CN101726167B - Smoke semi-closed circulating lignite straight pipe type airflow drying method - Google Patents
Smoke semi-closed circulating lignite straight pipe type airflow drying method Download PDFInfo
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- CN101726167B CN101726167B CN 200810224613 CN200810224613A CN101726167B CN 101726167 B CN101726167 B CN 101726167B CN 200810224613 CN200810224613 CN 200810224613 CN 200810224613 A CN200810224613 A CN 200810224613A CN 101726167 B CN101726167 B CN 101726167B
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Abstract
The invention relates to a smoke semi-closed circulating lignite straight pipe type airflow drying method, which ensures the safety and reliability of a device and makes the maximization of the device possible through direct combustion of lignite to generate smoke, once drying of a straight pipe type airflow dryer to meet the moisture requirement of a product, large-grain inertia setting, collection of a fine grain bag type dust collector, even blending of large grains and fine grains through a blending device, emptying and air quantity control through a mixed temperature fan and a booster fan.
Description
Technical field
The present invention relates to the brown coal drying technical field, is the circulating convection drying method in brown coal flue gas semi-closure road, belongs to convection heat transfer' heat-transfer by convection type drying.
Background technology
Brown coal are the minimum coals of degree of coalification, form for peat changes under modest pressure, degree of coalification between peat and bituminous coal, water content height, easy-weathering in air; Contain a certain amount of original humic acid; Phosphorus content is low, the oxygen content height, and hydrogen content changes greatly; Volatile matter generally between 45%～55%, easily spontaneous combustion.
80 tons of/hour brown coal pneumatic conveying drying modes were not met report at home as yet.Domestic the device of report is arranged is that the production capacity that Shizuishan coke-oven plant, Ningxia built up in 1994 is the process units of 40,000 t/a, and accompanying drawing 2 is seen in this technological process.Existing problems have: 1. the drying of coal need adopt economizer bank, heating tube, drying tube three-stage drying just can reach requirement, the corollary equipment complexity that needs, and the equipment joint face is many, system's negative pressure, the air that bleeds easily, oxygen content is wayward, the equipment popularization of can't maximizing; 2. cyclone separator is adopted in dedusting, and equipment attrition is serious, and as adopting spraying technology, equipment investment is big; 3. thermal source adopts coal gas, is secondary energy sources, and the place of no secondary energy sources such as mining factory can't be used; 4. unit scale is little, and the amplification degree-of-difficulty factor is big, can't satisfy the needs that large-scale industrialization is produced.
Summary of the invention
The inventor is engaged in the pneumatic conveying drying Study on Technology for a long time, promotion and application, through the years of researches exploitation, all kinds pneumatic conveying drying technology obtains huge development, not only at the drying process characteristics of air-flowing type drying, develop the heat transfer coefficient computational methods, many technology theories such as the wet part profile of equilibrium of time of staying distributed model and system, and forming multiple proprietary technology aspect all kinds pneumatic drier mechanical development, the wherein multi-functional micron dryer (patent No.: ZL02262102.4) with the novel Rotatingandflashstreamingdrier (patent No.: ZL200420078365.2) obtain china national practical new-type patent.
For the hidden peril of explosion of stopping brown coal device drying system and the popularization of maximization, the flue gas thermal source is simple, cuts down the consumption of energy, and the inventor has proposed a kind of safe and reliable flue gas semi-closure road circulation brown coal straight pipe type airflow drying method by research and development for many years.
Flue gas semi-closure road circulation brown coal straight pipe type airflow drying method of the present invention comprises the following steps:
(A) by the brown coal generation flue gas that directly burns;
(B) use this flue gas the wet-milling coal to be sent into the straight pipe type airflow drying machine as carrier, primary drying reaches product and requires (for example below 5%) for wet part, discharge the dry back of acquisition fine coal from outlet, and the large granule that is not taken up by hot blast discharges in the awl section deposition of straight pipe type airflow drying machine bottom;
(C) described dry back fine coal enters inertial settling and blending device (being made up of top inertia separator and bottom mixing silo), sack cleaner successively with tail gas, thick brown coal coal dust by the inertial settling effect in inertial settling and blending device under collected directly enters the bottom mixing silo, and enters fines that sack cleaner is captured transfers to inertial settling and blending device by conveying device bottom mixing silo;
(D) powder particle of different-grain diameter evenly mixes in the bottom mixing silo of inertial settling and blending device, promptly obtains dry fine coal finished product.
