CN102560091A - 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
- Publication number
- CN102560091A CN102560091A CN2012100444319A CN201210044431A CN102560091A CN 102560091 A CN102560091 A CN 102560091A CN 2012100444319 A CN2012100444319 A CN 2012100444319A CN 201210044431 A CN201210044431 A CN 201210044431A CN 102560091 A CN102560091 A CN 102560091A
- Authority
- CN
- China
- Prior art keywords
- gas
- anaerobic
- preparation
- mixed
- wind
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 185
- 239000003034 coal gas Substances 0.000 claims abstract description 54
- 230000009467 reduction Effects 0.000 claims description 82
- 230000005415 magnetization Effects 0.000 claims description 36
- 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 22
- 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
- 239000003245 coal Substances 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 9
- 239000000843 powder Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000002156 mixing Methods 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 19
- 238000005516 engineering process Methods 0.000 description 10
- 230000002829 reductive effect Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010304 firing Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000008676 import Effects 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
- 230000002950 deficient 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
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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 the iron ore magnetic roasting field, especially relate to a kind of preparation method, device and iron ore flash magnetization roasting system of week reduction gas.
Background technology
The flash magnetization roasting technology is with the ferric oxide ores such as limonite of the difficult choosing of powdery, in week reduction gas, through the roasting of multi-stage circulating-flow attitude, again through low intensity magnetic separation, obtains high-grade iron ore concentrate.Under the stable situation in fluidised form field, the main technologic parameters that influences the magnetizing roasting reduction effect is: the CO concentration in the 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 iron in the melting waste slag is reclaimed in the flash boiling magnetizing roasting "; As shown in Figure 1, the used gas of flash magnetization roasting mixes acquisition by following two-way gas in this method: the coal gas B that burning 20-50mm coal grain produces in high-temperature flue gas A that the following coal grain of burning 10mm produces in the fluidizing furnace and the producer gas generator; The volume mixture ratio of flue gas A and coal gas B is 1: 1～1: 2.5.This method needs a large amount of air to make the coal dust boiling when using boiling furnace combustion; Used air is much larger than the required air of burning; So always contain a large amount of oxygen in the flue gas that produces, in flue gas A and coal gas B N-process, need the amount of extra increase coal gas B come in flue gas A in oxygen; Increase the preparation cost of coal gas B, and then increased the production cost of flash magnetization roasting.
Certainly, only make combustion gas and reductive agent and feed roasting system and also can produce week reduction gas, but still have the problem that energy consumption is high, cost is high with coal gas.
In the heavy industrialization of flash magnetization roasting technology is used; Press for and obtain stable components, easy to adjust and a large amount of week reduction gases that production cost is low; And still there are defectives such as preparation poor controllability, cost height in existing week reduction gas preparation method and control method; This problem is outstanding day by day, needs to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of preparation method, device and iron ore flash magnetization roasting system of week reduction gas, be used for solving the problem that the used week reduction gas of flash magnetization roasting technology 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: produce hot blast at hotblast stove internal combustion coal dust; The coal gas that producer gas generator is produced is passed in the hotblast stove; Anaerobic is mixed wind be passed in the hotblast stove, this anaerobic is mixed the volumn concentration of oxygen in the wind less than 1%; Hot blast, coal gas and anaerobic are mixed wind and in hotblast stove, are mixed; Mix the volume ratio between the wind through allotment hot blast, coal gas and anaerobic, making temperature is 600～950 ℃, and the volumn concentration of CO is 2～12% week reduction gas.
Further, it is the tail gas that nitrogen, rare gas element or iron ore flash magnetization 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 be: hot blast: coal gas: anaerobic is mixed wind=40%～45%: 10%～30%: 30%～45%.
Further, temperature of gas is room temperature～500 ℃, and the volumn concentration of CO is 15～38%.
Further, the exhaust temperature that iron ore flash magnetization roasting device is discharged is 200～450 ℃, the volumn concentration of CO＜4%, O
2Volumn concentration＜1%.
Further, the calorific value of incendiary coal dust is 3500-6500kcal/kg in hotblast stove, and granularity is less than 100 orders.
