Sintering material surface fuel gas injection device and sintering injection system

Abstract

The utility model discloses a sintering material surface fuel gas injection device and a sintering injection system, and belongs to the technical field of sintering. The sintering material surface fuel gas injection device comprises a fuel gas injection pipe which is located above the sintering material surface, a fuel gas injection opening is formed in the lower end of the fuel gas injection pipe and used for injecting fuel gas to the sintering material surface, an anti-escape component is arranged on the fuel gas injection pipe and comprises an anti-escape plate arranged on the outer side of the fuel gas injection pipe, and the anti-escape plate is provided with a gas inlet and a gas outlet. The anti-escape plates are vertically and symmetrically distributed on the outer walls of the fuel gas injection pipes, the two anti-escape plates are obliquely arranged downwards, and a gap is formed between the anti-escape plates between every two adjacent fuel gas injection pipes. The anti-escape plate is used for blocking fuel gas ejected from the fuel gas injection pipe, so that micro-negative pressure is formed at an included angle between a charge level and the anti-escape plate, and a negative pressure gap is further formed among the sintering charge level, the fuel gas injection pipe and the anti-escape plate through the air bellow below the charge level, so that a wind zone is formed for blocking fuel gas escape, diffusion flames are formed as much as possible, and the service life of the sintering furnace is prolonged. Premixed flames are prevented from being formed, and explosion is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of sintering, and more specifically relates to a sintering material surface fuel gas injection device and a sintering injection system. Background Art

[0002] Flame is the reaction zone where the fuel gas and oxidant (air or oxygen) undergo a violent oxidation reaction, accompanied by high temperature and luminescence. Depending on whether the fuel gas is premixed with air, the combustion mode can be divided into diffusion combustion and premixed combustion. In diffusion combustion, the combustible gas is ejected from the nozzle and diffuses and mixes with the oxygen in the air at the nozzle while burning.

[0003] During the sintering process, an exhaust fan is usually installed below the sintering material surface to form a slight negative pressure on the sintering material surface to promote the intake of gas. However, due to factors such as too thick material layer, too small main exhaust door, over-melted material surface, and insufficient solvent ratio, the local material layer in the injection section has poor air permeability and the negative pressure value of the material surface is not high enough, causing the gas to escape upward. When the gas cannot be inhaled by the material surface and escapes upward in large quantities, the gas concentration in the workshop will increase, causing a great safety hazard.

[0004] After searching, patent CN110343852A discloses a gas escape prevention system for a blowing hood and a control method thereof, comprising: a blowing hood, located on the top of a sintering machine trolley; a blowing pipe row, arranged inside the blowing hood and above the sintering machine trolley, for blowing combustible gas to the sintering material surface of the sintering machine trolley; a gas pipeline, for conveying combustible gas to the blowing pipe row; an airflow device, comprising a driving cylinder and a rotating impeller device, the rotating impeller device being arranged in the top area of the blowing hood, the rotating impeller device being used to drive external air to generate an airflow and input the generated airflow from the top of the blowing hood downward into the inside of the blowing hood, so as to form a wind pressure zone above the blowing pipe row that prevents the combustible gas from passing upward. However, the device has a complex structure and high maintenance cost on the one hand, and a limited gas escape prevention effect on the other hand.

