A method for starting a combined cycle unit

Abstract

The invention discloses a starting method of a combined cycle unit. The combined cycle unit mainly comprises two Siemens combustion engine generators, two waste heat boilers, a steam turbine generator and three main transformers. Firstly combustion engines are ignited so as to cooperate with boiler heating; when the main steam parameters meet the conditions that the pressure ranges from 2.4 MPa to 2.6 MPa, the temperature ranges from 320 DEG C to 350 DEG C and the main steam superheat degree is greater than 56 DEG C, the steam turbine generator prepares impulse starting, gets latched and fully heats the combustion engines, the boilers prepare warming and pressurizing, the quality of steam water is monitored in the warming and pressurizing process of the boilers, sewage discharge is carried out, speed increase is carried out after combustion engine heating is completed, a main oil pump is switched after the constant speed of the unit is stabilized, and various service tests are carried out. According to the starting method of the combined cycle unit, various operation modes of combined cycle of the combustion engines, the waste heat boilers and a steam turbine can be realized, the one-driving-one operation mode, the two-driving-one operation mode and then the one-driving-one operation mode can be realized on the condition without stopping the combustion engines, and the adjustment period can be shortened. According to the starting method, the starting time of combined cycle is shortened, and the starting steps are simplified.

Description

technical field [0001] The invention relates to the technical field of power plants, in particular to a new starting method for a combined cycle unit. Background technique [0002] The combined cycle generator set consists of two 60HZ Siemens gas turbine generators, two waste heat boilers, one 60HZ steam turbine generator and three main transformers. The exhaust gas temperature of the gas turbine is high, and the pressure and temperature rise of the waste heat boiler are fast. Traditionally, the gas turbine and the steam turbine are controlled separately. The start-up time of the unit is long, the start-up steps are cumbersome, and a large amount of waste heat from the boiler is wasted, which is not fully utilized and causes environmental pollution. . Contents of the invention [0003] In order to overcome the above-mentioned technical problems, the present invention provides a method to realize the start-up of the gas turbine-waste heat boiler by adjusting and controllin...

AI Technical Summary

Problems solved by technology

The exhaust gas temperature of the gas turbine is high, and the pressure and temperature rise of the waste heat boiler are fast. Traditionally, the gas turbine and the steam turbine are controlled separately. The start-up time of the unit is long, the start-up steps are cumbersome, and a large amount of waste heat from the boiler is wasted, which is not fully utilized and causes environmental pollution.