Circulating flue gas treatment equipment

Abstract

The present invention relates to the technical field of fluid fuel combustion equipment, and discloses a circulating flue gas treatment equipment, including a shell, and a first jacket placed in the shell, and a rotating shaft that penetrates the first jacket and is rotatably connected to the shell; a first cavity is formed between the shell and the first jacket, and is connected to an exhaust gas inlet at one end of the first cavity, and an exhaust gas outlet is formed at the other end; a second cavity is formed between the first jacket and the rotating shaft, and is connected to a circulating flue gas inlet at one end of the second cavity, and a circulating flue gas outlet is formed at the other end; blades are formed on the rotating shaft to drive the exhaust gas to rotate; one end of the rotating shaft extends to pass through the first jacket, and a third cavity is formed in the rotating shaft, and is connected to an air inlet at one end of the third cavity, and an air outlet is formed at the other end. The circulating flue gas treatment equipment disclosed in the present invention has the technical effect of avoiding high local oxygen concentration and further reducing the amount of nitrogen oxides generated.

Description

Technical Field

[0001] The invention relates to the technical field of fluid fuel combustion equipment, in particular to circulating flue gas processing equipment. Background Art

[0002] As a byproduct of modern industrial development, industrial waste gas has a wide range of sources. In the oil refining process and the production and use of energy, such as traditional thermal power generation relying on the burning of coal, the burning of fossil fuels such as oil used to generate electricity, a large amount of waste gas will be emitted into the air during this process.

[0003] The composition of industrial waste gas is extremely complex. For example, city gas, biogas, calcium carbide furnace exhaust gas, carbon black exhaust gas, coke oven raw gas, blast furnace gas, etc. These industrial waste gases contain a large amount of combustible gases such as hydrogen, carbon monoxide and methane, as well as a large amount of non-combustible gases such as nitrogen and nitrogen oxides. If they are directly burned and discharged, it will cause great energy waste and environmental pollution.

[0004] Based on the above defects, the prior art proposes to burn the combustible gas and recover the heat energy through the combustion method, and at the same time adopt the flue gas circulation and re-combustion method to suppress the formation of nitrogen oxides. The specific method is to return a part of the exhaust gas to the air supply system to reduce the oxygen concentration in the mixture of the exhaust gas and the combustion-supporting gas, play a role in heat absorption, and prevent the combustion temperature from being too high, thereby suppressing the formation of nitrogen oxides.

[0005] Based on the above method, a circulating flue gas treatment device for waste gas combustion was developed. The existing circulating flue gas treatment device sends waste gas, circulating flue gas and air into the furnace cavity through different pipelines respectively, and at the output position of each gas, the circulating flue gas isolates the waste gas and air to slow down the contact speed between the waste gas and the air, thereby achieving delayed combustion, prolonging the combustion process, reducing the combustion temperature, preventing the generation of nitrogen oxides, and achieving low-nitrogen environmentally friendly emissions.

[0006] However, the existing circulating flue gas treatment device also has defects:

[0007] The essence of the flue gas recirculation and reburning method is to reduce the oxygen concentration in the mixed gas of exhaust gas and air, that is, to mix the circulating flue gas with the mixer. However, in the prior art, the circulating flue gas discharged through the pipeline still needs a process to be mixed with the mixed gas. Therefore, in the unmixed stage, the oxygen concentration is high or low, and nitrogen oxides are easily generated at locations with higher oxygen concentrations. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a circulating flue gas treatment device, in which it is proposed that: the waste gas and air are still separated by circulating flue gas, the contact speed between the waste gas and the air is slowed down, and kinetic energy is provided to the circulating flue gas at the same time, so that the kinetic energy is used to quickly mix with the waste gas when it is discharged, first reducing the oxygen concentration in the waste gas, and then mixing with the air, continuously reducing the oxygen concentration in the mixed gas, so as to avoid high local oxygen concentration and further reduce the generation of nitrogen oxides.

