CN215489650U - Full-combustion quasi-east coal 660MW efficient ultra-supercritical opposed combustion boiler - Google Patents
Full-combustion quasi-east coal 660MW efficient ultra-supercritical opposed combustion boiler Download PDFInfo
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- CN215489650U CN215489650U CN202121936337.5U CN202121936337U CN215489650U CN 215489650 U CN215489650 U CN 215489650U CN 202121936337 U CN202121936337 U CN 202121936337U CN 215489650 U CN215489650 U CN 215489650U
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Abstract
A full-combustion Todong coal 660MW high-efficiency ultra-supercritical opposed firing boiler relates to the technical field of Todong coal high-alkali coal. The utility model solves the problems of serious coking and contamination when the existing boiler burns the eastern Junggar coal. The periphery of a hearth is surrounded by a water-cooled wall, a screen type superheater group is arranged in a radiation area at the upper part of the hearth, a high-temperature superheater is arranged above a flame folding angle of the hearth, a high-temperature reheater is arranged in a horizontal flue of a boiler, a low-temperature reheater is arranged in a front flue of the tail part of the boiler, a low-temperature superheater and an economizer are sequentially arranged in a rear flue of the tail part from top to bottom, a denitration device is arranged at an outlet of the tail flue, an air preheater is arranged at an outlet of the denitration device, the cyclone burner group adopts a front-wall and rear-wall opposite-firing mode, four first cyclone burner layers are sequentially arranged on a front wall of the boiler from top to bottom, and three second cyclone burner layers are sequentially arranged on a rear wall of the boiler from top to bottom. The utility model is used for realizing large-proportion or full combustion of the eastern Junggar coal.
Description
Technical Field
The utility model relates to the technical field of high-alkali coal of east China coal, in particular to a 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning east China coal.
Background
The reserve capacity of the east China coal field is nearly 3900 hundred million tons, the east China coal field is the largest integral coal field discovered in China at present, and the east China coal is developed and utilized and has important significance for promoting the national and regional economic development. According to the conventional coal quality characteristics, the eastern Junggar coal is excellent coal for power. However, compared with other serious slagging coal types in China, the eastern Junggar coal has Na in ash2High content of O and CaO, SiO2And Al2O3Low content, high ash fusion temperature, etc. The actual burning condition shows that burning eastern Junggar coal causes serious pollution, slag bonding and corrosion problems, and continuous, safe and stable operation of the unit is influenced.
When the boilers of a plurality of power plants in Xinjiang burn the Dongdong coal, all heating surfaces from a hearth to an air preheater area are subjected to slagging and contamination with different degrees when the proportion of the Dongdong coal is too high, a steam soot blower cannot clear away the coke slag formed by burning the Dongdong coal, the water-cooled wall of a cold ash bucket is damaged frequently, the operation fault of a slag removal system is caused, a flue is blocked, and the boilers are forced to stop when the proportion of the Dongdong coal is too high. The east-west coal has great harm to the safe operation of the unit equipment, so the east-west coal can not be burnt completely, and the proportion of the east-west coal mixed burning in the pulverized coal boiler is lower than 50 percent.
The reserve of the low-sodium coal in the east China is not more than 20 hundred million tons, which is only equal to 0.5 percent of the reserve of the high-alkali coal in east China, the resource existence can not be matched with the reserve of the east China, and the reserve of the low-sodium coal can not meet the requirement of large-scale development of the east China coal according to the minimum proportion of 10 to 20 percent of the low-sodium coal blended in the existing unit. Therefore, the development of the key technology of the eastern Junggar coal-fired boiler and the realization of the operation of the boiler for fully burning eastern Junggar coal are necessary ways for the large-scale development and utilization of the eastern Junggar coal.
In summary, the prior art boilers have suffered from severe coking and fouling problems when burning eastern Junggar coal.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of serious coking and contamination when the conventional boiler burns the Dongdong coal, and further provides a 660MW full-combustion efficient ultra-supercritical opposed firing boiler.
