Continuous preparation method and equipment of granular calcium-based desulfurizing agent

Abstract

The invention provides a continuous preparation method and equipment of a granular calcium-based desulfurizer, and belongs to the technical field of preparation of desulfurizers, the method comprises the following steps: burdening, grinding and dry mixing: grinding and mixing raw materials according to a certain proportion, and feeding the obtained mixture into a wet mixing unit; wet mixing: adding water into the mixture for wet mixing, and feeding the wet mixture into a strip extrusion unit; strip extrusion: carrying out extrusion molding on the wet mixed material, and feeding molded particles into a drying unit; drying: drying the formed particles and then feeding into a finished product storage unit; and finished product storage: conveying the dried formed particles to a finished product bin. According to continuous preparation of the granular calcium-based desulfurizing agent, a large amount of manual participation can be reduced, continuous feeding and grinding can be achieved, the requirement for fineness of raw materials is greatly lowered, blocky raw materials can be used, the proportion of mixed materials is stable, large-amount storage can be achieved, the step of dry mixing is omitted subsequently, and the production time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of desulfurizing agents, and in particular to a continuous preparation method and equipment for a granular calcium-based desulfurizing agent. Background Art

[0002] While fossil fuels such as coal and oil provide energy security for the development of the world economy, they also bring about various environmental problems. Among them, SO 2 It has become one of the main sources of global environmental pollution. At the same time, SO2 also exists in the production process of some non-power industries. 2 Emissions issues: large amounts of SO2 are released into the air 2 The gas not only harms human health, but also forms acid rain when it meets water, which causes great harm to forests, soil, lakes and other ecosystems. Therefore, it is necessary to strengthen SO 2 Control of pollutant emissions.

[0003] At present, the flue gas desulfurization technologies used in industry mainly include: dry desulfurization, semi-dry desulfurization and wet desulfurization. Among them, wet desulfurization has a high desulfurization efficiency and is widely used in flue gas desulfurization in power plants; semi-dry desulfurization has a high desulfurization efficiency, but its operation is more complicated than dry desulfurization; although dry desulfurization has a relatively low desulfurization efficiency, it has low equipment investment and simple process, and also has a broad application market. Desulfurizers are the key to dry desulfurization technology. Desulfurizers on the market can be roughly divided into calcium-based, sodium-based, magnesium-based, etc. Among the many desulfurizers, the preparation method of calcium-based desulfurizers is relatively simple, the raw material resources are extensive, and the desulfurization products have no side effects on the composition and performance of cement clinker. It is a good raw material for the production of building materials, and the social and environmental benefits are very outstanding. It has received great attention from researchers and accounts for about 90% of all desulfurizers.

[0004] At present, the preparation process commonly used for calcium-based desulfurizers is the intermittent production process. The intermittent production process is completed in stages from raw material mixing to carrier preparation, and transmission equipment is used in the middle to achieve semi-automation. During the entire production process, relevant personnel must always monitor the operation and adjustment of the feeding and discharging process. The proportion of manual labor is high, which affects the production efficiency, and has high requirements for indicators such as the fineness of the raw materials. Summary of the invention

[0005] The present invention aims to provide a continuous preparation method and equipment for a granular calcium-based desulfurizing agent, in order to at least partially solve at least one of the above-mentioned technical problems.

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a continuous preparation method of a granular calcium-based desulfurizer, comprising:

[0007] Ingredient grinding and dry mixing: the raw materials are ground and mixed in a certain proportion, and the resulting mixture is sent to the wet mixing unit;

[0008] Wet mixing: adding water to the mixture for wet mixing, and sending the wet mixture into the extrusion unit;

[0009] Extrusion: The wet mixture is extruded into shape and the formed particles are fed into the drying unit;

[0010] Drying: The formed particles are dried and sent to the finished product storage unit;

[0011] Finished product storage: The dried granules are sent to the finished product warehouse.

[0012] According to a preferred embodiment of the present invention,

[0013] Ingredient grinding and dry mixing: The raw materials are fed from the raw material bin to the scraper conveyor according to a certain proportion through the first spiral feeder scale, and then enter the ball mill through the scraper conveyor for grinding and preliminary mixing;

[0014] Wet mixing: The mixed material is sent from the output end of the ball mill to the mixing bin through the first bucket elevator, and then from the mixing bin to each screw kneader through the second screw feeder scale. At the same time, water is added to each screw kneader through the water metering scale for wet mixing;

[0015] Extrusion: After a certain period of wet mixing, the valve at the bottom of each ribbon mixer is opened, the wet mixed material is placed on the first transmission device, and the wet mixed material is sent to the extruder for extrusion molding;

[0016] Drying: The extruder extrudes the shaped particles and sends them to the drying box through the second transmission device for drying;

[0017] Finished product storage: The dried granules are sent to the finished product warehouse for storage through the third transmission device and bucket elevator.

