Drainage flash evaporation type recovery device suitable for high, medium and low pressure steam pipelines

Abstract

The utility model discloses a drain flash recovery device suitable for high, medium and low pressure steam pipelines, which comprises a flash recovery tank, a high-pressure drain pipe, a low-pressure drain pipe and a medium-pressure drain pipe are respectively and fixedly connected around a tank body of the flash recovery tank, the high-pressure drain pipe is connected with a high-pressure drain pipe network, and the low-pressure drain pipe is connected with a low-pressure drain pipe network. A high-pressure drain valve group is arranged between the high-pressure drain pipe network and the high-pressure drain pipe, a low-pressure drain valve group is arranged between the low-pressure drain pipe network and the low-pressure drain pipe, and a medium-pressure drain valve group is arranged between the medium-pressure drain pipe network and the medium-pressure drain pipe; the drain water is flashed by utilizing the pressure change from the drain pipe to the flash recovery tank, so that the problem of recycling the drain water in pipe networks with different pressures of high, medium and low pressures is solved.

Description

Technical Field

[0001] The utility model relates to a steam pipeline drain recovery system, in particular to a drain flash evaporation recovery device for a steam pipeline of a coke dry quenching device. Background Art

[0002] In the coke dry quenching process of the coal coking industry, the inert gas used for quenching coke in the coke dry quenching device needs to be heat-exchanged and cooled, and then recycled to continue quenching coke. A large amount of steam is generated during the heat exchange process. The steam pipelines of this quenching device are generally divided into three types: high pressure (9.8 MPa), medium pressure (4.0 MPa), and low pressure (0.6 MPa). Drain valves are provided on each steam pipeline to discharge the condensed water generated in the pipeline. The steam condensed water is desalted water with a certain temperature, low hardness, and low alkalinity. Since the pressure difference of the condensate discharged from the steam pipelines of different pressure grades is relatively large, it is difficult to centrally recover the drains from the steam pipelines of different pressure grades. If the drains from the steam pipelines of each pressure grade are separately discharged into the nearby rainwater drainage system, there will also be a waste of system water resources, resulting in the need for the system to frequently replenish a large amount of water. At the same time, the heat energy carried by the drains in the steam pipelines of each pressure grade will also be directly discharged, resulting in energy waste. Summary of the Invention

[0003] The utility model provides a drain flash evaporation recovery device applicable to high, medium, and low pressure steam pipelines, which uses the flash evaporation principle to convert the drains in pipelines of different pressures into low pressure steam and low pressure drains, and solves the problems that the drains in pipelines of different pressures cannot be centrally recovered, and the direct discharge of drains causes waste of water resources and energy.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A drain flash evaporation recovery device applicable to high, medium, and low pressure steam pipelines includes: a flash evaporation recovery tank. Around the tank body of the flash evaporation recovery tank, a high pressure drain pipe, a low pressure drain pipe, and a medium pressure drain pipe are respectively fixedly connected. The high pressure drain pipe is connected to a high pressure drain pipe network, and a high pressure drain valve group is arranged between the high pressure drain pipe network and the high pressure drain pipe. A low pressure drain valve group is arranged between the low pressure drain pipe network and the low pressure drain pipe. A medium pressure drain valve group is arranged between the medium pressure drain pipe network and the medium pressure drain pipe. A low pressure steam output pipe is arranged at the top of the flash evaporation recovery tank, and the low pressure steam output pipe is connected to a low pressure steam pipe network. On the low pressure steam output pipe, a low pressure steam discharge air pressure valve is arranged, and a pressure control pipe of the low pressure steam discharge air pressure valve is connected to the flash evaporation recovery tank. A pressure transmitter is also arranged on the pressure control pipe of the low pressure steam discharge air pressure valve.

[0006] A low-pressure drain pipe is fixedly arranged at the bottom of the flash recovery tank. The middle of the low-pressure drain pipe is connected to the sewage drain pipe and the low-pressure drain pipe network through a tee. A sewage drain valve is arranged on the sewage drain pipe, and the sewage drain pipe communicates with the sewage pool; a low-pressure drain air pressure valve is also arranged between the low-pressure drain pipe and the low-pressure drain pipe network, and the drain pressure control pipe of the low-pressure drain air pressure valve communicates with the flash recovery tank.

[0007] Furthermore, an exhaust check valve is arranged on the low-pressure steam output pipe, and a drain check valve is arranged on the low-pressure drain pipe.

[0008] When the high, medium, and low drain pipe networks need to drain condensate, open the corresponding condensate valve, and drain the condensate in the pipe network into the flash recovery tank through the pipe network pressure. Since the pressure in the flash recovery tank is much lower than that in each pressure pipe network, flashing will occur, and most of the condensate will instantly flash into low-pressure steam. When the pressure in the flash recovery tank reaches a certain value, the pressure in the flash recovery tank is transmitted to the low-pressure steam discharge air pressure valve through the pressure transmitter and the pressure control pipe of the low-pressure steam discharge air pressure valve, and the valve opens. At this time, the low-pressure steam output pipe is connected to the low-pressure steam pipe network, and the low-pressure steam in the flash recovery tank is transported to the low-pressure steam pipe network for utilization; at the same time, some low-pressure condensate will also be generated in the flash recovery tank. When the pressure in the flash recovery tank reaches the set value, the pressure in the flash recovery tank is also transmitted to the low-pressure drain air pressure valve through the pressure control pipe of the low-pressure drain air pressure valve, and the valve opens. At this time, the low-pressure drain pipe is connected to the low-pressure drain pipe network, and the low-pressure condensate in the flash recovery tank is discharged into the low-pressure drain pipe network under the action of pressure for reuse; when some sewage or impurities accumulate in the flash recovery tank, the sewage drain valve can be opened to discharge the sewage in the flash recovery tank into the sewage pool for centralized treatment. Description of the Drawings

