CN103374425A - Sludge pulverized coal and preparation method thereof - Google Patents
Sludge pulverized coal and preparation method thereof Download PDFInfo
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- CN103374425A CN103374425A CN2012102354247A CN201210235424A CN103374425A CN 103374425 A CN103374425 A CN 103374425A CN 2012102354247 A CN2012102354247 A CN 2012102354247A CN 201210235424 A CN201210235424 A CN 201210235424A CN 103374425 A CN103374425 A CN 103374425A
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Abstract
The invention provides sludge pulverized coal and a preparation method thereof, belonging to the field of gasification. The sludge pulverized coal contains watery sludge, coal and furnace clinker. The mass ratio of the watery sludge to the coal to the furnace clinker is (10-30):(40-85):(5-30). The sludge pulverized coal provided by the invention has the advantages of low water content, low heat energy loss in the gasification or combustion process and high gasification efficiency; and in addition, the furnace clinker is added to treat the watery sludge, so that the treatment cost is low, the efficient and rapid treatment on the sludge and the furnace clinker is realized, and the maximum utilization of resources is realized.
Description
Technical field
The present invention relates to a kind of mud coal dust and preparation method thereof, belong to the gasification field.
Background technology
How the huge and complicated component of the output of municipal sludge has become people institute problems of concern to municipal sludge disposal and utilization.For a long time, people always with the mud of " minimizing, stabilization, innoxious " as final purpose.Under this principle, people preferentially select the technology of better economy to come mud is disposed.At present, the treatment process of municipal sludge mainly contains landfill, is used for farming fertilizer, burning etc.
The advantage that the sanitary landfill method lignin-sludge has is simple to operate, investment is supported, but landfill yard landfill mud need to occupy and contain certain toxic substance in a large amount of soils and the mud, and the improper percolate that might cause of landfill oozes out the severe contamination groundwater resource.Along with the enhancing of human environmental consciousness, people are more and more higher to the requirement of urban environment, thereby it is also more and more higher that Sludge landfill is disposed requirement, and the range of choice in landfill place is more and more less, and the landfill cost is also more and more higher.
Mud refers to that as fertile utilization the in farmland mud can be used as after treatment fertilizer and is used for soil, because the content of organism, nitrogen, phosphorus etc. all is higher than general farmers' barnyard manure in the sludge components, also contain potassium and other trace element, if be applied in the soil, physics, chemistry and the biological character of soil there is certain improving effect.But contain a large amount of pathogenic micro-organisms and parasite in the sludge from wastewater treatment plant, as not controlled, then mud can work the mischief to people and animals' health in soil utilization or use procedure; Often there are on the other hand heavy metal and many toxic organic compounds such as a large amount of copper, nickel, cadmium, lead, zinc, mercury in the mud, if the farmland life-time service can cause soil pollution, they enter human body by food chain again after being absorbed by farm crop, thereby affect HUMAN HEALTH.Therefore, the dispute that causes of agricultural sludge is more and more.As France and German, the phenomenon of mud agricultural-food has appearred refusing to use in some areas.
Sludge incineration is as one of method of sludge disposal, and it can make the whole charings of organism in the mud, pathogen kill, to greatest extent reduce mud volume.But because sludge moisture content is large, need mummification before the burning, burning can not bring a large amount of heat energy incomes, invests on the contrary hugely, after the sludge incineration, produces easily the pollutents such as dioxin in addition, causes the secondary pollution of environment.
In order to solve the problems of the technologies described above, people have carried out continuous research to sludge disposal technology, have proposed mud and coal are mixed with sludge coal slurry, then sludge coal slurry are burnt or the method for gasification process.The method be a kind of can safe disposal mud and free from environmental pollution, and can produce heat energy or clean combustible gas and/or the refuse reclamation method of synthetic gas, meet the strategic objective of the Sustainable development of China.
