CN218455218U - Circulating fluidized bed boiler furnace metal sheet wear prevention device and boiler furnace - Google Patents
Circulating fluidized bed boiler furnace metal sheet wear prevention device and boiler furnace Download PDFInfo
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- CN218455218U CN218455218U CN202222813759.4U CN202222813759U CN218455218U CN 218455218 U CN218455218 U CN 218455218U CN 202222813759 U CN202222813759 U CN 202222813759U CN 218455218 U CN218455218 U CN 218455218U
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Abstract
The utility model discloses a circulating fluidized bed boiler furnace metal sheet wear prevention device and boiler furnace, the metal sheet wear prevention device includes horizontal metal sheet, vertical metal sheet, heating surface pipe and fin, the horizontal metal sheet is arranged along the horizontal direction multilayer, the vertical metal sheet is arranged along the vertical direction multiseriate; the transverse metal plate and the longitudinal metal plate are both vertical to the heating surface; the transverse metal plate is welded with the fins; the end parts of two horizontally adjacent transverse metal plates are lapped and are contacted with each other on the lapping surface; a gap is reserved between two vertical adjacent longitudinal metal plates; the transverse metal plate and the longitudinal metal plate are designed to be welded at a single position; compared with the active multi-step anti-abrasion beam, the heating surface of the hearth is not covered, so that the problems of temperature rise of the hearth and reduction of environmental protection property caused by the active multi-step anti-abrasion beam are solved. Compared with the conventional metal plate anti-abrasion device, the anti-abrasion device overcomes the problem of large welding seam thermal stress caused by multi-part welding, and improves the reliability of the anti-abrasion device.
Description
Technical Field
The utility model belongs to the technical field of coal-fired circulating fluidized bed boiler operation safety and furnace abrasionproof, concretely relates to circulating fluidized bed boiler metal sheet wear proof device and boiler furnace.
Background
The energy structure mainly based on fire coal, the economic policy of the thermal power plant using inferior coal as much as possible, the increasingly declining coal quality and the continuously improved thermal power peak regulation requirement, the fluctuation of the coal quality entering the plant caused by the purchase of the commercial coal, the serious atmospheric pollution brought in the coal mining and using process and the requirements of sustainable development and comprehensive resource utilization all urgently need a novel efficient coal-burning technology which can efficiently burn various low-heat fuels and has low pollution and good peak regulation capability. Driven by this market demand, circulating fluidized bed coal burning technology has come into force. Circulating fluidized bed boilers have certain advantages over conventional combustion methods. Although the CFB boiler has the advantages of strong fuel adaptability and low pollutant emission, the high-rate circulating ash flow of the circulating fluidized bed boiler causes severe abrasion of the hearth heating surface compared with the pulverized coal furnace: according to statistics, the accident rate of CFB boiler blowing out caused by abrasion reaches about 45% -50%, and the abrasion problem is more prominent when high-ash inferior coal is used.
The existing circulating fluidized bed boiler adopts the conventional thick-wall pipe, the anti-abrasion protective tile, the metal spraying, the active multi-step anti-abrasion beam main body as the anti-abrasion refractory material and the metal deceleration anti-abrasion plate and other anti-abrasion measures. Wherein, the active multi-step type anti-abrasion beam and the metal deceleration anti-abrasion plate are both active anti-abrasion technology.
The abrasion rate of the heating surface of the hearth of the circulating fluidized bed boiler is mainly closely related to the wall-attached material wind speed, the material particle size, the material concentration and the nonuniformity of a flow field. Because of many factors affecting wear and speed, qualitative analysis is generally performed by using a semi-empirical formula, that is, a 3-power relation of speed:
in the formula E-abrasion Rate, mm/10 3 h；k p Coefficient of ash characteristics, typically 10 -3 ；C p Particle concentration, kg/m 3 ；d p -ash mean diameter, mm; u is flue gas flow speed, m/s. The above formula shows that the wear rate of the flue gas flow velocity on the heating surface is the largest among all the influencing factors.
