Device and method for preparing sulfite

A technology of sulfite and acid sulfite, which is applied in the field of devices for preparing ammonium sulfite, ammonium sulfite, sodium metabisulfite and sodium sulfite, and can solve the problems of low purity of ammonium sulfite and ammonium sulfate.

Pending Publication Date: 2020-10-20
NANJING LIUYAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved in the present invention is to overcome the low purity of the production...

Method used

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  • Device and method for preparing sulfite
  • Device and method for preparing sulfite
  • Device and method for preparing sulfite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A kind of device for preparing sulfite The device is as follows:

[0078] Including five unit processes, including SO 2 After passing through the flue gas conditioning unit, the raw gas enters the acid sulfite preparation unit, the preparation of basic sulfite slurry and the residual SO 2 After the gas reabsorption unit is discharged out of the system, the synthesized intermediate slurry successively passes through the acid sulfite conditioning unit, the target product separation unit, and the product drying unit to finally obtain the solid phase target product or liquid phase target product.

[0079]The flue gas conditioning unit includes key node equipment and process flow such as a conditioning agent storage tank 11, a conditioning agent feeder 12, a flue gas conditioner 13, a dust collector 14, and a feeder 16; The preparation unit of acid sulfite includes key node equipment and process flow such as first-level re-spray pipe 21, first-level separation chamber 22, c...

Embodiment 2

[0089] Embodiment 2 ammonia method produces solid ammonium sulfite

[0090] S1 flue gas conditioning: In the flue gas conditioner, use the alkaline powder material from the conditioner feeder to absorb HF, HCl, SO3 and other components in the raw gas to generate solid particles, which are collected by the dust collector The flue gas that is intercepted and passed through the dust collector is the target gas. As the alkaline powder material, quicklime powder and slaked lime powder are selected and combined according to the ratio of the amount of substances (0.05-0.15): 1, and the median diameter of the powder is between 30-100 microns.

[0091] S2. Preparation of acid sulfite: The flue gas passing through the dust collector is in cross-flow contact with the absorbent in the primary re-nozzle to generate acid sulfite. When the pH value of the slurry in the primary separation chamber reaches 3.8-4.9 , corresponding to the relative density of the slurry is 1.18 ~ 1.20, the reacti...

Embodiment 3

[0098] Embodiment 3 ammonium bicarbonate method produces solid ammonium sulfite

[0099] S1, flue gas conditioning: the same as Example 2.

[0100] S2, preparation of acidic sulfite: same as example 2.

[0101] S3. Preparation of basic sulfite slurry: the residual gas not absorbed by the first-stage re-nozzle is further absorbed by the second-stage re-nozzle to generate basic sulfite slurry. Fresh absorbent comes from solid ammonium carbonate or bicarbonate outside the system.

[0102] Further, the pH value of the slurry in the secondary separation chamber is controlled from 5.1 to 10.0, and the preferred pH value control range is 5.6 to 8.0;

[0103] S4, residual SO 2 Reabsorption of gas: same as Example 2.

[0104] S5. Conditioning of acid sulfite: use liquid ammonia or ammonia water with a mass concentration of 15% to 33% to neutralize the slurry in the neutralization tank, and control the stirring rate at 26 to 43r / min. When the pH value reaches 7.3 After ~7.6, the re...

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Abstract

The invention discloses a device for preparing sulfite. SO2-containing feed gas passes through a flue gas conditioning unit, then enters an acidic sulfite preparation unit and a basic sulfite slurry preparation and residual SO2 re-absorption unit in sequence, and is discharged out of the system; the synthesized intermediate slurry passes through an acidic sulfite conditioning and target product separating unit and a product drying unit in sequence, and finally a solid-phase target product or a liquid-phase target product is obtained. Ammonia in the feed gas can be fully recycled by the deviceand method, the ammonia consumption of a unit product can be reduced by 1/4-1/2, and the production cost of a target product is lower. The primary purity of the target product is high, secondary separation and purification are not needed, the loss in a purification step is avoided, and the yield of the target product can be increased by 0.8%-2.3% according to empirical analysis. The primary purityof the target product reaches 98.5-99.3%, one set of process equipment can be used for producing various products, and the market requirements can be better met.

Description

technical field [0001] The invention relates to a device and method for preparing sulfite, which belongs to the field of chemical industry or the field of environmental protection using ammonia desulfurization technology, and specifically relates to a device for preparing ammonium sulfite, ammonium bisulfite, sodium pyrosulfite and sodium sulfite by using SO2 flue gas method. Background technique [0002] The regeneration process of activated carbon desulfurization technology releases SO 2 (Volume fraction 10%~25%), NH 3 (volume fraction 5% to 15%) and other components of waste gas can be used as products with high added value such as sulfite, such as ammonium sulfite and ammonium bisulfite. Due to the complexity of the original components of the exhaust gas, when it is directly used to produce sulfite, the quality of the target product is not good, and there is no market competitiveness. In the past, the market was often used to produce ammonium sulfate that did not requ...

Claims

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Application Information

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IPC IPC(8): C01C1/22C01D5/14B01D53/50B01D53/75B01D53/79B01D53/83
CPCB01D53/504B01D53/508B01D53/75B01D53/79B01D53/83B01D2251/206B01D2251/2062C01C1/22C01D5/14C01D5/145C01P2006/80
Inventor 吴振山王康徐延忠刘大华陈任远
Owner NANJING LIUYAN ENVIRONMENTAL PROTECTION TECH CO LTD
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