CN102927795A - System and method for drying brown coal indirectly in roller mode by flue gas - Google Patents
System and method for drying brown coal indirectly in roller mode by flue gas Download PDFInfo
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- CN102927795A CN102927795A CN2012102154912A CN201210215491A CN102927795A CN 102927795 A CN102927795 A CN 102927795A CN 2012102154912 A CN2012102154912 A CN 2012102154912A CN 201210215491 A CN201210215491 A CN 201210215491A CN 102927795 A CN102927795 A CN 102927795A
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Abstract
The invention relates to a system and a method for drying brown coal indirectly in a roller mode by flue gas, and is used for the field of the drying of brown coal. The system comprises a flue gas generation device, a roller type indirect drying device, a flue gas side induced draft fan, a brown coal channel side induced draft fan, a condensing tower and a fine powder separation device, wherein the roller type indirect drying device has a double-layer sleeve structure; an outer sleeve and an inner sleeve are formed by welding a plurality of flue gas pipelines; guide vanes are welded on the sleeve walls; and flue gas channels have a casing pipe structure, so that temperature in the sleeves in the axial direction is uniform. By the method, the flue gas generation device generates flue gas of 400 to 500 DEG C, and the flue gas and the brown coal in a brown coal channel are subjected to reverse flow indirect heat exchange by the flue gas channels, so that the brown coal is heated and dehydrated uniformly. By the system and the method, the brown coal is heated uniformly, and the problems of burst due to high temperature rise speed of brown coal particles, abrasion caused by incapability of rotation of a roller by the conventional indirect drying method and the like are solved.
Description
Technical field
The present invention relates to brown coal drying system, can be applied to a large amount of brown coal and continue drying, and greatly improve the deficiency that existing brown coal drying technology exists, make brown coal utilize more clean and effective.
Background technology
The lignite resource characteristics be reserves large, bury shallow, cost of winning is low.Global brown coal oil in place is 4,000,000,000,000 tons, accounts for nearly 40% of whole world coal reserves.The fat coal resources such as China's bituminous coal, anthracite have been fully utilized at present, and large-scale developing and utilizing just of brown coal begun.At the bottom of nineteen ninety-five, China has verified 1,303 hundred million tons of brown coal reserves, accounts for about 13% of national coal reserves, occupies critical role in coal resources in China.
The lignite resource of China is more concentrated, and three problems are but arranged in the brown coal utilization at present.The one, because grown place, brown coal place is underdeveloped, brown coal digest limited amount on the spot; The 2nd, need the economy of a large amount of coals more distant apart from the brown coal place of production than comparatively developed regions, and be non-remunerative economically to long-distance transportation high-moisture, low-calorie brown coal, especially the place of production is at the northeastern Inner Mongolia brown coal, the winter high-moisture brown coal cold in the north are frozen into piece easily, freeze railway carriage etc., serve trouble for the bands such as loading and unloading, transportation, Here it is, and there is economy problems in outside transportation; The 3rd, the high-moisture of brown coal, high-volatile, high ash content also are unfavorable for long-time storage.The difficult storage of brown coal and the problem of transportation cause lignite resource mainly to be used near coal-mine generating.And present electric coal is generally carried out high quality and favourable price, because the moisture golf calorific value is low, ton coal price is low, has caused the income from sales of coal to reduce.
Utilize approach so rationally expand brown coal, improve the economy of coal mining processing, satisfy the developed area to the demand of coal resources, be necessary the brown coal raw coal is carried out processed.Behind the brown coal drying, can greatly improve the caloric value of brown coal, realize economic transportation, improve burn-off rate and the boiler thermal output of boiler combustion, improve whole energy utilization rate.
