CN103322560A - Roller type slag cooler for eliminating false cooling of ash slag - Google Patents
Roller type slag cooler for eliminating false cooling of ash slag Download PDFInfo
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- CN103322560A CN103322560A CN2012100715414A CN201210071541A CN103322560A CN 103322560 A CN103322560 A CN 103322560A CN 2012100715414 A CN2012100715414 A CN 2012100715414A CN 201210071541 A CN201210071541 A CN 201210071541A CN 103322560 A CN103322560 A CN 103322560A
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Abstract
The invention provides a roller type slag cooler for eliminating false cooling of ash slag, which is used in a high temperature ash slag cooling process of a circulating fluidized bed boiler. The device is divided into a radiation and heat exchange segment, a convection segment and a heat conduction segment along a drum shaft. The invention provides a roller type slag cooler for eliminating false cooling of ash slag, which starts from a heat transfer mechanism between particles and the device walls, and comprises processes for respectively cooling particles in the radiant segment, the convection segment and the heat conduction segment, especially by introducing an endothermic pool device. The roller type slag cooler for eliminating false cooling of ash slag overcomes a disadvantage of insufficient performance at an ash slag low temperature segment of a traditional slag cooler, can effectively increase cooling capability of the device, raises performance of the roller type slag cooler, shortens the length of a roller, can abalienate an inspection gallery occupied by the slag cooler for a boiler island.
Description
Technical field
The invention belongs to high-temperature powder cooling field, a kind of cold slag machine of Novel rotary drum of high-temperature ash of discharging for the cool cycles fluidized-bed combustion boiler is provided, by adopting the measure of eliminating lime-ash " false cold ", the high-temperature ash internal and external temperature is reached unanimity, it is cooled off thoroughly, greatly improve cooling effect.Also can be used as the energy, environmental protection, metallurgy, oil, the cooling device of the high-temperature powder that the commercial plant of the industrial circles such as chemical industry is discharged.
Background technology
The high-temperature ash that CFBB is discharged is carried a large amount of physics sensible heats, will cause huge energy dissipation as not recycling.Take the thermal power plant CFBB as example, if 300MW CFB Slag discharge capacity is 100t/h, these lime-ash are cooled to temperature a little more than environment by tapping temperature, boiler efficiency can improve 1%～2%, as the temperature when establishing lime-ash and leaving boiler is 1000 ℃, final deslagging temperature is 150 ℃, and the lime-ash physics sensible heat that then reclaims is amounted to 18190.37 tons of mark coal/a.Organize the recovery of high-temperature ash used heat and can receive considerable economic benefit.
Eliminate through technology competition and market, at present only two kinds of remaining fluidized bed slag cooler and barrel slag coolers.The former utilizes the fluid bed principle, and the physics sensible heat that the pipe laying heating surface absorbs high-temperature ash is set in fluid bed, the latter be utilize drum rotating make high-temperature ash periodically the water-cooling wall of contact roller tube inner surface emit the physics sensible heat.
The fluidized bed slag cooler that large circulating fluidized bed boiler uses is very responsive to particle size, will cause the slag cooler bed that collapses in case particle size surpasses design size, and then cause boiler shutdown, and economic loss is huge.Therefore, barrel slag cooler has obtained rapidly development, and its great advantage is to the particle size paralysis, as long as the particle that boiler can move can cool off in cylinder.The shortcoming of barrel slag cooler is that heat transfer coefficient is low, and cooling capacity is little, for satisfying the cooling requirement of boiler slag removal, must adopt the method that increases heat transfer area, owing to being subject to a series of technical limitations, conventional way is to strengthen barrel slag cooler length at present.The inconvenience that this has not only caused the normal operation of boiler and maintenance also may take the boiler island passage, becomes the huge hidden danger of safe operation, and the material consumption also can increase thereupon simultaneously.
