CN103282469B - The gasification system of the manufacture method of low-grade coal slurry, the manufacturing installation of low-grade coal slurry and low grade coal - Google Patents
The gasification system of the manufacture method of low-grade coal slurry, the manufacturing installation of low-grade coal slurry and low grade coal Download PDFInfo
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- CN103282469B CN103282469B CN201280005349.3A CN201280005349A CN103282469B CN 103282469 B CN103282469 B CN 103282469B CN 201280005349 A CN201280005349 A CN 201280005349A CN 103282469 B CN103282469 B CN 103282469B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
- C10J3/506—Fuel charging devices for entrained flow gasifiers
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0906—Physical processes, e.g. shredding, comminuting, chopping, sorting
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0909—Drying
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/094—Char
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Abstract
The object of the present invention is to provide and be suitable for according to the high concentration of slurry of the gasification of pressurized-gasification furnace and the simple preparation process of low viscous low-grade coal slurry and manufacturing installation and possess the gasification system of such manufacturing installation.The manufacture method of low-grade coal slurry of the present invention has: first operation of at high temperature under high pressure low grade coal after coarse reduction being carried out to modification; Water and dispersion agent is added, by second operation of wet pulverization method by low-grade coal slurry with in the low grade coal after modification.Again, the manufacturing installation of low-grade coal slurry of the present invention has: dry ground device low grade coal being carried out to dry ground; Low grade coal after dry ground is carried out to the high-temp and-pressure kneading device of modification; With add the water and dispersion agent of being discharged from low grade coal by modification, by the wet pulverization device of the low-grade coal slurry after modification.
Description
Technical field
The present invention relates to the method and apparatus being suitable for the slurries of the fuel of pressurized-gasification furnace for the low grade coal manufacture such with brown coal.Again, the present invention relates to the gasification system possessed with the low grade coal of such slurries pressurized-gasification furnace that is fuel.
Background technology
In recent years, the consumption of worldwide energy resource expands and advances just rapidly, and the price as the oil of main energy sources, coal or Sweet natural gas etc. constantly rises.Therefore, these energy how are effectively used to become major issue.
As the coal that general fuel uses, except generating efficiency and cost, also from conveying or the angle consideration of preserving the secure context such logistics, use the pitch coal of golf calorific value.But along with the economic growth of emerging nation, the supply and demand of pitch coal worldwide go short of.
On the other hand, the reserve of the low grade coal calculated headed by brown coal, secondary brown coal or secondary pitch coal is the scale of the reserve more than 6,000 hundred million tons exceeding the such high grade coal of pitch coal.But low grade coal is high due to water ratio, when therefore it can be used as the fuel of boiler for power generation etc., thermo-efficiency is low, thus cost of electricity-generating uprises.Again, because brown coal reactivity is high, and when making it dry, the danger of spontaneous combustion uprises, and therefore conveying and storage difficulties, be not almost utilized at present.
Again, coal generates electricity the carbonic acid gas (CO caused
2) output be in the trend of global sharp increase, it becomes the important factor causing global greenhouse effect.Due to the CO of the per unit thermal value of coal
2output than oil or Sweet natural gas many, therefore reduction CO
2while the requirement of output is surging, the developed country headed by Japan is suppressing the use of coal.
The such low grade coal of brown coal is the promising fuel source that price is very cheap, reserve is also many, but due to problem as described above, practical situation are that it is not used effectively.Therefore, about near colliery by brown coal hydrogasification, and utilize the method for synthesis gas obtained, carry on technical development." synthesis gas " refer to coal or the such hydrocarbon polymer of Sweet natural gas for raw material and manufacture containing hydrogen (H
2) and carbon monoxide (CO), carbonic acid gas (CO
2) or the raw gas of methane etc., be the general name of the unstripped gas for ammonia synthesis, methanol-fueled CLC or hydrogen manufacture etc.
