Desulphurization and denitrogenation integrated method

Abstract

The invention relates to a desulphurization and denitrogenation integrated method. The method includes the following steps: putting manganese oxide in two reactors A and B respectively; respectively heating the reactors A and B; feeding flue gas containing SO2 and NOx into the reactor A, and performing reaction at the temperature of 100-700 DEG C to obtain desulphurized tail gas I and desulphurized manganese ore; mixing the desulphurized tail gas I with NH3 prior to feeding the mixture into the reactor B, and performing reaction in the temperature range of 50-400 DEG C to obtain desulphurized and denitrated tail gas II and denitrated manganese ore; discharging the desulphurized manganese ore; adding the denitrated manganese ore into the reactor A, and adding fresh manganese oxide into the reactor B; cycling and repeating in sequence to complete series connection of the desulphurization process in the reactor A and the denitrogenation in the reactor B so as to enable the desulphurization and denitrogenation integrated process to be continuous. The method is high in desulphurization and denitrogenation efficiency, low in cost and good in economic benefit and environmental protection benefit.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a combined desulfurization and denitrification method. Background technique [0002] With the rapid development of my country's economy, my country's energy consumption is also increasing year by year, which increases the consumption of the most important energy raw material, coal, which causes the main air pollutant SO 2 and NO x emissions increase. According to statistics, in 2014, the national SO 2 Emissions reached 19.74 million tons, a slight decrease from 2013. In terms of nitrogen oxides, the total emissions in 2013 reached 22.273 million tons, and the emissions in 2014 decreased compared to 2013 (about 5% reduction). Most of them SO 2 and NO x of emissions come from coal combustion in the power sector. Thanks to SO 2 and NO x It can cause photochemical smog, acid rain, etc., causing irreversible harm to the human ecological environment. For this re...

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Problems solved by technology

The method has the advantages of simple process and can simultaneously remove SO in the same equipment and in the same process. 2 and NO x advantages, but the disadvantages are: (1) The reaction rate is low, and the reaction can only reach 80% desulfurization rate and denitrification rate in the initial stage (within 30 minutes). (The desulfurization rate and denitrification rate both dropped below 50% after 50 minutes of reaction), and the SO-containing 2 and NO x Concentrations of 1920ppm and 480ppm into the furnace gas, SO in the exhaust gas 2 >960ppm, NO x >240ppm, on the one hand, the desulfurization and denitrification tail gas cannot meet the emission requirements; on the other hand, the manganese resources are wasted due to the low utilization rate of manganese ore; (2) desulfurization and denitrification conflict with each other. NH at high temperature 3 The increase in the degree of autoxidation in turn inhibits the NH 3 with NO x reaction, so that the denitrification rate decreased (see SimultaneousSO x / NO x removalinafluidizedbedreactorusingnaturalmanganeseore, "JournalofChemicalTechnologyandBiotechnology", 2001,76(10):1080-1084)

[0006] The above shows that it is feasible to use manganese oxide ore for flue gas desulfurization and denitrification, but the existing dry technology is not thorough in desulfurization and denitrification, the utilization rate of manganese is low, and it has no industrial value

The wet process technology is due to the by-product MnS 2 o 6 Secondary pollution and other issues have not attracted the attention of the industry

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