Method and Application for Capturing and Converting Carbon Dioxide in Industrial Flue Gas

Abstract

This patent claim provides a method and application of carbon dioxide capture and conversion of industrial flue gas, and relates to the technical field of carbon dioxide capture. The method of carbon dioxide capture and conversion of industrial flue gas includes the following steps: industrial flue gas is sent to the top of a cyclone, the flue gas flow rotates downward along the cylinder wall at the top of the cyclone, and at the same time, fresh air is sent to the bottom of the cyclone, the air flow rotates downward along the cylinder wall at the bottom of the cyclone, and the cyclone is cooled, and the industrial flue gas and the air react with each other under the conditions of a temperature of 10°C or less and a pressure of 0.12MPa or more to generate a mixed acid containing carbon dioxide, which captures and converts the carbon dioxide in the industrial flue gas. The overall process flow is simple and fast, and can effectively capture the carbon dioxide in the industrial flue gas. It is low cost, safe and has high practical value, and can be applied to flue gas purification and compound fertilizer preparation.

Description

Technical Field

[0001] This patent claim relates to the field of carbon dioxide capture technology, specifically to the method and application of industrial flue gas carbon dioxide capture and conversion.

Background Art

[0002] Currently in industry, common carbon dioxide capture methods include technical means such as chemical adsorption, physical adsorption, high-pressure liquefaction, and molecular sieves. For example, the two-phase absorbent for capturing CO2 disclosed in Publication No. CN114602294A captures carbon dioxide by means of chemical adsorption. Also, the integrated system for the enrichment liquefaction process of carbon dioxide in industrial exhaust gas disclosed in the Granted Publication No. CN214222307U captures and stores carbon dioxide by the method of high-pressure liquefaction.

[0003] However, in the actual production process, the process of the adsorption method is complex, and its stability and safety are relatively poor. High-pressure liquefaction is prone to safety accidents such as leakage, with high costs, making it difficult to apply on a large scale in industry.

Summary of the Invention

Means for Solving the Problems

[0004] This patent claim aims to propose a method for industrial flue gas carbon dioxide capture and conversion, the overall process method of which is simple and fast, can efficiently capture carbon dioxide in industrial flue gas, has low costs, and high safety and practical value.

[0005] Another object of this patent claim is to propose a method for industrial flue gas carbon dioxide capture and conversion applied to industrial flue gas purification treatment.

[0006] Another object of this patent claim is also to propose a method for industrial flue gas carbon dioxide capture and conversion applied to converting industrial flue gas to prepare compound fertilizers.

[0007] In the claims, the following technical solutions are used to solve the technical problems. In the first aspect, the claims propose a method for collecting and converting carbon dioxide from industrial flue gas, including the following steps: feeding the industrial flue gas into the upper part of a cyclone, rotating the flue gas flow downward along the cylinder wall at the upper part of the cyclone, and at the same time, feeding fresh air into the lower part of the cyclone, rotating the air flow downward along the cylinder wall at the lower part of the cyclone, and cooling the cyclone to react the industrial flue gas and air under the conditions of a temperature of 10°C or lower and a pressure of 0.12 MPa or higher to generate a mixed acid containing carbonic acid, thereby collecting and converting the carbon dioxide in the industrial flue gas.

[0008] In the second aspect, the claims propose a method for collecting and converting carbon dioxide from industrial flue gas applied to the purification treatment of industrial flue gas.

Advantages of the Invention

[0009] Compared with the prior art, the embodiments of the claims have at least the following advantages or beneficial effects.

[0010] For the first aspect, in the embodiments of the present patent claim, a method for collecting and converting carbon dioxide from industrial flue gas is proposed. The industrial flue gas is fed into the upper half of the cylindrical body of the cyclone through a blower, nozzle or other device, pressurized and injected into the cyclone, and the industrial flue gas is rotated downward at high speed along the side wall of the cyclone in the form of an air current. Similarly, fresh external air is fed into the lower half of the conical cylinder of the cyclone through a air compressor, nozzle or other device, pressurized and injected into the cyclone, and the fresh air is also rotated downward at high speed along the side wall of the cyclone in the form of an air current. In this process, the rotational speed of the air current is greater than that of the flue gas current, and the upper flue gas current is dragged by the pressure difference and accelerated to rotate downward. At the same time, when the cyclone is cooled, finally a "supergravity centrifugal refrigeration pressure field" is formed on the inner wall of the cyclone, the temperature is below 10 °C, and the pressure is above 0.12 MPa. Under these conditions, the moisture in the industrial flue gas is condensed into droplets, and carbon monoxide, carbon dioxide in the flue gas and fresh air can react rapidly to produce carbonic acid by changing the chemical reaction pressure equilibrium parameters that are difficult to react under normal conditions under the pressure and temperature conditions provided by the "supergravity centrifugal refrigeration pressure field". Similarly, harmful substances such as nitrogen monoxide, nitrogen dioxide, and sulfur dioxide contained in industrial flue gas can also be reacted to produce corresponding acids. The relevant reactions are as follows (Equation 1):

