A system and method for petroleum chemical water cooler leakage collection

Abstract

The present application relates to the technical field of leakage detection, and discloses a system and method for collecting leakage of a water cooler in a petrochemical industry. The system comprises: a first collecting unit (100) for adsorbing liquid leakage and obtaining a first stream, and the first collecting unit (100) is provided with a circulating water inlet and a first stream outlet; a second collecting unit (200) for collecting gaseous leakage and obtaining a second stream, and the second collecting unit (200) is provided with a second stream outlet, a gaseous leakage outlet, a first stream inlet communicated with the first stream outlet, and a purge gas pipeline (300) arranged in the second collecting unit (200), the purge gas pipeline (300) being used for introducing purge gas to strip the first stream. The collecting system provided by the present application can collect gaseous leakage and liquid leakage at the same time, so that the leakage fingerprint information is more comprehensive.

Description

Technical Field

[0001] This invention relates to the field of leak detection technology, and more specifically to a system and method for collecting leaks from petrochemical water coolers. Background Technology

[0002] Water-cooled heat exchangers (referred to as water coolers) in the circulating water system of an oil refinery are responsible for the heat exchange and cooling of most of the refinery's production units. Due to the long-term operation of the units and the deterioration of crude oil, water coolers may leak materials due to corrosion, perforation, and other reasons.

[0003] If a water cooler leaks, it will cause the circulating water quality to deteriorate, microorganisms to multiply and a large amount of slime to grow, causing blockage of heat exchange equipment, corrosion of other water cooling equipment in the same system, and even causing the unit to shut down, which is extremely harmful to the long-term stable operation of petrochemical units.

[0004] Therefore, there is an urgent need to develop accurate and sensitive detection technology for trace leaks in water coolers, so as to detect leaks early and cut off the source of leaks, and prevent the leaks from continuing to develop and worsen.

[0005] The water cooler materials involved in the entire circulating water system are numerous and complex, including high-boiling-point oils (such as diesel, kerosene, and residual oil) as well as light products (such as methane and liquefied petroleum gas). Monitoring different types of leaks in the circulating water often requires the combination of multiple analytical methods.

[0006] CN206496874U discloses an online leak monitoring instrument for water coolers based on optical fibers. It uses optical fibers to isolate the influence of the temperature of the medium inside the pipe on the optical devices, and adopts the ultraviolet fluorescence method. It incorporates multiple compensation technologies such as dark current, instrument graph, and sample temperature, which greatly improves the accuracy of the detection results. However, this device can only enrich and analyze liquid leaks in circulating water and cannot detect gas leaks.

[0007] CN102279082A discloses an online monitoring method for leaks in petrochemical water coolers. This method combines multiple detection technologies such as ultraviolet spectroscopy, ultraviolet fluorescence, optical fiber, infrared, and gas detectors, which can promptly eliminate safety hazards and save time in locating leaks during major overhauls. However, it consumes significant manpower and material resources in practical applications.

[0008] Therefore, developing a convenient and economical method that can simultaneously collect and detect gaseous and liquid leaks from water cooler circulating water is of great significance to the petrochemical industry. Summary of the Invention

[0009] The purpose of this invention is to solve the problem in the prior art that gaseous and liquid leaks cannot be collected and analyzed simultaneously during water leakage in water coolers.

[0010] To achieve the above objectives, a first aspect of the present invention provides a system for collecting leaks from petrochemical water coolers. This system is used to collect liquid and gaseous leaks from the circulating water of petrochemical water coolers, comprising:

[0011] The first collection unit is used to adsorb the liquid leakage and obtain the first material flow, and the first collection unit is provided with a circulating water inlet and a first material flow outlet.

[0012] The second collection unit is used to collect gaseous leaked material and obtain a second material flow. The second collection unit is provided with a second material flow outlet, a gaseous leaked material outlet, and a first material flow inlet connected to the first material flow outlet. The second collection unit is also provided with a purge gas pipe inside, which is used to introduce purge gas to gasify the first material flow.

[0013] A second aspect of the present invention provides a method for collecting leaks from petrochemical water coolers, the method being performed within the collection system described in the first aspect, comprising:

[0014] (1) Introduce circulating water into the first collection unit to adsorb the liquid leaked material and obtain the first material stream;

[0015] (2) In the presence of purge gas, the first material is introduced into the second collection unit for gas extraction to obtain the second material and gaseous leak.

