CN103713071B - The online pretreating device of VOCs in a kind of water - Google Patents
The online pretreating device of VOCs in a kind of water Download PDFInfo
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Abstract
The invention discloses the online pretreating device of VOCs in a kind of water, is that the functions such as centralized procurement sample, enrichment, thermal desorption, blowback sample introduction are in the online pretreating device of VOCs of one.Directly can be used in conjunction with gas chromatograph, complete the on-line monitoring of volatile organic matter in water.Device adopts Modular Structure Design, completes different processes by Vavle switching.Automatically carry out discharging of waste liquid and the cleaning of sample pipe after the automatic pre-service of this device, pipeline purification can be carried out with the aging online of adsorption column simultaneously, does not interfere with each other, shortens analytical cycle.Apparatus structure is succinct, it is simple and easy, economical and practical to operate, and do not need extra de-watering apparatus and automatic sampler, is highly suitable for on-the-spot water quality VOCs on-line continuous monitoring.
Description
Technical field
The present invention relates to on-line monitoring instrument technical field, particularly the online pretreating device of VOCs in a kind of water.
Background technology
Volatile organic matter (VOCs) common are organic pollutants in a class water, and they are mainly derived from plant chimney stalk discharge, urban sewage discharge and disinfection of tap water.Volatile organic matter has high volatile volatile, lipides solubility, easily by the absorption such as skin, mucous membrane, simultaneously many VOCs can carcinogenic, teratogenesis or mutagenesis, its harmfulness is very big, therefore carries out on-line checkingi to VOCs in Environmental Water very necessary, is convenient to the change reflecting water quality in real time.
In environment water, volatile organic content is low, carries out directly measuring extremely difficult, suitable sample-pretreating method must be selected to carry out separation and concentration, reach the detectability of analytical instrument it.Traditional pretreatment technology comprises liquid phase, solid phase and gas extraction, but liquid-phase extraction in a large number with an organic solvent, secondary pollution is caused to environment, easily produces emulsion, need to concentrate further, volatile organic compound loss is serious, is difficult to accurate quantitative analysis; Solid-Phase Extraction processing procedure bothers, and solid-phase microextraction post use cost is higher; The online pre-treatment realizing volatile organic contaminant in potable water is all difficult to simultaneously.
Gas extraction comprises two kinds of patterns, is respectively: Static Headspace, purge and trap (i.e. Dynamic headspace).The shortcoming of Static Headspace is that analysis time is long, often needs large volume sample injection for improving sensitivity, and cause the initial broadening of the chromatographic peak of volatile organic matter comparatively large, in sample introduction process, volatile organic matter condensation in tube wall or syringe, exists memory effect, detect limit for height.Purge and trap is high with its bioaccumulation efficiency, pollute the advantages such as little, easy and simple to handle; be widely used in environment water VOCs to analyze; Environmental Protection Agency (USEnvironmentalProtectionAgency at present; US-EPA) proposed standard method; but purge and trap instrument mostly is external import instrument at present, and domestic not yet have maturing apparatus.External import instrument is expensive, and use cost is higher.Purge and trap instrument need carry automatic sampler, the complex structure of usual automatic sampler, expensive equipment, and automatic sampler is by sample bottle position sample introduction, needs artificial participation for sample, not to be suitable for unattended on-line monitoring.
Therefore, for above-mentioned situation, how really to realize unattended auto injection, become the important technological problems that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
In view of this, the invention provides the online pretreating device of VOCs in a kind of water, namely the device that becomes one of on-line sampling, enrichment, thermal desorption, blowback sample introduction, directly can be used in conjunction with gas chromatograph, complete the on-line monitoring of volatile organic matter in water.