[0011]

Equation

[0012] The flow of the overall process method is simple, the carbon dioxide in the industrial flue gas can be efficiently collected, and at the same time, the industrial flue gas can be purified. It has low cost, is economical and environmentally friendly, and the process flow is safe, stable and has high practical value.

[0013] For the second aspect, in the embodiments of the present patent claim, a method for collecting and converting carbon dioxide from industrial flue gas applied to the purification treatment of industrial flue gas is proposed. By repeatedly processing the industrial flue gas in multiple stages in this method, different collection and purification effects can be obtained.

[0014] For the third aspect, in the embodiments of the present patent claims, a method for industrial flue gas carbon dioxide capture and conversion applied to converting industrial flue gas and preparing compound fertilizers is proposed. In the process of treating industrial flue gas by this method, liquid nitrogen or aqueous ammonia is appropriately introduced into the cyclone and reacted with carbonic acid obtained under the conditions provided by the "supergravity centrifugal refrigeration pressure field" to produce ammonium bicarbonate compound fertilizer containing a small amount of ammonium nitrate and ammonium sulfate. Also, if it is simply dehydrated, an agricultural compound fertilizer with an ammonium bicarbonate content of more than 97% can be obtained. The related reaction is as follows (Equation 2):

[0015]

Equation

Brief Description of the Drawings

[0016] To more clearly explain the technical solutions of the embodiments of the present patent claims, the attached drawings used in those embodiments are briefly described below. The attached drawings show some of the embodiments of the present patent claims and should not be regarded as limiting the scope. Those skilled in the art should understand that they can obtain other drawings based on these drawings without creative effort.

Figure 1

Description of the Reference Numerals

[0017] 1. Housing. 11. Sealing barrier. 2. Cyclone. 21. Cylindrical barrel. 22. Conical barrel. 23. Cooling chamber. 3. First chamber. 4. Second chamber. 5. First air nozzle. 6. Second air nozzle. 7. Injection pipe. 8. Collection pipe. 81. Exhaust pipe. 9. Collection box. 100. Circulating cooling device. 101. Inlet. 102. Outlet. 200. Medium-high pressure blower. 300. Air compressor.

Modes for Carrying Out the Invention

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present patent claim clearer, in the following, in accordance with the drawings in the embodiments of the present patent claim, the technical solutions in the embodiments of the present patent claim are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present patent claim, not all of the embodiments. Usually, the components of the embodiments of the present patent claim as described and shown in the drawings of the present patent claim can be configured and designed in various different arrangements.

[0019] Where specific conditions are not specified in the embodiments, they follow normal conditions or the conditions proposed by the manufacturer. Where the manufacturer is not specified for the reagents and instruments used, they are ordinary commercially available products.

[0020] Therefore, the detailed description of the embodiments of the present patent claim in the following drawings is not intended to limit the scope of the patent claim seeking protection, but only represents the selected embodiments in the patent claim. Based on the embodiments of the present patent claim, all other embodiments obtained by those skilled in the art without creative efforts are included in the scope of protection of the present patent claim.

[0021] Note: Since similar icons and characters indicate similar items in the following drawings, once an item is defined in one drawing, no further definition and interpretation are required in subsequent drawings.

[0022] In the description of the embodiments of the claims, although it is explained here, when there are terms indicating orientation and positional relationships such as "upper", "lower", "inner", "outer", etc., it is only for the purpose of facilitating the description of the claims and simplifying the explanation based on the orientation and positional relationships shown in the drawings or the normal placement orientation and positional relationships when the product of the present invention is used, and it does not indicate or imply that the device or element must have a specific orientation, be configured and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the claims. Furthermore, terms such as "first" and "second" are only used for the purpose of distinct description and are not understood as indicating or suggesting relative importance.

