CN216404319U - Waste gas recovery system for separating carbon dioxide and nitrogen by utilizing flue gas - Google Patents
Waste gas recovery system for separating carbon dioxide and nitrogen by utilizing flue gas Download PDFInfo
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- CN216404319U CN216404319U CN202122516807.9U CN202122516807U CN216404319U CN 216404319 U CN216404319 U CN 216404319U CN 202122516807 U CN202122516807 U CN 202122516807U CN 216404319 U CN216404319 U CN 216404319U
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Abstract
The utility model provides a waste gas recovery system for separating carbon dioxide and nitrogen by using flue gas. The system comprises: the purification device is used for purifying flue gas generated by the coke oven; the pretreatment system is connected with the purification device and is used for dehydrating and cooling the purified flue gas; the carbon and nitrogen separation system is connected with the pretreatment system and is used for pressure swing adsorption of the pretreated flue gas and separation of nitrogen-containing vent gas and crude carbon dioxide gas; the nitrogen purification system is connected with the carbon and nitrogen separation system and is used for purifying the nitrogen-containing vent gas separated by the carbon and nitrogen separation system; and the natural gas synthesis system is connected with the carbon-nitrogen separation system and is connected with the hydrogen-rich gas source and used for preparing the natural gas by adopting the crude carbon dioxide gas and the hydrogen-rich gas separated by the carbon-nitrogen separation system. The system can recover carbon dioxide and nitrogen to the maximum extent, and is energy-saving and environment-friendly.
Description
Technical Field
The utility model belongs to the technical field of recycling of boiler flue gas, and particularly relates to a waste gas recycling system for separating carbon dioxide and nitrogen by utilizing flue gas.
Background
In the coking production, coke oven waste gas (namely flue gas) is generated and contains various gases such as carbon dioxide, nitrogen oxide, carbon monoxide and the like, and the waste gas is generally treated and directly discharged through a chimney after reaching the discharge standard. However, the waste gas contains nitrogen and carbon dioxide, which are common materials for ammonia synthesis and liquefied natural gas production, and the direct discharge of the two gases causes waste and certain pollution to the atmosphere.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a waste gas recovery system for separating carbon dioxide and nitrogen by using flue gas, which aims to solve the problems of waste and pollution to the atmosphere caused by waste gas emission at present.
In order to achieve the above purpose, the utility model provides the following technical scheme:
an exhaust gas recovery system for separating carbon dioxide and nitrogen using flue gas, the system comprising:
a purification device for purifying flue gas generated by the coke oven;
the pretreatment system is connected with the purification device and is used for dehydrating and cooling the purified flue gas;
the carbon and nitrogen separation system is connected with the pretreatment system and is used for pressure swing adsorption of the pretreated flue gas and separation of nitrogen-containing vent gas and crude carbon dioxide gas;
the nitrogen purification system is connected with the carbon and nitrogen separation system and is used for purifying the nitrogen-containing vent gas separated by the carbon and nitrogen separation system;
and the natural gas synthesis system is connected with the carbon and nitrogen separation system, is connected with a hydrogen-rich gas source, and is used for preparing natural gas by adopting the crude carbon dioxide gas and the hydrogen-rich gas separated by the carbon and nitrogen separation system.
The flue gas recovery system for separating carbon dioxide and nitrogen using flue gas as described above, optionally, the natural gas synthesis system comprises:
the gas inlet of the mixed gas holder is connected with the carbon-nitrogen separation system and the hydrogen-rich gas source and is used for mixing the carbon dioxide gas and the hydrogen-rich gas separated by the carbon-nitrogen separation system to obtain a mixed gas;
the inlet of the mixed gas compressor is connected with the outlet of the mixed gas tank;
the gas inlet of the methane synthesis reactor is connected with the outlet of the mixed gas compressor and is used for enabling hydrogen in the mixed gas to react with carbon dioxide to produce methane;
the inlet of the liquefaction separation device is connected with the gas outlet of the methane synthesis reactor and is used for separating liquefied natural gas and hydrogen-rich gas from the methanated mixed gas;
and the liquefied natural gas storage tank is connected with the liquefied natural gas outlet of the liquefaction separation device.
In the above exhaust gas recovery system for separating carbon dioxide and nitrogen gas using flue gas, the hydrogen-rich gas outlet of the liquefaction separation unit is optionally connected to the gas inlet of the gas mixture tank.
