Oxygen-enriched combustion carbon capture system and method for sleeve kiln

Abstract

The invention relates to an oxygen-enriched combustion carbon capture system for a sleeve kiln, comprising: a sleeve kiln, which is internally provided with an upper inner sleeve and a lower inner sleeve, and is provided with a lower self-suction air inlet, a lower inner sleeve cooling air inlet, a lower inner sleeve cooling air outlet and a lower inner sleeve fuel inlet which are communicated with the lower inner sleeve; the device further comprises a flue gas treatment system, a flue gas collection system, a pure oxygen pipeline, a combustion-supporting gas pipeline, an under-kiln self-suction air pipeline, a fuel pipeline, a driving air pipeline, a lower inner sleeve cooling air input pipeline, a lower inner sleeve cooling air output pipeline, an upper inner sleeve cooling air input pipeline and an upper inner sleeve cooling air output pipeline. According to the invention, the interior of the sleeve kiln can be prevented from being greatly transformed, the content of oxygen in the collected flue gas is low, the enrichment degree of carbon dioxide is high and can reach more than 80%, and the capture, storage or resource utilization of CO2 can be realized at lower cost; and the utilization rate of pure oxygen is high.

Description

Technical Field

[0001] The present application relates to energy-saving and environmental protection technologies, and in particular to oxygen-enriched combustion carbon capture technology. Background Art

[0002] Carbon capture during combustion is oxygen-enriched combustion technology. It is based on the existing power plant boiler system and uses high-purity oxygen to replace the combustion air. At the same time, it is assisted by flue gas circulation combustion technology to obtain up to 80% CO2-enriched volume concentration. 2 Flue gas can be condensed and compressed to achieve CO 2 Permanent storage or resource utilization; it has many advantages such as relatively low cost, easy scalability, and the ability to transform existing units. It is considered to be one of the CCUS (Carbon Capture, Utilization and Storage) technologies that is most likely to be promoted and commercialized on a large scale. The application of oxygen-enriched combustion technology to sleeve kilns will play an important role in reducing pollutants, especially carbon emissions, in the lime kiln roasting process.

[0003] The application of oxygen-enriched combustion technology in sleeve kilns usually requires a pure oxygen source. Existing sleeve kilns usually use air as the combustion medium. If high-purity oxygen is required as the combustion medium, the interior of the sleeve kiln needs to be substantially modified to adapt to the new working conditions. In addition, using high-purity oxygen as the combustion medium will result in a large amount of residual oxygen in the collected flue gas, making carbon capture difficult. At the same time, it will also make the utilization rate of pure oxygen not high enough, resulting in a lot of waste. Summary of the invention

[0004] The embodiments of the present application provide an oxygen-enriched combustion carbon capture system and method for a sleeve kiln to solve the technical problems that the application of oxygen-enriched combustion technology to a sleeve kiln requires significant equipment modification, carbon capture is difficult, and the utilization rate of pure oxygen is low.

[0005] In a first aspect, an embodiment of the present application provides an oxygen-enriched combustion carbon capture system for a sleeve kiln, the oxygen-enriched combustion carbon capture system for a sleeve kiln comprising:

[0006] A sleeve kiln, wherein an upper inner sleeve and a lower inner sleeve are arranged inside the sleeve kiln, and a kiln lower self-suction air inlet, a lower inner sleeve cooling air inlet, a lower inner sleeve cooling air outlet, and a lower inner sleeve fuel inlet are arranged on the sleeve kiln, and an upper inner sleeve fuel inlet, a flue gas outlet, an upper inner sleeve cooling air inlet, and an upper inner sleeve cooling air outlet are also arranged on the sleeve kiln;

[0007] a flue gas treatment system, connected to the flue gas outlet;

[0008] a flue gas collection system, the flue gas collection system being in communication with the flue gas treatment system;

[0009] Pure oxygen pipeline;

[0010] A combustion-supporting gas pipeline, the combustion-supporting gas pipeline is connected with the flue gas treatment system and the pure oxygen pipeline;

