A temperature monitoring method, system and storage medium for a double-chamber lime kiln suspension cylinder

Abstract

The present invention discloses a temperature monitoring method, system and storage medium for a double-chamber lime kiln suspension cylinder, comprising the following steps: S1, obtaining the air temperature t of each temperature measuring point i in the air flow cooling channel of the suspension cylinder; i ; S2, obtain the estimated heat transfer constant const; S3, obtain the proportional temperature rise a of the temperature measurement interval j j ; According to the proportional temperature rise a j Corresponding proportional temperature rise curve, determine the proportional temperature rise a that deviates from the proportional temperature rise curve by more than the preset threshold j The temperature monitoring method of the double-chamber lime kiln suspension cylinder of the present invention uses the mean value screening method and the change of proportional temperature rise to make the abnormal temperature rise change significantly, determine the local over-temperature area, and is more sensitive to the capture and monitoring of the local over-temperature of the suspension cylinder. It can provide timely warning for the production site, thereby effectively extending the service life of the suspension cylinder.

Description

1. Technical Field

[0001] The invention relates to the technical field of temperature monitoring of a double-chamber lime kiln suspension cylinder, and in particular to a temperature monitoring method, system and storage medium for a double-chamber lime kiln suspension cylinder. 2 Background technology

[0002] The double-chamber lime kiln is one of the most advanced lime production equipments at present, and is widely used in the production of industrial lime and building lime. It is mainly composed of two vertical kiln chambers that are mirror images of each other. During the production process, coal powder and combustion-supporting air are supplied to one side of the kiln chamber to form a high-temperature environment, so that the limestone in the kiln chamber is decomposed at high temperature, which is called the calcining chamber; the other side of the kiln chamber is filled with normal temperature materials, and the high-temperature flue gas formed by the combustion chamber is introduced from the bottom and discharged from the top to preheat the materials. The kiln chamber on this side is called the heat storage chamber. After a cycle (about 14 minutes), the two kiln chambers exchange roles to achieve continuous production of lime. Because it adopts the double-chamber calcination-cycle reversing process, the high-temperature flue gas generated by calcination and the high-temperature exhaust gas formed by cooling of the finished product are used to preheat the materials before being discharged from the kiln chamber. The exhaust temperature can usually be reduced to about 120°C, so it has a high heat utilization rate.

[0003] In the prior art, a hanging cylinder-type annular channel is provided between the combustion chamber and the heat storage chamber to interconnect the airways of the two parallel kiln chambers so that the high-temperature flue gas can flow smoothly from one chamber to another. The hanging cylinder-type annular channel is surrounded by two layers of inner and outer steel shells, and refractory and heat-insulating materials are built or cast outside the steel shells. An annular cavity is formed inside the two layers of steel shells. Since the operating temperature outside the refractory material is as high as 1100°C, in order to avoid the steel from becoming weaker at high temperatures, forced ventilation and cooling of the annular cavity are usually required to ensure that the temperature of the steel shell is not too high. During the production process, the insulation material outside the steel shell will cause the local temperature of the steel shell to exceed the limit due to wear or cracking, resulting in structural failure and damage. Therefore, temperature monitoring and early warning of the outer shell of the hanging cylinder are very important.

[0004] At present, the main method used for monitoring is to set thermocouple thermometers at local locations, and use the temperature of several local points to replace the temperature of the entire suspension cylinder. When the temperature measuring point exceeds the temperature, an early warning is issued. However, when local overtemperature occurs at locations other than the temperature measuring point, an effective early warning cannot be issued, resulting in the inability to effectively capture the technical problem of local overtemperature affecting the service life of the suspension cylinder. 3. Summary of the invention

[0005] The temperature monitoring method of the double-chamber lime kiln hanging cylinder provided by the present invention solves the technical problem that the existing hanging cylinder temperature monitoring cannot effectively capture local overtemperature.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A temperature monitoring method for a double-chamber lime kiln hanging cylinder, wherein a plurality of temperature measuring points are arranged in an airflow cooling channel of the hanging cylinder, and the streamline lengths between two adjacent temperature measuring points are the same, i is defined as the temperature measuring point number, i∈[0, N], the temperature measuring points are numbered in sequence along the airflow direction in the airflow cooling channel, 0 represents the number of the first temperature measuring point, and N represents the number of the last temperature measuring point; N+1 temperature measuring points are defined to divide the airflow cooling channel into N temperature measuring intervals j, j=i+1, j∈[1, N], j is the temperature measuring interval number, and the temperature measuring interval number between the temperature measuring point i and the temperature measuring point i+1 is j, comprising the following steps: S1, obtaining the wind temperature t of each temperature measuring point i in the airflow cooling channel of the hanging cylinder i ; S2, obtain the estimated heat transfer constant const; S3, use formula a j =t i+1 -(1+const)•t i , obtain the proportional temperature rise a of the temperature measurement interval j j ; According to the proportional temperature rise a j Corresponding proportional temperature rise curve, determine the proportional temperature rise a that deviates from the proportional temperature rise curve by more than the preset threshold j The abnormal temperature rise is obtained, and the area corresponding to the abnormal temperature rise is the over-temperature area.