[0016] In the circulating water, the liquid leak is C. 6-40 Alkanes, C 6-40 Cycloalkanes, C 6-40 Olefins and C 6-40 At least one of aromatic hydrocarbons, wherein the gaseous leaked substance is a C3-C5 volatile hydrocarbon.

[0017] The system for collecting leaks from petrochemical water coolers provided by this invention can simultaneously collect both gaseous and liquid leaks, making the fingerprint information of the leaks more comprehensive.

[0018] In particular, the acquisition system provided by this invention provides accurate test results, is easy to carry and operate, and can greatly save labor costs; moreover, no organic solvents are required during the extraction process, making it green and economical. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the petrochemical water cooler leakage collection system of the present invention;

[0020] Figure 2 This is a total ion map of gaseous leaked substances in circulating water catalytic oil and gas, obtained using the method of this invention;

[0021] Figure 3 This is a total ion map of liquid leaks in circulating water catalytic oil and gas obtained using the method of this invention;

[0022] Figure 4 This is a total ion map of atmospheric and vacuum diesel and catalytic diesel in circulating water, obtained using the method of this invention;

[0023] Figure 5 This is a total ion diagram of catalytic oil and gas, atmospheric and vacuum diesel, and catalytic diesel in circulating water, obtained by the purge and trap method.

[0024] Figure 6 It is a total ion diagram of catalytic oil and gas, atmospheric and vacuum diesel, and catalytic diesel in circulating water, obtained by solid-phase microextraction.

[0025] Explanation of reference numerals in the attached figures

[0026] 100, First Acquisition Unit; 200, Second Acquisition Unit

[0027] 201. Receiving tube I 202. Receiving tube II

[0028] 300. Purge pipes; 301. Bubbling board.

[0029] 400, Drying unit 500, Filtering unit

[0030] 600, Flow meter 700, Gas collector

[0031] 800, Inlet regulating valve; 900, Outlet regulating valve Detailed Implementation

[0032] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0033] The following is in conjunction with the invention provided Figures 1 to 6 The acquisition system and acquisition method described in this invention will be described in detail.

[0034] As previously described, a first aspect of the present invention provides a system for collecting leaks from petrochemical water coolers. This system is used to collect liquid and gaseous leaks from the circulating water of a petrochemical water cooler, comprising:

[0035] The first collection unit 100 is used to adsorb liquid leakage and obtain a first material flow, and the first collection unit 100 is provided with a circulating water inlet and a first material flow outlet.

[0036] The second collection unit 200 is used to collect gaseous leaked material and obtain a second material flow. The second collection unit 200 is provided with a second material flow outlet, a gaseous leaked material outlet, and a first material flow inlet connected to the first material flow outlet. The second collection unit 200 is also provided with a purge gas pipe 300 inside, which is used to introduce purge gas to gasify the first material flow.

[0037] To ensure that the circulating water is thoroughly purged without generating excessive air pressure, the distance between the bottom of the purging air pipe 300 and the bottom of the second collection unit 200 is preferably 0.5-2cm, and more preferably 1-2cm.

[0038] Preferably, there is at least one purging gas pipe 300, and more preferably one pipe.

[0039] Preferably, the bottom of the purge gas pipe 300 is further provided with a bubbler plate 301 for forming bubbles in the purge gas.

[0040] Preferably, the bubbling plate 301 has a plurality of through holes evenly distributed on it (not shown in the figure).

[0041] In order to increase the contact area between the purging gas and the water and fully blow out the hydrocarbons in the water, the average diameter of the through hole is preferably 10-100 μm.

[0042] Preferably, the purging gas is selected from inert gas and / or compressed air.

[0043] Preferably, the second collection unit 200 includes a fixedly connected receiving tube I 201 and a receiving tube II 202, the gaseous leak outlet is disposed on the receiving tube I 201, and the second material outlet is disposed at the bottom of the receiving tube II 202.

[0044] In this invention, after the first material is introduced into the second collection unit 200, it can flow continuously in the receiving tube II 202 and undergo air lifting under the action of purge gas. The receiving tube I 201 can prevent the circulating water from splashing due to the impact of air lifting.

[0045] In a preferred embodiment, the receiving tube I 201 is a spherical tube, and the receiving tube II 202 is a cylindrical tube.

