Method for testing wear of rotary calciner seals

Abstract

The embodiment of the present application provides a kind of rotary calcining furnace seal wear test method.Therein, rotary calcining furnace includes furnace body and seal, seal is sealingly sleeved in the both ends of furnace body so that furnace body is sealed, furnace body is rotatable relative to seal.Wear test method includes: starting rotary calcining furnace, control furnace body continues to rotate;The pressure in furnace body is adjusted to negative pressure state;Nitrogen is filled into furnace body and carries out leakage test, determines the leakage amount of seal under normal temperature operation;After heating furnace body to working temperature, simulated waste liquid is transported into furnace body to simulate the wear of seal when rotary calcining furnace actually operates;Leakage test is carried out during the simulated operation of rotary calcining furnace, and the leakage amount of seal during simulated operation is determined.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of radioactive waste treatment, and in particular to a method for testing wear of a rotary calciner seal. BACKGROUND

[0002] When radioactive liquid waste is treated using hot crucible or cold crucible glass solidification technology, the rotary calciner is used to calcine the radioactive liquid waste first. The rotary calciner has the characteristics of simple operation and large processing capacity, and can remove water and most of the nitrate in the waste liquid through evaporation and calcination process before it enters the hot crucible or cold crucible, and convert it into solid particles, thereby slowing down the subsequent problems of pressure fluctuation and melting time extension in the hot crucible or cold crucible.

[0003] When the rotary calciner is used to calcine the radioactive liquid waste, the furnace is in a negative pressure state, and a seal is needed at both ends of the furnace body to enable the furnace body to be sealed while rotating. However, in actual operation, as the working time is prolonged, the seal will be worn and the sealing performance of the furnace body will be reduced, resulting in fluctuations in the negative pressure in the calciner, affecting the process operation. Therefore, it is necessary to study the wear of the seal. SUMMARY

[0004] In view of the above problems, embodiments of the present application provide a method for testing wear of a rotary calciner seal. The rotary calciner includes a furnace body and a seal, the seal is sealingly sleeved on both ends of the furnace body to seal the furnace body, and the furnace body is rotatable relative to the seal. The wear test method includes: starting the rotary calciner and controlling the furnace body to rotate continuously; adjusting the pressure in the furnace body to a negative pressure state; filling nitrogen into the furnace body and performing a leakage test to determine the leakage amount of the seal under normal temperature operation; after heating the furnace body to the working temperature, delivering simulated waste liquid into the furnace body to simulate the wear of the seal during actual operation of the rotary calciner; and performing a leakage test during the simulated operation of the rotary calciner to determine the leakage amount of the seal during the simulated operation.

[0005] The method provided by the embodiments of the present application determines the leakage of the seal during the actual operation of the rotary calciner by the gas leakage amount of the furnace body under different operating conditions, thereby analyzing and researching the wear and life of the seal during operation, and providing a basis for optimizing the operating parameters of the rotary calciner. BRIEF DESCRIPTION OF DRAWINGS

[0006] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0007] Figure 1 is a flowchart of a wear test method according to an embodiment of the present application;

[0008] Figure 2 is a structural schematic diagram of a rotary calcining furnace according to an embodiment of the present application;

[0009] Figure 3 is a structural schematic diagram of an end portion of a rotary calcining furnace according to an embodiment of the present application;

[0010] Figure 4 is a schematic diagram of the principle of a rotary calcining furnace according to an embodiment of the present application when performing a wear test;

[0011] Figure 5 is a flow schematic diagram of a wear test method according to another embodiment of the present application.

[0012] It should be noted that the accompanying drawings are not necessarily drawn to scale, and that they are merely intended for illustrative purposes. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0014] It should be noted that, unless otherwise defined, technical or scientific terms used in the present application should be understood as their ordinary meanings to those skilled in the art. If the terms “first”, “second”, etc. are used in the whole text, the terms “first”, “second”, etc. are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance, sequence or implicitly indicating the number of the indicated technical features. It should be understood that the terms “first”, “second”, etc. can be interchanged under appropriate circumstances. If “and / or” appears in the whole text, it means that three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B schemes. In addition, in order to facilitate the description, spatial relative terms such as “above”, “below”, “top”, “bottom”, etc. are used only to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings, and it should be understood that it also includes different orientations in use or operation other than the orientation shown in the drawings.

