CN212481341U - Improved boiler structure for solving air inlet problem at bottom of air-cooled dry slag extractor - Google Patents
Improved boiler structure for solving air inlet problem at bottom of air-cooled dry slag extractor Download PDFInfo
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- CN212481341U CN212481341U CN202021092822.4U CN202021092822U CN212481341U CN 212481341 U CN212481341 U CN 212481341U CN 202021092822 U CN202021092822 U CN 202021092822U CN 212481341 U CN212481341 U CN 212481341U
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Abstract
The utility model relates to a solve boiler improvement structure of forced air cooling dry-type slag extractor stove bottom air inlet problem, there are a plurality of sediment fill below the boiler, the sediment fill has a lateral wall, its bottom is the cinder notch that falls, the dry-type slag extractor system is below the sediment fill, the boiler is provided with the secondary bellows, the secondary bellows connects the hot-blast female pipe of secondary, its characterized in that, set up at least one inlet scoop on the lateral wall of each sediment fill, each inlet scoop connects the branch pipe that induced drafts, each branch pipe that induced drafts gathers to the female pipe that induced drafts, the female pipe that induced drafts connects; the suction fan is also connected with an air outlet pipe, and the air outlet pipe is connected with a secondary hot air main pipe. The utility model discloses all set up the inlet scoop on every lateral wall of every cinder notch that falls, send the hot-blast main pipe of boiler secondary bellows that comes with dry-type slag extractor through the fan, and then get into furnace as the overgrate air, realize that inorganization is leaked out for organizing the air inlet.
Description
Technical Field
The utility model relates to a furnace bottom ash slag treatment machine of coal-fired power plant field boiler, especially solve boiler improvement structure of forced air cooling dry-type slag extractor stove bottom air inlet problem.
Background
In the field of coal-fired power stations, furnace bottom ash treatment machines of boilers mainly comprise two types, namely a water-immersed scraper slag conveyor and an air-cooled dry slag extractor.
The water immersion type scraper slag conveyor cools slag through cooling water and is provided with a cooling water treatment and supplement system.
The dry slag extractor is connected with a slag outlet of the boiler through a slag well, the negative pressure of a hearth of the boiler is used for sucking cooling air, slag is cooled to about 100 ℃, and the slag enters the slag crusher and is conveyed to a slag bin for storage through a bucket elevator.
Compare wet-type scraper blade dragveyer system, dry-type deslagging system advantage is showing:
1) the cooling air brings the heat of the bottom slag back to the hearth, and the recovery of the heat loss of the discharged slag is realized.
2) The hot slag is cooled by air, the system is simple, and water resources are saved;
3) the ash residue keeps activity without hydrolysis, thus being more beneficial to the comprehensive utilization of the ash residue;
4) the wet slag removal system is finished by wet slag, the wet slag is frozen in the outward transportation in severe cold areas, and the dry slag removal system has no problem and is widely applied in areas.
The air inlets of the dry slag extractor are arranged at the two sides and the head of the body, and are provided with adjusting devices for controlling the air inlet quantity, and the maximum cooling air quantity is required to be not more than 1% of the total combustion air quantity under the corresponding working conditions of the boiler in design. However, in actual operation, due to uncertainty of boiler slag falling amount (related to factors such as soot blower action, coal quality fluctuation, flame height and the like), change of boiler load, fluctuation of furnace negative pressure and inaccuracy of slag temperature measurement, the amount of air entering a furnace through a dry slag system is far larger than 1%, generally more than 3% and even higher, and the air intake of the furnace bottom is higher along with reduction of boiler load.
In the design of a boiler, wind entering a hearth through a burner is called organized inlet wind. Burners are generally classified into a primary air burner and a secondary air burner, and overfire air is also generally considered as secondary air. The air entering the hearth through other types is called unorganized air inlet and comprises furnace bottom air leakage, hearth air leakage, tail flue air leakage and the like.
At a certain load, the total amount of air required for boiler combustion is determined. The boiler combustion needs reasonable distribution of primary air and secondary air to ensure safe, stable and economic operation. If unorganized air intake is increased, organized primary air volume and organized secondary air volume are reduced, and the momentum ratio of primary air and secondary air deviates from the normal range, so that the efficiency of the boiler is reduced, the concentration of nitrogen oxides is increased, and the safe and reliable operation of the boiler is endangered.
For a bituminous coal boiler, the primary air rate requirement is not high, and the tolerance for unorganized air leakage is high. For lignite boilers, particularly high-moisture lignite boilers, the requirement on the primary air rate is high, the secondary air rate is reduced, if the unorganized air inlet quantity is large, the secondary air rate is further reduced, and the momentum ratio of the primary air to the secondary air is unbalanced, so that the safe operation of the boiler is endangered.
The furnace bottom air leakage of the dry-type slag extractor system is the largest unorganized air leakage item, and the proportion of unorganized air leakage is increased along with the reduction of the load of the boiler. This is the biggest problem with dry slag extractor systems, which is especially pronounced in high moisture lignite boilers, where a significant proportion of lignite utility boilers are forced to choose wet slag extractor systems.
In the conventional dry slag extractor system, cooling air entering the dry slag extractor exchanges heat with hot slag, and then enters a hearth through a slag well to participate in boiler combustion as unorganized air. In practice, cooling air entering the dry slag extractor is difficult to effectively control along with the load and the slag falling amount of the boiler, so that the air amount leaking from the bottom of the boiler is large, and the operation economy and the safety of the boiler are influenced.
