CN102654430B - Method for detecting gas tightness of denitration apparatus in laboratory - Google Patents

Method for detecting gas tightness of denitration apparatus in laboratory Download PDF

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Publication number
CN102654430B
CN102654430B CN201210149241.3A CN201210149241A CN102654430B CN 102654430 B CN102654430 B CN 102654430B CN 201210149241 A CN201210149241 A CN 201210149241A CN 102654430 B CN102654430 B CN 102654430B
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nitrogen storage
gas tank
flue gas
laboratory
impermeability
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CN201210149241.3A
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CN102654430A (en
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谢峻林
陈俊孚
方德
何峰
付争兵
张媛
李豫梅
兰雪勇
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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Abstract

The invention provides a method for detecting the gas tightness of a denitration apparatus in a laboratory, comprising the steps of: 1) detecting the gas tightness of a sucking pump and a nitrogen storage tank respectively, and starting step 2) if the gas tightness is good; 2) connecting the nitrogen storage tank to a smoke analyzer, determining whether an oxygen value detected by the smoke analyzer is less than or equal to 2%, and if so, starting step 3); 3) orderly connecting the nitrogen storage tank to a sampler and the smoke analyzer, determining whether an oxygen value detected by the smoke analyzer is less than or equal to 2%, and if so, starting step 4); step 4) orderly connecting the nitrogen storage tank to a gas distributor, the sucking pump and the smoke analyzer, determining whether an oxygen value detected by the smoke analyzer is less than or equal to 2%, and if so, starting step 5); and 5) orderly connecting the nitrogen storage tank to the gas distributor, a reactor, the sampler, the sucking pump and the smoke analyzer, determining whether an oxygen value detected by the smoke analyzer is less than or equal to 2%, and if so, completing the detection of the gas tightness of the denitration apparatus in the laboratory. The method is simple and accurate, the cost is low and the efficiency is high.

