CN203941173U - VOCs in-line analyzer in a kind of water - Google Patents
VOCs in-line analyzer in a kind of water Download PDFInfo
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- CN203941173U CN203941173U CN201320882298.4U CN201320882298U CN203941173U CN 203941173 U CN203941173 U CN 203941173U CN 201320882298 U CN201320882298 U CN 201320882298U CN 203941173 U CN203941173 U CN 203941173U
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Abstract
The utility model relates to VOCs in-line analyzer in a kind of water based on purge and trap-gas chromatography principle.Specifically auto injection, purge and trap pre-treatment, gas chromatographic analysis function are attached to an instrument.Water sample, after automatic sampling apparatus quantitative sample injection, is controlled sweep gas water sample is purged, and the VOCs in water is water Matrix separation after purging, and the trap that is captured traps; Switch stream by transfer valve, make gas chromatograph carrier gas through collecting trap, simultaneously by the organism of collecting trap moment intensification Dissociative adsorption, carrier gas subsequently enters gas chromatographic analysis module compartment analysis with the organism of resolving.Because each module is simultaneously by the microprocessor control of VOCs in-line analyzer in water, control software and possess control instrument operation and data acquisition and processing capacity simultaneously, realize unified control, reduce and postpone and function conflict.This apparatus structure is simple, it is simple and easy to operate, and realized the sampling of VOCs in water, pre-service and on-line analysis simultaneously.
Description
Technical field
The utility model relates to on-line monitoring Instrument technology field, particularly VOCs in-line analyzer in a kind of water.
Background technology
Volatile organic matter in environment water (VOCs) content low (μ g/L～ng/L), volatile, quantitative analysis difficult.Adopt high sensitivity instrument, develop new pretreatment technology and can solve this difficult problem.
The analytical instrument occurring is in the market not enough to the VOCs in direct-detection water, so it is very crucial that study sample pretreatment process becomes.What traditional laboratory investigations method adopted is that liquid-liquid extraction (LLE) and Solid-Phase Extraction (SPE) exist obvious inferior position: the former uses a large amount of organic solvents in a large number, easily produces emulsion, need to further concentrate, low to volatile organic compound sensitivity; The latter's processing procedure is loaded down with trivial details, solid-phase microextraction post costliness, and cost is higher.Volatile organic compounds is of a great variety, and Drinking Water in China water source has been subjected to a certain degree and has polluted, and directly affects the mankind's life and health.
Current, some important indexs of potable water all rely on regularly spot sampling and the lab analysis of fixed point, and because lab analysis pre-treatment bothers very much, analytical cycle is longer, the support data that cannot obtain a large amount of early warning and monitoring, are difficult to tackle sudden organic pollution event.
Therefore, develop in a kind of water VOCs on-line analysis equipment significant.
Utility model content
In view of this, the utility model provides VOCs in-line analyzer in a kind of water, can obtain in real time, volatile organic matter Monitoring Data accurately, thereby grasp pollution situation and variation tendency that water head site faces comprehensively, analyze pollution cause, shoot the arrow at the target, formulate rationally effectively control measures.
For achieving the above object, the utility model provides following technical scheme:
VOCs in-line analyzer in a kind of water, is formed by auto injection module, scavenging duct, six direction changeover valves, trapping module, chromatographic column module, detector module and control system set;
Described control system comprises the control module that is respectively used to control auto injection, described six direction changeover valve state switchings, described trapping module, described chromatographic column module and described detector module, and Coordination module and control software;
The wherein airtight control of the control module of auto injection and described trapping module and add heat control and all adopt sequential logic, control module and the opening of described trapping module of described six direction changeover valve states switchings, described chromatographic column module and described detector module are controlled the mode that adopts temperature feedback and sequential logic combination, and the signal of described temperature comes from the temperature sensor in described trapping module, described chromatographic column module and described detector module;
Described Coordination module is connected between described control software and each control module, described control software by RS-485 bus, adopt that MODBUS communications protocol is connected with described Coordination module, communication, possess control instrument operation and data acquisition and processing capacity by described control software simultaneously.
