Hyperbolic curve coal bucket cross pipe batching device
By designing a hyperbolic coal bucket cross-pipe batching device in the coal bucket system, the problems of blockage and agglomeration during the raw coal transportation process are solved, and the smoothness of coal flow and the improvement of boiler combustion efficiency are achieved.
Patent Information
- Application Number
- CN202422116097.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The existing coal bucket system is prone to problems such as blockage and agglomeration during the transportation of raw coal, resulting in poor coal flow and affecting the boiler combustion efficiency and the safety of power station operation.
A hyperbolic coal bucket cross-pipe batching device is designed. By setting up a cross-coal splitting pipe between the two raw coal buckets, the interconnection and interconnection between the two coal buckets can be achieved, and coal mixing can be done reasonably according to the boiler load and coal type.
The seamless connection between the two raw coal buckets is achieved, the resistance in material circulation is reduced, blockage and agglomeration is avoided, and the smoothness of the coal flow and the combustion efficiency of the boiler are improved.
Smart Images
Figure CN222974410U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal bunker material conveying, and more specifically, to a hyperbolic coal bunker cross-pipe batching device. Background Art
[0002] With the rise of photovoltaic and wind power in China, the power grid load will be greatly impacted by the grid connection of photovoltaic and wind power during the day. Therefore, it is required that thermal power plants have the ability of wide-range peak regulation to meet the needs of the power market. The coal feeding system of power plants is an important system for boiler energy supply. It conveys raw coal to the raw coal bunker by belt and then supplies it to the boiler for combustion through the coal dropping pipe and coal feeder. The raw coal dug out from the ground usually has a water content of 8%-16%. After being stored outdoors and exposed to rain many times, the surface water content of the coal is relatively large. Therefore, it is very easy to form arches, congestions, and coal blockages after entering the raw coal bunker. In addition, in Northeast China, the winter temperature can reach below -30°C. After the raw coal enters the coal bunker, it will form lumps due to frost thawing. If lumps often appear in the coal bunker, it will cause arching and coal blockage. Generally, the arching position is at the junction of the raw coal bin and the coal dropping pipe, resulting in more serious problems such as congestion and blockage.
[0003] At present, the large-diameter coal inlet and small-diameter coal outlet at home and abroad generally adopt the technology of activated wedge-shaped coal bunker plus vibrator or inverted frustum-shaped coal bunker plus air cannon. The wall of the activated wedge-shaped coal bunker is spliced by multiple flat plates, so there are many hard bends and variable-diameter gentle slopes at the joints, which directly affects the flow of raw coal with a large water content and cannot achieve the purpose of smooth dredging. Although the inverted frustum-shaped coal bunker solves the hard bends and variable-diameter gentle slopes of the coal bunker, due to the shape of the inverted frustum-shaped coal bunker being a uniform-diameter contraction, the focus of the contradiction is directly concentrated at the outlet of the coal bunker. Therefore, there are often situations where the coal flow is blocked at the outlet of the coal bunker.
[0004] The existing technology forms a certain obstruction to the coal dropping pipe of the raw coal bunker and the coal flow, resulting in the inability to effectively circulate the blocked coal. At present, in major power stations and production enterprises in China, if the material flow is blocked in the supply device, most of the reasons are due to the existence of friction dead angles during the process of the device diameter changing from large to small. After this situation occurs, the staff can only use an iron hammer to manually knock and a hollow cannon to loosen the blocked coal, but the loosening efficiency is low, resulting in the coal quantity entering the boiler not reaching the standard, and in severe cases, the material is interrupted, resulting in production stoppage accidents. Content of the Utility Model
[0005] To overcome the above defects, the utility model provides a hyperbolic coal bunker cross-pipe batching device. A cross coal distribution pipe is installed between two raw coal bunkers to realize the interconnection and intercommunication between the two raw coal bunkers, and it can be arbitrarily switched for operation. Reasonable coal blending can be carried out according to the boiler load and coal type, and it has the advantages of simple structure, convenient operation, small maintenance amount, and safety and reliability.
