Flue gas circulating fluidized bed desulfurization and dust removal system
By using devices such as large ash hoppers and fluidizing plates in the flue gas circulating fluidized bed desulfurization system, the problems of high energy consumption and large footprint have been solved, achieving a compact system and efficient desulfurization effect.
Patent Information
- Application Number
- CN202520331341.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Existing flue gas circulating fluidized bed desulfurization technology suffers from high energy consumption, large maintenance workload, and large equipment footprint.
The traditional long ash conveying equipment is replaced by a large ash hopper. Combined with fluidizing plates and pneumatic hammers, the outflow rate of desulfurization ash is increased, the maintenance workload of ash conveying equipment is reduced, and the system compactness is improved by connecting ash chambers and steam coils in parallel.
It reduces system energy consumption, reduces the maintenance workload of ash conveying equipment, and makes the system more compact, reducing the floor space required.
Smart Images
Figure CN223915065U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flue gas desulfurization and dust removal technology, specifically to a flue gas circulating fluidized bed desulfurization and dust removal system. Background Technology
[0002] Currently, hundreds of desulfurization technologies have been developed and applied both domestically and internationally. These desulfurization methods can be broadly classified into three categories: dry, semi-dry, and wet. Among them, the circulating fluidized bed (CFB) desulfurization process in dry desulfurization is widely used due to its high desulfurization efficiency and good stability. The desulfurizing agent used in the CFB flue gas desulfurization process is quicklime. After digestion, the quicklime produces calcium hydroxide, which participates in the desulfurization reaction within the desulfurization tower. This method consumes a large amount of quicklime, resulting in high costs. Furthermore, current technologies mostly handle the desulfurized ash by transporting it to an ash silo using ash conveying equipment, and then transporting it by truck for further processing. This process involves ash conveying equipment that can extend for several kilometers and requires external energy for transportation. The maintenance workload of the ash conveying equipment is large, and its energy consumption is high. Additionally, the subsequent ash silo occupies a large area, resulting in high energy consumption, a huge maintenance workload, and a large footprint for the entire system. Summary of the Invention
[0003] The purpose of this invention is to overcome the problems of high energy consumption, large maintenance workload, and large equipment footprint in existing flue gas desulfurization technologies, and to provide a flue gas circulating fluidized bed desulfurization and dust removal system. This system has a good desulfurization effect on flue gas, while reducing the workload of ash conveying equipment pipeline maintenance, reducing overall energy consumption, and making the overall system layout more compact, thus reducing the overall system footprint.
[0004] To achieve the above objectives, this utility model provides a flue gas circulating fluidized bed desulfurization and dust removal system, which includes: a desulfurizing agent silo, a desulfurization absorption tower, a dust collector, and a large ash hopper;
[0005] The desulfurizing agent silo, the desulfurization absorption tower, and the dust collector are connected in sequence.
[0006] The large ash hopper is connected to the dust collector;
[0007] The dust collector is connected to the desulfurization absorption tower;
[0008] A fluidizing plate is horizontally arranged at the bottom of the large ash hopper. The fluidizing plate has a cavity inside and several vertical ash guide pipes that penetrate the cavity.
[0009] The bottom of the fluidizing plate is provided with several air inlet pipes, all of which are connected to the cavity of the fluidizing plate.
[0010] Preferably, the dust collector includes at least two ash chambers connected in parallel, each of which is connected to the large ash hopper.
[0011] Preferably, the large ash hopper is further provided with a steam coil, which is spirally connected to the outer wall of the large ash hopper.
[0012] Preferably, the large ash hopper is further provided with multiple pneumatic hammers, which are evenly arranged on the outer side wall of the large ash hopper.
[0013] Preferably, the large ash hopper also includes an ash-pouring hole.
[0014] Preferably, the large ash hopper is also equipped with four level gauges at different heights relative to the bottom of the large ash hopper.
