Search

CN-115851287-B - Nitrogen-oxygen composite rare earth ceramic riser base and preparation process thereof

CN115851287BCN 115851287 BCN115851287 BCN 115851287BCN-115851287-B

Abstract

The invention discloses a nitrogen-oxygen composite rare earth ceramic ascending pipe base and a preparation process thereof, and relates to the technical field of coke oven ascending pipes, wherein the ascending pipe base comprises a base and an ascending pipe barrel, the ascending pipe barrel is fixedly arranged at the upper part of the base, and the sections of the ascending pipe barrel and the base are circular and concentrically arranged; the base comprises, by weight, 40-50 parts of silicon carbide powder, 12-13 parts of industrial silicon powder, 8-10 parts of silicon powder, 2-3 parts of additives and 33-36 parts of binders, and a coke cleaning assembly for cleaning graphite and tar attached to the inner wall of the base is arranged in the base. The preparation process comprises the following steps of S1, mixing, S2, forming, S3, sintering, S4 and mounting. The invention selects high-purity silicon carbide as the main raw material, ensures excellent thermal shock stability of the product, and adds rare earth oxide to improve the toughness of the riser base material, thereby further improving the wear resistance and oxidation resistance of the riser base.

Inventors

  • JIANG YUQING
  • JIANG TIAN

Assignees

  • 宜兴市钰玺窑业有限公司

Dates

Publication Date
20260508
Application Date
20221221

Claims (8)

