A Measuring System and Method for the Surface Temperature of a Furnace Body

Abstract

The present invention discloses a measurement system and a measurement method for the surface temperature of a furnace body. The measurement system for the surface temperature of the furnace body includes an infrared thermal imager assembly disposed on the outer surface of the furnace body to be measured; the furnace body to be measured includes a vault and a straight section of the cylinder body; the infrared thermal imager assembly includes a first infrared thermal imager group distributed above the vault and a second infrared thermal imager group circumferentially distributed along the horizontal direction on the straight section of the cylinder body; the second infrared thermal imager group includes an A layer arranged in parallel, with B infrared thermal imagers in each layer; A is [value of A], B is [value of B]. In the second infrared thermal imager group, the distance between each infrared thermal imager and the outer surface of the furnace body to be measured is L; the relationship between L and D satisfies the formula: 0.5D ≤ L ≤ 5D. The measurement system for the surface temperature of the present invention has a simple structure and is convenient to operate, and can accurately obtain the temperature distribution on the surface of the furnace body.

Description

Technical Field

[0001] The present invention relates to a measurement system and a measurement method for the surface temperature of a furnace body. Background Art

[0002] Coal gasification technology is one of the key technologies for the clean and efficient utilization of carbonaceous substances such as coal today. It is the main way to convert primary energy into clean secondary energy and chemical products. This technology is mainly applied in industries such as synthetic ammonia, synthetic methanol, refinery hydrogen production, blast furnace reduction ironmaking, chemical metallurgy, and combined cycle power generation units. The development of coal gasification technology has gone through fixed-bed gasification technology (represented by Lurgi technology and Saiding gasification technology), fluidized-bed gasification technology (represented by HTW and Ugas technology), and entrained-flow gasification technology (represented by Texaco, Shell, multi-nozzle, HT-L, and SE technology). With the technical requirements for large-scale energy security, cleanliness, and efficient conversion, entrained-flow coal gasification technology with characteristics such as high gasification temperature and pressure, large load, and wide coal type adaptability has become the main direction of the development and industrial application of coal gasification technology. The water slurry refractory lining gasification technology is widely used in the coal chemical industry due to its advantages such as short process flow, simple gasifier structure, small heat loss, and high chemical energy conversion rate. Its share in China's modern coal gasification technology is about 65%. Realizing the monitoring of the overall state of the gasifier and the thickness of the refractory brick is the key to the operation of the gasifier.

[0003] At present, the monitoring parameters of the gasifier mainly include the gasifier pressure, the temperature inside the gasifier, and the surface temperature of the gasifier. Among them, the gasifier pressure is measured by the nitrogen blowing method, the temperature inside the gasifier is measured by a high-temperature thermocouple, and the surface temperature of the gasifier is measured by a surface thermocouple. Among them, when measuring the temperature inside the gasifier, the high-temperature thermocouple has a short service life due to reasons such as slag erosion and high-temperature ablation inside the furnace; on the other hand, due to the limitations of the high-pressure environment and measurement cost, the number of measurement points is only 3 - 6, and the measurement structure is not accurate enough. When measuring the surface temperature of the gasifier, the thermocouple on the surface of the gasifier is a linear thermocouple, which can only measure the highest temperature value of the wall surface in contact with it. Therefore, the monitoring data is limited; in addition, it has certain limitations, such as being affected by installation accuracy, surface roughness, etc., resulting in certain defects in measurement accuracy and precision.

