CN202453232U - Sample gas processing detecting system of online analyzer - Google Patents
Sample gas processing detecting system of online analyzer Download PDFInfo
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- CN202453232U CN202453232U CN 201120456819 CN201120456819U CN202453232U CN 202453232 U CN202453232 U CN 202453232U CN 201120456819 CN201120456819 CN 201120456819 CN 201120456819 U CN201120456819 U CN 201120456819U CN 202453232 U CN202453232 U CN 202453232U
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Abstract
The utility model relates to a sample gas processing detecting system of an online analyzer. The detecting system comprises a sampling valve, a water seal washing tank, a cooler, an oxygen analyzer and a Venturi tube which are sequentially connected. Because the water seal washing tank is used for removing dust and the cooler is used for dewatering, pulverized coal and water in sample gas are removed effectively, measurement accuracy of the oxygen analyzer is guaranteed, and normal production is guaranteed.
Description
Technical field
The utility model relates to a kind of appearance gas disposal detection system of on-line analysis instrument.
Background technology
In DCL/Direct coal liquefaction technology, raw coal will pass through coal-grinding to be become the coal dust that satisfies the certain particle size requirement and could use as raw material.If yet too high oxygen level in the pulverized coal system just coal dust has the danger of spontaneous combustion, for avoiding dangerous, needs the oxygen content in the on-line monitoring pulverized coal system, in pulverized coal system, replenishes an amount of nitrogen immediately in case oxygen content exceeds standard.Therefore, the oxygen content that detects exactly in the pulverized coal system seems very important.
The detection method of the oxygen content in the pulverized coal system is from pulverized coal system, to extract appearance gas out, detects through delivering to the on-line detector table after the pre-service.The coal dust preparation system of DCL/Direct coal liquefaction factory is little negative pressure system in the prior art, and appearance gas has a little a small amount of coal dust and steam, need carry out could detecting after the pre-service to it for this reason.
Pulverized coal system appearance gas disposal detection system is as shown in Figure 1 in the prior art, comprises the sampling valve 1, heating radiator 2, branch flow container 3, refrigeratory 4, grade one filter 5, air pump 6, secondary filter 7 and the oxygen analyzer 8 that connect successively.Under the swabbing action of air pump 6, the appearance gas of extracting out from pulverized coal system gets into heating radiator 2 through sampling valve 1, and the heat radiation back gets into separatory jar 3, gets in the refrigeratory 4 after the liquid phase in minute flow container 3 in the initial gross separation appearance gas.Wherein, cold-producing medium is a pressurized air in the refrigeratory 4, and this pressurized air gets into refrigeratory through whirlwind refrigerator 9.Appearance gas is removed moisture by Quench, gets into oxygen analyzer through grade one filter 5, secondary filter 7 successively then and detects 8.Wherein, air pump 6 is between grade one filter 5 and secondary filter 7.The dedusting of appearance gas is mainly accomplished by filtrator, and appearance gas is realized coarse filtration through grade one filter 5, filters the dust more than 75 microns, realizes smart the filtration through cascade filtration 7, filters the dust more than 10 microns.Be provided with tapping line in minute flow container 3 and refrigeratory 4 bottoms, discharge hydrops through discharge opeing hand valve.
Yet after coming into operation, this kind gas disposal detection system also has a lot of problems: at first,, cause the oxygen analyzer measuring error very big because the filtrator dedusting is not thorough, even Failure analysis appearance sensor; And owing to adopt air pump suction appearance gas, have micro-coal dust in the appearance gas and get into air pump, cause the frequent fault of air pump; In addition, owing to directly adopt the filtrator dedusting, it is frequent to cause the grade one filter filter core to be changed; In addition, owing to condensing of steam in the sample lines, can cause coal dust and water to mix and stop up sample lines.These problems cause producing and are difficult to normally carry out, and cause a large amount of economic losses.
