Cement plant kiln tail smoke chamber high-temperature gas sampling system

Abstract

The utility model discloses a cement plant kiln tail smoke chamber high-temperature gas sampling system. The system comprises a high-temperature sampling probe; the transmission device is used for driving the collecting end of the high-temperature sampling probe to enter or exit from the rotary kiln and driving the high-temperature sampling probe to rotate around the central axis of the high-temperature sampling probe; the air storage tank device is used for providing blowback compressed air for the high-temperature sampling probe on one hand and providing pneumatic compressed air for the transmission device on the other hand so as to drive the transmission device to act; the cooling device is used for cooling the high-temperature sampling probe; a gas analysis inlet of the gas analysis device is connected with a sample gas outlet of the high-temperature sampling probe; and the control device is respectively connected with the transmission device, the gas storage tank device, the cooling device and the gas analysis device and is used for controlling all the devices to work cooperatively. The intelligent high-temperature gas analysis system realizes intelligence and automation of high-temperature gas analysis.

Description

Technical Field

[0001] This utility model relates to the technical field of high-temperature gas sampling equipment, and in particular to a high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant. Background Technology

[0002] Competition among cement companies is essentially a competition of cost and quality. The lower the production cost and the better the quality, the stronger the company's competitiveness. Many companies invest heavily in APC (Optimization and Control System) to help reduce production costs and improve product quality. In the APC system, CO and NO generated at high temperatures in the kiln tail flue are analyzed. X O2 analysis data plays a very important role in the control of the APC system, and high-temperature gas analyzers have become an indispensable analytical instrument in various cement plants.

[0003] High-temperature gas analyzers operate in extremely harsh environments, enduring not only extremely high temperatures but also intense dust pollution. Even slight oversights in the design can lead to frequent malfunctions and extremely high on-site maintenance costs. This results in manufacturers incurring significant expenses without achieving the desired results. The main issues are as follows:

[0004] 1. Inadequate cooling system design resulted in poor cooling of the sampling probe and a short probe lifespan. There are two main types of coolant used: one is high-temperature heat transfer oil. While high-temperature heat transfer oil allows for high operating temperatures, its biggest drawback is that over time, prolonged operation at high temperatures leads to carbonization. This carbonization forms black solid carbon deposits within the cooling system, clogging the sampling probe and the cooling system, ultimately causing a significant decrease in cooling efficiency and preventing the probe from cooling down, eventually burning it out. The other type uses pure water for cooling. Water's cooling efficiency is much higher than heat transfer oil, but ordinary tap water at high temperatures can cause scaling due to calcium and magnesium ions, leading to pipe blockage and reduced cooling efficiency. In such cases, only pure water can be used. However, pure water extraction is relatively simple, resulting in significant differences in the quality of commercially available pure water. Furthermore, pure water is extremely prone to freezing at low temperatures, making it unusable in extremely cold northern climates. If the kiln needs to be shut down for maintenance or equipment failure, it cannot be restarted smoothly.

[0005] 2. Due to the high dust levels, the probe is extremely prone to clogging.

[0006] The biggest challenge with high-temperature gas analyzers is that the sampling system is very prone to clogging due to the extremely high levels of dust. The clogging of the sampling system comes from two aspects: first, the sampling probe tip is blocked due to the lack of effective dust prevention measures; second, problems with the filtration system in the sampling system can cause blockage of the heat tracing cable and the sampling tube entering the analyzer cabinet.

[0007] Many manufacturers use large-diameter solenoid valves to backflush the sampling probe to prevent clogging. The biggest problem with this method is that the interval cannot be too long. If it exceeds 15 minutes, the sampling hole is very likely to be blocked. Such frequent backflushing will shorten the effective analysis time of the system. If the system backflush time and the time it takes for the sampling pump to expel the backflush gas from the sampling system are also taken into account, the entire effective analysis time will be even shorter, and may not even reach 10 minutes. In addition, the quality of the backflush solenoid valve is also very important. If the quality is poor, the solenoid valve itself will leak air, which will affect the analysis results.

[0008] 3. The kiln tail smoke chamber is very prone to crusting, which can cause the probe to burn out in an emergency and become unable to be withdrawn.

[0009] Many manufacturers address this issue by either manually pulling out the probe at regular intervals to clean the scale buildup, or by having the control system automatically pull out the probe at regular intervals, relying on the temperature difference between the inside and outside of the flue to cause the scale to shrink, break off, and fall off. However, relying on manual scale removal would significantly increase labor costs for cement plants, clearly contradicting the concept of cost savings. The biggest drawback of using a timed automatic probe withdrawal method is that the scale may not be completely cleaned, leading to further scale buildup and posing a safety hazard. The probe tip is extremely hot when withdrawn, creating a safety risk for anyone working nearby. Besides being time-consuming and labor-intensive, both methods also disrupt the continuity of system sampling. While the probe is withdrawing, the central control operator cannot determine whether the equipment is not sampling or if there is a problem with the kiln firing system, increasing the difficulty of controlling the kiln firing system.

