CN114354284A - Anti-blocking sampling device for coal mill outlet and installation method - Google Patents
Anti-blocking sampling device for coal mill outlet and installation method Download PDFInfo
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- CN114354284A CN114354284A CN202111564330.XA CN202111564330A CN114354284A CN 114354284 A CN114354284 A CN 114354284A CN 202111564330 A CN202111564330 A CN 202111564330A CN 114354284 A CN114354284 A CN 114354284A
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Abstract
The invention provides an anti-blocking sampling device for an outlet of a coal mill and an installation method, wherein the sampling device comprises: the device comprises a shell, a sampling pipe, a primary filter element, a dust sweeping assembly and a first blowing pipe, wherein 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 installed on the peripheral wall of the sampling part; the first end of sampling tube is equipped with the sample gas import, in the sealing is located to the first end of sampling tube, the casing is located to the one-level filter core, the first end of one-level filter core is located the sampling portion and is close to the introduction port, the second end of one-level filter core is located the sealing, sweep the dirt subassembly and locate in the casing for clean the periphery wall of one-level filter core, first blowpipe and the inner chamber intercommunication of sampling portion, be used for blowing off the casing with the dust in the sampling portion through the introduction port. The invention is provided. The sampling device has the characteristics of multi-stage 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 problems of fire prevention and explosion prevention of the medium-speed mill become more and more prominent, and the stable and full firing of the units is directly influenced by the firing and explosion in the operation process of the medium-speed mill. According to the requirements of the explosion-proof design technical code of coal and powder process systems of DLT5203-2005 thermal power plants: when a medium-speed mill or a double-inlet and double-outlet coal mill direct-blowing pulverizing system is adopted for combusting bituminous coal and lignite with high explosion sensitivity and high volatile component, a coal mill CO monitoring system is preferably arranged.
Among the correlation technique, detect coal pulverizer export CO concentration through installing corresponding measuring probe, and the gaseous test probe practicality of coal pulverizer export that present power plant adopted is poor, because high dirt, the high humid environment in the coal pulverizer, the test probe detects and lacks reliable dust collector in the sampling process, very easily blocks up under high dirt, the high humid environment, is difficult to long-term steady operation.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
in the correlation technique, because the operating mode of high dirt, high humidity, strong malleation in the coal-grinding machine, the test probe detects only through inside blowback dust removal in the sampling process, and the reliability is relatively poor, and the test probe reaches and easily blocks up, and online system can not continuous steady operation, and the daily maintenance height to only filter the sample gas through one-level filter core in the test probe, filter the cleanliness factor of obtaining the sample gas relatively poor. In addition, the detection probe is vertically arranged on the coal mill, and the installation mode is easy to cause probe blockage.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of one aspect of the invention provides a coal mill outlet anti-blocking sampling device which has the characteristics of multi-stage filtration, high-efficiency dust removal, difficulty in blocking and long service life.
The embodiment of the invention provides a method for installing an anti-blocking sampling device at an outlet of a coal mill.
The anti-blocking sampling device for the outlet of the coal mill comprises: the sampling device comprises a shell, a sampling part and a sealing part, wherein 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 installed 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, is filtered by the first-stage filter element, enters the sealing part and then enters the sampling pipe through the sample gas inlet; the dust sweeping assembly is arranged in the machine 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 outer 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 out dust in the sampling part from the shell through the sample inlet.
According to the anti-blocking sampling device for the outlet of the coal mill, the outer peripheral wall of the sampling part is protected by the ceramic shell, the service life of the sampling part under the condition that coal powder in the coal mill is washed is guaranteed, the first air blowing pipe and the dust sweeping assembly are arranged, the first-stage filter element is periodically swept, the dust removal effect of the sampling device is improved, the stable operation of the sampling device is guaranteed, the blocking frequency is reduced, and therefore the maintenance cost of field workers is saved.
In some embodiments, the housing further comprises a partition separating the sampling part from the sealing part, and the partition is provided with a blocking hole for communicating the sealing part with the sampling part; the anti-blocking sampling device for the coal mill outlet further comprises a supporting assembly, the supporting assembly is arranged in the sealing part and 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 located in the through hole and is connected with the supporting platform in a sliding mode; the one-level filter core runs through in proper order the separation hole with the through-hole and with supporting platform links to each other, the appearance gas inlet is located supporting platform keeps away from one side in separation hole.
