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CN-122015513-A - Full-automatic high-temperature slag dry method high-efficiency waste heat recovery equipment

CN122015513ACN 122015513 ACN122015513 ACN 122015513ACN-122015513-A

Abstract

The invention discloses full-automatic high-temperature slag dry-method efficient waste heat recovery equipment. The inner wall of the equipment drum is a water pipe wall 2, fin groups 1 are uniformly distributed on the water pipe wall 2, a water inlet and outlet main pipe 3 is arranged at the center of the drum, a feed end sealing cover 14 and a discharge end sealing cover 15 are respectively arranged at two ends of the drum, a feed hopper 10 is arranged on the feed end sealing cover 14, a discharge hopper 11 is arranged on the discharge end sealing cover 15, a feed hopper control valve 18 is arranged on the feed hopper 10, a discharge hopper control valve 19 is arranged on the discharge hopper 11, two ends of the water inlet and outlet main pipe 3 are respectively connected with a steam outlet connecting pipe 12 and a water inlet connecting pipe 17, a steam outlet pipe coupler 13 is arranged on the steam outlet connecting pipe 12, and a water inlet pipe coupler 16 is arranged on the water inlet connecting pipe 17. The invention realizes that the heat recovery efficiency is more than or equal to 85 percent, the steam pressure fluctuation is less than or equal to +/-0.05 MPa, and the service life of equipment is 8-10.

Inventors

  • ZHU JUNJIE
  • MAO LEI
  • FENG HAO
  • QIAN YICHEN
  • ZHANG FAYOU
  • LIANG ZIHENG

Assignees

  • 中钢集团天澄环保科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery equipment is of a rotary drum structure and is characterized in that a water pipe wall (2) is arranged on the inner wall of the rotary drum, fin groups (1) are uniformly distributed on the water pipe wall (2), a water inlet and outlet main pipe (3) is arranged at the center of the rotary drum, a chain transmission box (9) is connected with the outer wall of the rotary drum, the chain transmission box (9) is connected with a motor (8), a feed end sealing cover (14) and a discharge end sealing cover (15) are respectively arranged at the two ends of the rotary drum, a feed hopper (10) is arranged on the feed end sealing cover (14), a discharge hopper (11) is arranged on the discharge end sealing cover (15), a feed hopper control valve (18) is arranged on the feed hopper (11), discharge hopper control valves (19) are arranged on the feed hopper (11), two ends of the feed inlet main pipe (3) are respectively connected with a steam outlet connecting pipe (12) and a water inlet connecting pipe (17), a steam outlet pipe coupler (13) is arranged on the steam outlet connecting pipe (12), a water inlet pipe coupler (16) is arranged on the water inlet connecting pipe (17), the water inlet and outlet main pipe (3) is concentric with the water inlet section, the high-temperature slag flow and slag flow in the high-temperature slag flow direction, and the high-temperature slag flow direction is opposite to the high-temperature slag flow direction.
  2. 2. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 1 is characterized in that the water inlet and outlet main pipe (3) adopts a three-layer concentric circle design at a high temperature section, an inner low-temperature water inlet pipe (4) is arranged in the inner part, an air heat insulation layer (5) is arranged in the middle, and an outer high-temperature steam pipe (6) is arranged in the outer part.
  3. 3. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 1, wherein the water inlet and outlet main pipe (3) adopts a double-layer concentric circle design at a low-temperature section, an inner-layer low-temperature water inlet pipe (4) is arranged at the inner part, a low-temperature section water outlet high-temperature pipe (20) is arranged at the outer part, and a temperature self-adaptive valve is adopted for connecting the low-temperature Duan Chushui high-temperature pipe (20) with a plant heating pipe network.
  4. 4. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 1, wherein a circle of arc-shaped guide plates (7) are arranged on the outer wall of the water inlet and outlet main pipe (3), the bending direction of the arc-shaped guide plates (7) is the same as the rotating direction of the device, and the distance is not larger than the bending angle.
  5. 5. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 4 is characterized in that the bending angle of the arc-shaped guide plates (7) is 30-60 degrees, the distance is 200-300mm, the height ratio of the set height of the arc-shaped guide plates (7) to the height of the fin groups (1) in the corresponding areas is 1:1.2 in the high-temperature section, the low-temperature section is 1:1.5, arc-shaped grooves are machined on the surfaces of the arc-shaped guide plates (7), the width of the grooves is 50-80mm, and the depth of the grooves is 20-30mm.
  6. 6. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device is characterized in that a flexible sealing and heat insulation sleeve structure is adopted at the connecting part of a high-temperature section and a low-temperature section of a water inlet and outlet main pipe (3), a metal corrugated compensator is adopted in flexible sealing, an aluminum silicate fiber felt is adopted in the heat insulation sleeve, and the heat insulation sleeve is sleeved outside the connecting part.
  7. 7. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 1 is characterized in that the high-temperature section shell is lined with Al 2 O 3 -SiC-C refractory castable, and an outer layer pipeline of a high-temperature section of a water inlet and outlet main pipe (3) is made of 316L stainless steel and is additionally provided with a polytetrafluoroethylene anti-corrosion lining layer.
  8. 8. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device is characterized in that the fin group (1) adopts a multi-layer special-shaped double-sided bent section, when the rotary drum rotates clockwise, 2-4 layers of bent fins are arranged on the surface facing the high-temperature slag, 1-3 layers of bent fins are arranged on the surface facing away from the high-temperature slag, and one layer of bent fins is always arranged on the back surface of the fin group, which is smaller than the surface facing the high-temperature slag.
  9. 9. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 1, wherein the fin groups (1) are arranged in a cylindrical involute spiral ladder shape, the axial and radial distances between the adjacent fin groups (1) are gradually increased along the inlet and outlet directions, the distance between the adjacent fin groups at the inlet high-temperature end is minimum, and the distance between the adjacent fin groups at the outlet low-temperature end is maximum.
  10. 10. The full-automatic high-temperature slag dry method high-efficiency waste heat recovery device according to claim 1 is characterized in that the motor (8), the feed hopper (10), the discharge hopper (11), the feed hopper control valve (18), the discharge hopper control valve (19) and the water inlet connecting pipe (17) are respectively connected with a multi-parameter coupling full-automatic operation steam pressure self-adaptive control system.