[0010] 4. Because the sampling probe is inserted into the smoke chamber for a long time, the working conditions are very harsh. In extreme cases (such as cooling system failure, excessively high kiln temperature, transmission system failure, etc.), the alarm system must be triggered to remove the sampling probe from the kiln and issue an alarm to alert on-site personnel to troubleshoot the fault as soon as possible. However, current products cannot fully monitor the system's operating status, and the various alarm devices are not fully set. When the equipment fails, it cannot be resolved in time, and in the end, the sampling probe is burned out, causing incalculable losses to the enterprise.

[0011] Therefore, through beneficial exploration and research, the applicant has found a solution to the above problems, and the technical solution to be introduced below is the result of this research. Utility Model Content

[0012] The technical problem to be solved by this utility model is to provide a high-temperature gas sampling system for the kiln tail flue of a cement plant, which addresses the shortcomings of the existing technology. This system aims to solve the problems of high failure rate, high maintenance cost, and high manpower investment in the current application of high-temperature gas analyzers, and to achieve long-term fully automatic and fault-free operation of the high-temperature gas analyzer.

[0013] The technical problem to be solved by this utility model can be achieved by the following technical solution:

[0014] A high-temperature gas sampling system for the kiln tail flue of a cement plant includes:

[0015] A high-temperature sampling probe, used to collect sample gas from a rotary kiln;

[0016] A transmission device is provided to drive the sampling end of the high-temperature sampling probe into or out of the rotary kiln and to drive the high-temperature sampling probe to rotate around its central axis.

[0017] The gas storage tank device serves two purposes: firstly, it provides backflush compressed air to the high-temperature sampling probe, using the backflush compressed air to perform backflush cleaning on the high-temperature sampling probe; secondly, it provides pneumatic compressed air to the transmission device to drive the transmission device to perform its operation.

[0018] A cooling device is provided for cooling the high-temperature sampling probe.

[0019] A gas analysis device, wherein the gas analysis inlet of the gas analysis device is connected to the sample gas outlet of the high-temperature sampling probe, for analyzing and processing the sample gas sampled by the high-temperature sampling probe; and

[0020] A control device is connected to the transmission device, the gas storage tank device, the cooling device, and the gas analysis device, respectively, and is used to control the coordinated operation of each device.

[0021] In a preferred embodiment of this utility model, the high-temperature sampling probe includes:

[0022] The system comprises an inner sampling tube, a middle sampling tube, and an outer sampling tube. One end of the inner sampling tube serves as a sample gas inlet, and the other end as a sample gas outlet. The middle sampling tube is fitted around the outer periphery of the inner sampling tube, and a first tubular cooling channel is formed between its inner tube surface and its outer tube surface. The first tubular cooling channel is open near the sample gas inlet and closed near the sample gas outlet. The outer sampling tube is fitted around the outer periphery of the middle sampling tube, and a second tubular cooling channel is formed between its inner tube surface and its outer tube surface. The second tubular cooling channel is closed near the sample gas inlet and communicates with the end of the first tubular cooling channel near the sample gas inlet; its end near the sample gas outlet is also closed.

[0023] The sample gas outlet connector, coolant inlet connector, and coolant outlet connector are provided. The sample gas outlet connector is installed on the sample gas outlet of the inner sampling tube and has a compressed air backflush port. The coolant inlet connector is installed on the outer sampling tube and is close to the sample gas outlet and communicates with the second tubular cooling channel. The coolant outlet connector is installed on the middle sampling tube and is close to the sample gas outlet and communicates with the first tubular cooling channel.

[0024] In a preferred embodiment of the present invention, the high-temperature sampling probe further includes a poking rod mechanism for periodically cleaning up any residue remaining in the inner sampling tube.

[0025] In a preferred embodiment of the present invention, the poking rod mechanism includes a poking rod and a poking rod driving cylinder. The poking rod is disposed inside the inner sampling tube and extends axially along the inner sampling tube. The outer diameter of the poking rod is smaller than the inner diameter of the inner sampling tube. The driving end of the poking rod driving cylinder is connected to the end of the poking rod away from the sample gas inlet, and is provided with pneumatic compressed air by the gas storage tank device.

[0026] In a preferred embodiment of this utility model, the transmission device includes:

[0027] Interval arrangement of front and rear supports;

[0028] A load-bearing guide rail is provided on the front and rear supports and located between the front and rear supports, and a rack extending along the conveying direction of the high-temperature sampling probe is provided on the load-bearing guide rail;

[0029] A transmission seat is slidably configured on the load-bearing guide rail and can reciprocate along the load-bearing guide rail. The bottom of the transmission seat is provided with several rotary bearings at intervals along the conveying direction of the high-temperature sampling probe. Each rotary bearing is fitted on the outer peripheral surface of the high-temperature sampling probe so that the high-temperature sampling probe can rotate around its central axis.