Preferably, the control module of described auto injection comprises three-way solenoid valve, sample introduction two three-way electromagnetic valves and overflow two three-way electromagnetic valves;
Described three-way solenoid valve is arranged on the main line of described auto injection module, two imports of described three-way solenoid valve are communicated with respectively water sample entrance and standard specimen entrance, the outlet of described three-way solenoid valve is communicated in the entrance of sample introduction drive unit, and the two ends of described sample introduction two three-way electromagnetic valves are communicated in respectively the outlet of described sample introduction drive unit and the injection port of described scavenging duct;
On the sidewall of described scavenging duct, offer the flow structure for quantitative sample injection, one end of described overflow two three-way electromagnetic valves is communicated in the outlet of described flow structure.
Preferably, described sample introduction drive unit adopts peristaltic pump, syringe pump or pulse pump.
Preferably, described trapping module comprises collecting trap and heater block; The control module of described trapping module comprises: be arranged on temperature inductor on described heater block, be connected in 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, realized the airtight of described trapping module and opened by above-mentioned two two three-way electromagnetic valves.
Preferably, described collecting trap is to be wound around the bolt shape hollow tube of described heater block, and the material that inside pipe wall applies can be: wherein one or several of Tenax, Carbopack C, Carbopack B, Carboxen-1000, Carboxen-1001 are in conjunction with composition.
Preferably, the aperture of described collecting trap is not more than 0.5mm.
Preferably, described chromatographic column module comprises chromatographic column and heating accessory, and one end of described chromatographic column is communicated in chromatographic column entrance, and the other end is communicated in chromatographic column outlet; The control module of described chromatographic column module comprises temperature inductor and temperature control circuit board;
Described chromatographic column is capillary column structure, and the diameter of its spiral is 5cm-20cm.
Preferably, described heating accessory comprises heater strip and the heat conducting fiber of wire, and described heater strip and described heat conducting fiber are together coiled into circle shape with described chromatographic column, and is surrounded by airtight aluminium foil in the above-mentioned circle structural outer being coiled into.
Preferably, described chromatographic column adopting DB-1, HP-5, DM-AQUA quartz capillary column, its length is between 30-60 rice, and thickness is between 0.25-5 μ m, and internal diameter is between 0.25-0.53mm.
Preferably, described chromatographic column adopting DM-AQUA quartz capillary column, length is 60m, and internal diameter is 0.32mm, and thickness is 1.4 μ m.
Can find out from above-mentioned technical scheme, VOCs in-line analyzer in the water that the utility model provides, by the integration to each functional module, by auto injection, purge and trap pre-treatment, gas chromatographic analysis function is attached to an instrument, and there is the automatic control system of whole workflow of covering, with in prior art, need multiple independent equipment and rely on compared with artificial step-by-step operation, due to auto injection module, purge and trap module, the gas chromatographic analysis module while is by the microprocessor control of VOCs in-line analyzer in water, control software and possess control instrument operation and data acquisition and processing capacity simultaneously, realize unified control, reduce and postpone and function conflict.This apparatus structure is simple, it is simple and easy to operate, and realized the sampling of VOCs in water, pre-service and on-line analysis simultaneously.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of VOCs in-line analyzer in the water that Fig. 1 provides for the utility model embodiment;
The structural representation of the auto injection module that Fig. 2 provides for the utility model embodiment;
The A condition structural representation of two six direction changeover valves that Fig. 3 provides for the utility model embodiment;
The B status architecture schematic diagram of two six direction changeover valves that Fig. 4 provides for the utility model embodiment;
The structural representation of the trapping module that Fig. 5 provides for the utility model embodiment;
The structural representation of the chromatographic column module that Fig. 6 provides for the utility model embodiment;
The structural representation of the carrier gas air feed module that Fig. 7 provides for the utility model embodiment;
The control principle drawing that Fig. 8 provides for the utility model embodiment.
