Movable air stirring system for preventing and clearing away sediment of phosphoric acid slag in tank

Abstract

The invention discloses a movable air stirring system for preventing and clearing away sediment of phosphoric acid slag in a tank. A horizontal inhaul cable is arranged at the top end of a tank wall along the diameter direction; a movable pulley block is arranged on the horizontal inhaul cable; a purging nozzle connected with compressed air is suspended inside a tank body by the pulley block and the inhaul cable in the vertical direction to realize purging; and the purging nozzle can freely move inside the tank body by adjusting the circumference position of the horizontal inhaul cable, the horizontal position of the pulley block and the position of the purging nozzle in the vertical direction. The movable air stirring system conveys the compressed air from an air compressor to the purging nozzle arranged in the tank by a pipeline, can make the purging nozzle freely move in the longitudinal, horizontal and up-down directions to realize the function of stirring the phosphoric acid slaginside the phosphoric acid tank, can effectively clear away the sediment of the phosphoric acid slag in the phosphoric acid tank and prevent the generation thereof and can avoid huge economic loss ofthe enterprise due to the sediment generated in the phosphoric acid tank and avoid influencing normal operation of the enterprise due to long-term production suspension cleaning.

Description

technical field [0001] The invention relates to a device for cleaning and preventing sediment inside a large liquid storage tank, in particular to a movable air stirring system for preventing and cleaning the sedimentation of phosphoric acid slag in the tank. Background technique [0002] Among the domestic chemical production enterprises, all enterprises that use phosphoric acid tanks to store phosphoric acid have the same problem, and it is also a difficult problem that has not been solved in the production process, that is, the phosphoric acid slag precipitates in the phosphoric acid tank. When it accumulates to a certain height, it will affect the normal use of the storage tank. Phosphoric acid precipitation will block the circulation system of the tank, block the inlet pipeline of the acid pump, and reduce the acid storage capacity of the tank. [0003] Phosphoric acid slag is composed of phosphoric acid and iron-aluminum compounds of phosphoric acid. If no precipitatio...

AI Technical Summary

Problems solved by technology

Due to the strong corrosiveness of phosphoric acid and the large size of the tank body, the current treatment method for the sediment inside the phosphoric acid tank is to stop the use of the storage tank and clean it manually.

If the sediment is high, landslides will often occur during cleaning, causing casualties. If there is a mixed state of phosphoric acid and sediment, it is more likely to cause casualties and various accidents of sediment leakage, and it will also cause serious environmental pollution during cleaning.

Under normal circumstances, the cost of cleaning a phosphoric acid tank: more than 600,000 yuan for labor, more than 500,000 yuan for materials and machinery, more than 600,000 yuan for tank body repair (repair of rubber lining, etc.), more than 200,000 yuan for replacement of valve spare parts In addition, taking a phosphoric acid tank with a diameter of 28 meters as an example, if the phosphoric acid precipitation is 6 meters high, the precipitated phosphoric acid slag will reach about 6,000 tons, assuming 4,500 tons of phosphoric acid per ton Yuan, then the cleaning of phosphoric acid slag will directly cause an economic loss of about 27 million yuan, and the cleaned phosphoric acid slag is difficult to deal with, and in some areas it will cost treatment fees; it usually takes 3-4 months from the beginning of cleaning to the end of tank repair. months, it can be seen that the economic loss caused by phosphoric acid precipitation is huge

Images