[0005] Patent CN108118144A discloses an adaptive adjustable anti-escape gas injection device. An adjustable anti-escape device is provided above the gas injection pipe row of this device. The adjustable anti-escape device includes an adjusting load-bearing member, an anti-escape plate, a three-stage pull rope, a two-stage pull rope, a lifting rod, a first-stage pull rope, a fixed pulley, and a lifting drive device. Among them, the adjusting load-bearing member is installed above the gas injection pipe row of the gas injection pipe. The anti-escape plate is installed on both sides of the adjusting load-bearing member. One end of the two-stage pull rope is connected to the anti-escape plates on both sides of the adjusting load-bearing member through the three-stage pull rope, and the other end is connected to the upper lifting rod. One end of the first-stage pull rope is connected to the lifting rod, and the other end bypasses the fixed pulley and is connected to the lifting drive device. This device calculates the real-time escape coefficient based on the real-time data measured by the material surface negative pressure monitoring device and the gas flow monitoring device, and then calculates the angle that the current anti-escape plate should form with the horizontal plane and the height that the side edge of the anti-escape plate needs to be lifted. However, the anti-escape plate of this patent is arranged above the gas injection pipe row. Due to the airflow disturbance above the material surface, during the actual operation, the gas will bypass the anti-escape plate, and partial gas overflow will still occur.

[0006] The solutions in the above patents cannot effectively prevent gas escape. Summary of the Invention

[0007] 1. Problems to be Solved

[0008] Aiming at the problem of gas overflow in the existing device, the first object of the present utility model is to provide a sintering material surface gas injection device, which can effectively reduce gas overflow.

[0009] The second object of the present utility model is to provide a sintering injection system, which can effectively reduce gas overflow, promote the formation of a diffusion flame, and prevent explosion.

[0010] 2. Technical Solutions

[0011] To solve the above problems, the present utility model adopts the following technical solutions.

[0012] The sintering material surface gas injection device of the present utility model includes a gas injection pipe located above the sintering material surface and an anti-escape component. The lower end of the gas injection pipe is provided with a gas injection outlet. The anti-escape component includes an anti-escape plate arranged outside the gas injection pipe. The anti-escape plates are distributed on both sides of the gas injection pipe, and the anti-escape plates are arranged in a downward inclined manner. Gas is ejected from the gas injection outlet, so that a micro negative pressure area is formed between the anti-escape plate and the gas injection pipe. Preferably, the angle between the two anti-escape plates is 20° - 90°.

[0013] Due to the blocking of the anti-escape plate, between the gas injection pipe and the anti-escape plate, especially at the included angle, the gas is ejected quickly from the injection outlet of the gas injection pipe, accelerating the air flow in this area, thereby forming a micro negative pressure area.

[0014] Furthermore, during the sintering process, the material surface is in a fluctuating state. To ensure that the gas does not escape, the height from the lower end of the anti-escape plate to the material surface is 30 - 80 mm, and the height from the outlet of the gas injection pipe to the material surface is 30 - 100 mm, so as to form a diffused flame as much as possible, avoid forming a premixed flame, and prevent explosion; the diameter of the gas injection pipe is 32 - 80 mm.

[0015] Furthermore, there is a gap between the anti-escape plates of two adjacent gas injection pipes, and the gap is preferably 200 - 400 mm.

[0016] There is a gap between adjacent anti-escape plates. Through the air box at the lower part of the material surface, a negative pressure gap is formed between the sintering material surface, the gas injection pipe and the anti-escape plate, forming an air belt to block the gas from escaping. Even the gas that cannot be sucked into the material surface in a short time can be blocked by the upper anti-escape plate and blown into the material layer again through the air belt.

[0017] Furthermore, the upper end of the anti-escape plate is connected to the pipe wall of the gas injection pipe, and the connection point is located at the middle and below of the pipe wall of the gas injection pipe.

[0018] In a possible implementation manner of the present utility model, the upper end of the anti-escape plate is welded to the pipe wall of the gas injection pipe.

[0019] In another possible implementation manner, the anti-escape plate is sleeved above the gas injection pipe, and it further includes a connecting plate connecting two anti-escape plates. The connecting plate is attached to the upper end of the gas injection pipe, and the connecting plate and the anti-escape plate are clamped on the outside of the gas injection pipe, so that the two anti-escape plates are vertically symmetrically distributed on both sides of the gas injection pipe.

[0020] Furthermore, the anti-escape plate is made of ordinary carbon steel with a thickness of 2 - 4 mm.

