CN113340556A - Global overtemperature monitoring and temperature control auxiliary system of plate heater - Google Patents

Global overtemperature monitoring and temperature control auxiliary system of plate heater Download PDF

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Publication number
CN113340556A
CN113340556A CN202011595087.3A CN202011595087A CN113340556A CN 113340556 A CN113340556 A CN 113340556A CN 202011595087 A CN202011595087 A CN 202011595087A CN 113340556 A CN113340556 A CN 113340556A
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heater
temperature
blowing
cooling
global
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CN202011595087.3A
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CN113340556B (en
Inventor
林键
屈振乐
刘训华
张婷婷
郭跃
杨伟
李建伟
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China Academy of Aerospace Aerodynamics CAAA
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China Academy of Aerospace Aerodynamics CAAA
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/02Wind tunnels
    • G01M9/04Details
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02Constructional details
    • G01J5/0205Mechanical elements; Supports for optical elements
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/27Control of temperature characterised by the use of electric means with sensing element responsive to radiation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077Imaging

Abstract

The invention relates to a global overtemperature monitoring and temperature control auxiliary system of a plate heater, which comprises an infrared global temperature measuring unit, an overtemperature control unit and a cooling unit, wherein the infrared global temperature measuring unit adopts an infrared camera to measure the global temperature of the heater; the overtemperature control unit identifies temperature acquisition data, and carries out overtemperature alarm to realize auxiliary control of the operation of the heater; the cooling unit is connected to the original air source of the wind tunnel, and the blowing ring and the blowing nozzle realize the air flow on the surface of the heater shell, so that the cooling of the heater shell is realized; the infrared global temperature measurement unit comprises an infrared camera, a portal frame, a driver, a movable slide rail and a real-time temperature detector, wherein the portal frame is arranged on the movable slide rail and is driven by the driver to slide along the movable slide rail. The invention can measure the temperature of the heater in real time, so that the safe use of the heater is ensured.

Description

Global overtemperature monitoring and temperature control auxiliary system of plate heater
Technical Field
The invention relates to a plate-type heater global overtemperature monitoring and temperature control auxiliary system, and belongs to the technical field of wind tunnel tests.
Background
The wind tunnel plate heat accumulating type heater is equipment working in a high-temperature and high-pressure environment, and the maximum internal temperature is about 800 ℃. The heater shell is generally composed of a front cylinder body and a rear cylinder body which are horizontally placed, flanges are arranged at two ends of the cylinder body, the cylinder body and the flanges are both integrally forged pieces and are formed by machining, and the flanges and the cylinder body are welded together by adopting U-shaped groove submerged arc automatic butt welding. The manufacturing process of the heater ensures that the connected circular seam, the combustion chamber of the heater are insulated and the front and rear connecting seams are numerous and are dangerous points with risks in strength after being heated.
The wind tunnel is frequently used, the utilization rate of the heater is high, and the heater belongs to recycling equipment, so that the usage amount is about 6000 hours every year. The most important part of the heater is the combustion chamber, where the internal temperature is highest, which is the component of major concern. Because the heater belongs to the early design, does not have overtemperature detection device, the temperature measurement mainly depends on the manual work to the local point temperature measurement of casing, and non-real-time measurement, the human error is big, and the uncertainty is great.
The discovery during overhauls many times, and the inside long time department of heater combustion chamber has the fracture condition under high temperature state welding department, and heat preservation lining section of thick bamboo service life is longer, and local heat preservation drops and causes local overtemperature, is another potential safety hazard that is difficult to perceive.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects in the prior art are overcome, the plate-type heater overall overtemperature monitoring and temperature control auxiliary system is provided, the running hidden danger of the heater is solved, and the safe and orderly running of the wind tunnel test is guaranteed.
