CN101986070A - Solid thermal carrier drying method for hydrophilic bulk materials such as sludge and lignite - Google Patents
Solid thermal carrier drying method for hydrophilic bulk materials such as sludge and lignite Download PDFInfo
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The invention discloses a solid thermal carrier drying method, and belongs to thermal drying, namely water content in hydrophilic bulk materials such as sludge and lignite is removed through heat of solid thermal carriers. In the prior art, the thermal carriers are mainly gas thermal carriers, and individually liquid thermal carriers, and most terminal carriers adopt an indirect heat transfer mode, so the heat transfer rate is low, the thermal efficiency is low, the structure is complicated, the volume strength is low, the fixed investment is high and the operating cost is high. The solid thermal carrier drying method is characterized in that: fuel combustion heat is directly transferred to the solid thermal carriers; and the solid thermal carriers directly transfer the heat to materials to be dried, so the heat transfer efficiency is highest, the structure is simpler, the plot ratio of drying equipment is high, the equipment investment is low, the volume of discharged tail gas is smallest, the treatment difficulty is low, odorous noncondensable gas and air are directly burned to save energy and protect environment, and the operating cost is low.
Description
Technical field
The invention belongs to a kind of heating power drying, the heat of employing solid thermal carriers removes the moisture in the diffusing material of hydrophilics such as mud, brown coal.
Background technology
The diffusing material of high humidity hydrophilic has natural product, as brown coal, peat; Human finished product, intermediate product, byproduct or the discarded object that produces in activity in production also arranged.Finished product such as PTA, white carbon, titanium dioxide, barium sulfate, EDTA sodium salt etc., intermediate product such as CTA, intermediate etc., byproduct or discarded object, as the wet mud of city and trade effluent treatment plant, the coal slime that the coal washing process produces, Slag in the mining industry contains vinasse in cobalt waste slurry, the food industry, residue of soya, acid-sludge, pomace, bone base feed, biological slag mud etc. in the PTA production process.
The common feature of this class material is: moisture height (have up to more than 95%), because hydrophilic, adopt existing filtration operation can not reach the moisture content of technological requirement, and could be up to standard through super-dry; The dried thing that contains admittedly mostly is Powdered.
The sludge components that the municipal sewage plant produces is its complexity urgently, contains various organic and inorganic compounds, multiple microorganism, mushroom, and the gas of discharge and condensate liquid often have foreign odor, could discharge through after the harmless treatment.In addition because: the characteristic of (1) mud is very sticking, and a special gluing phase stage is arranged in dry run, gives dry and sterilization brings very big difficulty; (2) drying process and mud are formed, and the direction of utilizing of dewatered sludge has very big De Guan Department, cause mud to become the diffusing material of the most unmanageable a kind of hydrophilic.
Mud is a kind of hydrophilic substance of high-moisture, and moisture content is up to more than 95%.Moisture percentage in sewage sludge height, volume that sewage treatment plant comes out are big, need dewater earlier.General branch two-stage: the first order is a mechanical dehydration, and the second level is the heating power drying, and the degree of dehydration of this one-level depends on the further utilization of mud and disposes direction.
The dehydration present situation of China's mud is, moisture content behind the process one-level mechanical dehydration is mostly between 75-85%, because the sludge moisture content behind the process one-level mechanical dehydration is big, do not reach the technological requirement of subsequent treatment, therefore the subsequent treatment to mud has caused very big a burden and a difficult problem.At present the method for disposal of mud has: landfill, shelve in the open, methods such as compost and burning, landfill method is because the bulky and high diafiltration of mud pollutes soil, and cost is more and more higher, should progressively abolish; Shelve in the open, can utilize solar energy dehydration, energy savings, but Volatile Gas volume percolate makes or severe contamination environment, also should progressively abolish; Though compost is a kind of alternative method, can not be used to contain the mud of heavy metal, heavy metal is harmful to the growth of crops, can form heavy metal poisoning phenomenon in the food chain.Heat energy in the not only recyclable mud of burning method, and the technology maturation of control secondary pollution are a kind of environmentally friendly technology, should widely popularize.Yet the moisture content of mud must be dried to a certain degree, could burn.So the drying sludge of high performance-price ratio is an important topic that must solve.