[0030] A pneumatic motor mounted on the transmission base and supplied with compressed air by the air storage tank device;

[0031] A rotating shaft with a vertical axis is mounted on the transmission base. One end of the rotating shaft is connected to the output end of the pneumatic motor through a speed reduction transmission assembly, and the other end is equipped with a transmission gear that meshes with the rack.

[0032] A rotary cylinder mounted on a front bracket and supplied with compressed pneumatic air by the air tank device for driving the high-temperature sampling probe to rotate about its central axis; and

[0033] Front and rear sensor switches, installed at the front and rear ends of the load-bearing guide rail and connected to the control device, are used to control the entry or exit position of the high-temperature sampling probe.

[0034] In a preferred embodiment of this utility model, an alarm light connected to the control device is provided on the top of the transmission seat.

[0035] In a preferred embodiment of the present invention, the transmission device includes a cable protection track, and the cable of the transmission device is arranged inside the cable protection track.

[0036] In a preferred embodiment of this utility model, the gas storage tank device includes:

[0037] The main gas storage tank has an air inlet connected to an external gas source via an electric check valve controlled by the control device. The main gas storage tank is equipped with an electric safety valve, a pressure gauge, and an automatic drain connected to the control device.

[0038] A three-way connector, wherein the air inlet of the three-way connector is connected to the air outlet of the main air tank, and its first air outlet is connected to the pneumatic motor of the transmission device via a first pneumatic triplet and a first solenoid valve controlled by the control device; and

[0039] The auxiliary air tank has its inlet end connected to the second outlet end of the three-way connector. Its first outlet end is connected to the compressed air backflush port of the high-temperature sampling probe through a first electric shut-off valve controlled by the control device. Its second outlet end is connected to the rotary cylinder of the transmission device through a flow regulating valve and a second solenoid valve controlled by the control device. Its third outlet end is connected to the poke rod drive cylinder through a second pneumatic triplet, a second electric shut-off valve, and a third solenoid valve controlled by the control device.

[0040] In a preferred embodiment of this utility model, the cooling device includes:

[0041] Coolant tank used to store coolant;

[0042] A cooler is used to cool the coolant. Its inlet end is connected to the coolant outlet connector of the high-temperature sampling probe, and its outlet end is connected to the inlet end of the coolant tank.

[0043] A cooling water pump, wherein the inlet end of the cooling water pump is connected to the outlet end of the coolant tank, and the outlet end is connected to the coolant inlet connector of the high-temperature sampling probe as a coolant outlet.

[0044] A first temperature sensor installed at the liquid inlet of the cooler and connected to the control device; and

[0045] A second temperature sensor is installed on the pipeline between the coolant tank and the coolant pump and connected to the control device.

[0046] In a preferred embodiment of this utility model, the gas analysis device includes:

[0047] A heat tracing cable, one end of which is connected to the sample gas outlet of the high-temperature sampling probe;

[0048] A sampling pump, which is controlled by the control device, has its sampling inlet connected to the other end of the heat tracing cable;

[0049] A capsule filter, the filter inlet of which is connected to the sampling outlet of the sampling pump, is used to filter the sample gas delivered by the high-temperature sampling probe to remove fine impurities from the sample gas.

[0050] The compressor condenser has its condensation inlet connected to the filter outlet of the bladder filter for condensing and draining the sample gas to remove water vapor from it.

[0051] A gas analyzer, wherein the gas analysis inlet of the gas analyzer is connected to the condensation outlet of the compressor condenser, for analyzing and processing the sample gas; and

[0052] A flow regulating valve, which is controlled by the control device, is installed on the pipeline between the gas analyzer and the compressor condenser.

[0053] In a preferred embodiment of this utility model, a humidity alarm and a flow meter connected to the control device are also provided on the pipeline between the gas analysis host and the compressor condenser.

[0054] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: This utility model realizes the intelligent and automated analysis of high temperature gas, and basically no human intervention is required in daily work. It solves the difficulties of high failure rate, high maintenance cost and large manpower investment in the current application of high temperature gas analyzers, and realizes long-term fully automatic and fault-free automatic operation of high temperature gas analyzers, which greatly saves the labor cost of cement plant equipment operation. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the high-temperature gas sampling system for the kiln tail flue of a cement plant, which is based on this utility model.

[0057] Figure 2 This is a front view of the high-temperature sampling probe of this utility model.

[0058] Figure 3 yes Figure 2 A sectional view along line AA.

[0059] Figure 4 yes Figure 3 A magnified view of section B.

[0060] Figure 5 This is a side view of the transmission device of this utility model.

[0061] Figure 6 This is a top view of the transmission device of this utility model.

[0062] Figure 7 This is a longitudinal sectional view of the transmission device of this utility model.

[0063] Figure 8 This is a structural schematic diagram of the gas storage tank device of this utility model.

[0064] Figure 9 This is a three-dimensional structural schematic diagram of the cooling device of this utility model.

