CN212364225U - Equipment sound sealing point VOCs sampling device - Google Patents
Equipment sound sealing point VOCs sampling device Download PDFInfo
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- CN212364225U CN212364225U CN202020664521.8U CN202020664521U CN212364225U CN 212364225 U CN212364225 U CN 212364225U CN 202020664521 U CN202020664521 U CN 202020664521U CN 212364225 U CN212364225 U CN 212364225U
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Abstract
The utility model provides an equipment sound sealing point VOCs sampling device and leakage quantity measuring method. The sampling device comprises an enclosure system, a sampling system and a vacuum-pumping system; the enclosure system comprises an enclosure bag for sealing and wrapping dynamic and static sealing points of the equipment; the sampling system comprises a closed container, a cold bath, a flowmeter, a sampling pump and a sampling bag, wherein an air inlet of the closed container is communicated with the enclosing bag, an air outlet of the closed container is communicated with an inlet of the cold bath, an outlet of the cold bath is communicated with an inlet of the flowmeter, an outlet of the flowmeter is connected with the sampling bag through the sampling pump, a sampling pipeline valve is arranged between the sampling pump and the sampling bag, and the sampling bag is detachably connected with a first pressure gauge; the vacuum pumping system comprises a vacuum pump communicated with an inlet of the flowmeter. The utility model discloses a sampling device is to equipment sound sealed point department VOCs leakage measurement design, and its structural design is comparatively reasonable, and the strong operability, the accurate sampling and survey equipment sound sealed point department unorganized emission VOCs's concentration.
Description
Technical Field
The utility model relates to an atmosphere volatile organic compounds detects technical field, concretely relates to equipment sound sealing point VOCs sampling device.
Background
Some alkane, arene and olefin Volatile Organic Compounds (VOCs) are essential production raw materials in the production of petrochemical industry, coal chemical industry, synthetic materials, medicines and other industries, and because the Volatile Organic Compounds (VOCs) have certain pollution and even certain toxicity to the environment, closed conveying pipelines are mostly used for conveying the Volatile Organic Compounds (VOCs) when the Volatile Organic Compounds (VOCs) are conveyed. And when the relevant conveying pipelines are connected and connected with relevant production equipment, storage tanks and loading facilities, a large number of dynamic and static sealing points of the equipment are involved. Along with the reasons of prolonged service time, equipment aging and the like, certain leakage phenomenon inevitably exists at the sealing parts such as pipe valves and the like, so that VOCs are easy to leak out from the gap between the shaft seal and the fittings of the dynamic and static sealing points of the equipment.
The dynamic and static sealing points of the equipment are equipment or pipelines involved in VOCs flowing or contacting, and comprise more than 10 types such as a pump, a compressor, a stirrer, a valve, pressure relief equipment, a sampling connection system, an opening valve or an opening pipeline, a flange, a connecting piece and the like. Due to the fact that the types of the devices are various, a uniform and consistent method for measuring VOCs leakage at the dynamic and static sealing points of the devices does not exist at present. In actual evaluation, the method for detecting and accounting the unorganized volatile organic compounds discharged from the dynamic and static sealing points of the existing equipment is mainly characterized in that according to a correlation equation method in a VOCs pollution source investigation working instruction in petrochemical industry, a leakage detection value detected by a portable toxic volatile gas analyzer and the mass fraction of VOCs in TOC (total organic carbon) are substituted into the correlation equation, and the VOCs discharge rate of the dynamic and static sealing points of the equipment is obtained. However, practical application shows that the difference between the leakage value calculated by the method and the leakage value of the dynamic and static sealing points of the real equipment is large, and the real VOCs leakage value of the dynamic and static sealing points of the equipment cannot be reflected really.
SUMMERY OF THE UTILITY MODEL
To the technical problem, an object of the utility model is to provide an equipment sound sealing point VOCs's sampling device, this sampling device can carry out accurate sampling to the VOCs that equipment sound sealing point unorganized discharged to can make accurate evaluation to equipment sound sealing point VOCs's the actual situation of revealing.
