CN103818879A - Micro-negative pressure black liquid gasification method and system apparatus thereof - Google Patents
Micro-negative pressure black liquid gasification method and system apparatus thereof Download PDFInfo
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- CN103818879A CN103818879A CN201410061669.1A CN201410061669A CN103818879A CN 103818879 A CN103818879 A CN 103818879A CN 201410061669 A CN201410061669 A CN 201410061669A CN 103818879 A CN103818879 A CN 103818879A
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- 238000002309 gasification Methods 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 title abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 142
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 42
- 239000001301 oxygen Substances 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 239000002918 waste heat Substances 0.000 claims abstract description 36
- 239000007921 spray Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000003513 alkali Substances 0.000 claims description 42
- 230000004927 fusion Effects 0.000 claims description 41
- 238000005507 spraying Methods 0.000 claims description 32
- 239000003595 mist Substances 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 239000002737 fuel gas Substances 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000008016 vaporization Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 10
- 239000000428 dust Substances 0.000 description 10
- 239000000567 combustion gas Substances 0.000 description 9
- 238000007599 discharging Methods 0.000 description 9
- 239000000295 fuel oil Substances 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000004537 pulping Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- ZSOMPVKQDGLTOT-UHFFFAOYSA-J sodium green Chemical compound C[N+](C)(C)C.C[N+](C)(C)C.C[N+](C)(C)C.C[N+](C)(C)C.COC=1C=C(NC(=O)C=2C=C(C(=CC=2)C2=C3C=C(Cl)C(=O)C=C3OC3=CC([O-])=C(Cl)C=C32)C([O-])=O)C(OC)=CC=1N(CCOCC1)CCOCCOCCN1C(C(=C1)OC)=CC(OC)=C1NC(=O)C1=CC=C(C2=C3C=C(Cl)C(=O)C=C3OC3=CC([O-])=C(Cl)C=C32)C(C([O-])=O)=C1 ZSOMPVKQDGLTOT-UHFFFAOYSA-J 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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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
Abstract
The invention discloses a micro-negative pressure black liquid gasification method and a system apparatus thereof. The method comprises the following steps: gasifying a black liquid at a high temperature under a micro-negative pressure with the black liquid as a raw material, oxygen as a combustion improver, water vapor as a gasifying agent and a black liquid gasifying furnace as a reactor to generate a rough gasified gas, allowing the rough gasified gas to go through a waste heat boiler to recover heat, and carrying out spray cooling and spray desulphurization to obtain a purified gasified gas with H2 and CO as main components. The invention also discloses the system apparatus using the method. The system apparatus enables the black liquid gasification method to be carried out under the micro-negative pressure, so a gas leakage phenomenon of the black liquid gasifying furnace and in the gas conveying process can be avoided; and when a spray gun is blocked, the spray gun can be momentarily replaced and processed, so the production efficiency is improved, and the production cost is reduced.
Description
Technical field
The present invention relates to pulping back liquor processing, relate in particular to a kind of micro-negative pressure black liquor gasification method and system device.
Background technology
The black liquor that paper-making pulping process produces is containing large number of biological matter, and its total heating value is about 13.4kJ/g-15.6kJ/g, is a kind of available stock.The traditional treatment method of black liquor is that the black liquor after concentrated is burnt in alkali recovery furnace, then utilizes or dispose the various products that burning obtains.This treatment process seriously polluted, the rate of recovery of heat energy is also low.And black liquor gasification technology is as a kind of novel replacement scheme, can effectively improve the quantity discharged of heat utilization rate and the minimizing pollutent of black liquor, can not only improve significantly the economic benefit of enterprise, can also make enterprise more easily adapt to more and more higher emission standard.
Current, in black liquor gasification method both domestic and external, pressurization or the atmospheric gasifications of adopting react more.For compressive reaction system, vapourizing furnace need to possess resistance to compression function, when occasional leak air or spray gun stop up time; need entirety to shut down and process, have a strong impact on production efficiency, more need to carry out the preheating again of vapourizing furnace; cause thus a large amount of fuel consumptions, increase production cost.Atmospheric gasification method also exists and there will be gas leakage and spray gun stopping state.Therefore, the present invention proposes micro-negative pressure black liquor gasification method and system device.
