CN105650656A - Boiler bottom structure of submerged scraper conveyor in thermal power plant - Google Patents
Boiler bottom structure of submerged scraper conveyor in thermal power plant Download PDFInfo
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- CN105650656A CN105650656A CN201610173045.8A CN201610173045A CN105650656A CN 105650656 A CN105650656 A CN 105650656A CN 201610173045 A CN201610173045 A CN 201610173045A CN 105650656 A CN105650656 A CN 105650656A
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- slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a boiler bottom structure of a submerged scraper conveyor in a thermal power plant. A transitional slag pit and a boiler bottom deslagging device are arranged between a boiler and the submerged scraper conveyor, and a boiler bottom is sealed between the boiler and the transitional slag pit through a mechanical sealing device. The boiler bottom deslagging device comprises hydraulic shutoff doors which all horizontally move during opening or closing. The mechanical sealing device absorbs expansion displacement of the boiler and seals the boiler bottom at the same time, the problems that the water level of a water seal tank cannot be controlled easily and periodical cleaning is needed are solved, and the hydraulic shutoff doors can be flexibly opened and closed, can serve as isolation doors and can effectively achieve pre-cooling and pre-crushing of large slag blocks. A system is safe and reliable, operation is easy, running is convenient, and the functions of large slag pre-crushing and temporary storage, non-stop overhaul of the submerged scraper conveyor and slag water ultralimit high-temperature protection of the submerged scraper conveyor are achieved.
Description
[technical field]
The present invention relates to the deslagging technique fields such as pulverized coal fired boiler, in particular to a kind of fuel-burning power plant submerged slag conveyor bottom construction.
[background technology]
At present, during row's slag employing submerged slag conveyor such as domestic and international pulverized coal fired boiler, hearth deslagging mainly contains following several mode:
Mode one: be provided with transition slag well between submerged slag conveyor and boiler, has water sealed tank to seal between transition slag well and boiler lower collecting box, and water sealed tank is arranged along slag well surrounding, maintains the water level in groove and the sealing of slag well by the sealing water of continuous overflow. Transition slag down-hole is provided with hydraulic shutoff door, and hydraulic shutoff door, by swing mode opening and closing, is vertically arranged when opening, and insertion submerged slag conveyor groove body is as the water seal board of boiler, horizontally disposed during closedown, plays a part to close furnace bottom (transition slag well) slag-drip opening. Water seal mode is adopted between the transition slag well of this kind of mode and boiler, if controlling not good water sealed tank moisturizing, likely occur water sealed tank water level too low, lower than combustion chamber draft value, and cause water seal failure, generation furnace bottom leaks out, water sealed tank generally adopts continuous moisturizing to overflow to the mode of slag well, in slag well, this part moisturizing there occurs a large amount of evaporations because of radiation of burner hearth and convection current, in slag well, the water yield of evaporation accounts for the 1/3 of slag removing system water consumption, this kind of evaporation is to the few of effect of cooling of hot slag, and system water supplement waste is serious; Although being provided with skimming plate inside boiler water seal plate, but still having hot slag to fall in water sealed tank, causing accumulated slag fouling, it is necessary to regularly artificial blowdown and cleaning; When submerged slag conveyor needs not stop transport maintenance, need to close hydraulic shutoff door, hydraulic shutoff door is swing structure, although the effect of closedown can be played, but after its door-plate cuts out, gap is relatively big, and boiler leaks out more, also occurs that excessive slag falls in operation, breaking hydraulic shutoff door and fall into the situation in submerged slag conveyor groove body, hydraulic shutoff door is also dangerous after closing.
Mode two: adopting straight slotting mode between submerged slag conveyor and boiler, boiler carries sealing plate and directly inserts the submerged slag conveyor groove body water surface. this kind of mode does not have transition slag well, the temporary of slag and big slag crushing function cannot be realized, operation cannot enter submerged slag conveyor inside overhaul, below submerged slag conveyor groove body water level to upper Idler bearing must be reduced and just can carry out maintenance operation, boiler furnace sealing destroys because water level in submerged slag conveyor reduces, a large amount of freezing air bleeds, and once repeatedly occurs to cause bigger financial loss because submerged slag conveyor damage of water block causes boiler extinguishment unit tripping accident to power plant. when submerged slag conveyor runs, in groove body, slag water temperature maintains 50��70 DEG C, the high temperature of 80 DEG C then can be reached during boiler soot-blowing, situation about spattering outside slag water often occurs when hot slag falls in submerged slag conveyor, for the mode of connection of above-mentioned two kinds of boilers and submerged slag conveyor, in all can not avoiding running, the burnt hot slag of the big agllutination of several tons of weights directly falls in submerged slag conveyor groove from boiler furnace eminence, cause slag water in submerged slag conveyor that flash evapn occurs, slag water and steam outwards spatters, domestic once occurred repeatedly because big slag falls into the personal injury accident that submerged slag conveyor after heat water and steam leaks and causes.