For achieving the above object, the invention provides following technical scheme:
The online pretreating device of VOCs in a kind of water, comprises sample introduction and purges module, two six direction changeover valves, trapping module and control system;
Described sample introduction purges module and comprises water sample pipe and be set in the scavenging duct in described water sample pipe, and the sidewall of described water sample pipe offers sample water inlet and overflow vent, and the bottom of described water sample pipe offers freeing port, the top of described scavenging duct offers the trapping entrance for being communicated with described two six direction changeover valves, the bottom of described scavenging duct is communicated in described water sample pipe, the sidewall of described scavenging duct offers the liquid level hole for being communicated with described water sample pipe, the height of cleaning gas tube outlet in described scavenging duct is lower than the height in described liquid level hole, and the diapire design height of described overflow vent can make the liquid level in described scavenging duct not higher than quantitative water sample height, the height in described liquid level hole is lower than described overflow vent height, the outlet of described overflow vent is in the floss hole for effluent discharge,
Described control system comprises the control module being respectively used to control described sample introduction purging module, described two six direction changeover valves and described trapping module; The control module that wherein said sample introduction purges module comprises the electrical ball valve between outlet and described floss hole being arranged on described freeing port, with the level sensor be arranged in described water sample pipe, the height of described level sensor is between the height and the height in described liquid level hole of described overflow vent.
Preferably, be communicated in the sample feeding pipe between described water sample pipe and monitoring water sample, its in the vertical direction entrance point is higher than endpiece, the radial direction of described water sample pipe and described sample feeding pipe staggers in the horizontal direction, be close to the tangent direction of described water sample inside pipe wall, coordinate for cut-in type designs with described sample water inlet.
Preferably, multiple described sample water inlet is uniformly distributed along its circumference on the sidewall of described water sample pipe, and multiple described sample feeding pipe is about the central shaft Central Symmetry of described water sample pipe.
Preferably, the height of described sample water inlet is lower than the height of water level of monitoring water sample, or described sample introduction purging module comprises sample introduction drive unit.
Preferably, the first hand valve often opened is provided with between described freeing port and described electrical ball valve.
Preferably, be also provided with another path with described electrical ball valve parallel connection between described first hand valve and described floss hole, and on this path, be provided with the second normally closed hand valve.
Preferably,
Described sample introduction purges the control module of module and the airtight control of described trapping module and computer heating control thereof and all adopts sequential logic, the mode opening control employing feedback of status and temperature feedback combination of described two six direction changeover valve states switchings and described trapping module, the signal of described temperature comes from the temperature inductor in described trapping module;
Described control system also comprises feedback of status module for connecting gas chromatograph and operation control module, described feedback of status module is used for obtaining above-mentioned status signal from described gas chromatograph, and described operation control module is used for sending operating instruction to described gas chromatograph while described two six direction changeover valves switch to B state by A condition;
Described control system also comprises Coordination module and control software design; Described Coordination module is connected between described control software design and each control module, described control software design by RS-485 bus, adopt that MODBUS communications protocol is connected with described Coordination module, communication, possess control instrument by described control software design simultaneously and operate and data acquisition and processing capacity.
Preferably, described control system also comprises three-way solenoid valve, and two imports of described three-way solenoid valve are communicated with cleaning gas entrance and described trapping entrance respectively, and the outlet of described three-way solenoid valve is in described two six direction changeover valves.
Preferably, described trapping module comprises collecting trap and heater block; The control module of described trapping module comprises: be arranged on the temperature inductor on described heater block, be connected to the temperature control circuit board of described temperature inductor and be separately positioned on the inlet end of described collecting trap and two two three-way electromagnetic valves of endpiece, realizes the airtight of described trapping module and open by above-mentioned two two three-way electromagnetic valves.
Preferably, described collecting trap is the bolt shape hollow tube being wound around described heater block, the material of inside pipe wall coating can be: Tenax, CarbopackC, CarbopackB, Carboxen-1000, Carboxen-1001 one or several combination compositions wherein, the aperture of described collecting trap is not more than 0.5mm.
As can be seen from above-mentioned technical scheme, the online pretreating device of VOCs in water provided by the invention, purging module by devising unique sample introduction, not needing matching used automatic sampler, just can realize sample introduction and purge and trap function; Structure letter is answered, easy to use; Sample introduction is accurate, does not consume or consumes less power; Sample introduction and pre-service can be carried out continuously according to program setting, be suitable for unattended on-line monitoring; Instrument passes through software control, complete documentation pretreatment process.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the online pretreating device of VOCs in the water that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the purging sample introduction module that Fig. 2 provides for the embodiment of the present invention;
The A condition structural representation of two six direction changeover valves that Fig. 3 provides for the embodiment of the present invention;
The B status architecture schematic diagram of two six direction changeover valves that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the trapping module that Fig. 5 provides for the embodiment of the present invention;
The control principle drawing that Fig. 6 provides for the embodiment of the present invention.