[0065] Figure 10 This is a side view of the cooling device of this utility model.

[0066] Figure 11 This is a top view of the cooling device of this utility model.

[0067] Figure 12This is a schematic diagram of the gas analysis device of this utility model. Detailed Implementation

[0068] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0069] See Figure 1 The figure shows a high-temperature gas sampling system for the kiln tail flue of a cement plant, including a high-temperature sampling probe 100, a transmission device 200, a gas storage tank device 300, a cooling device 400, a gas analysis device 500, and a control device 600.

[0070] A high-temperature sampling probe 100 is used to collect sample gas from the rotary kiln 10. A transmission device 200 drives the sampling end of the high-temperature sampling probe 100 into or out of the rotary kiln and drives the high-temperature sampling probe 100 to rotate around its central axis. A gas storage tank device 300 provides backflush compressed air to the high-temperature sampling probe 100 for backflush cleaning, and also provides pneumatic compressed air to the transmission device 200 to drive its operation. A cooling device 400 cools the high-temperature sampling probe 100. The gas analysis inlet of the gas analysis device 500 is connected to the sample gas outlet of the high-temperature sampling probe 100, and is used to analyze the sample gas sampled by the high-temperature sampling probe 100. A control device 600 is connected to the transmission device 200, the gas storage tank device 300, the cooling device 400, and the gas analysis device 500, and is used to control the coordinated operation of each device.

[0071] The high-temperature sampling probe 100 is the most crucial component of the entire system. The normal operating temperature inside the kiln reaches 1400℃, and the dust content is as high as 2000g / m³. Improper design can lead to the high-temperature sampling probe 100 being burned out by the high temperature, completely deformed under prolonged high-temperature conditions, or its sampling holes becoming clogged with dust. If such a situation occurs, the entire system will malfunction. In this embodiment, the high-temperature sampling probe 100 includes an inner sampling tube 110, a middle sampling tube 120, an outer sampling tube 130, a sample gas outlet connector 140, a coolant inlet connector 150, and a coolant outlet connector 160.

[0072] One end of the inner sampling tube 110 serves as the sample gas inlet 101 of the high-temperature sampling probe 100, and the other end serves as the sample gas outlet 102 of the high-temperature sampling probe 100. The middle sampling tube 120 is fitted around the outer periphery of the inner sampling tube 110, and a first tubular cooling channel 103 is formed between its inner tube surface and the outer tube surface of the inner sampling tube 110. The end of the first tubular cooling channel 103 near the sample gas inlet 101 is open, and the end near the sample gas outlet 102 is closed. The outer sampling tube 130 is fitted around the outer periphery of the middle sampling tube 120, and a second tubular cooling channel 104 is formed between its inner tube surface and the outer tube surface of the middle sampling tube 120. The end of the second tubular cooling channel 104 near the sample gas inlet 101 is closed and communicates with the end of the first tubular cooling channel 103 near the sample gas inlet 101, while the end near the sample gas outlet 102 is closed. The sample gas outlet connector 140 is installed on the sample gas outlet 102 of the inner sampling tube 110, and a compressed air backflush port 105 is provided on it. The coolant inlet connector 150 is installed on the outer sampling tube 130 near the sample gas outlet 102 and communicates with the second tubular cooling channel 104. The coolant outlet connector 160 is installed on the middle sampling tube 120 near the sample gas outlet 102 and communicates with the first tubular cooling channel 103.

[0073] The high-temperature sampling probe 100 is mainly made of stainless steel and consists of three nested pipes. The inner sampling tube 110 is a stainless steel tube with an inner diameter of 40 mm and a wall thickness of 5 mm. It is the sampling pipe for the sample gas and is connected to the rotary kiln 10.

[0074] Due to the extremely high temperature inside the kiln, the high-temperature sampling probe 100 must be cooled by sufficient coolant during operation. The coolant enters through the coolant inlet connector 150 welded to the outer sampling tube 130, and enters the front end of the high-temperature sampling probe 100 under the guidance of the middle sampling tube 120. The main function of the middle sampling tube 120 is to allow the coolant to enter the front end of the high-temperature sampling probe 100, which is also the area with the highest temperature and the most prone to problems. After reaching the front end, the coolant will flow back along the gap between the middle sampling tube 120 and the inner sampling tube 110 under the action of the cooling water pump, and finally collect at the coolant outlet connector 160 and be discharged along the coolant outlet connector 160, thus completing the cooling process of the high-temperature sampling probe 100. Since the outer sampling tube 130 is heated the most and withstands the highest temperature, the coolant at room temperature must flow in at high speed from the outer sampling tube 130 during the cooling process to cool the tube wall of the outer sampling tube 130. The coolant that has fully absorbed the heat flows out from between the middle sampling tube 120 and the inner sampling tube 110.

