On-site detection device and method for physical and chemical properties of foam liquid

Abstract

The invention discloses an on-site detection device and method for physical and chemical properties of foam liquid, and belongs to the technical field of detection. The device comprises a movable base wheel vehicle, and a temperature pretreatment area and a sample detection area which are arranged on the base wheel vehicle; the temperature pretreatment area comprises a high-temperature pretreatment unit and a low-temperature pretreatment unit; each of the high-temperature pretreatment unit and the low-temperature pretreatment unit comprises a pretreatment container capable of controlling the temperature; the two pretreatment containers are communicated; the sample detection area comprises a plurality of detection units; the detection unit comprises a detection vessel and a detection probe capable of extending into the detection vessel; the detection probes of different detection units are different; foam liquid to be detected stands in the pretreatment container, at the first temperature, of the high-temperature pretreatment unit, then is transferred to the pretreatment container, at the second temperature, of the low-temperature pretreatment unit to stand, and finally is transferred to the multiple detection vessels to be detected by the corresponding detection probes. The method has the advantages of simple operation, accurate detection, high detection efficiency and the like.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and relates to a foam liquid detection device, and in particular to an on-site detection device and method for the physical and chemical properties of foam liquid. Background Art

[0002] As a fire-fighting agent, foam fire extinguishing agent can extinguish fires of non-water-soluble, water-soluble flammable liquids and general solids. It is widely used in firefighting work in many places such as petrochemicals, construction, ships, airports, etc. It has a rich variety of types, and its main components include foaming agents, film-forming agents, foam stabilizers, pour point depressants, and water. At present, there are differences in the production process and formula of foam fire extinguishing agents at home and abroad, resulting in different product quality. In view of this, in order to ensure product quality, it is extremely necessary to perform performance testing on foam fire extinguishing agents, which is naturally inseparable from effective foam fire extinguishing agent performance testing instruments and equipment.

[0003] In the current field of fire detection, the detection of foam fire extinguishing agents faces many challenges and limitations. As far as the detection process is concerned, it requires the coordinated operation of a large number of instruments and equipment with different functions and types to be completed. Moreover, its detection method is extremely complicated and cumbersome. Each detection link has strict and detailed operating procedures and standards, and the staff needs to spend a lot of time and energy to implement them step by step. The most inconvenient thing is that such a rigorous and complex detection process can only be carried out in a laboratory environment due to the volume of instruments and equipment, the requirements of the operating environment, and the high requirements of the detection method for stability and accuracy. This undoubtedly brings great trouble to key fire prevention places such as substations. Since it is impossible to conduct random inspections of arrivals directly in the station, the products can only be transported to the laboratory, which not only consumes a lot of time and manpower and material costs, but also may cause some unforeseen impacts on the samples during transportation, thereby interfering with the accuracy of the test results. Similarly, when testing foam fire extinguishing agents in service, it is difficult to grasp their performance changes in real time because they cannot be carried out on site. Once the foam fire extinguishing agent has performance problems at a critical moment, the consequences will be disastrous. Summary of the invention

[0004] The invention provides a device and method for on-site detection of physical and chemical properties of foam liquid, so as to overcome the defects of the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In the first aspect, the present invention provides an on-site detection device for the physical and chemical properties of a foam liquid: comprising a movable base wheeled vehicle and a temperature pretreatment zone and a sample detection zone arranged thereon; the temperature pretreatment zone comprises a high-temperature pretreatment unit and a low-temperature pretreatment unit; the high-temperature pretreatment unit and the low-temperature pretreatment unit both comprise a pretreatment container capable of controlling the temperature; the two pretreatment containers are connected; the sample detection zone comprises a plurality of detection units; the detection unit comprises a detection dish and a detection probe capable of extending into the detection dish; the detection probes of different detection units are different; the foam liquid to be detected is allowed to stand in a pretreatment container of the high-temperature pretreatment unit at a first temperature, then transferred to a pretreatment container of the low-temperature pretreatment unit at a second temperature to stand, and finally transferred to a plurality of detection dishes to be detected by corresponding detection probes.