The active multi-step anti-abrasion beam device taking wear-resistant refractory materials as main bodies is arranged layer by layer along different elevations of a hearth, and gas-ash two-phase flow attached to the heating surface of the hearth is divided into a plurality of sections by the anti-abrasion beam along the height of free falling bodies around. The speed of the adherent movement of the material is not in the process of increasing all the time, but the height of the free falling body is greatly reduced due to certain obstruction, so that the speed of the adherent gas-ash two-phase flow is obviously reduced; the change of the material concentration can be understood as that the material falling to the upper layer of the speed reduction anti-abrasion device along the periphery of the hearth is blocked by the speed reduction anti-abrasion device, the moving direction of the gas-ash two-phase flow is changed, the gas-ash two-phase flow does not flow vertically downwards, but flows to the center of the hearth according to a certain angle, and therefore the ash particle concentration of the wall-attached gas-ash two-phase flow is reduced. The flow speed of the gas-ash two-phase flow attached to the heating surface of the hearth and the concentration of ash particles are reduced, so that the abrasion rate of the heating surface is reduced. The active multi-step type anti-abrasion beam has the advantage of being tightly attached to the heated surface, but because the heat conductivity coefficient of the anti-abrasion refractory material is low, the heat exchange quantity of the heated surface covered by the anti-abrasion beam is reduced, so that the temperature of a hearth is increased, the pollutant emission value of a boiler is increased, the dry desulfurization efficiency in the boiler is reduced, and even the load carrying capacity of the boiler is influenced.
The conventional metal decelerating wear-resistant plate wear-resistant device is arranged layer by layer along different elevations of a hearth, and generally comprises a transverse metal plate and a longitudinal metal plate which are welded and connected with fins on a heating surface of the hearth according to a certain distance. The anti-wear principle of the structural device is similar to that of the active multi-step anti-wear beam, and the hearth heating surface is not covered, so that the problem of hearth temperature rise caused by the active multi-step anti-wear beam is solved. The horizontal metal plate and the longitudinal metal plate of the wear-resistant device are made of heat-resistant stainless steel in consideration of the thermal use scene of the hearth. In structural design, the transverse metal plate and the longitudinal metal plate are generally welded with the fins at two or more positions. In the hot-state operation of the boiler, the problems of irregular deformation, falling off and the like of the metal plate caused by large welding line thermal stress due to the fact that the linear expansion coefficients of the metal plate material, the heated surface tube and the fin material are greatly different can be generated. The occurrence of the above-mentioned problems further causes local wear of the heating surface to be intensified.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a circulating fluidized bed boiler metal plate anti-abrasion device and a boiler furnace; the metal plate anti-abrasion device is short in size, only one welding point is formed between the metal plate anti-abrasion device and the water cooling wall fin, the expansion amount of the metal plate is small, and the expansion stress between the two welding points does not exist. The device has possessed conventional metal sheet wear proof device and has not influenced the advantage that furnace conducts heat, has overcome the big problem of welding seam thermal stress that many parts welding caused, improves wear proof device's reliability, installs this metal sheet wear proof device's circulating fluidized bed boiler furnace, and the furnace of comparing conventional structure has higher operational safety and stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a hearth metal plate anti-abrasion device of a circulating fluidized bed boiler comprises a transverse metal plate, a longitudinal metal plate, a heating surface pipe and fins, wherein the transverse metal plate is arranged in multiple layers along the horizontal direction, and the longitudinal metal plate is arranged in multiple lines along the vertical direction; the transverse metal plate and the longitudinal metal plate are both vertical to the heating surface; the transverse metal plate is welded with the fins; the end parts of two horizontally adjacent transverse metal plates are lapped and are contacted with each other on the lapping surface; a gap is reserved between two vertical adjacent longitudinal metal plates; the length of the welding position of the transverse metal plate and the longitudinal metal plate is smaller than the length of the welding position of the transverse metal plate and the longitudinal metal plate, and the transverse metal plate and the longitudinal metal plate are designed to be welded at a single position.
The arrangement positions of the transverse metal plates and the longitudinal metal plates are arranged from the refractory material termination line of the hearth to the upper plane of the hearth outlet.
The welding parts of the transverse metal plate and the longitudinal metal plate are both positioned in the middle.
The transverse metal plate and the longitudinal metal plate are manufactured by heat-resistant alloy cast steel, so that the whole service life of the anti-abrasion device is effectively prolonged.
