A water replenishable drainage method water-release tester upon water encounter

Abstract

The present invention relates to the technical field of testing the gas evolution rate of hazardous chemicals when encountering water, and particularly refers to a water displacement method gas evolution tester with water replenishment function, which includes a gas production system, a water drainage system, a water replenishment auxiliary system, pipelines and gas paths. The gas production system, the water drainage system and the water replenishment auxiliary system form a closed system through pipelines and gas paths; the gas production system includes a reaction bottle, the water drainage system includes a drainage bottle and a water collection bottle, and the water replenishment auxiliary system includes a water storage bottle and a water pump. The present invention uses a small dynamic imbalance to drain water. Any small amount of gas, as long as the volume is equivalent to a water droplet with the diameter of the drainage port, can drain the water; under the action of the water replenishment auxiliary system, the measuring range of the instrument can be effectively increased, and the non-linear change of measurement caused by the reduction of water volume can be effectively overcome, ensuring the accuracy of measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of testing the gas evolution rate of hazardous chemicals when encountering water, and particularly refers to a water displacement method gas evolution tester capable of replenishing water volume. Background Art

[0002] The gas evolution tester when encountering water is mainly used to identify "dangerous goods that emit flammable gases when encountering water" stipulated by the United Nations or other dangerous goods that emit dangerous gases when encountering water. According to the United Nations standard, if the rate of a certain substance emitting flammable gas when encountering water reaches 1 L / (kg·h), it belongs to dangerous substances.

[0003] In actual work, the experiment is judged according to Test N.5 in the United Nations "Manual of Tests and Criteria". The "Manual of Tests and Criteria" does not specifically stipulate the experimental method, nor even the dosage of the sample.

[0004] However, the European Union also has a rule similar to Test N.5, Regulation 440 / 2008. It specifically stipulates that the sample amount used in the test is 10 grams.

[0005] Generally speaking, people often develop instruments in combination with the EU standard to make them have a wider range of applicability. Both standards clearly stipulate that the gas evolution rate is measured at 1-hour intervals and continuously measured for 7 hours. This is an integral measurement, which should be relatively easy to carry out, but it is more difficult to achieve when it comes to gas measurement.

[0006] When combining the two standards, if an experiment is done with a 10-gram sample, a gas flow rate of 10 mL per hour means it belongs to dangerous substances. However, such a gas flow rate is really too small, and its kinetic energy and momentum are not enough to push any traditional flowmeter to measure it, that is, there is no traditional flowmeter in the existing technology that can measure such a small gas flow rate.

[0007] Therefore, most of the existing instruments use indirect methods for measurement, such as measuring the pressure change generated by the released gas and then converting it into the gas volume. And often, the 1-hour integral measurement is decomposed into differential measurements with a sampling time of 1 second.

[0008] However, the pressure increment caused by such a small gas flow rate is also very small - for a gas flow rate of 10 mL / h, that is, 2.8 μL of gas is generated per second, which can only increase the system pressure by 1 Pa (one hundred-thousandth of an atmosphere) of pressure increment. 2.8 μL or 1 Pa are both extremely small values and are extremely difficult to measure accurately and reliably.

[0009] On the other hand, measuring the amount of gas released by the water drainage method is a true integral measurement - as long as the amount of gas generated is large enough to be equivalent to the volume of the dripping water droplets, the water equal in volume to the gas can be drained; by weighing the accumulated drained water volume within one hour, the amount of gas generated within this one hour can be known. Therefore, extremely small amounts of gas can be accurately and reliably measured, and the principle is as Figure 2 shown.

[0010] According to the United Nations standards, dangerous substances that emit flammable gases when in contact with water are divided into three categories. Among them, for Category III, the gas generation rate is greater than 1 L / (kg·h); for Category II, the gas generation rate is greater than 20 L / (kg·h); for Category I, the gas generation rate is greater than or equal to 10 L / (kg·min).

[0011] In the case of a 10-gram sample usage, a Category III sample needs to drain approximately 70 milliliters of water within 7 hours, and a Category II sample may need to drain approximately 1400 milliliters of water, which poses a severe test to the measuring range and linearity of the instrument.

[0012] Moreover, as the drained water volume increases, the water level in the drainage bottle gradually drops, and a water column is formed and gradually increases in the drip water pipe, which will hinder the drainage of water, causing the amount of water that can be drained for the same amount of gas to gradually decrease, affecting the linearity of the measurement.

