Method for floating seal of dry quenching coke charging device

Abstract

This invention relates to a method for floating sealing of a dry quenching coke loading device. The method employs a floating sealing device for the dry quenching coke loading device and provides a method for pressurizing the floating sealing space with nitrogen. The floating sealing device includes a floating cover, a gas path control system, a water seal groove, a floating cover sealing edge, a lower cone, a sealing cavity, and a lower cone sealing edge. The water seal groove is located below the lower cone, and floating covers are provided on both sides of the lower cone. A lower cone sealing edge (6) is installed on the outside of the lower cone opening, and a floating cover sealing edge (2) is installed on the bottom surface of the floating cover. This solution fundamentally improves the structure of the sealing cover of the dry quenching coke loading device by adopting a completely new floating sealing method, thereby increasing the service life of the sealing cover.

Description

Technical Field

[0001] This invention relates to a sealing method, specifically a floating sealing method for a dry quenching coke loading device, belonging to the technical field of electromechanical equipment. Background Technology

[0002] The dry quenching coke charging device is installed on the platform at the top of the dry quenching furnace. It mainly consists of mechanical parts such as hoppers, trolleys, furnace covers, drive units, and dust collection pipes. Working in conjunction with the elevator, it charges the red-hot coke from the coke pots into the dry quenching furnace. The structural diagram is shown below. Figure 1 As shown, it mainly has two functions: opening and closing the furnace cover and loading red coke into the hopper and then into the dry quenching furnace.

[0003] During the coke loading process of the dry quenching coke elevator, the coke can is lifted along a set path, loading the can full of red-hot coke into the dry quenching furnace. This process generates a large amount of dust. To prevent dust overflow, a high-temperature resistant asbestos cloth is used for flexible connection between the lower hopper of the loading device and the vertically movable sealing cover. The original sealing cover structure is as follows: Figure 2 As shown, the following problems exist during use: 1. Due to the high temperature of red coke during the coking process (around 1000℃), the service life of a single layer of high-temperature resistant asbestos cloth is very short, burning out within 50 days under normal operating conditions. If multiple layers of high-temperature resistant asbestos cloth are used, the vertical movement of the sealing cover is obstructed, and the sealing cover cannot be lifted by counterweight, which may cause the cover to get stuck in the water seal trough at the top of the furnace, leading to a serious equipment accident that affects dry quenching coke production. 2. After the high-temperature resistant asbestos cloth burns out, due to the continuous production characteristics of the coke oven, coupled with the high temperature at the top of the furnace, the maintenance load is large, the repair time is long, and the maintenance cost is high. Often, the burned high-temperature resistant asbestos cloth cannot be repaired in time, resulting in a large amount of dust overflowing during red coke loading, seriously affecting environmental protection. 3. The vertical movement of the sealing cover is achieved by lifting it up and down with four chains, and positioning is achieved by four 50mm diameter guide rods. Due to the flexible connection of the chains and the high temperature factors at the site, the floating sealing cover sways significantly from side to side during vertical movement, aggravating the damage to the high-temperature resistant asbestos cloth and causing the guide rods to easily get stuck. 4. Asbestos itself is a toxic and harmful substance, and its use is restricted due to environmental protection requirements.

[0004] The main reasons for the short service life of the sealing cover in the dry quenching coke loading device are as follows: 1. The red coke temperature of about 1000℃ during the coke loading process directly bakes the sealing materials such as asbestos cloth, making them very easy to burn; 2. The up-and-down movement of the sealing cover constantly pulls on the high-temperature resistant asbestos cloth, causing the asbestos cloth to break; 3. The use of multiple layers of high-temperature resistant asbestos cloth results in a small floating range of the sealing cover, which easily causes the guide rod to jam.

[0005] While some improvements and treatments have been made to the sealing of loading devices both domestically and internationally, these mainly focus on refining the material, thickness, and installation method of the seals. They haven't fundamentally solved problems such as short seal lifespan, dust leakage affecting the environment, and floating cover jamming impacting production. Therefore, a new solution is urgently needed to address these technical issues. Summary of the Invention

[0006] This invention addresses the problems existing in the prior art by providing a floating seal method for a dry quenching coke loading device. This technical solution eliminates the drawbacks of the original sealing cover during use, meets the requirements of safe and environmentally friendly dry quenching coke production, and fundamentally improves the structure of the sealing cover of the dry quenching coke loading device by adopting a brand-new floating seal method, thereby increasing the service life of the sealing cover.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: a method for floating sealing of a dry quenching coke loading device, the method employing a floating sealing device for the dry quenching coke loading device, and providing a method for pressurizing the floating sealing space with nitrogen.