Wherein: 1 is auto injection module, and 1-1 is water sample entrance, and 1-2 is standard specimen entrance, and 1-3 is three-way solenoid valve, and 1-4 is automatically controlled peristaltic pump;
2 is sample introduction two three-way electromagnetic valves, and 3 is stock layout two three-way electromagnetic valves, and 4 is overflow two three-way electromagnetic valves, and 5 is sweep gas entrance, and 6 is two six direction changeover valves, and 6-1 to 6-6 is followed successively by six interfaces of two six direction changeover valves, and 7 is exhausr port, and 8 is carrier gas inlet;
9 is trapping module, and 9-1 is collecting trap, and 9-2 is heater block, and 9-3 is temperature inductor, and 9-4 is temperature control circuit board, and 9-5 and 9-6 are two three-way electromagnetic valves;
10 is chromatographic column module, and 10-1 is chromatographic column entrance, and 10-2 is chromatographic column, and 10-3 is chromatographic column outlet, and 10-4 is heating accessory, and 10-5 is temperature inductor, and 10-6 is temperature control circuit board;
11 is detector module, and 12 is scavenging duct;
13 is carrier gas air feed module, and 13-1 is gas-holder, and 13-2 is for screwing valve, and 13-3 is reduction valve, and 13-4 is pressure maintaining valve, and 13-5 is many qis valve, and 13-6,13-7 are flow stabilizing valve.
Embodiment
The utility model discloses VOCs in-line analyzer in a kind of water, can obtain in real time, volatile organic matter Monitoring Data accurately, thereby grasp pollution situation and the variation tendency that water head site faces comprehensively, analyze pollution cause, shoot the arrow at the target, formulate rationally effectively control measures.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1-Fig. 2, the structural representation of VOCs in-line analyzer in the water that Fig. 1 provides for the utility model embodiment; The structural representation of the auto injection module that Fig. 2 provides for the utility model embodiment; The A condition structural representation of two six direction changeover valves that Fig. 3 provides for the utility model embodiment; The B status architecture schematic diagram of two six direction changeover valves that Fig. 4 provides for the utility model embodiment; The structural representation of the trapping module that Fig. 5 provides for the utility model embodiment; The structural representation of the chromatographic column module that Fig. 6 provides for the utility model embodiment; The structural representation of the carrier gas air feed module that Fig. 7 provides for the utility model embodiment; The control principle drawing that Fig. 8 provides for the utility model embodiment.
VOCs in-line analyzer know-why in water:
Analysis process: water sample is after automatic sampling apparatus quantitative sample injection, and sweep gas purges water sample, the VOCs in water is water Matrix separation after purging, and the trap that is captured traps; Switch stream by transfer valve, make gas chromatograph carrier gas through collecting trap, simultaneously by the organism of collecting trap moment intensification Dissociative adsorption, carrier gas subsequently enters gas chromatographic analysis module with the organism of resolving and carries out compartment analysis.
Control principle: in water, VOCs in-line analyzer, according to function zoning by auto injection module, purge and trap module and gas chromatographic analysis module, is made up of three modules such as signal acquisition module, relay module and thermal modules respectively according to classification of task.In water, between the control software of VOCs in-line analyzer and each module, increase Coordination module control, control software by RS-485 bus, adopt that MODBUS communications protocol is connected with Coordination module, communication, possess control instrument operation and data acquisition and processing capacity by controlling software simultaneously, can be with reference to shown in Fig. 8.
Concrete, VOCs in-line analyzer in the water that the utility model embodiment provides, its core improvement is, is formed by auto injection module 1, scavenging duct 12, six direction changeover valves 6, trapping module 9, chromatographic column module 10, detector module 11 and control system set;
Control system comprises the control module that is respectively used to control auto injection, six direction changeover valve 6 states switchings, trapping module 9, chromatographic column module 10 and detector module 11, and Coordination module and control software;
Wherein the control module of auto injection all adopts sequential logic with trapping the airtight control of module 9 and adding heat control, in the above-mentioned module action of default time point control;
Six direction changeover valve 6 states switch, the control module of chromatographic column module 10 and detector module 11 and opening of trapping module 9 are controlled the mode that adopts temperature feedback and sequential logic combination, can be specially control action after the special time period that reaches preset temperature in this programme; Wherein the signal of temperature comes from the temperature sensor in trapping module 9, chromatographic column module 10 and detector module 11;
Coordination module is connected to be controlled between software and each control module, control software by RS-485 bus, adopt that MODBUS communications protocol is connected with Coordination module, communication, possess control instrument operation and data acquisition and processing capacity by control software simultaneously.
