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Treatment method of digesting waste steam produced by soda pulping process

A technology of alkaline pulping and treatment method, which is applied in the direction of pulping waste gas treatment, separation method, chemical instrument and method, etc. effect, the effect of eliminating odor

Active Publication Date: 2014-03-26
山东光华纸业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline steam is not poisonous, but it will make the air contain alkaline smell and bring certain odor pollution to the surrounding environment
At present, there is no good treatment method for the waste steam generated by alkaline pulping and cooking, and most enterprises empty it for disposal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The cooking waste steam produced by alkaline pulping is pretreated, that is, the cooking waste steam first flows through the steam-water separator, and after the steam-water is separated, it enters the heat exchanger for heat exchange. After the heat exchange, the cooking waste steam enters the warm water tank and is generated by the heat exchanger. After the condensed water is sprayed, the cooking waste steam enters the desulfurization tower. The flue gas flow rate of the boiler entering the desulfurization tower is 154000 m 3 / h and the spraying amount of lime emulsion with a concentration of 8% is constant, use the valve to control the flow of cooking waste steam into the desulfurization tower, so that the flow of cooking waste steam entering the desulfurization tower is 5086m 3 / h, to make the cooking waste steam mixed with flue gas and lime emulsion. After measurement, the S content in the flue gas discharged from the desulfurization tower is 288.7mg / m 3 , Na con...

Embodiment 2

[0023] The treatment steps of the cooking waste steam are the same as in Example 1, except that the amount of cooking waste steam entering the desulfurization tower is 8650 m 3 / h. After measurement, the S content in the flue gas discharged from the desulfurization tower is 284.2 mg / m 3 , Na content is 83.4 mg / m 3 , K content is 9.3 mg / m 3 .

Embodiment 3

[0025] The treatment steps of the cooking waste steam are the same as in Example 1, except that the amount of cooking waste steam entering the desulfurization tower is 10170 m 3 / h. After measurement, the S content in the flue gas discharged from the desulfurization tower is 279.6 mg / m 3 , Na content is 84.5 mg / m 3 , K content is 9.8 mg / m 3 .

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PUM

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Abstract

The invention discloses a treatment method of digesting waste steam produced by soda pulping process. The digesting waste steam produced by the soda pulping process is fed into a de-sulfurizing tower to be mixed with lime emulsion sprayed by the de-sulfurizing tower and boiler smoke entering the de-sulfurizing tower in the de-sulfurizing tower, thereby enabling Na content in the smoke discharged from the de-sulfurizing tower is less than 100mg / m3 and enabling K content in the smoke is less than 50mg / m3. The method is simple and easy to operate, de-sulfuration of the lime emulsion is further assisted while eliminating alkaline air peculiar smell of the digesting waste steam, and de-sulfuration effect to the smoke is improved.

Description

technical field [0001] The invention relates to a treatment method for cooking waste steam from alkaline pulping. Background technique [0002] In the traditional soda pulping process, wood is mixed with lye, and the steam generated by the boiler is used for cooking. The flue gas generated by the boiler must enter the desulfurization tower and be discharged after being sprayed with lime emulsion. During the cooking process of alkaline pulping, a large amount of cooking waste steam, that is, alkaline steam, is produced. The waste steam condensate is tested with pH test paper, and the obtained pH value is 10, indicating that its alkali content is very high. Although the alkaline steam is not poisonous, it will cause the air to contain an alkaline smell and bring certain odor pollution to the surrounding environment. At present, there is no good treatment method for the waste steam generated by alkaline pulping and cooking, and most enterprises empty it for disposal. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/06B01D53/80B01D53/50
Inventor 马修国周传宝徐洪祥王永梅苏忠廷姜亦太
Owner 山东光华纸业集团有限公司
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