[0004] Therefore, there is an urgent need in engineering to develop a more durable, less affected by external factors, wide applicable range, and accurate measurement result monitoring device and method for the wall temperature of the gasifier. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art such as inaccurate measurement results of the surface temperature of the gasifier, large influence of external factors, and short service life, and to provide a measurement system and method for the surface temperature of the furnace body. The measurement system for the surface temperature of the furnace body of the present invention has a simple structure and convenient operation, and can accurately obtain the temperature distribution on the surface of the furnace body.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A measurement system for the surface temperature of a furnace body, which includes an infrared thermal imager assembly arranged on the outer surface of the furnace body to be measured;

[0008] The furnace body to be measured includes a vault and a straight section of the cylinder;

[0009] The infrared thermal imager assembly includes a first infrared thermal imager group distributed above the vault, and a second infrared thermal imager group circumferentially distributed along the horizontal direction on the straight section of the cylinder;

[0010] The second infrared thermal imager group includes layer A arranged in parallel, and B infrared thermal imagers in each layer;

[0011] The number of layers of A is an integer calculated by the formula ;

[0012] The number of B is an integer calculated by the formula ;

[0013] Wherein, D is the outer diameter of the straight section of the cylinder, H is the height of the straight section of the cylinder, and a is the viewing angle of the infrared thermal imager;

[0014] In the second infrared thermal imager group, the distance between each infrared thermal imager and the outer surface of the furnace body to be measured is L, and L is the value obtained by subtracting the radius of the furnace body to be measured from the vertical distance from each infrared thermal imager to the central axis of the furnace body to be measured;

[0015] The relationship between L and D satisfies the formula: 0.5D ≤ L ≤ 5D.

[0016] In the present invention, the furnace body to be measured can be a furnace body in the prior art that needs to measure the surface temperature distribution, and can be a gasifier. The gasifier is, for example, a multi-nozzle water coal slurry gasifier.

[0017] In the present invention, the material of the wall surface of the furnace body to be measured can be metal and / or concrete, preferably metal.

[0018] In the present invention, the circumferential distribution can have the meaning conventionally understood in the art, generally referring to the circumferential direction around the periphery of the furnace body to be measured, that is, the horizontal circumferential direction of the outer surface of the straight section of the cylinder.

[0019] In the present invention, in the second infrared thermal imager group, the number of layers of the set A layer is preferably more than 2, more preferably 2 - 5, for example 3 or 4.

[0020] In the present invention, in the second infrared thermal imager group, each of the infrared thermal imagers is placed at equal intervals. The equal interval placement generally means that between layers, the intervals are equal, and in each layer, each of the infrared thermal imagers is placed at equal intervals.

[0021] In the present invention, the number of B is preferably more than 1, for example 2 or 3.

[0022] In the present invention, in the second infrared thermal imager group, the total number of the set infrared thermal imagers is the value of A multiplied by B.

[0023] In the present invention, those skilled in the art know that the value calculated according to the formula of A or B is a non-integer, and generally, the rounding method is used to take an integer.

[0024] In the present invention, between L and D, they preferably satisfy the relational expression: D ≤ L ≤ 3D, for example L = 2D.

[0025] In the present invention, those skilled in the art know that L generally refers to the shortest straight-line distance between each of the infrared thermal imagers in the second infrared thermal imager group and the straight section of the cylinder.

[0026] In the present invention, the distance between the infrared thermal imager above the vault and the highest point of the vault is preferably L.

[0027] In the present invention, above the vault, the number of the infrared thermal imagers can be 1 - 3, for example 2.

[0028] In the present invention, for the position above the vault, the position of the infrared thermal imager is generally set considering the influence of the large curved surface on the measurement accuracy.

[0029] For example, when the number of the infrared thermal imagers above the vault is 1, above the vault is preferably the position corresponding to the axial direction of the vault center.

[0030] For example, when the number of the infrared thermal imagers above the vault is 2, the infrared thermal imagers are preferably evenly distributed above the vault.

[0031] In the present invention, the viewing angle of the infrared thermal imager can have the meaning commonly understood in the art, generally referring to the angle between the surface of the sensor on the infrared thermal imager and the center of the lens.

[0032] In the present invention, the viewing angle a is preferably 20 to 84°, such as 30°, 50° or 60°. The viewing angle is generally changed by the distance between the lens and the sensor in the infrared thermal imager.

