CN217450092U - Circulating gas return deoxidation system for high-oxygen-content gas - Google Patents
Circulating gas return deoxidation system for high-oxygen-content gas Download PDFInfo
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- CN217450092U CN217450092U CN202220203580.4U CN202220203580U CN217450092U CN 217450092 U CN217450092 U CN 217450092U CN 202220203580 U CN202220203580 U CN 202220203580U CN 217450092 U CN217450092 U CN 217450092U
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Abstract
The utility model relates to a gaseous deoxidation system of returning gas of circulation for high oxygen content, including main gas circuit and the circulation gas circuit that communicates mutually with main gas circuit, be equipped with first gas-liquid separation buffer tank, deoxygenator, second gas-liquid separation buffer tank along the air current direction on the main gas circuit in proper order, be equipped with the circulating gas compressor on the circulation gas circuit, the end of giving vent to anger of circulation gas circuit intersects in the upper reaches of first gas-liquid separation buffer tank with main gas circuit, and the inlet end intersects in the low reaches of second gas-liquid separation buffer tank with main gas circuit. Compared with the prior art, the utility model discloses a method that the circulation was returned gas has reduced the content of oxygen in the feed gas, makes the temperature rise of deoxidation reaction obtain effective control to make the skew explosion range of feed gas component, the system operation is safer.
Description
Technical Field
The utility model belongs to the technical field of gaseous deoxidation, a gaseous circulation deoxidation system of returning gas that is used for high oxygen content is related to.
Background
The chemical industry, the electronic industry, the fuel automobile industry and the like all need to use a large amount of hydrogen with higher purity. The hydrogen sources mainly comprise hydrogen production by water electrolysis, hydrogen production by natural gas, hydrogen production by methanol conversion, propane dehydrogenation and purification of hydrogen-containing gas sources. The hydrogen prepared by the methods usually contains impurities such as oxygen, and particularly in crude hydrogen which is prepared by electrolyzing water to prepare hydrogen and is purified by coke oven gas after pressure swing adsorption, the oxygen content is basically about 0.8-1.2 percent, and if the oxygen is not removed, the hydrogen product is difficult to directly use. Pt/Al-containing alloy is widely used in industry 2 O 3 The fixed bed reactor of the catalyst is used for reaction and deoxidation, and the index of less than 1ppm can be achieved. However, if the oxygen content in the gas source is high, the oxygen cannot be removed by the fixed bed catalytic reaction. For example, 1% of oxygen is removed from the hydrogen-rich gas, the theoretical temperature rise is 165 ℃, the oxygen content in the sodium chlorate hydrogen-rich tail gas is 3-4%, if 4% of oxygen is to be removed completely, the theoretical temperature rise is 660 ℃, the use temperature of the deoxidation catalyst is exceeded, and the cost of equipment material selection is increased, so that fixed bed catalytic reaction deoxidation cannot be adopted, and only a deoxidation method with higher cost can be adopted.
Therefore, there is a need for a technology that can remove oxygen from a gas having a high oxygen content at a low cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gaseous circulation of returning gas deoxidation system for high oxygen content. The utility model discloses carry out the part with higher oxygen content's gas and product gas and mix to reduce the oxygen content in the feed gas, and then accessible fixed bed catalytic reaction deoxidization.
The purpose of the utility model can be realized through the following technical scheme:
a circulating return gas deoxidation system for high-oxygen-content gas comprises a main gas path and a circulating gas path communicated with the main gas path, wherein a first gas-liquid separation buffer tank, a deoxygenator and a second gas-liquid separation buffer tank are sequentially arranged on the main gas path along the direction of gas flow, a circulating gas compressor is arranged on the circulating gas path, the gas outlet end of the circulating gas path is intersected with the main gas path at the upstream of the first gas-liquid separation buffer tank, and the gas inlet end is intersected with the main gas path at the downstream of the second gas-liquid separation buffer tank.
Further, the main gas circuit comprises a raw material gas inlet pipeline and a product gas outlet pipeline, the deoxygenator is positioned between the raw material gas inlet pipeline and the product gas outlet pipeline, the first gas-liquid separation buffer tank is arranged on the raw material gas inlet pipeline, and the second gas-liquid separation buffer tank is arranged on the product gas outlet pipeline.
