CN105020726A - Device for recovering hot air of dry type slag removal machine and reducing disorganized air leakage of bottom of hearth and application thereof - Google Patents
Device for recovering hot air of dry type slag removal machine and reducing disorganized air leakage of bottom of hearth and application thereof Download PDFInfo
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- CN105020726A CN105020726A CN201510448528.XA CN201510448528A CN105020726A CN 105020726 A CN105020726 A CN 105020726A CN 201510448528 A CN201510448528 A CN 201510448528A CN 105020726 A CN105020726 A CN 105020726A
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Abstract
The invention provides a device for recovering hot air of a dry type slag removal machine and reducing disorganized air leakage of the bottom of a hearth. The device comprises a suction pipeline, a cyclone separator, a suction fan, a control device, a ventilation bypass, a first control damper, a first isolation valve, a second control damper, a second isolation valve, a third control damper and a third isolation valve. The cyclone separator, the first control damper, the first isolation valve, the suction fan, the ventilation bypass, the second isolation valve and the second control damper are sequentially arranged on the suction pipeline from the inlet to the outlet. The third isolation valve and the third control damper are sequentially arranged on the ventilation bypass from the inlet to the outlet. A slag gate box is arranged at the bottom of the cyclone separator. By means of the device, the disorganized air leakage of the bottom of a furnace is changed to organized air supply, and the thermal efficiency of the furnace is improved to close to the optimum value; the flame center height of the hearth is controlled, temperature reduction water quantity of a superheater and a reheater is reduced, cocking which may happen to the platen superheater is reduced, NOx emission concentration is lowered, and remarkable comprehensive benefits to the unit are achieved.
Description
Technical field
The invention belongs to field of electrical equipment, particularly a kind of device reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out, also relate to a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out.
Background technology
Dry slag-removing machine enjoys well the attention of power industry with energy-conservation, water saving, environmental protection and comprehensive benefit, and current existing up to a hundred units have put into operation dry slag-removing machine.Dry slag-removing machine workflow: high temperature furnace slag is fallen on slag extractor conveyer belt through hearth deslagging door, utilize the negative pressure of burner hearth, cooled slag is carried out by sucking surrounding air, cold wind absorbs the laggard people's burner hearth of heat that the physical sensible heat of hot slag and slag combustible combustion discharge, and slag extractor operates under the high temperature conditions continuously.
Current, from dry slag-removing machine operation conditions, by the hot blast after cooling down high-temperature slag, its temperature export primary and secondary air wind-warm syndrome with air preheater compared with obviously on the low side, due to the existence of this part furnace bottom cooling air, will make to be reduced by the Secondary Air air quantity of air preheater, cause air preheater exchange capability of heat to decline, affect exhaust gas temperature to raise, this departs from its best boiler thermal output value by affecting boiler thermal output; Described best boiler thermal output refers to, both reclaims afterheat of slags, under ensureing again the condition that exhaust gas temperature does not raise, and the maximum boiler thermal output value that the boiler with dry slag-removing machine can reach.
The problem that current dry slag-removing machine ubiquity air leak rate of air curtain is higher, and significantly depart from the design load of air leak rate of air curtain 1%, part of generating units furnace bottom air leak rate of air curtain is more than 10%, even higher, higher furnace bottom air leak rate of air curtain, make to be reduced further by the Secondary Air air quantity of air preheater, make boiler thermal output off-target value farther, affect the economy of unit operation; Furnace bottom air leak rate of air curtain is higher, boiler formation of nitrogen oxides under height, middle load condition is increased, affects the emission control of nitrogen oxide, considerably increase operating cost; Meanwhile, all mix due to most of unit and burn economic coal, the equal off-design ature of coal of the ature of coal used, causes slag amount off-design value, affects furnace bottom air leak rate of air curtain and controls artificial increase, affect boiler thermal output and reduce.The increase of furnace bottom air leak rate of air curtain, not only affect boiler thermal output off-target boiler thermal output value, and can affect on furnace flame center and rise, furnace outlet gas temperature is caused to increase, superheater and reheater spray water flux increase, the possibility of pendant superheater coking increases, and affects the security of unit operation, economy.Therefore, for ensureing the safe and stable operation of boiler, need reduce and control the air leak rate of air curtain that dry slag-removing machine inorganization is leaked out.
This part hot blast entering burner hearth by dry slag-removing machine belongs to inorganization and leaks out, and affects in burner hearth and organizes burning normally, if this part inorganization can be leaked out become organized air-supply, so will be conducive to the normal operation of stove combustion operating mode.
