CN110762998A - Coal dryer, coal drying system and coal drying method - Google Patents
Coal dryer, coal drying system and coal drying method Download PDFInfo
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- CN110762998A CN110762998A CN201911049456.6A CN201911049456A CN110762998A CN 110762998 A CN110762998 A CN 110762998A CN 201911049456 A CN201911049456 A CN 201911049456A CN 110762998 A CN110762998 A CN 110762998A
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- coal
- steam
- drying
- secondary steam
- heat exchange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
- F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
- F26B17/1408—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/005—Drying-steam generating means
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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
- F26B25/06—Chambers, containers, or receptacles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a coal dryer, which comprises an air locking feed port, a distribution bin connected with the air locking feed port, a heat exchange section connected with the distribution bin, and a discharge bin connected with the heat exchange section, wherein the discharge bin is provided with a discharge port, the distribution bin is provided with an explosion venting valve, the heat exchange section comprises a heat exchange device and a secondary steam lead-out external member, the secondary steam lead-out external member is provided with at least one layer, and each layer of secondary steam lead-out external member is provided with a secondary steam outlet. The invention also discloses a coal drying system and a coal drying method. The invention provides a solid drying mode without carrying moisture, and particularly provides a drying mode with low energy consumption and high safety for the field of coal drying and coking coal drying. The steam consumption in the drying process is reduced by more than 50 percent.
Description
Technical Field
The invention relates to a drying treatment method for coal in a coking process, in particular to a coal dryer, a coal drying system and a coal drying method, and belongs to the technical field of coking coal drying.
Background
The coking coal drying technology has developed various technical forms in China, such as rotary drying, fluidized drying and the like, and the drying modes consume a large amount of power and energy to maintain equipment or material operation while consuming heat energy. Under the same drying conditions, more additional energy is required and the steam evaporated during the drying process cannot be reused.
Although the energy consumption can be effectively reduced in the evaporation field through a multi-effect evaporation mode, and the steam circulation technology is a mature technology, in the aspect of solid drying, the steam circulation utilization technology is difficult to popularize and apply in the aspect of solid drying due to the fact that higher secondary steam saturation cannot be provided by using lower energy supply.
Therefore, a new process technology and equipment scheme are needed to provide guarantee for energy conservation and consumption reduction in the field.
Disclosure of Invention
The invention aims to solve the problem of high energy consumption caused by the fact that steam circulation technology cannot be used in the field of solid drying at present, particularly in the field of coking coal drying, and provides a coal drying machine without carrying moisture, a coal drying system and a coal drying method, so that feasibility is provided for the steam circulation technology to be applied to the field of coking coal drying.
The invention is realized by the following steps:
the utility model provides a coal drying machine, includes the lock gas feed inlet, the distribution storehouse that links to each other with the lock gas feed inlet, the heat transfer section that links to each other with the distribution storehouse, the play feed bin that links to each other with the heat transfer section is provided with the discharge gate on going out the feed bin, there is the explosion valve of letting out on the distribution storehouse, and the heat transfer section includes heat transfer device and secondary steam and derives the external member, and secondary steam derives the external member and has at least the one deck, and every layer of secondary steam derives the external member and is provided with a secondary.
The further scheme is as follows:
the secondary steam export external member includes a plurality of secondary steam external members, the secondary steam external member includes a conical broken arch hood, broken arch hood sub-unit connection negative pressure secondary steam pipe, and the negative pressure secondary steam pipe returns the blowpipe through pressure control valve and malleation secondary steam and links to each other, and the malleation secondary steam of a plurality of secondary steam external members returns the blowpipe and all links to each other with the secondary steam export.
In the invention, the blast cap of the air outlet is conical, and has an arch breaking effect. The gap interval between the conical blast cap and the blast pipe is considered for gas flowing, the lower end of the negative pressure blast pipe is connected with a pressure control valve, and the valve is connected with a pressure steam pipe below, so that back blowing is performed when blockage occurs. When the air pipe is blocked, the pressure in the negative pressure air pipe changes, the pressure controller receives signals and then opens the positive pressure steam blowback valve to form blowback injection, the valve is closed, and after dust blockage is removed, the pipeline returns to a negative pressure state and continues to remove steam.
