A pulverized coal boiler direct-fired biomass drying system and drying method

Abstract

The invention relates to a pulverized coal boiler direct-fired biomass drying system and drying method. The technical solution is to include an SCR inlet flue, an SCR reactor, an SCR outlet flue, an induced draft fan inlet flue, and an induced draft fan outlet flue connected in sequence. Road, the pulverized coal boiler direct-fired biomass drying system also includes a conveyor belt for feeding the biomass into the coal mill inlet for crushing and a drying system for drying the biomass on the conveyor belt. The conveyor belt will dry the biomass The biomass is sent to the coal mill for grinding, and sent to the boiler together with the pulverized coal for suspension combustion. After drying, the biomass changes the fibrous structure of the biomass, so that the changed biomass can be ground by the existing coal mill. After this drying After the process, the grinding characteristics of biomass fuel are close to that of raw coal, and it can be ground finely enough. After the biomass is ground to powder, the powder pipe and burner of the existing pulverization system can be used to achieve mixed suspension combustion, which solves the problem of The large-scale blending problem of biomass direct combustion on pulverized coal furnace.

Description

technical field [0001] The invention belongs to the technical field of biomass utilization, in particular to a drying system and drying method for direct combustion of biomass in a pulverized coal boiler. Background technique [0002] The 21st Conference of the Parties to the United Nations Framework Convention on Climate Change and the 11th Conference of the Parties to the Kyoto Protocol opened in Paris, France. China stated that carbon dioxide emissions will peak around 2030, and strive to achieve the goal of fully neutralizing carbon dioxide by 2060. So far, at the end of 2020, China's major energy central enterprises have formally put forward the clear requirements of "carbon peak" and "carbon neutrality". [0003] Biomass blending is an effective way and an important means to reduce carbon dioxide emissions. Biomass mainly refers to lignocellulose (referred to as lignin) such as straws and trees other than grain and fruit in the process of agricultural and forestry pro...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a drying system and drying method for direct combustion of biomass in a pulverized coal boiler, which can effectively solve the problem of utilizing the pulverizing pipe and burner of the existing pulverizing system, and solve the problem of biomass burning in pulverized coal. The problem of large-scale blending of furnace direct combustion

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