The upper area of the hearth is divided into three areas, namely an area I, an area II and an area III according to the wear tendency of the heating surface; the material concentration of the area I is high, and the quantity of the transverse metal plates and the longitudinal metal plates is determined according to the wear detection data of the heating surface; the material concentration of the area II is lower than that of the area I, the arrangement density of the anti-abrasion device is properly reduced, and the number of the transverse metal plates and the number of the longitudinal metal plates are determined according to the abrasion detection data of the heating surface; the arrangement density of the horizontal metal plates and the longitudinal metal plates in the area II is lower than that of the area I, and the arrangement density of the longitudinal metal plates in the area III is higher than that of the area I.
The distance between the upper layer and the lower layer of the transverse metal plate in the I area is 0.5-1 m; the distance between the two adjacent left and right columns of the longitudinal metal plate is that every two fins are arranged in one column, if the lateral wear exceeds the monitoring value, each fin is arranged in one column, if the lateral wear does not exceed the monitoring value, the two adjacent upper and lower layers of the transverse metal plate in the area II are arranged according to the distance of 1.5-2.0 m; arranging a row of longitudinal metal plates according to every four fins, increasing the number of the rows of the longitudinal metal plates if the lateral wear exceeds a monitoring value, and not arranging the longitudinal metal plates if the lateral wear does not exceed the monitoring value; the interval between the upper layer and the lower layer of the horizontal metal plate in the III area is arranged according to 2.0-2.5 m; every two fins of the longitudinal metal plate are arranged in a row, and if the lateral abrasion exceeds a monitoring value, each fin is arranged in a row; the mounting height of the transverse metal plate at the top layer is consistent with the elevation of the upper plane of the hearth outlet.
The machining size of the transverse metal plate is determined according to the following principle: the outer side length L1 is determined according to the distance between the heated surface pipes in the anti-abrasion area; taking the length L2 of the inner side of the metal plate as 3-5 mm, and taking the length L2 as a lap joint transition area of two adjacent transverse metal plates; the whole width W1 is determined according to the outer diameter size of the heated surface pipe of the anti-abrasion area plus 30-35 mm; the length W2 of the joint with the fin is determined according to the side length of the fin; the radian radius R of the joint of the inner side and the heated surface pipe is determined according to the external diameter size of the heated surface pipe plus 1 mm; the size C of the transition part of the fin and the heated surface tube is determined according to the height of the welding seam of the fin and the heated surface tube plus 1 mm; the thickness of the transverse metal plate is 5-6 mm; the machining size of the longitudinal metal plate is determined according to the following principle: the length L3 of the longitudinal metal plate is determined according to the vertical height of the wear-resistant area of the heating surface of the hearth and the arrangement distance of the transverse metal plates, and is set to be 200-250 mm; the width W3 of the longitudinal metal plate is the same as the whole width W1 of the transverse metal plate; the thickness of the longitudinal metal plate is 5-6 mm.
And at the overlapping position of the transverse metal plate and the longitudinal metal plate, the longitudinal metal plate avoids the transverse metal plate, and a gap is reserved between the transverse metal plate and the longitudinal metal plate.
And repairing the part of the transverse metal plate with the gap between the transverse metal plate and the heating surface tube larger than 3mm by using a high-temperature-resistant gap filler.
The utility model provides a circulating fluidized bed boiler furnace adopts above-mentioned circulating fluidized bed boiler furnace metal sheet wear proof device.
Compared with the prior art, the utility model discloses following beneficial effect has at least: the hearth integral anti-abrasion structure is formed by adopting the transverse metal plate and the longitudinal metal plate, so that the abrasion of hearth wall-attached materials to a heated surface pipe due to scouring can be effectively reduced. Compared with the active multi-step type anti-abrasion beam, the heating surface of the hearth is not covered, so that the problems of temperature rise of the hearth and reduction of environmental protection property caused by the active multi-step type anti-abrasion beam are solved; the welding parts of the transverse metal plate and the longitudinal metal plate are positioned in the middle part, the single-part welding design is adopted, the transverse metal plate can freely expand towards the left side and the right side, and the transverse metal plate can freely expand towards the upper side and the lower side in the hot-state operation of the boiler, so that the problems of deformation, falling off and the like of the transverse metal plate with the multi-part welding design due to thermal stress are avoided,
furthermore, the transverse metal plate and the longitudinal metal plate are manufactured by adopting heat-resistant alloy cast steel, so that the whole service life of the anti-abrasion device is effectively prolonged.
