Integrated purification and emission process and device for multiple pollutants in oxygen-enriched combustion tail gas

Abstract

The invention discloses an oxygen-enriched combustion tail gas multi-pollutant integrated purification and emission process and device, and particularly relates to the field of tail gas purification, the device comprises a cooling tower, a tail gas dryer and a purification box, a first gas conveying pipe is inserted in the side wall of the cooling tower, and the cooling tower and the tail gas dryer are connected through a second gas conveying pipe; the tail gas dryer is connected with the purifying box through a third gas conveying pipe, a plurality of sets of filtering pieces are transversely arranged in the purifying box, and recycling pieces for recycling activated carbon particles are arranged below the filtering pieces; through treatment by the cooling tower and the tail gas dryer, the temperature and humidity of the tail gas are reduced, the adsorption efficiency of the activated carbon to pollutants such as volatile organic compounds is improved, the pollutant concentration is further reduced, stable up-to-standard emission is ensured, meanwhile, quick replacement of the activated carbon is realized through automatic mechanical control, the compactness and adsorption uniformity are ensured, and the service life of the activated carbon is prolonged. A closed-loop management mechanism reduces waste, accelerates regeneration speed and improves resource utilization rate.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas purification technology, and more specifically, to an integrated purification and emission process and device for multiple pollutants in oxygen-enriched combustion exhaust gas. Background Technology

[0002] With the widespread application of oxy-fuel combustion technology, the environmental pollution caused by its exhaust emissions has attracted increasing attention. Oxy-fuel combustion exhaust gases typically contain volatile organic compounds, particulate matter, and various gaseous pollutants. If these pollutants are emitted directly without effective treatment, they will cause serious damage to the atmospheric environment and endanger human health. According to patent document CN115307146B, an integrated purification device for multiple pollutants in exhaust gases coupled with oxy-fuel combustion is proposed. This device mixes waste with oxygen-enriched gas in the combustion chamber and performs complete combustion. After catalytic combustion and gas-solid separation, the gaseous pollutants are catalytically decomposed in a corona atmosphere, achieving both complete waste combustion and efficient exhaust gas purification. The aforementioned patent document states that although oxygen-enriched combustion and catalytic cracking processes can decompose most organic pollutants, trace amounts of volatile organic compounds or small molecule organic compounds may still remain in the exhaust gas. Therefore, purification equipment can be added, and activated carbon can be used to efficiently adsorb these substances by utilizing its high specific surface area and microporous structure, thereby further reducing the toxicity of the exhaust gas. However, activated carbon will gradually reach saturation and become inactive after adsorbing pollutants for a period of time, and needs to be replaced in a timely manner. Traditional activated carbon replacement methods are cumbersome and inefficient. During the recycling process, it is difficult to effectively separate unagglomerated and agglomerated particles, resulting in low resource utilization and slow regeneration speed. It is impossible to accelerate the regeneration speed through dispersion pretreatment. In addition, it is difficult to ensure the filling density of the replaced activated carbon in the pore barrel. To address the above technical defects, a solution is provided. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides an integrated purification and emission process and device for multiple pollutants in oxygen-enriched combustion exhaust gas.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas includes a cooling tower, an exhaust gas dryer, and a purification chamber. A gas supply pipe is inserted into the side wall of the cooling tower. The cooling tower and the exhaust gas dryer are connected by a second gas supply pipe. The exhaust gas dryer and the purification chamber are connected by a third gas supply pipe. Multiple sets of filter elements are arranged horizontally inside the purification chamber. A recovery element for recovering activated carbon particles is provided below the filter elements. The filter element includes a filter barrel, inside which a porous barrel is installed. A hollow spiral shaft is provided at the center of the porous barrel. One end of the spiral shaft extends to the outside of the filter barrel and is rotatably engaged with the purification box. The other end of the spiral shaft extends to the outside of the filter barrel and is rotatably provided with a connecting sleeve, which is fixedly installed on the purification box. The outer wall of the spiral shaft inside the filter barrel has a mesh structure, and a spiral auger is fixedly provided on the outer wall of the spiral shaft inside the porous barrel. An active particle discharge pipe is vertically inserted into the lower left of the vented barrel, and the end of the active particle discharge pipe extends to the bottom of the filter barrel. A particle discharge control valve is provided above the active particle discharge pipe. An active particle feed pipe is inserted into the side wall of the vented barrel away from the active particle discharge pipe. A filter barrel exhaust pipe is vertically inserted above the filter barrel.

