CN114354284B - Coal mill outlet anti-blocking sampling device and installation method - Google Patents
Coal mill outlet anti-blocking sampling device and installation method Download PDFInfo
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- CN114354284B CN114354284B CN202111564330.XA CN202111564330A CN114354284B CN 114354284 B CN114354284 B CN 114354284B CN 202111564330 A CN202111564330 A CN 202111564330A CN 114354284 B CN114354284 B CN 114354284B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention provides a coal mill outlet anti-blocking sampling device and an installation method, wherein the sampling device comprises: the device comprises a shell, a sampling tube, a first-stage filter element, a dust sweeping component and a first air blowing pipe, wherein the shell comprises a sampling part and a sealing part which are arranged separately, a sample inlet is formed in a first end of the sampling part, and a ceramic shell is arranged on the peripheral wall of the sampling part; the first end of sampling tube is equipped with the sample gas import, and in the sealing was located to the first end of sampling tube, the casing was located to the one-level filter core, and the first end of one-level filter core was located sampling portion and is adjacent the sample inlet, and the second end of one-level filter core is located sealing, sweeps dirt subassembly and locates in the casing for clean the peripheral wall of one-level filter core, the inner chamber intercommunication of first gas blow pipe and sampling portion is used for blowing out the casing with the dust in the sampling portion through the sample inlet. The embodiment of the invention comprises the following steps of. The sampling device has the characteristics of multistage filtration, high-efficiency dust removal, difficult blockage and long service life.
Description
Technical Field
The invention relates to the technical field of gas monitoring, in particular to an anti-blocking sampling device for an outlet of a coal mill and an installation method.
Background
With the increase of the number of large units, the fireproof and explosion-proof problems of the medium-speed mill are more and more prominent, and the ignition and explosion in the running process of the medium-speed mill directly affect the stable and full-fire of the units. According to the requirements of the explosion-proof design technical regulations of a coal and powder preparation system of a DLT5203-2005 thermal power plant: when the bituminous coal and the lignite with high sensitivity to combustion explosion and high volatile are adopted, a coal mill CO monitoring system is preferably arranged when a medium-speed mill or a double-inlet double-outlet coal mill direct-fired pulverizing system is adopted.
In the related art, the concentration of CO at the outlet of the coal mill is detected by installing a corresponding measuring probe, and the practicability of the gas detecting probe at the outlet of the coal mill adopted by the current power plant is poor, because of the high-dust and high-humidity environment in the coal mill, the detecting probe lacks a reliable dust removing device in the detecting and sampling process, is extremely easy to block in the high-dust and high-humidity environment, and is difficult to stably operate for a long time.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
in the related art, due to the working conditions of high dust, high humidity and strong positive pressure in the coal mill, the detection probe only removes dust through internal back blowing gas in the detection and sampling process, the reliability is poor, the measurement probe and the detection probe are easy to block, the online system cannot continuously and stably operate, the daily maintenance is high, and the detection probe only filters the sample gas through the primary filter element, so that the cleanliness of the filtered sample gas is poor. In addition, the vertical powder outlet pipe of the detection probe is arranged on the coal mill, and the installation mode is also very easy to cause the blockage of the probe.
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of one aspect of the invention provides an anti-blocking sampling device for an outlet of a coal mill, which has the characteristics of multistage filtration, high-efficiency dust removal, difficult blockage and long service life.
The embodiment of the other aspect of the invention provides a method for installing an anti-blocking sampling device for an outlet of a coal mill.
An embodiment of the first aspect of the invention provides a coal pulverizer outlet anti-blocking sampling device, comprising: the shell comprises a sampling part and a sealing part which are arranged in a separated mode, a sample inlet is formed in the first end of the sampling part, and a ceramic shell is arranged on the peripheral wall of the sampling part; the first end of the sampling tube is provided with a sample gas inlet, and the first end of the sampling tube is arranged in the sealing part; the first-stage filter element is arranged in the shell, the first end of the first-stage filter element is positioned in the sampling part and is adjacent to the sample inlet, the second end of the first-stage filter element is positioned in the sealing part, and gas enters the sampling part through the sample inlet and the sealing part after being filtered by the first-stage filter element, and then enters the sampling tube through the sample gas inlet; the dust sweeping assembly is arranged in the shell and comprises a sleeve and a plurality of brushes, the sleeve can slide along the extending direction of the primary filter element, at least part of the primary filter element is positioned in the sleeve, and the brushes are arranged on the inner wall of the sleeve and are in contact with the peripheral wall of the primary filter element; the first air blowing pipe is communicated with the inner cavity of the sampling part and used for blowing dust in the sampling part out of the shell through the sample inlet.
According to the anti-blocking sampling device for the coal mill outlet, disclosed by the embodiment of the invention, the service life of the sampling part under the flushing of coal dust in the coal mill is ensured by protecting the peripheral wall of the sampling part through the ceramic shell, the first air blowing pipe and the dust sweeping component are arranged, the first-stage filter element is cleaned regularly, the dust removing effect of the sampling device is improved, the stable operation of the sampling device is ensured, the blocking frequency is reduced, and the maintenance cost of on-site workers is saved.