In order to achieve the above object, the utility model discloses a technical scheme that equipment sound sealing point VOCs sampling device adopted is: the equipment dynamic and static sealing point VOCs sampling device comprises: comprises an enclosure system, a sampling system and a vacuum-pumping system;
the enclosure system comprises an enclosure bag for sealing and wrapping dynamic and static sealing points of equipment by means of a sealing piece;
the sampling system comprises a closed container, a cold bath, a flowmeter, a sampling pump and a sampling bag, wherein an air inlet of the closed container is communicated with an enclosure bag, an air outlet of the closed container is communicated with an inlet of the cold bath through a first gas pipeline, an outlet of the cold bath is communicated with an inlet of the flowmeter through a second gas pipeline, an outlet of the flowmeter is detachably and hermetically connected with the sampling bag through a sampling pipeline, the sampling pipeline is provided with the sampling pump, a sampling pipeline valve for controlling the on-off of the sampling pipeline is arranged on the sampling pipeline between the sampling pump and the sampling bag, and the sampling bag is detachably connected with a first pressure gauge;
the vacuum pumping system comprises a vacuum pump, and an air inlet of the vacuum pump is communicated with an inlet of the flowmeter through an air suction pipeline.
Preferably, an air suction pipeline valve for controlling the on-off of the air suction pipeline is arranged on the air suction pipeline.
Preferably, a filter is arranged on the suction pipeline between the vacuum pump and the suction pipeline valve.
Preferably, the closed container is a sealing bag, an air inlet pipeline used for ventilating the sealing bag to prevent the sealing bag from being attached to the inner wall of the bag body under the action of a vacuum pump is connected to the sealing bag, and a second pressure gauge used for displaying the pressure in the sealing bag is arranged on the air inlet pipeline.
Preferably, a support for preventing the inner wall of the sealing bag from being attached is arranged in the sealing bag.
Preferably, the closed container, the sealing bag, the sampling bag, the first gas pipeline, the second gas pipeline, the sampling pipeline, the air extraction pipeline valve, the sampling pipeline valve and the gas inlet pipeline are all made of PTFE materials.
The utility model has the advantages that:
(1) the utility model discloses a device sound seal point VOCs sampling device can carry out accurate sampling to the VOCs that device sound seal point unorganized discharged to can make accurate evaluation to the actual condition of revealing of device sound seal point VOCs, and then lay a good foundation for safety in production;
(2) the utility model discloses a device sound sealing point VOCs sampling device can directly carry out sample collection at device sound sealing point position, need not to open the equipment subassembly, therefore suitable for subassembly, application scene and application scope comparatively extensive (not only can be used to petrochemical industry, also be applicable to the sampling of coal industry, synthetic material, chemical pharmacy, pesticide, organic fine chemistry industry etc. chemical industry equipment sound sealing point unorganized emission VOCs simultaneously);
(3) the utility model discloses an equipment sound sealing point VOCs sampling device owing to be directly to sampling to equipment sound sealing point position, consequently, can be comparatively true and accurate reflection equipment sound sealing point position VOCs leakage condition, so the testing result is more accurate.
Generally, the utility model discloses an equipment sound sealing point VOCs sampling device is to equipment sound sealing point department VOCs leakage measurement design, its structural design is comparatively reasonable, the strong operability, accurate sampling and survey equipment sound sealing point department inorganization discharge VOCs's concentration, the problem of prior art to the unable real concrete ration accounting of equipment sound sealing point inorganization discharge VOCs has been overcome better, to evaluation and survey VOCs's the actual leakage condition, and the security of relevant equipment, the leakproofness has better practical value.
Drawings
Fig. 1 is a schematic diagram of a specific embodiment of the dynamic and static sealing point VOCs sampling device of the equipment.
