Gas treatment system with VOC condensation and CO2 separation functions

Abstract

The utility model relates to the technical field of greenhouse gases, in particular to a gas treatment system with functions of condensing volatile organic compounds (VOC) and separating carbon dioxide (CO2). The VOC gas in the waste gas is condensed into liquid through condensation and pressurized condensation in a two-section separation manner, so that the liquid is separated and recycled, and CO2 is still kept in a gas state due to insufficient pressure, so that the CO2 gas is separated and recycled. The function of separating and recovering VOC and CO2 is realized by utilizing the characteristics that the condensation temperature of the volatile organic compounds is lower and the required pressure is lower, and the liquefaction temperature of the carbon dioxide is higher and the required pressure is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of greenhouse gases, and particularly relates to a gas treatment system with the functions of condensing VOC and separating CO2. Background Art

[0002] The composition of air pollutants is very complex and the sources are very extensive. Transportation, industrial production processes, domestic pollution sources, agricultural activities, and natural pollution sources, etc. will all generate air pollutants and greenhouse gases with different compositions, such as particulate matter (PM), volatile organic compounds (VOC), and carbon dioxide (CO2), etc. Among them, both VOC and CO2 are common pollutants in industrial processes and vehicle exhaust.

[0003] However, for the exhaust gas containing both volatile organic compounds and carbon dioxide, there is currently no device or equipment on the market that can separate VOC and CO2. This is because the condensation temperature of volatile organic compounds is relatively low and the required pressure is relatively low, while the liquefaction temperature of carbon dioxide is relatively high and the required pressure is relatively high.

[0004] Therefore, how to treat volatile organic compounds and carbon dioxide simultaneously is a technical problem that needs to be solved urgently. Summary of the Utility Model

[0005] In order to solve the technical problems mentioned in the background art, the utility model provides a gas treatment system with the functions of condensing VOC and separating CO2, including:

[0006] A primary condensation device, a secondary condensation device, and a recovery device;

[0007] The primary condensation device and the secondary condensation device are both connected to the recovery device through a recovery pipeline; and

[0008] A pressurizing device is further arranged between the primary condensation device and the secondary condensation device; wherein

[0009] The primary condensation device is adapted to perform primary condensation on the waste gas so that the liquefied VOC gas flows to the recovery device through the recovery pipeline; and

[0010] The uncondensed VOC gas and CO2 gas flow into the pressurizing device through corresponding pipelines, and after being pressurized in the pressurizing device, they flow into the secondary condensation device for secondary condensation.

[0011] Further, the primary condensation device includes: a first condensation chamber and a first condenser;

[0012] A first condensation pipe is arranged in the first condensation chamber; and

[0013] The first condenser is connected to the first condensation chamber through a pipeline to transport the refrigerant in the first condenser to the first condensation chamber.

[0014] Furthermore, the first condensation pipe is adapted to provide a gas passage for VOC gas and CO2 gas;

[0015] The lower end of the first condensation pipe is communicated with the recovery device;

[0016] The upper end of the first condensation pipe is communicated with the pressurizing device.

[0017] Furthermore, the secondary condensation device includes: a second condensation chamber and a second condenser;

[0018] A second condensation pipe is arranged in the second condensation chamber; and

[0019] The second condenser is connected to the second condensation chamber through a pipeline to transport the refrigerant in the second condenser to the second condensation chamber.

[0020] Furthermore, the lower end of the second condensation pipe is communicated with the pressurizing device; and

[0021] An interface communicated with the recovery pipeline is further opened at the lower end of the second condensation pipe.

[0022] Furthermore, the gas treatment system further includes: a heat exchange device;

[0023] The heat exchange device is communicated with the secondary condensation device; wherein

[0024] The heat exchange device is adapted to heat the gas flowing out of the secondary condensation device; and

[0025] A gas collection chamber is arranged downstream of the heat exchange device to collect the heated gas.

[0026] Furthermore, the gas treatment system further includes: a pretreatment device;

[0027] The pretreatment device is arranged upstream of the primary condensation device to filter and adsorb water vapor from the gas before it enters the primary condensation device.

