CN113375434A - Deep waste heat recovery hot air grain drying system - Google Patents

Deep waste heat recovery hot air grain drying system Download PDF

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Publication number
CN113375434A
CN113375434A CN202110826993.8A CN202110826993A CN113375434A CN 113375434 A CN113375434 A CN 113375434A CN 202110826993 A CN202110826993 A CN 202110826993A CN 113375434 A CN113375434 A CN 113375434A
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China
Prior art keywords
air
drying
section
heat exchanger
drying section
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Pending
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CN202110826993.8A
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Chinese (zh)
Inventor
刘林
贾奎增
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Shenyang Shengong Building Energy Saving And Clean Energy Technology Research Institute Co ltd
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Shenyang Shengong Building Energy Saving And Clean Energy Technology Research Institute Co ltd
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Priority to CN202110826993.8A priority Critical patent/CN113375434A/en
Publication of CN113375434A publication Critical patent/CN113375434A/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
    • F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack
    • 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
    • F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
    • 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
    • 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
    • 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

The invention discloses a deep waste heat recovery hot air grain drying system, wherein a grate is arranged below a hearth, a feeding hopper connected with the grate is arranged on the side wall of the hearth, a heat exchanger is arranged at the upper part of the hearth, an induced draft fan is communicated with a cavity inside the hearth, a cooling fan is communicated with a drying tower, the drying tower is communicated with an air cooler through a pipeline, the air cooler is communicated with the heat exchanger, the heat exchanger is communicated with a hot air fan, and an outlet of the hot air fan is communicated with the drying tower. The effect is as follows: the air containing a lot of water vapor and impurities and discharged from the low-temperature drying section of the drying tower is creatively put forward to be directly sent into a hearth to participate in combustion, the impurities are basically burnt out, and due to the fact that the heat exchanger is designed for deep waste heat recovery, the water vapor can be condensed in the heat exchanger, condensation heat is released, and the total amount of recovered waste heat is greatly improved; although the temperature of the air discharged from the cooling section of the drying tower is low, the water vapor and the impurity content are low, the air can be directly used as a drying medium to enter a heat exchanger by slightly filtering, and the waste heat recovery is realized by paying less equipment investment.