The technical scheme of the utility model is as follows:
a660 MW high-efficiency ultra-supercritical opposed firing boiler fully burning eastern Junggar coal comprises a hearth 1, a screen type superheater group 2, a high-temperature superheater 3, a low-temperature superheater 4, an economizer 5, a high-temperature reheater 6, a low-temperature reheater 7, a cyclone burner group 8, an air preheater 9 and a denitration device 10, wherein the boiler adopts a pi-shaped arrangement mode, the section of the hearth 1 of the boiler is rectangular, the periphery of the hearth 1 is surrounded by a water-cooled wall, the screen type superheater group 2 is arranged in a radiation area at the upper part of the hearth 1, the high-temperature superheater 3 is arranged above a flame folding angle of the hearth 1, the high-temperature reheater 6 is arranged in a horizontal flue of the boiler, the low-temperature reheater 7 is arranged in a front tail flue of the boiler, the low-temperature superheater 4 and the economizer 5 are sequentially arranged in a rear tail flue of the boiler from top to bottom, the denitration device 10 is arranged at an outlet of the tail flue of the boiler, the air preheater 9 is arranged at an outlet of the denitration device 10, cyclone burner group 8 adopts front and back wall hedging combustion mode, cyclone burner group 8 includes four first cyclone burner layers and three second cyclone burner layer, four first cyclone burner layers set gradually on the front wall of boiler from top to bottom, every first cyclone burner layer includes a plurality of front wall cyclone burners, three second cyclone burner layer sets gradually on the back wall of boiler from top to bottom, and three second cyclone burner layer aligns with the first cyclone burner layer of lower three-layer respectively, every second cyclone burner layer includes a plurality of back wall cyclone burners.
Furthermore, the water-cooled walls surrounding the periphery of the hearth 1 comprise an upper water-cooled wall and a lower water-cooled wall, the upper water-cooled wall adopts a vertical tube coil water-cooled wall, the lower water-cooled wall adopts a spiral tube coil water-cooled wall, and the upper water-cooled wall and the lower water-cooled wall are connected and transited by adopting a middle header.
Further, the platen superheater group 2 comprises two platen superheaters, the two platen superheaters are oppositely arranged from front to back, the transverse distance between the two platen superheaters is larger than 1m, and the distance between the two platen superheaters is 800-900 mm.
Further, the middle of the high-temperature superheater 3 is pulled apart by 800-900 mm.
Further, it still includes two disconnect-type after-combustion air layers 11, all is equipped with disconnect-type after-combustion air layer 11 on the front wall of first cyclone burner layer top and the back wall of second cyclone burner layer top, and every disconnect-type after-combustion air layer 11 includes a plurality of disconnect-type after-combustion air spouts.
Further, the boiler comprises six hydraulic soot blower layers 14 and a plurality of wall type steam soot blower layers 12, wherein the three hydraulic soot blower layers 14 are sequentially arranged on the front wall and the rear wall water cooling wall of the boiler from top to bottom respectively, each hydraulic soot blower layer 14 comprises a plurality of hydraulic soot blowers, the wall type steam soot blower layers 12 are sequentially arranged on the two side wall water cooling walls of the boiler from top to bottom respectively, and each wall type steam soot blower layer 12 comprises a plurality of wall type steam soot blowers.
Further, the steam soot blower comprises a plurality of long telescopic steam soot blower layers 13, the plurality of long telescopic steam soot blower layers 13 are sequentially arranged on the periphery of the upper part of the boiler from top to bottom, and each long telescopic steam soot blower layer 13 comprises a plurality of long telescopic steam soot blowers.
Further, the inlet and the outlet of the screen type superheater group 2 adopt double headers, and the inlet and the outlet of the high-temperature superheater group 3 adopt single headers.
Further, the main steam pressure of the boiler is between 28 and 30MPa, the main steam temperature is 605 ℃, and the reheat steam temperature is 610 ℃ and 620 ℃.
Further, the high-temperature reheater 6 is of a W-shaped structure.
Compared with the prior art, the utility model has the following effects:
the utility model overcomes the defects of the prior art, the boiler adopts a pi-shaped arrangement and a swirl burner opposite-impact combustion mode, selects lower cross-section heat load and volume heat load, reasonably selects wall surface heat load and burnout height of a burner area, selects lower screen bottom smoke temperature and hearth outlet smoke temperature, enlarges the distance of the burners, adopts larger transverse distance of a heating surface, effectively solves the coking and contamination problems of the eastern Junggar coal burning boiler, adopts a hydraulic soot blower and steam soot blower combined soot blowing mode, solves the problem that the eastern Junggar coal burning needs to be mixed and burned, realizes large-proportion or full-burning of the eastern Junggar coal, plays a key role in large-scale development and utilization of the eastern Junggar coal, and improves economic benefit and sustainable development of a power plant.
