CN203904284U - System for preparing reducing gas for shaft furnace through catalysis and gasification of coal - Google Patents

System for preparing reducing gas for shaft furnace through catalysis and gasification of coal Download PDF

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CN203904284U
CN203904284U CN201420247414.XU CN201420247414U CN203904284U CN 203904284 U CN203904284 U CN 203904284U CN 201420247414 U CN201420247414 U CN 201420247414U CN 203904284 U CN203904284 U CN 203904284U
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reducing gas
gas
waste heat
coal
outlet
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吴道洪
史雪君
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Beijing Shenwu Environmental and Energy Technology Co Ltd
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Beijing Shenwu Environmental and Energy Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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Abstract

The utility model discloses a system for preparing reducing gas for a shaft furnace through the catalysis and gasification of coal. The system comprises a heat accumulation type thermal decomposition furnace, a waste heat boiler and a purification device, wherein the heat accumulation type thermal decomposition furnace is provided with a powdery coal catalyzer particle inlet, a steam inlet and a crude reducing gas outlet; the waste heat boiler is provided with a hot reducing gas inlet, a cold reducing gas outlet and a steam outlet, and the hot reducing gas inlet is connected with the crude reducing gas outlet; the purification device is connected with the waste heat boiler, and is suitable for purifying the crude reducing gas subjected to waste heat recovery, so as to obtain fine reducing gas. The gasification temperature can be lowered via the system, energy consumption is reduced, and the prepared reducing gas can meet the requirement for the reducing gas in case that a gas-based shaft furnace is used for refining sponge iron.

Description

Catalytic coal gasifaction is prepared the system of reducing gas for shaft furnace
Technical field
The utility model relates to a kind of gas-based shaft kiln reducing gas preparation technology, particularly produces the supporting catalytic coal gasifaction of sponge iron with gas-based shaft kiln and prepares the system of reducing gas for shaft furnace.
Background technology
Direct reduction processes of Iron ores mainly contains gas base (with CO+H 2for reductive agent) and coal-based (take mill coal as reductive agent) two kinds.The gas base directly reducing method mainstream technology that capacity utilization is high, thermo-efficiency is high because having, productivity advantages of higher becomes mill coal metallurgical technology.
At present, the mode of external multiplex gas renormalizing reducing gas processed provides CO+H 2as reducing gas.With abroad compare, owing to being subject to the restriction of natural gas source, China does not have large-scale shaft furnace process to produce direct-reduction ironworks so far.Comparatively speaking, rich coal resources in China, the level of resources utilization of coal is lower, if will carry out deep purifying desulfurization processing after gasification as unstripped gas, then mixes with appropriate water vapour etc., enters shift converter and carries out transformationreation and can obtain H 2the H of the ratio of/CO between 4.6～1.5:1 (volume ratio) 2gas mixture with CO.This gas mixture can be used as the reducing gas that direct-reduction is produced sponge iron, and has the advantages such as cheap.
At present, the gasification temperature of the coal gasifying process of comparative maturity is generally more than 1000 ℃, and along with the development of gasification, coal gasifying process more and more approaches the prior art limit of High Temperature High Pressure, to promote to greatest extent gasification reaction, thus performance scale operation effect.Along with gasification temperature increases, need to consume more coal and maintain high-temperature gasification state, and the gas products of producing is because temperature is high, in temperature-fall period, can more bring more power loss, CO content in coal gas is very high simultaneously, in the technique of producing synthesis gas or hydrogen, CO must be converted, cause complex energy utilising efficiency low, these explained hereafter synthetic gas all need pure oxygen to participate in reaction simultaneously, and the preparation of pure oxygen needs expensive air separation plant investment and higher preparation cost, become the Main Bottleneck of restriction gasification, affected the competitive power of Coal Chemical Industry, therefore the gasification of High Temperature High Pressure may not be optimized gasification mode.
Utility model content
The utility model is intended to solve at least to a certain extent one of technical problem in correlation technique.For this reason, an object of the present utility model is to propose the system that a kind of catalytic coal gasifaction is prepared shaft furnace use reducing gas.
