CN201828439U - Sampling device of sulphur dioxide gas in flue - Google Patents

Sampling device of sulphur dioxide gas in flue Download PDF

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Publication number
CN201828439U
CN201828439U CN2010205847276U CN201020584727U CN201828439U CN 201828439 U CN201828439 U CN 201828439U CN 2010205847276 U CN2010205847276 U CN 2010205847276U CN 201020584727 U CN201020584727 U CN 201020584727U CN 201828439 U CN201828439 U CN 201828439U
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CN
China
Prior art keywords
flue
sampling
glass capillary
sulphur dioxide
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2010205847276U
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Chinese (zh)
Inventor
马先锋
柯鹏振
刘明阳
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HUBEI ENVIRONMENT MONITORING CENTRAL STATION
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HUBEI ENVIRONMENT MONITORING CENTRAL STATION
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Priority to CN2010205847276U priority Critical patent/CN201828439U/en
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Publication of CN201828439U publication Critical patent/CN201828439U/en
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Abstract

The utility model relates to a sampling device of sulphur dioxide gas in a flue, wherein a sampling pipe is a glass capillary tube externally sheathed with a stainless steel sleeve; one end of the glass capillary tube is connected with the extract opening of an air sampler through a silica gel connecting pipe, and a first and a second gas absorption bottles. In the sampling process, the other end of the glass capillary tube fully stretches into the flue, the air sampler is opened, the extract opening of the air sampler extracts the sulphur dioxide in the flue, and the sulphur dioxide is collected to the gas absorption bottles. After sampling, a little absorption liquid is sucked by a syringe for rinsing the glass capillary tube (1) and the silica gel connecting pipe, the rinsing liquid is moved to the second gas absorption bottle, and the absorption liquid in the gas absorption bottle is brought to the laboratory room for analysis. The sampling device is simple in structure, convenient in operation and low in manufacturing cost, and can determine sulphur dioxide with the concentration smaller than 100mg per cubic meter under the situations of large flue negative pressure and high moisture content with accurate determination result. The sampling device can be suitable for collection and determination of sulphur dioxide in a flue with high moisture content and large negative pressure.

Description

Sulfur dioxide gas sampling apparatus in the flue
Technical field
The utility model relates to sulfur dioxide gas sampling apparatus in a kind of flue.
Background technology
At present, use the method for sulphuric dioxide in the more general mensuration flue to have three kinds: a kind of is constant potentiometric electrolysis, sulfur dioxide gas is extracted into electrochemical sensor by pump in the flue, produce weak current with electrolyte reaction in the electrochemical cell, size of current is directly proportional with sulfur dioxide concentration in the finite concentration scope.This method is a kind of portable method, finding speed very fast (5-10min goes out data).Be suitable for satisfying simultaneously the flue sulphur dioxide measuring of following three conditions: (1) gaseous state is stable, because real minute is very short, usually at 2-5min, what draw is instantaneous value; (2) water capacity is lower, and water capacity is too high to exert an influence to electrochemical reaction; (3) flue negative pressure is unsuitable excessive, and negative pressure is excessive, and sulphuric dioxide can not be extracted into fully in the flue, makes measurement result on the low side.Because this method is portable method, accuracy will differ from relatively, and is especially good inadequately to the accuracy of measurement less than the 100mg/m3 sulfur dioxide gas simultaneously.
Second kind is iodimetric titration, and the principle of this method is after quantitative sulphuric dioxide adds iodine solution it to be faded, and calculates the concentration of sulphuric dioxide by the content that consumes iodine solution.This method is suitable for the mensuration of the sulphuric dioxide of high concentration, because manual operations is more loaded down with trivial details, and the existing at present trend that is replaced by constant potentiometric electrolysis.
The third is to absorb back chemical method (spectrophotometric method), by pump with sulfur dioxide gas after absorption bottle absorbs, measure the sulfur dioxide concentration of absorption liquid, thereby calculate sulfur dioxide concentration in the flue.This method is for 100mg/m 3Following concentration has accuracy preferably.But can't overcome the influence of factors such as the excessive and excess moisture of flue negative pressure in this method at present.
Summary of the invention
The purpose of this utility model is at above-mentioned present situation, aims to provide a kind of reaching more greatly at flue negative pressure and can measure concentration under the water capacity condition with higher less than 100mg/m 3Sulphuric dioxide, and sulfur dioxide gas sampling apparatus in the high flue of measurement result accuracy.
The implementation of the utility model purpose is, sulfur dioxide gas sampling apparatus in the flue, sampling pipe is the glass capillary of outer casing stainless steel sleeve, one end of glass capillary connects the import of the first gas absorption bottle by the silica gel connecting leg, the outlet of the first gas absorption bottle connects the import of second absorption bottle by silicone tube, and the outlet of the second gas absorption bottle connects the bleeding point of air sampler by silica gel communicating pipe.
The utility model is simple in structure, easy and simple to handle, low cost of manufacture.Can reach more greatly at flue negative pressure and measure concentration under the water capacity condition with higher less than 100mg/m 3Sulphuric dioxide, measurement result is accurate.The utility model is applicable to the collection and the mensuration of the bigger flue sulphuric dioxide of water percentage height and negative pressure.
Description of drawings
Accompanying drawing is the utility model structural representation.
Embodiment
The utility model is described in detail in detail with reference to the accompanying drawings.
With reference to accompanying drawing, sampling pipe is the glass capillary 1 of outer casing stainless steel sleeve 2, one end of glass capillary connects the import of the first gas absorption bottle 4 by silica gel connecting leg 3, the outlet of the first gas absorption bottle is by the import of silicone tube 5 connections second absorption bottle 6, and the outlet of the second gas absorption bottle connects the bleeding point of air samplers 8 by silica gel communicating pipe 7.Air sampler 8 is the TH-118 model that rainbow instrument and meter company limited produces.
Glass capillary 1 long 1-2m, internal diameter is 1-2mm, external diameter 6-10mm.The stainless steel sleeve 2 that glass capillary 1 overcoat one is bigger slightly than glass tube external diameter, length sleeve is 0.9-1.9m, glass capillary and sleeve relative fixed are in case the glass capillary fracture.
Why the utility model selects the glass capillary of this model as sampling pipe, is for following several reasons:
(1) sampling pipe is a glass material, be difficult for absorption sulphuric dioxide, and water-soluble sulphuric dioxide is easy to be eluted in the sampling bottle on the tube wall;
(2) sampling pipe is a kapillary, internal diameter 1-2mm, because for the negative-pressure type flue, under the certain situation of negative pressure, sample tube inner diameter is big more, and the negative pressure that sampling pump bears is big more, when the draft of pump is not enough, just gathers less than sulfur dioxide gas; But sample tube inner diameter is also unsuitable too small, and too small because of internal diameter, the dust in the flue easily stops up sampling pipe; Select the sampling pipe of internal diameter 1-2mm in addition for use, help that water miscible sulphuric dioxide is inhaled in the absorption bottle in the gas, make water-soluble sulphuric dioxide suck-back in flue, sampling efficiency is reduced if internal diameter is crossed conference;
(3) about length 1.5m, during sampling sampling pipe is all filled in the flue, sampling pipe is too short, and sampled point is rested near the flue thief hatch, and the flue gas of Cai Jiing can not be represented the gas in the flue like this, especially to the negative pressure flue.
Silica gel connecting leg 3, silicone tube 5, silica gel communicating pipe 7 are adopted the hard silicone rubber tube that is difficult for absorption sulphuric dioxide, to guarantee sealing.The hard silicone rubber tube of connecting portion will be lacked, in case sulphuric dioxide too much absorption on silicone rubber tube.
The utility model when sampling, the other end of glass capillary 1 is stretched into flue fully, stretch into the about 1.4m of flue length, air sampler 8 to be opened, the bleeding point of air sampler 8 is drawn into the sulphuric dioxide in the flue, and collects the first gas absorption bottle.After having adopted, inhale a little absorption liquid with glass capillary 1 and the rinse of silica gel connecting leg with syringe, rinse liquid changes in the second gas absorption bottle 6, and the absorption liquid in the second gas absorption bottle is taken back lab analysis.