[0021] A sintering injection system of the present utility model including the sintering material surface gas injection device includes a sintering machine trolley and a gas injection device. The sintering machine trolley is provided with a sintering material surface, and the gas injection device includes a gas pipeline and an anti-escape component.

[0022] The gas pipeline includes a gas main pipe, a gas branch pipe and a gas injection pipe. The gas pipeline is provided with an anti-escape component. One end of the gas branch pipe is connected to the gas main pipe, and the other end is connected to the gas injection pipe. A gas distributor is provided between the gas main pipe and the gas branch pipe, and gas is injected into the sintering material surface through the gas injection pipe.

[0023] The sintering injection system is further provided with a sealing cover, and the sintering machine trolley and the gas injection pipe are located in the sealing cover.

[0024] Furthermore, the gas injection pipes are arranged above the sintering machine trolley. Multiple gas injection pipes form a group, and at least one group of gas injection pipes is arranged on the sintering machine trolley. The direction of the gas injection outlet is perpendicular to the running direction of the sintering machine trolley, and the gas injection pipes are arranged horizontally in the running direction of the sintering trolley, so that the gas injection amount above the sintered ore on the sintering machine trolley at the same progress is consistent, the gas injection outlet and the sintering material surface are kept at the best height, the gas amount at the material surface is ensured to be uniform, and then the gas concentration sucked into the material layer is consistent, ensuring the auxiliary sintering effect.

[0025] Furthermore, a combustible gas detector is provided above or on the side of the gas injection pipe for detecting whether the gas overflows.

[0026] Furthermore, an air extraction box is provided below the sintering material surface, and a pressure transmitter is provided on the air extraction box.

[0027] Furthermore, a pneumatic quick cut valve is provided at the inlet of the gas main pipe, and the pneumatic quick cut valve is connected to the combustible gas detector, the air extraction box and the pressure transmitter.

[0028] Furthermore, a flow meter, a pressure detector and an automatic regulating valve are also provided at the inlet of the gas main pipe. The pressure detector, the flow meter and the automatic regulating valve are connected to prevent the gas inlet amount from being too large, resulting in too high pressure in the pipe, and the flow and pressure in the gas main pipe are regulated through the automatic regulating valve.

[0029] Furthermore, a relief valve is provided at the end of the gas distributor. When the pressure at the end of the gas distributor exceeds the set value, a certain amount of gas is discharged.

[0030] Furthermore, the inlet of the gas main pipe is connected to a nitrogen purging interface. When the pipeline needs to be purged, the nitrogen purging interface is connected, and nitrogen is introduced into the pipeline, which can effectively remove impurities and residual gas in the pipeline and ensure the purity of the pipeline.

[0031] 3. Beneficial effects

[0032] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0033] (1) A sintering material surface gas injection device of the present utility model includes a gas injection pipe and anti-escape plates vertically and symmetrically distributed on both sides of the gas injection pipe. The two anti-escape plates are arranged in a downward inclined manner. The gas ejected from the gas injection pipe is blocked by the anti-escape plates, and a micro negative pressure can be formed between the gas injection pipe and the anti-escape plates, especially at the included angle, accelerating the inflow of air to prevent the gas from escaping;

[0034] (2) The gas injection device for the sintering material surface of the present utility model has a gap provided between adjacent anti-escape plates. Through the air box at the lower part of the material surface, a negative pressure gap is formed among the sintering material surface, the gas injection pipe and the anti-escape plates, forming an air belt to block the escape of gas.

