Blast furnace gas and natural gas dual-purpose heat accumulating type burner device

Abstract

The utility model relates to a burner, in particular to a dual-purpose heat accumulating type burner device for blast furnace gas and natural gas. Comprising a first dual-purpose heat accumulating type combustor and a second dual-purpose heat accumulating type combustor, and the two dual-purpose heat accumulating type combustors are arranged side by side and closely arranged; the first dual-purpose heat accumulating type combustor comprises a shell with the inner end open and a natural gas channel brick, the natural gas channel brick is arranged in the middle in the shell and detachably connected with the shell, and the two sides of the natural gas channel brick and the inner wall of the shell form an air channel. When the fuel gas is natural gas, the air channels of the two dual-purpose heat accumulating type combustors are respectively communicated with air, and the natural gas pipeline of the natural gas channel brick is communicated with the natural gas; and when the gas is blast furnace gas, the natural gas channel brick is detached, the first dual-purpose heat accumulating type combustor is communicated with air, and the second dual-purpose heat accumulating type combustor is communicated with the blast furnace gas. The utility model solves the problem that the heating furnace of the rolling mill cannot be put into production due to no blast furnace gas at the earlier stage, reduces the production cost, and can better meet the heating quality.

Description

Technical Field

[0001] The utility model relates to a burner, in particular to a regenerative burner device for dual use of blast furnace gas and natural gas. Background Technique

[0002] Blast furnace gas is a by-product obtained during the process of blast furnace ironmaking. Its main combustible component is CO, and its calorific value is 750 - 850 Kcal, belonging to low calorific value fuel. The theoretical combustion temperature of blast furnace gas is 1400 - 1500 °C. In many cases, it is necessary to preheat air and gas to increase its combustion temperature to meet the requirements of users.

[0003] Natural gas is a high-quality gaseous fuel. It mainly exists in oil-producing areas or pure natural gas fields. Its main component is methane (CH4), and its calorific value is generally 8000 - 8600 Kcal, belonging to high calorific value fuel. It can meet the use requirements only after preheating air. Its transportation methods mainly include long-distance transportation along pipelines, which is called pipeline gas. In places where it is not suitable to lay pipelines, it can also be pressurized to become liquid at normal temperature and stored in high-pressure tanks, which is called liquefied natural gas. Long-distance transportation or transportation by storing liquid in high-pressure tanks has a short construction period and transportation time.

[0004] Generally, a blast furnace gas regenerative burner or a natural gas special burner is installed on a heating furnace. Due to the long construction period of blast furnaces and the short construction period of independent rolling mills, during the construction process of many large steel enterprises, the rolling mills are often completed while the blast furnaces are still under construction. Since there is no blast furnace gas in the heating furnace of the rolling mill, the rolling mill cannot be put into production normally. Content of the Utility Model

[0005] The utility model aims to solve the above technical problems, and thus provides a regenerative burner device for dual use of blast furnace gas and natural gas, which solves the problem that the heating furnace of the rolling mill in the long-process rolling mill cannot be put into production normally due to the lack of blast furnace gas in the early stage.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A regenerative burner device for dual use of blast furnace gas and natural gas, characterized in that: it includes a first dual-use regenerative burner and a second dual-use regenerative burner, and the two dual-use regenerative burners are arranged side by side and adjacent to each other;

[0008] The first dual-use regenerative burner includes a housing with an open inner end and a natural gas channel brick. The natural gas channel brick is placed in the middle of the housing and is detachably connected to it. The two sides of the natural gas channel brick and the inner wall of the housing form an air channel;

[0009] When the fuel gas is natural gas, the air channels of the two dual-purpose regenerative burners are respectively connected to air, and the natural gas pipeline of the natural gas channel brick is connected to natural gas;

[0010] When the fuel gas is blast furnace gas, remove the natural gas channel brick. The first dual-purpose regenerative burner is connected to air, and the second dual-purpose regenerative burner is connected to blast furnace gas.

