Resource utilization system for calcium-based ultrafine powder desulfurization by-products

Abstract

The utility model discloses a calcium-based ultrafine powder desulfurization by-product resource utilization system. Comprising a storage system and a slurry preparation system, wherein the storage system comprises a storage bin body (2) and a bag type dust collector (3); the upper part of the storage bin body (2) is connected with the feeding device (1); the slurry preparation system comprises a slurry preparation tank (9), a slurry tank (15) and a clarification tank (19); the slurry preparation tank (9) is connected with a slurry tank (15) through a slurry transfer pump (13) and a filtering device (14); the slurry preparation tank (9) is connected with a clarification tank (19) through a communication device (18); the lower part of the storage bin body (2) is connected with a slurry preparation pool (9) through a pipeline; a manual gate valve (7) and a conveying and metering device (8) are arranged on a connecting pipeline between the storage bin body (2) and the slurry preparation pool (9). According to the utility model, calcium-based ultrafine powder desulfurization byproducts and wet desulfurization are subjected to cooperative treatment, so that waste is turned into wealth.

Description

Technical Field

[0001] This utility model relates to the field of resource utilization technology of flue gas desulfurization byproducts, specifically to a calcium-based ultrafine powder desulfurization byproduct resource utilization system. Background Technology

[0002] Calcium-based ultrafine powder desulfurization technology is widely used in low-sulfur flue gas from coke ovens, steel rolling heating furnaces, blast furnace hot blast stoves, and gas-fired boilers because of its wide availability of raw materials, simple process flow, low initial investment, simple maintenance, and the fact that desulfurization byproducts are slightly soluble in water and easy to store.

[0003] The main component of calcium-based ultrafine powder is Ca(OH)2. Its chemical properties and direct injection desulfurization method determine its Ca / S ratio. Due to the problem of low desulfurizer utilization, excessive desulfurizer is often injected during the desulfurization process to ensure desulfurization efficiency.

[0004] The composition of calcium-based ultrafine powder desulfurization varies depending on the properties of the flue gas being treated. CaSO4 and CaSO3 account for 30-35%, while unreacted Ca(OH)2 and CaCO3 generated from the reaction with the flue gas account for 45-55%. Other components account for about 10% (CaCl2, CaF2, Fe, Al oxides and sodium salts).

[0005] The composition and purity of this by-product do not meet the requirements of the cement industry for industrial by-product gypsum and cement admixtures. Currently, most of these by-products are disposed of by backfilling or stockpiling.

[0006] In flue gas desulfurization processes with high SO2 concentrations, calcium-based wet desulfurization technology has always been dominant. Its desulfurizing agent uses CaCO3 suspension or Ca(OH)2 suspension. Through a series of processes such as oxidation and dehydration, the by-product of this process is high-purity industrial gypsum, which meets the requirements of industrial by-product gypsum in the building materials industry. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by providing a system for the resource utilization of calcium-based ultrafine powder desulfurization byproducts. After pretreatment, the calcium-based ultrafine powder desulfurization byproducts can be directly applied to calcium-based wet desulfurization systems. Through synergistic treatment with wet desulfurization systems, the calcium-based ultrafine powder desulfurization byproducts can be effectively processed, turning waste into treasure.

[0008] The technical solution of this utility model is: a resource utilization system for calcium-based ultrafine powder desulfurization byproducts, including a storage system and a slurry preparation system. The storage system includes a storage silo and a bag filter, with the bag filter located at the top of the storage silo. A feeding device is connected to the top of the storage silo. The slurry preparation system includes a slurry preparation tank, a slurry pool, and a clarification tank. The slurry preparation tank is connected to the slurry pool via a slurry transfer pump and a filtration device. The slurry preparation tank is connected to the clarification tank via a connecting device. The clarification tank is connected to the slurry preparation tank or a wastewater treatment system via a filtrate pump. The lower part of the storage silo is connected to the slurry preparation tank via a pipeline. A manual gate valve and a conveying and metering device are installed on the connecting pipeline between the storage silo and the slurry preparation tank.

[0009] Furthermore, a pressure reducing device and a material level measuring device are installed on the upper part of the storage silo.

[0010] Furthermore, the storage silo body has a fluidization device at the bottom.

[0011] Furthermore, the slurry preparation tank includes a stirring device, a slag discharge device, and a liquid level measuring device; an electric valve is installed on the pipeline connecting the filtrate pump to the slurry preparation tank, and the electric valve and the liquid level measuring device are interlocked with the conveying and metering device.