[0005] Furthermore, the recycling component includes a receiving inclined pipe connected to the activated particle discharge pipe, a recycling bin connected to the output side of the receiving inclined pipe, a screening plate that is inclined inside the recycling bin and docks with the receiving inclined pipe, an inner clamping plate that is inclined inside the recycling bin and docks with the bottom of the screening plate, an outer clamping plate that is inclined inside the recycling bin and parallel to the inner clamping plate, and a dispersing rod for dispersing agglomerated activated carbon particles is alternately arranged between the inner and outer clamping plates.

[0006] Furthermore, the recycling bin is provided with a collection outlet at the bottom, and the inside of the recycling bin is inclined upward from the side near the collection outlet to the side away from the collection outlet.

[0007] Furthermore, the connecting sleeve is also provided with a receiving pipe, and the receiving pipe is provided with a control valve. Multiple sets of the receiving pipes are connected together by a T-shaped pipe, and the T-shaped pipe is connected to the conveying pipe.

[0008] Furthermore, the input end of the active particle feed pipe is connected to a storage tank, and the storage tank is connected to a purification box. A feed control valve is provided on the outer wall of the active particle feed pipe.

[0009] Furthermore, a driven gear is provided on the outer wall of one set of the spiral shaft ends, and a drive gear that cooperates with the driven gear is provided on the outer wall of the purification box. The two adjacent sets of spiral shafts are connected by a transmission component.

[0010] One of the processes for integrated purification and emission control of multiple pollutants in oxygen-enriched combustion exhaust gas includes the following steps: Cooling and drying: The treated exhaust gas enters the cooling tower and exhaust gas dryer for cooling and drying treatment. Activated carbon purification: It enters the receiving pipe through the T-shaped pipe, then enters the spiral shaft, passes through the pores to the pore bucket, is purified by activated carbon particles, and is discharged from the filter bucket exhaust pipe, and finally discharged through the tail gas exhaust pipe. Activated carbon replacement: When activated carbon is deactivated, the control drive gear drives the internal spiral shaft of the driven gear to rotate, opening the particle discharge control valve above the activated particle discharge pipe. The spiral shaft is driven by the spiral auger to discharge activated carbon particles. Activated carbon screening and recovery: The discharged activated carbon passes through the receiving inclined tube to the screening plate. Unagglomerated activated carbon is screened into the recovery bucket, while agglomerated activated carbon enters between the inner and outer plates. After being dispersed by the dispersing rod, it falls to the bottom of the recovery bucket and is discharged through the collection outlet for recycling. Filling with new activated carbon: After emptying, open the feed control valve at the bottom of the storage tank. The activated carbon granules enter the vented tank through the activated carbon granule feed pipe, and the vented tank is filled with the rotating screw conveyor.

[0011] The technical effects and advantages of this invention are as follows: 1. The present invention treats the exhaust gas after it has been cooled by a cooling tower and exhaust gas dryer. The temperature and humidity are significantly reduced, which reduces the negative impact of high temperature and high humidity environment on the adsorption performance of activated carbon. This greatly improves the adsorption efficiency of activated carbon for volatile organic compounds, particulate matter and gaseous pollutants. After the exhaust gas is deeply purified by activated carbon particles in the gas pore barrel, the pollutant concentration is further reduced. Finally, when the exhaust gas is discharged through the filter barrel and exhaust gas emission pipe, the multi-stage treatment mode ensures that the exhaust gas is stably discharged in compliance with standards.

