Multi-pollutant removing technique and device of fuel coal smoke

Abstract

The invention discloses a removal technology of removing coal-fired flue gas pollutants and a device thereof. The technology is as follows: an SCR denitration method is first used for removing NOX in the flue gas; then a dust collector is used for removing dusts and ash particles in the flue gas; then a wet calcium-based desulphurization method is used for removing SO2 in the flue gas; then an MEA decarburization process is used for absorbing the SO2 in the flue gas; simultaneously, a pregnant solution of a generated alkanolamine solution is heated, analyzed and regenerated and the generated barren solution of the alkanolamine solution is continuously and cyclically used; and the analyzed CO2 gas with high concentration is produced to be liquid carbon dioxide of industrial grade with high purity after being cooled, gas-liquid separated, dried, compressed and condensed. The device consists essentially of an SCR denitration reactor, the dust collector, a wet calcium-based desulphurization reactor, an MEA decarburization absorption tower, a regeneration tower, a gas-liquid separator, a dryer, a compressor, a condenser and the like which are connected with each other by pipes. The device has simple and compact overall design, low investment and operation costs, and stable and reliable work and can conduct classified integration processing and highly efficient simultaneous removal on every pollutant in the coal-fired flue gas.

Description

technical field [0001] The invention relates to a purification treatment technology for flue gas discharged from combustion, in particular to a coal-fired flue gas multi-pollutant removal process and equipment thereof. Background technique [0002] Acid rain and the greenhouse effect are global environmental problems facing mankind today. Sulfur dioxide SO produced by coal burning 2 and nitrogen oxides NO X Pollution is the main protozoa of acid rain, and the produced carbon dioxide CO 2 is the main greenhouse gas, of which CO 2 emissions account for about 100% of the CO2 from human activities 2 30% of total emissions. my country's energy structure is dominated by coal, and the control of coal-fired flue gas pollution is a requirement for achieving coordinated development of the economy, society, and environment, and is also a requirement for taking advantage of my country's coal reserves and realizing sustainable development of society itself. [0003] At present, mos...

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Problems solved by technology

[0004] In order to solve the existing problems of coal-fired flue gas pollutant dispersion and removal technology, Chinese utility model patent specifications with publication numbers CN2712446Y and CN274697IY proposed a "flue gas desulfurization and denitrification device" and a "desulfurization and denitrification integrated flue gas Gas purification tower", but its desulfurization and denitrification equipment are all bulky packing devices, and directly use ammonia solution to absorb NO in flue gas X , not only the resistance of the whole desulfurization and denitrification equipment is greatly increased, but also the NO in the flue gas cannot be effectively removed X , because NO X More than 90% of the components are nitric oxide NO, and NO is difficult to dissolve in water, and it is difficult to absorb NO by simple washing methods

The Chinese Invention Patent Application Publication No. CN1559654A introduces a "desulfurization, dust removal, denitrification, defluorination wet flue gas purification unit and its purification method", which uses lye to mix with flue gas to remove the flue gas a variety of pollutants, but the unit and the purification method will produce a large amount of wastewater, not only the wastewater needs to be retreated, but also the technical solution for NO X The removal efficiency is too low, and the anti-corrosion requirements for the equipment are also extremely high, resulting in complex processes and high operating costs

[0005] It can be seen that the above-mentioned technical solutions are not ideal for the comprehensive purification treatment of coal-fired flue gas, especially the lack of research on the comprehensive treatment of sulfur dioxide, nitrogen oxides, dust and carbon dioxide in coal-fired flue gas

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