*'''Conveyor''' or '''Continuous Ovens''' – Typically part of an automated conveyor processing line, conveyor ovens allow for higher volume processing.
*'''Conveyor''' or '''Continuous Ovens''' – Typically part of an automated conveyor processing line, conveyor ovens allow for higher volume processing.
*'''Clean room ovens''' – Designed for applications requiring a [[cleanroom]], such as a [[semiconductor manufacturing]] or [[biotechnology]] processes.
*'''Clean room ovens''' – Designed for applications requiring a [[cleanroom]], such as a [[semiconductor manufacturing]] or [[biotechnology]] processes.
''Some Information about the Oven Zones as like Heat Up Zone, Hold Zone, Cooling Zone, Hot Box, etc.''
*'''Heat Up Zone'''
The oven tunnel is divided into various subsections, the oven zones. The heat-up zone described here, is such a oven zone.
It is a convection zone. The car body or the dried material is convectively heated in the oven's convection zone by hot air (recirculation air) directly streaming along the car body.
The air flows from the side recirculation air pressure ducts and is blown through air filters onto the car body by nozzles.
Each of the oven's convection zones has its own recirculation air heater unit (convection hot box) with which the temperature in the respective zone is controlled. In the oven's convection zone the energy for heating the car body is transferred by hot air flowing directly pass the car body. To this end the air is heated in the heat exchanger of the recirculation air heater unit and is then fed via feed ducts in the oven. This air distribution ducts are designed as a longitudinal pressure ducts on each side of the oven zone.
From the air distribution plenum, air flows via compact high-temperature filters into the filter boxes arranged the length of the plenum and is then blown through duct wall-mounted nozzles onto the car body inside the oven.
The air is sucked back into the heat exchanger of the recirculation air heater unit through intake openings on both sides of the floor. The air is moved in a cycle from the recirculation air heater unit to the oven, from the oven back to the recirculation air heater unit and back to the oven, etc. For this reason the air is called recirculation air.
*'''Hold Zone'''
The oven tunnel is divided into various subsections, the oven zones. The hold zone described here, is such a oven zone. In this zone temperatures on the body contour are made uniform.
It is a convection zone. The car body or the dried material is convectively heated in the oven's convection zone by hot air (recirculation air) directly streaming along the car body or the dried material.
Each of the oven's convection zones has its own recirculation air heater unit (convection hot box) with which the temperature in the respective zone is controlled. In the oven's convection zone the energy for heating the car body is transferred by hot air flowing directly pass the car body. To this end the air is heated in the heat exchanger of the recirculation air heater unit and is then fed via one feed duct in the oven. This air distribution duct is designed as a longitudinal pressure duct on one side of the oven zone.
The air is sucked back into the heat exchanger of the recirculation air heater unit through intake openings on one side of the floor. The air is moved in a cycle from the recirculation air heater unit to the oven, from the oven back to the recirculation air heater unit and back to the oven, etc. For this reason the air is called recirculation air.
*'''Cooling Zone'''
The cooling zone is provided to cool down the car bodies coming out of the oven, so that work on the bodies can be continued immediately. Another reason for cooling down the bodies is to prevent them from radiating heat to the surroundings.
It is a convection zone. The car body is convectively cooled in the cooler convection zone by air directly streaming along the car body or the material.
The convection cooling zone has its dedicated cooling unit (cool box). This unit is located separate beneath the cooler tunnel and controls the temperature in the cooling zone. To this end the air is fed via feed ducts in the cooling zone. This air ducts are designed as longitudinal pressure ducts on each side of the cooling zone.
Air flows through this air distribution duct and is then blow through the nozzles attached to the duct wall onto the car body in the working space.
The air is sucked back into the cooling zone unit through intake openings on both sides of the floor.
*'''Hot Box'''
The Hot Box is a recirculation air heater unit (convection box).
The task of the Hot Box convection box is to supply a subsection of the oven tunnel with heated process air (recirculation air). This subsection is called the oven zone. It is a convection zone.
The car body or the dried material is heated in the oven's convection zone by hot air (recirculation air) directly streaming along the car body or the dried material.
The recirculation air fan (item No. V11) of the convection box sucks the recirculation air out of the oven tunnel via the recirculation air inlet connections of the convection box, then draws it through the heat exchanger first and then into the intake opening of the fan. On the discharge side the fan then blows the recirculation air through the recirculation air outlet connections via feed ducts and back into the oven tunnel.