The further scheme is as follows:
the number N of layers of the secondary steam deriving kit is determined according to the total height b of the drying section, the required drying retention time t and the comprehensive heat conducting value theta; and theta is an empirical number obtained from the drying rate of the coal obtained by a thin-layer drying test and the heat conductivity coefficient under the bulk material condition, and the value range of theta is 0-10. The empirical value is an empirical value determined experimentally from the relationship between the drying speed and the thermal conductivity curve.
When b/t is less than or equal to theta, N is 1
When b/t is larger than or equal to theta, N is equal to b/theta, and N is hoped to be rounded up. The dry height b is expressed in m, the time t is expressed in h, and θ is a dimensionless number.
The further scheme is as follows:
the distance a between two adjacent secondary steam deriving suites is equal to theta x t. The distance a between the steam lead-out assemblies is in m.
The further scheme is as follows:
the distance c between the heat exchange devices and the distance d between the internal intervals of the heat exchange devices are intervals formed by preventing materials from being bonded in the drying process. The value range of the composite material takes the equivalent diameter Dm and the maximum granularity Dmax of the material into consideration, and the comprehensive heat conduction value theta. The equivalent diameter Dm of the material is the diameter of the material under the condition that the coal is equivalent to the uniform material under the condition of full particle size. The interval value needs to be considered according to the following formula
Theta x t/n is more than or equal to c and more than or equal to d and less than or equal to 2 to 5 Dmax and Dmax/Dm
If the Dmax content is less than or equal to 2%, the interval can be designed according to the condition that theta multiplied by t/n is more than or equal to c and more than or equal to d and (5-8) Dm. The unit of Dm of the particle diameter is mm, and the units of c and d are mm.
The further scheme is as follows:
the heat exchange device can adopt various heat exchanger forms such as a tubular heat exchanger, a plate heat exchanger and the like, the heat exchange area is calculated according to the characteristics of each heat exchange, and the number n of the heat exchange devices needing to be arranged is calculated.
When the device works specifically, coal enters the distribution bin through the feeding hole with the gas locking function, the coal is uniformly distributed to the heat exchange section through the distribution bin, the coal indirectly exchanges heat with the heat exchange device in a micro-power mode under the gravity condition, steam generated in the heat exchange process is led out through secondary steam leading-out devices designed at different heights, and the dried material enters the discharging bin and is sent out through a gas locking discharging hole.
The device is suitable for the condition that the ratio of the maximum particle size Dmax of the fed material to the equivalent diameter Dm is less than (2-5), the more uniform the particle size of the material is, the better the particle size of the material is, and the feeding is carried out after the coal blending is crushed when the coking coal is used.
The device scheme can be used for changing the moisture of the coal material from 10% to 2% under the following conditions. Fresh steam pressure is 0.5-2 Mpa, the temperature of the preheated and utilized drainage water is 20-80 ℃, the drying retention time is about 0.5-4 hours, and the discharging temperature is 0-100 ℃.
The required retention time t of drying is obtained by carrying out balance calculation according to physical parameters such as dehydration amount of materials, and the like, and the required height b of the drying section is calculated according to parameters such as occupied space requirements of equipment and discharge amount. Are not listed again.
The distance e of the secondary steam suit in the same layer can be set by referring to the distance c between the heat exchange devices (4), and can also be corrected according to the heat transfer rate, and the correction system needs to be determined through a heat transfer coefficient test. The best result is that the spacer material is heated uniformly. The unit of e is mm.
The secondary steam suit is composed of an air outlet pipe and a hood shown in figure 3. One mode provided by the patent of the invention is under the condition of ensuring air outlet, but the patent is not limited to the secondary steam air outlet mode of the mode, and can also adopt a sloping plate shielding mode, a porous anti-blocking mode, a down-inclined air pipe mode and the like.
Through this drying equipment need not to add extra wet wind of carrying, reduces the process raise dust to effectively reduce the power energy consumption of drying process.
The invention also provides a coal drying system, wherein a drying system consisting of the coal dryer is connected with the feeding system and the discharging system, a heat exchange device in the drying system is connected with a new steam system, a secondary steam outlet in the drying system is also connected with a steam circulation system, the steam circulation system is connected with the heat exchange device, and the drying system is also connected with a waste heat utilization system and a drainage system.
