CN101654736B - Suspension stay sintering process and system - Google Patents
Suspension stay sintering process and system Download PDFInfo
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- CN101654736B CN101654736B CN2008100128404A CN200810012840A CN101654736B CN 101654736 B CN101654736 B CN 101654736B CN 2008100128404 A CN2008100128404 A CN 2008100128404A CN 200810012840 A CN200810012840 A CN 200810012840A CN 101654736 B CN101654736 B CN 101654736B
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Abstract
The invention relates to a suspension stay sintering process and a suspension stay sintering system. The suspension stay sintering process comprises the following steps that: raw slurry in a slurry storage tank is delivered into a drying tower, and is dried through flash evaporation into dry raw meal powder by high temperature flue gas from a staying furnace in the dying tower; waste gas containing the dry raw meal powder in the drying tower is discharged after the gas-solid separation of a cyclone separator; dry raw meal powder prepared by the gas-solid separation through the cyclone separator and the dry raw meal powder in the drying tower enter a calcination main furnace and are sintered into clinker aggregate; the clinker aggregate containing the high temperature flue gas in the calcination main furnace enters the cyclone separator on the upper part of the staying furnace to undergo gas-solid separation, the separated high temperature flue gas enters the drying tower, and the separated clinker aggregate is subjected to heat preservation and stays on the lower part of the staying furnace; and the clinker aggregate on the lower part of the staying furnace enters a sintered product bin through the cyclone separator. The staying furnace is additionally arranged, so the staying time is multiplied, the time for chemical reaction is prolonged, and the quality of sintered products is greatly improved.
Description
Technical field
The present invention relates to a kind of sintering process and system, relate in particular to a kind of suspension stay sintering process and the system that are applicable to material suspended calcining occasion, belong to metallurgical technology field.
Background technology
Sometimes material will be carried out sintering in metallurgical industry is produced, the suspension sintering is meant under the suspended state of material in Industrial Stoves finishes sintering process, is a kind of in the multiple sintering process.Advantage such as the suspension sintering has that heat transfer rate is fast, thermo-efficiency is high, compact equipment, construction investment are low.Chemical reaction between solid phase is generally finished by diffusion, and the phase mutual diffusion between two kinds of materials needs the regular hour.Short when adopting traditional suspension sintering process because of the material agglomerating time, make some chemical reactions have little time to finish, make can't meet the quality requirement of sintered product, this is the traditional suspension sintering process and the disadvantage of equipment.
Summary of the invention
For solving the problems of the technologies described above a kind of suspension stay sintering process and the system of the invention provides, purpose is that the material insulation in stopping stove under the sintering temperature is stopped, make the residence time several times ground of material under sintering temperature increase, prolong the time of chemical reaction between solid, thereby improved the quality of sintered product significantly.
For reaching a kind of suspension stay sintering process of above-mentioned purpose the present invention, it comprises the steps: the charge pulp in the slip storage tank is delivered in the drying tower, and charge pulp is dried into dried raw material powder from the high-temperature flue gas flash distillation that stops stove in drying tower; The waste gas that contains dried raw material powder in the drying tower enters cyclonic separator carry out gas solid separation after waste gas discharge; Dried raw material powder in the dried raw material powder of cyclonic separator gas solid separation gained and the drying tower enters the main stove of calcining and is sintered into grog; Calcine grog that main stove contains the high-temperature flue gas of grog and enter the cyclonic separator that stops stove top and carry out gas solid separation, the high-temperature flue gas after the separation enters drying tower, and the grog after the separation stops stopping the insulation of stove bottom; Leave the grog that stops the stove bottom and after the cooling of multistage cyclone water cooler, enter the sintered products storehouse.
Charge pulp in the described slip storage tank is delivered to the atomizing nozzle of drying tower bottom by the high-pressure pump that is located at the outlet of slip storage tank by pipeline, in atomizing nozzle sprays into drying tower.
Described atomizing nozzle is located at the bottom of drying tower.
The waste gas that contains dried raw material powder in the described drying tower enters primary cyclone from the top of drying tower, and waste gas enters secondary cyclone after the primary cyclone gas solid separation, and secondary cyclone continues waste gas is carried out gas solid separation.