Furthermore, the transverse metal plate and the longitudinal metal plate are both manufactured by adopting heat-resistant alloy cast steel, so that the application requirements of high temperature and high material concentration in the heating surface area of the circulating fluidized bed boiler hearth are met.
Furthermore, after the metal plate anti-abrasion device is installed, the gap between the whole transverse metal plate and the heating surface pipe is checked, and the part with the large gap is repaired by adopting a high-temperature resistant gap filler to prevent a local new abrasion point from being generated.
Drawings
Fig. 1 is a schematic overall layout of the present invention;
FIG. 2 is a view showing a structure of a transverse metal plate;
FIG. 3 is a view showing a longitudinal metal plate structure;
FIG. 4 is a schematic view of a transverse metal plate installation, wherein a is a schematic side view, b is a schematic front view, and c is a schematic top view;
fig. 5 is a schematic view of the installation of the longitudinal metal plate, wherein a is a schematic view in front and b is a schematic view in top.
Wherein, 1 is a circulating fluidized bed boiler furnace, 2 is a horizontal metal plate, 3 is a longitudinal metal plate, 4 is a heating surface pipe, and 5 is a fin.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the circulating fluidized bed boiler furnace metal plate abrasion-proof device comprises a boiler furnace 1, which is enclosed by a furnace front wall, a furnace rear wall and a furnace side wall, and is divided into an upper part and a lower part by taking a horizontal plane where a refractory material termination line is located as a boundary, wherein the lower part of the furnace is high in material concentration and is laid by a refractory material, the upper part of the furnace is an exposed heating surface assembly, the heating surface assembly comprises a heating surface tube 4 and a fin 5, the heating surface tube 4 and the fin 5 are welded to form the furnace heating surface assembly, and the furnace heating surface can adopt a water-cooled wall and a screen-type heating surface.
The upper area of the hearth 1 is divided into three areas, namely an area I, an area II and an area III according to the wear tendency of the heating surface. The heights of the II area, the III area and the I area are gradually reduced, and the arrangement densities of the transverse metal plate 2 and the longitudinal metal plate 3 in different areas are designed according to the wear tendency and the characteristics of the heating surface in different areas on the upper part of the hearth 1 and by combining the wear detection data of the heating surface.
The distance between the upper layer and the lower layer of the transverse metal plate 2 in the area I is arranged according to 0.5-1 m; the distance between the left and right adjacent columns of the longitudinal metal plate 3 is 1 column for every 2 fins, if the lateral abrasion is serious, 1 column can be arranged for every fin, and if the lateral abrasion is not obvious, the lateral abrasion can not be arranged. The distance between the upper layer and the lower layer of the horizontal metal plate 2 in the area II is arranged according to 1.5-2.0 m; the longitudinal metal plates 3 are arranged in 1 row according to 4 fins, if the longitudinal metal plates are obviously worn laterally, the number of the longitudinal metal plate rows is increased, and if the longitudinal metal plates are not obviously worn, the longitudinal metal plates can not be arranged. The interval between the upper layer and the lower layer of the horizontal metal plate 2 in the III area is arranged according to 2.0-2.5 m; 1 row is arranged on every 2 fins of the longitudinal metal plate, and if obvious lateral abrasion exists, 1 row can be arranged on each fin; the installation height of the transverse metal plate 2 at the top layer is consistent with the elevation of the upper plane of the hearth outlet.
As shown in fig. 2, the machining dimension of the transverse metal sheet 2 is determined according to the following principle: the outer side length L1 is determined according to the distance between the heated surface pipes in the anti-abrasion area; taking the length L2 of the inner side of the metal plate as 3-5 mm, and taking the length L2 as a lap joint transition area of two adjacent transverse metal plates; the whole width W1 is determined by adding 30-35 mm to the outer diameter of the heated surface pipe in the anti-abrasion area; the length W2 of the joint of the fin 5 is determined according to the side length of the fin; the radian radius R of the joint of the inner side and the heated surface tube 4 is determined according to the external diameter size of the heated surface tube 4 plus 1 mm; the size C of the transition part of the fin 5 and the heated surface tube 4 is determined according to the height of the welding seam of the fin and the heated surface tube plus 1 mm; the thickness of the transverse metal plate is generally 5-6 mm.