At present, many countries have adopted the heated drying technology in Treatment of Sludge.Whether contact with mud according to thermal medium, existing mud heated drying technology: direct heat dry technology, indirect thermal dry technology and direct one indirect association type dry technology if can be divided three classes.
The direct heat dry technology claims the advection heat dry technology again.It is with a kind of method of gas heat carrier with the moisture removal in the mud.Dry efficient depends on following two factors: the self structure and the feature of condition of gas heat carrier (dew point, relative humidity, speed) and mud.In operating process, gas heat carrier (hot-air, flue gas or steam etc.) directly contacts with mud, and the gas heat carrier low-speed flow is crossed sludge blanket, absorbs the moisture in the mud in this process, and the dewatered sludge after the processing needs to separate with gas heat carrier.A waste gas part of discharging is got back in the original system usefulness again by heat recovery system, and rest parts is discharged through innoxious back.This technology heat transfer efficiency and evaporation rate are higher, can make the solid content of mud be increased to 85%～95% from 25%.
Mud gluing phase (moisture content is about 60%) can occur in dry run, in this extremely narrow changeover portion, mud very easily lumps, and dry rear surface is hard, be difficult to pulverize, and the inside is still sposh, gives the dry difficulty of bringing of crossing.For addressing this problem, in U.S.'s siccative back-mixing technology that has been born.Main points are as follows: the dried mud particle of certain proportion solid content＞90% is returned with the mud that wets mix, make dry granular play the effect of " nuclear ", it is outer that wet mud is wrapped in nuclear thinly, control is done, the mixed proportion of wet feed, make the moisture content of mixture drop to 30%～40%, the gluing phase that mud is just crossed can alleviate the bonding of mud in drier greatly, only need the moisture on evaporating particle top layer, drying is carried out easily.Yet this technology has reduced the treating capacity of equipment.
Owing to directly contact with mud, gas heat carrier will be polluted, and the waste water of discharge and steam must could discharge through after the harmless treatment; Simultaneously, gas heat carrier need be separated with dewatered sludge, brings certain trouble for operation and management.For reducing the efflux gas treating capacity, the gas recirculating process having appearred both at home and abroad: will efflux through the gas 85% after dedusting, condensation, the washing and return drier, and only will discharge after all the other 15% process thermal oxide deodorizing.Like this, not only reduced the vent gas treatment amount, also reduced the introducing amount of extraneous air, the content of oxygen in the rotary drum has been maintained lower level, thereby improved the security performance of system.
The tail of direct heat drying device is large-minded, processing cost height, and indirect, and the amount of tail gas is much smaller, and the burden of corresponding vent gas treatment is light, makes people forward interest to heat transfer efficiency low indirect again.
In the indirect thermal dry technology, heat carrier has two kinds of gas and liquid, and the former has hot-air, flue gas or steam etc., and the latter has conduction oil.They directly do not contact with mud, but by the heat exchange partition heat are transmitted dewing mud, make the water evaporates in the mud, and heat carrier also can not be subjected to the pollution of mud simultaneously, has save follow-up heat carrier and dewatered sludge separating process.Moisture evaporated condensation in the condenser in the process.The part of heat carrier is got back in the original system usefulness again, with energy savings.Because indirect heat transfer, the heat transfer efficiency of this technology and evaporation rate are all not as the direct heat dry technology.
Directly-the association type drying system then is the integration of convection current-conduction technique indirectly.
Brown coal are the minimum coal classes of degree of coalification.It is characterized in that high volatile, hydrophilic, high-moisture, low heat value, low ash smelting point, easily spontaneous combustion, be not suitable for storing and long-distance transportation.The average As-received low heat valve of brown coal has only about 3000kcal/kg, through upgrading, is a kind of high-quality thermal coal and chemical industry coal.The brown coal major part have bury shallow, the coal seam is thick, the characteristics of easy exploiting, and Stability Analysis of Structures, mining conditions is good, is suitable for polytechnic application and intensification is produced.
The average moisture content of brown coal can reach 45%.This coal is except that transforming on the spot, and is very unfavorable to long-distance transport.Carrying out brown coal sex change drying at above situation is an effective way.Brown coal are after the sex change drying, and its composition and character level off to bituminous coal, will more help utilizing, transportation and storing.In recent years, increasing to the dry working research of brown coal sex change, but use some method to make the brown coal sex change on Technological Economy, also have many problems.All research and the experiments in actively developing this field of states such as Japan, Australia, the U.S., Germany.More domestic scientific research departments and enterprise are also in the research of carrying out this respect and experiment at present.
