An optimized device for rotary spray drying desulfurization process

Abstract

This utility model relates to the field of desulfurization technology, specifically to an optimized device for a rotary spray drying desulfurization process. It includes a head electrostatic precipitator and a water tank. The inlet pipe of the head electrostatic precipitator is connected to a sintering flue gas inlet pipe, and the outlet pipe of the water tank is connected to a slurry tank. A heat exchange component is connected between the head electrostatic precipitator and the water tank. A desulfurization component is connected to the heat exchange component via a pipe. A slurry preparation component is connected between the desulfurization component and the slurry tank via a pipe. The beneficial effects of this utility model are: by utilizing high-temperature sintering flue gas for heat exchange, the slurry water is heated and then prepared into a slurry, raising the slurry temperature to 65-70℃. Atomized desulfurization is then performed using the high-temperature slurry, increasing the reaction temperature and spray volume. This ensures compliant emissions while maximizing the recycling of desulfurization ash and reducing the amount of desulfurizing agent used, thereby improving the economic efficiency of the desulfurization process.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization technology, specifically to an optimized device for a rotary spray drying desulfurization process. Background Technology

[0002] The absorbents in rotary spray drying desulfurization technology are mainly quicklime and slaked lime, with quicklime (CaO) generally used as the absorbent. After being digested, the quicklime is combined with recycled desulfurization byproducts to form slaked lime slurry (Ca(OH)2). The digestion process is controlled at a suitable temperature (90-100℃), resulting in slaked lime slurry (containing 25%-30% solids) with very high activity. The temperature of the slaked lime slurry is generally 50-55℃. The quicklime slurry is pumped to the rotary atomizer at the top of the absorption tower. Under the high-speed rotation of the atomizing wheel at nearly 10,000 rpm, the slurry is atomized into hundreds of millions of 50µm droplets. When the untreated hot flue gas enters the absorption tower, it immediately comes into contact with the strongly alkaline absorbent droplets. The acidic components (HCl, HF, SO2, SO3) in the flue gas are absorbed, and at the same time, the moisture in the droplets is evaporated, turning into dry desulfurization products.

[0003] A small amount of these dried products are discharged directly from the bottom of the absorption tower, while most are collected in the dust collector after entering the absorption tower with the flue gas. They are then transported mechanically or pneumatically, and the treated clean flue gas is discharged through the chimney.

[0004] In general, SDA's dust removal and desulfurization ash is simply reused in various scenarios by being sprayed back into the desulfurization tower in powder form to maximize desulfurization utilization. However, this technology has certain limitations. Since the normal reaction between the atomized slurry and flue gas in the desulfurization tower is a gas-liquid reaction with relatively high efficiency, the addition of solid powder desulfurization ash reduces the efficiency of the gas-liquid reaction with the desulfurization ash because the effective quicklime content in the desulfurization ash is more than 50% lower than that in the slurry. This fails to achieve the original goal of recycling desulfurization ash and reducing desulfurization agent usage.

[0005] Therefore, it is necessary to invent an optimized device for the rotary spray drying desulfurization process. Summary of the Invention

[0006] Therefore, this utility model provides an optimized device for the rotary spray drying desulfurization process. By optimizing the utilization of desulfurization ash, it maximizes the recycling of desulfurization ash while ensuring the normal desulfurization reaction efficiency in the desulfurization tower, thereby reducing the amount of desulfurizing agent used and improving the economic efficiency of the desulfurization process, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an optimized device for a rotary spray drying desulfurization process, comprising a head electrostatic precipitator and a water tank, wherein the inlet pipe of the head electrostatic precipitator is connected to a sintering flue gas inlet pipe, the outlet pipe of the water tank is connected to a slurry tank, a heat exchange component is connected between the head electrostatic precipitator and the water tank, a desulfurization component is connected between the heat exchange component and the desulfurization component, and a slurry preparation component is connected between the desulfurization component and the slurry tank.

[0008] Preferably, the heat exchange assembly includes a heat exchanger, the cold medium inlet flange of the heat exchanger is connected to a cold slurry water inlet pipe, the hot medium inlet flange of the heat exchanger is connected to a high-temperature flue gas conveying pipe, and the high-temperature flue gas conveying pipe is fixedly connected to the outlet end of the electrostatic precipitator at the machine head.