Description

Deep waste heat recovery hot air grain drying system
Technical Field
The invention relates to the technical field of grain drying, in particular to a hot air grain drying system for deep waste heat recovery.
Background
The food safety is an important basis for national safety. This involves three aspects of work: a grain comprehensive production system, a grain storage and circulation system and a grain safety management system. And the grain drying is an important link after the grain is delivered and is an extremely important condition for the safe storage of the grain. In order to reduce field loss and ensure harvest quality, timely harvest is generally required, but most of the harvested grains have high moisture. In the south mid-late rice and the north autumn, the moisture content of the corn is high (the moisture content can reach more than 30 percent), and the manual airing is difficult due to low temperature in autumn and the like, so that the mechanical drying of the grains is an important guarantee means for 'grain warehousing' of the grains. According to statistics, after the grains in China are harvested, mildew, germination and deterioration occur in the links of storage, transportation, processing and the like due to the fact that the climate is humid, the grains cannot be dried in the sun or the safe storage of water is not achieved, and the throwing loss in the drying process can reach 5% of the total yield of the grains in China, about 700 hundred million jin of the grains, the economic loss is up to 300 plus 600 hundred million yuan, and the annual grain loss with abnormal climate is more serious.
At present, the grain drying equipment in China uses a coal-fired hot-blast stove as a heat source, and a drying tower is generally provided with three drying sections and a cooling section. The air discharged from the drying section of the drying tower contains more water vapor and impurities, the temperature is not high, the air discharged from the cooling section of the drying tower is lower in temperature, the recycling technology is difficult, and the economic benefit is not high.
The coal consumed in China every year is 1/2 used for power generation, 1/4 is used for producing industrial steam, hot water or hot air, and the 1/4 coal discharges 45% of dust and 37% of sulfur dioxide in total, thereby causing huge pollution. Wherein the hot air produced is mainly used in the field of drying, in particular in the field of grain drying. Along with the approach of carbon peak reaching and carbon neutralization and the improvement of the national energy-saving, emission-reducing and carbon-reducing regulations, more and more attention is paid to how to improve the energy efficiency of a hot air grain drying system and reduce the unit energy consumption of grain drying.
In order to improve the energy efficiency of a hot air grain drying system, reduce the unit energy consumption of grain drying and achieve the purposes of energy conservation, emission reduction and carbon reduction, the invention designs the hot air grain drying system with deep waste heat recovery.
Disclosure of Invention
Therefore, the invention provides a hot air grain drying system with deep waste heat recovery, which aims to solve the problems that the air discharged from the drying section of a drying tower of the existing grain drying system contains more water vapor and impurities, the temperature is not high, the temperature of the air discharged from the cooling section of the drying tower is lower, the recycling technology is difficult, and the economic benefit is not high.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to the first aspect of the invention, the deep waste heat recovery hot air grain drying system comprises an induced draft fan, a heat exchanger, an air cooler, a hearth, a feed hopper, a grate, a cooling fan, a drying tower and an air heater; the utility model discloses a drying furnace, including furnace, furnace's below be provided with the grate, furnace's lateral wall be provided with the grate is connected the feeder hopper, furnace's upper portion is worn to be equipped with the heat exchanger, the entry of draught fan with the inside cavity intercommunication of furnace, cooling blower's export with the drying tower intercommunication, the export of drying tower pass through the pipeline with the air-cooler intercommunication, the export of air-cooler with the one end intercommunication of heat exchanger, the other end of heat exchanger pass through the pipeline with the air heater intercommunication, the export of air heater pass through the pipeline with the drying tower intercommunication.
Further, the drying tower comprises a cooling section, a low-temperature drying section, a medium-temperature drying section and a high-temperature drying section; the cooling section, the low-temperature drying section, the medium-temperature drying section and the high-temperature drying section are sequentially arranged from bottom to top.
Further, the drying tower comprises a cooling section, a low-temperature drying section, a medium-temperature drying section and a high-temperature drying section; the cooling section, the low-temperature drying section, the medium-temperature drying section and the high-temperature drying section are sequentially arranged from bottom to top.
Further, the high-temperature drying section is communicated with the hearth through a pipeline.
Further, fuel is brought into the hearth by the grate through the feed hopper, the fuel and air are subjected to combustion reaction in the hearth to generate high-temperature flue gas, and the high-temperature flue gas is extracted by the induced draft fan and is changed into low-temperature flue gas after passing through the heat exchanger; the cooling fan extracts air and sends the air into the cooling section of the drying tower to cool the dried grains; the air cooler extracts air heated in the cooling section and air in the environment, the air enters the heat exchanger and exchanges heat with high-temperature flue gas in the heat exchanger, so that the air becomes high-temperature air, the high-temperature air is respectively sent into the low-temperature drying section, the medium-temperature drying section and the high-temperature drying section of the drying tower by the air heater to dry grains, the air with the temperature reduced after the high-temperature section works is extracted by the draught fan, and part of the ambient air is mixed and enters the hearth to participate in combustion.