[0023] In the description of the embodiments of the claims, "a plurality" means at least two. In the description of the embodiments of the claims, although it is also explained here, unless there are other clear regulations or restrictions, when there are terms that should be widely understood such as "setting", "connection", etc., for example, it may be a fixed connection, a removable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two elements. Those skilled in the art can understand the specific meaning of the above terms in the claims according to the specific situation.

[0024] When there is no conflict, the embodiments and features in the embodiments of the claims can be combined with each other. The following will explain the claims in detail with reference to specific embodiments.

[0025] In the embodiments of the present patent claim, a method for collecting and converting carbon dioxide from industrial flue gas is proposed, including the following steps: feeding industrial flue gas into the upper part of a cyclone, rotating the flue gas flow downward along the cylinder wall at the upper part of the cyclone, and at the same time, feeding fresh air into the lower part of the cyclone, rotating the air flow downward along the cylinder wall at the lower part of the cyclone, and cooling the cyclone to react industrial flue gas and air under the conditions of a temperature of 10°C or lower and a pressure of 0.12 MPa or higher to generate a mixed acid containing carbonic acid, thereby collecting and converting carbon dioxide in the industrial flue gas.

[0026] In the above embodiment, industrial flue gas is fed into the upper half of the cylindrical barrel of the cyclone through a blower, nozzle or other device, the industrial flue gas is pressurized and injected into the cyclone, and the industrial flue gas is rotated downward at high speed along the side wall of the cyclone in the form of an air flow. Similarly, external fresh air is fed into the lower half of the conical barrel of the cyclone through an air compressor, nozzle or other device, the fresh air is pressurized and injected into the cyclone, and similarly, the fresh air is rotated downward at high speed along the side wall of the cyclone in the form of an air flow. In this process, the rotation speed of the air flow is greater than that of the flue gas flow, and the upper flue gas flow is dragged by the pressure difference and accelerates to rotate downward. At the same time, when the cyclone is cooled, finally a "supergravity centrifugal refrigeration pressure field" is formed along the wall inside the cyclone, with a temperature of 10°C or lower and a pressure of 0.12 MPa or higher. Under these conditions, the moisture in the industrial flue gas condenses into droplets, and carbon monoxide, carbon dioxide in the flue gas and fresh air change the chemical reaction pressure equilibrium parameters that are difficult to react under normal conditions under the pressure and temperature conditions provided by the "supergravity centrifugal refrigeration pressure field" and can react quickly to generate carbonic acid. Similarly, harmful substances such as nitrogen monoxide, nitrogen dioxide, and sulfur dioxide contained in industrial flue gas can also react to generate corresponding acids.

[0027] The flow of the overall process method is simple, carbon dioxide in industrial flue gas can be efficiently collected, and at the same time, industrial flue gas can be purified. It has low cost, is economical and environmentally friendly, and the process flow is safe, stable and has high practical value.

[0028] Furthermore, in some embodiments of the present patent claim, industrial flue gas is sent into the upper part of the cyclone through a medium and high-pressure blower, and the pressure is 4500 - 7500 Pa. Fresh air is sent into the lower part of the cyclone through an air compressor, and the pressure is 0.6 - 0.8 MPa.

[0029] Furthermore, in some embodiments of the present patent claim, the tangential velocity during the rotation of the flue gas flow is 14 - 40 m / s. The tangential velocity during the rotation of the air flow is 60 - 150 m / s.

[0030] Furthermore, in some embodiments of the present patent claim, the cyclone is cooled through a cooling medium, and the temperature of the cooling medium is 5°C to -15°C.

[0031] In the above embodiments, by controlling conditions such as pressure, the flow rate of the air flow, and the cooling temperature, a "supergravity centrifugal refrigeration pressure field" can be formed inside the cyclone, which can help the progress of the reaction, enhance the effect of carbon dioxide capture and conversion, and is more advantageous for industrial production.

[0032] Furthermore, in some embodiments of the present patent claim, the following device: including a housing 1, a cyclone 2 is provided in the housing 1, and the bottom of the cyclone 2 is connected to the bottom of the housing 1. A chamber is formed between the cyclone 2 and the housing 1, and a sealing barrier 11 is provided inside the chamber. The sealing barrier 11 is provided on the cyclone 2 and connected to the inner wall of the housing 1. The sealing barrier 11 divides the chamber into a first chamber 3 and a second chamber 4, and the first chamber 3 is located above the second chamber 4. A cooling chamber 23 is provided on the side wall of the cyclone 2, and a first injection kit and a second injection kit are also provided on the side wall of the cyclone 2. The first injection kit is located in the first chamber 3, and the second injection kit is located in the second chamber 4.

