The method of adjusting the cross-sectional area of the nozzle to keep the wind speed constant
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A cross-sectional area and nozzle technology, which is applied in the field of power plant boilers and boilers, can solve the problems of different loads, large ash content, low calorific value of thermal coal chemical coal, etc., and achieve the effect of increasing contact opportunities, good combustion state, and ensuring combustion state
Inactive Publication Date: 2017-02-15
中节环(北京)环境科技股份有限公司
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Abstract
Description
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Problems solved by technology
[0004] my country's power plant boilers mainly burn steam coal, which has a lower calorific value, higher ash content, and unstable volatile matter than chemical coal; at the same time, most power plants burn automobile coal as the main type of coal, with many coal sources and complex coal types; and power plants Coal blending equipment is relatively simple, and it is impossible to guarantee the stability of industrial analysis of coal quality after blending two or more coal types. The above reasons lead to large deviations between the actual coal types burned by power plant boilers in various regions and the ideal coal types designed for boilers
In this way, the load is different, the air volume is different, the outlet cross-sectional area of the nozzle remains unchanged, and the speed of the outlet air cannot meet the requirements of the design value.
This kind of extensive burner nozzle design, the outlet area of the nozzle is constant, the air volume is different under different loads, and the air volume of different coal types is different. The nozzle outlet area cannot be adjusted, and the nozzle outlet flow rate cannot be guaranteed.
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specific Embodiment approach 1
[0069] The present invention will be described in detail below in conjunction with the accompanying drawings. As shown in the accompanying drawings:
[0070] A device for adjusting the cross-sectional area of the nozzle to ensure constant wind speed, which consists of primary fan 1, A valve 2, preheater A3, coal mill 4, burner A5, secondary fan 6, B valve 7, preheater B8, Composed of burner B9, furnace 10, preheater C11, dust collector 12, C valve 13, fan 14, and chimney 15;
[0071] The burner B9 is selected from a blunt telescopic burner, a swing burner with an upper and lower nozzle, and a swing burner with blades;
[0072] The blunt telescopic burner is composed of a frame body 91, a spout 92, a support 93, a pull rod 94, and a blunt body 95;
[0073] The upper and lower spout swing type burner consists of an outer frame 901, an upper spout 902, a lower spout 903, a rotating shaft 904, an upper shaft 905, a lower shaft 906, an upper pull block 907, a pull block 908, an...
specific Embodiment approach 2
[0093] Carry out according to specific embodiment one, just: described primary fan 1, A valve 2, preheater A3, coal mill 4, burner A5 are fixedly connected by pipeline and secondary fan 6, B valve 7, preheater B8, burner B9 is fixedly connected by pipelines, replaced by secondary air blower 6, B valve 7, preheater B8, after the said preheater B8 is paralleled with burner B9 and coal mill 4 and behind coal mill 4 All burners A5 are fixedly connected by pipes. The expected good effect was also obtained.
specific Embodiment approach 3
[0095] Carry out by specific implementation mode one, just: just as figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 As shown, the blunt telescopic burner has been implemented, the frame 91 and the spout 92, the frame 91 and the support 93, one end of the pull rod 94 and the blunt body 95 are all fixedly connected and the support 93 and the pull rod 94 slide left and right live connection; also obtained the expected good results.
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Abstract
A method for maintaining wind speed by adjusting cross-sectional area of a nozzle belongs to the field for boiler. A primary air fan, an valve A, a preheater A, a coal grinding machine and a combustor A are fixed by pipes; a secondary air fan, a valve, B, a preheater B and a combustor B are fixed by pipes; the combustor B and the combustor A are fixed with a hearth furnace; the hearth furnace, a preheater C, a dust collector, a valve C, a fan and a chimney are fixed by pipes; a frame body and a nozzle, the frame body and a support are fixedly connected, and a pull rod and a blunt body are fixedly connected, and the support and the pull rod are in sliding connection; an outer frame and the upper and lower nozzles are connected by a rotating shaft; the upper and lower nozzles are fixed with the upper and lower pulling blocks; the upper and lower pulling blocks are connected with upper and lower connecting rods by the upper and lower shafts; a cylinder frame and the nozzle are connected, the cylinder frame and the support are connected, and a three-connecting is fixed with a blade and the pull rod; the cylinder frame and the blade are connected by the shaft; and the pull rod and the support are in sliding connection. The method adjusts nozzle cross-sectional area through change of distance between the bluff body and the nozzle outlet, adjusts overall nozzle cross-sectional area through the swing of the upper and lower nozzles, and regulates nozzle cross-sectional area through blade angle change driven by the three-connecting to keep the air speed at the nozzle unchanged, wherein one of the three adjustment modes is employed at one time. The method is applicable to boilers.
Description
technical field [0001] The invention relates to a method for adjusting the cross-sectional area of a spout to ensure a constant wind speed, and relates to the technical field of boilers; in particular, it relates to the technical field of power plant boilers; in particular, it relates to the technical field of a method for adjusting a cross-sectional area of a spout to ensure a constant wind speed. Background technique [0002] For power plant boilers, the situation in foreign countries and China is completely different: ①, foreign coal is fixed, the coal quality is good and stable, and the coal burned after the boiler is designed is fixed; ②, domestic coal The quality is not fixed, the coal quality is poor and the quality is unstable, and the coal burned is often changed after the boiler is designed. Both foreign and domestic boilers currently have common deficiencies, defects and disadvantages: after the pulverized coal boilers currently produced and used are designed,...
Claims
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Application Information
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