CN103276131A - Comprehensive utilization process method of waste heat, residual pressure and residual gas of high-temperature raw gas - Google Patents
Comprehensive utilization process method of waste heat, residual pressure and residual gas of high-temperature raw gas Download PDFInfo
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Abstract
The invention discloses a comprehensive utilization process method of waste heat, residual pressure and residual gas of high-temperature raw gas. The comprehensive utilization process method is a poly-generation process comprising the following steps of: generating the high-temperature raw gas by a coal gas furnace, wherein the outlet pressure of the raw gas is less than or equal to 5MPa, the temperature of the raw gas is 830-1150 DEG C, and the oxidizability of the raw gas is below 17%; conveying the high-temperature raw gas, subjected to high-temperature dust extraction, into a reduction shaft filled with iron ore briquettes; dedusting the gas by an iron core briquette moving particle bed when the gas passes through layers of the bed, and heating the iron core briquettes to generate direct reduction iron; recycling waste heat from stock gas, and removing dust, tar and foreign gas from the stock gas to obtain reducing gas; performing SPA pressure swing adsorption on the reducing gas to separate out H2 and CO, adding partial reducing gas into the H2 to regulate the hydrogen-carbon ratio to 2:1 to 2:2, and producing methanol when the pressure of the reducing gas increases to be not lower than 5MPa; and carrying out fuel gas and steam combined cycle power generation by the reducing gas of which the H2 and the CO are separated out, and purge gas for producing the methanol when the pressure of the two gas increases to be not lower than 1.3MPa, thereby producing direct reduction iron, chemical engineering products and electric products.
Description
Technical field
The present invention relates to a kind of high temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method, specifically relate to a kind of high temperature rough gas waste heat overbottom pressure ironmaking that utilizes, the processing method of ironmaking residual air overbottom pressure production chemical product and power product belongs to a kind of Coal (syngas) polygeneration processing method.
Background technology
201010124542.1 patent of invention discloses the method for utilizing sensible heat of raw gas to produce direct-reduced iron, this method is that the high temperature sensible heat of raw gas that utilizes gas maked coal to produce is smelted direct-reduced iron, is waste heat ironmaking.
201110112050.5 patent of invention discloses the method for coke-oven gas coke dry quenching co-production direct-reduced iron, is to replace N with coke-oven gas
2As red Jiao's of cooling heat-transfer medium, utilize red burnt heating coke-oven gas, the coke-oven gas after the recycling heating its essence is and utilizes red parch quenching waste heat to smelt direct-reduced iron for the production of direct-reduced iron, remains waste heat ironmaking.
Also do not retrieve at present the Poly-generation continuous processing flow process of utilizing the ironmaking of waste heat overbottom pressure, ironmaking residual air overbottom pressure production chemical product coproduction electric power.
Summary of the invention
The purpose of this invention is to provide a kind of high temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method, to realize producing the multi-production process of direct-reduced iron, Chemicals, power product.
High temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method of the present invention is that the high temperature rough gas that the gas maked coal stove produces is transported in the reduction shaft furnace that is filled with iron ore briquet or ferric oxide pellet, utilize high temperature rough gas waste heat overbottom pressure to produce direct-reduced iron, it is that 2 ﹕, 1～2 ﹕ 2 is for the production of methyl alcohol that the direct-reduced iron stock gas is adjusted hydrogen-carbon ratio, producing behind the methyl alcohol with CO is that the venting of speeding of main gas is used further to the combustion and steam combined cycle generation, to realize producing the multi-production process of direct-reduced iron, Chemicals, power product.
High temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method of the present invention specifically may further comprise the steps:
A. the coal of selecting the coal ash softening temperature to be higher than at least 50 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in the gas maked coal stove; Raw gas top hole pressure≤5MPa, 830 ℃～1150 ℃ of temperature, oxidisability≤17%; Utilize raw gas to carry pressure, with tornado dust collector or baffle plate dedusting;
B. with the iron ore briquet for containing the iron ore raw material, be seated in the reduction shaft furnace; 830 ℃～1150 ℃ high temperature rough gas behind the high-temperature dust removal are transported in the reduction shaft furnace that is filled with the iron ore briquet via the bustle pipe that is located at the reduction shaft furnace middle part, from iron ore briquet moving granular bed layer, pass, through the dedusting of iron ore briquet moving granular bed, and heating iron ore briquet is produced direct-reduced iron; Or be raw material with the iron oxide pellet nodulizing, be seated in the reduction shaft furnace; 830 ℃～950 ℃ high temperature rough gas behind the high-temperature dust removal are transported in the reduction shaft furnace that is filled with the iron oxide pellet nodulizing via the bustle pipe that is located at the reduction shaft furnace middle part, from iron oxide pellet nodulizing moving granular bed layer, pass, through the dedusting of iron oxide pellet nodulizing moving granular bed, and heated oxide iron ball nodulizing is produced direct-reduced iron;
C. direct-reduced iron is discharged by discharge port behind the lock hopper exhaust decompression down through reduction shaft furnace bottom, through airtight heat screening, is used for electric furnace, converter steelmaking after screening out dust, or is used for the refrigerant of steel-making continuous casting;
D. stock gas cools to 350 ℃～800 ℃ and discharges reduction shaft furnaces, through the interchanger recovery waste heat, after electrically trapped tar oil is down to normal temperature, through electricity bag composite dedusting, enters low-temperature rectisol or ammonia process of desulfurization decarbonization process, becomes reducing gas after removing foreign gas;
E. reducing gas goes out wherein H through SPA transformation fractionation by adsorption
2And CO, again to H
2In be blended into the reducing gas that a part has pressure, hydrogen-carbon ratio is adjusted to 2 ﹕, 1～2 ﹕ 2, reducing gas is pressurized to and is not less than 5MPa for the production of methyl alcohol; Or through PSA transformation absorption cutting out partial CO from reducing gas, the reducing gas hydrogen-carbon ratio is adjusted to 2 ﹕, 1～2 ﹕ 2, be pressurized to and be not less than 5MPa for the production of methyl alcohol;
F. go out H through SPA transformation fractionation by adsorption
2With reducing gas behind the CO with produce the venting of speeding behind the methyl alcohol be pressurized to be not less than 1.3MPa after, be used for the combustion and steam combined cycle generation.
Wherein, described reducing gas also can be for the production of such as other Chemicals such as indirect liquefaction gasoline, ethanol, synthetic natural gases.
It is generally acknowledged that gasification of coal-waste heat ironmaking-Chemicals-residual air generating is can not quantity-produced.
Yet the present invention discovers, adopt pressure≤5MPa the gas maked coal stove and≤reduction shaft furnace of 5MPa gaseous tension, can under the situation of step-down 0.05～0.2MPa, make the direct-reduced iron stock gas remain on 3.8～3.9MPa; The top gas afterheat heat exchanger utilizes 〉=350 ℃ of waste heats, drops under normal temperature, the top gas step-down 0.05～0.2MPa at gas, still can keep-up pressure at 3.7～3.8MPa; Gas after the heat exchange of top gas waste heat, under step-down 0.05～0.2MPa situation, coal gas still can keep the pressure of 3.6～3.7MPa through electrically trapped tar oil and bag-type dust; Can satisfy low-temperature rectisol and remove CO
2, H
2The pressure of foreign gas such as S, COS requires 2.5～5.5MPa, and the reducing gas after the low-temperature rectisol still can keep-up pressure between 3.3～3.5MPa; Coal gas is through PSA transformation fractionation by adsorption H
2And CO, step-down is 0.05～0.1MPa only, and reducing gas still can keep-up pressure at 〉=3.25MPa; After the hydrogen-carbon ratio of reducing gas being adjusted to 2 ﹕, 1～2 ﹕ 2, compressed machine is pressurized to 〉=5.0MPa, just can be for the production of methyl alcohol again; Produce main gas CO, the N of exitting that speed of methyl alcohol
2The solution gassing CO, the N that come out with PSA transformation fractionation by adsorption
2, separate only 0.02MPa of gassing, with other inflammable gas, air through stage pump be forced into 〉=1.3MPa can be used for the combustion and steam combined cycle generation.
