A composite high-temperature damper for high-temperature flue and assembly method

Abstract

The present invention provides a composite high-temperature gate for a high-temperature flue and an assembly method. The high-temperature gate is provided with a pulley mounting seat and a pulley block on a skeleton fixing plate, multiple sets of main skeletons are fixed on the skeleton fixing plate, high-temperature resistant modules are installed on the main skeleton, and multiple sets of module positioning plates are pressed on the outer surface. The module positioning plates and the ends of the skeleton fixing plates are respectively welded to the gate outer frame, and the bottom of the main skeleton is welded to the gate outer frame, so that the skeleton fixing plate, the main skeleton, the module fixing plate, the high-temperature resistant module and the gate outer frame form a whole. The assembly method of the method includes the following steps: 1. Preliminary preparation; 2. Prefabrication of high-temperature resistant modules; 3. Assembly of the gate. The high-temperature gate can be used in a heat recovery high-temperature flue or a general high-temperature flue. When the flue operating temperature is ≤1480℃, the gate can be used for a long time, has excellent resistance to rapid cooling and heating, and has strong resistance to airflow scouring. It can be used in combination with a high-temperature valve or alone.

Description

Technical Field

[0001] The invention relates to the field of valve gate manufacturing, and in particular to a composite high-temperature gate used for a high-temperature flue and an assembly method thereof. Background Art

[0002] In all kinds of high-temperature flue gas pipelines currently in use, high-temperature valves are generally used to control high-temperature flue gas, and the operating temperature in high-temperature flue gas pipelines can generally reach about 1400°C. When controlling the flue gas in the high-temperature flue, the valve plate in the high-temperature valve needs to be frequently raised (opened) or lowered (closed), and the high-temperature flue gas in the flue is regulated by raising or lowering the gate plate. The gate plates in the prior art have always been made of refractory amorphous castables. The weight of the gate plates made of refractory amorphous castables is very heavy. During the frequent opening or closing process, the gate plates themselves have to undergo a continuous alternation of hot and cold. The alternation of high and low temperatures will cause local cracks on the gate plates. As the gate plates are used for a longer time, the cracks on the gate plates will continue to expand, and finally cause the local structure of the gate plates to break, causing the broken part or most of the gate plates to fall into the flue gas pipeline due to gravity. Once the gate is broken in the flue gas duct, it is difficult to remove it from the high-temperature flue because the gate is made of refractory amorphous castables and is very heavy. When removing it, the high-temperature flue needs to be shut down and cooled down before maintenance personnel can enter the flue to operate. This increases the labor of inspection and maintenance, increases the cost of economic investment of the enterprise, and affects the normal production and operation of the enterprise.

[0003] The patent number is 201420601871.4, and the patent name is a utility model patent for a double-layer structure of an ultra-high temperature gate valve body. Its technical features are: the shell is lined with a heat-resistant calcium silicate board, the lower surface of the calcium silicate board is bonded to the shell with an adhesive, and is fastened to the shell through a clamping anchor, the upper surface of the calcium silicate board is sprayed with waterproof glue, and the upper part of the calcium silicate board is provided with a palladium nail, which is welded to the clamping anchor plate, and the upper part of the calcium silicate board is cast through a casting template set on the periphery to form a casting layer. The operating temperature in the high-temperature flue to which this patent applies generally does not exceed 900°C. When the operating temperature is higher than 900°C, the gate will still break.

[0004] The patent number is 201410329882.6, and the patent name is an invention patent for a new type of ultra-high temperature mesh cage gate and its processing technology. Its technical features are: the upper part of the plate body is a rectangular mesh cage structure, and the lower part is a semicircular structure. There are multiple groups of vertical longitudinal ribs symmetrically welded on the main beam of the upper part of the plate body, and multiple groups of horizontal transverse ribs symmetrically welded on each longitudinal rib. Vertical ribs for support and reinforcement are arranged at the intersection of the longitudinal ribs and the transverse ribs, and the inner and outer surfaces of the plate body are cast through the injection molds set on the periphery to form a casting layer. The main structure of this invention patent is still inseparable from the casting layer formed by the casting material, and the weight of the gate itself will not be reduced. Summary of the invention

[0005] The purpose of the present invention is to provide a composite high-temperature damper and assembly method for high-temperature flues. The technical problem to be solved by the present invention is: polycrystalline fibers are prefabricated into high-temperature resistant modules, and the high-temperature resistant modules are assembled with the main frame and the module positioning plate into high-temperature dampers, which solves the problems existing in the prior art such as low resistance to rapid cooling and heating of the high-temperature damper structure material, short service life, easy breakage, and easy clogging of the flue.