[0007] Optionally, the high-temperature pretreatment unit and the low-temperature pretreatment unit both further include a pretreatment temperature well, the pretreatment container is placed in the pretreatment temperature well, and the pretreatment temperature well controls the temperature of the pretreatment container.

[0008] Optionally, the high-temperature pretreatment unit also includes a liquid nitrogen cylinder; the pretreatment containers of the high-temperature pretreatment unit and the low-temperature pretreatment unit are connected through a liquid conduit; one end of the liquid conduit connected to the pretreatment container of the high-temperature pretreatment unit extends into the bottom of the pretreatment container; the liquid nitrogen cylinder is connected to the pretreatment container through a gas pipeline, the pressure of the pretreatment container is increased by inputting nitrogen, and the foam pressure is pressed into the pretreatment container of the low-temperature pretreatment unit through the liquid conduit; a one-way valve is provided on the liquid conduit.

[0009] Optionally, the high-temperature pretreatment unit further comprises a stirrer; the stirrer is arranged in the pretreatment container, and stirs the foam liquid when nitrogen is input from the liquid nitrogen cylinder.

[0010] Optionally, the cryogenic pretreatment unit further comprises a liquid nitrogen cylinder, which is connected to the pretreatment container through a gas pipeline, and the pressure of the pretreatment container is increased by inputting nitrogen, so that the foam liquid is pressed into a plurality of test dishes. That is, the pretreatment container of the cryogenic pretreatment unit is connected to a plurality of test dishes through an outlet pipe, and the outlet pipe comprises a main pipe and a plurality of branch pipes, one end of the main pipe extends into the bottom of the pretreatment container of the cryogenic pretreatment unit, and the other end is connected to one end of a plurality of branch pipes, and the other ends of the plurality of branch pipes are respectively connected to a plurality of test dishes. The outlet pipe is provided with an electromagnetic valve and a flow meter, which can quantitatively export the foam liquid that has been temperature pretreated. At the same time, the cryogenic pretreatment unit also comprises an agitator arranged in the pretreatment container, so as to facilitate the foam liquid to be pressed into the test dish.

[0011] Optionally, the pretreatment container is an openable container with a circular cross-section, and its top cover is in the shape of an arc top.

[0012] Optionally, the number of the detection units is three, and the detection probes of the three detection units are respectively a pH acidity meter probe, a surface tension meter probe (i.e. a surface tension probe with a platinum wire ring) and an interfacial tension meter probe (i.e. an interfacial tension probe with a platinum wire ring), and the interfacial tension meter probe is also equipped with a cyclohexane injection port.

[0013] Optionally, the sample detection area further includes a detection temperature well, the detection temperature well has detection pools corresponding to the plurality of detection dishes one by one, the plurality of detection dishes are placed in the corresponding detection pools, and the detection temperature well controls the temperature of the plurality of detection dishes.

[0014] Optionally, the detection unit further includes a robotic arm; the robotic arm is disposed above the detection dish to control the lifting and lowering of the detection probe.

[0015] In a second aspect, the present invention provides a detection method for the above-mentioned on-site detection device for the physical and chemical properties of the foam liquid: the temperature of the pretreatment container of the high-temperature pretreatment unit is adjusted to 60°C, and the temperature of the pretreatment container of the low-temperature pretreatment unit is adjusted to 25°C; the foam fire extinguishing agent sample collected on site is poured into the pretreatment container of the high-temperature pretreatment unit, and after standing for 7 days, it is transferred to the pretreatment container of the low-temperature pretreatment unit and stood for 1 day to obtain the temperature pretreated sample; the sample is transferred to a plurality of test dishes, and the sample is tested accordingly using a detection probe; the detection probe is a pH acidity meter probe; the pH acidity meter probe The probe is a surface tension meter probe. The surface tension meter probe is immersed in the sample, and after stabilization for 3 minutes, the pH value is read. The detection probe is a surface tension meter probe. The surface tension meter probe is immersed in the sample, and after stabilization for 3 minutes, it is slowly and evenly lifted up. The maximum tension when the surface tension meter probe leaves the liquid surface is the surface tension value. The detection probe is an interfacial tension meter probe. Cyclohexane liquid is poured on the surface of the sample, and the interfacial tension meter probe is immersed in the part below the interface of the two liquids. After stabilization for 3 minutes, it is slowly and evenly lifted up. The maximum tension when the interfacial tension meter probe passes through the interface of the two liquids is the interfacial tension value. The diffusion coefficient is calculated based on the surface tension and interfacial tension: S = γ e -γ f -γ i ; S is the diffusion coefficient, γ e is the surface tension of cyclohexane, γ f is the surface tension of the sample, γ i is the interfacial tension value between the sample and cyclohexane; several tests are performed, and the average value of the several test results is the measurement result of the sample.

