CN217092787U - Device for separating tail gas in carbon nano tube preparation process by multistage partial pressure type adsorption method - Google Patents
Device for separating tail gas in carbon nano tube preparation process by multistage partial pressure type adsorption method Download PDFInfo
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Abstract
The utility model relates to the technical field of carbon nanotube preparation, and discloses a device for separating tail gas in the preparation process of carbon nanotubes by a multistage partial pressure type adsorption method, which comprises a compressor and an adsorption separation system; the air inlet end of the compressor is communicated with the carbon nano cracking equipment through an exhaust gas pipeline, the air outlet end of the compressor is communicated with the air inlet end of the adsorption separation system, and a carbon source gas adsorbent is arranged in the adsorption separation system; the gas outlet end of the adsorption separation system comprises two paths, wherein one path is communicated with the hydrogen buffer tank through a hydrogen recovery pipeline, and the other path is communicated with the carbon source gas storage tank through a carbon source gas recovery pipeline; a vacuum pump is arranged on one end of the carbon source gas recovery pipeline close to the adsorption separation system; one end of the waste gas pipeline close to the carbon nano cracking equipment is provided with a micro-positive pressure one-way valve. The beneficial effects are that: the carbon source gas which is not cracked in the tail gas can be separated, the waste of hydrocarbon raw materials is avoided, and the cost for preparing the carbon nano tube is saved.
Description
Technical Field
The utility model relates to the technical field of carbon nanotube preparation, in particular to a device for separating tail gas in the carbon nanotube preparation process by a multistage partial pressure type adsorption method.
Background
The carbon nano tube is used as a one-dimensional nano material, has light weight, perfect connection of a hexagonal structure and a plurality of abnormal mechanical, electrical and chemical properties. With the research of carbon nanotubes and nanomaterials, the wide application prospect is continuously shown in recent years. Since the carbon nanotube has a hollow structure, it can be used as a micro mold. The metal, oxide and other substances can be filled in the nano-sized conductive wire, so that the finest nano-sized conductive wire and the like can be prepared and used in future molecular electronic devices or nano-electronic devices. It can also be used to make carbon nanotube reinforced plastics, carbon nanotube reinforced ceramic composite material, metal-based composite material, and can also be used to make the finest test tube and the nano-scale capable of weighing single atomic mass.
Carbon nanotubes, also known as buckytubes, are the finest fibers recognized in the world, and are one-dimensional quantum materials with special structures (the radial dimension is nanometer magnitude, the axial dimension is micrometer magnitude, and both ends of the tube are basically sealed). The carbon nanotube mainly comprises a coaxial circular tube with several layers to tens of layers formed by carbon atoms arranged in a hexagon, and can be regarded as formed by curling graphene sheets, so that the carbon nanotube can be divided into the following layers according to the number of the graphene sheets: single-walled Carbon nanotubes (or Single-walled Carbon nanotubes, SWCNTs) and Multi-walled Carbon nanotubes (or Multi-walled Carbon nanotubes, MWCNTs) are formed, and when a Multi-walled tube is initially formed, the layers of the Multi-walled tube easily become trap centers to trap various defects, so that the walls of the Multi-walled tube are usually filled with small hole-like defects. Compared with a multi-wall pipe, the single-wall pipe has the advantages of small diameter distribution range, less defects and higher uniformity. The typical diameter of the single-wall pipe is 0.6-2nm, the innermost layer of the multi-wall pipe can reach 0.4nm, the thickest layer can reach hundreds of nanometers, but the typical pipe diameter is 2-100 nm. Carbon hexagons can be classified according to their different orientations in the axial direction: three types are a sawtooth shape, an armchair shape and a spiral shape. Wherein the helical carbon nanotubes have chirality, while the zigzag and armchair carbon nanotubes have no chirality; the materials have good conductivity, high mechanical property and high specific surface area, and play an important role in the technical field of renewable energy conversion such as electrochemical catalysis and energy storage.