[0015] Embodiments of the present application provide a wear test method for a sealing element of a rotary calcining furnace. In the embodiments, the rotary calcining furnace includes a furnace body and a sealing element, the sealing element sealingly sleeving both ends of the furnace body to seal the furnace body, and the furnace body being rotatable relative to the sealing element. Figure 1A flowchart of a wear test method according to an embodiment of the present application is shown. As shown in Figure 1 the wear test method includes the following steps:

[0016] Step S1, start the rotary calciner, control the furnace body to rotate continuously;

[0017] Step S2, adjust the pressure in the furnace body to a negative pressure state;

[0018] Step S3, fill nitrogen into the furnace body and perform a leakage test to determine the leakage amount of the sealing element under normal temperature operation;

[0019] Step S4, after heating the furnace body to the working temperature, deliver simulated waste liquid into the furnace body to simulate the wear of the sealing element during actual operation of the rotary calciner;

[0020] Step S5, perform a leakage test during the simulated operation of the rotary calciner to determine the leakage amount of the sealing element during simulated operation.

[0021] The method provided by the embodiments of the present application determines the wear and leakage of the sealing element during actual operation of the rotary calciner by the gas leakage amount of the furnace body under different operating conditions, thereby analyzing and researching the wear and service life of the sealing element during operation, and providing a basis for optimizing the operating parameters of the rotary calciner.

[0022] As shown in Figure 2 and Figure 3 , the rotary calciner can include a furnace body 10 and a sealing element 20. The furnace body 10 serves as the main part of the rotary calciner and has a space for processing radioactive waste, which can be radioactive waste liquid. The furnace body 10 is further provided with a heating device outside for heating the furnace body to achieve calcination of the radioactive waste. The two ends of the furnace body 10 are respectively provided with a feeding part 11 and a discharging part 12 which are in communication with the furnace body 10. When calcining the radioactive waste liquid, the radioactive waste liquid is input into the furnace body 10 from the feeding part 11 and contacts the high-temperature inner wall of the furnace body 10, so that the radioactive waste liquid is evaporated and calcined, and the solid product formed by calcination is discharged from the discharging part 12.

[0023] When the rotary calciner is used to calcine radioactive waste liquid, the furnace body 10 needs to be kept rotating so that the radioactive waste liquid input into the furnace body 10 can fully contact with the inner wall of the furnace body, and the efficient calcination of the radioactive waste liquid can be realized. In order to keep the rotating furnace body 10 and the fixed feeding part 11 and discharging part 12 sealed, prevent the gas product generated by calcination from leaking from the connection between the furnace body 10 and the feeding part 11 or the discharging part 12, a sealing element 20 is arranged at both ends of the furnace body 10, the sealing element 20 is sealingly sleeved on both ends of the furnace body 10, and the sealing element 20 is sealingly and fixedly connected with the feeding part 11 or the feeding part 11, so that the sealing of the furnace body 10 is realized. In this embodiment, the sealing element 20 is a dynamic sealing structure of the furnace body 10, and the furnace body 10 can rotate relative to the sealing element 20, so that the rotation of the furnace body 10 can be realized while the sealing element 20 is kept fixed.

[0024] Specifically, as shown in Figure 3 the sealing element 20 can be a cylindrical structure, the inner wall of the cylindrical structure can be inwardly convex to form a plurality of annular sealing structures 21, the adjacent annular sealing structures 21 have a certain spacing, and the plurality of annular sealing structures 21 form a zigzag winding gas path channel with the outer wall of the furnace body 10. The winding gas path channel can slow down the flow of gas, thereby realizing sealing.

