CN114264127A - Method and device for monitoring heat recovery efficiency of oven - Google Patents
Method and device for monitoring heat recovery efficiency of oven Download PDFInfo
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- CN114264127A CN114264127A CN202010975971.3A CN202010975971A CN114264127A CN 114264127 A CN114264127 A CN 114264127A CN 202010975971 A CN202010975971 A CN 202010975971A CN 114264127 A CN114264127 A CN 114264127A
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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
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- 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
Abstract
The invention provides a monitoring method of heat recovery efficiency of an oven, which comprises the steps of performing heat recovery on high-temperature waste gas discharged by the oven by using an energy saver, detecting the temperature of the high-temperature waste gas in the oven before the high-temperature waste gas is introduced into the energy saver to obtain the temperature in the oven, detecting the temperature of normal-temperature air before the normal-temperature air is introduced into the oven by the energy saver to obtain an inlet air temperature, detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the energy saver to obtain an environment temperature, and calculating the heat recovery efficiency. The invention also comprises a monitoring device for implementing the method, so as to solve the problem that a user cannot know the energy-saving effect of the oven after the energy-saving device is configured.
Description
Technical Field
The present invention relates to a temperature monitoring technology of an oven, and more particularly, to a method and an apparatus for monitoring heat recovery efficiency of an oven.
Background
The oven aimed by the invention is an industrial oven, which is widely applied to the baking operation of the existing photoelectric products such as PCB, LCD or Touch screen (Touch Panel) and the like at present, and can perform the operations such as drying processing or aging test on the photoelectric products; the interior of a conventional industrial oven generally has a heating cavity, and a heater (e.g. an electrothermal tube) disposed at an end side of the heating cavity, and the heater can generate heat energy to adjust and control the interior of the heating cavity to reach a desired heating temperature, thereby baking the above-mentioned photoelectric product; meanwhile, normal temperature air with a temperature of about 10 to 40 ℃ can be introduced into the heating chamber through the air inlet of the oven, and high temperature exhaust gas with a temperature of about 150 ℃ in the heating chamber is exhausted to the outside through the air outlet of the oven, so that the gas in the heating chamber is continuously replaced, the content of volatile matters in the gas can be reduced, and the quality of the baked photoelectric product is ensured.
Generally, a temperature sensor is disposed in the heating chamber, and the temperature sensor detects the temperature in the heating chamber, and the heater adjusts and controls the interior of the heating chamber to reach a desired heating temperature. However, the heater must consume a large amount of electric power to heat the ambient air (about 10 to 40 degrees celsius) introduced into the heating chamber from the outside to the heating temperature (about 150 degrees celsius).
Therefore, the oven is provided with an energy saver (i.e. a heat exchanger) between the air outlet and the air inlet to recover the waste heat of the high temperature exhaust gas discharged from the air outlet and to heat the normal temperature air introduced into the heating chamber of the oven from the outside through the air inlet by using the waste heat. Therefore, the temperature of the high-temperature exhaust gas discharged by the oven can be reduced to reduce the environmental temperature stress, and the normal-temperature air introduced into the heating chamber of the oven from the outside can be preheated to reduce the electric energy consumption of the heater in the heating chamber of the oven.
However, although the user knows that the oven can reduce the power consumption when heating the air at normal temperature by configuring the economizer, the user cannot more specifically know the energy saving effect of the oven after configuring the economizer, and thus needs to be improved.
Disclosure of Invention
The purpose of the present invention is to improve the problem that the user cannot know the energy saving effect of the oven after the energy saver is arranged.
To achieve the above objects, in accordance with a preferred embodiment of the present invention, a method for monitoring heat recovery efficiency of an oven is provided, which includes the following steps S1 to S3: s1: an economizer is used for carrying out heat recovery on high-temperature waste gas discharged by the oven; s2: detecting the temperature of high-temperature waste gas in the oven before the high-temperature waste gas is introduced into the energy saver to obtain the temperature in the oven, detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the oven through the energy saver to obtain an air inlet temperature, and detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the energy saver to obtain an environmental temperature; and S3: the heat recovery efficiency was calculated as follows: (z-x)/(y-x), wherein y is the furnace temperature, z is the inlet air temperature, and x is the ambient temperature.
