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Coal-fired flue gas pyrolusite pulp recycling denitration method

A technology of coal-burning flue gas and pyrolusite, which is applied in chemical instruments and methods, separation methods, manganese nitrate, etc., can solve the problems of difficult steel smelting industry, high production costs, and heavy environmental pollution. Secondary pollution, abundant reserves, and high oxidation efficiency

Inactive Publication Date: 2011-02-16
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] There are abundant reserves of pyrolusite in the central and western regions of my country, but most of them are poor and inferior ores with a manganese grade lower than 25%, which are difficult to be used in the iron and steel smelting industry. A new technology for denitrification of pulp flue gas, that is, the use of NO in coal-fired flue gas X MnO in pyrolusite 2 The oxidation-reduction properties of manganese nitrate can be used for denitrification, and the by-product of manganese nitrate with wide application can not only effectively reduce the harm of NOx, but also overcome the traditional production process of manganese nitrate with high heat consumption, acid consumption, high production cost and environmental pollution. In order to achieve the dual purpose of flue gas purification and product resource utilization, it is in line with my country's circular economy, waste resource utilization policies and the purpose of building a resource-saving and environment-friendly society, and has broad application prospects

Method used

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Examples

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Embodiment 1

[0026] 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, NO in exhaust gas X The content is 1000mg / m 3 , the process flow of this embodiment is as follows figure 1 shown. Firstly, the pyrolusite powder and water not more than 100 meshes are prepared into a slurry with a liquid-solid mass ratio of 3:1 in a slurry tank equipped with an agitator, and the slurry is driven into the removal reactor through a slurry pump, and after desulfurization In the flue according to O 3 The / NO molar ratio is 1:1 and the ozone is injected, and the oxidation time is ≥0.5S. The oxidized flue gas enters the removal reactor, and then enters the pulp to be absorbed by the gas dispersion device. NO in flue gas X Absorption reaction with pyrolusite pulp absorbent to remove NO in exhaust gas X Absorption and removal, NOX The gas after the removal reaches the standard is discharged from the gas outlet of the re...

Embodiment 2

[0028] This example is basically the same as Example 1, except that the manganese nitrate solution is added to the impurity removal agent for solid-liquid separation after the impurity removal reaction, and the separated liquid phase is not directly sent to the concentration reactor for heating and concentration to produce Manganese nitrate products, but first static precipitation, after sufficient precipitation and purification treatment, sent to the concentration reactor for heating and concentration to produce manganese nitrate products, the produced manganese nitrate products have higher purity. The technological process of this embodiment is as figure 2 shown.

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Abstract

The invention discloses a coal-fired flue gas pyrolusite pulp recycling denitration method, which mainly comprises the following steps of: injecting ozone into desulfurized coal-fired flue gas, and oxidizing NO in the coal-fired flue gas into water-soluble NO2; taking ore pulp prepared from water and low-grade pyrolusite as an absorbent so as to make the pyrolusite pulp and the coal-fired flue gas directly contacted to carry out an absorption and denitration reaction; removing NOX in the flue gas, purifying the coal-fired flue gas to meet the standard for discharging, performing solid-liquid separation on the reacted ore pulp to prepare mixed solution of manganese nitrate; and purifying and removing impurities from the mixed solution of manganese nitrate so as to prepare mother liquor of manganese nitrate, and heating and concentrating the mother liquor of manganese nitrate to prepare industrial products comprising 50 percent of manganese nitrate. Wastewater is not discharged in the whole technical process, so the aims of treating exhaust gas through the low-grade pyrolusite and recycling and preparing manganese nitrate with economic value are fulfilled. The method has the characteristics of high denitration rate, high manganese utilization rate, obvious economic benefit and the like, and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a method for removing NOx in coal-fired flue gas by using ozone as a gas-phase oxidant and pyrolusite slurry as a liquid-phase absorbent, which is used for waste gas treatment and softening of coal-fired flue gas NOx. The development and utilization of manganese ore is a method of comprehensive recycling of nitrogen resources and manganese resources. Background technique [0002] Nitrogen oxides (NO x ) is an "acid gas" that causes acid rain, and is also an important atmospheric pollutant that causes photochemical smog and damages the ozone layer, bringing extensive harm to the environment and significant economic losses. my country is a large energy consumption country dominated by coal. The proportion of coal in my country's energy consumption is about 70%. Coal combustion is the main source of NOx in my country. In 2008, my country's industrial coal consumption ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56C01G45/08B01D53/75B01D53/76B01D53/80
Inventor 孙维义苏仕军丁桑岚
Owner SICHUAN UNIV
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