Wherein: 1 for purging sample introduction module, and 1-1 is sample water inlet, and 1-2 is water sample pipe, and 1-3 is freeing port, 1-4 is trapping entrance, and 1-5 is overflow vent, and 1-6 is liquid level hole, and 1-7 is scavenging duct;
2 is the first hand valve, and 3 is electrical ball valve, and 4 is the second hand valve, and 5 is floss hole, and 6 is level sensor, and 7 is sweep gas entrance, and 8 is cleaning gas entrance, and 9 is two six direction changeover valves;
10 is trapping module, and 10-1 is collecting trap, and 10-2 is heater block, and 10-3 is temperature inductor, and 10-4 is temperature control circuit board, and 10-5,10-6 are two three-way electromagnetic valves;
11 is three-way solenoid valve, and 12 is sampling pump, and 13 is three-way solenoid valve, and 14 is gas chromatograph, and 15 is source of the gas, and 16 is flow controller, and 17 is many qis valve, and 18 is the carrier gas inlet of gas chromatography.
Embodiment
The invention discloses the online pretreating device of VOCs in a kind of water, namely the device that becomes one of on-line sampling, enrichment, thermal desorption, blowback sample introduction, directly can be used in conjunction with gas chromatograph, complete the on-line monitoring of volatile organic matter in water.。
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1-Fig. 6, the structural representation of the online pretreating device of VOCs in the water that Fig. 1 provides for the embodiment of the present invention; The structural representation of the purging sample introduction module that Fig. 2 provides for the embodiment of the present invention; The A condition structural representation of two six direction changeover valves that Fig. 3 provides for the embodiment of the present invention; The B status architecture schematic diagram of two six direction changeover valves that Fig. 4 provides for the embodiment of the present invention; The structural representation of the trapping module that Fig. 5 provides for the embodiment of the present invention; The control principle drawing that Fig. 6 provides for the embodiment of the present invention.
The online pretreating device of VOCs in the water that the embodiment of the present invention provides, its core improvement is, comprise sample introduction and purge module 1, two six direction changeover valves 9, trapping module 10 and control system, its structure can with reference to shown in Fig. 1;
Sample introduction purges module 1 and comprises water sample pipe 1-2 and be set in the scavenging duct 1-7 in water sample pipe 1-2, the sidewall of this water sample pipe 1-2 offers sample water inlet 1-1 and overflow vent 1-5, the bottom of water sample pipe 1-2 offers freeing port 1-3, passes through freeing port 1-3 through floss hole 5 directly effluent discharge after water sample test; The top of scavenging duct 1-7 offers the trapping entrance 1-4 for being communicated with two six direction changeover valves 9, the bottom of scavenging duct 1-7 is communicated in water sample pipe 1-2, the sidewall of scavenging duct 1-7 offers the liquid level hole 1-6 be communicated with for same water sample pipe 1-2, the liquid level utilizing linker structure to realize inside and outside scavenging duct 1-7 is unanimous on the whole, the height of sweep gas tube outlet in scavenging duct 1-7 is lower than the height of liquid level hole 1-6, and the diapire design height of overflow vent 1-5 can make the liquid level in scavenging duct 1-7 not higher than quantitative water sample height
Liquid level in scavenging duct 1-7 is decided by overflow vent 1-5, due under sweep gas tube outlet and the unopened situation of trapping entrance 1-4, the top of scavenging duct 1-7 is enclosed construction, under the effect of within it gaseous tension, the static liquid level outline of scavenging duct 1-7 inside is lower than outside (namely in water sample pipe 1-2) static liquid level, namely a little less than the diapire of overflow vent 1-5, difference in height approximates the difference in height of liquid level hole 1-6 roof and overflow vent 1-5 diapire; Certainly, as required by reducing the pressure of scavenging duct 1-7 headspace, the liquid level inside and outside it can be made completely the same, not repeat them here;
Under the effect of sweep gas, dynamic liquid level may higher than static liquid level, therefore in order to avoid affecting the degree of accuracy of net result, the gas entered by sweep gas entrance 7 and the gas of being gone out by trapping entrance 1-4 should be ensured, the amount of both is substantially balanced, to ensure that in purge, the change of scavenging duct 1-7 inside liquid level within limits, namely ensures the quantitative of sample;
The height of liquid level hole 1-6 is lower than the height of overflow vent 1-5, and the outlet of overflow vent 1-5 is in the floss hole 5 for effluent discharge;
Control system comprises the control module being respectively used to control sample introduction purging module 1, two six direction changeover valves 9 and trapping module 10; Wherein the control module of sample introduction purging module 1 comprises the electrical ball valve 3 between outlet and floss hole 5 being arranged on freeing port 1-3, with the level sensor 6 be arranged in water sample pipe 1-2, the height of this level sensor 6 is between the height and the height of liquid level hole 1-6 of overflow vent 1-5.
