Annealing furnace low-nitrogen combustion system

Abstract

The utility model discloses an annealing furnace low nitrogen combustion system, including the fan that the burner main part is connected with the gas outlet, still include the casing of tubulose, the outer periphery of casing is provided with the air extraction port and the air jet, and the air extraction port is linked with the air inlet of fan, the inside coaxial rotation of casing is provided with the filter screen of tubulose, and both ends of filter screen are sealedly connected with casing, and the outer periphery of filter screen is distributed with at least three sealing strips extending along its axial direction, and sealing strip is slidably connected with casing, and the spacing between two adjacent sealing strips is less than the minimum spacing between the air extraction port and the air jet along the circumference of casing. The utility model discloses filter screen rotates, and the airflow that sprays at the air jet carries out reverse flushing to filter screen, makes the dust and particulate matter that accumulated on filter screen fall off, and through the sustained cleaning to filter screen, can make filter screen keep clean, improve the purification effect of filter screen to low nitrogen burner air inlet, improve the working efficiency of low nitrogen burner.

Description

Technical Field

[0001] This utility model belongs to the field of low-NOx burner technology, and in particular relates to a low-NOx combustion system for an annealing furnace. Background Technology

[0002] Low-NOx burners employ premixed combustion technology, which involves mixing fuel and air evenly before combustion. By premixing fuel and air, the fuel can be completely burned, reducing unburned fuel residue and thus lowering NOx formation.

[0003] In existing technologies, air needs to be filtered before premixing. As the usage time increases, a large amount of dust and particulate matter accumulates on the filter, causing it to become clogged and affecting the air intake of the burner. Cleaning the filter requires shutting down the equipment for a long time, which affects the production efficiency of the equipment.

[0004] Therefore, it is necessary to improve the existing low-NOx burners. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a low-NOx combustion system for an annealing furnace to improve the cleanliness of the air intake for the low-NOx burner.

[0006] To achieve the above objectives, the specific technical solution of the low-NOx combustion system for the annealing furnace of this utility model is as follows: A low-NOx combustion system for an annealing furnace includes a fan connected to the burner body at the gas outlet, and further includes: A cylindrical cover, the outer periphery of which is provided with an air intake and an air exhaust port, the air intake being connected to the air inlet of the fan; A cylindrical filter screen is coaxially rotatably disposed inside the cover. Both ends of the filter screen are sealed to the cover. At least three sealing strips extending axially are evenly distributed on the outer periphery of the filter screen. The sealing strips are slidably sealed to the cover. Along the circumference of the cover, the distance between two adjacent sealing strips is less than the minimum distance between the air extraction port and the air jet port.

[0007] Preferably, in order to provide power for the rotation of the filter screen and facilitate the disassembly and maintenance of the filter screen, a rotating shaft is coaxially rotatably provided inside the cover. The rotating shaft is driven to rotate by a motor. A fixing sleeve is coaxially fixedly connected inside the filter screen. The fixing sleeve is detachably connected to the rotating shaft.

[0008] Preferably, in order to improve the sealing effect between the filter and the cover and prevent external dust and particles from entering the interlayer between them, a sealing ring is provided circumferentially on both ends of the filter. The sealing ring is slidably sealed to the cover, and both ends of the sealing strip are respectively connected to the two sealing rings.

[0009] Preferably, in order to improve the strength of the filter screen and extend its service life, the filter screen is provided with support strips, the number of support strips being the same as the number of sealing strips and corresponding one-to-one, and the sealing strips being distributed on the support strips.

[0010] Preferably, in order to reduce the production cost of the equipment, the jet nozzle is connected to the air outlet of the fan through a splitter pipe.

[0011] Preferably, in order to limit the position of the filter screen and improve the stability of the filter screen installed inside the housing, a flange ring is provided at the end of the housing, and a limiting ring is detachably connected to the flange ring, the inner diameter of the limiting ring being smaller than the inner diameter of the filter screen.