In a further embodiment, the high temperature exhaust gas in the heating chamber of the oven is exhausted to the outside through an exhaust port of the oven, the ambient temperature air is introduced into the heating chamber of the oven through an air inlet of the oven, the temperature in the oven is detected at the exhaust port, the air inlet temperature is detected at the air inlet or the heating chamber, and the ambient temperature is detected around the oven.
In further implementations, the furnace interior temperature is greater than the intake air temperature, which is greater than the ambient temperature.
Another preferred embodiment of the present invention further provides a method for monitoring heat recovery efficiency of an oven, including performing the following steps S1 to S3: s1: an economizer is used for carrying out heat recovery on high-temperature waste gas discharged by the oven; s2: detecting the temperature of high-temperature waste gas in the oven before the high-temperature waste gas is introduced into the energy saver to obtain the temperature in the oven, and detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the oven through the energy saver to obtain the air inlet temperature; and S3: the heat recovery efficiency was calculated as follows: z/y, wherein y is the temperature in the furnace, and z is the temperature of the inlet gas.
In a further implementation, the high-temperature exhaust gas in the heating chamber of the oven is exhausted to the outside through an exhaust port of the oven, the ambient air is introduced into the heating chamber of the oven through an air inlet of the oven, the temperature in the oven is detected at the exhaust port or the heating chamber, and the air inlet temperature is detected at the air inlet.
In further implementations, the furnace temperature is greater than the intake air temperature.
In order to implement the above method, according to another preferred embodiment of the present invention, there is provided a device for monitoring heat recovery efficiency of an oven, including: the heating device comprises at least one heating cavity formed inside an oven, wherein an exhaust port and an air inlet communicated with the heating cavity are formed on the surface of the oven; the energy-saving devices are arranged on the oven and are provided with a waste gas inlet and a waste gas outlet which are communicated with each other, and an air inlet and an air outlet which are communicated with each other, the waste gas inlet is connected with the exhaust port of the heating cavity, and the air outlet is connected with the air inlet of the heating cavity; the number of the in-furnace temperature sensors is equal to that of the heating chambers, and the in-furnace temperature sensors are arranged at the exhaust port of the heating chambers or in the heating chambers; the number of the inlet temperature sensors is equal to that of the heating chambers, and the inlet temperature sensors are arranged at the inlets of the heating chambers; and the monitoring unit is arranged on the oven, is electrically connected with the furnace temperature sensor and the air inlet temperature sensor and is used for detecting the temperature data of the furnace temperature and the air inlet temperature and calculating the heat recovery efficiency of the energy saver.
In a further implementation, the monitoring unit is further electrically connected to an ambient temperature sensor disposed around the oven for detecting temperature data of the ambient temperature and calculating the heat recovery efficiency of the economizer.
In a further implementation, the monitoring unit comprises an arithmetic unit and a display, the arithmetic unit calculates the heat recovery efficiency according to the temperature data, and the temperature data and the heat recovery efficiency are converted into character information which is displayed externally through the display.
According to the technical means, the invention has the technical effects that: the heat recovery efficiency is calculated by detecting the temperature in the oven, the air inlet temperature and the ambient temperature of the oven, so that a user can more specifically know the energy-saving effect generated after the energy saver is arranged in the oven.
The features and technical effects of the embodiments disclosed herein will be presented in the following description and drawings.
Drawings
FIG. 1 is a flowchart illustrating the steps of a monitoring method according to a first embodiment of the present invention.
Fig. 2 and 3 are schematic diagrams of the configurations of different embodiments of fig. 1, respectively.
FIG. 4 is a flowchart illustrating the steps of a monitoring method according to a second embodiment of the present invention.
