Anti-wear device for boiler tube bank, its use and installation method

Abstract

The present application provides a wear-proof device for a boiler tube bank, its use and its installation method, including: a plurality of first wear-proof boxes are respectively sleeved on the U-shaped tube banks of the boiler tube banks; the boiler tube banks that penetrate the furnace wall and are located on both sides of the furnace wall are respectively provided with a through-wall tube bank wear-proof assembly, and the through-wall tube bank wear-proof assembly is used to prevent the boiler tube banks that penetrate the furnace wall from being worn; each through-wall tube bank wear-proof assembly includes a plurality of second wear-proof boxes with openings at both ends, a plurality of T-shaped connecting plates and two blocking plates; a second wear-proof box is sleeved on each boiler tube bank that penetrates the furnace wall; the T-shaped connecting plate is vertically arranged between two adjacent second wear-proof boxes, and a blocking plate is arranged on the top and bottom surfaces of the boiler tube banks on the same side of the furnace wall, and the blocking plate is perpendicular to the furnace wall and one side thereof abuts against the surface of the furnace wall. The present application reduces the wear rate of the U-shaped tube banks of the boiler tube banks and the boiler tube banks that penetrate the furnace wall, and increases the service life of the boiler tube banks.

Description

Technical Field

[0001] The present application relates to boiler anti-wear technology, and in particular to an anti-wear device for a boiler tube bank, its use and its installation method. Background Art

[0002] Thermal power plants are currently one of the most important power supply locations in my country. Boilers are one of the most important equipment in thermal power plants, and the stability of their operation plays a vital role in the stable operation of power plants. However, in the actual operation of thermal power plant boilers, various faults occur from time to time; it can even be said that the boiler is the cause of most of the various accidents in thermal power plants, among which the failure of the boiler heating surface is an important cause of boiler accidents. Therefore, power plants pay more and more attention to the problem of boiler heating surface failure. How to effectively prevent the failure of the boiler heating surface is of great practical significance.

[0003] The boiler heat exchange surface mainly refers to the boiler's water-cooled wall, superheater, economizer, reheater and other flue gas heat exchangers. The flue gas heat exchanger is mainly composed of heat exchange tubes of various diameters, with flue gas on the outside, which transfers heat to the high-pressure gas-water medium flowing inside through radiation or convection. Once a thermal power plant has a leak in the heating surface, the shutdown and emergency repair measures will seriously affect the normal power generation of the power plant and cause certain economic losses. The leaking heat exchanger will be isolated, and the flue gas will pass through the flue normally. The water leaked in the flue will mix with the flue gas, causing the heat exchanger to rust, accelerate the damage of the heat exchanger, and also cause corresponding economic losses. In addition, the water leaked from the heat exchanger also has different degrees of adverse effects on air preheaters, electrostatic precipitators, induced draft fans and other equipment. The wear and leakage of the heat exchanger found so far mainly occurs on the heat exchange tubes on the smoke-facing side of the heat exchanger.

[0004] The existing boiler anti-wear device usually adopts the method of installing anti-wear tiles on the tube banks of the primary reheater and economizer one by one to avoid damage to the heating surface of the tube banks. However, due to the layout restrictions of the primary reheater and economizer tube banks, the construction workload of installing anti-wear tiles on the tube banks one by one is huge. The hidden danger pipes found during the inspection are mostly located in the wall-penetrating pipes and the middle tube banks. The installation one by one requires the tube banks to be cut open one by one, which makes the construction difficult. Summary of the invention

[0005] The present application provides a wear-proof device for a boiler tube bank, its use and its installation method, so as to solve the problem that the existing wear-proof device for a boiler usually adopts the method of installing wear-proof tiles on the tube banks of a primary reheater and an economizer one by one to avoid damage to the heating surface of the tube banks. However, due to the arrangement restrictions of the tube banks of the primary reheater and the economizer, the construction workload of installing wear-proof tiles on the tube banks one by one is huge, and the hidden danger pipes found during inspection are mostly located in the through-wall pipes and the middle tube banks. The installation one by one requires the tube banks to be cut open one by one for implementation, which makes the construction difficult.