[0015] Preferably, the large ash hopper is also provided with four manual test holes at different heights relative to the bottom of the large ash hopper.
[0016] Preferably, the four manual test holes correspond one-to-one with the heights of the four level gauges.
[0017] Preferably, the large ash hopper is further provided with two pressure transmitters at different heights relative to the bottom of the large ash hopper.
[0018] Preferably, the system further includes a chimney connected to the dust collector.
[0019] Preferably, the system further includes a water tank connected to the desulfurization absorption tower.
[0020] Preferably, the system further includes a pre-electrostatic precipitator connected to the desulfurization absorption tower.
[0021] Compared with existing technologies, the flue gas circulating fluidized bed desulfurization and dust removal system of this utility model omits the traditional ash conveying equipment that is several kilometers long and the bulky ash storage silo. Instead, it directly uses the large ash hopper described in this utility model as a replacement. By setting the fluidizing plate described in this utility model inside the large ash hopper, the outflow speed of desulfurized ash is accelerated, and the resistance of ash discharge from the large ash hopper is reduced. At the same time, the system described in this utility model has a good desulfurization effect on flue gas, reduces the workload of ash conveying equipment pipeline maintenance, reduces overall energy consumption, and the overall system layout is more compact, reducing the overall system footprint. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of a flue gas circulating fluidized bed desulfurization and dust removal system according to a specific embodiment of this utility model;
[0023] Figure 2 This is a front cross-sectional view of a large ash hopper according to a specific embodiment of this utility model;
[0024] Figure 3 This is a front view of a fluidizing plate according to a specific embodiment of the present invention;
[0025] Figure 4 This is a top view of a fluidizing plate according to a specific embodiment of the present invention.
[0026] Explanation of reference numerals in the attached figures
[0027] 1. Desulfurizing agent silo 2. Desulfurization absorption tower
[0028] 3. Dust collector 4. Large ash hopper
[0029] 5. Chimney 6. Water tank
[0030] 7. Pre-electrostatic precipitator
[0031] 41 Fluidizing plate 410 Ash guide pipe
[0032] 411 intake pipe Detailed Implementation
[0033] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0034] The endpoints and any values of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of the various ranges, the endpoint values of the various ranges and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.
[0035] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.
[0036] Furthermore, terms such as "upper," "lower," "inner," and "outer" indicating orientation or positional relationships are based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0037] Furthermore, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0038] This utility model provides a flue gas circulating fluidized bed desulfurization and dust removal system, which includes: a desulfurizing agent silo 1, a desulfurization absorption tower 2, a dust collector 3, and a large ash hopper 4;
[0039] The desulfurizing agent silo 1, the desulfurization absorption tower 2, and the dust collector 3 are connected in sequence.
[0040] The large ash hopper 4 is connected to the dust collector 3;
[0041] The dust collector 3 is connected to the desulfurization absorption tower 2;
[0042] A fluidizing plate 41 is horizontally arranged at the bottom of the large ash hopper 4. The fluidizing plate 41 has a cavity inside and a plurality of vertical ash guiding pipes 410 that penetrate the cavity.
[0043] The bottom of the fluidizing plate 41 is provided with a plurality of air inlet pipes 411, and the air inlet pipes 411 are all connected to the cavity of the fluidizing plate 41.
[0044] In this invention, flue gas enters the desulfurization absorption tower 2 and reacts with the desulfurizing agent from the desulfurizing agent silo 1 to achieve desulfurization of the flue gas. The desulfurized flue gas then enters the dust collector 3 for dust removal, resulting in clean flue gas and desulfurization ash. The desulfurization ash is divided into two streams: one stream returns to the desulfurization absorption tower 2 for further desulfurization, while the other stream directly enters the large ash hopper 4 and is then transported by truck.
[0045] The flue gas circulating fluidized bed desulfurization and dust removal system described in this utility model can be used alone or multiple flue gas circulating fluidized bed desulfurization and dust removal systems can be used in parallel at the same time.