The drying and dehydrating technology of coal is a lot, substantially can be divided into mechanical dehydration, non-evaporating dehydrolysis and dehydration by evaporation three major types, and dehydration by evaporation comprises again Direct Dehydration method and indirect evaporation.Wherein operating condition and method are comparatively simple comparatively speaking for the dehydration by evaporation mode, be fit to the preparation of a large amount of materials, therefore in order to utilize in a large number lignite resource, the processing of brown coal utilized the evaporation drying method both at home and abroad more, below it direct drying method that comprises and contact drying method done simple introduction:
One, direct drying method: can be called the contact drying method again, adopt dry gas and directly contact the heating brown coal with brown coal, make its dehydration, mostly the brown coal drying technology that has come into operation at present in China is to use this type of drying means, and the hot flue gas that generates with coal combustion is as drying medium.This mode equipment is the simplest, easy and simple to handle.But directly heating is higher owing to flue-gas temperature, flue gas and coal excessive temperature differentials, and the coal cinder heating rate is too fast, and coal cinder breaks easily and forms a lot of thin powder.The domestic main two kinds of methods of brown coal of transporting, the one, railway transportation, too much fine powder can cause a large amount of airborne dusts.The 2nd, the shipment sea-freight, near entrucking transportation after the unloading of the harbour user, in the process of stevedoring, can cause a large amount of airborne dusts equally, in a lot of situations in order to reach the effect that reduces airborne dust, can spray water, so then so that the dry brown coal of crossing are combined with water again, destroyed dry effect.Simultaneously, hybrid direct heating in the past can be adsorbed on the brown coal surface that is dried owing to contain a certain amount of dust in the flue gas, has affected the aesthetic property of dry rear brown coal, so that its real value is a greater impact.
Two, contact drying method: the indirect drying is generally the mode of heat medium in the pipe/outer coal of pipe, and wherein heat medium can be steam, oil or hot-air etc.What the indirect type drying device mainly adopted at present is the cartridge type external form.Adopt the contact drying method, at first flue gas and brown coal are separately, middle heat transfer resistance increases, so that the heating rate of coal particle slows down greatly, breaking of the coal cinder that effectively suppresses to know clearly reduced the ratio of fine powder in the dry rear brown coal, greatly reduce the difficulty of transportation, simultaneously brown coal separate with flue gas and have guaranteed that also brown coal can not improved the aesthetics of drying brown coal by the dust pollution in the flue gas, have improved its commercial value.The external brown coal drying mode that usually adopts is to utilize the high pressure-temperature saturated vapor to carry out indirect to brown coal, because the water saturation temperature is certain under the uniform pressure, can make that water vapour keeps saturation state always in the heating process, whole process temperature is constant, and heating rate is also more steady.But owing to can't realize rolling seal at connector position, therefore for preventing steam leakage, the general fixedly core structure that tilts that adopts heats.Yet fixing structure can cause having larger wearing and tearing at the jet chimney of the porch of coal, easily causes the steam leakage that causes because of transducer wall ' s abrasion.
Summary of the invention
Fast for the direct drying method rate of heat addition in the above-mentioned existing brown coal drying method, coal cinder breaks easily, and the contact drying method can't realize the problems such as rolling, the indirect brown coal drying system of a kind of drum-type flue gas and method are proposed, thereby it is too fast to solve temperature rise rate, the problems such as wearing and tearing that baking temperature skewness and heat-exchanger rig can't roll and bring.
Technical scheme of the present invention is as follows:
The indirect brown coal drying system of a kind of drum-type flue gas, it is characterized in that: comprise smoke generating appts, drum-type flue gas brown coal contact drying device, fume side air-introduced machine, brown coal channel side air-introduced machine, condensing tower and fine powder separator, described drum-type flue gas brown coal contact drying device comprises telescopic cylinder, frame and drive unit; Telescopic cylinder comprises urceolus and inner core, described urceolus and inner core are welded by many flues, all be welded with guide vane on inner core and the outer tube inner wall, form center brown coal passage in the center of inner core and urceolus, between urceolus and inner core, form annular brown coal passage; End at inner core and urceolus is provided with brown coal inlet tube, steam outlet pipe and gas collector, described fume side air-introduced machine is communicated with many exhaust gases passes of inner core and urceolus by gas collector, the steam outlet pipe is connected with brown coal channel side air-introduced machine, and the brown coal inlet tube is connected with annular brown coal passage with described center brown coal passage; The other end at inner core and urceolus is provided with drying brown coal outlet and flue gas distributor, and described smoke generating appts is communicated with many exhaust gases passes of inner core and urceolus by flue gas distributor; The drying brown coal outlet is connected with fine powder separator.
Technical characterictic of the present invention also is: the indirect brown coal drying system of drum-type flue gas also comprises nitrogen gas generating device, be provided with nitrogen inlet tube near flue gas distributor one end, nitrogen gas generating device is connected with annular brown coal passage with center brown coal passage by nitrogen inlet tube.