[0033] In the present invention, the measurement system for the surface temperature of the furnace body preferably further includes a data processing module, a data transmission module and a data imaging module. The data transmission module is used to transmit the surface temperature distribution of the furnace body to be measured obtained by the data processing module to the data imaging module.

[0034] Among them, the data processing module includes a data field of view correction module and an infrared radiation intensity and temperature data conversion module, which are used to correct the temperature distribution measured by the measurement system for the surface temperature of the furnace body. Preferably, the correction method is to correct according to the resolution and spatial dimensions.

[0035] Among them, the data transmission module is preferably a cable.

[0036] Among them, the data imaging module preferably includes a DSC system. The data imaging module is used to display the real-time temperature distribution obtained in the data processing module.

[0037] In the present invention, by arranging a specific number and position of infrared thermal imagers above the crown of the furnace body to be measured and circumferentially distributed on the straight section of the cylinder body, the measurement of the surface temperature distribution of the furnace body in the projection viewing area is realized. In the present invention, the surface temperature distribution obtained by each infrared thermal imager is corrected according to the resolution and spatial dimensions to obtain the overall temperature distribution of the surface of the furnace body to be measured. The corrected temperature distribution is fed back to the DCS system through data transmission to display the wall surface temperature distribution in real time.

[0038] The present invention also provides a method for measuring the surface temperature of a furnace body, which uses the measurement system for the surface temperature of the furnace body for measurement.

[0039] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0040] The positive and progressive effects of the present invention are as follows:

[0041] In the present invention, by arranging an infrared thermal imager above the crown of the furnace body and evenly distributing a specific number of infrared thermal imagers circumferentially on the straight section of the cylinder body, the overall temperature distribution of the surface of the furnace body can be accurately obtained, and the device has a simple structure and is convenient to operate. Description of the Drawings

[0042] Figure 1 Front view of the measuring system for the surface temperature of the gasifier in Example 1.

[0043] Figure 2 Top view of the measuring system for the surface temperature of the gasifier in Example 1.

[0044] Figure 3 Temperature distribution diagram measured by the measuring system for the surface temperature of the gasifier in Example 1.

[0045] Reference numerals:

[0046] 1 - Furnace body to be measured; 2 - Wall surface of the furnace body to be measured; 3 - Infrared thermal imager; 4 - Vault; 5 - Straight section of the cylinder. Detailed implementation manners

[0047] The present invention will be further described below by way of examples, but the present invention is not limited to the scope of the described examples. For the experimental methods without specific conditions noted in the following examples, they are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0048] Example 1

[0049] As Figure 1 shown, it is the front view of the measuring system for the surface temperature of the gasifier in this example. As Figure 2 shown, it is the top view of the measuring system for the surface temperature of the gasifier in this example.

[0050] This example provides a measuring system for the surface temperature of a furnace body, which includes a furnace body 1 to be measured and an infrared thermal imager assembly arranged on the outer surface of the furnace body 1 to be measured. The furnace body 1 to be measured is a multi-nozzle water coal slurry gasifier with a daily coal treatment capacity of 1500 tons, and gasification is carried out with water coal slurry as the raw material; the gasification pressure is 6.5 MPa, and the refractory lining is refractory bricks.

[0051] The furnace body 1 to be measured includes a vault 4 and a straight section 5 of the cylinder, and the wall surface 2 of the furnace body to be measured is made of metal. Among them, the height H of the straight section of the cylinder is 9 m, the outer diameter D of the straight section of the cylinder is 3.4 m, the height of the straight section above the nozzle is 3 m, and the lower height is 6 m; the gasification temperature is 1300 °C. Taking typical Shenhua bituminous coal as the raw material.

