CN201858639U - Spraying blow pipe material returner for circulating fluidized bed boiler - Google Patents
Spraying blow pipe material returner for circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN201858639U CN201858639U CN2010205903492U CN201020590349U CN201858639U CN 201858639 U CN201858639 U CN 201858639U CN 2010205903492 U CN2010205903492 U CN 2010205903492U CN 201020590349 U CN201020590349 U CN 201020590349U CN 201858639 U CN201858639 U CN 201858639U
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- winding
- pipe
- returning device
- material returning
- pipe material
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Abstract
The utility model relates to a spraying blow pipe material returner for a circulating fluidized bed boiler, which consists of a feeding pipe, a discharge pipe, a spraying blow pipe material returner, a spraying blow pipe, an air inlet pipe and a fan, wherein one end of the feeding pipe is communicated with the middle part of the spraying blow pipe material returner, and the other end of the feeding pipe is connected with a material returner of the circulating fluidized bed boiler; one end of the discharge pipe is communicated with the front part of the spraying blow pipe material returner, and the other end of the discharge pipe is connected into a hearth of the circulating fluidized bed boiler; the spraying blow pipe material returner is internally provided with at least one spraying blow pipe, an air inlet of which extends outside the spraying blow pipe material returner and is communicated with an air inlet pipe connected on the spraying blow pipe material returner; the other end of the air inlet pipe is connected with the fan; one end of the spraying blow pipe, positioned inside the spraying blow pipe material returner is closed off by a plug; and the wall of the spraying blow pipe, positioned inside the spraying blow pipe material returner, is provided with a plurality of air outlet holes. The spraying blow pipe material returner is taken as a secondary material returning device of the circulating fluidized bed boiler, and solves the problems that ash is emitted at an observation hole and the like of a scraper coal feeder of the circulating fluidized bed boiler and coke is easily formed since the temperature at the bottom of the hearth of the boiler is overhigh, so that the boiler can reach the requirement of the production load.
Description
Technical field
The utility model belongs to the CFBB technical field, relates to a kind of winding-up pipe material returning device that is used for CFBB, and winding-up pipe material returning device of the present utility model is installed on the back wall material returning device of CFBB.
Background technology
The coal-feeding mode of CFBB generally can be divided into front wall coal supply and two kinds of back wall material returning device coal supplies.Two kinds of coal-feeding modes respectively have pluses and minuses, the advantage of front wall coal supply is the coal supply simplicity of design, has shortened the coal supply stroke, has reduced the equipment investment and the maintenance of feeder, but because the common employing belt coal-feeding machine of front wall coal-feeding mode, under failure condition, high-temperature flue gas is played a reversed role, and can cause the scaling loss of belt coal-feeding machine, in addition, generally increased equipment such as rotatory feeder valve, flapper on coal spout, because design problem, the probability that chute blockage bite phenomenon occurs is also than higher.In order to guarantee the uniformity of front wall coal supply, the front wall coal supply generally adopts the multiple spot coal-feeding mode, a lot of boiler producers have designed broadcasts the coal booster fan, also can consume certain station service, increased the investment and the maintenance of equipment simultaneously, simultaneously, the front wall coal supply is because coal spread wind can be to the aerodynamic field disturbance in the stove, cause the uneven and material skewness of cloth wind, cause the accelerated wear test of front water wall at last.
