Abstract:

In order to achieve the cost-efficient operation and energy saving of the combined heat and power （CHP） plant in the multi-source heating system, and make the coal blending results more scientific and practical, heat load distribution and coal mixture burning process were integrated into one system to carry out the research of coal dirstirbution. The heat supply and power generation of the CHP plant and the peak-shaving boiler were used as the input boundary conditions of the coal blending optimization model. Considering the uncertainty of interval caused by coal quality fluctuation, and taking the coal blending of the CHP plant and the peak-shaving boiler in an economic development zone of a North China metropolis as an example, uncertainty optimization model for combination system of CHP plant and peak-shaving boiler were established under “Power Determined by Heat”, which was solved with using interactive interval algorithm. The results show that this model can not only meet the requirements of heating and power generation, unit equipments and environmental protection, but also can control the cost of coal blending in a reasonable range. The quality of blended coal optimized with the model is stable, and it can provide reasonable coordination scheme of emission reduction and coal blending economic cost for the relative decision makers according to the actual situation, in different optimized interval of blended coal types.

Key words: combined heat and power plant, coal blending, uncertainty, interval programming, heat supply