[0012] 2. This invention achieves rapid replacement of activated carbon through automated mechanical control: When activated carbon is deactivated, the drive gear drives the screw shaft and auger to completely empty the deactivated particles. New activated carbon is uniformly filled through the feed control valve and screw conveyor, ensuring the density and uniformity of the particles in the pore barrel. In the recycling process, the combination design of the screening plate and the dispersing rod enables the direct recycling of non-agglomerated particles and the mechanical deagglomeration of agglomerated particles, significantly improving resource utilization. This closed-loop management mechanism not only reduces the waste of activated carbon, but also accelerates the regeneration speed through dispersion pretreatment. Attached Figure Description

[0013] Figure 1 This is a perspective view of the overall structure of the present invention.

[0014] Figure 2 This is a three-dimensional view of the external structure of the purification box in this invention.

[0015] Figure 3 This is a three-dimensional view of the internal structure of the purification box in this invention.

[0016] Figure 4 This is a perspective view showing the connection relationship between the filter bucket and the recycling bucket in this invention.

[0017] Figure 5 This is a three-dimensional view of the internal structure of the filter barrel in this invention.

[0018] Figure 6 This is a three-dimensional view of the internal structure of the recycling bin in this invention.

[0019] Figure 7 This is a magnified schematic diagram of the structure of region A.

