Coal feeding equipment and raw coal sampling device for coal-fired power plant

Abstract

The utility model provides coal-fired power plant coal feeding equipment and a raw coal sampling device, the coal-fired power plant coal feeding equipment comprises a coal feeder, a raw coal bunker, a coal discharging pipe, a sampling pipe seat and a sampler, the raw coal bunker is communicated with the coal feeder through the coal discharging pipe; the sampling pipe seat is provided with a sampling pipe cavity, the head end of the sampling pipe seat is arranged on the side wall of the coal discharging pipe, and the head end of the sampling pipe cavity is communicated with the coal discharging pipe; the sampling tube seat is provided with a compressed air inlet and a first valve, the compressed air inlet and the first valve are sequentially distributed in the direction from the head end of the sampling tube seat to the tail end of the sampling tube seat, and the compressed air inlet is directly or indirectly communicated with the sampling tube cavity; the sampler is detachably matched with the sampling pipe seat, and when the first valve is opened, the sampler can extend into the sampling pipe cavity through the tail end of the sampling pipe seat and extend into the coal discharging pipe, so that the technical problems that raw coal is easy to splash and the sampling pipe is easy to block in the raw coal sampling process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired power generation equipment, in particular to coal feeding equipment and a raw coal sampling device for a coal-fired power plant. Background Art

[0002] Thermal power plants use coal combustion to generate electricity. The performance of the coal entering the furnace is a routine supervision item, and coal samples need to be collected regularly for monitoring. Raw coal sampling is also an important link when conducting boiler thermal efficiency tests and coal mill related performance tests. Accurate sampling can provide real coal quality data for subsequent performance index calculations.

[0003] At present, there are two main locations for raw coal sampling: the upper coal belt and the coal feeder. The best location for raw coal sampling is at the lower coal pipe of the coal feeder.

[0004] When sampling raw coal from the coal pipe, an iron pipe welded to the coal pipe is usually used, and the outlet of the iron pipe is only blocked with a cap or a plug. When raw coal sampling is required, the plug is opened, and the raw coal flows out through the iron pipe for coal sampling. During the sampling process, the raw coal is prone to splashing, and the iron pipe is prone to being blocked by large particles of raw coal. Utility Model Content

[0005] The utility model aims to provide a coal feeding device and a raw coal sampling device for a coal-fired power plant, so as to solve the technical problems that raw coal is easy to splash and a sampling tube is easy to be blocked during the raw coal sampling process.

[0006] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] The utility model provides a coal feeding device for a coal-fired power plant, comprising: a coal feeder, a raw coal bin, a lower coal pipe, a sampling tube seat and a sampler, wherein the raw coal bin is connected with the coal feeder through the lower coal pipe; the sampling tube seat has a sampling tube cavity, the head end of the sampling tube seat is arranged on the side wall of the lower coal pipe, and the head end of the sampling tube cavity is connected with the lower coal pipe; the sampling tube seat is provided with a compressed air inlet and a first valve, the compressed air inlet and the first valve are sequentially distributed along the direction from the head end of the sampling tube seat to the tail end of the sampling tube seat, and the compressed air inlet is directly or indirectly connected with the sampling tube cavity; the sampler is detachably matched with the sampling tube seat, and when the first valve is opened, the sampler can extend into the sampling tube cavity and into the lower coal pipe through the tail end of the sampling tube seat.

[0008] In a preferred embodiment, the sampling tube seat includes a sealed tube seat, the head end of the sealed tube seat is connected to the lower coal pipe, and the first valve is connected to the tail end of the sealed tube seat; the compressed air inlet is arranged on the sealed tube seat, and the tube wall of the sealed tube seat is provided with an annular input channel, and the annular input channel is inclined inwardly along the direction from the tail end of the sampling tube seat to the head end of the sampling tube seat; the inner end of the annular input channel is connected to the sampling tube cavity, and the compressed air inlet is connected to the annular input channel.

[0009] In a preferred embodiment, the tube wall of the sealing tube seat is provided with an annular guide cavity, the annular guide cavity is extended along the longitudinal direction of the sealing tube seat, and the compressed air inlet, the annular guide cavity and the annular input channel are connected in sequence.