In the prior art, Chinese patent literature CN1908134A discloses a kind of high concentration sludge coal slurry and preparation method thereof, described sludge coal slurry comprises 100 ~ 200 parts of coal dusts, 10 ~ 50 parts of water-containing sludges, 10 ~ 100 parts in water, 1 ~ 5 part of additive, 1 ~ 5 part of sludge modification medicament, wherein said additive are naphthalenesulfonate, polycarboxylate or sulfonated lignin.Sludge coal slurry described in the above-mentioned technology has been realized the recycling of mud as boiler oil or vaporising fuel, has preferably economic benefit.But in the above-mentioned technology, the additive in the sludge coal slurry keeps the stability of sludge coal slurry usually as the stablizer of slurry, and the cost that adds affiliation increase sludge coal slurry of these additives; Secondly, the water ratio in the sludge coal slurry is very high, is generally 75 ~ 95wt%, in the burning or gasification of sludge coal slurry, at first need the water in the sludge coal slurry is evaporated, and evaporation of water can cause the more energy of loss in the gasification, cause the energy consumption of sludge coal slurry gasification to increase; At last, when sludge coal slurry gasifies as gasified raw material, need to behind high pressure pumping and high pressure oxygen mixed aerosol, spray into the vapourizing furnace gasification, and sludge coal slurry when spraying into the nozzle to vapourizing furnace require very high, and when nozzle is worked under high pressure conditions for a long time, cause easily nozzle variant, reduced the work-ing life of gasifying furnace nozzle.
For above-mentioned technical problem, those skilled in the art are seeking a kind of method that can effectively realize ﹠ Mud always.Further study discovery through the contriver, if mud and coal are prepared into the mud coal dust, and then the mud coal dust gasified or burn, because the water ratio in the mud coal dust is very low, burn like this or when gasifying, can save the loss of heat energy in burning or the gasification, and the efficient of the thick combustion gas that obtains during gasification can improve greatly also.But because the organic composition that contains in the mud is more, removing fully in conjunction with water is difficult in the mud so in the process with the mud grinding flour, sludge dry powder is combined into bulk easily, is difficult to mud is made dry powder with coal
And had in the prior art drying sludge is prepared into the powder relevant report, for example Chinese patent CN102183027A provides a kind of method of disposal of high heating value excess sludge, comprise with pending water ratio being that the excess sludge of 80 ~ 90wt% is sent into filter press water machine and dewatered, the press filtration water ratio that obtains is the dewatered sludge cake of 45 ~ 55wt%, the mud cake that makes is sent into sludge pelletizer, be broken at normal temperatures the coarse particles of 3 ~ 5mm, mud granule is further mummification between the heat energy mummification, sending into mud through the mud granule after the mummification makes powder equipment and further processes, adopt air-flow high velocity impact technology, make a large amount of natural airs of inspiration in the powder equipment as medium take sludge dewatering, a large amount of interstitial waters dissociate from mud, appearance water, impel mud powder internal moisture to ooze out fast, the mud powder directly is that 150 orders ~ 300 orders (are 0.05mm ~ 0.15mm) after processing, water ratio is 5 ~ 15wt%, the sludge dry powder that obtains is sprayed in the sludge incinerator burn.
In the above-mentioned technology, by filter press and mud granulizing are set, and utilize between the heat energy mummification further dry to mud granule, then adopt air-flow high velocity impact technology to mud granule is made powder, obtaining particle diameter is that 150 orders ~ 300 orders (are that 0.05mm ~ 0.15mm), water ratio is the sludge dry powder of 5 ~ 15wt%.Although this technology can be controlled at the particle diameter of sludge dry powder less than 0.2mm, moisture control is at 5 ~ 15wt%, but this technology mainly realizes above-mentioned target by air-flow high velocity impact technology, and the speed that requires air-flow in the air-flow high velocity impact technology must surpass the velocity of sound, as everyone knows, if the generation supersonic flow is to need sizable energy, and the equipment cost that can produce supersonic flow is high, only utilize the stage in the laboratory at present, and for output big sludge treatment like this, its effect is extremely limited.