The major advantage of back wall material returning device coal supply is that fire coal had carried out Hybrid Heating with returning charge before entering burner hearth, help separating out and after-flame of fuel volatile matter, before arriving bed surface, fuel carried out sufficient preheating, help burning and effectively prevent chute blockage, in addition, because fuel enters burner hearth with returning charge, the homogeneity question of fuel feed can be well solved.The subject matter of back wall material returning device coal supply system is the coal supply line length, is belt coal-feeding machine and scraper plate feeder two-stage coal supply,
In service in actual production, find that also there is following defective in back wall material returning device coal-feeding mode:
1, CFBB can't reach oepration at full load.Boiler bed temperature under a small amount of coal supply will reach 950 ℃, if continuation coal, bed temperature just will rise to the coking temperature, the helpless primary air flow that can only strengthen cools off bed temperature, but this measure increase boiler load is limited, has but increased the oxygen content of flue gas greatly, sometimes reach more than 10%, the boiler operatiopn cost is increased, the scope of substantial deviation economical operation, even make produce fall into a passive position among.The reason that produces above result is because the boiler furnace design is higher, the flying dust outer circulation is not smooth, the soot particle of greater particle size can't reach exhanst gas outlet, more can't enter separator separates, it is too thin that separator separates grey particle diameter down, again because the boiler coal dropping port is higher apart from blast cap, and the thin grey emulsion zone that under the effect of wind and air inducing, can't reach bed, can't cool off bed temperature, thereby make bed temperature be issued to high bed temperature at low coal-supplying amount.
2, the dust of constantly emerging from the junction of the peep hole of scraper plate feeder and belt coal-feeding machine and scraper plate feeder, cause a large amount of dust stratifications of boiler scraper plate feeder platform, cause the personnel can't be close when serious, had influence on normally and patrolled and examined, safeguard and overhaul, not only influenced the environmental sanitation of workplace greatly, and the continuous safe and stable operation of boiler brought unsafe factor, have influence on security civilization production.
Summary of the invention
The purpose of this utility model provides a kind of winding-up pipe material returning device that is used for CFBB, this winding-up pipe material returning device is a cover secondary material-returning device that increases on the basis of former CFBB material returning device, does not reach near the problem of emitting ash load and the material returning device of producing in order to solve present CFBB.
The utility model is used for the winding-up pipe material returning device of CFBB by feeding pipe, discharge nozzle, winding-up pipe material returning device, the winding-up pipe, blast pipe and blower fan are formed, described winding-up pipe material returning device is the chamber of a sealing, described feeding pipe one end is communicated with the middle part of winding-up pipe material returning device, the other end connects the material returning device of CFBB, discharge nozzle one end is communicated with the front portion of winding-up pipe material returning device, the other end is connected in the boiler furnace of CFBB, at least one winding-up pipe is installed in described winding-up pipe material returning device, the air inlet of described winding-up pipe stretches out outside the winding-up pipe material returning device, be communicated with the blast pipe on being connected winding-up pipe material returning device, the other end of blast pipe connects blower fan, the winding-up pipe is positioned at an end of winding-up pipe material returning device to be shut by plug, and the tube wall that is positioned at winding-up pipe material returning device on the winding-up pipe is provided with some exhaust vents that are communicated with winding-up pipe material returning device chamber.
Usually, evenly be furnished with 3 winding-up pipes in winding-up pipe material returning device, 3 winding-up pipes arrange that in a triangle angle between any two is 60 °.
Wherein, be arranged on the exhaust vent segmentation setting on the winding-up tube wall, be gradual change type and distribute, the middle part is located at winding-up tube wall below with respect to the exhaust vent at feeding pipe place, and front end is located at winding-up tube wall top with respect to the exhaust vent at discharge nozzle place.Simultaneously, described exhaust vent is provided with two rows.
Further, require discharge nozzle is installed in the material returning device discharge nozzle below of material returning device.
Be connected with original material returning device for the ease of the pipe material returning device of will jetting, expansion joint also is installed on described feeding pipe.
The utility model is by observing the grey situation of emitting of scraper plate feeder observation panel, when finding that boiler oil humidity is high, scraper plate feeder etc. locates to emit grey situation serious, emits grey degree to alleviate under the reverse situation, illustrates that the wet degree of doing of grey situation and fuel of emitting that scraper plate feeder etc. is located has certain relation.Further test is found, the reason of emitting ash is that water vapour carries the returning charge flying dust and forms because the water evaporates that coal mixes with returning charge in the coal of back produces water vapour.