[0075] Because the dust content inside the kiln is as high as 2000g / m3, some dust will inevitably be sucked into the inner sampling tube 110 of the high-temperature sampling probe 100 during sampling. If this dust is not cleaned regularly, it will clog the inner sampling tube 110. To address this, a compressed air backflush port 105 is designed at the rear end of the high-temperature sampling probe 100. This compressed air backflush port 105 is connected to an air storage tank via a pipe, and compressed air is periodically blown into the high-temperature sampling probe 100 by a solenoid valve, using the compressed air to blow the dust that falls into the pipe back into the kiln.

[0076] See Figure 8 and combined Figure 3 The high-temperature sampling probe 100 also includes a cleaning rod mechanism 170 for periodically cleaning substances trapped inside the inner sampling tube 110. Specifically, the cleaning rod mechanism 170 includes a cleaning rod 171 and a cleaning rod driving cylinder 172. The cleaning rod 171 is disposed inside the inner sampling tube 110 and extends axially along the inner sampling tube 110. The outer diameter of the cleaning rod 171 is smaller than the inner diameter of the inner sampling tube 110, facilitating the movement of the cleaning rod 171 and ensuring that the sample gas passes smoothly through the inner sampling tube 110. The driving end of the cleaning rod driving cylinder 172 is connected to the end of the cleaning rod 171 away from the sample gas inlet 101, and is supplied with compressed air by the gas storage tank device 300. This invention utilizes the cleaning rod mechanism 170 to periodically clean the high-temperature sampling probe 100, preventing blockage inside the high-temperature sampling probe 100.

[0077] See Figures 5 to 7 The transmission device 200 includes front and rear supports 210a and 210b, load-bearing guide rail 220, transmission seat 230, pneumatic motor 240, rotating shaft 250, rotating cylinder 260, and front and rear induction switches 270a and 270b.

[0078] Front and rear supports 210a and 210b are arranged at intervals on the outside of the rotary kiln 10. A load-bearing guide rail 220 is set on the front and rear supports 210a and 210b and is located between the front and rear supports 210a and 210b. A rack 221 extending along the conveying direction of the high-temperature sampling probe 100 is provided on the load-bearing guide rail 220.

[0079] The transmission base 230 is slidably mounted on the load-bearing guide rail 220 via rolling bearings 231 and can reciprocate along the load-bearing guide rail 220. Several rotary bearings 232 are spaced apart at the bottom of the transmission base 230 along the conveying direction of the high-temperature sampling probe 100. Each rotary bearing 232 is fitted on the outer circumferential surface of the high-temperature sampling probe 100 so that the high-temperature sampling probe 100 rotates around its central axis.

[0080] The pneumatic motor 240 is mounted on the transmission base 230 and is supplied with compressed air by the air tank device 300. The rotating shaft 250 is vertically mounted on the transmission base 230, one end of which is connected to the output end of the pneumatic motor 240 through the reduction transmission assembly 251, and the other end of which is equipped with a transmission gear 252 that meshes with the rack 221.

[0081] Rotary cylinder 260 is mounted on front bracket 210a and is supplied with pneumatic compressed air by air tank device 300, which is used to drive high temperature sampling probe 100 to rotate around its central axis.

[0082] Front and rear sensor switches 270a and 270b are installed at the front and rear ends of the load-bearing guide rail 220 and connected to the control device 600. They are used to control the entry or exit position of the high-temperature sampling probe 100.

[0083] An alarm light 280, connected to the control device 600, is provided on the top of the transmission base 230 to indicate the alarm status. The transmission device 200 includes a cable protection track 290, in which the cables of the transmission device 200 are arranged to protect these cables from damage.

[0084] The transmission device 200 uses a pneumatic motor 240 to drive the rotating shaft 250 to rotate forward or backward. The rotating shaft 250 drives the transmission gear 252 to rotate. Since the transmission gear 252 is engaged with the rack 221, the transmission seat 230 reciprocates along the load-bearing guide rail 220, sending the sample gas inlet of the high-temperature sampling probe 100 into or out of the rotary kiln 10. The entry or exit position of the high-temperature sampling probe 100 is controlled by front and rear induction switches 270a and 270b to ensure reliable operation.

[0085] The presence of alkaline compounds inside the kiln causes continuous "skin formation" inside the smoke chamber. This skin formation occurs when the high-temperature sampling probe 100 adheres to the kiln wall under the influence of molten cement raw materials, preventing it from moving. To prevent this, the transmission device 200 drives the high-temperature sampling probe 100 to rotate forward or backward via a rotary cylinder 260. Every 30 minutes, the probe automatically rotates 90° back and forth, ensuring that the high-temperature sampling probe 100 does not stick through continuous movement.

[0086] See Figure 8 The gas storage tank device 300 includes a main gas storage tank 310, a three-way connector 320, and a secondary gas storage tank 330.

[0087] The air inlet of the main air tank 310 is connected to an external air source through an electric check valve 311 controlled by the control device 600. The main air tank 310 is equipped with an electric safety valve 312, a pressure gauge 313 and an automatic drain 314 connected to the control device 600.