Another aspect of the present invention provides a kind of week reduction gas preparation facilities, comprises producer gas generator, comprises first inlet and the gas exit, and the vaporized chemical that is used to produce coal gas is from the first inlet feeding; Hotblast stove comprises gas inlet, second inlet, the 3rd inlet and week reduction pneumatic outlet, and gas exit is connected with second inlet; Anaerobic is mixed the wind supply equipment, is connected with the 3rd inlet, anaerobic is mixed wind feed in the hotblast stove, and anaerobic is mixed the volumn concentration of oxygen in the wind less than 1%.Hot blast, coal gas and anaerobic are mixed wind and in hotblast stove, are mixed, and allotment hot blast, coal gas and anaerobic are mixed the volume ratio between the wind, and the temperature that makes the week reduction gas that makes is 600～950 ℃, and the volumn concentration of CO is 2～12% in the week reduction gas.
Further, it is nitrogen or inert gas storaging device that this anaerobic is mixed the wind supply equipment, and perhaps to mix the wind supply equipment be the chopped-off head preheater in the iron ore flash magnetization roasting device to this anaerobic, and the 3rd inlet is connected with the air outlet of chopped-off head preheater.
Of the present inventionly more on the one hand a kind of iron ore flash magnetization roasting system is provided, has comprised week reduction gas preparation facilities, calciner, feeding unit and drawing mechanism, the week reduction gas preparation facilities that is adopted is above-mentioned week reduction gas preparation facilities.
The preparation method of week reduction gas provided by the invention, device and iron ore flash magnetization roasting system, the coal gas that produces through producer gas generator provides the iron ore flash magnetization roasting needed CO; Mainly produce high-temperature hot-air and satisfy the needed temperature condition of iron ore flash magnetization roasting through the Combustion of Hot Air Furnace coal dust; Feed anaerobic and mix the air quantity that wind satisfies the required week reduction gas of iron ore flash magnetization roasting, the temperature of also regulating week reduction gas to a certain extent simultaneously.Week reduction gas preparation method of the present invention, device and iron ore flash magnetization roasting system have stable components, less energy consumption, advantage that cost is low.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to embodiment below.
Description of drawings
Accompanying drawing constitutes the part of this specification sheets, is used for further understanding the present invention, and accompanying drawing shows the preferred embodiments of the present invention, and is used for explaining principle of the present invention with specification sheets.Among the figure:
Fig. 1 is the week reduction gas generation schematic flow sheet of prior art;
Fig. 2 shows a kind of week reduction gas preparation facilities synoptic diagram provided by the invention;
Fig. 3 shows the week reduction gas preparation facilities synoptic diagram according to embodiment provided by the invention; And
Fig. 4 shows the connection synoptic diagram of a kind of iron ore flash magnetization roasting provided by the invention system.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiments of the invention is carried out detailed explanation; But following embodiment and accompanying drawing only are in order 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 invention provides a kind of preparation method of week reduction gas, this method comprises: produce hot blast at hotblast stove internal combustion coal dust; The coal gas that producer gas generator is produced is passed in the hotblast stove; Anaerobic is mixed wind be passed in the hotblast stove, this anaerobic is mixed the volumn concentration of oxygen in the wind less than 1%; Hot blast, coal gas and anaerobic are mixed wind and in hotblast stove, are mixed; Mix the volume ratio between the wind through allotment hot blast, coal gas and anaerobic, make temperature at 600～950 ℃, the volumn concentration of CO is 2～12% week reduction gas.Preferably, it is the tail gas that nitrogen, rare gas element or iron ore flash magnetization 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 at hotblast stove internal combustion coal dust that oxygen level is low, the hot blast of stable components, satisfies the desired temperature condition of week reduction gas; Producer gas generator produces coal gas, provides week reduction gas desired CO; Anaerobic is mixed wind and is used for replenishing air quantity, the temperature of also regulating week reduction gas to a certain extent simultaneously; Through controlling the ratio of three kinds of flue gases, produce the hot blast limit at the hotblast stove inner edge simultaneously and carry out high temperature mixing, remaining O in the flue gas when having satisfied mixing
2With the abundant neutral condition of CO, the problem of the local uneven components that has formed when having avoided flue gas to mix has satisfied the temperature of week reduction gas and the requirement of composition.
