CN107367331A - A kind of continuous measuring device of Ethylene Cracking Furnace Tubes temperature - Google Patents

Abstract

The present invention relates to the field of petrochemical technology, more specifically, to a continuous measuring device for the temperature of an ethylene cracking furnace tube, comprising a control unit, a support frame, a track arranged on the support frame and parallel to the arrangement direction of the cracking furnace mouth, and The movable parts on the track are equipped with position identifiers corresponding to different cracking furnace mouth positions, the movable parts are equipped with a rotary swing worktable, and the rotary swing workbench is equipped with a temperature measuring part; the control unit controls the movable When the component moves to the position of the cracking furnace mouth, the corresponding position recognizer sends a signal to the control unit, and the control unit controls the rotary movement of the rotary swing table so that the temperature measuring component collects the temperature of all furnace tubes in the cracking furnace mouth. The invention has simple structure and convenient operation, can simultaneously complete the continuous measurement of all cracking furnace openings in the whole cracking furnace, eliminates the phenomenon of missed measurement, wrong measurement and repeated measurement caused by manual observation, and ensures the accuracy of furnace tube temperature measurement.

Description

A Continuous Measuring Device for Tube Temperature of Ethylene Cracking Furnace

technical field

The invention relates to the technical field of petrochemical industry, in particular to a continuous measuring device for the temperature of an ethylene cracking furnace tube.

Background technique

In the production process of ethylene, the pyrolysis technology needs to be heated by a tube furnace. In the tube heating production process, the furnace tube of the cracking furnace plays the role of heating the raw material and the reactor, and is a key part of the cracking process. The operating status of the cracking furnace directly affects the ethylene production process. Yield and quality. Because the cracking furnace tube has been subjected to high temperature, corrosion and load for a long time, coking and surface oxidation will occur inside and outside the tube wall of the cracking furnace tube, resulting in the decline of the mechanical properties of the furnace tube, material phase change, erosion thinning, etc. leakage and crack failure. The external manifestation of this failure process is the temperature change of the tube wall.

In order to ensure the normal operation of the furnace tube of the cracking furnace and prevent the failure of the furnace tube wall, the temperature of the furnace tube must be monitored and controlled in real time and accurately, so as to make timely and accurate judgments on the operating status of the furnace tube. The method used is to monitor the cracking furnace The furnace tube wall temperature is used to determine the working condition of the fluid in the furnace tube.

There are two methods for measuring furnace tube wall temperature at present. One method is to install an infrared thermal imager in the furnace. This method can take pictures of leakage and heat preservation efficiency, but it cannot be used for real-time monitoring of the furnace tube surface temperature, so it can only be used as reference data for the tube wall temperature, and there are The price is expensive, the reliability is low, and the maintenance of the instrument can only be carried out during the period of factory shutdown. Another method is manual observation outside the furnace, specifically a manual hand-held infrared thermometer, which is manually positioned and measured tube by tube through the furnace mouth of the cracking furnace. The method is simple, but because the temperature in the furnace is above 800°C, the workers have to face the open furnace mouth during operation. Affected by the strong heat radiation from the furnace, it is difficult for the workers to remove the furnace tube in the furnace mouth once in a short time. After the permanent measurement, it is often divided into several intermittent operations. As a result, missed measurements, false measurements, and repeated measurements often occur, and the reliability and accuracy of the measurement cannot be guaranteed; and manual observation can only measure one cracking furnace at a time. The continuous measurement of all cracking furnace ports in the whole cracking furnace cannot be completed at the same time.

Achieving real-time and accurate measurement of the outer temperature of the furnace tube, and then determining the temperature change in the furnace tube has important practical significance for improving the production capacity of the ethylene cracking furnace, ensuring the safety of production, and improving the working environment for workers.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a continuous measurement device for the furnace tube temperature of an ethylene cracking furnace, which is simple in structure and easy to operate, and can simultaneously complete the continuous measurement of all cracking furnace ports in the entire cracking furnace, eliminating the need for artificial The phenomenon of missed measurement, false measurement and repeated measurement caused by observation ensures the accuracy of furnace tube temperature measurement.

In order to achieve the above object, the technical scheme adopted in the present invention is:

Provided is a continuous measurement device for the furnace tube temperature of an ethylene cracking furnace, including a control unit, a support frame, a track arranged on the support frame and parallel to the arrangement direction of the cracking furnace mouth, and a movable part arranged on the track, which corresponds to different There is a position identifier at the position of the cracking furnace mouth, a rotary swing worktable is set on the movable part, and a temperature measuring part is set on the rotary swing workbench; when the control unit controls the movable part to move to the position of the cracking furnace mouth, the corresponding position The recognizer sends a signal to the control unit, and the control unit controls the rotary movement of the rotary swing worktable so that the temperature measuring part collects the temperature of all furnace tubes in the cracking furnace mouth.

