CN114479947A - Pulverized coal conveying system and using method thereof - Google Patents

Abstract

The invention discloses a pulverized coal conveying system and a using method thereof, wherein the pulverized coal conveying system comprises a pulverized coal bin, a first fluidizing device and a second fluidizing device, the pulverized coal bin comprises a first section and a second section, the first section is arranged at the upper part of the second section, the first section defines a first containing part, the second section defines a second containing part, the first containing part is communicated with the second containing part, the upper end part of the first section is provided with a pulverized coal inlet, the lower end part of the second section is provided with a pulverized coal outlet, the cross-sectional area of the second section is gradually reduced from top to bottom, each of the first fluidizing device and the second fluidizing device is arranged on the second section, and the second fluidizing device and the first fluidizing device are arranged at intervals. The pulverized coal conveying system provided by the embodiment of the invention has the advantages of good pulverized coal fluidization effect, high safety and the like.

Description

Pulverized coal conveying system and using method thereof

Technical Field

The invention relates to the technical field of pulverized coal conveying, in particular to a pulverized coal conveying system and a using method thereof.

Background

The pulverized coal in the pulverized coal bin is smoothly conveyed into the stokehold bin through fluidization, which is a necessary condition for ensuring the production of the rotary kiln, the upper end of the outer side of the lower inclined cylinder section of the pulverized coal bin is provided with an annular conveying pipeline, a plurality of injection pipes are circumferentially arranged along the annular conveying pipeline, and an injection end extends into the lower inclined cylinder section to inject the pulverized coal in the pulverized coal tower so as to fluidize the pulverized coal. In the related art, the fluidization effect of the lower inclined cylinder section of the pulverized coal tower is poor, so that the pulverized coal is easy to harden and even blocks a fluidization device, the smooth conveying of the pulverized coal is influenced, and the potential safety hazard is large.

Disclosure of Invention

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 the invention provides a pulverized coal conveying system to improve the fluidizing effect and safety of pulverized coal.

The embodiment of the invention also provides a using method of the pulverized coal conveying system, so as to improve the fluidization effect and safety of the pulverized coal.

The pulverized coal conveying system comprises a pulverized coal bin, a first fluidizing device and a second fluidizing device. The coal powder bin comprises a first section and a second section, the first section is arranged on the upper portion of the second section, the first section defines a first containing portion, the second section defines a second containing portion, the first containing portion is communicated with the second containing portion, the upper end portion of the first section is provided with a coal powder inlet, the lower end portion of the second section is provided with a coal powder outlet, and the cross sectional area of the second section is gradually reduced from top to bottom.

Each of the first and second fluidising means is provided on the second section, the second and first fluidising means being spaced apart.

The first fluidizing device comprises a first injection pipe, the first injection pipe is provided with a first inner port and a first outer port which are opposite in the inner and outer directions, the first outer port is used for being communicated with an air source, the first inner port is communicated with the second accommodating part, the first injection pipe is obliquely arranged, the first inner port is positioned above the first outer port, the second injection pipe is provided with a second inner port and a second outer port which are opposite in the inner and outer directions, the second outer port is used for being communicated with the air source, the second inner port is communicated with the second accommodating part, the second injection pipe is obliquely arranged, and the second inner port is positioned below the second outer port.

The pulverized coal conveying system provided by the embodiment of the invention has the advantages of good pulverized coal fluidization effect, high safety and the like.

In some embodiments, said first injection lance is angled at an angle of 20 ° to 40 ° to the horizontal and/or said second injection lance is angled at an angle of 20 ° to 40 ° to the horizontal.

In some embodiments, each of the first fluidizing device and the second fluidizing device is provided in plurality, and the first fluidizing device and the second fluidizing device are alternately arranged at intervals in the circumferential direction of the pulverized coal bunker.

In some embodiments, the coal fines delivery system further includes a plurality of third fluidization devices and a plurality of fourth fluidization devices. The third fluidizing devices are arranged on the second section, the plurality of third fluidizing devices are arranged at intervals along the circumferential direction of the pulverized coal bunker, and the third fluidizing devices are arranged above the first fluidizing device. The fourth fluidizing devices are arranged on the second section, the fourth fluidizing devices are arranged at intervals along the circumferential direction of the pulverized coal bin, and the fourth fluidizing devices are arranged below the first fluidizing devices.

The third fluidizing device comprises a third injection pipe, the third injection pipe is provided with a third inner port and a third outer port which are opposite in the inner and outer directions, the third outer port is used for being communicated with an air source, the third inner port is communicated with the second accommodating part, the third injection pipe is obliquely arranged, the third inner port is positioned above the third outer port, the fourth fluidizing device comprises a fourth injection pipe, the fourth injection pipe is provided with a fourth inner port and a fourth outer port which are opposite in the inner and outer directions, the fourth outer port is used for being communicated with the air source, the fourth inner port is communicated with the second accommodating part, the fourth injection pipe is obliquely arranged, and the fourth inner port is positioned above the fourth outer port.

In some embodiments, the pulverized coal conveying system further comprises a fifth injection pipe and a sealing cover. The fifth injection pipe is arranged on the second section, and is provided with a fifth inner port and a fifth outer port which are opposite in the inner and outer directions, the fifth outer port is used for being communicated with an air source, the fifth inner port is communicated with the second accommodating part, the fifth injection pipe is obliquely arranged, and the fifth inner port is positioned above the fifth outer port; the sealing cover is detachably arranged on the fifth outer port and used for plugging the fifth outer port.