As can be seen from above-mentioned technical scheme, the online pretreating device of VOCs in the water that the embodiment of the present invention provides, emphasis is scavenging duct and sample feeding pipe, scavenging duct and sample feeding pipe are carried out separating, the scavenging duct of overflow vent and perforate is utilized to make sample introduction very convenient and accurate, do not need matching used automatic sampler, just can realize sample introduction and purge and trap function; Structure is simple, easy to use; Sample introduction is accurate, does not consume or consumes less power; Sample introduction and pre-service can be carried out continuously according to program setting, be suitable for unattended on-line monitoring; Instrument passes through software control, complete documentation pretreatment process.
Device adopts modular design, completes different processes by Vavle switching.Unitary determination is complete to be changed solution by miniature sampling pump and automatically to clean or by the water distribution of automatic monitor station pretreatment system, online aging adsorption column and purification pipeline simultaneously.Pipeline purification can be carried out with the aging online of adsorption column simultaneously, does not interfere with each other, shortens analytical cycle.Apparatus structure is succinct, it is simple and easy, economical and practical to operate, and do not need extra de-watering apparatus and automatic sampler.
As preferably, be communicated in the sample feeding pipe between water sample pipe 1-2 and monitoring water sample, its in the vertical direction entrance point (being namely communicated in one end of monitoring water sample) is higher than endpiece (being namely communicated in one end of water sample pipe 1-2), the radial direction (being greater than 80 degree as preferred both angle) of water sample pipe 1-2 and sample feeding pipe staggers in the horizontal direction, be close to the direction that same water sample pipe 1-2 inwall is tangent, coordinate with sample water inlet 1-1 for cut-in type designs, water sample to enter after water sample pipe 1-2 around tube wall curl, is conducive to cleaning and the Homogeneous phase mixing of water sample pipe 1-2.
In order to optimize above-mentioned technical scheme further, multiple sample water inlet 1-1 is uniformly distributed along its circumference on the sidewall of water sample pipe 1-2, such as to be separated by two of 180 ° or three of adjacent spaces 120 °, and multiple sample feeding pipe is about the central shaft Central Symmetry of water sample pipe 1-2, to clean more fully water sample pipe 1-2 and to mix more uniformly.
Be directed to different quantitative sample injection needs, can arrange multiple overflow vent 1-5 and liquid level hole 1-6, select suitable one group when needs, these are all apparent for those skilled in the art, do not repeat them here.Concrete, water sample pipe 1-2 can be the plastics such as quartz, glass, PC, PVC; For cylindrical transparent matrix.Scavenging duct 1-7 can be two open ends, the pipe, square tube or other shapes that have multiple uniform liquid level hole 1-6.
In the specific embodiment that this programme provides, the various ways such as sample water inlet 1-1 can adopt inflow (having hydraulic pressure), pumps into, suction.Namely the height of sample water inlet 1-1 is lower than the height of water level of monitoring water sample, or sample introduction purging module 1 comprises sample introduction drive unit.
