Refractory brick for connecting bridge pipe of gas collecting pipe of clean type heat recovery coke oven
By using refractory bricks and thermal telescopic compensation brick components in a clean heat recovery coke oven, the thermal stress and mechanical stress problems caused by the relative displacement between the bridge pipe and the gas collector pipe are solved, extending the service life and improving the safety and thermal energy utilization efficiency of the coke oven.
Patent Information
- Application Number
- CN202421253636.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-03
AI Technical Summary
In a clean heat recovery coke oven, the relative displacement between the bridge pipe and the gas collecting pipe leads to thermal and mechanical stress, causing the pipe wall to crack and collapse, shortening the service life and affecting the safe and stable operation of the coke oven.
Refractory bricks are used as the connecting structure between the bridge pipe and the gas collecting pipe, and the brick assembly and multi-layer insulation structure are compensated by thermal expansion and contraction to eliminate thermal and mechanical stresses and block high-temperature airflow leakage.
It effectively extends the service life of the bridge pipe and gas collector pipe, ensures the safe and reliable operation of the coke oven, and improves the utilization efficiency of high-temperature airflow thermal energy.
Smart Images
Figure CN222834248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a clean heat recovery coking oven, in particular to a connection structure of a furnace bridge pipe of the clean heat recovery coking oven and a gas collecting pipe for conveying raw coal gas of the coking oven. Background Art
[0002] Clean heat recovery coke ovens are gaining more and more attention and application because they do not emit smoke and dust during the coking process, do not pollute the atmosphere and water environment, and can achieve comprehensive utilization of thermal energy.
[0003] The clean heat recovery coke oven mainly includes the key parts such as the carbonization chamber, the combustion chamber and the gas collecting pipe. The combustion chamber is located at the bottom of the carbonization chamber. The high-temperature exhaust gas in the carbonization chamber and the combustion chamber is sent to the gas collecting pipe through the rising fire channel and the bridge pipe on the coke oven body, and finally the high-temperature exhaust gas is sent to the waste heat boiler to generate steam for power generation.
[0004] The heat recovery coke oven bridge pipe is a key component connecting the carbonization chamber and the gas collecting pipe. The high-temperature waste heat directly enters the gas collecting pipe through the bridge pipe, and its temperature can reach 1300℃-1350℃, which is the highest temperature part of the entire heat recovery coke oven. Each parallel carbonization chamber and combustion chamber transports high-temperature waste gas and raw coal gas to the coke oven gas collecting pipe through the corresponding coke oven bridge pipe. The waste gas temperature transported by the coke oven gas collecting pipe is above 1000℃.
[0005] Since the gas collecting pipe is supported on the ground by the corresponding steel frame, and the bridge pipe is set on the top of the furnace body. Although the gas collecting pipe and the bridge pipe are interconnected, they are not supported on the same base at the same time. Due to factors such as the temperature difference of the conveyed gas and the different temperature fluctuation amplitudes, relative displacement between the two is inevitable. The relative displacement of the gas collecting pipe and the bridge pipe can reach 80mm. Such displacement will generate displacement stress on the bridge pipe and the gas collecting pipe wall. Whether it is the mechanical stress caused by displacement or the thermal stress caused by temperature fluctuation, they are all very harmful factors that cause the cracking and collapse of the bridge pipe and the gas collecting pipe wall, which not only shortens the service life of the bridge pipe and the gas collecting pipe, but also directly affects the safe and stable operation of the coke oven. Utility Model Content
[0006] In view of the above problems existing in the prior art, the technical problem to be solved by the utility model is to provide a clean refractory brick for connecting the heat recovery coke oven gas collecting pipe bridge pipe, which can effectively eliminate thermal stress and thermal displacement.
