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A method for controlling the oxygen amount at the outlet of a w-type flame boiler economizer

A control method and outlet oxygen technology, applied in the direction of combustion method, combustion control, fuel supply adjustment, etc., can solve problems such as deviation of oxygen amount at the outlet of economizer, high concentration of nitrogen oxide emission, uneven combustion of furnace, etc. Achieve the effects of improving furnace combustion, increasing boiler efficiency, and reducing carbon content in fly ash

Active Publication Date: 2018-06-12
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen deviation at the outlet of the economizer is common in the operation of 300MW and 600MW W-flame boilers. Due to the deviation of oxygen, the furnace burns unevenly, the carbon content of fly ash is high, the efficiency of the boiler decreases, and the concentration of nitrogen oxides is high. Problems such as high ammonia injection volume seriously affect the economical efficiency of the unit

Method used

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  • A method for controlling the oxygen amount at the outlet of a w-type flame boiler economizer
  • A method for controlling the oxygen amount at the outlet of a w-type flame boiler economizer
  • A method for controlling the oxygen amount at the outlet of a w-type flame boiler economizer

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Embodiment 1

[0046] The coal mills specifically put into operation in this embodiment are B and D coal mills.

[0047] Such as figure 1 As shown, the specific steps of the oxygen control method at the outlet of the W-type flame boiler economizer of the present invention are as follows:

[0048] (1) Input coal type, start a coal mill and boiler;

[0049] (2) When the working load of the boiler reaches 70MW, an additional coal mill will be put into operation;

[0050](3) Adjust the average value of oxygen on both sides of the economizer outlet to 2.5%-3.5%;

[0051] (4) Adjust the total air volume of the boiler operation to 600t / h-650t / h;

[0052] (5) Adjust the opening of the SOFA overburning air to 10%, and the SOFA air up and down and horizontal swing angles are both ± 15°;

[0053] (6) Adjust the output of the two coal mills in operation to 25t / h-30t / h, and adjust the pressure of the main pipe of the primary bellows to 5kPa-6kPa;

[0054] (7) The method to adjust the deviation of t...

Embodiment 2

[0060] The specific coal mills put into operation in this embodiment are B and C coal mills, and A and D coal mills are reserved for standby.

[0061] The specific steps of the oxygen control method at the outlet of the W-type flame boiler economizer of the present invention are as follows:

[0062] (1)-(6) are the same as embodiment 1;

[0063] (7) The method to adjust the deviation of the primary wind speed of each powder pipe of the two coal mills in operation within 5% is: adjust the primary air of each powder pipe of B coal mill B1-B6 to adjust the shrinkage hole opening to 50%, 60% respectively %, 70%, 45%, 90% and 100%, adjust the opening degree of the primary air of each powder pipe of C pulverizer C1-C6 to be 55%, 65%, 90%, 75%, 60% and 80%;

[0064] (8) The specific method for adjusting the perimeter air opening of the air regulating disk on the arch to 15%-80% is as follows: Adjust the surrounding air opening of the air regulating disk of the burner corresponding ...

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Abstract

The invention discloses a method for controlling the oxygen content of an outlet of an economizer for a W-shaped flame boiler. The method comprises the following steps: 1, under the conditions that the operation oxygen content of the boiler, the combustion coal category, the grinding operation mode, the air distribution mode and the like are not changed, actually measuring the oxygen content of the outlet of the economizer, and analyzing a deviation of the oxygen content; 2, analyzing the cause of the deviation of the oxygen content; 3, performing heating state adjustment on primary air; 4, adjusting the air distribution mode; and 5, adjusting the deviation of the powder content. According to the control method, the deviation of the oxygen content of the outlet of the economizer can be adjusted, so that the deviation of the oxygen content of the outlet of the economizer can be small as far as possible during operation of the boiler, the combustion in a furnace hearth is more uniform, and the boiler efficiency is improved.

Description

technical field [0001] The invention relates to a method for controlling the oxygen quantity at the outlet of a boiler economizer, in particular to a method for controlling the oxygen quantity at the outlet of a W-shaped flame boiler economizer. Background technique [0002] At present, W-type flame combustion boilers in domestic coal-fired power generating units have good adaptability to low-volatile anthracite, and can make good use of anthracite for power generation. Oxygen deviation at the outlet of the economizer is common in the operation of 300MW and 600MW W-flame boilers. Due to the deviation of oxygen, the furnace burns unevenly, the carbon content of fly ash is high, the efficiency of the boiler decreases, and the concentration of nitrogen oxides is high. Problems such as high ammonia injection volume have seriously affected the economy of the unit. [0003] It is of great significance to study how to improve the oxygen deviation at the outlet of the W-type flame ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N1/02
CPCF23N1/027
Inventor 蔡培陈辉戴维葆黄启龙
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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