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

Abstract

The invention 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. According to the invention, intelligence and automation of high-temperature gas analysis are realized.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature gas sampling equipment, and in particular to a high-temperature gas sampling system in a cement plant kiln tail smoke chamber. Background Art

[0002] Competition among cement enterprises is actually a competition of cost and quality. The lower the production cost and the better the quality of cement enterprises, the stronger the competitiveness of enterprises will be. Many enterprises have spent huge sums of money to introduce APC systems (cement plant optimization control systems) to help cement plants reduce production costs and improve product quality. In the APC system, the CO and NO generated by high temperature analysis in the kiln tail smoke chamber are X , O2 analysis data plays a very important reference role in the control of the APC system. High-temperature gas analyzers have become an indispensable and important analytical instrument in various cement plants.

[0003] Due to the extremely harsh operating environment, high temperature gas analyzers must not only withstand extremely high operating temperatures, but also withstand extremely high dust invasion. Any carelessness in the design will lead to constant failures of high temperature gas analyzers. The on-site maintenance cost is extremely high, causing manufacturers to spend huge amounts of money but fail to achieve the desired results. The main manifestations are reflected in the following points:

[0004] 1. The cooling system design is not well considered, resulting in poor cooling effect of the sampling probe and short service life of the probe. There are two main uses of coolant. One is to use high-temperature thermal oil to cool the system. High-temperature thermal oil allows a higher working temperature, but the biggest disadvantage is that over time, the thermal oil is prone to carbonization when working at high temperatures for a long time. After carbonization, black solid carbides will be generated in the cooling system. These carbides will block the sampling probe and the cooling system, and eventually cause the cooling efficiency of the cooling system to drop significantly, making it impossible to cool the probe and the probe will be burned. Another method is to use pure water for cooling. The cooling efficiency of water is much higher than that of thermal oil, but ordinary tap water will produce scaling at high temperatures due to calcium, magnesium and other ions in the water, which will eventually lead to pipe blockage and reduced cooling efficiency. In this case, only pure water can be used for cooling, but the extraction of pure water is relatively simple, which leads to a large difference in the quality of pure water sold on the market. At the same time, pure water is extremely easy to freeze at low temperatures, and it cannot be used normally in the extremely cold weather in the north. Once the kiln is stopped for maintenance or the equipment fails and needs to be stopped, the equipment cannot be started smoothly.

[0005] 2. Due to the influence of high dust, the probe is extremely easy to be blocked.

[0006] The biggest difficulty of high-temperature gas analyzers is that due to the influence of extremely high dust, the sampling system is very easy to get clogged. The clogging of the sampling system comes from two aspects. The first is that the sampling hole at the front end of the sampling probe is clogged due to the lack of effective dust prevention measures. The second is that there is a problem with the filtration system in the sampling system, which causes the heating cable and the sampling tube entering the analysis cabinet to be clogged.

[0007] Many manufacturers often use a large-caliber solenoid valve backblowing method to prevent the sampling hole at the front end of the sampling probe from being blocked. The biggest problem with this method is that the interval time cannot be too long. If it exceeds 15 minutes, there is a high probability that the sampling hole will be blocked. Such frequent backblowing will shorten the effective analysis time of the system. If the system backblowing time and the time it takes for the sampling pump to discharge the backblowing gas from the sampling system are taken into account, the entire effective analysis time will be even shorter, and the effective analysis time may not even reach 10 minutes. In addition, the quality of the backblowing solenoid valve is also very important. If the quality is poor, the solenoid valve itself will leak and affect the analysis results.

[0008] 3. The smoke chamber at the end of the kiln is very prone to crusting, which causes the probe to be unable to be withdrawn in an emergency and burns the probe.

