Large-scale biomass briquette fuel fixed bed gasification power generation system

Abstract

The invention discloses a large-scale biomass briquette fuel fixed-bed gasification power generation system, which includes a feeding device, a downdraft gasifier, a purification system and a gas generator set. The downdraft gasifier includes a furnace, and the furnace includes A cylindrical water interlayer, the top of the water interlayer is provided with a top cover, and the bottom of the water interlayer is connected with an ash bin. The upper part is provided with a fire grate; the top cover is provided with a material level power device, and the material level power device is connected with a fixed plate, and the fixed plate is fixedly connected with a distribution motor. The output shaft of the distribution motor extends downward into the top cover and its bottom A rake is provided; the feeding device is a feeding hoist, and the discharge pipe of the feeding hoist passes through the top cover and extends into the interior of the furnace. The invention is suitable for using biomass briquette fuel as a raw material, and the structure of the gasification furnace makes the diameter break through the limit of 2 meters in the past, which can ensure the continuous operation of the large gasifier, and the power generation power breaks through the limit of 1MW.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of biomass energy, in particular to a power generation system using biomass briquette fuel as energy. Background technique [0002] my country is a big agricultural country, and the output of crop straw is about 700 million tons per year, ranking first in the world. At present, the main uses of straw in my country are papermaking, feed, rural life energy (used as fuel), and some of them are used to return to the field to make fertilizer, and the rest of the straw is discarded or incinerated. It has become a "waste" that is "not very useful" but must be disposed of. During the summer harvest and autumn and winter, a large amount of wheat, corn and other straws are always burned in the field, producing a lot of thick smoke, which not only becomes the bottleneck of rural environmental protection It has even become the chief culprit of the urban environment, and has become a new sou...

AI Technical Summary

Problems solved by technology

[0007] In short, the existing biomass fixed bed gasification power generation system has the following defects: 1. The diameter of the gasifier in the system cannot be increased (within 2m), resulting in a power generation of less than 1MW when used for power generation

2. The tar impurity content in gas is high (can only be controlled at 50mg / m 3 the following)

3. The purification system is a wet purification system, and the sewage treatment is difficult. The purification water needs to be replaced regularly, and a large amount of waste water is discharged.

4. The oxygen content in the gas cannot be stably controlled within 1%, which cannot meet the requirements of using electrostatic coking equipment, and the purification effect is limited

5. The ash discharge mechanism in the existing gasifier needs to be shut down when the ash discharge mechanism is discharged

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