In some embodiments, the dust sweeping assembly further comprises a connecting platform located on one side of the support platform near the blocking hole, and the sleeve penetrates through the connecting platform and is connected with the connecting platform; the supporting component further comprises a guide rod arranged in the extending direction of the primary filter element, the guide rod penetrates through the connecting platform, one end of the guide rod is connected with the inner wall of the casing, and the other end of the guide rod is connected with the supporting 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 platform and the blocking hole, one end of the first corrugated pipe is close to the blocking hole and is 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 platform, 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 platform 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 platform.
In some embodiments, the second bellows defines a second dust-blocking space within the seal portion, and the connection platform is provided with a first vent hole penetrating through the connection platform, the first vent hole communicating the first dust-blocking space with the second dust-blocking space; the coal mill outlet anti-blocking sampling device 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 out dust in the first dust blocking space and the second dust blocking space from the blocking hole.
In some embodiments, the partition is a graphite bearing, the graphite bearing is used for blocking dust from entering the first dust-blocking space, the peripheral wall of the sleeve is provided with a second vent, and the second vent connects 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 protection pipe and an inner blow pipe, wherein the protection pipe is arranged on one side of the supporting platform far away from the blocking hole; the first-stage filter element is connected with the protection tube, the second end of the first-stage filter element is provided with an air outlet, a second-stage filter element is arranged in the protection tube, the first end of the second-stage filter element is provided with an air inlet opposite to the air outlet, sample gas filtered by the first-stage filter element sequentially passes through the air outlet and the air inlet and flows into the second-stage filter element, the first end of the sampling tube is arranged in the protection tube in a penetrating mode, the second end of the second-stage filter element is adjacent to the sample gas inlet, and the inner blowpipe is communicated with the inner cavity of the second-stage filter element.
In some embodiments, the gas sample heating device further comprises a heater and a thermocouple, the heater and the thermocouple are both arranged on the protection tube, the heater is used for heating the gas sample in the protection tube, and the thermocouple is used for controlling the temperature of the gas sample.
In some embodiments, the device further comprises a power assembly arranged on the supporting platform, and the power assembly is connected with the connecting platform and used for pushing the connecting platform.
The invention also aims to provide an installation method of the anti-blocking sampling device for the outlet of the coal mill.
The installation method of the anti-blocking sampling device for the outlet of the coal mill comprises the following steps: the coal pulverizer is provided with a mounting hole at a position adjacent to the powder outlet, and the axial direction of the mounting hole is consistent with the powder outlet direction of the coal pulverizer; and (3) enabling the coal mill outlet anti-blocking sampling device to penetrate through the mounting hole to be mounted on the coal mill, enabling the sampling part to be located in the coal mill, sealing the mounting hole, and enabling the central axis of the sample inlet to be 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 part of the dust-sweeping assembly of the sampling device according to the embodiment of the present invention.
Fig. 3 is a schematic view of the installation position of the sampling device of the embodiment of the present invention.
Reference numerals:
a housing 1, a sampling part 101, a sample inlet 1011, a ceramic shell 1012, a sealing part 102, a separator 103,
A sampling tube 2, a sample gas inlet 201,
A first-stage filter element 3, an exhaust port 301,
A dust-cleaning component 4, a sleeve 401, a second ventilating opening 4011, a brush 402, a connection table 403, a first ventilating opening 4031,
A first air blowing pipe 5,
A supporting component 6, a supporting platform 601, a flange 6011, an annular body 6012, a guide rod 602,
A first bellows 7, a first dust-proof space 701, a second bellows 8, a second dust-proof space 801,
A second gas blowing pipe 9, a protective pipe 10, a secondary filter element 11, a gas inlet 111,
An internal blowing pipe 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 with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The anti-blocking sampling device 100 for the outlet of the coal mill according to the embodiment of the invention is described below with reference to the drawings.
