CN105004761A - Denitration system escaping ammonia on-line continuous monitoring device and method - Google Patents
Denitration system escaping ammonia on-line continuous monitoring device and method Download PDFInfo
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Abstract
The invention relates to a denitration system escaping ammonia on-line continuous monitoring device and a method. Currently, no denitration system escaping ammonia on-line continuous monitoring device or method characterized by accurate and reliable test result and timely result feedback exists. The device is characterized in that: it includes a filter, a sampling gun, a heat tracing pipe, an absorption bottle group, an air extraction pump, a sample pool, an ammonium ion electrode, a pH meter and a flushing water system. The absorption bottle group includes two groups of absorption bottles in parallel connection, the filter is mounted on the sampling gun, the heat tracing pipe is connected to the sampling gun and is connected to the two groups of absorption bottles, the absorption bottle group is connected to the air extraction pump, and the two groups of absorption bottles are connected to the sample pool. The method provided by the invention is characterized in that: when one group of absorption bottles finish absorption, a sample solution can be obtained, switching is carried out to the other group of absorption bottles to perform absorption so as to realize continuous work. The device and the method provided by the invention have the advantages of strong applicability, accurate and reliable test result, and timely result feedback.
Description
Technical field
The present invention relates to the device and method of a kind of denitrating system escape ammonia on-line continuous monitoring, belong to technical field of air pollution control.
Background technology
Along with the increasingly stringent of national environmental protection policy, most of in-service fired power generating unit and newly-built fired power generating unit are provided with equipment for denitrifying flue gas, ensure boiler smoke qualified discharge.The outer active service denitration outlet amount of ammonia slip of Present Domestic adopts on-line monitoring equipment to detect, detection technique great majority adopt laser absorption spectroscopy, but because smoke components is complicated, dust content is high, equipment Inspection laser head easily blocks or is blocked by floating dust, long-play will break down, cause detection data distortion, if publication date is on 07 23rd, 2014, publication number is in the Chinese patent of CN103940778A, disclose a kind of measuring system for flue gas escape ammonia, this measuring system comprises measurement mechanism and sampling apparatus, measurement mechanism comprises laser instrument, the installation pipeline section that aspiration pump and sampling apparatus described in exhaust tube are connected with measurement mechanism, the sampling pipeline section be connected with sampling head and be arranged on pipeline section is installed and sample between pipeline section with pipeline section is installed and the scalable sampling pipe that pipeline section is set with of sampling, often organize pipeline section diameter dimension to successively decrease, realize suit, what this measuring system adopted is exactly laser absorption spectroscopy.In addition, current domestic existing on-line monitoring instrument analysis principle mostly is electrochemical analysis principle and spectrophotometry, and this quasi-instrument under severe operating conditions test accuracy shows slightly not enough, and error is larger on test result impact.
Also there are now the other technologies for detecting denitrating system escape ammonia, if publication date is on 03 20th, 2013, publication number is in the Chinese patent of CN202814766U, disclose a kind of flue gas pre-service formula denitration system of power plant escape ammonia sampling analysis device, this sampling analysis device comprises sampling gun, sampling gun connects oxysulfide absorption plant, oxysulfide absorption plant is connected with filtration unit, filtration unit is connected with the drying device outside flue by connecting pipe, drying device is through volumetric displacement meter, aspiration pump communicates with absorption bottle, but this sampling analysis device is difficult to realize on-line continuous monitoring function.
In sum, also do not have a kind of structure simple at present, reasonable in design, applicability is strong, test result accurately and reliably, the device and method of result feedback denitrating system escape ammonia on-line continuous monitoring timely.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of reasonable in design, applicability is strong, test result accurately and reliably, the device and method of result feedback denitrating system escape ammonia on-line continuous monitoring timely.