[0020] The attached diagram is labeled as follows: 01, Gas Pipeline 1; 02, Gas Pipeline 2; 03, Delivery Pipeline 3; 1. Cooling tower; 2. Exhaust gas dryer; 3. Purification box; 4. Filter element; 5. Storage tank; 6. Recycling component; 7. Exhaust gas discharge pipe; 41. Filter barrel; 42. Spiral shaft; 43. Connecting sleeve; 44. Porous barrel; 45. Spiral auger; 46. Filter barrel exhaust pipe; 47. Activated particle discharge pipe; 48. Activated particle feed pipe; 61. Recycling tank; 62. Feeding inclined pipe; 63. Screening plate; 64. Inner clamping plate; 65. Outer clamping plate; 66. Dispersing rod; 67. Collection outlet; 81. T-shaped pipe; 82. Receiving pipe; 83. Inlet control valve; 91. Drive gear; 92. Driven gear; 93. Transmission component. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1-7 As shown, the following solutions can be used to address the problems of cumbersome and inefficient operation of the existing activated carbon replacement method in purification equipment, as well as the difficulty in ensuring the compactness of the replaced activated carbon in the pore bucket. This embodiment of an integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas includes a cooling tower 1, an exhaust gas dryer 2, and a purification box 3. A gas supply pipe 1 01 is inserted into the side wall of the cooling tower 1. The cooling tower 1 and the exhaust gas dryer 2 are connected by a gas supply pipe 2 02. The exhaust gas dryer 2 and the purification box 3 are connected by a gas supply pipe 3. Multiple sets of filter elements 4 are arranged horizontally inside the purification box 3. A recovery element 6 for recovering activated carbon particles is provided below the filter elements 4. It should be noted that the exhaust gas entering the cooling tower 1 first undergoes full combustion and catalytic combustion with oxygen enrichment to reduce the generation of harmful substances; then solid pollutants are removed through gas-solid separation; then it undergoes catalytic cracking in a corona atmosphere; finally, it is further purified by a cracking catalyst and then discharged after being collected at high temperature. Cooling tower 1 is a prior art device for cooling exhaust gas; exhaust gas dryer 2 is a prior art device for drying exhaust gas. The filter element 4 includes a filter barrel 41, inside which a perforated barrel 44 is installed. A hollow spiral shaft 42 is provided at the center of the perforated barrel 44. One end of the spiral shaft 42 extends to the outside of the filter barrel 41 and is rotatably engaged with the purification box 3. The other end of the spiral shaft 42 extends to the outside of the filter barrel 41 and is rotatably provided with a connecting sleeve 43. The connecting sleeve 43 is fixedly installed on the purification box 3. The outer wall of the spiral shaft 42 inside the filter barrel 41 has a mesh structure. A spiral auger 45 is fixedly provided on the outer wall of the spiral shaft 42 inside the perforated barrel 44. An active particle discharge pipe 47 is vertically inserted at the lower left of the vent barrel 44, and the end of the active particle discharge pipe 47 extends to the bottom of the filter barrel 41. A particle discharge control valve is provided above the active particle discharge pipe 47. An active particle feed pipe 48 is inserted on the side wall of the vent barrel 44 away from the active particle discharge pipe 47. A filter barrel exhaust pipe 46 is vertically inserted above the filter barrel 41. It should be explained here that activated carbon particles are filled between the pore barrel 44 and the spiral shaft 42. In this embodiment, the specific steps for "filling the pore barrel 44" are as follows: After the deactivated activated carbon particles in the pore barrel 44 are completely emptied, the feed control valve below the storage tank 5 is opened. At this time, the new activated carbon particles in the storage tank 5 flow into the pore barrel 44 through the activated carbon particle feed pipe under the action of gravity. The pore barrel 44 is equipped with a spiral auger 45, driven by a spiral shaft 42. When the new activated carbon particles enter the pore barrel 44, the rotating spiral auger 45 pushes the activated carbon particles from the feed port into the pore barrel 44 through its spiral blades. This structure can ensure that the activated carbon is uniformly filled and avoid local accumulation or gaps. The continuous rotation of the spiral auger 45 causes the activated carbon particles to form a dynamic flow in the pore barrel 44. The particles squeeze each other and fill the gaps, eventually reaching a dense state. When the height of the activated carbon particles reaches the design capacity of the pore barrel 44, that is, when it is filled to the top or the designated position, the feed control valve is closed to complete the filling. Specifically, when replacing activated carbon granules, all activated carbon granules inside the purification box 3 can be replaced simultaneously, or they can be replaced selectively. A valve is provided at the connection between the exhaust pipe 7 and the filter exhaust pipe 46 to prevent reverse flow of gas, thus avoiding reverse flow of gas when selectively replacing activated carbon granules. The intended effect of this embodiment is: By linking the spiral auger 45 with the feed control valve, the new activated carbon is quickly and evenly filled, ensuring that the pore tank 44 is always in the best adsorption state and ensuring the continuous and stable operation of the exhaust gas purification system. The filling process of the new activated carbon is uniformly conveyed by the spiral auger 45, which ensures the density and adsorption uniformity of the activated carbon in the pore barrel 44, providing a stable guarantee for the next tail gas purification, thereby realizing the continuous and efficient operation of the entire purification system and low pollutant emissions. Example 2: Please refer to Figures 1-6 As shown, the following solutions can be used to address the problem of low resource utilization and slow regeneration speed caused by the difficulty in effectively separating unagglomerated and agglomerated particles during the recycling process. The recycling component 6 includes a receiving inclined pipe 62 connected to the activated particle discharge pipe 47. A recycling bin 61 is connected to the output side of the receiving inclined pipe 62. A screening plate 63 is inclined inside the recycling bin 61 and docks with the receiving inclined pipe 62. An inner clamping plate 64 is also inclined inside the recycling bin 61 and docks with the bottom of the screening plate 63. An outer clamping plate 65 parallel to the inner clamping plate 64 is also inclined inside the recycling bin 61. A dispersing rod 66 for dispersing agglomerated activated carbon particles is alternately arranged between the inner clamping plate 64 and the outer clamping plate 65. The recycling bin 61 is provided with a collection outlet 67 at the bottom, and the inside of the recycling bin 61 is inclined upward from the side near the collection outlet 67 to the side away from the collection outlet 67. The connecting sleeve 43 is also provided with a receiving pipe 82, and the receiving pipe 82 is provided with an air intake control valve 83. Multiple sets of receiving pipes 82 are connected together by T-shaped pipes 81, and the T-shaped pipes 81 are connected to the conveying pipe 303. The input end of the active particle feed pipe 48 is connected to a storage tank 5, and the storage tank 5 is connected to the purification box 3. A feed control valve is provided on the outer wall of the active particle feed pipe 48. A driven gear 92 is provided on the outer wall of the end of a set of spiral shafts 42, and a drive gear 91 that cooperates with the driven gear 92 is provided on the outer wall of the purification box 3. Two adjacent sets of spiral shafts 42 are connected by a transmission component 93. It should be noted that: a drive shaft is provided at the center of the drive gear, and a motor is fixedly connected to the drive shaft on the purification box 3; the transmission component 93 includes two sets of transmission wheels, which are connected to the ends of their corresponding spiral shafts 42, and the two sets of transmission wheels are connected by a transmission belt. The intended effect of this embodiment is that deactivated activated carbon is rapidly recovered through mechanical discharge and screening dispersion treatment. Unagglomerated particles are directly recovered, and agglomerated particles are reused after dispersion, reducing resource waste and achieving efficient recovery and regeneration.

