CN111678311B - Rotary heat-conducting oil boiler tube array dryer integrated device - Google Patents
Rotary heat-conducting oil boiler tube array dryer integrated device Download PDFInfo
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- CN111678311B CN111678311B CN202010690401.XA CN202010690401A CN111678311B CN 111678311 B CN111678311 B CN 111678311B CN 202010690401 A CN202010690401 A CN 202010690401A CN 111678311 B CN111678311 B CN 111678311B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/02—Heating arrangements using combustion heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention belongs to the technical field of electric power, chemical engineering and energy, and particularly relates to a rotary heat-conducting oil boiler tube-array dryer integrated device for deep drying of lignite. The device processing technology is as follows: the rotary heat conduction oil boiler in the rotary state directly injects 300-DEG C high-temperature heat conduction oil into the tube bundle in the tube array dryer through the heat conduction oil circulating pump, after lignite in the tube array dryer is heated by the tube bundle, crystalline internal water is quickly pyrolyzed and escapes from the interior of the lignite to be dehydrated and evaporated, and the dehydrated lignite falls into the receiving bin from the discharge opening to be processed. The conventional tube dryer can not seal high-pressure steam due to the rotary joint, only low-temperature steam below 180 ℃ can be used for drying the lignite, and the process requirement that water in the lignite can be quickly pyrolyzed and escaped at a high temperature of more than 250 ℃ can not be met. According to the invention, the rotary heat-conducting oil boiler is adopted to heat the heat-conducting medium, and the high-temperature heat-conducting medium can be directly injected into the tube bundle of the tube still dryer without passing through the rotary joint, so that the industrial problem that water in the lignite crystalline state is difficult to remove is solved.
Description
Technical Field
The invention belongs to the technical field of machinery, electric power and coal chemical industry, and particularly relates to a rotary heat-conducting oil boiler tube dryer integrated device for deep drying of lignite, which is used for deep dehydration, drying and upgrading of lignite.
Background
The energy structure of China is mainly coal, in the eastern coastal areas with industrial concentration, local high-quality coal is basically exhausted due to long-term exploitation, economic operation is maintained mainly by east transportation of western coal, transportation cost accounts for more than half of coal cost, and operation cost of energy and chemical industry is increased. In the eastern area of inner Mongolia, nearly billions of tons of high-quality lignite are stored, and because the water content is up to 35-50%, and a large amount of heat is absorbed by water during combustion, the heat productivity is far lower than the use standard of a power plant, so that the resources cannot be reasonably utilized for a long time. If the water in the lignite can be effectively separated and removed, most of energy requirements of eastern areas can be completely met, so that the country attaches great importance to and actively encourages enterprises to develop and manufacture relevant technologies of lignite dehydration and drying upgrading, and a large amount of relevant equipment enters industrial application.
At present, the lignite drying technology at home and abroad is various, and the mainstream drying technology which is applied industrially comprises two types:
1. the lignite is directly heated and dried by high-temperature and high-speed hot air, the water in the coal is evaporated by the high-temperature air through convection, and the hot steam is separated from the lignite through high-speed airflow. The process equipment adopting the convection heating drying method comprises drum drying, fluidized bed drying, flash drying, vibrating bed drying, conveyer belt drying and mixed application of the methods. By adopting the vibrating bed technology of low-temperature hot gas drying at 200 ℃, the water in the lignite can not be deeply degraded because the water in a crystalline state (called as internal water in the industry) in the lignite can not be quickly and effectively decomposed, and the drying effect is not ideal and is less in application. The technology of 600-700 ℃ high-temperature air drying, such as a roller, a fluidized bed, flash drying and the like, is adopted, because the ignition temperature exceeds 270 ℃ of the lignite, and simultaneously the high temperature can decompose a large amount of combustible volatile gas from the lignite, for example, once the oxygen content of hot flue gas exceeds the standard, major safety accidents such as deflagration are easy to happen, the technology is mainly used for drying water-containing coal slime in a coal washery and drying low-volatile bituminous coal at present, and most of lignite drying and upgrading enterprises are stopped for safety reasons.
2. The lignite is directly or indirectly heated by hot steam, and then the moisture in the lignite is reduced by extrusion or evaporation.
The supersaturated high-pressure steam direct heating process is characterized by injecting high-temperature and high-pressure steam into a high-pressure kettle, so that crystal-state internal water in the lignite in the high-pressure kettle is in a high-temperature and high-pressure state, the crystal-state structure is quickly pyrolyzed and escapes from the lignite, and then the lignite is moved out of the high-pressure kettle to be extruded and evaporated for precipitation. The technology is carried out in a heating and drying way in a subsection way, can deeply remove internal water, and is mainly used for the coal industry needing to deeply dry lignite. Because the high-pressure autoclave coal loading, unloading and sealing equipment has complex technology, large investment, long production period and high cost, the method is not suitable for drying and upgrading the lignite on a large scale at low cost.
