Page 238 - Design of Solar Thermal Power Plants

3.9 MAIN POINTS FOR POWER PLANT SITE PLAN 221

10. Drainage of power plant. Drainage of a solar power plant includes
production water supply and domestic water supply. As the
amount of water for washing the surfaces of concentrators is
insignificant, site drainage can be neglected. Normally, for power
plants located in Gobi areas and deserts, rainwater can be drained
off in natural ways. After being treated, power condenser water can
be used for irrigation and for washing mirror surfaces.
11. Power plant general lay-out planning factors. A thermal power
plant normally consists of four sections, including the collector
field, thermal storage area, generating area and office area.
A collector field contains both solar concentrator and thermal
receiver; dimension of the concentration field shall be indicated
on the general layout. For a parabolic trough system, combination
pattern of thermal collection units shall be indicated, such as the
quantity of units in order to constitute a fluid serial loop, and the
quantity of loops in order to constitute a power plant concentration
field through parallel connection. As the heliostat, concentration
field layout drawing shall be prepared. The concentration field can
use a northward sector layout or circumferential circular/oval
layout. Position and height of receiver tower shall be marked on
the concentration field drawing accordingly.
Core area of a power plant normally consists of the main
powerhouse, control room, thermal storage area, power tower, etc.
The entire plant area layout shall be based on the process
requirements and architectural function division while fully
utilizing the limited land within the plant area.
A plant area consists of two sections, the concentrator field and
the generating area. Due to large landscape in the concentration
field that cannot be combined into the floorage, it shall be
considered accordingly when calculating the floor area ratio of the
power plant; otherwise, it may result in the conflict between it
and the floor-area ratio of construction land required by the state
in regulations and norms. It shall be calculated based on the
forestation of the power plant and land coverage of the generating
area.
12. Power plant general elevation planning factors. The concentration
field of a tower power plant does not have strict requirement on the
site evenness; even the slope of mountains can be utilized wisely to
facilitate concentration field layout, which is very conductive for
taking advantage of the mountain resources in China. For the
concentration field of a parabolic trough power plant, due to the
flow passage consisting of the evacuated tubes and requirements