[0025] In the wear experiment of the sealing element 20 of the rotary calciner, nitrogen is used for leakage test to determine the leakage amount of the sealing element 20 under normal temperature operation. Specifically, under the normal temperature state, the furnace body rotating mechanism of the rotary calciner is started, and the furnace body 10 is controlled to rotate continuously. At this time, the furnace body 10 rotates relative to the sealing element 20, and the sealing property between the furnace body 10 and the sealing element 20 is lower than that when the furnace body 10 and the sealing element 20 are relatively static. Therefore, the leakage amount of the furnace body under normal temperature operation needs to be measured. Further, the pressure in the furnace body 10 is adjusted to a negative pressure state, so that the filling amount of nitrogen is more, and the leakage amount of the sealing element can be measured by taking the nitrogen concentration as a reference. At the same time, the furnace body 10 is kept in a negative pressure state, for example, a micro-negative pressure state of-600 Pa can be formed in the sealing cavity of the furnace body 10 by using an air extraction device (for example, a fan), so as to simulate the negative pressure state of the rotary calciner under normal working condition. Then, nitrogen is filled into the furnace body 10, and leakage test is performed to determine the leakage amount of the sealing element 20 under normal temperature operation.

[0026] As shown in Figure 4As shown, during the wear test, a nitrogen storage container 40 can be installed outside the furnace body 10. The nitrogen storage container 40 stores nitrogen gas and is connected to the inside of the furnace body 10 to supply nitrogen gas to the furnace body. The leakage of the seal 20 under normal temperature operation can be used as a benchmark for the leakage of the seal 20 under normal temperature operation of the furnace body 10, obtaining the leakage situation before the start of radioactive waste treatment, so as to facilitate subsequent calculation of the leakage situation of the seal 20 during simulated operation and analyze the impact of high temperature and corrosive gas on the wear of the seal 20.

[0027] Furthermore, the leakage rate of seal 20 during simulated operation is determined. Specifically, the furnace body 10 is heated to its operating temperature, and simulated waste liquid is introduced into the furnace body 10 to put the rotary calciner into a simulated operating state, thereby simulating the wear of seal 20 during actual operation of the rotary calciner. In this embodiment, leakage tests are conducted under simulated operation conditions of the rotary calciner to determine the leakage rate of seal 20 during simulated operation. Then, based on the leakage rate of seal 20 under normal operating temperature and the leakage rate of seal 20 during simulated operation, the wear of seal 20 during actual operation of the rotary calciner is analyzed. By simulating the gas leakage rate of furnace body 10 under different operating conditions, the wear of seal 20 during actual operation of the rotary calciner is simulated, providing a basis for optimizing the operating parameters of the rotary calciner and the structure of the seal.

[0028] In this embodiment, the amount of gas leakage is used as the basis for measuring the wear degree of the seal 20. By determining the relationship between the gas leakage and the structure and operating parameters of the rotary calciner, the relationship between the wear degree of the seal 20 and the structure and operating parameters of the rotary calciner can be obtained, thereby optimizing the structure and operating parameters of the rotary calciner. Alternatively, the service life of the seal 20 under predetermined structure and operating parameters of the rotary calciner can be obtained, thereby determining the replacement frequency of the seal 20.

[0029] like Figure 4 As shown, in some embodiments, a sealing sampling hood 30 is provided outside the seal 20, and the seal 20 is located inside the sealing sampling hood 30. Nitrogen gas is introduced into the furnace body 10 and a leak test is performed to determine the leakage amount of the seal 20 under normal temperature operation, including: detecting the nitrogen and oxygen concentrations inside the sealing sampling hood 30 to determine whether the seal 20 is leaking. In this way, although the specific location of the leak cannot be determined, the total leakage rate of the seal 20 can be quickly measured, ensuring that all leaked gas is collected in the sealing sampling hood and no leak point is missed.

[0030] In the present embodiment, in order to collect the nitrogen gas leaked from the furnace body 10, a sealed sampling cover 30 is arranged outside the sealing member 20, the sealing member 20 is covered in the sealed sampling cover 30, a sealed space is formed in the sealed sampling cover 30 to collect the nitrogen gas leaked from the furnace body 10 through the gap between the furnace body 10 and the sealing member 20. The sealed sampling cover 30 is connected with a gas collecting device 50, the gas collecting device 50 is connected with a gas suction device 60, the gas suction device 60 is used to perform gas suction on the sealed sampling cover 30 and the furnace body 10, so as to form a negative pressure in the sealed sampling cover 30 and the furnace body 10, and the gas leaked into the sealed sampling cover 30 is sucked into the gas collecting device 50 for detection.