[0046] In a preferred embodiment, the dust collector 3 is connected to the desulfurization absorption tower 2 via a first fluidizing tank; the dust collector 3 is connected to the large ash hopper 4 via a second fluidizing tank.
[0047] In a preferred embodiment, the bottom of the large ash hopper 4 has two outlets: one outlet is used for transporting dry ash, and the other outlet is connected to a humidifying mixer for transporting wet ash.
[0048] In this invention, the airflow enters the cavity of the fluidizing plate 41 through the air inlet pipe 411, thereby causing the upper surface of the fluidizing plate 41 to vibrate. This facilitates the discharge of desulfurization ash from the large ash hopper 4 through the ash guide pipe 410, reduces the ash discharge resistance of the large ash hopper 4, and improves efficiency.
[0049] In a preferred embodiment, the upper surface of the fluidizing plate 41 is made of 304 stainless steel sintered wire mesh. Based on the characteristics of this material, such as high temperature resistance, corrosion resistance, high mechanical strength, high rigidity, long service life and high pore precision, the airflow entering the cavity of the fluidizing plate 41 is evenly distributed and the resistance loss is small, which has a better fluidization effect on the desulfurization ash in the large ash hopper 4.
[0050] In a preferred embodiment, in order to further improve the fluidization effect, the inner wall of the large ash hopper 4 is provided with the fluidization plate 41.
[0051] In a preferred embodiment, in order to improve the fluidization effect of the fluidizing plate 41, a plurality of the ash guide pipes 410 and a plurality of the air inlet pipes 411 are arranged in an array. Based on this, the airflow distribution is more uniform, and the desulfurization ash in the large ash hopper 4 is easier to discharge.
[0052] In a preferred embodiment, in order to improve dust removal efficiency, the dust collector 3 includes at least two ash chambers connected in parallel, and each ash chamber is connected to the large ash hopper 4.
[0053] In a specific implementation, in order to improve the dust removal effect on desulfurized flue gas, the dust collector 3 includes three ash chambers connected in parallel.
[0054] In a preferred embodiment, the large ash hopper 4 is further provided with a steam coil, which is spirally connected to the outer wall of the large ash hopper 4. Based on this, the steam coil can heat the large ash hopper 4, so that the heat of the desulfurized ash in the large ash hopper 4 will not be lost, and the desulfurized ash in the large ash hopper 4 will not cool and stick together, thereby improving the ash discharge efficiency of the desulfurized ash in the large ash hopper 4.
[0055] In a preferred embodiment, in order to further improve the ash discharge efficiency of the large ash hopper 4, the large ash hopper 4 is also provided with multiple pneumatic hammers. The multiple pneumatic hammers are evenly arranged on the outer side wall of the large ash hopper 4, thereby automatically preventing the desulfurization ash from adhering, clogging and bridging in the large ash hopper 4.
[0056] In a preferred embodiment, the large ash hopper 4 further includes an ash-removing hole. There are no special requirements for the location of the ash-removing hole. Preferably, the ash-removing hole is located at the lower part of the large ash hopper 4.
[0057] In a preferred embodiment, the large ash hopper 4 is further equipped with four level gauges at different heights relative to the bottom of the large ash hopper 4. Based on the height settings of the four level gauges, when the desulfurization ash in the large ash hopper 4 is at the height of the four level gauges, the level gauges will issue an alarm. Based on this, the height of the desulfurization ash in the large ash hopper 4 can be determined, and the ash storage status of the large ash hopper 4 can be accurately grasped, thereby avoiding the danger caused by excessive desulfurization ash in the large ash hopper 4, and also avoiding the situation of flue gas short circuit caused by insufficient desulfurization ash in the large ash hopper 4.