[0013] Therefore, there is an urgent need for a water replenishing auxiliary system that can replenish water to keep the water level in the drainage bottle roughly at the original position. Summary of the Invention

[0014] The object of the present invention is to provide a water drainage method water-releasing gas tester with water replenishing function to solve the problems existing in the prior art.

[0015] To solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0016] A water drainage method water-releasing gas tester with water replenishing function includes a gas generation system and a water drainage system, and also includes a water replenishing auxiliary system, pipelines and gas paths. The gas generation system, the water drainage system and the water replenishing auxiliary system form a closed system through pipelines and gas paths;

[0017] The gas generation system includes a reaction bottle, the water drainage system includes a drainage bottle and a water collection bottle, and the water replenishing auxiliary system includes a water storage bottle, a water pump and a three-way valve;

[0018] The water storage bottle is respectively connected to the reaction bottle and the drainage bottle through the pipeline, and a water pump and a three-way valve are also connected between the water storage bottle and the reaction bottle, and between the water storage bottle and the drainage bottle. The water storage bottle is used to inject water into the reaction bottle and the drainage bottle;

[0019] The reaction bottle is respectively connected to the water storage bottle and the drainage bottle through the gas path, and the drainage bottle discharges water into the water collecting bottle through a drip pipe.

[0020] As an improvement to the technical solution of the water displacement method water-release tester with water replenishment of the present invention, the gas path includes a main gas path and a branch gas path. The main gas path is respectively connected to the reaction bottle and the drainage bottle, and a gas release valve is provided on the main gas path; one end of the branch gas path is connected to the main gas path, and the other end extends into the water storage bottle.

[0021] As an improvement to the technical solution of the water displacement method water-release tester with water replenishment of the present invention, the pipeline includes a first pipeline, a second pipeline and a third pipeline. The first pipeline is respectively connected to the second pipeline and the third pipeline through the three-way valve;

[0022] Wherein, one end of the first pipeline is connected to the three-way valve, and the other end extends into the water storage bottle;

[0023] One end of the second pipeline is connected to the three-way valve, and the other end extends into the reaction bottle;

[0024] One end of the third pipeline is connected to the three-way valve, and the other end extends into the drainage bottle.

[0025] As an improvement to the technical solution of the water displacement method water-release tester with water replenishment of the present invention, the three-way valve is used to switch the pipeline, and the three-way valve is arranged at the connection of the first pipeline, the second pipeline and the third pipeline;

[0026] When the three-way valve leads to the reaction bottle, the water storage bottle can inject water into the reaction bottle;

[0027] When the three-way valve leads to the drainage bottle, the water storage bottle can inject water into the drainage bottle.

[0028] Advantages of the present invention:

[0029] 1. The structure of the present invention is simple, convenient to use and maintain, and uses a small dynamic imbalance to drain water. Therefore, any small amount of gas, as long as the volume is equivalent to a water droplet with the diameter of the drainage port, can drain the water. In this way, it is easy to measure a small amount of gas;

[0030] 2. Under the action of the water replenishing auxiliary system, the measuring range of the instrument can be effectively increased, and the non-linear change of measurement caused by the reduction of water volume can be effectively overcome, ensuring the accuracy of measurement. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the present invention;

[0032] Figure 2 It is a schematic structural diagram of the drainage method in the prior art.

[0033] Description of the reference numerals: 1 - reaction flask; 2 - drainage flask; 3 - water collection flask; 4 - water storage flask; 5 - three-way valve; 6 - water pump; 7 - main gas path; 8 - branch gas path; 9 - air release valve; 10 - first pipeline; 11 - second pipeline; 12 - third pipeline; 13 - drip pipe. Detailed Embodiments

[0034] To make the invention purpose, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0035] As Figure 1 shown, a water-release-on-contact tester using the drainage method with water replenishment includes a gas production system and a drainage system, and is characterized in that it further includes a water replenishing auxiliary system, pipelines and gas paths. The gas production system, the drainage system and the water replenishing auxiliary system form a closed system through the pipelines and gas paths;

[0036] The gas production system includes a reaction flask 1, the drainage system includes a drainage flask 2 and a water collection flask 3, and the water replenishing auxiliary system includes a water storage flask 4, a water pump 6 and a three-way valve 5;

[0037] The water storage flask 4 is connected to the reaction flask 1 and the drainage flask 2 through pipelines respectively, and a water pump 6 and a three-way valve 5 are also connected between the water storage flask 4 and the reaction flask 1, and between the water storage flask 4 and the drainage flask 2. The water storage flask 4 is used to inject water into the reaction flask 1 and the drainage flask 2;

[0038] The reaction flask 1 is connected to the water storage flask 4 and the drainage flask 2 through gas paths respectively, and the drainage flask 2 discharges water into the water collection flask 3 through a drip pipe 13.

