Pulverized coal lock hopper and pulverized coal conveying system

Abstract

The utility model provides a pulverized coal lock hopper and a pulverized coal conveying system. The pulverized coal lock hopper comprises a conical shell, a connecting pipe and a gas ejector pipe, the connecting pipe is arranged on the side wall of the conical shell, one end of the connecting pipe extends into the conical shell from the outside of the conical shell, and an air inlet channel is formed in the inner space of the connecting pipe; the gas spraying pipe is fixed to the inner side wall face of the conical shell and communicates with the end, located in the conical shell, of the connecting pipe, a gas spraying channel is formed in the inner space of the gas spraying pipe, and gas spraying holes are formed in the pipe wall of the gas spraying pipe so that gas can be sprayed out to the center of the conical shell through the gas spraying holes. A ventilation channel which is smoother in circulation is directly formed in the connecting pipe, so that gas is not easy to block; and the problem that the connecting pipe vibrates due to the high gas flow rate is solved, and the safety of gas introduction is improved. And the connecting pipe and the pulverized coal lock hopper are integrally manufactured and processed, so that the problem of difficulty in assembling the inflating whistle pipe and the connecting pipe in the existing structure is solved, and the labor intensity of processing the pulverized coal lock hopper and the additional pipeline stress caused by a tool are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder lock buckets, in particular to a coal powder lock bucket and a coal powder conveying system. Background Art

[0002] Pulverized coal pressurized gasification technology is a rapidly developing clean coal utilization technology in recent years, and has been widely used in the methanol, fertilizer and other industries. In the pulverized coal gasification device, pulverized coal is one of the raw materials for gasification reaction, and the stability of pulverized coal supply is crucial. After being pressurized, the pulverized coal is sent to the burner and oxygen from the air separation unit from top to bottom by gravity through the pulverized coal storage tank, pulverized coal lock hopper and pulverized coal feeding tank, and then to the gasifier for gasification and combustion reaction. Among them, the pulverized coal lock hopper is an important equipment for realizing periodic discharge operation during pulverized coal transportation. The fine pulverized coal particles in the gas phase medium are periodically accumulated and discharged at the outlet of the cone of the equipment, which is prone to loose adhesion and bridge formation, making the outlet of the pulverized coal lock hopper very easy to be blocked. Among them, the aeration flute is an important equipment to ensure the stable transportation of pulverized coal in the cone of the pulverized coal lock hopper. By introducing inert gas into the aeration flute, the pulverized coal on the inner surface of the pulverized coal lock hopper can be fluidized, thereby realizing a uniform and stable pulverized coal feeding process.

[0003] like Figure 1 As shown in the figure, the inflatable flute installed in the traditional coal powder lock bucket adopts a detachable three-way pipe structure. The inflatable flute and the three-way pipe (i.e., the connecting pipe) are connected by welding or flange to purge the lock bucket to complete the periodic unloading process of the lock bucket. However, in order to realize the detachable installation of the inflatable flute, its tooling is relatively complicated, and the center line of the flange of the inflatable flute and the center line of the pipeline are often misaligned. In addition, because the space for installing the coal powder lock bucket is relatively small and the construction welding space is limited, welding and detection are difficult, and internal leakage often occurs. The purge gas is ejected at high speed at the defect, and the corners are often worn through, which is not conducive to the long-term safe and stable operation of the pulverized coal lock bucket. In addition, since the inflatable flute is connected to the pulverized coal lock bucket through a flange connection, the tolerance matching requirements of the overall structure are relatively high. During the equipment tooling process, it is often difficult to assemble the air inlet of the inflatable flute and the pipeline. In addition, the diameter of the outlet opening of the inflatable flute is small, about 6mm, which is very easy to be blocked, and the air intake speed is high, which is often easy to be impacted and torn. Due to the large size of the inflatable flute, the high installation height and the complicated tooling requirements, it is extremely difficult to inspect and maintain, and the heavy workload and long maintenance and downtime will bring huge economic losses. In addition, in order to complete the above-mentioned detachable structure, the flow channel of the inflatable flute airflow mostly adopts right-angle transition, which increases the abrasion and impact of the inert conveying gas on the inflatable flute body, and the irregular vibration of the inflatable flute is more obvious. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a pulverized coal lock bucket and a pulverized coal conveying system, so as to solve the problems of difficult installation and easy damage of the structure caused by the detachable connection mode of the inflation flute in the prior art.