[0006] To achieve the above object, the utility model provides a batching device for the cross pipe of a hyperbolic coal bunker, which is arranged between two adjacent raw coal bunkers and includes two coal distribution pipes arranged in a cross shape of "X". The two adjacent raw coal bunkers are divided into a left raw coal bunker and a right raw coal bunker. Hyperbolic coal bunkers are provided at the bottoms of the left raw coal bunker and the right raw coal bunker. A coal feeder and a coal mill are sequentially connected to the bottom of the hyperbolic coal bunker. One upper port of the two coal distribution pipes is connected and communicated with the side wall of the left raw coal bunker, and the lower port is connected and communicated with the inlet coal dropping pipe of the coal mill below the right raw coal bunker. The other upper port of the two coal distribution pipes is connected and communicated with the side wall of the right raw coal bunker, and the lower port is connected and communicated with the inlet coal dropping pipe of the coal mill below the left raw coal bunker.
[0007] Preferably, a first electrically adjustable plug door and an ultrasonic flowmeter are provided on the pipeline at one end of the coal distribution pipe close to the raw coal bunker, and first metal compensators are provided on the pipelines at both ends close to the inlet coal dropping pipe of the coal mill. The first electrically adjustable plug door is located between the ultrasonic flowmeter and the side wall of the raw coal bunker. The first metal compensator is connected to the coal feeder to provide length compensation for temperature change.
[0008] Preferably, a double-sealing component is provided inside the first electrically adjustable plug door to prevent coal powder from leaking. Electric devices are provided on both sides of the first electrically adjustable plug door. The electric devices are telescopically connected with a plug, and the opening and closing of the first electrically adjustable plug door are controlled by driving the plug through the electric devices.
[0009] Preferably, the cylinders at both ends of the first electrically adjustable plug door are connected to the controller of the first electrically adjustable plug door, and the controller of the first electrically adjustable plug door is electrically connected to the ultrasonic flowmeter.
[0010] Preferably, the upper openings of the two coal distribution pipes arranged in a cross shape of "X" are connected to the two adjacent raw coal bunkers in a shape of a line of intersection, so as to achieve seamless connection between the coal distribution pipes and the raw coal bunkers.
[0011] Preferably, the included angles between the two coal distribution pipes on the left and right sides of the two coal distribution pipes arranged in a cross shape of "X" are both 70°-75°.
[0012] Preferably, a plurality of first pneumatic vibrating devices are arranged on the side wall of the coal distribution pipe at intervals up and down and staggered.
[0013] Preferably, a plurality of second pneumatic vibrating devices are arranged on the side wall of the hyperbolic coal bunker at intervals up and down and staggered.
[0014] Preferably, a second electrically adjustable slide gate and a second metal compensator are provided at the lower part of the side wall of the hyperbolic coal bunker. The second metal compensator is located between the second electrically adjustable slide gate and the coal feeder and is used to provide length compensation for temperature change.
[0015] As can be seen from the above technical solutions, compared with the prior art, the hyperbolic coal bunker cross-pipe batching device provided by the present utility model is arranged between two adjacent raw coal bunkers. The coal distribution device in the form of a cross-pipe is used to connect between two adjacent coal bunkers, realizing the interconnection and intercommunication between the two raw coal bunkers, and can be switched arbitrarily during operation, achieving good effects of coal blending, coal control, and coal dredging when coal flow is blocked, and better ensuring the safety of the device during use; the structure of this cross-pipe batching device is simple, the inner wall friction of the cross-pipe is small, which can reduce the resistance between the inner wall and the raw coal, enable the effective flow of materials, and realize reasonable coal distribution and coal batching work. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.
[0017] Figure 1 It is a schematic assembly structure diagram of the hyperbolic coal bunker cross-pipe batching device of the present utility model;
[0018] Figure 2 It is a schematic structure diagram of the coal distribution pipe of the present utility model.
