Aiming at solving the problem of low reheat steam temperature at medium and low load in a supercritical once-through tower boiler

the low load reheat steam temperature adjustment test was carried out

and the reason for low reheat steam temperature at medium and low load was analyzed. The overall plan for joint treatment of stable combustion burner transformation

heating surface transformation and boiler operation optimization was proposed. After the implementation of the overall plan

the reheat steam temperature of the boiler at medium and low loads significantly increased. The outlet temperature of the reheat steam increased from 537.9 ℃ to 563.9 ℃under 40% BRL condition

and from 537.9 ℃ to 559.4 ℃ under 50% BRL condition

and the coal consumption of power supply of the unit under these two conditions reduced by 1.64 g/(kW·h) and 1.36 g/(kW·h) respectively

and the total annual saving of boiler fuel cost was about 1.25 million yuan. Under 30%BRL condition(the boiler's deep peak load regulation)

the outlet temperature of reheat steam can increase from 541.6 ℃ to 560.9 ℃

with an increase of 19.3 ℃

and the outlet temperature of the superheated steam can increase from 560.8 ℃ to 571.9 ℃

with an increase of 11.1 ℃.