Present stage, China is big coal country, the basic fuel take coal as electrical production.The rate of increase of the annual power generation capacity in the whole nation is 7.3%, and this has just brought slag of the annual discharging of heat power plant sharply to increase, for example, nineteen ninety-five the slag emission amount reach 1.25 hundred million tons, be about 1.5 hundred million tons in 2000, reached 200,000,000 tons by 2010.In the metallurgical industry, the discharging of a large amount of slags is arranged also in addition.A large amount of dischargings of these slags cause huge pressure to the ecotope of China.And the china natural resources reserves are limited, and the refuse reclamation of slag has become important techno-economic policy in China's economic construction, are to solve China's electrical production environmental pollution, the important means of resource shortage contradiction.
At present, slag is mainly used in the fields such as building materials, electric power.Because slag generally is rock-like or glassy, hardness is high, and particle is pulverized difficult, if when directly using it for sludge modification or processed, have that the modification ability is weak, the problem of costs and poor dehydration results, so in the prior art, still slag is not directly used in the report of sludge modification and processed.
Summary of the invention
Technical problem to be solved by this invention is that the water ratio in the sludge coal slurry of the prior art is too high, it is burnt or when gasifying, cause easily burning or the energy consumption of gasification increases, and then provide a kind of through the mud coal dust slag modification, low-water-content and preparation method thereof.
In order to solve the problems of the technologies described above, the invention provides a kind of mud coal dust, described mud coal dust comprises following raw material, and described raw material is water-containing sludge, coal, slag.
Described mud coal particle size≤10mm.
The mass ratio of described water-containing sludge and described coal, described slag is (10 ~ 30): (40 ~ 85): (5 ~ 30).
Also comprise gac in the described mud coal dust.
The mass ratio of described gac and described water-containing sludge is (1 ~ 10): (90 ~ 99).
Described mud coal dust water ratio is lower than 10wt%.
Described slag be in coal furnace slag, coal gasifier slag, the metallurgical slag any one or multiple.
The invention provides a kind of method for preparing described mud coal dust, comprise the steps:
(1) adds the mixture of slag or slag and gac in the water-containing sludge, mix;
(2) in the mixed material of step (1), adding coal, mix, pulverize altogether mill or granulation, obtain the mud coal dust;
(3) to the mud coal dust that obtains in the described step (2) at 20 ~ 120 ℃ of lower dryings or natural air drying.
This present invention provides the method for the described mud coal dust of another kind of preparation, comprises the steps:
(1) adds the mixture of coal, slag or slag and gac in the water-containing sludge, mix, pulverize altogether mill or granulation, obtain the mud coal dust;
(2) to the mud coal dust that obtains in the described step (1) at 20 ~ 120 ℃ of lower dryings or natural air drying.
The present invention compared with prior art has following advantage:
(1) slag and coal have been added in the mud coal dust of the present invention, the collaborative promoter action of slag and coal can improve the effect to the water-containing sludge modification, make the irreducible water in the mud change more free water into, thereby reduce the viscosity of mud, and the reduction of mud viscosity is convenient to slag, coal Uniform Doped in mud; When pulverizing altogether mill or granulation, mutually mixing between slag and the coal has increased interaction force between the particle, and after the reactive force between the particle increased, the grinding of the slag that hardness is high when being conducive to pulverize common mill or granulation, particle diameter is large obtained the mud coal dust; Described mud coal dust is carried out drying or natural air drying again, obtain mud coal dust of the present invention.The slag that adds in the mud coal dust of the present invention in addition contains the metal oxides such as a large amount of CaO, FeO, MgO, MnO, and this quasi-metal oxides can directly be carried out the desulfurization processing to coal gasification course in vapourizing furnace, has reduced the content of the thick combustion gas medium sulphide content that generates; When described slag was selected coal firing boiler slag or coal gasifier slag, the carbonaceous material that does not have after-flame or gasification that its inside is contained can further burning or gasification in the burning of mud coal dust or gasification, thereby improved the transformation efficiency of carbon.Mud coal dust of the present invention utilizes the slag treatment water-containing sludge, and processing cost is cheap, has realized efficient, fast disposal to mud, slag, and has realized the maximum using of resource.Described mud coal dust firing or when gasification, have that water ratio is low, gasification or the combustion processes heat energy loss is low, gasification efficiency is a high advantage.
