CN216336618U - Recovery of CO from chemical process2System for preparing nitrogen from waste gas - Google Patents
Recovery of CO from chemical process2System for preparing nitrogen from waste gas Download PDFInfo
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- CN216336618U CN216336618U CN202122521054.0U CN202122521054U CN216336618U CN 216336618 U CN216336618 U CN 216336618U CN 202122521054 U CN202122521054 U CN 202122521054U CN 216336618 U CN216336618 U CN 216336618U
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Abstract
The utility model belongs to the technical field of nitrogen recycling, and particularly relates to a method for recycling CO from a chemical method2And a system for producing nitrogen from the exhaust gas. The system comprises a rough treatment device, a deep purification device and a nitrogen concentration device; the deep purification device comprises a compressor, a deep water removal device and a second filter which are connected in sequence, and a gas inlet of the compressor is connected with a gas outlet of the rough treatment device; the nitrogen concentration device comprises an adsorption tower, and an air inlet of the adsorption tower is connected with an air outlet of the second filter. The system can recover CO from chemical method2The waste gas is treated to prepare nitrogen, and not only the vent gas can be recovered (CO is recovered by a chemical method)2The waste gas after the reaction) and can also recover the pressure of the discharged air, thereby having obvious energy-saving effect.
Description
Technical Field
The utility model belongs to the technical field of nitrogen recycling, and particularly relates to a method for recycling CO from a chemical method2The system and the method for preparing nitrogen from the waste gas.
Background
Nitrogen used in the current factory is obtained by air separation nitrogen preparation, and the nitrogen is obtained by cryogenic cooling and PSA pressure swing adsorption. In either method, the feed gas used was air, and the nitrogen content was 78%.
The capture and recycle of carbon dioxide in flue gas is an important measure for realizing the aim of 'double carbon'. There are two main methods for capturing and industrializing carbon dioxide in flue gas: the chemical absorption method (commonly known as organic amine method) and the physical adsorption method have advantages. The two methods can generate vent waste gas after recovering carbon dioxide, and although the vent gas has different components, the nitrogen content is far higher than 78% of the nitrogen content in the air, wherein the nitrogen content in the vent gas generated by the chemical absorption method is about more than 90%, and the nitrogen content in the vent gas generated by the physical adsorption method is about 85-89%. In the prior art, the vent waste gas is usually directly discharged, and the air is used as the raw material to prepare nitrogen, so that the energy is wasted.
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 method for recovering CO from a chemical method2The system for preparing nitrogen in the waste gas solves the technical problems. The system can recover CO from chemical method2The waste gas is treated to prepare nitrogen, and not only the vent gas can be recovered (CO is recovered by a chemical method)2The waste gas after the reaction) and can also recover the pressure of the discharged air, thereby having obvious energy-saving effect.
The utility model relates to the recovery of CO from a chemical process2The system for preparing nitrogen in waste gas adopts the following technical scheme: recovery of CO from chemical process2The system for preparing nitrogen from waste gas comprises a rough treatment device, a deep purification device and a nitrogen concentration device; the rough treatment device is used for preliminarily removing solvent impurities in the waste gas to obtain preliminary clean gas; the deep purification device comprises a compressor, a deep dewatering device and a second filter which are sequentially connected, wherein a gas inlet of the compressor is connected with a gas outlet of the rough treatment device, and the deep purification device is used for deeply purifying the primary clean gas to obtain deep purified gas; the nitrogen concentration device comprises an adsorption tower, wherein the air inlet of the adsorption tower is connected with the air outlet of the second filter, and the adsorption tower is used for performing pressure swing adsorption on the deeply purified gas to prepare nitrogen.
Preferably, degree of depth water trap includes water diversion tank and desiccator, the air inlet of water diversion tank with the gas outlet of compressor links to each other, the gas outlet of water diversion tank with the air inlet of desiccator links to each other, the gas outlet of desiccator with the air inlet of second filter links to each other.