[0006] In order to solve the above technical problems, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a wear-proof device for a boiler tube bank, comprising a plurality of first wear-proof boxes and a plurality of through-wall tube bank wear-proof components;

[0008] A plurality of the first anti-wear boxes are respectively sleeved on the U-shaped tube banks of the boiler tube banks, and are used to prevent the U-shaped tube banks in the boiler tube banks from being worn;

[0009] The boiler tube row penetrates the furnace wall and is located on both sides of the furnace wall. Each of the boiler tube rows is provided with a through-the-wall tube row anti-wear component, and the through-the-wall tube row anti-wear component is used to prevent the boiler tube row penetrating the furnace wall from being worn;

[0010] Each of the wall-penetrating pipe row anti-wear components includes a plurality of second anti-wear boxes with openings at both ends, a plurality of T-shaped connecting plates and two blocking plates; a second anti-wear box is mounted on each of the boiler pipe rows penetrating the furnace wall; the T-shaped connecting plate is vertically arranged between two adjacent second anti-wear boxes, and is used to connect the two adjacent second anti-wear boxes together; a blocking plate is arranged on the top and bottom surfaces of the boiler pipe rows on the same side of the furnace wall; the blocking plate is perpendicular to the furnace wall and one side thereof abuts against the surface of the furnace wall.

[0011] Optionally, the wall-penetrating pipe row anti-wear assembly further includes two sealing plates;

[0012] The two sealing plates are respectively arranged at the top and bottom of the boiler tube row penetrating the furnace wall. Each sealing plate, the furnace wall, the baffle plate and the second anti-wear box form a closed space, and the closed space is filled with sealing material.

[0013] Optionally, an anti-wear layer is provided on the outer surfaces of the first anti-wear box, the second anti-wear box, the T-shaped connecting plate, the blocking plate and the sealing plate.

[0014] Optionally, the anti-wear layer is a ceramic-rubber composite wear-resistant plate.

[0015] Optionally, each of the baffle plates is provided with a plurality of U-shaped grooves at equal intervals along its length direction, and the notches of the plurality of U-shaped grooves are fixed to the furnace wall.

[0016] Optionally, a flue gas flow equalizing plate is also included;

[0017] The flue gas flow equalizing plate is perpendicular to the flue gas flow direction and one side of the flue gas flow equalizing plate is fixed to the furnace wall; a plurality of flow equalizing holes are evenly spaced on the flue gas flow equalizing plate, and the plurality of flow equalizing holes are used to disperse the flue gas flowing through the flue gas flow equalizing plate.

[0018] Optionally, the first anti-wear box, the second anti-wear box, the T-shaped connecting plate, the blocking plate and the sealing plate are all made of stainless steel.

[0019] In a second aspect, the present application provides a use of an anti-wear device for a boiler tube bank, such as the anti-wear device described in any one of the above, which is used for a boiler primary economizer or a boiler reheater including the boiler tube bank.

[0020] In a third aspect, the present application provides a method for installing an anti-wear device for a boiler tube bank, which is used for a boiler reheater as described above and installed in a boiler furnace, and the installation method comprises:

[0021] Cut off the water-cooled wall in the front wall area and the water-cooled wall in the rear wall area of ​​the furnace wall, and use a fall chain to pull the U-shaped tube bank away from the through-wall tube bank in the boiler tube bank;

[0022] A second anti-wear box is sleeved on each tube row of the boiler reheater penetrating the water-cooled wall, a T-shaped connecting plate is welded between each two adjacent second anti-wear boxes, and the U-shaped groove on the baffle plate is welded to the water-cooled wall;

[0023] Filling sealing material in the gap between the water-cooled wall, the baffle plate and the second anti-wear box, and welding the sealing plate between the side of the baffle plate away from the furnace wall and the surface of the second anti-wear box;

[0024] Installing the first anti-wear box at the U-shaped tube bank of the boiler reheater in the front wall area and the rear wall area of ​​the furnace wall;

[0025] The cut water-cooled wall is reinstalled on the furnace wall.

[0026] In a fourth aspect, the present application provides a method for installing an anti-wear device for a boiler tube bank, which is used for a primary economizer as described above that has been installed in a boiler furnace, and the installation method comprises:

[0027] Cut off the water-cooled wall in the front wall area of ​​the furnace wall, and use a fall chain to pull the U-shaped tube bank away from the through-wall tube bank in the boiler tube bank;

[0028] A second anti-wear box is sleeved on each tube row of the first-stage economizer penetrating the water-cooled wall, a T-shaped connecting plate is welded between each two adjacent second anti-wear boxes, and the U-shaped groove on the baffle plate is welded to the water-cooled wall;

[0029] Filling sealing material in the gap between the water-cooled wall, the baffle plate and the second anti-wear box, and welding the sealing plate between the side of the baffle plate away from the furnace wall and the surface of the second anti-wear box;

[0030] Install the first anti-wear box at the U-shaped tube bank of the primary economizer located in the front wall area and the rear wall area of ​​the furnace wall;

[0031] The cut water-cooled wall is reinstalled on the furnace wall.

