Fly ash steam activation equipment

Abstract

The utility model belongs to the technical field of household garbage incineration flue gas purification treatment, and relates to a fly ash steam activation device which comprises a double-shaft spiral structure rotating oppositely, a feeding section shell, a mixing activation section shell and a discharging section shell, the feeding section shell, the mixing activation section shell and the discharging section shell are communicated in sequence, a feeding port is formed in the feeding section shell, a discharging port is formed in the discharging section shell, and a discharging port is formed in the mixing activation section shell. A steam inlet is formed in the mixed activation section shell; the double-shaft spiral structure comprises two transmission shafts which penetrate through the feeding section shell and the mixed activation section shell and are rotationally mounted, the two transmission shafts are arranged side by side, continuous rotating blades are arranged on the transmission shafts in the feeding section shell of the double-shaft spiral structure, and the two groups of continuous rotating blades are not crossed in space so as to form a double-shaft spiral conveying structure; the double-shaft spiral structure is provided with discontinuous paddle blades on the transmission shaft in the mixing and activating section shell, and the two groups of discontinuous paddle blades are crossed in space to form a double-shaft spiral stirring and conveying structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of smoke purification treatment during the incineration of domestic garbage, and relates to a steam activated fly ash device. Background Art

[0002] Pollutants in the flue gas from the incineration of domestic waste include acidic gases (HCl, SO X etc.), dust, heavy metals (Hg, Pb, Cr, etc.) and organic pollutants (dioxins and furans, etc.). In order to prevent these pollutants from causing secondary pollution to the environment, the flue gas must be purified. The flue gas purification process is generally divided into two steps: one is deacidification, and the other is dust removal. The removal of heavy metals and organic matter is integrated in these two steps. Among them, the dust removal, heavy metal and organic matter removal processes are relatively fixed, while there are many processes for the removal of acidic gases (also known as "flue gas deacidification"). Generally speaking, according to the state of the deacidifier and whether there is wastewater discharged, the flue gas deacidification technology in the field of waste incineration is divided into three categories: wet, semi-dry and dry. Its technical principles, advantages and disadvantages, etc. are listed in detail below.

[0003]

[0004] By comparing the three types of flue gas deacidification technologies, it is found that the semi-dry and wet systems are complex, and the wet method will produce a large amount of wastewater and have high operating costs. The dry deacidification technology has obvious advantages. If the problems of poor dry deacidification effect and large amount of fly ash generated are solved, the environmental, economic and social benefits of the dry deacidification technology will be exceptionally outstanding.

[0005] Further analysis found that the existing dry deacidification technology mainly directly sprays the deacidifier (slaked lime or baking soda, or activated carbon) into the flue mixer. The slaked lime is carried by the flue gas into the bag filter, adheres to the surface of the bag filter and reacts with the acidic gas, and is finally collected and treated as fly ash. The traditional dry process is simple, and the deacidifier (slaked lime) has a low dispersion, resulting in uneven distribution on the filter bag surface and a short effective residence time in the bag filter. At the same time, the flue gas temperature deviates from the optimal reaction temperature, and products such as CaCl2 / CaSO3 block the surface and pores of the reactants, resulting in a very low utilization rate inside the particles, resulting in a low overall utilization rate of the agent and a high fly ash output. The economy is poor. At the same time, research and development found that the main factors affecting dry deacidification are: stoichiometric ratio (Ca / Cl, Ca / S); relative humidity; flue gas temperature and residence time, etc.

[0006] At present, by improving the influencing factors of dry deacidification, a new dry and efficient deacidification technology process is provided to increase the reaction humidity and residence time; control the reaction temperature; increase the utilization rate of the deacidification agent (slaked lime) dry powder and reduce the amount of fly ash generated. Specific method: After the flue gas is adjusted to the optimal process temperature through temperature regulation, it passes through the flue mixer, and undergoes deacidification reaction and activated carbon adsorption with the deacidification agent (slaked lime) and activated carbon (or equivalent) sprayed into the flue mixer. The flue gas then passes through the bag filter, and the particulate matter is filtered and collected to form purified flue gas and be discharged. Among them, the surface of the deacidification particulate matter collected by the bag filter is covered with the deacidification reactant CaCl2 / CaSO3, which wraps the unreacted deacidification agent inside, making it impossible for the deacidification agent inside to further undergo deacidification reaction. In other words, only part of the deacidification agent reacts with the acid gas in the flue gas, and the agent utilization rate is low. Therefore, it is necessary to activate the fly ash to improve its calcification degree, catalyst activity and acid gas absorption capacity. The reactants on the surface of the deacidifying agent particles are activated with the unreacted deacidifying agent inside to form an activated product. The activated product also has a deacidifying effect. The activated fly ash is circulated into the flue mixer and bag filter to mix and react with the flue gas, thereby increasing the utilization rate of the agent and reducing the amount of fly ash.