Preferably, the rough treatment device comprises a demister, a cooler, a gas-liquid separator and a first filter, wherein a gas outlet of the demister is connected with a gas inlet of the cooler, a gas outlet of the cooler is connected with a gas inlet of the gas-liquid separator, a gas outlet of the gas-liquid separator is connected with a gas inlet of the first filter, and a gas outlet of the first filter is connected with a gas inlet of the compressor.
Preferably, the cooler reduces the temperature of the gas to 30-35 ℃.
Preferably, at least two adsorption towers are provided to form an adsorption tower group.
Preferably, a pipeline connected with the gas outlet of the second filter is provided with a PLC controlled pneumatic valve.
Preferably, the adsorption tower is provided with two adsorption towers which are connected in parallel, a gas outlet at the top of the adsorption tower is connected with a finished product nitrogen storage tank through a nitrogen gas outlet pipe, and the nitrogen gas outlet pipe is provided with a PLC controlled pneumatic valve.
Has the advantages that: the chemical method of the utility model for recovering CO2The system for preparing nitrogen in the waste gas can recover CO by a chemical method2The waste gas is treated to prepare nitrogen, and not only the vent gas can be recovered (CO is recovered by a chemical method)2The waste gas after the reaction) and can also recover the pressure of the discharged air, thereby having obvious energy-saving effect.
The chemical method of the utility model for recovering CO2The system for preparing nitrogen from waste gas has high automation degree of the whole equipment and good energy-saving effect, can be widely popularized in industry, and is one of measures for realizing carbon emission reduction.
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 shows the recovery of CO from a chemical process according to an embodiment of the present invention2The structural schematic diagram of a system for producing nitrogen in the exhaust gas of (1);
reference numerals:
100-a rough treatment device; 200-a deep purification device; 300-nitrogen concentration device;
110-a demister; 120-a cooler; 130-gas-liquid separator; 140-a first filter;
210-a compressor; 220-a water separation tank; 230-a dryer; 240-a second filter;
310-adsorption column.
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 problem that the prior art generally uses air as a raw material to prepare nitrogen, and directly empties waste gas with higher nitrogen content and after carbon dioxide is recovered to cause energy waste, the utility model provides a method for recovering CO from a chemical method2And a system for producing nitrogen from the exhaust gas.
As shown in FIG. 1, the present invention provides for the recovery of CO from a chemical process2The system for preparing nitrogen from the waste gas comprises: comprises a rough treatment device 100, a deep purification device 200 and a nitrogen concentration device 300; the rough treatment device 100 is used for preliminarily removing solvent impurities in the waste gas to obtain a preliminary clean gas; the deep purification device 200 comprises a compressor 210, a deep water removal device and a second filter 240 which are connected in sequence, wherein a gas inlet of the compressor 210 is connected with a gas outlet of the rough treatment device 100, and the deep purification device 200 is used for deep purification of the primary clean gas to obtain deep purified gas; the nitrogen concentration device 300 comprises an adsorption tower 310, wherein an air inlet of the adsorption tower 310 is connected with an air outlet of the second filter 240, and the adsorption tower 310 is used for performing pressure swing adsorption on the deep purified gas to prepare nitrogen.
The chemical method of the utility model for recovering CO2The system for preparing nitrogen in the waste gas can recover CO by a chemical method2The waste gas is treated to prepare nitrogen, and not only the vent gas can be recovered (CO is recovered by a chemical method)2The waste gas after the reaction) and can also recover the pressure of the discharged air, thereby having obvious energy-saving effect. Wherein the CO is recovered by a chemical process2The waste gas contains nitrogen, oxygen, carbon dioxide, water and organic amine, wherein the content of the nitrogen is more than 90% (volume percentage), the content of the oxygen is 8-12% (volume percentage), the content of the carbon dioxide is 0.5-2% (volume percentage), and the content of the water is 5-9% (volume percentage).
