Real-time collection device and method for deep water layer VSCs gas

Abstract

The invention discloses a real-time collection device and method for deepwater layer VSCs gas, and belongs to the technical field of sewage treatment.The real-time collection device comprises a gas collection assembly used for collecting the deepwater layer VSCs gas; the gas conveying assembly is connected with the gas collecting assembly through a first connecting pipe so as to convey inert gas into the gas collecting assembly; the gas collecting assembly is connected with the gas collecting assembly through a second connecting pipe, and gas in the gas collecting assembly is collected; the first connecting pipe and the second connecting pipe are each provided with a switch valve. According to the method, in-situ pressure-maintaining collection of the VSCs in the deep water layer of the sewage treatment plant is realized, original components of gas can be completely reserved, precision equipment is protected, the cost is low, the application scene is wide, and accurate data support is provided for odor pollution control.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment, and particularly relates to a device and method for real-time collection of VSCs gas in deep water layer. BACKGROUND

[0002] At present, the research on volatile sulfide (VSCs) gas of sewage treatment plant structures mainly focuses on the monitoring of water surface release flux, and the research and collection work on the release characteristics of VSCs in deep water layer still lacks targeted and specific methods. Due to the significant hydrostatic pressure in the deep water layer environment of the sewage treatment plant structure pool body, the conventional water surface gas collection method is completely inapplicable, and the sampling technology capable of realizing in-situ collection of deep water layer and effectively preserving the original physical state and chemical component characteristics of the gas during the process is currently extremely lacking.

[0003] The existing gas collection methods are mainly designed for water surface or atmospheric environment. These methods do not consider the underwater pressure environment in the design principle, so they are difficult to apply to the collection of deep water layer VSCs gas which requires in-situ capture of gas and minimizes the loss of components. For example, the commonly used static box method, gas bag method and improved real-time collection device appeared in recent years all have fundamental limitations. The static box method is to invert the box (without cover) on the water surface, and rely on the accumulated gas in the box released by the water body. By extracting the gas in the box at fixed intervals and measuring the concentration, the gas release flux of the water surface is calculated. Although the operation is simple, the sampling interface is strictly limited to the gas-water interface, and it is impossible to reach the deep water layer. In addition, the box material may adsorb VSCs, resulting in distorted measurement results. The gas bag method places a vacuumized gas bag in a water surface frame, and relies on negative pressure to suck in the released gas. Although a larger volume of sample can be obtained, it is also limited to water surface collection. More importantly, the adsorption effect of gas bag material on VSCs is usually more significant than that of rigid box, which is particularly unfavorable for the measurement of low concentration gas.

[0004] In addition, the real-time collection device disclosed in the patent document (CN114314868A) represents the advanced level of water surface gas collection technology. By using inert pipeline (such as polytetrafluoroethylene), Summa Can and real-time electronic flow meter, the adsorption loss is effectively reduced, and the accurate measurement of gas release rate is realized. However, the core design of this device is based on the floating principle, and its overall structure does not have pressure resistance and water tightness, which makes it unable to sink to the deep water layer. In deep water environment, the hydrostatic pressure will directly crush the collection box and connecting pipeline, making it completely ineffective.

[0005] The prior art cannot be applied to the deep water layer of the sewage treatment plant structure due to the limitation of the sampling position to the water surface and the inability to overcome the hydrostatic pressure in the structure design. Therefore, developing a special sampling device and method capable of in-situ, pressure-maintaining and low-disturbance collection of VSCs gas in a water body with a large depth and hydrostatic pressure, and effectively maintaining the original component characteristics of the gas is a technical gap to be solved in the field. SUMMARY

[0006] To achieve the above purpose, the present application provides a real-time collection device and method for deep water layer VSCs gas, which adopts the following technical scheme: A real-time collection device for deep water layer VSCs gas, comprising: a gas collection assembly for collecting deep water layer VSCs gas; a gas delivery assembly connected to the gas collection assembly through a first connecting pipe to deliver inert gas into the gas collection assembly; a gas collection assembly connected to the gas collection assembly through a second connecting pipe to collect the gas in the gas collection assembly; wherein the first connecting pipe and the second connecting pipe are both provided with a switch valve.