The utility model content
In view of this, the purpose of the utility model is to provide a kind of appearance gas disposal detection system of on-line analysis instrument, is used to solve kind gas disposal and does not cause oxygen analyzer measuring error problem bigger than normal only.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of appearance gas disposal detection system of on-line analysis instrument comprises:
Sampling valve, said sampling valve one end connects pulverized coal system;
The water seal washing tank connects the sampling valve other end, and washing is from the appearance gas of said sampling valve;
The appearance gas that refrigeratory, Quench are drawn from said water seal washing tank top, and remove the moisture in kind gas;
The oxygen content of the appearance gas that oxygen analyzer, analysis are drawn from said refrigeratory top;
Venturi tube connects the outlet of said oxygen analyzer, is the mobile power that provides of appearance gas in the whole detection system.
Preferably, between said sampling valve and water seal washing tank, also be provided with dedusting tank.
Preferably, between refrigeratory and oxygen analyzer, also be provided with filtrator; Preferably, said filtrator filtering accuracy is the 6-10 micron, further to remove the coal dust in kind gas.
Preferably, said detection system also comprises the buffering water pot, and said buffering water pot is connected through pipeline with the bottom of water seal washing tank and refrigeratory.
Preferably, on the sampling pipeline between dedusting tank and the water seal washing tank, also be provided with blowback lines, the other end of said blowback lines is connected on the nitrogen pipeline, is used for that the sampling pipeline is carried out blowback and prevents that pipeline from stopping up.
Preferably, also set up the oxygen analyzer by-pass, and by-pass and oxygen analyzer inlet all is provided with spinner-type flowmeter at the two ends of oxygen analyzer.
Preferably, the tank body of said water seal washing tank is the transparent material preparation.
Visible by technique scheme; The utility model has the advantages that: owing to adopt dedusting tank, water seal washing tank and filtrator to remove the dust in the appearance gas effectively; Adopt condenser to remove the moisture in kind gas; The cleanliness factor of the appearance gas after therefore handling is very high, thereby has guaranteed the accuracy that oxygen analyzer is measured, and has reduced the damage that dust causes oxygen analyzer in the appearance gas.And also the nitrogen blowback lines can be set in the system, regularly the sampling pipeline is carried out blowback, thereby avoided in the sample lines because condensing of steam causes coal dust and water to mix the obstruction sample lines.In addition, abandoned the sample mode of air pump, adopted Venturi tube instrument wind injection to take out the negative pressure sampling, for system provides stable pressure of inspiration(Pi), and succinct, non-fault, guaranteed the stable operation of system effectively, guarantee normally is provided for what produce.
Description of drawings
Fig. 1 is an appearance gas disposal detection system synoptic diagram in the prior art;
The schematic flow sheet of a kind of embodiment of the appearance gas disposal detection system that Fig. 2 provides for the utility model;
The schematic flow sheet of the another kind of embodiment of the appearance gas disposal detection system that Fig. 3 provides for the utility model;
A kind of schematic flow sheet preferred embodiment of the appearance gas disposal detection system that Fig. 4 provides for the utility model;
The schematic flow sheet of a kind of further preferred embodiment of the appearance gas disposal detection system that Fig. 5 provides for the utility model.
Embodiment
Further specify the utility model below with reference to accompanying drawing, but therefore the utility model does not receive any restriction.
The schematic flow sheet of a kind of embodiment of the appearance gas disposal detection system that Fig. 2 provides for the utility model, said appearance gas disposal detection system comprises sampling valve 11, water seal washing tank 12, refrigeratory 13, oxygen analyzer 14 and Venturi tube 15.Wherein, sampling valve 11 1 ends connect pulverized coal system, and the other end is connected to water seal washing tank 12, with washing appearance gas, remove the dusts such as coal dust in the appearance gas; Said water seal washing tank 12 is connected to refrigeratory 13, with Quench appearance gas, removes the moisture in kind gas; Said refrigeratory 13 is connected to oxygen analyzer 14 through pipeline, to analyze the oxygen content in the appearance gas; Said oxygen analyzer 14 is connected to Venturi tube 15 through pipeline, and under the swabbing action of Venturi tube, appearance gas is discharged from.In addition, be provided with water injection pipe on the top of water seal washing tank 12, the bottom is provided with blow-off pipe, is used for changing the water of water seal washing tank 12.Bottom at refrigeratory 13 is provided with drainpipe equally, is used to get rid of the condensate water of refrigeratory 13 bottoms.
