CN102559266B - Method for producing water gas by pure oxygen continuous gasification in fixed bed - Google Patents
Method for producing water gas by pure oxygen continuous gasification in fixed bed Download PDFInfo
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- CN102559266B CN102559266B CN201110447151.8A CN201110447151A CN102559266B CN 102559266 B CN102559266 B CN 102559266B CN 201110447151 A CN201110447151 A CN 201110447151A CN 102559266 B CN102559266 B CN 102559266B
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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
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Abstract
The invention discloses a method for producing water gas by pure oxygen continuous gasification in fixed bed. The method of the invention takes raw coal as a gasification raw material, oxygen and water vapor as the gasification agents, so as to continuously produce water gas in a fixed bed gas furnace. Raw coal continuously enters the furnace from the upper part of the gas furnace, is subjected to treatment in a drying zone and a dry distillation zone and then is subjected to oxidation and decomposition reactions in the gasification layer of the gas furnace with the gasification agents introduced from the bottom of the gas furnace. The water gas produced by the reaction is discharged from an upper gas outlet after treatment in the dry distillation zone and the drying zone. The generated ash slags are discharged from a slag outlet in the lower part of the furnace. The discharged water gas is successively subjected a cyclone dust collector, a heat exchanger, a waste heat boiler and a scrubber tower to obtain high-quality water gas finally. The method of the invention can continuously gasify to produce high quality water gas. The method of the invention has the advantages of high production efficiency and high conversion efficiency of raw coal, and is beneficial for environment protection and has remarkable social and economic benefits.
Description
Technical field
The present invention relates to a kind of production method of water-gas, particularly relate to a kind of with pure oxygen and water vapour for vaporized chemical, utilize fixed bed gasifier continuous gasification to produce the method for water-gas, namely a kind of fixed bed pure oxygen continuous gasification produces the method for water-gas.
Background technology
The major ingredient of water-gas is carbon monoxide and hydrogen.Water-gas is widely used in the Coal Chemical Industry production equipments such as coal chemical industry methanol, ethylene glycol, butyleneglycol, octyl alconyl, synthetic ammonia, synthetic ammonia connection alkali, synthetic ammonia connection alcohol as unstripped gas.
China's coal chemical industry is equipped with fixed bed gasifier more than 4500 platform cover, have most of gas furnace have employed production efficiency is low, environmental-protecting performance is poor intermittent gasification technique, and production efficiency is low, feed coal trans-utilization rate is low.Therefore, cause applying unit deficiency in economic performance, even suffer great loss.
Therefore, coal chemical industry is wanted to solve the problems such as the production efficiency existed in traditional batch gasifying process is low, feed coal trans-utilization rate is low, environmental-protecting performance is poor, need to carry out technological improvement to its technique, research and development one reduces costs, efficiency is high, and environmentally friendly water gas two-stage gasifier method.
Summary of the invention
The object of the invention is to produce the defects such as the production efficiency existed in water-gas technique is low, environmental-protecting performance is poor to overcome existing intermittent gasification, providing a kind of fixed bed pure oxygen continuous gasification to produce the method for water-gas.Utilize technical solution of the present invention to produce water-gas, its production efficiency is higher, feed coal trans-utilization rate is higher, and is conducive to environmental protection.
