Energy efficiency measures - Industrial - Heating system - Makeup water - Preheating
Template assignment
Base Case
Proposed case
Template assignment
Base Case
- Natural gas fired boiler provides steam to a process
- Boiler makeup water preheated using boiler blowdown and heated up to 110 ºC in the deaerator using steam, boiler seasonal efficiency is 81.4%
- Combustion gas at 185 ºC is rejected to the atmosphere
- Process steam flow required is 11,360 kg/h during 6,000 h/yr
- Steam pressure is 960 kPa at saturated temperature of 178 ºC
- Condensate temperature is 71 ºC, 56% return
- Makeup water temperature is 10 ºC
- Natural gas rate is $8.03/GJ
Proposed case
- Install a condensing economizer on boiler stack to preheat boiler makeup water. This will reduce the steam usage in the deaerator; therefore, increasing the steam boiler seasonal efficiency from 81.4 to 87%
- Cost of retrofit is $200,000
Base case
Proposed case
Solution
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