Therefore, the utility model increases winding-up pipe material returning device as the secondary material-returning device on original material returning device basis, regulate the winding-up air quantity of winding-up pipe material returning device by the rotating speed of regulating blower fan, control the flow of original material returning device internal return ash by winding-up pipe material returning device, reach the proportionate relationship of regulating returning charge and fuel in original material returning device, realize the purpose of control fuel preheat temperature, thereby the water evaporation quantity in the control fuel reaches and reduces the purpose that scraper plate feeder observation panel emits the ash amount.
After adopting the utility model technology, to transforming the boiler operation of lighting a fire, the grey situation of emitting that scraper plate feeder observation panel etc. is located is finished disappearance, and becomes negative pressuren zone, prove that winding-up manages the use of material returning device and thoroughly solved the grey problem of emitting.
Simultaneously, when implementing the utility model, the returning charge of winding-up pipe material returning device enters the emulsion zone bottom of boiler furnace, played the effect that reduces bed temperature, make boiler need carry out coal according to load, to the oepration at full load of boiler with put forward load speed and all bring great convenience, also solved the problem of the too high easy formation coking of temperature at the bottom of the boiler furnace.
The use of the utility model winding-up pipe material returning device, solved the major defect of wall coal supply system behind the CFBB, saved resource, reduced production cost, reduced the particulate pollutant discharging, purified environment, made back wall coal supply system in CFBB maximizes, have more significantly competitive advantage than front wall coal supply system.
Description of drawings
Fig. 1 is the structural representation that the utility model is used for the winding-up pipe material returning device of circulating fluidized bed boiler;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is the vertical view of winding-up pipe among Fig. 1;
Fig. 4 is the upward view of winding-up pipe among Fig. 1;
Fig. 5 is the cutaway view of winding-up pipe among Fig. 1;
Fig. 6 is the D-D cutaway view of Fig. 5;
Fig. 7 is the C-C cutaway view of Fig. 5;
Fig. 8 is the B-B cutaway view of Fig. 5;
Fig. 9 is the mounting structure schematic diagram of the utility model winding-up pipe material returning device on CFBB.
The specific embodiment
Circulating fluidized bed boiler structure such as Fig. 9, comprise boiler furnace 17, blast cap 16, air compartment 15, separator 18, boiler flue 19, material returning device 11 and scraper plate feeder 20, be provided with blast cap 16 and air compartment 15 in the boiler furnace 17, the top of separator 18 is communicated with boiler furnace 17 and boiler flue 19 respectively, the bottom connects material returning device 11 by ash inlet tube 14, material returning device 11 tops connect scraper plate feeder 20 by coal feeding pipe 13, and material returning device 11 also connects boiler furnace 17 by material returning device discharge nozzle 12.
Winding-up pipe material returning device structure such as Fig. 1 of being used for circulating fluidized bed boiler, form by feeding pipe 1, expansion joint 2, discharge nozzle 3, winding-up pipe material returning device 4, winding-up pipe 5, blast pipe 6 and blower fan 7, feeding pipe 1 one ends are communicated with the middle part of winding-up pipe material returning device 4, the other end connects the material returning device 11 of CFBB, also is equipped with one and is beneficial to flexible expansion joint 2 on feeding pipe 1; Discharge nozzle 3 is installed in material returning device discharge nozzle 12 belows of material returning device 11, and the one end is communicated with the front portion of winding-up pipe material returning device 4, and the other end is connected in the boiler furnace 17 of CFBB; Winding-up pipe material returning device 4 is the chamber of a sealing, as Fig. 2,3 winding-up pipes 5 is installed in a triangle in it, and winding-up pipe 5 angle between any two is 60 °; Structure such as Fig. 5 of winding-up pipe 5, its end that is positioned at winding-up pipe material returning device 4 is shut by plug 10, and other end air inlet 8 stretches out outside the winding-up pipe material returning device 4, is communicated with the other end connection blower fan 7 of blast pipe 6 with blast pipe 6 on being connected winding-up pipe material returning device 4; On the tube wall that is positioned at winding-up pipe material returning device 4 on the winding-up pipe 5, be provided with some exhaust vents 9 that are communicated with winding-up pipe material returning device 4 chambers.