[0011] A self-suction air duct under the kiln, one end of which is connected to the combustion-supporting gas duct, and the other end of which is connected to the self-suction air inlet under the kiln;

[0012] a fuel pipeline, the fuel pipeline being in communication with both the lower inner sleeve fuel inlet and the upper inner sleeve fuel inlet;

[0013] A driving air duct, one end of which is connected to the combustion-supporting gas duct, and the other end of which is connected to the fuel inlet of the lower inner sleeve;

[0014] A lower inner sleeve cooling air input duct, wherein the lower inner sleeve cooling air input duct is connected to the lower inner sleeve cooling air inlet;

[0015] A lower inner sleeve cooling air output duct, wherein the lower inner sleeve cooling air output duct is connected to the lower inner sleeve cooling air outlet;

[0016] An upper inner sleeve cooling air input duct, the upper inner sleeve cooling air input duct being in communication with the upper inner sleeve cooling air inlet;

[0017] The upper inner sleeve cooling air output pipeline is connected with the upper inner sleeve cooling air outlet.

[0018] In some embodiments of the present application, the flue gas treatment system includes a heat exchanger, a first induced draft fan, a dust collector, and a first condenser connected in sequence according to the airflow direction, wherein the flue gas outlet and the first induced draft fan are connected through a heat medium channel of the heat exchanger.

[0019] In some embodiments of the present application, the driving air duct is connected to the fuel inlet of the lower inner sleeve through the refrigerant channel of the heat exchanger.

[0020] In some embodiments of the present application, the lower inner sleeve cooling air input pipe is connected to the combustion-supporting gas pipe, and the lower inner sleeve cooling air output pipe is connected to the fuel pipe.

[0021] In some embodiments of the present application, the lower inner sleeve cooling air output duct is also connected to the lower inner sleeve cooling air input duct through a second condenser.

[0022] In a second aspect, an embodiment of the present application provides an oxygen-enriched combustion carbon capture method for a sleeve kiln, wherein the oxygen-enriched combustion carbon capture method for a sleeve kiln is implemented by the oxygen-enriched combustion carbon capture system for a sleeve kiln described in any embodiment of the first aspect, and the oxygen-enriched combustion carbon capture method for a sleeve kiln comprises the following steps:

[0023] Outputting the smoke from the upper inner sleeve from the smoke outlet and introducing it into the smoke treatment system;

[0024] The flue gas is processed by the flue gas processing system, and a part of the processed flue gas is input into the flue gas collection system, and the other part is input into the combustion-supporting gas pipeline;

[0025] Inputting pure oxygen from the pure oxygen pipeline into the combustion-supporting gas pipeline, so that the flue gas and the pure oxygen are mixed in the combustion-supporting gas pipeline to obtain a combustion-supporting gas in which the volume proportion of oxygen is 30%;

[0026] Input the combustion-supporting gas from the driving air duct into the fuel inlet of the lower inner sleeve, input the combustion-supporting gas through the self-suction air duct under the kiln into the self-suction air inlet under the kiln, and input the combustion-supporting gas from the other end of the combustion-supporting gas duct into the cooling air inlet of the lower inner sleeve;

[0027] The fuel in the fuel pipeline is input into the lower inner sleeve fuel inlet and the upper inner sleeve fuel inlet, so that a combustion reaction occurs in the sleeve kiln and smoke is generated;

[0028] Inputting the combustion-supporting gas from the lower inner sleeve cooling air input pipe into the lower inner sleeve cooling air inlet, cooling the lower inner sleeve, and then outputting the combustion-supporting gas from the lower inner sleeve cooling air output pipe;

[0029] Air is input from the upper inner sleeve cooling air input duct to the upper inner sleeve cooling air inlet, and after cooling the upper inner sleeve, the air is discharged to the environment from the upper inner sleeve cooling air output duct.

[0030] In some embodiments of the present application, part of the treated flue gas is input into the flue gas collection system, and the other part is input into the combustion-supporting gas pipeline, wherein the flow of the flue gas input into the combustion-supporting gas pipeline accounts for 60% to 64% of the flow of the treated flue gas.

