CN115183568A - Combined hot air drying method and system - Google Patents
Combined hot air drying method and system Download PDFInfo
- Publication number
- CN115183568A CN115183568A CN202210791112.8A CN202210791112A CN115183568A CN 115183568 A CN115183568 A CN 115183568A CN 202210791112 A CN202210791112 A CN 202210791112A CN 115183568 A CN115183568 A CN 115183568A
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- CN
- China
- Prior art keywords
- air
- hot air
- waste heat
- heat exchanger
- flue gas
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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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
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
Abstract
The invention relates to a combined hot air drying method and a combined hot air drying system, and belongs to the technical field of metal heat treatment. Providing a waste heat exchanger with a switching valve, connecting the waste heat exchanger to an air box through a hot air duct, and heating metal to be heated in the air box; the waste heat exchanger realizes the switching of different heat sources through a switching valve. The waste heat exchanger is sequentially provided with a waste heat exchanger, a hot air pipe, a centrifugal fan, a hot air duct and an air box along the gas flowing direction, and the waste heat exchanger is provided with a flue gas inlet, a flue gas outlet, a first air branch and a second air branch; the switching valve comprises a first gear and a second gear, and when the switching valve is positioned at the first gear, the flue gas inlet, the flue gas outlet and the first air branch are connected to the hot air pipe; when the second gear is located, the second air branch is communicated to the hot air pipe; the hot air duct is internally provided with a burner, can be heated and dried by using a direct combustion burner and can also be heated and dried by using waste heat, and can realize real-time online switching of a heat source.
Description
Technical Field
The invention belongs to the technical field of metal heat treatment, and relates to a combined hot air drying method and system.
Background
The continuous heat treatment lines for the thin plates are commonly a continuous annealing line and a continuous galvanizing line, and in each treatment line, a plurality of drying devices are needed for drying strip steel, otherwise, the strip steel is easy to slip.
In the heat treatment line, all can dispose heat treatment furnace, the common heating methods of heat treatment furnace is exactly the nozzle heating, the high temperature flue gas that produces after the nozzle burning, if direct emission, the energy waste is more serious, so, will set up air-flue gas waste heat recovery heat exchanger on the flue, with the flue gas with air heating back, send to other thermal devices of need of production line through the waste heat utilization pipeline and use, wherein, there is hot air drying device. The flue gas volume that the heat treatment furnace produced is directly proportional with production line output, and that is to say that production line output is the bigger, and the flue gas volume that produces is more, and flue gas temperature just is higher more, and the heat that the flue gas carried is just more, and on the contrary output is smaller, and the flue gas volume that produces is less, and the heat that the flue gas carried is just less, and the waste heat just can face the condition not enough, especially under the low condition of output in winter, more serious.
A plurality of drying device arrange each position at producing the line, and drying device dries to the belted steel with hot-blast coming, and the stoving effect receives to produce the line output and influences great, causes hot-blast temperature unstability easily, and the stoving effect is not ideal, is used for the hot-blast main sometimes even to reach 100 more meters, and calorific loss is great, especially in winter, under the condition that ambient temperature is low, the condition that can't dry appears often, and then further influences and produces line product quality and output.
Disclosure of Invention
In view of this, the present invention aims to provide a combined hot air drying method and system, which uses a direct-fired burner to heat under the condition of insufficient residual heat of flue gas, and realizes drying by combining the direct-fired burner and the residual heat.
In order to achieve the purpose, the invention provides the following technical scheme:
a combined hot air drying method is characterized in that a waste heat exchanger with a switching valve is provided, the waste heat exchanger is connected to an air box through a hot air duct, and metal to be heated is heated in the air box; the waste heat exchanger switches an air inlet air path through a switching valve, and provides a first air path for entering smoke and a second air path for entering normal-temperature air; one of the first air path and the second air path is communicated to a hot air duct; when the first air path is connected to the hot air duct, the metal to be heated in the air box is heated by using the waste heat of the flue gas; when the second air path is connected to the hot air channel, the burner in the hot air channel is opened, and the combustion heat is utilized to heat the metal to be heated in the air box.
