Biomass boiler flue gas treatment ultralow emission system

Abstract

The invention provides a biomass boiler flue gas treatment ultralow emission system which comprises a boiler, a ceramic fiber catalytic dust collector, a CFB absorption tower, a bag type dust collector, an induced draft fan and a chimney. An outlet of the ceramic fiber catalytic dust remover is connected with an inlet of the CFB absorption tower, flue gas subjected to dust removal and denitration by the ceramic fiber catalytic dust remover is introduced into the CFB absorption tower for desulfurization, the CFB absorption tower is connected with the bag type dust remover through a first outlet flue, an outlet of the bag type dust remover is connected with the chimney through an induced draft fan, and the chimney is connected with the CFB absorption tower through a second outlet flue. Clean flue gas subjected to dust removal by the bag type dust remover is discharged into the atmosphere through an induced draft fan and a chimney. The ceramic fiber catalytic dust removal and CFB semi-dry desulfurization process is applied to biomass flue gas treatment as the core, ultralow emission of NOx, sulfur dioxide and dust can be achieved, and the purpose of efficiently purifying flue gas is achieved.

Description

【Technical field】 [0001] The invention relates to the technical field of biomass flue gas purification treatment, in particular to an ultra-low emission system for biomass boiler flue gas treatment. 【Background technique】 [0002] A biomass boiler is a type of boiler, and a boiler that uses biomass energy as fuel is called a biomass boiler. The efficiency of biomass boilers is generally above 80%, which is 15% higher than the average efficiency level of coal-fired boilers. However, it will still release a large amount of dusty smoke after burning. If it is directly discharged into the atmosphere, it will cause certain pollution to the environment. In the prior art, the following methods are often used to purify the flue gas: [0003] 1. Cloth bag + activated carbon denitrification + wet desulfurization process; [0004] 2. SNCR + cloth bag + oxidation denitrification + wet desulfurization process; [0005] 3. Rotary spray + semi-dry desulfurization + cloth bag + GGH + lo...

AI Technical Summary

Problems solved by technology

[0007] There are certain defects in the above-mentioned flue gas purification method: when using activated carbon dry desulfurization and denitrification process, the material is easy to burn, the temperature drop of the flue gas is large, and the one-time investment and operating costs are high

When using calcium-based SDA semi-dry desulfurization + dust removal + medium and low temperature SCR denitrification process, it occupies a large area and consumes a lot of energy

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