CN114199393A - Temperature measuring device under bad working condition - Google Patents
Temperature measuring device under bad working condition Download PDFInfo
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- CN114199393A CN114199393A CN202111433222.9A CN202111433222A CN114199393A CN 114199393 A CN114199393 A CN 114199393A CN 202111433222 A CN202111433222 A CN 202111433222A CN 114199393 A CN114199393 A CN 114199393A
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- thermocouple
- electromagnetic valve
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- measuring device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- General Physics & Mathematics (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model provides a temperature measuring device under abominable operating mode, including action driver (1), controller (2), thermocouple (5), position measurement unit, the cooling protection presss from both sides the cover, install in the cooling protection presss from both sides in thermocouple (5), action driver (1) passes through connecting piece (4) fixed connection with thermocouple (5), position measurement unit real-time detection thermocouple (5) are in the cooling protection presss from both sides the interior position of cover and pass to controller (2), real-time position control action driver (1) action of controller (2) according to operating mode and thermocouple (5), stretch out the cooling protection and press from both sides the cover outside or carry out temperature measurement inside the cooling protection presss from both sides the cover by the measuring end that action driver (1) drove thermocouple (5). The thermocouple temperature measurement device drags the thermocouple (5) to move back and forth by controlling the action driver (1), so that accurate temperature measurement of different positions of the thermocouple (5) in the whole stroke is realized; meanwhile, the thermocouple (5) is retracted into the cooling protective jacket under the severe working condition, and the protective gas is introduced for cooling protection, so that the damage is avoided.
Description
Technical Field
The invention belongs to the technical field of energy control, and particularly relates to a temperature measuring device.
Background
The temperature control of the gasification hearth is the key for the operation control of the gasification process, and the temperature can affect the indexes of the service life of refractory bricks, slag discharge of the gasification furnace, effective gas composition and the like, so that the accurate measurement of the reaction temperature is very important.
Since the development and operation of the Texaco gasification process, a thermocouple temperature measurement method is always a standard method for measuring the temperature of a gasification furnace. The accurate reliability of thermocouple temperature measurement is the guarantee of gasifier safe high-efficient operation. In order to prolong the service life of the thermocouple, the end part of the thermocouple generally retracts 10-20 mm more than the inner wall of the hearth, some users retract 100mm or more, the difference between the measured value and the actual temperature of the hearth can reach 500 ℃, and the reliable operation of the gasification device is seriously influenced. Therefore, it is necessary to develop a temperature measuring device which can accurately measure temperature in real time and prevent the thermocouple from being damaged too quickly.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the temperature measuring device under the severe working condition is provided, and accurate temperature measurement of different positions of the whole stroke of the thermocouple is realized by continuously adjusting the position of the thermocouple on line. Meanwhile, under severe working conditions, the thermocouple is retracted into the cooling protective jacket, and protective gas is introduced for purging and cooling protection, so that damage is avoided.
The technical solution of the invention is as follows: the utility model provides a temperature measuring device under abominable operating mode, including the action driver, a controller, the thermocouple, position measurement unit and cooling protection jacket, the thermocouple is installed in cooling protection jacket, the action driver passes through connecting piece fixed connection with the non-measuring end of thermocouple, position measurement unit real-time detection thermocouple position in cooling protection jacket and conveying to the controller, the controller is according to the real-time position control action driver action of operating condition and thermocouple, the measuring end that drives the thermocouple by the action driver stretches out cooling protection jacket outside or carries out temperature measurement inside cooling protection jacket.
Optionally, the cooling protective jacket is of a multi-layer sleeve type structure and comprises an inner pipe, a middle pipe and an outer pipe which are coaxially arranged from inside to outside; the rear end of the inner pipe is provided with a driver connecting flange to seal the rear end, the side wall of the inner pipe is provided with a shielding gas inlet, and the front end of the inner pipe is connected with the outer pipe through an end cover; the rear end of the outer pipe is provided with a cooling water end flange for sealing the rear end, and the side wall of the outer pipe is provided with a cooling water inlet and outlet; the middle pipe divides a cooling water channel formed between the inner pipe and the outer pipe into an inner layer and an outer layer, and cooling water is supplied from the inner layer to the outer layer through the cooling water inlet and outlet or is supplied from the outer layer to the inner layer and is led out.
