CN215029538U - Powder process system of thermal power plant and online cleaning device of filter screen impurity thereof - Google Patents

Abstract

The utility model discloses a thermal power plant powder process system and filter screen impurity on-line cleaning device thereof, the cleaning device comprises a fixed filter screen, a first baffle, a second baffle, a sealing mechanism and a bypass pipe, wherein the fixed filter screen, the first baffle, the second baffle and the sealing mechanism are arranged aiming at a pulverized coal pipe, the bypass pipe is provided with a bypass baffle, and a differential pressure gauge for detecting the front and back differential pressure of the fixed filter screen is arranged on the pulverized coal pipe; the coal pulverizing system of the thermal power plant comprises a coal mill, a raw coal hopper, a coal feeder, a separator and a cleaning device. The utility model prevents the sundries generated by the powder process system from being blocked in the filter screen by arranging the fixed filter screen, avoids the adverse effect of the sundries on the equipment, reduces the start and stop of the coal mill, reduces the loss life of the equipment, increases the reliability of the equipment and reduces the possibility of explosion of the coal mill; meanwhile, through the arranged sealing mechanism and the arranged access hole, the operation amount of the operation personnel on the powder making system and the workload of arrangement safety measures are optimized and reduced, the workload of the maintenance personnel is also reduced, and the maintenance efficiency and the maintenance effect are improved.

Description

Powder process system of thermal power plant and online cleaning device of filter screen impurity thereof

Technical Field

The utility model relates to a thermal power factory powder process system coal pulverizer technical field, in particular to thermal power factory powder process system and the online cleaning device of filter screen impurity who clears up impurity.

Background

In the power generation production process of the modern thermal power plant, in order to improve the production efficiency and reduce the power generation cost, a double-inlet double-outlet positive pressure type coal pulverizing system is used, and the coal pulverizing system can be shown in the attached drawing 1, wherein the double-inlet double-outlet positive pressure type coal pulverizing system comprises a group of double-inlet double-outlet steel ball coal mills 2, two groups of raw coal hoppers 3, a coal feeder 4 and a separator 5, a coal powder pipe 6 is arranged between the double-inlet double-outlet steel ball coal mills 2 and the separator 5, and coal powder is blown to the separator 5 from the coal powder pipe 6 through positive pressure.

At the powder process system operation in-process, because the coal type has debris such as difficult plastics, iron wire that grind, after getting into the coal pulverizer, can not be by the grinding, blow to the boiler in-process by a wind, hang the rotatory separator region at the powder process system easily, the inventor is realizing the utility model discloses an in-process, discovery this kind of condition can cause following harm:

1. the rotating separation is jammed and trips;

2. too much sundries are easy to block the bypass pipe;

3. a large amount of impurities easily block the separator;

4. because the plastic sundries belong to inflammable goods, the separator is easy to cause temperature rise, fire ignition and even explosion;

5. the separator is provided with impurities, the flow resistance of the pulverized coal is increased, the output of the coal mill is influenced, and meanwhile, the power consumption of the coal mill and the primary fan is increased;

6. the separator is required to stop the coal mill for cleaning when hanging too much sundries, so that the workload of maintenance and operation personnel is increased, and meanwhile, the frequency of starting and stopping the coal mill is increased, and the service life of equipment is prolonged;

7. and the coal mill is started and stopped, so that the possible risk of explosion of the coal mill is increased.

In view of this, how to solve when current thermal power plant's powder process system moves, there is the rotation separator to carry debris easily, and debris are more, and is big to powder process system's power output, safety influence, if will clear up debris, must stop the operation coal pulverizer just can clear up, will arrange the safety measure again, has so both increased work load, increases the coal pulverizer again and opens and stop the possibility of explosion, and the dangerous scheduling problem of operating personnel and maintainer life, just becomes the utility model discloses the problem that the research was solved.