[0009] The circulating flue gas treatment device according to the present invention comprises a housing, and a first jacket disposed in the housing, and a rotating shaft penetrating the first jacket and rotatably connected to the housing;

[0010] A first cavity is formed between the shell and the first jacket, and an exhaust gas inlet is connected to one end of the first cavity, and an exhaust gas outlet is formed at the other end;

[0011] A second cavity is formed between the first jacket and the rotating shaft, and a circulating flue gas inlet is connected to one end of the second cavity, and a circulating flue gas outlet is formed at the other end; blades are formed on the rotating shaft to drive the exhaust gas to rotate;

[0012] One end of the rotating shaft extends to pass through the first jacket, and a third cavity is formed in the rotating shaft. One end of the third cavity is connected to an air inlet, and the other end forms an air outlet.

[0013] The purpose of such arrangement is: on the one hand, the first jacket is placed in the outer shell, and the first cavity formed between the two is annular, and correspondingly, the exhaust gas outlet is also annular, and at the same time, the rotating shaft is placed in the first jacket, and the second cavity formed between the two is also annular, and correspondingly, the circulating flue gas outlet is also annular, so that the exhaust gas and the circulating flue gas are both ejected at the annular outlet, and the ejected circulating flue gas is inside the exhaust gas, and in the early stage of each gas ejection, the exhaust gas and the air can be isolated in the entire circumferential direction. Compared with the traditional structure in which the circulating flue gas and the exhaust gas are both discharged through the pipe orifice, the isolation of this scheme is more comprehensive, and the inconsistent oxygen concentration is eliminated in the stage where the gas is not mixed evenly;

[0014] At the same time, it has the advantages of traditional equipment: in the early stage of each gas ejection, the exhaust gas and air are separated, the contact speed of the exhaust gas and air is slowed down, the delayed combustion is achieved, the combustion process is prolonged, and the generation of nitrogen oxides is prevented;

[0015] On the other hand, the blades arranged on the rotating shaft are utilized to provide kinetic energy for the circulating flue gas in the second cavity, so that the circulating flue gas has an impact effect on the exhaust gas when being discharged, and the circulating flue gas and the exhaust gas are quickly mixed, firstly reducing the oxygen concentration in the exhaust gas, and then, when meeting the air, continuing to have an impact effect on the air, quickly mixing the air, further reducing the oxygen concentration in the mixed gas, making the oxygen content in the mixed gas relatively uniform, thereby further reducing the generation of nitrogen oxides.

[0016] In some examples of the present invention, a baffle is provided at the circulating flue gas outlet, and the baffle is used to guide the circulating flue gas to be discharged in a direction close to the exhaust gas outlet.

[0017] The purpose of this arrangement is that the circulating flue gas with power is ejected in a direction deviating from the axis of the equipment under the action of the baffle, so that the gases injected into the furnace cavity are diffused in a direction deviating from the axis, avoiding concentrated combustion of the gas and causing excessive center temperature.

[0018] In some examples of the present invention, the baffle is in an umbrella-shaped structure, which is sleeved and connected to the rotating shaft, and the back side of the umbrella-shaped structure faces the circulating smoke outlet.

[0019] In some examples of the present invention, a rotating bracket is provided in the second cavity, and the rotating bracket includes an annular frame and a bearing connected to the inner side of the annular frame, the outer side of the annular frame is connected to the inner wall of the first jacket, and the inner side of the bearing is connected to the rotating shaft.

[0020] The purpose of setting the rotating bracket is to support the rotating shaft in the first jacket through the rotating bracket, and at the same time ensure that the rotating shaft can rotate through the action of the bearing.

[0021] In some examples of the present invention, a first through hole is formed on the annular frame for circulating smoke to pass through;

[0022] The purpose of such arrangement is that the rotating bracket itself is not sealed, and the circulating smoke can pass through, but the first through hole is provided to allow the smoke to pass through smoothly.