According to an aspect of the present utility model, the utility model proposes a kind of catalytic coal gasifaction and prepare the system of reducing gas for shaft furnace, comprising:
Heat storage type pyrolysis stove, described heat storage type pyrolysis stove and accessory has the import of fine coal granules of catalyst, water vapor import and thick reducing gas outlet, described heat storage type pyrolysis stove is suitable for fine coal, water vapor catalytic gasification reaction occurs under the effect of catalyzer, to generate the thick reducing gas that contains hydrogen, carbon monoxide, carbonic acid gas and hydrogen sulfide;
Waste heat boiler, described waste heat boiler has thermal reduction gas import, the outlet of cold reducing gas and vapour outlet, described thermal reduction gas import is connected with described thick reducing gas outlet, and described waste heat boiler is suitable for described thick reducing gas to carry out waste heat recovery, to produce water vapour;
Purifying plant, described purifying plant has cold reducing gas import and the outlet of refining reducing gas, and described cold reducing gas import is connected with the described cold reducing gas outlet of described waste heat boiler.Described purifying plant is suitable for the thick reducing gas through described waste heat recovery to carry out purification processes, to obtain refining reducing gas.
Thus, it is simple by the system architecture of reducing gas that the catalytic coal gasifaction of the utility model above-described embodiment is prepared shaft furnace, preparation reducing gas is efficient, energy consumption is low, utilize it to prepare not only environmental protection but also can reduce costs of reducing gas, the reducing gas preparing can be used for producing sponge iron, and whole technique says that environmental protection and energy saving are feasible technically, is a kind of system of efficiently utilizing coal reducing gas processed.
In addition, according to the catalytic coal gasifaction of the utility model above-described embodiment, prepare shaft furnace and can also there is following additional technical characterictic by the system of reducing gas:
In embodiment more of the present utility model, the described vapour outlet of described waste heat boiler is connected with the described water vapor import of described heat storage type pyrolysis stove, to described water vapour is reacted for described catalytic gasification.Can further save energy consumption thus.
In embodiment more of the present utility model, described purifying plant comprises the washing plant that is suitable for the thick reducing gas of the described waste heat recovery of described process to carry out carrying out washing treatment, desulfurization processing, processed compressed and carbonization treatment being connected successively, sweetener, gas booster compressor and decarbonation appliance, wherein, described washing plant is connected with described waste heat boiler.
Therefore, deficiency for existing Coal Gasification Technology technique, the catalytic gasification technology of the utility model employing coal replaces existing Coal Gasification Technology and prepares the required reducing gas of gas-based shaft kiln, in the situation that adding catalyzer, pulverized coal particle can rapid generating gasification react under 650～800 degrees Celsius, H in the crude synthesis gas of generation 2the ratio of/CO, between 3.5～1.5:1, meets the requirement of gas-based shaft kiln reducing gas, and does not need to convert; The interpolation of catalyzer has reduced temperature, energy consumption and the requirement to equipment material etc. of gasification, and all highly beneficial to desulfurization, dedusting and environmental protection etc., composition of coal gas in product is had to better selectivity, in addition, owing to not needing oxygen in process, nonnitrogenous gas in synthetic gas, has improved industrial economy.
Accompanying drawing explanation
Fig. 1 prepares the structural representation of the system of reducing gas for shaft furnace according to the catalytic coal gasifaction of an embodiment of utility model.
Fig. 2 prepares the structural representation of the system of reducing gas for shaft furnace according to the catalytic coal gasifaction of another embodiment of utility model.
Fig. 3 utilizes the catalytic coal gasifaction of an embodiment of utility model to prepare shaft furnace by the system of reducing gas, to prepare the schema of the method for reducing gas.
Fig. 4 utilizes the catalytic coal gasifaction of another embodiment of utility model to prepare shaft furnace by the system of reducing gas, to prepare the schema of the method for reducing gas.
Fig. 5 prepares the structural representation of the system of reducing gas for shaft furnace according to the catalytic coal gasifaction of another embodiment of invention.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Below with reference to Fig. 1-2, describe the catalytic coal gasifaction of the utility model embodiment and prepare the system of reducing gas for shaft furnace.
According to the catalytic coal gasifaction of the utility model embodiment, preparing shaft furnace comprises by the system 100 of reducing gas: heat storage type pyrolysis stove 10, waste heat boiler 20 and purifying plant 30.
