CN108982281B - Method and system for evaluating performance of adsorbing VOCs (volatile organic compounds) by using coke breeze based on entrained flow - Google Patents
Method and system for evaluating performance of adsorbing VOCs (volatile organic compounds) by using coke breeze based on entrained flow Download PDFInfo
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Abstract
The invention relates to a method and a system for evaluating the performance of absorbing VOCs (volatile organic compounds) by coke breeze based on an entrained flow bed, wherein the system at least comprises the following components: a feed system for providing coke breeze; a temperature control and heat preservation system; the pipeline type adsorption reactor is positioned in the temperature control and heat preservation system, and is provided with a sampling port and connected with the feeding system; the system comprises a plurality of gas cylinders for containing the adsorbate gas, an instrument for controlling the flow of the gas cylinders, a VOCs vapor generation device and corresponding gas path pipelines which are connected in sequence, wherein the adsorbate gas generation system is connected with the pipeline type adsorption reactor; and a gas-solid separation device for separating the coke breeze and the adsorbate gas. The system is adopted to carry out a coke breeze adsorption test, the obtained coke sample is tested and analyzed, and the coke breeze adsorption rate is calculated according to the change of the adsorption quantity of VOCs of the coke sample, so that the performance of adsorbing VOCs of the coke breeze is evaluated.
Description
Technical Field
The disclosure belongs to the field of environmental protection, and particularly relates to a method and a system for evaluating performance of adsorbing VOCs (volatile organic compounds) by using coke breeze based on an entrained flow bed.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
VOCs (volatile organic compounds) are a common type of atmospheric pollutants mainly derived from waste gas discharged from factories, and mainly comprise acetone, toluene, phenol, dimethylaniline, formaldehyde, n-hexane, ethyl acetate, ethanol and the like. VOCs are key precursors formed by PM2.5 and ozone, have physiological toxicity and great harm to the environment and human health. Therefore, it is important for the control of VOCs.
The activated coke/carbon is a carbonaceous adsorption material with rich pore structures and huge specific surface area, has the characteristics of strong adsorption capacity, good chemical stability, high mechanical strength, convenient regeneration and the like, and VOCs can obtain better purification effect through activated carbon adsorption. The active coke/carbon applied in industrial production and life is generally granular or columnar active coke with the diameter of 5-9 mm, the manufacturing process is complex, the price is high, the mechanical loss is large, and the popularization and the application of the active coke are limited. The applicant proposed in "a process and an apparatus for rapidly preparing powdered activated coke for desulfurization using pulverized coal" with patent number CN103224235A, which can use power plant in-situ pulverized coal as raw material, and hot flue gas as reaction medium, and realize rapid preparation of powdered activated coke in an upward fluidized bed, and the preparation technology greatly reduces the preparation cost of activated coke. The powdery active coke also has a complex pore structure and a higher specific surface area, and can be used for adsorbing and removing various gas-phase pollutants; meanwhile, the coke breeze has smaller average particle size, can be better mixed and contacted with adsorbates in the adsorption process, greatly improves mass transfer conditions, and is superior to granular active coke/carbon in the performances of adsorption rate and the like. The fixed bed type adsorber for evaluating the adsorption performance of the traditional granular activated coke, which is known by the inventor, is mainly used for testing the adsorption capacity of the activated coke in a period of time, and the adsorption rate of the activated coke is difficult to measure due to the fact that the influence of external diffusion cannot be eliminated, so that the adsorption performance of the powdery activated coke cannot be comprehensively evaluated. Therefore, the traditional evaluation method aiming at the adsorption performance of the granular activated coke is not suitable for the powdery activated coke, and an evaluation system aiming at the adsorption performance of the powdery activated coke needs to be invented.
Disclosure of Invention
In order to solve the problems, the disclosure provides a method and a system for evaluating the performance of adsorbing the VOCs by the powdery active coke based on a pipeline type entrained flow, which can be used for testing the change of the adsorption rate of the powdery active coke with different coal types and different particle sizes under the entrainment of adsorbate airflows with different concentrations along with the time.
