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Tangential firing system under air staged combustion technology

A combustion technology and tangential combustion technology, applied in the field of tangential combustion systems, can solve the problems of high temperature corrosion, easy slagging of water walls, etc. amount of effect

Active Publication Date: 2012-09-26
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide an air staged combustion tangential combustion system in order to overcome the deficiencies in the prior art that the water wall in the burner area is prone to slagging and high temperature corrosion under the boiler staged combustion technology

Method used

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  • Tangential firing system under air staged combustion technology
  • Tangential firing system under air staged combustion technology
  • Tangential firing system under air staged combustion technology

Examples

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Embodiment 1

[0028] Below to figure 2 , image 3 , Figure 5 , Figure 6 This embodiment will be described. figure 2 Shown is the airflow injected into the furnace by the combustion system and its direction. The mixed airflow 1 of primary air and pulverized coal is sprayed into the furnace along the direction of the diagonal of the furnace section or at a small angle to the diagonal, and the diagonal primary air and mixed airflow of pulverized coal are opposed to form a smaller tangent circle; offset The cyclone 2 forms a certain angle with the primary air and pulverized coal mixed airflow 1. In one embodiment, the angle is between 10° and 25°, and the offset cyclone air volume is about 10% to 70% of the total air volume entering the furnace . The offset cyclone 2 at the four corners forms a larger tangent circle. On the one hand, it can make the flow field of the entire boiler burn in a tangent circle. Prevent pulverized coal air flow from scouring the water wall; flanging air 3 i...

Embodiment 2

[0032] Below to figure 2 , Figure 4 , Figure 5 , Figure 6 This embodiment will be described. figure 2 The air flow injected into the furnace and its direction for the combustion system. The mixed airflow 1 of primary air and pulverized coal is sprayed into the furnace along the direction of the diagonal of the furnace section or at a small angle to the diagonal, and the diagonal primary air and mixed airflow of pulverized coal are opposed, or form a smaller tangential circle; Set the cyclone 2 to form a certain angle with the primary air and pulverized coal mixed airflow 1, the angle is between 10° and 25°, and the air volume is about 10% to 70% of the total air volume entering the furnace. The offset whirlwind at the four corners forms a larger tangential circle. On the one hand, it can make the flow field of the entire boiler burn in a tangential circle. The pulverized coal airflow scours the water wall; the flanging air 3 is blown into the furnace in the opposite ...

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Abstract

The invention discloses a tangential firing system under an air staged combustion technology, which comprises main burners. The main burners are diagonally arranged along the cross section of a hearth; primary air and pulverized coal mixed airflows which are diagonally arranged are oppositely sprayed to form a first tangent circle in the hearth; each main burner consists of a plurality of primary air nozzles and a plurality of secondary air nozzles; the primary air nozzles and the secondary air nozzles are arranged at intervals; and each secondary air nozzle comprises an offset cyclone forming nozzle, a folding air nozzle and a direct blown air nozzle. According to the tangential firing system provided by the invention, by the reasonable arrangement and distribution of each path of airflow, the adherence oxygen volume of a boiler can be improved and a torch is prevented from being adhered to the wall, so that the risks of slag formation on the water cooling wall of the boiler and high temperature corrosion to the boiler can be reduced.

Description

technical field [0001] The invention relates to a burner system, in particular to a tangential combustion system for preventing slagging and high-temperature corrosion under air classification technology. Background technique [0002] With the development of human industry, the demand for energy has become increasingly prominent. As the main equipment for thermal energy, people have increasingly high performance requirements for boilers. [0003] With the increasingly stringent national environmental protection standards, low NO x Combustion technology has been widely used in pulverized coal boilers. Furnace overall air classification technology is currently the most widely used and most mature mainstream low NO in pulverized coal boilers in the world x combustion technology. Furnace overall air staging technology is to divide the amount of air required for combustion into two or more stages and send it in batches. At present, some patents have described the overall air ...

Claims

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Application Information

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IPC IPC(8): F23C5/32F23C7/00
Inventor 肖琨张建文乌晓江张翔陈楠
Owner SHANGHAI BOILER WORKS
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