Auxiliary air inlet structure of heating mantle

Abstract

The invention relates to the technical field of steel rolling heat treatment, in particular to a heating mantle auxiliary air inlet structure and adjusting mechanism which comprises a heating smoke pipe and a movable sleeve arranged on the outer wall of the heating smoke pipe in a sleeving mode. The stabilizing mechanism comprises a supporting piece fixedly arranged at the bottom of the movable sleeve and a positioning piece connected to the bottom of the heating smoke pipe. A certain distance is reserved between the furnace platform smoke pipeline platform and the heating cover smoke pipe lower end flange, the movable sleeve is installed below the furnace platform smoke pipeline platform and the heating cover smoke pipe lower end flange, the air inlet is formed, cold air enters the negative pressure smoke pipe, the smoke temperature is effectively reduced, potential safety hazards caused by high temperature are prevented, the cold air is introduced through the air inlet, the gas flow is increased, and the energy consumption is reduced. The exhaust speed of the smoke is reduced, the residence time of the smoke in the heating cover is prolonged, the smoke makes full contact with the heating cover, the heat utilization rate is improved, and energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling steel heat treatment, and in particular to an auxiliary air inlet structure for a heating hood. Background Art

[0002] The heating hood flue pipe is a pipe required for the exhaust of the tail gas after combustion of the heating hood of a bell-type annealing furnace. Its function is to discharge the high-temperature flue gas into the negative pressure main pipe and finally discharge it into the atmosphere through the chimney. However, in existing old equipment, the high-temperature flue gas will cause the temperature to rise at the negative pressure main pipe and the exhaust fan, bringing potential safety hazards and shortening the service life of the motor. The high-temperature flue gas is quickly exhausted, resulting in a short residence time of the flue gas in the heating hood, low heat utilization rate, and energy waste. The flue gas monitoring and sampling port is close to the air inlet, and it is easily affected by the intrusion of air, resulting in inaccurate data, which affects the control of the heating process and the evaluation of product quality.

[0003] Some newly established factories have put into use a new equipment system and use the high-temperature detection frequency reduction function of the new system to improve safety. However, it is difficult for old factories with a large number of old equipment to comprehensively replace the new equipment due to the high cost.

[0004] Therefore, there is a need for an auxiliary air inlet structure for a heating hood that can effectively reduce potential safety hazards, improve thermal efficiency and data accuracy, has a simple structure, and is easy to implement to meet the needs of the existing environment. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, the abstract of the specification and the title of the invention of this application to avoid obscuring the purpose of this part, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above-mentioned prior art, in old equipment, the high-temperature flue gas will cause the temperature to rise at the negative pressure main pipe and the exhaust fan, bringing potential safety hazards, shortening the service life of the motor, the high-temperature flue gas is quickly exhausted, resulting in a short residence time of the flue gas in the heating hood, low heat utilization rate, energy waste, the flue gas monitoring and sampling port is close to the air inlet, and it is easily affected by the intrusion of air, resulting in inaccurate data, and the high cost of replacing new equipment.

[0007] Therefore, the technical problem to be solved by the present invention is to design an auxiliary air inlet structure for a heating hood that can effectively reduce potential safety hazards, improve thermal efficiency and data accuracy, has a simple structure, and is easy to implement to meet the needs of the existing environment.

[0008] To solve the above technical problems, the present invention provides the following technical solution: An auxiliary air inlet structure for a heating hood, comprising

[0009] Adjusting mechanism, including a heating cigarette tube and a movable sleeve sleeved on the outer wall of the heating cigarette tube;

[0010] Stabilizing mechanism, including a support member fixedly arranged at the bottom of the movable sleeve and a positioning member connected to the bottom of the heating cigarette tube.

[0011] As an improvement of the present invention,

[0012] A limiting disc is fixedly arranged on the inner wall of the movable sleeve, and a receiving hole is formed at the center of the limiting disc;

[0013] The heating cigarette tube passes through the receiving hole, and the size of the receiving hole is the same as the size of the outer wall of the heating cigarette tube.

[0014] As an improvement of the present invention,

[0015] The inner wall size of the movable sleeve is equal to the outer wall size of the positioning member;

[0016] The movable sleeve slides along the outer wall of the heating cigarette tube.

[0017] As an improvement of the present invention,

[0018] A furnace platform cigarette tube is fixedly arranged below the heating cigarette tube;

[0019] A support member is fixedly arranged at the top of the furnace platform cigarette tube, and the support member contacts the support member.

[0020] As an improvement of the present invention,

[0021] The movable sleeve sleeves the heating cigarette tube and the furnace platform cigarette tube;

[0022] The length of the movable sleeve is at least twice the distance between the heating cigarette tube and the furnace platform cigarette tube.