The invention has the following advantages: the air discharged from the low-temperature drying section of the drying tower contains more water vapor and impurities, although the temperature is not high, the temperature is higher than that of the air discharged from the medium-temperature drying section of the drying tower and the high-temperature drying section of the drying tower, and the value of deep waste heat recovery is the greatest; but firstly, the water vapor content is too large, and if the water vapor is recycled as a drying medium, the drying capacity of the drying medium is not reduced; secondly, the content of impurities is too large, if the waste heat recovery device is used as a drying medium to be recovered, the problems of impurity filtration, cleaning and resistance of a filtering device and waste heat recovery difficulty are increased in order to avoid blocking a conveying pipeline and a heat exchange pipeline and damaging a fan; the design creatively provides that the air containing a lot of water vapor and impurities and discharged from the low-temperature drying section of the drying tower is directly sent into the hearth to participate in combustion, so that the impurities are basically burnt out, and because the heat exchanger is designed for deep waste heat recovery, the water vapor can be condensed in the heat exchanger to release condensation heat, thereby greatly improving the total amount of recovered waste heat; although the temperature of the air discharged from the cooling section of the drying tower is low, the contents of water vapor and impurities are low, the air can be directly used as a drying medium to enter a heat exchanger by slightly filtering, and the waste heat can be recycled by paying less equipment investment; meanwhile, as the heat exchange capacity of the heat exchanger is high, the temperature of the low-temperature flue gas is between 45 ℃ and 55 ℃, water vapor from fuel and air in the environment in the low-temperature flue gas is partially condensed, and latent heat of gasification is released, so that the energy efficiency of the whole drying system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a structural diagram of a deep waste heat recovery hot air grain drying system according to some embodiments of the present invention.
In the figure: 1. the system comprises an induced draft fan, 2, a heat exchanger, 3, an air cooler, 4, a hearth, 5, a feed hopper, 6, a grate, 7, a cooling fan, 8, a cooling section, 9, a low-temperature drying section, 10, a medium-temperature drying section, 11, a high-temperature drying section, 12, a drying tower, 13 and an air heater.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the hot air grain drying system with deep waste heat recovery in the first embodiment of the present invention includes an induced draft fan 1, a heat exchanger 2, an air cooler 3, a furnace 4, a feed hopper 5, a grate 6, a cooling fan 7, a drying tower 12, and an air heater 13; furnace 4's below is provided with grate 6, furnace 4's lateral wall is provided with the feeder hopper 5 of being connected with grate 6, heat exchanger 2 is worn to be equipped with on furnace 4's upper portion, draught fan 1's entry and the inside cavity intercommunication of furnace 4, cooling fan 7's export and drying tower 12 intercommunication, pipeline and air-cooler 3 intercommunication are passed through in the export of drying tower 12, the export of air-cooler 3 and the one end intercommunication of heat exchanger 2, the other end of heat exchanger 2 passes through pipeline and air heater 13 intercommunication, the export of air heater 13 passes through pipeline and drying tower 12 intercommunication.
In the above embodiment, it should be noted that the induced draft fan 1, the air cooler 3, the grate 6, the cooling fan 7, and the air heater 13 are all mature components in the prior art, and the heat exchanger 2 is internally provided with multiple layers of heat exchange fins; the air discharged from the low-temperature drying section of the drying tower contains more water vapor and impurities, although the temperature is not high, the temperature is higher than that of the air discharged from the medium-temperature drying section of the drying tower and the high-temperature drying section of the drying tower, and the value of deep waste heat recovery is the greatest; but firstly, the water vapor content is too large, and if the water vapor is recycled as a drying medium, the drying capacity of the drying medium is not reduced; secondly, impurity content is too big, if retrieve as dry media, in order to avoid blockking up pipeline, heat transfer pipeline, avoids damaging the fan, need filter impurity, filter equipment's cleanness and resistance problem have increaseed the waste heat recovery degree of difficulty.
The technical effects achieved by the above embodiment are as follows: the design creatively provides that the air containing a lot of water vapor and impurities and discharged from the low-temperature drying section of the drying tower is directly sent into the hearth to participate in combustion, so that the impurities are basically burnt out, and because the heat exchanger is designed for deep waste heat recovery, the water vapor can be condensed in the heat exchanger to release condensation heat, thereby greatly improving the total amount of recovered waste heat; although the temperature of the air discharged from the cooling section of the drying tower is low, the contents of water vapor and impurities are low, the air can be directly used as a drying medium to enter a heat exchanger by slightly filtering, and the waste heat can be recycled by paying less equipment investment; meanwhile, as the heat exchange capacity of the heat exchanger is high, the temperature of the low-temperature flue gas is between 45 ℃ and 55 ℃, water vapor from fuel and air in the environment in the low-temperature flue gas is partially condensed, and latent heat of gasification is released, so that the energy efficiency of the whole drying system is improved.
Alternatively, as shown in fig. 1, in some embodiments, the drying tower 12 includes a cooling section 8, a low temperature drying section 9, a medium temperature drying section 10, and a high temperature drying section 11; the cooling section 8, the low-temperature drying section 9, the medium-temperature drying section 10 and the high-temperature drying section 11 are arranged from bottom to top in sequence.
In the above alternative embodiment, it should be noted that the drying tower 12 has a cylindrical or prismatic hollow shell structure.