When this system moved, Venturi tube 15 was the mobile power that provides of appearance gas in the total system.Under the effect of Venturi tube 15 suction, enter into water seal washing tank 12 through sampling valve 11 from the appearance gas of pulverized coal system.Store the water that certain altitude is arranged in the said water seal washing tank 12, appearance gas is got into by water seal washing tank 12 bottoms, draws from water seal washing tank 12 tops through the washing back, and the coal dust in the appearance gas is removed from appearance gas after washing, and stays in the water.
Preferably, water seal washing tank 12 can adopt transparent organic material to make, conveniently to check liquid level and the water quality situation in the water seal washing tank 12, when the liquid level in the water seal washing tank 12 is low, through the water inlet pipe moisturizing on its top.Because impurity content is few in the steam condensate (SC), is fit to be used as kind gas washings, therefore further preferably, said water inlet pipe is connected to the steam condensate (SC) pipe, with the supplementing water of steam condensate (SC) as water seal washing tank 12.When the water quality in the water seal washing tank 12 is too poor, can influence the clean result of kind gas, at this moment, can sewage be discharged through the blow-off pipe of water seal washing tank 12 bottoms, water inlet pipe is changed steam condensate (SC) through the top, to guarantee the clean result of appearance gas.
The appearance gas of drawing from water seal washing tank 12 tops enters into the tube side of refrigeratory 13 through pipeline, and Quench is to remove moisture.The cold-producing medium of said condenser 13 can be pressurized air or similar refrigerant; When adopting pressurized air as refrigerant; Thereby the temperature that this pressurized air gets into the shell side reduction condenser 13 of condenser 13 through whirlwind refrigerator 21, its temperature control is to realize through controlling the compressed-air actuated amount that gets into the whirlwind refrigerator specifically.
Remove appearance gas behind the moisture and draw through pipeline from condenser 13 tops and be sent to oxygen analyzer 14, analyze oxygen content, the appearance gas after the analysis from oxygen analyzer 14 outlets through Venturi tube 15 dischargings it.Wherein, said Venturi tube 15 produces negative pressure through injection instrument wind, the appearance gas of suction pulverized coal system.Certainly, can also use other air-extractor to replace Venturi tube here, the appearance gas of suction pulverized coal system.
Fig. 3 shows the another kind of embodiment of the utility model, and the difference of itself and embodiment shown in Figure 2 is, between sampling valve 11 and water seal washing tank 12, also is provided with dedusting tank 17, is used for the preparatory dedusting of kind gas.Be provided with baffle plate in the said dedusting tank 17, what this baffle plate was vertical is fixed in the dedusting tank 17, and the appearance gas of entering dedusting tank 17 produces baffling at the baffle plate place, and passes through from the baffle plate below, and the part dust in the appearance gas is attached on the baffle plate, thus the preparatory dedusting of realization appearance gas.When dedusting tank 17 dust stratifications are too much, can regularly open dedusting tank 17 and remove.
Fig. 4 shows the preferred embodiment a kind of of the utility model; The difference of itself and embodiment shown in Figure 3 is; Between refrigeratory 13 and oxygen analyzer 14, also be provided with filtrator 19; Be used for further removing the dust of kind gas, get into more cleaning of appearance gas in the oxygen analyzer 14, guarantee that oxygen analyzer 14 can accurately stable work thereby make.Preferably, the filtering accuracy of said filtrator 19 is the 6-10 micron, so that remove the dust of denier in the appearance gas.Further, said filtrator 19 is two groups of parallel connection, two groups of blocked operations during work, and one opens one closes.