The transverse metal plates 2 are manufactured by heat-resistant alloy cast steel, the single welding part is designed, each transverse metal plate 2 and the corresponding part of the fin 5 are welded on two sides, the height of a welding seam is not less than 4mm, the adjacent transverse metal plates 2 are arranged in an up-and-down lap joint mode, the installation schematic diagram is shown in figure 4, wherein a is a side schematic diagram, b is a front schematic diagram, and c is a top schematic diagram. The welding part of the transverse metal 2 and the corresponding fin 5 is only one, and the transverse metal plate 2 can freely expand towards the left side and the right side in the hot operation of the boiler, so that the problem that the transverse metal plate 2 deforms or falls off due to the welding thermal stress of a plurality of parts is solved.
As shown in fig. 3, the machining dimension of the longitudinal metal plate 3 is determined according to the following principle: the length L3 of the longitudinal metal plate is determined according to factors such as the vertical height of an anti-abrasion area of a heating surface of the hearth, the arrangement interval of the transverse metal plates 2 and the like, and is set to be 200-250 mm; the width W3 of the longitudinal metal plate is the same as the whole width W1 of the transverse metal plate 2; the thickness of the longitudinal metal plate 3 is 5-6 mm.
The longitudinal metal plates 3 are manufactured by heat-resistant alloy cast steel, the single welding position is designed, each longitudinal metal plate and the corresponding fin 5 are welded on two sides, the height of a welding seam is not less than 4mm, a gap of 2mm is generally reserved between every two adjacent longitudinal metal plates, the installation schematic diagram is shown in figure 5, wherein a is a front schematic diagram, and b is a top schematic diagram. The welding part of the longitudinal metal plate 3 and the corresponding fin 5 is only one, and the longitudinal metal plate 3 can freely expand upwards and downwards in the hot-state operation of the boiler, so that the problem that the longitudinal metal plate 3 deforms or falls off due to the welding thermal stress of multiple parts is solved.
And (3) installing the metal plate anti-abrasion device according to the requirements, checking the gap between the whole transverse metal plate 2 and the heated surface pipe 5, and repairing the part with the gap larger than 3mm by adopting a high-temperature-resistant gap filler.
To sum up, the metal plate anti-abrasion device for the boiler furnace of the circulating fluidized bed and the boiler furnace fill a blank in the technical field in China; the metal plate anti-abrasion device adopts a transverse metal plate and a longitudinal metal plate to form an integral anti-abrasion structure of a hearth. Can effectively reduce the abrasion of hearth wall-adhering materials to the heated surface pipe. The furnace hearth wear-resisting device has the advantages that the heat transfer of a hearth is not influenced by a conventional metal plate wear-resisting device, and the problem of large welding seam thermal stress caused by multi-part welding is solved. The reliability of the anti-abrasion device is improved. Compared with the hearth with a conventional structure, the hearth of the circulating fluidized bed boiler provided with the metal plate anti-abrasion device has higher operation safety and stability.
Claims (10)
1. The anti-abrasion device for the metal plate of the circulating fluidized bed boiler hearth is characterized by comprising a transverse metal plate (2), a longitudinal metal plate (3), a heated surface pipe (4) and fins (5), wherein the transverse metal plate (2) is arranged in a plurality of layers along the horizontal direction, and the longitudinal metal plate (3) is arranged in a plurality of rows along the vertical direction; the transverse metal plate (2) and the longitudinal metal plate (3) are both vertical to the heating surface; the transverse metal plate (2) is welded with the fins (5); the end parts of two horizontal adjacent transverse metal plates (2) are lapped and are contacted with each other on the lapping surface; a gap is reserved between two vertical adjacent longitudinal metal plates (3); the length of the welding position of the transverse metal plate (2) and the longitudinal metal plate (3) is smaller than the length of the transverse metal plate and the longitudinal metal plate, and the transverse metal plate and the longitudinal metal plate are designed to be welded at a single position.
2. The circulating fluidized bed boiler furnace metal plate wear prevention device according to claim 1, characterized in that the horizontal metal plate (2) and the vertical metal plate (3) are arranged from the furnace refractory termination line to the furnace exit upper plane.
3. The circulating fluidized bed boiler furnace metal plate wear prevention device according to claim 1, characterized in that the welding points of the transversal metal plates (2) and the longitudinal metal plates (3) are located in the middle.
