CN117623225A - Novel hydrogen purification system and hydrogen purification process method - Google Patents
Novel hydrogen purification system and hydrogen purification process method Download PDFInfo
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- CN117623225A CN117623225A CN202210949048.1A CN202210949048A CN117623225A CN 117623225 A CN117623225 A CN 117623225A CN 202210949048 A CN202210949048 A CN 202210949048A CN 117623225 A CN117623225 A CN 117623225A
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 244
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 244
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 173
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000000746 purification Methods 0.000 title claims abstract description 45
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- 238000001035 drying Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
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- 238000001179 sorption measurement Methods 0.000 claims description 19
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- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 12
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- 230000003197 catalytic effect Effects 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The present disclosure provides a novel hydrogen purification system and process, the novel hydrogen purification system comprises a raw material gas deoxidization process channel and a regeneration gas drying process channel; the raw material hydrogen pre-heater, the deoxidizer and the hydrogen pre-cooler are sequentially communicated with each other in the raw material gas deoxidizing process channel; the regenerated gas drying process channels are distributed with a regenerated gas heater, a dryer group, a hydrogen cooler and a separator group which are sequentially communicated; the dryer group comprises a first dryer, a second dryer and a third dryer; the separator group comprises a first hydrogen separator, a second hydrogen separator and a third hydrogen separator; the first dryer, the second dryer and the third dryer are respectively communicated with the regenerated gas heater and the hydrogen cooler through two ends of each dryer; the hydrogen precooler is respectively communicated with the first hydrogen separator, the second hydrogen separator and the third hydrogen separator; the embodiment of the disclosure reduces the equipment quantity and equipment investment, improves the equipment utilization efficiency, and reduces the consumption of chilled water and electric energy.
Description
Technical Field
The invention belongs to the technical field of new green and environment-friendly hydrogen electrolysis and hydrogen for fuel cells, and particularly relates to a novel hydrogen purification system and a hydrogen purification process method.
Background
At present, hydrogen energy utilization is regarded as a sustainable energy utilization path which is parallel to clean low-carbon utilization and large-scale renewable energy utilization of fossil fuel, the role value of hydrogen energy in the energy conversion process is increasingly prominent, and the interconnection interaction of fossil energy, new energy and a hydrogen electricity secondary energy network becomes a long-term application scene. The international commission on hydrogen energy (The Hydrogen Council) deems: the global large-scale utilization of hydrogen energy starts from 2030, the 2040-year hydrogen energy is about 18% of the global terminal energy consumption, and the 2050-year hydrogen energy utilization can contribute to 20% of the global carbon dioxide emission reduction.
The current industrialized hydrogen production method has a plurality of methods including natural gas steam reforming hydrogen production, methanol reforming hydrogen production, water gas hydrogen production and water electrolysis hydrogen production. The raw material water for the water electrolysis hydrogen production is inexhaustible, the reaction product after energy use is water, and meanwhile, the electric energy of the electrolysis water can be used as an environment-friendly energy source through wind energy, solar energy and nuclear energy, so that the water electrolysis hydrogen production has good social benefit and economic benefit.
As is known, the hydrogen prepared by the general hydrogen production process cannot meet the subsequent production requirements due to low purity and excessive moisture content. Therefore, in order to remove impurities in hydrogen gas, it is generally necessary to introduce a purification device. The purification unit generally comprises a deoxygenation column for removing trace amounts of oxygen contained in the hydrogen gas and a drying column for removing moisture contained in the hydrogen gas and a corresponding cooler. In order to make the purification device continuously and stably run, the prior art also adopts a pressureless regeneration method, namely, two drying towers have different working pressures, one drying tower is used for drying gas under the system pressure, and the other drying tower is used for regenerating under the normal pressure. Two-tower processes and three-tower processes can be classified according to the number of drying towers.
At present, the deoxidizer and the dryer in the purification process are integrated by electric heating and adsorbent or desiccant, which not only causes the reduction of the utilization rate of electric heaters of three dryers and the waste of investment, but also causes the difficulty in processing the dryers and the heaters, uneven bed layer distribution and poor purification effect. In addition, the current three-tower process is provided with three hydrogen coolers, but only an electric heater and one cooler work in each stage, which causes the reduction of the utilization efficiency of equipment, the increase of investment and the large consumption of chilled water and electric energy.