Another technology of the present invention is characterized in that: described flue adopts sleeve structure, is made of exhaust gases passes outer tube and adiabatic inner sleeve, and the internal diameter of exhaust gases passes outer tube is 100-115mm; The internal diameter of adiabatic inner sleeve is 70～80mm, and the length of adiabatic inner sleeve accounts for 45%～55% of whole flue.
A kind of drum-type flue gas contact drying brown coal method provided by the invention is characterized in that the method comprises the steps:
1) the hot flue gas that is produced by smoke generating appts enters the flue of inner core and urceolus by flue gas distributor;
2) brown coal enter respectively center brown coal passage and annular brown coal passage by coal bunker by the brown coal inlet tube, under the guide vane effect with flue in flue gas move with reflux type, the flue gas in the flue carries out indirect to brown coal;
3) flue gas through heat exchange leaves cylinder by smoke outlet tube by the effect of fume side air-introduced machine, and the steam that generates in the dry run enters condensing tower under the effect of brown coal channel side air-introduced machine, and steam condensation in condensing tower utilizes for the condensed water user;
4) dried brown coal enter fine powder separator via the drying brown coal outlet, and isolated bulky grain brown coal directly are transported to drying brown coal user place and utilize;
5) isolated thin brown coal particle enters smoke generating appts and burns, and replaces outside brown coal supply, realizes recycling.
The hot flue-gas temperature that produces in the described smoke generating appts is 400～500 ℃.
In the above-mentioned drum-type flue gas contact drying brown coal method, nitrogen by the nitrogen gas generating device generation, enter center brown coal passage and annular brown coal passage by the nitrogen inlet tube that is arranged in the flue gas distributor homonymy, nitrogen mixes with the steam of generation, and enter condensing tower by steam outlet and separate, realize recycling.
The present invention has the following advantages and the high-lighting effect: 1. cylinder of the present invention is double braid covering cartridge type structure, barrel is formed by the exhaust gases passes pipeline welding, the brown coal particle that drops into is subject to the effect of double-layer heating, individual layer heating as compared with the past, the technical program has increased heating surface area, makes heat transfer more even; 2. flue is sleeve structure, inside is adiabatic inner sleeve, flue gas is divided into two parts, part heating leading portion brown coal, another part mixes with the lower first's flue gas of temperature again in the passage stage casing, make the Temperature Distribution of whole dry run comparatively even, brown coal can be because of the too high explosion of local heat speed; 3. adopt this drum-type flue gas contact drying brown coal technology, the fine powder amount that produces in dry run reduces greatly, the fine powder amount that produces accounts for 8% of total coal amount, this part fine powder separates the needed flue gas of generation heating brown coal that can directly burn through fine powder separator in smoke generating appts, substantially reach self-sufficiency; 4. the brown coal channel side only has nitrogen and steam to exist, and the nitrogen G﹠W can be separated fully by condensing tower, and condensed water can directly utilize, and the nitrogen circulation utilization does not exist under the convection drying condition flue gas to the pollution problem of steam; 5. brown coal coal ash ash fusion point is low, can realize slag tap in smoke generating appts, has avoided the generation of dust.
Description of drawings
Fig. 1 is the schematic diagram of brown coal drying system.
Fig. 2 is the structural principle schematic diagram of drum-type flue gas brown coal contact drying device.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the profile of single flue.
Among the figure: the 1-smoke generating appts; 2-drum-type flue gas brown coal contact drying device; 3-fume side air-introduced machine; 4 brown coal channel side air-introduced machines; The 5-condensing tower; 6-condensed water user; The 7-fine powder separator; 8-drying brown coal user; The telescopic cylinder of 9-; The 10-guide vane; 11-brown coal inlet tube; 12-drying brown coal outlet; The 13-flue gas distributor; The 14-gas collector; The 15-nitrogen inlet tube; 16-steam outlet pipe; The 17-frame; The 18-drive unit; The 19-flue; 20a-center brown coal passage, 20b-annular brown coal passage; 21-exhaust gases passes outer tube; The 22-exhaust gases passes; The adiabatic inner sleeve of 23-.
The specific embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and the course of work are described further.