[0023] As an improvement of the present invention,

[0024] The number of the support members is not less than 3 and is symmetrically arranged;

[0025] The height of the support member is not less than 10 mm and the material hardness is not less than the material hardness of the movable sleeve.

[0026] As an improvement of the present invention,

[0027] A sampling port is fixedly formed on the outer wall of the heating cigarette tube;

[0028] A sampling tube is fixedly installed on the surface of the sampling port, and the length of the sampling tube does not exceed 150 mm and the diameter is 10 - 30 mm.

[0029] As an improvement of the present invention,

[0030] The height of the sampling port is not less than 500 mm from the positioning part;

[0031] The bottom of the furnace platform flue pipe is fixedly connected through the negative pressure flue pipe.

[0032] The beneficial effects of the present invention are as follows: There is a certain distance between the furnace platform flue pipe platform and the lower flange of the heating hood flue pipe, and a movable sleeve is installed below to form an air inlet, so that cold air enters the negative pressure flue pipe, effectively reducing the flue gas temperature and preventing safety hazards caused by high temperature. By introducing cold air through the air inlet, the gas flow rate is increased, the rate of the flue gas being drawn away is reduced, the residence time of the flue gas in the heating hood is prolonged, the flue gas is fully contacted with the heating hood, the heat utilization rate is improved, and energy is saved. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0034] Figure 1 It is a schematic plan view of the auxiliary air inlet structure of the heating hood in the present invention.

[0035] Figure 2 It is a schematic diagram of the upper and lower structure cooperation of the auxiliary air inlet structure of the heating hood in the present invention.

[0036] Figure 3 It is a plan view of the upper and lower structure cooperation of the auxiliary air inlet structure of the heating hood in the present invention.

[0037] Figure 4 It is a partial cross-sectional view of the auxiliary air inlet structure of the heating hood in the present invention. Detailed Embodiments

[0038] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention in conjunction with the drawings of the specification.

[0039] Embodiment 1

[0040] Refer to Figure 1 , this embodiment provides an auxiliary air inlet structure for a heating hood.

[0041] The adjusting mechanism 1 includes a heating flue pipe 11 and a movable sleeve 12. The heating flue pipe 11 is a circular carbon steel pipe made of Q235B material, with a diameter of 300 mm and a wall thickness of 10 mm. This flue pipe is used to discharge the high-temperature flue gas after combustion in the heating hood into the negative pressure main pipe.

[0042] The movable sleeve 12 is made of a circular carbon steel pipe with the same material as the heating flue pipe, and its length is at least twice the distance between the 3 platforms of the furnace table flue pipe and the lower flange of the heating flue pipe 11. The inner diameter of the movable sleeve 12 is equal to the outer diameter of the lower flange of the heating flue pipe 11, and the outer diameter is greater than or equal to the outer diameter of the flange welded to the 3 platforms of the furnace table flue pipe 3. A flange is welded to the upper end of the movable sleeve 12, and the inner wall of the movable sleeve 12 is welded to the outer ring of the flange. So that the movable sleeve 12 can be sleeved on the heating flue pipe 11. A support member 21 is welded to the lower end of the movable sleeve 12, which is used to support the movable sleeve 12 and keep it stable.

[0043] The stabilizing mechanism 2 includes a support member 21 and a positioning member 22. The number of support members 21 is at least three and they are evenly distributed at the bottom of the movable sleeve. The height of the support member 21 is not less than 10 mm, and the width and length are appropriate to ensure its strength and stability. The material of the support member 21 is not lower than that of the movable sleeve 12 to prevent it from deforming during production and use. The positioning member 22 is made of a circular carbon steel flange with the same material as the heating flue pipe and is welded to the bottom of the heating flue pipe. The size of the positioning member 22 matches the size of the flange of the furnace table flue pipe to ensure the centering and correction of the heating flue pipe 11 and the 3 platforms of the furnace table flue pipe and keep it stable.

[0044] Put the flange on the inner wall of the movable sleeve 12 on the heating flue pipe 11 and ensure it slides and fits with the outer wall of the heating flue pipe 11. The lower flange of the heating flue pipe 11 is welded to the bottom of the heating flue pipe 11. After the movable sleeve 12 passes through the lower flange of the heating flue pipe 11, the lower flange of the heating flue pipe 11 can play a limiting role. After the movable sleeve 12 slides down along the heating flue pipe 11, its movement can be restricted by the lower flange of the heating flue pipe 11, ensuring the safe movement range of the movable sleeve 12.

