Nuclear power plant evaporator water level control system and method
A water level control and evaporator technology, which is applied in control/regulation systems, liquid level control, non-electric variable control, etc. The effect of preventing transients or automatic reactor shutdown
Pending Publication Date: 2021-11-30
CHINA GENERAL NUCLEAR POWER OPERATION +2
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
According to statistics, the number of automatic shutdowns of nuclear power units caused by abnormal evaporator water level control systems at home and abroad is too numerous to enumerate.
Due to the deviation of the Venturi tube measurement, in the case of low flow, the feed water flow measurement does not follow (that is, it does not reflect the change of the real flow), resulting in large fluctuations in the water level adjustment of the evaporator. This is a common problem of multi-base nuclear power units. , there have been reflections of different situations in nuclear power units in different bases
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that "front", "rear", "upper", "lower", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is constructed and operated in a specific orientation, It is only for the convenience of describing the technical solution, but does not indicate that the referred device or element must have a specific orientation, so it should not be construed as a limitation of the present invention.
[0032] It should also be noted that terms such as "installation", "connection", ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a nuclear power plant evaporator water level control system and method. The water level control system comprises an evaporator, a large valve and a small valve, wherein the large valve and the small valve are arranged side by side and connected to an evaporator water supply main tube, and a Venturi tube and a pore plate are installed on the water supply main tube; at least three feed water flow transmitters are respectively mounted on the Venturi tube; and the pore plate is connected to a fourth feed water flow transmitter through a pressure guide tube. The invention further relates to a nuclear power plant evaporator water level control method which comprises the steps of S1, judging whether the evaporator water level control system meets a switching condition or not, and conducting quality position fault judgment on the fourth water supply flow transmitter; and S2, when the fourth water supply flow transmitter works normally, switching the system to a second control mode by controlling a manual switching button, and outputting a second control signal to control the opening degree of the large valve and the opening degree of the small valve. The stability and reliability of the evaporator water level control system are greatly improved, transient state of a unit or automatic shutdown of a reactor is prevented, and nuclear safety is guaranteed.
Description
technical field [0001] The invention relates to the field of instrument control, in particular to a water level control system and method for an evaporator in a nuclear power plant. Background technique [0002] The evaporator water level control system is one of the most important control systems of nuclear power units, and the stability of evaporator water level control is crucial to the safe and stable operation of nuclear power units. According to statistics, the number of automatic shutdowns of nuclear power units caused by abnormal evaporator water level control systems at home and abroad is too numerous to enumerate. Due to the deviation of the Venturi tube measurement, in the case of low flow, the feed water flow measurement does not follow (that is, it does not reflect the change of the real flow), resulting in large fluctuations in the water level adjustment of the evaporator. This is a common problem of multi-base nuclear power units. , There have been different ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G05D9/12
CPCG05D9/12
Inventor 陈永伟李元
Owner CHINA GENERAL NUCLEAR POWER OPERATION