Flue gas desulfurization, denitrification and dust removal system for biomass circulating fluidized bed boiler

Abstract

The intention discloses a flue gas desulfurization, denitrification and dust removal system of a biomass circulating fluidized bed boiler, and mainly relates to the technical field of environmental protection equipment. An ammonia water storage tank and a demineralized water tank are connected with a static mixer which is connected to a microwave turbulent flow spray gun through an ammonia water distribution module; wherein a compressed air storage tank is connected with the microwave turbulent flow spray gun through a compressed air distribution module and a cooling air distribution module respectively, the microwave turbulent flow spray gun is arranged in an inlet flue of a cyclone separator and provided with a plurality of nozzles arranged along the flow direction of flue gas, an outletflue of the boiler is connected with a dust removal device, and the flue gas subjected to dust removal enters a desulfurization device, wherein a spraying layer, a rotor turbulence high-efficiency dust and mist removing device and a mist eliminator are sequentially arranged in the desulfurization tower body from bottom to top, the rotor turbulence high-efficiency dust and mist removing device inthe desulfurization device comprises a rotor turbulence module, the rotor turbulence module is divided into an upper part and a lower part, the upper part is provided with a filler ball, and the lowerpart is provided with a flow guide device to enhance flue gas mixing and increase flue gas swirl efficiency.

Description

Technical field [0001] The present invention mainly relates to the technical field of environmental protection equipment, in particular to a biomass circulating fluidized bed boiler flue gas desulfurization, denitrification and dust removal system. Background technique [0002] On June 27, 2018, the State Council issued the "Three-Year Action Plan to Win the Blue Sky Defense War", which pointed out that biomass energy and geothermal energy should be developed in accordance with local conditions. Where resources are available, encourage the development of county-level biomass cogeneration, biomass briquette boilers and bio-natural gas. By 2020, the comprehensive utilization rate of straw in the country will reach 85%. The state encourages the application of biomass energy boilers. Many provinces and cities also allow the use of biomass power boilers, because such boilers can become the best biomass energy sources such as straw and rice husk. place. Biomass fuel boilers are one o...

AI Technical Summary

Problems solved by technology

However, in engineering practice, the desulfurization efficiency of baking soda dry method is low, and the desulfurization efficiency is greatly affected by the change of flue gas temperature and working conditions. It was originally applicable when ultra-low emissions were not implemented. Now, as the society pays more and more attention to environmental protection, biomass The ultra-low emission of boiler flue gas has been promoted and implemented nationwide, and dry desulfurization cannot guarantee stable compliance

In addition, biomass boilers have the characteristics of complex fuel types, large boiler load fluctuations, and unstable combustion, which can easily cause high fly ash content and high alkali metal content in boiler flue gas. SCR denitrification is prone to catalyst poisoning, denitrification device blockage and corrosion, etc. However, the traditional SNCR denitrification process generally has a denitrification efficiency of 50%-60%, which is difficult to meet the ultra-low emission standards required by the current Environmental Protection Agency.

Dust removal only adopts pre-dust removal + bag dust removal process to ensure that the dust emission reaches 10mg / Nm3 by reducing the filtration wind speed, but it is difficult to achieve the current environmental protection requirement of 5mg / Nm3

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