[0007] In order to meet the technical requirements of the new dry and efficient deacidification technology, a device specifically used for fly ash activation is needed. Utility Model Content

[0008] In view of this, the purpose of the utility model is to provide a steam activated fly ash device to solve the problem of fly ash activation.

[0009] In order to achieve the above object, the utility model provides the following technical solutions:

[0010] A steam activated fly ash device comprises a double-axis spiral structure rotating in opposite directions, a feed section shell, a mixing and activation section shell and a discharge section shell which are connected in sequence, wherein a feed port is provided on the feed section shell, a discharge port is provided on the discharge section shell, and a steam inlet is provided on the mixing and activation section shell;

[0011] The double-axis spiral structure includes two transmission shafts that penetrate the feed section shell and the mixing and activation section shell and are rotatably installed, and the two transmission shafts are arranged side by side. The double-axis spiral structure is provided with continuous rotating blades on the transmission shaft in the feed section shell, and the continuous rotating blades on the two transmission shafts do not cross in space, so as to form a double-axis spiral conveying structure to convey the fly ash in the feed section shell to the mixing and activation section shell;

[0012] The double-axis spiral structure is provided with intermittent paddle blades on the transmission shaft in the mixing and activation section shell, and the intermittent paddle blades on the two transmission shafts are spatially crossed to form a double-axis spiral stirring and conveying structure, which stirs the fly ash in the mixing and activation section shell and conveys it to the discharge section shell.

[0013] Furthermore, it also includes a driving device for driving the double-axis spiral structure.

[0014] Furthermore, the driving device includes a reduction motor and a gear transmission box drivingly connected to the reduction motor, and the gear transmission box is respectively connected to the ends of the two transmission shafts to drive the two transmission shafts to rotate towards each other.

[0015] Furthermore, the steam inlet is a plurality of openings arranged on the bottom plate of the mixing and activation section shell along the fly ash conveying direction, and each opening is connected to a steam input pipe.

[0016] Furthermore, each of the steam input pipes is connected to the main steam pipe.

[0017] Furthermore, a shielding plate is provided above the steam inlet.

[0018] Furthermore, the shielding plate is an inverted V-shaped structure to prevent fly ash from blocking the steam inlet, and a gap is left between the two sides of the inverted V-shaped structure and the bottom plate of the mixing activation section shell to facilitate steam diffusion.

[0019] Furthermore, a height adjustment baffle is provided at one end of the mixing and activation section shell close to the discharge section to adjust the height of the tail end of the mixing and activation section shell connected to the discharge section shell, thereby controlling the fly ash activation time.

[0020] Furthermore, the outer sides of the feed section shell, the mixing and activation section shell and the discharge section shell are all wrapped with a heat-insulating layer.

[0021] Furthermore, the feed port is arranged at the top of the feed section shell, the discharge port is arranged at the bottom of the discharge section shell, and the steam inlet is arranged at the bottom of the mixing and activation section shell.

[0022] The beneficial effects of the utility model are:

[0023] 1. The utility model provides a steam-activated fly ash equipment, which utilizes steam to maintain a high temperature and high humidity environment, and further reacts the fly ash calcification with the unreacted slaked lime in the fly ash to form an activated product, so that the activated product can be recycled, for example, sent into the flue gas for recycling; the steam-activated fly ash equipment uses a double helix structure with a feed section shell and a mixing activation section shell that are connected in sequence to combine the transportation of fly ash with steam activation, and realizes the activation of fly ash during the transportation of fly ash, thereby ensuring that the fly ash is fully and evenly activated, and the activated fly ash does not become hardened. In addition, the utilization rate of the deacidifying agent (slaked lime) dry powder is increased, and the amount of fly ash generated is reduced.

[0024] 2. The double helix structure is provided with different blades in different sections, so as to integrate the quantitative transportation of fly ash and the activation stirring, thereby controlling the fly ash activation amount and the fly ash activation time, making the whole dry flue gas deacidification system using the steam activated fly ash equipment easy to control.

[0025] 3. The steam-activated fly ash equipment is provided with a height-adjusting baffle at one end of the mixing activation section shell close to the discharge section. The height of the connection between the tail end of the mixing activation section shell and the discharge section shell is adjusted by the height-adjusting baffle, thereby controlling the fly ash activation time; and the fly ash activated by the steam-activated fly ash equipment can be directly sent into the flue or the flue mixer. Since the output of the activated fly ash is uniform and mixed with the flue gas is also uniform, the entire recycling reaction is uniform and easy to control.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a structural schematic diagram of a steam activated fly ash device in the utility model;

[0029] Figure 2 for Figure 1 A top view of

[0030] Figure 3 for Figure 1 AA section diagram;

[0031] Figure 4 for Figure 1 BB section diagram;

[0032] Figure 5 for Figure 1 CC cross-section diagram;

[0033] Figure 6 The utility model is a schematic diagram of the principle of a steam activated fly ash device.

[0034] Figure numerals: reduction motor 1, gear transmission box 2, feed section shell 3, double-axis screw conveying structure 4, continuous rotating blades 41, double-axis screw stirring and conveying structure 5, intermittent paddle blades 51, mixing activation section shell 6, discharge section shell 7, main steam pipe 8, steam input pipe 9, height adjustment baffle 10, coupling 11, transmission shaft 12, shielding plate 13. DETAILED DESCRIPTION

[0035] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0036] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] See also Figure 1 to Figure 5, which is a steam-activated fly ash equipment, including a driving section, a feeding section, a mixing activation section, a discharging section and a double-axis spiral structure divided according to function, the feeding section, the mixing activation section and the discharging section all have a shell for accommodating fly ash, which are a feeding section shell 3, a mixing activation section shell 6 and a discharging section shell 7 respectively, and the feeding section shell 3, the mixing activation section shell 6 and the discharging section shell 7 are sequentially connected.

[0039] A feed port is provided at the top of the feed section shell 3, a discharge port is provided at the bottom of the discharge section shell 7, and a steam inlet is provided at the bottom of the mixing and activation section shell 6, and the steam inlet is connected to the steam input pipe 9;

[0040] The double-shaft spiral structure includes two transmission shafts 12 that penetrate the feed section housing 3, the mixing and activation section housing 6 and the discharge section housing 7 and are rotatably installed, and the two transmission shafts 12 are arranged side by side;

[0041] In another embodiment, the transmission shaft 12 may also be configured to only pass through the feed section housing 3 and the mixing and activation section housing 6 to adapt to different housing structures.

[0042] The double-axis spiral structure is provided with continuous rotating blades 41 on the transmission shaft 12 in the feed section shell 3, and the continuous rotating blades 41 on the two transmission shafts 12 do not cross in space, so as to form a double-axis spiral conveying structure 4, which conveys the fly ash in the feed section shell to the mixing and activation section shell;

[0043] In the double-axis spiral structure, intermittent paddle blades 51 are provided on the transmission shaft 12 in the mixing and activation section shell, and the intermittent paddle blades 51 on the two transmission shafts 12 are spatially crossed to form a double-axis spiral stirring and conveying structure 5, which stirs the fly ash in the mixing and activation section shell 6 and conveys it to the discharge section shell 7, ensuring that the fly ash is stirred by the intermittent paddle blades 51, fully broken up and mixed, and conveyed to the discharge section.

[0044] The driving section includes a driving device, which includes a reduction motor 1 and a gear transmission box 2 connected to the reduction motor 1, and the gear transmission box 2 is respectively connected to the ends of the two transmission shafts 12 to drive the two transmission shafts 12 to rotate towards each other.

[0045] Specifically, the reduction motor 1 and the gear transmission box 2 as well as the gear transmission box 2 and the transmission shaft 12 are connected via a coupling 11 .

[0046] The steam activated fly ash equipment is a new type of equipment integrating fly ash activation and fly ash transportation. Two spiral rods rotating in opposite directions cooperate with the continuous rotating blades 41 and the intermittent paddle blades 51 installed thereon to form a double-axis spiral conveying structure 4 and a double-axis spiral stirring conveying structure 5. Driven by the driving device, the double-axis spiral conveying structure 4 first conveys the fly ash entering the feed section shell 3 from the feed port to the mixing activation section shell 6. In the mixing activation section, the paddles on one side of the double-axis spiral stirring conveying structure 5 throw up the material and rotate with it, and the paddles on the other side of the shaft use the phase difference to rotate and throw up the material thrown up on one side in the opposite direction, and the materials on both sides fall into the cavity between the two shafts, so that the material forms a fluidized weightless zone in the central part of the mixing activation section shell 6; the transmission shaft 12 rotates at a low circumferential speed, and the material is lifted to form a rotating vortex. The vortex in the weightless state produces a mixing effect, so that the material is quickly, fully and evenly mixed with the moving material, and enters the discharge section shell 7, and finally discharged through the discharge port.

[0047] In other embodiments, driving devices of other structural forms may also be used to drive the transmission shaft 12 to rotate.

[0048] Preferably, the steam inlet is a plurality of openings arranged on the bottom plate of the mixing and activation section shell along the fly ash conveying direction, each opening is connected to a steam input pipe 9, and each steam input pipe 9 is connected to a main steam pipe 8, so as to prevent uneven steam introduction, steam condensation, and the formation of fly ash hardening after moisture absorption. The main steam pipe 8 is connected to an external steam source to provide steam.

[0049] Preferably, the plurality of openings of the steam inlet are evenly arranged.

[0050] Furthermore, a baffle plate 13 is provided above the steam inlet to prevent fly ash from entering the steam input pipe 9; the baffle plate 13 is an inverted V-shaped structure, and the baffle plate is an inverted V-shaped structure to prevent fly ash from blocking the steam inlet, and a gap is left between the two sides of the inverted V-shaped structure and the bottom plate of the mixing activation section shell (the gap can also be set as a strip hole) to facilitate steam diffusion, thereby allowing steam to enter the mixing activation section shell 6.

[0051] Furthermore, a height-adjusting baffle 10 is provided at one end of the mixing and activation section shell 6 close to the discharge section, and the height of the mixing and activation section shell 6 connected to the discharge section shell 7 at the tail end is adjusted by the height-adjusting baffle 10, thereby determining the fly ash activation time. The higher the height-adjusting baffle 10 is, the more fly ash is in the mixing and activation section shell 6, and the longer the time it takes for the fly ash to be delivered from the feed section to the mixing and activation section, and vice versa.

[0052] Preferably, the outer sides of the feed section shell 3, the mixing and activation section shell 6 and the discharge section shell 7 are all wrapped with a thermal insulation layer to ensure that the internal ambient temperature of the equipment is stable during the entire fly ash activation process.

[0053] Preferably, the discharge port is connected to the flue in the flue mixer, and the activated fly ash is directly or indirectly sent into the flue to be mixed with the flue gas.

[0054] See also Figure 6 The principle of the steam activated fly ash equipment is as follows:

[0055] The steam activated fly ash equipment uses steam to activate the deacidification agent (slaked lime) in the fly ash. Exposing the fly ash to a high-temperature steam atmosphere for a period of time can significantly improve its calcification degree, catalyst activity and acid gas absorption capacity. Steam can react with the active components in the fly ash to make it more active. Steam activation can significantly increase the surface area, pore structure and activity of the chemical composition of the fly ash.

[0056] Principle of fly ash activation: After slaked lime is sprayed into the flue gas, it reacts with the acidic gas in the flue gas to form calcification on the surface of the slaked lime. Through the action of steam, the surface calcification reacts with the internal slaked lime to generate an activated product CaClOH, which reacts with the acidic gas in the flue gas to eventually form a stable calcification.