Description

The bubble-tight detection method of a kind of laboratory denitration device
Technical field
The present invention relates to tail gas denitration technology field, relate in particular to the bubble-tight detection method of a kind of laboratory denitration device.
Background technology
Laboratory simulation tail gas denitrification apparatus is a kind of a set of equipment of simulating nitrous oxides selectivity catalytic reaction in industrial tail gas, and this reaction principle is: .
As shown in Figure 1, this laboratory simulation tail gas denitrification apparatus mainly comprises nitrogen storage gas tank 1, other unstrpped gas gas-holder 2, distributing instrument 3, catalytic reactor 4, heating furnace 5, sampling thief 6, aspiration pump 7, flue gas analyzer 8 and connecting line each other.This equipment is gas reaction equipment, has multiple reactant gas, and unstrpped gas is chosen as poisonous gas NO, and equipment impermeability is had relatively high expectations, and catalyzer transformation efficiency formula is:
NO concentration before η=(the rear NO concentration of NO concentration-reaction before reaction)/reaction
Before reaction, NO concentration is controlled by distributing instrument, and after reaction, NO concentration detects by infrared flue gas analyzer.Once each parts of this equipment install or use procedure in the phenomenon that leaks air, airborne oxygen will cause NO occur oxidation reaction ( ), affect the accuracy of testing result.And there is colourless, tasteless feature in NO gas, if there is gas leakage, also exist observation difficult, check difficult feature.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of simple to operate, bubble-tight detection method of laboratory denitration device is accurately provided.
The present invention solves the problems of the technologies described above taked technical scheme to be:
The bubble-tight detection method of laboratory denitration device, is characterized in that, it comprises the following steps:
1) detect respectively the impermeability of aspiration pump and nitrogen storage gas tank, if impermeability is good, enter step 2);
2) described nitrogen storage gas tank is connected on flue gas analyzer, opens described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 3), otherwise show flue gas analyzer gas leakage;
3) described nitrogen storage gas tank is connected to sampling thief and flue gas analyzer successively, open described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 4), otherwise show sampling thief gas leakage;
4) described nitrogen storage gas tank is connected to distributing instrument, aspiration pump and flue gas analyzer successively, open described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 5), otherwise show distributing instrument gas leakage;
5) described nitrogen storage gas tank is connected to distributing instrument, reactor, sampling thief, aspiration pump and flue gas analyzer successively, open described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, be that denitration device bubble-tight detection in described laboratory finishes, otherwise show reactor gas leakage.
In such scheme, the purity of the nitrogen of described nitrogen storage gas tank output is 99.9%.
In such scheme, the flow of the nitrogen of described nitrogen storage gas tank output is 5L/min.
In such scheme, the oxygen purity numerical value that flue gas analyzer detects, for being greater than 2% while being less than 5%, shows micro-leakage; Oxygen purity numerical value is 5% when above, shows that gas leakage is serious.
In such scheme, the impermeability step that detects aspiration pump in described step 1) is: the one end that the delivery side of pump of bleeding is connected to an inverted U-shaped flexible pipe, other end water filling toward described U-shaped flexible pipe, shows that described aspiration pump impermeability is good if the water column of described U-shaped flexible pipe is unchanged; If without water column, show aspiration pump gas leakage.
In such scheme, the impermeability step that detects nitrogen storage gas tank in described step 1) is: soap bubble solution is smeared to the valve interface place of nitrogen storage gas tank, the variation by number of bubbles detects impermeability.
Principle of the present invention is: utilize the feature that has the oxygen of 20% volume fraction in air, when equipment being purged with pure nitrogen gas (purity is 99.9%), if device leaks gas, airborne oxygen can be sneaked in nitrogen, and flue gas analyzer can detect oxygen.Therefore can be by detecting within the standard time, the detected oxygen purity numerical value of flue gas analyzer carrys out the impermeability of accurate judgment means.Oxygen purity numerical value is between 0.1-2%, shows that device impermeability is good; If oxygen purity numerical value is between 2-5%, show the micro-leakage of device, if oxygen purity numerical value is more than 5%, show that device gas leakage is serious.
The invention has the beneficial effects as follows: utilize the method to detect laboratory denitration device impermeability, operation is simple, accurate, cost is low, efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of laboratory denitrification apparatus.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and certain following embodiment should not be construed as limitation of the present invention.
The invention provides the bubble-tight detection method of a kind of laboratory denitration device, it comprises the following steps:
1) detect respectively the impermeability of aspiration pump and nitrogen storage gas tank, if impermeability is good, enter step 2);
2) described nitrogen storage gas tank is connected on flue gas analyzer, opens described nitrogen storage gas tank, after ten minutes, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 3), otherwise show flue gas analyzer gas leakage;
3) described nitrogen storage gas tank is connected to sampling thief and flue gas analyzer successively, open described nitrogen storage gas tank, after ten minutes, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 4), otherwise show sampling thief gas leakage;
4) described nitrogen storage gas tank is connected to distributing instrument, aspiration pump and flue gas analyzer successively, open described nitrogen storage gas tank, after ten minutes, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 5), otherwise show distributing instrument gas leakage;
5) described nitrogen storage gas tank is connected to distributing instrument, reactor, sampling thief, aspiration pump and flue gas analyzer successively, open described nitrogen storage gas tank, after ten minutes, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, be that denitration device bubble-tight detection in described laboratory finishes, otherwise show reactor gas leakage.
The impermeability step that detects aspiration pump in step 1) is: the one end that the delivery side of pump of bleeding is connected to an inverted U-shaped flexible pipe, open the other end water filling of described U-shaped flexible pipe, if the water column of described U-shaped flexible pipe is unchanged, show that described aspiration pump impermeability is good; If without water column, show aspiration pump gas leakage.
The impermeability step that detects nitrogen storage gas tank in step 1) is: soap bubble solution is smeared to the valve interface place of nitrogen storage gas tank, and, by the variation of number of bubbles, detect impermeability.
In this enforcement, the purity of the nitrogen of selecting is 99.9%, and the flow of nitrogen is 5L/min.Be understandable that, can select according to the actual requirements the nitrogen that purity is higher or slightly low, the flow of nitrogen also can regulate as required, is not limited in the present embodiment selected.
In addition, the oxygen purity numerical value that flue gas analyzer detects, for being greater than 2% while being less than 5%, shows micro-leakage; Oxygen purity numerical value is 5% when above, shows that gas leakage is serious.
The pipeline of this laboratory catalytic denitration device can detect by the soap bubble of proportioning 5% concentration, uses stirring rod to spread upon each interface soap bubble solution, and the variation by number of bubbles detects impermeability.The bubble-tight detection method of other reacting gas gas-holder also can be with reference to the method.