[0018] In order to solve the above technical problems, the second aspect of the present invention provides a continuous preparation device for a granular calcium-based desulfurizing agent, comprising:

[0019] The batching, grinding and dry mixing unit is used to grind and mix the raw materials in a certain proportion, and send the obtained mixture to the wet mixing unit;

[0020] A wet mixing unit is used to add water to the mixed material for wet mixing, and to feed the wet mixed material into the extrusion unit;

[0021] The extrusion unit is used to extrude the wet mixture into shapes and send the shaped particles into the drying unit;

[0022] A drying unit, used to dry the formed particles and then send them to a finished product storage unit;

[0023] The finished product storage unit is used to deliver the dried shaped particles to the finished product bin.

[0024] According to a preferred embodiment of the present invention, the batching, grinding and dry mixing unit comprises: a plurality of raw material bins, a scraper conveyor, and a ball mill;

[0025] The output end of each raw material bin is connected to a corresponding first spiral feeder scale, the scraper conveyor is arranged below the first spiral feeder scale, and the output end of the scraper conveyor is connected to the input end of the ball mill.

[0026] According to a preferred embodiment of the present invention, the wet mixing unit comprises: a first bucket elevator, a mixing bin, a water tank, and a plurality of ribbon kneaders;

[0027] The input end of the mixing bin is connected to the output end of the ball mill via the first bucket elevator, the output end of the mixing bin is connected to the input ends of multiple ribbon kneaders via the second spiral feeding scale, the water outlet end of the water tank is connected to the input ends of multiple ribbon kneaders via the water metering scale, and a first transmission device is provided below the output ends of the multiple ribbon kneaders.

[0028] According to a preferred embodiment of the present invention, the extrusion unit comprises: an extruder connected to the output end of the first transmission device, and a second transmission device arranged below the output end of the extruder.

[0029] According to a preferred embodiment of the present invention, the drying unit comprises: a drying box connected to the output end of the second transmission device, and a third transmission device arranged below the output end of the drying box.

[0030] According to a preferred embodiment of the present invention, a double-layer transmission mechanism is provided in the drying box.

[0031] According to a preferred embodiment of the present invention, the finished product storage unit comprises: a second bucket elevator arranged at the output end of the third transmission device, and a finished product bin connected to the second bucket elevator.

[0032] In summary, the continuous preparation method and equipment of granular calcium-based desulfurizing agent provided by the present invention have at least the following beneficial effects compared with the prior art:

[0033] 1. The present invention realizes continuous feeding and grinding, greatly reduces the requirement for the fineness of raw materials, can use block raw materials, the mixed material ratio is stable, and a large amount of storage can be achieved, and the subsequent dry mixing step is eliminated, shortening the production time.

[0034] 2. The wet mixing unit of the present invention adopts multiple ribbon kneaders, which can realize batch-by-batch step-by-step wet mixing, and can make the subsequent wet mixed material discharge continuous. The extruder can operate continuously, which greatly increases the production efficiency.

[0035] 3. The drying box of the present invention adopts double-layer belt conveyor inside to realize continuous feeding and discharging of materials and ensure the drying temperature and time of the formed particles.

[0036] 4. All operations of the present invention can be realized by program control and can be chained. Workers only need to clean up every shift, thereby reducing a large amount of manual participation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic flow chart of a continuous preparation method of a granular calcium-based desulfurizing agent provided by an embodiment of the present invention;

[0038] Figure 2 It is a schematic flow diagram of a continuous preparation method of a granular calcium-based desulfurizing agent provided by an embodiment of the present invention;

[0039] Among them: 1-raw material warehouse, 2-first spiral feeder scale, 3-scraper conveyor, 4-ball mill, 5-first bucket elevator, 6-mixing warehouse, 7-water tank, 8-water metering scale, 9-ribbon mixer, 10-first transmission device, 11-extruder, 12-drying box, 13-finished product warehouse, 14-second bucket elevator, 15-second transmission device, 16-third transmission device, 17-second spiral feeder scale. DETAILED DESCRIPTION

[0040] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0042] The present invention provides a continuous preparation method of a granular calcium-based desulfurizing agent, such as Figure 1 As shown, the method includes:

[0043] S1. Ingredient grinding and dry mixing: grind and mix the raw materials in a certain proportion, and send the obtained mixture to the wet mixing unit;

[0044] refer to Figure 2 In this step, the raw materials can be fed from the raw material bin 1 through the first spiral feeder 2 to the scraper conveyor 3 in a certain proportion, and then enter the ball mill 4 through the scraper conveyor 3 for grinding and preliminary mixing.