[0023] An integrated purification and emission process for multiple pollutants in oxygen-enriched combustion exhaust gas includes the following steps: The treated exhaust gas enters cooling tower 1 and exhaust gas dryer 2 for cooling and drying. Then, it enters each receiving pipe 82 through the T-shaped pipe 81, then enters the spiral shaft 42, enters the vent barrel 44 through the vent holes, is purified by activated carbon particles, and is discharged through the exhaust pipe of the filter barrel 41, and then discharged through the exhaust pipe 7. This can further improve the exhaust gas purification effect and ensure lower pollutant emissions. When activated carbon granules lose their activity after long-term use, the control drive gear 91 drives the spiral shaft 42 inside the driven gear 92 to rotate, and opens the particle discharge control valve above the activated carbon granule discharge pipe 47. The rotating spiral shaft 42, driven by the spiral auger 45, discharges the activated carbon granules inside through the activated carbon granule discharge pipe 47. The discharged activated carbon granules enter the screening plate 63 through the receiving inclined pipe 62. The screening plate 63 screens the non-agglomerated activated carbon granules into the recycling bin 61. The agglomerated activated carbon granule clumps enter between the inner clamping plate 64 and the outer clamping plate 65. Due to gravity, they fall down and are dispersed by the dispersing rod 66. After falling into the bottom of the recycling bin 61, they are discharged through the collection outlet 67 for recycling. This dispersion pretreatment of activated carbon granules accelerates the recycling process. After emptying, open the feed control valve below the storage tank 5. The activated carbon particles enter the pore tank 44 through the activated carbon particle feed pipe. The rotating auger 45 fills the pore tank 44 with activated carbon particles to prepare for the next operation. After filling is complete, stop the drive gear transmission.

[0024] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas, comprising a cooling tower (1), an exhaust gas dryer (2), and a purification chamber (3), wherein a gas supply pipe (01) is inserted into the side wall of the cooling tower (1), the cooling tower (1) and the exhaust gas dryer (2) are connected by a gas supply pipe (02), and the exhaust gas dryer (2) and the purification chamber (3) are connected by a gas supply pipe (3), characterized in that, The purification box (3) is provided with multiple sets of filter elements (4) arranged horizontally inside, and a recovery element (6) for recovering activated carbon particles is provided below the filter elements (4). The filter element (4) includes a filter barrel (41), a perforated barrel (44) is installed inside the filter barrel (41), a hollow spiral shaft (42) is provided at the center of the perforated barrel (44), one end of the spiral shaft (42) extends to the outside of the filter barrel (41) and is rotatably engaged with the purification box (3), the other end of the spiral shaft (42) extends to the outside of the filter barrel (41) and is rotatably provided with a connecting sleeve (43), and the connecting sleeve (43) is fixedly installed on the purification box (3). The outer wall of the spiral shaft (42) inside the filter barrel (41) has a mesh structure, and a spiral auger (45) is fixedly provided on the outer wall of the spiral shaft (42) inside the perforated barrel (44). An active particle discharge pipe (47) is vertically inserted into the lower left of the vent barrel (44), and the end of the active particle discharge pipe (47) extends to the bottom of the filter barrel (41). A particle discharge control valve is provided above the active particle discharge pipe (47). An active particle feed pipe (48) is inserted into the side wall of the vent barrel (44) away from the active particle discharge pipe (47). A filter barrel exhaust pipe (46) is vertically inserted above the filter barrel (41).