Summary of the invention
The problem that the serious and conventional black liquor gasification method of black liquor pollution that the object of the invention is to produce for paper-making pulping process exists; a kind of micro-negative pressure black liquor gasification method and system device is provided; the method and device have been avoided gas leak phenomenon completely; there is the not smooth situation of charging in producing time; can random processing; avoid entirety to shut down, enhance productivity.
Technical scheme of the present invention is:
A kind of micro-negative pressure black liquor gasification method, the method is take black liquor as raw material, take oxygen as ignition dope, take water vapor as vaporized chemical, take black liquor gasification stove as reactor, under high temperature and micro-condition of negative pressure, make black liquor generating gasification, generate thick gasification gas, thick gasification gas reclaims heat through waste heat boiler, then passes through spraying cooling and FGD by spraying mist, obtains with H
2with the CO purification gasification gas that is main component.
The above micro-negative pressure black liquor gasification method, described black liquor is papermaking system
paper pulpin process, washing
boilingrear paper pulp
wash wash liquid, the black liquor of preferred weight percent 40-75%.
The above micro-negative pressure black liquor gasification method, described micro-negative pressure is by the gasify suction function of air compressor of frequency conversion, makes black liquor gasification stove, alkali fusion thing dissolving vessel, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower, gas buffer tank maintain a kind of micro-vacuum state.Described micro-negative pressure be preferably 80～100kPa.
The above micro-negative pressure black liquor gasification method, described oxygen is oxygen generation system in situ preparation.
The above micro-negative pressure black liquor gasification method, described water vapor is that the black liquor vaporizing that sprays into black liquor gasification furnace interior under hot conditions produces.Described hot conditions is preferably 900-1500 ℃.
For a system and device for the above micro-negative pressure black liquor gasification method, this system and device comprises that oxygen generation system, black liquor gasification stove, alkali fusion thing dissolving vessel, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower, gas buffer tank, frequency conversion gasification air compressor and gasification gas-reservoir deposit tank.This system and device, by the gasify suction function of air compressor of frequency conversion, at a kind of micro-vacuum state, completes the production of black liquor gasification gas by system held.
The above is for the system and device of micro-negative pressure black liquor gasification method, described oxygen generation system is connected with the oxygen intake of black liquor gasification stove by pipeline, black liquor atomizing lance is arranged on the spray gun seat of black liquor gasification stove, preheated fuel gas pipeline is connected with preheated fuel gas entrance, and oxygen, black liquor and preheated fuel gas are transported in body of heater; Gasification gas and alkali fusion thing discharge line are installed in the side of black liquor gasification stove bottom, alkaline-resisting, the corrosion-resistant thermal insulation material of this discharge line liner, discharge line stage casing downside is provided with opening, and connects alkali fusion thing dissolving vessel, the alkali fusion thing that black liquor gasification fire grate is gone out dissolves, and is converted into green liquor; The end of discharge line connects waste heat boiler, to reclaim the heat of hot gas gas; Waste heat boiler upper outside and alkali fusion thing dissolving vessel upper outside are connected with respectively hot gas discharge line and water vapor discharge line; These two pipelines are all connected to the bottom of hot gas water cooling tower; Hot gas water cooling tower is installed cold air delivery pipe road, is connected to the bottom of FGD by spraying mist tower, then connects gas buffer tank by thionizer top through piping; Surge tank is connected with frequency conversion gasification air compressor, by the gasify suction function of air compressor of frequency conversion, make black liquor gasification stove, alkali fusion thing dissolving vessel, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower, gas buffer tank maintain a kind of micro-vacuum state, purification gasification cyclostrophic is moved on to gasification gas hold tank simultaneously.
Alkali fusion thing dissolving vessel, water vapor discharge line and hot gas discharge line preferably alkaline-resisting by having, corrosion resistant carbon steel or 402 stainless steels are made.Hot gas water cooling tower, FGD by spraying mist tower, gas buffer tank and gasification gas-reservoir are deposited tank and are preferably made up of carbon steel.Waste heat boiler preferably adopts fin heat exchanger tube to absorb the sensible heat of hot gas, can reduce the outer fouling of pipe.Waste heat boiler, frequency conversion gasification air compressor and oxygen generation system are all ripe commodity, can directly buy, and entrust and install.
