A comprehensive setting method for a hybrid steam distribution function of a turboset

Abstract

The invention discloses a comprehensive setting method for a hybrid steam distribution function of a turboset. The method follows a steam distribution principle of set valve sequence value mapping. On-site setting of the mixed type steam distribution function is completed through comprehensive application and implementation of multiple methods such as a reverse synonym method, a sequential steam distribution method, a reverse mapping method, a valve position synonym method and a local setting method according to the sequential order of a pre-setting sequence valve and a subsequent setting single valve and according to the structural characteristics of a hybrid steam distribution configuration, and the setting quality and the setting efficiency are effectively improved. The methods are comprehensively applied and implemented, the congenital defects of a mixed type steam distribution configuration structure are eliminated; The non-linear correction of the flow characteristics of the single valve and the sequence valve are considered, the problems that the setting work difficulty is high, the efficiency is low, and many accurate interference links exist are solved, and positive significance is achieved for improving the inlet steam flow control precision of the hybrid steam distribution unit and improving the on-site setting and implementation efficiency.

Description

technical field [0001] The invention relates to a comprehensive setting method for a hybrid steam distribution function of a steam turbine unit, which belongs to the technical field of the steam turbine unit. Background technique [0002] The high-pressure regulating valve of the steam turbine belongs to the "quick opening" regulating valve, and its regulating valve flow characteristic (characterized as the functional relationship between the valve position command and the percentage of inlet steam flow) has typical nonlinear characteristics. This nonlinear characteristic is not only closely related to the structure of the high-pressure regulating valve (including the pre-opening valve), the full-stroke displacement of the valve stem, and the flow structure of the steam turbine, but also is affected by the operating conditions. The valve opening sequence is different, and the numerical representation function of its flow characteristics is also different. The steam distribu...

AI Technical Summary

Problems solved by technology

However, in the actual implementation process, because the physical meaning of the intermediate function is not clear and the structure is complex, there are many links that interfere with the accuracy, the on-site setting and implementation are difficult, and the accuracy is not high

On the one hand, as far as the function module structure is concerned, the valve flow characteristic function F(X4) is often a common module of the steam distribution configuration of the single valve mode and the sequential valve mode, which is contrary to the principle of steam distribution following the established valve sequence value mapping, and is The congenital defect of the hybrid steam distribution function configuration structure; on the other hand, in the implementation process of the conventional steam distribution function setting, the single-valve flow correction function F(X3) of each control valve is based on the total critical value when all the control valves are fully open. The flow rate is per unit value, which is converted from the back pressure correction function F(X1) of the sequence valve. In this way, the function F(X3) of each regulating valve is exactly the same; at the same time, the flow opening function F(X4) of the regulating valve is generally determined by a single The control valve is obtained from the full stroke flow characteristic test of the other control valves in the fully open state, without considering the influence of the actual valve sequence of the control valve

In this way, two factors make it impossible to have both the flow linear correction of the single valve method and the sequence valve method

Images