The technical scheme of the invention is as follows:
an auxiliary system for overall overtemperature monitoring and temperature control of a plate heater comprises an infrared overall temperature measuring unit, an overtemperature control unit and a cooling unit,
the infrared global temperature measuring unit measures the temperature of the heater globally by adopting an infrared camera;
the overtemperature control unit identifies temperature acquisition data, and carries out overtemperature alarm to realize auxiliary control of the operation of the heater;
the cooling unit is connected to the original air source of the wind tunnel, and the blowing ring and the blowing nozzle realize the air flow on the surface of the heater shell, so that the cooling of the heater shell is realized;
the infrared global temperature measuring unit comprises an infrared camera, a portal frame, a driver, a movable slide rail and a real-time temperature measurer,
the portal frame is arranged on the movable slide rail and is driven by the driver to slide along the movable slide rail;
the infrared cameras are uniformly distributed on the portal frame, the plate-type heater is arranged below the portal frame, the temperature of the plate-type heater shell can be measured globally at 360 degrees, if the measured value is greater than the warning value, the plate-type heater shell at the position where the measured value is greater than the warning value is cooled through the cooling unit, and if the measured value is still greater than the warning value within 6-15min, the heating inside the plate-type heater is stopped;
the over-temperature control unit is used for monitoring whether the temperature exceeds the standard or not and controlling the air blowing of the cooling unit and the heating of the heater or not;
the cooling unit comprises a blowing nozzle, a downstream blowing ring, an upstream blowing ring, a combustion chamber blowing ring, an electromagnetic valve and an air source pipeline,
the downstream blowing cooling ring, the upstream blowing cooling ring and the combustion chamber blowing cooling ring are all connected with an air source pipeline, blowing cooling nozzles are uniformly distributed on the blowing cooling ring to form a cooling wind field along the outer wall surface of the heater, air in the air source pipeline passes through the blowing cooling ring and is finally sprayed out by the blowing cooling nozzles, and the sprayed air acts on the shell of the plate-type heater to cool the shell of the plate-type heater at the position where the measured value is greater than the warning value.
Furthermore, the refresh rate of the infrared camera does not exceed 1 second, and the temperature resolution is not greater than 1 ℃.
Further, the plate-type heater comprises a combustion chamber and a heat accumulator, and the combustion chamber is connected with the heat accumulator; the regenerator includes an upstream section proximate the combustion chamber and a downstream section.
Furthermore, the nozzle forms an included angle of 40-50 degrees with the axis of the shell, and air is sprayed by focusing on one point on the axis to form an annular cooling air field.
Furthermore, the air source pipeline is connected with a medium pressure air source pipeline of the wind tunnel, and the provided pressure is not less than 1 MPa.
Furthermore, the cold blowing rings are respectively positioned at the front part, the middle part and the rear part of the heater main body and respectively correspond to the combustion chamber, the front shell section and the rear shell section.
Furthermore, the electromagnetic valve is controlled by the over-temperature control unit and can be independently opened to supply air to the cooling blowing rings at different positions.
Furthermore, the cooling unit is connected with the medium-pressure gas tank to obtain a stable pressure gas source, and sectional gas supply is provided through cold blowing rings respectively arranged at the positions of the combustion chamber of the heater, the front section of the shell and the rear section of the shell.
Furthermore, the cooling unit is controlled by an over-temperature control unit to send out instructions to the electromagnetic valves, and the corresponding electromagnetic valves are controlled to be opened according to different over-temperature positions, so that air can be supplied to the downstream blowing ring, the upstream blowing ring and the combustion chamber blowing ring respectively, and then the air is sprayed out by the blowing nozzles.
