CN214140648U - Improve likepowder coal rotary furnace drying quality's hierarchical feeding device - Google Patents
Improve likepowder coal rotary furnace drying quality's hierarchical feeding device Download PDFInfo
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Abstract
The utility model relates to a chemical engineering feeding equipment technical field for improve heat transfer efficiency, single-furnace productivity, drying quality, concretely relates to improve hierarchical feeding device of likepowder coal rotary furnace drying quality, including connecting the horizontal gyration drum on the supporting seat, connect drive mechanism and discharge mechanism on the horizontal gyration drum, connect the steam tubulation in the horizontal gyration drum, set up the condensate outlet on the steam tubulation, the pan feeding end of horizontal gyration drum connects coarse grain coal inlet pipe, the discharge end connects medium grain coal inlet pipe, the fine grain coal inlet pipe, coarse grain coal inlet pipe, medium grain coal inlet pipe, all be connected with coal spiral feeder in the fine grain coal inlet pipe, be provided with the carrier gas entry on the coarse grain coal inlet pipe, be provided with first low pressure steam inlet on the steam tubulation; the charging process comprises the working procedures of screening coal, adding coarse-grained coal, adding medium-grained coal and fine-grained coal, drying and discharging; the yield and the quality of the coal rotary furnace are improved.
Description
Technical Field
The utility model relates to a chemical engineering feeding equipment technical field for improve the heat transfer efficiency of coal in the rotary furnace, improve single stove productivity and coal drying quality, concretely relates to improve likepowder coal rotary furnace drying quality's hierarchical feeding device.
Background
The drying process of coal is a process of evaporating and discharging moisture in coal by heating, the drying of moisture-containing coal is a process of moving moisture from the inside of lump coal to the surface after the coal is heated, changing the moisture from a liquid state to a vapor state, and then moving the moisture from the surface of the coal to a surrounding gas medium, and the drying process of coal is a comprehensive process of heat transfer and mass transfer:
(1) the heat transfer process of coal drying: the method comprises the steps that a drying medium transfers heat to the surface of coal in a convection heat transfer mode, and the heat on the surface of the coal is transferred to the interior of the coal in a conduction mode; after the surface of coal is heated, water is vaporized and evaporated, and liquid water is changed into gaseous steam;
(2) coal drying external diffusion process: water vapor diffuses into the drying medium through the boundary layer on the surface of the coal;
(3) internal diffusion process of coal drying: moisture diffuses from the inside of the coal to the surface of the coal.
When the coal is dried, the three processes are carried out simultaneously.
In a rotary drying furnace for indirectly heating coal, the coal is not directly contacted with a heating medium, a high-temperature medium carries out indirect heat transfer to wet coal through a solid wall, and wet steam generated in the drying process is discharged out of the drying furnace by adopting methods such as negative pressure suction or introducing a small amount of carrier gas in the furnace.
According to different structural forms of heat exchange wall surfaces in rotary furnaces, rotary drying furnaces can be divided into external heating rotary furnaces and tubular rotary furnaces. The external heating type rotary furnace generally adopts hot flue gas to heat the outer wall of a rotary furnace cylinder body, and materials in the rotary furnace cylinder body are heated and dried through the cylinder wall; the tubular rotary furnace is a structural form of an external heating type rotary furnace, and coal in a cylinder body of the rotary furnace is heated and dried through a plurality of heating pipes arranged in the cylinder body.