As shown in fig. 1, the anti-blocking sampling device 100 for the outlet of the coal mill according to the embodiment of the invention includes a casing 1, a sampling pipe 2, a primary filter element 3, a dust sweeping assembly 4 and a first blowing pipe 5.
The casing 1 comprises a sampling part 101 and a sealing part 102 which are separately arranged, a first end (the left end of the sampling part 101 shown in fig. 1) of the sampling part 101 is provided with a sample inlet 1011, and a ceramic shell 1012 is mounted on the outer peripheral wall of the sampling part 101.
As shown in fig. 1, the sampling part 101 is located at the left part of the housing 1, and the sealing part 102 is located at the right part of the housing 1. The sampling part 101 is a tubular object arranged along the left-right direction, the diameter of the sampling part 101 is smaller than the width of the sealing part 102, the left end of the sampling part 101 is provided with a sample inlet 1011, and the outer peripheral wall of the sampling part 101 is sleeved with a ceramic shell 1012. The sampling part 101 is inserted into the coal mill, sample gas in the coal mill is adopted, and 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 disclosed by the embodiment of the invention under the condition of coal powder scouring in the coal mill is ensured.
A first end of the sampling tube 2 (the left end of the sampling tube 2 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 detection instrument, the sampling tube 2 is used for conveying the sample gas collected by the casing 1 to a subsequent detection system, and it can be understood that the sample gas is dust gas generated in the coal mill.
In casing 1 was located to one-level filter core 3, the first end of one-level filter core 3 (the left end of one-level filter core 3 shown in fig. 1) was located sampling portion 101 and was close to inlet 1011, the second end of one-level filter core 3 (the right-hand member of one-level filter core 3 shown in fig. 1) was located sealing 102, gaseous through inlet 1011 get into sampling portion 101 in and filter the entering sealing 102 back through one-level filter core 3, get into in the sampling tube 2 through sample gas inlet 201.
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. The sample gas enters the collection part and enters the inner cavity of the primary filter element 3 after being filtered by the primary filter element 3, the aperture of the filter hole of the primary filter element 3 is 5 mu m, and large-particle dust in the sample gas is blocked outside the primary filter element 3, so that the sample gas is subjected to primary filtering. 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 assembly 4 is disposed in the casing 1, the dust sweeping assembly 4 includes a sleeve 401 and a plurality of brushes 402, the sleeve 401 is slidable along an extending direction (left and right directions as shown in fig. 1) of the one-stage filter element 3, at least a portion of the one-stage filter element 3 is disposed in the sleeve 401, and the brushes 402 are disposed on an inner wall of the sleeve 401 and contact with an outer peripheral wall of the one-stage filter element 3.
As shown in fig. 1, the central axis of the sleeve 401 is arranged along the left-right direction, the sleeve 401 is sleeved on the primary filter element 3, the inner wall of the sleeve 401 is spaced apart 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 spirally and uniformly distributed on the inner wall of the sleeve 401 along the axial direction of the sleeve 401, and the plurality of brushes 402 are all positioned in the collecting part. In the process that the sleeve 401 slides in the left-right direction, the brush 402 cleans the outer wall of the first-stage filter element 3, large-particle dust adsorbed after sample gas is filtered on the first-stage filter element 3 is swept down, and the position where the brush 402 cleans the first-stage filter element 3 is located in the sampling part 101.
And the first air blowing pipe 5 is communicated with the inner cavity of the sampling part 101, and is used for blowing the dust in the sampling part 101 out of the machine shell 1 through the sample inlet 1011.
As shown in fig. 1, the circumferential wall of the sampling part 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. The compressed air provided by the compressor is delivered to the air blowing port through the first air blowing pipe 5 and blown into the inner cavity of the sampling part 101. The air blowing port is arranged towards the direction of the first-stage filter element 3, so that compressed air of the air blowing port mainly blows dust attached to the first-stage filter element 3 and blows the dust in the sampling part 101 back to the coal grinding machine through the sample inlet 1011 along with high-pressure air flow.
Therefore, most of floating dust on the first-stage filter element 3 is removed by blowing air through the first air blowing pipe 5, the dust sweeping assembly 4 utilizes the brush 402 to sweep stubborn dust attached to the first-stage filter element 3, the reliability of the dust removal function is improved, the blocking rate of the coal mill outlet anti-blocking sampling device 100 in the embodiment of the invention is reduced when sampling is carried out in the coal mill, and the sampling efficiency is indirectly improved.