Described secondary cyclone separated waste gases enters into waste heat boiler from the top of secondary cyclone, and the isolated solid of secondary cyclone enters into primary cyclone once more.
Described waste heat boiler reclaims a part of heat in the waste gas, and the waste gas after the cooling enters electricity and gathers dust and enter atmosphere through induced draft fan and chimney after further purifying.
The main stove of described calcining is by pilot burner and main burner heat supply; Drying tower is by drying and burning device complementary heating.
The grog following current of described stop stove bottom enters the first step, the second stage, the third stage, fourth stage cooling cyclone successively, carry out the heat exchange cooling with the cold wind that comes from fourth stage cooling cyclone adverse current, cooled grog leaves from fourth stage cooling cyclone at last and enters the product storehouse.
Described cold wind enters from fourth stage cooling cyclone, and adverse current enters in the third stage, the second stage, the first step cooling cyclone successively again.
The cold air inlet that receives cold wind is arranged at the top of described Category Four cyclone water cooler.
The charge pulp water ratio is 33%～50% in the described slip storage tank; Charge pulp is dried into the dried raw material powder that does not contain attached water in drying tower, the spent air temperture that leaves drying tower is 250 ℃-400 ℃.
Grog after the described separation is stopping the temperature stop of stove bottom, and the insulation residence time is 1～20 times of the main stove sintering time of calcining.
Sintering temperature is 1050～1300 ℃ in the main stove of described calcining.
A kind of suspension stay sintering system, be made of following structure: the slip storage tank is connected with drying tower by pipeline, drying tower is connected with the cyclonic separator of top, cyclonic separator is connected with blowdown system, and the bottom of cyclonic separator is connected with the main stove of the calcining of below, and the bottom of drying tower is connected with the main stove of the calcining of below, calcining main stove is connected with the stop stove, the top that stops stove is connected with drying tower, and the bottom that stops stove is connected with the cooling cyclone of below, and cooling cyclone is connected with the sintered products storehouse.
The pipeline of the outlet of described slip storage tank is provided with high-pressure pump, and drying tower charge pulp ingress is provided with atomizing nozzle.
The atomizing nozzle of described drying tower charge pulp ingress is located at the bottom of drying tower.
The pneumatic outlet at described drying tower top is connected with the inlet of cyclonic separator.
The bottom of described drying tower is connected with the drying and burning device, and the drying and burning device is connected with fuel gas pipe.
Described cyclonic separator comprises primary cyclone and secondary cyclone; The top of primary cyclone is connected with the top of secondary cyclone, and the bottom of secondary cyclone is connected with the top of primary cyclone.
The pneumatic outlet of described secondary cyclone is connected with waste heat boiler, and waste heat boiler gathers dust with electricity and is connected, and electricity gathers dust and is connected with induced draft fan, induced draft fan with waste gas by smoke stack emission.
The top of described stop stove also is provided with cyclonic separator, and the pneumatic outlet at cyclonic separator top is connected with the gas inlet of drying tower bottom, and Link Port is located at the top of charge pulp atomizing nozzle.
Dried raw material powder in described drying tower and the primary cyclone is delivered to the bottom of the main stove of calcining and is calcined.
The below that the main stove of described calcining is calcined dried raw material powder is connected with main burner with pilot burner.
Described pilot burner is connected with fuel gas pipe with main burner.
The grog of described stop stove bottom enters first step cooling cyclone.
Described cooling cyclone comprises one-level cooling cyclone, secondary cooling cyclone, three grades of cooling cyclones and Category Four cyclone water cooler; Grog enters the top of one-level cooling cyclone successively from the bottom that stops stove, enter the top of secondary cooling cyclone from the bottom of one-level cooling cyclone, enter the top of three grades of cooling cyclones from the bottom of secondary cooling cyclone, enter the top of Category Four cyclone water cooler from the bottom of three grades of cooling cyclones, enter into the sintered products storehouse from the bottom of Category Four cyclone water cooler.
