A membrane dedusting device and a coal pyrolysis process using the membrane dedusting device

Abstract

The invention discloses a film dedusting device which comprises an inertial dedusting chamber, a film dedusting chamber, a back-flushing gas heater and at least a film dedusting pipe. The upper part of the inertial dedusting chamber is provided with a dust-laden gas inlet, and the bottom of the inertial dedusting chamber is provided with a first dust outlet. The top of the film dedusting chamber is equipped with a clean gas outlet, and the bottom of the film dedusting chamber is provided with a second dust outlet. The film dedusting pipes are arranged inside a cavity of the film dedusting chamber. The back-flushing gas heater is communicated with the film dedusting pipes. The film dedusting device is characterized in that the inertial dedusting chamber and the film dedusting chamber share a sidewall which is provided with at least a sidewall opening; and a baffle plate is arranged inside a cavity of the inertial dedusting chamber, opposite to the dust-laden gas inlet. According to a coal pyrolysis technology, high-temperature gas and dust separation is realized by the utilization of the film dedusting device. Thus, the problem of high dust content in tar and gas is solved. By the utilization of a multitubular rotary kiln, complete pyrolysis of 0-20 mm powdered coal is realized so as to obtain a high-quality product. By an oil wash device, content of phenol in wastewater is effectively reduced.

Description

technical field [0001] The patent of the present invention relates to a dust removal device and a pyrolysis process in the field of low-rank coal quality improvement, especially a membrane dust removal device and a coal pyrolysis process using the membrane dust removal device. Background technique [0002] Coal pyrolysis, also known as coal dry distillation and thermal decomposition, refers to the complex process in which coal is heated under the condition of isolating air, and a series of physical changes and chemical reactions occur in coal at different temperatures, resulting in the formation of gas (gas ), liquid (coal tar), solid (semi-coke or coke) and other products. Pyrolysis is a key step in coal conversion. Coal gasification, liquefaction, coking and combustion all go through or occur in the process of pyrolysis. Low-temperature pyrolysis technology has become a subject of intense research in the energy industry because of its ability to extract liquid fuels and c...

AI Technical Summary

Problems solved by technology

The vertical square furnace pyrolysis process is a relatively mature pyrolysis process, but it is mainly used for the production of semi-coke, which requires the particle size of the raw coal to be greater than 20mm, and it cannot handle pulverized coal below 20mm, and there are problems such as low tar yield and poor gas quality; solid heat Although the carrier rapid pyrolysis process has the advantages of fast heating rate and high energy utilization efficiency, there are problems of uniform mixing of heat carrier and coal, continuous cycle operation and reasonable distribution of heat carrier; The kiln is the main machine, with small heat transfer area and low processing capacity; moreover, the above coal pyrolysis technologies are basically in the pilot test or industrial demonstration stage, and there is no large-scale industrial operation technology. The main reason is: high-temperature tar gas generated by pyrolysis It is difficult to achieve high-efficiency separation of the entrained dust, which brings about equipment and pipeline blockage problems. It is difficult to achieve continuous operation of the pyrolysis system, which hinders the promotion of pyrolysis technology.

Images