Wherein, heat storage type pyrolysis 10 stove and accessorys have fine coal granules of catalyst import 11, water vapor import 12 and thick reducing gas outlet 13, heat storage type pyrolysis stove is suitable for fine coal, water vapor catalytic gasification reaction occurs under the effect of catalyzer, to generate the thick reducing gas that contains hydrogen, carbon monoxide, carbonic acid gas and hydrogen sulfide;
Waste heat boiler 20 has thermal reduction gas import 21, the outlet 22 of cold reducing gas and vapour outlet 23, and thermal reduction gas import is connected with described thick reducing gas outlet, and waste heat boiler is suitable for thick reducing gas to carry out waste heat recovery, to produce water vapour;
Purifying plant 30 has cold reducing gas import 301 and refining reducing gas outlet 302, cold reducing gas import 301 is connected with the described cold reducing gas outlet 22 of waste heat boiler, purifying plant 30 is suitable for the thick reducing gas through waste heat recovery to carry out purification processes, to obtain refining reducing gas.
As shown in Figure 2, according to specific embodiment of the utility model, the vapour outlet 23 of waste heat boiler is connected with the described water vapor import 12 of heat storage type pyrolysis stove, to water vapour is reacted for catalytic gasification.Can save the energy consumption of preparing water vapour thus.
According to specific embodiment of the utility model, purifying plant further comprises being suitable for carry out the washing plant 31 of carrying out washing treatment, desulfurization processing, processed compressed and carbonization treatment through the thick reducing gas of waste heat recovery of being connected successively, sweetener 32, gas booster compressor 33 and decarbonation appliance 34.Can purify and then obtain refining reducing gas thick reducing gas thus.According to specific embodiment of the utility model, by adopting total content that above-mentioned catalytic coal gasifaction prepares hydrogen and carbon monoxide in the refining reducing gas that shaft furnace prepares by the system of reducing gas for being not less than 88 volume %, the volume ratio of hydrogen and carbon monoxide is (3.5～1.5): 1.Therefore this refining reducing gas can reach the requirement that gas-based shaft kiln is prepared sponge iron.According to specific embodiment of the utility model, the oxidisability of refining reducing gas is less than 5%, the about 1.0MPa of pressure (G).And then utilize this refining reducing gas ironmaking, and can further improve degree of metalization, productivity and capacity usage ratio, improve the purity of iron and reduce energy consumption.
Below with reference to Fig. 3-4 description, utilize the catalytic coal gasifaction of the utility model above-described embodiment to prepare shaft furnace and by the system of reducing gas, prepare the method for reducing gas.
The method specifically comprises the following steps:
S100: catalytic gasification reaction
By carrying out pressure ball processing after fine coal and catalyst mix, to obtain pulverized coal particle;
From the fine coal granules of catalyst import 11 of heat storage type pyrolysis stove 10, add pulverized coal particle, from water vapor import 12, pass into water vapour, and pulverized coal particle is reacted with water vapour generation catalytic gasification, to generate the thick reducing gas that contains hydrogen, carbon monoxide, carbonic acid gas and hydrogen sulfide, from thick reducing gas outlet 13, discharge.
Thus, utilize water vapor as vaporized chemical and utilized catalyzer to carry out catalytic coal gasifaction, can reduce gasification reaction temperature, do not need to maintain with air combustion part coal the temperature of vapourizing furnace, can avoid like this bringing nitrogen into by air, nonnitrogenous gas in synthetic gas, avoid follow-up nitrogen separation problem, improve FU and mentioned the suitability of processing power and coal, energy efficient expense, avoid bringing by air the calorific loss that nitrogen can reduce system into simultaneously, reduced facility investment and production cost.The low-temperature catalysis gasification of coal makes pulverized coal particle and water vapour under the effect of catalyzer, at lower temperature, can carry out gasification reaction, reduced temperature, energy consumption and the requirement to equipment material etc. of gasification, and all highly beneficial to desulfurization, dedusting and environmental protection etc.
Adopt the fine coal after pressure ball to prepare the pneumatic conveyer that reducing gas can be economized configure fine coal, and then simplify technique and reduce equipment cost.According to specific embodiment of the utility model, the particle diameter that pressure ball is processed the pulverized coal particle obtaining can be 10～50mm.By pressure ball, process the contact area that can increase fine coal and catalyzer thus, and then can significantly improve the transformation efficiency of carbon, it is that 10～50mm pulverized coal particle not only can save use pneumatic conveyer conveying fine coal that while pressure ball obtains particle diameter, improves water vapour simultaneously and is more prone to and pulverized coal particle contact area.Although the particle diameter of fine coal is less, while contacting with water vapour, water vapour is difficult to reach with all fine coal and contacts, so gasification efficiency is not high.Yet fine coal and catalyzer are pressed into pelletizing and then water vapour in advance, contact and can increase on the contrary water vapour and pelletizing touch opportunity, and then can significantly improve gasification efficiency.
