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Front biomass ultra-high-speed self-balancing gasifying co-combustion device and method for coal-fired boiler

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

Active Publication Date: 2016-08-24
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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  • Front biomass ultra-high-speed self-balancing gasifying co-combustion device and method for coal-fired boiler

Examples

Experimental program
Comparison scheme
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 are 5%, the bed material is quartz sand, the particle size is 1.2mm, and the biomass ultra-high speed is added through the inlet 104 with a pressure of -200Pa. Self-equilibrium gasification equipment 1, biomass ultra-high-speed self-equilibrium gasification equipment 1, the bottom cone speed is 3.5m / s, the temperature of the dense phase zone is 780°C, the temperature of the middle dilute phase zone is 825°C, and the temperature of the generated high-temperature gas is 790°C. After the cyclone separator 2 is dedusted, the gas passes through the gas heat exchanger 3 for heat exchange, and the temperature drops to 420°C. The high temperature gas blower 9 sends the cooled gas into the gas burner 501 in the furnace chamber of the boiler 5 for combustion. The combusted boiler exhaust gas is mixed into the return air with an oxygen content of 21% by the exhaust g...

Embodiment 2

[0061] The raw material is cotton stalk, the length is 5cm, the water content is 40%, the K and Na content in the biomass ash is 35%, the bed material is alumina pellets, the particle size is 3mm, and the biomass ultra-high-speed is added through the feeding port 104 with a pressure of 0Pa. Self-equilibrium gasification equipment 1, biomass ultra-high-speed self-equilibrium gasification equipment 1 bottom cone speed 7m / s, dense phase zone temperature 645 ℃, central dilute phase temperature 678 ℃, high temperature gas temperature 630 ℃, through the cyclone After the separator 2 is dedusted, the gas passes through the gas heat exchanger 3 for heat exchange, and the temperature drops to 400°C. The high temperature gas blower 9 sends the cooled gas into the gas burner 501 in the furnace chamber of the boiler 5 for combustion. The combusted boiler exhaust gas is mixed into the return air with an oxygen content of 1% through the exhaust gas pressurization mixing device 7, and is pas...

Embodiment 3

[0063] The raw material is rice husk, the moisture 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 at an ultra-high-speed self-balancing Gasification equipment 1, biomass ultra-high-speed self-equilibrium gasification equipment 1 The bottom cone speed is 4.5m / s, the temperature of the dense phase zone is 780°C, the temperature of the middle dilute phase zone is 795°C, and the temperature of the generated high-temperature gas is 755°C, which is separated by a cyclone. After the dedusting in the device 2, the gas is heated by the gas heat exchanger 3, and the temperature drops to 450 °C. The high temperature gas blower 9 sends the cooled gas into the gas burner 501 in the furnace chamber of the boiler 5 for combustion. The combusted boiler exhaust gas is mixed into the return air with an oxygen content of 7% through the exhaus...

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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-firing device and method for pre-coal-fired boilers. Background technique [0002] Biomass is a traditional renewable resource. my country's biomass energy resources are very rich, and the development of biomass power generation industry is promising. On the one hand, the sown area of ​​crops in my country is 1.8 billion mu, and the annual production is about 700 million tons. Except for the part 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, and the forest coverage rate is 18.21%. Every year, through normal shrub stubble rejuvenation, forest tending and thinning, fruit tree hedge trimming, and collecting forest logging, wood building, processing residues, etc. Obtained biomass resources of abo...

Claims

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Application Information

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Patent Type & Authority Applications(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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