CN109127323B - Dual cycle drying system - Google Patents
Dual cycle drying system Download PDFInfo
- Publication number
- CN109127323B CN109127323B CN201811153855.2A CN201811153855A CN109127323B CN 109127323 B CN109127323 B CN 109127323B CN 201811153855 A CN201811153855 A CN 201811153855A CN 109127323 B CN109127323 B CN 109127323B
- Authority
- CN
- China
- Prior art keywords
- drying chamber
- heat exchanger
- regional
- fresh air
- temperature gas
- Prior art date
- 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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Links
- 238000001035 drying Methods 0.000 title claims abstract description 75
- 230000009977 dual effect Effects 0.000 title claims description 7
- 239000007789 gas Substances 0.000 claims abstract description 68
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 239000002912 waste gas Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 239000000284 extract Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a double-circulation drying system, which comprises an exhaust gas incinerator, a central heat exchanger for providing high-temperature gas for a regional drying chamber and a fresh air heat exchanger for providing heated fresh air for the regional drying chamber, wherein a high-temperature flue gas discharge pipe of the exhaust gas incinerator is sequentially led into the central heat exchanger and the fresh air heat exchanger; the central heat exchanger is connected with an air inlet pipeline of a regional circulating fan for realizing the air circulation flow in the regional drying chamber through a high-temperature gas pipeline and a branch high-temperature gas pipeline with a mixing valve, wherein the branch high-temperature gas pipeline is connected with the high-temperature gas pipeline; the rear section of the high-temperature gas pipeline is connected with an extraction opening of a heating circulating fan for providing circulating hot air for the central heat exchanger and is connected with the regional drying chamber through an exhaust pipe with an exhaust air valve, so that gas which does not enter the regional drying chamber in the regional drying chamber and the high-temperature flue gas channel is extracted into the central heat exchanger for heat exchange. The invention improves response capability and enhances stability of a drying system.
Description
Technical Field
The invention relates to the technical field of drying systems in the coating industry, in particular to a double-circulation drying system.
Background
Conventional automobile drying systems are generally classified into two types, one is a mode in which an independent combustion heating box indirectly supplies heat to a drying chamber and RTO processes exhaust gas, and the other is a mode in which a heat exchange heating box indirectly supplies heat to the drying chamber and an exhaust gas incinerator burns natural gas as a heat source and simultaneously processes exhaust gas. Because the burnt waste gas is not clean and can not be directly communicated into the drying chamber for direct heating, the two modes are indirect heat exchange between the heat source and the drying chamber, the response speed is slower, and the temperature control is unstable; meanwhile, as the indirect heat exchange needs the heat exchanger, each area needs to be provided with the heat exchanger, the occupied area of the equipment is large, and the heat dissipation capacity is relatively large.
Disclosure of Invention
The invention aims at overcoming the technical defects in the prior art, and provides a double-circulation drying system for improving response capability and system stability.
The technical scheme adopted for realizing the purpose of the invention is as follows:
The double-circulation drying system comprises an exhaust gas incinerator, a central heat exchanger for providing high-temperature gas for the regional drying chamber and a fresh air heat exchanger for providing heated fresh air for the regional drying chamber, wherein a high-temperature flue gas discharge pipe of the exhaust gas incinerator is sequentially introduced into the central heat exchanger and the fresh air heat exchanger so as to provide heat exchange heat energy for the central heat exchanger and the fresh air heat exchanger;
The central heat exchanger is connected with a branch high-temperature gas pipeline with a mixing valve connected with the high-temperature gas pipeline through a high-temperature gas pipeline, and is arranged outside the regional drying chamber and used for realizing the air circulation flow in the regional drying chamber; the rear section of the high-temperature gas pipeline is connected with an extraction opening of a heating circulating fan for providing circulating hot air for the central heat exchanger and is connected with the regional drying chamber through an exhaust pipe with an exhaust air valve, so that heat exchange is realized by extracting gas in the regional drying chamber and the high-temperature flue gas channel, which does not enter the regional drying chamber, into the central heat exchanger.
The exhaust gas blower is installed on the exhaust gas introducing pipe of the exhaust gas incinerator, and the exhaust gas introducing pipe is connected into the regional drying chamber so as to suck exhaust gas from each drying chamber and enter the exhaust gas incinerator for incineration treatment.