[0010] In a preferred embodiment, the sealing pipe seat includes a first pipe body and a second pipe body, the head end of the first pipe body is connected to the lower coal pipe, a groove portion is provided on the inner side of the first pipe body, and the second pipe body includes a protrusion portion, which extends into the groove portion, and the annular guide cavity and the annular input channel are constructed between the outer wall of the protrusion portion and the inner wall of the groove portion.

[0011] In a preferred embodiment, the compressed air inlet is provided with a second valve.

[0012] In a preferred embodiment, a first sealing gasket is arranged between the end face of the first valve and the end face of the sealing tube seat, the outer diameter of the sampler is smaller than the inner diameter of the first valve, the outer diameter of the sampler is smaller than the inner diameter of the sealing tube seat, and the outer diameter of the sampler is larger than the inner diameter of the first sealing gasket.

[0013] In a preferred embodiment, the sampling tube holder includes an extension tube and a plugging plate, the plugging plate is provided with an opening for the sampler to extend into, the extension tube and the plugging plate are distributed in a direction from the head end of the sampling tube holder to the tail end of the sampling tube holder and are fixed to the tail end of the first valve.

[0014] In a preferred embodiment, a second sealing gasket is arranged between the end face of the first valve and the end face of the extension tube, a third sealing gasket is arranged between the end face of the blocking plate and the end face of the extension tube, the outer diameter of the sampler is smaller than the inner diameter of the extension tube, the outer diameter of the sampler is smaller than the inner diameter of the opening of the blocking plate, the outer diameter of the sampler is larger than the inner diameter of the second sealing gasket, and the outer diameter of the sampler is larger than the inner diameter of the third sealing gasket.

[0015] In a preferred embodiment, the sampler includes a hollow tube, a tail plug and a handle, the head end of the hollow tube is provided with a sampling port, the tail plug is provided at the tail end of the hollow tube, and the handle is provided at the tail plug.

[0016] In a preferred embodiment, the head end of the sampling tube holder points to the direction of the tail end of the sampling tube holder and is tilted in a direction from top to bottom.

[0017] The utility model provides a raw coal sampling device, which is applied to the above-mentioned coal feeding equipment of the coal-fired power plant. The raw coal sampling device comprises: a sampling tube seat and a sampler. The sampling tube seat has a sampling tube cavity. The head end of the sampling tube seat is used to be arranged on the side wall of the lower coal pipe, and the head end of the sampling tube cavity is used to communicate with the lower coal pipe; the sampling tube seat is provided with a compressed air inlet and a first valve, and the compressed air inlet and the first valve are sequentially distributed along the direction from the head end of the sampling tube seat to the tail end of the sampling tube seat, and the compressed air inlet is directly or indirectly connected with the sampling tube cavity; the sampler is detachably matched with the sampling tube seat, and when the first valve is opened, the sampler can extend into the sampling tube cavity through the tail end of the sampling tube seat and can extend into the lower coal pipe.

[0018] The characteristics and advantages of this utility model are:

[0019] The raw coal bin, the coal lowering pipe and the coal feeder are used to supply raw coal, and the sampling tube holder and the sampler cooperate to complete the raw coal sampling. When not sampling, the first valve is closed to seal the sampling tube cavity of the sampling tube holder. When sampling, the first valve is opened, the sampler is inserted into the coal lowering pipe, and compressed air is introduced into the sampling tube cavity through the compressed air inlet. The compressed air flows from the sampling tube cavity to the coal lowering pipe, which can ensure that the raw coal in the coal lowering pipe and the sealing wind of the coal feeder will not splash out through the sampling tube cavity. The raw coal in the coal lowering pipe falls into the sampler, and after the sampler is pulled out of the sampling tube holder, the sampler takes out the raw coal, thus realizing the raw coal sampling. Since the sampling tube holder is arranged at the coal lowering pipe, the collected raw coal sample is always in a flowing state, which is more representative.

[0020] When the coal-fired power plant's coal feeding equipment takes samples, it can avoid splashing of raw coal and prevent raw coal from entering the sampling tube cavity. The collected raw coal samples are taken out through the sampler to avoid clogging of the sampling tube cavity, thus solving the technical problems of raw coal being easily splashed and the sampling tube being easily blocked during the raw coal sampling process. In addition, the collected raw coal samples are more representative, thereby improving the accuracy of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a sampling tube holder in a raw coal sampling device provided by the utility model;

[0023] Figure 2 A schematic diagram of the structure of a sampler in the raw coal sampling device provided by the utility model;

[0024] Figure 3 The utility model is a schematic structural diagram of the coal feeding equipment of a coal-fired power plant.

