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Method for promoting stable burning of biomass fuel and used for burning of fluidized bed

A biomass fuel and fluidized bed technology, which is applied to fluidized bed combustion equipment, combustion methods, and fuels burned in a molten state, can solve problems such as clogging and coking at the boiler tail.

Inactive Publication Date: 2018-11-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method provided by the present invention has high stability of biomass fluidized combustion, and by selecting a regenerator that has been mixed and fluidized with biomass fuel, it can solve the problem of the boiler tail (before the slag discharge port and the Coking and blockage between biomass fuel inlets)

Method used

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  • Method for promoting stable burning of biomass fuel and used for burning of fluidized bed

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Experimental program
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Effect test

Embodiment 1

[0026] A rated 75t / h steam boiler, rated steam pressure 3.82Mpa, rated steam temperature 450°C, feed water temperature 150°C, primary air preheating temperature 150°C, biomass fuel 50% wheat straw + 50 rice straw, water content 15 %, without granulation, the fuel length is not greater than 10mm. Use ceramsite as heat storage body. After the ceramsite is broken, select particles with a particle size of 0-1.5mm and spread them on the air distribution board in the furnace with a thickness of 500mm. Ignite, control the temperature of the bed material, prevent local overheating, and control the temperature of the air chamber within 800 °C. Start the screw feeder to feed, put in fuel, and feed with the rated load fuel amount of 17t / h. The boiler runs smoothly, the combustion in the dense phase area is stable, the mixed combustion effect of fuel and heat storage body is good, and the thermal efficiency of the boiler is 91%.

Embodiment 2

[0028] One rated 75t / h steam boiler, rated steam pressure 3.82Mpa, rated steam temperature 450°C, feed water temperature 150°C, primary air preheating temperature 150°C, biomass fuel 50% wheat straw + 50 rice straw, water content 10 %, the fuel length is not greater than 10mm. Use ceramsite as heat storage body. The average particle size of ceramsite is 15mm, and the bulk density is 600Kg / m 3 , The regenerator is laid flat on the air distribution plate in the furnace, with a thickness of 600mm. Ignite, control the temperature of the bed material, prevent local overheating, and control the temperature of the air chamber within 800 °C. Start the screw feeder to feed, put in fuel, and feed with the rated load fuel amount of 17t / h. The boiler operates stably, the dense phase zone burns stably, the mixed combustion effect of fuel and heat storage body is good, and the thermal efficiency of the boiler is over 90%.

Embodiment 3

[0030] A rated 75t / h steam boiler, rated steam pressure 3.82Mpa, rated steam temperature 450°C, feed water temperature 150°C, primary air preheating temperature 150°C, biomass fuel is 50% wheat straw + 50 rice straw, granulated, Diameter 6~12mm, length 20~40mm, bulk density 850kg / m 3 . Use ceramsite as heat storage body. The average particle size of ceramsite is not more than 20mm, and the bulk density is the same as that of fuel, which is 850Kg / m 3 , The regenerator is laid flat on the air distribution plate in the furnace, with a thickness of 700mm. Ignite, control the temperature of the bed material, prevent local overheating, and control the temperature of the air chamber within 800 °C. Start the screw feeder to feed, put in fuel, and feed with the rated load fuel amount of 17t / h. The boiler runs smoothly, the combustion in the dense phase zone is stable, the mixed combustion effect of the fuel and the heat storage body is good, and the thermal efficiency of the boiler...

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Abstract

In biomass fluidized burning, a heat storage body needs to be added because the ash content of the biomass fuel is low, and the burnout residue is not enough to form a bed material. The fluidized windis difficult to control, and the burning is unstable due to the fact that accumulation density of a current heat storage body is far from that of the biomass, the back end equipment of a boiler is caused to be sticky to dust and worn, or the rear of the boiler is clogged and coking. According to a method for full burning of the biomass fluidization, by using an inorganic porous and lightweight natural or man-made materials resistant to high temperature as the heat storage body, the accumulation density of the heat storage body is 200-1500 Kg / m3, similar to the biomass raw materials, the heatstorage body is laid on a furnace wind arraying plate, through the air blowing of an air blower, the fluidized and stable burning with the biomass is achieved, and the problems that dust sticking of awater flow bundle, a superheater, an economizer, an air preheater due to the biomass fuel blended within the smoke as well as the blockage and coking caused by the local high temperature at the bottom of the boiler can be avoided.

Description

technical field [0001] The invention relates to the technical field of energy conversion, in particular to a method for realizing the full combustion of biomass in the process of biomass combustion in a fluidized state. Background technique [0002] Compared with other combustion technologies, circulating fluidized bed combustion technology has the characteristics of high combustion efficiency, easy control of harmful gas emissions, and large heat capacity. Moreover, it has low requirements for fuel, and some inferior fuels with high water content, low combustible content and low calorific value have good adaptability. Therefore, this combustion technology is currently the preferred technology for large-scale and efficient utilization of biomass waste. In fluidized combustion, the bed material has a high heat capacity, which can provide sufficient preheating and drying for biomass waste, and can still burn stably for biomass with a moisture content of 50%. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/26
CPCF23C10/10F23C10/26
Inventor 李益张奎张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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