  1. 1. The nitrogen-oxygen composite rare earth ceramic ascending tube base is characterized by comprising a base (1) and an ascending tube body (2), wherein the ascending tube body (2) is fixedly arranged at the upper part of the base (1), and the cross sections of the ascending tube body (2) and the base (1) are circular and concentrically arranged; The base (1) comprises 40-50 parts by weight of silicon carbide powder, 12-13 parts by weight of industrial silicon powder, 8-10 parts by weight of silicon powder, 2-3 parts by weight of additive and 33-36 parts by weight of bonding agent; the coke cleaning device is characterized in that a coke cleaning component for cleaning graphite and tar attached to the inner wall of the base (1) is arranged inside the base (1), the coke cleaning component comprises a first fixing rod (3), a second fixing rod (4), a rotating shaft group (5) and a coke cleaning rod (6), the first fixing rod (3) and the second fixing rod (4) are fixedly arranged on one side of the inner wall of the riser tube body (2) and penetrate through the other side of the riser tube body (2), the first fixing rod (3) is located right above the second fixing rod (4), the first fixing rod (3) and the second fixing rod (4) are all in hollow arrangement, a first groove (31) is formed in the first fixing rod (3), and a second groove (41) is formed in the second fixing rod (4); The rotating shaft group (5) is positioned at the center of the base (1), the rotating shaft group (5) comprises an upper rotating shaft (51) and a lower rotating shaft (52) which are arranged by a sliding connecting sleeve, the upper rotating shaft (51) penetrates through the middle part of the second fixing rod (4) and extends to the bottom of the first fixing rod (3), a belt pulley group (7) is arranged in the second groove (41) of the second fixing rod (4), the belt pulley group (7) comprises a first belt pulley (71) and a second belt pulley (72) which synchronously rotate, the upper rotating shaft (51) is clamped with the center of the second belt pulley (72) and synchronously rotates with the second belt pulley (72), the first belt pulley (71) is driven to rotate by a belt pulley motor (73) positioned below the second fixing rod (4), a steel wire rope (53) for pulling the steel wire rope (53) to slide up and down along the inside the upper rotating shaft (51) is arranged at the top end of the lower rotating shaft (52), the steel wire rope (53) penetrates through the bottom of the first fixing rod (3) and the first groove (31) to be connected with the first drum (33) for rotating at the tail end of the first drum (32), the servo motor (33) and the belt pulley motor (73) are fixedly arranged side by side; Decoking pole (6) are a plurality of and equidistant setting in circumference pivot (52) bottom down, and decoking pole (6) bottom is equipped with fluting (61), fluting (61) top is equipped with spout (62) that are used for holding spring (63), spring (63) one end with spout (62) inboard fixed connection, spring (63) other end are fixed to be equipped with slider (64), slider (64) bottom is equipped with first rotary rod (65) rather than rotating connection, first rotary rod (65) bottom fixedly connected with connecting rod (66), connecting rod (66) both ends bottom all is equipped with second rotary rod (67) rather than rotating connection, second rotary rod (67) bottom fixedly connected with decoking board (68).
  2. 2. The nitrogen-oxygen composite rare earth ceramic riser tube base of claim 1, wherein the silicon carbide powder comprises 0.2-0.3% by mass of Fe 2 O 3 and the balance of SiC, the industrial silicon powder comprises 0.5-0.55% by mass of Fe, 0.2-0.4% by mass of Al, 0.01-0.02% by mass of Ca and the balance of Si, and the silicon micropowder comprises 96-99% by mass of SiO 2 .
  3. 3. The nitrogen-oxygen composite rare earth ceramic riser tube base of claim 1, wherein the additive is one or more of rare earth oxides La 2 O 3 、Nd 2 O 3 、CeO 2 , and the binder is a CMC solution with a mass concentration of 40%.
  4. 4. The nitrogen-oxygen composite rare earth ceramic ascending pipe base according to claim 1, wherein limiting grooves (54) are formed in two sides of the inner wall of the upper rotating shaft (51), the limiting grooves (54) are slidably connected with limiting protrusions (55) formed in the outer wall of the lower rotating shaft (52) and are used for completing sliding and synchronous rotation of the upper rotating shaft (51) and the lower rotating shaft (52), limiting clamping grooves (8) used for vertically fixing the second belt pulley (72) are formed in two sides, corresponding to the second belt pulley (72), of the second fixing rod (4), and a row of pulleys (81) are arranged in the inner bottom of the limiting clamping grooves (8) and used for supporting the surface of the second belt pulley (72).
  5. 5. The nitrogen-oxygen composite rare earth ceramic riser tube base according to claim 1, wherein the number of the coke cleaning rods (6) is 3, the coke cleaning plates (68) are arranged in a triangular sheet shape, each corner of each coke cleaning plate (68) is provided with an arc scraping plate (69), one side of the tail end of each first fixing rod (3) is provided with an air guide tube (34), the air guide tube (34) is connected with an air pump (35) arranged outside, the air guide tube (34) is communicated with the inside of each first groove (31), a rotating groove (36) used for rotating and being in sealing connection with the upper rotating shaft (51) is arranged at the bottom of each first fixing rod (3), an opening (56) used for air inlet is formed in the top of each lower rotating shaft (52), the opening (56) extends to the bottom of each lower rotating shaft (52) and is communicated with an air outlet hole (9) formed in the bottom of each coke cleaning rod (6), and the tail end of each air outlet hole (9) extends out of the inner wall of each groove (61).
  6. 6. The process for preparing the nitrogen-oxygen composite rare earth ceramic riser tube base according to any one of claims 1 to 5, which is characterized by comprising the following steps: s1, mixing materials, namely weighing silicon carbide powder, industrial silicon powder and silicon micropowder according to the weight parts, grinding the silicon carbide powder, the industrial silicon powder and the silicon micropowder for standby, putting the silicon carbide powder and a bonding agent into a mixing mill, mixing for 10-15 min, then adding the industrial silicon powder, the silicon micropowder and an additive, continuously mixing for 15-20 min, discharging, and carrying out remixing for 36h to obtain a mixture; S2, molding, namely putting the mixture prepared in the step S1 into a vibration press for molding for 9-10 hours, naturally drying for 24 hours after demolding, and then drying for 48 hours at 200 ℃ to obtain a prefabricated brick; S3, sintering, namely placing the prefabricated brick prepared in the step S2 into a sintering furnace for sintering, introducing N 2 during sintering to keep the pressure in the furnace at a slight positive pressure of 0.1MPa, firstly heating to 1000-1050 ℃ at a heating rate of 15-20 ℃ per minute, preserving heat for 36h, then heating to 1400-1420 ℃ at a heating rate of 4-6 ℃ per minute, and preserving heat for 36h to obtain a sintered base (1); S4, installing, namely installing the ascending tube barrel body (2) on the upper part of the base (1) manufactured in the step S3, and installing a decoking assembly in the base (1) to obtain the nitrogen-oxygen composite rare earth ceramic ascending tube base.
  7. 7. The process for preparing a nitrogen-oxygen composite rare earth ceramic riser tube according to claim 6, wherein the maximum particle size of silicon carbide powder, industrial silicon powder and silicon micropowder ground in step S1 is not more than 3.5mm.
  8. 8. The process for preparing a nitrogen-oxygen composite rare earth ceramic riser tube base according to claim 6, wherein the brick shape formed in the step S2 is 230mm long, 114mm wide and 65mm high.

