CN111023728A - Multistage built-in heat source and multistage waste heat recovery utilize formula grain drying tower - Google Patents

Multistage built-in heat source and multistage waste heat recovery utilize formula grain drying tower Download PDF

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Publication number
CN111023728A
CN111023728A CN202010057265.0A CN202010057265A CN111023728A CN 111023728 A CN111023728 A CN 111023728A CN 202010057265 A CN202010057265 A CN 202010057265A CN 111023728 A CN111023728 A CN 111023728A
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chamber
air
hot
grain
drying
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Chinese (zh)
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郭桂霞
陆学中
张德榜
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Zhengzhou Wangu Machinery Co ltd
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Zhengzhou Wangu Machinery Co ltd
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Priority to CN202010057265.0A priority Critical patent/CN111023728A/en
Publication of CN111023728A publication Critical patent/CN111023728A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F26B9/063—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers for drying granular material in bulk, e.g. grain bins or silos with false floor
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B9/00—Preservation of edible seeds, e.g. cereals
    • A23B9/08—Drying; Subsequent reconstitution
    • 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
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • 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
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/85—Food storage or conservation, e.g. cooling or drying
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower comprises a tower body and a plurality of air chambers, the interior of the tower body is sequentially provided with a grain storage section, a multi-stage drying section, a cooling section, a grain discharging section and a grain discharging hopper from top to bottom, wind chambers matched with the left and right sides of the tower body of the multistage drying section and the cooling section are arranged from top to bottom, the air chambers are divided into a waste air chamber, a hot air chamber and a cold air chamber according to functions, the air chambers on the left side are alternately and sequentially arranged upwards according to the waste air chamber and the hot air chamber, the lowest layer of the air chambers on the right side is the cold air chamber, the upper part of the cold air chamber is alternately and sequentially arranged upwards according to a waste gas chamber and a hot air chamber, hot blast stoves are arranged in the waste gas chamber and the hot air chamber of the upper and lower adjacent grain discharge sections, the hot blast stove is one or more of a vertical type hot blast stove and a direct combustion type hot blast stove, an air outlet of the hot blast stove is arranged in a hot blast chamber, and an air inlet of the hot blast stove is arranged in a waste gas chamber. The invention provides a multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower, which can solve the problems of energy consumption saving and emission pollution reduction.

Description

Multistage built-in heat source and multistage waste heat recovery utilize formula grain drying tower
Technical Field
The invention relates to drying equipment in the field of grain drying, in particular to a multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower.
Background
The grain drying tower is a mechanized grain drying device, which is used for drying the wet grain which is just harvested.
At present, the grain drying tower type widely used in China mainly adopts a continuous tower type drying tower, adopts a convection heating power drying mode, and has the working principle that: the hot air is directly contacted with the grains, the heat in the hot air is transferred to the grains in a convection mode, so that the temperature of the grains is raised, the water in the grains is vaporized and evaporated, and the waste gas after heat release carries the water vapor out of the drying tower, thereby achieving the aim of drying the grains. Therefore, the hot air is not only a carrier for transferring heat, but also a carrier for carrying moisture in the grain drying process, and is discharged out of the drying tower after the drying process is finished. Meanwhile, the dried grains cannot be safely stored due to high grain temperature, and the temperature of the grains must be reduced to the safe storage temperature in a cooling mode and then discharged out of the machine. The cooling of grain also all uses the air convection cooling's mode at present, and through cold air and grain contact promptly, the heat in the hot grain transmits the cold air through the mode of convection current for the temperature of grain descends, reaches refrigerated purpose. The temperature of the cold air rises after absorbing the heat in the grains, and the cold air becomes cooling waste gas with a certain temperature and is discharged out of the drying tower.
Therefore, during the operation of the grain dryer, there are two problems that must be taken into account:
1. in the composition of the grain drying system, because a large amount of hot air is required to be provided for the drying tower as a drying medium, various types of heat source equipment capable of generating the required hot air are required to be equipped, the hot air generated by the heat source equipment is sent to the drying tower through a fan and a hot air pipeline, and the heat source equipment and the hot air pipeline inevitably have heat loss in the working process.