According to specific embodiment of the utility model, the mass ratio of fine coal, catalyzer and water vapour is: (1～4): (0.01～0.08): 1, can further improve gasification efficiency, energy efficient thus, and the H of the reducing gas preparing by employing said ratio 2/ CO 2can reach the requirement of the reducing gas that gas-based shaft kiln sponge iron smelting uses.Therefore, fine coal, water vapour and catalyzer are carried out to catalytic gasification reaction according to above-mentioned quality proportioning, can further improve gasification reaction efficiency, improve the productive rate of reducing gas.
According to specific embodiment of the utility model, the interpolation of catalyzer can make the gasification at low temperatures of fine coal, the methane that coal gasification generates simultaneously divides further to react with water vapour under the effect of catalyzer produces carbon monoxide and hydrogen, the coal tar that pulverized coal pyrolysis generates also carries out secondary decomposition under the effect of catalyzer, has produced more reducing gas.The conversion of methane and the decomposition of the secondary of coal tar are carried out in same reactor, greatly improve the efficiency of process, the gases such as all right absorption portion hydrogen sulfide of while catalyzer and carbonic acid gas, be conducive to the low temperature gasification of coal and the desulfurization of postorder, dedusting and environmental protection, and the composition of reducing gas is had to better selectivity.
According to specific embodiment of the utility model, catalyzer is at least one oxide compound or the salt that is selected from basic metal, transition metal, alkaline-earth metal, and wherein, basic metal is to be selected from least one of lithium, sodium, potassium, rubidium and cerium; Transition metal is at least one of vanadium, chromium, manganese, iron, cobalt, nickel, copper and molybdenum; Alkaline-earth metal is at least one of magnesium, calcium and barium; The type of salt is at least one of carbonate, vitriol, hydrocarbonate, formate, oxalate, aminocompound, oxyhydroxide, acetate.Thus, adding of catalyzer can further improve gasification reaction efficiency, reduce temperature, energy consumption and the requirement to equipment material etc. of coal gasification, can also absorb the gases such as the partial vulcanization hydrogen that slightly also becomes in gas and carbonic acid gas, be conducive to desulfurization, dedusting and the environmental protection of operation below.And adding of catalyzer has better selectivity to the composition of thick reducing gas.
According to another embodiment of the present utility model, the oxide compound of the alkaline-earth metal that contains 0.1～3.0 % by weight in above-mentioned catalyzer and/or the salt of alkaline-earth metal.Can significantly improve catalytic efficiency thus, for example, adopt the catalyzer with said components efficiency of carbon conversion can be brought up to 90% from 54%, the content of hydrogen and carbon monoxide is increased to 89% from 44%.According to specific embodiment of the utility model, above-mentioned alkaline-earth metal is specifically as follows at least one of magnesium, calcium and barium.Can significantly improve the catalytic efficiency of catalyzer thus, improve the content of efficiency of carbon conversion and reducing gas.
According to another specific embodiment of the present utility model, the condition of the catalytic gasification reaction of above-mentioned carrying out in heat storage type pyrolysis stove is also not particularly limited, according to concrete example of the present utility model, the reaction of above-mentioned catalytic gasification can be to carry out under the pressure of 650～800 degrees Celsius and 22KPa.
Need to carrying out under the pressure of 1200～1500 degrees Celsius and 2～6MPa of traditional coal gasification reaction, even if used catalyzer, the pressure of its gasification reaction also will be controlled at 3～4MPa.Therefore catalytic coal gasifaction of the present utility model is prepared shaft furnace and is reacted and significantly saved energy consumption with the more existing coal gasification of system of reducing gas.According to specific embodiment of the utility model, by utilizing the reducing gas that said system prepares can reach the requirement that gas-based shaft kiln is prepared sponge iron.
S200: waste heat recovery
According to specific embodiment of the utility model, the thick reducing gas of discharging from thick reducing gas outlet enters waste heat boiler 20, and the thick reducing gas obtaining is carried out to waste heat recovery, to produce water vapour.When can reclaim heat thus, thick reducing gas is lowered the temperature.
According to another specific embodiment of the present utility model, the water vapor producing can be returned in heat storage type pyrolysis stove and reacts for catalytic gasification from water vapor import in waste heat boiler.Can save the energy consumption of preparing water vapour thus.
