CN114739858A - System and method for detecting content of tar and ash in gas - Google Patents

System and method for detecting content of tar and ash in gas Download PDF

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Publication number
CN114739858A
CN114739858A CN202210451739.9A CN202210451739A CN114739858A CN 114739858 A CN114739858 A CN 114739858A CN 202210451739 A CN202210451739 A CN 202210451739A CN 114739858 A CN114739858 A CN 114739858A
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sampler
gas
tar
heating well
pipeline
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凌约涛
罗琼
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/34—Purifying; Cleaning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
    • G01N31/168—Determining water content by using Karl Fischer reagent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
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  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
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  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention provides a system and a method for detecting tar and ash content in gas, wherein the system comprises a gas sampler, a gas supply device, a moisture evaporation and purging detection device, a tar elution and drying device and a weighing device; the gas sampler comprises a first sampler and a second sampler; the moisture evaporation and blowing detection device comprises a first heating well and a Karl Fischer moisture tester, wherein a first sampler is arranged in the first heating well; the gas supply device is communicated with the first sampler, and the first sampler is communicated with a detection pool of the Karl Fischer moisture tester; the tar elution drying device comprises an elution liquid bottle and a second heating well, and a second sampler is arranged in the second heating well; the gas supply device and the eluent bottle are respectively communicated with the second sampler; the weighing device is used for detecting the mass of the first sampler and the second sampler. The invention has simple structure, high detection sensitivity and high speed, and is convenient for accurately detecting the content of moisture, tar and ash in the target gas intercepted by the gas sampler.

Description

System and method for detecting content of tar and ash in gas
Technical Field
The invention relates to the technical field of gas component detection, in particular to a system and a method for detecting tar and ash content in gas.
Background
In the gas generated in the process of fuel combustion and coal coking, a certain amount of tar is usually generated. Tar is an important chemical raw material, and if the tar is directly discharged, the tar not only pollutes the environment, but also wastes resources. Due to the environmental protection and the resource recycling, the electric catcher is used for catching and recycling tar in the smoke. The monitoring of the tar and the dust in the discharged gas treated by the electric catcher not only is an evaluation index of the performance of the electric catcher for catching the tar, but also can optimize the operation parameters of the electric catcher in real time to improve the efficiency of catching the tar.
In the related technology, a filter membrane method is mainly adopted for detecting the tar content in the gas. The filtering method is that after a certain volume of gas passes through a sampler provided with a filtering device (a glass fiber filtering membrane or a filtering cylinder) which is dried, the gas is dried again for a constant weight, and then the tar content is calculated according to the increment of the filtering device and the sampling volume of the gas to be measured.
However, tar intercepted by the filtering membrane contains volatile components, so that a dryer filled with allochroic silica gel is mostly adopted to dry the filtering membrane or the sampler for constant weight, the method needs longer time, the time needed by secondary drying is at least more than 30 hours, and the efficiency is very low. Meanwhile, in the detection process, the influence of ash in the gas on the detection result is not considered, so that the total content of tar and ash is obtained based on a filter membrane method, and tar and dust cannot be respectively subjected to quantitative analysis.
Disclosure of Invention
The invention provides a system and a method for detecting tar and ash content in gas, which are used for solving the problems that the detection efficiency of the current detection mode of tar in gas components based on a filter membrane method or a filter cartridge method is low, and tar and dust in gas are difficult to be quantitatively analyzed respectively.
The invention provides a system for detecting the content of tar and ash in gas, which comprises: the device comprises a gas sampler, a gas supply device, a moisture evaporation and purging detection device, a tar elution and drying device and a weighing device;
the gas sampler comprises a first sampler for performing primary sampling on target gas and a second sampler obtained after moisture in the first sampler is removed;
the moisture evaporation and blowing detection device comprises a first heating well and a Karl Fischer moisture tester; the first heating well is used for installing the first sampler and heating the first sampler; the gas supply device is used for conveying purge gas subjected to drying and dust removal treatment into the first sampler, moisture in the first sampler is converted into water vapor under the heating of the first heating well, and the water vapor is purged to a detection cell of the Karl Fischer moisture tester by the purge gas;
the tar elution drying device comprises an elution liquid bottle and a second heating well, and the second heating well is used for installing the second sampler and heating the second sampler; the eluent bottle is used for introducing an eluent into the second sampler, and the eluent is heated by the second heating well to accelerate dissolution of tar in the second sampler; the gas supply device is also used for conveying purge gas into the second sampler after tar elution treatment so as to remove water and residual eluent in the second sampler under the heating of the second heating well;
the weighing device is used for detecting the mass of the first sampler and the second sampler.
The invention provides a system for detecting the content of tar and ash in gas, wherein a gas supply device comprises a first pipeline, a purification device and a first preheating pipe;
the purification device is arranged on the first pipeline, and one end of the first pipeline can be selectively communicated with one end of the first preheating pipe; at least part of the pipe section of the first preheating pipe is attached to the outer wall of the first heating well so as to absorb the heat energy of the outer wall of the first heating well; the other end of the first preheating pipe is communicated with the gas outlet end of the first sampler, and the gas inlet end of the first sampler is communicated with the detection pool of the Karl Fischer moisture tester;
wherein, purifier is used for getting rid of the moisture and the solid impurity that get into in the first pipeline.
