cycle device. This device can effectively recover and utilize the heat in low-temperature steam condensate for by-product 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 condensate recovery and refrigeration cycle device includes a condensate flash tank, a first condensate cooler, and a second condensate cooler; the condensate flash tank is connected to the first condensate cooler via a condensate transfer pump.

[0007] The cold-side output end of the first condensate cooler is connected to the first condensate cooler through a high-pressure regenerator, and the circulating working fluid output end of the high-pressure regenerator is connected to the first evaporator in sequence through a condenser, a first subcooler, and a first pressure reducing valve.

[0008] The output end of the first evaporator is connected in sequence to the first subcooler, the first low-pressure absorber, the first solution circulation pump, the second low-pressure absorber, the second solution circulation pump, the second solution heat exchanger, and the low-pressure regenerator via pipes; the bottom output end of the low-pressure regenerator is connected to the solution heat exchanger and the low-pressure absorber via pipes.

[0009] The hot-side output terminal of the first condensate cooler is connected to the second condensate cooler, the cold-side output terminal of the second condensate cooler is connected to the second condensate cooler through a low-pressure regenerator, and the low-temperature condensate output terminal of the second condensate cooler is connected to the outside.

[0010] In the above technical solution: the condenser has another output end connected to the second evaporator through the second subcooler, and the output end at the top of the second evaporator is connected to the second low-pressure absorber through the second subcooler.

[0011] In the above technical solution: the top output end of the low-pressure regenerator is connected in sequence through the high-pressure absorber, the solution circulation pump, the first solution heat exchanger and the high-pressure regenerator, and the bottom output end of the high-pressure regenerator is connected to the high-pressure absorber through the first solution heat exchanger.

[0012] The beneficial effects of this utility model are as follows: The device includes a condensate flash tank, a condensate transfer pump, a condensate cooler, a refrigeration cycle system, and several pipelines. It can effectively recover and utilize the heat in the low-temperature steam condensate for by-product cooling, reduce the consumption of circulating water in the production unit, and improve the operating efficiency of the unit. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating the present invention.

[0014] In the diagram: 1 is the condensate flash tank, 2 is the condensate transfer pump, 3-1 is the first condensate cooler, 3-2 is the second condensate cooler, 4 is the refrigeration cycle system, 401 is the high-pressure regenerator, 402 is the condenser, 403-1 is the first subcooler, 404-1 is the first evaporator, 403-2 is the second subcooler, 404-2 is the second evaporator, 405 is the high-pressure absorber, 406 is the solution circulation pump, 407 is the first solution heat exchanger, and V1 is the first pressure reducing valve; 5 is the refrigeration cycle system, 501 is the low-pressure regenerator, 505-1 is the first low-pressure absorber, 505-2 is the second low-pressure absorber, 506-1 is the first solution circulation pump, 506-2 is the second solution circulation pump, 507 is the second solution heat exchanger, and V2 is the second pressure reducing valve. Detailed Implementation

[0015] 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:

[0016] like Figure 1 As shown, a condensate recovery refrigeration cycle device includes a condensate flash tank 1, a first condensate cooler 3-1, and a second condensate cooler 3-2; the condensate flash tank 1 is connected to the first condensate cooler 3-1 via a condensate transfer pump 2.

[0017] The cold side output end of the first condensate cooler 3-1 is connected to the first condensate cooler 3-1 through the high pressure regenerator 401, and the circulating working fluid output end of the high pressure regenerator 401 is connected to the first evaporator 404-1 in sequence through the condenser 402, the first subcooler 403-1, and the first pressure reducing valve V1.

[0018] The output end of the first evaporator 404-1 is connected in sequence through pipes to the first subcooler 403-1, the first low-pressure absorber 505-1, the first solution circulation pump 506-1, the second low-pressure absorber 505-2, the second solution circulation pump 506-2, the second solution heat exchanger 507, and the low-pressure regenerator 501; the bottom output end of the low-pressure regenerator 501 is connected through pipes to the solution heat exchanger 507 and the low-pressure absorber 505-1.

[0019] The hot side output terminal of the first condensate cooler 3-1 is connected to the second condensate cooler 3-2. The cold side output terminal of the second condensate cooler 3-2 is connected to the second condensate cooler 3-2 through the low-pressure regenerator 501. The low-temperature condensate output terminal of the second condensate cooler 3-2 is connected to the outside.

[0020] The condenser 402 also has an output end that is connected to the second evaporator 404-2 via the second subcooler 403-2, and the output end at the top of the second evaporator 404-2 is connected to the second low-pressure absorber 505-2 via the second subcooler 403-2.

[0021] The top output of the low-pressure regenerator 501 is connected in sequence to the high-pressure absorber 405, the solution circulation pump 406, the first solution heat exchanger 407 and the high-pressure regenerator 401. The bottom output of the high-pressure regenerator 401 is connected to the high-pressure absorber 405 through the first solution heat exchanger 407.