Preferably, in step (A), after supercharging, enter the coal hot-blast stove by extraneous combustion air, the fuel brown coal add the coal hot-blast stove through feeding device and burn, and produce described flue gas.
Preferably, aspirate by two parallel fans by the clean tail gas after the sack cleaner purification, wherein first's tail gas is delivered to the coal hot-blast stove after pressurizeing by booster fan, to reduce temperature in the burner hearth, reduce burning back oxygen content of smoke gas, second portion tail gas is by emptying and mix a warm blower fan suction back part and be sucked up to a duct type blender, and sends into the straight pipe type airflow drying machine, the then direct emptying of another part tail gas after flue gas that the coal hot-blast stove produces mixes.
Preferably, the outlet temperature of coal hot-blast stove is controlled to be 800-900 ℃, preferred 850 ℃.
Preferably, described flue gas further separates the ashes that the coal Combustion of Hot Air Furnace is carried by high temperature cyclone separator, the clean high-temperature flue gas that produces mixes by the duct type blender with the clean tail gas that reaches mixed warm blower fan outlet from emptying, the control oxygen content of smoke gas is less than 8%, temperature is controlled at 600-750 ℃, preferred 650 ℃, deliver to straight pipe type airflow dryer entrance mouth, as the carrier of wet stock drying, conveying.
Wherein, wet-milling coal from feed arrangement, enter in the straight pipe type airflow drying machine, the vertical drop after the sub-material buffer unit is passed through in the inside of straight pipe type airflow drying machine of wet-milling coal, with high speed hot blast counter current contacting, the moisture in the fine coal is taken away by the elevated temperature heat smoke evaporative, and dried pulverized coal particle is brought to the drier stage casing, through delivering to outlet after the ring acceleration that elutriates, the awl section of large granule in straight pipe type airflow drying machine bottom that is taken up by hot blast deposits discharging.
The present invention is to be main equipment with the straight pipe type airflow drying machine, the drying process complete set technology that forms in conjunction with the brown coal material feature.
The straight pipe type airflow drying machine that the present invention uses has following feature:
(1) dry tenacity is big: pneumatic conveying drying is owing to the air velocity height, and particle is good dispersion in gas phase, can be long-pending as dry effective area all surfaces of particle;
(2) drying time is short: the time of contact that gas-solid is two is short, and generally in 0.5-2 second, the longest be 5 seconds to drying;
(3) thermal efficiency height; The gas access temperature of pneumatic conveying drying is high more, and the thermal efficiency is high more, generally all more than 60%;
(4) treating capacity is big, is applicable to continued operation;
(5) equipment is simple; The pneumatic conveyer dryer device structure is simple, take up an area of little, reduced investment, operation being easy to automatic control;
(6) applied range; Pneumatic conveying drying can be used in various powder and granule shape materials, and the wet part scope of inlet feed is wide.
The design feature of straight pipe type airflow drying machine is as follows:
(1) adopts the large tracts of land air inlet, after high-temperature hot-air enters, gas is quickened through first accelerating sections, enter the pneumatic drier straight length, during hot blast is upwards advanced, with before wet coal dust contacts once more through second accelerating sections, upwards impact flow, dry wet coal dust at a high speed;
(2) at the straight length of charging aperture bottom, install distributor.Behind the charging aperture of wet coal dust through inclination, flow downward with certain speed, when straight length process distributor, since distributor designs have special break up, distribution equalizing structure, wet coal dust is broken up, uniform, obstruction, become the state to be dried that size is comparatively even, initial velocity is very little, help the carrying out of next step dry run;
(3) in the easy spontaneous combustion section installing in drying tube top and bottom water spray fire prevention system, adopt efficient fan nozzle, can carry out solid cone shaped sprays, when abnormal conditions such as inner barrel generation spontaneous combustion, can cover whole inner barrel with high pressure fire fighting water, prevent the generation of extreme cases such as spontaneous combustion, blast;
(4) design has taper feed bin and bulky grain outlet in the drying tube bottom.When the bulky grain of only a few in the wet coal dust can't be taken away by heated-air drying, can fall into the bottom feed bin downwards, the rotation discharge valve is installed, discharge the wet coal dust of bulky grain at any time at outlet, prevent the accumulation of coal dust, thereby stop the generation of dangerous situations such as spontaneous combustion of pulverized coal, blast completely;
(5) be equiped with the safety anti-explosive door at the airflow drying tube top.The safety anti-explosive door adopts gravity type to recover structure automatically, when unsafe conditions such as generation spontaneous combustion, blast, explosion proof door is opened automatically and is carried out pressure releasing, dangerous pressure relief is recovered just often in cylindrical shell, explosion proof door automatically reverts to the installation site under the gravity effect, guarantee the safe and stable operation of system;
The advantage of method of the present invention is as follows:
1. the flue gas semi-closure road circulation brown coal straight pipe type airflow drying method of the present invention's proposition has solved the difficult problem that brown coal drying maximizes effectively, compares with general flow simultaneously, has shortened drying technology process.