In the above waste gas recovery system for separating carbon dioxide and nitrogen gas by using flue gas, optionally, a desulfurization purification tower is further disposed between the mixed gas compressor and the methane synthesis reactor, an air inlet of the desulfurization purification tower is connected to an air outlet of the mixed gas compressor, and an air outlet of the desulfurization purification tower is connected to an air inlet of the methane synthesis reactor, so as to perform desulfurization purification treatment on the mixed gas.
According to the above waste gas recovery system for separating carbon dioxide and nitrogen by using flue gas, optionally, a drying and purifying device is further disposed between the methane synthesis reactor and the liquefaction separation device, an air inlet of the drying and purifying device is connected to an air outlet of the methane synthesis reactor, and an air outlet of the drying and purifying device is connected to an air inlet of the liquefaction separation device, so as to dry and purify the methanated mixed gas.
The flue gas recovery system for separating carbon dioxide and nitrogen using flue gas as described above, optionally, the drying and purifying device is a drying tower filled with a molecular sieve.
The waste gas recovery system utilizing the flue gas to separate the carbon dioxide and the nitrogen comprises a first cooler, a first gas-liquid separator and a flue gas induced draft fan, wherein an inlet of the first cooler is communicated with an outlet of the purifying device, an outlet of the first cooler is communicated with an inlet of the first gas-liquid separator, an outlet of the first gas-liquid separator is communicated with an inlet of the flue gas induced draft fan, and an outlet of the flue gas induced draft fan is communicated with the carbon and nitrogen separation system.
The exhaust gas recovery system for separating carbon dioxide and nitrogen using flue gas as described above, optionally, the carbon and nitrogen separation system comprises: the carbon and nitrogen separation system comprises a flue gas compressor, a second gas-liquid separator, a first dryer, a first adsorption tower group, a vacuum pump and a first buffer tank, wherein the first adsorption tower group comprises a plurality of first adsorption towers which are arranged in parallel, and a first adsorbent is filled in each first adsorption tower; the inlet of the flue gas compressor is communicated with the pretreatment system, the outlet of the flue gas compressor is communicated with the inlet of the second gas-liquid separator, the outlet of the second gas-liquid separator is communicated with the inlet of the first dryer, the outlet of the first dryer is communicated with the gas inlet of the first adsorption tower group, the top gas outlet of the first adsorption tower group is nitrogen-containing vent gas, the bottom gas outlet of the first adsorption tower group is carbon dioxide gas, the top gas outlet of the first adsorption tower group is communicated with the nitrogen purification system, the bottom gas outlet of the first adsorption tower group is communicated with the inlet of the vacuum pump, the outlet of the vacuum pump is communicated with the inlet of the first buffer tank, and the outlet of the first buffer tank is communicated with the natural gas synthesis system.
The waste gas recovery system for separating carbon dioxide and nitrogen from flue gas as described above, optionally, the nitrogen purification system includes a second buffer tank, a nitrogen compressor, a second dryer, a filter, and a second adsorption tower group, the second adsorption tower group includes a plurality of second adsorption towers arranged in parallel, and the second adsorption towers are filled with a second adsorbent;
the inlet of the second buffer tank is connected with the carbon-nitrogen separation system, the outlet of the second buffer tank is communicated with the inlet of the nitrogen compressor, the outlet of the nitrogen compressor is communicated with the inlet of the second dryer, the outlet of the second dryer is communicated with the inlet of the filter, the outlet of the filter is communicated with the air inlet of the second adsorption tower set, and the top air outlet of the second adsorption tower set obtains purified nitrogen.
The waste gas recovery system for separating carbon dioxide and nitrogen by using flue gas as described above optionally further comprises a synthetic ammonia system connected with the nitrogen purification system for using nitrogen produced by the nitrogen purification system as a raw material of synthetic ammonia.
Has the advantages that:
(1) the waste gas recovery system for separating carbon dioxide and nitrogen by using flue gas can recover carbon dioxide and nitrogen to the maximum extent, and no three wastes are generated. Moreover, carbon dioxide separated from the flue gas can be used as a raw material for preparing liquefied natural gas and is converted into methane, so that the recovery rate of the flue gas is improved, the emission of carbon dioxide gas is reduced, the production cost of the liquefied natural gas is reduced, and the liquefied natural gas is energy-saving and environment-friendly.
(2) The desorption gas in the carbon and nitrogen separation system is desorbed by a vacuum pump, so that the energy consumption is reduced, and the recovery rate of carbon dioxide is improved.