According to the coal mill outlet anti-blocking sampling device 100, the outer peripheral wall of the sampling part 101 is protected by the ceramic shell 1012, the service life of the sampling part 101 under the condition of coal powder washing in a coal mill is guaranteed, the arranged first air blowing pipe 5 and the dust sweeping component 4 regularly sweep the first-stage filter element 3, the dust removal effect of the sampling device 100 is improved, the stable operation of the sampling device 100 is guaranteed, the blocking frequency is reduced, and therefore the maintenance cost of field workers is saved.
In some embodiments, as shown in fig. 1, the housing 1 further includes a partition 103 separating the sampling part 101 and the sealing part 102, and the partition 103 is provided with a blocking hole for communicating the sealing part 102 and the sampling part 101.
It is 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 constitute the inner cavity of the housing 1. The partition 103 is provided in the housing 1 at a portion where the sampling part 101 and the sealing part 102 are connected.
Stifled sampling device 100 is prevented in coal pulverizer export still includes supporting component 6, and supporting component 6 is located in sealing 102, and supporting component 6 includes supporting platform 601, is equipped with the through-hole on the supporting platform 601, and sleeve 401 runs through the separation hole, and sleeve 401 at least part be located the through-hole and link to each other with supporting platform 601 slidable. The first-stage 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 far away from the blocking hole.
Alternatively, as shown in fig. 1, the supporting platform 601 is connected to the inner wall of the casing 1, the central axis of the blocking hole and the central axis of the through hole are both arranged in the left-right direction, and the central axis of the sleeve 401, the central axis of the blocking hole and the central axis of the through hole are coaxial.
A flange 6011 is arranged on the supporting platform 601, the flange 6011 is fixed on the supporting 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 located on the right side of the supporting 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 extends 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 are all abutted to the outer wall of the sleeve 401, and when the sleeve 401 slides in the left-right direction, the balls rotate relatively around the center of the ball and the annular body 6012 to reduce friction force when the sleeve 401 slides.
In some embodiments, as shown in fig. 1 and 2, the dust collection assembly 4 further comprises a connection block 403, the connection block 403 is located on a side of the support platform 601 adjacent to the blocking hole (e.g., the left side of the support platform 601 shown in fig. 1), and the sleeve 401 extends through the connection block 403 and is connected to the connection block 403.
It will be appreciated that the abutment 403 comprises a disc having a central axis which is axially coaxial with the centre of the sleeve 401, and a lug associated with the disc, the lug being located radially on the circumferential side of the disc. A through hole is formed in the disc, 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 and right direction shown in fig. 1) of the primary filter element 3, the guide rod 602 penetrates the connection platform 403, one end of the guide rod 602 is connected to the 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 platform 403 along the left-right direction, the guide rod 602 penetrates through the guide hole, the left end of the guide rod 602 is connected to the inner wall of the casing 1, and the right end of the guide rod 602 is connected to the supporting platform 601. Therefore, during the sliding process of the sleeve 401 from side to side, the guide rod 602 functions as a guide support, so that the sleeve 401 does not move up and down.
In some embodiments, as shown in fig. 1, a first bellows 7 and a second bellows 8 are further included, and both the first bellows 7 and the second bellows 8 are disposed around the sleeve 401. The first bellows 7 is located between the connection stage 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 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 stage 403, and the first bellows 7 defines a first dust-blocking space 701 in the sealing portion 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 connecting station 403 is the left surface of the disk and the second surface of the connecting station 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 both 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 machine 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 corrugated pipe 8 is provided with a third sealing connecting seat, the left end of the second corrugated pipe 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 a bolt, and the fourth sealing connecting seat is connected with the right surface of the disc through a bolt.
A 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 inside the sealing portion 102 except for 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 coal dust of the coal mill is prevented from influencing the sampling part 101 of the sampling device 100 and components outside the first dust-blocking space 701. In addition, the sealing performance of the sampling device 100 is improved, if the casing 1 located in the sealing portion 102 is damaged, the first dust blocking space 701 can further prevent the coal mill from being communicated with the external environment, and coal dust in the coal mill is prevented from leaking to the external environment through the sampling device 100.
