High-combustion-efficiency heat accumulating type burner convenient to overhaul

Abstract

The utility model discloses a high combustion efficiency heat accumulating type burner convenient to overhaul, which comprises a burner body and a natural gas pipeline, the burner body comprises a first box body, a second box body and a castable shell, the natural gas pipeline is arranged in the castable shell, the natural gas pipeline comprises a main pipe arranged in the first box body and a branch pipe arranged in the second box body, and the main pipe is connected with the branch pipe. A castable protective layer which is detachably connected with the castable shell is cast outside the branch pipe; the plurality of branch pipes are vertically arranged, the branch pipes at the lower part are horizontally arranged, the branch pipes at the middle upper part are downwards and obliquely arranged, and the branch pipes are of a double-pipe structure and are radially arranged; the two sides of the castable protection layer and the inner wall of the shell are air channels, grate bricks densely provided with vent holes are arranged at the outlet ends of the two air channels, and the vent holes of the two grate bricks are obliquely distributed towards the branch pipes. Natural gas is ejected from the branch pipe at a specific angle and is fully mixed with air ejected from the vent holes at the end part of the grate brick at the specific angle, so that the combustion efficiency is high, and the natural gas is saved.

Description

Technical Field

[0001] The utility model relates to a burner, in particular to a high-combustion-efficiency regenerative burner which is convenient for maintenance. Background Technique

[0002] At present, the burners used in rolling heating furnaces are special burners for conventional natural gas combustion. In order to save energy and reduce production costs, the regenerative combustion technology has been widely promoted and applied. The working principle of the regenerative combustion technology is that the regenerative burners are arranged in pairs, using the regenerator as a carrier, alternately heated by the waste gas heat, and then the heat stored in the regenerator is used to heat the air. The regenerator is periodically heated and released heat to preheat the air or gas to a high temperature. The combustion effect of the existing burners is poor.

[0003] At present, the natural gas channel of the single-regenerator air burner in use is particularly easy to be damaged after long-term online use. For the damaged part, the internal thermal insulation material of the whole burner needs to be removed, and the formwork needs to be re-built and cast, which is time-consuming and laborious and affects production. Content of the Utility Model

[0004] The utility model aims to solve the above technical problems, thereby providing a high-combustion-efficiency regenerative burner which is convenient for maintenance, improving the combustion effect, and replacing the whole natural gas burner brick, which takes a short time.

[0005] To solve the technical problems thereof, the utility model adopts the following technical solutions:

[0006] A high-combustion-efficiency regenerative burner which is convenient for maintenance, comprising a burner body and a natural gas pipeline,

[0007] The burner body comprises a first box body, a second box body and a castable shell. A natural gas pipeline is arranged in the castable shell. The natural gas pipeline comprises a main pipe placed in the first box body and a branch pipe placed in the second box body. A castable protective layer detachably connected with the castable shell is cast outside the branch pipe;

[0008] A plurality of the branch pipes are arranged vertically, the lower branch pipes are arranged horizontally, and the middle and upper branch pipes are arranged obliquely downward. The branch pipes are of a double-pipe structure and are arranged radially;

[0009] Both sides of the castable protective layer and the inner wall of the shell are air channels. The outlet ends of the two air channels are provided with grate bricks with dense ventilation holes. The ventilation holes of the two grate bricks are arranged obliquely towards the branch pipes.

[0010] Compared with the prior art, the utility model adopting the above technical solutions has the following beneficial effects:

[0011] 1) Natural gas is ejected at a specific angle through the branch pipes, and at the same time, it is fully mixed with the air ejected from the ventilation holes at a specific angle at the end of the grate bricks, with high combustion efficiency and natural gas saving;

[0012] 2) The natural gas burner brick adopts a prefabricated and detachable structure. As it is used for a long time, the damaged natural gas burner brick can be conveniently disassembled, shortening the furnace shutdown time of the heating furnace, improving the maintenance efficiency, and increasing the output.

