Active coke desulfurization and denitration and membrane separation and dust removal integrated system and active coke desulfurization and denitration and membrane separation treatment method

Abstract

The invention discloses an active coke desulfurization and denitration and membrane separation and dust removal integrated system and an active coke desulfurization and denitration and membrane separation treatment method. The system comprises an inorganic membrane filter, a desulfurization and denitration moving bed reaction tower and a regeneration tower. The method comprises the steps that a high-temperature flue gas flows through a ceramic membrane terminal filter, and the separation of a gas and dust in the flue gas is realized at high temperature by utilizing the selection screening and permeability of a membrane material; the obtained dedusted flue gas flows into a bed body along a side line of the bottom of a moving bed, so that the flue gas is in reverse contact with active coke, and SO2 is removed in a desulfurization layer; the flue gas continues to rise and flows into a denitration layer, so that the flue gas is reacted with ammonia under the action of the active coke to obtain N2 and H2O and other clean gases to be emptied; the active coke is desulfurized and denitrated and then the desulfurized and denitrated active coke enters an adsorption regeneration device to realize the regeneration so as to achieve the purpose of recycling, and the removed SO2 is recycled. The system provided by the invention has the advantages of small occupied area, low treatment cost, no secondary pollution and the like.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to an integrated system and treatment method for active coke desulfurization and denitrification, membrane separation and dust removal. Background technique [0002] In recent years, with the growth of the economy, the consumption of fossil energy is also increasing. In my country, coal is the main energy source, and the combustion of coal will produce a large amount of air pollutants, among which SO 2 , NO x Dust is the most harmful. Due to the discharge of a large amount of air pollutants, haze weather and acid rain often occur in some areas of our country, which have a great adverse effect on the ecological environment and people's health. For this reason, the country has gradually raised the emission standards of air pollutants, which makes us need to re-examine the problems faced by the existing desulfurization, denitrification and dust removal technologies, and explore ne...

AI Technical Summary

Problems solved by technology

(1) Existence of electrostatic dust removal: complex structure, high one-time investment; dust removal efficiency is greatly affected by dust specific resistance, generally the dust whose specific resistance is less than 104-105 Ω cm or greater than 1010-1011 Ω cm, if certain measures are not taken, dust removal Efficiency will be affected; for initial concentrations greater than 30g / cm 3 The dusty gas needs to be equipped with pretreatment devices, etc.

(2) Existence of bag dust removal: For high temperature gas, cooling measures must be taken; easy to wear and short life, frequent replacement of bag

There are problems such as many technological processes, complicated pipelines, large equipment occupation area and difficult maintenance.

[0005] Patent CN1712108A discloses a flue gas desulfurization and denitrification process, which strictly divides the desulfurization layer and the denitrification layer into two sections, and the middle joint is narrow, so that the active coke cannot move down smoothly; secondly, the CO content in the regeneration gas is small, so it is difficult to separate ; In addition, when the flue gas temperature is between 120°C and 180°C, CO is used as the reducing agent and NO x The reaction rate is slow, and the denitrification effect is not as good as using NH 3

[0006] Patent CN1911491A discloses a moving bed flue gas desulfurization, denitrification and dust removal process, which directly passes the raw flue gas into the desulfurization and denitrification moving bed, so that the active coke of the moving bed has three functions of desulfurization, denitrification and dust removal, but with the running time , the active coke will be mixed with a large number of dust particles, the small particles and complex composition of these dust will reduce the performance of the active coke after regeneration, thereby reducing the service life of the active coke

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