[0007] Further, the gas collection assembly comprises a fourth pull rope, a control bolt, a first pull rope, a spring, a sealing cover, a second pull rope, a third pull rope, a counterweight, a floating ball valve and a sampling cylinder; the bottom of the sampling cylinder is provided with an opening, the top of the sampling cylinder is connected to the gas delivery assembly through the first connecting pipe and connected to the gas collection assembly through the second connecting pipe; the sealing cover is connected to the opening through a hinge, the sealing cover is provided with a pull rope hole opposite to the hinge on the sealing cover; the first end of the spring is connected to the middle part of the outer wall of the sampling cylinder, and the other end is connected with a smooth ring; the bottom of the sampling cylinder is provided with a control bolt insertion hole; the first end of the control bolt is inserted into the control bolt insertion hole, and the second end passes through the smooth ring and is connected with the first pull rope; the counterweight is connected to the bottom of the sampling cylinder through the third pull rope; one end of the second pull rope is connected with the pull rope hole, and the other end is connected with the smooth ring.

[0008] Further, the outer side of the sealing cover is connected with a rubber plug.

[0009] Further, the gas delivery assembly comprises a nitrogen cylinder and a first gas flow meter; the nitrogen cylinder is connected to the top of the sampling cylinder through the first connecting pipe; and the first gas flow meter is installed on the first connecting pipe.

[0010] Further, the gas collection assembly comprises a second gas flow meter, a third connecting pipe, a fourth connecting pipe, a three-way valve, a first gas ball valve, and a second gas ball valve. The first end of the second connecting pipe is connected to the first end of the third connecting pipe through the three-way valve, the second end of the second connecting pipe is connected to the sampling cylinder and extends into the sampling cylinder, and the second end of the second connecting pipe is connected to a float ball valve.

[0011] Further, in the present embodiment, the gas collection assembly comprises a surge tank, and the surge tank is connected to the second end of the third connecting pipe.

[0012] Further, the gas collection assembly further comprises a flow limiting valve, which is installed on the third connecting pipe and arranged between the second gas flow meter and the surge tank.

[0013] Further, the first connecting pipe, the second connecting pipe, the third connecting pipe, and the fourth connecting pipe are all made of PTFE.

[0014] Further, the top of the sampling cylinder is connected to a fourth pull rope for pulling the entire sampling cylinder to move.

[0015] Further, a collection method for deep water layer VSCs gas, characterized by the collection method of any one of the real-time collection devices for deep water layer VSCs gas, the collection method comprising the following steps: S1, sinking the gas sampling cylinder in a sealed state to a specified depth in the water body; S2, remotely triggering the control bolt mechanism through the first pull rope and the second pull rope to release the spring and pull the sealing cover to open the bottom opening of the sampling cylinder body; S3, the original gas in the sampling cylinder is discharged, and the deep water layer liquid carries the bubbles into the sampling cylinder, and the liquid level rises to a predetermined height, and the float ball valve is automatically closed; S4, injecting nitrogen into the sampling cylinder through the nitrogen cylinder, purging and replacing the remaining space in the sampling cylinder and the connecting pipeline, after the replacement is completed, closing the first gas ball valve, disconnecting the fourth connecting pipe from the atmosphere, continuing to inject a certain amount of nitrogen, closing the switch of the nitrogen cylinder, and stopping the injection of ammonia; S5, opening the second gas ball valve, adjusting the flow limiting valve to set the collection time, and collecting the deep water layer gas sample in the sampling cylinder into the surge tank by using the negative pressure of the surge tank. S6, according to the volume of the collected gas, concentration and collection time, according to the formula V=c x Q / t to calculate the release rate, wherein: V-VSCs release rate, mg / min; c-VSCs concentration collected in the canister, mg / m 3 ; Q-total volume of gas measured by the second gas flow meter, m 3 ; t-time measured by the second gas flow meter, min; The release flux is calculated by the formula F=c x (Q / t) / S, wherein: F-VSCs release flux, mg / (m 2 ·min); c-VSCs concentration collected in the canister, mg / m 3 ; Q-total volume of gas measured by the second gas flow meter, m 3 ; t-time measured by the second gas flow meter, min; S-bottom area of the box, m 2 .

