HOT WATER HEAT RECOVERY (HRSG)
HOT WATER HEAT RECOVERY (HRSG)
(OP)
Dear sir,
I want to produce hot water using a HRSG. The HRSG should increase the temprature of water from 50C to 160C. The flow rate of needed water is high (about 1500~2000 ton/hr).
Can I use a Heat Exchanger like economiser in HRSG? In the other hand, I want to use a HRSG that produces hot water. Is it impossible and how can we control water outlet temprature?and if not, What is the method for obtaining this target?
I want to produce hot water using a HRSG. The HRSG should increase the temprature of water from 50C to 160C. The flow rate of needed water is high (about 1500~2000 ton/hr).
Can I use a Heat Exchanger like economiser in HRSG? In the other hand, I want to use a HRSG that produces hot water. Is it impossible and how can we control water outlet temprature?and if not, What is the method for obtaining this target?





RE: HOT WATER HEAT RECOVERY (HRSG)
If in he US, you have to convert your unit controls according with the Jurisdiction.
you will need an experienced hot water specialist to accomplish the task.
In order to control hot water temp you will have to have storage capacity whether in line or strage tank.
genb
RE: HOT WATER HEAT RECOVERY (HRSG)
For the controls, if you need precise control use some digitally activated control or might be try throttling hot water with cold water to optimise the temperature.
RE: HOT WATER HEAT RECOVERY (HRSG)
thanks for your reply. this hot water should produce in HRSG. it means we dont produce steam in HRSG.but the most problem is that the inlet water temperature is very low and gas turbine fuel in GASOIL with high sulfure therefore we have acid dewpoint(~120 c) corrosion.we wanted to use a simple gas to water heat exchanger (as a HRSG) but we dont know what should we do with corrosion?
RE: HOT WATER HEAT RECOVERY (HRSG)
to control the temperature by water flow (t/hr) for the same amout of heat tranfer.
RE: HOT WATER HEAT RECOVERY (HRSG)
For the cold end tubes, the parrallel flow section would be designed with the desing exhasut gas temp to be 120 C, and the water temp leaving that last cold end row as perhaps 105 C. The parrellel flow section would then be desinged to heat the water from 50-105 C. A simple ehat balance would yied the expected gas temp entering the parrallel flow section.
Another desing issue is that it will be neccesary to maintain the water pressure above the pressure that would cause the fluid to boil. The HX flow control valve would then be located at the outlet of the HX, and a safety relief valve installed upstream of that outlet valve.
RE: HOT WATER HEAT RECOVERY (HRSG)
it is common on condensing W boilers
genb