[0009] Many manufacturers deal with this problem by manually pulling out the probe to clean the crust or by using the control system to pull the probe out automatically at a fixed time, relying on the temperature difference between the inside and outside of the smoke chamber to cause the crust to automatically shrink and break off. If the crust is cleaned manually, it will inevitably greatly increase the labor cost of the cement plant, which is obviously not in line with the concept of cost saving; if the method of automatic withdrawal of the probe is used, the biggest disadvantage is that the crust will not be cleaned cleanly and will form again later. There are also certain safety hazards. When the probe is withdrawn, the temperature at the front end of the probe is extremely high. If someone is working nearby, there are certain safety hazards. In addition to being time-consuming and labor-intensive, these two methods also have a biggest side effect, which is that the continuity of system sampling is destroyed. When the probe is withdrawing, the central control operator cannot judge whether the equipment is not sampling or there is a problem with the kiln firing system, which increases the difficulty for the operator to control the kiln firing system.

[0010] 4. The sampling probe is inserted into the smoke chamber for a long time and works in very harsh working conditions. In extreme situations (cooling system failure, high temperature in the kiln, transmission system failure, etc.), the alarm system must be triggered to allow the sampling probe to withdraw from the kiln and alarm to the outside to prompt the on-site staff to troubleshoot the fault as soon as possible. However, current products cannot fully monitor the operating status of the system, and various alarm devices are not fully set up. When equipment fails, it cannot be eliminated in time, and the sampling probe can only be burned, causing immeasurable losses to the company.

[0011] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0012] The technical problem to be solved by the present invention is: to provide a high-temperature gas sampling system for the smoke chamber of a cement plant kiln tail in view of the deficiencies in the prior art, so as to solve the difficulties of high failure rate, high maintenance cost and high manpower investment in the current application of high-temperature gas analyzers, and to realize long-term fully automatic and trouble-free operation of the high-temperature gas analyzer.

[0013] The technical problem to be solved by the present invention can be achieved by adopting the following technical solutions:

[0014] A high temperature gas sampling system for a cement plant kiln tail smoke chamber, comprising:

[0015] A high temperature sampling probe, which is used to collect sample gas in the rotary kiln;

[0016] A transmission device, the transmission device is used to drive the collection end of the high-temperature sampling probe to enter or exit the rotary kiln, and drive the high-temperature sampling probe to rotate around its central axis;

[0017] An air storage tank device, which is used to provide back-blowing compressed air for the high-temperature sampling probe on one hand, and to perform back-blowing treatment on the high-temperature sampling probe using the back-blowing compressed air, and is used to provide pneumatic compressed air for the transmission device on the other hand, so as to drive the transmission device to move;

[0018] A cooling device, wherein the cooling device is used to cool 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, and is used to analyze and process 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 various devices to work in coordination.

[0021] In a preferred embodiment of the present invention, the high temperature sampling probe comprises:

[0022] An inner sampling tube, a middle sampling tube, and an outer sampling tube, wherein one end of the inner sampling tube is a sample gas inlet, and the other end thereof is a sample gas outlet, the middle sampling tube is sleeved on the outer circumference of the inner sampling tube, and a first tubular cooling channel is formed between its inner tube surface and the outer tube surface of the inner sampling tube, the first tubular cooling channel has an open structure at one end close to the sample gas inlet, and a closed structure at one end close to the sample gas outlet, the outer sampling tube is sleeved on the outer circumference of the middle sampling tube, and a second tubular cooling channel is formed between its inner tube surface and the outer tube surface of the middle sampling tube, the second tubular cooling channel has a closed structure at one end close to the sample gas inlet and is connected with an end of the first tubular cooling channel close to the sample gas inlet, and the second tubular cooling channel has a closed structure at one end close to the sample gas outlet; and

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

[0024] In a preferred embodiment of the present invention, the high temperature sampling probe further comprises a prying rod mechanism for periodically cleaning the prying rod trapped in the inner sampling tube.

