CN200972107Y

CN200972107Y - Powdered coal recombustion device for circulation fluid-bed

Info

Publication number: CN200972107Y
Application number: CN 200620128029
Authority: CN
Inventors: 张佃明; 王兰才
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-02
Filing date: 2006-11-02
Publication date: 2007-11-07
Anticipated expiration: 2016-11-02

Abstract

The utility model relates to a coal power reburning device for circulating fluidized bed boiler, which belongs to the technological field of boiler accessory and provides a coal power reburning device which is characterized in simply structure, good reburring effect of the coal powder and good effect about environment protection. The coal power reburning device is made up of a feeding machine which is arranged below ash bucket of a deduster and an ejecting pump which is connected with ash outlet of the feeding machine. One end of the ejecting pump is communicated with a fan through ventilation pipe, and the other end is connected with an ash conveying tube. Ash outlet of the ash conveying tube is communicated with material return valve of boiler. For the ash outlet of the ash conveying tube is communicated with material return valve which is arranged on bottom of separator of the boiler, pulverized ash will be preheated in the material return valve and sent to the boiler for secondary combustion. The material return valve directs to high temperature oxidizing zone of combustion chamber of the boiler, which allows abundant combustion so as to reduce carbon contend of the pulverized ash and total amount of the pulverized ash. The utility model with simply structure can distinctly reduce energy consumption and protect environment. Therefore, the utility model is a relatively ideal product of the circulating fluidized bed boiler.

Description

CFBB flyash reburning device

Technical field

The utility model relates to a kind of CFBB flyash reburning device, belongs to the boiler accessories technical field.

Background technology

CFBB has a large amount of flyash (claiming flying dust again) and discharges out of the furnace with flue gas in running.In flying dust, still there are many combustibles to be mixed in wherein, if directly discarded, not only can waste a large amount of fuel, and be unfavorable for environmental protection.Therefore, the user adopts multiple utilization of fly ash measure, as flyash resume combustion technology, in order to energy-conservation and environmental protection.At present, the flyash resume combustion technology of being taked in the production has two kinds, wherein, a kind of method is that flyash is imported in the stove from boiler emulsion zone top, be commonly called as " face is raised ", another kind method is in the material bed of boiler bottom input stove, is commonly called as " raise at the end ", and " face is raised " weak point is that flying dust easily is blown to the hypoxemia district and is difficult for after-flame; " raise at the end " weak point is to raise blast and burner hearth bed the end to press inharmoniously, and bed presses fluctuation big, and it is unreliable to move.Therefore, adopt above-mentioned two kinds of measures all to be unfavorable for the abundant burning of flyash in stove, combustion efficiency is bad.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of CFBB flyash reburning device, and this apparatus structure is simple, can guarantee that the flyash resume combustion is effective, and help environmental protection.

It is as follows to address the above problem the technical scheme that is adopted:

A kind of CFBB flyash reburning device, it comprises the batcher 4 that is connected in dust collector ash hopper 3 bottoms, the jet pump 7 that links to each other with batcher 4 ash holes, described jet pump 7 one ends are communicated with blower fan 5 through ventilation shaft 6, the other end links to each other with ash pipeline 9, and the ash hole end of ash pipeline 9 is communicated with the returning charge valve 11 of boiler 12.

Above-mentioned CFBB flyash reburning device, described ash pipeline 9 are serially connected with one section near the ash hole end and satisfy the wear-resistant flexible flexible pipe 10 that boiler start/ stop expands.

Above-mentioned CFBB flyash reburning device is connected with full by-pass relief valve 1 and is serially connected with interactive valve 8 on the described ash pipeline 9.

Above-mentioned CFBB flyash reburning device, the ash hole end of described efferent duct 9 and horizontal direction have a slanted angle α, and the angle of α is 10 °-65 °.