Drawings
FIG. 1 is a front view of a 660MW high-efficiency ultra-supercritical opposed-combustion boiler fully burning Tortoise coal according to the present invention;
fig. 2 is a cross-sectional view at a-a of fig. 1.
Detailed Description
The first embodiment is as follows: the embodiment is described by combining fig. 1 and fig. 2, the 660MW high-efficiency ultra-supercritical opposed firing boiler fully burning eastern Junggar coal of the embodiment comprises a hearth 1, a screen type superheater group 2, a high-temperature superheater 3, a low-temperature superheater 4, an economizer 5, a high-temperature reheater 6, a low-temperature reheater 7, a cyclone burner group 8, an air preheater 9 and a denitration device 10, the boiler adopts a pi-shaped arrangement mode, the section of the hearth 1 of the boiler is rectangular, the periphery of the hearth 1 is surrounded by a water wall, the screen type superheater group 2 is arranged in a radiation area at the upper part of the hearth 1, the high-temperature superheater 3 is arranged above a flame folding angle of the hearth 1, the high-temperature reheater 6 is arranged in a horizontal flue of the boiler, the low-temperature reheater 7 is arranged in a front flue at the tail part of the boiler, the low-temperature superheater 4 and the economizer 5 are sequentially arranged in a rear flue at the tail part of the boiler from top to bottom, the tail flue outlet of the boiler is provided with the denitration device 10, air heater 9 has been arranged to denitrification facility 10 export, wall offset combustion mode around cyclone burner group 8 adopted, cyclone burner group 8 includes four first cyclone burner layers and three second cyclone burner layer, four first cyclone burner layers set gradually on the front wall of boiler from top to bottom, every first cyclone burner layer includes a plurality of front wall cyclone burners, three second cyclone burner layer sets gradually on the back wall of boiler from top to bottom, and three second cyclone burner layer aligns with lower three-layer first cyclone burner layer respectively, every second cyclone burner layer includes a plurality of back wall cyclone burners.
The distance between two adjacent first cyclone burner layers and two adjacent second cyclone burner layers of the embodiment is larger than 5m, and the burnout height is larger than 27 m. The cyclone burner 8 adopts three layers of a front wall and a rear wall respectively, and can also adopt four layers of a front wall, a three layer rear wall and a four layer rear wall.
The second embodiment is as follows: the embodiment is described with reference to fig. 1 and 2, the water walls surrounding the furnace 1 of the embodiment include an upper water wall and a lower water wall, the upper water wall adopts a vertical tube coil water wall, the lower water wall adopts a spiral tube coil water wall, and the upper water wall and the lower water wall are connected and transitioned by an intermediate header. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 1 and fig. 2, the platen superheater group 2 of the embodiment includes two platen superheaters, the two platen superheaters are oppositely arranged from front to back, the transverse distance of the platen superheaters is greater than 1m, and the middle of each platen superheater is separated by 800-900 mm. So set up, adopted great heating surface lateral separation, effectively solved the coking of burning with the eastern Junggar coal boiler and stained the problem, realized burning eastern Junggar coal entirely. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 and 2, and the high temperature superheater 3 of the present embodiment is spaced apart by 800 to 900 mm. So set up, adopted great heating surface lateral separation, effectively solved the coking of burning with the eastern Junggar coal boiler and stained the problem, realized burning eastern Junggar coal entirely. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 and fig. 2, and the embodiment further includes two separated over-fire air layers 11, the front wall above the first cyclone burner layer and the rear wall above the second cyclone burner layer are both provided with the separated over-fire air layers 11, and each separated over-fire air layer 11 includes a plurality of separated over-fire air nozzles. So set up, inside disconnect-type after-fire air got into the boiler from disconnect-type after-fire air spout. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