[0012] Preferably, in order to keep the filter screen clean and improve its filtration effect, a dust collection component is also provided on the rotating shaft, which is used to collect dust particles that fall onto the filter screen.

[0013] Preferably, in order to collect dust and particulate matter generated inside the filter screen, the dust collection component includes a mounting sleeve, and the outer peripheral surface of the mounting sleeve is provided with bristles.

[0014] The low-NOx combustion system of the annealing furnace of this utility model has the following advantages: When the filter screen rotates, the airflow ejected from the jet nozzle washes the filter screen in the reverse direction, causing the dust and particulate matter accumulated on the filter screen to fall off. By continuously cleaning the filter screen, the filter screen can be kept clean, improving the purification effect of the filter screen on the air intake of the low-NOx burner and improving the working efficiency of the low-NOx burner. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the connection structure between the fan and the mixer of this utility model; Figure 2 This is a schematic diagram of the connection structure between the cover and the filter screen of this utility model; Figure 3 This is a schematic diagram of the structure of the cover of this utility model; Figure 4 This is a schematic diagram of the structure of the filter screen of this utility model; Figure 5 This is a schematic diagram of the installation structure of the sealing strip and sealing ring of this utility model; Figure 6 This is a schematic diagram of the dust collection component of this utility model; The markings in the diagram are as follows: 1. Fan; 2. Burner body; 3. Cover; 5. Dust collection component; 6. Limiting ring; 101. Air inlet; 102. Diverter pipe; 301. Motor; 302. Air extraction port; 303. Air jet port; 304. Shaft; 401. Filter screen; 402. Support bar; 403. Fixing sleeve; 404. Sealing strip; 405. Sealing ring; 501. Mounting sleeve; 502. Brush bristles. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0017] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of the low-NOx combustion system and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] like Figure 1-3 As shown, a low-NOx combustion system for an annealing furnace includes a blower 1 connected to a burner body 2 at the outlet, and a cylindrical casing 3. The outer periphery of the casing 3 is provided with an exhaust port 302 and an exhaust port 303. The exhaust port 302 is connected to the air inlet 101 of the blower 1. A cylindrical filter screen 401 is coaxially rotatably disposed inside the casing 3. Both ends of the filter screen 401 are sealed to the casing 3. At least three sealing strips 404 extending axially are evenly distributed on the outer periphery of the filter screen 401. The sealing strips 404 are slidably sealed to the casing 3. Along the circumference of the casing 3, the distance between two adjacent sealing strips 404 is less than the minimum distance between the exhaust port 302 and the exhaust port 303.

[0019] The aforementioned low-NOx burner is applicable, but not limited to, providing a stable annealing temperature for an annealing furnace. During operation, a blower 1 draws external air into the burner body 1, simultaneously introducing fuel into the burner body 1 for pre-mixing with the air before combustion to release heat. External air enters the casing 3 and then passes through the exhaust port 302 into the blower 1. Simultaneously, the air entering the casing 3 is filtered by a filter screen 401 to reduce dust and particulate impurities, thereby lowering the likelihood of blockage inside the burner body 2. The filter screen 401 can rotate inside the casing 3. When a large amount of dust accumulates on the filter screen 401 near the exhaust port 302, reducing airflow, the filter screen 401 at this position is rotated to face the jet nozzle 303. The airflow from the jet nozzle 303 then reverses its impact on the filter screen 401, causing the accumulated dust to dissipate. The dust falling off the filter 401 cleans the filter screen 401. The continuous rotation of the filter screen 401 ensures continuous cleaning, maintaining its airflow and guaranteeing the burner's combustion efficiency. The sealing strip 404 divides the interlayer space between the filter screen 401 and the housing 3 into multiple independent sections, severing the connection between the suction port 302 and the jet port 303 within the interlayer space. This allows sufficient suction in the interlayer space connected to the suction port 302 and sufficient positive pressure in the interlayer space connected to the jet port 303, ensuring effective cleaning of the filter screen 401. The cylindrical structure of the filter screen 401 and the housing 3 provides a sufficiently large opening for air to enter and allows dust falling off the filter screen 401 to be discharged to the outside, reducing dust accumulation inside the filter screen 401.