In some embodiments, the casing further comprises a partition member for separating the sampling part and the sealing part, wherein a blocking hole for communicating the sealing part and the sampling part is formed in the partition member; the coal mill outlet anti-blocking sampling device further comprises a supporting component, wherein the supporting component is arranged in the sealing part, the supporting component comprises a supporting platform, a through hole is formed in the supporting platform, the sleeve penetrates through the blocking hole, and at least part of the sleeve is positioned in the through hole and slidably connected with the supporting platform; the first-level filter element sequentially penetrates through the blocking hole and the through hole and is connected with the supporting platform, and the sample gas inlet is located at one side, far away from the blocking hole, of the supporting platform.
In some embodiments, the dust sweeping assembly further comprises a connection table, the connection table is located on one side of the support platform close to the blocking hole, and the sleeve penetrates through the connection table and is connected with the connection table; the support assembly further comprises a guide rod arranged along the extending direction of the primary filter element, the guide rod penetrates through the connecting table, one end of the guide rod is connected with the inner wall of the shell, and the other end of the guide rod is connected with the support platform.
In some embodiments, further comprising a first bellows and a second bellows, each disposed around the sleeve; the first corrugated pipe is positioned between the connecting table and the blocking hole, one end of the first corrugated pipe is adjacent to the blocking hole and connected with the inner wall of the shell, the other end of the first corrugated pipe is connected with the first surface of the connecting table, and a first dust blocking space is defined in the sealing part by the first corrugated pipe; the second corrugated pipe is located between the connecting table and the supporting platform, one end of the second corrugated pipe is connected with the supporting platform, and the other end of the second corrugated pipe is connected with the second surface of the connecting table.
In some embodiments, the second bellows defines a second dust-blocking space within the sealing portion, and a first vent passing through the connection table is provided on the connection table, and the first vent communicates the first dust-blocking space with the second dust-blocking space; the anti-blocking sampling device for the outlet of the coal mill further comprises a second air blowing pipe, wherein the second air blowing pipe is communicated with the second dust blocking space and is used for blowing dust in the first dust blocking space and the second dust blocking space out of the blocking hole, and the first dust blocking space and the second dust blocking space are used for blocking dust in the first dust blocking space and the second dust blocking space.
In some embodiments, the separator is a graphite bearing, the graphite bearing is used for preventing dust from entering the first dust-blocking space, a second air vent is formed in the peripheral wall of the sleeve, and the second air vent communicates the inner cavity of the sleeve with the first dust-blocking space and/or the second dust-blocking space.
In some embodiments, the device further comprises a protective tube and an inner blowing tube, wherein the protective tube is arranged on one side of the supporting platform away from the blocking hole; the utility model discloses a gas-liquid separation device, including the protection tube, the one-level filter core, the second end of one-level filter core with the protection tube links to each other, the second end of one-level filter core is equipped with the gas vent that is equipped with in the protection tube, the first end of second filter core be equipped with the gas inlet that the gas vent set up relatively, through the sample gas after the one-level filter core filters loops through the gas vent with the air inlet flows in the second filter core, the first end of sampling tube wears to locate in the protection tube, the second end of second filter core is adjacent the sample gas inlet, interior blowpipe with the inner chamber intercommunication of second filter core.
In some embodiments, the device further comprises a heater and a thermocouple, wherein the heater and the thermocouple are arranged on the protection tube, the heater is used for heating the sample gas in the protection tube, and the thermocouple is used for controlling the temperature of the sample gas.
In some embodiments, the device further comprises a power assembly arranged on the supporting platform, wherein the power assembly is connected with the connecting table and used for pushing the connecting table.
The invention further aims to provide a mounting method of the coal mill outlet anti-blocking sampling device.
An installation method of an anti-blocking sampling device for an outlet of a coal mill according to an embodiment of a second aspect of the present invention includes the steps of: a mounting hole is formed in a position, adjacent to a powder outlet, of the coal mill, and the axial direction of the mounting hole is consistent with the powder outlet direction of the coal mill; the anti-blocking sampling device for the outlet of the coal mill passes through the mounting hole and is mounted on the coal mill, so that the sampling part is positioned in the coal mill and seals the mounting hole, and the central axis of the sample inlet is coaxial with the central axis of the mounting hole.
Drawings
FIG. 1 is a schematic diagram of a sampling device according to an embodiment of the present invention.
FIG. 2 is a schematic view of a portion of a dust-cleaning assembly of a sampling device according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of the installation position of the sampling device according to an embodiment of the present invention.
Reference numerals:
casing 1, sampling part 101, sample inlet 1011, ceramic casing 1012, sealing part 102, partition 103,
A sampling tube 2, a sample gas inlet 201,
A first-stage filter element 3, an exhaust port 301,
Dust sweeping component 4, sleeve 401, second vent 4011, brush 402, connecting table 403, first vent 4031,
A first air blowing pipe 5,
A first corrugated pipe 7, a first dust-proof space 701, a second corrugated pipe 8, a second dust-proof space 801,
A second air blowing pipe 9, a protection pipe 10, a secondary filter element 11, an air inlet 111,
An inner blowpipe 12, a heater 13, a thermocouple 14, a power assembly 15,
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The coal pulverizer outlet block-resistant sampling device 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, an anti-blocking sampling device 100 for a coal mill outlet according to an embodiment of the present invention includes a casing 1, a sampling tube 2, a primary filter element 3, a dust sweeping assembly 4 and a first air blowing pipe 5.