Claims (4)

1. the bubble-tight detection method of laboratory denitration device, is characterized in that, it comprises the following steps:
1) detect respectively the impermeability of aspiration pump and nitrogen storage gas tank, if impermeability is good, enter step 2);
2) described nitrogen storage gas tank is connected on flue gas analyzer, opens described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 3), otherwise show flue gas analyzer gas leakage;
3) described nitrogen storage gas tank is connected to sampling thief and flue gas analyzer successively, open described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 4), otherwise show sampling thief gas leakage;
4) described nitrogen storage gas tank is connected to distributing instrument, aspiration pump and flue gas analyzer successively, open described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, is to enter step 5), otherwise show distributing instrument gas leakage;
5) described nitrogen storage gas tank is connected to distributing instrument, reactor, sampling thief, aspiration pump and flue gas analyzer successively, open described nitrogen storage gas tank, judge whether the oxygen purity numerical value that flue gas analyzer detects is less than or equal to 2%, be that denitration device bubble-tight detection in described laboratory finishes, otherwise show reactor gas leakage;
The impermeability step that detects aspiration pump in described step 1) is: the one end that the delivery side of pump of bleeding is connected to an inverted U-shaped flexible pipe, other end water filling toward described U-shaped flexible pipe, shows that described aspiration pump impermeability is good if the water column of described U-shaped flexible pipe is unchanged; If without water column, show aspiration pump gas leakage; The impermeability step that detects nitrogen storage gas tank in described step 1) is: soap bubble solution is smeared to the valve interface place of nitrogen storage gas tank, the variation by number of bubbles detects impermeability.
2. the bubble-tight detection method of laboratory as claimed in claim 1 denitration device, is characterized in that, the purity of the nitrogen of described nitrogen storage gas tank output is 99.9%.
3. the bubble-tight detection method of laboratory as claimed in claim 1 denitration device, is characterized in that, the flow of the nitrogen of described nitrogen storage gas tank output is 5L/min.
4. the bubble-tight detection method of laboratory as claimed in claim 1 denitration device, is characterized in that, the oxygen purity numerical value that flue gas analyzer detects, for being greater than 2% while being less than 5%, shows micro-leakage; Oxygen purity numerical value is 5% when above, shows that gas leakage is serious.
CN201210149241.3A 2012-05-15 2012-05-15 Method for detecting gas tightness of denitration apparatus in laboratory Expired - Fee Related CN102654430B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1482445A (en) * 2003-07-08 2004-03-17 北京金铠星科技有限公司 Exhaust analyzer sampling system leakage quantity checkout apparatus
CN201885861U (en) * 2010-11-15 2011-06-29 天津市谊诚包装制品有限责任公司 Steel drum leakage testing device
CN202133510U (en) * 2011-06-27 2012-02-01 常州爱特科技有限公司 Air suction sampling type multi-channel SF6 quantitative leakage alarm system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6135327A (en) * 1984-07-28 1986-02-19 Mitsubishi Heavy Ind Ltd Leakage detection of denitration reactor
JPH0510845A (en) * 1991-06-28 1993-01-19 Nippon Enjiniyaa Service Kk Device for inspecting mobile storage tank for leakage
KR100931794B1 (en) * 2008-08-21 2009-12-14 주식회사 디섹 Lng tank leak testing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1482445A (en) * 2003-07-08 2004-03-17 北京金铠星科技有限公司 Exhaust analyzer sampling system leakage quantity checkout apparatus
CN201885861U (en) * 2010-11-15 2011-06-29 天津市谊诚包装制品有限责任公司 Steel drum leakage testing device
CN202133510U (en) * 2011-06-27 2012-02-01 常州爱特科技有限公司 Air suction sampling type multi-channel SF6 quantitative leakage alarm system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JP昭61-35327A 1986.02.19
JP特开平5-10845A 1993.01.19

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