[0008] As an improvement of the present invention, the floating sealing device includes a floating cover, an air circuit control system, a water seal groove, a floating cover sealing edge, a lower cone, a sealing cavity, and a lower cone sealing edge. The water seal groove is located below the lower cone, and floating covers are provided on both sides of the lower cone. A lower cone sealing edge is installed on the outside of the opening of the lower cone, and a floating cover sealing edge is installed on the bottom surface of the floating cover.

[0009] As an improvement of the present invention, the sealing blade edge of the lower cone bucket and the sealing blade edge of the floating cover are at the same height, and the sealing blade edge is made of metal. There is a floating gap between the sealing blade edge of the floating cover and the sealing blade edge of the lower cone bucket to ensure that the sealing blade edge has small deformation and is wear-resistant.

[0010] As an improvement of the present invention, four air inlets are designed on the upper and lower metal sealing blades of the bottom surface of the lower cone and the floating cover in the circumferential direction of the floating cover. When the upper and lower blades fit together to form a cavity, nitrogen can be injected into the sealing cavity by the air circuit control system.

[0011] As an improvement of the present invention, the pneumatic control system includes a gas source, a pressure reducing valve, a solenoid directional valve, and a speed regulating valve, wherein the pressure reducing valve and the solenoid directional valve are disposed between the gas source and the solenoid directional valve.

[0012] As an improvement of the present invention, the floating cover moves downward along the lower cone of the hopper of the loading device, and the lower edge of the floating cover is inserted into the water seal groove of the furnace top. The water in the water seal groove, the floating cover and the lower cone form a first layer of sealed space to prevent dust from overflowing from the dry quenching furnace. When the driving trolley is in place and the floating cover moves downward to the bottom, the sealing edge of the floating cover and the sealing edge of the lower cone fit together to form a sealing cavity, forming a second layer of sealing protection.

[0013] As an improvement of this invention, when the dry quenching coke charging device is in the closed limit position, the floating cover is in its original position, the electromagnetic reversing valve of the gas path control system is not working, and the gas path system does not fill the sealing cavity with sealing nitrogen. When the charging device moves from the closed limit position to the open limit position, the floating sealing cover of the charging device will move downward along the cam track. When the charging device reaches the open limit position, the sealing edge of the floating cover and the sealing edge of the lower cone hopper form a sealing cavity. At this time, the control system starts to operate the electromagnetic reversing valve, and the gas path system starts to fill the sealing cavity with high-pressure nitrogen, so that the sealing cavity of the charging device is filled with high-pressure nitrogen. This not only prevents the dust in the dry quenching coke oven from overflowing, but also replenishes nitrogen in the furnace, preventing oxygen-containing gas from entering the furnace. During the coke charging process, the gas path control system continuously fills the sealing cavity with gas. The charging pressure is controlled by the pressure reducing valve, and the charging volume is controlled by the speed regulating valve to ensure a slight positive pressure in the sealing cavity, blocking the emission of flue gas to the outside atmosphere, and ensuring that dust does not overflow when charging red coke. This is the third layer of sealing protection that this invention can produce. After coke loading is completed and the loading device moves away from the loading limit, the control system stops the solenoid reversing valve, and the gas system stops supplying high-pressure nitrogen to the soon-to-open sealed cavity.

[0014] Compared with the prior art, the present invention has the following advantages: 1) The floating sealing cover in this technical solution reduces wear on the sealing parts and extends the service life of the sealing parts by more than 3 times; 2) The application of the new sealing structure and high-pressure nitrogen sealing technology reduces the overflow of flue gas in the dry quenching furnace and the inflow of oxygen-containing air into the dry quenching coke oven; 3) The floating cover and the lower cone hopper are in planar and line contact, and can even achieve a non-contact state after proper adjustment, which can effectively prevent the floating cover from getting stuck and affecting the dry quenching coke production; 4) The optimization of the process saves a lot of energy costs, and the extension of the service life of the floating sealing cover greatly reduces equipment and maintenance costs. Attached Figure Description

[0015] Figure 1 Schematic diagram of the loading device;

[0016] Figure 2 - Original sealing cover structure diagram;

[0017] Figure 3 Schematic diagram of the floating sealing cover structure;

[0018] Figure 4 Structural diagram of the pressurized sealing equipment;

[0019] Figure 5 Control process of pressurized sealing device.

