CN100453903C - Method for cooling bottom dregs at fluid bed boiler - Google Patents
Method for cooling bottom dregs at fluid bed boiler Download PDFInfo
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- CN100453903C CN100453903C CNB2006100298726A CN200610029872A CN100453903C CN 100453903 C CN100453903 C CN 100453903C CN B2006100298726 A CNB2006100298726 A CN B2006100298726A CN 200610029872 A CN200610029872 A CN 200610029872A CN 100453903 C CN100453903 C CN 100453903C
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Abstract
A method for cooling bottom slag of fluidized bed boiler includes entering fluidized hot air from primary air preheater of boiler into air chamber at boiler bottom to be mixed with high temperature slag before hot air is sent to firepot, using separation unit under cloth air board to separate out fine particles from hot air absorbed with heat of slag and sending them back to firepot by air cap of cloth air board, regulating flow rate of fluidized air and cooling air to cool down temperature of bottom slag to be 250-300deg.c then sending them on bottom slag conveying system.
Description
Technical field
The present invention relates to a kind of method of bottom dregs at fluid bed boiler cooling, belong to CFBB fluidization technique field.
Background technology
The end slag of fluidized-bed combustion boiler discharging is a kind of 0～10mm wide-size distribution, near the solid particle of 900 ℃ of high-temperatures, belong to the material of difficult operation and control, especially big capacity or big quantity of slag CFB boiler all do not have good solution both at home and abroad.Therefore, slag cooler belongs to one of the most thorny technological difficulties in the fluidized-bed combustion boiler accessory system.The spent-bed cooler of domestic introduction has caused very big economic loss owing to exist factors such as slagging scorification, boiler slag removal control inefficacy and slag cooler cooling heating surface wear to cause this slag cooler not reach problems such as expection cooling effect to power plant.And some mechanical type slag coolers, as water-cooled auger, water cold drum etc., owing to exist problems such as poorly sealed, that cooling capacity is poor, the repair and maintenance workload is big, application prospect is very unoptimistic at home.
From the CFB boiler operation situation more than the 100MW grade that has put into operation, one of subject matter that the CFB boiler exists is to remove slag system.The operation troubles of removing slag cooler in the slag system often causes the blowing out of unit accident, is perplexing the normal operation of power plant always.
China's CFBB uses the colm or even the gangue of high-sulfur, high ash at present, the boiler bottom quantity of slag is very big, use wind and water combined fluidized bed slag cooler and water-cooled slag cooler, end slag amount of stored heat is not basically by boiler recycling, cinder heat loss is big, cause boiler thermal output low, and water consumption is very big.
Summary of the invention
The objective of the invention is to invent slag good cooling results of a kind of end, improve the method for the bottom dregs at fluid bed boiler cooling of boiler thermal output.
For realizing above purpose, technical scheme of the present invention provides a kind of method of bottom dregs at fluid bed boiler cooling, it is characterized in that, utilizing a wind air preheater outlet of boiler fluidisation hot blast to advance the furnace bottom air compartment before entering burner hearth mixes with the high temperature warm sludge, at the bottom of the absorption of air after the slag accumulation of heat by behind the separator that is installed in the air distribution plate bottom fine grain circulating ash, uncompleted burned carbon and lime stone being sent back to burner hearth by grid plate hood, coarse granule after the separation forms end slag and is discharged by air compartment bottom slag-drip opening, and its method is:
At first the end slag of burner hearth emulsion zone passes through slag-transporting pipe, under the adjusting of control valve, enter air compartment, end slag under the effect of entrance guiding plate with an abundant mixed heat transfer of wind that enters air compartment by airduct, after carrying out heat exchange, one time hot blast enters burner hearth by separator and grid plate hood;
Then on the cold high pressure wind direction that comes out from the cooling air air compartment by scum pipe be deposited on the big slag of air compartment bottom and carry out heat exchange once more through an abundant mixed heat transfer of wind, end slag is cooled to below 250-300 ℃, and discharges by scum pipe;
All the other can not separatedly install the fine granular materials that is separated, and participate in circulating combustion comprising unburnt carbon granule, lime stone and bed material along with heat primary air enters burner hearth by the air grid plate hood.
Described a kind of bottom dregs at fluid bed boiler cooling system, comprise burner hearth, grid plate hood, air compartment and an airduct, grid plate hood is located at the lower end of burner hearth, be provided with air compartment at burner hearth bottom, be provided with an airduct that is connected with preheater in air compartment one side level, it is characterized in that, between burner hearth and air compartment, be provided with separator, the slag-transporting pipe that has control valve connects the upper end of burner hearth one side and an airduct, be provided with the entrance guiding plate in airduct upper end and slag-transporting pipe junction, be provided with scum pipe in the air compartment lower end, be provided with the cooling air air compartment in the scum pipe bottom.
