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. According to the technical scheme, the pulverized coal fired boiler direct-fired biomass drying system comprises an SCR inlet flue, an SCR reactor, an SCR outlet flue, an induced draft fan inlet flue and an induced draft fan outlet flue which are sequentially connected. The pulverized coal boiler direct-fired biomass drying system further comprises a conveying belt used for conveying biomass into an inlet of a coal mill to be smashed and a drying system used for drying the biomass on the conveying belt, the conveying belt conveys the dried biomass into the coal mill to be ground, the dried biomass and pulverized coal are conveyed into a boiler together to be subjected to suspension combustion, the fibrous structure of the dried biomass is changed, the changed biomass can be ground by an existing coal mill, the grinding characteristic of biomass fuel is close to that of raw coal after the drying process, the biomass fuel can be ground to be fine enough, and after the biomass is ground into powder, through a powder pipe and a combustor of an existing coal pulverizing system, mixed suspension combustion can be achieved, and the large-proportion mixing problem of direct combustion of the biomass on a pulverized coal furnace is solved.

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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