[0033] In the above-described embodiment, when actually in use, industrial flue gas is fed into the first chamber 3 inside the housing 1 through a device such as a blower, and is injected into the cyclone 2 at high speed through the first injection kit, and is rotated downward along the inner wall of the cyclone 2. In this process, the cooling chamber 23 is filled with a cooling medium, and the rotating flue gas can be cooled. At the same time, fresh air is fed into the second chamber 4, and is injected into the cyclone 2 at high speed through the second injection kit, and is similarly rotated along the inner wall of the cyclone 2. At this time, there is a flue gas airflow rotating downward at high speed at the upper part of the conical cylinder, and an air airflow rotating downward at high speed at the lower part. The high-speed airflow at the upper part is dragged by the pressure difference generated by the high-speed airflow at the lower part, and rotates downward along the inner wall of the cyclone 2 at a higher speed while rotating, and finally a wall-running "supergravity centrifugal refrigeration pressure field" is formed inside the cyclone 2 by the cooling medium in the cooling chamber 23. Under these conditions, the moisture in the industrial flue gas is condensed into droplets, and carbon monoxide, carbon dioxide in the flue gas and fresh air change the chemical reaction pressure balance parameters that are difficult to react under normal conditions under the pressure and temperature conditions provided by the "supergravity centrifugal refrigeration pressure field", and can react quickly to generate carbonic acid. Similarly, harmful substances such as nitrogen monoxide, nitrogen dioxide, and sulfur dioxide contained in industrial flue gas can also be reacted to generate corresponding acids. Liquid nitrogen or aqueous ammonia is appropriately introduced into the cyclone 2, and reacted with the carbonic acid obtained under the conditions provided by the "supergravity centrifugal refrigeration pressure field" to generate an ammonium bicarbonate compound fertilizer containing a small amount of ammonium nitrate and ammonium sulfate. Also, if it is simply dehydrated, an agricultural compound fertilizer with an ammonium bicarbonate content of 97% or more can be obtained.

[0034] The structure of the entire device is simple, the collection of carbon dioxide in the flue gas can be realized while purifying the flue gas, and the collected carbon dioxide can be converted into a composite nitrogen fertilizer, realizing the recycling of resources. The flow of the overall process method during use is safe, stable, simple, fast, highly stable, low in cost, and has characteristics such as energy saving, emission reduction, economic environmental protection, and resource conservation, and has high practical value.

[0035] Furthermore, in some embodiments of the present patent claim, the first injection kit includes a plurality of first air flow nozzles 5, the second injection kit includes a plurality of second air flow nozzles 6, both the first air flow nozzle 5 and the second air flow nozzle 6 penetrate through the side wall of the cyclone 2, the intake ends of both the first air flow nozzle 5 and the second air flow nozzle 6 are located within the chamber, and the exhaust ends are located within the cyclone 2 and are at a position lower than the intake ends.

[0036] In the above embodiment, through the plurality of first air flow nozzles 5 and the plurality of second air flow nozzles 6 that are inclined downward toward the inside of the cyclone 2, it is possible to more effectively rotate the air flow downward at high speed along the inner wall of the cyclone 2. Among them, the injection speed of the air flow of the second nozzle is greater than that of the first air flow nozzle 5, and the upper flue gas air flow will be accelerated and dragged by the pressure difference.

[0037] Furthermore, in some embodiments of the present patent claim, the cyclone 2 includes a cylindrical body 21 and a conical body 22. One end with the larger diameter of the conical body 22 is connected to the end of the cylindrical body 21, and one end with the smaller diameter of the conical body 22 is connected to the bottom of the housing 1 and is in communication with the outside. The sealing barrier 11 is located between the cylindrical body 21 and the conical body 22. The cylindrical body 21 is located in the first chamber 3, and the conical body 22 is located in the second chamber 4.

[0038] In the above embodiment, by doing so, the structure of the device is more rationalized and the collection effect is improved.