[0016] The beneficial effects of the present invention are as follows: the present invention provides an on-site detection device and method for the physical and chemical properties of foam liquid, which can carry out temperature treatment of foam fire extinguishing agent on site, and conduct rapid and accurate on-site detection of pH value, surface tension, interfacial tension, diffusion coefficient, etc. of foam fire extinguishing agent before and after temperature treatment. Therefore, the present invention can be used for the on-site inspection of foam fire extinguishing agent products arriving at key fire prevention locations such as substations and on-site detection of in-service status. The device and method are simple to operate, improve the efficiency of quality detection of foam fire extinguishing agent by fire supervision, and can be used as a conventional detection device and method for fire supervision departments to detect foam fire extinguishing agents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the structure of a high temperature pretreatment unit;

[0018] Figure 2 is a top view of the temperature pretreatment zone;

[0019] Figure 3 Schematic diagram of the top view of the sample detection area;

[0020] Figure 4 It is a schematic diagram of the main structure of the sample detection area. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0022] The invention provides a foam liquid physical and chemical property on-site detection device, comprising a movable base wheel vehicle and a temperature pretreatment area, a sample detection area and an electrical control area arranged on the base wheel vehicle.

[0023] like Figure 1 and 2 As shown, the temperature pretreatment zone includes a high temperature pretreatment unit 11 and a low temperature pretreatment unit 12. The high temperature pretreatment unit 11 and the low temperature pretreatment unit 12 each include a temperature-controllable pretreatment container 111. The pretreatment containers of the high temperature pretreatment unit 11 and the low temperature pretreatment unit 12 are in communication.

[0024] like Figure 3 and 4 As shown, the sample detection area includes three detection units 21. The detection unit 21 includes a detection dish 211 and a detection probe 212 that can extend into the detection dish 211. The detection probes 212 of different detection units 21 are different.

[0025] The foam liquid to be tested is allowed to stand in the pretreatment container 111 of the high-temperature pretreatment unit 11 at a first temperature, then transferred to the pretreatment container 111 of the low-temperature pretreatment unit 12 at a second temperature, and finally transferred to three test dishes 211 to be tested by corresponding test probes 212.

[0026] About temperature pretreatment area: Figure 1 As shown, in a preferred embodiment, the high temperature pretreatment unit 11 and the low temperature pretreatment unit 12 also include a pretreatment temperature well 112, and the pretreatment container 111 is placed in the pretreatment temperature well 112, and the pretreatment temperature well 112 controls the temperature of the pretreatment container 111. The pretreatment temperature well 112 can set a constant temperature and a constant temperature time, and the temperature control method is electric heating and condensation freezing. The settable temperature range is -40°C to 70°C, and the settable constant temperature time is not less than 168h.

[0027] The high temperature pretreatment unit 11 further includes a liquid nitrogen cylinder 113. The pretreatment containers of the high temperature pretreatment unit 11 and the low temperature pretreatment unit 12 are connected via a liquid conduit 13. One end of the liquid conduit 13 connected to the pretreatment container 111 of the high temperature pretreatment unit 11 extends into the bottom of the pretreatment container 111. The liquid nitrogen cylinder 113 is connected to the pretreatment container 111 via a gas pipeline 1131, and the pressure of the pretreatment container 111 is increased by inputting nitrogen, and the foam is pressed into the pretreatment container of the low temperature pretreatment unit 12 via the liquid conduit 13.

