Dust removing process of high-temperature gas with high tar and high dust

Abstract

The invention discloses a dust removing process of high-temperature gas with high tar and high dust. Related equipment comprises a blowing gas delivery pipe, a blowing valve and a nozzle, wherein the blowing valve is connected with a pressure difference detection device, and the blowing gas delivery pipe is communicated with high-temperature pressurization gas; when a filter element of a dust remover performs filtering in the positive direction, the gas pressure difference between the inside and the outside is detected by the pressure difference detection device; when the gas pressure difference reaches a preset threshold, the blowing valve is started for blowback dust removal; the blowing gas temperature is controlled to be more than 290 DEG C in the blowback dust removing process, and blowing gas forms a high-pressure expansion area in the filter element to quickly and reversely blow and remove gathered dust which is attached to the outside of the filter element; the filter process of the filter element in the positive direction is restored after the blowback dust removing process is completed. By using the dust removing process, the high-temperature blowback dust removal is realized, the dust removing process is optimized, the heat utilization rate is increased, the blowback can be intelligently controlled to guarantee continuous high-quality filtering of the filter element, the dust removing efficiency is improved and the equipment utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of blowing dust removal equipment, in particular to a dust removal process for high-tar and high-dust high-temperature gas. Background technique [0002] At present, my country is short of oil and natural gas resources, and coal will remain the most important primary energy source for a long time to come. However, there are many problems and challenges in the process of coal conversion and utilization, such as low comprehensive utilization efficiency, serious environmental pollution, shortage of water resources, and large carbon dioxide emissions. Therefore, it is an inevitable choice for the development of my country's energy industry to develop coal efficient and clean comprehensive utilization technology to achieve energy conservation and emission reduction. The "Twelfth Five-Year Plan" for the development of clean coal technology and technology, which is encouraged by the state, includes industrial poli...

AI Technical Summary

Problems solved by technology

Among them, after the coal material is decomposed and burned, a large amount of dust-containing gas to be finely processed is produced. In the current dry dust removal process, it is most common to use a dust bag as a fine dust collector. However, the normal working temperature that the dust bag can withstand is usually lower The temperature of dust-removing gas is much lower and it is difficult to transform. In addition, the filter tube structure is used to filter the high-temperature dust-containing gas to realize gas-solid separation and gas purification. The filtered and purified dust-containing gas enters the clean gas chamber, and the dust is filtered and retained. In the dust removal room of the dust collector, it is deposited into the ash hopper, and the outer surface of the filter element used in the dust collector will absorb a large amount of particle dust during the process of filtering and dust removal. As the dust continues to increase, it will affect the filtration quality. To remove the accumulated dust, some manufacturers design to use mechanical dust removal devices, such as installing brushes at the front of the manipulator, or mechanical oscillation methods, but not only the structure is complicated, but also the filter element of the dust collector is easy to be damaged due to poor action consistency. After the filter element is damaged, the dust enters the dust collector The clean gas chamber of the device will bring the polluted and purified gas into the subsequent process, causing great losses

Nowadays, the blowing pipe is commonly used to achieve reverse dust cleaning, but the result of backflushing is that the purified air must enter the space before purification again, and the external gas flow rate is large and the temperature drop is large, which is easy to cause temperature changes and backflushing. If the temperature is too low, it is easy to cause coal tar components to condense and damage the filter element; if the backflush temperature is too high, the backflush valve will have higher production requirements and performance requirements, and the equipment cost will increase; if the backflush pressure is too small, dust will accumulate It cannot be cleaned well, and the reciprocating operation will cause the dust accumulation to become more solid and difficult to remove, so it cannot be completely cleaned and dust removed; too high back blowing pressure will easily generate a large pressure excitation vibration on the filter element and shorten its service life

At present, the operating temperature of the commonly used dust collector generally does not exceed 280°C, and the pressure is relatively small. It is mainly used for bag dust removal, and many backflush temperatures use normal temperature or low temperature air sources, which are difficult to adapt to the temperature requirements of the present invention. Strict medium gas, therefore, further improvements and innovations in filter injection dust removal are urgently needed

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