Search

CN-122012829-A - Double oxygen lance furnace opening technology suitable for rapid recovery production of blast furnace

CN122012829ACN 122012829 ACN122012829 ACN 122012829ACN-122012829-A

Abstract

The application provides a double oxygen lance blow-in technology suitable for rapid recovery production of a blast furnace, and belongs to the field of blast furnace ironmaking. The technology comprises (1) adopting a specific open furnace ore preparation and charging system and (2) adopting a visual intelligent double oxygen lance device to preheat and melt the iron notch area. According to the application, by combining macroscopic charging heat system design with microscopic local iron notch heating channel technology, precise cooperation is formed in time and space, so that the normal smelting state of the blast furnace is efficiently reconstructed on the premise of ensuring safety. The technology can lead the blast furnace to be rapidly and repeatedly produced, and the normal production state is achieved within 24 hours, the original 72 hours is shortened to 24 hours, the furnace opening and the subsequent production cost are greatly reduced, the labor intensity of workers is reduced, the safety and smoothness of the first furnace iron of the blast furnace are ensured, and the safe furnace opening is realized through the skimming tool.

Inventors

  • WANG CHAOFEI
  • WANG JINLONG
  • HAN TING
  • ZHANG JIHANG
  • SUI NING
  • CHEN XIAOPING

Assignees

  • 盐城市联鑫钢铁有限公司

Dates

Publication Date
20260512
Application Date
20260303

Claims (10)