At present, the macro preparation method of the carbon nano tube is mainly a catalytic cracking chemical vapor deposition method (called catalytic cracking method), which is a method for preparing the carbon nano tube by decomposing gas raw materials containing hydrocarbon (such as methane, ethylene, propylene, benzene and the like) at the temperature of 600-1000 ℃ under the action of a catalyst. The method comprises cracking hydrocarbon at high temperature into carbon atom and hydrogen atom, wherein the carbon atom is attached to the surface of catalyst particle under the action of transition metal-catalyst to form carbon nanotube; the hydrogen atoms become hydrogen gas and the uncracked hydrocarbon gas is discharged as a tail gas. Due to the restriction of the existing cracking equipment, only 25% of hydrocarbon gas is cracked to generate carbon nanotubes and hydrogen in the preparation process of the carbon nanotubes, 75% of carbon source gas is not cracked to become tail gas to be discharged, so that the environment is polluted, hydrocarbon raw materials are wasted, and the cost for preparing the carbon nanotubes is increased.
Therefore, the device for separating the tail gas in the carbon nano tube preparation process by the multistage partial pressure type adsorption method is provided, the gas-gas separation is carried out by the special adsorbent capable of adsorbing the gas, the carbon source gas which is not cracked in the tail gas is separated, the waste of hydrocarbon raw materials is avoided, and the cost for preparing the carbon nano tube is saved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming, a device of tail gas in the preparation process of multistage partial pressure formula adsorption separation carbon nanotube is provided, can utilize the adsorbent to separate the tail gas in the carbon nanotube preparation process, separate out the carbon source gas of not schizolysis in the tail gas, waste hydrocarbon raw and other materials have been avoided, practice thrift the cost of preparing carbon nanotube, and can ensure that carbon nanotube schizolysis atmosphere does not receive the interference of tail gas separation part work, and be applicable to the tail gas separation of different catalysts and different carbon source gas preparation various carbon nanotube in-process.
The purpose of the utility model is realized through the following technical scheme:
the device for separating tail gas in the preparation process of the carbon nano tube by the multistage partial pressure type adsorption method is characterized in that:
comprises a compressor and an adsorption separation system;
the air inlet end of the compressor is communicated with the carbon nano cracking equipment through an exhaust gas pipeline, the air outlet end of the compressor is communicated with the air inlet end of the adsorption separation system, and a carbon source gas adsorbent is arranged in the adsorption separation system;
the gas outlet end of the adsorption separation system comprises two paths, wherein one path is communicated with the hydrogen buffer tank through a hydrogen recovery pipeline, and the other path is communicated with the carbon source gas storage tank through a carbon source gas recovery pipeline;
a micro-positive pressure one-way valve is arranged at one end of the waste gas pipeline close to the carbon nano cracking equipment; and a vacuum pump is arranged at one end of the carbon source gas recovery pipeline close to the adsorption separation system. The tail gas enters the adsorption separation system after passing through the micro-positive pressure one-way valve, and the micro-positive pressure of the tail gas generated by the carbon nano tube cracking equipment is utilized, so that the micro-positive pressure one-way valve is opened, zero interference on the original carbon nano tube cracking equipment process can be realized, and the atmosphere of the tail gas separation system can be prevented from overflowing; in addition, the scheme can realize the process of preparing different carbon nano tubes by controlling and adjusting the pressure of the micro-positive pressure one-way valve.
Furthermore, a one-way valve I is arranged at one end, close to the adsorption and separation system, of the hydrogen recovery pipeline, and a one-way valve II is arranged at one end, close to the adsorption and separation system, of the carbon source gas recovery pipeline.
Further, the adsorption separation system comprises one-stage to four-stage adsorption separation towers connected in parallel; the compressor is communicated with the tail gas inlet end at the bottom of the first-to-fourth-stage adsorption separation tower respectively, and four pipelines communicated with the compressor of the first-to-fourth-stage adsorption separation tower are respectively provided with a tail gas inlet valve;
the vacuum pump is respectively communicated with a carbon source gas separation outlet at the bottom of the first-to-fourth-stage adsorption separation tower, and four pipelines communicated with the vacuum pump of the first-to-fourth-stage adsorption separation tower are respectively provided with a desorption valve;
the hydrogen buffer tank is respectively communicated with four hydrogen separation outlets at the top of the first-to-fourth-stage adsorption separation tower, and a hydrogen output valve is respectively arranged on four pipelines respectively communicated with the first-to-fourth-stage adsorption separation tower and the hydrogen buffer tank.