In some embodiments, the fifth injection pipe is provided in plurality, and a plurality of the first fluidizing devices, a plurality of the second fluidizing devices, and a plurality of the fifth injection pipes are alternately arranged in sequence along the circumferential direction of the pulverized coal bunker.

In some embodiments, the pulverized coal delivery system further comprises a bin pump, a stokehole bin, and a differential pressure measurement device. The bin pump is provided with a bin pump inlet and a bin pump outlet, and the bin pump inlet is communicated with the pulverized coal outlet. The stokehole bin is provided with a stokehole bin inlet and a stokehole bin outlet, the stokehole bin inlet is communicated with the bin pump outlet, the stokehole bin outlet is used for pulverized coal to flow out, and a powder bin cloth bag is arranged in the stokehole bin. The pressure difference measuring device is arranged on the powder bin cloth bag to monitor the internal and external pressure difference of the powder bin cloth bag.

The use method of the pulverized coal conveying system provided by the embodiment of the invention comprises the following steps: when the pulverized coal conveying system works normally, the first fluidizing device and the second fluidizing device are started, so that pulverized coal in the second section is suspended in the second accommodating part.

The pulverized coal conveying system provided by the embodiment of the invention has the advantages of good pulverized coal fluidization effect, high safety and the like.

In some embodiments, when the pulverized coal conveying system is in normal operation, part of the first fluidizing device and part of the second fluidizing device are opened.

In some embodiments, when the pulverized coal conveying system is in normal operation, part of the first fluidizing device, part of the second fluidizing device and all of the fourth fluidizing device are opened.

When the pulverized coal conveying system works abnormally, all the first fluidizing devices and all the second fluidizing devices are started firstly;

then, if the pulverized coal conveying system still works abnormally, all the third fluidizing devices are started;

and then, if the pulverized coal conveying system still works abnormally, the sealing cover is detached so as to blow the fluidizing gas into the second accommodating part through the fifth injection pipe.

Drawings

Fig. 1 is a schematic structural view of a pulverized coal conveying system according to an embodiment of the present invention.

FIG. 2 is another view of the pulverized coal conveying system according to the embodiment of the present invention

Reference numerals:

a pulverized coal bunker 1; a second segment 101; a pulverized coal outlet 1011; a blanking valve 1012;

a first fluidizing device 2; a first fluidization conduit 201; a first fluidization plate 202; a first valve 203; a first fluidization box 204; a first blowing pipe 205;

a second fluidizing device 3; a second fluidization conduit 301; a second fluidization plate 302; a second valve 303; a second fluidization box 304; a second blowing pipe 305;

a third fluidizing device 4; a third fluidizing pipe 401; a third fluidization plate 402; a third valve 403; a third fluidization box 404; a third blowing pipe 405;

a fourth fluidizing device 5; a fourth fluidizing pipe 501; a fourth fluidization plate 502; a fourth valve 503; a fourth fluidization box 504; a fourth blowing pipe 505;

a fifth blowing pipe 6;

a first annular duct 7;

a second toroidal tube 8;

and a sealing cover 9.

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 technical solution of the present application is described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the pulverized coal conveying system according to the embodiment of the present invention includes a pulverized coal bunker 1, a first fluidizing device 2, and a second fluidizing device 3. The pulverized coal bunker 1 comprises a first section and a second section 101, the pulverized coal bunker 1 comprises the first section (not shown in the figure) and the second section 101, the first section is arranged on the upper portion of the second section 101, the first section defines a first containing portion, the second section 101 defines a second containing portion, the first containing portion is communicated with the second containing portion, the upper portion of the first section is provided with a pulverized coal inlet, a pulverized coal outlet 1011 is arranged on the lower portion of the second section 101, and the cross-sectional area of the second section 101 is gradually reduced from top to bottom.

Each of the first fluidizing means 2 and the second fluidizing means 3 is provided on the second section 101, the second fluidizing means 3 being provided spaced apart from the first fluidizing means 2.

The second fluidizing device 3 and the first fluidizing device 2 are arranged at intervals, and the first fluidizing device 2 and the second fluidizing device 3 are arranged at intervals in the vertical direction. Alternatively, the first fluidization device 2 and the second fluidization device 3 are arranged at intervals along the circumferential direction of the pulverized coal bunker 1.

The first fluidizing device 2 includes a first injection pipe 205, the first injection pipe 205 has a first inner port and a first outer port opposite to each other in the inner and outer directions, the first outer port is used for being communicated with an air source, the first inner port is communicated with the second accommodating portion, the first injection pipe 205 is obliquely arranged, and the first inner port is located above the first outer port. The second blowing pipe 305 has a second inner port and a second outer port which are opposite in the inward and outward direction, the second outer port is used for being communicated with the air source, the second inner port is communicated with the second accommodating portion, the second blowing pipe 305 is obliquely arranged, and the second inner port is located below the second outer port.

As shown in fig. 1, the first blowing pipe 205 is inclined gradually downward from the outside to the inside, and the second blowing pipe 305 is inclined gradually upward from the outside to the inside. That is, the blowing direction of the first blowing tube 205 is obliquely downward, and the blowing direction of the second blowing tube 305 is obliquely upward.