[0020] Further improvements include, for example Figure 3 and 4 As shown, a rotating shaft 304 is coaxially rotatable inside the housing 3. The rotating shaft 304 is driven to rotate by a motor 301. A fixing sleeve 403 is coaxially fixedly connected inside the filter screen 401. The fixing sleeve 403 is detachably connected to the rotating shaft 304. The rotating shaft 304 is fixedly connected to the housing 3 via bearings. The motor 301 is also fixedly connected to the housing, providing power to the rotating shaft 304 to drive its rotation. The fixing sleeve 403 is fitted onto the rotating shaft 304, and a screw is threaded onto the fixing sleeve 403. The screw enables locking and disengagement between the fixing sleeve 403 and the rotating shaft 304, thereby facilitating the installation and removal of the filter screen 401 on the rotating shaft 304 and making it convenient to disassemble and replace the filter screen 401.

[0021] Further improvements include, for example Figure 4 and 5 As shown, both ends of the filter screen 401 are circumferentially provided with sealing rings 405, which are slidably sealed to the cover 3. The two ends of the sealing strip 404 are respectively connected to the two sealing rings 405.

[0022] Specifically, the sealing ring 405, the filter screen 401, and the inner wall of the casing 3 form a sandwich space. The sealing strip 404 divides the sandwich space into multiple small chambers of equal size. When a small chamber is connected to the air extraction port 302, the filter screen 401 within that small chamber acts as an air intake filter. When a small chamber is connected to the air jet port 303, a positive pressure is formed inside the small chamber, which can backwash the filter screen 401 within that small chamber, thus cleaning the filter screen 401. Furthermore, the same small chamber can only be connected to one of the air extraction port 302 or the air jet port 303 at the same time to prevent the air extraction port 302 and the air jet port 303 from connecting to each other, affecting the formation of positive or negative pressure inside the small chamber, thus ensuring the cleaning effect or air intake effect of the filter screen 401.

[0023] Further improvements include, for example Figure 4 and 5 As shown, the filter screen 401 is provided with support strips 402. The number of support strips 402 is the same as the number of sealing strips 404 and they correspond one-to-one. The sealing strips 404 are distributed on the support strips 402. The support strips 404 provide support for the filter screen 401, thereby improving the firmness of the filter screen 401 and extending its service life.

[0024] Further improvements include, for example Figure 1 As shown, the jet nozzle 303 is connected to the air outlet of the fan 1 through the splitter pipe 102.

[0025] Specifically, the air outlet of the fan 1 has a large air pressure, and the airflow entering the fan 1 has a good cleanliness after being filtered by the filter screen 401. The airflow at the air outlet of the fan 1 is guided to the jet nozzle 303 through the diversion pipe 102, so that the jet nozzle 303 can spray out an airflow with strong air pressure and cleanliness, thereby improving the cleaning effect on the filter screen 401 and reducing the chance of the filter screen 401 being contaminated. In addition, setting up the diversion pipe 102 can save costs compared to setting up an additional air pump.

[0026] Further improvements include, for example Figure 2 and 3 As shown, a flange ring is provided at the end of the housing 3, and a limit ring 6 is detachably connected to the flange ring. The inner diameter of the limit ring 6 is smaller than the inner diameter of the filter screen 401. The limit ring 6 can restrict the displacement of the filter screen 401 axially, thereby improving the firmness of the filter screen 401 installation.