The technical scheme adopted by the disclosure is as follows:
first, in one or some embodiments of the present disclosure, a reaction system for fluidized adsorption of VOCs by coke breeze is provided, which at least includes:
a feed system for providing coke breeze;
a temperature control and heat preservation system;
the pipeline type adsorption reactor is positioned in the temperature control and heat preservation system, and is provided with at least two sampling ports and is connected with the feeding system;
the system comprises a plurality of gas cylinders for containing the adsorbate gas, an instrument for controlling the flow of the gas cylinders, a VOCs vapor generation device and corresponding gas path pipelines which are connected in sequence, wherein the adsorbate gas generation system is connected with the pipeline type adsorption reactor; and
a gas-solid separation device for separating the coke breeze and the adsorbate gas.
Secondly, in one or some embodiments of the present disclosure, a method for evaluating performance of coke breeze adsorbing VOCs is provided, which includes the following steps:
the method comprises the steps of simultaneously introducing powdery active coke and adsorbate gas carrying VOCs into a pipeline type adsorption reactor, adsorbing the VOCs by the powdery active coke under the conditions of setting adsorption temperature and setting adsorbate concentration, respectively obtaining samples obtained by sampling ports and the time of obtaining the samples by the sampling ports, detecting the quality of adsorbing the VOCs by the samples of different sampling ports, obtaining the quality difference value of adsorbing the VOCs by the samples according to the two sampling ports and the time difference value of obtaining the samples by the two sampling ports, and obtaining the speed of adsorbing the VOCs by the powdery active coke in an area between the two sampling ports.
The beneficial effects that this one of them technical scheme of this disclosure obtained are as follows:
by utilizing the entrained-flow bed-based adsorption reaction system and the corresponding evaluation method for the performance of adsorbing VOCs by the coke breeze, the rate of adsorbing VOCs by the active coke under different working conditions in the fluidized adsorption process can be obtained, and the change curve of the rate of adsorbing VOCs by the active coke under different working conditions in the fluidized adsorption process along with the adsorption time can be drawn, so that the adsorption performance of the coke breeze is visually evaluated, and technical support is provided for the application in industrial production and life.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and, together with the description, serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a system schematic of one or some embodiments of the present disclosure;
FIG. 2 is a block diagram of a serpentine adsorption reactor;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a bottom view of FIG. 2;
wherein, 1, a high-purity nitrogen bottle; 2. a high-purity oxygen cylinder; 3. a high purity carbon dioxide cylinder; 4. a mass flow controller; 5. a toluene vapor generation device; 6. a peristaltic pump; 7. a reagent bottle; 8. toluene; 9. a micro screw feeder; 10. coke breeze; 11. a coiled pipe adsorption reactor; 12. a storage bin; 13. a gas heater; 14. an adsorbate gas inlet; 15. a feeding port; 16. a venturi tube; 17. an adsorption reactor main body conduit; 18. a reducer pipe; 19. a T-shaped three-way valve; 20-29, a sampling port; 30. heating furnace; 31. a micro swirler; 32. a material receiving bottle; 33. tail gas; 34. and (5) a gas washing bottle.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
The coke breeze and the powdered activated coke in the present disclosure have the same meaning.
VOCs in this disclosure refers to one or more mixed volatile organic compounds.
As described in the background section, the present inventors have recognized certain deficiencies in methods and systems for evaluating the adsorption performance of powdery activated coke on VOCs using conventional fixed bed adsorbers for granular activated coke, and in view of the above, in one or more exemplary embodiments of the present disclosure, a reaction system for fluidized adsorption of VOCs from coke breeze is provided, which comprises:
a feed system for providing coke breeze;
a temperature control and heat preservation system;
the pipeline type adsorption reactor is positioned in the temperature control and heat preservation system, and is provided with at least two sampling ports and is connected with the feeding system;
the system comprises a plurality of gas cylinders for containing the adsorbate gas, an instrument for controlling the flow of the gas cylinders, a VOCs vapor generation device and corresponding gas path pipelines which are connected in sequence, wherein the adsorbate gas generation system is connected with the pipeline type adsorption reactor; and
and the gas-solid separation device is connected with the sampling port and is used for separating the coke breeze and the adsorbate gas.
In one or some embodiments of the present disclosure, the coke breeze fluidized adsorption reaction system further comprises a tail gas treatment device.
