Device and method for quality control on tar from pyrolysis of low-rank pulverized coal

Abstract

The invention relates to a device and method for quality control on tar from pyrolysis of low-rank pulverized coal. The device comprises a pyrolysis furnace and a high-temperature dust collector, wherein a pyrolysis chamber and a pre-settlement gas chamber of the pyrolysis furnace are separately provided with independent combustion heating systems, so that precise control on the temperature of theupper layer and lower layer is achieved, and the pyrolysis effect of the low-rank coal is better; a catalyst loading nickel oxide, alumina and other active components is filled in an intermediate packing layer of a filter element in the dust collector, dust can be filtered, and meanwhile catalytic reforming of tar oil is realized, so that the quality of the tar is improved; and a thermal-insulating layer and a temperature regulating flue layer are arranged outside the devices, so that precise regulation of the temperature of coal pyrolysis and product dust removal process is facilitated more.

Description

technical field [0001] The invention belongs to the technical field of energy, in particular to the technical field of pyrolysis of small particle size and low-order pulverized coal. Background technique [0002] Lignite and bituminous coal with a low degree of metamorphism (long-flame coal, non-caking coal, weakly caking coal, etc.), due to the short coal-forming age, are usually called low-rank coal or young green coal. They are rich in resources and are the main coal for power coal in my country. kind. Compared with other coal types, the macromolecular structure of low-rank coal is rich in high-value volatile components. Direct combustion of coal for power use is likely to cause waste of resources, and may cause certain environmental pollution problems due to insufficient combustion. . For low-rank coals, the high-value-added volatile components are first obtained through medium-low temperature pyrolysis (500-800°C), and then the residual high-carbon solids are burned, g...

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Problems solved by technology

[0003] For low-rank coal pyrolysis at medium and low temperatures, the internal heating type vertical furnace pyrolysis process is commonly used in industry, and the raw material used is 30-80mm lump coal. There are many technology research and development, but there is no mature industrial technology at present. The main reason is that the pyrolysis process of low-rank pulverized coal and fine coal faces serious dust entrainment during the pyrolysis process, and there are many heavy components in the tar with poor quality. Technical problems of difficult separation of oil and dust

[0004] In the prior art control method for producing high-quality oil and gas products by pyrolysis of low-rank coal, the flues for temperature control of the upper and lower layers of the pyrolysis furnace are connected, and the temperature control will affect each other, and there are inconveniences in operation and inaccurate accuracy. Guaranteed conundrum

On the other hand, the catalyst added for pyrolysis of coal and the catalyst placed in the upper gas chamber with regulating effect cannot be recovered and are difficult to replace

[0005] At the same time, the applicability of the existing dust removal technology to pyrolysis raw gas dust removal is mixed, mainly because the material is difficult to withstand high temperature, the temperature field is unstable, tar is easy to condense and precipitate, and adheres to the dust collector and pipeline

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