[0009] Preferably, the heat exchanger's hot medium outlet flange is connected to a hot slurry water conveying pipe, the hot slurry water conveying pipe is fixedly connected to the water inlet of the water tank, and the heat exchanger's cold medium outlet flange is connected to a low-temperature flue gas conveying pipe.

[0010] Preferably, the desulfurization assembly includes a desulfurization tower, the low-temperature flue gas conveying pipe is fixedly connected to the gas inlet of the desulfurization tower, the desulfurization tower pipe is connected to a top tank, the feed end of the top tank is connected to a slurry tank pipe, a rotary atomizer is fixed inside the desulfurization tower, and the discharge end of the top tank is connected to the rotary atomizer pipe.

[0011] Preferably, the outlet pipe of the desulfurization tower is connected to a bag filter, and the bag filter pipe is connected to a chimney.

[0012] Preferably, the pulping assembly includes a desulfurization ash conveying pipe, which is fixedly connected to the bottom of the desulfurization tower. A desulfurization ash branch pipe is fixedly connected to the bottom of the bag filter. The desulfurization ash branch pipe is fixedly connected to the body of the desulfurization ash conveying pipe. A desulfurization ash storage tank is fixedly connected to the desulfurization ash conveying pipe. The desulfurization ash storage tank is connected to the slurry tank pipeline.

[0013] Preferably, the pulping assembly further includes a quicklime storage tank, which is connected to the slurry tank via a pipeline.

[0014] The beneficial effects of this utility model are as follows: by using the electrostatic precipitator at the machine head, water tank, sintering flue gas inlet pipe, slurry tank, heat exchange components, desulfurization components and slurry preparation components in combination, the slurry is heated by heat exchange with high-temperature sintering flue gas and then slurryed, raising the temperature of the slurry to 65-70℃. The high-temperature slurry is then used for atomized desulfurization, increasing the reaction temperature and spray volume. This ensures that emissions meet standards while maximizing the recycling of desulfurization ash and reducing the amount of desulfurizing agent used, thereby improving the economic efficiency of the desulfurization process. Attached Figure Description

[0015] Figure 1The system structure diagram provided for this utility model.

