Furnace cap and cooling system for vertical multi-fuel combustion furnace and vertical multi-fuel combustion furnace
By designing cylindrical channels, air guide plates and refractory linings on the furnace cap of the vertical mixing furnace, and combining the monitoring and control system of the thermocouple and low-voltage centrifugal fan, the high temperature problem of the furnace cap and the furnace body connection area is solved. , achieves cooling protection and structural stability, extends service life and reduces safety risks.
Patent Information
- Application Number
- CN202420319902.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-20
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-02-20
AI Technical Summary
The area connecting the furnace cap and furnace body of the vertical mixed furnace is prone to damage to the knotted material and burning through the shell, resulting in a short service life, great safety risks, and increased high-temperature deformation and environmental protection risks.
设计了一种包括主体、延伸部、柱形通道、导风板和耐材内衬的炉帽,结合低压离心风机和热电偶监测系统,通过导风板和耐材内衬增强冷却保护,形成 The low-temperature gas protection area has real-time temperature adjustment, and the extension is made of high-temperature creep performance.
It effectively extends the service life of the furnace cap, avoids high-temperature deformation and burn-through of the furnace body cone section, reduces safety risks, improves environmental protection performance, ensures stable temperature control, and significantly saves costs.
Smart Images
Figure CN222211277U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mixed-firing furnace protection, in particular to a furnace cap for a vertical mixed-firing furnace, a cooling system and the vertical mixed-firing furnace. Background Art
[0002] A mixed-firing furnace is a furnace equipment that provides a combustion environment for a single or multiple fuels and generates hot air. It mainly has two types, horizontal and vertical, and is widely used in industrial production. The connection area between the furnace cap and the furnace body of a multi-fuel vertical mixed-firing furnace frequently suffers from knotted refractory damage and shell burn-through. Inspection of the replaced furnace cap revealed that knotted refractory material also fell off the inside of the lower end of the furnace cap connected to the furnace body, and the steel shell was severely burned and deformed. Analysis shows that the main reasons are the high heat load in this area and the failure of protective measures. In order to increase the service life of the furnace cap and avoid environmental and safety risks caused by high-temperature deformation and burn-through of the furnace body, measures need to be taken to protect the above-mentioned areas. Utility Model Content
[0003] In view of this, in order to overcome at least one aspect of the above problems, an embodiment of the present utility model provides a furnace cap for a vertical mixed-firing furnace, comprising:
[0004] A main body, the main body being located outside the cone section of the furnace body of the mixed-firing furnace;
[0005] An extension portion, the extension portion being located inside the furnace shaft cone section;
[0006] A first cylindrical channel, the first cylindrical channel is arranged around the main body, including an air blast inlet extending from a side wall and an air blast outlet arranged at the bottom;
[0007] A second cylindrical channel, the second cylindrical channel is disposed around the main body and the extension portion, and includes an air guide inlet communicated with the air blast outlet, and an air guide outlet disposed on the opposite side of the air guide inlet;
[0008] A plurality of air guide plates are each arranged inside the second cylindrical channel and connected to the outer walls of the main body and the extension portion, and to the inner wall of the second cylindrical channel, thereby dividing the second cylindrical channel into a plurality of sub-channels.
[0009] In some embodiments, it also includes:
[0010] A refractory lining is built on the inner side of the extension portion.
[0011] In some embodiments, the refractory lining is one or more of 97 magnesium bricks, high alumina bricks, and silicon carbide bricks.
[0012] In some embodiments, a brick support ring is provided at the end of the extension portion to serve as a base for the refractory lining.
[0013] In some embodiments, the brick supporting ring is made by prefabricated welding or cold bending inner curling process.
[0014] In some embodiments, the extension portion is made of a material that is heat-resistant and resistant to high-temperature deformation.
[0015] In some embodiments, the angle between the wind guide plate and the horizontal direction of the wind direction is 25° to 70°.
[0016] In some embodiments, the first cylindrical channel further includes a partition plate, and the partition plate is disposed on the opposite side of the blast inlet.