[0006] The design concept of the present invention is: 1. High-temperature alloy is used as the frame, main skeleton and module positioning plate of the gate plate to ensure the strength and firmness of the overall structure of the gate plate under high temperature conditions; 2. Polycrystalline fibers are prefabricated into special modules and inserted into the main skeleton in the frame. According to the temperature curve of the high-temperature flue section, high-temperature resistant modules made of different types of polycrystalline fibers are spliced ​​to make the high-temperature resistant modules the main body of the gate plate, ensuring that the gate plate with the high-temperature resistant modules as the main body will not break under the thermal shock resistance state of continuous rapid heating and cooling.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A composite high-temperature gate for a high-temperature flue comprises: a pulley block, a pulley mounting seat, a skeleton fixing plate, a main skeleton, a module fixing plate, a high-temperature resistant module and a gate outer frame. The high-temperature gate is provided with a pulley mounting seat on the skeleton fixing plate, the pulley mounting seat is provided with a pulley block, a plurality of groups of main skeletons are fixedly installed on the skeleton fixing plate, a high-temperature resistant module is installed on the main skeleton, a plurality of groups of module positioning plates are pressed onto the two outer surfaces of the high-temperature resistant module, two ends of the module positioning plates are respectively welded to the gate outer frame, two ends of the skeleton fixing plate are respectively welded to the gate outer frame, and the bottom of the main skeleton is welded to the gate outer frame, so that the skeleton fixing plate, the main skeleton, the module fixing plate, the high-temperature resistant module and the gate outer frame form a whole.

[0009] The high temperature resistant module in the high temperature gate is prefabricated with polycrystalline fiber material, and its thickness is 150-300mm. The prefabricated high temperature resistant module is provided with perforations of the main skeleton, and the polycrystalline fiber is any one of polycrystalline ceramic fiber, polycrystalline mullite fiber, polycrystalline alumina fiber, and composite polycrystalline fiber (reinforcement). The polycrystalline fiber used is preferably any one of polycrystalline ceramic fiber and polycrystalline mullite fiber.

[0010] The frame fixing plate, main frame, module fixing plate and gate outer frame in the high-temperature gate are made of high-temperature alloy, and the gate outer frame is an integral body formed by welding high-temperature alloy bent channel steel.

[0011] A method for assembling a composite high-temperature damper for a high-temperature flue, characterized in that the method comprises the following steps:

[0012] 1. Preliminary preparation: Determine the width of the frame fixing plate and the gate frame as well as the height of the main frame and the gate frame according to the size of the high-temperature flue section used, and weld the bottom and both sides of the gate frame into a whole;

[0013] 2. Prefabrication of high temperature resistant modules: Determine the type and quantity of prefabricated high temperature resistant modules according to the size of the high temperature flue section and the cross-sectional temperature curve. Use different polycrystalline fiber materials to prefabricate different types of high temperature resistant modules. The thickness of the high temperature resistant modules is 150-300mm. The prefabricated high temperature resistant modules are perforated with the main frame.

[0014] 3. Assembly of the gate: install the pulley mounting seat on the skeleton fixing plate, install the pulley block on the pulley mounting seat, install multiple sets of main skeletons on the skeleton fixing plate, and install various high-temperature resistant modules on the main skeleton according to the temperature curve of the high-temperature flue section. After the high-temperature resistant modules are installed, press multiple sets of module positioning plates on its two outer surfaces. The two ends of the module positioning plates are welded to the gate outer frames on both sides, the two ends of the skeleton fixing plate are welded to the gate outer frames, and the bottom of the main skeleton is welded to the gate outer frame, so that the skeleton fixing plate, main skeleton, module fixing plate, high-temperature resistant module and gate outer frame form a complete high-temperature gate.

[0015] Compared with the prior art, the present invention has the following positive effects:

[0016] 1. The high-temperature gate can be used in heat recovery high-temperature flue or general high-temperature flue. When the flue working temperature is ≤1480℃, the gate can be used for a long time;

[0017] 2. The high temperature resistant module used in the high temperature gate has a temperature resistance of 1600℃, excellent resistance to rapid cooling and heating, and strong resistance to air flow erosion;

[0018] 3. During the long-term use of the high-temperature gate, the high-temperature resistant module will present powder and peel off from the surface of the high-temperature resistant module. The peeled powder will be blown away by the airflow in the high-temperature flue;

[0019] 4. The high temperature gate can be used in combination with the high temperature valve in the high temperature flue, or it can be used alone in the high temperature flue;

[0020] 5. The gate plate assembled by this method will not break or block the pipeline during long-term use, and will not affect the normal operation of the normal enterprise production;

[0021] 6. The weight of the gate plate assembled by this method is only one seventh of the weight of the existing gate plate, and it is very convenient to install and replace;

[0022] 7. The gate plate assembled using this method solves the chronic problems of existing high-temperature gate plates. During the service life of the gate plate, it can basically be maintenance-free, greatly reducing the cost of the enterprise's economic investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technology of the present invention, the drawings required for use in the implementation are briefly introduced. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the technology of the present invention.