[0052] The infrared thermal imager assembly includes a first infrared thermal imager group distributed above the vault and a second infrared thermal imager group circumferentially distributed along the horizontal direction on the straight section of the cylinder;

[0053] The first infrared thermal imager group is provided with 1 infrared thermal imager 3 directly above the vault;

[0054] The second infrared thermal imager group is arranged in parallel for 3 layers (3 layers are based on the formula (obtained by rounding after calculation), there are 3 (according to (obtained by rounding after calculation) infrared thermal imagers 3, a total of 10 infrared thermal imagers. The layers are arranged at equal intervals between layers, and each infrared thermal imager in each layer is arranged at equal intervals. The viewing angle a of the infrared thermal imager is 50°. In the second group of infrared thermal imagers, the distance between the infrared thermal imager 3 and the outer surface of the furnace body to be measured is L (L = D), and L is the value obtained by subtracting the radius of the furnace body to be measured from the vertical distance between the infrared thermal imager and the central axis of the furnace body to be measured. The infrared thermal imager selects a camera with 382*288 pixels and obtains a temperature distribution at a resolution of 120mm 2 to achieve accurate temperature measurement.

[0055] Such as Figure 3 shown is the surface temperature distribution map of the gasifier in the embodiment measured by the above-mentioned measurement system for the surface temperature of the gasifier. This temperature distribution is obtained from the two-dimensional temperature contour map obtained from the infrared thermal imager and then based on the on-site coordinates photographed by the camera. According to Figure 3 it can be seen that the method of the embodiment of the present invention realizes the monitoring of the temperature distribution on the surface of the gasifier. Figure 3 The left data column in is the temperature scale, and the right side shows the temperature measurement values.

[0056] The measurement system for the surface temperature of the gasifier in this embodiment further includes a data processing module, a data transmission module, and a data imaging module. The data transmission module is used to transmit the surface temperature distribution of the furnace body to be measured obtained by the data processing module to the data imaging module. The data processing module is used to correct the temperature distribution obtained by the temperature measurement system, and it includes a data field of view correction module and an infrared radiation intensity and temperature data conversion module. The data transmission module is a cable, and the data imaging module includes a DSC system, which is used to display the real-time temperature distribution obtained by the data processing module. The surface temperature distribution obtained by each infrared thermal imager is corrected according to the resolution and spatial dimensions to obtain the overall temperature distribution on the surface of the furnace body to be measured. The corrected temperature distribution is fed back to the DCS system through data transmission to display the wall surface temperature distribution in real time.

[0057] The parameters such as the coal consumption of the gasifier, the installation position and number of infrared thermal imagers in Examples 2 to 5 are shown in Table 1 below. In Example 4, the 2 infrared thermal imagers above the arch top are evenly distributed above the arch top according to the large curved surface measurement principle. The remaining settings of the measurement system for the surface temperature of the furnace body in Examples 2 to 5 are the same as those in Example 1.

[0058] Table 1

[0059]

[0060]

[0061] Note: The total number of infrared thermal imagers = the number of layers * the number of each layer + the number of vaults

[0062] It can be seen from the data in Table 1 that the present invention determines the number of infrared thermal imagers arranged outside the gasifier by setting the height and outer diameter of the straight section of the cylinder in the gasifier, the distance between the infrared thermal imager and the gasifier, the degree of the viewing angle, and the relationship between L and D, thereby realizing accurate measurement of the temperature distribution on the surface of the water coal slurry gasifier.

Claims

1. A measurement system for the surface temperature of a furnace body, characterized in that, It includes an infrared thermal imager assembly disposed on the outer surface of the furnace body to be measured; The furnace body to be measured includes a vault and a straight section of the cylinder; The infrared thermal imager assembly includes a first infrared thermal imager group distributed above the vault and a second infrared thermal imager group circumferentially distributed along the horizontal direction on the straight section of the cylinder; The second infrared thermal imager group includes A layers arranged in parallel, with B infrared thermal imagers in each layer; The number of layers of the A layer is an integer obtained by the formula calculated; The number of Bs is an integer obtained by calculating according to the formula ; Wherein, D is the outer diameter of the straight section of the cylinder, H is the height of the straight section of the cylinder, and a is the viewing angle of the infrared thermal imager; In the second infrared thermal imager group, the distance between each infrared thermal imager and the outer surface of the furnace body to be measured is L, and L is the value obtained by subtracting the radius of the furnace body to be measured from the vertical distance from each infrared thermal imager to the central axis of the furnace body to be measured; The relationship between L and D satisfies the formula: 0.5D ≤ L ≤ 5D.