Disclosure of Invention
In view of the foregoing problems in the prior art, the present invention provides a novel hydrogen purification system that requires only a small amount of equipment, is efficient and energy-saving, and is safe and reliable.
In order to achieve the above purpose, the technical scheme adopted by the embodiment of the invention is as follows:
in one aspect, a novel hydrogen purification system is provided, comprising: a raw material gas deoxidizing process channel and a regenerated gas drying process channel; the raw material gas deoxidization process channel and the regenerated gas drying process channel are communicated at one end respectively; the raw material gas deoxidization process channels are distributed with sequential communication: a raw material hydrogen pre-heater, a deoxidizer and a hydrogen pre-cooler; the regenerated gas drying process channels are distributed with sequential communication: a regeneration gas heater, a dryer group, a hydrogen cooler and a separator group; wherein, the desicator group includes three desicators, respectively: a first dryer, a second dryer, and a third dryer; the separator group comprises three hydrogen separators, which are respectively: the first hydrogen separator, the second hydrogen separator and the third hydrogen separator; the first dryer, the second dryer and the third dryer are respectively communicated with the regenerated gas heater and the hydrogen cooler through two ends of each dryer; the hydrogen precooler is respectively communicated with the first hydrogen separator, the second hydrogen separator and the third hydrogen separator.
In some embodiments of the invention, the dryer comprises, distributed sequentially from top to bottom: an upper distributor, an upper packing zone, a catalytic zone, a lower packing zone and a lower distributor; the catalytic zone is used for producing water by hydrogen and oxygen under the action of a catalyst; the upper filling area and the lower filling area are used for filling the filtering structure; the upper distributor is provided with an upper opening; the lower distributor is provided with a lower opening.
In some embodiments of the invention, the filter structure comprises ceramic balls, wire mesh and grids of a predetermined particle size.
In some embodiments of the invention, the deoxygenator comprises a top-down sequence: an upper sparger for deoxygenation, an upper fill zone for fill filtration, a catalytic zone for production water, a lower fill zone for fill filtration, and a lower sparger for deoxygenation; the upper distributor for deoxidization is provided with an upper opening; the lower sparger for deoxygenation is provided with a lower opening.
In some embodiments of the invention, the hydrogen separator is configured as a gravity separator or a wire mesh separator.
In some embodiments of the invention, the hydrogen separator includes a gas-liquid inlet located on the side of the furnace shell, a hydrogen outlet at the top of the furnace shell, and a condensate outlet at the bottom of the furnace shell.
In some embodiments of the invention, the hydrogen pre-cooler, the hydrogen cooler is configured as a shell-and-tube heat exchanger.
In some embodiments of the invention, the feed hydrogen preheater is provided as a heat exchanger or an electric heater.
In some embodiments of the invention, the regeneration gas heater employs any one of the following heat sources: high temperature flue gas, steam, electricity.
In another aspect, the present invention further provides a process for purifying hydrogen, which is used in the novel hydrogen purification system, according to the states corresponding to the first dryer, the second dryer and the third dryer, the following method for purifying hydrogen is adopted:
in the case of state one, the process comprises: the first dryer is in an adsorption state, the second dryer is in a drying state, and the third dryer is in a regeneration state; judging a regeneration result of the third dryer after the heating time of the third dryer reaches a preset time, and when the judgment result is yes, carrying out cold blowing on the third dryer to end the current state;
in the case of state two, the process comprises: the first dryer is in a drying state, the second dryer is in a regeneration state, and the third dryer is in an adsorption state; judging a regeneration result of the second dryer after the heating time of the second dryer reaches a preset time, and when the judgment result is yes, carrying out cold blowing on the second dryer to end the current state;
in case of state three, the process comprises: the first dryer is in a regeneration state, the second dryer is in an adsorption state, and the third dryer is in a drying state; and judging a regeneration result of the first dryer after the heating time of the first dryer reaches the preset time, and when the judgment result is yes, carrying out cold blowing on the first dryer to end the current state.