Optionally, the thermocouple is installed in the inner tube, and is in mutual dynamic sealing with the driver connecting flange through a sealing element.
Optionally, the cooling water is desalted water, and the flow rate is 0.5-5 t/h.
Optionally, air, nitrogen, carbon dioxide, argon or circulating synthesis gas is supplied into the protective gas inlet, and the gas flow is 2-20 Nm3The flow rate of the gas is 0.5-2 m/s.
Optionally, the position measuring unit includes a position sensor, a position switch and a positioning plate, the positioning plate is mounted on the connecting piece, the position sensor is mounted on the support, the support is used for connecting the action driver and the driver connecting flange, the position switches are arranged at the maximum position of the front end and the maximum position of the rear end of the movement of the measuring end of the thermocouple, and the position sensor and the position switch obtain the position signal of the thermocouple through the positioning plate.
Optionally, the outer surface of the thermocouple is provided with a wear-resistant and high-temperature-resistant ceramic protective sleeve.
Optionally, the action driver is a single-action pneumatic actuator, an external air source is connected to the controller after being filtered and decompressed, the output air path is connected to the rear end of the single-action pneumatic actuator through a redundant double-two-position three-way electromagnetic valve, and forward or backward action is executed through the difference between the air pressure of the rear end and the elastic force of the front spring.
Optionally, the motion driver is a double-acting pneumatic actuator, an external air source is filtered and decompressed and then connected to the controller, then two air paths with pressures of p1 and p2 are formed, a p1 air path is connected to the rear end of the double-acting pneumatic actuator through a redundant double two-position three-way electromagnetic valve, a p2 air path is connected to the front end of the double-acting pneumatic actuator, and forward or backward motion is performed through the difference between the air pressure of the front end and the air pressure of the rear end.
Optionally, the redundant double-two-position three-way electromagnetic valve includes a first electromagnetic valve and a second electromagnetic valve, air source interfaces of the first electromagnetic valve and the second electromagnetic valve are connected with an output air path of the controller, a common port of the first electromagnetic valve is connected in series with an exhaust port of the second electromagnetic valve, a common port of the second electromagnetic valve is connected with the pneumatic actuator, and control ends of the first electromagnetic valve and the second electromagnetic valve are connected with an external switch control signal.
Compared with the prior art, the invention has the advantages that:
(1) the thermocouple temperature measuring device can drag the thermocouple to move back and forth by controlling the action driver, continuously adjust the position of the thermocouple, and realize accurate temperature measurement at different positions of the thermocouple full stroke;
(2) in order to adapt to severe working conditions such as high temperature, corrosion, scouring and impurity pollution, the invention arranges a wear-resistant and high-temperature-resistant ceramic protective sleeve on the outer surface of the thermocouple, retracts the whole thermocouple into a cooling protective jacket, and blows in protective gas to sweep and cool the thermocouple, thereby avoiding damage and prolonging the service life; the cooling protection jacket is filled with circulating cooling water for cooling protection, so that the service life is long;
(3) the design of the redundant double electromagnetic valves of the control gas circuit can not only avoid control failure after one electromagnetic valve coil fails, but also realize the interlocking closing in emergency and fast return the thermocouple to the protection position.
Drawings
FIG. 1 is a schematic diagram of a temperature measuring device according to the present invention;
FIG. 2 is a schematic diagram of the thermocouple operation of the temperature measuring device of the present invention;
FIG. 3 is a control diagram of the temperature measuring device according to the present invention;
FIG. 4 is a schematic view of another control of the temperature measuring device of the present invention;
FIG. 5 is a correction coefficient curve of the shield gas flow and the extension distance versus temperature measurement of the temperature measuring device of the present invention.