[0005] The embodiment of the utility model adopts the following technical solution: a pulverized coal lock bucket, comprising:

[0006] A conical shell, the bottom end of which is provided with a feeding port;

[0007] A connecting pipe, which is arranged on the side wall of the cone shell, and one end of the connecting pipe extends from outside the cone shell to inside the cone shell, and the inner space of the connecting pipe is formed as an air inlet channel, so that the gas outside the cone shell can enter the air inlet channel;

[0008] An injection pipe is fixed on the inner wall of the cone shell, and the middle part of the injection pipe is connected with one end of the connecting pipe located in the cone shell, the inner space of the injection pipe forms an injection channel, and the wall of the injection pipe is provided with an injection hole, so that the gas in the air inlet channel can be ejected toward the center of the cone shell through the injection channel and the injection hole.

[0009] In some embodiments, the air inlet passage has an air inlet and an air outlet, the air inlet is located outside the cone shell, and the air outlet is located inside the cone shell;

[0010] The pulverized coal lock bucket further comprises an elliptical seal head, which is arranged on the inner wall surface of the cone shell and directly faces the gas outlet;

[0011] The injection pipe includes a first injection pipe and a second injection pipe, one end of the first injection pipe and one end of the second injection pipe are respectively sealed and connected to the elliptical head, and the other end of the first injection pipe and the other end of the second injection pipe extend obliquely upward and obliquely downward along the inner wall of the cone shell respectively.

[0012] In some embodiments, the air injection pipe includes a backing plate and a half pipe having a semicircular arc cross section;

[0013] The pad is a flat plate, one surface of which is attached to the inner wall of the cone shell, and the pad is welded and fixed to the inner wall of the cone shell;

[0014] The half pipe is sealed and welded to the backing plate, and another plate surface of the backing plate forms a part of the inner wall of the air injection pipe.

[0015] In some embodiments, the space inside the first jet pipe forms a first jet channel, and the space inside the second jet pipe forms a second jet channel;

[0016] The other end of the first jet pipe and the other end of the second jet pipe are respectively provided with a first blocking cap and a second blocking cap, so as to block the top end of the first jet channel and the bottom end of the second jet channel respectively.

[0017] In some embodiments, the first blocking cap is seal-welded to the other end of the first gas injection pipe and the backing plate;

[0018] The second blocking cap is detachably arranged at the other end of the second air injection pipe.

[0019] In some embodiments, the wall thickness of the elliptical head is greater than the wall thickness of the injection pipe.

[0020] In some embodiments, the jet pipe is provided with a plurality of jet holes along its axial direction and connected to the outside of the jet channel.

[0021] In some embodiments, a connecting flange is provided at one end of the connecting pipe outside the conical shell, and the connecting flange is sealed and connected to the air supply equipment.

[0022] In some embodiments, the pulverized coal lock bucket includes more than two connecting pipes and the injection pipes, and the connecting pipes and the injection pipes are evenly arranged along the circumference of the cone shell.

[0023] The utility model also discloses a pulverized coal conveying system, comprising a pulverized coal lock bucket as described in any one of the above embodiments.

[0024] The beneficial effects of the embodiments of the utility model are:

[0025] The air intake passage is directly formed by the connecting pipe arranged on the cone shell, instead of using the traditional detachable matching method of the gas-filled flute and the connecting pipe to complete the gas introduction into the cone shell. Moreover, the inner diameter of the connecting pipe in the utility model is significantly larger than that of the gas-filled flute in the existing structure, so that the gas is smoother and less likely to be blocked when it is introduced into the cone shell; at the same time, the connecting pipe will not vibrate due to the high gas flow rate, thereby improving the safety of gas introduction and the life of the coal powder lock bucket. In addition, the connecting pipe and the coal powder lock bucket are manufactured and processed as a whole, which solves the problem of difficult assembly of the gas-filled flute and the connecting pipe in the existing structure, and reduces the labor intensity of coal powder lock bucket processing and the additional pipeline stress caused by tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a schematic diagram of the traditional coal powder lock bucket structure.

[0028] Figure 2 It is a structural schematic diagram of the coal powder lock bucket of the utility model.

[0029] Figure 3 For this utility model Figure 1 Schematic diagram of the structure of the central jet pipe and the elliptical head when viewed from the A direction.

[0030] Figure 4 This is another structural schematic diagram of the coal powder lock bucket of the utility model.

