CN102818783A - Method and device for measuring ammonia escape amount in sintering flue gas ammonia-process desulfurization technique - Google Patents
Method and device for measuring ammonia escape amount in sintering flue gas ammonia-process desulfurization technique Download PDFInfo
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- CN102818783A CN102818783A CN2012103282528A CN201210328252A CN102818783A CN 102818783 A CN102818783 A CN 102818783A CN 2012103282528 A CN2012103282528 A CN 2012103282528A CN 201210328252 A CN201210328252 A CN 201210328252A CN 102818783 A CN102818783 A CN 102818783A
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Abstract
The invention discloses a method and device for measuring ammonia escape amount in a sintering flue gas ammonia-process desulfurization technique. The method comprises the following steps: pumping clean sample gas, which is subjected to dust removal by a filter unit, into a water-containing container by using a metering suction pump; by using the characteristic of high solubility of ammonia gas in water under given conditions, sufficiently contacting the gas with the liquid until the ammonia gas is completely dissolved in water; and measuring the total nitrogen content in the solution in the water-containing container, and subtracting the total nitrogen content in the barren water sample and the nitrate nitrogen content in flue gas dissolved in water from the total nitrogen content in the water solution, thereby obtaining the data of ammonia escape amount. The invention avoids mutual interference among different gases in the sintering flue gas, and enhances the accuracy of the measurement result; the invention avoids using heavy and complex gas detection instruments, and simplifies the detection process; and the device disclosed by the invention has the advantage of low investment cost, and is simple and quick to operate, easy to carry and convenient to maintain and use.
Description
Technical field
The present invention relates to the determination techniques of micro-ammonia in the mixed gas, refer to the assay method and the device thereof of escape ammonia content in a kind of sintering flue gas ammonia method desulfurizing technology particularly.
Background technology
For satisfying the requirement of sulphuric dioxide discharging standards; Flue gas desulfurization has become one of important step in the enterprise production process such as thermoelectricity and iron and steel; Wherein, Ammonia desulfurizing process is to be that desulfurizing agent removes sulfur in smoke and generates ammonium sulfite with certain density ammoniacal liquor, utilizes airborne oxygen that sulfite oxidation is become the ammonium sulfate secondary product again, reaches the purpose of gas cleaning.Ammoniacal liquor absorbs the SO in the flue gas
2Be gas liquid reaction, have that reaction velocity is fast, reaction thoroughly, the absorbing agent utilization factor is high, and can realize advantage such as high-efficiency desulfurization.
Ammonia desulfurizing process is because of meeting the recycling economy development requirement, and its desulfuration efficiency is high in addition, and has to start with characteristics such as quick, easy out of service and in numerous flue gas desulfurization techniques, take the course of its own.But the such problem of present domestic ammonia desulfuration equipment ubiquity: owing to absorb incomplete and fluctuation of service, carry a large amount of free ammonias when often causing fume emission secretly, ammonia amount how to measure these escapes becomes a difficult problem.According to read up the literature, measuring the escaping of ammonia method and apparatus is through aspiration pump ammonia to be transferred to being oxides of nitrogen for one type, promptly utilizes whole micro-ammonia and O in the flue gas to be measured
2Reaction conversion is NO
xAfter, get into NO again
xAnalyser measuring N O
xConcentration, data acquisition and analysis system is according to the O of input
2NO before and after concentration signal and the pre-service
xThe concentration signal of ammonia in the flue gas, this quasi-instrument complex equipments, and extra increase NO are changed and be output as to concentration signal
xReactor, catalyzer reach appendix systems such as firing equipment, and equipment is huge, carries inconvenience, and accuracy of measurement also has certain limitation; Another kind of assay method is with O in the flue gas
2, NO
x, CO
2, SO
2, and the sensing element of gas concentration such as ammonia integrates and measures, and this quasi-instrument costs an arm and a leg, and also there is the phase mutual interference in all gases together, and sour gas is to the sensor seriously corroded, and service life of equipment is limited.
Summary of the invention
The objective of the invention is provides a kind of simple, economical to the problem that prior art exists, and the assay method and the device thereof of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology accurately and effectively.
For realizing above-mentioned purpose, the assay method of amount of ammonia slip comprises the steps: in the sintering flue gas ammonia method desulfurizing technology that the present invention designed
1) sinter fume that discharges after the ammonia process of desulfurization is removed dust wherein with the conventional filtration means;
2) get blank water, measure the total nitrogen content in the blank water with conventional method;
3) will pass through the appearance gas metering that step 1) handles and charge into capacity step 2) in the said blank water, so that the ammonia in the appearance gas is all soluble in water;
4) take a sample the WS after handling through step 3); Measure the total nitrogen content and the nitrate nitrogen content of the WS respectively with conventional method, the total nitrogen content that deducts blank water again by the difference of the total nitrogen content of the WS and nitrate nitrogen content can obtain the data of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology.
