Co-combustion device and method for ultra-high-speed self-balanced gasification and co-combustion of biomass in front of coal-fired boiler

A coal-fired boiler, self-balancing technology, applied in combustion method, granular/powder fuel gasification, gasification process, etc., can solve problems such as long-term stable operation of the device, unstable biomass gasification, and blocking of feeding materials. , to achieve the effect of improving the adaptability of raw materials, avoiding tar precipitation, and enhancing adaptability

Active Publication Date: 2017-11-28
合肥德博电力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biomass gasification in my country mainly uses low moisture, high calorific value, high ash melting point, and good fluidity biomass (such as rice husk, wood chips, etc.) The device cannot run stably for a long time due to problems such as slagging and feeding jamming.

Method used

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  • Co-combustion device and method for ultra-high-speed self-balanced gasification and co-combustion of biomass in front of coal-fired boiler

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Experimental program
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Effect test

Embodiment 1

[0059] The raw material is twig wood, the length is 5cm, the water content is 25%, the K and Na content in the biomass ash is 5%, the bed material is quartz sand, and the particle size is 1.2mm. Self-balancing gasification equipment 1, biomass ultra-high-speed self-balancing gasification equipment 1 The bottom cone speed is 3.5m / s, the temperature in the dense phase zone is 780°C, the temperature in the middle dilute phase zone is 825°C, and the temperature of the high-temperature gas generated is 790°C. After the cyclone separator 2 removes dust, the gas passes through the gas heat exchanger 3 for heat exchange, and the temperature drops to 420°C. The high-temperature gas fan 9 sends the cooled gas into the gas burner 501 in the furnace of the boiler 5 for combustion. The combusted boiler tail gas is mixed into the return air with an oxygen content of 21% by the tail gas pressurization and air mixing equipment 7, and then passed into the air chamber 102 of the self-balancing ...

Embodiment 2

[0061] The raw material is cotton stalks with a length of 5cm and a water content of 40%. The K and Na contents in the biomass ash are 35%. The bed material is alumina balls with a particle size of 3mm. Self-balancing gasification equipment 1, biomass ultra-high-speed self-balancing gasification equipment 1 The bottom cone speed is 7m / s, the temperature in the dense phase area is 645°C, the temperature in the middle dilute phase area is 678°C, and the temperature of the high-temperature gas generated is 630°C. After the separator 2 removes dust, the gas is exchanged through the gas heat exchanger 3, and the temperature drops to 400°C. The high-temperature gas fan 9 sends the cooled gas into the gas burner 501 in the furnace of the boiler 5 for combustion. The combusted boiler exhaust gas is mixed into the return air with an oxygen content of 1% by the exhaust gas pressurization and air mixing equipment 7, and then passed into the air chamber 102 of the self-balancing feeder, a...

Embodiment 3

[0063] The raw material is rice husk, the water content is 12%, the K and Na content in the biomass ash is 6%, the bed material is alumina pellets, the particle size is 4mm, and the biomass is added through the feed port 104 with a pressure of -300Pa. Gasification equipment 1, biomass ultra-high-speed self-balanced gasification equipment 1 The speed of the bottom cone section of 1 is 4.5m / s, the temperature in the dense phase area is 780°C, the temperature in the middle dilute phase area is 795°C, and the temperature of the high-temperature gas generated is 755°C, which is separated by cyclone After the dust is removed by the device 2, the gas is exchanged through the gas heat exchanger 3, and the temperature drops to 450°C. The high-temperature gas fan 9 sends the cooled gas into the gas burner 501 in the furnace of the boiler 5 for combustion. The combusted boiler tail gas is mixed into the return air with an oxygen content of 7% by the tail gas pressurization and air mixing...

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Abstract

The invention belongs to the technical field of utilization of biomass, and discloses a front biomass ultra-high-speed self-balancing gasifying co-combustion device and method for a coal-fired boiler. Biomass ultra-high-speed self-balancing gasifying equipment is used for gasifying biomass, and after being cooled and pressurized, fuel gas is delivered into a hearth of the coal-fired boiler and then is combusted. A fuel gas cooling medium is steam which is extracted from a medium-pressure section in a turbine and the temperature of the steam is 400 DEG C, after heat is exchanged between the steam and the fuel gas, secondary heat exchange between the steam and air is implemented, and high-temperature air is produced and supplied for a gasifier. A biomass gasifying coupling large coal-fired power generation system is realized, biomass power generation parameters and efficiency are improved by a high-capacity and high-parameter turbine power generation system, the problem that an existing biomass direct-fired technology is small in power generation scale and low in efficiency is solved, the front biomass ultra-high-speed self-balancing gasifying co-combustion device and method for the coal-fired boiler are suitable for high-alkalinity and high-moisture biomass, and the utilization range of biomass is expanded.

Description

technical field [0001] The invention belongs to the technical field of biomass utilization, and in particular relates to an ultra-high-speed self-balanced gasification and co-combustion device and method for biomass in front of a coal-fired boiler. Background technique [0002] Biomass is a traditional renewable resource. my country is rich in biomass energy resources, and there is great potential for the development of biomass power generation industry. On the one hand, the sown area of ​​crops in my country is 1.8 billion mu, and the annual production of materials is about 700 million tons. Except that part is used for papermaking and livestock feed, the rest can be used as fuel. On the other hand, my country's existing forest area is about 175 million hectares, with a forest coverage rate of 18.21%. Every year, through normal shrub stubble and rejuvenation, forest tending and thinning, fruit tree hedge trimming, and collection of forest harvesting, timber, and processing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C1/12F23K5/00C10J3/56C10J3/84F01K17/00
CPCC10J3/56C10J3/84C10J2300/0916F01K17/00F23C1/12F23K5/002
Inventor 张守军张齐生范晓旭周建斌张守峰庄会永鲁万宝赵成武吴银龙李益瑞
Owner 合肥德博电力有限公司
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