A system and method for detecting tar and ash content in gas

Abstract

The present invention provides a system and method for detecting the tar and ash content in gas. The system includes a gas sampler, an air supply device, a moisture evaporation and purge detection device, a tar elution and drying device, and a weighing device. The gas sampler includes a first sampler and a second sampler. The moisture evaporation and purge detection device includes a first heating well and a Karl Fischer moisture meter, with the first sampler installed in the first heating well. The air supply device is connected to the first sampler, which is connected to the detection cell of the Karl Fischer moisture meter. The tar elution and drying device includes an eluent bottle and a second heating well, with a second sampler installed in the second heating well. The air supply device and the eluent bottle are respectively connected to the second sampler. A weighing device is used to detect the mass of the first and second samplers. The present invention has a simple structure, high detection sensitivity, and fast speed, and facilitates accurate detection of the moisture, tar, and ash content in the target gas intercepted by the gas sampler.

Description

Technical Field

[0001] The present invention relates to the technical field of gas component detection, and in particular to a system and method for detecting tar and ash content in gas. Background Art

[0002] A certain amount of tar is typically produced in the gases generated during fuel combustion and coal coking. Tar is a vital chemical raw material, and its direct discharge not only pollutes the environment but also represents a waste of resources. For environmental protection and resource recycling, electric precipitators are used to capture and recover tar from flue gases. Monitoring the tar and dust in exhaust gases treated by electric precipitators not only serves as an evaluation indicator of the tar capture performance of the precipitator but also allows for real-time optimization of operating parameters to improve tar capture efficiency.

[0003] The membrane filter method is the primary method used to detect tar content in gases. This involves passing a certain volume of gas through a sampler equipped with a dried filter (glass fiber membrane or cartridge), followed by re-drying to a constant weight. The tar content is then calculated based on the added volume of the filter and the sampled volume of the gas being tested.

[0004] However, because the tar captured by the filter membrane contains volatile components, most methods use a dryer filled with color-changing silica gel to dry the filter membrane or sampler to a constant weight. This method is time-consuming, with secondary drying taking at least 30 hours, making it very inefficient. Furthermore, the impact of ash in the gas on the test results is not considered during the detection process. Consequently, the filter membrane method only obtains the total tar and ash content, but cannot quantitatively analyze the tar and dust separately. Summary of the Invention

[0005] The present invention provides a system and method for detecting the tar and ash content in gas, which is used to solve the problem that the current detection method of tar in gas components based on filter membrane method or filter cartridge method has low detection efficiency and is difficult to quantitatively analyze tar and dust in gas separately.

[0006] The present invention provides a detection system for tar and ash content in gas, comprising: a gas sampler, a gas supply device, a water evaporation and purge detection device, a tar elution and drying device, and a weighing device;

[0007] The gas sampler includes a first sampler for completing the initial sampling of the target gas and a second sampler obtained after removing the moisture in the first sampler;

[0008] The moisture evaporation and purge detection device includes a first heating well and a Karl Fischer moisture analyzer; the first heating well is used to install the first sampler and heat the first sampler; the gas supply device is used to deliver a purge gas that has been dried and dust-removed into the first sampler, and the moisture in the first sampler is converted into water vapor under the heating of the first heating well. The water vapor is purged by the purge gas into the detection cell of the Karl Fischer moisture analyzer;

[0009] The tar elution and drying device includes an eluent bottle and a second heating well. The second heating well is used to install the second sampler and heat the second sampler. The eluent bottle is used to pass eluent into the second sampler. The eluent accelerates the dissolution of tar in the second sampler under the heating of the second heating well. The gas supply device is also used to deliver purge gas to the second sampler after the tar elution treatment, so as to remove moisture and residual eluent in the second sampler under the heating of the second heating well.

[0010] The weighing device is used to detect the mass of the first sampler and the second sampler.

[0011] The present invention provides a system for detecting the content of tar and ash in gas, wherein the gas supply device comprises a first pipeline, a purification device and a first preheating tube;

[0012] The purification device is disposed on the first pipeline, one end of which is selectively connected to one end of the first preheating tube; at least a portion of the first preheating tube is in contact with the outer wall of the first heating well to absorb heat energy from the outer wall of the first heating well; the other end of the first preheating tube is connected to the air outlet of the first sampler, and the air inlet of the first sampler is connected to the detection cell of the Karl Fischer moisture analyzer;

[0013] The purification device is used to remove moisture and solid impurities entering the first pipeline.

[0014] The present invention provides a system for detecting the tar and ash content in gas, wherein the air inlet end of the first sampler is connected to one end of a second pipeline, and the other end of the second pipeline extends into the detection cell of the Karl Fischer moisture analyzer;

[0015] The outer wall of at least a portion of the second pipeline is in contact with the heating device.

[0016] The present invention provides a system for detecting the content of tar and ash in gas, wherein the first pipeline is equipped with a gas pumping device;

[0017] And / or, the purification device includes at least one set of dryers and at least one set of filters arranged on the first pipeline.