Disclosure of Invention

The utility model provides a powder process system of thermal power plant and online cleaning device of filter screen impurity thereof, thereby solve when current thermal power plant powder process system moves, there is rotatory separator to carry debris easily, debris are more, exert oneself to the powder process system, the safety influence is big, if will clear up debris, must stop the clearance of fortune coal pulverizer, arrange safety measure again, so both increase work load, it opens the danger scheduling problem that stops the possibility of explosion and operating personnel and maintainer life to increase the coal pulverizer again, can realize under the powder process system operational aspect, carry out the impurity clearance, it opens and stops the frequency to reduce the coal pulverizer, reduce the operation volume, make the staff safer again, do not influence the unit load again.

In order to achieve the purpose, the utility model provides an online cleaning device for impurities in a filter screen, which comprises a fixed filter screen, a first baffle, a second baffle, a sealing mechanism and a bypass baffle, wherein the fixed filter screen is arranged aiming at a pulverized coal pipe;

the first baffle, the fixed filter screen and the second baffle are sequentially arranged along the powder outlet direction of the pulverized coal pipe, and a differential pressure gauge for detecting the front-back differential pressure of the fixed filter screen is arranged on the pulverized coal pipe;

the sealing mechanism comprises a sealing air inlet main pipe, a first sealing air inlet branch pipe, a second sealing air inlet branch pipe and a sealing air pipe, wherein a third sealing air valve is arranged on the sealing air inlet main pipe;

and an access door is arranged on the side wall of the pulverized coal pipe between the first baffle and the fixed filter screen.

The utility model also provides a thermal power plant powder process system, in the above-mentioned technical scheme filter screen impurity online cleaning device, still include coal pulverizer, former coal scuttle, feeder and separator.

The related content of the utility model is explained as follows:

1. in the utility model, the fixed filter screen is arranged to block the sundries generated by the powder process system in the filter screen, thereby avoiding the adverse effect of the sundries on the equipment, reducing the start and stop of the coal mill, reducing the loss life of the equipment, increasing the reliability of the equipment and reducing the possibility of explosion of the coal mill; the output of the coal mill is increased, and the operation mode of the coal mill can be further optimized. Meanwhile, through the arranged sealing mechanism and the arranged access hole, the operation amount of the operation personnel on the powder making system and the workload of arrangement safety measures are optimized and reduced, the workload of the maintenance personnel is also reduced, and the maintenance efficiency and the maintenance effect are improved.

2. The utility model discloses in, first baffle, second baffle, bypass baffle adopt the electric close flapper door, realize by the electric close flapper door that each baffle of drive is to the closure of buggy pipe and bypass pipe, avoid artifically.

3. The utility model discloses in, first baffle, second baffle, bypass baffle adopt manual closing damper be provided with padlock mechanism on first baffle, second baffle, the bypass baffle, accessible manual operation's mode carries out closed operation to each baffle, adopts its cost of manual closing damper lower, the structure is simpler, and padlock mechanism increases the security in addition, and first baffle and second baffle shelter from the buggy pipe completely, and the bypass baffle shelters from the bypass pipe completely.

4. The utility model discloses in, dispose padlock mechanism on the first sealed air valve door, the sealed air valve door of second, the sealed air valve door of third, first sealed air valve door, the sealed air valve door of second, the sealed air valve door of third are by maintainer manual operation, increase padlock mechanism in order to increase the security.

5. The utility model discloses in, the mesh number of fixed filter screen is 30mm ~50mm, the mesh number of fixed filter screen adopts 30mm, adopts the fixed filter screen of this kind of scope mesh number, both can stop debris in the buggy pipe again, do not influence the passing through of most buggy again.

6. The utility model discloses in, the quantity in sealed wind gap is four, four sealed wind gap evenly must arrange in the circumference of buggy pipe.

