Hydrogen sulfide corrosion test device with on-line pH value adjustment function

Abstract

A hydrogen sulfide corrosion test device with an on-line pH value adjustment function comprises a test container which is provided with a liquid inlet, a first gas inlet, a first gas outlet and an electrode mounting port; the first gas inlet is connected with a test gas source through a pipeline and a valve; the pH electrode is inserted into the test container from the test container electrode mounting opening; the stirrer is arranged in the test container; a second air inlet, a second air outlet and a liquid taking opening are formed in the adjusting solution container; the second gas inlet is connected with a deoxygenation gas source through a pipeline and a valve; an inlet of the metering pump is connected with the liquid taking pipe and extends into the adjusting solution container; an outlet of the metering pump is connected with a liquid inlet of the test container through a connecting pipeline; the pH electrode, the metering pump, the stirrer and the valve are electrically connected with the controller respectively. According to the utility model, the pH value is adjusted on line in a hydrogen sulfide corrosion test process in a totally closed environment; and compared with manual adjustment, the adjustment efficiency and the pH control accuracy are improved, and particularly the test process is safer.

Description

TECHNICAL FIELD

[0001] The utility model relates to pH experimental device, especially in a kind of hydrogen sulfide corrosion test device with on-line adjustment pH. BACKGROUND

[0002] Test solution may change in the process of test, and the change range of pH should be controlled within 0.1, otherwise, pH adjustment should be carried out to ensure that pH is within the required range. Some customers require pH adjustment during the test process.

[0003] The prior art method is very dependent on experience and tedious, and requires to extract test solution, measure pH offline, and inject adjusting solution into test container through syringe when pH is close to or exceeds the range for adjustment. The time point of offline measurement in this process is not easy to determine, and sometimes adjustment needs to be carried out at night, otherwise, the change of pH is relatively large, and after adjustment, liquid needs to be taken again for confirmation, which is very tedious. After adding adjusting solution, test solution needs time for homogenization, otherwise, the accuracy of measurement result may be affected, adjustment operation is misled, solution is adjusted to a more severe pH environment, which may cause test failure. In addition, the adjusting solution added is not deoxygenated, and oxygen enters, which makes test conditions more severe, and test sample may crack, resulting in unqualified test material. The laboratory has carried out Taishan Petroleum certification test, and due to arrangement error of detection time point, pH value seriously exceeds the upper limit, resulting in invalid test. In order to solve the problem, it is urgent to design an efficient and accurate pH adjustment method.

[0004] There are also some pH automatic adjustment devices in the prior art, mainly used in the fields of aquaculture (Chinese patent CN117572906A), chemical reaction kettle (Chinese patent CN112316851A), wastewater treatment (Chinese patent CN101200326A) and the like, which realize pH automatic adjustment through the opening of electromagnetic valve and pressure-driven adjusting liquid. These patents are used in some relatively large capacity occasions, and there is no involvement in the scene containing toxic and harmful substances.

[0005] And the hydrogen sulfide corrosion test container is small, the control range is narrow, and the hydrogen sulfide gas is toxic, so the whole system must be in a strictly sealed state, and the tail gas needs to be absorbed by alkali absorption tank. SUMMARY

[0006] The utility model aims at providing a kind of hydrogen sulfide corrosion test device with on-line adjustment pH, which realizes on-line adjustment pH in the process of hydrogen sulfide corrosion test in fully enclosed environment, and can accurately adjust solution pH, especially compared with manual adjustment, improves adjustment efficiency and the accuracy of pH control, and especially ensures personnel safety during the test process.

[0007] In order to achieve the above object, the technical scheme of the utility model is:

[0008] A hydrogen sulfide corrosion test device with on-line pH adjustment, comprising:

[0009] A test container, which is provided with a liquid inlet, a first gas inlet, a first gas outlet and an electrode installation port; wherein the first gas inlet is connected to a test gas source through a pipeline and a valve;

[0010] A pH electrode, which is inserted into the test container from the electrode installation port of the test container;

[0011] A stirrer, which is arranged in the test container;

[0012] An adjusting solution container, which is provided with a second gas inlet, a second gas outlet and a liquid outlet; wherein the second gas inlet is connected to an oxygen removal gas source through a pipeline and a valve;

[0013] A metering pump, the inlet of which is connected to a liquid taking pipe and extends into the adjusting solution container from the liquid outlet of the adjusting solution container; the outlet of the metering pump is connected to the liquid inlet of the test container through a connecting pipeline;

[0014] A controller, which is electrically connected to the pH electrode, the metering pump, the stirrer and the valve.

[0015] Further, a recorder is electrically connected to the controller.

[0016] Preferably, the stirrer is a magnetic stirrer, the test container is placed on the magnetic stirrer, and a magnetic stirring rod is arranged at the bottom of the test container.

[0017] Preferably, the test container is provided with a reserved port for adding and taking the test solution for offline measurement.

[0018] Preferably, the second gas inlet of the adjusting solution container is connected to a nitrogen tank or a helium tank through a pipeline.

[0019] In the hydrogen sulfide corrosion test device provided by the utility model:

[0020] A test container, which is provided with a liquid inlet, a gas inlet, a gas outlet, an electrode installation port and a reserved port. The reserved port is used for adding and taking the test solution for offline measurement, such as hydrogen sulfide concentration measurement, pH offline measurement comparison, etc.

[0021] An adjusting solution container, which is provided with a second gas inlet, a second gas outlet and a liquid outlet, and preferably three joints for gas inlet, gas outlet and liquid taking are arranged. The liquid taking head of the metering pump is arranged in the adjusting solution container.