The fresh air outlet of the fresh air heat exchanger is connected with the regional drying chamber through a fresh air inlet pipe.
The fresh air heat exchanger is connected with a fresh air fan.
The invention changes the distributed heat exchange into concentrated heat exchange, and simultaneously changes the original indirect heat exchange heating box into direct air mixing heating, thereby reducing the manufacturing and installation difficulty of the equipment; because each area is not required to be provided with a heat exchanger, the volume and the surface area of the whole system are reduced, and the heat loss is reduced. Compared with an indirect heat exchange method, the direct air mixing heating improves the response speed of the whole system, and meanwhile is beneficial to realizing the accurate control of the temperature of each region.
Drawings
Fig. 1 is a schematic structural view of a dual circulation drying system of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a dual circulation drying system includes:
The system comprises an exhaust gas incinerator 1, a central heat exchanger 2 for providing high-temperature gas for a regional drying chamber and a fresh air heat exchanger 3 for providing heated fresh air for the regional drying chamber, wherein a high-temperature flue gas discharge pipe 10 of the exhaust gas incinerator is sequentially introduced into the central heat exchanger and the fresh air heat exchanger so as to provide heat exchange heat energy for the central heat exchanger and the fresh air heat exchanger, and the heat exchange heat energy is directly discharged into the atmosphere after heat exchange;
The central heat exchanger is connected with air inlet pipelines of a regional circulating fan 13 which is arranged outside a plurality of regional drying chambers 6 and is used for realizing the air circulation flow in the regional drying chambers through a high-temperature gas pipeline 10 and each high-temperature gas pipeline with a mixing valve 12 connected with the high-temperature gas pipeline; the rear section of the high-temperature gas pipeline is connected with an extraction opening of a heating circulating fan 5 for providing circulating hot air for the central heat exchanger and is connected with each separated regional drying chamber 6 through an exhaust pipe with an exhaust air valve 7 so as to realize that flue gas which does not enter the regional drying chamber in the regional drying chamber and the high-temperature flue gas channel is extracted into the central heat exchanger 1 for heat exchange;
and the fresh air reaching the process temperature after heat exchange of the fresh air heat exchanger is discharged into the regional drying chamber through a fresh air discharge pipe 8 connected with the regional drying chamber, so that the concentration of voc in the drying chamber is reduced.
The exhaust gas blower 4 is installed on the exhaust gas introducing pipe 9 of the exhaust gas incinerator, and the exhaust gas introducing pipe is connected into the regional drying chamber so as to suck exhaust gas from each drying chamber into the exhaust gas incinerator for incineration treatment.
In the present invention, the side wall of the exhaust gas introducing pipe 9 connected to the exhaust gas blower 4 may be connected to a plurality of exhaust gas introducing branch pipes (not shown) leading to the drying chambers of each region through a pipeline, so as to integrate the exhaust gas in the drying chambers of the plurality of regions and introduce the integrated exhaust gas into the exhaust gas incinerator for incineration treatment, just like the connection mode of the exhaust pipe and the rear section of the high temperature gas pipeline; the side walls of the fresh air supply line 8 may also be connected to a plurality of fresh air supply branches (not shown) which open into the respective drying chambers of the respective areas by means of a connecting line, so that fresh air is supplied to the respective drying chambers of the respective areas.
The invention has the following characteristics:
1) The flue gas burnt by the waste gas incinerator does not exchange heat with the existing heat exchange heating boxes of all areas one by one, exchanges heat with the central heat exchanger, exchanges heat with the fresh air heat exchanger, and is directly discharged to the atmosphere.
2) And pumping air from the regional drying chamber through a heat supply circulating fan into a central heat exchanger, and feeding the air into a high-temperature gas pipeline after heat exchange and temperature rise of the central heat exchanger.
3) The high-temperature flue gas pipe sends high-temperature gas into each region through the air mixing valve, then sends the high-temperature gas into each region drying chamber through the region circulating fan, and controls the process temperature of each region by controlling the opening of the air mixing valve, thereby completing the direct air mixing heat supply cycle in the drying chamber.