When the iron ore flash magnetization roasting, mix the volume ratio between the wind through allotment hot blast, coal gas and anaerobic, 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 preparation facilities synoptic diagram.This gas preparation facilities comprises that producer gas generator, hotblast stove and anaerobic mix the 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 fully can be according to the suitable producer gas generator of selection of technical scheme provided by the invention; Producer gas generator comprises first inlet and the gas exit, and the vaporized chemical (air, water vapour or its gas mixture) that is used to produce coal gas feeds from first inlet; Hotblast stove used in the present invention is outside the gas inlet that comprises conventional Coalhotairfurnace; Also comprise second inlet, the 3rd inlet and week reduction pneumatic outlet; The gas exit of producer gas generator is connected with second inlet of hotblast stove, and the coal gas that produces is transported in the hotblast stove; Anaerobic is mixed the wind supply equipment and anaerobic is mixed wind is transported in the hotblast stove through the 3rd inlet of hotblast stove.Coal gas, hot blast and anaerobic are mixed wind and in hotblast stove, are mixed, and allotment hot blast, coal gas and anaerobic are mixed the volume ratio between the wind, and the temperature that makes 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 iron ore flash magnetization roasting device are discharged that anaerobic is mixed wind, or both or three's mixed gas wherein.When anaerobic was mixed wind and is nitrogen or rare gas element, it can be nitrogen or inert gas storaging device that anaerobic is mixed the wind supply equipment, directly nitrogen or rare gas element is transported in the hotblast stove; When anaerobic mix wind be iron ore flash magnetization roasting device produce tail gas the time, can adopt device shown in Figure 3, will be passed into the hotblast stove from the tail gas that iron ore flash magnetization roasting device is discharged.Through part tail gas is blended in the week reduction gas, both regulated the total blast volume of week reduction gas, reclaimed the energy of tail gas again.
Can find out by said apparatus, produce at hotblast stove internal combustion coal dust that oxygen level is low, the high-temperature hot-air of stable components, satisfy the desired temperature condition of week reduction gas; Producer gas generator produces coal gas provides week reduction gas desired CO; Anaerobic is mixed the wind supply equipment provides anaerobic to mix wind, to replenish air quantity, the temperature of also regulating week reduction gas to a certain extent simultaneously.Mix the volume ratio of the exhaust gas volumn that the wind supply equipment produces respectively through control hotblast stove, producer gas generator, anaerobic, in hotblast stove, carry out high temperature simultaneously and mix remaining O in the flue gas when having satisfied mixing
2With the abundant neutral condition of CO, the problem of the local uneven components that has been prone to when having avoided flue gas to mix has satisfied 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 that can satisfy CO in the week reduction gas and can make full use of the throughput of each device in 2～12% scope, improve the production efficiency.
Preferably, the exhaust temperature that roasting system is discharged is 200～450 ℃, the volumn concentration of CO＜4%, O
2Volumn concentration＜1%.This scope because roasting system can not seal and when calciner preheating and baking material, bring into oxygen fully, contains the O of minute quantity for calculating and experiment parameter in the tail gas that therefore allows to discharge
2(volumn concentration＜1%) is to the basic not influence of 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 the week reduction gas is mainly derived from the coal gas that producer gas generator produces.Wherein, the volumn concentration of CO is the device parameter of producer gas generator in temperature of gas and the coal gas.
Preferably, the calorific value of incendiary coal dust is 3500-6500kcal/kg in hotblast stove, and granularity is less than 100 orders.The temperature condition of week reduction gas is mainly satisfied by the Combustion of Hot Air Furnace coal dust, and only compares with the mode of producer gas generator, and the coal of this programme consumption is few, can adopt low grade coal, has reduced the preparation cost of week reduction gas.