[0009] Figure 1 is the overall structural schematic diagram of the present utility model; Detailed Embodiments

[0010] The present invention will be described in detail below with reference to the drawings:

[0011] A hydrophobic flash recovery device applicable to high, medium and low pressure steam pipelines, comprising: a flash recovery tank 7, around which a high-pressure drain pipe 2, a low-pressure drain pipe 3 and a medium-pressure drain pipe 4 are fixedly connected respectively. The high-pressure drain pipe 2 is connected to a high-pressure drain pipe network 21, and a high-pressure drain valve group 18 is arranged between the high-pressure drain pipe network 21 and the high-pressure drain pipe 2. The low-pressure drain pipe 3 is connected to a low-pressure drain pipe network 22, and a low-pressure drain valve group 19 is arranged between the low-pressure drain pipe network 22 and the low-pressure drain pipe 3. The medium-pressure drain pipe 4 is connected to a medium-pressure drain pipe network 23, and a medium-pressure drain valve group 20 is arranged between the medium-pressure drain pipe network 23 and the medium-pressure drain pipe 4; A low-pressure steam output pipe 12 is provided at the top of the flash recovery tank 7, and the low-pressure steam output pipe 12 is connected to a low-pressure steam pipe network 1; On the low-pressure steam output pipe 12, a low-pressure steam discharge pressure valve 10 is provided, and a pressure control pipe 13 of the low-pressure steam discharge pressure valve is connected to the flash recovery tank 7, and a pressure transmitter 9 is also provided on the pressure control pipe 13 of the low-pressure steam discharge pressure valve.

[0012] A low-pressure drain discharge pipe 14 is fixedly arranged at the bottom of the flash recovery tank 7. The middle of the low-pressure drain discharge pipe 14 is connected to a blowdown pipe 6 and a low-pressure drain discharge pipe network 5 through a tee 15 at the same time. A blowdown valve 16 is arranged on the blowdown pipe 6, and the blowdown pipe 6 communicates with a sewage pool 8; A low-pressure drain discharge pressure valve 11 is also arranged between the low-pressure drain discharge pipe 14 and the low-pressure drain discharge pipe network 5, and a drain pressure control pipe 17 of the low-pressure drain discharge pressure valve communicates with the flash recovery tank 7.

[0013] Furthermore, an exhaust check valve 24 is also arranged on the low-pressure steam output pipe 12, and a drain check valve 25 is also arranged on the low-pressure drain discharge pipe 14.

Claims

1. A hydrophobic flash recovery device applicable to high, medium and low pressure steam pipelines, characterized in that: It includes a flash recovery tank (7). Around the tank body of the flash recovery tank (7), a high-pressure drain pipe (2), a low-pressure drain pipe (3), and a medium-pressure drain pipe (4) are fixedly connected respectively. The high-pressure drain pipe (2) is connected to a high-pressure drain pipe network (21). A high-pressure drain valve group (18) is arranged between the high-pressure drain pipe network (21) and the high-pressure drain pipe (2). The low-pressure drain pipe (3) is connected to a low-pressure drain pipe network (22). A low-pressure drain valve group (19) is arranged between the low-pressure drain pipe network (22) and the low-pressure drain pipe (3). The medium-pressure drain pipe (4) is connected to a medium-pressure drain pipe network (23). A medium-pressure drain valve group (20) is arranged between the medium-pressure drain pipe network (23) and the medium-pressure drain pipe (4). At the top of the flash recovery tank (7), a low-pressure steam output pipe (12) is provided. The low-pressure steam output pipe (12) is connected to a low-pressure steam pipe network (1). On the low-pressure steam output pipe (12), a low-pressure steam discharge pressure valve (10) is arranged. A pressure control pipe (13) of the low-pressure steam discharge pressure valve is connected to the flash recovery tank (7). A pressure transmitter (9) is also arranged on the pressure control pipe (13) of the low-pressure steam discharge pressure valve. At the bottom of the flash recovery tank (7), a low-pressure drain discharge pipe (14) is fixedly provided. The middle of the low-pressure drain discharge pipe (14) is connected to a blowdown pipe (6) and a low-pressure drain drainage pipe network (5) simultaneously through a tee (15). A blowdown valve (16) is arranged on the blowdown pipe (6). The blowdown pipe (6) communicates with a sewage pool (8). A low-pressure drain discharge pressure valve (11) is also arranged between the low-pressure drain discharge pipe (14) and the low-pressure drain drainage pipe network (5). A drain pressure control pipe (17) of the low-pressure drain discharge pressure valve communicates with the flash recovery tank (7).

2. The hydrophobic flash steam recovery device applicable to high, medium and low pressure steam pipelines according to claim 1, wherein: An exhaust check valve (24) is also arranged on the low-pressure steam output pipe (12). A drain check valve (25) is also arranged on the low-pressure drain discharge pipe (14).

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