Automatic diffusing device of gas diffusing tower

Abstract

The utility model discloses an automatic diffusing device of a gas diffusing tower, and belongs to the field of blast furnace gas production. According to the automatic diffusing device of the gas diffusing tower, a water-sealed tank, a butterfly valve and a gate valve are arranged on a pipeline from a gas main pipe network to a diffusing tower branch pipe, a bypass gas pipeline is further arranged, the bypass gas pipeline is arranged between a valve group of the diffusing tower and the gas diffusing tower, and the valve group comprises the butterfly valve and the gate valve. The bypass gas pipeline and the water-sealed tank are arranged in parallel, and a V-shaped water seal and a pneumatic control valve are arranged on the bypass gas pipeline. The device solves the problems that water injection and drainage of a water-sealed tank are frequent, the water injection time is long, and three DN1200mm pneumatic butterfly valves of a diffusion tower are seriously abraded.

Description

Technical Field

[0001] The utility model relates to an automatic gas discharging device for a gas discharging tower, belonging to the field of blast furnace gas production. Background Technique

[0002] Two gas discharging towers with a capacity of 300,000 m 3 / h are set in the blast furnace gas pipeline network (one gas discharging tower includes three risers). The No. 1 gas discharging tower is used as an emergency gas discharging tower and does not participate in online regulation. The No. 2 gas discharging tower online regulates the unbalanced surplus gas. If the gas pipeline network pressure is often close to the set pressure and the operating pressure, the gas discharging tower device discharges frequently to ensure the safe operation of the gas pipeline network.

[0003] The blast furnace gas discharging device includes an electric butterfly valve, an electric blind plate valve, a pneumatic regulating valve, a discharging pipeline, an igniter, etc. In the operating state, the electric butterfly valve and the electric blind plate valve are always open. The pneumatic regulating valve is interlocked with the pipeline network pressure to control the gas discharge according to the pressure. After the pneumatic regulating valve is used for a period of time, there is a problem that the sealing surface is not tightly sealed. When the pipeline network pressure is lower than the set discharging pressure and the regulating valve is closed, gas leaks inside, wasting the available secondary energy.

[0004] In order to prevent internal leakage in the gas discharging tower and achieve the purpose of zero discharge. According to the working principle of the gas water seal, a vertical water seal tank is set behind the electric blind plate valve of the gas pipeline. By adjusting the water seal height in the vertical water seal tank, the gas discharging requirements of different pressure grades are realized, thus avoiding gas leakage during normal operation. When the gas does not discharge, the water level reaches a certain height to cut off the gas water seal. If the pipeline network pressure is higher than the set water level pressure, the quick discharge valve and the quick discharge dewatering device supporting the gas water seal tank will open to release the water seal, and the gas enters the gas discharging tower for ignition discharge to ensure the normal operation of the gas pipeline network.

[0005] During the operation of the gas discharging tower, due to the large fluctuation of the gas pipeline network pressure, the water seal tank is frequently filled with water and drained, the water injection time is relatively long, and the three DN1200mm pneumatic butterfly valves of the gas discharging tower are severely worn. Content of the Utility Model

[0006] In order to overcome the above deficiencies, the utility model provides an automatic gas discharging device for a gas discharging tower, which solves the problems of frequent water injection and drainage of the water seal tank, relatively long water injection time, and severe wear of the three DN1200mm pneumatic butterfly valves of the gas discharging tower by setting a small water seal tank and a "V" type water seal.

[0007] This utility model provides an automatic venting device for a gas venting tower. A butterfly valve and a slide gate valve are installed on the pipeline from the main gas pipeline to the branch pipeline of the venting tower. It also includes a water seal tank and a bypass gas pipeline. The bypass gas pipeline is set between the DN2000mm valve group of the venting tower and the gas venting tower. The valve group refers to the butterfly valve and the slide gate valve. The bypass gas pipeline and the water seal tank are set in parallel. A "V" type water seal and a pneumatic regulating valve are installed on the bypass gas pipeline.

[0008] Furthermore, the diameter of the bypass gas pipeline is 1000mm; the diameter of the "V"-shaped water seal is 1000mm.

[0009] Furthermore, one end of the bypass gas pipeline is connected to the DN2000mm main pipeline after the slide gate valve, and the other end is directly connected to the No. 3 riser of the venting tower.

[0010] Furthermore, a water injection pipe is connected to the front end of the "V"-shaped water seal, and an overflow pipe is connected to the rear end. A gas drainer is connected below the overflow pipe. A gas drainer is connected below the "V"-shaped water seal, and a DN200mm gate valve and a quick-release butterfly valve are installed between the overflow pipe and the gas drainer.

[0011] The technical solution provided by this utility model adds a bypass gas pipeline, on which a "V"-shaped water seal (as a small water seal tank) is installed to replace the large water seal tank on the parallel pipeline. This reduces the frequency of filling and draining the large water seal tank and ensures timely discharge when the gas pressure fluctuates greatly, while also significantly reducing the water consumption of the gas water seal. The "V"-shaped water seal has a diameter of 1000mm. Replacing the large water seal tank on the parallel pipeline with a DN1000mm V-shaped water seal replaces the original drainage function of the large water seal tank. When the gas pressure exceeds the set value, the DN1000mm V-shaped water seal is released first, igniting and releasing a certain amount of gas to restore the gas pressure to the normal range, thus avoiding the release of the large water seal.

[0012] The automatic gas venting device for a gas venting tower provided by this utility model has the following beneficial effects:

[0013] (1) This device saves water consumption for the water seal;

[0014] (2) This device shortens the water seal injection and drainage time and improves the safety factor of the gas pipeline network;

[0015] (3) This device solved the problem of severe wear of the three DN1200mm pneumatic butterfly valves in the venting tower and extended the service life of the pneumatic butterfly valves.