[0046] To ensure that the second acquisition unit 200 can achieve continuous large-volume sampling of volatile gaseous leaks in circulating water, different sizes of receiving tubes I 201 and II 202 can be designed as needed. For example, the volume of receiving tube I 201 in this invention is 0.05-0.5L, and the diameter of receiving tube II 202 is 1-5cm, the volume is 0.01-0.5L, and the height is 10-20cm.

[0047] More preferably, the receiving tube II 202 is also provided with scale lines.

[0048] Preferably, the first acquisition unit 100 is a solid-phase microextraction tube with a hollow tubular structure.

[0049] Preferably, the inner wall of the solid-phase microextraction tube is provided with an adsorbent material.

[0050] Preferably, the adsorbent material is selected from at least one of polydimethylsiloxane, polyacrylic acid, polyethylene glycol, carbon molecular sieve, carbon nanotube, graphene, aluminum oxide, and divinylbenzene.

[0051] The present invention does not have any special requirements on the size of the solid phase microextraction tube. A solid phase microextraction tube of a reasonable size can be designed as needed. For example, the diameter of the inner cavity of the solid phase microextraction tube is 1-5 mm, preferably 3 mm; and the length is 2-5 cm.

[0052] According to a particularly preferred embodiment of the present invention, the solid-phase microextraction tube is a solid-phase microextraction tube purchased from Qingdao Zhenzheng Company or a solid-phase microextraction tube purchased from Sulpeco Company of the United States.

[0053] Preferably, the system further includes:

[0054] A drying unit 400 is used to dry the gaseous leak, the drying unit 400 is connected to the outlet of the gaseous leak, and the interior of the drying unit 400 is filled with a desiccant.

[0055] Preferably, the desiccant is selected from at least one of calcium chloride, activated alumina, molecular sieve, and silica gel.

[0056] The present invention does not have any particular requirements on the type of drying unit 400, and dryers known in the art can be used.

[0057] Preferably, a gas collector 700 and / or a gas detector are provided at the gas outlet of the drying unit 400. The gas collector 700 is used to collect gaseous leaks, and the gas detector is used to test the gas outlet concentration.

[0058] Preferably, the gas collector 700 is a gas bag or a suma canister.

[0059] Preferably, the system further includes:

[0060] Filter unit 500, the filter unit 500 being used to remove solid particles from circulating water;

[0061] A flow meter 600 is disposed between the filter unit 500 and the first acquisition unit 100 and is used to test the inlet flow rate of circulating water.

[0062] The present invention does not have any particular requirements on the type of the filter unit 500. Filter devices known in the art can be used. For example, the filter unit 500 is a PVC transparent Y-type filter device purchased from Tianjin Hammond Company, with a filter screen of 100 mesh.

[0063] The following combination Figure 1 The structure shown describes in detail a preferred embodiment of the present invention for collecting leaks from petrochemical water coolers.

[0064] Circulating water from the refinery enters the collection pipeline. The inlet water regulating valve 800 adjusts the inlet flow rate of the circulating water. The circulating water is then transported to the filtration unit 500, which removes solid slime particles from the circulating water. The flow rate of the circulating water is measured using a flow meter 600. The circulating water is then transported to the first collection unit 100, where liquid leaks are adsorbed by the adsorption material inside the first collection unit 100, resulting in a first stream. The first stream is then transported to the second collection unit 200, where it flows continuously in the receiving pipe II 202 and is discharged from the second stream outlet of the receiving pipe II 202 through the outlet regulating valve 900. Simultaneously, purge air is introduced into the purge air pipeline 300. Under the action of the bubbler plate 301, the purge air forms uniform bubbles and blows them out, thus airlifting the first stream. The airlifted gaseous leaks are then transported to the drying unit 400 through the gaseous leak outlet, and finally to the gas collector 700.

[0065] The system for collecting leaks from petrochemical water coolers provided by this invention also has the following specific advantages:

[0066] (1) It breaks through the limitation of existing sampling technology that can only collect some of the leaked substances in circulating water. It can collect both volatile gaseous hydrocarbons and water-insoluble liquid hydrocarbons, making the hydrocarbon fingerprint information of the leaked substances more comprehensive.

[0067] (2) The collection system does not require carrying large volume water samples, is easy to operate, saves labor costs, and does not require organic solvents during the extraction process, making it green and economical.

[0068] As previously described, a second aspect of the present invention provides a method for collecting leaks from petrochemical water coolers, the method being performed within the collection system described in the first aspect, comprising:

[0069] (1) Introduce circulating water into the first collection unit to adsorb the liquid leaked material and obtain the first material stream;

[0070] (2) In the presence of purge gas, the first material is introduced into the second collection unit for gas extraction to obtain the second material and gaseous leak.