[0008] Further, in step S2, the formula The estimated heat transfer constant const of the suspension cylinder is calculated, where const represents the estimated heat transfer constant, h is the heat transfer coefficient between the cooling airflow and the wall, A is the total heat transfer area, m is the air flow rate of the cooling airflow, and c p It is wind than heat.

[0009] Further, step S3 specifically includes: S31, using formula a j＝ t i+1 -(1+const)·t i , obtain the proportional temperature rise a of the temperature measurement interval j j ; S32, comparative temperature rise a j The series of linear fitting is performed to obtain the first fitting linear line, y1 = c1 x1 + b1; S33, obtain the temperature rise a of each ratio j The corresponding fitting projection distance d on the first fitting linear line j ; S34, according to the fitting projection distance d j Get the average projection value d′; S35, using the preset formula From each ratio temperature rise a j Obtain the proportional temperature rise a corresponding to the preset formula j It is an abnormal temperature rise, wherein the range value of the first threshold k1 is 1.5 to 3; S36, determining that the area corresponding to the abnormal temperature rise is an over-temperature area.

[0010] Furthermore, the method further comprises the step of: S41, from each proportional temperature rise a j After eliminating all abnormal temperature rises, linear fitting is performed to obtain the second fitting linear line, y2 = c2 x2 + b2; S5, using the formula

[0011] Calculate the local temperature T corresponding to each abnormal temperature rise wc (i+1).

[0012] Furthermore, after step S41, it also includes: S42, judging whether the error between the estimated heat transfer constant const and the actual heat transfer constant is within the preset error value range; if the error between the estimated heat transfer constant const and the actual heat transfer constant is within the preset error value range, entering step S5.

[0013] Further, step S42 specifically includes: S421, obtaining the slope of the second fitting linear line and the correlation with the relative control error level parameter k2; S422, if |c2|≤k2, determining that the estimated heat transfer constant const and the actual heat transfer constant are within the preset error value range, and entering step S5; S423, if |c2|>k2, determining that the estimated heat transfer constant const and the actual heat transfer constant are not within the preset error value range, using formula The heat transfer constant correction value △C is calculated, M is the number of the last temperature measurement interval after removing the over-temperature area, a M is the proportional temperature rise of the temperature measurement interval M, F is the number of the first temperature measurement interval after excluding the over-temperature area, a F is the proportional temperature rise in the temperature measurement interval F, t M-1 is the wind temperature at the temperature measuring point numbered M-1; t F-1 is the wind temperature of the temperature measuring point numbered F-1; the formula const′=△C+const is used to calculate the corrected heat transfer constant const', and the corrected heat transfer constant const' is used to replace the estimated heat transfer constant const, and then after updating the estimated heat transfer constant const, step S3 is entered.

[0014] The present invention also provides a temperature monitoring system for a double-chamber lime kiln suspension cylinder, comprising a temperature sensor and a suspension cylinder with an airflow cooling channel. The temperature sensors are arranged in a one-to-one correspondence with the temperature measuring points, and the temperature sensors are used to monitor the temperature of the corresponding temperature measuring points. A plurality of temperature sensors are arranged at intervals along the extension direction of the airflow cooling channel, and the streamline lengths between two adjacent temperature sensors are the same. The present invention also includes a calculator device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned method for monitoring the temperature of the double-chamber lime kiln suspension cylinder is implemented.

[0015] Furthermore, the airflow cooling channel adopts a spiral cooling channel, which includes a spiral inlet channel and a spiral outlet channel. The top of the spiral inlet channel is provided with an air inlet, and the top of the spiral outlet channel is provided with an air outlet. The spiral inlet channel and the spiral outlet channel are connected to each other from the bottom of the suspension cylinder.

[0016] Furthermore, the airflow cooling channel adopts an annular cooling channel, which includes an annular input channel and an annular output channel. The top of the annular input channel is provided with an air inlet, and the top of the annular output channel is provided with an air outlet. The annular input channel and the annular output channel are interconnected from the bottom of the suspension cylinder.

[0017] The present invention also provides a storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for monitoring the temperature of the hanging cylinder of a double-chamber lime kiln are implemented.

[0018] The present invention has the following beneficial effects:

[0019] The temperature monitoring method of the double-chamber lime kiln hanging cylinder of the present invention obtains the wind temperature t of each temperature measuring point. i , by obtaining the estimated heat transfer constant const of the suspension cylinder, the proportional temperature rise a of the temperature measurement interval j is obtained by the formula j ; Finally, according to the proportional temperature rise a j The relative relationship between the proportional temperature rise curve and the proportional temperature rise curve is to find the proportional temperature rise a that deviates from the proportional temperature rise curve by more than the preset threshold. j Determine the local over-temperature area; the present invention adopts the heat transfer law based on the wind flow (cooling airflow) and the wall, derives and designs the use of monitoring points to measure the temperature, calculates the estimated heat transfer constant, and uses the mean elimination method and the change of proportional temperature rise to make the abnormal temperature rise change significantly, so as to determine the local over-temperature area. It can accurately measure the average temperature of the suspension cylinder and capture the local temperature overheating of the suspension cylinder. The capture and monitoring of the local overheating of the suspension cylinder are more sensitive, and can provide timely warning for the production site, thereby effectively extending the service life of the suspension cylinder.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. 4. Description of the drawings