There the air is blown onto the dried material. The air is then sucked back to the heat exchanger of the convection box. The air circulates in a cycle from the convection box to the oven tunnel, from the oven tunnel back to the convection box and back to the oven tunnel, etc. For this reason the process air is called recirculation air.
The heating medium for the heat exchanger is hot pure gas from the thermal waste air treatment plant.
The amount of energy added is controlled via the double motor damper in the pure gas pipe. If necessary the damper opens in the direction of the heat exchanger (bypass closes) and the quantity of pure gas heating medium flowing into the heat exchanger increases and gives off its energy. This energy heats the recirculation air flowing through the heat exchanger. The recirculation air temperature downstream of the heat exchanger is recorded by the temperature sensor. The double damper is controlled depending on the ACTUAL temperature of the recirculation air and the SET POINT (planned value) set at the controller.
If the ACTUAL temperature is above the SET POINT the double damper opens the bypass in the heat exchanger for pure gas flow. The energy input and therefore the recirculation air temperature reduces.
If the ACTUAL temperature is below the SET POINT the double damper opens the path for pure gas into the heat exchanger. The energy input and therefore the recirculation air temperature rises.
*''' Fresh Air Unit'''
The air volume extracted by the Air Extraction System from the oven tunnel must be replaced by a corresponding volume of fresh air which is mainly supplied by way of the air seals The task of the fresh air box is to supply these air seals of the oven tunnel with heated process fresh air. The heated-up fresh air is ducted through fresh air ducts in the oven tunnel to the air seals.
The fresh air fan of the fresh air hot box sucks the fresh air from the paint shop hall resp. air from the EC plant via the air inlet connection into the intake opening of the fan. On the discharge side the fan blows the fresh air through the filters first, then through the heat exchanger and then through the outlet connection into the fresh air duct system.
The heating medium for the heat exchanger is hot pure gas from the thermal waste air treatment plant.
The amount of energy added is controlled via the double motor damper in the pure gas pipe. If necessary the damper opens in the direction of the heat exchanger (bypass closes) and the quantity of pure gas heating medium flowing into the heat exchanger increases and gives off its energy. This energy heats the fresh air flowing through the heat exchanger. The fresh air temperature downstream of the heat exchanger is recorded by the temperature sensor. The double damper is controlled depending on the ACTUAL temperature of the fresh air and the SET POINT (planned value) set at the controller.
If the ACTUAL temperature is above the SET POINT the double damper opens the bypass in the heat exchanger for pure gas flow. The energy input and therefore the fresh air temperature reduces.
If the ACTUAL temperature is below the SET POINT the double damper opens the path for pure gas into the heat exchanger. The energy input and therefore the fresh air temperature rises.
*'''TAR'''
During the drying and curing process of the paint the oven air is loaded with evaporated solvents and crack products. In order to keep their concentration below the allowed limit a partial stream of the oven air is withdrawn by an exhaust air fan, in order to remove the pollutants in the exhaust air purification system. The hot purified air (clean gas) flowing out of the TAR incinerator is used for heating the oven; when it finally is discharged above roof to the atmosphere, it contains only a minor quantity of residual energy.
In the exhaust air purification system (often called as incinerator in industrial term) the pollutants contained in the exhaust air are removed by incineration. The purification is operated with natural gas as additional fuel. The combustion chamber temperature is maintained within permissible tolerance limits via an automatic control facility, by regulating the fuel supply to the gas burner. The combustion takes place at temperatures between 650 and 850° C. The incinerator can therefore only be applied for exhaust air purification if the pollutants are combustible.
In the exhaust air heat exchanger, the exhaust air to be purified is heated up by the hot purified gases flowing out from the combustion chamber of the incinerator. The pre-heated exhaust gases flow via the burner into the subsequent combustion chamber of the exhaust air purification system, where they are heated up to reaction temperature by the burner flame, so that most of the pollutants contained in the exhaust air are oxidized to CO2 and H2O.
The burner flame can be monitored through a sight glass.
Industrial convection oven used in the manufacture of aircraft components. Heating is by gas-fired heat exchanger; fully automated control system holds air temperature within 2°F.Industrial "Zanolli" double hearth deck oven (left) and "Sveba-Dahlen" rotary rack oven (right) at the Faculty of Food Technology, Latvia University of Agriculture bakery
Industrial ovens are heated chambers used for a variety of industrial applications, including drying, curing, or baking components, parts or final products. Industrial ovens can be used for large or small volume applications, in batches or continuously with a conveyor line, and a variety of temperature ranges, sizes and configurations.