[0011] Compared with the prior art, the beneficial effects of the present utility model adopting the above technical solution are as follows:

[0012] Using natural gas in the early stage and blast furnace gas in the later stage solves the problem that the reheating furnace in the rolling mill cannot be put into production due to the lack of blast furnace gas in the early stage. At the same time, the dual-purpose burner takes into account the power difference between the burners using low calorific value (blast furnace gas) and high calorific value (natural gas), ensuring a good air-fuel ratio for both gases, preventing waste of either gas, reducing production costs, and better meeting the heating quality requirements.

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

[0014] When the fuel gas is natural gas, first grate bricks are respectively installed at the outlet ends of the air channels, and the first grate bricks are densely provided with ventilation holes.

[0015] When the fuel gas is blast furnace gas, a second grate brick is installed on the first dual-purpose regenerative burner, and a third grate brick is installed on the second dual-purpose regenerative burner.

[0016] The axes of the ventilation holes of the second grate brick and the third grate brick are arranged intersectingly.

[0017] The natural gas channel brick includes a natural gas pipeline and a castable protective layer. The natural gas pipeline includes a main pipe, branch pipes, and an inlet pipe. The main pipe is arranged vertically, multiple branch pipes are connected to the main pipe, the main pipe and the branch pipes are provided with a castable protective layer outside, and one end of the inlet pipe is connected to the main pipe, and the other end of the inlet pipe penetrates through the housing. Description of the Drawings

[0018] Figure 1 is the front view of the embodiment of the present utility model;

[0019] Figure 2 is Figure 1 the left view of;

[0020] Figure 3 is Figure 1 the A-A sectional view of;

[0021] Figure 4 is Figure 1 the B-B sectional view of;

[0022] Figure 5 is the state diagram when the fuel gas is natural gas;

[0023] Figure 6 It is a state diagram when the fuel gas is blast furnace gas.

[0024] In the figure: the first dual-purpose regenerative burner 1; the housing 101; the first box body 1011; the second box body 1012; the castable housing 1013; the end cover 1014; the high-aluminum fiber blanket 1015; the natural gas pipeline 102; the main pipe 1021; the branch pipe 1022; the first sub-branch pipe 10221; the second sub-branch pipe 10222; the inlet pipe 1023; the castable protective layer 103; the air passage 104; the first grate brick 105; the ventilation hole 1051; the steel grating 106; the second dual-purpose regenerative burner 2; the heating furnace 3. Specific implementation manners

[0025] 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.

[0026] 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. It 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 to the present invention.

[0027] See Figures 1 - 4 , this embodiment provides a dual-purpose regenerative burner device for blast furnace gas and natural gas, mainly composed of the first dual-purpose regenerative burner 1 and the second dual-purpose regenerative burner 2. The structures of the first dual-purpose regenerative burner 1 and the second dual-purpose regenerative burner 2 are the same, and the first dual-purpose regenerative burner 1 and the second dual-purpose regenerative burner 2 are arranged adjacent to each other on the furnace body of the heating furnace 3.

[0028] The first dual-purpose regenerative burner 1 is mainly composed of a housing 101 and a natural gas channel brick 102. The housing 101 is mainly composed of a first box body 1011, a second box body 1012, a castable housing 1013 and an end cover 1014. The cross-sections of the first box body 1011 and the second box body 1012 are square or rectangular. The materials of the first box body 1011 and the second box body 1012 are steel plates. The cross-sectional size of the first box body 1011 is smaller than that of the second box body 1012, and the first box body 1011 and the second box body 1012 are in a stepped shape. The inner end of the first box body 1011 is open, and an end cover 1014 is detachably installed at its outer end. A U-shaped handle is installed on the outer plate surface of the end cover 1014, which facilitates the removal of the end cover 1014. The second box body 1012 is welded to the inner end of the first box body 1011. The two ends of the second box body 1012 are open, and a high-aluminum fiber blanket 1015 is attached to the inner wall of the second box body 1012.