In the preferred embodiment of the present invention, the deep water removal device comprises a water diversion tank 220 and a dryer 230, wherein an air inlet of the water diversion tank 220 is connected with an air outlet of the compressor 210, an air outlet of the water diversion tank 220 is connected with an air inlet of the dryer 230, and an air outlet of the dryer 230 is connected with an air inlet of the second filter 240. Through adopting compressor 210 to carry out the pressure to preliminary clean gas, later divide water through water knockout drum 220, get into desiccator 230 and carry out secondary drying and purification, the water in the preliminary clean gas of degree of depth desorption can also detach the front end and carry trace sulphide, nitrogen oxide and the organic solvent of coming, further purifies preliminary clean gas. Then, the gas enters a second filter 240 to further remove trace sulfide, nitrogen oxide, water and dust to obtain a deep purified gas (for example, the deep purified gas can reach the following grade: the pressure is 0.7-1.0 MPa, the dust content is less than or equal to 0.01 μm, and the dew point is-20 to-30 ℃).
In a preferred embodiment of the present invention, the crude treatment apparatus 100 includes a demister 110, a cooler 120, a gas-liquid separator 130, and a first filter 140, wherein an air outlet of the demister 110 is connected to an air inlet of the cooler 120, an air outlet of the cooler 120 is connected to an air inlet of the gas-liquid separator 130, an air outlet of the gas-liquid separator 130 is connected to an air inlet of the first filter 140, and an air outlet of the first filter 140 is connected to an air inlet of the compressor 210. By providing the demister 110, CO can be recovered from a chemical process2And carrying out preliminary demisting and intercepting on solvent steam carried by the waste gas, then cooling the solvent steam in a cooler 120, and carrying out coarse dehydration on water vapor carried by the waste gas.
In the preferred embodiment of the present invention, the cooler 120 reduces the temperature of the gas to 30-35 ℃, and the first filter 140 is used to remove any one or a combination of several of sulfide, nitrogen oxide, water and dust.
In the preferred embodiment of the present invention, at least two adsorption towers 310 are provided to form an adsorption tower group.
In a preferred embodiment of the present invention, a PLC controlled pneumatic valve is disposed on a pipeline connecting the adsorption tower set and the outlet of the second filter 230. The deeply purified gas enters different adsorption towers 310 for adsorption separation through a PLC controlled pneumatic valve, the number of the adsorption towers 310 can be two or more, and the finished product nitrogen is collected from the top of the tower and then enters a finished product nitrogen storage tank for lower-level use.
In the preferred embodiment of the present invention, there are two adsorption towers 310, the two adsorption towers 310 are connected in parallel, the outlet of the tower top of the adsorption tower 310 is connected to the finished product nitrogen storage tank through a nitrogen outlet pipe, and the nitrogen outlet pipe is provided with a PLC controlled pneumatic valve.
In a preferred embodiment of the utility model, CO is recovered from a chemical process2The method for preparing nitrogen from the waste gas can be specifically as follows:
the method is adopted to prepare nitrogen from the waste gas (vent gas) after the carbon dioxide is recovered by the chemical method of the flue gas of the coal-fired boiler; the example was vented at about 47 deg.C, 10KPa, 92% nitrogen (volume percent), 10% oxygen (volume percent), 1% carbon dioxide (volume percent), 7% water (volume percent) and trace amounts of organic amine.
Air intake amount 50000Nm3And/h, sequentially entering a demister 110, a cooler 120 (the temperature of the vent gas is reduced to 30-35 ℃), a gas-liquid separator 130 and a filter 140 for treatment so as to remove free water in the vent gas and obtain primary clean gas.
The primary clean gas enters a compressor 210 to be compressed to 0.8MPa, is further dewatered by a water separation tank 220, and then enters a dryer 230 for deep dehydration and drying; then enters a second filter 240 for dust removal, and the dust content in the discharged air is ensured to be less than or equal to 0.01 mu m, and the pressure dew point is-20 ℃, so that the adsorption grade can be reached (namely the deep purified gas is obtained).
The deeply purified gas enters a nitrogen concentration device 300 (an adsorption tower set), and after pressure swing adsorption, the output of the tower top is 0.6MPa, 20000Nm3H, 99.5% purity of finished product nitrogen.