Existing barrel slag cooler has multiple pattern, such as louvered, multitube, spiral etc.The demonstration of Chinese patent net, the patent about the fluidized-bed combustion boiler barrel slag cooler approximately has about 30 at present, and these slag coolers are to rely on the heat conduction between high-temperature ash and barrel to carry out in the overwhelming majority on the heat exchange mode.The cold slag machine of part has structurally been made improvement, such as the people's such as Xu Jie patent " rolling-cylinder type slag-cooler " (patent No. CN 201181175Y), changes the lifting blade structure of outer tube inner wall, so that the heat-transfer surface that does not contact with lime-ash is reduced to approximately 1/3rd; The patent " drum-type slag cooling device of material raising " (patent No. CN 201181176Y) of appointing people such as allowing has changed the structure of lifting blade, and it is made straight plate or bottom bending type, has strengthened the degree of stirring of granule materials; The people's such as Cao Xucheng patent " cylinder cinder cooling device of high-efficient cooling " (patent No. CN 200979169Y) arranges water pipe more than one leading the slag blade, has improved cooling effect; On the basis of telescopic and water-cooled barrel, these patents mainly are to improve the lifting blade structure, and high-temperature ash is shed downwards along with the rotation of cylinder arrives in the cylinder higher position, and perhaps managing in cylinder the space increases heat-transfer surface and come enhanced heat exchange.The subject matter that these patents solve comprises two aspects: the first, and solve lime-ash and followed to greatest extent the drum movement problem, namely effectively prolonged the time that lime-ash effectively conducts heat; The second, solved barrel slag cooler bearing capacity problem.The former mainly is reflected in various lifting blades, and the latter is reflected in the water wall structure on the jacket water (J.W.) air-cooled structure basis.
Although structurally made various improvement, the heat conduction between main or lime-ash particle swarm and barrel that the lime-ash cooling relies on.Heat conduction is a kind of diabatic process that depends critically upon the material physical property in three kinds of diabatic processes.Compare with convection current with radiation, thermal conduction resistance mainly is apparent on the thermal contact resistance, causes the heat-transfer capability of heat conduction very limited.Convection heat transfer' heat-transfer by convection can improve heat-transfer effect by changing fluid velocity.During barrel slag cooler work, therefore the duty that always exists the part barrel not covered by grey solid impurity particle manages to increase lime-ash to the coverage of cylinder wall, and tissue particles is washed away barrel uniformly will improve heat transfer effect greatly.The patent of Liu Baiqian " the heat transfer roller slag cooler is washed away in the avalanche type convection current continuously " just is based on this thinking and has designed the cold slag machine of Novel rotary drum.Because ash temperature constantly descends, rely on ability that radiant force reduces particle temperature more and more a little less than.Particularly be lower than after 400 ℃ when particle temperature, the heat that lime-ash carries is difficult to reclaim, if reclaim heat by heat-conducting mode, must need very large heat transfer area, and the perhaps long enough done of cylinder prolongs the cool time of lime-ash in cylinder as much as possible.
The introduction to aspects such as properties of product and corresponding technical research in relevant academic conference of domestic slag cooler main manufacturer is consistent with existing patent content, and the relevant report in the domestic periodical does not exceed the technical scope of above-mentioned patent yet.Because the birthplace of barrel slag cooler is China, can think does not have relevant technology contents in other language documents.A kind of barrel slag cooler that is intended to eliminate lime-ash " false cold " provided by the invention, on the basis of patent " the heat transfer roller slag cooler is washed away in the avalanche type convection current continuously " (application number 20112059376.3), introduce " receiving hot pond " device, overcome the shortcoming of heat conduction section undercapacity, cooling procedure from the heat-transfer mechanism tissue particles between particle and wall, cylinder is divided into radiation heat transfer section, convection section and heat conduction section, strengthens the heat exchange of different phase particle and cooling medium according to heat-transfer mechanism.Heat conduction section particle temperature is lower, mainly realizes the dynamic equilibrium that progressively reduces by granule interior heat conduction and the outside heat transfer by outer surface.Because the lime-ash particle diameter of discharging from CFBB is very little, what usually measure all is the temperature of lime-ash outer surface, the temperature of granule interior is difficult to measure, although but the grey solid impurity particle hull-skin temperature that in fact is discharged to the heat conduction section is very low, lime-ash granule interior temperature but is higher than the temperature of outer surface far away, causes " false cold " phenomenon of " the cold meat of skin is not cold ".