The top of described Category Four cyclone water cooler is connected with cold air inlet, the top of Category Four cyclone water cooler is connected with the top of three grades of cooling cyclones, the top of three grades of cooling cyclones is connected with the top of secondary cooling cyclone, and the top of secondary cooling cyclone is connected with the top of one-level cooling cyclone.
Cold wind is delivered in the bottom that stops stove and the main stove of calcining at the top of described one-level cooling cyclone.
Advantageous effect of the present invention: increase a stop stove, material insulation in stopping stove under the sintering temperature is stopped, make the residence time several times ground of material under sintering temperature increase, prolonged the time of chemical reaction, thereby improved the quality of sintered product significantly.Adopt the waste heat boiler of hot pipe technique, can reclaim the heat in the waste gas effectively.Make system's punishment in advance smoothness, fuel combustion is abundant, heat utilization efficiency is high.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.
Among the figure: 1. pilot burner, 2. main burner, 3. drying and burning device, 4. slip storage tank, 5. high-pressure pump, 6. atomizing nozzle, 7. drying tower, 8. cyclonic separator, 9, fuel gas pipe is 10. calcined main stove, and 11. stop stoves, 12. one-level cooling cyclones, 13. the secondary cooling cyclone, 14. 3 grades of cooling cyclones, 15. Category Four cyclone water coolers, 16. cold air inlet, 17. sintered products storehouses, 18. waste heat boilers, 19. electricity gathers dust, 20. induced draft fans, 21. chimneys.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
A kind of suspension stay sintering process of the present invention as shown in Figure 1, comprise the steps: that water ratio in the slip storage tank 4 are that 33%～50% charge pulp is delivered to drying tower 7 bottoms by the high-pressure pump 5 that is located at 4 outlets of slip storage tank by pipeline, in atomizing nozzle 6 sprays into drying tower 7; Charge pulp is dried into the dried raw material powder that does not contain attached water from the high-temperature flue gas flash distillation that stops stove 11 in drying tower 7; Leaving waste gas that drying tower 7 contains the dried raw material powder of part enters cyclonic separator 8 and carries out gas solid separation; Temperature is that 250 ℃～400 ℃ waste gas leaves cyclonic separator 8 and enters waste heat boiler 18, and a part of heat that waste heat boiler 18 reclaims in the waste gas, the waste gas after the cooling are gathered dust by electricity and 19 further purify after induced draft fan 20 and chimney 21 enter atmosphere; Dried raw material powder in the dried raw material powder of cyclonic separator 8 gas solid separation gained and the drying tower 7 enter the main stove 10 of calcining and are sintered into grog, calcine that sintering temperature is 1050～1300 ℃ in the main stove; Calcining high-temperature flue gas that main stove 10 contains grog enters the cyclonic separator that stops stove 11 tops and carries out gas solid separation, high-temperature flue gas after the separation enters that drying tower 7 removes to dry charge pulp, the grog after separating stops stopping the insulation of stove 11 bottoms, the insulation residence time is 1～20 times of main stove 10 sintering times of calcining, calcined main stove sintering time in the present embodiment about 1 minute, the time that stops in stopping stove is about 20 minutes; Leave the grog that stops stove 11 enter first step cooling cyclone 12 with from the cold wind heat exchange of second stage cooling cyclone 13 and be cooled, the grog that leaves first step cooling cyclone 12 enter again second stage cooling cyclone 13 with from the cold wind heat exchange of third stage cooling cyclone 14 and be cooled, the grog that leaves second stage cooling cyclone 13 enter again third stage cooling cyclone 14 with from the cold wind heat exchange of fourth stage cooling cyclone 15 and be cooled, the grog that leaves third stage cooling cyclone 14 enter again fourth stage cooling cyclone 15 with from the cold wind heat exchange of cold air inlet 16 and be cooled, be cooled to grog below 120 ℃ and leave from the bottom of fourth stage cooling cyclone 15 at last and enter product storehouse 17; The most of hot blast that leaves first step cooling cyclone 12 enters the main stove 10 of calcining and does combustion air from the bottom of calcining main stove 10, the small part hot blast enters stop stove 11 and does fluidized wind from the bottom that stops stove 11; Calcine main stove 10 by pilot burner 1 and main burner 2 heat supplies; Higher when water content of crude material slurry, from the hot blast that stops stove 11 with shortage of heat the time, drying tower 7 carries out complementary heating by drying and burning device 3; Most of dried raw material powder and gas are the adverse current trends in drying tower, and solid materials and gas are the following current trends in the main stove of calcining, stop stove, cyclonic separator, cooling cyclone.
