Process and device for producing (NH4)2SO4 fertilizer by using ammonium sulfite solution

Abstract

The invention discloses a process and a device for producing a (NH4)2SO4 fertilizer by using an ammonium sulfite solution. In an ammonia-process flue gas desulfurization device, by using the ammonium sulfite solution (NH4)2SO3 produced after ammonia absorbs SO2, the outlet of a liquid inlet ejector (9) is led into the solution at the middle lower part of an oxidation tank (2) by a downcomer through a oxidization preparation process of (NH4)2SO4 fertilizer by self-absorption of air so as to increase the reaction time; and the medium is fully oxidized through the three-stage cyclic oxidation. The cyclic oxidation procedure comprises liquid at the lower part of the oxidation tank (2), a recycle pump (4), a recycle liquid ejector and the middle lower part of the oxidation tank. Air is absorbed in the liquid inlet ejector, and sheared by liquid flows and dispersed into tiny air particles, so that the contact specific area of the gas and the liquid is increased by tens of times compared with the bubbling oxidization, thereby fully utilizing the oxygen in the air. Therefore, the process enhances the reaction efficiency, shortens the reaction times and increases the conversion rate.

Description

technical field [0001] The present invention relates to (NH 4 ) 2 SO 4 The technical field of chemical fertilizer production, especially suitable for a kind of preparation of ammonium sulfite solution (NH 4 ) 2 SO 4 Fertilizer technology and equipment. Background technique [0002] SO in boiler flue gas 2 After being absorbed by ammonia liquid, it forms (NH 4 ) 2 SO 3 , while the recovered by-products in flue gas desulfurization are (NH 4 ) 2 SO 4 (as a chemical fertilizer, it is easy to sell in the market), so in the ammonia desulfurization process, it is necessary to use (NH 4 ) 2 SO 3 Oxidized to (NH 4 ) 2 SO 4 , This oxidation process adopts self-priming air oxidation, which has the lowest cost and is the easiest to control. Traditional (NH 4 ) 2 SO 3 The oxidation technology adopts the method of blowing the air directly into the liquid layer in the oxidation tank after being pressurized by the blower for bubbling oxidation. Due to the large bubbles ...

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Problems solved by technology

[0003] To solve the traditional (NH 4 ) 2 SO 3 Oxidation process adopts air pressurization and directly blows into the method, the problem of long reaction time and low oxidation rate, the invention provides a kind of preparation (NH 4 ) 2 SO 4 The process and equipment of chemical fertilizers make full use of the oxygen in the air, so that the reaction efficiency is improved, the reaction time is shortened, and the conversion rate is increased.

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