In order to solve the problem, the technical solution used in the present invention is:
The invention provides a kind of method that fixed bed pure oxygen continuous gasification produces water-gas, described production method comprises the following steps:
The preparation of a, raw material: to produce 1kNm
3water-gas is benchmark, needs the amount of each raw material to be respectively feed coal 470 ~ 500kg, pure oxygen 240 ~ 270Nm
3, water vapour 490 ~ 560kg, its Raw pure oxygen and water vapour are as vaporized chemical;
B, proportion scale according to step a is prepared various raw material, feed coal adopts automatic defeated device for coal to carry, and measured by belted electronic balance, feed coal through metering enters in stove continuously from fixed bed gasifier top, feed coal enters after fixed bed gasifier from top to bottom successively through drying zone, dry distillation area processes, the reaction of oxidizing reaction Sum decomposition is carried out with the vaporized chemical pure oxygen passed into from bed gas furnace bottom and the gasification layer of water vapour in gas furnace after process, carbon dioxide reduction in the reducing zone water-gas of the water-gas produced after reaction in gas furnace becomes carbon monoxide, again after Exchange of apparent heat is carried out in dry distillation area and drying zone, discharged by air outlet, gas furnace top, the air outlet temperature of discharging water-gas is 350 ~ 400 DEG C, the lime-ash produced in reaction process is discharged by gas furnace lower tapping hole, the ash temperature of discharging is 150 ~ 200 DEG C,
The water-gas that c, step b are discharged by fixed bed gasifier air outlet enters tornado dust collector and is separated, and removes the granularity >=50 object coal dust carried secretly in water-gas;
D, water-gas after step c process enter interchanger, utilize waste-heat vaporized chemical pure oxygen and the water vapour of water-gas, are increased to 220 ~ 240 DEG C through the pure oxygen of water-gas waste-heat and the temperature of water vapour by 120 ~ 130 DEG C; Water-gas after interchanger UTILIZATION OF VESIDUAL HEAT IN enters waste heat boiler and again carries out UTILIZATION OF VESIDUAL HEAT IN, and the temperature that the water-gas after waste heat boiler UTILIZATION OF VESIDUAL HEAT IN goes out waste heat boiler drops to 130 ~ 150 DEG C;
E, water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enter scrubber tower to carry out cleaning, lowering the temperature, clean through scrubber tower, wash the dust of coal tar and the suspension of carrying secretly in water-gas, and make to carry secretly in water-gas do not have the water vapour decomposed to be cooled to water to enter cooling circulating water system and re-use, water-gas temperature≤45 DEG C after scrubber tower process;
F, after the process of step e scrubber tower, obtain product water coal gas, products obtained therefrom water-gas is sent into gas holder for postorder.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, described feed coal is hard coal, coke, moulded coal or semicoke.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, described pure oxygen purity is >=99.6%.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, the temperature of drying zone described in step b is 350 ~ 400 DEG C.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, the temperature of dry distillation area described in step b is 600 ~ 750 DEG C.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, the temperature of gasification layer described in step b is 1000 ~ 1300 DEG C.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, carbon molecular weight residual in the lime-ash of discharging in step b accounts for the content < 10% of lime-ash gross weight.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, waste heat boiler described in steps d is divided into two sections, and epimere is superheat section, for improving the temperature of self-produced steam, makes its temperature bring up to 200 DEG C by 110 DEG C; Hypomere is the sensible heat generation saturation steam that waste heat boiler absorbs water-gas.
The method of water-gas is produced according to above-mentioned fixed bed pure oxygen continuous gasification, water-gas described in step e after steps d UTILIZATION OF VESIDUAL HEAT IN enters scrubber tower to carry out cleaning, lowering the temperature, and wherein the water-gas process of cleaning in scrubber tower sprays backwash and the cleaning of tower top packing section in boiling washing, tower at the bottom of tower successively.
Produce the method for water-gas according to above-mentioned fixed bed pure oxygen continuous gasification, in step f, in products obtained therefrom water-gas, essential substance composition and content thereof are respectively: CO
212 ~ 17%, O
20.1 ~ 0.3%, CO 39 ~ 42%, H
240 ~ 44%, N
20.3 ~ 0.8% and CH
4≤ 1.0%.
The chemical reaction of each material of the present invention in fixed bed gasifier in gasification mainly contains:
C+O
2＝CO
2+Q
2C+O
2＝2CO+Q
CO
2+C＝2CO-Q
2CO+O
2＝2CO
2+Q
C+H
2O＝CO+H
2-Q
C+2H
2O＝CO
2+2H
2-Q
CO+H
2O＝CO
2+H
2+Q
C+2H
2＝CH
4+Q
Fixed bed pure oxygen continuous gasification of the present invention produces the method for water-gas, its production system major equipment is fixed bed gasifier, supporting system device has tornado dust collector, interchanger, waste heat boiler, scrubber tower, the isolated groove of safety, and DCS automatic control system, oil pressure control system, process valve, process pipe, recirculating cooling water system etc.
