A collection device and operation method for improving the representativeness of high temperature sample gas components for cement kiln analysis

Abstract

The present invention discloses a collection device for improving the representativeness of high-temperature sample gas components for cement kiln analysis, comprising a sampling probe installed near the sealing port at the tail of a rotary kiln, the sealing port of the rotary kiln is provided with a mechanical sealing ring, a sampling hole is provided near the mechanical sealing ring, the sampling probe passes through the sampling hole to enter the interior of the rotary kiln for sampling, and the sampling probe is also provided with: a cooling water supply and drainage pipeline for cooling the sampling probe, and a washing water supply pipeline for washing and dust removal at the front end of the sampling probe. The collection device for improving the representativeness of high-temperature sample gas components for cement kiln analysis moves the sampling point to the kiln mouth at the tail of the kiln, passes the probe through the kiln mouth sealing ring, inserts it into the kiln, and changes the fixed installation into an automatic push-pull mode. In this way, the purpose of collecting flue gas samples for a long time, continuously, and without distortion can be achieved, and the representativeness of the flue gas component samples is fundamentally guaranteed. The present invention also discloses an operation method of the collection device.

Description

Technical Field

[0001] The invention relates to a collection device for representative high-temperature sample gas components for cement kiln tail analysis, and in particular to a collection device for improving representative high-temperature sample gas components for cement kiln analysis and an operation method thereof. Background Art

[0002] The current reality of flue gas sampling in the harsh environment of high temperature, high dust and so on at the tail of cement kiln is that although the mechanical seal at the tail of domestic cement kiln has been improved for two or three decades, the effect has not been obvious. In addition, due to the life cycle of the equipment, air leakage has not been solved.

[0003] In the dry sampling flue gas analysis device, there is a push-pull sampling probe for analyzing the high-temperature and high-dust exhaust gas composition at the end of the cement kiln. Because it cannot block the excessive dust and high temperature exceeding 1100 degrees in the sampling point, it is necessary to stop gas collection and start compressed air backflush once every 3 minutes, and then continue the cycle of gas collection and backflush; at the same time, about 35% of the NO in the sample gas system will be oxidized into NO2, which causes the sample gas taken by dry sampling to lose its representativeness. Therefore, even though the dry sampling probe can extend through the kiln sealing ring, the analysis results are not representative. The representativeness mentioned here refers to the authenticity of the exhaust gas composition data of the cement kiln tail obtained by the analysis of the analytical instrument.

[0004] The inventor invented the gas analysis device (02238231.3) using wet sampling, the wet gas pretreatment device (00250648.3), the high temperature probe (02253663.9) and other technologies and products, which can effectively remove dust, withstand high temperatures, and continuously collect high temperature flue gas samples from cement kiln tails online for a long time without distortion, making great contributions to energy conservation and emission reduction of cement kilns. However, the wet probe is currently mainly fixedly installed, and cannot avoid the interference of air leakage, which distorts the flue gas composition, especially the O2 data.

[0005] In order to cooperate with the sample gas collection of the high-temperature exhaust gas composition analysis module at the tail of the cement kiln in the "Real-time quantitative monitoring method for energy conservation and emission reduction of dry cement production line" (patent number: 200910008913.7)" and "A refined management method for optimizing cement clinker production process" (patent application number: 201811568698.1) invented by the inventor, this technical solution is specially proposed. Summary of the invention

[0006] One object of the present invention is to provide a collection device for improving the representativeness of high temperature sample gas components for cement kiln analysis. Another object of the present invention is to provide an operation method of the collection device.

[0007] According to one aspect of the present invention, a collection device for improving the representativeness of high-temperature sample gas components for cement kiln analysis is provided, comprising a sampling probe installed near the sealing port of the rotary kiln tail, the rotary kiln tail sealing port is provided with a mechanical sealing ring, and a sampling hole is provided near the mechanical sealing ring. The sampling probe passes through the sampling hole and enters the rotary kiln for sampling. The sampling probe is also provided with:

[0008] Cooling water supply and drainage pipelines for cooling the sampling probe,

[0009] and a washing water supply pipeline for flushing and dust removal of the sampling probe.

[0010] In some embodiments, the cooling water supply and drainage pipe and the washing water supply pipe are respectively connected to the external water supply pipe.

[0011] In some embodiments, the sampling probe is connected to a sampling drive device, and driven by the sampling drive device, passes through the sampling hole and the sealing port at the tail of the rotary kiln to enter the rotary kiln for sampling.

[0012] In some embodiments, the sampling drive device includes a bracket and a probe push-pull mechanism connected to the bracket, the sampling probe is fixedly connected to the bracket, and the probe push-pull mechanism is used to drive the bracket to drive the sampling probe to move forward and backward.

[0013] In some embodiments, the probe push-pull mechanism is a motor, a cylinder, a pneumatic cylinder, or a screw propulsion mechanism.

[0014] In some embodiments, the probe push-pull mechanism is connected to a PLC controller, and the PLC controller is used to control the forward and backward translation of the probe push-pull mechanism.