Furthermore, the tail gas inlet valves of the first-fourth-stage adsorption separation tower are respectively connected with the corresponding desorption valves in an interlocking manner.
Furthermore, the tail gas inlet valve, the hydrogen output valve and the desorption valve are respectively provided with a pressure sensor, wherein the sensing end of the pressure sensor of the desorption valve is arranged inside the corresponding adsorption separation tower.
Furthermore, on the waste gas pipeline, still be equipped with one-level tail gas buffer tank between pressure-fired check valve and the compressor, still be equipped with second grade tail gas buffer tank between compressor and the adsorption separation system.
Furthermore, on the carbon source gas recovery pipeline, a first-stage buffer tank, a booster pump and a second-stage buffer tank are further sequentially arranged at the rear end of the vacuum pump along the airflow direction, and the second-stage buffer tank is communicated with the carbon source gas storage tank.
The utility model has the advantages of it is following: (1) the separation scheme utilizes the characteristic that a special adsorbent has no adsorbability on hydrogen to separate tail gas in the preparation process of the carbon nano tube, thereby avoiding wasting hydrocarbon raw materials and saving the cost for preparing the carbon nano tube;
(2) the method disclosed by the scheme adopts a multistage partial pressure mode, and three pipelines are arranged at the bottom and the top of the adsorption separation tower; one path is a tail gas introduction pipeline, a one-way valve is arranged to limit the flow direction of gas flow, a compressor is arranged as tail gas introduction power, and tail gas is introduced into the adsorption separation tower; one path is a carbon source gas leading-out pipeline, a battery valve, a pressure sensor and a vacuum pump are arranged, the vacuum pump is used for sucking the carbon source gas to be separated from the adsorbent and leading the carbon source gas into a carbon source gas storage tank; one path is a hydrogen leading-out pipeline, a one-way valve is arranged to limit the flow direction of the gas flow, and a compressor is arranged at the rear end to lead the hydrogen into a storage tank, so that the process realizes continuous uninterrupted work, has zero interference on the front-section carbon nanotube cracking process, does not make any change or adjustment, and is beneficial to the use of new and old equipment;
(3) the reaction device is integrated, the structure is simple, and the tail gas separation in the process of preparing various carbon nano tubes by using different catalysts and different carbon source gases is realized by taking measures such as a one-way valve pressure value, a pressure sensor set value in the adsorption tower and the like; the device realizes continuous uninterrupted work by adopting multistage partial pressure type adsorption separation, is universal for one device, greatly enlarges the application range of the tail gas separation device in the production process of the carbon nano tube, and provides possibility for tail gas separation in the preparation process of preparing and separating carbon nano tubes with different specifications by the same device.
Drawings
FIG. 1 is a schematic view of the present invention;
in the figure, 1-micro positive pressure one-way valve, 1A-one-way valve I, 1B-one-way valve II, 2-first stage tail gas buffer tank, 3-carbon nano tube cracking equipment, 4-compressor, 5-second stage tail gas buffer tank, 6 a-tail gas inlet valve, 6B-hydrogen output valve, 6 c-desorption valve, 7-first stage adsorption and separation tower, 8-second stage adsorption and separation tower, 9-vacuum pump, 10-hydrogen buffer tank, 11-third stage adsorption and separation tower, 12-fourth stage adsorption and separation tower, 13-first stage buffer tank, 14-booster pump, 15-second stage buffer tank, 16-waste gas pipeline, 18-hydrogen recovery pipeline, 19-carbon source gas recovery pipeline.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.