The invention also provides a coal drying method, which adopts the coal drying system and specifically comprises the following steps:
the coal material enters the drying system through the feeding system and indirectly exchanges heat with steam provided by the new steam system, and the coal material moves to the discharging system under the action of gravity in the heat exchange process to finish the discharging of the coal drying. And secondary steam generated in the drying process is collected by a steam circulating system and then is sent to a heat exchanger of the drying system to replace part of fresh steam supplied by a new steam system, steam condensate water is circulated to a dry coal outlet end or other ends needing heat preservation through a waste heat utilization system to be subjected to waste heat utilization, and low-temperature water is subjected to hierarchical drainage treatment by a drainage system.
The further scheme is as follows:
it is necessary to set at least two levels 1) one level of the condensed water levels of the live steam and the supplementary steam, and 2) one level of the secondary steam condensed water.
The invention provides a solid drying mode without carrying moisture, and particularly provides a drying mode with low energy consumption and high safety for the field of coal drying and coking coal drying. The steam consumption in the drying process is reduced by more than 50 percent.
Drawings
FIG. 1 is a schematic diagram of a coal dryer;
FIG. 2 is a top view of a coal dryer;
FIG. 3 is a schematic view of a heat exchange apparatus;
FIG. 4 is a schematic view of a secondary steam kit;
FIG. 5 is a schematic view of a coal drying system.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in the attached drawings 1 to 4, the coal dryer comprises an air locking feed inlet 1, a distribution bin 3 connected with the air locking feed inlet, a heat exchange section connected with the distribution bin, a discharge bin 6 connected with the heat exchange section, and a discharge outlet 7 arranged on the discharge bin, wherein the distribution bin is provided with an explosion venting valve 2, the heat exchange section comprises a heat exchange device 4 and a secondary steam derivation kit 5, the secondary steam derivation kit has at least one layer, and each layer of secondary steam derivation kit is provided with a secondary steam outlet 8.
The secondary steam deriving kit comprises a plurality of secondary steam kits, the secondary steam kits comprise a conical arch-breaking hood 9, the lower part of the arch-breaking hood is connected with a negative pressure secondary steam pipe 10, the negative pressure secondary steam pipe is connected with a positive pressure secondary steam back-blowing pipe 11 through a pressure control valve 12, and the positive pressure secondary steam back-blowing pipes of the secondary steam kits are connected with a secondary steam outlet.
As shown in the attached figure 5, the invention also provides a coal drying system, a drying system 13 consisting of the coal dryer is connected with a feeding system 14 and a discharging system 15, a heat exchange device in the drying system is connected with a new steam system 16, a secondary steam outlet in the drying system is also connected with a steam circulation system 17 which is connected with the heat exchange device through the steam circulation system, and the drying system is also connected with a waste heat utilization system 18 and a drainage system 19.
An embodiment of the present invention further provides a coal drying method, which adopts the coal drying system, and specifically includes:
the coal material enters the drying system 13 through the feeding system 14 and indirectly exchanges heat with steam provided by the new steam system 16, and the coal material moves to the discharging system 15 under the action of gravity in the heat exchange process to finish the discharging of the coal drying. Secondary steam generated in the drying process is collected by a steam circulating system 17 and then sent to a heat exchanger of the drying system to replace part of fresh steam supplied by a fresh steam system 16, steam condensate water is circulated to a dried coal outlet end or other ends needing heat preservation through a waste heat utilization system 18 to be subjected to waste heat utilization, and low-temperature water is subjected to hierarchical drainage treatment by a drainage system 19, wherein at least two levels 1) one level of condensate water level of the fresh steam and the supplementary steam is required to be set, and 2) the secondary steam condensate water is one level.
The process has the characteristics that the dryer does not need to be additionally provided with wet air, dust in the process is reduced, the power energy consumption in the drying process is effectively reduced, the heat energy of steam exhaust gas can be greatly utilized, and the energy utilization efficiency is improved.
The invention is further illustrated by the following more specific examples.