[0071] In the circulating water, the liquid leak is C. 6-40 Alkanes, C 6-40 Cycloalkanes, C 6-40 Olefins and C 6-40 At least one of aromatic hydrocarbons, wherein the gaseous leaked substance is a C3-C5 volatile hydrocarbon.

[0072] Preferably, in the circulating water, the liquid leak is selected from at least one of dodecane, tridecane, tetradecane, pentadecane, hexadecane, benzene substituted with C1-C4 alkyl groups, substituted or unsubstituted naphthalene, wherein the substituent is a C1-C3 alkyl group.

[0073] Preferably, in the circulating water, the gaseous leak is selected from at least one of propylene, isobutane, n-butane, 2-butene, 2-methylbutane, and n-pentane.

[0074] Preferably, in step (1), the flow rate of the circulating water is 0.1-1 L / min.

[0075] The present invention does not have any special requirements for the adsorption treatment operation described in step (1), as long as the requirements of the present invention are met. For example, at room temperature, the circulating water flows continuously until 5-10L of water flows through, and the adsorption treatment is completed.

[0076] Preferably, in step (2), the flow rate of the purge gas is 50-100 mL / min.

[0077] The present invention will be described in detail below through examples.

[0078] In the following examples, the circulating water used was collected in December 2021 from the circulating water inlet pipe of a catalytic cracking unit in a refinery. The water was clear and transparent, and no petroleum hydrocarbons were detected by gas chromatography-mass spectrometry. This circulating water was used as blank circulating water, and 100 mg / L of catalytic oil and gas, 100 mg / L of atmospheric and vacuum diesel oil, and 100 mg / L of catalytic diesel oil were added to it respectively.

[0079] First acquisition unit: solid phase microextraction tube, with an inner cavity diameter of 3mm and a length of 3cm. The adsorbent material on the inner wall is polydimethylsiloxane with a thickness of 60μm, purchased from Qingdao Zhenzheng Company.

[0080] In the following examples, there is only one purging pipe;

[0081] The receiving tube I is a spherical tube with a volume of 0.1L, made of glass;

[0082] The receiving tube II is a cylindrical glass tube with a volume of 0.1L and a diameter of 3cm;

[0083] The dryer is a spherical drying tube, and the desiccant inside is silica gel;

[0084] In the following examples, unless otherwise stated, the purging gas is nitrogen;

[0085] Gas collector: gas bag, 1L capacity, purchased from Dalian Haide Technology Co., Ltd.;

[0086] Thermal desorption tube: 1 / 4 inch in diameter, 3.5 inches in length, model number 495094, purchased from MARKES, UK;

[0087] In the following examples, unless otherwise stated, the gas chromatography-mass spectrometry analyzer is model 8890 / 5977B, purchased from Agilent Technologies.

[0088] The chromatographic conditions were as follows: HP-PONA capillary column (50m × 0.2mm × 0.25μm); injection port temperature 260℃; split ratio 5:1; column temperature program: initial column temperature 40℃, hold for 5 min, then increase to 320℃ at a rate of 5℃ / min. The mass spectrometry conditions were as follows: EI source, electron energy 70eV, ion source temperature 230℃; MS quadrupole 150℃; transfer line temperature 280℃; acquisition mode: full scan; scan mass range: (5~300) amu.

[0089] Example 1

[0090] use Figure 1 The structure (or process) shown is used to collect leaks from petrochemical water coolers.

[0091] Circulating water from the refinery enters the collection pipeline. The inlet flow rate is adjusted by the inlet regulating valve 800. The circulating water is then transported to the filtration unit 500, which removes solid slime particles. The inlet flow rate is measured to be 0.5 L / min using a flow meter 600. The circulating water is then transported to the first collection unit 100, where liquid leaks are adsorbed by the adsorption material, resulting in a first stream. This first stream is then transported to the second collection unit 202, where it flows continuously through the receiving pipe II 202 and exits from the receiving pipe II. The second material outlet of 202 is discharged through the water outlet regulating valve 900. Simultaneously, purge gas is introduced into the purge gas pipeline 300 at a flow rate of 0.05 L / min. Under the action of the bubbler plate 301 (the average diameter of the through holes on the bubbler plate is 50 μm), the purge gas forms uniform bubbles that are blown out and gas-lift the first material. The gaseous leak obtained from the gaseous leak is transported to the drying unit 400 through the gaseous leak outlet. The dried gaseous leak is then transported to the gas collector 700. The sampling time is recorded, starting from the opening of the water inlet regulating valve 800.