Stopping stove 11 tops is cyclone separator structures, and the bottom is the fluid-bed structure.
A kind of suspension stay sintering system of the present invention, be made of following structure: slip storage tank 4 is connected with drying tower 7 by pipeline, drying tower 7 is connected with the cyclonic separator of top, and cyclonic separator is connected with blowdown system, and cyclonic separator 8 comprises primary cyclone and secondary cyclone; The top of primary cyclone is connected with the top of secondary cyclone, the bottom of secondary cyclone is connected with the top of primary cyclone, the top of secondary cyclone is connected with the waste heat boiler of blowdown system 18, waste heat boiler 18 is a heat pipe waste heat boiler, waste heat boiler 18 and electricity gather dust and 19 are connected, electricity gathers dust and 19 is connected with induced draft fan 20, induced draft fan 20 discharges waste gas by chimney 21, the bottom of primary cyclone 8 is connected with the main stove 10 of the calcining of below, the bottom of drying tower 7 is connected with the main stove 10 of the calcining of below, dried raw material powder in drying tower 7 and the primary cyclone 8 is delivered to the bottom of the main stove 10 of calcining and is calcined, the below of calcining the dried raw material powder of main stove 10 calcinings is connected with main burner 2 with pilot burner 1, pilot burner 1 is connected with fuel gas pipe 22 with main burner 2, calcining main stove 10 is connected with stop stove 11, the top that stops stove 11 is provided with cyclonic separator, the top of cyclonic separator is connected with the bottom of drying tower 7 and Link Port is located at the top of charge pulp ingress atomizing nozzle 6, the bottom that stops stove 11 is connected with the cooling cyclone of below, the grog that stops the bottom stop of stove 11 enters the top of cooling cyclone from the bottom, cooling cyclone comprises one-level cooling cyclone 12, secondary cooling cyclone 13, three grades of cooling cyclones 14 and Category Four cyclone water cooler 15; Grog enters the top of one-level cooling cyclone 12 successively from the bottom that stops stove 11, enter the top of secondary cooling cyclone 13 from the bottom of one-level cooling cyclone 12, enter the top of three grades of cooling cyclones 14 from the bottom of secondary cooling cyclone 13, enter the top of Category Four cyclone water cooler 15 from the bottom of three grades of cooling cyclones 14, enter into sintered products storehouse 17 from the bottom of Category Four cyclone water cooler 15; Cold air duct is that the top of Category Four cyclone water cooler 15 is connected with cold air inlet 16, the top of Category Four cyclone water cooler 15 is connected with the top of three grades of cooling cyclones 14, the top of three grades of cooling cyclones 14 is connected with the top of secondary cooling cyclone 13, the top of secondary cooling cyclone 13 is connected with the top of one-level cooling cyclone 12, and cold wind is delivered in the bottom that stops stove 11 and the main stove 10 of calcining at the top of one-level cooling cyclone 12.
On the pipeline of the outlet of slip storage tank 4, be provided with high-pressure pump 5, drying tower 7 charge pulp ingress are provided with atomizing nozzle 6, the atomizing nozzle 6 of drying tower 7 charge pulp ingress is located at the bottom of drying tower 7, the top of drying tower 7 is connected with the top of cyclonic separator, the bottom of drying tower 7 is connected with drying and burning device 3, and drying and burning device 3 is connected with fuel gas pipe 9.
Calcine main stove bottom and be provided with outside pilot burner and the main burner, also be provided with the drying and burning device, with the generation of the not enough situation of reply water content of crude material slurry higher heat in the drying tower bottom.