[0016] The present application provides a kind of for deep water layer VSCs gas real-time collection device and method with the following beneficial effects: (1) the device and method of the present application effectively avoid the shortcomings that traditional static box method, air bag method and other water surface sampling techniques cannot collect VSCs gas in deep water layer of sewage treatment plant structure.The main advantages of the device and method of the present application compared with traditional static box method, air bag method are that the device uses counterweight to make pressure-resistant collection cylinder sink, and opens sampling port at specified depth by pulling rope mechanism, realizes deep water layer in-situ gas collection, is not affected by hydrostatic pressure;While traditional static box method, air bag method and other sampling points are strictly limited to water surface, structure design cannot overcome deep water static pressure, which leads to that they cannot touch and collect gas samples in deep water layer.

[0017] (2) The device and method of the present application can directly collect deep water layer gas in situ and effectively maintain its original physical state and chemical components. In the traditional water surface sampling method, the pipeline and gas bag material may adsorb VSCs components during the sampling process, and air dilution and oxidation of the sample cannot be avoided, so that the collected gas sample cannot perfectly maintain its original component characteristics. In contrast, the sampling device and method of the present application use fully inert pipeline and storage system, and use nitrogen to purge and replace the sampling space and pipeline before sampling, effectively excluding air interference and preventing the adsorption and reaction of VSCs; at the same time, the pressure-resistant structure enables the gas to maintain the physical state near the original site during the collection process, thereby maximizing the preservation of the original component characteristics of the gas sample.

[0018] (3) The device and method of the present application introduce a floating ball valve design. When the liquid enters the sampling cylinder to a predetermined height, the floating ball valve automatically closes, physically blocking the liquid from continuing to enter the PTFE connecting pipe and the Suma tank, without the need for manual liquid level judgment, with high reliability, and more protection for the rear-end equipment, preventing the entry of corrosive sewage into the precise flow meter, valve and Suma tank, causing equipment damage and cross contamination. At the same time, it avoids mixing of liquid sample into gas sample, ensures the purity of the collected gas, simplifies the subsequent analysis process, and improves the data quality.

[0019] (4) The device and method of the present application have small size, simple composition and low cost. It can collect various deep water layer gas samples in different environments, and accurately quantify the diffusion flux of various gases per unit area of deep water layer. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the real-time collection device for deep water layer VSCs gas of the present application; Figure 2 is a top view of the sealing cover of the real-time collection device for deep water layer VSCs gas of the present application; Figure 3 is a front view of the sealing cover of the real-time collection device for deep water layer VSCs gas of the present application; Figure 4 is a side view of the sealing cover of the real-time collection device for deep water layer VSCs gas of the present application; Figure 5 is a top view of the sampling cylinder of the real-time collection device for deep water layer VSCs gas of the present application; Figure 6 is a front view of the sampling cylinder of the real-time collection device for deep water layer VSCs gas of the present application; Figure 7 is a side view of the sampling cylinder of the real-time collection device for deep water layer VSCs gas of the present application; Wherein, 1, nitrogen cylinder; 2, the first gas flow meter; 3, the first pull rope; 4, control bolt; 5, spring; 6, opening; 7, the second pull rope; 8, the third pull rope; 9, counterweight; 10, float ball valve; 11, the fourth pull rope; 12, sampling cylinder; 13, the second connecting pipe; 14, three-way valve; 15, the first gas ball valve; 16, the second gas ball valve; 17, the second gas flow meter; 18, flow limiting valve; 19, suoma jar; 20, rubber plug; 21, sealing cover; 22, control bolt jack; 23, hinge; 24, the fourth connecting pipe; 25, pull rope hole; 26, smooth round ring; 27, the first connecting pipe; 28, the third connecting pipe. DETAILED DESCRIPTION

[0021] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0022] Example 1

[0023] Reference Figures 1 to 7 A real-time collection device for deep water VSCs gas, comprising: A gas collection assembly for collecting deep water VSCs gas; A gas delivery assembly, the gas delivery assembly is connected with the gas collection assembly through the first connecting pipe 27 to deliver inert gas into the gas collection assembly; A gas collection assembly, the gas collection assembly is connected with the gas collection assembly through the second connecting pipe 13 to collect the gas in the gas collection assembly; Wherein, the first connecting pipe 27 and the second connecting pipe 13 are both provided with a switch valve.