As preferably, the first hand valve 2 often opened is provided with between freeing port 1-3 and electrical ball valve 3, in case of emergency (when such as electrical ball valve 3 cannot be closed), manually can operate the path that the first hand valve 2 cuts out freeing port 1-3 place, improve the reliability of device.
In order to optimize above-mentioned technical scheme further, another path of same electrical ball valve 3 parallel connection is also provided with between first hand valve 2 and floss hole 5, and on this path, be provided with the second normally closed hand valve 4, so that in case of emergency (when such as electrical ball valve 3 cannot be opened), manually operate the second hand valve 4 and open the discharge opeing path of freeing port 1-3 to floss hole 5.
As preferably, the height of sample water inlet 1-1 is lower than the height of liquid level hole 1-6, and its structure can with reference to shown in Fig. 2.
As preferably,
Sample introduction purges the control module of module 1 and the airtight control of trapping module 10 and computer heating control thereof and all adopts sequential logic, namely controls above-mentioned module action at the time point preset; The state of two six direction changeover valves 9 switches and traps the mode opening control employing feedback of status and temperature feedback combination of module 10, can be specially after reaching preset temperature in this programme, the control action when the feedback of status receiving gas chromatograph is Ready; The signal of temperature comes from the temperature inductor in trapping module 10;
Control system also comprises feedback of status module for connecting gas chromatograph 14 and operation control module, and feedback of status module is used for obtaining above-mentioned status signal from gas chromatograph 14, to guarantee that it is in corresponding duty; Operation control module is used for while two six direction changeover valves 9 switch to B state by A condition (namely during blowback sample introduction), sends operating instruction to gas chromatograph 14;
Control system also comprises Coordination module and control software design; Coordination module is connected between control software design and each control module, control software design is connected with Coordination module by RS-485 bus, employing MODBUS communications protocol, communication, possess control instrument operation and data acquisition and processing capacity by control software design, its structure can with reference to shown in Fig. 6 simultaneously.
Control software design loads on industrial computer, and each functional modules such as Coordination module, signal acquisition module, interlocking module, thermal module are controlled by Single Chip Microcomputer (SCM) program, loads on circuit boards.Control software design and Coordination module, Coordination module and and each functional module between adopt RS-485 bus, MODBUS communications protocol carries out communication.
According to sequential logic when conventional analysis, also have single-point to control simultaneously.Unconventional make sample time, can by the reference mark in control instrument in control software design.In fact, conventional analysis in control software design, reference mark is set established methodology according to one to carry out fill order.
In order to optimize above-mentioned technical scheme further, control system also comprises three-way solenoid valve 13, two imports of this three-way solenoid valve 13 are communicated with cleaning gas entrance 8 and trapping entrance 1-4 respectively, the outlet of three-way solenoid valve 13 in two six direction changeover valves 9, to realize flexible switching as required.
Similar, control system also comprises three-way solenoid valve 11, and two outlets of this three-way solenoid valve 11 are communicated with sampling pump 12 and floss hole respectively, and the inlet communication of three-way solenoid valve 11 is in two six direction changeover valves 9.
In the specific embodiment that this programme provides, trapping module 10 comprises collecting trap 10-1 and heater block 10-2; The control module of trapping module 10 comprises: the temperature inductor 10-3 being arranged on 10-2 on heater block, the temperature control circuit board 10-4 being connected to temperature inductor 10-3 and be separately positioned on the inlet end of collecting trap 10-1 and two two three-way electromagnetic valve 10-5 and 10-6 of endpiece, realized the airtight of trapping module 10 by above-mentioned two two three-way electromagnetic valves and opened, its structure can with reference to shown in Fig. 5.
Collecting trap can 10-1 to be U-shaped, spirality, the various shape such as straight, the material of inside pipe wall coating can be: Tenax, CarbopackC, CarbopackB, Carboxen-1000, Carboxen-1001 wherein one or several combine composition.As preferably, material selection CarbopackB, Carboxen-1000 or Carboxen-1001 of coated inside, collecting trap 10-1 is the bolt shape hollow tube being wound around heater block 10-2, the hold-up time that gas flows in collecting trap 10-1 effectively can be extended in this structure of identical situation that takes up room, to occur to react fully with the coating material of its inwall, and then improve the concentration effect of VOCs in the process, improve the whole efficiency analyzing detection.