(2) can also add again gac in the mud coal dust of the present invention, on the one hand, the adding of gac can make the irreducible water in the water-containing sludge be converted into more free water, and free water is more volatile when pulverizing is total to mill or granulation, thereby reduces the water ratio in the mud coal dust; The larger slag of hardness was ground to the less pulverized slag of particle diameter when the adding of gac also helped the described mud coal dust of preparation on the other hand.This be because, be total in mill or the granulation process in pulverizing, gac is entrained between the compound particles, when interacting in common mill process between the variable grain, can increase the friction force between the particle, and the increase of friction force more is conducive to the high pulverized slag breakdown mill of hardness.
(3) sludge coal powder, preparation method thereof of the present invention, by in the process of preparation mud coal dust, adding slag and coal, and the mass ratio of controlling described water-containing sludge and described coal, described slag is (10 ~ 30): (40 ~ 85): (5 ~ 30), so that slag and coal have the performance of the best to the modification of water-containing sludge, so that the irreducible water in the mud changes free water more into, thereby change better the high viscosity of mud, when mud, coal, slag ground altogether, mud can not cohere because of the water ratio height of irreducible water; This is external when grinding altogether mixes between slag and the coal mutually, increased the interaction force between the particle when grinding altogether, and after the increase of the reactive force between the particle, the slag that hardness is high when more being conducive to common mill, particle diameter is large grinds, thereby obtains mud coal dust of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
Embodiment 1
To the 10kg water ratio be add the 85kg brown coal in 70% the water-containing sludge, the 5kg particle diameter is the coal furnace slag of 20mm, mix, altogether mill obtain particle diameter less than the water ratio of 0.2mm less than 10wt% mud coal dust; With described mud coal dust natural air drying to water ratio＜10wt%.
Embodiment 2
To the 15kg water ratio be add the 70kg brown coal in 75% the water-containing sludge, the 15kg particle diameter is the coal furnace slag of 15mm, mix, granulation obtain particle diameter less than the water ratio of 10mm less than 10wt% mud coal dust; With described mud coal dust dry 36h under 20 ℃, to water ratio＜10wt%.
Embodiment 3
To the 20kg water ratio be add the 60kg brown coal in 80% the water-containing sludge, the 20kg particle diameter is the coal furnace slag of 10mm, mix, granulation obtain particle diameter less than the water ratio of 10mm less than 10wt% mud coal dust; With described mud coal dust dry 24h under 60 ℃, to water ratio＜10wt%.
Embodiment 4
To the 25kg water ratio be add the 50kg brown coal in 85% the water-containing sludge, the 25kg particle diameter is the coal furnace slag of 7mm, mix, granulation obtain particle diameter less than the water ratio of 10mm less than 10wt% mud coal dust; With described mud coal dust dry 12h under 80 ℃, to water ratio＜10wt%.
Embodiment 5
To the 30kg water ratio be add the 40kg brown coal in 90% the water-containing sludge, the 30kg particle diameter is the coal furnace slag of 3mm, mixes, granulation obtains particle diameter less than the mud coal dust of 10mm; With described mud coal dust dry 0.5h under 120 ℃, to water ratio＜10wt%.
Embodiment 6
Be that bituminous coal, the 0.5kg particle diameter that adds 98.5kg in 90% the mud is 20mm coal furnace slag to the 1kg water ratio, mix, pulverize granulation and obtain particle diameter less than the mud coal dust of 10mm.
Embodiment 7
Be that to add 85kg brown coal, 5kg particle diameter in 95% the water-containing sludge be that coal furnace slag, the 0.101kg particle diameter of 20mm is the gac of 1.5mm to the 10kg water ratio, mix that pulverizing altogether, mill obtains particle diameter less than the mud coal dust of 0.2mm; With described mud coal dust natural air drying to water ratio＜10wt%.