Furthermore, the over-temperature control unit controls the driver to drive the portal frame to move axially along the track.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the infrared cameras are uniformly distributed in the circumferential direction of the heater and are arranged on the portal frame, so that the temperature of the heater in a 360-degree structure can be measured in real time, the heating process can be adjusted in real time, and the limitation of point measurement of the original sensor is avoided;
(2) in order to save the installation space of the camera, the invention adopts the installation form of combining the slide rail and the portal frame to longitudinally scan the temperature of the heater, thereby avoiding the problems of overlarge view field and inaccurate local temperature;
(3) the invention can measure the temperature below 1000 ℃, display the temperature measurement in real time, refresh rate of 1 second and temperature resolution of 1 ℃;
(4) the invention can measure the temperature of the heater in real time, so that the safe use of the heater is ensured, in addition, the overtemperature and the heating can be controlled, the overtemperature control and the heating operation can be realized by adopting an automatic method, and the sectional cooling of the heater can be completed by a cooling system.
Drawings
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a schematic diagram of an infrared global temperature measurement unit according to the present invention;
FIG. 3 is a flowchart of an over-temperature control strategy of the present invention;
FIG. 4 is a schematic view of a cooling unit of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
A global overtemperature monitoring and temperature control auxiliary system of a plate heater is shown in figure 1 and comprises an infrared global temperature measuring unit 101, an overtemperature control unit 102 and a cooling unit 103,
the infrared global temperature measurement unit 101 measures the temperature of the heater globally by adopting an infrared camera;
the overtemperature control unit 102 identifies temperature acquisition data, carries out overtemperature alarm and realizes auxiliary control of the operation of the heater;
the cooling unit 103 is connected to an original air source of the wind tunnel, and the cooling ring and the cooling nozzle realize the air flow on the surface of the heater shell, so that the heater shell is cooled;
as shown in fig. 2, the infrared global thermometric unit 101 comprises an infrared camera 201, a gantry 202, a driver 203, a movable slide 204 and a real-time thermometric unit 205,
the gantry 202 is arranged on the movable slide rail 204, and the gantry 202 is driven by the driver 203 to slide along the movable slide rail 204;
the infrared cameras 201 are uniformly distributed on the portal frame, the plate-type heater 104 is arranged below the portal frame, the temperature of the plate-type heater shell can be measured globally at 360 degrees, if the measured value is greater than an alarm value, the plate-type heater shell at the position where the measured value is greater than the alarm value is cooled through the cooling unit 103, and if the measured value is still greater than the alarm value within 6-15min, the heating inside the plate-type heater is stopped;
the overtemperature control unit 102 is used for monitoring whether the temperature exceeds the standard or not, and controlling the cooling unit to blow air and the heater to heat or not;
as shown in fig. 4, the cooling unit 103 includes a blow-cooling nozzle 301, a downstream blow-cooling ring 302, an upstream blow-cooling ring 303, a combustion chamber blow-cooling ring 304, a solenoid valve 305, and a gas source pipe 306,
the downstream blowing-cooling ring 302, the upstream blowing-cooling ring 303 and the combustion chamber blowing-cooling ring 304 are all connected with a gas source pipeline 306, the blowing-cooling nozzles 301 are uniformly distributed on the blowing-cooling ring to form a cooling wind field along the outer wall surface of the heater, gas in the gas source pipeline 306 passes through the blowing-cooling ring and is finally sprayed out by the blowing-cooling nozzles, and the sprayed gas acts on the shell of the plate-type heater to cool the shell of the plate-type heater at the position with the measured value greater than the warning value.
The refresh rate of the infrared camera 201 is not more than 1 second, and the temperature resolution is not more than 1 ℃. The plate-type heater comprises a combustion chamber and a heat accumulator, and the combustion chamber is connected with the heat accumulator; the regenerator includes an upstream section proximate the combustion chamber and a downstream section.
The nozzle forms an included angle of 40-50 degrees with the axis of the shell, and is focused on one point on the axis to spray air to form an annular cooling air field.
The air source pipeline 306 is connected with a medium-pressure air source pipeline of the wind tunnel and provides pressure not less than 1 MPa.
The cooling blowing rings are respectively positioned at the front part, the middle part and the rear part of the heater main body and respectively correspond to the combustion chamber, the front section of the shell and the rear section of the shell.
The solenoid valve 305 is controlled by the over-temperature control unit and can be independently opened to supply air to the cooling rings at different positions.
