Manhole cooling structure for boiler
By designing a cooling structure at the boiler manhole door and using cold air or cold air to flow through the annular air-cooled pipe, the problem of deformation and air leakage of manhole doors at high temperatures is solved, achieving higher sealing and safety.
Patent Information
- Application Number
- CN202422041950.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-21
AI Technical Summary
When the boiler is running, the manhole door is easily deformed by heat, resulting in a poor sealing, which may lead to high-temperature smoke leakage and cause burns or scalds.
Design a boiler manhole cooling structure, including heat insulation plugs, flexible heat insulation layer, annular air-cooled pipe, air inlet pipe and manhole door, which flows through the annular air-cooled pipe through cold air or cold air, cools the manhole door and increases the air pressure to ensure sealing.
It effectively reduces the temperature of the manhole door, prevents deformation and air leakage, improves the sealing of the manhole door, and ensures the safe operation of the boiler.
Smart Images
Figure CN223020246U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a cooling structure, in particular to a manhole cooling structure for a boiler, belonging to the technical field of boiler equipment. Background Art
[0002] The manhole of a boiler is a passage for people to enter the furnace when the boiler is shut down. When the boiler is in operation, the manhole needs to be locked and sealed by a manhole door, and its tightness must be ensured, without air leakage or smoke leakage. However, when the boiler is in operation, the internal flue gas temperature can be as high as over 1000 °C. At such a high temperature, the manhole door is easily deformed by heat, resulting in poor sealing of the manhole door. Especially when the boiler is operating under positive pressure, it is very easy for high-temperature flue gas to leak out from the manhole, which may lead to burn and scald incidents. Currently, each boiler manufacturer will lay castable inside the manhole door for heat insulation. However, when the boiler operates in a continuous high-temperature environment, the castable often cracks or even falls off due to heat.
[0003] In summary, how to propose a manhole cooling structure for the above technical problems has become an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model
[0004] Aiming at the above deficiencies of the prior art, the utility model provides a manhole cooling structure for a boiler.
[0005] The technical solution of the utility model is: a manhole cooling structure for a boiler, including a heat insulation plug, a flexible heat insulation layer, an annular air-cooling pipe, an air inlet pipe and a manhole door arranged coaxially in the manhole in sequence.
[0006] The manhole door is connected to the manhole by bolts, and a sealing gasket is clamped between the end faces of the manhole door and the manhole.
[0007] Flow guide grooves for gas flow are formed on the outer circumferential surface of the heat insulation plug, and both side surfaces of the flexible heat insulation layer are abutted against the heat insulation plug and the annular air-cooling pipe respectively.
[0008] The air inlet pipe passes through the outer wall of the manhole and is communicated with the annular air-cooling pipe. A plurality of air outlet holes are formed on the annular air-cooling pipe in a circumferential array manner, and an included angle β exists between the axis of the air outlet hole and the axis of the annular air-cooling pipe.
[0009] Further, the included angle β between the axis of the air outlet hole and the axis of the annular air-cooling pipe is 25° - 35°.
[0010] The utility model has the following effects compared with the prior art:
[0011] The structure of the utility model is simple. When the boiler is operating, cold air or the cold air of the boiler is introduced into the annular air-cooled pipe 300 through the air inlet pipe 320, ensuring that the temperature of the manhole door 100 is in a relatively low state and preventing it from being burned through or deformed, thus providing guarantee for the safe operation of the boiler. At the same time, the cold air or cold wind can increase the air pressure in the manhole 600. When the boiler is operating, the seal can still be maintained, ensuring that the flue gas in the furnace cannot leak out of the furnace, and improving the tightness of the manhole door 100. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is the exploded view of the utility model;
[0013] Figure 2 is the schematic diagram of the utility model arranged in the manhole 600;
[0014] Figure 3 is Figure 2 the partial enlarged view at I in
[0015] Figure 4 is the structural schematic diagram of the annular air-cooled pipe 300 and the air inlet pipe 320 of the utility model;
[0016] Figure 5 is Figure 4 the sectional view in the A direction in
[0017] In the figure: 100, manhole door; 200, gasket; 300, annular air-cooled pipe; 310, air outlet hole; 320, air inlet pipe; 400, flexible heat insulation layer; 500, heat insulation plug; 600, manhole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] In order to make the utility model purpose, features, and advantages of the utility model more obvious and understandable, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.
[0019] Detailed Embodiment 1: With reference to Figures 1 to 5 This embodiment is described. A manhole cooling structure for a boiler in this embodiment includes a heat insulation plug 500, a flexible heat insulation layer 400, an annular air-cooled pipe 300, an air inlet pipe 320, and a manhole door 100 that are coaxially arranged in sequence in the manhole 600.
[0020] The manhole door 100 is connected to the manhole 600 by bolts, and a gasket 200 is clamped between the end faces of the manhole door 100 and the manhole 600. With such a setting, the sealing performance of the manhole door 100 is improved.
[0021] Flow guiding grooves for gas flow are formed on the outer circumferential surface of the heat insulation plug 500, and both side surfaces of the flexible heat insulation layer 400 are in contact with the heat insulation plug 500 and the annular air-cooled pipe 300 respectively.