Embodiment 8
Be that to add 60kg brown coal, 20kg particle diameter in 80% the water-containing sludge be that coal furnace slag, the 1.11kg particle diameter of 15mm is the gac of 0.05mm to the 20kg water ratio, mix, pulverize granulation and obtain particle diameter less than the mud coal dust of 10mm; With described mud coal dust dry 24h under 100 ℃, to water ratio＜10wt%.
Embodiment 9
Be that to add 40kg brown coal, 30kg particle diameter in 90% the water-containing sludge be that coal furnace slag, the 3.33kg particle diameter of 10mm is the gac of 3mm to the 30kg water ratio, mix that granulation obtains particle diameter less than the mud coal dust of 10mm; With described mud coal dust dry 0.5h under 120 ℃, to water ratio＜10wt%.
Embodiment 10
Be that to add the 5kg particle diameter in 70% the mud be the coal gasifier slag of 3mm to the 10kg water ratio, mix, then the hard coal that adds 85kg in the mixed material, mix rear granulation and obtain particle diameter less than the mud coal dust of 10mm, with described mud coal dust natural air drying to water ratio＜10wt%.
Embodiment 11
Be that to add the 15kg particle diameter in 75% the mud be the coal furnace slag of 7mm to the 15kg water ratio, mix, then the hard coal that adds 70kg in the mixed material, mix the rear particle diameter of powder that is milled to altogether less than 0.2mm, obtain the mud coal dust, descend dry 48h to water ratio＜10wt% at 20 ℃ described mud coal dust.
Embodiment 12
Be that to add the 10kg particle diameter in 80% the mud be the metallurgical slag of 5mm, the coal furnace slag that the 10kg particle diameter is 10mm to the 20kg water ratio, mix, then the coal that adds 60kg in the mixed material, after mixing, be milled to altogether the particle diameter of powder less than 0.2mm, obtain the mud coal dust, descend dry 24h to water ratio＜10wt% at 60 ℃ described mud coal dust.。
Embodiment 13
Be that to add the 25kg particle diameter in 85% the mud be the coal gasifier slag of 15mm to the 25kg water ratio, mix, then the brown coal that add 50kg in the mixed material, mix the rear particle diameter of powder that is milled to altogether less than 0.2mm, obtain the mud coal dust, descend dry 18h to water ratio＜10wt% at 100 ℃ described mud coal dust.。
Embodiment 14
Be that to add the 30kg particle diameter in 85% the mud be the coal gasifier slag of 15mm to the 30kg water ratio, mix, then the brown coal that add 40kg in the mixed material, mix the rear particle diameter of powder that is milled to altogether less than 0.2mm, obtain the mud coal dust, descend dry 0.5h to water ratio＜10wt% at 120 ℃ described mud coal dust.
Embodiment 15
Be that the 0.5kg particle diameter is 40mm coal furnace slag in 90% the mud to the 1kg water ratio, mix, then add the bituminous coal of 98.5kg in the mixed material, mix rear granulation and obtain water ratio＜10wt% particle diameter less than the mud coal dust of 10mm.
Embodiment 16
Be that to add the 2.5kg particle diameter in 80% the mud be the metallurgical slag of 8mm, the coal furnace slag that the 2.5kg particle diameter is 5mm to the 10kg water ratio, 0.101kg particle diameter is the gac of 0.05mm, mix, then the hard coal that adds 85kg in the mixed material, after mixing, mill obtains particle diameter less than the mud coal dust of 0.2mm altogether, with described mud coal dust dry 0.5h under 120 ℃, to water ratio＜10wt%.
Embodiment 17
Be that to add the 10kg particle diameter in 85% the mud be that the coal gasifier slag of 10mm, coal furnace slag, the 0.833kg particle diameter that the 10kg particle diameter is 10mm are the gac of 1.5mm to the 20kg water ratio, mix, then the brown coal that add 60kg in the mixed material, mix rear altogether mill and obtain particle diameter less than the mud coal dust of 0.2mm, with described mud coal dust dry 36h under 60 ℃, to water ratio＜10wt%.