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 It is a flow chart of a method for monitoring the temperature of a hanging cylinder of a double-chamber lime kiln in one embodiment of the present invention;

[0023] Figure 2 is a schematic flow chart of step S3 in one embodiment of the present invention;

[0024] Figure 3 is a flow chart of a method for monitoring the temperature of a hanging cylinder of a double-chamber lime kiln in another embodiment of the present invention;

[0025] Figure 4 is a flow chart of step S42 in one embodiment of the present invention;

[0026] Figure 5 This is one of the structural schematic diagrams of the hanging cylinder for the double-chamber lime kiln in the present invention;

[0027] Figure 6 This is the second structural schematic diagram of the hanging cylinder for the double-chamber lime kiln in the present invention;

[0028] Figure 7 It is one of the principle schematic diagrams of a specific monitoring example in the present invention;

[0029] Figure 8 This is the second schematic diagram of the principle of a specific monitoring example in the present invention;

[0030] Fig. 9 This is the third schematic diagram of the principle of a specific monitoring example in the present invention.

[0031] Legend:

[0032] 100, suspension cylinder; 10, outer shell; 20, inner shell; 30, annular air flow channel; 31, air intake channel; 32, exhaust channel; 40, middle partition; 50, spiral-in spiral blade; 60, spiral-out spiral blade; 70, temperature sensor; 80, air intake duct; 90, exhaust duct. 5. Specific implementation methods

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides a temperature monitoring method for a double-chamber lime kiln suspension cylinder, wherein a plurality of temperature measuring points are arranged in the airflow cooling channel of the suspension cylinder, and the streamline lengths between two adjacent temperature measuring points are the same, i is defined as the temperature measuring point number, i∈[0, N], the temperature measuring points are numbered in sequence along the airflow direction in the airflow cooling channel, 0 represents the number of the first temperature measuring point, and N represents the number of the last temperature measuring point; N+1 temperature measuring points are defined to divide the airflow cooling channel into N temperature measuring intervals j, j=i+1, j∈[1, N], j is the temperature measuring interval number, and the temperature measuring interval number between the temperature measuring point i and the temperature measuring point i+1 is j, comprising the following steps: S1, obtaining the wind temperature t of each temperature measuring point i in the airflow cooling channel of the suspension cylinder i ; S2, obtain the estimated heat transfer constant const; S3, use formula a j =t i+1 -(1+const)·t i , obtain the proportional temperature rise a of the temperature measurement interval j j ; According to the proportional temperature rise a j Corresponding proportional temperature rise curve, determine the proportional temperature rise a that deviates from the proportional temperature rise curve by more than the preset threshold j The abnormal temperature rise is obtained, and the area corresponding to the abnormal temperature rise is the over-temperature area.

[0038] The temperature monitoring method of the double-chamber lime kiln suspension cylinder provided by the present invention obtains the wind temperature t at each temperature measuring point. i , by obtaining the estimated heat transfer constant const of the suspension cylinder, the proportional temperature rise a of the temperature measurement interval j is obtained by the formula j; Finally, according to the proportional temperature rise a j The relative relationship between the proportional temperature rise curve and the proportional temperature rise curve is to find the proportional temperature rise a that deviates from the proportional temperature rise curve by more than the preset threshold. j Determine the local over-temperature area; the present invention adopts the heat transfer law based on the wind flow (cooling airflow) and the wall, derives and designs the use of monitoring points to measure the temperature, calculates the estimated heat transfer constant, and uses the mean elimination method and the change of proportional temperature rise to make the abnormal temperature rise change significantly, so as to determine the local over-temperature area. It can accurately measure the average temperature of the suspension cylinder and capture the local temperature overheating of the suspension cylinder. The capture and monitoring of the local overheating of the suspension cylinder are more sensitive, and can provide timely warning for the production site, thereby effectively extending the service life of the suspension cylinder.

[0039] It can be understood that in the present invention, a total of N+1 temperature sensors are provided, and the multiple temperature sensors are arranged along the airflow direction in the airflow cooling channel, and the temperature measurement points are numbered in sequence with a natural number i, i∈[0, N], t i It indicates the temperature value obtained by the temperature sensor numbered i. Obviously, t0 is the temperature measured by the temperature sensor numbered 0, that is, the wind temperature at the temperature measuring point at the air inlet of the air flow cooling channel, t N It is the temperature measured by the temperature sensor numbered N, that is, the wind temperature at the temperature measuring point at the exhaust outlet of the airflow cooling channel.

[0040] Further, in step S2, the formula The estimated heat transfer constant const of the suspension cylinder is calculated, where const represents the estimated heat transfer constant, h is the heat transfer coefficient between the cooling airflow and the wall, A is the total heat transfer area, m is the air flow rate of the cooling airflow, and c p In the present invention, t0 represents the wind temperature at the temperature measuring point at the air inlet of the air flow cooling channel, t N Indicates the wind temperature at the measuring point at the exhaust outlet of the airflow cooling channel.