When fluidizing the pulverized coal in the pulverized coal bunker 1, the pulverized coal conveying system according to the embodiment of the present invention makes the air source (e.g., compressed air) enter the first injection pipe 205 through the first outer port, and inject the pulverized coal into the second section 101 obliquely downward through the first inner port, and makes the air source enter the second injection pipe 305 through the second outer port, and inject the pulverized coal into the second section 101 obliquely upward through the second inner port. From this, under the effect of the buggy in the second accommodation portion jetting in first injection pipe 205 slant downwards and the jetting of second injection pipe 305 slant upwards, the buggy suspension in the second accommodation portion is in the second accommodation portion and along the upset of upper and lower direction, thereby the suspension effect of reinforcing buggy, make the fluidization effect of buggy better, thereby can greatly reduced avoid the buggy to take place the risk that hardens because of the fluidization effect is poor even, and pile up dead angle department, effectively guarantee the smooth transport of buggy.

In addition, first injection pipe 205 sets up downwards to one side, when satisfying that the buggy fluidization is effectual, can also avoid the buggy because of taking place to harden in getting into first injection pipe 205, and the problem of blockking up first injection pipe 205, and then can greatly reduced avoid first injection pipe 205 to cause the risk of pipeline explosion or even buggy storehouse 1 explosion because of blockking up even, the security is higher.

Therefore, the pulverized coal conveying system provided by the embodiment of the invention has the advantages of good pulverized coal fluidization effect, high safety and the like.

Optionally, the compressed gas is compressed air or compressed nitrogen.

Alternatively, as shown in fig. 1, the first fluidizing device 2 comprises a first fluidizing box 204 and a first fluidizing plate 202, the first fluidizing plate 202 is installed in the first fluidizing box 204, the first external port is communicated with the first fluidizing box 204, and the first fluidizing box 204 is communicated with the gas source, so that the gas source is blown into the second accommodating portion through the first fluidizing plate 202 after flowing into the first fluidizing box 204.

The second fluidization device 3 includes a second fluidization box 304 and a second fluidization plate 302, the second fluidization plate 302 is installed in the second fluidization box 304, the second external port is communicated with the second fluidization box 304, and the second fluidization box 304 is communicated with a gas source, so that the gas source is blown into the second accommodation portion through the second fluidization plate 302 after flowing into the second fluidization box 304.

For example, as shown in fig. 1, the first injection pipe 205 is welded to the outer wall surface of the second section 101, the first fluidization plate 202 is clamped in the first fluidization plate 204 to replace the first fluidization plate 202, and the first fluidization plate 204 is bolted to the first injection pipe 205 and installed at the first outer port. The second injection pipe 305 is welded on the outer wall surface of the second section 101, the second fluidization plate 302 is clamped in the second fluidization plate 304 so as to replace the second fluidization plate 302, and the second fluidization plate 304 is connected with the second injection pipe 305 through bolts and is arranged at the first outer port.

Thus, by providing the fluidization box and the fluidization plate in each of the first fluidization device 2 and the second fluidization device 3, the fluidization effect of the first fluidization device 2 and the second fluidization device 3 is further improved, and the fluidization effect of the pulverized coal conveying system according to the embodiment of the present invention is further improved.

In some embodiments, the first injection lance 205 is angled from 20 ° to 40 ° from horizontal.

For example, as shown in fig. 1, the first injection tube 205 is angled 30 ° from horizontal.

Therefore, the included angle between the first injection pipe 205 and the horizontal plane is set to be 20-40 degrees, so that the coal dust in the second accommodating part can be more effectively turned over in the vertical direction by being matched with the second fluidizing device 3, the suspension effect of the coal dust can be further enhanced, and the fluidizing effect of the coal dust conveying system in the embodiment of the invention can be further improved.

In some embodiments, the second injection tube 305 is angled from 20 ° to 40 ° from horizontal.

For example, as shown in fig. 1, the second injection tube 305 is angled 30 ° from the horizontal.

Therefore, the included angle between the second injection pipe 305 and the horizontal plane is set to be 20-40 degrees, so that the coal dust in the second accommodating part can be more effectively turned over in the vertical direction by being matched with the second fluidizing device 3, the suspension effect of the coal dust can be further enhanced, and the fluidizing effect of the coal dust conveying system in the embodiment of the invention can be further improved.

In some embodiments, each of the first and second fluidization devices 2 and 3 is provided in plurality, and the plurality of first and second fluidization devices 2 and 3 are alternately arranged at intervals in the circumferential direction of the pulverized coal bunker 1.

As shown in fig. 1, the first fluidizing device 2 and the second fluidizing device 3 are on the same horizontal plane, and the plurality of first fluidizing devices 2 and the plurality of second fluidizing devices 3 are alternately arranged along the circumferential direction of the coal dust bin 1, so that the suspension effect of the coal dust can be further improved, and the fluidizing effect of the coal dust conveying system according to the embodiment of the present invention can be further improved.