Long-distance transportation high-moisture, low-calorie brown coal are non-remunerative economically.Assessment was once done to the effect of brown coal dehydration back minimizing freight volume by the U.S., the brown coal of a kind of moisture 42.52%, caloric value 2847kcal/kg, after the steam drying of 2.02Mpa, moisture reduces to 14.43%, caloric value is increased to 4315kcal/kg, is equivalent to improve calorific value 51.6%.In China all 2,400,000 kilowatts of units of power plant 1 year approximately to if brown coal moisture can be reduced to about 16% by 36%, then can reduce by 2,200,000 tons of Coal Transport in 1 year with 1,100 ten thousand tons in brown coal, save 66,000,000 yuan of freight charges.From the boiler combustion angle, burning high-moisture brown coal will cause flame temperature to reduce on the other hand, and the thermal efficiency descends.When power plant uses the dried brown coal of sex change, can significantly reduce or avoid the phenomenon of power plant's nominal output reduction.China's lignite resource is abundant, and therefore, the brown coal sex change dry technology that research and development have independent intellectual property right is a urgent task.
Water in the brown coal has three classes, i.e. Free water, inherent water and the crystallization water.When brown coal were heated to more than 100 ℃, most Free water can be evaporated.When brown coal continued to be heated to more than 150 ℃ under normal pressure, brown coal began to be removed in conjunction with water (inherent water), and hydroxy functional group (mainly is-COOH) decompose, separates out CO
2Gas, getting rid of simultaneously with brown coal in conjunction with water (inherent water).Further improve temperature, will cause increasing hydroxy functional group to decompose, thereby the surface nature that causes brown coal changes.The crystallization water is and the water of ash coexistence, could decomposes under higher temperature.
For the upgrading brown coal that need not way far away outward transport, for example be used for the brown coal of electric power stations near coal-mines, only need remove Free water.Need the brown coal of way far away outward transport, the essential dehydration degree of depth that improves is got damp easily because only remove the brown coal of Free water.Under higher baking temperature,, cause the pore of brown coal inside to decay and produce crosslinked because a large amount of hydroxy functional group decomposes.Pore decays and can stop moisture to enter pore; Cross-linking reaction then can seal pore, stops the pore that decays to expand when absorbing moisture again.In addition, when the brown coal temperature was heated to more than 200 ℃, its surface area can significantly reduce.The main cause that surface area reduces is that promptly tar is moved to the pore outside by pore inside owing to cause the strong migration of the tar of brown coal inside under the high temperature drying condition.The tar of moving to the pore outside is in cooling procedure, because tar condensing, thereby pore is sealed, and the surface area of brown coal is reduced.This process, promptly pore collapses, and cross-linking reaction and tar migration form sealing to pore, brown coal become more and more hydrophobic as a result, also can observe simultaneously the sclerosis of brown coal, this also causes the formation of the rigid structure of brown coal, and we claim that this process is the sex change drying.Consequently brown coal can be converted to hard coal from cherry coal, are converted to hydrophobicity by hydrophily, the reduction pyrophorisity, thus can realize the long-distance transport and the storage of brown coal.
The essential sex change baking temperature of brown coal is a kind of speciality of brown coal, and the brown coal that have are possibly up to more than 550 ℃, the temperature of promptly reach low, medium temperature carbonization is required, and this should be determined by experiment.Therefore, the present invention must not add qualification by the sex change baking temperature to this of brown coal.
With long-distance outward transport is that the prior art of purpose upgrading brown coal has multiple.Can be classified as follows them:
In general, the free moisture ratio that removes brown coal is easier to, but will remove relatively difficulty of brown coal inherent moisture and the mineral matter crystallization water.The drying and dehydrating technology of coal is broadly divided into mechanical dehydration, dehydration by evaporation and non-evaporating dehydrolysis three classes.Mature methods is used in brown coal dehydration at present and technology has: indirect evaporation (with steam cartridge type transformation apparatus), snead process (fluid bed dryer), non-evaporating dehydrolysis method (the D-K dewatering process of Japanese power supply development company and the exploitation of Kawasaki Heavy Industries company).