When measuring the temperature of the furnace tube wall, the length of the track can cover all cracking furnace mouths, and the temperature measuring parts are at the same height as the cracking furnace mouths. The temperature component can collect the temperature of all furnace tubes in the cracking furnace mouth during the swing process.

In the above solution, the control unit controls the movable parts to move to the positions of each cracking furnace mouth successively, and the corresponding position identifier sends a signal to the control unit, and the control unit controls the rotary movement of the rotary swing table so that the temperature measuring parts successively collect each When the temperature of all the furnace tubes in the cracking furnace mouth and the movable parts are not located at the position of the cracking furnace mouth, the control unit controls the rotary swing table to stop the rotary motion. The present invention is a continuous measurement device for furnace tube temperature of ethylene cracking furnace, which has simple structure and convenient operation, can simultaneously complete continuous measurement of all cracking furnace openings in the whole cracking furnace, and eliminates missed measurement, false measurement and repeated measurement caused by manual observation. Phenomenon, to ensure the accuracy of furnace tube temperature measurement.

Preferably, the movable part includes an outer casing, a roller and a first driving device; the outer casing is arranged on the roller, and the first driving device is connected with the control unit and used to drive the roller to move along the track; the rotary swing table is arranged on the outer casing superior. The first driving device is a DC biaxial stepping motor, and the number is two, and the number of rollers is four. One DC biaxial stepping motor drives the two rollers to rotate; the control unit controls the operation of the first driving device to drive the rollers along the The track moves, and the moving mode of the roller and the track makes the movable parts move smoothly, so that the measurement work can be carried out smoothly.

Preferably, the outer casing is provided with an anti-overturning device for preventing the movable part from being overturned during the moving process. This arrangement prevents the movable parts from being overturned due to accidents during the moving process, and can prevent damage caused by the movable parts, the rotary swing table and the temperature measuring parts falling from the track during the overturning. Further preferably, the anti-overturning device is a limit stop embedded in the track, and the limit stop slides along the track when the movable component moves. The limit stoppers are two and are symmetrically embedded on both sides of the track respectively, so that the anti-overturn device will not hinder the movement of the movable parts, so that the movable parts can move smoothly along the track without overturning.

Preferably, the outer casing is provided with a dust removal device, which is used to remove floating dust and obstacles on the track during the moving process of the movable part. There are two dust removal devices and they are respectively arranged on the front and rear sides of the outer shell. The front side of the outer shell is the moving direction of the movable parts. During the movement, the removal of floating dust and obstacles can ensure the smooth movement of the movable parts, which is beneficial to the temperature measurement work. went well. Further preferably, the dust removal device is a dust removal brush, and the dust removal brush is in contact with the track without gaps. The dust removal brush is in close contact with the track, which can ensure the cleanliness of floating dust and obstacle cleaning.

Preferably, a temperature-resistant anti-slip sleeve is provided at the position where the roller contacts the track. The heat-resistant anti-slip sleeve is a heat-resistant anti-slip rubber sleeve to ensure that there is no sliding friction contact between the roller and the track.

Preferably, the position identifier includes a magnetic iron block buried on the track and a protective device, and the protective device is used to protect the magnetic iron block; when the control unit controls the movable part to move to the position of the cracking furnace mouth, the magnetic iron block sends a signal to the control unit . When the movable parts move to each cracking furnace mouth one after another, the corresponding magnetic iron block sends a signal to the control unit, and the control unit controls the rotary swing table to make a rotary motion, so that the temperature measuring part successively collects all furnaces in each cracking furnace mouth. tube temperature.

Preferably, the rotary swing table includes a platform, a second driving device arranged on the platform and connected to the control unit, a swing guide mechanism or a crank rocker mechanism arranged on the platform, and the temperature measuring component is arranged on the swing guide rod mechanism or crank rocker mechanism; the second driving device drives the swing guide rod mechanism or the crank rocker mechanism to perform swinging motion so that the temperature measuring component collects the temperature of all furnace tubes in the cracking furnace mouth. The second driving device drives the oscillating guide rod mechanism or the crank-rocker mechanism to perform oscillating motion, thereby causing the temperature measuring component to perform oscillating motion. During the oscillating process, the temperature measuring component can collect the temperature data of all furnace tubes in the cracking furnace mouth.

