Integrated gasification combined cycle (IGCC) power station automatic generating control-based setting

Abstract

The invention discloses an integrated gasification combined cycle (IGCC) power station automatic generating control-based setting, and specifically relates to the field of integrated gasification combined cycle power generation. The setting includes the following operation steps: S1. a power coordinated control mode of a unit is changed into main control of gasification power, and a pressure of agas turbine is adjusted in a following manner, i.e. a boiler is adjusted first, and a steam turbine is adjusted subsequently; S2. an automatic generation control (AGC) instruction changes, the load ofa gasifier is adjusted by power zero-difference main control of the gasifier and oxygen production of air separation is adjusted. The IGCC power station automatic generating control-based setting applies an optimized control mode and a following method of the pressure of the gas turbine, thus when the AGC instruction changes, the load of the gasifier is adjusted by the power zero-difference maincontrol, the oxygen production of air separation is adjusted, the change in the load of the gasifier results in change of the pressure of a synthetic gas, and the gas turbine controls the turottle pressure at 2.5 MPa by adjusting the load, thus the power of the unit is controlled while the pressure of the synthetic gas before the steam valve of the gas turbine is stable. The control method greatlythe improves the stable operation ability of the unit.

Description

technical field [0001] The invention relates to the technical field of coal gasification combined cycle power generation, and more specifically, the invention relates to a method for setting automatic power generation control based on an IGCC power station. Background technique [0002] The automatic power generation control of the IGCC power station is mainly determined by the coordinated control mode of the unit. The original control mode is the gas turbine power master control, the gasifier pressure follows, and the unit power generation command (AGC command) sent by the grid dispatcher subtracts the current actual power of the turbine. As the feed-forward link of the main control of gas turbine power, the gas turbine adjusts the load of the unit according to the AGC command. When the power of the gas turbine rises and falls, the pressure of the syngas will fluctuate accordingly. At this time, the pressure of the gasifier is followed to change the gasification The furnace...

AI Technical Summary

Problems solved by technology

[0004] 1. In practical applications, due to the load adjustment of the gas turbine, the syngas pressure before the gas turbine fluctuates, and the gasifier pressure control time constant is relatively large, and the gasifier needs a long time to complete the pressure adjustment process. The IGCC unit has strict requirements on the synthesis gas pressure. When the total load of the unit changes greatly, it is easy to cause the synthesis gas pressure in front of the gas turbine to be too low, causing the gas turbine to trip

[0005] 2. The original control technology underestimated the fluctuation of syngas pressure caused by the change of gas turbine power, and the rate of change of gas turbine power was set too high, which easily caused large fluctuations in syngas pressure

[0006] 3. In summer conditions, the load of the gas turbine is greatly affected by the ambient temperature. The original control technology did not take into account the limited load of the gas turbine after the IGV angle of the gas turbine reaches the maximum under summer conditions. At this time, the total load command of the unit If it continues to rise, it will cause the main control PID integral saturation of the gas turbine, causing a large lag and seriously affecting the stable operation of the unit

Images