Pure oxygen continuous gasification of the present invention produces water-gas, gasified raw material is made with anthracite block coal, coke, moulded coal or semicoke (also claiming " blue charcoal "), vaporized chemical is made, continuous gasification production high quality water coal gas under hot conditions in gas furnace with pure oxygen (>=99.6%) and water vapor.
positive beneficial effect of the present invention:
1, technical solution of the present invention makes gasified raw material with feed coal, using pure oxygen, water vapour as vaporized chemical, and continuous gasification production high quality water coal gas under hot conditions in fixed bed gasifier.A nitrogen content low (≤0.8%), carbon monoxide and hydrogen content higher (the two content sum can reach 80 ~ 86%) in products obtained therefrom high quality water coal gas of the present invention.Because a nitrogen content is for about 5% in the water-gas produced with traditional batch gasifying process.
2, the high quality water gas composition utilizing technical solution of the present invention to produce is more suitable for the unstripped gas making alcohols Chemicals.Because in alcohols Coal Chemical Industry production process, nitrogen is invalid gas, a nitrogen content≤0.8% in the water-gas that gasifying process of the present invention is produced, during unstripped gas as alcohols Chemicals, do not need to carry out purifying treatment in addition, effectively can reduce alcohols Chemicals production cost.
3, technical solution of the present invention continuous gasification is utilized to produce water-gas, carbon molecular weight residual in the lime-ash wherein produced accounts for the content < 10% of lime-ash gross weight, compared with traditional technology, its lime-ash carbon residue reduces by more than 50% (content that carbon molecular weight residual in the lime-ash produced in traditional technology accounts for lime-ash gross weight is 20 ~ 23%) than traditional technology, thus its feed coal trans-utilization rate is improved, reduce the consumption of feed coal; Lime-ash temperature out < 200 DEG C in addition, the low and deslagging temperature of this lime-ash carbon left is low is one of technical solution of the present invention outstanding feature.
4, technical solution of the present invention continuous gasification is utilized to produce water-gas, when the water-gas produced exports eliminating by gas furnace, the air outlet temperature of its water-gas can be reduced to 350 ~ 400 DEG C, this air outlet temperature is compared with traditional technology, its water-gas air outlet temperature reduces more than 200 DEG C (water-gas that traditional batch gasification is produced, its air outlet temperature >=600 DEG C).The height of this water-gas air outlet temperature weighs gasifying process reasonableness and energy-saving important indicator, and its air outlet temperature lower explanation gasifying process is more reasonable, energy-conservation.So water-gas air outlet temperature is lower is one of technical solution of the present invention outstanding feature.
5, compared with producing water-gas with conventional batch gasifying process, technical solution of the present invention list stove gas production rate can improve 1 times.
6, compared with traditional technology, production technique of the present invention simplifies production process, separate unit gas furnace system decreases 8 oil pressure automatic valves (traditional technology 13, continuous gasification process of the present invention 5), perfect further safety precautions, add and overlap safety detection, safety interlock more, the security of production system increases substantially.
7, technical solution of the present invention enhances the feature of environmental protection, is conducive to environment protection, has significant social benefit:
A, the blowing stage that present invention eliminates in production process change continuous gasification into, and separate unit gas furnace is per hour reduces fume emission about 6000Nm3/h;
In b, production process of the present invention, the working equipment such as coal, ash discharge all uses full-sealing device instead, and the dust rate of leaking equals zero;
C, present invention eliminates high power air blowers (power 450kw/h), eliminate the noise pollution source that gas making workshop is maximum, and reduce power consumption, correspondingly reduce production cost;
D, level of automation improve: the supporting DCS of complete assembly of the present invention controls automatically, complete monitoring carried out to coal quantity, ash discharge quantity, oxygen flow and pressure, steam flow and the operational process of craft such as pressure, oil pressure and automatically regulates, substantially increasing working efficiency.