[0032] The anti-wear device for the boiler tube bank provided by the present application sets the first anti-wear box on the U-shaped tube bank of the boiler tube bank, so that the flue gas directly scours the outer surface of the first anti-wear box, avoiding direct contact between the flue gas and the U-shaped tube bank of the boiler tube bank. The first anti-wear box prevents the flue gas from scouring the U-shaped tube bank of the boiler tube bank, avoiding wear on the U-shaped tube bank of the boiler tube bank, thereby reducing the wear rate of the U-shaped tube bank of the boiler tube bank and increasing the service life of the U-shaped boiler tube bank. In addition, a second anti-wear component is respectively installed on the boiler tube bank that passes through the furnace wall and is located on both sides of the furnace wall. A second anti-wear box is sleeved on each boiler tube row, and a T-shaped connecting plate is vertically installed between every two adjacent second anti-wear boxes. The T-shaped connecting plate fixes the two adjacent second anti-wear boxes together, and a blocking plate is respectively arranged on the top and bottom surfaces of the boiler tube row on the same side of the furnace wall. In this way, direct contact between the tube row where the boiler tube row passes through the furnace wall and the flue gas is avoided, and the flue gas is prevented from scouring the boiler tube row passing through the furnace wall, thereby increasing the wear rate of the boiler tube row passing through the furnace wall, increasing the service life of the boiler tube row, and ensuring the normal operation of the boiler. The installation of the first anti-wear box and the second anti-wear assembly is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 paying any creative work.

[0034] Figure 1 A schematic structural diagram of an anti-wear device for a boiler tube bank for a thermal power plant provided in one embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of the second anti-wear assembly after installation provided by an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the structure of various components of the second anti-wear assembly before installation provided in one embodiment of the present application;

[0037] Figure 4 A schematic diagram of the structure of a U-shaped tube bank and a wall-penetrating tube bank on a boiler reheater provided in one embodiment of the present application;

[0038] Figure 5 A schematic diagram of the structure of a U-shaped tube bank and a through-wall tube bank on a primary economizer provided in one embodiment of the present application.

[0039] In the figure: 100, boiler tube row; 101, U-shaped tube row; 200, first anti-wear box; 300, through-wall tube row anti-wear assembly; 301, second anti-wear box; 302, sealing plate; 303, barrier plate; 3031, U-shaped groove; 304, T-shaped connecting plate; 305, flue gas equalizing plate; 3051, equalizing hole; 400, furnace wall. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0041] The wear mechanism of the heating surface of the boiler tube bank 100 is as follows:

[0042] The fly ash wear of the boiler heating surface is caused by the kinetic energy of the fly ash particles carried by the high-temperature flue gas. When the fly ash particles impact the boiler heating surface, they consume the kinetic energy and produce an impact and cutting effect on the boiler heating surface. That is, the fly ash in the boiler flue gas has sufficient hardness and kinetic energy at a certain temperature, causing a grinding effect on the boiler heating surface.

[0043] The microscopic description can explain the wear process more intuitively and clearly. Wear is divided into two basic types, one is called erosion wear and the other is called impact wear.

[0044] Specifically, scouring wear is when the impact angle of the particle relative to the solid surface is small, or even close to parallel. The velocity component of the particle perpendicular to the solid surface makes it wedge into the impacted object, while the velocity component of the particle tangent to the solid surface makes it slide along the surface of the object. The combined effect of the two velocity components is a kind of planing. If the impacted object cannot withstand this effect, a small piece will be cut off. After a large number of repeated effects, the solid surface will be worn.

[0045] Impact wear refers to the wear caused by particles hitting the solid surface at a large impact angle or close to vertical with respect to the solid surface at a certain speed, causing tiny plastic deformation or micro cracks. Under long-term, large-scale repeated impacts of particles, the entire plastic deformation layer gradually falls off. Generally, in the wear of boiler heating surfaces, the impact angle between coal ash particles and the heating surface is between 0-90°.

[0046] In summary, the wear of the boiler heating surface is the comprehensive result of the above two basic types of wear.

