Blast furnace tuyere blocking process

Abstract

The blast furnace tuyere plugging process comprises the following steps: firstly, preparing mixed stemming by mixing water stemming with dry pulverized coal; twisting the mixed stemming into a cylinder; and finally, the stemming is fed into a tuyere small sleeve of the blast furnace and tightly pressed, and tuyere plugging is completed. The mixed stemming is prepared by mixing the following components in parts by mass: 5-10 parts of water stemming and 0.1 part of dry pulverized coal. The mixed stemming prepared by mixing dry pulverized coal is adopted, and the pulverized coal can absorb moisture in the stemming, so that the stemming is firmer, the blocked tuyere is not easy to blow open in a short time, and the purpose of recovering the furnace condition after the tuyere is blocked is achieved; after reblowing, oxygen in blast can burn and gasify pulverized coal, the pulverized coal can be automatically blown open after the tuyere is blocked for about 3-5 hours, and potential safety hazards caused by tuyere poking are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a blast furnace tuyere blocking process. Background Art

[0002] After a blast furnace has been out of service for a long time, in order to ensure smooth furnace conditions after the blast, one or several tuyere openings need to be blocked for production 3-5 hours after the blast. Generally, water cannon mud is used to directly block the tuyere to reduce the air supply area and increase the kinetic energy of the blast. After the furnace condition is normal, the blocked tuyere needs to be poked open to resume normal production. The prior art uses water cannon mud to directly block the tuyere, which has the following shortcomings: 1) If there is not enough blocking mud, the tuyere is easy to blow open and the effect of blocking the tuyere cannot be achieved; if there is too much blocking mud, it is easy to make it difficult to open the tuyere later, and sometimes the tuyere cannot be opened; 2) When the tuyere is opened, it needs to be manually poked at high temperature and high pressure, and the tuyere needs to be opened for a long time. In most cases, the tuyere needs to be opened multiple times, which poses a safety hazard and is easy to hurt people.

[0003] For example, patent CN108842018A discloses a blast furnace tuyere plugging device and its installation and removal method, wherein the plugging device has a refractory material, and the refractory material is a low-cement refractory castable, and its component ratio is: Al2O3 60-70 parts, CaO 1.5-2.5 parts, SiO2 25-30 parts, 425R Portland cement 3-6 parts; the water cannon mud plugging takes a long time and is difficult to remove later; for example, patent CN221071553U discloses a blast furnace ventilation tuyere plugging device, comprising a drill bit, a steel chisel, a handle and a striking head, a steel chisel is provided at one end of the drill bit, a handle is provided at the other end of the steel chisel, and a striking head is provided at the other end of the handle; in the existing process, manual removal is required, and in most cases, the tuyere needs to be bucketed multiple times, which poses a safety hazard. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a blast furnace tuyere blocking process, wherein the tuyere blocking process can be automatically blown open in a later stage, thereby avoiding the potential safety hazards caused by the tuyere being poked.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The blast furnace tuyere blocking process comprises the following steps:

[0007] First, mix water taphole mud with dry coal powder to make mixed taphole mud;

[0008] Then roll the mixed cannon mud into a cylinder;

[0009] Finally, the cannon mud is sent into the small sleeve of the tuyere of the blast furnace and pressed tightly to complete the blocking of the tuyere.

[0010] Further:

[0011] The mixed taphole mud is mixed according to the following mass parts: 5-10 parts of water taphole mud and 0.1 parts of dry coal powder.

[0012] Before the taphole mud is fed into the tuyere sleeve of the blast furnace, the front edge of the tuyere sleeve is repeatedly poked open to see the red coke, and all the coke and other debris are pushed into the furnace in front of the tuyere to ensure that there is a gap at the front edge of the tuyere.

[0013] The plugging amount of the mixed taphole mud is to reach 1 / 2-2 / 3 of the depth of the tuyere small sleeve.

[0014] Before blocking the tuyere, the debris in the tuyere pipe is cleaned, and then the mud and slag in the tuyere are repeatedly poked open to ensure that the red coke can be seen from the tuyere.

[0015] After the mixed taphole mud is rolled into a cylinder, the cylindrical mixed taphole mud is sent into the small air inlet sleeve in sections, and each section of the mixed taphole mud is compacted with a plugging shovel.

[0016] During the process of sending the mixed cannon mud in stages, the first lump of blocking mud must be blocked in the furnace in front of the small sleeve of the air inlet. If the gap in front is large, more blocking mud is needed, and it is ensured that the blocking mud can be compacted and the edge of the blocking mud needs to be compacted.

[0017] During the process of delivering the mixed taphole mud in sections, each time after the taphole mud is tightly blocked with a blocking shovel, the blocking shovel should be rotated and then pushed out to prevent the sticky taphole mud from being loosened.