2. During the drying process, because of the generation of drying waste gas and cooling waste gas, a large amount of drying waste gas is discharged, and the discharge amount of the drying waste gas can reach 250000m3/h by taking a common rice drying tower with a daily treatment capacity of 500 tons as an example. The discharge of a large amount of drying exhaust gas brings about two problems:
(1) the drying waste gas contains more dust particles, the content of the dust particles in the waste gas can exceed 100 mg/m 3 according to the different types of the dried grains and the cleanness degree of the grains entering the machine, and the waste gas can form serious air pollution when being discharged into the atmosphere without being processed.
(2) The drying waste gas has a certain temperature which can reach about 55 ℃, a large amount of drying waste gas is discharged to cause a large amount of heat loss, the heat of the discharged loss can account for more than 25% of the total heat of the drying system, and the cost of grain drying operation is increased.
In recent years, energy conservation, emission reduction and environmental pollution control become one of the most important industrial and economic policies in China, and the grain drying industry is an industry which has high energy consumption and large pollution and cannot be shut down, so that a main task in the domestic grain drying tower industry is to design, research and develop clean grain drying equipment which saves energy consumption and reduces emission pollution.
In summary, how to design a clean grain drying device which can save energy consumption and reduce emission pollution becomes a problem to be solved by technical personnel in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower, which can solve the problems of energy consumption saving and emission pollution reduction.
In order to achieve the purpose, the invention adopts the technical scheme that: a multi-stage built-in heat source and multi-stage waste heat recycling grain drying tower comprises a tower body and a plurality of air chambers, wherein a feed inlet is formed in the top of the tower body, a discharge outlet is formed in the bottom of the tower body, a grain storage section, a multi-stage drying section, a cooling section, a grain discharge section and a grain discharge hopper are sequentially arranged in the tower body from top to bottom, the feed inlet is communicated with the grain storage section, the discharge outlet is communicated with the grain discharge section, horn-shaped boxes which are uniformly arranged are distributed in the multi-stage drying section and the cooling section, two rows of horn-shaped boxes which are adjacent from top to bottom are arranged in a staggered manner, a grain discharge mechanism is arranged in the grain discharge section, air chambers matched with the multi-stage drying section and the cooling section are respectively arranged on the left side and the right side of the tower body from top to bottom, each side air chamber is separated by a baffle, a vent hole, the plenum divide into exhaust-gas chamber, hot-blast room and cold air chamber according to the function, is located the left the plenum is according to exhaust-gas chamber, hot-blast room and upwards arranges in turn, is located the right the plenum lower floor is the cold air chamber, the cold air chamber top is according to exhaust-gas chamber, hot-blast room and upwards arranges in turn, the cold air chamber and being located the top the exhaust-gas chamber all sets up opening and atmosphere intercommunication, upper and lower adjacent row grain section exhaust-gas chamber, the indoor portion of hot-blast furnace set up the hot-blast furnace, the hot-blast furnace is vertical, direct combustion formula hot-blast furnace one kind or multiple, the hot-blast furnace air outlet sets up in hot-blast room.
Preferably, multistage drying section all sets up fan one in being provided with the exhaust-gas chamber of hot-blast furnace, the export of fan one and the air intake intercommunication of hot-blast furnace, the cold air outdoor side sets up fan two, the export of fan two and the opening intercommunication of cold air chamber, the exhaust-gas chamber outside that is located the top sets up fan three, the import of fan three and the opening intercommunication of exhaust-gas chamber.
Preferably, the horn-shaped box is divided into an air inlet horn-shaped box and an air outlet horn-shaped box, the air inlet horn-shaped box is communicated with the air vents of the hot air chamber and the cold air chamber respectively, the air outlet horn-shaped box is communicated with the air vents of the waste air chamber, and the air inlet horn-shaped box and the air outlet horn-shaped box are arranged in an up-and-down staggered mode reasonably.
Preferably, a material level monitoring device is arranged in the grain storage section, a temperature and humidity monitoring device is arranged in the hot air chamber, the material level monitoring device is linked with the feeding system, and the temperature and humidity monitoring device is arranged in the hot air chamber and linked with the hot air furnace control system.