[0031] In some embodiments of the present application, the flue gas treatment system includes a heat exchanger, a first induced draft fan, a dust collector, and a first condenser connected in sequence according to the airflow direction, wherein the flue gas outlet and the first induced draft fan are connected through a heat medium channel of the heat exchanger, and the driving air duct is connected to the fuel inlet of the lower inner sleeve through a coolant channel of the heat exchanger.

[0032] In the process of inputting the combustion-supporting gas from the driving air duct into the fuel inlet of the lower inner sleeve, the combustion-supporting gas is first input from the driving air duct into the refrigerant channel of the heat exchanger for heat exchange, and then the heat-exchanged combustion-supporting gas is input from the refrigerant channel of the heat exchanger into the fuel inlet of the lower inner sleeve.

[0033] In some embodiments of the present application, the lower inner sleeve cooling air input pipe is connected to the combustion-supporting gas pipe, the lower inner sleeve cooling air output pipe is connected to the fuel pipe, and the lower inner sleeve cooling air output pipe is also connected to the lower inner sleeve cooling air input pipe through a second condenser.

[0034] The combustion-supporting gas is input from the lower inner sleeve cooling air input pipe to the lower inner sleeve cooling air inlet, and after cooling the lower inner sleeve, the combustion-supporting gas is output from the lower inner sleeve cooling air output pipe, including the following steps:

[0035] The combustion-supporting gas is input from the combustion-supporting gas pipeline into the lower inner sleeve cooling air inlet via the lower inner sleeve cooling air input pipeline. After the combustion-supporting gas cools the lower inner sleeve and is output from the lower inner sleeve cooling air outlet, a part of the combustion-supporting gas is input into the fuel pipeline, and the other part is condensed by the second condenser and then input into the lower inner sleeve cooling air input pipeline for recycling.

[0036] In some embodiments of the present application, the flow rate of the combustion-supporting gas obtained by mixing the flue gas and pure oxygen in the combustion-supporting gas pipeline is 100%.

[0037] The flow rate of the combustion-supporting gas in the driving air duct is 18% to 23%;

[0038] The flow rate of the combustion-supporting gas in the self-suction air duct under the kiln is 35% to 39%;

[0039] The flow rate of the oxidizing gas input into the cooling air inlet of the lower inner sleeve from the other end of the oxidizing gas pipeline is 40% to 45%.

[0040] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0041] The oxygen-enriched combustion carbon capture system for a sleeve kiln provided in the embodiment of the present application can adjust the oxygen content in the combustion-supporting gas by mixing flue gas and pure oxygen to form a combustion-supporting gas, until the existing sleeve kiln can adapt to the working condition of using the combustion-supporting gas as the combustion-supporting medium, thereby avoiding a major modification of the interior of the sleeve kiln; at the same time, after the oxygen content in the combustion-supporting gas is reduced, the oxygen content in the collected flue gas will also decrease accordingly, and the carbon dioxide enrichment degree is high, which can reach more than 80%, and CO can be achieved at a relatively low cost. 2Capture, storage or resource utilization; by mixing flue gas and pure oxygen to form a combustion-supporting gas, the residual oxygen in the flue gas can be reused, thereby increasing the utilization rate of pure oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 A schematic structural diagram of an oxygen-enriched combustion carbon capture system for a sleeve kiln provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] Unless otherwise specified, the terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. In the event of a conflict, this specification takes precedence.

[0047] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0048] When the existing oxygen-enriched combustion technology is applied to sleeve kilns, there are technical problems such as the need for major equipment modifications, difficulty in carbon capture, and low utilization of pure oxygen.

