Page 11 - Design of Solar Thermal Power Plants

4 1. INTRODUCTION

line with existing Chinese state standards and regulations for saving land,
water conservancy, and environmental protection, as well as exercising
requirements for labor safety and industrial hygiene.

1.1.1 Constitution of the Solar Thermal Power Plant
An CSP plant consists of three major units: solar energy collection,
thermal energy storage, and a thermal power generation unit. The first
two mainly include the irradiation concentrator, the receiver, thermal
storage, and the evaporator, whereas the last mainly includes the turbine,
the power generator, control of the power cycle, the electricity system,
water treatment, and the supply system.
Capacity of an CSP plant shall be determined according to the capacity
of the generator unit, which is irrelevant to solar irradiation resources,
environmental and meteorological conditions and concentrator power.
Power plants of equivalent capacity may correspond to concentration
fields (mirror fields) of different sizes.
An CSP plant can be constructed economically by using combined
heating and electricity based on solar direct normal irradiation (DNI)
resources, the current status of the local power load, and thermal load.
CSP can be complemented by coal, petroleum, or natural gas in a
mixed-fuel power plant constructed according to circumstances in areas
with an abundant solar resource and coal or petroleum resources.
According to the needs of thermal and power load development in
corporate planning, construction of a self-contained heating-type CSP
plant with an appropriate scale is suggested.

1.1.2 Selection of Pressure Parameters for Power
Generation Units
It is suggested that the water steam pressure parameters of generator
units be selected according to unified short-term and long-term con-
struction plans while being in-line with the following rules:
1. For a generator unit with a stand-alone capacity of 1.5 MW and
below, a medium-pressure (MP) or lower MP steam turbine is
suggested. For one with a stand-alone capacity of 3 MW, a MP steam
turbine is suggested. For one with a stand-alone capacity of 6 MWor
above, an MP or secondary high-pressure (HP) steam turbine is
suggested.
2. For a condensing-type generator unit with a stand-alone capacity of
3 MW, lower MP parameters are suggested; for one with a stand-
alone capacity of 6 MW or above, MP or lower HP parameters are
suggested.