[0024] In the embodiment, the gas collecting assembly comprises the fourth pull rope 11, the control bolt 4, the first pull rope 3, the spring 5, the sealing cover 21, the second pull rope 7, the third pull rope 8, the counterweight 9, the float valve 10 and the sampling cylinder 12; the bottom of the sampling cylinder 12 is provided with the opening 6, the top of the sampling cylinder 12 is connected with the gas conveying assembly through the first connecting pipe 27 and connected with the gas collecting assembly through the second connecting pipe 13; the sealing cover 21 is connected at the opening 6 through the hinge 23, the sealing cover 21 is provided with the pull rope hole 25, the pull rope hole 25 and the hinge 23 are oppositely arranged on the sealing cover 21; the first end of the spring 5 is connected with the middle part of the outer wall of the sampling cylinder 12, the other end is connected with the smooth ring 26; the bottom of the sampling cylinder 12 is provided with the control bolt insertion hole 22; the first end of the control bolt 4 is inserted into the control bolt insertion hole 22, the second end is connected with the first pull rope 3 through the smooth ring 26; the counterweight 9 is connected with the bottom of the sampling cylinder 12 through the third pull rope 8; one end of the second pull rope 7 is connected with the pull rope hole 25, the other end is connected with the smooth ring 26.

[0025] In the embodiment, the sampling cylinder 12 can be made of stainless steel, cast iron, copper, organic glass and other materials which are not easy to rust, and the counterweight can be appropriately increased or reduced according to the actual water depth, so that the sampler can stably hover at the specified depth.

[0026] The bottom of the sampling cylinder 12 is provided with a circular opening 6, and the sealing cover 21 with a rubber plug 20 is arranged outside the opening 6, and the maximum opening angle of the sealing cover 21 is not less than 90 degrees; when the sampling cylinder 12 enters the inside of the water body, the liquid cannot enter the sampling cylinder 12 because the sampling cylinder 12 is closed; when reaching the specified depth, the sealing cover 21 at the bottom of the sampling cylinder 12 is opened, so that the liquid at the specified depth enters the sampling cylinder 12.

[0027] In the embodiment, preferably, the sampling cylinder 12 is made of stainless steel, the top of the sampling cylinder 12 is completely closed, and the lower part of the sampling cylinder 12 is provided with a hole and matched with the sealing cover 21.

[0028] In another embodiment, the sampling cylinder 12 is a cylindrical 304 stainless steel sampling cylinder 12, the diameter of the sampling cylinder 12 is 15 cm, the height is 40 cm, and the wall thickness is 0.5 cm.

[0029] Through the above technical solution, the spring 5 is fixed to the middle part of the outer wall of the sampling cylinder 12, the sealing cover 21 is connected with the smooth ring 26 at the bottom end of the spring 5 through the second pull rope 7, the spring 5 is fixed through the smooth ring 26 and the control bolt 4 before entering the water, the first end of the first pull rope 3 is connected with the control bolt 4, and the second end of the first pull rope 3 is handed over to the operator; after reaching the specified position, the operator pulls the second end of the first pull rope 3 to pull open the control bolt 4, so that the spring 5 pulls open the sealing cover 21 through the second pull rope 7 under the water to open the lower opening 6 of the sampling cylinder 12.

[0030] In the embodiment, the outer side of the sealing cover 21 is connected with a rubber plug 20.

[0031] In the embodiment, the gas delivery assembly comprises a nitrogen cylinder 1 and a first gas flow meter 2; the nitrogen cylinder 1 is connected with the top of the sampling cylinder 12 through a first connecting pipe 27; and the first gas flow meter 2 is installed on the first connecting pipe 27.