The brown coal dehydration is a kind of upgrading process, because the brown coal dehydration except that sloughing part moisture, also is accompanied by the variation of the The Nomenclature Composition and Structure of Complexes of some coals, makes brown coal have the upgraded coal of bituminous coal character.Domestic brown coal Upgrading Processes has been carried out having of industrialization formula production: the brown coal solid heat carrier method fast pyrolysis technology of Dalian University of Technology, the brown coal low temperature distillation upgrading technology of Anshan Thermal Energy Inst., the brown coal low temperature drying modification upgrading technology of Beijing Collins's Danone source technology development company, the silver-colored coal of Datang China purifies the transformation and quality improvement of low-rank coal LCC of key lab technology.
For low ash content high quality brown coal, low temperature distillation technology is produced high-quality reducing agent in can adopting, and substitutes the raw material that metallurgical coke is produced as ferroalloy, calcium carbide; Pyrolysis char can be used as active carbon, is used for sulfur removal sorbents and handles various trade effluents.Utilize the LCC technology can obtain stable in properties, modification coal that calorific value is high, simultaneously the high coalite tar of by-product added value.
China China mechanical industry group (Beijing), electric, Chinese east, Shanghai electric (Sichuan), 31 heavy industrys (Hunan), DaLian Re-Work, (in the research and development plan is listed the brown coal upgrading to middle letter heavy industry by this enterprise, and set up " low heat value brown coal upgrading new technical equipment " research and development seminar in Luoyang, Henan) etc. big machinery manufacturing enterprise, set for this platform by government, set up low heat value brown coal upgrading new technology and equipment research and development project, progressively form brown coal upgrading New Machining Technology and process equipment manufacture base.
But above-mentioned technology of researching and developing and equipment except the brown coal solid heat carrier method fast pyrolysis technology of Dalian University of Technology, all adopt the indirect heat transfer mode basically.
The core of heated drying is that heat is passed to mud and brown coal, makes water evaporates in mud and the brown coal by heating.The economy of process depends on the cost of producing heat carrier and the efficient of heat energy being passed to mud and brown coal.The former major decision operating cost, and the investment in fixed assets of latter's major decision.Pass to mud and brown coal again after the heat of primary energy (coal, oil, natural gas) burning passed to heat carrier, experienced diabatic process twice, well-known, in two kinds of heat transfer types, the equipment investment of direct heat transfer economizes most, and heat transfer efficiency is the highest.It is heat transfer type first-selected in the diabatic process.In the above-mentioned existing heated drying technology, the heat transfer technology of employing all is based on indirect heat transfer, therefore, all exists the essence shortcoming that is difficult to overcome.
The most frequently used is the heating power drying, adopts gas heat carrier, as hot-air (material that is dried can not be contaminated) and flue gas (material that is dried can be contaminated).Be characterized in that gas heat carrier directly contacts with the material that is dried, rate of drying height, (but except that flue gas, primary energy-coal, oil, natural gas burning heat are passed to hot-air still will adopt indirect mode to conduct heat).
These characteristics define when adopting heating power dry, can only adopt the indirect mode of heat energy being passed to material by partition to conduct heat.Used heat carrier gaseous state hot-air, hot flue gas and steam arranged, liquid have a conduction oil, except that flue gas, for obtaining the heat carrier of high temperature, the heat of primary energy (coal, oil, natural gas) burning is passed to heat carrier also will adopt indirect mode to conduct heat, the heat of primary energy has experienced twice diabatic process and just can pass to material in other words, make that this class drying equipment rate of heat transfer is low, the thermal efficiency is not high; Because this class material also has adhibit quality, in heat transfer and dry process of carrying out, need material is constantly stirred and stirs, the material heating surface is upgraded, make this class drying equipment structure complexity, volume intensity is very low, and consequently investment in fixed assets is expensive, operating cost is high.
Summary of the invention
For overcoming the existing above-mentioned essence shortcoming of heating power dry technology, the invention provides a kind of brand-new heating power seasoning.It is characterized in that: the combustion heat of fuel is directly passed to solid thermal carriers, solid thermal carriers and again heat is directly passed to the material that is dried, and two diabatic processes have all adopted the direct heat transfer mode; Solid thermal carriers can also play conveying, stir and stir the effect of material; Solid thermal carriers are the graininess material that looses, and require it to have higher thermal capacitance and thermal conductivity factor, good resistance to thermal shocks, enough intensity and wearabilities.What can be used as solid thermal carriers has: coarse sand granule, fire clay ball, steel or Cast-iron Ball, carborundum ball etc.Should according to the physico-chemical property of the material that is dried particularly corrosivity select.The piece of solid thermal carriers directly is recommended in the 20-50mm scope.