[0025] Description of Figure Numbers:

[0026] 11. Coal feeder; 12. Raw coal bunker; 13. Coal discharge pipe;

[0027] 20. sampling tube holder; 21. sampling tube cavity; 22. the head end of the sampling tube holder points to the direction of the tail end of the sampling tube holder;

[0028] 30. Compressed air inlet;

[0029] 40. Sealing tube seat; 41. First tube body; 411. Groove portion; 42. Second tube body; 421. Protrusion; 43. Annular input channel; 44. Annular flow guide cavity;

[0030] 50. First valve; 51. Ball valve handle;

[0031] 61. Extension pipe; 62. Blocking plate;

[0032] 71. a first sealing gasket; 72. a second sealing gasket; 73. a third sealing gasket;

[0033] 80. Sampler; 81. Hollow tube; 811. Sampling port; 82. Tail plug; 83. Handle. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Solution 1

[0036] The utility model provides a coal feeding device for a coal-fired power plant, such as Figure 1-Figure 3 As shown, it includes: a coal feeder 11, a raw coal bin 12, a lower coal pipe 13, a sampling tube holder 20 and a sampler 80. The raw coal bin 12 is connected to the coal feeder 11 through the lower coal pipe 13; the sampling tube holder 20 has a sampling tube cavity 21, the head end of the sampling tube holder 20 is arranged on the side wall of the lower coal pipe 13, and the head end of the sampling tube cavity 21 is connected to the lower coal pipe 13; the sampling tube holder 20 is provided with a compressed air inlet 30 and a first valve 50, the compressed air inlet 30 and the first valve 50 are sequentially distributed along the direction 22 from the head end of the sampling tube holder to the tail end of the sampling tube holder, and the compressed air inlet 30 is directly or indirectly connected to the sampling tube cavity 21; the sampler 80 is detachably matched with the sampling tube holder 20, and when the first valve 50 is opened, the sampler 80 can extend into the sampling tube cavity 21 through the tail end of the sampling tube holder 20 and extend into the lower coal pipe 13.

[0037] The raw coal bin 12, the lower coal pipe 13 and the coal feeder 11 are used to supply raw coal, and the sampling tube holder 20 and the sampler 80 cooperate to complete the raw coal sampling. When not sampling, the first valve 50 is closed to seal the sampling tube cavity 21 of the sampling tube holder 20. When sampling, the first valve 50 is opened, the sampler 80 extends into the lower coal pipe 13, and compressed air is introduced into the sampling tube cavity 21 through the compressed air inlet 30. The compressed air flows from the sampling tube cavity 21 to the lower coal pipe 13, which can ensure that the raw coal in the lower coal pipe 13 and the sealing wind of the coal feeder 11 will not splash out through the sampling tube cavity 21. The raw coal in the lower coal pipe 13 falls into the sampler 80. After the sampler 80 is pulled out from the sampling tube holder 20, the sampler 80 takes the raw coal out, that is, the raw coal sampling is realized. Since the sampling tube holder 20 is arranged at the lower coal pipe 13, the collected raw coal sample is always in a flowing state and is more representative.

[0038] When the coal-fired power plant uses the coal feeding equipment to take samples, it can avoid splashing of raw coal and prevent raw coal from entering the sampling tube cavity 21. The collected raw coal samples are taken out through the sampler 80 to avoid clogging of the sampling tube cavity 21, thereby solving the technical problems of raw coal being easily splashed and the sampling tube being easily blocked during the raw coal sampling process; moreover, the collected raw coal samples are more representative, thereby improving the accuracy of sampling.

