CN102560091B - Preparation method and preparation device for weak reducing gas and flash-magnetization iron ore roasting system - Google Patents
Preparation method and preparation device for weak reducing gas and flash-magnetization iron ore roasting system Download PDFInfo
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- CN102560091B CN102560091B CN201210044431.9A CN201210044431A CN102560091B CN 102560091 B CN102560091 B CN 102560091B CN 201210044431 A CN201210044431 A CN 201210044431A CN 102560091 B CN102560091 B CN 102560091B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 182
- 239000003034 coal gas Substances 0.000 claims abstract description 61
- 230000009467 reduction Effects 0.000 claims description 82
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 239000002817 coal dust Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000002485 combustion reaction Methods 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 12
- 239000003245 coal Substances 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 74
- 239000000203 mixture Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 14
- 230000001276 controlling effect Effects 0.000 description 8
- 230000002829 reductive effect Effects 0.000 description 8
- 230000005415 magnetization Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008676 import Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a preparation method and a preparation device for a weak reducing gas and a flash-magnetization iron ore roasting system. The preparation method comprises the following steps: combusting coal powder in a hot air furnace to generate hot air; inflating coal gas generated by a coal gas generating furnace into the hot air furnace; inflating anaerobic doped air into the hot air furnace, and mixing the hot air, the coal gas and the anaerobic doped air in the hot air furnace; regulating the volume ratio between the coal gas, the anaerobic doped air and the hot air generated by the hot air furnace; and preparing the weak reducing gas with the temperature of 600 to 950 DEG C and the volume percentage of CO of 2 to 12 percent. The preparation device comprises the coal gas generating furnace, the hot air furnace and anaerobic doped air supplying equipment. The flash-magnetization iron ore roasting system comprises the preparation device for the weak reducing gas, a roasting device, a feeding device and a discharging device. The preparation method and the preparation device for the weak reducing gas and the flash-magnetization iron ore roasting system have the advantages of stable flue gas components, low energy consumption and low cost.
Description
Technical field
The present invention relates to iron ore magnetic roasting field, especially relate to a kind of preparation method, device and flash-magnetization iron ore roasting system of week reduction gas.
Background technology
Flash magnetization roasting technology is by the ferric oxide ores such as limonite of the difficult choosing of powdery, in week reduction gas, through the roasting of multiple stage circulation fluidised form, then through low intensity magnetic separation, obtains high-grade iron ore concentrate.The in the situation that of stable in fluidised form field, the main technologic parameters that affects magnetizing roasting reduction effect is: the CO concentration in week reduction gas, maturing temperature, so guarantee that the stable of above two processing parameters is the key of whole technology controlling and process.
Therefore, people are devoted to study the preparation method of the stable week reduction gas of processing parameter always.Patent CN101575668B discloses " method of recovering iron in melting waste slag through flash boiling magnetizing roasting ", as shown in Figure 1, in the method, flash magnetization roasting gas used is mixed and is obtained by following two-way gas: the coal gas B that the 20-50mm coal grain that burns in the high-temperature flue gas A that the following coal grain of the 10mm that burns in fluidizing furnace produces and producer gas generator produces; The volume mixture ratio of flue gas A and coal gas B is 1: 1～1: 2.5.The method needs a large amount of air to make coal dust boiling when using boiling furnace combustion, air used is much larger than the required air of burning, so always contain a large amount of oxygen in the flue gas producing, in flue gas A and coal gas B N-process, need the extra amount that increases coal gas B come in and the oxygen in flue gas A, increase the preparation cost of coal gas B, and then increased the production cost of flash magnetization roasting.
Certainly, only with coal gas, make combustion gas and reductive agent and pass into roasting system and also can produce week reduction gas, but still have the problem that energy consumption is high, cost is high.
In the heavy industrialization application of flash magnetization roasting technology, in the urgent need to obtaining stable components, a large amount of week reduction gases that easy to adjust and production cost is low, and still there is preparation poor controllability, high in cost of production defect in existing week reduction gas generation method and control method, this problem is outstanding day by day, urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of preparation method, device and flash-magnetization iron ore roasting system of week reduction gas, for solving the problem that flash magnetization roasting technology week reduction gas used smoke components is unstable, energy consumption is high, cost is high.
