CN115924850A - Integrated oxygen generation device and method based on temperature swing adsorption - Google Patents
Integrated oxygen generation device and method based on temperature swing adsorption Download PDFInfo
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- CN115924850A CN115924850A CN202211522202.3A CN202211522202A CN115924850A CN 115924850 A CN115924850 A CN 115924850A CN 202211522202 A CN202211522202 A CN 202211522202A CN 115924850 A CN115924850 A CN 115924850A
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Abstract
The invention relates to an integral oxygen generating device and an oxygen generating method based on temperature swing adsorption; belongs to the technical field of oxygen generation, and comprises the following steps: (1) adsorption; (2) hot air desorption; (3) thermal oxygen desorption; (4) cooling oxygen; the process parameters are as follows: the temperature of hot air for desorption in the hot air desorption process is 100-150 ℃; the temperature of the hot oxygen for further cleaning and desorption in the hot oxygen desorption process is 100-150 ℃; the hot air used in the hot air desorption step realizes closed cycle between the air heater and the adsorption tower through the circulating fan. The integral oxygen generation device and the oxygen generation method based on temperature swing adsorption adopt the integral oxygen generation adsorbent with lower bed layer pressure resistance, and the heat source can be from waste heat recovery, so that the oxygen generation energy consumption and the operation noise can be obviously reduced.
Description
Technical Field
The invention relates to an integral oxygen generating device and an oxygen generating method based on temperature swing adsorption; belongs to the technical field of oxygen generation.
Background
Oxygen is one of the essential gases for the survival and production of modern human beings. Industrial oxygen is generally applied to the fields of metallurgy, machining and the like.
Currently, the main production methods of industrial oxygen include a cryogenic liquid air separation method, a membrane separation method, a Pressure Swing Adsorption (PSA) method, and the like. The low-temperature liquid air separation method mainly utilizes the difference of the boiling points of oxygen and nitrogen in the air to separate and purify the oxygen to obtain high-purity oxygen; the principle of the membrane separation method is that the speed difference of nitrogen and oxygen molecules passing through the membrane is utilized to prepare oxygen; the pressure swing adsorption method is to realize the separation of nitrogen and oxygen by utilizing the physical adsorption of the oxygen-making molecular sieve.
The low-temperature liquid air separation method can prepare oxygen with the purity of more than 99 percent, but the method has high investment cost, large energy consumption and large occupied area, so the use scene is limited, and the method is not beneficial to large-scale popularization. The membrane separation method has low energy consumption and simple process, but the purity of the prepared oxygen is lower than that of the liquid air separation method and is only about 40 percent. The pressure swing adsorption method can obtain oxygen with purity of more than 90%, but when in use, the noise of the machine is large, the pressure resistance of the densely filled bed layer is large, and the energy consumption is high.
With the development of industry, people have more and more strict requirements on energy consumption of each link in industrial production, especially in the fields of oxygen utilization in industry such as metallurgy, machining, engineering construction and the like. The three common industrial oxygen generation methods are limited by the principle of the method, so that the energy consumption is overhigh.
Therefore, it is a technical problem to be solved urgently in the technical field to provide an integrated oxygen generating device and an oxygen generating method based on temperature swing adsorption, which have the advantages of low oxygen generating energy consumption, low operation noise, more flexible application and lower cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an integrated oxygen generating device based on temperature swing adsorption, which has the advantages of reduced oxygen generation energy consumption, reduced operation noise, more flexible application and lower cost.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides an integral oxygenerator based on temperature swing adsorption which characterized in that: the system comprises a first adsorption tower, a second adsorption tower, a third adsorption tower, a fourth adsorption tower, a first hot air desorption air inlet valve, a second hot air desorption air inlet valve, a third hot air desorption air inlet valve, a fourth hot air desorption air inlet valve, a first hot oxygen desorption air inlet valve, a second hot oxygen desorption air inlet valve, a third hot oxygen desorption air inlet valve, a fourth hot oxygen desorption air inlet valve, a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve, a fourth product gas exhaust valve, a first raw material gas inlet valve, a second raw material gas inlet valve, a third raw material gas inlet valve, a fourth raw material gas inlet valve, a first oxygen desorption air exhaust valve, a second oxygen cooling exhaust valve, a fourth oxygen cooling exhaust valve, a first hot air desorption air exhaust valve, a second hot air desorption air exhaust valve, a third hot air desorption air exhaust valve, a fourth hot oxygen desorption air desorption exhaust valve, a first hot oxygen exhaust valve, a second hot oxygen desorption air heater, a fourth hot oxygen desorption air heater, a circulating oxygen flow rate fan and a circulating oxygen flow rate fan; the blower is respectively connected with a first raw material gas inlet valve arranged at the lower part of the first adsorption tower, a second raw material gas inlet valve arranged at the lower part of the second adsorption tower, a third raw material gas inlet valve arranged at the lower part of the third adsorption tower and a fourth raw material gas inlet valve arranged at the lower part of the fourth adsorption tower through a raw material gas path; one end of the air heater is connected with the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower respectively through a hot air pipeline, a first hot air desorption air inlet valve, a second hot air desorption air inlet valve, a third hot air desorption air inlet valve and a fourth hot air desorption air inlet valve; the other end of the air heater is connected with one end of the circulating fan; the other end of the circulating fan is respectively connected with the bottoms of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower through a hot air pipeline and a first hot air desorption gas exhaust valve, a second hot air desorption gas exhaust valve, a third hot air desorption gas exhaust valve and a fourth hot air desorption gas exhaust valve; one end of the oxygen heater is respectively connected with the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower through a hot oxygen pipeline and a first hot oxygen desorption air inlet valve, a second hot oxygen desorption air inlet valve, a third hot oxygen desorption air inlet valve and a fourth hot oxygen desorption air inlet valve; the other end of the oxygen heater is respectively connected with the bottoms of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower through a hot oxygen pipeline and a first oxygen cooling exhaust valve, a second oxygen cooling exhaust valve, a third oxygen cooling exhaust valve and a fourth oxygen cooling exhaust valve; a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve and a fourth product gas exhaust valve at the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower are connected with one end of the product gas exhaust valve through a cooling oxygen pipeline, and the other end of the product gas exhaust valve is connected with a flow regulating valve; the first adsorption tower, the second adsorption tower, the third adsorption tower and the first thermal oxygen desorption gas exhaust valve, the second thermal oxygen desorption gas exhaust valve, the third thermal oxygen desorption gas exhaust valve and the fourth thermal oxygen desorption gas exhaust valve at the bottom of the fourth adsorption tower are connected with each other through a product gas pipeline and are connected with the product gas pipeline.