[0041] It can be understood that i represents the number of the temperature measuring point (temperature detector), t i It is represented by the wind temperature corresponding to the temperature measuring point, j (j=i+1) represents the temperature measuring interval number between the temperature measuring point i and the temperature measuring point i+1, a j (i.e. a i+1 ) represents the proportional temperature rise of the temperature measurement interval numbered j, that is, the proportional temperature rise between the temperature measurement point numbered i and the temperature measurement point numbered i+1. In specific implementation, if the proportional temperature rise a5 is significantly higher than the theoretical proportional temperature rise curve (fitting curve y1=c1·x1+b1), it indicates that the temperature measurement interval numbered 5 is an over-temperature area.

[0042] It can be understood that the temperature rise a can be jThe first fitting linear line (i.e., proportional temperature rise curve) is obtained by linear fitting of the series, y1=c1·x1+b1.

[0043] Please refer to Figure 2 , further, step S3 specifically includes: S31, using formula a i+1 =t i+1 -(1+const)·t i , that is, a j =t i+1 -(1+const)•t i , obtain the proportional temperature rise a between two adjacent temperature measurement points j , where j = i + 1, a j represents the proportional temperature rise between the i-th temperature measuring point and the i+1-th temperature measuring point; S32, proportional temperature rise a j The first fitting linear line is obtained by linear fitting of the series.

[0044] y1=c1·x1+b1 (3)

[0045] S33, obtain each proportional temperature rise a j The corresponding fitting projection distance d on the first fitting linear line j ; S34, according to the fitting projection distance d j Get the average projection value d′; S35, using the preset formula

[0046]

[0047] From each ratio temperature rise a j Obtain the proportional temperature rise a corresponding to the preset formula j is abnormal temperature rise, wherein the range value of the first threshold k1 is 1.5 to 3; S36, determine that the area corresponding to the abnormal temperature rise is an over-temperature area. It can be understood that k1 is a screening threshold set to be greater than 1. The larger the k1 value, the smaller the sensitivity, but the smaller the probability of misjudgment; the smaller the k1 value, the greater the sensitivity, but the greater the probability of misjudgment. In the present invention, the range value of k1 is 1.5 to 3 according to the actual on-site trial. In the specific implementation, if d j Value Satisfaction This indicates that there is local overtemperature between the i-th temperature measuring point and the i+1-th temperature measuring point.

[0048] It can be understood that y1 refers to the proportional temperature rise of the temperature measurement interval, x1 is the streamline length from the starting point of the temperature measurement interval to the end point of the temperature measurement interval, c1 is the slope of the straight line, and b1 is the intercept of the straight line.

[0049] It can be understood that in the present invention, the temperature rise of two adjacent ratios a can be jThe slope of the line connecting the two adjacent proportional temperature rises determines the abnormal temperature rise. j If the absolute value of the slope is greater than the preset slope value, the corresponding proportional temperature rise a at the rear is determined. j Abnormal temperature rise.

[0050] Please refer to Figure 3 , further comprising the step of: S41, from each proportional temperature rise a j After eliminating all abnormal temperature rises, a linear fit is performed to obtain the second fitting linear line.

[0051] y2=c2·x2+b2 (6)

[0052] S5, using the formula Calculate the local temperature T corresponding to each abnormal temperature rise wc By adopting the above method, the over-temperature corresponding to the local abnormal temperature rise can be accurately calculated, which is convenient for maintenance and improves the service life of the suspension cylinder.

[0053] Furthermore, after step S41, it also includes: S42, judging whether the error between the estimated heat transfer constant const and the actual heat transfer constant is within the preset error value range; if the error between the estimated heat transfer constant const and the actual heat transfer constant is within the preset error value range, entering step S5.

[0054] Furthermore, if the error between the estimated heat transfer constant const and the actual heat transfer constant is not within the preset error value range, the estimated average wall temperature T′ is corrected and updated w Then proceed to step S3.

[0055] Please refer to Figure 4 , further, step S42 specifically includes: S421, obtaining the slope of the second fitting linear line and the correlation with the relative control error level parameter k2; S422, if |c2|≤k2, determining that the estimated heat transfer constant const and the actual heat transfer constant are within the preset error value range, and entering step S5; S423, if

[0056] |c2|>k2 (7)

[0057] It is determined that the estimated heat transfer constant const and the actual heat transfer constant are not within the preset error value range, using the formula The heat transfer constant correction value △C is calculated, M is the number of the last temperature measurement interval after removing the over-temperature area, a M is the proportional temperature rise of the temperature measurement interval M, F is the number of the first temperature measurement interval after excluding the over-temperature area, a F is the proportional temperature rise in the temperature measurement interval F, t M-1is the wind temperature at the temperature measuring point numbered M-1 (i.e., the entrance temperature measuring point of the temperature measuring interval M); t F-1 is the wind temperature of the temperature measuring point numbered F-1 (i.e., the entrance temperature measuring point of the temperature measuring interval F); the formula const′=△C+const is used to calculate the modified heat transfer constant const', and the modified heat transfer constant const' is used to replace the estimated heat transfer constant const, and then after updating the estimated heat transfer constant const, step S3 is entered. It can be understood that if the original temperature measuring intervals are numbered as temperature measuring interval 1, temperature measuring interval 2, temperature measuring interval 3, temperature measuring interval 4, and temperature measuring interval 5; after excluding the over-temperature interval 1 and the over-temperature interval 3, F=2.

