Spoiler for ash bucket of waste heat boiler
Through the combination of split design and oblique long holes, the problem of difficulty in replacing the integrated flow blocking plate and high-temperature expansion and deformation is solved, and the replacement is simplified and the service life is extended, ensuring the safety of the inner wall of the ash bucket.
Patent Information
- Application Number
- CN202420639876.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-30
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-03-30
AI Technical Summary
The existing integrated flow blocking plate is difficult to replace and is heat-expanded and deformed at high temperatures in the boiler furnace, resulting in damage to the ash bucket membrane wall.
Multiple flow blocking plates designed in split type, and there is a gap during installation to avoid damage caused by heat expansion. The fixing plate is welded to the inner wall of the ash bucket to simplify the replacement process, and the oblique long hole design is used to prevent expansion and drive the top of the fixing plate. damage.
It reduces the difficulty of replacing the flow blocking plate, improves installation safety, extends service life, and avoids damage to the inner wall of the boiler.
Smart Images
Figure CN222335411U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boiler equipment, and in particular relates to a baffle plate used for an ash hopper of a waste heat boiler. Background Art
[0002] With the development of metallurgical technology, the cooling method of non-ferrous metallurgical furnaces has gradually replaced general water cooling with vaporization cooling. The steam generated by vaporization cooling can be used for production and life, thereby improving the thermal utilization rate of the furnace. Industrial flue gas has a large dust content, generally 60-120g / m³. SO2, SO3 in the flue gas and various metal and non-metal elements contained in the smoke or slag will cause high-temperature corrosion and low-temperature corrosion.
[0003] In the production process of modern industrial furnaces, industrial waste heat boilers are mostly used for flue gas cooling and dust removal and waste heat utilization. The boiler ash hopper is used as a place for process flue gas dust reduction and ash capture. It is generally set below the slag condensation tube screen (convection tube bundle) of the boiler body. In order to prevent the flue gas from going through the boiler ash hopper channel and bypassing the slag condensation tube screen (convection tube bundle) to reduce the effect of boiler heat exchange and dust reduction, it is necessary to set a baffle in the boiler ash hopper in front of the slag condensation tube screen (convection tube bundle). The ash hopper baffle will guide the process flue gas dust and the waste heat boiler slag condensation tube screen (convection tube bundle) to fully exchange heat and reduce dust. Boiler manufacturing units mostly use membrane wall structure baffles. Affected by the sulfur-containing wet ash in the ash hopper and the mechanical cleaning of the boiler tube bundle, the membrane wall baffle has a high probability of corrosion and mechanical damage, and a relatively short life. The later replacement is limited by the diameter of the manhole door channel, and the overall replacement is difficult. In addition, the baffle is heated and expanded and deformed in the face of the high temperature of the boiler furnace, resulting in damage to the ash hopper membrane wall. Summary of the invention
[0004] The utility model aims to solve the problems that the existing integral baffle is difficult to replace and the baffle expands and deforms when facing the high temperature of the boiler furnace, resulting in damage to the membrane wall of the ash hopper. A baffle for the ash hopper of a waste heat boiler is provided. The multiple baffles with a split design effectively reduce the difficulty of replacement. During installation, the gap between the baffle and the inner wall of the ash hopper serves as the expansion margin of the baffle, which effectively avoids damage to the membrane wall of the ash hopper due to thermal expansion.
[0005] In order to achieve the above purpose, the technical solution of the utility model is:
[0006] A baffle plate for an ash hopper of a waste heat boiler is arranged between two relatively inclined inner walls of the ash hopper and below a convection tube bundle arranged above the ash hopper, comprising a plurality of fixing components and baffle plates, wherein a plurality of the fixing components are arranged in an array in the ash hopper, and each fixing component comprises two fixing plates, wherein the two fixing plates are respectively fixedly arranged on two relatively inner walls of the ash hopper, and a plurality of connecting plates are fixedly arranged on each fixing plate, wherein a first mounting hole is arranged on the connecting plate, and a plurality of baffle plates are arranged between the two fixing plates, wherein second mounting holes corresponding to the first mounting holes are arranged at both ends of the baffle plates, and the baffle plates are fixedly connected to the corresponding connecting plates by bolts, and the bolts are fixed by nuts after passing through the corresponding first mounting holes and second mounting holes, and the plurality of baffle plates arranged in a split manner are more convenient for replacement and disassembly.
[0007] The first mounting hole or the second mounting hole is an oblique long hole, there are gaps between both ends of the baffle and the inner wall of the ash hopper, and there is a gap between the upper end of the baffle and the lower end of the convection tube bundle. The mounting hole designed with oblique long holes can prevent the baffle from expanding due to heat and driving the fixing plate to press against the inner wall of the ash hopper, causing damage to the inner wall of the ash hopper.
[0008] Preferably, the ash hopper is a membrane wall structure, and the fixing plate is welded and fixed to the fins of the membrane wall of the ash hopper, and the installation construction does not involve the modification of pressure-bearing components such as tube bundles.