The sixth specific implementation mode: the embodiment is described with reference to fig. 1 and 2, and the embodiment further includes six hydraulic soot blower layers 14 and a plurality of wall steam soot blower layers 12, three hydraulic soot blower layers 14 are sequentially arranged on the front wall and the rear wall water-cooled wall of the boiler from top to bottom, each hydraulic soot blower layer 14 includes a plurality of hydraulic soot blowers, a plurality of wall steam soot blower layers 12 are sequentially arranged on the two side wall water-cooled walls of the boiler from top to bottom, and each wall steam soot blower layer 12 includes a plurality of wall steam soot blowers. According to the arrangement, the blowing areas of the hydraulic soot blower layers 14 are conical surfaces with 45 degrees respectively at the upper part, the lower part and the left part and the right part, the maximum range can reach more than 30m, the water consumption is larger as the range is longer, three layers of hydraulic soot blowers are respectively arranged on the front wall and the rear wall of the hearth for reducing the range so as to reduce the water consumption, 4 hydraulic soot blowers are arranged on each layer, 12 hydraulic soot blowers are arranged on each layer, and the total hearth area can be covered. And a plurality of layers of wall type steam soot blowers are arranged on the water cooling walls of the two side walls and are used as supplements of the hydraulic soot blower. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: the embodiment is described with reference to fig. 1 and 2, and further includes a plurality of long telescopic steam soot blower layers 13, the plurality of long telescopic steam soot blower layers 13 are sequentially arranged on the periphery of the upper part of the boiler from top to bottom, and each long telescopic steam soot blower layer 13 includes a plurality of long telescopic steam soot blowers. According to the arrangement, at least three long telescopic steam soot blower layers 13 are arranged in the areas of the screen type superheater group 2, the high-temperature superheater 3, the low-temperature superheater 4, the economizer 5, the high-temperature reheater 6 and the low-temperature reheater 7, the blowing ranges are mutually crossed, and heating surfaces of all levels of superheaters, reheaters and economizers are fully covered. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.
The specific implementation mode is eight: the present embodiment will be described with reference to fig. 1 and 2, and the platen superheater group 2 of the present embodiment employs a double header for the inlet and outlet and a single header for the inlet and outlet of the high-temperature superheater 3. So set up, through computational analysis, adopt this kind of connected mode can reduce working medium flow deviation, improve wall temperature homogeneity. Other compositions and connection relationships are the same as those of embodiment one, two, three, four, five, six or seven.
The specific implementation method nine: the present embodiment is described with reference to fig. 1 and fig. 2, the main steam pressure of the boiler of the present embodiment is between 28 MPa and 30MPa, the main steam temperature is 605 ℃, and the reheat steam temperature is 610 ℃ and 620 ℃. Other compositions and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh or eighth embodiment.
The detailed implementation mode is ten: the present embodiment will be described with reference to fig. 1 and 2, and the high-temperature reheater 6 of the present embodiment is of a W-shaped configuration. So set up, high temperature reheater 6 adopts W type structure, can increase the heating area, increases eastern Junggar coal adaptability. Other compositions and connections are the same as those of the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth embodiments.
Principle of operation
The working principle of the fully-burned Dongdong coal 660MW efficient ultra-supercritical opposed combustion boiler is described by combining the following figures 1 and 2: the steam-water flow of the boiler is that feed water enters a water-cooled wall through an economizer 5, a steam-water separator is introduced after passing through the water-cooled wall, working medium at an outlet of the steam-water separator is introduced into a header at an inlet of a ceiling pipe through a connecting pipe, passes through a ceiling pipe and a tail wrapping wall system, enters a low-temperature superheater 4, passes through a screen type superheater group 2 and a high-temperature superheater 3, and is finally sent to a high-pressure cylinder of a steam turbine through a main steam pipeline. The reheated steam enters a high-temperature reheater 6 after passing through a low-temperature reheater 7 and is sent to a steam turbine intermediate pressure cylinder through a pipeline. The flue gas flow is that the high temperature flue gas that the burning produced flows out from furnace 1 upper portion, passes through screen superheater group 2, high temperature superheater 3 and high temperature reheater 6 in proper order, later divide into two parts, and partly low temperature reheater 7 of flue before the afterbody flows through, and another part flows through low temperature superheater 4 and the economizer 5 of flue after the afterbody, then two parts flue gas merge once more after flue lower part baffle and become one way, flow through denitrification facility 10 and air heater 9 again, flow out the boiler scope from air heater 9 outlet flue at last.