Method and device for on-line cleaning of blockage at source point of meter

Abstract

The present disclosure provides an online cleaning method and device for blockage of the meter source point, the steps include: connecting one end of the working fluid pipe to the vent pipe of the working fluid filter, and connecting the other end to the meter source point of the equipment to be cleaned; Open the valve of the empty pipe, and use the working fluid to replace the air in the working fluid pipe; after the replacement is completed, close the valve of the empty pipe when the pressure in the working fluid is consistent with the pressure of the working fluid filter; open the valve at the source point of the instrument , so that the working fluid flows into the inside of the source point of the instrument for cleaning; taking advantage of the high temperature of the working fluid and the characteristics of effectively dissolving hydrogen anthraquinone, the working fluid is injected into the pressure measuring point of the hydrogenation tower, and the pressure is naturally released after dredging, which solves the problem of hydrogenation. The precipitation of anthraquinone causes the problem that the pressure cannot be accurately measured. At the same time, it does not need to stop and dredge to reduce production costs and improve the benefits.

Description

technical field [0001] The disclosure relates to an online cleaning method and device for blockage of a meter source point. Background technique [0002] The preparation of hydrogen peroxide by the anthraquinone method is currently used as a widely used preparation method, with 2-ethylanthraquinone as the carrier, and heavy aromatic hydrocarbons and trioctyl phosphate as the solvent to prepare a mixed liquid working solution. The working fluid is hydrogenated with hydrogen in a fixed bed at a certain temperature and pressure under the catalysis of a palladium catalyst. After the hydrogenation is completed, the liquid is oxidized with oxygen in the air. The oxidized liquid obtained is extracted and purified with pure water. Hydrogen peroxide, the working solution is recycled after alkaline washing. [0003] The hydrogenation tower runs for a certain period. Since the liquid at the pressure measuring point does not flow, anthraquinone is easy to precipitate, resulting in inac...

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Problems solved by technology

[0003] The hydrogenation tower runs for a certain period. Since the liquid at the pressure measuring point does not flow, anthraquinone is easy to precipitate, resulting in inaccurate pressure measurement, and the pressure of the hydrogenation tower is the most important safety indicator for the hydrogen peroxide process.

Since the pressure point of the hydrogenation tower is a single-phase low-inlet and high-outlet stop valve, the existing technology uses steam to heat the valve to melt the hydroanthraquinone, but the effect is not good. When the anthraquinone precipitation is serious, the pressure point can only be dredged when the device is overhauled.

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