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Primary-secondary air coupling jet system and operation method thereof

A technology of a jet system and an operating method, which is applied in the direction of combustion method, air supply adjustment, combustion air/fuel supply, etc., can solve the problems of increased emission concentration and high furnace temperature, achieve improved fuel burnout performance, and reduce NOx emissions Concentration, the effect of reducing the amount of combustion air

Active Publication Date: 2020-04-07
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the enrichment of fuel in the main burner area, the furnace temperature is very high. With the further increase of oxygen content, NO x The emission concentration increased significantly, which became a difficult control point for the low-load operation of the unit

Method used

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  • Primary-secondary air coupling jet system and operation method thereof
  • Primary-secondary air coupling jet system and operation method thereof
  • Primary-secondary air coupling jet system and operation method thereof

Examples

Experimental program
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Embodiment 1

[0031] This embodiment provides a secondary air coupling jet system, such as Figure 1-2 As shown, it includes primary air main pipe 1, primary air branch pipe 2, direct current jet pipe 3, swirl jet pipe 4, direct current secondary air adjustment sleeve 5, swirl air regulating disc 6, secondary air box 7 and direct current primary Air regulating valve 8.

[0032] The primary air main pipe 1 is heated by primary air, and the primary air main pipe 1 is arranged along the furnace.

[0033] One end of the primary air branch pipe 2 is connected to the primary air main pipe 1, and the other end is connected to the direct current jet pipe 3; a direct current primary air regulating valve 8 is arranged on it.

[0034] Described direct current jet pipe 3, one end that is connected with direct current jet pipe 3 is direct current primary air inlet; A Pitot tube 14 and a temperature sensor 15 are installed inside the outlet 13 of the jet tube.

[0035] Said swirl jet pipe 4, one end c...

Embodiment 2

[0041] This embodiment provides the operation method of the primary-secondary air coupled jet system described in Embodiment 1, which monitors the DC jet velocity inside the outlet 13 of the DC jet tube online, and adopts different operating methods according to the magnitude of the DC jet velocity.

[0042] Such as figure 1 As shown, when the unit is running under high load conditions, the pressure of the secondary air box is high, and the DC jet velocity of the secondary air entering the DC jet pipe 3 through the DC secondary air inlet 9 is higher than the empirical airflow velocity. At this time, the DC primary air adjustment The valve 8 does not need to be opened, the direct current secondary air regulating sleeve 5 and the swirl air regulating disk 6 maintain proper openings, and the secondary air is sprayed into the furnace from the direct current jet tube 3 and the swirl jet tube 4 respectively.

[0043] Such as figure 2 As shown, when the load of the unit decreases, ...

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Abstract

The invention discloses a primary-secondary air coupling jet system and an operation method thereof. The NOx emission concentration of a thermal power generating unit is difficult to control under a low-load working condition. The primary-secondary air coupling jet flow system comprises a primary air main pipe, a primary air branch pipe, a direct flow jet pipe, a rotational flow jet pipe, a directflow secondary air adjusting sleeve, a rotational flow air adjusting disc and a secondary air box; the direct flow jet speed of the inner side of the outlet of the direct flow jet pipe is monitored on line; when the direct flow jet speed is lower than experience air flow speed, coupling adjustment is conducted on a direct flow primary air adjusting valve and a direct flow secondary air adjustingsleeve by means of the operation method, so that the jet flow of the jet flow system is transited from pure secondary air jet flow to primary-secondary air coupling jet flow; and therefore, the air flow pressure and jet flow speed of the jet flow system are improved, over fire air jet flow has stronger penetrating power and a stronger entrainment effect in a hearth, the overfire performance of fuel at an SOFA nozzle area is improved, the combustion air amount of a main combustor area is reduced, and the NOx emission concentration is reduced.

Description

technical field [0001] The invention belongs to the technical field of boiler pollutant emission control, in particular to a primary and secondary air coupled jet system and an operating method thereof. Background technique [0002] Staged air supply is a simple and effective way to reduce NO x Most of the burners of large-scale thermal power units adopt the method of graded air supply. The air required for combustion is sent into the furnace in stages through multiple burner nozzles, and the part of the air that is sent into the furnace at the final stage of fuel combustion is called separated overfired air (SOFA for short). When the incompletely combusted fuel passes through the SOFA nozzle area, it is mixed with the secondary air sent into the SOFA nozzle and further combusted. [0003] Under high-load conditions, SOFA has high pressure, high speed, strong rigidity, long penetration distance in the furnace, and strong smoke extraction ability, which can give full play t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/02F23L1/00F23L9/00F23N3/00
CPCF23C7/02F23L1/00F23L9/00F23N3/00
Inventor 吕洪坤张晓龙应明良胡建根
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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