In order to grasp the change rules of operating economy of the unit running within the full load range

on the basis of an ultra-supercritical 600 MW coal-fired unit

this paper studied the degree and characteristics of the influence of different coal types on the unit's comprehensive operating conditions. Moreover

the consistency of the unit performance test results with the energy consumption in actual operating state was analyzed. The results show that

in the full operating load range

the load rate has a far greater influence on the heat consumption rate than the plant power rate and the boiler thermal efficiency. The load rate affects the boiler thermal efficiency to the least extent. The increase in the heat consumption rate is the main reason for economy decline of the unit under deep peak regulation. In deep peak regulation state

compared with burning test coal MZ03

burning MZ01 not only leads to higher low-load stable combustion performance of the boiler and operating safety of the pulverizing system

but also has a higher boiler thermal efficiency(by 1.51%) and lower coal consumption rate for power supply(by 5.2 g/(kW·h)) at 180 MW. Comprehensively considering the thermal efficiency of boiler under dynamic and static conditions

the change in the power consumption rate of the plant and the energy consumption of steam soot blowing

with a daily average electrical load of 420 MW

the actual operating coal consumption is at least 1.7 g/(kW·h) higher than the experimental coal consumption. This is undoubtedly one of the reasons why the positive and negative coal consumption is difficult to match.