[0088] The air inlet of the three-way connector 320 is connected to the air outlet of the main air tank 310, and its first air outlet is connected to the pneumatic motor 240 of the transmission device 200 through the pneumatic triplet 312 and the solenoid valve 313 controlled by the control device 600.

[0089] The air inlet of the auxiliary air tank 330 is connected to the second air outlet of the three-way connector 320. Its first air outlet is connected to the compressed air backflush port 105 of the high-temperature sampling probe 100 through the electric shut-off valve 331 controlled by the control device 600. Its second air outlet is connected to the rotary cylinder 260 of the transmission device 200 through the flow regulating valve 332 and the solenoid valve 333 controlled by the control device 600. Its third air outlet is connected to the shovel rod drive cylinder 172 through the pneumatic triplet 334, the electric shut-off valve 335, and the solenoid valve 336 controlled by the control device 600.

[0090] The factory's main compressed air pipeline is connected to the main air tank 310. The main air tank 310's main air source is divided into two paths. One path directly supplies air to the pneumatic motor of the transmission device 200, and the other path enters the 30L auxiliary air tank 330 as the air source for the system's backflushing, rotary cylinder, and poke rod drive cylinder. When the sampling probe is in working condition, in order to remove dust from the sampling pipeline, the system automatically starts backflushing 30 minutes after each sampling. After the backflushing is completed, the solenoid valve closes, and the system enters the sampling state.

[0091] The cooling system is crucial to the entire system; its effectiveness directly impacts the lifespan of the sampling probe. (See also...) Figures 9 to 11 The cooling device 400 includes a coolant tank 410, a cooler 420, a cooling water pump 430, and temperature sensors 440a and 440b.

[0092] The coolant tank 410 is used to store coolant, and a level gauge 411 is provided on the side of the coolant tank 410.

[0093] The cooler 420 is used to cool the coolant. Its inlet end is connected to the coolant outlet connector 160 of the high-temperature sampling probe 100 as the coolant inlet, and its outlet end is connected to the inlet end of the coolant tank 410.

[0094] The inlet end of the cooling water pump 430 is connected to the outlet end of the coolant tank 410, and its outlet end is connected to the coolant inlet connector 150 of the high-temperature sampling probe 100 as the coolant outlet.

[0095] Temperature sensor 440a is installed at the inlet of cooler 420 and connected to control device 600 to collect the temperature of coolant and transmit it to control device 600 for processing.

[0096] Temperature sensor 440b is installed on the pipeline between coolant tank 410 and coolant pump 430 and connected to control device 600. It is used to collect the temperature of coolant and transmit it to control device 600 for processing.

[0097] During operation, the coolant is drawn from the coolant tank 410 by the cooling water pump 430 and rapidly cools the high-temperature sampling probe 100 through the coolant inlet connector 150. The cooled coolant then enters the cooler 420 through the coolant outlet connector 160 of the high-temperature sampling probe 100. The internal heat dissipation area of ​​the cooler 420 is as high as 120m2. Under the action of two powerful cooling fans, the temperature drops rapidly to room temperature and then flows back into the coolant tank 410. This process is repeated to cool the sampling probe.

[0098] See Figure 12 The gas analysis device 500 includes a heat tracing cable 510, a sampling pump 520, a bladder filter 530, a compressor condenser 540, a gas analysis main unit 550, and a flow control valve 560.

[0099] One end of the heat tracing cable 510 is connected to the sample gas outlet 102 of the high-temperature sampling probe 100.

[0100] The sampling pump 520 is controlled by the control device 600, and its sampling inlet is connected to the other end of the heat tracing cable 510.

[0101] The filter inlet of the capsule filter 530 is connected to the sampling outlet of the sampling pump 520 to filter the sample gas delivered by the high-temperature sampling probe 100 to remove fine impurities such as dust from the sample gas.

[0102] The condenser inlet of the compressor condenser 540 is connected to the filter outlet of the bladder filter 530 for condensing and draining the sample gas to remove water vapor from the sample gas.

[0103] The gas analysis inlet of the gas analyzer 550 is connected to the condensation outlet of the compressor condenser 540 for analyzing the sample gas. In this embodiment, the gas analyzer 550 is a Siemens U23 analyzer.

[0104] The flow regulating valve 560 is controlled by the control device 600, which is installed on the pipeline between the gas analyzer 550 and the compressor condenser 540.

[0105] A humidity alarm 570 and a flow meter 580, which are connected to the control device 600, are also installed on the pipeline between the gas analyzer 550 and the compressor condenser 540.