[0058] In a preferred embodiment, the large ash hopper 4 is further provided with four manual test holes at different heights relative to the bottom of the large ash hopper 4. The four manual test holes correspond one-to-one with the heights of the four level gauges. Based on the height settings of the four manual test holes, when the four level gauges issue an alarm, it can be verified through the four manual test holes, thereby reducing the occurrence of false alarms.
[0059] In a preferred embodiment, the large ash hopper 4 is further equipped with two pressure transmitters at different heights relative to the bottom of the large ash hopper 4. Based on the setting of the two pressure transmitters, the height of desulfurization ash in the large ash hopper 4 can be calculated. The results of the two pressure transmitters can be mutually verified, and can also be mutually verified with the results of the aforementioned four level gauges and four manual test holes, so as to more accurately grasp the ash storage status of the large ash hopper 4.
[0060] In a preferred embodiment, the system further includes a chimney 5 connected to the dust collector 3. The clean flue gas obtained after the desulfurized flue gas is removed by the dust collector 3 is discharged from the chimney 5, thereby reducing air pollution.
[0061] In a preferred embodiment, the system further includes a water tank 6, which is connected to the desulfurization absorption tower 2. The water tank 6 provides a water source for the desulfurization absorption tower 2, ensuring that the desulfurizing agent and flue gas react efficiently in the desulfurization absorption tower 2 and improving the desulfurization efficiency.
[0062] In a preferred embodiment, the system further includes a pre-electrostatic precipitator 7 connected to the desulfurization absorption tower 2; the flue gas first enters the pre-electrostatic precipitator 7 for pre-dust removal, and then enters the desulfurization absorption tower 2 for desulfurization treatment.
[0063] The following embodiments further illustrate the flue gas circulating fluidized bed desulfurization and dust removal system of this utility model. These embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operating procedures. However, the scope of protection of this utility model is not limited to the following embodiments.
[0064] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.
[0065] Example 1
[0066] This embodiment is implemented in the following system, with reference to [reference needed]. Figure 1 The system includes a desulfurizing agent silo 1, a desulfurization absorption tower 2, a dust collector 3, a large ash hopper 4, a chimney 5, a water tank 6, and a pre-electrostatic precipitator 7;
[0067] The pre-electrostatic precipitator 7, the desulfurization absorption tower 2, the dust collector 3, and the chimney 5 are arranged sequentially along the direction of flue gas flow.
[0068] Both the desulfurizing agent silo 1 and the water tank 6 are connected to the desulfurization absorption tower 2;
[0069] The dust collector 3 is connected to the desulfurization absorption tower 2 through a first fluidizing tank;
[0070] The dust collector 3 is connected to the large ash hopper 4 via a second fluidizing tank;
[0071] The dust collector 3 includes three parallel ash chambers;
[0072] See also Figure 2 The inner bottom and inner sidewall of the large ash hopper 4 are provided with fluidizing plates 41;
[0073] See also Figure 3 The bottom of the fluidizing plate 41 has an array of air inlet pipes 411.
[0074] See also Figure 4 The fluidizing plate 41 has ash guide tubes 410 arranged in an array;
[0075] The fluidizing plate 41 is equipped with a steam coil, which is spirally connected to the outer side wall of the large ash hopper 4.
[0076] The large ash hopper 4 is also equipped with 4 pneumatic hammers, which are evenly arranged on the outer side wall of the large ash hopper.
[0077] The lower part of the large ash hopper 4 is also provided with an ash-pouring hole;
[0078] The large ash hopper 4 is also equipped with four level gauges at different heights relative to the bottom of the large ash hopper, and four manual test holes corresponding to the heights of the four level gauges.
[0079] The large ash hopper 4 is also equipped with two pressure transmitters at different heights relative to the bottom of the large ash hopper.
[0080] The process flow in this system is as follows:
[0081] The two systems described above are connected in parallel to the boiler, and the flue gas generated by the boiler is divided into two streams and enters the systems described above for treatment respectively.