Preferably, the hot blast stove is a vertical natural gas hot blast stove, the hot blast stove comprises a combustion chamber, an air mixing chamber arranged on the periphery of the combustion chamber and a burner arranged at the bottom of the combustion chamber, an air distribution chamber is arranged below the natural gas hot blast stove, the burner is arranged in the air distribution chamber, and the air distribution chamber is communicated with the air mixing chamber through an air inlet channel.
Preferably, the air distribution chamber is arranged at the top of the hot air chamber below the natural gas hot air furnace.
The invention has the beneficial effects that:
1. the drying mode of repeated heating utilization of the drying waste gas for multiple times can realize the recycling of all sensible heat contained in the cooling waste gas and the drying waste gas, effectively reduce the heat consumption in the grain drying process and greatly reduce the grain drying cost.
2. Compared with the traditional drying mode of repeatedly heating and utilizing the drying waste gas for many times, the drying mode can greatly reduce the discharge amount of the drying waste gas of the grain drying tower and can reduce the discharge amount of the waste gas by more than 50 percent compared with the sectional discharge of the cooling waste gas and the drying waste gas in the grain drying tower. The drying waste gas contains a large amount of dust, fiber and other particles, and the concentration of the particles far exceeds the relevant national environmental protection standard. The reduction of the exhaust emission can greatly reduce the difficulty and the treatment cost of the pollution treatment of the waste gas generated by drying the grain drying tower.
3. The fan is arranged to increase air suction force, so that unsmooth air exhaust of air quantity in the drying tower is avoided, and the fan III is arranged to be beneficial to exhaust of waste gas in the drying tower.
4. The air inlet angle-shaped box and the air outlet angle-shaped box are arranged in a staggered mode from top to bottom, and the air inlet angle-shaped box and the air outlet angle-shaped box can be suitable for a large grain drying tower with large production capacity.
5. The equipment is provided with a material level monitoring device in the grain storage section and is linked with a feeding system outside the drying tower so as to keep the material level in the storage section to be always maintained at a proper position.
6. The hot air and waste gas temperature and humidity monitoring devices are arranged in the air chambers, the hot air and waste gas temperature and humidity are monitored in real time on line, and the temperature of the hot air output by the hot air furnace is automatically adjusted in linkage with the operation control of the gas hot air furnace.
7. The hot blast stove of the built-in heat source multistage waste heat recovery type grain drying tower is built in the drying tower, and compared with the traditional grain drying tower with an external hot blast stove, the grain drying tower has the advantages of small occupied area, simple structure and attractive appearance.
In conclusion, the multi-stage waste heat recycling type grain drying tower with the built-in heat source can greatly reduce the energy consumption of the traditional grain drying tower and reduce the emission of drying waste gas. The invention provides novel energy-saving emission-reducing grain drying equipment for the grain drying industry, accords with the current and future national industrial policy of energy conservation, emission reduction and environmental pollution control, and plays an active promoting role in energy conservation, emission reduction and pollution control for the whole grain drying industry.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of a secondary waste heat utilization type grain drying tower with a built-in heat source according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a built-in heat source three-stage waste heat utilization type grain drying tower provided in the second embodiment of the present invention;
fig. 3 is a schematic view of a grain discharging structure according to a first embodiment of the present invention;
fig. 4 is a schematic view of a structure of a natural gas hot blast stove provided in an embodiment of the present invention.
