A reforming device for burning biomass in a circulating fluidized bed coal-fired boiler

A technology of circulating fluidized bed and coal-fired boilers, which is applied in the direction of fluidized bed combustion equipment, fuel burned in molten state, combustion type, etc., and can solve the problem of not being able to carry the design load of boiler steam production, insufficient return material, and accelerated flue gas flow and other problems, to achieve the effect of solving the shortage of returned ash, increasing the amount of returned ash, and increasing the load of the boiler

CN109458614BActive Publication Date: 2020-01-21湖南骏泰生物质发电有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-01-21

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Abstract

The invention discloses a recirculating fluidized bed coal-fired boiler biomass combustion retrofitting device. The retrofitting device comprises a hearth, and the lower end and the side end of the hearth are provided with a cooler and a material returning system optimizing device correspondingly; the lower end of the material returning system optimizing device is provided with an air blower, andthe side end of the material returning system optimizing device communicates with a filter, a coal economizer and an air preheater; the air preheater communicates with an ash remover, and the ash remover communicates with a chimney through an induced draft fan; the side end of the hearth is provided with a feeding system; and the feeding system comprises a feed inlet, an air locking device is arranged in the feed inlet, and the feeding system communicates with a conveying system. According to the recirculating fluidized bed coal-fired boiler biomass combustion retrofitting device, by retrofitting the conveying system and the feeding system, biomass conveying and passing are facilitated, the boiler load is increased, meanwhile, biomass combustion fly ash is further collected, an ash hopperconnected with the ash remover in a boiler is additionally provided with a fly ash recirculation pipe, and the ash returning amount of the hearth in a boiler system is effectively increased; and by arranging the low-pressure coal economizer, the smoke exhaust temperature is lowered, and the smoke exhaust efficiency is improved.
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Description

Technical field

[0001] The invention belongs to the field of boiler reforming devices, in particular to a reforming device for burning biomass in a circulating fluidized bed coal-fired boiler. Background technique

[0002] Coal-fired boilers have been reformed and increased the proportion of biomass blending. In the process of burning biomass, due to the many differences in the properties of biomass and coal, many operational problems have occurred.

[0003] The most intuitive problem of coal-fired boilers is that the capacity of the conveying system and the feeding system is insufficient, or the existing conveying system and the modification system cannot carry the design load of the boiler's steam production, which affects the stability.

[0004] In the control of circulating fluidized bed bed temperature, the control of the amount of returned ash is the most effective measure. However, the ash content of biomass is lower than that of coal, and the amount of returned ash often cann...

Examples

Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limitation on the scope of protection of the present invention. .

[0027] Such as Figure 1-Figure 3 As shown, the specific structure of the present invention is:

[0028] A reforming device for burning biomass in a circulating fluidized bed coal-fired boiler. It includes a furnace 1. The lower and side ends of the furnace 1 are respectively provided with a cooler 5 and a return system optimization device 6, and the lower end of the return system optimization device 6 A blower 17 is provided. The side end of the return system optimization device 6 is connected to the filter 7, the first economizer 8, and the air preheater 9. The air preheater 9 is connected to the dust col...