Can find out from above-mentioned technical scheme, VOCs in-line analyzer in the water that the utility model embodiment provides, by the integration to each functional module, by auto injection, purge and trap pre-treatment, gas chromatographic analysis function is attached to an instrument, and there is the automatic control system of whole workflow of covering, with in prior art, need multiple independent equipment and rely on compared with artificial step-by-step operation, due to auto injection module, purge and trap module, the gas chromatographic analysis module while is by the microprocessor control of VOCs in-line analyzer in water, control software and possess control instrument operation and data acquisition and processing capacity simultaneously, realize unified control, reduce and postpone and function conflict.This apparatus structure is simple, it is simple and easy to operate, and realized the sampling of VOCs in water, pre-service and on-line analysis simultaneously.Can realize VOCs on-line monitoring in water, miniaturization, automaticity high, high, the continuous monitoring of intelligent degree, automatic calibration, running log record etc. automatically.When conventional analysis, according to sequential logic, also has single-point control simultaneously.Unconventional while making sample, can be by controlling the reference mark in control instrument in software.In fact, conventional analysis is in control software, established methodology to be set in reference mark according to one to carry out fill order.
In the specific embodiment providing at this programme, the control module of auto injection comprises three-way solenoid valve 1-3, sample introduction two three-way electromagnetic valves 2 and overflow two three-way electromagnetic valves 4, and its structure can be with reference to shown in Fig. 1 and 2;
Three-way solenoid valve 1-3 is arranged on the main line of auto injection module 1, two imports of this three-way solenoid valve 1-3 are communicated with respectively water sample entrance 1-1 and standard specimen entrance 1-2, the outlet of three-way solenoid valve 1-3 is communicated in the entrance of sample introduction drive unit, and the two ends of sample introduction two three-way electromagnetic valves 2 are communicated in respectively the outlet of sample introduction drive unit and the injection port of scavenging duct 12;
On the sidewall of scavenging duct 12, offer the flow structure for quantitative sample injection, one end of overflow two three-way electromagnetic valves 4 is communicated in the outlet of flow structure, has realized quantitative sample injection by flow structure simple in structure.
It is all feasible that the employing of sample introduction drive unit peristaltic pump, syringe pump or pulse pump etc. can be realized the parts of electrokinetic injection, and wherein peristaltic pump is preferably, as shown in the automatically controlled peristaltic pump 1-4 in Fig. 2.
Further, between the injection port (being specially bottom here) of sample introduction two three-way electromagnetic valves 2 and scavenging duct 12, be also provided with stock layout two three-way electromagnetic valves 3, under the effect of control system, can realize the stock layout of scavenging duct 12.
In the specific embodiment providing at this programme, trapping module 9 comprises collecting trap 9-1 and heater block 9-2; Trapping module 9 control module comprise: be arranged on 9-2 on heater block temperature inductor 9-3, be connected in the temperature control circuit board 9-4 of temperature inductor 9-3 and be separately positioned on the inlet end of collecting trap 9-1 and two two three-way electromagnetic valve 9-5 and 9-6 of endpiece, realized the airtight of trapping module 9 and opened by above-mentioned two two three-way electromagnetic valves, its structure can be with reference to shown in Fig. 5.
Collecting trap can 9-1 to be U-shaped, spirality, the various shapes such as straight, the material that inside pipe wall applies can be: wherein one or several of Tenax, Carbopack C, Carbopack B, Carboxen-1000, Carboxen-1001 are in conjunction with composition.As preferably, material selection Carbopack B, Carboxen-1000 or the Carboxen-1001 of coated inside, collecting trap 9-1 is the bolt shape hollow tube that is wound around heater block 9-2, can effectively extend gas mobile hold-up time in collecting trap 9-1 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 this process, improve the efficiency of whole analyzing and testing.
In order further to optimize above-mentioned technical scheme, the aperture of collecting trap 9-1 is not more than 0.5mm.Compared with structure of the prior art, by reduced bore, in the situation that carrier gas is identical, can take away more efficiently sooner VOCs wherein, thereby ensure the accuracy of testing result.