[0022] Because the test solution contains hydrogen sulfide and corrosion products, the pH electrode selects a high-pollution-resistant and toxic-resistant electrode, the test container is connected through an external thread, and online pH detection is realized.

[0023] To reduce a large amount of manual operation, a metering pump is used to realize automatic liquid addition, and the concentration of a suitable adjusting liquid can be accurately adjusted to avoid over-adjustment.

[0024] The controller collects the electrode signal, sets the upper and lower limit values of the pH value, and controls the metering pump to automatically adjust the pH value.

[0025] The (paperless) recorder records the pH value, and the record can be exported to check the pH value change during the test and confirm whether the pH value control is within the required range after the test.

[0026] The stirrer is preferably a magnetic stirrer. The main consideration is to quickly homogenize the solution after liquid addition, and the test container needs to be sealed, so a magnetic stirrer is used to stir the test solution.

[0027] The beneficial effects of the utility model are as follows:

[0028] During the hydrogen sulfide corrosion test, the electrode is poisoned by toxic substances. The utility model realizes automatic liquid addition under the requirement of no oxygen by designing the test container, the adjusting solution container, the pH electrode and the metering pump, and the concentration of the suitable adjusting liquid can be accurately adjusted to avoid over-adjustment. Compared with manual adjustment, the adjustment efficiency and the accuracy of pH control are improved, and the test process is safer. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure of the embodiment of the utility model is shown in the figure. DETAILED DESCRIPTION

[0030] The following embodiments are used to specifically illustrate the content of the utility model, and these embodiments only generally describe the content of the utility model and do not limit the content of the utility model.

[0031] Referring to Figure 1 The hydrogen sulfide corrosion test device with online pH value adjustment according to the utility model comprises:

[0032] The test container 1 is provided with a liquid inlet 101, a first gas inlet 102, a first gas outlet 103 and an electrode mounting port 104; wherein the first gas inlet 102 is connected to a test gas source through a pipeline and a valve;

[0033] The pH electrode 2 is inserted into the test container 1 from the electrode mounting port 104 of the test container 1.

[0034] The stirrer 3 is arranged in the test container 1.

[0035] The adjusting solution container 4 is provided with a second gas inlet 401, a second gas outlet 402 and a liquid outlet 403; the second gas inlet 401 is connected to a deoxidizing gas source through a pipeline and a valve;

[0036] The metering pump 5 has an inlet connected to a liquid taking pipeline and extends into the adjusting solution container 4 from the liquid outlet 403 of the adjusting solution container 4; the outlet of the metering pump 5 is connected to the liquid inlet 101 of the test container 1 through a connecting pipeline;

[0037] The controller 6 is electrically connected to the pH electrode 2, the metering pump 5, the stirrer 3 and the valve.

[0038] Further, a recorder 7 is electrically connected to the controller 6.

[0039] Preferably, the stirrer 3 is a magnetic stirrer, the test container 1 is placed on the magnetic stirrer, and the magnetic stirring rod 31 is arranged at the bottom of the test container 1.

[0040] Preferably, the test container 1 is provided with a reserved port 105 for adding and taking the test solution for offline measurement.

[0041] Preferably, the second gas inlet of the adjusting solution container is connected to a nitrogen tank or a helium tank through a pipeline.

[0042] Operation process:

[0043] The adjusting solution is placed in the adjusting solution container, the loaded sample is placed in the test container, the test container and the adjusting solution container are deoxidized through the first and second gas inlets and the first and second gas outlets, the pre-deoxidized test solution is added into the test container through the reserved port, the test container is deoxidized after being filled with the test solution, then the test gas is introduced through the second gas inlet until saturation, then the test gas flow is reduced, the magnetic stirrer is started, the controller and the recorder are started, the pH control range is set, the metering pump is started, when the pH of the test solution exceeds the target value, the metering pump pumps the adjusting solution into the test container until the pH is adjusted to within the target value, the liquid pumping is stopped, and the pH adjustment is completed automatically during the whole test period.

Claims

1. A hydrogen sulfide corrosion test device with online pH adjustment, characterized in that: include: A test container is provided with a liquid inlet, a first air inlet, a first air outlet, and an electrode mounting port; wherein the first air inlet is connected to a test gas source through a pipe and a valve; The pH electrode is inserted into the test container through the electrode installation port of the test container; A stirrer, installed in the test container; A regulating solution container is provided with a second air inlet, a second air outlet, and a liquid extraction port; wherein the second air inlet is connected to a deoxygenating gas source through a pipeline and a valve; A metering pump, the inlet of which is connected to a liquid taking pipe and extends from the liquid taking port of the adjusting solution container into the adjusting solution container; the outlet of the metering pump is connected to the liquid inlet of the test container through a connecting pipe; A controller is provided, wherein the pH electrode, metering pump, stirrer and valve are electrically connected to the controller respectively.

2. The hydrogen sulfide corrosion test device with online pH adjustment according to claim 1, characterized in that: The device also includes a recorder electrically connected to the controller.

3. The hydrogen sulfide corrosion test device with online pH adjustment according to claim 1, characterized in that: The stirrer is a magnetic stirrer, the test container is placed on the magnetic stirrer, and the magnetic stirrer is arranged at the bottom of the test container.

4. The hydrogen sulfide corrosion test device with online pH adjustment according to claim 1 or 3, characterized in that: The test container is provided with a reserved opening for adding a test solution and taking out the test solution for off-line measurement.

5. The hydrogen sulfide corrosion test device with online pH adjustment according to claim 1, characterized in that: The second gas inlet of the regulating solution container is connected to a nitrogen tank or a helium tank through a pipeline.

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