In the figure: 1. a seal member; 2. enclosing a bag; 3. a closed container; 4. a cold bath; 5. a flow meter; 6. a sampling pump; 7. a sampling bag; 8. a first gas transmission pipeline; 9. a second gas transmission pipeline; 10. a sampling pipeline; 11. sampling a pipeline valve; 12. a vacuum pump; 13. an air extraction pipeline; 14. a suction line valve; 15. a filter; 16. an air intake line; 17. a second pressure gauge; 18. dynamic and static sealing points of the equipment; 19. and a support.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
The utility model relates to a concrete embodiment of equipment sound sealing point VOCs sampling device, as shown in FIG. 1, equipment sound sealing point VOCs sampling device is including enclosing system, sampling system and evacuation system.
The enclosure system comprises an enclosure bag 2 for sealing the dynamic and static sealing points 18 of the packaging device by means of a seal 1, which may be an adhesive tape, a tie or the like.
The sampling system comprises a closed container 3, a cold bath tank 4, a flowmeter 5, a sampling pump 6 and a sampling bag 7. The air inlet 3 of the closed container is communicated with the enclosing bag 2 so as to suck VOCs leaked at the dynamic and static sealing points into the closed container. The gas outlet of closed container 3 is through the import intercommunication of first gas transmission pipeline 8 with cold bath 5, and the export of cold bath 5 is through the import intercommunication of second gas transmission pipeline 9 with flowmeter 5, and cold bath 4's effect is to lower the temperature, makes the steam liquefaction in the VOCs become liquid and stays in ice bath 4, and the VOCs that does not contain steam gets into the flowmeter to the accuracy of sampling has been ensured. The outlet of the flowmeter 5 is detachably and hermetically connected with the sampling bag 7 through the sampling pipeline 10, the sampling pipeline 10 is provided with the sampling pump 6, the sampling pipeline 10 between the sampling pump 6 and the sampling bag 7 is provided with the sampling pipeline valve 11 for controlling the on-off of the sampling pipeline 10, the sampling bag 7 is detachably connected with a first pressure gauge (not shown in the figure), and the pressure in the sampling bag 7 can be detected and observed in real time through the first pressure gauge.
The vacuumizing system comprises a vacuum pump 12, an air inlet of the vacuum pump 12 is communicated with an inlet of the flowmeter 5 through an air suction pipeline 13, an air suction pipeline valve 14 for controlling the on-off of the air suction pipeline 13 is arranged on the air suction pipeline 13, a filter 15 is arranged on the air suction pipeline 13 between the vacuum pump 12 and the air suction pipeline valve 14, the filter 15 purifies VOCs, and the gas pumped out from the vacuum pump 12 is prevented from causing serious pollution to the atmosphere.
In this embodiment, airtight container 3 adopts the sealing bag, because the deformation of sealing bag is big, and its use does not receive the restriction of environment, thereby has increased the utility model discloses an application range. Connect air inlet pipeline 16 on the sealed bag, at the in-process of evacuation, let in the air in to the sealed bag through air inlet pipeline 16, make produce slight vacuum in the sealed bag, avoid the sealed bag obvious vacuum to appear and take place the inseparable laminating of internal wall of bag, influence the gas circulation, and then influence the accuracy of sampling. To facilitate the knowledge of whether a slight vacuum has been created in the bag, a second pressure gauge 17 is provided in the inlet line 16 for indicating the pressure in the bag.
In order to further ensure that the sealed bag is subjected to a significant vacuum and the inner wall of the bag body is tightly attached, in this embodiment, the sealed bag is provided with a support 19.
In this embodiment, closed container 3, sampling bag 7, first gas transmission pipeline 8, second gas transmission pipeline 9, sample sampling pipeline 10, air extraction pipeline 13, air extraction pipeline valve 14, sampling pipeline valve 11, air inlet pipeline 16 all adopt the PTFE material to make, and the PTFE material has the characteristics of low adsorptivity, high chemical inertia, avoids in the sampling process VOCs by the absorption with take place chemical reaction to the accuracy of sampling has been ensured.