[0092] The formula for calculating the volume of the water sample is: V = μt;

[0093] V represents the volume of the water sample, in L;

[0094] μ indicates the inlet flow rate of the circulating water tested by the flow meter 600, in L / min;

[0095] t represents the sampling time, in minutes;

[0096] In this embodiment, t is 15 min, and the water sample volume is 0.5 L / min × 15 min = 7.5 L.

[0097] The liquid leaks adsorbed in the first acquisition unit 100 and the gaseous leaks in the gas collector 700 were analyzed by chromatography-mass spectrometry. The specific analysis results are shown in Table 1 and Table 2.

[0098] The preparation method for the liquid leakage sample is as follows: After sampling, remove the solid phase microextraction tube and place it into the thermal desorption tube; then insert the thermal desorption tube into the thermal desorption instrument's thermal desorption component and tighten it; turn on the thermal desorption instrument (model Centri, purchased from Markes), heat to 250°C for 2 minutes, maintain this temperature for 5 minutes for thermal desorption; start the gas chromatography-mass spectrometry analyzer for analysis.

[0099] The present invention also provides, by way of example, total ion maps of gaseous and liquid leaks in circulating water obtained by the method of the present invention, as shown in the figures below. Figures 2-4 .

[0100] in, Figure 2 This is a total ion map of gaseous leaked substances in circulating water catalytic oil and gas, obtained using the method of this invention. Figure 3 This is a total ion map of liquid leaks in circulating water catalytic oil and gas obtained using the method of this invention. Figure 4 Figure 4a shows the total ion diagrams of atmospheric and vacuum diesel and catalytic diesel in circulating water obtained by the method of the present invention, and Figure 4b shows the total ion diagram of catalytic diesel in circulating water obtained by the method of the present invention.

[0101] from Figures 2-4 As can be seen from the above, the method provided by this invention can simultaneously collect volatile hydrocarbons with a total carbon atom count of C3-C5 and liquid hydrocarbons with a total carbon atom count of C6 or more that are insoluble in water.

[0102] Comparative Example 1

[0103] Leaked substances in the circulating water were collected using the purge-and-trap method, and analyzed by chromatography-mass spectrometry. Specific analytical results are shown below. Figure 5 .

[0104] The purge and trap method was performed on the commercial instrument ATOMX solid-liquid phase purge and trap concentration injector. The sample solution was poured into a 40mL injection bottle, and after overflow, it was sealed. The autosampler took 5mL of water sample for purge and trap treatment.

[0105] The process parameters for the purge and trap treatment are as follows: the purge gas is helium (purity 99.999%), the purge tube volume is 5 mL, the purge temperature is room temperature, the purge flow rate is 40 mL / min, the purge time is 10 min, the pre-desorption temperature is 180℃, the pre-desorption time is 1 min, the desorption temperature is 190℃, the desorption time is 2 min, the baking temperature is 200℃, the baking time is 6 min, and the transfer line temperature is 150℃.

[0106] Figure (5a) is a total ion diagram of catalytic oil and gas collected in circulating water by the purge and trap method; Figure (5b) is a total ion diagram of atmospheric and vacuum diesel collected in circulating water by the purge and trap method; and Figure (5c) is a total ion diagram of catalytic diesel collected in circulating water by the purge and trap method.

[0107] from Figure 5 As can be seen from the data, the purge and trap method can detect light hydrocarbon components in oil and gas, but for heavy oil products such as atmospheric and vacuum diesel and relatively light catalytic light diesel, fewer types of components can be detected. This result indicates that the purge and trap method is suitable for analyzing light oil spills in water, but not suitable for analyzing oil spills with more heavy components.

[0108] Comparative Example 2

[0109] Leakage substances in the circulating water were collected using solid-phase microextraction and analyzed by chromatography-mass spectrometry. Specific analytical results are shown below. Figure 6 .

