CN105784692A - Method for determining sulfur dioxide in flue gas - Google Patents
Method for determining sulfur dioxide in flue gas Download PDFInfo
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- CN105784692A CN105784692A CN201410779828.1A CN201410779828A CN105784692A CN 105784692 A CN105784692 A CN 105784692A CN 201410779828 A CN201410779828 A CN 201410779828A CN 105784692 A CN105784692 A CN 105784692A
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Abstract
The invention relates to a method for determining sulfur dioxide in flue gas. The method comprises the following steps: 1) flue gas is preheated; 2) the preheated flue gas is introduced into a Pei porous gas glass absorption cell 2 containing V1L of an iodine solution whose concentration is known; 3) when blue color in the iodine solution is totally faded, a flue gas valve 5 is closed, and volume of the flue gas is read through a volume accumulated flowmeter 3 which is connected to an outlet of the Pei porous gas glass absorption cell 2; 4) concentration of sulfur dioxide in the flue gas is calculated. The method for determining sulfur dioxide in flue gas can effectively solve the problem that water vapor in the flue gas coagulates into water which absorbs SO2, which leads to a lower detection result; heat tracing is carried out by self temperature of the flue gas, extra adding apparatus are not needed, so that the method has the advantages of simple operation, easy collection of required materials, and low cost.
Description
Technical field
Present invention relates particularly to the assay method of a kind of sulfur dioxide in flue gas.
Background technology
Containing a certain amount of SO in refinery's flue gas2, discharge, to contaminated environment in air, therefore needs its content is carried out Accurate Determining.Sulfur dioxide gas Nature comparison is stable, the test instrunment with SO 2 sensor is generally adopted directly to measure at present, although current assay method can accurately measure the content of sulfur dioxide in flue gas, however require that the specific test instrunment of employing, not only cost is of a relatively high, and detection range has a definite limitation (detection of SO 2 sensor is limited to 150ppm).
Meanwhile, use Instrument measuring higher because of flue-gas temperature, and containing steam, meet cold after condense into water, not only absorb the SO in flue gas2And pollute instrument detecting device, and cause measurement result on the low side or cause instrument bad, complex operation data redundancy difference and Instrument purchase and use cost are high.
Summary of the invention
The problem that the assay method that it is an object of the invention to overcome prior art is relatively costly, detection range is limited, cannot accurately measure content of sulfur dioxide.
For this, the invention provides the assay method of a kind of sulfur dioxide in flue gas, comprise the following steps:
Step 1) opens gas fume valve, by the heating device being connected with exhanst gas outlet, flue gas is carried out preheating 8 ~ 12 minutes；
Step 2) by preheating after flue gas lead to equipped withIn the Pei Shi porous gas glass absorption cell of L concentration known iodine solution, in this iodine solution, dropping has 2-3 to drip starch indicator, and now iodine solution is blue；
Step 3), when the blueness of iodine solution all takes off most, is closed gas fume valve, and is read the volume of flue gas by the volume flow quantity recorder being connected with the outlet of Pei Shi porous gas glass absorption cell；
Step 4) calculates sulfur dioxide in flue gas concentration:
Wherein:Iodine solution concentration, mol/L；
Sulfur dioxide in flue gas content, g/L；
Iodine solution volume, L；
Flue gas volume, L；
64 sulfur dioxide relative molecular weights, g/mol
Described heating device is made up of the dual pathways flue gas sampling head connected with exhanst gas outlet, the interior heat-resistant hose connected with Pei Shi porous gas glass absorption cell by dual pathways flue gas sampling head and the outer heat-resistant hose that is placed in outside interior heat-resistant hose；
Described dual pathways flue gas sampling head is respectively arranged at two ends with gas production import and gas production outlet, this gas production import connects with exhanst gas outlet, described gas production outlet includes interior gas production outlet and outer gas production outlet, this interior gas production interface passes into after being connected with interior heat-resistant hose in Pei Shi porous gas glass absorption cell, and outer gas production outlet is connected with outer heat-resistant hose.
