Flexible non-sticky anti-blocking coal falling barrel

Abstract

The flexible non-stick anti-blocking coal drop barrel completely overturns the rigid structure of a traditional coal drop barrel in design, and the working face of the coal drop barrel is made of a flexible material and is composed of a rigid layer, a flexible layer, a wear-resistant layer and an anti-sticking layer. The rigid layer is responsible for providing support required for resisting coal flow impact; the flexible layer is responsible for surface deformation and area expansion and contraction; the wear-resistant layer is used for prolonging the service life of equipment and prolonging the maintenance period; the anti-sticking layer is made of a super-hydrophobic material sprayed on the wear-resistant layer, so that the surface of the anti-sticking layer is non-sticky, and the anti-sticking layer has anti-sticking and self-cleaning effects. And a knocking device is arranged outside the device. Protruding and sinking continuous deformation is generated on the bottom face of the coal falling barrel through knocking, so that hardened caking coal is broken. In the vibration process, the surface area of the bottom face of the coal falling barrel is rapidly increased and restored, the contact surface area of the bottom face and the caking coal is different, and therefore the caking coal is separated in the deformation that the bottom face continuously protrudes and sinks and then falls off from the bottom face.

Description

Technical Field

[0001] The utility model relates to a coal dropping tube of a coal conveying system in a coal-fired power plant. Background Art

[0002] Coal blockage in the coal dropping tube is a common fault in the coal conveying system of coal-fired power plants. Especially for circulating fluidized bed boilers, due to the combustion of low calorific value and small particle size coal, the coal blockage fault in its supporting coal conveying system occurs frequently, which seriously affects the safe and stable operation of the unit. Even worse, it may lead to consequences such as load reduction and oil-assisted combustion due to low coal level in the raw coal bunker, not only increasing production costs, but also resulting in grid dispatching assessment, bringing multiple economic losses to the enterprise. Currently, the common anti-blocking measures mainly include the following several kinds:

[0003] 1. Changing the shape of the coal dropping tube. For example, the cross-section of the coal dropping tube is changed from square to circular or with an arc bottom to eliminate the dead corners that are prone to coal adhesion; or a streamlined arc-shaped coal dropping pipe design is adopted to reduce the impact angle between the coal flow and the pipe wall, so as to reduce the probability of coal adhesion blockage. Such methods can only delay the development rate of adhesion, but cannot fundamentally eliminate coal blockage.

[0004] 2. Using lining materials with a small friction coefficient. For example, laying polymer materials or stainless steel linings. This method can reduce the friction between the coal and the inner wall of the coal dropping tube, accelerate the flow rate of the coal in the inclined coal dropping tube, and also delay the development rate of adhesion. However, under the impact of the coal flow during long-term operation, the wear-resistant lining of the coal dropping tube is prone to warping, increasing the flow resistance of the coal flow and thus causing coal blockage in the coal dropping tube.

[0005] 3. Using a vibration device for dredging. This method mainly uses the vibration of the vibration equipment to make the accumulated coal in the coal conveying system vibrate and then fall off from the coal conveying system. This is also a relatively common method adopted in the design of the vast majority of coal conveying systems. However, this method only has a certain effect on arching and bridging, but basically cannot make the adhered coal fall off.

[0006] 4. Manually cleaning the adhered coal and blocked coal. Although this method belongs to an original and backward working method in the face of modern highly automated and intelligent production technologies, it is still the most direct and effective way to eliminate coal blockage faults in all coal-fired power plants. Manual cleaning usually requires workers to enter the blocked equipment, where the space is narrow and there is no effective standing support surface. This not only increases the work intensity and cleaning difficulty of the workers, consumes a large amount of labor and time costs, and has low work efficiency, but also the workers need to be exposed to harmful substances such as coal dust, which will cause occupational health hazards, and at the same time, there is a great risk of personal injury accidents, bringing potential safety hazards to the enterprise's production safety. Content of the Utility Model

[0007] The main purpose of the utility model is to propose a flexible non-sticking anti-blocking coal dropping tube, which can effectively solve the problems in the background art.

[0008] In order to solve the problem that the existing anti-blocking measures cannot fundamentally eliminate the caking of coal on the working surface of the coal chute and prevent the occurrence of coal blockage faults, the flexible non-sticking anti-blocking coal chute completely subverts the rigid structure of the traditional coal chute in design. Instead, a flexible material is used as the working surface of the coal chute, and a knocking device is installed outside it. By knocking, the bottom surface of the coal chute continuously deforms convexly and concavely, causing the caked coal to break up. During the vibration process, the surface area of the bottom surface of the coal chute rapidly increases and recovers, resulting in a difference in the surface area in contact with the caking coal. Thus, the caking coal separates during the continuous convex and concave deformation of the bottom surface and then falls off from the bottom surface.

