CN218653716U - Trapping and separating system for medium-low concentration carbon dioxide - Google Patents
Trapping and separating system for medium-low concentration carbon dioxide Download PDFInfo
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- CN218653716U CN218653716U CN202222954018.8U CN202222954018U CN218653716U CN 218653716 U CN218653716 U CN 218653716U CN 202222954018 U CN202222954018 U CN 202222954018U CN 218653716 U CN218653716 U CN 218653716U
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Abstract
The utility model provides a capture and separation system for medium and low concentration carbon dioxide. The collecting and separating system comprises a raw material gas compression system, a carbon dioxide collecting system and a carbon dioxide desorbing system, wherein the raw material gas compression system is used for carrying out pressure raising treatment on raw material gas containing medium-low concentration carbon dioxide, and the volume concentration of the carbon dioxide in the raw material gas is 8-80%; the carbon dioxide capture system comprises a plurality of adsorption towers which are arranged in parallel, carbon dioxide adsorbents are filled in the adsorption towers, inlets of the adsorption towers are communicated with outlets of the feed gas compression system through pipelines, and gas outlets at the tops of the adsorption towers are communicated with a downstream system through pipelines; the inlet of the carbon dioxide desorption system is communicated with the air outlet at the bottom of the adsorption tower through a pipeline. Adopt the utility model discloses a entrapment piece-rate system retrieves carbon dioxide to the feed gas that contains middle-low concentration carbon dioxide, can low energy consumption, no three wastes produce and maximum recovery carbon dioxide.
Description
Technical Field
The utility model belongs to the technical field of the recovery of carbon dioxide, concretely relates to entrapment piece-rate system of well low concentration carbon dioxide.
Background
The flue gas of various steam boilers, the kiln tail gas and the tail gas of a carbon dioxide physical absorption method contain carbon dioxide with a certain concentration, the volume concentration is different from 8-80%, the carbon dioxide with the concentration belongs to medium-low concentration, the carbon dioxide cannot be directly refined and recovered, and the carbon dioxide can be refined and purified after being trapped, separated and concentrated.
At present, the conventional methods for capturing carbon dioxide conventionally comprise a chemical absorption method, a physical adsorption method, a membrane separation method and a physical absorption method, while the chemical absorption method and the physical adsorption method are more mature in the market, wherein the chemical absorption method needs steam, absorption liquid needs to be supplemented periodically, and waste residues are generated; the physical adsorption method, namely the PSA method, has high automation degree and no three wastes, and can trap the carbon dioxide with medium and low concentration, so that the energy consumption is lower compared with the chemical absorption method.
Therefore, it is necessary to provide a system for capturing and separating carbon dioxide with a medium or low concentration based on a physical adsorption method.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a entrapment piece-rate system of well low concentration carbon dioxide to can low energy consumption, no three wastes produce and maximum recovery carbon dioxide.
In order to achieve the above object, the present invention provides the following technical solutions:
a capture and separation system for mid-to-low concentrations of carbon dioxide, the capture and separation system comprising:
the feed gas compression system is used for carrying out pressure increasing treatment on feed gas containing medium-low concentration carbon dioxide, wherein the volume concentration of the carbon dioxide in the feed gas is 8-80%;
the carbon dioxide capturing system comprises a plurality of adsorption towers which are arranged in parallel, carbon dioxide adsorbents are filled in the adsorption towers, inlets of the adsorption towers are communicated with outlets of the raw material gas compression system through pipelines, and gas outlets at the tops of the adsorption towers are communicated with a downstream system through pipelines;
and an inlet of the carbon dioxide desorption system is communicated with a gas outlet at the bottom of the adsorption tower through a pipeline. Optionally, the raw material gas compression system comprises a pressure raising device and a gas-liquid separator, an inlet of the pressure raising device is communicated with a raw material gas source containing the carbon dioxide with the medium-low concentration through a pipeline, an outlet of the pressure raising device is communicated with an inlet of the gas-liquid separator through a pipeline, and an outlet of the gas-liquid separator is communicated with an inlet of the adsorption tower through a pipeline.
Optionally, a control valve and a temperature sensor are arranged on an outlet pipeline of the pressure raising equipment; and the gas-liquid separator is provided with a liquid level meter.
Optionally, the pressure raising device is one of a centrifugal compressor, a blower, a screw compressor; and a defoaming device is arranged in the gas-liquid separator.