[0016] In the diagram: 1. Electrostatic precipitator at the machine head; 2. Water tank; 3. Sintering flue gas inlet pipe; 4. Slurry tank; 5. Heat exchanger; 6. Cold slurry water inlet pipe; 7. High-temperature flue gas conveying pipe; 8. Hot slurry water conveying pipe; 9. Low-temperature flue gas conveying pipe; 10. Desulfurization tower; 11. Top tank; 12. Rotary atomizer; 13. Bag filter; 14. Chimney; 15. Desulfurization ash conveying pipe; 16. Desulfurization ash branch pipe; 17. Desulfurization ash storage tank; 18. Quicklime storage tank. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] Please refer to the appendix. Figure 1 This utility model provides an optimized device for a rotary spray drying desulfurization process, including a head electrostatic precipitator 1 and a water tank 2. The inlet pipe of the head electrostatic precipitator 1 is connected to a sintering flue gas inlet pipe 3. It should be noted that the head electrostatic precipitator is a high-efficiency dust removal device for treating fine particulate matter in industrial flue gas. It is mainly used in high-difficulty dust removal scenarios such as the head of a sintering machine. Its core is to charge the dust particles through a high-voltage electric field, and then adsorb them onto the electrodes to achieve separation, ultimately discharging the clean gas. That is, the high-temperature sintering flue gas can first enter the head electrostatic precipitator. Inside 1, particulate matter in the high-temperature sintering flue gas is removed, thereby significantly reducing the amount of dust emitted into the atmosphere. The outlet pipe of water tank 2 is connected to slurry tank 4 for storing the prepared slurry. It should be noted that a water pump (not shown in the figure) is fixedly connected to the pipe between water tank 2 and slurry tank 4 to pump the slurry water in water tank 2 into slurry tank 4. A heat exchange component is connected between the electrostatic precipitator 1 at the machine head and water tank 2. The heat exchange component is connected to a desulfurization component. The desulfurization component is connected to the slurry tank 4 via a pipe. The heat exchange assembly includes heat exchanger 5. The cold medium inlet flange of heat exchanger 5 is connected to a cold slurry water inlet pipe 6. It should be noted that a water pump (not shown in the figure) is fixedly connected to the cold slurry water inlet pipe 6 for pumping the cold slurry water. The hot medium inlet flange of heat exchanger 5 is connected to a high-temperature flue gas delivery pipe 7. The high-temperature flue gas delivery pipe 7 is fixedly connected to the outlet end of the electrostatic precipitator 1 at the machine head. It should be noted that a fan (not shown in the figure) is fixedly connected to the high-temperature flue gas delivery pipe 7 for transporting flue gas. The hot medium outlet flange of heat exchanger 5 is connected to… Hot slurry water conveying pipe 8 is fixedly connected to the water inlet of water tank 2. The cold medium outlet flange of heat exchanger 5 is connected to low temperature flue gas conveying pipe 9. Specifically, under the heat exchange action of heat exchanger 5, the slurry water can be heated by using high temperature sintering flue gas for heat exchange and then slurry making, thereby raising the temperature of the slurry to 65-70℃. The low temperature sintering flue gas after heat exchange enters the desulfurization tower 10 through the low temperature flue gas conveying pipe 9 for desulfurization operation. The high temperature slurry water after heat exchange enters the water tank 2 through hot slurry water conveying pipe 8. The desulfurization assembly includes a desulfurization tower 10, a low-temperature flue gas conveying pipe 9 fixedly connected to the inlet of the desulfurization tower 10, a top tank 11 connected to the desulfurization tower 10, and a slurry tank 4 connected to the top tank 11 by a pipe. It should be noted that a pump body (not shown in the figure) is connected between the top tank 11 and the slurry tank 4 to pump the prepared slurry into the top tank 11. A rotary atomizer 12 is fixed inside the desulfurization tower 10, and the discharge end of the top tank 11 is connected to the rotary atomizer 12 by a pipe. It should be noted that a pump body (not shown in the figure) is connected between the discharge end of the top tank 11 and the rotary atomizer 12 by a pipe. (Not shown in the drawing) is used to pump the prepared high-temperature slurry to the rotary atomizer 12, and then spray it into the desulfurization tower 10 through the rotary atomizer 12. The outlet pipe of the desulfurization tower 10 is connected to the bag filter 13, and the bag filter 13 is connected to the chimney 14. Specifically, desulfurization can be carried out by atomization of high-temperature slurry, which increases the reaction temperature and spray water volume, ensures that the emission meets the standards, maximizes the recycling of desulfurization ash, reduces the amount of desulfurizing agent used, and improves the economy of the desulfurization process. The desulfurized gas is discharged from the chimney 14 after being dusted again by the bag filter 13. The pulping assembly includes a desulfurization ash conveying pipe 15, which is fixedly connected to the bottom of the desulfurization tower 10. A desulfurization ash branch pipe 16 is fixedly connected to the bottom of the bag filter 13. The desulfurization ash branch pipe 16 is fixedly connected to the body of the desulfurization ash conveying pipe 15. A desulfurization ash storage tank 17 is fixedly connected to the desulfurization ash conveying pipe 15. The desulfurization ash storage tank 17 is connected to the slurry tank 4 via a pipeline. The pulping assembly also includes a quicklime storage tank 18, which is connected to the slurry tank 4 via a pipeline. It should be noted that the desulfurization ash storage tank 17 can be used to collect the dust after desulfurization by the desulfurization tower 10 and the dust collected in the bag filter 13, and then recycle and add it to the slurry tank 4 via a pipeline. The quicklime stored in the quicklime storage tank 18 is also added to the slurry tank 4 via a pipeline.