(3) The nitrogen separated by the carbon and nitrogen separation system can be used as a raw material of synthetic ammonia after purification, so that the recovery rate of flue gas is further improved, the emission of nitrogen is reduced, the production cost of synthetic ammonia is relatively reduced, and the system is energy-saving and environment-friendly.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. Wherein:
FIG. 1 is a schematic flow diagram of an exhaust gas recovery system for separating carbon dioxide and nitrogen from flue gas in accordance with an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a pre-processing system according to an embodiment of the present invention;
FIG. 3 is a schematic flow diagram of a carbon-nitrogen separation system according to an embodiment of the present invention;
FIG. 4 is a schematic flow diagram of a natural gas synthesis system according to an embodiment of the utility model;
FIG. 5 is a schematic flow diagram of a nitrogen purification system according to an embodiment of the present invention.
Reference numerals:
1-a purification device; 2-a pretreatment system; 3-a carbon nitrogen separation system; 4-a natural gas synthesis system; 5-nitrogen purification system; 6-synthetic ammonia system;
21-a first cooler; 22-a first gas-liquid separator; 23-a smoke induced draft fan;
31-a flue gas compressor; 32-a second gas-liquid separator; 33-a first dryer; 34-a first adsorption tower group; 35-a vacuum pump; 36-a first buffer tank;
41-mixed gas holder; 42-mixed gas compressor; 43-a desulfurization purification tower; 44-a methane synthesis reactor; 45-drying and purifying device; 46-a liquefaction separation unit; 47-liquefied natural gas storage tanks;
51-a second buffer tank; 52-nitrogen compressor; 53-a second dryer; 54-a filter; 55-the second adsorption column group.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Aiming at the problems in the prior art, the utility model provides a waste gas recovery system for separating carbon dioxide and nitrogen from flue gas. As shown in fig. 1, the exhaust gas recovery system for separating carbon dioxide and nitrogen from flue gas according to the present invention includes a purification apparatus 1, a pretreatment system 2, a carbon-nitrogen separation system 3, a nitrogen purification system 5, and a natural gas synthesis system 4.
Wherein, the purifying device 1 is used for purifying flue gas generated by a coke oven; the pretreatment system 2 is connected with the purification device 1 and is used for dehydrating and cooling the purified flue gas; the carbon-nitrogen separation system 3 is connected with the pretreatment system 2 and is used for pressure swing adsorption of the pretreated flue gas and separation of nitrogen-containing vent gas and crude carbon dioxide gas; the nitrogen purification system 5 is connected with the carbon and nitrogen separation system 3 and is used for purifying the nitrogen-containing vent gas separated by the carbon and nitrogen separation system 3; the natural gas synthesis system 4 is connected with the carbon-nitrogen separation system 3 and connected with a hydrogen-rich gas source and is used for preparing natural gas by adopting the crude carbon dioxide gas and the hydrogen-rich gas separated by the carbon-nitrogen separation system 3.
It should be noted that the purification apparatus 1 is generally a filtering apparatus for purifying flue gas to remove particulate matter from the flue gas.
It can be understood that, the waste gas recovery system of the present invention firstly adopts the purification device 1 to purify the flue gas to remove the particulate matters therein, then adopts the pretreatment system 2 to dehydrate and cool the purified flue gas, then separates the nitrogen-containing vent gas and the crude carbon dioxide gas from the pretreated flue gas through the carbon-nitrogen separation system 3 after pressure swing adsorption, and uses the separated crude carbon dioxide gas to prepare the liquefied natural gas, so that the recovery utilization rate of the flue gas can be improved, and the production cost of the liquefied natural gas can be reduced.
As shown in fig. 2, in an alternative embodiment of the present invention, the pretreatment system 2 includes a first cooler 21, a first gas-liquid separator 22 and a flue gas induced draft fan 23, an inlet of the first cooler 21 is communicated with an outlet of the purification apparatus 1, an outlet of the first cooler 21 is communicated with an inlet of the first gas-liquid separator 22, an outlet of the first gas-liquid separator 22 is communicated with an inlet of the flue gas induced draft fan 23, and an outlet of the flue gas induced draft fan 23 is communicated with the carbon-nitrogen separation system 3.