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

[0026] In a preferred embodiment of the present invention, the transmission device comprises:

[0027] Spaced front and rear brackets;

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

[0029] A transmission seat is slidably arranged on the load-bearing guide rail and can slide back and forth along the load-bearing guide rail, and a plurality of rotary bearings are arranged at intervals at the bottom of the transmission seat along the conveying direction of the high-temperature sampling probe, and each rotary bearing is sleeved on the outer peripheral surface of the high-temperature sampling probe to enable the high-temperature sampling probe to rotate around its central axis;

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

[0031] A rotating shaft with a vertical axis disposed on the transmission seat, one end of the rotating shaft is connected to the output end of the pneumatic motor through a reduction transmission assembly, and the other end of the rotating shaft is provided with a transmission gear meshing with the rack;

[0032] A rotary cylinder installed on the front bracket and provided with pneumatic compressed air by the air storage tank device for driving the high-temperature sampling probe to rotate around its central axis; and

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

[0034] In a preferred embodiment of the present invention, 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 comprises a cable protection track, and the cables of the transmission device are arranged in the cable protection track.

[0036] In a preferred embodiment of the present invention, the gas storage tank device comprises:

[0037] A main gas storage tank, the gas inlet end of which is connected to an external gas source via an electric one-way valve controlled by the control device, and the main gas storage tank is provided with an electric safety valve, a pressure gauge and an automatic drainer connected to the control device;

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

[0039] Auxiliary air storage tank, the air inlet end of the auxiliary air storage tank is connected to the second air outlet end of the three-way joint, the first air outlet end is connected to the compressed air backblowing port of the high-temperature sampling probe through the first electric stop valve controlled by the control device, the second air outlet end is connected to the rotating cylinder of the transmission device through the flow regulating valve and the second solenoid valve controlled by the control device, and the third air outlet end is connected to the poke rod driving cylinder through the second pneumatic triplet, the second electric stop valve and the third solenoid valve controlled by the control device.

[0040] In a preferred embodiment of the present invention, the cooling device comprises:

[0041] A coolant tank for storing coolant;

[0042] A cooler, the cooler is used to cool the coolant, the liquid inlet end of the coolant is connected to the coolant outlet joint of the high-temperature sampling probe as the coolant inlet, and the liquid outlet end of the coolant is connected to the liquid inlet end of the coolant water tank;

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

[0044] a first temperature sensor installed at the liquid inlet end 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 cooling water pump and connected to the control device.

[0046] In a preferred embodiment of the present invention, the gas analysis device comprises:

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

[0048] A sampling pump, the sampling pump is controlled by the control device, and the sampling inlet of the sampling pump is connected to the other end of the heating pipe cable;

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

[0050] A compressor condenser, wherein the condensation inlet of the compressor condenser is connected to the filter outlet of the capsule filter, and is used for condensing and draining the sample gas to remove water vapor in the sample gas;

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

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

[0053] In a preferred embodiment of the present invention, 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 scheme, the beneficial effects of the present invention are: the present invention realizes the intelligence and automation of high-temperature gas analysis, basically does not require human participation in daily work, solves the difficulties of high failure rate, high maintenance cost and high manpower investment in the current application of high-temperature gas analyzers, and realizes long-term fully automatic and trouble-free operation of high-temperature gas analyzers, which greatly saves the labor cost of cement plant equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 It is a structural schematic diagram of a high-temperature gas sampling system for a cement plant kiln tail smoke chamber of the present invention.

[0057] Figure 2 It is a front view of the high temperature sampling probe of the present invention.

[0058] Figure 3 yes Figure 2 AA section view.

[0059] Figure 4 yes Figure 3 A partial enlarged view of point B.

[0060] Figure 5 It is a side view of the transmission device of the present invention.

[0061] Figure 6 It is a top view of the transmission device of the present invention.

[0062] Figure 7 It is a longitudinal sectional view of the transmission device of the present invention.

[0063] Figure 8 It is a structural schematic diagram of the gas storage tank device of the present invention.

[0064] Fig. 9 It is a schematic diagram of the three-dimensional structure of the cooling device of the present invention.

[0065] Fig.10 It is a side view of the cooling device of the present invention.