For realizing the determinator of amount of ammonia slip in the custom-designed a kind of sintering flue gas ammonia method desulfurizing technology of said method, it comprises the water container of sealing, and water container is provided with gas outlet; Simultaneously; Water container links to each other with wireway, and the wireway end stretches in the water container, and wireway head end and the metering delivery side of pump of bleeding is connected; The input end of metering aspiration pump is connected with the end of draft tube, and the head end of draft tube is connected with filtration unit.
The end of said wireway is provided with gas distributor.Gas distributor is used to increase gas-liquid contact area and duration of contact, so that the ammonia in the flue gas can be soluble in water fully.
Be respectively equipped with valve on said wireway and the gas outlet.Convenience valve control air inlet and exhaust situation.
Principle of the present invention is to utilize the metering aspiration pump will pass through in the clean appearance gas suction water container of filtration unit dust removal process; Utilize big this characteristic of the solubleness of ammonia in water under the specified criteria; Gas-liquid is fully contacted, make ammonia soluble in water fully, then through surveying the total nitrogen of solution in the water container; Water-soluble nitrate nitrogen content in the total nitrogen that deducts the blank water of water sample with the total nitrogen of the WS and the flue gas, the gained data can be converted into the interior amount of ammonia slip of measurement unit.Wherein, the metering aspiration pump can accurately be measured the flow of flue gas, through suction function the flue gas in bleeding device or the chimney is drawn in the water container simultaneously; Total nitrogen in the WS and the blank water can adopt standard method to measure, as: alkaline alkaline potassium per-sulfate digestion ultraviolet spectrophotometry or gas-phase molecular absorption spectrometry method; The nitrate nitrogen of the WS can adopt gas-phase molecular absorption spectrometry method or determined by ultraviolet spectrophotometry.
Compared with prior art, the present invention has following advantage:
One of which, the inventive method have been avoided interference and the infringement of the dust in the sinter fume to routine measurement device probe or electrode, make the serviceable life of routine measurement device and accuracy of measurement all significantly improve.
Its two, the inventive method is utilized big this characteristic of ammonia solubleness in water, the gaseous state testing environment is converted in the WS measure, and has avoided the phase mutual interference between gas with various in the sinter fume, has improved the accuracy of measuring the result; Experimental result proves, under the normal temperature, utilizes the inventive method can accurately measure amount of ammonia slip in the waste gas, and error is within ± 5%.
Its three, the inventive method utilizes in the WS that available conventional method obtains the content data of total nitrogen and nitrate nitrogen to come the indirect determination amount of ammonia slip, has avoided the gas detecting instrument of bulky complex, simplifies and has come the mensuration process.
Its four, apparatus of the present invention drop into expense low, simple and quick, be easy to carry about with one, safeguard and easy to use.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of apparatus of the present invention.
Fig. 2 is the filter apparatus configuration synoptic diagram in apparatus of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is further described, but the present invention is not limited to following embodiment.
Like Fig. 1, shown in Figure 2, the determinator of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology, it comprises the water container 10 of sealing; Its top is provided with removable container cover, and container cover is provided with gas outlet 11, and gas outlet 11 is used for water-fast gas in the flue gas is discharged in water container 10; Simultaneously, water container 10 links to each other with wireway 8, and the end of wireway 8 passes container cover and stretches in the water container 10; And this end is provided with gas distributor 12, and the head end of wireway 8 is connected with the output terminal of metering aspiration pump 7, and the input end of metering aspiration pump 7 is connected with the end of draft tube 6; The head end of draft tube 6 is connected with filtration unit 1; Be provided with filter core 2 in the filtration unit 1, the main effect of filtration unit 1 is the filter core 2 that compresses in the pipe, and this filter core 2 can be 100 ~ 1000 microns porous filter paper or the macromolecule filter screen pad in aperture roughly the same; Its effect is to filter the dust in flue gas particle; The gas outlet of filtration unit 1 is connected with escape pipe 4 through integral joint 3, and this escape pipe 4 is connected through another integral joint 5 with draft tube 6, and draft tube 6 is band tubing with wireway 8.The escape pipe 4 preferred stainless steel materials of filtration unit 1, this is because this escape pipe 4 can be inserted into the flue gas admission passage of flue gas bleeding device or chimney with filtration unit 1, therefore, the escape pipe 4 of filtration unit 1 needs to select exotic material.Be respectively equipped with valve 9 on wireway 8 and the gas outlet 11.