[0039] In one embodiment, the sampling tube seat 20 includes a sealing tube seat 40, the head end of the sealing tube seat 40 is connected to the lower coal pipe 13, and the first valve 50 is connected to the tail end of the sealing tube seat 40; the compressed air inlet 30 is arranged on the sealing tube seat 40, and the tube wall of the sealing tube seat 40 is provided with an annular input channel 43, and the annular input channel 43 is inclined inwardly along the direction from the tail end of the sampling tube seat 20 to the head end of the sampling tube seat 20; the inner end of the annular input channel 43 is connected to the sampling tube cavity 21, and the compressed air inlet 30 is connected to the annular input channel 43. Figure 1 As shown, the annular input channel 43 is distributed around the sampling tube cavity 21. The compressed air flows into the sampling tube cavity 21 from the outside to the inside through the annular input channel 43, and along the direction from the tail end of the sampling tube holder 20 to the head end of the sampling tube holder 20, and then flows to the lower coal pipe 13, which can better prevent the raw coal and sealing wind in the lower coal pipe 13 from entering the sampling tube cavity 21, thereby preventing the raw coal from splashing.

[0040] Furthermore, the tube wall of the sealed tube seat 40 is provided with an annular flow guiding cavity 44, which is extended along the longitudinal direction of the sealed tube seat 40, and the compressed air inlet 30, the annular flow guiding cavity 44 and the annular input channel 43 are sequentially connected. The compressed air inputted from the compressed air inlet 30 first enters the annular flow guiding cavity 44, and the compressed air fills the annular flow guiding cavity 44, so that the compressed air surrounds the sampling tube cavity 21, and then flows into the annular input channel 43. The annular flow guiding cavity 44 plays the role of guiding and buffering, which is conducive to the compressed air flowing into the sampling tube cavity 21 evenly through the annular input channel 43, and improves the anti-splashing effect.

[0041] In one embodiment, the sealing pipe seat 40 includes a first pipe body 41 and a second pipe body 42. The first end of the first pipe body 41 is connected to the lower coal pipe 13. Figure 1 As shown, a groove portion 411 is provided on the inner side of the first tube body 41, and the second tube body 42 includes a protrusion 421, which extends into the groove portion 411, and an annular guide cavity 44 and an annular input channel 43 are constructed between the outer wall of the protrusion 421 and the inner wall of the groove portion 411. The first tube body 41 and the second tube body 42 can be formed separately and then assembled together, which reduces the processing difficulty of the annular guide cavity 44 and the annular input channel 43.

[0042] Preferably, the compressed air inlet 30 is provided with a second valve (not shown in the figure), and the amount and pressure of compressed air entering the sealed tube cavity can be controlled by the second valve, so as to maintain balance with the air pressure in the lower coal pipe 13, thereby ensuring that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not splash or leak through the sampling tube cavity 21.

[0043] In one embodiment, a first sealing gasket 71 is provided between the end surface of the first valve 50 and the end surface of the sealing tube seat 40, the outer diameter of the sampler 80 is smaller than the inner diameter of the first valve 50, the outer diameter of the sampler 80 is smaller than the inner diameter of the sealing tube seat 40, and the outer diameter of the sampler 80 is larger than the inner diameter of the first sealing gasket 71. After the sampler 80 is inserted into the sampling tube seat 20, the sampler 80 is clearance-matched with the sealing tube seat 40 and the first valve 50, which facilitates the sampler 80 to enter and exit the sampling tube seat 20; the sampler 80 and the first sealing gasket 71 are interference-fitted, which improves the sealing effect and ensures that when the sampler 80 enters and exits the sampling tube seat 20, the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak; at the same time, since the thickness of the first sealing gasket 71 is relatively thin, the influence on the sampler 80 entering and exiting the sampling tube seat 20 is relatively small.

[0044] In one embodiment, the sampling tube holder 20 includes an extension tube 61 and a plugging plate 62, and the plugging plate 62 is provided with an opening for the sampler 80 to extend into. The extension tube 61 and the plugging plate 62 are distributed along the direction 22 from the head end of the sampling tube holder to the tail end of the sampling tube holder and are fixed to the tail end of the first valve 50, which is conducive to the sampler 80 being smoothly inserted into the sampling tube holder 20 and taken out smoothly, so as to take out the raw coal sample.

