CN112178915A - Hot air device - Google Patents
Hot air device Download PDFInfo
- Publication number
- CN112178915A CN112178915A CN202011128552.2A CN202011128552A CN112178915A CN 112178915 A CN112178915 A CN 112178915A CN 202011128552 A CN202011128552 A CN 202011128552A CN 112178915 A CN112178915 A CN 112178915A
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- Prior art keywords
- furnace body
- hot air
- air device
- inlet
- fan
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/025—Air heaters with forced circulation using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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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
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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
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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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
- F26B3/10—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 the gas or vapour carrying the materials or objects to be dried with it
- F26B3/12—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 the gas or vapour carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a hot air device, which comprises a furnace body with an inlet and an outlet, a burner arranged in the furnace body and a rectifying plate arranged at the inlet side of the furnace body, wherein the cross section of the rectifying plate is in a honeycomb shape. Through setting up honeycomb rectifying plate for the air current that gets into the furnace body distributes evenly and atmospheric pressure is suitable in whole runner, thereby is favorable to the combustor fully to burn, and then can shorten the distance between fan and the combustor, thereby can practice thrift equipment area, also can use to the factory building that the space is not enough.
Description
Technical Field
The invention relates to a hot air device.
Background
The hot air device in the prior art needs hot air to dry materials, such as coffee extract, and the like, and the hot air is usually obtained by blowing air by a blower and heating the air by burning by a burner. Because the combustor has a large requirement on air flow during combustion, if the air flow is too large, flame of the combustor can be blown out or fuel combustion can be influenced; if the air flow is too small or the air flow distribution is not uniform, the generated hot air is insufficient, and the fuel is not favorable for full combustion. In the prior art, a fan and a combustor are usually separated by more than 3-4 m so as to ensure the requirement of hot air. However, when the plant area is limited, the distance between the burner and the fan cannot be ensured.
Disclosure of Invention
The invention aims to provide a hot air device which reduces the floor area and can ensure the hot air requirement.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a hot air device which comprises a furnace body with an inlet and an outlet, a burner arranged in the furnace body, and a rectifying plate arranged at the inlet side of the furnace body, wherein the cross section of the rectifying plate is in a honeycomb shape.
The honeycomb rectifying plate is arranged, so that air flow entering the furnace body is uniformly distributed in the whole flow channel and the air pressure is proper, thereby being beneficial to full combustion of the combustor.
Preferably, a plurality of circular through holes are uniformly distributed on the cross section of the rectifying plate, the diameter of each circular through hole, the distance between the centers of two adjacent circular through holes in the transverse direction and the distance between the centers of two adjacent circular through holes in the longitudinal direction are obtained by optimizing CFD fluid analysis software according to set parameters, wherein the set parameters comprise the air flow rate of a fan outlet, the pressure difference between an inlet and an outlet of the fan, the area of the fan outlet and a furnace body inlet and the distance between the fan outlet and a combustor, so that the air flow distribution is more uniform.
According to a specific and preferred embodiment, the fan outlet area is 1.4 to 1.6m2The area of the furnace inlet is 3.8-4.2 m2The distance between the fan outlet and the combustor is 2-3 m, when the air speed of the fan outlet is 30-32 kg/s, the diameter of each circular through hole is 98-102 mm, the distance between the circle centers of every two adjacent horizontal circular through holes is 104-112 mm, and the distance between the circle centers of every two adjacent vertical circular through holes is 92-96 mm.
Preferably, the thickness of the rectifying plate is 1-10 mm, and preferably 2-4 mm.
Preferably, the furnace body is the cuboid type, the cross section of furnace body is the square, the rectifier plate size with the furnace body phase-match.
Preferably, the hot air device further comprises a flame arrester arranged on the outlet side of the furnace body, so that the hot air enters the spray drying tower after being more uniformly distributed, and the hot air is ensured not to carry any combustible substances and high temperature points.
Preferably, the distance between the rectifying plate and the combustor is 800-1200 mm, so that the airflow reaching the combustor is more uniform, and the air pressure is more suitable.
Preferably, the hot blast device further comprises a fuel system communicated with the burner, an ignition system communicated with the burner and a monitoring system arranged on the furnace body.
Further preferably, the furnace body, burner, deflector, flame arrestor, fuel system, ignition system and detection system may be integrated.