[0019] In the figure, 1, raw coal bunker; 2, coal feeder; 3, coal mill; 4, coal distribution pipe; 5, first electrically adjustable slide gate; 6, ultrasonic flowmeter; 7, first metal compensator; 8, first pneumatic vibrating device; 9, second pneumatic vibrating device; 10, hyperbolic coal bunker; 11, second electrically adjustable slide gate; 12, second metal compensator. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] Please refer to the attached Figure 1-2 , which discloses a hyperbolic coal bunker cross-pipe batching device of the present utility model.
[0022] The hyperbolic coal bunker cross-pipe batching device provided by the utility model is arranged between two adjacent raw coal bunkers 1, and includes two coal distribution pipes 4 arranged in a cross-shaped structure in an "X" shape. The two adjacent raw coal bunkers 1 are divided into a left raw coal bunker and a right raw coal bunker. The bottom ends of the left raw coal bunker and the right raw coal bunker are both provided with hyperbolic coal bunkers 10. The bottom ends of the hyperbolic coal bunkers 10 are sequentially connected with coal feeders 2 and coal mills 3. One upper port of the two coal distribution pipes 4 is connected and communicated with the side wall of the left raw coal bunker 1, and the lower port is connected and communicated with the inlet coal dropping pipe of the coal mill 3 below the right raw coal bunker 1. The other upper port of the two coal distribution pipes 4 is connected and communicated with the side wall of the right raw coal bunker 1, and the lower port is connected and communicated with the inlet coal dropping pipe of the coal mill 3 below the left raw coal bunker 1. In this way, the intercommunication and mutual use between the two groups of raw coal bunkers 1 can be realized, and the operation can be arbitrarily switched, achieving good effects of coal blending, coal control, and coal dredging when coal flow is blocked, and better ensuring the safety of the device during use.
[0023] It should be noted that the coal distribution pipe 4 is a cylinder with upper and lower openings, and its upper opening is connected to the raw coal bunker 1 in a form of a line of intersection, that is, the upper openings of the two coal distribution pipes 4 arranged in a cross-shaped structure in an "X" shape are connected to the two adjacent raw coal bunkers 1 in a form of a line of intersection, so as to achieve seamless connection between the coal distribution pipe 4 and the raw coal bunker 1, and effectively avoid the scattering of materials.
[0024] On the pipeline of the coal distribution pipe 4 near one end of the raw coal bunker 1, a first electrically adjustable plug door 5 and an ultrasonic flowmeter 6 are provided, and on the pipeline near one end of the inlet coal dropping pipe of the coal mill 3, a first metal compensator 7 is provided. The first electrically adjustable plug door 5 is located between the ultrasonic flowmeter 6 and the side wall of the raw coal bunker 1. The first metal compensator 7 is connected to the coal feeder 2 to provide length compensation for temperature change. The cylinders at both ends of the first electrically adjustable plug door 5 are connected to the controller of the first electrically adjustable plug door 5, and the controller of the first electrically adjustable plug door 5 is electrically connected to the ultrasonic flowmeter 6, and the accurate control of the flow output is realized by measuring the flow in the coal distribution pipe 4.
[0025] It should be noted that an ultrasonic flowmeter refers to a flowmeter developed based on the principle that the propagation speed of ultrasonic waves in a flowing medium is equal to the vector sum of the average flow velocity of the measured medium and the velocity of sound waves in a stationary medium, and is mainly composed of a transducer and a converter, and has different types such as Doppler method, velocity difference method, beam offset method, noise method, and correlation method.
[0026] The top end of the coal distribution pipe 4 is connected to the first electrically adjustable plug valve 5 through a section of pipeline, and then connected to the first metal compensator 7 at the lower part of the coal distribution pipe 4 after another section of pipeline. The first metal compensator 7 is then connected to the inlet coal dropping pipe of the coal mill 3 through a section of pipeline. Among them, the first electrically adjustable plug valve 5 is connected to the flowmeter 6 through a controller, so as to adjust the flow through the measurement feedback signal of the flow 6. The first metal compensator 7 is used to provide long and short compensation for temperature change. Similarly, the bypass of the adjacent raw coal bunker 1 is connected to the coal feeder 2 of the equipment in the same way to realize the interconnection and interchange between the two groups of raw coal bunkers 1.