S300: purification processes
According to specific embodiment of the utility model, will carry out purification processes through the thick reducing gas of waste heat boiler 20 waste heat recoveries further, to obtain refining reducing gas.Can improve the purity of reducing gas thus, and obtain having suitable H 2/ CO 2the refining reducing gas of proportioning.
According to specific embodiment of the utility model, as shown in Figure 4, purification processes may further include:
S310: carrying out washing treatment
According to specific embodiment of the utility model, first utilize the thick reducing gas of 31 pairs of processes of washing plant waste heat recovery to carry out carrying out washing treatment, to remove catalyzer residual in thick reducing gas and thin ash.
According to concrete example of the present utility model, carrying out washing treatment can specifically be carried out according to the following step, thick reducing gas is mixed through Venturi tube with the water from Quench water pump, thin ash is soaked completely by water, then through washing tower downtake, enter wash tower bottoms water-bath, remove remaining thin ash, then the annular space through between downtake and airway rises, enter the column plate at washing tower top, by the scum dredger above column plate, the water droplet of carrying secretly is separated.The thick reducing gas that does not basically contain thin ash goes out washing tower and delivers to thionizer.The acid solution of discharging at the bottom of washing tower enters catalyst recovery equipment, reclaims catalyzer.
S320: desulfurization is processed
According to concrete example of the present utility model, utilize the thick reducing gas of 32 pairs of process carrying out washing treatment of sweetener to carry out desulfurization processing, to remove hydrogen sulfide.
According to specific embodiment of the utility model, desulfurization is processed and can be adopted N methyldiethanol amine to carry out.Can further improve sweetening effectiveness thus, specifically the H in reducing gas slightly 2s is from 4g/m 3take off 2mg/m 3.And adopt N methyldiethanol amine can also remove the CO of a great deal of when removing hydrogen sulfide 2, can further improve thus the total content of hydrogen and carbon monoxide in reducing gas, improve reducing gas reducing property.Therefore, adopt the catalytic coal gasifaction of the utility model above-described embodiment to prepare shaft furnace and by the system of reducing gas, prepare reducing gas and can be directly used in gas-based shaft kiln smelting sponge iron, and can significantly improve quality and the efficiency of sponge iron.
According to concrete example of the present utility model, desulfurization is processed and can specifically according to the following step, be carried out, thick reducing gas enters thionizer bottom after carrying out washing treatment dedusting is cooling, absorbs most H with top-down MDEA solution ((N methyldiethanol amine)) counter current contact in tower 2s and part SO 2and COS.The reducing gas that goes out thionizer enters tower top water cooler and is cooled to 40 ℃ of left and right, enters gas-liquid separator and carries out gas-liquid separation, reclaims MDEA absorption liquid (N methyldiethanol amine), and the reducing gas of about 22kPa (G) is delivered to compressor 1.The rich solution of discharging at the bottom of thionizer, enters flash tank flash distillation through rich solution pump, enters CO together with the overhead gas of the flash steam of flash drum overhead and the flash steam of decarbonization section and solution regenerator after condensation 2separator and desulfurizer.Sulphur in desulfurizer after treatment, is produced sulphur and is sold outward, the lean solution at the bottom of regenerator column tower after regeneration through solution heat exchanger and solution cooler heat exchange and cooling after return to thionizer and decarbonizing tower recycles.
S330: processed compressed
According to specific embodiment of the utility model, utilize 33 pairs of thick reducing gas of processing through desulfurization of gas booster compressor to carry out processed compressed.According to concrete example of the present utility model, can utilize compressor that reducing gas is compressed to 1MPa (G) left and right, then draw into decarbonizing tower.
S340: carbonization treatment
Utilize the thick reducing gas of 34 pairs of process processed compressed of decarbonation appliance to carry out carbonization treatment, to remove carbonic acid gas, obtain described refining reducing gas.
According to specific embodiment of the utility model, carbonization treatment can adopt N methyldiethanol amine to carry out.
