CN209524532U - It is a kind of to use high sodium coal burning boiler system with low temperature heating surface - Google Patents
It is a kind of to use high sodium coal burning boiler system with low temperature heating surface Download PDFInfo
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- CN209524532U CN209524532U CN201822080446.6U CN201822080446U CN209524532U CN 209524532 U CN209524532 U CN 209524532U CN 201822080446 U CN201822080446 U CN 201822080446U CN 209524532 U CN209524532 U CN 209524532U
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Abstract
The utility model discloses a kind of to use high sodium coal burning boiler system with low temperature heating surface, including boiler back end ductwork and the high temperature superheater being arranged in boiler back end ductwork, low temperature heating surface and convection heating surface, wherein, high temperature superheater, low temperature heating surface and convection heating surface are sequentially distributed along the direction that flue gas circulates；The low temperature heating surface includes low temperature heating surface pipe, the deashing piece being socketed on low temperature heating surface pipe and the driving device for driving deashing piece to rotate, low temperature heating surface pipe is set in boiler back end ductwork, which can effectively to use high sodium coal burning boiler from low temperature heating surface slagging dust stratification, the problem of steam temperature deficiency.
Description
Technical field
The utility model relates to one kind to use high sodium coal burning boiler system, and in particular to a kind of using with low temperature heating surface
High sodium coal burning boiler system.
Background technique
390,000,000,000 tons of Xinjiang eastern Junggar coalfield prognostic reserves, at present 213,600,000,000 tons of actual proved reserves.
Minerals in coal is the general name of all inorganic substances other than moisture removal, mainly based on Si, Al, Fe, Ca, Mg,
Supplemented by the elements such as Na, K compound composition, these inorganic mineral elements coal thermal transition utilize during be cause slagging,
The essential element of dust stratification.Quasi- east coal sodium content high (2-12%) be cause quasi- eastern coal during boiler uses easy dust stratification,
The main reason for slagging is that quasi- eastern coal opens up the bottleneck utilized on a large scale.
Sodium generally mainly exists in the form of clay mineral, silicate, zeolite, rock salt, is present in the form of organic sometimes
In coal.(900 DEG C or more are commonly considered as) under high-temp combustion environment, and alkali metal and Inorganic are in freeze profile Cheng Rong
Melt ash or enter gas phase, is finally bonded on heating surface in the form of sodium vapor and flying dust, heat exchange efficiency is caused to reduce, block cigarette
Gas channel, or even cause heating surface heavy corrosion.If flue gas chilling is lower than 550 DEG C, alkali metal vapour is largely attached to winged
On ash particle, flying dust viscosity is significantly reduced, and will not be occurred the above problem again, will be made the operational reliability for using high sodium coal burning boiler
And availability significantly improves.
Therefore, if high sodium coal is utilized as steam coal burning conversion, research and development use the boiler low-temperature of high sodium coal by
Hot face and relevant key technology are current primary selections.
Trial has been carried out in terms of high sodium coal is as steam coal in the country, builds in quasi- east area and the area Xinjiang meter Dong
If use the coal-powder boiler and circulating fluidized bed boiler of high sodium coal, but there are problems that in running it is some be difficult to eradicate solution, letter
It states as follows:
1) water-cooling wall slagging.The frequent soot blowing of soot blower in furnace washes away water-cooling wall and causes water-cooling wall that booster is thinned, a large amount of larger
Clinker moment fall off, fall into furnace bottom water seal arrangement, cause water in water seal arrangement to be impacted, vaporize by red-hot cinder, largely
Steam causes hearth combustion to fluctuate and put out a fire.
2) high temperature superheater, high/low temperature reheater tube seriously corroded.And cause to leak, it has to largely change pipe.
3) high temperature superheater, high/low temperature reheater heating surface stain dust stratification, serious wear.Even if high temperature superheater pipe section
It is 200mm and 89mm respectively away from S1 and S2, high/low temperature reheater pipe pitch S1 and S2 are 100mm and 80.8mm respectively, are still had
Portions under heat face intertubular space is blocked completely.Simultaneously as convection heating surface largely blocks up ash, smoke corridor, flue gas punching are formed
Brush causes high temperature reheater, high/low temperature superheater wear and leakage.
4) because convection heating surface stains, dust stratification is serious, and design rating is not achieved in main, reheat steam temperature.
The above problem seriously restricts application of the high sodium coal as steam coal, develops a kind of practicable suitable for using
The low temperature heating surface and key equipment of high sodium coal burning boiler are extremely urgent.