[0049] The technical solution provided by the embodiments of the present application is to solve the above technical problems, and the overall idea is as follows:

[0050] In a first aspect, an embodiment of the present application provides an oxygen-enriched combustion carbon capture system for a sleeve kiln 1, wherein the oxygen-enriched combustion carbon capture system for the sleeve kiln 1 comprises:

[0051] A sleeve kiln 1, wherein an upper inner sleeve and a lower inner sleeve are arranged inside the sleeve kiln 1, and a kiln lower self-suction air inlet, a lower inner sleeve cooling air inlet, a lower inner sleeve cooling air outlet, and a lower inner sleeve fuel inlet are arranged on the sleeve kiln 1, and an upper inner sleeve fuel inlet, a flue gas outlet, an upper inner sleeve cooling air inlet, and an upper inner sleeve cooling air outlet are also arranged on the sleeve kiln 1;

[0052] A flue gas treatment system 2, connected to the flue gas outlet;

[0053] A flue gas collection system 3, wherein the flue gas collection system 3 is connected to the flue gas treatment system 2;

[0054] Pure oxygen pipeline 4;

[0055] A combustion-supporting gas pipeline 5, wherein the combustion-supporting gas pipeline 5 is connected to the flue gas treatment system 2 and the pure oxygen pipeline 4;

[0056] A self-suction air duct 6 under the kiln, one end of which is connected to the combustion-supporting gas duct 5, and the other end of which is connected to the self-suction air inlet under the kiln;

[0057] A fuel pipeline 7, wherein the fuel pipeline 7 is connected to the lower inner sleeve fuel inlet and the upper inner sleeve fuel inlet;

[0058] A driving air duct 8, one end of which is connected to the combustion-supporting gas duct, and the other end of which is connected to the fuel inlet of the lower inner sleeve;

[0059] A lower inner sleeve cooling air input duct 9, wherein the lower inner sleeve cooling air input duct 9 is connected to the lower inner sleeve cooling air inlet;

[0060] A lower inner sleeve cooling air output duct 10, wherein the lower inner sleeve cooling air output duct 10 is connected to the lower inner sleeve cooling air outlet;

[0061] An upper inner sleeve cooling air input pipe 11, wherein the upper inner sleeve cooling air input pipe 11 is connected to the upper inner sleeve cooling air inlet;

[0062] The upper inner sleeve cooling air output pipeline 12 is connected to the upper inner sleeve cooling air outlet.

[0063] It is easy to understand that the flue gas is the product obtained after the combustion reaction of the sleeve kiln 1. The flue gas treatment system 2 generally has functions such as dust removal and condensation, and those skilled in the art can select known equipment to form the flue gas treatment system 2 to achieve the above functions.

[0064] It is easy to understand that the fume collection system 3 generally has functions such as compression and storage, and those skilled in the art can select known equipment to form the fume collection system 3 to achieve the above functions.

[0065] The combustion-supporting gas pipeline 5 contains combustion-supporting gas, one end of which is connected to the flue gas treatment system 2 and the pure oxygen pipeline 4 . The combustion-supporting gas in the combustion-supporting gas pipeline 5 is a mixture of flue gas from the flue gas treatment system 2 and pure oxygen from the pure oxygen pipeline 4 .

[0066] The present invention forms a combustion-supporting gas by mixing flue gas and pure oxygen, and can adjust the oxygen content in the combustion-supporting gas until the existing sleeve kiln 1 can adapt to the working condition of using the combustion-supporting gas as the combustion-supporting medium, thereby avoiding a major modification of the interior of the sleeve kiln 1; at the same time, after the oxygen content in the combustion-supporting gas is reduced, the oxygen content in the collected flue gas will also decrease accordingly, and the carbon dioxide enrichment degree is high, which can reach more than 80%, and CO can be achieved at a relatively low cost. 2 Capture, storage or resource utilization; by mixing flue gas and pure oxygen to form a combustion-supporting gas, the residual oxygen in the flue gas can be reused, thereby increasing the utilization rate of pure oxygen.

[0067] In some embodiments of the present application, the flue gas treatment system 2 includes a heat exchanger 21, a first induced draft fan 22, a dust collector 23, and a first condenser 24 which are connected in sequence according to the airflow direction, wherein the flue gas outlet and the first induced draft fan 22 are connected through a heat medium channel of the heat exchanger 21.

[0068] It is easy to understand that the heat exchanger 21 is used to cool the flue gas.

[0069] In some embodiments of the present application, the driving air duct 8 is connected to the fuel inlet of the lower inner sleeve through the refrigerant channel of the heat exchanger 21.

