CN106483308B - The buffer queue logic control method of COD testing processes - Google Patents
The buffer queue logic control method of COD testing processes Download PDFInfo
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Abstract
The present invention provides a kind of buffer queue logic control methods of COD testing processes, including：Step 1：Judge to drain whether the status information that buffer queue records recently is hull-borne information；If the judging result of step 1 is true, 3 are entered step：Step 3：Judge whether draining buffering testing result is true；If the judging result of step 3 is yes, 4 are entered step；Step 4：Whether discriminatory analysis interval testing result is true；If the judging result of step 4 is yes, 5 are entered step；Step 5：It sends and starts measuring command to COD detection devices, and record the sending time for starting measuring command.How rationally the present invention solves effectively to carry out logic control to the measurement process of COD, is measured to which on the one hand reduction is invalid, saves precious reagent, on the other hand increase the number of effective measured value to improve the measurement efficiency to polluted source.
Description
Technical field
The present invention relates to COD (COD) detections specifically to relate to the buffer queue logic control of COD testing processes
Method.This method can be widely applied for the logic control of COD equipment when the discharge of polluted source non-standing.
Background technology
COD (COD) reflects the contents level of oxygen consumption organic pollution in water sample, is the organic dirt of water body oxygen consumption
Contaminate the important monitoring project in object monitoring.Processing for sewage, China's regulation potassium dichromate method, the value measured claim
For COD.I.e. under conditions of strong acid and heating, the amount of consumed oxidant when with excessive potassium bichromate processing water sample,
It is indicated with oxygen (mg/L).COD is measured using potassium dichromate method, easy to operate, measurement result reproducibility is preferable.It is wanted according to country
It asks, website COD obtains an assay value for every 2 hours, daily no less than 6 effective assay values.With the use of equipment, it is fixed to need
When equipment is safeguarded and adds reagent.Potassium dichromate method measurement COD reagent dosages are more, and mercuric sulfate, potassium bichromate, sulphur
The reagents such as acid are toxic, need the recovery processing of profession, expensive, so needing to control using scientific and reasonable logical method
COD equipment carries out sampling analysis to increase effective analysis rate, and prevents the waste of reagent.
The whole flow process of COD sampling analyses lasts about 50 minutes, and the single website COD of national requirements obtains one in every 2 hours
A assay value, so terminating to equipment this period of analysis beginning next time to be waited in COD sampling analyses, then
To next time, the time point device of analysis can enter operating status again.By sewage sampling system to sewage discharge source when equipment is run
It is sampled and is sent into COD equipment and analyzed, obtained a result (as shown in Figure 1).Its analytic process be divided into as the preparation stage and
Analysis phase.Preparation stage groundwork is cleaning equipment internal duct and addition reagent；Analysis phase groundwork is heating
With analysis sewage sample, measurement result is obtained.
COD sampling systems are generally made of sampling conduit, sampling pump, sampling valve etc..Sampling conduit regards actual sewage and arranges mouth
Situation is generally 10-25 meters long.According to actual sampling pump power, sampling length of tube, whether there is or not height falls situations such as, discharge outlet
Pipeline or open tunnel type can be chosen.Sewage enters sampling system from discharge outlet, and by sampling system water acquisition to COD equipment, there are 1-5 points
The delay of clock.During this period of time, the water in sampling pipe is the sewage of last discharge.
The operating mechanism of COD measuring apparatus includes that external trigger analysis and Fixed Time Interval analyze two kinds.The prior art
Two kinds of logic control methods are used according to the characteristic of COD equipment operating mechanisms：Two kinds of self-action and trigger-type.
About conventional method one：Self-action logic control method.
This method is that COD equipment is automatically analyzed time interval to be set as 2 hours, every two hours carries out primary sampling point
Analysis, if there is sewage discharge at that time, equipment normal operation analysis process is obtained a result.If sewage stops arranging at that time, at that time
Equipment makes a turn, and is analyzed without measuring, and waits for measured next time again within 2 hours.Its logic control flow is as shown in Figure 2.
For the above control method, such as practical source of sewage sewage effluent situation it is as shown in Figure 3 (shadow representation normal discharge,
Blank indicates to stop discharging, and the graphical representation of lower section band filling triangle every two hours analyzes acquired results) the case where, analysis is such as
Under：
Fig. 3 indicates sewage discharge situation of certain website in 24 hours, carries out 12 water sample analysis, intermediate frequency in one day altogether
It is numerous stop/arrange switching during 3 analysis water-likes due to the characteristic that sampling system water acquisition be delayed cause analysis water-like for last time discharge
Sewage, for analysis result there are deviation (grid fill with triangle indicate), analysis result is invalid.There is no arrange when 5 analyses
Sewage is put, equipment makes a turn (expression of white triangles shape), do not go out analysis result.Authentic and valid sampling analysis result is (black in one day
Color triangle indicates) only have 4 times, and not up to national requirements at least 6 times requirements on the one, therefore the control method exists centainly
The problem of.
