Steam merging method used for two-on-one gas-steam combined cycle unit

Abstract

The invention relates to a two-on-one gas-steam combined cycle unit, in particular to a steam merging method used for the two-on-one gas-steam combined cycle unit. The method solves the problems that an existing steam merging method causes high energy consumption in the unit starting process, causes low load response speed of the unit, and affects safe and stable operation of the unit. The steam merging method used for the two-on-one gas-steam combined cycle unit comprises the following steps that firstly, steam merging conditions of the unit are set, and the steam merging conditions comprise that 1), the temperature deviation of high-pressure main steam is less than or equal to 15 DEG C, and the pressure deviation of the high-pressure main steam is less than or equal to 0.1 MPa; 2), the temperature deviation of medium-pressure main steam is smaller than or equal to 80 DEG C, and the pressure deviation of the medium-pressure main steam is smaller than or equal to 0.1 MPa; 3), the temperature deviation of low-pressure main steam is smaller than or equal to 80 DEG C, and the pressure deviation of the low-pressure main steam is smaller than or equal to 0.05 MPa, and 4), the loads of two gas turbines are both 150 MW; and when the unit meets the steam merging condition, steam merging is started. The method is suitable for the two-on-one gas-steam combined cycle unit.

Description

technical field [0001] The invention relates to a two-to-one gas-steam combined cycle unit, in particular to a steam paralleling method for a two-to-one gas-steam combined cycle unit. Background technique [0002] As an advanced generator set, the two-to-one gas-steam combined cycle unit is widely used in the power production industry. In the start-up process of the two-to-one gas-steam combined cycle unit, steam paralleling is an indispensable link. Under the existing technical conditions, the steam paralleling of the two-to-one gas-steam combined cycle unit is operated in the order of medium pressure, high pressure and low pressure. However, the existing steam paralleling method has the following problems due to the limitations of its own principles: First, because the steam paralleling process takes a long time (usually up to 50 minutes), the energy consumption during the start-up of the unit is relatively high. Second, due to the large axial displacement changes of the...

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Problems solved by technology

[0003] In order to solve the problem of high energy consumption during the start-up process of the unit caused by the existing steam combination method, the slow load response speed of the unit, and the influence on the safe and stable operation of the unit, the present invention provides a two-to-one gas-steam Combining Steam Method of Combined Cycle Unit

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