The invention provides a kind of preparation method of week reduction gas, this preparation method comprises: at hotblast stove internal combustion coal dust, produce hot blast; The coal gas that producer gas generator is produced is passed in hotblast stove; Anaerobic is mixed to wind and be passed in hotblast stove, this anaerobic is mixed the volumn concentration of oxygen in wind and is less than 1%; Hot blast, coal gas and anaerobic are mixed wind and are mixed in hotblast stove; By allotment hot blast, coal gas and anaerobic, mix the volume ratio between wind, making temperature is 600～950 ℃, the week reduction gas that the volumn concentration of CO is 2～12%.
Further, it is the tail gas that nitrogen, rare gas element or flash-magnetization iron ore roasting device are discharged that this anaerobic is mixed wind, or both or three's mixed gas wherein.
Further, hot blast, coal gas and anaerobic are mixed the volume ratio of wind and are: hot blast: coal gas: anaerobic is mixed wind=40%～45%: 10%～30%: 30%～45%.
Further, the temperature of coal gas is room temperature～500 ℃, and the volumn concentration of CO is 15～38%.
Further, the exhaust temperature that flash-magnetization iron ore roasting device is discharged is 200～450 ℃, the volumn concentration < 4% of CO, O
2volumn concentration < 1%.
Further, the calorific value of the coal dust burning in hotblast stove is 3500-6500kcal/kg, and granularity is less than 100 orders.
Another aspect of the present invention, provides a kind of week reduction gas generation device, comprises producer gas generator, comprises the first entrance and gas exit, for generation of the vaporized chemical of coal gas, from the first entrance, passes into; Hotblast stove, comprises gas inlet, the second entrance, the 3rd entrance and week reduction pneumatic outlet, and gas exit is connected with the second entrance; Anaerobic is mixed wind supply equipment, is connected with the 3rd entrance, anaerobic is mixed to wind and pass in hotblast stove, and anaerobic is mixed the volumn concentration of oxygen in wind and is less than 1%.Hot blast, coal gas and anaerobic are mixed wind and are mixed in hotblast stove, and allotment hot blast, coal gas and anaerobic are mixed the volume ratio between wind, and making the temperature of the week reduction gas that makes is 600～950 ℃, and in week reduction gas, the volumn concentration of CO is 2～12%.
Further, it is nitrogen or inert gas storaging device that this anaerobic is mixed wind supply equipment, or this anaerobic to mix wind supply equipment be the chopped-off head preheater in flash-magnetization iron ore roasting device, the 3rd entrance is connected with the air outlet of chopped-off head preheater.
One side more of the present invention, provides a kind of flash-magnetization iron ore roasting system, comprises week reduction gas generation device, calciner, feeding unit and drawing mechanism, and the week reduction gas generation device adopting is above-mentioned week reduction gas generation device.
The preparation method of week reduction gas provided by the invention, device and flash-magnetization iron ore roasting system, the coal gas producing by producer gas generator provides flash-magnetization iron ore roasting needed CO; Mainly by Combustion of Hot Air Furnace coal dust, produce high-temperature hot-air and meet the needed temperature condition of flash-magnetization iron ore roasting; Pass into anaerobic and mix the air quantity that wind meets the required week reduction gas of flash-magnetization iron ore roasting, also regulate to a certain extent the temperature of week reduction gas simultaneously.Week reduction gas generation method of the present invention, device and flash-magnetization iron ore roasting system, have advantages of that stable components, less energy consumption, cost are low.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to embodiment, the present invention is further detailed explanation.
Accompanying drawing explanation
Accompanying drawing forms the part of this specification sheets, and for further understanding the present invention, accompanying drawing shows the preferred embodiments of the present invention, and is used for illustrating principle of the present invention together with specification sheets.In figure:
Fig. 1 is the week reduction gas generation schematic flow sheet of prior art;
Fig. 2 shows a kind of week reduction gas generation device schematic diagram provided by the invention;
Fig. 3 shows the week reduction gas generation device schematic diagram according to embodiment provided by the invention; And
Fig. 4 shows the connection diagram of a kind of flash-magnetization iron ore roasting system provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in embodiments of the invention is described in detail, but following embodiment and accompanying drawing are only to understand the present invention, and can not limit the present invention, the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The preparation method who the invention provides a kind of week reduction gas, the method comprises: at hotblast stove internal combustion coal dust, produce hot blast; The coal gas that producer gas generator is produced is passed in hotblast stove; Anaerobic is mixed to wind and be passed in hotblast stove, this anaerobic is mixed the volumn concentration of oxygen in wind and is less than 1%; Hot blast, coal gas and anaerobic are mixed wind and are mixed in hotblast stove; By allotment hot blast, coal gas and anaerobic, mix the volume ratio between wind, make temperature at 600～950 ℃, the week reduction gas that the volumn concentration of CO is 2～12%.Preferably, it is the tail gas that nitrogen, rare gas element or flash-magnetization iron ore roasting device are discharged that anaerobic is mixed wind, or both or three's mixed gas wherein.