[0058] It can be understood that the specific operation process of correcting the estimated heat transfer constant const is as follows: after eliminating the local abnormal temperature rise, recalculate a j Perform linear fitting on the series to obtain the second fitting linear line, y2=c2·x2+b2; determine whether the error of the estimated heat transfer constant const is within an acceptable range by judging the value of c2: if: |c2|>k2, it indicates that the error is too large, and the estimated heat transfer constant const is corrected according to the following formula: const′: △C+const. Finally, the estimated heat transfer constant const is replaced by the corrected heat transfer constant const, and then after the estimated heat transfer constant const is updated, step S3 is entered; if:

[0059] |c2|≤k2 (10)

[0060] If the error is within an acceptable range, the process jumps to step S5. k2 is a setting parameter for controlling the error level. The smaller the value, the smaller the error, but the iteration and calculation time will increase; vice versa.

[0061] Furthermore, using the formula

[0062]

[0063] The average projection value d′ is calculated.

[0064] It can be understood that in another embodiment, first, the wind temperature t of each temperature measurement point is obtained. i , including t0, t1, t2, t3, t4, ..., t7, t8, t9, ..., t N ; Including temperature measurement interval j1 to j N ,; secondly, obtain the estimated heat transfer constant const; then, obtain the proportional temperature rise a according to the estimated heat transfer constant const j , including a1, a2, a3, a4,...a7, a8, a9,...a N; According to the proportional temperature rise and the proportional temperature rise curve, find the abnormal temperature rise a4, a8; correct the heat transfer constant, obtain the corrected heat transfer constant const', update the estimated heat transfer constant, and enter step S3; re-obtain the proportional temperature rise a j， Among them, a4 and a8 are no longer calculated.

[0065] Please refer to Figure 5 and Figure 6 The present invention also provides a temperature monitoring system for a double-chamber lime kiln suspension cylinder, comprising a temperature sensor and a suspension cylinder with an airflow cooling channel, wherein the temperature sensors are arranged in a one-to-one correspondence with the temperature measuring points, and the temperature sensors are used to monitor the temperature of the corresponding temperature measuring points, and a plurality of temperature sensors are arranged at intervals along the extension direction of the airflow cooling channel, and the streamline lengths between two adjacent temperature sensors are the same, and further comprising a calculator device, wherein the calculator device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above-mentioned temperature monitoring method for the double-chamber lime kiln suspension cylinder when executing the computer program.

[0066] Furthermore, the airflow cooling channel adopts a spiral cooling channel, which includes a spiral inlet channel and a spiral outlet channel. The top of the spiral inlet channel is provided with an air inlet, and the top of the spiral outlet channel is provided with an air outlet. The spiral inlet channel and the spiral outlet channel are connected to each other from the bottom of the suspension cylinder.

[0067] Furthermore, the airflow cooling channel adopts an annular cooling channel, which includes an annular input channel and an annular output channel. The top of the annular input channel is provided with an air inlet, and the top of the annular output channel is provided with an air outlet. The annular input channel and the annular output channel are interconnected from the bottom of the suspension cylinder.

[0068] Please refer again Figure 5 and Figure 6 Optionally, the specific structure of the temperature monitoring system of the double-chamber lime kiln suspension cylinder is as follows: it includes a suspension cylinder 100 with an annular airflow channel, the suspension cylinder 100 includes an outer shell 10 and an inner shell 20, the outer shell 10 is arranged around the inner shell 20 to form an annular airflow channel 30, and also includes a middle partition 40, a spiral screw-in spiral blade 50 and a spiral screw-out spiral blade 60, the middle partition 40 is arranged between the outer shell 10 and the inner shell 20 to separate the annular airflow channel 30 into an intake channel 31 and an exhaust channel 32, the spiral screw-in spiral blade 50 is arranged in the intake channel 31 to form a spiral screw-in channel for the intake channel 31, the spiral screw-out spiral blade 60 is arranged in the exhaust channel 32 to form a spiral screw-out channel for the exhaust channel 32, the intake end of the spiral screw-in channel is provided with an intake inlet, the exhaust end of the spiral screw-out channel is provided with an exhaust outlet, the exhaust end of the spiral screw-in channel and the intake end of the spiral screw-out channel are connected to each other to form a spiral cooling channel.

[0069] It can be understood that in the present invention, the outer shell 10 and the inner shell 20 are both made of steel structure, and the middle partition 40, the spiral-in spiral blade 50 and the spiral-out spiral blade 60 can be made of steel structure; the spiral-in spiral blade 50 is arranged circumferentially around the suspension cylinder 100 and extends axially toward the bottom of the suspension cylinder 100 to introduce the cooling airflow, and the spiral-out spiral blade 60 is arranged circumferentially around the suspension cylinder 100 and extends axially toward the top of the suspension cylinder 100 to lead out the cooling airflow.

[0070] Optionally, the spiral screw-in spiral blade 50 is screwed around the inner shell 20 and is arranged between the middle partition 40 and the inner shell 20, so that the air intake channel 31 forms a spiral screw-in channel, and the spiral screw-out spiral blade 60 is screwed around the middle partition 40 and is arranged between the middle partition 40 and the outer shell 10, so that the exhaust channel 32 forms a spiral screw-out channel. It can be understood that since the inner temperature of the suspension cylinder 100 is higher than the outer temperature, in order to facilitate lowering the temperature of the inner shell 20, the spiral screw-in channel is arranged close to the inner shell 20.