Description

Full-automatic high-temperature slag dry method high-efficiency waste heat recovery equipment Technical Field The invention belongs to the technical field of solid waste recycling and industrial energy-saving waste heat recovery in the metallurgical industry, and particularly relates to full-automatic high-temperature slag dry method high-efficiency waste heat recovery equipment for treating high-temperature molten slag (the temperature is more than 1200 ℃) generated in the steelmaking process in the metallurgical industry. Background The high-temperature slag is slag (GB/T51387-2019) which is discharged in the smelting process of a converter, an electric furnace and a refining furnace and is formed by impurities in metal raw materials, fluxing agents and furnace linings and takes silicate, ferrite and oxide as main components, and mainly comprises converter slag, electric furnace slag, casting residues, flat slag and the like. Every 1 ton of crude steel is produced, 100-150 kg of high-temperature slag is produced, and the annual production of the high-temperature slag in China in recent years basically maintains or exceeds 1 hundred million tons. In addition, the recycling utilization rate is not high, so that about 7000 ten thousand tons of the waste water is about Wen Zhadui per year. This not only occupies a lot of land, but also causes pollution of soil, air and water. The high-temperature slag contains abundant heat energy, the slag tapping temperature is up to 1400-1600 ℃, and if the slag can be recycled, considerable energy-saving benefits can be brought. It is estimated that the recoverable sensible heat per ton of steel slag is up to 2GJ, which is equivalent to 41 kg of standard coal energy. If the sensible heat can be effectively recycled in steel factories in China, the standard coal amount which can be saved annually can reach more than 490 ten thousand tons. In addition, the energy-saving benefit can be further increased by recovering the heat energy in the steel slag and converting the heat energy into electric energy. The energy-saving benefit of the whole year is about 127 hundred million yuan calculated according to the recovery rate of 60 percent, and the huge potential of recycling the tapping slag is shown. However, the current steel slag treatment process and recycling approach mainly focuses on the recovery of steel slag substances, such as extraction of slag steel, magnetic separation powder and tailings. In the aspect of high-efficiency conversion and utilization of waste heat and residual energy of high-temperature metallurgical slag, no enough attention is paid in China, and particularly breakthrough of high-temperature steel slag waste heat recovery technology and equipment is a problem to be solved urgently. Aiming at the problem, a plurality of wet waste heat recovery technologies such as a roller method, an air quenching method, a hot closed tank method, a fluidized bed method and the like are developed by some enterprises and scientific research institutions at home and abroad, a small amount of water is taken in while the steel slag is treated, and the heat recovery is carried out on part of generated vapor and high-temperature air. The heat is subjected to multiple conversion of high-temperature slag, air, polluted water and clean water, so that the heat loss is large, and the problems of low heat recovery efficiency, serious equipment abrasion, high investment, high energy consumption, secondary pollution and the like of different degrees exist in the actual operation process, so that the effective recovery of the heat of the steel slag cannot be realized. In order to improve the waste heat recovery efficiency of the high-temperature slag, a waste heat recovery process for dry treatment of the high-temperature slag without water beating appears in the market. The principle is that after the high-temperature slag is crushed, the high-temperature slag is sent into a horizontal cylindrical waste heat recovery device through a feeder, the high-temperature slag moves along with the rotation of the device, and the heat-exchanged high-temperature slag is discharged from the other part of the device. The process equipment is characterized in that high-temperature slag is directly in solid-solid contact with a heat exchange water pipe, and the heat of the high-temperature slag is directly transmitted to clean water through a pipeline to form clean high-temperature steam. Compared with the previous wet process, the process can directly transfer the heat of the high-temperature slag to clean water, so that multiple heat transfer losses are avoided, and the heat exchange efficiency is effectively improved. The following technical drawbacks still remain: ① The traditional equipment mostly adopts a single temperature interval for heat exchange, high-low temperature step recovery is not realized, and the waste heat utilization efficiency is low (less than or equal to 70 percent); ② The f