The low-temperature steam tubulation indirect heating process is characterized in that low-temperature steam is injected into a pipe bundle of a rotary tubulation dryer, heat is conducted into lignite in a roller through the pipe bundle, and moisture in the lignite is reduced through evaporation. The process can be used for continuous production and does not generate deflagration, and is a mainstream lignite drying and upgrading technology currently used at home and abroad. The technology adopts a rotary joint mode to inject steam into a rotating tube nest, is limited by the existing processing technology, the rotary joint is difficult to seal high-pressure saturated steam, so that only low-pressure and low-heat steam with the temperature lower than 180 ℃ can be conveyed, and crystal water (inner water) in lignite can be quickly decomposed and escaped from the inside only in a high-temperature state of more than 250 ℃, so that the technology adopts a low-temperature steam tube nest drying technology, and because the inner water cannot be effectively and deeply removed, the optimal upgrading effect cannot be achieved, the technology is mainly used for upgrading lignite in a power plant, and cannot be used in industrial scenes such as coal chemical industry and micro-coal atomization which need deep dehydration.
At present, with the rapid development of new coal cleaning application technology industries such as coal chemical industry and 'micro-coal atomization', the existing lignite dehydration and drying technology can not meet the industrial requirements, and a new lignite drying technology and new equipment capable of safely, efficiently and deeply removing internal water are urgently needed in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a rotary heat transfer oil boiler tube-array dryer integrated device which is safe and efficient and can deeply remove water in lignite.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a rotatory conduction oil boiler tube dryer integrated device that slope was placed, includes the combustor, rotatory conduction oil boiler, the conduction oil circulating pump, the tube dryer, conduction oil return line, the sealed batch oil tank of elastic expansion, brown coal feeder, the discharge opening, receive the feed bin, hot flue gas transmission pipeline, medium temperature flue gas transmission pipeline, central flue gas transmission pipeline, evaporation tail gas discharge pipeline, dust removal and condensate recovery system, the barrel rotates the motor, the barrel rotates the bearing roller.
The combustor can be one of pulverized coal, fuel oil and gas combustors, high-temperature furnace gas generated by the combustor is sprayed into a furnace body of a rotary heat-conducting oil boiler, heat-conducting oil in a furnace tube bundle is heated to be close to 300 ℃, then a heat-conducting oil circulating pump is injected into a tube bundle of a tubular drier which synchronously rotates through a direct connection pipeline, heat of the heat-conducting oil is conducted to lignite in the tubular drier through the tube bundle, and the heat-conducting oil after heat release returns to the heat-conducting oil boiler from the other end of the tube bundle of the tubular drier through a return pipeline to form a continuous circulation working state. After the heat conduction oil is heated to nearly 300 ℃ from normal temperature, the volume can be obviously expanded, the heat conduction oil overflowing through expansion enters the elastic telescopic oil storage tank through a pipeline, the heat conduction oil is cooled and shrunk in volume after the machine is stopped, and the heat conduction oil in the elastic telescopic oil storage tank reversely flows back to the rotary heat conduction oil boiler. Raw material lignite enters a tube dryer through a lignite feeding device, and under the heating of 300-DEG C high temperature of a tube bundle, crystalline internal water in the lignite is quickly pyrolyzed and converted into common water to escape from the lignite and be evaporated. Lignite is heating dry in-process, constantly overturns in rotatory slope barrel and gives off steam, and the low-speed removes to the discharge opening simultaneously, and lignite after the drying falls into through the discharge opening at last and receives the dry processing of material storehouse completion. High-temperature furnace gas generated by the burner is blown to the outer surface of the tubular dryer through the hot flue gas transmission pipeline after being discharged from the rotary heat-conducting oil boiler, the temperature loss of the tubular dryer caused by the lignite processing process is compensated by utilizing waste heat, and the purpose of reducing the hot flue gas is achieved. The cooled flue gas passes through a medium-temperature flue gas conveying pipeline, is injected into the tube nest dryer through a central flue gas conveying pipeline, then carries steam evaporated by lignite in the tube nest dryer, and enters a dust removal and condensate water recovery system from the other end of the tube nest dryer.