[0035] (3) The sintering injection system of the present utility model effectively reduces the external overflow of gas by introducing anti-escape plates, promotes the formation of a diffusion flame, avoids the formation of a premixed flame, reduces the risk of gas combustion and explosion, and can improve the quality of sintered ore and reduce the sintering energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The technical solution of the present utility model will be further described in detail below in conjunction with the drawings and embodiments. However, it should be understood that these drawings are only designed for the purpose of explanation and therefore do not limit the scope of the present utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0037] Figure 1 is a schematic structural diagram of the sintering injection system of the present utility model;

[0038] Figure 2 is a schematic structural diagram of the anti-escape component in Embodiment 1 of the present utility model;

[0039] Figure 3 is a schematic diagram of the working principle of the anti-escape component of the present utility model;

[0040] Figure 4 is a schematic structural diagram of the anti-escape component in Embodiment 2 of the present utility model;

[0041] In the figure: 1, gas main pipe; 2, gas branch pipe; 3, gas injection pipe; 4, anti-escape plate;

[0042] a, air; b, gas; c, sintering material surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The following detailed description of the present utility model and the exemplary embodiments can be better understood in conjunction with the drawings, in which the elements and features of the present utility model are identified by reference numerals.

[0044] Embodiment 1

[0045] The sintering injection system of this embodiment includes a sintering machine trolley, a sealing cover and a gas injection device. The sintering machine trolley is provided with a sintering material surface. The gas injection device includes a gas pipeline and an anti-escape component. The above-mentioned gas can be blast furnace gas, coke oven gas or natural gas, as well as other combustible gases with a calorific value above 700 kcal.

[0046] The gas pipeline is as Figure 1As shown, it includes a gas main pipe 1, a gas branch pipe 2, and a gas injection pipe 3. One end of the gas branch pipe 2 is connected to the gas main pipe 1, and the other end is connected to the gas injection pipe 3. A gas distributor is provided between the gas main pipe 1 and the gas branch pipe 2. The gas injection pipe 3 is arranged above the sintering machine trolley. The lower end of the gas injection pipe 3 is provided with a gas injection outlet, and gas blows the sintering material surface through the gas injection outlet. The sintering machine trolley and the gas injection pipe 3 are located within a sealing hood.

[0047] In Embodiment 1, multiple gas injection pipes 3 are grouped together. A group of gas injection pipes 3 is arranged on the sintering machine trolley. The direction of the gas injection outlet is perpendicular to the running direction of the sintering machine trolley, and the gas injection pipes 3 are arranged horizontally in the running direction of the sintering trolley.

[0048] An anti-escape component is provided on the gas injection pipe 3. The anti-escape component includes an anti-escape plate 4 provided on the outer side of the gas injection pipe 3. As Figure 2 shown, the anti-escape plates 4 are vertically symmetrically (left and right symmetrically) distributed on the outer wall of the gas injection pipe 3, and the two anti-escape plates 4 are arranged in a downward inclined manner. The angle between the two anti-escape plates 4 is 90°.

[0049] The height of the lower end of the anti-escape plate 4 from the material surface is 50 mm, and the height of the gas injection outlet from the material surface is 80 mm, so as to form a diffused flame as much as possible, avoid forming a premixed flame, and prevent explosion; the pipe diameter of the gas injection pipe 3 is 32 mm.

[0050] Furthermore, a gap is provided between the anti-escape plates 4 of two adjacent gas injection pipes 3. The gap is preferably 200 mm.

[0051] As Figure 3 shown, gas sprays out from the gas injection outlet. Due to the blockage of the anti-escape plate 4, a microcirculation is formed between the gas injection pipe 3 and the anti-escape plate 4, especially at the included angle, generating a micro-negative pressure of about 10 pa. Air enters between the gas injection pipes 3 from the gap between the gas injection pipes 3. Due to the large air flow rate, it further prevents gas from escaping from the gap between the gas injection pipes 3.

[0052] In this embodiment, the anti-escape plate 4 is made of a common carbon steel plate with a thickness of 3 mm.

[0053] The upper end of the anti-escape plate 4 is connected to the pipe wall of the gas injection pipe 3, and the connection point is located at the middle and below positions of the pipe wall of the gas injection pipe 3.