[0009] Preferably, a plurality of manhole doors are provided on the side of the ash hopper, and the baffle enters the ash hopper through the manhole doors, so as to facilitate replacement.
[0010] Preferably, there are three baffles corresponding to each set of fixed plates, and all of them are trapezoidal plates. The widths of the three corresponding baffles decrease from top to bottom, so that the distances between their two ends and the inner wall of the ash hopper are equal, ensuring the baffle's blocking effect on smoke.
[0011] Preferably, a flue gas inlet is arranged at one side of the convection tube bundle, and an electrostatic precipitator is arranged at the flue gas outlet at the other end, and the flue gas is processed by the electrostatic precipitator after absorbing waste heat through the convection tube bundle.
[0012] Through the above technical solution, the beneficial effects of the utility model are:
[0013] 1. The utility model reduces the size of a single spoiler by designing the spoiler in a split type, making it easier for each spoiler assembly to enter the boiler cavity through a manhole door and then be assembled, thereby reducing the difficulty of installing the spoiler.
[0014] 2. The utility model fixes the baffle plate through a fixing plate, and the fixing plate is directly welded to the fins of the inner wall (membrane wall) of the ash hopper. The installation and construction does not involve the modification of pressure-bearing components such as the tube bundle, and the qualification requirements for the construction team are not high, and the safety is relatively high.
[0015] 3. The baffle of the utility model is fixed by oblique long holes, and gaps are left at both ends and the top of the baffle as its expansion margin. Under the high temperature of the boiler furnace, the baffle has space for thermal expansion and deformation, and its extension upward and on both sides is not restricted, and will not cause damage to the inner wall (membrane wall) of the ash hopper. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the installation structure of the utility model.
[0017] Figure 2 It is a structural schematic diagram of the utility model.
[0018] Figure 3 It is a structural schematic diagram of the spoiler of the utility model.
[0019] Figure 4 It is a structural schematic diagram of the fixing plate and the connecting plate of the utility model.
[0020] The numbers in the attached drawings are: 1 is an ash hopper, 2 is a convection tube bundle, 3 is a fixing plate, 4 is a connecting plate, 5 is a baffle, 6 is a first mounting hole, 7 is a second mounting hole, 8 is a manhole door, 9 is a flue gas inlet, and 10 is an electrostatic precipitator. DETAILED DESCRIPTION
[0021] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:
[0022] like Figure 1 to Figure 4 As shown, this embodiment provides a baffle plate for a waste heat boiler ash hopper, which is arranged between two relatively inclined inner walls of the ash hopper 1 and below the convection tube bundle 2 arranged above the ash hopper 1, to ensure the truncation of the flue gas channel in the ash hopper 1 and to ensure that the flue gas flows along the position where the convection tube bundle 2 is located, including a plurality of fixing components and baffle plates 5, and the baffle plates 5 are fixed by the fixing components. The plurality of fixing components are arranged in an array in the ash hopper 1, and each fixing component includes two fixing plates 3, and the two fixing plates 3 are respectively fixed on the two relatively inner walls of the ash hopper 1, and each fixing plate 3 A plurality of connecting plates 4 are fixedly arranged on the top, and a first mounting hole 6 is provided on the connecting plate 4. A plurality of baffles 5 are arranged between the two fixed plates 3. The baffles 5 block the flue gas entering the ash hopper 1 so that the flue gas can only move upward along the convection tube bundle 2 to ensure the heat exchange effect of the convection tube bundle 2. Second mounting holes 7 corresponding to the first mounting holes 6 are provided at both ends of the baffles 5. The baffles 5 are fixedly connected to the corresponding connecting plates 4 by bolts. The bolts pass through the corresponding first mounting holes 6 and the second mounting holes 7 and are fixed by nuts to achieve the installation and fixation of the baffles 5.
[0023] The fixing plate 3, the connecting plate 4, the bolts of the spoiler 5, etc. are all supported by 304 stainless steel, which has strong corrosion resistance to high-temperature flue gas and sulfur-containing dust and a long service life. The leeward side of the spoiler 5 is reinforced with vertical ribs, and the windward side has obvious advantages in dust-proof ability and strength.
[0024] The first mounting hole 6 or the second mounting hole 7 is an oblique long hole, that is, when the first mounting hole 6 is an oblique long hole, the second mounting hole 7 can be an oblique long hole or a round hole, and when the second mounting hole 7 is an oblique long hole, the first mounting hole 6 can be an oblique long hole or a round hole. There are gaps between both ends of the baffle plate 5 and the inner wall of the ash hopper 1, and the spacing between both ends of the baffle plate 5 and the inner wall of the ash hopper 1 is 30 mm. There is a gap between the upper end of the baffle plate 5 and the lower end of the convection tube bundle 2, and the spacing between the upper end of the baffle plate 5 and the lower end of the convection tube bundle 2 is 200 mm, so as to ensure that when the baffle plate 5 expands at high temperature, the bolt moves along the oblique long hole to avoid driving the fixing plate 3 to move and press to damage the inner wall (membrane wall) of the ash hopper 1.