[0039] Furthermore, in some embodiments of the present patent claim, the device includes a circulation cooling device 100. The circulation cooling device 100 is provided with an outlet 102 and an inlet 101. The outlet 102 is communicated with the bottom of the cooling chamber 23 through a pipe, and the inlet 101 is communicated with the top of the cooling chamber 23 through a pipe.

[0040] In the above-described embodiment, by sending fresh air into the second chamber 4 through the injection pipe 7 and simultaneously adding liquid nitrogen or aqueous ammonia, the collected carbon dioxide can be reacted to convert it into ammonium bicarbonate compound fertilizer, thereby realizing the recycling of resources.

[0041] In the embodiment of the present patent claim, a method for collecting and converting carbon dioxide from industrial flue gas also submits an application for the purification treatment of industrial flue gas. In the embodiment of the present patent claim, an application for converting industrial flue gas to prepare compound fertilizer is also submitted. The following will describe in detail the features and performance of the present patent claim in accordance with the embodiment.

[0042] (Embodiment 1) In this embodiment, a method for collecting and converting carbon dioxide from industrial flue gas is submitted, including the following steps: sending industrial flue gas into the upper part of the cyclone at a pressure of 4500 Pa through a medium-high pressure blower, rotating the flue gas flow downward along the side wall of the upper part of the cyclone at a tangential velocity of 14 m / s, and simultaneously sending fresh air into the lower half of the cyclone at a pressure of 0.6 MPa through an air compressor, sending fresh air into the lower part of the cyclone, rotating the air flow downward along the side wall of the lower part of the cyclone at a tangential velocity of 60 m / s, cooling the cyclone through a cooling medium with a temperature of 5°C, reacting industrial flue gas and air under the conditions of a temperature of 10°C or lower and a pressure of 0.12 MPa or higher to generate a mixed acid containing carbonic acid, and collecting and converting carbon dioxide in the industrial flue gas.

[0043] (Embodiment 2) In this embodiment, a method for collecting and converting carbon dioxide from industrial flue gas is proposed, including the following steps: Through a medium-high pressure blower, the industrial flue gas is sent into the upper part of the cyclone at a pressure of 7500 Pa, and the flue gas flow is rotated downward along the side wall of the upper part of the cyclone at a tangential velocity of 40 m / s. At the same time, through an air compressor, fresh air is sent into the lower half of the cyclone at a pressure of 0.8 MPa, the fresh air is sent into the lower part of the cyclone, and the air flow is rotated downward along the side wall of the lower part of the cyclone at a tangential velocity of 150 m / s. The cyclone is cooled through a cooling medium with a temperature of -15 °C, and the industrial flue gas and air are reacted under the conditions of a temperature of 10 °C or lower and a pressure of 0.12 MPa or higher to generate a mixed acid containing carbonic acid, thereby collecting and converting the carbon dioxide in the industrial flue gas.

[0044] (Embodiment 3) In this embodiment, a method for collecting and converting carbon dioxide from industrial flue gas is proposed, including the following steps: Through a medium-high pressure blower, the industrial flue gas is sent into the upper part of the cyclone at a pressure of 6000 Pa, and the flue gas flow is rotated downward along the side wall of the upper part of the cyclone at a tangential velocity of 30 m / s. At the same time, through an air compressor, fresh air is sent into the lower half of the cyclone at a pressure of 0.8 MPa, the fresh air is sent into the lower part of the cyclone, and the air flow is rotated downward along the side wall of the lower part of the cyclone at a tangential velocity of 120 m / s. The cyclone is cooled through a cooling medium with a temperature of -10 °C, and the industrial flue gas and air are reacted under the conditions of a temperature of 10 °C or lower and a pressure of 0.12 MPa or higher to generate a mixed acid containing carbonic acid, thereby collecting and converting the carbon dioxide in the industrial flue gas.

[0045] (Embodiment 4) Referring to Figure 1, in this embodiment, a method for collecting and converting carbon dioxide from industrial flue gas is proposed, which is realized by the following device: It includes a housing 1, and a cyclone 2 is provided in the housing 1, and the bottom of the cyclone 2 is connected to the bottom of the housing 1. A chamber is formed between the cyclone 2 and the housing 1, and a sealing barrier 11 is provided inside the chamber. The sealing barrier 11 is provided on the cyclone 2 and connected to the inner wall of the housing 1. The sealing barrier 11 divides the chamber into a first chamber 3 and a second chamber 4, and the first chamber 3 is located above the second chamber 4. A cooling chamber 23 is provided on the side wall of the cyclone 2, and a first injection kit and a second injection kit are also provided on the side wall of the cyclone 2. The first injection kit is located in the first chamber 3, and the second injection kit is located in the second chamber 4.

