FLUE GAS-TREATING METHOD AND APPARATUS FOR TREATING ACIDIC TAIL GAS BY USING AMMONIA PROCESS
First Claim
1. A flue gas-treating method for treating acid tail gas by using an ammonia process, characterized in that, comprising the following steps of:
- 1) according to the concentration of sulfur dioxide in the tail gas, adding air into the raw tail gas to make the concentration of sulfur dioxide reach a suitable absorbing condition;
the concentration of sulfur dioxide to be introduced into the absorber is ≦
30,000 mg/Nm3;
2) setting process water spray cooling and/or ammonium sulfate solution spray cooling in the inlet duct of the absorber or inside the absorber, in order to cool and wash the tail gas;
when using the ammonium sulfate solution spray cooling, the concentration of ammonium sulfate solution is increased;
3) providing an oxidation section in the absorber, wherein the oxidation section is provided with oxidation distributors for oxidizing the desulfurization absorption solution;
4) providing an absorption section in the absorber wherein the absorption section achieves desulfurization spray absorption by using absorption solution distributors via an absorption solution containing ammonia;
the absorption solution containing ammonia is supplied by an ammonia storage tank;
5) providing a water washing layer above the absorption section in the absorber, wherein the water washing layer washes the absorption solution within the tail gas to reduce the cscapcslip of the absorption solution;
6) providing a demister above the water washing layer inside the absorber to control the concentration of mist droplets contained in the cleaned tail gas;
the process of the flue gas-treating method for treating acid tail gas by using an ammonia process is described as follows;
the concentration of sulfur dioxide in the acid tail gas is adjusted through adding the air from an air blower inside the inlet duct of the absorber;
the process gas flows into the absorber after being cooled by the cooling spray layer at the inlet of the absorber or/and by the cooling spray layer of the ammonium sulfate solution in the absorber;
sulfur dioxide is removed after being cleaned by the absorption spray layer inside the absorber;
after washing and absorption in the water washing layer, mist droplets are removal via the demister, and the cleaned tail gas is discharged from a stack through a cleaned gas duct.
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Abstract
A flue gas-treating method for treating acid tail gas by using an ammonia process, comprising the following steps of: 1) controlling the concentration of sulfur dioxide in an acid tail gas entering an absorber to be ≦30,000 mg/Nm3; 2) spraying and cooling with a process water or/and an ammonium sulfate solution in the inlet duct of the absorber or inside the absorber; 3) providing an oxidation section in the absorber, wherein the oxidation section is provided with oxidation distributors for oxidizing the desulfurization absorption solution; 4) providing an absorption section in the absorber wherein the absorption section achieves desulfurization spray absorption by using absorption solution distributors via an absorption solution containing ammonia; the absorption solution containing ammonia is supplied by an ammonia storage tank; 5) providing a water washing layer above the absorption section in the absorber, wherein the water washing layer washes the absorption solution in the tail gas to reduce the slip of the absorption solution; 6) providing a demister above the water washing layer inside the absorber to control the concentration of mist droplets contained in the cleaned tail gas. In the coal chemical industry, the integration of the Claus sulfur recovery process and the ammonia desulfurization technology can reduce the investment of the post-treatment and simplify the operation process, and provide intensive advantages to the environmental control of plants.
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Citations
10 Claims
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1. A flue gas-treating method for treating acid tail gas by using an ammonia process, characterized in that, comprising the following steps of:
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1) according to the concentration of sulfur dioxide in the tail gas, adding air into the raw tail gas to make the concentration of sulfur dioxide reach a suitable absorbing condition;
the concentration of sulfur dioxide to be introduced into the absorber is ≦
30,000 mg/Nm3;2) setting process water spray cooling and/or ammonium sulfate solution spray cooling in the inlet duct of the absorber or inside the absorber, in order to cool and wash the tail gas;
when using the ammonium sulfate solution spray cooling, the concentration of ammonium sulfate solution is increased;3) providing an oxidation section in the absorber, wherein the oxidation section is provided with oxidation distributors for oxidizing the desulfurization absorption solution; 4) providing an absorption section in the absorber wherein the absorption section achieves desulfurization spray absorption by using absorption solution distributors via an absorption solution containing ammonia;
the absorption solution containing ammonia is supplied by an ammonia storage tank;5) providing a water washing layer above the absorption section in the absorber, wherein the water washing layer washes the absorption solution within the tail gas to reduce the cscapcslip of the absorption solution; 6) providing a demister above the water washing layer inside the absorber to control the concentration of mist droplets contained in the cleaned tail gas; the process of the flue gas-treating method for treating acid tail gas by using an ammonia process is described as follows;
the concentration of sulfur dioxide in the acid tail gas is adjusted through adding the air from an air blower inside the inlet duct of the absorber;
the process gas flows into the absorber after being cooled by the cooling spray layer at the inlet of the absorber or/and by the cooling spray layer of the ammonium sulfate solution in the absorber;
sulfur dioxide is removed after being cleaned by the absorption spray layer inside the absorber;
after washing and absorption in the water washing layer, mist droplets are removal via the demister, and the cleaned tail gas is discharged from a stack through a cleaned gas duct. - View Dependent Claims (2, 3, 4, 5)
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6. A flue gas-treating apparatus for treating acid tail gas by using an ammonia process, characterized in that, comprising an absorber (16), an air blower (2), an ammonia solution tank (3), an absorber oxidation section (4), an absorption circulation pump (5), an ammonium sulfate storage tank (6), an ammonium sulfate discharge pump (7), an inlet duct of the absorber (8), a cleaned gas duct (9), a stack (10), a demister (11), a water washing layer (12), an absorber absorption spray layer (13), a cooling washing pump (14), an inlet cooling washing spray layer (15), and a spraying pump (17), wherein the inlet duct is connected to the air blower (2);
- a process water or/and ammonium sulfate solution cooling and spraying device is set in the inlet duct of the absorber or inside the absorber;
an oxidation section (4) is provided in the absorber (16), wherein the oxidation section (4) is provided with oxidation distributors for oxidizing the desulfurization absorption solution;
an absorption section is provided in the absorber (16) wherein the absorption section achieves desulfurization spray absorption by using absorption solution distributors via an absorption solution containing ammonia;
an oxidation blower (1) is provided in the oxidation section (4);
a solution generated by the oxidation section (4) is transported into the ammonium sulfate storage tank (6) and transported out of the apparatus by an ammonium sulfate discharge pump (7);
the cooling spray layer is the cooling spray with a coverage rate over 200%, while the absorption spray layer (13) consists of two to four layers of spray with the spray tower type or the packed tower type, and the spray coverage rate for each layer is more than 250%. - View Dependent Claims (7, 8, 9, 10)
- a process water or/and ammonium sulfate solution cooling and spraying device is set in the inlet duct of the absorber or inside the absorber;
Specification