7. In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, coupled between two elements, or coupled in any other manner that does not materially affect the operation of the device, unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

8. In the present invention, the terms "center", "upper", "lower", "axial", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional assembly relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

9. 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 application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Because of the application of above-mentioned scheme, compared with the prior art, the utility model have following advantage and effect:

1. the above scheme of the utility model blocks the sundries produced by the powder process system in the filter screen by setting the fixed filter screen, avoids the harmful effect of the sundries on the equipment, reduces the start and stop of the coal mill, reduces the loss life of the equipment, increases the reliability of the equipment, and reduces the possibility of explosion of the coal mill; the output of the coal mill is increased, and the running mode of the coal mill can be further optimized;

2. the utility model discloses an in the above-mentioned scheme through setting up access hole and the differential pressure table that corresponds with the filter screen, when fixed filter screen differential pressure is high to 300Pa, just send out alarm signal, it is too much to explain filter screen department impurity, need clear up, through opening the bypass baffle earlier, make the play powder of powder process system keep running, then close first baffle, second baffle, open the access hole again and clear up fixed filter screen, can no longer clear up the filter screen on line under the condition of powder process system, reduce the start-stop of coal pulverizer, reduce the equipment loss life-span, increase the reliability of equipment, reduce the possibility of coal pulverizer explosion;

3. the above technical scheme of the utility model the buggy pipe position department of first baffle and second baffle has again established sealing mechanism, has avoided a small amount of buggy to spill from the peripheral gap of first baffle and second baffle, makes it can not influence maintainer's cleaning work, consequently sets up sealing mechanism, can reduce the leakage of buggy, prevents the polluted environment.

Drawings

FIG. 1 is a schematic structural diagram of a pulverizing system of a conventional thermal power plant;

fig. 2 is a schematic structural diagram of a pulverizing system of a thermal power plant in an embodiment of the present invention;

FIG. 3 is a schematic view of an online cleaning device for impurities in a filter screen in an embodiment of the present invention;

fig. 4 is a schematic diagram of a sealing mechanism according to an embodiment of the present invention.

The drawings are shown in the following parts:

1. a cleaning device; 11. fixing the filter screen; 12. a first baffle plate; 13. a second baffle; 14. a sealing mechanism; 141. sealing the air inlet main pipe; 142. a first sealed air inlet branch pipe; 143. a second sealed air inlet branch pipe; 144. sealing the air pipe; 145. a first seal air valve; 146. a second seal air valve; 147. a third seal air valve; 148. sealing the air duct; 149. sealing the tuyere; 15. a bypass pipe; 16. a bypass baffle; 17. a differential pressure gauge; 171. a probe; 18. an access door; 2. a coal mill; 3. a raw coal hopper; 4. a coal feeder; 5. a separator; 6. a pulverized coal pipe.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

As shown in fig. 3, the embodiment of the present invention provides an online cleaning device for filter screen impurities, where the cleaning device 1 includes a fixed filter screen 11 disposed for a pulverized coal pipe 6, a first baffle 12, a second baffle 13, a sealing mechanism 14, a bypass pipe 15, and a bypass baffle 16 disposed for the bypass pipe 15; on the pulverized coal pipe 6, the front outlet of the bypass pipe 15 is positioned in front of the first baffle plate 12, and the rear outlet of the bypass pipe 15 is positioned behind the second baffle plate 13; the first baffle plate 12 and the second baffle plate 13 are used for selectively shielding the pulverized coal pipe 6, and the bypass baffle plate 16 is used for selectively shielding the bypass pipe 15; the first baffle plate 12, the fixed filter screen 11 and the second baffle plate 13 are sequentially arranged in the front and back direction of the pulverized coal pipe 6, and a differential pressure gauge 17 for detecting the front and back differential pressure of the fixed filter screen 11 is arranged on the pulverized coal pipe 6; the sealing mechanism 14 comprises a sealing air inlet manifold 141, a first sealing air inlet branch pipe 142, a second sealing air inlet branch pipe 143 and a sealing air pipe 144, a third sealing air valve 147 is arranged on the sealing air inlet manifold 141, a first sealing air valve 145 is arranged on the first sealing air inlet branch pipe 142, a second sealing air valve 146 is arranged on the second sealing air inlet branch pipe 143, the sealing air inlet manifold 141 is used for being connected with an external sealing fan, the sealing air inlet manifold 141 is connected with the first sealing air inlet branch pipe 142 and the second sealing air inlet branch pipe 143 which are connected in parallel, the sealing air pipe 144 is arranged outside a first baffle plate 12 and a second baffle plate 13 in the circumferential direction of the pulverized coal pipe 6, the sealing air pipe 144 outside the first baffle plate 12 is communicated with the first sealing air inlet branch pipe 142, the sealing air pipe 144 outside the second baffle plate 13 is communicated with the second sealing air inlet branch pipe 143, the sealing air pipe 144 is arranged around the circumferential direction of the pulverized coal pipe 6 and forms an annular sealing air duct 148, at least two sealing air ports 149 communicated with the sealing air channel 148 are arranged on the pulverized coal pipe 6; the coal powder pipe 6 is provided with an access door 18 on the side wall between the first baffle 12 and the fixed filter screen 11.