The present invention's adopted technical scheme that solves the problem is: the feature of the device of this denitrating system escape ammonia on-line continuous monitoring is: comprise filtrator, sampling gun, a valve, trace pipe, absorption bottle group, flowmeter, aspiration pump, peristaltic pump, sample cell, ammonium ion electrode, pH meter, basifier storage tank, control module, digital display module, blowback compressed air tank, absorbing liquid storage tank, a standard flow container, No. two standard flow containers, blank flow container, wash-down water system, outer row's peristaltic pump, No. two valves, flowrate control valve, threeway, an absorption bottle air intake valve, No. two absorption bottle air intake valves and pH regulate peristaltic pump, described absorption bottle group comprises the two groups of absorption bottles be in parallel, described filtrator is arranged on sampling gun, described threeway is arranged on the end of sampling gun, one end of described threeway is connected on trace pipe by pipeline and a valve, the other end of this threeway is connected on blowback compressed air tank by pipeline and No. two valves, described trace pipe is connected on one group of absorption bottle by pipeline and an absorption bottle air intake valve, this trace pipe is connected on another group absorption bottle by pipeline and No. two absorption bottle air intake valves, and described absorption bottle group passes through pipeline, flowmeter and flowrate control valve are connected on aspiration pump, and described absorption bottle of often organizing all passes through pipeline, valve and peristaltic pump are connected on sample cell, described ammonium ion electrode and pH meter all coordinate with sample cell, this ammonium ion electrode is all connected with control module with pH meter, described control module is connected with digital display module, described basifier storage tank regulates peristaltic pump to be connected on sample cell by pipeline and pH, described wash-down water system by flushing line respectively with sample cell, ammonium ion electrode and pH meter coordinate, and described sample cell is connected with outer row's peristaltic pump by pipeline, described absorbing liquid storage tank, a standard flow container, No. two standard flow containers are all connected with absorption bottle group with blank flow container.
As preferably, filtrator of the present invention is arranged on the front end of sampling gun.
As preferably, the inwall gas passage of sampling gun of the present invention adopts the stainless-steel tube of polishing and high-temperature resistant nano coating or adopts the stainless-steel tube of embedded nano ceramics sleeve pipe.Make thus to prevent gas, adsorbing powder dust at inside pipe wall, cause gas sample to lose, be conducive to improving monitoring accuracy further.
As preferably, ammonium ion electrode of the present invention is ammonia gas-sensing electrode.
As preferably, the present invention often organizes absorption bottle and includes two absorption bottles, all respectively have an absorption bottle to be connected on sample cell by same peristaltic pump again by after independently valve in two groups of absorption bottles, in two groups of absorption bottles, another absorption bottle remaining is connected on sample cell by other same peristaltic pump by after independently valve again separately.
As preferably, ammonium ion electrode of the present invention and pH meter are installed in sample cell.
The present invention solves the problems of the technologies described above another adopted technical scheme: a kind of method of the device using denitrating system escape ammonia on-line continuous to monitor, and its feature is: the step of described method is as follows:
A, each instrument and equipment to be connected on request;
When b, sampling, sampling gun is stretched into flue from gaging hole, open trace pipe simultaneously, after companion's hot temperature degree meets the demands, start sampling; When run into need to use blowback compressed air tank to carry out blowback time, temporarily exit sampling operation;
One end of c, trace pipe is connected to the end of sampling gun, draws flue gas, and along Cheng Jiare, prevents flue gas condensing;
The other end of d, trace pipe is connected in absorption bottle group, quantitative absorbing liquid is loaded in absorption bottle in absorption bottle group, to guarantee the effective constituent absorbed completely in flue gas, soak time controls to be 5 ~ 15min according to gas flow, sample liquid is obtained after one group of absorption bottle has absorbed, and be switched to another group absorption bottle proceed absorb, continuous working;
Sample liquid in e, absorption bottle enters sample cell by sampling system, basifier in basifier storage tank is delivered in sample cell by medicine system, whether stop adding basifier according to pH meter displayed value logic feedback, after the pH value of sample liquid meets the demands, ammonium ion electrode is started working, test result feeds back to digital display module as electronic signals through control module, draws monitoring result, and carries out data storage;
F, the sample liquid tested are discharged by unwatering system, and rinse sample cell, ammonium ion electrode and pH meter by wash-down water system, and effluent discharge;
G, sampling and monitoring repeat step a ~ f.
