Portable measurement device capable of accurately measuring CTC value of activated carbon, and measurement method thereof

Abstract

Disclosed in the present invention are a portable measurement device capable of accurately measuring the CTC value of activated carbon, and a measurement method thereof. The device of the present invention comprises an air drying assembly, a flow meter, an organic matter steam bubbling bottle containing carbon tetrachloride inside, an adsorption tube filled with activated carbon, an electronic balance and a computer. The air drying assembly is used for drying air and transferring same to the flow meter, the organic matter steam bubbling bottle and the adsorption tube; a first semiconductor refrigeration piece is arranged at the bottom of the organic matter steam bubbling bottle; the first semiconductor refrigeration piece is used for cooling the organic matter steam bubbling bottle to keep same at a low temperature; and the electronic balance is used for recording mass changes of the adsorption tube in real time and transmitting mass change data to the computer. The device provided by the present application can fast and efficiently measure the carbon tetrachloride adsorption rate of activated carbon, the test result having high accuracy and having an error within 5% compared with a test value obtained by means of the national standard method, thus being capable of fast reflecting the adsorption capacity of activated carbon, and having a relatively high industrial practical application value.

Description

A portable activated carbon CTC value detection device and detection method capable of accurately measuring Technical Field

[0001] The present invention relates to a portable activated carbon CTC value detection device capable of accurately measuring and a detection method thereof, which can quickly and accurately detect the carbon tetrachloride adsorption rate of activated carbon. Background Art

[0002] Activated carbon is widely used in toxic gas purification, waste gas treatment, industrial and domestic water purification, and solvent recovery. Exhaust treatment units in water, air, and soil treatment facilities typically incorporate activated carbon adsorption processes, making regular replacement of the activated carbon crucial for effective waste gas treatment. The timing of replacement depends on whether the activated carbon has reached adsorption saturation or ineffectiveness. However, in actual production processes, activated carbon often fails to be replaced promptly, rendering the treatment facilities ineffective. The saturated portion of the activated carbon in the facility may even release adsorbed pollutants. At present, the determination of the adsorption rate of coal-based granular activated carbon mainly refers to the "Test Method for Coal-based Granular Activated Carbon" (GB / T7702.7-2008, GB / T7702.13-1997). This determination method has high requirements for test conditions, and the detection equipment and steps are relatively complex. There are few corresponding third-party testing institutions on the market. The cycle from sample submission to the issuance of test results is long, and it cannot continuously, effectively, and quickly reflect the adsorption status of the granular activated carbon in use. Especially for ecological governance and restoration projects with tight construction schedules and high requirements for secondary pollution prevention and control, a faster and more accurate adsorption rate of activated carbon will help the environmental management of waste gas adsorption projects. Therefore, how to provide a device for measuring the adsorption rate of activated carbon with fast measurement speed, small result deviation, and economic feasibility is a technical problem that urgently needs to be solved by those skilled in the art.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide a portable activated carbon CTC value detection device and detection method that can accurately measure the adsorption rate of granular activated carbon, which solves the technical problems of complex and long cycle in the determination method of the adsorption rate of granular activated carbon.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A portable activated carbon CTC value detection device capable of precise measurement comprises an air drying component, a flow meter, an organic vapor bubbling bottle, an absorption tube, an electronic balance, and a computer. The organic vapor bubbling bottle contains carbon tetrachloride, and the absorption tube is filled with activated carbon. The air drying component is used to dry the air and convey it to the flow meter. The gas flow rate is controlled by the flow meter and then bubbled into the carbon tetrachloride liquid in the organic vapor bubbling bottle through a pipeline. The gas flowing out of the organic vapor bubbling bottle carries carbon tetrachloride vapor and passes into the lower part of the activated carbon in the absorption tube for absorption. The gas discharged from the absorption tube undergoes tail gas treatment. The electronic balance is used to record mass changes in the absorption tube in real time and calculate the mass change data. The organic vapor bubbling bottle and the absorption tube are both provided with precise temperature control systems for controlling the temperature of their outer walls, so as to precisely control the ambient temperature of the organic vapor bubbling bottle and the absorption tube, respectively.

[0007] Furthermore, the organic vapor bubbling bottle and the absorption tube are both made of stainless steel.

[0008] Furthermore, the precise temperature control system includes a semiconductor refrigeration plate, an aluminum jacket, and a PLC controller. Two vertical cylindrical channels, one on the left and one on the right, are provided at the bottom of the aluminum jacket near the side edge. Heating tubes are inserted into the channels. The bottoms of the heating tubes are connected to a heating power source via wires. The bottom of the aluminum jacket is connected to the semiconductor refrigeration plate to cool it.

