Recycling equipment for desulfurization waste ash and dry desulfurization system

Abstract

This utility model belongs to the field of ultrafine calcium powder dry desulfurization technology, specifically relating to a device for reusing desulfurization waste ash and a dry desulfurization system. The device for reusing desulfurization waste ash includes: an ash storage silo; a pneumatic ash conveying pipeline connected to the ash storage silo; a first desulfurization waste ash conveying pipeline connected to the ash storage silo; a first control valve located on the first desulfurization waste ash conveying pipeline; a variable frequency screw conveyor connected to the first desulfurization waste ash conveying pipeline; and a conveying assembly connected to the variable frequency screw conveyor and the flue.

Description

Technical Field

[0001] This application belongs to the field of ultrafine calcium powder dry desulfurization technology, specifically relating to a device for reusing desulfurization waste ash and a dry desulfurization system. Background Technology

[0002] In industrial production, especially during coal combustion, large amounts of flue gas containing harmful gases such as sulfur dioxide are generated. To reduce sulfur dioxide pollution, ultrafine calcium powder is often used as a desulfurizing agent. Calcium powder has surface activity, which catalyzes the oxidation of sulfur dioxide, promotes its chemical reaction with the calcium powder, accelerates the dissolution of calcium carbonate, promotes the rapid oxidation of calcium sulfite to calcium sulfate, and enhances the precipitation of calcium sulfate, thereby achieving the desulfurization effect.

[0003] Desulfurization of ultrafine calcium carbonate powder produces desulfurization waste ash. If this waste ash is not properly disposed of, it will not only occupy a large amount of land resources for stockpiling, but may also cause secondary pollution to soil, water sources and air. For example, some components of the waste ash may seep into groundwater and pollute the groundwater quality; during stockpiling and transportation, the waste ash is prone to generating dust, increasing the content of particulate matter in the air.

[0004] In related technologies, the stockpiling of desulfurization waste ash leads to a waste of resources. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a device for reusing desulfurization waste ash, which aims to at least partially solve the technical problem of resource waste caused by the stockpiling of desulfurization waste ash.

[0006] The technical solution of this utility model is as follows:

[0007] A device for reusing desulfurization waste ash includes: an ash storage bin; a pneumatic ash conveying pipeline connected to the ash storage bin; a first desulfurization waste ash conveying pipeline connected to the ash storage bin; a first control valve disposed on the first desulfurization waste ash conveying pipeline; a variable frequency screw conveyor connected to the first desulfurization waste ash conveying pipeline; and a conveying assembly connected to the variable frequency screw conveyor and the flue.

[0008] In some embodiments, the conveying assembly includes: a transmitter having an air inlet, a feed inlet, and a discharge outlet, the feed inlet being located between the air inlet and the discharge outlet and communicating with the variable frequency screw conveyor; an air supply pipe communicating with the air inlet; and a conveying pipe communicating with the discharge outlet and the flue.

[0009] In some implementations, the desulfurization waste ash reuse device further includes: a first manual gate valve, located in the first desulfurization waste ash conveying pipeline.

[0010] In some implementations, the desulfurization waste ash reuse device further includes a negative pressure control pipe connected to the ash storage silo.

[0011] In some implementations, the desulfurization waste ash reuse device further includes an off-site transport component connected to the ash storage silo.

[0012] In some implementations, the transport component includes: a second desulfurization waste ash conveying pipeline connected to the ash storage silo; a second control valve located on the second desulfurization waste ash conveying pipeline; and an suction component connected to the second desulfurization waste ash conveying pipeline.

[0013] In some implementations, the transport component further includes a second manual gate valve located in the second desulfurization waste ash transport pipeline.

[0014] In some embodiments, the desulfurization waste ash reuse device further includes: a first level gauge located in the ash storage silo; and a second level gauge located in the ash storage silo; wherein the first level gauge and the second level gauge are spaced apart along the axial direction of the ash storage silo.

[0015] In some implementations, the device for reusing desulfurization waste ash further includes a vibrator located in the ash storage silo.

[0016] Based on the same inventive concept, this application also provides a dry desulfurization system, including the aforementioned desulfurization waste ash reuse device.

[0017] The beneficial effects of this utility model include at least the following:

[0018] Because the pneumatic ash conveying pipeline is connected to the ash storage silo, desulfurization waste ash can enter the ash storage silo through the pneumatic ash conveying pipeline under the drive of the gas inside the pipeline. Since the first desulfurization waste ash conveying pipeline is connected to the ash storage silo, and the first control valve is located on the first desulfurization waste ash conveying pipeline, the on / off state of the first desulfurization waste ash conveying pipeline can be controlled by the first control valve. Because the variable frequency screw conveyor is connected to the first desulfurization waste ash conveying pipeline, and the conveying assembly is connected to the variable frequency screw conveyor and the flue, when the desulfurization waste ash needs to be reused, it is opened... The first control valve is activated, and the variable frequency screw conveyor is started. The variable frequency screw conveyor transports the desulfurization waste ash in the first desulfurization waste ash conveying pipeline to the conveying assembly. The conveying assembly then transports the desulfurization waste ash to the flue, so that some valuable components, such as unreacted calcium compounds, in the desulfurization waste ash can enter the flue. This allows the desulfurization waste ash to come into full contact with SO2 in the flue gas again and undergo a chemical reaction, thereby solidifying and removing SO2. This reduces the consumption of fresh ultrafine calcium powder desulfurizing agent, realizes the reuse of desulfurization waste ash, and reduces costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a device for reusing desulfurization waste ash according to some embodiments.