[0031] Figure 5 It is a schematic diagram of the radial cross-section structure of the jet pipe of the utility model.

[0032] Figure 6 This is another schematic diagram of the radial cross-section structure of the jet pipe of the utility model.

[0033] Reference numerals: 1, cone shell; 101, feed opening;

[0034] 2. Connecting pipe; 201. Air inlet channel; 202. Air inlet; 203. Air outlet; 204. Connecting flange;

[0035] 3. jet pipe; 301. jet hole; 302. first jet pipe; 303. second jet pipe; 304. pad; 305. half pipe; 306. first blocking cap; 307. second blocking cap;

[0036] 4. Elliptical head. DETAILED DESCRIPTION

[0037] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0038] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of the embodiments. Other modifications within the scope and spirit of the present utility model will occur to those skilled in the art.

[0039] The accompanying drawings, which are included in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, are used to explain the principles of the present invention.

[0040] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0041] It should also be understood that, although the present invention has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present invention with certainty, which have features such as the above-mentioned "utility model content" and are therefore within the scope of protection defined thereby.

[0042] The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0043] Specific embodiments of the present invention are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present invention, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present invention. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as the basis and representative basis for the above-mentioned "utility model content" to teach those skilled in the art to use the present invention in a variety of ways with substantially any suitable detailed structure.

[0044] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present invention.

[0045] In order to solve the problems in the background technology, the utility model discloses a pulverized coal lock bucket. Figure 2 The coal powder lock bucket includes a cone shell 1, a connecting pipe 2 and an injection pipe 3.

[0046] The cone shell 1 is in a structural form with a large outer diameter at the top and a small outer diameter at the bottom. The top of the cone shell 1 is open, and a discharge port 101 is provided at the bottom. The coal powder can enter the cone shell 1 through the opening at the top of the cone shell 1. The coal powder that enters the cone shell 1 from the opening at the top of the cone shell 1 can be gathered to the bottom of the cone shell 1 along the inner wall of the cone shell 1 under the action of gravity, and discharged through the discharge port 101 at the bottom of the cone shell 1.

[0047] The connecting pipe 2 is arranged on the side wall of the cone shell 1. Specifically, the connecting pipe 2 is welded and fixed on the side wall of the cone shell 1, and is located in the middle of the cone shell 1 in the axial direction of the cone shell 1. One end of the connecting pipe 2 extends from the outside of the cone shell 1 to the inside of the cone shell 1, that is, the connecting pipe 2 passes through the side wall of the cone shell 1, and the end of the connecting pipe 2 that passes through the cone shell 1 can be flush with the inner wall of the cone shell 1; the other end of the connecting pipe 2 is located outside the cone shell 1, and is used to connect with the gas supply equipment. The inner space of the connecting pipe 2 is formed as an air intake channel 201, so that the gas outside the cone shell 1 can enter the air intake channel 201. Specifically, the gas supply equipment serves as a gas source, is connected to the connecting pipe 2, and passes the gas into the air intake channel 201. The space inside the connecting pipe 2 directly forms the air intake channel 201, instead of setting a detachable air flute in the connecting pipe 2. The inner diameter of the connecting pipe 2 (about 100mm to 150mm) is larger than the inner diameter of the air flute in the existing structure, so that the air intake channel 201 formed in the connecting pipe 2 is smoother when the gas is introduced than the air intake channel 201 formed by the air flute in the existing structure, and the air intake channel 201 is not easy to be blocked, which solves the problem of frequent maintenance of the coal powder lock bucket caused by the blockage of the air flute in the existing structure. In addition, because the connecting pipe 2 and the cone shell 1 are welded and fixed as a whole, the inner diameter of the connecting pipe 2 is larger, so that the air intake channel 201 of the connecting pipe 2 will not vibrate even when a high flow rate of gas is introduced, which improves the safety when the gas is introduced and the life of the coal powder lock bucket is increased. The connecting pipe 2 and the pulverized coal lock bucket are integrally manufactured and processed, which solves the problem of difficult assembly of the inflation flute pipe and the connecting pipe 2 in the existing structure, and reduces the labor intensity of the pulverized coal lock bucket processing and the additional pipeline stress caused by the tooling.