An inventive concept of the present invention contribution is, produces that oxygen level is low, the hot blast of stable components at hotblast stove internal combustion coal dust, meets the desired temperature condition of week reduction gas; Producer gas generator produces coal gas, provides week reduction gas desired CO; Anaerobic is mixed wind for supplementing air quantity, also regulates to a certain extent the temperature of week reduction gas simultaneously; By controlling the ratio of three kinds of flue gases, at hotblast stove inner edge, produce hot blast limit simultaneously and carry out high temperature mixing, remaining O in flue gas while having met mixing
2with the condition that CO fully neutralizes, the inhomogeneous problem of local part having formed while having avoided flue gas to mix, has met the temperature of week reduction gas and the requirement of composition.
When flash-magnetization iron ore roasting, by allotment hot blast, coal gas and anaerobic, mix the volume ratio between wind, having made a kind of temperature is 600～950 ℃, the volumn concentration of CO is at 2～12% stable week reduction gas.
Fig. 2 further shows above-mentioned week reduction gas generation device schematic diagram.This gas generation device comprises that producer gas generator, hotblast stove and anaerobic mix wind supply equipment.Producer gas generator used in the present invention is the normally used producer gas generator in this area, those skilled in the art completely can be according to the suitable producer gas generator of selection of technical scheme provided by the invention, producer gas generator comprises the first entrance and gas exit, for generation of the vaporized chemical (air, water vapour or its gas mixture) of coal gas, from the first entrance, passes into; Hotblast stove used in the present invention is outside comprising the gas inlet of conventional Coalhotairfurnace, also comprise the second entrance, the 3rd entrance and week reduction pneumatic outlet, the gas exit of producer gas generator is connected with the second entrance of hotblast stove, and the coal gas of generation is transported in hotblast stove; Anaerobic is mixed wind supply equipment and by the 3rd entrance of hotblast stove, anaerobic is mixed to wind and be transported in hotblast stove.Coal gas, hot blast and anaerobic are mixed wind and are mixed in hotblast stove, and allotment hot blast, coal gas and anaerobic are mixed the volume ratio between wind, and making the temperature of the week reduction gas that makes is 600～950 ℃, and the volumn concentration of CO is 2～12%.
Preferably, it is the tail gas that nitrogen, rare gas element or flash-magnetization iron ore roasting device are discharged that anaerobic is mixed wind, or both or three's mixed gas wherein.When anaerobic is mixed wind and is nitrogen or rare gas element, it can be nitrogen or inert gas storaging device that anaerobic is mixed wind supply equipment, directly nitrogen or rare gas element is transported in hotblast stove; When anaerobic mix wind be flash-magnetization iron ore roasting device produce tail gas time, can adopt the device shown in Fig. 3, the tail gas that will discharge from flash-magnetization iron ore roasting device be passed into hotblast stove.By partial tail gas being blended in week reduction gas, both regulated the total blast volume of week reduction gas, reclaimed again the energy of tail gas.
By said apparatus, can be found out, at hotblast stove internal combustion coal dust, produce that oxygen level is low, the high-temperature hot-air of stable components, meet the desired temperature condition of week reduction gas; Producer gas generator produces coal gas provides week reduction gas desired CO; Anaerobic is mixed wind supply equipment provides anaerobic to mix wind, to supplement air quantity, also regulates to a certain extent the temperature of week reduction gas simultaneously.The volume ratio of mixing the exhaust gas volumn that wind supply equipment produces respectively by controlling hotblast stove, producer gas generator, anaerobic, carries out high temperature mixing, remaining O in flue gas while having met mixing simultaneously in hotblast stove
2with the condition that CO fully neutralizes, the inhomogeneous problem of local part being prone to while having avoided flue gas to mix, has met the requirement of week reduction gas temperature and composition.
Preferably, hot blast: coal gas: the volume ratio that anaerobic is mixed wind is 40%～45%: 10%～30%: 30%～45%.Under this proportional range, the volumn concentration of CO in week reduction gas can be met in 2～12% scope, and the throughput of each device can be made full use of, improve production efficiency.
