CN104236315A - Process and device for directly preheating materials by magnesium melting lump afterheat - Google Patents
Process and device for directly preheating materials by magnesium melting lump afterheat Download PDFInfo
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- CN104236315A CN104236315A CN201410436588.5A CN201410436588A CN104236315A CN 104236315 A CN104236315 A CN 104236315A CN 201410436588 A CN201410436588 A CN 201410436588A CN 104236315 A CN104236315 A CN 104236315A
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Abstract
The invention belongs to the technical field of smelting fused magnesite by using magnesite as raw materials, and particularly relates to a process and a device for directly preheating materials by magnesium melting lump afterheat. The device is parallelly provided with two heat radiation passages and a preheating passage arranged between the two heat radiation passages, a smelted high-temperature magnesium melting lump is conveyed into the heat radiation passages to be cooled, the high-temperature magnesium melting lump is crystallized, cooled and solidified for releasing heat, after the crystallization is completed, the magnesium melting lump enters a hulling chamber for hulling and then returns back to a kiln body again, hot air in the heat radiation passages is exhausted to the preheating passage by an interlayer wall body, and the materials are preheated to 300 to 400 DEG C.
Description
Technical field
The invention belongs to magnesite is raw material melting fused magnesite technical field, particularly the direct preheating material technique of a kind of magnesium fusing lump afterheat and device.
Background technology
When taking magnesite as raw material melting fused magnesite, its product magnesium is molten sticks together in crystallization process that central temperature is up to 2800 DEG C, and outer rubber surface temperature is also more than 600 DEG C.The volume that sticks together because magnesium is molten is large, and outer rubber thermal conductivity factor is little, causes melting to magnesium the heat-obtaining sticked together very difficult, and the recycling of magnesium fusing lump afterheat resource has become a larger difficult problem.
At present, the heat recovery means of fused magnesite industry focus mostly in being melted the inner heat recovery that sticks together by the mode of heat exchanger and intermediate medium return being deposited in magnesium, then intermediate medium institute heat content are used for other and produce or among life.The heat exchange of this process route all adopts heat exchanger to realize, but there is the not high problem of heat exchange efficiency due to heat exchanger itself, causes heat energy utilization abundant not.In addition, generally need two groups or heat-exchange system more than two, the equipment more complicated adopted, and also higher to performance requirements such as equipment sealing, insulations.Meanwhile, no matter the heat contained by intermediate medium exists as a vapor or the form existence of hot blast, be used for generating electricity or preheating material, all need to utilize follow-up specific installation to be realized.So the problems such as poor effect, system complex, initial outlay be higher that adopt the mode heat exchange of Intermediate Heat Exchanger and intermediate medium to also exist.
It is exactly the Dry Quenching Technology adopting steel industry that the exhaust heat recovering method of electric-melting magnesium industry also has a kind of, by molten for the magnesium fragmentation at high operating temperatures that sticks together, adopts dry method of putting out to obtain high-temperature gas.Feasible on this Method And Principle, and respond well at steel industry.But, adopting the method to need one group complete dryly to put out device, still must set up heat energy recycle equipment as independent in material preheating tower, waste heat boiler etc. in subsequent handling for utilizing the high-temperature hot-air reclaimed.Moreover, because the molten cooling and crystallizing process that sticks together of magnesium is more complicated, its best broken time effectively can't be determined at present, fragmentation can cause deterioration in quality too early, has a strong impact on economic benefit, and fragmentation is excessively late, the molten internal temperature that sticks together of magnesium is relatively low, can not meet technological requirement and waste a large amount of complementary energy.Practical application in this approach to need further research and assessment.
Summary of the invention
The shortcomings such as the heat transfer effect existed in the waste heat recovery of fused magnesite industry is not good in order to overcome, system complex, initial investment are higher, the present invention proposes a kind of direct preheating material device of vehicle-mounted reverse-flow magnesium fusing lump afterheat and technique.Magnesium can be melted the heat sticked together under the condition not needing heat exchanger and intermediate medium according to the present invention and be directly passed to material, solve and use that each device heat transfer effect is not good, the problem of system complex in the past.The present invention does not need the follow-up equipment with reclaiming function such as material preheating tower, waste heat boiler, system is succinct, initial cost is less, decrease the layout of pipeline and corresponding energy loss, utilize this device can obtain the hot blast of more than 500 DEG C, material can be preheating to about 300 ~ 400 DEG C.