In some embodiments, as shown in fig. 1, the pulverized coal conveying system of the embodiment of the present invention further includes a plurality of third fluidizing devices 4 and a plurality of fourth fluidizing devices 5. The third fluidizing devices 4 are arranged on the second section 101, a plurality of the third fluidizing devices 4 are arranged at intervals along the circumferential direction of the pulverized coal bunker 1, and the third fluidizing devices 4 are arranged above the first fluidizing device 2. The fourth fluidizing devices 5 are arranged on the second section 101, a plurality of the fourth fluidizing devices 5 are arranged at intervals along the circumferential direction of the pulverized coal bunker 1, and the fourth fluidizing devices 5 are arranged below the first fluidizing device 2.

The third fluidizing device 4 includes a third blowing pipe 405, the third blowing pipe 405 has a third inner port and a third outer port opposite to each other in the inward and outward direction, the third outer port is used for being communicated with an air source, the third inner port is communicated with the second accommodating portion, the third blowing pipe 405 is obliquely arranged, and the third inner port is located above the third outer port. The fourth fluidizing device 5 includes a fourth blowing pipe 505, the fourth blowing pipe 505 has a fourth inner port and a fourth outer port which are opposite in the inner and outer directions, the fourth outer port is used for being communicated with the gas source, the fourth inner port is communicated with the second accommodating portion, the fourth blowing pipe 505 is arranged in an inclined manner, and the fourth inner port is located above the fourth outer port.

As shown in fig. 1, the third blowing pipe 405 is gradually inclined upward from the outside inward, and the fourth blowing pipe 505 is gradually inclined upward from the outside inward. That is, the blowing direction of the third blowing tube 405 is obliquely upward, and the blowing direction of the fourth blowing tube 505 is obliquely upward.

When the pulverized coal conveying system according to the embodiment of the present invention fluidizes the pulverized coal in the pulverized coal bunker 1, the air source (e.g., compressed air) enters the third injection pipe 405 through the third outer port, and is injected obliquely upward into the pulverized coal in the second section 101 through the third inner port, and the air source enters the fourth injection pipe 505 through the fourth outer port, and is injected obliquely upward into the pulverized coal in the second section 101 through the fourth inner port.

Therefore, by arranging the plurality of third fluidizing devices 4 above the first fluidizing device 2 and the plurality of fourth fluidizing devices 5 below the first fluidizing device 2, the pulverized coal in the second accommodating portion is further increased in suspension effect in the second accommodating portion by the obliquely upward blowing action of the plurality of second fluidizing devices 3, the plurality of third fluidizing devices 4 and the plurality of fourth fluidizing devices 5, and the fluidizing effect of the pulverized coal conveying system according to the embodiment of the present invention is further improved.

Optionally, the third fluidizing device 4 comprises a third fluidizing box 404 and a third fluidizing plate 402, the third fluidizing plate 402 is installed in the third fluidizing box 404, the third external port is communicated with the third fluidizing box 404, and the third fluidizing box 404 is communicated with the gas source, so that the gas source is blown into the second accommodating portion through the third fluidizing plate 402 after flowing into the third fluidizing box 404.

The fourth fluidizing device 5 comprises a fourth fluidizing box 504 and a fourth fluidizing plate 502, the fourth fluidizing plate 502 is installed in the fourth fluidizing box 504, the fourth external port is communicated with the fourth fluidizing box 504, and the fourth fluidizing box 504 is communicated with the gas source, so that the gas source is blown into the second accommodating portion through the fourth fluidizing plate 502 after flowing into the fourth fluidizing box 504.

For example, as shown in fig. 1, the third blowing pipe 405 is welded to the outer wall surface of the second segment 101, the third fluidization plate 402 is clamped in the third fluidization box 404 so as to replace the third fluidization plate 402, and the third fluidization box 404 is connected to the third blowing pipe 405 by bolts and is installed at the third outer port. A fourth injection pipe 505 is welded to the outer wall surface of the second section 101, the fourth fluidization plate 502 is clamped in the fourth fluidization plate 504 so as to replace the fourth fluidization plate 502, and the fourth fluidization plate 504 and the fourth injection pipe 505 are connected by bolts and are installed at a fourth outer port.

Thus, by providing a fluidization box and a fluidization plate in each of the third fluidization device 4 and the fourth fluidization device 5, the fluidization effect of the third fluidization device 4 and the fourth fluidization device 5 is further improved, and the fluidization effect of the pulverized coal conveying system of the embodiment of the present invention is further improved.

Alternatively, the pulverized coal conveying pipe of the embodiment of the present invention includes a first fluidizing pipe 201, a second fluidizing pipe 301, a third fluidizing pipe 401, and a fourth fluidizing pipe 501. The first fluidizing pipes 201 are provided with a plurality of first fluidizing pipes 201, the plurality of first fluidizing pipes 201 correspond to the plurality of first injection pipes 205 one by one, the first fluidizing pipes 201 are provided with a first gas inlet and a first gas outlet, the first gas inlet is communicated with a gas source, and the first gas outlet is communicated with the first fluidizing box 204.

The second fluidizing pipe 301 has a plurality of second fluidizing pipes 301, the plurality of second fluidizing pipes 301 correspond to the plurality of second injection pipes 305 one by one, the second fluidizing pipe 301 has a second gas inlet and a second gas outlet, the second gas inlet is communicated with a gas source, and the second gas outlet is communicated with the second fluidizing box 304.