[0047] Specific reference Figures 1 to 3 In a first aspect, the present application provides an anti-wear device for a boiler tube bank, comprising a plurality of first anti-wear boxes 200 and a plurality of through-wall tube bank anti-wear assemblies 300; wherein the boiler tube bank 100 comprises a U-shaped tube bank 101 and a through-wall tube bank. A plurality of first anti-wear boxes 200 are respectively mounted on the U-shaped tube row 101 of the boiler tube row 100 to prevent wear at the U-shaped tube row 101 of the boiler tube row 100. The open end of the first anti-wear box 200 matches the U-shaped tube row 101 of the boiler tube row 100. The open end of the first anti-wear box 200 is mounted on the U-shaped tube row 101 of the boiler tube row 100, so that the flue gas directly scours the outer surface of the first anti-wear box 200, thereby preventing the flue gas from directly contacting the U-shaped tube row 101 of the boiler tube row 100. The first anti-wear box 200 prevents the flue gas from scouring the U-shaped tube row 101 of the boiler tube row 100, thereby preventing wear at the U-shaped tube row 101 of the boiler tube row 100, thereby reducing the wear rate of the U-shaped tube row 101 of the boiler tube row 100 and increasing the service life of the U-shaped tube row 101 of the boiler tube row 100.

[0048] The boiler tube row 100 passes through the furnace wall 400, and a through-wall tube row anti-wear assembly 300 is respectively arranged on the boiler tube row 100 located on both sides of the furnace wall 400. The through-wall tube row anti-wear assembly 300 is used to prevent the boiler tube row 100 passing through the furnace wall 400 from being worn; specifically, each through-wall tube row anti-wear assembly 300 includes a plurality of second anti-wear boxes 301 with openings at both ends, a plurality of T-shaped connecting plates 304 and two blocking plates 303; a second anti-wear box 301 is sleeved on each boiler tube row 100 passing through the furnace wall 400; the T-shaped connecting plate 304 is vertically arranged between two adjacent second anti-wear boxes 301 The spacer 303 is used to connect two adjacent second anti-wear boxes 301 together. The top and bottom surfaces of the boiler tube row 100 located on the same side of the furnace wall 400 are each provided with a baffle plate 303. The baffle plate 303 is perpendicular to the furnace wall 400 and one side thereof abuts against the surface of the furnace wall 400. This avoids direct contact between the boiler tube row 100 passing through the furnace wall 400 and the flue gas, thereby preventing the flue gas from scouring the boiler tube row 100 passing through the furnace wall 400, thereby increasing the wear rate of the boiler tube row 100 passing through the furnace wall 400 and increasing the service life of the boiler tube row 100 passing through the furnace wall 400.

[0049] The anti-wear device of the boiler tube bank in the present application prevents the flue gas from scouring and causing wear to the U-shaped tube bank 101 of the boiler tube bank 100 and the boiler tube banks 100 that penetrate the furnace wall 400 and are located on both sides of the furnace wall 400, thereby extending the service life of the boiler tube bank 100 and ensuring the normal operation of the boiler. The installation of the first anti-wear box 200 and the wall-penetrating tube bank anti-wear assembly 300 is relatively simple.

[0050] The boiler tube row 100 in this application is Figure 2 Take the three boiler tube rows 100 as an example, wherein each boiler tube row 100 has five tubes as an example, each tube has a wall-penetrating tube portion and a U-shaped bend tube portion, the wall-penetrating tube portions of the five tubes form a wall-penetrating tube row, and the U-shaped bend tube portions of the five tubes form a U-shaped tube row 101.

[0051] In some embodiments, the wall-penetrating tube row anti-wear assembly 300 in the present application also includes two sealing plates 302; specifically, the two sealing plates 302 are respectively arranged at the top and bottom of the boiler tube row 100 that passes through the furnace wall 400, and each sealing plate 302 is combined with the furnace wall 400, the barrier plate 303 and the second anti-wear box 301 to form an enclosed space, and the enclosed space is filled with sealing material.