The invention provides a system for detecting the content of tar and ash in gas, wherein the gas inlet end of a first sampler is communicated with one end of a second pipeline, and the other end of the second pipeline extends into a detection pool of a Karl Fischer moisture tester;
and the outer wall of at least part of the pipe section of the second pipeline is attached to the heat tracing device.
The invention provides a system for detecting the content of tar and ash in gas, wherein a gas pumping device is arranged on a first pipeline;
and/or the purification device comprises at least one group of dryers and at least one group of filters which are arranged on the first pipeline.
The invention provides a system for detecting the content of tar and ash in gas, wherein the tar eluting and drying device further comprises a peristaltic pump;
the elution liquid bottle is communicated with one end of a third pipeline, the other end of the third pipeline is communicated with the air inlet end of the second sampler, and the peristaltic pump is arranged on the third pipeline;
the gas inlet end of the second sampler extends out of the top of the second heating well, the gas outlet end of the second sampler extends out of the bottom of the second heating well, and an eluent used for eluting tar is filled in the eluent bottle.
The invention provides a system for detecting the content of tar and ash in gas, wherein the gas outlet end of a second sampler is communicated with a waste liquid bottle through a fourth pipeline, and the fourth pipeline is provided with a control valve.
The invention provides a system for detecting the content of tar and ash in gas, wherein one end of a first pipeline can be selectively communicated with one end of a second preheating pipe; at least part of the pipe section of the second preheating pipe is attached to the outer wall of the second heating well so as to absorb the heat energy of the outer wall of the second heating well; the other end of the second preheating pipe is communicated with the gas inlet end of the second sampler.
The invention provides a system for detecting the content of tar and ash in gas, wherein the other end of a peristaltic pump is communicated with the gas inlet end of a second sampler through a first one-way valve, and the first one-way valve is arranged on a third pipeline and is used for controlling eluent output by the peristaltic pump to be directionally conveyed into the second sampler;
and a second one-way valve is arranged on the second preheating pipe and used for controlling the gas in the second preheating pipe to be directionally conveyed into the second sampler.
The invention provides a system for detecting the content of tar and ash in gas, wherein 1 or more than one moisture evaporation purging detection device and one tar eluting and drying device can be arranged, and a first heating well and a second heating well are vertically distributed;
and/or the other end of the first preheating pipe is communicated with the gas outlet end of the first sampler through a second sealed quick coupling, and the gas inlet end of the first sampler is communicated with one end of the second pipeline through a first sealed quick coupling; the first sealing quick connector and the second sealing quick connector are arranged in an up-down opposite mode along the central axis of the first heating well, the second sealing quick connector is positioned on the central axis at the bottom of the first heating well, and the first sealing quick connector is movably arranged on the central axis above the well mouth of the first heating well;
the other end of the second preheating pipe and the other end of the third pipeline are communicated with the gas inlet end of the second sampler through a third sealed quick coupling together, the gas outlet end of the second sampler is communicated with one end of a fourth pipeline through a fourth sealed quick coupling, and the other end of the fourth pipeline is communicated with a waste liquid bottle; the third sealing quick connector and the fourth sealing quick connector are arranged in an up-down opposite mode along the central axis of the second heating well, the fourth sealing quick connector is located on the central axis of the bottom of the second heating well, and the third sealing quick connector is movably arranged on the central axis above the well mouth of the second heating well.
The invention also provides a detection method of the system for detecting the content of tar and ash in the gas, which comprises the following steps:
acquiring a first mass of a gas sampler after drying treatment and a second mass of the gas sampler after sampling a target gas with a preset volume after drying treatment;
under the condition that a first sampler after sampling target gas is installed in a first heating well, water in the first sampler is converted into steam under the heating of the first heating well, purge gas subjected to drying and dust removal treatment is conveyed into the first sampler through a gas supply device, the steam in the first sampler is purged to a measuring pool of a Karl Fischer moisture tester, and third mass of moisture in the first sampler is obtained through the Karl Fischer moisture tester;
under the condition that the second sampler is installed in the second heating well, under the heating of the second heating well, firstly, eluting tar in the second sampler by using an eluent for at least three times, and then, conveying a purging gas into the second sampler through a gas supply device until the second sampler completing the elution of the tar reaches a dry state, so as to obtain the fourth mass of the second sampler completing the elution of the tar after drying;
and acquiring the contents of moisture, tar and ash in the target gas intercepted by the gas sampler according to the first mass, the second mass, the third mass, the fourth mass and the volume of the sampled target gas, and calculating the contents of tar and dust in the sampled gas.
According to the system and the method for detecting the content of tar and ash in the gas, provided by the invention, the gas sampler, the gas supply device, the moisture evaporation purging detection device, the tar elution drying device and the weighing device are arranged, so that the moisture in the first sampler can be converted into water vapor under the heating of the first heating well, and the water vapor is purged to the detection pool of the Karl Fischer moisture tester through the dried purging gas, so that the accurate detection of the content of the water intercepted in the sampler can be efficiently realized; further, tar elution and drying are sequentially carried out on the second sampler, the quality of the second sampler after drying of the tar elution is obtained, and then the moisture content in the target gas intercepted by the gas sampler is combined, so that the content of tar and ash in the target gas is quantitatively obtained.