Optionally, when the first air path is connected to the hot air duct, normal temperature air is introduced into the first air path to adjust the temperature of the flue gas.
Optionally, when the second air path is connected to the hot air duct, the clean air after burning by the burner and the normal temperature air introduced by the second air path are uniformly mixed and then enter the wind box.
Optionally, the temperature in the hot air duct is monitored in real time, and the combustion power of the burner is fed back and controlled, so as to obtain stable hot air.
A combined hot air drying system utilizes the combined hot air drying method to provide the following devices: the waste heat exchanger is sequentially provided with a waste heat exchanger, a hot air pipe, a centrifugal fan, a hot air duct and an air box along the gas circulation direction, and the waste heat exchanger is provided with a flue gas inlet, a flue gas outlet, a first air branch and a second air branch; the second air branch is provided with a switching valve, the switching valve comprises a first gear and a second gear, and when the switching valve is positioned at the first gear, the flue gas inlet, the flue gas outlet and the first air branch are connected to the hot air pipe; when the gear is at the second gear, the second air branch is communicated to the hot blast pipe; the centrifugal fan is used for introducing gas in the hot air pipe into the hot air channel; and a burner is arranged in the hot air duct.
Optionally, an air equalizing plate is arranged between the burner and the air box.
Optionally, nozzles are arranged in the wind box, the nozzles are symmetrically arranged on two sides of the wind box, and the metal to be heated penetrates through the nozzles arranged on the two sides of the wind box.
Optionally, an adjusting valve is arranged on the burner, and the combustion power of the burner is adjusted through the adjusting valve.
Optionally, a thermocouple for detecting the temperature of the gas inside the hot air pipeline is arranged in the hot air pipeline.
Optionally, the switching valve is a rotary switching valve.
The invention has the beneficial effects that:
the invention provides a combined hot air drying system, which can utilize direct combustion type burners for heating and drying, can also utilize waste heat for heating and drying, can realize real-time online switching of heat sources, has high production line yield, and utilizes the waste heat to heat drying air under the condition of enough waste heat, and adopts the direct combustion type burners with low temperature and low emission to heat the drying air under the condition of low production line yield and insufficient waste heat, the fuel adopts clean natural gas, strip steel passes through a drying device, a nozzle is arranged in the drying device to dry the strip steel, in order to solve the problems of low heat exchange efficiency and high energy consumption, the direct combustion type burners are arranged in an air channel, the clean gas after combustion and air are directly mixed, the surface of the strip steel is sprayed and dried after the strip steel is uniformly mixed by an air equalizing plate, a thermocouple arranged on the air channel and an adjusting valve for controlling the power output of the burners form a closed loop, and the temperature of hot air can be automatically adjusted according to the temperature of the hot air and the drying condition.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a plan view of the system of the present invention;
fig. 2 is an elevation view of the system of the present invention.
Reference numerals are as follows: the device comprises a waste heat exchanger 1, a flue gas inlet 2, a first air branch 3, a second air branch 4, a switching valve 5, a centrifugal fan 6, a regulating valve 7, a burner 8, a hot air duct 9, a nozzle 10, an air box 11, an air equalizing plate 12, a thermocouple 13, strip steel 14 and a hot air pipe 15.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and embodiments may be combined with each other without conflict.
Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the invention, shown in the drawings are schematic representations and not in the form of actual drawings; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and the specific meaning of the terms described above will be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 2, the present invention discloses a combined hot air drying system, which is sequentially provided with a waste heat exchanger 1, a hot air pipe 15, a centrifugal fan 6, a hot air duct 9, and an air box 11 along a gas flowing direction, wherein the waste heat exchanger 1 is provided with a flue gas inlet 2, a flue gas outlet, a first air branch 3, and a second air branch 4; the second air branch 4 is provided with a switching valve 5, the switching valve 5 comprises a first gear and a second gear, and when the switching valve is positioned at the first gear, the flue gas inlet 2, the flue gas outlet and the first air branch 3 are connected to the hot air pipe 15; when the gear is at the second gear, the second air branch 4 is communicated to the hot blast pipe 15; the centrifugal fan 6 is used for introducing gas in the hot air pipe 15 into the hot air duct 9; and a burner 8 is arranged in the hot air duct 9.
