Bandar abbas steam power plant project (4x350 mw)

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Название	Bandar abbas steam power plant project (4x350 mw)
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Air filtration efficiency.

Filters shall be selected to effectively filter all fresh air into building and all re-circulated air.

2.1. Fresh air filtration requirements

Fresh inlets and outlets shall be fitted with sand trap louvers.
The efficiency of the sand trap louvers shall be determined according the sand size, air velocity and environmental condition of thermal power plant sites (not less than 80% with 1 m/s air velocity) and shall be approved by engineer.
The characteristics of the filtration shall be as follows :

Pre-filter section: 65% efficient according to the ASHRAE weight arrestance test Gravimetric method.

Filter section: 80% efficient according to ASHRAE dust spot test (opacimetric Method). Control Building, Laboratory.

Filter section: 60% efficient according to ASHRAE dust spot test (opacimetric method).

A differential manometer shall be installed on each pre-filter and filter.

2.2. Re-circulated air filtration requirements for Control and Instrument Room.

Re-circulating air conditioning units of control room and instrument technical room shall be filtered according to the ASHRAE dust spot test (opacimetric method).

2.3. Re-circulated Air Filtration Requirements for Other Rooms (such as Split packaged air-conditioning units, etc.)

The Contractor shall submit Vendor's standards to Engineer for approval.

Split packaged air-conditioning units: 70 % efficient according to the ASHRAE weight Arrestance test (gravimetric method).

Calculations.

3.1. Heating and Cooling Loads Calculation.

Calculation method shall be developed by using a computer program based on the ASHRAE.

3.2. Make up Air Calculation.

Make-up air quantity shall take into account:

The minimum fresh air quantity in respect with rooms occupancy and equipment requirements.
The exhaust air requirement
The indoor overpressure with respect to outdoor, where applicable.
In the Battery rooms the minimum air flow rate shall be determined as follows (ref. DIN norm 5751 D/VDE 0510.):

Q=55*h*I

Q - litre of air per hour;

h - number of cells;

I - charging current in amps, at end of high rate charging but not less than 25 Percent of rated charge output.

3.3. Ductwork and Fans Calculation.

Maximum allowable air velocity in ducts shall be:

a) Ducting in manned areas:

6 m/s (in branches);
10 m/s (in main runs).

b) Ducting in unmanned areas 12 m/s.

c) Supply grilles in manned areas 2 m/s.

d) Supply grilles in unmanned areas 5 m/s.

e) Perforated floor diffusers 500 m³/h - approximately air supply for a Perforated floor diffuser of 0.6 m x 0.6m dimensions.

3.4. Pipe work Calculation.

Calculation shall be developed using established design methods as given in ASHRAE Handbook Fundamentals or similar approved methods.

3.5. Temperature differences between ambient and blown air.

Temperature differences between ambient and blown air shall be never higher than the following:

high induction diffusers – 12°C;
high induction linear – 12°C;
Other grilles – 10°C;
Floor grilles – 6÷7°C.

3.6. Equipment installed capacity and stand-by Equipment over capacity:

- DX cooling coils +10%
- Electric heaters +10%
- Air cooled condensing units +10%

Stand-by equipment for sensitive areas

All sensitive areas (such as control rooms, telecom room, electrical room …) HVAC cooling equipment shall be duplicated (duty/stand-by with an automatic change-over) in order to ensure continuous duty.

Battery rooms: Exhaust fans (duty/stand-by).

Central Chilled and Hot Water Supply Plant

One central chilled and hot water supply plant with all ancillary equipment shall be provided by the contractor for the buildings and areas of his scope of work.

The tasks of this plant are as follows:

Supplying chilled and hot water for the areas mentioned below:

Main Control building including:

Relay rooms;
Shift engineer rooms;
Sampling room &laboratory;

HVAC machine room

Switchgear rooms

Turbine hall
Fuel oil forwarding pump house
H2 plant
Main cooling system including CW pump house
Main cooling switchgear building

Main & auxiliary boiler houses

Condensing polishing plant (C.P.P) and chemical storage
Battery rooms
Battery charger rooms
Toilets (only hot water supply)
Auxiliary cooling switchgear building

Flue gas desulphurization (FGD) and elect. Precipitator buildings:

- Supplying domestic hot water.

Note:

In case the central chilled and hot water supply plant can not be used for some of the buildings, The DX systems can be used in those buildings based on engineer approval as long as the indoor design conditons (Temprature, humidity, pressurization, minimum ventilation and fresh air, filtration, that are mentioned in this section) shall be met.

For the above areas with limitation for using the central heating and cooling systems; proper HVAC system (A/C, heating/cooling/ventilation; according to the indoor design condition mentioned in table B) should be considered.

The Central Chilled and Hot Water Supply Plant shall comprise of the following main parts:

a) Two 100% capacity packaged automatic and manual control refrigeration chillers including roof mounted air cooled condensers and water chillers with all ancillary equipment for trouble free operation.

b) Chilled water circulating pumps (three 60% capacity)

c) Automatic control for individual rooms

d) Auto-manual control for chillers

e) Hot water supply system consisting of the followings:

- Two 100% capacity hot water boilers dual fuel(gas and gas oil)to warm the water used for all heating purposes.