  1. 1. The double oxygen lance furnace opening technology suitable for the rapid recovery production of the blast furnace is characterized by comprising the following steps of: (1) The specific open-hearth ore-preparation and charging system is adopted, namely, the total coke ratio of the whole furnace is 2700kg/t, the target components of pig iron are set to be [ Si 3%, [ Mn ]1.2%, [ Fe ]93%, and a hearth wood-filling method is adopted in the charging process, specifically, 2/3 parts of the dead iron layer, the hearth and the hearth height of the blast furnace are filled with clean coke, the rest 1/3 of the hearth, the waist and the lower 3m area of the furnace body are filled with empty coke, the lower 3m area of the furnace body is filled with sectional load materials, and the load values of the sectional load materials are sequentially 2.42, 2.62 and 2.96; (2) Preheating and melting a tap hole area by adopting a visual intelligent double-oxygen-gun device, namely sending the visual intelligent double-oxygen-gun device into a tap hole channel of a blast furnace, controlling the visual intelligent double-oxygen-gun device to continuously supply oxygen for at least 8 hours under the condition that the oxygen supply pressure is not lower than 0.6MPa, simultaneously monitoring the combustion state of the furnace in real time by a camera built in the visual intelligent double-oxygen-gun device, monitoring the temperature of a hearth refractory material position by a thermocouple of the visual intelligent double-oxygen-gun device, and immediately cutting off the oxygen supply of the visual intelligent double-oxygen-gun device when the thermocouple temperature is sharply increased to be more than or equal to 600 ℃.
  2. 2. The double oxygen lance blow-in technique suitable for blast furnace rapid recovery production according to claim 1, wherein the charging regime is specifically: a) Charging clean coke in the area with 2/3 of the height of the dead iron layer, the hearth and the hearth, wherein the total weight is 235t, the coke is charged in 23.5 batches, and the corresponding furnace burden volume is 360.89m 3 ; b) Filling empty coke in the regions of the rest 1/3 of the furnace belly, the furnace waist and the lower part of the furnace body by 3m, wherein the total weight is 246t, the empty coke is filled in 20 batches, and the corresponding furnace burden volume is 331.83m 3 ; c) Filling normal load materials in a region above 3m at the lower part of the furnace body, wherein the total weight is 508.75t, the normal load materials are filled in 23 batches, and the corresponding furnace material volume is 381.77m 3 ; The total charge amount of the whole furnace is 956.3t, the total batch number is 66.5 batch, and the total charge volume is 1074.49m 3 .
  3. 3. The dual lance blow-in technique for rapid recovery production of blast furnaces according to claim 1, wherein the batch reconstitution of various charges is: clean coke, the coke batch weight is 10000kg, and no ore is added; Empty coke, wherein the coke batch weight is 10000kg, 500kg of manganese ore and 1800kg of dolomite are added; the load value is 2.42, the coke batch weight is 6500kg, the ore batch weight is 15000kg, and the load value comprises 10800kg of sintered ore, 2250kg of pellet ore, 1950kg of lump ore, 550kg of manganese ore and 600kg of serpentine; the load value is 2.62, the coke batch weight is 6000kg, the ore batch weight is 15000kg, and the load value comprises 11250kg of sintered ore, 1800kg of pellet ore, 1950kg of lump ore, 550kg of manganese ore and 450kg of serpentine; the load value of the load material is 2.96, the coke batch weight is 5300kg, the ore batch weight is 15000kg, and the load material comprises 11250kg of sintered ore, 2100kg of pellet ore, 1650kg of lump ore, 550kg of manganese ore and 400kg of serpentine.
  4. 4. The dual lance firing technique for blast furnace fast recovery production of claim 3 wherein the coke ratio of the load material is 662kg/t, the binary basicity R 2 of the load material is 1.19, the basicity of the empty coke is 0.90, and the total compression ratio of the whole furnace charge is 14%.
  5. 5. A visual intelligent twin lance apparatus for use in a lance furnace assembly according to any one of claims 1 to 4, comprising: The oxygen lance comprises an oxygen lance main body, wherein the oxygen lance main body is composed of an inner pipe (7) and an outer pipe (4) which are coaxially arranged, the inner pipe (7) and the outer pipe (4) are welded and fixed through a connecting pipe (6), and an annular separation cavity is formed between the inner pipe and the outer pipe; the inner tube (7) forms an oxygen channel, and the tail end of the inner tube is connected with at least one oxygen inlet; The annular separation cavity forms a compressed air channel, and the tail end of the annular separation cavity is connected with a compressed air inlet; The tail end of the oxygen lance main body is coaxially connected with a drill shank (1) which is matched with the tapping machine clamping mechanism; An alloy drill bit (10) is arranged at the front end of the oxygen lance main body, and an injection hole communicated with the inner pipe (7) and the annular separation cavity is formed in the alloy drill bit (10); The temperature measuring assembly comprises a thermocouple arranged at the rear end of the upper cavity of the oxygen lance body and is used for monitoring the temperature of the hearth refractory material position; The visualization assembly comprises an endoscopic camera arranged in the oxygen channel of the inner tube (7), and the camera is positioned in front of the thermocouple and used for observing the combustion state in the furnace in real time.
  6. 6. The visual intelligent twin oxygen lance apparatus defined in claim 5 wherein the oxygen inlet and the compressed air inlet are located on the same cross section of the aft end of the lance body.
  7. 7. The visual intelligent double-oxygen-gun device according to claim 5 or 6, wherein the number of the oxygen inlets is two, and the pipeline direction of one of the oxygen inlets is obliquely downwards arranged at 45 degrees and is used as a slag iron discharge channel after cutting off oxygen.
  8. 8. The visual intelligent double-oxygen-gun device according to claim 5, wherein the drill shank (1) is a T38-shaped drill shank.
  9. 9. The visual intelligent double-oxygen-gun device according to claim 5, wherein the endoscopic camera is an 8mm hard wire three-in-one high-definition camera and is in wireless connection with an external display terminal through a built-in WiFi module.
  10. 10. The visual intelligent double-oxygen-gun device according to claim 5 is characterized in that the temperature measuring range of the thermocouple is 0-1350 ℃, the insertion depth is larger than the thickness of hearth refractory, and the camera probe is positioned at the position 100mm in front of the thermocouple.