The casing 1 includes a sampling portion 101 and a sealing portion 102 which are arranged separately, a first end of the sampling portion 101 (a left end of the sampling portion 101 as shown in fig. 1) is provided with a sample inlet 1011, and a ceramic case 1012 is mounted on an outer peripheral wall of the sampling portion 101.
As shown in fig. 1, the sampling portion 101 is located at the left part of the casing 1, and the sealing portion 102 is located at the right part of the casing 1. The sampling portion 101 is a tubular article arranged along the left-right direction, the diameter of the sampling portion 101 is smaller than the width of the sealing portion 102, the left end of the sampling portion 101 is provided with a sample inlet 1011, and the outer peripheral wall of the sampling portion 101 is sleeved with a ceramic shell 1012. The sampling part 101 is used for being inserted into a coal mill, sample gas in the coal mill is adopted, the ceramic shell 1012 has the characteristics of wear resistance and scouring resistance and is used for protecting the sampling part 101, so that the service life of the coal mill outlet anti-blocking sampling device 100 in the coal mill is ensured.
A first end of the sampling tube 2 (left end of the sampling tube 2 as shown in fig. 1) is provided with a sample gas inlet 201, and the first end of the sampling tube 2 is provided in the sealing portion 102.
The left end of the sampling tube 2 is arranged in the sealing part 102, the right end of the sampling tube 2 is connected with a sample gas detecting instrument, the sampling tube 2 is used for conveying the sample gas collected by the machine shell 1 to a subsequent detecting system, and it can be understood that the sample gas is dust gas generated in the coal mill.
The first-stage filter element 3 is arranged in the casing 1, a first end (the left end of the first-stage filter element 3 shown in fig. 1) of the first-stage filter element 3 is positioned in the sampling part 101 and is adjacent to the sample inlet 1011, a second end (the right end of the first-stage filter element 3 shown in fig. 1) of the first-stage filter element 3 is positioned in the sealing part 102, and gas enters the sampling pipe 2 through the sample inlet 201 after entering the sampling part 101 through the sample inlet 1011 and being filtered by the first-stage filter element 3 and entering the sealing part 102.
As shown in fig. 1, the primary filter element 3 extends in the left-right direction, the left end of the primary filter element 3 is located at the sample inlet 1011, and the right end of the primary filter element 3 is located in the sealing portion 102. Sample gas enters the collection part and enters the inner cavity of the first-stage filter element 3 after being filtered by the first-stage filter element 3, the aperture of a filter hole of the first-stage filter element 3 is 5 mu m, large particle dust in the sample gas is blocked outside the first-stage filter element 3, and the first-stage filtering effect is achieved on the sample gas. The sample gas filtered by the first-stage filter element 3 enters the sealing part 102 and finally enters the sampling tube 2 through the sample gas inlet 201.
The dust sweeping component 4 is arranged in the casing 1, the dust sweeping component 4 comprises a sleeve 401 and a plurality of brushes 402, the sleeve 401 is slidable along the extending direction (left-right direction as shown in fig. 1) of the primary filter element 3, at least part of the primary filter element 3 is positioned in the sleeve 401, and the brushes 402 are arranged on the inner wall of the sleeve 401 and are in contact with the outer peripheral wall of the primary filter element 3.
As shown in fig. 1, the central axis of the sleeve 401 is arranged in the left-right direction, the sleeve 401 is sleeved on the primary filter element 3, the inner wall of the sleeve 401 is spaced from the outer wall of the primary filter element 3, the left end of the sleeve 401 is located in the sampling portion 101, and the right end of the sleeve 401 is located in the sealing portion 102. The plurality of brushes 402 are uniformly distributed on the inner wall of the sleeve 401 along the axial direction of the sleeve 401 in a spiral manner, and the plurality of brushes 402 are positioned in the collecting part. In the process that the sleeve 401 slides along the left-right direction, the brush 402 cleans the outer wall of the first-stage filter element 3, and the brush 402 cleans large particle dust adsorbed after the sample gas is filtered on the first-stage filter element 3, and the part of the first-stage filter element 3 is positioned in the sampling part 101.
The first air blowing pipe 5 is communicated with the inner cavity of the sampling part 101 and is used for blowing dust in the sampling part 101 out of the machine shell 1 through the sample inlet 1011.
As shown in fig. 1, the peripheral wall of the sampling unit 101 is provided with an air blowing port, one end of the first air blowing pipe 5 is communicated with the air blowing port, and the other end of the first air blowing pipe 5 is communicated with an external compressor. Compressed air supplied from the compressor is sent to the air blowing port through the first air blowing pipe 5 and blown into the inner cavity of the sampling portion 101. The air blowing port is arranged towards the direction of the primary filter element 3, so that compressed air mainly blows dust attached to the primary filter element 3, and the dust in the sampling part 101 is blown back into the coal mill along with high-pressure air flowing through the sample inlet 1011.
Therefore, the first air blowing pipe 5 blows air to remove most floating ash on the first-stage filter element 3, the dust sweeping component 4 uses the hairbrush 402 to sweep stubborn dust attached to the first-stage filter element 3, the reliability of a dust removing function is improved, the blocking rate of the coal mill outlet anti-blocking sampling device 100 in the embodiment of the invention when sampling in a coal mill is reduced, and the sampling efficiency is indirectly improved.