[0007] In order to solve the above technical problems, the utility model provides refractory bricks for connecting clean heat recovery coke oven gas collecting pipe bridge pipes, including a gas collecting pipe and a bridge pipe that are interconnected, the gas collecting pipe including a gas collecting pipe shell, and the gas collecting pipe shell is composed of a gas collecting pipe insulation layer, a gas collecting pipe heat insulation layer and a gas collecting pipe surface heat layer from the outside to the inside, and the gas collecting pipe surface heat layer forms a gas collecting pipe cavity; the bridge pipe includes a bridge pipe channel surrounded by a bridge pipe brick wall and a bridge pipe top brick, and the bridge pipe heat insulation layer, a bridge pipe thermal insulation layer and a bridge pipe shell are composed of the bridge pipe brick wall and the bridge pipe top brick from the inside to the outside; the interface pipe wall of the bridge pipe is connected to the interface pipe wall of the gas collecting pipe through a thermal expansion compensation brick assembly, and the thermal expansion compensation brick assembly includes two oppositely arranged inclined groove refractory bricks, and a sealing movable column is movably arranged in the sealing inclined groove of the two oppositely arranged inclined groove refractory bricks.
[0008] Preferably, the chute cavity formed by the two oppositely arranged sealing chute grooves is filled with a chute filler, and the sealing movable column is buried in the chute filler.
[0009] Preferably, the bottom inclination angle of the sealing inclined groove is α=25°-45°.
[0010] Preferably, the diameter of the sealing movable column is D, and the bottom width d of the inclined groove cavity formed by the two oppositely arranged sealing inclined grooves is D=(1.25-1.5)d.
[0011] Preferably, one inclined groove refractory brick of the thermal expansion compensation brick assembly is fixedly built on the interface pipe wall of the bridge pipe, and another inclined groove refractory brick of the thermal expansion compensation brick assembly is fixedly built on the interface pipe wall of the gas collecting pipe.
[0012] Preferably, the bridge pipe brick walls and bridge pipe top bricks form a strip-shaped bridge pipe channel; the gas collecting pipe surface thermal layer forms a gas collecting pipe cavity with a circular tube cross-section; and a plurality of bridge pipe channels are connected to the gas collecting pipe cavity toward the ground.
[0013] Preferably, the chute refractory bricks are corrosion-resistant mullite refractory bricks, the chute filler is ceramic fiber, and the sealing movable column is heavy refractory bricks.
[0014] Preferably, the gas collecting pipe shell is rolled from carbon steel plate, the gas collecting pipe insulation layer is laid with ceramic fiber felt, the gas collecting pipe heat insulation layer is built with mullite insulation bricks, and the gas collecting pipe surface heat layer is built with corrosion-resistant mullite refractory bricks.
[0015] Preferably, the bridge pipe is made of carbon steel plate, the bridge pipe insulation layer is laid with ceramic fiber, the bridge pipe heat insulation layer is built with mullite insulation bricks, the bridge pipe top bricks are corrosion-resistant mullite refractory bricks, and the bridge pipe brick walls are built with corrosion-resistant mullite refractory bricks.
[0016] In the above structure, since the pipe wall of the bridge pipe is connected to the pipe wall of the gas collecting pipe through the thermal expansion and contraction compensation brick assembly, the bridge pipe and the gas collecting pipe form a flexible connection. The inclined groove cavity formed by the two oppositely arranged inclined groove refractory bricks is movably provided with a sealing movable column. This structure can not only ensure that the two oppositely arranged inclined groove refractory bricks can move relatively to eliminate the thermal stress caused by expansion and contraction due to temperature changes, and the mechanical stress caused by position changes; but also the sealing movable column movably provided in the inclined groove cavity formed by the inclined groove refractory bricks can block the leakage of high-temperature airflow along the brick seams. In addition, since the outer shell of the gas collecting pipe is sequentially provided with the gas collecting pipe insulation layer, the gas collecting pipe heat insulation layer and the gas collecting pipe surface heat layer from the outside to the inside; the outer side of the bridge pipe is sequentially provided with the bridge pipe insulation layer and the bridge pipe heat insulation layer from the inside to the outside. The multi-layer heat insulation structure effectively reduces the dissipation loss of the heat energy of the high-temperature airflow of the gas collecting pipe, greatly reduces the surface temperature of the gas collecting pipe, not only ensures the full utilization of the heat energy of the high-temperature airflow, but also prolongs the service life of the gas collecting pipe and the bridge pipe, and ensures the safe and reliable operation of the coke oven. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The following is a further description of the refractory bricks for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe of the utility model in conjunction with the accompanying drawings and specific implementation methods.