The reason that processing method of the present invention can realize also is the following aspects.
1, owing in iron ore coal briquette nodulizing, be furnished with coal dust and make reductive agent, therefore, enters and in the direct-reduced iron process, be warming up to 900 ℃ of H in the previously generated dry distillation gas in the top gas
2Amount, the H in the raw gas that consumes with the reduced iron later stage
2Amount equates substantially, and what be equivalent to the utilization of reduced iron process is carbon in the coal, and protium is stayed for the production of methyl alcohol or other Chemicals.
2, produce speeding to exit and be not conventional H behind the methyl alcohol
2, but with CO, N
2Be the main venting of speeding, can be used for the combustion and steam combined cycle generation.
3, the raw gas pressure≤5MPa of direct-reduced iron reduction shaft furnace production employing, reduction shaft furnace arrange upper lock hopper and are used for packing into iron ore briquet, following lock hopper for after reducing gas being unloaded the gas decompression, and direct-reduced iron unloads and comes out of the stove.
4, the direct-reduced iron stock gas is 350 ℃～800 ℃, uses the interchanger recovery waste heat; The stock gas low-temperature rectisol removes CO
2, H
2S, COS and other foreign gas; PSA transformation fractionation by adsorption H
2And CO, to adjust hydrogen-carbon ratio in the reducing gas; The gaseous tension that utilizes coal gasifier to produce drives whole process gas, and adopts topping-up pump when gaseous tension does not reach processing requirement.Specifically be after the distribution hydrogen-carbon ratio reaches 2 ﹕, 1～2 ﹕ 2 before producing methyl alcohol, when reducing gas pressure does not reach 5.0MPa pressure, compressor to be set the reducing gas for preparing is boosted to 5.0MPa for the production of methyl alcohol; Before entering internal combustion turbine, speed venting and the isolated CO of PSA be pressurized to 〉=1.3MPa through stage pump.
The pressure and temp processing parameter is as shown in the table in the high temperature rough gas waste heat of the present invention overbottom pressure residual air comprehensive utilization process method.
Add up to step-down 1.15Mpa from the reducing gas of raw gas top hole pressure after DRI shaft furnace, interchanger, the dedusting of electricity bag, low-temperature rectisol, PSA separate, if DRI shaft furnace raw gas intake pressure 〉=4Mpa between 4Mpa～5Mpa, adds up to step-down 1.15Mpa.
A). reducing gas pressure≤5MPa that the direct-reduced iron reduction shaft furnace adopts, 830 ℃～1150 ℃ of temperature, the charging discharging of reduction shaft furnace must be adopted upper lock hopper charging and following lock hopper discharging.The pressure release gas of lock hopper can be used for Chemicals Production Flow Charts such as methyl alcohol through purifying supercharging up and down, also can be used for combined combustion and steam turbine power.
B). adopt 4MPa pressure, the raw gas reducing gas of 830 ℃～1150 ℃ of temperature, direct-reduced iron shaft furnace furnace roof gas outlet temperature can be down to 350 ℃～800 ℃, and pressure can remain on 3.8MPa～3.9MPa.
C). behind the waste heat boiler recovery waste heat, gas temperature can be down to normal temperature from the stock gas of the 3.8MPa～3.9MPa of direct-reduced iron shaft furnace output, 350 ℃～800 ℃ of temperature, and pressure drops to 3.7MPa～3.8MPa.
D). the stock gas behind the sharp recovery waste heat of used heat pot, enter electricity bag composite dedusting operation through electrically trapped tar oil, the temperature remains within the normal range after the dedusting, and pressure drops to 3.6MPa～3.7MPa.
E). the stock gas behind the electricity bag composite dedusting enters the low-temperature rectisol operation, is removing CO
2, H
2Become reducing gas after the foreign gas such as S, COS, the gaseous tension of this moment drops to 3.3MPa～3.5MPa, and the reducing gas composition is H
2Account for 20%～30%, CO and account for 70%～80%.Low-temperature rectisol operation step-down≤0.25MPa.