[0066] Fig.11 It is a top view of the cooling device of the present invention.

[0067] Fig.12 It is a schematic structural diagram of the gas analysis device of the present invention. DETAILED DESCRIPTION

[0068] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0069] See also Figure 1 The figure shows a high-temperature gas sampling system for a cement plant kiln tail smoke chamber, 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] The high temperature sampling probe 100 is used to collect the sample gas in the rotary kiln 10. The transmission device 200 is used to drive the collection end of the high temperature sampling probe 100 to enter or exit the rotary kiln, and drive the high temperature sampling probe 100 to rotate around its central axis. The gas storage tank device 300 is used to provide back-blowing compressed air for the high temperature sampling probe 100, and use the back-blowing compressed air to back-blow the high temperature sampling probe 100, and on the other hand, it is used to provide pneumatic compressed air for the transmission device 200 to drive the transmission device 200 to operate. The cooling device 400 is used to cool 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 and process the sample gas sampled by the high temperature sampling probe 100. The control device 600 is respectively 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 work of each device.

[0071] The high temperature sampling probe 100 is the most important part of the whole system. The normal working temperature in the kiln is as high as 1400°C and the dust content is as high as 2000g / m3. If the design is unreasonable, the high temperature sampling probe 100 will be burned by high temperature or completely deformed under long-term high temperature conditions or the sampling hole will be blocked by high dust. Once this happens, the whole system will not work. 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 is the sample gas inlet 101 of the high temperature sampling probe 100, and the other end thereof is the sample gas outlet 102 of the high temperature sampling probe 100. The middle sampling tube 120 is sleeved on the outer circumference 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 close to the sample gas inlet 101 is an open structure, and the end close to the sample gas outlet 102 is a closed structure. The outer sampling tube 130 is sleeved on the outer circumference 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 close to the sample gas inlet 101 is a closed structure and communicates with the end of the first tubular cooling channel 103 close to the sample gas inlet 101, and the end close to the sample gas outlet 102 is a closed structure. The sample gas outlet connector 140 is installed on the sample gas outlet 102 of the inner sampling tube 110, and is provided with a compressed air backflush port 105. The coolant inlet connector 150 is installed on the outer sampling tube 130, close to the sample gas outlet 102 and connected to the second tubular cooling channel 104. The coolant outlet connector 160 is installed on the middle sampling tube 120, close to the sample gas outlet 102 and connected to the first tubular cooling channel 103.

[0073] The main material of the high temperature sampling probe 100 is made of stainless steel, and it is composed of three layers of pipes nested each other. The inner sampling pipe 110 is a stainless steel pipe with an inner diameter of 40 mm and a wall thickness of 5 mm. It is a sample gas collection pipe, and this pipe is connected to the rotary kiln 10.

[0074] Since the temperature in the kiln is extremely high, the high-temperature sampling probe 100 must be cooled by sufficient coolant when working. The coolant enters from the coolant inlet joint 150 welded on 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. The front end is also the area with the highest temperature and the part most prone to problems. After the coolant reaches the front end, it will reflux 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 gather at the coolant outlet joint 160, and be discharged along the coolant outlet joint 160, completing the cooling process of the high-temperature sampling probe 100. Since the outer sampling tube 130 is subjected to the greatest heat and withstands the highest temperature, during the cooling process, the coolant at room temperature must flow into the outer sampling tube 130 at a high speed 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] Since the dust content in the kiln is as high as 2000g / m3, some dust will be sucked into the inner sampling tube 110 of the high-temperature sampling probe 100 during sampling. If the dust is not cleaned regularly, it will block the inner sampling tube 110. For this reason, a compressed air backflush port 105 is designed at the rear end of the high-temperature sampling probe 100. The compressed air backflush port 105 is connected to the air storage tank device through a pipeline, and compressed air is regularly blown into the high-temperature sampling probe 100 through the control of the solenoid valve, and the dust falling in the pipeline is blown back into the kiln by the compressed air.