Based on the detection system disclosed by the invention, in practical application, the detection time of the moisture content in the gas sampler is not more than 10 minutes in general, and the time for carrying out tar elution and drying on the gas sampler is not more than 50 minutes, so that the detection efficiency is higher.
Therefore, the system disclosed by the invention is simple in structure and high in detection efficiency, and is convenient for accurately detecting the contents of moisture, tar and ash in the target gas intercepted by the gas sampler.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a gas sampler for sampling a target gas according to the present invention;
FIG. 2 is a schematic cross-sectional view of a cartridge gas sampler provided in the present invention;
FIG. 3 is a schematic structural diagram of a system for detecting tar and ash content in a gas provided by the present invention;
FIG. 4 is a schematic flow chart of the detection method based on tar and ash content in gas provided by the invention.
Reference numerals:
101: a gas flow channel; 102: a first sampling tube; 103: a gas sampler; 104: a second sampling tube; 105: a wet gas flow meter; 106: a sampling valve; 111: a first housing; 112: a second housing shell; 113: a filter element; 1: a primary air filter; 2: a diaphragm pump; 3: a primary drying bottle; 4: a secondary drying bottle; 5: a secondary air filter; 6: a three-way valve; 7: a first gas flow meter; 8: a first preheating pipe; 9: a first heater well; 10: a second sealed quick connector; 11: a first sampler; 12: a first sealed quick connector; 13: a heat tracing device; 14: a detection cell; 15: a Karl Fischer moisture detector host; 16: a second gas flow meter; 17: a second preheating pipe; 18: a second heater well; 19: a second sampler; 20: a second one-way valve; 21: a third sealed quick connector; 22: a first check valve; 23: a peristaltic pump; 24: an eluent bottle; 25: a fourth sealed quick connector; 26: a normally closed solenoid valve; 27: a waste liquid bottle; 28: a first pipeline; 29: a second pipeline; 30: a third pipeline; 31: a fourth pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The following describes a system and a method for detecting tar and ash content in gas according to the present invention with reference to fig. 1 to 4.
As shown in fig. 1 to 3, the present embodiment provides a system for detecting tar and ash content in a gas, including: the device comprises a gas sampler, a gas supply device, a moisture evaporation purging detection device, a tar elution drying device and a weighing device.
As shown in fig. 1, when the gas sampler 103 is used to sample the target gas, in this embodiment, one end of the first sampling tube 102 extends into the gas channel 101 where the target gas is located, and the other end of the first sampling tube 102 is communicated with the gas inlet end of the gas sampler 103. Meanwhile, the gas outlet end of the gas sampler 103 is connected to one end of a second sampling tube 104, and the other end of the second sampling tube 104 is connected to a wet gas flowmeter 105.
A sampling valve 106 is installed on the second sampling pipe 104, the sampling valve 106 is used for adjusting the flow rate of the sampled target gas, and the wet gas flowmeter 105 is used for detecting the flow rate of the target gas. Here, by controlling the sampling time, sampling of a preset volume of the target gas may be accomplished based on the gas sampler 103.
As shown in fig. 2, the gas sampler 103 shown in this embodiment includes a first shell 111 and a second shell 112, a cover opening end of the first shell 111 is hermetically connected to a cover opening end of the second shell 112, the first shell 111 is provided with a gas inlet, and the second shell 112 is provided with a gas outlet. Wherein, the gas inlet is used as the gas inlet end of the gas sampler 103, and the gas outlet is used as the gas outlet end of the gas sampler 103.
Meanwhile, an accommodating chamber is formed between the first housing 111 and the second housing 112, and the filter element 113 is accommodated in the accommodating chamber. The filter element 113 may be a filter membrane or a filter cartridge. In the case where the filter element 113 is a filter cartridge, the gas sampler 103 of the present embodiment is a cartridge filter, and the open end of the filter cartridge faces the gas inlet on the first housing 111. The gas sampler 103 shown in this embodiment can withstand high temperatures of at least 300 ℃ without moisture release.
For the following description, the gas sampler of the present embodiment specifically includes a first sampler 11 for performing a first sampling of the target gas and a second sampler 19 for removing moisture from the first sampler 11.
It should be noted that, when the gas sampler is used for gas sampling, the gas sampler is ensured to be in a dry and constant-weight state so as to ensure the accuracy of the subsequent detection result.
Further, as shown in fig. 3, the moisture evaporation and purging detection device includes a first heating well 9 and a karl fischer moisture meter, which includes a host 15 and a detection cell 14. The first heating well 9 is used for installing a first sampler 11; the gas supply device is used for conveying the purging gas subjected to drying and dust removal treatment into the first sampler 11, the moisture in the first sampler 11 is converted into water vapor under the heating of the first heating well 9, and the water vapor is purged into the detection cell 14 of the Karl Fischer moisture tester by the purging gas.