[0018] The present 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;

[0019] The eluent bottle is connected to one end of the third pipeline, the other end of the third pipeline is connected to the air inlet end of the second sampler, and the peristaltic pump is installed on the third pipeline;

[0020] The air inlet end of the second sampler extends from the top of the second heating well, the air outlet end of the second sampler extends from the bottom of the second heating well, and the eluent bottle contains eluent for eluting tar.

[0021] The present invention provides a detection system for tar and ash content in gas. The gas outlet end of the second sampler is connected to a waste liquid bottle through a fourth pipeline, and a control valve is installed on the fourth pipeline.

[0022] The present invention provides a detection system for the tar and ash content in gas, wherein one end of the first pipeline can be selectively connected to one end of the second preheating tube; at least part of the pipe section of the second preheating tube is in contact with the outer wall of the second heating well to absorb the heat energy of the outer wall of the second heating well; the other end of the second preheating tube is connected to the air inlet end of the second sampler.

[0023] The present invention provides a system for detecting the tar and ash content in gas, wherein the other end of the peristaltic pump is connected to the air inlet end of the second sampler through a first one-way valve, and the first one-way valve is provided on the third pipeline and is used to control the directionality of the eluent output by the peristaltic pump and to be delivered to the second sampler;

[0024] The second preheating tube is provided with a second one-way valve, and the second one-way valve is used to control the directionality of the gas in the second preheating tube to be transported to the second sampler.

[0025] The present invention provides a system for detecting the tar and ash content in gas, wherein the water evaporation and purge detection device and the tar elution and drying device can be provided with one or more devices, and the first heating well and the second heating well are vertically distributed;

[0026] And / or, the other end of the first preheating tube is connected to the air outlet end of the first sampler through a second sealing quick connector, and the air inlet end of the first sampler is connected to one end of the second pipeline through a first sealing quick connector; the first sealing quick connector and the second sealing quick connector are arranged opposite each other in an upper and lower position along the central axis of the first heating well, the second sealing quick connector is located 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 wellhead of the first heating well;

[0027] The other end of the second preheating tube and the other end of the third pipeline are connected to the air inlet end of the second sampler through a third sealing quick joint, and the air outlet end of the second sampler is connected to one end of the fourth pipeline through a fourth sealing quick joint, and the other end of the fourth pipeline is connected to the waste liquid bottle; the third sealing quick joint and the fourth sealing quick joint are arranged opposite to each other in the upper and lower directions along the central axis of the second heating well, the fourth sealing quick joint is located on the central axis of the bottom of the second heating well, and the third sealing quick joint is movably arranged on the central axis above the wellhead of the second heating well.

[0028] The present invention further provides a method for detecting the tar and ash content in gas as described in any one of the above items, comprising:

[0029] obtaining a first mass of the gas sampler after drying and a second mass of the dried gas sampler after sampling a preset volume of target gas;

[0030] When the first sampler after sampling the target gas is installed in the first heating well, the water in the first sampler is converted into water vapor under the heating of the first heating well. The purge gas that has been dried and dust-removed is delivered into the first sampler through the gas supply device, so that the water vapor in the first sampler is purged into the measuring cell of the Karl Fischer titrator. The third mass of the water in the first sampler is obtained by the Karl Fischer titrator.

[0031] When the second sampler is installed in the second heating well, under the heating of the second heating well, the tar in the second sampler is first eluted at least three times using an eluent, and then a purge gas is supplied to the second sampler through the gas supply device until the second sampler, from which the tar elution is completed, reaches a dry state, and a fourth mass of the second sampler after the tar elution is completed is obtained;

[0032] The moisture, tar and ash contents in the target gas intercepted by the gas sampler are obtained based on the first mass, the second mass, the third mass, the fourth mass and the volume of the sampled target gas, and the tar and dust contents in the sampled gas can be calculated.

[0033] The present invention provides a system and method for detecting the tar and ash content in gas. By arranging a gas sampler, a gas supply device, a moisture evaporation and purge detection device, a tar elution and drying device, and a weighing device, the moisture in the first sampler can be converted into water vapor under the heating of a first heating well, and the water vapor is purged into the detection cell of a Karl Fischer moisture meter by dry purge gas, so as to efficiently and accurately detect the content of water intercepted in the sampler; further, by eluting tar and drying the second sampler in sequence, the mass of the second sampler after tar elution is obtained, and then combined with the moisture content in the target gas intercepted by the gas sampler, the tar and ash content in the target gas is quantitatively obtained.

[0034] Based on the detection system shown in the present invention, in actual applications, under normal circumstances, the detection time of the moisture content in the gas sampler does not exceed 10 minutes, and the time for tar elution and drying of the gas sampler does not exceed 50 minutes, thereby having a higher detection efficiency.