Preferably, the temperature measuring components include an infrared thermometer and an infrared range finder. The infrared thermometer can measure the temperature of the furnace tube wall and record it in the memory chip. The distance sensor can measure the distance and orientation between the furnace tube wall and the measuring parts. Multiple furnace tubes can be observed in one cracking furnace mouth. At the same time, the observer can judge and identify different tube walls according to the measured distance and azimuth, so as to prevent the recorded furnace tube wall temperature from not corresponding to the furnace tube, so as to ensure the accuracy of temperature measurement.

Compared with prior art, the beneficial effect of the present invention is:

The present invention is a continuous measuring device for the furnace tube temperature of an ethylene cracking furnace. The control unit controls the movable parts to move to the position of each cracking furnace mouth successively, and the corresponding position identifier sends a signal to the control unit, and the control unit controls the rotary swing workbench. The rotary movement makes the temperature measuring part successively collect the temperature of all the furnace tubes in each cracking furnace mouth, and when the movable part is not located at the position of the cracking furnace mouth, the control unit controls the rotary swing table to stop the rotary motion. The structure of the invention is simple and the operation Convenient, can complete the continuous measurement of all cracking furnace mouths in the whole cracking furnace at the same time, eliminate the phenomenon of missed measurement, false measurement and repeated measurement caused by manual observation, and ensure the accuracy of furnace tube temperature measurement; The anti-overturning device that prevents the overturning of the movable parts during the moving process prevents the overturning of the movable parts due to accidents during the moving process, and prevents the movable parts, the rotary swing table and the temperature measuring parts from falling off the track during overturning Damage caused by dust removal; by installing a dust removal device on the outer shell, the dust removal device is used to remove floating dust and obstacles on the track during the moving process of the movable parts. The temperature measurement work was carried out smoothly.

Description of drawings

Fig. 1 is the front view of a continuous measuring device for the furnace tube temperature of an ethylene cracking furnace in this embodiment.

Fig. 2 is a side view of a continuous measurement device for furnace tube temperature of an ethylene cracking furnace in this embodiment.

Fig. 3 is a schematic diagram of a rotary swing table including a swing guide mechanism.

Fig. 4 is a schematic diagram of a rotary swing table including a crank rocker mechanism.

detailed description

The present invention will be further described below in combination with specific embodiments. Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific Orientation structure and operation, therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes, and should not be construed as limitations on this patent. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

Example

The schematic diagram of the continuous measuring device of a kind of ethylene cracking furnace tube temperature of the present embodiment is as shown in Fig. 1 to Fig. 2, comprises control unit, support frame 7, is located on the support frame 7 and parallel with cracking furnace port 4 arrangement direction Track 6, the movable part 3 arranged on the track 6, a position identifier 5 is provided on the track 6 corresponding to the positions of different cracking furnace mouths 4, the movable part 3 is provided with a rotary swing table 10, and the rotary swing table 10 There is a temperature measuring part 11 on it; when the control unit controls the movable part 3 to move to the position of the cracking furnace mouth 4, the corresponding position identifier 5 sends a signal to the control unit, and the control unit controls the rotary motion of the rotary swing table 10 to measure the temperature Part 11 collects the temperature of all furnace tubes 2 in the cracking furnace mouth 4 .

When measuring the wall temperature of the furnace tube 2, the continuous measuring device is installed near the cracking furnace 1, and the length of the track 6 can cover all the cracking furnace mouths 4, the temperature measuring part 11 is at the same height as the cracking furnace mouth 4, and the rotary swing table 10. The center of swing when swinging is set at the position near the center of the cracking furnace mouth 4, so that the temperature measuring part 11 can collect the temperature of all furnace tubes 2 in the cracking furnace mouth 4 during the swing process.