The main body of the coal steam drying rotary furnace is a horizontal rotary cylinder, 2-5 circles of heating pipes penetrating through the whole cylinder are arranged in the cylinder in a concentric circle mode along the length direction of the furnace, the heating pipes are fixed on the cylinder wall through a fixing frame and rotate along with the cylinder, and the cylinder is installed in an inclined mode that a feeding end is high and a discharging end is low. After the coal is added into the cylinder body, the coal is continuously lifted and rolled down along with the rotation of the cylinder body, and heat is transferred between the coal and the heating pipe. The steam drying rotary furnace utilizes steam heat to indirectly transfer heat to coal, heating steam is introduced into the tube nest from the feeding end of the rotary furnace through the steam chamber, the coal is added into the cylinder from the feeding end of the rotary furnace, the steam in the cylinder is fed into the inner side of the tube nest, the coal is fed into the outer side of the tube nest, and wet coal and the wall of the steam tube are in contact heat exchange. In the process of rotating the rotary furnace barrel, in the process of moving coal to the direction of the discharge end, water in the coal absorbs heat and is gasified and evaporated, when the coal flows to the discharge end of the rotary furnace, the water content meets the requirement, and the dried coal is discharged from the discharge end of the rotary furnace and enters the next procedure for continuous treatment. Condensate generated after steam heat exchange enters a moisture recovery system for cyclic utilization, air carried in coal and water vapor generated in drying are discharged from the upper part of the discharge end of the rotary furnace, and then enter a tail gas treatment system for moisture recovery. In order to increase the drying rate of the rotary kiln in the drying process, a stream of moisture-carrying gas is generally introduced into the cylinder and used as a moisture carrier gas carrying steam, so that moisture removed in the coal drying process can be quickly discharged out of the rotary kiln. FIG. 2 is a view showing the conventional structure of a rotary kiln for drying coal.
The main problems existing in the existing coal drying rotary furnace are as follows:
(1) when coal with smaller particle size is dried in a rotary furnace, because gaps among coal bed particles are smaller and the contact area between the particles is small, the internal radiation heat transfer quantity of the coal bed is smaller and the conduction heat transfer resistance is larger, the heat absorbed by the surface of the coal bed is difficult to transfer to the middle of the coal bed, and the quality of the coal in the drying process is uneven;
(2) when the granularity of coal dried by the rotary furnace is fine, the porosity among coal particles is small, and water vapor discharged by drying pulverized coal in a coal bed is difficult to discharge from the inside of a material bed, so that the drying quality of the coal is greatly influenced;
(3) in the drying process of the coal rotary furnace, coal with larger granularity needs longer drying time at a certain drying temperature, while coal with smaller granularity needs shorter drying time, and when the granularity range of the dried coal is larger, the phenomena of uneven drying quality and lower single-furnace yield of the coal are easy to occur.
SUMMERY OF THE UTILITY MODEL
The application provides a grading feeding device for improving the drying quality of a powdery coal rotary furnace, which aims at solving the problems of low coal heat exchange efficiency, long drying time, low single-furnace yield and incomplete drying of large-particle coal in the existing coal rotary furnace during drying the coal.
In order to realize the above-mentioned purpose, the utility model provides an improve likepowder coal rotary furnace drying quality's feeding device in grades, coal rotary furnace are including connecting the horizontal gyration drum on the supporting seat, be connected with drive mechanism and discharge mechanism on the horizontal gyration drum, horizontal gyration drum in-connection has the steam tubulation, be provided with the condensate outlet on the steam tubulation, the pan feeding end of horizontal gyration drum is connected with the coarse grain coal inlet pipe, and the discharge end is connected with middlings coal inlet pipe, fine grain coal inlet pipe, all be connected with coal spiral feeder in coarse grain coal inlet pipe, the middlings coal inlet pipe, the fine grain coal inlet pipe, be provided with the carrier gas entry on the coarse grain coal inlet pipe, be provided with first low pressure steam entry on the steam tubulation.
Wherein, the coarse coal feeding pipe, the medium coal feeding pipe and the fine coal feeding pipe are all provided with coal inlets.
Furthermore, the transmission mechanism comprises transmission wheels connected to the horizontal rotary cylinder, the support seat is connected with a motor, an output shaft of the motor is also connected with the transmission wheels, and a transmission belt is connected between the two transmission wheels. The driving wheel connected to the output shaft of the motor is rotated by the rotation of the output shaft of the motor, so that power is transmitted to the driving wheel on the horizontal rotary cylinder through the driving belt, and the horizontal rotary cylinder is rotated.
