CN206440675U - The pretreating device that volatile organic matter is monitored on-line in water - Google Patents

The pretreating device that volatile organic matter is monitored on-line in water Download PDF

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Publication number
CN206440675U
CN206440675U CN201621494324.6U CN201621494324U CN206440675U CN 206440675 U CN206440675 U CN 206440675U CN 201621494324 U CN201621494324 U CN 201621494324U CN 206440675 U CN206440675 U CN 206440675U
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gas
water
watering apparatus
purging
pretreating device
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CN201621494324.6U
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褚衍龙
项光宏
姚品江
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Focused Photonics Hangzhou Inc
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Focused Photonics Hangzhou Inc
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Abstract

The utility model is related to the pretreating device that volatile organic matter is monitored on-line in a kind of water, including purging container, and sample introduction pipeline, scavenging pipeline and the gas collection pipe being connected with the purging container, the pretreating device further comprise:Preheating device, water sample to be measured enters purging container after being heated to preset temperature through the preheating device;De-watering apparatus, the de-watering apparatus is arranged on gas collection pipe, and the air inlet of de-watering apparatus is less than gas outlet, is provided with water storage container below the connecting portion of the air inlet and gas outlet, the water storage container connects the air inlet and gas outlet;Lid, the lid is covered seals it on purging container, and the scavenging pipeline and gas collection pipe pass through the lid, are connected respectively with first gas and chromatograph.The utility model has the advantages that simple in construction, purging efficiency high, maintenance cost be low, testing result is accurate.