When the continuous measuring device is used to measure the wall temperature of the furnace tube 2, the control unit controls the movable part 3 to move to the position of the first cracking furnace mouth 4, and the first position identifier 5 corresponding to the first cracking furnace mouth 4 The control unit sends a signal, and the control unit controls the rotary movement of the rotary swing table 10 so that the temperature measuring component 11 collects the temperature of all furnace tubes 2 in the first cracking furnace mouth 4. After the collection is completed, the control unit controls the rotary swing table 10 to stop Rotate motion and control movable part 3 to move to the second cracking furnace mouth 4 positions, repeat above-mentioned operation subsequently, so that this continuous measuring device can gather the temperature of all furnace tubes 2 in each cracking furnace mouth 4 successively; When the moving part 3 is not at the position of the cracking furnace mouth 4, the control unit controls the rotary swing table 10 to stop the rotary motion, that is, the control unit controls the rotary swing table 10 to perform intermittent rotary swing motion. The present invention is a continuous measuring device for the furnace tube temperature of an ethylene cracking furnace, which has a simple structure and is easy to operate, and can simultaneously complete the continuous measurement of all cracking furnace ports 4 in the entire cracking furnace 1, eliminating missed measurements, mismeasured measurements, and errors caused by manual observation. Repeat the measurement phenomenon to ensure the accuracy of the temperature measurement of the furnace tube.

Wherein, the movable part 3 includes an outer casing, a roller 9 and a first driving device 12; the outer casing is arranged on the roller 9, and the first driving device 12 is connected with the control unit and used to drive the roller 9 to move along the track 6; The workbench 10 is arranged on the outer casing. The first driving device 12 is a DC biaxial stepping motor, and the number is two, and the number of rollers 9 is four. A DC biaxial stepping motor drives two rollers 9 to rotate; the control unit controls the first driving device 12 to work Drive the roller 9 to move along the rail 6, and the moving mode of the roller 9 cooperating with the rail 6 enables the movable part 3 to move smoothly, so that the measurement work can be carried out smoothly.

In addition, the outer casing is provided with an anti-overturning device 14 for preventing the movable part 3 from overturning during movement. This arrangement makes the movable part 3 not overturned due to accidents during the moving process, and can prevent the movable part 3, the rotary swing table 10 and the temperature measuring part 11 from falling off from the track 6 when being overturned. In this embodiment, the anti-overturning device 14 is a limit block embedded in the track 6 , and the limit block slides along the track 6 when the movable part 3 moves. The limit stops are two and are respectively embedded symmetrically on both sides of the track 6, so that the anti-overturning device 14 will not hinder the movement of the movable part 3, so that the movable part 3 can move along the track 6 while not overturning. Move smoothly.

Wherein, the outer casing is provided with a dust removal device 8 for removing floating dust and obstacles on the track 6 during the moving process of the movable part 3 . The dust removal device 8 is two and is respectively arranged on the front and rear sides of the outer casing. The front side of the outer casing is the moving direction of the movable part 3. During the movement, removing floating dust and obstacles can ensure the smooth movement of the movable part 3, which is beneficial to the measurement. Wen's work is going smoothly. In this embodiment, the dust removal device 8 is a dust removal brush, and the dust removal brush is in contact with the track 6 without gaps. The dust removal brush is in close contact with the track 6, which can ensure the cleanliness of floating dust and obstacle cleaning.

In addition, a temperature-resistant anti-slip sleeve 13 is provided at the position where the roller 9 contacts the track 6 . The temperature-resistant anti-skid cover 13 is a temperature-resistant anti-skid rubber cover to ensure that there is no sliding friction contact between the roller 9 and the track 6 .

Wherein, the position identifier 5 includes a magnetic iron block and a protective device embedded in the track 6, and the protective device is used to protect the magnetic iron block; The unit sends a signal. When the movable part 3 moves to each pyrolysis furnace mouth 4 successively, the corresponding magnetic iron block sends a signal to the control unit, and the control unit controls the rotary swing table 10 to make a rotary motion, so that the temperature measuring part 11 successively collects each pyrolysis furnace mouth. The temperature of all furnace tubes 2 in the furnace mouth 4.

In addition, there are two types of rotary swing table 10 in this embodiment. The first type is shown in FIG. And the swing guide rod mechanism 15 that is connected with the control unit, the temperature measuring part 11 is arranged on the swing guide rod mechanism 15, and the second driving device drives the swing guide rod mechanism 15 to perform swinging motion so that the temperature measuring part 11 collects the pyrolysis furnace mouth 4 The temperature of all furnace tubes 2; when the position identifier 5 sends a signal to the control unit, the control unit controls the second drive device to drive the swing guide rod mechanism 15 to perform a swing movement, thereby causing the temperature measuring component 11 to perform a swing movement, during the swing process The temperature measuring component 11 can collect the temperature data of all the furnace tubes 2 in the cracking furnace mouth 4 . The rotary swing table 10 of the second form, as shown in Figure 4, comprises a platform, a second driving device arranged on the platform, a crank rocker mechanism 16 arranged on the platform and connected with the control unit, and a temperature measuring component 11 is provided. On the crank-rocker mechanism 16, the second driving device drives the crank-rocker mechanism 16 to perform a swinging motion so that the temperature measuring part 11 collects the temperature of all furnace tubes 2 in the cracking furnace mouth 4; when the position identifier 5 sends a signal to the control unit Finally, the control unit controls the second driving device to drive the crank and rocker mechanism 16 to perform a swinging motion, thereby causing the temperature measuring component 11 to perform a swinging motion. temperature data.

