Waste salt recycling system and method based on thermal power plant energy saving and environment protection integration

Abstract

The invention relates to a waste salt recycling system and method based on thermal power plant energy saving and environment protection integration. The system comprises a dryer A, a dust removal deacidification device B, a vacuum device C, a liquid-liquid heat exchanger D, a solid-liquid heat exchanger E, a high-temperature pyrolyzer F, a negative-pressure draught fan G, a dust removal deacidification device H, a dissolving pond K, a coagulative precipitation tank J, a filter press I, a seed crystal precipitation device O, an adjusting pond S, an oxidizer T, an adjusting pond U, a freezing crystallization device R, a re-dissolution pond N, an evaporation crystallizer M, a steam ejector X, an evaporation crystallizer Q, a resolver L, an adsorption device P, a freezing device V, an evaporation crystallizer W and an induced draft fan Z. Harmful and recycling treatment of danger waste salt generated during industrial production can be achieved on the basis of energy gradient utilization and waste heat recycling thermotechnical processes, accompanying dioxin, danger waste smoke and other secondary pollution are eliminated, and the danger waste salt recycling treatment effective runningenergy consumption and danger waste salt treatment cost are obviously reduced.

Description

technical field [0001] The present invention relates to a waste salt recycling system and method based on the integration of energy conservation and environmental protection of thermal power plants, and in particular to a method for co-processing high-salt hazardous wastes by using waste heat resources of thermal power plants. Background technique [0002] Industrial waste salt comes from pesticides, dyes, pharmaceutical chemicals, coal chemicals, iron and steel, metallurgy, refining, coking and other industries. One is a by-product of industrial processes, and the other is a crystallization product derived from zero discharge of sewage. my country's industrial by-products every year The amount of hazardous salt waste exceeds 10 million tons, most of which have not been properly treated, which is extremely harmful to the environment. With the strengthening of high-salt wastewater treatment in my country, the production of industrial waste salt also increases The harmless and r...

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Problems solved by technology

[0003] The mainstream technical route of resource disposal of industrial waste salt in China is mainly to realize carbonization and oxidation of organic matter in waste salt by means of "thermal incineration, or even high-temperature melting of waste salt, to remove organic matter in waste salt, and then rely on chemical method to purify Multivalent cations and membrane method salt separation process, combined with evaporation method for crystallization and purification” are the main technical routes. The thermal incineration fuel is currently mainly natural gas. The current overall technical route has the problems of high operating costs, large investment, and resources. Incomplete purification and secondary environmental pollution, especially for the tail gas treatment of burning industrial waste salt, there is no industry unified standard and detection means, the monitoring and treatment of dioxin in the tail gas, component analysis, lack of effective technical means , the generation mechanism, production amount and components of dioxin are not clear, and it is difficult to ensure the treatment effect by simply applying the conventional flue gas purification treatment process, which will cause air pollution; Blockage, corrosion of heat exchange pipelines, high equipment replacement rate, and some ultra-fine crystallized salt particles escaping into the atmosphere in the form of aerosols have virtually aggravated the formation factors of smog. At the same time, excessive energy consumption, As a result, the cost of disposal remains high. In addition, there are still about 8% of hazardous waste residues that need to be solidified and landfilled after waste salt resource disposal. The expensive landfill disposal costs have overwhelmed the enterprises that produce waste salt; characteristics, resulting in waste salt not suitable for landfill, high requirements for landfill and expensive

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