Reference numerals
In the figure: 1, an action driver; 2, a controller; 3, a bracket; 4, connecting pieces; 5, a thermocouple; 6, sealing element; 7.1, 7.2 position switches; 8 a position sensor; 9 positioning sheets; 10 driver connection flange; 11 an inner tube; 12 a shielding gas inlet; 13 cooling water end flanges; 14 an outer tube; 15. 16 cooling water inlet and outlet; 17, a middle pipe; 18 mounting a flange; 19 end caps; 20 a filter pressure reducing valve; 21 two-position three-way electromagnetic valve; 22 single-acting pneumatic actuators; 23 double acting pneumatic actuators.
Detailed Description
The temperature measuring device of the present invention will be described in further detail with reference to the drawings and examples of the specification.
As shown in fig. 1, the temperature measuring device of the present invention mainly comprises: motion driver 1, controller 2, thermocouple 5, position sensor 8, position switches 7.1, 7.2, cooling protection jacket and seal 6.
Wherein the cooling protection jacket is composed of an inner layer sleeve, a middle layer sleeve and an outer layer sleeve which are coaxially arranged: the rear end of the inner pipe 11 is provided with a driver connecting flange 10 to seal the rear end, the side wall is provided with a shielding gas inlet 12, and the front end is connected with the outer pipe 14 through an end cover 19. The rear end of the outer pipe 14 is provided with a cooling water end flange 13 for sealing the rear end, and the side wall of the outer pipe is provided with a cooling water inlet 15, a cooling water outlet 16 and a mounting flange 18; the middle pipe 17 divides a cooling water channel formed between the inner pipe 11 and the outer pipe 14 into an inner layer and an outer layer, and cooling water can be supplied from the inner layer to the outer layer to be led out or supplied from the outer layer to the inner layer to be led out. The cooling protection jacket is integrally mounted on the part to be measured in temperature through a mounting flange 18.
The thermocouple 5 is installed in the inner tube 11 of the cooling protection jacket and is in mutual dynamic sealing with the driver connecting flange 10 through the sealing piece 6.
The action driver 1 is arranged at the rear end of the cooling protection jacket through a bracket 3, is connected with the thermocouple 5 through a connecting piece 4 and is used for driving the thermocouple 5 to move along the axial direction so as to adjust the position of the temperature measuring head of the thermocouple 5; the motion driver 1 is controlled by a controller 2.
The position of the working head of the thermocouple 5 is indicated by a position sensor 8 arranged on the bracket 3, position switches 7.1 and 7.2 are arranged at the maximum position of the front end and the maximum position of the rear end for indicating, and the position sensor 8 and the position switches 7.1 and 7.2 obtain position signals through a positioning sheet 9 on the induction connecting piece 4 and feed back the position signals to the controller 2.
In order to adapt to severe working conditions such as high temperature, corrosion, scouring and impurity pollution, the outer surface of the thermocouple 5 is also provided with a protective sleeve. The protective sleeve is made of ceramic materials such as corundum and silicon carbide with excellent heat conduction performance, mechanical performance, wear resistance and high temperature resistance, and the service life of the thermocouple 5 can be effectively prolonged.
The shielding gas inlet 12 can be used for supplying air, nitrogen, carbon dioxide, argon, circulating synthesis gas and other gases with the flow rate of 2-20 Nm3H is used as the reference value. The flow speed of the protective gas in the inner pipe 11 needs to be controlled within the range of 0.5-2 m/s, and cannot be too low, so that the purging protection effect cannot be realized; the temperature of the thermocouple can not be too high, and the accuracy of temperature measurement of the thermocouple can be influenced.
The cooling water inlet 15 is used for supplying circulating desalted water, and the flow rate is 0.5-5 t/h. When the flow rate of the cooling water is too low, the flow rate of the water in the cooling water channel is low, the convective heat transfer effect is poor, and the cooling protection effect on the jacket is poor; when the flow rate of the cooling water is too high, the flow rate of the water in the cooling water channel is high, and the circulating water flows to a larger power assisting device. When the cooling water flow is measured to be low, the temperature rise of the cooling water inlet and the cooling water outlet is possibly large, and at the moment, the cooling water is led out from the inner layer to the outer layer.