[0035] It can be seen that the system shown in the present invention has a simple structure and high detection efficiency, and is convenient for accurately detecting the contents of moisture, tar and ash in the target gas intercepted by the gas sampler. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic structural diagram of using a gas sampler provided by the present invention to sample a target gas;

[0038] Figure 2 It is a schematic cross-sectional view of the cartridge type gas sampler provided by the present invention;

[0039] Figure 3 It is a structural schematic diagram of a system for detecting tar and ash content in gas provided by the present invention;

[0040] Figure 4 It is a flow chart of the method for detecting tar and ash content in gas provided by the present invention.

[0041] Reference numerals:

[0042] 101: Gas flow channel; 102: First sampling tube; 103: Gas sampler; 104: Second sampling tube; 105: Wet gas flowmeter; 106: Sampling valve; 111: First housing; 112: Second housing; 113: Filter element; 1: First air filter; 2: Diaphragm pump; 3: First drying bottle; 4: Second drying bottle; 5: Second air filter; 6: Three-way valve; 7: First gas flowmeter; 8: First preheating tube; 9: First heating well; 10: Second sealing quick connector; 11: First sampler; 12 : First sealing quick connector; 13: Heating device; 14: Detection cell; 15: Karl Fischer moisture detector main unit; 16: Second gas flowmeter; 17: Second preheating tube; 18: Second heating well; 19: Second sampler; 20: Second one-way valve; 21: Third sealing quick connector; 22: First one-way valve; 23: Peristaltic pump; 24: Eluent bottle; 25: Fourth sealing quick connector; 26: Normally closed solenoid valve; 27: Waste liquid bottle; 28: First pipeline; 29: Second pipeline; 30: Third pipeline; 31: Fourth pipeline. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] The following combination Figures 1-4 The present invention describes a system and method for detecting the tar and ash content in gas.

[0045] like Figures 1 to 3 As shown, this embodiment provides a system for detecting the tar and ash content in gas, including: a gas sampler, a gas supply device, a water evaporation and purge detection device, a tar elution and drying device, and a weighing device.

[0046] like Figure 1 As shown, when using a gas sampler 103 to sample the target gas, in this embodiment, one end of a first sampling tube 102 can be extended into the gas flow channel 101 where the target gas is located, and the other end of the first sampling tube 102 can be connected to the gas inlet end of the gas sampler 103. Simultaneously, in this embodiment, the gas outlet end of the gas sampler 103 can be connected to one end of a second sampling tube 104, and the other end of the second sampling tube 104 can be connected to a wet gas flow meter 105.

[0047] A sampling valve 106 is mounted on the second sampling tube 104 to regulate the flow rate of the sampled target gas. A wet gas flowmeter 105 is used to detect the flow rate of the target gas. By controlling the sampling time, the gas sampler 103 can sample a preset volume of target gas.

[0048] like Figure 2 As shown, the gas sampler 103 shown in this embodiment includes a first shell 111 and a second shell 112. The cover end of the first shell 111 is sealed with the cover end of the second shell 112. The first shell 111 is provided with an air inlet, and the second shell 112 is provided with an air outlet. The air inlet serves as the air inlet end of the gas sampler 103, and the air outlet serves as the air outlet end of the gas sampler 103.

[0049] At the same time, a receiving chamber is formed between the first housing 111 and the second housing 112, within which a filter element 113 is housed. 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 this embodiment is a cartridge filter, with the open end of the filter cartridge facing the air inlet of the first housing 111. The gas sampler 103 of this embodiment can withstand temperatures of at least 300°C without releasing moisture.

[0050] To facilitate the following description, the gas sampler of this embodiment specifically includes a first sampler 11 for completing the initial sampling of the target gas and a second sampler 19 obtained after removing moisture from the first sampler 11 .

[0051] It should be pointed out here that when using a gas sampler for gas sampling, it should be ensured that the gas sampler is in a dry and constant weight state to ensure the accuracy of subsequent test results.

[0052] Furthermore, if Figure 3 As shown, the moisture evaporation and purge detection device includes a first heating well 9 and a Karl Fischer moisture analyzer, which includes a Karl Fischer moisture analyzer main unit 15 and a detection cell 14. The first heating well 9 is used to house a first sampler 11; a gas supply device is used to deliver dried and dust-removed purge gas into the first sampler 11. The moisture in the first sampler 11 is heated by the first heating well 9 and converted into water vapor. The water vapor is then purged by the purge gas into the detection cell 14 of the Karl Fischer moisture analyzer.

[0053] The tar elution and drying device includes an eluent bottle 24 and a second heating well 18. The second heating well 18 is used to install a second sampler 19 and heat the second sampler 19. The eluent bottle 24 contains eluent for eluting tar. The eluent in the eluent bottle 24 is quantitatively delivered to the second sampler 19 via a peristaltic pump. The eluent, heated by the second heating well 18, accelerates the dissolution of tar adhering to the second sampler 19. The eluent then opens a normally closed solenoid valve 26 and is discharged into a waste liquid bottle 27. This step is repeated at least three times to achieve the purpose of tar elution. Under the heating of the second heating well 18, the gas supply device is also used to deliver a dried and dust-removed purge gas into the second sampler 19 after the tar elution treatment to remove moisture and residual eluent in the second sampler 19.

