Automatic nitrogen protection device for cracking furnace

Abstract

The utility model provides a pyrolysis furnace nitrogen automatic protection device, including the pyrolysis furnace, the pyrolysis furnace inside is equipped with pyrolysis furnace furnace tube, the pyrolysis furnace furnace tube top intercommunication with material inlet pipeline, bottom intercommunication with outlet pipeline, the pyrolysis furnace top is equipped with venting pipeline, and the side is equipped with the first nitrogen pipeline and second nitrogen pipeline in parallel, and the first nitrogen pipeline is equipped with the first regulating valve, and the second nitrogen pipeline is equipped with the second regulating valve, the material inlet pipeline is equipped with the first cut -out valve, and the venting pipeline is equipped with the second cut -out valve, and the outlet pipeline is equipped with the third cut -out valve, the utility model discloses utilize the pressure gauge detection pyrolysis furnace shell pressure, when pressure exceeds the limited value, then determine pyrolysis furnace furnace tube leak, system automatic switching valve, will the material gas in the furnace shell and sweeps out, to guarantee the device safety, easy operation, and the practicality is strong.

Description

Technical Field

[0001] This utility model belongs to the field of vinylidene fluoride synthesis technology and relates to an automatic nitrogen protection device for a pyrolysis furnace. Background Technology

[0002] Vinylidene fluoride (VDF) production uses dichlorofluoroethane as raw material. After vaporization and preheating, the VDF enters a cracking system for pyrolysis, yielding crude VDF gas. This gas is then cooled, dusted, and subjected to water and alkali washing to remove acidic gases such as hydrogen chloride and hydrogen fluoride. Finally, qualified VDF is obtained through distillation. During the cracking process, dichlorofluoroethane decomposes into VDF, hydrogen fluoride, and hydrogen chloride gases. Because the cracking furnace tubes are made of nickel-based alloys, after prolonged operation, hydrogen fluoride and hydrogen chloride can corrode the tubes, leading to tube damage and leakage of the material gas from the furnace tubes into the shell, posing a safety hazard. Utility Model Content

[0003] The purpose of this utility model is to provide an automatic nitrogen protection device for pyrolysis furnaces, which addresses the problems existing in the prior art and solves the safety hazard caused by a large amount of material gas accumulating inside the pyrolysis furnace shell after the furnace tubes are corroded and damaged.

[0004] Therefore, the present invention adopts the following technical solution: An automatic nitrogen protection device for a pyrolysis furnace includes a pyrolysis furnace, wherein a pyrolysis furnace tube is provided inside the pyrolysis furnace, the top of the pyrolysis furnace tube is connected to a material inlet pipe and the bottom is connected to an outlet pipe; The pyrolysis furnace is provided with a vent pipe at the top and a first nitrogen pipe and a second nitrogen pipe arranged in parallel on the side; the first nitrogen pipe is provided with a first regulating valve and the second nitrogen pipe is provided with a second regulating valve. The material inlet pipe is equipped with a first shut-off valve, the vent pipe is equipped with a second shut-off valve, and the outlet pipe is equipped with a third shut-off valve. The pyrolysis furnace is equipped with pressure gauges, which are interlocked with the first regulating valve, the second regulating valve, the first shut-off valve, the second shut-off valve, and the third shut-off valve.

[0005] The furnace tubes of the pyrolysis furnace are in a vertical spiral shape.

[0006] The beneficial effects of this utility model are as follows: This invention utilizes a pressure gauge to detect the pressure inside the pyrolysis furnace shell. When the pressure exceeds the limit, it is determined that the furnace tube is leaking. The system automatically switches valves to purge the material gas inside the pyrolysis furnace shell to ensure the safety of the device. This invention is convenient to use and easy to maintain. Attached Figure Description

[0007] Figure 1This is a schematic diagram of the device structure of this utility model.

[0008] In the diagram, 1-first shut-off valve, 2-material inlet gas pipe, 3-second shut-off valve, 4-venting pipe, 5-cracking furnace, 6-cracking furnace tube, 7-pressure gauge, 8-outlet gas pipe, 9-third shut-off valve, 10-first regulating valve, 11-first nitrogen pipe, 12-second regulating valve, 13-second nitrogen pipe. Detailed Implementation

[0009] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods.

[0010] like Figure 1 As shown, an automatic nitrogen protection device for a pyrolysis furnace includes a pyrolysis furnace 5, and a pyrolysis furnace tube 6 is provided inside the pyrolysis furnace 5. Specifically, the pyrolysis furnace tube 6 is in a vertical spiral shape; the top of the pyrolysis furnace tube 6 is connected to the material inlet pipe 2, and the bottom is connected to the outlet pipe 8.

[0011] The pyrolysis furnace 5 is equipped with a vent pipe 4 at the top and a first nitrogen pipe 11 and a second nitrogen pipe 13 arranged in parallel on the side; the first nitrogen pipe 11 is equipped with a first regulating valve 10 and the second nitrogen pipe 13 is equipped with a second regulating valve 12.

[0012] The material inlet pipe 2 is equipped with a first shut-off valve 1, the vent pipe 4 is equipped with a second shut-off valve 3, and the outlet pipe 8 is equipped with a third shut-off valve 9.

[0013] The pyrolysis furnace 5 is equipped with a pressure gauge 7, which is interlocked with the first regulating valve 10, the second regulating valve 12, the first shut-off valve 1, the second shut-off valve 3 and the third shut-off valve 9 respectively.

[0014] During use, when the furnace tube 6 of the pyrolysis furnace corrodes and leaks, the material inside the furnace tube 6 enters the shell of the pyrolysis furnace 5, causing the pressure in the shell of the pyrolysis furnace 5 to rise. The pressure gauge 7 shows that it reaches 20 kPa. The control system automatically closes the first shut-off valve 1, the third shut-off valve 9, and the second regulating valve 12, cutting off the material gas inlet and outlet as well as the nitrogen replenishment pipeline. It then opens the second shut-off valve 3 and the first regulating valve 10, using the nitrogen in the first nitrogen pipeline 11 to purge the material gas inside the shell of the pyrolysis furnace 5 through the venting pipeline 4. When the pressure gauge 7 shows that it is below 10 kPa, the second regulating valve 12 automatically opens, and the nitrogen in the second nitrogen pipeline 13 enters the shell of the pyrolysis furnace 5 to replenish the pressure.

Claims

1. An automatic nitrogen protection device for a pyrolysis furnace, characterized in that, The pyrolysis furnace (5) is provided with a pyrolysis furnace tube (6) inside. The top of the pyrolysis furnace tube (6) is connected to the material inlet pipe (2) and the bottom is connected to the outlet pipe (8). The pyrolysis furnace (5) is provided with a vent pipe (4) at the top and a first nitrogen pipe (11) and a second nitrogen pipe (13) arranged in parallel on the side; the first nitrogen pipe (11) is provided with a first regulating valve (10) and the second nitrogen pipe (13) is provided with a second regulating valve (12). The material inlet pipe (2) is equipped with a first shut-off valve (1), the vent pipe (4) is equipped with a second shut-off valve (3), and the outlet pipe (8) is equipped with a third shut-off valve (9). The pyrolysis furnace (5) is equipped with a pressure gauge (7), which is interlocked with the first regulating valve (10), the second regulating valve (12), the first shut-off valve (1), the second shut-off valve (3) and the third shut-off valve (9).

2. The automatic nitrogen protection device for a pyrolysis furnace according to claim 1, characterized in that, The pyrolysis furnace tube (6) is in a vertical spiral shape.

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