Fig. 5 shows a kind of further preferred embodiment of the utility model, and the difference of itself and embodiment shown in Figure 4 is, also is provided with buffering water pot 16 and nitrogen blowback lines 18 in this system.Said buffering water pot 16 is used to store sewage, reduces the sewage discharge number of times.Said nitrogen blowback lines 18 is used for regularly sample lines being carried out blowback, to avoid in the sample lines because condensing of steam causes coal dust and water to mix the obstruction sample lines.
Wherein, Said buffering water pot 16 connects water seal washing tank 12 through pipeline 23; Said pipeline 23 is arranged in water seal washing tank 12 liquid levels below with the tie point of water seal washing tank 12, and when liquid level in the water seal washing tank exceeded pipeline 23 and cushions the tie point of water pot 16, washings can overflow to buffering water pot 16; With the liquid level in the maintenance water seal washing tank 12, thereby make kind gas keep constant basically through the resistance of detection system.In addition, said buffering water pot 16 also can connect the tube side and the shell side of condenser 13 bottoms respectively, to get rid of the hydrops in condenser 13 bottom tube sides and the shell side.In addition, also be provided with drainpipe, when buffering water pot 16 middle water levels are higher, can discharge the sewage in the buffering water pot 16 in the bottom of buffering water pot 16.Preferably, the solenoid valve V4 of PLC control is set, with automatic sewage effluent on the drainpipe of buffering water pot 16.
One end of said blowback lines 18 connects the sampling pipeline between dedusting tank 17 and water seal washing tank 12, and its other end connects nitrogen supply (NS) pipeline (not shown), through nitrogen sample lines is carried out blowback.Further; Said nitrogen blowback and the draining of buffered water jar can be adopted 22 controls of PLC electromagnetic valve group controller jointly; For example, said electromagnetic valve group comprises the solenoid valve V4 on the drainpipe of solenoid valve V3 and buffered water jar 16 bottoms on the T-valve V1, the solenoid valve V2 on the anti-blowpipe, refrigeratory 13 discharge pipes of blowback lines 18 and sampling pipe junction.In the production, nitrogen blowback and timing drainage generally can be set at 24 hours, blowback 15 seconds, draining 3 seconds.Solenoid valve V2 opens during the nitrogen blowback, and V3 closes, a side of V1 T-valve tangential dedusting tank 17, and nitrogen is through blowback lines 18 blowback 15 seconds in system, and solenoid valve V4 opened 3 seconds simultaneously, discharged the water in the buffering water pot 16.After blowback and draining were accomplished, solenoid valve automatically restored to a kind gas disposal state, carries out a kind gas disposal.Certainly, concrete parameter setting can also be adjusted according to actual condition accordingly.
In addition; Owing to during oxygen analyzer 14 work the gas flow that flows into analyser is had certain area requirement (0.5-1.5L/min); And need the response time (generally requiring) faster during system works less than 30 seconds; Accelerating the processing renewal speed of appearance gas, this need the increase system in the flow of appearance gas.Preferably; Set up the by-pass 20 of oxygen analyzer 14; And by-pass 20 preferably all is equipped with spinner-type flowmeter with oxygen analyzer 14 inlets; Through the flow of appearance gas in the adjustment by-pass 20, guarantee that oxygen analyzer 14 inlet appearance airsheds are in the claimed range, the response time of total system can obtain divided by the appearance airshed through system volume.
Below the response time of the preferred implementation of the utility model shown in Fig. 5 is calculated.
Consider that the sample sampling spot is little negative pressure system; And Venturi tube injection negative pressure is also very little; Appearance gas is from being sampled to the close of analyser; Ignore the state variation of kind gas in system, sample is the response time of system from sampling spot to the Venturi tube transmission time, so the volume of appearance gas disposal flow process is the response time principal element that influences detection system in the total system.