Example 1
As shown in fig. 1, the apparatus for separating tail gas in the process of preparing carbon nanotubes by using a multistage partial pressure adsorption method comprises an adsorption separation system formed by connecting four stages of partial pressure adsorption separation towers, namely a first-stage adsorption separation tower 7, a second-stage adsorption separation tower 8, a third-stage adsorption separation tower 11, a fourth-stage adsorption separation tower 12 and the like in parallel, a compressor 4, a vacuum pump 9, a hydrogen buffer tank 10 and a micro-positive pressure check valve 1; the device utilizes the micro-positive pressure of tail gas generated by a carbon nano tube cracking device 3, opens a micro-positive pressure check valve 1, then the tail gas is pressurized and guided into first to fourth adsorption separation towers 7, 8, 11 and 12 by a compressor 4, a porous adsorbent with large specific surface area is arranged in each adsorption separation tower, the adsorbent does not adsorb hydrogen and adsorbs carbon source gas, the characteristic that the adsorbent does not adsorb hydrogen and adsorbs gas except hydrogen is utilized, thereby realizing the separation of hydrogen and other gases, the hydrogen enters a hydrogen buffer tank 10, the carbon source gas is adsorbed by the adsorbent, then the carbon source gas adsorbed by the adsorbent is desorbed by a vacuum pump 9, and the purpose of recovering the carbon source gas is achieved, wherein, the micro-positive pressure check valve 1 is arranged at one end of a waste gas pipeline 16 close to the carbon nano cracking device 3 and is used for preventing the tail gas from flowing back to the carbon nano cracking device 3 and influencing the cracking production process, in addition, the pressure value of the front-end micro-positive pressure one-way valve 1 can be controlled and adjusted to adapt to the system pressure of different carbon nanotube cracking equipment, and tail gas generated in the preparation process of different carbon nanotubes can be separated.
In the scheme, each stage of adsorption and separation tower is provided with a tail gas inlet end, a hydrogen separation outlet and a carbon source gas separation outlet, and the compressor 4 is positioned below the first-stage to fourth-stage adsorption and separation towers 7, 8, 11 and 12 and communicated with the tail gas inlet end of each stage of adsorption and separation tower; the air inlet end of the compressor 4 is communicated with the carbon nano cracking equipment 3 through an exhaust gas pipeline 16; the vacuum pump 9 is arranged at the lower part of the first to fourth stages of adsorption and separation towers 7, 8, 11 and 12, is respectively communicated with four carbon source gas separation outlets of the first to fourth stages of adsorption and separation towers 7, 8, 11 and 12, and is used for sucking and separating the carbon source gas adsorbed by the adsorbent and sending the carbon source gas into the carbon source gas first-stage storage tank 13, four pipelines communicated with the first to fourth stages of adsorption and separation towers 7, 8, 11 and 12 and the vacuum pump 9 are respectively provided with a desorption valve 6c, and the desorption valves 6c are used for preventing the gas in the towers from flowing to the carbon source gas storage tank when the pressure in each stage of adsorption and separation towers is lower than a set value.
Meanwhile, the four pipelines which lead the first to fourth-stage adsorption separation towers 7, 8, 11 and 12 and the vacuum pump 9 are firstly connected to one end of the carbon source gas recovery pipeline 19 together, and then lead the other end of the carbon source gas recovery pipeline 19 to the vacuum pump 9, the carbon source gas recovery pipeline 19 is provided with a check valve II 1B, and the check valve II 1B is used for preventing the carbon source gas from flowing back.
In the scheme, the hydrogen buffer tank 10 is arranged on the upper part of one to four stages of adsorption and separation towers 7, 8, 11 and 12 and is respectively communicated with four hydrogen separation outlets of one to four stages of adsorption and separation towers 7, 8, 11 and 12, hydrogen output valves 6b are respectively arranged on four pipelines of the one to four stages of adsorption and separation towers 7, 8, 11 and 12 which are respectively communicated with the hydrogen buffer tank 10, the four pipelines are commonly connected with one end of a hydrogen recovery pipeline 18 and are communicated with the hydrogen buffer tank 10 through the hydrogen recovery pipeline 18, and a one-way valve 1A is arranged on the hydrogen recovery pipeline 18 and is used for preventing gas in the hydrogen buffer tank 10 from flowing back into the adsorption and separation towers.
In this scheme, on carbon source gas recovery pipeline 19, in one-level buffer tank 13 rear, still be equipped with booster pump 14 and second grade buffer tank 15 in proper order, can be with leading-in second grade buffer tank 15 behind the carbon source gas pressurization of one-level buffer tank 13, do benefit to the follow-up carbon source gas storage tank of leading-in carbon source gas with carbon source gas.