[0012] Furthermore, the slurry tank includes a filtration device and a stirring device, and the slurry tank is connected to a slurry delivery pump, which delivers the slurry to the wet desulfurization system.

[0013] Furthermore, an air-blocking device is installed on the connecting pipe between the conveying and metering device and the slurry preparation tank.

[0014] Furthermore, the slurry transfer pump, slurry delivery pump, and filtrate pump are submersible pumps or horizontal centrifugal pumps.

[0015] Furthermore, the feeding device is a pneumatic conveying device or a mechanical feeding device.

[0016] Furthermore, the conveying and metering device is a double-tube screw scale.

[0017] Furthermore, the slag discharge device adopts a double-pipe spiral and is equipped with a flushing device.

[0018] This system includes a series of processes such as metering, pulping, slag removal, filtration, and clarification. Calcium-based ultrafine powder desulfurization byproducts are introduced into a pulping tank in proportion to process water or filtrate. Inside the tank, a stirrer generates slurries of varying concentrations and compositions. Qualified slurries are extracted through separate treatment of the slurries in different layers. The bottom layer of insoluble matter is discharged via a slag remover, the middle layer suspension is transferred to a slurry tank via a transfer pump and filtration device, and the surface clear liquid overflows into a clarification tank for natural sedimentation. The slurry from the slurry tank can be pumped to the wet desulfurization tower for pH adjustment. The clear liquid from the clarification tank can be pumped back to the pulping tank for reuse. Depending on the concentration of Cl ions in the filtrate, it can also be sent to the wastewater treatment system in the wet desulfurization process.

[0019] The beneficial technical effects of this utility model are: it co-processes calcium-based ultrafine powder desulfurization byproducts with wet desulfurization, turning waste into treasure; by combining the slurry preparation tank, slurry tank and clarification tank, the functional areas of desulfurization byproduct washing, slag discharge, slurry preparation and slag discharge are integrated together, reducing the floor space required; by utilizing the stratified nature of the calcium-based ultrafine powder desulfurization byproduct slurry, the problem of complex processes and numerous equipment in desulfurization byproduct treatment is solved by stratifying the suspension; and by co-processing with the slurry preparation, oxidation, dewatering and wastewater treatment of the calcium-based wet desulfurization system, the problem of wastewater treatment during the byproduct treatment process is solved. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a calcium-based ultrafine powder desulfurization byproduct resource utilization system.

[0021] In the diagram: 1-Feeding device, 2-Storage silo body, 3-Bag dust collector, 4-Pressure reducing device, 5-Material level measuring device, 6-Fluidization device, 7-Manual slide gate valve, 8-Conveying and metering device, 9-Slurry preparation tank, 10-Preparation tank agitator, 11-Slag discharge device, 12-Level gauge, 13-Slurry transfer pump, 14-Filtering device, 15-Slurry tank, 16-Slurry tank agitator, 17-Slurry transfer pump, 18-Connecting device, 19-Clarifying tank, 20-Filtration pump, 21-Electric valve, 22-Flow meter. Detailed Implementation

[0022] To make the purpose and technical solution of this utility model clearer, the utility model will be further described below in conjunction with the system structure diagram and embodiments.

[0023] The desulfurization byproduct is a calcium-based ultrafine powder desulfurization product, the raw material of which is calcium-based ultrafine powder, and it is mainly used in low-sulfur flue gas desulfurization processes.

[0024] The main components of the desulfurization byproducts are Ca(OH)2, CaCO3, CaSO4 and CaSO3, and the mass ratio of the above main calcium-based compounds is not less than 85-90%.

[0025] like Figure 1 A system for the resource utilization of calcium-based ultrafine powder desulfurization byproducts includes a storage system and a slurry preparation system. The storage system includes a storage silo body 2 and a bag filter 3, with the bag filter 3 located on the upper part of the storage silo body 2. A feeding device 1 is connected to the upper part of the storage silo body 2. The slurry preparation system includes a slurry preparation tank 9, a slurry pool 15, and a clarification tank 19. The slurry preparation tank 9 is connected to the slurry pool 15 via a slurry transfer pump 13 and a filter device 14. The slurry preparation tank 9 is connected to the clarification tank 19 via a connecting device 18. The clarification tank 19 is connected to the slurry preparation tank 9 or a wastewater treatment system via a filtrate pump 20. The lower part of the storage silo body 2 is connected to the slurry preparation tank 9 via a pipeline. A manual gate valve 7 and a conveying and metering device 8 are installed on the connecting pipeline between the storage silo body 2 and the slurry preparation tank 9.

[0026] The upper part of the storage silo 2 is equipped with a pressure reducing device 4 and a material level measuring device 5.

