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Process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber

An ammonium method and absorbent technology, applied in the field of recycling process, can solve the problems of low economic added value, waste pollutants, material loss, etc., and achieve the effects of reducing heat preservation time, reducing degradation, and reducing energy consumption

Active Publication Date: 2010-06-30
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, what this method obtains must be a mixed product of ammonium sulfite and other substances, which needs further processing, and must also have material loss and other waste pollutants.
[0005] At present, there are many desulfurization methods for exhaust gas, but most of them generate ammonium sulfate with very low economic added value and are used to prepare chemical fertilizers
In addition, in the process of absorbing smoke, there is also the problem of low absorption rate.

Method used

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  • Process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The flue gas is firstly dedusted by the electrostatic precipitator, and after the dedusted flue gas is pressurized by the induced draft fan, the amount of flue gas entering the induced draft fan is 310800m 3 / h, the flue gas enters the liquid collection tank at the bottom of the desulfurization tower, sprays excess ammonia water and reacts with sulfur dioxide to form ammonium sulfite and ammonium bisulfite. A mixture of ammonium bisulfite and ammonium sulfite ammonia is formed in the liquid collection tank. The mixture is pumped to the height of the tower and sprayed downward through the three-layer spray device in the middle of the tower. The gas is evenly mixed to absorb the residual sulfur dioxide in the flue gas. Ammonium bisulfite in the mixture reacts with sulfur dioxide to obtain ammonium sulfite and returns to the liquid collection tank. Such repeated cycles will completely absorb the sulfur dioxide in the flue gas. The temperature in the desulfurization tower...

Embodiment 2

[0062] The flue gas first passes through the filter and dust removal equipment for dust removal. After the dust removal flue gas is pressurized by the induced draft fan, the amount of flue gas entering the induced draft fan is 200,000~400,000m 3 / h, into the liquid collection tank at the bottom of the desulfurization tower, spraying excess ammonia water with a concentration of 0.8-11% to react with ammonium bisulfite to generate ammonium sulfite. A mixture of ammonium bisulfite and ammonium sulfite ammonia is formed in the liquid collection tank, and the mixture is pumped to the height of the tower, and sprayed downward through the second-layer spray device in the middle of the tower, and the upward smoke The gas is evenly mixed to absorb the residual sulfur dioxide in the flue gas. Ammonium bisulfite in the mixture reacts with sulfur dioxide to obtain ammonium sulfite and returns to the liquid collection tank. The temperature in the desulfurization tower is 90-120°C; the pre...

Embodiment 3

[0076] The flue gas is firstly dedusted by the electrostatic precipitator, and after the dedusted flue gas is pressurized by the induced draft fan, the intake volume of the induced draft fan is 305,000-400,000m 3 / h, the flue gas enters the liquid collection tank at the bottom of the desulfurization tower, sprays excess ammonia water and reacts with sulfur dioxide to form ammonium sulfite and ammonium bisulfite. A mixture of ammonium bisulfite and ammonium sulfite ammonia is formed in the liquid collection tank. The mixture is pumped to the height of the tower and sprayed downward through the three-layer spray device in the middle of the tower. The gas is evenly mixed to absorb the residual sulfur dioxide in the flue gas. Ammonium bisulfite in the mixture reacts with sulfur dioxide to obtain ammonium sulfite and returns to the liquid collection tank. Such repeated cycles will completely absorb the sulfur dioxide in the flue gas. The temperature in the desulfurization tower is...

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Abstract

The invention relates to a process for performing ammonium sulfite pulping by using a sulfur-containing flue gas absorber, which comprises the following steps: (1) performing desulphurization on flue gas by using ammonia water, wherein the flue gas is sulfur-containing flue gas; and (2) performing ammonium sulfite pulping during papermaking by using sulfurous acid mixed solution obtained after the desulphurization. In the process, a high-efficiency flue gas absorption system is adopted; the obtained ammonium sulfite is used for ammonium sulfite pulping in papermaking industry; and heavy contaminated condensate produced by pulping can also be used for absorbing sulfur dioxide in the flue gas. The scheme of the invention not only minimally reduces the environmental pollution, but also recycles the resources. The process is particularly suitable to be used in a paper mill with a self-owned power plant.

Description

technical field [0001] The invention relates to a recycling process, in particular to a treatment method using industrial flue gas, and more specifically, to a process of using sulfur-containing flue gas absorbers to carry out pulping by the ammonium method. Background technique [0002] As we all know, coal-fired boilers or thermal power plants produce a large amount of flue gas, which contains SO 2 , SO and other harmful substances have seriously damaged the earth environment on which human beings depend and endangered people's health. Therefore, various methods for treating and absorbing coal-burning flue gas have emerged as the times require, among which the alkaline method is more effective, and the alkaline method mostly uses ammonia for absorption. [0003] For example, patent application 200310115522 discloses a method for desulfurizing flue gas with ammonium sulfite and ammonium bisulfite solution, which uses ammonia to adjust the pH value in the desulfurization to...

Claims

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Application Information

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IPC IPC(8): D21C3/14B01D53/78B01D53/50B01D53/96D21C11/02D21C7/00
Inventor 李洪法李玉林杨吉慧王延军贾明昊
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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