Gas-cleaning apparatus and method for high-pressure blast furnace
First Claim
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1. A gas-cleaning installation for a pressurized blast furnace comprising, in combination:
- particle-separation means connected to a gas outlet of said pressurized blast furnace for removing particulates from a gas emerging therefrom;
a wash tower connected to said particle-separation means, said tower being provided with spray nozzles for scrubbing gas from said particle-separation means with water, and a venturi scrubber downstream from said spray nozzles;
a turbine unit receiving gas from said venturi scrubber, said turbine unit including an expansion turbine, a gas bypass bridged across said turbine, and means for selectively cutting off said turbine and rendering said turbine effective; and
wash-water preparation means for receiving water from said wash tower and recycling water to said nozzles, said wash-water preparation means including;
settling means for settling solids from wash water derived from said wash tower,a collecting reservoir for receiving water from said settling means,cooling means connectable with said reservoir for subjecting wash water to be recycled to cooling,a water bypass connected to said reservoir and across said cooling means for delivering uncooled water to said tower, andcontrol means for rendering said water bypass effective when said turbine is operative to deliver relatively warm water to said wash tower and for cutting off said water bypass and rendering said cooling means effective when said turbine is inoperative.
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Abstract
The gases emerging from a high-pressure gas furnace are subject to coarse particle separation and then to washing and scrubbing with water before driving an expansion turbine which has a gas bypass so that the turbine can be cut off. The scrubbing water recycled to the scrubber when the turbine is cut off, is permitted to traverse a cooler of the washing-water recovery unit but, when the turbine is operative, the scrubbing water bypasses the cooler. The water introduced into the scrubber can thus have a temperature of about 25° C. when the turbine is bypassed and about 50° C. when it is effective.
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Citations
9 Claims
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1. A gas-cleaning installation for a pressurized blast furnace comprising, in combination:
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particle-separation means connected to a gas outlet of said pressurized blast furnace for removing particulates from a gas emerging therefrom; a wash tower connected to said particle-separation means, said tower being provided with spray nozzles for scrubbing gas from said particle-separation means with water, and a venturi scrubber downstream from said spray nozzles; a turbine unit receiving gas from said venturi scrubber, said turbine unit including an expansion turbine, a gas bypass bridged across said turbine, and means for selectively cutting off said turbine and rendering said turbine effective; and wash-water preparation means for receiving water from said wash tower and recycling water to said nozzles, said wash-water preparation means including; settling means for settling solids from wash water derived from said wash tower, a collecting reservoir for receiving water from said settling means, cooling means connectable with said reservoir for subjecting wash water to be recycled to cooling, a water bypass connected to said reservoir and across said cooling means for delivering uncooled water to said tower, and control means for rendering said water bypass effective when said turbine is operative to deliver relatively warm water to said wash tower and for cutting off said water bypass and rendering said cooling means effective when said turbine is inoperative. - View Dependent Claims (2, 3, 4, 5)
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6. In a method of operating a plant for the cleaning of gas from a pressurized blast furnace wherein the gas withdrawn from said blast furnace is subjected to particle removal, the gas after particle removal is washed with water and then scrubbed in a venturi scrubber, the gas after scrubbing can be subjected to expansion in an expansion turbine, and the water for the washing and scrubbing of the gas is recycled after cleaning, the improvement which comprises:
supplying recycled wash water at a temperature of about 50°
C. to the washing and scrubbing of the gas when the gas is thereafter subjected to expansion, and supplying the water to the washing and scrubbing of the gas at a temperature of about 25°
C. when the gas is not expanded.- View Dependent Claims (7, 8, 9)
Specification