[0054] In Embodiment 1, the upper end of the anti-escape plate 4 is welded to the pipe wall of the gas injection pipe 3, and the welding point is located at the 1 / 2 height of the pipe wall of the gas injection pipe 3.

[0055] Above the gas injection pipe 3, a combustible gas detector is provided to monitor in real time whether there is gas leakage in the injection device.

[0056] Below the sintering material surface, an air extraction box is provided, and a pressure transmitter is provided on the air extraction box.

[0057] At the inlet of the gas main pipe 1, a pneumatic quick cut-off valve is provided, and the pneumatic quick cut-off valve is connected to the combustible gas detector, the pressure transmitter, and the induced draft fan.

[0058] Among them, a combustible gas detector is set every 5 - 10 m to monitor in real time whether there is gas leakage in the injection device. When the concentration of combustible gas is too high, the pneumatic quick cut-off valve is automatically cut off.

[0059] The pressure transmitter is connected to the pneumatic quick cut-off valve. When the absolute value of the main extraction air pressure is less than 5% - 10% of the standard pressure during operation, an alarm is given. When the absolute value of the main extraction air pressure is less than 15% - 20% of the standard pressure during operation, the pneumatic quick cut-off valve is automatically cut off.

[0060] When the valve position opening of the air extraction box is less than 10 - 15% of the standard valve position during operation, the opening is adjusted in time. When it is less than 20%, this group of injection devices is closed.

[0061] The sintering injection system is also provided with an induced draft fan, and the induced draft fan is connected to the pneumatic quick cut-off valve. When the operating frequency of the induced draft fan is less than 10% of the standard operating frequency, an alarm is given. When it is less than 20%, the pneumatic quick cut-off valve is automatically cut off.

[0062] At the inlet of the gas main pipe 1, a flow meter, a pressure detector, and an automatic regulating valve are also provided. The pressure detector, the flow meter, and the automatic regulating valve are connected to prevent the gas inflow from being too large, resulting in too high pressure in the pipe. The flow and pressure in the gas main pipe 1 are adjusted through the automatic regulating valve.

[0063] A relief valve is provided at the end of the gas distributor. When the pressure at the end of the gas distributor exceeds the set value, a certain amount of gas is discharged.

[0064] The inlet of the gas main pipe 1 is connected to a nitrogen purging interface. When the pipeline needs to be cleaned, the nitrogen purging interface is connected, and nitrogen is introduced into the pipeline, which can effectively remove impurities and residual gas in the pipeline and ensure the purity of the pipeline.

[0065] Embodiment 2

[0066] The structure of Embodiment 2 is basically the same as that of Embodiment 1, as Figure 2As shown in the figure, the difference is that the anti-escape plate 4 is sleeved above the gas injection pipe 3. It further includes a connecting plate connecting the two anti-escape plates 4. The connecting plate is attached to the upper end of the gas injection pipe 3. The connecting plate and the anti-escape plate 4 are clamped on the outside of the gas injection pipe 3, so that the two anti-escape plates 4 are vertically symmetrically distributed on both sides of the gas injection pipe 3, and then fixed by spot welding.

[0067] The contact point between the anti-escape plate 4 and the gas injection pipe 3 is below the 1 / 2 height of the gas injection pipe 3, and the connecting plate and the anti-escape plate 4 are more tightly clamped on the outside of the gas injection pipe 3.

[0068] Embodiment 3

[0069] The structure of Embodiment 3 is basically the same as that of Embodiment 1. The difference is that the angle between the two anti-escape plates 4 is 20°.

[0070] The height of the lower end of the anti-escape plate 4 from the material surface is 50 mm, the height of the gas injection outlet from the material surface is 80 mm, and the pipe diameter of the gas injection pipe 3 is 45 mm.

[0071] There is a gap between the anti-escape plates 4 between two adjacent gas injection pipes 3. The gap is preferably 400 mm.