The high sodium coal reserves in the U.S. is also very rich, is concentrated mainly on northern US.State university, Pennsylvania, B&W
The research and engineering in terms of last century the nineties have begun to high sodium coal clean utilization such as company and Southern Co., the U.S.
Demonstration work is much walked before China.State university, Pennsylvania is directed generally to sodium preservation in coal, generates and turn
Change the research and experiment in terms of mechanism；B&W company has made intensive studies using high sodium coal burning boiler design aspect, and develops
The 700MW coal-powder boiler of high sodium coal is used, for engineering mimoir in the northern state De Keta power plant, technical measures are to increase tail portion cigarette
Road size and convection heating surface tube spacing, and special soot blower is taken, mitigate the situation of convection heating surface contamination, slagging；The U.S.
Southern Co.'s exploitation devises gasification bed gasification furnace, is also accumulated from some design experiences in terms of high sodium coal gasification, by its design
The gasification bed gasification furnace for being built in China's Dongguan, Guangdong has not been put to operation.
It is external also in other pretreatments in addition to the research in terms of high sodium coal industrial utilization device, such as using water and right
Sodium has liquid (oxalic acid etc.) washing of high-affinity etc. to be studied, to occur physically or chemically to react at normal temperature
Remove the sodium in coal, these technologies all rest on laboratory research stage, not yet industrial application, on the one hand because technology not at
Ripe, more important reason is that production cost is too high.
The occurrence patterns of sodium are divided into two kinds in high sodium coal, another one is organic sodium in the outer water of coal or in hole
Kind is to crystallize sodium, and referred to as inorganic sodium, sodium can just discharge completely at 900 DEG C or more, can just lose viscosity at 550 DEG C or less.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the above-mentioned prior arts provides a kind of with low temperature heating surface
High sodium coal burning boiler system is used, which can effectively to use high sodium coal burning boiler from low temperature heating surface slagging dust stratification, vapour
Warm insufficient problem.
In order to achieve the above objectives, the high sodium coal burning boiler system that uses described in the utility model with low temperature heating surface includes
Boiler back end ductwork and the high temperature superheater being arranged in boiler back end ductwork, low temperature heating surface and convection heating surface, wherein
High temperature superheater, low temperature heating surface and convection heating surface are sequentially distributed along the direction that flue gas circulates；
The low temperature heating surface includes low temperature heating surface pipe, the deashing piece being socketed on low temperature heating surface pipe and for band
The driving device of dynamic deashing piece rotation, low temperature heating surface pipe are set in boiler back end ductwork.
Driving device is connected by deceleration mechanism and connecting component with deashing piece.
The deashing piece is helical structure.
The utility model has the following beneficial effects:
It is described in the utility model to use high sodium coal burning boiler system when specific operation with low temperature heating surface, boiler tail
Direction in portion's flue along flue gas circulation sets gradually high temperature superheater, low temperature heating surface and convection heating surface, by described low
Warm heating surface make flue-gas temperature rapidly by 700 DEG C or so be reduced to 550 DEG C hereinafter, so that low temperature heating surface outlet cigarette
Gas loses contamination, will not pollute again to downstream heating surface, in addition, the low temperature heating surface in the utility model includes low temperature
Heating surface tube, the deashing piece being socketed on low temperature heating surface pipe and the driving device for driving deashing piece to rotate, to make
The grey shell obtained in low temperature heating surface pipe outer wall is divided into multiple segments, to reduce the integral strength of grey shell, in deashing, leads to
Over-driving device drives deashing piece to rotate on low temperature heating surface pipe, so that grey shell fragmentation and falling, to realize that low temperature is heated
The ash disposal of facial canal avoids low temperature heating surface steam temperature too low, and structure is simple, and easy to operate, practicability is stronger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the installation site figure of deashing piece 8 in the utility model.
Wherein, 1 it is boiler back end ductwork, 2 be high temperature superheater, 3 be low temperature heating surface, 4 be convection heating surface, 5 is drive
Dynamic device, 6 be deceleration mechanism, 7 be connecting component, 8 be deashing piece, 9 be low temperature heating surface pipe.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing:
Referring to Figure 1 and Figure 2, the high sodium coal burning boiler system that uses described in the utility model with low temperature heating surface includes pot
Furnace back-end ductwork 1 and the high temperature superheater 2 being arranged in boiler back end ductwork 1, low temperature heating surface 3 and convection heating surface 4,
In, high temperature superheater 2, low temperature heating surface 3 and convection heating surface 4 are sequentially distributed along the direction that flue gas circulates；The low temperature is heated
Face 3 is including low temperature heating surface pipe 9, the deashing piece 8 being socketed on low temperature heating surface pipe 9 and for driving deashing piece 8 to rotate
Driving device 5, low temperature heating surface pipe 9 are set in boiler back end ductwork 1.