[0110] Solid-phase microextraction (SPME) was performed on a CTC autosampler. SPME mode was selected, and 19 mL of water sample was added to a 20 mL headspace vial. The solid-phase probe was inserted into the water sample, and extraction was performed at 40°C with shaking for 40 min. The probe was then inserted into the chromatographic inlet, and desorption was performed at 260°C for 3 min. The desorbed gas was analyzed using a gas chromatography-mass spectrometry (GC-MS) analyzer. The carrier gas was helium (99.999% purity). The SPME probe was purchased from Sulpeco, and the coating material was PDMS with a thickness of 100 μm. The probe size was 24 g.

[0111] Figure (6a) is a total ion diagram of catalytic oil and gas collected in circulating water by solid-phase microextraction, Figure (6b) is a total ion diagram of atmospheric and vacuum diesel collected in circulating water by solid-phase microextraction, and Figure (6c) is a total ion diagram of catalytic diesel collected in circulating water by solid-phase microextraction.

[0112] from Figure 6 As can be seen, the test results obtained by solid phase microextraction are less accurate and the collected leaked material is not comprehensive enough.

[0113] Table 1: Analysis Results of Liquid Leakage from Catalytic Oil and Gas in Circulating Water

[0114] 1 15.264 <![CDATA[C8H 10 ]]> 100-41-4 Ethylbenzene 26.7 2 15.630 <![CDATA[C8H 10 ]]> 108-38-3 xylene 100 3 16.530 <![CDATA[C8H 10 ]]> 106-42-3 xylene 42.54 4 18.835 <![CDATA[C9H 12 ]]> 103-65-1 propylbenzene 5.03 5 19.111 <![CDATA[C9H 12 ]]> 611-14-3 Cumene 24.31 6 19.183 <![CDATA[C9H 12 ]]> 622-96-8 1-Ethyl-4-methyl-benzene 9.59 7 19.373 <![CDATA[C9H 12 ]]> 108-67-8 Trimethylbenzene 10.86 8 20.342 <![CDATA[C9H 12 ]]> 526-73-8 Trimethylbenzene 42.1 9 21.802 <![CDATA[C9H 12 ]]> 300-57-2 2-Propylene 10.73 10 22.021 <![CDATA[C9H8]]> 2327-99-3 styrene 1.93 11 22.33 <![CDATA[C 10 H 14 ]]> 1074-43-7 3-Methylpropene 3.28 12 22.54 <![CDATA[C 10 H 14 ]]> 874-41-9 2,4-Dimethyl-ethylbenzene 5.14 13 22.912 <![CDATA[C 10 H 14 ]]> 135-98-8 1-Methylpropylbenzene 1.5 14 23.226 <![CDATA[C 10 H 14 ]]> 1758-88-9 2,5-Dimethyl-ethylbenzene 3.47 15 23.507 <![CDATA[C 10 H 14 ]]> 934-74-7 3,5-Dimethyl-ethylbenzene 5.68 16 23.597 <![CDATA[C 10 H 12 ]]> 767-58-8 1-Methyl-indane 3.14 17 24.735 <![CDATA[C 10 H 14 ]]> 95-93-2 1,2,3,5-Tetramethylbenzene 3.91 18 25.35 <![CDATA[C 10 H 12 ]]> 824-22-6 2-Ethyl-1,3-Dimethylbenzene 4.45 19 25.702 <![CDATA[C 10 H 12 ]]> 1587-04-8 1-Methyl-2-(2-propenyl)-benzene 6.36 20 25.797 <![CDATA[C 10 H 14 ]]> 95-93-2 1,2,4,5-Tetramethylbenzene 4.36 21 26.745 <![CDATA[C 10 H8]]> 91-20-3 Naphthalene 24.03 22 30.136 <![CDATA[C 11 H 10 ]]> 91-57-6 2-Methylnaphthalene 3.02 23 30.850 <![CDATA[C 11 H 10 ]]> 90-12-0 1-Methylnaphthalene 2.1

[0115] Table 2: Analysis Results of Liquid Leakage from Atmospheric and Vacuum Diesel in Circulating Water

[0116]

[0117]

[0118] As can be seen from the results in Tables 1 and 2, the test results obtained by using the method provided by this invention are more accurate, and the fingerprint information of the leaked material obtained is more comprehensive.