Further, discharge mechanism is including gathering the workbin, gather the workbin in-connection and be connected with the spiral steam pipe, spiral steam pipe one end sets up second low pressure steam inlet, and the other end is provided with the saturated water export, gather the workbin top and be provided with the carrier gas export that contains moisture, the bottom is provided with dry fine coal export. And the coal dried in the horizontal rotary cylinder enters the material collecting box and is discharged through a dried pulverized coal outlet at the bottom of the material collecting box.
Further, the medium coal feed pipe extends to a middle position of the horizontal rotary drum, and the fine coal feed pipe extends to a rear position of the horizontal rotary drum.
The application provides a improve likepowder coal rotary furnace drying quality's feeding process of hierarchical feeding device, specifically includes the following step:
step 1: screening coal: before coal is added into a horizontal rotary cylinder for drying, the coal is divided into fine-grained coal, medium-grained coal and coarse-grained coal by adopting a vibrating screen;
step 2: addition of coarse coal: adding coarse-grained coal into a coarse-grained coal feeding pipe connected to a feeding end of a horizontal rotary cylinder, wherein the coarse-grained coal gradually moves from the feeding end to a discharging end in the rotation process of the horizontal rotary cylinder and exchanges heat with a steam tube and furnace gas in the horizontal rotary cylinder, and the temperature of the coal gradually rises while water is discharged; and step 3: addition of medium-grain coal and fine-grain coal: respectively adding medium coal and fine coal into a medium coal feeding pipe and a fine coal feeding pipe which are connected to the discharge end of the horizontal rotary cylinder, adding the medium coal into the middle position in the furnace, and adding the fine coal into the rear position in the furnace;
and 4, step 4: and (3) drying: in the horizontal rotary cylinder, when coal of different grain sizes rotates along with the furnace body in the furnace and gradually flows to the discharge end, the coal of different grain sizes can be uniformly dried by controlling different roasting time of the coal of different grain sizes in the furnace;
and 5: discharging: when the coal flows to the discharge end of the horizontal rotary cylinder, the coal meeting the drying quality requirement is discharged from the discharge end of the rotary furnace, and the discharged material is the dried coal.
The particle size range of the coal is 0-30mm, the particle size of the fine coal is 0-3mm, the particle size of the medium coal is 3-10 mm, and the particle size of the coarse coal is 10-30 mm.
Wherein the vibrating screen comprises a 3mm vibrating screen and a 10mm vibrating screen.
The particle size range of the coal also comprises 0-100 mm, and the corresponding coal particle size is classified into 3-5 different particle size ranges according to the drying characteristics of the coal.
The technical scheme of the application has the following principle of adding the rotary furnace front particle size classification: in the drying of coal, powdered coal with the particle size of less than 30mm is generally dried by a rotary furnace, in the coal with the particle size of 0-30mm, the coal with the particle size of 0-3mm has higher ratio, and because the specific surface of the coal with small particle size is large, the heat transfer efficiency and the drying thermal resistance are smaller, the heat transfer speed is high in the drying process, the water in particles is easily discharged, the required drying temperature is low, and the drying time is shorter; the specific surface of the coal with large particle size is small, the heat transfer efficiency is low, the drying resistance is large, the distance for transferring heat from the surface of the particles to the central part and transferring water at the central part to the surface of the particles and discharging the water is long in the drying process, the drying temperature required by the coal is high, and the drying time is long; meanwhile, in the coal with the size of 0-30mm, small-particle coal occupies gaps among large-particle coal, and the heat transfer and mass transfer processes in the coal material layer are influenced.
The technical scheme of the application is that the grading charging process for improving the drying quality of the powdery coal rotary furnace comprises the following steps: before coal in the size fraction range of 0-30mm is added into a rotary furnace for drying, a 3mm vibrating screen and a 10mm vibrating screen are adopted to respectively enable the coal granularity to be 0-3mm fine-grained coal, 3-10 mm medium-grained coal and 10-30 mm coarse-grained coal, then the coarse-grained coal is added into a feeding end of the rotary furnace through a coal spiral conveyor, the coarse-grained coal gradually moves from the feeding end to a discharging end in the rotary furnace rotating process and exchanges heat with a tube array and furnace gas in the rotary furnace, and the coal temperature gradually rises and simultaneously discharges water; at the discharge end of the rotary furnace, a long-stroke spiral conveyor is adopted to convey medium-grained coal to the middle position in the furnace, and a short-stroke spiral conveyor is adopted to convey fine-grained coal to the rear position in the furnace; when coal of different size fractions rotates along with the furnace body in the furnace and gradually moves to the discharge end, the coal of different sizes can be uniformly dried by controlling different roasting time of the coal of different size fractions in the furnace. When coal flows to the discharge end in the rotary furnace, the coal which meets the drying quality is discharged from the discharge end.