According to the present invention, the direct preheating material device of a kind of magnesium fusing lump afterheat is primarily of kiln hood fire door, kiln hood material gate, kiln body, side door, kiln tail fire door, kiln tail material gate, air-introduced machine and sandwich wall composition, wherein, kiln body comprises kiln hood and kiln tail, two kiln hood fire doors are provided with symmetrically at kiln hood place, kiln hood material gate is arranged between two kiln hood fire doors, the preheating channel being provided with two heat dissipation channels in kiln body along its length concurrently and being arranged between two heat dissipation channels, ground immediately below two heat dissipation channels is equipped with kiln car track, kiln tail place is provided with two kiln tail fire doors symmetrically, kiln tail material gate is arranged between two kiln tail fire doors, two side doors are provided with symmetrically in the centre position of the both sides along its length direction of kiln body, the outside of each side door is respectively provided with a magnesium and melts the shelling room sticked together, be separated from each other by sandwich wall between heat dissipation channel and preheating channel, same ground immediately below preheating channel is equipped with the truck track of loaded stock basket, suction hole is had symmetrically at the close kiln tail place of the both sides along its length of kiln body, sandwich wall near kiln hood place has sandwich wall body opening, air-introduced machine one side ducts is connected with the exhaust outlet of preheating channel bottom kiln tail bit, the pipeline of opposite side is connected with external environment.
Following operation is comprised: the magnesium that do not shell obtained is molten to stick together by kiln car through kiln hood fire door feeding heat dissipation channel by producing through three-phawse arc furnace melting according to a kind of waste heat of the present invention direct preheating material technique, the magnesium that do not shell melts the kiln car track sticked together bottom heat dissipation channel and moves to kiln tail, when kiln car and the magnesium that do not shell are molten stick together arrive side door place time, side door is opened, the magnesium that crystallization do not shelled completely is molten to stick together and sends into shelling indoor and shell, molten for shelling magnesium after shelling sticking together again is sent back to heat dissipation channel and continued to move to kiln tail direction, after arriving kiln tail fire door, molten for shelling magnesium sticking together is shifted out, carrying out fragmentation, the subsequent handlings such as screening, loaded in charging basket by the material be broken after processing, the porosity of material is 0.3 ~ 0.4, charging basket is sent into preheating channel through kiln tail material gate, is moved by the track of charging basket along charging basket, be moved out of finally by kiln hood material gate to kiln hood direction, cold air enters heat dissipation channel through suction hole from kiln tail and flows to kiln hood direction, through with magnesium melt the surface sticked together carry out heat convection after temperature progressively raise, preheating channel is flowed in via interlayer body of wall hole, kiln hood place, and flow to kiln tail by kiln hood, its energy transferring is lowered the temperature to after material, discharge finally by air-introduced machine, the flow velocity of furnace air is 2.5 ~ 3.5m/s.
According to an aspect of the present invention, molten for two magnesium sticking together is sent into two heat dissipation channels by every 12h symmetrically, and the charging basket one being filled in every 6 hours material sends into preheated zone, and magnesium is molten, and holdup time in kiln that to stick together with material is 84h, and kiln is long is 22.4m.
The invention has the advantages that:
(1) material preheating is reclaimed integrated with magnesium fusing lump afterheat, and interlayer body of wall separates molten for magnesium heat dissipation region and the material preheated zone of sticking together, and system architecture is simple;
(2) material is transported by charging basket, and be convenient to transport and adjustment, material realizes two-sided preheating, and pre-heat effect is good, homogeneous temperature.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the floor plan of process technology equipment of the present invention.
Fig. 2 is sandwich-type tunnel waste heat recovery kiln structural front view.
Fig. 3 is the sectional view of the sandwich-type tunnel waste heat recovery kiln structure intercepted along the A-A line of Fig. 1.
Fig. 4 is sandwich-type tunnel waste heat recovery kiln sandwich wall structure chart.