The third fluidizing pipes 401 are provided with a plurality of third fluidizing pipes 401, the plurality of third fluidizing pipes 401 correspond to the plurality of third blowing pipes 405 one by one, the third fluidizing pipes 401 are provided with a third gas inlet and a third gas outlet, the third gas inlet is communicated with a gas source, and the third gas outlet is communicated with the third fluidizing box 404.

The fourth fluidizing pipes 501 are provided with a plurality of fourth fluidizing pipes 501, the fourth fluidizing pipes 501 correspond to the fourth injection pipes 505 one by one, the fourth fluidizing pipes 501 are provided with a fourth gas inlet and a fourth gas outlet, the fourth gas inlet is communicated with a gas source, and the fourth gas outlet is communicated with the fourth fluidizing box 505.

For example, the first gas outlet is threadably coupled to the first fluidization cartridge 204, the second gas outlet is threadably coupled to the second fluidization cartridge 304, the third gas outlet is threadably coupled to the third fluidization cartridge 404, and the fourth gas outlet is threadably coupled to the fourth fluidization cartridge 504.

Therefore, by arranging the plurality of first fluidization pipes 201, the plurality of second fluidization pipes 301, the plurality of third fluidization pipes 401 and the plurality of fourth fluidization pipes 501, the connection between the gas source and the first fluidization device 2, the second fluidization device 3, the third fluidization device 4 and the fourth fluidization device 5 is convenient, and the installation of the pulverized coal conveying system in the embodiment of the invention is facilitated.

Optionally, a first valve 203 is disposed on the first fluidization pipe 201, the first valve 203 is used for controlling the gas source to enter the first fluidization box 204, a second valve 303 is disposed on the second fluidization pipe 301, and the second valve 303 is used for controlling the gas source to enter the second fluidization box 304. A third valve 403 is arranged on the third fluidization pipe 401, the third valve 403 is used for controlling the gas source to enter the third fluidization box 404, a fourth valve 503 is arranged on the fourth fluidization pipe 501, and the fourth valve 503 is used for controlling the gas source to enter the fourth fluidization box 504.

Therefore, by arranging a valve in each of the first fluidizing pipe 201, the second fluidizing pipe 301, the third fluidizing pipe 401 and the fourth fluidizing pipe 501, the air source can be controlled to enter the fluidizing box by controlling the opening and closing of the valves, so that the control of the air source is facilitated, and the operation of the pulverized coal conveying system in the embodiment of the invention is facilitated.

Optionally, the pulverized coal conveying system of the embodiment of the present invention further includes a first toroidal conduit 7 and a second toroidal conduit 8. Each of the first and second toroidal tubes 7 and 8 surrounds the outer circumferential surface of the second segment 101 by one turn, the first and second toroidal tubes 7 and 8 are mounted on the outer wall surface of the second segment 101, the first toroidal tube 7 is located above the second toroidal tube 8, and each of the first and second toroidal tubes 7 and 8 is in communication with a gas source. Each of the first 201, second 301 and fourth 501 fluidization ducts communicates with the second annular duct 8, the third fluidization duct 401 communicates with the first annular duct 7.

For example, as shown in fig. 1, the first and second annular pipes 7 and 8 are welded to the outer wall surface of the second segment 101, and each of the first, second, and fourth gas inlets is screwed to the second annular pipe 8. After entering the second annular duct 8, the gas source enters the first fluidization box 204 through the first gas inlet, the second fluidization box 304 through the second gas inlet, and the fourth fluidization box 504 through the fourth gas inlet, respectively. The third gas inlet is in threaded connection with the first annular pipeline 7, and a gas source enters the third fluidization box 404 through the third gas inlet after entering the first annular pipeline 7.

Therefore, the pulverized coal conveying system provided by the embodiment of the invention is further convenient for the connection of the gas source with the first fluidizing device 2, the second fluidizing device 3, the third fluidizing device 4 and the fourth fluidizing device 5 by arranging the first annular pipeline 7 and the second annular pipeline 8, and is further convenient for the installation of the pulverized coal conveying system provided by the embodiment of the invention.

In some embodiments, the pulverized coal conveying system of the present embodiment further includes a fifth injection pipe 6 and a sealing cover 9. The fifth injection pipe 6 is arranged on the second section 101, the fifth injection pipe 6 is provided with a fifth inner port and a fifth outer port which are opposite in the inner and outer directions, the fifth outer port is used for being communicated with an air source, the fifth inner port is communicated with the second accommodating part, the fifth injection pipe 6 is obliquely arranged, and the fifth inner port is positioned above the fifth outer port. A sealing cover 9 is detachably arranged on the fifth external port, and the sealing cover 9 is used for sealing off the fifth external port.

For example, as shown in fig. 2, the fifth injection pipes 6 are steel pipes having a pipe diameter of 80mm, four fifth injection pipes 6 are provided, the fifth injection pipes 6 are welded to the outer wall surface of the second stage 101 at regular intervals in the circumferential direction of the pulverized coal bunker, and the fifth injection pipes 6 are inclined downward from the outside to the inside. That is, the fifth blowing pipe 6 is inclined downward and at an angle to the horizontal. Therefore, the fifth injection pipe 6 is arranged obliquely downwards, so that the situation that the fifth injection pipe 6 is blocked due to hardening of the pulverized coal entering the fifth injection pipe 6 can be effectively prevented, and the safety of the pulverized coal conveying system in the embodiment of the invention is further improved.