For " false cold " phenomenon, introduce " receiving hot pond " device in the heat conduction section of barrel slag cooler, after lime-ash enters the heat conduction section, enlarge the contact area of lime-ash and cylinder wall, the cool time of prolongation lime-ash in cylinder, lime-ash is fully cooled off, reach the purpose that the lime-ash internal and external temperature is reached unanimity, in the exit of barrel slag cooler stock guide is installed simultaneously, the lime-ash through thoroughly cooling is discharged, can effectively increase cooling capacity, dwindle drum length.Abdicate maintenance and passageway for fire apparatus for factory building simultaneously, eliminate safe hidden trouble, ensure and produce normal operation.
Summary of the invention
The objective of the invention is after lime-ash enters the heat conduction section, to play the heat exchange area that increases lime-ash and cylinder wall by introducing " receiving hot pond " device in the heat conduction section of barrel slag cooler, prolong the lime-ash double action of the cool time in cylinder.The lime-ash internal and external temperature is reached unanimity, and lime-ash is fully cooled off, and eliminates " false cold " phenomenon, provides a kind of cooling effect better efficient barrel slag cooler.
Technical scheme is as follows:
1. roller frame
Along the cylinder axis direction, a kind of barrel slag cooler that is intended to eliminate lime-ash " false cold " is divided into radiant heat transfer section, convection heat transfer' heat-transfer by convection section and conduction heat transfer section.See with regard to a cross section, this slag cooler is divided into inner core and urceolus.Urceolus is the fin panel casing with lifting blade, and lifting blade cooperates helical duct to organize grey solid impurity particle moving along cylinder axis.
2. the structure of " receiving hot pond "
Arranged " receiving hot pond " device for " false cold " phenomenon this patent in the heat conduction section of cylinder.When lime-ash moves to the heat conduction section under the effect of spiral stream guidance conduit and lifting blade, cylinder urceolus diameter becomes large suddenly, therefore, the heat-transfer surface that cylinder can be arranged increases, the heat convection effect further strengthens, played the increase heat exchange area, the effect that prolongs the time of contact of lime-ash and cylinder wall, lifting blade structure and the drum shaft of this section layout are less to angle simultaneously, be unfavorable for lime-ash discharge cylinder, further prolong the time of staying of lime-ash in cylinder, eliminate the false cold phenomenon of lime-ash " the cold meat of skin is not cold ".
Described a kind of barrel slag cooler that is intended to eliminate lime-ash " false cold ", high-temperature particle enters slag cooler from feeding mechanism 1, behind radiation heat transfer Duan Shiyu fin panel casing radiation heat transfer, lime-ash enters between inner/outer tube and cylinder inside under the drive of swing roller 2, then by lifting blade with the particle water conservancy diversion to groove 8, with convection section fin panel casing heat-shift.Constantly wash away the inner core surface at cylinder convection section high-temperature particle, form effective convection current of particle and fin panel casing 9 surfaces and light-pipe structure 10, can strengthen overall heat transfer effect.In cylinder heat conduction section, the low temperature lime-ash enters receives hot pool device, and diameter of cylinder increases, and lime-ash advances lime-ash after rotating a period of time with cylinder in the back, behind the arrival particle outlet, relies on gravity to discharge cylinder under the acting in conjunction of stock guide 3 and marker board 6.Cooling water enters from entrance 4, compile from exporting 5 after absorbing heat through cylinder, and rely on swivel joint the cooling water inlet manage, outlet and swing roller couple together.
A kind of barrel slag cooler that is intended to eliminate lime-ash " false cold " provided by the invention mainly is divided into radiation heat transfer section, convection section and heat conduction section.Take embodiment 1 as example, radiant section is take the radiation heat transfer between particle and wall as main, and this section inner core is squirrel-cage light-pipe structure 7, and urceolus is film water cold wall structure.Convection section advances particle to advance to slag-drip opening by arranging with the lifting blade that axially forms an angle, and facilitates the heat convection between particle and the water-cooled surface, but the Effective Raise cooling capacity.The heat conduction section is introduced and is received hot pool device, overcomes traditional slag cooler by the shortcoming of heat-conducting mode cooling lime-ash undercapacity.