[0029] A castable housing 1013 is arranged inside the second box body 102. The material of the castable housing 1013 is low-cement castable, and its two ends are of an open structure. The inner end of the castable housing 1013 extends out of the inner end of the second box body 102. A ring groove structure with a semicircular cross-section is opened on the outer wall of the outlet end of the castable housing 1013. A natural gas channel brick is arranged in the middle of the castable housing 1013. The natural gas channel brick is composed of a natural gas pipeline 102 and a castable protective layer 103. The natural gas pipeline is composed of a main pipe 1021, branch pipes 1022 and an inlet pipe 1023. The main pipe 1021 is arranged vertically and is located at the inner end of the castable housing 1013. Four branch pipes 1022 are communicated with the main pipe 1201. The four branch pipes 202 are arranged vertically from bottom to top. The lower branch pipe 202 is arranged horizontally, and the three branch pipes 202 above it are all arranged obliquely downward, and the inclination angle is 2-5 degrees. The inner end of the inlet pipe 1023 is communicated with the main pipe 1021. The inlet pipe 1023 is Z-shaped. The outer end of the inlet pipe 1023 penetrates through the bottom plate of the first box body 1011 and is installed with a flange. The vertical part of the inlet pipe 1023 can adopt a threaded sleeve connection structure.

[0030] In order to enhance the combustion effect, each branch pipe 1022 is of a double-pipe structure. Each branch pipe 1022 is composed of a first branch pipe 10221 and a second branch pipe 10222. The first branch pipe 10221 and the second branch pipe 10222 are arranged radially. The first branch pipe 10221 and the second branch pipe 10222 are connected by a plurality of U-shaped connecting sleeves. The connecting line of the axes of the first branch pipe 10221 and the second branch pipe 10222 of the lower branch pipe 202 is horizontally arranged. The connecting lines of the axes of the first branch pipe 2021 and the second branch pipe 2022 of the remaining three branch pipes 202 are obliquely arranged and staggered.

[0031] There is a castable protective layer 103 outside the main pipe 1021 and the branch pipe 1022. The castable protective layer 103 is a high-strength low-cement castable, and its cross-section is rectangular. Its top surface and bottom surface are respectively in close contact with and detachably connected to the inner wall of the castable housing 1013. The castable protective layer 103 is cast in layers. On the premise of ensuring strength, when switching to blast furnace gas, the castable housing 1013 and the natural gas pipeline therein can be smoothly removed. The castable protective layer 103 improves the service life of the natural gas pipeline 102. Both sides of the castable protective layer 103 and the inner wall of the castable housing 1013 form an air channel 104. The outlet end of the air channel 104 is equipped with a first grate brick 105, and the first grate brick 105 is densely covered with ventilation holes 1051. The first grate brick 105 is provided with multiple columns of ventilation holes 1051, and each column of ventilation holes 1051 is provided with multiple. Each column of ventilation holes 1051 is inclined and arranged towards the branch pipe 1022, so that air and natural gas are evenly mixed and burned fully. The inner end of each column of ventilation holes 1051 is provided with a premixing channel with a vertical groove structure. The first grate brick 105 is detachably connected to the castable housing 1013, and the inlet end of the air channel 104 is provided with a steel grating 106.

[0032] When the fuel gas is natural gas ( Figure 5 as shown), natural gas sprays out from the ports of the branch pipes 1022 of the first dual-purpose regenerative burner 1 and the second dual-purpose regenerative burner 2. A honeycomb-structured regenerator (not shown in the figure) is installed in the air channel 104, and the steel grating 106 limits the regenerator. Air enters the ventilation holes 1051 of the first grate brick 105 from the air channel 104, and the air will obtain a higher jet velocity. The air sprayed out from the air channels 104 on both sides and the natural gas sprayed out from the middle branch pipe 1022 converge together, and the combustion is sufficient, and the combustion efficiency of natural gas is high. At the same time, by adjusting the angle between the jet orifice of the first grate brick 105 and the branch pipe 1022, a longer or shorter flame length can be obtained.