The present invention also provides a kind of iron ore flash magnetization roasting system, and is as shown in Figure 4, and this system comprises week reduction gas preparation facilities, calciner, feeding unit 13 and drawing mechanism 14.This week reduction gas preparation facilities is a week reduction gas preparation facilities provided by the invention, comprises that producer gas generator 3, hotblast stove 2 and anaerobic mix the wind supply equipment.When anaerobic was mixed wind and is nitrogen or rare gas element, it can be nitrogen or inert gas storaging device that anaerobic is mixed the wind supply equipment, directly nitrogen or rare gas element is transported to (not shown among Fig. 4) in the hotblast stove; When anaerobic was mixed the tail gas that elegance discharges with iron ore flash magnetization roasting device, tail gas and coal gas were passed in the hotblast stove 2 simultaneously, mix remaining O in the flue gas when having satisfied mixing with the hot blast of hotblast stove 2 combusting coal fines generation
2With the abundant neutral temperature condition of CO, the problem of the local uneven components that has been prone to when having avoided flue gas to mix, thus make the more stable week reduction gas of a kind of smoke components, help improving roasting effect.
Calciner comprises stoving oven 12 and multistage preheater (wherein the chopped-off head preheater is 11), and the week reduction gas of discharging from hotblast stove 2 directly feeds stoving oven 12, and the tail gas of calciner is discharged from chopped-off head preheater 11.Iron ore material in the flash magnetization roasting system, from up to down flow (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 stoving oven 12 and preheaters at different levels successively; Gas and material are through after sufficient counter current contact, heat exchange and the reduction reaction; The tail gas that forms is discharged from the chopped-off head preheater 11 on top, and wherein a part is passed in the hotblast stove 2 as return air again, all the other emptyings or make other purposes.Be blended in the week reduction gas through part tail gas is mixed wind as anaerobic, both regulated the total blast volume of week reduction gas, reclaimed the energy in the tail gas again.
Below will combine embodiment 1～5 to further specify beneficial effect of the present invention.
At first carry out coal dust firing in the combustion chamber of hotblast stove, the 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 feeds hotblast stove, and the gas flow that producer gas generator produces is 3000Nm
3/ h, temperature is a room temperature, the volumn concentration of CO is 38%;
The part 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 of CO＜4%, O
2Volumn concentration＜1%.
Through controlling above-mentioned processing parameter, make that blended gas volume ratio is in hotblast stove: hot blast: coal gas: tail gas=45%: 10%: 45%, the week reduction gas flow of hotblast stove outlet is 30000Nm
3/ h can satisfy the air quantity requirement of iron ore flash magnetization roasting technology; Temperature is 600 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced fuel cost again; The volumn concentration of CO is 8～12%, O
2Volumn concentration＜0.2%, realized the accurately control and the steady running of composition of week reduction gas.
At first carry out coal dust firing in the combustion chamber of hotblast stove, the coal dust calorific value is 6500kcal/kg, and coal powder size-100 order, coal-supplying amount are 4000kg/h;
The coal gas that producer gas generator is produced feeds 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 part tail gas of roasting system chopped-off head preheater is imported hotblast stove, and the air quantity of tail gas is 27000Nm
3/ h, temperature is 450 ℃, the volumn concentration of CO＜2%, O
2Volumn concentration＜1%.
Through controlling above-mentioned processing parameter, make that blended gas volume ratio is in hotblast stove: hot blast: coal gas: tail gas=40%: 15%: 45%, the flow of the week reduction gas of hotblast stove outlet is 60000Nm
3/ h can satisfy the air quantity requirement of iron ore flash magnetization roasting technology; Temperature is 950 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced fuel cost again; The volumn concentration of CO is 2～6%, O
2Volumn concentration＜0.2%, realized the accurately control and the steady running of composition of week reduction gas.
Embodiment 3
At first carry out coal dust firing in the combustion chamber of hotblast stove, the coal dust calorific value is 4500kcal/kg, and coal powder size-140 order, coal-supplying amount are 2000kg/h;
The coal gas that producer gas generator is produced feeds 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 part 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 of CO＜3%, O
2Volumn concentration＜1%.
Through controlling above-mentioned processing parameter, make that blended gas volume ratio is in hotblast stove: hot blast: coal gas: tail gas=40%: 30%: 30%, the week reduction gas flow of hotblast stove outlet is 30000Nm
3/ h can satisfy the air quantity requirement of iron ore flash magnetization roasting technology; Temperature is 750 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced fuel cost again; The volumn concentration of CO is 6～9%, O
2Volumn concentration＜0.2%, realized the accurately control and the steady running of composition of week reduction gas.