Described interior gas production outlet and outer gas production outlet diameter ratio are for 1:4.
Described volume integrated flow is calculated as wet gas flow meter.
The invention has the beneficial effects as follows: the assay method of this sulfur dioxide in flue gas provided by the invention can effectively solve steam coagulation in flue gas and become water to absorb SO2Causing the problem that measurement result is on the low side, it is possible to use flue gas own temperature carries out heat tracing, it is not necessary to additionally increase adding apparatus, and this method is simple to operate, material requested is prone to collect, less costly.
Accompanying drawing explanation
Fig. 1 is the overall flow schematic diagram of the present invention；
Fig. 2 is the structural representation of dual pathways flue gas sampling head 1.
In figure: 1, dual pathways flue gas sampling head；2, Pei Shi porous gas glass absorption cell；3, volume flow quantity recorder；4, exhanst gas outlet；5, gas fume valve；6, interior heat-resistant hose；7, outer heat-resistant hose；8, gas production import；9, interior gas production outlet；10, outer gas production outlet.
Detailed description of the invention
Embodiment 1:
Present embodiments provide the assay method of a kind of sulfur dioxide in flue gas as shown in Figure 1, comprise the following steps:
Step 1) opens gas fume valve 5, by the heating device being connected with exhanst gas outlet 4, flue gas is carried out preheating 8 ~ 12 minutes；
Step 2) by preheating after flue gas lead to equipped withIn the Pei Shi porous gas glass absorption cell 2 of L concentration known iodine solution, in this iodine solution, dropping has 2-3 to drip starch indicator, and now iodine solution is blue；
Step 3), when the blueness of iodine solution all takes off most, is closed gas fume valve 5, and is read the volume of flue gas by the volume flow quantity recorder 3 being connected with the outlet of Pei Shi porous gas glass absorption cell 2；
Step 4) calculates sulfur dioxide in flue gas concentration:
Wherein:Iodine solution concentration (concentration known iodine solution), mol/L；
Sulfur dioxide in flue gas content, g/L；
Iodine solution volume, L；
Flue gas volume, L；
64 sulfur dioxide relative molecular weights, g/mol
Heating device is made up of the dual pathways flue gas sampling head 1 connected with exhanst gas outlet 4, the interior heat-resistant hose 6 connected with Pei Shi porous gas glass absorption cell 2 by dual pathways flue gas sampling head 1 and the outer heat-resistant hose 7 that is placed in outside interior heat-resistant hose 6；
Dual pathways flue gas sampling head 1 is respectively arranged at two ends with gas production import 8 and gas production outlet, this gas production import 8 connects with exhanst gas outlet 4, described gas production outlet includes interior gas production outlet 9 and outer gas production outlet 10, this interior gas production interface passes into after being connected with interior heat-resistant hose 6 in Pei Shi porous gas glass absorption cell 2, and outer gas production outlet 10 is connected with outer heat-resistant hose 7.Interior gas production outlet 9 and outer gas production export 10 diameters ratio for 1:4, and volume flow quantity recorder 3 is wet gas flow meter.
The preparation of iodine solution: accurately weigh 1.27g powdered pure iodine (AR level), and claim 4g potassium iodide, with a small amount of water so as to be completely dissolved, proceeds in 1000ml volumetric flask, and constant volume 1000ml shakes up, takes this solution dilution 100 times, obtain 5 × 10-5The iodine solution of mol/L.
