Blowing tube material returner used for circulating fluidized bed boiler

A circulating fluidized bed and blowing pipe technology, which is applied in the field of circulating fluidized bed boilers, can solve the problems that fine ash cannot reach the dense phase area of ​​the bed, increase the oxygen content of flue gas, and deviate from the scope of economic operation, and reduce the The effect of particulate pollutant emissions, lower production costs, and obvious competitive advantages

CN101963351AInactive Publication Date: 2011-02-02SHANXI LUAN MINING GRP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-02-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a blowing tube material returner used for a circulating fluidized bed boiler. The blowing pipe material returner consists of a feeding tube, a discharge tube, the blowing tube material returner, a blowing tube, an air inlet tube and a draught fan, wherein one end of the feeding tube is communicated with the middle part of the blowing tube material returner while the other end is connected with a material returner of the circulating fluidized bed boiler; one end of the discharge tube is communicated with the front end of the blowing tube material returner while the other end is connected into a boiler furnace of the circulating fluidized bed boiler; at least one blowing tube is arranged in the blowing tube material returner; the air inlet of the blowing tube is extended out of the blowing tube material returner and is communicated with the air inlet tube connected with the blowing tube material returner; the other end of the air inlet tube is connected with the draught fan; one end, positioned in the blowing tube material returner, of the blowing tube is closed off by an end cap; and the tube wall positioned in the blowing tube material returner is provided with a plurality of air outlets. The blowing tube material returner serves as a secondary material returning device of the circulating fluidized bed boiler, and solves the problem that ash is emitted from a viewing port and the like of a scraper feeder of the circulating fluidized bed boiler and the problem that a coke is easy to form because the temperature at the bottom of the boiler furnace is over-high, so that the boiler can meet the requirement on production load.
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Description

technical field

[0001] The invention belongs to the technical field of circulating fluidized bed boilers, and relates to a blowing pipe return device for circulating fluidized bed boilers. The blowing pipe return device of the present invention is installed on the rear wall return device of the circulating fluidized bed boiler . Background technique

[0002] The coal feeding methods of circulating fluidized bed boilers can generally be divided into two types: front wall coal feeding and rear wall return feeder coal feeding. The two coal feeding methods have their own advantages and disadvantages. The advantage of the front wall coal feeding is that the coal feeding design is simple, the coal feeding stroke is shortened, and the equipment investment and maintenance of the coal feeder are reduced. However, the front wall coal feeding method generally uses a belt Coal feeder, in case of failure, the high-temperature flue gas will flow back, which will cause the belt coal feede...

Examples

Embodiment Construction

[0027] The structure of circulating fluidized bed boiler is as follows: Figure 9 , including boiler furnace 17, air cap 16, air chamber 15, separator 18, boiler flue 19, feeder 11 and scraper coal feeder 20, boiler furnace 17 is provided with air cap 16 and air chamber 15, separator 18 The upper part communicates with the boiler furnace 17 and the boiler flue 19 respectively, the lower part is connected to the return feeder 11 through the ash inlet pipe 14, the upper part of the return feeder 11 is connected to the scraper coal feeder 20 through the coal inlet pipe 13, and the return feeder 11 is also passed through the return feeder 11. The discharge pipe 12 of the feeder is connected to the furnace 17 of the boiler.

[0028] The structure of the blow pipe return feeder used in the circulating fluidized bed boiler is as follows: figure 1 , consisting of feed pipe 1, expansion joint 2, discharge pipe 3, spray pipe return device 4, blow pipe 5, air intake pipe 6 and fan 7, on...