Compared with the prior art, the invention has the beneficial effects that:
the crude hydrogen generated by electrolysis after wind power and photovoltaic power generation can be purified to purified hydrogen meeting the standard of hydrogen products for fuel cells, thereby achieving the purpose of providing green, low-carbon, environment-friendly and low-cost fuel for emerging industries such as fuel cell automobiles and the like.
By arranging a regenerated gas heater and a hydrogen cooler to replace the three electric heaters and the hydrogen cooler of the original three-tower process, the number of equipment is reduced, the equipment investment is increased, the equipment utilization efficiency is improved, and the consumption of resources such as chilled water, electric energy and the like is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure, not to limit the present disclosure.
FIG. 1 is a schematic diagram of a novel hydrogen purification system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dryer of a novel hydrogen purification system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a process for hydrogen purification according to an embodiment of the present invention.
Description of the reference numerals
1-upper distributor; 2-upper fill region; 3-adsorption zone; 4-an underfill region;
5-lower distributor;
a-an upper opening;
b-lower opening
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In order to purify crude hydrogen generated by electrolysis after power generation of wind power and photovoltaic power generation into purified hydrogen meeting the standard of hydrogen products for fuel cells, the purpose of providing green, low-carbon, environment-friendly and low-cost fuel for emerging industries such as fuel cell automobiles and the like is achieved. The invention provides the following solutions:
in one aspect, a novel hydrogen purification system is provided, see fig. 1, comprising: a raw material gas deoxidizing process channel and a regenerated gas drying process channel; the raw material gas deoxidization process channel and the regenerated gas drying process channel are communicated at one end respectively; the raw material gas deoxidization process channels are distributed with sequential communication: a raw material hydrogen pre-heater, a deoxidizer and a hydrogen pre-cooler; the regenerated gas drying process channels are distributed with sequential communication: a regeneration gas heater, a dryer group, a hydrogen cooler and a separator group; wherein, the desicator group includes three desicators, respectively: a first dryer, a second dryer, and a third dryer; the separator group comprises three hydrogen separators which are used for separating condensed water and hydrogen, and in the embodiment, the three hydrogen separators are respectively: the first hydrogen separator, the second hydrogen separator and the third hydrogen separator; the first dryer, the second dryer and the third dryer are respectively communicated with the regenerated gas heater and the hydrogen cooler through two ends of each dryer; the hydrogen precooler is respectively communicated with the first hydrogen separator, the second hydrogen separator and the third hydrogen separator.
Further, the hydrogen separator is configured as a gravity separator or a wire mesh separator.
Further, the hydrogen separator comprises a gas-liquid inlet positioned on the side surface of the furnace shell, a hydrogen outlet positioned on the top of the furnace shell and a condensate outlet positioned on the bottom of the furnace shell.
In this embodiment, the hydrogen pre-cooler is communicated with the hydrogen pre-cooler through a gas-liquid inlet of the hydrogen separator. In actual operation: typically 10000Nm3/h of raw material hydrogen (electrolyzed crude hydrogen) is first heated to 100 ℃ by the raw material hydrogen heater, then enters the deoxidizer to perform deoxidization reaction, then enters the hydrogen precooler tube side, exchanges heat with 60t/h of chilled water in the hydrogen precooler shell side, and is cooled to 15 ℃, and then enters one of the first hydrogen separator, the second hydrogen separator and the third hydrogen separator according to the specific conditions of the respective corresponding states of the first dryer, the second dryer and the third dryer, and the specific entering mode will be described later in the description of the process. In addition, the hydrogen outlet of the hydrogen separator may have different functions at different stages, and may be used as either the outlet or the inlet of hydrogen, and the hydrogen outlet is named here for convenience of description. The function of the hydrogen outlet in the whole hydrogen purification will also be described later in connection with the process.
Through the novel hydrogen purification system of the embodiment, the three-tower process commonly used in the prior art can be replaced, the equipment utilization efficiency is improved, the equipment investment is reduced, and a large amount of consumption of chilled water and electric energy is avoided.