Fig. 1 is the schematic diagram of brown coal drying system, and this drying system comprises smoke generating appts 1, drum-type flue gas brown coal contact drying device 2, fume side air-introduced machine 3, brown coal channel side air-introduced machine 4, condensing tower 5 and fine powder separator 7.The hot flue gas that is produced by smoke generating appts 1 enters drum-type flue gas brown coal contact drying device 2, brown coal enter brown coal passage in the drum-type flue gas brown coal contact drying device by coal bunker by the brown coal inlet tube, and move with reflux type with cigarette, the flue gas in the flue carries out indirect to brown coal; Flue gas through heat exchange leaves cylinder by smoke outlet tube in 3 effects of fume side air-introduced machine, and the steam that generates in the dry run enters condensing tower 5 under 4 effects of brown coal channel side air-introduced machine, and steam condensation in condensing tower utilizes for condensed water user 6; Dried brown coal enter fine powder separator 7 via the drying brown coal outlet, and isolated bulky grain brown coal directly are transported to drying brown coal user 8 places and utilize; Isolated thin brown coal particle enters smoke generating appts 1 and burns, and replaces outside brown coal supply, realizes recycling.
Thereby smoke generating appts 1 is used for the fine powder generation flue gas brown coal that burning brown coal drying process generates; Fume side air-introduced machine 3 is used for making and is little subnormal ambient in the flue, prevents that the high-temperature flue gas leakage causes safety problem in the running; Brown coal channel side air-introduced machine 4, in order to guide steam and the nitrogen mixture body that produces in the dry run and make center brown coal passage and annular brown coal passage in be little negative pressure, prevent from that vapours from revealing to cause safety problem; Condensing tower 5 passes into cooling tower in order to the exhaust steam that will produce in the dry run and cools off, can with
Steam in the exhaust steamCondense and separate with N2, thus can water processed, to a certain degree solving local problem of water consumption, isolated N2 can again pass into the N2 entrance and carry out recycling; Condensed water user 6; Fine powder separator 7 is used for the fine powder that drying generates is separated with the bulky grain brown coal, and fine particle will be admitted in the smoke generating appts and generate flue gas through burning, be used for brown coal drying.
This brown coal drying system can also comprise a nitrogen gas generating device, be connected by nitrogen inlet tube 15 with drum-type flue gas brown coal contact drying device 2, can produce nitrogen in that system is in service, nitrogen enters the brown coal passage by nitrogen inlet tube 15, reduce the steam partial pressure in the brown coal passage, the steam that promotes the carrying out of dry run and carry generation leaves the brown coal passage.
Fig. 2 is the structure diagram of drum-type flue gas brown coal contact drying device, and this device comprises telescopic cylinder 9, frame 17 and drive unit 18; Telescopic cylinder 9 comprises urceolus and inner core, described urceolus and inner core are welded by many flues 19, all be welded with guide vane 10 on inner core and the outer tube inner wall, center at inner core and urceolus forms center brown coal passage 20a, forms annular brown coal passage 20b between urceolus and inner core; End at inner core and urceolus is provided with brown coal inlet tube 11, steam outlet pipe 16 and gas collector 14, described fume side air-introduced machine 3 is communicated with many exhaust gases passes of inner core and urceolus by gas collector 14, steam outlet pipe 16 is connected with brown coal channel side air-introduced machine 4, and brown coal inlet tube 11 is connected with annular brown coal passage 20b with described center brown coal passage 20a; The other end at inner core and urceolus is provided with drying brown coal outlet 12 and flue gas distributor 13, and described smoke generating appts 1 is communicated with many exhaust gases passes of inner core and urceolus by flue gas distributor 13; Drying brown coal outlet 12 is connected with fine powder separator 7.
