Method and device capable of simultaneously providing various clean heat sources to prepare polyaluminum chloride

Abstract

The invention discloses a method and a device capable of simultaneously providing various clean heat sources to prepare a polyaluminum chloride. The method includes preparing clean high temperature hot wind, performing heat supply by a conduction oil heat exchanger, performing heat supply by a vapor generator, performing heat supply by a spray dryer, performing hot wind purification by the spray dryer and performing tail gas treatment. The method and the device capable of simultaneously providing various clean heat sources to prepare the polyaluminum chloride have the advantages that heat supply systems are centralized, the heat supply efficiency is high, and polyaluminum chloride product production is low in energy consumption, small in pollution and low in operating cost.

Description

technical field [0001] The invention relates to a method for simultaneously providing multiple clean heat sources for preparing polyaluminum chloride, and also relates to a device for realizing the method for simultaneously providing multiple clean heat sources for preparing polyaluminum chloride. Background technique [0002] Polyaluminum chloride is an excellent water purifying agent product, and the market demand is increasing year by year. my country is a major producer of polyaluminum chloride products, and the output in 2011 has exceeded 1.5 million tons. However, the polyaluminum chloride industry is a market with sufficient market competition. industry, the production threshold is low, there are hundreds of production enterprises in the industry, most of the production scale is around 10,000-20,000 tons / year, and there are few large enterprises. [0003] The production of polyaluminum chloride mainly uses bauxite, calcium aluminate, aluminum hydroxide, sodium aluminat...

AI Technical Summary

Problems solved by technology

In the production of heat transfer oil drum dryer, due to the high temperature of the drying heat source, it can dry liquid polyaluminum chloride products with a basicity higher than 88%. The liquid aluminum oxide content of this type of product can reach about 12%. Therefore, the production energy consumption is relatively high. Low, the coal consumption per ton of product is only 300kg. In addition, because the basicity of the liquid product is reduced to 88%, part of the bauxite can be replaced by aluminum hydroxide raw materials in the production process, and the amount of calcium aluminate is also reduced, so the heavy metal content in the product Compared with the product produced by the steam drum dryer; the disadvantage of this technology is that the hot air of the heat conduction oil furnace needs to add a dust removal and desulfurization system, and the heat brought by the hot air cannot be fully utilized; the production of the spray dryer has a high technical content and equipment investment. It is nearly ten times that of the drum dryer, so there are not many enterprises using this method to dry, and this part of the product accounts for about 30% of the national output.

The shortcoming of this technology is that the system does not generate steam, and the production section of liquid polyaluminum chloride needs to increase the heat supply of steam boilers, and it is difficult for small steam boilers to pass the environmental assessment

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