[0048] The jet pipe 3 is fixed on the inner wall of the cone shell 1. Specifically, the outer wall of the jet pipe 3 is welded and fixed on the inner wall of the cone shell 1 along the length direction of the jet pipe 3. In addition, the middle part of the jet pipe 3 is connected to one end of the connecting pipe 2 located in the cone shell 1, and the inner space of the jet pipe 3 forms a jet channel. Compared with the design in the existing structure that the jet pipe 3 is fixed on the inner wall of the cone shell 1 by two fixing frames, the connection between the jet pipe 3 and the cone shell 1 in the embodiment of the utility model is more firm. When the gas with a higher flow rate enters the jet pipe 3 through the air inlet channel 201 in the connecting pipe 2, the jet pipe 3 will not vibrate, which further improves the service life of the coal powder lock bucket. The jet hole 301 is provided on the pipe wall of the jet pipe 3. The jet hole 301 connects the jet channel in the jet pipe 3 with the environment outside the jet pipe 3, so that the gas in the air inlet channel 201 can be ejected toward the center of the cone shell 1 through the jet channel and the jet hole 301. Since the gas velocity is relatively high, the gas ejected through the jet hole 301 still has a relatively high velocity, and the gas ejected through the jet hole 301 can be sprayed to the coal powder in the cone shell 1 to prevent the coal powder from accumulating in the cone shell 1 to form bridges and affect the normal feeding of the coal powder.

[0049] The embodiment of the utility model directly forms the air intake passage 201 on the connecting pipe 2 arranged on the cone shell 1, instead of adopting the traditional method of detachably matching the inflation flute and the connecting pipe 2 to complete the introduction of gas into the cone shell 1. Moreover, the inner diameter of the connecting pipe 2 in the utility model is significantly larger than the inner diameter of the inflation flute in the existing structure, so that the gas is smoother when entering the cone shell 1 and is not easy to be blocked; at the same time, the connecting pipe 2 will not have the problem of vibration caused by the high gas flow rate, thereby improving the safety of gas introduction and increasing the life of the coal powder lock bucket.

[0050] In one embodiment of the present invention, the air inlet channel 201 has an air inlet 202 and an air outlet 203 , wherein the air inlet 202 is located outside the cone shell 1 , and the air outlet 203 is located inside the cone shell 1 .

[0051] The pulverized coal lock bucket also includes an elliptical seal 4, which is arranged on the inner wall of the cone shell 1 and directly faces the gas outlet 203. The space inside the elliptical seal 4 is relatively large. When the gas with a higher flow rate enters the elliptical seal 4 through the gas outlet 203 of the inlet channel 201, the larger space of the elliptical seal 4 can buffer the gas with a higher flow rate, effectively avoiding the structural vibration and rupture caused by the impact and abrasion when the gas is introduced. And the connecting pipe 2 is welded and fixed on the cone shell 1. The connecting pipe 2 corresponding to the position of the gas outlet 203 is subject to fatigue constraints and has a relatively large thickness. The impact of the low-speed gas wear on the connecting pipe 2 is relatively small.

[0052] The jet pipe 3 includes a first jet pipe 302 and a second jet pipe 303. One end of the first jet pipe 302 and one end of the second jet pipe 303 are respectively sealed and connected to the elliptical head 4 and communicated. For example, one end of the first jet pipe 302 and one end of the second jet pipe 303 are respectively welded and fixed to the elliptical head 4 and communicated. The gas entering the elliptical head 4 can enter the first jet pipe 302 from one end of the first jet pipe 302 and enter the second jet pipe 303 from one end of the second jet pipe 303, that is, enter the jet channel. Since the elliptical head 4 has buffered the gas with a higher flow rate to a certain extent, the gas flow rate entering the jet channel is relatively reduced, and will not cause impact on the jet pipe 3, thereby solving the problem of vibration of the jet pipe 3 caused by gas impact. The other end of the first jet pipe 302 and the other end of the second jet pipe 303 extend obliquely upward and obliquely downward along the inner wall of the cone shell 1, respectively. The first jet pipe 302 and the second jet pipe 303 can be arranged on the same straight line. Of course, it can be understood that the first jet pipe 302 and the second jet pipe 303 can also adopt other arrangements. This is only used as an example and does not constitute a limitation on the scope of protection of the claims.

[0053] In one embodiment of the present invention, Figure 2 , Figure 3 and Figure 4 The air injection pipe 3 includes a backing plate 304 and a half pipe 305 with a semicircular arc cross section.