As shown in the attached drawing 2, the utility model also provides a powder process system of thermal power plant, including among the above-mentioned technical scheme filter screen impurity online cleaning device, still include coal pulverizer 2, raw coal fill 3, coal feeder 4 and separator 5.

The embodiment of the utility model provides a stop the debris that the powder process system produced in the filter screen through setting up fixed filter screen 11, avoid debris to carry out online clearance to impurity again under the circumstances of not shutting down, reduce coal pulverizer 2 and open and stop the frequency, reduce the operation volume, make the staff safer again, do not influence the unit load again.

The embodiment of the utility model provides a when implementing, thermal power plant powder process system has been in the running state all the time, first baffle 12 in the buggy pipe 6, second baffle 13 is in the open mode, bypass baffle 16 in the bypass pipe 15 is in the closed state, raw coal fill 3 and feeder 4 provide raw coal for coal pulverizer 2, the play powder route of the buggy that coal pulverizer 2 ground blows to separator 5 along the play powder direction of buggy pipe 6, the buggy has blown the boiler by separator 5 again, and the fixed filter screen 11 of buggy pipe 6 department carries out once filtration with the buggy that coal pulverizer 2 ground, the plastics that are difficult to grind, impurity such as iron wire is blockked by fixed filter screen 11, and tiny bit buggy then passes into separator 5 from the mesh of fixed filter screen 11, with this mesh that reaches filtering impurity.

In this online cleaning device's of thermal power plant powder process system and filter screen impurity operation, the impurity that fixed filter screen 11 blockked can be more and more to influence the filter effect, because this thermal power plant powder process system adopts the positive pressure formula, the existence differential pressure of the too much fixed filter screen 11 both sides of impurity, consequently is in the embodiment of the utility model provides an, install differential pressure meter 17 that is used for detecting differential pressure around fixed filter screen 11 on pulverized coal pipe 6, differential pressure meter 17 installs in pulverized coal pipe 6's the outside so that the staff observes, and the front end and the rear end of pulverized coal pipe 6 inside fixed filter screen 11 are arranged respectively in to two probes 171 of differential pressure meter 17. When the differential pressure gauge 17 detects that the differential pressure of the fixed filter screen 11 is up to 300Pa, an alarm signal is sent out, which indicates that the impurities at the fixed filter screen 11 are excessive and need to be cleaned. During the operation process, the bypass baffle 16 is opened, then the first baffle 12 and the second baffle 13 are closed, the first sealing air valve 145, the second sealing air valve 146 and the third sealing air valve 147 are opened, the access door 18 is opened slowly, and the fixed filter screen 11 is cleaned; after cleaning, the access door 18 is closed, the first baffle 12 and the second baffle 13 are opened, and the first sealing air valve 145, the second sealing air valve 146, the third sealing air valve 147 and the bypass baffle 16 are closed.