The fifth blowing pipe 6 is a spare blowing pipe. That is to say, in the normal operation of the pulverized coal conveying system according to the embodiment of the present invention, the fifth injection pipe 6 is not used, and only when the first fluidizing device 2, the second fluidizing device 3, the third fluidizing device 4, and the fourth fluidizing device 5 are all opened, the problem of blocking of the pulverized coal outlet 1011 of the second section 101 of the pulverized coal conveying system still occurs, at this time, the sealing cover 9 on the fifth injection pipe 6 needs to be removed, and the compressed gas with a higher pressure is used for injecting the pulverized coal in the second accommodating portion through the fifth injection pipe 6, so that the suspension effect of the pulverized coal is further improved, and the fluidization effect of the pulverized coal conveying system according to the embodiment of the present invention is further improved.

Alternatively, the sealing cover 9 is a flange, and the sealing cover 9 is connected with the fifth blowing pipe 6 by bolts.

Alternatively, as shown in fig. 1 and 2, the fifth injection pipe 6 is provided in plural, and the plural first fluidizing devices 2, the plural second fluidizing devices 3, and the plural fifth injection pipes 6 are alternately arranged in order in the circumferential direction of the pulverized coal bunker 1.

Therefore, the fifth injection pipes 6 are arranged, and the first fluidizing devices 2, the second fluidizing devices 3 and the fifth injection pipes 6 are sequentially arranged at intervals in turn along the circumferential direction of the pulverized coal bunker 1, so that the suspension effect of pulverized coal is further improved, and the fluidization effect of the pulverized coal conveying system provided by the embodiment of the invention is further good.

In some embodiments, the pulverized coal conveying system of embodiments of the present invention further comprises a bin pump, a stokehole bin, and a differential pressure measurement device. The bin pump is provided with a bin pump inlet and a bin pump outlet, and the bin pump inlet is communicated with the pulverized coal outlet 1011. The stokehole bin is provided with a stokehole bin inlet and a stokehole bin outlet, the stokehole bin inlet is communicated with the bin pump outlet, the stokehole bin outlet is used for pulverized coal to flow out, and a powder bin cloth bag is arranged in the stokehole bin. The pressure difference measuring device is arranged on the powder bin cloth bag to monitor the internal and external pressure difference of the powder bin cloth bag.

The process of conveying the coal powder by the coal powder conveying system is also called a powdering process, wherein the powdering process comprises a blanking process and a powder conveying process, the blanking process refers to the process of feeding the coal powder in the coal powder bin 1 into the bin pump from the coal powder bin 1, and the powder conveying process refers to the process of feeding the coal powder in the bin pump into the stokehole bin.

Specifically, during blanking, negative pressure is applied to the bin pump, the pressure in the bin pump is smaller than that in the pulverized coal bin 1, and pulverized coal in the second section 101 flows out through the pulverized coal outlet 1011 and flows into the bin pump through the bin pump inlet under the action of the pressure difference between the pulverized coal bin 1 and the bin pump. When powder is conveyed, the blanking valve 1012 is closed, positive pressure is applied to the interior of the bin pump, the pressure in the bin pump is greater than that in the stokehole bin, and the pulverized coal in the bin pump flows out through the outlet of the bin pump and flows into the stokehole bin through the inlet of the stokehole bin under the action of the pressure difference between the bin pump and the stokehole bin.

In the powder grinding process, pressure difference can be generated inside and outside the powder bin cloth bag, and the pressure difference measuring device is used for monitoring the pressure difference inside and outside the powder bin cloth bag.

It should be noted that, when the powdering process is normal, the blanking time from the coal powder bin 1 to the bin pump is about 50s, the powder conveying time from the bin pump to the stokehole bin is about 70s, and the internal and external pressure difference of the powder bin cloth bag changes regularly, which can be understood as that the internal and external pressure difference of the powder bin cloth bag changes regularly in the two powdering processes.

For example, during normal powdering, the blanking time from the coal powder bin to the bin pump is about 50s, the powder conveying time from the bin pump to the stokehole bin is about 70s, and the change rule of the pressure difference of the cloth bags of the powder bins for powder twice before and after powdering is the same between-100 and 600 pa; when powder grinding is abnormal, the blanking time is abnormal (for example, the blanking time is far more than 50s), the powder conveying time is abnormal (for example, the powder conveying time is far more than 70s), or the change rule between the internal and external pressure difference of the cloth bags of the powder bin at the two times is different from that of the cloth bags of the powder bin at the previous time and that of the cloth bags at the next time, namely-100-600 pa.

Therefore, whether the powder grinding process is abnormal can be known only by observing whether the pressure difference change of the pressure difference measuring devices is regular or not, so that the powder grinding process of the pulverized coal conveying system provided by the embodiment of the invention is conveniently monitored.

Optionally, a discharging valve 1012 is arranged at the pulverized coal outlet 1011, and discharging of the pulverized coal from the pulverized coal outlet 1011 is controlled by controlling the discharging valve 1012, so that the pulverizing process is further conveniently controlled.

Optionally, the differential pressure measurement device is a differential pressure gauge.