Embodiment 4
At first carry out coal dust firing in the combustion chamber of hotblast stove, the coal dust calorific value is 5500kcal/kg, and coal powder size-160 order, coal-supplying amount are 700kg/h;
The coal gas that producer gas generator is produced feeds 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 hotblast stove, and the air quantity of nitrogen is 3500Nm
3/ h, temperature is a room temperature, O
2Volumn concentration＜1%.
Through controlling above-mentioned processing parameter, make that blended gas volume ratio is in hotblast stove: hot blast: coal gas: nitrogen=45%: 20%: 35%, the flow of the week reduction gas of hotblast stove outlet is 10000Nm
3/ h can satisfy the air quantity requirement of iron ore flash magnetization roasting technology; Temperature is 800 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced fuel cost again; The volumn concentration of CO is 5～7%, O
2Volumn concentration＜0.2%, realized the accurately control and the steady running of composition of week reduction gas.
Embodiment 5
At first carry out coal dust firing in the combustion chamber of hotblast stove, the coal dust calorific value is 5000kcal/kg, and coal powder size-100 order, coal-supplying amount are 2800kg/h;
The coal gas that producer gas generator is produced feeds 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 hotblast stove, and the air quantity of nitrogen is 17100Nm
3/ h, temperature is a room temperature, O
2Volumn concentration＜1%.
Through controlling above-mentioned processing parameter, make that blended gas volume ratio is in hotblast stove: hot blast: coal gas: nitrogen=42%: 20%: 38%, the flow of the week reduction gas of hotblast stove outlet is 45000Nm
3/ h can satisfy the air quantity requirement of iron ore flash magnetization roasting technology; Temperature is 700 ℃, has both reached the temperature requirement of magnetizing roasting, has reduced fuel cost again; The volumn concentration of CO is 3～5%, O
2Volumn concentration＜0.2%, realized the accurately control and the steady running of composition of week reduction gas.
Can know that to sum up the week reduction gas of the embodiment of the invention 1～5 preparation satisfies the volumn concentration of the required temperature condition of iron ore flash magnetization roasting, CO and the requirement of total blast volume, and has the following advantages:
1. produce at hotblast stove internal combustion coal dust that oxygen level is low, the hot blast of stable components, satisfy 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. through a certain proportion of coal gas amount of preparation, can realize accurate control to the volumn concentration of CO in the week reduction gas.
3. feed hotblast stove through anaerobic being mixed wind, replenished air quantity, regulated the total blast volume of week reduction gas, the temperature of also having regulated week reduction gas to a certain extent simultaneously.
4. contain a small amount of unreacted CO gas in the tail gas that calciner produces, have certain heat,, both regulated the total blast volume of week reduction gas, reclaimed the energy of tail gas again through part tail gas is blended in the week reduction gas.
More than be merely 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 changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the preparation method of a week reduction gas is characterized in that, said preparation method comprises:
Produce hot blast at hotblast stove internal combustion coal dust;
The coal gas that producer gas generator is produced is passed in the said hotblast stove;
Anaerobic is mixed wind be passed in the said hotblast stove, said anaerobic is mixed the volumn concentration of oxygen in the wind less than 1%;
Said hot blast, said coal gas and said anaerobic are mixed wind and in said hotblast stove, are mixed; Allocate said hot blast, said coal gas and said anaerobic and mix the volume ratio between the wind; Making temperature is 600～950 ℃, and the volumn concentration of CO is 2～12% week reduction gas.
2. preparation method according to claim 1 is characterized in that, it is the tail gas that nitrogen, rare gas element or iron ore flash magnetization roasting device are discharged that said anaerobic is mixed wind, or both or three's mixed gas wherein.
3. preparation method according to claim 1 and 2 is characterized in that, the volume ratio that said hot blast, said coal gas and said anaerobic are mixed wind is: hot blast: coal gas: anaerobic is mixed wind=40%～45%: 10%～30%: 30%～45%.
4. preparation method according to claim 3 is characterized in that, said temperature of gas is room temperature～500 ℃, and the volumn concentration of CO is 15～38% in the said coal gas.