In one or some embodiments of the disclosure, the system for generating adsorbate gas further comprises a reagent bottle for containing VOCs and a peristaltic pump, wherein the reagent bottle is connected with the VOCs vapor generation device through the peristaltic pump, and the peristaltic pump sucks VOCs from the reagent bottle to provide stable flow of VOCs for the VOCs vapor generation device.
In one or more embodiments of the present disclosure, the VOCs vapor generation device is a cylindrical metal shell, the heating mode is heating by an electric heating wire, the thermal storage ceramic is filled in the device, and VOCs delivered by a peristaltic pump are dripped on the surface of the thermal storage ceramic in a glowing state, i.e., are instantaneously evaporated into VOCs vapor.
In the present disclosure, the specific structure of the feeding system is not particularly limited, and the feeding system may be used for feeding coke breeze. In one or some embodiments of the present disclosure, the feeding system includes a screw feeder and associated gas path piping for feeding and/or preheating the coke breeze.
In one or some embodiments of the disclosure, the temperature control and insulation system comprises the VOCs vapor generation device, the gas heater and the pipeline adsorption reactor which are connected in series in sequence. Wherein, the VOCs vapor generation device has the function of mixed gas at the same time.
Wherein, the gas heater is a device capable of heating the mixed gas.
In other embodiments, the VOCs vapor generation device may also be located outside of the temperature-controlled holding system.
In one or some embodiments of the present disclosure, the main body of the temperature control and preservation system is a heating furnace, and is used for preheating the adsorbate gas and controlling the temperature of the pipeline adsorption reactor. Heating means for the furnace include, but are not limited to, resistance wire air radiant heating.
Furthermore, the heating furnace internally comprises the VOCs vapor generation device, the gas heater and the pipeline type adsorption reactor which are sequentially connected in series.
Furthermore, the heating furnace comprises a heat-insulating shell layer outside, and the heat-insulating shell layer is a light mullite fiber heat-insulating plate.
In one or some embodiments of the present disclosure, the pipeline-type adsorption reactor is a serpentine single-pass pipeline (or called serpentine adsorption reactor) composed of a plurality of vertical pipes, elbows and T-shaped three-way valves, an inlet of the pipeline-type adsorption reactor is composed of an adsorbate gas inlet and a powdery active coke feeding port (i.e., a feeding port 15 in the figure), each T-shaped three-way valve corresponds to a sampling port, and the sampling port is connected to a gas-solid separation device.
Furthermore, the outlet of the snake-shaped single-way pipeline also corresponds to a sampling port.
Furthermore, the adsorbate gas inlet and the powdery active coke feeding port are connected with a main pipeline of the pipeline type adsorption reactor through a Venturi tube.
Furthermore, in order to prevent the powdery active coke from blocking the pipeline and influencing the detection accuracy, the lower part of the vertical pipe is provided with a reducing pipe with a reducing structure.
Furthermore, in order to conveniently control the sampling time of the sampling ports, the distances between the adjacent sampling ports are equal.
The gas cylinder comprises but is not limited to a high-purity nitrogen cylinder, a high-purity oxygen cylinder and/or a high-purity carbon dioxide cylinder and the like, and the type of gas in the gas cylinder can be determined according to the specific working condition to be simulated.
The coiled pipe adsorption reactor adopted by the method belongs to a laboratory-scale device, is low in construction cost and low in requirement on site space, and provides a method with high feasibility for evaluating the fluidized adsorption performance of the coke breeze.
In one or some embodiments of the present disclosure, the instrument for controlling the flow of the gas cylinder is a mass flow controller or a rotameter.
In one or more embodiments of the present disclosure, the gas-solid separation device is used for primary separation of adsorbate gas and coke breeze, and the main body is a cyclone, and a gas outlet of the cyclone is connected with the tail gas treatment device.
In one or some embodiments of the present disclosure, the tail gas treatment device is used for secondary separation of coke breeze and adsorbate gas and absorption of contaminants in the adsorbate gas.
Further, the tail gas treatment device is a gas washing bottle for containing an absorbent.