Particularly, near colliery, low grade coal such for brown coal is gasified, Separation and Recovery CO from the synthesis gas generated
2after, as without CO
2synthesis gas utilize method receive much concern.Such as, by brown coal hydrogasification, separation and purification hydrogen from the synthesis gas obtained, carries its post liquefaction as liquid hydrogen, and the method for fuel utilization as internal combustion turbine or gas engine, can predict that it will realize in the hydrogen society in future.
About the technology using coal gasification furnace to gasify to pitch coal, wet pulverization pitch coal and being liquefied by its water slurry, blows oxygen-blown gasifier for the wet method of the pitch coal of supply water slurry liquefaction while oxygen supply and operates as business machine in the vapourizing furnace run under High Temperature High Pressure.Again, the broken pitch coal of fine powder, with gas delivery coal dust and the method being supplied to vapourizing furnace also operate as business machine.
Use pressurized-gasification furnace when gasifying to pitch coal, if add water and the such additive of dispersion agent in pitch coal after being pulverized and make pitch coal become slurries, then to operate and conveying becomes easy.Again, because the price of per unit heat is low compared with heavy oil etc., therefore the fuel of oil receives much concern as an alternative.
When being supplied as slurries to pressurized-gasification furnace by coal, Low Viscosity Ratio is easier to operation and conveying, but during concentration of slurry (coal concentration) step-down, Energy efficiency declines.Particularly, when the low grade coal that brown coal are such, higher than the water ratio of pitch coal due to it, when therefore concentration of slurry reduces, Energy efficiency significantly declines.Therefore, high density is being sought and the manufacture method of low viscous low-grade coal slurry.
At this, patent documentation 1 discloses a kind of method, namely use low grade coal as feed coal, under the preferred apparent viscosity of about 1000cP, for the purpose of the slurries of the containing ratio obtaining coal as far as possible high (about 70 % by weight), two stages are divided into by mixing when mixing dewatered cake, water and dispersion agent, do not add dispersion agent in the first phase or carry out mixing with filter cake and water after a small amount of interpolation dispersion agent under immobilising degree, add dispersion agent when mixing thing becomes pasty state and carry out mixing further.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 11-335680 publication.
Summary of the invention
The problem that invention will solve
Brown coal also reach 30 ~ 70% due to water ratio, thus when adding water further and making its water slurry liquefy, total moisture (moisture in brown coal contained by inside and the summation as the moisture of the brown coal outside of the dispersion medium of slurries) in slurries becomes high, heats a large amount of in pressurized-gasification furnace is consumed because moisture evaporates, thus Energy efficiency becomes extremely low.Therefore, low grade coal water slurry such for brown coal high for water ratio is liquefied, is supplied to the method for carrying out in pressurized-gasification furnace gasifying, almost never studied in the past.
Fig. 2 is the outline process picture sheet of the manufacture method of slurries disclosed in patent documentation 1.Even if pulp manufacturing processes disclosed in patent documentation 1 adopts high-hygroscopicity and water ratio high (30 ~ 70 % by weight) and surface is hydrophilic brown coal or secondary pitch coal, also high density slurries can be manufactured.
In patent documentation 1(claim 3) disclosed in pulp manufacturing processes in, in the first operation (pulverizing process), in brown coal or secondary pitch coal, add water, by wet method crude pulverize prepare lower concentration slurries (10 ~ 40 % by weight).But the incomplete situation of water resource infrastructure is more near colliery, can predicts and guarantee that a large amount of water is very difficult.
Secondly, in the second operation (modified process), carried out the slurries of modification by hot-water cure (pressure be 12 ~ 15MPa, temperature be 250 ~ 330 DEG C), carry out dewatering in the 3rd operation (dehydration procedure) and become dewatered cake.But, because dewatered cake does not have mobility, thus its operation and difficulty of transportation.Then after the 4th operation (the first compounding procedure) mixing dewatered cake, it is again slurried, but owing to becoming the mashed prod not having mobility, thus its operation and conveying become difficulty.Again, in mixing, cannot expect brown coal etc. to be carried out fine powder broken.
In addition, in the 5th operation (the second compounding procedure), add dispersion agent and preparation aqueous slurry, but be difficult to dispersion agent to disperse equably in mixing.