Fig. 5 and 6 are schematic diagrams of configurations of different embodiments of fig. 4, respectively.
Fig. 7 and 8 are schematic diagrams of configurations of different embodiments of the monitoring device of the present invention.
List of reference numerals: 10-an oven; 101-an inlet end; 102-an outlet end; 11-a heating chamber; 12-a baking channel; 13-an exhaust port; 14-an air inlet; 20-an energy saver; 21-an exhaust gas inlet; 22-exhaust gas outlet; 221-an exhaust pipe; 23-an air inlet; 231-an air filter; 24-an air outlet; 31-a furnace temperature sensor; 32-an intake air temperature sensor; 33-ambient temperature sensor; 40-a monitoring unit; 41-an operator; 42-a display; S1-S3-description of the steps of the embodiment.
Detailed Description
Referring to fig. 1, a first embodiment of a method for monitoring heat recovery efficiency of an oven according to the present invention is illustrated, which includes the following steps S1 to S3:
step S1: an economizer is used to recover heat from the oven.
Referring to fig. 2, the oven 10 is illustrated as having an air inlet 14 and an air outlet 13, high-temperature exhaust gas in the heating chamber 11 of the oven 10 is exhausted to the outside through the air outlet 13, and ambient air at normal temperature is introduced into the oven 10 through the air inlet 14. The exhaust port 13 and the intake port 14 of the oven 10 are respectively connected to an economizer 20, so that the high-temperature exhaust gas in the heating cavity 11 of the oven 10 is exhausted to the outside through the economizer 20, and the outside normal-temperature air is introduced into the heating cavity 11 of the oven 10 through the economizer 20, thereby recovering the residual heat of the high-temperature exhaust gas exhausted from the exhaust port 13 by the oven 10, and heating the normal-temperature air introduced into the heating cavity 11 of the oven 10 from the outside through the intake port 14 by using the residual heat.
Step S2: the temperature in the furnace, the temperature of the inlet air and the ambient temperature are detected.
Referring to fig. 2 and 3, sensing an oven temperature at the exhaust port 13 (shown in fig. 2) or the heating chamber 11 (shown in fig. 3) of the oven 10, sensing an intake air temperature at the intake port 14 of the oven 10, sensing an ambient temperature around the oven 10, wherein the oven temperature is higher than the intake air temperature, and the intake air temperature is higher than the ambient temperature, that is, the oven temperature > the intake air temperature > the ambient temperature, will be described. In the present invention, the furnace temperature refers to a temperature of the high-temperature exhaust gas in the oven 10 after leaving the oven 10 and before entering the economizer 20, the intake temperature refers to a temperature of the ambient air after passing through the economizer 20 and before entering the oven 10, and the ambient temperature refers to a temperature of the ambient air before entering the economizer 20.
The obtained data of the furnace temperature, the intake air temperature and the ambient temperature are transmitted to a monitoring unit 40, and the monitoring unit 40 can calculate the heat recovery efficiency (i.e. the energy saving effect) of the oven 10 after the energy saver 20 is configured according to the data. Further, an oven temperature sensor 31 for detecting the oven temperature is disposed at the exhaust port 13 (as shown in fig. 2) or the heating chamber 11 (as shown in fig. 3) of the oven 10, an intake temperature sensor 32 for detecting the intake temperature is disposed at the intake port 14 of the oven 10, an environment temperature sensor 33 for detecting the environment temperature is disposed around the oven 10, and the oven temperature sensor 31, the intake temperature sensor 32 and the environment temperature sensor 33 are respectively electrically connected to the monitoring unit 40 to transmit the acquired temperature data to the monitoring unit 40.
Step S3: the heat recovery efficiency was calculated.
Setting the temperature in the furnace as y, the air inlet temperature as z, the ambient temperature as x and the heat recovery efficiency as c:
c ═ z-x)/(y-x) formula (1)
Wherein, when the value of the heat recovery efficiency c is higher, the smaller the temperature difference between the intake air temperature z and the furnace temperature y is, that is, the less electric energy is consumed by the heater when heating the air; conversely, when the value of the heat recovery efficiency c is lower, it means that the temperature difference between the intake air temperature z and the furnace temperature y is larger, that is, the heater needs to consume more electric power when heating the air.
