Biomass gasification mixed-combustion system of coal-fired power station boiler

A technology for coal-fired power plants and power plant boilers, which is applied in the direction of granular/powdered fuel gasification, burners, and combined combustion mitigation, and can solve problems such as unoptimistic benefits, low degree of commercialization, and weak market competitiveness

Inactive Publication Date: 2013-05-01
HEFEI DEBO BIOENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is estimated that the biomass power generation project completed by 2020 can not only replace 7,500 tons of coal each year, but also reduce a large amount of pollution emissions. In addition, the sale of straw can also bring farmers 20 to 30 billion yuan in income. my country has abundant resources Biomass resources, biomass gasification and co-combustion of coal-fired boilers have great potential for power generation. Generally speaking, the industrialization of biomass power generation in my country is still in its infancy, with a low degree of commercialization, low profitability, and weak market competitiveness. The industrialization of biomass power generation has shown a good development trend

Method used

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  • Biomass gasification mixed-combustion system of coal-fired power station boiler

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Experimental program
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Effect test

Embodiment 1

[0022] Quartz sand with a particle size of 0-0.6 mm is added as an inert bed material from the bed material feeding hopper 7 to the fluidized bed gasifier 1 to improve the fluidization characteristics of the biomass. The temperature from the air preheater 5 Preheated air at 220°C with a pressure of 12kPa and superheated steam at a temperature of 300°C with a pressure of 12kPa from the utility boiler 4 as the gasification medium to ensure sufficient fluidization enters the gasifier 1 from the bottom of the fluidized bed gasifier 1 Inside, at a temperature of 750°C, react with biomass raw materials with a particle size of 0-50mm and a calorific value of 3200kcal / kg fed through the biomass feeding hopper 6 to generate high-temperature biomass gas with a calorific value of about 1150kcal / Nm 3 . Most of the dust in the gas is removed by the high-temperature cyclone separator 2. In order to prevent excessive biomass ash from entering the power plant boiler 4 and avoid alkali metal c...

Embodiment 2

[0024] The river sand material with a particle size of 0-0.8mm is added to the fluidized bed gasifier 1 as an inert bed material through the bed material feeding hopper 7 to improve the fluidization characteristics of the biomass. The temperature from the preheater 5 is Preheated air at 280°C and pressure of 18kPa and superheated steam from utility boiler 4 at temperature of 350°C and pressure of 18kPa enter from the bottom of fluidized bed gasifier 1 as the gasification medium to ensure sufficient fluidization. Under high temperature, it reacts with the biomass raw material with a particle size of 0-50mm and a calorific value of 3500kcal / kg fed through the biomass feeding hopper 6 to generate high-temperature biomass gas with a calorific value of about 1250kcal / Nm 3 . Most of the dust in the gas is removed by the high-temperature cyclone separator 2. In order to prevent too much biomass ash from entering the utility boiler 4 and avoid causing alkali metal corrosion on the hea...

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Abstract

The invention relates to a biomass gasification mixed-combustion system of a coal-fired power station boiler. Preheated air and superheated steam of the boiler are adopted as a gasifying agent together to react with biomass in a fluidized bed gasifier adding bed materials to generate high-temperature biomass gas, most of the dust in the gas is removed in the high-temperature environment, and the gas is fed into the power station boiler for mixed combustion. The biomass gasification mixed-combustion system realizes clean biomass gas and fire coal mixed-combustion, eliminates the influence of alkali metal in the biomass dust on the coal-fired power station boiler, and realizes the efficient utilization of biomass.

Description

technical field [0001] The invention relates to a biomass gasification co-combustion system for a coal-fired power station boiler, belonging to the field of biomass gasification. Background technique [0002] With the increasingly prominent global energy and environmental issues, the development of new energy sources has become an urgent task. Biomass energy is rich in resources, can be converted into clean fuel, is the only renewable energy that can be stored and transported, and is also the only renewable carbon source. It will play an important role in meeting future social energy needs and promoting sustainable social development. important role. [0003] There are many specific types of biomass, mainly referring to wood, crops (straw, rice straw, wheat straw, bean stalk, cotton stalk, chaff, etc.), weeds, algae, etc. my country's biomass energy is also extremely rich, and the biomass resources that can be developed into energy sources amount to more than 300 million t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/56F23D17/00
CPCY02P20/129Y02E20/18Y02E20/34
Inventor 张守军鲁万宝赵成武
Owner HEFEI DEBO BIOENERGY SCI & TECH
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