As preferably, absorption plant of the present invention adopts two cover absorption bottles in parallel, be used alternatingly during sampling, the sampling time is determined by controlling sample gas volume, gas production flow realizes controlling by flowmeter and flowrate control valve, when carrying out meter calibration, absorbing liquid sample introduction switches to titer sample introduction, absorption bottle linking parsing device sampling system.
As preferably, add basifier in step e of the present invention by medicine system in sample cell, make the pH value of the sample solution in sample cell more than 11.0, pH meter is for feeding back the information the need of adding basifier.
As preferably, in step b of the present invention, during sampling, whole sampling gun stretches into flue from gaging hole.
The present invention compared with prior art, has the following advantages and effect: 1, can solve online escape ammonia monitoring problem as a kind of general method, and applicability is strong, has promotional value; 2, the simple structure of device, technology maturation, cost is low, easy to operate, unit assembled window; 3, on-line continuous monitoring, in real time, efficiency is high, and accurately and reliably, result feedback is timely for test result in monitoring; 4, reasonable in design, simple to operate, design is unique.
The device of the denitrating system escape ammonia on-line continuous monitoring in the present invention can comprise sampling gun part, trace pipe part, absorption plant, analytical equipment, pipe system, data output and printing portion, control system.Sampling gun part can comprise filtrator, sampling pipe, the hot device of companion, threeway, compressed air tank, connecting pipe etc., there is Chalk-dust filtering, gas companion heat and gas blowing function, dust-filtering effect and heating-up temperature meet relevant criterion requirement, and blow-back function meets filtrator deashing function.Trace pipe part can be a kind of conventional test heating device, can extend, and for maintaining gas temperature, prevents condensation of gas.Absorption plant can comprise two cover secondary absorption bottles, absorbing liquid/titer sampling system, aspiration pump, flowmeter, wash-down water system etc. in parallel, is a kind of specially for the absorption plant of object gas.Analytical equipment can comprise sampling system, sample cell, ion electrode, medicine system, pH meter, wash-down water system, unwatering system etc.Pipe system can comprise connecting tube, peristaltic pump, threeway, valve etc.Data export and printing device part can comprise standard database, calculate converting system, display, data-carrier store, printer etc.Control system can comprise logic feedback, Data Control, Based Intelligent Control etc.Absorption plant adopts two cover secondary absorption bottles in parallel, be used alternatingly during sampling, the sampling time is determined by controlling sample gas volume, gas production flow is realized by flowmeter and flowrate control valve, the parameter such as absorbing liquid consumption, sampling flow, sampling time can carry out particular design, when carrying out meter calibration, absorbing liquid sample introduction switches to titer sample introduction, absorption bottle linking parsing device sampling system.Sampling system can adopt peristaltic pump by sample delivery to sample cell; Ammonium ion electrode can refer to ammonia gas-sensing electrode or relevant ions electrode; Medicine system is pointed in sample cell and is added basifier, and make the pH value of sample solution more than 11.0, pH meter is for feeding back the information the need of adding basifier; The accuracy and precision of analytical equipment analysis result can meet relevant criterion requirement; Pipe system is mainly used in pipeline and connects, and can be all common industrial articles for use; Data export and printing device part, control system all realize by routine techniques means.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of denitrating system escape ammonia on-line continuous monitoring in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1, in the present embodiment, the device of denitrating system escape ammonia on-line continuous monitoring comprises filtrator 1, sampling gun 2, a valve 3, trace pipe 4, absorption bottle group 5, flowmeter 6, aspiration pump 7, peristaltic pump 8, sample cell 9, ammonium ion electrode 10, pH meter 11, basifier storage tank 12, control module 13, digital display module 14, blowback compressed air tank 15, absorbing liquid storage tank 16, a standard flow container 17, No. two standard flow containers 18, blank flow container 19, wash-down water system 20, outer row's peristaltic pump 21, No. two valves 22, flowrate control valve 23, threeway 24, an absorption bottle air intake valve 25, No. two absorption bottle air intake valves 26 and pH regulate peristaltic pump 27.