[0119] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A system for collecting leaks from petrochemical water coolers, characterized in that, This system is used to collect liquid and gaseous leaks in the circulating water of petrochemical water coolers, containing: The first collection unit (100) is used to adsorb liquid leakage and obtain a first material flow, and the first collection unit (100) is provided with a circulating water inlet and a first material flow outlet; The second collection unit (200) is used to collect gaseous leaks and obtain a second material flow. The second collection unit (200) is provided with a second material flow outlet, a gaseous leak outlet, and a first material flow inlet connected to the first material flow outlet. The second collection unit (200) is also provided with a purge gas pipe (300) inside. The purge gas pipe (300) is used to introduce purge gas to gas-lift the first material flow. The second collection unit (200) includes a fixedly connected receiving tube I (201) and a receiving tube II (202). The gaseous leak outlet is located on the receiving tube I (201), and the second material outlet is located at the bottom of the receiving tube II (202). The receiving tube I (201) is a spherical tube, and the receiving tube II (202) is a cylindrical tube. The first material flows continuously in the receiving pipe II (202) and is discharged from the second material outlet of the receiving pipe II (202) through the water outlet regulating valve (900).

2. The data acquisition system according to claim 1, wherein, The distance between the bottom of the purge gas pipe (300) and the bottom of the second acquisition unit (200) is 0.5-2cm.

3. The data acquisition system according to claim 2, wherein, The distance between the bottom of the purge gas pipe (300) and the bottom of the second collection unit (200) is 1-2 cm.

4. The data acquisition system according to claim 1, wherein, The purge gas pipe (300) is at least one.

5. The data acquisition system according to claim 4, wherein, The number of purge gas pipes (300) is 1-3.

6. The data acquisition system according to any one of claims 1-5, wherein, The bottom of the purge gas duct (300) is also provided with a bubbler plate (301) for forming bubbles in the purge gas.

7. The data acquisition system according to claim 6, wherein, The bubbling plate (301) has multiple through holes evenly distributed on it.

8. The data acquisition system according to claim 7, wherein, The average diameter of the through hole is 10-100 μm.

9. The data acquisition system according to any one of claims 1-5, wherein, The purging gas is selected from inert gas and / or compressed air.

10. The data acquisition system according to any one of claims 1-5, wherein, The first acquisition unit (100) is a solid phase microextraction tube with a hollow tubular structure.

11. The data acquisition system according to claim 10, wherein, The inner wall of the solid-phase microextraction tube is provided with an adsorption material.

12. The data acquisition system according to claim 11, wherein, The adsorbent material is selected from at least one of polydimethylsiloxane, polyacrylic acid, polyethylene glycol, carbon molecular sieve, carbon nanotube, graphene, aluminum oxide, and divinylbenzene.

13. The data acquisition system according to any one of claims 1-5, wherein, The system also includes: A drying unit (400) is used to dry the gaseous leak, the drying unit (400) is connected to the outlet of the gaseous leak and the interior of the drying unit (400) is filled with a desiccant.

14. The data acquisition system according to claim 13, wherein, The desiccant is selected from at least one of calcium chloride, activated alumina, molecular sieve, and silica gel.

15. The data acquisition system according to any one of claims 1-5, wherein, The system also includes: A filter unit (500) is used to remove solid particles from circulating water; A flow meter (600) is disposed between the filter unit (500) and the first acquisition unit (100) for testing the inlet flow rate of circulating water.

16. A method for collecting leaks from petrochemical water coolers, characterized in that, The method is performed in the acquisition system according to any one of claims 1-15, and includes: (1) Introduce circulating water into the first collection unit to adsorb the liquid leaked material and obtain the first material stream; (2) In the presence of purge gas, the first material is introduced into the second collection unit for gas extraction to obtain the second material and gaseous leak; In the circulating water, the liquid leak is C. 6-40 Alkanes, C 6-40 Cycloalkanes, C 6-40 Olefins and C 6-40 At least one of aromatic hydrocarbons, wherein the gaseous leaked substance is a C3-C5 volatile hydrocarbon.

17. The acquisition method according to claim 16, wherein, In the circulating water, the liquid leak is selected from at least one of dodecane, tridecane, tetradecane, pentadecane, hexadecane, benzene substituted with C1-C4 alkyl groups, substituted or unsubstituted naphthalene, wherein the substituent is a C1-C3 alkyl group.

18. The data acquisition method according to claim 16, wherein, In the circulating water, the gaseous leak is selected from at least one of propylene, isobutane, n-butane, 2-butene, 2-methylbutane, and n-pentane.

19. The data acquisition method according to any one of claims 16-18, wherein, In step (1), the flow rate of the circulating water is 0.1-1 L / min.

20. The data acquisition method according to any one of claims 16-18, wherein, In step (2), the flow rate of the purge gas is 50-100 mL / min.

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