According to the anti-blocking sampling device 100 for the coal mill outlet, disclosed by the embodiment of the invention, the peripheral wall of the sampling part 101 is protected by the ceramic shell 1012, the service life of the sampling part 101 in the coal mill under the flushing of coal dust is guaranteed, the first air blowing pipe 5 and the dust sweeping component 4 are arranged, the primary filter element 3 is cleaned regularly, the dust removing effect of the sampling device 100 is improved, the stable operation of the sampling device 100 is ensured, the blocking frequency is reduced, and the maintenance cost of on-site workers is saved.
In some embodiments, as shown in fig. 1, the casing 1 further includes a partition 103 separating the sampling part 101 and the sealing part 102, and a blocking hole for communicating the sealing part 102 and the sampling part 101 is provided on the partition 103.
It can be understood that the right end of the sampling part 101 is connected to the left end of the sealing part 102, and the inner cavity of the sampling part 101 and the inner cavity of the sealing part 102 together form the inner cavity of the casing 1. The partition 103 is provided in the casing 1 and is located at a portion where the sampling portion 101 and the sealing portion 102 are connected.
The anti-blocking sampling device 100 for the outlet of the coal mill further comprises a supporting component 6, the supporting component 6 is arranged in the sealing part 102, the supporting component 6 comprises a supporting platform 601, a through hole is formed in the supporting platform 601, the sleeve 401 penetrates through the blocking hole, and at least part of the sleeve 401 is located in the through hole and slidably connected with the supporting platform 601. The primary filter element 3 sequentially penetrates through the blocking hole and the through hole and is connected with the supporting platform 601, and the sample gas inlet 201 is located on one side (the right side of the supporting platform 601 shown in fig. 1) of the supporting platform 601 away from the blocking hole.
Alternatively, as shown in fig. 1, the support platform 601 is connected to the inner wall of the casing 1, the center axis of the blocking hole and the center axis of the through hole are both disposed in the left-right direction, and the center axis of the sleeve 401, the center axis of the blocking hole, and the center axis of the through hole are coaxial.
The support platform 601 is provided with a flange 6011, the flange 6011 is fixed on the support platform 601 through bolts, the flange 6011 is assembled in the through hole, the right end of the flange 6011 extends out of the through hole and is positioned on the right side of the support platform 601, and the central axis of the central hole of the flange 6011 is coaxial with the central axis of the through hole. The first-stage filter element 3 sequentially penetrates through the blocking hole and the through hole from left to right, and the right end of the first-stage filter element 3 stretches into the central hole of the flange 6011 and is connected with the flange 6011.
An annular body 6012 is arranged in the flange 6011, the annular body 6012 is fixedly connected to the inner wall of the flange 6011, and the central axis of the annular body 6012 is coaxial with the central axis of the through hole. The sleeve 401 penetrates through the blocking hole, the right end of the sleeve 401 is located in the annular body 6012, and a gap is formed between the inner wall of the annular body 6012 and the outer wall of the sleeve 401. A plurality of balls are uniformly distributed on the inner wall of the annular body 6012, and all the balls are in contact with the outer wall of the sleeve 401, and when the sleeve 401 slides along the left-right direction, the balls also rotate relatively between the center of the balls and the annular body 6012, so that friction force generated when the sleeve 401 slides is reduced.
In some embodiments, as shown in fig. 1 and 2, the dust cleaning assembly 4 further comprises a connection table 403, the connection table 403 being located on a side of the support platform 601 close to the blocking hole (on the left side of the support platform 601 as shown in fig. 1), and the sleeve 401 penetrating the connection table 403 and being connected to the connection table 403.
It will be appreciated that the connection table 403 comprises a disc having a central axis coaxial with the central axis of the sleeve 401 and a projection connected to the disc, the projection being located radially on the peripheral side of the disc. The disc is provided with a through hole, the central axis of the through hole is coaxial with the central axis of the sleeve 401, the sleeve 401 penetrates through the through hole, and the outer wall of the sleeve 401 is connected with the inner wall of the disc.
The support assembly 6 further includes a guide rod 602 disposed along an extending direction (left-right direction as viewed in fig. 1) of the primary filter element 3, the guide rod 602 penetrates through the connection table 403, one end of the guide rod 602 is connected to an inner wall of the casing 1, and the other end of the guide rod 602 is connected to the support platform 601.
Optionally, a guide hole is formed in the connecting table 403 and disposed along a left-right direction, the guide rod 602 penetrates through the guide hole, the left end of the guide rod 602 is connected with the inner wall of the casing 1, and the right end of the guide rod 602 is connected with the supporting platform 601. Therefore, the guide bar 602 plays a role of a guide support during the left-right sliding of the sleeve 401, so that the sleeve 401 does not move up and down.
