Nature protection technologies

6.1. Improvement of the heat cycle of steam-turbine TPPs

Part 6. ADVANCED TECHNOLOGIES AND POWER INSTALLATIONS FOR THERMAL AND ELECTRIC ENERGY GENERATION

6.1. Improvement of the thermal cycle of traditional combined-cycle TPPs

6.1.1. Influence of initial steam parameters on thermal economy of power plants

Ilyin Е.T. CJSC “Complex energy systems”, Tishin S.G. MPEI(TU)

Methods of increase in thermal economy of power plants are well-known. Let’s consider the opportunities for power plant efficiency increase due to application of traditional methods. Heat and nuclear power plants operate under the Rankin cycle. Thermal efficiency ηt of the Rankin cycle significantly depends on a number of factors and, firstly, on initial steam parameters before the turbine: pressure p0 and temperature t0.

Part 6. ADVANCED TECHNOLOGIES AND POWER INSTALLATIONS FOR THERMAL AND ELECTRIC ENERGY GENERATION

6.1. Improvement of the thermal cycle of traditional combined-cycle TPPs

6.1.2. Influence of steam superheating on thermal economy of a steam-turbine plant

Ilyin Е.T. CJSC “Complex energy systems”, Tishin S.G. MPEI(TU)

Significant fuel safety can be reached due to application of intermediate superheating. For condensing installation the inner absolute efficiency is defined from the relation:

hi = Hi/q0

where Нi is work, performed by 1 kg of steam in the wheel space, kJ/kg; q0 is a volume of heat, supplied to the working substance, kJ/kg.

Part 6. ADVANCED TECHNOLOGIES AND POWER INSTALLATIONS FOR THERMAL AND ELECTRIC ENERGY GENERATION

6.1. Improvement of the thermal cycle of traditional combined-cycle TPPs

6.1.3. Effect of regenerative heating of condensate and feed water on thermal economy of the plant

Ilyin Е.T. CJSC “Complex energy systems”, Tishin S.G. MPEI(TU)

For straight-condensing power plants, application of regeneration leads to increase in thermal economy, since by that heat losses in the cool source – a condenser of the turbine plant are reduced.

Part 6. ADVANCED TECHNOLOGIES AND POWER INSTALLATIONS FOR THERMAL AND ELECTRIC ENERGY GENERATION

6.1. Improvement of the thermal cycle of traditional combined-cycle TPPs

6.1.4. Experience of using ultra supercritical steam parameters

Ilyin Е.T. CJSC “Complex energy systems”, Tishin S.G. MPEI(TU)

Presently in Russia and other countries power units with overcritical parameters are widely used with initial pressure p0 = 23,57 МPа and temperature of direct steam t0 = 540°С, with single intermediate superheating with parameters ppp=3,6 МPа and tpp = 540°С.

Part 6. ADVANCED TECHNOLOGIES AND POWER INSTALLATIONS FOR THERMAL AND ELECTRIC ENERGY GENERATION

6.1. Improvement of the thermal cycle of traditional combined-cycle TPPs

6.1.5. Estimation of costs at the combined heat and electricity generation at CHPP

Ilyin Е.T. CJSC “Complex energy systems”, Tishin S.G. MPEI(TU)

At CHPP a problem of cost sharing between two types of products became acute recently again. It is explained by thermal energy overrating at application of widely used physical method for cost differentiation. Along with this physical method, many authors recommend to use the exergic method (direct opposite to a physical one).