The object of the present invention is to provide and be suitable for according to the high concentration of slurry of the gasification of pressurized-gasification furnace and the simple preparation process of low viscous low-grade coal slurry.
The means of dealing with problems
The present inventor is intently studied to solve the above-mentioned conventional art problem manufacturing low-grade coal slurry.Consequently, find it is not add water to the low grade coal after pulverizing it is slurried from outside, but by carrying out modification to low grade coal at high temperature under high pressure, and discharge the water that low grade coal comprises, thus the moisture that can reduce contained by low grade coal inside, and increase the moisture as the low grade coal outside of dispersion medium.Again, found by so operation, though when using low grade coal as feed coal, the total moisture in slurries is also identical with conventional art, and can obtain low viscosity and operation and conveying are easy to slurries, thus completes the present invention.
Specifically, the present invention relates to and have: first operation of at high temperature under high pressure low grade coal after coarse reduction being carried out to modification; With in the low grade coal after modification, be added on the water and dispersion agent of discharging from low grade coal in the first operation, by the manufacture method of wet pulverization by the low-grade coal slurry of the second operation of low-grade coal slurry.
In the first operation, discharge the water contained by low grade coal inside after coarse reduction, thus dry low grade coal.Again, because tar ingredients blocks the fine structure on low grade coal surface, therefore, it is possible to prevent the water of discharging from again being absorbed by low grade coal.
At this, low grade coal refers to brown coal, secondary pitch coal, secondary brown coal or their Mixture Density Networks, but preferably the present invention is specially adapted to brown coal.
In the second operation, after low grade coal after wet pulverization modification, it is slurried, but utilize after being recovered in the water (self discharges water) of discharging from low grade coal in the first operation, even near the colliery that water resources is less, also can prepare low-grade coal slurry.
Preferably, the modification of described first operation is more than 0.5MPa below 8MPa and temperature is carried out under being the condition of more than 100 DEG C less than 400 DEG C at pressure.
Preferably, the water ratio of the low grade coal after described first operation is less than 20 % by weight.The water ratio of the low grade coal herein addressed refers to that the moisture weight contained by low grade coal inside accounts for the per-cent of low grade coal gross weight.
Preferably, the concentration of slurry in described second operation is less than more than 40 % by weight 65 % by weight.The concentration of slurry herein addressed refers to the weight percent that the dry coal base (weight after moisture content being converted as 0 % by weight, i.e. dry base (drybasis)) of low grade coal contained in slurries calculates.
Preferably, the manufacture method of described low-grade coal slurry has after described second operation, the slurries obtained is carried out further to the 3rd operation of high-speed stirring process.By carrying out high-speed stirring process, the stability of slurries increases, thus also can preserve before slurries are supplied to pressurized-gasification furnace.
Preferably, described dispersion agent is polystyrene type dispersion agent, naphthene sulfonic acid class dispersion agent, methacrylic dispersion agent or sulfomethylated lignin acids dispersion agent, and the addition added to slurries is less than more than 0.2 % by weight 2 % by weight of the dry weight relative to low grade coal.
Again, the present invention relates to and have: the high-temp and-pressure kneading device low grade coal after dry ground being carried out to modification; With in the low grade coal after modification, add the water and dispersion agent of being discharged from low grade coal by modification, by the manufacturing installation of the low-grade coal slurry of the wet pulverization device of low-grade coal slurry.
Preferably, the manufacturing installation of low-grade coal slurry of the present invention also possesses dry ground device low grade coal being carried out to coarse reduction.
Preferably, the manufacturing installation of low-grade coal slurry of the present invention has the whipping appts slurries obtained by described wet pulverization device being carried out further to high-speed stirring process.
Again, the present invention relates to and have: the manufacturing installation of described low-grade coal slurry; To the conveying pipe arrangement that the slurries obtained from described wet pulverization device or described whipping appts are carried; And the gasification system to the low grade coal of pressurized-gasification furnace that the slurries by the conveying of conveying pipe arrangement gasify.
Above-mentioned purpose of the present invention, other objects, feature and advantage, with reference on the basis of accompanying drawing, can be able to clear and definite from the detailed description of following preferred example.
