Denitrification apparatus
View Patent ↗There is provided a denitrification apparatus capable of reducing NOx from a combustion facility and preventing evaporation of a reducing liquid in a lance and an injection nozzle in the combustion facility in operation at a low load by adjusting concentration of a reducing agent, thereby achieving complete evaporation of the reducing liquid in an exhaust gas duct. The denitrification apparatus of the present invention includes: a nozzle for spraying a reducing liquid containing a reducing agent for reducing nitrogen oxides in exhaust gas discharged from a combustion facility into the exhaust gas by using a flow of gas; a gas supply unit for supplying the gas to the nozzle; a reducing liquid supply unit for supplying the reducing liquid to the nozzle; and a concentration control unit for adjusting concentration of the reducing agent on the basis of a temperature of the exhaust gas and a supply amount of the reducing liquid by supplying a diluting liquid to the reducing liquid so that the reducing agent is not vaporized in the reducing liquid supply unit.
1. A denitrification apparatus comprising:
a nozzle for spraying a reducing liquid containing a reducing agent for reducing nitrogen oxides in exhaust gas discharged from a combustion facility into the exhaust gas by using a flow of gas;
a gas supply unit for supplying the gas to the nozzle;
a reducing liquid supply unit for supplying the reducing liquid to the nozzle; and
a concentration control unit for adjusting concentration of the reducing agent on the basis of a temperature of the exhaust gas and a supply amount of the reducing liquid by supplying a diluting liquid to the reducing liquid so that the reducing agent is not vaporized in the reducing liquid supply unit.
2. A denitrification apparatus comprising:
a nozzle for spraying a reducing liquid containing a reducing agent for reducing nitrogen oxides in exhaust gas discharged from a combustion facility into the exhaust gas by using a flow of gas;
a gas supply unit for supplying the gas to the nozzle;
a reducing liquid supply unit for supplying the reducing liquid to the nozzle; and
a concentration control unit for adjusting concentration of the reducing agent on the basis of a temperature of the exhaust gas and a supply amount of the reducing liquid by supplying a diluting liquid to the reducing liquid so that the reducing agent is not vaporized in the reducing liquid supply unit,
the concentration control unit adjusting a gas-to-liquid ratio of the gas and the reducing liquid on the basis of the temperature of the exhaust gas by supplying the diluting liquid to the reducing liquid so that a drop size of the reducing liquid sprayed from the nozzle becomes a predetermined size.
3. A denitrification apparatus comprising:
a nozzle for spraying a reducing liquid containing a reducing agent for reducing nitrogen oxides in exhaust gas discharged from a combustion facility into the exhaust gas by using a flow of gas;
a gas supply unit for supplying the gas to the nozzle;
a reducing liquid supply unit for supplying the reducing liquid to the nozzle; and
a concentration control unit for adjusting concentration of the reducing agent on the basis of a temperature of the exhaust gas and a supply amount of the reducing liquid by supplying a diluting liquid to the reducing liquid so that the reducing agent is not vaporized in the reducing liquid supply unit,
the concentration control unit adjusting a gas-to-liquid ratio of the gas and the reducing liquid on the basis of the temperature of the exhaust gas by supplying the diluting liquid to the reducing liquid so that a drop size of the reducing liquid sprayed from the nozzle becomes a predetermined size, and
the nozzle serving as a two-fluid nozzle.
4. The denitrification apparatus according to claim 1 , wherein the concentration control unit adjusts a supply amount of the diluting liquid to be substantially constant regardless of a load of the combustion facility.
5. The denitrification apparatus according to claim 2 , wherein the concentration control unit adjusts a supply amount of the diluting liquid to be substantially constant regardless of a load of the combustion facility.
6. The denitrification apparatus according to claim 3 , wherein the concentration control unit adjusts a supply amount of the diluting liquid to be substantially constant regardless of a load of the combustion facility.
7. The denitrification apparatus according to claim 1 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases.
8. The denitrification apparatus according to claim 2 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases.
9. The denitrification apparatus according to claim 3 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases.
10. The denitrification apparatus according to claim 1 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases, and adjusts the supply amount of the diluting liquid so that a supply amount of the reducing liquid becomes substantially constant regardless of a load of the combustion facility.
11. The denitrification apparatus according to claim 2 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases, and adjusts the supply amount of the diluting liquid so that a supply amount of the reducing liquid becomes substantially constant regardless of a load of the combustion facility.
12. The denitrification apparatus according to claim 3 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases, and adjusts the supply amount of the diluting liquid so that a supply amount of the reducing liquid becomes substantially constant regardless of a load of the combustion facility.
13. The denitrification apparatus according to claim 1 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases, and adjusts the supply amount of the diluting liquid so that a gas-to-liquid ratio of the gas and the reducing liquid becomes substantially constant regardless of a load of the combustion facility.
14. The denitrification apparatus according to claim 2 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases, and adjusts the supply amount of the diluting liquid so that a gas-to-liquid ratio of the gas and the reducing liquid becomes substantially constant regardless of a load of the combustion facility.
15. The denitrification apparatus according to claim 3 , wherein the concentration control unit reduces a supply amount of the diluting liquid as a load of the combustion facility increases, and adjusts the supply amount of the diluting liquid so that a gas-to-liquid ratio of the gas and the reducing liquid becomes substantially constant regardless of a load of the combustion facility.