Optionally, the pulverized coal conveying system of the embodiment of the invention further comprises a central control system and a pressure sensor, the differential pressure gauge is connected with the pressure sensor, and the pressure sensor is connected with a computer of the central control system so as to transmit a differential pressure signal detected by the differential pressure gauge to the central control system.

For example, the pressure difference meter transmits the detected internal and external pressure difference value of the powder bin cloth bag to a computer of a central control system through a pressure sensor, the internal and external pressure difference value is analyzed and converted into a time-dependent change curve chart through the computer of the central control system, and the curve chart is displayed through a computer interface and is observed by an operator.

Therefore, whether the powder grinding process is abnormal can be judged only by observing a change curve graph of the pressure difference of the powder bin cloth bag along with time, which is displayed on a computer interface of the central control system, so that the operation of the pulverized coal conveying system provided by the embodiment of the invention is further facilitated, and the practicability is high.

The use method of the pulverized coal conveying system provided by the embodiment of the invention comprises the following steps:

when the coal powder conveying system works normally, the first fluidizing device 2 and the second fluidizing device 3 are opened, so that the coal powder in the second containing part is suspended in the second containing part.

For example, as shown in FIG. 1, by opening the first valve 203 and the second valve 303, the gas source enters the first fluidizing means 2 and the second fluidizing means 3,

under the effect that the coal dust in the second containing part is obliquely injected downwards by the first fluidizing device 2 and obliquely injected upwards by the second fluidizing device 3, the coal dust in the second containing part is suspended in the second containing part and overturned in the up-and-down direction, so that the suspension effect of the coal dust is enhanced, and the fluidization effect of the coal dust is better. In addition, the first blowing pipe 205 of the first fluidizing device 2 is obliquely arranged downwards, so that the fluidization effect of the pulverized coal is good, and meanwhile, the problem that the pulverized coal blocks the first blowing pipe 205 due to hardening in the first blowing pipe 205 can be avoided, further, the risk that the first blowing pipe 205 causes pipeline explosion or even the pulverized coal bunker 1 explodes due to blocking can be greatly reduced or even avoided, and the safety is high.

Therefore, the use method of the pulverized coal conveying system has the advantages of good pulverized coal fluidization effect, high safety and the like.

Optionally, each of the first fluidizing device and the second fluidizing device is provided with a plurality of devices, and when the pulverized coal conveying system works normally, part of the first fluidizing device 2, part of the second fluidizing device 3 and all the fourth fluidizing devices 5 are opened

For example, as shown in fig. 1, in normal use, the second fluidizing devices 3 are opened one by one along the circumference of the coal dust bin, the first fluidizing devices are opened 2 times, the fourth fluidizing devices 5 are all opened, part of the first fluidizing devices 2 are opened by opening part of the first valves 203, part of the second fluidizing devices 3 are opened by opening part of the second valves 303, and all of the fourth fluidizing devices 5 are opened by opening all of the fourth valves 503.

Therefore, by opening part of the first fluidizing device 2 and part of the second fluidizing device 3, the amount of the gas source is saved while normal fluidization of the pulverized coal in the second accommodating part is ensured, and the cost is saved.

In some embodiments, when the pulverized coal conveying system is abnormally operated, all the first fluidizing devices 2 and all the second fluidizing devices 3 are firstly opened, then all the third fluidizing devices 4 are opened if the pulverized coal conveying system is still abnormally operated, and then the lower sealing cover 9 is detached to blow and blow the fluidizing gas into the second accommodating part through the fifth blowing pipe 6 if the pulverized coal conveying system is still abnormally operated.

For example, when the pulverized coal conveying system is abnormally operated (when the blanking time, the powder conveying time and the bag pressure of the powder bin are different), as shown in fig. 1, all the first valves 203 and the second valves 303 are opened to realize all the first fluidizing devices 2 and all the second fluidizing devices 3, so that the suspension effect on the pulverized coal is further improved, and the fluidization effect on the pulverized coal is further improved. Then, when the operation of the pulverized coal conveying system is still abnormal, all the third valves 403 are opened to open all the third fluidizing devices 4, so that the suspension effect on the pulverized coal is further improved, and the fluidization effect on the pulverized coal is further improved. If the coal powder conveying system still works abnormally, the connecting bolt on the lower sealing cover 9 is detached, and compressed gas with relatively higher pressure is injected into the second accommodating part through the fifth injection pipe 6, so that the suspension effect on the coal powder is further improved, and the fluidization effect on the coal powder is further improved.

After all the first fluidizing devices 2 and all the second fluidizing devices 3 are turned on, if the pulverized coal conveying system returns to normal operation, it is not necessary to turn on all the third fluidizing devices 4 and to blow the fluidizing gas into the second housing portion through the fifth blowing pipe 6. After all the third fluidizing devices 4 are opened, if the pulverized coal conveying system returns to normal operation, the fifth injection pipe 6 is not needed to inject fluidizing gas into the second accommodating part.

Therefore, when the coal powder conveying system works abnormally, the abnormity of the coal powder conveying system is solved by gradually opening the fluidizing devices at different positions and opening the fifth injection pipe 6, the abnormity of the coal powder conveying system is solved, and meanwhile, the using amount of an air source is saved, so that the cost is further saved.

