In order to solve the safety and economic issues of mixed combustion of multiple fuels such as gas

lignite

and coal slurry in power plant boilers

an evaluation method for the blending of multiple fuels was proposed.Firstly the constraints on the moisture

volatile matter

calorific value

and sulfur content of the fuel entering the furnace under different loads are established

based on the fuel characteristics and various requirements for safe operation of the unit

and then the minimum comprehensive power supply cost and the optimal blending scheme for multiple fuels under different loads are determined through blending experiments. The experiments were conducted on a 300 MW power plant boiler

and the results showed that

on the premise of meeting the constraints of the incoming fuel

the fuel cost for power plants can be decreased by increasing the proportion of economic coal blending based on the principle of minimizing comprehensive power supply costs. This study will provide important reference for the study of multi fuel blending in power plant boilers.