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a high-efficient ultra supercritical opposed firing boiler of 660MW of quandong coal of full combustion which characterized in that: the boiler comprises a hearth (1), a screen type superheater group (2), a high-temperature superheater (3), a low-temperature superheater (4), an economizer (5), a high-temperature reheater (6), a low-temperature reheater (7), a cyclone burner group (8), an air preheater (9) and a denitration device (10), wherein the boiler adopts a pi-shaped arrangement mode, the section of the hearth (1) of the boiler is rectangular, the periphery of the hearth (1) is surrounded by a water-cooled wall, the screen type superheater group (2) is arranged in a radiation area at the upper part of the hearth (1), the high-temperature superheater (3) is arranged above a flame folding angle of the hearth (1), the high-temperature reheater (6) is arranged in a horizontal flue of the boiler, the low-temperature reheater (7) is arranged in a front tail flue of the boiler, the low-temperature superheater (4) and the economizer (5) are sequentially arranged in a rear tail flue of the boiler from top to bottom, the denitration device (10) is arranged at a tail outlet of the boiler, air heater (9) have been arranged in denitrification facility (10) export, wall offset combustion mode around cyclone burner group (8) adopted, cyclone burner group (8) are including four first cyclone burner layers and three second cyclone burner layer, four first cyclone burner layers set gradually on the front wall of boiler from top to bottom, every first cyclone burner layer includes a plurality of front wall cyclone burner, three second cyclone burner layer sets gradually on the back wall of boiler from top to bottom, and three second cyclone burner layer aligns with lower three-layer first cyclone burner layer respectively, every second cyclone burner layer includes a plurality of back wall cyclone burner.
2. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 1, wherein: the water-cooled wall surrounding the periphery of the hearth (1) comprises an upper water-cooled wall and a lower water-cooled wall, the upper water-cooled wall adopts a vertical tube coil water-cooled wall, the lower water-cooled wall adopts a spiral tube coil water-cooled wall, and the upper water-cooled wall and the lower water-cooled wall are connected and transited by adopting a middle header.
3. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 2, wherein: the screen type superheater group (2) comprises two screen type superheaters, the two screen type superheaters are oppositely arranged from front to back, the transverse distance between the two screen type superheaters is larger than 1m, and the distance between every two screen type superheaters is 800-900 mm.
4. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 3, wherein: the middle of the high-temperature superheater (3) is pulled apart by 800-900 mm.
5. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 4, wherein: it still includes two disconnect-type after-combustion air layers (11), all is equipped with disconnect-type after-combustion air layer (11) on the front wall of first cyclone burner layer top and the back wall of second cyclone burner layer top, and every disconnect-type after-combustion air layer (11) include a plurality of disconnect-type after-combustion air spouts.
6. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 5, wherein: it still includes six water conservancy soot blower layers (14) and a plurality of wall formula steam soot blower layer (12), sets gradually three water conservancy soot blower layer (14) from top to bottom on the front wall of boiler and the back wall water-cooling wall respectively, and every water conservancy soot blower layer (14) include a plurality of water conservancy soot blowers, sets gradually a plurality of wall formula steam soot blower layers (12) from top to bottom on the both sides wall water-cooling wall of boiler respectively, and every wall formula steam soot blower layer (12) include a plurality of wall formula steam soot blowers.
7. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 6, wherein: the boiler is characterized by further comprising a plurality of long telescopic steam soot blower layers (13), wherein the plurality of long telescopic steam soot blower layers (13) are sequentially arranged on the periphery of the upper portion of the boiler from top to bottom, and each long telescopic steam soot blower layer (13) comprises a plurality of long telescopic steam soot blowers.
8. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 7, wherein: the inlet and the outlet of the screen type superheater group (2) adopt double headers, and the inlet and the outlet of the high-temperature superheater (3) adopt single headers.
9. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 8, wherein: the main steam pressure of the boiler is between 28 and 30MPa, the main steam temperature is 605 ℃, and the reheat steam temperature is 610 ℃ and 620 ℃.
10. The 660MW high-efficiency ultra-supercritical opposed firing boiler for fully burning eastern Junggar coal as claimed in claim 9, wherein: the high-temperature reheater (6) adopts a W-shaped structure.
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| CN202121936337.5U CN215489650U (en) | 2021-08-18 | 2021-08-18 | Full-combustion quasi-east coal 660MW efficient ultra-supercritical opposed combustion boiler |
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| CN202121936337.5U CN215489650U (en) | 2021-08-18 | 2021-08-18 | Full-combustion quasi-east coal 660MW efficient ultra-supercritical opposed combustion boiler |
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