Description

The pretreating device that volatile organic matter is monitored on-line in water
Technical field
The utility model is related to the preceding place that volatile organic matter is monitored on-line in water quality monitoring field, more particularly to a kind of water Manage device.
Background technology
Puffing and trapping is a kind of Dynamic headspace technology, and this method does not cause secondary without using organic solvent to environment Pollution, sampling amount is few, bioaccumulation efficiency is high, simple to operate, with gas-chromatography be combined can be achieved water in volatile organic matter it is online Monitoring.But purge and trap has the following disadvantages with gas chromatography combined be used in monitoring water quality on line:
1st, influence of the different temperatures to organic matter stripping efficiency;
The balance pressure ratio of the solubility and ullage solute of organic matter in the solution is affected by temperature, and water temperature is not Together, organic matter stripping efficiency is also different;
2nd, organic matter is readily adsorbed in pipeline, under the influence of one-shot measurement;
3rd, the water vapour contained in the mixed gas that stripping goes out can be such that the stationary phase of chromatographic column expands rapidly, change chromatographic column The polarity of stationary phase, causes chromatographic peak to drift about, system None- identified object.
In order to reduce the influence of environment temperature, at present generally using the method for extension purge time, but increase purge time Afterwards the water content of stripping gas can be caused to greatly improve, add the pressure of water removal.By NAFION drying tubes to stripping gas It is dried, removes moisture, but it is also problematic:1st, halogenated hydrocarbons can manage permeable, influence halogenated hydrocarbons inspection by NAFION Rising limit;2nd, NAFION pipes need to be passed through a large amount of dry zero gas during water removal, in order to ensure water removal effect, need often more renew NAFION pipes, not only make system complex, and increase maintenance cost, limitation Puffing and trapping-gas chromatography combined usage is in water Application on matter in-line analyzer.
Utility model content
In order to solve the deficiency in above-mentioned prior art, the utility model provides a kind of simple in construction, purging effect Rate is high, water removal effect is good, maintenance cost is low, can eliminate volatile organic matter in the water that organic gas is remained in pipeline and supervise online The pretreating device of survey.
The purpose of this utility model is achieved through the following technical solutions:
The pretreating device that volatile organic matter is monitored on-line in a kind of water, including purging container, with the purging container Connected sample introduction pipeline, scavenging pipeline and gas collection pipe, the pretreating device further comprises:
Preheating device, water sample to be measured enters purging container after being heated to preset temperature through the preheating device;
De-watering apparatus, the de-watering apparatus is arranged on gas collection pipe, and the air inlet of de-watering apparatus is less than gas outlet, described Water storage container is provided with below air inlet and the connecting portion of gas outlet, the water storage container connects the air inlet and gas outlet;
Lid, the lid is covered seals it on purging container, and the scavenging pipeline and gas collection pipe are described in Lid, is connected with first gas and chromatograph respectively.
According to above-mentioned pretreating device, it is preferable that be provided with refrigeration device below the de-watering apparatus, for reducing water removal The temperature of device, improves water rem oval and water removal effect.
According to above-mentioned pretreating device, it is preferable that the sample introduction pipeline is provided with second gas entrance, second gas Body entrance is arranged between sample water inlet and the preheating device.
According to above-mentioned pretreating device, it is preferable that the gas collection pipe is provided with third gas entrance, the 3rd gas Body entrance is arranged between chromatograph and the de-watering apparatus.
According to above-mentioned pretreating device, it is preferable that the de-watering apparatus is provided with primary heater, anti-in third gas The water in the primary heater, water storage container is opened before drift air pipe to be heated vaporization and blow out from purging container.
According to above-mentioned pretreating device, it is preferable that the lid is provided with secondary heater, for heating lid.
According to above-mentioned pretreating device, it is preferable that the outer wall parcel insulation material of the purging container.
According to above-mentioned pretreating device, alternatively, the first gas is inert gas.
According to above-mentioned pretreating device, alternatively, the third gas is inert gas.
According to above-mentioned pretreating device, it is preferable that the first gas and third gas is are provided by same source of the gas.
Compared with prior art, the utility model have the advantage that for:
1st, the preheated device of water sample to be measured of the present utility model, which is heated and reached, enters purging container after preset temperature, simultaneously Purging container outer wall is enclosed with insulation material so that water sample to be measured keeping temperature in purge is constant, purges efficiency high, blows Scavenging consumption is small, purges stabilised efficiency.
2nd, water sample to be measured of the present utility model is heated by the metallic coil set outside preheating device, be heated evenly, Heating is fast;And water sample to be measured is purged immediately after purging container is entered so that most of volatile organic matter in water sample is rapid The stripping from water sample, so trapped by enrichment pipe, chromatogram column analysis, improve the concentration effect of organic matter, it is ensured that testing result Accuracy and stability.
3rd, sample introduction pipeline of the present utility model is provided with second gas entrance, and water sample to be measured and second gas automatically switch, The VOC that residual water sample and sample introduction pipeline inner wall are adsorbed in sample introduction pipeline is purged by second gas, it is to avoid water sample Measurement next time is impacted with the residual of organic matter.
4th, the air inlet of the utility model de-watering apparatus is less than the connecting portion lower section of gas outlet, the air inlet and gas outlet Provided with water storage container, the volatile organic matter for carrying steam collides with the water storage container wall, and steam is in water removal cell-wall On condense into drop, stored through Action of Gravity Field into water storage container, VOC passes through the gas outlet and then rich Collector is trapped, it is to avoid the loss of volatile organic matter.
5th, de-watering apparatus of the present utility model is provided with heater, and the condensed water in water storage container is held by thermal evaporation from purging Device is drained;While using nitrogen blowback, it is organic that high temperature blowback air purging takes away gas collection pipe, the interior volatility adsorbed of purging container Gas, it is to avoid influence is produced on measurement next time, the stability and accuracy of testing result is improved.
Brief description of the drawings
Referring to the drawings, disclosure of the present utility model will be easier to understand.Skilled addressee readily understands that It is:These accompanying drawings are used only for illustrating the technical solution of the utility model, and are not intended to protection of the present utility model Scope is construed as limiting.In figure:
Fig. 1 be the utility model embodiment 1 water in volatile organic matter monitor on-line pretreating device structural representation Figure.
Embodiment
Fig. 1 and following description describe optional embodiment of the present utility model to instruct those skilled in the art how real Apply and reproduce the utility model.In order to instruct technical solutions of the utility model, simplify or eliminate some conventional aspects.Ability Field technique personnel should be appreciated that modification or replacement from these embodiments will be in the range of the utility model.This area skill Art personnel should be appreciated that following characteristics can combine to form multiple modifications of the present utility model in a variety of ways.Thus, this reality Following embodiments are not limited to new, and are only limited by claim and their equivalent.
Embodiment 1
The structure that Fig. 1 schematically illustrates volatile organic matter on-line monitoring pretreating device in the water of the present embodiment is shown It is intended to, as shown in figure 1, the pretreating device of volatile organic matter on-line monitoring includes:
Purge and set on container, the purging container connection sample introduction pipeline, scavenging pipeline and gas collection pipe, the purging container There are overfall and leakage fluid dram;
Preheating device, water sample to be measured enters purging container after being heated to preset temperature through the preheating device;
De-watering apparatus, the de-watering apparatus is arranged on gas collection pipe, and the air inlet of de-watering apparatus is less than gas outlet, described Water storage container is provided with below air inlet and the connecting portion of gas outlet, the water storage container connects the air inlet and gas outlet;
Lid, the lid is covered seals it on purging container, and the scavenging pipeline and gas collection pipe are described in Lid, is connected with first gas and chromatograph respectively.
The mixed gas temperature that purging container stripping goes out is higher, high humidity, and water vapour can make the stationary phase of chromatographic column fast Speed expansion, influences testing result, therefore, and VOC enters chromatograph detection after need to being removed water through de-watering apparatus.In order to The water removal effect and water rem oval of de-watering apparatus are improved, therefore:
Further, refrigeration device is provided with below the de-watering apparatus, the temperature of de-watering apparatus is reduced to a greater degree, is made Water vapour fast liquefying.
After the completion of time water sample detection to be measured, water sample can be remained in sample introduction pipeline, sample introduction pipeline inner wall can adsorb volatilization Property organic gas, in order to prevent on next water sample measurement produce influence, therefore:
Further, the sample introduction pipeline is provided with second gas entrance, and the second gas entrance is arranged on water sample and entered Between mouth and the preheating device;After secondary water sample to be measured is measured, water sample to be measured is switched into second gas, second gas Sample introduction pipeline is purged, the moisture of residual and the volatile organic matter of absorption are drained through purging container.
After the completion of time water sample detection to be measured is worked as, the volatility of moisture and the absorption of gas collection pipe inwall in water storage container Organic matter can influence the accuracy of next measurement result, therefore:
Further, the gas collection pipe is provided with third gas entrance, and the third gas entrance is arranged on chromatograph Between the de-watering apparatus.
Further, the de-watering apparatus is provided with primary heater, and institute is opened before third gas blowback gas collection pipe The water stated in primary heater, water storage container is heated vaporization, improves purging efficiency.
During the stripping of VOC, the stripping gaseous mixture of part water sample to be measured, which is easily formed, relatively stablizes gas Bubble rises from liquid level so that the rise of moisture content in gas collection pipe, bubble it could even be possible to block gas collection pipe, therefore:
Further, the lid is provided with secondary heater, for heating lid, makes in purging container close to lid area Domain temperature rise, the bubble heat of rising expands and ruptured.
In order that obtaining, water sample to be measured keeping temperature in purge is constant, and raising purging efficiency reduces purge gass consumption, Therefore:
Further, the purging container outer wall is enclosed with insulation material.
The present embodiment also provides the pre-treating method that volatile organic matter in above-mentioned water monitors pretreating device on-line, described Pre-treating method includes:
(A1) preheated device heats and reaches that the water sample to be measured of preset temperature enters purging container, and constant volume stops sample introduction;
(A2) first gas purges water sample to be measured through scavenging pipeline, and volatile organic matter enters color after being removed water through de-watering apparatus Spectrometer;
(A3) first gas stops water sample in purging, emptying purging container, second gas purging sample introduction pipeline;
(A4) second gas stops purging, and primary heater is opened, third gas reverse blow gas collection pipe, water storage container Interior moisture is blown away from the purging container.
Further, when purging water sample to be measured, secondary heater is opened, close to lid regional temperature liter in purging container Height, the bubble heat swelling fracture of rising.
In order to ensure the accuracy of testing result, therefore:
Further, the pre-treating method also includes:
(B1) water sample to be measured carries out rinse to sample intake passage and purging container;
(B1) step is located at before (A1) step.
Before water sample to be measured purging, air is full of above purging vessel level and in gas collection pipe, if directly will purging The stripping gas trapping at initial stage enters chromatograph, will largely effect on the accuracy of testing result, therefore:
Further, initial stage is purged, is opened above the exhaust-valve on gas collection pipe branch road, discharge purging vessel level and collection After air in air pipe, volatile organic matter enters chromatograph.
Embodiment 2
Volatile organic matter on-line monitoring pretreating device the answering in water quality monitoring field of the utility model embodiment 1 With.
In the application examples, purging container is scavenging tank, and the purging pot sidewall is provided with overflow ducts, and the overflow is led to It is provided with road below flow monitor, scavenging tank and is provided with leakage fluid dram, provided with metal cap body sealing, the metal cover above scavenging tank Heater, temperature sensor are provided with vivo;Sample introduction pipeline is provided with water sample sampling valve, peristaltic pump, preheating device, the pre- hot charging Heater and temperature sensor are provided with putting, preheating device is around with metal tube, and water sample reaches preset temperature after metal tube, The preset temperature is higher than room temperature (such as 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C), the sample feeding pipe between water sample sampling valve and peristaltic pump Road is provided with second gas (such as air) entrance, passes through Valve controlling break-make;Scavenging pipeline is provided with flow controller, for setting Determine purge gass (inert gas, such as nitrogen) flow, the scavenging pipeline is stretched under water sample liquid level to be measured;Gas collection pipe is provided with De-watering apparatus, gas collection pipe entrance is located on water sample liquid level to be measured, and the de-watering apparatus is provided with refrigeration device (such as fan) And heating rod, gas collection pipe between de-watering apparatus and chromatograph provided with gas empty branch road and third gas (inert gas, Such as nitrogen) blowback branch road, pass through the break-make of Valve controlling branch road.
The workflow of the pretreating device of the volatile organic matter on-line monitoring of the present embodiment is as follows:
S1. rinse:Sample introduction, water sample sample introduction speed is 80ml/min, is entered in scavenging tank, overflow ducts after preheated device Flow monitor detect liquid, stop sample introduction, the water sample in scavenging tank emptied by leakage fluid dram;
S2. constant volume:Sample introduction, water sample is heated to 40 DEG C after preheating device, into scavenging tank constant volume;
S3. purge:Nitrogen purge rates are set as 40mL/L by flow controller, the wind below de-watering apparatus is opened Fan, opens above the gas emptying branch road on gas collection pipe, tank water sample to be purged with after air emptying in gas collection pipe, closes institute Gas emptying branch road is stated, chromatograph trapping, analysis is opened;
S4. air purges sample introduction pipeline:Water sample in scavenging tank is emptied, the air intake on sample introduction pipeline is opened, air blows The residual water sample and the VOC of sample introduction pipeline inner wall absorption swept into sample pipeline, and discharged by scavenging tank;
S5. nitrogen blowback gas collection pipe:The heating rod on de-watering apparatus is opened, nitrogen is through the blowback branch road on gas collection pipe The water in blowback, cistern is carried out into gas collection pipe to it to be vaporized, while nitrogen is also heated, hot nitrogen is by the water of vaporization Steam, the VOC of gas collection pipe inwall absorption are taken away, and are discharged by scavenging tank;
S6. the heating rod on de-watering apparatus stops heating, opens fan, treats that de-watering apparatus temperature is down to room temperature, closes wind Fan, stops blowback.
Embodiment 3
The present embodiment provides the pretreating device that volatile organic matter is monitored on-line in a kind of water, different from embodiment 1 It is that the first gas and third gas can use chromatographic carrier gas to be provided by same source of the gas.

