An automatic pipe warming method for steam pipes in thermal systems

Abstract

The invention discloses an automatic pipe warming method for the steam pipeline of a thermodynamic system. The method includes the following steps that: 1) the steam trap of a controlled steam pipeline is opened; 2) opening degree y is determined, a control instruction is sent out so as to make the opening degree of a steam intake valve of the controlled steam pipeline increased by the opening degree y; 3) time t is determined, waiting is carried out for time t; 4) whether a pipe warming completion condition of the controlled steam pipeline is satisfied is judged, if the pipe warming completion condition of the controlled steam pipeline is satisfied, the method is terminated and quits, otherwise, the method skips to execute step 5); and 5) whether the outlet temperature change rate x of the controlled steam pipeline satisfies a preset excessive quickness judgment condition, if the outlet temperature change rate x of the controlled steam pipeline satisfies the preset excessive quickness judgment condition, the method skips to execute step 4), otherwise, the method skips to execute step 2). With the automatic pipe warming method for the steam pipeline of the thermodynamic system of the invention adopted, the steam intake valve and the steam trap of the steam pipeline can be automatically controlled, so that proper pipe warming speed can be ensured, and the safe and economic performance of the thermodynamic system in the pipe warming period of the steam pipeline can be improved, and the labor intensity of operation personnel can be reduced practically.

Description

technical field [0001] The invention relates to the field of thermal system control, in particular to an automatic pipe warming method for steam pipes in a thermal system. Background technique [0002] In thermal power, nuclear power and other thermal power systems, many steam pipes are included. During the system start-up process, it is generally necessary to warm up these steam pipes first to ensure that the pipe metal expands evenly during the heating process and prevent cracks and deformation. At present, the heating pipe of the steam pipeline is generally controlled manually, and the operator manually controls the steam pipeline drain valve, and gradually opens the large steam pipeline inlet valve according to experience. However, the steam pipe heating process is affected by many factors such as the length of the steam pipe, the thickness of the pipe wall, the pipe diameter, the material of the pipe, and the steam parameters. Because heating the pipe too quickly may ...

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Problems solved by technology

However, the steam pipe heating process is affected by many factors such as the length of the steam pipe, pipe wall thickness, pipe diameter, pipe material, and steam parameters. The experience of operating personnel is difficult to apply to all pipes, which often leads to too fast or too slow heating.

Because heating the pipe too quickly may damage the steam pipe, and heating the pipe too slowly will cause the system to start up too long, so the current method of manually controlling the heating of the steam pipe not only makes the operating personnel labor-intensive, but also affects the safety and economy of the thermal system. performance is adversely affected

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