Fluxing agent for reducing melting point of coal ash

Abstract

The invention discloses a fluxing agent for reducing the melting point of coal ash. The fluxing agent is composed of the following components in percentage by weight: 20-90% of organic matter, 0-70% of CaO, 1-40% of MgO, 0-50% of Fe2O3, 0-30% of Na2O and 0-30% of K2O. The fluxing agent effectively increases the amount of a liquid phase generated by ash fusing, and improves the high-temperature fluidity of ash slag; the softening point is low, and the formation of an eutectic system can be promoted; the ash melting point can be reduced, and meanwhile, organic hazardous wastes are used for producing H2 / CO and the like to save feed coal; organic matters are used as a binder and a water repellent agent, so that the addition amount of the ash melting point reducing additive can be greatly higher than that of other ash melting point reducing additives, and the yield of effective gas is not influenced; the phenomenon that the addition amount of limestone is increased and the melting point ofcoal ash is increased is avoided. The fluxing agent solves the problems of high coal ash melting point, high treatment cost and the like of difficult-to-gasify coal (such as Huainan coal) with high ash melting point.

Description

technical field [0001] The invention relates to the technical field of liquid slag removal, in particular to a flux for lowering the melting point of coal ash. Background technique [0002] In order to reduce the negative impact of coal on the environment, the development of clean coal technology is an important way to improve coal utilization efficiency and reduce environmental pollution. It includes gasification technology, synthetic fuel technology, including alcohol fuel and hydrocarbon fuel, etc. In these technologies, whether the ash and slag can be discharged smoothly is the key to the smooth operation of the device. Coal gasification devices represented by Shell pulverized coal gasification and Texaco coal-water slurry pressurized gasification all adopt liquid slag removal technology, which has certain requirements on the melting point of coal ash. Liquid slag discharge requires that the coal ash melting temperature is lower than the operating temperature, and the ...

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Problems solved by technology

Therefore, using limestone as a coal ash flux has the disadvantages of adding a large amount and not being suitable for extremely high coal ash melting points

[0007] CN1970698A has reported the use of CaCO 3 , Fe 2 o 3 , MgCO 3 Three-component fluxes have achieved certain results, but compared with pure limestone fluxes, Fe 2 o 3 powder and MgCO 3 The cost is relatively high, and the sulfur content in the raw materials is required to be low, and some existing solid wastes cannot be fully utilized, such as iron ore slag and carbonate minerals with high sulfur content, let alone desulfurized gypsum and other solids from power plants. waste

[0011] In order to solve the problems of high ash melting point and difficult gasification coal, such as Huainan coal, which has a high ash melting point and high processing cost, the present invention provides a flux that reduces the coal ash melting point

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