[0028] The beneficial effects of the present utility model are as follows. The gas treatment system with the function of condensing VOC and separating CO2 of the present utility model performs two-stage condensation treatment on VOC and CO2 waste gas through the setting of two-stage condensation devices. By using the two-stage separation method, the VOC gas in the waste gas is condensed and pressurized and condensed into a liquid through condensation and pressurized condensation, so as to be separated and recovered. Since the pressure of CO2 is not enough, it still remains in a gaseous state, so as to separate and recover CO2 gas. By utilizing the characteristics that the condensation temperature of volatile organic compounds is relatively low and the required pressure is relatively low, while the liquefaction temperature of carbon dioxide is relatively high and the required pressure is relatively high, the functions of separating and recovering VOC and CO2 are realized.

[0029] Other features and advantages of the present utility model will be described in the following specification. And, in part, it will become obvious from the specification or be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0030] In order to make the above-mentioned objectives, features and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. Brief Description of the Drawings

[0031] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 The structural schematic diagram of the gas treatment system with the function of condensing VOC and separating CO2 involved in some embodiments is shown.

[0033] In the figure:

[0034] Primary condensation device 1, first condensation chamber 10, first condensation pipe 101, first condenser 11, secondary condensation device 2, second condensation chamber 20, second condensation pipe 201, second condenser 21, recovery device 3, recovery pipeline 30, pressurization device 4, pretreatment device 5, heat exchange device 6, gas collection chamber 7. Detailed Embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] As Figure 1 shown, at least one embodiment provides a gas treatment system having the functions of condensing VOC and separating CO2, including: a primary condensation device 1, a secondary condensation device 2, and a recovery device 3;

[0037] The primary condensation device 1 and the secondary condensation device 2 are both connected to the recovery device 3 through a recovery pipeline 30; and a pressurizing device 4 is further provided between the primary condensation device 1 and the secondary condensation device 2; wherein the primary condensation device 1 is adapted to perform primary condensation on the waste gas, so that the liquefied VOC gas flows to the recovery device 3 through the recovery pipeline 30; and the uncondensed VOC gas and CO2 gas flow into the pressurizing device 4 through corresponding pipelines, and after being pressurized in the pressurizing device 4, flow into the secondary condensation device 2 for secondary condensation.

[0038] In some embodiments, by setting two-stage condensation devices and a pressurizing device 4, the VOC gas in the waste gas is condensed and pressurized and condensed into a liquid by a two-stage separation method, so as to be separated and recovered, while CO2 remains in a gaseous state due to insufficient pressure, so as to separate and recover the CO2 gas. By utilizing the characteristics that the condensation temperature of volatile organic compounds is relatively low and the required pressure is relatively low, while the liquefaction temperature of carbon dioxide is relatively high and the required pressure is relatively high, the functions of separating and recovering VOC and CO2 are realized.

[0039] In some embodiments, the primary condensation device 1 includes: a first condensation chamber 10 and a first condenser 11; a first condensation pipe 101 is arranged in the first condensation chamber 10; and the first condenser 11 is connected to the first condensation chamber 10 through a pipeline to convey the refrigerant in the first condenser 11 into the first condensation chamber 10.

[0040] Specifically, the first condensation pipe 101 arranged in the first condensation chamber 10 is used to provide a flow channel for the waste gas. When the waste gas enters the first condensation pipe 101, due to the refrigeration effect of the first condenser 11, most of the VOC gas in the waste gas is liquefied and flows out from the lower end inlet of the first condensation pipe 101 and flows into the recovery pipeline 30 to be collected by the recovery device 3, while the uncondensed VOC gas and the CO2 gas flow from the upper end outlet of the first condensation pipe 101 to the downstream pressurizing device 4.

[0041] Preferably as an embodiment, the temperature of the first condensation chamber 10 is controlled below -30°C, and the refrigerant flows through the corresponding pipelines in the first condensation chamber 10 and the first condenser 11.

[0042] In some embodiments, the upper end of the first condensation pipe 101 is connected to the pressurizing device 4, so that the gas is compressed under the action of the pressurizing device 4.

[0043] In some embodiments, the secondary condensation device 2 includes: a second condensation chamber 20 and a second condenser 21; a second condensation pipe is arranged in the second condensation chamber 20; and the second condenser 21 is connected to the second condensation chamber 20 through a pipeline to transport the refrigerant in the second condenser 21 to the second condensation chamber 20.