[0052] In the above embodiment, the sealed space and the sealing material filled in the sealed space can prevent smoke from flowing into the gap between the baffle plate 303, the second anti-wear box 301 and the sealing plate 302, and cause scouring to the gap between the baffle plate 303, the second anti-wear box 301 and the sealing plate 302, thereby extending the service life of the baffle plate 303, the second anti-wear box 301 and the sealing plate 302. In addition, the sealing material can be an aluminum silicate insulation material, wherein the aluminum silicate insulation material is also known as (aluminum silicate composite insulation coating), which is a new type of environmentally friendly wall insulation material, meets national building standards, and is a necessary material for many real estate developers, engineering contractors, and decoration engineering companies. Aluminum silicate composite thermal insulation coating is a new type of green inorganic single-component packaged dry powder thermal insulation coating made of natural brazing fiber as the main raw material and a certain amount of inorganic auxiliary materials through composite processing. Before construction, the thermal insulation coating is mixed with water and then scraped on the surface of the wall to be insulated. After drying, it can form a microporous mesh with a high-strength structure of thermal insulation layer, which has the advantages of green and harmless, water-absorbing and flame-retardant, and stable sealing. Therefore, the sealing material further increases the service life of the boiler tube row 100 and improves the operating efficiency of the thermal power generation.

[0053] In some embodiments, the outer surfaces of the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302 in the present application are all provided with an anti-wear layer, wherein the anti-wear layer can protect the outer surface of the first anti-wear box 200, the outer surface of the second anti-wear box 301, the surface of the T-shaped connecting plate 304, the surface of the baffle plate 303 and the surface of the sealing plate 302, and can prevent the smoke from directly causing impact to the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302. The brushing reduces the direct scouring of the flue gas on the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302, thereby reducing the wear of the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302 caused by the flue gas scouring, increasing the service life of the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302, and improving the service life of the boiler tube row 100, thereby ensuring the normal operation of the thermal power plant.

[0054] In some embodiments, the wear-resistant layer in the present application is a ceramic-rubber composite wear-resistant plate. Specifically, the ceramic and rubber themselves have high temperature resistance, and the rubber has good elasticity, that is, it has good buffering performance. The ceramic-rubber composite wear-resistant plate is a wear-resistant ceramic embedded in a special rubber to form a wear-resistant ceramic rubber lining, and then the wear-resistant ceramic rubber lining is fixed on the outer surface of the first wear-resistant box 200, the second wear-resistant box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302 by a high-strength organic adhesive to form a strong and buffering wear-resistant layer, which can protect the first wear-resistant box 200, the second wear-resistant box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302, thereby further increasing the service life of the boiler tube row 100.

[0055] In some embodiments, each baffle plate 303 in the present application is provided with a plurality of U-shaped grooves 3031 at equal intervals along its length direction, and the notches of the plurality of U-shaped grooves 3031 are fixed on the furnace wall 400. When installing the second anti-wear component 300, it is necessary to cut the water-cooled wall where the boiler tube row 100 passes through the furnace wall 400. Since there is a certain gap between each adjacent group of boiler tube rows 100, the furnace wall between each adjacent group of boiler tube rows 100 is not cut in the process of cutting the furnace wall 400. Compared with the boiler tube row 100, the area after the furnace wall 400 is cut through has a protrusion, and the protrusion matches the U-shaped groove 3031 opened on the baffle plate 303, so that during the installation of the second anti-wear component 300, the U-shaped groove 3031 in the baffle plate 303 can be clamped together with the protrusion on the furnace wall 400, thereby firmly fixing the baffle plate 303 on the furnace wall 400, ensuring that the baffle plate 303 can effectively play the role of blocking smoke.

[0056] In some embodiments, the anti-wear device of the boiler tube row in the present application also includes a flue gas flow equalizing plate 305, wherein the flue gas flow equalizing plate 305 can equalize the flow of flue gas passing through the through-wall tube row anti-wear assembly 300, thereby reducing the scouring force of the flue gas on the surface of the second anti-wear box 301, T-shaped connecting plate 304, barrier plate 303 and sealing plate 302 in the through-wall tube row anti-wear assembly 300.

[0057] The flue gas flow equalizing plate 305 is perpendicular to the direction of flue gas flow and one side of the flue gas flow equalizing plate 305 is fixed on the furnace wall 400; a plurality of flow equalizing holes 3051 are arranged at equal intervals on the flue gas flow equalizing plate 305, and the plurality of flow equalizing holes 3051 are used to disperse the flue gas flowing through the flue gas flow equalizing plate 305, wherein the plurality of flow equalizing holes 3051 on the flue gas flow equalizing plate 305 can reduce the passage area of ​​the flue gas, so that the flue gas passes through the flue gas flow equalizing plate 305 more evenly, thereby greatly reducing the difference in flue gas flow velocity in the boiler, reducing the scouring force of the flue gas on the surface of the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302, and slowing down the wear rate of the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302.

