CN216409904U - Air preheater control system - Google Patents
Air preheater control system Download PDFInfo
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- CN216409904U CN216409904U CN202122872997.8U CN202122872997U CN216409904U CN 216409904 U CN216409904 U CN 216409904U CN 202122872997 U CN202122872997 U CN 202122872997U CN 216409904 U CN216409904 U CN 216409904U
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- air preheater
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- frequency converter
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The application provides an air heater control system relates to the electronic equipment field, has solved and has had the low problem that influences the air heater safety and stability operation of converter operating stability among the correlation technique. The air preheater control system includes: the system comprises a frequency converter, a first contactor, a second contactor, an air preheater and a dispersion controller; the air preheater comprises a motor; the frequency converter is provided with a first end and a second end, the first end of the frequency converter is connected with the motor of the air preheater through the first contactor, and the second end of the frequency converter is connected with the motor of the air preheater through the second contactor; the distributed controller is respectively connected with the frequency converter, the first contactor and the second contactor.
Description
Technical Field
The utility model relates to the field of electronic equipment, in particular to an air preheater control system.
Background
In a thermal power plant, each boiler in a thermal power unit is generally provided with an air preheater, and the air preheater can improve the heat exchange performance of the boiler.
In the related art, the air preheater generally adopts a frequency conversion control mode, and the specific principle is that the frequency conversion operation of the air preheater is controlled by a frequency converter.
However, the related art has the problem that the operation stability of the frequency converter is low, which affects the safe and stable operation of the air preheater. For example, in the process of frequency conversion operation of the air preheater, because the frequency converter participates in the control operation of the air preheater for a long time, the frequency converter has high failure rate and is easy to age and damage, and the safe and stable operation of the air preheater is influenced. For another example, the power system is prone to cause instantaneous voltage drop due to accidents, and low voltage passes through the power plant service system of the power plant, so that the low voltage blocking protection action of the frequency converter is prone to be triggered, the air preheater is prone to trip, and safe and stable operation of the air preheater is affected.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that there is the converter operating stability low and influence air heater safety and stability operation among the correlation technique, the application provides an air heater control system, can guarantee air heater safety and stability operation.
The embodiment of the application provides an air heater control system, includes: the system comprises a frequency converter, a first contactor, a second contactor, an air preheater and a dispersion controller;
the air preheater comprises a motor; the frequency converter is provided with a first end and a second end, the first end of the frequency converter is connected with the motor of the air preheater through the first contactor, and the second end of the frequency converter is connected with the motor of the air preheater through the second contactor;
the distributed controller is respectively connected with the frequency converter, the first contactor and the second contactor.
Optionally, in an embodiment of the present application, the air preheater further includes a driving mechanism and a rotor mechanism, and the motor is connected to the rotor mechanism through the driving mechanism;
the air preheater control system further comprises: a speed sensor; the setting position of the speed sensor is correlated with the setting position of the rotor mechanism; the speed sensor is connected with the decentralized controller.
Optionally, in an embodiment of the present application, the number of the driving mechanisms is two, the driving mechanisms include a first driving mechanism and a second driving mechanism, and the first driving mechanism and the second driving mechanism are connected in parallel;
the motor is connected with the rotor mechanism through the first driving mechanism, and the motor is connected with the rotor mechanism through the second driving mechanism.
Optionally, in an embodiment of the present application, the first contactor includes a first contact, and the second contactor includes a second contact; the first end of the frequency converter is connected with the motor of the air preheater through the first contact, and the second end of the frequency converter is connected with the motor of the air preheater through the second contact;
the first contactor and the second contactor interlock; the states of the first contact and the second contact are opposite; in the first contact closed state, the second contact is in an open state; in the first contact open state, the second contact is in a closed state.
Optionally, in an embodiment of the present application, the interlocking of the first contactor and the second contactor includes: the first contactor and the second contactor are mechanically interlocked;
the set position of the first contactor and the set position of the second contactor are associated with each other in a case where the first contactor and the second contactor are mechanically interlocked.
Optionally, in an embodiment of the present application, the interlocking of the first contactor and the second contactor includes: the first contactor and the second contactor are electrically interlocked;
under the condition that the first contactor and the second contactor are electrically interlocked, the first contactor further comprises a first normally closed contact, and the second contactor further comprises a second normally closed contact; the first normally closed contact is connected with the second contact, and the second normally closed contact is connected with the first contact.