The properties and dewatering amount of a coal charge required for drying solid coal in a plant are shown in the following table:
TABLE 1 coal Properties
According to the dehydration amount of the equipment, the height of the equipment is given to be 10m, the retention time is 1 hour, the comprehensive heat transfer coefficient of the heat exchanger is selected to be 5, and the number of heat exchangers is 20. Calculating the heat exchange plate interval of 30mm, the plate inner interval of 20mm, the secondary air outlet interval of 30mm according to the material property and the heat transfer formula, and the back-blowing pressure valve control design of 0.4Mpa
After the equipment customization is completed, the coal material is processed according to the process flow of fig. 4, wherein the steam condensate water, the fresh steam condensate water supply system and the secondary steam condensate water system need to be separately arranged. The secondary steam generated in the drying process is subjected to secondary compression through an MVR mechanical steam compression system and enters a heat exchanger, so that the energy consumption is reduced, and the steam amount required by drying is reduced by more than 50% under the process flow.
Example 2:
the properties and dewatering of the coal charge for which a plant is required to dry for coking are shown in the following table:
TABLE 1 coal Properties
According to the dehydration amount of the equipment, the height of the given equipment is 30m, the retention time is 3 hours, the comprehensive heat transfer coefficient of the heat exchanger is 10, and the number of heat exchangers is 200. The heat exchange plate interval is calculated to be 40mm according to the material property and the heat transfer formula, the plate inner interval is 24mm, the secondary air outlet interval is 24mm, the back blowing pressure valve control design is 0.6Mpa, wherein the heat exchange plate interval is considered according to the high multiple of the maximum grain diameter.
After the equipment customization is completed, the coal material is processed according to the process flow of fig. 4, wherein the steam condensate water, the fresh steam condensate water supply system and the secondary steam condensate water system need to be separately arranged. The secondary steam generated in the drying process is subjected to secondary compression through an MVR mechanical steam compression system and enters a heat exchanger, so that the energy consumption is reduced, and the steam amount required by drying is reduced by more than 50% under the process flow.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (8)
1. A coal dryer characterized in that: the device comprises a gas locking feed port, a distribution bin connected with the gas locking feed port, a heat exchange section connected with the distribution bin, and a discharge bin connected with the heat exchange section, wherein a discharge port is formed in the discharge bin, a discharge explosion valve is arranged on the distribution bin, the heat exchange section comprises a heat exchange device and a secondary steam derivation kit, the secondary steam derivation kit is provided with at least one layer, and each layer of secondary steam derivation kit is provided with a secondary steam outlet.
2. The coal dryer of claim 1, wherein: the secondary steam export external member includes a plurality of secondary steam external members, the secondary steam external member includes a conical broken arch hood, broken arch hood sub-unit connection negative pressure secondary steam pipe, and the negative pressure secondary steam pipe returns the blowpipe through pressure control valve and malleation secondary steam and links to each other, and the malleation secondary steam of a plurality of secondary steam external members returns the blowpipe and all links to each other with the secondary steam export.
3. The coal dryer according to claim 1 or 2, characterized in that: the number N of layers of the secondary steam deriving kit is determined according to the total height b of the drying section, the required drying retention time t and the comprehensive heat conducting value theta; wherein theta is an empirical number obtained from the drying rate of the coal obtained by a thin-layer drying test and the heat conductivity coefficient under the bulk material condition, and the value range of theta is 0-10;
when b/t is less than or equal to theta, N is 1
When b/t is larger than or equal to theta, N is equal to b/theta, and N is hoped to be rounded up.
4. The coal dryer according to claim 1 or 2, characterized in that: the distance a between two adjacent secondary steam deriving suites is equal to theta x t.
5. The coal dryer of claim 1, wherein: the distance c between the heat exchange devices and the distance d between the internal intervals of the heat exchange devices are intervals set for preventing materials from being bonded and formed in the drying process; the value range of the composite material takes the equivalent diameter Dm and the maximum granularity Dmax of the material and the comprehensive heat conduction value theta into consideration; the interval value needs to be considered according to the following formula
Theta x t/n is larger than or equal to c and larger than or equal to d and is equal to (3-5) Dmax, and Dmax/Dm is smaller than or equal to 2-5.