[0054] Among them, combined Figure 5 and Figure 6 The backing plate 304 can be a flat plate or an arc-shaped plate with the same or equivalent curvature as the inner wall of the cone shell 1. One plate surface of the backing plate 304 is attached to the inner wall of the cone shell 1, and the backing plate 304 is welded and fixed on the inner wall of the cone shell 1. Specifically, the backing plate 304 can be but is not limited to being welded and fixed on the inner wall of the cone shell 1 by full penetration. The half pipe 305 is sealed and welded on the backing plate 304, and the other plate surface of the backing plate 304 or at least a part of the other plate surface forms part of the inner wall of the jet pipe 3. That is, the cross section of the half pipe 305 is a semicircular arc, and the half pipe 305 is a plate with a semicircular arc cross section as a whole, which is combined with the backing plate 304 to form a tube with a closed annular cross section, and the other plate surface of the backing plate 304 or at least a part of the other plate surface and one plate surface of the half pipe 305 are combined to form the inner wall of the jet pipe 3. The thickness of the backing plate 304 can be slightly thicker than that of the half pipe 305. The jet pipe 3 can be pre-welded and fixed on the inner wall of the cone shell 1 by the backing plate 304, and form a whole with the cone shell 1, thereby enhancing the rigidity of the jet pipe 3 itself, making the overall structure more solid, avoiding the vibration of the jet pipe 3 when the air pressure in the jet channel is slightly unstable due to the local blockage of the jet hole 301, and solving the problem of vibration and rupture of the jet pipe 3 caused by the impact when the gas is introduced in the existing structure. Because the wall thickness of the half pipe 305 is relatively thin, even if there is a local blockage or abrasion problem, it can be cut and then welded for processing. The above processing greatly reduces the frequency and duration of equipment maintenance, and reduces the cost of tooling and maintenance. It is conducive to the long-term stable operation of the gasification device, greatly reducing the risk of rupture of the connecting pipe 2 and the jet pipe 3, thereby ensuring the economic benefits of the overall device. Of course, it is understandable that the jet pipe 3 can be welded and fixed on the inner wall of the cone shell 1 by an integrated round tube. This is only used as an example and does not constitute a limitation on the scope of protection of the claims.

[0055] In one embodiment of the present invention, Figure 3 The space inside the first jet pipe 302 forms a first jet channel, and the space inside the second jet pipe 303 forms a second jet channel.

[0056] The other end of the first jet pipe 302 and the other end of the second jet pipe 303 are respectively provided with a first blocking cap 306 and a second blocking cap 307, which are used to respectively block the top end of the first jet channel and the bottom end of the second jet channel, so that all the gas entering the jet pipe 3 can be ejected toward the center of the cone shell 1 through the jet hole 301, so as to ensure the blowing effect of the gas ejected from the jet pipe 3 on the coal powder in the cone shell 1.

[0057] In one embodiment of the present invention, the first blocking cap 306 is sealed and welded to the other end of the first gas injection pipe 302 and the backing plate 304. The first blocking cap 306 can adopt a conical cap structure to prevent coal powder from accumulating on the top of the first gas injection pipe 302.

[0058] The second blocking cap 307 is detachably arranged at the other end of the second air injection pipe 303. For example, the second blocking cap 307 is detachably connected to the other end of the second air injection pipe 303 in the form of a buckle. When there is coal powder in the air injection pipe 3, the second blocking cap 307 can be removed to clean the air injection pipe 3, thereby ensuring the air injection effect of the air injection pipe 3.

[0059] In one embodiment of the present invention, the wall thickness of the elliptical seal head 4 is greater than the wall thickness of the injection pipe 3, thereby increasing the service life of the elliptical seal head 4 directly facing the air outlet 203 of the air inlet channel 201.

[0060] In one embodiment of the utility model, the air injection pipe 3 is provided with a plurality of air injection holes 301 connected to the outside of the air injection channel along its axial direction, and a certain distance is provided between two adjacent air injection holes 301. The aperture of the air injection holes 301 can be, but is not limited to, set to about 6 mm, which can ensure the injection effect and prevent the coal powder in the cone shell 1 from easily entering the air injection pipe 3. The air injection holes 301 can be arranged in more than two rows along the circumference of the air injection pipe 3 to inject the coal powder at multiple angles in the cone shell 1, thereby improving the injection effect of the coal powder in the cone shell 1.