In some embodiments, as shown in fig. 1, further comprising a first bellows 7 and a second bellows 8, each of the first bellows 7 and the second bellows 8 is disposed around the sleeve 401. The first bellows 7 is located between the connection table 403 and the blocking hole, one end of the first bellows 7 (e.g., the left end of the first bellows 7 in fig. 1) is adjacent to the blocking hole and is connected to the inner wall of the casing 1, the other end of the first bellows 7 (e.g., the right end of the first bellows 7 in fig. 1) is connected to the first surface of the connection table 403, and the first bellows 7 defines a first dust blocking space 701 in the sealing part 102. The second bellows 8 is located between the connection stage 403 and the support platform 601, one end of the second bellows 8 (e.g., the right end of the second bellows 8 in fig. 1) is connected to the support platform 601, and the other end of the second bellows 8 (e.g., the left end of the second bellows 8 in fig. 1) is connected to the second surface of the connection stage 403.
It will be appreciated that the first surface of the connection table 403 is the left surface of the disk and the second surface of the connection table 403 is the right surface of the disk.
Alternatively, as shown in fig. 1, the central axis of the first bellows 7 and the central axis of the second bellows 8 are coaxial with the central axis of the sleeve 401, the inner wall of the first bellows 7 is spaced apart from the outer wall of the sleeve 401, the inner wall of the second bellows 8 is spaced apart from the outer wall of the sleeve 401, the inner diameter of the first bellows 7 is the same as the inner diameter of the second bellows 8, and the inner diameter of the first bellows 7 is larger than the inner diameter of the blocking hole.
The left end of the first corrugated pipe 7 is provided with a first sealing connecting seat, the right end of the first corrugated pipe 7 is provided with a second sealing connecting seat, the first sealing connecting seat is connected with the inner wall of the shell 1 through bolts, and the second sealing connecting seat is connected with the left surface of the disc through bolts.
The right end of the second bellows 8 is provided with a third sealing connecting seat, the left end of the second bellows 8 is provided with a fourth sealing connecting seat, the third sealing connecting seat is connected with the left surface of the supporting platform 601 through bolts, and the fourth sealing connecting seat is connected with the right surface of the disc through bolts.
The first dust-blocking space 701 is located between the inner wall of the first bellows 7 and the outer wall of the sleeve 401, and the first dust-blocking space 701 separates the inner space of the collecting portion from the remaining space of the sealing portion 102 excluding the first dust-blocking space 701. Therefore, after the sample gas enters the sampling part 101, the sample gas can only pass through the first-stage filter element 3 for filtration, and enters the sampling tube 2 along the inner cavity of the first-stage filter element 3, so that the cleanliness of the sample gas in the sampling tube 2 is ensured, and the influence of coal dust of the coal mill on the components outside the sampling part 101 and the first dust blocking space 701 of the sampling device 100 is avoided. And, still improved the leakproofness of sampling device 100, if the casing 1 that is located sealing 102 is damaged, first dust blocking space 701 can also play the intercommunication of separation coal pulverizer and external environment, prevents that the coal dust in the coal pulverizer from leaking outside to the external environment through sampling device 100.
In some embodiments, as shown in fig. 1, the second bellows 8 defines a second dust-blocking space 801 within the sealing portion 102, and a first vent 4031 penetrating the connecting platform 403 is provided on the connecting platform 403, and the first vent 4031 communicates the first dust-blocking space 701 with the second dust-blocking space 801. The anti-blocking sampling device 100 for the outlet of the coal mill further comprises a second air blowing pipe 9, wherein the second air blowing pipe 9 is communicated with the second dust blocking space 801 and is used for blowing dust in the first dust blocking space 701 and the second dust blocking space 801 out of the first dust blocking space 701 and the second dust blocking space 801 from blocking holes.
Optionally, as shown in fig. 1, the second dust-blocking space 801 is located between the inner wall of the second bellows 8 and the outer wall of the sleeve 401, and the first air port 4031 is opened on the disc and penetrates the disc in the left-right direction, so that the first dust-blocking space 701 is communicated with the second dust-blocking space 801. The left end of the second air blowing pipe 9 penetrates through the second dust blocking space 801, the right end of the second air blowing pipe 9 is communicated with the external compressor, and compressed air enters the second dust blocking space 801 through the second air blowing pipe 9 and flows into the first dust blocking space 701.
It will be appreciated that after the sample gas enters the sampling section 101, a portion of the sample gas will flow to the right end of the sleeve 401 and then enter the second dust blocking space 801 through the gap between the annular body 6012 and the sleeve 401. Therefore, the first air vent 4031 is formed on the connection platform 403, so that the compressed air conveyed by the second air blowing pipe 9 can fill the first dust blocking space 701 and the second dust blocking space 801 at the same time.
In addition, the second air blowing pipe 9 has a dust removing effect on the first dust blocking space 701 and the second dust blocking space 801, and blows dust in the first dust blocking space 701 and the second dust blocking space 801 out of the blocking holes.
In some embodiments, as shown in fig. 1, the partition 103 is a graphite bearing, the graphite bearing is used for preventing dust from entering the first dust-preventing space 701, a second air vent 4011 is formed on a peripheral wall of the sleeve 401, and the second air vent 4011 communicates an inner cavity of the sleeve 401 with the first dust-preventing space 701 and/or the second dust-preventing space 801.