[0017] Based on the same concept, according to another aspect of the utility model, an embodiment of the utility model further provides a cooling system, comprising a furnace cap as described in any of the above embodiments;
[0018] a thermocouple, used to monitor the temperature of an area near the end of the extension;
[0019] A low-pressure centrifugal fan, the outlet of which is connected to the blast inlet, and is used to adjust the air output according to the temperature monitored by the thermocouple.
[0020] Based on the same concept, according to another aspect of the utility model, an embodiment of the utility model further provides a vertical mixed-firing furnace, comprising a cooling system as described in the above embodiment.
[0021] The utility model has one of the following beneficial technical effects: the air guide plate extends from the second cylindrical channel to the end of the furnace cap extension part. First, the cold wind with orderly direction enhances the cooling protection of the outer side of the extension part. Second, the air guide plate acts as a "reinforcement rib" on the outer side of the extension part, stabilizing the structural state of the extension part. Third, more cold air directly reaches the space between the extension part and the furnace body cone section, forming a low-temperature gas protection area, thereby enhancing the protection of the furnace body from the side away from the high-temperature flue gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.
[0023] Figure 1 This is a schematic structural diagram of a furnace cap for a mixed-firing furnace according to an embodiment of the utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the air guide plate of an embodiment of the utility model;
[0025] Figure 3 It is a top view of the furnace cap according to an embodiment of the utility model. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.
[0027] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.
[0028] In order to improve the service life of a vertical mixed-firing furnace and eliminate potential safety hazards, the utility model proposes a furnace cap for a vertical mixed-firing furnace, comprising:
[0029] A main body 1, wherein the main body 1 is located outside the furnace cone section 5 of the mixed-firing furnace;
[0030] An extension portion 2, the extension portion 2 being located inside the furnace shaft cone section region 5;
[0031] A first cylindrical channel 3, which is disposed on the main body 1 in a surrounding manner and includes an air blast inlet 31 extending from a side wall and an air blast outlet disposed at the bottom;
[0032] A second cylindrical channel 4, which is disposed around the main body 1 and the extension portion 2, and includes an air guide inlet 41 connected to the air blast outlet, and an air guide outlet 42 disposed on the opposite side of the air guide inlet 41;
[0033] A plurality of air guide plates 9 are provided, each of which is disposed inside the second columnar channel 4 and connected to the outer walls of the main body 1 and the extension portion 2, as well as to the inner wall of the second columnar channel 4, thereby dividing the second columnar channel 4 into a plurality of sub-channels.
[0034] The solution proposed by the utility model extends the air guide plate 9 from the second cylindrical channel 4 to the end of the furnace cap extension part 2. Firstly, the cold wind with orderly direction enhances the cooling protection of the outer side of the extension part 2; secondly, the air guide plate 9 acts as a "reinforcement rib" on the outer side of the extension part 2 to stabilize the structural state of the extension part 2; thirdly, more cold wind directly reaches the space between the extension part 2 and the furnace body cone section to form a low-temperature gas protection area, thereby enhancing the protection of the furnace body from the side away from the high-temperature flue gas.
[0035] In some embodiments, it also includes:
[0036] A refractory lining 6 is built on the inner side of the extension portion 2 .
[0037] In some embodiments, the refractory lining 6 is one or more of 97 magnesium bricks, high alumina bricks, and silicon carbide bricks.
[0038] In some embodiments, a brick support ring 7 is provided at the end of the extension portion 2 to serve as a base for the refractory lining 6 .
[0039] In some embodiments, the brick supporting ring 7 is made by prefabricated welding or cold bending inner curling process.
[0040] Specifically, the width of the brick support ring 7 is 2 / 5 to 3 / 4 of the length of the refractory lining 6, preferably the width is 2 / 3 of the length of the refractory lining 6, and it is preferably made by cold bending inner curling process.
[0041] In some embodiments, the extension portion 2 is made of a material that is heat-resistant and resistant to high-temperature deformation.