[0076] See also Figure 8 Combined with Figure 3 The high-temperature sampling probe 100 also includes a poke rod mechanism 170 for regularly cleaning the poke rod trapped in the inner sampling tube 110. Specifically, the poke rod mechanism 170 includes a poke rod 171 and a poke rod driving cylinder 172. The poke rod 171 is arranged in the inner sampling tube 110 and extends axially along the inner sampling tube 110. The outer diameter of the poke rod 171 is smaller than the inner diameter of the inner sampling tube 110, which facilitates the movement of the poke rod 171 and ensures that the sample gas passes through the inner sampling tube 110 smoothly. The driving end of the poke rod driving cylinder 172 is connected to the end of the poke rod 171 away from the sample gas inlet 101, and pneumatic compressed air is provided by the gas storage tank device 300. The present invention uses the poke rod mechanism 170 to regularly clean the high-temperature sampling probe 100 to prevent internal blockage of the high-temperature sampling probe 100.

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

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

[0079] The transmission seat 230 is slidably arranged on the load-bearing guide rail 220 through a rolling bearing 231 and can slide back and forth along the load-bearing guide rail 220. A plurality of rotating bearings 232 are arranged at intervals at the bottom of the transmission seat 230 along the conveying direction of the high-temperature sampling probe 100. Each rotating bearing 232 is sleeved on the outer peripheral surface of the high-temperature sampling probe 100 so that the high-temperature sampling probe 100 can rotate around its central axis.

[0080] The pneumatic motor 240 is mounted on the transmission base 230 and is provided with pneumatic compressed air by the air tank device 300. The rotating shaft 250 is vertically arranged 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 meshing with the rack 221.

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

[0082] The front and rear sensing switches 270 a and 270 b are installed at the front and rear ends of the load-bearing guide rail 220 and are connected to the control device 600 , and 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 seat 230 to display the alarm state. The transmission device 200 includes a cable protection track 290, in which the cables of the transmission device 200 are arranged, and the cable protection track 290 is used to protect the cables to avoid cable damage.

[0084] The transmission device 200 uses the pneumatic motor 240 to drive the rotating shaft 250 to rotate forward or reverse, and the rotating shaft 250 drives the transmission gear 252 to rotate. Since the transmission gear 252 is in meshing state with the rack 221, the transmission seat 230 reciprocates along the load-bearing guide rail 220, and the sample gas inlet of the high-temperature sampling probe 100 is sent into the rotary kiln 10 or withdraws from the rotary kiln 10. The front and rear induction switches 270a and 270b are used to control the entry or exit position of the high-temperature sampling probe 100 to ensure the reliability of movement.

[0085] The presence of alkaline compounds in the kiln will cause continuous "skinning" inside the smoke chamber. The skinning phenomenon is that the high-temperature sampling probe 100 will adhere to the kiln wall under the action of molten cement raw materials, making the high-temperature sampling probe 100 and the kiln wall stick together and unable to move. In order to prevent this phenomenon from occurring, the transmission device 200 drives the high-temperature sampling probe 100 to rotate forward or reverse through the rotating cylinder 260. Every 30 minutes, the probe automatically rotates back and forth 90°, and the high-temperature sampling probe 100 is ensured not to stick through continuous movement.

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

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

[0088] The air inlet end of the three-way joint 320 is connected to the air outlet end of the main air tank 310 , and the first air outlet end thereof 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 end of the auxiliary air storage tank 330 is connected to the second air outlet end of the three-way joint 320, and its first air outlet end is connected to the compressed air backblowing port 105 of the high-temperature sampling probe 100 through an electric stop valve 331 controlled by the control device 600, and its second air outlet end is connected to the rotating cylinder 260 of the transmission device 200 through a flow regulating valve 332 and an electromagnetic valve 333 controlled by the control device 600, and its third air outlet end is connected to the poke rod driving cylinder 172 through a pneumatic triplet 334, an electric stop valve 335, and an electromagnetic 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 total air source of the main air tank 310 is divided into two routes. One route directly supplies air to the pneumatic motor of the transmission device 200, and the other route enters the 30L auxiliary air tank 330 as the air source for the system's backblowing, rotating cylinder, and poke rod driving cylinder. When the sampling probe is in working condition, in order to remove dust in the sampling pipeline, the system automatically starts backblowing after 30 minutes of each sampling. After the backblowing is completed, the solenoid valve is closed and the system enters the sampling state.