[0045] The support members 21 are evenly welded to the bottom of the movable sleeve 12, and the positioning member 22 is welded to the bottom of the heating flue pipe 11, and ensure the centering of the heating flue pipe 11 and the flange of the furnace table flue pipe 3. Place the heating flue pipe 11 on the 3 platforms of the furnace table flue pipe and adjust the length of the movable sleeve 12 so that there is a certain distance between the movable sleeve 12 and the furnace table flue pipe 3, and at the same time, centering and correction are carried out.

[0046] When the heating hood burns to generate high-temperature flue gas, the flue gas will be discharged into the negative-pressure flue pipe 4 through the heating flue pipe 11. Due to the existence of the movable sleeve 12, part of the cold air will enter the negative-pressure flue pipe 4, thereby reducing the pipe temperature at the negative-pressure flue pipe 4 and the exhaust fan, and preventing safety accidents caused by high temperature. The entry of cold air will increase the gas flow rate and reduce the rate at which the flue gas of the heating hood is drawn away, making the high-temperature flue gas stay in the heating hood for a longer time, thereby improving the thermal utilization rate of the flue gas of the heating hood.

[0047] Embodiment 2

[0048] Refer to Figures 1 to 3, This embodiment is based on the previous embodiment, and what is different from the previous embodiment is:

[0049] The heating flue 11 is made of circular carbon steel pipe with the material of Q235B, the diameter is 300mm, and the wall thickness is 10mm, which is used to discharge the high-temperature flue gas from the heating hood. The furnace platform flue 3 is made of high-temperature resistant material, such as carbon steel, the inner diameter is 400mm, and the wall thickness is 10mm, which is connected to the negative pressure flue and is used to extract the flue gas.

[0050] The outer diameter of the movable sleeve 12 is the same as the inner diameter of the furnace platform flue, and the inner diameter is the same as the outer diameter of the heating flue 11. A limiting disc 121 is fixedly arranged on its inner wall, and a receiving hole 1211 is opened at the center of the limiting disc 121. The size of the receiving hole 1211 is the same as the outer wall size of the heating flue 11.

[0051] A limiting disc 121 is fixedly arranged on the inner wall of the movable sleeve 12. The limiting disc 121 can use a flange with corresponding size. The limiting disc 121 is used to limit the moving range of the movable sleeve 12 to ensure that the movable sleeve 12 always maintains a certain distance from the heating flue 11 and the furnace platform flue 3. The receiving hole 1211 allows the heating flue 11 to pass through and at the same time ensures the sealing between the movable sleeve 12 and the heating flue 11. The inner wall size of the movable sleeve 12 is the same as the outer wall size of the positioning member 22, allowing the movable sleeve 12 to slide along the outer wall of the heating flue 11 for adjustment as needed.

[0052] The furnace platform flue 3 is fixedly arranged below the heating flue 11. A support member 31 is fixedly arranged at the top of the furnace platform flue 3. The support member 31 itself can also be a flange with corresponding size. The upper part of the support member 31 needs to contact the support member 21 to play a role of limiting and supporting.

[0053] The length of the movable sleeve 12 is at least twice the distance between the platform of the furnace platform flue 3 and the lower flange of the heating flue, ensuring that there is enough sliding space and it can adapt to equipment with different height intervals.

[0054] When the heating hood burns to generate high-temperature flue gas, the flue gas is discharged through the heating flue 11 and enters the movable sleeve 12. Due to the relatively long length of the movable sleeve 12, the residence time of the flue gas in the sleeve increases, and the heat is fully released, thereby reducing the temperature of the flue gas. At the same time, there is a certain distance between the lower end of the movable sleeve 12 and the furnace platform flue 3 through the action of the support member 21, allowing cold air to enter the sleeve to further reduce the temperature of the flue gas. In addition, the setting of the movable sleeve 12 also slows down the rate at which the flue gas is extracted, making the flue gas stay in the heating hood for a longer time and improving the thermal utilization rate.

[0055] Embodiment 3

[0056] Refer to Figures 1 to 4, This embodiment is based on the previous embodiment, and what is different from the previous embodiment is that:

[0057] The number of the support members 21 is not less than 3, and a plurality of symmetrically arranged support members 21 can disperse the pressure received by the movable sleeve 12 more evenly, avoiding deformation or damage caused by a single support member 21 bearing too much force, thereby improving the stability of the overall structure. The symmetrically arranged support members 21 can effectively resist torsion, prevent the movable sleeve 12 from twisting when subjected to external forces, maintain its vertical state, and ensure the stability of the air inlet. The material hardness of the support members 21 is not less than that of the movable sleeve 12, which can ensure that the support members will not break or be damaged easily when subjected to external forces, thus avoiding potential safety hazards. A height of 10 mm can ensure the air inflow efficiency.