[0027] Therefore, an ultrasonic flowmeter 6 is installed in the coal distribution pipe 4. When the ultrasonic flowmeter 6 sends a flow signal to the first electrically adjustable plug valve 5, the flow is adjusted by controlling the opening degree of the first electrically adjustable plug valve 5. At the same time, when the raw coal bunker 1 is blocked, the first electrically adjustable plug valve 5 can be opened to help clear the blockage of the raw coal bunker 1 in the form of bypass. The material pressure in the main road of the raw coal bunker 1 is reduced, making the inside of the raw coal bunker 1 unobstructed. It can also replace the main road output when the main road of the raw coal bunker 1 fails, playing a role in flexible ratio between adjacent two groups of coal bunkers.
[0028] It should be noted that the first electrically adjustable plug valve 5 can play the function of controlling the opening and closing of the pipeline at any time. A double-sealing component is provided inside the first electrically adjustable plug valve 5, which can effectively prevent the leakage of pulverized coal. Electric drives are provided on both sides of the first electrically adjustable plug valve 5, and each electric drive is telescopically connected to a plug. The plug is made of stainless steel and is driven by an electric device to open, close and adjust.
[0029] The included angles between the left and right sides of the two coal distribution pipes 4 arranged in a cross-shaped "X" structure are both 70° - 75°. A plurality of first pneumatic vibrating devices 8 are arranged on the side wall of the coal distribution pipe 4 at staggered intervals up and down. A plurality of second pneumatic vibrating devices 9 are arranged on the side wall of the hyperbolic coal bunker 10 at staggered intervals up and down, which can better achieve the effect of clearing blockages.
[0030] It should be noted that based on the analysis of the reasons for material bridging and blockage, factors such as material particle size, surface temperature, the form of feeder 2, the structure form of the bunker, and the specific location of material bridging and blockage are considered. Generally, the bridging and blockage positions are at the junction of the bunker and the feeding pipe, where the flow area is the smallest, the extrusion pressure on the material is the greatest, the friction and adhesion force between materials are the largest. After being extruded, the materials stick together to form a bridging arch and caking phenomenon. Another situation is that due to the slow freezing of materials in winter, materials caking occurs above the feeder, causing the belt of feeder 2 to be unable to carry the materials away, resulting in jamming. Therefore, the hyperbolic coal bunker cross-pipe batching device in the present utility model forms the connection between two adjacent coal bunkers through a certain angle. Through reasonable angle arrangement, it can reduce the resistance between the inner wall and the raw coal, enable the materials to flow effectively, avoid material bridging and blockage, and the streamline of the whole cylinder is smoothly transitioned without dead ends, which can achieve an effective and smooth effect and will not cause scraping or hanging phenomena, realizing reasonable coal distribution and batching work. Preferably, when the included angles on both the left and right sides between the two coal distribution pipes 4 in the "X" - shaped cross - set coal distribution pipes 4 are both 70° - 75°, the effect is the best. The size of the feed inlet is determined according to the structure of the raw coal bunker, and the characteristics of the discharge outlet and the structure of the feeding pipe are determined according to the coal mill. Preferably, the lower opening diameter of the hyperbolic coal bunker cross - pipe batching device is between 600 - 700 mm.
[0031] On the lower parts of the side walls of the hyperbolic coal bunker 10, second electrically adjustable plug - doors 11 and second metal compensators 12 are provided. The second metal compensator 12 is located between the second electrically adjustable plug - door 11 and the coal feeder 2, and is used to provide length compensation for temperature changes.
[0032] It should be noted that the first metal compensator 7 and the second metal compensator 12 can be socket - type metal compensators or corrugated metal compensators, which can compensate for the length change of the coal bunker size caused by temperature changes at any time.
[0033] In summary, the cylinder of the coal distribution pipe 4 of the hyperbolic coal bunker cross - pipe batching device of the present utility model is reasonably designed, with a smooth linear flow and no dead ends, having a small resistance to coal flow. By adjusting the flow rate through the ultrasonic flowmeter 6, when the main - path coal flow of the raw coal bunker is interrupted, it can promptly feedback and issue a cleaning instruction, quickly assist in restoring the coal flow supply, and the recovery rate is above 99%. It has a wide application range and can effectively circulate various materials, with very high practicality.
