Tower top dust recovery device for urea granulation tower and recovery method for dust on top of urea granulation tower

Abstract

The invention discloses a tower top dust recovery device for a urea granulation tower. The tower top dust recovery device comprises a granulation tower body and a receiving disc arranged in the tower body, wherein a cylindrical dust recovery chamber is arranged on the top of the tower body; the diameter of the dust recovery chamber is greater that of a tower top vent hole; sprinklers are arranged at upper and lower ends of the dust recovery chamber, and a filling dust suction device formed by an inclined partition plate is arranged between the sprinklers at two ends; a feed pipe connected to the bottom end of the receiving disc is connected with a filter; a discharge hole of the filter is connected with a circulating pump by a material control valve, and an outlet of the circulating pump is connected with the sprinklers at upper and lower ends in the dust recovery chamber by a pipeline; a branch pipe which opens into an evaporator is connected between the filter and the material control valve; and a water replenishing branch pipe is arranged between the material control valve and the circulating pump. Due to the adoption of a tail gas filter washing absorption device for the urea granulation tower, environment is protected; and more importantly, effective value is recovered, the waste of resources is reduced, and the investment in the device can be recovered quickly.

Description

technical field [0001] The invention relates to a dust recovery device and method, in particular to a dust recovery device and a recovery method at the top of a urea granulation tower. Background technique [0002] At present, in most chemical fertilizer production enterprises, the tail gas of urea prilling tower usually contains non-negligible urea dust and ammonia gas. There are urea dust, ammonia and water-soluble condensates that are easily soluble in water. Especially now, Most manufacturers expand the production scale while the original prilling tower remains unchanged. Some manufacturers transform 40,000 tons / year of urea into 200,000 tons / year of urea. The amount of dust and other harmful substances discharged from the prilling tower continues to increase with the expansion of production. The concentration of dust in the tail gas is generally 300-700㎎ ∕Nm 3 , the environmental pollution is becoming more and more serious; under normal circumstances, a prilling tower...

AI Technical Summary

Problems solved by technology

Some manufacturers transform 40,000 tons / year of urea into 200,000 tons / year of urea. The amount of dust and other harmful substances discharged from the prilling tower continues to increase with the expansion of production. The concentration of dust in the tail gas is generally 300-700㎎ ∕Nm 3 , the environmental pollution is becoming more and more serious; under normal circumstances, an annual output of 200,000 tons of prilling tower can pollute the environment within a radius of 6Km, forming a highly corrosive atmospheric environment

Some existing chemical fertilizer production enterprises often use water sprinkling to remove dust on the top of the tower, but because the dusty gas usually has a relatively high temperature, the heat in the gas evaporates the water vapor during the dust removal process, and at the same time evaporates a large amount of urea solution. Lead to low dust removal efficiency, low energy utilization rate, and pollution to the surrounding environment

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