Exhaust gas dedusting, denitration and desulfuration method for thermal power plant

A technology for thermal power plants and flue gas, which is applied in combustion methods, separation methods, chemical instruments and methods, etc., can solve the problems of reduced thermal efficiency of boilers, increased primary air and flue gas, and poor heat transfer effects, and can achieve the purpose of catalyst use. The effect of less amount, high denitration efficiency and high flame retardancy
CN102393023AInactive Publication Date: 2012-03-28NANJING LONGYUAN ENVIRONMENTAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING LONGYUAN ENVIRONMENTAL CO LTD
Publication Date
2012-03-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an exhaust gas dedusting, denitration and desulfuration method for a thermal power plant. According to the invention, after being dedusted firstly by a bag-type dust collector, high-temperature raw exhaust gas is introduced in an SCR (selective catalytic reduction) reactor for performing SCR for realizing denitration, and then, the exhaust gas subjected to denitration passes through an air preheater and a heat exchanger in sequence to be cooled to 90-100 DEG C, and then is subjected to wet desulfuration in a desulfurizer; and the exhaust gas subjected to desulfuration and discharged from the desulfurizer is heated to 100-105 DEG C by the heat exchanger and then enters a chimney to be discharged. In the bag-type dust collector, filter cloth in a filter bag has base cloth which is PBO (Poly-p-phenylenebenzobisthiazole) fiber woven cloth and has two surface layers referring to composite fibrofelts formed by cross-laying of PBO fiber nets and basalt fiber nets, the base cloth is sandwiched between the two surface layers and sewed up into a whole body, the whole body is subjected to hot rolling, singeing and heat shaping, Teflon dipping and drying to finally form high-temperature resistant filter cloth. By the adoption of the high-temperature resistant filter bag, the raw exhaust gas can be dedusted firstly at a high temperature and then is subjected to denitration, therefore, ash fouling of subsequent equipment and damages to a catalyst can be reduced, and the effects of low catalyst consumption and high denitration efficiency can be achieved; and since the catalytic reaction does not need additional heat, the effects of energy saving and emission reduction are achieved.
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Description

technical field

[0001] The invention relates to a dust removal, denitrification and desulfurization method for flue gas in a thermal power plant, in particular to a denitrification and desulfurization method for bag dust removal under high temperature (above 380°C) conditions. Background technique

[0002] In recent years, with the increasingly stringent environmental protection regulations and the gradual rise in fuel prices, energy conservation and environmental protection have been widely valued, and higher requirements have been put forward for the discharge of high-temperature flue gas in thermal power plants and energy conservation and consumption reduction in flue gas treatment, especially It is the emission of NOx in the flue gas that has attracted great attention from the society. In addition to the traditional dust removal and desulfurization treatment, the flue gas also needs to be denitrified to ensure that the SO 2 and NO X Emission standards can be met. At pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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