[0082] The flue gas enters the pre-electrostatic precipitator 7 for pre-dust removal, and then enters the desulfurization absorption tower 2 where it undergoes desulfurization treatment with desulfurizing agent from the desulfurizing agent silo 1 and water from the water tank 6. The desulfurized flue gas then enters the dust collector 3 for further dust removal, resulting in clean flue gas and desulfurization ash. The clean flue gas exits through the chimney 5, while the desulfurization ash is divided into two streams. One stream of desulfurization ash enters the desulfurization absorption tower 2 through the first fluidized bed for recycling, while the other stream enters the large-diameter chimney 5 through the second fluidized bed. The airflow enters the cavity of the fluidizing plate 41 through the air inlet pipe 411 of the large ash hopper 4, causing the upper end surface of the fluidizing plate 41 to vibrate, thereby accelerating the discharge of desulfurized ash from the large ash hopper 4 and improving the ash discharge efficiency. The steam coil can heat the large ash hopper 4, and the pneumatic hammer can strike the large ash hopper 4 to prevent the desulfurized ash in the large ash hopper 4 from sticking together. The height of the desulfurized ash in the large ash hopper 4 can be accurately controlled by the mutual verification of the four level gauges, four manual test holes and two pressure transmitters of the large ash hopper 4.
[0083] By treating the flue gas generated by the boiler in parallel using the system described in this utility model, the initial investment is effectively reduced by about 8 million yuan, the number of air compressors is reduced by 3, the plant power consumption rate is reduced by about 0.1%, and the maintenance workload of ash conveying pipeline wear and ash leakage is reduced.
[0084] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.
Claims
1. A flue gas circulating fluidized bed desulfurization and dust removal system, characterized in that, The system includes: a desulfurizing agent silo (1), a desulfurization absorption tower (2), a dust collector (3), and a large ash hopper (4); The desulfurizing agent silo (1), the desulfurization absorption tower (2), and the dust collector (3) are connected in sequence. The large ash hopper (4) is connected to the dust collector (3); The dust collector (3) is connected to the desulfurization absorption tower (2); The bottom of the large ash hopper (4) is horizontally provided with a fluidizing plate (41), the fluidizing plate (41) has a cavity inside, and the fluidizing plate (41) has a number of vertical ash guiding pipes (410) that penetrate the cavity. The bottom of the fluidizing plate (41) is provided with several air inlet pipes (411), and the air inlet pipes (411) are all connected to the cavity of the fluidizing plate (41).
2. The system according to claim 1, characterized in that, The dust collector (3) includes at least two parallel ash chambers, each of which is connected to the large ash hopper (4).
3. The system according to claim 1 or 2, characterized in that, The large ash hopper (4) is also equipped with a steam coil, which is spirally attached to the outer wall of the large ash hopper (4).
4. The system according to claim 3, characterized in that, The large ash hopper (4) is also equipped with multiple pneumatic hammers, which are evenly arranged on the outer side wall of the large ash hopper (4); and / or The large ash hopper (4) also includes an ash-pouring hole.
5. The system according to claim 1 or 4, characterized in that, The large ash hopper (4) is also equipped with four level gauges at different heights relative to the bottom of the large ash hopper (4); and / or The large ash hopper (4) is also provided with four manual test holes at different heights relative to the bottom of the large ash hopper (4).
6. The system according to claim 5, characterized in that, The four manual test holes correspond one-to-one with the heights of the four level gauges.
7. The system according to claim 1 or 6, characterized in that, The large ash hopper (4) is also equipped with two pressure transmitters at different heights relative to the bottom of the large ash hopper (4).
8. The system according to claim 7, characterized in that, The system also includes a chimney (5) connected to the dust collector (3).
9. The system according to claim 1 or 8, characterized in that, The system also includes a water tank (6) connected to the desulfurization absorption tower (2).
10. The system according to claim 1 or 9, characterized in that, The system also includes a pre-electrostatic precipitator (7) connected to the desulfurization absorption tower (2).