CN100540119C - A kind of color-coating waste gas heat recovery method - Google Patents
A kind of color-coating waste gas heat recovery method Download PDFInfo
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- CN100540119C CN100540119C CNB2007100702521A CN200710070252A CN100540119C CN 100540119 C CN100540119 C CN 100540119C CN B2007100702521 A CNB2007100702521 A CN B2007100702521A CN 200710070252 A CN200710070252 A CN 200710070252A CN 100540119 C CN100540119 C CN 100540119C
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- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- 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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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention relates to a kind of color-coating waste gas heat recovery method.It mainly is to solve when the existing in prior technology waste gas heat reclaims to handle the pernicious gas that contains organic solvent, easily the problem that air is polluted; It is temperature required higher that the present invention has also solved baking oven, needs the new wind of extra heating temperature required to baking oven, the technical problem that energy waste is bigger.The steps include: and to pass through this machine heat exchanger from the waste gas of baking oven, feed this machine heat exchanger again through heating by the exhaust gases chamber, catalytic bed; High-temperature gas after waste gas and the catalysis carries out heat exchange, and is heated to the catalysis initiation temperature; The waste gas that is heated to the catalysis initiation temperature enters catalytic bed and carries out catalytic reaction; High-temperature gas after the catalysis feeds other equipment hot water heat exchangers behind fresh air heat exchanger and the new air heat-exchange from air filtration, new wind blower fan; New wind from air filtration, new wind blower fan is heated by fresh air heat exchanger, sends into the baking oven wind circulating system.
Description
Technical field
The present invention relates to the method that a kind of waste gas circulation is utilized, especially relate to a kind of color-coating waste gas heat recovery method.
Background technology
The color coating production process needs the coating material that contains organic solvent is applied on the band, and coating material is in solidification process, and organic solvent will volatilize.If organic solvent discharging does not accumulate to finite concentration and will explode, directly discharging pollutes the environment.Chinese patent discloses a kind of waste gas heat energy from enamelled wire dip oven and has utilized method (publication number: CN1967117A), it is concentrated the hot waste gas in the enamelled wire dip oven and gives off by a discharge duct, and on this discharge duct, heat exchanger is set, utilize the heat energy from waste gas in the discharge duct that the mobile cold air in the heat exchanger is heated, the baking heat energy that heated hot-air in the heat exchanger is guided in the enamel-covered wire baking operation as the Baking Paint envelope curve by pipeline uses then.Its device that is used for the waste gas heat energy from enamelled wire dip oven utilization comprises the conveying device that is used to carry enamel-covered wire of enamelled wire dip oven and enamel-covered wire baking operation, on enamelled wire dip oven, be provided with a discharge duct, 1～6 heat exchanger is installed on discharge duct, and a pressure fan is installed all on the air inlet of each heat exchanger, be connected with a hot blast conveying pipe on the air outlet of each heat exchanger, the air outlet of hot blast conveying pipe is located at the conveying device that is used to carry enamel-covered wire in the enamel-covered wire baking operation.Be connected with an oven dry tube on the air outlet of hot blast conveying pipe, the oven dry tube is located at the conveying device that is used to carry enamel-covered wire in the enamel-covered wire baking operation, and the enamel-covered wire on the conveying device passes the oven dry tube.But this process equipment can't directly be applied on the color coating treatment of waste gas, and generally contains pernicious gas in the waste gas, uses said method to carry out can't handling pernicious gas after the recuperation of heat.And normally used method is, as Fig. 1, baking oven is introduced a certain amount of new wind and guaranteed that the concentration of organic solvent in the baking oven can be not too high, and the waste gas that comprises organic solvent of being extruded baking oven by new wind is heated to ignition temperature, makes it to be discharged in the air after the burning.Organic solvent burning back generates carbon dioxide and water does not pollute air.But because baking oven is temperature required higher, and the temperature of new wind is 20 ℃～40 ℃ of normal temperature.It is temperature required to baking oven just will additionally to heat new wind, and this is very big energy waste, and waste gas is heated to the also very big heat of need of ignition temperature.