[0025] Figure 1 , schematic diagram of the main structure of the composite high-temperature gate;

[0026] Figure 2 , side view structural diagram of the composite high temperature gate.

[0027] In the figure: 1. pulley block, 2. pulley mounting seat, 3. frame fixing plate, 4. main frame, 5. module fixing plate, 6. high temperature resistant module, 7. gate outer frame. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described clearly and completely below in conjunction with the accompanying drawings and embodiments.

[0029] See attached Figure 1-2The high-temperature gate is provided with a pulley mounting seat 2 on the skeleton fixing plate 3, and a pulley block 1 is installed on the pulley mounting seat 2. Multiple groups of main skeletons 4 are fixed on the skeleton fixing plate 3, and a high-temperature resistant module 6 is installed on the main skeleton 4. Multiple groups of module positioning plates 5 are pressed on the two outer surfaces of the high-temperature resistant module 6. The two ends of the module positioning plates 5 are respectively welded to the gate outer frame 7, and the two ends of the skeleton fixing plate 3 are respectively welded to the gate outer frame 7. The bottom of the main skeleton 4 is welded to the gate outer frame 7, so that the skeleton fixing plate 3, the main skeleton 4, the module fixing plate 5, the high-temperature resistant module 6 and the gate outer frame 7 form a whole.

[0030] The high temperature resistant module 6 in the high temperature gate plate is prefabricated with polycrystalline fiber material, and its thickness is 150-300mm. The prefabricated high temperature resistant module 6 is perforated with the main skeleton 4. The polycrystalline fiber is any one of polycrystalline ceramic fiber, polycrystalline mullite fiber, polycrystalline alumina fiber, and composite polycrystalline fiber (reinforcement).

[0031] The frame fixing plate 3, the main frame 4, the module fixing plate 5 and the gate outer frame 7 in the high-temperature gate are made of high-temperature alloy, and the gate outer frame 7 is a whole formed by welding high-temperature alloy bent channel steel. Embodiment 1

[0032] The use of gate and high temperature valve

[0033] 1. Preliminary preparation: Determine the width of the frame fixing plate 5 and the gate outer frame 7 and the height of the main frame 4 and the gate outer frame 7 according to the installation size of the high-temperature valve to be used, and weld the bottom and both sides of the gate outer frame 7 into a whole;

[0034] 2. Prefabrication of high temperature resistant modules: The type and quantity of the prefabricated high temperature resistant modules 6 are determined according to the size of the high temperature flue cross section and the cross section temperature curve diagram, and different types of high temperature resistant modules 6 are prefabricated using different polycrystalline fiber materials. The thickness of the high temperature resistant modules 6 is 150-300 mm, and the prefabricated high temperature resistant modules 6 are provided with perforations of the main frame 4;

[0035] 3. Assembly of the gate: Install the pulley mounting seat 2 on the frame fixing plate 5, the pulley block 1 on the pulley mounting seat 2, and install multiple sets of main frames 4 on the frame fixing plate 5. According to the temperature curve of the high-temperature flue section, install various types of high-temperature resistant modules 6 on the main frame 4 according to the temperature. After the high-temperature resistant modules 6 are installed, press multiple sets of module positioning plates 5 on its two outer surfaces. The two ends of the module positioning plates 5 are respectively welded to the gate outer frames 7 on both sides, the two ends of the frame fixing plate 3 are respectively welded to the gate outer frames 7 on both sides, and the bottom of the main frame 4 is welded to the gate outer frame 7, so that the frame fixing plate 3, the main frame 4, the module fixing plate 5, the high-temperature resistant module 6 and the gate outer frame 7 form a complete high-temperature gate. After the gate and the high-temperature valve are assembled, install them in the high-temperature flue. Embodiment 2

[0036] Direct use of dampers in high-temperature flues

[0037] 1. Preliminary preparation: Determine the width of the frame fixing plate 5 and the gate outer frame 7 and the height of the main frame 4 and the gate outer frame 7 according to the internal dimensions of the high-temperature flue used, and weld the bottom and both sides of the gate outer frame 7 into a whole;