[0054] The weighing device is used to detect 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 embodiment is preferably an analytical balance with an accuracy of 0.1 mg.

[0055] Specifically, this embodiment provides a gas sampler, a gas supply device, a moisture evaporation and purge detection device, a tar elution and drying device, and a weighing device. Under the heating of the first heating well 9, the moisture in the first sampler 11 can be converted into water vapor, and the water vapor is purged to the detection cell 14 of the Karl Fischer moisture meter by dry purge gas, so as to efficiently and accurately detect the moisture content intercepted by the first sampler 11; further, by eluting and drying the tar in the second sampler 19 in sequence, the mass of the second sampler 19 after tar elution is obtained, and then combined with the moisture content in the first sampler 11, the tar and ash content in the target gas intercepted by the gas sampler is quantitatively obtained.

[0056] Normally, the detection time of the moisture content in the gas sampler does not exceed 10 minutes, and the time for tar elution and drying of the gas sampler does not exceed 50 minutes, thus having a high detection efficiency.

[0057] It can be seen that the system shown in this embodiment has a simple structure and high detection efficiency, and is convenient for accurately detecting the contents of moisture, tar and ash in the target gas intercepted by the gas sampler.

[0058] In some embodiments, due to the large number of samples, in order to further improve the detection efficiency, the moisture evaporation and purge detection device and the tar elution and drying device shown in this embodiment can be respectively provided with one or more to enable different detection processes of the target gas to be performed simultaneously.

[0059] like Figure 3As shown, in each moisture evaporation and purge detection device and each tar elution and drying device, the first heating well 9 and the second heating well 18 are arranged vertically. In actual operation, the heating temperature of the first heating well 9 and the second heating well 18 can be set to 105-300°C. The upper and lower wellheads of the first heating well 9 form a continuous heating chamber.

[0060] Among them, the lower end of the first heating well 9 can be either flat-bottomed or funnel-shaped, depending on the shape of the gas sampler used, so that the outer wall of the gas sampler forms good contact with the inner wall of the heating chamber.

[0061] Here, to ensure the drying effect of the moisture in the first sampler 11, the outer wall of the first sampler 11 is arranged in contact with the inner wall of the first heating well 9 in this embodiment. The gas outlet of the first sampler 11 extends from the bottom of the first heating well 9, and the gas inlet of the first sampler 11 extends from the top of the first heating well 9. In this way, the purge gas that has been dried and purified absorbs the heat from the first heating well 9 and is then supplied from the bottom of the first heating well 9 to the first sampler 11. The water vapor in the first sampler 11 is purged by the purge gas and discharged from the gas inlet of the first sampler 11 and purged into the detection cell 14 of the Karl Fischer titrator.

[0062] Accordingly, in order to facilitate the elution of tar adhered to the second sampler 19 and the drying of moisture in the second sampler 19, the outer wall of the second sampler 19 is arranged in contact with the inner wall of the second heating well 18 in this embodiment, the air inlet end of the second sampler 19 extends from the top of the second heating well 18, and the air 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 air outlet end of the second sampler 19 under the action of gas pressure and gravity.

[0063] In some embodiments, 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 includes a first pipeline 28, a purification device and a first preheating tube 8.

[0064] The purification device is arranged on the first pipeline 28, and one end of the first pipeline 28 can be selectively connected to one end of the first preheating tube 8; at least a portion of the first preheating tube 8 is in contact with the outer wall of the first heating well 9 to absorb the heat energy of the outer wall of the first heating well 9; the other end of the first preheating tube 8 is connected to the air outlet end of the first sampler 11 in a detachable connection manner, and the air inlet end of the first sampler 11 is connected to one end of the second pipeline 29 in a detachable connection manner, and the other end of the second pipeline 29 extends below the liquid surface in the detection tank 14 of the Karl Fischer moisture meter.

[0065] The purification device is used to remove moisture and solid impurities entering the first pipeline 28 .

[0066] like Figure 3 As shown, a gas pumping device is installed on the first pipeline 28, and the gas pumping device can be a diaphragm pump 2 well known in the art.

[0067] At the same time, the purification device includes at least one set of dryers and at least one set of filters arranged on the first pipeline 28.

[0068] Specifically, the dryer can be a drying bottle filled with a desiccant, for example, the dryer includes a primary drying bottle 3 and a secondary drying bottle 4. At the same time, the filter includes a primary air filter 1 and a secondary air filter 5.