Further preferably, the fuel system comprises a gas pipeline communicated with the burner, a gas flowmeter mounted on the gas pipeline, and a gas filter located downstream of the gas flowmeter.
Further preferably, the ignition system comprises an ignition box and an ignition wire connected with the ignition box.
Preferably, the monitoring system comprises a flame detection rod and a pressure difference transmitter with a display which are inserted into the furnace body, and a control system which is communicated with the flame detection rod, the pressure difference transmitter with a display and the gas flowmeter, the combustion condition is monitored by the flame detection rod at any moment in the combustion process to ensure stable combustion, and meanwhile, the ratio of air to combustible gas is kept above 20:1 by comparing and analyzing data collected by sensors such as the pressure difference transmitter with a display and the gas flowmeter in real time to ensure sufficient combustion of rich oxygen and avoid danger factors such as insufficient combustion.
Preferably, the hot air device further comprises a cooling air interface communicated with the furnace body.
Preferably, the hot blast device further comprises an access hole formed in the furnace body.
Preferably, the hot air device further comprises a fan and a reducer pipe respectively connected with the fan and the inlet of the furnace body.
Further preferably, the length of the reducer pipe is less than or equal to 1.5 meters, so that the distance between the fan and the combustor can be shortened, and the occupied area is reduced.
Further preferably, the caliber of the reducer pipe gradually increases from the fan to the furnace body.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the invention, by optimizing the overall structure of the hot air device, particularly optimizing the honeycomb-shaped rectifying plate, on the premise of ensuring the hot air supply and the full combustion of the combustor, the distance between the fan and the combustor can be shortened, so that the occupied area of equipment can be saved, and the hot air device can be used for a factory building with insufficient space.
Drawings
FIG. 1 is a schematic diagram of the structure of an embodiment of a spray drying system;
FIG. 2 is a schematic view of the inlet side of the furnace body embodying the method;
FIG. 3 is a cross-sectional view of a furnace body embodying the method;
FIG. 4 is a partial front view of a hot air device according to an embodiment;
FIG. 5 is a front view of a fairing;
FIG. 6 is an enlarged view of a portion of FIG. 5;
FIG. 7 is a perspective view of one perspective of the established model;
FIG. 8 is a perspective view of another perspective of the established model;
FIG. 9 is an airflow roadmap for the modeled simulation;
FIG. 10 is a graph of inlet and outlet gas pressure with inlet gas pressure distribution on the left and inlet to outlet gas pressure distribution on the right;
FIG. 11 is a gas flow velocity profile for an inlet and an outlet, where the left side is the inlet gas flow velocity profile and the right side is the inlet to outlet gas flow velocity profile;
wherein, 1, a fan; 2. a reducer pipe; 3. a furnace body; 4. an air duct; 5. a spray drying tower; 31. a burner; 32. an air wing panel; 33. a cooling air interface; 34. an access hole; 35. a flame arrestor; 36. a rectifying plate; 37. a cooling air interface; 38. a flame detection rod; 39. an ignition wire; 310. a differential pressure transmitter with display; 311. an ignition box; 312. a gas filter; 313. a gas flow meter; 314. a flange-type ball valve; 315. a gas pipeline; l1, the distance between the centers of two adjacent circular through holes in the transverse direction; l2, and the transverse distance L2 between the centers of two adjacent circular through holes; H. the distance between the centers of circles of two longitudinally adjacent circular through holes; D. the diameter of the circular through hole; a. a model entrance; b. and (6) model outlet.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but the present invention is not limited to the following embodiments. The implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not indicated are generally the conditions in routine experiments.
The invention relates to a hot air device and a spray drying system adopting the same, wherein the honeycomb-shaped rectifying plate is designed in a furnace body, so that the technical problem of uneven air flow and air pressure in the prior art is effectively solved, meanwhile, the distance between a fan and a burner can be effectively shortened due to the design of the honeycomb-shaped rectifying plate, the occupied area of the hot air device is reduced, and the industrial application effect is obvious.