[0009] The outer sides of the organic vapor bubbling bottle and the absorption tube are respectively covered with the aluminum jacket and a temperature sensor for monitoring the temperature of the bottle body or the outer wall of the absorption tube is connected to their junction. The temperature sensor transmits the monitored temperature to the corresponding PLC controller. The heating power supply and the semiconductor refrigeration plate connected to the corresponding heating tube are also respectively connected to the PLC controller signal. The temperature of the organic vapor bubbling bottle body or the outer wall of the absorption tube is automatically controlled by the PLC controller. When the temperature is higher than the set temperature, the semiconductor refrigeration plate starts to work for cooling and the heating tube stops working. When the temperature is lower than the set temperature, the semiconductor refrigeration plate stops cooling and the heating tube starts to work for heating, so that the temperature of the organic vapor bubbling bottle body or the outer wall of the absorption tube is maintained at the set temperature.

[0010] Furthermore, the cross-section of the absorption tube is T-shaped, including an upper gas buffer tube and a lower filling tube, wherein one of the aluminum jackets is provided with a tube groove matching the shape of the filling tube, and the filling tube is fitted and embedded in the tube groove; the filling tube is filled with the activated carbon.

[0011] Furthermore, the diameter of the absorption tube where the activated carbon is filled is 1 to 3 cm, preferably 2 cm, the particle size of the activated carbon is 0.5 to 40 meshes, and the filling mass of the activated carbon is 1 to 3 g.

[0012] Furthermore, a gas distributor is installed in the organic steam bubbling bottle, and a pipe at the flow meter outlet is introduced into the bottom of the carbon tetrachloride liquid in the organic steam bubbling bottle and connected to the gas distributor, so that the size of the bubbles bubbling is uniform, reducing the error caused by the change in bubble size due to air flow fluctuations; the organic steam bubbling bottle is also provided with a liquid level gauge for monitoring the liquid level inside it.

[0013] Furthermore, an air outlet pipe is provided on the top of the organic steam bubbling bottle, and absorbent cotton is provided at the inlet of the air outlet pipe to prevent the bulging bubbles from carrying out carbon tetrachloride droplets and flowing out into the subsequent activated carbon. The outlet of the air outlet pipe is connected to the lower part of the absorption tube through a pipeline, and the gas carrying carbon tetrachloride vapor is passed into the bottom of the activated carbon.

[0014] Furthermore, the air drying assembly includes an air pump, a silica gel drying tube, an anhydrous calcium chloride drying tube and a buffer bottle which are sequentially connected by pipelines, and the buffer bottle is further connected to the flow meter through a pipeline.

[0015] Preferably, the air pump, anhydrous calcium chloride drying tube, color-changing silica gel drying tube, buffer bottle, organic vapor bubbling bottle, absorption tube, and tail gas absorption bottle are sequentially connected through a polytetrafluoroethylene tube.

[0016] The present invention also provides a detection method for a portable activated carbon CTC value detection device that can accurately measure the value. The air drying component is used to dry and remove water from the gas, and the dried gas is driven to enter an organic vapor bubbling bottle for bubbling, carrying carbon tetrachloride vapor into an absorption tube for adsorption. The absorption tube is placed on an electronic balance, and the mass change of the absorption tube is monitored in real time. By programming an activated carbon adsorption rate calculation formula into a computer, the activated carbon adsorption rate is observed in real time on the computer. When the activated carbon adsorption rate does not change within 10-20 seconds, it can be regarded as adsorption saturation. The carbon tetrachloride gas that is not completely adsorbed is processed through an exhaust gas absorption bottle to prevent the tester from inhaling carbon tetrachloride and being poisoned.

[0017] Furthermore, the mass m1 of the empty absorption tube is input into the computer, a certain amount of activated carbon test sample that meets the drying requirements is taken and loaded into the absorption tube, and the total mass m2 of the absorption tube and the unventilated activated carbon test sample is weighed, and the total mass of the absorption tube and the unventilated activated carbon test sample is transmitted to the computer via a data line connecting the electronic balance to the computer. The absorption tube is connected to an organic vapor bubbling bottle, the gas is dried and dehydrated through an air drying component, and the dried gas is driven into the organic vapor bubbling bottle for bubbling, carrying carbon tetrachloride vapor into the absorption tube for adsorption, until the digital display of the electronic balance does not change within 10-20 seconds to determine adsorption saturation. After adsorption saturation, the electronic balance transmits the adsorption saturation mass m3 to the computer, and the activated carbon carbon tetrachloride adsorption rate is calculated according to the formula for calculating carbon tetrachloride adsorption rate programmed into the computer. The adsorption mass fraction of activated carbon for carbon tetrachloride is calculated according to the following formula:

[0018] The present invention provides a simple activated carbon carbon tetrachloride adsorption value detection device and detection method. The device may include an activated carbon detection mechanism, the activated carbon detection mechanism including an air drying component, an organic vapor bubbling bottle, and an absorption tube connected in sequence. Carbon tetrachloride is provided in the organic vapor bubbling bottle, the absorption tube has a cylindrical structure and an activated carbon test sample is placed inside. The absorption tube is placed on an electronic balance for weighing, and the change in the digital display of the electronic balance is used to determine whether the activated carbon is adsorbed saturated. The air drying component is used to dry the air and drive the dried air to flow through the organic vapor bubbling bottle and the absorption tube in sequence, so that the air carries carbon tetrachloride into the absorption tube after flowing through the organic vapor bubbling bottle. A semiconductor refrigeration plate is connected to the bottom of the organic vapor bubbling bottle to control the bubbling of the bubbling bottle at zero degrees Celsius. By selecting granular carbon and honeycomb carbon of different masses and testing them using the device of the present invention and the national standard method respectively, it can be found that the device provided by this application can efficiently and quickly determine the carbon tetrachloride adsorption rate of activated carbon. The test results have a small deviation compared with the national standard values, and thus can quickly reflect the adsorption capacity of activated carbon, and has strong practical industrial application value.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) Precise temperature control. The organic vapor bubbling bottle is made of stainless steel. The bottom of the outer aluminum jacket has two cylindrical holes. Heating tubes are placed in the holes. The bottom is connected to a semiconductor refrigeration chip for cooling. A temperature sensor is connected to the outside of the bottle body. The temperature sensor transmits the temperature of the organic vapor bubbling bottle to the PLC controller, which automatically controls the temperature. When the temperature is higher than 0°C, the semiconductor refrigeration chip starts to work to cool. When the temperature is lower than 0°C, the semiconductor refrigeration chip stops cooling and the heating tube starts to work to heat up, so that the temperature of the organic vapor bubbling bottle is maintained at 0°C. The absorption tube is made of stainless steel and is embedded in the aluminum jacket. The bottom of the aluminum jacket has two cylindrical holes. Heating tubes are placed in the holes. The bottom is connected to a semiconductor refrigeration chip. The temperature sensor transmits the surface temperature of the absorption tube to the PLC controller, which automatically controls the temperature. When the absorption tube temperature is lower than 25°C, the heating tube starts to work to heat up. When the temperature is higher than 25°C, the semiconductor refrigeration chip starts to work to cool down, thereby ensuring that the absorption tube temperature remains at 25°C.

[0021] (2) The device of the present invention is an integrated complete set of devices with the advantages of rapid detection, good repeatability, and reduced weighing errors. First, the absorption tube is placed on an electronic balance, omitting the process of removing it from the water, wiping it dry, and weighing it in the national standard test method. This reduces the errors caused by the decomposition of carbon tetrachloride adsorbed on the activated carbon in the adsorption tube due to insufficient wiping and opening the pipeline, making the results more accurate. In addition, because the wiping and weighing process is omitted, the test time is shortened and the detection speed is faster. Through repeated tests, the repeated results are good.

[0022] (3) Online real-time detection. Place the absorption tube on an electronic balance to monitor the weight change of the absorption tube in real time. The electronic balance is connected to a computer via a data cable, and the mass change is transmitted to the computer. The activated carbon adsorption rate calculation formula is programmed into the computer, and the activated carbon tetrachloride adsorption rate is observed in real time.

[0023] (4) The tail gas is recovered without causing secondary pollution. The carbon tetrachloride gas that is not completely adsorbed is treated by the tail gas absorption bottle. The tail gas absorption bottle is filled with activated carbon, which is replaced regularly. The activated carbon that is completely adsorbed is desorbed and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a portable activated carbon CTC value detection device capable of precise temperature control provided by an embodiment of the present invention;

[0025] FIG2 is a schematic structural diagram of the connection structure between an organic vapor bubbling bottle and an absorption tube in a portable activated carbon CTC value detection device capable of precise temperature control provided by the present invention;

[0026] 3 is a comparison chart of the CTC values ​​of Tangshan Tianhe granular carbon at different masses measured in Example 1 of the present invention and the CTC values ​​measured by the national standard method;

[0027] FIG4 is a comparison chart of the CTC values ​​of Yuesheng honeycomb carbon measured at different masses in Example 2 of the present invention and the CTC values ​​measured by the national standard method;

[0028] 5 is a comparison chart of the CTC values ​​measured by Nancheng Printing Granular Carbon at different masses and the CTC values ​​measured by the national standard method in Example 3 of the present invention;

[0029] 6 is a comparison chart of the CTC values ​​of activated carbon of different masses measured by Tangshan Tianhe granular carbon with an adsorption time of 30 minutes and the CTC values ​​measured by the national standard method in Example 4 of the present invention;

[0030] 7 is a comparison chart of the CTC values ​​of activated carbon of different masses measured with the national standard method when the adsorption time of Yuesheng honeycomb carbon is 30 minutes in Example 5 of the present invention;