In this embodiment, flowmeter 5 adopts rotameter, and rotameter has simple structure small and exquisite, shows the branch pipe, and loss of pressure is little, easy maintenance, low price's advantage. The flow meter is dehumidified by a desiccant prior to use.
In this embodiment, the sampling pump 6 is a diaphragm pump, which can transport a medium completely without leakage and is not corroded by the medium, thereby further ensuring the readiness for sampling.
In this embodiment, the vacuum pump 12 is a teflon annular piston type vacuum pump, which has strong corrosion resistance, such as: can resist chemical corrosion of HCI, HNO3, HF, bromine water, chloroform, dichloromethane, benzene, toluene, etc.
The method for measuring the VOCs leakage rate of the dynamic and static sealing points of the equipment by using the sampling equipment specifically comprises the following steps:
(1) selecting a proper enclosing bag 2 according to the type and size of the dynamic and static sealing points of the equipment to be detected, and sealing and wrapping the dynamic and static sealing points 18 of the equipment by means of a sealing element 1;
(2) starting a vacuum pump, starting vacuumizing, recording the time required by the pressure in the sealing bag to reach the water pressure of 2.54cm, then starting timing, recording the reading of a flowmeter, the reading of the pressure and the running time at fixed intervals, and measuring and recording the TVOC concentration at the outlet of the vacuum pump;
(3) after 12 export TVOC concentrations of vacuum pump reached dynamic balance, open the sampling pump and sample, the vacuum pump export TVOC concentration reaches dynamic balance and does: the change of the detection value per second within 1min is within 10 percent;
(4) after sampling is finished, sampling ambient air near the dynamic and static sealing points of the equipment and taking the ambient air as a background sample;
(5) calculating the VOCs leakage rate of the dynamic and static sealing points of the equipment, wherein the calculation formula is as follows: dV=（Da- Db）/T；
In the formula: dVLeak value of unorganized discharge of seal points; daAverage value of TVOC concentration in the sample bag; dbSetting the TVOC concentration of the background sample of the dynamic and static sealing points of the equipment; t, sampling time.
In the specific determination process, in order to improve the real accuracy of data acquisition, under the condition that the sampling device is stable, 3-5 samples must be acquired for the bag and the environmental background sample of each equipment dynamic and static sealing point position, and the average value of the acquired samples is taken as the analysis result.
In other embodiments, the closed container may also adopt a rigid box (not being flattened in a vacuum state), in which case, the leakage rate of VOCs at the dynamic and static sealing points of the equipment is calculated by the following formula: dV= Da/T；
In the formula: dVLeak value of unorganized discharge of seal points; daAverage value of TVOC in the sample bag; t, sampling time.
In other embodiments, the sampling pump can also adopt a common air pump; the vacuum pump can also adopt a common vacuum pump; the flow meter can also adopt a differential pressure type flow meter, a positive displacement flow meter and the like.
In other embodiments, the pressure setting for the sealed bag to create the micro-vacuum is not limited as long as the sealed bag is capable of creating the micro-vacuum.
The utility model discloses an equipment sound sealing point VOCs lets out leakage volume survey case
Measurement target: a DN100 flange of a methanol refining device area of a refining plant area in Henan.