[0028] A one-way valve is provided on the liquid guide tube 13. The gas pipeline 1131 is made of corrosion-resistant material and is provided with a liquid check valve and a solenoid valve. The liquid check valve prevents the foam liquid from entering the liquid nitrogen cylinder 113, and the solenoid valve is used to control whether the nitrogen is sprayed and the amount of spraying. A pressure valve 115 is installed on the top of the pretreatment container 111 for pressure limiting and automatic exhaust.

[0029] The high temperature pretreatment unit 11 further includes a stirrer 114. The stirrer 114 is disposed in the pretreatment container 111 and stirs the foam liquid when the liquid nitrogen cylinder 113 inputs nitrogen gas, so as to facilitate the foam liquid to be pressed into the pretreatment container of the low temperature pretreatment unit 12. Specifically, the stirrer 114 may be a long-rod propeller stirrer.

[0030] In a preferred embodiment, the cryogenic pretreatment unit 12 further comprises a liquid nitrogen cylinder, which is connected to the pretreatment container through a gas pipeline, and the pressure of the pretreatment container is increased by inputting nitrogen, so that the foam liquid is pressed into the three test dishes 211. That is, the pretreatment container of the cryogenic pretreatment unit 12 is connected to the three test dishes 211 through a derivation pipe, and the derivation pipe comprises a main pipe and three branch pipes, one end of the main pipe extends into the bottom of the pretreatment container of the cryogenic pretreatment unit 12, and the other end is connected to one end of the three branch pipes, and the other ends of the three branch pipes are respectively connected to the three test dishes 211. The derivation pipe is provided with a solenoid valve and a flow meter, which can quantitatively export the foam liquid that has been temperature pretreated. At the same time, the cryogenic pretreatment unit 12 also comprises a stirrer arranged in the pretreatment container, so as to facilitate the foam liquid to be pressed into the test dish. Of course, the cryogenic pretreatment unit 12 can also be provided with no liquid nitrogen cylinder and stirrer, and the foam liquid can be transferred manually.

[0031] like Figure 1 As shown, in a preferred embodiment, the pretreatment container 111 is an openable container with a circular cross section, and its top cover is in the shape of an arc top. When nitrogen is input, the arc top-shaped top cover is more evenly stressed to extend the service life of the pretreatment container 111. The material of the pretreatment container 111 is high temperature resistant stainless steel.

[0032] Regarding the sample detection area: the detection probes 212 of the three detection units 21 are respectively a pH acidity meter probe, a surface tension meter probe (i.e. a surface tension probe with a platinum wire ring) and an interfacial tension meter probe (i.e. an interfacial tension probe with a platinum wire ring), and the interfacial tension meter probe is also equipped with a cyclohexane injection port.

[0033] like Figure 3 and Figure 4 As shown, in a preferred embodiment, the sample detection area also includes a detection temperature well 22, and the detection temperature well 22 has a detection pool 221 corresponding to the three detection dishes 211. The three detection dishes 211 are placed in the corresponding detection pool 221, and the detection temperature well 22 controls the temperature of the three detection dishes 211. The detection temperature well 22 can set a constant temperature and a constant temperature time. The temperature control method is electric heating and condensation freezing. The settable temperature range is -40°C to 70°C, and the settable constant temperature time is not less than 168h. The detection pool 221 is trough-shaped, with an inner size of 6cm×6cm×6cm. The detection dish 211 is an open rectangular parallelepiped, with an inner size of 5cm×5cm×15cm. The material of the detection dish 211 is polytetrafluoroethylene or glass.

[0034] In a preferred embodiment, the detection unit 21 further includes a mechanical arm 213. The mechanical arm 213 is disposed above the detection dish 211 to control the detection probe 212 to rise and fall.

[0035] The electrical control area includes a temperature setting screen for controlling the pre-treatment temperature well 112 and the detection temperature well 22, a motor for driving the mechanical arm 213, a control chip, and a power connection line.

