CN201548440U

CN201548440U - Fast digestion pneumatic metering sample introduction reaction equipment of COD

Info

Publication number: CN201548440U
Application number: CN2009202231630U
Authority: CN
Inventors: 俞凌
Original assignee: BEIJING ANKONG TECHNOLOGY Co Ltd
Current assignee: BEIJING ANKONG TECHNOLOGY Co Ltd
Priority date: 2009-09-29
Filing date: 2009-09-29
Publication date: 2010-08-11
Anticipated expiration: 2019-09-29

Abstract

The utility model provides a fast digestion pneumatic metering sample introduction reaction equipment of COD, which achieves the aim of metering by adopting relative metering, namely, metering by portions, and setting different proportion parts of a sample introduction reagent, adopts an international advanced liquid transmission mode-pneumatic transmission, has the advantages of low noise, small volumes, long maintenance period and the like, greatly shortens the working time, overcomes dead volume in a metering tube, and improves the working efficiency; a digestion reaction device adopts a mode of heating by a heating sheet, cooling by circulation of cooling water and cooling by a fan, and adopts an incomplete digestion technology, thus shortening the digestion time, and improving the working efficiency of the device. The fast digestion pneumatic metering sample introduction reaction equipment of COD has good metering repeatability, small metering error and high precision.

Description

The quick dispelling pneumatic metering sample feeding reaction unit of COD

Technical field

The utility model relates to the environment supervision instrument field, particularly relates to the quick dispelling pneumatic metering sample feeding reaction unit of a kind of COD.

Background technology

At present, the liquid road transmitting device that chemical oxygen demand (COD) (COD) on-line monitoring instrument adopts is generally the liquid road transmission mode by pump or solenoid control, this transmission mode is lower to the transfer efficiency of liquid, measuring accuracy is not high, in the liquid transfer process, easily deposit raffinate in the liquid line, and on pipeline, form incrustation easily, so have a strong impact on the accuracy of Monitoring Data.

And in COD measured, standard law (GB11914-89) reaction conditions was cleared up oxidation 2 hours for adding the potassium dichromate backflow, added cool time, and the time of visible standard law reaction is oversize, is unsuitable for on-line monitoring.

Summary of the invention

The utility model is in order to solve liquid transfer of the prior art and the not enough shortcoming of gauging instrument precision is finished, and the purpose of this utility model provides a kind of metering good reproducibility, the quick dispelling pneumatic metering sample feeding reaction unit of the COD that error in dipping is little.

The technical solution of the utility model is:

The quick dispelling pneumatic metering sample feeding reaction unit of COD of the present utility model, comprise measuring apparatus and clear up reaction unit, it is characterized in that: described measuring apparatus comprises that one is long and the other is short in measuring container and the measuring container two wire electrodes, the top of described measuring container links to each other with an air pump, the bottom of described measuring container is connected with first drain pipe by first pinch valve, have injection port on the described measuring container, described measuring container front portion is provided with overflow vent, and short wire electrode is mutually neat with the lower edge of overflow vent; The described reaction unit of clearing up comprises digestion tube and external fan, first drain pipe extends down into described digestion tube inside, form the sample introduction pipe, the top of described digestion tube is condenser pipe, its outside is surrounded by cooling jacket, described cooling jacket is provided with cooling water inlet and coolant outlet, the top of described condenser pipe is provided with the condensing water vapor overflow vent, the bottom of described digestion tube is a heating part, the middle part of the bottom tube wall of described digestion tube is inwardly recessed, forms a groove, dress temperature sensor in the groove, the tube wall outside, bottom of digestion tube is enclosed with heating plate, and described heating plate outside is wrapped with muff; Clear up the bottom of reaction unit and shrink the formation liquid outlet, join by second pinch valve and second drain pipe; The outside of described muff is provided with fan.

