Coal chemical industry wastewater and waste gas co-treatment system and method

Abstract

The invention discloses coal chemical industry wastewater and waste gas synergistic treatment system and method, wherein the method comprises the steps: firstly carrying out the pretreatment of coal chemical industry wastewater, and enabling the sulfide content in the wastewater to be less than 20 mg / l and the ammonia content to be less than 100 mg / l; then quenching the pretreated coal chemical industry wastewater; then, waste gas generated after coke quenching is pretreated, and wastewater generated after waste gas pretreatment is fed into coal chemical industry wastewater for pretreatment; and finally, the pretreated waste gas is subjected to heat storage oxidation incineration. According to the scheme, after the coal chemical industry wastewater is pretreated and quenched, volatile organic compounds are purified through oxidative incineration, and closed-cycle cooperative treatment is carried out on the coal chemical industry wastewater and waste gas, so that zero emission of the wastewater and ultra-clean emission of the waste gas are achieved.

Description

Technical field [0001] The invention relates to coal chemical industry technology, in particular to waste water and waste gas treatment technology in coal chemical industry. Background technique [0002] The world’s economic and political situation is becoming more and more complex, China-US relations are being repositioned, and China’s energy security is facing profound changes, which will affect the development of China’s coal industry chain and coal chemical industry. With economic development, people’s energy consumption is still increasing. Coal chemical industry is the strategic backup of energy. Clean and efficient use of coal is the focus of China's energy development in the future. Therefore, it is very important to solve the environmental protection problem of clean and efficient use of coal. It is related to the long-term sustainable development of coal chemical industry and China. Energy security. [0003] In the clean and efficient use of coal, coal chemical productio...

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Problems solved by technology

Among them, the deacidification and phenol ammonia recovery used in the pretreatment, due to the complex composition of phenol, the conditions of phenol ammonia recovery are difficult to control. In fact, it is a chemical unit. The industrial salt is not pure enough and still needs to be disposed of. In short, the current coal chemical wastewater treatment process is long, complex, difficult to operate, high in investment and operating costs, and the industrial salt produced cannot be disposed of.

[0005] After the existing coal chemical waste gas treatment is collected, due to the low emission standard, the technical equipment of spraying and activated carbon adsorption is generally used for adsorption to meet the secondary emission standard of air pollutants, and the treatment efficiency is relatively low

Due to the many sources of waste gas and the complexity of the waste gas, some exhaust points have not treated the waste gas, such as coke quenching waste gas, semi-coke transportation and other links, resulting in a poor coal chemical industry environment and the presence of peculiar smells, causing physical harm to employees. The environmental impact is also very important, and it is still possible that VOCS exceeds the standard

[0006] In addition to the above-mentioned problems in the existing schemes for wastewater treatment and waste gas treatment in the coal chemical industry, in the actual production process, wastewater and waste gas are treated independently, and coordinated treatment cannot be achieved

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