Method for catalyzing gasification reaction by using concentrated carnallite solution

Abstract

The invention provides a method for catalyzing a gasification reaction by using a concentrated carnallite solution and relates to the field of catalytic coal gasification. The concentrated carnallitesolution is loaded to coal powder as a catalyst raw material, and coal gasification reaction is catalyzed by using alkali metal ions and / or alkaline-earth metal ions in coal chemical industry treatment rear-end wastewater; meanwhile, organic matters such as phenols and polycyclic aromatic hydrocarbons remaining in the concentrated carnallite solution can also participate in the coal gasification reaction, so that the gas yield is increased. By the method, the recovery and reutilization of carnallite wastewater can be achieved, the coal gasification reaction can also be promoted, and the resource-converting utilization of the wastewater is achieved. The method comprises the steps: providing the concentrated carnallite solution, wherein the concentrated carnallite solution comprises carnallite and organic matters, and metal ions of the carnallite comprise the alkali metal ions and / or alkaline-earth metal ions; loading the metal ions and organic matters of the carnallite to the coal powder; carrying out drying treatment on the metal ion and organic matters loaded coal powder; conveying the dried coal powder into a gasifier for the gasification reaction.

Description

technical field [0001] The invention relates to the field of coal catalytic gasification, in particular to a method for catalyzing coal gasification reaction by using a concentrated miscellaneous salt solution. Background technique [0002] Coal chemical industry wastewater has the characteristics of large amount of wastewater, complex water quality, a large amount of organic matter such as phenols and polycyclic aromatic hydrocarbons, and high salt content; and according to environmental protection requirements, enterprises need to achieve zero discharge of wastewater. Obviously, the treatment of coal chemical wastewater has become a bottleneck restricting the development of coal chemical industry. [0003] In the prior art, coal chemical wastewater usually undergoes several treatment processes including physical and chemical pretreatment + biochemical treatment + advanced treatment, and the final concentrated brine is evaporated and crystallized to meet the treatment requi...

AI Technical Summary

Problems solved by technology

The movement trend of small molecules and ions on both sides of the nanofiltration membrane is to permeate from the side of high concentration to the side of low concentration, so there is a certain osmotic balance, so the recovery rate of wastewater is low, generally about 60%, and there are still 30-40% of concentrated brine needs to be treated, and the treatment volume is still large

Moreover, because the remaining concentrated brine to be treated often has a high salt content and a high concentration of organic matter, the treatment is more difficult

[0004] In addition, the salinity in the concentrated brine before reverse osmosis treatment is mainly NaCl, Na 2 SO 4 Mainly, the nanofiltration membrane concentration process is used to combine NaCl and Na 2 SO 4 Separation and refraction crystallization, due to Cl - The ions are small, so the NaCl crystallized from the NaCl mother liquor has a high purity and can be directly reused for the deion exchange section; while SO 4 2- Larger ions, Na 2 SO 4 A large amount of organic matter and a small amount of impermeable Cl remain in the mother liquor - ions, which form NaCl, for Na 2 SO 4 The purity of the mother liquor for crystallization is not high, Na 2 SO 4 It is more difficult to deal with miscellaneous salt, which has become a major problem restricting the environmental protection of factories. It is urgent to find an efficient solution

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