[0070] It is easy to understand that the flue gas and the combustion-supporting gas input into the heat exchanger 21 by the driving air duct 8 exchange heat in the heat exchanger 21 .

[0071] It should be noted that a section of the driving air duct 8 between the refrigerant channel of the heat exchanger 21 and the fuel inlet of the lower inner sleeve is arranged outside the sleeve kiln, rather than inside. Figure 1 Due to the limitation of the drawing method of the picture, the driving air duct 8 seems to pass through the sleeve kiln, but the driving air duct 8 is actually all arranged outside the sleeve kiln.

[0072] In some embodiments of the present application, the lower inner sleeve cooling air input pipe 9 is connected to the combustion-supporting gas pipe 5 , and the lower inner sleeve cooling air output pipe 10 is connected to the fuel pipe 7 .

[0073] The combustion-supporting gas in the combustion-supporting gas pipeline 5 is input into the lower inner sleeve cooling air input port as cooling air through the lower inner sleeve cooling air input pipeline 9, and after cooling the lower inner sleeve, it is preheated at the same time, and then input into the fuel pipe through the lower inner sleeve cooling air output pipeline 10, and enters the sleeve kiln 1 along with the fuel in the fuel pipe for combustion reaction.

[0074] In some embodiments of the present application, the lower inner sleeve cooling air output duct 10 is also connected to the lower inner sleeve cooling air input duct 9 through a second condenser.

[0075] When the combustion-supporting gas is input as cooling air into the lower inner sleeve cooling air input port, its flow rate needs to be large enough to achieve a good cooling effect; but if the flow rate is large enough, if all of it is input into the fuel pipe, there will be too much oxygen in the sleeve kiln 1, resulting in a waste of pure oxygen raw materials. Therefore, a part of the preheated combustion-supporting gas is input into the second condenser through the lower inner sleeve cooling air output pipe 10 for cooling, and then input into the lower inner sleeve cooling air input pipe 9 for recycling.

[0076] In a second aspect, an embodiment of the present application provides an oxygen-enriched combustion carbon capture method for a sleeve kiln 1, wherein the oxygen-enriched combustion carbon capture method for the sleeve kiln 1 is implemented by the oxygen-enriched combustion carbon capture system for the sleeve kiln 1 described in any embodiment of the first aspect, and the oxygen-enriched combustion carbon capture method for the sleeve kiln 1 comprises the following steps:

[0077] S1: Outputting the smoke from the upper inner sleeve from the smoke outlet and introducing it into the smoke treatment system 2;

[0078] S2: treating the flue gas through the flue gas treatment system 2, inputting a part of the treated flue gas into the flue gas collection system 3, and the other part into the combustion-supporting gas pipeline 5;

[0079] S3: pure oxygen is introduced into the combustion-supporting gas pipeline 5 from the pure oxygen pipeline 4, so that the flue gas and pure oxygen are mixed in the combustion-supporting gas pipeline 5 to obtain a combustion-supporting gas in which the volume proportion of oxygen is 30%;

[0080] S4: inputting the combustion-supporting gas from the driving air duct 8 into the fuel inlet of the lower inner sleeve, inputting the combustion-supporting gas through the kiln lower self-absorption air duct 6 into the kiln lower self-absorption air inlet, and inputting the combustion-supporting gas from the other end of the combustion-supporting gas duct 5 into the lower inner sleeve cooling air inlet;

[0081] S5: The fuel in the fuel pipeline 7 is input into the lower inner sleeve fuel inlet and the upper inner sleeve fuel inlet, so that a combustion reaction occurs in the sleeve kiln 1 and smoke is generated;

[0082] S6: input cooling air from the lower inner sleeve cooling air input pipe 9 to the lower inner sleeve cooling air inlet, cool the lower inner sleeve, and then output from the lower inner sleeve cooling air output pipe 10;

[0083] S7: air is input from the upper inner sleeve cooling air input duct 11 to the upper inner sleeve cooling air inlet, and after cooling the upper inner sleeve, the air is released to the environment from the upper inner sleeve cooling air output duct 12.