[0031] The gas collecting device 50 can be provided with a nitrogen concentration detector 71 and an oxygen concentration detector 72 to detect the nitrogen concentration and the oxygen concentration in the gas collecting device 50. In the present embodiment, the values of the nitrogen concentration and the oxygen concentration in the sealed sampling cover 30 are obtained by detecting the values of the nitrogen concentration and the oxygen concentration in the gas collecting device 50. Further, the leakage of the sealing member 20 can be determined according to the changes of the values of the nitrogen concentration and the oxygen concentration in the sealed sampling cover 30.

[0032] In some embodiments, the nitrogen gas is filled into the furnace body 10 and the leakage test is performed to determine the leakage amount of the sealing member 20 under normal temperature operation, and the method further comprises: measuring the nitrogen concentration and the gas pressure in the sealed sampling cover 30; and determining the leakage amount of the sealing member 20 according to the change value of the nitrogen concentration and the gas pressure in the sealed sampling cover 30. In this way, the leakage amount of the sealing member 20 can be quantitatively calculated.

[0033] As shown in Figure 4 In the present embodiment, the furnace body 10 can be provided with a pressure sensor 73. For example, the pressure sensor 73 can be connected to the gas path between the sealed sampling cover 30 and the gas collecting device 50 to detect the gas pressure in the sealed sampling cover 30. The nitrogen concentration in the sealed sampling cover 30 is measured by the nitrogen concentration detector 71, and the change value of the nitrogen concentration in a certain time is calculated. According to the change value of the nitrogen concentration and the gas pressure in the sealed sampling cover 30, and combined with the ideal gas equation, the amount of nitrogen gas leaked through the sealing member 20 under normal temperature operation, i.e. the leakage amount of the sealing member 20, can be calculated.

[0034] In some embodiments, when the simulation operation is performed, the simulation waste liquid is an acidic nitrate solution, and the simulation waste liquid is calcined in the furnace body 10 to generate nitrogen oxides. Further, the leakage test is performed during the actual operation of the simulation rotary calcination furnace to determine the leakage amount of the sealing member 20 during the simulation actual operation, which comprises: detecting the presence of nitrogen oxides in the sealed sampling cover 30 to determine whether the sealing member 20 leaks.

[0035] In actual radioactive waste liquid treatment process, the radioactive waste liquid is generally acidic nitrate solution, and the acidic nitrate solution will produce nitrogen oxides when calcined in the furnace body 10. In the embodiment, the simulated waste liquid is an acidic nitrate solution, which simulates the actual operation process of the rotary calciner. The acidic nitrate solution will produce nitrogen oxides when calcined in the furnace body 10, and once the nitrogen oxides are detected in the sealed sampling cover 30, it can be determined that the sealing element 20 leaks.

[0036] Specifically, as shown in Figure 4 The gas collection device 50 is provided with an exhaust pipeline between the gas collection device 50 and the exhaust device 60, and the gas collection device 50 is also connected with the detection branch 80 which is communicated to the exhaust pipeline. The detection branch 80 is provided with a nitrogen oxide detector 74, which is used to detect whether there is nitrogen oxide in the sealed sampling cover 30 and its concentration, so as to determine whether the nitrogen oxide gas produced by the simulated waste liquid calcination in the simulated operation process leaks and its leakage amount.

[0037] Further, the detection branch 80 is also provided with a gas-liquid separation device 90, which is located upstream of the nitrogen oxide detector 74, and is used to separate the water vapor in the gas leaked from the sealing element 20. The gas after removing the water vapor is transported to the nitrogen oxide detector 74 for nitrogen oxide detection, so as to avoid the influence of water vapor on the detection result. In addition, the gas-liquid separation device 90 is also connected with a drain 91 for draining the separated water.

