CN209926346U - east-Junggar coal low-temperature combustion control system - Google Patents
east-Junggar coal low-temperature combustion control system Download PDFInfo
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- CN209926346U CN209926346U CN201920246560.3U CN201920246560U CN209926346U CN 209926346 U CN209926346 U CN 209926346U CN 201920246560 U CN201920246560 U CN 201920246560U CN 209926346 U CN209926346 U CN 209926346U
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Abstract
The utility model provides a quandong coal low temperature combustion control system, the utility model relates to a combustion control system, the utility model discloses a very easily arouse the problem that the boiler slagged and stain when solving quandong coal burning, the utility model discloses a boiler furnace, a plurality of over-fire air burner, circulation flue and afterbody flue, a low temperature combustion control system of quandong coal still includes the pulverized coal burner subassembly, the pulverized coal burner subassembly sets up on boiler furnace inner wall along furnace center equipartition, a plurality of over-fire air burner sets up in pulverized coal burner subassembly top, and the afterbody flue is located the right-hand member of boiler, and the lower extreme of afterbody flue is equipped with the smoke extraction mouth, and the one end of circulation flue is connected with boiler furnace through over-fire air burner, and the other end and the smoke extraction mouth of circulation flue are connected.
Description
Technical Field
The utility model relates to a combustion control system, concretely relates to be used for eastern Junggar coal low temperature combustion control system.
Background
The eastern Junggar coal field is explored and confirmed in 2005 to store billions of coal resources underground, the predicted reserves reach 3900 million tons, and the reserves of the coal resources are cumulatively detected to be 2136 million tons at present, so that the eastern Junggar coal field is the largest whole coal field in China at present. Under the condition that a batch of old energy bases in the east and middle parts of China show a resource exhaustion trend and the national energy demand is continuously increased, the Xinjiang coal becomes an important energy continuing area and a strategic energy reserve area in China. Na in ash with extremely high alkali metal content in east Junggar coal2The content of O is 5 to 10 percent; the CaO content is 20-40%, and the boiler is easy to be slagged and contaminated during combustion, so that the boiler cannot be installedThe fully reliable operation, the eastern Junggar coal combustion technology becomes a worldwide difficult problem to be solved urgently, and the large-scale application of the eastern Junggar coal is severely restricted. The characteristics of high moisture, strong slag bonding property and serious dirt-sticking property of the eastern Junggar coal make the burning of the eastern Junggar coal in a boiler incapable of adopting a conventional burning control method.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the burning of the eastern Junggar coal easily causes the boiler slagging and the contamination, and then providing a eastern Junggar coal low-temperature combustion control system.
The technical scheme of the utility model is that:
the utility model provides a quandong coal low temperature combustion control system, it includes boiler furnace, a plurality of after-combustion air burner, circulation flue and afterbody flue, a quandong coal low temperature combustion control system still includes the coal burner subassembly, the coal burner subassembly sets up on boiler furnace inner wall along furnace center equipartition, a plurality of after-combustion air burner set up in coal burner subassembly top, and the afterbody flue is located the right-hand member of boiler, and the lower extreme of afterbody flue is equipped with the smoke extraction mouth, and the one end of circulation flue is connected with boiler furnace through after-combustion air burner, and the other end and the smoke extraction mouth of circulation flue are connected.
Furthermore, each pulverized coal burner assembly is composed of a plurality of pulverized coal combustion units, the pulverized coal combustion units are vertically arranged from top to bottom in sequence, each pulverized coal combustion unit comprises a pulverized coal burner and two secondary air nozzles, and the two secondary air nozzles are respectively positioned above and below the pulverized coal burner.
Furthermore, a large-diameter secondary air nozzle is arranged below the pulverized coal burner in the pulverized coal combustion unit positioned at the bottom of the pulverized coal burner assembly, and a small-diameter air nozzle is arranged above the pulverized coal burner; a large-diameter secondary air nozzle is arranged above the pulverized coal burner in the pulverized coal combustion unit positioned at the top of the pulverized coal burner component, and a small-diameter air nozzle is arranged below the pulverized coal burner; and small-caliber air nozzles are arranged above and below the pulverized coal burner in the pulverized coal combustion unit positioned in the middle of the pulverized coal burner component.
Furthermore, the device also comprises a flow measuring device, an expansion joint, a flue gas circulating fan and a flue gas circulating baffle, wherein the flow measuring device, the expansion joint, the flue gas circulating fan and the flue gas circulating baffle are sequentially arranged on the circulating flue from front to back.
Further, the smoke circulating baffle is positioned at the lower end of the smoke suction port.
Further, the flue gas dust collector is arranged on the tail flue.