In the scheme, a primary tail gas buffer tank 2 is also arranged between the micro-positive pressure one-way valve 1 and the compressor 4; a second-stage tail gas buffer tank 5 is further arranged between the compressor 4 and the adsorption separation system and at one end close to the compressor 4, the second-stage tail gas buffer tank 5 is respectively communicated with four pipelines from the first-stage adsorption separation tower to the fourth-stage adsorption separation tower 7, 8, 11 and 12, each pipeline is provided with a tail gas inlet valve 6a, and each tail gas inlet valve 6a, the hydrogen output valve 6b and the desorption valve 6c are correspondingly provided with a pressure sensor, wherein the pressure sensor sensing end of the desorption valve 6c is arranged in the corresponding adsorption separation tower and is used for detecting whether the adsorbent in the tower is saturated or not; the tail gas inlet valve 6a, the hydrogen output valve 6b and the desorption valve 6c are all set with a pressure range value (action value), and the opening of the corresponding valves can be controlled within the set pressure value range value.
In the scheme, the tail gas inlet valve 6a of each stage of adsorption and separation tower and the corresponding desorption valve 6c are in interlocking connection, for example, when the pressure in the first stage of adsorption and separation tower 7 reaches the set pressure value of the desorption valve 6, the carbon source gas adsorbed by the internal adsorbent is close to saturation, the tail gas inlet valve 6a of the first stage of adsorption and separation tower 7 is automatically closed, the desorption valve 6c at the bottom of the first stage of adsorption and separation tower 7 is opened, the vacuum pump 9 is started to desorb the gas adsorbed in the first stage of adsorption and separation tower 7, after the desorption is completed, the desorption valve 6c is closed, and then the tail gas inlet valve 6a interlocked with the desorption valve is opened, so that the adsorption and desorption of the first stage of adsorption and separation tower 7 are completed once.
In the scheme, the pressure range values of the tail gas inlet valve 6a and the hydrogen output valve 6b of the first-to-fourth-stage adsorption separation tower 7, 8, 11 and 12 are gradually increased along with the number of tower stages, so that the first-stage adsorption separation tower 7, the second-stage adsorption separation tower 8, the third-stage adsorption separation tower 11 and the fourth-stage adsorption separation tower 12 form a multi-stage partial pressure type adsorption separation tower system, the multi-stage partial pressure type adsorption separation tower system is designed in a step-by-step increasing partial pressure type mode, the device can adsorb and separate hydrogen and other gases in a multi-stage partial pressure type mode, and stable continuous adsorption and desorption are realized.
In the scheme, the pressure range value corresponding to the opening of the desorption valve 6c of each stage of adsorption and separation tower is set according to the pressure value when the adsorbent in each stage of adsorption and separation tower is adsorbed to be nearly saturated. Meanwhile, the opening pressure ranges of the hydrogen output valve 6b at the top of each separation tower and the tail gas introduction valve 6c at the bottom are the same, and within the setting range, the hydrogen output valve 6b and the tail gas introduction valve 6c are both in an opening state, and are both in a closing state when exceeding the setting range.
In the scheme, preferably, the pressure range value of the tail gas entering valve 6a of the first-stage separation and adsorption tower 7 is set to be 30-250 KPa, the corresponding second-stage adsorption and separation tower 8 is 250-500 KPa, the corresponding third-stage adsorption and separation tower 11 is 500-750 KPa, and the corresponding fourth-stage adsorption and separation tower 12 is 750-1000 KPa, so that the beneficial effects of realizing independent adsorption and desorption of each stage of adsorption and separation tower and continuously and uninterruptedly adsorbing and desorbing are achieved; meanwhile, the pressure range value of the hydrogen output valve 6b of the first-stage separation and adsorption tower 7 is set to be 30-250 KPa, the corresponding second-stage separation and adsorption tower 8 is 250-500 KPa, the third-stage separation and adsorption tower 11 is 500-750 KPa, the fourth-stage separation and adsorption tower 12 is 750-1000 KPa, and the beneficial effects are that: not only can realize that each grade of adsorption separation tower independently separates out hydrogen, but also can continuously and uninterruptedly separate out and collect hydrogen.
In this scheme, the pressure of second grade tail gas buffer tank 5 is higher than one-level tail gas buffer tank 2, and 5 pressures of second grade tail gas buffer tank are 30KPa ~ 1000KPa, and the buffer tank combines the setting of pressure-fired check valve 1, further ensures this device can be when guaranteeing not disturbing the pressure of front end carbon nanotube schizolysis environment, can improve the adsorption separation efficiency through the pressure boost again.