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the automatic venting device for the gas venting tower of this utility model;

[0018] Figure 2 This diagram shows the connection relationship between the "V"-shaped water seal and other components.

[0019] In the diagram: 1 is the main gas pipeline, 2 is the venting tower branch pipe, 3 is the butterfly valve, 4 is the slide valve, 5 is the water seal tank, 6 is the bypass gas pipeline, 7 is the "V" type water seal, 8 is the pneumatic regulating valve, 9 is the riser, 10 is the water injection pipeline, 11 is the overflow pipeline, and 12 is the gas drainer. Detailed Implementation Example

[0020] like Figure 1 As shown, an automatic venting device for a gas venting tower includes a butterfly valve 3 and a slide gate valve 4 on the main gas pipeline 1 leading to the branch pipe 2 of the venting tower. It also includes a water seal tank 5 and a bypass gas pipeline 6. The bypass gas pipeline 6 is located between the DN2000mm valve group of the venting tower and the gas venting tower. The valve group refers to the butterfly valve 3 and the slide gate valve 4. The bypass gas pipeline 6 and the water seal tank 5 are connected in parallel. A "V"-shaped water seal 7 and a pneumatic regulating valve 8 are installed on the bypass gas pipeline 6.

[0021] Furthermore, the diameter of the bypass gas pipeline 6 is 1000mm; the diameter of the "V"-shaped water seal 7 is 1000mm.

[0022] Furthermore, one end of the bypass gas pipeline 6 is connected to the DN2000mm main pipeline 1 after the slide gate valve, and the other end is directly connected to the venting tower 3# riser 9.

[0023] Furthermore, a water injection pipe 10 is connected to the front end of the "V"-shaped water seal 7, and an overflow pipe 11 is connected to the rear end. A gas drain valve 12 is connected below the overflow pipe 11; that is, a gas drain valve is connected below the "V"-shaped water seal, and a DN200mm gate valve and a quick-release butterfly valve are installed between the overflow pipe and the gas drain valve.

[0024] The technical solution provided by this utility model adds a bypass gas pipeline, and installs a "V"-shaped water seal (as a small water seal tank) on the pipeline to replace the large water seal tank on the parallel pipeline. This reduces the frequency of filling and draining the large water seal tank and ensures timely discharge when the gas pressure fluctuates greatly. It also greatly reduces the water consumption of the gas water seal.

[0025] The specific setup is as follows: A DN1000mm bypass gas pipeline is designed between the DN2000mm valve group of the No. 2 venting tower and the gas venting tower. One end of this pipeline is connected to the DN2000mm main pipeline after the gate valve, and the other end is directly connected to the No. 3 riser of the venting tower. A DN1000mm pneumatic regulating valve is added at the front end, followed by a DN1000mm "V"-shaped water seal, with the end connected to the No. 3 riser of the venting tower. A water injection pipeline is connected to the front end of the "V"-shaped water seal, and an overflow pipeline is connected to the rear end. A gas drainer is connected below the overflow pipeline. That is, a gas drainer is connected below the "V"-shaped water seal. A DN200mm gate valve and a quick-release pneumatic butterfly valve are installed between the overflow pipeline and the gas drainer. In this way, the water volume injected into the "V"-shaped water seal is 1 / 6 of the volume of the large water seal tank on the parallel pipeline. Compared with the original use of a separate large water seal tank, this not only saves water consumption but also shortens the injection and drainage time.

[0026] The device was tested and applied to the modification of the No. 2 venting tower of a company. After implementation, the results were significant. Under normal conditions, when the gas pressure is slightly high, the gas is ignited and vented through a single No. 3 riser via a DN1000mm pipeline. When the gas pipeline pressure is low, both the large water seal tank and the "V"-shaped water seal are filled with water to seal the gas. When the gas pipeline pressure fluctuates above the set pressure, the DN1000mm "V"-shaped water seal first interlocks and drains the water from the water seal through the quick-release valve, participating in pipeline pressure regulation to meet production requirements. In special circumstances, when the gas pressure remains high after adjustment by the DN1000mm pneumatic regulating valve, the water in the large water seal tank is drained through a gas pressure interlock, also participating in gas pressure regulation. In this way, the large water seal tank rarely participates in operation, saving a significant amount of water, protecting the three DN1200mm pneumatic butterfly valves on the venting tower riser, and making the gas pipeline safer.

Claims

1. An automatic venting device for a gas venting tower, comprising a water seal tank, a butterfly valve, and a gate valve on the pipeline connecting the main gas pipeline to the branch pipe of the venting tower, characterized in that: A bypass gas pipeline is provided, which is located between the valve group of the venting tower and the gas venting tower. The valve group refers to butterfly valves and slide gate valves. The bypass gas pipeline and the water seal tank are connected in parallel. A "V" type water seal and a pneumatic regulating valve are provided on the bypass gas pipeline.

2. The automatic venting device for a gas venting tower according to claim 1, characterized in that: The bypass gas pipeline has a diameter of 1000mm; the "V"-shaped water seal has a diameter of 1000mm.

3. The automatic venting device for a gas venting tower according to claim 1, characterized in that: One end of the bypass gas pipeline is connected to the DN2000mm main pipeline after the slide gate valve, and the other end is directly connected to the No. 3 riser of the venting tower.

4. The automatic venting device for a gas venting tower according to claim 1, characterized in that: A water injection pipe is connected to the front end of the "V"-shaped water seal, and an overflow pipe is connected to the rear end. A gas drainer is connected below the overflow pipe.

5. The automatic venting device for a gas venting tower according to claim 4, characterized in that: A DN200mm gate valve and a fast-release butterfly valve are installed between the overflow pipe and the gas drain.

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