The cooling unit 103 is connected with the medium-pressure gas tank to obtain a stable pressure gas source, and sectional gas supply is provided through cold blowing rings respectively arranged at the positions of the combustion chamber of the heater, the front section of the shell and the rear section of the shell.
The cooling unit is controlled by an instruction sent to the electromagnetic valve 305 through the overtemperature control unit 102, and the corresponding electromagnetic valve 305 is controlled to be opened according to different overtemperature positions, so that air can be supplied to the downstream blowing ring 302, the upstream blowing ring 303 and the combustion chamber blowing ring 304 respectively, and then the air is sprayed out from the blowing nozzle 301.
The over-temperature control unit 102 controls the driver 203 to drive the gantry to move axially along the rail.
The steps of evaluating and deciding the heater operation condition by the over-temperature control unit 102 are shown in fig. 3:
step 1, heating by a heater, and when the internal temperature of the heater reaches a specified temperature, starting temperature monitoring on the whole situation by an auxiliary system;
step 2, dynamically monitoring the temperature of the heater shell in real time;
step 3, judging overtemperature, and if the temperature of the shell does not exceed the safe temperature, continuing heating; if the temperature of the shell exceeds the safe temperature, the heating is suspended, the overtemperature alarm is given, and the cooling unit 103 is started;
step 4, dynamically monitoring the shell after the cooling unit is started in real time;
and 5, judging overtemperature, if the temperature of the shell returns to below the safe temperature, continuing heating, and if the temperature of the shell exceeds the safe temperature again, alarming for overtemperature, stopping heating and suggesting maintenance.
As an independent device, the operation auxiliary system is used for improving the structure and the operation program of the original wind tunnel heater, effectively solving the overtemperature monitoring problem of a combustion chamber of the heater, particularly solving the random overtemperature point position judgment problem caused by the falling of the heat insulation material in the heater, and effectively ensuring the safe and orderly operation of wind tunnel equipment.
According to the invention, the infrared cameras are uniformly distributed in the circumferential direction of the heater and are arranged on the portal frame, so that the temperature of the heater in a 360-degree structure can be measured in real time, the heating process can be adjusted in real time, and the limitation of point measurement of the original sensor is avoided;
in order to save the installation space of the camera, the invention adopts the installation form of combining the slide rail and the portal frame to longitudinally scan the temperature of the heater, thereby avoiding the problems of overlarge view field and inaccurate local temperature;
the invention can measure the temperature below 1000 ℃, display the temperature measurement in real time, refresh rate of 1 second and temperature resolution of 1 ℃;
the invention can measure the temperature of the heater in real time, so that the safe use of the heater is ensured, in addition, the overtemperature and the heating can be controlled, the overtemperature control and the heating operation can be realized by adopting an automatic method, and the sectional cooling of the heater can be completed by a cooling system.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims (10)

1. A global overtemperature monitoring and temperature control auxiliary system of a plate heater is characterized by comprising an infrared global temperature measuring unit (101), an overtemperature control unit (102) and a cooling unit (103),
the infrared global temperature measurement unit (101) measures the temperature of the heater globally by adopting an infrared camera;
the overtemperature control unit (102) identifies temperature acquisition data, and carries out overtemperature alarm to realize auxiliary control of the operation of the heater;
the cooling unit (103) is connected to an original air source of the wind tunnel, and the blowing ring and the blowing nozzle realize the air flow on the surface of the heater shell so as to realize the cooling of the heater shell;
the infrared global temperature measurement unit (101) comprises an infrared camera (201), a portal frame (202), a driver (203), a movable slide rail (204) and a real-time temperature measurement device (205),
the portal frame (202) is arranged on the movable sliding rail (204), and the portal frame (202) is driven by the driver (203) to slide along the movable sliding rail (204);