Wherein, the dedusting tank volume is 0.5L, the volume 1.0L of water seal washing tank; All to adopt external diameter be that 6mm, thickness of pipe are the stainless-steel tube of 1mm to taking off sample line the flow container from sampling probe; Length of pipeline is approximately 20 meters, and then the volume of systematic pipeline (unit is L, keeps 2 significant digits) is:
3.14×0.0022×20×1000L≈0.25L，
Filtrator, refrigeratory and other volume are approximately 0.1L,
Volume V=(0.5+1.0+0.25+0.1) L=1.85L of appearance gas disposal flow process in the system then.
Adjustment by-pass flow is 8.0L/min, and the flow of inlet instrument is 1.0L/min, and then whole injection flow is 9.0L/min.
Hence one can see that, and the response time of system is: 1.85 ÷, 9.0 * 60S=12.3S, less than 30S, the system after promptly improving satisfies the requirement to the response time.
For the operating position of instrument after the verification system transformation, below describe through specific embodiment and Comparative Examples preferred implementation to the utility model shown in Fig. 5.
In the actual production, the performance index that oxygen analyzer is required are following:
Range: 0-15vol%
Measuring error:＜0.5%
Zero point drift:＜0.05%/week
Span drift:＜0.05%/week
In following examples and the Comparative Examples; Calibrating gas is by the general helium production of standardization material professional production merchant north gas; Nil norm gas is 99.99% nitrogen; Range standard gas is the combination gas (more than be percent by volume, data also are percent by volume in the following table) of oxygen content 15.00%, nitrogen content 85.00%.
Embodiment one
Regularly use calibrating gas that oxygen analyzer is carried out zero point and range designation, concrete experimental data is seen table 1,
Table 1 uses standard gas that system is improved the zero point of back instrument and the result of range designation
Instrument is carried out the demarcation of zero point and range week about, the description of test that accumulative total is four groups, and the data accuracy of instrumental analysis is high, satisfies zero point drift and range drift less than 0.05%/all performance index, need not to carry out the adjustment of zero point and range.From the instrument principle analysis; The subsidiary dust of measuring media is attached on the sensor being the one of the main reasons that causes instrument zero point and span drift; This explanation appearance gas cleanliness factor after system handles is high, thereby does not cause the zero point drift and the ultra instrument qualification of range drift of instrument.
Comparative Examples one
In order better to embody the beneficial effect of the utility model, before the system that at present provides improves, use calibrating gas that oxygen analyzer is carried out the result of zero point and range designation week about, specifically experimental data is seen table 2,
The manual analysis of appearance gas and the correlation data of instrumental analysis before table 2 system improves
Can be found out that by table 2 before system improved, zero point, the span drift of instrument were 3.0% to the maximum, minimum is 1.0%, can not satisfy zero point drift and the range drift performance index less than 0.05%/week.Because zero point, span drift are serious, need reference standard appearance gas constantly to adjust the instrument potentiometer and demarcate, but adjusting number of times too much possibly damage gauge sensor.
Embodiment two
After the verification system transformation, the effect of oxygen analyzer when actual analysis pulverized coal system appearance gas week about, carries out instrument on-line analysis and manual analysis to appearance gas respectively in a period of time, and concrete data are seen table 3,
Table 3 system improves the manual analysis of back appearance gas and the correlation data of instrumental analysis
Visible by table 2; The numerical value consistance of actual on-line analysis of instrument and manual analysis is relatively good, and (data of manual analysis keep 3 position effective digitals; The instrument site-test analysis is to keep 2 position effective digitals), the analysis result that illustrative system improves the back instrument satisfies error less than 0.5 requirement.