[0045] Furthermore, a second sealing gasket 72 is arranged between the end face of the first valve 50 and the end face of the extension tube 61, a third sealing gasket 73 is arranged between the end face of the blocking plate 62 and the end face of the extension tube 61, the outer diameter of the sampler 80 is smaller than the inner diameter of the extension tube 61, the outer diameter of the sampler 80 is smaller than the inner diameter of the opening of the blocking plate 62, the outer diameter of the sampler 80 is larger than the inner diameter of the second sealing gasket 72, and the outer diameter of the sampler 80 is larger than the inner diameter of the third sealing gasket 73. After the sampler 80 is inserted into the sampling tube holder 20, the sampler 80 is respectively fitted with the gap between the blocking plate 62 and the extension tube 61, so as to facilitate the sampler 80 to enter and exit the sampling tube holder 20; the sampler 80 is interference fit with the second sealing gasket 72, and the sampler 80 is interference fit with the third sealing gasket 73, so as to improve the sealing effect and ensure that when the sampler 80 enters and exits the sampling tube holder 20, the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak; at the same time, since the thickness of the second sealing gasket 72 and the third sealing gasket 73 are relatively thin, the influence on the sampler 80 entering and exiting the sampling tube holder 20 is relatively small.

[0046] In one embodiment, the first valve 50 adopts a ball valve, specifically a large-flux ball valve with a nominal size of DN100 and an inner diameter of 100 mm. The ball valve can be opened or closed by a ball valve handle 51. The ball valve and the sealing tube seat 40 can be bolted, and the inner diameter of the sealing tube seat 40 can be 100 mm. The extension tube 61 is a hollow iron tube with an inner diameter of 100 mm; the extension tube 61 and the first valve 50 can be bolted. The plugging plate 62 is an iron plate with a hole in the middle, and the diameter of the opening of the plugging plate 62 can be 100 mm; the plugging plate 62 and the extension tube 61 can be bolted. Through the first sealing gasket 71, the second sealing gasket 72 and the third sealing gasket 73, it is ensured that each part is tightly connected and leak-free. The total length of the sampling tube seat 20 can be 500 mm, and the inner diameter of the sampling tube seat 20 can be 100 mm. The sealing pipe seat 40 is disposed on the side wall of the lower coal pipe 13, and the sealing pipe seat 40 is connected to the lower coal pipe 13; there is no gap at the connection between the sealing pipe seat 40 and the lower coal pipe 13 to prevent the raw coal from leaking out from the connection. The sealing pipe seat 40 can be welded, riveted or threadedly connected to the lower coal pipe 13.

[0047] The length of the sampler 80 is greater than the length of the sampling tube holder 20, so that the sampler 80 can be inserted into the lower coal pipe 13 for sampling. Raw coal sampling is mainly completed by the sampler 80. In one embodiment, the sampler 80 includes a hollow tube 81, a tail plug 82 and a handle 83. The head end of the hollow tube 81 is provided with a sampling port 811, the tail plug 82 is provided at the tail end of the hollow tube 81, and the handle 83 is provided at the tail plug 82. The hollow tube 81 is used to take raw coal samples from the lower coal pipe 13 through the sampling tube holder 20. When in use, the sampler 80 is placed in the sampling tube holder 20, the first valve 50 is opened, and the sampler 80 is inserted into the lower coal pipe 13. The hollow tube 81 of the sampler 80 can hold a certain amount of raw coal, and then the sampler 80 is taken out, so that the raw coal sample can be easily obtained.

[0048] The hollow tube 81 is used as a sampling iron tube, and the hollow tube 81 can be a hollow iron tube with an outer diameter of 95 mm. The particle size of the raw coal entering the furnace is generally 35 mm, and the inner diameter of the hollow tube 81 is 90 mm, which can ensure the representativeness of the raw coal sampling. The tail plug 82 is threadedly connected to the hollow tube 81, and the outer diameter of the tail plug 82 is 95 mm, which is consistent with the outer diameter of the hollow tube 81. The tail plug 82 can be opened to facilitate the cleaning of the raw coal remaining in the hollow tube 81. The handle 83 is welded to the tail plug 82 to facilitate the grip of the sampler 80. The outer diameter of the hollow tube 81 is the outer diameter of the sampler 80, and the inner diameters of the first sealing gasket 71, the second sealing gasket 72 and the third sealing gasket 73 are slightly smaller than the outer diameter of the hollow tube 81, thereby forming an interference fit.