[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A hyperbolic coal hopper cross pipe batching device, arranged between two adjacent raw coal hoppers (1), characterized in that: The invention comprises two coal distribution pipes (4) which are cross-arranged in an "X"-shaped structure. The two adjacent raw coal hoppers (1) are divided into a left raw coal hopper and a right raw coal hopper. The bottom ends of the left raw coal hopper and the right raw coal hopper are both provided with a hyperbolic coal hopper (10). The bottom ends of the hyperbolic coal hopper (10) are sequentially connected to a coal feeder (2) and a coal mill (3). Of the two coal distribution pipes (4), the upper end of one coal distribution pipe is connected and communicated with the side wall of the left raw coal hopper, and the lower end is connected and communicated with an inlet coal drop pipe of the coal mill (3) below the right raw coal hopper. The upper end of the other coal distribution pipe is connected and communicated with the side wall of the right raw coal hopper, and the lower end is connected and communicated with an inlet coal drop pipe of the coal mill (3) below the left raw coal hopper.
2. The hyperbolic coal hopper cross pipe batching device according to claim 1, characterized in that: A first electrically adjustable gate (5) and an ultrasonic flow meter (6) are provided on the pipelines of the two coal distribution pipes (4) near one end of the raw coal hopper (1), and a first metal compensator (7) is provided on the pipelines near one end of the inlet coal drop pipe of the coal mill (3). The first electrically adjustable gate (5) is located between the ultrasonic flow meter (6) and the side wall of the raw coal hopper (1). The first metal compensator (7) is connected to the coal feeder (2) and is used to provide length compensation for temperature changes.
3. The hyperbolic coal hopper cross pipe batching device according to claim 2 is characterized in that: The first electrically adjustable plug-in plate door (5) is provided with a double sealing assembly inside to prevent coal powder from leaking out. Electric devices are provided on both sides of the first electrically adjustable plug-in plate door (5). The electric devices are telescopically connected to the plug-in plates, and the plug-in plates are driven by the electric devices to control the opening and closing of the first electrically adjustable plug-in plate door (5).
4. The hyperbolic coal hopper cross pipe batching device according to claim 3 is characterized in that: The electric devices at both ends of the first electrically adjustable plug-in door (5) are connected to the controller of the first electrically adjustable plug-in door (5), and the controller of the first electrically adjustable plug-in door (5) is electrically connected to the ultrasonic flow meter (6).
5. The hyperbolic coal hopper cross pipe batching device according to claim 1, characterized in that: The upper end openings of the two coal distribution pipes (4) cross-arranged in an "X"-shaped structure are respectively connected to two adjacent raw coal hoppers (1) in an intersecting line, so that the coal distribution pipes (4) and the raw coal hoppers (1) are seamlessly connected.
6. The hyperbolic coal hopper cross pipe batching device according to claim 1, characterized in that: The angles on the left and right sides between the two coal distribution pipes (4) in the two coal distribution pipes (4) cross-arranged in an "X"-shaped structure are both greater than 70°-75°.
7. The hyperbolic coal hopper cross pipe batching device according to claim 1, characterized in that: The side wall of the coal distribution pipe (4) is provided with a plurality of first pneumatic rapping devices (8) which are arranged alternately in an upper and lower manner.
8. The hyperbolic coal hopper cross pipe batching device according to claim 1, characterized in that: The side wall of the hyperbolic coal hopper (10) is provided with a plurality of second pneumatic rapping devices (9) which are arranged alternately in an upper and lower manner.
9. The hyperbolic coal hopper cross pipe batching device according to claim 1, characterized in that: The lower part of the side wall of the hyperbolic coal hopper (10) is provided with a second electrically adjustable gate door (11) and a second metal compensator (12). The second metal compensator (12) is located between the second electrically adjustable gate door (11) and the coal feeder (2) and is used to provide long and short compensation for temperature changes.