Referring to fig. 4, a second embodiment of the method for monitoring the heat recovery efficiency of the oven according to the present invention is illustrated, which includes the following steps S1 to S3, wherein the difference between the first embodiment and the second embodiment is steps S2 and S3:
step S2: the temperature in the furnace and the temperature of the intake air are detected.
Referring to fig. 5 and fig. 6, it is described that, in the present embodiment, when calculating the heat recovery efficiency, the ambient temperature sensor 33 for detecting the ambient temperature can be selectively configured or not, because the temperature data of the ambient temperature is not used.
Step S3: the heat recovery efficiency was calculated.
Setting the temperature in the furnace as y, the air inlet temperature as z and the heat recovery efficiency as c:
c as z/y type (1)
Wherein, when the value of the heat recovery efficiency c is higher, the smaller the temperature difference between the intake air temperature z and the furnace temperature y is, that is, the less electric energy is consumed by the heater when heating the air; conversely, when the value of the heat recovery efficiency c is lower, it means that the temperature difference between the intake air temperature z and the furnace temperature y is larger, that is, the heater needs to consume more electric power when heating the air.
From the above, the difference between the two calculation methods of heat recovery efficiency provided by the present invention is: the formula (1) is that the heat recovery efficiency c is obtained by dividing the intake air temperature z minus the ambient temperature x by the furnace temperature y likewise minus the ambient temperature x; the formula (2) is that the heat recovery efficiency c is obtained by dividing the intake air temperature z by the furnace temperature y; although the two heat recovery efficiencies c are different in value due to different calculation methods, they also provide a user with clear knowledge of the energy saving effect of the oven 10 after the economizer 20 is provided.
On the other hand, referring to fig. 7, it is illustrated that the present invention further provides a device for monitoring the heat recovery efficiency of an oven, so that the method for monitoring the heat recovery efficiency of the oven can be easily implemented. The monitoring device for the heat recovery efficiency of the oven comprises an oven 10, wherein an inlet end 101 and an outlet end 102 are respectively formed at two ends of the oven 10, an object enters the oven 10 from the inlet end 101 to be baked, and then leaves the oven 10 from the outlet end 102, at least one heating cavity 11 is formed in the oven 10, the heating cavities 11 are mutually communicated to form a baking channel 12, the inlet end 101 is communicated with the outlet end 102 through the baking channel 12, so that the object can pass through the oven 10 through the baking channel 12, an exhaust port 13 and an air inlet 14 which are communicated with the heating cavity 11 are formed on the surface of the oven 10, high-temperature waste gas in the heating cavity 11 is exhausted to the outside through the exhaust port 13, and outside normal-temperature air is introduced into the heating cavity 11 through the air inlet 14.
The oven 10 is provided with energy-saving devices 20 equal to the heating chamber 11 in number, the energy-saving device 20 has a waste gas inlet 21 and a waste gas outlet 22 communicated with each other, and an air inlet 23 and an air outlet 24 communicated with each other, wherein the waste gas inlet 21 is connected to the exhaust port 13 to allow the high-temperature waste gas in the heating chamber 11 to enter the energy-saving device 20, the waste gas outlet 22 is connected to an exhaust pipe 221 to allow the high-temperature waste gas in the energy-saving device 20 to be exhausted to the outside, the air inlet 23 is connected to an air filter 231 to allow the ambient air to enter the energy-saving device 20 at normal temperature to filter out dust, impurities and the like contained in the air, and the air outlet 24 is connected to the air inlet 14 to allow the ambient air in the energy-saving device 20 to enter the heating chamber 11. The high temperature exhaust gas in the heating chamber 11 is reduced in temperature when being discharged to the outside through the economizer 20 by heat exchange between the high temperature exhaust gas and the normal temperature air in the economizer 20, and the normal temperature air in the outside is increased in temperature when being introduced into the heating chamber 11 through the economizer 20. Therefore, the damage of high-temperature waste gas to the ambient temperature can be reduced, and the electric energy consumption of the heater in the heating chamber 11 when the heater heats the normal-temperature air is reduced.