[0049] The sampling tube holder 20 mainly plays a sealing role to ensure that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak during sampling. Figure 3As shown, the head end of the sampling tube holder points to the direction 22 of the tail end of the sampling tube holder, and is tilted from top to bottom, so that after the sampler 80 is inserted into the sampling tube holder 20, the raw coal in the lower coal pipe 13 can smoothly enter the sampler 80.

[0050] Further, the sampling port 811 provided at the head end of the hollow tube 81 is an inclined opening. The inclination angle of the direction 22 from the head end of the sampling tube holder to the tail end of the sampling tube holder relative to the horizontal plane may be equal to or different from the inclined angle of the inclined opening of the hollow tube 81. Preferably, the two are equal and both are 45°.

[0051] The structure and working mode of the raw coal bunker 12, the coal lowering pipe 13 and the coal feeder 11 can adopt the existing technology, which will not be described in detail here.

[0052] Solution 2

[0053] The utility model provides a raw coal sampling device, which is applied to the above-mentioned coal feeding equipment of the coal-fired power plant. The raw coal sampling device comprises: a sampling tube seat 20 and a sampler 80. The sampling tube seat 20 has a sampling tube cavity 21. The head end of the sampling tube seat 20 is used to be arranged on the side wall of the lower coal pipe 13, and the head end of the sampling tube cavity 21 is used to communicate with the lower coal pipe 13; the sampling tube seat 20 is provided with a compressed air inlet 30 and a first valve 50. The compressed air inlet 30 and the first valve 50 are sequentially distributed along the direction 22 from the head end of the sampling tube seat to the tail end of the sampling tube seat, and the compressed air inlet 30 is directly or indirectly connected with the sampling tube cavity 21; the sampler 80 is detachably matched with the sampling tube seat 20. When the first valve 50 is opened, the sampler 80 can extend into the sampling tube cavity 21 through the tail end of the sampling tube seat 20 and can extend into the lower coal pipe 13.

[0054] The structure and working mode of the sampling tube holder 20 and the sampler 80 in the raw coal sampling device have been introduced in the previous text, and have the aforementioned characteristics and beneficial effects, which will not be repeated here. The raw coal sampling device can be used as a raw coal sampling device for a coal feeder in a coal-fired power plant, solving the technical problems of raw coal splashing and easy clogging of the sampling tube during raw coal sampling.

[0055] The raw coal sampling device provided by the utility model aims at the situation that the raw coal sampling of the coal feeder is prone to splashing and clogging, and its advantages include: (1) the sampling tube seat 20 can be fixed on the lower coal pipe 13, and a sealing tube seat 40 is designed in the sampling tube seat 20. The sealing tube seat 40 that allows compressed air to pass through ensures that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak; (2) the interference fit between each sealing gasket and the sampler 80 is also conducive to ensuring that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak, and it is convenient to operate; (3) the first valve 50 adopts a large-flux ball valve to ensure the timeliness and convenience of the switching of the sampling device; (4) the outer wall of the sampler 80 is smooth, and a slanted opening with a 45° slant angle is provided to facilitate sampling.

[0056] The raw coal sampling device provided by the utility model can be used in a first method, including:

[0057] (1) Open the second valve of the compressed air inlet 30 on the sampling tube holder 20. The pressure of the compressed air is higher than the pressure of the sealing air of the coal feeder 11, and the compressed air flows into the lower coal pipe 13. Adjust the opening of the second valve. When the compressed air reaches a certain flow rate, it can be ensured that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak.

[0058] (2) Insert the sampler 80 from one end of the sampling tube holder 20, and insert the sampler 80 into the sampling tube holder 20 as much as possible. Because the sampler 80 and the sampling tube holder 20 are clearance-matched, the sampler 80 can be easily inserted into the sampling tube holder 20;

[0059] (3) Turning the ball valve handle 51 of the first valve 50 to open the first valve 50, so that the lower coal pipe 13 is connected to the sampler 80;

[0060] (4) Grasp the handle 83 of the sampler 80 and insert the sampler 80 into the lower coal pipe 13 through the sampling tube seat 20; insert the sampler 80 repeatedly several times so that the raw coal in the lower coal pipe 13 enters the sampler 80 from the head end. During this process, compressed air is supplied to the lower coal pipe 13 through the sealing tube seat 40, which can ensure that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak; the sampler 80 and each sealing gasket are interference fit, and the three-layer sealing gasket plays a sealing role, which can also ensure that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak;