About conventional method two：Trigger-type logic control method (outside control)
This method mainly controls sewage sampling system according to flow instrument to the real-time measurements of the flow of sewage
ON/OFF simultaneously reaches the operation of the control to sampling analysis process flow operation/stopping by sending a command to COD equipment.Its logic flow
Journey is as follows：When source of sewage stops discharging, and the monitor value of system monitoring to flow instrument is less than the limit value being arranged, it is by sewage sampling
System is closed, and sends halt instruction to COD equipment.COD equipment is immediately finished sampling analysis flow and enters wait state at this time；
When source of sewage starts to discharge, the monitor value of flow instrument reaches the threshold values of setting, opens sewage sampling system, first sets COD equipment
It is set to 2 hours automatic measurement states, then detection device state, if equipment is waited for, transmission immediately begins to measure
Instruction is to equipment end, and control device immediately begins to analysis and measures, into operating status.Sewage enters COD by sampling system and sets
It is standby to carry out sampling analysis operation, after obtain a result.If equipment is in analysis, then any operation, waiting facilities point are not made
Analysis terminates to return to wait state.Trigger-type logic control method detail flowchart is as shown in Figure 4.
For above method, such as practical source of sewage sewage effluent situation (shadow representation normal discharge, blank as shown in Figure 5
Indicate to stop discharge, the graphical representation that lower section band fills triangle analyzes acquired results) the case where, it is analyzed as follows：
Fig. 5 indicates sewage discharge situation of certain website in 24 hours, has carried out 14 water sample analysis in one day altogether, wherein
Due to frequently stopping/arranging switching (being indicated with white triangles shape in figure), water discharge time led to COD equipment less than 50 minutes for 5 analyses
It receives and ceases and desist order in the operating analysis stage, analysis stops immediately, cannot obtain analysis result, waste a large amount of reagents.3 analyses
Water sample is since the characteristic that sampling system water acquisition is delayed causes analysis water-like to be the sewage of last time discharge, and there are deviations for analysis result
(grid is filled triangle and indicated), analysis result is invalid.Authentic and valid sampling analysis result only has 6 (black triangles
Indicate), only just reach national requirements at least 6 times requirements on the one.
Through retrieval, following Patents documents are found.
Coordinate indexing result 1：
Application number：2014102669405
Title：Numerical control dosing metering pump and metering method for COD detections
A kind of numerical control dosing metering pump and metering method for COD detections of the disclosure of the invention, including what is be horizontally arranged are led
Liquid pipe, catheter left end is combined closely with liquid storage tank to be connected, and catheter right end reaches in collecting tank, there are three solenoid valve be located at lead
It arranges between liquid pipe and three relays and from left to right, each solenoid valve connects a relay
Technical essential compares：The present invention retouches art content and belongs to different links in COD testing processes from the patent document.
Coordinate indexing result 2：
Application number：2012103472518
Title：A kind of fast sample metering resolution reaction unit for COD detections
A kind of fast sample metering resolution reaction unit detected for COD in water sample of the disclosure of the invention, sample introduction air pump connect
Sample cell top is connect, the connection of sample cell bottom is located at the top of the backflow pool below sample cell, and both sides are equipped with logical at the top of backflow pool
Wind pipeline and capstan, breather valve is arranged on ventilation shaft, and backflow pool passes through capstan and connects backflow gas pump, capstan
Upper setting reflux air pump valve, backflow pool bottom are connected by return duct above sample cell, and return valve, backflow pool is arranged on return duct
Measuring hoper is set in inner cavity, and the lower end of measuring hoper is stretched out outside backflow pool and connection resolution reaction bulb, and measuring hoper lower end is set
There is metering valve, metering valve is closed when being measured to the reagent in sample cell, and breather valve is closed when backflow gas pump work；Clear up reaction bulb
One corral of outside have electric heating piece；It clears up and semiconductor cooler is set above reaction bulb；Used in from extraction water sample to addition resolution
Oxidant and catalyst and resolution heating etc. fully achieve Automatic Control.
Technical essential compares：The patent document describes traditional control method, and the present invention describes to pass through innovation
Optimization of the control method to traditional control method.