F). the reducing gas hydrogen-carbon ratio through the low-temperature rectisol output does not reach the requirement of producing methyl alcohol or products such as other Chemicals methane, indirect synthetic gasoline, needs to adjust.Adopt the PSA pressure swing adsorption process, with H
2Separate, and cooperate with the reducing gas of low-temperature rectisol output, adjust hydrogen-carbon ratio for the production of methyl alcohol or other Chemicals through distribution.The hydrogen-carbon ratio of producing methyl alcohol is 2 ﹕ 1, setting range 2 ﹕ 1～2 ﹕ 2, and consumption is H
21400m
3, CO 700m
3, add up to 2100m
3/ t. methyl alcohol.Because the many hydrogen of carbon are few in proportion in the flow process, the venting of speeding is main gas with CO.PSA operation step-down 0.05～0.1Mpa, the reducing gas temperature after the absorption of PSA transformation drops to normal temperature, and pressure drops to 〉=3.25Mpa.The absorption of PSA transformation can be adsorbed H
2With CO as reducing gas, also can CO absorption, with isolated H
2Do reducing gas with CO.
G). from reducing gas and the isolated H of PSA of low-temperature rectisol output
2With CO through the distribution operation, temperature reaches normal temperature, pressure drops to 2.9MPa～3.5MPa, again through the gas compressor supercharging, pressure is raised to 〉=5.0MPa, sends into the methanol production operation, temperature is brought up to 240 ℃～300 ℃, for the production of methyl alcohol.
H). the venting of speeding behind the production methyl alcohol is because hydrogen-carbon ratio carbon greater than hydrogen, mainly is CO so speed to exit, rather than the H of conventional methanol process
2Separate the CO of output and the methyl alcohol CO that speeds to exit by PSA and merge, compressed machine is pressurized to 〉=1.3MPa, is used for the gas-turbine gas turbine power generation.550～609 ℃ of turbine power generation exhaust temperatures are used for waste heat boiler cogeneration.
I). if will improve Chemicals output, reduce generated energy, can be with a part of reducing gas through H
2O conversion H
2, with this section H that increases
2Adjust the reducing gas hydrogen-carbon ratio, to increase Chemicals output, reduce generated energy.
The present invention contacts existing methyl alcohol or Chemicals, combustion and steam combined cycle generation technology by the waste heat iron-smelting process.Each operation waste heat overbottom pressure residual air is utilized as following table.
One of feature of the present invention, waste heat ironmaking energy consumption is low.Press normal pressure reduction test data computation, when furnace top gas temperature is designed to 350 ℃, the reductive agent coal consumption is 218kg, utilize waste heat to amount to heat energy 85cekg, add up to energy consumption 303kg/t.DRI, than the low 43kg/t.DRI of MIDREX direct-reduced iron technology 364kg/t.DRI, major cause is that reduction ratio of MIDREX reducing gas has only 30%, reducing gas will purify, heat and circulate 3 times repeatedly, the combustion parts top gas to add thermal reduction gas, and this part energy consumption has been cancelled in waste heat ironmaking.Waste heat ironmaking 303kg/t.DRI adds the molten power consumption 350kwh/t.Fe that divides of DRI hot charging electric furnace, and energy consumption is 346kg/t.Fe, and energy consumption 529kg/t.Fe is low than blast furnace ironmaking (containing coking, sintering, ironmaking).
Two of feature of the present invention, combined production of methanol is lower than coal methyl alcohol energy consumption processed.Because raw gas≤5.0MPa gaseous tension is adopted in waste heat ironmaking, useless pot afterwards, dedusting, low-temperature rectisol, each operation of PSA all will consume and reduce gaseous tension, but pressure still can reach 3.0MPa～3.6MPa before reducing gas enters production methyl alcohol operation.Compare with coal methyl alcohol single product processed national regulation energy consumption 1.684t, owing to utilized reducing gas pressure 3.0MPa～3.6MPa, can reduce significantly and drive the reducing gas energy consumption, economize on electricity 400～500 kwh/t. methyl alcohol, make Poly-generation methyl alcohol descend than coal methyl alcohol single product processed energy consumption, from coal methyl alcohol single product processed national regulation energy consumption 1.684t(coal methyl alcohol processed, methyl alcohol is the methyl alcohol coal consumption of alkene processed again), drop to Poly-generation methyl alcohol energy consumption 1.0t～1.3t.
