Guide: The boiler and the steam turbine generator set are started at the same time. While the boiler is ignited and boosted, the steam turbine uses the low-parameter superheated steam of the boiler to warm up and carry load. Because the steam turbine generator set starts to warm up when the parameters such as steam temperature and steam pressure are constantly changing. Speed up. Grid-connected and undertaking a small amount of load, it is called sliding parameter start, also called complete set or unit start.

　　The boiler and the steam turbine generator set are started at the same time. While the boiler is ignited and boosted, the steam turbine uses the low-parameter superheated steam of the boiler to warm up and carry load. Because the steam turbine generator set starts to warm up when the parameters such as steam temperature and steam pressure are constantly changing. Speed ​​up. Grid-connected and undertaking a small amount of load, it is called sliding parameter start, also called complete set or unit start. Its advantages are many:

　　(1) Compared with the independent start of the furnace and the furnace, the time required from start-up to full load of the unit is greatly reduced. The time required to start the boiler and the boiler separately is the sum of the time required to start the boiler and the steam turbine separately. The time required for the sliding parameter start is roughly the same as the time required for the steam turbine to start alone, or even shorter.

　　(2) Since the low-parameter exhaust steam at the outlet of the superheater at the beginning of the boiler startup is used to warm up the engine and carry partial load, the heat and working fluid loss caused by the exhaust steam is recovered.

　　(3) Heating the pipes with steam with lower temperature and pressure will produce much less thermal stress than heating pipes with steam with higher temperature and pressure.

　　(4) When starting alone, since there is no steam cooling in the superheater at the beginning of the ignition, in order to prevent the superheater from burning out, the amount of fuel entering the boiler must be limited. In the case of sliding parameter start, the vacuum in the condenser is used to start the steam cooling in the superheater, and the ignition speed can be significantly increased. At low pressure, the steam volume flow in the superheater is very large, and the superheater tube will not generate heat due to the small exhaust flow (about 15%-20% of the rated evaporation capacity) and uneven flow as when it is started separately. deviation.

　　(5) When starting with sliding parameters, the start of the boiler should meet the requirements of the warm-up speed of the steam turbine, because the time required for the start of the steam turbine is sufficient for the boiler. The boiler can adjust the combustion intensity (that is, control the amount of fuel entering the furnace) to control the starting conditions. When the sliding parameter starts, due to the large volume flow of steam, it is beneficial to improve the water circulation and the temperature difference between the upper and lower walls of the steam drum.