the infrared cameras (201) are uniformly distributed on the portal frame, the plate-type heaters (104) are arranged below the portal frame, the temperature of the plate-type heater shell can be measured globally at 360 degrees, if the measured value is greater than an alarm value, the plate-type heater shell at the position where the measured value is greater than the alarm value is cooled through the cooling unit (103), and if the measured value is still greater than the alarm value within 6-15min, the heating inside the plate-type heaters is stopped;
the over-temperature control unit (102) is used for monitoring whether the temperature exceeds the standard or not, and controlling the blowing of the cooling unit and the heating of the heater or not;
the cooling unit (103) comprises a blowing nozzle (301), a downstream blowing ring (302), an upstream blowing ring (303), a combustion chamber blowing ring (304), an electromagnetic valve (305) and an air source pipeline (306),
the downstream blowing cooling ring (302), the upstream blowing cooling ring (303) and the combustion chamber blowing cooling ring (304) are all connected with a gas source pipeline (306), blowing cooling nozzles (301) are uniformly distributed on the blowing cooling ring to form a cooling wind field along the outer wall surface of the heater, gas in the gas source pipeline (306) is sprayed out through the blowing cooling ring and finally sprayed out through the blowing cooling nozzles, and the sprayed gas acts on the shell of the plate-type heater to cool the shell of the plate-type heater, wherein the measured value of the shell of the plate-type heater is greater than the warning value.
2. The plate heater global over-temperature monitoring and temperature control auxiliary system according to claim 1, wherein the refresh rate of the infrared camera (201) is not more than 1 second, and the temperature resolution is not more than 1 ℃.
3. The plate heater global overtemperature monitoring and temperature control auxiliary system of claim 1, wherein the plate heater comprises a combustion chamber and a regenerator, the combustion chamber is connected with the regenerator; the regenerator includes an upstream section proximate the combustion chamber and a downstream section.
4. The plate heater global overtemperature monitoring and temperature control auxiliary system of claim 1, wherein the nozzle forms an included angle of 40-50 degrees with the axis of the shell, and the nozzle focuses on a point on the axis to spray air to form an annular cooling air field.
5. The plate heater global over-temperature monitoring and temperature control auxiliary system as claimed in claim 1, wherein the air source pipeline (306) is connected with a medium pressure air source pipeline of the wind tunnel, and the provided pressure is not less than 1 MPa.
6. The plate heater global over-temperature monitoring and temperature control auxiliary system according to claim 1, wherein the cooling blowing rings are respectively located at the front, middle and rear parts of the heater main body, and respectively correspond to the combustion chamber, the front shell section and the rear shell section.
7. The plate heater global over-temperature monitoring and temperature control auxiliary system according to claim 1, characterized in that the solenoid valve (305) is controlled by the over-temperature control unit to independently open the air supply to the cooling ring at different positions.
8. The plate heater global overtemperature monitoring and temperature control auxiliary system as claimed in claim 1 is characterized in that the cooling unit (103) is connected with a medium-pressure gas tank to obtain a stable pressure gas source, and segmented gas supply is provided through cold blowing rings respectively arranged at the positions of the heater combustion chamber, the front section of the shell and the rear section of the shell.
9. The plate heater global over-temperature monitoring and temperature control auxiliary system according to claim 1, wherein the control of the cooling unit is performed by an instruction sent by the over-temperature control unit (102) to the electromagnetic valve (305), and the corresponding electromagnetic valve (305) is controlled to open according to different over-temperature positions, so that air can be supplied to the downstream blowing cooling ring (302), the upstream blowing cooling ring (303) and the combustion chamber blowing cooling ring (304) respectively, and then the air is sprayed out from the blowing cooling nozzle (301).
10. The plate heater global over-temperature monitoring and temperature control auxiliary system as claimed in claim 1, wherein the over-temperature control unit (102) controls the driver (203) to drive the gantry to move axially along the rail.
CN202011595087.3A 2020-12-29 2020-12-29 Global overtemperature monitoring and temperature control auxiliary system for plate heater Active CN113340556B (en)

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