5. preparation method according to claim 2 is characterized in that, the exhaust temperature that said iron ore flash magnetization roasting device is discharged is 200～450 ℃, the volumn concentration of CO＜4% in the said tail gas, O in the said tail gas
2Volumn concentration＜1%.
6. preparation method according to claim 1 is characterized in that, the calorific value of incendiary coal dust is 3500-6500kcal/kg in said hotblast stove, and granularity is less than 100 orders.
7. a week reduction gas preparation facilities is characterized in that, comprising:
Producer gas generator comprises first inlet and the gas exit, and the vaporized chemical that is used to produce coal gas is from the said first inlet feeding;
Hotblast stove comprises gas inlet, second inlet, the 3rd inlet and week reduction pneumatic outlet, and said gas exit is connected with said second inlet;
Anaerobic is mixed the wind supply equipment, is connected with said the 3rd inlet, anaerobic is mixed wind feed in the said hotblast stove, and said anaerobic is mixed the volumn concentration of oxygen in the wind less than 1%, wherein,
Said hot blast, said coal gas and said anaerobic are mixed wind and in said hotblast stove, are mixed; Allocate said hot blast, said coal gas and said anaerobic and mix the volume ratio between the wind; The temperature that makes the said week reduction gas that makes is 600～950 ℃, and the volumn concentration of CO is 2～12% in the said week reduction gas.
8. preparation facilities according to claim 7; It is characterized in that; It is nitrogen or inert gas storaging device that said anaerobic is mixed the wind supply equipment; It is the chopped-off head preheater in the iron ore flash magnetization roasting device that perhaps said anaerobic is mixed the wind supply equipment, and said the 3rd inlet is connected with the air outlet of said chopped-off head preheater.
9. an iron ore flash magnetization roasting system comprises week reduction gas preparation facilities, calciner, feeding unit and drawing mechanism, it is characterized in that, said week reduction gas preparation facilities is the described week reduction gas of claim 7 preparation facilities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210044431.9A CN102560091B (en) | 2012-02-24 | 2012-02-24 | Preparation method and preparation device for weak reducing gas and flash-magnetization iron ore roasting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210044431.9A CN102560091B (en) | 2012-02-24 | 2012-02-24 | Preparation method and preparation device for weak reducing gas and flash-magnetization iron ore roasting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102560091A true CN102560091A (en) | 2012-07-11 |
| CN102560091B CN102560091B (en) | 2014-01-22 |
Family
ID=46406689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210044431.9A Expired - Fee Related CN102560091B (en) | 2012-02-24 | 2012-02-24 | Preparation method and preparation device for weak reducing gas and flash-magnetization iron ore roasting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102560091B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103695646A (en) * | 2013-11-27 | 2014-04-02 | 灵宝金源矿业股份有限公司 | Method for recovery of gold, silver and iron from gold smelting waste residue |
| CN106669962A (en) * | 2016-12-30 | 2017-05-17 | 四川玖长科技有限公司 | Beneficiation method and system for calcium or calcareous and siliceous phosphorite and application method of beneficiation system |
| CN107130103A (en) * | 2017-06-30 | 2017-09-05 | 江苏省冶金设计院有限公司 | Hematite-type hardly possible ore dressing and the processing system and processing method of waste residue |
| CN108239700A (en) * | 2018-03-07 | 2018-07-03 | 长沙矿冶研究院有限责任公司 | A kind of coal base fluidization reduction roasting system and its method of roasting |
| CN112985064A (en) * | 2021-02-05 | 2021-06-18 | 陕西翼飞航智能科技有限公司 | Sintering device and sintering method based on plasma hot blast stove |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575668A (en) * | 2009-06-19 | 2009-11-11 | 灵宝市金源矿业有限责任公司 | Method for recovering iron in melting waste slag through flash boiling magnetizing roasting |
-
2012
- 2012-02-24 CN CN201210044431.9A patent/CN102560091B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575668A (en) * | 2009-06-19 | 2009-11-11 | 灵宝市金源矿业有限责任公司 | Method for recovering iron in melting waste slag through flash boiling magnetizing roasting |
