Laying structure of heat tracing element of nuclear power plant boron heat tracing system
A nuclear power plant and heating element technology, which is applied in nuclear power plant auxiliary equipment, nuclear power generation, heat measurement, etc., can solve the problems of frequent start and stop of heating cables, non-standard and inconsistent laying of heating elements, etc.
Pending Publication Date: 2021-01-15
CNNC FUJIAN FUQING NUCLEAR POWER
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Problems solved by technology
[0003] At present, the boron heat tracing system of nuclear power plants has many defects due to the non-standard laying of some heat tracing elements.
If the normal loop thermocouple is close to the heating cable, it will cause the main control and the local temperature display to be inconsistent; the temperature switch capillary is too close to the heating cable, which will cause the heating cable to start and stop frequently; the thermocouple and the temperature switch capillary The position of the distance from the heating cable is inconsistent, which will cause the problem that the temperature display is not synchronized with the start and stop of the heating cable
Method used
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[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Boron heat tracing systems are designed with two identical heat tracing circuits, divided into normal and backup circuits. Each heating circuit includes a heating cable, a temperature switch, and a temperature measuring thermocouple. The normal loop thermocouple sends the temperature signal to the main control display, and the backup loop thermocouple sends the temperature signal to the local temperature indicator box for display.
[0024] like figure 1 In the laying structure of the heat tracing elements of the boron heat tracing system of a nuclear power plant shown, a normal circuit heat tracing cable 2 is arranged along the axis on the side wall of the process pipe 3, and its position is defined as the circumferential direction 0 of the process pipe 3 ° position.
[0025] A backup circuit heat tracing cable 7 is arranged...
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Abstract
The invention relates to the technical field of nuclear power plant boron heat tracing system temperature probe installation, and particularly discloses a laying structure of a heat tracing element ofa nuclear power plant boron heat tracing system. A normal loop heat tracing cable is arranged on the side wall of a process pipeline along the axis, and the position of the normal loop heat tracing cable is defined as the circumferential 0-degree position of the process pipeline; a standby loop heat tracing cable is arranged at a 180-degree position in the circumferential direction of the processpipeline; and a normal loop temperature switch capillary tube and a normal loop thermocouple are arranged at the 90-degree position in the circumferential direction of the process pipeline, and a standby loop thermocouple and a standby loop temperature switch capillary tube are arranged at the 270-degree position in the circumferential direction of the process pipeline. The laying of the thermocouple, the temperature switch and the heat tracing cable of the boron heat tracing system of the nuclear power plant is standardized, and the problems that main control and local temperature display are inconsistent, the heat tracing cable is started and stopped frequently, and temperature display and heat tracing cable starting and stopping are not synchronous due to nonstandard installation are solved.
Description
technical field [0001] The invention belongs to the technical field of installing a temperature probe of a boron heat tracing system of a nuclear power plant, and in particular relates to a laying structure of a heat tracing element of a boron heat tracing system of a nuclear power plant. Background technique [0002] The boron heat tracing system provides heat tracing for the pipes and equipment that the boric acid solution flows through in the nuclear power plant to prevent the boric acid solution from clogging the pipes and equipment due to low temperature crystallization, thereby maintaining the normal circulation of the fluid and ensuring the safe and stable operation of the unit. [0003] At present, the boron heat tracing system of nuclear power plants has many defects due to irregular laying of some heat tracing elements. If the normal loop thermocouple is close to the heating cable, it will cause the main control and the local temperature display to be inconsistent;...
Claims
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Login to View More IPC IPC(8): G21D1/02G01K1/14
CPCG01K1/14G21D1/02Y02E30/00
Inventor 刘政黄宇航王五妹郑孝珠季诚刘建忠魏祖荣薛广彬张琼瑶潘文静
Owner CNNC FUJIAN FUQING NUCLEAR POWER