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Method for preparing gas energy by utilizing chlorine-containing plastic and carrying out harmless treatment on chromium slag at same time

A technology of energy gas and chromium slag, which is applied in the direction of chloride preparation, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of long reaction cycle, HCl is not easy to volatilize, and Cl pollution, so as to achieve harmlessness and avoid Effect of air pressure control and energy saving

Active Publication Date: 2016-06-01
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

Although this method is more practical, due to the implementation of the two-step method, the reaction cycle is long
In addition, during engineering implementation, HCl is not easy to completely volatilize, and some residual Cl is easy to enter the second step of cracking oil and gas to contaminate it

Method used

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  • Method for preparing gas energy by utilizing chlorine-containing plastic and carrying out harmless treatment on chromium slag at same time

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example 2

[0028] 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;

[0029] 2. The chlorine-containing plastics are pyrolyzed in a pyrolysis reactor at 250-350°C, and the HCl produced by the pyrolysis enters the washing tower and is discharged. The solid-phase coking products produced by the cracking are then sent to the head of the rotary electric furnace and mixed with high-temperature steam and chromium slag. During this process, the plastic coking products are further cracked to generate cracking gas; the mixed gas of high-temperature steam and plastic cracking gas is rotating The electric f...

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Abstract

The invention relates to a method for preparing gas energy by utilizing chlorine-containing plastic and carrying out harmless treatment on chromium slag at the same time. The method provided by the invention comprises the following steps: carrying out reaction on the chlorine-containing plastic at the low temperature of 250-350 DEG C, so as to remove HCl in the chlorine-containing plastic; then carrying out high temperature catalytic cracking on the plastic with HCl removed by utilizing dangerous waste chromium slag; and relatively thoroughly transforming the plastic into low molecular gas energy under steam gasification condition, so that coking is avoided, and an energy product is more efficient; besides, the produced gas energy transforms hexavalent chromium in the chromium slag into trivalent chromium, so that harmless treatment on the chromium slag is realized.

Description

technical field [0001] The invention relates to a method for preparing energy gas by utilizing chlorine-containing plastics and harmless chromium slag at the same time. Through steam gasification and chromium slag catalysis, the chlorine-containing plastics are cracked and converted into small-molecule energy gas. At the same time, the generated energy gas can efficiently reduce the hexavalent chromium in the chromium slag, and the chromium slag can absorb the generated HCl. 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 tox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/07C10B49/16C01B7/03B09B3/00B09B5/00
CPCC10B49/16C10B53/07C01B7/035B09B5/00B09B3/45Y02P20/143
Inventor 张大磊方思源叶春
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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