[0084] In some embodiments of the present application, part of the treated flue gas is input into the flue gas collection system 3, and the other part is input into the combustion-supporting gas pipeline 5, wherein the flow rate of the flue gas input into the combustion-supporting gas pipeline 5 accounts for 60% to 64% of the flow rate of the treated flue gas.

[0085] It is easy to understand that the beneficial effect of controlling the flow rate of the flue gas input into the combustion-supporting gas pipeline 5 to be 60% to 64% of the flow rate of the treated flue gas is that the volume proportion of oxygen in the combustion-supporting gas can be adjusted to 30% within this range.

[0086] In some embodiments of the present application, the flue gas treatment system 2 includes a heat exchanger 21, a first induced draft fan 22, a dust collector 23, and a first condenser 24, which are connected in sequence according to the airflow direction, wherein the flue gas outlet and the first induced draft fan 22 are connected through the heat medium channel of the heat exchanger 21, and the driving air duct 8 is connected to the fuel inlet of the lower inner sleeve through the refrigerant channel of the heat exchanger 21.

[0087] In the process of inputting the combustion-supporting gas from the driving air duct 8 into the fuel inlet of the lower inner sleeve, the combustion-supporting gas is first input from the driving air duct 8 into the refrigerant channel of the heat exchanger 21 for heat exchange, and then the heat-exchanged combustion-supporting gas is input from the refrigerant channel of the heat exchanger 21 into the fuel inlet of the lower inner sleeve.

[0088] The flue gas and the combustion-supporting gas input into the heat exchanger 21 through the driving air duct 8 are heat-exchanged in the heat exchanger 21 , so that the waste heat of the flue gas can be fully utilized.

[0089] In some embodiments of the present application, the lower inner sleeve cooling air input pipe 9 is connected to the combustion-supporting gas pipe 5, the lower inner sleeve cooling air output pipe 10 is connected to the fuel pipe 7, and the lower inner sleeve cooling air output pipe 10 is also connected to the lower inner sleeve cooling air input pipe 9 through a second condenser.

[0090] The combustion-supporting gas is input into the lower inner sleeve cooling air inlet from the lower inner sleeve cooling air input pipe 9, the combustion-supporting gas cools the lower inner sleeve and is output from the lower inner sleeve cooling air outlet, and then output from the lower inner sleeve cooling air output pipe 10, including the following steps:

[0091] S61: The combustion-supporting gas is input from the combustion-supporting gas pipeline 5 to the lower inner sleeve cooling air inlet via the lower inner sleeve cooling air input pipeline 9. After cooling the lower inner sleeve, a part of the combustion-supporting gas is input to the fuel pipeline 7, and the other part is condensed by the second condenser and then input to the lower inner sleeve cooling air input pipeline 9 for recycling.

[0092] In some embodiments of the present application, the flow rate of the combustion-supporting gas obtained by mixing the flue gas and pure oxygen in the combustion-supporting gas pipeline 5 is 100%.

[0093] The flow rate of the combustion-supporting gas in the driving air duct 8 is 18% to 23%;

[0094] The flow rate of the combustion-supporting gas in the self-suction air duct 6 under the kiln is 35% to 39%;

[0095] The flow rate of the oxidizing gas inputted into the cooling air inlet of the lower inner sleeve from the other end of the oxidizing gas pipeline 5 is 40% to 45%.

[0096] The beneficial effect of distributing the combustion-supporting gas in the above manner is that the efficiency of lime production can basically reach the level when air is used as the combustion-supporting gas, and at the same time the lower inner sleeve and the high-temperature lime can be effectively cooled.

[0097] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.

[0098] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0099] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present application specification, the terms "including", "comprising", etc. refer to "including but not limited to". Moreover, the terms "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "including..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. For the association relationship of more than three associated objects described by "and / or", it means that any one of these three associated objects can exist alone, or any at least two of them exist at the same time. For example, for A, and / or B, and / or C, it can be represented that any one of A, B, and C exists alone, or any two of them exist at the same time, or three of them exist at the same time. In this article, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one", "the following at least one (individual)" or similar expressions refer to any combination of these items, including any combination of single (individual) or plural (individual). For example, "at least one (individual) of a, b, or c", or "at least one (individual) of a, b, and c", can all represent: a, b, c, ab (i.e. a and b), ac, bc, or abc, wherein a, b, and c can be single or multiple, respectively.

