Abrasion-proof device of coal economizer

Abstract

The utility model relates to the technical field of coal economizers, in particular to an anti-abrasion device of a coal economizer, and aims to solve the technical problems that particles in smoke easily block comb-shaped anti-abrasion tiles, heat exchange between the smoke and a coal economizer pipeline can be hindered, and heat transfer is insufficient. Comprising a coal economizer shell, an air inlet pipe, a grate plate frame, grate rods, scraping rods, a rotating shaft, a driving mechanism, a hydraulic cylinder, a first gear, a second gear and a dust collecting chamber, the grate plate frame is matched with the grate rods, it is guaranteed that airflow can pass through smoothly, particles are prevented from directly impacting the pipe wall, and after gaps of the grate rods are blocked, the scraping rods are controlled to be inserted into the gaps of the grate rods and rotate towards the dust collecting chamber; particles on the upper portion and the lower portion of the grate rod enter the ash collecting chamber through holes of the economizer shell under the driving effect of the scraping rod, the particles are collected while gaps of the grate rod are dredged, and the problem that heat exchange between smoke and an economizer pipeline is hindered after the anti-abrasion tile is blocked is solved.

Description

Technical Field

[0001] This utility model relates to the field of economizer technology, specifically to an anti-wear device for an economizer. Background Technology

[0002] Economizers are typically located in the tail flue of a boiler, where the flue gas velocity is high and contains a large amount of fly ash particles. During boiler operation, the fly ash particles carried by the high-speed flue gas continuously erode the heat-receiving surfaces of the economizer. Over time, this leads to wear and thinning of the economizer tube walls. If leaks occur due to wear, it not only affects the normal operation of the boiler, reducing thermal efficiency and increasing energy consumption, but may also cause safety accidents, resulting in significant economic losses and safety hazards. Statistics show that economizer wear accounts for a considerable proportion of boiler malfunctions, seriously affecting the reliability and service life of the boiler.

[0003] Existing technology uses comb-shaped anti-wear tiles to prevent economizer wear. These tiles are generally made of materials such as wear-resistant alloy steel, heat-resistant steel, or wear-resistant ceramics. Designed with a comb-shaped structure, there are gaps between each tooth, allowing airflow to pass smoothly while preventing particles from directly impacting the tube wall. They are often installed in parts such as economizer suspension tubes and can effectively extend the service life of the economizer tube bundle.

[0004] However, particles in the flue gas can easily clog the comb-shaped anti-wear tiles. Once clogged, the comb-shaped anti-wear tiles will hinder the heat exchange between the flue gas and the economizer pipes, resulting in insufficient heat transfer and a decrease in the heat absorption capacity of the economizer. Utility Model Content

[0005] This invention addresses the technical problem that particles in flue gas easily clog comb-shaped anti-wear tiles, which, when clogged, hinder heat exchange between the flue gas and the economizer pipes, leading to insufficient heat transfer and a decrease in the economizer's heat absorption capacity. Therefore, this invention provides an anti-wear device for the economizer.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an anti-wear device for an economizer, comprising: an economizer shell, an air inlet pipe connected to the lower side wall of the economizer shell, a grate frame connected to the inner wall of the economizer shell above the air inlet pipe, a plurality of grate rods evenly distributed within the grate frame, the gap between adjacent grate rods being smaller than the particle diameter in the flue gas, scrapers located at the lower part of the grate frame and capable of being inserted into the gap between the grate rods, all scraper ends on the same side being connected to a rotating shaft, the shaft end of the rotating shaft being rotatably connected to the side wall of the economizer shell, a driving mechanism capable of driving the rotating shaft to rotate, holes being provided on both vertical side walls of the economizer shell, one end of the grate frame near the side wall being able to penetrate into the hole and communicate with the ash collection chamber, and to transport particles into the ash collection chamber.

[0007] Preferably, both the grate frame and the grate rod are inverted V-shaped.

[0008] Preferably, both the economizer shell and the bottom of the ash collection chamber are connected to a sealed door that can be opened and closed.

[0009] Preferably, the drive mechanism includes a hydraulic cylinder, the fixed end of which is hinged to the outer wall of the economizer housing, the telescopic end of which is hinged to the edge of gear one, the shaft end of gear one is rotatably connected to the outer wall of the economizer housing, gear one is meshed with gear two, gear one has more teeth than gear two, and gear two is connected to the shaft end of the rotating shaft.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. The grate frame and grate rods work together to ensure smooth airflow and prevent particles from directly impacting the pipe wall. When the gaps between the grate rods become blocked, the scraper is inserted into the gaps and rotated towards the ash collection chamber. Particles at the top and bottom of the grate rods are driven by the scraper and enter the ash collection chamber through the holes in the economizer shell. This clears the gaps between the grate rods and collects the particles, solving the problem that blockage of the anti-wear tiles would hinder heat exchange between the flue gas and the economizer pipes.

[0012] 2. The rotation of the scraper is controlled by the extension and retraction of the hydraulic cylinder, providing stable power for the scraper to start and stop at any time, and the scraper will not get stuck due to its strong dredging force. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0015] Figure 3 This utility model Figure 2 Enlarged structural diagram;

[0016] In the diagram: Economizer shell 1; Inlet pipe 2; Grate frame 3; Grate rod 4; Scraper 5; Rotating shaft 6; Drive mechanism 7; Hydraulic cylinder 71; Gear 1 72; Gear 2 73; Ash collection chamber 8. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The rotary connection described in this device refers to the axial fixation of the bearing by mounting the bearing on the shaft, with a spring retaining ring groove provided on the shaft or shaft hole, and the rotation achieved by locking the elastic retaining ring in the retaining ring groove; the hinge connection refers to the connection method that allows movement through connecting parts such as hinges, pins, and short shafts.