Preferably, the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower are filled with honeycomb system oxygen adsorbents which are integrally extruded or loaded by glass fiber substrates.
Preferably, the honeycomb system oxygen adsorbent includes, but is not limited to, FAU and LTA molecular sieves and oxygen adsorbents obtained after modification based on the above molecular sieve ions.
Preferably, the honeycomb body is densely and orderly packed within the column with the upstream and downstream channels aligned.
Preferably, the outer walls of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower, and the outer walls of the raw material gas pipeline, the hot air pipeline and the hot oxygen pipeline are provided with heat preservation pipelines.
The invention also aims to provide an integral oxygen generation method based on temperature swing adsorption, which can adopt plant waste heat regeneration to reduce the oxygen production cost in the oxygen generation process and reduce the noise of equipment.
The above object of the present invention is achieved by the following technical solutions:
an integrated oxygen production method based on temperature swing adsorption comprises the following steps:
(1) Adsorption;
(2) Desorbing by hot air;
(3) Thermal oxygen desorption;
(4) And (5) cooling the oxygen.
Preferably, the process parameters are as follows: the temperature of hot air for desorption in the hot air desorption process is 100-150 ℃; the temperature of the hot oxygen for further cleaning and desorption in the hot oxygen desorption process is 100-150 ℃; and the hot air used in the hot air desorption step passes through a circulating fan to realize closed circulation between the air heater and the adsorption tower.
Preferably, the temperature swing adsorption-based integrated oxygen production method comprises the following specific steps:
air, namely raw material gas, is subjected to necessary pretreatment, is pressurized by a blower, and is respectively sent into four adsorption towers through a first raw material gas inlet valve, a second raw material gas inlet valve, a third raw material gas inlet valve and a fourth raw material gas inlet valve, and most of the oxygen is converged at the top of the adsorption towers after most of the nitrogen and a small part of the oxygen are adsorbed; a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve and a fourth product gas exhaust valve are opened, oxygen-enriched product gas flows into the cooling oxygen pipeline from the top of the tower, the product gas exhaust valves and the flow regulating valves are opened at the moment, and part of the product gas is sent to a user side for use; meanwhile, a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve and a fourth product gas exhaust valve which are in the oxygen cooling process are opened, and normal-temperature oxygen-enriched product gas enters an adsorption tower to cool a high-temperature bed layer; the high-temperature oxygen-enriched product gas after heat exchange is discharged into a hot oxygen pipeline through a first oxygen cooling exhaust valve, a second oxygen cooling exhaust valve, a third oxygen cooling exhaust valve and a fourth oxygen cooling exhaust valve; after the higher-temperature oxygen-enriched gas in the hot oxygen pipeline is heated to a specified temperature by an oxygen heater, the higher-temperature oxygen-enriched gas enters the adsorption tower which is in the hot oxygen desorption process through a first hot oxygen desorption air inlet valve, a second hot oxygen desorption air inlet valve, a third hot oxygen desorption air inlet valve and a fourth hot oxygen desorption air inlet valve at the top of the adsorption tower, and the bed layer is further cleaned and desorbed; after heat exchange is completed, high-temperature oxygen-rich gas is discharged into a product gas pipeline from a first hot oxygen desorption gas exhaust valve, a second hot oxygen desorption gas exhaust valve, a third hot oxygen desorption gas exhaust valve and a fourth hot oxygen desorption gas exhaust valve at the bottom of the adsorption tower and is sent to a user side for use; the hot air is pressurized by the circulating fan, the air heater is heated to a specified temperature, then the hot air enters the adsorption tower to be subjected to air heating desorption through the first hot air desorption air inlet valve, the second hot air desorption air inlet valve, the third hot air desorption air inlet valve and the fourth hot air desorption air inlet valve on the hot air pipeline, the hot air and the bed layer in the adsorption tower are subjected to heat exchange, the temperature of the bed layer is increased, the hot air subjected to heat exchange is discharged into the hot air pipeline again from the first hot air desorption air exhaust valve, the second hot air desorption air exhaust valve, the third hot air desorption air exhaust valve and the fourth hot air desorption air exhaust valve at the bottom of the adsorption tower, and the hot air is pressurized by the circulating fan and heated by the oxygen heater for cyclic use.