The course of work of apparatus of the present invention is following: before the measurement; Remove ionized water as blank water; The total nitrogen of measuring blank water with alkaline alkaline potassium per-sulfate digestion ultraviolet spectrophotometry (HJ636-2012) is X3mg/L; Open the container cover of water container 10, pour the deionized water (is example with V=5L) of certain volume V in the water container 10 into, rapidly the valve 9 on wireway 8, the gas outlet 11 is closed; Filter core 2 is encased in the filtration unit 1 tightens; Stainless steel escape pipe 4 one ends are connected with filtration unit 1 through integral joint 3 and tighten, and the other end is connected through the head end of integral joint 5 with draft tube 6, and the end with draft tube 6 connects and check impermeability with metering aspiration pump 7 simultaneously; During measurement; Wireway 8 and the valve 9 on the gas outlet 11 are all opened; Simultaneously stainless steel escape pipe 4 is inserted in the exhaust gases passes of flue gas bleeding device or chimney, and opens the power switch 14 of metering aspiration pump 7, metering aspiration pump 7 sucks the flue gas negative pressure in the water container 10; Smoke absorption is gone into amount and generally is less than at the ammonia maxima solubility of giving under fixed temperature, the pressure; Because the gases soluble in water such as ammonia in the flue gas fully contact with water through gas distributor 12, can think that ammonia is absorbed fully, the gas that solubleness is little in water is overflowed from water container 10 through gas outlet 11; In preset time, write down the exhaust gas volumn Q (is example with Q=300L) that metering aspiration pump 7 sucks, close the power supply 13 of metering aspiration pump 7, extract escape pipe 4 out, and close the valve 9 on wireway 8 and the gas outlet 11; Take out two duplicate samples with ST for 10 li from water container; The total nitrogen of measuring a copy of it sample with alkaline alkaline potassium per-sulfate digestion ultraviolet spectrophotometry (HJ636-2012) is X1mg/L, and the nitrate nitrogen of measuring another duplicate samples with gas-phase molecular absorption spectrometry method (HJ/T199-2005) is X2mg/L.
The back is absorbed by water because ammonia is escaped, and the form with ammoniacal nitrogen in water exists, and according to the nitrogen element conservation, then can calculate amount of ammonia slip, principle as shown in the formula:
Wherein, NH
3With NH
4 +The mole fraction ratio be 0.944;
Computing method are following:
Record that total nitrogen is in the solution: X1, mg/L;
The nitrate nitrogen that records in the solution is: X2, mg/L;
The total nitrogen that records blank water is: X3, mg/L;
Derive in the solution ammoniacal nitrogen be: X1-X2-X3, mg/L;
Derive in the solution ammoniacal nitrogen total amount be: the mg of V * (X1-X2-X3);
Final that unit volume flue gas amount of ammonia slip is: V * (X1-X2-X3) }/Q * 0.944
=5（X1-X2-X3）/300×0.944
=0.0157（X1-X2-X3）mg/L?。
Claims (4)
1. the assay method of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology, it is characterized in that: this method comprises the steps:
1) sinter fume that discharges after the ammonia process of desulfurization is removed dust wherein with the conventional filtration means;
2) get blank water, measure the total nitrogen content in the blank water with conventional method;
3) will pass through the appearance gas metering that step 1) handles and charge into capacity step 2) in the said blank water, so that the ammonia in the appearance gas is all soluble in water;
4) measure respectively through total nitrogen content and nitrate nitrogen content in the WS after the step 3) processing with conventional method; Deduct the total nitrogen content of blank water again with the difference of the total nitrogen content of the WS and nitrate nitrogen content, can obtain the data of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology.
2. the determinator of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology; It is characterized in that: it comprises the water container (10) of sealing, and water container (10) is provided with gas outlet (11), and water container (10) links to each other with wireway (8) simultaneously; Wireway (8) end stretches in the water container (10); Wireway (8) head end is connected with the output terminal of metering aspiration pump (7), and the input end of metering aspiration pump (7) is connected with the end of draft tube (6), and the head end of draft tube (6) is connected with filtration unit (1).
3. the determinator of amount of ammonia slip in the sintering flue gas ammonia method desulfurizing technology according to claim 2 is characterized in that: the end of said wireway (8) is provided with gas distributor (12).
4. according to the determinator of amount of ammonia slip in claim 2 or the 3 described sintering flue gas ammonia method desulfurizing technologies, it is characterized in that: be respectively equipped with valve (9) on said wireway (8) and the gas outlet (11).
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Cited By (4)
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| CN103033600A (en) * | 2012-12-12 | 2013-04-10 | 武汉钢铁(集团)公司 | Determination method and determination device for ammonia escape |
| CN103196630A (en) * | 2013-03-13 | 2013-07-10 | 浙江省电力公司电力科学研究院 | Method and device of evaluating accuracy of ammonia escape monitoring value |
| CN105021773A (en) * | 2015-07-13 | 2015-11-04 | 南通亚泰工程技术有限公司 | Ammonia escape analytical equipment of SCR system and application method of equipment |
| CN106198860A (en) * | 2016-06-28 | 2016-12-07 | 盐城工学院 | A kind of method and system of the escaping of ammonia detection |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20240002057A (en) * | 2022-06-28 | 2024-01-04 | 에스케이이노베이션 주식회사 | Method for monitoring odor-causing substances in flue gas |
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Cited By (5)
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| CN103033600A (en) * | 2012-12-12 | 2013-04-10 | 武汉钢铁(集团)公司 | Determination method and determination device for ammonia escape |
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| CN105021773A (en) * | 2015-07-13 | 2015-11-04 | 南通亚泰工程技术有限公司 | Ammonia escape analytical equipment of SCR system and application method of equipment |
| CN106198860A (en) * | 2016-06-28 | 2016-12-07 | 盐城工学院 | A kind of method and system of the escaping of ammonia detection |
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