In one or some embodiments of the present disclosure, a fluidized adsorption reaction system for coke breeze is provided, which includes an adsorbate gas generation system, a feeding system, a temperature control and heat preservation system, a pipeline adsorption reactor, a gas-solid separation device and a tail gas treatment device; wherein, the gas path pipeline outlet of the adsorbate gas generation system is connected with the gas inlet of the pipeline type adsorption reactor; the feeding system main body is a screw feeder, and a discharge port is connected with a material inlet of the pipeline type adsorption reactor; the main body of the temperature control and heat preservation system is a heating furnace, and a gas preheater, a VOCs steam generating device and a pipeline type adsorption reactor are integrated in the furnace; the sampling port of the pipeline type adsorption reactor is connected with a gas-solid separation device; the gas-solid separation device main body is a cyclone, and a gas outlet of the cyclone is connected with a tail gas treatment device. The system is adopted to carry out a coke breeze adsorption test, the obtained coke sample is tested and analyzed, and the coke breeze adsorption rate is calculated according to the change of the adsorption quantity of VOCs of the coke sample, so that the performance of adsorbing VOCs of the coke breeze is evaluated.
In another or some exemplary embodiments of the present disclosure, there is provided a method for evaluating performance of coke breeze adsorbing VOCs, comprising the steps of:
the method comprises the steps of simultaneously introducing powdery active coke and adsorbate gas carrying VOCs into a pipeline type adsorption reactor, adsorbing the VOCs by the powdery active coke under the conditions of setting adsorption temperature and setting adsorbate concentration, respectively obtaining samples obtained by sampling ports and the time of obtaining the samples by the sampling ports, detecting the quality of adsorbing the VOCs by the samples of different sampling ports, obtaining the quality difference value of adsorbing the VOCs by the samples according to the two sampling ports and the time difference value of obtaining the samples by the two sampling ports, and obtaining the speed of adsorbing the VOCs by the powdery active coke in an area between the two sampling ports.
The method adopts a mode that high-speed adsorbate airflow carries trace powdery active coke, and realizes the control of adsorption time by controlling the length of an adsorption reaction tube in a pipeline type adsorption reactor under the condition of extremely low powdery active coke equivalent ratio in the atmosphere with constant adsorbate concentration, thereby calculating the adsorption rate of the active coke after the influence of external diffusion is eliminated.
In one embodiment of the present disclosure, the particle size of the coke breeze ranges from 20 to 500 μm.
In a specific embodiment of the present disclosure, in order to better evaluate the performance of adsorbing VOCs by coke breeze, the sampling ports for obtaining samples are all the sampling ports of the pipeline adsorption reactor, the average adsorption rate of VOCs in a corresponding section is calculated according to the mass difference value of the samples sampled and adsorbed by adjacent sampling ports and the time difference value of the samples obtained by adjacent sampling ports, and the time-dependent change curve of the rate of adsorbing VOCs by active coke is drawn according to the average adsorption rate of VOCs in different sections. The most adsorption rate calculations were obtained using adjacent sample ports.
In a specific embodiment of the present disclosure, in order to improve the detection accuracy, the equivalent ratio of active coke in the pipeline adsorption reactor is 0.08-0.12, where the equivalent ratio of active coke refers to the ratio of the mass of the powdery active coke entering the pipeline adsorption reactor per unit time to the mass of the powdery active coke which can completely adsorb the adsorbate entering the pipeline adsorption reactor per unit time and just reaches the adsorption saturation.
In a specific embodiment of the present disclosure, the powdered activated coke is sieved to obtain powdered activated coke with different particle sizes, the powdered activated coke with a specific particle size range is selected, and the powdered activated coke with the selected particle size is input into the pipeline type adsorption reactor.
In a specific embodiment of the present disclosure, the gas velocity is 4 to 16 m/s.
In a specific embodiment of the present disclosure, the adsorption temperature is set to 100 to 150 ℃. The concentration of the adsorbate can be set according to specific working conditions.