Preferably, the exhaust temperature that roasting system is discharged is 200～450 ℃, the volumn concentration < 4% of CO, O
2volumn concentration < 1%.This scope is for calculating and experiment parameter, because roasting system can not seal completely and bring oxygen into, the O that contains minute quantity in the tail gas that therefore allows to discharge when the calciner preheating and baking material
2(volumn concentration < 1%), the basic not impact on reducing roasting effect.
Preferably, the gas temperature that producer gas generator produces is room temperature～500 ℃, and the volumn concentration of CO is 15～38%.CO gaseous constituent in week reduction gas is mainly derived from the coal gas that producer gas generator produces.Wherein, the device parameter that in the temperature of coal gas and coal gas, the volumn concentration of CO is producer gas generator.
Preferably, the calorific value of the coal dust burning in hotblast stove is 3500-6500kcal/kg, and granularity is less than 100 orders.The temperature condition of week reduction gas is mainly met by Combustion of Hot Air Furnace coal dust, compares with the mode with producer gas generator only, and the coal that this programme consumes is few, can adopt low grade coal, has reduced the preparation cost of week reduction gas.
The present invention also provides a kind of flash-magnetization iron ore roasting system, and as shown in Figure 4, this system comprises week reduction gas generation device, calciner, feeding unit 13 and drawing mechanism 14.This week reduction gas generation device is week reduction gas generation device provided by the invention, comprises that producer gas generator 3, hotblast stove 2 and anaerobic mix wind supply equipment.When anaerobic is mixed wind and is nitrogen or rare gas element, it can be nitrogen or inert gas storaging device that anaerobic is mixed wind supply equipment, directly nitrogen or rare gas element is transported to (not shown in Fig. 4) in hotblast stove; When anaerobic is mixed the tail gas that elegance discharges with flash-magnetization iron ore roasting device, tail gas and coal gas are passed in hotblast stove 2 simultaneously, and the hot blast producing with hotblast stove 2 combusting coal fines mixes, remaining O in flue gas while having met mixing
2with the temperature condition that CO fully neutralizes, the inhomogeneous problem of local part being prone to while having avoided flue gas to mix, thus make the more stable week reduction gas of a kind of smoke components, be conducive to improve roasting effect.
Calciner comprises stoving oven 12 and multistage preheater (wherein chopped-off head preheater is 11), and the week reduction gas of discharging from hotblast stove 2 directly passes into stoving oven 12, and the tail gas of calciner is discharged from chopped-off head preheater 11.Iron ore material from up to down flow in flash magnetization roasting system (seeing solid arrow direction indication in Fig. 4 calciner 1), bottom-up flow (the seeing dotted arrow direction indication in Fig. 4 calciner 1) of week reduction gas, flow through successively stoving oven 12 and preheater at different levels, gas and material are through after sufficient counter current contact, heat exchange and reduction reaction, the tail gas forming is discharged from the chopped-off head preheater 11 on top, wherein a part is passed in hotblast stove 2 again as return air, and all the other are emptying or make other purposes.By mix wind using partial tail gas as anaerobic, be blended in week reduction gas, both regulated the total blast volume of week reduction gas, reclaimed again the energy in tail gas.
Below with reference to embodiment 1～5, further illustrate beneficial effect of the present invention.
Embodiment 1
First in the combustion chamber of hotblast stove, carry out coal dust firing, coal dust calorific value is 3500kcal/kg, and coal powder size is-200 orders, and coal-supplying amount is 2000kg/h;
The coal gas that producer gas generator is produced passes into hotblast stove, and the gas flow that producer gas generator produces is 3000Nm
3/ h, temperature is room temperature, the volumn concentration of CO is 38%;
The partial tail gas that roasting system chopped-off head preheater is discharged imports hotblast stove, and the air quantity of tail gas is 13500Nm
3/ h, temperature is 200 ℃, the volumn concentration < 4% of CO, O
2volumn concentration < 1%.
By controlling above-mentioned processing parameter, make the gas volume ratio of mixing in hotblast stove be: hot blast: coal gas: tail gas=45%: 10%: 45%, the week reduction gas flow of hotblast stove outlet was 30000Nm
3/ h, can meet the air quantity requirement of flash-magnetization iron ore roasting technique; Temperature is 600 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced again fuel cost; The volumn concentration of CO is 8～12%, O
2volumn concentration < 0.2%, realized the composition of week reduction gas and accurately controlled and steady running.