Size, the quantity of the above equipment are directly proportional to black liquor treatment capacity.To process 25 tons of black liquor day as example, the specification of equipment is: 1,25T/D black liquor gasification stove, and intracavity diameter is designed to 1.21m, inner chamber total height 4.2m, shell has the uprising function of 0.5Mpa.1 of waste heat boiler, 0.5T/h; 1 5.0m of hot gas water cooling tower
3; 1, FGD by spraying mist tower, 5.0m
3; 2, gas buffer tank, 2 × 5.0m
3; 2 of frequency conversion gasification air compressors, free air delivery 2 × 250m
3/ h, intake pressure 8-10kPa, outlet pressure 0.3MPa; Some of gasification gas hold tanks, cumulative volume 200m
3, pressure design 0.5MPa.
Adopt the above micro-negative pressure black liquor gasification system device by the working method of black liquor gasification and principle to be:
Transferpump is sent black liquor into atomizing lance, and the concurrent fog of black liquor and oxygen mix in spray gun forms mixing jet, sprays in black liquor gasification stove.Black liquor small droplets after atomization through super-dry, cracking, burning and coke gasification, is converted into containing H in hot environment
2, CO, CO
2with the black liquor gasification gas of water vapor and a small amount of sulfide, and alkaline melts take sodium carbonate as main component.Black liquor gasification gas and alkaline melts are all discharged from the discharge line that is located at black liquor gasification furnace bottom.Promoted and action of gravity by air-flow, there is the alkaline melts of certain viscosity, flow into alkali fusion thing dissolving vessel, after contacting with water, cool, dissolve, generate green liquor, and produce water vapor.
Start oxygen generation system, produce continuously enough oxygen, and be transported to black liquor gasification stove.Burning fuel oil or combustion gas are to the preheating of black liquor gasification stove, in the time that furnace temperature is 500-700 ℃, spray into the black liquor that weight percent is 40-75%, allow fuel oil or combustion gas and black liquor mixed firing, make furnace temperature rise to 1000-1500 ℃, keeping, under furnace temperature rising or constant prerequisite, reducing gradually fuel oil or gas flow, until stop fuel or combustion gas, black liquor is burnt separately.Maintain black liquor and burn separately after 10-30 minute, adjust oxygen and black liquor flow, making the weight ratio of oxygen and black liquor is 0.4-0.48, reaches normal vaporized state.
Be 700-900 ℃ from the gasification temperature degree of black liquor gasification furnace gas gas and the discharge of alkali fusion thing relief outlet, be introduced into waste heat boiler, reclaim sensible heat wherein.The hot exhaust gas temperature of discharging from waste heat boiler is 150-250 ℃, this hot exhaust gas mixes with the water vapor producing at alkali fusion thing dissolving vessel, is introduced into hot gas water cooling tower, adopts aqueous sodium carbonate or green liquor spray, make the temperature of gas drop to approximately 80 ℃, and remove the CO of dust, part
2and gaseous sulfide; Introduce FGD by spraying mist tower from hot gas water cooling tower Quilt with air conditioning out, adopt aqueous sodium carbonate or green liquor spray, remove dust completely, remove more than 95% CO
2and gaseous sulfide, be purified gasification gas.Purification gasification gas is introduced into gas buffer tank, then through special frequency conversion gasification air compressor compression, transfers in gasification gas hold tank and store, and utilizes for producing.System is by the control of DCS system, the variation of the operating frequency by 2 frequency conversions gasification air compressors maintains reactive system at a kind of micro-vacuum state, the preferably 80～100kPa of pressure negative pressure value of black liquor gasification stove, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower and gas surge tank.In gasification gas hold tank, gaseous tension is 0.3-0.5MPa.
The invention has the beneficial effects as follows:
1. black liquor gasification method of the present invention is carried out under micro-condition of negative pressure, and extraneous gas, to reaction system internal motion, has been avoided the gas leak phenomenon of black liquor gasification stove and gas course of conveying.