[0045] S2, wet mixing: adding water to the mixture for wet mixing, and sending the wet mixed material into the extrusion unit;

[0046] refer to Figure 2 The mixed material is fed from the output end of the ball mill 4 into the mixing bin 6 through the first bucket elevator 5, and then from the mixing bin 6 to each ribbon kneader 9 through the second spiral feeder scale 17. At the same time, water is added to each ribbon kneader 9 through the water metering scale 8 for wet mixing;

[0047] S3, extrusion: extruding the wet mixture into shapes and sending the formed particles into the drying unit;

[0048] refer to Figure 2 After a certain period of wet mixing, the bottom valves of each ribbon mixer 9 are opened, the wet mixed material is placed on the first transmission device 10, and the wet mixed material is sent to the extruder 11 for extrusion molding; at the same time, the mixing bin 6 starts to send a new batch of mixed material to the ribbon mixer 9, and the above wet mixing operation is repeated.

[0049] S4, drying: drying the formed particles and sending them to the finished product storage unit;

[0050] refer to Figure 2 The extruder 11 extrude the formed particles, which are then sent to the drying box 12 through the second transmission device 15 for drying.

[0051] S5, finished product storage: the dried shaped particles are sent to the finished product warehouse 13.

[0052] refer to Figure 2 The dried shaped particles are sent to the finished product bin 13 for storage via the third transmission device 16 and the bucket elevator.

[0053] Based on the above-mentioned continuous preparation method of granular calcium-based desulfurizing agent, the present invention also provides a continuous preparation device of granular calcium-based desulfurizing agent, such as Figure 2 As shown, the device includes:

[0054] The batching, grinding and dry mixing unit is used to grind and mix the raw materials in a certain proportion, and send the obtained mixture to the wet mixing unit;

[0055] A wet mixing unit is used to add water to the mixed material for wet mixing, and to feed the wet mixed material into the extrusion unit;

[0056] The extrusion unit is used to extrude the wet mixture into shapes and send the shaped particles into the drying unit;

[0057] A drying unit, used to dry the formed particles and then send them to a finished product storage unit;

[0058] The finished product storage unit is used to deliver the dried shaped particles to the finished product bin 13.

[0059] In a specific embodiment, Figure 2 The batching, grinding and dry mixing unit includes: five raw material bins 1, a scraper conveyor 3, and a ball mill 4; wherein: the output end of each raw material bin 1 is connected to a corresponding first spiral feeder scale 2, the scraper conveyor 3 is arranged below the first spiral feeder scale 2, and the output end of the scraper conveyor 3 is connected to the input end of the ball mill 4. Therefore, the raw materials can be put into the scraper conveyor 3 according to a certain proportion from the raw material bin 1 through the first spiral feeder scale 2, and enter the ball mill 4 through the scraper conveyor 3 for grinding and preliminary mixing.

[0060] The wet mixing unit includes: a first bucket elevator 5, a mixing bin 6, a water tank 7, and five screw kneaders 9; wherein: the input end of the mixing bin 6 is connected to the output end of the ball mill 4 via the first bucket elevator 5, the output end of the mixing bin 6 is respectively connected to the input ends of the five screw kneaders 9 via the second screw feeder 17, the water outlet end of the water tank 7 is respectively connected to the input ends of the five screw kneaders 9 via the water metering scale 8, and a first transmission device 10 is provided below the output ends of the five screw kneaders 9. The mixed material is fed from the output end of the ball mill 4 into the mixing bin 6 through the first bucket elevator 5, and then from the mixing bin 6 to each screw kneader 9 through the second screw feeder 17, and water is added to each screw kneader 9 through the water metering scale 8 for wet mixing. The wet mixing unit of this embodiment adopts five ribbon kneaders 9, which can realize batch-by-batch step-by-step wet mixing, and can make the subsequent wet mixed material discharge continuous. The extruder can operate continuously for production, which greatly increases the production efficiency.

[0061] The extrusion unit includes: an extruder 11 connected to the output end of the first transmission device 10, and a second transmission device 15 arranged below the output end of the extruder 11. After a certain period of wet mixing, the valves at the bottom of each ribbon mixer 9 are opened, and the wet mixed material is placed on the first transmission device 10, and the wet mixed material is sent to the extruder 11 for extrusion molding; at the same time, the mixing bin 6 starts to send a new batch of mixed materials to the ribbon mixer 9, and the above wet mixing operation is repeated.

[0062] The drying unit includes: a drying box 12 connected to the output end of the second transmission device 15, and a third transmission device 16 arranged below the output end of the drying box 12. The extruder 11 extrudes the shaped particles, which are sent to the drying box 12 through the second transmission device 15 for material drying; a double-layer transmission mechanism is arranged in the drying box, which can realize continuous feeding and discharging of materials and ensure the drying temperature and time of the shaped particles. Among them: the double-layer transmission mechanism can adopt a double-layer belt conveyor mechanism.