[0038] In some embodiments, the leakage test is carried out in the simulated actual operation process of the rotary calciner, and the leakage amount of the sealing element 20 in the simulated actual operation is determined, which further comprises: measuring the nitrogen concentration, gas temperature and gas pressure in the sealed sampling cover 30; according to the nitrogen concentration change value, gas temperature and gas pressure in the sealed sampling cover 30, the nitrogen oxide leakage amount of the sealing element 20 is determined. In this way, the quantitative measurement of the nitrogen oxide leakage amount of the sealing element 20 can be realized.

[0039] Specifically, as shown in Figure 4 The furnace body 10 can be provided with a temperature sensor 75. For example, the temperature sensor 75 can be connected to the gas path between the sealed sampling cover 30 and the gas collection device 50, which is used to detect the gas temperature in the sealed sampling cover 30. The nitrogen oxide concentration in the sealed sampling cover 30 is measured by the nitrogen oxide detector 74, and the change value of the nitrogen oxide concentration in a certain time is calculated. According to the nitrogen oxide concentration change value, gas pressure and gas temperature in the sealed sampling cover 30, combined with the ideal gas equation, the amount of nitrogen oxides leaked through the sealing element 20 under high temperature operation can be calculated, that is, the leakage amount of the sealing element 20.

[0040] In the present embodiment, the concentration of nitrogen oxides can be obtained by observing the change in the value of the nitrogen oxide detector. In some embodiments, due to the addition of the nitrate solution, the leaked gas contains water vapor, and the change in the quality of the gas can be obtained by measuring the temperature, humidity, and pressure change of the gas, and the quantitative measurement of the leaked gas can be performed.

[0041] In some embodiments, the nitrogen concentration detector 71, the oxygen concentration detector 72, the pressure sensor 73, the nitrogen oxide detector 74, and the temperature sensor 75 are all connected to the processor 76, and the processor 76 can collect and record the data monitored by these devices. In addition, the processor 76 can also generate the change curve of the data monitored by these devices to facilitate the analysis of the change trend.

[0042] In some embodiments, as shown in FIG. 6, the wear test method further includes a step S6: after the simulation operation of the rotary calcination furnace is completed, the sealing element 20 is disassembled, and the deformation amount of the sealing element 20 is measured. By measuring the deformation amount of the sealing element 20, the deformation condition of the sealing element 20 can be confirmed. Figure 5

[0043] In some embodiments, the deformation amount of the sealing element 20 at multiple measurement points in the circumferential direction can be measured, for example, the deformation amount of the sealing element 20 at 8 evenly distributed measurement points in the circumferential direction. By measuring the deformation amount at multiple measurement points in the circumferential direction, the average value of the deformation amount and the different deformation conditions of the sealing element 20 in different directions can be obtained, and the wear trend of the sealing element 20 can be analyzed.

[0044] In some embodiments, after the rotary calcination furnace is simulated for different times, the deformation amounts of the sealing element 20 under different operation times are compared, and the wear trend of the sealing element 20 with the operation time can be determined.

[0045] After the rotary calcination furnace is simulated for different times, the deformation amounts of the sealing element 20 under different operation times can be obtained, which can be used to measure the wear of the sealing element 20, and thus the wear trend of the sealing element 20 with the operation time can be obtained.

[0046] In some embodiments, the radial gap between the furnace body 10 and the sealing element 20 is adjusted; the simulation operation is repeated to obtain the leakage amount of the sealing element 20 under different radial gaps, so as to analyze the influence of the radial gap on the wear of the sealing element 20. The furnace body 10 will expand and deform at a higher temperature, and thus a radial gap will be generated with the sealing element 20. In the present embodiment, the wear condition of the sealing element 20 under different gaps is simulated by adjusting the radial gap between the furnace body 10 and the sealing element 20. By measuring the leakage amount of the sealing element 20 under different radial gaps, the relationship between the leakage amount of the sealing element 20 and the radial gap can be obtained.​

[0047] In some embodiments, after adjusting the radial gap between the furnace body 10 and the sealing member 20, in order to determine the specific value of the adjusted radial gap, a roundness standard standard part can be fixed outside the furnace body 10, the furnace body 10 and the standard part are concentrically arranged, the roundness value of the furnace body 10 when rotating is measured with the standard part as the reference surface, and the change value of the radial gap between the furnace body 10 and the sealing member 20 is determined according to the roundness value of the furnace body 10 when rotating.

