CN113218151A - Closed-cycle pulverized coal drying process - Google Patents
Closed-cycle pulverized coal drying process Download PDFInfo
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- CN113218151A CN113218151A CN202110602683.8A CN202110602683A CN113218151A CN 113218151 A CN113218151 A CN 113218151A CN 202110602683 A CN202110602683 A CN 202110602683A CN 113218151 A CN113218151 A CN 113218151A
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- steam
- bin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
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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
- F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
- F26B17/101—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis
- F26B17/102—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis with material recirculation, classifying or disintegrating means
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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
- F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
- F26B17/101—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis
- F26B17/105—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis the shaft or duct, e.g. its axis, being other than straight, i.e. curved, zig-zag, closed-loop, spiral
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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
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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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
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
Abstract
The invention relates to pulverized coal drying, in particular to a closed-loop circulating pulverized coal drying process which avoids combustion and ensures safety. Including tubular dryer, the separator, the collection tank, oil tank and winding tubular heat exchanger, superheated steam gets into tubular dryer, the buggy gets into the tubular dryer heat exchange tube, buggy after the drying gets into the feed bin, smuggle surplus exhaust steam of buggy secretly and get into the separator and carry out the separation once, the buggy gets into the feed bin, surplus exhaust steam gets into the collection tank secondary separation, the fraction gets into the oil tank, surplus exhaust steam gets into winding tubular heat exchanger and heats, superheated steam gets into winding tubular heat exchanger and heats, surplus exhaust steam becomes superheated steam and gets into tubular dryer. The invention adopts the superheated steam as the heat carrier, utilizes the sensible heat energy of the superheated steam, avoids the occurrence of combustion accidents, is safe to use, and adopts the wound tube type heat exchanger to recycle the residual waste steam, so that the drying efficiency is higher when the steam is recycled, and the larger energy conservation is realized.
Description
Technical Field
The invention relates to pulverized coal drying, in particular to a closed-loop circulating pulverized coal drying process which avoids combustion and ensures safety.
Background
Coal is a main energy source in China, accounts for about 70% of primary energy structures, and the main energy source position of the coal cannot be changed in a considerable period of time in the future, high-quality coal resources are used in a large scale, so that the coal is no longer suitable for Chinese energy storage and the situations and requirements of environmental protection, energy conservation and low-carbon economy.
After lignite is dried, dehydrated and processed in an upgrading way, the components and the properties of the lignite are close to those of bituminous coal, and the lignite is more beneficial to utilization, transportation and storage; in recent years, the research on drying, dewatering and deep processing of lignite and high-moisture bituminous coal is increasing, and a lot of relevant basic research and intermediate tests are carried out in the field by countries with abundant resources of lignite and high-moisture bituminous coal in the world.
The deep processing and utilizing method of lignite and high-moisture bituminous coal mainly includes gasification and liquefaction. The dry distillation process is the main process for drying coal powder.
The main drawback of the dry distillation process is that the coal gas and distillate evaporated during the drying process of the pulverized coal are easily burned, which results in human and material losses.
Disclosure of Invention
The invention aims to solve the problems, thereby providing a closed-cycle pulverized coal drying process which avoids combustion and ensures safety.
