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
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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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