2. the flue gas semi-closure road circulation brown coal straight pipe type airflow drying of the present invention's proposition is compared with traditional hot-air open circuit drying, and tail gas has adopted two typhoon machine parallel connections, and Each performs its own functions for every typhoon machine, both guaranteed the security of system, reduced the power of blower fan again.
3. the present invention adopts dust removal combined, the hybrid technique of inertial settling, mixing silo and sack cleaner, both the system dust removing effect has been had assurance, has solved the granule impact wear problems, has reduced investment, has guaranteed that again product particle is even, has improved product quality.
Description of drawings
Fig. 1 is a flue gas semi-closure road circulation brown coal straight pipe type airflow drying method process chart: 1 coal hot-blast stove; 2 cyclone separators; 3 duct type blenders; 4 straight pipe type airflow drying machines; 5 feed arrangements; 6 inertial settlings and blending device; 7 buffering batch cans; 8 sack cleaners; 9 conveying devices; 10 booster fans; 11 emptyings and mixed warm blower fan.
Fig. 2 is the prior art processes flow chart: 21 circulating fans; 22 catalytic converters; 23 cyclone separators; 24 cyclone separators; 25 drying tubes; 26 feeders; 27 cyclone separators; 28 cyclone separators; 29 economizer banks; 30 heating tubes; 31 combustion furnaces; 32 combustion furnaces.
Fig. 3 is the concrete structure figure of straight pipe type airflow drying machine: 41 charging apertures; 42 gravity type explosion proof doors; 43 elastic supports; 44 rings that elutriate; 45 water spray fire prevention systems; 46 distributors; 47 air inlets; 48 bulky grains are discharged system.
The specific embodiment
Now flue gas semi-closure road circulation brown coal straight pipe type airflow drying technology process is elaborated in conjunction with Fig. 1.
Extraneous combustion air is after supercharging, enter coal hot-blast stove 1, the fuel brown coal add coal hot-blast stove 1 through feeding device and burn, blow out into burner hearth through the tail gas of booster fan 11 about 110 ℃, control coal hot-blast stove 1 outlet temperature is 850 ℃, the control oxygen content of smoke gas is less than 8%, further separate the ashes that 1 burning of coal hot-blast stove is carried through high temperature cyclone separator 2, the clean high-temperature flue gas that produces mixes by duct type blender 3 with the clean tail gas that reaches mixed warm blower fan 10 outlets from emptying, temperature is controlled at 650 ℃, deliver to straight pipe type airflow drying machine 4 air inlets, as the wet stock drying, the carrier of carrying.
From the wet-milling coal of feed arrangement 5, enter in the straight pipe type airflow drying machine 4, described straight pipe type airflow drying machine 4 comprises charging aperture 41 as shown in Figure 3; Gravity type explosion proof door 42; Elastic support 43; Ring 44 elutriates; Water spray fire prevention system 45; Distributor 46; Air inlet 47; Bulky grain is discharged system 48.The vertical drop after the sub-material buffer unit is passed through in the inside of straight pipe type airflow drying machine 4 of wet-milling coal, with high speed hot blast counter current contacting, moisture in the fine coal is taken away by the elevated temperature heat smoke evaporative, dried pulverized coal particle is brought to the drier stage casing, through delivering to outlet after the ring acceleration that elutriates, the large granule that is taken up by hot blast discharges in the awl section deposition of straight pipe type airflow drying machine 4 bottoms.