E, reduction energy consumption; Unit product comprehensive energy consumption reduces by 25 ~ 30%.
8, utilize technical solution of the present invention can produce water-gas by continuous gasification, and gained water-gas quality is higher.Its production efficiency of water-gas is higher, feed coal trans-utilization rate is higher to utilize the present invention to produce, and is conducive to environmental protection, has significant economic benefit and social benefit.
four, embodiment:
Set forth the present invention further below in conjunction with embodiment, but do not limit content of the present invention.
Embodiment 1:
A kind of fixed bed pure oxygen of the present invention continuous gasification produces the method for water-gas, and described production method comprises the following steps:
The preparation of a, raw material: to produce 1kNm
3water-gas is benchmark, needs the amount of each raw material to be respectively anthracite block coal 490kg, pure oxygen 260Nm
3(pure oxygen purity is>=99.6%), water vapour 520kg, its Raw pure oxygen and water vapour are as vaporized chemical;
B, proportion scale according to step a is prepared various raw material, anthracite block coal adopts automatic defeated device for coal to carry, and measured by belted electronic balance, anthracite block coal through metering enters in stove continuously from fixed bed gasifier top, anthracite block coal enters after fixed bed gasifier from top to bottom successively through drying zone, dry distillation area processes, the reaction of oxidizing reaction Sum decomposition is carried out with the vaporized chemical pure oxygen passed into from bed gas furnace bottom and the gasification layer of water vapour in gas furnace after process, carbon dioxide reduction in the reducing zone water-gas of the water-gas produced after reaction in gas furnace becomes carbon monoxide, again after Exchange of apparent heat is carried out in dry distillation area and drying zone, discharged by air outlet, gas furnace top, the air outlet temperature of discharging water-gas is 350 ~ 400 DEG C, the lime-ash produced in reaction process is discharged by gas furnace lower tapping hole, the ash temperature of discharging is 150 ~ 200 DEG C (carbon molecular weight residual in the lime-ash of discharge accounts for the content < 10% of lime-ash gross weight),
The water-gas that c, step b are discharged by fixed bed gasifier air outlet enters tornado dust collector and is separated, and removes the granularity >=50 object coal dust carried secretly in water-gas;
D, water-gas after step c process enter interchanger, utilize waste-heat vaporized chemical pure oxygen and the water vapour of water-gas, are increased to 220 ~ 240 DEG C through the pure oxygen of water-gas waste-heat and the temperature of water vapour by 120 ~ 130 DEG C; Water-gas after interchanger UTILIZATION OF VESIDUAL HEAT IN enters waste heat boiler and again carries out UTILIZATION OF VESIDUAL HEAT IN, and the temperature that the water-gas after waste heat boiler UTILIZATION OF VESIDUAL HEAT IN goes out waste heat boiler drops to 130 ~ 150 DEG C;
Wherein waste heat boiler is divided into two sections, and epimere is superheat section, for improving the temperature of self-produced steam, makes its temperature bring up to 200 DEG C by 110 DEG C; Hypomere is the sensible heat generation saturation steam that waste heat boiler absorbs water-gas;
E, water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enter scrubber tower to carry out cleaning, lowering the temperature, wherein the water-gas process of cleaning in scrubber tower sprays backwash and the cleaning of tower top packing section in boiling washing, tower at the bottom of tower successively, through the cleaning of scrubber tower, wash the dust of coal tar and the suspension of carrying secretly in water-gas, and make to carry secretly in water-gas do not have the water vapour decomposed to be cooled to water to enter cooling circulating water system and re-use, water-gas temperature≤45 DEG C after scrubber tower process;
F, after the process of step e scrubber tower, obtain product water coal gas, products obtained therefrom water-gas is sent into gas holder for postorder.