[0069] Based on the above arrangement, according to the pumping action of the diaphragm pump 2 on the gas, the air in the environment is filtered by the primary air filter 1, and then enters the desiccant in the primary drying bottle 3 through the diaphragm pump 2. The gas in the primary drying bottle 3 then enters the desiccant in the secondary drying bottle 4. Then, the gas in the secondary drying bottle 4 passes through the secondary air filter 5. The gas output by the secondary air filter 5 is input from the first end of the three-way valve 6 and output from the second end of the three-way valve 6. Then, it is transported to the first preheating tube 8 through the first gas flowmeter 7.

[0070] like Figure 3 As shown, the first preheating tube 8 shown in this embodiment is preferably a heat conducting tube, for example, a heat conducting copper tube. The first preheating tube 8 is spirally wound around the outer wall of the first heating well 9 and extends from the outer wall of the first heating well 9 from top to bottom, so that the first preheating tube 8 can fully absorb the heat energy from the first heating well 9 to heat the purge gas in the first preheating tube 8. Of course, in this embodiment, a portion of the first preheating tube 8 can also be arranged to be reciprocated along the axial direction of the outer wall of the first heating well 9 to utilize the heat of the first heating well 9 to heat the purge gas in the first preheating tube 8.

[0071] In some embodiments, as Figure 3 As shown, in this embodiment, the other end of the first preheating tube 8 is connected to the air outlet end of the first sampler 11 through the second sealing quick connector 10, and the air inlet end of the first sampler 11 is connected to one end of the second pipeline 29 through the first sealing quick connector 12; the first sealing quick connector 12 and the second sealing quick connector 10 are arranged opposite to each other in the upper and lower positions along the central axis of the first heating well 9, the second sealing quick connector 10 is located on the central axis of the bottom of the first heating well 9, and the first sealing quick connector 12 is movably arranged on the central axis above the wellhead of the first heating well 9.

[0072] During testing, first insert the air inlet end of the first sampler 11 into the first sealing quick connector 12 to connect with one end of the second pipeline 29, then insert the first sampler 11 into the first heating well 9 and insert the air outlet end of the first sampler 11 into the second sealing quick connector 10 to connect with the first preheating tube 8.

[0073] In this way, after the first end and the second end of the three-way valve 6 are controlled to be connected, under the monitoring of the first gas flowmeter 7, the dry and dust-removed purge gas flows through the first preheating tube 8, and is preheated by the heating action of the outer wall of the first heating well 9. Then, it enters the first sampler 11 from the second sealing quick connector 10 through the air outlet end of the first sampler 11. The moisture in the first sampler 11 is vaporized 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 air inlet end of the first sampler 11 under the purging of the purge gas; then, it is transported to the detection cell 14 of the Karl Fischer moisture meter through the second pipeline 29, and the moisture content is detected by the Karl Fischer moisture meter.

[0074] Here, in order to prevent water vapor from condensing on the second pipeline 29 and affecting the accuracy of the detection result, in this embodiment, a heating device 13 is installed on at least a portion of the outer wall of the second pipeline 29.

[0075] The heating device 13 is preferably a heating pipe, which is sleeved on the outer wall of the second pipeline 29 .

[0076] Based on the above embodiment, this embodiment obtains the second sampler 19 after drying the water in the first sampler 11. In order to elute the tar in the second sampler 19, this embodiment further elutes the tar based on the eluent in the eluent bottle 24.

[0077] like Figure 3 As shown, the tar elution and drying device of this embodiment further includes a peristaltic pump 23, specifically a quantitative peristaltic pump; an eluent bottle 24 containing an eluent suitable for eluting tar. The eluent is an organic solvent with good solubility for tar, and can be any of trichloroethane, benzene, xylene, and ethanol. Trichloroethane is preferably used as the eluent because it not only has good solubility for tar but is also non-flammable and non-explosive.

[0078] In some embodiments, the eluent bottle 24 is connected to one end of the third pipeline 30 , the other end of the third pipeline 30 is connected to the air inlet end of the second sampler, and the peristaltic pump 23 is installed on the third pipeline 30 .

[0079] In this way, after starting the peristaltic pump 23, the peristaltic pump 23 can pump the eluent in the eluent bottle 24 into the second sampler 19, so as to ensure that the eluent reaching the preset temperature is in full contact with the tar attached to the filter element of the second sampler 19 under the heating action of the second heating well 18, thereby accelerating the dissolution of the tar. After multiple elutions, the tar is separated from the filter element, and the eluted waste liquid is discharged into the waste liquid bottle 27, and finally the ash remains on the filter element.

[0080] In some embodiments, the third end of the three-way valve 6 may be connected to one end of the second preheating tube 17. The third end of the three-way valve 6 is connected to one end of the second gas flow meter 16, and the other end of the second gas flow meter 16 is connected to one end of the second preheating tube 17.

[0081] In this way, when the first end and the third end of the three-way valve 6 are controlled to be connected, the amount of the purge gas introduced into the second sampler 19 can be controlled through the second preheating tube 17 under the flow monitoring of the gas by the second gas flow meter 16.