The invention solves the problems and adopts the technical scheme that:
a closed-loop circulation pulverized coal drying process comprises a steam source bin, a coal bin, a tubular dryer, a bin, a separator, a collecting tank and an oil tank, wherein the steam source bin, the coal bin, the separator and the collecting tank are all connected with the tubular dryer, the collecting tank and the bin are all connected with the separator, and the collecting tank is connected with the oil tank;
the method comprises the following steps: steam from the steam source bin enters a shell layer of the tubular dryer, coal dust from the coal bin enters a heat exchange tube of the tubular dryer, and the steam and the coal dust move forward together to dry the coal dust;
step two: the dried coal powder enters a storage bin, the used waste steam enters a separator for primary separation, and the separator performs gas-solid separation on the waste steam carrying the coal powder;
step three: the pulverized coal after primary separation enters a storage bin, the waste steam after primary separation enters a collection tank for secondary separation, and the collection tank separates the fraction from the waste steam;
step four: the fractions after the secondary separation enter an oil tank, and the residual waste steam after the secondary separation enters a shell layer of the tubular dryer again for cyclic utilization;
steam in the steam source storehouse is superheated steam, still includes winding tubular heat exchanger, and winding tubular heat exchanger connects between feed bin and collection tank, and winding tubular heat exchanger is connected with the steam source storehouse, and surplus exhaust steam after the secondary separation gets into winding tubular heat exchanger and heats again, and superheated steam in the steam source storehouse gets into winding tubular heat exchanger and heats the surplus exhaust steam of inside simultaneously, and surplus exhaust steam after the heating becomes the shell that superheated steam got into tubular drier once more.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
firstly, the superheated steam is used as a heat carrier, and the sensible heat energy of the superheated steam is utilized, so that the combustion accident is avoided, and the use is safe.
Secondly, the winding pipe type heat exchanger is adopted to recycle the residual waste steam, so that the drying efficiency is higher when the steam is recycled, and the winding pipe type heat exchanger has 2-10 times higher heat efficiency than a common tube heat exchanger, thereby realizing larger energy conservation.
Drawings
FIG. 1 is a schematic process flow diagram of an embodiment of the present invention.
In the figure: a pipe dryer 1; a separator 2; a collection tank 3; a wound tube heat exchanger 4; a steam source bin 5; a coal bunker 6.
The specific implementation mode is as follows:
the invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
Referring to fig. 1, a closed-cycle pulverized coal drying process comprises a steam source bin 5, a coal bin 6, a tubular dryer 1, a bin, a separator 2, a collecting tank 3, an oil tank and a wound tubular heat exchanger 4, wherein the steam source bin 5, the coal bin 6, the bin, the separator 2 and the wound tubular heat exchanger 4 are all connected with the tubular dryer 1, the collecting tank 3 and the bin are all connected with the separator 2, the oil tank and the wound tubular heat exchanger 4 are all connected with the collecting tank 3, and the wound tubular heat exchanger 4 is connected with the steam source bin 5;
the method comprises the following steps: superheated steam from the steam source bin 5 enters a shell layer of the tubular dryer 1, coal dust from the coal bin 6 enters a heat exchange tube of the tubular dryer 1, and the steam and the coal dust advance together to dry the coal dust;
step two: the dried coal powder enters a storage bin, the used waste steam enters a separator 2 through a furnace end outlet for primary separation, and the separator 2 performs gas-solid separation on the waste steam carrying the coal powder;
step three: the pulverized coal after primary separation enters a storage bin, the waste steam after primary separation enters a collecting tank 3 for secondary separation, and the collecting tank 3 separates the fraction from the waste steam;
step four: the fractions after the secondary separation enter an oil tank, the residual waste steam after the secondary separation enters the wound tube type heat exchanger 4 to be reheated, and meanwhile, the superheated steam in the steam source bin 5 enters the wound tube type heat exchanger 4 to heat the residual waste steam inside;
step five: the heated residual waste steam becomes superheated steam which is used as a regenerative heat source and enters the shell layer of the tubular dryer 1 again, so that the drying effect of the pulverized coal is ensured.