Three of feature of the present invention, the combustion and steam combined cycle generation is lower than conventional coal fired power generation energy consumption.Adopt methyl alcohol speed to exit CO and PSA divided gas flow CO to merge, be used for the combustion and steam combined cycle generation.Tianjin, Huaneng Group IGCC power plant gross coal consumption rate is 255g/kwh, the whole nation coal-fired net coal consumption rate 330g/kwh in 2011, and combustion and steam combined cycle generation of the present invention is lower than the coal consumption of conventional coal-burning power plant, can reach 255g/kwh, and is lower than conventional coal fired power generation energy consumption.
Four of feature of the present invention, the Poly-generation energy consumption is lower than the single product energy consumption.Because adding the molten branch energy consumption of electric furnace, the ironmaking of Poly-generation waste heat is lower than the blast furnace ironmaking energy consumption; Poly-generation methyl alcohol energy consumption is lower than coal methyl alcohol single product processed energy consumption; Combustion and steam combined cycle generation energy consumption is lower than conventional coal fired power generation energy consumption; Make Poly-generation flow process energy consumption be lower than the single product energy consumption.
Five of feature of the present invention has reduced the waste gas that produces.Waste heat ironmaking has only increased 540m than gasification of coal
3Waste gas is than blast furnace ironmaking discharging blast furnace gas 1500m
3～1800m
3Few 960m
3～1260m
3And the 540m that waste heat ironmaking increases
3Waste gas has incorporated in the stock gas, greatly reduces the coal gas treatment capacity of the dedusting of coal gas of ironmaking and methanol production, desulfurization, decarburization, has increased sulfuration chemical product and CO
2Amount of collected has also been cancelled single coal for power generation qi exhaustion sulphur, dedusting operation simultaneously, has reduced CO
2Quantity discharged.
Six of feature of the present invention, methyl alcohol are speeded venting based on CO.Conventional methanol production is speeded venting with H
2Be main component, Poly-generation methyl alcohol is speeded venting with CO, N
2Be main component and the isolated CO of PSA, N
2Merge and be used for combined combustion and steam turbine power, owing to adopted the low-temperature rectisol gas purification process, make that the gas purification degree is higher, total sulfur content in the reducing gas≤0.1 * 10
6, total sulfur volume fraction≤10 * 10 in the tail gas
6, make combustion and steam combined cycle generation sulphur emissions reduce significantly, operation electricity bag meets dedusting before adding, has realized the cleaner production of generating operation.Can certainly adopt desulfurization, decarbonization process such as ammonia process, PSA.
Seven of feature of the present invention, Poly-generation can realize cleaner production.Because waste heat ironmaking, production methyl alcohol or other Chemicals, each product of combustion and steam combined cycle generation can be realized cleaner production, so the ironmaking of coal gas waste heat, chemical industry, electric power Poly-generation can realize cleaner production.
Eight of feature of the present invention, Poly-generation can reduce the unit product investment.Direct-reduced iron of the present invention, methyl alcohol or Chemicals, three products of generating use a gas maked coal source of the gas, use the environmental protection facility in the flow process jointly, have saved investment with the single product ratio.
Nine of feature of the present invention, Poly-generation have reduced the capture cost of greenhouse gases.The one, Poly-generation has reduced the waste gas that produces, and has reduced the capture cost of greenhouse gases; The 2nd, COS, H
2S, N
XCapture in the stock gas scavenging process of obnoxious flavoures such as O before producing methyl alcohol and reclaim; CO
2Capture in the stock gas scavenging process before producing methyl alcohol and reclaim a part; After the CO that separates with PSA of speeding to exit based on CO is used for the combined combustion and steam turbine power burning, the CO in the waste gas
2Can reach 20～30% higher concentration, and not have sulfide, dust, can PSA, the low-cost captures of method such as ammonia process, ion liquid solvent method reclaim CO
2
Ten of feature of the present invention, Poly-generation have reduced the environmental protection facility operation cost.Three products of direct-reduced iron of the present invention, methyl alcohol or Chemicals, generating use a gas maked coal source of the gas, use the environmental protection facility in the flow process jointly, with single product than the operation cost of having saved environmental protection facility.
