chapter - 1 introduction - Meghalaya State Pollution Control Board

Hills Cement Co. Limited.
transfer pumps with standby facility. The level inside the deaerated feed
water storage tank shall be maintained at constant set valves by controlling
the quantum of feed pumped by the transfer pumps.
The deaerated feed water from the feed water storage tank will be supplied
to the steam generator by means of boiler feed water pumps of adequate
capacity to cater the requirements of 45 TPH Boiler. To cater the make-up
water requirement of the steam generation/turbine cycle, a demineralization
water plant having capacity of 4 cum / hr is proposed.
COMPRESSED AIR SYSTEM
To cater the requirement of the compressed air for instruments and the
control systems two compressors rated for 100 N.Cu.M/hr at 8.0 Kg/Cm 2
shall be installed. The air compressor shall be provided with accessories like
inter cooler, moisture separators, air dryers, air receivers, and control panel.
Two stage reciprocating air compressors shall be belt driven, oil free, nonlubricating
type. The design of the reciprocating compressor shall be in
accordance with API 618. The rotating parts shall be dynamically balanced
according to the standard to minimize noise and vibrations.
VENTILATION AND AIR CONDITIONING SYSTEM
Air-conditioning systems, where required with suitable natural as well as
mechanical ventilation be proved for various plant areas. Filtered air supply
and exhaust arrangements shall be provided for MCC rooms and switchgear
rooms. The rooms shall be kept under positive pressure of +5 mm by means
of gravity louvers. Necessary roof extractors will be provided in the machine
bay to ensure at least ten (10) number of air change.
DC Power supply System
The essential loads within the power plant which are too maintained during
an emergency situation are listed below:
Emergency lube oil pump
¾
¾
Emergency lighting
Control power supply to various switchboards, electrical control panels
of 11 kV.
Annunciation system
In order to meet the above requirement at 110 V DC, Maintenance free lead
acid battery bank of adequate capacity along with charger unit will be
provided. The battery capacity will be designed based on 30 min supply to
the essential auxiliaries and one-hour duration for emergency lighting
Pollution Control Consultants (India) Pvt. Ltd. 27