The tar elution drying device comprises an elution liquid bottle 24 and a second heating well 18, wherein the second heating well 18 is used for installing a second sampler 19 and heating the second sampler 19. The eluent used for eluting tar is filled in the eluent bottle 24, the eluent in the eluent bottle 24 is quantitatively input into the second sampler 19 through a peristaltic pump, the eluent is heated by the second heating well 18 to dissolve the tar attached in the second sampler 19 in an accelerated manner, then the normally closed electromagnetic valve 26 is opened to discharge the tar into the waste liquid bottle 27, and the steps are repeated for at least 3 times to achieve the purpose of eluting the tar; under the heating of the second heating well 18, the gas supply device is also used for conveying the purge gas after the drying and dedusting treatment into the second sampler 19 after the tar elution treatment, so as to remove the water and the residual eluent in the second sampler 19.
The weighing device is used to check the mass of the first sampler 11 and the mass of the second sampler 19 before and after tar elution. The weighing device shown in this example is preferably an analytical balance, which has an accuracy of 0.1 mg.
Specifically, in the embodiment, by arranging the gas sampler, the gas supply device, the moisture evaporation purging detection device, the tar elution drying device and the weighing device, moisture in the first sampler 11 can be converted into water vapor under the heating of the first heating well 9, and the water vapor is purged to the detection cell 14 of the karl fischer moisture determinator by the dry purging gas, so as to efficiently and accurately detect the moisture content intercepted by the first sampler 11; further, the second sampler 19 is sequentially subjected to tar elution and drying to obtain the quality of the second sampler 19 after drying, and the moisture content in the first sampler 11 is combined to quantitatively obtain the tar and ash content in the target gas captured by the gas sampler.
In general, the detection time of the moisture content in the gas sampler is not more than 10 minutes, and the time for eluting and drying the tar in the gas sampler is not more than 50 minutes, so that the gas sampler has higher detection efficiency.
Therefore, the system shown in the embodiment has a simple structure and high detection efficiency, and is convenient for accurately detecting the content of moisture, tar and ash in the target gas intercepted by the gas sampler.
In some embodiments, due to the large number of samples, in order to further improve the detection efficiency, one or more moisture evaporation purging detection devices and one or more tar elution drying devices may be respectively provided in the present embodiment, so as to implement different detection processes for the target gas at the same time.
As shown in fig. 3, in each moisture evaporation purge detection device and each tar elution drying device, the first heater well 9 and the second heater well 18 are vertically distributed. In practical operation, the heating temperatures of the first heating well 9 and the second heating well 18 can be set to 105-. A heating cavity which is communicated up and down is formed between the upper well mouth and the lower well mouth of the first heating well 9.
The lower end of the first heating well 9 may be flat-bottomed or funnel-shaped, and the lower end is determined according to the shape of the gas sampler, so that the outer wall surface of the gas sampler and the inner wall surface of the heating cavity are in good contact.
Here, in order to ensure the drying effect of the moisture in the first sampler 11, the outer wall surface of the first sampler 11 is configured to contact the inner wall of the first heating well 9, the gas outlet end of the first sampler 11 extends from the bottom of the first heating well 9, and the gas inlet end of the first sampler 11 extends from the top of the first heating well 9. After absorbing heat from the first heating well 9, the purge gas thus dried and purified is supplied from the bottom of the first heating well 9 into the first sampler 11, and the water vapor in the first sampler 11 is discharged from the inlet end of the first sampler 11 by purging the purge gas and purged into the detection cell 14 of the karl fischer moisture meter.
Accordingly, in order to facilitate elution of tar adhering to the inside of the second sampler 19 and drying of moisture in the second sampler 19, the second sampler 19 is disposed such that the outer wall of the second sampler 19 contacts the inner wall of the second heating well 18, the gas inlet end of the second sampler 19 extends from the top of the second heating well 18, and the gas outlet end of the second sampler 19 extends from the bottom of the second heating well 18. In this way, when the tar in the second sampler 19 is eluted, the eluted waste liquid can be automatically discharged from the gas outlet end of the second sampler 19 under the action of gas pressure and gravity.
In some embodiments, in order to ensure that the gas supply device can deliver dry and purified purge gas to the first sampler 11 and the second sampler 19, respectively, the gas supply device shown in this embodiment comprises a first pipeline 28, a purification device and a first preheating pipe 8.
The purification device is arranged on a first pipeline 28, and one end of the first pipeline 28 can be selectively communicated with one end of the first preheating pipe 8; at least part of the first preheating pipe 8 is attached to the outer wall of the first heating well 9 so as to absorb the heat energy of the outer wall of the first heating well 9; the other end of the first preheating pipe 8 is communicated with the air outlet end of the first sampler 11 in a detachable connection mode, the air inlet end of the first sampler 11 is communicated with one end of the second pipeline 29 in a detachable connection mode, and the other end of the second pipeline 29 extends to a position below the liquid level in the detection cell 14 of the Karl Fischer moisture tester.
Wherein the purification device is used to remove moisture and solid impurities that enter the first conduit 28.
As shown in fig. 3, a gas pumping device, which may be a diaphragm pump 2 as is well known in the art, is mounted on the first conduit 28.
At the same time, the purification device comprises at least one set of dryer and at least one set of filter arranged on the first pipe 28.
Specifically, the dryer may be a drying bottle containing a drying agent, for example, the dryer includes a primary drying bottle 3 and a secondary drying bottle 4. Meanwhile, the filter includes a primary air filter 1 and a secondary air filter 5.