Embodiment 2:
A kind of fixed bed pure oxygen of the present invention continuous gasification produces the method for water-gas, and described production method comprises the following steps:
The preparation of a, raw material: to produce 1kNm
3water-gas is benchmark, needs the amount of each raw material to be respectively anthracite block coal 500kg, pure oxygen 270Nm
3(pure oxygen purity is>=99.6%), water vapour 560kg, its Raw pure oxygen and water vapour are as vaporized chemical;
B, proportion scale according to step a is prepared various raw material, anthracite block coal adopts automatic defeated device for coal to carry, and measured by belted electronic balance, anthracite block coal through metering enters in stove continuously from fixed bed gasifier top, anthracite block coal enters after fixed bed gasifier from top to bottom successively through drying zone, dry distillation area processes, the reaction of oxidizing reaction Sum decomposition is carried out with the vaporized chemical pure oxygen passed into from bed gas furnace bottom and the gasification layer of water vapour in gas furnace after process, carbon dioxide reduction in the reducing zone water-gas of the water-gas produced after reaction in gas furnace becomes carbon monoxide, again after Exchange of apparent heat is carried out in dry distillation area and drying zone, discharged by air outlet, gas furnace top, the air outlet temperature of discharging water-gas is 350 ~ 400 DEG C, the lime-ash produced in reaction process is discharged by gas furnace lower tapping hole, the ash temperature of discharging is 150 ~ 200 DEG C (carbon molecular weight residual in the lime-ash of discharge accounts for the content < 10% of lime-ash gross weight),
The water-gas that c, step b are discharged by fixed bed gasifier air outlet enters tornado dust collector and is separated, and removes the granularity >=50 object coal dust carried secretly in water-gas;
D, water-gas after step c process enter interchanger, utilize waste-heat vaporized chemical pure oxygen and the water vapour of water-gas, are increased to 220 ~ 240 DEG C through the pure oxygen of water-gas waste-heat and the temperature of water vapour by 120 ~ 130 DEG C; Water-gas after interchanger UTILIZATION OF VESIDUAL HEAT IN enters waste heat boiler and again carries out UTILIZATION OF VESIDUAL HEAT IN, and the temperature that the water-gas after waste heat boiler UTILIZATION OF VESIDUAL HEAT IN goes out waste heat boiler drops to 130 ~ 150 DEG C;
Wherein waste heat boiler is divided into two sections, and epimere is superheat section, for improving the temperature of self-produced steam, makes its temperature bring up to 200 DEG C by 110 DEG C; Hypomere is the sensible heat generation saturation steam that waste heat boiler absorbs water-gas;
E, water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enter scrubber tower to carry out cleaning, lowering the temperature, wherein the water-gas process of cleaning in scrubber tower sprays backwash and the cleaning of tower top packing section in boiling washing, tower at the bottom of tower successively, through the cleaning of scrubber tower, wash the dust of coal tar and the suspension of carrying secretly in water-gas, and make to carry secretly in water-gas do not have the water vapour decomposed to be cooled to water to enter cooling circulating water system and re-use, water-gas temperature≤45 DEG C after scrubber tower process;
F, after the process of step e scrubber tower, obtain product water coal gas, products obtained therefrom water-gas is sent into gas holder for postorder.