Description

Double oxygen lance furnace opening technology suitable for rapid recovery production of blast furnace Technical Field The application relates to the technical field of blast furnace ironmaking, in particular to a double oxygen lance blow-in technology suitable for rapid recovery production of a blast furnace. Background In the iron-making production process, a blast furnace is a core device for smelting iron from iron ores, cokes, fluxes and other furnace materials through a high-temperature chemical reaction. In production practice, blast furnaces often need to be subjected to a damping down for days or even longer for reasons of planned overhauls, malfunctions or production scheduling. During this process, the temperature in the furnace gradually decreases and the melted iron slag may resolidify, especially in the hearth and tap hole areas, with localized freezing. When the blast furnace needs to be restored to production, the conventional method of opening the furnace generally relies on filling part of firewood or coke in the hearth and gradually heating the entire hearth by means of hot air fed from the tuyere, so that the frozen iron slag is slowly melted and finally flows out from the taphole. The process is long in time consumption, the normal production level can be gradually changed over by more than 72 hours, the stability of the furnace condition is poor in the long-time heating process, the problems of suspended materials, difficulty and the like are easy to occur, and meanwhile, the front worker needs to repeatedly try tapping, so that the labor intensity is high and the safety risk is high. Macroscopic charging system (such as coke ratio setting and sectional charging) can provide total heat reserve for the upper part of the furnace body, but is severely disjointed with the key local physical dredging and rapid heating process of a hearth tap hole. The two cannot form effective synergy, so that macroscopic heat cannot be efficiently conducted to a tap hole area needing melting, and solidification blockage of the tap hole area can prevent recovery of the whole smelting process. Therefore, how to effectively cooperate the overall design of the macroscopic furnace charging heat system with the accurate and rapid dredging of the microscopic taphole heating channel, and greatly shorten the time from ignition air supply to qualified molten iron production and normal production recovery on the premise of ensuring the safety of hearth refractory materials, has become a core technical problem to be solved in rapid and safe recovery production of a blast furnace. Disclosure of Invention The application provides a double oxygen lance open-hearth technology suitable for rapid recovery production of a blast furnace, which is used for precisely cooperating a macroscopic charging heat system and a microscopic local iron notch heating channel required by recovery production of the blast furnace, and greatly shortening the time from ignition air supply to recovery of normal production on the premise of ensuring the safety of a blast furnace body. In a first aspect, the application provides a double oxygen lance blow-in technique suitable for rapid recovery production of a blast furnace, comprising the following steps: (1) The specific open-hearth ore-preparation and charging system is adopted, namely, the total coke ratio of the whole furnace is 2700kg/t, the target components of pig iron are set to be [ Si 3%, [ Mn ]1.2%, [ Fe ]93%, and a hearth wood-filling method is adopted in the charging process, specifically, 2/3 parts of the dead iron layer, the hearth and the hearth height of the blast furnace are filled with clean coke, the rest 1/3 of the hearth, the waist and the lower 3m area of the furnace body are filled with empty coke, the lower 3m area of the furnace body is filled with sectional load materials, and the load values of the sectional load materials are sequentially 2.42, 2.62 and 2.96; (2) Preheating and melting a tap hole area by adopting a visual intelligent double-oxygen-gun device, namely sending the visual intelligent double-oxygen-gun device into a tap hole channel of a blast furnace, controlling the visual intelligent double-oxygen-gun device to continuously supply oxygen for at least 8 hours under the condition that the oxygen supply pressure is not lower than 0.6MPa, simultaneously monitoring the combustion state of the furnace in real time by a camera built in the visual intelligent double-oxygen-gun device, monitoring the temperature of a hearth refractory material position by a thermocouple of the visual intelligent double-oxygen-gun device, and immediately cutting off the oxygen supply of the visual intelligent double-oxygen-gun device when the thermocouple temperature is sharply increased to be more than or equal to 600 ℃. Optionally, the charging system specifically comprises: a) Charging clean coke in the area with 2/3 of the height of the dead iron layer, the hearth and the he