Preferably, the work flow of the first adsorption tower is as follows:
(1) Adsorption
After the pressure of a blower is increased, clean air which is filtered, dedusted, dried and dewatered by a filter is sent to a raw material gas pipeline, a first raw material gas inlet valve is controlled to be opened, so that raw material gas enters a first adsorption tower, nitrogen is adsorbed in the first adsorption tower, oxygen is enriched, a first product gas exhaust valve is opened, oxygen-enriched gas enters a cooling oxygen pipeline, a second product gas exhaust valve and a second oxygen cooling exhaust valve of a second adsorption tower are opened, oxygen-enriched product gas enters a cooling bed layer of the second adsorption tower, a product gas exhaust valve is opened, a flow regulating valve controls the product gas flow output, after the first adsorption tower is adsorbed and saturated, a first raw material gas inlet valve, a first product gas exhaust valve, a second product gas exhaust valve and a second oxygen cooling exhaust valve are closed, and the first adsorption tower enters the next working procedure;
(2) Hot air desorption
Hot air flowing out from the bottom of a fourth adsorption tower which executes a previous hot air desorption process enters a hot air pipeline, a fourth hot air desorption air inlet valve and a fourth hot air desorption air exhaust valve of the fourth adsorption tower are closed, a first hot air desorption air inlet valve and a first hot air desorption air exhaust valve of the first adsorption tower are opened, hot air in the hot air pipeline is sent to an air heater after passing through a circulating fan, the temperature is raised to a set value and then enters a heating desorption bed layer of the first adsorption tower through the first hot air desorption air inlet valve of the first adsorption tower, exhausted air flows out from the first hot air desorption air exhaust valve and then is sent to the air heater again for heating circulation by the circulating fan until the hot air desorption of the bed layer of the first adsorption tower is finished, and then the first hot air desorption air inlet valve and the first hot air desorption air exhaust valve are closed, and the first adsorption tower enters the next process;
(3) Thermal oxygen desorption
At the bottom of a fourth adsorption tower which is performing an oxygen cooling process, high-temperature oxygen-enriched gas flowing out through a fourth oxygen cooling exhaust valve enters a hot oxygen pipeline, is further heated by an oxygen heater and then is sent into the first adsorption tower through an opened first hot oxygen desorption air inlet valve, so that an integral bed layer in the first adsorption tower is further cleaned and desorbed, the first hot oxygen desorption air outlet valve is opened, the oxygen-enriched gas flowing through the bed layer is sent to a user side for use through a product air pipeline, and then the first hot oxygen desorption air inlet valve and the first hot oxygen desorption air outlet valve are closed, and the first adsorption tower enters the next process;
(4) Oxygen cooling
And after the bed layer of the first adsorption tower is cooled, the fourth product gas exhaust valve, the first product gas exhaust valve and the fourth raw material gas intake valve are closed, and the first adsorption tower enters a next adsorption cycle.
Preferably, the cycle timing charts of the first adsorption column, the second adsorption column, the third adsorption column, and the fourth adsorption column are shown in the following table.
| First adsorption tower | Adsorption | Hot air desorption | Thermal oxygen desorption | Oxygen cooling |
| Second adsorption tower | Oxygen cooling | Adsorption | Hot air desorption | Thermal oxygen desorption |
| Third adsorption tower | Thermal oxygen desorption | Oxygen cooling | Adsorption | Hot air desorption |
| Fourth adsorption tower | Hot air desorption | Thermal oxygen desorption | Oxygen cooling | Adsorption |
Preferably, in the hot air desorption process, the air heater heats the air to 100 to 150 ℃.
Preferably, in the thermal oxygen desorption step, the outlet gas temperature of the oxygen heater is 100 to 150 ℃.
Preferably, in the oxygen cooling process, the amount of the oxygen cooling gas can be controlled by adjusting the gas flow rate on the mass flow controller, and the ratio of the cooling gas to the total product gas amount is between 0.1 and 1.
Preferably, in the oxygen cooling step, when all of the product gas is used as the cooling gas, all of the oxygen-rich gas flows out from the bottom of the adsorption column in which the oxygen heating step is performed, and is supplied to the user.
Preferably, in the hot air desorption process, the hot air for bed layer desorption realizes closed circulation between the adsorption tower and the air heater by using the circulating fan, so that the heat consumption is remarkably reduced.
Preferably, in the thermal oxygen desorption process, part of the heat source of the oxygen heater comes from the heat exchanged when the oxygen cools the bed layer in the step (4), so that part of the heat is saved.
Preferably, a series of electromagnetic valves are used for controlled opening and closing to realize switching among the processes.
Compared with the prior art, the invention has the beneficial effects that:
(1) The honeycomb-body-loaded oxygen production adsorbent monolithic adsorption bed is creatively adopted, and a temperature swing adsorption mode is adopted, so that the pressure resistance of the bed layer is reduced, and the oxygen production power consumption and the operation noise are reduced;
(2) According to the invention, waste heat is recycled in the hot air desorption process and the hot oxygen desorption process, so that the oxygen production energy consumption is further reduced;
(3) The invention utilizes the product gas with a certain proportion to carry out the procedures of bed layer cooling and oxygen cooling, can be still supplied to users for use after the two procedures are finished, and can utilize the product gas to the maximum extent while improving the desorption effect.
The invention is further illustrated by the following figures and detailed description of the invention, which are not meant to limit the scope of the invention.
Drawings
FIG. 1 is a schematic structural diagram of an integrated oxygen generation device based on temperature swing adsorption.
Main part names in the figure:
1A-first hot air desorption air inlet valve 1B-second hot air desorption air inlet valve
1C-third hot air desorption air inlet valve 1D-fourth hot air desorption air inlet valve
2A-first thermal oxygen desorption air inlet valve 2B-second thermal oxygen desorption air inlet valve
2C-third thermal oxygen desorption air inlet valve 2D-fourth thermal oxygen desorption air inlet valve
3A-first product gas exhaust valve 3B-second product gas exhaust valve
3C-third product gas exhaust valve 3D-fourth product gas exhaust valve
4A-first adsorption column 4B-second adsorption column
4C-third adsorption column 4D-fourth adsorption column
5A-first raw material gas inlet valve 5B-second raw material gas inlet valve
5C-third raw material gas inlet valve 5D-fourth raw material gas inlet valve
6A-first oxygen cooling exhaust valve 6B-second oxygen cooling exhaust valve
6C-third oxygen cooling exhaust valve 6D-fourth oxygen cooling exhaust valve
7A-first hot air desorption gas exhaust valve 7B-second hot air desorption gas exhaust valve
7C-third hot air desorption gas exhaust valve 7D-fourth hot air desorption gas exhaust valve
8A-first thermal oxygen desorption gas exhaust valve 8B-second thermal oxygen desorption gas exhaust valve
8C-third thermal oxygen desorption gas exhaust valve 8D-fourth thermal oxygen desorption gas exhaust valve
F-product gas 1 exhaust valve 9-air heater
10-oxygen heater 11-circulating fan
12-flow control valve 13-blower
Detailed Description
The parts used in the present invention are all commercially available parts which are conventional in the art, and the connection manner thereof is a conventional connection manner in the art, unless otherwise specified; the materials used are conventional in the art.