Summary of the invention
The purpose of this invention is to provide a kind of color-coating waste gas heat recovery method, it mainly is to solve when the existing in prior technology waste gas heat reclaims to handle the pernicious gas that contains organic solvent, easily the problem that air is polluted; It is temperature required higher that the present invention has also solved baking oven, needs the new wind of extra heating temperature required to baking oven, and energy waste is bigger, and waste gas is heated to the technical problem that ignition temperature also needs big heat very etc.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
Color-coating waste gas heat recovery method of the present invention is characterized in that:
A, will feed this machine heat exchanger again through heating by the exhaust gases chamber, catalytic bed from the waste gas of baking oven by this machine heat exchanger; High-temperature gas after waste gas and the catalysis carries out heat exchange, and is heated to the catalysis initiation temperature; When heat exchange starts and when the EGT that this machine heat exchanger comes out is lower than the catalysis initiation temperature, at preheating chamber waste gas is heated to the catalysis initiation temperature by combustor;
B. the waste gas that is heated to the catalysis initiation temperature enters catalytic bed and carries out catalytic reaction, adds catalyst P
t, P
d, be converted into moisture off-gas oxidizing and high-temperature gas carbon dioxide;
C. the high-temperature gas after the catalysis feeds other equipment hot water heat exchangers behind fresh air heat exchanger and the new air heat-exchange from air filtration, new wind blower fan;
D. the new wind from air filtration, new wind blower fan is heated by fresh air heat exchanger, sends into the baking oven wind circulating system.
Step a reaches catalysis initiation temperature after-combustion machine and quits work, and system relies on waste gas reaction heat to keep the thermal balance of system, reaches best idle running status.
Waste gas among the step b is organic matter benzene class, and its main component is C
8H
10, the reaction formula is:
The principle of Production by Catalytic Combustion Process treatment and purification waste gas: organic exhaust gas is under the prerequisite of lower catalysis initiation temperature, rely on the active component platinum Pt in the catalyst, the catalyzed conversion effect of palladium Pd, organic matter in the waste gas is transformed be oxidized to harmless water and carbon dioxide to reach the purpose of purifying exhaust air.Waste gas relies on extraneous electrical heating or fuel-firing gas-firing heat make-up heat to reach the catalysis initiation temperature when low concentration under suitable temperature conditions; When at suitable concentration 5g/m
3Under the condition, system relies on the waste gas reaction heat release to keep required thermal balance fully; Reach best idle running status.And under appropriate condition, can carry out UTILIZATION OF VESIDUAL HEAT IN, purifying exhaust air protection environment not only, the UTILIZATION OF VESIDUAL HEAT IN generation certain economic benefits that turns waste into wealth simultaneously.
By above-mentioned technology, the new wind that replenishes back baking oven is heated by the waste gas after burning heat, make new wind be heated to 270 ℃, reach the purpose of heat energy recovery, on waste gas burning, also done to improve and used catalytic combustion technology, make the initiation temperature that reduces organic solvent waste gas, make in the normal use just can reach the catalytic combustion temperature of waste gas, thereby can close waste gas heating flame machine by the heat of itself behind the waste gas burning.The high-temp waste gas that former baking oven heater is produced is also by reuse, and other heating sources with thermic devices of last waste gas production line.
As preferably, described catalysis initiation temperature is 300～400 ℃.The catalysis initiation temperature can be 350 ℃.
As preferably, the air themperature that described steps d is come out when fresh air heat exchanger is lower than baking oven when temperature required, is heated by baking oven wind circulating system intermediate fuel oil heater, and can carry out temperature control to it.
As preferably, described baking oven is temperature required to be 300～400 ℃.Oven temperature generally can be 350 ℃.
As preferably, the fresh normal temperature air in the described steps d is sent into the UTILIZATION OF VESIDUAL HEAT IN heat exchanger after filtering by air cleaner.Air cleaner can foreclose airborne impurity.
As preferably, after the fresh normal temperature air in the described steps d is sent into the UTILIZATION OF VESIDUAL HEAT IN heat exchanger, temperature to 250～350 of the fresh air that heated oven replenishes ℃.