The indirect heating process of the invention and the existing tubular dryer has the following different characteristics:
1. in the existing tube array drying process, a boiler and a tube array dryer adopt a split structure, and hot steam generated by a fixed boiler is injected into a tube bundle of a rotating tube array dryer through a rotary joint. Because the rotary joint can not seal high-temperature high-pressure steam, the existing tubular dryer can only adopt low-pressure low-temperature steam with the temperature lower than 180 ℃ to heat, can not reach the temperature required by the rapid pyrolysis process of the crystalline internal water in the lignite with the temperature of 250 ℃, and can not meet the technical requirements of coal chemical industry and the deep removal of the internal water of atomized pulverized coal. The invention is characterized in that a rotary heat-conducting oil boiler is adopted, the rotary heat-conducting oil boiler and a tube array dryer are connected to synchronously rotate, a direct-connected pipeline is used for replacing a rotary joint, the technical problem that the rotary joint cannot seal high-pressure steam and high-temperature heat-conducting oil is solved, and a brand-new technical scheme is provided for removing water in the lignite crystalline state at high temperature by using a rotary tube array drying process.
2. The existing heat conduction oil boiler adopts a ground fixed installation structure and adopts a high-level oil groove to store heating media overflowing by heat conduction oil heating expansion. Because the heat conducting oil is oxidized and deteriorated rapidly when meeting air in a high-temperature state, a water sealing device capable of isolating external air needs to be added to the high-level oil groove. The invention is characterized in that the elastic expansion sealed oil storage tank is adopted to replace a high-level oil groove and a water seal device, the structure is simplified, and the process requirements of storing and isolating air of heat expansion overflowing heat conduction oil in a rotary sealed pipeline are met.
3. In the existing rotary tube array drying process, hot steam is generally adopted as a heat transfer medium. Due to steam loss, the boiler must be equipped with an industrial water softening process and an automatic water replenishing device. The invention has the different characteristics that the heat conducting oil is adopted as a heat transfer medium, and the heat conducting oil in the sealed pipeline can stably circulate for a long time without being supplemented at the high temperature of 300 ℃, so that a special soft water processing and supplementing system of a steam boiler can be cancelled, and the system structure is simplified.
The beneficial effects of the invention are as follows:
1. the integrated device of the rotary heat conduction oil boiler tube dryer adopts a direct connection structure of the rotary heat conduction oil boiler and the tube dryer, overcomes the structural defect that a rotary joint cannot convey high-pressure and high-temperature heating media, can convey the heat transfer media with the temperature of more than 300 ℃ to the tube dryer, heats lignite to the optimal crystal water pyrolysis temperature of 280 ℃, solves the industrial problem of deep dehydration of lignite, and provides a brand new technical scheme capable of realizing low-cost large-scale production for the processing of a new generation of clean fuel of coal chemical industry and atomized coal powder.
2. The integrated device of the rotary heat-conducting oil boiler tube dryer adopts an integrated structure that the boiler and the dryer are directly connected, so that the heat energy loss of long-distance transmission of a split structure is avoided, the heat energy efficiency of the system can be improved by about 10 percent, and the energy consumption is reduced.
3. The integrated lignite drying device of the rotary heat-conducting oil boiler tube dryer adopts heat-conducting oil to replace steam as a heat-conducting medium, so that the long-term consumption of water resources and the softening treatment cost can be reduced, and the operation cost is reduced.
4. The integrated device of the rotary heat-conducting oil boiler tube array dryer has the advantages that the structure is simplified and compact, the manufacturing cost and the operation cost of equipment are reduced, the occupied area of the equipment is far smaller than that of a split system, and the capital construction investment cost can be greatly reduced.
Drawings
FIG. 1 is a schematic process flow diagram of the integrated device of the tubular dryer of the rotary heat transfer oil boiler of the present invention.
Wherein: the method comprises the following steps of 1-a combustor, 2-a rotary heat conducting oil boiler, 3-a heat conducting oil circulating pump, 4-a tubular dryer, 5-a heat conducting oil return pipeline, 6-an elastic telescopic sealed oil storage tank, 7-a lignite feeding device, 8-a discharging opening, 9-a receiving bin, 10-a hot flue gas transmission pipeline, 11-an intermediate temperature flue gas transmission pipeline, 12-a central flue gas transmission pipeline, 13-an evaporation tail gas discharge pipeline, 14-a dust removal and condensate water recovery system, 15-a barrel rotating motor and 16-a barrel rotating carrier roller.
Detailed Description
In order to understand the technical features of the present invention, an embodiment of the present invention is described below with reference to fig. 1 of the accompanying drawings.
