Phosphoric acid production device by employing hot method

Abstract

The invention discloses a phosphoric acid production device by employing a hot method, and belongs to the technical field of energy-saving technologies of phosphoric acid production by employing a hot method. The device comprises a combustion tower, an absorption tower, a dynamic wave demister, a gas-liquid separator and an induced draft fan, wherein the combustion tower is communicated with the inlet in the top of the absorption tower; the absorption tower is connected with the dynamic wave demister; the dynamic wave demister is communicated with the induced draft fan through the gas-liquid separator; meanwhile, the absorption tower is connected with a heat exchanger through an absorption tower circulating pump; the heat exchanger is communicated with the absorption tower to form a loop through a pipeline; and the dynamic wave demister and a demister circulating pump form a loop through a pipeline. According to the device, the resistance of the system is reduced, the dosage of circulating acid and circulating water is lowered, the installed capacity of the system is greatly lowered, energy conservation and consumption reduction are achieved, the production capacity of the system is improved, and the device has the characteristics of low investment cost, small floor area, low power consumption, low production cost, and low coal resource and water resource consumption.

Description

technical field [0001] The invention relates to a thermal phosphoric acid production device, which belongs to the technical field of thermal phosphoric acid production and energy saving. Background technique [0002] The production process of thermal phosphoric acid is mainly composed of yellow phosphorus combustion (using elemental phosphorus to prepare phosphorus pentoxide), hydration (phosphorus pentoxide is absorbed by dilute phosphoric acid to form high-concentration phosphoric acid), tail gas treatment (absorbed by water or dilute phosphoric acid and discharged after reaching the standard ) consists of three parts, and its basic technological process is as follows: solid yellow phosphorus is melted into liquid yellow phosphorus by heating medium (such as steam, hot water, hot gas), and the liquid yellow phosphorus is transported to the combustion tower for atomization and mixed with air (or rich Oxygen, air, or oxygen) is burned to generate bimolecular phosphorus pento...

AI Technical Summary

Problems solved by technology

This production process has the disadvantages of large system resistance, low absorption efficiency, large amount of circulating acid, and large volume of hydration tower equipment, especially the large resistance of the Venturi demister and the large amount of circulating acid in the empty tower, resulting in the circulation pump and induced draft fan motor The power configuration increases, and the energy consumption of the entire process technology system is high, resulting in energy waste

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