In the specific embodiment providing at this programme, chromatographic column module 10 comprises chromatographic column 10-2 and heating accessory 10-4, and one end of this chromatographic column 10-2 is communicated in chromatographic column entrance 10-1, and the other end is communicated in chromatographic column outlet 10-3; The control module of chromatographic column module 10 comprises temperature inductor and 10-5 temperature control circuit board 10-6;
Chromatographic column 10-2 is capillary column structure, and the diameter of its spiral is 5cm-20cm, preferably 8cm.Compared with the chromatograph bulky with complex structure of the prior art, chromatographic column module 10 in this programme has obtained great simplification, by reducing the diameter of bolt of chromatographic column 10-2, can reduce to heat volume and reduction printer body long-pending, can more concentratedly absorb more efficiently heat, be heated evenly, take up room less, make it meet this programme by each module integrated volume requirement in an instrument; On the other hand, because the overall volume of chromatographic column module 10 diminishes, the heat amount that its inside can store reduces, the reduction consuming time that makes its heating and utilize its built-in fans to lower the temperature.
Current chromatograph is by the element heating of device inwall, does heat conduction by air as medium to chromatographic column, ensures the being heated evenly property of chromatographic column by this mode.In order further to optimize above-mentioned technical scheme, heating accessory 10-4 comprises heater strip and the heat conducting fiber of wire, these heater strips and heat conducting fiber are together coiled into circle shape with chromatographic column 10-2, the about 10cm of diameter left and right, but wherein chromatographic column 10-2 longer around circle more; Meanwhile, after complete, outside is got up airtight with Aluminium Foil Package.By linear heater strip and heat conducting fiber and chromatographic column 10-2 are together wound around, the more close chromatographic column 10-2 of heater strip, has improved the efficiency of heating, and the effect of heat conducting fiber is that the heat on heater strip is transmitted on each chromatographic column 10-2 uniformly.
Chromatographic column 10-2 selects according to the substance classes of monitoring: DB-1, HP-5, DM-AQUA or other equivalent quartz capillary columns, and its length is between 30-60 rice, and thickness is between 0.25-5 μ m, and internal diameter is between 0.25-0.53mm.As preferably, to compose post and adopt DM-AQUA quartz capillary column, length is 60m, and internal diameter is 0.32mm, and thickness is 1.4 μ m.
The structure of carrier gas air feed module 13 can be with reference to shown in Fig. 7, and wherein, 13-1 is gas-holder, and 13-2 is for screwing valve, and 13-3 is reduction valve, and 13-4 is pressure maintaining valve, and 13-5 is the many qis valve for shunting, and 13-6 and 13-7 are flow stabilizing valve.
In conjunction with said structure, in the water that this programme provides, VOCs in-line analyzer is mainly analyzed and is detected VOCs in water by following four steps:
(1) sample introduction: open water sample entrance 1-1 by controlling three-way solenoid valve 1-3, utilize automatically controlled peristaltic pump 1-4 that water sample or standard model are pumped into scavenging duct 12, realize accurate quantification sample introduction by overflow two three-way electromagnetic valves 4 that pump into excessive sample and controlling water kick;
(2) purge: carrier gas air feed module 13 purges toward scavenging duct 12 by sweep gas entrance 5, now two six-way valves 6 are controlled at 6-A state, VOCs in water sample is along with sweep gas flows to trapping module 9, and VOCs is adsorbed in collecting trap 9-1, and sweep gas is discharged by exhausr port 7 as waste gas;
(3) resolve: first airtight trapping module 9, is heated to rapidly suitable resolution temperature.Control two six-way valves 6 at 6-B state, open trapping module 9 and make the carrier gas of carrier gas inlet 8 switch to the collecting trap 9-1 that flows through, VOCs enters stratographic analysis module with carrier gas after resolving and carries out compartment analysis;
(4) data acquisition and processing (DAP): the detection signal of detecting device is simulating signal, simulating signal is converted to digital signal through ADC, carry out spectrogram drafting, analysis and calculation by controlling software, in conjunction with controlling default typical curve in software, organism is carried out to qualitative and quantitative analysis.
