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Introduction of Thermal Power Plants

Owing to the advantages of the low construction cost and stable operation of large capacity facilities, coal fired thermal power plants account for a significant portion of the world’s power generation. In Korea, it accounts for 39.4 %of the country’s total power generation capacity, a ratio that is expected to increase. With its high technical power, STX Heavy Industries began constructing the 1190 MW class Bukpyeong Thermal Power Plant, which is the first, large-scale, private-funded baseline thermal power plant, in December 2012.

화력발전 플랜트 조감도

Operating Principle of a Thermal Power Plant

A coal-fired thermal power plant burns coal to generates steam, which rotates the turbines to generate electricity. The coal burnt in the boilers generates high-pressure, high-temperature steam. The steam enters the turbines and rotates them by expanding while passing through the turbine blades. The kinetic energy of the turbine blades is converted to electric energy by the generator connected to the turbines.

Ultra-supercritical Boiler

Characteristics
  • Once-Through
  • Two-Pass Type
  • Ultra Supercritical Pressure
  • SH and RHoutlet temperature above 600℃
  • Coal Firing
  • Opposed Wall Fired
  • Divided Back Pass for R/H Control
Ultra-supercritical Boiler

Supercritical Boiler

Characteristics
  • Once-Through
  • Two-Pass Type
  • Supercritical Pressure
  • Coal, Oil and Gas Firing
  • Opposed Wall Fired
  • Gas-Recycling
Supercritical Boiler

Subcritical two-pass type

Characteristics
  • Natural Circulation
  • Two-Pass type
  • High Sub-critical Pressure : SOP=180bar(g)
  • Coal Firing
  • Opposed Wall Fired
  • Divided Back Pass for R/H Control
Subcritical two-pass type

Subcritical box type

Characteristics
  • Natural Circulation
  • Box Type Design
  • High Pressure : SOP=180bar(g)
  • Oil & Gas Fired
  • Low Nox Combustion System
  • Gas Recycling for R/H Control
Subcritical box type
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