According to concrete example of the present utility model, desulfurization is processed and can specifically according to the following step, be carried out, and makes to enter air inlet oil eliminator from the reducing gas of compressor laggard decarbonizing tower, reducing gas bottom in and top out, absorption liquid MDEA upper entering and lower leaving, counter current contact.Gas after decarburization by tower top out, enters tower top water cooler, will be cooled to 40 ℃ because of the reducing gas absorb heating up, and by the fine decarbonization tower liquid/gas separator of working off one's feeling vent one's spleen, carries out gas-liquid separation, reclaims MDEA absorption liquid.Two gangs of MDEA (N methyldiethanol amine) solution of the thionizer of processing from desulfurization and the decarbonizing tower of carbonization treatment enters flash tank after mixing.Together with the overhead gas of flash drum overhead flash steam out and regenerator column, after condensation, enter CO 2separator and desulfurizer, the sulphur in desulfurizer after treatment, is produced sulphur and is sold outward; Lean solution at the bottom of regenerator column tower after regeneration is through solution heat exchanger and solution cooler heat exchange returns to above-mentioned thionizer after cooling and decarbonizing tower recycles.
According to specific embodiment of the utility model, in the refining reducing gas preparing by employing said system, the total content of hydrogen and carbon monoxide is for being not less than 88 volume %, and the volume ratio of hydrogen and carbon monoxide is (3.5～1.5): 1.Therefore this refining reducing gas can reach gas-based shaft kiln and prepares the requirement of sponge iron to reducing gas.According to specific embodiment of the utility model, the oxidisability of the refining reducing gas preparing by said system is less than 5%, the about 1.0MPa of pressure (G).And then utilize this refining reducing gas ironmaking, and can further improve degree of metalization, productivity and capacity usage ratio, improve the purity of iron and reduce energy consumption.
Embodiment 1
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.06 evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-14.5%FeCl 3-1.5%Ca (Ac) 2; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 2.5kg:1kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 94%, and in product, the content of hydrogen and carbon monoxide is 92%, and the ratio of hydrogen and carbon monoxide is 3.8:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 93%.
Embodiment 2
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.06 evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-14.5%FeCl 3-1.5%BaCl 2; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 2.5kg:1kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 92%, and in product, the content of hydrogen and carbon monoxide is 90%, and the ratio of hydrogen and carbon monoxide is 3.6:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 91%.
Embodiment 3
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.06 evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-15%FeCl 3; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 2.5kg:1kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 87%, and in product, the content of hydrogen and carbon monoxide is 86%, and the ratio of hydrogen and carbon monoxide is 2.7:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 88%.
Embodiment 4
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.08 evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-14.5%FeCl 3-1.5%Ca (Ac) 2; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 2.5kg:1kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 93%, and in product, the content of hydrogen and carbon monoxide is 91%, and the ratio of hydrogen and carbon monoxide is 3.4:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 92%.
Embodiment 5
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.06 evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-14.5%FeCl 3-1.5%Ca (Ac) 2; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 2.5Kg:1.5kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 93%, and in product, the content of hydrogen and carbon monoxide is 92%, and the ratio of hydrogen and carbon monoxide is 3.9:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 92%.
Comparative example 1
With reference to figure 5, fine coal is carried out to pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction (not using catalyzer), make pulverized coal particle and water vapour according to the proportioning of 2.5kg:1kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 73%, and in product, the content of hydrogen and carbon monoxide is 75%, and the ratio of hydrogen and carbon monoxide is 2.1:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 78%.
Comparative example 2
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.01 (a small amount of catalyzer) evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-14.5%FeCl 3-1.5%Ca (Ac) 2; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 2.5kg:1kg in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 80%, and in product, the content of hydrogen and carbon monoxide is 79%, and the ratio of hydrogen and carbon monoxide is 2.5:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 82%.
Comparative example 3
With reference to figure 5, utilizing catalytic coal gasifaction to prepare shaft furnace produces and produces the required reducing gas technique of sponge iron by the system of reducing gas, its step is as follows: by fine coal and catalyzer, according to mass ratio, be that 2.5:0.06 evenly mixes and carries out pressure ball processing, obtain the pulverized coal particle that diameter is 10～50mm, catalyzer adopts 84%K 2cO 3-14.5%FeCl 3-1.5%Ca (Ac) 2; Pulverized coal particle is added in heat storage type pyrolysis stove, and passes into water vapour and carry out catalytic gasification reaction, make pulverized coal particle and water vapour according to the proportioning of 1kg:1kg (in a large number) in heat storage type pyrolysis reaction in furnace.Control temperature of reaction and be under the condition that 650～800 ℃, pressure are about 22KPa reaction in heat storage type pyrolysis stove and generate thick reducing gas (CH 4, CO 2, CO, H 2with a small amount of H 2the gas mixture of S etc.).
