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Arrangement structure of circulating fluidized bed thermodynamic system combusting fuel with ultrahigh ash content

A circulating fluidized bed and thermal system technology, which is applied in fluidized bed combustion equipment, fuels burned in a molten state, combustion methods, etc., can solve problems such as limiting the efficient use of ultra-high ash fuels

Pending Publication Date: 2019-08-06
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, none of the above-mentioned patents solves the core problem—that is, the balance between low particle concentration and heat transfer in the furnace, which still limits the efficient utilization of ultra-high ash fuels such as stone coal with an ash content of more than 60%

Method used

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  • Arrangement structure of circulating fluidized bed thermodynamic system combusting fuel with ultrahigh ash content
  • Arrangement structure of circulating fluidized bed thermodynamic system combusting fuel with ultrahigh ash content
  • Arrangement structure of circulating fluidized bed thermodynamic system combusting fuel with ultrahigh ash content

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Embodiment 1

[0046] This embodiment is aimed at stone coal with a calorific value of 1000 kcal and an ash content close to 80%, and SiO in the coal ash composition 2 If the content exceeds 80%, the fluidized bed boiler needs to realize the supercritical parameters of 350MW.

[0047] The specific parameters of the fluidized bed boiler are shown in Table 1 below.

[0048] The concrete parameter of fluidized bed boiler in the embodiment 1 of table 1

[0049]

[0050]

[0051] Such as figure 1 As shown, the fluidized bed boiler in this embodiment has a single furnace, a single air distribution plate, balanced ventilation, one intermediate reheating, and a circulating fluidized bed combustion method. Among them, the distance H from the air distribution plate to the furnace roof is 40m.

[0052] The furnace space in the area 9m to 14m away from the air distribution plate adopts a non-equal cross-sectional structure, and the ratio of the maximum cross-sectional area to the minimum cross-...

Embodiment 2

[0057] This embodiment is aimed at stone coal with a calorific value of 1000 kcal and an ash content close to 80%, and SiO in the coal ash composition 2 If the content exceeds 80%, the fluidized bed boiler needs to achieve 600MW ultra-supercritical parameters.

[0058] The specific parameters of the fluidized bed boiler are shown in Table 2 below.

[0059] The specific parameters of fluidized bed boiler in table 2 embodiment 2

[0060] name unit BMCR working condition value main steam flow t / h 2060 main steam outlet pressure MPa(g) 26.15 Main steam outlet temperature ℃ 605 Feedwater temperature at economizer inlet ℃ 296 Reheat steam flow t / h 1676.93 Reheat steam inlet pressure MPa(g) 5.3 Reheat steam inlet temperature ℃ 362 Reheat steam outlet pressure MPa(g) 5.1 reheat steam outlet temperature ℃ 603

[0061] Such as figure 2 As shown, the fluidized bed boiler in this embodiment has a sing...

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Abstract

The invention discloses an arrangement structure of circulating fluidized bed thermodynamic system combusting fuel with ultrahigh ash content. The arrangement structure is characterized in that the portion of the area, above an air distribution plate by the distance of 15% of H, of a combustion chamber space in a combustion chamber is arranged to be of a non-equal-section structure, the ratio alpha of the maximum sectional area and the minimum sectional area in the non-equal-section structural area meets the requirement that alpha is greater than 1 and less than or equal to 2, wherein H is theheight from the air distribution plate to the top of the furnace in the combustion chamber. For the circulating fluidized bed boiler combusting the fuel with the ultrahigh ash content, through the above measures, relatively low particle concentration and the relatively low particle speed in the furnace can be maintained, the abrasion of a heated surface can be reduced, meanwhile, the heat transfer in the furnace can be taken into consideration, and the heat transfer in the furnace can be ensured to be uniform.

Description

technical field [0001] The invention relates to the technical field of using a circulating fluidized bed boiler to burn ultra-high ash fuel, and more specifically, relates to an arrangement structure of a circulating fluidized bed thermal system for burning ultra-high ash fuel. Background technique [0002] As a kind of polymetallic paragenetic shale mine, stone coal is widely distributed in my country. Stone coal has the characteristics of high ash content, low calorific value, and high hardness. It can be used not only as a low-quality fuel, but also to extract a variety of rare metals from it. According to statistics from the Ministry of Coal, my country's current reserves of stone coal resources are about 61.8 billion tons, which are widely distributed in Hunan, Guangxi, Zhejiang, Jiangxi and other places. Stone coal associated vanadium resources are abundant, of which V 2 o 5 ≥0.5% V in stone coal 2 o 5 The amount of resources is 77,075 thousand tons, which is V in ...

Claims

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Application Information

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IPC IPC(8): F23C10/10F23C10/18
CPCF23C10/10F23C10/18F23C2206/10
Inventor 鲁佳易薛大勇杨雪芬许钞俊巩李明王鹏苏虎聂立谭建斌
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP