A fly ash pressurized dry ice activation device
Through the fly ash pressurized dry ice activation device, it uses the sublimation and expansion of dry ice to generate mechanical impact force, solves the problems of high energy consumption and low activation efficiency in the existing technology, and achieves efficient and environmentally friendly fly ash activation, reducing environmental pollution and Energy consumption.
Patent Information
- Application Number
- CN202410650820.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2044-05-24
AI Technical Summary
The existing fly ash activation technology has problems such as high energy consumption, easy environment pollution, low activation efficiency and long time.
The fly ash pressurized dry ice activation device is used to sublimate and absorb heat and expand dry ice at room temperature to generate mechanical impact force, significantly improve the specific surface area and porosity of the fly ash, and adjust the activation effect through pressurization to avoid secondary pollution.
It improves the fly ash activation efficiency, reduces energy consumption, reduces environmental pollution, achieves zero waste output, and improves the environmental protection of the system through CO2 recycling.
Smart Images
Figure CN118595113B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of garbage incineration, and in particular to a fly ash pressurized dry ice activation device. Background Art
[0002] A large amount of fly ash is generated during the waste incineration power generation process. The fly ash is composed of dust (from the boiler), deacidification agent (used to remove acidic gases) and activated carbon (to adsorb heavy metals and dioxins). Due to factors such as residence time and reaction conditions, the fly ash still contains a large amount of incompletely reacted deacidification agent (such as slaked lime, baking soda, etc.) and activated carbon that has not played an adsorption role. They are wrapped by dust particles, deacidification reaction products, pollutants in flue gas and other substances, resulting in inability to contact flue gas and lose activity. Therefore, it is very necessary to use fly ash activation technology to fully expose the unreacted components in the fly ash and increase the deacidification and adsorption activity sites of the fly ash.
[0003] At present, the existing technology usually adopts two methods: steam activation and mechanical activation: steam activation has the following shortcomings: first, high energy consumption. Steam activation requires a lot of thermal energy to generate high-temperature steam, and the energy consumption is relatively high. Secondly, the problem of secondary pollution. High-temperature steam may cause harmful substances such as heavy metals in fly ash to volatilize, resulting in secondary pollution; in addition, steam may enter the flue gas and increase its humidity, increasing the risk of low-temperature corrosion. Finally, the efficiency of fly ash activation is limited. Steam activation mainly increases the specific surface area and porosity of fly ash through thermal effect, but the temperature difference between steam and fly ash will not be too high (high steam temperature means high energy consumption), and the crushing effect on fly ash particles is limited, and all active components may not be fully exposed; mechanical activation has the following shortcomings: first, low grinding efficiency. Mechanical grinding activation usually requires a long processing time, and the grinding efficiency is not high, especially for fly ash particles with higher hardness. Secondly, high energy consumption. Mechanical grinding requires a lot of electrical energy (or mechanical energy), and the energy consumption is high. Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention is intended to provide a fly ash pressurized dry ice activation device to solve the problems of high energy consumption, easy environmental pollution, limited fly ash activation efficiency and long activation time in the existing fly ash activation technology.
[0005] To achieve the above-mentioned purpose, the invention adopts the following technical scheme: a fly ash pressurized dry ice activation device, characterized in that it includes a fly ash feeding pipe, an activation chamber, a fly ash separation device, a carbon dioxide solidification device, and a dry ice crushing device;
[0006] One end of the fly ash feed pipe is fixedly connected to a fly ash feed port, and the other end is fixedly connected to a fly ash discharge port. An activation chamber is fixedly provided in the middle of the fly ash feed pipe, and an activation conveying screw is fixedly provided inside the fly ash feed pipe; one end of the activation conveying screw is fixedly connected to the fly ash feed pipe, and the other end of the activation conveying screw is fixedly connected to an activation screw motor outside the fly ash feed pipe;
[0007] One end of the fly ash discharge outlet is fixedly connected to the fly ash feed pipe, and the other end is fixedly connected to the fly ash separation device; the side wall of the fly ash separation device is fixedly connected to a tail gas recovery pipe, and the bottom of the fly ash separation device is fixedly connected to a fly ash discharge pipe; one end of the tail gas recovery pipe is connected to the fly ash separation device, and the end away from the fly ash separation device is connected to the dry ice crushing device, the dry ice crushing device is fixedly connected to the tail gas recovery pipe, the dry ice feed pipe and the first dry ice pressure pump for dry ice that can provide power for solid-liquid mixed dry ice, one end of the first dry ice pressure pump is fixedly connected to the dry ice crushing device, and the end of the first dry ice pressure pump away from the dry ice crushing device is fixedly connected to the dry ice delivery pipe; one end of the dry ice delivery pipe is fixedly connected to the first dry ice pressure pump, and the other end is split into two branches, one end of the dry ice spray gun pipeline is fixedly connected to the branch of the dry ice delivery pipe, and the other end of the dry ice spray gun is fixedly connected to the activation chamber.
[0008] Furthermore, the fly ash feed pipe is an L-shaped pipe structure, and one end of the fly ash feed pipe that is perpendicular to the pipe is close to the fly ash feed port.
[0009] Furthermore, the activated conveying screw includes a first continuous screw, an activated screw shaft, an intermittent screw, and a second continuous screw; the activated screw shaft consists of three sections, a section of the activated screw shaft close to the fly ash feed inlet is fixedly provided with the first continuous screw, a section of the activated screw shaft close to the fly ash discharge outlet is fixedly provided with the second continuous screw, and a section of the activated screw shaft located in the activation chamber is fixedly provided with the intermittent screw.
[0010] Furthermore, the fly ash separation device includes a tail gas collection chamber, a tail gas filter and a fly ash sedimentation chamber; the tail gas collection chamber and the fly ash sedimentation chamber are separated by the tail gas filter, the fly ash funnel passes through the tail gas collection chamber and the tail gas filter and is connected to the fly ash sedimentation chamber, the fly ash discharge pipe is fixedly connected to the bottom of the fly ash sedimentation chamber; the tail gas collection chamber is fixedly connected to a tail gas recovery pipe.
[0011] Furthermore, a gas micro-pressure pump is fixedly connected in the pipeline at one end of the tail gas recovery pipe close to the fly ash separation device.
[0012] Furthermore, the bottom of the fly ash sedimentation chamber is an inclined funnel structure.
[0013] Furthermore, a carbon dioxide solidification device capable of cooling and pressurizing carbon dioxide is fixedly connected to the tail gas recovery pipe.
[0014] Furthermore, the dry ice crushing device includes a dry ice crushing chamber, a dry ice crushing motor, an ice cutting knife, a dry ice crushing shaft, and a dry ice crushing spiral; the exhaust gas recovery pipe and the dry ice feeding pipe are fixedly connected to the top of the dry ice crushing chamber, and an ice cutting knife for cutting dry ice into small pieces of dry ice is fixedly provided below the exhaust gas recovery pipe and the dry ice feeding pipe, the dry ice crushing shaft is fixedly connected below the ice cutting knife, a dry ice crushing spiral is fixedly provided on the dry ice crushing shaft, one end of the dry ice crushing shaft is fixedly connected to the dry ice crushing motor for providing rotational power to the dry ice crushing shaft, and the bottom of the dry ice crushing chamber is an inclined structure.
[0015] Furthermore, the dry ice spray gun includes a spray gun sleeve, an electric protective cover, a nozzle and a spray gun pipe; one end of the spray gun sleeve is fixedly connected to the electric protective cover that controls the nozzle switch, the electric protective cover is fixedly sleeved on the nozzle, the spray gun sleeve is fixedly sleeved on the spray gun pipe, the nozzle is connected to one end of the spray gun pipe, the end of the spray gun pipe away from the nozzle is fixedly connected to the dry ice delivery pipe, and a second dry ice pressure pump is fixedly provided in the pipeline through which the spray gun pipe is connected to the dry ice delivery pipe.
[0016] Furthermore, a pressure baffle is rotatably connected at the junction between the activation chambers, and a pressure switch valve for controlling the rotation state of the pressure baffle according to the pressure in the activation chamber is fixedly connected outside the activation chamber.
[0017] The beneficial effects of the present invention are as follows: the present invention activates fly ash by utilizing the characteristics of dry ice. Dry ice will rapidly sublime from solid to gas at room temperature. In this process, it will absorb a large amount of heat and expand rapidly in volume, which can significantly improve the fly ash activation efficiency. When dry ice sublimates, it will absorb heat from the surrounding environment, causing the fly ash particles to cool rapidly and generate thermal stress. The temperature difference between the fly ash particles and the dry ice is about 250°C. This strong thermal stress can cause microcracks inside and on the surface of the fly ash particles, thereby increasing the specific surface area and porosity of the fly ash; when dry ice sublimates, its volume can expand by hundreds of times, and the gas pressure generated by this expansion can produce a strong mechanical impact force on the fly ash particles; this mechanical impact can not only further break up the fly ash particles, increase their specific surface area and porosity, but also remove almost all active ingredients such as unreacted slaked lime in the fly ash. The dry ice is then sublimated into carbon dioxide gas and no liquid waste is generated, so no secondary pollution is generated during the activation process. The present invention reduces the environmental impact of the activation process to zero through recycling and reuse. The present invention extracts CO2 from the flue gas of a power plant for the replenishment of CO2 in the system, which meets the requirements. Dry ice pressurized activation does not require additional heat input during the activation process, because the heat absorbed during the sublimation of dry ice comes from the fly ash itself and the surrounding environment. Compared with the steam activation method that requires a large amount of energy input, this method is more energy efficient and has a significant energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.
[0019] Figure 1 It is a schematic diagram of a half-section structure of a fly ash pressurized dry ice activation device disclosed in an embodiment of the present invention.
[0020] Figure 2 It is a schematic diagram of a half-section structure of an activated conveying spiral disclosed in an embodiment of the present invention.
[0021] Figure 3 It is a schematic diagram of a half-section structure of a fly ash separation device disclosed in an embodiment of the present invention.
[0022] Figure 4 It is a schematic diagram of a half-section structure of a dry ice crushing device disclosed in an embodiment of the present invention.
[0023] Figure 5It is a schematic diagram of a half-section structure of a dry ice spray gun disclosed in an embodiment of the present invention.
[0024] Figure 6 It is a schematic diagram of a left half-section structure of an activation chamber disclosed in an embodiment of the present invention.
[0025] Figure 7 It is a schematic diagram of a left half-section structure of a pressure baffle disclosed in an embodiment of the present invention.
[0026] In the figure: 1-fly ash feed port, 2-fly ash feed pipe, 3-activated conveying screw, 301-first continuous screw, 302-activated screw shaft, 303-intermittent screw, 304-second continuous screw, 4-activation chamber, 5-dry ice spray gun, 501-spray gun sleeve, 502-electric protection cover, 503-nozzle, 504-spray gun tube, 6-activated screw motor, 7-dry ice crushing device, 701-dry ice crushing chamber, 702-dry ice crushing motor, 703-ice cutting knife , 704-dry ice crushing shaft, 705-dry ice crushing spiral, 8-carbon dioxide solidification device, 9-exhaust gas recovery pipe, 10-gas micro-pressure pump, 11-fly ash separation device, 111-exhaust gas collection chamber, 112-exhaust gas filter, 113-fly ash sedimentation chamber, 12-fly ash discharge pipe, 13-dry ice feed pipe, 14-pressure baffle, 15-fly ash discharge port, 16-first dry ice pressure pump, 17-dry ice delivery pipe, 18-pressure switch valve, 19-second dry ice pressure pump. DETAILED DESCRIPTION
[0027] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.
[0028] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.
[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0030] At present, the existing technology usually adopts two methods: steam activation and mechanical activation: steam activation has the following shortcomings: first, high energy consumption. Steam activation requires a lot of thermal energy to generate high-temperature steam, and the energy consumption is relatively high. Secondly, the problem of secondary pollution. High-temperature steam may cause harmful substances such as heavy metals in fly ash to volatilize, resulting in secondary pollution; in addition, steam may enter the flue gas and increase its humidity, increasing the risk of low-temperature corrosion. Finally, the efficiency of fly ash activation is limited. Steam activation mainly increases the specific surface area and porosity of fly ash through thermal effect, but the temperature difference between steam and fly ash will not be too high (high steam temperature means high energy consumption), and the crushing effect on fly ash particles is limited, and all active components may not be fully exposed; mechanical activation has the following shortcomings: first, low grinding efficiency. Mechanical grinding activation usually requires a long processing time, and the grinding efficiency is not high, especially for fly ash particles with higher hardness. Secondly, high energy consumption. Mechanical grinding requires a lot of electrical energy (or mechanical energy), and the energy consumption is high.
[0031] The present invention aims to provide a fly ash pressurized dry ice activation device to solve the problems of high energy consumption, easy environmental pollution, limited fly ash activation efficiency and long activation time in the existing fly ash activation technology.
[0032] Embodiment 1 of the invention
[0033] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 1 This is a schematic diagram of a half-section structure of a fly ash pressurized dry ice activation device disclosed in an embodiment of the present invention. Figure 2 is a schematic diagram of a half-section structure of an activated conveying spiral disclosed in an embodiment of the present invention, Figure 3 is a schematic diagram of a half-section structure of a fly ash separation device disclosed in an embodiment of the present invention, Figure 4 is a schematic diagram of a half-section structure of a dry ice crushing device disclosed in an embodiment of the present invention, Figure 5 is a schematic diagram of a half-section structure of a dry ice spray gun disclosed in an embodiment of the present invention, Figure 6 is a schematic diagram of a left-side half-section structure of an activation chamber disclosed in an embodiment of the present invention, Figure 7 It is a schematic diagram of the left half-section structure of the pressure baffle disclosed in an embodiment of the present invention; A fly ash pressurized dry ice activation device, characterized in that it includes a fly ash feeding pipe 2, an activation chamber 4, a fly ash separation device 11, a carbon dioxide solidification device 8, and a dry ice crushing device 7;
[0034] One end of the fly ash feed pipe 2 is fixedly connected with a fly ash feed port 1, and the other end is fixedly connected with a fly ash discharge port 15. An activation chamber 4 is fixedly provided in the middle of the fly ash feed pipe 2. An activation conveying spiral 3 is fixedly provided inside the fly ash feed pipe 2. The activation conveying spiral 3 includes a first continuous spiral 301, an activation spiral shaft 302, an intermittent spiral 303, and a second continuous spiral 304. The activation spiral shaft 302 is composed of three sections. The first continuous spiral 301 is fixedly provided in a section of the activation spiral shaft 302 close to the fly ash feed port 1. The second continuous spiral 304 is fixedly provided at a section of the activation spiral shaft 302 near the fly ash discharge port 15, and the intermittent spiral 303 is fixedly provided at a section of the activation spiral shaft 302 located in the activation chamber 4; one end of the activation conveying spiral 3 is fixedly connected to the fly ash feed pipe 2, and the fly ash feed pipe 2 is an L-shaped pipeline structure, and one end of the vertical pipeline of the fly ash feed pipe 2 is close to the fly ash feed port 1, and the other end of the activation conveying spiral 3 is fixedly connected to the activation spiral motor 6 outside the fly ash feed pipe 2;
[0035] One end of the fly ash discharge port 15 is fixedly connected to the fly ash feed pipe 2, and the other end is fixedly connected to the fly ash separation device 11, the fly ash separation device 11 includes a tail gas collection chamber 111, a tail gas filter 112 and a fly ash precipitation chamber 112; the tail gas collection chamber 111 and the fly ash precipitation chamber 112 are separated by the tail gas filter 112, the fly ash funnel passes through the tail gas collection chamber 111 and the tail gas filter 112 and is connected to the fly ash precipitation chamber 112, the fly ash discharge pipe 12 is fixedly connected to the bottom of the fly ash precipitation chamber 112, and the bottom of the fly ash precipitation chamber 112 is inclined The tail gas collection chamber 111 is fixedly connected to a tail gas recovery pipe 9, and a micro-pressure pump 10 is fixedly connected in the pipeline of the tail gas recovery pipe 9 close to the fly ash separation device 11; one end of the tail gas recovery pipe 9 is connected to the fly ash separation device 11, and the end away from the fly ash separation device 11 is connected to the dry ice crushing device 7, and the tail gas recovery pipe 9 is fixedly connected to a carbon dioxide solidification device 8 capable of cooling and pressurizing carbon dioxide; the dry ice crushing device 7 includes a dry ice crushing chamber 701, a dry ice crushing motor 702, an ice cutter 703, a dry ice crushing shaft 704, and a dry ice crushing screw The top of the dry ice crushing chamber 701 is fixedly connected to the exhaust gas recovery pipe 9 and the dry ice feeding pipe 13, and an ice cutter 703 for cutting dry ice into small pieces of dry ice is fixedly provided below the exhaust gas recovery pipe 9 and the dry ice feeding pipe 13. The dry ice crushing shaft 704 is fixedly connected below the ice cutter 703, and a dry ice crushing spiral 705 is fixedly provided on the dry ice crushing shaft 704. One end of the dry ice crushing shaft 704 is fixedly connected to the dry ice crushing motor 702 for providing rotational power to the dry ice crushing shaft 704. The bottom of the dry ice crushing chamber 701 is an inclined structure; it can One end of the first dry ice pressure pump 16 providing power for the solid-liquid mixed dry ice is fixedly connected to the dry ice crushing device 7, and one end of the first dry ice pressure pump 16 away from the dry ice crushing device 7 is fixedly connected to the dry ice delivery pipe 17; one end of the dry ice delivery pipe 17 is fixedly connected to the first dry ice pressure pump 16, and the other end is split into two branches, one end of the dry ice spray gun 5 pipeline is fixedly connected to the branch of the dry ice delivery pipe 17, and the other end of the dry ice spray gun 5 is fixedly connected to the activation chamber 4, and the dry ice spray gun 5 includes a spray gun sleeve 501, an electric protective cover 502, a nozzle 503 and a spray gun pipe 504;One end of the spray gun sleeve 501 is fixedly connected with the electric protective cover 502 for controlling the switch of the nozzle 503. The electric protective cover 502 is fixedly sleeved on the nozzle 503. The spray gun sleeve 501 is fixedly sleeved on the spray gun pipe 504. The nozzle 503 is connected to one end of the spray gun pipe 504. The end of the spray gun pipe 504 away from the nozzle 503 is fixedly connected with the dry ice delivery pipe 17. A second dry ice pressure pump 19 is fixedly arranged in the pipe where the spray gun pipe 504 is connected with the dry ice delivery pipe 17. A pressure baffle 14 is rotatably connected at the junction between the activation chambers 4. A pressure switch valve 18 is fixedly connected outside the activation chamber 4 to control the rotation state of the pressure baffle 14 according to the pressure in the activation chamber 4. ;
[0036] In the embodiment of the present invention, the working process of the embodiment of the present invention is as follows: fly ash is input through the fly ash feed port 1, the fly ash falls into the L-shaped fly ash feed pipe 2, and the fly ash passes through the first continuous spiral 301, the intermittent spiral 303 and the second continuous spiral 304 driven by the activation rotating shaft driven by the activation spiral motor 6, and passes through multiple activation chambers 4; at the same time, the solid-liquid mixed dry ice is crushed in the dry ice crushing chamber 701, and then transported to the dry ice delivery pipe 17 through the first dry ice pressure pump 16, and then input into the dry ice spray gun through the second dry ice pressure pump 19 in the dry ice delivery pipe 17, and the solid-liquid mixed dry ice is output through the dry ice spray gun 5 to enter The activation chamber 4 carries out an activation process, and the activation time of the fly ash in each activation chamber 4 is achieved by controlling the rotation state of the pressure baffle 14 according to the pressure in the activation chamber 4 through the pressure switch valve 18. Finally, after the fly ash is activated, the activated fly ash and the gasified CO2 are discharged into the fly ash separation device 11 through the fly ash discharge port 15 to separate the fly ash and carbon dioxide, and then the fly ash is discharged through the fly ash discharge pipe 12. The carbon dioxide is pumped into the carbon dioxide solidification device 8 through the micro-pressure pump 10 to convert the CO2 into solid-liquid mixed dry ice, and then re-input into the dry ice crushing chamber 701 through the tail gas recovery pipe 9 to achieve the recycling of dry ice.
[0037] Embodiment 2 of the invention
[0038] See also Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 1 This is a schematic diagram of a half-section structure of a fly ash pressurized dry ice activation device disclosed in an embodiment of the present invention. Figure 2 is a schematic diagram of a half-section structure of an activated conveying spiral disclosed in an embodiment of the present invention, Figure 5 is a schematic diagram of a half-section structure of a dry ice spray gun disclosed in an embodiment of the present invention, Figure 6 is a schematic diagram of a left-side half-section structure of an activation chamber disclosed in an embodiment of the present invention, Figure 7It is a schematic diagram of a left half-section structure of a pressure baffle disclosed in an embodiment of the present invention; A fly ash pressurized dry ice activation device, characterized in that it comprises a fly ash feed pipe 2 and an activation chamber 4;
[0039] One end of the fly ash feed pipe 2 is fixedly connected with a fly ash feed port 1, and the other end is fixedly connected with a fly ash discharge port 15. The fly ash feed pipe 2 is an L-shaped pipe structure, and one end of the fly ash feed pipe 2 is close to the fly ash feed port 1. An activation chamber 4 is fixedly arranged in the middle of the fly ash feed pipe 2. A pressure baffle 14 is rotatably connected at the junction between the activation chambers 4. A pressure switch valve 18 is fixedly connected outside the activation chamber 4 to control the rotation state of the pressure baffle 14 according to the pressure in the activation chamber 4; a dry ice spray gun 5 is fixedly connected to the side wall of the activation chamber, and the dry ice spray gun 5 includes a spray gun sleeve 501, an electric protective cover 502, a nozzle 503 and a spray gun pipe 504;
[0040] One end of the spray gun sleeve 501 is fixedly connected to the electric protection cover 502 for controlling the switch of the nozzle 503, the electric protection cover 502 is fixedly sleeved on the nozzle 503, the spray gun sleeve 501 is fixedly sleeved on the spray gun pipe 504, the nozzle 503 is connected to one end of the spray gun pipe 504, and the end of the spray gun pipe 504 away from the nozzle 503 is fixedly connected to the dry ice delivery pipe 17; an activated delivery screw 3 is fixedly arranged inside the fly ash feeding pipe 2; one end of the activated delivery screw 3 is fixedly connected to the fly ash feeding pipe 2, and the other end of the activated delivery screw 3 is fixedly It is connected to the activation screw motor 6 outside the fly ash feed pipe 2; the activated conveying screw 3 includes a first continuous screw 301, an activated screw shaft 302, an intermittent screw 303, and a second continuous screw 304; the activated screw shaft 302 is composed of three sections, a section of the activated screw shaft 302 close to the fly ash feed port 1 is fixedly provided with the first continuous screw 301, a section of the activated screw shaft 302 close to the fly ash discharge port 15 is fixedly provided with the second continuous screw 304, and a section of the activated screw shaft 302 located in the activation chamber 4 is fixedly provided with the intermittent screw 303.
[0041] In an embodiment of the present invention, fly ash is input through a fly ash feed port 1, and the fly ash falls into an L-shaped fly ash feed pipe 2. The fly ash passes through a first continuous spiral 301, an intermittent spiral 303, and a second continuous spiral 304 driven by an activation rotating shaft driven by an activation spiral motor 6, and passes through multiple activation chambers 4; solid-liquid mixed dry ice is poured into a spray gun tube 504, and the solid-liquid mixed dry ice is output through a dry ice spray gun 5 to enter the activation chamber 4 for an activation process, and the activation time of the fly ash in each activation chamber 4 is achieved by a pressure switch valve 18 that can control the rotation state of the pressure baffle 14 according to the pressure in the activation chamber 4, and finally, the fly ash and carbon dioxide are activated in multiple activation chambers 4 and discharged through a fly ash discharge port 15.
[0042] The beneficial effects of the present invention are as follows: the present invention activates fly ash by utilizing the characteristics of dry ice. Dry ice will rapidly sublime from solid to gas at room temperature. In this process, it will absorb a large amount of heat and expand rapidly in volume, which can significantly improve the fly ash activation efficiency. When dry ice sublimates, it will absorb heat from the surrounding environment, causing the fly ash particles to cool rapidly and generate thermal stress. The temperature difference between the fly ash particles and the dry ice is about 250°C. This strong thermal stress can cause microcracks inside and on the surface of the fly ash particles, thereby increasing the specific surface area and porosity of the fly ash; when dry ice sublimates, its volume can expand by hundreds of times, and the gas pressure generated by this expansion can produce a strong mechanical impact force on the fly ash particles; this mechanical impact can not only further break up the fly ash particles, increase their specific surface area and porosity, but also remove almost all active ingredients such as unreacted slaked lime in the fly ash. The dry ice is then sublimated into carbon dioxide gas and no liquid waste is generated, so no secondary pollution is generated during the activation process. The present invention reduces the environmental impact of the activation process to zero through recycling and reuse. The present invention extracts CO2 from the flue gas of a power plant for the replenishment of CO2 in the system, which meets the requirements. Dry ice pressurized activation does not require additional heat input during the activation process, because the heat absorbed during the sublimation of dry ice comes from the fly ash itself and the surrounding environment. Compared with the steam activation method that requires a large amount of energy input, this method is more energy efficient and has a significant energy-saving effect.
[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A fly ash pressurized dry ice activation device, characterized in that: It comprises a fly ash feeding pipe (2), an activation chamber (4), a fly ash separation device (11), a carbon dioxide solidification device (8), and a dry ice crushing device (7); One end of the fly ash feed pipe (2) is fixedly connected to a fly ash feed port (1), and the other end is fixedly connected to a fly ash discharge port (15); an activation chamber (4) is fixedly provided in the middle of the fly ash feed pipe (2), and an activation conveying screw (3) is fixedly provided inside the fly ash feed pipe (2); one end of the activation conveying screw (3) is fixedly connected to the fly ash feed pipe (2), and the other end of the activation conveying screw (3) is fixedly connected to an activation screw motor (6) outside the fly ash feed pipe (2); One end of the fly ash discharge port (15) is fixedly connected to the fly ash feed pipe (2), and the other end is fixedly connected to the fly ash separation device (11); the side wall of the fly ash separation device (11) is fixedly connected to a tail gas recovery pipe (9), and the bottom of the fly ash separation device (11) is fixedly connected to a fly ash discharge pipe (12); one end of the tail gas recovery pipe (9) is connected to the fly ash separation device (11), and the end away from the fly ash separation device (11) is connected to the dry ice crushing device (7), and the dry ice crushing device (7) is fixedly connected to the tail gas recovery pipe (9) and the dry ice feed pipe (13). and a first dry ice pressure pump (16) capable of providing power for the solid-liquid mixed dry ice, one end of the first dry ice pressure pump (16) being fixedly connected to the dry ice crushing device (7), and one end of the first dry ice pressure pump (16) being away from the dry ice crushing device (7) being fixedly connected to a dry ice delivery pipe (17); one end of the dry ice delivery pipe (17) being fixedly connected to the first dry ice pressure pump (16), and the other end being split into two branches, one end of a dry ice spray gun (5) pipeline being fixedly connected to the branch of the dry ice delivery pipe (17), and the other end of the dry ice spray gun (5) being fixedly connected to the inside of the activation chamber (4); The activated conveying screw (3) comprises a first continuous screw (301), an activated screw shaft (302), an intermittent screw (303), and a second continuous screw (304); the activated screw shaft (302) is composed of three sections, the first continuous screw (301) is fixedly provided in a section of the activated screw shaft (302) close to the fly ash feed port (1), the second continuous screw (304) is fixedly provided in a section of the activated screw shaft (302) close to the fly ash discharge port (15), and the intermittent screw (303) is fixedly provided in a section of the activated screw shaft (302) located in the activation chamber (4); The dry ice spray gun (5) comprises a spray gun sleeve (501), an electric protective cover (502), a nozzle (503) and a spray gun pipe (504); one end of the spray gun sleeve (501) is fixedly connected to the electric protective cover (502) for controlling the switch of the nozzle (503); the electric protective cover (502) is fixedly sleeved on the nozzle (503); the spray gun sleeve (501) is fixedly sleeved on the spray gun pipe (504); the nozzle (503) is communicated with one end of the spray gun pipe (504); one end of the spray gun pipe (504) away from the nozzle (503) is fixedly connected to the dry ice delivery pipe (17); a second dry ice pressure pump (19) is fixedly arranged in the pipe through which the spray gun pipe (504) is connected to the dry ice delivery pipe (17).
2. The fly ash pressurized dry ice activation device according to claim 1, characterized in that: The fly ash feed pipe (2) is an L-shaped pipe structure, and one end of the fly ash feed pipe (2) that is vertical to the pipe is close to the end of the fly ash feed port (1).
3. The fly ash pressurized dry ice activation device according to claim 1, characterized in that: The fly ash separation device (11) comprises a tail gas collection chamber (111), a tail gas filter (112) and a fly ash precipitation chamber (113); The exhaust gas collecting chamber (111) and the fly ash settling chamber (113) are separated by the exhaust gas filter (112); the fly ash discharge port (15) passes through the exhaust gas collecting chamber (111) and the exhaust gas filter (112) and is connected to the fly ash settling chamber (113); the fly ash discharge pipe (12) is fixedly connected to the bottom of the fly ash settling chamber (113); and the exhaust gas collecting chamber (111) is fixedly connected to an exhaust gas recovery pipe (9).
4. The fly ash pressurized dry ice activation device according to claim 3, characterized in that: A gas micro-pressure pump (10) is fixedly connected in the pipeline at one end of the tail gas recovery pipe (9) close to the fly ash separation device (11).
5. The fly ash pressurized dry ice activation device according to claim 3, characterized in that: The bottom of the fly ash precipitation chamber (113) is an inclined funnel structure.
6. The fly ash pressurized dry ice activation device according to claim 1, characterized in that: The tail gas recovery pipe (9) is fixedly connected to a carbon dioxide solidification device (8) capable of cooling and pressurizing carbon dioxide.
7. The fly ash pressurized dry ice activation device according to claim 1, characterized in that: The dry ice crushing device (7) comprises a dry ice crushing chamber (701), a dry ice crushing motor (702), an ice cutting knife (703), a dry ice crushing shaft (704), and a dry ice crushing spiral (705); The top of the dry ice crushing chamber (701) is fixedly connected to the exhaust gas recovery pipe (9) and the dry ice feeding pipe (13); an ice cutter (703) for cutting dry ice into small pieces of dry ice is fixedly provided below the exhaust gas recovery pipe (9) and the dry ice feeding pipe (13); the dry ice crushing shaft (704) is fixedly connected below the ice cutter (703); a dry ice crushing spiral (705) is fixedly provided on the dry ice crushing shaft (704); one end of the dry ice crushing shaft (704) is fixedly connected to the dry ice crushing motor (702) for providing rotational power to the dry ice crushing shaft (704); and the bottom of the dry ice crushing chamber (701) is an inclined structure.
8. The fly ash pressurized dry ice activation device according to claim 1, characterized in that: A pressure baffle (14) is rotatably connected to the junction between the activation chambers (4), and a pressure switch valve (18) is fixedly connected outside the activation chamber (4) for controlling the rotation state of the pressure baffle (14) according to the pressure inside the activation chamber (4).