Embodiment 2
First in the combustion chamber of hotblast stove, carry out coal dust firing, coal dust calorific value is 6500kcal/kg, coal powder size-100 order, and coal-supplying amount is 4000kg/h;
The coal gas that producer gas generator is produced passes into hotblast stove, and the gas flow that producer gas generator produces is 9000Nm
3/ h, temperature is 500 ℃, the volumn concentration of CO is 15%;
The partial tail gas of roasting system chopped-off head preheater is imported to hotblast stove, and the air quantity of tail gas is 27000Nm
3/ h, temperature is 450 ℃, the volumn concentration < 2% of CO, O
2volumn concentration < 1%.
By controlling above-mentioned processing parameter, make the gas volume ratio of mixing in hotblast stove be: hot blast: coal gas: tail gas=40%: 15%: 45%, the flow of the week reduction gas of hotblast stove outlet was 60000Nm
3/ h, can meet the air quantity requirement of flash-magnetization iron ore roasting technique; Temperature is 950 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced again fuel cost; The volumn concentration of CO is 2～6%, O
2volumn concentration < 0.2%, realized the composition of week reduction gas and accurately controlled and steady running.
Embodiment 3
First in the combustion chamber of hotblast stove, carry out coal dust firing, coal dust calorific value is 4500kcal/kg, coal powder size-140 order, and coal-supplying amount is 2000kg/h;
The coal gas that producer gas generator is produced passes into hotblast stove, and the gas flow that producer gas generator produces is 9000Nm
3/ h, temperature is 250 ℃, the volumn concentration of CO is 25%;
The partial tail gas that roasting system chopped-off head preheater is discharged imports hotblast stove, and the air quantity of tail gas is 9000Nm
3/ h, temperature is 350 ℃, the volumn concentration < 3% of CO, O
2volumn concentration < 1%.
By controlling above-mentioned processing parameter, make the gas volume ratio of mixing in hotblast stove be: hot blast: coal gas: tail gas=40%: 30%: 30%, the week reduction gas flow of hotblast stove outlet was 30000Nm
3/ h, can meet the air quantity requirement of flash-magnetization iron ore roasting technique; Temperature is 750 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced again fuel cost; The volumn concentration of CO is 6～9%, O
2volumn concentration < 0.2%, realized the composition of week reduction gas and accurately controlled and steady running.
Embodiment 4
First in the combustion chamber of hotblast stove, carry out coal dust firing, coal dust calorific value is 5500kcal/kg, coal powder size-160 order, and coal-supplying amount is 700kg/h;
The coal gas that producer gas generator is produced passes into hotblast stove, and the gas flow that producer gas generator produces is 2000Nm
3/ h, temperature is 300 ℃, the volumn concentration of CO is 30%;
Nitrogen is imported to hotblast stove, and the air quantity of nitrogen is 3500Nm
3/ h, temperature is room temperature, O
2volumn concentration < 1%.
By controlling above-mentioned processing parameter, make the gas volume ratio of mixing in hotblast stove be: hot blast: coal gas: nitrogen=45%: 20%: 35%, the flow of the week reduction gas of hotblast stove outlet was 10000Nm
3/ h, can meet the air quantity requirement of flash-magnetization iron ore roasting technique; Temperature is 800 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced again fuel cost; The volumn concentration of CO is 5～7%, O
2volumn concentration < 0.2%, realized the composition of week reduction gas and accurately controlled and steady running.
Embodiment 5
First in the combustion chamber of hotblast stove, carry out coal dust firing, coal dust calorific value is 5000kcal/kg, coal powder size-100 order, and coal-supplying amount is 2800kg/h;
The coal gas that producer gas generator is produced passes into hotblast stove, and the gas flow that producer gas generator produces is 9000Nm
3/ h, temperature is 400 ℃, the volumn concentration of CO is 20%;
Nitrogen is imported to hotblast stove, and the air quantity of nitrogen is 17100Nm
3/ h, temperature is room temperature, O
2volumn concentration < 1%.
By controlling above-mentioned processing parameter, make the gas volume ratio of mixing in hotblast stove be: hot blast: coal gas: nitrogen=42%: 20%: 38%, the flow of the week reduction gas of hotblast stove outlet was 45000Nm
3/ h, can meet the air quantity requirement of flash-magnetization iron ore roasting technique; Temperature is 700 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced again fuel cost; The volumn concentration of CO is 3～5%, O
2volumn concentration < 0.2%, realized the composition of week reduction gas and accurately controlled and steady running.