[0106] When the system is working, the high-temperature sampling probe 100 is inserted into the rotary kiln 10 under the push of the transmission device 200. Under the extraction of the sampling pump 520 built into the gas analyzer 500, the sample gas in the rotary kiln 10 will enter the heating cable 510 through the high-temperature sampling probe 100. In order to prevent condensation, the heating cable 510 needs to be heated to at least 120°C. The heated gas is filtered and then enters the gas analyzer 500 for water removal (the infrared gas analyzer used by the gas analyzer 500 is very sensitive to water vapor, which will interfere with the infrared characteristics of the analysis and cause problems with the analysis results). The clean sample gas after filtering water vapor and dust is sent to the gas analyzer for analysis. Generally, CO, NO and O2 need to be analyzed. These three data will be converted into corresponding 4-20mA analog quantities and displayed in the middle of the large screen of the cement plant DCS system. The data correspond to the air supply, coal injection and calcination temperature in the kiln. These data are crucial for the kiln operator to control the combustion status in the kiln.

[0107] The high-temperature gas sampling system for the kiln tail flue of this utility model is very complex, and the on-site working conditions are also very harsh. In addition, the design concept of the equipment is to achieve intelligence and automation and minimize the workload of on-site maintenance personnel. Therefore, multiple sensors are installed inside the system to achieve comprehensive monitoring of the equipment's operating status.

[0108] Temperature sensors: A temperature sensor is installed at the coolant outlet and inlet of the cooling device to detect the inlet and outlet water temperatures, respectively. If the inlet and outlet water temperatures are higher than the system set value (the system's maximum temperature set value is 80℃), the alarm system will be triggered. The on-site alarm light will beep and flash, and the cement plant's central control system will also receive an alarm signal. At the same time, the sampling probe will be withdrawn from the kiln, and the pretreatment system's display screen will show "Water temperature exceeds the standard, please troubleshoot the fault." After the fault is resolved, the alarm signal will disappear, and the system will restart.

[0109] Pressure sensor: If there is a problem with the cooling water pump or cooling pipes, the system will lose pressure. At this time, the system will also trigger an alarm. The alarm light at the site will beep and flash, and the cement plant's central control system will also receive an alarm signal. At the same time, the sampling probe will be withdrawn from the kiln, and the pretreatment system's display screen will show "Water pump pressure exceeds the standard, please check the fault". After the fault is cleared, the alarm signal will disappear, and the system will start working again.

[0110] Position sensor: When components such as rotary cylinder, pneumatic motor, and infrared sensor switch malfunction, the probe may fail to rotate, stick to the kiln wall, or become impossible to remove from the kiln. In such cases, the system will trigger an alarm, the alarm light at the site will flash, and the cement plant's central control system will also receive an alarm signal. The pretreatment system's display screen will show "Rotary cylinder malfunction, please check" or "Transmission part malfunction, please check." After the fault is resolved, the alarm signal will disappear, and the system will resume operation.

[0111] This invention realizes the intelligent and automated operation of high-temperature gas analysis, requiring virtually no human intervention in daily work. It solves the problems of high failure rate, high maintenance cost, and high manpower investment in the current application of high-temperature gas analyzers, enabling long-term fully automatic and trouble-free operation of high-temperature gas analyzers, and greatly saving the labor cost of cement plant equipment operation.

[0112] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant, characterized in that, include: A high-temperature sampling probe, used to collect sample gas from a rotary kiln; A transmission device is provided to drive the sampling end of the high-temperature sampling probe into or out of the rotary kiln and to drive the high-temperature sampling probe to rotate around its central axis. The gas storage tank device serves two purposes: firstly, it provides backflush compressed air to the high-temperature sampling probe, using the backflush compressed air to perform backflush cleaning on the high-temperature sampling probe; secondly, it provides pneumatic compressed air to the transmission device to drive the transmission device to perform its operation. A cooling device is provided for cooling the high-temperature sampling probe. A gas analysis device, wherein the gas analysis inlet of the gas analysis device is connected to the sample gas outlet of the high-temperature sampling probe, and is used to analyze and process the sample gas sampled by the high-temperature sampling probe; as well as A control device is connected to the transmission device, the gas storage tank device, the cooling device, and the gas analysis device, respectively, and is used to control the coordinated operation of each device.

2. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 1, characterized in that, The high-temperature sampling probe includes: The system comprises an inner sampling tube, a middle sampling tube, and an outer sampling tube. One end of the inner sampling tube serves as a sample gas inlet, and the other end as a sample gas outlet. The middle sampling tube is fitted around the outer periphery of the inner sampling tube, and a first tubular cooling channel is formed between its inner tube surface and its outer tube surface. The first tubular cooling channel is open near the sample gas inlet and closed near the sample gas outlet. The outer sampling tube is fitted around the outer periphery of the middle sampling tube, and a second tubular cooling channel is formed between its inner tube surface and its outer tube surface. The second tubular cooling channel is closed near the sample gas inlet and communicates with the end of the first tubular cooling channel near the sample gas inlet; its end near the sample gas outlet is also closed. The sample gas outlet connector, coolant inlet connector, and coolant outlet connector are provided. The sample gas outlet connector is installed on the sample gas outlet of the inner sampling tube and has a compressed air backflush port. The coolant inlet connector is installed on the outer sampling tube and is close to the sample gas outlet and communicates with the second tubular cooling channel. The coolant outlet connector is installed on the middle sampling tube and is close to the sample gas outlet and communicates with the first tubular cooling channel.

3. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 2, characterized in that, The high-temperature sampling probe also includes a poking rod mechanism for periodically cleaning up any residue left inside the inner sampling tube.

4. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 3, characterized in that, The poking rod mechanism includes a poking rod and a poking rod driving cylinder. The poking rod is disposed inside the inner sampling tube and extends axially along the inner sampling tube. The outer diameter of the poking rod is smaller than the inner diameter of the inner sampling tube. The driving end of the poking rod driving cylinder is connected to the end of the poking rod away from the sample gas inlet, and is provided with pneumatic compressed air by the gas storage tank device.

5. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 4, characterized in that, The transmission device includes: Interval arrangement of front and rear supports; A load-bearing guide rail is provided on the front and rear supports and located between the front and rear supports, and a rack extending along the conveying direction of the high-temperature sampling probe is provided on the load-bearing guide rail; A transmission seat is slidably configured on the load-bearing guide rail and can reciprocate along the load-bearing guide rail. The bottom of the transmission seat is provided with several rotary bearings at intervals along the conveying direction of the high-temperature sampling probe. Each rotary bearing is fitted on the outer peripheral surface of the high-temperature sampling probe so that the high-temperature sampling probe can rotate around its central axis. A pneumatic motor mounted on the transmission base and supplied with compressed air by the air storage tank device; A rotating shaft with a vertical axis is mounted on the transmission base. One end of the rotating shaft is connected to the output end of the pneumatic motor through a speed reduction transmission assembly, and the other end is equipped with a transmission gear that meshes with the rack. A rotary cylinder mounted on a front bracket and supplied with compressed pneumatic air by the air tank device for driving the high-temperature sampling probe to rotate about its central axis; and Front and rear sensor switches, installed at the front and rear ends of the load-bearing guide rail and connected to the control device, are used to control the entry or exit position of the high-temperature sampling probe.

6. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 5, characterized in that, An alarm light connected to the control device is provided on the top of the transmission base.

7. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 5, characterized in that, The transmission device includes a cable protection track, and the cable of the transmission device is arranged inside the cable protection track.

8. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 5, characterized in that, The gas storage tank device includes: The main gas storage tank has an air inlet connected to an external gas source via an electric check valve controlled by the control device. The main gas storage tank is equipped with an electric safety valve, a pressure gauge, and an automatic drain connected to the control device. A three-way connector, wherein the air inlet of the three-way connector is connected to the air outlet of the main air tank, and its first air outlet is connected to the pneumatic motor of the transmission device via a first pneumatic triplet and a first solenoid valve controlled by the control device; and The auxiliary air tank has its inlet end connected to the second outlet end of the three-way connector. Its first outlet end is connected to the compressed air backflush port of the high-temperature sampling probe through a first electric shut-off valve controlled by the control device. Its second outlet end is connected to the rotary cylinder of the transmission device through a flow regulating valve and a second solenoid valve controlled by the control device. Its third outlet end is connected to the poke rod drive cylinder through a second pneumatic triplet, a second electric shut-off valve, and a third solenoid valve controlled by the control device.

9. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 2, characterized in that, The cooling device includes: Coolant tank used to store coolant; A cooler is used to cool the coolant. Its inlet end is connected to the coolant outlet connector of the high-temperature sampling probe, and its outlet end is connected to the inlet end of the coolant tank. A cooling water pump, wherein the inlet end of the cooling water pump is connected to the outlet end of the coolant tank, and the outlet end is connected to the coolant inlet connector of the high-temperature sampling probe as a coolant outlet. A first temperature sensor installed at the liquid inlet of the cooler and connected to the control device; and A second temperature sensor is installed on the pipeline between the coolant tank and the coolant pump and connected to the control device.

10. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in any one of claims 1 to 9, characterized in that, The gas analysis device includes: A heat tracing cable, one end of which is connected to the sample gas outlet of the high-temperature sampling probe; A sampling pump, which is controlled by the control device, has its sampling inlet connected to the other end of the heat tracing cable; A capsule filter, the filter inlet of which is connected to the sampling outlet of the sampling pump, is used to filter the sample gas delivered by the high-temperature sampling probe to remove fine impurities from the sample gas. The compressor condenser has its condensation inlet connected to the filter outlet of the bladder filter for condensing and draining the sample gas to remove water vapor from it. A gas analyzer, wherein the gas analysis inlet of the gas analyzer is connected to the condensation outlet of the compressor condenser, for analyzing and processing the sample gas; and A flow regulating valve, which is controlled by the control device, is installed on the pipeline between the gas analyzer and the compressor condenser.

11. The high-temperature gas sampling system for the kiln tail flue gas chamber of a cement plant as described in claim 10, characterized in that, A humidity alarm and a flow meter connected to the control device are also installed on the pipeline between the gas analysis host and the compressor condenser.

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