[0032] In the embodiment, the gas collection assembly comprises a second gas flow meter 17, a third connecting pipe 28, a fourth connecting pipe 24, a three-way valve 14, a first gas ball valve 15, and a second gas ball valve 16; the first end of the second connecting pipe 13 is connected with the first end of the third connecting pipe 28 through the three-way valve 14, the second end is connected with the sampling cylinder 12 and extends into the sampling cylinder 12, and the second end of the second connecting pipe 13 is connected with the float valve 10; the second end of the third connecting pipe 28 is connected with the gas collection assembly; the first end of the fourth connecting pipe 24 is connected with the second connecting pipe 13 through the three-way valve 14, and the second end is connected with the atmosphere; the first gas ball valve 15 is installed on the fourth connecting pipe 24; the second gas flow meter 17 is installed on the third connecting pipe 28, and the second gas ball valve 16 is installed between the second gas flow meter 17 and the three-way valve 14.

[0033] In the embodiment, the gas collection assembly comprises a canister 19; and the canister 19 is connected with the second end of the third connecting pipe 28.

[0034] In the embodiment, the gas collection assembly further comprises a flow restrictor 18; the flow restrictor 18 is installed on the third connecting pipe 28 and is arranged between the second gas flow meter 17 and the canister 19.

[0035] The flow restrictor 18 is used to control the time of gas entering the canister 19, so that the collected gas has the average value property in a fixed time period; the flow restrictor 18 can be selected as a 1h flow restrictor 18, an 8h flow restrictor 18, or no flow restrictor 18, so that the collected and stored gas in the canister 19 represents the 1h average value, the 8h average value, or the instantaneous value.

[0036] Through the above technical solution, the canister 19 provided with the flow restrictor 18 is used to store the collected gas; the canister 19 is a vacuum stainless steel tank and has a silane inert coating layer, so as to reduce the adsorption of VSCs.

[0037] In the embodiment, the first connecting pipe 27, the second connecting pipe 13, the third connecting pipe 28, and the fourth connecting pipe 24 are all made of PTFE.

[0038] Through the above technical solution, the first connecting pipe 27, the second connecting pipe 13, the third connecting pipe 28, and the fourth connecting pipe 24 made of PTFE are used to connect the components of the real-time collection device, so as to reduce the adsorption of VSCs.

[0039] The fourth pull rope 11 is connected to the top of the sampling cylinder 12 and used to pull the whole sampling cylinder 12 to move.

[0040] According to the technical scheme, the top of the sampling cylinder 12 is connected with a pull ring, one end of the fourth pull rope 11 is connected with the pull ring at the top of the sampling cylinder, and the other end is handed to an operator, which is used to pull the whole sampling cylinder 12 to move.

[0041] The working principle of the real-time collection device for deep water layer VSCs gas provided by the application is as follows: The top of the sampling cylinder 12 is closed and provided with the fourth pull rope 11, which is used to pull the whole sampling cylinder 12 to move, the bottom is provided with an opening 6, and a sealing cover 21 is assembled at the opening 6 to form a sample collection port; a spring 5 is fixed to the outer side of the middle of the sampling cylinder 12 and used to pull the sealing cover 21 underwater, the other end of the spring 5 is connected with a smooth ring 26, a control bolt 4 is inserted into a control bolt insertion hole 22 after passing through the smooth ring 26 to fix the spring 5, the control bolt 4 is controlled by a first pull rope 3, one end of a second pull rope 7 is connected with the sealing cover 21, and the other end is connected with the smooth ring 26, when the sampler reaches a specified water depth, the control bolt 4 is pulled out by the first pull rope 3, and then the spring 5 is tightened to open the sealing cover 21; a first gas ball valve 15 is opened, liquid enters the sampling cylinder 12, when the liquid level reaches a specified height, a float valve 10 is closed, then a nitrogen cylinder 1 is opened to slowly inject a small amount of nitrogen, the sampling cylinder 12 and connecting pipes such as a first connecting pipe 27, a second connecting pipe 13, a third connecting pipe 28 and a fourth connecting pipe 24 are flushed, the first gas ball valve 15 is closed, and the first gas flow meter 2 is observed, when the amount of nitrogen reaches a certain amount (for example, 1-2L), the nitrogen cylinder 1 is closed; during sampling, a second gas ball valve 16 is opened, and gas samples are collected by using a suoma tank 19 to collect gas under negative pressure.