Embodiment
Embodiment 1
Day is handled the two-part dried coal powder pressurized-gasification furnace of 1000t coal, uses bituminous coal to do coal for gasification, uses oxygen 608m
3/ t. coal, pulverized coal conveying gas are CO
2, raw gas reaches 1000～1100 ℃ from the coal gasifier tapping temperature, coal ash softening temperature＞1300 ℃, raw gas oxidisability≤15%, pressure 4MPa.Through first section baffle plate, ceramic tornado dust collector dedusting, input is equipped with in the shaft furnace of iron ore briquet for the production of direct-reduced iron.The iron ore briquet is closed the upper lock hopper lower valve in directly the reduction shaft furnace upper lock hopper is packed direct reduction shaft furnace into, upper lock hopper coal gas is unloaded the gas decompress(ion), reinstalls the next batch iron-bearing material, so repeatedly charging.Furnace top gas temperature behind the reduced iron is down to 〉=and 350 ℃, reclaim heat through interchanger, through electric fishing coal tar, stock gas is down to normal temperature and is removed H
2O.Stock gas through electricity bag composite dedusting, removes H through low-temperature rectisol again
2S, COS, CO
2Deng becoming reducing gas behind the toxic and harmful.With a part of reducing gas after PSA isolates CO, remaining H
2+ CO adds in the reducing gas, and the reducing gas hydrogen-carbon ratio is adjusted to 2 ﹕, 1 to 2 ﹕ 2, through gas compressor be pressurized to 〉=5.0MPa sends into the methanol production operation, temperature reaches 240 ℃～300 ℃ for the production of methyl alcohol.Producing the main component of exitting of speeding behind the methyl alcohol is CO, N
2, be blended into the isolated CO of PSA, N
2In, be used for the combustion and steam combined cycle generation.
Gas maked coal stove, direct-reduced iron shaft furnace, methanol device, the whole full productions of combustion and steam combined cycle generation, raw gas flow 82500m
3/ h utilizes waste heat can produce direct-reduced iron 30～43t/h; Effective airshed (CO+H
2) 71500Nm
3/ h, H in the available gas
2Content 20% utilizes H
2+ CO can produce methyl alcohol 10.1t/h at most; Speed venting and the isolated CO of PSA behind the methyl alcohol, effectively airshed (CO) 50050Nm are produced in utilization
3/ h is used for the combustion and steam combined cycle generation, and the CO low heat value is 12.783mj/m
3, 85624Kwh/h can generate electricity.
Embodiment 2
Day is handled the two-part dried coal powder pressurized-gasification furnace of 2000t coal, uses bituminous coal to do coal for gasification, uses oxygen 608m
3/ t. coal, pulverized coal conveying gas are CO
2, raw gas reaches 1000～1100 ℃ from the coal gasifier tapping temperature, coal ash softening temperature＞1200 ℃, raw gas oxidisability≤15%, pressure 3.0MPa.Through first section baffle plate, ceramic tornado dust collector dedusting, input is equipped with in the shaft furnace of iron ore briquet for the production of direct-reduced iron, and the furnace top gas temperature behind the reduced iron is down to 〉=and 350 ℃.Reclaim heat through interchanger, through electric fishing coal tar, stock gas is down to normal temperature and is removed H
2O.Stock gas through electricity bag composite dedusting, removes H through low-temperature rectisol again
2S, COS, CO
2Deng becoming reducing gas behind the toxic and harmful.With a part of reducing gas after PSA isolates CO, remaining H
2+ CO adds in the reducing gas, and the reducing gas hydrogen-carbon ratio is adjusted to 2 ﹕, 1 to 2 ﹕ 2, is pressurized to 〉=5MPa through gas compressor, sends into the methanol production operation, and temperature reaches 240 ℃～300 ℃ for the production of methyl alcohol.Producing the main component of exitting of speeding behind the methyl alcohol is CO, N
2, be blended among the isolated CO of PSA, be used for the combustion and steam combined cycle generation.