2. adopt black liquor gasification method of the present invention, in the time that spray gun stops up, can change at any time processing, do not need entirety to shut down, improved production efficiency, reduce production costs.
3. system and device of the present invention carries out under micro-condition of negative pressure, does not need to possess resistance to compression function, device fabrication cost reduction, and more durable.
Accompanying drawing explanation
Fig. 1 is the sectional view of the micro-negative pressure black liquor gasification system of the present invention device.
Device name and sequence number in figure:
1. black liquor gasification stove; 2. alkali fusion thing dissolving vessel; 3. water vapor discharge line; 4. waste heat boiler; 5. hot gas discharge line; 6. hot gas water cooling tower; 7. cold air delivery pipe road; 8. FGD by spraying mist tower; 9. gas buffer tank; 10. frequency conversion gasification air compressor; 11. gasification gas hold tanks; 12. oxygen generation systems.
As shown in Figure 1, for the system and device of micro-negative pressure black liquor gasification method, mainly comprise that oxygen generation system 12, black liquor gasification stove 1, alkali fusion thing dissolving vessel 2, waste heat boiler 4, hot gas water cooling tower 6, FGD by spraying mist tower 8, gas buffer tank 9, frequency conversion gasification air compressor 10 and gasification gas-reservoir deposit tank 11.Oxygen generation system 12 is connected with the oxygen intake of black liquor gasification stove 1 by pipeline, and black liquor atomizing lance is arranged on the spray gun seat of black liquor gasification stove 1, and preheated fuel gas pipeline is connected with preheated fuel gas entrance, and oxygen, black liquor and preheated fuel gas are transported in body of heater; Gasification gas and alkali fusion thing discharge line are installed in the side of black liquor gasification stove 1 bottom, alkaline-resisting, the corrosion-resistant thermal insulation material of this discharge line liner, discharge line stage casing downside is provided with opening, and connects alkali fusion thing dissolving vessel 2, the alkali fusion thing that black liquor gasification stove 1 is discharged dissolves, and is converted into green liquor; The end of discharge line connects waste heat boiler 4, to reclaim the heat of hot gas gas; Waste heat boiler 4 upper outside and alkali fusion thing dissolving vessel 2 upper outside are connected with respectively hot gas discharge line 5 and water vapor discharge line 3; These two pipelines are all connected to the bottom of hot gas water cooling tower 6; Hot gas water cooling tower 6 is installed cold air delivery pipe road 7, is connected to the bottom of FGD by spraying mist tower 8, then connects gas buffer tank 9 by thionizer 8 tops through piping; Surge tank 9 is connected with frequency conversion gasification air compressor 10, by the gasify suction function of air compressor 10 of frequency conversion, make black liquor gasification stove 1, alkali fusion thing dissolving vessel 2, waste heat boiler 4, hot gas water cooling tower 6, FGD by spraying mist tower 8, gas buffer tank 9 maintain a kind of micro-vacuum state, purification gasification cyclostrophic is moved on to gasification gas hold tank 11 simultaneously.
Embodiment
Below in conjunction with accompanying drawing 1 and embodiment, the present invention is elaborated.
Embodiment 1
Start oxygen generation system 12, produce continuously enough oxygen, and be transported to black liquor gasification stove 1.Burning fuel oil is to 1 preheating of black liquor gasification stove, in the time that furnace temperature reaches 500 ℃, spray into weight percent and be 75% black liquor, allow fuel oil and black liquor mixed firing, make furnace temperature rise to 1000 ℃, keeping, under furnace temperature rising or constant prerequisite, reducing gradually fuel flow, until stop fuel, black liquor is burnt separately.Maintain the independent burning of black liquor after 10 minutes, adjust oxygen and black liquor flow, making the weight ratio of oxygen and black liquor is 0.4, reaches normal vaporized state.