In accompanying drawing: 1. three-phawse arc furnace, 2. kiln hood fire door, 3. kiln hood material gate, 4. kiln body, 5. shell room, and the magnesium that 6. do not shell is molten to stick together, 7. side door, and 8. shelling, magnesium is molten to stick together, 9. kiln tail fire door, 10. kiln tail material gate, 11. magnesite, 12. air-introduced machines, 13. sandwich walls, 14. kiln car tracks, 15. sandwich wall body openings, 16. kiln car wheels, 17. kiln car car bodies, 18. exhaust outlets, 19. charging baskets, 20. kiln car supports, 21. kiln car crossbeams.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figures 1 to 4, the direct preheating material device of a kind of magnesium fusing lump afterheat according to the present invention is primarily of kiln hood fire door 2, kiln hood material gate 3, kiln body 4, side door 7, kiln tail fire door 9, kiln tail material gate 10, air-introduced machine 12 and sandwich wall 13 form, wherein, kiln body 4 comprises kiln hood and kiln tail, two kiln hood fire doors 2 are provided with symmetrically at kiln hood place, kiln hood material gate 3 is arranged between two kiln hood fire doors 2, the preheating channel being provided with two heat dissipation channels in kiln body 4 along its length concurrently and being arranged between two heat dissipation channels, ground immediately below two heat dissipation channels is equipped with kiln car track 14, kiln tail place is provided with two kiln tail fire doors 9 symmetrically, kiln tail material gate 10 is arranged between two kiln tail fire doors 9, two side doors 7 are provided with symmetrically in the centre position of the both sides along its length direction of kiln body 4, the outside of each side door 7 is respectively provided with a magnesium and melts the shelling room 5 sticked together, be separated from each other by sandwich wall 13 between heat dissipation channel and preheating channel, same ground immediately below preheating channel is equipped with the truck track of loaded stock basket, suction hole is had symmetrically at the close kiln tail place of the both sides along its length of kiln body 4, sandwich wall 13 near kiln hood place has sandwich wall body opening 15, air-introduced machine 12 1 side ducts is connected with the exhaust outlet of preheating channel bottom kiln tail bit, the pipeline of opposite side is connected with external environment.
Load charging basket 19 after magnesite 11 is broken, charging basket 19 enters preheating channel after kiln tail material gate 10, along with the carrying out produced, shifts out through kiln hood material gate 3, is directly sent in three-phawse arc furnace 1 by magnesite 11 and carry out melting after discharging.The magnesium that do not shell after melting melts 6 heat dissipation channels being entered kiln body 4 by kiln car 17 through kiln hood fire door 2 that stick together, and by radiation, energy is passed to sandwich wall 13 and charging basket 19, by convection current, energy is passed to furnace air.When molten 6 inside that stick together of the magnesium that do not shell complete after cleaning solidifies, open side door 7, the magnesium that do not shell is molten to stick together and 6 enters shelling room 5 along kiln car track 14, returns in kiln after completing shelling.Shift out finally by kiln tail fire door 9, carry out fragmentation, sorting.Cold air, under the effect of air-introduced machine 12, is sucked by suction hole 18, moves to kiln hood along heat dissipation channel by kiln tail, enters preheating channel, discharge finally by air-introduced machine 12 when through sandwich wall body opening 15.
Kiln car comprises kiln car track 14, kiln car wheel 16, kiln car car body 17, connects the kiln car crossbeam 21 of kiln car wheel 16 and support the kiln car support 20 of kiln car car body 17.
It is very high that the magnesium entering into heat dissipation channel melts the surface temperature sticked together, and both can realize heat convection with air, can also realize radiation heat transfer with sandwich wall and material.
