A method for rapidly treating the accretions in a shaft furnace

Abstract

The present application provides a kind of new method for quickly processing vertical furnace clinker in furnace, belongs to the field of vertical furnace.The present application when finding that there is clinker sign in vertical furnace, first, the material in furnace is discharged, hot clinker is discharged to cold air branch pipe horizontal corresponding area with material in furnace;The other end of steel pipe is inserted into the position where hot clinker stays in furnace along the hole outside cold air main pipe, and contacts with hot clinker;Repeatedly cool, until the color of entire hot clinker changes from red to black, further crushes the hot clinker that naturally cracks after cooling, and discharges the present application can quickly, thoroughly process hot clinker in vertical furnace, reduce the influence on production;Eliminate the risk brought by limited space operation when post personnel enter furnace to process hot clinker before;Avoid spraying water on furnace when processing clinker in furnace before, cause the refractory in furnace to be chilled under high temperature condition and cause fragmentation damage, effectively protect the refractory in furnace, prolong the service life of refractory in furnace.

Description

Technical Field

[0001] This invention relates to a novel method for rapidly processing agglomerates inside a vertical shaft furnace, belonging to the field of vertical shaft furnaces. Background Technology

[0002] In the vertical shaft furnace operation area of ​​the ironmaking plant, because the first-phase vertical shaft furnace is in the final stage of production, the upper and middle fire channel openings inside the furnace often experience integral hot-melt agglomeration, which seriously affects the smooth operation of the furnace and causes production losses. Generally, to deal with this problem, water is sprayed onto the furnace while material is discharged downwards until all unagglomerated material is emptied. Then, the manhole door at the bottom of the furnace is opened, and water spraying continues to cool the hot-melt agglomerates and the furnace wall. Once the furnace temperature drops below 40°C, workers in groups of four, wearing high-temperature resistant aluminum foil protective suits, take turns entering the furnace to manually break up the agglomerates using tools such as sledgehammers, steel chisels, and electric picks. During the breaking process, water spraying is still used during the breaks between personnel rotations to cool the hot-melt agglomerates, and the discharge rollers are activated to remove the manually broken agglomerates from the furnace. The entire process used to take at least 24 hours. This new method involves first discharging the material downwards from the furnace. During the descent of the charge, holes are simultaneously made at the pre-retention positions of the hot melt blocks, specifically on the outer wall of the cooling air main pipe corresponding to the cold air branch pipe of the furnace body. When the hot melt blocks descend with the charge to the corresponding position of the cold air branch pipe, the operation of the discharge toothed rollers is stopped. At the same time, a pre-connected water pipe is inserted into the hole to force-cool the hot melt blocks, causing them to spontaneously combust and explode after cooling. Under the crushing action of the discharge toothed rollers under the furnace, the hot melt blocks are broken into small pieces smaller than the gap between the discharge toothed rollers and then discharged from the furnace. Without affecting the normal material feeding, a second loading of the furnace is carried out to organize production. After using this method, the processing time for hot melt blocks is reduced from the original 24 hours to less than 8 hours. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and to provide a new method for rapidly processing agglomerates inside a vertical shaft furnace.

[0004] The objective of this invention is achieved through the following technical solution: A novel method for rapidly processing agglomerates inside a vertical shaft furnace, comprising the following specific steps: Step 1: When signs of agglomeration are found inside the vertical shaft furnace, first discharge the material inside the furnace, then observe the material discharge situation inside the furnace. After the hot melt blocks are discharged with the material inside the furnace to the corresponding horizontal area of ​​the cold air branch pipe of the cold air duct, stop the venting operation. Step 2: Make square holes at intervals on the outside of the main cold air duct, corresponding to the position of the straight cold air duct, and install a sealable door that can be opened and closed at the hole; Step 3: Connect one end of the flexible hose to the cooling water and the other end of the flexible hose to one end of the steel pipe; insert the other end of the steel pipe through the opening on the outside of the main cold air pipe through the cold air branch pipe and into the position where the hot melt block stays in the furnace, and make contact with the hot melt block. Step 4: Open the cooling water valve. Cold water enters the furnace through the connected flexible hose and steel pipe to force the hot melt block to cool down. Step 5: Observe the cooling of the hot melt block through the furnace door. Stop spraying water when the color of the forced cooling point of the hot melt block changes from red to black, and move the cooling water pipe to the next position to continue forced cooling. Repeat this process of changing positions until the color of the entire hot melt block changes from red to black. Then stop forced cooling and seal the opening on the outside of the main cold air pipe. Step Six: Start the furnace material crushing toothed roller at the bottom of the furnace and continuously adjust the working frequency of the frequency converter of the vibrating feeder. Continue the material discharge operation in the furnace. After all the cooled hot melt blocks are located on the upper part of the toothed roller, adjust the toothed roller to form the internal meshing and external meshing operation state at the same time, and further crush the hot melt blocks that have naturally cracked after cooling and discharge them into the furnace.