Absorption bottle group 5 in the present embodiment comprises the two groups of absorption bottles be in parallel, filtrator 1 is arranged on sampling gun 2, threeway 24 is arranged on the end of sampling gun 2, one end of threeway 24 is connected on trace pipe 4 by pipeline and a valve 3, the other end of this threeway 24 is connected on blowback compressed air tank 15 by pipeline and No. two valves 22, trace pipe 4 is connected on one group of absorption bottle by pipeline and an absorption bottle air intake valve 25, and this trace pipe 4 is connected on another group absorption bottle by pipeline and No. two absorption bottle air intake valves 26.
Absorption bottle group 5 in the present embodiment is connected on aspiration pump 7 by pipeline, flowmeter 6 and flowrate control valve 23, often organizing absorption bottle is all connected on sample cell 9 by pipeline, valve and peristaltic pump 8, ammonium ion electrode 10 and pH meter 11 all coordinate with sample cell 9, this ammonium ion electrode 10 is all connected with control module 13 with pH meter 11, and control module 13 is connected with digital display module 14.
Basifier storage tank 12 in the present embodiment regulates peristaltic pump 27 to be connected on sample cell 9 by pipeline and pH, wash-down water system 20 is coordinated with sample cell 9, ammonium ion electrode 10 and pH meter 11 respectively by flushing line, sample cell 9 is connected with outer row's peristaltic pump 21 by pipeline, and absorbing liquid storage tank 16, standard flow container 17, No. two standard flow containers 18 are all connected with absorption bottle group 5 with blank flow container 19.
Under normal circumstances, filtrator 1 is arranged on the front end of sampling gun 2; The inwall gas passage of sampling gun 2 adopts the stainless-steel tube of polishing and high-temperature resistant nano coating or adopts the stainless-steel tube of embedded nano ceramics sleeve pipe; Ammonium ion electrode 10 is ammonia gas-sensing electrode; Often organize absorption bottle and include two absorption bottles, all respectively have an absorption bottle to be connected on sample cell 9 by same peristaltic pump 8 again by after independently valve in two groups of absorption bottles, in two groups of absorption bottles, another absorption bottle remaining is connected on sample cell 9 by other same peristaltic pump 8 by after independently valve more separately; Ammonium ion electrode 10 and pH meter 11 are installed in sample cell 9.
In the present embodiment, the step of the method for denitrating system escape ammonia on-line continuous monitoring is as follows.
A, each instrument and equipment to be connected on request.
When b, sampling, sampling gun 2 is stretched into flue from gaging hole, open trace pipe 4 simultaneously, after companion's hot temperature degree meets the demands, start sampling; When run into need to use blowback compressed air tank 15 to carry out blowback time, temporarily exit sampling operation.
One end of c, trace pipe 4 is connected to the end of sampling gun 2, draws flue gas, and along Cheng Jiare, prevents flue gas condensing.
The other end of d, trace pipe 4 is connected in absorption bottle group 5, quantitative absorbing liquid is loaded in absorption bottle in absorption bottle group 5, to guarantee the effective constituent absorbed completely in flue gas, soak time controls to be 5 ~ 15min according to gas flow, sample liquid is obtained after one group of absorption bottle has absorbed, and be switched to another group absorption bottle proceed absorb, continuous working.
Sample liquid in e, absorption bottle enters sample cell 9 by sampling system, basifier in basifier storage tank 12 is delivered in sample cell 9 by medicine system, whether stop adding basifier according to pH meter 11 displayed value logic feedback, after the pH value of sample liquid meets the demands, ammonium ion electrode 10 is started working, test result feeds back to digital display module 14 as electronic signals through control module 13, draws monitoring result, and carries out data storage.
F, the sample liquid tested are discharged by unwatering system, and rinse with wash-down water system 20 pairs of sample cells 9, ammonium ion electrode 10 and pH meter 11, and effluent discharge.
G, sampling and monitoring repeat step a ~ f.
