Nanjing JHR Multi-TUNNEL™️ of CCDR
Nanjing JHR’s Multi-TUNNEL™ of CCDR is a unique patented technology between the continuous casting machine (CCM) and the rolling mill. This technology provides a multi-flow fully enclosed tunnel installed on a CCM and roller tables，also called Insulating Multi-TUNNEL™ (All Side Insulation Control of billet Head-Tail temperature), or Heating Multi-TUNNEL™ (All Side Oxy-fuel Heating Control of billet Head-Tail Temperature). With Insulating Multi-TUNNEL™ or Heating Multi-TUNNEL™, CC billet heat losses can be reduced and all sides of the billet can be heated through installed oxygen burners and an intelligent tunnel furnace temperature control system, allowing the CC billet at required temperature to be delivered directly to the rolling mill for rolling.
Compared with traditional production lines, our patented technology uses neither heating furnaces nor electric induction heaters. The liquid steel passes through the continuous casting machine and is directly rolled into steel bars or wires within 15 minutes.
The rolling mill power consumption and load of the Multi-TUNNEL™️ of CCDR will not be increased due to the uniform head-tail temperature and high bulk temperature of CC billet. The production cost/carbon emissions/oxidation loss/pollution of the steel rolling process are significantly reduced since the tunnel does not require any conventional heating energy.
Since Nanjing JHR built the world’s first Multi-TUNNEL™️ of CCDR in 2014, it has achieved direct rolling of more than 120 streams of steel billets in Asia without the need for traditional heating furnaces. The Multi-TUNNEL™️ of CCDR reference projects have the following features:
l The arc radius of the billet CCM is R6-R12m.
l Streams of one single caster are up to 10; billet section is 150 - 180 mm sq., and billet length is up to 12 m and more.
l The biggest production rate of one direct rolling line is 250 t/h.
l The longest transportation distance between CC & rolling mill is 330 m.
l Steel grade includes construction steel, wire steel, alloy.
By Adopting TURNOUT™️ (Distribution and Scheduling Turnout for CCDR), the billet is possible to connect one CCM with one single rolling mill, and multi-CCMs with multi-rolling mills. Billets can be transported quickly one by one to one or several rolling mill(s) at temperature of 960-1100℃ for direct rolling.
|
ITEM |
Traditional process with heating furnaces (HF) |
Insulating Multi-TUNNEL™ |
Heating Multi-TUNNEL™ |
|
Heat consumption & Cost |
Energy 1.05GJ or Cost $10/t steel |
0 |
Energy 0.06GJ or Cost $1/t steel |
|
CO2 emissions |
40-80kg/t steel |
0 |
Near 0 |
|
Waste gas pollution |
NOx/CO2/dust，need treatment |
No waste gas pollution |
Minized waste gas pollution; No treatment is needed |
|
Billet Oxidation loss |
0.5-0.8% |
0 |
Near 0.1% |
|
Production flexibility |
HF CANNOT be turned on or off at any time. |
Allow CCM and rolling mill to turn on and off SIMULTANEOUSLY AT ANY TIME. |
|
Rolling temperature |
surface/core：1050℃;
12m head-tail temperature difference＜30℃ |
surface/core：960/1100℃;
12m head-tail temperature difference＜50℃ |
surface/core：980/1100℃;
12m head-tail temperature difference＜30℃ |
|
Rolling power consumption |
Same |
|
Product performance |
Normal |
Optimized performance thanks to higher core temperature. | | 