[0046] The first injection kit includes a plurality of first air flow nozzles 5, and the second injection kit includes a plurality of second air flow nozzles 6. Both the first air flow nozzle 5 and the second air flow nozzle 6 penetrate through the side wall of the cyclone 2. The intake ends of both the first air flow nozzle 5 and the second air flow nozzle 6 are located in the chamber, and the exhaust ends are located in the cyclone 2 and at a position lower than the intake ends.

[0047] The cyclone 2 includes a cylindrical body 21 and a conical body 22. One end with the larger diameter of the conical body 22 is connected to the end of the cylindrical body 21, and one end with the smaller diameter of the conical body 22 is connected to the bottom of the housing 1 and communicates with the outside. The sealing barrier 11 is located between the cylindrical body 21 and the conical body 22. The cylindrical body 21 is located in the first chamber 3, and the conical body 22 is located in the second chamber 4.

[0048] The device also includes a circulating cooling device 100. The circulating cooling device 100 is provided with an outlet 102 and an inlet 101. The outlet 102 is communicated with the bottom of the cooling chamber 23 through a pipe, and the inlet 101 is communicated with the top of the cooling chamber 23 through a pipe.

[0049] The specific method is as follows: Through the medium and high pressure blower 200, industrial flue gas is sent into the first chamber 3 at a pressure of 6000 Pa, and the flue gas is injected into the cyclone 2 through the first air nozzle 5, forming a flue gas flow and rotating downward along the side wall at the upper part of the cyclone 2 at a tangential velocity of 30 m / s. At the same time, through the air compressor 300 at a pressure of 0.8 MPa, fresh air is sent into the second chamber 4, and the air is injected into the cyclone 2 through the second air nozzle 6, forming an air flow and rotating downward along the side wall at the lower part of the cyclone 2 at a tangential velocity of 120 m / s. At the same time, through the circulation cooling device 100, a cooling medium with a temperature of -10 °C is passed into the cooling chamber 23 through the outlet 102 to cool the cyclone 2, and the circulating medium in the cooling chamber 23 is recovered through the inlet 101. Finally, the industrial flue gas and air are reacted under the conditions that the temperature is below 10 °C and the pressure is above 0.12 MPa to generate a mixed acid containing carbonic acid, and the carbon dioxide in the industrial flue gas is collected and converted.

[0050] (Experimental Example) For the flue gas generated by tire incineration, it is processed using the method for collecting and converting industrial flue gas carbon dioxide proposed in Embodiment 4 of this patent claim, and the changes in detailed state data before and after flue gas treatment are measured and recorded. The specific items and results are shown in Table 1.

[0051]

Table 1

[0052] As a result, using the method for collecting and converting industrial flue gas carbon dioxide proposed in this patent claim to treat the flue gas generated by tire incineration, the total amount of discharged flue gas decreased by 53.6%, the water vapor was condensed into liquid water and 89.7% was recovered, CO 2 was converted to H 2 CO 3 at a conversion rate of 66.5%, SO X was converted to H 2 SO 4 at a conversion rate of 99.8%, NO X was converted to HNO 3 at a conversion rate of 81.2%, and the effect is remarkable.

[0053] Summarizing the above, in the embodiments of this patent claim, a method for collecting and converting carbon dioxide in industrial flue gas is proposed. The industrial flue gas is fed into the upper half of the cylindrical body of the cyclone through a blower, nozzle or other device, pressurized and injected into the cyclone, and the industrial flue gas is rotated downward at high speed along the side wall of the cyclone in the form of an air current. Similarly, fresh external air is fed into the lower half of the conical cylinder of the cyclone through an air compressor, nozzle or other device, pressurized and injected into the cyclone, and the fresh air is also rotated downward at high speed along the side wall of the cyclone in the form of an air current. In this process, the rotation speed of the air current is greater than that of the flue gas current, and the upper flue gas current is dragged by the pressure difference and accelerates to rotate downward. At the same time, when the cyclone is cooled, finally a "supergravity centrifugal refrigeration pressure field" is formed on the inner wall of the cyclone. The temperature is below 10°C and the pressure is above 0.12 MPa. Under these conditions, the moisture in the industrial flue gas condenses into droplets, and carbon monoxide, carbon dioxide in the flue gas and fresh air change the chemical reaction pressure equilibrium parameters that are difficult to react under normal conditions under the pressure and temperature conditions provided by the "supergravity centrifugal refrigeration pressure field" and can react quickly to generate carbonic acid. Similarly, harmful substances such as nitrogen monoxide, nitrogen dioxide, and sulfur dioxide contained in the industrial flue gas can also react to generate corresponding acids. The flow of the overall process method is simple, the carbon dioxide in the industrial flue gas can be efficiently collected, and at the same time, the industrial flue gas can be purified. It has low cost, is economical and environmentally friendly. The process flow is safe, stable, has high practical value, and can also be applied to the purification of industrial flue gas and the conversion and preparation of compound fertilizers.