In the figure: 1-natural gas hot blast stove I, 2, waste gas chamber I, 3-temperature and humidity monitoring device, 4-hot air chamber I, 5-waste gas chamber III, 6-blower III, 7-grain inlet, 8-material level monitoring device, 9-grain storage section, 10-drying section I, 11-hot air chamber II, 12-waste gas chamber II, 13-drying section II, 14-blower I, 15-natural gas hot blast stove II, 16-air distribution chamber, 17-cold air chamber, 18-cooling section, 19-blower II, 20-grain discharge section, 21-base, 22-grain discharge hopper, 23-grain outlet, 24-burner, 25-six-blade wheel type grain discharge mechanism, 26-hot blast stove III, 27-waste gas chamber III, 28-hot air chamber III, 29-blower IV, 30-four waste gas chambers, 31-six discharging impellers, 32-hoppers, 33-lower grain plates, 34-upper grain plates, 35-air inlets, 36-combustion chambers, 37-air mixing chambers and 38-air outlets.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example one
Referring to fig. 1, 3 and 4, a two-stage built-in heat source two-stage waste heat recycling grain drying tower provided by the first embodiment of the present invention includes a tower body vertically installed on a base 21 and having a rectangular cross section, a feed inlet 7 is disposed at the top of the tower body, a discharge outlet 23 is disposed at the bottom of the tower body, a grain storage section 9, a drying section one 10, a drying section two 13, a cooling section 18, a grain discharge section 20 and a grain discharge hopper 22 are sequentially disposed in the tower body from top to bottom, the feed inlet 7 is communicated with the grain storage section 9, the discharge outlet 23 is communicated with the grain discharge hopper 22, a six-bladed wheel type grain discharge mechanism 25 is disposed in the grain discharge section 20, a waste gas chamber three is disposed on the left side of the tower body corresponding to the drying section one 10, a hot air chamber two 11 is disposed on the right side of the corresponding tower body, a hot air chamber one 4 is disposed on the left side of the tower body corresponding to the drying section two, a cold air chamber 17 is arranged at the right side of the corresponding tower body; the waste gas chamber III 5 and the hot air chamber I4, the hot air chamber I4 and the waste gas chamber I2, the hot air chamber 11 and the waste gas chamber II 12, and the waste gas chamber II 12 and the cold air chamber 17 are separated by baffles, vent holes are formed in the side plates of the waste gas chamber I2, the hot air chamber I4, the waste gas chamber III 5, the cold air chamber 17, the waste gas chamber II 12, the hot air chamber II 11 and the tower body, a fan III 6 is arranged above the waste gas chamber III 5 and communicated with the atmosphere and the waste gas chamber III 5, and a fan II 19 is arranged below the cold air chamber 17 and communicated with the atmosphere and the cold air chamber 17.
Drying section one 10, drying section two 13, the inside horniness box that evenly sets up that is covered with of cooling section 18, two adjacent rows of horniness boxes are the dislocation set from top to bottom, the horniness box divide into the horniness box of air inlet and the horniness box of air outlet, the horniness box of air inlet respectively with hot-blast room one 4, hot-blast room two 11, the ventilation hole intercommunication of cold-blast room 17, the horniness box of air outlet is with waste gas chamber one 2, waste gas chamber two 12, the ventilation hole intercommunication of waste gas chamber three 5, the horniness box of air inlet adopts last lower row staggered arrangement with the horniness box.
The grain drying tower adopts a vertical natural gas hot-blast stove, the natural gas hot-blast stove comprises a combustion chamber 36, an air mixing chamber 37 arranged at the periphery of the combustion chamber and a burner 24 arranged at the bottom of the combustion chamber, and an air inlet channel is also arranged at the bottom of the air mixing chamber 37.
The inside of the waste gas chamber I2 and the hot air chamber I4 is provided with a natural gas hot-blast stove I1, an air outlet 34 of the natural gas hot-blast stove I1 is arranged in the hot air chamber I4, an air inlet 35 is arranged in the waste gas chamber I2, and a burner 24 of the natural gas hot-blast stove I1 is arranged below the waste gas chamber I2.
The vertical natural gas hot blast stove II 15 is arranged in the waste gas chamber II 12 and the hot air chamber II 11, the air outlet of the natural gas hot blast stove II 15 is arranged in the hot air chamber II 11, the air inlet of the natural gas hot blast stove II 15 is arranged in the waste gas chamber II 12, the fan I14 is arranged in the waste gas chamber II 12, and the fan I14 is connected with the air inlet of the natural gas hot blast stove II 15. An air distribution chamber 16 is arranged below the natural gas hot blast stove II 15, a burner of the natural gas hot blast stove II 15 is arranged in the air distribution chamber 16, and the air distribution chamber is communicated with an air mixing chamber 37 through an air inlet channel. The air distribution chamber 16 is arranged above the cold air chamber 18 and is communicated with the atmosphere. The air distribution chamber can ensure that air is supplemented when the air quantity of the waste gas in the drying tower entering the natural gas hot blast stove is insufficient.