Optionally, the raw material gas containing the carbon dioxide with medium and low concentration is kiln tail gas, and the volume concentration of the carbon dioxide in the kiln tail gas is 20-70%; the feed gas compression system further comprises a cooler located between the pressure raising device and the gas-liquid separator.
Optionally, a control valve, a carbon dioxide analyzer and a flow meter are arranged on an inlet pipeline of the adsorption tower; a pressure gauge and a pressure sensor are arranged on a gas outlet pipeline at the top of the adsorption tower; and a pressure gauge and a sampling point are arranged on a gas outlet pipeline at the bottom of the adsorption tower.
Optionally, the inlet pipeline of the adsorption tower and the top air outlet of the adsorption tower are both communicated with outside air through a vent pipeline, wherein a control valve and a vent valve are arranged on the vent pipeline communicated with the inlet pipeline of the adsorption tower.
Optionally, a control valve, a flow meter, a temperature sensor, a sampling point, a pressure gauge and a carbon dioxide analyzer are arranged on a pipeline communicated with the downstream system.
Optionally, the carbon dioxide desorption system comprises a vacuum pump and a buffer tank, an inlet of the vacuum pump is communicated with a bottom air outlet of the adsorption tower through a pipeline, and an outlet of the vacuum pump is communicated with an inlet of the buffer tank through a pipeline.
Optionally, a flow meter and a carbon dioxide analyzer are arranged on the outlet pipeline of the buffer tank.
Has the advantages that:
the utility model provides a capture and separation system for medium and low concentration carbon dioxide, which comprises a feed gas compression system, a carbon dioxide capture system and a carbon dioxide desorption system, wherein the feed gas compression system is used for carrying out pressure-increasing treatment on feed gas containing medium and low concentration carbon dioxide; the carbon dioxide capture system comprises a plurality of adsorption towers which are arranged in parallel, carbon dioxide adsorbents are filled in the adsorption towers and used for adsorbing carbon dioxide, inlets of the adsorption towers are communicated with outlets of the feed gas compression system through pipelines, and gas outlets at the tops of the adsorption towers are communicated with a downstream system through pipelines and used for recovering other components in the feed gas; the inlet of the carbon dioxide desorption system is communicated with the gas outlet at the bottom of the adsorption tower through a pipeline. Adopt the utility model discloses a entrapment piece-rate system retrieves carbon dioxide to the feed gas that contains middle-low concentration carbon dioxide, can low energy consumption, no three wastes produce and maximum recovery carbon dioxide.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to constitute a limitation on the invention. Wherein:
FIG. 1 is a schematic view of a low-and medium-concentration carbon dioxide capture and separation system according to the present invention;
fig. 2 is a schematic partial flow diagram of an embodiment of the system for capturing and separating low-concentration carbon dioxide according to the present invention.
Reference numbers in the figures: 100-a feed gas compression system; 200-a carbon dioxide capture system; 300-a carbon dioxide desorption system; 1-a gas-liquid separator; 11-a liquid level meter; 2-an adsorption column; 3-a temperature sensor; 4-carbon dioxide analyzer; 5-a flow meter; 6-pressure gauge; 7-a pressure sensor; 8-sampling point; 9-emptying a pipeline; 91-an emptying valve; 10-automatic control valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The utility model provides a capture and separation system of middle and low concentration carbon dioxide to can low energy consumption, no three wastes produce and the maximum recovery carbon dioxide, wherein, middle and low concentration carbon dioxide means that the volume concentration of carbon dioxide is 8-80% (for example 8%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and the interval value between arbitrary two endpoint value).
As shown in fig. 1 and fig. 2, the present invention provides a capture and separation system for middle-low concentration carbon dioxide, which comprises a raw material gas compression system 100, a carbon dioxide capture system 200 and a carbon dioxide desorption system 300, wherein the raw material gas compression system 100 is used for pressure-increasing treatment of raw material gas containing middle-low concentration carbon dioxide; the carbon dioxide capture system 200 comprises a plurality of adsorption towers 2 arranged in parallel, a carbon dioxide adsorbent is filled in the adsorption towers 2, the carbon dioxide adsorbent is an existing adsorbent, specific components of the existing adsorbent are not limited, and is used for adsorbing carbon dioxide, an inlet of the adsorption tower 2 is communicated with an outlet of the feed gas compression system 100 through a pipeline, and a gas outlet at the top of the adsorption tower 2 is communicated with a downstream system through a pipeline and is used for recovering other components in the feed gas; the inlet of the carbon dioxide desorption system 300 is communicated with the air outlet at the bottom of the adsorption tower 2 through a pipeline.