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
FIG. 1 is a schematic structural diagram of an integrated oxygen generator based on temperature swing adsorption; wherein 1A is a first hot air desorption air inlet valve, 1B is a second hot air desorption air inlet valve, 1C is a third hot air desorption air inlet valve, 1D is a fourth hot air desorption air inlet valve, 2A is a first hot oxygen desorption air inlet valve, 2B is a second hot oxygen desorption air inlet valve, 2C is a third hot oxygen desorption air inlet valve, 2D is a fourth hot oxygen desorption air inlet valve, 3A is a first product gas exhaust valve, 3B is a second product gas exhaust valve, 3C is a third product gas exhaust valve, 3D is a fourth product gas exhaust valve, 4A is a first adsorption tower, 4B is a second adsorption tower, 4C is a third adsorption tower, 4D is a fourth adsorption tower, 5A is a first raw material gas inlet valve, 5B is a second raw material gas inlet valve, and 5C is a third raw material gas inlet valve, 5D is a fourth raw material gas inlet valve, 6A is a first oxygen cooling exhaust valve, 6B is a second oxygen cooling exhaust valve, 6C is a third oxygen cooling exhaust valve, 6D is a fourth oxygen cooling exhaust valve, 7A is a first hot air desorption exhaust valve, 7B is a second hot air desorption exhaust valve, 7C is a third hot air desorption exhaust valve, 7D is a fourth hot air desorption exhaust valve, 8A is a first hot oxygen desorption exhaust valve, 8B is a second hot oxygen desorption exhaust valve, 8C is a third hot oxygen desorption exhaust valve, 8D is a fourth hot oxygen desorption exhaust valve, F is a product gas 1 exhaust valve, 9 is an air heater, 10 is an oxygen heater, 11 is a circulating fan, 12 is a flow regulating valve, and 13 is a blower;
the invention relates to an integral oxygen generating device based on temperature swing adsorption, a first adsorption tower 4A, a second adsorption tower 4B, a third adsorption tower 4C, a fourth adsorption tower 4D, a first hot air desorption air inlet valve 1A, a second hot air desorption air inlet valve 1B, a third hot air desorption air inlet valve 1C, a fourth hot air desorption air inlet valve 1D, a first hot oxygen desorption air inlet valve 2A, a second hot oxygen desorption air inlet valve 2B, a third hot oxygen desorption air inlet valve 2C, a fourth hot oxygen desorption air inlet valve 2D, a first product gas exhaust valve 3A, a second product gas exhaust valve 3B, a third product gas exhaust valve 3C, a fourth product gas exhaust valve 3D, a product gas 1 exhaust valve F, a first raw material gas inlet valve 5A, a second raw material gas inlet valve 5B, a first raw material gas outlet valve 5A, a second raw material gas inlet valve 5B, a second raw material gas outlet valve 3D, a second product gas outlet valve 3B, a second product gas outlet valve 3C, a second product gas outlet valve a third raw material gas inlet valve 5C, a fourth raw material gas inlet valve 5D, a first oxygen-cooled exhaust valve 6A, a second oxygen-cooled exhaust valve 6B, a third oxygen-cooled exhaust valve 6C, a fourth oxygen-cooled exhaust valve 6D, a first hot-air desorption gas exhaust valve 7A, a second hot-air desorption gas exhaust valve 7B, a third hot-air desorption gas exhaust valve 7C, a fourth hot-air desorption gas exhaust valve 7D, a first hot-oxygen desorption gas exhaust valve 8A, a second hot-oxygen desorption gas exhaust valve 8B, a third hot-oxygen desorption gas exhaust valve 8C, a fourth hot-oxygen desorption gas exhaust valve 8D, an air heater 9, an oxygen heater 10, a circulating fan 11, a flow rate regulating valve 12 and a blower 13; the blower 13 is connected to a first raw material gas inlet valve 5A arranged at the lower part of the first adsorption tower 4A, a second raw material gas inlet valve 5B arranged at the lower part of the second adsorption tower 4B, a third raw material gas inlet valve 5C arranged at the lower part of the third adsorption tower 4C, and a fourth raw material gas inlet valve 5D arranged at the lower part of the fourth adsorption tower 4D through a raw material gas path; one end of the air heater 9 is connected with the tops of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D through a hot air pipeline and the first hot air desorption air inlet valve 1A, the second hot air desorption air inlet valve 1B, the third hot air desorption air inlet valve 1C and the fourth hot air desorption air inlet valve 1D respectively; the other end of the air heater 9 is connected with one end of a circulating fan 11; the other end of the circulating fan 11 is connected with the bottoms of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D through a hot air pipeline and a first hot air desorption gas exhaust valve 7A, a second hot air desorption gas exhaust valve 7B, a third hot air desorption gas exhaust valve 7C and a fourth hot air desorption gas exhaust valve 7D respectively; one end of the oxygen heater 10 is connected with the tops of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D through a thermal oxygen pipeline, a first thermal oxygen desorption air inlet valve 2A, a second thermal oxygen desorption air inlet valve 2B, a third thermal oxygen desorption air inlet valve 2C and a fourth thermal oxygen desorption air inlet valve 2D respectively; the other end of the oxygen heater 10 is connected with the bottoms of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D through a hot oxygen pipeline and a first oxygen cooling exhaust valve 6A, a second oxygen cooling exhaust valve 6B, a third oxygen cooling exhaust valve 6C and a fourth oxygen cooling exhaust valve 6D respectively; a first product gas exhaust valve 3A, a second product gas exhaust valve 3B, a third product gas exhaust valve 3C and a fourth product gas exhaust valve 3D at the tops of a first adsorption tower 4A, a second adsorption tower 4B, a third adsorption tower 4C and a fourth adsorption tower 4D are connected with one end of a product gas 1 exhaust valve F through a cooling oxygen pipeline, and the other end of the product gas 1 exhaust valve F is connected with a flow regulating valve 12; a first hot oxygen desorption gas exhaust valve 8A, a second hot oxygen desorption gas exhaust valve 8B, a third hot oxygen desorption gas exhaust valve 8C and a fourth hot oxygen desorption gas exhaust valve 8D at the bottoms of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D are connected with each other through a product gas pipeline, and a product is sent out through the product gas pipeline;
the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D are filled with honeycomb system oxygen adsorbents which are integrally extruded or loaded by glass fiber base materials;
the honeycomb oxygen production adsorbent comprises but is not limited to FAU and LTA molecular sieves and oxygen production adsorbents obtained by modifying the molecular sieve ions; the honeycomb body is densely and orderly packed in the tower;
the honeycomb system oxygen adsorbent is tightly and orderly filled in the adsorption tower, so that the upstream and downstream pore canals of the module are aligned, and the increase of the flow resistance of a bed layer caused by the blockage of an air passage is reduced;
thermal insulation pipelines are laid on the outer walls of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D, and the outer walls of the raw material gas pipeline, the hot air pipeline, the hot oxygen pipeline and the like which can flow through hot air, so that heat loss is reduced, and energy consumption is reduced.