[0005] This invention discloses a novel method for rapidly processing agglomerates inside a vertical shaft furnace. The diameter of the cold air branch pipe is DN200mm, the diameter of the cold air main pipe is DN700mm, the diameter of the opening is 100mm±20mm, and the diameter of the steel pipe is DN50mm.

[0006] This invention provides a novel method for rapidly processing agglomerates inside a vertical shaft furnace, wherein the length of the steel pipe is greater than the sum of the lengths of the main cold air pipe, the branch cold air pipes, and the furnace wall.

[0007] This invention provides a novel method for rapidly processing agglomerates inside a vertical shaft furnace. The simultaneous operation of the internal and external meshing is achieved by adjusting the rotation direction of two adjacent toothed rollers so that the rotation direction of each toothed roller is opposite to that of the adjacent toothed rollers on both sides.

[0008] The beneficial effects of this invention's novel method for rapidly processing agglomerates inside a vertical shaft furnace are as follows: 1. It can quickly and thoroughly process the hot melt blocks in the vertical furnace within 4 to 8 hours, rapidly restore production, and reduce the impact on production; 2. Easy to operate, no need to open the manhole at the bottom of the furnace body, and the cold air duct can be used for a long time after a single opening; 3. It eliminates the risks associated with personnel entering the furnace to perform confined space operations when handling hot melt blocks.

[0009] 4. This method avoids the previous practice of spraying water on the furnace when dealing with caking inside the furnace, which caused the refractory material inside the furnace to be rapidly cooled at high temperatures, resulting in cracking and damage. It can effectively protect the refractory material inside the furnace and extend its service life.

[0010] 5. Reduce the labor intensity of personnel handling caking in the furnace and ensure operational safety. Attached Figure Description

[0011] Figure 1 This is a front view of the new method for rapidly processing agglomerates inside a vertical shaft furnace according to the present invention.

[0012] Figure 2 This is a top view of the new method for rapidly processing agglomerates inside a vertical shaft furnace according to the present invention.

[0013] Figure 3 This is a side view of the new method for rapidly processing agglomerates inside a vertical shaft furnace according to the present invention. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings: This embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods are given, but the protection scope of the present invention is not limited to the following embodiments.

[0015] Example 1: As Figure 1-3 As shown in this embodiment, a novel method for rapidly processing agglomerates inside a vertical shaft furnace is described: 1. When signs of agglomeration are detected in the vertical shaft furnace, stop the upper pelletizing operation but do not stop the discharge crushing toothed rollers below the furnace. Continue to discharge the material in the furnace, observe the material discharge situation, and control the discharge speed by adjusting the set value of the frequency converter of the vibrating feeder in the hopper below the crushing toothed rollers. This will allow the hot melt blocks to descend with the material in the furnace to the outlet of the cold air branch pipe, ensuring that the upper surface of the hot melt blocks is at the same height as the center of the cold air branch pipe in the horizontal direction. Stop the toothed rollers and adjust the frequency converter of the vibrating feeder to 0Hz to maintain the height of the material in the furnace, so that the hot melt blocks remain in the area of ​​the cold air branch pipe.

[0016] 2. At the location where the hot melt block stops, make horizontally spaced square holes on the outside of the main cold air duct (700mm diameter) corresponding to the branch cold air duct (DN200mm diameter) at the same horizontal position. Starting from the first hole, make one hole every other cold air duct. The hole diameter is 100mm (±20mm). This hole size can accommodate steel pipes with a diameter of DN50mm and below. It ensures that the steel pipe can swing slightly upward, downward, left, and right within the cold air branch duct without restriction, and can be fixed in position more stably. It also ensures that after use, it is easier and faster to install a switchable sealing door, effectively preventing air leakage at the door during normal production.

[0017] 3. Based on the actual distance of the cooling water intake point on site, prepare a certain length of flexible hose. Connect one end of the flexible hose to the cooling water and the other end to the steel pipe. The length of the steel pipe can generally be determined to be about 2.5 meters, so as to ensure that it can pass through the main cold air pipe, the branch cold air pipe and the furnace wall, and can reach the center of the hot melt block. Insert the steel pipe along the opening on the outside of the main cold air pipe, through the branch cold air pipe and into the position where the hot melt block stops in the furnace, so that it is in direct contact with the upper and side surfaces of the hot melt block.