[0020] Wherein: 1-lower cone; 2-floating cover sealing blade edge; 3-floating cover; 4-sealing cavity. Detailed Implementation

[0021] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0022] Example 1: See Figure 1 A method for floating sealing of a dry quenching coke loading device is disclosed. This method employs a floating sealing device and provides a method for pressurizing the floating sealing space with nitrogen. The floating sealing device includes a floating cover 3, a gas path control system, a water seal groove, a floating cover sealing edge 2, a lower cone 1, a sealing cavity 4, and a lower cone 1 sealing edge. The water seal groove is located below the lower cone 1. Floating covers 3 are located on both sides of the lower cone 1. A lower cone 1 sealing edge is installed on the outer edge of the lower cone 1. A floating cover sealing edge 2 is installed on the bottom surface of the floating cover. The lower cone 1 sealing edge and the floating cover sealing edge 2 are at the same height and are made of metal. A floating gap exists between the floating cover sealing edge 2 and the lower cone 1 sealing edge to ensure minimal deformation and wear resistance of the sealing edge. Four air inlets are designed around the circumference of the floating hood, on the upper and lower metal sealing edges of the bottom of the cone hopper and the floating hood. When the upper and lower sealing edges fit together to form a cavity, nitrogen can be injected into the sealed cavity by the gas path control system. The gas path control system includes a gas source, a pressure reducing valve, an electromagnetic reversing valve, and a speed regulating valve. The pressure reducing valve and the electromagnetic reversing valve are located between the gas source and the electromagnetic reversing valve. The floating hood 3 moves downward along the lower cone hopper 1 of the loading device. The lower edge of the floating hood 3 is inserted into the water seal groove at the top of the furnace. The water in the water seal groove, the floating hood 3, and the lower cone hopper 1 form the first layer of sealed space to prevent dust from overflowing from the dry quenching furnace. When the drive trolley is in position and the floating hood 3 moves downward to the bottom, the sealing edge 2 of the floating hood and the sealing edge of the lower cone hopper fit together to form a sealed cavity 4, forming the second layer of sealing protection. When the dry quenching coke loading device is in the closed limit position, the floating hood is in its original position, the electromagnetic reversing valves 5-4 of the gas path control system do not work, and the gas path system does not inject sealing nitrogen into the sealed cavity 4. As the loading device moves from the closed limit to the open limit, the floating sealing cover 3 of the loading device will move downward along the cam track. When the loading device reaches the open limit, the sealing edge 2 of the floating cover and the sealing edge of the lower cone hopper form a sealing cavity 4. At this time, the control system starts the electromagnetic reversing valve 5-4, and the gas system begins to fill the sealing cavity with high-pressure nitrogen, so that the sealing cavity 4 of the loading device is filled with high-pressure nitrogen. This not only prevents the dust in the dry quenching coke oven from overflowing, but also replenishes the oven with nitrogen, preventing oxygen-containing gas from entering the oven. During the coke loading process, the gas system continuously fills the sealing cavity 4 with gas. The gas pressure is controlled by the pressure reducing valve 5-2, and the gas volume is controlled by the speed regulating valve 5-3 to ensure a slight positive pressure in the sealing cavity, blocking the emission of flue gas to the outside atmosphere and ensuring that dust does not overflow when loading red coke. This is the third layer of sealing protection that this invention can produce. After coke loading is completed and the loading device leaves the loading limit position, the control system stops the operation of the solenoid reversing valve 5-4, and the gas system will stop supplying high-pressure nitrogen to the soon-to-open sealed chamber 4.

[0023] Specific implementation method: Refer to Figure 3 — Figure 5 First refer to Figure 3 A floating sealing hood is designed and manufactured. A metal sealing blade is installed around the outer edge of the lower conical hopper of the dry quenching coke loading device. A metal sealing blade is also installed on the bottom surface of the floating hood. The upper and lower metal sealing blades on the bottom surface of the conical hopper and the floating hood are at the same height. Metal sealing blades are used, and there is a floating gap between the upper and lower blades to ensure minimal deformation and wear resistance. Four air inlets are designed around the circumference of the floating hood. When the upper and lower blades fit together to form a cavity, nitrogen can be injected into the sealing cavity under the control of the air circuit control system. The air circuit control system consists of an electromagnetic reversing valve, a pressure reducing valve, a speed regulating valve, an air source, and an electrical control system, with a structure similar to [previous designation]. Figure 4 As shown.

[0024] During the dry quenching process, when coke is loaded into the dry quenching furnace, the floating cover 3 described in this invention moves downward along the lower cone hopper 1 of the loading device. The lower edge of the floating cover 3 is inserted into the water seal groove at the top of the furnace. The water in the water seal groove, the floating cover 3, and the lower cone hopper 1 form a first layer of sealed space to prevent dust from overflowing from the dry quenching furnace. When the drive trolley is in position and the floating cover 3 moves downward to the bottom, the sealing edge 2 of the floating cover and the sealing edge of the lower cone hopper fit together to form a sealing cavity 4, forming a second layer of sealing protection.