[0042] Specifically, Figure 1 As shown, the length of the extension part 2 is the same as the height of the furnace body cone section 5, and can be made of heat-resistant and high-temperature deformation-resistant materials, preferably 1Cr25Ni20Si2. In this way, the extension part 2 uses a shaped refractory material with better high-temperature creep performance, which solves the problem of low strength and easy corrosion and peeling of knotted refractory materials, and enhances the protection of the extension part 2 from the side close to the high-temperature flue gas, thereby effectively protecting the furnace body cone section 5.
[0043] In some embodiments, the angle between the wind deflector 9 and the horizontal direction of the wind direction is 25° to 70°.
[0044] Specifically, Figure 2 As shown, the horizontal angle A between the wind deflector 9 and the wind direction can be 25° to 70°, preferably 45°; the thickness B of the wind deflector 9 is 5-12 mm, preferably 8 mm,
[0045] In some embodiments, the first cylindrical channel 3 further includes a partition plate 32 , and the partition plate 32 is disposed on the opposite side of the blast inlet 31 .
[0046] Specifically, Figure 3 As shown, a partition plate 32 is provided in the first cylindrical channel 3 to prevent the cold air from meeting at the far end of the blast inlet 31 and causing turbulence, thereby improving the cooling effect at the far end of the blast channel inlet.
[0047] Based on the same concept, according to another aspect of the utility model, an embodiment of the utility model further provides a cooling system, comprising a furnace cap as described in any of the above embodiments;
[0048] A thermocouple 8, used to monitor the temperature of the area near the end of the extension portion 2;
[0049] A low-pressure centrifugal fan, the outlet of which is connected to the blast inlet 31, and is used to adjust the air output according to the temperature monitored by the thermocouple.
[0050] Specifically, Figure 1 As shown, a thermocouple 8 can be arranged in the furnace body cone section 5 to monitor the temperature of the area near the end of the extension portion 2, and the monitored temperature can be linked to the air volume adjustment of the low-pressure centrifugal fan. When the temperature value of the thermocouple 8 rises at a rate exceeding 7°C / min or reaches 1020°C, the fan air volume increases.
[0051] In this way, the temperature of the furnace cap extension part 2 and the furnace body cone section area 5 is adjusted in real time to meet the control requirements through the "thermocouple monitoring + fan control" method, ensuring that the furnace body cone section is in a good working condition and effectively avoiding the failure of the hot blast furnace caused by excessive regional temperature.
[0052] Example:
[0053] Situation before implementation: The vertical mixed-firing furnace that did not adopt the furnace cap described in this application had the cone section of the furnace body exposed to high-temperature flue gas and flame for a long time, causing the cast refractory materials to fall off and the steel outer shell to burn through; the cast refractory materials inside the furnace cap fell off, the inner wall of the furnace cap deformed, and some areas were cracked, forcing it to be taken offline.
[0054] Implementation of the utility model: The furnace cap extension is made of 1Cr25Ni20Si2, which is equivalent to the height of the furnace body cone section (600mm), the width of the brick support ring is 133mm, and it is connected to the extension part by cold bending inner curling; the inner side of the extension part is built with high-aluminum bricks with a length of 200mm to the second columnar channel area. A partition plate is set in the first columnar channel, and an air guide plate is set in the second columnar channel, which extends to the end of the extension part at an angle of 45°. The thermocouple is inserted into the mixed-firing furnace from the middle of the furnace body cone section, and the distance between its detection point and the end of the extension part is 12mm.
[0055] Set a 4-72 type low-pressure centrifugal fan to blow air from the entrance of the air blast channel. When the temperature rise rate of the thermocouple reaches 10℃ / min, the fan air volume increases to strengthen the cooling of the extension. When the thermocouple temperature is stable or shows a downward trend, reduce the fan air volume.
[0056] Implementation effect: After the furnace cap device of this type was put into use, the temperature of the thermocouple was generally stable. After 10 months of use, there was no obvious abnormality in the brick support ring and the extension part, and the lining refractory of the extension part did not peel off or collapse. After 16 months of use, there was still no deformation of the extension part and burning of the furnace cone section.