[0031] FIG8 is a comparison chart of the CTC values ​​measured for activated carbon of different masses with the CTC values ​​measured by the national standard method when the adsorption time of the granular carbon printed by Nancheng is 30 minutes in Example 6 of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0033] Example 1:

[0034] Referring to Figure 1, the present invention provides a portable activated carbon CTC value detection device with precise temperature control. As shown in Figure 1, the device comprises an air pump 1, a color-changing silica gel drying tube 2, an anhydrous calcium chloride drying tube 3, a flowmeter 4, an organic vapor bubbling bottle 5, and an absorption tube 7, which are connected in sequence via pipes. An electronic balance 9 is used to record the mass change of the absorption tube 7 in real time and calculate the mass change data to a computer 11. Weighed activated carbon is placed in the absorption tube and aerated and bubbling is performed for adsorption measurement.

[0035] The organic vapor bubbling bottle 5 is made of stainless steel and is equipped with a precise temperature control system for controlling the temperature of its outer wall. This precise temperature control system includes an aluminum jacket 13 mounted on the outside of the organic vapor bubbling bottle 5, a semiconductor cooling plate 6 connected to the bottom of the aluminum jacket 13, and a PLC controller. Two vertical cylindrical channels are provided on the left and right sides of the bottom of the aluminum jacket 13 near the side edge. Heating tubes 12 are inserted into these channels. The bottoms of the heating tubes 12 are connected to a heating power source via wires. Threaded holes can be punched in the side walls of the aluminum jacket 13 to communicate with the cylindrical channels. Screws are tightened in the threaded holes to tighten the heating tubes 12. A temperature sensor for monitoring the temperature of the organic vapor bubbling bottle 5 is connected to the junction of the aluminum jacket 13. The temperature sensor transmits the monitored temperature to the corresponding PLC controller. The heating power supply connected to the corresponding heating tube 12 and the semiconductor cooling chip 6 are also connected to the PLC controller signal, and the PLC controller automatically controls the temperature of the organic vapor bubbling bottle 5. When the temperature is above 0°C, the semiconductor cooling chip 6 starts to cool and the heating tube 12 stops. When the temperature is below 0°C, the semiconductor cooling chip 6 stops cooling and the heating tube 12 starts to heat, so that the temperature of the organic vapor bubbling bottle is maintained at 0°C.

[0036] A gas distributor 16 is installed within the organic vapor bubbling bottle 5. A pipe from the outlet of the flowmeter 4 leads to the bottom of the carbon tetrachloride liquid within the organic vapor bubbling bottle 5 and is connected to the gas distributor 16. This ensures uniform bubble size and reduces errors caused by variations in bubble size due to airflow fluctuations. The organic vapor bubbling bottle 5 is also equipped with a level gauge 15 for monitoring the liquid level within it. An air outlet pipe is located at the top of the organic vapor bubbling bottle 5. The inlet of the air outlet pipe is equipped with absorbent cotton 14 to prevent the bubbles from carrying carbon tetrachloride droplets and entering the subsequent activated carbon, which could affect test results. The outlet of the air outlet pipe is connected to the lower portion of the absorption tube 7 via a pipe, allowing the gas carrying carbon tetrachloride vapor to enter the bottom of the activated carbon.

[0037] 2 is a schematic structural diagram of a precise temperature control component in a portable activated carbon CTC value detection device that can precisely control temperature, provided by the present invention. 13 is an aluminum jacket, 14 is absorbent cotton, which prevents the organic vapor bubbling bottle from bringing out micro-droplets when bubbling and affecting the test structure, 15 is a liquid level indicator that indicates the liquid level in the organic vapor bubbling bottle, and 16 is a liquid distributor, which makes the size of the bubbles uniform and reduces the error caused by changes in bubble size due to airflow fluctuations.

[0038] 2 , the cross-section of the absorption tube 7 is T-shaped, comprising an upper gas buffer tube and a lower filling tube 8 , an aluminum jacket 13 is provided with a tube groove matching the shape of the filling tube 8 , and the filling tube 17 is fitted and embedded in the tube groove; the filling tube 8 is filled with the activated carbon.