Furthermore, an electric heater is arranged on the raw material gas inlet pipeline and is positioned between the first gas-liquid separation buffer tank and the deoxygenator.
Furthermore, the electric heater is a start-up electric heater.
Furthermore, a water cooler is arranged on the product gas outlet pipeline and is positioned between the deoxygenator and the second gas-liquid separation buffer tank.
Furthermore, a heat exchanger matched with the feed gas inlet pipeline and the product gas outlet pipeline is arranged on the feed gas inlet pipeline.
Further, the air inlet of the deoxygenator is communicated with the electric heater through a heat exchanger, and the air outlet of the deoxygenator is communicated with the water cooler through the heat exchanger.
Or the air inlet of the deoxygenator is communicated with the heat exchanger through an electric heater, and the air outlet of the deoxygenator is communicated with the heat exchanger through a water cooler. The electric heater, the water cooler and the heat exchanger can be used in a matched mode or independently.
Furthermore, the deoxygenator contains Pt/Al 2 O 3 Fixed bed reactor of catalyst.
A circulating return gas deoxidation method for high oxygen content gas is based on the system, and comprises the following steps: the oxygen in the raw gas containing oxygen is removed by a deoxygenator to obtain a product gas, and part of the product gas is led out and mixed with the raw gas to reduce the oxygen content in the raw gas.
The utility model discloses can return the method of gas through the circulation with the gas of higher oxygen content among the industrial gas, make the oxygen content in the feed gas drop to 1%, the oxygen desorption in the rethread fixed bed catalytic reaction method in with the feed gas. The utility model can adopt Pt/Al contained in industrial wide application 2 O 3 The fixed bed reactor of the catalyst removes 1 percent of oxygen, the reaction temperature is increased by 165 ℃, and in the application range of the deoxidation catalyst, equipment can be made of Q345R, thereby reducing the investment cost.
The specific implementation process is as follows:
the raw gas comes from an outer pipe network of a boundary area, is firstly mixed with a returned part of product gas and enters a first gas-liquid separation buffer tank, then passes through an electric heater, and then is heated to a temperature higher than the dew point temperature by 10-20 ℃ in a heat exchanger and enters a deoxygenator, and oxygen and hydrogen react under the action of a catalyst in the deoxygenator as follows:
H 2 +O 2 →H 2 O
and simultaneously, reaction heat is released, after heat exchange is carried out on the reaction heat and the mixed raw material gas before entering the deoxygenator, the reaction heat is cooled to normal temperature through a water cooler, and then the reaction heat is sent out of a system boundary area through a second gas-liquid separation buffer tank. Wherein, part of the product gas is pressurized by a recycle gas compressor and returned to be mixed with the raw material gas through flow control so as to adjust the oxygen content in the raw material gas for the fixed bed catalytic deoxidation reaction.
Compared with the prior art, the utility model has the characteristics of it is following:
1) the utility model has simple flow, reduces the oxygen content in the raw material gas by a circular gas return method, effectively controls the temperature rise of the deoxidation reaction, enables the components of the raw material gas to deviate from the explosion range, and ensures safer system operation;
2) the utility model discloses can realize the deoxidation of higher concentration raw materials industrial gas, can't adopt the fixed bed catalytic reaction deoxidation method ripe and that the investment is low when having solved the oxygen content height among the raw materials industrial gas, deoxidation catalyst can adopt the Pt Al of industrial wide use 2 O 3 The material of the catalyst and the deoxygenator can be selected from Q345R.
3) The utility model discloses can also avoid the oxygen content in the feed gas undulant simultaneously, cause circumstances such as deoxidation reaction temperature runaway, guarantee the safe in utilization of equipment.
4) The utility model discloses enable catalytic deoxidation reaction and keep going on under the stable condition of temperature all the time, make catalyst life extension.
5) The utility model discloses a mode that heat and feed gas carried out the heat transfer after the deoxidation has preheated the feed gas, can protect the deoxidation catalyst, improves the catalytic effect of deoxidation catalyst, and then can not use electric heater, reduces the temperature of product gas after the deoxidation simultaneously, reduces the load of water cooler, makes the whole more energy-conserving of system.