To sum up, the utility model discloses compare in prior art's beneficial effect and be:
(1) according to the method, the coals with different granularity are added from different parts of the rotary furnace according to different drying time required by drying the coals with different granularity in the rotary furnace, and the yield and the quality of the rotary furnace can be improved by controlling different drying time for the coals with different granularity;
(2) according to the method, 10-30 mm coarse coal is added from the feeding end of the rotary furnace, and due to the fact that the 10-30 mm coarse coal is large in granularity and certain gaps are formed among the coals, the radiation heat transfer quantity in the coal can be improved while the conduction heat transfer quantity in the coal is improved, and drying of the 10-30 mm coarse coal is facilitated;
(3) after this application is added coarse grain coal from the rotary kiln pan feeding end, more space can appear on the particle surface because of the discharge of moisture in the rotary kiln front half section drying process of coal, then after adding medium grain coal, fine grain coal into the rotary kiln again, can improve the gas permeability of coal seam inside to improve the drying efficiency of coal.
Drawings
FIG. 1 is a schematic structural view of a staged feeding device for improving drying quality of a rotary kiln for pulverized coal of the present invention;
FIG. 2 is a schematic structural view of a conventional rotary coal drying furnace;
FIG. 3 is a flow chart of the classified charging process of the classified charging device for improving the drying quality of the powdery coal rotary furnace.
Labeled as: 1-coal inlet, 2-coarse coal feeding pipe, 3-driving belt, 4-middle position, 5-rear position, 6-second low-pressure steam inlet, 7-moisture-containing carrier gas outlet, 8-first low-pressure steam inlet, 9-medium coal feeding pipe, 10-fine coal feeding pipe, 11-condensed water outlet, 12-saturated water outlet, 13-dried pulverized coal outlet, 14-collecting box, 15-horizontal rotary cylinder, 16-steam array pipe, 17-motor, 18-driving wheel, 19-supporting seat and 20-carrier gas inlet.
Detailed Description
All features disclosed in this specification may be combined in any combination, except features and/or steps that are mutually exclusive.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to fig. 1 to 3 and specific examples.
Example 1
Referring to fig. 1-3, the utility model provides an improve likepowder coal rotary furnace drying quality's feeding device in grades, including connecting horizontal gyration drum 15 on supporting seat 19, be connected with drive mechanism and discharge mechanism on the horizontal gyration drum 15, it has steam tubulation 16 to connect in the horizontal gyration drum 15, be provided with condensate outlet 11 on the steam tubulation 16, the pan feeding end of horizontal gyration drum 15 is connected with coarse grain coal inlet pipe 2, the discharge end is connected with middlings coal inlet pipe 9, fine grain coal inlet pipe 10, coarse grain coal inlet pipe 2, middlings coal inlet pipe 9, all be connected with coal screw feeder in the fine grain coal inlet pipe 10, be provided with carrier gas entry 20 on the coarse grain coal inlet pipe 2, be provided with first low pressure steam entry 8 on the steam tubulation 16.
Wherein, the coarse coal feeding pipe 2, the medium coal feeding pipe 9 and the fine coal feeding pipe 10 are all provided with coal inlets 1.
Example 2
Based on embodiment 1, referring to fig. 1-3, the transmission mechanism of this embodiment includes a transmission wheel 18 connected to a horizontal rotary cylinder 15, a motor 17 connected to a support base 19, a transmission wheel 18 connected to an output shaft of the motor 17, and a transmission belt 3 connected between the two transmission wheels 18.