Fig. 3 shows a specific embodiment of the actuator 1 according to the invention, in which the actuator 1 is a single-acting pneumatic actuator 22.
An instrument gas source is connected with a filtering pressure reducing valve 20 in series and is connected with a controller 2, and an output gas circuit of the controller 2 is connected with a redundant double-two-position three-way electromagnetic valve 21 in a mixed mode and is connected with the rear end of a single-action pneumatic actuator 22.
The control signals comprise 4-20 mA continuous position electric signals input into the controller 2 and switching value signals input into the redundant double two-position three-way electromagnetic valve 21. The controller 2 receives input 4-20 mA continuous position control signals, and the redundant double two-bit three-way electromagnetic valve 21 receives input switch control signals at the same time.
The controller 2 compares the input position electric signal with the feedback signal of the position sensor 8, if the signal deviation exists, the controller 2 increases the pressure p of the output gas path by adjusting, the rear air pressure in the single-action pneumatic actuator 22 is larger than the elastic force of the front spring, and the actuator moves forwards; otherwise, the actuator moves backwards until the input signal is equal to the position feedback signal.
Fig. 4 shows another embodiment of a motion drive 1 according to the invention, wherein the motion drive 1 is a double-acting pneumatic actuator 23.
The instrument gas source series connection filtering pressure reducing valve 20 is connected to the controller 2, the controller 2 outputs two paths of gas paths with pressure p1 and pressure p2 respectively, the p1 gas path series-parallel redundant double two-position three-way electromagnetic valve 21 is connected to the rear end of the double-acting pneumatic actuator 23, and the p2 gas path is connected to the front end of the double-acting pneumatic actuator 23.
The control signals comprise 4-20 mA continuous position electric signals input into the controller 2 and switching value signals input into the redundant double two-position three-way electromagnetic valve 21. The controller 2 receives input 4-20 mA continuous position control signals, and the redundant double two-bit three-way electromagnetic valve 21 receives input switch control signals at the same time.
The controller 2 compares the input position electric signal with the position sensor feedback signal, if the signal deviation exists, the controller 2 adjusts the pressure p1 and p2 of the output gas circuit, the pressure p1 is more than p2, the rear air pressure in the double-acting pneumatic actuator 23 is larger than the front air pressure, and the actuator moves forwards; otherwise, the actuator moves backwards until the input signal is equal to the position feedback signal.
As shown in fig. 3 and 4, the redundant two-position three-way solenoid valve 21 is connected as follows: the air source interfaces 1 of the two-position three-way electromagnetic valves 21 are connected with the output air circuit of the controller 2 in parallel, the common port 2 of the first electromagnetic valve is connected with the exhaust port 3 of the second electromagnetic valve in series, the common port 2 of the second electromagnetic valve is connected with the pneumatic actuators 22 and 23, and the exhaust port 3 of the first electromagnetic valve is emptied. Two solenoid valves are mutually backed up, and control failure after a coil of one solenoid valve is in failure is avoided.
The working process of the redundant double two-position three-way electromagnetic valve 21 is as follows: when the electromagnetic valves are electrified, the ports 1 and 2 are communicated, when the electromagnetic valves are not electrified, the ports 2 and 3 are communicated, correspondingly, the double electromagnetic valves receive opening signals, when the two electromagnetic valves are in normal electrified work, the ports 1 and 2 are communicated, and an air source enters the pneumatic actuators 22 and 23 through the ports 1 and 2 of the second electromagnetic valve; when the first electromagnetic valve is in fault, the ports 2 and 3 of the first electromagnetic valve are communicated, and an air source enters the pneumatic actuators 22 and 23 through the ports 1 and 2 of the second electromagnetic valve; when the second electromagnetic valve is in fault, the 2 ports and the 3 ports of the second electromagnetic valve are communicated, the air source enters the pneumatic actuators 22 and 23 through the 1 port and the 2 ports of the first electromagnetic valve and the 3 ports of the second electromagnetic valve, the 2 output air paths of the controllers input to the rear ends of the pneumatic actuators 22 and 23 are communicated, and position control can be normally performed.