Wherein, the temperature measuring component 5 includes an infrared thermometer and an infrared range finder. The infrared thermometer can measure the wall temperature of the furnace tube 2 and record it in the memory chip. The distance sensor can measure the distance and the orientation between the wall of the furnace tube 2 and the measuring part 11. Multiple cracking furnace mouths 4 can be observed. At this time, the observer can judge and identify different tube walls according to the measured distance and orientation, so as to prevent the recorded furnace tube wall temperature from not corresponding to the furnace tube 2, so as to ensure the accuracy of temperature measurement.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A continuous measuring device for the furnace tube temperature of an ethylene cracking furnace, characterized in that it comprises a control unit, a support frame (7), a track that is arranged on the support frame (7) and is parallel to the arrangement direction of the cracking furnace mouth (4) (6), the movable part (3) arranged on the track (6), the track (6) is equipped with a position identifier (5) corresponding to the position of different pyrolysis furnace mouths (4), and the movable part (3) A rotary swing table (10) is provided, and a temperature measuring part (11) is arranged on the rotary swing table (10); when the control unit controls the movable part (3) to move to the position of the cracking furnace mouth (4), the corresponding position The identifier (5) sends a signal to the control unit, and the control unit controls the rotary movement of the rotary swing table (10) so that the temperature measuring component (11) collects the temperature of all furnace tubes (2) in the cracking furnace mouth (4). 2. A device for continuously measuring the temperature of an ethylene cracking furnace tube according to claim 1, wherein the movable part (3) includes an outer casing, a roller (9) and a first driving device (12) The outer casing is arranged on the roller (9), and the first driving device (12) is connected with the control unit and used to drive the roller (9) to move along the track (6); the rotary swing table (10) is arranged on the outer casing. 3. A continuous measurement device for the furnace tube temperature of an ethylene cracking furnace according to claim 2, characterized in that the outer casing is provided with an anti-subversion device ( 14). 4. A continuous measuring device for the temperature of an ethylene cracking furnace tube according to claim 3, characterized in that the anti-overturn device (14) is a limit block embedded in the track (6), and the movable part (3) The limit stopper slides along the track (6) when moving. 5. A continuous measuring device for the temperature of a furnace tube of an ethylene cracking furnace according to claim 2, characterized in that, the outer casing is provided with a dust removal device (8), and the dust removal device (8) is used for moving parts (3) Clear the floating dust and obstacles on the track (6) during the movement. 6 . The device for continuously measuring the tube temperature of an ethylene cracking furnace according to claim 5 , wherein the dust removal device ( 8 ) is a dust removal brush, and the dust removal brush contacts the track ( 6 ) without gaps. 7. A device for continuously measuring the temperature of an ethylene cracking furnace tube according to claim 2, characterized in that a temperature-resistant anti-slip sleeve (13) is provided at the position where the roller (9) contacts the track (6). 8. A continuous measurement device for the temperature of an ethylene cracking furnace tube according to claim 1, characterized in that the position identifier (5) includes a magnetic iron block and a protection device embedded on the track (6), and the protection device It is used to protect the magnetic iron block; when the control unit controls the movable part (3) to move to the cracking furnace mouth (4), the magnetic iron block sends a signal to the control unit. 9. A continuous measuring device for the temperature of an ethylene cracking furnace tube according to claim 1, characterized in that, the rotary swing table (10) includes a platform, and a second The driving device is arranged on the swing guide mechanism (15) or the crank rocker mechanism (16) on the platform, and the temperature measuring component (11) is arranged on the swing guide mechanism (15) or the crank rocker mechanism (16); The second driving device drives the swing guide mechanism (15) or the crank rocker mechanism (16) to perform swing movement so that the temperature measuring component (11) collects the temperature of all furnace tubes (2) in the cracking furnace mouth (4). 10. A device for continuously measuring the temperature of an ethylene cracking furnace tube according to any one of claims 1 to 9, characterized in that the temperature measuring component (5) includes an infrared thermometer and an infrared range finder.