Based on the above setting, according to the pumping action of diaphragm pump 2 to gas, air in the environment is after the filtration treatment of one-level air cleaner 1, get into the drier of one-level drying bottle 3 through diaphragm pump 2, the gas in the one-level drying bottle 3 reentries into the drier of second grade drying bottle 4, then, the gas in the second grade drying bottle 4 is after second grade air cleaner 5, the gas of second grade air cleaner 5 output is imported from the first end of three-way valve 6 to export from the second end of three-way valve 6, then, carry to first preheating pipe 8 in through first gas flowmeter 7.
As shown in fig. 3, the first preheating pipe 8 shown in this embodiment is preferably a heat conducting pipe, for example, the heat conducting pipe is a heat conducting copper pipe, the first preheating pipe 8 is coiled on the outer wall of the first heating well 9 in a spiral arrangement, and extends from top to bottom from the outer wall of the first heating well 9, so that the first preheating pipe 8 can sufficiently absorb the heat energy on the first heating well 9 to heat the purge gas in the first preheating pipe 8. Of course, this embodiment may also provide that a part of the first preheating pipe 8 is laid back and forth in the axial direction on the outer wall of the first heating well 9, so as to heat the purge gas in the first preheating pipe 8 by the heat of the first heating well 9.
In some embodiments, as shown in fig. 3, the present embodiment provides that the other end of the first preheating pipe 8 is communicated with the gas outlet end of the first sampler 11 through the second sealed quick coupling 10, and the gas inlet end of the first sampler 11 is communicated with one end of the second pipeline 29 through the first sealed quick coupling 12; the first sealed quick coupling 12 and the second sealed quick coupling 10 are arranged in an up-down opposite manner along the central axis of the first heating well 9, the second sealed quick coupling 10 is located on the central axis at the bottom of the first heating well 9, and the first sealed quick coupling 12 is movably arranged on the central axis above the wellhead of the first heating well 9.
During detection, the gas inlet end of the first sampler 11 is inserted into the first sealed quick coupling 12 to communicate with one end of the second pipeline 29, and then the first sampler 11 is inserted into the first heating well 9 and the gas outlet end of the first sampler 11 is inserted into the second sealed quick coupling 10 to communicate with the first preheating pipe 8.
Thus, after the first end and the second end of the control three-way valve 6 are communicated, under the monitoring of the first gas flowmeter 7, the dried and dedusted purge gas flows through the first preheating pipe 8, is preheated by the heating action of the outer wall of the first heating well 9, then enters the first sampler 11 from the second sealed quick joint 10 through the gas outlet end of the first sampler 11, the moisture in the first sampler 11 is gasified under the heating of the first heating well 9, and the water vapor in the first sampler 11 is output to the second pipeline 29 through the gas inlet end of the first sampler 11 under the purging of the purge gas; then, the water is sent to the detection cell 14 of the karl fischer moisture meter through the second pipe 29, and the moisture content is detected by the karl fischer moisture meter.
In order to prevent the water vapor from condensing on the second pipeline 29 and affecting the accuracy of the detection result, the heat tracing device 13 is disposed on at least a part of the outer wall of the second pipeline 29 in the present embodiment.
The heat tracing device 13 is preferably a heat tracing pipe, and the heat tracing pipe is sleeved on the outer wall of the second pipeline 29.
Based on the scheme of the above embodiment, the second sampler 19 is obtained after the moisture in the first sampler 11 is dried. In order to elute the tar in the second sampler 19, the present embodiment further elutes the tar based on the eluent in the eluent bottle 24.
As shown in fig. 3, the tar elution drying device shown in this embodiment further includes a peristaltic pump 23, and the peristaltic pump 23 is specifically a quantitative peristaltic pump; the eluent bottle 24 is filled with an eluent suitable for eluting tar. The eluent is an organic solvent with good solubility for tar, and the organic solvent can be any one of trichloromethane, benzene, xylene and ethanol. Here, trichloroethane is preferable as the eluent because trichloroethane has a good dissolving ability for tar and is not easily burnt or exploded.
In some embodiments, the elution liquid bottle 24 is disposed to communicate with one end of the third tube 30, the other end of the third tube 30 communicates with the air inlet of the second sampler, and the peristaltic pump 23 is installed on the third tube 30.
So, after starting peristaltic pump 23, peristaltic pump 23 can be with the eluant pump sending in the eluant bottle 24 to the second sampler 19 in to under the heating effect of second heater well 18, ensure to reach the abundant contact of tar that adheres to on the eluant of presetting the temperature and the filter core of second sampler 19, the dissolution of tar is accelerated, after the process is eluted many times, tar is separated from the filter core, the waste liquid of elution discharges to waste liquid bottle 27 in, final ash content remains on the filter core.
In some embodiments, this embodiment may also communicate the third end of the three-way valve 6 with one end of the second preheating pipe 17. Wherein, the third end of the three-way valve 6 is communicated with one end of a second gas flowmeter 16, and the other end of the second gas flowmeter 16 is communicated with one end of a second preheating pipe 17.