[0019] The usage process of this utility model is as follows: After the high-temperature sintering flue gas is initially removed by the electrostatic precipitator 1 at the machine head, it is transported to the heat exchanger 5 through the high-temperature flue gas conveying pipe 7. The cold slurry water is pumped into the heat exchanger 5 through the cold slurry water inlet pipe 6 to exchange heat with the high-temperature sintering flue gas. The low-temperature sintering flue gas after heat exchange enters the desulfurization tower 10 through the low-temperature flue gas conveying pipe 9 for desulfurization. The high-temperature slurry water after heat exchange enters the water tank 2 through the hot slurry water conveying pipe 8, and is then pumped to the top tank 11. Finally, the prepared high-temperature slurry is pumped to the rotary atomizer 12, and then atomized and sprayed into the desulfurization tower 10 to desulfurize the low-temperature sintering flue gas after heat exchange. The desulfurized gas is then removed by the bag filter 13 again and discharged through the chimney 14. The dust after desulfurization by the desulfurization tower 10 and the dust collected in the bag filter 13 can be collected by the desulfurization ash storage tank 17, then recycled and added to the slurry tank 4 through a pipeline. The quicklime stored in the quicklime storage tank 18 is also added to the slurry tank 4 through a pipeline, and the slurry is prepared in combination with the heat-exchanged hot slurry water. Therefore, this optimized device can use high-temperature sintering flue gas for heat exchange to heat the pulping water and then pulp it, raising the temperature of the slurry to 65-70℃. The high-temperature slurry is then used for atomized desulfurization, increasing the reaction temperature and spray volume. This ensures that emissions meet standards while maximizing the recycling of desulfurization ash and reducing the amount of desulfurizing agent used, thereby improving the economic efficiency of the desulfurization process.

Claims

1. An optimized device for a rotary spray drying desulfurization process, comprising a head electrostatic precipitator (1) and a water tank (2), wherein the inlet pipe of the head electrostatic precipitator (1) is connected to a sintering flue gas inlet pipe (3), and the outlet pipe of the water tank (2) is connected to a slurry tank (4), characterized in that: A heat exchange component is connected between the electrostatic precipitator (1) at the machine head and the water tank (2) via a pipeline. A desulfurization component is connected to the heat exchange component via a pipeline. A slurry preparation component is connected between the desulfurization component and the slurry tank (4) via a pipeline.

2. The optimized device for a rotary spray drying desulfurization process according to claim 1, characterized in that: The heat exchange assembly includes a heat exchanger (5), the cold medium inlet flange of the heat exchanger (5) is connected to a cold pulping water inlet pipe (6), the hot medium inlet flange of the heat exchanger (5) is connected to a high temperature flue gas conveying pipe (7), and the high temperature flue gas conveying pipe (7) is fixedly connected to the outlet end of the electrostatic precipitator (1) at the machine head.

3. The optimized device for a rotary spray drying desulfurization process according to claim 2, characterized in that: The heat exchanger (5) has a hot medium outlet flange connected to a hot slurry water conveying pipe (8), which is fixedly connected to the water inlet of the water tank (2). The heat exchanger (5) has a cold medium outlet flange connected to a low temperature flue gas conveying pipe (9).

4. The optimized device for a rotary spray drying desulfurization process according to claim 3, characterized in that: The desulfurization assembly includes a desulfurization tower (10), the low-temperature flue gas conveying pipe (9) is fixedly connected to the air inlet end of the desulfurization tower (10), the desulfurization tower (10) is connected to a top tank (11), the feed end of the top tank (11) is connected to a slurry tank (4), a rotary atomizer (12) is fixed inside the desulfurization tower (10), and the discharge end of the top tank (11) is connected to the rotary atomizer (12).

5. The optimized device for a rotary spray drying desulfurization process according to claim 4, characterized in that: The outlet pipe of the desulfurization tower (10) is connected to a bag filter (13), and the bag filter (13) is connected to a chimney (14).

6. The optimized device for a rotary spray drying desulfurization process according to claim 5, characterized in that: The slurry preparation assembly includes a desulfurization ash conveying pipe (15), which is fixedly connected to the bottom of the desulfurization tower (10). The bottom of the bag filter (13) is fixedly connected to a desulfurization ash branch pipe (16), which is fixedly connected to the body of the desulfurization ash conveying pipe (15). The desulfurization ash conveying pipe (15) is fixedly connected to a desulfurization ash storage tank (17), which is pipe-connected to the slurry tank (4).

7. An optimized device for a rotary spray drying desulfurization process according to claim 6, characterized in that: The pulping assembly also includes a quicklime storage tank (18), which is pipe-connected to the slurry tank (4).

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