Drawings
FIG. 1 is a schematic diagram of the deoxidation system of the present invention;
the notation in the figure is:
the system comprises a main gas path 1, a raw gas inlet path 101, a raw gas inlet path 102, a product gas outlet path 102, a first gas-liquid separation buffer tank 2, an electric heater 3, a heat exchanger 4, a deoxygenator 5, a water cooler 6, a second gas-liquid separation buffer tank 7, a circulating gas compressor 8 and a circulating gas path 9.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The utility model provides a gaseous deoxidation system of returning to circulation for high oxygen content, as shown in figure 1, including main gas circuit 1 and the circulation gas circuit 9 that is linked together with main gas circuit 1, be equipped with first gas-liquid separation buffer tank 2 along the air current direction in proper order on main gas circuit 1, oxygen remover 5, second gas-liquid separation buffer tank 7, be equipped with circulation gas compressor 8 on the circulation gas circuit 9, the end of giving vent to anger of circulation gas circuit 9 intersects in the upper reaches of first gas-liquid separation buffer tank 2 with main gas circuit 1, the inlet end intersects in the low reaches of second gas-liquid separation buffer tank 7 with main gas circuit 1.
The main gas circuit 1 comprises a raw gas inlet pipeline 101 and a product gas outlet pipeline 102, the deoxygenator 5 is positioned between the raw gas inlet pipeline 101 and the product gas outlet pipeline 102, the first gas-liquid separation buffer tank 2 is arranged on the raw gas inlet pipeline 101, and the second gas-liquid separation buffer tank 7 is arranged on the product gas outlet pipeline 102. The raw material gas inlet pipeline 101 is provided with an electric heater 3, and the electric heater 3 is positioned between the first gas-liquid separation buffer tank 2 and the deoxygenator 5. The electric heater 3 is a start-up electric heater. The product gas outlet pipeline 102 is provided with a water cooler 6, and the water cooler 6 is positioned between the deoxygenator 5 and the second gas-liquid separation buffer tank 7.
The raw gas inlet pipeline 101 is provided with a heat exchanger 4 matched with the raw gas inlet pipeline 101 and the product gas outlet pipeline 102.
The air inlet of the deoxygenator 5 is communicated with the electric heater 3 through the heat exchanger 4, and the air outlet of the deoxygenator 5 is communicated with the water cooler 6 through the heat exchanger 4. Or the air inlet of the deoxygenator 5 is communicated with the heat exchanger 4 through the electric heater 3, and the air outlet of the deoxygenator 5 is communicated with the heat exchanger 4 through the water cooler 6.
The deoxygenator 5 is Pt/Al-containing 2 O 3 Fixed bed reactor of catalyst.
The utility model discloses simultaneously provide a gaseous deoxidation method of returning gas of circulation for high oxygen content, the method is: the oxygen in the raw gas containing oxygen is removed by the deoxygenator 5 to obtain the product gas, and part of the product gas is led out and mixed with the raw gas to reduce the oxygen content in the raw gas.
The utility model discloses a method that circulates and returns gas controls the oxygen content in the feed gas, makes the oxygen in the high concentration feed gas pass through fixed bed catalytic reaction desorption, and the heat energy recycle after the deoxidation.
Example (b):
the flow rate of the electrolytic sodium chlorate hydrogen-rich tail gas from the outer pipeline of the battery limits is 500Nm 3 H, pressure 0.6MPa, the composition is as follows:
| make up of | H 2 | O 2 | H 2 O | CO 2 | In total |
| V％ | 94 | 3 | 2 | 1 | 100 |
| Nm 3 /h | 470 | 15 | 10 | 5 | 500 |
1000Nm of raw gas returned from the compressor 8 of the recycle gas 3 After hydrogen mixing, the total mixed gas flow is 1500Nm 3 The reaction is carried out by the following steps of/h, the pressure is 0.6Mpa, the oxygen content is 1%, then the reaction enters a first gas-liquid separation buffer tank 2, the temperature is heated to 100 ℃ by an electric heater 3, the reaction enters a deoxygenator 5, and oxygen and hydrogen react under the action of a catalyst in the deoxygenator 5 as follows:
H 2 +O 2 →H 2 O
and simultaneously, reaction heat is emitted, and after heat exchange is carried out on the mixed raw material gas before entering the deoxygenator 5, the mixed raw material gas is cooled to normal temperature through a water cooler 6 and is sent out of a system boundary area.