[0039] Among them, the three-way valve 5 is used to switch the pipelines, and the three-way valve 5 is arranged at the connection of the first pipeline 10, the second pipeline 11 and the third pipeline 12;

[0040] When the three-way valve 5 leads to the reaction flask 1, the water storage flask 4 can inject water into the reaction flask 1;

[0041] When the three-way valve 5 leads to the drainage bottle 2, the water storage bottle 4 can inject water into the drainage bottle 2.

[0042] As the first embodiment of the present invention, the gas path includes a main gas path 7 and a branch gas path 8. The main gas path 7 is respectively connected to the reaction bottle 1 and the drainage bottle 2, and a gas release valve 9 is provided on the main gas path 7; one end of the branch gas path 8 is connected to the main gas path 7, and the other end extends into the water storage bottle 4.

[0043] As the second embodiment of the present invention, the pipeline includes a first pipeline 10, a second pipeline 11 and a third pipeline 12. The first pipeline 10 is respectively connected to the second pipeline 11 and the third pipeline 12 through a three-way valve 5;

[0044] Wherein, one end of the first pipeline 10 is connected to the three-way valve 5, and the other end extends into the water storage bottle 4;

[0045] One end of the second pipeline 11 is connected to the three-way valve 5, and the other end extends into the reaction bottle 1;

[0046] One end of the third pipeline 12 is connected to the three-way valve 5, and the other end extends into the drainage bottle 2.

[0047] In the present invention, water is injected into the reaction bottle 1 through the water storage bottle 4 so that the sample releases gas when encountering water, causing the entire system to start working; water is injected into the drainage bottle 2 through the water storage bottle 4 to achieve the effect of replenishing water in the drainage bottle 2 from the water storage bottle 4, so that the water level in the drainage bottle 2 remains approximately at the initial level.

[0048] Specifically, before the preparation work of the present invention, the gas release valve 9 is in an open state, and the sample is placed into the reaction bottle 1; the water storage bottle 4 and the drainage bottle 2 are filled with water, and the excess water is drained, and then the water storage bottle 4, the drainage bottle 2, the gas path and the pipeline are all sealed, so that the whole of the present invention forms a closed system, and the gas and water in the whole system reach a state of pressure balance with the outside of the system; then the gas release valve 9 is closed, and at this time the present invention is in a standby working state.

[0049] Water is injected into the reaction bottle 1 through the water pump 6 and the three-way valve 5. When the water contacts the sample, the timing device is started, and the instrument enters the working state.

[0050] When the sample reacts with water, the sample discharges gas when encountering water, and the gas enters the drainage bottle 2. Under the action of the gas, the water in the drainage bottle 2 drips into the water collection bottle 3 through the dropper. The tester can collect the dripping water according to certain rules, weigh its weight, and determine the volume of the gas generated in the just-passed time interval through temperature coefficient correction, and calculate the gas release rate.

[0051] If the amount of water discharged exceeds a certain threshold, water of equal or slightly less than the amount of water discharged will be injected into the drainage bottle 2 through the water pump 6 and the three-way valve 5, so that the water level is roughly maintained at the initial equilibrium water level, so as to reduce the excessive height difference between the internal and external water columns, which will cause additional pressure on the gas drainage and thus affect the linearity of the exhaust rate.

[0052] In more detail, before entering the preparation state, the present invention opens the exhaust valve, puts the sample to be tested into the reaction bottle 1, fills the water storage bottle 4 and the drainage bottle 2 with water, and drains the excess water;

[0053] Then the water storage bottle 4, the drainage bottle 2, the gas circuit and the pipeline are all sealed, so that the present invention forms a closed system as a whole, and the gas and water in the whole system are in a state of equilibrium with the pressure outside the system;

[0054] As an embodiment of the present invention, Figure 1 It can be seen that one end of the first pipe 10 is connected to the water storage bottle 4, and the other end is connected to the water pump 6 and the three-way valve 5. By adjusting the three-way valve 5, the first pipe 10 is connected to the reaction bottle 1 and the drainage bottle 2 respectively, and water is injected into the reaction bottle 1 and the drainage bottle 2 respectively;

[0055] One end of the second pipe 11 is connected to the three-way valve 5, and the other end extends into the reaction bottle 1 so as to inject water into the reaction bottle 1;

[0056] One end of the third pipe 12 is connected to the three-way valve 5, and the other end extends into the drainage bottle 2, and is used to replenish the water in the water storage bottle 4 into the drainage bottle 2 so that the water is maintained at approximately the initial water level;

[0057] The three-way valve 5 is used to switch the pipeline, and is used to inject the water in the first pipeline 10 into the second pipeline 11 or the third pipeline 12, that is, the three-way valve 5 is used to switch the effect of injecting water into the reaction bottle 1 or into the drainage bottle 2;

[0058] When the entire system is in a state of water and gas balance, the air release valve 9 is closed and the present invention is in a ready-to-work state.