Summary of the invention
Goal of the invention: in order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of device reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out, present invention also offers a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out.
Technical scheme: a kind of device reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out provided by the invention, comprises suction channel, cyclone separator, sucktion fan, control device, air bypass, the first damper, the first isolation door, the second damper, the second isolation door, the 3rd damper, the 3rd isolation door; Described suction channel sets gradually cyclone separator, the first damper, the first isolation door, sucktion fan, air bypass, the second isolation door, the second damper from entrance to outlet; Described air bypass sets gradually the 3rd isolation door, the 3rd damper from entrance to outlet; Slag lock case is provided with bottom described cyclone separator; Described control device is connected with the first damper, the first isolation door, the second damper, the second isolation door, the 3rd damper, the 3rd isolation door respectively, sucktion fan connects.
As improvement, also comprise insertion plate door, described insertion plate door is located between cyclone separator and slag lock case.
Present invention also offers a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out, comprise boiler furnace, dry slag-removing machine, flue, Secondary Air air channel, burner, air preheater, suction channel, cyclone separator, sucktion fan; Described dry slag-removing machine is located at bottom boiler furnace, and boiler furnace top is located at by described flue, and described Secondary Air air channel is by air preheater, burner and boiler furnace UNICOM; Described burner is connected with Secondary Air air channel with flue respectively; Described dry slag-removing machine is connected by suction channel with Secondary Air air channel, and described suction channel is provided with cyclone separator, sucktion fan successively, is provided with slag lock case bottom described cyclone separator.
As improvement, be provided with slag dropping tube between described dry slag-removing machine and boiler furnace, described suction channel is connected with slag dropping tube.
Improve as another kind, also comprise control device, air bypass, the first damper, the first isolation door, the second damper, the second isolation door, the 3rd damper, the 3rd isolation door; Described suction channel sets gradually cyclone separator, the first damper, the first isolation door, sucktion fan, air bypass, the second isolation door, the second damper from entrance to outlet; Described air bypass sets gradually the 3rd isolation door, the 3rd damper from entrance to outlet; Described control device is connected with the first damper, the first isolation door, the second damper, the second isolation door, the 3rd damper, the 3rd isolation door, sucktion fan respectively.
Improve as another kind, in described Secondary Air air channel, the entrance and exit place of suction channel outlet upstream, sucktion fan is respectively equipped with pressure and temperature checkout gear, and described pressure and temperature checkout gear is connected with control device.
Improve as another kind, also comprise insertion plate door, described insertion plate door is located between cyclone separator and slag lock case.
Improve as another kind, the porch of described suction channel is provided with filter.
Beneficial effect: the invention provides and reclaim dry slag-removing machine hot blast and reduce equipment that burner hearth bottom inorganization leaks out and furnace bottom inorganization is leaked out become organized air-supply, improve boiler thermal output, make it close to optimum value, reduce superheater and reheater spray water flux, alleviate the coking that pendant superheater may exist, reduce NOx emission concentration, to unit, there is obvious comprehensive benefit.
The invention provides and reclaim dry slag-removing machine hot blast and reduce equipment that burner hearth bottom inorganization leaks out and be operation for dry slag-removing machine and the technical scheme that designs, by the hot blast by burner hearth cooling down high-temperature slag, be recycled to Secondary Air air channel before air preheater, the higher problem of dry slag disposal machine air leakage rate will be solved completely, by fully reclaiming afterheat of slags, improve boiler thermal output; Becoming organized air-supply by furnace bottom inorganization being leaked out, by the combustion conditions greatly improved in stove, reducing flame kernel height, reducing superheater and reheater spray water flux, alleviate the possibility of pendant superheater coking, reducing the generation of NOx; By furnace bottom hot blast being delivered to Secondary Air air channel before air preheater, Secondary Air wind-warm syndrome can be improved, improve air preheater cold junction integrated temperature, alleviate the generation of cold end corrosion, if system is with steam air heater, steam air heater steam consumption quantity can be reduced, all in all, reclaim the equipment complex remarkable benefit that dry slag-removing machine hot blast reduces burner hearth bottom inleakage.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention reclaims that dry slag-removing machine hot blast reduces the equipment that burner hearth bottom inorganization is leaked out.
Fig. 2 is the partial structurtes schematic diagram that the present invention reclaims that dry slag-removing machine hot blast reduces the equipment that burner hearth bottom inorganization is leaked out.