[0018] Before plugging, stick some dry ash and then mix with the cannon mud.

[0019] After the air outlet is blocked, use a flashlight to check the blocking surface of the air outlet small sleeve. The blocking surface forms a regular circle to prevent the edge from becoming loose.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The blast furnace tuyere blocking process is reasonably designed, and adopts mixed cannon mud made of dry coal powder. The coal powder will absorb the moisture in the blocking mud, making the blocking mud stronger, and the blocked tuyere is not easy to blow open in a short time, so as to achieve the purpose of restoring the furnace condition by blocking the tuyere; after the air is restored, the oxygen in the blast will make the coal powder burn and gasify, and the blocked tuyere can be automatically blown open in about 3-5 hours, avoiding the safety hazards caused by poking the tuyere. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents and symbols in the drawings of this specification:

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] In the figure:

[0025] 1. Small air inlet sleeve, 2. Mud plugging, 3. Coke. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the blast furnace tuyere blocking process comprises the following steps:

[0028] 1) Firstly, mix water taphole mud with dry coal powder to make mixed taphole mud;

[0029] 2) Roll the mixed taphole mud into a cylinder;

[0030] 3) Finally, the taphole mud is sent into the tuyere sleeve 1 of the blast furnace and pressed tightly to complete the tuyere blocking.

[0031] in,

[0032] The mixed taphole mud is mixed in the following mass proportions: 5-10 parts of water taphole mud and 0.1 parts of dry coal powder. The present invention uses the mixed taphole mud mixed with dry coal powder. The coal powder will absorb the moisture in the plugging mud, making the plugging mud 2 more solid. The blocked tuyere is not easy to blow open in a short time, so as to achieve the purpose of restoring the furnace condition by blocking the tuyere; after the air is restored, the oxygen in the blast will cause the coal powder to burn and gasify, and the blocked tuyere can be automatically blown open in about 3-5 hours, avoiding the safety hazards caused by poking the tuyere.

[0033] Before blocking the tuyere, clean the debris in the tuyere pipe, and then repeatedly poke open the mud and slag in the tuyere to ensure that the red coke can be seen from the tuyere 3. Specifically, before the tapping mud is sent into the tuyere sleeve of the blast furnace, the front edge of the tuyere sleeve is repeatedly poked open to see the red coke, and all the coke and other debris are pushed into the furnace in front of the tuyere to ensure that there is a gap at the front edge of the tuyere to facilitate the compaction of the mud blocking edge.

[0034] Roll the water-containing cannon mud into a cylindrical shape with a diameter of 6cm and a length of 15cm; use a plugging shovel to send the cannon mud into the small air vent sleeve and press it tightly; the amount of mixed cannon mud should reach 1 / 2-2 / 3 of the depth of the small air vent sleeve to facilitate automatic opening later.

[0035] Furthermore, after the mixed cannon mud is rolled into a cylinder, the cylindrical mixed cannon mud is sent into the small air inlet sleeve in sections, and each section of the mixed cannon mud is compacted with a plugging shovel.

[0036] During the process of sending in the mixed cannon mud in stages, the first lump of blocking mud must be blocked in the furnace in front of the small sleeve of the air inlet. If the gap in front is large, more blocking mud is needed, and it is ensured that the blocking mud can be compacted and the edges of the blocking mud need to be compacted.

[0037] Each time after using a blocking shovel to tightly plug the cannon mud, the blocking shovel should be turned down and then pushed out to prevent the sticky cannon mud from being loosened; or you can apply some dry ash before plugging the cannon mud with the blocking shovel.

[0038] After completing the blocking of the air outlet, use a flashlight to check the blocking surface of the small sleeve of the air outlet. The blocking surface forms a regular circle to prevent the edges from becoming loose.

[0039] The process principle of the present invention is described as follows: taphole mud is sent into the small sleeve of the tuyere to prevent slag and iron from sticking to the small sleeve after re-airing, causing the tuyere to be unable to be opened; some coal powder is added to the taphole mud, and the coal powder will absorb moisture in the blocking mud, making the blocking mud stronger and not easy to blow open the tuyere; after re-airing, the oxygen in the blast will cause the coal powder to burn and gasify, making the blocking mud gradually become loose, and after a certain period of time, the tuyere will automatically blow open, avoiding manual poking of the tuyere (even if it is not blown open in a short time, it is easier to manually poke the tuyere).

[0040] Preferred embodiments of the present invention are:

[0041] The specific steps of blast furnace tuyere blocking process are:

[0042] 1. Before re-airing, take 5 to 10 kg of water-containing cannon mud according to the time required to block the air outlet. The cannon mud must not be too thin and must have a certain dryness (the water content of the cannon mud is about 12%). Move the cannon mud to the air outlet that needs to be blocked. If the cannon mud is too wet, it needs to be dried before use.