[0023] In some examples of the present invention, a second jacket is provided in the rotating shaft, dividing the third cavity to form a fourth cavity. The fourth cavity is a cavity formed between the inner wall of the rotating shaft and the second jacket, and is connected to a flue gas treatment material inlet at one end of the fourth cavity and forms a flue gas treatment material outlet at the other end.

[0024] The purpose of such arrangement is to use the flue gas treatment material to treat the flue gas after combustion, decompose the nitrogen oxides in the flue gas and then discharge them.

[0025] In some examples of the present invention, the flue gas treatment material outlet is located at an end of the air outlet away from the circulating flue gas outlet.

[0026] The purpose of such arrangement is to introduce the flue gas treatment material at the end of the flame so that it can quickly meet the flue gas after combustion and decompose the nitrogen oxides.

[0027] In some examples of the present invention, the other end of the rotating shaft extends to pass through the outer shell, and the flue gas treatment material inlet is arranged at this end of the rotating shaft. A first annular member is connected to the flue gas treatment material inlet pipe, and the first annular member is sleeved on the rotating shaft and corresponds to the flue gas treatment material inlet. When the rotating shaft rotates until the smoke gas treatment material inlet is connected to the smoke gas treatment material inlet pipe, the smoke gas treatment material can pass into the fourth cavity.

[0028] The purpose of such setting is that the rotating shaft needs to be driven by a power device to produce a rotation operation, and when rotating, the flue gas treatment material cannot pass into the fourth cavity through a simple pipeline. Therefore, a first ring-shaped member is provided to be connected to the rotating shaft, and a flue gas treatment material inlet is provided at a position on the rotating shaft corresponding to the first ring-shaped member. When the rotating shaft rotates until the flue gas treatment material inlet is connected to the flue gas treatment material inlet pipeline, the flue gas treatment material can enter the fourth cavity.

[0029] In some examples of the present invention, in order to increase the entry speed of the flue gas treatment material, multiple flue gas treatment material inlets may be opened and distributed along the circumference of the rotating shaft.

[0030] In some examples of the present invention, a first annular sealing ring is further provided between the first annular member and the rotating shaft, and a second through hole for the flue gas treatment material to pass through is formed on the first annular sealing ring at a position corresponding to the flue gas treatment material inlet pipe.

[0031] The purpose of such arrangement is that the smoke treatment material can easily escape from the gap between the first annular member and the rotating shaft, so the first annular sealing ring is arranged to prevent this phenomenon from happening.

[0032] In some examples of the present invention, an air inlet is also arranged at this end of the rotating shaft, and a second annular member is connected to the air inlet pipe, and the second annular member is sleeved on the rotating shaft. The air inlet passes through the fourth cavity and extends outside the rotating shaft, and corresponds to the second annular member, so that when the rotating shaft rotates until the air inlet is connected to the air inlet pipe, air can pass into the third cavity.

[0033] The purpose of such a setting is: to have the same function as the first ring-shaped member and the flue gas treatment material inlet pipe, that is, the rotation of the rotating shaft prevents the air from passing into the third cavity through a simple pipeline. Therefore, a second ring-shaped member is connected to the rotating shaft, and an air inlet is arranged at a position on the rotating shaft corresponding to the second ring-shaped member. When the rotating shaft rotates until the air inlet is connected to the air inlet pipe, the air can enter the third cavity.

[0034] In some examples of the present invention, in order to increase the air entry speed, multiple air inlets may be provided and distributed along the circumference of the rotating shaft.

[0035] A second annular sealing ring is also arranged between the second annular member and the rotating shaft, and a third through hole for air to pass through is formed at a position of the second annular sealing ring corresponding to the air inlet pipe.