Description

Nitrogen-oxygen composite rare earth ceramic riser base and preparation process thereof Technical Field The invention relates to the technical field of coke oven risers, in particular to a nitrogen-oxygen composite rare earth ceramic riser base and a preparation process thereof. Background The ascending pipe base of the coke oven is arranged at the bottom of the ascending pipe, the ascending pipe is a channel for connecting the coke oven and the gas collecting pipe, and the ascending pipe orifice arranged at the top of the coke oven is used for guiding out raw gas in the carbonization chamber. In the use process of the coke oven, tar steam in the produced raw coke oven is cooled or condensed and separated out, flows to the bottom along the rising pipe wall, when separated out liquid tar encounters a high-temperature environment in the pipe, the tar is subjected to pyrolysis and thermal polycondensation reaction to generate graphite, and the higher the temperature is, the more the deposition amount of the graphite in the rising pipe is, the most of the graphite is attached to the inner wall, especially the base, and the use of the rising pipe is affected. Therefore, the material of the riser tube base needs to be optimized to reduce the adhesion of graphite, and the optimum protection effect is achieved by matching with a proper decoking means. Patent CN113150802B discloses a coke oven on-line decoking riser and on-line decoking method thereof, comprising a coke oven body, a riser tube seat, a riser tube tee joint, an on-line decoking driving device, an interpolation butt joint section, a riser tube water seal cover, a riser tube inner heat collector, a decoking driving screw, a decoking device, a bracket, a tube seat decoking device and a coke oven mouth decoking device, wherein the riser tube seat is arranged at the furnace mouth part of the coke oven body, the riser tube is arranged on the riser tube seat, the riser tube tee joint is arranged at one side of the top of the riser tube, and the top of the riser tube is fixedly provided with the riser tube water seal cover. The invention provides an on-line coke cleaning device for a coke oven ascending pipe, wherein the key part of coking in the operation process of the coke oven is coking at the furnace mouth of the coke oven ascending pipe seat and coking at the root passage of the ascending pipe at the ascending pipe seat, so that the on-line coke cleaning of the coke oven ascending pipe is realized, and the problem of coking and coke hanging existing in the on-line coke cleaning device is solved. However, most of the structure of the device is positioned inside the riser, focusing is easy to occur in the structure, and the material and the structure of the base of the riser are not optimized. Disclosure of Invention The present invention provides for addressing the above-mentioned problems. The technical scheme of the invention is as follows: The nitrogen-oxygen composite rare earth ceramic ascending tube base comprises a base and an ascending tube barrel, wherein the ascending tube barrel is fixedly arranged on the upper part of the base, and the cross sections of the ascending tube barrel and the base are circular and concentrically arranged; The base comprises, by weight, 40-50 parts of silicon carbide powder, 12-13 parts of industrial silicon powder, 8-10 parts of silicon micropowder, 2-3 parts of additives and 33-36 parts of binding agents; the base is internally provided with a coke cleaning component for cleaning graphite and tar attached to the inner wall of the base. Further, the silicon carbide powder comprises 0.2-0.3% of Fe 2O3 and the balance of SiC by mass percent, the industrial silicon powder comprises 0.5-0.55% of Fe, 0.2-0.4% of Al, 0.01-0.02% of Ca and the balance of Si by mass percent, and the silicon powder comprises 96-99% of SiO 2 by mass percent. The method has the advantages that the excellent thermal shock stability of the riser base product is ensured by optimizing the composition of the base. Further, the additive is one or more of rare earth oxides La 2O3、Nd2O3、CeO2, and the bonding agent is CMC solution with the mass concentration of 40%. By adding rare earth oxide in the production process, the toughness of the riser base material is improved, and the wear resistance and oxidation resistance of the product are further improved. Further, the decoking assembly comprises a first fixing rod, a second fixing rod, a rotating shaft group and a decoking rod, wherein the first fixing rod and the second fixing rod are fixedly arranged on one side of the inner wall of the ascending pipe barrel body and penetrate through the other side of the ascending pipe barrel body, the first fixing rod is positioned right above the second fixing rod, the first fixing rod and the second fixing rod are both hollow, a first groove is formed in the first fixing rod, and a second groove is formed in the second fixing rod; The rotating shaft group is po