Optionally, in an embodiment of the present application, the first contactor further includes a first control coil, the first control coil is separated from the first contact, and the first control coil is configured to control a state of the first contact;
the second contactor further comprises a second control coil, the second control coil is separated from the second contact, and the second control coil is used for controlling the state of the second contact;
the air preheater control system further comprises an uninterruptible power supply, and the uninterruptible power supply is respectively connected with the first control coil, the second control coil and the distributed controller.
Optionally, in this embodiment of the present application, the number of the uninterruptible power supplies is two, the uninterruptible power supplies include a first uninterruptible power supply and a second uninterruptible power supply, and the first uninterruptible power supply and the second uninterruptible power supply are connected in parallel.
Optionally, in this embodiment of the present application, the air preheater control system further includes an air switch, and the air switch is connected to the second end of the frequency converter.
Optionally, in this embodiment of the present application, the air preheater control system further includes a control cabinet, and the frequency converter, the first contactor, and the second contactor are all disposed in the control cabinet.
According to the present invention, there is provided an air preheater control system comprising: the system comprises a frequency converter, a first contactor, a second contactor, an air preheater and a dispersion controller; the air preheater comprises a motor; the frequency converter is provided with a first end and a second end, the first end of the frequency converter is connected with the motor of the air preheater through the first contactor, and the second end of the frequency converter is connected with the motor of the air preheater through the second contactor; the distributed controller is respectively connected with the frequency converter, the first contactor and the second contactor. Therefore, the first contactor is in a conducting state, the frequency converter is in a running state, and a motor of the air preheater is in a frequency conversion running state; and the second contactor is in a conducting state, the frequency converter is in a shutdown state, and a motor of the air preheater is in a power frequency running state. Therefore, under the condition that the first contactor is controlled to be not conducted and the second contactor is controlled to be conducted through the decentralized controller, the frequency converter can be bypassed, the frequency converter stops working, the frequency converter can be cut off from a control loop of the air preheater, the frequency converter can be prevented from participating in the control operation of the air preheater for a long time, the frequency converter can be prevented from tripping the air preheater due to low-voltage ride through, and therefore the safe and stable operation of the air preheater is guaranteed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the embodiments of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic block diagram of an air preheater control system according to an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic block diagram of another air preheater control system according to an embodiment of the present application;
FIG. 3 is a schematic block diagram of another air preheater control system according to an embodiment of the present application;
description of reference numerals:
100-air preheater control system; 101-a frequency converter; 102-a first contactor; 1021-a first contact; 103-a second contactor; 1031-second contact; 104-an air preheater; 1041-an electric machine; 1042 — a drive mechanism; 1043-a rotor mechanism; 105-a decentralized controller; 106-a speed sensor; 107-air switch; AC-alternating current.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below with reference to specific embodiments of the present application and accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The technical scheme provided by the utility model is described in detail below with reference to the accompanying drawings 1-3.
FIG. 1 is a schematic structural diagram of an air preheater control system according to an embodiment of the present disclosure.
As shown in fig. 1, an air preheater control system 100 provided by an embodiment of the present application may include:
a frequency converter 101, a first contactor 102, a second contactor 103, an air preheater 104 and a dispersion controller 105; the air preheater 104 includes a motor 1041;
the frequency converter 101 is provided with a first end and a second end, the first end of the frequency converter 101 is connected with the motor 1041 of the air preheater through the first contactor 102, and the second end of the frequency converter 101 is connected with the motor 1041 of the air preheater through the second contactor 103;
the distributed controller 105 is connected to the frequency converter 101, the first contactor 102, and the second contactor 103, respectively.
The first contactor is in a conducting state, the frequency converter is in a running state, and a motor of the air preheater is in a frequency conversion running state; the second contactor is in a conducting state, the frequency converter is in a shutdown state, and a motor of the air preheater is in a power frequency running state.
In the embodiment of the present application, as shown in fig. 1, AC represents alternating current, and the operating environment of the air preheater is alternating current.
In the embodiment of the application, the first contactor and the second contactor are both contactors, and the contactors are used for controlling and conducting a loop where contacts of the contactors are located. The contactor includes a contact and a control coil provided separately from the contact, and the closed state of the contact is controlled by energizing the control coil. The contactor has high safety because the contact and the control coil are in different control loops. The specific type and model of the contactor is not specifically limited in this application.
In the embodiment of the application, under the condition that the frequency converter is started and operated, if the first contactor is in a conducting state, the motor of the air preheater is in a frequency conversion operation state.
In this application embodiment, when the frequency converter stopped operating, if the second contactor was in the conducting state, air heater's motor was in power frequency running state.
