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A method of using sludge to prepare energy gas and simultaneously detoxifying chromium slag

A technology of energy gas and chromium slag, which is applied in pyrolysis treatment of sludge, removal of solid waste, special form of carbonization, etc., can solve the problem of affecting the flow performance and space size of pyrolysis equipment, inefficient use of tar and chromium slag resources to reduce secondary heat pollution, improve the quality of fuel products, and avoid device control pressure

Active Publication Date: 2018-10-23
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

However, the defect of this process is that on the one hand, tar is easy to coke on the surface of the chromium slag and the furnace wall of the pyrolysis equipment, which makes it difficult to recycle the chromium slag and affects the flow performance and space size of the pyrolysis equipment.
At the same time, the energy consumption of this process is relatively high, and the role of tar as an energy gas is not effectively utilized.

Method used

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  • A method of using sludge to prepare energy gas and simultaneously detoxifying chromium slag

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example 2

[0026] 1. After the chromium slag is ground to <2mm, it is transported to the tail of the rotary electric furnace through the screw feeder, and finally transported to the furnace head. Heating by an electric furnace keeps the temperature of the chromium slag at the furnace head stable at 800-1000°C. After being discharged from the furnace head, the chromium slag enters the internal heating rotary kiln head, and then is transported to the kiln tail;

[0027] 2. The dry sludge is cracked at 500-600°C, and the cracked gas is then sent to the furnace head of the rotary electric furnace, where it is mixed with high-temperature steam and chromium slag outside the furnace head; the mixed gas of high-temperature steam and sludge cracking gas is mixed with chromium in the rotary electric furnace The slag runs in reverse, and a catalytic cracking reaction occurs during the process. After being discharged from the tail of the rotary electric furnace, high-quality energy gas is obtained...

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Abstract

The invention relates to a method for preparing energy source gas from sludge and simultaneously performing harmless treatment on chromium slag. The hazardous waste of chromium slag is used for performing high-temperature catalytic cracking on sludge cracking gas. Meanwhile, the sludge is thoroughly converted into low-molecule energy source gas under the steam gasification condition; the surface coking of the chromium slag is avoided; meanwhile, an energy source product can be more efficient. On the other hand, hexavalent chromium of the chromium slag can be converted into trivalent chromium by the generated energy source gas, and the harmless treatment of the chromium slag is realized.

Description

technical field [0001] The invention relates to a method for preparing energy gas from sludge while detoxifying chromium slag. Through steam gasification and chromium slag catalysis, the sludge cracking gas is further cracked and converted into small molecule energy gas. At the same time, the energy gas generated can efficiently reduce the hexavalent chromium in the chromium slag. Background technique [0002] Chromium slag is a by-product emitted during the production of dichromate. Because it contains water-soluble hexavalent chromium, it is extremely toxic. If it is stacked in the open air without treatment, it will cause varying degrees of pollution to groundwater sources, rivers or sea areas, and seriously endanger human health and the growth of animals and plants. [0003] Generally speaking, the current detoxification methods for chromium slag (that is, changing highly toxic hexavalent chromium into trivalent chromium) are divided into two categories: wet detoxificat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/00C02F11/10B09B3/00B09B5/00
CPCB09B3/00B09B5/00C02F11/10C10B53/00
Inventor 张大磊李卫华方思源
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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