Slag treatment system and method of biomass boiler

Abstract

The invention discloses a slag treatment system and a slag treatment method of a biomass boiler. The system comprises a slag groove, a slag conveyer and a reburning device. The reburning device is hermetically arranged between the slag groove and the slag conveyer and can move along a horizontal direction. The reburning device is controlled to be closed, the slag falls onto the reburning device through the slag groove so that the reburning of carbon in the slag is realized. Heat generated by burning of carbon in the slag returns to a hearth. The reburning device is controlled to be opened, and the slag falls onto the slag conveyer and is discharged. The method comprises the steps of: closing the reburning device so that the slag falls onto the reburning device through vibration of a fire grate, the fire grate stops vibrating, and heat generated by reburning of carbon in the slag returns to the hearth; opening the reburning device so that the slag falls onto the slag conveyer and is discharged; and repeating the steps to realize the reburning of carbon in the slag and recycling of the heat. According to the slag treatment system and the slag treatment method of the biomass boiler provided by the invention, heat of the slag is recovered and the boiler efficiency is improved through the reburning of unburned carbon in the slag by the reburning device.

Description

technical field [0001] The invention relates to the technical field of boiler slag treatment, in particular to a biomass boiler slag treatment system and a method thereof. Background technique [0002] With the rapid development of the national economy, more and more electricity is needed. At the same time, the country's environmental protection requirements for the power industry are also getting higher and higher, and the implementation of "energy saving and emission reduction" has been strengthened, prompting many power companies to use renewable energy for power generation. technology. Biomass energy is currently the most widely used renewable energy in the world, and its total consumption ranks fourth after coal, oil, and natural gas. It is also the only recyclable and renewable carbon source. As the number of biomass power plants increases, more and more ash wastes are generated from boilers, which seriously affects the quality of the environment. How to deal with th...

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Problems solved by technology

As the number of biomass power plants increases, so does the ash waste generated from boilers, which seriously affects the quality of the environment

How to deal with the mountains of ash in an environmentally friendly, reasonable and optimized manner, and solve a series of environmental problems such as the occupation of a large amount of cultivated land and the pollution of groundwater systems, has attracted more and more attention from the state and governments at all levels, and has restricted the production of The development of material energy industry

[0003] At present, the boilers of global biomass power plants have been using traditional slag discharge technologies such as scraper type slag remover and spiral slag remover for many years. The heat contained in the slag itself is completely lost in the cooling water, and the slag has high carbon content, poor activity, and low comprehensive utilization.

[0004] The main problems of using the scraper type slag extractor are: large water consumption, high power consumption, chain breakage, jamming may cause boiler shutdown, affecting stable operation of the boiler; loss of unburned carbon in the furnace bottom slag causes energy loss, slag The heat contained in the water itself is completely lost in the water; the radiation heat loss in the bottom area of ​​the boiler, and the steam generated by the high-temperature slag falling into the water will corrode the water wall of the boiler. Risk of injury (large coke blocks falling into water to cause water hammer steam explosion accident), low comprehensive utilization value of slag, etc.

At the same time, a large amount of air needs to be supplemented during the combustion process, and the requirements for boiler air distribution are relatively high, and it is difficult to ensure the full combustion of biomass fuel, so the amount of slag is large and the hardness is high

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