Pre-starting-valve-free steam turbine adjusting method for achieving high and medium pressure combined starting

The invention relates to a method for adjusting a steam turbine without a pre-start valve for realizing combined start of high and medium pressure, which is characterized by comprising the following steps of: setting impulse parameters as follows: the main steam pressure is 4.0 MPa/380 DEG C, the reheat steam pressure is 0.2 MPa/360 DEG C, and a grinding group is additionally arranged in front of a net to increase the main steam pressure to 6.0 MPa; before startup, checking that the cylinder is complete in heat preservation and free of falling or disengaging phenomena, ensuring smooth drainage of a steam turbine body, a main steam pipeline, a reheat steam pipeline and each section of steam extraction pipeline, enhancing monitoring of steam temperature of each section of steam extraction, wall temperature of upper and lower metal pipes of the steam extraction pipeline and temperature difference of upper and lower cylinders of the cylinder, and preventing water from entering the steam turbine; in the starting p