Biomass fuel boiler

Abstract

The invention discloses a biomass fuel boiler based on the original coal burning boiler. A primary air chamber, secondary air ports respectively equipped in a feed pipe and in a furnace cavity below the feed pipe, and a plurality of air ports equipped at the left and right sides of the furnace cavity and staggeredly arranged are connected with an air preheater, and a regulating baffle is respectively provided in each air ports. The invention realizes complete combustion of biomass fuel with suspension combustion as main combustion manner and grate firing as auxiliary combustion manner. As an improvement, the cross-sectional area of the combustion zone in the furnace cavity is larger than the burnout zone; a dregs condensing pipe equipped with a cooling water passage is provided at the inlet port of a first smoke flue; superheaters are disposed at different positions of the boiler in accordance with the type of biomass fuel; a vertical shaft smoke flue at tail portion is sequentially connected with a dust remover and an induced fan; and an adjacent furnace heating device is respectively equipped in the furnace cavity and the lower header tanks of the water-cooled wall of the first and second smoke flues. The invention can prevent high temperature corrosion, assure heat exchange efficiency and storage bin safety, shorten starting time, and prolong service life.

Description

technical field [0001] The invention relates to a boiler using biomass such as straw as fuel. Background technique [0002] According to statistics, as of the end of 2004, the total installed capacity of biomass fuel power generation represented by straw in the world has reached 39 million kilowatts, which can replace 70 million tons of standard coal, which is the sum of wind power, photovoltaic, geothermal and other renewable energy power generation. Traditional coal-fired boilers include drum, furnace, feed pipe, first flue, second flue, tail shaft flue, primary air chamber, secondary air supply device, water-cooled vibrating grate, superheater, province Coal burners, air preheaters, blowers, etc., cannot be applied to biomass fuels, because biomass fuels have a small specific gravity and large volume, and full combustion cannot be achieved when burning on the upper layer of the grate, and the furnace is under positive pressure, and the fuel entering the furnace It may be...

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Problems solved by technology

[0002] According to statistics, as of the end of 2004, the total installed capacity of biomass fuel power generation represented by straw in the world has reached 39 million kilowatts, which can replace 70 million tons of standard coal, which is the sum of wind power, photovoltaic, geothermal and other renewable energy power generation. Traditional coal-fired boilers include drum, furnace, feed pipe, first flue, second flue, tail shaft flue, primary air chamber, secondary air supply device, water-cooled vibrating grate, superheater, province Coal burners, air preheaters, blowers, etc., cannot be applied to biomass fuels, because biomass fuels have a small specific gravity and large volume, and full combustion cannot be achieved when burning on the upper layer of the grate, and the furnace is under positive pressure, and the fuel entering the furnace It may be blown into the silo above the feed pipe through the feed pipe, causing a fire; secondly, some biomass fuels have a high tar content, and the smoke generated is relatively viscous, which is easy to burn in high-temperature pipes (superheaters, etc.) ), corrodes the pipes and reduces the heat transfer efficiency, and the viscous flue gas is easy to form a net in the narrow flue, which affects the normal flow of the flue g

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