In this embodiment, an air equalizing plate 12 is arranged between the burner 8 and the air box 11; nozzles 10 are arranged in the air box 11, the nozzles 10 are symmetrically arranged on two sides of the air box 11, and the metal to be heated penetrates through the nozzles 10 arranged on the two sides of the air box 11; an adjusting valve 7 is arranged on the burner 8, and the combustion power of the burner 8 is adjusted through the adjusting valve 7; a thermocouple 13 for detecting the temperature of the gas in the hot air pipe 15 is arranged in the hot air pipe; the switching valve 5 is a rotary switching valve.
When the production line yield is high, the heat treatment furnace generates a large amount of high-temperature flue gas, the waste heat is enough, the switching valve 5 is located at the position 1 (reference numeral 16), the high-temperature flue gas from the heat treatment furnace is conveyed through the flue gas inlet 2, the high-temperature flue gas passes through the waste heat exchanger 1, the normal-temperature air enters the waste heat exchanger 1 through the first air branch 3, the normal-temperature air and the high-temperature flue gas exchange heat at the position to obtain hot air, the hot air passes through the hot air pipe 15 and enters the centrifugal fan 6, the hot air is sent into the hot air duct 9 by the centrifugal fan 6 and enters the air box 11, the nozzles 10 are arranged up and down and are arranged on the upper side and the lower side of the air box 11, the strip steel 14 passes through the air box 11, and the strip steel 14 is dried by hot air at the position.
When the production line yield is low, a small amount of high-temperature flue gas is generated by the heat treatment furnace, waste heat is not enough at the moment, the switching valve 5 is located at the position 2 (marked 17), normal-temperature air enters the hot air pipe 15 through the second air branch 4, the normal-temperature air enters the centrifugal fan 6 through the hot air pipe 15, the centrifugal fan 6 sends the normal-temperature air into the hot air duct 9, a burner 8 is arranged in the hot air duct 9, the burner 8 is opened at the moment, the combusted flue gas and the normal-temperature air are mixed to form hot air, the hot air is uniformly obtained through the air-equalizing plate 12 and then enters the air box 11, the nozzles 10 are arranged up and down and are arranged on the upper side and the lower side of the air box 11, strip steel 14 passes through the air box 11, the strip steel 14 is dried by the hot air, the power of the burner 8 is adjusted by the adjusting valve 7 according to the actual temperature value of the hot air fed back by the thermocouple 13, so as to obtain stable hot air, and the process can be automatically adjusted according to the set temperature of the thermocouple 13.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A combined hot air drying method is characterized in that: providing a waste heat exchanger with a switching valve, connecting the waste heat exchanger to an air box through a hot air duct, and heating metal to be heated in the air box; the waste heat exchanger switches an air inlet air path through a switching valve to provide a first air path for entering smoke and a second air path for entering normal-temperature air; the first air passage and the second air passage are alternatively communicated to the hot air passage; when the first air path is connected to the hot air duct, the metal to be heated in the air box is heated by using the waste heat of the flue gas; when the second air path is connected to the hot air channel, the burner in the hot air channel is opened, and the combustion heat is utilized to heat the metal to be heated in the air box.
2. The combined hot air drying method according to claim 1, wherein: when the first air passage is connected to the hot air passage, normal temperature air is introduced into the first air passage to regulate the temperature of the smoke.
3. The combined hot air drying method according to claim 1, wherein: when the second air passage is connected to the hot air passage, the clean air after burning of the burner nozzle and the normal temperature air introduced by the second air passage are uniformly mixed and then enter the wind box.
4. The combined hot air drying method according to claim 1, wherein: and monitoring the temperature in the hot air duct in real time, and feeding back and controlling the combustion power of the burner so as to obtain stable hot air.