Compared with prior art, advantage of the present invention is:
1, organizes diabatic process from high-temperature particle and wall heat-transfer mechanism, cylinder is divided into radiation heat transfer section, convection section and heat conduction section.Compare with existing barrel slag cooler, emphasis has been strengthened the heat convection between radiant heat transfer and particle and wall, and the perfect shortcoming of heat conduction section undercapacity is for the heat transfer mechanism of each section, take to be conducive to most the measure of heat exchange mode, can effectively increase cooling capacity;
2, the ingenious hot pool device of receipts of having arranged the heat conduction section under the constant prerequisite of drum length, has increased the heat exchange area of cylinder, prolongs the cool time of lime-ash in cylinder.
3, according to the variation of ash temperature, with every kind of best heat transfer boundary condition that heat exchange mode needs, respectively at the radiant section of barrel slag cooler, convection section, the heat conduction section is arranged differing heights, variety classes, the lifting blade of at least two kinds of patterns strengthens cooling effect.
4, under the equal volume prerequisite, can significantly increase effective heat transfer area, improve the heat absorption capacity of device;
5, in the radiation heat transfer section, take full advantage of the radiation characteristic of high-temperature powder and radiation falloff characteristic and increase Radiant exothermicity between particle and the wall;
6, owing to having strengthened heat-transfer effect, can dwindle drum length, economical with materials under the constant prerequisite of cylinder leading portion diameter.Can be simultaneously factory building and abdicate access path, eliminate safe hidden trouble, ensure and produce normal operation.
7, owing to obviously having improved heat transfer coefficient and having increased heat transfer area, prolonged the lime-ash time of staying, therefore can Effective Raise lime-ash treating capacity.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A sectional drawing (radiant section section) of Fig. 1 middle cylinder body;
Fig. 3 is the B-B sectional drawing (convection section section) of Fig. 1 middle cylinder body;
Fig. 4 is the C-C sectional drawing (heat conduction section section) of Fig. 1 middle cylinder body;
Fig. 5 is that the B of Fig. 1 middle cylinder body is to view (left view);
Fig. 6 is that the C of Fig. 1 middle cylinder body is to view (right view);
Among the figure: 1. feeding mechanism, 2. swing roller, 3. stock guide, 4. cooling water inlet, 5. coolant outlet, 6. marker board, 7. squirrel-cage light-pipe structure, 8. groove 9. fin panel casings, 10. light-pipe structure.
The specific embodiment
The present invention will be described below in conjunction with embodiment.
Embodiment 1: design parameter: 850 ℃ of ash temperature are cooled to 150 ℃
A kind of drum slag cooling captain 4.5m that is intended to eliminate lime-ash " false cold ", water-cooled urceolus diameter 1.2m, inner core effective diameter 0.8m; Radiation heat transfer segment length 1.5m, along 45 water cooling tubes of urceolus circumference, diameter 50mm, two tube hub wire clamp angles are 8 °, and form membrane wall with the welding of 5mm steel plate between two pipes, strengthen radiation heat exchange between particle and wall, perpendicular direction tube wall at the thick square steel plate of the water cooling tube welding 5mm of this membrane wall fin simultaneously; In the heat convection section, arrange altogether 48 water cooling tubes along the inner core circumference, be evenly arranged nine on each groove walls, welding 5mm steel plate is as the heat convection fin between same per two water cooling tubes, inner core is provided with 3 grooves altogether, the dark 0.3m of groove, and the recess edge setting is held grey sheet and is accepted the particle that the urceolus lifting blade is shed, the thick bottom bending of welding 5mm steel plate bends towards identical with the drum rotating direction as lifting blade on the urceolus membrane wall water cooling tube of this section simultaneously.Heat conduction heat exchange segment length 1m,, urceolus diameter 1.7m, along 60 water cooling tubes of urceolus circumference, diameter 50mm, two tube hub wire clamp angles are 8 °, and form membrane wall with the welding of 5mm steel plate between two pipes.