Use said apparatus, its method of operating is as follows: 6 send into heat dissipation channel by kiln car through kiln hood fire door 2 by producing molten the sticking together of the magnesium that obtains through three-phawse arc furnace 1 melting, the magnesium that do not shell melts to stick together and 6 to move to kiln tail along the kiln car track 14 bottom heat dissipation channel, when kiln car and the magnesium that do not shell are molten stick together 6 arrival side door 7 place time, side door 7 is opened, molten for unhulled magnesium sticking together 6 is entered shelling room 5 along track 14, again send heat dissipation channel after completing shelling again back to and continue to move to kiln tail direction, being melted by shelling magnesium after arriving kiln tail fire door 9 sticks together 8 shifts out, and carries out fragmentation, sorting; By the material after fragmentation (such as, magnesite 11) load charging basket 18, the porosity of material is 0.3 ~ 0.4, and charging basket is sent into preheating channel after kiln tail material gate 10, the track of charging basket along charging basket is moved to kiln hood direction, shifts out through kiln hood material gate 3 after being heated; Cold air, under the effect of air-introduced machine 12, is sucked by suction hole 18, and heat dissipation channel moves to kiln hood by kiln tail, preheating channel is being entered through sandwich wall body opening 20, and flow to kiln tail by kiln hood, discharge finally by air-introduced machine 12, the flow velocity of furnace air is 2.5 ~ 3.5m/s.
Aforesaid operations without fixing execution sequence, such as, can perform simultaneously magnesium melt stick together heat radiation, the heating of material and logical cold air, also can different time perform.
Material size after fragmentation can be about 10cm.The material of preheating in preheating channel directly can be sent in three-phawse arc furnace 1 and carry out melting.
Within every 12 hours, molten for two magnesium sticking together can be sent into two heat dissipation channels symmetrically, the charging basket one can being filled material for every 6 hours sends into preheated zone, and magnesium is molten, and holdup time in kiln that to stick together with material is 84h, and kiln is long is 22.4m.
Use device of the present invention, finally material can be preheating to about 320 DEG C.
Claims (3)
1. the direct preheating material device of magnesium fusing lump afterheat, it is characterized in that, described device is primarily of kiln hood fire door, kiln hood material gate, kiln body, side door, kiln tail fire door, kiln tail material gate, air-introduced machine and sandwich wall composition, wherein, kiln body comprises kiln hood and kiln tail, two kiln hood fire doors are provided with symmetrically at kiln hood place, kiln hood material gate is arranged between two kiln hood fire doors, the preheating channel being provided with two heat dissipation channels in kiln body along its length concurrently and being arranged between two heat dissipation channels, ground immediately below two heat dissipation channels is equipped with kiln car track, two kiln tail fire doors are provided with symmetrically at kiln tail place, kiln tail material gate is arranged between two kiln tail fire doors, two side doors are provided with symmetrically in the centre position of the both sides along its length direction of kiln body, the outside of each side door is respectively provided with a magnesium and melts the shelling room sticked together, be separated from each other by sandwich wall between heat dissipation channel and preheating channel, same ground immediately below preheating channel is equipped with the truck track of loaded stock basket, suction hole is had symmetrically at the close kiln tail place of the both sides along its length of kiln body, sandwich wall near kiln hood place has sandwich wall body opening, the pipeline of the side of air-introduced machine is connected with the exhaust outlet of preheating channel bottom kiln tail bit, the pipeline of the opposite side of air-introduced machine is connected with external environment.
2. utilize a technique for the direct preheating material device of magnesium fusing lump afterheat as claimed in claim 1, it is characterized in that, described technique comprises following operation:
By producing through three-phawse arc furnace melting, the unhulled magnesium obtained is molten to stick together by kiln car through kiln hood fire door feeding heat dissipation channel, the magnesium that do not shell melts the kiln car track sticked together bottom heat dissipation channel and moves to kiln tail, when kiln car and the magnesium that do not shell are molten stick together arrive side door place time, side door is opened, the magnesium that crystallization do not shelled completely is molten to stick together and sends into shelling indoor and shell, molten for shelling magnesium after shelling sticking together again is sent back to heat dissipation channel and continued to move to kiln tail direction, after arriving kiln tail fire door, molten for shelling magnesium sticking together is shifted out, then carry out the subsequent handling such as fragmentation, screening;
Loaded in charging basket by the material be broken after processing, the porosity of material is 30% ~ 40%, charging basket is sent into preheating channel through kiln tail material gate, is moved by the track of charging basket along charging basket, be moved out of finally by kiln hood material gate to kiln hood direction;
Cold air enters heat dissipation channel through suction hole from kiln tail and flows to kiln hood direction, through with magnesium melt the surface sticked together carry out heat convection after temperature progressively raise, preheating channel is flowed in via interlayer body of wall hole, kiln hood place, and flow to kiln tail by kiln hood, its energy transferring is lowered the temperature to after material, discharge finally by air-introduced machine, the flow velocity of furnace air is 2.5 ~ 3.5m/s.