[0033] When the fuel gas is blast furnace gas ( Figure 6 as shown), the natural gas channel bricks, regenerators and the first grate brick 105 of the first dual-purpose regenerative burner 1 and the second dual-purpose regenerative burner 2 are disassembled, and the castable protective layer 103 and the natural gas channel bricks are disassembled as a whole. The outlet end of the castable housing 1013 of the first dual-purpose regenerative burner 1 is installed with a second grate brick 106, and the outlet end of the castable housing 1013 of the second dual-purpose regenerative burner 2 is installed with a third grate brick 107. The axes of the ventilation holes 1051 of the second grate brick 106 and the third grate brick 107 intersect and are arranged. The first dual-purpose regenerative burner 1 is connected to air, and the second dual-purpose regenerative burner 2 is connected to blast furnace gas. The first dual-purpose regenerative burner 1 and the second dual-purpose regenerative burner 2 are combined into a regenerative burner.

[0034] When the utility model uses natural gas, single regenerative technology is adopted for air, which solves the difference in the furnace types of blast furnace gas and natural gas used simultaneously. In the early stage of the heating furnace, natural gas is used as fuel, and in the later stage, blast furnace gas is used as fuel, which solves the losses caused by the inability to put the heating furnace into production due to the lack of blast furnace gas in the early stage of the rolling mill. All burners are regenerative burners, and regenerators are installed in the castable shell, which solves the problem of demolishing the furnace wall and replacing the burners again due to fuel change in the later stage, and reduces the cost of the rolling mill. The gas and air channels of the burner are designed in detail through combustion theory, the gas and air are evenly mixed, the flame length is adjustable, and the difference in burner power is solved at the same time.

[0035] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A heat storage burner device for blast furnace gas and natural gas, characterized in that: It comprises a first dual-purpose regenerative burner and a second dual-purpose regenerative burner, wherein the two dual-purpose regenerative burners are arranged in parallel and adjacent to each other; The first dual-purpose regenerative burner comprises a shell with an open inner end and a natural gas channel brick, wherein the natural gas channel brick is placed in the middle of the shell and is detachably connected thereto, and both sides of the natural gas channel brick and the inner wall of the shell form an air channel; When the fuel gas is natural gas, the air passages of the two dual-purpose regenerative burners are respectively connected to the air, and the natural gas pipelines of the natural gas passage bricks are connected to the natural gas; When the fuel gas is blast furnace gas, the natural gas channel bricks are dismantled, the first dual-purpose regenerative burner is connected to the air, and the second dual-purpose regenerative burner is connected to the blast furnace gas.

2. The blast furnace gas and natural gas dual-purpose regenerative burner device according to claim 1 is characterized in that: When the fuel gas is natural gas, first grate bricks are respectively installed at the outlet ends of the air passages, and the first grate bricks are densely covered with ventilation holes.

3. The blast furnace gas and natural gas dual-purpose regenerative burner device according to claim 1 is characterized in that: When the fuel gas is blast furnace gas, the first dual-purpose regenerative burner is installed with the second grate brick, and the second dual-purpose regenerative burner is installed with the third grate brick.

4. The blast furnace gas and natural gas dual-purpose regenerative burner device according to claim 3 is characterized in that: The axes of the ventilation holes of the second grate brick and the third grate brick are arranged to intersect.

5. The blast furnace gas and natural gas dual-purpose regenerative burner device according to claim 1 is characterized in that: The natural gas channel brick includes a natural gas pipeline and a castable protective layer. The natural gas pipeline includes a main pipe, a branch pipe and an air inlet pipe. The main pipe is arranged vertically, and multiple branch pipes are connected to the main pipe. A castable protective layer is arranged outside the main pipe and the branch pipe. One end of the air inlet pipe is connected to the main pipe, and the other end of the air inlet pipe passes through the shell.

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