Clean treatment method of compound fertilizer granulation tail gas

Abstract

The invention relates to a clean treatment method of compound fertilizer granulation tail gas, belonging to recycling of industrial waste gas carrying materials. The method utilizes a dust recovery unit and a water washing treatment unit, wherein the water washing treatment unit comprises a treatment process of vacuum water washing, sealed flow deflection settling, and ammonia gas salification and fixation. The treatment process comprises the following steps: (1) vacuum water absorption; (2) sealed flow deflection settling; (3) ammonia gas salification and fixation; and (4) pressure filtration. The clean treatment method of compound fertilizer granulation tail gas does not need any acidification or neutralization section, and has the advantages of short period for solid-liquid settlement separation and favorable separating effect; in the solid-liquid separation process and use process, little ammonia gas escapes; and the method is beneficial to resource saving and environment protection. The invention is suitable for recycling tail gas generated by a compound fertilizer or complex fertilizer granulation device.

Description

technical field [0001] The invention relates to a cleaning treatment method for compound fertilizer granulation tail gas, which belongs to the recycling and utilization of materials carried by industrial waste gas. Background technique [0002] In the production of compound fertilizers, during the production process of granulation, hot air drying, cooling, screening, heating, cooling, etc., the products of physical and chemical changes such as material dust and volatile components will inevitably be produced. Exhaust system entrained with drying and cooling airflow. For a long time, these dusts and their volatile components have directly entered the atmosphere with the exhaust airflow, causing waste of resources and environmental pollution. [0003] In the prior art, after cyclone separation and dedusting, the method of circulating water washing can be used to return the solid dust separated by cyclone dedusting to the raw material process for production raw materials. How...

AI Technical Summary

Problems solved by technology

[0006] 1. Natural sedimentation has the problems of long solid-liquid separation period and poor solid-liquid separation effect. During the natural sedimentation separation process, the escaped ammonia gas is discharged into the atmosphere, polluting the atmospheric environment

[0007] 2. Centrifugal dehydration has cumbersome process, high labor intensity, and high energy consumption. During the dehydration and filtration process, the escaped ammonia gas is discharged into the atmosphere, polluting the atmospheric environment

[0008] 3. The ammonia gas dissolved in the washing water is easy to escape, and there are still problems of polluting the air environment of the workshop and wasting resources

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