In the embodiment of the present application, the distributed controller may be configured to control whether the frequency converter 101 operates; and also for controlling whether the first contactor 102 and the second contactor 103 are conductive.
In the embodiment of the present application, the distributed controller may be a computer, a server, or the like in the DCS workstation, and has an arithmetic processing function. In practice, the decentralized controller may be installed remotely from the rest of the air preheater control system. The specific type and model of decentralized controller is not specifically limited by this application.
In this application embodiment, compare with the air heater in the frequency conversion running state for a long time among the correlation technique, air heater can be after starting with the frequency conversion mode, switch into power frequency running mode long-term operation. That is to say, the initial operation stage of the air preheater can control the frequency converter to start and operate through the decentralized controller, and control the first contactor to be conducted; at this time, the air preheater is in a variable frequency starting state. After a period of time, the frequency converter can be controlled to stop through the decentralized controller, and the second contactor is controlled to be conducted, so that the air preheater can be switched to a power frequency running state.
It can be understood that when the motor of the air preheater is in a power frequency operation state, the frequency converter stops working, so that the frequency converter can be prevented from participating in the control operation of the air preheater for a long time, the frequency converter can be prevented from tripping the air preheater due to low-voltage ride through, and the safe and stable operation of the air preheater can be further ensured.
The application provides an air heater control system includes: the system comprises a frequency converter, a first contactor, a second contactor, an air preheater and a dispersion controller; the air preheater comprises a motor; the frequency converter is provided with a first end and a second end, the first end of the frequency converter is connected with the motor of the air preheater through the first contactor, and the second end of the frequency converter is connected with the motor of the air preheater through the second contactor; the distributed controller is respectively connected with the frequency converter, the first contactor and the second contactor. Therefore, the first contactor is in a conducting state, the frequency converter is in a running state, and a motor of the air preheater is in a frequency conversion running state; and the second contactor is in a conducting state, the frequency converter is in a shutdown state, and a motor of the air preheater is in a power frequency running state. Therefore, under the condition that the first contactor is controlled to be not conducted and the second contactor is controlled to be conducted through the decentralized controller, the frequency converter can be bypassed, the frequency converter stops working, the frequency converter can be cut off from a control loop of the air preheater, the frequency converter can be prevented from participating in the control operation of the air preheater for a long time, the frequency converter can be prevented from tripping the air preheater due to low-voltage ride through, and therefore the safe and stable operation of the air preheater is guaranteed.
The air preheater is switched from variable frequency start operation to power frequency operation as mentioned above. And the switching time for switching the operation of the power frequency by the frequency conversion starting operation can be determined based on the rotating speed of the air preheater. The following description will be made specifically by taking fig. 2 as an example.
In a specific embodiment, as shown in fig. 2, the air preheater 104 further includes a driving mechanism 1042 and a rotor mechanism 1043, and the motor 1041 is connected to the rotor mechanism 1043 through the driving mechanism 1042;
the air preheater control system 100 further includes: a speed sensor 106; the setting position of the speed sensor 106 is associated with the setting position of the rotor mechanism 1043, and the speed sensor is used for detecting the rotating speed of the rotor mechanism; the speed sensor 106 is connected to the distributed controller 105.
At the initial operation stage of the air preheater, the air preheater is in a frequency conversion starting state, at this time, the frequency converter operates to drive the motor 1041 to operate, and the motor 1041 rotates the rotor mechanism 1043 through the driving mechanism 1042. When the rotating speed of the rotor mechanism 1043 reaches the rated rotating speed, the air preheater can be switched to power frequency operation.
Wherein the setting position of the speed sensor 106 is associated with the setting position of the rotor mechanism 1043, and the speed sensor 106 may be an angular speed sensor for detecting the rotation speed of the rotor mechanism. Since the speed sensor is connected to the decentralized controller, it is possible to determine whether the rotational speed of the rotor mechanism detected by the speed sensor reaches the rated rotational speed by the decentralized controller. When the distributed controller determines that the rotating speed of the rotor mechanism reaches the rated rotating speed, the distributed controller can trigger a switching signal to the frequency converter and the second contactor, control the frequency converter to stop, control the second contactor to be switched on, and enable the air preheater to be switched to power frequency operation.
Like this, detect air heater's rotor mechanism's rotational speed through speed sensor, guarantee that air heater switches into the power frequency operation when rotor mechanism's rotational speed reaches rated speed, and it is long when can reduce air heater's frequency conversion operation to the at utmost, improve the life of converter.