[0036] The purpose of such arrangement is that the second annular sealing ring is used to prevent air from leaking from the gap between the second annular member and the rotating shaft.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a front view of a circulating flue gas processing device according to an embodiment of the present invention;

[0040] Figure 2 A partial cross-sectional view of a circulating flue gas processing device according to an embodiment of the present invention;

[0041] Figure 3 Schematic diagram of the shape of the exhaust gas ejected through the exhaust gas outlet in an embodiment of the present invention;

[0042] Figure 4 Schematic diagram of the shape of smoke ejected from the circulating smoke outlet in an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of the shape of the mixed gas after the exhaust gas and the flue gas meet in an embodiment of the present invention;

[0044] Figure 6 It is a front view of the rotating bracket in the embodiment of the present invention;

[0045] Figure 7 is a cross-sectional view of a rotating shaft in an embodiment of the present invention;

[0046] Figure 8 It is a front view of the circulating flue gas processing equipment in an embodiment of the present invention.

[0047] Description of reference numerals:

[0048] Shell 1, cover plate 11, sealing gasket 12;

[0049] The first jacket 2;

[0050] Rotating shaft 3, blades 31, baffle 32;

[0051] Rotating bracket 4, annular frame 41, bearing 42, first through hole 411;

[0052] The second jacket 5;

[0053] Ignition device 6, ignition tube 61, ignition and flame nozzle 62;

[0054] A first cavity a, an exhaust gas inlet a1, an exhaust gas outlet a2, and an exhaust gas inlet pipe a3;

[0055] The second chamber b has a circulating smoke inlet b1, a circulating smoke outlet b2, and a circulating smoke inlet pipe b3;

[0056] A third cavity c, an air inlet c1, an air outlet c2, an air inlet pipe c3, a second annular member c4, a second annular sealing ring c5, and a third through hole c51;

[0057] The fourth cavity d, the smoke treatment material inlet d1, the smoke treatment material outlet d2, the smoke treatment material inlet pipe d3, the first annular member d4, the first annular sealing ring d5, and the second through hole d51. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0062] Reference below Figure 1 to Figure 8 The figure shows a circulating flue gas processing device provided by an embodiment of the present invention.

[0063] For details, please see the attached Figure 1 , is a front view of a circulating flue gas treatment device, the treatment device comprises a housing 1, the housing 1 is a cylindrical structure, a cavity is formed inside the housing, one end is open, and the other end is closed by a cover plate 11;

[0064] Please see attached Figure 2 , which is a cross-sectional view of a circulating flue gas treatment device. The treatment device also includes a first jacket 2 placed in the outer shell. The first jacket 2 is also a cylindrical structure, coaxially arranged with the outer shell 1, and a cavity is formed inside it. One end of the first jacket 2 is also open, and the end extends to correspond to the open end of the outer shell 1, and the other end extends to the cover plate 11 and is also closed by the cover plate 11.

[0065] Please continue to see the attached Figure 2 A space is formed between the inner wall of the outer shell 1 and the outer wall of the first jacket 2. The space is an annular space, which serves as a first cavity a for transporting waste gas. The first cavity a has a waste gas inlet a1 at one end close to the cover plate 11 and on the outer shell 1, and the open end of the first cavity a is a waste gas outlet a2.

[0066] Please continue to see the attached Figure 2 , an exhaust gas inlet pipe a3 is provided on the outside of the housing 1 at a position corresponding to the exhaust gas inlet a1, so that the exhaust gas can enter the first cavity a through the exhaust gas inlet pipe a3 and be ejected at the exhaust gas outlet a2;

[0067] For details, please see the attached Figure 3 , is a schematic diagram of the shape of the exhaust gas ejected through the exhaust gas outlet a2, and the shape M of the exhaust gas after ejection is ring-shaped.

[0068] Please continue to see the attached Figure 1 ~Attached Figure 2 A rotating shaft 3 is also disposed in the first jacket 2. The rotating shaft 3 is coaxially disposed with the first jacket 2, passes through the first jacket 2, and both ends extend to the outside of the first jacket 2;

[0069] Specifically, one end of the rotating shaft 3 passes through the cover plate 11, and a sealing gasket 12 is further provided on the outside of the cover plate 11 to seal the gap between the rotating shaft 3 and the cover plate 11. In order to prevent the sealing gasket 12 from shifting, a pressure plate may also be provided on the side of the sealing gasket 12 away from the cover plate 11;

[0070] The other end of the rotating shaft 3 misses the open end of the first jacket 2 and extends a certain distance.