The burner (1) used in the integrated device of the rotary heat-conducting oil boiler tube dryer can be any one of pulverized coal, fuel oil and gas burners. The burner is used for generating high-temperature and high-speed oxygen-lacking gas flow to heat transfer oil of a heat transfer medium in a tube bundle of the rotary heat transfer oil boiler (2), and the temperature of the heat transfer oil is controlled to be in the range of 280-300 ℃ which is the optimal range for lignite dehydration. High-temperature heat-conducting oil is directly injected into a tube bundle of the tube still dryer (4) by using the heat-conducting oil circulating pump (3). The heat carried by the heat conducting oil is conducted to the lignite in the barrel of the tubular drier (4) through the tube bundle of the tubular drier (4). After the heat of the heat conduction oil is released, the heat conduction oil returns to the rotary heat conduction oil boiler (2) through a heat conduction oil return pipeline (5), and a continuous working cycle is formed.
The lignite to be processed is conveyed into the tubular drier (4) through the lignite feeding device (7), the lignite is gradually heated to the range of the optimal pyrolysis temperature of 250-280 ℃ of water in the lignite crystalline state by utilizing the heat of a tube bundle in the tubular drier (4), and the water in the lignite crystalline state is quickly pyrolyzed into common water and escapes from the interior of the lignite. The integrated lignite drying device of the rotary heat-conducting oil boiler tube dryer is obliquely arranged according to an inclination angle of 5 degrees, is driven by a cylinder rotating motor (15), and rotates above a cylinder rotating carrier roller (16). In the rotation process of the cylinder of the tubular dryer (4), lignite in the cylinder continuously rolls, surface water, interstitial water and pyrolyzed internal water contained in the lignite are vaporized and evaporated in an environment of 250 degrees, the lignite continuously moves in the inclined cylinder at the same time, and finally falls into a receiving bin (9) through a discharge opening (8), and the dehydration and drying processing is finished.
High-temperature furnace gas generated by the combustor (1) is discharged from the rotary heat-conducting oil boiler (2), and then is blown to the outer surface of the tubular column dryer (4) through a hot flue gas transmission pipeline (10), so that the temperature loss caused by the fact that low-temperature raw materials enter the tubular column dryer (4) is compensated by utilizing flue gas waste heat, and meanwhile, the temperature of hot flue gas is reduced. The cooled medium-temperature flue gas passes through a medium-temperature flue gas transmission pipeline (11) and a central flue gas transmission pipeline (12) and is injected into the tube nest dryer (4). The medium temperature flue gas carries water vapor and dust evaporated by the lignite in the tubular dryer (4) into a dedusting and condensed water recovery system (14). The flue gas after dust removal is discharged after being processed by other systems, and the condensed water is recycled for other systems to recycle.
The present invention is not limited to the above-described range of use and specific method of use, and various partial structural modifications, changes in use, parameters and method of use may be made within the technical scope of the present invention, and these modifications and changes are included in the scope of protection of the present invention.
Claims (6)
1. A rotary heat-conducting oil boiler tube array dryer integrated device for deep dehydration and drying of lignite is characterized by comprising a burner, a rotary heat-conducting oil boiler and a tube array dryer; the rotary heat conduction oil boiler comprises heat conduction oil, and high-temperature furnace gas generated by the burner is sprayed into a boiler body of the rotary heat conduction oil boiler to heat the heat conduction oil; the rotary heat conduction oil boiler and the tube array dryer adopt an integrated direct connection structure; the rotary heat conduction oil boiler adopts a rotary structure and a rotary working mode, the rotary heat conduction oil boiler tube dryer integrated device adopts heat conduction oil as a heat transfer medium, the heat conduction oil is heated by the rotary heat conduction oil boiler and then directly injected into a tube bundle in the tube dryer through a heat conduction oil circulating pump, the heat carried by the heat is transferred to lignite in the tube dryer through the tube bundle, and then the heat is returned to the rotary heat conduction oil boiler through a heat conduction oil return pipeline; the heat conduction oil overflowing from the heat conduction oil boiler after being heated and expanded in volume enters the elastic telescopic sealed oil storage tank, and returns to the heat conduction oil boiler through the elastic telescopic sealed oil storage tank when the temperature is reduced and the volume is contracted; the raw material to be processed is fed into a tube dryer through a lignite feeding device, and is heated to 250-280 ℃ through a tube bundle of the tube dryer, the crystalline internal water in the lignite is quickly pyrolyzed and overflows at the temperature, and is evaporated with the external water at the same time and discharged through an evaporation tail gas discharge pipeline, and the dehydrated and dried lignite enters a receiving bin through a discharge opening.
