Circulation 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 technology, can solve the problems of ammonium sulfate with low economic added value, increased production and operation costs, cumbersome purification and refining links, etc., to shorten the time of cooking and heat preservation, shorten the heat preservation time, Reduce the effect of degradation

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, the article did not disclose its specific details. At present, the ammonium sulfite used in papermaking usually requires high purity, while the ammonium sulfite obtained by absorbing flue gas generally has complex components and requires cumbersome purification and refining links, which greatly increases the production operation. cost
[0009] In summary, most of the current flue gas desulfurization methods are inefficient
And after the flue gas is desulfurized, ammonium sulfate with very low economic added value is produced and used to prepare chemical fertilizers. This treatment is also a great waste

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0078] 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, first enter the Venturi tube, the waste ammonia water tank is connected with the Venturi tube, spray 1-3% ammonia water into the Venturi tube to absorb the sulfur dioxide in the flue gas to obtain the ammonium bisulfite mixed liquid. And adjust the injection amount of ammonia water through the pH detection device and the sulfur dioxide detection device to control the N / S substance mass ratio to be 39:64.

[0079] The flue gas mixture from the Venturi tube enters the liquid collection tank at the bottom of the desulfurization tower, where excessive ammonia water is injected to react with ammonium bisulfite to form ammonium sulfite. A mixture of ammonium bisulfite and ammonium sulfite ammonia is formed in the liquid collection tank. The mixture is pumped to the he...

Embodiment 2

[0094] 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

[0108] 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, first enter the Venturi tube, the waste ammonia water tank is connected to the Venturi tube, and spray 1-3% ammonia water into the Venturi tube to absorb the sulfur dioxide in the flue gas to obtain a mixed solution of ammonium bisulfite. And the mass ratio of N / S substance is controlled to be 35:70-45:60 through the pH detection device and the sulfur dioxide detection device.

[0109] The flue gas mixture from the Venturi tube enters the liquid collection tank at the bottom of the desulfurization tower, where excessive ammonia water is injected to react with ammonium bisulfite to form ammonium sulfite. 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 ...

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Abstract

The invention relates to a circulation 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; (2) performing ammonium sulfite pulping during papermaking by using sulfurous acid mixed solution obtained after the desulphurization; and (3) performing desulphurization on the flue gas in the step (1) by recycling ammonia-containing contaminated condensate produced during the ammonium sulfite pulping. In the circulation process, a high-efficiency flue gas absorption system is adopted; the obtained ammonium sulfite is used for ammonium sulfite pulping in papermaking industry; and the 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 circulation 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 utilizing industrial flue gas, and more specifically, to a recycling process utilizing sulfur-containing flue gas absorbers to carry out pulping by the ammonium method. Background technique [0002] With the development of industrial production, more and more toxic waste gases and waste liquids are discharged into nature, seriously damaging the earth environment on which human beings depend. For example, coal-fired boilers or thermal power plants produce a large amount of flue gas, which contains SO 2 , SO 3 A variety of harmful substances, such as acid rain, have also induced a variety of human respiratory diseases. In addition, in the paper industry, especially in the cooking process of ammonium pulping, a large amount of ammonia-containing condensed water will be produced. At present, this condensed water is generally discharged directly after chemical treatment. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/14B01D53/78B01D53/50B01D53/96D21C11/02D21C7/00
Inventor 李洪法宋明信贾明昊杨吉慧李玉林郭良进李晓光丁志钢程磊
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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