High-temperature gas dust removal in coal chemical industry
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This post was last edited by liaifeng on 2018-7-28 07:39. In the production of coal chemicals and during the process of coal carbonization, there is a problem related to the separation of gas from dust. Separation at low temperatures is very difficult, as tar precipitates at such temperatures and mixes with the dust. Separation can only be carried out at high temperatures, when the tar is still in a gaseous state. However, there are not many materials available for dust removal at high temperatures, and various factors affect the filtering process. I happen to have a filtering material that solves this problem.
The promotion and development of a new product both require a process, and acceptance also needs time to be proven. Domestic technology is still in the experimental stage; high-temperature dust removal is beneficial to both the country and its people. At present, it is known that high-temperature dust removal ceramic filters above 600°C are imported. Several research institutes in the country are conducting in-depth development of new materials; among these, the most maturely developed so far is the porous metal filter element made of iron-aluminum alloy. This material can withstand temperatures above 800°C, and it also possesses excellent seismic resistance, mechanical workability, as well as resistance to hydrogen embrittlement at high temperatures.
The main thing to control is the precipitation of carbon particles after tar conversion, as this can cause blockages in the filter cartridges; otherwise, the dust removal system will fail due to excessive resistance. It’s better to consider using high-temperature electrostatic dust removal instead
Under high-temperature conditions, due to significant changes in viscosity, humidity drops sharply, and the agglomeration of fine particles is greatly reduced, making it more difficult to separate the particles. Engineering issues such as the material and structural design of equipment used at high temperatures, as well as thermal expansion, often affect the effective and proper operation of the equipment. Among various gas-solid separation technologies, the sintered porous metal filtration technique makes the most of the gas’s sensible heat and useful energy sources, while simplifying the process flow and reducing equipment costs. Furthermore, the sintered porous metal filtration technology offers significant advantages, including improved product purity, increased production volume, elimination of emission pollution (reducing or avoiding air pollution), protection of critical downstream equipment, as well as energy savings and cost reduction.
High-temperature ceramic fiber filters have been manufactured in China: 1000 degrees, 5 milligrams, Mr. Shao from Aibo Fibers