The invention will be further described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the flow chart that is applicable to the sludge of sewage treatment plants drying, and this flow process also is applicable to the drying that contains cobalt waste slurry and other industrial sludge in the PTA production process.Fig. 2 is the flow chart that is applicable to Powdered brown coal sex change drying.Among the figure: 1. vertical shaft type solid thermal carriers heating furnace, 2. spiral mixer, 3. former feed bin, 4. hothouse, 5. condenser, 6. air-introduced machine, 7. Bunker, 8. fluidized bed combustion stove, 9. cyclone dust collectors, 10. feed screw, 11. screening machine, 12. elevators, 13. feed bins, 14. the elevator feeder, 15. vibration unloaders, 16. electric cleaners, 17. oil water separator, 18. air blasts, 19. combustion chambers.
Exemplary embodiments
Fig. 1 is the flow chart that is applicable to the sludge of sewage treatment plants drying.
Moisture content behind the one-level mechanical dehydration is mostly delivered to former feed bin 3 at the mud of 75-85%, mix mutually via the high-temp solid heat carrier of spiral mixer 2 with vertical shaft type solid thermal carriers heating furnace 1, deliver to evaporation in the hothouse 4, the steam that produces is together with the fixed gas of being brought into by material and solid thermal carriers that peculiar smell is arranged and from system's leaked-in air, extract out by air-introduced machine 6 in the lump, through condenser 5, steam is condensed, and is transmitted back to sewage treatment plant.Have peculiar smell fixed gas and the air that contain saturation water are sent to fluidized bed combustion stove 8 and dewatered sludge (with the coal dust that replenishes) burning with air-introduced machine 6 and fresh sky, the high-temperature flue gas of burning is delivered in the vertical shaft solid thermal carriers heating furnace 1 through cyclone dust collectors 9, solid thermal carriers are heated, useless flue gas is effluxed by furnace roof, has the gas of peculiar smell to be decomposed through high temperature incineration.Mud that is dried and solid thermal carriers mixture were effluxed by 4 ends of hothouse, be dewatered sludge and solid thermal carriers through 11 screenings of feed screw 10 screening machines, solid thermal carriers rise to the top of vertical shaft type solid thermal carriers heating furnace 1 with elevator 12, all are distributed into stove through feed bin 13.Solid thermal carriers have been finished once circulation.
Embodiment 2 brown coal sex change dryings
Fig. 2 is the flow chart that is suitable for brown coal sex change drying.Because the sex change baking temperature height of brown coal often is accompanied by the generation of coal gas and tar, so the handling process of gas bleeding and drying sludge are different.
Moisture content is that about 40% brown coal are delivered to former feed bin 3, unloading the high-temp solid heat carrier that come with vertical shaft type solid thermal carriers heating furnace 1 through vibration unloader 15 via feed screw 10 mixes mutually, deliver to evaporation in the hothouse 4, the steam that produces is together with the fixed gas of being brought into by material and solid thermal carriers and from system's leaked-in air, extract out by air-introduced machine 6 in the lump, through electric cleaner 16, condenser 5, water vapour and tar are condensed, enter into oil water separator 17, be separated into tar and waste water, the fine coal dry ash during hothouse 4 is worked off one's feeling vent one's spleen effluxes from electric cleaner 16 end openings.Slough the coal gas of tar and water and deliver to combustion chamber 19 and the fresh air burning of sending here by air blast 18, as automatic gas-producing Enough not, additional with giving gas outward, the flue gas of burning directly is sent in the vertical shaft solid thermal carriers heating furnace 1, with the solid thermal carriers heating, useless flue gas is then effluxed by furnace roof.Brown coal that are dried and solid thermal carriers mixture were effluxed by 4 ends of hothouse, through feed screw 10, screening machine 11 screening is dried brown coal and solid thermal carriers, and solid thermal carriers rise to the top of vertical shaft type solid thermal carriers heating furnace 1 with elevator feeder 14, all are distributed into stove through feed bin 13.Solid thermal carriers have been finished once circulation.
