Pulse reverse blowing ash removal device of ceramic filter

Abstract

The invention relates to a pulse reverse blowing ash removal device of a ceramic filter. The pulse reverse blowing ash removal device is characterized in that a filtering unit and an air collecting chamber are arranged on a tube plate of the filter; a clean gas chamber is arranged at the upper part of the tube plate of the filter, and a dusty gas chamber is arranged at the lower part of the tube plate of the filter; the pulse reverse blowing ash removal device comprises a reverse blowing gas storage tank; a reverse blowing pipeline which is in tight coupling with the top of the gas collecting chamber of the filtering unit is arranged on the reverse blowing gas storage tank; a pulse reverse blowing valve is arranged in the reverse blowing pipeline; a clean gas leading-out pipeline is connected on the reverse blowing pipeline between the top of the gas collecting chamber and the pulse reverse blowing valve, and an outlet end of the clean gas leading-out pipeline is arranged in the clean gas chamber; a dust concentration monitoring meter, a gas outlet control valve and a flow meter are arranged in the clean gas leading-out pipeline; and a differential pressure sensor is arranged between the dusty gas chamber and an outlet at the top end of the gas collecting chamber of the filtering unit. The pulse reverse blowing ash removal device provided by the invention can realize the cyclic regeneration of a ceramic filter tube by adopting a lower reverse blowing pressure and reduces the possibility of fracture failure of the ceramic filter tube.

Description

technical field [0001] The invention relates to a gas-solid separation device, in particular to a low-pressure pulse backflushing ash cleaning device of a ceramic filter. Background technique [0002] High-temperature gas dedusting is a technology that directly separates gas and solid under high temperature conditions to realize gas purification. It can maximize the use of physical sensible heat, chemical latent heat and kinetic energy of gas, improve energy utilization, and simplify the process at the same time. Save equipment investment. [0003] Among the clean coal technologies with the most development potential, various coal-fired power generation technologies represented by integrated coal gasification combined cycle (IGCC) and pressurized fluidized bed combined cycle power generation (PFBC-CC) and coal gasification as the leader Coal chemical polygeneration technology involves high temperature gas dust removal. A common problem encountered in the commercial develop...

AI Technical Summary

Problems solved by technology

The high-temperature ceramic filters currently used often cause the downstream concentration to rise sharply due to the breakage of the ceramic filter tube, causing the device to be shut down

The design of the existing pulse blowback device and the high-pressure pulse cleaning operation are not conducive to the long-term stable operation of the filter, and there are the following main problems:

[0008] (2) Only the timing backflushing method can be used, and the backflushing parameters cannot be dynamically adjusted: due to the design of the filter structure, the pressure difference of each filter unit cannot be determined during operation, and it can only be based on operating experience and according to the preset The blowback cycle is used to start the blowback device at regular intervals

[0009] (3) The failure of the broken filter tube seriously affects the follow-up process: even if a ceramic filter tube breaks, the crude synthesis gas on the dusty gas side will enter the clean gas side through the broken ceramic filter tube, and the air flow "short circuit" phenomenon occurs, making The dust concentration in the downstream gas increases sharply, forcing the entire device to shut down, seriously affecting the subsequent production process

[0010] (4) The "backflow" phenomenon affects the recycling performance of the ceramic filter tube: when the pulse backflush is close to the end, the velocity of the backflush gas gradually decreases. The gas near the outer wall of the tube will flow back from the outside of the tube through the tube wall to the inside of the tube, so that the solid particles that have been blown off from the outer wall of the filter tube will settle on the outer wall again, and even some small particles will be embedded in the filter tube. In the tube wall, it affects the filtration quality and efficiency of the next filtration cycle and reduces the service life of the filter tube

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