[0013] Furthermore, the optimized solution of the present utility model is:

[0014] The inclination angle of the branch pipe in the upper middle part is 2 - 5 degrees, and the inclination angle of the ventilation holes of the grate brick is 8 - 10 degrees.

[0015] The castable housing is placed in the second box body and extends out of the second box body, and both ends of the castable housing are of open - mouth structure.

[0016] The branch pipe includes a first sub - pipe and a second sub - pipe. The connection line of the axes of the first sub - pipe and the second sub - pipe of the lower branch pipe is horizontally arranged, and the connection line of the axes of the first sub - pipe and the second sub - pipe of the upper middle part branch pipe is inclined.

[0017] The first box body and the second box body are in a stepped shape. A blind plate is provided at the outer end of the first box body, and a high - alumina fiber blanket is attached to the inner wall of the second box body.

[0018] An annular groove structure with an arc - shaped cross - section is provided on the outer wall of the outlet end of the castable housing.

[0019] The ventilation holes are arranged in multiple rows, and a vertical premixing channel is provided at the inner end of each row of ventilation holes.

[0020] A steel grating is provided at the inlet end of the air channel.

[0021] The first box body is communicated with the air interface pipe. The lower end of the main pipe is communicated with the air inlet of the bottom plate of the first box body. The natural gas interface pipe is communicated with the air inlet of the bottom plate of the first box body. The main pipe and the natural gas interface pipe are connected by flanges.

[0022] The air channel is filled with a heat storage body. Description of the Drawings

[0023] Figure 1 is the front view of the embodiment of the present utility model;

[0024] Figure 2 is Figure 1 the A - A cross - sectional view of

[0025] Figure 3 is Figure 2 the B - B cross - sectional view of

[0026] Figure 4 is the longitudinal cross - sectional view of the heat storage body installation of the embodiment of the present utility model;

[0027] Figure 5 is the transverse cross - sectional view of the heat storage body installation.

[0028] In the figure: burner body 1; first box body 101; second box body 102; castable shell 103; blind plate 104; high-aluminum fiber blanket 105; natural gas pipeline 2; main pipe 201; upper flange 2011; branch pipe 202; first sub-pipe 2021; second sub-pipe 2022; natural gas interface pipe 203; lower flange 2031; castable protective layer 3; air passage 4; grate brick 5; ventilation hole 501; premixing passage 502; steel grating 6; air interface pipe 7; regenerator 8. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] See Figures 1-3 , this embodiment provides a high-efficiency regenerative burner convenient for maintenance. The regenerative burner mainly consists of a burner body 1 and a natural gas pipeline 2. The burner body 1 mainly consists of a first box body 101, a second box body 102, a castable shell 103 and a blind plate 104. The cross-sections of the first box body 101 and the second box body 102 are square or rectangular. The materials of the first box body 101 and the second box body 102 are steel plates with the material of Q235. The cross-sectional dimension of the first box body 101 is smaller than that of the second box body 102, and the first box body 101 and the second box body 102 are in a stepped shape. The inner end of the first box body 101 is open, and a blind plate 104 is detachably installed at its outer end. A U-shaped handle is installed on the outer plate surface of the blind plate 104, which is convenient for removing the blind plate 104 and facilitating the later installation and replacement of the honeycomb body and the grate brick 5. The top plate of the second box body 102 is communicated with the air interface pipe 7. The second box body 102 is welded to the inner end of the first box body 101. Both ends of the second box body 102 are open, and a plurality of anchor claws with different lengths are welded on the inner wall of the second box body 102. The material of the anchor claws is stainless steel.

[0032] The inner wall of the second box body 102 is provided with a castable shell 103. The material of the castable shell 103 is high-strength low-cement castable. Its two ends are open structures. The inner end of the castable shell 103 extends out of the inner end of the second box body 102. The castable shell 103 has good heat preservation effect and long service life. A high-aluminum fiber blanket 105 is pasted between the inner wall of the second box body 102 and the outer wall of the castable shell 103. A ring groove structure with a semicircular cross-section is opened on the outer wall of the outlet end of the castable shell 103.