[0100] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An oxygen-enriched combustion carbon capture system for a sleeve kiln, characterized in that: The oxygen-enriched combustion carbon capture system for a sleeve kiln comprises: A sleeve kiln, wherein an upper inner sleeve and a lower inner sleeve are arranged inside the sleeve kiln, and the sleeve kiln is provided with a kiln lower self-suction air inlet connected to the lower inner sleeve, a lower inner sleeve cooling air inlet, a lower inner sleeve cooling air outlet, and a lower inner sleeve fuel inlet, and the sleeve kiln is also provided with an upper inner sleeve fuel inlet connected to the upper inner sleeve, a flue gas outlet, an upper inner sleeve cooling air inlet, and an upper inner sleeve cooling air outlet; a flue gas treatment system, connected to the flue gas outlet; a flue gas collection system, the flue gas collection system being in communication with the flue gas treatment system; Pure oxygen pipeline; A combustion-supporting gas pipeline, the combustion-supporting gas pipeline is connected with the flue gas treatment system and the pure oxygen pipeline; A self-suction air duct under the kiln, one end of which is connected to the combustion-supporting gas duct, and the other end of which is connected to the self-suction air inlet under the kiln; a fuel pipeline, the fuel pipeline being in communication with both the lower inner sleeve fuel inlet and the upper inner sleeve fuel inlet; A driving air duct, one end of which is connected to the combustion-supporting gas duct, and the other end of which is connected to the fuel inlet of the lower inner sleeve; A lower inner sleeve cooling air input duct, wherein the lower inner sleeve cooling air input duct is connected to the lower inner sleeve cooling air inlet; A lower inner sleeve cooling air output duct, wherein the lower inner sleeve cooling air output duct is connected to the lower inner sleeve cooling air outlet; An upper inner sleeve cooling air input duct, the upper inner sleeve cooling air input duct being in communication with the upper inner sleeve cooling air inlet; The upper inner sleeve cooling air output pipeline is connected with the upper inner sleeve cooling air outlet.

2. The oxygen-enriched combustion carbon capture system for a sleeve kiln according to claim 1, characterized in that: The flue gas treatment system includes a heat exchanger, a first induced draft fan, a dust collector, and a first condenser which are connected in sequence according to the air flow direction, wherein the flue gas outlet and the first induced draft fan are connected through a heat medium channel of the heat exchanger.

3. The oxygen-enriched combustion carbon capture system for a sleeve kiln according to claim 1, characterized in that: The driving air duct is connected to the fuel inlet of the lower inner sleeve through the refrigerant channel of the heat exchanger.

4. The oxygen-enriched combustion carbon capture system for a sleeve kiln according to claim 1, characterized in that: The lower inner sleeve cooling air input pipeline is connected to the combustion-supporting gas pipeline, and the lower inner sleeve cooling air output pipeline is connected to the fuel pipeline.

5. The oxygen-enriched combustion carbon capture system for a sleeve kiln according to claim 4, characterized in that: The lower inner sleeve cooling air output pipeline is also connected to the lower inner sleeve cooling air input pipeline through the second condenser.