Under normal circumstances, absorption plant adopts two cover absorption bottles in parallel, be used alternatingly during sampling, the sampling time is determined by controlling sample gas volume, gas production flow realizes controlling by flowmeter 6 and flowrate control valve 23, when carrying out meter calibration, absorbing liquid sample introduction switches to titer sample introduction, absorption bottle linking parsing device sampling system; In sample cell 9, add basifier by medicine system in step e, make the pH value of the sample solution in sample cell 9 more than 11.0, pH meter 11 is for feeding back the information the need of adding basifier; In step b, during sampling, whole sampling gun 2 stretches into flue from gaging hole.
The device of the denitrating system escape ammonia on-line continuous monitoring in the present embodiment operationally, under the draft effect of aspiration pump 7, flue gas enters the sampling gun 2 of band companion heat through filtrator 1, sampling gun 2 end of band companion heat connects a threeway, two bursts of gas circuits control with a valve 3 and No. two valves 22 respectively, one tunnel connects trace pipe 4, another road connects blowback compressed air tank 15, flue gas introduces absorption bottle group 5 from No. one, one end valve 3 connecting trace pipe 4, after gas effective constituent is absorbed, continue along gas circuit through flowmeter 6 and flowrate control valve 23, emptying by aspiration pump 7, the sample liquid absorbed after gas effective constituent enters sample cell 9 along water route through peristaltic pump 8, pH meter 11 is measured the pH value of sample liquid and test result is converted to electric signal and feed back to control module 13, medicine system starts after receiving dosing signal to add basifier in sample cell 9, until the pH value of sample liquid is greater than 11, stop dosing, after solution has mixed, detect result by ammonium ion electrode 10, and carry out data-electric signal conversion, then by digital display module 14 Output rusults by control module 13, sample liquid after having detected is by the outer row of outer row's peristaltic pump 21 of unwatering system, and wash-down water system 20 pairs of ammonium ion electrodes 10, pH meter 11 and sample cell 9 etc. rinse, and flushing waste water is through the outer row of outer row's peristaltic pump 21.
Gas circuit valve closing after a set of secondary absorption bottle has absorbed, sampling gas circuit switches to another set of secondary absorption bottle and continues sampling; The sample liquid that a set of secondary absorption bottle produces is delivered to sample cell 9 by peristaltic pump 8, closes Water path valve immediately, add absorbing liquid by absorbing liquid storage tank 16 by peristaltic pump in emptying absorption bottle 5 after having carried; First timing signal wash-down water rinses absorption bottle, and waste water is arranged outside water route, and the flow process of demarcating liquid is identical with sample liquid flow process, and the present invention adopts 2 standardizations, namely adopts a standard flow container 17 and No. two standard flow containers 18; Blank flow container 19 flow process during blank assay is identical with sample liquid.
In addition, it should be noted that, the specific embodiment described in this instructions, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this instructions is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (10)
1. a device for denitrating system escape ammonia on-line continuous monitoring, is characterized in that: comprise filtrator, sampling gun, a valve, trace pipe, absorption bottle group, flowmeter, aspiration pump, peristaltic pump, sample cell, ammonium ion electrode, pH meter, basifier storage tank, control module, digital display module, blowback compressed air tank, absorbing liquid storage tank, a standard flow container, No. two standard flow containers, blank flow container, wash-down water system, outer row's peristaltic pump, No. two valves, flowrate control valve, threeway, an absorption bottle air intake valve, No. two absorption bottle air intake valves and pH regulate peristaltic pump, described absorption bottle group comprises the two groups of absorption bottles be in parallel, described filtrator is arranged on sampling gun, described threeway is arranged on the end of sampling gun, one end of described threeway is connected on trace pipe by pipeline and a valve, the other end of this threeway is connected on blowback compressed air tank by pipeline and No. two valves, described trace pipe is connected on one group of absorption bottle by pipeline and an absorption bottle air intake valve, this trace pipe is connected on another group absorption bottle by pipeline and No. two absorption bottle air intake valves, and described absorption bottle group passes through pipeline, flowmeter and flowrate control valve are connected on aspiration pump, and described absorption bottle of often organizing all passes through pipeline, valve and peristaltic pump are connected on sample cell, described ammonium ion electrode and pH meter all coordinate with sample cell, this ammonium ion electrode is all connected with control module with pH meter, described control module is connected with digital display module, described basifier storage tank regulates peristaltic pump to be connected on sample cell by pipeline and pH, described wash-down water system by flushing line respectively with sample cell, ammonium ion electrode and pH meter coordinate, and described sample cell is connected with outer row's peristaltic pump by pipeline, described absorbing liquid storage tank, a standard flow container, No. two standard flow containers are all connected with absorption bottle group with blank flow container.