Gas maked coal stove, direct-reduced iron shaft furnace, methanol device, the whole full productions of combustion and steam combined cycle generation, raw gas flow 165000m
3/ h utilizes waste heat can produce direct-reduced iron 60～87t/h; Effective airshed (CO+H
2) 135000Nm
3/ h, H in the available gas
2Content 20% utilizes H
2+ CO can produce methyl alcohol 19.2t/h; Speed venting and the isolated CO available gas of the PSA 161667Nm behind the methyl alcohol produced in utilization
3/ h, main component is CO, N
2, being used for the combustion and steam combined cycle generation, the CO low heat value is 12.783mj/m
3, 161667Kwh/h can generate electricity.
Embodiment 3
Day is handled the two-part dried coal powder pressurized-gasification furnace of 1000t coal, uses bituminous coal to do coal for gasification, uses oxygen 608m
3/ t. coal, pulverized coal conveying gas are CO
2, raw gas reaches 830～950 ℃ from the coal gasifier tapping temperature, coal ash softening temperature＞1000 ℃, raw gas oxidisability≤15%, pressure 4MPa.Through first section baffle plate, ceramic tornado dust collector dedusting, it is mining in the shaft furnace of producing direct-reduced iron that ferric oxide pellet is equipped with in input, and the furnace top gas temperature behind the reduced iron is down to 150～400 ℃.Reclaim heat through interchanger, through electric fishing coal tar, stock gas is down to normal temperature and is removed H
2O.Stock gas through electricity bag composite dedusting, removes H through low-temperature rectisol again
2S, COS, CO
2Deng becoming reducing gas behind the toxic and harmful.A part of reducing gas is become H through the CO shift conversion step
2, merge with another part residue reducing gas, the reducing gas hydrogen-carbon ratio is adjusted to 2 ﹕, 1 to 2 ﹕ 2, through gas compressor be pressurized to 〉=5.0MPa sends into the methanol production operation, temperature reaches 240 ℃～300 ℃ for the production of methyl alcohol.Producing the main component of exitting of speeding behind the methyl alcohol is CO, N
2, be used for the combustion and steam combined cycle generation.
Embodiment 4
Day is handled the two-part dried coal powder pressurized-gasification furnace of 2000t coal, uses bituminous coal to do coal for gasification, uses oxygen 608m
3/ t. coal, pulverized coal conveying gas are CO
2, raw gas reaches 1000～1100 ℃ from the coal gasifier tapping temperature, coal ash softening temperature＞1200 ℃, raw gas oxidisability≤15%, pressure 3.0MPa.Through first section baffle plate, ceramic tornado dust collector dedusting, input is equipped with in the shaft furnace of iron ore briquet for the production of direct-reduced iron, and the furnace top gas temperature behind the reduced iron is down to 〉=and 350 ℃.Reclaim heat through interchanger, through electric fishing coal tar, stock gas is down to normal temperature and is removed H
2O.Stock gas through electricity bag composite dedusting, removes H through low-temperature rectisol again
2S, COS, CO
2Deng becoming reducing gas behind the toxic and harmful.A part of reducing gas is become H through the CO shift conversion step
2, merge with another part residue reducing gas, the reducing gas hydrogen-carbon ratio is adjusted to 2 ﹕, 1 to 2 ﹕ 2, be pressurized to 〉=5MPa through gas compressor, send into the methanol production operation, temperature reaches 240 ℃～300 ℃ for the production of methyl alcohol.Producing the main component of exitting of speeding behind the methyl alcohol is CO, N
2, be blended among the isolated CO of PSA, be used for the combustion and steam combined cycle generation.