The beneficial effects of the above alternative embodiment are: through the setting of this embodiment, drying tower 12's simple structure, the heat transfer effect is showing and is promoting, and investment cost is little.
Alternatively, as shown in fig. 1, in some embodiments, the outlet of the cooling blower 7 is communicated with the cooling section 8, and the outlet of the hot blower 13 is communicated with the low-temperature drying section 9, the medium-temperature drying section 10 and the high-temperature drying section 11 through pipes, respectively.
In the above alternative embodiment, it should be noted that the cooling fan 7 is communicated with the cooling section 8 through a pipeline, and a switch valve may be disposed on the pipeline, and a switch valve may still be disposed on the pipeline between the outlet of the hot air blower 13 and each of the low temperature drying section 9, the medium temperature drying section 10 and the high temperature drying section 11.
The beneficial effects of the above alternative embodiment are: through the arrangement, the air containing a lot of water vapor and impurities and discharged from the low-temperature drying section of the drying tower 12 is directly sent into the hearth to participate in combustion, so that the impurities are basically burnt out, the air discharged from the cooling section 8 of the drying tower 12 is low in temperature, but the water vapor and the impurities are low in content, the air can be directly used as a drying medium to enter the heat exchanger 2 by slightly filtering, and the waste heat can be recycled by paying less equipment investment.
Optionally, as shown in fig. 1, in some embodiments, the high temperature drying section 11 is also in communication with the furnace 4 through a duct.
In the above alternative embodiment, it should be noted that the duct connecting the high temperature drying section 11 with the bottom of the furnace 4 is located at the center of the bottom of the furnace 4.
The beneficial effects of the above alternative embodiment are: through the arrangement, the timely extraction of the air with the temperature reduced after the high-temperature drying section 11 works by the draught fan 1 is realized.
Optionally, as shown in fig. 1, in some embodiments, the fuel is carried into the furnace chamber 4 by the grate 6 through the feed hopper 5, the fuel and the air undergo a combustion reaction in the furnace chamber 4 to generate high-temperature flue gas, and the high-temperature flue gas is extracted by the induced draft fan 1 and becomes low-temperature flue gas after passing through the heat exchanger 2; the cooling fan 7 pumps air and sends the air into the cooling section 8 of the drying tower 12, and the dried grains are cooled; the air cooler 3 extracts air heated in the cooling section 8 and air in the environment, the air enters the heat exchanger 2 and exchanges heat with high-temperature flue gas in the heat exchanger 2, so that the air becomes high-temperature air, the high-temperature air is respectively sent into the low-temperature drying section 9, the medium-temperature drying section 10 and the high-temperature drying section 11 of the drying tower 12 by the air heater 13 to dry grains, the air with reduced temperature after the high-temperature drying section 11 works is extracted by the draught fan 1, and part of the ambient air is mixed and enters the hearth 4 to participate in combustion.
In the above alternative embodiment, it should be noted that the grate 6 has a function of conveying the fuel fed from the hopper 5 into the furnace 4.
The beneficial effects of the above alternative embodiment are: through the arrangement of the structure, the automatic feeding of the fuel is realized.
Alternatively, as shown in FIG. 1, in some embodiments, the hopper 5 is a top-down necked configuration.
In the alternative embodiments described above, it should be noted that the feed hopper 5 is provided, for example, as a funnel structure having an inclined plane inside.
The beneficial effects of the above alternative embodiment are: through the arrangement, the circulation speed of the materials is obviously improved.
Alternatively, as shown in fig. 1, in some embodiments, the cross-sectional shapes of the cooling section 8, the low-temperature drying section 9, the medium-temperature drying section 10, and the high-temperature drying section 11 are identical.
In the above alternative embodiment, it should be noted that, in addition, the cross-sectional shapes of the cooling section 8, the low-temperature drying section 9, the medium-temperature drying section 10 and the high-temperature drying section 11 may also be set to be different.
The beneficial effects of the above alternative embodiment are: with the above arrangement, the drying tower 12 can be standardized, and the processing cost of the drying tower 12 can be reduced.
Alternatively, as shown in fig. 1, in some embodiments, the heights of the cooling section 8, the low-temperature drying section 9, the medium-temperature drying section 10, and the high-temperature drying section 11 are the same.
In the above alternative embodiment, it should be noted that, in addition, the heights of the cooling section 8, the low-temperature drying section 9, the medium-temperature drying section 10 and the high-temperature drying section 11 can also be set to be different.
The beneficial effects of the above alternative embodiment are: with the above arrangement, the drying tower 12 can be standardized, and the processing cost of the drying tower 12 can be reduced.
Alternatively, as shown in fig. 1, in some embodiments, the induced draft fan 1 is installed at the top of the furnace 4.
In the above alternative embodiment, it should be noted that, in addition, the induced draft fan 1 may also be installed at other positions of the furnace 4.
The beneficial effects of the above alternative embodiment are: through the arrangement, the working efficiency of the draught fan 1 is effectively improved.
Optionally, as shown in fig. 1, in some embodiments, a controller is further included, and the induced draft fan 1, the cold air blower 3, the cooling air blower 7, and the hot air blower 13 are all electrically connected to the controller.
In the above optional embodiments, it should be noted that the controller may be a PLC controller or a single chip controller, and in addition, a touch display screen may be further provided for controlling different modules of the entire apparatus.
The beneficial effects of the above alternative embodiment are: and the automatic control of the whole device is realized by arranging the controller.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.