[0033] A natural gas pipeline 2 is arranged in the middle of the castable shell 103. The natural gas pipeline 2 is composed of a main pipe 201, branch pipes 202 and a natural gas interface pipe 203. The main pipe 201 is placed in the first box body 101 and arranged vertically. The material of the main pipe 201 is 20# ordinary seamless pipe, and the material of the branch pipes 202 is 310S stainless steel seamless pipe. The four branch pipes 202 are all communicated with the main pipe 201. The four branch pipes 202 are arranged vertically from bottom to top. One of the lower branch pipes 202 is arranged horizontally, and the remaining three branch pipes 202 are all arranged obliquely downward, and the inclination angle is 2-5 degrees. In order to increase the combustion effect, each branch pipe 202 is a double-pipe structure. Each branch pipe 202 is composed of a first branch pipe 2021 and a second branch pipe 2022. The first branch pipe 2021 and the second branch pipe 2022 are arranged radially. The first branch pipe 2021 and the second branch pipe 2022 are connected by a plurality of U-shaped connecting sleeves. The connection line of the axes of the first branch pipe 2021 and the second branch pipe 2022 of the lower branch pipe 202 is arranged horizontally, and the connection lines of the axes of the first branch pipe 2021 and the second branch pipe 2022 of the remaining three branch pipes 202 are arranged obliquely and staggered.

[0034] The upper end of the main pipe 201 is blocked. The lower end of the main pipe 201 is communicated with the air inlet of the bottom plate of the first box body 101. The inner end of the natural gas interface pipe 203 is communicated with the air inlet of the bottom plate of the first box body 101. Upper flanges 2011 and lower flanges 2031 are respectively installed on the main pipe 201 and the natural gas interface pipe 203. The upper flanges 2011 and the lower flanges 2031 are connected by bolts.

[0035] A castable protective layer 3 is arranged outside the natural gas pipeline 2. The castable protective layer 3 is low-cement castable. Its cross-section is rectangular. Its top surface and bottom surface are respectively in close contact with the inner wall of the castable shell 103 and are detachably connected. The natural gas pipeline 2 and the castable protective layer 3 form a natural gas burner brick. The castable protective layer 3 is cast in layers. On the premise of ensuring strength, the natural gas burner brick can be smoothly removed when switching to blast furnace gas. The castable protective layer 3 improves the service life of the natural gas pipeline 2.

[0036] On both sides of the castable protective layer 3 and the inner wall of the castable housing 103 form an air passage 4. The outlet end of the air passage 4 is equipped with a grid brick 5. The grid brick 5 is detachably connected to the castable housing 103. The grid brick 5 is made of fused corundum, with better heat resistance. The grid brick 5 is densely distributed with ventilation holes 501. The grid brick 5 is provided with multiple columns of ventilation holes 501. Each column of ventilation holes 501 has multiple holes. Each column of ventilation holes 501 is inclined towards the branch pipe 202, with an inclination angle of 8 - 10 degrees. The ventilation holes 501 make the air and natural gas mix evenly and burn fully. The inner end of each column of ventilation holes 501 is provided with a vertical premixing channel 502. The cross-section of the premixing channel 502 is semi-circular. The air inside the ventilation holes 501 is premixed by itself and then sprayed out through the nozzles of the ventilation holes 501, and all is fully mixed with the natural gas in the middle, improving the combustion efficiency.

[0037] The air passage 4 inside the grid brick 5 is filled with a heat storage body 8. The heat storage body 8 has a honeycomb structure. The heat storage body 8 is in the shape of a brick and is detachably connected to the air passage 4. The inlet end of the air passage 4 is provided with a steel grating 6. The steel grating 6 is located at the inner end face of the heat storage body 8. The steel grating 6 prevents the heat storage body 8 from tipping over during commutation. The steel grating 6 is made of 304 material and has a longer service life.