As shown in fig. 3, in an alternative embodiment of the present invention, the carbon-nitrogen separation system 3 includes a flue gas compressor 31, a second gas-liquid separator 32, a first dryer 33, a first adsorption tower group 34, a vacuum pump 35 and a first buffer tank 36, wherein the first adsorption tower group 34 includes a plurality of first adsorption towers arranged in parallel, and each first adsorption tower is filled with a first adsorbent; the inlet of the flue gas compressor 31 is communicated with the outlet of a flue gas induced draft fan 23 of the pretreatment system 2, the outlet of the flue gas compressor 31 is communicated with the inlet of a second gas-liquid separator 32, the outlet of the second gas-liquid separator 32 is communicated with the inlet of a first dryer 33, the outlet of the first dryer 33 is communicated with the gas inlet of a first adsorption tower set 34, the top gas outlet of the first adsorption tower set 34 is nitrogen-containing vent gas, the bottom gas outlet is carbon dioxide gas, the top gas outlet of the first adsorption tower set 34 is communicated with a nitrogen purification system 5, the bottom gas outlet of the first adsorption tower set 34 is communicated with the inlet of a vacuum pump 35, the outlet of the vacuum pump 35 is communicated with the inlet of a first buffer tank 36, and the outlet of the first buffer tank 36 is communicated with a natural gas synthesis system 4. The first adsorbent is an existing adsorbent.
The nitrogen-containing vent gas of the present invention has a nitrogen content of 88% to 90% by volume (e.g., 88%, 89%, or 90%) and a purity of 45% to 50% by volume (e.g., 45%, 46%, 47%, 48%, 49%, or 50%) of carbon dioxide in the crude carbon dioxide gas.
Furthermore, a solenoid valve is arranged on a pipeline connected with the inlet of the first adsorption tower, a pneumatic valve is arranged on a pipeline connected with the outlet of the flue gas compressor 31, and the solenoid valve and the pneumatic valve are electrically connected with the PLC. The PLC controls the pneumatic valve through the electromagnetic valve to ensure different working states of different first adsorption towers, nitrogen-rich gas is discharged from the tower top and enters the nitrogen purification system 5 as raw material gas, and crude carbon dioxide gas with the gas outlet rate of about 50% is discharged from the tower bottom and serves as raw material gas of the natural gas synthesis system 4.
As shown in fig. 4, in an alternative embodiment of the present invention, the natural gas synthesis system 4 includes a mixed gas tank 41, a mixed gas compressor 42, a methane synthesis reactor 44, a liquefaction separation unit 46, and a liquefied natural gas storage tank 47. Wherein, the gas inlet of the mixed gas holder 41 is connected with the outlet of the first buffer tank 36 in the carbon-nitrogen separation system 3 and connected with the hydrogen-rich gas source for mixing the carbon dioxide gas and the hydrogen-rich gas separated by the carbon-nitrogen separation system 3 to obtain a mixed gas; the inlet of the mixed gas compressor 42 is connected with the outlet of the mixed gas cabinet 41; the inlet of the methane synthesis reactor 44 is connected to the outlet of the mixed gas compressor 42 for reacting the hydrogen in the mixed gas with carbon dioxide to produce methane; an inlet of the liquefaction separation device 46 is connected with an air outlet of the methane synthesis reactor 44, and is used for separating liquefied natural gas and hydrogen-rich gas from the methanated mixed gas; a liquefied natural gas storage tank 47 is connected to the liquefied natural gas outlet of the liquefaction separation unit 46.
The embodiment can convert carbon dioxide separated from the flue gas into methane as a raw material for preparing the liquefied natural gas, improves the recovery utilization rate of the flue gas, reduces the emission of carbon dioxide gas, reduces the production cost of the liquefied natural gas, and is energy-saving and environment-friendly.
In the preferred embodiment of the present invention, the hydrogen-rich gas outlet of the liquefaction separation unit 46 is connected to the gas inlet of the mixed gas tank 41. The hydrogen-rich gas in the liquefaction separation device 46 can be returned to the mixed gas tank 41 for reuse, and the utilization rate of the hydrogen is improved.
Further, a desulfurization purification tower 43 is further arranged between the mixed gas compressor 42 and the methane synthesis reactor 44, an air inlet of the desulfurization purification tower 43 is connected with an air outlet of the mixed gas compressor 42, and an air outlet of the desulfurization purification tower 43 is connected with an air inlet of the methane synthesis reactor 44, and is used for performing desulfurization purification treatment on the mixed gas.