4) The exhaust air valves of all the areas are associated with the air mixing valve, and the heat supply circulating fan extracts gas in the drying chamber through the exhaust air valve and enters the central heat exchanger together with high-temperature gas which does not enter the drying chamber through the high-temperature flue gas pipe, so that indirect heat exchange circulation of the system outside the drying chamber is completed.
5) And a fresh air heat exchanger is arranged, fresh air is extracted by a fresh air fan, enters the fresh air heat exchanger, exchanges heat with flue gas, and is sent into the drying chamber body after reaching the process temperature, so that the concentration of voc in the drying chamber is reduced.
6) Simultaneously, the waste gas incinerator pumps waste gas from the drying chamber through the waste gas pumping fan, the waste gas is incinerated through natural gas combustion, high-temperature flue gas meeting emission requirements after treatment sequentially enters the central heat exchanger and the fresh air heat exchanger, and the waste gas is discharged to the atmosphere after heat exchange and cooling.
The invention has the following beneficial effects
1) The distributed heat exchange is changed into concentrated heat exchange, and meanwhile, the original indirect heat exchange heating box is changed into direct air mixing heating, so that the manufacturing and installation difficulty of equipment is reduced;
2) Because each area is not required to be provided with a heat exchanger, the volume and the surface area of the whole system are reduced, and the heat loss is reduced.
3) Compared with an indirect heat exchange method, the direct air mixing heating improves the response speed of the whole system, and meanwhile is beneficial to realizing the accurate control of the temperature of each region.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The double-circulation drying system is characterized by comprising an exhaust gas incinerator, a central heat exchanger for providing high-temperature gas for a regional drying chamber and a fresh air heat exchanger for providing heated fresh air for the regional drying chamber, wherein a high-temperature flue gas discharge pipe of the exhaust gas incinerator is sequentially introduced into the central heat exchanger and the fresh air heat exchanger so as to provide heat exchange heat energy for the central heat exchanger and the fresh air heat exchanger; the waste gas introducing pipe of the waste gas incinerator is connected into the regional drying chamber so as to pump waste gas from each drying chamber into the waste gas incinerator for incineration treatment;
The central heat exchanger is connected with a branch high-temperature gas pipeline with a mixing valve connected with the high-temperature gas pipeline through a high-temperature gas pipeline, and is arranged outside the regional drying chamber and used for realizing the air circulation flow in the regional drying chamber; the rear section of the high-temperature gas pipeline is connected with an extraction opening of a heating circulating fan for providing circulating hot air for the central heat exchanger and is connected with the regional drying chamber through an exhaust pipe with an exhaust air valve so as to realize that gas in the regional drying chamber and the high-temperature gas pipeline which does not enter the regional drying chamber is extracted into the central heat exchanger for heat exchange;
The high-temperature gas pipeline sends high-temperature gas into each region through the mixing valve, then sends the high-temperature gas into each region drying chamber through the region circulating fan, and controls the process temperature of each region by controlling the opening of the mixing valve to complete the direct air mixing heat supply cycle in the drying chamber; the heat supply circulating fan extracts gas in the drying chamber through the exhaust air valve and enters the central heat exchanger together with high-temperature gas which does not enter the drying chamber in the high-temperature gas pipeline, so that indirect heat exchange circulation of the system outside the drying chamber is completed.
2. The dual circulation drying system of claim 1, wherein the exhaust gas introduction pipe is provided with an exhaust gas blower.
3. The dual cycle drying system of claim 2, wherein the fresh air outlet of the fresh air heat exchanger is connected to the regional drying chamber through a fresh air inlet pipe.
4. The dual cycle drying system of claim 1, wherein the fresh air heat exchanger is connected to a fresh air fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811153855.2A CN109127323B (en) | 2018-09-30 | 2018-09-30 | Dual cycle drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811153855.2A CN109127323B (en) | 2018-09-30 | 2018-09-30 | Dual cycle drying system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109127323A CN109127323A (en) | 2019-01-04 |
| CN109127323B true CN109127323B (en) | 2024-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811153855.2A Active CN109127323B (en) | 2018-09-30 | 2018-09-30 | Dual cycle drying system |
Country Status (1)
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|---|---|
| CN (1) | CN109127323B (en) |
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| CN109127323A (en) | 2019-01-04 |
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