The integral oxygen generating device based on temperature swing adsorption enriches oxygen from air by a temperature swing adsorption method, and simultaneously desorbs nitrogen from an adsorbent by utilizing the characteristic that the adsorption quantity of an oxygen generating adsorbent is reduced when the temperature is raised.
The integral oxygen generator based on temperature swing adsorption can be four adsorption towers or more.
The integral oxygen generating device based on temperature swing adsorption is characterized in that an oxygen generating adsorbent with nitrogen-oxygen separation performance is extruded and molded into a honeycomb shape or loaded on honeycomb-shaped glass fibers to form the integral oxygen generating adsorbent, the integral honeycomb oxygen generating adsorbent is filled in an adsorption tower, and smooth circulation is ensured by means of honeycomb pore channel alignment and the like.
The invention relates to an integral oxygen generation method based on temperature swing adsorption, which comprises the following steps: four working procedures of adsorption, hot air desorption, hot oxygen desorption and oxygen cooling; the temperature swing adsorption oxygen generation process parameters are as follows: the temperature of the hot air for desorption in the hot air desorption process is 100-150 ℃; the temperature of the hot oxygen for further cleaning and desorption in the hot oxygen desorption process is 100-150 ℃; the hot air used in the hot air desorption step in the oxygen production process based on temperature swing adsorption realizes closed cycle between the air heater and the adsorption tower through the circulating fan, thereby obviously reducing the heat consumption;
the integral oxygen generator based on temperature swing adsorption comprises the following operation steps:
air, namely raw material gas, is subjected to necessary pretreatment, is pressurized by a blower 13, and is respectively fed into a first adsorption tower 4A, a second adsorption tower 4B, a third adsorption tower 4C and a fourth adsorption tower 4D (hereinafter referred to as adsorption towers) through a first raw material gas inlet valve 5A, a second raw material gas inlet valve 5B, a third raw material gas inlet valve 5C and a fourth raw material gas inlet valve 5D, and most of the oxygen is gathered to the tops of the adsorption towers after most of the nitrogen and a small part of the oxygen are adsorbed; a first product gas exhaust valve 3A, a second product gas exhaust valve 3B, a third product gas exhaust valve 3C and a fourth product gas exhaust valve 3D are opened, oxygen-enriched product gas flows into a cooling oxygen pipeline from the top of the tower, an exhaust valve F of the product gas 1 and a flow regulating valve 12 are opened at the moment, and part of the product gas is sent to a user side for use; meanwhile, a first product gas exhaust valve 3A on the top of a first adsorption tower 1A, a second product gas exhaust valve 3B on the top of a second adsorption tower 4B, a third product gas exhaust valve 3C on the top of a third adsorption tower 4C and a fourth product gas exhaust valve 3D on the top of a fourth adsorption tower 4D which are in an oxygen cooling process are opened, so that normal-temperature oxygen-enriched product gas enters the adsorption towers to cool high-temperature beds; the high-temperature oxygen-enriched product gas after heat exchange is discharged into a hot oxygen pipeline through a first oxygen cooling exhaust valve 6A, a second oxygen cooling exhaust valve 6B, a third oxygen cooling exhaust valve 6C and a fourth oxygen cooling exhaust valve 6D at the bottoms of a first adsorption tower 4A, a second adsorption tower 4B and a third adsorption tower 4C and a fourth adsorption tower 4D; after the oxygen-rich gas with higher temperature in the hot oxygen pipeline is heated to a specified temperature by the oxygen heater 10, the oxygen-rich gas enters the adsorption tower which is in the hot oxygen desorption process through the first hot oxygen desorption air inlet valve 2A, the second hot oxygen desorption air inlet valve 2B, the third hot oxygen desorption air inlet valve 2C and the fourth hot oxygen desorption air inlet valve 2D at the top of the adsorption tower, and the bed layer is further cleaned and desorbed; after heat exchange is completed, discharging the high-temperature oxygen-rich gas from a first hot oxygen desorption gas exhaust valve 8A, a second hot oxygen desorption gas exhaust valve 8B, a third hot oxygen desorption gas exhaust valve 8C and a fourth hot oxygen desorption gas exhaust valve 8D at the bottoms of the first adsorption tower 4A, the second adsorption tower 4B, the third adsorption tower 4C and the fourth adsorption tower 4D into a product gas pipeline, and sending the product gas pipeline to a user side for use; the hot air is pressurized by the circulating fan 11, after the air heater 9 is heated to a specified temperature, the hot air enters the adsorption tower to be subjected to air heating desorption through the first hot air desorption air inlet valve 1A, the second hot air desorption air inlet valve 1B, the third hot air desorption air inlet valve 1C and the fourth hot air desorption air inlet valve 1D on the hot air pipeline, the hot air and the bed layer complete heat exchange in the adsorption tower, the bed layer is heated, the hot air after heat exchange is discharged into the hot air pipeline again from the first hot air desorption air exhaust valve 7A, the second hot air desorption air exhaust valve 7B, the third hot air desorption air exhaust valve 7C and the fourth hot air desorption air exhaust valve 7D at the bottom of the adsorption tower, and the hot air is pressurized by the circulating fan 11 and heated by the oxygen heater 9 for recycling.