[0058] The sampling port 13 is opened on the outer wall of the heating cigarette pipe 11 for collecting flue gas samples, and its position height is not less than 500 mm from the positioning member 22. The sampling pipe 131 is used to connect the sampling port and is used to introduce the flue gas sample into a flue gas analyzer or other detection equipment. Its length does not exceed 150 mm, and the diameter is 10 - 30 mm.

[0059] Different valves can be set outside the sampling pipe 131 to meet the needs of the existing environment. Open the valves according to requirements to detect the parameters of the flue gas samples.

[0060] The technical solution of the present invention forms an air duct through the support members 21 with a height of 10 mm to cool the incoming air, effectively reducing the temperature of the negative pressure cigarette pipe and the exhaust fan, improving the safety and service life of the equipment. The incoming air reduces the rate at which the flue gas is drawn away, enabling the high-temperature flue gas to stay in the heating hood for a longer time, improving the thermal efficiency. The position of the sampling port 13 is far from the air inlet, avoiding air from entering the sampling pipe and improving the analysis accuracy of the flue gas components.

[0061] The bottom of the furnace platform cigarette pipe 3 is fixedly and through-connected to the negative pressure cigarette pipe 4. The bottom of the furnace platform cigarette pipe 3 and the negative pressure cigarette pipe 4 are fixedly and through-connected in a way, usually by welding or other reliable connection methods, to ensure good sealing at the connection and prevent flue gas leakage.

[0062] The high-temperature flue gas generated by the combustion of the heating hood body is discharged through the heating cigarette pipe and enters the furnace platform cigarette pipe 3. The negative pressure cigarette pipe 4 generates negative pressure through the exhaust fan, extracts the flue gas in the furnace platform cigarette pipe 3, and finally discharges it into the atmosphere. Due to the suction effect of the negative pressure cigarette pipe 4, air is also drawn into the space between the movable sleeve 12 and the furnace platform cigarette pipe 3 and mixed with the high-temperature flue gas to reduce the flue gas temperature.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A heating hood auxiliary air inlet structure, characterized in that: include, The regulating mechanism (1) comprises a heating smoke pipe (11) and a movable sleeve (12) sleeved on the outer wall of the heating smoke pipe (11); The stabilizing mechanism (2) comprises a support member (21) fixedly arranged at the bottom of the movable sleeve (11) and a positioning member (22) connected to the bottom of the heating smoke pipe (11).

2. The auxiliary air inlet structure of the heating cover according to claim 1, characterized in that: A limiting plate (121) is fixedly arranged on the inner wall of the movable sleeve (12), and a receiving hole (1211) is provided at the center of the limiting plate (121); The heating smoke pipe (11) passes through the accommodating hole (1211), and the size of the accommodating hole (1211) is the same as the size of the outer wall of the heating smoke pipe (11).

3. The auxiliary air inlet structure of the heating cover according to claim 1, characterized in that: The inner wall size of the movable sleeve (12) is equal to the outer wall size of the positioning member (22); The movable sleeve (12) slides along the outer wall of the heating smoke pipe (11).

4. The auxiliary air inlet structure of the heating cover according to claim 3 is characterized in that: A furnace smoke pipe (3) is fixedly arranged below the heating smoke pipe (11); A support member (31) is fixedly arranged on the top of the stove top smoke pipe (3), and the support member (31) contacts the support member (21).

5. The auxiliary air inlet structure of the heating cover according to any one of claims 1 to 4, characterized in that: The movable sleeve (12) sleeves the heating smoke pipe (11) and the stove smoke pipe (3); The length of the movable sleeve (12) is at least twice the distance between the heating smoke pipe (11) and the stove smoke pipe (3).

6. The auxiliary air inlet structure of the heating cover according to claim 5, characterized in that: The number of the support members (21) is not less than 3 and they are symmetrically arranged; The support member (21) has a height of not less than 10 mm and a material hardness not less than the material hardness of the movable sleeve (12).

7. The auxiliary air inlet structure of the heating cover according to claim 6, characterized in that: A sampling port (13) is fixedly provided on the outer wall of the heating smoke pipe (11); A sampling tube (131) is fixedly mounted on the surface of the sampling port (13); the sampling tube (131) has a length not exceeding 150 mm and a diameter of 10 to 30 mm.

8. The auxiliary air inlet structure of the heating cover according to claim 7, characterized in that: The sampling port (13) is located at a height not less than 500 mm from the positioning member (22); The bottom of the stove top smoke pipe (3) is fixedly connected to the negative pressure smoke pipe (4).

Images