The utility model adopts metering relatively, promptly by a part metering, by the different ratio umber of sample introduction reagent is set, reach the purpose of metering, and the advanced in the world liquid transfer mode-pneumatic transfer of employing, it is low to have noise, advantages such as volume is little, and maintenance period is long are shortened working hours greatly, and overcome the dead volume in the gauge line, improved work efficiency, cleared up reaction unit and adopt the heating plate heating, chilled water circulation cooling and fan-cooled mode, adopt the technology of not exclusively clearing up, shortened digestion time, improved the work efficiency of device, the quick dispelling pneumatic metering sample feeding reaction unit metering good reproducibility of COD of the present utility model, error in dipping is little, the precision height.

Description of drawings

Fig. 1 is the structural representation of the quick dispelling pneumatic metering sample feeding reaction unit of COD of the present utility model.

Fig. 2 is the side-looking structural representation of the measuring container of Fig. 1.

Description of reference numerals

1. measuring container 2. noncontinuous electrode silks 3. long electrode silks 4. air pump 5. first pinch valves

6. first drain pipe, 7. injection ports, 8. overflow vents, 9. digestion tubes, 10. fans

11. sampling pipe 12. condenser pipes 13. cooling jackets 14. cooling water inlets 15. coolant outlets

16. condensing water vapor overflow vent 17. grooves 18. temperature sensors 19. heating plates 20. muffs

21. liquid outlet 22. second pinch valves 23. second drain pipes

Embodiment

Below in conjunction with drawings and Examples structure of the present utility model and behaviour in service are further described.

The quick dispelling pneumatic metering sample feeding reaction unit of COD of the present utility model as depicted in figs. 1 and 2, comprise that top measuring apparatus and bottom clear up reaction unit, measuring apparatus comprises two wire electrodes of installing in measuring container 1 and the measuring container, one is that 2, one of noncontinuous electrode silks are long relatively slightly wire electrodes 3.The upper opening of measuring container 1 links to each other with an air pump 4, the bottom of measuring container 1 is connected with first drain pipe 6 by first pinch valve 5, have injection port 7 on the measuring container 1, injection port can have a plurality of, links to each other with peristaltic pump or other devices with carrier fluid function respectively.The noncontinuous electrode silk 2 that the measuring container front portion is provided with in 8, two wire electrodes of overflow vent is mutually neat with the lower edge of overflow vent 8.The wire electrode purpose that one is long and the other is short is the sample size for detectable.Reagent enters measuring container, at first contact the long electrode silk, then along with the prolongation of time, liquid level raises gradually, touch the noncontinuous electrode silk, such two wire electrode conductings can send the controller electric signal to, and controller sends the signal interruption peristaltic pump or other devices with carrier fluid function get sample again then.Clear up reaction unit and comprise digestion tube 9 and external fan 10, first drain pipe 6 extends down into digestion tube 9 inside, form the sample introduction pipe 11 in the digestion tube, digestion tube top is condenser pipe 12, its outside is surrounded by cooling jacket 13, cooling jacket 13 is provided with cooling water inlet 14 and coolant outlet 15, the top of condenser pipe 12 is provided with condensing water vapor overflow vent 16, the bottom of digestion tube 9 is a heating part, its middle part is provided with a groove 17, temperature sensor 18 is housed in the groove, and the outer wall of the bottom of digestion tube is enclosed with heating plate 19, and the heating plate outside is wrapped with muff 20; The bottom of clearing up reaction unit is a liquid outlet 21, joins 23 by second pinch valve 22 and second drain pipe; The outside of muff is provided with fan 10, clear up finish after, be used for to the cooling of the heating part of digestion tube.

In this example, muff 20 is silica gel muffs, the cooling water inlet be positioned at coolant outlet below.

In this example, injection port 7 has 4, is respectively injection port 7.1,7.2,7.3,7.4, is arranged on the top of measuring container 1 symmetrically.