[0044] Specifically, the gas pressurized by the pressurizing device 4 enters the second condensation chamber 20 through the second condensation pipe, and thus is further condensed and liquefied under the condensation action of the second condenser 21. Similarly, the temperature of the second condensation chamber 20 is controlled below -30°C. The condensed and liquefied VOC gas flows into the recovery device 3 from the recovery pipeline 30.

[0045] In some embodiments, the gas treatment system further includes: a heat exchange device 6; the heat exchange device 6 is connected to the secondary condensation device 2; wherein the heat exchange device 6 is adapted to heat the gas flowing out of the secondary condensation device 2; and a gas collection chamber 7 is arranged downstream of the heat exchange device 6 to collect the heated gas.

[0046] Specifically, the heat exchange device 6 is used to heat the gas flowing out of the secondary condensation device 2, so as to collect carbon dioxide into the gas collection chamber 7.

[0047] In some embodiments, the gas treatment system further includes: a pretreatment device 5; the pretreatment device 5 is arranged upstream of the primary condensation device 1 to filter and adsorb water vapor from the gas before it enters the primary condensation device 1.

[0048] In summary, the gas treatment system of the present utility model with the functions of condensing VOC and separating CO2 sets two-stage condensation devices to perform two-stage condensation treatment on VOC and CO2 waste gases. By using the two-stage separation method, the VOC gas in the waste gas is condensed and pressurized and condensed into a liquid through condensation, so as to be separated and recovered, while CO2 remains in a gaseous state due to insufficient pressure, so as to separate and recover CO2 gas. By utilizing the characteristics that the condensation temperature of volatile organic compounds is relatively low and the required pressure is relatively low, while the liquefaction temperature of carbon dioxide is relatively high and the required pressure is relatively high, the functions of separating and recovering VOC and CO2 are realized.

[0049] In the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Based on the above inspiration from the ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gas treatment system with the function of condensing VOC and separating CO2, characterized in that: include: Primary and secondary condensing units and recovery units; The primary condensing device and the secondary condensing device are both connected to the recovery device through a recovery pipeline; and A pressurizing device is also provided between the primary condensing device and the secondary condensing device; The primary condensation device is suitable for performing primary condensation on the exhaust gas so that the liquefied VOC gas flows to the recovery device through the recovery pipeline; and Uncondensed VOC gas and CO2 gas flow into the pressurizing device through corresponding pipelines, and then flow into the secondary condensing device for secondary condensation after being pressurized by the pressurizing device.

2. The gas treatment system according to claim 1, characterized in that The primary condensing device comprises: a first condensing chamber and a first condenser; A first condensation tube is disposed in the first condensation chamber; and The first condenser is connected to the first condensing chamber through a pipeline to transport the refrigerant in the first condenser to the first condensing chamber.

3. The gas treatment system according to claim 2, characterized in that The first condenser is suitable for providing a gas passage for VOC gas and CO2 gas; The lower end of the first condenser is connected to a recovery device; The upper end of the first condensing pipe is connected to the pressurizing device.

4. The gas treatment system according to claim 3, characterized in that: The secondary condensing device comprises: a second condensing chamber and a second condenser; A second condensation tube is disposed in the second condensation chamber; and The second condenser is connected to the second condensing chamber through a pipeline so as to transport the refrigerant in the second condenser to the second condensing chamber.

5. The gas treatment system according to claim 4, characterized in that The lower end of the second condensing pipe is connected to the pressurizing device; and The lower end of the second condenser is also provided with an interface connected to the recovery pipeline.

6. The gas treatment system according to claim 5, characterized in that Also includes: Heat exchange device; The heat exchange device is connected to the secondary condensing device; in The heat exchange device is suitable for heating the gas flowing out of the secondary condensing device; and A gas collecting chamber is provided downstream of the heat exchange device to collect the heated gas.

7. The gas processing system according to claim 1, characterized in that: Also includes: Pretreatment device; The pretreatment device is arranged upstream of the primary condensation device to filter and adsorb water vapor on the gas before entering the primary condensation device.

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