Further, the hydrogen pre-cooler and the hydrogen cooler are configured as shell-and-tube heat exchangers. For example, in this embodiment, the shell side of the hydrogen pre-cooler is filled with chilled water, and the tube side is filled with deoxygenated high-temperature hydrogen. And the high-temperature hydrogen after the reaction enters a tube side of a hydrogen pre-cooler and is subjected to heat exchange cooling with chilled water in a shell side. The hydrogen in the tube side is high-temperature hydrogen, and water vapor in the hydrogen is condensed into condensed water while cooling down, and enters the first hydrogen separator, the second hydrogen separator or the third hydrogen separator along with the hydrogen according to different current process stages (such as time sequences). In this embodiment, the hydrogen gas is separated from the condensed water, and the separated condensed water is discharged from the bottom of the hydrogen cooler.
Further, the raw material hydrogen preheater is arranged as a heat exchanger or an electric heater and mainly used for preheating crude hydrogen to reach the reaction temperature of catalytic deoxidation.
Further, the regeneration gas heater adopts any one of the following heat sources: high temperature flue gas, steam, electricity. The regenerated gas heater can adopt different heat sources such as high-temperature flue gas, steam, electricity and the like according to scale and site conditions, and has wider adaptability.
In the embodiment, only one regenerated gas heater and one hydrogen cooler are arranged, so that the number of equipment is reduced, the equipment investment is correspondingly reduced, the equipment utilization efficiency is further improved, and the consumption of resources such as chilled water, electric energy and the like is reduced.
In addition, by separating the heating of the deoxidizer from the heating of the dryer and separating the deoxidizing part from the drying part, the equipment design and processing difficulty of the deoxidizer and the dryer are reduced, the uniformity of equipment bed layer distribution is improved, and the deoxidizing and drying effects are improved.
In one embodiment, referring to fig. 2, the dryer includes, distributed sequentially from top to bottom: an upper distributor 1, an upper filling zone 2, an adsorption zone 3, a lower filling zone 4 and a lower distributor 5; wherein the adsorption zone 3 is used for producing water by hydrogen and oxygen under the action of a catalyst; the upper filling area 2 and the lower filling area 4 are used for filling a filtering structure, and the filtering structure comprises ceramic balls with preset particle sizes, a silk screen and a grid; the upper distributor 1 is provided with an upper opening A; the lower distributor 5 is provided with a lower opening B. In this embodiment, the adsorption zone 3 or adsorption zone is the primary reaction zone for drying and dewatering. The upper filling area 2 and the lower filling area 4 are filled with substances such as ceramic balls with certain particle size, and the substances mainly prevent the catalyst from being blown out of the dryer due to the too fast gas speed of the purified hydrogen. The upper distributor 1 and the lower distributor 2 mainly uniformly distribute gas through drying, so that the drying effect is prevented from being reduced due to short circuit of the gas and the like.
In one embodiment, the deoxidizer (not shown) comprises a top-to-bottom distribution: an upper sparger for deoxygenation, an upper fill zone for fill filtration, a catalytic zone for production water, a lower fill zone for fill filtration, and a lower sparger for deoxygenation; the upper distributor for deoxidization is provided with an upper opening; the lower sparger for deoxygenation is provided with a lower opening. The oxygen in the raw material hydrogen (electrolyzed crude hydrogen) can be removed by the deoxidizer. The raw material hydrogen is heated to about 100 ℃ under the heating of a central electric heater of a raw material hydrogen heater, and after entering a deoxidizer, a small amount of oxygen reacts with hydrogen to generate water under the action of a catalyst in the deoxidizer. This exerts a deoxidizing function. In addition, in this example, the catalytic zone for producing water is the primary reaction zone for catalytic deoxygenation. The upper filling area for filling and filtering, the lower filling area for filling and filtering are filled with substances such as ceramic balls with certain particle size, and the like, so that the catalyst is mainly prevented from being blown out of the deoxidizer due to the excessively fast gas speed of deoxidized hydrogen. The upper distributor for deoxidization and the lower distributor for deoxidization mainly ensure that gas is uniformly distributed in the deoxidization process, so that the deoxidization effect is prevented from being reduced due to short circuit of the gas and the like.
