Light organic petrochemicals water cooler leakage on-line monitoring method and instrument

Abstract

The invention relates to an online monitoring method for the leakage of a lightweight petrochemical water cooler and an instrument. The circulating water in the lightweight petrochemical water cooler is led out online. The circulating water sample is filtered and flows into a gasification chamber through a flowmeter and the process has steam tracing; compressed air is led into the sample of the gasification chamber through the flowmeter and a gas stripping chamber, and combustible gas constituent in the sample is carried to a detection room through cooling and filtration after gas stripping; a high sensitivity combustible gas detector detects the concentration of the combustible gas in the sample, the concentration of the combustible gas in the circulating water is calculated through the flow rates of the detected circulating water and the compressed air; and then the data is displayed on site and converted to a simulation signal or a digital signal to be transmitted to a monitoring center. Compared with the original manual and online analysis method, the invention is lower in cost, high in sensitivity, quick in analysis speed and strong in the capability of resisting pollutant interference, with simpleness, convenience and practicability. The instrument can be directly installed on site. Therefore, the instrument and the method are convenient for realizing the leakage online monitoring of the lightweight petrochemical water cooler with on-site anti-explosion and protection.

Description

Technical field: [0001] The invention relates to a method and an instrument for on-line detection of leakage in circulating cooling water of a water cooler for light petrochemical products, which are applied in the petrochemical field. Background technique: [0002] Petrochemical enterprises use a large number of heat exchange equipment to exchange heat for various logistics in the production process. Many water coolers use circulating water to exchange heat with light petrochemical products such as gas, liquefied gas, gasoline, and naphtha. If the water cooler leaks, the water quality of the circulating water system will seriously deteriorate, major indicators such as COD, BOD, oil content, turbidity, and suspended solids will increase significantly, and the risk of safety accidents such as fire and explosion will increase to a large extent. The deterioration of the circulating water causes the metal surface of the heat exchange tube of the water cooler to be covered with o...

AI Technical Summary

Problems solved by technology

[0006] 3. Install an online chromatograph at the main outlet of circulating water to analyze the concentration of light hydrocarbon components in the gas. This method has high sensitivity and fast analysis speed, but the cost is relatively high. Only one set of online chromatograph (including samples) Processing system) will cost about 400,000 yuan, and it also needs to be installed indoors or in the analysis cabin

This method has high sensitivity and fast analysis speed, but the cost is relatively high. A set of non-explosion-proof analyzers costs about 300,000 yuan and needs to be installed indoors or in an analysis cabin

If the water quality is dirty, it will affect the normal operation of the analyzer

[0008] 5. There is another online oil leakage monitoring technology based on electrochemical sensors, which has not yet been commercialized

However, there are two problems with this method. One is that the water quality of the circulating water is not considered. Under normal circumstances, the circulating water is relatively dirty, and there will be many unidentified substances, which are easy to pollute the electrodes and easily damage the electrodes. The test results cause interference. In addition, there may not be H2S in the circulating water. Even if there is, it may be in the concentration range of several to several thousand ppm, accounting for less than 1% of the leaked petrochemical products, so its detection sensitivity must be at least higher than that of combustible gases. The sensitivity of the detector is 100 times to achieve the same detection effect

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