2. the device of denitrating system escape ammonia on-line continuous monitoring according to claim 1, is characterized in that: described filtrator is arranged on the front end of sampling gun.
3. the device of denitrating system escape ammonia on-line continuous monitoring according to claim 1, is characterized in that: the inwall gas passage of described sampling gun adopts the stainless-steel tube of polishing and high-temperature resistant nano coating or adopts the stainless-steel tube of embedded nano ceramics sleeve pipe.
4. the device of denitrating system escape ammonia on-line continuous monitoring according to claim 1, is characterized in that: described ammonium ion electrode is ammonia gas-sensing electrode.
5. the device of denitrating system escape ammonia on-line continuous monitoring according to claim 1, it is characterized in that: often organize absorption bottle and include two absorption bottles, all respectively have an absorption bottle to be connected on sample cell by same peristaltic pump again by after independently valve in two groups of absorption bottles, in two groups of absorption bottles, another absorption bottle remaining is connected on sample cell by other same peristaltic pump by after independently valve again separately.
6. the device of denitrating system escape ammonia on-line continuous monitoring according to claim 1, is characterized in that: described ammonium ion electrode and pH meter are installed in sample cell.
7. a method for the device of the denitrating system escape ammonia on-line continuous monitoring as described in claim as arbitrary in claim 1-6, is characterized in that: the step of described method is as follows:
A, each instrument and equipment to be connected on request;
When b, sampling, sampling gun is stretched into flue from gaging hole, open trace pipe simultaneously, after companion's hot temperature degree meets the demands, start sampling; When run into need to use blowback compressed air tank to carry out blowback time, temporarily exit sampling operation;
One end of c, trace pipe is connected to the end of sampling gun, draws flue gas, and along Cheng Jiare, prevents flue gas condensing;
The other end of d, trace pipe is connected in absorption bottle group, quantitative absorbing liquid is loaded in absorption bottle in absorption bottle group, to guarantee the effective constituent absorbed completely in flue gas, soak time controls to be 5 ~ 15min according to gas flow, sample liquid is obtained after one group of absorption bottle has absorbed, and be switched to another group absorption bottle proceed absorb, continuous working;
Sample liquid in e, absorption bottle enters sample cell by sampling system, basifier in basifier storage tank is delivered in sample cell by medicine system, whether stop adding basifier according to pH meter displayed value logic feedback, after the pH value of sample liquid meets the demands, ammonium ion electrode is started working, test result feeds back to digital display module as electronic signals through control module, draws monitoring result, and carries out data storage;
F, the sample liquid tested are discharged by unwatering system, and rinse sample cell, ammonium ion electrode and pH meter by wash-down water system, and effluent discharge;
G, sampling and monitoring repeat step a ~ f.
8. the method for denitrating system escape ammonia on-line continuous monitoring according to claim 7, it is characterized in that: absorption plant adopts two cover absorption bottles in parallel, be used alternatingly during sampling, the sampling time is determined by controlling sample gas volume, gas production flow realizes controlling by flowmeter and flowrate control valve, when carrying out meter calibration, absorbing liquid sample introduction switches to titer sample introduction, absorption bottle linking parsing device sampling system.
9. the method for denitrating system escape ammonia on-line continuous monitoring according to claim 7, it is characterized in that: in described step e, in sample cell, add basifier by medicine system, make the pH value of the sample solution in sample cell more than 11.0, pH meter is for feeding back the information the need of adding basifier.
10. the method for denitrating system escape ammonia on-line continuous monitoring according to claim 7, it is characterized in that: in described step b, during sampling, whole sampling gun stretches into flue from gaging hole.
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