[0071] Please continue to see the attached Figure 2 An annular space is also formed between the inner wall of the first jacket 2 and the outer wall of the rotating shaft 3, and the space is the second cavity b, which is used to transport the circulating flue gas. The second cavity b is close to one end of the cover plate 11, and a circulating flue gas inlet b1 is opened on the first jacket 2, and the open end of the second cavity b is the circulating flue gas outlet b2.

[0072] Please continue to see the attached Figure 2 A circulating smoke inlet pipe b3 is provided on the outside of the housing 1 at a position corresponding to the circulating smoke inlet b1, and the circulating smoke inlet pipe b3 extends to penetrate the first cavity a and is connected to the circulating smoke inlet b1, so that the circulating smoke can enter the second cavity b through the circulating smoke inlet pipe b3 and be ejected at the circulating smoke outlet b2;

[0073] Please continue to see the attached Figure 2 A plurality of blades 31 are arranged in the second cavity b. The blades 31 are connected to the rotating shaft 3, distributed along the circumference of the rotating shaft 3, and close to the circulating flue gas outlet b2. When the rotating shaft 3 is rotated by external force, the blades 31 are driven to rotate. The circulating flue gas obtains centrifugal force under the action of the blades 31, so that the ejected circulating flue gas presents an umbrella shape.

[0074] Please continue to see the attached Figure 2 The circulating flue gas outlet b2 is provided with a baffle 32, which is an umbrella-shaped structure, sleeved and connected to the rotating shaft 3, and the back of the umbrella-shaped structure faces the circulating flue gas outlet b2. The baffle 32 is used to guide the circulating flue gas to be discharged in a direction close to the exhaust gas outlet;

[0075] The back side of the umbrella-shaped structure refers to the side away from the concave side, which is adapted to the annular circulating smoke outlet b2;

[0076] Therefore, please see the attached Figure 4 , is a schematic diagram of the shape of the smoke ejected from the circulating smoke outlet b2. The shape N of the smoke after ejection is a ring-shaped umbrella.

[0077] Please see attached Figure 5 , which is a schematic diagram of the shape of the mixed gas after the exhaust gas and the flue gas meet. When the exhaust gas is affected by the power of the flue gas, it is quickly impacted and mixed, and the shape G of the resulting mixed gas is larger and also an annular umbrella shape.

[0078] Under the impact, the oxygen concentration in the exhaust gas can be rapidly reduced, and the oxygen concentration in the mixed gas is uniform, thus avoiding the generation of nitrogen oxides at high oxygen concentrations due to uneven oxygen concentration, and the amount of nitrogen oxides generated is smaller.

[0079] Please continue to see the attached Figure 2 The second cavity b has a rotating bracket 4, which includes an annular frame 41 and a bearing 42 connected to the inner side of the annular frame 41. The outer side of the annular frame 41 is connected to the inner wall of the first jacket 2, and the inner side of the bearing 42 is connected to the rotating shaft 3. The purpose of such a setting is to form a supporting effect on the rotating shaft 3 so that it can be rotatably set in the first jacket 2, and the bearing 42 assists the rotation of the rotating shaft 3.

[0080] For details, please see the attached Figure 6 , which is a front view of the rotating bracket 4, wherein a plurality of first through holes 411 for circulating flue gas to pass through are formed on the annular bracket 41, so that the rotating bracket 4 can realize the supporting function while allowing the circulating flue gas to pass through.