Alternatively, as shown in fig. 1, the sleeve 401 is divided into a first cylindrical section, an oblique section and a second cylindrical section which are sequentially connected, the first cylindrical section and the second cylindrical section are respectively located at the left side and the right side of the oblique section, the outer diameter of the first cylindrical section is larger than that of the second cylindrical section, and the cross-sectional area of the oblique section is sequentially reduced from left to right. The first cylindrical section and the inclined section are both positioned at the left side of the graphite bearing, and the second cylindrical section penetrates through the blocking hole.
The inner hole of the graphite bearing is a blocking hole in the embodiment, the diameter of the blocking hole is the same as the outer diameter of the second cylindrical section, and the inner wall of the graphite bearing is contacted with the outer wall of the second cylindrical section. The external diameter of graphite bearing is the same with the internal diameter of collection portion, and graphite bearing's outer wall and collection portion's inner wall laminating and link to each other.
Therefore, the oblique section plays a certain limiting role, so that the sleeve 401 cannot slide continuously rightward after the sleeve 401 slides rightward until the oblique section contacts with the graphite bearing in the process of sliding the sleeve 401 rightward and leftward. And the adsorption characteristic of the graphite bearing can prevent a large amount of dust in the coal mill from entering the first sinking preventing space.
Optionally, as shown in fig. 1, there are two second air vents 4011, where one second air vent 4011 is located in the first dust blocking space, so that the first dust blocking space 701 is in communication with the inner cavity of the sleeve 401, and the other second air vent 4011 is located in the second dust blocking space, so that the second dust blocking space 801 is in communication with the inner cavity of the sleeve 401.
Therefore, the second air blowing pipe 9 blows the dust in the first dust blocking space 701 and the second dust blocking space 801 from the second air vent 4011 into the sleeve 401 and back into the coal mill along the inner cavity of the sleeve 401. And the second air blowing pipe 9 also plays a role in blowing the primary filter element 3 in the sleeve 401, so that the dust removal effect is further improved.
In some embodiments, as shown in fig. 1, the protective tube 10 and the inner blow tube 12 are further included, and the protective tube 10 is disposed on a side of the support platform 601 away from the barrier hole (e.g., on the right side of the support platform 601 in fig. 1). The first-stage filter element 3 is connected with the protection tube 10, the second end (right end of the first-stage filter element 3 in fig. 1) of the first-stage filter element 3 is provided with an exhaust port 301, the protection tube 10 is internally provided with a second-stage filter element 11, the first end (left end of the second-stage filter element 11 in fig. 1) of the second-stage filter element 11 is provided with an air inlet 111 opposite to the exhaust port 301, and sample gas filtered by the first-stage filter element 3 flows into the second-stage filter element 11 through the exhaust port 301 and the air inlet 111 in sequence. The first end of the sampling tube 2 is arranged in the protection tube 10 in a penetrating way, the second end of the secondary filter element 11 (such as the right end of the secondary filter element 11 in fig. 1) is adjacent to the sample gas inlet 201, and the inner blowpipe 12 is communicated with the inner cavity of the secondary filter element 11.
Alternatively, as shown in fig. 1, the protection pipe 10 is disposed in the left-right direction, the central axis of the protection pipe 10 is coaxial with the central axis of the through hole, the protection pipe 10 is fitted into the central hole of the flange 6011, and the left end of the protection pipe 10 is opened. The left end of the sampling tube 2 is arranged in the protection tube 10 in a penetrating way, and the sample gas inlet 201 is arranged at the right end part of the protection tube 10. The outer peripheral wall of the secondary filter element 11 is attached to the inner peripheral wall of the protection tube 10, the right end of the secondary filter element 11 is adjacent to the sample gas inlet 201, and the diameter of the filter hole of the secondary filter element 11 is 2 μm.
The sample gas filtered by the primary filter element 3 flows out from the exhaust port 301 from left to right along the inner cavity of the primary filter element 3, and enters the secondary filter element 11 from the air inlet 111. Then the filtered gas is discharged to the right end part of the protection tube 10 through the secondary filter element 11, and then enters the sampling tube 2 through the sample gas inlet 201.
Therefore, the multi-stage filtration sample gas of the first-stage filter element 3 and the second-stage filter element 11 is adopted, so that the cleanliness of the sample gas is improved, and the subsequent sample gas detection instrument is prevented from being polluted.
Optionally, the left end of the inner blowpipe 12 sequentially penetrates through the protection pipe 10 and the secondary filter element 11, so that the inner blowpipe 12 is communicated with the inner cavity of the secondary filter element 11, and the right end of the inner blowpipe 12 is connected with the external compressor. Compressed air enters the secondary filter element 11 through the inner blow pipe 12 and flows into the primary filter element 3.
It can be understood that compressed air is input into the filter element, so that the compressed air seeps out of the filter element from the inside of the filter element, dust attached to the surface of the filter element is cleaned, the inner dust blowing mode of the filter element is realized, and the dust removing effect of the filter element is further improved.
In some embodiments, as shown in fig. 1, the apparatus further comprises a heater 13 and a thermocouple 14, wherein the heater 13 and the thermocouple 14 are both arranged on the protection tube 10, the heater 13 is used for heating the sample gas in the protection tube 10, and the thermocouple 14 is used for controlling the temperature of the sample gas.
