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Digestion system and digestion method for preparing super clean coal

An ultra-clean, pulverized coal technology, which is applied in the field of digestion systems for preparing ultra-clean coal, can solve the problems of poor economy, large amount of waste liquid discharged, and high energy consumption, and achieve the effects of low ash content and energy saving

Pending Publication Date: 2018-01-23
YANKUANG GRP CO LTD +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] However, for the Australian Auscoal process to prepare UCC technology, the most critical step—digestion process is in the laboratory stage in related research at home and abroad, there is no actual industrialized system or design case, and the laboratory experiment process adopts a relatively simple Heating and constant temperature cooling process is not feasible for industrialized systems; at the same time, high energy consumption, large amount of waste liquid discharged outside, and poor economy

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  • Digestion system and digestion method for preparing super clean coal

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Embodiment 1

[0079] see figure 1 , figure 1 A schematic structural diagram of a digestion system for preparing ultra-clean coal provided in an embodiment of the present invention. Among them, A1 is a fluid mixing and conveying device, B1~B9 are heat exchange devices, B10 is a constant temperature reaction heater, A2~A3 are digestion reactors, B12~B20 are decompression tanks, B21 is a surge tank, A4 is the first filter, A5 is the condensate storage tank, A6 is the second filter, and B11 is the low-pressure flash tank.

[0080] The working process of the digestion system for preparing ultra-clean coal provided by embodiment 1 is specifically:

[0081] (1) Mix coal powder S17 and lye S13 in A1 to form an alkaline suspension, and then pressurize and transport to obtain a pressurized alkaline suspension S14; the pressure is increased to maintain the highest digestion reaction temperature. Boiling, S14 pressure is 30bar, temperature is 66.8°C, flow rate is 125.75kg / h.

[0082] (2) S14 passes...

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Abstract

The invention provides a digestion system and a digestion method for preparing super clean coal. Compared with the prior art, the digestion system and the digestion method, which are provided by the invention, for preparing the super clean coal are characterized in that hot gas produced by staged pressure reduction is used for segmented heating, and a cold material, subjected to heat exchange, istreated by means of flash evaporation and is then washed; furthermore, discharged waste liquid is fully recycled, so that the digestion system and the digestion method for preparing the super clean coal has the characteristics of being low in energy consumption and small in amount of the discharged waste liquid. Experimental results prove that compared with the prior art, the digestion system andthe digestion method which are provided by the invention can save energy by 74% and reduce the wastewater emission by 30%, thus having better economy and being suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of ultra-clean coal preparation, and more specifically relates to a digestion system and method for preparing ultra-clean coal. Background technique [0002] At present, the large-scale development and utilization of coal has brought serious ecological environment damage and pollutant discharge problems, and the clean utilization of coal is facing great pressure and challenges. The clean utilization of coal in my country is developing rapidly. A variety of new coal gasification technologies are applied in the field of coal conversion. Large-scale coal-to-oil, coal-to-ethylene glycol, and coal-to-olefins units have entered the industrial demonstration stage. Although my country has mastered a number of core technologies for clean coal utilization, the overall level of clean coal utilization is not high, and its development is limited by technology, policies and funds. [0003] Ultra Clean Coal (UCC for short...

Claims

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Application Information

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IPC IPC(8): C10L5/02C10L9/02
Inventor 韩梅王富奇郭宝贵路文学张彦吴永国邢涛张俊先李磊李智尹洪请
Owner YANKUANG GRP CO LTD
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