Claims (7)

1. the pretreating device that volatile organic matter is monitored on-line in a kind of water, including purging container, with the purging container phase Sample introduction pipeline, scavenging pipeline and gas collection pipe even, it is characterised in that:The pretreating device further comprises:
Preheating device, water sample to be measured enters purging container after being heated to preset temperature through the preheating device;
De-watering apparatus, the de-watering apparatus is arranged on gas collection pipe, and the air inlet of de-watering apparatus is less than gas outlet, the air inlet Mouth connects the air inlet and gas outlet with being provided with water storage container, the water storage container below the connecting portion of gas outlet;
Lid, the lid is covered seals it on purging container, and the scavenging pipeline and gas collection pipe pass through the lid, It is connected respectively with first gas and chromatograph.
2. pretreating device according to claim 1, it is characterised in that:Refrigeration device is provided with below the de-watering apparatus.
3. pretreating device according to claim 1, it is characterised in that:The sample introduction pipeline enters provided with second gas Mouthful, the second gas entrance is arranged between sample water inlet and the preheating device.
4. pretreating device according to claim 1, it is characterised in that:The gas collection pipe enters provided with third gas Mouthful, the third gas entrance is arranged between chromatograph and the de-watering apparatus.
5. pretreating device according to claim 4, it is characterised in that:The de-watering apparatus is provided with primary heater.
6. pretreating device according to claim 1, it is characterised in that:The lid is provided with secondary heater.
7. pretreating device according to claim 1, it is characterised in that:The outer wall parcel thermal insulating material of the purging container Material.
CN201621494324.6U 2016-12-30 2016-12-30 The pretreating device that volatile organic matter is monitored on-line in water Active CN206440675U (en)

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Application Number Priority Date Filing Date Title
CN201621494324.6U CN206440675U (en) 2016-12-30 2016-12-30 The pretreating device that volatile organic matter is monitored on-line in water

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109459544A (en) * 2018-09-20 2019-03-12 北京雪迪龙科技股份有限公司 The system and method for volatile organic matter in a kind of on-line monitoring water
CN114324719A (en) * 2021-12-20 2022-04-12 杭州谱育科技发展有限公司 Online detection method and device for peculiar smell in water body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109459544A (en) * 2018-09-20 2019-03-12 北京雪迪龙科技股份有限公司 The system and method for volatile organic matter in a kind of on-line monitoring water
CN114324719A (en) * 2021-12-20 2022-04-12 杭州谱育科技发展有限公司 Online detection method and device for peculiar smell in water body

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