Claims (3)

1. sulfur dioxide gas sampling apparatus in the flue, it is characterized in that sampling pipe is the glass capillary of outer casing stainless steel sleeve, one end of glass capillary connects the import of the first gas absorption bottle by the silica gel connecting leg, the outlet of the first gas absorption bottle connects the import of second absorption bottle by silicone tube, and the outlet of the second gas absorption bottle connects the bleeding point of air sampler by silica gel communicating pipe.
2. sulfur dioxide gas sampling apparatus in the flue according to claim 1 is characterized in that the long 1-2m of glass capillary (1), and internal diameter is 1-2mm, external diameter 6-10mm.
3. sulfur dioxide gas sampling apparatus in the flue according to claim 1 is characterized in that the long 0.9-1.9m of stainless steel sleeve (2) of glass capillary (1) overcoat.
CN2010205847276U 2010-10-26 2010-10-26 Sampling device of sulphur dioxide gas in flue Expired - Fee Related CN201828439U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205847276U CN201828439U (en) 2010-10-26 2010-10-26 Sampling device of sulphur dioxide gas in flue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205847276U CN201828439U (en) 2010-10-26 2010-10-26 Sampling device of sulphur dioxide gas in flue

Publications (1)

Publication Number Publication Date
CN201828439U true CN201828439U (en) 2011-05-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010205847276U Expired - Fee Related CN201828439U (en) 2010-10-26 2010-10-26 Sampling device of sulphur dioxide gas in flue

Country Status (1)

Country Link
CN (1) CN201828439U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103197087A (en) * 2012-01-09 2013-07-10 北京瑞利分析仪器有限公司 Automatic sampler sampling needle used for strong acidic solution
CN103852351A (en) * 2014-03-25 2014-06-11 济钢集团有限公司 Sampling device and sampling method for pumping gas sample in self-negative-pressure pipeline

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103197087A (en) * 2012-01-09 2013-07-10 北京瑞利分析仪器有限公司 Automatic sampler sampling needle used for strong acidic solution
CN103852351A (en) * 2014-03-25 2014-06-11 济钢集团有限公司 Sampling device and sampling method for pumping gas sample in self-negative-pressure pipeline
CN103852351B (en) * 2014-03-25 2016-04-13 济钢集团有限公司 A kind of sampler of extracting gases sample in negative-pressure pipeline and sampling method

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110511

Termination date: 20111026

C17 Cessation of patent right