[0071] Optionally, the spiral-in spiral blade 50 is screwed around the inner shell 20 and is screwed in between the middle partition 40 and the inner shell 20, so that the air intake channel 31 forms a spiral-in channel, and the spiral-out spiral blade 60 is screwed around the middle partition 40 and is screwed out between the middle partition 40 and the outer shell 10, so that the exhaust channel 32 forms a spiral-out channel.

[0072] Optionally, the air inlet is arranged at the top of the suspension cylinder 100, the exhaust outlet is arranged at the top of the suspension cylinder 100, the bottom of the spiral input spiral sheet 50 is provided with a first air vent hole, and the bottom of the spiral output spiral sheet 60 is provided with a second air vent hole. By setting the first air vent hole and the second air vent hole, the spiral input channel and the spiral output channel are connected from the bottom of the suspension cylinder 100, and then the spiral input channel and the spiral output channel are combined to form a spiral cooling channel.

[0073] Optionally, an air intake duct 80 disposed outside the suspension cylinder 100 and connected to the air intake inlet, and an exhaust duct 90 disposed outside the suspension cylinder 100 and connected to the exhaust outlet are also included. Thus, the cooling airflow is introduced into the spiral channel from above the suspension cylinder 100 through the air intake duct 80, and the cooled cooling airflow is led out from above the suspension cylinder 100.

[0074] Optionally, in order to detect the temperature of the spiral cooling channel and avoid local overheating, a temperature sensor 70 is provided in each spiral cooling channel. Optionally, the temperature sensor 70 is a thermocouple.

[0075] Optionally, the temperature sensors 70 are arranged at intervals along the streamline length in the airflow direction.

[0076] It can be understood that when cooling is carried out, a cooling airflow is sent into the air inlet end of the spiral rotation channel, and the cooling airflow flows through the spiral rotation channel to cool the shell on one side of the spiral rotation channel; then the cooling airflow continues to flow from the exhaust end of the spiral rotation channel into the air inlet end of the spiral rotation channel, and the cooling airflow flows through the spiral rotation channel to cool the shell on one side of the spiral rotation channel, and finally flows out from the exhaust outlet of the spiral rotation channel; the annular cooling suspension cylinder for the double-chamber lime kiln of the present invention, since the cooling air flow channel is arranged in a spiral shape that fits the wall, the change of the streamline direction of the cooling air flow is slower and smoother, avoiding the vertical or sharp flow channel angles in the prior art, so the flow of the cooling air flow is smoother, and the pressure drop of the cooling air flow in and out of the annular air flow channel is significantly reduced compared with the prior art. At the same time, since the design of the spiral air flow channel avoids small angles in the flow channel, there is almost no dead zone of the flow field in the entire flow channel, which can effectively avoid local overheating caused by the dead zone of the flow field, and the cooling air flow has smaller flow resistance during the cooling process, and the cooling effect is good.

[0077] Through research, it was found that the temperature monitoring of the suspension cylinder in the prior art is to set a number of thermocouple thermometers at local positions of the suspension cylinder body, and monitor and warn by directly capturing the temperature anomaly of the measuring point. This method can only capture the temperature over-limit or the overall temperature over-limit at the measuring point and its vicinity, and is not sensitive enough to the temperature change at a certain distance from the measuring point. When local over-temperature occurs in the area other than the vicinity of the temperature measuring point, the temperature at the temperature measuring point often does not change significantly. Therefore, it is impossible to accurately monitor and timely warn of the local over-temperature in the unexpected area of ​​the temperature measuring point. In the present invention, a suspension cylinder temperature monitoring method based on mean screening is adopted. By calculating the proportional temperature rise between the temperature measuring rooms and performing linear changes, local over-temperature is effectively captured, the sensitivity of the temperature measuring system to local over-temperature is improved, timely warnings are provided for the production site, and the service life of the suspension cylinder is effectively extended.

[0078] The present invention also provides a storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for monitoring the temperature of the hanging cylinder of a double-chamber lime kiln are implemented.

[0079] The theoretical basis of the temperature monitoring method of the present invention is as follows:

[0080] First, the study found the functional relationship between wall temperature and wind temperature: when the lime kiln is running, the material temperature is generally maintained at 1100℃. The material temperature is generally below 500℃ when it is transmitted to the steel shell of the suspension cylinder through the refractory layer and the heat insulation layer. Since the material temperature field in the annular channel is relatively uniform, it can be assumed that when there is no local damage, the temperature of the suspension cylinder shell is basically uniform. w The heat transfer process of the fluid flowing through the constant temperature wall can be described by the following formula:

[0081] h·C·dx·(T w -t x )=m·c p ·dt x ,

[0082] Right now:

[0083]

[0084] After integrating both sides of the above equation, we have:

[0085]

[0086] In the formula, h is the heat transfer coefficient between the gas and the wall, which is basically the same at all places of the suspension cylinder shell; C is the contact boundary length between the gas and the shell, △x is the integration step (the streamline length of a single temperature measurement interval), C×△x=A is the contact area; m is the air flow rate; cp is the wind specific heat. The above formula can be transformed as follows:

[0087]

[0088] When the measurement points are set densely enough, there are:

[0089] t x+△x -t x <<T w -t x

[0090] have:

[0091]

[0092] Substituting into the previous form, we have:

[0093]

[0094] The wind temperature iteration formula can be obtained by deformation:

[0095] t x+△x -(1+const)t x =-const·T w

[0096] Define the proportional temperature rise series a j (i.e. a i+1 ):

[0097] a i+1 =t i+1 -(1+const)·t i (2)

[0098] From the wind temperature iteration formula, we can know:

[0099] a i+1=-const·T w

[0100] Therefore, under the condition of no local overheating, the proportional temperature rise series a j is a constant.