Embodiment 3:
A kind of fixed bed pure oxygen of the present invention continuous gasification produces the method for water-gas, and described production method comprises the following steps:
The preparation of a, raw material: to produce 1kNm
3water-gas is benchmark, needs the amount of each raw material to be respectively moulded coal 470kg, pure oxygen 240Nm
3(pure oxygen purity is>=99.6%), water vapour 490kg, its Raw pure oxygen and water vapour are as vaporized chemical;
B, proportion scale according to step a is prepared various raw material, moulded coal adopts automatic defeated device for coal to carry, and measured by belted electronic balance, moulded coal through metering enters in stove continuously from fixed bed gasifier top, moulded coal enters after fixed bed gasifier from top to bottom successively through drying zone, dry distillation area processes, the reaction of oxidizing reaction Sum decomposition is carried out with the vaporized chemical pure oxygen passed into from bed gas furnace bottom and the gasification layer of water vapour in gas furnace after process, carbon dioxide reduction in the reducing zone water-gas of the water-gas produced after reaction in gas furnace becomes carbon monoxide, again after Exchange of apparent heat is carried out in dry distillation area and drying zone, discharged by air outlet, gas furnace top, the air outlet temperature of discharging water-gas is 350 ~ 400 DEG C, the lime-ash produced in reaction process is discharged by gas furnace lower tapping hole, the ash temperature of discharging is 150 ~ 200 DEG C (carbon molecular weight residual in the lime-ash of discharge accounts for the content < 10% of lime-ash gross weight),
The water-gas that c, step b are discharged by fixed bed gasifier air outlet enters tornado dust collector and is separated, and removes the granularity >=50 object coal dust carried secretly in water-gas;
D, water-gas after step c process enter interchanger, utilize waste-heat vaporized chemical pure oxygen and the water vapour of water-gas, are increased to 220 ~ 240 DEG C through the pure oxygen of water-gas waste-heat and the temperature of water vapour by 120 ~ 130 DEG C; Water-gas after interchanger UTILIZATION OF VESIDUAL HEAT IN enters waste heat boiler and again carries out UTILIZATION OF VESIDUAL HEAT IN, and the temperature that the water-gas after waste heat boiler UTILIZATION OF VESIDUAL HEAT IN goes out waste heat boiler drops to 130 ~ 150 DEG C;
Wherein waste heat boiler is divided into two sections, and epimere is superheat section, for improving the temperature of self-produced steam, makes its temperature bring up to 200 DEG C by 110 DEG C; Hypomere is the sensible heat generation saturation steam that waste heat boiler absorbs water-gas;
E, water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enter scrubber tower to carry out cleaning, lowering the temperature, wherein the water-gas process of cleaning in scrubber tower sprays backwash and the cleaning of tower top packing section in boiling washing, tower at the bottom of tower successively, through the cleaning of scrubber tower, wash the dust of coal tar and the suspension of carrying secretly in water-gas, and make to carry secretly in water-gas do not have the water vapour decomposed to be cooled to water to enter cooling circulating water system and re-use, water-gas temperature≤45 DEG C after scrubber tower process;
F, after the process of step e scrubber tower, obtain product water coal gas, products obtained therefrom water-gas is sent into gas holder for postorder.
Embodiment 4:
A kind of fixed bed pure oxygen of the present invention continuous gasification produces the method for water-gas, and described production method comprises the following steps:
The preparation of a, raw material: to produce 1kNm
3water-gas is benchmark, needs the amount of each raw material to be respectively anthracite block coal 480kg, pure oxygen 250Nm
3(pure oxygen purity is>=99.6%), water vapour 500kg, its Raw pure oxygen and water vapour are as vaporized chemical;