[0015] In some embodiments, a sample gas outlet is provided at the rear end of the sampling probe, and the sample gas outlet is connected to a gas-water separator.

[0016] In some embodiments, the inlet side of the steam-water separator is connected to the sample gas outlet, and the outlet side is connected to the filter device. The outlet side of the filter device is provided with a sample gas output port, and the sample gas output port is connected to the analytical instrument.

[0017] In some embodiments, the filter device includes a primary filter device and a secondary filter device, the primary filter device and the secondary filter device are connected in series, and the sample gas output port is arranged on one side of the outlet of the secondary filter device.

[0018] In some embodiments, the secondary filtration device is a paper filter.

[0019] According to another aspect of the present invention, there is provided a method for operating a collection device for improving the representativeness of high temperature gas components for cement kiln analysis, comprising the following steps:

[0020] (1) Connect the cooling water supply and drainage pipes so that cooling water enters the sampling probe to cool the sampling probe;

[0021] (2) The sampling drive device drives the sampling probe to enter through the sampling hole to perform sampling;

[0022] (3) Under the control of the PLC controller, when the set time is reached or the water or power outage alarm is triggered, the sampling drive device automatically drives the sampling probe to withdraw from the sampling hole near the sealing port at the tail of the rotary kiln until it returns to the initial position; and under the control of the PLC controller, when the set time is reached or the alarm is released, the sampling drive device automatically drives the sampling probe to extend through the sampling hole into the sampling hole near the sealing port at the tail of the rotary kiln, return to the sampling position in the kiln, and continue to collect sample gas.

[0023] (4) Connect the washing water supply pipeline and use the washing water to rinse and remove dust from the sampling probe.

[0024] The above technical solution is used to improve the representativeness of the high-temperature sample gas composition collection device for cement kiln analysis. By improving the collection device of the high-temperature gas composition of the cement rotary kiln, while maintaining the advantages of the wet sampling probe in long-term continuous and distortion-free sample gas collection method, the sampling point is moved to the vicinity of the kiln tail and kiln mouth, and the fixed installation is changed to an automatic push-pull method. This can achieve the purpose of long-term, continuous and distortion-free collection of flue gas samples, thereby fundamentally ensuring the representativeness of the flue gas composition samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a collection device for improving the representativeness of high-temperature sample gas components for cement kiln analysis according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail from two aspects of static characteristics and dynamic characteristics in conjunction with the accompanying drawings.

[0027] 1. Static characteristics:

[0028] Figure 1 A collection device for improving the representativeness of high-temperature sample gas components for cement kiln analysis according to an embodiment of the present invention is schematically shown.

[0029] As shown in the figure, the device includes a sampling probe 3 installed near the sealing port of the rotary kiln 14.

[0030] Among them, the sealing opening of the rotary kiln 14 is provided with a mechanical sealing ring 6.

[0031] A sampling hole 7 is provided near the mechanical seal ring 6 .

[0032] The sampling probe 3 passes through the sampling hole 7 and enters the rotary kiln 14 to take samples.

[0033] The sampling hole 7 is an elastic sealing hole, that is, it is normally closed. When the sampling probe 3 is inserted, it is sealed and connected to the side wall of the sampling probe 3 and allows the sampling probe 3 to pass through. When the sampling probe 3 is withdrawn, the sampling hole 7 elastically resets and returns to the sealed state.

[0034] The sampling probe 3 is also provided with:

[0035] A cooling water supply and drainage pipeline 1 for cooling the sampling probe 3,

[0036] And, a washing water supply pipeline 2 for flushing and dust removal of the sampling probe 3.

[0037] The cooling water supply and drainage pipe 1 and the washing water supply pipe 2 are respectively connected to the external water supply pipe.

[0038] The sampling probe 3 is connected to a sampling driving device, and driven by the sampling driving device, enters the sealed port of the rotary kiln 14 through the sampling hole 7 to perform sampling.

[0039] The sampling drive device includes a bracket 4 and a probe push-pull mechanism 5 connected to the bracket 4. The sampling probe 3 is fixedly connected to the bracket 4. The probe push-pull mechanism 5 is used to drive the bracket 4 to drive the sampling probe 3 to move forward and backward.

[0040] The probe push-pull mechanism 5 can be a motor, a cylinder, or a gas cylinder or a screw propulsion mechanism.

[0041] In this embodiment, the probe push-pull mechanism 5 is connected to a PLC controller 13 .

[0042] The PLC controller 13 is used to control the forward and backward translation of the probe push-pull mechanism 5 .

[0043] In this embodiment, a sample gas outlet 8 is provided at the rear end of the sampling probe 3 , and the sample gas outlet 8 is connected to a steam-water separator 9 .

[0044] The inlet side of the steam-water separator 9 is connected to the sample gas outlet 8, and the outlet side is connected to the filtering device.

[0045] A sample gas outlet 12 is provided on one side of the filter outlet.