[0061] In one embodiment of the utility model, a connecting flange 204 is provided at one end of the connecting pipe 2 outside the cone shell 1, and the connecting flange 204 is sealed and connected to the gas supply device. The connecting pipe 2 is directly connected to the steam supply device, the tooling is simple, and the force of the pipe mouth of the hard connection is avoided.

[0062] In one embodiment of the utility model, the coal powder lock bucket includes more than two connecting pipes 2 and gas injection pipes 3, and the connecting pipes 2 and gas injection pipes 3 are evenly arranged along the circumference of the cone shell 1. For example, Figure 4 As shown, the pulverized coal lock bucket includes six connecting pipes 2 and injection pipes 3. Of course, it is understandable that the number of connecting pipes 2 and injection pipes 3 can be reasonably selected according to actual production needs. This is only used as an example and does not constitute a limitation on the scope of protection of the claims.

[0063] The utility model also discloses a pulverized coal conveying system. The pulverized coal conveying system comprises a pulverized coal lock bucket as described in any one of the above embodiments.

[0064] The above describes in detail a number of embodiments of the present invention, but the present invention is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concept of the present invention, and these variations and modifications should all fall within the scope of protection claimed by the present invention.

Claims

1. A pulverized coal lock bucket, characterized in that: include: A conical shell, the bottom end of which is provided with a feeding port; A connecting pipe, which is arranged on the side wall of the cone shell, and one end of the connecting pipe extends from outside the cone shell to inside the cone shell, and the inner space of the connecting pipe is formed as an air inlet channel, so that the gas outside the cone shell can enter the air inlet channel; An injection pipe is fixed on the inner wall of the cone shell, and the middle part of the injection pipe is connected with one end of the connecting pipe located in the cone shell, the inner space of the injection pipe forms an injection channel, and the wall of the injection pipe is provided with an injection hole, so that the gas in the air inlet channel can be ejected toward the center of the cone shell through the injection channel and the injection hole.

2. The pulverized coal lock bucket according to claim 1, characterized in that: The air inlet passage has an air inlet and an air outlet, the air inlet is located outside the cone shell, and the air outlet is located inside the cone shell; The pulverized coal lock bucket further comprises an elliptical seal head, which is arranged on the inner wall surface of the cone shell and directly faces the gas outlet; The injection pipe includes a first injection pipe and a second injection pipe, one end of the first injection pipe and one end of the second injection pipe are respectively sealed and connected to the elliptical head, and the other end of the first injection pipe and the other end of the second injection pipe extend obliquely upward and obliquely downward along the inner wall of the cone shell respectively.

3. The pulverized coal lock bucket according to claim 2, characterized in that: The jet pipe comprises a backing plate and a half pipe with a semicircular arc cross section; The pad is a flat plate, one surface of which is attached to the inner wall of the cone shell, and the pad is welded and fixed to the inner wall of the cone shell; The half pipe is sealed and welded to the backing plate, and another plate surface of the backing plate forms a part of the inner wall of the air injection pipe.

4. The pulverized coal lock bucket according to claim 3, characterized in that: The inner space of the first jet pipe forms a first jet channel, and the inner space of the second jet pipe forms a second jet channel; The other end of the first jet pipe and the other end of the second jet pipe are respectively provided with a first blocking cap and a second blocking cap, so as to block the top end of the first jet channel and the bottom end of the second jet channel respectively.

5. The pulverized coal lock bucket according to claim 4, characterized in that: The first blocking cap is sealed and welded to the other end of the first gas injection pipe and the backing plate; The second blocking cap is detachably arranged at the other end of the second air injection pipe.

6. The pulverized coal lock bucket according to claim 2, characterized in that: The wall thickness of the elliptical head is greater than the wall thickness of the injection pipe.

7. The pulverized coal lock bucket according to claim 1, characterized in that: The jet pipe is provided with a plurality of jet holes along its axial direction and connected to the outside of the jet channel.

8. The pulverized coal lock bucket according to claim 1, characterized in that: A connecting flange is provided at one end of the connecting pipe outside the cone shell, and the connecting flange is sealed and connected to the air supply equipment.

9. The pulverized coal lock bucket according to claim 1, characterized in that: The pulverized coal lock bucket comprises more than two connecting pipes and the gas injection pipes, and the connecting pipes and the gas injection pipes are evenly arranged along the circumference of the cone shell.

10. A pulverized coal conveying system, characterized in that: It comprises the pulverized coal lock bucket as described in any one of claims 1 to 9.

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