Stock bin degassing control system

Abstract

The invention discloses a stock bin degassing control system and belongs to the field of chemical equipment. The degassing control system comprises a plurality of groups of degassing stock bins and degassing fans, wherein the degassing stock bins and the degassing fans are arranged one by one. The degassing fans are connected with the degassing stock bins. A heat exchange device and a filter are arranged between the degassing stock bin and the degassing fan in each group. Each degassing fan is provided with a frequency converter. First timers and second timers connected in parallel are connected to the frequency converters. The first timers and the second timers conduct synchronous timing. The triggering time when stopping of the frequency converters is triggered by the second timers is larger than the triggering time when frequency reduction of the frequency converters is triggered by the first timers. The stock bin degassing control system has the technical effects that energy consumption can be lowered by lowering the degassing air volume; when a certain degassing fan fails, operation of the whole stock bin degassing control system is not affected, and both overhauling and operation are facilitated.

Description

technical field [0001] The invention relates to a material bin degassing control system in the field of chemical equipment. Background technique [0002] In the production process of vinyl acetate and low-density polyethylene copolymer resin pellets, after polymerization and granulation processes, there are still a large amount of monomer volatiles such as ethylene and vinyl acetate remaining in the resin pellets, and they are continuously precipitated. , the accumulation and residue of these volatile components will cause safety problems in the production process, so it is necessary to set up a set of silo degassing control system, whose function is to pass a large amount of air within a certain trigger time to degas the vinyl acetate and vinyl acetate in the degassing silo. Low-density polyethylene copolymer resin pellets are blown back, the volatiles are removed and brought into the downstream regenerative thermal incinerator system (RTO) for harmless treatment, and the f...

AI Technical Summary

Problems solved by technology

[0003] In the original silo degassing control system, when the silo is in the three states of full, half, and empty, the degassing air volume provided by the degassing fan to the silo remains unchanged, and the rated degassing air volume is used for supply, resulting in degassing Waste of air volume and waste of energy consumption

[0004] On the other hand, there are dozens of grades of vinyl acetate and low-density polyethylene copolymer resin pellets, and pellets of different grades can only be stored in different silos for degassing, resulting in a large number of degassing silos. There are more than 10, so the required degassing air volume is very large

The original silo degassing control system uses the degassing fan station, that is, the degassing fan and the degassing silo are not in one-to-one correspondence, usually several degassing silos correspond to one degassing fan, this design is likely to cause single The power and volume of each degassing fan are very large. When any degassing fan stops, it will have a great impact on the entire silo degassing control system, and the interlocking control of the degassing fan network is complicated, which is not conducive to operation. Insufficient security and stability

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