FIG. 1 is a schematic structural diagram of a spray drying system of the present invention, the spray drying system includes a blower 1, a furnace body 3, a spray drying tower 5, a reducer 2 communicating the blower 1 with the inlet of the furnace body 3, and an air duct 4 communicating the outlet of the furnace body 3 with the spray drying tower 5, the length of the reducer 2 is 1.5m, the reducer is 1.5mThe diameter of the reducer 2 is gradually increased from the fan 1 to the furnace body 3, the inlet of the reducer 2 is square and the area of the inlet is 1.5m2The outlet of the reducer pipe 2 is square and has an area of 4m2。
As shown in fig. 2-4, the furnace body 3 of an embodiment of the present invention is rectangular and has a through flow channel, the inlet and the outlet are respectively located at the front and the back opposite sides of the flow channel, a rectifying plate 36 with a thickness of 3mm is installed at the inlet side of the furnace body 3, the periphery of the rectifying plate 36 is fixedly arranged on the inner wall of the furnace body 3, the cross section of the rectifying plate 36 is square, and the cross section of the rectifying plate 36 has a plurality of circular through holes so that the air flow can enter the furnace body 3 through the rectifying plate 36; the combustor 31 is arranged in the furnace body 3 and is spaced 1000mm from the rectifying plate 36, the combustor 31 is of a Chinese character 'tian' structure, and the tail end of the combustor is provided with an air wing plate 32; a fire arrester 35 is arranged on the outlet side of the furnace body 3 and is used for isolating any combustible and high-temperature points from blowing into the spray drying tower 5 through the air inlet pipe 4. The middle position of the upper side of the furnace body 3 is provided with a cooling air interface 33 communicated with a flow channel in the furnace body 3 for introducing gas to cool the furnace body, the middle position of the lower side of the furnace body 3 is provided with a cooling air interface 37 communicated with the flow channel in the furnace body 3 for introducing gas to cool the furnace body, and the upper side of the furnace body 3 is provided with an access hole 34 for overhauling the furnace body. The furnace body 3 further comprises a fuel system communicated with the burner 31, an ignition system communicated with the burner 31 and a detection system arranged on the furnace body 3. The fuel system comprises a gas pipeline 315 communicated with the combustor 31, a gas filter 312 is arranged on the gas pipeline 315, and a gas flowmeter 313 and a flange ball valve 314 are sequentially arranged at the downstream of the gas filter 312; the ignition system comprises an ignition box 311 and an ignition wire 39, wherein one side of the ignition wire 39 is connected with the ignition box 311, and the other side is inserted into the furnace body 3; the monitoring system includes a flame detection rod 38 inserted into the furnace body, a differential pressure transmitter 310 with display, and a control system. The flame detection rod 38, the display type differential pressure transmitter 310 and the gas flowmeter 313 are connected with a control system, the combustion condition is monitored by the flame detection rod 38 at any time in the combustion process to ensure stable combustion, and meanwhile, the ratio of air to combustible gas is kept above 20:1 by comparing and analyzing data collected by the display type differential pressure transmitter 310, the gas flowmeter 313 and other sensors in real time to ensure sufficient combustion of rich oxygen and avoid dangerous factors such as insufficient combustion.
Fig. 5 is a front view of a rectifying plate according to an embodiment of the present invention, fig. 6 is a partial enlarged view of fig. 5, a plurality of circular through holes are uniformly distributed on a cross section of the rectifying plate 36, a diameter D of each circular through hole is 100mm, a distance between centers of two adjacent circular through holes in a transverse direction is L1 is 108mm, a transverse distance L2 between centers of two adjacent circular through holes in an upper and lower direction is 54mm, and a distance between centers of two adjacent circular through holes in a longitudinal direction is H94 mm. The design of the through holes on the rectifying plate 36 ensures that the air flow entering the furnace body is uniformly distributed in the whole flow channel and the air pressure is proper, thereby being beneficial to the full combustion of fuel gas. Due to the design of the rectifying plate 36, the distance between the fan 1 and the combustor 31 can be shortened, effective hot air drying can be carried out only when the traditional fan and the combustor are at least 3-4 m apart, and effective hot air drying can be realized only when the rectifying plate 36 is used and the fan 1 and the combustor 31 are at 1.5m apart.