Key concept of the present invention is to arrange " receiving hot pond " device in the heat conduction section of cylinder, increases the heat exchange area of cylinder and lime-ash, strengthens the heat convection effect, the cool time of prolongation lime-ash in cylinder.Any embodiment based on thinking of the present invention all belongs within protection scope of the present invention.
Claims (5)
1. a barrel slag cooler that is intended to eliminate lime-ash " false cold " is characterized in that: according to the high-temperature ash coolant mechanism roller slag cooler is divided into radiation heat transfer section, convection section and heat conduction section vertically.
2. the barrel slag cooler that is intended to eliminate lime-ash " false cold " according to claim 1, it is characterized in that: the heat conduction section is introduced and is received the contact heat-exchanging area that hot pool device has increased lime-ash and cylinder wall, strengthen the heat convection effect, prolong the contact heat-exchanging time of lime-ash and cylinder wall.
3. the barrel slag cooler that is intended to eliminate lime-ash " false cold " according to claim 1, it is characterized in that: according to the variation of ash temperature, best heat transfer boundary condition with every kind of heat exchange mode needs, respectively at the radiant section of roller slag cooler, convection section, the heat conduction section is arranged differing heights, variety classes, the lifting blade of at least two kinds of patterns strengthens cooling effect.
4. the barrel slag cooler that is intended to eliminate lime-ash " false cold " according to claim 1, it is characterized in that: its radiant section heating surface has been considered emphatically radiation characteristic and the radiation attenuation characteristics of high-temperature ash, and the high-temperature ash that lifting blade is shed get off is minimum to the radiation falloff of radiant section heating surface.
5. the barrel slag cooler that is intended to eliminate lime-ash " false cold " according to claim 1, it is characterized in that: the convection section heating surface caters to the grey slag charge curtain of shedding continuously by unique inner tube structure, with the orderly grey solid impurity particle of its formation wash away continuously heat exchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210071541.4A CN103322560B (en) | 2012-03-19 | 2012-03-19 | It is a kind of to be intended to eliminate the false cold barrel slag cooler of lime-ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210071541.4A CN103322560B (en) | 2012-03-19 | 2012-03-19 | It is a kind of to be intended to eliminate the false cold barrel slag cooler of lime-ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103322560A true CN103322560A (en) | 2013-09-25 |
| CN103322560B CN103322560B (en) | 2018-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210071541.4A Expired - Fee Related CN103322560B (en) | 2012-03-19 | 2012-03-19 | It is a kind of to be intended to eliminate the false cold barrel slag cooler of lime-ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3323898B1 (en) | 2016-11-18 | 2019-06-26 | Steb S.r.l. | System, drum and method for cooling and recycling white slag used in a steel production process description |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070283902A1 (en) * | 2006-04-19 | 2007-12-13 | Mikhail Maryamchik | Integrated fluidized bed ash cooler |
| CN201335630Y (en) * | 2009-01-08 | 2009-10-28 | 南京科臣节能设备有限公司 | Constant-temperature lifting blade roller type slag cooler |
| CN201935617U (en) * | 2011-01-10 | 2011-08-17 | 刘柏谦 | Roller-type high-temperature-powder cooling device |
| CN202561733U (en) * | 2012-03-19 | 2012-11-28 | 刘柏谦 | Roller residue cooler aiming at removing 'false coldness' of ash residue |
-
2012
- 2012-03-19 CN CN201210071541.4A patent/CN103322560B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070283902A1 (en) * | 2006-04-19 | 2007-12-13 | Mikhail Maryamchik | Integrated fluidized bed ash cooler |
| CN201335630Y (en) * | 2009-01-08 | 2009-10-28 | 南京科臣节能设备有限公司 | Constant-temperature lifting blade roller type slag cooler |
| CN201935617U (en) * | 2011-01-10 | 2011-08-17 | 刘柏谦 | Roller-type high-temperature-powder cooling device |
| CN202561733U (en) * | 2012-03-19 | 2012-11-28 | 刘柏谦 | Roller residue cooler aiming at removing 'false coldness' of ash residue |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3323898B1 (en) | 2016-11-18 | 2019-06-26 | Steb S.r.l. | System, drum and method for cooling and recycling white slag used in a steel production process description |
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| CN103322560B (en) | 2018-09-04 |
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