In a specific embodiment of the present disclosure, a method for evaluating performance of coke breeze adsorbing VOCs specifically includes the following steps:
(1) screening powdery active coke to be detected to obtain coke breeze particles with different particle sizes;
(2) performing an adsorption test on the coke breeze with the selected particle size under the conditions of set adsorption temperature and set adsorbate concentration, and respectively obtaining a sample obtained by a sampling port and the time for obtaining the sample by the sampling port; wherein, the adsorption temperature is set by a temperature control and heat preservation system and a gas heater, and the concentration of adsorbate is prepared by each gas cylinder;
(3) putting the obtained sample into an organic solvent, completely dissolving the VOC adsorbed in the sample into the organic solvent, separating the solid, then measuring the concentration of VOCs in the organic solvent, and calculating the adsorption capacity of the VOCs in the sample; calculating the average adsorption rate of VOCs in the corresponding section according to the difference value of the adsorption quantity of VOCs of the samples obtained by the adjacent sampling ports and the discharge time difference of the adjacent material taking ports, wherein the calculation formula is as follows:
in the formula:
Vn: average adsorption rate of coke breeze VOC in the nth adsorption section, unit: mg/(g · s);
note: n represents a positive integer, and the value of n can be determined by a person skilled in the art according to actual conditions;
S1: VOC adsorption capacity of unit mass sample at the front end of the target section, unit: mg;
S2: VOC adsorption capacity per unit mass of sample at the rear end of the target section, unit: mg;
t1: discharge time at the front end of the target section, unit: s;
t2: discharge time at the rear end of the target section, unit: s;
(4) according to the working condition selected in the step (2) and the data obtained in the step (3), drawing a change curve of the adsorption rate of the powdery active coke on the VOCs along with the adsorption time under different working conditions; or, under a certain specific working condition, coke breeze with different properties is adopted to carry out an adsorption test, and the influence of the pore structure and the surface chemical property of the powdery active coke on the adsorption rate is researched.
In one or some embodiments of the present disclosure, the particle size of the coke breeze ranges from 20 to 500 μm.
In the present disclosure, the working condition refers to the working state of the coke breeze in practical application, and includes the flue gas temperature of the VOCs and the composition of the gas in the environment; wherein, the flue gas temperature accessible accuse temperature heat preservation system realizes, and gaseous composition accessible gas cylinder is prepared, realizes simulating the operating mode of powdered coke through above operation.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Example 1
With the attached drawings of 1-4, the reaction system for fluidized adsorption of VOCs by coke breeze comprises an adsorbate gas generation system, a feeding system, a temperature control and heat preservation system, a coiled pipe adsorption reactor, a gas-solid separation device and a tail gas treatment device.
The adsorbate gas generation system comprises gas cylinders (a high-purity nitrogen gas cylinder 1, a high-purity oxygen gas cylinder 2 and a high-purity carbon dioxide gas cylinder 3), a mass flow controller 4 and a toluene vapor generation device 5 which are sequentially connected by a polytetrafluoroethylene tube or a silicone tube, and toluene is sucked from a reagent bottle 7 by a peristaltic pump 6 to provide toluene with stable flow for the toluene vapor generation device 5.
The toluene vapor generating device 5 is a cylindrical metal shell, is heated by an electric heating wire, is internally provided with a proper amount of heat storage ceramic, and the toluene delivered by the peristaltic pump 6 is dripped on the surface of the heat storage ceramic in a glowing state, namely is instantaneously evaporated into toluene vapor.
The main body of the feeding system is a micro screw feeder 9 which is used for feeding coke breeze 10 into a coiled pipe adsorption reactor 11 according to a certain feeding rate, and the feeding system is provided with a fully sealed bin 12 so as to realize positive pressure feeding.
The temperature control and heat preservation system is composed of a heating furnace 30, and the size of a heating inner cavity is as follows: 0.4 x 0.6 x 3 m, the heating mode is resistance wire air radiation type heating, and a light mullite fiber heat-insulating plate is adopted as a shell for heat insulation; the interior of the heating furnace is connected with a toluene steam generating device 5, a gas heater 13 and a coiled pipe adsorption reactor 11 in series in sequence.