The exhaust port 13 (shown in fig. 7) of the heating chamber 11 is configured with a furnace temperature sensor 31, and the furnace temperature sensor 31 may also be configured in the heating chamber 11 (shown in fig. 8) for detecting the temperature of the high-temperature exhaust gas in the heating chamber 11 before entering the economizer 20, so as to obtain temperature data of a furnace temperature. The air inlet 14 of the heating chamber 11 is provided with an air inlet temperature sensor 32 for detecting the temperature of the ambient air after passing through the economizer 20 and before entering the heating chamber 11, so as to obtain the temperature data of the air inlet temperature. An ambient temperature sensor 33 is disposed around the oven 10 for detecting the temperature of the ambient air before entering the economizer 20, so as to obtain temperature data of an ambient temperature; in the implementation, the ambient temperature sensor 33 is necessary when the calculation method of the formula (1) is used, and the ambient temperature sensor 33 is optional when the calculation method of the formula (2) is used.
The end surface of the oven 10 is configured with a monitoring unit 40, the monitoring unit 40 is electrically connected to the oven temperature sensor 31, the intake air temperature sensor 32 and the environment temperature sensor 33, and the temperature data detected by the oven temperature sensor 31, the intake air temperature sensor 32 and the environment temperature sensor 33 is transmitted to the monitoring unit 40. The monitoring unit 40 includes an arithmetic unit 41 and a display 42, the temperature data detected by the furnace temperature sensor 31, the intake air temperature sensor 32 and the ambient temperature sensor 33 are transmitted to the arithmetic unit 41, the arithmetic unit 41 can calculate the heat recovery efficiency according to the acquired temperature data, and the temperature data and the heat recovery efficiency can be converted into a text message displayed to the outside through the display 42 for the user to view. In addition, when the heat recovery efficiency is too low, the monitoring unit 40 can issue an alarm to remind the user to check whether the temperature in the furnace and the temperature of the intake air have not reached the predetermined temperature.
In one embodiment, the information displayed by the monitoring unit 40 is as shown in table one:
watch 1
The "number of slots" represents the number of heating chambers, the "furnace temperature" represents the temperature of high-temperature exhaust gas in the oven after leaving the oven and before entering the economizer, the "ambient temperature" represents the temperature of ambient air before entering the economizer, the "furnace temperature rise" represents the temperature difference between the furnace temperature and the ambient temperature (i.e., the furnace temperature-ambient temperature), the "intake air temperature" represents the temperature of ambient air after passing through the economizer and before entering the oven, the "heat recovery temperature rise" represents the temperature difference between the intake air temperature and the ambient temperature (i.e., the heat recovery temperature rise-ambient temperature), the value of the "heat recovery efficiency 1" is obtained by the calculation method of the formula (1), and the value of the "heat recovery efficiency 2" is obtained by the calculation method of the formula (2).
The above examples are only for illustrating the preferred embodiments of the present invention, but should not be construed as limiting the scope of the present invention. Therefore, the invention is subject to the claims defined in the claims.
Claims (10)
1. A method of monitoring heat recovery efficiency of an oven, comprising performing the steps of:
s1: an economizer is used for carrying out heat recovery on high-temperature waste gas discharged by the oven;
s2: detecting the temperature of high-temperature waste gas in the oven before the high-temperature waste gas is introduced into the energy saver to obtain the temperature in the oven, detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the oven through the energy saver to obtain an air inlet temperature, and detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the energy saver to obtain an environmental temperature; and
s3: the heat recovery efficiency c was calculated as follows:
c＝(z－x)/(y－x)
wherein y is the furnace temperature, z is the inlet gas temperature, and x is the ambient temperature.