In some embodiments, as shown in fig. 1, the second bellows 8 defines a second dust-blocking space 801 in the sealing portion 102, the connecting table 403 is provided with a first vent 4031 penetrating the connecting table 403, and the first vent 4031 connects the first dust-blocking space 701 and 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 the blocking holes.
Alternatively, as shown in fig. 1, the second dust-proof 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 in the disk and penetrates through the disk in the left-right direction, so that the first dust-proof space 701 communicates with the second dust-proof 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 an 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 portion 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 ventilation opening 4031 is opened in the connection base 403 so that the compressed air supplied from the second blowing pipe 9 can simultaneously fill the first dust-proof space 701 and the second dust-proof space 801.
The second blowing pipe 9 has a dust removing effect on the first dust-proof space 701 and the second dust-proof space 801, and blows out dust in the first dust-proof space 701 and the second dust-proof space 801 through the blocking holes.
In some embodiments, as shown in fig. 1, the partition 103 is a graphite bearing for blocking dust from entering the first dust-blocking space 701, a second vent 4011 is opened on the peripheral wall of the sleeve 401, and the second vent 4011 connects the inner cavity of the sleeve 401 with the first dust-blocking space 701 and/or the second dust-blocking 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 connected in sequence, 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 decreases from left to right in sequence. First cylindric section and slant section all are located graphite bearing's left side, and the separation hole is run through to the second cylindric section.
The inner hole of the graphite bearing is the blocking hole of 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 in contact with the outer wall of the second cylindrical section. The outer diameter of the graphite bearing is the same as the inner diameter of the collecting part, and the outer wall of the graphite bearing is attached to and connected with the inner wall of the collecting part.
Therefore, the oblique section has a certain limiting effect, so that in the process of sliding the sleeve 401 left and right, the sleeve 401 slides rightwards until the oblique section contacts the graphite bearing, and the sleeve 401 cannot slide rightwards continuously. And the adsorption characteristic of the graphite bearing can prevent a large amount of dust in the coal mill from entering the first anti-settling space.
Alternatively, as shown in fig. 1, there are two second vent ports 4011, wherein one second vent port 4011 is located in the first anti-settling space such that the first dust-proof space 701 communicates with the inner cavity of the sleeve 401, and the other second vent port 4011 is located in the second anti-settling space such that the second dust-proof space 801 communicates with the inner cavity of the sleeve 401.
Therefore, the second gas blowing pipe 9 blows dust in the first dust blocking space 701 and the second dust blocking space 801 from the second vent 4011 into the sleeve 401, and blows the dust back into the coal mill along the inner cavity of the sleeve 401. And the second gas blowing pipe 9 also has a purging effect on the first-stage filter element 3 in the sleeve 401, so that the dust removal effect is further improved.
In some embodiments, as shown in fig. 1, further comprising a protective tube 10 and an inner blow tube 12, the protective tube 10 is disposed on a side of the support platform 601 remote from the blocking 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 (the right end of the first-stage filter element 3 in fig. 1) of the first-stage filter element 3 is provided with the exhaust port 301, the second-stage filter element 11 is arranged in the protection tube 10, the first end (the left end of the second-stage filter element 11 in fig. 1) of the second-stage filter element 11 is provided with the air inlet 111 opposite to the exhaust port 301, and the sample gas filtered by the first-stage filter element 3 sequentially flows into the second-stage filter element 11 through the exhaust port 301 and the air inlet 111. The first end of the sampling tube 2 is inserted into the protection tube 10, the second end of the secondary filter element 11 (as shown in fig. 1, the right end of the secondary filter element 11) is adjacent to the sample gas inlet 201, and the inner blowing tube 12 is communicated with the inner cavity of the secondary filter element 11.