Detailed description of the invention
Reclaim the equipment that dry slag-removing machine hot blast reduction burner hearth bottom inorganization is leaked out, see Fig. 1 and Fig. 2, comprise boiler furnace 1, dry slag-removing machine 2, flue 3, Secondary Air air channel 4, burner 5, air preheater 6, suction channel 7, cyclone separator 8, sucktion fan 9, slag lock case 10, control device 12, air bypass 13, first damper 14, first isolation door 15, second damper 16, second isolation door 17, the 3rd damper 18, the 3rd isolation door 19, insertion plate door 20; Dry slag-removing machine 2 to be located at bottom boiler furnace 1 and to be connected by slag dropping tube 11, and boiler furnace 1 top is located at by flue 3, and Secondary Air air channel 4 is by air preheater 6, burner 5 and boiler furnace 1 UNICOM; Burner 5 is connected with Secondary Air air channel 4 with flue 3 respectively; Slag dropping tube 11 is connected by suction channel 7 with Secondary Air air channel 4, and suction channel 7 sets gradually cyclone separator 8, first damper 14, first isolation door 15, sucktion fan 9, air bypass 13, second isolation door 17, second damper 16 from entrance to outlet; Air bypass 13 sets gradually the 3rd isolation door 19, the 3rd damper 18 from entrance to outlet; Be provided with slag lock case 10 bottom cyclone separator 8, between cyclone separator 8 and slag lock case 10, be provided with insertion plate door 20; Control device 12 is connected with the first damper 14, first isolation door 15, second damper 16, second isolation door 17, the 3rd damper 18, the 3rd isolation door 19 respectively, sucktion fan 9 connects.Interior, suction channel 7 outlet upstream, sucktion fan 9 entrance and exit place, Secondary Air air channel 4 is respectively equipped with pressure and temperature checkout gear, and pressure and temperature checkout gear is connected with control device 12.The porch of suction channel 7 is provided with filter.
The operation logic of this equipment:
(1) aspirate the hot blast after making cooling down high-temperature slag by sucktion fan 9 and enter suction channel 7, porch can arrange slag granules filter in order to initial gross separation hot blast in the slag granules of carrying, reduce the carrying amount of dust granules in hot blast, prevent bulky grain slag from affecting sucktion fan 9 safe operation; Suction channel 7 is arranged in dry slag-removing machine bilateral symmetry, to balance combustion chamber draft, can arrange pressure and temperature checkout gear in suction channel 7 porch.
(2) hot blast entering suction channel 7 is introduced into cyclone separator 8, and after inertial separation, hot blast enters sucktion fan 9 from cyclone separator 8 upper outlet, and the slag granules separated, enter the slag lock case 10 of cyclone separator 8 bottom.Sucktion fan sends after hot blast boosting into the Secondary Air air channel 4 before air preheater 6, and be balance sucktion fan 9 outlet pressure, the upstream entering Secondary Air air channel 4 place at hot blast can arrange pressure-measuring-point, pours in down a chimney into dry slag-removing machine to avoid the air quantity in Secondary Air air channel.Maintaining the pressure balance of Secondary Air air channel and dry slag-removing machine when air bypass 13 is for starting, avoiding the fluctuation affecting combustion chamber draft.When isolation door is used for avoiding system malfunctions, Secondary Air pours in down a chimney into dry slag-removing machine.
In system starting process, first the first isolation door 15 is opened, then open the 3rd isolation door 19, start sucktion fan 9 simultaneously, and adjust the first damper 14 and the 3rd damper 18; When sucktion fan outlet pressure is higher than Secondary Air duct pressure, first open the second isolation door 17 entering Secondary Air air channel 4, then the second damper 16 entering Secondary Air air channel 4 is opened again, close the 3rd isolation door 19 and the 3rd damper 18 simultaneously, set up the pressure balance from dry slag-removing machine 2 to Secondary Air air channel 4 like this, system can normally be put into operation, avoid in initial start stage, because Secondary Air duct pressure is high, the cold wind in air channel is made to pour in down a chimney into dry slag-removing machine 2, and enter burner hearth 1, affect furnace pressure fluctuation.