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] The following is in conjunction with the appendix Figure 1-3 This embodiment describes an anti-wear device for an economizer, comprising: an economizer housing 1; an air inlet pipe 2 connected to the lower side wall of the economizer housing 1; a grate frame 3 connected to the inner wall of the economizer housing 1 above the air inlet pipe 2; multiple grate rods 4 evenly distributed within the grate frame 3; the gap between adjacent grate rods 4 being smaller than the diameter of particles in the flue gas; scraper rods 5 located at the lower part of the grate frame 3 and capable of being inserted into the gaps between the grate rods 4; the ends of all scraper rods 5 on the same side being connected to a rotating shaft 6; the shaft end of the rotating shaft 6 being rotatably connected to the side wall of the economizer housing 1; a drive mechanism 7 capable of driving the rotating shaft 6 to rotate; holes being provided on both vertical side walls of the economizer housing 1; one end of the grate frame 3 near the side wall being able to penetrate into the hole and communicate with the ash collection chamber 8, and to transport particles into the ash collection chamber 8.

[0021] Flue gas is injected through inlet pipe 2, carrying particles upwards. At this time, scraper 5 is vertically positioned, and the particles cannot pass through the gaps in the grate bars 4, ensuring smooth airflow and preventing particles from directly impacting the pipe wall. When the gaps in the grate bars 4 become blocked, the drive mechanism 7 drives scraper 5 to insert into the gaps in the grate bars and rotate towards the ash collection chamber 8. Particles at the top and bottom of the grate bars 4 enter the ash collection chamber 8 through the holes in the economizer shell 1 under the action of the scraper, clearing the gaps in the grate bars 4 while collecting particles. This solves the problem that blockage of the anti-wear tiles would hinder heat exchange between the flue gas and the economizer pipes. Figure 2 The two scraper rods 5 are in the working state and the folded state respectively. When the scraper rod 5 is in the folded state, it remains vertical and will not affect the rise of flue gas particles.

[0022] Both the grate frame 3 and the grate rod 4 are inverted V-shaped.

[0023] The inverted V-shaped grate frame 3 and grate rod 4 allow the particles to roll off the inclined plane more effectively.

[0024] Both the economizer outer shell 1 and the bottom of the ash collection chamber 8 are connected to a sealing door 9 that can be opened and closed.

[0025] It facilitates the removal of accumulated dust.

[0026] The drive mechanism 7 includes a hydraulic cylinder 71. The fixed end of the hydraulic cylinder 71 is hinged to the outer wall of the economizer housing 1, and the telescopic end of the hydraulic cylinder 71 is hinged to the edge of gear 1 72. The shaft end of gear 1 72 is rotatably connected to the outer wall of the economizer housing 1. Gear 1 72 is meshed with gear 2 73. Gear 1 72 has more teeth than gear 2 73. Gear 2 73 is connected to the shaft end of the rotating shaft 6.

[0027] By controlling the extension and retraction of the hydraulic cylinder 71, the gear 72 is driven to rotate. The gear 72 drives the rotating shaft 6 to rotate through the gear 73, thereby clearing the gaps in the grate rod 4. Since the gear 72 has more teeth than the gear 73, the hydraulic cylinder 71 only needs a shorter stroke to drive the scraper rod 5 to move at a large angle.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-wear device for an economizer, comprising: Economizer housing (1), with an air inlet pipe (2) connected to the lower side wall of the economizer housing (1). The features are as follows: the inner wall of the economizer shell (1) above the air inlet pipe (2) is connected to a grate frame (3), and multiple grate rods (4) are evenly distributed in the grate frame (3). The gap between adjacent grate rods (4) is smaller than the particle diameter in the flue gas. The scraper rod (5) is located at the lower part of the grate frame (3) and can be inserted into the gap between the grate rods (4). The ends of all scraper rods (5) on the same side are connected to the rotating shaft (6). The shaft end of the rotating shaft (6) is rotatably connected to the side wall of the economizer shell (1). The driving mechanism (7) can drive the rotating shaft (6) to rotate. The two vertical side walls of the economizer shell (1) are provided with holes. The end of the grate frame (3) near the side wall can penetrate into the hole and communicate with the ash collection chamber (8) and transport the particles to the ash collection chamber (8).

2. The anti-wear device for an economizer according to claim 1, characterized in that: Both the grate frame (3) and the grate rod (4) are inverted V-shaped.

3. The anti-wear device for an economizer according to claim 1, characterized in that: The economizer shell (1) and the bottom of the ash collection chamber (8) are both connected to a sealing door (9) that can be opened and closed.

4. The anti-wear device for an economizer according to claim 1, characterized in that: The drive mechanism (7) includes a hydraulic cylinder (71), the fixed end of which is hinged to the outer wall of the economizer housing (1), the telescopic end of which is hinged to the edge of gear one (72), the shaft end of gear one (72) is rotatably connected to the outer wall of the economizer housing (1), gear one (72) is meshed with gear two (73), gear one (72) has more teeth than gear two (73), and gear two (73) is connected to the shaft end of the rotating shaft (6).

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