In order to optimize above-mentioned technical scheme further, the aperture of collecting trap 10-1 is not more than 0.5mm.Compared with structure of the prior art, by reduced bore, when carrier gas is identical, more efficiently can takes away VOCs wherein sooner, thus ensure the accuracy of testing result.
Trapping module 10 temperature-controllable, temperature range is between room temperature-300 DEG C.
Concrete, two six-way valves 9 can be pneumatic, electronic.
All gas circuits all can adopt external diameter to be stainless-steel tube or the copper pipe of 1/16 or 1/8 inch.
Gas piping temperature-controllable between two six direction changeover valves 9 and two six direction changeover valves 9 to gas chromatograph 15, between temperature range 40-80 DEG C (preferably 50 DEG C).
The structure of air feed module of the present invention can with reference to shown in Fig. 1, and wherein, 15 is source of the gas, and 16 is flow controller, and 17 is the many qis valve for shunting, and its control can be realized by control system equally.
Cleaning gas and sweep gas flow controller 16 can adopt conventional mechanical pressure maintaining valve, conventional mechanical flow stabilizing valve, mass flow controller, preheat mechanical pressure maintaining valve, preheat the various flow rate controls such as mechanical flow stabilizing valve.
In conjunction with said structure, in the water that this programme provides, the online pretreating device of VOCs is sampled and pre-treatment to VOCs in water mainly through following 3 steps:
(1) sample introduction: water sample enters water sample pipe 1-2 from sample water inlet 1-1, (as monitoring water sample and sample water inlet 1-1 have water-head namely higher than sample water inlet 1-1, or automatic monitor station has water distribution system, then water sample direct injected) water sample pipe 1-2 is communicated with scavenging duct 1-7, scavenging duct 1-7 upper end liquid level hole 1-6 then ensures that the liquid level of scavenging duct 1-7 and water sample pipe 1-2 is basically identical, lower than overflow vent 1-5 under the obvious vertical state of this liquid level hole 1-6, water sample is by overflow vent 1-5 controlling water level and sample size.Floss hole 5 directly effluent discharge was entered by freeing port 1-3 after water sample test.Being open mode under the usual state of first hand valve 2, is closed condition under the usual state of the second hand valve 4.Under conventional sense, waste liquid is by electrical ball valve 3 control discharge, can be discharged under the emergency circumstance by the second hand valve 4.
(2) enrichment is purged: first control three-way solenoid valve 13 and be connected with two six direction changeover valves 9 for trapping entrance 1-4, these two six direction changeover valves 9 are in 9-A state, open sampling pump 12, the air at scavenging duct 1-7 top is extracted out by sampling pump 12, makes VOCs in water be full of this space; Then controlling three-way solenoid valve 13 is that cleaning gas entrance 8 is connected with two six direction changeover valves 9, utilizes cleaning gas to be purified by pipeline; Then control three-way solenoid valve 13 to be connected with two six direction changeover valves 9 for trapping entrance 1-4, open sweep gas entrance 7 and start to purge, in water, VOCs enters trapping module 10 by enrichment along with sweep gas, and sweep gas is discharged through three-way solenoid valve 11; Finally control three-way solenoid valve 13 to be again connected with two six direction changeover valves 9 for cleaning gas entrance 8, utilize cleaning gas to be dried up by the moisture in pipeline and collecting trap 10-1.
(3) resolve: first airtight trapping module, is heated to rapidly suitable resolution temperature.Control two six-way valves 9 in 9-B state, open trapping module, make the carrier gas of carrier gas inlet 18 switch to blowback collecting trap, VOCs enters stratographic analysis module with carrier gas after resolving and carries out compartment analysis.
