As sulphur oxide and nitrogen oxide contribute to acid rain and are an origin of ozone gas formation, they have caused many social problems in recent years. But, this has nearly been solved by technical development.
Sulphur oxide (SOx)
Sulphur oxide is reduced through the use of high-quality fuels such as coal containing low sulphur. Moreover, it is completely removed through the installation and operation of desulfurization facilities.
Situation of nitrogen oxide emissions
| Section | Regulation (ppm) | Emission (ppm) | Power Plant |
|---|---|---|---|
| Solid fuel | 50 ~ 70 | 17 ~ 27 | Hadong, Samcheok T/p |
| Liquid fuel | 55 ~ 220 | 40 ~ 170 | Namjeju T/P, Hanlim CC |
| Gas fuel | 25 ~ 40 | 6 ~ 30 | Shinincheon, Busan, Youngwol, Andong T/P |
Measures of NOx emission control
| Power Plant | Unit | Capacity(M/W) | Completion |
|---|---|---|---|
| Hadong T/P | #1 | 500 × 8 | '98.12 |
| #2 | '99.05 | ||
| #3 | '99.02 | ||
| #4 | '99.03 | ||
| #5 | '00.07 | ||
| #6 | '01.07 | ||
| #7 | '08.12 | ||
| #8 | '09.06 | ||
| Namjeju T/P | energy #3 | 100 × 2 | '06.09 |
| energy #4 | '07.03 |
Nitrogen oxide(NOx)
Nitrogen oxide emissions are reduced through the installation of denitrification facilities and low-NOx combustion facilities such as two-stage combustion, improved low-NOx burners, water injection facilities SCR & SNCR, etc.
Situation of nitrogen oxide emissions
| Section | Regulation (ppm) | Emission (ppm) | Power Plant |
|---|---|---|---|
| Solid fuel | 50 ~ 70 | 17 ~ 27 | Hadong, Samcheok T/p |
| Liquid fuel | 55 ~ 220 | 40 ~ 170 | Namjeju T/P, Hanlim CC |
| Gas fuel | 25 ~ 40 | 6 ~ 30 | Shinincheon, Busan, Youngwol, Andong T/P |
Measures of NOx emission control
Nitrogen oxide is formulated by the combination of oxygen and nitrogen contained in the air or fuel at high temperatures in the boiler. The higher the temperature, the more nitrogen oxide is emitted.
| Measures | Contents |
|---|---|
| Low NOx Burner | Air for combustion is divided by 3 parts, with one used for the combustion mixture, another for reducing the highest temperature of the flame, and another for complete fuel combustion |
| 2-stage combustion | The air volume required for complete combustion of fuel is supplied in two stages (at the burner inlet and at the burner top) |
| Low-supplied air | Air for combustion is decreased to reduce the amount of oxygen combining with nitrogen in the fuel |
| Flue gas Recirculation | Part of the exhausted gas from the boiler is mixed with air for recombustion to reduce the combustion temperature |
Installation of high denitrification facilities
IInstallation of high-tech denitrification facilities Nitrogen oxide emissions are reduced through the installation of the SCR (Selective Catalytic Reduction) at Hadong #1~8, Namjeju internal combustion #1~4, #2 and a low Nox burner at Shinincheon, Busan and Yeongwol C/C. State-of-the-art denitrification facilities will be installed and operated in newly-constructed plants.
Dust
The high-efficiency electrostatic precipitator (coal-fired plants: over 99.5%, heavy oil fired plants: over 80%) is installed and operated in all our plants except for the LNG-fired plants.
| Section | Regulation (ppm) | Emission (ppm) | Power Plant |
|---|---|---|---|
| Solid fuel (mg/S㎥) | 10 ~ 15 | below 5 | Hadong, Samcheok T/P |
| Liquid fuel(mg/S㎥) | 15~20 | below 5 | Namjeju T/P, Hanlim CC |
After dust is removed by the electrostatic precipitator in the first cleansing, over 60% of the remainder is removed with desulfurization facilities. Flue gas emission controls to reduce the amount of dust by 25% are installed and operated in some plants.