Alternatively, as shown in fig. 1, a protective tube 10 is disposed in the left-right direction, the center axis of the protective tube 10 is coaxial with the center axis of the through hole, the protective tube 10 is fitted in the center hole of the flange 6011, and the left end of the protective tube 10 is open. The left end of the sampling tube 2 is inserted into the protection tube 10, and the sample gas inlet 201 is located at the right end of the protection tube 10. The peripheral wall of the secondary filter element 11 is attached to the inner peripheral wall of the protective tube 10, the right end of the secondary filter element 11 is close to the sample gas inlet 201, and the diameter of the filter hole of the secondary filter element 11 is 2 micrometers.
The sample gas filtered by the first-stage filter element 3 flows out from the exhaust port 301 from left to right along the inner cavity of the first-stage filter element 3 and enters the second-stage filter element 11 from the air inlet 111. Then the filtered gas is discharged to the right end of the protection tube 10 after being filtered by 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 adopting the first-stage filter element 3 and the second-stage filter element 11 improves the cleanliness of the sample gas and prevents pollution to subsequent sample gas detection instruments.
Optionally, the left end of the inner blow pipe 12 sequentially penetrates through the protection pipe 10 and the secondary filter element 11, so that the inner blow pipe 12 is communicated with the inner cavity of the secondary filter element 11, and the right end of the inner blow pipe 12 is connected with an external compressor. Compressed air enters the secondary filter element 11 through the internal 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, an internal blowing dust removal mode of the filter element is realized, and the dust removal effect of the filter element is further improved.
In some embodiments, as shown in fig. 1, a heater 13 and a thermocouple 14 are further included, the heater 13 and the thermocouple 14 are both disposed on the protective tube 10, the heater 13 is used for heating the sample gas in the protective 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 circumferential wall of the protection tube 10, and the sample gas in the protection tube 10 is heated by the heater 13 to evaporate moisture in the sample gas, reduce the dew point, and prevent the sample gas containing moisture from entering the sampling tube 2, causing condensation on the pipeline, and affecting subsequent sample gas detection.
In some embodiments, as shown in fig. 1, the device further comprises a power assembly 15 disposed on the support platform 601, wherein the power assembly 15 is connected to the connection platform 403 and is used for pushing the connection platform 403.
Alternatively, as shown in fig. 1, the power assembly 15 is an air cylinder, the air cylinder is mounted on the supporting platform 601 and located at the right side of the supporting platform 601, an extending hole is formed in the supporting platform 601, a push rod of the air cylinder extends through the extending hole, and the left end of the push rod of the air cylinder is connected with the projection. The push rod motion of cylinder drives sleeve 401 horizontal slip, and the extension length of cylinder is less than the length that sleeve 401 right-hand member is located the through-hole, guarantees that cylinder motion in-process, and sleeve 401's right-hand member can not break away from the through-hole.
It can be appreciated that, because the sampling device 100 is installed at the outlet of the coal mill with attention to explosion protection, the dust sweeping assembly 4 is driven pneumatically to sweep the primary filter element 3, thereby improving the safety of the sampling device 100.
Specifically, the first blowing pipe 5, the second blowing pipe 9, the inner blowing pipe 12 and the air cylinder are all provided with compressed air by the compressor, a first air path is arranged between the first blowing pipe 5 and the compressor, a second air path is arranged between the second blowing pipe 9 and the compressor, a third air path is arranged between the inner blowing pipe 12 and the compressor, and a fourth air path is arranged between the air cylinder and the compressor. And control valves for controlling the on-off of the air flow are arranged on the first air path, the second air path, the third air path and the fourth air path.
The method for installing the anti-blocking sampling device 100 for the outlet of the coal mill 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, close 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 coal mill outlet anti-blocking sampling device 100 of the above embodiment is installed on the coal mill 200 through the installation hole, so that the sampling part 101 is located in the coal mill 200, and the installation hole is sealed, 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 part 101 is located inside the coal mill 200, the sealing part 102 is located outside the coal mill 200, and the sample gas in the coal mill 200 enters the sampling part 101 through the sample inlet 1011, and enters the sampling pipe 2 through the sample gas inlet 201 after being filtered by the first-stage filter element 3 and the second-stage 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 assembly 4 and a multi-path internal and external back blowing combined air blowing pipe greatly reduce the blocking condition of a filter element.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a stifled sampling device is prevented in coal pulverizer export which characterized in that includes:
the sampling device comprises a shell, a sampling part and a sealing part, wherein 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 installed 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, is filtered by the first-stage filter element, enters the sealing part and then enters the sampling pipe through the sample gas inlet;
the dust sweeping assembly is arranged in the machine 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 outer 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 out dust in the sampling part from the shell through the sample inlet.
