Abrasion-proof device for coal economizer

Abstract

The utility model provides a coal economizer anti-abrasion device which comprises a coal economizer, the coal economizer comprises a plurality of coal economizer pipe rows which are arranged side by side and sequentially communicated, and each coal economizer pipe row comprises a plurality of straight pipe sections and a plurality of U-shaped pipe sections; the first anti-abrasion covers are used for carrying out anti-abrasion on each straight pipe section, and the outer top wall of each straight pipe section is sleeved with one first anti-abrasion cover; and the second anti-abrasion covers are used for conducting anti-abrasion on each U-shaped pipe section, and the outer top wall and the inner bottom wall of each U-shaped pipe section are each sleeved with one second anti-abrasion cover. Abrasion resistance of each straight pipe section is achieved through the first abrasion-resistant cover, abrasion resistance of each U-shaped pipe section is achieved through the two second abrasion-resistant covers, flue gas is prevented from making direct contact with the pipe walls of the straight pipe sections and the pipe walls of the U-shaped pipe sections and scouring the straight pipe sections and the U-shaped pipe sections, the possibility that the straight pipe sections and the U-shaped pipe sections in the economizer pipe row are abraded is reduced, and the service life of the economizer pipe row is prolonged. Therefore, the service life of the economizer is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of economizers, and in particular to an anti-wear device for economizers. Background Art

[0002] An economizer is a device installed at the lower part of the tail flue of a boiler (for example, a fluidized bed boiler, which is a boiler using fluidized bed combustion) to recover the waste heat of the exhaust gas. It heats the boiler feed water into a heating surface of saturated water under drum pressure. Since it absorbs the heat of high-temperature flue gas, it reduces the exhaust temperature of the flue gas, saves energy and improves efficiency, so it is called an economizer. It is mainly suitable for industry, and is gradually becoming popular in agriculture and some related industries and businesses.

[0003] Fluidized bed boilers mainly use differential bed combustion technology and use low calorific value coal gangue as fuel to generate electricity. After the boiler flue gas exits the furnace outlet, it passes through the high-temperature superheater and the low-temperature superheater in sequence and then turns downward to enter the (high-temperature) economizer. When the flue gas passes through the economizer tube array from top to bottom, it exchanges heat with the water in the economizer tube array and also washes the economizer tube array, causing it to wear. Utility Model Content

[0004] The present application provides an economizer anti-wear device to solve the technical problems described in the above background technology.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] The present application provides an economizer anti-wear device, comprising:

[0007] An economizer, the economizer comprising a plurality of economizer tube banks arranged in parallel and connected in sequence, each of the economizer tube banks comprising a plurality of straight tube segments and a plurality of U-shaped tube segments;

[0008] A first anti-wear cover, which is used to protect each of the straight pipe sections from wear, and a first anti-wear cover is sleeved on the outer top wall of each of the straight pipe sections;

[0009] The second anti-wear cover is used to protect each of the U-shaped pipe sections from wear. The outer top wall and the inner bottom wall of each of the U-shaped pipe sections are respectively provided with a second anti-wear cover.

[0010] Optionally, each economizer tube bank is staggeredly provided with front anti-wear plates and rear anti-wear plates along its length direction.

[0011] Optionally, the thickness of the front anti-wear plate and the rear anti-wear plate is 2mm-5mm.

[0012] Optionally, the horizontal spacing between two adjacent front anti-wear plates and the rear anti-wear plates is 6 mm to 8 mm.

[0013] Optionally, the economizer, the front anti-wear plate and the rear anti-wear plate are all made of carbon steel.

[0014] Optionally, the length of each of the first anti-wear covers matches the length of each of the straight pipe sections, and the longitudinal cross-sections on both sides thereof are circular and semicircular, respectively.

[0015] Optionally, the length of each of the second anti-wear covers matches the length of the U-shaped pipe section, and the longitudinal cross-section thereof is arc-shaped.

[0016] Optionally, each of the first anti-wear covers and each of the second anti-wear covers are made of stainless steel.

[0017] Optionally, the bottom and top of the economizer are respectively connected to a water inlet box and a water outlet box.