The present invention utilizes a wind air preheater outlet of boiler fluidisation hot blast to mix with the high temperature warm sludge at the furnace bottom air compartment before entering burner hearth, at the bottom of the absorption of air after the slag accumulation of heat by behind the separator that is installed in the air distribution plate bottom fine grain circulating ash, uncompleted burned carbon and lime stone being sent back to burner hearth by grid plate hood, the coarse granule after the separation forms end slag and is discharged by air compartment bottom slag-drip opening.
Because the needed air mass flow of boiler combustion is more much bigger than the end quantity of slag that fuel combustion forms, for CFBB, a hot blast temperature is basically about 180-250 ℃, therefore when fluidisation air quantity of boiler accounts for boiler total blast volume 50% left and right sides, even boiler uses low-calorie gangue, end slag temperature is cooled to below 250-300 ℃, continue to cool off at scum pipe with cold wind, according to bed drain purge, regulate the flow of fluidized wind and cooling air, can be cooled to the end slag temperature of needs, directly enter end slag induction system.
Advantage of the present invention is:
1. end slag accumulation of heat can directly be reclaimed by boiler, improves boiler thermal output;
Because wind flow of boiler is far longer than boiler bottom slag flow, therefore utilize a fluidized wind of boiler air preheater outlet to cool off end slag, can make end slag be reduced to about 250-300 ℃ according to the boiler bottom quantity of slag and wind-warm syndrome degree of preheater outlet this moment, at cold wind of end slag outlet pipe section feeding or other high-head cold wind, the further temperature that end slag is cooled to require, fluidized wind and high-head cooling air absorb and enter burner hearth after the end slag accumulation of heat and burn, so the accumulation of heat of boiler bottom slag is directly by boiler recycling;
2. a large amount of fine grained, uncompleted burned carbon and unreacted limestone particles sent burner hearth back in the end slag, slag, the imperfect combustion carbon loss of flying dust machinery at the bottom of the reduction CFBB, the utilization rate of raising boiler lime stone;
3. end slag good cooling results, this system can use the situation of coal, a wind-warm syndrome degree according to engineering, and the flow of suitably regulating the high pressure cooling air can be cooled to a low-down level to end slag temperature, and air and end slag mix strong, heat exchange is abundant, and end slag cooling effect is very good;
4. system layout is simple, and slag cooling in the end is all carried out in an existing air compartment, and end slag is also directly discharged by scum pipe, and whole system is simple and reliable;
5, conserve water resource because this cold slag system cools off with the boiler air fully, does not need equipment such as a large amount of cooling waters and water treatment, system's reduced investment.
Description of drawings
Fig. 1 is a slag cooling system structure schematic diagram at the bottom of the CFBB;
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 1, be slag cooling system structure schematic diagram at the bottom of the CFBB, described bottom dregs at fluid bed boiler cooling system is made up of burner hearth 1, grid plate hood 2, slag-transporting pipe 3, separator 4, control valve 5, entrance guiding plate 6, air compartment 7, cooling air air compartment 8, scum pipe 9 and an airduct 10.
A kind of method of bottom dregs at fluid bed boiler cooling, utilizing a wind air preheater outlet of boiler fluidisation hot blast to advance the furnace bottom air compartment before entering burner hearth mixes with the high temperature warm sludge, at the bottom of the absorption of air after the slag accumulation of heat by behind the separator that is installed in the air distribution plate bottom fine grain circulating ash, uncompleted burned carbon and lime stone being sent back to burner hearth by grid plate hood, coarse granule after the separation forms end slag and is discharged by air compartment bottom slag-drip opening, and its method is:
At first the slag of burner hearth 1 emulsion zone is by slag-transporting pipe 3, under the adjusting of control valve 5, enter air compartment 7, the end slag that enters air compartment 7 under the effect of entrance guiding plate 6 with an abundant mixed heat transfer of wind that enters air compartment 7 by airduct 10, after carrying out heat exchange, one time hot blast enters burner hearth 1 by separator 4 and grid plate hood 2;
Then on the cold high pressure wind direction that comes out from cooling air air compartment 8 by scum pipe 9 be deposited on the big slag of air compartment 7 bottoms and carry out heat exchange once more through an abundant mixed heat transfer of wind, end slag is cooled to below 250-300 ℃, and discharges by scum pipe 9;
The fine granular materials that all the other can not separated device 4 be separated participates in circulating combustion comprising unburnt carbon granule, lime stone and bed material along with heat primary air enters burner hearth 1 by air grid plate hood 2.