Principle of work of the present utility model is:

At first four injection ports with measuring container link to each other with peristaltic pump or other devices with carrier fluid function, and apply certain voltage for two wire electrodes, and two short-and-medium wire electrodes of wire electrode are mutually neat with the lower edge of overflow vent.When starting working, at first close first pinch valve and second pinch valve, lentamente squeeze in measuring container by injection port reagent or water sample, treat the moment that the liquid level in the measuring container is all flooded two wire electrodes, wire electrode can produce certain current signal, after controller is sensed this current signal, automatic cut-out peristaltic pump or other have the power supply of the device of carrier fluid function, open first pinch valve and air pump then, excess liquid also can be discharged measuring container by overflow vent, be blown into the sample introduction pipe of clearing up reaction unit by reagent in the positive pressure handle measuring container or water sample, overcome dead volume fully, improved the confidence level of metering, so far a reagent sample introduction finishes; Other reagent are according to identical step, sample introduction successively, and be blown into the sample introduction pipe of clearing up reaction unit successively, reach the purpose of metering.

After each reagent of waiting to participate in to clear up reaction all enters and clears up reaction unit, impose on the heating plate certain voltage of digestion tube bottom, heating plate can be rapidly heated, temperature sensor is induction heating temperature at any time, and when treating that temperature sensor reaches set temperature value, heating plate quits work, when being lower than design temperature, heating plate works on, and to keep the digestion condition that sets, set digestion condition can reach 200 ℃.In digestion process, liquid can seethe with excitement along with the rising of temperature, this moment, condensation portion was started working, chilled water enters from the cooling water inlet, flows out from coolant outlet, circulates, constantly the chilled water that flows makes the steam cooling liquid in the condenser pipe, thereby the air pressure of the inside is controlled in certain scope, and the pressure when having avoided heating in the digestion tube constantly rises, and causes the danger of digestion tube blast.Clear up finish after, temperature is very high in the digestion tube, this moment, outside fan was started working, and chilled water constantly circulates, fluid temperature just can be reduced to room temperature within five minutes.Open second pinch valve and air pump at last, digestion solution is blown into colorimetric device.Through overtesting, when using digestion time of the present utility model to be 20 minutes, reached equal oxidation effectiveness in two hours with the standard law reaction, the result of result who measures and standard law (GB-11914-89) is very close, thereby can measure the COD value of sewage accurately.

Above-mentionedly only several specific embodiments in the utility model are illustrated; but can not be as protection domain of the present utility model; every equivalence of having done according to the design spirit in the utility model changes or modifies, and all should think to fall into protection domain of the present utility model.

Claims

1.COD quick dispelling pneumatic metering sample feeding reaction unit, comprise measuring apparatus and clear up reaction unit, it is characterized in that: described measuring apparatus comprises that one is long and the other is short in measuring container and the measuring container two wire electrodes, the top of described measuring container links to each other with an air pump, the bottom of described measuring container is connected with first drain pipe by first pinch valve, have injection port on the described measuring container, described measuring container front portion is provided with overflow vent, and short wire electrode is mutually neat with the lower edge of overflow vent; The described reaction unit of clearing up comprises digestion tube and external fan, first drain pipe extends down into described digestion tube inside, form the sample introduction pipe, the top of described digestion tube is condenser pipe, its outside is surrounded by cooling jacket, described cooling jacket is provided with cooling water inlet and coolant outlet, the top of described condenser pipe is provided with the condensing water vapor overflow vent, the bottom of described digestion tube is a heating part, the middle part of the bottom tube wall of described digestion tube is inwardly recessed, forms a groove, dress temperature sensor in the groove, the tube wall outside, bottom of digestion tube is enclosed with heating plate, and described heating plate outside is wrapped with muff; Clear up the bottom of reaction unit and shrink the formation liquid outlet, join by second pinch valve and second drain pipe; The outside of described muff is provided with fan.

2. the quick dispelling pneumatic metering sample feeding reaction unit of COD according to claim 1 is characterized in that: described cooling water inlet be positioned at described coolant outlet below.

3. the quick dispelling pneumatic metering sample feeding reaction unit of COD according to claim 1 and 2, it is characterized in that: described muff is the silica gel muff.

4. the quick dispelling pneumatic metering sample feeding reaction unit of COD according to claim 3, it is characterized in that: described injection port has a plurality of.

5. the quick dispelling pneumatic metering sample feeding reaction unit of COD according to claim 4, it is characterized in that: described injection port has 4, is arranged on the top of measuring container symmetrically.