Embodiment 18
Be that to add the 15kg particle diameter in 90% the mud be that the metallurgical slag of 13mm, coal furnace slag, the 2.258kg particle diameter that the 15kg particle diameter is 13mm are the gac of 3mm to the 30kg water ratio, mix, then the bituminous coal that adds 40kg in the mixed material, mix rear altogether mill altogether mill obtain particle diameter less than the mud coal dust of 0.2mm, with described mud coal dust at 20 ℃ of lower dry 48h to water ratio＜10wt%.。
Embodiment 19
Be that to add the 15kg particle diameter in 95% the mud be that coal gasifier slag, the 1.667kg particle diameter of 16mm is the gac of 3mm to the 15kg water ratio, mix, then the hard coal that adds 70kg in the mixed material, mix rear altogether mill altogether mill obtain particle diameter less than the mud coal dust of 0.2mm, with described mud coal dust at 100 ℃ of lower dry 24h to water ratio＜10wt%.
Test case 1
Get the mud coal dust for preparing among above-described embodiment 1, embodiment 7, embodiment 11, embodiment 12, embodiment 13, embodiment 14, embodiment 16, embodiment 17, embodiment 18, the embodiment 19 and in airflow bed gasification furnace, carry out respectively the gasification test test, wherein the operational condition of airflow bed gasification furnace is as follows: vapor pressure 2.45MPa, 1380 ℃ of gasification temperatures, enter stove mud coal dust amount (doing): 1.00 ~ 1.05t/h, oxygen/raw material is 0.58Nm3/kg, steam/oxygen gas is 0.21kg/Nm3, and described raw material is the mud coal dust.
Choose raw gas and lime-ash behind the entrained flow gasification, raw gas composition, efficiency of carbon conversion and cold gas efficiency are tested, test result is as shown in table 1, adopts ash fusion point determination meter to carry out ash melting mensuration to lime-ash, and measurement result is as follows.
The gasification index Measurement results of table 1 airflow bed gasification furnace
Adopt the ash fusion point determination meter lime-ash that powder airflow bed gasification produces afterwards to sludge coal to carry out ash melting mensuration, the result shows, the texturing temperature of lime-ash (DT) is that 1070 ~ 1120 ℃, softening temperature (ST) are that 1150 ~ 1190 ℃, yield temperature (FT) are 1220 ~ 1250 ℃ behind entrained flow gasification
Test case 2
Get the test of in fluidized-bed gasification furnace, gasifying respectively of mud coal dust that above-described embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 8, embodiment 9, embodiment 10, embodiment 15 prepare, wherein the operational condition of fluidized-bed gasification furnace is as follows: vapor pressure 0.098MPa, 1100 ℃ of gasification temperatures, enter stove mud coal dust amount (doing): 1.00 ~ 1.05t/h, oxygen/raw material is 0.58Nm3/kg, steam/oxygen gas is 0.21kg/Nm3, and described raw material is the mud coal dust.
Choose raw gas and lime-ash after the fluidized-bed gasification, raw gas composition, gas yield, gasification intensity, efficiency of carbon conversion and gasification efficiency are tested, test result is as shown in table 2; Adopt the ash fusion point tester to carry out the ash melting property testing to lime-ash, test result is as follows.
The gasification index Measurement results of table 2 fluidized-bed gasification furnace
The lime-ash that produces after adopting ash fusion point determination meter to the fluidized-bed gasification of mud coal dust carries out ash melting mensuration, the result shows, the texturing temperature of the lime-ash that forms after fluidized-bed gasification (DT) is that 970 ~ 990 ℃, softening temperature (ST) are that 1150 ~ 1190 ℃, yield temperature (FT) are 1220 ~ 1250 ℃.