Optionally, the heater 13 and the thermocouple 14 are both disposed on the peripheral wall of the protection tube 10, and heated by the heater 13, so as to protect the sample gas in the tube 10, evaporate moisture in the sample gas, reduce the dew point, avoid the sample gas containing moisture from entering the sampling tube 2, cause condensation on the pipeline, and influence the detection of the subsequent sample gas.
In some embodiments, as shown in fig. 1, the power assembly 15 is further included on the support platform 601, and the power assembly 15 is connected to the connection table 403 and is used to push the connection table 403.
Alternatively, as shown in fig. 1, the power component 15 is an air cylinder, the air cylinder is mounted on the supporting platform 601 and is located on the right side of the supporting platform 601, the supporting platform 601 is provided with an extending hole, a push rod of the air cylinder penetrates through the extending hole, and the left end of the push rod of the air cylinder is connected with the protruding block. The push rod of the cylinder moves and drives the sleeve 401 to slide left and right, the extension length of the cylinder is smaller than the length of the right end of the sleeve 401 in the through hole, and the right end of the sleeve 401 cannot be separated from the through hole in the cylinder moving process.
It can be appreciated that, since the installation of the sampling device 100 at the outlet of the coal mill requires attention to the explosion protection, the dust sweeping assembly 4 is driven in a pneumatic manner to sweep the primary filter element 3, so that the safety of the sampling device 100 is improved.
Specifically, the first air blowing pipe 5, the second air blowing pipe 9, the inner air blowing pipe 12 and the air cylinder are all provided with compressed air by the compressor, a first air passage is arranged between the first air blowing pipe 5 and the compressor, a second air passage is arranged between the second air blowing pipe 9 and the compressor, a third air passage is arranged between the inner air blowing pipe 12 and the compressor, and a fourth air passage is arranged between the air cylinder and the compressor. And control valves for controlling the on-off of air flow are arranged on the first air passage, the second air passage, the third air passage and the fourth air passage.
A method for installing the coal pulverizer outlet anti-blocking sampling device 100 according to another embodiment of the present invention is described below with reference to fig. 3, and includes the following steps:
a mounting hole is formed in the position, adjacent to the powder outlet, of the coal mill 200, and the axial direction of the mounting hole is consistent with the powder outlet direction of the coal mill.
The anti-blocking sampling device 100 for the outlet of the coal mill of the above embodiment is installed on the coal mill 200 through the installation hole, so that the sampling portion 101 is located in the coal mill 200 and seals the installation hole, and the central axis of the sample inlet 1011 is coaxial with the central axis of the installation hole.
It can be understood that the sampling portion 101 is located in the coal mill 200, the sealing portion 102 is located outside the coal mill 200, and sample gas in the coal mill 200 enters the sampling portion 101 through the sample inlet 1011, and enters the sampling tube 2 through the sample gas inlet 201 after being filtered by the primary filter element 3 and the secondary filter element 11. The sampling device 100 adopts an installation mode parallel to the powder outlet direction of the coal mill 200, and the pneumatic mechanical dust sweeping component 4 is combined with the multi-path internal and external back blowing air blowing pipe, so that the blocking condition of the filter element is greatly reduced.
In the description of the present invention, it will be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. The utility model provides a coal pulverizer export prevents stifled sampling device which characterized in that includes:
the shell comprises a sampling part and a sealing part which are arranged in a separated mode, a sample inlet is formed in the first end of the sampling part, and a ceramic shell is arranged on the peripheral wall of the sampling part;
the first end of the sampling tube is provided with a sample gas inlet, and the first end of the sampling tube is arranged in the sealing part;
the first-stage filter element is arranged in the shell, the first end of the first-stage filter element is positioned in the sampling part and is adjacent to the sample inlet, the second end of the first-stage filter element is positioned in the sealing part, and gas enters the sampling part through the sample inlet and the sealing part after being filtered by the first-stage filter element, and then enters the sampling tube through the sample gas inlet;
the dust sweeping assembly is arranged in the shell and comprises a sleeve and a plurality of brushes, the sleeve can slide along the extending direction of the primary filter element, at least part of the primary filter element is positioned in the sleeve, and the brushes are arranged on the inner wall of the sleeve and are in contact with the peripheral wall of the primary filter element;
the first air blowing pipe is communicated with the inner cavity of the sampling part and used for blowing dust in the sampling part out of the shell through the sample inlet;
the casing further comprises a partition member for separating the sampling part from the sealing part, wherein a blocking hole for communicating the sealing part with the sampling part is formed in the partition member;
the coal mill outlet anti-blocking sampling device further comprises a supporting component, wherein the supporting component is arranged in the sealing part, the supporting component comprises a supporting platform, a through hole is formed in the supporting platform, the sleeve penetrates through the blocking hole, and at least part of the sleeve is positioned in the through hole and slidably connected with the supporting platform;
the first-stage filter element sequentially penetrates through the blocking hole and the through hole and is connected with the supporting platform, and the sample gas inlet is positioned at one side, far away from the blocking hole, of the supporting platform;
the dust sweeping assembly further comprises a connecting table, the connecting table is positioned on one side, close to the blocking hole, of the supporting platform, and the sleeve penetrates through the connecting table and is connected with the connecting table;
the support assembly further comprises a guide rod arranged along the extending direction of the primary filter element, the guide rod penetrates through the connecting table, one end of the guide rod is connected with the inner wall of the shell, and the other end of the guide rod is connected with the support platform;
the device further comprises a first corrugated pipe and a second corrugated pipe, wherein the first corrugated pipe and the second corrugated pipe are arranged around the sleeve;
the first corrugated pipe is positioned between the connecting table and the blocking hole, one end of the first corrugated pipe is adjacent to the blocking hole and connected with the inner wall of the shell, the other end of the first corrugated pipe is connected with the first surface of the connecting table, and a first dust blocking space is defined in the sealing part by the first corrugated pipe;
the second corrugated pipe is positioned between the connecting table and the supporting platform, one end of the second corrugated pipe is connected with the supporting platform, and the other end of the second corrugated pipe is connected with the second surface of the connecting table;
the second corrugated pipe defines a second dust-blocking space in the sealing part, a first air vent penetrating through the connecting table is arranged on the connecting table, and the first air vent communicates the first dust-blocking space with the second dust-blocking space;
the anti-blocking sampling device for the outlet of the coal mill further comprises a second air blowing pipe, wherein the second air blowing pipe is communicated with the second dust blocking space and is used for blowing dust in the first dust blocking space and the second dust blocking space out of the blocking hole, and the first dust blocking space and the second dust blocking space are used for blocking dust in the first dust blocking space and the second dust blocking space.