The alkali fusion thing of discharging from black liquor gasification stove 1, in the 2 interior dissolvings of alkali fusion thing dissolving vessel, generates green liquor, discharges with liquid form, is then transported to hot gas water cooling tower 6 and FGD by spraying mist tower 8, as the chemical of desulfurization and decarburization.Be 900 ℃ from the black liquor gasification stove 1 gasification temperature degree that gas and alkali fusion thing relief outlet discharge that gasifies, be introduced into waste heat boiler 4, reclaim sensible heat wherein.The hot exhaust gas temperature of discharging from waste heat boiler 4 is 250 ℃, and this hot exhaust gas mixes with the water vapor producing at alkali fusion thing dissolving vessel 2, is introduced into hot gas water cooling tower 6, adopts green liquor spray, makes the temperature of gas drop to approximately 80 ℃, and removes the CO of dust, part
2and gaseous sulfide; Introduce FGD by spraying mist tower 8 from hot gas water cooling tower 6 Quilt with air conditioning out, adopt green liquor spray, remove dust completely, remove more than 95% CO
2and gaseous sulfide, be purified gasification gas.Purification gasification gas is introduced into gas buffer tank 9, then compresses through special frequency conversion gasification air compressor 10, transfers in gasification gas hold tank 11 and stores, and utilizes for producing.
System is by the control of DCS system, and the variation of the operating frequency by 2 frequency conversions gasification air compressors maintains the reactive system of black liquor gasification stove, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower and gas surge tank at the micro-vacuum state of 100kPa.In gasification gas hold tank, gaseous tension is 0.5MPa.
Embodiment 2
Start oxygen generation system 12, produce continuously enough oxygen, and be transported to black liquor gasification stove 1.Combustion gas is to 1 preheating of black liquor gasification stove, in the time that furnace temperature reaches 700 ℃, spray into weight percent and be 40% black liquor, allow combustion gas and black liquor mixed firing, make furnace temperature rise to 1500 ℃, keeping, under furnace temperature rising or constant prerequisite, reducing gradually gas flow, until stop supplying with combustion gas, black liquor is burnt separately.Maintain the independent burning of black liquor after 30 minutes, adjust oxygen and black liquor flow, making the weight ratio of oxygen and black liquor is 0.48, reaches normal vaporized state.
The alkali fusion thing of discharging from black liquor gasification stove 1, in the 2 interior dissolvings of alkali fusion thing dissolving vessel, generates green liquor, discharges with liquid form, is then transported to hot gas water cooling tower 6 and FGD by spraying mist tower 8, as the chemical of desulfurization and decarburization.Be 700 ℃ from the black liquor gasification stove 1 gasification temperature degree that gas and alkali fusion thing relief outlet discharge that gasifies, be introduced into waste heat boiler 4, reclaim sensible heat wherein.The hot exhaust gas temperature of discharging from waste heat boiler 4 is 150 ℃, this hot exhaust gas mixes with the water vapor producing at alkali fusion thing dissolving vessel 2, is introduced into hot gas water cooling tower 6, adopts aqueous sodium carbonate spray, make the temperature of gas drop to approximately 80 ℃, and remove the CO of dust, part
2and gaseous sulfide; Introduce FGD by spraying mist tower 8 from hot gas water cooling tower 6 Quilt with air conditioning out, adopt aqueous sodium carbonate spray, remove dust completely, remove more than 95% CO
2and gaseous sulfide, be purified gasification gas.Purification gasification gas is introduced into gas buffer tank 9, then compresses through special frequency conversion gasification air compressor 10, transfers in gasification gas hold tank 11 and stores, and utilizes for producing.
System is by the control of DCS system, and the variation of the operating frequency by 2 frequency conversions gasification air compressors maintains the reactive system of black liquor gasification stove, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower and gas surge tank at the micro-vacuum state of 80kPa.In gasification gas hold tank, gaseous tension is 0.3MPa.
Embodiment 3
Start oxygen generation system 12, produce continuously enough oxygen, and be transported to black liquor gasification stove 1.Burning fuel oil is to 1 preheating of black liquor gasification stove, in the time that furnace temperature reaches 600 ℃, spray into weight percent and be 60% black liquor, allow fuel oil and black liquor mixed firing, make furnace temperature rise to 1200 ℃, keeping, under furnace temperature rising or constant prerequisite, reducing gradually fuel flow, until stop fuel, black liquor is burnt separately.Maintain the independent burning of black liquor after 20 minutes, adjust oxygen and black liquor flow, making the weight ratio of oxygen and black liquor is 0.45, reaches normal vaporized state.