[0038] When this embodiment is in use, the preheating temperature of the hot air can reach 1000°C. Natural gas is ejected from the port of the branch pipe 202. Air enters the ventilation holes 501 of the grid brick 5 from the air passage 4. The air will obtain a higher nozzle flow rate. The air ejected from the air passages 4 on both sides converges with the natural gas ejected from the middle branch pipe 202, burns fully, and the combustion efficiency of natural gas is high. At the same time, by adjusting the angle between the nozzle of the grid brick 5 and the branch pipe 202, a longer or shorter flame length can be obtained.

[0039] The overhaul and replacement process of this embodiment is as follows:

[0040] (1) Close the cut-off ball valve on the main pipe of the natural gas pipeline of the heating furnace;

[0041] (2) Close all the ball valves on the natural gas interface pipe 203 in front of the burner and the butterfly valves on the air interface pipe 7;

[0042] (3) Open the nitrogen purge valve on the main pipe and purge the inside of the natural gas pipeline;

[0043] (4) Open the blind plate 104 at the tail of the regenerative burner, remove all the steel grating 6, heat storage body 8, and grid brick 5 inside the burner, and finally unscrew the upper flange 2011 of the main pipe 201 to remove all the natural gas burner bricks;

[0044] (5) Reinstall the prefabricated natural gas burner bricks and connect the upper flange 2011 of the main pipe 201;

[0045] (6) Then, use high-temperature refractory mortar to smear the contact position between the natural gas burner brick and the castable shell 103 tightly.

[0046] (7) Then, reinstall the grate brick 5, the regenerator 8, and the steel grating 6, and install the tail blind plate 104. The replacement of the new natural gas burner brick is completed.

[0047] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A high-efficiency regenerative burner that is easy to maintain, comprising a burner body and a natural gas pipeline, characterized in that: The burner body comprises a first box body, a second box body and a castable shell, a natural gas pipeline is arranged in the castable shell, the natural gas pipeline comprises a main pipe arranged in the first box body and a branch pipe arranged in the second box body, and a castable protective layer detachably connected to the castable shell is cast outside the branch pipe; The plurality of branch pipes are arranged vertically, the lower branch pipes are arranged horizontally, the middle and upper branch pipes are arranged obliquely downward, and the branch pipes are double-pipe structures and are arranged radially; Both sides of the castable protective layer and the inner wall of the shell are air channels. The outlet ends of the two air channels are provided with grate bricks densely covered with ventilation holes. The ventilation holes of the two grate bricks are arranged obliquely toward the branch pipe.

2. The high-efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The inclination angle of the branch pipe in the middle and upper part is 2-5 degrees, and the inclination angle of the vent hole of the grate brick is 8-10 degrees.

3. The high fuel efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The casting material shell is placed in the second box body and extends out of the second box body, and both ends of the casting material shell are open structures.

4. The high fuel efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The branch pipe comprises a first branch pipe and a second branch pipe, the connecting line of the axes of the first branch pipe and the second branch pipe of the lower branch pipe is horizontally arranged, and the connecting line of the axes of the first branch pipe and the second branch pipe of the middle and upper branch pipe is inclinedly arranged.

5. The high fuel efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The first box body and the second box body are in a step shape, a blind plate is arranged at the outer end of the first box body, and a high-aluminum fiber blanket is attached to the inner wall of the second box body.

6. The high-efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The outer wall of the outlet end of the casting material shell is provided with an annular groove structure with an arc-shaped cross section.

7. The high fuel efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The vent holes are arranged in multiple rows, and a vertical premixing channel is arranged at the inner end of each row of vent holes.

8. The high-efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: A steel grating is provided at the inlet end of the air passage.

9. The high fuel efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The first box is connected to the air interface pipe, the lower end of the main pipe is connected to the air inlet of the first box bottom plate, the natural gas interface pipe is connected to the air inlet of the first box bottom plate, and the main pipe and the natural gas interface pipe are connected by a flange.

10. The high fuel efficiency regenerative burner that is easy to maintain according to claim 1 is characterized in that: The air channel is filled with a heat storage body.

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