Compound biomass clean and efficient combustion system

A combustion system and biomass technology, applied in combustion chambers, combustion methods, combustion equipment, etc., can solve the problems of high mixing conditions, poor adaptability of biomass fuels, and restrictions on the extensive and effective utilization of biomass energy, and achieve guaranteed Effects of burnout and control of NOx, improvement of flue gas mixing ability, and avoidance of local high oxygen concentration

Active Publication Date: 2017-05-31
SHANGHAI JIAO TONG UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The layer-fired boiler is the most widely used and produced boiler product in China. It is gradually applied to the combustion of biomass on the basis of relatively mature coal-fired design methods, but its current level limits the use of biomass energy. Extensive and effective use, mainly manifested in: the market and regulations put forward higher requirements for various indicators of boilers, but the existing design force lacks sufficient understanding and response to the combustion and emission characteristics of biomass fuels
The volatile content of biomass fuel is high, most of which exceed 70%. The proportion of combustible gas in the furnace is high, and the requirements for mixing conditions in the furnace are high. Most of the biomass combustion rate is higher than that of coal. New design m

Method used

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  • Compound biomass clean and efficient combustion system

Examples

Experimental program
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Effect test

Example Embodiment

[0027] Example 1

[0028] Such as figure 1 As shown, a composite biomass clean and efficient combustion system includes a furnace and a grate 1 arranged at the bottom of the furnace. The furnace is provided with a furnace arch that forms a zigzag flue. The furnace arch includes a zigzag flue that is staggered The front arch 4, the rear arch 3 and the folded flame arch 6. The system also includes a flue gas recirculation unit, a secondary air unit, and an SNCR unit. The flue gas recirculation unit includes a gas recirculation unit located in the middle of the grate 1 on the lower side wall of the furnace The flue gas recirculation duct 2 above the section. The secondary air unit includes secondary air ducts arranged on the side wall of the furnace according to different height positions. The SNCR unit includes SNCR nozzles 8 arranged on the upper side wall of the furnace. The flue gas The recirculation air pipe 2, the secondary air pipe and the SNCR nozzle 8 all extend through th...

Example Embodiment

[0033] Example 2

[0034] In this embodiment, the rear arch 3 covers the 0.7 area behind the grate 1, the height of the front arch arch out point 10 is 1.8 times the height of the rear arch arch out point 11, and the height of the flame-folding arch arch out point 12 is the height of the rear arch arch out point 11 2.8 times as much as in Example 1. The rest is the same as in Example 1.

Example Embodiment

[0035] Example 3

[0036] In this embodiment, the rear arch 3 covers the 0.8 area behind the grate 1, the height of the front arch arch out point 10 is 2.2 times the height of the rear arch arch out point 11, and the height of the flame-folding arch arch out point 12 is the height of the rear arch arch out point 11 3.2 times of, the rest is the same as in Example 1.

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Abstract

The invention relates to a compound biomass clean and efficient combustion system which comprises a hearth and a grate arranged at the bottom of the hearth. A boiler arch is arranged in the hearth and comprises a front arch body, a rear arch body and a flame folding arch body, all of which are arranged in a staggered manner to form a zigzag-shaped flue. The system further comprises a flue gas recirculation unit, a secondary air unit and an SNCR unit. The flue gas recirculation unit comprises a flue gas recirculation air pipe which is arranged at the position, above a middle section of the grate, on the side wall of the lower portion of the hearth. The secondary air unit comprises secondary air pipes which are arranged on the side wall of the hearth in a classified manner according to different height positions. The SNCR unit comprises an SNCR spraying opening formed in the side wall of the upper portion of the hearth, and the flue gas recirculation air pipe, the secondary air pipes and the SNCR spraying opening penetrate the side wall of the hearth and stretch in the hearth. Compared with the prior art, the problems that a biomass layer combustion boiler is high in air excess coefficient, incomplete in combustion, low in combustion efficiency, high in NOx emission concentration and the like are solved effectively.

Description

technical field [0001] The invention relates to a biomass combustion system, in particular to a composite biomass clean and efficient combustion system. Background technique [0002] With the consumption of fossil energy, the adjustment of energy structure and the needs of environmental governance in China, biomass energy has developed rapidly due to its renewability, low pollution and the need for proper disposal of agricultural and forestry waste itself. The most common form and the most widely used range, there are a variety of biomass energy utilization furnace types, structures and auxiliary equipment. [0003] The layer-fired boiler is the most widely used and produced boiler product in China. It is gradually applied to the combustion of biomass on the basis of relatively mature coal-fired design methods, but its current level limits the use of biomass energy. Extensive and effective use is mainly manifested in: the market and regulations put forward higher requiremen...

Claims

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Application Information

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IPC IPC(8): F23J15/00F23L9/00F23M5/06
CPCF23J15/006F23L9/00F23M5/06
Inventor 罗永浩邓睿渠曹阳张敏
Owner SHANGHAI JIAO TONG UNIV
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