Concrete, scavenging duct 12 can be the plastics such as quartz, glass, PC;
Two six direction changeover valves 6 can be pneumatic, can be electronic;
It is PEEK, the PTFE of 1/16 or 1/8 inch or the spool of other equal chemical property that pipeline between auto injection module 1 and scavenging duct 12 can adopt external diameter;
It is stainless-steel tube or the copper pipe of 1/16 or 1/8 inch that all gas circuits all can adopt external diameter;
Two six direction changeover valves 6 and six direction changeover valves 6 are controlled to the gas piping temperature between chromatographic column module 10, between temperature range 40-80 DEG C (preferably 50 DEG C);
Detecting device according to the substance classes of monitoring can be: ECD, FID, PID, MAID etc. (air feed of detecting device does not embody, and composition structure is not counted accurately);
Certainly, in this programme, involved instrument size can design according to demand.
In sum, the utility model relates to VOCs in-line analyzer in a kind of water based on purge and trap-gas chromatography principle, belongs to on-line monitoring Instrument technology field.Specifically auto injection, purge and trap pre-treatment, gas chromatographic analysis function are attached to an instrument.Water sample, after automatic sampling apparatus quantitative sample injection, is controlled sweep gas water sample is purged, and the volatile organic matter in water is water Matrix separation after purging, and the trap that is captured traps; Switch stream by transfer valve, make gas chromatograph carrier gas through collecting trap, simultaneously by the organism of collecting trap moment intensification Dissociative adsorption, carrier gas subsequently enters gas chromatographic analysis module with the organism of resolving and carries out compartment analysis.Because auto injection module, purge and trap module, gas chromatographic analysis module are simultaneously by the microprocessor control of VOCs in-line analyzer in water, control software and possess control instrument operation and data acquisition and processing capacity simultaneously, realize unified control, reduce and postpone and function conflict.This apparatus structure is simple, it is simple and easy to operate, and realized the sampling of VOCs in water, pre-service and on-line analysis simultaneously.
(1) water sample automatically taking water, sampling technique have been realized;
(2) realized continuous water sample pretreatment technology;
(3) realized VOCs on-line quick detection in water;
(4) realized the automatic analysis of VOCs Monitoring Data in water;
(5) realized the automatic transmission of VOCs Monitoring Data in water.
In the water that the utility model provides, VOCs in-line analyzer has advantages of following:
(1) the utility model possesses the functions such as automatic sampling, pre-service, automatic analysis, improves the detection efficiency of VOCs in water;
(2) automatic online detects, and without manual operation, reduces testing cost;
(3) instrument can, by network by Surveillance center's platform Long-distance Control, be applicable to unmanned;
(4) can monitor by predetermined period, uninterruptedly monitoring, increases work efficiency greatly;
(5) instrument can generate sampling-pre-service-sample introduction-analyze the daily record of whole process automatically, is conducive to on-line analysis fault and examination data validity;
(6) the utility model possesses robotization, intelligent degree is high, is applicable to the continuous automatic on-line monitoring of VOCs in basin water, can accumulate a large amount of Monitoring Data, grasps water quality overall condition, analyzes change of water quality trend;
(7) the utility model instrument is low in energy consumption, easy to operate, accuracy is high, is applicable to emergency monitoring and the mobile monitoring of VOCs in water.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a VOCs in-line analyzer in water, is characterized in that, is formed by auto injection module, scavenging duct, six direction changeover valves, trapping module, chromatographic column module, detector module and control system set;
Described control system comprises the control module that is respectively used to control auto injection, described six direction changeover valve state switchings, described trapping module, described chromatographic column module and described detector module, and Coordination module;
The wherein airtight control of the control module of auto injection and described trapping module and add heat control and all adopt sequential logic, control module and the opening of described trapping module of described six direction changeover valve states switchings, described chromatographic column module and described detector module are controlled the mode that adopts temperature feedback and sequential logic combination, and the signal of described temperature comes from the temperature sensor in described trapping module, described chromatographic column module and described detector module;
Described Coordination module is connected in each control module.
