System and method for treating industrial waste salt by fluidized bed

Abstract

The invention relates to a system and a method for treating industrial waste salt by a fluidized bed, and belongs to an industrial waste salt treatment technology. The system involves a waste salt low-temperature drying unit, a crushing, screening and feeding unit, a fluidized bed medium-temperature steam stripping and oxidation treatment unit and a flue gas emission unit. The method comprises thesteps that the waste salt is dried through a roller dryer and then is crushed into the waste salt particles with proper particle size through a crushing and screening machine; the waste salt particles enter a fluidized bed suspension layer, through steam, combustion-supporting gas and air fluidizing, the waste salt particles turbulently flow and are mixed, and the waste salt particles stay for acertain period of time and then are discharged; and VOC organic matters generated through steam stripping and VOC tail gas generated through drying enter a secondary combustion chamber to be sufficiently combusted, and finally are cooled, purified and discharged. According to the system and the method, the industrial waste salt can be continuously treated on a large scale, the working efficiency is high, and the cost of an enterprise can be greatly saved.

Description

technical field [0001] The invention relates to an industrial waste salt treatment technology, in particular to a fluidized bed treatment system and method for industrial waste salt. Background technique [0002] Industrial waste salt comes from industrial high-salt wastewater (salinity above 2g / L). Pesticides, dyes, pharmaceutical intermediates and other fine chemical industries all produce a large amount of industrial salty wastewater containing complex organic matter TOC, which is difficult to treat, causing serious damage to the ecological environment. huge stress. my country's saline wastewater accounts for more than 5% of the total wastewater output, with a total volume of more than 300 million cubic meters per year, and is still growing at a certain rate. [0003] At present, the relatively mature technologies for treating high-concentration saline organic wastewater include dilution biochemical method, evaporation concentration method, incineration method, membrane ...

AI Technical Summary

Problems solved by technology

However, this method still has the following problems: (1) The operating temperature of the first-stage anaerobic carbonization furnace is 490-510 ° C and has exceeded the carbonization temperature of organic matter, which will cause coking and carbonization of organic matter in the inner pores or surfaces of waste salt; (2) Superheated steam of 700-800°C introduced into the first-grade anaerobic carbonization furnace has far exceeded the carbonization temperature of organic matter; (3) The material mixing and heating of the rake carbonization furnace is uneven, and the filling rate is limited, so it is difficult to scale up and operate in large quantities

This technical solution has the following problems: (1) The temperature of the primary gas stripping is 400-800 ° C, which has exceeded the carbonization temperature of the organic matter attached to the waste salt, which will cause coking and carbonization of the organic matter, which is more difficult to handle; (2) The hot flue gas is used as the gas stripping The medium cannot inhibit the carbonization of organic matter, so it is not a suitable stripping medium; (3) The flue gas pipeline is used as the stripping equipment, and the flue gas stripping time is only 2-5s, which affects the stripping effect

[0012] In summary, at present there is no effective method that can continuously treat industrial waste salt containing toxic and harmful organic matter TOC in large quantities. Salt Technical Solutions

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