In this way, when the first end of the three-way valve 6 is connected to the third end, the amount of purge gas introduced into the second sampler 19 can be controlled through the second preheating pipe 17 under the monitoring of the flow rate of gas by the second gas flow meter 16.
In this embodiment, at least a part of the second preheating pipe 17 is attached to the outer wall of the second heating well 18 to absorb the heat energy of the second heating well 18; the other end of the second preheating pipe 17 is communicated with the gas inlet end of the second sampler 19 in a detachable connection mode.
The second preheating pipe 17 is preferably a heat conducting pipe, for example, the heat conducting pipe is a heat conducting copper pipe, the second preheating pipe 17 is coiled on the outer wall of the second heating well 18 in a spiral arrangement manner, and extends from the outer wall of the second heating well 18 from top to bottom, so that the second preheating pipe 17 can sufficiently absorb heat energy on the second heating well 18 to heat the purge gas in the second preheating pipe 17. Of course, this embodiment may also provide that a partial section of the second preheating pipe 17 is laid axially back and forth on the outer wall of the second heating well 18, so as to use the heat of the second heating well 18 to heat the purge gas in the second preheating pipe 17.
In this way, after the tar in the second sampler 19 is completely eluted, the second heating well 18 may be used to heat the second sampler 19, and the residual organic solvent and water in the filter element of the second sampler 19 may be quickly removed under the purging of the purging gas with a certain heat until the second sampler 19 reaches a constant weight.
It should be noted that the other end of the peristaltic pump 23 shown in this embodiment is communicated with the gas inlet end of the second sampler 19 through a first one-way valve 22, and the first one-way valve 22 is disposed on the third pipeline 30 and is used for controlling the eluent output by the peristaltic pump 23 to be directionally conveyed into the second sampler 19.
Meanwhile, in the present embodiment, a second check valve 20 is disposed on the second preheating pipe 17, and the second check valve 20 is used for controlling the gas in the second preheating pipe 17 to be directionally conveyed into the second sampler 19.
In addition, the outlet end of the second sampler shown in this embodiment is connected to the waste liquid bottle through a fourth pipe 31, and a control valve is installed on the fourth pipe 31, the control valve is in a closed state under normal conditions, and the control valve is used for controlling the remaining extraction, the discharge and the drying of the organic solvent in the second sampler 19. Wherein the control valve is preferably a normally closed solenoid valve 26 as is known in the art.
Here, as for the installation manner of the second probe 19 into the second heating well 18 in the present embodiment, the installation manner of the first probe 11 into the first heating well 9 may be referred to.
In some examples, the present embodiment may provide that the other end of the second preheating pipe 17 and the other end of the third pipe 30 are jointly communicated with the gas inlet end of the second sampler 19 through the third sealed quick coupling 21, the gas outlet end of the second sampler 19 is communicated with one end of the fourth pipe 31 through the fourth sealed quick coupling 25, and the other end of the fourth pipe 31 is communicated with the waste liquid bottle; the third sealed quick connector 21 and the fourth sealed quick connector 25 are arranged in an up-down opposite mode along the central axis of the second heating well 18, the fourth sealed quick connector 25 is located on the central axis of the bottom of the second heating well 18, and the third sealed quick connector 21 is movably arranged on the central axis above the wellhead of the second heating well 18.
In a specific operation, the other end of the second preheating pipe 17 and the other end of the third pipeline 30 may be jointly plugged into one end of the third sealed quick coupling 21, the gas inlet end of the second sampler 19 is plugged into the other end of the third sealed quick coupling 21, and then the second sampler 19 is inserted into the second heating well 18 from top to bottom until the gas outlet end of the second sampler 19 is plugged into the fourth sealed quick coupling 25, so that the gas outlet end of the second sampler 19 is communicated with one end of the fourth pipeline 31 through the fourth sealed quick coupling 25.
As shown in fig. 4, this embodiment further provides a detection method of the system for detecting tar and ash content in gas, which includes the following steps:
step 410, a first mass of the gas sampler after drying processing and a second mass of the gas sampler after sampling a target gas with a preset volume after drying processing are obtained.
And 420, under the condition that the first sampler after the target gas is sampled is installed in the first heating well, under the heating of the first heating well, water in the first sampler is converted into steam, the purging gas after drying and dust removal treatment is conveyed into the first sampler through the gas supply device, the steam in the first sampler is purged to a measuring cell of the Karl Fischer moisture tester, and a third mass of the moisture in the first sampler is obtained through the Karl Fischer moisture tester.
And 430, under the condition that the second sampler is installed in the second heating well, under the heating of the second heating well, firstly, eluting tar in the second sampler by using the eluent for at least three times, and then, conveying the purging gas into the second sampler by using the gas supply device until the second sampler completing the elution of the tar reaches a dry state, so as to obtain the fourth mass of the second sampler completing the elution of the tar after drying.
And step 440, acquiring the contents of moisture, tar and ash in the target gas intercepted by the gas sampler according to the first mass, the second mass, the third mass, the fourth mass and the volume of the sampled target gas.