The transmission wheel 18 connected to the output shaft of the motor 17 is rotated by the rotation of the output shaft of the motor 17, so that the power is transmitted to the transmission wheel 18 on the horizontal type rotary drum 15 through the transmission belt 3, thereby rotating the horizontal type rotary drum 15.
Example 3
Based on embodiment 1, referring to fig. 1-3, the discharging mechanism of this embodiment includes a material collecting box 14, a spiral steam pipe is connected in the material collecting box 14, one end of the spiral steam pipe is provided with a second low-pressure steam inlet 6, the other end is provided with a saturated water outlet 12, the top of the material collecting box 14 is provided with a humid carrier gas outlet 7, and the bottom is provided with a dried pulverized coal outlet 13.
The coal dried in the horizontal rotary cylinder 15 enters the material collecting box 14 and is discharged through a dried pulverized coal outlet 13 at the bottom of the material collecting box 14.
Example 4
Referring to fig. 1-3, a medium coal feed pipe 9 of this embodiment extends to a middle position 4 of horizontal rotary drum 15 and a fine coal feed pipe 10 extends to a rear position 5 of horizontal rotary drum 15, based on embodiment 1.
Example 5
A charging process of a grading charging device for improving the drying quality of a powdery coal rotary furnace specifically comprises the following steps:
step 1: screening coal: before coal is added into a horizontal rotary cylinder 15 for drying, the coal is divided into fine-grained coal, medium-grained coal and coarse-grained coal by adopting a vibrating screen;
step 2: addition of coarse coal: adding coarse-grained coal into a coarse-grained coal feeding pipe 2 connected to the feeding end of the horizontal rotary drum 15, wherein the coarse-grained coal gradually moves from the feeding end to the discharging end in the rotation process of the horizontal rotary drum 15 and exchanges heat with a steam array pipe 16 and furnace gas in the horizontal rotary drum 15, and the temperature of the coal is gradually increased while water is discharged;
and step 3: addition of medium-grain coal and fine-grain coal: respectively adding medium-grain coal and fine-grain coal into a medium-grain coal feeding pipe 9 and a fine-grain coal feeding pipe 10 which are connected to the discharging end of a horizontal rotary drum 15, adding the medium-grain coal into a middle position 4 in the furnace, and adding the fine-grain coal into a rear position 5 in the furnace;
and 4, step 4: and (3) drying: in the horizontal rotary cylinder 15, when coal of different grain sizes rotates along with the furnace body in the furnace and gradually flows to the discharge end, the coal of different grain sizes can be uniformly dried by controlling different roasting time of the coal of different grain sizes in the furnace;
and 5: discharging: when the coal flows to the discharge end of the horizontal rotary cylinder 15, the coal meeting the drying quality requirement is discharged from the discharge end of the rotary furnace, and the discharged material is the dried coal.
The particle size range of the coal is 0-30mm, the particle size of the fine coal is 0-3mm, the particle size of the medium coal is 3-10 mm, and the particle size of the coarse coal is 10-30 mm; the vibrating screen comprises a 3mm vibrating screen and a 10mm vibrating screen; the granularity range of the coal also comprises 0-100 mm, and the corresponding granularity of the coal is classified into 3-5 different size fractions according to the drying characteristics of the coal.
The technical scheme of the application has the following principle of adding the rotary furnace front particle size classification: in the drying of coal, powdered coal with the particle size of less than 30mm is generally dried by a rotary furnace, in the coal with the particle size of 0-30mm, the coal with the particle size of 0-3mm has higher ratio, and because the specific surface of the coal with small particle size is large, the heat transfer efficiency and the drying thermal resistance are smaller, the heat transfer speed is high in the drying process, the water in particles is easily discharged, the required drying temperature is low, and the drying time is shorter; the specific surface of the coal with large particle size is small, the heat transfer efficiency is low, the drying resistance is large, the distance for transferring heat from the surface of the particles to the central part and transferring water at the central part to the surface of the particles and discharging the water is long in the drying process, the drying temperature required by the coal is high, and the drying time is long; meanwhile, in the coal with the size of 0-30mm, small-particle coal occupies gaps among large-particle coal, and the heat transfer and mass transfer processes in the coal material layer are influenced.