[0042] Embodiment 2

[0043] A collection method for deep water layer VSCs gas, characterized by being the collection method of the real-time collection device for deep water layer VSCs gas in embodiment 1, the collection method comprises the following steps: S1, sinking the gas collection cylinder in a sealed state to a specified depth in a water body; S2, triggering the control bolt 4 mechanism by the first pull rope 3 and the second pull rope 7 to release the spring 5 and pull the sealing cover 21 to open the bottom opening 6 of the sampling cylinder 12; S3, the original gas in the sampling cylinder 12 is discharged, the deep water layer liquid carries bubbles into the sampling cylinder 12, and the liquid surface rises to a predetermined height, and then the float valve 10 is automatically closed; S4, nitrogen is injected into the sampling cylinder 12 through the nitrogen cylinder 1, the remaining space in the sampling cylinder 12 and the connecting pipeline are replaced by blowing, after the replacement is completed, the first gas ball valve 15 is closed, the fourth connecting pipe 24 is disconnected from the atmosphere, a certain amount of nitrogen is continuously injected, and then the switch of the nitrogen cylinder 1 is closed to stop injecting ammonia; Preferably, after the first gas ball valve 15 is closed and the fourth connecting pipe 24 is disconnected from the atmosphere, 1-2L of nitrogen is continuously injected, and then the switch of the nitrogen cylinder 1 is closed to stop injecting ammonia; S5, the second gas ball valve 16 is opened, the flow limiting valve 18 is adjusted to set the collection time, and the deep water layer gas sample in the sampling cylinder 12 after blowing is collected into the suoma tank 19 by using the negative pressure of the suoma tank 19; S6, according to the volume, concentration and collection time of the collected gas, the release rate is calculated according to the formula V=c×Q / t, wherein: V is the release rate of VSCs, mg / min; c is the concentration of VSCs collected in the suoma tank 19, mg / m 3 ; Q is the total volume of gas measured by the second gas flow meter 17, m 3 ; t is the time of the measurement process of the second gas flow meter 17, min; The release flux is calculated by the formula F=c×(Q / t) / S, wherein: F is the release flux of VSCs, mg / (m 2 ·min); c is the concentration of VSCs collected in the suoma tank 19, mg / m 3 ; Q is the total volume of gas measured by the second gas flow meter 17, m 3 ; t is the time of the measurement process of the second gas flow meter 17, min; S is the bottom area of the box, m 2 .

[0044] The above is only a preferred embodiment of the present application, and does not limit the technical scope of the present application in any way, so any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment still belongs to the scope of the technical solution of the present application.

Claims

1. A real-time collection device for VSCs gases in deep water, characterized in that, include: Gas sampling assembly for collecting gases from deep-sea VSCs; A gas delivery assembly is connected to the gas collection assembly via a first connecting pipe to deliver inert gas into the gas collection assembly. A gas collection assembly is connected to the gas acquisition assembly via a second connecting pipe to collect the gas in the gas acquisition assembly; Both the first connecting pipe and the second connecting pipe are equipped with switching valves.

2. The real-time collection device for deep-sea VSCs gases according to claim 1, characterized in that, The gas collection assembly includes a fourth pull rope, a control bolt, a first pull rope, a spring, a sealing cap, a second pull rope, a third pull rope, a counterweight, a float valve, and a sampling tube. The sampling tube has an opening at its bottom, and its top is connected to the gas delivery assembly via a first connecting pipe and to the gas collection assembly via a second connecting pipe. The sealing cap is hinged to the opening, and has a pull rope hole on it, with the pull rope hole and the hinge positioned opposite each other. The spring has a first end connected to the middle of the outer wall of the sampling tube and a smooth ring at the other end. The sampling tube has a control bolt insertion hole at its bottom. The first end of the control bolt is inserted into the control bolt insertion hole, and the second end passes through the smooth ring and connects to the first pull rope. The counterweight is connected to the bottom of the sampling tube via the third pull rope. One end of the second pull rope is connected to the pull rope hole, and the other end is connected to the smooth ring.

