Trapping device and method for measuring chloride ions in oil through high-temperature combustion hydrolysis-potentiometric titration

A technology of potentiometric titration and high-temperature combustion, which is applied in the direction of chemical analysis by titration and preparation of test samples, etc. It can solve the problem of whether the oil product is completely burned or not, which affects the chlorine ion capture rate and measurement accuracy. Large and other problems, to achieve the effect of strong practicability, avoiding the influence of color, and high capture degree

Pending Publication Date: 2021-06-15
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are two common detection methods for chlorine in oil in the current national and industry standards: one is the oxygen bomb method, the principle of which is to make the oil burn in an oxygen bomb with a specified pressure, and then use an alkaline solution to absorb the chlorine after combustion. For gas, diphenylazocarbohydrazide and bromophenol blue are used as indicators, and mercury nitrate standard solution is used for titration. The problems of this method are: (1) the operation process is relatively complicated; (2) the measurement results are affected by whether the oil is The effect of complete combustion is greater
The other is the high-temperature combustion microcoulomb method, which uses the electric charge to calculate the chloride ion concentration. The main problems are: (1) The measurement accuracy is greatly affected by the electrode material; (2) The adsorption dead angle is easy to form in the device. , affecting the capture rate of chloride ions, resulting in errors

Method used

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  • Trapping device and method for measuring chloride ions in oil through high-temperature combustion hydrolysis-potentiometric titration
  • Trapping device and method for measuring chloride ions in oil through high-temperature combustion hydrolysis-potentiometric titration
  • Trapping device and method for measuring chloride ions in oil through high-temperature combustion hydrolysis-potentiometric titration

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Embodiment 1, referring to accompanying drawings 1-3, a high-temperature combustion hydrolysis-potentiometric titration trapping device for measuring chloride ions in oil, including a potentiometric titrator arranged outside the absorption pool, a high-temperature furnace, a dosing box, and a potentiometric titrator The burette extends from the upper end into the absorption pool, and the upper end of the absorption pool is provided with an anion accumulation device, which includes a cylindrical plasma chamber connected to the absorption pool on one side of the absorption pool cover, and a matching set in the plasma chamber There is an anode sleeve, the upper end of the anode sleeve is connected to the anode of the power supply through a wire, the upper end of the plasma chamber is fixedly connected with a horizontal support rod, and a vertical cathode rod is arranged in the middle of the support rod, and the upper end of the cathode rod passes through The wire is connect...

Embodiment 2

[0060] Embodiment two, the chlorine content in the standard oil sample is detected, and the accuracy of the method is investigated, and the trapping device is referring to embodiment 1, and the method comprises the following steps:

[0061] (1) Preparation

[0062] Step 1: Follow the attached figure 1 As shown, connect the device and instrument, connect the circuit and gas circuit, check the dosing box, and mix the pre-prepared hydrogen peroxide with a mass concentration of 3% and 10g / L sodium hydroxide solution at a volume ratio of 1:1 to obtain a mixed medicine liquid, add the liquid medicine into the medicine box;

[0063] Step 2: Turn on the switch of the oxygen tube, adjust the oxygen flow rate to 400mL / min, check the airtightness of the instrument, and replace the air with oxygen for 15 minutes after there is no air leakage;

[0064] Step 3: Turn on the high-temperature furnace to heat, gradually raise the temperature to 850°C, and keep the constant temperature at 850°...

Embodiment 3

[0084] Embodiment three: the mensuration of the chlorine content in the anti-fuel oil of a certain power plant specifically comprises the following steps:

[0085] (1) Preparatory work: same as Example 2, no more details.

[0086] (2) Oil sample test:

[0087] The first step: Burn the porcelain boat for the test in a muffle furnace, and use it after burning at 850°C for 30 minutes;

[0088] Step 2: Weigh the oil sample m to be 0.4960g and put it into the porcelain boat;

[0089] Step 3: Push the porcelain boat containing the oil sample into the quartz tube, and tighten the rubber stopper to start the experiment;

[0090] Step 4: Spray the chemical solution in the chemical dosing box into the anode sleeve through the spray device, and adjust the flow rate of the chemical spray pipeline to 10mL / min during the test;

[0091] Step 5: After the oil sample is burned for 25 minutes, stop the oxygen flow, remove the rubber stopper, take out the porcelain boat in the quartz tube, an...

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Abstract

The invention relates to a trapping device and method for measuring chloride ions in oil through high-temperature combustion hydrolysis-potentiometric titration. An oil sample is gasified and decomposed after being combusted in a high-temperature furnace of the device, and the decomposed oil sample and oxygen form airflow which enters a plasma chamber from an inner port of a quartz tube; the airflow ascends in the plasma chamber and is mixed with atomized medicine sprayed by the spraying device for mass transfer, chloride ions in the airflow are dissolved in spray to form negatively-charged liquid drops, the negatively-charged liquid drops move towards the anode sleeve under the action of coulomb force and are captured, and finally, the negatively-charged liquid drops enter the absorption cell under the action of gravity and spray washing. Titrating the solution in the absorption cell through a potentiometric titrator so as to calculate the content of chloride ions in the sample; according to the method disclosed by the invention, an adsorption dead angle is not easy to form in the device during determination, and the capture degree of chloride ions in oil is higher under the charged condition; the spray continuously washes the anode plate, so that the chlorine-containing liquid drops enter the absorption cell, and therefore, direct titration can be realized without additionally washing the device, and the working efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of chlorine ion testing devices, in particular to a high-temperature combustion hydrolysis-potentiometric titration trapping device and method for measuring chlorine ions in oil. Background technique [0002] Lubricating oil and anti-fuel oil are common lubricating media in thermal power plants. Excessive chloride ion content in oil will cause corrosion to pipelines and valves through which the oil flows. Therefore, the chlorine content in oil is an important monitoring index for oil quality operation and maintenance. [0003] There are two common detection methods for chlorine in oil in the current national and industry standards: one is the oxygen bomb method, the principle of which is to make the oil burn in an oxygen bomb with a specified pressure, and then use an alkaline solution to absorb the chlorine after combustion. For gas, diphenylazocarbohydrazide and bromophenol blue are used as indicators, and...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/44
CPCG01N31/16G01N1/44
Inventor 王宁邵轶凡刘杨惠珍郑杰李紫恬尹明霞康静艳
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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