[0059] When the present invention enters the standby state, the three-way valve 5 is adjusted so that the three-way valve 5 can inject water into the reaction bottle 1, and the water pump 6 is started. Water is extracted from the water storage bottle 4 through the water pump 6 and the three-way valve 5 and injected into the reaction bottle 1. When water is injected into the reaction bottle 1, since the reaction bottle 1 contains the sample to be tested, the sample releases gas when it encounters water, and the gas flows along the main gas path 7 into the drainage bottle 2. Since the drainage bottle 2 is filled with water, the gas enters the drainage bottle 2 and, based on the principle of the drainage method, the water in the drainage bottle 2 is discharged. The discharged water drips along the drip pipe 13 into the water collection bottle 3. At this time, the three-way valve 5 is adjusted so that the three-way valve 5 can inject water into the drainage bottle 2.

[0060] Testers can collect the dripping water according to certain rules, weigh its weight, determine the volume of gas generated in the time interval just passed after correction by the temperature coefficient, and calculate the rate of gas release.

[0061] The certain rule here can be to preset a time period and calculate the number of water drops during this time period. Since the dripping pipe 13 is prepared in advance before the test, the diameter of the dripping pipe 13 is known, and then the weighing effect is achieved by the number of drops, time and diameter.

[0062] If the amount of water discharged exceeds a certain threshold, water of equal or slightly less than the amount of water discharged will be injected into the drainage bottle 2 through the water pump 6 and the three-way valve 5, so that the water level is roughly maintained at the initial equilibrium water level, so as to reduce the excessive height difference between the internal and external water columns, which will cause additional pressure on the gas drainage and thus affect the linearity of the exhaust rate.

[0063] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A water-supplementable drainage method water-contact gas-release tester, comprising a gas production system and a drainage system, characterized in that, It also includes a water replenishing auxiliary system, pipelines and gas pipelines, and the gas production system, the drainage system and the water replenishing auxiliary system form a closed system through the pipelines and the gas pipelines; The gas production system includes a reaction flask, the drainage system includes a drainage flask and a water collection flask, and the water replenishing auxiliary system includes a water storage flask, a water pump and a three-way valve; The water storage flask is connected to the reaction flask and the drainage flask respectively through the pipelines, and between the water storage flask and the reaction flask, and between the water storage flask and the drainage flask, the water pump and the three-way valve are also connected, and the water storage flask is used to inject water into the reaction flask and the drainage flask; The reaction flask is connected to the water storage flask and the drainage flask respectively through the gas pipeline, and the drainage flask discharges water into the water collection flask through a drip pipe.

2. The water-supplementable drainage method water-release tester according to claim 1, characterized in that, The gas pipeline includes a main gas pipeline and a branch gas pipeline. The main gas pipeline is respectively connected to the reaction flask and the drainage flask, and a gas release valve is arranged on the main gas pipeline; one end of the branch gas pipeline is connected to the main gas pipeline, and the other end extends into the water storage flask.

3. The water-supplementable drainage method water-release tester according to claim 1, characterized in that, The pipeline includes a first pipeline, a second pipeline and a third pipeline. The first pipeline is respectively connected to the second pipeline and the third pipeline through the three-way valve; Wherein, one end of the first pipeline is connected to the three-way valve, and the other end extends into the water storage flask; One end of the second pipeline is connected to the three-way valve, and the other end extends into the reaction flask; One end of the third pipeline is connected to the three-way valve, and the other end extends into the drainage flask.

4. The water-supplementable drainage method water-release tester according to claim 3, characterized in that The three-way valve is used to switch the pipeline, and the three-way valve is arranged at the connection of the first pipeline, the second pipeline and the third pipeline; When the three-way valve leads to the reaction flask, the water storage flask can inject water into the reaction flask; When the three-way valve leads to the drainage flask, the water storage flask can inject water into the drainage flask.

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