Establishing a model that can reflect the working state of economizer has become a necessary part of boiler modeling. Based on the energy conservation and the mass conservation

by applying the system dynamics principle to the economizer

the system dynamics model of the economizer is proposed in the forms of the causal loop diagrams and the stock and flow diagrams

which are implemented on the Vensim software. Through production examples

the simulation study of the model is carried out

and the proposed model's effectiveness and feasibility are verified. The coal economizer-modeling scheme based on system dynamics provides a new way for modeling coal economizer

and also provides soft sensing method for some difficult physical quantities in engineering.