[0061] (5) Slowly pull the sampler 80 out of the sampling tube holder 20. When the end face of the sampler 80 leaves the first valve 50 but does not leave the extension tube 61, the third sealing gasket 73 between the plugging plate 62 and the extension tube 61 still plays a sealing role to ensure that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak. Then close the first valve 50 to isolate the lower coal pipe 13 from the outside. Then completely pull the sampler 80 out of the sampling tube holder 20 and invert it, so as to pour the raw coal in the sampler 80 into the sampling bag.

[0062] (6) If there is residual raw coal in the sampler 80, the sampler 80 can be knocked with a hammer or the tail plug 82 can be opened to clean the sampler 80;

[0063] (7) If the sampling volume is not enough, repeat the above steps until the raw coal sampling volume is sufficient;

[0064] (8) After sampling is completed, the second valve of the compressed air inlet 30 is closed.

[0065] The raw coal sampling device provided by the utility model can adopt the second use method. When there is no compressed air or the sealing pipe seat 40 fails and cannot play a sealing role, the sampling device can still be used normally. The second use method includes:

[0066] (1) Insert the sampler 80 from one end of the sampling tube holder 20, and insert the sampler 80 into the sampling tube holder 20 as much as possible. Because the sampler 80 and the sampling tube holder 20 are clearance-matched, the sampler 80 can be easily inserted into the sampling tube holder 20;

[0067] (2) Turn the ball valve handle 51 of the first valve 50 to open the first valve 50, so that the lower coal pipe 13 is connected to the sampler 80; the sampler 80 and the sealing gaskets are interference fit, and the third sealing gasket 73 between the plugging plate 62 and the extension pipe 61 plays a sealing role, ensuring that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak;

[0068] (3) Grasp the handle 83 of the sampler 80 and insert the sampler 80 into the lower coal pipe 13 through the sampling tube holder 20; insert the sampler 80 repeatedly several times so that the raw coal in the lower coal pipe 13 enters the sampler 80 from the head end of the sampler 80. During this process, the sampler 80 and each sealing gasket are interference fit, and the three-layer sealing gasket plays a sealing role, which can ensure that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak;

[0069] (4) Slowly pull the sampler 80 out of the sampling tube holder 20. When the end face of the sampler 80 leaves the first valve 50 but does not leave the extension tube 61, the third sealing gasket 73 between the plugging plate 62 and the extension tube 61 still plays a sealing role to ensure that the raw coal in the lower coal pipe 13 and the sealing air of the coal feeder 11 will not leak. Then close the first valve 50 to isolate the lower coal pipe 13 from the outside. Then completely pull the sampler 80 out of the sampling tube holder 20 and invert it, so as to pour the raw coal in the sampler 80 into the sampling bag.

[0070] (5) If there is residual raw coal in the sampler 80, the sampler 80 can be knocked with a hammer or the tail plug 82 can be opened to clean the sampler 80;

[0071] (6) If the sampling volume is not enough at one time, the above operation can be repeated until the raw coal sampling volume is sufficient.

[0072] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A coal feeding device for a coal-fired power plant, characterized in that: include: A coal feeder, a raw coal bin, a coal lowering pipe, a sampling tube holder and a sampler, wherein the raw coal bin is connected to the coal feeder through the coal lowering pipe; the sampling tube holder has a sampling tube cavity, the head end of the sampling tube holder is arranged on the side wall of the coal lowering pipe, and the head end of the sampling tube cavity is connected to the coal lowering pipe; the sampling tube holder is provided with a compressed air inlet and a first valve, the compressed air inlet and the first valve are sequentially distributed along the direction from the head end of the sampling tube holder to the tail end of the sampling tube holder, and the compressed air inlet is directly or indirectly connected to the sampling tube cavity; the sampler is detachably matched with the sampling tube holder, and when the first valve is opened, the sampler can extend into the sampling tube cavity and into the coal lowering pipe through the tail end of the sampling tube holder.