[0082] Here, in this embodiment, at least a portion of the second preheating tube 17 is arranged to fit against the outer wall of the second heating well 18 to absorb the heat energy from the second heating well 18; the other end of the second preheating tube 17 is connected to the air inlet end of the second sampler 19 in a detachable manner.

[0083] The second preheating tube 17 is preferably a heat conducting tube, for example, a heat conducting copper tube. The second preheating tube 17 is spirally wound around the outer wall of the second heating well 18 and extends downward from the outer wall of the second heating well 18, so that the second preheating tube 17 can fully absorb the heat energy from the second heating well 18 to heat the purge gas in the second preheating tube 17. Of course, in this embodiment, a portion of the second preheating tube 17 can also be arranged to be reciprocated along the axial direction of the outer wall of the second heating well 18 to utilize the heat from the second heating well 18 to heat the purge gas in the second preheating tube 17.

[0084] In this way, after completing the elution of the tar in the second sampler 19, this embodiment can use the second heating well 18 to heat the second sampler 19, and under the purge of a certain amount of heat purge gas, quickly remove the residual organic solvent and moisture in the filter element of the second sampler 19 until the second sampler 19 reaches a constant weight.

[0085] It should be pointed out here that the other end of the peristaltic pump 23 shown in this embodiment is connected to the air inlet end of the second sampler 19 through the first one-way valve 22. The first one-way valve 22 is arranged on the third pipeline 30 and is used to control the directional delivery of the eluent output by the peristaltic pump 23 to the second sampler 19.

[0086] At the same time, in this embodiment, a second one-way valve 20 is provided on the second preheating tube 17 , and the second one-way valve 20 is used to control the directionality of the gas in the second preheating tube 17 and to deliver it to the second sampler 19 .

[0087] In addition, the gas outlet of the second sampler shown in this embodiment is connected to the waste liquid bottle via a fourth pipe 31. A control valve is installed on the fourth pipe 31. The control valve is normally closed and is used to control the retention, extraction, discharge, and drying of the organic solvent in the second sampler 19. The control valve is preferably a normally closed solenoid valve 26 known in the art.

[0088] Here, the installation method of the second sampler 19 toward the second heating well 18 shown in this embodiment can refer to the installation method of the first sampler 11 toward the first heating well 9.

[0089] In some examples, this embodiment may be configured to have the other end of the second preheating tube 17 and the other end of the third pipeline 30 connected to the air inlet end of the second sampler 19 through the third sealing quick connector 21, and the air outlet end of the second sampler 19 connected to one end of the fourth pipeline 31 through the fourth sealing quick connector 25, and the other end of the fourth pipeline 31 is connected to the waste liquid bottle; the third sealing quick connector 21 and the fourth sealing quick connector 25 are arranged opposite to each other in the upper and lower directions along the central axis of the second heating well 18, the fourth sealing quick connector 25 is located on the central axis of the bottom of the second heating well 18, and the third sealing quick connector 21 is movably arranged on the central axis above the wellhead of the second heating well 18.

[0090] In specific operations, the other end of the second preheating tube 17 and the other end of the third pipeline 30 can be jointly plugged into one end of the third sealing quick connector 21, and the air inlet end of the second sampler 19 can be plugged into the other end of the third sealing quick connector 21. Then, the second sampler 19 is inserted into the second heating well 18 from top to bottom until the air outlet end of the second sampler 19 is plugged into the fourth sealing quick connector 25, so that the air outlet end of the second sampler 19 is connected to one end of the fourth pipeline 31 through the fourth sealing quick connector 25.

[0091] like Figure 4 As shown, this embodiment also provides a method for detecting the tar and ash content in gas using a detection system as described in any of the above items, comprising the following steps:

[0092] Step 410 , obtaining a first mass of the gas sampler after drying, and a second mass of the dried gas sampler after sampling a preset volume of target gas.

[0093] In step 420, after the first sampler has completed sampling the target gas, it is installed in the first heating well. Under the heating of the first heating well, the water in the first sampler is converted into water vapor. The purge gas that has been dried and dust-removed is transported into the first sampler through the gas supply device, so that the water vapor in the first sampler is purged into the measuring cell of the Karl Fischer moisture meter, and the third mass of the water in the first sampler is obtained through the Karl Fischer moisture meter.

[0094] In step 430, when the second sampler is installed in the second heating well, the tar in the second sampler is first eluted at least three times with an eluent under the heating of the second heating well, and then a purge gas is delivered to the second sampler through the gas supply device until the second sampler that has completed the tar elution reaches a dry state, and the fourth mass of the second sampler that has completed the tar elution after drying is obtained.

[0095] Step 440 , obtaining the moisture, tar, and ash contents in the target gas intercepted by the gas sampler based on the first mass, the second mass, the third mass, the fourth mass, and the volume of the sampled target gas.