3. The real-time collection device for deep-sea VSCs gases according to claim 2, characterized in that, A rubber stopper is attached to the outside of the sealing cap.

4. The real-time collection device for deep-sea VSCs gases according to claim 2, characterized in that, The gas delivery assembly includes a nitrogen cylinder and a first gas flow meter; the nitrogen cylinder is connected to the top of the sampling tube via the first connecting pipe; the first gas flow meter is mounted on the first connecting pipe.

5. The real-time collection device for deep-sea VSCs gases according to claim 4, characterized in that, The gas collection assembly includes a second gas flow meter, a third connecting pipe, a fourth connecting pipe, a three-way valve, a first gas ball valve, and a second gas ball valve. The first end of the second connecting pipe is connected to the first end of the third connecting pipe via the three-way valve, and the second end is connected to the sampling cylinder and extends into the sampling cylinder. A float valve is connected to the second end of the second connecting pipe. The second end of the third connecting pipe is connected to the gas collection assembly. The first end of the fourth connecting pipe is connected to the second connecting pipe via the three-way valve, and the second end is open to the atmosphere. The first gas ball valve is installed on the fourth connecting pipe. The second gas flow meter is installed on the third connecting pipe, and the second gas ball valve is installed between the second gas flow meter and the three-way valve.

6. The real-time collection device for deep-sea VSCs gases according to claim 5, characterized in that, The gas collection assembly includes a suma canister; the suma canister is connected to the second end of the third connecting pipe.

7. The real-time collection device for deep-water VSCs gases according to claim 6, characterized in that, The gas collection assembly also includes a flow limiting valve, which is installed on the third connecting pipe and positioned between the second gas flow meter and the Summa tank.

8. The real-time collection device for deep-sea VSCs gases according to claim 5, characterized in that, The first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are all made of PTFE.

9. The real-time collection device for deep-sea VSCs gases according to claim 2, characterized in that, The top of the sampling tube is connected to a fourth rope, which is used to pull the entire sampling tube to move.

10. A method for collecting VSCs gases in deep water, characterized in that, A collection method for a real-time collection device for deep-sea VSCs gases according to any one of claims 1 to 9, the collection method comprising the following steps: S1. Submerge the sealed gas collection tube to a specified depth in the water body; S2. The control bolt mechanism is remotely triggered by the first and second pull ropes to release the spring and pull the sealing cover to open the bottom opening of the sampling cylinder. S3. The original gas in the sampling tube is discharged, and the deep water liquid carries the air bubbles into the sampling tube. After the liquid level rises to the predetermined height, the float valve automatically closes. S4. Inject nitrogen into the sampling tube through the nitrogen cylinder to purge and replace the remaining space in the sampling tube and the connecting pipeline. After the replacement is completed, close the first gas ball valve, disconnect the fourth connecting pipe from the atmosphere, continue to inject a certain amount of nitrogen, and then close the switch of the nitrogen cylinder to stop injecting ammonia. S5. Open the second gas ball valve and adjust the flow limiting valve to set the collection time. Use the negative pressure of the SUMAT canister to collect the deep-water gas sample that has been purged in the sampling tube into the SUMAT canister. S6. Based on the volume and concentration of the collected gas and the collection time, calculate the release rate using the formula V=c×Q / t, where: V—VSCs release rate, mg / min; c—Concentration of VSCs collected in the Suma container, mg / m³ 3 ; Q—Total gas volume measured by the second gas flow meter, in m³ 3 ; t—The time (in minutes) for the second gas flow meter to measure the flow rate; The released flux is calculated using the formula F=c×(Q / t) / S, where: F-VSCs release flux, mg / (m³) 2 ·min); c—Concentration of VSCs collected in the Suma container, mg / m³ 3 ; Q—Total gas volume measured by the second gas flow meter, in m³ 3 ; t—The time (in minutes) for the second gas flow meter to measure the flow rate; S—Base area of ​​the box, m 2 .

Images