[summary of the invention]
Solving the problem, the object of the invention is to provide a kind of good airproof performance, security height, effectively ensures the fuel-burning power plant submerged slag conveyor bottom construction of boiler air leak rate of air curtain.
In order to achieve the above object, the technical scheme of the present invention is as follows:
A kind of fuel-burning power plant submerged slag conveyor bottom construction, transition slag well and hearth deslagging device it is provided with between boiler and submerged slag conveyor, adopting between boiler and transition slag well at the bottom of mechanically-sealing apparatus Sealing furnace, hearth deslagging device comprises the hydraulic shutoff door opening or closing and being and move horizontally.
Further, described hearth deslagging device also comprise be arranged on below hydraulic shutoff door every grid.
Further, described hearth deslagging device bottom is inserted in submerged slag conveyor tank with water seal plate, water seal plate.
Further, described hydraulic shutoff door is provided with the profile of tooth extrusion head of broken big slag.
Further, described transition slag well adopts multiple interconnective V-type slag bucket, is equipped with hearth deslagging device below each V-type slag bucket.
Further, upper and lower two layers of vision slit, coke cleaning hole also it is provided with in each V-type slag bucket.
Further, big slag spraying temp. lowering apparatus also it is provided with in each V-type slag bucket.
Further, described big slag spraying temp. lowering apparatus comprises water spraying control valve, shower nozzle and the monitoring camera being arranged on water-supply line.
Further, establishing some water level gauges and thermometer in described submerged slag conveyor groove body, submerged slag conveyor also comprises the temperature signal of the two position signal according to water level gauge and thermometer to the electronic water compensating valve carrying out moisturizing in groove body.
Further, described is reticulated structure every grid, and hole dimension is not more than 300mm �� 300mm.
Compared with prior art, the present invention has the following advantages:
The fuel-burning power plant submerged slag conveyor bottom construction of the present invention, transition slag well and hearth deslagging device it is provided with between boiler and submerged slag conveyor, it is provided with mechanically-sealing apparatus, the effect simultaneously playing furnace bottom sealing of absorption boiler expansion displacement between transition slag well and boiler water wall lower collecting box sealing plate. Hydraulic shutoff door opens or closes state and is and moves horizontally, and tightness, security, reliability are greatly improved. Hydraulic shutoff door switch is flexible, the effect of isolating door can be played, can effectively realize again pre-cooled, fragmentation in advance to big clinker, when have big clinker drop on protection on grid, there is no a fragmentation time, by operation hydraulic shutoff door door-plate, big slag is extruded, until big slag fragmentation falls into submerged slag conveyor, the burnt hot slag of the big agllutination of several tons of weights in running is avoided directly to fall in submerged slag conveyor groove from boiler furnace eminence.
Further, the protection of hearth deslagging device can prevent the whereabouts of big slag from causing the impact fracture of equipment every grid structure effectively, slagging prevention is to the damage of residue extraction machine, prevent the generation that big slag falls into submerged slag conveyor and causes slag water and steam to leak, the surging force of protection when the big slag that grid can bear 3 tons heavy falls into from boiler furnace 70 meters of eminences.
Further; hearth deslagging device has water seal plate; in insertion submerged slag conveyor tank; boiler seal is ensured during operation; do not leak out from boiler bottom and enter; the degree of depth that water seal board length meets the water seal board insertion submerged slag conveyor groove body water surface is greater than boiler pressure protection value, and when boiler such as blasts at the accident, submerged slag conveyor water seal height ensures that slag water can not leak. When needs change submerged slag conveyor carrying roller, bearing or need enter slag downhole overhaul time, hydraulic shutoff door can be closed and reduce submerged slag conveyor water level or emptying, it is possible to can not submerged slag conveyor be overhauled blowing out when ensureing personal security.