[0091] The cooling system is very important for the whole system. The cooling effect directly affects the service life of the sampling probe. 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, 440b.

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

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

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

[0095] The temperature sensor 440a is installed at the liquid inlet end of the cooler 420 and is connected to the control device 600, and is used to collect the temperature of the cooling liquid and transmit it to the control device 600 for processing.

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

[0097] During operation, the coolant is pumped out of the coolant tank 410 by the cooling water pump 430, and the high-temperature sampling probe 100 is quickly cooled along the coolant inlet connector 150 of the high-temperature sampling probe 100. The cooled coolant enters the cooler 420 from 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 quickly drops to room temperature and then flows back into the coolant tank 410, and the sampling probe is cooled repeatedly.

[0098] See also Fig.12 The gas analysis device 500 includes a heating cable 510 , a sampling pump 520 , a capsule filter 530 , a compressor condenser 540 , a gas analysis host 550 and a flow regulating valve 560 .

[0099] One end of the heating 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 the sampling inlet of the sampling pump 520 is connected to the other end of the heating pipe cable 510 .

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

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

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

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

[0105] A humidity alarm 570 and a flow meter 580 connected to the control device 600 are also provided on the pipeline between the gas analysis host 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 in the gas analysis device 500, the sample gas in the rotary kiln 10 will pass through the high temperature sampling probe 100 and enter the heating cable 510. In order to prevent the precipitation of condensed water, the heating cable 510 needs to be heated to at least 120°C. The heated gas is filtered and enters the gas analysis device 500 for dehydration (the infrared gas analyzer used in the gas analysis device 500 is very sensitive to water vapor, which will interfere with the infrared characteristics of the analysis, resulting in problems with the analysis results). The clean sample gas that has been filtered of 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 volume, coal injection volume, and firing temperature in the kiln. These data are crucial for the kiln operator to control the combustion conditions in the kiln.

[0107] The high-temperature gas sampling system of the cement plant kiln tail smoke chamber of the present invention is very complex, and the working conditions on site are also very harsh. In addition, the design idea of ​​the equipment is to achieve intelligence and automation to minimize the workload of on-site maintenance personnel. Therefore, multiple sensors must be installed inside the system to achieve all-round monitoring of the operating status of the equipment.

[0108] Temperature sensor: 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 maximum temperature setting value is 80°C), the alarm system will be triggered, the on-site alarm light will buzz and flash, the cement plant central control will also receive the alarm signal, and the sampling probe will withdraw from the kiln. The display screen of the pretreatment system will display "Water temperature exceeds the standard, please check the fault". After the fault is eliminated, the alarm signal disappears and the system starts working again.

[0109] Pressure sensor: If there is a problem with the cooling water pump or cooling pipe, the system will lose pressure. At this time, the system will also trigger the alarm. The alarm light on the scene will buzz and flash, and the cement plant central control will also receive the alarm signal. At the same time, the sampling probe will withdraw from the kiln, and the display screen of the pretreatment system will display "Water pump pressure exceeds the standard, please check the fault". After the fault is eliminated, the alarm signal disappears and the system starts working again.

[0110] Position sensor: When there are problems with the rotating cylinder, pneumatic motor, infrared sensor switch and other components, the probe will not be able to rotate and will stick to the kiln wall or the probe cannot be pulled out of the kiln. At this time, the system will trigger the alarm, the alarm light on the scene will buzz and flash, the cement plant central control will also receive the alarm signal, and the display screen of the pretreatment system will display "Please check the rotating cylinder fault" or "Please check the transmission part fault". After the fault is eliminated, the alarm signal disappears and the system starts working again.

