PROCESS AND DEVICE FOR DESULPHURIZATION AND DENITRATION OF FLUE GAS
First Claim
1. A flue gas desulfurization-denitration process, comprising the following procedures:
- 1) afterheat recovery procedure;
the temperature of the flue gas is lowered to below 50°
C. in a heat exchange recovering way, and afterheat recovery is carried out;
2) desulfurization-denitration procedure;
the cooled flue gas enters into an absorption tower, sulfur dioxide and/or nitrogen oxides therein are absorbed by a desulfurization-denitration solution, and the said desulfurization-denitration solution is a composite solution containing polyol and/or polymeric polyol;
3) regeneration procedure of desulfurization-denitration solution;
in a regeneration tower, the desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by ways of heating and/or gas stripping and/or vacuum regeneration, and the desulfurization-denitration solution after regeneration is recycled for use;
4) sulfur dioxide and/or nitrogen oxides concentration procedure;
in a concentration tower, sulfur dioxide and/or nitrogen oxides released by the regeneration procedure of the desulfurization-denitration solution are concentrated into a product of sulfur dioxide and/or nitrogen oxides with a higher purity.
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Accused Products
Abstract
The invention discloses a process and device for desulfurization-denitration of a flue gas. A desulfurization-denitration solution is used in an absorption tower to absorb sulfur dioxide and/or nitrogen oxides from the flue gas or various combustion tail (waste) gases. The desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulfur dioxide and/or nitrogen oxides are further concentrated into a sulfur dioxide and/or nitrogen oxide product with a higher purity in a concentration tower. The regenerated desulfurization-denitration solution is recycled for use. The process and device have a wide range of industrial applications, and can be used for desulfurization and/or denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dyestuff plants, pollutant gases discharged from chemical fiber plants and other industrial raw material gases or waste gases containing SOx.
10 Citations
10 Claims
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1. A flue gas desulfurization-denitration process, comprising the following procedures:
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1) afterheat recovery procedure;
the temperature of the flue gas is lowered to below 50°
C. in a heat exchange recovering way, and afterheat recovery is carried out;2) desulfurization-denitration procedure;
the cooled flue gas enters into an absorption tower, sulfur dioxide and/or nitrogen oxides therein are absorbed by a desulfurization-denitration solution, and the said desulfurization-denitration solution is a composite solution containing polyol and/or polymeric polyol;3) regeneration procedure of desulfurization-denitration solution;
in a regeneration tower, the desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by ways of heating and/or gas stripping and/or vacuum regeneration, and the desulfurization-denitration solution after regeneration is recycled for use;4) sulfur dioxide and/or nitrogen oxides concentration procedure;
in a concentration tower, sulfur dioxide and/or nitrogen oxides released by the regeneration procedure of the desulfurization-denitration solution are concentrated into a product of sulfur dioxide and/or nitrogen oxides with a higher purity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A flue gas desulfurization-denitration device, comprising an afterheat recovery tower, an absorption tower, a regeneration tower and a concentration tower, wherein:
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The afterheat recovery tower;
is used for heat exchange between the flue gas and a heat storage fluid, lowering the temperature of the flue gas to below 50°
C., and carrying out afterheat recovery;The absorption tower;
is used for direct contact of the cooled flue gas with a desulfurization-denitration solution, the desulfurization-denitration solution absorbs sulfur dioxide and/or nitrogen oxides in the flue gas and turns into a desulfurization-denitration rich solution, and then is discharged from the absorption tower;
the said desulfurization-denitration solution is a composite solution containing polyol and/or polymeric polyol;The regeneration tower;
is used for the desulfurization-denitration rich solution to desorb sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration and turn into a desulfurization-denitration lean solution, the desulfurization-denitration lean solution obtained by regeneration is sent back to the absorption tower for recycle use;The concentration tower;
is used for removing, by condensation, water vapor from a mixed gas comprising sulfur dioxide and/or nitrogen oxides, which is released from the regeneration tower, sulfur dioxide and/or nitrogen oxides are condensed into a product of sulfur dioxide and/or nitrogen oxides with a higher purity. - View Dependent Claims (8, 9, 10)
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Specification