[0057] Taking the removal of acidic gas HCl by slaked lime as an example, Ca(OH)2 reacts with HCl to produce CaCl2 on the surface of Ca(OH)2 particles. Under the action of high temperature and high humidity of steam, CaCl2 on the surface of Ca(OH)2 particles reacts with unreacted Ca(OH)2 inside to produce CaClOH. The activated CaClOH is sent into the flue gas again to further react with HCl in the flue gas to produce stable calcified CaCl2. This method reduces the amount of Ca(OH)2 used, improves the deacidification efficiency of Ca(OH)2, and reduces the amount of fly ash generated.

[0058] Based on this principle, the steam-activated fly ash equipment of the utility model arranges the steam injection device reasonably so that the steam can fully and evenly contact the circulating fly ash and activate it, thereby greatly increasing the specific surface area of ​​the fly ash, activating the reacted calcification and unreacted lime in the fly ash, and producing an activated product that can react with the acid gas again, thereby increasing its absorption capacity for the acid gas.

[0059] Specifically, in a dry flue gas deacidification system using the steam-activated fly ash equipment, the feed port is connected to a fly ash collection device (or an ash outlet of a bag-type dust collector) of the dry flue gas deacidification system, and the discharge port is connected to a flue (or a flue mixer) connected to the bag-type dust collector, thereby realizing the fly ash recycling of the dry flue gas deacidification system, that is, increasing the utilization rate of the deacidification agent (slaked lime) dry powder and reducing the amount of fly ash generated.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A steam activated fly ash device, characterized in that: It comprises a double-axis spiral structure rotating in opposite directions, a feed section shell, a mixing and activation section shell and a discharge section shell which are connected in sequence, wherein the feed section shell is provided with a feed inlet, the discharge section shell is provided with a discharge outlet, and the mixing and activation section shell is provided with a steam inlet; The double-axis spiral structure includes two transmission shafts that penetrate the feed section shell and the mixing and activation section shell and are rotatably installed, and the two transmission shafts are arranged side by side. The double-axis spiral structure is provided with continuous rotating blades on the transmission shaft in the feed section shell, and the continuous rotating blades on the two transmission shafts do not cross in space, so as to form a double-axis spiral conveying structure to convey the fly ash in the feed section shell to the mixing and activation section shell; The double-axis spiral structure is provided with intermittent paddle blades on the transmission shaft in the mixing and activation section shell, and the intermittent paddle blades on the two transmission shafts are spatially crossed to form a double-axis spiral stirring and conveying structure, which stirs the fly ash in the mixing and activation section shell and conveys it to the discharge section shell.

2. The steam activated fly ash equipment according to claim 1, characterized in that: Also included is a driving device for driving the double-axis spiral structure.

3. The steam activated fly ash equipment according to claim 2, characterized in that: The driving device comprises a reduction motor and a gear transmission box which is transmission-connected to the reduction motor, and the gear transmission box is respectively connected to the ends of the two transmission shafts to drive the two transmission shafts to rotate towards each other.

4. The steam activated fly ash equipment according to claim 1, characterized in that: The steam inlet is a plurality of openings arranged on the bottom plate of the mixing and activation section shell along the fly ash conveying direction, and each opening is connected to a steam input pipe.

5. The steam activated fly ash equipment according to claim 4, characterized in that: Each of the steam input pipes is connected to the main steam pipe.

6. The steam activated fly ash equipment according to claim 4, characterized in that: A shielding plate is also provided above the steam inlet.

7. The steam activated fly ash equipment according to claim 6, characterized in that: The shielding plate is an inverted V-shaped structure to prevent fly ash from blocking the steam inlet, and a gap is left between the two sides of the inverted V-shaped structure and the bottom plate of the mixing activation section shell to facilitate steam diffusion.

8. The steam activated fly ash equipment according to claim 1, characterized in that: A height adjustment baffle is provided at one end of the mixing and activation section shell close to the discharge section to adjust the height of the tail end of the mixing and activation section shell connected to the discharge section shell, thereby controlling the fly ash activation time.

9. The steam activated fly ash equipment according to claim 1, characterized in that: The outer sides of the feed section shell, the mixing and activation section shell and the discharge section shell are all wrapped with a heat-insulating layer.

10. The steam activated fly ash equipment according to claim 1, characterized in that: The feed port is arranged at the top of the feed section shell, the discharge port is arranged at the bottom of the discharge section shell, and the steam inlet is arranged at the bottom of the mixing and activation section shell.

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