Useful putting really
Because the combustion heat of fuel is passed to solid thermal carriers, solid thermal carriers are passed to material with heat again, have all adopted the direct heat transfer mode, so heat transfer efficiency is best, operating cost is low; Solid thermal carriers can also play conveying, stir and stir the effect of material, and structure is simpler, make drying equipment plot ratio height, and equipment investment is minimum; Efflux the volume minimum of tail gas, the difficulty of processing is few; There are peculiar smell fixed gas and air directly to send to burning, energy-conserving and environment-protective, economic operating cost.
Claims (4)
1. one kind is applicable to the loose solid thermal carriers seasoning of material of hydrophilics such as mud, brown coal.It is characterized in that: the combustion heat of fuel is directly passed to solid thermal carriers, solid thermal carriers and again heat is directly passed to the material that is dried, and two diabatic processes have all adopted the direct heat transfer mode.
2. loose solid thermal carriers seasoning of material of hydrophilics such as mud, brown coal that is applicable to as claimed in claim 1.It is characterized in that: described solid thermal carriers are in vertical shaft type solid thermal carriers heating furnace, heat with the high-temperature flue gas of fuel combustion.
3. one kind as claim 1 and 2 described the loose solid thermal carriers seasonings of material of hydrophilics such as mud, brown coal that are applicable to.It is characterized in that: described fuel has coal dust, flammable dewatered sludge, self produced gas, gives gas outward.
4. loose solid thermal carriers seasoning of material of hydrophilics such as mud, brown coal that is applicable to as claimed in claim 1.It is characterized in that: the material of described solid thermal carriers has coarse sand granule, fire clay ball, steel or Cast-iron Ball, carborundum ball, and the piece of solid thermal carriers directly is recommended in the 20-50mm scope.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102759257A (en) * | 2012-04-22 | 2012-10-31 | 广州市香港科大***研究院 | Biomass drying system applied to biomass power generation system |
| CN105276952A (en) * | 2015-10-27 | 2016-01-27 | 平顶山金晶生物科技有限公司 | Drying device for soybean dietary fiber dehydration |
| CN106829867A (en) * | 2017-04-14 | 2017-06-13 | 衢州市鼎盛化工科技有限公司 | The method and apparatus of fluorine-containing mixing spent acid comprehensive reutilization |
| CN109608012A (en) * | 2018-01-22 | 2019-04-12 | 喻万钧 | Waste tyre pyrolytic new energy heats air desiccation sewage plant sludge Processes and apparatus |
| CN113444536A (en) * | 2021-08-06 | 2021-09-28 | 宁夏大学 | System and method for biomass graded conversion and oil gas co-production through solar heat supply |
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| CN101387472A (en) * | 2008-10-09 | 2009-03-18 | 王绍良 | Waste drying method and system apparatus thereof |
| CN201327265Y (en) * | 2008-08-22 | 2009-10-14 | 北京中矿环保科技股份有限公司 | Sludge drying system, corresponding thermal power plant and sludge generating system |
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| US4620493A (en) * | 1985-08-30 | 1986-11-04 | The United States Of America As Represented By The United States Department Of Energy | Sewage sludge dewatering using flowing liquid metals |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102759257A (en) * | 2012-04-22 | 2012-10-31 | 广州市香港科大***研究院 | Biomass drying system applied to biomass power generation system |
| CN105276952A (en) * | 2015-10-27 | 2016-01-27 | 平顶山金晶生物科技有限公司 | Drying device for soybean dietary fiber dehydration |
| CN106829867A (en) * | 2017-04-14 | 2017-06-13 | 衢州市鼎盛化工科技有限公司 | The method and apparatus of fluorine-containing mixing spent acid comprehensive reutilization |
| CN109608012A (en) * | 2018-01-22 | 2019-04-12 | 喻万钧 | Waste tyre pyrolytic new energy heats air desiccation sewage plant sludge Processes and apparatus |
| CN113444536A (en) * | 2021-08-06 | 2021-09-28 | 宁夏大学 | System and method for biomass graded conversion and oil gas co-production through solar heat supply |
| CN113444536B (en) * | 2021-08-06 | 2022-03-18 | 宁夏大学 | System and method for biomass graded conversion and oil gas co-production through solar heat supply |
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Application publication date: 20110316 |