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Fired high-alkali coal slagging contamination prevention and control method based on boiler zone control

A technology of zone control and high alkali coal, which is applied in the control of combustion, combustion method, and the use of various fuels for combustion, etc., which can solve the problems of safe operation of unit equipment, pollution and ash accumulation, etc.

Pending Publication Date: 2020-07-24
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

However, the 300MW circulating fluidized bed boiler of Shenhua Midong Power Plant, which has better anti-slagging performance, also has serious contamination and as

Method used

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  • Fired high-alkali coal slagging contamination prevention and control method based on boiler zone control
  • Fired high-alkali coal slagging contamination prevention and control method based on boiler zone control
  • Fired high-alkali coal slagging contamination prevention and control method based on boiler zone control

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] During the combustion of pulverized coal, Na, NaOH, NaCl, Na2O, etc. are released from the coal and condense on the pipe wall, and react with the main elements silicon and aluminum compounds in the ash deposited on the pipe wall at 900-1200°C to form silicon-alumina Sodium acid (sodium feldspar), etc., and all melt at 1300 ° C. Albite itself has a low melting point (1100°C), and it can also dissolve high melting point substances such as quartz and mullite, which will form a large area of ​​molten slagging area in the furnace, thereby forming slagging. During the combustion of pulverized coal, Na2O condensed on the heating surface reacts with SO3 in the flue gas to form Na2SO4. Because Na2SO4 has a low melting point (884°C), it is very easy to adhere to the fine ash in the flue gas to form a fouling layer. Alkaline earth metals (CaO / MgO / Fe2O3) and SO3 in flue ga...

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Abstract

The invention discloses a fired high-alkali coal slagging contamination prevention and control method based on boiler zone control. The method includes the following steps that (1) the inside of a boiler is divided into a slagging zone, a severe contamination zone, a strong contamination zone and a general contamination zone according to the temperatures; (2) combustion chamber section thermal load and burner zone wall surface thermal load parameters are reduced, the slagging zone is controlled to be the zone from a burner to the over-fire air height, the range of the slagging zone is reduced,and the temperature window for alkali metal releasing is reduced; (3) combustion chamber volume thermal load parameters are reduced, the severe contamination zone is controlled to be the zone from over-fire air to a combustion chamber outlet, and a large quantity of alkali metal compounds deposit in the severe contamination zone; (4) through reasonable heated surface arrangement, the strong contamination zone is controlled in the horizontal flue zone, and the contamination probability of the heated surface of a horizontal flue is reduced; and (5) through reasonable heated surface arrangement,the general contamination zone is controlled in the tail flue zone. According to the method, the technical support is provided for design and safe operation of a newly-built fully-fired high-alkali coal unit boiler.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of slagging and pollution of pulverized coal boilers in power stations, and in particular relates to a method for preventing and controlling slagging and pollution of burning high-alkali coal based on zone control in the furnace. Background technique [0002] Coal reserves in Xinjiang are predicted to be 2.19 trillion tons, accounting for about 40% of the country's total. Among them, the Zhundong and Hami regions are dominated by high-alkaline coal, accounting for 45% of Xinjiang's reserves. energy base. High-alkali coal has low ignition temperature, high burnout rate, high combustion economy, and low pollutant emissions. It is an excellent power coal and meets my country's energy-saving and emission-reduction goals. However, compared with other severe slagging coals in China, high-alkali coal has Na 2 High content of O and CaO, SiO 2 and Al 2 o 3 Low content, high ash melting ...

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Application Information

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IPC IPC(8): F23C3/00F23C5/08F23J1/00F23J3/02F23J15/06F23M5/08F23N5/00
CPCF23C3/00F23C5/08F23J1/00F23J3/02F23J15/06F23M5/08F23N5/00
Inventor 姚伟张喜来王志超赵勇纲白杨
Owner XIAN THERMAL POWER RES INST CO LTD
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