Such ovens are used in many different applications, including chemical processing, food production, and even in the electronics industry, where circuit boards are run through a conveyor oven to attach surface mount components.
Some common types of industrial ovens include:
Curing ovens – Designed to cause a chemical reaction in a substance once a specific temperature is reached. Powder coating is one common curing oven use.
Drying ovens – Designed to remove moisture. Typical applications are pre-treating and painting. Such ovens are also sometimes known as kilns, though they do not reach the same high temperatures as are used in ceramic kilns.
Baking ovens – Combines the function of curing and drying ovens.
Reflow Ovens – A reflow oven is a machine used primarily for reflow soldering of surface mount electronic components to printed circuit boards (PCB). A graphical example of a convection reflow oven. The oven contains multiple zones, which can be individually controlled for temperature. Generally there are several heating zones followed by one or more cooling zones. The PCB moves through the oven on a conveyor belt, and is therefore subjected to a controlled time-temperature profile. Convection Reflow Oven Detailed Description
Batch ovens – Also called cabinet or Walk-in/Truck-in ovens, batch ovens allow for curing, drying or baking in small batches using wheeled racks, carts or trucks. Ovens such as this are often found in large-volume bakeries in places such as supermarkets.
Conveyor or Continuous Ovens – Typically part of an automated conveyor processing line, conveyor ovens allow for higher volume processing.
Some Information about the Oven Zones as like Heat Up Zone, Hold Zone, Cooling Zone, Hot Box, etc.
Heat Up Zone
The oven tunnel is divided into various subsections, the oven zones. The heat-up zone described here, is such a oven zone.
It is a convection zone. The car body or the dried material is convectively heated in the oven's convection zone by hot air (recirculation air) directly streaming along the car body.
The air flows from the side recirculation air pressure ducts and is blown through air filters onto the car body by nozzles.
Each of the oven's convection zones has its own recirculation air heater unit (convection hot box) with which the temperature in the respective zone is controlled. In the oven's convection zone the energy for heating the car body is transferred by hot air flowing directly pass the car body. To this end the air is heated in the heat exchanger of the recirculation air heater unit and is then fed via feed ducts in the oven. This air distribution ducts are designed as a longitudinal pressure ducts on each side of the oven zone.
From the air distribution plenum, air flows via compact high-temperature filters into the filter boxes arranged the length of the plenum and is then blown through duct wall-mounted nozzles onto the car body inside the oven.
The air is sucked back into the heat exchanger of the recirculation air heater unit through intake openings on both sides of the floor. The air is moved in a cycle from the recirculation air heater unit to the oven, from the oven back to the recirculation air heater unit and back to the oven, etc. For this reason the air is called recirculation air.
Hold Zone
The oven tunnel is divided into various subsections, the oven zones. The hold zone described here, is such a oven zone. In this zone temperatures on the body contour are made uniform.
It is a convection zone. The car body or the dried material is convectively heated in the oven's convection zone by hot air (recirculation air) directly streaming along the car body or the dried material.
Each of the oven's convection zones has its own recirculation air heater unit (convection hot box) with which the temperature in the respective zone is controlled. In the oven's convection zone the energy for heating the car body is transferred by hot air flowing directly pass the car body. To this end the air is heated in the heat exchanger of the recirculation air heater unit and is then fed via one feed duct in the oven. This air distribution duct is designed as a longitudinal pressure duct on one side of the oven zone.
The air is sucked back into the heat exchanger of the recirculation air heater unit through intake openings on one side of the floor. The air is moved in a cycle from the recirculation air heater unit to the oven, from the oven back to the recirculation air heater unit and back to the oven, etc. For this reason the air is called recirculation air.
Cooling Zone
The cooling zone is provided to cool down the car bodies coming out of the oven, so that work on the bodies can be continued immediately. Another reason for cooling down the bodies is to prevent them from radiating heat to the surroundings.
It is a convection zone. The car body is convectively cooled in the cooler convection zone by air directly streaming along the car body or the material.
The convection cooling zone has its dedicated cooling unit (cool box). This unit is located separate beneath the cooler tunnel and controls the temperature in the cooling zone. To this end the air is fed via feed ducts in the cooling zone. This air ducts are designed as longitudinal pressure ducts on each side of the cooling zone.
Air flows through this air distribution duct and is then blow through the nozzles attached to the duct wall onto the car body in the working space.
The air is sucked back into the cooling zone unit through intake openings on both sides of the floor.
Hot Box
The Hot Box is a recirculation air heater unit (convection box).