In this embodiment, it should be added that the dryer and the deoxidizer are substantially identical in comparison to each other in terms of the overall structure. Except that the two are respectively positioned at different positions in the hydrogen purification process, and the corresponding functions are different. For example, on a feed gas deoxygenation process channel, feed hydrogen is one-way flowing through the deoxygenator; in contrast, on the regeneration gas drying process channel, hydrogen needs to enter or exit from the upper opening a or the lower opening B of the dryer at different stages during the continuous purification and regeneration, and the flow direction of hydrogen in the dryer can be understood as bi-directional. The continuous purification and regeneration process for hydrogen will be described in connection with the final process.
In another aspect, referring to fig. 3, the present invention further provides a process for purifying hydrogen, which is used in the novel hydrogen purifying system, according to the states corresponding to the first dryer, the second dryer and the third dryer, the following method for purifying hydrogen is adopted:
in the case of state one, the process comprises: the first dryer is in an adsorption state, the second dryer is in a drying state, and the third dryer is in a regeneration state; judging a regeneration result of the third dryer after the heating time of the third dryer reaches a preset time, and when the judgment result is yes, carrying out cold blowing on the third dryer to end the current state;
in the case of state two, the process comprises: the first dryer is in a drying state, the second dryer is in a regeneration state, and the third dryer is in an adsorption state; judging a regeneration result of the second dryer after the heating time of the second dryer reaches a preset time, and when the judgment result is yes, carrying out cold blowing on the second dryer to end the current state;
in case of state three, the process comprises: the first dryer is in a regeneration state, the second dryer is in an adsorption state, and the third dryer is in a drying state; and judging a regeneration result of the first dryer after the heating time of the first dryer reaches the preset time, and when the judgment result is yes, carrying out cold blowing on the first dryer to end the current state.
From the description of the above process, it can be found that each drying tower is subjected to three stages of adsorption, regeneration and drying, respectively, so as to realize continuous purification and regeneration of hydrogen, and at the same time, part of heat of regenerated hydrogen is recovered by a hydrogen cooler, and the regenerated hydrogen accounts for about 10% -20% of purified hydrogen.
In order to further understand the structural features of the novel hydrogen purification system and the process methods applied to the novel hydrogen purification system, a brief description will now be made of the complete process of hydrogen purification.
After deoxidizing raw material hydrogen, forming high-temperature hydrogen, cooling by a hydrogen precooler, and starting a hydrogen purification process by adopting a corresponding hydrogen purification method based on the respective states of the first dryer, the second dryer and the third dryer, and entering a corresponding one of the first hydrogen separator, the second hydrogen separator and the third hydrogen separator.
Because each dryer of the first dryer, the second dryer and the third dryer is respectively subjected to one of three stages of adsorption, regeneration and drying in the same process, the continuous purification and regeneration of hydrogen are finally realized. The specific process comprises the following steps:
when the first dryer is in an adsorption state, the second dryer is in a drying state, and the third dryer is in a regeneration state, hydrogen enters the first hydrogen separator.
Referring to fig. 1, at this time, the valves (K1A, K10A, K9A, K8C, K6C, K5C, K4C, K3C, K2B, K10B, K9B, K7B) are opened; after the hydrogen is separated in the first hydrogen separator, the moisture contained in the hydrogen is condensed and flows out from the lower part of the first hydrogen separator in the form of condensate; the separated hydrogen flows out from a hydrogen outlet above the first hydrogen separator, enters the first dryer through a lower opening B of the first dryer, flows out from an upper opening A of the first dryer after being absorbed in the first dryer, continuously flows into a regeneration gas heater, and enters the third dryer from an upper opening A of the third dryer after being heated by the regeneration gas heater, and is subjected to regeneration treatment; and then, after flowing out of the opening B below the third dryer and sequentially passing through the hydrogen cooler, the third hydrogen separator and the second hydrogen separator, wherein hydrogen flows in from a hydrogen outlet of the third hydrogen separator, enters the second dryer for drying treatment, judges the regeneration result of the third dryer after the heating time of the third dryer reaches a preset time, starts cold blowing the third dryer when the judgment result is yes, and finishes the current state, and at the moment, valves (K1A, K10A, K9A, K8A, K8C, K9C, K4C, K3C, K2C, K2B, K10B, K9B and K7B) are opened, and finally, the product hydrogen flows out of the valve K7B and enters a downstream process.