[0018] The economizer anti-wear device provided in the present application has a boiler flue gas that passes through the high-temperature superheater and the low-temperature superheater in sequence after exiting the furnace outlet and then turns downward to enter the (high-temperature) economizer, that is, the flue gas contacts the economizer from top to bottom. Therefore, the present application sets a first anti-wear cover on the outer top wall of each straight pipe segment included in each economizer tube row of the economizer. Each straight pipe segment is protected by the first anti-wear cover to prevent the flue gas from scouring the straight pipe segment. At the same time, a second anti-wear cover is respectively set on the outer top wall and inner bottom wall of each U-shaped pipe segment included in each economizer tube row of the economizer. The two second anti-wear covers respectively protect the outer top wall and inner bottom wall of the U-shaped pipe segment to prevent the flue gas flowing in from top to bottom from scouring the U-shaped pipe segment. Therefore, the present application realizes the wear protection of each straight pipe segment through the first anti-wear cover, and realizes the wear protection of each U-shaped pipe segment through two second anti-wear covers, thereby avoiding direct contact of flue gas with the pipe walls of the straight pipe segments and the U-shaped pipe segments and causing erosion thereon, reducing the possibility of wear of the straight pipe segments and the U-shaped pipe segments in the economizer tube array, thereby extending the service life of the economizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic structural diagram of an economizer anti-wear device provided in one embodiment of the present application;

[0021] Figure 2 A schematic structural diagram of an economizer anti-wear device provided in another embodiment of the present application;

[0022] Figure 3 A schematic structural diagram of an economizer anti-wear device provided in another embodiment of the present application;

[0023] Figure 4 This is a schematic structural diagram of the first anti-wear cover provided in one embodiment of the present application.

[0024] In the figure: 100, economizer tube row; 101, straight pipe section; 102, U-shaped pipe section; 103, front anti-wear plate; 104, rear anti-wear plate; 200, first anti-wear cover; 300, second anti-wear cover; 400, water inlet tank; 500, water outlet tank; 600, pipe clamp. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0026] refer to Figures 1 to 4 The present application provides an economizer anti-wear device, comprising:

[0027] The economizer includes a plurality of economizer tube banks 100 arranged in parallel and connected in sequence. Each economizer tube bank 100 includes a plurality of straight tube segments 101 and a plurality of U-shaped tube segments 102. The economizer is secured and installed within the boiler using tube clamps 600. At least two tube clamps 600 are provided to improve its stability within the boiler. The number of tube clamps 600 can be set based on actual needs and is not specifically limited in this application. Furthermore, the number of economizer tube banks 100 and the number of straight tube segments 101 and U-shaped tube segments 102 included in each economizer tube bank 100 can be set based on actual needs and are not specifically limited in this application.

[0028] The first anti-wear cover 200 is used to protect each straight pipe segment 101 from wear. A first anti-wear cover 200 is sleeved on the outer top wall of each straight pipe segment 101; wherein, since the boiler flue gas passes through the high-temperature superheater and the low-temperature superheater in sequence after exiting the furnace outlet and then turns downward to enter the (high-temperature) economizer, that is, the flue gas contacts the economizer from top to bottom, therefore, the present application sleeves a first anti-wear cover 200 on the outer top wall of each straight pipe segment 101, and the straight pipe segment 101 is protected from wear by the first anti-wear cover 200, and the first anti-wear cover 200 can be connected to the corresponding straight pipe segment 101 by welding, and the present application does not further limit the connection method of the first anti-wear cover 200 and the straight pipe segment 101.

[0029] The second anti-wear cover 300 is used to protect each U-shaped pipe segment 102 from wear. A second anti-wear cover 300 is respectively mounted on the outer top wall and inner bottom wall of each U-shaped pipe segment 102; the two second anti-wear covers 300 are respectively mounted on the outer top wall and inner bottom wall of the U-shaped pipe segment 102 (the inner bottom wall here refers to the outer wall with the bottom facing upwards in the U-shaped portion of the U-shaped pipe segment 102). The two second anti-wear covers 300 are used to protect the outer top wall and inner bottom wall of the U-shaped pipe segment 102, respectively, to prevent the flue gas flowing in from top to bottom from eroding the U-shaped pipe segment 102. In addition, both second anti-wear covers 300 can be connected to the outer top wall and inner bottom wall of the U-shaped pipe segment 102 by welding. This application does not further limit the connection method of the second anti-wear covers 300 and the U-shaped pipe segment 102.