In system operation, owing to aspirating the hot blast of dry slag-removing machine 2, likely affect combustion chamber draft, for this reason, relevant measuring point can be set to ensure the stable of combustion chamber draft: by combustion chamber draft signal access control apparatus 12, when combustion chamber draft generation larger fluctuation, or when combustion chamber draft exceedes certain numerical value, or the fluctuation of furnace hopper inlet pressure is larger, pressure exceedes certain numerical value, or system oxygen amount measuring point depart from normal value larger time, reduce the rotating speed of sucktion fan 9, adjustment fans entrance regulates the aperture of the first damper 14, reduce hot blast aspiration, maintain combustion chamber draft, if unit MFT action, then sucktion fan 9 trips, and isolation door and damper are all closed, if one-sided sucktion fan 9 breaks down, cause tripping operation, this side isolation door and damper are closed rapidly, avoid Secondary Air anti-channeling to enter dry slag-removing machine 2, opposite side operational system suitably reduces sucktion fan 9 rotating speed simultaneously, avoids affecting in stove occurring negative pressure deviation, if sucktion fan 9 frequency conversion is broken down, then adjust rapidly the first damper 14, avoid, because pressure increases instantaneously, affecting combustion chamber draft.
With Guohua Xuzhou Power Generation Co., Ltd. 1000MW unit for research object, calculate with regard to the impact of dry slag disposal machine air leakage rate on boiler thermal output, when air leak rate of air curtain rises to 2.80% by 1.79%, affect boiler thermal output and decline about 0.30 percentage point; When furnace bottom hydraulic shutoff door is closed, under the condition fully reclaiming afterheat of slags, boiler thermal output height when its boiler thermal output is 1.79% compared with air leak rate of air curtain about 0.4 percentage point, namely by fully reclaiming the hot blast of dry slag-removing machine, the inorganization as far as possible reducing furnace bottom is leaked out, be conducive to improving boiler thermal output, and if furnace bottom inorganization inleakage is larger, then the economy by fully reclaiming dry slag-removing machine hot blast is better.
By reclaiming the hot blast of dry slag-removing machine, can reduce furnace bottom inleakage, control flame kernel and rise, reduce superheater and reheater spray water flux, the height of its economy is relevant to the actual operating state of unit.For Guo electricity Changzhou electricity generating corporation, Ltd 600MW unit, this unit is after wet slag removal changes pnenmatic slag handling, reheated steam spray water flux adds about 15t/h, this equipment if put into operation, can effectively reduce furnace bottom to leak out, calculate with reheating spray water flux decline 7.5t/h, net coal consumption rate can be reduced and be about 0.23g/kWh.
When furnace bottom hydraulic shutoff door is closed, significantly will reduce furnace bottom inorganization to leak out, effectively can reduce the operation oxygen amount of main burner lower layer region, reduce the generation of nitrogen oxide, for Guo electricity Dong Sheng power & light company 330MW unit, under 315MW load, when furnace bottom hydraulic shutoff door is closed, nitrogen oxide is from 350mg/m
3drop to 280mg/m
3, have dropped about 20%, and by reclaiming the hot blast of dry slag-removing machine, reduce furnace bottom inorganization to leak out, its effect is similar to the effect that furnace bottom hydraulic shutoff door is closed, the same concentration that can reduce nitrogen oxide under high, middle load, control polluted articles discharges, and reduces operating cost.
By reclaiming the hot blast of dry slag-removing machine, air preheater entrance Secondary Air wind-warm syndrome can be improved, by calculating, for 600MW unit, under full capacity, can improve Secondary Air wind-warm syndrome and be about 3-4 DEG C, if when the quantity of slag is larger, its temperature rise amplitude also has certain rising space, this is for the unit with steam air heater, by being conducive to the consumption reducing high-temperature steam when Secondary Air wind side steam air heater puts into operation, reducing unit hear rate, improving the economy of unit operation.
This equipment needs two sucktion fans that put into operation, although these two sucktion fans need to consume certain power consumption, but compared with above-mentioned income, this system can effectively reduce furnace bottom inorganization and leak out, abundant recovery afterheat of slags, boiler thermal output is made to approach its optimum value, furnace bottom inorganization is leaked out to become and leaks out in a organized way, control flame kernel rises, optimize hearth combustion operating mode, reduce superheater and reheater spray water flux, alleviate the coking that pendant superheater may exist, reduce NOx emission concentration, there is significant integrated application benefit.
Claims (8)
1. reclaim the device that dry slag-removing machine hot blast reduction burner hearth bottom inorganization is leaked out, it is characterized in that: comprise suction channel (7), cyclone separator (8), sucktion fan (9), control device (12), air bypass (13), the first damper (14), the first isolation door (15), the second damper (16), the second isolation door (17), the 3rd damper (18), the 3rd isolation door (19); Described suction channel (7) sets gradually cyclone separator (8), the first damper (14), the first isolation door (15), sucktion fan (9), air bypass (13), the second isolation door (17), the second damper (16) from entrance to outlet; Described air bypass (13) sets gradually the 3rd isolation door (19), the 3rd damper (18) from entrance to outlet; Described cyclone separator (8) bottom is provided with slag lock case (10); Described control device (12) is connected with the first damper (14), the first isolation door (15), the second damper (16), the second isolation door (17), the 3rd damper (18), the 3rd isolation door (19), sucktion fan (9) respectively.