[0039] The absorption tube 7 is provided with a precise temperature control system for controlling the temperature of its outer wall. The precise temperature control system includes an aluminum jacket 13 mounted on the outside of the filling tube 8, a semiconductor refrigeration plate 6 connected to the bottom of the aluminum jacket 13, and a PLC controller. Two vertical cylindrical channels are provided on the left and right near the side edge of the bottom of the aluminum jacket 13. A heating tube 12 is inserted into the channel. The bottom of the heating tube 12 is connected to a heating power source via a wire. A threaded hole communicating with the cylindrical channel can be punched in the side wall of the aluminum jacket 13. A screw is tightened in the threaded hole to tighten the heating tube 12. A temperature sensor for monitoring the temperature of the outer wall of the absorption tube is connected to the junction of the filling tube 8 and the aluminum jacket 13. The temperature sensor transmits the monitored temperature to the corresponding PLC controller. The heating power source connected to the corresponding heating tube 12 and the semiconductor refrigeration plate 6 are also respectively connected to the PLC controller signal. The temperature is automatically controlled by the PLC controller. When the temperature is higher than 25°C, the semiconductor refrigeration plate 6 starts to cool and the heating tube 12 stops working. When the temperature is lower than 25°C, the semiconductor refrigeration plate 6 stops cooling and the heating tube 12 starts to heat up, so that the surface temperature of the filling tube 8 is maintained at the set temperature.

[0040] The bottom diameter of the aluminum jacket 13 is slightly larger than the cooling area of ​​the semiconductor refrigeration plate 6, so as to facilitate the lead-out of the wire connected to the bottom of the heating tube 12 inside the aluminum jacket 13 and connect it to the external heating power supply.

[0041] In addition, during the test, the absorption tube 7 and its precise temperature control system are covered as a whole with the electronic balance 9 in a closed container to prevent the external air flow from affecting the measurement results of the electronic balance 9.

[0042] First, the CTC value of Tangshan Tianhe granular carbon was determined according to the national standard method when the mass of activated carbon in the absorption tube was 13 grams (the particle size of activated carbon was 0.5-40 mesh). The gas flow rate was 1.5L / min. Quartz wool was added to the upper and lower ends of the absorption tube to prevent small particles of activated carbon from being blown away by the gas. After a long period of adsorption, the weight of the absorption tube weighed by the electronic balance did not change within 20 seconds, which means the adsorption was saturated.

[0043] With other conditions remaining unchanged, the apparatus described in Figures 1-2 of the present invention was used for testing. The diameter of the activated carbon filling portion of the absorption tube was 2 cm, and the activated carbon particle size ranged from 0.5 to 40 mesh. The gas flow rate was 1.5 L / min, the temperature of the organic vapor bubbling bottle 5 was precisely controlled to be 0°C, and the temperature of the outer wall of the filling tube 8 was 25°C. The activated carbon mass was reduced to measure its CTC values ​​at different mass levels. The national standard CTC values ​​and the reduced mass CTC values ​​were measured multiple times, and their mean and standard deviation were calculated. The results are shown in Table 1 and Figure 3. As can be seen from Table 1 and Figure 3, the error between the CTC values ​​measured by reducing the activated carbon mass and the national standard values ​​is within an acceptable range, indicating that the CTC values ​​measured by reducing the activated carbon mass can replace the national standard CTC values.

[0044] Table 1 Comparison of CTC values ​​measured by Tangshan Tianhe granular carbon at different masses and CTC values ​​measured by national standard method Note: The national standard test was conducted three times. The error value refers to the error from the national standard. The value after ± is the error bar.

[0045] Example 2

[0046] First, the CTC value of Yuesheng honeycomb carbon was determined according to the national standard method when the mass of activated carbon in the absorption tube was 13 grams. Then, referring to the test conditions of Example 1 of the present application, the mass of the activated carbon was reduced while other conditions remained unchanged to measure its CTC value at different masses. The national standard CTC value and the reduced mass CTC value were measured multiple times to calculate their mean and standard deviation. The results are shown in Table 2 and Figure 4. As can be seen from Table 2 and Figure 4, the error between the CTC value measured by reducing the mass of the activated carbon and the national standard value is within an acceptable range, that is, the CTC value measured by reducing the mass of the activated carbon can replace the national standard CTC value.

[0047] Table 2 Comparison of CTC values ​​measured by Yuesheng honeycomb carbon at different qualities and CTC values ​​measured by national standard method Note: The national standard test was conducted three times. The error value refers to the error from the national standard. The value after ± is the error bar.

[0048] Example 3

[0049] First, the CTC value of Nancheng Printing Granular Carbon was determined according to the national standard method when the mass of activated carbon in the absorption tube was 13 grams. Then, referring to the test conditions of Example 1 of the present application, the mass of the activated carbon was reduced while other conditions remained unchanged to measure its CTC value at different masses. The national standard CTC value and the reduced mass CTC value were measured multiple times, and their mean and standard deviation were calculated. The results are shown in Table 3 and Figure 5. As can be seen from Table 3 and Figure 5, the error between the CTC value measured by reducing the mass of the activated carbon and the national standard value is within an acceptable range, that is, the CTC value measured by reducing the mass of the activated carbon can replace the national standard CTC value.

[0050] Table 3 Comparison of CTC values ​​measured by Nancheng printing granular carbon at different qualities and CTC values ​​measured by national standard method Note: The national standard test was conducted three times. The error value refers to the error from the national standard. The value after ± is the error bar.