The invention adopts the superheated steam as the heat carrier, utilizes the sensible heat energy of the superheated steam, avoids the occurrence of combustion accidents, is safe to use, adopts the wound tube type heat exchanger 4 to recycle the residual waste steam, ensures that the drying efficiency is higher when the steam is recycled, and realizes larger energy saving by the heat efficiency 2-10 times higher than that of the common tubular heat exchanger of the wound tube type heat exchanger 4.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (1)
1. A closed-loop circulation pulverized coal drying process comprises a steam source bin, a coal bin, a tubular dryer, a bin, a separator, a collecting tank and an oil tank, wherein the steam source bin, the coal bin, the separator and the collecting tank are all connected with the tubular dryer, the collecting tank and the bin are all connected with the separator, and the collecting tank is connected with the oil tank;
the method comprises the following steps: steam from the steam source bin enters a shell layer of the tubular dryer, coal dust from the coal bin enters a heat exchange tube of the tubular dryer, and the steam and the coal dust move forward together to dry the coal dust;
step two: the dried coal powder enters a storage bin, the used waste steam enters a separator for primary separation, and the separator performs gas-solid separation on the waste steam carrying the coal powder;
step three: the pulverized coal after primary separation enters a storage bin, the waste steam after primary separation enters a collection tank for secondary separation, and the collection tank separates the fraction from the waste steam;
step four: the fractions after the secondary separation enter an oil tank, and the residual waste steam after the secondary separation enters a shell layer of the tubular dryer again for cyclic utilization;
the method is characterized in that: steam in the steam source storehouse is superheated steam, still includes winding tubular heat exchanger, and winding tubular heat exchanger connects between feed bin and collection tank, and winding tubular heat exchanger is connected with the steam source storehouse, and surplus exhaust steam after the secondary separation gets into winding tubular heat exchanger and heats again, and superheated steam in the steam source storehouse gets into winding tubular heat exchanger and heats the surplus exhaust steam of inside simultaneously, and surplus exhaust steam after the heating becomes the shell that superheated steam got into tubular drier once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602683.8A CN113218151A (en) | 2021-05-31 | 2021-05-31 | Closed-cycle pulverized coal drying process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602683.8A CN113218151A (en) | 2021-05-31 | 2021-05-31 | Closed-cycle pulverized coal drying process |
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| Publication Number | Publication Date |
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| CN113218151A true CN113218151A (en) | 2021-08-06 |
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| CN202110602683.8A Pending CN113218151A (en) | 2021-05-31 | 2021-05-31 | Closed-cycle pulverized coal drying process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008549A (en) * | 2006-01-24 | 2007-08-01 | 周增龙 | Rotary multifunctional drying apparatus with spiral coil set |
| CN201569260U (en) * | 2009-12-28 | 2010-09-01 | 山东天力干燥设备有限公司 | Indirect heat-exchange rotation superheating steam brown coal drying system |
| CN102650493A (en) * | 2012-05-21 | 2012-08-29 | 山东天力干燥股份有限公司 | Device and technology for drying lignite by jointly using rotary steam tubes and high frequency |
| CN107796194A (en) * | 2017-10-26 | 2018-03-13 | 南京泰润电力工程有限公司 | A kind of coal slime drying process |
| CN207485486U (en) * | 2017-11-06 | 2018-06-12 | 华北电力大学 | A kind of Analysis of Heat Pump Drying System of integrated pipe drier |
| CN211261867U (en) * | 2019-12-23 | 2020-08-14 | 大连鸿鼎热能技术有限公司 | Energy-saving steam-water heat exchange unit |
-
2021
- 2021-05-31 CN CN202110602683.8A patent/CN113218151A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008549A (en) * | 2006-01-24 | 2007-08-01 | 周增龙 | Rotary multifunctional drying apparatus with spiral coil set |
| CN201569260U (en) * | 2009-12-28 | 2010-09-01 | 山东天力干燥设备有限公司 | Indirect heat-exchange rotation superheating steam brown coal drying system |
| CN102650493A (en) * | 2012-05-21 | 2012-08-29 | 山东天力干燥股份有限公司 | Device and technology for drying lignite by jointly using rotary steam tubes and high frequency |
| CN107796194A (en) * | 2017-10-26 | 2018-03-13 | 南京泰润电力工程有限公司 | A kind of coal slime drying process |
| CN207485486U (en) * | 2017-11-06 | 2018-06-12 | 华北电力大学 | A kind of Analysis of Heat Pump Drying System of integrated pipe drier |
| CN211261867U (en) * | 2019-12-23 | 2020-08-14 | 大连鸿鼎热能技术有限公司 | Energy-saving steam-water heat exchange unit |
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Application publication date: 20210806 |