[0048] In order to determine the adjustment result of the radial gap, it is necessary to measure the change value of the radial gap between the furnace body 10 and the sealing member 20. However, due to the special structure of the rotary calcining furnace and the high temperature of the sealing member 20 during normal operation of the rotary calcining furnace, the working temperature of the sensor for directly measuring the radial gap between the furnace body 10 and the sealing member 20 cannot meet the requirements. Therefore, in the present embodiment, a standard part is arranged concentrically outside the furnace body 10, that is, the standard part is coaxial with the furnace body 10. The standard part can be a roundness standard circular part, and the material of the standard part can be the same as that of the furnace body 10. The roundness value of the furnace body 10 relative to the reference surface of the standard part when rotating is measured by the standard part, and then the roundness value is converted into the change value of the radial gap between the furnace body 10 and the sealing member 20. By determining the change value of the radial gap, the adjustment of the radial gap between the furnace body 10 and the sealing member 20 is verified.

[0049] In some embodiments, the roundness value of the furnace body 10 when rotating can be measured by uniformly arranging a plurality of measurement points along the circumferential direction of the standard part. When measuring the roundness value of the furnace body 10 when rotating, the roundness value can be measured at a plurality of measurement points to obtain accurate measurement results. The plurality of measurement points are uniformly arranged along the circumferential direction of the standard part. For example, the number of measurement points can be 8.

[0050] In some embodiments, after obtaining the leakage amount of the sealing member 20 under different radial gaps, the relationship between the leakage amount of the sealing member 20 and the radial gap is determined according to the leakage amount of the sealing member 20 under different radial gaps. By adjusting the radial gap, the leakage amount of the sealing member 20 is measured under a plurality of different radial gaps, and the relationship between the leakage amount of the sealing member 20 and the radial gap is further obtained.

[0051] In some embodiments, after the rotary calcining furnace is started, the negative pressure value in the furnace body 10 can be monitored in real time, and the relationship between the leakage amount of the sealing element 20 and the negative pressure in the furnace body 10 can be determined according to the leakage amount of the sealing element 20 and the change of the negative pressure in the furnace body 10. The leakage amount of the sealing element 20 also causes the change of the negative pressure value in the furnace body 10, and a gas pressure measuring device can be arranged at the end of the furnace body 10 to measure the negative pressure value in the furnace body 10 and determine the leakage amount of the sealing element 20 corresponding to each negative pressure value, so as to obtain the relationship between the leakage amount of the sealing element 20 and the negative pressure in the furnace body 10, thereby providing reference data for the furnace negative pressure control parameter in the actual operation process of the rotary calcining furnace.

[0052] In some embodiments, the structure of the sealing element 20 and the negative pressure control parameter in the furnace body 10 are optimized according to the leakage amount of the sealing element 20 under different radial clearances, the deformation amount and the change of the negative pressure in the furnace body 10. After the relationship between the leakage amount of the sealing element 20 and the change of the radial clearance, the relationship between the leakage amount of the sealing element 20 and the change of the negative pressure in the furnace body 10, and the relationship between the deformation amount and the operation time are obtained, the structure parameters such as the length of the sealing element 20, the number of annular sealing structures in the sealing element 20, the radial clearance between the furnace body 10 and the sealing element 20, and the operation parameters such as the negative pressure in the furnace body 10 can be optimized, so as to reduce the wear of the sealing element 20. In addition, the service life of the sealing element 20 can be determined when the structure parameters and the operation parameters are known, and the replacement frequency of the sealing element 20 can be determined.

[0053] The wear test method in the embodiments of the present application can be applied to the wear and life research of the dynamic sealing structure of the rotary calcining furnace engineering scale and laboratory scale device.

[0054] For the embodiments of the present application, it should also be noted that the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments without conflict.