2. The coal feeding equipment for a coal-fired power plant according to claim 1, characterized in that: The sampling tube seat comprises a sealing tube seat, the head end of the sealing tube seat is connected to the lower coal pipe, and the first valve is connected to the tail end of the sealing tube seat; The compressed air inlet is arranged on the sealed tube seat, and the tube wall of the sealed tube seat is provided with an annular input channel, and the annular input channel is inclined inwardly along the direction from the tail end of the sampling tube seat to the head end of the sampling tube seat; the inner end of the annular input channel is connected to the sampling tube cavity, and the compressed air inlet is connected to the annular input channel.

3. The coal feeding equipment for a coal-fired power plant according to claim 2, characterized in that: The tube wall of the sealing tube seat is provided with an annular flow guide cavity, and the annular flow guide cavity is extended along the longitudinal direction of the sealing tube seat. The compressed air inlet, the annular flow guide cavity and the annular input channel are connected in sequence.

4. The coal feeding equipment for a coal-fired power plant according to claim 3, characterized in that: The sealing pipe seat includes a first pipe body and a second pipe body, the head end of the first pipe body is connected to the lower coal pipe, a groove portion is provided on the inner side of the first pipe body, and the second pipe body includes a protrusion portion, which extends into the groove portion, and the annular guide cavity and the annular input channel are constructed between the outer wall of the protrusion portion and the inner wall of the groove portion.

5. The coal feeding equipment for a coal-fired power plant according to claim 3, characterized in that: The compressed air inlet is provided with a second valve.

6. The coal feeding equipment for a coal-fired power plant according to claim 2, characterized in that: A first sealing gasket is arranged between the end face of the first valve and the end face of the sealing tube seat, the outer diameter of the sampler is smaller than the inner diameter of the first valve, the outer diameter of the sampler is smaller than the inner diameter of the sealing tube seat, and the outer diameter of the sampler is larger than the inner diameter of the first sealing gasket.

7. The coal feeding equipment for a coal-fired power plant according to claim 1, characterized in that: The sampling tube holder comprises an extension tube and a plugging plate, wherein the plugging plate is provided with an opening for the sampler to extend into, and the extension tube and the plugging plate are distributed in a direction from the head end of the sampling tube holder to the tail end of the sampling tube holder and are fixed to the tail end of the first valve.

8. The coal feeding equipment for a coal-fired power plant according to claim 7, characterized in that: A second sealing gasket is provided between the end surface of the first valve and the end surface of the extension tube. A third sealing gasket is provided between the end surface of the blocking plate and the end surface of the extension tube. The outer diameter of the sampler is smaller than the inner diameter of the extension tube, the outer diameter of the sampler is smaller than the inner diameter of the opening of the blocking plate, the outer diameter of the sampler is larger than the inner diameter of the second sealing gasket, and the outer diameter of the sampler is larger than the inner diameter of the third sealing gasket.

9. The coal feeding equipment for a coal-fired power plant according to claim 1, characterized in that: The sampler comprises a hollow tube, a tail plug and a handle. The head end of the hollow tube is provided with a sampling port, the tail plug is provided at the tail end of the hollow tube, and the handle is provided at the tail plug.

10. The coal feeding equipment for a coal-fired power plant according to claim 9, characterized in that: The head end of the sampling tube seat points to the direction of the tail end of the sampling tube seat and is arranged obliquely in a direction from top to bottom.

11. A raw coal sampling device, characterized in that: Applicable to the coal feeding equipment of a coal-fired power plant described in any one of claims 1-10, the raw coal sampling device comprises: a sampling tube seat and a sampler, the sampling tube seat has a sampling tube cavity, the head end of the sampling tube seat is used to be arranged on the side wall of the lower coal pipe, and the head end of the sampling tube cavity is used to communicate with the lower coal pipe; the sampling tube seat is provided with a compressed air inlet and a first valve, the compressed air inlet and the first valve are sequentially distributed along the direction from the head end of the sampling tube seat to the tail end of the sampling tube seat, and the compressed air inlet is directly or indirectly connected with the sampling tube cavity; the sampler is detachably matched with the sampling tube seat, and when the first valve is opened, the sampler can extend into the sampling tube cavity through the tail end of the sampling tube seat and can extend into the lower coal pipe.

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