Detection method and special detection system for silica precipitation performance of nuclear power plant water filter element
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A silica and water filter technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of simulated performance detection of water filter elements, low detection accuracy, and actual system pollution, etc., to achieve true and reliable data , high verification efficiency and high simulation degree
Active Publication Date: 2018-01-19
HENAN HEJING CLEANING TECH
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Problems solved by technology
At present, laboratory experiments cannot realize the simulated performance test of the water filter element in the operating state, but indirectly verify it through the laboratory static immersion test of the main raw materials, and then install the filter element in the nuclear power system and verify it through actual operation monitoring The operating characteristics of the filter element have the disadvantages of low detection accuracy, which may cause pollution to the actual system, and may even cause shutdown accidents
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Embodiment 1
[0034] A method for detecting the silica precipitation performance of a nuclear power plant water filter element, comprising the following steps:
[0035] (1) Put the tested filter element (10 inches—5 μm) into the system, add a mixed solution of boric acid with a concentration of 200ppm and LiOH with a concentration of 1.24±10%ppm, so that the height of the solution reaches the upper and lower marks of the liquid level indicator;
[0036] (2) Turn on the pneumatic pump and adjust the flow regulating valve to reach the rated flow rate of the filter element of 4.2m 3 / h;
[0037] (3) Take the initial water sample from the sampling port, to be submitted for inspection and obtain the original concentration of silica in the liquid;
[0038] (4) Turn on the electric heater to gradually increase the temperature to the working temperature of 72±2°C and keep it within this temperature range;
[0039] (5) Sampling on time, the sampling frequency is 1-3 days, 1 time / 24 hours; after th...
Embodiment 2
[0041] The method for detecting the silica precipitation performance of the nuclear power plant water filter element comprises the following steps:
[0042] (1) Put the tested filter element (10 inches—25 μm) into the system, add a mixed solution of boric acid with a concentration of 200ppm and LiOH with a concentration of 1.24±10%ppm, so that the height of the solution reaches the upper and lower marks of the liquid level indicator;
[0043] (2) Turn on the pneumatic pump and adjust the flow regulating valve to reach the rated flow rate of the filter element of 8.4m 3 / h;
[0044] (3) Take the initial water sample from the sampling port, to be submitted for inspection and obtain the original concentration of silica in the liquid;
[0045] (4) Turn on the electric heater to gradually increase the temperature to the working temperature of 72±2°C and keep it within this temperature range;
[0046] (5) Sampling on time, the sampling frequency is 1-3 days, 1 time / 24 hours; after...
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Abstract
Provided is a detection method for silica separation performance of a filter element of a nuclear power plant water filter. The detection method is the laboratory detection method that the filter element of the nuclear power plant water filter is simulated to determine separated silica in a working state and comprises the steps that a detected filter element is installed in a detection system pipeline, an experimental medium is sampled and submitted for detection regularly under the condition that the experimental medium passes through the filter element at rated flow and the maximum working temperature is kept, whether silica separated out from the filter element exceeds the standard or not is judged through analysis on detection data after detection, and detection is conducted according to the standard of SL 91.2-1994 'determination of silica (dissolved) (hetropoly blue method)'. According to the detection method, simulative detection on silica separated out from the filter element of the nuclear power plant water filter can be achieved at the rated flow at the maximum working temperature in the state that ingredients of the filter element approach to those of the working medium. Therefore, specific running parameters of the filter element can be acquired under the approximate real working condition, the verification efficiency of the filter element performance is improved, and a risk influence of a new filter element product on the running safety of a nuclear power system is reduced.
Description
technical field [0001] The invention relates to a method for testing the performance of a water filter element in a nuclear facility, in particular to a laboratory test method for simulating the performance of a water filter element in a nuclear power plant for the precipitation of silicon dioxide in a working state, and is applicable to the water filter element for a nuclear power plant Type inspection or performance verification of the development process. Background technique [0002] With the rapid development of nuclear power technology and the continuous improvement of safety requirements, the performance of water filter elements installed and used in nuclear facilities has also been improved accordingly. There are strict control requirements for the concentration of silica precipitated during its operation to avoid silicon elements. Attached to nuclear fuel cladding and fuel rods in various forms, affecting heat transfer efficiency, and even endangering the safety of ...
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