2. a kind of device reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out according to claim 1, it is characterized in that: also comprise insertion plate door (20), described insertion plate door (20) is located between cyclone separator (8) and slag lock case (10).
3. reclaim the equipment that dry slag-removing machine hot blast reduction burner hearth bottom inorganization is leaked out, it is characterized in that: comprise boiler furnace (1), dry slag-removing machine (2), flue (3), Secondary Air air channel (4), burner (5), air preheater (6), suction channel (7), cyclone separator (8), sucktion fan (9); Described dry slag-removing machine (2) is located at boiler furnace (1) bottom, boiler furnace (1) top is located at by described flue (3), and described Secondary Air air channel (4) is by air preheater (6), burner (5) and boiler furnace (1) UNICOM; Described burner (5) is connected with Secondary Air air channel (4) with flue (3) respectively; Described dry slag-removing machine (2) is connected by suction channel (7) with Secondary Air air channel (4), described suction channel (7) is provided with successively cyclone separator (8), sucktion fan (9), described cyclone separator (8) bottom is provided with slag lock case (10).
4. a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out according to claim 3, it is characterized in that: be provided with slag dropping tube (11) between described dry slag-removing machine (2) and boiler furnace (1), described suction channel (7) is connected with slag dropping tube (11).
5. a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out according to claim 3, is characterized in that: also comprise control device (12), air bypass (13), the first damper (14), the first isolation door (15), the second damper (16), the second isolation door (17), the 3rd damper (18), the 3rd isolation door (19); Described suction channel (7) sets gradually cyclone separator (8), the first damper (14), the first isolation door (15), sucktion fan (9), air bypass (13), the second isolation door (17), the second damper (16) from entrance to outlet; Described air bypass (13) sets gradually the 3rd isolation door (19), the 3rd damper (18) from entrance to outlet; Described control device (12) is connected with the first damper (14), the first isolation door (15), the second damper (16), the second isolation door (17), the 3rd damper (18), the 3rd isolation door (19), sucktion fan (9) respectively.
6. a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out according to claim 5, it is characterized in that: described Secondary Air air channel (4) is interior, the entrance and exit place of suction channel (7) outlet upstream, sucktion fan (9) is respectively equipped with pressure and temperature checkout gear, and described pressure and temperature checkout gear is connected with control device (12).
7. a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out according to claim 3, it is characterized in that: also comprise insertion plate door (20), described insertion plate door (20) is located between cyclone separator (8) and slag lock case (10).
8. a kind of equipment reclaiming dry slag-removing machine hot blast reduction burner hearth bottom inorganization and leak out according to claim 3, is characterized in that: the porch of described suction channel (7) is provided with filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510448528.XA CN105020726B (en) | 2015-07-28 | 2015-07-28 | It is a kind of to reclaim device and its application that dry slag-removing machine hot blast reduction burner hearth bottom inorganization is leaked out |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510448528.XA CN105020726B (en) | 2015-07-28 | 2015-07-28 | It is a kind of to reclaim device and its application that dry slag-removing machine hot blast reduction burner hearth bottom inorganization is leaked out |
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| CN105020726A true CN105020726A (en) | 2015-11-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906549A (en) * | 2017-11-08 | 2018-04-13 | 上海锅炉厂有限公司 | A kind of station boiler displacement furnace bottom leaks out the system for reducing air preheater exhaust gas temperature |
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| EP0252967B1 (en) * | 1986-01-10 | 1989-08-23 | MAGALDI, Mario | Apparatus for continuous dry removal of bottom ash |
| CN202040832U (en) * | 2011-04-19 | 2011-11-16 | 山东电力研究院 | Connecting system of regenerative air preheater air leakage recycling device and dry-type slag removal machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906549A (en) * | 2017-11-08 | 2018-04-13 | 上海锅炉厂有限公司 | A kind of station boiler displacement furnace bottom leaks out the system for reducing air preheater exhaust gas temperature |
| CN107906549B (en) * | 2017-11-08 | 2024-01-30 | 上海锅炉厂有限公司 | System for reducing exhaust gas temperature of air preheater by replacing furnace bottom air leakage of power station boiler |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210000 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Address before: 210000 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. |