Further, transition slag well adopts multiple interconnective V-type slag bucket, is equipped with hearth deslagging device below each V-type slag bucket; When clinker hot in slag well occur soft state hydraulic shutoff door cannot attrition crushing time, open the spraying temp. lowering apparatus of slag well inside, hot clinker is cooled, after the cooling of hot slag is hardening, recycling hydraulic shutoff door is broken to it, solves big slag not breakable problem when boiler uses the ature of coal that coking property is strong, softening temperature is lower.
Employing it is an advantage of the invention that, security of system is reliable, simple to operate, and it is convenient to run, and solves the wayward problem with needing periodic cleaning of water sealed tank water level, and slag well is dry slag well, decreases the vaporization losses of water coolant in slag well, and water-saving result is obvious; By arranging protective grille, can effectively prevent big slag from directly falling in submerged slag conveyor, simultaneously by the hydraulic shutoff door of the level switch of band squeeze function, realize the function that the fragmentation of big slag is temporary, after hydraulic shutoff door is closed, good airproof performance, security height, can effectively ensure boiler air leak rate of air curtain, boiler efficiency can not be affected because of submerged slag conveyor maintenance and fire-putting-out emergency occurs. When ultralimit high temperature 80 DEG C occurs in dragveyer slag water, hydraulic shutoff door can be closed and open electronic water compensating valve and realize slag water overtemperature protection function.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the present invention
In figure: submerged slag conveyor (1), mechanically-sealing apparatus (2), transition slag well (3), hydraulic shutoff door (4), every grid (5), water seal plate (6), water spraying control valve (7), shower nozzle (8), camera (9), water level gauge (10), electronic water compensating valve (11), thermometer (12).
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, transition slag well 3 and hearth deslagging device it is provided with between boiler and submerged slag conveyor 1. Adopting at the bottom of mechanically-sealing apparatus 2 Sealing furnace between transition slag well 3 and boiler water wall lower collecting box sealing plate, hearth deslagging device comprises the hydraulic shutoff door 4 opening or closing and being and move horizontally, and hydraulic shutoff door 4 is provided with the profile of tooth extrusion head of broken big slag. Mechanically-sealing apparatus 2 can meet the requirement that long-term safety is run, and bears burner hearth peak pressure, all directions displacement that absorption boiler expands and produces, and meets the mal-conditions such as boiler bottom high temperature, abrasion. Transition slag well 3 useful volume should be able to meet BMCR operating mode boiler more than 4 hours maximum bed drain purges, and its steel construction and refractory materials can bear the direct impact of big block slag. Transition slag well 3 arranges upper and lower two layers of vision slit, coke cleaning hole, can observe whole mechanically-sealing apparatus and extrusion head, grille network running condition.
Hearth deslagging device adopts independent support mode, form by every parts such as grid 5, hydraulic shutoff door 4, casing, drive element, shooting and monitoring system and hydraulic pressure pumping plant (containing pipeline) system, water seal plates 6, every the lower section of grid 5 at hydraulic shutoff door 4, slag discharging device bottom, the end is with water seal plate 6, and water seal plate 6 inserts in submerged slag conveyor tank. When big slag falls, falling and, on grid 5, can not directly impact submerged slag conveyor, grid is reticulated structure, and hole dimension is not more than 300mm �� 300mm. First big clinker is fallen on grid, obtains pre-cooled, then realizes extruding and pre-fragmentation by the profile of tooth extrusion head on hydraulic shutoff door 4 by moving horizontally, falls to subsequently in submerged slag conveyor 1 groove body. And when submerged slag conveyor and subsequent delivery system jam, can closing hydraulic shutoff door 4, extrusion head is closing up state, plays a part to close transition slag well 3, ensure that the air leak rate of air curtain of boiler does not affect boiler efficiency and boiler operatiopn, realize overhaul of the equipments when not blowing out.