[0027] A fluidizing device 6 is installed at the lower part of the storage silo body 2 to ensure smooth material flow.

[0028] The slurry preparation tank 9 includes a stirring device 10, a slag discharge device 11, and a liquid level measuring device 12; the filtrate pump 20 is connected to the pipeline of the slurry preparation tank 9 and is equipped with an electric valve 21 and a flow meter 22. The electric valve 21 and the liquid level measuring device 12 are interlocked with the conveying and metering device 8.

[0029] The slurry tank 15 includes a filtration device 14 and a stirring device 16. The slurry tank 15 is connected to a slurry delivery pump 17, which delivers the slurry to the wet desulfurization system.

[0030] The connecting pipe between the conveying and metering device 8 and the slurry preparation tank 9 is equipped with an air-blocking device to prevent water vapor in the slurry preparation tank 9 from entering the conveying and metering device 8.

[0031] The slurry transfer pump 13, slurry delivery pump 17, and filtrate pump 20 are either submersible pumps or horizontal centrifugal pumps.

[0032] The feeding device 1 is a pneumatic conveying device or a mechanical feeding device.

[0033] The conveying and metering device 8 is a double-tube spiral scale. The upper spiral is equipped with a purpose lock to prevent the calcium-based ultrafine powder desulfurization by-products from being pushed into the material. The lower spiral is equipped with a metering device to measure the amount of calcium-based ultrafine powder desulfurization by-products being fed into the material.

[0034] The slurry preparation tank 9 is equipped with a level gauge 12.

[0035] The slag discharge device 11 adopts a double-pipe spiral and is equipped with a flushing device.

[0036] The present patent has been described in detail above with reference to the accompanying drawings and embodiments. However, the present patent is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present patent without departing from the spirit and scope of the claims. All of these are within the protection scope of the present patent.

Claims

1. A system for the resource utilization of calcium-based ultrafine powder desulfurization byproducts, characterized in that: The system includes a storage system and a slurry preparation system. The storage system includes a storage silo (2) and a bag filter (3). The bag filter (3) is located on the upper part of the storage silo (2). A feeding device (1) is connected to the upper part of the storage silo (2). The slurry preparation system includes a slurry preparation tank (9), a slurry pool (15), and a clarification tank (19). The slurry preparation tank (9) is connected to the slurry pool (15) via a slurry transfer pump (13) and a filter device (14). The slurry preparation tank (9) is connected to the clarification tank (19) via a connecting device (18). The clarification tank (19) is connected to the slurry preparation tank (9) or a sewage treatment system via a filtrate pump (20). The lower part of the storage silo (2) is connected to the slurry preparation tank (9) via a pipe. A manual gate valve (7) and a conveying metering device (8) are installed on the connecting pipe between the storage silo (2) and the slurry preparation tank (9).

2. The calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, characterized in that: The upper part of the storage silo body (2) is equipped with a pressure reducing device (4) and a material level measuring device (5).

3. The calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, characterized in that: A fluidization device (6) is installed at the bottom of the storage tank body (2).

4. The calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, characterized in that: The slurry preparation tank (9) includes a preparation tank agitator (10), a slag discharge device (11), and a liquid level measuring device (12); the filter pump (20) is connected to the pipeline of the slurry preparation tank (9) and an electric valve (21) is installed on it. The electric valve (21) and the liquid level measuring device (12) are interlocked with the conveying metering device (8).

5. The calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, characterized in that: The slurry tank (15) includes a filter device (14) and a slurry tank agitator (16). The slurry tank (15) is connected to a slurry delivery pump (17) and the slurry is delivered to the wet desulfurization system through the slurry delivery pump (17).

6. The calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, characterized in that: An air-blocking device is installed on the connecting pipe between the conveying and metering device (8) and the slurry preparation tank (9).

7. A calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, 4, or 5, characterized in that: The slurry transfer pump (13), slurry delivery pump (17), and filtrate pump (20) are either submersible pumps or horizontal centrifugal pumps.

8. The calcium-based ultrafine powder desulfurization by-product resource utilization system according to claim 1, characterized in that: The feeding device (1) is a pneumatic conveying device or a mechanical feeding device.

9. A system for the resource utilization of calcium-based ultrafine powder desulfurization byproducts according to claim 1, characterized in that: The conveying and metering device (8) is a double-tube spiral scale.

10. A system for the resource utilization of calcium-based ultrafine powder desulfurization byproducts according to claim 4, characterized in that: The slag discharge device (11) adopts a double-pipe spiral and is equipped with a flushing device.

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