It should be noted that, in the above process, the process includes a plurality of valves for controlling and adjusting in addition to the dryer, the separator and the cooler, and the type structure of the valves is not described herein, and may be selected according to the process requirement; in addition, in the description of the hydrogen purification process of the present application, the current state of the valve is not mentioned or defined, and is understood to be in the closed state, as follows.
When the first dryer is in a drying state, the second dryer is in a regeneration state, and the third dryer is in an adsorption state, hydrogen enters the third hydrogen separator.
Referring to fig. 1, at this time, the valves (K1C, K10C, K9C, K8B, K6B, K5B, K4B, K3B, K2A, K10A, K9A, K7A) are opened; after the hydrogen is separated in the third hydrogen separator, the moisture contained in the hydrogen is condensed and flows out from the lower part of the third hydrogen separator in the form of condensate; the separated hydrogen flows out from a hydrogen outlet above the third hydrogen separator, enters the third dryer through a lower opening B of the third dryer, flows out from an upper opening A of the third dryer after being absorbed in the third dryer, continuously flows into a regeneration gas heater, and enters the second dryer from an upper opening A of the second dryer after being heated by the regeneration gas heater, and is subjected to regeneration treatment; and then, after flowing out of the opening B below the second dryer and sequentially passing through the hydrogen cooler, the second hydrogen separator and the first hydrogen separator, wherein hydrogen flows in from a hydrogen outlet of the third hydrogen separator, enters the first dryer for drying treatment, judges the regeneration result of the second dryer after the heating time of the second dryer reaches a preset time, starts cold blowing the second dryer when the judgment result is yes, and finishes the current state, and at the moment, valves (K1C, K10C, K9C, K8C, K8B, K9B, K4B, K3B, K2B, K2A, K10A, K9A and K7A) are opened, and finally, the product hydrogen flows out of the valve K7A and enters a downstream process.
When the first dryer is in a regeneration state, the second dryer is in an adsorption state, and the third dryer is in a drying state, hydrogen enters the third hydrogen separator.
Referring to fig. 1, at this time, the valves (K1B, K10B, K9B, K8A, K6A, K5A, K4A, K3A, K2C, K10C, K9C, K7C) are opened; after the hydrogen is separated in the second hydrogen separator, the moisture contained in the hydrogen is condensed and flows out from the lower part of the second hydrogen separator in the form of condensate; the separated hydrogen flows out from a hydrogen outlet above the second hydrogen separator, enters the second dryer through a lower opening B of the second dryer, flows out from an upper opening A of the second dryer after being absorbed in the second dryer, continuously flows into a regeneration gas heater, and enters the first dryer from an upper opening A of the first dryer after being heated by the regeneration gas heater, and is subjected to regeneration treatment; and then, after flowing out of the opening B below the first dryer and sequentially passing through the hydrogen cooler, the first hydrogen separator and the third hydrogen separator, wherein hydrogen flows in from a hydrogen outlet of the first hydrogen separator, enters the third dryer for drying treatment, judges the regeneration result of the first dryer after the heating time of the first dryer reaches a preset time, starts cold blowing the first dryer when the judgment result is yes, and finishes the current state, and at the moment, valves (K1B, K10B, K9B, K8B, K8A, K9A, K4A, K3A, K2A, K2C, K10C, K9C and K7C) are opened, and finally, product hydrogen flows out of the valve K7C and enters a downstream process.
During the hydrogen flowing through the hydrogen cooler, part of the heat of the regenerated hydrogen is recovered through the hydrogen cooler.
In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed description of known functions and known components.