[0081] Please see attached Figure 2 and attached Figure 7 , attached Figure 7 is a cross-sectional view of the rotating shaft 3. The rotating shaft 3 is a hollow rotating shaft, and has a cylindrical cavity inside. Both ends of the cylindrical cavity are closed, serving as a third cavity c for transporting combustion-supporting gas, i.e., air. The third cavity c extends along the rotating shaft 3, and one end thereof extends to miss the cover plate 11, and continues to extend for a distance in the direction away from the cover plate 11, and the other end extends to miss the circulating flue gas outlet b2, and continues to extend for a distance in the direction away from the circulating flue gas outlet b2. The air inlet c1 is arranged at one end of the rotating shaft 3 away from the cover plate 11, and the air outlet c2 is arranged at one end of the rotating shaft 3 away from the circulating flue gas outlet b2, and there are a plurality of air outlets c2 distributed along the circumference of the rotating shaft 3;

[0082] In this way, when the air is ejected from the air outlet c2, the mixture of flue gas and exhaust gas has undergone the first rapid mixing and continues to carry power, so it can also quickly mix with the air to continue to reduce the oxygen concentration in the air, and the mixture formed by the mixture of the three diffuses in the direction away from the central axis.

[0083] Please continue to see the attached Figure 7The rotating shaft 3 has a second jacket 5, which is also a cylindrical structure. Both ends extend to be flush with the end surface of the rotating shaft 3 and are coaxially arranged with the rotating shaft 3. The third cavity c is divided to form a fourth cavity d. The fourth cavity d is specifically the space formed between the inner wall of the rotating shaft 3 and the outer wall of the second jacket 5, and the third cavity c is the space inside the second jacket 5.

[0084] The fourth cavity d is specifically used to transport flue gas treatment materials, which are ammonia or ammonia water, as well as urea and catalyst solution, which are used to mix and react with the flue gas after combustion, that is, the nitrogen oxides in the flue gas react with ammonia to convert the nitrogen oxides into nitrogen and water for direct discharge, thereby further reducing the emission of nitrogen oxides.

[0085] Please continue to see the attached Figure 7 The flue gas treatment material inlet d1 is also arranged on the end of the rotating shaft 3 away from the cover plate 11, and the flue gas treatment material outlet d2 is arranged on the end of the rotating shaft 3 away from the circulating flue gas outlet b2, and the flue gas treatment material outlet d2 is located at the end of the air outlet c2 away from the circulating flue gas outlet b2. There are also several flue gas treatment material outlets d2 distributed along the circumference of the rotating shaft 3. The purpose is to make the flue gas treatment material spray at the end of the flame to facilitate the reaction with nitrogen oxides.

[0086] Please continue to see the attached Figure 7 A first annular member d4 is connected to the flue gas treatment material inlet pipe d3, and the first annular member d4 is sleeved on the rotating shaft 3 and corresponds to the flue gas treatment material inlet d1. When the rotating shaft 3 rotates until the flue gas treatment material inlet d1 is connected to the flue gas treatment material inlet pipe d3, the flue gas treatment material can pass into the fourth cavity d and be discharged through the flue gas treatment material outlet d2.

[0087] Please continue to see the attached Figure 7 A first annular sealing ring d5 is also provided between the first annular member d4 and the rotating shaft 3. A second through hole d51 for the flue gas treatment material to pass through is formed on the first annular sealing ring d5 at a position corresponding to the flue gas treatment material inlet pipe d3.

[0088] Please continue to see the attached Figure 7 The air inlet pipe c3 is connected with a second annular member c4, which is sleeved on the rotating shaft 3. The air inlet c1 passes through the fourth cavity d and extends outside the rotating shaft 3, and corresponds to the second annular member c4. When the rotating shaft 3 rotates until the air inlet c1 is connected with the air inlet pipe c3, air can flow into the third cavity c;

[0089] Please continue to see the attached Figure 7 A second annular sealing ring c5 is also provided between the second annular member c4 and the rotating shaft 3. A third through hole c51 for air to pass through is formed on the second annular sealing ring c5 at a position corresponding to the air inlet pipe c3.