[0096] Here, based on the above steps, the detection of moisture, tar and ash content in gas in this embodiment can refer to the following operations:

[0097] 1. Dry and constant weight of the gas sampler: Install the gas sampler in the first heating well and complete the corresponding pipeline connections. Next, the first heating well is controlled to be heated to 105-200°C, and the diaphragm pump is started. The air in the environment is filtered through the first-level air filter and then enters the desiccant in the first-level drying bottle through the diaphragm pump. The gas in the first-level drying bottle then enters the desiccant in the second-level drying bottle. Then, the gas in the second-level drying bottle passes through the second-level air filter, and the gas output by the second-level air filter is sequentially transported to the first preheating tube through the three-way valve and the first gas flowmeter; under the monitoring of the first gas flowmeter, the dry and pure purge gas flows through the first preheating tube, and after being preheated by the heating action of the first heating well, it is input from the lower end of the first sampler to the air inlet end of the gas sampler. The moisture in the gas sampler is vaporized under the action of the first heating well and is purged by the purge gas of a certain temperature through the second pipeline. When the gas sampler reaches a dry constant weight, an analytical balance is used to weigh the initial mass M1 of the gas sampler that reaches a dry constant weight. The initial mass M1 is the sum of the masses of the gas sampler shell and the filter membrane or filter element.

[0098] 2. Sampling: Use the dry, constant-weight, and well-weighed gas sampler described above to sample the target gas. The sampling time and volume will depend on the tar, moisture, and dust content of the target gas. Try to obtain as much gas sample as possible while ensuring that no gas penetrates the filter membrane (or filter barrel). Next, use an analytical balance to weigh the total mass M2 of the gas sampler after sampling to the nearest 0.1 mg. This mass represents the total mass of the original gas sampler and the moisture, dust, and tar it intercepts.

[0099] 3. Detection of intercepted moisture: Install the first sampler that completes the target gas sampling in the first heating well. After completing the pipeline connection, follow the operation in step 1 to control the gas supply device to deliver purge gas to the first sampler corresponding to the first heating well. Control the gas flow rate to 50-300 ml / min and the purge time until the water vapor in the first sampler is completely purged into the measuring cell of the Karl Fischer moisture meter. The total moisture mass M3 in the first sampler can be detected.

[0100] 4. Detection of dust quality: Install the second sampler obtained after removing the moisture in the second heating well. After completing the corresponding pipeline connection, set the heating temperature of the second heating well to close to the boiling point of the eluent. After the heating temperature of the second heating well stabilizes, while ensuring that the solenoid valve is closed, start the peristaltic pump to pump a preset amount of eluent into the second sampler, so that the eluent is in full contact with the tar attached to the second sampler in a slightly boiling state. After the eluent remains in the second sampler for a preset time to allow the tar to fully dissolve, open the solenoid valve, control the preheated purge gas to pass into the second sampler, and discharge the waste liquid into the waste liquid bottle. Repeat the above steps 3 to 6 times to completely elute and discharge the tar in the second sampler.

[0101] Next, the heating temperature of the second heating well is raised to 105-200°C, and dry preheated air is continuously introduced into the second sampler to utilize the dry preheated air to accelerate the evaporation and elimination of residual moisture and eluent in the second sampler until the second sampler reaches a constant weight. The mass of the second sampler is obtained by weighing on a balance as M4, which is the sum of the mass of the second sampler body and the dust.

[0102] 5. Calculation: After sampling, the mass of tar, water, and dust intercepted by the gas sampler is M5 = M2 - M1; the mass of intercepted water is M3; the mass of intercepted dust is M6 = M4 - M1; and the mass of intercepted tar is M7 = M2 - M3 - M4. Since the sampling volume of the target gas is known, the moisture, tar, and ash contents of the target gas intercepted by the gas sampler can be calculated.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A system for detecting tar and ash content in gas, characterized in that: include: Gas sampler, gas supply device, water evaporation and purge detection device, tar elution and drying device and weighing device; The gas sampler includes a first sampler for completing the initial sampling of the target gas and a second sampler obtained after removing the moisture in the first sampler; The moisture evaporation and purge detection device includes a first heating well and a Karl Fischer moisture analyzer; the first heating well is used to install the first sampler and heat the first sampler; the gas supply device is used to deliver a purge gas that has been dried and dust-removed into the first sampler, and the moisture in the first sampler is converted into water vapor under the heating of the first heating well. The water vapor is purged by the purge gas into the detection cell of the Karl Fischer moisture analyzer; The tar elution and drying device includes an eluent bottle and a second heating well. The second heating well is used to install the second sampler and heat the second sampler. The eluent bottle is used to pass eluent into the second sampler. The eluent dissolves the tar in the second sampler under the heating of the second heating well. The gas supply device is also used to deliver purge gas to the second sampler after the tar elution treatment, so as to remove moisture and residual eluent in the second sampler under the heating of the second heating well. The weighing device is used to detect the mass of the first sampler and the second sampler; The gas supply device includes a first pipeline, a purification device and a first preheating pipe; The purification device is disposed on the first pipeline, one end of which is selectively connected to one end of the first preheating tube; at least a portion of the first preheating tube is in contact with the outer wall of the first heating well to absorb heat energy from the outer wall of the first heating well; the other end of the first preheating tube is connected to the air outlet of the first sampler, and the air inlet of the first sampler is connected to the detection cell of the Karl Fischer moisture analyzer; Wherein, the purification device is used to remove moisture and solid impurities entering the first pipeline; The air inlet end of the first sampler is connected to one end of a second pipeline, and the other end of the second pipeline extends into the detection cell of the Karl Fischer moisture analyzer; The tar eluting and drying device further comprises a peristaltic pump; The eluent bottle is connected to one end of the third pipeline, the other end of the third pipeline is connected to the air inlet end of the second sampler, and the peristaltic pump is installed on the third pipeline; The air inlet end of the second sampler extends from the top of the second heating well, the air outlet end of the second sampler extends from the bottom of the second heating well, and the eluent bottle contains eluent for eluting tar.