Claims (2)
1. the method for bottom dregs at fluid bed boiler cooling, it is characterized in that, utilizing a wind air preheater outlet of boiler fluidisation hot blast to advance the furnace bottom air compartment before entering burner hearth mixes with the high temperature warm sludge, at the bottom of the absorption of air after the slag accumulation of heat by behind the separator that is installed in the air distribution plate bottom fine grain circulating ash, uncompleted burned carbon and lime stone being sent back to burner hearth by grid plate hood, coarse granule after the separation forms end slag and is discharged by air compartment bottom slag-drip opening, and its method is:
At first the slag of burner hearth (1) emulsion zone is by slag-transporting pipe (3), under the adjusting of control valve (5), enter air compartment (7), the end slag that enters air compartment (7) under the effect of entrance guiding plate (6) with an abundant mixed heat transfer of wind that enters air compartment (7) by an airduct (10), after carrying out heat exchange, one time hot blast enters burner hearth (1) by separator (4) and grid plate hood (2);
Then the cold high pressure wind direction that comes out from cooling air air compartment (8) by scum pipe (9) be deposited on the big slag of air compartment (7) bottom and carry out heat exchange once more through an abundant mixed heat transfer of wind, end slag is cooled to below 250-300 ℃, and discharges by scum pipe (9);
All the other can not separatedly install the fine granular materials that (4) are separated, and participate in circulating combustion comprising unburnt carbon granule, lime stone and bed material along with heat primary air enters burner hearth (1) by air grid plate hood (2).
2. a kind of bottom dregs at fluid bed boiler cooling system according to claim 1, comprise burner hearth (1), grid plate hood (2), an air compartment (7) and an airduct (10), grid plate hood (2) is located at the lower end of burner hearth (1), be provided with air compartment (7) in burner hearth (1) bottom, be provided with an airduct (10) that is connected with preheater in air compartment (7) one side levels, it is characterized in that, between burner hearth (1) and air compartment (7), be provided with separator (4), the slag-transporting pipe (3) that has control valve (5) connects the upper end of burner hearth (1) one side and an airduct (10), be provided with entrance guiding plate (6) in an airduct (10) upper end and slag-transporting pipe (3) junction, be provided with scum pipe (9) in air compartment (7) lower end, be provided with cooling air air compartment (8) in scum pipe (9) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100298726A CN100453903C (en) | 2006-08-10 | 2006-08-10 | Method for cooling bottom dregs at fluid bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100298726A CN100453903C (en) | 2006-08-10 | 2006-08-10 | Method for cooling bottom dregs at fluid bed boiler |
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| CN1916491A CN1916491A (en) | 2007-02-21 |
| CN100453903C true CN100453903C (en) | 2009-01-21 |
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| CNB2006100298726A Active CN100453903C (en) | 2006-08-10 | 2006-08-10 | Method for cooling bottom dregs at fluid bed boiler |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598334B (en) * | 2009-06-30 | 2010-12-08 | 上海锅炉厂有限公司 | Bottom slag cooling method of circulating fluidized bed |
| CN104566407A (en) * | 2010-09-15 | 2015-04-29 | 任振伟 | Waste heat recovery device and dry slagging boiler comprising waste heat recovery device |
| CN101949537B (en) * | 2010-09-19 | 2012-01-18 | 清华大学 | Circulating fluidized bed boiler bottom slag cooling system |
| CN102095197B (en) * | 2011-03-08 | 2012-08-22 | 中国华能集团清洁能源技术研究院有限公司 | Hearth of circulating fluidized bed boiler with bottom slag cooling and central air supply integrated design |
| CN102719579B (en) * | 2012-05-31 | 2013-12-18 | 四川川润股份有限公司 | Fluidized heat exchange device after slag of dry type granulating blast furnace |
| CN103968376B (en) * | 2013-02-06 | 2016-08-31 | 青岛顺德电力环保设备有限公司 | A kind of CFB Slag cooling technique |
| CN105953247B (en) * | 2016-05-30 | 2018-02-27 | 大唐贵州发耳发电有限公司 | A kind of big slag recycling system of boiler furnace |
| CN105910100A (en) * | 2016-06-13 | 2016-08-31 | 玖龙纸业（太仓）有限公司 | Air distribution and deslagging device of fluidized bed boiler and fluidized bed boiler |
| CN106195986B (en) * | 2016-08-28 | 2018-11-16 | 华电电力科学研究院 | W flame boiler waste heat utilization system with furnace bottom hot wind |
| CN107013904A (en) * | 2017-04-14 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of CFBB A types blast cap and its manufacture method |
| CN109539316B (en) * | 2018-11-16 | 2020-06-19 | 西安交通大学 | Low-volatile-component coal-fired environment-friendly energy-saving furnace |
| CN109340742B (en) * | 2018-11-27 | 2024-04-30 | 湖北金炉节能股份有限公司 | Novel fluidized bed flue gas furnace |
| CN112696666A (en) * | 2019-10-23 | 2021-04-23 | 北京中电长峰节能科技有限公司 | Hot slag energy and fine particle recovery system of circulating fluidized bed boiler |
| CN114234179B (en) * | 2021-12-22 | 2024-04-12 | 山西河坡发电有限责任公司 | Graded screening and recycling device for slag of circulating fluidized bed boiler |
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