6. A coal drying system characterized by:
the coal drying system comprises a drying system consisting of the coal dryer of any one of claims 1 to 5, a feeding system and a discharging system, wherein the drying system is connected with the feeding system and the discharging system, a heat exchange device in the drying system is connected with a new steam system, a secondary steam outlet in the drying system is also connected with a steam circulating system, the steam circulating system is connected with the heat exchange device, and the drying system is also connected with a waste heat utilization system and a drainage system.
7. A coal drying method using the coal drying system according to claim 6, characterized in that:
the coal material enters the drying system through the feeding system and indirectly exchanges heat with steam provided by the new steam system, and the coal material moves to the discharging system under the action of gravity in the heat exchange process to finish the discharging of the dried coal; and secondary steam generated in the drying process is collected by a steam circulating system and then is sent to a heat exchanger of the drying system to replace part of fresh steam supplied by a new steam system, steam condensate water is circulated to a dry coal outlet end or other ends needing heat preservation through a waste heat utilization system to be subjected to waste heat utilization, and low-temperature water is subjected to hierarchical drainage treatment by a drainage system.
8. The coal drying method according to claim 7, characterized in that: it is necessary to set at least two levels 1) one level of the condensed water levels of the live steam and the supplementary steam, and 2) one level of the secondary steam condensed water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911049456.6A CN110762998A (en) | 2019-10-31 | 2019-10-31 | Coal dryer, coal drying system and coal drying method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911049456.6A CN110762998A (en) | 2019-10-31 | 2019-10-31 | Coal dryer, coal drying system and coal drying method |
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| CN110762998A true CN110762998A (en) | 2020-02-07 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1531564A (en) * | 1975-03-24 | 1978-11-08 | Hydrocarbon Research Inc | Process for drying coal |
| CA2225569A1 (en) * | 1996-12-23 | 1998-06-23 | Firma Starcosa-Tag, Division Of Braunschweigisch Maschinenbauanstalt Ag | Drier with exhaust gas purification |
| CN201697441U (en) * | 2010-07-12 | 2011-01-05 | 山东天力干燥设备有限公司 | Indirect heat exchanging drying low-rank coal utilization system of pumped steam of thermal power plant |
| CN103090642A (en) * | 2013-01-17 | 2013-05-08 | 聂红军 | Granular material regeneration type fixed bed drying technology and device |
| CN204165366U (en) * | 2014-08-06 | 2015-02-18 | 秦振光 | A kind of device for dry coal |
| CN105292572A (en) * | 2015-11-06 | 2016-02-03 | 宣城新威华化工科技有限公司 | Air extractor for powder packaging |
| CN206318889U (en) * | 2016-12-23 | 2017-07-11 | 湖南省科建市政工程有限公司 | A kind of high-efficient ventilation device of sludge aerobic compost |
| CN108917082A (en) * | 2018-06-05 | 2018-11-30 | 重庆大学 | A kind of ventilating system adaptation intake stack structure |
-
2019
- 2019-10-31 CN CN201911049456.6A patent/CN110762998A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1531564A (en) * | 1975-03-24 | 1978-11-08 | Hydrocarbon Research Inc | Process for drying coal |
| CA2225569A1 (en) * | 1996-12-23 | 1998-06-23 | Firma Starcosa-Tag, Division Of Braunschweigisch Maschinenbauanstalt Ag | Drier with exhaust gas purification |
| CN201697441U (en) * | 2010-07-12 | 2011-01-05 | 山东天力干燥设备有限公司 | Indirect heat exchanging drying low-rank coal utilization system of pumped steam of thermal power plant |
| CN103090642A (en) * | 2013-01-17 | 2013-05-08 | 聂红军 | Granular material regeneration type fixed bed drying technology and device |
| CN204165366U (en) * | 2014-08-06 | 2015-02-18 | 秦振光 | A kind of device for dry coal |
| CN105292572A (en) * | 2015-11-06 | 2016-02-03 | 宣城新威华化工科技有限公司 | Air extractor for powder packaging |
| CN206318889U (en) * | 2016-12-23 | 2017-07-11 | 湖南省科建市政工程有限公司 | A kind of high-efficient ventilation device of sludge aerobic compost |
| CN108917082A (en) * | 2018-06-05 | 2018-11-30 | 重庆大学 | A kind of ventilating system adaptation intake stack structure |
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Application publication date: 20200207 |