Invention effect
According to the present invention, the high concentration of slurry and low viscous low-grade coal slurry that are suitable for according to the gasification of pressurized-gasification furnace can be manufactured simply.Again, low grade coal that also can be such to the brown coal be not almost used effectively in the past, uses pressurized-gasification furnace to gasify expeditiously.
Accompanying drawing explanation
Fig. 1 is the summary construction diagram of an example of the device of the manufacture method illustrated for implementing low-grade coal slurry of the present invention;
Fig. 2 is the outline process picture sheet of the manufacture method of low-grade coal slurry disclosed in patent documentation 1.
Embodiment
Below, the present invention is explained.In addition, the invention is not restricted to following record.
Fig. 1 is the summary construction diagram of an example of the device of the manufacture method illustrated for implementing low-grade coal slurry of the present invention.First, low grade coal is by dry ground device 1 coarse reduction.Now, preferably, low grade coal is more than 70 % by weight by the particle (being the particle of the sieve of 3mm by mesh size) of coarse reduction to be granularity be below 3mm, and preferably granularity is the particle of below 3mm is more than 90 % by weight.
Then, the low grade coal after coarse reduction is supplied to high-temp and-pressure kneading device 2, carries out modification by means of heating and pressurization.Now, also as required a small amount of water can be supplied to high-temp and-pressure kneading device together with low grade coal, preferably, low grade coal amount in adjustment high-temp and-pressure kneading device 2 and the ratio of water, more than 80 % by weight are calculated as with wet coal-based (weight (moisture content 30 ~ 70 % by weight) of the low grade coal after coarse reduction itself, i.e. wet basis (wetbasis)) to make low grade coal.
As high-temp and-pressure kneading device 2, such as, high-temperature pressurizing type batch-type both arms mixing roll or high-temperature pressurizing type continous way both arms mixing roll can be used.Preferably, modification condition is pressure is more than 0.5MPa below 8MPa, temperature is more than 100 DEG C less than 400 DEG C.Mixing by means of carrying out under such pressure and temperature condition, granularity is almost constant, but the moisture contained by low grade coal inside is externally discharged (non-evaporating dehydrolysis).Consequently, low grade coal non-evaporating dehydrolysis to moisture content is less than 20 % by weight.Again, because the fine structure on coking coal component blocks low grade coal surface, surface hydrophilicity functional group become hydrophobic functional groups etc., the moisture after discharge becomes and is difficult to again be absorbed by low grade coal, thus the hydrophobicity on low grade coal surface also increases.
Vibratory screening apparatus 4 is supplied to the low grade coal after high-temp and-pressure kneading device 2 carries out modification.Now, preferably, the moisture contained by low grade coal inside is less than 20 % by weight.By vibratory screening apparatus 4, the part of moisture being separated low grade coal and discharging from low grade coal.A part for the moisture of discharging from low grade coal is recovered in vibratory screening apparatus 4 usually used as hot water, but when modification temperature is higher, also can be recovered as water vapour from high-temp and-pressure kneading device 2.
In addition, vibratory screening apparatus 4 is arbitrary structures, is removed under such circumstances at the moisture of discharging from low grade coal from high-temp and-pressure kneading device 2 as water vapour, does not need vibratory screening apparatus 4.In this case, water vapour reclaims as draining after being cooled.
All or part of being separated the low grade coal after moisture and the water (recycle-water) reclaimed with vibratory screening apparatus 4 is supplied to wet pulverization device 5 together with dispersion agent.Then, by the broken low grade coal of wet pulverization device 5 fine powder, thus preparation low-grade coal slurry.As wet pulverization device 5, such as, ball mill by wet process or medium stirring-type pulverizer can be used.In addition, remaining recycle-water, can discard, and also may be used for any other purposes.