[0101] Secondly, the influence of local overtemperature on wind temperature is studied: According to the formula: a i+1 =-const·T w It can be seen that at all locations with non-abnormal temperature rise, the proportional temperature rise a j is a constant, while at abnormal temperature rise, the proportional temperature rise a j There will be obvious differences. Therefore, we can j The series of numbers is linearly fitted to obtain the first fitted linear line, y1=c1·x1+b1. The point that obviously deviates from the first fitted linear line is the abnormal temperature rise. The following mean value screening method can be used to determine whether a point is a point that deviates significantly:

[0102] Calculate a j The projection distance d from the first fitting linear line i , then calculate d i The average value d′ is the average value of the abnormal temperature rise. Since the number of abnormal temperature rises is generally much smaller than the number of monitoring points, the average value d′ will be closer to the projection distance between the normal point and the first fitting linear line, and the abnormal temperature rise d i The value is much larger than the average value d′, so the following formula can be used to check for abnormal temperature rise:

[0103]

[0104] Next, the correction method of estimating the heat transfer coefficient const of the cylinder wall is studied: Due to the estimation error of the wall heat transfer coefficient h, when the heat transfer characteristic number const is calculated using formula (1), an estimation error ΔC will be generated. Error ΔC = const'-const. Then the proportional temperature rise a calculated using the estimated heat transfer characteristic number is j :

[0105] a i+1 =t i+1 -(1+const+△C)·t i

[0106] The proportional temperature rise a' calculated using the actual wall temperature j :

[0107]

[0108] The proportional temperature rise error △a caused by the estimated wall temperature error j :

[0109] Δa i+1=-ΔC·t i

[0110] have:

[0111]

[0112] Therefore, there is a calculation formula for the heat transfer characteristic error ΔC:

[0113]

[0114] And the corrected formula:

[0115] const′=△C+const (9)

[0116] Finally, the calculation method of the average wall temperature Tw and the local overtemperature value Twc is studied: after eliminating the abnormal temperature rise, according to formula a i+1 =--const·T w , we can see that the second fitted linear line, y2 = c2·x2+b2 will converge to y2 = --const·T w

[0117] So we have:

[0118] -const · T w =b2

[0119] The calculation formula for the average wall temperature Tw is:

[0120]

[0121] According to the wind temperature iteration formula: t x+△x -(1+const)t x =--const·T w The calculation formula of local overtemperature Twc can be obtained:

[0122]

[0123] Among them, i+1 is the subscript corresponding to the abnormal temperature rise, and i is the temperature measurement point adjacent to the abnormal temperature rise.

[0124] Please refer to Figure 7 and Figure 8, a specific monitoring example is used to illustrate: in this example, the actual average wall temperature is 600℃, the cold fluid inlet temperature is 25℃, the cold fluid outlet temperature is 250℃, and there are 41 temperature measurement points. Among them, there is a local high temperature of 650℃ between the 8th to 9th, 16th to 17th, 24th to 25th, and 32nd to 33rd temperature measurement points. The actual const value is 1.24×10-2, and the const value estimated by formula (1) is 1.12×10-2. The actual temperature value of each point obtained by measurement and the proportional temperature rise value calculated by the estimated const are as follows. Figure 7 The measured temperature values ​​of each point and the corresponding curves of the proportional temperature rise values ​​calculated by the estimated const are given respectively. It can be seen from the figure that the local abnormal temperature rise does not clearly reflect the abnormality in the measured temperature curve, but in the proportional temperature rise curve, it can be clearly seen that in the abnormal temperature rise, the curve value deviates greatly from other normal values. The abnormal temperature rise proportional temperature rise value is obviously farther away from the linear fitting curve, so it can be easily found by the mean value screening method.

[0125] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for monitoring the temperature of a double-chamber lime kiln suspension cylinder, characterized in that: A plurality of temperature measuring points are arranged in the airflow cooling channel of the suspension cylinder, and the streamline lengths between two adjacent temperature measuring points are the same. i is defined as the temperature measuring point number, i∈[0, N], and the temperature measuring points are numbered in sequence along the airflow direction in the airflow cooling channel, 0 represents the number of the first temperature measuring point, and N represents the number of the last temperature measuring point; N+1 temperature measuring points are defined to divide the airflow cooling channel into N temperature measuring intervals j, j=i+1, j∈[1, N], j is the temperature measuring interval number, and the temperature measuring interval between the temperature measuring point i and the temperature measuring point i+1 is numbered j, including the following steps: S1, obtain the air temperature t of each temperature measuring point i in the air flow cooling channel of the suspension cylinder i ; S2, obtain the estimated heat transfer constant const; S3, using formula a j =t i+1 -(1+const)·t i , obtain the proportional temperature rise a of the temperature measurement interval j j ; According to the ratio of temperature rise a j The corresponding proportional temperature rise curve is determined to determine the proportional temperature rise a that deviates from the proportional temperature rise curve by more than a preset threshold. j The abnormal temperature rise is obtained, and the area corresponding to the abnormal temperature rise is the over-temperature area.