Claims (5)

1. A hot air grain drying system with deep waste heat recovery is characterized by comprising an induced draft fan (1), a heat exchanger (2), an air cooler (3), a hearth (4), a feed hopper (5), a grate (6), a cooling fan (7), a drying tower (12) and an air heater (13); the below of furnace (4) is provided with grate (6), the lateral wall of furnace (4) be provided with grate (6) are connected feeder hopper (5), wear to be equipped with on the upper portion of furnace (4) heat exchanger (2), the entry of draught fan (1) with furnace (4) inside cavity intercommunication, the export of cooling fan (7) with drying tower (12) intercommunication, the export of drying tower (12) pass through the pipeline with air-cooler (3) intercommunication, the export of air-cooler (3) with the one end intercommunication of heat exchanger (2), the other end of heat exchanger (2) pass through the pipeline with air heater (13) intercommunication, the export of air heater (13) pass through the pipeline with drying tower (12) intercommunication.
2. The deep waste heat recovery hot air grain drying system according to claim 1, wherein the drying tower (12) comprises a cooling section (8), a low temperature drying section (9), a medium temperature drying section (10), and a high temperature drying section (11); the cooling section (8), the low-temperature drying section (9), the medium-temperature drying section (10) and the high-temperature drying section (11) are arranged from bottom to top in sequence.
3. The deep waste heat recovery hot air grain drying system according to claim 2, wherein an outlet of the cooling fan (7) is communicated with the cooling section (8), and an outlet of the hot air fan (13) is respectively communicated with the low temperature drying section (9), the medium temperature drying section (10) and the high temperature drying section (11) through pipelines.
4. A deep waste heat recovery hot air grain drying system according to claim 3, characterized in that the high temperature drying section (11) is also communicated with the furnace chamber (4) through a pipeline.
5. The deep waste heat recovery hot air grain drying system according to claim 4, wherein fuel is brought into the hearth (4) by the grate (6) through the feed hopper (5), the fuel and air undergo a combustion reaction in the hearth (4) to generate high temperature flue gas, the high temperature flue gas is extracted by the induced draft fan (1), and the high temperature flue gas is changed into low temperature flue gas after passing through the heat exchanger (2); the cooling fan (7) extracts air and sends the air into the cooling section (8) of the drying tower (12) to cool the dried grains; air-cooler (3) extraction process air and the air in the environment of intensification in cooling zone (8) get into heat exchanger (2) are in with the high temperature flue gas heat transfer in heat exchanger (2) to become high temperature air, high temperature air quilt air heater (13) are sent into respectively drying tower (12) low temperature drying section (9), medium temperature drying section (10) and high temperature drying section (11), carry out dry grain high temperature section (11) work back temperature reduction's air quilt draught fan (1) extraction to mixing portion ambient air gets into furnace (4) participates in the burning.
CN202110826993.8A 2021-07-21 2021-07-21 Deep waste heat recovery hot air grain drying system Pending CN113375434A (en)

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CN202110826993.8A CN113375434A (en) 2021-07-21 2021-07-21 Deep waste heat recovery hot air grain drying system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115435582A (en) * 2022-08-31 2022-12-06 青岛海信日立空调系统有限公司 Multistage waste heat recovery drying system and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115435582A (en) * 2022-08-31 2022-12-06 青岛海信日立空调系统有限公司 Multistage waste heat recovery drying system and control method thereof
CN115435582B (en) * 2022-08-31 2023-09-05 青岛海信日立空调系统有限公司 Multistage waste heat recovery drying system and control method thereof

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