[0057] In combination with the above embodiments, the vertical mixed-firing furnace cap design of the utility model has the following beneficial effects:
[0058] 1. The "thermocouple monitoring + fan control" method can adjust the temperature of the furnace cap extension and the furnace cone section in real time to meet the control requirements, ensure that the furnace cone section is in a good working condition, and effectively avoid the failure of the hot blast furnace caused by excessive regional temperature.
[0059] 2. The extension part adopts shaped refractory with better high-temperature creep performance, which solves the problem of low strength and easy corrosion and peeling of knotted refractory. It enhances the protection of the extension part from the side close to the high-temperature flue gas, thereby effectively protecting the cone section of the furnace body.
[0060] 3. The air guide plate extends from the second columnar channel to the end of the furnace cap extension. First, the orderly directional cold wind enhances the cooling protection of the outer side of the extension. Second, the air guide plate acts as a "reinforcement rib" on the outer side of the extension, stabilizing the structural state of the extension. Third, more cold air directly reaches the space between the extension and the furnace body cone section, forming a low-temperature gas protection zone, which enhances the protection of the furnace body from the side away from the high-temperature flue gas.
[0061] 4. A partition plate is arranged in the first cylindrical channel to prevent the cold air from meeting at the far end of the blast channel inlet and causing turbulence, thereby improving the cooling effect at the far end of the blast channel inlet.
[0062] 5. The service life of the furnace cap device of the present application is significantly extended, thereby saving costs.
[0063] The above are exemplary embodiments disclosed by the present utility model, but it should be noted that various changes and modifications can be made without departing from the scope of the present utility model disclosed by the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order.
[0064] It should be understood that, as used herein, the singular forms "a", "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations including one or more of the associated listed items.
[0065] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.
Claims
1. A furnace cap for a vertical mixed-firing furnace, characterized in that: include: A main body, the main body being located outside the cone section of the furnace body of the mixed-firing furnace; An extension portion, the extension portion being located inside the furnace shaft cone section; A first cylindrical channel, the first cylindrical channel is arranged around the main body, including an air blast inlet extending from a side wall and an air blast outlet arranged at the bottom; A second cylindrical channel, the second cylindrical channel is disposed around the main body and the extension portion, and includes an air guide inlet communicated with the air blast outlet, and an air guide outlet disposed on the opposite side of the air guide inlet; A plurality of air guide plates are each arranged inside the second cylindrical channel and connected to the outer walls of the main body and the extension portion, and to the inner wall of the second cylindrical channel, thereby dividing the second cylindrical channel into a plurality of sub-channels.
2. The furnace cap according to claim 1, characterized in that: Also includes: A refractory lining is built on the inner side of the extension portion.
3. The furnace cap according to claim 2, characterized in that: The refractory lining is one or more of 97 magnesium bricks, high alumina bricks, and silicon carbide bricks.
4. The furnace cap according to claim 2, characterized in that: A brick supporting ring is arranged at the end of the extension portion to serve as a base for the refractory lining.
5. The furnace cap according to claim 4, characterized in that: The brick supporting ring is made by prefabrication welding or cold bending inner curling process.
6. The furnace cap according to claim 1, characterized in that: The extension portion is made of a material that is heat-resistant and resistant to high-temperature deformation.
7. The furnace cap according to claim 1, characterized in that: The angle between the wind guide plate and the horizontal direction of the wind direction is 25° to 70°.
8. The furnace cap according to claim 1, characterized in that: The first cylindrical channel further includes a partition plate, and the partition plate is arranged on the opposite side of the blast inlet.
9. A cooling system, characterized in that: include: The furnace cap according to any one of claims 1 to 8; a thermocouple, used to monitor the temperature of an area near the end of the extension; A low-pressure centrifugal fan, the outlet of which is connected to the blast inlet, and is used to adjust the air output according to the temperature monitored by the thermocouple.
10. A vertical mixed-firing furnace, characterized in that: Comprising a cooling system as claimed in claim 9 above.