4. The circulating fluidized bed boiler furnace metal plate wear prevention device of claim 1, characterized in that the horizontal metal plate (2) and the vertical metal plate (3) are made of heat-resistant alloy cast steel, which effectively improves the overall service life of the wear prevention device.
5. The circulating fluidized bed boiler furnace metal plate wear prevention device of claim 1, characterized in that the upper region of the furnace (1) is divided into three regions of zone i, zone ii and zone iii according to the wear tendency of the heating surface; the material concentration of the area I is high, and the quantity of the transverse metal plates (2) and the longitudinal metal plates (3) is determined according to the wear detection data of the heating surface; the material concentration of the second area is lower than that of the first area, the arrangement density of the anti-abrasion device is properly reduced, and the quantity of the transverse metal plates (2) and the longitudinal metal plates (3) is determined according to the abrasion detection data of the heating surface; the arrangement density of the horizontal metal plates (2) and the longitudinal metal plates (3) in the area II is lower than that of the area I, and the arrangement density of the longitudinal metal plates (3) in the area III is higher than that of the area I.
6. The circulating fluidized bed boiler furnace metal plate wear prevention device of claim 5, characterized in that the distance between the upper and lower adjacent layers of the horizontal metal plate (2) of zone I is 0.5-1 m; the distance between the left adjacent column and the right adjacent column of the longitudinal metal plate (3) is that every two fins are arranged in one column, if the lateral wear exceeds the monitoring value, each fin is arranged in one column, and if the lateral wear does not exceed the monitoring value, the fins are not arranged; the distance between the upper layer and the lower layer of the horizontal metal plate (2) in the area II is arranged according to 1.5-2.0 m; the longitudinal metal plates (3) are arranged in a row according to every four fins, if the lateral wear exceeds a monitoring value, the number of the rows of the longitudinal metal plates is increased, and if the lateral wear does not exceed the monitoring value, the longitudinal metal plates are not arranged; the interval between the upper layer and the lower layer of the horizontal metal plate (2) in the III area is arranged according to 2.0-2.5 m; every two fins of the longitudinal metal plate are arranged in a row, and if the lateral abrasion exceeds a monitoring value, each fin is arranged in a row; the installation height of the transverse metal plate (2) at the top layer is consistent with the elevation of the upper plane of the hearth outlet.
7. The circulating fluidized bed boiler furnace metal plate wear prevention device according to claim 1, characterized in that the machining size of the transversal metal plate (2) is determined according to the following principle: the length L1 of the outer side is determined according to the distance between the heating surface pipes in the anti-abrasion area; the length L2 of the inner side is 3-5 mm and is used as a lap joint transition area of two adjacent transverse metal plates; the whole width W1 is determined according to the outer diameter size of the heated surface pipe of the anti-abrasion area plus 30-35 mm; the length W2 of the joint of the fin (5) is determined according to the side length of the fin; the radian radius R of the joint of the inner side and the heated surface pipe (4) is determined according to the external diameter size of the heated surface pipe (4) plus 1 mm; the size C of the transition part of the fin (5) and the heated surface tube (4) is determined according to the height of the welding seam of the fin and the heated surface tube plus 1 mm; the thickness of the transverse metal plate is 5-6 mm; the machining size of the longitudinal metal plate (3) is determined according to the following principle: the length L3 of the longitudinal metal plate (3) is determined according to the vertical height of the wear-resistant area of the heating surface of the hearth and the arrangement distance of the transverse metal plates (2), and is set to be 200-250 mm; the width W3 of the longitudinal metal plate is the same as the whole width W1 of the transverse metal plate (2); the thickness of the longitudinal metal plate (3) is 5-6 mm.
8. The circulating fluidized bed boiler furnace metal plate wear prevention device according to claim 7, characterized in that at the overlapping position of the transverse metal plate (2) and the longitudinal metal plate (3), the longitudinal metal plate (3) is set back from the transverse metal plate (2) with a gap left between them.
9. The circulating fluidized bed boiler furnace metal plate wear prevention device of claim 1, characterized in that the gap between the transverse metal plate (2) and the heated surface pipe (4) is larger than 3mm and is repaired by high temperature resistant joint mixture.
10. A circulating fluidized bed boiler furnace, characterized in that the circulating fluidized bed boiler furnace metal plate wear prevention device of any one of claims 1 to 9 is adopted.
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