Thermal phosphoric acid waste heat utilization device with steam superheater

Abstract

The invention provides a hot process phosphoric acid waste heat utilization apparatus provided with a steam superheater. The apparatus comprises a steam drum, a phosphoric acid combustion furnace and the steam superheater, the phosphoric acid combustion furnace comprises a radiation heat exchange evaporator, the upper end of the radiation heat exchange evaporator is connected with the steam drum through steam guiding tubes, the lower end of the radiation heat exchange evaporator is connected with the steam drum through a downcomer, the steam superheater comprises coils, a steam distribution semi-annular tube and a steam collection semi-annular tube, the inlets of the coils are connected with the steam distribution semi-annular tube, the outlets of the oils are connected with the steam collection semi-annular tube, the steam distribution semi-annular tube is connected with the steam outlet tube of the steam drum through a steam introduction tube, and the steam distribution semi-annular tube is connected with a superheated steam output tube through a superheated steam guiding tube to lead out superheated steam. The hot process phosphoric acid waste heat utilization apparatus provided with a steam superheater heats saturated steam discharged by the steam drum through adopting the steam superheater to form superheated steam with a certain temperature and outputs the obtained superheated steam with a certain temperature, so the waste heat recovery efficiency and the energy comprehensive utilization efficiency are improved, and the outlet temperature of the phosphoric acid combustion furnace is reduced, thereby the apparatus has good social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a thermal phosphoric acid waste heat utilization device with a steam superheater. Background technique [0002] Phosphoric acid is an important chemical raw material and intermediate, which can be used to manufacture phosphate fertilizers and various phosphates. Thermal phosphoric acid can obtain phosphoric acid with high concentration and high purity. The purified high-purity phosphoric acid can be used in national defense, aerospace, food, Medicine, electronics and other industries. [0003] There are two types of phosphoric acid production: thermal method and wet method. The wet method uses the principle of strong acid to decompose weak salt, and is mainly used for the production of phosphate fertilizer. Thermal production first smelts phosphate rock in an electric furnace or a blast furnace to obtain elemental phosphorus, and then burns elemental phosphorus and ai...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the problem that the phosphorus combustion tower can only produce low-pressure saturated steam in the prior art, a thermal phosphoric acid waste heat utilization device with a steam superheater is provided, which utilizes the addition of steam in the phosphorus combustion tower The superheater is the superheated steam that heats the saturated steam discharged from the steam drum to a certain temperature, and can also reduce the outlet temperature of the process gas from the phosphorus combustion tower to further improve the comprehensive utilization efficiency of energy

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