In the scheme, the absorbent is a KTS-1 microcrystalline material produced by Shandong Zhonglan environmental protection science and technology limited.
In the scheme, the prepared carbon nanotube catalyst is a nickel-based catalyst, the carbon source gas is methane, and the pressure value of a micro-positive pressure one-way valve 1 between the rear end of the carbon nanotube cracking equipment 3 and the adsorption separation system is 30 KPa; the pressure value of the check valve for introducing the hydrogen, namely the opening pressure value of the first check valve 1A is 30 KPa; the power supply of the device is started, namely tail gas separation is carried out, and 99.999 percent of high-purity hydrogen and 95 percent of methane gas can be obtained.
Meanwhile, the carbon source gas can be at least one of propylene or ethylene, and tail gas generated by preparing carbon nanotubes with different specifications can be separated by adjusting the pressure value of the micro-positive pressure one-way valve 1.
The method for separating the tail gas in the process of preparing the carbon nano tube by catalytically cracking the hydrocarbon by using the device can be summarized as the following steps:
step one, collecting tail gas: the method comprises the following steps of utilizing the micro-positive pressure of tail gas generated by a carbon nano tube cracking device 3, opening a micro-positive pressure one-way valve 1, enabling the tail gas to enter a primary tail gas buffer tank 2, and then pressurizing and guiding the tail gas into a secondary tail gas buffer tank 5 by a compressor 4;
step two, tail gas adsorption and separation: tail gas in the first-stage cracking tail gas buffer tank 2 is pressurized and guided into a second-stage tail gas buffer tank 5 by a compressor 4, then enters the corresponding adsorption separation towers through a tail gas inlet valve 6a arranged at the bottom of each adsorption separation tower, and is adsorbed by the adsorbent in each adsorption tower, and hydrogen is not adsorbed, passes through a hydrogen output valve 6b arranged at the top of each adsorption tower and then enters a hydrogen buffer tank 10 through a one-way valve I1A;
step three, separating and storing the carbon source gas: pressure sensors are arranged in the first-level to fourth-level adsorption separation towers 7, 8, 11 and 12, when the pressure reaches a set value of a certain first-level adsorption separation tower, the adsorption of the adsorbent in the tower is nearly saturated, at the moment, the second one-way valve 1B is opened, the corresponding desorption valve 6c is automatically opened, the corresponding tail gas inlet valve 6a is closed, the vacuum pump 9 is started, the carbon source gas is sucked out of the adsorbent and sent into the first-level buffer tank 13, then sent into the second-level buffer tank 15 through the booster pump 14 and finally led into the carbon source gas storage tank.
Finally, the hydrogen entering the hydrogen buffer tank 10 is subsequently guided into a hydrogen storage tank by a corresponding hydrogen compressor for storage, and the hydrogen storage tank is split-packaged and then sold; the carbon source gas storage tank is introduced into a carbon source gas inlet system of the carbon nanotube cracking equipment 3 after pressure is adjusted, and then the carbon nanotube is generated by cracking again.
Example 2
The setting conditions of the device and the valve for separating the tail gas in the preparation process of the carbon nano tube by the multistage partial pressure type adsorption method are the same as those of the embodiment 1.
The difference lies in that: preparing a carbon nano tube catalyst as an iron-based catalyst; the carbon source gas is propylene, and the pressure value of a micro-positive pressure one-way valve 1 between the rear end of the carbon nano tube cracking equipment 3 and the separation system is 20 KPa; the power supply of the device is started, namely, the tail gas is separated, and 99.999 percent of high-purity hydrogen and 95 percent of propylene gas are obtained.
Example 3
The setting conditions of the device and the valve for separating the tail gas in the preparation process of the carbon nano tube by the multistage partial pressure type adsorption method are the same as those of the embodiment 1.
The difference lies in that: preparing a carbon nano tube catalyst which is a cobalt-based catalyst, wherein a carbon source gas is ethylene, and the pressure value of a micro-positive pressure one-way valve 1 between the rear end of a carbon nano tube cracking device 3 and a separation system is 25 KPa; the power supply of the device is started, namely, the tail gas is separated, and 99.999 percent of high-purity hydrogen and 95 percent of ethylene gas are obtained.