[0018] Figure 1 It is a schematic cross-sectional structure diagram of a specific implementation mode of the utility model of refractory bricks for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe;
[0019] Figure 2 yes Figure 1 A-A section structural diagram;
[0020] Figure 3 yes Figure 1 Middle B-B section structure schematic diagram;
[0021] Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure of the medium thermal expansion compensation brick assembly;
[0022] Figure 5 yes Figure 4 Schematic diagram of the front structure of the middle chute refractory brick;
[0023] Figure 6 yes Figure 5 Left view of .
[0024] In the figure, 1 is the gas collecting pipe support; 2 is the gas collecting pipe shell; 3 is the gas collecting pipe insulation layer; 4 is the gas collecting pipe heat insulation layer; 5 is the gas collecting pipe surface heat layer; 6 is the chute refractory brick; 7 is the chute filler; 8 is the sealing movable column; 9 is the bridge pipe shell; 10 is the bridge pipe insulation layer; 11 is the bridge pipe heat insulation layer; 12 is the bridge pipe top brick; 13 is the bridge pipe brick wall; 14 is the bridge pipe channel; 15 is the sealed chute. DETAILED DESCRIPTION
[0025] like Figure 1 , Figure 2 and Figure 3 The refractory bricks for connecting the gas collecting pipe bridge pipe of the clean heat recovery coke oven shown in the figure include a gas collecting pipe and a bridge pipe. The gas collecting pipe is supported on a gas collecting pipe support 1, and the gas collecting pipe support 1 is deeply rooted in the ground; the bridge pipe is arranged on the top of the coke oven body. Since a number of carbonization chambers and combustion chambers are arranged in parallel on the coke oven body, each carbonization chamber and combustion chamber corresponds to a bridge pipe on the top thereof. Therefore, the gas collecting pipe is connected to a number of bridge pipes in parallel.
[0026] The gas collecting pipe includes a cylindrical gas collecting pipe shell 2 rolled from a carbon steel plate, and a gas collecting pipe insulation layer 3, a gas collecting pipe heat insulation layer 4 and a gas collecting pipe surface heat layer 5 are laid on the inner wall of the gas collecting pipe shell 2 from the outside to the inside in sequence; the gas collecting pipe insulation layer 3 is made of ceramic fiber felt laid along the inner wall of the gas collecting pipe shell 2, and the gas collecting pipe heat insulation layer 4 is built with mullite bricks with plug-in convex tenons and tenons. The gas collecting pipe surface heat layer 5 is built on the inner side of the gas collecting pipe heat insulation layer 4, and the gas collecting pipe surface heat layer 5 is built with anti-corrosion mullite refractory bricks with plug-in convex tenons and tenons; the gas collecting pipe surface heat layer 5 surrounds the gas collecting pipe cavity for conveying high-temperature airflow. Pipe interfaces are provided at the positions corresponding to the gas collecting pipes and the bridge pipes, so that each bridge pipe is connected to the gas collecting pipe.
[0027] The bridge pipe includes a bridge pipe channel 14 surrounded by a bridge pipe brick wall 13 and a bridge pipe top brick 12. The bridge pipe channel 14 is a strip channel. The lower end of the bridge pipe channel 14 leads to the carbonization chamber and the combustion chamber of the coke oven body, and the front end of the bridge pipe 14 leads to the tube cavity of the gas collecting pipe. The bridge pipe shell 9 is made of carbon steel plate bent and welded, the bridge pipe insulation layer 10 is paved with ceramic fiber felt, the bridge pipe top block 12 is erosion-resistant mullite brick, and the bridge pipe brick wall 13 is built of erosion-resistant mullite brick.
[0028] A plurality of closely attached thermal expansion compensation brick assemblies are arranged between the pipe wall at the bridge pipe interface and the pipe wall at the gas collecting pipe interface, that is, the pipe wall at the bridge pipe interface and the pipe wall at the gas collecting pipe interface are connected to each other through the thermal expansion compensation brick assemblies.
[0029] like Figure 4 , Figure 5 and Figure 6 The thermal expansion and contraction compensation brick assembly shown in the figure comprises two oppositely arranged skew groove refractory bricks 6, the skew groove refractory bricks 6 are generally in a hexahedral structure, a through sealing skew groove 15 is arranged on one side of the skew groove refractory brick 6, the sealing skew grooves 15 opposite to each other of the two skew groove refractory bricks 6 form a skew groove cavity, the skew groove cavity is filled with a skew groove filler 7, and a sealing movable column 8 is buried in the skew groove filler 7.