[0036] The on-site testing method for the physical and chemical properties of foam liquid is:

[0037] Before testing, the temperature of the pretreatment container 111 of the high temperature pretreatment unit 11 is adjusted to 60°C, and the temperature of the pretreatment container 111 of the low temperature pretreatment unit 12 is adjusted to 25°C. Then, the foam fire extinguishing agent sample collected on site is poured into the pretreatment container 111 of the high temperature pretreatment unit 11, and after standing for 7 days, the solenoid valve of the liquid nitrogen cylinder 113 of the high temperature pretreatment unit 11 and the one-way valve of the liquid guide tube 13 are opened, so that the foam liquid is transferred to the pretreatment container of the low temperature pretreatment unit 12 under the push of high pressure nitrogen, the one-way valve is closed, and the sample is left standing for 1 day to obtain the sample after temperature pretreatment.

[0038] The temperature of the sample detection zone detection temperature well 22 is adjusted to 25° C. The solenoid valve of the liquid nitrogen cylinder 113 of the low-temperature pretreatment unit 12 is opened, and the sample is transferred to three detection dishes 211 under the push of high-pressure nitrogen. The depth of the sample in each detection dish 211 is 5 to 7 cm, and then the detection probe 212 is used to perform corresponding detection on the sample.

[0039] pH value detection: The pH acidity meter probe is immersed in the sample through the control of the robot arm 213, and the pH value is read after stabilization for 3 minutes. After the robot arm 213 lifts the pH acidity meter probe, it is cleaned with a washing bottle and then a second test is performed. The average of the two test results is the pH value measurement result of the sample.

[0040] Surface tension test: The surface tension probe with a platinum wire ring is immersed in the sample through the control of the mechanical arm 213. After stabilization for 3 minutes, it is slowly lifted up at a uniform speed, and the maximum tension at the moment when the surface tension meter probe leaves the liquid surface is recorded. After the mechanical arm 213 lifts the surface tension meter probe, it is cleaned with a washing bottle and then a second test is performed. The average of the two test results is the measurement result of the surface tension of the sample.

[0041] Interfacial tension test: Pour 5mm thick cyclohexane liquid on the surface of the sample, and control the interfacial tension probe with a platinum wire ring to immerse it below the interface of the two liquids through the control of the mechanical arm 213. After stabilization for 3 minutes, slowly and evenly lift it up, and record the maximum tension of the interfacial tension meter probe when it passes through the interface of the two liquids. After the mechanical arm 213 lifts the interfacial tension meter probe, use a washing bottle to clean the probe, and then perform a second test. The average of the two test results is the test result of the interfacial tension of the sample.

[0042] Diffusion coefficient calculation: S = γ e -γ f -γ i In the formula, S is the diffusion coefficient, γ e is the surface tension of cyclohexane, γ f is the surface tension of the sample, γ i It is the interfacial tension value between the foam liquid and cyclohexane, and the unit is millinewton per meter (mN / m).

[0043] In the present invention, unless otherwise specified, the scientific and technical terms used herein have the meanings commonly understood by those skilled in the art. In addition, the reagents, materials and operating procedures used herein are reagents, materials and conventional procedures widely used in the corresponding fields.

[0044] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. cited in the invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for on-site detection of the physical and chemical properties of foam liquid, characterized by: It includes a movable base wheeled vehicle and a temperature pretreatment area and a sample detection area arranged thereon; The temperature pretreatment area includes a high temperature pretreatment unit and a low temperature pretreatment unit; The high temperature pretreatment unit and the low temperature pretreatment unit both include a pretreatment container capable of controlling temperature; The two pretreatment containers are connected; The sample detection area includes a plurality of detection units; the detection unit includes a detection dish and a detection probe that can be inserted into the detection dish; the detection probes of different detection units are different; The foam liquid to be tested is placed in a pretreatment container at a first temperature in a high temperature pretreatment unit, then transferred to a pretreatment container at a second temperature in a low temperature pretreatment unit, and finally transferred to several test dishes to be tested by corresponding test probes.

2. The on-site detection device for the physical and chemical properties of foam liquid according to claim 1 is characterized by: The high-temperature pretreatment unit and the low-temperature pretreatment unit both further comprise a pretreatment temperature well, in which the pretreatment container is placed, and the pretreatment temperature well controls the temperature of the pretreatment container.

