High-moisture-content biomass fuel boiler

Abstract

The invention relates to a boiler, which is characterized in that high-moisture-content biomass fuels such as palm fruit shells, fibers, bran coats, bagasse and the like generate steam through a specific combustion method for electricity generation and steam supply. The boiler adopts a wind dispersal mode, and a layer combustion mode by using the suspension combustion in a furnace as a main means and using a rotating fire grate or a water cooling fixing fire grate as an auxiliary means is adopted. The boiler comprises main components such as a feeding machine, a spraying device, the fire grate, a multi-stage wind supply device, a diaphragm type water cooling wall hearth, a water cooling screen, an overheater, a water spraying temperature reducer, a coal economizer with fins and the like and is shown as Figure 1. In the boiler, the high-moisture-content biomass is pretreated and processed and is then directly dispersed by wind to the hearth by the variable-frequency speed-regulation feeding machine through high-pressure head wind, and medium and short fibers are rapid dried, fired and completely combusted in a high-temperature smoke gas environment in the furnace. Long fibers fall in the middle or back position of the fire grate, the fire grate rotates from the back end to the grate front, the detention time of the biomass fuels on the fire grate is effectively prolonged, the complete combustion is favorably realized, the probability of the coking on the fire grate is greatly reduced, and the operation reliability is improved.

Description

[0001] 1. Technical field: Biomass fiber combustion power generation technology 2. Background technology: [0002] Due to the high moisture content of palm fiber and fruit bunch shells (up to 60%, the moisture content is still about 50% after pressing and shredding), and the low calorific value (the calorific value is about 2100kcal / kg), in order to increase the output of palm oil, the planter In the process of planting palm trees, a large amount of potassium fertilizer was applied, which contains high potassium. Therefore, the compounds produced during the combustion process of palm fruit fibers and string shells are very easy to coke. After coking, it will affect the normal heat transfer of the boiler, thereby affecting the steam production of the boiler. The actual capacity of the boiler will be severely reduced. If no measures are taken, the boiler will run for half a year, and the boiler that produces 40 tons of steam per hour will reduce its steam production from 40 tons...

AI Technical Summary

Problems solved by technology

[0003] The technical solution of Germany, Denmark and Belgium is to make a fuss about the boiler grate, using water-cooled vibrating reciprocating grate, mainly burning fruit shells with high calorific value, so that there will be no coking on the grate, but only water-containing grates can be used. 40% biomass fuel, to use palm husk biomass fuel with a moisture content of 50%, diesel must be used to support combustion when starting the biomass boiler; and the price of this set of power generation equipment is extremely high. $3 million to pay for the grate

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