The alkali fusion thing of discharging from black liquor gasification stove 1, in the 2 interior dissolvings of alkali fusion thing dissolving vessel, generates green liquor, discharges with liquid form, is then transported to hot gas water cooling tower 6 and FGD by spraying mist tower 8, as the chemical of desulfurization and decarburization.Be 800 ℃ from the black liquor gasification stove 1 gasification temperature degree that gas and alkali fusion thing relief outlet discharge that gasifies, be introduced into waste heat boiler 4, reclaim sensible heat wherein.The hot exhaust gas temperature of discharging from waste heat boiler 4 is 200 ℃, and this hot exhaust gas mixes with the water vapor producing at alkali fusion thing dissolving vessel 2, is introduced into hot gas water cooling tower 6, adopts green liquor spray, makes the temperature of gas drop to approximately 80 ℃, and removes the CO of dust, part
2and gaseous sulfide; Introduce FGD by spraying mist tower 8 from hot gas water cooling tower 6 Quilt with air conditioning out, adopt green liquor spray, remove dust completely, remove more than 95% CO
2and gaseous sulfide, be purified gasification gas.Purification gasification gas is introduced into gas buffer tank 9, then compresses through special frequency conversion gasification air compressor 10, transfers in gasification gas hold tank 11 and stores, and utilizes for producing.
System is by the control of DCS system, and the variation of the operating frequency by 2 frequency conversions gasification air compressors maintains the reactive system of black liquor gasification stove, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower and gas surge tank at the micro-vacuum state of 90kPa.In gasification gas hold tank, gaseous tension is 0.4MPa.
Embodiment 4
Start oxygen generation system 12, produce continuously enough oxygen, and be transported to black liquor gasification stove 1.Combustion gas is to 1 preheating of black liquor gasification stove, in the time that furnace temperature reaches 600 ℃, spray into weight percent and be 80% black liquor, allow combustion gas and black liquor mixed firing, make furnace temperature rise to 1200 ℃, keeping, under furnace temperature rising or constant prerequisite, reducing gradually gas flow, until stop supplying with combustion gas, black liquor is burnt separately.Maintain the independent burning of black liquor after 30 minutes, adjust oxygen and black liquor flow, making the weight ratio of oxygen and black liquor is 0.45, reaches normal vaporized state.
The alkali fusion thing of discharging from black liquor gasification stove 1, in the 2 interior dissolvings of alkali fusion thing dissolving vessel, generates green liquor, discharges with liquid form, is then transported to hot gas water cooling tower 6 and FGD by spraying mist tower 8, as the chemical of desulfurization and decarburization.Be 800 ℃ from the black liquor gasification stove 1 gasification temperature degree that gas and alkali fusion thing relief outlet discharge that gasifies, be introduced into waste heat boiler 4, reclaim sensible heat wherein.The hot exhaust gas temperature of discharging from waste heat boiler 4 is 200 ℃, and this hot exhaust gas mixes with the water vapor producing at alkali fusion thing dissolving vessel 2, is introduced into hot gas water cooling tower 6, adopts green liquor spray, makes the temperature of gas drop to approximately 80 ℃, and removes the CO of dust, part
2and gaseous sulfide; Introduce FGD by spraying mist tower 8 from hot gas water cooling tower 6 Quilt with air conditioning out, adopt green liquor spray, remove dust completely, remove more than 95% CO
2and gaseous sulfide, be purified gasification gas.Purification gasification gas is introduced into gas buffer tank 9, then compresses through special frequency conversion gasification air compressor 10, transfers in gasification gas hold tank 11 and stores, and utilizes for producing.
System is by the control of DCS system, and the variation of the operating frequency by 2 frequency conversions gasification air compressors maintains the reactive system of black liquor gasification stove, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower and gas surge tank at the micro-vacuum state of 90kPa.In gasification gas hold tank, gaseous tension is 0.4MPa.