The following description will be given of a specific operation cycle by taking the adsorption tower 4A as an example:
(1) Adsorption
After the pressure of the blower 13 is increased, clean air which is filtered, dedusted, dried and dewatered by a filter is sent to a raw material gas pipeline, a first raw material gas inlet valve 5A is controlled to be opened, raw material gas enters a first adsorption tower 4A, nitrogen is adsorbed in the first adsorption tower 4A, oxygen is enriched, a first product gas exhaust valve 3A is opened, oxygen-enriched gas enters a cooling oxygen pipeline, a second product gas exhaust valve 3B and a second oxygen cooling exhaust valve 6B of a second adsorption tower 4B are opened, the oxygen-enriched product gas enters a cooling bed layer of the second adsorption tower 4B, a product gas 1 exhaust valve F is opened, a flow regulating valve 12 controls the outflow of the product gas 1, after the first adsorption tower 4A is adsorbed and saturated, the first raw material gas inlet valve 5A, the first product gas exhaust valve 3A, the second product gas exhaust valve 3B and the second oxygen cooling exhaust valve 6B are closed, and the first adsorption tower 4A enters the next working procedure;
(2) Hot air desorption
The hot air flowing out from the bottom of a fourth adsorption tower 4D executing a previous hot air desorption process enters a hot air pipeline, a fourth hot air desorption air inlet valve 1D and a fourth hot air desorption air exhaust valve 7D of the fourth adsorption tower 4D are closed, a first hot air desorption air inlet valve 1A and a first hot air desorption air exhaust valve 7A of the first adsorption tower 4A are opened, the hot air in the hot air pipeline passes through a circulating fan 11 and is sent to an air heater 9, the temperature is raised to a set value and then enters a heating bed layer of the first adsorption tower 4A through the first hot air desorption air inlet valve 1A of the first adsorption tower 4A for desorption, the exhausted air flows out of the first hot air desorption air exhaust valve 7A and is sent to the air heater 9 again by the circulating fan 11 for heating circulation until the hot air in the bed layer of the first adsorption tower 4A is desorbed, and then the first hot air desorption air inlet valve 1A and the first desorption air exhaust valve 7A are closed, and the first adsorption tower 4A enters a next process;
(3) Thermal oxygen desorption
The high-temperature oxygen-rich gas flowing out of the fourth adsorption tower 4D through the fourth oxygen cooling exhaust valve 6D enters a thermal oxygen pipeline, is further heated by an oxygen heater 10 and then is sent into the first adsorption tower 4A through the opened first thermal oxygen desorption intake valve 2A to further clean and desorb the integral bed layer in the first adsorption tower 4A, the first thermal oxygen desorption exhaust valve 8A is opened, the oxygen-rich gas flowing through the bed layer is sent to a user side for use (product gas 2) through the product pipeline, and then the first thermal oxygen desorption intake valve 2A and the first thermal oxygen desorption exhaust valve 8A are closed, and the first adsorption tower 4A enters the next process;
(4) Oxygen cooling
A fourth raw material gas inlet valve 5D of a fourth adsorption tower 4D is opened, nitrogen in the fourth adsorption tower 4D is adsorbed, oxygen is enriched at the top of the tower, a fourth product gas exhaust valve 3D and a first product gas exhaust valve 3A are opened, oxygen-enriched product gas flowing out of the top of the fourth adsorption tower 4D is sent into the first adsorption tower 4A, low-temperature oxygen-enriched product gas purges and cools a high-temperature bed layer in a bed to recover the adsorption capacity of the high-temperature bed layer, higher-temperature oxygen-enriched gas after heat exchange with the bed layer is discharged into a hot oxygen pipeline through a first oxygen-enriched gas exhaust valve 6A at the bottom of the first adsorption tower 4A, after the bed layer of the first adsorption tower 4A is cooled, the fourth product gas exhaust valve 3D, the first product gas exhaust valve 3A and the fourth raw material gas inlet valve 5D are closed, and the first adsorption tower 4A enters a next adsorption cycle;
repeating the steps (1) to (4), thus forming a complete cycle;
TABLE 1 Cyclic TIME-SEQUENCE TABLE
| |
Adsorption | Hot air desorption | Thermal oxygen desorption | Oxygen |
| Adsorption column | ||||
| 4B | Oxygen cooling | Adsorption | Hot air desorption | Thermal oxygen desorption |
| Adsorption tower4C | Thermal oxygen desorption | Oxygen cooling | Adsorption | Hot air |
| Adsorption column | ||||
| 4D | Hot air desorption | Thermal oxygen desorption | Oxygen cooling | Adsorption |
The air heater 9 heats the air and controls the temperature of the air to be 100-150 ℃;
the desorption effect is related to the heating temperature of the oxygen heater 10, and the higher the temperature is, the better the desorption effect is, but the higher the temperature is, the higher the energy consumption is, so the gas temperature at the outlet of the oxygen heater 10 is limited to 100-150 ℃.
The proportion of the cooling gas amount of the adsorption tower entering the oxygen cooling process to the total product gas amount is 10-100%; when all the product gas is used as cooling gas, all the oxygen-enriched gas flows out from the bottom of the adsorption tower for thermal oxygen desorption through the product gas pipeline and is supplied to users.
The invention provides an integral oxygen generating device and an oxygen generating method based on temperature swing adsorption, wherein an integral honeycomb oxygen generating adsorbent which is integrally extruded and molded or prepared by coating and loading glass fiber and other base materials is filled in the integral oxygen generating device; the oxygen generation method is a multi-tower type and realizes an oxygen generation process flow by utilizing temperature swing adsorption. The oxygen generation mode provided by the invention obviously reduces the oxygen generation energy consumption and reduces the operation noise.
The invention relates to an integral oxygen generating device and an oxygen generating method based on temperature swing adsorption, which comprise a blower, 4 adsorption towers filled with integral honeycomb oxygen generating adsorbents, an air heater, an oxygen heater, a circulating fan, an electromagnetic valve, a flow regulating valve and necessary pipeline connections. One path of air is sent to the adsorption tower to adsorb nitrogen and enrich oxygen; the enriched oxygen is firstly sent to an adsorption tower to be cooled, and the bed layer is cooled under the protection of oxygen-enriched gas; the oxygen-enriched product gas flowing out of the adsorption tower to be cooled is subjected to heat exchange temperature rise, is heated to a higher temperature by an oxygen heater, is sent to the adsorption tower in the thermal oxygen desorption process for heating, reduces the partial pressure of nitrogen to ensure that a bed layer is more fully desorbed and is then sent to a user side for use; and the other path of air is heated by an air heater and then is sent to a hot air heating adsorption tower to heat a bed layer, and the low-temperature exhaust gas is sent to the air heater again by a circulating fan to be heated for recycling. The integral oxygen generation device and the oxygen generation method based on temperature swing adsorption adopt the integral oxygen generation adsorbent with lower bed pressure resistance, and the heat source can be from waste heat recovery, so the oxygen generation energy consumption and the operation noise can be obviously reduced.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit of the invention, and these modifications should be construed as within the scope of the invention.