Slag falls and shattering process, monitors by camera system. transition slag well 3 adopts multiple interconnective V-type slag bucket, is equipped with hearth deslagging device below each V-type slag bucket, also it is provided with the slag bucket inside of big slag spraying temp. lowering apparatus above each hearth deslagging device in each V-type slag bucket and big slag spraying temp. lowering apparatus is set, big slag spraying temp. lowering apparatus comprises the water spraying control valve 7 being arranged on water-supply line, shower nozzle 8 and monitoring camera 9, when by camera 9 observe extrusion head repeatedly extrude hot clinker cannot broken time, remote operation opens slag blowout water for cooling water lines water spraying control valve 7, by shower nozzle 8 to hot clinker water-spraying control, after the cooling of hot clinker is strengthened by the dark hardness of red stain, close slag blowout water for cooling water lines water spraying control valve, and then startup profile of tooth extrusion head carries out fragmentation.
Establishing some water level gauges 10 in submerged slag conveyor 1 groove body, submerged slag conveyor 1 also comprises the two position signal according to water level gauge 10 to the electronic water compensating valve 11 carrying out moisturizing in groove body. water seal plate 6 under hearth deslagging device inserts in submerged slag conveyor tank, water seal height meets the furnace pressure protection value requirement of boiler, when submerged slag conveyor water level is lower than water seal height, send guard signal, submerged slag conveyor carries out moisturizing, moisturizing is to ordinary water-level, release and report to the police, if water level is reported to the police and is not returned to ordinary water-level at the appointed time always, then close all hydraulic shutoff door, carry out trouble-locating and maintenance, until overhaul of the equipments relevant in system complete and submerged slag conveyor water level normal after, progressively open successively again and often organize hydraulic shutoff door, until all shutoff doors are all opened, submerged slag conveyor resumes operation.
Establishing some thermometers 12 in submerged slag conveyor 1 groove body, submerged slag conveyor 1 also comprises the temperature height low signal according to thermometer 12 to the electronic water compensating valve 11 carrying out moisturizing in groove body. When slag water temperature in groove body reaches the superelevation ultimate value 80 DEG C of setting, close all hydraulic shutoff door, open electronic water compensating valve 11 simultaneously and carry out moisturizing, electronic water compensating valve 11 is closed when slag water temperature is down to below 70 degree, then open the hydraulic shutoff door of first slag bucket, after the accumulated slag in this slag bucket is empty clearly, more progressively open the hydraulic shutoff door of next slag bucket successively by this, until shutoff door is all opened, submerged slag conveyor resumes operation.
Above example is that submerged slag conveyor arranges 3 V-type slag buckets, and actual engineering middle scraper dragveyer slag bucket number is 1��4, and embodiment is the same.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. Within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a fuel-burning power plant submerged slag conveyor bottom construction, it is characterized in that: between boiler and submerged slag conveyor (1), be provided with transition slag well (3) and hearth deslagging device, adopting at the bottom of mechanically-sealing apparatus (2) Sealing furnace between boiler and transition slag well (3), hearth deslagging device comprises the hydraulic shutoff door (4) opening or closing and being and move horizontally.
2. fuel-burning power plant according to claim 1 submerged slag conveyor bottom construction, it is characterised in that: described hearth deslagging device also comprise be arranged on hydraulic shutoff door (4) lower section every grid (5).
3. fuel-burning power plant according to claim 2 submerged slag conveyor bottom construction, it is characterised in that: described hearth deslagging device bottom is inserted in submerged slag conveyor tank with water seal plate (6), water seal plate (6).
4. fuel-burning power plant according to claim 1 submerged slag conveyor bottom construction, it is characterised in that: described hydraulic shutoff door (4) is provided with the profile of tooth extrusion head of broken big slag.
5. fuel-burning power plant according to claim 1 submerged slag conveyor bottom construction, it is characterised in that: described transition slag well (3) adopts multiple interconnective V-type slag bucket, is equipped with hearth deslagging device below each V-type slag bucket.
6. fuel-burning power plant according to claim 5 submerged slag conveyor bottom construction, it is characterised in that: also it is provided with upper and lower two layers of vision slit, coke cleaning hole in each V-type slag bucket.
7. fuel-burning power plant according to claim 5 submerged slag conveyor bottom construction, it is characterised in that: also it is provided with big slag spraying temp. lowering apparatus in each V-type slag bucket.
8. fuel-burning power plant according to claim 7 submerged slag conveyor bottom construction, it is characterised in that: described big slag spraying temp. lowering apparatus comprises water spraying control valve (7), shower nozzle (8) and the monitoring camera (9) being arranged on water-supply line.