[0022] The air inlet pipe 320 passes through the outer wall of the manhole 600 and is connected to the annular air-cooling pipe 300. A plurality of air outlet holes 310 are formed in the annular air-cooling pipe 300 in a circumferential array, and there is an included angle β between the axis of the air outlet hole 310 and the axis of the annular air-cooling pipe 300.
[0023] Specific Embodiment 2: Figures 1 to 5 In this embodiment, the included angle β between the axis of the air outlet hole 310 and the axis of the annular air-cooling pipe 300 is 25° to 35°.
[0024] Furthermore, the diameter of the air outlet hole 310 is 6 mm.
[0025] Furthermore, the number of the air outlet holes 310 is 20 to 30, and preferably, it is set to 24.
[0026] Other compositions and connection relationships are the same as those in Specific Embodiment 1.
[0027] Specific Embodiment 3: Figures 1 to 5 In this embodiment, the material of the annular air-cooling pipe 300 is stainless steel. Preferably, the outer diameter of the annular air-cooling pipe 300 is 25 mm, and the wall thickness of the annular air-cooling pipe 300 is 2.5 mm. Other compositions and connection relationships are the same as those in Specific Embodiment 1 or 2.
[0028] Specific Embodiment 4: Figures 1 to 3 In this embodiment, the flexible heat insulation layer 400 is a layer of aluminum silicate fiber felt. With such a setting, the annular air-cooling pipe 300 and the manhole door 100 are protected from being burned through and deformed by the high-temperature flue gas in the furnace by virtue of the characteristics of low thermal conductivity and small heat capacity of the aluminum silicate fiber felt. Other compositions and connection relationships are the same as those in Specific Embodiments 1, 2 or 3.
[0029] Specific Embodiment 5: Figure 1 In this embodiment, a foldable handle is installed on the heat insulation plug 500. With such a setting, it is convenient for the installation and disassembly of the heat insulation plug 500.
[0030] Furthermore, the heat insulation plug 500 is a heat insulation plug made of refractory castable.
[0031] Other compositions and connection relationships are the same as those in Specific Embodiments 1, 2, 3 or 4.
[0032] Working Principle
[0033] When the boiler is in operation, cold air or the cold air of the boiler is introduced into the annular air-cooled pipe 300 through the air inlet pipe 320. The cold air or cold wind will continuously be discharged into the manhole 600 through the air outlet holes 310, and then flow through the flexible heat insulation layer 400 and the heat insulation plug into the boiler furnace. On the one hand, it cools the manhole door 100, ensuring that the manhole door 100 is at a relatively low temperature and will not be burned through and deformed by the high-temperature flue gas in the furnace. On the other hand, the cold air or cold wind can increase the air pressure in the manhole 600. When the boiler is in operation, it ensures that the flue gas in the furnace cannot leak out of the furnace, improving the tightness of the manhole door 100.
[0034] The present utility model has been disclosed in the above preferred embodiments, but it is not intended to limit the present utility model. Any person skilled in the art, without departing from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.
Claims
1. A manhole cooling structure for a boiler, characterized in that: It comprises a heat insulation plug (500), a flexible heat insulation layer (400), an annular air cooling pipe (300), an air inlet pipe (320) and a manhole door (100) which are coaxially arranged in sequence in a manhole (600); The manhole door (100) is connected to the manhole (600) by bolts, and a sealing gasket (200) is sandwiched between the end surfaces of the manhole door (100) and the manhole (600); The outer circumferential surface of the heat insulation plug (500) is provided with a guide groove for gas circulation, and the two side surfaces of the flexible heat insulation layer (400) are respectively against the heat insulation plug (500) and the annular air cooling pipe (300); The air inlet pipe (320) passes through the outer wall of the manhole (600) and is connected to the annular air cooling pipe (300). The annular air cooling pipe (300) is provided with a plurality of air outlet holes (310) in a circular array, and an angle β is formed between the axis of the air outlet holes (310) and the axis of the annular air cooling pipe (300).
2. A boiler manhole cooling structure according to claim 1, characterized in that: The angle β between the axis of the air outlet hole (310) and the axis of the annular air cooling pipe (300) is 25° to 35°.
3. A boiler manhole cooling structure according to claim 2, characterized in that: The diameter of the air outlet hole (310) is 6 mm.
4. A boiler manhole cooling structure according to claim 3, characterized in that: The number of the air outlet holes (310) is 20 to 30.
5. The boiler manhole cooling structure according to claim 1, characterized in that: The annular air cooling pipe (300) is made of stainless steel.
6. A boiler manhole cooling structure according to claim 1, characterized in that: The flexible heat-insulating layer (400) is an aluminum silicate fiber felt layer.
7. The boiler manhole cooling structure according to claim 1, characterized in that: The heat insulating plug (500) is provided with a foldable handle.
8. A boiler manhole cooling structure according to claim 7, characterized in that: The heat insulating plug (500) is a heat insulating plug made of refractory castable material.