[0027] Further improvements include, for example Figure 1 , 2As shown in Figure 6, a dust collection component 5 is also provided on the rotating shaft 304. The dust collection component 5 is used to collect dust particles that fall off the filter screen 401. The dust collection component 5 includes a mounting sleeve 501, and brush bristles 502 are provided on the outer peripheral surface of the mounting sleeve 501.

[0028] The airflow at the jet nozzle 303 blows away the dust on the filter screen 401. The dust falls onto the inner side of the filter screen 401 and is easily adsorbed onto the side of the filter screen 401 closest to the exhaust port 302, leading to an accumulation of dust inside the filter screen 401. This ultimately affects the air intake of the filter screen 401. To address this issue, a dust collection component 5 is installed. The densely distributed bristles 502 on the component 5 create gaps that can adsorb dust, allowing the blown-off dust to accumulate between the bristles 502, reducing the amount of dust that accumulates again on the filter screen 401. This ensures the cleanliness of the filter screen 401 and provides good airflow, guaranteeing normal combustion of the burner. The dust collection component 5 also allows for the control of external airflow. The air inside the filter screen 401 is initially filtered, and it also acts as a buffer against particulate matter and dust in the airflow, reducing the impact force of particulate matter on the filter screen 401, thereby reducing wear and extending its service life. At the same time, it reduces the filtration pressure of the filter screen 401 and ensures its filtration effect. The mounting sleeve 51 is inserted and connected to the rotating shaft 304 to form an interference fit, which facilitates the connection and separation between the two, thereby facilitating the disassembly of the dust collection component 5. The dust collection component 5 can be disassembled and washed regularly to improve its cleanliness. During the disassembly of the dust collection component 5, the filter screen 401 can maintain its filtration effect, so that the burner does not need to be stopped, thus maintaining the production efficiency of the annealing furnace.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A low-NOx combustion system for an annealing furnace, comprising a fan connected to a burner body at the gas outlet, characterized in that, Also includes: A cylindrical cover, the outer periphery of which is provided with an air intake and an air exhaust port, the air intake being connected to the air inlet of the fan; A cylindrical filter screen is coaxially rotatably disposed inside the cover. Both ends of the filter screen are sealed to the cover. At least three sealing strips extending axially are evenly distributed on the outer periphery of the filter screen. The sealing strips are slidably sealed to the cover. Along the circumference of the cover, the distance between two adjacent sealing strips is less than the minimum distance between the air extraction port and the air jet port.

2. The low-NOx combustion system for the annealing furnace according to claim 1, characterized in that, The housing has a rotating shaft that is coaxially rotatable inside. The rotating shaft is driven by a motor. The filter screen has a fixed sleeve that is coaxially fixed inside. The fixed sleeve is detachably connected to the rotating shaft.

3. The low-NOx combustion system for the annealing furnace according to claim 1, characterized in that, Both ends of the filter screen are provided with sealing rings circumferentially, and the sealing rings are slidably and sealingly connected to the cover. The two ends of the sealing strip are respectively connected to the two sealing rings.

4. The low-NOx combustion system for the annealing furnace according to claim 1, characterized in that, The filter screen is provided with support strips, the number of which is the same as the number of sealing strips and corresponds one-to-one, and the sealing strips are distributed on the support strips.

5. The low-NOx combustion system for the annealing furnace according to claim 1, characterized in that, The jet nozzle is connected to the air outlet of the fan via a splitter pipe.

6. The low-NOx combustion system for the annealing furnace according to claim 1, characterized in that, A flange ring is provided at the end of the cover, and a limit ring is detachably connected to the flange ring. The inner diameter of the limit ring is smaller than the inner diameter of the filter screen.

7. The low-NOx combustion system for the annealing furnace according to claim 2, characterized in that, The rotating shaft is also equipped with a dust collection component, which is used to collect dust particles that fall off the filter screen.

8. The low-NOx combustion system for the annealing furnace according to claim 7, characterized in that, The dust collection component includes a mounting sleeve, and brush bristles are provided on the outer peripheral surface of the mounting sleeve.

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