The technical scheme of the application is that the grading charging process for improving the drying quality of the powdery coal rotary furnace comprises the following steps: before coal in the size fraction range of 0-30mm is added into a rotary furnace for drying, a 3mm vibrating screen and a 10mm vibrating screen are adopted to respectively enable the coal granularity to be 0-3mm fine-grained coal, 3-10 mm medium-grained coal and 10-30 mm coarse-grained coal, then the coarse-grained coal is added into a feeding end of the rotary furnace through a coal spiral conveyor, the coarse-grained coal gradually moves from the feeding end to a discharging end in the rotary furnace rotating process and exchanges heat with a tube array and furnace gas in the rotary furnace, and the coal temperature gradually rises and simultaneously discharges water; at the discharge end of the rotary furnace, a long-stroke spiral conveyor is adopted to convey medium-grained coal to the middle position 4 in the furnace, and a short-stroke spiral conveyor is adopted to convey fine-grained coal to the rear position 5 in the furnace; when coal of different size fractions rotates along with the furnace body in the furnace and gradually moves to the discharge end, the coal of different sizes can be uniformly dried by controlling different roasting time of the coal of different size fractions in the furnace. When coal flows to the discharge end in the rotary furnace, the coal which meets the drying quality is discharged from the discharge end.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (4)
1. The grading feeding device for improving the drying quality of the powdery coal rotary furnace comprises a horizontal rotary cylinder (15) connected onto a supporting seat (19), wherein a transmission mechanism and a discharge mechanism are connected onto the horizontal rotary cylinder (15), a steam array pipe (16) is connected into the horizontal rotary cylinder (15), and a condensed water outlet (11) is formed in the steam array pipe (16), and is characterized in that a coarse coal feeding pipe (2) is connected to a feeding end of the horizontal rotary cylinder (15), a medium coal feeding pipe (9) and a fine coal feeding pipe (10) are connected to a discharge end of the horizontal rotary cylinder (15), coal spiral conveying machines are connected into the coarse coal feeding pipe (2), the medium coal feeding pipe (9) and the fine coal feeding pipe (10), and a carrier gas inlet (20) is formed in the coarse coal feeding pipe (2), the steam tube nest (16) is provided with a first low-pressure steam inlet (8).
2. The staged feeding device for improving drying quality of a pulverized coal rotary kiln as claimed in claim 1, wherein said transmission mechanism comprises a transmission wheel (18) connected to a horizontal rotary cylinder (15), said supporting base (19) is connected with a motor (17), an output shaft of said motor (17) is also connected with a transmission wheel (18), and a transmission belt (3) is connected between two said transmission wheels (18).
3. The staged feeding device for improving drying quality of a pulverized coal rotary furnace according to claim 1, wherein the discharging mechanism comprises a material collecting box (14), a spiral steam pipe is connected in the material collecting box (14), one end of the spiral steam pipe is provided with a second low-pressure steam inlet (6), the other end of the spiral steam pipe is provided with a saturated water outlet (12), the top of the material collecting box (14) is provided with a moisture-containing carrier gas outlet (7), and the bottom of the material collecting box is provided with a dried pulverized coal outlet (13).
4. A staged feeding device for improving drying quality of a rotary kiln for pulverized coal as claimed in claim 1, characterized in that the medium coal feeding pipe (9) extends to a middle position (4) of the horizontal rotary drum (15) and the fine coal feeding pipe (10) extends to a rear position (5) of the horizontal rotary drum (15).
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| CN112278895A (en) * | 2020-09-25 | 2021-01-29 | 酒泉钢铁(集团)有限责任公司 | Grading feeding device for improving drying quality of powdery coal rotary furnace and feeding process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112278895A (en) * | 2020-09-25 | 2021-01-29 | 酒泉钢铁(集团)有限责任公司 | Grading feeding device for improving drying quality of powdery coal rotary furnace and feeding process thereof |
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