2. The coal pulverizer outlet anti-blocking sampling device of claim 1, wherein the separator is a graphite bearing, the graphite bearing is used for preventing dust from entering the first dust-blocking space, a second vent is formed in the peripheral wall of the sleeve, and the second vent communicates the inner cavity of the sleeve with the first dust-blocking space and/or the second dust-blocking space.
3. The coal pulverizer outlet anti-blocking sampling device of claim 1, further comprising a protective tube and an inner lance, the protective tube being disposed on a side of the support platform remote from the barrier aperture;
the utility model discloses a gas-liquid separation device, including the protection tube, the one-level filter core, the second end of one-level filter core with the protection tube links to each other, the second end of one-level filter core is equipped with the gas vent that is equipped with in the protection tube, the first end of second filter core be equipped with the gas inlet that the gas vent set up relatively, through the sample gas after the one-level filter core filters loops through the gas vent with the air inlet flows in the second filter core, the first end of sampling tube wears to locate in the protection tube, the second end of second filter core is adjacent the sample gas inlet, interior blowpipe with the inner chamber intercommunication of second filter core.
4. The coal pulverizer outlet block-resistant sampling device of claim 3, further comprising a heater and a thermocouple, both disposed on the protective tube, the heater being configured to heat the sample gas within the protective tube, the thermocouple being configured to control the temperature of the sample gas.
5. The coal pulverizer outlet block-resistant sampling device of claim 1, further comprising a power assembly disposed on the support platform, the power assembly being coupled to the connection block and configured to push the connection block.
6. The installation method of the anti-blocking sampling device for the coal mill outlet is characterized by comprising the following steps of:
a mounting hole is formed in a position, adjacent to a powder outlet, of the coal mill, and the axial direction of the mounting hole is consistent with the powder outlet direction of the coal mill;
the coal mill outlet anti-blocking sampling device according to any one of claims 1 to 5 is mounted on a coal mill through the mounting hole, so that the sampling part is positioned in the coal mill and seals the mounting hole, and the central axis of the sample inlet is coaxial with the central axis of the mounting hole.
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| CN202111564330.XA CN114354284B (en) | 2021-12-20 | 2021-12-20 | Coal mill outlet anti-blocking sampling device and installation method |
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| CN202111564330.XA CN114354284B (en) | 2021-12-20 | 2021-12-20 | Coal mill outlet anti-blocking sampling device and installation method |
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| CN114354284B true CN114354284B (en) | 2023-07-14 |
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| CN115301645B (en) * | 2022-10-11 | 2023-02-28 | 合肥金星智控科技股份有限公司 | Deslagging device and deslagging method for gas sampling pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1340918A (en) * | 1971-04-08 | 1973-12-19 | Nippon Steel Corp | Sampling apparatus for analyzing gas |
| JP5989486B2 (en) * | 2012-09-27 | 2016-09-07 | メタウォーター株式会社 | Sampling device |
| CN205246401U (en) * | 2015-12-21 | 2016-05-18 | 西克麦哈克（北京）仪器有限公司 | Maintain medium temperature sampling probe less |
| CN211235147U (en) * | 2019-07-30 | 2020-08-11 | 光力科技股份有限公司 | Coal mill gas sampling device and coal powder filter thereof |
| CN210834345U (en) * | 2019-09-06 | 2020-06-23 | 朝阳燕山湖发电有限公司 | Flue gas sampling device with self-cleaning function |
| CN213239634U (en) * | 2020-09-30 | 2021-05-18 | 河南科正检测技术有限公司 | Multifunctional waste gas sampling device |
| CN112577915A (en) * | 2020-11-24 | 2021-03-30 | 清华大学 | Coal fired power plant coal pulverizer export CO and temperature on-line monitoring early warning system |
| CN112729974B (en) * | 2020-12-22 | 2022-02-18 | 清华大学 | High-temperature high-dust corrosion-resistant anti-blocking sampling device for water-cooled wall of pulverized coal boiler and mounting method |
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