The water yield being supplied to wet pulverization device 5 regulates according to the degree of dehydration in vibratory screening apparatus 4, preferably, low-grade coal slurry concentration adjustment is extremely calculated as the concentration of the scope of 40 ~ 65 % by weight with dry coal base (drybasis).When only use recycle-water and water shortage, add the water of aequum with additive method.Again, preferably, the broken low-grade coal slurry of fine powder is that the low grade coal particle (by 200 object low grade coal particles) of less than 74 μm accounts for 30 ~ 90% of low grade coal particle entirety to make particle diameter.
As dispersion agent, polystyrene type dispersion agent, naphthene sulfonic acid class dispersion agent, methacrylic dispersion agent or sulfomethylated lignin acids dispersion agent can be used.Preferably, add dispersion agent, to make its concentration in low-grade coal slurry be less than more than 0.2 % by weight 2 % by weight of the dry weight relative to the low grade coal contained in low-grade coal slurry.
Except dispersion agent, by adding the such stablizer of carboxymethyl cellulose and/or the such thickening material of xanthan gum in low-grade coal slurry, also can improve the stability of slurries further.Preferably, regulating stabilizer or thickening material, to make its concentration in low-grade coal slurry be 0.001 ~ 0.05 % by weight.
By the low-grade coal slurry that the present invention obtains, even if its total moisture is identical with low-grade coal slurry in the past, but moisture contained by low grade coal inside is less, and the amount as the water of dispersion medium is more.Therefore, be in a ratio of high density and low viscosity with low-grade coal slurry in the past, there is the physical properties of the gasification be suitable for according to pressurized-gasification furnace.
In the present invention, when carrying out slurried after the low grade coal after mixing water and coarse reduction, owing to also adding dispersion agent simultaneously, therefore different from the method disclosed in patent documentation 1, dispersion agent can be scattered in slurries equably.
As patent documentation 1, when wet pulverization lower concentration slurries, form the size-grade distribution that micropartical is less.In contrast, in the present invention, due to the Di grade Mei – water mixture that wet pulverization concentration is very high, the low grade coal therefore after wet pulverization forms the more desirable size-grade distribution of micropartical.
The low-grade coal slurry obtained by wet pulverization device 5 is stored in slurry tank 6.Preferably, the low-grade coal slurry in slurry tank 6 is in advance by stirrer 7(low-speed mixer) stir.Thereafter, by possessing the conveying pipe arrangement 9 of conveying pump 8, this low-grade coal slurry is supplied to whipping appts 10 from slurry tank 6.By using whipping appts 10(homogenizer) high-speed stirring process is carried out to low-grade coal slurry, the stability of low-grade coal slurry can be increased, thus low grade coal can be prevented to be separated.
As whipping appts 10, the tempering tank of line mixer (linemixer) or band homogenizer can be used.When using line mixer, preferably rotating speed is 500 ~ 5000rpm, and the residence time of low-grade coal slurry is 10 seconds ~ 2 minutes.Low-grade coal slurry (finished product slurries) after high-speed stirring process, by possessing the conveying pipe arrangement 13 of conveying pump 12, is supplied to pressurized-gasification furnace.
In addition, whipping appts 10 is arbitrary structures, when the low-grade coal slurry in slurry tank 6 being supplied to immediately pressurized-gasification furnace and being such, also can not arrange whipping appts.Now, low-grade coal slurry, by conveying pipe arrangement 9, is supplied to pressurized-gasification furnace from slurry tank 6.
Be supplied to the low-grade coal slurry of pressurized-gasification furnace (the coal pressurized-gasification furnace of wet method coal-supply way), be vaporized at this place, be transformed to synthesis gas.The synthesis gas obtained is separation of C O or CO as required
2such impurity, refines as hydrogen.Preferably, to the CO after separation
2being fixed.Again, preferably, the CO after separation is oxidized to CO
2afterwards to its being fixed.Like this, the system will gasified in pressurized-gasification furnace as the low grade coal of raw material is formed.
[embodiment]
(the first operation)
Use the brown coal of the proterties shown in jaw crusher his-and-hers watches 1 (brown coal (LoyYang brown coal) are produced in Australia) to carry out coarse reduction, the particle being below 3mm to make granularity be more than 90 % by weight the particle of the sieve of 3mm (be by mesh size be more than 90 % by weight of brown coal entirety).Add water in brown coal after coarse reduction, form the He Mei – water mixture that brown coal are 95 % by weight.This mixture of 10kg is fed into the high-temp and-pressure batch-type mixing roll that the volume possessing the mixing wing of Dual-arm is about 20L.