- Two 100% capacity heat exchangers to warm domestic cold water.

- Hot water circulating pumps for heating and defrost purposes (three 60% capacity).

- Hot water circulating pumps for domestic hot water circuit (three 60% capacity).

- An expansion water tank.

f) Suitable facilities to drain chilled water circuits in winter and hot water circuits in summer.

The Package unit shall comprise of the following main parts:

Each package unit shall comprise but not limited to:

The following components assembled and mounted on a common frame:

Air pre-filter section;
Air filter section;
Direct expansion cooling coil (DX);

Self draining, corrosion resistant condensate pan;
Droplet eliminator;
Electric heating coil for reheat (if necessary);
Hot water coil (if necessary);

Mixing box;
Supply fan driven by electric motor;

Motorized shut-off damper;
Pre-heating coil;
Pre-cooling coil.

The casing of the package unit shall be made of stainless steel 316 and double skin plate panel enclosing thermal and acoustic insulation or equivalent. The intermediate isolating media in 50 mm thick mineral wool, with a glass cloth, is compressed so as to reach a panel thickness of 46 mm (min). Thermal transmittance T4 and Thermal bridging TB3 in accordance with standard EN 1866.

The chassis shall be protected by epoxy painting and fitted with lifting lugs.

The panels shall be set up on air-tight crush resistant gaskets.

Each section shall be fitted with access doors, or removable panels with door handle and locking mechanism for equipment maintenance or removal.

The packaged unit shall be provided with removal lifting eyes, which will not deform when lifting.

Air pre-filter and filter section.

The air pre-filters and filters shall be in accordance with the International standards.

Filters shall have a static pressure drop not exceeding 200 Pa when clean.

Filters shall be selected with a maximum front velocity of 2.5 m/s to insure that particles entrainment dose not occurs.

Air filters section shall comprise disposable panel pre-filters and filter for use in air conditioning plants and package units. Panel’s filters shall be mounted on stainless steel guide rails and be easy removable.

Each filter shall be fitted with a differential manometer fitted with Upstream/downstream pressure measure tubes.

Direct expansion cooling coil (DX).

Coil shall be sized on a maximum air velocity through the face area of 2.8 meters per second.

Direct expansion (DX) cooling coil shall be horizontally split, with multi-row copper tubes with copper fins. Fins shall be mechanically bonded to tubes. DX coil shall be provided with thermostatic expansion valves, refrigerant service valves, filter drier, sight glass, low ambient control, and anti-short-cycle controls. Fins spacing shall be 2.5 mm minimum (10 fins/inch).

The coils shall be protected by HERESITE coating.

A drain pan shall be provided under DX cooling coil, supply and return lines where condensation may occur. The drain pan shall be of stainless steel 316L and shall be water tight.

A removable standard flat cells droplet eliminator or high velocity deflector type eliminator will be installed downstream side of direct expansion coil. This droplet eliminator shall be made of stainless steel 316L and dismountable laterally. Efficiency: 100% at 4 m/s.

Coil and drain pan shall be installed on slide tracks for ease of removal.

The following factors shall be considered for the selection of the cooling dehumidifying coils:

Required capacity + 10% over capacity.
Psychometric conditions of entering air.
Available cooling media and operating temperature.
Coil face air velocity (maximum 2.8 m/s).

Environmental atmosphere.

Electric heating coil.

The electric heating coil shall be provided with outside terminal box, pre-wired electrical components, suitable for control/safety devices such as:

Suitable disconnecting switch.
Contact for interlocking with the supply fan of the network.
Relay for remote alarms.
Manual reset thermal cut-out.
High temperature safety cut-out.

Earthing clamp on the casing and bolt in the terminal for connection or earthing cables.

The electric heating coil shall be designed for 10% over capacity and according to the speed of the air flow on the electric heater. The electric heating coil shall be suitable for installation within low velocity (i.e. less than 4 m/s). Air pressure drop shall not exceed 60Pa at the nominal flow rate.

Heating coil with more than 4KW heating capacity shall be pre-wired for Thristor control. For capacities of less than 4KW, a step controller or a 3 stage thermostat shall be used. Casing shall be made of galvanized steel and shall be air tight.

The electrical heating coil shall be with a double insulation and an integral superheating protection and anti-radiation screens, required for protection of other components.

Hot water coil.

Hot water coil shall be copper plate fins with belled collars bonded to copper tubes by mechanical expansion. Working pressure shall be 12 kg/cm2 at 205c.headers shall have drain and vent connections.

Fined coil containing circulating hot water acts between the hot water flowing inside and the air flowing of outside. Cold air after passing the coil is heated to the point set by temperature controller adjusting a 3 way motorized valve which controls the hot water flow rate. Heated air is then blown into the space through ducts and grilles at the outlet.