Non-Patent Citations (2)
| Title |
|---|
| 《金属矿山》 20091231 刘小银等 大西沟菱铁矿闪速磁化焙烧-磁选探索试验 第1、3节和图1 1-9 , * |
| 刘小银等: "大西沟菱铁矿闪速磁化焙烧—磁选探索试验", 《金属矿山》, 31 December 2009 (2009-12-31) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103695646A (en) * | 2013-11-27 | 2014-04-02 | 灵宝金源矿业股份有限公司 | Method for recovery of gold, silver and iron from gold smelting waste residue |
| CN103695646B (en) * | 2013-11-27 | 2015-06-10 | 灵宝金源矿业股份有限公司 | Method for recovery of gold, silver and iron from gold smelting waste residue |
| CN106669962A (en) * | 2016-12-30 | 2017-05-17 | 四川玖长科技有限公司 | Beneficiation method and system for calcium or calcareous and siliceous phosphorite and application method of beneficiation system |
| CN106669962B (en) * | 2016-12-30 | 2019-10-29 | 四川玖长科技有限公司 | A kind of application method for the beneficiation method of the siliceous phosphorus ore of calcareous or calcium, ore-sorting system and ore-sorting system |
| CN107130103A (en) * | 2017-06-30 | 2017-09-05 | 江苏省冶金设计院有限公司 | Hematite-type hardly possible ore dressing and the processing system and processing method of waste residue |
| CN108239700A (en) * | 2018-03-07 | 2018-07-03 | 长沙矿冶研究院有限责任公司 | A kind of coal base fluidization reduction roasting system and its method of roasting |
| 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 |
| CN112985064A (en) * | 2021-02-05 | 2021-06-18 | 陕西翼飞航智能科技有限公司 | Sintering device and sintering method based on plasma hot blast stove |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102560091B (en) | 2014-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104131122B (en) | A kind of iron-smelting process based on winding-up coal gas of high temperature | |
| CN102560091B (en) | Preparation method and preparation device for weak reducing gas and flash-magnetization iron ore roasting system | |
| CN204981930U (en) | It is complete coal -based from heat supply direct reduction shaft furnace | |
| CN102092787B (en) | Method for continuously synthesizing vanadium trioxide | |
| CN106854684B (en) | One kind being used for iron ore magnetizing roast tunnel oven and iron ore magnetizing roast method | |
| CN105164284B (en) | Method and apparatus for producing titanium slag by ilmenite | |
| CN101538630A (en) | Process and device for preparing chromium iron by using chromium ore powder | |
| CN105219953B (en) | A kind of ferric manganese ore powder sintering matches somebody with somebody the method for ore deposit | |
| CN105036132B (en) | The method for preparing calcium carbide | |
| CN101723610B (en) | Clinker method calcining cement clinker by using predecomposition technology of completely replacing calcareous raw material with wet type acetylene sludge | |
| CN105776218A (en) | Calcium carbide preparation system and method | |
| CN105039628A (en) | Full-coal-based self-heat-supply direct reduction process and shaft furnace | |
| CN203284438U (en) | Magnetizing roasting reducing atmosphere preparation device and iron mine flash magnetizing roasting system | |
| CN104745806A (en) | Refractory low-grade iron ore shaft furnace semi-coke added magnetizing roast process | |
| CN102967145B (en) | Decomposing furnace for reducing NOX emission used in cement industry | |
| CN209669074U (en) | A kind of powdered lime preparation system | |
| CN110006030B (en) | Device and method for efficient burnout and low-nitrogen reduction of pulverized coal pre-pyrolysis | |
| CN209588733U (en) | Furnace charge multi-stage separation heating device for DC-ore-heating furnace molten charge | |
| CN208218697U (en) | A kind of high activity MgO roasting dedicated unit | |
| CN103011164B (en) | Method for preparing calcium carbide and synthetic gas via flameless oxidation heating method, and calcium carbide reactor | |
| CN109809717A (en) | A kind of powdered lime preparation system | |
| CN106017093B (en) | For preparing the calciner of rare earth oxide | |
| CN105174756A (en) | Method for preparing cement from manganese iron slag | |
| CN102146490A (en) | Reduction iron making method and device | |
| CN205635666U (en) | Vanadium titano -magnetite or ilmenite reducing smelting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 |