[0058] In some embodiments, the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302 in the present application are all made of stainless steel, wherein stainless steel is a steel with stainlessness and corrosion resistance as the main characteristics, and a chromium content of at least 10.5% and a maximum carbon content of no more than 1.2%. Among them, stainless steel is divided into: martensitic steel, ferritic steel, austenitic steel, austenitic-ferritic (duplex) stainless steel and precipitation hardening stainless steel and other forms. In actual use, any of the above stainless steel materials can be customized according to actual needs. Therefore, the present application does not further limit the specific types of stainless steel.

[0059] In the above embodiment, the stainless steel material improves the ability of the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302 to resist flue gas erosion, and improves the service life of the first anti-wear box 200, the second anti-wear box 301, the T-shaped connecting plate 304, the baffle plate 303 and the sealing plate 302, thereby improving the service life of the U-shaped tube row 101 of the boiler tube row 100 and the boiler tube row 100 located on both sides of the furnace wall 400, thereby ensuring the normal operation of the thermal power plant.

[0060] In a second aspect, the present application provides a use of a wear-proof device for a boiler tube bank, such as any of the wear-proof devices described above, which is used for a primary economizer or reheater including a boiler tube bank 100. The economizer is a device installed at the lower part of the flue at the tail end of the boiler to recover the waste heat of the exhaust gas, and is a heating surface that heats the boiler feed water into 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.

[0061] The first-stage economizer is in the low-temperature flue gas area; the reheater is essentially a steam superheater that reheats the low-pressure steam that has done work to a certain temperature. The role of the reheater further improves the thermal efficiency of the power plant cycle and controls the steam temperature of the last-stage blades of the steam turbine within the allowable range. The reheater is a heater in the boiler that heats the water vapor coming out of the steam turbine into superheated steam. The reheater has two functions: one is to reduce the humidity of the water vapor, which is beneficial to protect the turbine blades; the other is to improve the relative internal efficiency and absolute internal efficiency of the steam turbine.

[0062] In a third aspect, the present application provides a boiler tube bank anti-wear system, comprising: an anti-wear device as described in any one of the above, and a primary economizer or reheater including the boiler tube bank 100 .

[0063] Applying the anti-wear device disclosed in the present application to the primary economizer and the reheater can effectively alleviate the wear of the U-shaped tube row of the primary economizer and the tube row that penetrates the wall, and the wear of the U-shaped tube row of the reheater and the tube row that penetrates the wall, thereby increasing the service life of the primary economizer and the reheater and ensuring the normal operation of the thermal power plant.

[0064] refer to Figure 4 In a fourth aspect, the present application provides a method for installing an anti-wear device for a boiler tube bank, which is used for a boiler reheater such as the above-mentioned one installed in a boiler furnace, and the installation method comprises:

[0065] Cut off the water-cooled wall in the front wall area and the water-cooled wall in the rear wall area of ​​the furnace wall 400, and use a fall chain to pull the U-shaped tube bank away from the through-wall tube bank in the boiler tube bank 100;

[0066] A second anti-wear box 301 is sleeved on each tube row of the boiler reheater penetrating the water-cooled wall, a T-shaped connecting plate 304 is welded between each two adjacent second anti-wear boxes 301, and the U-shaped groove 3031 on the baffle plate 303 is welded to the water-cooled wall;

[0067] Fill the gap between the water-cooled wall, the baffle plate 303 and the second anti-wear box 301 with sealing material, and weld the sealing plate 302 between the side of the baffle plate 303 away from the furnace wall 400 and the surface of the second anti-wear box 301, wherein the second anti-wear box 301 can be fixed to the boiler tube row 100 of the boiler reheater on both sides of the furnace wall 400 by welding, and the baffle plate 303 can also be welded to the furnace wall 400 and the boiler tube row 100 by welding, and the sealing plate 302 is fixed to the baffle plate 303 and the second anti-wear box 301 by welding.

[0068] A first anti-wear box 200 is installed at the U-shaped tube bank of the boiler reheater in the front wall area and the rear wall area of ​​the furnace wall 400, wherein the first anti-wear box 200 can be fixed to the U-shaped tube bank on the boiler reheater by welding.

[0069] Reinstall the cut water-cooled wall to the furnace wall.