Invention content
For the defects in the prior art, the object of the present invention is to provide a kind of buffer queue logics of COD testing processes
Control method.
According to a kind of buffer queue logic control method of COD testing processes provided by the invention, include the following steps：
Step 1：Judge to drain whether the status information that buffer queue records recently is hull-borne information；
If the judging result of step 1 is no, 2 are entered step；If the judging result of step 1 is true, 3 are entered step：
Step 2：After waiting for prefixed time interval, 1 is entered step：
Step 3：Judge whether draining buffering testing result is true；
If the judging result of step 3 is no, 2 are entered step；If the judging result of step 3 is yes, 4 are entered step；
Step 4：Whether discriminatory analysis interval testing result is true；
If the judging result of step 4 is no, 2 are entered step；If the judging result of step 4 is yes, 5 are entered step；
Step 5：It sends and starts measuring command to COD detection devices, and record the sending time for starting measuring command.
Preferably, the draining buffer queue, for store source of sewage cut off the water information and draining information.
Preferably, the draining buffer queue, specially：
When source of sewage is switched to hull-borne from state of cutting off the water, when starting draining of draining buffer queue record source of sewage
Between and hull-borne information；
When source of sewage is switched to from hull-borne cuts off the water state, draining buffer queue record source of sewage water stopping time and
Cut off the water status information.
Preferably, the draining buffering detection is the detection under source of sewage hull-borne；
If the time interval of current time and the last queue storage state of the draining buffer queue is more than to set
Fixed buffer time threshold values Buffer Time, then the testing result for draining buffering detection is true；Otherwise, then buffering detection is drained
Testing result be false.
Preferably, analysis interval detection is to measure to detect with the interval of current time for the last analysis；
If between current time and the last measurement of the time interval for starting measuring command sending time more than setting
Every threshold values AnaInterval, then the testing result for analyzing interval detection is true；Otherwise, then the testing result of interval detection is analyzed
It is false.
Compared with prior art, the present invention has following advantageous effect：
1, how rationally the present invention solves effectively to carry out logic control to the measurement process of COD, on the one hand subtract
Few invalid measurement, saves precious reagent, on the other hand increases the number of effective measured value to improve the measurement to polluted source
Efficiency.
2, advantage of the invention is that it is intensive switching stop/hull-borne when, because water sample exception and delay, in hull-borne
When duration not up to buffers threshold values, any analysis operation does not occur, reduces invalid analysis times, reaches saving reagent, prolongs
The purpose of long equipment life.Wherein buffering threshold values can be according to spot sampling environment, sampling length of tube, topography drop and sampling pump work
The practical factors such as rate adjust, and sampling interval threshold values can also be configured adjustment according to actual conditions.Only meet stable state
Water sample can just trigger " starting to analyze " order, the case where not occurring in analytic process by force termination, it is all analysis all
Can obtain it is authentic and valid as a result, just with the identification of system, statistics and application.
3, the present invention can be used in the automatic monitoring point of sewage (COD) for meeting national regulation.Meet national regulation
The automatic monitoring point of sewage, include at least COD automatic analysis equipments and data and acquire conveyor apparatus, the present invention controls shape with software
State, installation with on-site data gathering conveyor apparatus in, and directly be attached and control with COD automatic analysis equipments progress reality
It is existing.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is that sewage samples flow.
Fig. 2 is self-action logic control flow process figure.
Fig. 3 is one day internal drainage analysis chart of certain website under self-action logic control.
Fig. 4 is trigger-type logic control flow process figure.
Fig. 5 is one day internal drainage analysis chart of certain website under trigger-type logic control.
Fig. 6 is that sampling system status information buffers flow.
Fig. 7 is buffer queue analysis process.
Fig. 8 is the analysis result for the first drainage situation.
Fig. 9 is the analysis result for second of drainage situation.
Specific implementation mode
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
By the way that the characteristics of COD measurement process and pollution sources intermittent discharge is analyzed and studied, add in sampling flow
Enter buffer queue and two condition monitorings：The interval detection of draining buffering detection and analysis.
The buffer queue of draining for store source of sewage stop/drain information.During system operation, when source of sewage is from cutting off the water
When state is switched to hull-borne, system record starts time and the hull-borne information deposit draining buffer queue of draining.When
Source of sewage is switched to from hull-borne when cutting off the water state, and system equally records the time cut off the water and cut off the water status information and the row of deposit
Water buffer queue.
Draining buffering detection is the detection under source of sewage hull-borne, if present system time and the last queue
The time interval of storage state (one is set to hull-borne) be more than default Buffer Time (buffer time threshold values is general
Be set as 5 minutes) when testing result be true, if it is less than equal to Buffer Time, then testing result is false.