By above-mentioned test result as can be known, mud coal dust of the present invention compared with prior art, has the advantage that the gasification heat energy loss is low, gasification efficiency is high; And by the lime-ash that produces behind the mud coal dust gasification being carried out ash melting mensuration; the result shows; the softening temperature of lime-ash all is higher than 1100 ℃; and the softening temperature of common lime-ash is below 1000 ℃; for example the lime-ash softening temperature of Lay mattress brown coal is 950 ℃; the alkalescence of slag of having utilized mud coal dust of the present invention and preparation method thereof form to improve the ash fusion point to 1100 ℃ of the lime-ash that gasification produces, and the raising of the ash fusion point lime-ash that produces of being convenient to gasify is discharged with solid-state form.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive, and the apparent variation of being extended out thus or the change still be among the protection domain of the invention claim.
Claims (9)
1. a mud coal dust is characterized in that, described mud coal dust comprises following raw material, and described raw material is water-containing sludge, coal, slag.
2. described mud coal dust according to claim 1 is characterized in that described mud coal particle size≤10mm.
3. described mud coal dust according to claim 1 and 2 is characterized in that the mass ratio of described water-containing sludge and described coal, described slag is (10 ~ 30): (40 ~ 85): (5 ~ 30).
4. according to claim 1 and 2 or 3 described mud coal dusts, it is characterized in that, also comprise gac in the described mud coal dust.
5. described mud coal dust according to claim 4 is characterized in that the mass ratio of described gac and described water-containing sludge is (1 ~ 10): (90 ~ 99).
6. arbitrary described mud coal dust is characterized in that according to claim 1 ~ 5, and described mud coal dust water ratio is lower than 10wt%.
7. arbitrary described mud coal dust is characterized in that according to claim 1 ~ 6, described slag be in coal furnace slag, coal gasifier slag, the metallurgical slag any one or multiple.
8. a method for preparing the arbitrary described mud coal dust of claim 1 ~ 7 comprises the steps:
(1) adds the mixture of slag or slag and gac in the water-containing sludge, mix;
(2) in the mixed material of step (1), adding coal, mix, pulverize altogether mill or granulation, obtain the mud coal dust;
(3) to the mud coal dust that obtains in the described step (2) at 20 ~ 120 ℃ of lower dryings or natural air drying.
9. a method for preparing the arbitrary described mud coal dust of claim 1 ~ 7 comprises the steps:
(1) add the mixture of coal, slag or slag and gac in the water-containing sludge, mix, mill or granulation obtain the mud coal dust altogether;
(2) to the mud coal dust that obtains in the described step (1) at 20 ~ 120 ℃ of lower dryings or natural air drying.
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| CN103710064A (en) * | 2013-12-18 | 2014-04-09 | 华中科技大学 | Sludge-lignite molded fuel and preparation method thereof |
| CN103710064B (en) * | 2013-12-18 | 2015-05-20 | 华中科技大学 | Sludge-lignite molded fuel and preparation method thereof |
| CN108644788A (en) * | 2018-05-22 | 2018-10-12 | 华中科技大学 | A kind of oxygenation combustion method of coal dust blending sludge |
| CN108679599A (en) * | 2018-05-22 | 2018-10-19 | 华中科技大学 | A kind of oxygenation combustion method of coal dust blending biomass |
| CN108644788B (en) * | 2018-05-22 | 2020-05-19 | 华中科技大学 | Oxygen-enriched combustion method for coal powder mixed with sludge |
| CN108679599B (en) * | 2018-05-22 | 2020-06-26 | 华中科技大学 | Oxygen-enriched combustion method for mixing pulverized coal with biomass |
| CN109504485A (en) * | 2018-11-07 | 2019-03-22 | 辽宁大唐国际阜新煤制天然气有限责任公司 | Utilize the solid fuel and its preparation method and application of sewage plant sludge preparation |
| CN109999719A (en) * | 2019-04-26 | 2019-07-12 | 沈阳航空航天大学 | A kind of rotary kiln type sludge coal dust Granulation Equipments |
| CN111548098A (en) * | 2020-06-12 | 2020-08-18 | 北京土木禾天环保科技有限公司 | Road base layer mixture made from coal gasification waste residue and manufacturing method thereof |
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