[0030] The bottom inclination angle of the sealing chute 15 on the chute refractory brick 6 is α=35°, preferably α=25°-45°. The bottom width of the chute cavity formed by the sealing chute 15 of the two chute refractory bricks is d, and the sealing movable column 8 adopts a short cylindrical structure, and the sealing movable column 8 has a diameter of D=68mm, d=50mm, preferably D=(1.25-1.5)d.
[0031] The chute refractory bricks 6 are corrosion-resistant mullite refractory bricks, the chute fillers 7 are ceramic fibers, and the sealing movable column 8 is made of heavy refractory brick material.
[0032] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that technicians in the relevant technical field can understand and use the utility model well. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.
Claims
1. A refractory brick for connecting a clean heat recovery coke oven gas collecting pipe bridge pipe, comprising a gas collecting pipe and a bridge pipe interconnected with each other, characterized in that: The gas collecting pipe comprises a gas collecting pipe shell (2), and the gas collecting pipe shell (2) is provided with a gas collecting pipe insulation layer (3), a gas collecting pipe heat insulating layer (4) and a gas collecting pipe surface heat layer (5) from the outside to the inside, and the gas collecting pipe surface heat layer (5) surrounds the gas collecting pipe cavity; the bridge pipe comprises a bridge pipe channel (14) surrounded by a bridge pipe brick wall (13) and a bridge pipe top brick (12), and the bridge pipe heat insulating layer (11), a bridge pipe heat insulating layer (10) and a bridge pipe shell (9) are provided on the outside of the bridge pipe brick wall (13) and the bridge pipe top brick (12) from the inside to the outside; the interface pipe wall of the bridge pipe is connected to the interface pipe wall of the gas collecting pipe through a thermal expansion compensation brick assembly, and the thermal expansion compensation brick assembly comprises two oppositely arranged inclined groove refractory bricks (6), and a sealing movable column (8) is movably provided in the sealing inclined groove (15) of the two oppositely arranged inclined groove refractory bricks (6).
2. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: The chute cavity formed by the two oppositely arranged sealing chute grooves (15) is filled with a chute filler (7), and the sealing movable column (8) is buried in the chute filler (7).
3. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: The bottom inclination angle of the sealing inclined groove (15) is α=25°-45°.
4. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: The diameter of the sealing movable column (8) is D, and the bottom width d of the inclined groove cavity formed by the two oppositely arranged sealing inclined grooves (15) is D=(1.25-1.5)d.
5. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: One inclined groove refractory brick (6) of the thermal expansion compensation brick assembly is fixedly built on the interface pipe wall of the bridge pipe, and another inclined groove refractory brick (6) of the thermal expansion compensation brick assembly is fixedly built on the interface pipe wall of the gas collecting pipe.
6. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: The bridge pipe brick wall (13) and the bridge pipe top brick (12) enclose a strip-shaped bridge pipe channel (14); the gas collecting pipe surface heat layer (5) encloses a gas collecting pipe cavity with a circular pipe cross section; and a plurality of bridge pipe channels (14) are connected to the gas collecting pipe cavity in the ground.
7. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 2, characterized in that: The chute refractory bricks (6) are corrosion-resistant mullite refractory bricks, the chute fillers (7) are ceramic fibers, and the sealing movable columns (8) are heavy refractory bricks.
8. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: The gas collecting pipe shell (2) is formed by rolling carbon steel plates, the gas collecting pipe insulation layer (3) is formed by laying ceramic fiber felt, the gas collecting pipe heat insulation layer (4) is formed by laying mullite heat insulation bricks, and the gas collecting pipe surface heat layer (5) is formed by laying erosion-resistant mullite refractory bricks.
9. The refractory brick for connecting the clean heat recovery coke oven gas collecting pipe bridge pipe according to claim 1, characterized in that: The bridge pipe shell (9) is made of carbon steel plate, the bridge pipe insulation layer (10) is made of ceramic fiber, the bridge pipe heat insulation layer (11) is made of mullite insulation bricks, the bridge pipe top brick (12) is corrosion-resistant mullite refractory brick, and the bridge pipe brick wall (13) is made of corrosion-resistant mullite refractory bricks.