If at 50000Nm3The air is used as raw material gas, the gas production pressure is 0.6MPa and the gas production is 15500Nm under the adsorption pressure of 0.8MPa3H, 99.5% pure nitrogen. Namely, under the same energy consumption, the gas production of the utility model is improved by 29 percent, and the energy-saving effect is obvious.
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 (7)
1. Recovery of CO from chemical process2The system for preparing nitrogen from waste gas is characterized by comprising a rough treatment device, a deep purification device and a nitrogen concentration device;
the rough treatment device is used for preliminarily removing solvent impurities in the waste gas to obtain preliminary clean gas;
the deep purification device comprises a compressor, a deep dewatering device and a second filter which are sequentially connected, wherein a gas inlet of the compressor is connected with a gas outlet of the rough treatment device, and the deep purification device is used for deeply purifying the primary clean gas to obtain deep purified gas;
the nitrogen concentration device comprises an adsorption tower, wherein the air inlet of the adsorption tower is connected with the air outlet of the second filter, and the adsorption tower is used for performing pressure swing adsorption on the deeply purified gas to prepare nitrogen.
2. The recovery of CO from chemical processes of claim 12The waste gas in prepare nitrogen gas's system, its characterized in that, degree of depth water trap includes water diversion tank and desiccator, water diversion tank's air inlet with the gas outlet of compressor links to each other, water diversion tank's gas outlet with the air inlet of desiccator links to each other, the gas outlet of desiccator with the air inlet of second filter links to each other.
3. The recovery of CO from chemical processes of claim 12The system for preparing nitrogen in waste gas is characterized in that the coarse treatment device comprises a demister, a cooler, a gas-liquid separator and a first filter, wherein a gas outlet of the demister is connected with a gas inlet of the cooler, a gas outlet of the cooler is connected with a gas inlet of the gas-liquid separator, a gas outlet of the gas-liquid separator is connected with a gas inlet of the first filter, and a gas outlet of the first filter is connected with a gas inlet of the compressorAnd (4) connecting.
4. The recovery of CO from chemical processes of claim 32The system for preparing nitrogen from waste gas is characterized in that the temperature of the gas is reduced to 30-35 ℃ by the cooler.
5. Recovery of CO from chemical processes according to any of claims 1 to 42The system for preparing nitrogen from waste gas is characterized in that at least two adsorption towers are arranged to form an adsorption tower group.
6. The recovery of CO from chemical processes of claim 52The system for preparing nitrogen in the waste gas is characterized in that a PLC controlled pneumatic valve is arranged on a pipeline connected with the gas outlet of the second filter and the adsorption tower group.
7. The recovery of CO from chemical processes of claim 12The system for preparing nitrogen in waste gas is characterized in that two adsorption towers are arranged and are connected in parallel, a gas outlet at the top of each adsorption tower is connected with a finished product nitrogen storage tank through a nitrogen outlet pipe, and a PLC control pneumatic valve is arranged on the nitrogen outlet pipe.
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| CN202122521054.0U CN216336618U (en) | 2021-10-19 | 2021-10-19 | Recovery of CO from chemical process2System for preparing nitrogen from waste gas |
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| CN202122521054.0U CN216336618U (en) | 2021-10-19 | 2021-10-19 | Recovery of CO from chemical process2System for preparing nitrogen from waste gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113998677A (en) * | 2021-10-19 | 2022-02-01 | 碳和科技(北京)有限公司 | Recovery of CO from chemical process2System and method for producing nitrogen from waste gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113998677A (en) * | 2021-10-19 | 2022-02-01 | 碳和科技(北京)有限公司 | Recovery of CO from chemical process2System and method for producing nitrogen from waste gas |
| CN113998677B (en) * | 2021-10-19 | 2023-10-24 | 碳和科技(北京)有限公司 | CO recovery from chemical process 2 System and method for preparing nitrogen from waste gas of (a) a reactor |
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