2. The integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas according to claim 1, characterized in that: The recycling component (6) includes a receiving inclined pipe (62) connected to the activated particle discharge pipe (47). A recycling bin (61) is connected to the output side of the receiving inclined pipe (62). A screening plate (63) that is inclined inside the recycling bin (61) and docks with the receiving inclined pipe (62) is also inclined inside the recycling bin (61) and docks with the bottom of the screening plate (63). An outer clamping plate (65) that is inclined inside the recycling bin (61) and parallel to the inner clamping plate (64) is also inclined inside the recycling bin (61). A dispersing rod (66) for dispersing agglomerated activated carbon particles is alternately arranged between the inner clamping plate (64) and the outer clamping plate (65).

3. The integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas according to claim 2, characterized in that: The recycling bin (61) is provided with a collection outlet (67) at the bottom, and the recycling bin (61) is inclined upward from the side near the collection outlet (67) to the side away from the collection outlet (67).

4. The integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas according to claim 3, characterized in that: The connecting sleeve (43) is also provided with a receiving pipe (82), and the receiving pipe (82) is provided with an air intake control valve (83). Multiple sets of the receiving pipes (82) are connected together by a T-shaped pipe (81), and the T-shaped pipe (81) is connected to the conveying pipe (03).

5. The integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas according to claim 4, characterized in that: The input end of the active particle feed pipe (48) is connected to a storage tank (5), and the storage tank (5) is connected to the purification box (3). A feed control valve is provided on the outer wall of the active particle feed pipe (48).

6. The integrated purification and emission device for multiple pollutants in oxygen-enriched combustion exhaust gas according to claim 1, characterized in that: A driven gear (92) is provided on the outer wall of the end of one set of spiral shafts (42), and a drive gear (91) that cooperates with the driven gear (92) is provided on the outer wall of the purification box (3). The two adjacent sets of spiral shafts (42) are connected by a transmission component (93).

7. A multi-pollutant integrated purification and emission process for oxygen-enriched combustion exhaust gas, characterized in that: The integrated purification and emission device for multi-pollutant oxygen-enriched combustion exhaust gas according to any one of claims 1-6 includes the following steps: Cooling and drying: The treated exhaust gas enters the cooling tower (1) and the exhaust gas dryer (2) for cooling and drying treatment. Activated carbon purification: It enters the receiving pipe (82) through the T-shaped pipe (81), then enters the spiral shaft (42), passes through the pores to the pore bucket (44), is purified by the activated carbon particles, and is discharged from the filter bucket exhaust pipe (46), and finally discharged through the tail gas exhaust pipe (7). Activated carbon replacement: When activated carbon is deactivated, the control drive gear (91) drives the internal spiral shaft (42) of the driven gear (92) to rotate, and opens the particle discharge control valve above the activated particle discharge pipe (47). The spiral shaft (42) is driven by the spiral auger (45) to discharge activated carbon particles. Activated carbon screening and recovery: The discharged activated carbon passes through the receiving inclined tube (62) to the screening plate (63). The unagglomerated activated carbon is screened into the recovery bucket (61), and the agglomerated activated carbon enters between the inner and outer clamps (65). After being dispersed by the dispersing rod (66), it falls into the bottom of the recovery bucket (61) and is discharged through the collection outlet (67) for recycling. Fill with new activated carbon: After emptying, open the feed control valve below the storage tank (5), and the activated carbon particles enter the pore tank (44) through the activated carbon particle feed pipe. The pore tank (44) is filled with the rotating spiral auger (45).

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