2. The method of monitoring heat recovery efficiency of an oven according to claim 1, wherein the high temperature exhaust gas in the heating chamber of the oven is exhausted to the outside through an exhaust port of the oven, the ambient temperature air is introduced into the heating chamber of the oven through an air inlet of the oven, the temperature inside the oven is sensed at the exhaust port, the temperature of the intake air is sensed at the air inlet, and the ambient temperature is sensed around the oven.
3. The method of monitoring heat recovery efficiency of an oven according to claim 1, wherein high temperature exhaust gas in the heating chamber of the oven is exhausted to the outside through an exhaust port of the oven, ambient air of the outside is introduced into the heating chamber of the oven through an air inlet port of the oven, the temperature inside the oven is sensed at the heating chamber, the temperature of the intake air is sensed at the air inlet port, and the ambient temperature is sensed at the periphery of the oven.
4. A method of monitoring heat recovery efficiency of an oven according to claim 1, 2 or 3, wherein said oven temperature is higher than said inlet air temperature, said inlet air temperature being higher than said ambient temperature.
5. A method of monitoring heat recovery efficiency of an oven, comprising performing the steps of:
s1: an economizer is used for carrying out heat recovery on high-temperature waste gas discharged by the oven;
s2: detecting the temperature of high-temperature waste gas in the oven before the high-temperature waste gas is introduced into the energy saver to obtain the temperature in the oven, and detecting the temperature of the normal-temperature air before the normal-temperature air is introduced into the oven through the energy saver to obtain the air inlet temperature; and
s3: the heat recovery efficiency c was calculated as follows:
c＝z/y
wherein y is the furnace temperature and z is the inlet gas temperature.
6. The method of monitoring heat recovery efficiency of an oven according to claim 5, wherein the high temperature exhaust gas in the heating chamber of the oven is exhausted to the outside through an exhaust port of the oven, and the ambient temperature air is introduced into the heating chamber of the oven through an air inlet of the oven, wherein the temperature inside the oven is detected at the exhaust port, and the temperature of the inlet air is detected at the air inlet.
7. The method of monitoring heat recovery efficiency of an oven according to claim 5, wherein the high temperature exhaust gas in the heating chamber of the oven is exhausted to the outside through an exhaust port of the oven, and the ambient temperature air is introduced into the heating chamber of the oven through an air inlet port of the oven, wherein the temperature inside the oven is sensed at the heating chamber, and the temperature of the inlet air is sensed at the air inlet port.
8. A method of monitoring the heat recovery efficiency of an oven as claimed in claim 5, 6 or 7 wherein the temperature in the oven is higher than the inlet air temperature.
9. A device for monitoring heat recovery efficiency of an oven, comprising:
the heating device comprises at least one heating cavity formed inside an oven, wherein an exhaust port and an air inlet communicated with the heating cavity are formed on the surface of the oven;
the energy-saving devices are arranged on the oven and are provided with a waste gas inlet and a waste gas outlet which are communicated with each other, and an air inlet and an air outlet which are communicated with each other, the waste gas inlet is connected with the exhaust port of the heating cavity, and the air outlet is connected with the air inlet of the heating cavity;
the number of the in-furnace temperature sensors is equal to that of the heating chambers, and the in-furnace temperature sensors are arranged at the exhaust port of the heating chambers or in the heating chambers;
the number of the inlet temperature sensors is equal to that of the heating chambers, and the inlet temperature sensors are arranged at the inlets of the heating chambers; and
and the monitoring unit is electrically connected with the furnace temperature sensor and the air inlet temperature sensor and is used for detecting the temperature data of the furnace temperature and the air inlet temperature and calculating the heat recovery efficiency of the energy saver.
10. The apparatus for monitoring heat recovery efficiency of an oven according to claim 9, wherein the monitoring unit is further electrically connected to an ambient temperature sensor disposed around the oven for detecting temperature data of ambient temperature and calculating the heat recovery efficiency of the economizer.
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