Comparative Examples two
System carries out instrument on-line analysis and manual analysis to appearance gas respectively before improving week about in a period of time, concrete data are seen table 4,
The manual analysis of appearance gas and the correlation data of instrumental analysis before table 4 system improves
Can be found out that by table 4 before system improved, instrument on-line analysis and manual analysis deviation were big, maximum deviation reaches 1.5, and the analysis result of instrument can not satisfy error less than 0.5 requirement, and the instrument indication is forbidden.
Claims (8)
1. the appearance gas disposal detection system of an on-line analysis instrument is characterized in that, comprising:
Sampling valve, said sampling valve one end connects pulverized coal system;
The water seal washing tank connects the sampling valve other end, and washing is from the appearance gas of said sampling valve;
The appearance gas that refrigeratory, Quench are drawn from said water seal washing tank top, and remove the moisture in kind gas;
The oxygen content of the appearance gas that oxygen analyzer, analysis are drawn from said refrigeratory top;
Venturi tube connects the outlet of said oxygen analyzer, is the mobile power that provides of appearance gas in the whole detection system.
2. detection system as claimed in claim 1 is characterized in that, between said sampling valve and water seal washing tank, also is provided with dedusting tank.
3. detection system as claimed in claim 2 is characterized in that, between refrigeratory and oxygen analyzer, also is provided with filtrator.
4. detection system as claimed in claim 3 is characterized in that, also comprises the buffering water pot, and said buffering water pot is connected through pipeline with the bottom of water seal washing tank and refrigeratory.
5. detection system as claimed in claim 4; It is characterized in that; On the sampling pipeline between dedusting tank and the water seal washing tank, also be provided with blowback lines, the other end of said blowback lines is connected on the nitrogen pipeline, is used for that the sampling pipeline is carried out blowback and prevents that pipeline from stopping up.
6. detection system as claimed in claim 5 is characterized in that, has also set up the oxygen analyzer by-pass at the two ends of oxygen analyzer, and by-pass and oxygen analyzer inlet all is provided with spinner-type flowmeter.
7. like any described detection system among the claim 1-6, it is characterized in that the tank body of said water seal washing tank is the transparent material preparation.
8. detection system as claimed in claim 3 is characterized in that, said filtrator filtering accuracy is the 6-10 micron, further to remove the coal dust in kind gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120456819 CN202453232U (en) | 2011-11-17 | 2011-11-17 | Sample gas processing detecting system of online analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120456819 CN202453232U (en) | 2011-11-17 | 2011-11-17 | Sample gas processing detecting system of online analyzer |
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| CN202453232U true CN202453232U (en) | 2012-09-26 |
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| CN 201120456819 Expired - Lifetime CN202453232U (en) | 2011-11-17 | 2011-11-17 | Sample gas processing detecting system of online analyzer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494927A (en) * | 2011-11-17 | 2012-06-13 | 神华集团有限责任公司 | Sample gas processing detection system and method for on-line analysis meter |
| CN106706739A (en) * | 2017-03-01 | 2017-05-24 | 武汉立为工程技术有限公司 | Absorption tower pH and density measuring device for preventing blocking with rinsing water |
| CN106872225A (en) * | 2015-12-10 | 2017-06-20 | 中国科学院大连化学物理研究所 | A kind of water sample pretreatment device and its application method |
-
2011
- 2011-11-17 CN CN 201120456819 patent/CN202453232U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494927A (en) * | 2011-11-17 | 2012-06-13 | 神华集团有限责任公司 | Sample gas processing detection system and method for on-line analysis meter |
| CN102494927B (en) * | 2011-11-17 | 2013-09-18 | 神华集团有限责任公司 | Sample gas processing detection system and method for on-line analysis meter |
| CN106872225A (en) * | 2015-12-10 | 2017-06-20 | 中国科学院大连化学物理研究所 | A kind of water sample pretreatment device and its application method |
| CN106706739A (en) * | 2017-03-01 | 2017-05-24 | 武汉立为工程技术有限公司 | Absorption tower pH and density measuring device for preventing blocking with rinsing water |
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Granted publication date: 20120926 |