[0043] 2. According to the amount of cannon mud, take about 0.1 kg of dry coal powder, mix the cannon mud and coal powder thoroughly, and after mixing, make the cannon mud into several sections with a diameter of 6 cm and a length of 15 cm.

[0044] 3. Open the large cover of the tuyere (the tuyere needs to be backflowed at this time to avoid hot air hurting people), clean the debris in the tuyere blowpipe, and then repeatedly poke open the mud and slag in the tuyere to ensure that the red coke can be seen from the tuyere; and push all the coke and other debris in the tuyere small sleeve into the furnace in front of the tuyere small sleeve, and make sure there is a certain gap at the front of the tuyere small sleeve.

[0045] 4. Send the prepared cylindrical cannon mud mixed with coal powder into the air inlet sleeve in sections. Each section of cannon mud must be compacted with a plugging shovel. The first lump of blocking mud must be blocked in the furnace in front of the air inlet sleeve. If the gap in front is large, more blocking mud is needed, and make sure that the blocked mud can be compacted, especially the edge of the blocking mud needs to be compacted (because the blocking mud will dry out after the air is supplied, and gaps will easily appear at the edge, causing the air inlet to be blown open prematurely). It is best to tighten the first few lumps of blocking mud with a hammer. After each time the cannon mud is tightly blocked with a plugging shovel, the plugging shovel should be rotated and then pushed out to prevent the sticky cannon mud from being loosened. You can also stick some dry ash on the plugging shovel before blocking the cannon mud.

[0046] 5. According to the time required to block the air outlet, select the amount of mud blocking to reach 1 / 2 or 2 / 3 of the depth of the air outlet small sleeve.

[0047] 6. Use a flashlight to check the surface of the mud plugging on the air vent sleeve. The surface of the mud plugging should form a regular circle, especially to prevent the edges from becoming loose.

[0048] 7. Put on the big cover to complete the blocking of the air vent, and inform the water worker not to touch the blocking mud when inserting the spray gun to avoid the formation of voids and cause the failure of blocking the air vent.

[0049] The above is only an explanation of the preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0050] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A blast furnace tuyere blocking process, characterized in that: The following steps are involved: First, mix water taphole mud with dry coal powder to make mixed taphole mud; Then roll the mixed cannon mud into a cylinder; Finally, the cannon mud is sent into the small sleeve of the tuyere of the blast furnace and pressed tightly to complete the blocking of the tuyere.

2. The blast furnace tuyere blocking process according to claim 1, characterized in that: The mixed taphole mud is mixed according to the following mass parts: 5-10 parts of water taphole mud and 0.1 parts of dry coal powder.

3. The blast furnace tuyere blocking process according to claim 1, characterized in that: Before the taphole mud is fed into the tuyere sleeve of the blast furnace, the front edge of the tuyere sleeve is repeatedly poked open to see the red coke, and all the coke and other debris are pushed into the furnace in front of the tuyere to ensure that there is a gap at the front edge of the tuyere.

4. The blast furnace tuyere blocking process according to claim 1, characterized in that: The plugging amount of the mixed taphole mud is to reach 1 / 2-2 / 3 of the depth of the tuyere small sleeve.

5. The blast furnace tuyere blocking process according to claim 1, characterized in that: Before blocking the tuyere, the debris in the tuyere pipe is cleaned, and then the mud and slag in the tuyere are repeatedly poked open to ensure that the red coke can be seen from the tuyere.

6. The blast furnace tuyere blocking process according to claim 1, characterized in that: After the mixed taphole mud is rolled into a cylinder, the cylindrical mixed taphole mud is sent into the small air inlet sleeve in sections, and each section of the mixed taphole mud is compacted with a plugging shovel.

7. The blast furnace tuyere blocking process according to claim 6, characterized in that: During the process of sending the mixed cannon mud in stages, the first lump of blocking mud must be blocked in the furnace in front of the small sleeve of the air inlet. If the gap in front is large, more blocking mud is needed, and it is ensured that the blocking mud can be compacted and the edge of the blocking mud needs to be compacted.

8. The blast furnace tuyere blocking process according to claim 7, characterized in that: During the process of delivering the mixed taphole mud in sections, each time after the taphole mud is tightly blocked with a blocking shovel, the blocking shovel should be rotated and then pushed out to prevent the sticky taphole mud from being loosened.

9. The blast furnace tuyere blocking process according to claim 8, characterized in that: Before plugging, stick some dry ash and then mix with the cannon mud.

10. The blast furnace tuyere blocking process according to claim 9, characterized in that: After the air outlet is blocked, use a flashlight to check the blocking surface of the air outlet small sleeve. The blocking surface forms a regular circle to prevent the edge from becoming loose.

Images