2. The integrated device of the rotary heat transfer oil boiler tube dryer of claim 1, further comprising a hot flue gas transmission pipeline, wherein the hot flue gas transmission pipeline is connected with the rotary heat transfer oil boiler and the tube dryer; and after being discharged from the rotary heat conducting oil boiler, the high-temperature furnace gas generated by the burner is blown to the outer surface of the tube nest dryer through the hot flue gas transmission pipeline.
3. The integrated device of the rotary conduction oil boiler tube dryer of claim 2, further comprising a medium-temperature flue gas transmission pipeline, a central flue gas transmission pipeline and a dedusting and condensate water recovery system, wherein one end of the medium-temperature flue gas transmission pipeline is connected to the flue gas transmission pipeline, the other end of the medium-temperature flue gas transmission pipeline is connected to the central flue gas transmission pipeline, the central flue gas transmission pipeline is connected with one end of the tube dryer, which is far away from the evaporation tail gas discharge pipeline, and the dedusting and condensate water recovery system is connected with the evaporation tail gas discharge pipeline at the other end of the tube dryer;
the medium-temperature flue gas flowing out of the hot flue gas transmission pipeline passes through the medium-temperature flue gas transmission pipeline and is injected into the tubular column dryer through the central transmission pipeline, and the steam and the dust evaporated by the lignite in the tubular column dryer are carried to enter the dedusting and condensate water recovery system through the evaporation tail gas discharge pipeline.
4. The integrated device of the tube array dryer of the rotary heat transfer oil boiler according to claim 1, wherein the rotary heat transfer oil boiler and the tube array dryer adopt a synchronous rotation mode, and heat transfer oil is directly injected into a tube bundle of the tube array dryer through a direct-connected pipeline.
5. The integrated device of the tube row dryer of the rotary heat transfer oil boiler according to claim 1, wherein heat transfer oil is adopted as a heat transfer medium of the tube row dryer, and the working temperature of 300 ℃ is maintained in a normal pressure state.
6. The integrated device of the tube-in-tube dryer of the rotary conduction oil boiler according to claim 1, wherein an elastic telescopic sealed oil storage tank is used for storing heat transfer media overflowing due to thermal expansion.
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| CN202010690401.XA CN111678311B (en) | 2020-07-17 | 2020-07-17 | Rotary heat-conducting oil boiler tube array dryer integrated device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005201511A (en) * | 2004-01-15 | 2005-07-28 | Tsukishima Kikai Co Ltd | Rotary heat treatment equipment and its operation method |
| CN2729607Y (en) * | 2004-09-14 | 2005-09-28 | 陈和平 | Rotating cylinder drying equipment |
| DK2249113T3 (en) * | 2009-05-08 | 2018-10-22 | Kumera Oy | steam dryer |
| CN201748772U (en) * | 2010-08-09 | 2011-02-16 | 袁文斌 | Rotary type heat superconductive drying tube directly using energy for outer heating not using steam or heat conductive oil |
| CN102374756B (en) * | 2010-08-24 | 2015-01-21 | 绍兴县东森印染有限公司 | Heat transfer oil-based heat transfer type drying cylinder |
| CN202452800U (en) * | 2011-09-26 | 2012-09-26 | 四川普什醋酸纤维素有限责任公司 | Pipe drier |
| CN202304284U (en) * | 2011-09-26 | 2012-07-04 | 四川普什醋酸纤维素有限责任公司 | Steam pipe drum dryer |
| CN102393130B (en) * | 2011-11-26 | 2013-12-11 | 山东科院天力节能工程有限公司 | Auxiliary heating type steam rotary dryer |
| CN103256798B (en) * | 2013-05-06 | 2015-05-27 | 西安交通大学 | Pulverized coal drying device and system |
| CN103591779B (en) * | 2013-11-20 | 2015-10-07 | 韩旭新 | Brown coal pipe drier |
| JP5778831B1 (en) * | 2014-03-31 | 2015-09-16 | 月島機械株式会社 | Method of drying workpiece and horizontal rotary dryer |
| CN105157371A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Revolving drum type fume-steam integrated raw coal drying equipment |
| CN105614021A (en) * | 2015-12-28 | 2016-06-01 | 杨彦红 | Method and equipment for drying and fermenting feed at low temperature |
| CN105737548A (en) * | 2016-04-30 | 2016-07-06 | 张海娟 | Heat tube type drum dryer |
| CN109682167B (en) * | 2018-12-13 | 2019-10-29 | 中国矿业大学 | A kind of low-order coal drying and upgrading integration apparatus and method |
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