Therefore, the problem of unorganized air intake of the dry slag extractor system is a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide an improved boiler structure for solving the problem of air intake at the bottom of an air-cooled dry slag extractor.
The technical means adopted by the utility model are as follows.
A improved structure of a boiler for solving the problem of air inlet at the bottom of an air-cooled dry slag extractor is characterized in that a plurality of slag buckets are arranged below the boiler, each slag bucket is provided with a side wall, the bottom of each slag bucket is provided with a slag falling port, a dry slag extraction system is arranged below each slag bucket, the boiler is provided with a secondary air box, and the secondary air box is connected with a secondary hot air main pipe;
the suction fan is also connected with an air outlet pipe, and the air outlet pipe is connected with a secondary hot air main pipe.
Each air suction branch pipe is provided with a manual stop valve; the main air suction pipe is provided with an electric shutoff door and an electric adjusting door on the air inlet side of the suction fan; the air outlet pipe is arranged at the air outlet side of the suction fan and is provided with an electric shutoff door.
The connection position of the air outlet pipe and the secondary hot air main pipe is close to the secondary air box.
The utility model has the advantages that: an air suction opening is formed in each side wall of each slag falling opening, hot air from the dry slag extractor is delivered to a primary air box pipe of the boiler through a fan and then enters a hearth as secondary air, and unorganized air leakage is achieved as organized air inlet.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
Referring to fig. 1, the utility model discloses a solve boiler improvement structure of air-cooled dry slag extractor stove bottom air inlet problem, current boiler 1 below sets up the sediment well, and the sediment well has a plurality of sediment fill 2, and sediment fill 2 has lateral wall 21, and its bottom is for falling sediment mouth 22, and sediment fill 2 below is dry-type slag removal system 3, and boiler 1 is provided with secondary bellows 4, and secondary bellows 4 connects the hot-blast female pipe 5 of secondary, and this is current structure. The key point of the scheme is that at least one air suction opening 6 is arranged on the side wall 21 of each slag bucket 2, each air suction opening 6 is connected with an air suction branch pipe 7, each air suction branch pipe 7 is collected to an air suction main pipe 8, the air suction main pipe 8 is connected with an air suction fan 9, and the air suction fan is an existing mature high-temperature fan; the suction fan 9 is also connected with an air outlet pipe 10, and the air outlet pipe 10 is connected with the secondary hot air main pipe 5.
Each branch suction pipe 7 is provided with a manual stop valve 71 for shutting off and matching the air flow between each path; the main air suction pipe 8 is provided with an electric shutoff door 81 and an electric adjusting door 82 at the air inlet side of the suction fan 9; the air outlet pipe 10 is provided with an electric shutoff door 81 at the air outlet side of the suction fan 9. These valves can be operated to open or close as required.
The connection position A of the air outlet pipe 10 and the secondary hot air main pipe 5 is preferably close to the secondary air box 4 of the boiler 1 body as much as possible so as to reduce the resistance of a fan system.
When the dry-type slag extractor moves, the utility model discloses synchronous operation will get into the cooling air of dry-type slag extractor and take out from the furnace bottom, and the wind temperature of exhaust opening department generally is about 300 ℃, sends into the overgrate air combustor through the main pipe of overgrate air, has realized that dry-type slag extractor system unorganized leaks out for organizing the air inlet.
The utility model provides a dry-type slag extractor unorganized problem that leaks out greatly, when keeping its advantage, further extended dry-type slag extractor's application scope, more be favorable to boiler unit safe economic reliable operation.
Claims (3)
1. A improved structure of a boiler for solving the problem of air inlet at the bottom of an air-cooled dry slag extractor is characterized in that a plurality of slag buckets are arranged below the boiler, each slag bucket is provided with a side wall, the bottom of each slag bucket is provided with a slag falling port, a dry slag extraction system is arranged below each slag bucket, the boiler is provided with a secondary air box, and the secondary air box is connected with a secondary hot air main pipe;
the suction fan is also connected with an air outlet pipe, and the air outlet pipe is connected with a secondary hot air main pipe.
2. The improved structure of the boiler for solving the problem of air intake at the bottom of the air-cooled dry type slag extractor as claimed in claim 1, wherein each air intake branch pipe is provided with a manual stop valve; the main air suction pipe is provided with an electric shutoff door and an electric adjusting door on the air inlet side of the suction fan; the air outlet pipe is arranged at the air outlet side of the suction fan and is provided with an electric shutoff door.
3. The improved boiler structure for solving the problem of air intake at the bottom of the air-cooled dry slag extractor as claimed in claim 1, wherein the connection position of the air outlet pipe and the secondary hot air main pipe is close to the secondary air box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021092822.4U CN212481341U (en) | 2020-06-12 | 2020-06-12 | Improved boiler structure for solving air inlet problem at bottom of air-cooled dry slag extractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021092822.4U CN212481341U (en) | 2020-06-12 | 2020-06-12 | Improved boiler structure for solving air inlet problem at bottom of air-cooled dry slag extractor |
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| Publication Number | Publication Date |
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| CN212481341U true CN212481341U (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021092822.4U Active CN212481341U (en) | 2020-06-12 | 2020-06-12 | Improved boiler structure for solving air inlet problem at bottom of air-cooled dry slag extractor |
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| CN (1) | CN212481341U (en) |
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- 2020-06-12 CN CN202021092822.4U patent/CN212481341U/en active Active
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