The thick reducing gas of high temperature that goes out heat storage type pyrolysis stove enters washing tower after waste heat boiler recovery waste heat, and the sour water of wash tower bottoms enters catalyst recovery equipment, reclaims catalyzer; Reducing gas (approximately 40 ℃ of temperature, pressure are 22KPa (G)) after the washing of washing tower top enters thionizer bottom and absorbs most H with interior top-down MDEA (N methyldiethanol amine) the solution counter current contact of tower 2s gas.Go out reducing gas (the about 0.02MPa of pressure (G), the H of thionizer 2s content is less than 5ppm) enter tower top water cooler, the reducing gas heating up because of absorption is cooled to 40 ℃ of left and right and carries out gas-liquid separation, reclaim MDEA absorption liquid, reducing gas, after cooling and gas-liquid separation, is sent into compressor pressure-raising.After compressor pressure-raising, (the about 1.0MPa of reducing gas pressure (G), 40 ℃ of left and right of temperature) enters decarbonizing tower and carries out carbon dioxide removal and obtain refining reducing gas.
By the composition in gas chromatographic analysis gaseous product, efficiency of carbon conversion is 95%, and in product, the content of hydrogen and carbon monoxide is 91%, and the ratio of hydrogen and carbon monoxide is 4.3:1.Above-mentioned refining reducing gas is entered to diamond heating after cooling and gas-liquid separation and be warming up to approximately 900 ℃, then enter in shaft furnace and smelt iron, degree of metalization is 90%.
In the utility model, unless otherwise clearly defined and limited, the terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or be integral; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, to the schematic statement of above-mentioned term not must for be identical embodiment or example.And, the specific features of description, structure, material or feature can one or more embodiment in office or example in suitable mode combination.In addition,, not conflicting in the situation that, those skilled in the art can carry out combination and combination by the feature of the different embodiment that describe in this specification sheets or example and different embodiment or example.
Although illustrated and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment in scope of the present utility model, modification, replacement and modification.

Claims (3)

1. catalytic coal gasifaction is prepared a system for reducing gas for shaft furnace, it is characterized in that, comprising:
Heat storage type pyrolysis stove, described heat storage type pyrolysis stove and accessory has the import of fine coal granules of catalyst, water vapor import and thick reducing gas outlet, described heat storage type pyrolysis stove is suitable for fine coal, water vapor catalytic gasification reaction occurs under the effect of catalyzer, to generate the thick reducing gas that contains hydrogen, carbon monoxide, carbonic acid gas and hydrogen sulfide;
Waste heat boiler, described waste heat boiler has thermal reduction gas import, the outlet of cold reducing gas and vapour outlet, and described thermal reduction gas import is connected with described thick reducing gas outlet;
Purifying plant, described purifying plant has cold reducing gas import and the outlet of refining reducing gas, and described cold reducing gas import is connected with the described cold reducing gas outlet of described waste heat boiler.
2. system according to claim 1, is characterized in that, the described vapour outlet of described waste heat boiler is connected with the described water vapor import of described heat storage type pyrolysis stove.
3. system according to claim 1, is characterized in that, described purifying plant further comprises connected successively washing plant, sweetener, and gas booster compressor and decarbonation appliance, wherein, described washing plant is connected with described waste heat boiler.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103952184A (en) * 2014-05-14 2014-07-30 北京神雾环境能源科技集团股份有限公司 Method and system for preparing reducing gas used for shaft furnace through catalytic coal gasification
CN104633650A (en) * 2015-02-09 2015-05-20 银川多贝科技有限公司 Non-emission circulating combustion carbon dioxide denaturation device of coal-fired furnace
CN106191362A (en) * 2016-09-13 2016-12-07 江苏省冶金设计院有限公司 The nozzle-type reducing gases of a kind of gas-based shaft kiln enters furnace apparatus and method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103952184A (en) * 2014-05-14 2014-07-30 北京神雾环境能源科技集团股份有限公司 Method and system for preparing reducing gas used for shaft furnace through catalytic coal gasification
CN104633650A (en) * 2015-02-09 2015-05-20 银川多贝科技有限公司 Non-emission circulating combustion carbon dioxide denaturation device of coal-fired furnace
CN106191362A (en) * 2016-09-13 2016-12-07 江苏省冶金设计院有限公司 The nozzle-type reducing gases of a kind of gas-based shaft kiln enters furnace apparatus and method thereof

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