Based on the above steps, the following operations can be referred to for the detection of the moisture, tar and ash content in the gas in the present embodiment:
1. drying and constant weight of the gas sampler: and installing the gas sampler in the first heating well, and completing corresponding pipeline connection. Then, controlling the heating of the first heating well to 105-200 ℃, starting a diaphragm pump, filtering air in the environment through a primary air filter, then entering the air into a drying agent of a primary drying bottle through the diaphragm pump, then entering the air in the primary drying bottle into a drying agent of a secondary drying bottle, and then after the air in the secondary drying bottle passes through a secondary air filter, conveying the air output by the secondary air filter into a first preheating pipe through a three-way valve and a first gas flowmeter in sequence; under the monitoring of the first gas flowmeter, dry and pure purge gas flows through the first preheating pipe, is preheated under the heating action of the first heating well, is input to the gas inlet end of the gas sampler from the lower end of the first sampler, moisture in the gas sampler is gasified under the action of the first heating well, and is purged by purge gas with a certain temperature through the second pipeline, when the gas sampler reaches a dry constant weight, an analytical balance is adopted to weigh an initial mass M1 of the gas sampler reaching the dry constant weight, and the initial mass M1 is the sum of the masses of a shell of the gas sampler and a filtering membrane or a filtering core.
2. Sampling: the gas sampler with the dry constant weight and the weighed mass is used for sampling the target gas, the sampling time and the sampling amount are determined according to the content of tar, moisture and dust in the target gas, and more gas samples are obtained as far as possible on the premise of ensuring that the gas sampler cannot penetrate through a filter membrane (or a filter barrel). The total mass M2 of the gas sampler after sampling was then weighed to the nearest 0.1mg using an analytical balance. The mass is the total mass of the raw gas sampler and the moisture, dust and tar captured by the raw gas sampler.
3. Detection of intercepted moisture: and (2) installing the first sampler which finishes the sampling of the target gas in the first heating well, controlling the gas supply device to convey purge gas into the first sampler corresponding to the first heating well according to the operation in the step (1) after the pipeline connection is finished, controlling the gas flow to be 50-300 ml/min and the purge time until the water vapor in the first sampler is completely purged into a measuring cell of a Karl Fischer moisture tester, and detecting the total moisture mass M3 in the first sampler.
4. And (3) detecting the quality of the dust: installing a second sampler obtained after water is taken out in a second heating well, setting the heating temperature of the second heating well to be close to the boiling point of the eluent after corresponding pipeline connection is completed, starting a peristaltic pump under the condition of ensuring that an electromagnetic valve is closed after the heating temperature of the second heating well is stable, pumping a preset amount of eluent into the second sampler so that the eluent is fully contacted with tar attached to the second sampler in a micro-boiling state, keeping the eluent in the second sampler for a preset time, opening the electromagnetic valve after the tar is fully dissolved, controlling preheated purging gas to be introduced into the second sampler, discharging the waste liquid into a waste liquid bottle, and repeating the steps for 3-6 times so that the tar in the second sampler is completely eluted and discharged.
And then, heating the second heating well to 105-200 ℃, continuously introducing dry preheated air into the second sampler, accelerating evaporation and elimination of residual moisture and eluent in the second sampler by using the dry preheated air until the weight of the second sampler is constant, and then obtaining the mass M4 of the second sampler by using balance weight, wherein the mass is the mass sum of the body of the second sampler and dust.
5. And (3) calculating: after sampling, the mass M5 of the tar, water and dust obtained by the gas sampler is M2-M1; the mass of the trapped moisture was M3; mass M6 ═ M4-M1 of the trapped dust; the mass of tar trapped, M7, M2-M3-M4. Here, since the sampling volume of the target gas is known, the contents of moisture, tar, and ash in the target gas captured by the gas sampler can be calculated.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A detection system for tar and ash content in gas is characterized by comprising: the device comprises a gas sampler, a gas supply device, a moisture evaporation and purging detection device, a tar elution and drying device and a weighing device;
the gas sampler comprises a first sampler for performing primary sampling on target gas and a second sampler obtained after moisture in the first sampler is removed;
the moisture evaporation and blowing detection device comprises a first heating well and a Karl Fischer moisture tester; the first heating well is used for installing the first sampler and heating the first sampler; the gas supply device is used for conveying purge gas subjected to drying and dust removal treatment into the first sampler, moisture in the first sampler is converted into water vapor under the heating of the first heating well, and the water vapor is purged into a detection pool of the Karl Fischer moisture tester by the purge gas;
the tar elution drying device comprises an elution liquid bottle and a second heating well, and the second heating well is used for installing the second sampler and heating the second sampler; the eluent bottle is used for introducing an eluent into the second sampler, and the eluent is heated by the second heating well to dissolve tar in the second sampler; the gas supply device is also used for conveying purge gas into the second sampler after tar elution treatment so as to remove water and residual eluent in the second sampler under the heating of the second heating well;
the weighing device is used for detecting the mass of the first sampler and the second sampler.
2. The system for detecting the content of tar and ash in gas according to claim 1, wherein the gas supply device comprises a first pipeline, a purification device and a first preheating pipe;
the purification device is arranged on the first pipeline, and one end of the first pipeline can be selectively communicated with one end of the first preheating pipe; at least part of the pipe section of the first preheating pipe is attached to the outer wall of the first heating well so as to absorb the heat energy of the outer wall of the first heating well; the other end of the first preheating pipe is communicated with the gas outlet end of the first sampler, and the gas inlet end of the first sampler is communicated with the detection pool of the Karl Fischer moisture tester;
wherein, purifier is used for getting rid of the moisture and the solid impurity that get into in the first pipeline.