2. The method for monitoring the temperature of the suspension cylinder of a double-chamber lime kiln according to claim 1, characterized in that: In step S2, the formula The estimated heat transfer constant const of the suspension cylinder is calculated, where const represents the estimated heat transfer constant, h is the heat transfer coefficient between the cooling airflow and the wall, A is the total heat transfer area, m is the air flow rate of the cooling airflow, and c p It is wind than heat.

3. The temperature monitoring method of the double-chamber lime kiln suspension cylinder according to claim 1 is characterized in that: The step S3 specifically includes: S31, using formula a j =t i+1 -(1+const)·t i , obtain the proportional temperature rise a of the temperature measurement interval j j ; S32, the proportional temperature rise a j The first fitting linear line is obtained by linear fitting of the series, y1=c1·x1+b1; S33, obtaining each of the proportional temperature rises a j The corresponding fitting projection distance d on the first fitting linear line j ; S34, according to the fitting projection distance d j Get the average projection value d′; S35, using the preset formula From each of the above mentioned ratios, the temperature rise a j Obtain the proportional temperature rise a corresponding to the preset formula j is an abnormal temperature rise, wherein the range value of the first threshold k1 is 1.5 to 3; S36, determining that the area corresponding to the abnormal temperature rise is an over-temperature area.

4. The method for monitoring the temperature of the suspension cylinder of a double-chamber lime kiln according to claim 3, characterized in that: Also includes the steps: S41, from each of the above-mentioned proportional temperature rise a j After eliminating all the abnormal temperature rises, a linear fit is performed to obtain a second fitting linear line, y2=c2·x2+b2; S5, using the formula Calculate the local temperature T corresponding to each abnormal temperature rise wc (i+1).

5. The method for monitoring the temperature of the suspension cylinder of a double-chamber lime kiln according to claim 4, characterized in that: After step S41, the method further includes: S42, judging whether the error between the estimated heat transfer constant const and the actual heat transfer constant is within the preset error value range; if the error between the estimated heat transfer constant const and the actual heat transfer constant is within the preset error value range, entering step S5.

6. The method for monitoring the temperature of the suspension cylinder of a double-chamber lime kiln according to claim 5, characterized in that: The step S42 specifically includes: S421, obtaining the correlation between the slope of the second fitting linear line and the relative control error level parameter k2; S422, if |c2|≤k2, determine that the estimated heat transfer constant const and the actual heat transfer constant are within a preset error value range, and proceed to step S5; S423, if |c2|>k2, it is determined that the estimated heat transfer constant const and the actual heat transfer constant are not within the preset error value range, and the formula is used The heat transfer constant correction value △C is calculated, where M is the number of the last temperature measurement interval after removing the over-temperature area, aM is the proportional temperature rise of the temperature measurement interval M, and F is the number of the first temperature measurement interval after removing the over-temperature area. F is the proportional temperature rise in the temperature measurement interval F, t M-1 is the wind temperature at the temperature measuring point numbered M-1; t F-1 is the wind temperature of the temperature measuring point numbered F-1; the formula const′=△C+const is used to calculate the corrected heat transfer constant const', and the corrected heat transfer constant const' is used to replace the estimated heat transfer constant const, and then after updating the estimated heat transfer constant const, step S3 is entered.

7. A temperature monitoring system for a double-chamber lime kiln suspension cylinder, characterized in that: It comprises a temperature sensor and a suspension cylinder with an airflow cooling channel, wherein the temperature sensor is arranged in one-to-one correspondence with the temperature measuring point, and the temperature sensor is used to monitor the temperature of the corresponding temperature measuring point, and a plurality of the temperature sensors are arranged at intervals along the extension direction of the airflow cooling channel, and the streamline lengths between two adjacent temperature sensors are the same. It also includes a calculator device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the temperature monitoring method for the suspension cylinder of a double-chamber lime kiln as described in any one of claims 1 to 6 is implemented.

8. The double-chamber lime kiln suspension cylinder temperature monitoring system according to claim 7 is characterized in that: The airflow cooling channel adopts a spiral cooling channel, which includes a spiral inlet channel and a spiral outlet channel. The top of the spiral inlet channel is provided with an air inlet, and the top of the spiral outlet channel is provided with an air outlet. The spiral inlet channel and the spiral outlet channel are connected to each other from the bottom of the suspension cylinder.

9. The temperature monitoring system for the double-chamber lime kiln suspension cylinder according to claim 7 is characterized in that: The airflow cooling channel adopts an annular cooling channel, which includes an annular input channel and an annular output channel. The top of the annular input channel is provided with an air inlet, and the top of the annular output channel is provided with an air outlet. The annular input channel and the annular output channel are connected to each other from the bottom of the suspension cylinder.

10. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for monitoring the temperature of the suspension cylinder of a double-chamber lime kiln as described in any one of claims 1 to 6 are implemented.

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