[0025] The ash hopper 1 is a membrane wall structure, and the fixing plate 3 is welded and fixed on the fins of the membrane wall of the ash hopper 1. The installation and construction of the spoiler 5 does not involve the modification of pressure-bearing components such as the tube bundle, and the qualification requirements for the construction team are not high, and the safety is relatively high.
[0026] A plurality of manhole doors 8 are arranged on the side of the ash hopper 1 , and the width of the spoiler 5 at the widest position is smaller than the diagonal length of the manhole door 8 . The spoiler 5 and fixing components that need to be replaced are delivered into the boiler ash hopper 1 through the manhole door 8 .
[0027] There are three spoiler plates 5 corresponding to each set of fixed plates 3, and all of them are trapezoidal plates. The spoiler plates 5 with a trapezoidal plate structure ensure that both ends are parallel to the inner wall of the ash hopper 1. The widths of the three corresponding spoiler plates 5 decrease from top to bottom, so that the distances between their two ends and the inner wall of the ash hopper 1 are equal, ensuring the rationality of the structure and facilitating installation and replacement.
[0028] A flue gas inlet 9 is arranged at one side of the convection tube bundle 2, and an electrostatic precipitator 10 is arranged at the flue gas outlet at the other end. The flue gas enters the area above the ash hopper 1 of the boiler from the flue gas inlet 9, and after sufficient contact and heat exchange with the convection tube bundle 2, it enters the electrostatic precipitator 10 for subsequent treatment, thereby effectively ensuring the heat utilization of the flue gas.
[0029] When in use, the flue gas enters the area above the ash hopper 1 of the boiler from the flue gas inlet 9, and is fully contacted with the convection tube bundle 2 for heat exchange. During this process, the flue gas entering the ash hopper 1 is blocked by the baffle 5, so that it can only rise to fully exchange heat with the convection tube bundle 2, thereby avoiding heat waste of the flue gas and reducing the heat exchange effect. Finally, after sufficient heat exchange with the convection tube bundle 2, the flue gas flows out to the electrostatic precipitator 10 for subsequent treatment.
[0030] During the use of the baffle plate 5, the baffle plate 5 is heated by the high temperature of the boiler furnace, and will expand and deform upward and on both sides. On the one hand, space is left above and on both sides of the baffle plate 5. On the other hand, the expanded and deformed part of the baffle plate 5 moves to both sides in the oblique long hole with the bolts, effectively avoiding the baffle plate 5 from contacting with the lower end of the convection tube bundle 2 to cause wear, and the two ends of the baffle plate 5 continue to deform after contacting the inner wall (membrane wall) of the ash hopper 1, causing damage to the membrane wall.
[0031] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.
Claims
1. A baffle for a waste heat boiler ash hopper, arranged between two relatively inclined inner walls of the ash hopper (1) and below a convection tube bundle (2) arranged above the ash hopper (1), characterized in that: The invention comprises a plurality of fixing components and a baffle plate (5), wherein the plurality of fixing components are arranged in an array in an ash hopper (1), each fixing component comprises two fixing plates (3), the two fixing plates (3) are respectively fixedly arranged on two opposite inner walls of the ash hopper (1), a plurality of connecting plates (4) are fixedly arranged on each fixing plate (3), a first mounting hole (6) is provided on the connecting plate (4), a plurality of baffle plates (5) are arranged between the two fixing plates (3), a second mounting hole (7) corresponding to the first mounting hole (6) is provided at both ends of the baffle plate (5), and the baffle plate (5) is fixedly connected to the corresponding connecting plate (4) by means of bolts, and the bolts pass through the corresponding first mounting hole (6) and the second mounting hole (7) and are fixed by nuts; The first mounting hole (6) or the second mounting hole (7) is an oblique long hole, there are gaps between both ends of the baffle plate (5) and the inner wall of the ash hopper (1), and there is a gap between the upper end of the baffle plate (5) and the lower end of the convection tube bundle (2).
2. The baffle plate for the waste heat boiler ash hopper according to claim 1, characterized in that: The ash hopper (1) is a membrane wall structure, and the fixing plate (3) is welded and fixed on the fins of the membrane wall of the ash hopper (1).
3. The baffle plate for the waste heat boiler ash hopper according to claim 1, characterized in that: A plurality of manhole doors (8) are arranged on the side of the ash hopper (1).
4. The baffle plate for the waste heat boiler ash hopper according to claim 1, characterized in that: Each set of fixed plates (3) corresponds to three baffles (5), all of which are trapezoidal plates. The widths of the three baffles (5) corresponding to the upper and lower parts decrease from top to bottom, so that the distances between their two ends and the inner wall of the ash hopper (1) are equal.
5. The baffle plate for the waste heat boiler ash hopper according to claim 1, characterized in that: A flue gas inlet (9) is provided at one side of the convection tube bundle (2), and an electrostatic precipitator (10) is provided at the flue gas outlet at the other end.