The grain discharging section 20 adopts a 4-group six-blade wheel type grain discharging structure, the six-blade wheel type grain discharging structure comprises a discharging six-blade wheel 31, an upstream grain plate 34 positioned above the discharging six-blade wheel 31 and a downstream grain plate 32 arranged on one side of the discharging six-blade wheel in an inclined mode, the upstream grain plate 34 and the downstream grain plate 33 form a funnel 32 shape, every two groups of six-blade wheel type grain discharging structures are symmetrically arranged, and the discharging six-blade wheel 31 is driven by a stepless speed change motor. The grain discharging section is composed of impeller mechanisms arranged in pairs, and is driven by a stepless speed regulating motor, so that chain continuous discharging can be realized, and the grain discharging amount is continuously adjustable.
Store up the inside material level monitoring device 8 that sets up of grain section 9, hot-blast room one 4 and two 11 inside humiture monitoring devices 3 that set up of hot-blast room, material level monitoring device 8 and the linkage of feed system, according to the control feeding of material level height, hot-blast room one 4 and two 11 inside humiture monitoring devices 3 and the linkage of hot-blast furnace control system that set up of hot-blast room, adjust the hot-blast furnace heat supply according to the humiture in hot-blast room one 4 and the hot-blast room two.
The workflow of this embodiment is:
grain is discharged from the grain inlet 7 from top to bottom into the grain discharge hopper 22 through the six-impeller grain discharge structure of the grain discharge section 20 through the grain storage section 9, the drying section I10, the drying section II 13 and the cooling section 18, and is discharged through the grain discharge opening 23.
Cold air enters the cold air chamber 17 through the second fan 19 and enters the first exhaust gas chamber 2 through the air inlet horn-shaped box and the air outlet horn-shaped box, and in the process, the cold air passes through grains in the cooling section to cool the grains, and meanwhile, the temperature of the cold air is increased when the cold air cools the grains with higher temperature; and then, the air after temperature rise enters a wind mixing chamber 37 in a natural gas hot blast stove I1 arranged in a waste gas chamber I2, and is mixed with high-temperature gas generated by burning the natural gas by the natural gas hot blast stove, so that the first waste heat recycling is completed.
The mixed hot air enters the first hot air chamber 4, then enters the second drying section 13 to heat and dry grains in the hot air chamber, the dried waste gas after heat release of the second drying section 13 enters the second waste gas chamber 12, enters the air mixing chamber 37 of the second natural gas hot air furnace 15 arranged in the second waste gas chamber 12 through the first fan 14, and then is mixed with high-temperature gas generated by the second natural gas hot air furnace 15, and at the moment, secondary waste heat recycling is completed.
The mixed hot air enters a second hot air chamber 11, then enters a first drying section 10 to be heated and dried with grains therein, and the dried waste gas discharged by the heat release of the first drying section 10 enters a third waste gas chamber 5 and is discharged out of the drying tower through a third fan 6.
Example two
Referring to fig. 2, a schematic structural diagram of a three-stage waste heat recycling grain drying tower with a built-in heat source in three stages according to the present embodiment is basically the same as that of the first embodiment, except that the first embodiment is a two-stage waste heat recycling grain drying tower with a built-in heat source in two stages, and the second embodiment is a three-stage waste heat recycling grain drying tower with a built-in heat source in three stages, and the second embodiment has one more drying section than the first embodiment. As shown in fig. 2, the left side of the tower body corresponding to the drying section and the cooling section is sequentially provided with a hot air chamber four 28, an exhaust gas chamber three 5, a hot air chamber one 4 and an exhaust gas chamber one 2 from top to bottom, the right side of the tower body corresponding to the drying section and the cooling section is sequentially provided with an exhaust gas chamber four 30, a hot air chamber two 11, an exhaust gas chamber two 12 and a cold air chamber 17 from top to bottom, and a fan four 29 is arranged above the exhaust gas chamber four 30; a third natural gas hot blast stove 26 is arranged in the third waste gas chamber 5 and the fourth hot blast chamber 28, and an air distribution chamber below the third natural gas hot blast stove 26 is arranged at the top of the first hot blast chamber 4. The working principle of the second embodiment is basically the same as that of the first embodiment. The beneficial effects are that the drying mode of repeated heating utilization can realize the maximum recycling of all sensible heat contained in the cooling waste gas and the drying waste gas, effectively reduce the heat consumption in the grain drying process and greatly reduce the grain drying cost; compared with the traditional drying mode of repeatedly heating and utilizing the drying waste gas for many times, the drying mode can greatly reduce the discharge amount of the drying waste gas of the grain drying tower and can reduce the discharge amount of the waste gas by more than 50 percent compared with the sectional discharge of the cooling waste gas and the drying waste gas in the grain drying tower. The drying waste gas contains a large amount of dust, fiber and other particles, and the concentration of the particles far exceeds the relevant national environmental protection standard. The reduction of the exhaust emission can greatly reduce the difficulty and the treatment cost of the pollution treatment of the waste gas generated by drying the grain drying tower.