[0070] The above-mentioned installation method only requires cutting the furnace wall 400, pulling apart the U-shaped tube row of the boiler reheater through a fall chain, and then installing the first anti-wear box 200 at the U-shaped tube row on the boiler reheater, and then installing the second anti-wear box 301, T-shaped connecting plate 304, baffle plate 303, and sealing plate 302 on the boiler tube row 101 on the boiler reheater located on both sides of the furnace wall 400. The installation method is simple, and the installed first anti-wear box 200, second anti-wear box 301, T-shaped connecting plate 304, baffle plate 303, and sealing plate 302 can effectively prevent flue gas from scouring the U-shaped tube row on the boiler reheater and the boiler tube row 100 on the boiler reheater located on both sides of the furnace wall 400, causing wear thereof, thereby increasing the service life of the boiler reheater.

[0071] refer to Figure 5 In a fifth aspect, the present application provides a method for installing an anti-wear device for a boiler tube bank, which is used for a primary economizer such as the above-mentioned one installed in a boiler furnace, and the installation method comprises:

[0072] Cut off the water-cooled wall in the front wall area of ​​the furnace wall 400, and use a fall chain to pull the U-shaped tube bank away from the through-wall tubes in the boiler tube bank 100;

[0073] A second anti-wear box 301 is sleeved on each tube row of the first-stage economizer penetrating the water-cooled wall, a T-shaped connecting plate 304 is welded between each two adjacent second anti-wear boxes 301, and the U-shaped groove 3031 on the baffle plate 303 is welded to the water-cooled wall;

[0074] Fill the gap between the water-cooled wall, the baffle plate 303 and the second anti-wear box 301 with sealing material, and weld the sealing plate 302 between the side of the baffle plate away from the furnace wall 400 and the surface of the second anti-wear box 301, wherein the second anti-wear box 301 can be fixed to the boiler tube row 100 on both sides of the furnace wall 400 of the first-level economizer by welding, the baffle plate 303 can also be welded to the furnace wall 400 and the boiler tube row 100 by welding, and the sealing plate 302 is fixed to the baffle plate 303 and the second anti-wear box 301 by welding.

[0075] The first anti-wear box 200 is installed at the U-shaped tube row of the primary economizer located in the front wall area and the rear wall area of ​​the furnace wall 400, wherein the first anti-wear box 200 can be fixed to the U-shaped tube row on the primary economizer by welding.

[0076] Reinstall the cut water-cooled wall to the furnace wall.

[0077] The above-mentioned installation method only requires cutting the furnace wall, pulling open the U-shaped tube row of the first-level economizer through the fall chain, and then installing the first anti-wear box 200 at the U-shaped tube row on the first-level economizer, and then installing the second anti-wear box 301, T-shaped connecting plate 304, baffle plate 303, and sealing plate 302 on the tube row on the first-level economizer on both sides of the furnace wall 400. The installation method is simple, and the installed first anti-wear box 200, second anti-wear box 301, T-shaped connecting plate 304, baffle plate 303, and sealing plate 302 can effectively prevent the flue gas from scouring the U-shaped tube row on the first-level economizer and the boiler tube row 100 on the first-level economizer on both sides of the furnace wall 400, causing them to wear, thereby increasing the service life of the first-level economizer.

[0078] 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 it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wear-proof device for a boiler tube bank, characterized in that: It comprises a plurality of first anti-wear boxes (200) and a plurality of through-wall pipe row anti-wear components (300); A plurality of the first anti-wear boxes (200) are respectively sleeved on the U-shaped tube banks (101) of the boiler tube banks (100) to prevent wear from occurring at the U-shaped tube banks (101) of the boiler tube banks (100); The boiler tube row (100) penetrates the furnace wall (400), and each of the boiler tube rows (100) located on both sides of the furnace wall (400) is provided with a through-the-wall tube row anti-wear component (300), the through-the-wall tube row anti-wear component (300) being used to prevent the boiler tube row (100) penetrating the furnace wall (400) from being worn; Each of the through-the-wall tube row anti-wear components (300) comprises a plurality of second anti-wear boxes (301) with openings at both ends, a plurality of T-shaped connecting plates (304) and two blocking plates (303); a second anti-wear box (301) is sleeved on each of the boiler tube rows (100) that pass through the furnace wall (400); the T-shaped connecting plate (304) is vertically arranged between two adjacent second anti-wear boxes (301) and is used to connect the two adjacent second anti-wear boxes (301) together; a blocking plate (303) is arranged on the top and bottom surfaces of the boiler tube rows (100) located on the same side of the furnace wall (400); the blocking plate (303) is perpendicular to the furnace wall (400) and one side thereof abuts against the surface of the furnace wall (400); The wall-penetrating pipe row anti-wear assembly (300) further includes two sealing plates (302); The two sealing plates (302) are respectively arranged at the top and bottom of the boiler tube row (100) penetrating the furnace wall (400), and each sealing plate (302) and the furnace wall (400), the blocking plate (303) and the second anti-wear box (301) are combined to form a closed space, and the closed space is filled with sealing material; A plurality of U-shaped grooves (3031) are formed on each of the baffle plates (303) at equal intervals along the length direction thereof, and the notches of the plurality of U-shaped grooves (3031) are fixed on the furnace wall (400); Also includes a flue gas flow equalizing plate (305); The flue gas flow equalizing plate (305) is perpendicular to the flue gas flow direction and one side of the flue gas flow equalizing plate (305) is fixed on the furnace wall (400); a plurality of flow equalizing holes (3051) are provided at equal intervals on the flue gas flow equalizing plate (305), and the plurality of flow equalizing holes (3051) are used to disperse the flue gas flowing through the flue gas flow equalizing plate (305).