Further, a drying and purifying device 45 is further arranged between the methane synthesis reactor 44 and the liquefaction separation device 46, an air inlet of the drying and purifying device 45 is connected with an air outlet of the methane synthesis reactor 44, and an air outlet of the drying and purifying device 45 is connected with an air inlet of the liquefaction separation device 46, and is used for drying and purifying the methanated mixed gas.
Alternatively, the drying and purifying device 45 is a drying tower filled with molecular sieves. Wherein the molecular sieve can be selected from a 4A molecular sieve or a 13X molecular sieve, has strong moisture absorption capacity, and can effectively dry and purify the methanated mixed gas.
As shown in fig. 5, the nitrogen purification system 5 includes a second buffer tank 51, a nitrogen compressor 52, a second dryer 53, a filter 54, and a second adsorption tower group 55, and the second adsorption tower group 55 includes a plurality of second adsorption towers arranged in parallel, and the second adsorption towers are filled with a second adsorbent. Wherein, the inlet of the second buffer tank 51 is connected with the carbon-nitrogen separation system 3, the outlet of the second buffer tank 51 is communicated with the inlet of the nitrogen compressor 52, the outlet of the nitrogen compressor 52 is communicated with the inlet of the second dryer 53, the outlet of the second dryer 53 is communicated with the inlet of the filter 54, the outlet of the filter 54 is communicated with the air inlet of the second adsorption tower group 55, and the outlet at the top of the second adsorption tower group 55 obtains purified nitrogen.
It should be noted that the volume purity of the purified nitrogen is 99% to 99.999%.
As shown in fig. 1, the system of the present invention further comprises a synthetic ammonia system 6, wherein the synthetic ammonia system 6 is connected to the nitrogen purification system 4, and is used for taking the nitrogen produced by the nitrogen purification system 4 as a raw material of synthetic ammonia.
The nitrogen separated by the carbon and nitrogen separation system 3 can be used as a raw material of synthetic ammonia after purification, so that the recovery rate of flue gas is further improved, the emission of nitrogen is reduced, the production cost of synthetic ammonia is relatively reduced, and the method is energy-saving and environment-friendly.
It should be noted that the ammonia synthesis system 6 is a conventional ammonia synthesis system, and is not described herein again and falls within the scope of the present invention.
In order to ensure the smoothness and safety of the whole waste gas recovery system for separating carbon dioxide and nitrogen from flue gas, a control valve is arranged on each pipeline in the system, so that system accidents caused by faults of individual equipment are avoided, and the gas flow rate of each pipeline can be adjusted according to production requirements.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An exhaust gas recovery system for separating carbon dioxide and nitrogen using flue gas, the system comprising:
a purification device for purifying flue gas generated by the coke oven;
the pretreatment system is connected with the purification device and is used for dehydrating and cooling the purified flue gas;
the carbon and nitrogen separation system is connected with the pretreatment system and is used for pressure swing adsorption of the pretreated flue gas and separation of nitrogen-containing vent gas and crude carbon dioxide gas;
the nitrogen purification system is connected with the carbon and nitrogen separation system and is used for purifying the nitrogen-containing vent gas separated by the carbon and nitrogen separation system;
and the natural gas synthesis system is connected with the carbon and nitrogen separation system, is connected with a hydrogen-rich gas source, and is used for preparing natural gas by adopting the crude carbon dioxide gas and the hydrogen-rich gas separated by the carbon and nitrogen separation system.
2. The flue gas recovery system for separating carbon dioxide and nitrogen using a flue gas of claim 1, wherein the natural gas synthesis system comprises:
the gas inlet of the mixed gas holder is connected with the carbon-nitrogen separation system and the hydrogen-rich gas source and is used for mixing the carbon dioxide gas and the hydrogen-rich gas separated by the carbon-nitrogen separation system to obtain a mixed gas;
the inlet of the mixed gas compressor is connected with the outlet of the mixed gas tank;
the gas inlet of the methane synthesis reactor is connected with the outlet of the mixed gas compressor and is used for enabling hydrogen in the mixed gas to react with carbon dioxide to produce methane;
the inlet of the liquefaction separation device is connected with the gas outlet of the methane synthesis reactor and is used for separating liquefied natural gas and hydrogen-rich gas from the methanated mixed gas;
and the liquefied natural gas storage tank is connected with the liquefied natural gas outlet of the liquefaction separation device.
3. An exhaust gas recovery system for separating carbon dioxide and nitrogen using a flue gas as claimed in claim 2, wherein the hydrogen-rich gas outlet of the liquefaction separation unit is connected to the gas inlet of the mixed gas holder.
