An energy-saving and environmentally friendly production system for solid polyaluminum chloride using heat-conducting oil-type drum drying

Abstract

The invention discloses an energy-saving and environment-friendly production system of solid polyaluminium chloride by drying with a conduction oil type drum. The system comprises a one-step reaction system, a two-step reaction system, a drying system and a boiler system; the one-step reaction system comprises a reaction tank, a reaction tank transfer pool, a flocculant preparation tank I, a main filter press and a one-step liquid pool, the two-step reaction system comprises a conditioning tank, a conditioning tank transfer pool, a cooling tower, a separation pool, a separation residue storage pool, a flocculant preparation tank II and a semi-finished product pool, the drying system comprises a drying liquid high level tank, a drum drying device and a finished product belt conveyor, and the boiler system comprises a conduction oil boiler, an afterheat boiler, a desulphurization and dust removal device and a high chimney. The energy-saving and environment-friendly production system disclosed by the invention is used for effectively controlling and reducing the content of insoluble substance in reaction liquid, improving the yield and quality of a final solid polyaluminium chloride product, and saving energy and reducing consumption in the production of the solid polyaluminium chloride.

Description

technical field [0001] The invention belongs to the technical field of polyaluminum chloride production, and relates to an energy-saving and environment-friendly production system of solid polyaluminum chloride that uses heat-conducting oil type drum drying. Background technique [0002] Polyaluminum chloride, commonly known as water purifying agent, also known as polyaluminum chloride, referred to as polyaluminum, English name PAC; it is a cationic inorganic polymer flocculant of polyhydroxyl and multinuclear complexes, and the appearance of solid products is red Brown, yellow or white solid powder, its chemical formula is [AL 2 (OH) n CL 6-n ] m (In the formula, 1≤n≤5, m≤10), where m represents the degree of polymerization, n represents the degree of neutrality of the PAC product, is easily soluble in water, has strong bridging adsorption, and is accompanied by electrolysis during the hydrolysis process. Physical and chemical changes such as chemistry, coagulation, ads...

AI Technical Summary

Problems solved by technology

[0007] 1) In the first step of acid dissolution reaction and the second step of polymerization reaction, a large amount of insoluble matter will be produced, which is difficult to separate from the reaction solution, resulting in a serious excess of insoluble matter in the final solid polyaluminum chloride product;

[0008] 2) The heat exchange efficiency of the drum drying device used is not high, the heating is uneven, and the heat energy of the heat transfer oil cannot be effectively used, which is not conducive to energy saving and emission reduction;

[0009] 3) The flow setting of the drying system is not reasonable enough, resulting in high drying energy consumption costs, and the handling of solid polyaluminum chloride after drum drying is also time-consuming and laborious;

[0010] 4) The production of polyaluminum chloride not only requires heat energy for drying, but also equipment such as reaction pools and tempering pools. However, the utilization rate of heat energy for existing polyaluminum chloride production equipment is not high, and there is a lot of room for energy saving. There is also no effective treatment of the coal-fired flue gas produced, especially the dust content does not meet the emission standards

Images