Compared with the prior art, the utility model has the following effect:
1. the utility model provides a low-temperature combustion control system suitable for high-alkali eastern Junggar coal, which solves the problems of boiler slagging and contamination which are easily caused when the eastern Junggar coal is combusted by optimizing the arrangement form of a burner, a combustion unit and a flue gas recirculation mode; 2. the unit system combustion concept provided aiming at the coal quality characteristics of the eastern Junggar coal divides each layer of mill into relatively independent combustion units, so that the combustion is relatively independent and uniform, and the influence on adjacent mills is reduced as much as possible. The oxygen content of the main combustion area is preferably approximate to complete combustion, the highest smoke temperature of the hearth is controlled in an over-fire air area and rapidly decreases along with the increase of the elevation of the hearth, and a soot blower arrangement form suitable for the eastern Junggar coal is used as an auxiliary mode, so that the low-temperature combustion of the eastern Junggar coal is realized, and the difficult problems of easy slagging and contamination of the burning eastern Junggar coal are solved; 3. in the partial flue gas that draws the boiler through the smoke outlet and discharges sent back to the stove, utilize inert gas's heat absorption and oxygen concentration's reduction, reduce flame temperature, restrain the burning rate, reduce NOx's formation and furnace radiation heat absorption, make water-cooling wall system temperature level controllable, can not only alleviate the slagging scorification of boiler by a wide margin, stain and the condition of deposition like this, can also reduce boiler nitrogen oxide's formation volume by a wide margin, guarantee that the boiler can be safe, stable use high-alkali eastern coal. The smoke temperature at the smoke exhaust port is about 100-; 4. the method provides technical support for the application of the Jundong coal in the field of thermal power, changes the Xinjiang Jundong coal into valuable, and provides strong assistance for guaranteeing national energy safety, power transmission and stability in Xinjiang areas.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a combustion unit;
fig. 3 is a left side view of fig. 2.
Detailed Description
The first embodiment is as follows: the embodiment is described by combining fig. 1, and the system for controlling low-temperature burning of the eastern Junggar coal comprises a boiler furnace 1, an over-fire air burner 2, a circulating flue 6 and a tail flue 9, and further comprises a pulverized coal burner component 3, wherein the pulverized coal burner component 3 is uniformly arranged on the inner wall of the boiler furnace 1 along the center of the furnace, the over-fire air burner 2 is arranged above the pulverized coal burner component, the tail flue 9 is arranged at the right end of the boiler, a smoke exhaust port 10 is arranged at the lower end of the tail flue 9, one end of the circulating flue 6 is connected with the boiler furnace 1 through the over-fire air burner, and the other end of the circulating flue 6 is connected with the smoke exhaust port 10.
Set up the smoke extraction mouth at the afterbody of boiler, the low temperature flue gas after the ash removal divides to take out from the smoke extraction mouth, sends into after-burning air combustor 2 through circulation flue 6, jets into boiler furnace 1 high temperature combustion area after mixing with after-burning air, can effectively alleviate the condition of the slagging scorification of boiler, stain and deposition.
The second embodiment is as follows: referring to fig. 1 to 3, the present embodiment is described, each pulverized coal burner assembly 3 of the present embodiment is composed of a plurality of pulverized coal combustion units, the pulverized coal combustion units are vertically arranged from top to bottom in sequence, each pulverized coal combustion unit includes a pulverized coal burner 12 and two secondary air nozzles, and the two secondary air nozzles are respectively located above and below the pulverized coal burner 12.
The unit combustion concept is established, one pulverized coal burner and two secondary air nozzles are taken as a group of combustion units, each pulverized coal burner is provided with peripheral air, the number of the combustion units is reasonably configured according to the capacity of a boiler, the working condition of each group of combustion units is relatively stable, and air distribution is independent. And the arrangement form of soot blowers suitable for the eastern Junggar coal is assisted, the arrangement number of the soot blowers is increased, and the space of the installation position of the hydraulic soot blower is reserved above the inflection point of the cold ash bucket. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: referring to fig. 1, the present embodiment is described, in which a pulverized coal burner 12 in a pulverized coal combustion unit located at the bottom of a pulverized coal burner assembly 3 is provided with a large-diameter secondary air nozzle 13 at the lower part and a small-diameter air nozzle 14 at the upper part; a large-diameter secondary air nozzle 13 is arranged above a pulverized coal burner 12 in a pulverized coal combustion unit positioned at the top of the pulverized coal burner component 3, and a small-diameter air nozzle 14 is arranged below the pulverized coal burner 12; the small-bore air nozzles 14 are arranged above and below the pulverized coal burner 12 in the pulverized coal combustion unit positioned in the middle of the pulverized coal burner component 3.
The aperture of the secondary air nozzle 13 is divided into a plurality of sizes, and the lower layer bottom supporting air needs larger air quantity, so that the nozzle size is needed to be slightly larger. Other components and connection relationships are the same as those in the second embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the embodiment further includes a flow measuring device 4, an expansion joint 5, a flue gas circulating fan 7, and a flue gas circulating baffle 11, where the flow measuring device 4, the expansion joint 5, the flue gas circulating fan 7, and the flue gas circulating baffle 11 are sequentially disposed on the circulating flue 6 from front to back.