Fan section

Fan and motor shall be mounted in a common frame isolated from the casing by vibration isolators. Anti-vibration mounting shall be of fully captive type with at least 95% isolation efficiency.

The fan outlet shall be connected to the casing by a flexible non-combustible connection. Hinged access door shall be provided on a vertical panel of the fan section and shall be airtight.

Fan shall be centrifugal type for constant Volume applications. Fans shall be fitted with anti-sparking protection when required. Fan shall be statically and dynamically balanced and furnished with motor, V-belt drive belts, belt guard, inspection hatch and casing drain.

Fan shaft shall be polished steel, and bearings shall be self-aligning, split pillow block, and grease lubricated spherical roller bearings

Casing and impeller shall be made of galvanized steel with epoxy coating. Shaft shall be made of stainless steel 316L.

Fan shall be selected to meet the Design air flow and static pressure.

Fan motor shall be selected according to:

ambient conditions;
area classification;
fan maximum power plus 20 % spare capacity margin;
to provide the required starting torque;

starting time;
number of starts per hour.

All fans and motors requirements listed in this section apply to supply and exhaust fans.

The fan casing, the motor and the common chassis shall be connected to the earth through a bolt earthed to the frame of the package unit.

Humidifier section

Humidifier shall be jacketed dry steam unit that provide full separation of condensate from steam ahead of the jacketed control valve.

Humidifier shall introduce steam directly into the air stream through a jacketed manifold that prevents condensate from being introduced into the air stream.

Humidifier shall be supplied with a cast iron in-line strainer and a cast iron float and thermostatic or inverted bucket steam trap. The strainer shall have a no-crush screen. Humidifier shall have a cast iron or stainless steel separator to receive steam at operating pressure and remove water droplets and particles when operating at maximum capacity. The separator shall be located ahead of the control valve. A drip leg shall be supplied with the separator and shall be sized according to steam capacity. The drip leg shall be at the bottom of the separator, located ahead of the steam trap.

The control valve shall be stainless steel, steam jacketed, with a parabolic plug. The control valve shall be capable of modulating flow over entire stroke. The control valve operator shall stroke valve over entire range and shall be capable of tight shutoff at the maximum pressure.

Humidifier shall be supplied with internal drying and silencing chambers, jacketed by steam, at atmospheric pressure. The silencing medium shall be stainless steel. Distribution manifolds shall be stainless steel, steam jacketed. The manifold shall be provided with stainless steel silencing screen over entire length. The manifold jacket shall allow condensate to return to the trap.

Equipment shall be provided with the following control devices:

On/off switch.
Low water level switch.
Safety overflow.
Control circuit fuse.
High temperature cut-off.
Proportional regulation.
Pilot lamps: on/off and fault.

Air flow switch and high limit humidistat.

Motor Compressor

Semi-hermetic reciprocating and screw type motor compressors designed to run on 400 Volt, 3 Phase, and 50 Cycle electricity shall be used. The selection of the compressor shall take into account the operation at reduce capacity and shall be at least 10% lower than the limit of use of compressors.

Refrigerant Circuit

Each refrigerant circuit shall complete with insulated suction line and liquid line including filter drier, sight glass, compressor discharge service valve, liquid line, shut-off solenoid valve and refrigerant (R-407C or R-134A) charge. Refrigerant copper lines shall be dehydrated and leak tested.

Thermal Expansion Valve

Thermal expansion valve shall be used for minimizing superheat in the evaporator and allowing packaged unit to run at reduced condensing temperature.

Direct expansion split system unit

Split system direct expansion air conditioning units shall be commercially available units and consist of indoor and outdoor sections connected by refrigerant pipes and shall be factory pre-charged with refrigerant and equipped with quick connecting couplings.

Refrigerant shall be R134A or R407c. This points regarding refrigerant shall be confirmed later according the development of the internal regulations.

Mixing plenum for recirculation of air.

Equipment mounted electrical panel shall enable the following functions:

On/off main switch.
Ventilation fan speed control with 2 speeds minimum.

The indoor section condensate pan shall be connected to a galvanized steel or PVC pipe drain which shall be trapped to a head of at least twice the suction head at the cooling coil.

The outdoor section shall consist of:

Hermetic type compressor with thermal and electrical overload protection.
Air cooled condenser, hermetically sealed and brazed.
Condenser fan directly driven by electric motor.
Factory-wired controls.

Air cooled condenser shall have copper fins and copper tubes. It shall be protected by here site or similar coating, marine quality or equal and approved epoxy coating shall be applied on tubes, fins and frame to protect its against corrosive air. Coating must be applied by the equipment manufacture in their workshop. Specification and system of coating shall be submitted subject to client approval.

Spacing between fins shall be never less than 2.5 mm (10 fins/inch).

The outdoor section controls shall include high and low pressure switches, compressor overload devices, transformer and timer to prevent compressors from short-cycling.

Note:

All D.X Systems (Package unit, Split Unit.) shall be protected against outdoor climate condition.

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Bandar abbas steam power plant project (4x350 mw)

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