2. The system for detecting tar and ash content in gas according to claim 1, characterized in that: The outer wall of at least a portion of the second pipeline is in contact with the heat tracing device.

3. The system for detecting tar and ash content in gas according to claim 1, characterized in that: The first pipeline is equipped with a gas pumping device; And / or, the purification device includes at least one set of dryers and at least one set of filters arranged on the first pipeline.

4. The system for detecting tar and ash content in gas according to claim 1, characterized in that: The gas outlet end of the second sampler is connected to the waste liquid bottle through a fourth pipeline, and a control valve is installed on the fourth pipeline.

5. The system for detecting tar and ash content in gas according to claim 1, characterized in that: One end of the first pipeline can be selectively connected to one end of the second preheating tube; at least a portion of the second preheating tube is in contact with the outer wall of the second heating well to absorb heat energy from the outer wall of the second heating well; the other end of the second preheating tube is connected to the air inlet end of the second sampler.

6. The system for detecting tar and ash content in gas according to claim 5, characterized in that: The other end of the peristaltic pump is connected to the air inlet end of the second sampler through a first one-way valve. The first one-way valve is provided on the third pipeline and is used to control the direction of delivery of the eluent output by the peristaltic pump to the second sampler. The second preheating tube is provided with a second one-way valve, and the second one-way valve is used to control the directionality of the gas in the second preheating tube to be transported to the second sampler.

7. The system for detecting tar and ash content in gas according to claim 5, characterized in that: The water evaporation and purge detection device and the tar elution and drying device can be provided as one or more devices, and the first heating well and the second heating well are vertically distributed; And / or, the other end of the first preheating tube is connected to the air outlet end of the first sampler through a second sealing quick connector, and the air inlet end of the first sampler is connected to one end of the second pipeline through a first sealing quick connector; the first sealing quick connector and the second sealing quick connector are arranged opposite each other in an upper and lower position along the central axis of the first heating well, the second sealing quick connector is located 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 wellhead of the first heating well; The other end of the second preheating tube and the other end of the third pipeline are connected to the air inlet end of the second sampler through a third sealing quick joint, and the air outlet end of the second sampler is connected to one end of the fourth pipeline through a fourth sealing quick joint, and the other end of the fourth pipeline is connected to the waste liquid bottle; the third sealing quick joint and the fourth sealing quick joint are arranged opposite to each other in the upper and lower directions along the central axis of the second heating well, the fourth sealing quick joint is located on the central axis of the bottom of the second heating well, and the third sealing quick joint is movably arranged on the central axis above the wellhead of the second heating well.

8. A method for detecting tar and ash content in gas according to any one of claims 1 to 7, characterized in that: include: obtaining a first mass of the gas sampler after drying and a second mass of the dried gas sampler after sampling a preset volume of target gas; When the first sampler after sampling the target gas is installed in the first heating well, the water in the first sampler is converted into water vapor under the heating of the first heating well. The purge gas that has been dried and dust-removed is delivered into the first sampler through the gas supply device, so that the water vapor in the first sampler is purged into the measuring cell of the Karl Fischer titrator. The third mass of the water in the first sampler is obtained by the Karl Fischer titrator. When the second sampler is installed in the second heating well, under the heating of the second heating well, the tar in the second sampler is first eluted at least three times using an eluent, and then a purge gas is supplied to the second sampler through the gas supply device until the second sampler, from which the tar elution is completed, reaches a dry state, and a fourth mass of the second sampler after the tar elution is completed is obtained; The contents of moisture, tar and ash in the target gas intercepted by the gas sampler are obtained according to the first mass, the second mass, the third mass, the fourth mass and the volume of the sampled target gas.

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