So arranged, the measuring device 4 is used for measuring the circulating smoke gas amount; the expansion joint 5 is used for absorbing metal thermal deviation and preventing metal tensile fracture caused by the thermal deviation; the flue gas circulating fan 7 is used for overcoming the resistance of a circulating flue and ensuring the circulating amount of flue gas; the circulating flue gas amount is controlled by adjusting the opening degree of the flue gas circulating baffle 11.
Other components and connections are the same as in the first embodiment.
The fifth concrete implementation mode: referring to fig. 1, the flue gas circulation baffle 11 of the present embodiment is located at the lower end of the smoke exhaust port 10. Other compositions and connection relations are the same as those of the fourth embodiment.
The sixth specific implementation mode: the embodiment is described with reference to fig. 1, and the embodiment further comprises a flue gas dust collector 8, and the flue gas dust collector 8 is mounted on the tail flue 9. The flue gas dust remover 8 is conventional equipment of power plant, so set up for a large amount of dusts that carry in the desorption flue gas, avoid the appearance of afterbody flue deposition and wearing and tearing, corruption scheduling problem. Other components and connections are the same as in the first embodiment.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited to the embodiments disclosed herein, and other changes and modifications within the spirit of the present invention may be made by those skilled in the art and those changes and modifications not mentioned herein are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a eastern Junggar coal low temperature combustion control system, it includes boiler furnace (1), after-combustion air burner (2), circulation flue (6) and afterbody flue (9), its characterized in that: the low-temperature combustion control system of eastern Junggar coal still includes pulverized coal burner subassembly (3), pulverized coal burner subassembly (3) set up on boiler furnace (1) inner wall along furnace center equipartition, burn out air burner (2) set up in pulverized coal burner subassembly top, and afterbody flue (9) are located the right-hand member of boiler, and the lower extreme of afterbody flue (9) is equipped with smoke extraction mouth (10), and the one end of circulating flue (6) is connected with boiler furnace (1) through burning out air burner, and the other end and the smoke extraction mouth (10) of circulating flue (6) are connected.
2. The system for controlling low-temperature combustion of eastern Junggar coal as claimed in claim 1, wherein: each pulverized coal burner component (3) is composed of a plurality of pulverized coal combustion units, the pulverized coal combustion units are vertically arranged from top to bottom in sequence, each pulverized coal combustion unit comprises a pulverized coal burner (12) and two secondary air nozzles, the two secondary air nozzles are respectively positioned above and below the pulverized coal burner (12), and each pulverized coal combustion unit is independently air-distributed.
3. The system for controlling low-temperature combustion of eastern Junggar coal as claimed in claim 2, wherein: a large-caliber secondary air nozzle (13) is arranged below the pulverized coal burner (12) in the pulverized coal combustion unit positioned at the bottom of the pulverized coal burner component (3), and a small-caliber air nozzle (14) is arranged above the pulverized coal burner; a large-caliber secondary air nozzle (13) is arranged above a pulverized coal burner (12) in a pulverized coal combustion unit positioned at the top of the pulverized coal burner component (3), and a small-caliber air nozzle (14) is arranged below the pulverized coal burner; the upper part and the lower part of the pulverized coal burner (12) in the pulverized coal combustion unit positioned in the middle of the pulverized coal burner component (3) are provided with small-caliber air nozzles (14).
4. The system for controlling low-temperature combustion of eastern Junggar coal as claimed in claim 1, wherein: it still includes flow measuring device (4), expansion joint (5), gas circulation fan (7) and gas circulation baffle (11), flow measuring device (4), expansion joint (5), gas circulation fan (7) and gas circulation baffle (11) set gradually on circulation flue (6) from the front to the back.
5. The system for controlling low-temperature combustion of eastern Junggar coal as claimed in claim 4, wherein: the smoke circulating baffle (11) is positioned at the lower end of the smoke exhaust port (10).
6. The system for controlling low-temperature combustion of eastern Junggar coal as claimed in claim 1, wherein: the flue gas dust collector is characterized by further comprising a flue gas dust collector (8), wherein the flue gas dust collector (8) is installed on the tail flue (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920246560.3U CN209926346U (en) | 2019-02-27 | 2019-02-27 | east-Junggar coal low-temperature combustion control system |
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| CN201920246560.3U CN209926346U (en) | 2019-02-27 | 2019-02-27 | east-Junggar coal low-temperature combustion control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737389A (en) * | 2019-02-27 | 2019-05-10 | 哈尔滨锅炉厂有限责任公司 | A kind of quasi- eastern coal low-temperature burning control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737389A (en) * | 2019-02-27 | 2019-05-10 | 哈尔滨锅炉厂有限责任公司 | A kind of quasi- eastern coal low-temperature burning control system |
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