METHOD AND DEVICE FOR PROVIDING REDUCTION GAS FROM GENERATOR GAS
A method for providing reduction gas for iron ore reduction by cooling and dry dedusting generator gas produced in a melter gasifier for pig iron production, as well as a device for carrying out such method, are provided. The generator gas may be cooled both by water injection and by heat exchange after it has been discharged from the melter gasifier and before a dry dedusting thereof.
1 . A method for providing reduction gas for iron ore reduction by cooling and dry dedusting generator gas produced in a melter gasifier for pig iron production, comprising:
cooling the generator gas both by water injection and by heat exchange after it has been discharged from the melter gasifier and before the dry dedusting thereof.
2 . The method of claim 1 , wherein the heat exchange is effected using a liquid heat exchange medium.
3 . The method of claim 2 , wherein the liquid heat exchange medium comprises water.
4 . The method of claim 1 , wherein the liquid heat exchange medium comprises thermal oil.
5 . The method of claim 1 , wherein the water injection is effected before the heat exchange.
6 . The method of claim 5 , wherein the inlet temperature of the liquid heat exchange medium lies within a temperature range between a minimum temperature of 70° C. and a maximum temperature of 450° C.
7 . The method of claim 1 , wherein the water injection is regulated in accordance with the temperature of the generator gas after the heat exchange.
8 . The method of claim 1 , wherein the water injection is regulated in accordance with the temperature of the reduction gas produced by the dry dedusting.
9 . The method of claim 1 , wherein the quantity of heat withdrawn from the generator gas per unit of time during the heat exchange is regulated by changing at least one of (a) the temperature of the heat exchange medium and (b) the quantity of heat exchange medium supplied per unit of time.
10 . A device for providing reduction gas for iron ore reduction by cooling and dry dedusting generator gas produced in a melter gasifier for pig iron production, comprising:
a reduction reactor for reducing iron ore by means of a reduction gas, and
a melter gasifier for producing generator gas by gasifying carbon carriers in the presence of oxygen and pre-reduced iron carriers,
wherein the melter gasifier and the reduction reactor are connected by a gas line,
a dry dedusting device arranged in the gas line,
a water injection device and a heat exchange device arranged in the gas line between the melter gasifier and the dry dedusting device, both the water injection device and the heat exchange device being configured to cool the generator gas after it has been discharged from the melter gasifier and before reaching the dry dedusting device.
11 . The device of claim 10 , wherein the device for heat exchange comprises with a feed line for liquid heat exchange medium.
12 . The device of claim 10 , wherein the water injection device is arranged between the melter gasifier and an end of the heat exchange.
13 . The device of claims 10 , wherein the heat exchange devices comprises a cooling jacket heat exchanger.
14 . The device of claim 13 , wherein the cooling jacket heat exchanger comprises a cooling jacket with a helical guide for heat exchange medium.
15 . The method of claim 1 , wherein the water injection is effected before and during the heat exchange.
16 . The method of claim 5 , wherein the inlet temperature of the liquid heat exchange medium lies within a temperature range between 70° C. and 150° C.