4. The exhaust gas recovery system for separating carbon dioxide and nitrogen gas using flue gas as claimed in claim 2, wherein a desulfurization purification tower is further disposed between the mixed gas compressor and the methane synthesis reactor, an air inlet of the desulfurization purification tower is connected to an air outlet of the mixed gas compressor, and an air outlet of the desulfurization purification tower is connected to an air inlet of the methane synthesis reactor, for performing desulfurization purification treatment on the mixed gas.
5. The exhaust gas recovery system for separating carbon dioxide and nitrogen gas by using flue gas as claimed in claim 2, wherein a drying and purifying device is further disposed between the methane synthesis reactor and the liquefaction separation device, an air inlet of the drying and purifying device is connected to an air outlet of the methane synthesis reactor, and an air outlet of the drying and purifying device is connected to an air inlet of the liquefaction separation device, for performing drying and purifying treatment on the methanated mixed gas.
6. The exhaust gas recovery system for separating carbon dioxide and nitrogen using a flue gas according to claim 5, wherein the drying and purifying means is a drying tower filled with a molecular sieve.
7. The exhaust gas recovery system for separating carbon dioxide and nitrogen from flue gas as claimed in claim 1, wherein the pretreatment system comprises a first cooler, a first gas-liquid separator and a flue gas induced draft fan, an inlet of the first cooler is communicated with an outlet of the purification device, an outlet of the first cooler is communicated with an inlet of the first gas-liquid separator, an outlet of the first gas-liquid separator is communicated with an inlet of the flue gas induced draft fan, and an outlet of the flue gas induced draft fan is communicated with the carbon-nitrogen separation system.
8. The exhaust gas recovery system for separating carbon dioxide and nitrogen using a flue gas according to claim 1, wherein the carbon-nitrogen separation system comprises: the carbon and nitrogen separation system comprises a flue gas compressor, a second gas-liquid separator, a first dryer, a first adsorption tower group, a vacuum pump and a first buffer tank, wherein the first adsorption tower group comprises a plurality of first adsorption towers which are arranged in parallel, and a first adsorbent is filled in each first adsorption tower;
the inlet of the flue gas compressor is communicated with the pretreatment system, the outlet of the flue gas compressor is communicated with the inlet of the second gas-liquid separator, the outlet of the second gas-liquid separator is communicated with the inlet of the first dryer, the outlet of the first dryer is communicated with the gas inlet of the first adsorption tower group, the top gas outlet of the first adsorption tower group is nitrogen-containing vent gas, the bottom gas outlet of the first adsorption tower group is carbon dioxide gas, the top gas outlet of the first adsorption tower group is communicated with the nitrogen purification system, the bottom gas outlet of the first adsorption tower group is communicated with the inlet of the vacuum pump, the outlet of the vacuum pump is communicated with the inlet of the first buffer tank, and the outlet of the first buffer tank is communicated with the natural gas synthesis system.
9. The exhaust gas recovery system for separating carbon dioxide and nitrogen from a flue gas according to claim 1, wherein the nitrogen purification system comprises a second buffer tank, a nitrogen compressor, a second dryer, a filter, and a second adsorption tower group, the second adsorption tower group comprises a plurality of second adsorption towers arranged in parallel, and a second adsorbent is filled in the second adsorption towers;
the inlet of the second buffer tank is connected with the carbon-nitrogen separation system, the outlet of the second buffer tank is communicated with the inlet of the nitrogen compressor, the outlet of the nitrogen compressor is communicated with the inlet of the second dryer, the outlet of the second dryer is communicated with the inlet of the filter, the outlet of the filter is communicated with the air inlet of the second adsorption tower set, and the top air outlet of the second adsorption tower set obtains purified nitrogen.
10. The flue gas recovery system for separating carbon dioxide and nitrogen from flue gas as claimed in any one of claims 1 to 9, further comprising a synthetic ammonia system connected to the nitrogen purification system for using nitrogen produced by the nitrogen purification system as a raw material for synthetic ammonia.
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| WO2023066105A1 (en) * | 2021-10-19 | 2023-04-27 | 大连理工大学 | System and method for synchronously recovering nitrogen and carbon dioxide from boiler flue gas |
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| WO2023066105A1 (en) * | 2021-10-19 | 2023-04-27 | 大连理工大学 | System and method for synchronously recovering nitrogen and carbon dioxide from boiler flue gas |
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