[0009] The technical solution of the present utility model is that the working surface of the coal chute is composed of a rigid layer, a flexible layer, a wear-resistant layer, and an anti-sticking layer. The rigid layer is responsible for providing the support required to resist the impact of the coal flow; the flexible layer is responsible for surface deformation and area expansion and contraction; the wear-resistant layer is used to improve the service life of the equipment and extend the maintenance cycle; the anti-sticking layer is a super-hydrophobic material sprayed on the wear-resistant layer, making its surface non-sticky and having the effects of anti-adhesion and self-cleaning. The thrust of the knocking device can reach more than 3800N, the action speed can reach 400mm / s, and the stroke can be adjusted at any time according to the caking coal situation, effectively ensuring the deformation requirements of the flexible layer. The knocking device has three control methods: manual control, automatic control, and remote control. Among them, manual control uses a manual switch or button to realize the expansion and contraction of the knocking device by controlling the forward and reverse rotation of the motor. This method is simple and flexible to operate and can adjust the knocking frequency and cycle in a timely manner according to the caking coal situation on the spot; automatic control realizes the automatic control of the movement of the knocking device by installing sensors and controllers. This method is suitable for linkage control with the coal conveying system. Remote control uses technologies such as PLC controllers, industrial networks, and human-machine interfaces to realize the cyclic control and remote operation of the knocking device. This method is suitable for coal conveying systems that implement program control and can realize remote monitoring and management.

[0010] Compared with the prior art, the present utility model has the following beneficial effects:

[0011] 1. Safe and efficient, and can achieve self-cleaning. Since this design effectively targets the caking of the coal chute for cleaning, it can completely achieve self-cleaning, making up for the deficiencies of other prevention and cleaning methods, avoiding the occurrence of coal blockage faults in the coal conveying system, and realizing the safe and stable operation of the coal conveying system.

[0012] 2. Modular design, convenient installation and quick maintenance. Due to the modular design, the labor required for installation is greatly reduced. At the same time, it also greatly facilitates the daily maintenance work such as the replacement of wear-resistant parts, with the advantages of small workload and low labor intensity.

[0013] 3. Elastically connected to the equipment, vibration-free and low-noise. All mating surfaces of this device are elastically sealed, which will not increase dust pollution. At the same time, it is vibration-free and will not generate extra noise.

[0014] 4. Wide range of applications, can be applied to various types of coal chutes. Whether it is a square coal chute, a circular coal chute, or a coal chute with an arc bottom surface, the transformation can be easily achieved. At the same time, it can also be adaptively designed for special parts such as the aggregate hopper of the screening and crushing equipment and the three-way baffle, ensuring that there is no coal adhesion and blockage in the whole process of the coal conveying system. Brief Description of the Drawings

[0015] Figure 1 Schematic diagrams of different working states of the flexible non-sticking and anti-blocking coal chute of the present utility model;

[0016] Figure 2 Exploded view of the overall structure of the flexible non-sticking and anti-blocking coal chute of the present utility model;

[0017] Figure 3 Schematic diagram of the usage state of the flexible non-sticking and anti-blocking coal chute of the present utility model.

[0018] In the figure: 1. Knocking device; 2. Flexible layer; 3. Coal adhered to the working surface; 4. Rigid layer; 5. Wear-resistant layer; 6. Coal chute; 7. Flange. Detailed Embodiment

[0019] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the specific embodiments.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "equipped with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] This flexible non-stick and anti-blocking coal chute includes a flexible working surface, a knocking device, a rigid support plate, wear-resistant patches and an anti-sticking coating. The wear-resistant patches are pasted on the flexible working surface. The rigid support plate is located below the flexible working surface and fixedly connected thereto. The anti-sticking coating is sprayed on the surface of the wear-resistant patches. The working surface, that is, the bottom surface for carrying materials, is made of flexible materials.

[0023] As Figure 3 shown, during the operation of the coal conveying system, the coal flow is sent from the upper belt conveyor to the lower belt conveyor through the coal chute. During the process of the coal flow sliding down along the bottom working surface of the coal chute, the fine coal powder contained in the coal will adhere to the bottom working surface of the coal chute more and more, and is continuously impacted by the coal flow and tamped, causing the coal adhered to the bottom working surface of the coal chute to gradually thicken.

[0024] As Figure 1 shown in the illustrated embodiment, by using the momentum generated by the rapid linear motion of the knocking device, the flexible working surface can realize surface convex and concave deformation and surface area expansion and contraction. The knocking device impacts the bottom working surface of the coal chute at a certain frequency and a certain period. When the knocking head extends outwards, it pushes the flexible working surface to bulge upwards, increasing its surface area. When the knocking head retracts, the flexible working surface concaves downwards under the action of the gravity of the coal flow, reducing its surface area. And during this process, the adhesion area of the adhered coal does not change, so that the adhered coal falls off from the working surface of the coal chute.

[0025] As Figure 2 shown in the illustrated embodiment, the wear-resistant layer is pasted on the flexible layer, the rigid layer is lined under the flexible layer, and is fixedly connected to the flexible layer around the installation flange. There is an opening in the middle of the rigid layer, and the knocking head of the knocking device knocks on the flexible layer through the opening part.

[0026] In the present utility model, the rigid layer, the flexible layer and the knocking device are all fixed on the flange and connected to the coal chute cylinder through the flange, without changing the position, shape of the original coal chute and its connection structure with other equipment. It can not only easily realize the connection and fixation with the original equipment, but also facilitate daily maintenance.

[0027] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. The flexible non-stick anti-blocking coal hopper includes a flexible working surface, a knocking device, a rigid support plate, a wear-resistant patch, and an anti-stick coating, and is characterized by: The wear-resistant patch is pasted on the flexible working surface, the rigid support plate is located below the flexible working surface and fixedly connected thereto, the anti-stick coating is sprayed on the surface of the wear-resistant patch, and the working surface, i.e. the bottom surface carrying the material, is made of flexible material.

2. The flexible non-stick anti-blocking coal chute according to claim 1 is characterized in that: The momentum generated by the rapid linear motion of the striking device is utilized to enable the flexible working surface to achieve surface convex-concave deformation and surface area expansion and contraction.

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