Industrial waste salt system and method

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to an industrial waste salt system and method. The industrial waste salt system comprises a waste salt pretreatment unit, a waste salt thermal analysis device, a high temperature dust removal unit, an oil and gas condensing unit, a gas purification unit, a liquid purification and recovery unit, a burner, an evaporation and crystallization unit, and a salt slag waste heat recovery unit. The industrial waste salt system and method is complete in harmless treatment, high in resource recovery rate, and low in treatment energy consumption, and the recovery rate of the waste salt after the treatment of the system can reach 80%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an industrial waste salt system and method. Background technique [0002] Industrial waste salt refers to various waste residues, dust and other wastes discharged during industrial production. In the industrial field, many enterprises produce waste salt in the production process. For example, in the production process of organic and inorganic chemical products, a large amount of salty wastewater is produced, which forms solid crystals after evaporation and concentration. The crystalline salt contains a large amount of organic or inorganic impurities; waste salt, a by-product of pesticides, is the largest amount in the pesticide industry. Solid waste contains various toxic and harmful substances with complex components. At the same time, due to the high moisture content, it is easy to agglomerate, and it is difficult to be effectively treated and uti...

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Problems solved by technology

However, the energy efficiency of this treatment process is low. Taking the high-temperature cracking rotary heating furnace process as an example, since the combustion adopts the direct ignition combustion method, the high-temperature tail gas temperature reaches 300°C-500°C, and the combustion efficiency is less than 70% when it is directly discharged outside.

In addition, due to the limited contact time between waste salt and hot air in the indirect heat exchange process, the temperature of the salt itself has not reached the desired temperature, and the content of residual organic components is difficult to control, which requires high temperature control; the heat generated by the pyrolysis of organic matter in the direct heat exchange process The pyrolysis gas is mixed with a large amount of flue gas, which makes it difficult to recycle the pyrolysis gas and can only be discharged together with the flue gas, which fails to achieve the purpose of resource recovery and causes secondary pollution

At the same time, the existing rotary heating furnace, multi-layer disc cracking furnace, etc. cannot solve the problem of ringing and agglomeration of waste salt at high temperature

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