3. technique according to claim 2, it is characterized in that, molten for two magnesium sticking together was sent into two heat dissipation channels symmetrically in every 12 hours, the charging basket one being filled in every 6 hours material sends into preheated zone, magnesium is molten, and holdup time in kiln that to stick together with material is 84 hours, and kiln is long is 22.4m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410436588.5A CN104236315B (en) | 2014-08-29 | 2014-08-29 | A kind of direct preheating material technique of magnesium fusing lump afterheat and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410436588.5A CN104236315B (en) | 2014-08-29 | 2014-08-29 | A kind of direct preheating material technique of magnesium fusing lump afterheat and device |
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| CN104236315A true CN104236315A (en) | 2014-12-24 |
| CN104236315B CN104236315B (en) | 2016-03-23 |
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| CN201410436588.5A Expired - Fee Related CN104236315B (en) | 2014-08-29 | 2014-08-29 | A kind of direct preheating material technique of magnesium fusing lump afterheat and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443021A (en) * | 2018-12-04 | 2019-03-08 | 中冶焦耐(大连)工程技术有限公司 | A kind of waste heat recovery room for fused magnesium fusing lump afterheat recycling |
| CN109707471A (en) * | 2018-12-04 | 2019-05-03 | 中冶焦耐(大连)工程技术有限公司 | A kind of fused magnesium fusing lump afterheat utilizes method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS56142314A (en) * | 1980-04-08 | 1981-11-06 | Ishikawajima Harima Heavy Ind Co Ltd | Scrap preheating method and device therefor |
| CN101870560A (en) * | 2010-06-18 | 2010-10-27 | 北京大学 | Method for recovering waste heat of electrically fused magnesium fused weight |
| CN201757853U (en) * | 2010-07-09 | 2011-03-09 | 沈阳金和节能工程有限公司 | Intelligent control system of waste heat recycling device in process of electric fusing magnesium production |
| CN102269526A (en) * | 2010-06-03 | 2011-12-07 | 陈耕田 | Electrically fused magnesium lump waste heat reclaiming device and method |
| CN102345983A (en) * | 2011-01-10 | 2012-02-08 | 沈阳东大工业炉有限公司 | Technology and device for recycling waste heat of electrically fused magnesia smelted block |
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2014
- 2014-08-29 CN CN201410436588.5A patent/CN104236315B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56142314A (en) * | 1980-04-08 | 1981-11-06 | Ishikawajima Harima Heavy Ind Co Ltd | Scrap preheating method and device therefor |
| CN102269526A (en) * | 2010-06-03 | 2011-12-07 | 陈耕田 | Electrically fused magnesium lump waste heat reclaiming device and method |
| CN101870560A (en) * | 2010-06-18 | 2010-10-27 | 北京大学 | Method for recovering waste heat of electrically fused magnesium fused weight |
| CN201757853U (en) * | 2010-07-09 | 2011-03-09 | 沈阳金和节能工程有限公司 | Intelligent control system of waste heat recycling device in process of electric fusing magnesium production |
| CN102345983A (en) * | 2011-01-10 | 2012-02-08 | 沈阳东大工业炉有限公司 | Technology and device for recycling waste heat of electrically fused magnesia smelted block |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443021A (en) * | 2018-12-04 | 2019-03-08 | 中冶焦耐(大连)工程技术有限公司 | A kind of waste heat recovery room for fused magnesium fusing lump afterheat recycling |
| CN109707471A (en) * | 2018-12-04 | 2019-05-03 | 中冶焦耐(大连)工程技术有限公司 | A kind of fused magnesium fusing lump afterheat utilizes method and system |
| CN109707471B (en) * | 2018-12-04 | 2024-01-30 | 中冶焦耐(大连)工程技术有限公司 | Method and system for utilizing waste heat of fused magnesium melting lump |
| CN109443021B (en) * | 2018-12-04 | 2024-04-23 | 中冶焦耐(大连)工程技术有限公司 | Waste heat recovery chamber for waste heat recovery of fused magnesium lump |
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