3. The on-site detection device for the physical and chemical properties of foam liquid according to claim 1 is characterized in that: The high temperature pretreatment unit also includes a liquid nitrogen cylinder; The pretreatment containers of the high-temperature pretreatment unit and the low-temperature pretreatment unit are connected through a liquid guide tube; one end of the liquid guide tube connected to the pretreatment container of the high-temperature pretreatment unit extends into the bottom of the pretreatment container; The liquid nitrogen cylinder is connected to the pretreatment container through a gas pipeline, the pressure of the pretreatment container is increased by inputting nitrogen, and the foam pressure is pressed into the pretreatment container of the low-temperature pretreatment unit through the liquid guide tube; A one-way valve is arranged on the catheter.

4. The on-site detection device for the physical and chemical properties of foam liquid according to claim 3 is characterized by: The high-temperature pretreatment unit also includes a stirrer; the stirrer is arranged in the pretreatment container and stirs the foam liquid when nitrogen is input from the liquid nitrogen cylinder.

5. The on-site detection device for the physical and chemical properties of foam liquid according to claim 3 is characterized by: The low temperature pretreatment unit also includes a liquid nitrogen cylinder, which is connected to the pretreatment container through a gas pipeline. The pressure of the pretreatment container is increased by inputting nitrogen, and the foam is pressed into a plurality of test dishes.

6. The on-site detection device for the physical and chemical properties of foam liquid according to claim 3 is characterized by: The pretreatment container is an openable container with a circular cross section, and its top cover is in the shape of an arc top.

7. The on-site detection device for the physical and chemical properties of foam liquid according to claim 1 is characterized by: The number of the detection units is three, and the detection probes of the three detection units are respectively a pH acidity meter probe, a surface tension meter probe and an interfacial tension meter probe, and the interfacial tension meter probe is also equipped with a cyclohexane injection port.

8. The on-site detection device for the physical and chemical properties of foam liquid according to claim 1 is characterized by: The sample detection area also includes a detection temperature well, which has detection pools corresponding to a plurality of detection dishes one by one. The plurality of detection dishes are placed in the corresponding detection pools, and the detection temperature well controls the temperature of the plurality of detection dishes.

9. The on-site detection device for the physical and chemical properties of foam liquid according to claim 1, characterized in that: The detection unit also includes a mechanical arm; the mechanical arm is arranged above the detection dish to control the lifting and lowering of the detection probe.

10. The detection method of the on-site detection device for the physical and chemical properties of foam liquid according to any one of claims 1 to 9, characterized in that: The temperature of the pretreatment container of the high-temperature pretreatment unit is adjusted to 60°C, and the temperature of the pretreatment container of the low-temperature pretreatment unit is adjusted to 25°C; the foam fire extinguishing agent sample collected on site is poured into the pretreatment container of the high-temperature pretreatment unit, and after standing for 7 days, it is transferred to the pretreatment container of the low-temperature pretreatment unit and stood for 1 day to obtain the sample after temperature pretreatment; Transfer the samples to several test dishes and use the test probes to perform corresponding tests on the samples; The detection probe is a pH acidity meter probe; immerse the pH acidity meter probe into the sample, and read the pH value after it stabilizes for 3 minutes; The detection probe is a surface tension meter probe. Immerse the surface tension meter probe in the sample, stabilize it for 3 minutes, then slowly and evenly lift it up. The maximum pulling force at the moment the surface tension meter probe leaves the liquid surface is the surface tension value. The detection probe is an interfacial tension meter probe; cyclohexane liquid is poured on the sample surface, and the interfacial tension meter probe is immersed in the part below the interface of the two liquids. After stabilization for 3 minutes, it is slowly lifted up at a uniform speed. The maximum tension when the interfacial tension meter probe passes through the interface of the two liquids is the interfacial tension value; Calculate the diffusion coefficient based on the surface tension and interfacial tension: S=γ e -c f -c i ; Where S is the diffusion coefficient, γ e is the surface tension of cyclohexane, γ f is the surface tension of the sample, γ i is the interfacial tension value between the sample and cyclohexane; The tests are performed several times, and the average value of the test results is the measurement result of the sample.

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