[0038] 2. Prefabrication of high temperature resistant modules: The type and quantity of the prefabricated high temperature resistant modules 6 are determined according to the size of the high temperature flue cross section and the cross section temperature curve diagram, and different types of high temperature resistant modules 6 are prefabricated using different polycrystalline fiber materials. The thickness of the high temperature resistant modules 6 is 150-300 mm, and the prefabricated high temperature resistant modules 6 are provided with perforations of the main frame 4;

[0039] 3. Assembly of the gate: Install the pulley mounting seat 2 on the frame fixing plate 5, the pulley block 1 on the pulley mounting seat 2, and install multiple sets of main frames 4 on the frame fixing plate 5. According to the temperature curve of the high-temperature flue section, install various types of high-temperature resistant modules 6 on the main frame 4 according to the temperature. After the high-temperature resistant modules 6 are installed, press multiple sets of module positioning plates 5 on its two outer surfaces. The two ends of the module positioning plates 5 are respectively welded to the gate outer frames 7 on both sides, the two ends of the frame fixing plate 3 are respectively welded to the gate outer frames 7 on both sides, and the bottom of the main frame 4 is welded to the gate outer frame 7, so that the frame fixing plate 3, the main frame 4, the module fixing plate 5, the high-temperature resistant module 6 and the gate outer frame 7 form a complete high-temperature gate. Then install the assembled gate in the high-temperature flue.

[0040] Example detection results

[0041] Table 1 Performance indicators of polycrystalline modules

[0042]

[0043] Table 2 Low cement mullite steel fiber castable

[0044]

[0045] From the comparison between Table 1 and Table 2, it can be seen that 1. The weight of the polycrystalline module is only 1 / 7 of that of the castable, the finished gate is light, and the construction and installation are convenient, which greatly reduces the transportation and installation costs; 2. The flue gas velocity in the flue gas duct is generally 15m / s, and the polycrystalline module can fully resist the wind speed of the flue gas duct and prevent wind erosion; 3. The thermal conductivity of the polycrystalline module is extremely low, which can effectively isolate heat conduction and greatly improve the service life of the gate; 4. In the thermal shock test, the composite gate made of polycrystalline modules has no cracks or peeling, and the thermal shock resistance is more than six times higher than that of the castable gate.

[0046] All features disclosed in this specification, or the connection methods or relative positions of all disclosed components, except for mutually exclusive features and / or steps, can be combined in any way. Any feature disclosed in this specification (including claims and abstract), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0047] The above is only a non-limiting implementation mode of the present invention, and a large number of embodiments can be derived. For ordinary technicians in this field, without departing from the creative concept of the present invention and without making creative work, several modified and improved embodiments can be made, which all fall within the protection scope of the present invention.

Claims

1. A method for assembling a composite high-temperature damper for a high-temperature flue, characterized in that: The assembly method comprises the following steps: (1) Preliminary preparation: Determine the width of the frame fixing plate (3) and the gate outer frame (7) and the height of the main frame (4) and the gate outer frame (7) according to the size of the high-temperature flue cross section used, and weld the bottom and both sides of the gate outer frame (7) into a whole; (2) Prefabrication of high temperature resistant modules: the type and quantity of the prefabricated high temperature resistant modules (6) are determined according to the size of the high temperature flue cross section and the cross section temperature curve diagram, and different types of high temperature resistant modules (6) are prefabricated using different polycrystalline fiber materials. The thickness of the high temperature resistant modules (6) is 150-300 mm, and the prefabricated high temperature resistant modules (6) are provided with perforations of the main frame (4); (3) Assembly of the gate: the pulley mounting seat (2) is fixedly mounted on the frame fixing plate (3), the pulley block (1) is fixedly mounted on the pulley mounting seat (2), a plurality of sets of main frames (4) are fixedly mounted on the frame fixing plate (3), and various types of high temperature resistant modules (6) are installed on the main frames (4) according to the temperature curve of the high temperature flue cross section. After the high temperature resistant modules (6) are installed, a plurality of sets of module positioning plates (5) are press-fitted on the two outer surfaces thereof, the two ends of the module positioning plates (5) are respectively welded to the gate outer frames (7), the two ends of the frame fixing plate (3) are respectively welded to the gate outer frames (7) on both sides, and the bottom of the main frame (4) is welded to the gate outer frame (7), so that the frame fixing plate (3), the main frame (4), the module positioning plates (5), the high temperature resistant modules (6) and the gate outer frame (7) form a complete high temperature gate.

2. The assembly method of the composite high-temperature damper for a high-temperature flue according to claim 1, characterized in that: The high temperature resistant module (6) involved in step (2) of the method is prefabricated from a polycrystalline fiber material, wherein the polycrystalline fiber is any one of polycrystalline ceramic fiber, polycrystalline mullite fiber, polycrystalline alumina fiber, and composite polycrystalline fiber.

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