[0111] The present invention realizes the intelligence and automation of high-temperature gas analysis, and basically does not require human participation in daily work. It solves the difficulties of high failure rate, high maintenance cost and high manpower investment in the current application of high-temperature gas analyzers, and realizes long-term fully automatic and trouble-free operation of high-temperature gas analyzers, which greatly saves the labor cost of cement plant equipment operation.

[0112] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high temperature gas sampling system for the smoke chamber of a cement plant kiln, characterized in that: include: A high temperature sampling probe, which is used to collect sample gas in the rotary kiln; A transmission device, the transmission device is used to drive the collection end of the high-temperature sampling probe to enter or exit the rotary kiln, and drive the high-temperature sampling probe to rotate around its central axis; An air storage tank device, which is used to provide back-blowing compressed air for the high-temperature sampling probe on one hand, and to perform back-blowing treatment on the high-temperature sampling probe using the back-blowing compressed air, and is used to provide pneumatic compressed air for the transmission device on the other hand, so as to drive the transmission device to move; A cooling device, wherein the cooling device is used to cool 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 various devices to work in coordination.

2. The high temperature gas sampling system for the tail smoke chamber of a cement plant kiln as claimed in claim 1, characterized in that: The high temperature sampling probe comprises: An inner sampling tube, a middle sampling tube, and an outer sampling tube, wherein one end of the inner sampling tube is a sample gas inlet, and the other end thereof is a sample gas outlet, the middle sampling tube is sleeved on the outer circumference of the inner sampling tube, and a first tubular cooling channel is formed between its inner tube surface and the outer tube surface of the inner sampling tube, the first tubular cooling channel has an open structure at one end close to the sample gas inlet, and a closed structure at one end close to the sample gas outlet, the outer sampling tube is sleeved on the outer circumference of the middle sampling tube, and a second tubular cooling channel is formed between its inner tube surface and the outer tube surface of the middle sampling tube, the second tubular cooling channel has a closed structure at one end close to the sample gas inlet and is connected with an end of the first tubular cooling channel close to the sample gas inlet, and the second tubular cooling channel has a closed structure at one end close to the sample gas outlet; and A sample gas outlet joint, a coolant inlet joint, and a coolant outlet joint. The sample gas outlet joint is installed on the sample gas outlet of the inner sampling tube, and is provided with a compressed air backflush port. The coolant inlet joint is installed on the outer sampling tube and is close to the sample gas outlet and is connected to the second tubular cooling channel. The coolant outlet joint is installed on the middle sampling tube and is close to the sample gas outlet and is connected to the first tubular cooling channel.

3. The high temperature gas sampling system for the tail smoke chamber of a cement plant as claimed in claim 2, characterized in that: The high temperature sampling probe also includes a poke rod mechanism for regularly cleaning the poke rod trapped in the inner sampling tube.

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

5. The high temperature gas sampling system for the tail smoke chamber of a cement plant kiln as claimed in claim 2, characterized in that: The transmission device comprises: Spaced front and rear brackets; A load-bearing guide rail disposed on the front and rear brackets and located between the front and rear brackets, wherein the load-bearing guide rail is provided with a rack extending along the conveying direction of the high-temperature sampling probe; A transmission seat is slidably arranged on the load-bearing guide rail and can slide back and forth along the load-bearing guide rail, and a plurality of rotary bearings are arranged at intervals at the bottom of the transmission seat along the conveying direction of the high-temperature sampling probe, and each rotary bearing is sleeved on the outer peripheral surface of the high-temperature sampling probe to enable the high-temperature sampling probe to rotate around its central axis; A pneumatic motor mounted on the transmission seat and provided with pneumatic compressed air by the air storage tank device; A rotating shaft with a vertical axis disposed on the transmission seat, one end of the rotating shaft is connected to the output end of the pneumatic motor through a reduction transmission assembly, and the other end of the rotating shaft is provided with a transmission gear meshing with the rack; A rotary cylinder installed on the front bracket and provided with pneumatic compressed air by the air storage tank device for driving the high-temperature sampling probe to rotate around its central axis; and Front and rear sensing switches installed at the front and rear ends of the load-bearing guide rail and connected to the control device for controlling the entry or exit position of the high-temperature sampling probe.