In sum, the present invention relates to the online pretreating device of VOCs in a kind of water, is that the functions such as centralized procurement sample, enrichment, thermal desorption, blowback sample introduction are in the online pretreating device of VOCs of one.Directly can be used in conjunction with gas chromatograph, complete the on-line monitoring of volatile organic matter in water.Device adopts Modular Structure Design, completes different processes by Vavle switching.Automatically carry out discharging of waste liquid and the cleaning of sample pipe after the automatic pre-service of this device, pipeline purification can be carried out with the aging online of adsorption column simultaneously, does not interfere with each other, shortens analytical cycle.Apparatus structure is succinct, it is simple and easy, economical and practical to operate, and do not need extra de-watering apparatus and automatic sampler, is highly suitable for on-the-spot water quality VOCs on-line continuous monitoring.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the online pretreating device of VOCs in water, is characterized in that, comprises sample introduction and purges module, two six direction changeover valves, trapping module and control system;
Described sample introduction purges module and comprises water sample pipe and be set in the scavenging duct in described water sample pipe, and the sidewall of described water sample pipe offers sample water inlet and overflow vent, and the bottom of described water sample pipe offers freeing port, the top of described scavenging duct offers the trapping entrance for being communicated with described two six direction changeover valves, the bottom of described scavenging duct is communicated in described water sample pipe, the sidewall of described scavenging duct offers the liquid level hole for being communicated with described water sample pipe, the height of sweep gas tube outlet in described scavenging duct is lower than the height in described liquid level hole, and the diapire design height of described overflow vent can make the liquid level in described scavenging duct not higher than quantitative water sample height, the height in described liquid level hole is lower than described overflow vent height, the outlet of described overflow vent is in the floss hole for effluent discharge,
Described control system comprises the control module being respectively used to control described sample introduction purging module, described two six direction changeover valves and described trapping module; The control module that wherein said sample introduction purges module comprises the electrical ball valve between outlet and described floss hole being arranged on described freeing port, with the level sensor be arranged in described water sample pipe, the height of described level sensor is between the height and the height in described liquid level hole of described overflow vent.
2. the online pretreating device of VOCs in water according to claim 1, it is characterized in that, be communicated in the sample feeding pipe between described water sample pipe and monitoring water sample, its in the vertical direction entrance point is higher than endpiece, the radial direction of described water sample pipe and described sample feeding pipe staggers in the horizontal direction, be close to the tangent direction of described water sample inside pipe wall, coordinate for cut-in type designs with described sample water inlet.
3. the online pretreating device of VOCs in water according to claim 2, is characterized in that, multiple described sample water inlet is uniformly distributed along its circumference on the sidewall of described water sample pipe, and multiple described sample feeding pipe is about the central shaft Central Symmetry of described water sample pipe.
4. the online pretreating device of VOCs in water according to claim 3, is characterized in that, the height of described sample water inlet is lower than the height of water level of monitoring water sample, or described sample introduction purging module comprises sample introduction drive unit.
5. the online pretreating device of VOCs in water according to claim 4, is characterized in that, is provided with the first hand valve often opened between described freeing port and described electrical ball valve.
6. the online pretreating device of VOCs in water according to claim 5, it is characterized in that, also be provided with another path with described electrical ball valve parallel connection between described first hand valve and described floss hole, and on this path, be provided with the second normally closed hand valve.
7. in the water according to claim 1-6 any one, the online pretreating device of VOCs, is characterized in that,
Described sample introduction purges the control module of module and the airtight control of described trapping module and computer heating control thereof and all adopts sequential logic, the mode opening control employing feedback of status and temperature feedback combination of described two six direction changeover valve states switchings and described trapping module, the signal of described temperature comes from the temperature inductor in described trapping module;
Described control system also comprises feedback of status module for connecting gas chromatograph and operation control module, described feedback of status module is used for obtaining status signal from described gas chromatograph, and described operation control module is used for sending operating instruction to described gas chromatograph while described two six direction changeover valve states switch;
Described control system also comprises Coordination module and control software design; Described Coordination module is connected between described control software design and each control module, described control software design by RS-485 bus, adopt that MODBUS communications protocol is connected with described Coordination module, communication, possess control instrument by described control software design simultaneously and operate and data acquisition and processing capacity.
8. the online pretreating device of VOCs in water according to claim 7, it is characterized in that, described control system also comprises three-way solenoid valve, two imports of described three-way solenoid valve are communicated with cleaning gas entrance and described trapping entrance respectively, and the outlet of described three-way solenoid valve is in described two six direction changeover valves.
