Method for recycling Fischer-Tropsch synthetic oil waste water
A technology for Fischer-Tropsch synthetic oil and synthetic oil, which is applied in the field of coal chemical industry, can solve problems such as inability to treat synthetic oil wastewater, and achieve the effects of saving production water and reducing water consumption
Inactive Publication Date: 2016-12-07
INNER MONGOLIA YITAI CTO
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Problems solved by technology
[0003] In order to solve the above-mentioned problems existing in the prior art, the present invention solves the problem that the synthetic oil wastewater cannot be treated by using synthetic oil wastewater to configure coal water slurry additives through a large number of studies, achieves the purpose of saving water, and indirectly creates a great economy benefit
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[0016] First, the gasified 40% additive mother liquor (the main component is sodium lignosulfonate) is sent from the additive underground tank to the additive tank, and then the synthetic water in the intermediate tank area is pumped to the additive tank to dilute the additive mother liquor to 5 % (mass fraction), the additive is pumped to the coal mill through the additive, and 5% of the additive and coal are mixed at a ratio of 1:23 (mass ratio) to produce coal-water slurry. According to the current working conditions, about 15 tons of additive mother liquor is consumed every day, and 135 tons of synthetic oil wastewater is required according to its proportion, which greatly reduces the processing burden of synthetic oil wastewater.
[0017] The pH value of the synthetic oil wastewater produced by the F-T synthesis process is around 3-4, which is very acidic. In order to avoid corrosion of the pulping system and coal slurry pipeline, in the pulping water tank originally used...
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Abstract
The invention relates to a method for recycling Fischer-Tropsch synthetic oil waste water. The method comprises the steps of introducing and storing synthetic oil waste water with the pH of about 3-4 generated through an F-T synthetic process into a pulping water tank, adopting ammonia-containing waste water with a high concentration from an ammonia distillation stripping tower condenser at a Fischer-Tropsch synthetic process purification section to perform neutralization with the synthetic oil waste water, so that the pH of the synthetic oil waste water rises to 7-7.5; storing coal water slurry additive mother liquor with a concentration of 40% in an additive underground tank; after the concentration of the coal water slurry additive mother liquor is diluted to 4% with the synthetic oil waste water obtained through the step 1) in the additive tank, pumping the solution into a mill through an additive pump, and preparing coal water slurry, so that the synthetic oil waste water is recycled. According to the method, the great problem that the synthetic oil waste water is difficult to treat is solved, the synthetic oil waste water is utilized to be matched with a coal water slurry additive, so that plenty of water for production is saved, and a great contribution is made for reducing coal oil process water consumption.
Description
technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a recycling method of Fischer-Tropsch synthetic oil wastewater. Background technique [0002] A large amount of synthetic oil wastewater generated by the Fischer-Tropsch synthesis reaction is rich in organic compounds such as alcohols, aldehydes, acids, ketones, and esters. Its COD is as high as 10,000 ppm or more. It is difficult to effectively treat ordinary wastewater biochemical processes, which seriously affects the safety and stability of the plant. . Synthetic oil wastewater treatment has always been one of the difficulties solved by coal-to-liquids technology, and Yitai's 160,000-ton indirect coal liquefaction plant is the first indirect coal-to-liquids plant with independent intellectual property rights in China, and there is no experience to learn from. Contents of the invention [0003] In order to solve the above-mentioned problems existing in the ...
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IPC IPC(8): C10L1/32C10L1/24
CPCC10L1/32C10L1/24
Inventor 毕冬冬田力孙波燕磊
Owner INNER MONGOLIA YITAI CTO