The brown coal particle that drops into is subject to the effect of double-layer heating, individual layer heating as compared with the past, and double-layer heating has increased heating surface area, makes heat transfer more even; Guide vane 10 increases heat-transfer surface increase heat exchange efficiency in order to guide the transverse movement of brown coal in center brown coal passage and annular brown coal passage and brown coal can be brought to more high altitude thereby stir in the reinforcement cylinder; End at inner core and urceolus is provided with brown coal inlet tube 11, steam outlet pipe 16 and gas collector 14, fume side air-introduced machine 3 is communicated with many exhaust gases passes of inner core and urceolus by gas collector 14, be used for the low flue gas of temperature after the heat exchange being derived and making Cheng Wei negative pressure in the flue, the high-temperature flue gas that prevents from being in operation is revealed cause danger; Steam outlet pipe 16 is connected with brown coal channel side air-introduced machine 4, and the steam that is used for generating in center brown coal passage 20a and the annular brown coal passage 20b is derived; Brown coal inlet tube 11 is connected with annular brown coal passage 20b with center brown coal passage 20a, is used for carrying out drying in the brown coal importing cylinder to be dried; The other end at inner core and urceolus is provided with drying brown coal outlet 12, flue gas distributor 13 and nitrogen inlet tube 15, described smoke generating appts 1 is communicated with many exhaust gases passes of inner core and urceolus by flue gas distributor 13, and hot flue gas is evenly distributed in each exhaust gases passes; Drying brown coal outlet 12 is connected with fine powder separator 7, and being used for derives brown coal after the drying and fine powder is separated; Described nitrogen gas generating device is connected with annular brown coal passage 20b with center brown coal passage 20a by nitrogen inlet tube 15, is used for to brown coal passage nitrogen injection, leaves cylinder with the steam that reduces steam partial pressure and carry generation by steam outlet pipe 16; Cylinder is arranged on the frame 17 and drives running by drive unit 18.
Fig. 3 be the A-A of drum-type flue gas brown coal contact drying device to cutaway view, telescopic cylinder barrel is that flue about 100-115mm is welded by a plurality of bores; Inner core and outer tube inner wall all are welded with guide vane 19, pass through cylinder in order to drive brown coal by center brown coal passage 20a and annular brown coal passage 20b.
Fig. 4 is the profile of single flue, its structure is sleeve structure, the outer tube internal diameter is 100-115mm, adopt soot blower system, selective sootblowing, bigbore flue gas path can effectively prevent the dust in the flue gas owing to adhere to the flue obstruction that tube wall causes, and the regular ash that blows has also effectively been avoided piling up for a long time the blocked path that causes owing to dust in pipeline; Adiabatic inner sleeve 23, internal diameter is about 70-80mm, length is about the 45%-55% of whole flue gas path, flue-gas temperature keeps the substantially constant heat exchange with outside that do not participate in the pipeline section in order to keep, thereby guarantee that Temperature Distribution is more even in whole flue gas path, prevent that flue gas path first half section heating brown coal speed is too high and the second half section flue-gas temperature is excessively low; Flue gas passes through whole flue gas pipeline by flue gas path 22.
The operation principle of this brown coal drying system is initially to provide brown coal by the outside to smoke generating appts in operation, brown coal burn in smoke generating appts, the generation temperature is 400-500 ℃ hot flue gas, enter each flue 19 that forms cylinder wall from flue gas distributor 13, need brown coal to be processed to enter cylinder 9 by brown coal entrance 11, and be guided through center brown coal passage and the annular brown coal passage that telescopic cylinder is comprised of urceolus and inner core by guide vane 10.Flue gas and brown coal are taked the reflux type indirect heat exchange.Low-temperature flue gas after the heat exchange enters flue gas gas collector 14 by exhaust gases passes and discharges under the effect of fume side air-introduced machine 3, in the whole process, fume side air-introduced machine 3 remains and is little negative pressure in the flue, prevents that hot flue gas leakage causes safety problem in running.In the brown coal drying process, separate from the brown coal particle for preventing center brown coal passage and the too high inhibition steam of annular brown coal passage internal cause steam partial pressure, nitrogen can be passed into the brown coal passage by nitrogen inlet tube 15, reduce the in-channel water partial vapour pressure and under the effect of brown coal channel side air-introduced machine 4, steam is carried out the brown coal passage from steam outlet pipe 16, to reach better drying effect.Brown coal channel side air-introduced machine 4 is introduced condensing tower 5 with nitrogen and the dry steam that generates from steam outlet pipe 16, through condensing heat-exchange, condensed water can be delivered to condensed water user 6 and utilize, this is significant for western water-deficient area, nitrogen can pass into nitrogen inlet 15 and again participate in circulation, thereby replaces outside nitrogen gas generator.Brown coal enter fine powder separator 7 by drying brown coal outlet 12 after dry.Adopt drum-type brown coal drying technology, the fine powder amount that produces in dry run reduces greatly, but still can produce the fine powder that accounts for total amount about 8%, smoke generating appts 1 be separated and be admitted to the brown coal fine particle that generates in the dry run will by fine powder separator 7, thereby replace outside coal supply, reach self-sufficiency, simultaneously for fear of dust, utilize the low-melting characteristics of lignite ash can realize slag tap, retention efficiency is more than 70%.And the oarse-grained brown coal particle of separating will be transported to drying brown coal user 8.
