A kind of flux that reduces the melting point temperature of fly coal gasification ash and its application method

Abstract

The invention discloses a flux for reducing a fine coal gasification ash melting point temperature and a use method thereof and belongs to the field of fluxes. The flux is papermaking sludge, contains organic matters, has air-dried base heat of 800-1000 kcal / kg and alkaline oxide mass content more than 50% and comprises, by mass, 40-56% of CaO, 3-12% of MgO, 3-12% of Al2O3, 9-15% of Fe2O3, 14-20% of SiO2, less than 3% of SO3, less than 0.8% of TiO2, less than 1% of each one of alkali metal oxides and a small amount of impurities. The use method of the flux comprises that when a raw material coal deformation temperature is less than 1450 DEG C, a flux use ratio is in a range of 6-15%, and when the raw material coal deformation temperature is higher than 1450 DEG C, a flux use ratio is in a range of 15-30%. The flux can effectively reduce a coal ash melting point, realize resource utilization of papermaking sludge waste and realize utilization of papermaking sludge heat.

Description

technical field [0001] The invention belongs to the field of flux. Background technique [0002] At present, entrained bed gasification technology has become the preferred technology for large-scale and high-efficiency coal gasification at home and abroad, and its slag discharge method is mainly liquid slag discharge. Liquid slag discharge requires the flow temperature of the ash to be less than 1400°C. If the ash melting point is too high, it will reduce the life of the refractory material and cause many problems to the normal operation of the device. my country is rich in coal resources, and a large amount of coal is high-ash melting point coal. In order to make coal with high ash melting point also be applied to the liquid slagging gasification process, the ash melting temperature is generally reduced by adding an economical and easy-to-obtain flux or using it with a coal with a low coal ash melting temperature in a certain proportion. Among them, adding Economical and ...

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Problems solved by technology

At present, landfill is the main way to deal with it, and only part of it is comprehensively utilized, which not only wastes a lot of land resources, but also produces secondary pollution.

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