[0025] To achieve a better sealing effect, an airtight barrier device is used to better block the emission of pollutants and prevent air from entering the dry quenching coke oven during the coking process. Its structure is based on... Figure 4 Logic control flow reference Figure 5 When the dry quenching coke charging device is in the closed limit position, the floating cover is in its original position, the solenoid reversing valve 5-4 of the gas circuit control system is not working, and the gas circuit system does not fill the sealing cavity 4 with sealing nitrogen. When the charging device moves from the closed limit position to the open limit position, the floating sealing cover 3 of the charging device will move downward along the cam track. When the charging device reaches the open limit position, the sealing edge 2 of the floating cover and the sealing edge of the lower cone bucket form the sealing cavity 4. At this time, the control system starts to work the solenoid reversing valve 5-4, and the gas circuit system starts to fill the sealing cavity with high-pressure nitrogen, so that the sealing cavity 4 of the charging device is filled with high-pressure nitrogen. This not only prevents the dust in the dry quenching coke oven from overflowing, but also replenishes nitrogen into the furnace, preventing oxygen-containing gas from entering the furnace. During coke loading, the gas control system continuously fills the sealed cavity 4 with gas. The gas pressure is controlled by the pressure reducing valve 5-2, and the gas volume is controlled by the speed regulating valve 5-3. This ensures a slight positive pressure within the sealed cavity, preventing the emission of flue gas into the external atmosphere and ensuring that smoke and dust do not overflow when loading red coke. This is the third layer of sealing protection provided by this invention. After coke loading is completed and the loading device moves away from the loading limit position, the control system stops the operation of the electromagnetic reversing valve 5-4, and the gas system stops supplying high-pressure nitrogen to the soon-to-be-opened sealed cavity 4.

[0026] This invention is an innovation on the traditional floating sealing structure of dry quenching coke charging device. After implementation, the service life of the floating sealing cover of the dry quenching coke charging device will be significantly extended, fully meeting the annual maintenance cycle of dry quenching coke. It avoids the safety hazards and environmental impact caused by the online maintenance of the original floating sealing asbestos cloth burning, effectively prevents the floating cover from getting stuck at the top and bottom, ensures the stable and smooth operation of dry quenching coke production, and achieves the effect of protecting the environment from pollution.

[0027] This embodiment only illustrates the method of forming a cavity and pressurizing the cavity with nitrogen when the upper and lower blade edges of the floating sealing device are perpendicular. Other methods that use similar planes or curved surfaces for sealing are also within the scope of protection of this patent.

Claims

1. A method for floating sealing of a dry quenching coke loading device, characterized in that, This method employs a floating sealing device in a dry quenching coke loading apparatus and provides a method for pressurizing the floating sealing space with nitrogen. The floating sealing device includes a floating cover, an air circuit control system, a water seal groove, a floating cover sealing edge, a lower cone, a sealing cavity, and a lower cone sealing edge. The water seal groove is located below the lower cone, and floating covers are provided on both sides of the lower cone. A lower cone sealing edge is installed on the outside of the lower cone opening, and a floating cover sealing edge is installed on the bottom surface of the floating cover. The sealing blades of the lower cone bucket and the floating cover are at the same height and both use metal sealing blades. There is a floating gap between the sealing blades of the floating cover and the sealing blades of the lower cone bucket to ensure that the sealing blades are not deformed and are wear-resistant. Four air inlets are designed in the circumferential direction of the floating cover. When the upper and lower metal sealing blades of the lower cone and the bottom surface of the floating cover fit together to form a sealed cavity, the air circuit control system controls the filling of nitrogen into the sealed cavity. The pneumatic control system includes a gas source, a pressure reducing valve, a solenoid directional valve, and a speed regulating valve, wherein the pressure reducing valve is located between the gas source and the solenoid directional valve. The floating cover moves downward along the lower cone of the hopper of the loading device. The lower edge of the floating cover is inserted into the water seal groove at the top of the furnace. The water in the water seal groove, the floating cover, and the lower cone form the first layer of sealed space to prevent dust from overflowing from the dry quenching furnace. When the drive trolley is in place and the floating cover moves downward to the bottom, the sealing edge of the floating cover and the sealing edge of the lower cone fit together to form a sealing cavity, forming the second layer of sealing protection. When the dry quenching coke loading device is in the closed limit position, the floating cover is in its original position, the solenoid reversing valve of the gas path control system is not working, and the gas path control system does not fill the sealing cavity with sealing nitrogen. When the loading device moves from the closed limit position to the open limit position, the floating cover of the loading device will move downward along the cam track. When the loading device reaches the open limit position, the sealing edge of the floating cover and the sealing edge of the lower cone bucket form a sealing cavity. At this time, the gas path control system starts to work the solenoid reversing valve and begins to fill the sealing cavity with high-pressure nitrogen, so that the sealing cavity of the loading device is filled with high-pressure nitrogen. During the coke loading process, the gas path control system continuously fills the sealing cavity with gas, the gas pressure is controlled by the pressure reducing valve, and the gas volume is controlled by the speed regulating valve. After the coke loading is completed, after the loading device leaves the loading limit position, the gas path control system stops working the solenoid reversing valve and stops replenishing the sealing cavity with high-pressure nitrogen.

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