Claims (6)
1. indirect brown coal drying system of drum-type flue gas, it is characterized in that: this drying system comprises smoke generating appts (1), drum-type flue gas brown coal contact drying devices (2), fume side air-introduced machine (3), brown coal channel side air-introduced machine (4), condensing tower (5) and fine powder separator (7), and described drum-type flue gas brown coal contact drying device comprises telescopic cylinder (9), frame (17) and drive unit (18); Telescopic cylinder (9) comprises urceolus and inner core, described urceolus and inner core are welded by many flues (19), all be welded with guide vane (10) on inner core and the outer tube inner wall, center at inner core and urceolus forms center brown coal passage (20a), forms annular brown coal passage (20b) between urceolus and inner core; End at inner core and urceolus is provided with brown coal inlet tube (11), steam outlet pipe (16) and gas collector (14), described fume side air-introduced machine (3) is communicated with many exhaust gases passes of inner core and urceolus by gas collector (14), steam outlet pipe (16) is connected with brown coal channel side air-introduced machine (4), and brown coal inlet tube (11) is connected with annular brown coal passage (20b) with described center brown coal passage (20a); The other end at inner core and urceolus is provided with drying brown coal outlet (12) and flue gas distributor (13), and described smoke generating appts (1) is communicated with many exhaust gases passes of inner core and urceolus by flue gas distributor (13); Drying brown coal outlet (12) is connected with fine powder separator (7).
2. the indirect brown coal drying system of a kind of drum-type flue gas according to claim 1, it is characterized in that: the indirect brown coal drying system of drum-type flue gas also comprises nitrogen gas generating device, be provided with nitrogen inlet tube (15) near flue gas distributor (13) one ends, nitrogen gas generating device is connected with annular brown coal passage (20b) with center brown coal passage (20a) by nitrogen inlet tube (15).
3. the indirect brown coal drying system of a kind of drum-type flue gas according to claim 1, it is characterized in that: flue (19) adopts sleeve structure, be made of exhaust gases passes outer tube (21) and adiabatic inner sleeve (23), the internal diameter of exhaust gases passes outer tube is 100-115mm; The internal diameter of adiabatic inner sleeve is 70～80mm, and the length of adiabatic inner sleeve accounts for 45%～55% of whole flue.
4. a kind of drum-type flue gas contact drying brown coal method as claimed in claim 1 is characterized in that the method comprises the steps:
1) the hot flue gas that is produced by smoke generating appts enters the flue of inner core and urceolus by flue gas distributor;
2) brown coal enter respectively center brown coal passage and annular brown coal passage by coal bunker by the brown coal inlet tube, under the guide vane effect with flue in flue gas move with reflux type, the flue gas in the flue carries out indirect to brown coal;
3) flue gas through heat exchange leaves cylinder by smoke outlet tube in the effect of fume side air-introduced machine, and the steam that generates in the dry run is by entering condensing tower under the effect of brown coal channel side air-introduced machine, and steam condensation in condensing tower utilizes for the condensed water user;
4) dried brown coal enter fine powder separator via the drying brown coal outlet, and isolated bulky grain brown coal directly are transported to drying brown coal user place and utilize;
5) isolated thin brown coal particle enters smoke generating appts and burns, and replaces outside brown coal supply, realizes recycling.
5. a kind of drum-type flue gas contact drying brown coal method according to claim 4, it is characterized in that: the hot flue-gas temperature that produces in the smoke generating appts is 400～500 ℃.
6. a kind of drum-type flue gas contact drying brown coal method according to claim 4, it is characterized in that: by the nitrogen of nitrogen gas generating device generation, enter center brown coal passage and annular brown coal passage by the nitrogen inlet tube that is arranged in the flue gas distributor homonymy, nitrogen mixes with the steam of generation, and enter condensing tower by steam outlet and separate, realize recycling.
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| CN105675643A (en) * | 2016-01-21 | 2016-06-15 | 南京理工大学 | Cook-off test apparatus of composite solid propellant |
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| CN108679988A (en) * | 2018-06-08 | 2018-10-19 | 中国成达工程有限公司 | A kind of non-direct contact lignite drying unit and stoving process |
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| CN102927795B (en) | 2014-12-17 |
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