Therefore, the present invention adopts catalyst that the pernicious gas that contains organic solvent is handled when having waste gas heat and reclaiming, not the characteristics that can pollute air; The present invention also has the new wind that replenishes back baking oven and heats by the waste gas after burning heat, reach the purpose of heat energy recovery, reduce the initiation temperature of organic solvent waste gas, make the characteristics such as catalytic combustion temperature that just can reach waste gas in the normal use by the heat of itself behind the waste gas burning.
Description of drawings
Accompanying drawing 1 is a kind of process flow diagram of former exhaust-gas treatment;
Accompanying drawing 2 is a kind of method flow schematic diagrames of the present invention.
The specific embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: a kind of color-coating waste gas heat recovery method of this example the steps include:
A. will pass through this machine heat exchanger from the waste gas of baking oven, feed this machine heat exchanger again through heating by the exhaust gases chamber, catalytic bed; High-temperature gas after waste gas and the catalysis carries out heat exchange, and is heated to 300～400 ℃ catalysis initiation temperature;
B. the waste gas that is heated to the catalysis initiation temperature enters catalytic bed and carries out catalytic reaction, in catalyst P
t, P
dEffect under, be harmful organic matter benzene class oxidation conversion harmless water and carbon dioxide, reach the purpose of purifying exhaust air, wherein contain organic matter benzene class in the waste gas, its main component is C
8H
10, the reaction formula is:
C. the high-temperature gas after the catalysis feeds other equipment hot water heat exchangers behind fresh air heat exchanger and the new air heat-exchange from air filtration, new wind blower fan, and the water of heat hot tank reaches best UTILIZATION OF VESIDUAL HEAT IN purpose then;
D. the high-temperature gas after catalytic reaction purifies, by fresh air heat exchanger, the new wind that replenishes according to the heat transfer temperature difference heated oven; The new wind that baking oven replenishes, from atmosphere, suck fresh normal temperature air by new wind blower fan, and filter by air cleaner, send into fresh air heat exchanger then, fresh air to 300～350 that heated oven replenishes ℃, can satisfy making baking oven reach 300～350 ℃ of required energy, this moment, the baking oven wind circulating system stopped heating, and temperature control is realized automatically by native system.
Embodiment 2: a kind of color-coating waste gas heat recovery method of this example as Fig. 2, the steps include:
A. will pass through this machine heat exchanger from the waste gas of baking oven, feed this machine heat exchanger again through heating by the exhaust gases chamber, catalytic bed; High-temperature gas after waste gas and the catalysis carries out heat exchange, and is heated to 300～400 ℃ catalysis initiation temperature; When at first the waste gas after the exhaust gas heat exchanger heat exchange does not reach 300～400 ℃ of catalysis initiation temperatures of design control, adopting light oil by combustor is that fuel heats the catalysis initiation temperature that reaches design again, reaching the after-combustion machine quits work, system relies on waste gas reaction heat to keep the thermal balance of system, reaches best idle running status;
B. the waste gas that is heated to the catalysis initiation temperature enters catalytic bed and carries out catalytic reaction, in catalyst P
t, P
dEffect under, be harmful organic matter benzene class oxidation conversion harmless water and carbon dioxide, reach the purpose of purifying exhaust air, wherein contain organic matter benzene class in the waste gas, its main component is C
8H
10, the reaction formula is:
C. the high-temperature gas after the catalysis feeds other equipment hot water heat exchangers behind fresh air heat exchanger and the new air heat-exchange from air filtration, new wind blower fan, and the water of heat hot tank reaches best UTILIZATION OF VESIDUAL HEAT IN purpose then;
D. the high-temperature gas after catalytic reaction purifies at first passes through fresh air heat exchanger, the new wind additional according to the heat transfer temperature difference heated oven; The new wind that baking oven replenishes sucks fresh normal temperature air by new wind blower fan from atmosphere, and filters by air cleaner, sends into fresh air heat exchanger then, additional fresh air to 250～300 of heated oven ℃; When the fresh air of heating can not satisfy the heat that makes baking oven reach the needs temperature, heat with temperature by the baking oven wind circulating system and to control, promptly the waste gas of combustion chamber by fuel heater discharging heats new wind, make baking oven reach 300～400 ℃ temperature required;
