| Author | Pisak Udomwong |
| Call Number | AIT RSPR no. ET-92-5 |
| Subject(s) | Soap factories--Energy conservation
|
| Note | A research study (12 credits) submitted in partial fulfillment of the requirement for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. ET-92-5 |
| Abstract | Energy conservation opportunities were investigated in a soap and glycerine plant, named Rubia Industries Co.,Ltd. The average steam and electricity consumptions were audited to be 4.53 ton/hr and 503 kW respectively. Energy analysis of the existing boiler were used to identified the locations, types, and magnitudes of the losses. The result showed that the 16t law efficiency of the boiler varies between 77.8 and 83.0 %. The major loss was the energy releasing with flue gas, representing about 16 % of total energy input to the boiler. In addition, it was found that significant amount of condensate after the processes was drained out without any heat recovery. The feasibility of preheating the combustion air with the flue gas was then studied. Based on technical information and expected expenditure savings, the concept of maximum allowable investment cost was used to justify an air pre-heater installation. In order to avoid the contamination problem, the heat recovery from condensate return was investigated by the use of a heat exchanger instead of direct mixing with the make up water. A design procedw-e was developed to find the optimum size of a heat exchanger that gives a maximum present worth of its whole life cycle. The heat exchanger with an effectiveness of 0.978 obtained from the design showed a very attractive rate of retum and pay-back period of the investment at 160 % and 8 months respectively. Finally, a back pressw-e steam tw-bine cogeneration system for producing both steam and electricity for the plant was assessed. The cost analysis based on the exergy concept was used to justify the system. The result showed that the cogeneration system with a boiler producing steam at 50 bar and 400 C was economical and suitable for the plant. The electricity generated from this system costs about 1.46 Baht/kWh which is cheaper than electricity purchasing from the utility at a cost of 1.53 Baht/kWh if the system operates at the existing average steam load requirement of 4.53 ton/hr. |
| Year | 1992 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. ET-92-5 |
| Type | Research Study Project Report (RSPR) |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Supachart Chungpaibulpatana |
| Examination Committee(s) | Wibulswas, Frida;Bhattacharya, S.C. |
| Scholarship Donor(s) | Government of Denmark. |
| Degree | Research Studies Project Report (M.B.A.) - Asian Institute of Technology, 1992 |