Device and method for recycling steam waste heat in alum production

Abstract

The invention discloses a device for recycling steam residual heat in production of alums. The device comprises a boiler, a reaction kettle, an evaporation condensation tank, a cooling crystallizing tank, a first steam collector, a second steam collector, a heat transmitting pipe, a residual heat pipe and a titanium heating pipe, wherein the first steam collector is arranged above the evaporation condensation tank; the second steam collector is arranged above the cooling crystallizing tank; the steam outlet of the reaction kettle, the steam outlet of the first steam collector and the steam outlet of the second steam collector are communicated with the gas inlet of the boiler by the residual heat pipe; the titanium heating pipe is arranged in the evaporation condensation tank and the steam outlet of the boiler is communicated with the titanium heating pipe by the heat transmitting pipe. Meanwhile, the invention provides a method for recycling the steam residual heat, which is applicable to the device. By the aid of the device and the method, a lot of high-temperature tail gas residual heat generated in all procedures in an alums production process can be recycled, so that the emission amount of tail gas is greatly reduced, the environment pollution is reduced and the production cost is also saved.

Description

technical field [0001] The invention relates to a device and method for recovering and utilizing steam waste heat in alum production, and belongs to the technical field of chemical industry. Background technique [0002] Alum generally includes ammonium alum (NH 4 Al(SO 4 ) 2 12H 2 O), potassium alum (kAl(SO 4 ) 2 12H 2 O) and sodium alum (NaAl(SO 4 ) 2 12H 2 O). Ammonium alum is mainly used as a buffering agent and leavening agent for food-grade products, a coagulant for sewage purification, an aluminum tanning agent in the leather industry and a post-treatment agent for skin tanning, an anti-dyeing agent in the dye industry, and paper sizing in the paper industry. Dyeing agent, colorant for yellow glass in the glass industry, medical sword collecting agent, printing and dyeing mordant, and can also be used in industrial fields such as pigments, electroplating, and starch. The current main production method of this product is to treat bauxite with sulfuric acid t...

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Problems solved by technology

If the steam waste heat in the above three processes is not recycled, it will not only cause a great waste of energy, but also increase the production cost, and it does not meet the national policy requirements for energy conservation and emission reduction

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