5. A combined hot air drying system, characterized in that, by using the combined hot air drying method of any one of claims 1 to 4, the following devices are provided: the waste heat exchanger is sequentially provided with a waste heat exchanger, a hot air pipe, a centrifugal fan, a hot air duct and an air box along the gas circulation direction, and the waste heat exchanger is provided with a flue gas inlet, a flue gas outlet, a first air branch and a second air branch; a switching valve is arranged on the second air branch and comprises a first gear and a second gear, and when the switching valve is positioned at the first gear, the flue gas inlet, the flue gas outlet and the first air branch are connected to the hot air pipe; when the gear is at the second gear, the second air branch is communicated to the hot blast pipe; the centrifugal fan is used for introducing gas in the hot air pipe into the hot air channel; and a burner is arranged in the hot air duct.
6. The combined hot air drying system of claim 5, wherein: and an air equalizing plate is arranged between the burner and the air box.
7. The combined hot air drying system of claim 5, wherein: the heating device is characterized in that nozzles are arranged in the air box, the nozzles are symmetrically arranged on two sides of the air box, and metal to be heated penetrates through the nozzles arranged on the two sides of the air box.
8. The combined hot air drying system of claim 5, wherein: and the burner is provided with an adjusting valve, and the combustion power of the burner is adjusted through the adjusting valve.
9. The combined hot air drying system of claim 5, wherein: and a thermocouple for detecting the temperature of the gas in the hot air pipeline is arranged in the hot air pipeline.
10. The combined hot air drying system of claim 5, wherein: the switching valve is a rotary switching valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210791112.8A CN115183568A (en) | 2022-07-05 | 2022-07-05 | Combined hot air drying method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210791112.8A CN115183568A (en) | 2022-07-05 | 2022-07-05 | Combined hot air drying method and system |
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| Publication Number | Publication Date |
|---|---|
| CN115183568A true CN115183568A (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210791112.8A Pending CN115183568A (en) | 2022-07-05 | 2022-07-05 | Combined hot air drying method and system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285212Y (en) * | 2008-10-23 | 2009-08-05 | 宝山钢铁股份有限公司 | Low-temperature flue gas exhaust heat recycle apparatus |
| CN206430540U (en) * | 2016-12-30 | 2017-08-22 | 武汉钢铁工程技术集团有限责任公司节能分公司 | A kind of drying furnace system of temperature automatic adjustment control |
| CN208012343U (en) * | 2018-03-29 | 2018-10-26 | 广州市新陶机械制造有限公司 | Combustion chamber for body drying |
| CN109827407A (en) * | 2017-11-23 | 2019-05-31 | 桂林洁宇环保科技有限责任公司 | A kind of strip enclosed drying unit |
| CN111649577A (en) * | 2020-06-09 | 2020-09-11 | 宜都华宜智能科技有限公司 | Energy-saving system of tea leaf drying hot-blast stove and use method |
| CN214502114U (en) * | 2021-03-04 | 2021-10-26 | 昌黎冀东水泥有限公司 | Rotary kiln heat recycling device |
-
2022
- 2022-07-05 CN CN202210791112.8A patent/CN115183568A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285212Y (en) * | 2008-10-23 | 2009-08-05 | 宝山钢铁股份有限公司 | Low-temperature flue gas exhaust heat recycle apparatus |
| CN206430540U (en) * | 2016-12-30 | 2017-08-22 | 武汉钢铁工程技术集团有限责任公司节能分公司 | A kind of drying furnace system of temperature automatic adjustment control |
| CN109827407A (en) * | 2017-11-23 | 2019-05-31 | 桂林洁宇环保科技有限责任公司 | A kind of strip enclosed drying unit |
| CN208012343U (en) * | 2018-03-29 | 2018-10-26 | 广州市新陶机械制造有限公司 | Combustion chamber for body drying |
| CN111649577A (en) * | 2020-06-09 | 2020-09-11 | 宜都华宜智能科技有限公司 | Energy-saving system of tea leaf drying hot-blast stove and use method |
| CN214502114U (en) * | 2021-03-04 | 2021-10-26 | 昌黎冀东水泥有限公司 | Rotary kiln heat recycling device |
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