6. The high temperature gas sampling system for the tail smoke chamber of a cement plant as claimed in claim 5, characterized in that: An alarm light connected to the control device is arranged on the top of the transmission seat.

7. The high temperature gas sampling system for the smoke chamber of a cement plant kiln as claimed in claim 5, characterized in that: The transmission device comprises a cable protection track, and the cables of the transmission device are arranged in the cable protection track.

8. The high temperature gas sampling system for the tail smoke chamber of a cement plant as claimed in claim 5, characterized in that: The gas storage tank device comprises: A main gas storage tank, the gas inlet end of which is connected to an external gas source via an electric one-way valve controlled by the control device, and the main gas storage tank is provided with an electric safety valve, a pressure gauge and an automatic drainer connected to the control device; A three-way joint, the air inlet end of the three-way joint is connected to the air outlet end of the main air storage tank, and the first air outlet end is connected to the pneumatic motor of the transmission device through a first pneumatic triplet and a first solenoid valve controlled by the control device; and Auxiliary air storage tank, the air inlet end of the auxiliary air storage tank is connected to the second air outlet end of the three-way joint, the first air outlet end is connected to the compressed air backblowing port of the high-temperature sampling probe through the first electric stop valve controlled by the control device, the second air outlet end is connected to the rotating cylinder of the transmission device through the flow regulating valve and the second solenoid valve controlled by the control device, and the third air outlet end is connected to the poke rod driving cylinder through the second pneumatic triplet, the second electric stop valve and the third solenoid valve controlled by the control device.

9. The high temperature gas sampling system for the tail smoke chamber of a cement plant kiln as claimed in claim 2, characterized in that: The cooling device comprises: A coolant tank for storing coolant; A cooler, the cooler is used to cool the coolant, the liquid inlet end of the coolant is connected to the coolant outlet joint of the high-temperature sampling probe as the coolant inlet, and the liquid outlet end of the coolant is connected to the liquid inlet end of the coolant water tank; A cooling water pump, wherein the liquid inlet end of the cooling water pump is connected to the liquid outlet end of the coolant water tank, and the liquid outlet end of the cooling water pump is connected to the coolant inlet joint of the high-temperature sampling probe as a coolant outlet; a first temperature sensor installed at the liquid inlet end 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 cooling water pump and connected to the control device.

10. The high temperature gas sampling system of the cement plant kiln tail smoke chamber according to any one of claims 1 to 9, characterized in that: The gas analysis device comprises: A heating pipe cable, one end of which is connected to the sample gas outlet of the high-temperature sampling probe; A sampling pump, the sampling pump is controlled by the control device, and the sampling inlet of the sampling pump is connected to the other end of the heating pipe cable; A capsule filter, the filter inlet of which is connected to the sampling outlet of the sampling pump, and is used to filter the sample gas delivered by the high-temperature collection probe to remove fine impurities in the sample gas; A compressor condenser, wherein the condensation inlet of the compressor condenser is connected to the filter outlet of the capsule filter, and is used for condensing and draining the sample gas to remove water vapor in the sample gas; A gas analysis host, the gas analysis inlet of the gas analysis host is connected to the condensation outlet of the compressor condenser, and is used for analyzing and processing the sample gas; and A flow regulating valve, which is controlled by the control device and installed on the pipeline between the gas analysis host and the compressor condenser.

11. The high temperature gas sampling system for the tail smoke chamber of a cement plant as claimed in claim 10, characterized in that: 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.

Images