9. fuel-burning power plant submerged slag conveyor bottom construction according to the arbitrary item of claim 1-8, it is characterized in that: establish some water level gauges (10) and thermometer (12) in described submerged slag conveyor (1) groove body, submerged slag conveyor (1) also comprises the temperature signal of the two position signal according to water level gauge (10) and thermometer (12) to the electronic water compensating valve (11) carrying out moisturizing in groove body.
10. fuel-burning power plant submerged slag conveyor bottom construction according to the arbitrary item of claim 1-8, it is characterised in that: described is reticulated structure every grid (5), and hole dimension is not more than 300mm �� 300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610173045.8A CN105650656A (en) | 2016-03-24 | 2016-03-24 | Boiler bottom structure of submerged scraper conveyor in thermal power plant |
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| CN201610173045.8A CN105650656A (en) | 2016-03-24 | 2016-03-24 | Boiler bottom structure of submerged scraper conveyor in thermal power plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413408A (en) * | 2018-05-03 | 2018-08-17 | 南通联振重工机械有限公司 | A kind of water replanishing device of waste incinerator fire-gate leakage slag structure for conveying |
| CN110056902A (en) * | 2019-04-03 | 2019-07-26 | 华电电力科学研究院有限公司 | A kind of system and its working method preventing wet type machinery slag-discharging boiler coke extinguishing |
| CN110822448A (en) * | 2019-09-17 | 2020-02-21 | 中国能源建设集团广东省电力设计研究院有限公司 | Sludge blending combustion system for dry-type slag extractor |
| CN112413636A (en) * | 2020-11-17 | 2021-02-26 | 湖南天欣科技股份有限公司 | Method for preventing coal powder combustion furnace from being exploded |
| CN115520987A (en) * | 2022-09-13 | 2022-12-27 | 华能曲阜热电有限公司 | Accumulated slag treatment device at tail part of scraper slag conveyor |
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| CN102954478A (en) * | 2012-12-12 | 2013-03-06 | 中国电力工程顾问集团华东电力设计院 | Air-water combined cooling dry slagging method and system of pulverized coal boiler |
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| CN104949140A (en) * | 2015-06-11 | 2015-09-30 | 山东电力建设第一工程公司 | Power station boiler screw deslagging device and mounting method |
| CN205664402U (en) * | 2016-03-24 | 2016-10-26 | 中国电力工程顾问集团西北电力设计院有限公司 | Thermal power factory scraper blade drags for sediment machine furnace bear building -up to be constructed |
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2016
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| AU1691683A (en) * | 1982-07-16 | 1984-01-19 | Combustion Engineering Inc. | Remote dewatering scraper conveyor |
| CN201476032U (en) * | 2009-08-21 | 2010-05-19 | 北京国电龙源环保工程有限公司 | Mechanical slag removal device of pulverized-coal boiler |
| CN201561434U (en) * | 2009-12-31 | 2010-08-25 | 李芝春 | Hydraulic shutoff door device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413408A (en) * | 2018-05-03 | 2018-08-17 | 南通联振重工机械有限公司 | A kind of water replanishing device of waste incinerator fire-gate leakage slag structure for conveying |
| CN110056902A (en) * | 2019-04-03 | 2019-07-26 | 华电电力科学研究院有限公司 | A kind of system and its working method preventing wet type machinery slag-discharging boiler coke extinguishing |
| CN110056902B (en) * | 2019-04-03 | 2023-11-28 | 华电电力科学研究院有限公司 | System for preventing wet mechanical slag discharging boiler from burning off and extinguishing fire and working method thereof |
| CN110822448A (en) * | 2019-09-17 | 2020-02-21 | 中国能源建设集团广东省电力设计研究院有限公司 | Sludge blending combustion system for dry-type slag extractor |
| CN112413636A (en) * | 2020-11-17 | 2021-02-26 | 湖南天欣科技股份有限公司 | Method for preventing coal powder combustion furnace from being exploded |
| CN115520987A (en) * | 2022-09-13 | 2022-12-27 | 华能曲阜热电有限公司 | Accumulated slag treatment device at tail part of scraper slag conveyor |
| CN115520987B (en) * | 2022-09-13 | 2024-05-28 | 华能曲阜热电有限公司 | Tail accumulated slag treatment device of scraper slag conveyor |
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Application publication date: 20160608 |