Adopt the utility model discloses a when entrapment piece-rate system retrieves carbon dioxide to the feed gas that contains middle low concentration carbon dioxide, the feed gas that contains middle low concentration carbon dioxide at first gets into in the feed gas compression system 100, feed gas compression system 100 carries out the pressure treatment to the feed gas, later get into in the carbon dioxide entrapment system 200, also get into adsorption tower 2 in proper order, carbon dioxide in the feed gas is adsorbed by the carbon dioxide adsorbent in the adsorption tower 2, and other components in the feed gas are flowed by the top of the tower gas outlet of adsorption tower 2, follow-up entering low reaches system, in order to retrieve other components in the feed gas. Thus, the method has the advantages of low energy consumption, no generation of three wastes and maximum recovery of carbon dioxide.
It should be noted that, when the capture and separation system of the present invention is used to recover carbon dioxide from a raw material gas containing carbon dioxide with a medium or low concentration, the adsorption pressure of the adsorption tower 2 is set to 0.1-2.5MPa (e.g., 0.1MPa, 0.5MPa, 1.0MPa, 1.5MPa, 2.0MPa, 2.5MPa, and the interval value between any two end values), and the adsorption pressure is relatively low. In specific operation, different pressures in the pressure range can be selected according to the concentration of the carbon dioxide in the feed gas, so that the carbon dioxide can be captured and separated by pressure swing adsorption.
Certainly, adopt the utility model discloses a when entrapment piece-rate system retrieves carbon dioxide to the feed gas that contains middle low concentration carbon dioxide, can select the quantity of adsorption tower 2 and the control valve quantity on the corresponding pipeline according to the concentration of carbon dioxide in the feed gas to furthest reduces investment cost.
Optionally, the carbon dioxide desorption system 300 may adopt natural desorption or vacuum pump desorption, and the specific selection may fully consider the recovery rate and energy consumption of carbon dioxide according to the condition of the raw material gas.
The embodiment of the utility model provides an in, feed gas compression system 100 is including carrying pressure equipment and vapour and liquid separator 1, carries the import of pressure equipment to pass through the pipeline and feed gas source intercommunication that contains middle low concentration carbon dioxide, carry the export of pressure equipment pass through the pipeline with vapour and liquid separator 1's import intercommunication, vapour and liquid separator 1's export passes through the pipeline and communicates with the entry of adsorption tower 2. Wherein, the pressure increasing device is used for increasing the pressure of the raw material gas, and the gas-liquid separator 1 is used for removing the moisture of the raw material gas
Optionally, the pressure raising device is one of a centrifugal compressor, a blower and a screw compressor, and is used for raising the pressure of the feed gas containing the carbon dioxide with medium and low concentration.
Alternatively, the gas-liquid separator 1 incorporates a defoaming device for defoaming the raw gas to facilitate subsequent adsorption. It should be noted that, the specific structural arrangement of the defoaming device is not limited, and the structure of the existing defoaming device may be referred to as long as the above function is achieved.
Further, be provided with control valve and temperature sensor 3 on the outlet pipeline of pressure equipment, temperature sensor 3 is used for detecting the temperature of carrying out the pressure back feed gas, if the temperature that detects is higher, can carry out cooling treatment to it.
Further, the gas-liquid separator 1 is provided with a liquid level meter 11 for detecting the liquid level of the gas-liquid separator 1, so as to ensure the smooth operation of the gas-liquid separation process in the feed gas.
In the embodiment of the present invention, the raw material gas containing middle and low concentration carbon dioxide is kiln tail gas, and the volume concentration of carbon dioxide in the kiln tail gas is 20-70% (for example, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% and the interval value between any two end values).
Because the temperature of the kiln tail gas is relatively high, the feed gas compression system 100 further comprises a cooler, and the cooler is located between the pressure increasing device and the gas-liquid separator 1 and used for reducing the temperature of the kiln tail gas after pressure increasing, and generally reducing the temperature of the kiln tail gas to below 40 ℃.
In the embodiment of the utility model, the inlet pipeline of the adsorption tower 2 is provided with a control valve, a carbon dioxide analyzer 4 and a flowmeter 5, wherein the control valve is an automatic control valve 10 and is connected with a controller to realize automatic control operation; carbon dioxide analyzer 4 is arranged in detecting the concentration of carbon dioxide in the feed gas before entering adsorption tower 2, and flowmeter 5 is used for detecting the feed gas flow that enters adsorption tower 2.
