Chemical detection device for water quality

Abstract

The invention relates to a chemical detection device for water quality and belongs to the technical field of chemical detection equipment. The chemical detection device for the water quality comprisesa sample charging basket, a multi-way valve, a high-temperature and high-pressure digestion chamber and a vacuum pump, wherein the sample charging basket, the multi-way valve and the high-temperatureand high-pressure digestion chamber are communicated in sequence through a pipeline; a circulating pump and a flow meter are arranged on the pipeline between the sample charging basket and the multi-way valve; a solenoid valve is arranged on the pipeline between the multi-way valve and the high-temperature and high-pressure digestion chamber; a liquid discharging opening is formed in the lower end of the high-temperature and high-pressure digestion chamber; the liquid discharging opening is communicated with the vacuum pump and a waste liquid bucket in sequence; a safety pressure relief valveis arranged on a side wall of the high-temperature and high-pressure digestion chamber; the safety pressure relief valve is communicated with a first filter and a first air outlet in sequence. According to the chemical detection device for the water quality, provided by the invention, the vacuum pump is vacuumized to pump out liquid in the high-temperature and high-pressure digestion chamber, sothat the pipeline blocking is effectively prevented.

Description

technical field [0001] The invention relates to a water quality chemical detection device, which belongs to the technical field of chemical detection equipment. Background technique [0002] Water is one of the most important sources of life for human beings. With the development of modern industry, water pollution is becoming more and more serious. The chemical oxygen demand in sewage discharge is often used to measure the pollution of sewage discharge and establish a stable chemical demand. Oxygen online monitoring system is very important. [0003] Traditional chemical oxygen demand (hereinafter referred to as COD) detection instruments have problems of difficult maintenance, high failure rate, and inaccurate measurement. For example, traditional COD detectors are connected to sampling pumps and high-temperature and high-pressure digestion chambers through multi-port valves. In the case of high-temperature digestion in the digestion chamber, the high-pressure environment...

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Problems solved by technology

[0003] Traditional chemical oxygen demand (hereinafter referred to as COD) detection instruments have problems of difficult maintenance, high failure rate, and inaccurate measurement. For example, traditional COD detectors are connected to sampling pumps and high-temperature and high-pressure digestion chambers through multi-port valves. In the case of high-temperature digestion in the digestion chamber, the high-pressure environment generated is likely to affect the multi-port valve, resulting in liquid channeling, contaminating gas reagents, and even damaging the multi-port valve; another example is the traditional high-temperature and high-pressure digestion chamber with one channel in and out , in the test water sample, if the concentration of chloride ions is too high, the solution will produce a large amount of precipitation after digestion and cooling, and it is easy to block the small pipelines such as the multi-way valve when the waste liquid is discharged.

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