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FORBES MARSHALL

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FORBES MARSHALL

Blowdown Heat Recovery Units

Pune



A Quality Product from
FORBES MARSHALL [View Profile]
Pune - India

Description :
The Blowdown Heat Recovery System comprises of:
- Blowdown Flash Vessel
- SS Heat Exchanger
- Flash Steam Distributor
- Ball Float Trap at water outlet of Flash Vessel
- Thermostat and Circulation Pump for Soft Water

Steam boilers need to be blown down to control the level of total dissolved solids (TDS) in the boiler water. This is best achieved by using a TDS control system which will open a valve to allow boiler water to discharge when the TDS level rises above a pre-set limit. Relatively low TDS feedwater then replaces the discharged boiler water.
Upto 80% of the heat in this discharged boiler water can be recovered with a properly designed heat recovery system.

How the system works :
Flash steam is released from the hot blowdown water when the pressure drops after the TDS blowdown control valve. This mixture of flash steam and blowdown water is allowed to separate in the flash vessel. The design of the vessel ensures that flow velocities are low to promote good separation. The dry flash steam is then introduced, at low pressure, into the feedwater storage tank through the steam distributor or the flash condensing deaerator head. A float trap fitted to the outlet of the flash vessel drains the residual blowdown water.
From the float trap, the residual blowdown water which is still hot at this point, is allowed to pass into the heat exchanger where it gives up its heat to the circulating cold make-up water. The cooled blowdown water then flows safely to drain. To conserve energy, the circulating pump is activated by a thermostat mounted on the blowdown water inlet to the heat exchanger. It will therefore only run when blowdown water is flowing.

User benefits :
? Can recover upto 80% of the heat from blowdown
? Reduces expensive treated make-up water by recovering flash steam
? Rapid pay-back time from complete system package
? Flash vessel designed and constructed to BS 5500 Category 3 for enhanced safety
? Stainless steel heat exchanger plates can be removed for examination without disturbing pipework
? Reduces temperature of blowdown water for safer disposal

Blowdown Flash Vessel :
Blowdown Flash Vessel is a specially designed vessel for handling blowdown water at required pressure and temperature. The design ensures easy separation of flash steam at low velocities. It has accessories such as Safety Valves, Pressure Gauges, Disc Check Type NRV at Flash Steam Outlet and Ball Float Trap at the outlet of blowdown water. Ball Float Trap ensures that no flash steam goes to the heat exchanger and maintains the pressure balance. All components are properly sized depending on the blowdown parameters. Blowdown flash vessel is manufactured to specifications of Indian Boiler''s Regulation (IBR) Act with IBR certification.

SS Heat Exchanger is part of the system meant to use the heat from blowdown water coming out of Flash Vessel and pre-heat the soft water going to the feedwater tank.

Flash steam from the Flash Vessel is taken to the Flash Steam Distributor fitted at the end of flash line inside the feed water tank. Flash distributor mixes the flash steam evenly and heats the feed water in the tank.

Thermostat and soft water circulation pump detects the flow of blowdown water and starts the circulation of soft water in the Heat Exchanger.


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FORBES MARSHALL

Manufacturer & Exporter of Turnkey solutions for Process Industries, Steam &, Water Analysis Systems, Gas Analysis Solutions. Products, Water Quality Analysers &, Recorders, Distributed Control systems, I/P Convertors, Pressure &, Temperature Gauges and Recorders. Boiler Efficiency Monitoring System, Oxygen Analysers, Steam Generation and Distribution Packages, Forbes Marshall Systems, Thermocompressors, High Pressure Stop Valves, Forbes Marshall Services, Piston Valves, I/P Transducers, Controllers, Steam and Water Analysis System, Flow Meter, Control Valves, pH & Conductivity Analyzers.



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