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 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 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. A pulverized coal conveying system, comprising:

the coal powder bin comprises a first section and a second section, the first section is arranged at the upper part of the second section, the first section defines a first containing part, the second section defines a second containing part, the first containing part is communicated with the second containing part, the upper end part of the first section is provided with a coal powder inlet, the lower end part of the second section is provided with a coal powder outlet, and the cross-sectional area of the second section is gradually reduced from top to bottom; and

a first fluidizing device and a second fluidizing device, each of the first fluidizing device and the second fluidizing device being provided on the second section, the second fluidizing device and the first fluidizing device being provided at a spacing;

the first fluidizing device comprises a first injection pipe, the first injection pipe is provided with a first inner port and a first outer port which are opposite in the inner and outer directions, the first outer port is used for being communicated with an air source, the first inner port is communicated with the second accommodating part, the first injection pipe is obliquely arranged, the first inner port is positioned above the first outer port, the second injection pipe is provided with a second inner port and a second outer port which are opposite in the inner and outer directions, the second outer port is used for being communicated with the air source, the second inner port is communicated with the second accommodating part, the second injection pipe is obliquely arranged, and the second inner port is positioned below the second outer port.

2. The pulverized coal conveying system according to claim 1, wherein the angle between the first injection lance and the horizontal plane is 20 ° to 40 °; and/or

The included angle between the second blowing pipe and the horizontal plane is 20-40 degrees.

3. The pulverized coal conveying system according to claim 2, wherein each of the first fluidizing device and the second fluidizing device is provided in plurality, and the plurality of first fluidizing devices and the plurality of second fluidizing devices are alternately arranged at intervals in a circumferential direction of the pulverized coal bunker.

4. The pulverized coal conveying system according to claim 3, further comprising:

a plurality of third fluidizing devices arranged on the second section, the plurality of third fluidizing devices being arranged at intervals along the circumferential direction of the pulverized coal bunker, the third fluidizing devices being arranged above the first fluidizing device; and

a plurality of fourth fluidizing devices arranged on the second section, the plurality of fourth fluidizing devices being arranged at intervals along the circumferential direction of the pulverized coal bunker, the fourth fluidizing devices being arranged below the first fluidizing device;

the third fluidizing device comprises a third injection pipe, the third injection pipe is provided with a third inner port and a third outer port which are opposite in the inner and outer directions, the third outer port is used for being communicated with an air source, the third inner port is communicated with the second accommodating part, the third injection pipe is obliquely arranged, the third inner port is positioned above the third outer port, the fourth fluidizing device comprises a fourth injection pipe, the fourth injection pipe is provided with a fourth inner port and a fourth outer port which are opposite in the inner and outer directions, the fourth outer port is used for being communicated with the air source, the fourth inner port is communicated with the second accommodating part, the fourth injection pipe is obliquely arranged, and the fourth inner port is positioned above the fourth outer port.

5. The pulverized coal conveying system according to claim 4, characterized by further comprising:

the fifth injection pipe is arranged on the second section and provided with a fifth inner port and a fifth outer port which are opposite in the inner and outer directions, the fifth outer port is used for being communicated with an air source, the fifth inner port is communicated with the second accommodating part, the fifth injection pipe is obliquely arranged, and the fifth inner port is positioned above the fifth outer port; and

the sealing cover is detachably arranged on the fifth outer port and used for plugging the fifth outer port.

6. The pulverized coal conveying system according to claim 5, wherein the fifth injection pipe is provided in plurality, and a plurality of the first fluidizing devices, a plurality of the second fluidizing devices and a plurality of the fifth injection pipes are alternately arranged in sequence in the circumferential direction of the pulverized coal bunker.

7. The pulverized coal delivery system according to claim 6, further comprising:

the bin pump is provided with a bin pump inlet and a bin pump outlet, and the bin pump inlet is communicated with the pulverized coal outlet; and

the stokehole bin is provided with a stokehole bin inlet and a stokehole bin outlet, the stokehole bin inlet is communicated with the bin pump outlet, the stokehole bin outlet is used for allowing pulverized coal to flow out, and a powder bin cloth bag is arranged in the stokehole bin; and

and the pressure difference measuring device is arranged on the powder bin cloth bag to monitor the internal and external pressure difference of the powder bin cloth bag.

8. A method of using a pulverized coal conveying system, wherein the pulverized coal conveying system is the pulverized coal conveying system according to any one of claims 1 to 7, the method comprising the steps of:

when the pulverized coal conveying system works normally, the first fluidizing device and the second fluidizing device are started, so that pulverized coal in the second section is suspended in the second accommodating part.

9. The use method according to claim 8, wherein the pulverized coal conveying system is the pulverized coal conveying system according to claim 3, and when the pulverized coal conveying system is in normal operation, part of the first fluidizing device and part of the second fluidizing device are opened.

10. The use method according to claim 9, wherein the pulverized coal conveying system is the pulverized coal conveying system according to claim 5, and when the pulverized coal conveying system is in normal operation, part of the first fluidizing devices, part of the second fluidizing devices and all the fourth fluidizing devices are opened.

When the pulverized coal conveying system works abnormally, all the first fluidizing devices and all the second fluidizing devices are started firstly;

then, if the pulverized coal conveying system still works abnormally, all the third fluidizing devices are started;

and then, if the pulverized coal conveying system still works abnormally, the sealing cover is detached so as to blow the fluidizing gas into the second accommodating part through the fifth injection pipe.

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