6. A method for capturing carbon from oxygen-enriched combustion in a sleeve kiln, characterized in that: The oxygen-enriched combustion carbon capture method for a sleeve kiln is implemented by the oxygen-enriched combustion carbon capture system for a sleeve kiln according to any one of claims 1 to 5, and the oxygen-enriched combustion carbon capture method for a sleeve kiln comprises the following steps: Outputting the smoke from the upper inner sleeve from the smoke outlet and introducing it into the smoke treatment system; The flue gas is processed by the flue gas processing system, and a part of the processed flue gas is input into the flue gas collection system, and the other part is input into the combustion-supporting gas pipeline; Inputting pure oxygen from the pure oxygen pipeline into the combustion-supporting gas pipeline, so that the flue gas and the pure oxygen are mixed in the combustion-supporting gas pipeline to obtain a combustion-supporting gas in which the volume proportion of oxygen is 30%; Input the combustion-supporting gas from the driving air duct into the fuel inlet of the lower inner sleeve, input the combustion-supporting gas through the self-suction air duct under the kiln into the self-suction air inlet under the kiln, and input the combustion-supporting gas from the other end of the combustion-supporting gas duct into the cooling air inlet of the lower inner sleeve; The fuel in the fuel pipeline is input into the lower inner sleeve fuel inlet and the upper inner sleeve fuel inlet, so that a combustion reaction occurs in the sleeve kiln and smoke is generated; Inputting the combustion-supporting gas from the lower inner sleeve cooling air input pipe into the lower inner sleeve cooling air inlet, cooling the lower inner sleeve, and then outputting the combustion-supporting gas from the lower inner sleeve cooling air output pipe; Air is input from the upper inner sleeve cooling air input duct to the upper inner sleeve cooling air inlet, and after cooling the upper inner sleeve, the air is discharged to the environment from the upper inner sleeve cooling air output duct.

7. The method for capturing carbon by oxygen-enriched combustion in a sleeve kiln according to claim 6, characterized in that: Part of the treated flue gas is input into the flue gas collection system, and the other part is input into the combustion-supporting gas pipeline, wherein the flow of the flue gas input into the combustion-supporting gas pipeline accounts for 60% to 64% of the flow of the treated flue gas.

8. The method for capturing carbon by oxygen-enriched combustion in a sleeve kiln according to claim 6, characterized in that: The flue gas treatment system comprises a heat exchanger, a first induced draft fan, a dust collector, and a first condenser which are connected in sequence according to the airflow direction, wherein the flue gas outlet and the first induced draft fan are connected through a heat medium channel of the heat exchanger, and the driving air duct is connected to the fuel inlet of the lower inner sleeve through a coolant channel of the heat exchanger. In the process of inputting the combustion-supporting gas from the driving air duct into the fuel inlet of the lower inner sleeve, the combustion-supporting gas is first input from the driving air duct into the refrigerant channel of the heat exchanger for heat exchange, and then the heat-exchanged combustion-supporting gas is input from the refrigerant channel of the heat exchanger into the fuel inlet of the lower inner sleeve.

9. The method for capturing carbon by oxygen-enriched combustion in a sleeve kiln according to claim 6, characterized in that: The lower inner sleeve cooling air input pipeline is connected to the combustion-supporting gas pipeline, the lower inner sleeve cooling air output pipeline is connected to the fuel pipeline, and the lower inner sleeve cooling air output pipeline is also connected to the lower inner sleeve cooling air input pipeline through a second condenser. The combustion-supporting gas is input from the lower inner sleeve cooling air input pipe to the lower inner sleeve cooling air inlet, and after cooling the lower inner sleeve, the combustion-supporting gas is output from the lower inner sleeve cooling air output pipe, including the following steps: The combustion-supporting gas is input from the combustion-supporting gas pipeline into the lower inner sleeve cooling air inlet via the lower inner sleeve cooling air input pipeline. After the combustion-supporting gas cools the lower inner sleeve and is output from the lower inner sleeve cooling air outlet, a part of the combustion-supporting gas is input into the fuel pipeline, and the other part is condensed by the second condenser and then input into the lower inner sleeve cooling air input pipeline for recycling.

10. The method for capturing carbon by oxygen-enriched combustion in a sleeve kiln according to claim 9, characterized in that: The flow rate of the combustion-supporting gas obtained by mixing the flue gas and pure oxygen in the combustion-supporting gas pipeline is 100%. The flow rate of the combustion-supporting gas in the driving air duct is 18% to 23%; The flow rate of the combustion-supporting gas in the self-suction air duct under the kiln is 35% to 39%; The flow rate of the oxidizing gas inputted into the cooling air inlet of the lower inner sleeve from the other end of the oxidizing gas pipeline is 40% to 45%.

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