In summary, the week reduction gas of the embodiment of the present invention 1～5 preparation meets the required temperature condition of flash-magnetization iron ore roasting, the volumn concentration of CO and the requirement of total blast volume, and has the following advantages:
1. at hotblast stove internal combustion coal dust, produce that oxygen level is low, the hot blast of stable components, meet the desired temperature condition of week reduction gas, compared with the mode of only using producer gas generator, cost is much lower, thereby has reduced the preparation cost of week reduction gas.
2. by a certain proportion of coal gas amount of preparation, can realize the accurate control to the volumn concentration of CO in week reduction gas.
3. by anaerobic is mixed to wind, pass into hotblast stove, supplemented air quantity, regulated the total blast volume of week reduction gas, also regulated to a certain extent the temperature of week reduction gas simultaneously.
4. in the tail gas that calciner produces, contain a small amount of unreacted CO gas, there is certain heat, by partial tail gas being blended in week reduction gas, both regulated the total blast volume of week reduction gas, reclaimed again the energy of tail gas.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a preparation method for week reduction gas, is characterized in that, described preparation method comprises:
At hotblast stove internal combustion coal dust, produce hot blast;
The coal gas that producer gas generator is produced is passed in described hotblast stove;
Anaerobic is mixed to wind and be passed in described hotblast stove, described anaerobic is mixed the volumn concentration of oxygen in wind and is less than 1%;
The calorific value of the coal dust burning in described hotblast stove is 3500-6500kcal/kg, and granularity is less than 100 orders;
Described hot blast, described coal gas and described anaerobic are mixed wind and are mixed in described hotblast stove, allocate described hot blast, described coal gas and described anaerobic and mix the volume ratio between wind, the volume ratio that described hot blast, described coal gas and described anaerobic are mixed wind is: hot blast: coal gas: anaerobic is mixed wind=40%～45%:10%～30%:30%～45%, the temperature of described coal gas is room temperature～500 ℃, in described coal gas, the volumn concentration of CO is 15～38%, making temperature is 600～950 ℃, the week reduction gas that the volumn concentration of CO is 2～12%.
2. preparation method according to claim 1, is characterized in that, it is the tail gas that nitrogen, rare gas element or flash-magnetization iron ore roasting device are discharged that described anaerobic is mixed wind, or both or three's mixed gas wherein.
3. preparation method according to claim 2, is characterized in that, the exhaust temperature that described flash-magnetization iron ore roasting device is discharged is 200～450 ℃, the volumn concentration < 4% of CO in described tail gas, O in described tail gas
2volumn concentration < 1%.
4. a week reduction gas generation device, is characterized in that, comprising:
Producer gas generator, comprises the first entrance and gas exit, for generation of the vaporized chemical of coal gas, from described the first entrance, passes into;
Hotblast stove, comprises gas inlet, the second entrance, the 3rd entrance and week reduction pneumatic outlet, and described gas exit is connected with described the second entrance;
Anaerobic is mixed wind supply equipment, is connected with described the 3rd entrance, anaerobic is mixed to wind and pass in described hotblast stove, and described anaerobic is mixed the volumn concentration of oxygen in wind and is less than 1%, wherein,
The calorific value of the coal dust burning in described hotblast stove is 3500-6500kcal/kg, and granularity is less than 100 orders;
Described hot blast, described coal gas and described anaerobic are mixed wind and are mixed in described hotblast stove, allocate described hot blast, described coal gas and described anaerobic are mixed the volume ratio between wind, described hot blast, the volume ratio that described coal gas and described anaerobic are mixed wind is: hot blast: coal gas: anaerobic is mixed wind=40%～45%:10%～30%:30%～45%, the temperature of described coal gas is room temperature～500 ℃, in described coal gas, the volumn concentration of CO is 15～38%, making the temperature of the described week reduction gas that makes is 600～950 ℃, in described week reduction gas, the volumn concentration of CO is 2～12%.
5. preparation facilities according to claim 4, it is characterized in that, it is nitrogen or inert gas storaging device that described anaerobic is mixed wind supply equipment, or it is the chopped-off head preheater in flash-magnetization iron ore roasting device that described anaerobic is mixed wind supply equipment, described the 3rd entrance is connected with the air outlet of described chopped-off head preheater.
6. a flash-magnetization iron ore roasting system, comprises week reduction gas generation device, calciner, feeding unit and drawing mechanism, it is characterized in that, described week reduction gas generation device is week reduction gas generation device claimed in claim 4.
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| CN108239700B (en) * | 2018-03-07 | 2023-11-28 | 长沙矿冶研究院有限责任公司 | Coal-based fluidization reduction roasting system and roasting method thereof |
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