The detection of analysis interval is to measure to detect with the interval of current time for the last analysis.If when current system
Between (Now) (LastAnaTime, system is remembered after sending " starting to measure " order every time with the last measuring command sending time
Time when recording and storing transmission) time interval be more than default AnaInterval (threshold values of measurement interval, according to
National regulation is traditionally arranged to be 120 minutes), then testing result is true, if it is less than equal to AnaInterval, then testing result
It is false.
COD equipment operational processes be it is nearest in detection queue per minute stop/hull-borne, if it is cutting off the water, state is then returned
Wait state is returned, draining buffering detection is then carried out if it is hull-borne, if result is if false, return to waiting for state, if knot
Fruit if testing result is false carrying out the detection of analysis interval if true, still return to waiting for state, if it is true, to setting
Preparation send " starting to measure " to order, and record sends the time of order in systems, finally returns to wait state.
It is analyzed with the practical drainage situation that both above conventional method is illustrated, it is obtaining the result is that the first draining shape
Under state, this method has carried out 8 analyses and has measured altogether, contains 8 effective measurement results.Than 4 effectively surveys of the first conventional method
Amount result has more one times, and reduces reagent needed for 4 analysis process processes and consume.Second of state has carried out 10 altogether
Secondary analysis measures, and is effectively measured containing 10 times.4 are had more for 6 times effectively as a result, and reducing 4 times than second of conventional method
Reagent needed for analysis process process consumes.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or change within the scope of the claims, this not shadow
Ring the substantive content of the present invention.In the absence of conflict, the feature in embodiments herein and embodiment can arbitrary phase
Mutually combination.
Claims (1)
1. a kind of buffer queue logic control method of COD testing processes, which is characterized in that include the following steps：
Step 1：Judge to drain whether the status information that buffer queue records recently is hull-borne information；
If the judging result of step 1 is no, 2 are entered step；If the judging result of step 1 is true, 3 are entered step：
Step 2：After waiting for prefixed time interval, 1 is entered step：
Step 3：Judge whether draining buffering testing result is true；
If the judging result of step 3 is no, 2 are entered step；If the judging result of step 3 is yes, 4 are entered step；
Step 4：Whether discriminatory analysis interval testing result is true；
If the judging result of step 4 is no, 2 are entered step；If the judging result of step 4 is yes, 5 are entered step；
Step 5：It sends and starts measuring command to COD detection devices, and record the sending time for starting measuring command；
The draining buffer queue, for store source of sewage cut off the water information and draining information；
The draining buffer queue, specially：
When source of sewage is switched to hull-borne from state of cutting off the water, draining buffer queue record source of sewage beginning water discharge time and
Hull-borne information；
When source of sewage is switched to from hull-borne cuts off the water state, draining buffer queue records the water stopping time of source of sewage and cuts off the water
Status information；
The draining buffering detection is the detection under source of sewage hull-borne；
If the time interval of current time and the last queue storage state of the draining buffer queue is more than setting
Buffer time threshold values, then the testing result for draining buffering detection is true；Otherwise, then the testing result for draining buffering detection is false；
Analysis interval detection is to measure to detect with the interval of current time for the last analysis；
If current time and the measurement interval valve that the last time interval for starting measuring command sending time is more than setting
Value, then the testing result for analyzing interval detection is true；Otherwise, then the testing result for analyzing interval detection is false.
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| CN101302042A (en) * | 2008-04-21 | 2008-11-12 | 东南大学 | Intellectualized monitoring method for industrial park waste water discharge pollutant |
| CN101329252A (en) * | 2007-06-18 | 2008-12-24 | 北京安控科技股份有限公司 | Method for detecting chemical oxygen demand |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6415659B1 (en) * | 2000-09-13 | 2002-07-09 | Qed Environmental Systems, Inc. | Method for analyzing purge water |
| CN101021543A (en) * | 2007-03-13 | 2007-08-22 | 上海市环境监测中心 | Water polletion source on-line dynamic tracking monitoring method and system |
| CN101329252A (en) * | 2007-06-18 | 2008-12-24 | 北京安控科技股份有限公司 | Method for detecting chemical oxygen demand |
| CN101261145A (en) * | 2008-04-21 | 2008-09-10 | 东南大学 | Water pollutant discharging gross amount intelligentized measurement method |
| CN101302042A (en) * | 2008-04-21 | 2008-11-12 | 东南大学 | Intellectualized monitoring method for industrial park waste water discharge pollutant |
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