Claims (10)
1. The utility model provides an integral oxygenerator based on temperature swing adsorption which characterized in that: the system comprises a first adsorption tower, a second adsorption tower, a third adsorption tower, a fourth adsorption tower, a first hot air desorption air inlet valve, a second hot air desorption air inlet valve, a third hot air desorption air inlet valve, a fourth hot air desorption air inlet valve, a first hot oxygen desorption air inlet valve, a second hot oxygen desorption air inlet valve, a third hot oxygen desorption air inlet valve, a fourth hot oxygen desorption air inlet valve, a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve, a fourth product gas exhaust valve, a first raw material gas inlet valve, a second raw material gas inlet valve, a third raw material gas inlet valve, a fourth raw material gas inlet valve, a first oxygen desorption air exhaust valve, a second oxygen cooling exhaust valve, a fourth oxygen cooling exhaust valve, a first hot air desorption air exhaust valve, a second hot air desorption air exhaust valve, a third hot air desorption air exhaust valve, a fourth hot oxygen desorption air desorption exhaust valve, a first hot oxygen exhaust valve, a second hot oxygen desorption air heater, a fourth hot oxygen desorption air heater, a circulating oxygen flow rate fan and a circulating oxygen flow rate fan; the air feeder is respectively connected with a first raw material gas inlet valve arranged at the lower part of the first adsorption tower, a second raw material gas inlet valve arranged at the lower part of the second adsorption tower, a third raw material gas inlet valve arranged at the lower part of the third adsorption tower and a fourth raw material gas inlet valve arranged at the lower part of the fourth adsorption tower through a raw material gas path; one end of the air heater is connected with the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower respectively through a hot air pipeline, a first hot air desorption air inlet valve, a second hot air desorption air inlet valve, a third hot air desorption air inlet valve and a fourth hot air desorption air inlet valve; the other end of the air heater is connected with one end of the circulating fan; the other end of the circulating fan is respectively connected with the bottoms of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower through a hot air pipeline and a first hot air desorption gas exhaust valve, a second hot air desorption gas exhaust valve, a third hot air desorption gas exhaust valve and a fourth hot air desorption gas exhaust valve; one end of the oxygen heater is respectively connected with the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower through a hot oxygen pipeline and a first hot oxygen desorption air inlet valve, a second hot oxygen desorption air inlet valve, a third hot oxygen desorption air inlet valve and a fourth hot oxygen desorption air inlet valve; the other end of the oxygen heater is respectively connected with the bottoms of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower through a hot oxygen pipeline and a first oxygen cooling exhaust valve, a second oxygen cooling exhaust valve, a third oxygen cooling exhaust valve and a fourth oxygen cooling exhaust valve; a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve and a fourth product gas exhaust valve at the tops of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower are connected with one end of the product gas exhaust valve through a cooling oxygen pipeline, and the other end of the product gas exhaust valve is connected with a flow regulating valve; and the first thermal oxygen desorption gas exhaust valve, the second thermal oxygen desorption gas exhaust valve, the third thermal oxygen desorption gas exhaust valve and the fourth thermal oxygen desorption gas exhaust valve at the bottoms of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower are connected with each other through product gas pipelines and are connected with the product gas pipelines.
2. The integrated temperature swing adsorption-based oxygen generation device according to claim 1, wherein the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower are filled with honeycomb system oxygen adsorbents which are integrally extruded or loaded by glass fiber substrates.
3. The integrated temperature swing adsorption-based oxygen generation plant according to claim 2, wherein the honeycomb system oxygen adsorbent comprises but is not limited to FAU and LTA molecular sieves and oxygen generation adsorbents obtained by modifying based on the molecular sieve ions.
4. The integrated temperature swing adsorption-based oxygen plant according to claim 3, wherein the honeycomb body is densely and orderly packed in the column with the upstream and downstream cells aligned.
5. The integrated oxygen generation device based on temperature swing adsorption according to claim 4, wherein the outer walls of the first adsorption tower, the second adsorption tower, the third adsorption tower and the fourth adsorption tower, and the outer walls of the raw material gas pipeline, the hot air pipeline and the hot oxygen pipeline are provided with heat insulation pipelines.
6. The method for producing oxygen based on the temperature swing adsorption integrated oxygen plant of any of claims 1-5, comprising the steps of:
(1) Adsorption;
(2) Desorbing by hot air;
(3) Thermal oxygen desorption;
(4) Cooling with oxygen;
the process parameters are as follows: the temperature of hot air for desorption in the hot air desorption process is 100-150 ℃; the temperature of the hot oxygen for further cleaning and desorption in the hot oxygen desorption process is 100-150 ℃; and the hot air used in the hot air desorption step realizes closed cycle between the air heater and the adsorption tower through the circulating fan.