B, proportion scale according to step a is prepared various raw material, anthracite block coal adopts automatic defeated device for coal to carry, and measured by belted electronic balance, anthracite block coal through metering enters in stove continuously from fixed bed gasifier top, anthracite block coal enters after fixed bed gasifier from top to bottom successively through drying zone, dry distillation area processes, the reaction of oxidizing reaction Sum decomposition is carried out with the vaporized chemical pure oxygen passed into from bed gas furnace bottom and the gasification layer of water vapour in gas furnace after process, carbon dioxide reduction in the reducing zone water-gas of the water-gas produced after reaction in gas furnace becomes carbon monoxide, again after Exchange of apparent heat is carried out in dry distillation area and drying zone, discharged by air outlet, gas furnace top, the air outlet temperature of discharging water-gas is 350 ~ 400 DEG C, the lime-ash produced in reaction process is discharged by gas furnace lower tapping hole, the ash temperature of discharging is 150 ~ 200 DEG C (carbon molecular weight residual in the lime-ash of discharge accounts for the content < 10% of lime-ash gross weight),
The water-gas that c, step b are discharged by fixed bed gasifier air outlet enters tornado dust collector and is separated, and removes the granularity >=50 object coal dust carried secretly in water-gas;
D, water-gas after step c process enter interchanger, utilize waste-heat vaporized chemical pure oxygen and the water vapour of water-gas, are increased to 220 ~ 240 DEG C through the pure oxygen of water-gas waste-heat and the temperature of water vapour by 120 ~ 130 DEG C; Water-gas after interchanger UTILIZATION OF VESIDUAL HEAT IN enters waste heat boiler and again carries out UTILIZATION OF VESIDUAL HEAT IN, and the temperature that the water-gas after waste heat boiler UTILIZATION OF VESIDUAL HEAT IN goes out waste heat boiler drops to 130 ~ 150 DEG C;
Wherein waste heat boiler is divided into two sections, and epimere is superheat section, for improving the temperature of self-produced steam, makes its temperature bring up to 200 DEG C by 110 DEG C; Hypomere is the sensible heat generation saturation steam that waste heat boiler absorbs water-gas;
E, water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enter scrubber tower to carry out cleaning, lowering the temperature, wherein the water-gas process of cleaning in scrubber tower sprays backwash and the cleaning of tower top packing section in boiling washing, tower at the bottom of tower successively, through the cleaning of scrubber tower, wash the dust of coal tar and the suspension of carrying secretly in water-gas, and make to carry secretly in water-gas do not have the water vapour decomposed to be cooled to water to enter cooling circulating water system and re-use, water-gas temperature≤45 DEG C after scrubber tower process;
F, after the process of step e scrubber tower, obtain product water coal gas, products obtained therefrom water-gas is sent into gas holder for postorder.
Utilize aforesaid method of the present invention to prepare essential substance composition and content thereof in products obtained therefrom water-gas to be respectively: CO
212 ~ 17%, O
20.1 ~ 0.3%, CO 39 ~ 42%, H
240 ~ 44%, N
20.3 ~ 0.8% and CH
4≤ 1.0%.
Claims (1)
1. fixed bed pure oxygen continuous gasification produces a method for water-gas, and it is characterized in that, described production method comprises the following steps:
The preparation of a, raw material: to produce 1kNm
3water-gas is benchmark, needs the amount of each raw material to be respectively feed coal 470 ~ 500kg, pure oxygen 240 ~ 270Nm
3, water vapour 490 ~ 560kg, its Raw pure oxygen and water vapour are as vaporized chemical; Described feed coal is hard coal, coke, moulded coal or semicoke, and described pure oxygen purity is>=99.6%;
B, the proportion scale according to step a is prepared various raw material, feed coal adopts automatic defeated device for coal to carry, and measured by belted electronic balance, feed coal through metering enters in stove continuously from fixed bed gasifier top, feed coal after entering fixed bed gasifier from top to bottom successively through drying zone, dry distillation area processes, the temperature of drying zone is 350 ~ 400 DEG C, and the temperature of dry distillation area is 600 ~ 750 DEG C, the reaction of oxidizing reaction Sum decomposition is carried out with the vaporized chemical pure oxygen passed into from bed gas furnace bottom and the gasification layer of water vapour in gas furnace after process, the temperature of described gasification layer is 1000 ~ 1300 DEG C, carbon dioxide reduction in the reducing zone water-gas of the water-gas produced after reaction in gas furnace becomes carbon monoxide, again after Exchange of apparent heat is carried out in dry distillation area and drying zone, discharged by air outlet, gas furnace top, the air outlet temperature of discharging water-gas is 350 ~ 400 DEG C, the lime-ash produced in reaction process is discharged by gas furnace lower tapping hole, carbon molecular weight residual in the lime-ash of discharging accounts for the content < 10% of lime-ash gross weight, the ash temperature of discharging is 150 ~ 200 DEG C,