[0063] The finished product storage unit includes: a second bucket elevator 14 provided at the output end of the third transmission device 16, and a finished product bin 13 connected to the second bucket elevator 14. The dried shaped particles are sent to the finished product bin 13 for storage through the third transmission device 16 and the bucket elevator. Furthermore, a packaging mechanism can be provided below the finished product bin 13, so that the shaped particles can directly fall from the bottom outlet of the finished product bin 13 into the packaging mechanism for packaging.

[0064] Wherein: the first transmission device 10, the second transmission device 15, and the third transmission device 16 can be belt conveyors.

[0065] It should be clear that the present invention is not limited to the specific structures and processes described above and shown in the figures. For the sake of simplicity, a detailed description of the known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0066] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0067] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A continuous preparation method of a granular calcium-based desulfurizer, characterized in that: include: Ingredient grinding and dry mixing: the raw materials are ground and mixed in a certain proportion, and the resulting mixture is sent to the wet mixing unit; Wet mixing: adding water to the mixture for wet mixing, and sending the wet mixture into the extrusion unit; Extrusion: The wet mixture is extruded into shape and the formed particles are fed into the drying unit; Drying: The formed particles are dried and sent to the finished product storage unit; Finished product storage: The dried granules are sent to the finished product warehouse.

2. The continuous preparation method of granular calcium-based desulfurizing agent according to claim 1, characterized in that: Ingredient grinding and dry mixing: The raw materials are fed from the raw material bin to the scraper conveyor according to a certain proportion through the first spiral feeder scale, and then enter the ball mill through the scraper conveyor for grinding and preliminary mixing; Wet mixing: The mixed material is sent from the output end of the ball mill to the mixing bin through the first bucket elevator, and then from the mixing bin to each screw kneader through the second screw feeder scale. At the same time, water is added to each screw kneader through the water metering scale for wet mixing; Extrusion: After a certain period of wet mixing, the valve at the bottom of each ribbon mixer is opened, the wet mixed material is placed on the first transmission device, and the wet mixed material is sent to the extruder for extrusion molding; Drying: The extruder extrudes the shaped particles and sends them to the drying box through the second transmission device for drying; Finished product storage: The dried granules are sent to the finished product warehouse for storage through the third transmission device and bucket elevator.

3. A continuous preparation device for granular calcium-based desulfurizing agent, characterized in that: include: The batching, grinding and dry mixing unit is used to grind and mix the raw materials in a certain proportion, and send the obtained mixture to the wet mixing unit; A wet mixing unit is used to add water to the mixed material for wet mixing, and to feed the wet mixed material into the extrusion unit; The extrusion unit is used to extrude the wet mixture into shapes and send the shaped particles into the drying unit; A drying unit, used to dry the formed particles and then send them to a finished product storage unit; The finished product storage unit is used to deliver the dried shaped particles to the finished product bin.

4. The continuous preparation equipment of granular calcium-based desulfurizing agent according to claim 3, characterized in that: The batching, grinding and dry mixing unit comprises: a plurality of raw material bins, a scraper conveyor, and a ball mill; The output end of each raw material bin is connected to a corresponding first spiral feeder scale, the scraper conveyor is arranged below the first spiral feeder scale, and the output end of the scraper conveyor is connected to the input end of the ball mill.

5. The continuous preparation equipment of granular calcium-based desulfurizing agent according to claim 4, characterized in that: The wet mixing unit comprises: a first bucket elevator, a mixing bin, a water tank, and a plurality of ribbon kneaders; The input end of the mixing bin is connected to the output end of the ball mill via the first bucket elevator, the output end of the mixing bin is connected to the input ends of multiple ribbon kneaders via the second spiral feeding scale, the water outlet end of the water tank is connected to the input ends of multiple ribbon kneaders via the water metering scale, and a first transmission device is provided below the output ends of the multiple ribbon kneaders.

6. The continuous preparation equipment for granular calcium-based desulfurizing agent according to claim 5, characterized in that: The extrusion unit comprises: an extruder connected to the output end of the first transmission device, and a second transmission device arranged below the output end of the extruder.

7. The continuous preparation equipment for granular calcium-based desulfurizing agent according to claim 6, characterized in that: The drying unit comprises: a drying box connected to the output end of the second transmission device, and a third transmission device arranged below the output end of the drying box.

8. The continuous preparation equipment for granular calcium-based desulfurizing agent according to claim 7, characterized in that: A double-layer transmission mechanism is arranged in the drying box.

9. The continuous preparation equipment for granular calcium-based desulfurizing agent according to claim 6, characterized in that: The finished product storage unit comprises: a second bucket elevator arranged at the output end of the third transmission device, and A finished product bin connected to the second bucket elevator.

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