[0054] The above is only the preferred embodiment of this patent claim and is not used to limit this patent claim. Those skilled in the art may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. within the scope of the spirit and principle of this patent claim should be included within the protection scope of this patent claim.

Claims

1. Including the following steps: feeding industrial flue gas into the upper part of the cyclone, rotating the flue gas flow downward along the inner wall at the upper part of the cyclone, simultaneously feeding fresh air into the lower part of the cyclone, rotating the air flow downward along the inner wall at the lower part of the cyclone, and cooling the cyclone to react industrial flue gas and air under the conditions that the temperature is 10°C or lower and the pressure is 0.12 MPa or higher to generate a mixed acid containing carbonic acid, collecting and converting carbon dioxide in the industrial flue gas, feeding industrial flue gas into the upper part of the cyclone through a medium-high pressure blower with a pressure of 4500 - 7500 Pa, and feeding fresh air into the lower part of the cyclone through an air compressor with a pressure of 0.6 - 0.8 MPa. A method for collecting and converting carbon dioxide in industrial flue gas is characterized by this.

2. The tangential velocity during the rotation of the flue gas flow is 14 - 40 m / s, and the tangential velocity during the rotation of the air flow is 60 - 150 m / s. The method for collecting and converting carbon dioxide in industrial flue gas according to Claim 1 is characterized by this.

3. Cooling the cyclone through a cooling medium, and the temperature of the cooling medium is 5°C to -15°C. The method for collecting and converting carbon dioxide in industrial flue gas according to Claim 1 is characterized by this.

4. The following device: including a housing, a cyclone is provided in the housing, the bottom of the cyclone is connected to the bottom of the housing, a chamber is formed between the cyclone and the housing, a sealing barrier is provided inside the chamber, the sealing barrier is provided on the cyclone and connected to the inner wall of the housing, the sealing barrier divides the chamber into a first chamber and a second chamber, the first chamber is located above the second chamber, a cooling chamber is provided on the side wall of the cyclone, a first injection kit and a second injection kit are also provided on the side wall of the cyclone, the first injection kit is located in the first chamber, and the second injection kit is located in the second chamber. The method for collecting and converting carbon dioxide in industrial flue gas according to Claim 1 is characterized by being realized by such a device.

5. The first injection kit includes a plurality of first air flow nozzles, and the second injection kit includes a plurality of second air flow nozzles. Both the first air flow nozzles and the second air flow nozzles penetrate the side wall of the cyclone. The intake ends of both the first air flow nozzles and the second air flow nozzles are located within the chamber, and the exhaust ends are located within the cyclone and are at a position lower than the intake ends. The method for collecting and converting carbon dioxide from industrial flue gas according to claim 4 is characterized by this.

6. The cyclone includes a cylindrical body and a conical body. One end with the larger diameter of the conical body is connected to the end of the cylindrical body, and one end with the smaller diameter of the conical body is connected to the bottom of the housing and communicates with the outside. The sealing barrier is located between the cylindrical body and the conical body. The cylindrical body is located in the first chamber, and the conical body is located in the second chamber. The method for collecting and converting carbon dioxide from industrial flue gas according to claim 4 is characterized by this.

7. The device includes a circulation cooling device. The circulation cooling device is provided with an inlet and an outlet. The outlet communicates with the bottom of the cooling chamber through a pipe, and the inlet communicates with the top of the cooling chamber through a pipe. The method for collecting and converting carbon dioxide from industrial flue gas according to claim 4 is characterized by this.

8. In claim 7, it is a method for collecting and converting carbon dioxide from industrial flue gas applied to the purification treatment of industrial flue gas.

Images