Principles of the invention is: sulfur dioxide has reproducibility, can make iodine (I2) it is reduced into iodide ion (I-), when sulfur dioxide passes in iodamylum solution, then solution is become colorless by blueness:
SO2+I2+2H2O=H2SO4+2HI。
Embodiment 2:
On the basis of embodiment 1, it is connected with interior gas production outlet 9, outer gas production outlet 10 respectively with interior heat-resistant hose 6, outer heat-resistant hose 7, when not connecting Pei Shi porous gas glass absorption cell 2, carefully open gas fume valve 5, connect flue gas and carry out preheating 10 minutes by heating device, it is prevented that in flue gas, steam pipe in heat tracing condenses.Accurately pipette a certain amount of 5 × 10-5The iodine solution of mol/L, injects Pei Shi porous gas glass absorption cell 2, adds 2-3 and drip starch indicator, and now solution is in blueness, connects wet gas flow meter with silica gel tube and exports with Pei Shi porous gas glass absorption cell 2.Turn down gas fume valve 5, the interior heat-resistant hose 6 of heating device is connected to Pei Shi porous gas glass absorption cell 2 entrance, and start recording flowmeter volumetric quantities, slowly open big gas fume valve 5 again, the gas enabling entrance absorption cell forms the bubble risen on interval, to ensure that the sulfur dioxide in flue gas is fully absorbed, when the blueness of solution all takes off most, close gas fume valve 5 immediately, read wet gas flow meter and be obtained through the flue gas volume of absorption cell, concrete detection example is in Table 1:
Table 1 sulfur dioxide in flue gas testing result
In sum, the assay method of this sulfur dioxide in flue gas provided by the invention can effectively solve steam coagulation in flue gas become water absorb SO2Causing the problem that measurement result is on the low side, it is possible to use flue gas own temperature carries out heat tracing, it is not necessary to additionally increase adding apparatus, and this method is simple to operate, material requested is prone to collect, less costly.
The present embodiment does not have specifically described part to broadly fall into known general knowledge and the known technology of the art, no longer describes in detail one by one herein.
Exemplified as above is only illustration to the present invention, is not intended that the restriction to protection scope of the present invention, every belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (4)
1. the assay method of sulfur dioxide in flue gas, it is characterised in that comprise the following steps:
Step 1) opens gas fume valve (5), by the heating device being connected with exhanst gas outlet (4), flue gas is carried out preheating 8 ~ 12 minutes；
Step 2) by preheating after flue gas lead to equipped withIn Pei Shi porous gas glass absorption cell (2) of L concentration known iodine solution, in this iodine solution, dropping has 2-3 to drip starch indicator, and now iodine solution is blue；
Step 3), when the blueness of iodine solution all takes off most, is closed gas fume valve (5), and is read the volume of flue gas by the volume flow quantity recorder (3) being connected with Pei Shi porous gas glass absorption cell (2) outlet；
Step 4) calculates sulfur dioxide in flue gas concentration:
Wherein:Iodine solution concentration, mol/L；
Sulfur dioxide in flue gas content, g/L；
Iodine solution volume, L；
Flue gas volume, L；
64 sulfur dioxide relative molecular weights, g/mol.
2. the assay method of sulfur dioxide in flue gas according to claim 1, it is characterised in that: described heating device is by dual pathways flue gas sampling head (1) connected with exhanst gas outlet (4), the interior heat-resistant hose (6) dual pathways flue gas sampling head (1) connected with Pei Shi porous gas glass absorption cell (2) and is placed in interior heat-resistant hose (6) outer heat-resistant hose (7) outward and forms；
Described dual pathways flue gas sampling head (1) is respectively arranged at two ends with gas production import (8) and gas production outlet, this gas production import (8) connects with exhanst gas outlet (4), described gas production outlet includes interior gas production outlet (9) and outer gas production outlet (10), this interior gas production interface passes in Pei Shi porous gas glass absorption cell (2) after being connected with interior heat-resistant hose (6), and outer gas production outlet (10) is connected with outer heat-resistant hose (7).
3. the assay method of sulfur dioxide in flue gas according to claim 1, it is characterised in that: described interior gas production outlet (9) and outer gas production export (10) diameter ratio for 1:4.