The water-gas that c, step b are discharged by fixed bed gasifier air outlet enters tornado dust collector and is separated, and removes the granularity >=50 object coal dust carried secretly in water-gas;
D, water-gas after step c process enter interchanger, utilize waste-heat vaporized chemical pure oxygen and the water vapour of water-gas, are increased to 220 ~ 240 DEG C through the pure oxygen of water-gas waste-heat and the temperature of water vapour by 120 ~ 130 DEG C; Water-gas after interchanger UTILIZATION OF VESIDUAL HEAT IN enters waste heat boiler and again carries out UTILIZATION OF VESIDUAL HEAT IN, and the temperature that the water-gas after waste heat boiler UTILIZATION OF VESIDUAL HEAT IN goes out waste heat boiler drops to 130 ~ 150 DEG C;
Waste heat boiler described in steps d is divided into two sections, and epimere is superheat section, for improving the temperature of self-produced steam, makes its temperature bring up to 200 DEG C by 110 DEG C; Hypomere is the sensible heat generation saturation steam that waste heat boiler absorbs water-gas;
E, water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enter scrubber tower to carry out cleaning, lowering the temperature, clean through scrubber tower, wash the dust of coal tar and the suspension of carrying secretly in water-gas, and make to carry secretly in water-gas do not have the water vapour decomposed to be cooled to water to enter cooling circulating water system and re-use, water-gas temperature≤45 DEG C after scrubber tower process;
Described water-gas after steps d UTILIZATION OF VESIDUAL HEAT IN enters scrubber tower to carry out cleaning, lowering the temperature, and wherein the water-gas process of cleaning in scrubber tower sprays backwash and the cleaning of tower top packing section in boiling washing, tower at the bottom of tower successively;
F, after the process of step e scrubber tower, obtain product water coal gas, products obtained therefrom water-gas is sent into gas holder for postorder; In products obtained therefrom water-gas, essential substance composition and content thereof are respectively: CO
212 ~ 17%, O
20.1 ~ 0.3%, CO 39 ~ 42%, H
240 ~ 44%, N
20.3 ~ 0.8% and CH
4≤ 1.0%.
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|---|---|---|---|
| CN201110447151.8A CN102559266B (en) | 2011-12-28 | 2011-12-28 | Method for producing water gas by pure oxygen continuous gasification in fixed bed |
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| CN201110447151.8A CN102559266B (en) | 2011-12-28 | 2011-12-28 | Method for producing water gas by pure oxygen continuous gasification in fixed bed |
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| CN102559266A CN102559266A (en) | 2012-07-11 |
| CN102559266B true CN102559266B (en) | 2015-03-18 |
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| CN103074110A (en) * | 2013-01-28 | 2013-05-01 | 柳州化工股份有限公司 | Production method of continuous semi-fluidized fixed bed semi-water gas |
| CN104789266A (en) * | 2015-03-23 | 2015-07-22 | 七台河宝泰隆煤化工股份有限公司 | Coal gas generating method |
| CN105368498A (en) * | 2015-09-08 | 2016-03-02 | 袁峥嵘 | Method for preparing water gas through pressurization continuous gasification of static beds |
| CN105802672A (en) * | 2016-05-30 | 2016-07-27 | 河南昌昱实业有限公司 | Method for production of 1.0-2.2MPa water gas by fixed bed gasification |
| CN107557074A (en) * | 2017-09-30 | 2018-01-09 | 广西信发铝电有限公司 | A kind of coal gas production method |
| CN107603677B (en) * | 2017-11-07 | 2020-11-20 | 山东京博众诚清洁能源有限公司 | Coal gas production equipment and safe blow-in method thereof |
| CN108300513B (en) * | 2018-01-18 | 2020-04-17 | 山东京博众诚清洁能源有限公司 | Production method for improving quality of fixed bed furnace gas |
| CN108998100A (en) * | 2018-09-17 | 2018-12-14 | 陕西黑猫焦化股份有限公司 | The energy-saving jacket boiler of pure oxygen gas making |
| CN109912389A (en) * | 2019-01-30 | 2019-06-21 | 浙江天禄环境科技有限公司 | A method of methanol is prepared using coal substance in low-order coal |
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| CN1092799A (en) * | 1993-03-23 | 1994-09-28 | 四川蜀华化工新技术开发有限公司 | Coal (Jiao) process for atmospheric continuous oxygen-enriched air gasification of coal (coke) |
| CN1156754A (en) * | 1996-12-30 | 1997-08-13 | 金群英 | Method for continuously gasifying coal (coke) and purifying synthesized gas |
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| CN1156754A (en) * | 1996-12-30 | 1997-08-13 | 金群英 | Method for continuously gasifying coal (coke) and purifying synthesized gas |
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