2. VOCs in-line analyzer in water according to claim 1, is characterized in that, the control module of described auto injection comprises three-way solenoid valve, sample introduction two three-way electromagnetic valves and overflow two three-way electromagnetic valves;
Described three-way solenoid valve is arranged on the main line of described auto injection module, two imports of described three-way solenoid valve are communicated with respectively water sample entrance and standard specimen entrance, the outlet of described three-way solenoid valve is communicated in the entrance of sample introduction drive unit, and the two ends of described sample introduction two three-way electromagnetic valves are communicated in respectively the outlet of described sample introduction drive unit and the injection port of described scavenging duct;
On the sidewall of described scavenging duct, offer the flow structure for quantitative sample injection, one end of described overflow two three-way electromagnetic valves is communicated in the outlet of described flow structure.
3. VOCs in-line analyzer in water according to claim 2, is characterized in that, described sample introduction drive unit adopts peristaltic pump, syringe pump or pulse pump.
4. VOCs in-line analyzer in water according to claim 1, is characterized in that, described trapping module comprises collecting trap and heater block; The control module of described trapping module comprises: be arranged on temperature inductor on described heater block, be connected in 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, realized the airtight of described trapping module and opened by above-mentioned two two three-way electromagnetic valves.
5. VOCs in-line analyzer in water according to claim 4, it is characterized in that, described collecting trap is the bolt shape hollow tube that is wound around described heater block, and the material that inside pipe wall applies is: Tenax, Carbopack C, Carbopack B, Carboxen-1000, Carboxen-1001 one wherein.
6. VOCs in-line analyzer in water according to claim 5, is characterized in that, the aperture of described collecting trap is not more than 0.5mm.
7. according to VOCs in-line analyzer in the water described in claim 1-6 any one, it is characterized in that, described chromatographic column module comprises chromatographic column and heating accessory, and one end of described chromatographic column is communicated in chromatographic column entrance, and the other end is communicated in chromatographic column outlet; The control module of described chromatographic column module comprises temperature inductor and temperature control circuit board;
Described chromatographic column is capillary column structure, and the diameter of its spiral is 5cm-20cm.
8. VOCs in-line analyzer in water according to claim 7, it is characterized in that, described heating accessory comprises heater strip and the heat conducting fiber of wire, described heater strip and described heat conducting fiber are together coiled into circle shape with described chromatographic column, and are surrounded by airtight aluminium foil in the above-mentioned circle structural outer being coiled into.
9. VOCs in-line analyzer in water according to claim 8, it is characterized in that, described chromatographic column adopting DB-1, HP-5, DM-AQUA quartz capillary column, its length is between 30-60 rice, thickness is between 0.25-5 μ m, and internal diameter is between 0.25-0.53mm.
10. VOCs in-line analyzer in water according to claim 9, is characterized in that, described chromatographic column adopting DM-AQUA quartz capillary column, and length is 60m, and internal diameter is 0.32mm, and thickness is 1.4 μ m.
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| CN201320882298.4U CN203941173U (en) | 2013-12-30 | 2013-12-30 | VOCs in-line analyzer in a kind of water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807899A (en) * | 2015-04-07 | 2015-07-29 | 上海大学 | On-line analysis device for volatile carbonyl compounds |
| CN106110689A (en) * | 2016-06-27 | 2016-11-16 | 天津市鹏翔科技有限公司 | Multichannel trace carrying devices and method |
| CN104359719B (en) * | 2014-12-09 | 2017-06-06 | 苏州汉能环保材料科技有限公司 | Volatile organic matter nanometer continuous sampler in a kind of water |
-
2013
- 2013-12-30 CN CN201320882298.4U patent/CN203941173U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359719B (en) * | 2014-12-09 | 2017-06-06 | 苏州汉能环保材料科技有限公司 | Volatile organic matter nanometer continuous sampler in a kind of water |
| CN104807899A (en) * | 2015-04-07 | 2015-07-29 | 上海大学 | On-line analysis device for volatile carbonyl compounds |
| CN106110689A (en) * | 2016-06-27 | 2016-11-16 | 天津市鹏翔科技有限公司 | Multichannel trace carrying devices and method |
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