Be provided with manometer 6 and pressure sensor 7 on the top gas outlet pipeline of adsorption tower 2, manometer 6 is used for detecting the pressure of other components of raw materials gas absorption back, and pressure sensor 7 is used for changing the pressure registration that manometer 6 detected into the signal of telecommunication to supply follow-up instruction and process control.
Further, be provided with manometer 6 and sampling point 8 on the bottom gas outlet pipeline of adsorption tower 2, manometer 6 is used for detecting the pressure of the carbon dioxide gas after the absorption, and sampling point 8 is used for supplying on-the-spot sample demand.
As shown in FIG. 2, the inlet pipeline of the adsorption tower 2 and the top air outlet of the adsorption tower 2 are both communicated with the outside air through a vent pipeline 9, wherein the vent pipeline 9 communicated with the inlet pipeline of the adsorption tower 2 is provided with a control valve and a vent valve 9. And when detecting that other components of the raw gas before entering the adsorption tower 2 and the raw gas after adsorption are unqualified, opening the vent valve 9 and venting the raw gas.
As shown in fig. 2, a control valve, a flow meter 5, a temperature sensor 3, a sampling point 8, a pressure gauge 6 and a carbon dioxide analyzer 4 are provided on a pipe communicating with a downstream system. Wherein, flowmeter 5, temperature sensor 3, manometer 6 and carbon dioxide analysis appearance 4 are used for detecting the flow, temperature, the pressure of other components of the feed gas after the absorption and carbon dioxide concentration wherein respectively, and sampling point 8 is used for supplying the on-the-spot demand of sampling.
It should be noted that the carbon dioxide recovery can be determined by reading the carbon dioxide analyzer 4 on a line communicating with the downstream system.
The embodiment of the utility model provides an in, carbon dioxide desorption system 300 includes vacuum pump and buffer tank, and the import of vacuum pump passes through the pipeline and communicates in the bottom gas outlet of adsorption tower 2, and the import intercommunication of pipeline and buffer tank is passed through in the export of vacuum pump. In the embodiment, the desorption is carried out in a vacuum pump mode, so that the energy consumption can be effectively reduced, and the recovery rate of carbon dioxide can be improved.
Further, a flow meter 5 and a carbon dioxide analyzer 4 are arranged on an outlet pipeline of the buffer tank, the flow meter 5 is used for detecting the flow rate of the buffer tank, and the carbon dioxide analyzer 4 is used for detecting the concentration of carbon dioxide for subsequent systems. It should be noted that the outlet pipeline of the buffer tank is communicated with a subsequent carbon dioxide system, such as a system for making dry ice.
The system for capturing and separating the medium-concentration and low-concentration carbon dioxide will be described in detail with reference to specific examples.
As shown in fig. 2, the present embodiment is used for capturing and recovering 35% of carbon dioxide in kiln off-gas, wherein the specific components of the kiln off-gas are shown in table 1.
TABLE 1 composition of kiln off-gas
| Composition (I) | Carbon dioxide | Nitrogen gas | Oxygen gas | Argon gas | Water (I) | Temperature of |
| Measured value | 35.1％ | 7.7％ | 3.7％ | 0.1％ | 53.5％ | 150℃ |
The specific operation is as follows: the tail gas of the kiln firstly enters a compressor, the pressure is increased to 0.3MPa, then the tail gas enters a cooler for cooling, the temperature is reduced to below 40 ℃, and then the tail gas enters a gas-liquid separator 1 for gas-liquid separation so as to remove the moisture in the tail gas. The kiln tail gas after pressure increase, temperature reduction and water removal enters an adsorption tower 2 group for adsorption separation, the adsorption tower 2 group comprises 6 adsorption towers 2 which are arranged in parallel, the kiln tail gas preferentially enters a first adsorption tower 2, carbon dioxide is adsorbed in an adsorbent in the adsorption tower 2, vent gas flows out from the top of the tower, and the other 5 adsorption towers 2 are in pressure equalizing, final rising and vacuumizing desorption stages; after the first adsorption tower 2 is saturated in adsorption, kiln tail gas enters the next adsorption tower 2 which just finishes final rise to be adsorbed, the first adsorption tower 2 enters a pressure equalizing stage, and the steps are repeated in this way, after adsorption, pressure equalizing, blowing and stamping of the 6 adsorption towers 2, carbon dioxide is enriched in the adsorbent in each adsorption tower 2, and then desorbed gas obtained after the tower bottom is desorbed by a vacuum pump and cooled is carbon dioxide gas with the volume content of 92% of carbon dioxide and the pressure of 15 KPa.