Because the adopted coal pulverizing system of the thermal power plant is in positive pressure type, when the first baffle plate 12 and the second baffle plate 13 are closed and the access hole is opened, a small amount of coal dust can easily leak from the peripheral gaps of the first baffle plate 12 and the second baffle plate 13 to influence the cleaning work of maintainers, and therefore, the sealing mechanism 14 is arranged, the leakage of the coal dust can be reduced, and the environment pollution is prevented. Referring to fig. 3 and fig. 4, the sealing air is sent to the sealing air duct 144 from the sealing air inlet main pipe 141, the first sealing air inlet branch pipe 142, the second sealing air inlet branch pipe 143, the sealing air duct 144 surrounds the pulverized coal pipe 6 to form an annular sealing air duct 148, then the 4-way sealing air opening 149 is led out to the pulverized coal pipe 6 from the annular sealing air duct 148, the sealing air blows into the pulverized coal pipe 6 to block pulverized coal in the pulverized coal pipe 6 from flowing to the gaps around the first baffle 12 and the second baffle 13, and thus the sealing effect is achieved.

The utility model discloses shutting logic is as follows:

1. the bypass damper 16 is not opened and does not allow the first damper 12, the second damper 13 to be closed;

2. the first baffle 12 is closed, the second baffle 13 is not closed, and the access door 18 cannot be opened;

3. the first baffle plate 12 and the second baffle plate 13 are not fully opened, and the bypass baffle plate 16 cannot be closed;

4. the access door 18 is not closed, and the first shutter 12 and the second shutter 13 cannot be opened.

With respect to the above embodiments, the changes that may be made by the present invention are described as follows:

1. in the above embodiment, the first baffle 12, the second baffle 13, and the bypass baffle 16 adopt the electric closing baffle door, and the electric closing baffle door realizes the closing of the driving baffles to the pulverized coal pipe 6 and the bypass pipe 15, but the utility model discloses not so limited, the first baffle 12, the second baffle 13, and the bypass baffle 16 also can adopt the manual closing baffle door, and when adopting the manual closing baffle door again, then the padlock mechanism is added to increase the safety. Similarly, the first sealing air valve 145, the second sealing air valve 146 and the third sealing air valve 147 can be closed manually.

2. In the above embodiment, the mesh number of the fixed filter screen 11 may be 30mm × 30mm, 40mm × 40mm or 50mm × 50mm, or may be 30mm × 40mm, 40mm × 50mm or 30mm × 50mm, and according to experiments and practical applications, the mesh number of 30mm × 30mm to 50mm may have a better filtering effect, and may further block impurities without affecting the passage of the pulverized coal.

3. In the above embodiment, the number of the sealing tuyere 149 is four, and four sealing tuyeres 149 are uniformly arranged in the circumferential direction of the pulverized coal pipe 6, but the present invention is not limited thereto, and the number of the sealing tuyere may also be six, eight, and the like.

It should be noted that the differential pressure gauge 17, the valve baffle, the connection relationship and the control relationship between the devices such as the coal mill 2, the raw coal hopper 3, the coal feeder 4 and the separator 5 and the power supply, and the pipeline arrangement in the pulverizing system of the thermal power plant are all in the prior art, and therefore, are not specifically described herein. Similarly, the padlock mechanism also belongs to the electromechanical field and is used for the safety device that each device that needs the switch locks when it closes, because do not belong to the utility model discloses an innovation place, also do not describe its specific structure here again.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. The utility model provides an online cleaning device of filter screen impurity which characterized in that: the cleaning device (1) comprises a fixed filter screen (11), a first baffle plate (12), a second baffle plate (13), a sealing mechanism (14) and a bypass pipe (15) arranged on one side of the pulverized coal pipe (6), wherein the fixed filter screen (11), the first baffle plate (12), the second baffle plate (13), the sealing mechanism (14) and the bypass pipe (15) are arranged on one side of the pulverized coal pipe (6), a bypass baffle plate (16) is arranged in the bypass pipe (15), the first baffle plate (12) and the second baffle plate (13) are used for selectively shielding the pulverized coal pipe (6), and the bypass baffle plate (16) is used for selectively shielding the bypass pipe (15);

