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Combustion optimization system and adjustment method for preventing high temperature corrosion of water wall

A technology of combustion optimization and adjustment method, applied in the combustion method, combustion chamber, control combustion and other directions, can solve the problems of uneven heating, affect the burning of pulverized coal, increase the swirl intensity, etc., and achieve the flue gas temperature field and smoke. The airflow field is evenly distributed, the swirl intensity is effectively matched, and the effect of strengthening the lateral mixing

Active Publication Date: 2018-10-19
GUODIAN SCI & TECH RES INST +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The effect of increasing the oxygen content in the near-wall area of ​​the water-cooled wall on both sides of the wall is not obvious
After a large number of tests and actual operation, it was found that the secondary air valve of the middle burner was closed to 15~20% in the test, and the secondary air valve of the burner close to the side wall was fully opened, and the oxygen content in the water-cooled wall area of ​​the two side walls near the wall increased slightly. , but in actual operation, if the opening of the secondary air door of the burner is adjusted too small, there will be safety hazards in operation, and if the opening of the secondary air door of the burner is adjusted too large, it will affect the ignition and burnout of coal powder. The effect of oxygen content in the near-wall area of ​​the side wall water wall is not obvious
[0009] (2) Air volume and swirl intensity cannot be effectively matched, which affects combustion efficiency and stability
When adjusting, the excessive opening of the damper close to the side wall burner can increase the air volume, but reduces the swirl strength, which is not conducive to the timely ignition of coal powder and affects the burnout of coal powder
If the burner damper in the middle area is too small, the air volume will be reduced, but the swirl intensity will be increased, which will lead to problems such as early ignition, nozzle burning, and wall painting.
[0010] (3) The thermal deviation is large, the amount of desuperheating water is high, and the economic efficiency of the unit is reduced
The horizontal mixing effect in the opposite swirl combustion boiler is extremely poor. The use of non-uniform air distribution combustion will inevitably lead to uneven distribution of the temperature field and flue gas flow field in the furnace. This unevenness will continue from the main combustion area to the coal-saving area. The outlet of the device, which leads to uneven heating of the heating surfaces such as screen pass, high pass, high pass, etc., and there is a thermal deviation, which in turn leads to an increase in the flow rate of desuperheating water and a decrease in the economical efficiency of the unit

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  • Combustion optimization system and adjustment method for preventing high temperature corrosion of water wall
  • Combustion optimization system and adjustment method for preventing high temperature corrosion of water wall
  • Combustion optimization system and adjustment method for preventing high temperature corrosion of water wall

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] Such as figure 1 , figure 2 As shown, the object of combustion optimization in this embodiment is a 660MW ultra-supercritical counter-swirl combustion boiler, which includes a furnace 1, a burner 11, a panel superheater 5, a high-temperature superheater 6, a high-temperature Reheater 7, low-temperature superheater 8, low-temperature reheater 9, economizer 10, secondary air wind box 12, overfire air nozzle 13, coal mill 14, primary air pulverized coal pipeline 15. The furnace 1 is composed of the front wall, the rear wall and the water-cooled walls on both sides. The upper, middle and lower layers of burners are respectively arranged on the front and rear walls. Each layer has 6 burners, a total of 36 burners. Each layer burns Devices 11 are co-located in a secondary air wind box 12. The boiler is equipped with 6 coal mills 14, and each coal mill supplies p...

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Abstract

The invention provides a combustion optimization system and adjustment method for preventing water wall high-temperature corrosion. The combustion optimization system comprises air and pulverized coal adjustment devices, secondary air distribution adjustment devices, two water wall near wall region smoke component measuring devices, a plurality of auxiliary over fire air nozzles, a temperature field measuring device and a coal economizer outlet smoke oxygen content field measuring device. A first air and pulverized coal pipeline corresponding to each combustor is provided with the corresponding air and pulverized coal adjustment device. Each secondary air box is internally provided with the corresponding secondary air distribution adjustment device. The two water wall near wall region smoke component measuring devices are separately mounted on the water wall on the two sides of a boiler. The multiple auxiliary over fire air nozzles are separately arranged below over fire air nozzles. The temperature field measuring device is arranged on the portion, below a platen overheater, in a hearth. The coal economizer outlet smoke oxygen content field measuring device is arranged at a coal economizer outlet flue. By adoption of the combustion optimization system, high-temperature corrosion to the water wall of the opposite cyclone combustion boiler can be effectively relieved.

Description

technical field [0001] The invention belongs to the field of thermal power generation equipment, and in particular relates to a combustion optimization adjustment method and system capable of effectively preventing high-temperature corrosion of the water wall of a counter-swirl combustion boiler on the front and rear walls, and is especially suitable for a coal-fired generating set using a counter-swirl combustion boiler. Background technique [0002] As one of the three main combustion methods of power plant boilers, the front and rear wall-contrasting swirling combustion boilers have become one of the main combustion methods used by supercritical and ultra-supercritical boilers in China due to their advantages in combustion equipment and heating surface layout. It occupies a large share in the thermal power units in service. In order to achieve efficient, economical and environmentally friendly operation, this type of furnace usually uses air staged combustion + low nitrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00F23N5/00F23M5/08F23L9/00F22B35/00
CPCF22B35/00F23C7/00F23L9/00F23M5/08F23N5/003
Inventor 陈国庆刘建民李永生黄启龙刘铭媛时伟孙俊威
Owner GUODIAN SCI & TECH RES INST
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