Buried pipe rotational flow jetting-blowing device in right-above secondary air furnace of CFB boiler
A technology of blowing device and secondary air, which is applied in the field of power engineering, can solve the problems of adding a carbon-containing army of fly ash, etc., and achieve the effects of reducing initial investment and operating power consumption, improving quality, and reducing emissions
Pending Publication Date: 2019-12-06
NORTH CHINA POWER ENG
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Problems solved by technology
After the larger particles separated by the separator are returned to the furnace by the feeder, after being burned and ground for many times, some of them will not be able to return to the furnace in the end, and will join the army of fly ash carbon.
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Embodiment Construction
[0030] The invention protects a swirl blowing device for a buried pipe in a secondary blast furnace directly above a CFB boiler.
[0031] Such as figure 1 As shown, it comprises a plurality of spray air main pipes 2. The blast main pipe 2 is inserted into the furnace of the CFB boiler in a cantilever shape. A plurality of blowing air main pipes 2 are all connected to the air supply main pipe 1 connected to the secondary hot air passage.
[0032] Such as Figure 5 As shown, the position of the blast main pipe 2 is arranged directly above the coal feeding port 5 . The opening in the lower half of the wall of the blast main pipe 2, that is, the direction of the opening is the windward side, and the opening has a built-in cyclone for the secondary wind swirl blowing. The opening ratio, hole shape, and aperture of the opening are Set according to the actual situation.
[0033] Such as figure 2 and image 3 As shown, the windward side of the blowing main pipe 2 is provided w...
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The invention provides a buried pipe rotational flow jetting-blowing device in a right-above secondary air furnace of a CFB boiler. The buried pipe rotational flow jetting-blowing device comprises a plurality of cantilever-shaped air jetting main pipes inserted into a furnace of the CFB boiler and all arranged right above a coal feeding opening, a plurality of opening holes are formed in the lowerhalf circumference of the pipe walls of the air jetting main pipes for downward rotational flow air-jetting, all the air jetting main pipes are connected to an air supplying mother pipe, abrasion-resistant air cavity structures are arranged on the windward sides of the air jetting main pipes and are ring membrane air cavities formed by the air cavity walls on the windward sides of the air jettingmain pipes in a surrounded mode, the air supplying mother pipe also provides secondary air for the ring membrane air cavities to form abrasion-resistant membrane state air, and an air supplying mainpipe can adopt an oval pipeline with a horizontal short shaft or an eccentric variable cross-section pipeline with the horizontal bottom line. According to the buried pipe rotational flow jetting-blowing device, mass transfer between the secondary air and a coal flow entering the boiler can be reinforced, and thus the combustion efficiency of the CFB boiler is effectively improved.
Description
technical field [0001] The invention relates to a CFB boiler and belongs to the field of power engineering. Background technique [0002] One of the main disadvantages of CFB boilers compared with pulverized coal boilers is the low boiler efficiency, and the disadvantage of mechanical incomplete combustion heat loss q4 being greater than that of pulverized coal boilers is particularly prominent. [0003] The current CFB boiler is equipped with upper and lower secondary air layers on both sides of the coal inlet, and the air-coal mass transfer effect is poor. There are "oxygen-rich areas" and "coal-rich areas", "oxygen-rich" and "fuel-rich" (including Gas combustibles and combustible carbon) cannot achieve the best combination due to insufficient lateral movement ability, so they can only go up all the way in their respective areas until the furnace exit, especially after meeting in the cyclone separator, the combustion reaction is partially completed, that is, the CFB boiler...
Claims
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IPC IPC(8): F23C10/20
CPCF23C10/20
Inventor 李仁
Owner NORTH CHINA POWER ENG