The structure of the coiled pipe adsorption reactor 11 is shown in attached figures 2-4, the whole reactor is made of 316L stainless steel, and is 2.36m high, 0.5m long and 0.26m wide; the adsorbate gas flows through a gas heater 13 and is heated to the temperature required by the adsorption reaction, enters from an adsorbate gas inlet 14, carries with coke breeze 10 entering from a feeding port 15, is mixed by a venturi tube 16 and then enters into a main pipeline 17 of the adsorption reactor; the main pipelines of the reactor are 23 vertical pipes with the inner diameter of 20mm, the reducer pipe 18 is arranged for preventing coke breeze from accumulating at the bottom of the reactor, and the inner diameter of the lower elbow is 8 mm; each vertical pipe is 2m high, 46m in total length (without elbow), 9T-shaped three-way valves 19 are arranged along the way, and 10 sampling ports 20-29 are correspondingly arranged.
The main body of the gas-solid separation device is a micro cyclone 31 which is sequentially connected with 10 sampling ports 20-29, the adsorbate gas and the coke breeze 10 from the sampling ports are separated, the separated coke breeze falls into a material receiving bottle 32, and the unseparated coke breeze and tail gas 33 enter a gas washing bottle 34 filled with commercial active carbon for further absorption treatment.
Example 2
With reference to the attached drawings 1-4, the evaluation method for the performance of absorbing VOCs by coke breeze comprises the following steps:
firstly, a preparation part:
(1) screening powdery active coke to be detected to obtain coke breeze particles with different particle sizes (50-200 mu m);
(2) pouring coke breeze with a certain particle size to be detected into a bin 12 of the micro screw feeder 9, opening a feeder motor, and calibrating the feeding amount (10 g/h);
(3) and (3) turning on power supplies of the toluene steam generating device 5 and the air preheater 13, turning on the peristaltic pump 6 to set toluene flow and turning on each gas cylinder to prepare adsorbate gas after the temperature reaches a set value: the concentration (O) of each component in the adsorbate gas is required according to different working conditions2：6％；CO2: 12 percent; toluene: 1000mg/m3；N2: balance gas), the opening degree of each mass flowmeter 4 is set;
(4) opening a heating power supply of the heating furnace 30, connecting the discharge port of the feeder and the gas path outlet of the adsorbate gas with the inlet (the adsorbate gas inlet 14 and the feed inlet 15) of the reactor after the temperature reaches a set value, and introducing the adsorbate gas;
(5) and opening a motor of the feeding machine to perform an adsorption experiment.
II, experiment part:
(1) the micro cyclone 31, the receiving bottle 32 and the washing bottle 34 are connected by a silica gel tube, and sampling is carried out in sequence according to the serial number of the sampling ports;
(2) before sampling, replacing silicone tubes between the sampling ports 20-29 and the micro cyclone 31, replacing commercial activated carbon (if the activated carbon is absorbed and saturated) in a gas washing bottle 34, and flushing the material receiving bottle 32 by using nitrogen;
(3) connecting the inlet of the micro cyclone 31 and the sampling ports 20-29, pulling the T-shaped three-way valve corresponding to the sampling ports 20-28 to a sampling state, pulling the three-way valve to an original state after enough samples are obtained, pouring the samples in the material receiving bottle 32 into a sampling bag, and repeating the steps (2) and (3) in sequence until the sampling work of 10 sampling ports 20-29 is completed;
(4) each sample sampling time is determined by calculation based on the feed amount, the separation efficiency of micro cyclone 31 and the required sample mass. After sampling is finished, closing the power supplies of the micro screw feeder 9, the peristaltic pump 6 and the toluene vapor generation device 5, switching the gas path to a pure nitrogen cleaning state, and continuously introducing nitrogen for more than 5 minutes after all coke breeze is blown out of the reactor 11, so as to ensure that no residual adsorbate gas exists in the coiled pipe adsorption reactor 11;
(5) and (4) turning off the heating power supply of the gas heater 13 and the heating furnace 30, turning off the gas cylinders, the computer and the power supply, and ending the experiment.
The adsorption time for the T-port three-way valve (i.e., corresponding sample port) sampling is shown in table 1:
TABLE 1 adsorption time for samples taken at each sampling port
Thirdly, a test analysis part:
(1) the sampling bag containing the sample is sealed and stored, and the related test experiment of the sample is completed as soon as possible.