2. The measurement system for the surface temperature of the furnace body according to claim 1, wherein The furnace body to be measured is a gasifier; And / or, the material of the wall surface of the furnace body to be measured is metal and / or concrete.

3. The measurement system for the surface temperature of the furnace body according to claim 2, characterized in that, The furnace body to be measured is a multi-nozzle water slurry gasifier.

4. The measurement system for the surface temperature of the furnace body according to claim 1, characterized in that, The number of layers of the A layer is more than 2 layers; And / or, in the second infrared thermal imager group, each infrared thermal imager is placed at equal intervals.

5. The measurement system for the surface temperature of the furnace body according to claim 4, wherein, The number of layers of the A layer is 2 to 5 layers.

6. The measurement system for the surface temperature of the furnace body according to claim 5, characterized in that, The number of layers of the A layer is 3 layers or 4 layers.

7. The measurement system for the surface temperature of the furnace body according to claim 1, characterized in that, The number of B is more than 1.

8. The measurement system for the surface temperature of the furnace body according to claim 7, characterized in that, The number of B is 2 or 3.

9. The measurement system for the surface temperature of the furnace body according to claim 1, characterized in that, a is 20 to 84°, and a refers to the angle between the surface of the sensor on the infrared thermal imager and the center of the lens; And / or, the total number of the second infrared thermal imager group is the value of A multiplied by B.

10. The measurement system for the surface temperature of the furnace body according to claim 9, characterized in that, a is 30°, 50° or 60°.

11. The measurement system for the surface temperature of the furnace body according to any one of claims 1-10, characterized in that, The relationship between L and D satisfies the formula: D ≤ L ≤ 3D.

12. The measurement system for the surface temperature of the furnace body according to claim 11, characterized in that, The relationship between L and D satisfies the formula: L = 2D.

13. The measurement system for the surface temperature of the furnace body according to claim 1, characterized in that, The distance between the infrared thermal imager above the vault and the highest point of the vault is L; And / or, above the vault, the number of infrared thermal imagers is 1 to 3.

14. The measurement system for the surface temperature of the furnace body according to claim 13, characterized in that, Above the vault, the number of infrared thermal imagers is 2.

15. The measurement system for the surface temperature of the furnace body according to claim 13, characterized in that, When the number of infrared thermal imagers above the vault is 1, the above of the vault refers to the above corresponding to the axial direction of the vault center.

16. The measurement system for the surface temperature of the furnace body according to claim 13, characterized in that, When the number of infrared thermal imagers above the vault is 2, they are evenly distributed above the vault.

17. The measurement system for the surface temperature of the furnace body according to any one of claims 1-10, characterized in that, The measurement system for the surface temperature of the furnace body further includes a data processing module, a data transmission module, and a data imaging module; the data transmission module is used to transmit the surface temperature distribution of the furnace body to be measured obtained by the data processing module to the data imaging module.

18. The measurement system for the surface temperature of the furnace body according to claim 17, characterized in that, The data processing module includes a data field correction module and an infrared radiation intensity and temperature data conversion module; And / or, the data transmission module is a cable; And / or, the data imaging module includes a DSC system for displaying the real-time temperature distribution obtained in the data processing module.

19. A method for measuring the surface temperature of a furnace body, characterized in that, It is measured by using the measurement system for the surface temperature of the furnace body as described in any one of claims 1-18.

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