In a specific embodiment, in order to ensure the reliability of the air preheater, the number of the driving mechanisms 1042 may be two, and the driving mechanisms 1042 include a first driving mechanism and a second driving mechanism, which are connected in parallel;
the motor is connected with the rotor mechanism through the first driving mechanism, and the motor is connected with the rotor mechanism through the second driving mechanism.
The driving mechanism 1042 may be a mechanical transmission device, and the motor may drive the rotor mechanism to rotate through the driving mechanism.
Therefore, the first driving mechanism and the second driving mechanism are mutually standby driving mechanisms, and the normal operation of the rotor mechanism can be still ensured under the condition that one of the driving mechanisms fails, so that the reliability of the air preheater is improved.
In another specific embodiment, as shown in fig. 3, the first contactor 102 includes a first contact 1021, and the second contactor 103 includes a second contact 1031; the first end of the frequency converter is connected with the motor of the air preheater through the first contact, and the second end of the frequency converter is connected with the motor of the air preheater through the second contact;
the first contactor and the second contactor interlock; the states of the first contact and the second contact are opposite; in the first contact closed state, the second contact is in an open state; in the first contact open state, the second contact is in a closed state.
It can be understood that the first contactor and the second contactor are interlocked, that is, whether the first contact and the second contact are conducted or not is opposite, that is, the second contact is in an open state when the first contact is in a closed state; in the first contact open state, the second contact is in the closed state.
That is, the air preheater can select power frequency operation or frequency conversion operation. And in the variable-frequency starting operation state of the air preheater, the first contact is closed, and the second contact is opened. And under the power frequency operation state of the air preheater, the first contact is opened, and the second contact is closed. Like this, can guarantee under air heater power frequency running state, through breaking off first contact and closed second contact, make the converter bypass.
The first contact and the second contact may be mechanically interlocked or electrically interlocked, which is described below by way of example.
For example, the interlocking of the first contactor and the second contactor comprises: the first contactor and the second contactor are mechanically interlocked; the set position of the first contactor and the set position of the second contactor are associated with each other in a case where the first contactor and the second contactor are mechanically interlocked.
Under the condition that the first contactor and the second contactor are mechanically interlocked, the setting position of the first contactor is associated with the setting position of the second contactor, and it can be understood that when the first contactor is switched on, the second contactor is clamped by a mechanical structure and cannot be switched on, and only the second contactor is in a switching-off state. When the second contactor is switched on, the first contactor is clamped by the mechanical structure and cannot be switched on, and the first contactor can only be in a switching-off state. Therefore, the states of the first contact and the second contact can be ensured to be opposite by only setting the position of the first contactor and the position of the second contactor, and compared with electric interlocking, the electric interlocking device has the advantages of lower cost and simpler control circuit.
For another example, the first contactor and the second contactor interlock includes: the first contactor and the second contactor are electrically interlocked; under the condition that the first contactor and the second contactor are electrically interlocked, the first contactor further comprises a first normally closed contact, and the second contactor further comprises a second normally closed contact; the first normally closed contact is connected with the second contact, and the second normally closed contact is connected with the first contact.
Therefore, when the first contactor is electrified, the first normally closed contact of the first contactor is disconnected, the loop where the second contact is located is powered off, the second contact is not electrified, and the second contact is in a disconnected state. Similarly, when the second contactor is powered on, the second normally closed contact of the second contactor is disconnected, so that the loop where the first contact is located is powered off, the first contact is not powered on, and the first contact is in a disconnected state. Thus, the first contact and the second contact are ensured to be in opposite states by the electrical interlocking of the first contactor and the second contactor, and the reliability is high compared with the mechanical interlocking.
Further, in order to control the first contactor and the second contactor by the distributed controller, in a specific embodiment, the first contactor further includes a first control coil, the first control coil being separated from the first contact, and the first control coil being used to control a state of the first contact;
the second contactor further comprises a second control coil, the second control coil is separated from the second contact, and the second control coil is used for controlling the state of the second contact;
the air preheater control system further comprises an uninterruptible power supply, and the uninterruptible power supply is respectively connected with the first control coil, the second control coil and the distributed controller.
The first control coil is connected with the distributed controller, the second control coil is connected with the distributed controller, and the distributed controller can be used for controlling whether the first control coil and the second control coil are electrified or not. The uninterruptible power supply can provide power to the control loop in which the first control coil and the second control coil are located. The uninterrupted power supply can be a 220V direct-current power supply, has high reliability, and ensures that the first control coil and the second control coil can stably work.