It should be noted that, in this embodiment, the adsorption pressure of each adsorption tower 2 is 0.3MPa, and the adsorption tower is low-pressure adsorption, and the desorption system adopts a vacuum pump for desorption, which not only reduces energy consumption, but also improves the recovery rate of carbon dioxide.
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. A capture and separation system for middle and low concentration carbon dioxide, characterized in that the capture and separation system comprises:
the feed gas compression system is used for carrying out pressure increasing treatment on feed gas containing medium-low concentration carbon dioxide, wherein the volume concentration of the carbon dioxide in the feed gas is 8-80%;
the carbon dioxide capturing system comprises a plurality of adsorption towers which are arranged in parallel, carbon dioxide adsorbents are filled in the adsorption towers, inlets of the adsorption towers are communicated with outlets of the raw material gas compression system through pipelines, and gas outlets at the tops of the adsorption towers are communicated with a downstream system through pipelines;
and an inlet of the carbon dioxide desorption system is communicated with a gas outlet at the bottom of the adsorption tower through a pipeline.
2. The system for capturing and separating the medium-low carbon dioxide according to claim 1, wherein the feed gas compression system comprises a pressure raising device and a gas-liquid separator, an inlet of the pressure raising device is communicated with a feed gas source containing the medium-low carbon dioxide through a pipeline, an outlet of the pressure raising device is communicated with an inlet of the gas-liquid separator through a pipeline, and an outlet of the gas-liquid separator is communicated with an inlet of the adsorption tower through a pipeline.
3. The capture and separation system for the medium and low concentration carbon dioxide according to claim 2, wherein the outlet pipeline of the pressure raising device is provided with a control valve and a temperature sensor;
and the gas-liquid separator is provided with a liquid level meter.
4. The medium/low carbon dioxide capture and separation system according to claim 2, wherein the pressure raising device is one of a centrifugal compressor, a blower, and a screw compressor;
and a defoaming device is arranged in the gas-liquid separator.
5. The system for capturing and separating carbon dioxide with medium or low concentration as claimed in claim 2, wherein the raw material gas containing carbon dioxide with medium or low concentration is kiln tail gas, and the volume concentration of carbon dioxide in the kiln tail gas is 20-70%;
the feed gas compression system further comprises a cooler located between the pressure raising device and the gas-liquid separator.
6. The system for capturing and separating carbon dioxide with medium and low concentration according to claim 1, wherein the inlet pipeline of the adsorption tower is provided with a control valve, a carbon dioxide analyzer and a flow meter;
a pressure gauge and a pressure sensor are arranged on a gas outlet pipeline at the top of the adsorption tower;
and a pressure gauge and a sampling point are arranged on a gas outlet pipeline at the bottom of the adsorption tower.
7. The system for capturing and separating carbon dioxide with medium and low concentration according to claim 1, wherein the inlet pipeline of the adsorption tower and the top air outlet of the adsorption tower are both communicated with the outside air through a vent pipeline, and a control valve and a vent valve are arranged on the vent pipeline communicated with the inlet pipeline of the adsorption tower.
8. The system for capturing and separating carbon dioxide with middle or low concentration according to claim 1, wherein a control valve, a flow meter, a temperature sensor, a sampling point, a pressure gauge and a carbon dioxide analyzer are provided on the pipeline communicating with the downstream system.
9. The medium/low carbon dioxide capturing and separating system according to any one of claims 1 to 8, wherein the carbon dioxide desorbing system comprises a vacuum pump and a buffer tank, an inlet of the vacuum pump is communicated with the bottom gas outlet of the adsorption tower through a pipeline, and an outlet of the vacuum pump is communicated with an inlet of the buffer tank through a pipeline.
10. The system for capturing and separating carbon dioxide with a medium or low concentration according to claim 9, wherein a flow meter and a carbon dioxide analyzer are provided on the outlet pipe of the buffer tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222954018.8U CN218653716U (en) | 2022-11-07 | 2022-11-07 | Trapping and separating system for medium-low concentration carbon dioxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222954018.8U CN218653716U (en) | 2022-11-07 | 2022-11-07 | Trapping and separating system for medium-low concentration carbon dioxide |
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| CN218653716U true CN218653716U (en) | 2023-03-21 |
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| CN202222954018.8U Active CN218653716U (en) | 2022-11-07 | 2022-11-07 | Trapping and separating system for medium-low concentration carbon dioxide |
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