[0051] Example 4

[0052] In order to be able to quickly measure the CTC value of activated carbon. We choose to reduce the time of ventilation adsorption while reducing the mass. First, according to the national standard determination method, the CTC value of Tangshan Tianhe granular carbon in the case of 13 grams of activated carbon mass in the absorption tube is determined. Then, with reference to the test conditions of Example 1 of the present application, when other conditions remain unchanged, while reducing the mass of activated carbon, the adsorption time is shortened to 30 minutes. The CTC values ​​of Tangshan Tianhe granular carbon under different masses are measured within 30 minutes of ventilation. By repeatedly measuring its national standard CTC value and reducing the mass, the CTC value with a shortened adsorption time of 30 minutes is calculated, and its mean and standard deviation are calculated. The results are shown in Table 4 and Figure 6. In general, shortening the adsorption time to 30 minutes and reducing the mass of activated carbon are compared with the national standard determination value. The smaller the mass, the closer the measured CTC value is to the national standard value. When the mass is 1 gram, it is closest to the national standard value. When the mass is greater than 3 grams, the measured CTC value will deviate too much from the national standard value. That is, the CTC value measured by Tangshan Tianhe granular carbon when the adsorption time is 30 minutes and the mass is 1 gram can replace the CTC value measured by the national standard.

[0053] Table 4 Comparison of CTC values ​​of Tangshan Tianhe granular carbon at different masses within 30 minutes and CTC values ​​measured by national standard method Note: The national standard test was conducted three times. The error value refers to the error from the national standard. The value after ± is the error bar.

[0054] Example 5

[0055] In order to be able to quickly measure the CTC value of activated carbon. We choose to reduce the time of ventilation adsorption while reducing the mass. First, according to the national standard determination method, the CTC value of Yuesheng honeycomb carbon in the case of 13 grams of activated carbon mass in the absorption tube is determined. Then, with reference to the test conditions of Example 1 of the present application, when other conditions remain unchanged, while reducing the mass of activated carbon, the adsorption time is shortened to 30 minutes. The CTC values ​​of Yuesheng honeycomb carbon under different masses are measured within 30 minutes of ventilation, and the CTC values ​​of the national standard and the reduced mass are shortened to 30 minutes by repeatedly measuring the CTC values ​​of the national standard and reducing the mass. The mean and standard deviation are calculated, and the results are shown in Table 5 and Figure 7. In general, the adsorption time is shortened to 30 minutes, and the CTC value measured by reducing the mass of activated carbon is compared with the national standard determination value. The smaller the mass, the closer the measured CTC value is to the national standard value. When the mass is 1 gram, it is closest to the national standard value. The larger the mass, the greater the difference between the measured CTC value and the national standard value. That is, the CTC value measured by Yuesheng honeycomb carbon when the adsorption time is 30 minutes and the mass is 1 gram can replace the CTC value measured by the national standard.

[0056] Table 5 Comparison of CTC values ​​measured by Yuesheng honeycomb charcoal at different masses within 30 minutes and CTC values ​​measured by national standard method Note: The national standard test was conducted three times. The error value refers to the error from the national standard. The value after ± is the error bar.

[0057] Example 6

[0058] In order to be able to quickly determine the CTC value of activated carbon. We choose to reduce the time of ventilation adsorption while reducing the mass. First, according to the national standard determination method, the CTC value of Nancheng printing granular carbon when the mass of activated carbon in the absorption tube is 13 grams, then referring to the test conditions of Example 1 of the present application, when other conditions remain unchanged, while reducing the mass of activated carbon, the adsorption time is shortened to 30 minutes, and the CTC value of Nancheng printing granular carbon under different masses is measured within 30 minutes of ventilation. By repeatedly measuring its national standard CTC value and reducing the mass, shortening the adsorption time to 30 minutes, its mean and standard deviation are calculated, and the results are shown in Table 6 and Figure 8. In general, shortening the adsorption time to 30 minutes and reducing the mass of activated carbon are compared with the national standard determination value. The smaller the mass, the closer the measured CTC value is to the national standard value. When the mass is 1 gram, it is closest to the national standard value. The larger the mass, the greater the difference between the measured CTC value and the national standard value. That is, the CTC value measured by Nancheng Printing Granular Carbon when the adsorption time is 30 minutes and the mass is 1 gram can replace the CTC value measured by the national standard.

[0059] Table 6 Comparison of CTC values ​​measured by Nancheng printing granular carbon at different masses within 30 minutes and CTC values ​​measured by national standard method Note: The national standard test was conducted three times. The error value refers to the error from the national standard. The value after ± is the error bar.