Embodiment 3: a kind of color-coating waste gas heat recovery method of this example as Fig. 2, the steps include:
A. will pass through this machine heat exchanger from the waste gas of baking oven, feed this machine heat exchanger again through heating by the exhaust gases chamber, catalytic bed; High-temperature gas after waste gas and the catalysis carries out heat exchange, and is heated to 300～400 ℃ catalysis initiation temperature;
B. the waste gas that is heated to the catalysis initiation temperature enters catalytic bed and carries out catalytic reaction, in catalyst P
t, P
dEffect under, be harmful organic matter benzene class oxidation conversion harmless water and carbon dioxide, reach the purpose of purifying exhaust air, wherein contain organic matter benzene class in the waste gas, its main component is C
8H
10, the reaction formula is:
C. the high-temperature gas after the catalysis feeds other equipment hot water heat exchangers behind fresh air heat exchanger and the new air heat-exchange from air filtration, new wind blower fan, and the water of heat hot tank reaches best UTILIZATION OF VESIDUAL HEAT IN purpose then;
D. the high-temperature gas after catalytic reaction purifies at first passes through fresh air heat exchanger, the new wind additional according to the heat transfer temperature difference heated oven; The new wind that baking oven replenishes sucks fresh normal temperature air by new wind blower fan from atmosphere, and filters by air cleaner, sends into fresh air heat exchanger then, additional fresh air to 250～300 of heated oven ℃; When the fresh air of heating can not satisfy the heat that makes baking oven reach the needs temperature, heat with temperature by the baking oven wind circulating system and to control, promptly the waste gas of combustion chamber by fuel heater discharging heats new wind, make baking oven reach 300～400 ℃ temperature required.
Claims (5)
1. color-coating waste gas heat recovery method is characterized in that:
A, will feed this machine heat exchanger again through heating by the exhaust gases chamber, catalytic bed from the waste gas of baking oven by this machine heat exchanger; High-temperature gas after waste gas and the catalysis carries out heat exchange, and is heated to the catalysis initiation temperature; When heat exchange starts and when the EGT that this machine heat exchanger comes out is lower than the catalysis initiation temperature, at preheating chamber waste gas is heated to the catalysis initiation temperature by combustor;
B. the waste gas that is heated to the catalysis initiation temperature enters catalytic bed and carries out catalytic reaction, adds catalyst P
tOr/and P
d, be converted into moisture off-gas oxidizing and high-temperature gas carbon dioxide;
C. the high-temperature gas after the catalysis feeds other equipment hot water heat exchangers through fresh air heat exchanger and after passing through the air heat exchange of air cleaner, new wind blower fan successively;
D. the air by air cleaner, new wind blower fan is heated by fresh air heat exchanger successively, sends into the baking oven wind circulating system.
2. a kind of color-coating waste gas heat recovery method according to claim 1 is characterized in that described catalysis initiation temperature is 300～400 ℃.
3. a kind of color-coating waste gas heat recovery method according to claim 1 is characterized in that air themperature that described steps d is come out when fresh air heat exchanger is lower than baking oven when temperature required, is heated by baking oven wind circulating system intermediate fuel oil heater.
4. a kind of color-coating waste gas heat recovery method according to claim 3, it is characterized in that described baking oven temperature required be 300～400 ℃.
5. a kind of color-coating waste gas heat recovery method according to claim 1, it is characterized in that air in the described steps d is sent into fresh air heat exchanger after, add temperature to 250～350 ℃ of hot-air.
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| CNB2007100702521A CN100540119C (en) | 2007-07-27 | 2007-07-27 | A kind of color-coating waste gas heat recovery method |
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| CNB2007100702521A CN100540119C (en) | 2007-07-27 | 2007-07-27 | A kind of color-coating waste gas heat recovery method |
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| CN100540119C true CN100540119C (en) | 2009-09-16 |
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