[0090] Please continue to see the attached Figure 8 , which is a front view of the circulating flue gas processing equipment, the processing equipment is also provided with an ignition device 6, the ignition device 6 includes an ignition tube 61 arranged in the shell 1, the ignition tube 61 extends into the furnace cavity, and is provided with an ignition and flame nozzle 62.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A circulating flue gas treatment device, characterized in that: It comprises a shell, and a first jacket disposed in the shell, and a rotating shaft penetrating the first jacket and rotatably connected to the shell; A first cavity is formed between the shell and the first jacket, and one end of the first cavity is connected to an exhaust gas inlet, and the other end forms an exhaust gas outlet; A second cavity is formed between the first jacket and the rotating shaft, and a circulating flue gas inlet is connected to one end of the second cavity, and a circulating flue gas outlet is formed at the other end; blades are formed on the rotating shaft to drive the exhaust gas to rotate; One end of the rotating shaft extends to pass through the first jacket, and a third cavity is formed in the rotating shaft, and one end of the third cavity is connected to an air inlet, and the other end forms an air outlet; The circulating smoke outlet is provided with a baffle, and the baffle is used to guide the circulating smoke to be discharged in a direction close to the exhaust gas outlet.

2. The circulating flue gas treatment equipment according to claim 1, characterized in that: The baffle is in an umbrella-shaped structure, which is sleeved on and connected to the rotating shaft, and the back side of the umbrella-shaped structure faces the circulating smoke outlet.

3. The circulating flue gas treatment equipment according to claim 1 or 2, characterized in that: The second cavity has a rotating bracket, which includes an annular bracket and a bearing connected to the inner side of the annular bracket. The outer side of the annular bracket is connected to the inner wall of the first jacket, and the inner side of the bearing is connected to the rotating shaft.

4. The circulating flue gas treatment equipment according to claim 3, characterized in that: The annular frame is formed with a first through hole for circulating smoke to pass through.

5. The circulating flue gas treatment equipment according to claim 1 or 2, characterized in that: The rotating shaft has a second jacket inside, which divides the third cavity to form a fourth cavity. The fourth cavity is a cavity formed between the inner wall of the rotating shaft and the second jacket, and one end of the fourth cavity is connected to the flue gas treatment material inlet, and the other end forms a flue gas treatment material outlet.

6. The circulating flue gas treatment equipment according to claim 5, characterized in that: The flue gas treatment material outlet is located at an end of the air outlet away from the circulating flue gas outlet.

7. The circulating flue gas treatment equipment according to claim 5, characterized in that: The other end of the rotating shaft extends to pass through the outer shell, and the flue gas treatment material inlet is arranged at this end of the rotating shaft. A first annular member is connected to the flue gas treatment material inlet pipe. The first annular member is sleeved on the rotating shaft and corresponds to the flue gas treatment material inlet. When the rotating shaft is rotated until the flue gas treatment material inlet is connected to the flue gas treatment material inlet pipe, the flue gas treatment material can pass into the fourth cavity.

8. The circulating flue gas treatment equipment according to claim 7, characterized in that: A first annular sealing ring is also provided between the first annular member and the rotating shaft, and a second through hole for the flue gas treatment material to pass through is formed on the first annular sealing ring at a position corresponding to the flue gas treatment material inlet pipe.

9. The circulating flue gas treatment equipment according to claim 7, characterized in that: The air inlet is also arranged at the end of the rotating shaft, and a second annular member is connected to the air inlet pipe, and the second annular member is sleeved on the rotating shaft. The air inlet passes through the fourth cavity and extends to the outside of the rotating shaft, and corresponds to the second annular member, so that when the rotating shaft rotates until the air inlet is connected to the air inlet pipe, air can flow into the third cavity; A second annular sealing ring is also arranged between the second annular member and the rotating shaft, and a third through hole for air to pass through is formed at a position of the second annular sealing ring corresponding to the air inlet pipe.

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