7. The oxygen generation method based on the temperature swing adsorption integrated oxygen generation device of any one of claims 1-5, which comprises the following specific steps:
air, namely raw material gas, is subjected to necessary pretreatment, is pressurized by a blower, and is respectively sent into four adsorption towers through a first raw material gas inlet valve, a second raw material gas inlet valve, a third raw material gas inlet valve and a fourth raw material gas inlet valve, and most of the oxygen is converged at the top of the adsorption towers after most of the nitrogen and a small part of the oxygen are adsorbed; a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve and a fourth product gas exhaust valve are opened, oxygen-enriched product gas flows into the cooling oxygen pipeline from the top of the tower, the product gas exhaust valve and the flow regulating valve are opened at the moment, and part of the product gas is sent to a user side for use; meanwhile, a first product gas exhaust valve, a second product gas exhaust valve, a third product gas exhaust valve and a fourth product gas exhaust valve which are in the oxygen cooling process are opened, and normal-temperature oxygen-enriched product gas enters an adsorption tower to cool a high-temperature bed layer; the high-temperature oxygen-enriched product gas after heat exchange is discharged into a hot oxygen pipeline through a first oxygen cooling exhaust valve, a second oxygen cooling exhaust valve, a third oxygen cooling exhaust valve and a fourth oxygen cooling exhaust valve; after the higher-temperature oxygen-enriched gas in the hot oxygen pipeline is heated to a specified temperature by an oxygen heater, the higher-temperature oxygen-enriched gas enters the adsorption tower which is in the hot oxygen desorption process through a first hot oxygen desorption air inlet valve, a second hot oxygen desorption air inlet valve, a third hot oxygen desorption air inlet valve and a fourth hot oxygen desorption air inlet valve at the top of the adsorption tower, and the bed layer is further cleaned and desorbed; after heat exchange is completed, the high-temperature oxygen-rich gas is discharged into a product gas pipeline from a first hot oxygen desorption gas exhaust valve, a second hot oxygen desorption gas exhaust valve, a third hot oxygen desorption gas exhaust valve and a fourth hot oxygen desorption gas exhaust valve at the bottom of the adsorption tower and is sent to a user side for use; the hot air is pressurized by the circulating fan, the air heater is heated to a specified temperature, then the hot air enters the adsorption tower to be subjected to air heating desorption through the first hot air desorption air inlet valve, the second hot air desorption air inlet valve, the third hot air desorption air inlet valve and the fourth hot air desorption air inlet valve on the hot air pipeline, the hot air and the bed layer in the adsorption tower are subjected to heat exchange, the temperature of the bed layer is increased, the hot air subjected to heat exchange is discharged into the hot air pipeline again from the first hot air desorption air exhaust valve, the second hot air desorption air exhaust valve, the third hot air desorption air exhaust valve and the fourth hot air desorption air exhaust valve at the bottom of the adsorption tower, and the hot air is pressurized by the circulating fan and heated by the oxygen heater for cyclic use.
8. The method for producing oxygen based on the temperature swing adsorption integrated oxygen plant according to any one of claims 1-5, wherein the work flow of the first adsorption tower is as follows:
(1) Adsorption
After the pressure of a blower is increased, clean air which is filtered, dedusted, dried and dewatered by a filter is sent to a raw material gas pipeline, a first raw material gas inlet valve is controlled to be opened, so that raw material gas enters a first adsorption tower, nitrogen is adsorbed in the first adsorption tower, oxygen is enriched, a first product gas exhaust valve is opened, oxygen-enriched gas enters a cooling oxygen pipeline, a second product gas exhaust valve and a second oxygen cooling exhaust valve of a second adsorption tower are opened, oxygen-enriched product gas enters a cooling bed layer of the second adsorption tower, a product gas exhaust valve is opened, a flow regulating valve controls the product gas flow output, after the first adsorption tower is adsorbed and saturated, a first raw material gas inlet valve, a first product gas exhaust valve, a second product gas exhaust valve and a second oxygen cooling exhaust valve are closed, and the first adsorption tower enters the next working procedure;
(2) Hot air desorption
Hot air flowing out from the bottom of a fourth adsorption tower which executes a previous hot air desorption process enters a hot air pipeline, a fourth hot air desorption air inlet valve and a fourth hot air desorption air exhaust valve of the fourth adsorption tower are closed, a first hot air desorption air inlet valve and a first hot air desorption air exhaust valve of the first adsorption tower are opened, hot air in the hot air pipeline is sent to an air heater after passing through a circulating fan, the temperature is raised to a set value and then enters a heating desorption bed layer of the first adsorption tower through the first hot air desorption air inlet valve of the first adsorption tower, exhausted air flows out from the first hot air desorption air exhaust valve and then is sent to the air heater again for heating circulation by the circulating fan until the hot air desorption of the bed layer of the first adsorption tower is finished, and then the first hot air desorption air inlet valve and the first hot air desorption air exhaust valve are closed, and the first adsorption tower enters the next process;
(3) Thermal oxygen desorption
At the bottom of a fourth adsorption tower which is performing an oxygen cooling process, high-temperature oxygen-rich gas flowing out through a fourth oxygen cooling exhaust valve enters a thermal oxygen pipeline, is further heated by an oxygen heater and then is sent to a first adsorption tower through an opened first thermal oxygen desorption air inlet valve, so that an integral bed layer in the first adsorption tower is further cleaned and desorbed, the first thermal oxygen desorption air outlet valve is opened, the oxygen-rich gas flowing through the bed layer is sent to a user side for use through a product air pipeline, and then the first thermal oxygen desorption air inlet valve and the first thermal oxygen desorption air outlet valve are closed, and the first adsorption tower enters the next process;
(4) Oxygen cooling
And after the bed layer of the first adsorption tower is cooled, the fourth product gas exhaust valve, the first product gas exhaust valve and the fourth raw material gas intake valve are closed, and the first adsorption tower enters a next adsorption cycle.
9. The method of claim 8, wherein the cycle timing of the first adsorption column, the second adsorption column, the third adsorption column, and the fourth adsorption column is as shown in the table.
10. The method for producing oxygen from the integrated temperature swing adsorption-based oxygen plant according to claim 9, wherein in the hot air desorption process, the air heater heats the air to 100-150 ℃; in the thermal oxygen desorption process, the temperature of the outlet gas of the oxygen heater is 100-150 ℃; in the oxygen cooling procedure, the proportion of cooling gas to the total product gas is between 0.1 and 1; in the oxygen cooling process, when all the product gas is used as cooling gas, all the oxygen-rich gas flows out from the bottom of the adsorption tower for the oxygen heating process and is supplied to users; in the hot air desorption process, the hot air for bed layer desorption realizes closed circulation between the adsorption tower and the air heater by utilizing a circulating fan; in the thermal oxygen desorption process, part of the heat source of the oxygen heater comes from the heat exchanged when the oxygen cools the bed layer.
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