[0030] The economizer anti-wear device provided in the present application is equipped with a first anti-wear cover 200 on the outer top wall of each straight pipe segment 101 included in each economizer tube row 100 of the economizer. Each straight pipe segment 101 is protected by the first anti-wear cover 200 to prevent the flue gas diffused from top to bottom from scouring the straight pipe segment 101. A second anti-wear cover 300 is respectively mounted on the outer top wall and inner bottom wall of each U-shaped pipe segment 102 included in each economizer tube row 100 of the economizer. The outer top wall and inner bottom wall of the U-shaped pipe segment 102 are protected by two second anti-wear covers 300 to prevent the flue gas flowing in from top to bottom from scouring the U-shaped pipe segment 102. Therefore, the present application realizes the wear protection of each straight pipe segment 101 through the first anti-wear cover 200, and realizes the wear protection of each U-shaped pipe segment 102 through the two second anti-wear covers 300, thereby avoiding direct contact between the flue gas and the pipe walls of the straight pipe segments 101 and the U-shaped pipe segments 102 and causing erosion thereon, reducing the possibility of wear of the straight pipe segments 101 and the U-shaped pipe segments 102 in the economizer tube array 100, thereby extending the service life of the economizer.

[0031] In some embodiments, reference Figure 2In the present application, each economizer tube bank 100 is staggered with front anti-wear sheets 103 and rear anti-wear sheets 104 along its length. There are multiple front anti-wear sheets 103 and rear anti-wear sheets 104, and a vertical channel (a channel for flue gas circulation) is formed between every two adjacent front anti-wear sheets 103 and rear anti-wear sheets 104. The multiple front anti-wear sheets 103 and the multiple rear anti-wear sheets 104 form multiple vertical channels, which separate the flue gas flowing from top to bottom into multiple streams, thereby improving the contact efficiency between the flue gas and the economizer tube bank 100, and further improving the heat exchange efficiency between the flue gas and the water in the economizer tube bank 100. In addition, the provision of the front anti-wear sheets 103 and the rear anti-wear sheets 104 also prevents the flue gas from directly scouring the economizer tube bank 100, thereby improving the anti-wear efficiency of the economizer tube bank 100 and extending the service life of the economizer tube bank 100.

[0032] In some embodiments, the thickness of the front and rear anti-wear sheets 103 and 104 in the present application is 2 mm to 5 mm. This allows the heat transferred from the flue gas to the front and rear anti-wear sheets 103 and 104 after contact with the front and rear anti-wear sheets 103 and 104 to be quickly transferred to the economizer tube bank 100, thereby reducing wear on the economizer tube bank 100. The specific thickness of the front and rear anti-wear sheets 103 and 104 can be set according to actual needs and is not further limited in this application.

[0033] In some embodiments, the horizontal spacing between two adjacent front anti-wear plates 103 and rear anti-wear plates 104 in the present application is 6mm-8mm. The purpose is to improve the wear protection of the front anti-wear plates 103 and rear anti-wear plates 104 on the tube wall of the economizer tube row 100 while dividing the flue gas passing through the outer tube wall of the economizer tube row 100 into multiple streams. The horizontal spacing between the above-mentioned two adjacent front anti-wear plates 103 and rear anti-wear plates 104 can be specifically set according to actual conditions. Therefore, this application does not make further limitations on it here.

[0034] In some embodiments, the economizer tube bank 100, the front anti-wear sheets 103, and the rear anti-wear sheets 104 in the present application are all made of carbon steel. Carbon steel has the characteristics of high strength, good wear resistance, and strong plasticity. The front anti-wear sheets 103 and the rear anti-wear sheets 104 are made of the same material as the economizer tube bank 100. This allows the heat transferred from the flue gas to the front anti-wear sheets 103 and the rear anti-wear sheets 104 to be quickly transferred to the economizer tube bank 100 after the front anti-wear sheets 103 and the rear anti-wear sheets 104 come into contact with the flue gas, thereby rapidly heating the water in the economizer tube bank 100.