[0046] The sample gas output port 12 is connected to an analytical instrument.

[0047] Specifically, the filtering device comprises a primary filtering device 10 and a secondary filtering device 11 , which are connected in series in sequence, and the sample gas output port 12 is arranged at one side of the outlet of the secondary filtering device 11 .

[0048] Preferably, the secondary filter device 11 is a paper filter.

[0049] 2. Dynamic characteristics

[0050] (1) Connect the cooling water supply and drainage pipe 1, and the cooling water enters the sampling probe 3 to cool the sampling probe 3;

[0051] (2) The PLC controller 13 controls the probe push-pull mechanism 5 to extend forward, and the drive bracket 4 drives the sampling probe 3 to enter the sealed port of the rotary kiln 14 through the sampling hole 7 for sampling. The sample gas collected by the sampling probe 3 enters the steam-water separator 9 through the sample gas outlet 8, and then is filtered through the primary filter 10 and the secondary paper filter 11, and finally outputted from the sample gas outlet 12 to the analytical instrument for component analysis;

[0052] (3) Under the control of the PLC controller 13, the sampling drive device 5 automatically drives the sampling probe 3 to pass through the sampling hole 7 near the rotary kiln tail sealing port 14 and withdraws until it returns to the initial position when the set time is reached or the water or power outage alarm is triggered; and under the control of the PLC controller 13, the sampling drive device 5 automatically drives the sampling probe 3 to extend through the sampling hole 7 and return to the sampling position in the kiln to continue collecting sample gas when the set time is reached or the alarm is released.

[0053] (4) Connect the washing water supply pipe 2, and use the washing water to rinse the sampling probe 3, thereby completing the dust removal at the front end of the sampling probe 3 by spraying water.

[0054] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A collection device for improving the representativeness of high temperature sample gas components for cement kiln analysis, characterized in that: It includes a sampling probe installed near the sealing port of the rotary kiln tail, the sealing port of the rotary kiln tail is provided with a mechanical sealing ring, and a sampling hole is provided near the mechanical sealing ring. The sampling probe passes through the sampling hole and enters the interior of the rotary kiln for sampling. The sampling probe is also provided with: A cooling water supply and drainage pipeline for cooling the sampling probe, and a washing water supply pipeline for washing and dust removal of the sampling probe; The sampling probe is connected to a sampling drive device, and driven by the sampling drive device, passes through the sampling hole near the sealing port at the kiln tail of the rotary kiln and enters the rotary kiln to perform high-temperature gas sampling. The sampling drive device includes a bracket and a probe push-pull mechanism connected to the bracket, the sampling probe is fixedly connected to the bracket, and the probe push-pull mechanism is used to drive the bracket to drive the sampling probe to move forward and backward. A sample gas outlet is provided at the tail end of the sampling probe, and the sample gas outlet is connected to a steam-water separator; one side of the steam-water separator inlet is connected to the sample gas outlet, and one side of the outlet is connected to a filter device; one side of the filter device outlet is provided with a sample gas output port, and the sample gas output port is connected to an analytical instrument.

2. The device for collecting high-temperature gas sample components for cement kiln analysis according to claim 1 is characterized in that: The cooling water supply and drainage pipe and the washing water supply pipe are respectively connected to an external water supply pipe.

3. The device for collecting high-temperature gas sample components for cement kiln analysis according to claim 1 is characterized in that: The probe push-pull mechanism is a motor, oil cylinder, air cylinder or screw propulsion mechanism.

4. The device for collecting high-temperature gas sample components for cement kiln analysis according to claim 3 is characterized in that: The probe push-pull mechanism is connected to a PLC controller, and the PLC controller is used to control the push-pull actuation of the probe push-pull mechanism.

5. The device for collecting high-temperature gas sample components for cement kiln analysis according to claim 1 is characterized in that: The filtering device comprises a primary filtering device and a secondary filtering device, the primary filtering device and the secondary filtering device are sequentially connected in series, and the sample gas output port is arranged at one side of the outlet of the secondary filtering device.

6. The method for operating the collection device for improving the representativeness of high-temperature sample gas components for cement kiln analysis according to claim 1, characterized in that: The following steps are involved: (1) connecting the cooling water supply and drainage pipeline, so that cooling water enters the sampling probe to cool the sampling probe; (2) The sampling drive device drives the sampling probe through the sampling hole near the sealing port of the rotary kiln tail to enter the rotary kiln for sampling; (3) Under the control of the PLC controller, when the set time is reached or the power or water supply is cut off, the sampling drive device automatically drives the sampling probe to withdraw from the sampling hole near the sealing port at the kiln tail of the rotary kiln until it returns to the initial position; and under the control of the PLC controller, when the set time is reached, the sampling drive device automatically drives the sampling probe to extend into the sampling hole near the sealing port at the kiln tail of the rotary kiln, return to the sampling position in the kiln, and continue to collect sample gas; (4) Connect the washing water supply pipeline, and use the washing water to rinse and remove dust from the sampling probe.

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