The working principle of the invention is as follows:
because the temperature of the dried grains is high, the grains need to be cooled to the safe storage temperature and then discharged out of the machine. The cooling of grain all uses the mode of air convection cooling at present, and through the contact of cold air and the higher grain of temperature, the heat in the grain is transmitted for the cold air through the mode of convection current for the temperature of grain descends, reaches refrigerated purpose.
The cold air cools hot grains to form cooling waste gas, and the temperature is raised after the heat in the grains is absorbed, generally higher than the ambient temperature by more than 20 ℃, and the sensible heat contained in the grain can be utilized; meanwhile, hot air is used as a drying medium to dry the grains, the hot air is directly contacted with the grains, and heat is transferred to the grains in a convection mode, so that the temperature of the grains is increased, the moisture in the grains is vaporized, and the aim of drying is fulfilled.
The temperature of the hot air after heat release is reduced to become drying waste gas. Similarly, the drying exhaust gas also has a higher temperature, and the temperature of the drying exhaust gas is usually higher than the ambient temperature by more than 20 ℃, and the drying exhaust gas also contains larger sensible heat to be utilized.
In the invention, the drying medium and the air flow are in a serial use state in the grain drying and cooling process of the drying tower, the cooling waste gas generated in the cooling section of the drying tower completely enters the natural gas hot blast stove I arranged in the drying tower, the temperature is raised to become hot air which enters the second drying section, the grain is heated and dried to become drying waste gas, the drying waste gas completely enters the second natural gas hot blast stove arranged in the drying tower, the temperature is raised again to become hot air which enters the first drying section, and the grain in the drying section is heated and dried.
In a traditional grain drying tower, cooling waste gas generated in the grain cooling process is directly discharged out of the drying tower, drying waste gas generated in each drying section in the grain drying process is also respectively discharged out of the drying tower, and a large amount of sensible heat contained in the cooling waste gas and the drying waste gas is lost and wasted along with the discharge of the waste gas.
The drying mode of the invention which uses the drying medium in series for repeated heating and utilization for many times can realize the maximum recovery and utilization of sensible heat contained in the cooling waste gas and the drying waste gas, effectively reduce the heat consumption in the grain drying process and greatly reduce the grain drying cost; meanwhile, the drying tower only needs to discharge the finally generated waste heat and waste gas into the atmosphere, so that the waste gas discharge amount is reduced, and the difficulty and the treatment cost of the pollution treatment of the waste gas dried by the grain drying tower can be greatly reduced by reducing the waste gas discharge amount.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (6)

1. The utility model provides a multistage built-in heat source and multistage waste heat recovery utilize formula grain drying tower, includes tower body and a plurality of plenum, the tower body top sets up the feed inlet, the tower body bottom sets up the discharge gate, the inside from top to bottom of tower body sets gradually stores up grain section, multistage drying section, cooling segment, row's grain section and row's grain fill, feed inlet and storage grain section intercommunication, discharge gate and row's grain section intercommunication, multistage drying section, cooling segment are inside to be covered with the horn-shaped box of even setting, upper and lower adjacent two rows the horn-shaped box is the dislocation set, the inside row's grain mechanism that sets up of row's grain section, its characterized in that: the left and right sides of the tower body of the multistage drying section and the cooling section are respectively provided with an air chamber matched with the multistage drying section and the tower body from top to bottom, each air chamber is separated from each other by a baffle plate, any air chamber is provided with an air vent on a side plate of the tower body and communicated with a horn-shaped box matched with the air vent, the air chambers are divided into a waste gas chamber, a hot gas chamber and a cold gas chamber according to functions, the air chambers are positioned on the left side and are alternately and sequentially upwards arranged according to the waste gas chamber and the hot gas chamber, the lowermost layer of the air chamber on the right side is a cold gas chamber, the upper part of the cold gas chamber is alternately and sequentially upwards arranged according to the waste gas chamber and the hot gas chamber, the cold gas chamber and the waste gas chamber on the uppermost layer are respectively provided with an opening and communicated with the atmosphere, hot blast furnaces are arranged inside the waste gas chamber and the hot, the air inlet of the hot blast stove is arranged in the waste gas chamber.