Arrive the brown coal that 4 outlets of straight pipe type airflow drying machine reach the moisture content requirement, enter inertial settling and blending device 6, sack cleaner 8 successively with tail gas, inertial settling and blending device 6 collected thick brown coal coal dusts directly enter the bottom mixing silo, sack cleaner 8 is pounced on the fines of collection and is reprinted to inertial settling and blending device 6 by conveying device 9, the pulverized coal particle of different-grain diameter enters fender jar 7 after evenly mixing in inertial settling and blending device 6, as the head tank of follow-up system.
Aspirate by two parallel fans by the clean tail gas after sack cleaner 8 purifications, wherein first's tail gas is delivered to coal hot-blast stove 1 after pressurizeing by booster fan 11, to reduce fire box temperature, reduce burning back oxygen content of smoke gas, parts are sucked up to duct type blender 3 to second portion tail gas by emptying and after mixing warm blower fan 10 suctions, and another part tail gas is directly emptying then.
Effect:
Use method of the present invention in 0.5Mt/a brown coal device for improving quality industrial production, to use; burning, explosion accident in not only having stopped to produce; and improved the product cut size distribution; large granule is discharged by straight pipe type drying machine bottom awl section, and bulky grain and fine grain blending make the efficiency of dust collection height; particle mixes in the product; guaranteed the product quality of follow-up system ball operation, high moisture content brown coal can a convection drying, and has realized industrial extensiveization.
Claims (6)
1. flue gas semi-closure road circulation brown coal straight pipe type airflow drying method, this method comprises the following steps:
(A) by the brown coal generation flue gas that directly burns;
(B) use this flue gas the wet-milling coal to be sent into the straight pipe type airflow drying machine as carrier, primary drying reaches wet part of predetermined prod, discharge the dry back of acquisition fine coal from outlet, and the large granule that is not taken up by hot blast discharges in the awl section deposition of straight pipe type airflow drying machine bottom;
(C) described dry back fine coal enters inertial settling and blending device, sack cleaner successively with tail gas, directly enter the bottom mixing silo by the thick brown coal coal dust under collected in inertial settling and blending device, and enter fines that sack cleaner is captured transfers to inertial settling and blending device by conveying device bottom mixing silo;
(D) powder particle of different-grain diameter evenly mixes in the bottom mixing silo of inertial settling and blending device, promptly obtains dry fine coal finished product;
Wherein, aspirate by two parallel fans by the clean tail gas after the sack cleaner purification, deliver to temperature and oxygen content in the coal hot-blast stove control stove after wherein first's tail gas pressurizes by booster fan, a part is sucked up to a duct type blender to second portion tail gas by emptying and after mixing warm blower fan suction, with send into the straight pipe type airflow drying machine, the then direct emptying of another part tail gas after flue gas that the coal hot-blast stove produces mixes.
2. method according to claim 1, wherein produce through the following steps at flue gas described in the step (A): extraneous combustion air enters the coal hot-blast stove after supercharging, and the fuel brown coal add the coal hot-blast stove through feeding device and burn.
3. method according to claim 1, wherein the outlet temperature of coal hot-blast stove is controlled to be 800-900 ℃.
4. method according to claim 3, wherein the outlet temperature of coal hot-blast stove is controlled at 850 ℃.
5. method according to claim 1, wherein said flue gas further separates the ashes that the coal Combustion of Hot Air Furnace is carried by high temperature cyclone separator after producing, the clean high-temperature flue gas that produces mixes by the duct type blender with the clean tail gas that reaches mixed warm blower fan outlet from emptying, the control oxygen content of smoke gas is less than 8%, temperature is controlled at 600-750 ℃, deliver to straight pipe type airflow dryer entrance mouth, as the carrier of wet stock drying, conveying.
6. method according to claim 5, wherein said temperature are controlled at 650 ℃.
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Cited By (1)
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| WO2014071800A1 (en) * | 2012-11-07 | 2014-05-15 | 阳光凯迪新能源集团有限公司 | Method and apparatus for drying biomass raw material using biomass boiler flue gas |
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