The determination steps are as follows:
(1) firstly, selecting an enclosing bag which can completely wrap the dynamic and static sealing point positions of the equipment to be detected and has a proper shape and size according to the type and size of the dynamic and static sealing points of the coated (wrapped) equipment to be detected, and then utilizing a binding belt to tightly enclose the dynamic and static sealing points of the equipment by the enclosing bag;
(2) starting a vacuum pump, starting vacuumizing, wherein only slight vacuum is kept in the sealing bag 3 (the pressure in the sealing bag is kept at the water pressure of 2.54 cm) in the vacuumizing process, the time for the sealing bag to reach the water pressure of 2.54cm is recorded for 5.7min, then a stopwatch is started, the pressure, dry gas reading and running time are recorded every 2min, and the concentration of TVOC (total volatile organic compound) at the outlet of the vacuum pump is detected and recorded by using a portable toxic gas analyzer, and the result is 1988 ppm;
(3) when the concentration of the outlet v of the vacuum pump of the enclosed system reaches dynamic balance (the change of the detection value per second within 1min is within 10%), starting a sampling pump, and sampling by using a sampling bag;
(4) after sampling is finished, sampling ambient air near the dynamic and static sealing points of the sealed equipment to be used as a background sample, wherein the TVOC concentration of the background sample is 5 ppm;
(5) according to formula DV=（Da- Db) And calculating the leakage rate of the VOCs by using the/T, wherein the leakage rate of the VOCs is 0.0000422018 kg/h.
Claims (6)
1. The utility model provides an equipment sound sealing point VOCs sampling device which characterized in that: comprises an enclosure system, a sampling system and a vacuum-pumping system;
the enclosure system comprises an enclosure bag for sealing and wrapping dynamic and static sealing points of equipment by means of a sealing piece;
the sampling system comprises a closed container, a cold bath, a flowmeter, a sampling pump and a sampling bag, wherein an air inlet of the closed container is communicated with an enclosure bag, an air outlet of the closed container is communicated with an inlet of the cold bath through a first gas pipeline, an outlet of the cold bath is communicated with an inlet of the flowmeter through a second gas pipeline, an outlet of the flowmeter is detachably and hermetically connected with the sampling bag through a sampling pipeline, the sampling pipeline is provided with the sampling pump, a sampling pipeline valve for controlling the on-off of the sampling pipeline is arranged on the sampling pipeline between the sampling pump and the sampling bag, and the sampling bag is detachably connected with a first pressure gauge;
the vacuum pumping system comprises a vacuum pump, and an air inlet of the vacuum pump is communicated with an inlet of the flowmeter through an air suction pipeline.
2. The dynamic and static sealing point VOCs sampling device of claim 1, characterized in that: and an air exhaust pipeline valve for controlling the on-off of the air exhaust pipeline is arranged on the air exhaust pipeline.
3. The dynamic and static sealing point VOCs sampling device of claim 2, characterized in that: and a filter is arranged on the air exhaust pipeline between the vacuum pump and the air exhaust pipeline valve.
4. The dynamic and static sealing point VOCs sampling device of claim 3, characterized in that: the sealed container is a sealed bag, an air inlet pipeline used for ventilating the sealed bag to prevent the sealed bag from being attached to the inner wall of the bag body under the action of the vacuum pump is connected to the sealed bag, and a second pressure gauge used for displaying the pressure in the sealed bag is arranged on the air inlet pipeline.
5. The dynamic and static sealing point VOCs sampling device of claim 4, wherein: and a support for preventing the inner wall of the sealing bag from being attached is arranged in the sealing bag.
6. The dynamic and static sealing point VOCs sampling device of claim 5, characterized in that: the closed container, the sampling bag, the first gas transmission pipeline, the second gas transmission pipeline, the sampling pipeline, the air pumping pipeline valve, the sampling pipeline valve and the gas inlet pipeline are all made of PTFE materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020664521.8U CN212364225U (en) | 2020-04-27 | 2020-04-27 | Equipment sound sealing point VOCs sampling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020664521.8U CN212364225U (en) | 2020-04-27 | 2020-04-27 | Equipment sound sealing point VOCs sampling device |
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| CN212364225U true CN212364225U (en) | 2021-01-15 |
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| CN202020664521.8U Active CN212364225U (en) | 2020-04-27 | 2020-04-27 | Equipment sound sealing point VOCs sampling device |
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