After the circulation gas return process, the oxygen content in the reaction gas entering the deoxygenator 5 is controlled, so that the temperature after deoxygenation is always maintained at 150-.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (9)
1. The utility model provides a circulation returning gas deoxidation system for high oxygen content gas which characterized in that, this system includes main gas circuit (1) and circulation gas circuit (9) that are linked together with main gas circuit (1), main gas circuit (1) go up and be equipped with first gas-liquid separation buffer tank (2), deoxygenator (5), second gas-liquid separation buffer tank (7) along the air current direction in proper order, circulation gas circuit (9) on be equipped with circulation gas compressor (8), circulation gas circuit (9) give vent to anger the end and intersect in the upper reaches of first gas-liquid separation buffer tank (2) with main gas circuit (1), the inlet end intersects in the low reaches of second gas-liquid separation buffer tank (7) with main gas circuit (1).
2. The system of claim 1, wherein the main gas path (1) comprises a raw gas inlet pipeline (101) and a product gas outlet pipeline (102), the deoxygenator (5) is located between the raw gas inlet pipeline (101) and the product gas outlet pipeline (102), the first gas-liquid separation buffer tank (2) is disposed on the raw gas inlet pipeline (101), and the second gas-liquid separation buffer tank (7) is disposed on the product gas outlet pipeline (102).
3. The system for the circulating return gas deoxygenation of the high oxygen content gas according to claim 2, wherein the raw gas inlet pipeline (101) is provided with an electric heater (3), and the electric heater (3) is located between the first gas-liquid separation buffer tank (2) and the deoxygenator (5).
4. A system for the cyclic return gas deoxygenation of a high oxygen content gas according to claim 3, characterized in that said electric heater (3) is a start-up electric heater.
5. The system for the circulating return gas deoxygenation of a high oxygen content gas as claimed in claim 3, wherein the product gas outlet pipeline (102) is provided with a water cooler (6), and the water cooler (6) is located between the deoxygenator (5) and the second gas-liquid separation buffer tank (7).
6. The circulating return gas deoxygenation system for high-oxygen content gas according to claim 5, wherein the feed gas inlet pipeline (101) is provided with a heat exchanger (4) matched with the feed gas inlet pipeline (101) and the product gas outlet pipeline (102).
7. The system for the circulating return gas deoxidation of the high oxygen content gas as recited in claim 6, wherein the gas inlet of the deoxygenator (5) is communicated with the electric heater (3) through the heat exchanger (4), and the gas outlet of the deoxygenator (5) is communicated with the water cooler (6) through the heat exchanger (4).
8. The system for the cyclic return gas deoxygenation of a high oxygen content gas as claimed in claim 6, wherein the gas inlet of the deoxygenator (5) is communicated with the heat exchanger (4) through the electric heater (3), and the gas outlet of the deoxygenator (5) is communicated with the heat exchanger (4) through the water cooler (6).
9. The system for the cyclic return gas deoxygenation of a high oxygen content gas as claimed in claim 1, wherein the deoxygenator (5) is Pt/Al containing 2 O 3 Fixed bed reactor of catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220203580.4U CN217450092U (en) | 2022-01-25 | 2022-01-25 | Circulating gas return deoxidation system for high-oxygen-content gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220203580.4U CN217450092U (en) | 2022-01-25 | 2022-01-25 | Circulating gas return deoxidation system for high-oxygen-content gas |
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| Publication Number | Publication Date |
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| CN217450092U true CN217450092U (en) | 2022-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220203580.4U Active CN217450092U (en) | 2022-01-25 | 2022-01-25 | Circulating gas return deoxidation system for high-oxygen-content gas |
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| CN (1) | CN217450092U (en) |
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