Specifically, in practical applications, the number of the uninterruptible power supplies may be two, and the uninterruptible power supplies include a first uninterruptible power supply and a second uninterruptible power supply, and the first uninterruptible power supply and the second uninterruptible power supply are connected in parallel. Therefore, the first uninterruptible power supply and the second uninterruptible power supply can be mutually backup power supplies, and the first control coil and the second control coil can still be ensured to stably work under the condition that one uninterruptible power supply fails, so that the stability of the system is further improved.
In addition, as shown in FIG. 3, the air preheater control system further includes an air switch 107 coupled to the second end of the inverter. The air switch can be a circuit breaker of different types and is used for protecting faults such as short circuit, overload and undervoltage and the like on a loop where the frequency converter is located, and the safety of the system is further improved.
In practical application, the air preheater control system further comprises a control cabinet, and the frequency converter, the first contactor and the second contactor are arranged inside the control cabinet. Like this, because there is the feeder electricity distribution room relatively less among the practical application, the not enough problem of screen position, assemble inside a switch board with frequency conversion start control circuit and power frequency operation control circuit simultaneously, effectively reduced the area of control panel.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. An air preheater control system, comprising: the system comprises a frequency converter, a first contactor, a second contactor, an air preheater and a dispersion controller;
the air preheater comprises a motor; the frequency converter is provided with a first end and a second end, the first end of the frequency converter is connected with the motor of the air preheater through the first contactor, and the second end of the frequency converter is connected with the motor of the air preheater through the second contactor;
the distributed controller is respectively connected with the frequency converter, the first contactor and the second contactor.
2. An air preheater control system as recited in claim 1 wherein said air preheater further comprises a drive mechanism and a rotor mechanism, said motor being coupled to said rotor mechanism through said drive mechanism;
the air preheater control system further comprises: a speed sensor; the setting position of the speed sensor is correlated with the setting position of the rotor mechanism; the speed sensor is connected with the decentralized controller.
3. An air preheater control system according to claim 2, wherein the number of drive mechanisms is two, the drive mechanisms including a first drive mechanism and a second drive mechanism, the first and second drive mechanisms being connected in parallel;
the motor is connected with the rotor mechanism through the first driving mechanism, and the motor is connected with the rotor mechanism through the second driving mechanism.
4. The air preheater control system of claim 1, wherein the first contactor comprises a first contact and the second contactor comprises a second contact; the first end of the frequency converter is connected with the motor of the air preheater through the first contact, and the second end of the frequency converter is connected with the motor of the air preheater through the second contact;
the first contactor and the second contactor interlock; the states of the first contact and the second contact are opposite; in the first contact closed state, the second contact is in an open state; in the first contact open state, the second contact is in a closed state.
5. An air preheater control system as recited in claim 4, wherein the interlocking of the first contactor and the second contactor comprises: the first contactor and the second contactor are mechanically interlocked;
the set position of the first contactor and the set position of the second contactor are associated with each other in a case where the first contactor and the second contactor are mechanically interlocked.
6. An air preheater control system as recited in claim 4, wherein the interlocking of the first contactor and the second contactor comprises: the first contactor and the second contactor are electrically interlocked;
under the condition that the first contactor and the second contactor are electrically interlocked, the first contactor further comprises a first normally closed contact, and the second contactor further comprises a second normally closed contact; the first normally closed contact is connected with the second contact, and the second normally closed contact is connected with the first contact.
7. An air preheater control system as recited in claim 4 wherein the first contactor further comprises a first control coil, the first control coil being separate from the first contact and the first control coil being used to control the state of the first contact;
the second contactor further comprises a second control coil, the second control coil is separated from the second contact, and the second control coil is used for controlling the state of the second contact;
the air preheater control system further comprises an uninterruptible power supply, and the uninterruptible power supply is respectively connected with the first control coil, the second control coil and the distributed controller.
8. An air preheater control system as recited in claim 7 wherein the number of upss is two, the upss including a first ups and a second ups, the first ups and the second ups being connected in parallel.
9. An air preheater control system as recited in claim 1 further comprising an air switch connected to the second end of the inverter.
10. An air preheater control system as recited in claim 1 further comprising a control cabinet, the inverter, first contactor, and second contactor all being disposed inside the control cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122872997.8U CN216409904U (en) | 2021-11-22 | 2021-11-22 | Air preheater control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122872997.8U CN216409904U (en) | 2021-11-22 | 2021-11-22 | Air preheater control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216409904U true CN216409904U (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122872997.8U Active CN216409904U (en) | 2021-11-22 | 2021-11-22 | Air preheater control system |
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2021
- 2021-11-22 CN CN202122872997.8U patent/CN216409904U/en active Active
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