4. the assay method of sulfur dioxide in flue gas according to claim 1, it is characterised in that: described volume flow quantity recorder (3) is wet gas flow meter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290718A (en) * | 2016-07-22 | 2017-01-04 | 苏州优谱德精密仪器科技有限公司 | Gas analysis and absorption plant |
| CN106525833A (en) * | 2016-11-08 | 2017-03-22 | 江苏中烟工业有限责任公司 | Method for determining sulfur dioxide in cigarette main stream smoke through a continuous flow analyzer |
| CN109613173A (en) * | 2018-12-21 | 2019-04-12 | 陕西延长石油（集团）有限责任公司延安石油化工厂 | A kind of method that constant-current titration measures mercaptan sulfur in gas |
| CN109959625A (en) * | 2019-03-21 | 2019-07-02 | 成都凯天电子股份有限公司 | On-line analysis detects SO2The method of content |
| CN113447604A (en) * | 2021-05-28 | 2021-09-28 | 中国石油化工股份有限公司 | Be arranged in simultaneous detection flue gas SO2、SO3Apparatus and method of |
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| JP4817713B2 (en) * | 2005-05-20 | 2011-11-16 | 株式会社堀場製作所 | Method and apparatus for analyzing sulfur compounds |
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| JP2013040825A (en) * | 2011-08-12 | 2013-02-28 | Jfe Steel Corp | Analysis method and analyzer |
| CN203101274U (en) * | 2013-03-04 | 2013-07-31 | 中国人民共和国黄岛出入境检验检疫局 | Device for detecting sulfur dioxide residue |
| CN203572812U (en) * | 2013-10-29 | 2014-04-30 | 河北冀衡集团有限公司蓝天分公司 | Device for measuring concentration of sulfur dioxide at outlet of converter during production of sulfuric acid |
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| JP4817713B2 (en) * | 2005-05-20 | 2011-11-16 | 株式会社堀場製作所 | Method and apparatus for analyzing sulfur compounds |
| JP2013040825A (en) * | 2011-08-12 | 2013-02-28 | Jfe Steel Corp | Analysis method and analyzer |
| CN102323264A (en) * | 2011-09-30 | 2012-01-18 | 中国冶金矿业鞍山冶金设计研究院有限责任公司 | Method and device for testing content of sulfur in iron ore |
| CN203101274U (en) * | 2013-03-04 | 2013-07-31 | 中国人民共和国黄岛出入境检验检疫局 | Device for detecting sulfur dioxide residue |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290718A (en) * | 2016-07-22 | 2017-01-04 | 苏州优谱德精密仪器科技有限公司 | Gas analysis and absorption plant |
| CN106525833A (en) * | 2016-11-08 | 2017-03-22 | 江苏中烟工业有限责任公司 | Method for determining sulfur dioxide in cigarette main stream smoke through a continuous flow analyzer |
| CN109613173A (en) * | 2018-12-21 | 2019-04-12 | 陕西延长石油（集团）有限责任公司延安石油化工厂 | A kind of method that constant-current titration measures mercaptan sulfur in gas |
| CN109959625A (en) * | 2019-03-21 | 2019-07-02 | 成都凯天电子股份有限公司 | On-line analysis detects SO2The method of content |
| CN113447604A (en) * | 2021-05-28 | 2021-09-28 | 中国石油化工股份有限公司 | Be arranged in simultaneous detection flue gas SO2、SO3Apparatus and method of |
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| CN105784692B (en) | 2018-08-14 |
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Address after: 727406 Yanan refinery, Jiao Kou Town, Luochuan, Yanan, Shaanxi Patentee after: Shaanxi Yanchang Petroleum (Group) Co., Ltd. Yanan oil refinery Address before: 727406 Shaanxi Yulin Jingbian Hedong Yulin refinery Patentee before: Shaanxi Yanchang Petroleum (Group) Co., Ltd. Yanan oil refinery |
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