Driving device 5 is connected by deceleration mechanism 6 and connecting component 7 with deashing piece 8；The deashing piece 8 is spiral shape
Structure.
The utility model is passed through cooling water into low temperature heating surface pipe 9 when specific operation, fast by low temperature heating surface 3
Smoke temperature is down to 550 DEG C or less by 700 DEG C by speed.Being mainly characterized by for the utility model is covert in flying dust containing sodium and sodium vapor, i.e.,
The high region of flying dust viscosity rapidly reduces flue-gas temperature so that sodium ash concentration is bonded on low temperature heating surface 3, and low temperature by
It is socketed deashing piece 8 on low temperature heating surface pipe 9 in hot face 3, by the rotation of deashing piece 8, low temperature is bonded in fragmentation and removing
Grey shell on heating surface tube 9, so that the flue-gas temperature and viscosity after low temperature heating surface 3 significantly reduce, so that high
Sodium flue gas becomes as conventional flue gas, will not cause to stain to convection heating surface 4 again and pollute.
The technical characteristics of the utility model are as follows: 1) low temperature heating surface 3, the low temperature are arranged in boiler back end ductwork 1
Heating surface 3 will not again can impact subsequent thermal face again by high-temperature flue gas quickly cooling at the low-temperature flue gas for losing viscosity；2)
It is previously provided with deashing piece 8 on low temperature heating surface pipe 9 in low temperature heating surface 3, which is helical structure, passes through deashing
Grey shell is divided into many segments by piece 8 naturally, so that grey shell integral strength reduces, then passes through 8 spiral of deashing piece or straight again
Line moves back and forth can fragmentation and the grey shell of removing；The driving power of driving device 5 is divided into electronic, hydraulic-driven and pneumatic three kinds of sides
Formula, the grey shell fritter after fragmentation are fallen in the collection ash bucket of air preheater lower part by downstream heating surface, then periodic cleaning.
The utility model facilitates the exploitation of the high sodium coal in China and rationally utilizes, and facilitates high sodium coal as steam coal
Using facilitating the operation steady in a long-term of high sodium coal burning boiler, solve what high sodium coal was used as the safe long period of steam coal
Problem, the boiler improvement for using high sodium coal for having been formed design at present provide technique direction and guidance.
Claims (3)
1. a kind of use high sodium coal burning boiler system with low temperature heating surface, which is characterized in that including boiler back end ductwork (1) with
And it is arranged in high temperature superheater (2), low temperature heating surface (3) and convection heating surface (4) in boiler back end ductwork (1), wherein high
Warm superheater (2), low temperature heating surface (3) and convection heating surface (4) are sequentially distributed along the direction that flue gas circulates；
The low temperature heating surface (3) include low temperature heating surface pipe (9), the deashing piece (8) being socketed on low temperature heating surface pipe (9) with
And the driving device (5) for driving deashing piece (8) to rotate, low temperature heating surface pipe (9) are set in boiler back end ductwork (1).
2. according to claim 1 use high sodium coal burning boiler system with low temperature heating surface, which is characterized in that driving dress
(5) are set to be connected by deceleration mechanism (6) and connecting component (7) with deashing piece (8).
3. according to claim 1 use high sodium coal burning boiler system with low temperature heating surface, which is characterized in that described clear
Grey piece (8) is helical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822080446.6U CN209524532U (en) | 2018-12-11 | 2018-12-11 | It is a kind of to use high sodium coal burning boiler system with low temperature heating surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822080446.6U CN209524532U (en) | 2018-12-11 | 2018-12-11 | It is a kind of to use high sodium coal burning boiler system with low temperature heating surface |
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| CN209524532U true CN209524532U (en) | 2019-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109442462A (en) * | 2018-12-11 | 2019-03-08 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to use high sodium coal burning boiler system with low temperature heating surface |
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2018
- 2018-12-11 CN CN201822080446.6U patent/CN209524532U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109442462A (en) * | 2018-12-11 | 2019-03-08 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to use high sodium coal burning boiler system with low temperature heating surface |
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