Claims (9)
1. a micro-negative pressure black liquor gasification method, it is characterized in that, take black liquor as raw material, take oxygen as ignition dope, take water vapor as vaporized chemical, take black liquor gasification stove as reactor, under high temperature and micro-condition of negative pressure, make black liquor generating gasification, generate thick gasification gas, the gas that slightly gasifies reclaims heat through waste heat boiler, pass through again spraying cooling and FGD by spraying mist, obtain with H
2with the CO purification gasification gas that is main component.
2. micro-negative pressure black liquor gasification method according to claim 1, is characterized in that, the be weight percentage black liquor of 40-75% of described black liquor.
3. according to micro-negative pressure black liquor gasification method described in claim 1 or 2, it is characterized in that, described micro-negative pressure is by the gasify suction function of air compressor of frequency conversion, makes black liquor gasification stove, alkali fusion thing dissolving vessel, waste heat boiler, hot gas water cooling tower, FGD by spraying mist tower, gas buffer tank maintain a kind of micro-vacuum state.
4. micro-negative pressure black liquor gasification method according to claim 3, is characterized in that, the negative pressure value of described micro-negative pressure is 80～100kPa.
5. micro-negative pressure black liquor gasification method according to claim 4, is characterized in that, described oxygen is oxygen generation system in situ preparation.
6. micro-negative pressure black liquor gasification method according to claim 5, is characterized in that, described water vapor is that the black liquor vaporizing that sprays into black liquor gasification furnace interior under hot conditions produces.
7. micro-negative pressure black liquor gasification method according to claim 6, is characterized in that, described hot conditions is 900-1500 ℃.
8. the system and device for the arbitrary described micro-negative pressure black liquor gasification method of claim 1-7, it is characterized in that, this system and device comprises that oxygen generation system (12), black liquor gasification stove (1), alkali fusion thing dissolving vessel (2), waste heat boiler (4), hot gas water cooling tower (6), FGD by spraying mist tower (8), gas buffer tank (9), frequency conversion gasification air compressor (10) and the gas-reservoir that gasifies deposit tank (11).
9. according to claim 8 for the system and device of micro-negative pressure black liquor gasification method, it is characterized in that, described oxygen generation system (12) is connected with the oxygen intake of black liquor gasification stove (1) by pipeline, black liquor atomizing lance is arranged on the spray gun seat of black liquor gasification stove (1), preheated fuel gas pipeline is connected with preheated fuel gas entrance, and oxygen, black liquor and preheated fuel gas are transported in body of heater; Gasification gas and alkali fusion thing discharge line are installed in the side of black liquor gasification stove (1) bottom, alkaline-resisting, the corrosion-resistant thermal insulation material of this discharge line liner, discharge line stage casing downside is provided with opening, and connect alkali fusion thing dissolving vessel (2), the alkali fusion thing that black liquor gasification stove (1) is discharged dissolves, and is converted into green liquor; The end of discharge line connects waste heat boiler (4), to reclaim the heat of hot gas gas; Waste heat boiler (4) upper outside and alkali fusion thing dissolving vessel (2) upper outside are connected with respectively hot gas discharge line (5) and water vapor discharge line (3); These two pipelines are all connected to the bottom of hot gas water cooling tower (6); Hot gas water cooling tower (6) is installed cold air delivery pipe road (7), is connected to the bottom of FGD by spraying mist tower (8), then connects gas buffer tank (9) by thionizer (8) top through piping; Surge tank (9) is connected with frequency conversion gasification air compressor (10), by the gasify suction function of air compressor (10) of frequency conversion, make black liquor gasification stove (1), alkali fusion thing dissolving vessel (2), waste heat boiler (4), hot gas water cooling tower (6), FGD by spraying mist tower (8), gas buffer tank (9) maintain a kind of micro-vacuum state, purification gasification cyclostrophic is moved on to gasification gas hold tank (11) simultaneously.
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| CN116498973B (en) * | 2023-07-03 | 2023-09-22 | 浙江百能科技有限公司 | PTA byproduct solid and liquid waste mixed incineration treatment system |
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