Claims (3)
1. one kind high temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method, this processing method may further comprise the steps:
A. the coal of selecting the coal ash softening temperature to be higher than at least 50 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in the gas maked coal stove; Raw gas top hole pressure≤5MPa, 830 ℃～1150 ℃ of temperature, oxidisability is controlled below 17%; Utilize raw gas to carry pressure, with tornado dust collector or baffle plate dedusting;
B. with the iron ore briquet for containing the iron ore raw material, be seated in the direct reduction shaft furnace; 830 ℃～1150 ℃ high temperature rough gas behind the high-temperature dust removal are transported in the direct reduction shaft furnace that is filled with the iron ore briquet via the bustle pipe that is located at the reduction shaft furnace middle part, from iron ore briquet moving granular bed layer, pass, through the dedusting of iron ore briquet moving granular bed, and heating iron ore briquet is produced direct-reduced iron;
C. direct-reduced iron through reduction shaft furnace bottom down the lock hopper decompression back of losing heart discharged by discharge port, through airtight heat screening, be used for electric furnace, converter steelmaking after screening out dust, or for the refrigerant of steel-making continuous casting;
D. stock gas cools to 350 ℃～800 ℃ and discharges reduction shaft furnace, after the interchanger recovery waste heat is down to normal temperature, after electricity bag composite dedusting, electrically trapped tar oil remove micro-tar, enter low-temperature rectisol or ammonia process of desulfurization decarbonization process, become reducing gas after removing foreign gas;
E. reducing gas goes out wherein H through SPA transformation fractionation by adsorption
2And CO, again to H
2In be blended into the reducing gas that a part has pressure, hydrogen-carbon ratio is adjusted to 2 ﹕, 1～2 ﹕ 2, reducing gas is pressurized to and is not less than 5MPa for the production of methyl alcohol; Or through PSA transformation absorption cutting out partial CO from reducing gas, the reducing gas hydrogen-carbon ratio is adjusted to 2 ﹕, 1～2 ﹕ 2, be pressurized to and be not less than 5MPa for the production of methyl alcohol;
F. go out H through SPA transformation fractionation by adsorption
2With reducing gas behind the CO with produce the venting of speeding behind the methyl alcohol be pressurized to be not less than 1.3MPa after, be used for the combustion and steam combined cycle generation.
2. high temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method according to claim 1 is characterized in that the iron ore raw material that contains among the described step b is ferric oxide pellet.
3. high temperature rough gas waste heat overbottom pressure residual air comprehensive utilization process method according to claim 1 is characterized in that the reducing gas production indirect liquefaction gasoline, ethanol or the synthetic natural gas that obtain with described steps d.
Priority Applications (1)
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| CN105169857A (en) * | 2015-10-13 | 2015-12-23 | 马军 | Heat recovery device |
| CN106244756A (en) * | 2016-08-28 | 2016-12-21 | 苏亚杰 | Direct Reducing Iron Process method is smelted in coal gas two sections series connection |
| CN108486304A (en) * | 2018-04-23 | 2018-09-04 | 东北大学 | A kind of coal gasification heating gas is directly used in the device and method of gas-based shaft kiln production direct reduced iron |
| CN108485725A (en) * | 2018-04-23 | 2018-09-04 | 东北大学 | A kind of device and technique, the device and technique that prepare DRI of raw gas modification |
| CN114281121A (en) * | 2021-12-29 | 2022-04-05 | 新奥科技发展有限公司 | Recovery system of lock hopper gas |
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| CN105169857A (en) * | 2015-10-13 | 2015-12-23 | 马军 | Heat recovery device |
| CN106244756A (en) * | 2016-08-28 | 2016-12-21 | 苏亚杰 | Direct Reducing Iron Process method is smelted in coal gas two sections series connection |
| CN108486304A (en) * | 2018-04-23 | 2018-09-04 | 东北大学 | A kind of coal gasification heating gas is directly used in the device and method of gas-based shaft kiln production direct reduced iron |
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| CN114281121B (en) * | 2021-12-29 | 2024-01-30 | 新奥科技发展有限公司 | Recovery system of lock bucket gas |
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| CN103276131B (en) | 2015-02-04 |
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Address after: Unit No. 15 East Building 036000 Shanxi city of Shuozhou Province, Shuocheng District Yee Jiayuan residential Room 302 Patentee after: Su Yajie Address before: No. 1, No. 3, No. 4, No. 3, Taoyuan South Road, Taiyuan, Shanxi Province, No. 108 Patentee before: Su Yajie |
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