[0072] Embodiment 4

[0073] The structure of Embodiment 4 is basically the same as that of Embodiment 1. The difference is that the angle between the two anti-escape plates 4 is 60°.

[0074] The height of the lower end of the anti-escape plate 4 from the material surface is 50 mm, the height of the gas injection outlet from the material surface is 80 mm, and the pipe diameter of the gas injection pipe 3 is 45 mm.

[0075] There is a gap between the anti-escape plates 4 between two adjacent gas injection pipes 3. The gap is preferably 300 mm.

Claims

1. A gas injection device for a sintering material surface, comprising a gas injection pipe (3) located above the sintering material surface, and a gas injection outlet is opened at the lower end of the gas injection pipe (3). It is characterized in that, It further includes an anti-escape component. The anti-escape component includes an anti-escape plate (4) provided on the outer side of the gas injection pipe (3). The anti-escape plates (4) are distributed on both sides of the gas injection pipe (3), and the anti-escape plates (4) are arranged in a downward inclination. Gas is ejected from the gas ejection port, so that a micro-negative pressure area is formed between the anti-escape plate (4) and the gas injection pipe (3).

2. The sintering material surface gas injection device according to claim 1, wherein, The included angle between the anti-escape plates (4) on both sides of the gas injection pipe (3) is 20°-90°.

3. The sintering material surface gas injection device according to claim 1, characterized in that, The height from the lower end of the anti-escape plate (4) to the sintered material surface is 30-80 mm, and the height from the gas ejection port to the material surface is 30-100 mm.

4. The sintering material surface gas injection device according to claim 1, characterized in that There is a gap between the anti-escape plates (4) between two adjacent gas injection pipes (3), and the gap is 200-400 mm.

5. The sintering material surface gas injection device according to claim 1, characterized in that, The upper end of the anti-escape plate (4) is connected to the pipe wall of the gas injection pipe (3), and the connection point is at or below the 1 / 2 height of the pipe wall of the gas injection pipe (3).

6. The sintering material surface gas injection device according to claim 5, characterized in that, The upper end of the anti-escape plate (4) is welded to the pipe wall of the gas injection pipe (3).

7. The sintering material surface gas injection device according to claim 5, characterized in that, The anti-escape plate (4) is sleeved above the gas injection pipe (3). It further includes a connecting plate connecting two anti-escape plates (4), and the connecting plate and the anti-escape plate (4) are clamped on the outer side of the gas injection pipe (3).

8. A sintering and injection system, which comprises a sintering machine trolley and a gas injection device. The sintering material surface is located on the sintering machine trolley. The gas injection device includes a gas main pipe (1), a gas branch pipe (2), and a gas injection pipe (3). One end of the gas branch pipe (2) is connected to the gas main pipe (1), and the other end is connected to the gas injection pipe (3). The lower end of the gas injection pipe (3) is provided with a gas injection outlet, and it is characterized in that, The gas injection device further includes an anti-escape component. The anti-escape component includes an anti-escape plate (4) provided on the outer side of the gas injection pipe (3). The anti-escape plates (4) are distributed on both sides of the gas injection pipe (3), and the anti-escape plates (4) are arranged in a downward inclination. Gas is ejected from the gas ejection port, so that a micro-negative pressure area is formed between the anti-escape plate (4), the gas injection pipe (3).

9. The sintering and injection system according to claim 8, wherein The sintering injection system is also provided with a sealing cover, and the sintering machine trolley and the gas injection pipe (3) are located in the sealing cover.

10. The sintering and injection system according to claim 9, wherein, A pneumatic quick cut-off valve is provided at the inlet of the gas main pipe (1); a combustible gas detector is provided above or on the side of the gas injection pipe (3); an air extraction box is provided below the sintered material surface, and a pressure transmitter is provided on the air extraction box; the pneumatic quick cut-off valve is connected to the combustible gas detector, the air extraction box and the pressure transmitter.

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