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Abstract
High moisture content of municipal solid waste (MSW) decreases the efficiency of power plant firing MSW directly. The MSW power system integrated with an external steam dryer and waste heat recovery system (WHRS) is proposed to enhance the MSW power plant (MSWP) efficiency. A reference case study with a 12 MW MSWP is carried out. The efficiency of MSWP integrated with a steam dryer can be enhanced by 1.07 percentage points (%-pts) and 0.36%-pts with 0.21 and 1.13 MPa steam extraction, respectively, as dryer heating source at a dryness degree of 0.25. Furthermore, when the WHRS is integrated, the power plant efficiency is enhanced by 1.79%-pts and 1.08%-pts. Then, economic analysis is carried out, and results show that the MSWP can bring profits with the integration of a steam dryer with steam 1.13 MPa steam as heat source at rated degree of dryness.
Nomenclature
Abbreviation
| AAP | = | additional air preheater |
| COND | = | condenser |
| CP | = | condensate pump |
| DE | = | deaerator |
| ECO | = | economizer |
| EVA | = | evaporator |
| FP | = | feedwater pump |
| Gen | = | generator |
| HTAP | = | high temperature air preheater |
| HPH | = | high pressure heater |
| LPH | = | Low pressure heater |
| LTAP | = | low temperature air preheater |
| LTE | = | low temperature economizer |
| MSW | = | municipal solid waste |
| MSWP | = | conventional MSW power plant |
| MSWPD | = | MSW power plant integrated dryer |
| MSWPDR | = | MSW power plant integrated dryer and waste heat recovery system |
| NPV | = | net present value |
| SC | = | shaft seal cooler |
| SH | = | superheater |
| WHRS | = | waste heat recovery system |
| pts | = | points |
| %-pts | = | percentage points |
Symbol
| h | = | enthalpy, kJ·kg−1 |
| H | = | hydrogen |
| I | = | discount rate |
| m | = | mass, kg |
| P | = | pressure, MPa |
| s | = | entropy, kJ·kg−1·K−1 |
| T | = | temperature, K |
Subscript
| ar | = | as received basis |
| b | = | boiler |
| ex | = | exergy |
| d | = | dried |
| ph | = | physical |
| sat | = | saturated |
| sur | = | surrounding |
| t | = | turbine |
| w | = | water |
Disclosure statement
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.