Claims (7)
1. The device for separating tail gas in the preparation process of the carbon nano tube by the multistage partial pressure type adsorption method is characterized in that:
comprises a compressor (4) and an adsorption separation system;
the air inlet end of the compressor (4) is communicated with the carbon nano cracking equipment (3) through an exhaust gas pipeline (16), the air outlet end of the compressor is communicated with the air inlet end of the adsorption separation system, and a carbon source gas adsorbent is arranged in the adsorption separation system;
the gas outlet end of the adsorption separation system comprises two paths, wherein one path is communicated with the hydrogen buffer tank (10) through a hydrogen recovery pipeline (18), and the other path is communicated with the carbon source gas storage tank through a carbon source gas recovery pipeline (19);
a micro-positive pressure one-way valve (1) is arranged at one end of the waste gas pipeline (16) close to the carbon nano cracking equipment (3);
and a vacuum pump (9) is arranged at one end of the carbon source gas recovery pipeline (19) close to the adsorption separation system.
2. The apparatus for separating the tail gas in the carbon nanotube preparing process according to the multistage partial pressure type adsorption method of claim 1, wherein: one end of the hydrogen recovery pipeline (18) close to the adsorption and separation system is provided with a one-way valve I (1A), and one end of the carbon source gas recovery pipeline (19) close to the adsorption and separation system is provided with a one-way valve II (1B).
3. The apparatus for separating the tail gas in the carbon nanotube preparing process according to the multistage partial pressure type adsorption method of claim 2, wherein:
the adsorption separation system comprises one-four adsorption separation towers (7, 8, 11 and 12) connected in parallel;
the compressor (4) is respectively communicated with tail gas inlet ends at the bottoms of the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12), and four pipelines communicated with the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12) and the compressor (4) are respectively provided with a tail gas inlet valve (6 a);
the vacuum pump (9) is respectively communicated with carbon source gas separation outlets at the bottoms of the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12), and four pipelines communicated with the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12) and the vacuum pump (9) are respectively provided with a desorption valve (6 c);
the hydrogen buffer tank (10) is respectively communicated with four hydrogen separation outlets at the top of the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12), and four pipelines respectively communicated with the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12) and the hydrogen buffer tank (10) are respectively provided with a hydrogen output valve (6 b).
4. The apparatus for separating the tail gas in the carbon nanotube preparing process according to the multi-stage partial pressure adsorption method of claim 3, wherein: and tail gas inlet valves (6a) of the first-to-fourth-stage adsorption separation towers (7, 8, 11 and 12) are respectively in interlocking connection with corresponding desorption valves (6 c).
5. The apparatus for separating the tail gas in the carbon nanotube preparing process according to the multistage partial pressure type adsorption method of claim 4, wherein: the tail gas inlet valve (6a), the hydrogen output valve (6b) and the desorption valve (6c) are respectively provided with a pressure sensor, wherein the sensing end of the pressure sensor of the desorption valve (6c) is arranged inside the corresponding adsorption separation tower.
6. The apparatus for separating the tail gas in the carbon nanotube preparing process according to the multistage partial pressure type adsorption method of claim 5, wherein: the waste gas pipeline (16) on, still be equipped with one-level tail gas buffer tank (2) between pressure-fired check valve (1) and compressor (4), still be equipped with second grade tail gas buffer tank (5) between compressor (4) and the adsorption separation system.
7. The apparatus for separating the tail gas in the carbon nanotube preparing process according to the multistage partial pressure type adsorption method of claim 6, wherein: on carbon source gas recovery pipeline (19), in the rear end of vacuum pump (9), still be equipped with one-level buffer tank (13), booster pump (14), second grade buffer tank (15) along the air current direction in proper order, second grade buffer tank (15) and carbon source gas holding vessel intercommunication.
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| CN114225628A (en) * | 2021-12-20 | 2022-03-25 | 成都珈丰新能源科技有限公司 | Method and device for separating tail gas in process of preparing carbon nano tube by catalytically cracking hydrocarbon by multistage partial pressure type continuous adsorption method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114225628A (en) * | 2021-12-20 | 2022-03-25 | 成都珈丰新能源科技有限公司 | Method and device for separating tail gas in process of preparing carbon nano tube by catalytically cracking hydrocarbon by multistage partial pressure type continuous adsorption method |
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