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Synchronous desulphrization and denitration method of flue gas pyrolusite pulp for reclamation

A technology for coal-fired flue gas, desulfurization and denitrification, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve problems such as economic loss, inability to absorb nitrogen oxides, air pollution, etc. The effect of abundant reserves and low price

Active Publication Date: 2009-11-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ) is an "acid gas" that causes acid rain and an "indirect greenhouse gas" that causes the greenhouse effect, which brings extensive harm to the environment and significant economic losses
[0008] In view of the prior art of using pyrolusite to control coal-fired flue gas pollution, pyrolusite can only be used to absorb and remove sulfur dioxide in coal-fired flue gas, but cannot absorb and remove nitrogen oxides in flue gas. Pollution in China is still serious, and the harm of acid rain still exists

Method used

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  • Synchronous desulphrization and denitration method of flue gas pyrolusite pulp for reclamation

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Embodiment 1

[0035] Take the treatment of a coal-fired boiler with a scale of 35t / h as an example. The amount of exhaust gas to be treated is 60000Nm 3 / h, SO in exhaust gas 2 The content is 3000ppm, NO X Content is 1500ppm, and the technological process of the present embodiment is as figure 1 shown. First crush the pyrolusite into pyrolusite powder of no more than 100 meshes, then put the pyrolusite powder, water and metal chelating agent polyacrylic acid into the pulp tank equipped with agitator, and prepare the pulp with a liquid-solid mass ratio of 3:1 , wherein the mass content of polyacrylic acid is 0.3% of the mass content of pyrolusite. Drive the slurry into the removal reactor through the slurry pump, containing SO 2 , NO X The flue gas first passes through the wet dust collector to cool and humidify, then enters the removal reactor, and is dispersed into the pulp by the gas dispersion device to be absorbed. SO in flue gas 2 , NO X Absorption reaction with pyrolusite pul...

Embodiment 2

[0037] The technological process of this embodiment is as figure 2 shown. In this embodiment, the technological process from preparing pyrolusite pulp to preparing the primary product of the mixed mother solution of manganese sulfate and manganese nitrate is the same as that of embodiment 1. This embodiment follows embodiment 1 to produce manganese sulfate and manganese nitrate finished products. Heat the mixed mother liquor of relatively pure manganese sulfate and manganese nitrate to about 100°C to evaporate and concentrate it, so that the manganese sulfate contained in it undergoes a crystallization reaction. Manganese crystals are dried at 150°C to 200°C for two hours to obtain the product manganese sulfate. Cool the remaining liquid after heating crystallization and solid-liquid separation to about 20°C. The manganese nitrate contained in the liquid undergoes a crystallization reaction. The manganese nitrate crystals are dried at 100°C to 110°C for two hours to obtain ...

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Abstract

The invention discloses a synchronous desulphrization and denitration method of flue gas pyrolusite pulp for reclamation. The method mainly comprises the following steps: pyrolusite, water and metal-chelator are prepared into pulp which is taken as an absorbing agent; sulfur dioxide and nitrogen oxides in the flue gas are synchronously absorbed and removed by the absorbing agent; the flue gas is discharged when the purification reaches a standard; the primary product of the mixed mother solution of manganese sulfate and manganese nitrate is obtained after absorbing tail solution is purified; and by utilizing the different solubility of manganese sulfate and manganese nitrate at same temperature, the mixed mother solution is heated firstly to cause the manganese sulfate therein to be crystallized and separated, next, the left mother solution is cooled to cause the manganese nitrate therein to be crystallized and separated, and the left solution is returned to preparation pulp for recycling. No waster water is discharged in the whole process, thereby achieving the purposes of controlling waste by waste, recycling sulfur resources and improving the comprehensive utilization value of pyrolusite. The method is characterized by high desulphrization and denitration efficiency and manganese utilization rate, little secondary pollution, obvious economic benefit and the like.

Description

technical field [0001] The present invention relates to coal-fired flue gas resource management technology, in particular to a method for absorbing and removing sulfur dioxide and nitrogen oxides in coal-fired flue gas by using pyrolusite as an absorbent, which is used for waste gas of coal-fired flue gas sulfur dioxide and nitrogen oxides Treatment and development and utilization of pyrolusite is a method of recycling sulfur and nitrogen resources and comprehensive utilization of manganese resources. Background technique [0002] Sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ) is an "acid gas" that causes acid rain and an "indirect greenhouse gas" that causes the greenhouse effect, which brings extensive harm to the environment and significant economic losses. As early as 1996, the NO x Emissions are as high as 12 million tons. In 2005, SO in exhaust gas nationwide 2 The emissions were 25.493 million tons, ranking first in the world. SO 2 and NO x 90% of pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/80C22B3/06C22B47/00
CPCY02A50/20Y02P10/20
Inventor 苏仕军丁桑岚
Owner SICHUAN UNIV
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