CFBB flyash reburning device provided by the utility model compared with prior art, the ash hole end of different is its ash pipeline directly is communicated with the returning charge valve that boiler is located at separator lower end, can make flying dust preheating in the returning charge valve in advance like this, heat up to be admitted to again and carry out second-time burning in the stove.Because what this place was right just is the oxygen enrichment high-temperature area of boiler furnace, can be fully burned so be imported into the interior flyash of stove, to reduce unburned carbon in flue dust and to reduce the flying dust amount.Its good effect is obviously to cut down the consumption of energy, and reduces production costs, and reduces the waste discharge amount, helps environmental protection.The utility model is simple in structure, is the comparatively ideal auxiliary products of CFBB.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model.

Number in the figure is: 1. safety valve 2. ash guiding pipes 3. dust collector ash hoppers 4. batchers 5. blower fans 6. ventilation shafts 7. jet pumps 8. interactive valve 9. ash pipelines 10. wear-resistant flexible flexible pipes 11. returning charge valves 12. boilers

The specific embodiment

The utility model is described in further detail below in conjunction with the embodiment accompanying drawing:

Referring to accompanying drawing, comprise in the formation of the present utility model the batcher 4 that is connected in dust collector ash hopper 3 bottoms, with the jet pump 7 that batcher 4 outlets link to each other, described jet pump 7 one ends are communicated with blower fan 5 through ventilation shaft, blower fan 5 can be selected roots blower for use.The other end of jet pump 7 links to each other with ash pipeline 9, and the ash hole end of ash pipeline 9 is communicated with the returning charge valve 11 of boiler 12.

For ease of the blast in understanding and the observation ventilation shaft 6, can on ventilation shaft 6, set up Pressure gauge.

Because boiler can produce breathing in shutdown process, as the pipeline that is attached thereto adopts the metallic conduit of rigidity fully, the welding seam breaking phenomenon can appear because of the expansion of boiler in pipeline, therefore, the ash pipeline 9 of this device is serially connected with one section expansion wear-resistant flexible pipe 10 near the ash hole end, the size of the visual supporting type of furnace of length of flexible pipe 10 determines that its length generally can be selected between 1-3 rice.

In this device busy process,, can on ash pipeline 9, connect a bypass safety valve 1 and serial connection one interactive valve 8 in order effectively to solve the clogging of ash pipeline 9.Safety valve 1 and interactive valve 8 can be selected the Pneumatic gate valve of same model for use.The course of work formula of two valves is such: when the normal operation of this device, interactive valve 8 is the unlatching shape, and safety valve 1 is closes shape.When clogging appearred in ash pipeline 9, interactive valve 8 cut out, and safety valve 1 is opened, and at this moment, the flyash in the ash pipeline 9 just can turn back in the ash bucket of deduster again through safety valve 1 and ash guiding pipe 2.

In order to make the flyash combustion efficiency that is transported in the stove better, prevent to send grey wind and returning charge wind facies to interfere.Can make the ash hole end and the horizontal direction of the ash pipeline 9 of this device that one slanted angle α is arranged, the angle of α is preferably in value between 10 °-65 °, decides on the refeed line angle.

Claims

1. CFBB flyash reburning device, it is characterized in that it comprises the batcher [4] that is connected in dust collector ash hopper [3] bottom, the jet pump [7] that links to each other with batcher [4] ash hole, described jet pump [7] one ends are communicated with blower fan [5] through ventilation shaft [6], the other end links to each other with ash pipeline [9], and the ash hole end of ash pipeline [9] is communicated with the returning charge valve [11] of boiler [12].

2. CFBB flyash reburning device according to claim 1 is characterized in that described ash pipeline [9] is serially connected with one section near the ash hole end and satisfies the wear-resistant flexible flexible pipe [10] that boiler start/ stop expands.

3. CFBB flyash reburning device according to claim 1 and 2 is characterized in that being connected with on the described ash pipeline [9] full by-pass relief valve [1] and is serially connected with interactive valve [8].

4. CFBB flyash reburning device according to claim 1 and 2 is characterized in that the ash hole end of described efferent duct [9] and horizontal direction have a slanted angle [α], and the angle of [α] is 10 °-65 °.

5. CFBB flyash reburning device according to claim 3 is characterized in that the ash hole end of described efferent duct [9] and horizontal direction have a slanted angle [α], and the angle of [α] is 10 °-65 °.