Claims (28)
1. a suspension stay sintering process is characterized in that comprising the steps: the charge pulp in the slip storage tank is delivered in the drying tower, and charge pulp is dried into dried raw material powder from the high-temperature flue gas flash distillation that stops stove in drying tower; The waste gas that contains dried raw material powder in the drying tower enters cyclonic separator carry out gas solid separation after waste gas discharge; Dried raw material powder in the dried raw material powder of cyclonic separator gas solid separation gained and the drying tower enters the main stove of calcining and is sintered into grog; Calcine grog that main stove contains the high-temperature flue gas of grog and enter the cyclonic separator that stops stove top and carry out gas solid separation, the high-temperature flue gas after the separation enters drying tower, and the grog after the separation stops stopping the insulation of stove bottom; Leave the grog that stops the stove bottom and after the cooling of multistage cyclone water cooler, enter the sintered products storehouse.
2. a kind of suspension stay sintering process according to claim 1 is characterized in that the charge pulp in the described slip storage tank is delivered to the atomizing nozzle of drying tower bottom by the high-pressure pump that is located at the outlet of slip storage tank by pipeline, in atomizing nozzle sprays into drying tower.
3. a kind of suspension stay sintering process according to claim 2 is characterized in that described atomizing nozzle is located at the bottom of drying tower.
4. according to this a kind of suspension stay sintering process of claim 1, it is characterized in that the interior waste gas that contains dried raw material powder of described drying tower enters primary cyclone from the top of drying tower, waste gas enters secondary cyclone after the primary cyclone gas solid separation, and secondary cyclone continues waste gas is carried out gas solid separation.
5. a kind of suspension stay sintering process according to claim 4, it is characterized in that described secondary cyclone separated waste gases enters into waste heat boiler from the top of secondary cyclone, the isolated solid of secondary cyclone enters into primary cyclone once more.
6. a kind of suspension stay sintering process according to claim 5 is characterized in that described waste heat boiler reclaims a part of heat in the waste gas, and the waste gas after the cooling enters electricity and gathers dust and enter atmosphere through induced draft fan and chimney after further purifying.
7. a kind of suspension stay sintering process according to claim 1 is characterized in that the main stove of described calcining is by pilot burner and main burner heat supply; Drying tower is by drying and burning device complementary heating.
8. a kind of suspension stay sintering process according to claim 1, the grog following current that it is characterized in that described stop stove bottom enters the first step, the second stage, the third stage, fourth stage cooling cyclone successively, carry out the heat exchange cooling with the cold wind that comes from fourth stage cooling cyclone adverse current, cooled grog leaves from fourth stage cooling cyclone at last and enters the product storehouse.
9. a kind of suspension stay sintering process according to claim 8 is characterized in that described cold wind enters from fourth stage cooling cyclone, and adverse current enters in the third stage, the second stage, the first step cooling cyclone successively again.
10. according to Claim 8 or 9 described a kind of suspension stay sintering process, the cold air inlet that receives cold wind is arranged again at the top that it is characterized in that described Category Four cyclone water cooler.
11. a kind of suspension stay sintering process according to claim 1 is characterized in that the charge pulp water ratio is 33%～50% in the described slip storage tank; Charge pulp is dried into the dried raw material powder that does not contain attached water in drying tower, the spent air temperture that leaves drying tower is 250 ℃-400 ℃.
12. a kind of suspension stay sintering process according to claim 1 is characterized in that the grog after the described separation is stopping the insulation stop of stove bottom, the insulation residence time is 1～20 times of the main stove sintering time of calcining.
13. a kind of suspension stay sintering process according to claim 1, it is characterized in that calcine that sintering temperature is 1050～1300 ℃ in the main stove.
14. suspension stay sintering system, it is characterized in that being made of following structure: the slip storage tank is connected with drying tower by pipeline, drying tower is connected with the cyclonic separator of top, cyclonic separator is connected with blowdown system, the bottom of cyclonic separator is connected with the main stove of the calcining of below, the bottom of drying tower is connected with the main stove of the calcining of below, calcining main stove is connected with the stop stove, the top that stops stove is connected with drying tower, the bottom that stops stove is connected with the cooling cyclone of below, and cooling cyclone is connected with the sintered products storehouse.