The double electromagnetic valves receive the closing signals, the two electromagnetic valves are all powered off, the gas at the rear parts of the pneumatic actuators 22 and 23 passes through the ports 2 and 3 of the second electromagnetic valve, the ports 2 and 3 of the first electromagnetic valve are exhausted, and the pneumatic actuators 22 and 23 retreat to the rear ends.
The working principle of the invention is as follows:
when the temperature measurement is carried out, the electromagnetic valve 21 receives an on signal, a position signal is input to the controller 2, the controller 2 controls the action driver 1 to move forwards and backwards, and the head of the thermocouple 5 extends out of the cooling protection jacket and is sent to a working position set at the front end. As shown in figure 2, the maximum position of the front end of the thermocouple extends out of the end face of the jacket by a distance H, and the thermocouple can realize continuous temperature measurement at any position within the range of 0-H of the front end.
When the protection working condition is met, the electromagnetic valve 21 receives an off signal, the action driver 1 rapidly moves backwards, and the head of the thermocouple 5 is retracted into the cooling protection jacket and sent to the rear end protection position. As shown in FIG. 2, the maximum position of the rear end of the thermocouple is retracted into the end face of the jacket by a distance h, and h is greater than or equal to d to ensure the protection effect of the thermocouple, wherein d is the inner diameter of the inner tube 11. The stroke L of the actuator 1 is H + H.
Since the introduced protection gas flow sweeps over the surface of the thermocouple 5 and affects the temperature measurement of the thermocouple 5, and the larger the protection gas flow is, the larger the influence is on the end surface of the cooling protection jacket, it is also necessary to establish a correction coefficient ξ, η curve of the protection gas flow and the extension distance on the temperature measurement, as shown in fig. 5, the curve is obtained by experiments. During the test, the control variable method is adopted, when the flow correction coefficient xi curve is obtained, the extending distance H is kept unchanged, firstly, the true temperature value T is measured without introducing protective gas0Then, by changing the protective gas flow, the temperature measured value T at different protective gas flow is measuredξWhere is the true value of temperature T0Measured value TξFurther drawing a flow correction coefficient curve; similarly, when the distance correction coefficient eta curve is calculated, the protective gas with the same flow is kept introduced, and firstly, the extension distance H is set to measure the true temperature value T0Then, by changing the extending distance, the temperature measured value T at different extending distances is measuredηEta is true temperature value T0Measured value TηAnd then a distance correction coefficient curve is drawn. During normal use, the true temperature value T0Measured value T "ξ" η.
In order to ensure the accuracy of temperature measurement, another operation method is as follows: the protective gas inlet 12 is interlocked to stop supplying protective gas during temperature measurement, and the protective gas is interlocked to be introduced when the temperature measurement is finished under the protection working condition.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. The utility model provides a temperature measuring device under abominable operating mode which characterized in that: including action driver (1), controller (2), thermocouple (5), position measurement unit and cooling protection jacket, install in cooling protection jacket thermocouple (5), action driver (1) passes through connecting piece (4) fixed connection with the non-measuring end of thermocouple (5), position measurement unit real-time detection thermocouple (5) position in cooling protection jacket and conveying to controller (2), real-time position control action driver (1) action of controller (2) according to operating condition and thermocouple (5), stretch out cooling protection jacket outside or carry out temperature measurement inside cooling protection jacket by the measuring end that action driver (1) drove thermocouple (5).
2. The temperature measuring device under the severe working condition of claim 1, wherein: the cooling protective jacket is of a multi-layer sleeve type structure and comprises an inner pipe (11), a middle pipe (17) and an outer pipe (14) which are coaxially arranged from inside to outside; the rear end of the inner pipe (11) is provided with a driver connecting flange (10) for sealing the rear end, the side wall of the inner pipe is provided with a shielding gas inlet (12), and the front end of the inner pipe is connected with the outer pipe (14) through an end cover (19); the rear end of the outer pipe (14) is provided with a cooling water end flange (13) for sealing the rear end, and the side wall of the outer pipe is provided with cooling water inlets and outlets (15 and 16); the middle pipe (17) divides a cooling water channel formed between the inner pipe (11) and the outer pipe (14) into an inner layer and an outer layer, and cooling water is supplied from the inner layer to the outer layer and led out or supplied from the outer layer to the inner layer and led out through cooling water inlets and outlets (15, 16).