(2) Putting a sample with unit mass (1.0g) into n-hexane with a certain volume, carrying out ultrasonic treatment to completely dissolve toluene adsorbed in the sample into the n-hexane, centrifuging, taking supernatant to measure the concentration of toluene in the n-hexane, and calculating the adsorption capacity of the toluene in the sample with unit mass. Calculating the average toluene adsorption rate in the corresponding section according to the toluene adsorption quantity difference of the samples obtained by the adjacent sampling ports and the discharge time difference of the adjacent material taking ports, wherein the calculation formula is as follows:
in the formula:
Vn: average adsorption rate of coke breeze toluene in the nth adsorption section, unit: mg/(g · s);
S1: toluene adsorption capacity per unit mass of sample at the front end of the target zone, unit: mg;
S2: toluene adsorption capacity per unit mass of sample at the rear end of the target zone, unit: mg;
t1: discharge time at the front end of the target section, unit: s;
t2: discharge time at the rear end of the target section, unit: and s.
The above embodiments are preferred embodiments of the present disclosure, but the embodiments of the present disclosure are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present disclosure should be regarded as equivalent replacements within the scope of the present disclosure.
Claims (8)
1. An evaluation method for the ability of coke breeze to fluidized adsorb VOCs is characterized in that the evaluation method utilizes a VOCs coke breeze adsorption device, and the device at least comprises:
a feed system for providing coke breeze;
a temperature control and heat preservation system;
the pipeline type adsorption reactor is positioned in the temperature control and heat preservation system, and is provided with at least two sampling ports and is connected with the feeding system;
the system comprises a plurality of gas cylinders for containing the adsorbate gas, a plurality of instruments for controlling the flow of the gas cylinders, a VOCs vapor generation device and corresponding gas path pipelines which are connected in sequence, wherein the adsorbate gas generation system is connected with the pipeline type adsorption reactor; and a gas-solid separation device for separating the coke breeze and the adsorbate gas;
simultaneously introducing powdery active coke and adsorbate gas carrying VOCs into the pipeline type adsorption reactor, adsorbing the VOCs by the powdery active coke at a set adsorption temperature and a set adsorbate concentration, respectively obtaining samples obtained by the sampling ports and the time for obtaining the samples by the sampling ports, detecting the quality of the VOCs adsorbed by the samples of different sampling ports, obtaining the quality difference value of the VOCs adsorbed by the samples and the time difference value of the samples obtained by the two sampling ports according to the two sampling ports, and obtaining the speed of the VOCs adsorbed by the powdery active coke in the area between the two sampling ports;
the particle size range of the coke breeze is 20-500 mu m;
the equivalent ratio of active coke in the pipeline type adsorption reactor is 0.08-0.12;
the gas velocity is 4 to 16 m/s.
2. The method of claim 1, further comprising: the adsorbate gas generation system also comprises a reagent bottle for containing VOCs and a peristaltic pump, wherein the reagent bottle is connected with the VOCs vapor generation device through the peristaltic pump.
3. The method of claim 1, further comprising: the feeding system comprises a screw feeder and a related gas path pipeline.
4. The method of claim 1, further comprising: the interior of the temperature control and heat preservation system comprises a VOCs vapor generation device, a gas heater and a snake-shaped adsorption reactor which are sequentially connected in series;
the main body of the temperature control and heat preservation system is a heating furnace;
the heating furnace is characterized in that the heating furnace comprises a heat-insulating shell layer outside, and the heat-insulating shell layer is a light mullite fiber heat-insulating plate.
5. The method of claim 1, further comprising: the pipeline type adsorption reactor is a snake-shaped single-way pipeline consisting of a plurality of vertical pipes, an elbow and T-shaped three-way valves, the inlet of the pipeline type adsorption reactor is composed of an adsorbate gas inlet and a powdery active coke feeding port, each T-shaped three-way valve corresponds to a sampling port respectively, and the sampling ports are connected with a gas-solid separation device.
6. The method of claim 5, wherein: the adsorbate gas inlet and the powdery active coke feeding port are connected with a main pipeline of the pipeline type adsorption reactor through a venturi tube.
7. The method of claim 1, further comprising: the main body of the gas-solid separation device is a cyclone.
8. The method of claim 1, further comprising: the coke breeze fluidization adsorption reaction system also comprises a tail gas treatment device.
Priority Applications (1)
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