Alkali sealing device for displacement discharge pipe of calcium carbide method vinyl chloride converter

Abstract

The utility model discloses an alkali sealing device for a replacement discharge pipe of a calcium carbide method vinyl chloride converter, which comprises an alkali sealing tank, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, the blow-down pipe is arranged at the top of the alkali sealing tank; and the alkali discharge pipe is arranged on a liquid outlet at the bottom of the alkali sealing tank.

Description

TECHNICAL FIELD

[0001] The alkali sealing device for the replacement discharge pipe of the calcium carbide method vinyl chloride converter belongs to the technical field of vinyl chloride production equipment. BACKGROUND

[0002] In the production of the calcium carbide method polyvinyl chloride, in the synthesis process of vinyl chloride (VCM), hydrogen chloride and acetylene are used to generate vinyl chloride monomer through the chlorination of mercury catalyst, and this chemical reaction is to use mercury chloride as a catalyst for the synthesis of vinyl chloride.

[0003] In the production process, the acetylene and hydrogen chloride mixed gas enters the top of the converter, and the mercury chloride at the top of the converter first starts to act. In the continuous production process, the HgCl2 catalyst is reduced in activity or completely loses activity due to the presence of some impurities (such as CO, H2S, etc.) in the reactants and the sublimation of mercury chloride caused by high temperature, which leads to the downward movement of the conversion reactor reaction zone and affects the conversion efficiency. Therefore, the catalyst needs to be turned over after the converter runs for a period of time, and in addition, during the operation of a single converter, leakage occurs, which needs to be repaired after purging and replacing.

[0004] Since the main component of the catalyst is activated carbon, a large amount of hydrogen chloride is adsorbed on the surface of the catalyst during long-term operation. Before the catalyst is turned over or the converter is repaired, the hydrogen chloride adsorbed on the catalyst in the converter needs to be purged with nitrogen gas to avoid causing personal injury and environmental pollution.

[0005] In the original production process, the converter is provided with a vent pipe, and the hydrogen chloride adsorbed in the catalyst is directly purged and discharged into the air using nitrogen gas before operation, which can cause the following hazards.

[0006] 1. Strong irritation to the health of on-site operators, rapid stimulation of the eyes and respiratory system, leading to tearing, severe coughing, difficulty breathing, chest pain, bronchial spasm, pulmonary edema, skin and mucous membrane contact causing burning pain and redness, and severe necrosis.

[0007] 2. Hydrogen chloride reacts with atmospheric water vapor to form acid mist, acid rain, which destroys vegetation, corrodes buildings and water sources, affects land and water acidification, damages the biological chain, and destroys the ecological balance.

[0008] Strong corrosion to metal equipment, pipelines and structures in the factory area, increasing the maintenance cost of equipment and facilities and reducing the service life of equipment and facilities. INVENTION CONTENTS

[0009] In view of the above technical problems, the alkali sealing device for the replacement discharge pipe of the calcium carbide method vinyl chloride converter is provided.

[0010] In order to achieve the above object, the technical scheme of the utility model is as follows:

[0011] A kind of caustic potash sealing device of calcium carbide method chloroethylene converter replacement discharge pipe, comprising:

[0012] Caustic potash sealing tank, its top is provided with jack, and the converter vent pipe of conversion system is inserted into the inner wall bottom of caustic potash sealing tank through jack;

[0013] Vent pipe, it is arranged at the top of caustic potash sealing tank;

[0014] Alkali discharge pipe, it is arranged on the liquid outlet at the bottom of caustic potash sealing tank.

[0015] The alkali discharge pipe is connected with sewage treatment system by the fifth valve.

[0016] The caustic potash sealing tank top is provided with alkali pipeline, and the alkali pipeline is connected with alkali supply system by the fourth valve.

[0017] The conversion system comprises:

[0018] Converter, its outlet end is connected with converter vent pipe by converter outlet pipe and third valve, and its inlet end is connected with converter inlet pipe and nitrogen pipe respectively, and first valve is arranged on converter inlet pipe, and sixth valve is arranged on nitrogen pipe.

[0019] Second valve is further arranged on the outlet end of the converter, and the second valve is further arranged on the outlet end of the converter.

[0020] The utility model has the advantages of:

[0021] 1、the caustic potash sealing tank of the utility model is closed storage tank, and a certain liquid level sodium hydroxide lye is added in caustic potash sealing tank, and converter vent pipe is led to below the lye liquid level of caustic potash sealing tank, realizes the full contact reaction of hydrogen chloride in lye in the converter purging process, and the caustic potash sealing tank top is provided with vent pipe, and the inert gas of reaction is discharged, and the caustic potash sealing tank top is provided with alkali pipeline, and valve control is arranged on pipeline, and alkali discharge pipe is arranged at the bottom of caustic potash sealing tank, when the concentration of lye or PH is low in the daily operation process, waste lye in caustic potash sealing tank is discharged to sewage treatment system, and fresh lye is added in caustic potash sealing tank to absorb hydrogen chloride.