[table 1]
。
Pressure be 5.0MPa, under temperature is the condition of 280 DEG C, mixing He Mei – water mixture one hour, makes brown coal non-evaporating dehydrolysis and has carried out modification.After modification, the He Mei – water mixture (mixing thing) becoming pasty state is taken out from high-temp and-pressure batch-type mixing roll.Due to the evaporation etc. of moisture and the loss caused, the total moisture of the mixing thing of generation is 56.0 % by weight.Again, the inherent moisture (moisture contained by brown coal) of the dehydration brown coal in mixing thing is 18 % by weight.
Then, the mixing thing of 3kg is supplied in vibratory screening apparatus, is separated moisture.The total moisture of the mixing thing after moisture is separated is 36.0 % by weight.In mixing thing after moisture is separated, after adding recycle-water and polystyrene type dispersion agent further, be fed into ball mill by wet process (φ 300mm × L300mm, volume are about 21L).Regulate the addition of recycle-water, be calculated as 57 % by weight to make the brown coal concentration of mixing thing entirety with dry base.Again, add relative to brown coal (dry coal base) 0.6 % by weight polystyrene type dispersion agent.
(the second operation)
Batch-type pulverizing is carried out to the mixing thing, water and the dispersion agent that are fed in ball mill by wet process, obtain by 200 object brown coal be brown coal entirety 75 % by weight brown coal slurries.The concentration of these brown coal slurries is calculated as 57 % by weight with dry coal base, and apparent viscosity is 100sec in velocity of shear
-1, temperature is for 1.3Pas(1300cP under the condition of 25 DEG C).Again, by these brown coal slurries in the polythene container that internal volume is 500mL in left at room temperature (room temperature) after 7 days, brown coal sinkability is about 7 capacity %.
(the 3rd operation)
(Spectrum Lai Mikesi Co., Ltd. (PRIMIXCorporation) manufactures to use homogenizer further to the brown coal slurries of obtain 57 % by weight in above-mentioned second operation, T.KHOMOMIXERMARK II 2.5 type), with 1000rpm high-speed stirring process one minute.The apparent viscosity of the brown coal slurries after high-speed stirring process is 100sec in velocity of shear
-1, temperature is for 1.1Pas(1100cP under the condition of 25 DEG C).By the brown coal slurries after high-speed stirring process in the polythene container that internal volume is 500mL in left at room temperature (room temperature) after 7 days, brown coal sinkability is about 2 capacity %.Like this, the brown coal slurries confirming to obtain in the second operation are by carrying out high-speed stirring process further, and stability increases.
According to the above description, to those skilled in the art, many improvement of the present invention and other examples are apparent.Therefore, above-mentioned explanation is explained as just example, and provides to instruct to those skilled in the art for the purpose of enforcement most preferred form of the present invention.Without departing from the spirit of the present invention, the particular content of its structure and/or function can have material alteration.
Industrial applicability
The gasification system of the manufacture method of low-grade coal slurry of the present invention, the manufacturing installation of low-grade coal slurry and low grade coal is useful at fuel or energy field.
Nomenclature
1: dry ground device;
2: high-temp and-pressure kneading device;
3,11: motor;
4: vibratory screening apparatus;
5: wet pulverization device;
6: slurry tank;
7: stirrer (low-speed mixer);
8,12: conveying pump;
9,13: conveying pipe arrangement;
10: whipping appts (homogenizer).
Claims (10)
1. a manufacture method for low-grade coal slurry, is characterized in that, the manufacture method of described low-grade coal slurry has:
Coarse reduction low grade coal is the operation of more than 70 % by weight with the particle making particle diameter be below 3mm;
Low grade coal after coarse reduction is carried out to the first operation of modification under pressure is more than 0.5MPa below 8MPa and temperature is the condition of more than 100 DEG C less than 400 DEG C; With
In low grade coal after modification, be added on the water and dispersion agent of discharging from low grade coal in the first operation, by second operation of wet pulverization by low-grade coal slurry;
Described modification is the modification that tar ingredients blocks the fine structure on low grade coal surface.