[0022] The working process of this utility model is as follows: Steam condensate from outside the boundary enters the condensate flash tank for collection. After being pressurized by the condensate transfer pump, it enters a two-stage condensate cooler for cooling. The resulting low-temperature condensate is sent outside the boundary for reuse. The circulating working fluid from the top of the high-pressure regenerator passes through a condenser and is divided into two streams entering the subcooler. The subcooling is then reduced in pressure before entering the evaporator for evaporation to obtain cooling capacity. The evaporated gaseous working fluid sequentially passes through the subcooler and low-pressure absorber, completing the first and second stages of low-pressure absorption. The circulating working fluid then enters the second-stage low-pressure absorber via a first-stage solution circulation pump, and then enters the low-pressure regenerator via a second-stage solution circulation pump and a solution heat exchanger. The output stream from the low-pressure regenerator enters the first-stage low-pressure absorber via the second-stage solution heat exchanger, absorbing the circulating working fluid from the refrigerated system. Steam from the top of the low-pressure regenerator enters the high-pressure absorber for absorption and concentration, and then enters the high-pressure regenerator via a solution circulation pump and a solution heat exchanger for continued circulation. The output stream from the high-pressure regenerator enters the high-pressure absorber via a solution heat exchanger, absorbing the circulating working fluid from the refrigerated system.

[0023] The specific implementation process is as follows: 60t / h steam condensate from outside the boundary enters the condensate flash tank for collection, and after being boosted to 0.6MPa by the condensate transfer pump, it enters the two-stage condensate cooler and is cooled to 40℃. The resulting low-temperature condensate is sent outside the boundary for reuse.

[0024] The circulating working fluid from the top of the high-pressure regenerator, with a flow rate of 4200 kg / h, is split into two streams after passing through the condenser. One stream, with a flow rate of 2500 kg / h, is cooled to 20°C after heat exchange in the cooler, then depressurized to 0.1 MPa via the V1 pressure reducing valve before entering the evaporator to generate 24 kW of cooling capacity. The evaporated gaseous working fluid then passes through a subcooler and enters the first-stage low-pressure absorber, where it is absorbed by the solution from the bottom of the low-pressure regenerator. The resulting solution, rich in working fluid, is then pumped into the second-stage low-pressure absorber via a solution circulation pump. The other stream, with a flow rate of 1700 kg / h, is cooled to 20°C after heat exchange in the cooler, then depressurized to 0.1 MPa via the V2 pressure reducing valve before entering the evaporator to generate 16 kW of cooling capacity. The evaporated gaseous working fluid then passes through a subcooler and enters the second-stage low-pressure absorber, where it is absorbed by the solution from the first-stage low-pressure absorber. The resulting solution, rich in working fluid, is then pumped into the low-pressure regenerator via a solution circulation pump and a solution heat exchanger. Steam from the top of the low-pressure regenerator enters the high-pressure absorber for absorption and concentration, and then passes through the solution circulation pump and solution heat exchanger before entering the high-pressure regenerator for continued circulation.

[0025] The condensate recovery and refrigeration cycle device designed in this utility model can effectively recover and utilize the heat in the low-temperature steam condensate for by-product cooling, thereby reducing the consumption of circulating water in the production unit and improving the operating efficiency of the unit.

[0026] 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 condensate recovery refrigeration cycle device, characterized in that: The device includes a condensate flash tank (1), a first condensate cooler (3-1), and a second condensate cooler (3-2); the condensate flash tank (1) is connected to the first condensate cooler (3-1) via a condensate transfer pump (2); The cold side output end of the first condensate cooler (3-1) is connected to the first condensate cooler (3-1) through the high pressure regenerator (401), and the circulating working fluid output end of the high pressure regenerator (401) is connected to the first evaporator (404-1) in sequence through the condenser (402), the first subcooler (403-1), and the first pressure reducing valve (V1). The output end of the first evaporator (404-1) is connected in sequence through pipes to the first subcooler (403-1), the first low-pressure absorber (505-1), the first solution circulation pump (506-1), the second low-pressure absorber (505-2), the second solution circulation pump (506-2), the second solution heat exchanger (507), and the low-pressure regenerator (501); the bottom output end of the low-pressure regenerator (501) is connected through pipes to the solution heat exchanger (507) and the low-pressure absorber (505-1); The hot side output end of the first condensate cooler (3-1) is connected to the second condensate cooler (3-2). The cold side output end of the second condensate cooler (3-2) is connected to the second condensate cooler (3-2) through a low-pressure regenerator (501). The low-temperature condensate output end of the second condensate cooler (3-2) is connected to the outside.

2. The condensate recovery refrigeration cycle device according to claim 1, characterized in that: The condenser (402) also has an output end that is connected to the second evaporator (404-2) via the second subcooler (403-2), and the output end at the top of the second evaporator (404-2) is connected to the second low-pressure absorber (505-2) via the second subcooler (403-2).

3. The condensate recovery refrigeration cycle device according to claim 1, characterized in that: The top output of the low-pressure regenerator (501) is connected in sequence to the high-pressure absorber (405), the solution circulation pump (406), the first solution heat exchanger (407) and the high-pressure regenerator (401), and the bottom output of the high-pressure regenerator (401) is connected to the high-pressure absorber (405) through the first solution heat exchanger (407).

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