[0060] Example 7

[0061] First, the CTC value of the granular carbon was measured according to the national standard method, with the activated carbon mass in the absorption tube being 13 grams. Then, referring to the test conditions of Example 1 of this application, the CTC value was measured by varying the particle size of the activated carbon, while keeping other conditions unchanged. Two groups were tested in parallel under different particle size conditions, and the average CTC value was calculated. The specific results are shown in Table 7. As can be seen from the table, different particle sizes have little effect on the CTC value of the activated carbon.

[0062] Table 7 CTC values ​​of Tanerno granular carbon at different particle sizes

[0063] Example 8

[0064] To verify the importance of temperature control, taking Tangshan Tianhe granular carbon as an example, the organic vapor bubbling bottle was first controlled at 0°C, and then the test conditions of Example 1 of the present application were referred to, other conditions were kept unchanged, and the control temperature of the absorption tube surface was changed. The CTC value was measured under the conditions of 15°C and 35°C. The specific results are shown in Table 8. It can be seen from Table 8 that an increase in the absorption tube temperature will cause the measured CTC value of the activated carbon to be lower.

[0065] Table 8 CTC values ​​of Tangshan Tianhe granular carbon at different temperatures in the absorption tube

[0066] Example 9

[0067] To verify the importance of temperature control, taking Tangshan Tianhe granular carbon as an example, the absorption tube was first controlled at 25°C, and then the test conditions of Example 1 of the present application were referred to, other conditions were kept unchanged, and the control temperature of the surface of the organic vapor bubbling bottle was changed. The CTC value was measured under the conditions of 10°C and -10°C. The specific results are shown in Table 9. It can be seen from Table 9 that the increase in the temperature of the organic vapor bubbling bottle will cause the measured CTC value of the activated carbon to be higher.

[0068] Table 9 CTC values ​​of Tangshan Tianhe granular carbon at different temperatures in the organic vapor bubbling bottle

[0069] Through the above nine embodiments, it can be seen that:

[0070] 1) When other conditions remain unchanged, the CTC value measured by reducing the mass of activated carbon can replace the CTC value measured by the national standard.

[0071] 2) With other conditions unchanged, shortening the adsorption time to 30 minutes and reducing the mass of the activated carbon resulted in a CTC value that was closer to the national standard value. When the mass was 1 gram, the CTC value was closest to the national standard value. The larger the mass, the greater the difference between the measured CTC value and the national standard value. In other words, the CTC value measured with an adsorption time of 30 minutes and a mass of 1 gram can replace the CTC value measured according to the national standard.

[0072] 3) When other conditions remain unchanged, it was found that different particle sizes of activated carbon had almost no effect on the CTC value determination.

[0073] 4) Temperature control is very important for accurately measuring the CTC value of activated carbon. Increasing the temperature of the organic vapor bubbling bottle will cause the measured CTC value of activated carbon to be too high. Increasing the temperature of the absorption tube will cause the measured CTC value of activated carbon to be too low.

[0074] The above four conclusions are very important for rapid determination of CTC values.

[0075] The contents described in this specification are merely an enumeration of implementation forms of the inventive concept, and the protection scope of the present invention should not be considered as being limited to the specific forms described in the embodiments.

Claims

1. A portable activated carbon CTC value detection device capable of accurate measurement, characterized in that The invention comprises an air drying component, a flow meter (4), an organic vapor bubbling bottle (5), an absorption tube (7), an electronic balance (9) and a computer (11); the organic vapor bubbling bottle (5) contains carbon tetrachloride, the absorption tube (7) is filled with activated carbon, the air drying component is used to dry the air and convey it to the flow meter (4), the gas flow rate is controlled by the flow meter (4) and then the air is bubbled into the carbon tetrachloride liquid in the organic vapor bubbling bottle (5) through a pipeline, the gas flowing out of the organic vapor bubbling bottle (5) carries the carbon tetrachloride vapor and passes into the lower part of the activated carbon in the absorption tube (7) for absorption, and the gas discharged from the absorption tube (7) is subjected to tail gas treatment; the electronic balance (9) is used to record the mass change of the absorption tube (7) in real time and store the mass change data in the computer (11); the organic vapor bubbling bottle (5) and the absorption tube (7) are both provided with a precise temperature control system for controlling the temperature of the outer wall thereof, so as to precisely control the ambient temperature of the organic vapor bubbling bottle (5) and the absorption tube (7) respectively.

2. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that The organic vapor bubbling bottle (5) and the absorption tube (7) are both made of metal materials such as stainless steel and aluminum alloy.

3. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that The precise temperature control system comprises a semiconductor refrigeration sheet (6), an aluminum jacket (13) and a PLC controller. The bottom of the aluminum jacket (13) is provided with two vertical cylindrical holes, one on the left and one on the right, near the side edge. A heating tube (12) is inserted into the hole. The bottom of the heating tube (12) is connected to a heating power source through a wire. The bottom of the aluminum jacket (13) is connected to the semiconductor refrigeration sheet (6) to cool it. The outer sides of the organic vapor bubbling bottle (5) and the absorption tube (7) are respectively covered with the aluminum jacket (13), and the junction between them is connected with a temperature sensor for monitoring the temperature of the bottle body or the outer wall of the absorption tube. The device transmits the monitored temperature to the corresponding PLC controller, and the heating power source connected to the corresponding heating tube (12) and the semiconductor refrigeration sheet (6) are also respectively connected to the PLC controller signal, and the temperature of the bottle body of the organic vapor bubbling bottle (5) or the outer wall of the absorption tube (7) is automatically controlled by the PLC controller. When the temperature is higher than the set temperature, the semiconductor refrigeration sheet (6) starts to work for cooling and the heating tube (12) stops working. When the temperature is lower than the set temperature, the semiconductor refrigeration sheet (6) stops cooling and the heating tube (12) starts to work for heating, so that the temperature of the bottle body of the organic vapor bubbling bottle (5) or the outer wall of the absorption tube (7) is maintained at the set temperature.

4. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 3, characterized in that The absorption tube (7) has a T-shaped cross section and comprises an upper gas buffer tube and a lower filling tube (8), wherein one of the aluminum jackets (13) is provided with a tube groove matching the shape of the filling tube (8), and the filling tube (8) is fitted and embedded in the tube groove; the filling tube (8) is filled with the activated carbon.

5. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that The diameter of the absorption tube (7) where the activated carbon is filled is 1 to 3 cm, preferably 2 cm, the particle size of the activated carbon is 0.5 to 40 meshes, and the filling mass of the activated carbon is 1 to 3 g.

6. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that A gas distributor (16) is installed in the organic steam bubbling bottle (5), and a pipeline at the outlet of the flow meter (4) is passed to the bottom of the carbon tetrachloride liquid in the organic steam bubbling bottle (5) and connected to the gas distributor (16), so that the size of the bubbles is uniform and the error caused by the change of bubble size due to air flow fluctuation is reduced; the organic steam bubbling bottle (5) is also provided with a liquid level meter (15) for monitoring the liquid level inside it.

7. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that An air outlet pipe is arranged at the top of the organic steam bubbling bottle (5), and a water-absorbing cotton (14) is arranged at the inlet of the air outlet pipe to prevent the bubbling bubbles from carrying carbon tetrachloride micro-droplets out and flowing into the subsequent activated carbon. The outlet of the air outlet pipe is connected to the lower part of the absorption pipe (7) through a pipeline, and the gas carrying carbon tetrachloride vapor is passed into the bottom of the activated carbon.

8. A portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that The air drying component comprises an air pump (1), a silica gel drying tube (2), an anhydrous calcium chloride drying tube (3) and a buffer bottle which are connected in sequence by pipelines, and the buffer bottle is further connected to the flow meter (4) through a pipeline.

9. A detection method for a portable activated carbon CTC value detection device capable of accurate measurement as claimed in claim 1, characterized in that The gas is dried and dehydrated by an air drying component, and the dried gas is driven into an organic vapor bubbling bottle for bubbling, carrying carbon tetrachloride vapor into an absorption tube for adsorption. The absorption tube (7) is placed on an electronic balance (9) to monitor the mass change of the absorption tube in real time. The activated carbon adsorption rate calculation formula is programmed into a computer (11), and the activated carbon adsorption rate is observed in real time on the computer (11). When the activated carbon adsorption rate does not change within 10-20 seconds, it can be regarded as adsorption saturation. The carbon tetrachloride gas that is not completely adsorbed is treated by an exhaust gas absorption bottle to prevent the test personnel from inhaling carbon tetrachloride and being poisoned.

10. The detection method according to claim 9, characterized in that Input the empty tube mass m1 of the absorption tube into the computer, take a certain amount of activated carbon test sample that meets the drying requirements and fill it into the absorption tube, and weigh the total mass m2 of the absorption tube and the unventilated activated carbon test sample, and transmit the total mass of the absorption tube and the unventilated activated carbon test sample to the computer through the data line connecting the electronic balance to the computer. Connect the absorption tube to the organic vapor bubbling bottle, dry and remove water from the gas through the air drying component, and drive the dried gas into the organic vapor bubbling bottle for bubbling, carrying carbon tetrachloride vapor into the absorption tube for adsorption, until the digital display of the electronic balance does not change within 10-20 seconds to determine adsorption saturation, after adsorption saturation, the electronic balance transmits the adsorption saturation mass m3 to the computer, and calculates the carbon tetrachloride adsorption rate of activated carbon according to the formula for calculating carbon tetrachloride adsorption rate programmed into the computer; calculate the adsorption mass fraction of carbon tetrachloride by the activated carbon according to the following formula:

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