[0055] The above description is only for the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation obtained by using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method of testing the wear of a seal for a rotary calciner, characterized in that, The rotary calciner comprises a furnace body and a seal, the seal sealingly covers both ends of the furnace body to seal the furnace body, and the furnace body is rotatable relative to the seal; the method comprises: starting the rotary calciner and controlling the furnace body to rotate continuously; adjusting the pressure in the furnace body to a negative pressure state; filling nitrogen into the furnace body and conducting a leakage test to determine the leakage amount of the seal under normal temperature operation; after heating the furnace body to a working temperature, delivering simulated waste liquid into the furnace body to simulate the wear of the seal during actual operation of the rotary calciner; conducting a leakage test during the simulated operation of the rotary calciner to determine the leakage amount of the seal during simulated operation; wherein a sealing sampling cover is arranged outside the seal, and the seal is located in the sealing sampling cover; the step of filling nitrogen into the furnace body and conducting a leakage test to determine the leakage amount of the seal under normal temperature operation comprises: detecting the nitrogen concentration and oxygen concentration in the sealing sampling cover to determine whether the seal leaks.

2. The method of claim 1, wherein, the step of filling nitrogen into the furnace body and conducting a leakage test to determine the leakage amount of the seal under normal temperature operation further comprises: measuring the nitrogen concentration and gas pressure in the sealing sampling cover; determining the leakage amount of the seal according to the nitrogen concentration change value and gas pressure in the sealing sampling cover.

3. The method of claim 1, wherein, the simulated waste liquid is an acidic nitrate solution, and the simulated waste liquid is calcined in the furnace body to generate nitrogen oxides; the step of conducting a leakage test during the simulated operation of the rotary calciner to determine the leakage amount of the seal during simulated operation comprises: detecting the presence of nitrogen oxides in the sealing sampling cover to determine whether the seal leaks.

4. The method of claim 3, wherein, the step of conducting a leakage test during the simulated operation of the rotary calciner to determine the leakage amount of the seal during simulated operation further comprises: measuring the nitrogen oxide concentration, gas temperature and gas pressure in the sealing sampling cover; determining the nitrogen oxide leakage amount of the seal according to the nitrogen oxide concentration, the gas temperature and the gas pressure in the sealing sampling cover.

5. The method of claim 1, wherein, further comprising: after the simulated operation of the rotary calciner is completed, the seal is removed, and the deformation amount of the seal is measured.

6. The method of claim 5, wherein, the step of measuring the deformation of the seal comprises: measuring the deformation amount at a plurality of measurement points along the circumferential direction of the seal.

7. The method of claim 5, wherein, further comprising: after the rotary calciner is simulated for different times, the deformation amounts of the seal under different operation times are compared to determine the wear trend of the seal with the operation time.

8. The method of claim 5, wherein, further comprising: adjusting the radial gap between the furnace body and the seal; repeating the simulated operation to obtain the leakage amount of the seal under different radial gaps.

9. The method of claim 8, wherein, after adjusting the radial gap between the furnace body and the seal, further comprising: fixing a standard part of a roundness standard outside the furnace body, and the furnace body and the standard part are arranged concentrically; measuring the roundness run-out value of the furnace body during rotation with the standard part as a reference surface; determining the change value of the radial gap between the furnace body and the seal after adjustment according to the roundness run-out value of the furnace body during rotation.

10. The method of claim 9, wherein, The circular run-out value of the furnace body during rotation is measured, comprising: A plurality of measuring points are uniformly arranged along the circumferential direction of the standard part, and the circular run-out value of the furnace body during rotation is measured.

11. The method of claim 8, wherein, Further comprising: After obtaining the leakage amount of the seal under different radial clearances, the relationship between the leakage amount of the seal and the radial clearance is determined according to the leakage amount of the seal under different radial clearances.

12. The method of claim 11, wherein, Further comprising: After the rotary calcining furnace is started, the negative pressure value in the furnace body is monitored in real time. According to the leakage amount of the seal under different radial clearances and the change of the negative pressure in the furnace body, the relationship between the leakage amount of the seal and the negative pressure in the furnace body is determined.

13. The method of claim 12, wherein, Further comprising: According to the leakage amount of the seal, the deformation amount and the change of the negative pressure in the furnace body, the structure of the seal and the negative pressure control parameters in the furnace body are optimized.

Images