Online cleaning basket filter for high-concentration formaldehyde pipeline in production technology of trioxymethylene

Abstract

The invention discloses an online cleaning basket filter for a high-concentration formaldehyde pipeline in the production technology of trioxymethylene. The basket filter comprises a basket filter body, a scraping jet cleaner, a hollow cleaning support rod I, a hollow cleaning support rod II, a hand wheel, a transmission rod and a transmission force distribution plate; a sealing cover is arrangedat the upper open end of the basket filter body, the hollow cleaning support rods I and the hollow cleaning support rod II respectively vertically go through the sealing cover and are connected with the scraping jet cleaner, the top ends of the hollow cleaning support rod I and the hollow cleaning support rod II are located at the upper part of the sealing cover and are respectively connected withthe lower end of the transmission rod through the transmission force distribution plate, the upper end of the transmission rod is connected with the hand wheel, and the hand wheel is located at a power support at the upper part of the sealing cover. The basket filter can realize online cleaning at any time without affecting the running of a system, and also can realize closed cleaning in order toeffectively control the pollution of toxic and harmful media to the environment and the occupational health of operators. The basket filter prolongs the overhaul period to one year or above in orderto greatly reduce the workload of the operators.

Description

technical field [0001] The invention relates to the technical field of chemical material production, in particular to an online cleaning basket filter for high-concentration formaldehyde pipelines in a paraformaldehyde synthesis process. Background technique [0002] Trioxane is an important intermediate in the production of polyoxymethylene copolymers. Paraformaldehyde (C 3 h 6 o 3 ) is catalyzed by sulfuric acid, with a high concentration of formaldehyde (CH 2 O) is that raw material is synthesized in large-scale vertical vessel reactor. The concentration of the high-concentration formaldehyde is between 68%wt. and 71%wt. [0003] The preparation of high-concentration formaldehyde is realized by the formaldehyde concentration device. Using the principle of flash evaporation, 45% wt. formaldehyde is separated from high-concentration and low-concentration in the flash tank. After the high-concentration formaldehyde is accumulated in the buffer tank, it is transported by...

AI Technical Summary

Problems solved by technology

[0014] 1. The existing basket filter lacks a clogging detection device, and the clogging problem is indirectly reflected by the insufficient delivery capacity of the delivery pump. The blindness is strong, and the delivery pump is prone to cavitation, which reduces the service life of the delivery pump

[0015] 2. The pump needs to be reversed frequently. The continuous operation period of the pump is 3 to 4 days, which is far lower than the optimal continuous operation time of the delivery pump of 90 days. The mechanical failure rate of the delivery pump is high

[0016] 3. Frequent cleaning and replacement will lead to a large amount of hot water for cleaning into the above reactor, reducing the concentration of raw materials in the reactor and affecting the output of the reactor

[0017] 4. Frequent disassembly, fast wear of filter gasket and sealing surface, high replacement rate of accessories, high operating cost

[0018] 5. Residual formaldehyde in the basket filter and paraformaldehyde particles in the filter basket have a strong pungent odor, are carcinogenic and toxic, seriously pollute the environment, and seriously damage the health of workers

[0019] 6. The above-mentioned dismantling and inspection process is cumbersome, the workload is heavy, and the labor intensity of the operators is high

[0020] To sum up, in the existing paraformaldehyde production process, the intermittent cleaning method of the basket filter used in the high-concentration formaldehyde pipeline has the lack of effective monitoring of the clogging of the filter basket, the high failure rate of the delivery pump, the large impact of dismantling and inspection on production, the rapid consumption of accessories, and the difficulty of operation. There are a series of problems such as poor on-site environmental conditions and heavy dismantling and inspection workload. Therefore, it is necessary to study an online cleaning basket filter for high-concentration formaldehyde pipelines in the paraformaldehyde production process.

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