2. the manufacture method of low-grade coal slurry according to claim 1, is characterized in that, the water ratio of the low grade coal after described first operation is less than 20 % by weight.
3. the manufacture method of low-grade coal slurry according to claim 1, is characterized in that, the concentration of slurry in described second operation is less than more than 40 % by weight 65 % by weight.
4. the manufacture method of low-grade coal slurry according to claim 1, is characterized in that,
Described dispersion agent is polystyrene type dispersion agent, naphthene sulfonic acid class dispersion agent, methacrylic dispersion agent or sulfomethylated lignin acids dispersion agent,
Described dispersion agent is less than more than 0.2 % by weight 2 % by weight of the dry weight relative to low grade coal to the addition that slurries add.
5. the manufacture method of low-grade coal slurry according to claim 1, is characterized in that, the manufacture method of described low-grade coal slurry has after described second operation, the slurries obtained is carried out to the 3rd operation of high-speed stirring process.
6. a manufacturing installation for low-grade coal slurry, is characterized in that, the manufacturing installation of described low-grade coal slurry has:
Coarse reduction low grade coal is the crude grinding device of more than 70 % by weight with the particle making particle diameter be below 3mm;
Low grade coal after coarse reduction is carried out to the high-temp and-pressure kneading device of modification; With
In low grade coal after modification, add the water and dispersion agent of being discharged from low grade coal by modification, by the wet pulverization device of low-grade coal slurry;
Described modification is the modification that tar ingredients blocks the fine structure on low grade coal surface.
7. the manufacturing installation of low-grade coal slurry according to claim 6, is characterized in that, the manufacturing installation of described low-grade coal slurry also possesses dry ground device low grade coal being carried out to coarse reduction.
8. the manufacturing installation of low-grade coal slurry according to claim 6, is characterized in that, the manufacturing installation of described low-grade coal slurry has the whipping appts slurries obtained by described wet pulverization device being carried out further to high-speed stirring process.
9. a gasification system for low grade coal, is characterized in that, the gasification system of described low grade coal has:
The manufacturing installation of low-grade coal slurry according to claim 6;
To the conveying pipe arrangement that the slurries obtained from described wet pulverization device are carried; And
To the pressurized-gasification furnace that the slurries by the conveying of conveying pipe arrangement gasify.
10. a gasification system for low grade coal, is characterized in that, the gasification system of described low grade coal has:
The manufacturing installation of low-grade coal slurry according to claim 8;
To the conveying pipe arrangement that the slurries obtained from described whipping appts are carried; And
To the pressurized-gasification furnace that the slurries by the conveying of conveying pipe arrangement gasify.
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| JP2011-012153 | 2011-01-24 | ||
| JP2011012153A JP6134087B2 (en) | 2011-01-24 | 2011-01-24 | Gasification method for low-grade coal slurry and gasification system for low-grade coal |
| PCT/JP2012/000102 WO2012101963A1 (en) | 2011-01-24 | 2012-01-11 | Low-grade coal slurry production method, low-grade coal slurry production device, and low-grade coal gasification system |
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| CN103282469A CN103282469A (en) | 2013-09-04 |
| CN103282469B true CN103282469B (en) | 2015-11-25 |
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| JP (1) | JP6134087B2 (en) |
| CN (1) | CN103282469B (en) |
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| US9404055B2 (en) | 2013-01-31 | 2016-08-02 | General Electric Company | System and method for the preparation of coal water slurries |
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| JP2012153760A (en) | 2012-08-16 |
| WO2012101963A1 (en) | 2012-08-02 |
| AU2012210130A1 (en) | 2013-06-27 |
| JP6134087B2 (en) | 2017-05-24 |
| CN103282469A (en) | 2013-09-04 |
| AU2012210130B2 (en) | 2015-10-29 |
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