Furthermore, although illustrative embodiments are described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of schemes across various embodiments), adaptations or alterations based on the present disclosure. Elements in the claims will be construed broadly based on the language used in the claims and not limited to examples described in the specification or during the lifetime of the application. Furthermore, the steps of the disclosed methods may be modified in any manner, including by reordering steps or inserting or deleting steps. It is intended, therefore, that the description be regarded as examples only, with a true scope being indicated by the following claims and their full range of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other embodiments may be used by those of ordinary skill in the art after reading the above description. Moreover, in the foregoing detailed description, various features may be grouped together to simplify the present disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Thus, the following claims are incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with one another in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
Claims (10)
1. A novel hydrogen purification system, comprising: a raw material gas deoxidizing process channel and a regenerated gas drying process channel; the raw material gas deoxidization process channel and the regenerated gas drying process channel are communicated at one end respectively;
the raw material gas deoxidization process channels are distributed with sequential communication: a raw material hydrogen pre-heater, a deoxidizer and a hydrogen pre-cooler;
the regenerated gas drying process channels are distributed with sequential communication: a regeneration gas heater, a dryer group, a hydrogen cooler and a separator group; wherein, the desicator group includes three desicators, respectively: a first dryer, a second dryer, and a third dryer; the separator group comprises three hydrogen separators, which are respectively: the first hydrogen separator, the second hydrogen separator and the third hydrogen separator;
the first dryer, the second dryer and the third dryer are respectively communicated with the regenerated gas heater and the hydrogen cooler through two ends of each dryer;
the hydrogen precooler is respectively communicated with the first hydrogen separator, the second hydrogen separator and the third hydrogen separator.
2. The novel hydrogen purification system of claim 1, wherein the dryer comprises, in order from top to bottom: an upper distributor, an upper packing zone, a catalytic zone, a lower packing zone and a lower distributor; wherein,
the catalytic zone is used for producing water by hydrogen and oxygen under the action of a catalyst;
the upper filling area and the lower filling area are used for filling the filtering structure;
the upper distributor is provided with an upper opening;
the lower distributor is provided with a lower opening.
3. The novel hydrogen purification system of claim 2, wherein the filter structure comprises ceramic balls, wire mesh, and grids of a predetermined particle size.
4. The novel hydrogen purification system of claim 2, wherein the deoxygenator comprises, distributed sequentially from top to bottom: an upper sparger for deoxygenation, an upper fill zone for fill filtration, a catalytic zone for production water, a lower fill zone for fill filtration, and a lower sparger for deoxygenation;
the upper distributor for deoxidization is provided with an upper opening;
the lower sparger for deoxygenation is provided with a lower opening.
5. The novel hydrogen purification system of claim 1, wherein the hydrogen separator is configured as a gravity separator or a wire mesh separator.
6. The novel hydrogen purification system of claim 5, wherein the hydrogen separator comprises a gas-liquid inlet located on the side of the furnace shell, a hydrogen outlet at the top of the furnace shell, and a condensate outlet at the bottom of the furnace shell.
7. The novel hydrogen purification system of claim 1, wherein the hydrogen pre-cooler, the hydrogen cooler is configured as a shell-and-tube heat exchanger.
8. The novel hydrogen purification system of claim 1, wherein the feed hydrogen preheater is configured as a heat exchanger or an electric heater.
9. The novel hydrogen purification system of claim 1, wherein the regeneration gas heater employs any one of the following heat sources: high temperature flue gas, steam, electricity.
10. A process for hydrogen purification for a novel hydrogen purification system according to any one of claims 1 to 9, characterized in that, depending on the respective states of the first dryer, the second dryer and the third dryer, the following hydrogen purification method is adopted:
in the case of state one, the process comprises: the first dryer is in an adsorption state, the second dryer is in a drying state, and the third dryer is in a regeneration state; judging a regeneration result of the third dryer after the heating time of the third dryer reaches a preset time, and when the judgment result is yes, carrying out cold blowing on the third dryer to end the current state;
in the case of state two, the process comprises: the first dryer is in a drying state, the second dryer is in a regeneration state, and the third dryer is in an adsorption state; judging a regeneration result of the second dryer after the heating time of the second dryer reaches a preset time, and when the judgment result is yes, carrying out cold blowing on the second dryer to end the current state;
in case of state three, the process comprises: the first dryer is in a regeneration state, the second dryer is in an adsorption state, and the third dryer is in a drying state; and judging a regeneration result of the first dryer after the heating time of the first dryer reaches the preset time, and when the judgment result is yes, carrying out cold blowing on the first dryer to end the current state.
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