9. the online pretreating device of VOCs in water according to claim 8, is characterized in that, described trapping module comprises collecting trap and heater block; The control module of described trapping module comprises: be arranged on the temperature inductor on described heater block, be connected to the temperature control circuit board of described temperature inductor and be separately positioned on the inlet end of described collecting trap and two two three-way electromagnetic valves of endpiece, realizes the airtight of described trapping module and open by above-mentioned two two three-way electromagnetic valves.
10. the online pretreating device of VOCs in water according to claim 9, it is characterized in that, described collecting trap is the bolt shape hollow tube being wound around described heater block, the material of inside pipe wall coating is: Tenax, CarbopackC, CarbopackB, Carboxen-1000, Carboxen-1001 one or several combination compositions wherein, the aperture of described collecting trap is not more than 0.5mm.
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| CN106442823A (en) * | 2016-09-14 | 2017-02-22 | 钢研纳克检测技术有限公司 | VOC (volatile organic compound) analyzer with carrier gas regeneration function |
| CN106645520A (en) * | 2016-12-30 | 2017-05-10 | 聚光科技(杭州)股份有限公司 | Pretreatment device and pretreatment method for online monitoring of underwater volatile organic compounds |
| CN106645521B (en) * | 2017-01-13 | 2017-12-19 | 曲阜师范大学 | Pre-treatment sample air lift absorption plant and method based on chromatography |
| CN106946308A (en) * | 2017-04-21 | 2017-07-14 | 广东雪迪龙环境科技有限公司 | A kind of method of VOCs adsorption/desorptions integration apparatus and the wastewater treatment containing VOCs |
| CN108562677A (en) * | 2018-04-20 | 2018-09-21 | 苏州聚阳环保科技股份有限公司 | Device and method based on mass spectrometer on-line checking water quality VOC |
| 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 |
| CN110426480B (en) * | 2019-09-10 | 2024-08-30 | 中绿环保科技股份有限公司 | Real-time on-line monitoring equipment for water quality volatile organic compounds |
| CN110632200B (en) * | 2019-09-27 | 2022-03-01 | 四川师范大学 | Bubble extraction device based on greenhouse gas and method for realizing efficient analysis of volatile components of sample by using bubble extraction device |
| CN113804780A (en) * | 2021-09-03 | 2021-12-17 | 上海炫一智能科技有限公司 | Online chromatographic analysis method for VOCs in water |
| CN116990427B (en) * | 2023-09-21 | 2023-11-24 | 广州顺斡仪表科技有限公司 | Sample injection control device for hydrocarbon analysis |
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| US20040142481A1 (en) * | 2003-01-21 | 2004-07-22 | Hartlein Thomas M. | Foam detection/prevention in the context of a purge and trap sample concentrator |
| US8075842B1 (en) * | 2008-02-27 | 2011-12-13 | EST Analytical, Inc. | Analytical chemical sampling system with sparge vessel |
| CN101949906B (en) * | 2010-08-09 | 2013-11-20 | 四川省环境监测中心站 | Decompressed purge-and-trap processing equipment for non-volatile organic compound in water sample and processing method thereof |
| CN103134875A (en) * | 2011-12-01 | 2013-06-05 | 中国科学院大连化学物理研究所 | On-line pretreatment device of aquatic volatile organic compounds |
| CN102735859B (en) * | 2012-07-13 | 2014-03-19 | 力合科技（湖南）股份有限公司 | Automatic online monitoring method and device for VOCs (volatile organic chemicals) in water |
| CN102998408B (en) * | 2012-12-12 | 2014-12-17 | 宁波市环境监测中心 | Detection device for volatile organic matter in water and detection method |
| CN203275420U (en) * | 2013-04-28 | 2013-11-06 | 力合科技（湖南）股份有限公司 | On-line pretreatment device for detection of VOCs (volatile organic comopunds) in water |
| CN203849228U (en) * | 2013-12-30 | 2014-09-24 | 力合科技（湖南）股份有限公司 | Underwater volatile organic compounds (VOCs) online pretreatment device |
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