[0018] 4. Open the cooling water valve. Cold water enters the furnace through the pre-connected hose and steel pipe to force cooling of the upper and side surfaces of the hot melt block.

[0019] 5. Observe the cooling of the hot melt block from above the furnace door. Stop spraying water when the area affected by the forced cooling point of the hot melt block changes from red to black. Move the cooling water pipe to the next position and continue forced cooling. Repeat this process of changing positions until the entire surface of the hot melt block or the surface of the melt block that has naturally cracked after cooling changes from red to black. Then stop forced cooling and seal the opening in the main cold air pipe.

[0020] 6. Start the furnace material crushing toothed rollers at the bottom of the furnace and continuously adjust the working frequency of the frequency converter of the vibrating feeder to continue the furnace discharge operation. After all the cooled hot melt blocks are located on the upper part of the toothed rollers, adjust the rotation direction of the two adjacent toothed rollers in a timely manner according to the discharge volume during the rotation of the toothed rollers and the actual situation, so that the rotation direction of each toothed roller is opposite to the rotation direction of the adjacent toothed rollers on both sides, forming an operating state in which internal meshing (the function of crushing the melt blocks) and external meshing (the function of moving the melt blocks) coexist. The naturally cracked hot melt blocks after cooling are further crushed and discharged from the furnace.

[0021] The above description is merely a preferred embodiment of the present invention. These specific embodiments are different implementations based on the overall concept of the present invention, and the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for rapidly processing agglomerates inside a vertical shaft furnace, characterized in that, The specific steps of the method for rapidly processing agglomerates inside a vertical shaft furnace are as follows: Step 1: When signs of agglomeration are found in the vertical furnace, first discharge the material in the furnace, then observe the material discharge situation in the furnace. After the hot melt block is discharged with the material in the furnace to the corresponding area of ​​the cold air branch pipe (2) of the cold air duct, stop the discharge operation. Step 2: Make a square hole at the position corresponding to the cold air branch pipe (2) on the outside of the main cold air pipe (1) and install a sealable door that can be opened and closed at the hole; Step 3: Connect one end of the soft rubber hose to the cooling water and the other end of the soft rubber hose to one end of the steel pipe (3); pass the other end of the steel pipe (3) perpendicular to the opening on the outside of the main cold air pipe (1), and then continue to insert it into the furnace in a horizontal direction parallel to the cold air branch pipe (2) until the hot melt block stops and comes into contact with the hot melt block; Step 4: Open the cooling water valve. Cold water enters the furnace through the connected soft rubber hose and steel pipe (3) to force the hot melt block to cool down. Step 5: Observe the cooling of the hot melt block through the furnace door. Stop spraying water when the color of the hot melt block forced cooling point changes from red to black, and move the steel pipe (3) to the next position to continue forced cooling. Repeat this process of changing positions until the color of the entire hot melt block changes from red to black, then stop forced cooling and seal the opening on the outside of the cold air main pipe (1). Step Six: Start the furnace material crushing toothed roller at the bottom of the furnace and continuously adjust the working frequency of the frequency converter of the vibrating feeder. Continue the material discharge operation in the furnace. After all the cooled hot melt blocks are located on the upper part of the toothed roller, adjust the toothed roller to form the internal meshing and external meshing operation state at the same time. Further crush the hot melt blocks that have naturally cracked after cooling and discharge them into the furnace.

2. The method for rapidly processing agglomerates inside a vertical shaft furnace according to claim 1, characterized in that, The diameter of the cold air branch pipe (2) is DN200mm, the diameter of the cold air main pipe (1) is DN700mm, the diameter of the opening is 100mm±20mm, and the diameter of the steel pipe (3) is DN50mm.

3. The method for rapidly processing agglomerates inside a vertical shaft furnace according to claim 1, characterized in that, The length of the steel pipe (3) is greater than the sum of the lengths of the main cold air pipe (1), the branch cold air pipe (2), and the furnace wall.

4. The method for rapidly processing agglomerates inside a vertical shaft furnace according to claim 1, characterized in that, The simultaneous operation of internal and external meshing is achieved by adjusting the rotation direction of two adjacent toothed rollers so that the rotation direction of each toothed roller is opposite to that of the adjacent toothed rollers on both sides.

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