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Method for recycling tail gas generated by granulation of compound fertilizer

A compound fertilizer and tail gas technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as polluting the environment and wasting resources, and achieve the effects of saving energy, reducing production costs, and highlighting substantive features

Inactive Publication Date: 2010-04-28
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problems of wasting resources and polluting the environment

Method used

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  • Method for recycling tail gas generated by granulation of compound fertilizer
  • Method for recycling tail gas generated by granulation of compound fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1 The recycling method of compound fertilizer granulation tail gas of the present invention

[0031] It includes dust recovery and tail gas water washing, and is characterized in that all washing liquids are recycled and utilized. Including the following process steps:

[0032] a. Acidification

[0033] Add an aqueous mineral acid solution to the circulating water washing solution to make the pH of the washing solution ≤ 6.5;

[0034] b. Vacuum absorption

[0035] The circulating washing liquid in the circulation tank (1) enters the top of the absorption tower (2) through the circulation pump (4), and the exhaust gas (10) after dust removal flows through the tower from bottom to top under the vacuum condition generated by the jet pump (7). The plate (3) is in countercurrent contact with the circulating washing liquid to absorb fine fertilizer dust and decompose NH3 gas.

[0036] c. Solid-liquid separation

[0037] When the circulating washing liquid is a...

Embodiment 2

[0041] According to the method and step of embodiment 1, wherein in step a, add H 2 SO 4 Aqueous solution, the pH of the washing liquid is between 5-6, and the vacuum degree of vacuum absorption described in step b is controlled between -0.01~-0.06Mpa.

Embodiment 3

[0043] According to the method and step of embodiment 1, wherein in step a, add H 3 PO 4 Aqueous solution, make the pH of washing solution between 5-6, the vacuum absorption vacuum degree described in step b is controlled at-0.03Mpa.

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Abstract

The invention relates to a method for recycling tail gas generated by the granulation of the compound fertilizer, which belongs to the recycling of carrying materials in industrial exhaust gas. The method comprises the steps of fine dust recovery and tail gas washing, and is characterized in that washing liquor is circulated and recycled completely. The method comprises the following operating steps: a, acidification, namely adding inorganic acid aqueous solution into the circulating washing liquor to enable the pH value of the washing liquor to be less than or equal to 6.5; b, vacuum absorption; c, solid-liquid separation; and d, neutralization. The invention provides a process method which recycles tail gas generated in the process of producing the compound fertilizer completely and really implements the zero release of the waste gas, waste residues and waste water in a compound fertilizer producing device, increases S and Ca elements required in plant growth in the compound fertilizer, saves energy resources, is favorable for environmental protection, reduces the production cost of the compound fertilizer, and is suitable for the processing of the tail gas generated in the process of producing the compound fertilizer and compound or mixed fertilizer.

Description

technical field [0001] The invention relates to a method for recycling 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 fertilizer, granulation, hot air drying, cooling, screening, heating. During the process of cooling and other processes, 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] With the increasing awareness of environmental protection, in the prior art, the separated solid dust can be returned to the raw material process to be used as raw material for production by adopting the method of cyclone separation a...

Claims

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Application Information

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IPC IPC(8): B01D47/06B01D47/14B01D53/14B01D53/18B01D53/78
Inventor 吕庆淮
Owner LINYI UNIVERSITY
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