The task of the Hot Box convection box is to supply a subsection of the oven tunnel with heated process air (recirculation air). This subsection is called the oven zone. It is a convection zone.
The car body or the dried material is heated in the oven's convection zone by hot air (recirculation air) directly streaming along the car body or the dried material.
The recirculation air fan (item No. V11) of the convection box sucks the recirculation air out of the oven tunnel via the recirculation air inlet connections of the convection box, then draws it through the heat exchanger first and then into the intake opening of the fan. On the discharge side the fan then blows the recirculation air through the recirculation air outlet connections via feed ducts and back into the oven tunnel.
There the air is blown onto the dried material. The air is then sucked back to the heat exchanger of the convection box. The air circulates in a cycle from the convection box to the oven tunnel, from the oven tunnel back to the convection box and back to the oven tunnel, etc. For this reason the process air is called recirculation air.
The heating medium for the heat exchanger is hot pure gas from the thermal waste air treatment plant.
The amount of energy added is controlled via the double motor damper in the pure gas pipe. If necessary the damper opens in the direction of the heat exchanger (bypass closes) and the quantity of pure gas heating medium flowing into the heat exchanger increases and gives off its energy. This energy heats the recirculation air flowing through the heat exchanger. The recirculation air temperature downstream of the heat exchanger is recorded by the temperature sensor. The double damper is controlled depending on the ACTUAL temperature of the recirculation air and the SET POINT (planned value) set at the controller.
If the ACTUAL temperature is above the SET POINT the double damper opens the bypass in the heat exchanger for pure gas flow. The energy input and therefore the recirculation air temperature reduces.
If the ACTUAL temperature is below the SET POINT the double damper opens the path for pure gas into the heat exchanger. The energy input and therefore the recirculation air temperature rises.
Fresh Air Unit
The air volume extracted by the Air Extraction System from the oven tunnel must be replaced by a corresponding volume of fresh air which is mainly supplied by way of the air seals The task of the fresh air box is to supply these air seals of the oven tunnel with heated process fresh air. The heated-up fresh air is ducted through fresh air ducts in the oven tunnel to the air seals.
The fresh air fan of the fresh air hot box sucks the fresh air from the paint shop hall resp. air from the EC plant via the air inlet connection into the intake opening of the fan. On the discharge side the fan blows the fresh air through the filters first, then through the heat exchanger and then through the outlet connection into the fresh air duct system.
The heating medium for the heat exchanger is hot pure gas from the thermal waste air treatment plant.
The amount of energy added is controlled via the double motor damper in the pure gas pipe. If necessary the damper opens in the direction of the heat exchanger (bypass closes) and the quantity of pure gas heating medium flowing into the heat exchanger increases and gives off its energy. This energy heats the fresh air flowing through the heat exchanger. The fresh air temperature downstream of the heat exchanger is recorded by the temperature sensor. The double damper is controlled depending on the ACTUAL temperature of the fresh air and the SET POINT (planned value) set at the controller.
If the ACTUAL temperature is above the SET POINT the double damper opens the bypass in the heat exchanger for pure gas flow. The energy input and therefore the fresh air temperature reduces.
If the ACTUAL temperature is below the SET POINT the double damper opens the path for pure gas into the heat exchanger. The energy input and therefore the fresh air temperature rises.
TAR
During the drying and curing process of the paint the oven air is loaded with evaporated solvents and crack products. In order to keep their concentration below the allowed limit a partial stream of the oven air is withdrawn by an exhaust air fan, in order to remove the pollutants in the exhaust air purification system. The hot purified air (clean gas) flowing out of the TAR incinerator is used for heating the oven; when it finally is discharged above roof to the atmosphere, it contains only a minor quantity of residual energy.
In the exhaust air purification system (often called as incinerator in industrial term) the pollutants contained in the exhaust air are removed by incineration. The purification is operated with natural gas as additional fuel. The combustion chamber temperature is maintained within permissible tolerance limits via an automatic control facility, by regulating the fuel supply to the gas burner. The combustion takes place at temperatures between 650 and 850° C. The incinerator can therefore only be applied for exhaust air purification if the pollutants are combustible.
In the exhaust air heat exchanger, the exhaust air to be purified is heated up by the hot purified gases flowing out from the combustion chamber of the incinerator. The pre-heated exhaust gases flow via the burner into the subsequent combustion chamber of the exhaust air purification system, where they are heated up to reaction temperature by the burner flame, so that most of the pollutants contained in the exhaust air are oxidized to CO2 and H2O.
The burner flame can be monitored through a sight glass.