3. The temperature measuring device under the severe working condition of claim 2, wherein: the thermocouple (5) is arranged in the inner pipe (11) and is in mutual dynamic sealing with the driver connecting flange (10) through a sealing element (6).
4. The temperature measuring device under the severe working condition of claim 2, wherein: the cooling water is desalted water, and the flow rate is 0.5-5 t/h.
5. The temperature measuring device under the severe working condition of claim 2, wherein: the protective gas inlet (12) is used for supplying air, nitrogen, carbon dioxide, argon or circulating synthesis gas, and the gas flow is 2-20 Nm3The flow rate of the gas is 0.5-2 m/s.
6. The temperature measuring device under the severe working condition of claim 2, wherein: the position measuring unit comprises a position sensor (8), position switches (7.1, 7.2) and a positioning sheet (9), the positioning sheet (9) is installed on a connecting piece (4), the position sensor (8) is installed on a support (3), the support (3) is used for connecting an action driver (1) and a driver connecting flange (10), the position switches (7.1, 7.2) are arranged at the maximum position of the front end and the maximum position of the rear end of the movement of the measuring end of the thermocouple (5), and the position sensor (8) and the position switches (7.1, 7.2) obtain a position signal of the thermocouple (5) through the positioning sheet (9).
7. The temperature measuring device under the severe working condition of claim 2, wherein: and a wear-resistant high-temperature-resistant ceramic protective sleeve is arranged on the outer surface of the thermocouple (5).
8. The temperature measuring device under the severe working condition of claim 2, wherein: the action driver (1) is a single-action pneumatic actuator (22), an external air source is connected into the controller (2) after being filtered and decompressed, an output air path is connected into the rear end of the single-action pneumatic actuator (22) through a redundant double-two-position three-way electromagnetic valve (21), and forward or backward action is executed through the difference between the air pressure of the rear end and the elastic force of a front spring.
9. The temperature measuring device under the severe working condition of claim 2, wherein: the action driver (1) is a double-acting pneumatic actuator (23), an external air source is connected to the controller (2) after being filtered and decompressed, then two air paths with pressures of p1 and p2 are formed, a p1 air path is connected to the rear end of the double-acting pneumatic actuator (23) through a redundant double two-position three-way electromagnetic valve (21), a p2 air path is connected to the front end of the double-acting pneumatic actuator (23), and forward or backward action is executed through the difference between the air pressure of the front end and the air pressure of the rear end.
10. The temperature measuring device under the severe working condition of claim 8 or 9, wherein: the redundant double-two-position three-way electromagnetic valve (21) comprises a first electromagnetic valve and a second electromagnetic valve, air source interfaces of the first electromagnetic valve and the second electromagnetic valve are simultaneously connected with an output air path of the controller (2), a common port of the first electromagnetic valve is connected with an exhaust port of the second electromagnetic valve in series, a common port of the second electromagnetic valve is connected with pneumatic actuators (22 and 23), and control ends of the first electromagnetic valve and the second electromagnetic valve are connected with external switch control signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111433222.9A CN114199393A (en) | 2021-11-29 | 2021-11-29 | Temperature measuring device under bad working condition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111433222.9A CN114199393A (en) | 2021-11-29 | 2021-11-29 | Temperature measuring device under bad working condition |
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| CN114199393A true CN114199393A (en) | 2022-03-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114777844A (en) * | 2022-04-28 | 2022-07-22 | 陈松涛 | Fixed bed gasification furnace detection device and fixed bed gasification furnace detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114777844A (en) * | 2022-04-28 | 2022-07-22 | 陈松涛 | Fixed bed gasification furnace detection device and fixed bed gasification furnace detection method |
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