the first baffle (12), the fixed filter screen (11) and the second baffle (13) are sequentially arranged in the front and back direction of the pulverized coal outlet direction of the pulverized coal pipe (6), and a differential pressure gauge (17) for detecting the front and back differential pressure of the fixed filter screen (11) is arranged on the pulverized coal pipe (6);

the sealing mechanism (14) comprises a sealing air inlet main pipe (141), a first sealing air inlet branch pipe (142), a second sealing air inlet branch pipe (143) and a sealing air pipe (144), the sealing air inlet main pipe (141) is connected with the first sealing air inlet branch pipe (142) and the second sealing air inlet branch pipe (143) in parallel, a third sealing air valve (147) is arranged on the sealing air inlet main pipe (141), a first sealing air valve (145) is arranged on the first sealing air inlet branch pipe (142), a second sealing air valve (146) is arranged on the second sealing air inlet branch pipe (143), and the sealing air inlet main pipe (141) is used for being connected with an external sealing fan; the sealing air pipes (144) are arranged at the outer sides of a first baffle (12) and a second baffle (13) on the circumferential direction of the pulverized coal pipe (6), the sealing air pipes (144) at the outer side of the first baffle (12) are communicated with a first sealing air inlet branch pipe (142), the sealing air pipes (144) at the outer side of the second baffle (13) are communicated with a second sealing air inlet branch pipe (143), the sealing air pipes (144) are arranged around the circumferential direction of the pulverized coal pipe (6) and form an annular sealing air duct (148), and at least two sealing air openings (149) communicated with the sealing air duct (148) are arranged on the pulverized coal pipe (6);

an access door (18) is arranged on the side wall of the pulverized coal pipe (6) between the first baffle plate (12) and the fixed filter screen (11).

2. The filter screen impurity on-line cleaning device of claim 1, characterized in that: the first baffle (12), the second baffle (13) and the bypass baffle (16) adopt an electric closing baffle door.

3. The filter screen impurity on-line cleaning device of claim 1, characterized in that: the first baffle (12), the second baffle (13) and the bypass baffle (16) adopt manual closing baffle doors, and padlock mechanisms are arranged on the first baffle (12), the second baffle (13) and the bypass baffle (16).

4. The filter screen impurity on-line cleaning device of claim 1, characterized in that: and padlock mechanisms are arranged on the first sealing air valve (145), the second sealing air valve (146) and the third sealing air valve (147).

5. The filter screen impurity on-line cleaning device of claim 1, characterized in that: the mesh number of the fixed filter screen (11) is 30 mm-50 mm.

6. The online cleaning device of filter screen impurity of claim 5, characterized in that: the mesh number of the fixed filter screen (11) is 30mm by 30 mm.

7. The filter screen impurity on-line cleaning device of claim 1, characterized in that: the number of the sealing tuyeres (149) is four, and the four sealing tuyeres (149) are uniformly distributed on the circumferential direction of the pulverized coal pipe (6).

8. The filter screen impurity on-line cleaning device of claim 1, characterized in that: the differential pressure gauge (17) is arranged on the outer side of the pulverized coal pipe (6), and two probes (171) of the differential pressure gauge (17) are respectively arranged at the front end and the rear end of the fixed filter screen (11) in the pulverized coal pipe (6).

9. The utility model provides a thermal power plant powder process system which characterized in that: the thermal power plant pulverizing system comprises the filter screen impurity online cleaning device of any one of claims 1 to 8.

10. The thermal power plant pulverizing system of claim 9, wherein: the coal pulverizing system of the thermal power plant further comprises a coal mill (2), a raw coal hopper (3), a coal feeder (4) and a separator (5).

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