15. a kind of suspension stay sintering system according to claim 14 is characterized in that the pipeline of the outlet of described slip storage tank is provided with high-pressure pump, drying tower charge pulp ingress is provided with atomizing nozzle.
16. a kind of suspension stay sintering system according to claim 15 is characterized in that the pneumatic outlet at described drying tower top is connected with the inlet of cyclonic separator.
17. a kind of suspension stay sintering system according to claim 14 is characterized in that the top of described drying tower is connected with the top of cyclonic separator.
18. according to claim 14,15,16 or 17 described a kind of suspension stay sintering systems, it is characterized in that the bottom of described drying tower is connected with the drying and burning device, the drying and burning device is connected with fuel gas pipe.
19. a kind of suspension stay sintering system according to claim 17 is characterized in that described cyclonic separator comprises primary cyclone and secondary cyclone; The top of primary cyclone is connected with the top of secondary cyclone, and the bottom of secondary cyclone is connected with the top of primary cyclone.
20. according to claim 14 or 19 described a kind of suspension stay sintering systems, the top that it is characterized in that described secondary cyclone is connected with the waste heat boiler of blowdown system, waste heat boiler gathers dust with electricity and is connected, and electricity gathers dust and is connected with induced draft fan, induced draft fan with waste gas by smoke stack emission.
21. a kind of suspension stay sintering system according to claim 14, the top that it is characterized in that described stop stove also is provided with cyclonic separator, the pneumatic outlet at cyclonic separator top is connected with the gas inlet of drying tower bottom, and Link Port is located at the top of charge pulp atomizing nozzle.
22. a kind of suspension stay sintering system according to claim 14 is characterized in that dried raw material powder in described drying tower and the primary cyclone delivers to the bottom of the main stove of calcining and calcine.
23., it is characterized in that the main stove of described calcining calcines the below of dried raw material powder and be connected with main burner with pilot burner according to claim 14 or 22 described a kind of suspension stay sintering systems.
24. a kind of suspension stay sintering system according to claim 23 is characterized in that described pilot burner is connected with fuel gas pipe with main burner.
25. a kind of suspension stay sintering system according to claim 14 is characterized in that the grog of described stop stove bottom enters first step cooling cyclone.
26. a kind of suspension stay sintering system according to claim 25 is characterized in that described cooling cyclone comprises one-level cooling cyclone, secondary cooling cyclone, three grades of cooling cyclones and Category Four cyclone water cooler; Grog enters the top of one-level cooling cyclone successively from the bottom that stops stove, enter the top of secondary cooling cyclone from the bottom of one-level cooling cyclone, enter the top of three grades of cooling cyclones from the bottom of secondary cooling cyclone, enter the top of Category Four cyclone water cooler from the bottom of three grades of cooling cyclones, enter into the sintered products storehouse from the bottom of Category Four cyclone water cooler.
27. a kind of suspension stay sintering system according to claim 26, the top that it is characterized in that described Category Four cyclone water cooler is connected with cold air inlet, the top of Category Four cyclone water cooler is connected with the top of three grades of cooling cyclones, the top of three grades of cooling cyclones is connected with the top of secondary cooling cyclone, and the top of secondary cooling cyclone is connected with the top of one-level cooling cyclone.
28. a kind of suspension stay sintering system according to claim 27 is characterized in that cold wind is delivered in the bottom that stops stove and the main stove of calcining at the top of described one-level cooling cyclone.
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| CN2008100128404A CN101654736B (en) | 2008-08-19 | 2008-08-19 | Suspension stay sintering process and system |
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| CN104058435B (en) * | 2014-06-05 | 2016-08-24 | 鞠复勇 | The Apparatus and method for of aluminium oxide fired by a kind of aluminum oxide gaseous state suspending calcining stove |
| CN109798779B (en) * | 2019-01-27 | 2024-01-19 | 新吉电(吉林)工程技术有限公司 | Multistage separation heating method and device for furnace burden of direct-current submerged arc furnace hot charging |
| CN109827426A (en) * | 2019-03-07 | 2019-05-31 | 北京航化节能环保技术有限公司 | A kind of anticorrosive roasting system and method |
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