2. The wear protection device for boiler tube bank according to claim 1, characterized in that: Anti-wear layers are provided on the outer surfaces of the first anti-wear box (200), the second anti-wear box (301), the T-shaped connecting plate (304), the blocking plate (303) and the sealing plate (302).

3. The wear protection device for boiler tube bank according to claim 2, characterized in that: The anti-wear layer is a ceramic-rubber composite wear-resistant plate.

4. The wear protection device for boiler tube bank according to claim 1, characterized in that: The first anti-wear box (200), the second anti-wear box (301), the T-shaped connecting plate (304), the blocking plate (303) and the sealing plate (302) are all made of stainless steel.

5. Use of a wear-proof device for boiler tube bank, characterized in that: The anti-wear device according to any one of claims 1 to 4 is used for a primary economizer or a boiler reheater including the boiler tube bank (100).

6. A method for installing a wear-proof device for a boiler tube bank, which is used for a boiler reheater installed in a boiler furnace, wherein: The anti-wear device for a boiler tube bank is the anti-wear device for a boiler tube bank according to any one of claims 1 to 4, characterized in that the installation method comprises: Cutting off the water-cooled wall in the front wall area and the water-cooled wall in the rear wall area of ​​the furnace wall (400), and pulling the U-shaped tube bank away from the through-wall tube bank in the boiler tube bank (100) by using a fall chain; A second anti-wear box (301) is sleeved on each tube row of the boiler reheater that passes through the water-cooled wall, a T-shaped connecting plate (304) is welded between each two adjacent second anti-wear boxes (301), and the U-shaped groove (3031) on the baffle plate (303) is welded to the water-cooled wall; Filling a sealing material in the gap between the water-cooled wall, the baffle plate (303) and the second anti-wear box (301), and welding the sealing plate (302) between a side of the baffle plate (303) away from the furnace wall (400) and a surface of the second anti-wear box (301); A first anti-wear box (200) is installed at the U-shaped tube bank of the boiler reheater in the front wall area and the rear wall area of ​​the furnace wall (400); The cut water-cooled wall is reinstalled on the furnace wall (400).

7. A method for installing a wear-proof device for a boiler tube bank, which is used for a primary economizer installed in a boiler furnace, wherein: The anti-wear device for a boiler tube bank is the anti-wear device for a boiler tube bank according to any one of claims 1 to 4, characterized in that the installation method comprises: Cutting off the water-cooled wall in the front wall area of ​​the furnace wall (400), and using a fall chain to pull the U-shaped tube bank away from the through-wall tube bank in the boiler tube bank (100); A second anti-wear box (301) is sleeved on each tube row of the first-stage economizer that passes through the water-cooled wall, a T-shaped connecting plate (304) is welded between each two adjacent second anti-wear boxes (301), and the U-shaped groove (3031) on the baffle plate (303) is welded to the water-cooled wall; Filling a sealing material in the gap between the water-cooled wall, the baffle plate (303) and the second anti-wear box (301), and welding the sealing plate (302) between a side of the baffle plate away from the furnace wall (400) and a surface of the second anti-wear box (301); Installing the first anti-wear box (200) at the U-shaped tube banks of the primary economizer located in the front wall area and the rear wall area of ​​the furnace wall (400); The cut water-cooled wall is reinstalled on the furnace wall (400).

Images