2. The multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower according to claim 1, wherein: the multistage drying section is provided with all sets up fan I in the exhaust-gas chamber of hot-blast furnace, the export of fan I and the air intake intercommunication of hot-blast furnace, the air conditioning outdoor side sets up fan two, the export of fan two and the opening intercommunication of cold air chamber, the exhaust-gas chamber outside that is located the top sets up fan three, the import of fan three and the opening intercommunication of exhaust-gas chamber.
3. The multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower according to claim 1, wherein: the horn-shaped box is divided into an air inlet horn-shaped box and an air outlet horn-shaped box, the air inlet horn-shaped box is communicated with the air vents of the hot air chamber and the cold air chamber respectively, the air outlet horn-shaped box is communicated with the air vents of the waste air chamber, and the air inlet horn-shaped box and the air outlet horn-shaped box are arranged in a staggered mode from top to bottom.
4. The multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower according to claim 1, wherein: the grain storage section is internally provided with a material level monitoring device, the hot air chamber is internally provided with a temperature and humidity monitoring device, the material level monitoring device is linked with a feeding system, and the hot air chamber is internally provided with a temperature and humidity monitoring device which is linked with a hot air furnace control system.
5. The multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower according to claim 1, wherein: the hot blast stove is a vertical natural gas hot blast stove and comprises a combustion chamber, a wind mixing chamber arranged on the periphery of the combustion chamber and a burner arranged at the bottom of the combustion chamber, wherein a wind distribution chamber is arranged below the natural gas hot blast stove, the burner is arranged in the wind distribution chamber, and the wind distribution chamber is communicated with the wind mixing chamber through a wind inlet channel.
6. The multi-stage built-in heat source and multi-stage waste heat recycling type grain drying tower according to claims 1 and 7, characterized in that: the air distribution chamber is arranged at the top of the hot air chamber below the natural gas hot air furnace.
CN202010057265.0A 2020-01-19 2020-01-19 Multistage built-in heat source and multistage waste heat recovery utilize formula grain drying tower Pending CN111023728A (en)

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CN114688837A (en) * 2020-12-30 2022-07-01 南阳奥科耒科技有限公司 Modular splicing type automatic grain drying tower
CN115289799A (en) * 2022-09-27 2022-11-04 山东天鹅棉业机械股份有限公司 Built-in waste heat recycling grain drying tower and technology of gas furnace
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Publication number Priority date Publication date Assignee Title
CN114688837A (en) * 2020-12-30 2022-07-01 南阳奥科耒科技有限公司 Modular splicing type automatic grain drying tower
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CN115289799A (en) * 2022-09-27 2022-11-04 山东天鹅棉业机械股份有限公司 Built-in waste heat recycling grain drying tower and technology of gas furnace
CN115289799B (en) * 2022-09-27 2023-01-17 山东天鹅棉业机械股份有限公司 Built-in waste heat recycling grain drying tower and technology of gas furnace
CN117928184A (en) * 2024-03-21 2024-04-26 洛阳万谷机械科技有限公司 Energy-saving grain dryer
CN117928184B (en) * 2024-03-21 2024-06-04 洛阳万谷机械科技有限公司 Energy-saving grain dryer

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