[0035] In some embodiments, reference Figure 4The length of each first anti-wear cover 200 in the present application matches the length of each straight pipe segment 101, and the longitudinal cross-sections on both sides thereof are circular and semicircular, respectively. In this way, the first anti-wear cover 200 can better protect the outer top wall of the straight pipe segment 101, effectively realizing the anti-wear of each straight pipe segment 101, thereby improving the anti-wear efficiency of the straight pipe segment 101.

[0036] In some embodiments, the length of each second anti-wear cover 300 in the present application matches the length of the U-shaped pipe segment 102, and its longitudinal cross-section is arc-shaped, so that the two second anti-wear covers 300 can better protect the outer top wall and inner bottom wall of the U-shaped pipe segment 102 respectively, effectively realizing the anti-wear of each U-shaped pipe segment 102, thereby improving the anti-wear efficiency of the U-shaped pipe segment 102.

[0037] In some embodiments, each first anti-wear cover 200 and each second anti-wear cover 300 in the present application are made of stainless steel. Stainless steel has advantages such as good corrosion resistance and toughness, which results in a long service life for the first anti-wear cover 200 and the second anti-wear cover 300. Stainless steel can be ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, etc., and can be selected based on actual needs. Therefore, this application does not further limit this.

[0038] In some embodiments, reference Figure 3 In the present application, the bottom and top of the economizer tube bank 100 are connected to a water inlet tank 400 and a water outlet tank 500, respectively. Since the boiler flue gas passes through the high-temperature superheater and the low-temperature superheater in sequence after exiting the furnace outlet before turning downward to enter the (high-temperature) economizer, the flue gas contacts the economizer tube bank 100 from top to bottom. In the above embodiment, the bottom of the economizer tube bank 100 is connected to the water inlet tank 400, and the top of the economizer tube bank 100 is connected to the water outlet tank 500. In other words, water flows from bottom to top within the economizer tube bank, i.e., the water and the flue gas are in countercurrent flow. During the circulation process, the water fully exchanges heat with the countercurrent flue gas, effectively utilizing the heat of the flue gas and heating the water into steam before entering the boiler drum.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An economizer anti-wear device, characterized in that: include: An economizer, the economizer comprising a plurality of economizer tube banks (100) arranged in parallel and connected in sequence, each economizer tube bank (100) comprising a plurality of straight tube segments (101) and a plurality of U-shaped tube segments (102); A first anti-wear cover (200), the first anti-wear cover (200) being used to protect each of the straight pipe sections (101) from wear, and a first anti-wear cover (200) is sleeved on the outer top wall of each of the straight pipe sections (101); A second anti-wear cover (300) is used to protect each of the U-shaped pipe sections (102) from wear. The outer top wall and the inner bottom wall of each of the U-shaped pipe sections (102) are respectively provided with a second anti-wear cover.

2. The economizer anti-wear device according to claim 1, characterized in that: Each economizer tube bank (100) is staggeredly provided with front anti-wear plates (103) and rear anti-wear plates (104) along its length direction.

3. The economizer anti-wear device according to claim 2, characterized in that: The thickness of the front anti-wear plate (103) and the rear anti-wear plate (104) is 2 mm to 5 mm.

4. The economizer anti-wear device according to claim 2, characterized in that: The horizontal spacing between two adjacent front anti-wear plates (103) and the rear anti-wear plates (104) is 6 mm to 8 mm.

5. The economizer anti-wear device according to claim 2, characterized in that: The economizer, the front anti-wear plate (103) and the rear anti-wear plate (104) are all made of carbon steel.

6. The economizer anti-wear device according to claim 1, characterized in that: The length of each of the first anti-wear covers (200) matches the length of each of the straight pipe sections (101), and the longitudinal sections on both sides thereof are circular and semicircular, respectively.

7. The economizer anti-wear device according to claim 1, characterized in that: The length of each second anti-wear cover (300) matches the length of the U-shaped pipe section (102), and its longitudinal section is arc-shaped.

8. The economizer anti-wear device according to any one of claims 1 to 7, characterized in that: Each of the first anti-wear covers (200) and each of the second anti-wear covers (300) are made of stainless steel.

9. The economizer anti-wear device according to any one of claims 1 to 7, characterized in that: The bottom and top of the economizer tube bank (100) are respectively connected to a water inlet box (400) and a water outlet box (500).

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