Claims (7)
1. the winding-up pipe material returning device that is used for CFBB, by feeding pipe (1), discharge nozzle (3), winding-up pipe material returning device (4), winding-up pipe (5), blast pipe (6) and blower fan (7) are formed, it is characterized in that described winding-up pipe material returning device (4) is the chamber of a sealing, described feeding pipe (1) one end is communicated with the middle part of winding-up pipe material returning device (4), the other end connects the material returning device (11) of CFBB, discharge nozzle (3) one ends are communicated with the front portion of winding-up pipe material returning device (4), the other end is connected in the boiler furnace (17) of CFBB, at least one winding-up pipe (5) is installed in described winding-up pipe material returning device (4), the air inlet (8) of described winding-up pipe (5) stretches out outside the winding-up pipe material returning device (4), be communicated with the blast pipe (6) on being connected winding-up pipe material returning device (4), the other end of blast pipe (6) connects blower fan (7), and the tube wall that is positioned at winding-up pipe material returning device (4) on the winding-up pipe (5) is provided with some exhaust vents (9) that are communicated with winding-up pipe material returning device (4) chamber.
2. the winding-up pipe material returning device that is used for CFBB according to claim 1, it is characterized in that being arranged on exhaust vent (8) the segmentation setting on described winding-up pipe (5) tube wall, the exhaust vent of locating with respect to feeding pipe (1) (9) is located at winding-up pipe (5) tube wall below, and the exhaust vent of locating with respect to discharge nozzle (3) (9) is located at winding-up pipe (5) tube wall top.
3. the winding-up pipe material returning device that is used for CFBB according to claim 1 is characterized in that described exhaust vent (9) is provided with two rows.
4. the winding-up pipe material returning device that is used for CFBB according to claim 1 is characterized in that described winding-up pipe (5) is positioned at the end of managing material returning device (4) of jetting and is shut by plug (10).
5. the winding-up pipe material returning device that is used for CFBB according to claim 1 and 2, it is characterized in that in winding-up pipe material returning device (4), being provided with 3 winding-up pipes (5), described winding-up pipe (5) arranges evenly that in winding-up pipe material returning device (4) angle is 60 ° between any two.
6. the winding-up pipe material returning device that is used for CFBB according to claim 1 is characterized in that described discharge nozzle (3) is installed in material returning device discharge nozzle (12) below of material returning device (11).
7. the winding-up pipe material returning device that is used for CFBB according to claim 1 is characterized in that being equipped with expansion joint (2) on described feeding pipe (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205903492U CN201858639U (en) | 2010-10-30 | 2010-10-30 | Spraying blow pipe material returner for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205903492U CN201858639U (en) | 2010-10-30 | 2010-10-30 | Spraying blow pipe material returner for circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201858639U true CN201858639U (en) | 2011-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205903492U Expired - Lifetime CN201858639U (en) | 2010-10-30 | 2010-10-30 | Spraying blow pipe material returner for circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201858639U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963351A (en) * | 2010-10-30 | 2011-02-02 | 山西潞安矿业(集团)有限责任公司 | Blowing tube material returner used for circulating fluidized bed boiler |
| CN106369596B (en) * | 2016-08-19 | 2018-10-12 | 北京热华能源科技有限公司 | A kind of bed material external circulating device and operation method for circulating fluidized bed boiler |
-
2010
- 2010-10-30 CN CN2010205903492U patent/CN201858639U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963351A (en) * | 2010-10-30 | 2011-02-02 | 山西潞安矿业(集团)有限责任公司 | Blowing tube material returner used for circulating fluidized bed boiler |
| CN101963351B (en) * | 2010-10-30 | 2012-02-01 | 山西潞安矿业(集团)有限责任公司 | Blowing tube material returner used for circulating fluidized bed boiler |
| CN106369596B (en) * | 2016-08-19 | 2018-10-12 | 北京热华能源科技有限公司 | A kind of bed material external circulating device and operation method for circulating fluidized bed boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110608 Effective date of abandoning: 20120201 |