When the air-flow rectifying device works, the fan 1 is turned on to blow air into the furnace body 3, and the air is rectified by the honeycomb rectifying plate 36, so that air flow entering the furnace body 3 is uniformly distributed in the whole flow channel and the air pressure is proper; opening the flange type ball valve 314, filtering the fuel gas by the fuel gas filter 312, and then feeding the fuel gas into the fuel gas pipeline 315, wherein the fuel gas pipeline 315 conveys the fuel gas into the combustor 31; the ignition system controls the ignition wire 39 to ignite to enable the gas in the combustor 31 to burn, the burning condition is monitored through the flame detection rod 38 at any time in the burning process to ensure stable burning, meanwhile, the ratio of air to combustible gas is kept above 20:1 through data acquisition and comparison analysis in real time by sensors with display pressure difference transmitters 310, gas flow meters 313 and the like, oxygen enrichment sufficient burning is ensured, and dangerous factors such as insufficient burning are avoided.
The hot air after burning is integrated again through spark arrester 35 and then enters into tuber pipe 4 to ensure that hot air does not take any combustible substance and high temperature point blows in spray drying tower 5 through tuber pipe 4 and carries out the drying to article, and article are accomplished the lower export outflow of drying tower 5 after the drying.
Fig. 7 to 10 are diagrams after modeling according to the parameters of the above embodiment, in which the inlet a of the model is the inlet of the reducer 3, the outlet b of the model is the cross section of the burner 31, the honeycomb-shaped flow plate 36 is located at the outlet of the reducer 3, the flow velocity of the air at the inlet of the reducer 3 is 31.5kg/s, the flow velocity of the air passing through the reducer 3 and reaching the burner 31 is uniform (see fig. 9), the pressure at the inlet a and the outlet b is not different from each other, the pressure at the outlet b is uniformly distributed (see fig. 10), and the flow velocity at the outlet b is uniform (see fig. 11).
The present invention is described in detail in order to make those skilled in the art understand the content and practice the present invention, and the present invention is not limited to the above embodiments, and all equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A hot blast apparatus comprising a furnace body having an inlet and an outlet, a burner mounted in the furnace body, characterized in that: the hot air device also comprises a rectifying plate arranged at the inlet side of the furnace body, and the cross section of the rectifying plate is honeycomb-shaped.
2. The hot air device according to claim 1, wherein: the cross section of the rectifying plate is uniformly distributed with a plurality of circular through holes, the diameter of each circular through hole, the distance between the circle centers of two adjacent circular through holes in the transverse direction and the distance between the circle centers of two adjacent circular through holes in the longitudinal direction are obtained after being optimized by CFD fluid analysis software according to set parameters, wherein the set parameters comprise the air flow rate of a fan outlet, the pressure difference of an inlet and an outlet being 0, the areas of the fan outlet and a furnace body inlet and the distance between the fan outlet and a combustor.
3. The hot air device according to claim 1, wherein: the thickness of the rectifier plate is 1-10 mm.
4. The hot air device according to claim 1, wherein: the furnace body is the cuboid type, the transversal square of personally submitting of furnace body, the rectifier plate size with the furnace body phase-match.
5. The hot air device according to claim 1, wherein: the hot air device also comprises a flame arrester arranged on the outlet side of the furnace body.
6. The hot air device according to claim 1, wherein: the distance between the rectifying plate and the combustor is 800-1200 mm.
7. The hot air device according to claim 1, wherein: the hot air device also comprises a fuel system communicated with the burner, an ignition system communicated with the burner and a monitoring system arranged on the furnace body.
8. The hot air device according to claim 1, wherein: the hot air device also comprises a fan and a reducer pipe respectively connected with the fan and the inlet of the furnace body.
9. The hot air device according to claim 8, wherein: the length of the reducer pipe is less than or equal to 1.5 meters.
10. The hot air device according to claim 8, wherein: the caliber of the reducer pipe is gradually increased from the fan to the furnace body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011128552.2A CN112178915A (en) | 2020-10-21 | 2020-10-21 | Hot air device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011128552.2A CN112178915A (en) | 2020-10-21 | 2020-10-21 | Hot air device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112178915A true CN112178915A (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011128552.2A Pending CN112178915A (en) | 2020-10-21 | 2020-10-21 | Hot air device |
Country Status (1)
| Country | Link |
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| CN (1) | CN112178915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112917864A (en) * | 2021-01-25 | 2021-06-08 | 宜宾天亿新材料科技有限公司 | Continuous preheating and drying device for PVC-O pipe fitting |
-
2020
- 2020-10-21 CN CN202011128552.2A patent/CN112178915A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112917864A (en) * | 2021-01-25 | 2021-06-08 | 宜宾天亿新材料科技有限公司 | Continuous preheating and drying device for PVC-O pipe fitting |
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