2. The coal pulverizer outlet blockage prevention sampling device according to claim 1, wherein the casing further comprises a partition separating the sampling part from the sealing part, and a blocking hole for communicating the sealing part with the sampling part is formed in the partition;
the anti-blocking sampling device for the coal mill outlet further comprises a supporting assembly, the supporting assembly is arranged in the sealing part and 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 located in the through hole and is connected with the supporting platform in a sliding mode;
the one-level filter core runs through in proper order the separation hole with the through-hole and with supporting platform links to each other, the appearance gas inlet is located supporting platform keeps away from one side in separation hole.
3. The coal pulverizer outlet blockage prevention sampling device of claim 2, wherein the dust sweeping assembly further comprises a connection platform located on a side of the support platform adjacent to the blocking hole, and the sleeve penetrates through and is connected with the connection platform;
the supporting component further comprises a guide rod arranged in the extending direction of the primary filter element, the guide rod penetrates through the connecting platform, one end of the guide rod is connected with the inner wall of the casing, and the other end of the guide rod is connected with the supporting platform.
4. The coal mill outlet blockage prevention sampling device of claim 3, further comprising a first bellows and a second bellows, both of which are disposed around the sleeve;
the first corrugated pipe is positioned between the connecting platform and the blocking hole, one end of the first corrugated pipe is close to the blocking hole and is 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 platform, 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 platform 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 platform.
5. The coal pulverizer outlet blockage prevention sampling device of claim 4, wherein the second bellows defines a second dust-blocking space within the sealing portion, the connection platform is provided with a first vent through the connection platform, and the first vent communicates the first dust-blocking space with the second dust-blocking space;
the coal mill outlet anti-blocking sampling device 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 out dust in the first dust blocking space and the second dust blocking space from the blocking hole.
6. The anti-blocking sampling device for the coal mill outlet according to claim 5, wherein the partition is a graphite bearing, the graphite bearing is used for blocking dust from entering the first dust-blocking space, a second vent is formed in a peripheral wall of the sleeve, and the second vent connects an inner cavity of the sleeve with the first dust-blocking space and/or the second dust-blocking space.
7. The anti-blocking sampling device for the outlet of the coal mill as claimed in claim 2, further comprising a protection tube and an inner blow tube, wherein the protection tube is arranged on one side of the supporting platform away from the blocking hole;
the first-stage filter element is connected with the protection tube, the second end of the first-stage filter element is provided with an air outlet, a second-stage filter element is arranged in the protection tube, the first end of the second-stage filter element is provided with an air inlet opposite to the air outlet, sample gas filtered by the first-stage filter element sequentially passes through the air outlet and the air inlet and flows into the second-stage filter element, the first end of the sampling tube is arranged in the protection tube in a penetrating mode, the second end of the second-stage filter element is adjacent to the sample gas inlet, and the inner blowpipe is communicated with the inner cavity of the second-stage filter element.
8. The coal pulverizer outlet anti-blocking sampling device of claim 7, further comprising a heater and a thermocouple, wherein the heater and the thermocouple are both disposed 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.
9. The coal pulverizer outlet blockage prevention sampling device of claim 3, further comprising a power assembly disposed on the support platform, wherein the power assembly is connected with the connection platform and is used for pushing the connection platform.
10. The installation method of the anti-blocking sampling device for the outlet of the coal mill is characterized by comprising the following steps of:
the coal pulverizer is provided with a mounting hole at a position adjacent to the powder outlet, and the axial direction of the mounting hole is consistent with the powder outlet direction of the coal pulverizer;
the coal mill outlet blockage prevention sampling device of any one of claims 1-9 is mounted on a coal mill through the mounting hole such that the sampling portion is located within the coal mill and the mounting hole is sealed, 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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Cited By (1)
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| CN115301645A (en) * | 2022-10-11 | 2022-11-08 | 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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| CN114354284B (en) | 2023-07-14 |
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