3. The system for detecting the content of tar and ash in gas according to claim 2, wherein the gas inlet end of the first sampler is communicated with one end of a second pipeline, and the other end of the second pipeline extends into a detection pool of the Karl Fischer moisture tester;
and the outer wall of at least part of the pipe section of the second pipeline is attached to the heat tracing device.
4. The system for detecting the content of tar and ash in gas according to claim 2, wherein a gas pumping device is installed on the first pipeline;
and/or the purification device comprises at least one group of dryers and at least one group of filters which are arranged on the first pipeline.
5. The system for detecting the content of tar and ash in gas according to any one of claims 2 to 4, wherein said tar eluting and drying device further comprises a peristaltic pump;
the elution liquid bottle is communicated with one end of a third pipeline, the other end of the third pipeline is communicated with the air inlet end of the second sampler, and the peristaltic pump is arranged on the third pipeline;
the gas inlet end of the second sampler extends out of the top of the second heating well, the gas outlet end of the second sampler extends out of the bottom of the second heating well, and the elution liquid bottle is filled with elution liquid used for eluting tar.
6. The system for detecting the content of tar and ash in gas according to claim 5, wherein the gas outlet end of the second sampler is communicated with the waste liquid bottle through a fourth pipeline, and the fourth pipeline is provided with a control valve.
7. The system for detecting the content of tar and ash in gas according to claim 5, wherein one end of the first pipeline is selectively communicated with one end of the second preheating pipe; at least part of the pipe section of the second preheating pipe is attached to the outer wall of the second heating well so as to absorb the heat energy of the outer wall of the second heating well; the other end of the second preheating pipe is communicated with the gas inlet end of the second sampler.
8. The system for detecting the content of tar and ash in gas according to claim 7, wherein the other end of the peristaltic pump is communicated with the gas inlet end of the second sampler through a first one-way valve, and the first one-way valve is disposed on the third pipeline and is configured to control the eluent output by the peristaltic pump to be directionally conveyed into the second sampler;
and a second one-way valve is arranged on the second preheating pipe and used for controlling the gas in the second preheating pipe to be directionally conveyed into the second sampler.
9. The system for detecting the content of tar and ash in gas according to claim 7, wherein the moisture evaporation and purging detection device and the tar elution and drying device are one or more, and the first heating well and the second heating well are vertically distributed;
and/or the other end of the first preheating pipe is communicated with the gas outlet end of the first sampler through a second sealed quick coupling, and the gas inlet end of the first sampler is communicated with one end of the second pipeline through a first sealed quick coupling; the first sealing quick connector and the second sealing quick connector are arranged oppositely up and down along the central axis of the first heating well, the second sealing quick connector is positioned on the central axis of the bottom of the first heating well, and the first sealing quick connector is movably arranged on the central axis above the well mouth of the first heating well;
the other end of the second preheating pipe and the other end of the third pipeline are communicated with the gas inlet end of the second sampler through a third sealed quick coupling together, the gas outlet end of the second sampler is communicated with one end of a fourth pipeline through a fourth sealed quick coupling, and the other end of the fourth pipeline is communicated with a waste liquid bottle; the third sealing quick connector and the fourth sealing quick connector are arranged in an up-down opposite mode along the central axis of the second heating well, the fourth sealing quick connector is located on the central axis of the bottom of the second heating well, and the third sealing quick connector is movably arranged on the central axis above the well mouth of the second heating well.
10. A method for detecting the tar and ash content in the gas according to any one of claims 1 to 9, comprising:
acquiring a first mass of a gas sampler after drying treatment and a second mass of the gas sampler after sampling a target gas with a preset volume after drying treatment;
under the condition that a first sampler after sampling target gas is installed in a first heating well, water in the first sampler is converted into steam under the heating of the first heating well, purge gas subjected to drying and dust removal treatment is conveyed into the first sampler through a gas supply device, the steam in the first sampler is purged to a measuring pool of a Karl Fischer moisture tester, and third mass of moisture in the first sampler is obtained through the Karl Fischer moisture tester;
under the condition that the second sampler is installed in the second heating well, under the heating of the second heating well, firstly, eluting tar in the second sampler by using an eluent for at least three times, and then, conveying a purging gas into the second sampler through a gas supply device until the second sampler which finishes the elution of the tar reaches a dry state, so as to obtain the fourth mass of the dried second sampler which finishes the elution of the tar;
and acquiring the contents of moisture, tar and ash in the target gas intercepted by the gas sampler according to the first mass, the second mass, the third mass, the fourth mass and the volume of the sampled target gas.
CN202210451739.9A 2022-04-26 2022-04-26 System and method for detecting content of tar and ash in gas Pending CN114739858A (en)

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CN202210451739.9A CN114739858A (en) 2022-04-26 2022-04-26 System and method for detecting content of tar and ash in gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210451739.9A CN114739858A (en) 2022-04-26 2022-04-26 System and method for detecting content of tar and ash in gas

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