[0022] 2、the utility model is provided with vent pipe at the outlet of converter, and vent pipe is led to caustic potash sealing tank, and according to water seal principle, fresh lye is added in caustic potash sealing tank to absorb hydrogen chloride brought in the purging process, realizes the recovery of hydrogen chloride, and inert gas is discharged through vent pipe of caustic potash sealing tank, can avoid the existing problem in background, guarantees the civilized production of operating site, and guarantees the health of operating personnel. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model is further explained in connection with drawings and examples as follows:

[0024] Figure 1 The utility model discloses a schematic diagram of the utility model;

[0025] In the drawing: 1 - converter;2 - alkali seal tank;3 - converter import pipe;4 - first valve;5 - converter export pipe;6 - second valve;7 - converter vent pipe;8 - third valve;9 - alkali pipeline;10 - fourth valve;11 - vent pipe;12 - alkali discharge pipe;13 - fifth valve;14 - nitrogen pipe;15 - sixth valve. DETAILED DESCRIPTION

[0026] In order to make the utility model's purpose, technical scheme and advantage more clear and obvious, below combining with specific embodiment and referring to attached drawing, the utility model is explained in further detail. It should be understood that these descriptions are only exemplary, and are not to limit the scope of the utility model. Moreover, in the following explanation, the description of known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0027] As Figure 1 Shown in the figure, a calcium carbide method chloroethylene converter replacement discharge pipe's alkali seal device, include: alkali seal tank 2, its top portion is provided with the jack, and the converter vent pipe 7 of conversion system is inserted into the inner wall bottom of alkali seal tank 2 through the jack, and vent pipe 11 is arranged at the top of alkali seal tank 2, and alkali discharge pipe 12 is arranged on the bottom liquid outlet of alkali seal tank 2, and alkali discharge pipe 12 is connected with sewage treatment system through fifth valve 13, and alkali pipeline 9 is arranged at the top of alkali seal tank 2, and alkali pipeline 9 is connected with alkali supply system through fourth valve 10.

[0028] As Figure 1 Shown in the figure, conversion system, including: converter 1, its export end is connected with converter vent pipe 7 through converter export pipe 5 and third valve 8, and import end is connected with converter import pipe 3 and nitrogen pipe 14 respectively, and first valve 4 is arranged on converter import pipe 3, and sixth valve 15 is arranged on nitrogen pipe 14, and still be provided with external discharge pipe on the export end of converter 1, and second valve 6 is arranged on external discharge pipe.

[0029] The utility model is in use, close converter 1 import first valve 4 and second valve 6, close fifth valve 13 on the bottom of alkali seal tank 2, open fourth valve 10 on alkali pipeline 9 at the top of alkali seal tank 2, give alkali seal tank 2 alkali liquid level to 70%, open third valve 8 on converter vent pipe 7, open sixth valve 15 on nitrogen pipeline 14, through the opening of sixth valve 15 control, monitor converter export pressure and keep between 40Kpa-60Kpa and carry out blowing replacement, when the PH value of alkali seal tank 2 is ≤6, need timely replace alkali, and replace alkali and need close sixth valve 15, and repeat the above operation after replacing to continue operating.

[0030] The alkali sealing device of the calcium carbide method chloroethylene converter replacement discharge pipe can be realized by the above operation method, hydrogen chloride in the blowing process of the converter can be neutralized and recovered, and the problems in the background can be avoided.

[0031] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all changes and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. An apparatus for sealing a displacement vent of a calcium carbide method vinyl chloride converter with an alkali, characterized by, The application relates to a waste water treatment system. The alkali tank (2) is provided with a top insertion hole, and a converter vent pipe (7) of a conversion system is inserted into the inner wall bottom of the alkali tank (2) through the insertion hole. The vent pipe (11) is arranged at the top of the alkali tank (2). The alkali discharge pipe (12) is arranged at the bottom liquid discharge port of the alkali tank (2).

2. A caustic seal apparatus for a displacement vent tube of a calcium carbide method vinyl chloride converter as defined in claim 1, characterized by: The alkali discharge pipe (12) is connected with a waste water treatment system through a fifth valve (13).

3. A caustic seal for a displacement vent tube of a calcium carbide method vinyl chloride converter as defined in claim 1, characterized in that: The alkali tank (2) is provided with an alkali pipe (9) at the top, and the alkali pipe (9) is connected with an alkali supply system through a fourth valve (10).

4. A caustic seal apparatus for a calcium carbide method vinyl chloride converter displacement vent pipe according to claim 1, characterized in that, The conversion system comprises: A converter (1) is connected with a converter vent pipe (7) through a converter outlet pipe (5) and a third valve (8) at the outlet end, and is connected with a converter inlet pipe (3) and a nitrogen pipe (14) at the inlet end; a first valve (4) is arranged on the converter inlet pipe (3), and a sixth valve (15) is arranged on the nitrogen pipe (14).

5. A caustic seal for a displacement vent tube of a calcium carbide method vinyl chloride converter as defined in claim 4, characterized in that, An external discharge pipe is further arranged on the outlet end of the converter (1), and a second valve (6) is arranged on the external discharge pipe.

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