[0021] In the attached image:

[0022] Ash storage silo 10; pneumatic ash conveying pipeline 20; first desulfurization waste ash conveying pipeline 30; first control valve 40; variable frequency screw conveyor 50; conveying assembly 60; transmitter 61; air conveying pipeline 62; conveying pipeline 63; first manual slide gate valve 70; negative pressure control pipe 80; external transport assembly 90; second desulfurization waste ash conveying pipeline 91; second control valve 92; suction assembly 93; suction pipeline 931; second manual slide gate valve 94; first level gauge 100; second level gauge 110; vibrator 120. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0027] This application is described below with reference to the accompanying drawings and specific embodiments:

[0028] The device for reusing desulfurization waste ash and the dry desulfurization system provided in this embodiment aim to solve, at least to some extent, the technical problem of resource waste caused by the stockpiling of desulfurization waste ash.

[0029] Figure 1 This is a schematic diagram of the structure of a desulfurization waste ash recycling device according to some embodiments. (Combined with...) Figure 1 The desulfurization waste ash reuse device according to this application embodiment includes: an ash storage silo 10, a pneumatic ash conveying pipeline 20, a first desulfurization waste ash conveying pipeline 30, a first control valve 40, a variable frequency screw conveyor 50, and a conveying assembly 60. The pneumatic ash conveying pipeline 20 is connected to the ash storage silo 10. The first desulfurization waste ash conveying pipeline 30 is connected to the ash storage silo 10. The first control valve 40 is located in the first desulfurization waste ash conveying pipeline 30. The variable frequency screw conveyor 50 is connected to the first desulfurization waste ash conveying pipeline 30. The conveying assembly 60 is connected to the variable frequency screw conveyor 50 and the flue.

[0030] The first control valve 40 can be a star-shaped ash discharge valve with good sealing performance, which can effectively prevent the leakage of desulfurization waste ash and the entry of external air, thus avoiding dust pollution and pressure imbalance.

[0031] Since the pneumatic ash conveying pipeline 20 is connected to the ash storage silo 10, desulfurization waste ash can enter the ash storage silo 10 through the pneumatic ash conveying pipeline 20 under the drive of the gas inside the pneumatic ash conveying pipeline 20. Since the first desulfurization waste ash conveying pipeline 30 is connected to the ash storage silo 10, and the first control valve 40 is located in the first desulfurization waste ash conveying pipeline 30, the opening and closing of the first desulfurization waste ash conveying pipeline 30 can be controlled by the first control valve 40. Since the variable frequency screw conveyor 50 is connected to the first desulfurization waste ash conveying pipeline 30, and the conveying assembly 60 is connected to the variable frequency screw conveyor 50 and the flue, when it is necessary to process the desulfurization waste ash... When reusing the waste ash, the first control valve 40 is opened and the variable frequency screw conveyor 50 is started. The variable frequency screw conveyor 50 transports the desulfurization waste ash in the first desulfurization waste ash conveying pipe 30 to the conveying component 60. The conveying component 60 then transports the desulfurization waste ash to the flue, so that some valuable components, such as unreacted calcium compounds, in the desulfurization waste ash can enter the flue and allow the desulfurization waste ash to come into full contact with SO2 in the flue gas and undergo a chemical reaction, thereby solidifying and removing SO2. This reduces the consumption of fresh ultrafine calcium powder desulfurizing agent, realizes the reuse of desulfurization waste ash, and reduces costs.

[0032] In some embodiments, the conveying amount of desulfurization waste ash can be adjusted by regulating the rotation speed of the variable frequency screw conveyor 50 to adapt to changes in flue gas volume and flue gas SO2 concentration under different operating conditions.

[0033] In some embodiments, to convey desulfurization waste ash to the flue, the conveying assembly 60 includes a transmitter 61, a gas supply pipe 62, and a conveying pipe 63. The transmitter 61 has an air inlet, a feed inlet, and a discharge outlet. The feed inlet is located between the air inlet and the discharge outlet and is connected to the variable frequency screw conveyor 50. The gas supply pipe 62 is connected to the air inlet. The conveying pipe 63 is connected to the discharge outlet and the flue.

[0034] After the variable frequency screw conveyor 50 feeds the desulfurization waste ash into the transmitter 61 through the feed port, it blows air into the transmitter 61 through the steam inlet via the gas pipeline 62, so that the desulfurization waste ash in the transmitter 61 enters the conveying pipeline 63 through the discharge port and is transported to the flue by the conveying pipeline 63.

[0035] In some embodiments, the gas supply pipe 62 is connected to an air pump, through which an inert gas (such as nitrogen) can be supplied to the gas supply pipe 62. Of course, compressed air can also be supplied to the gas supply pipe 62.

[0036] In some embodiments, the desulfurization waste ash conveying adopts the gas pipeline 62 for air injection instead of the traditional Roots blower injection, eliminating the hidden danger of desulfurization waste ash not being conveyed due to equipment failure, reducing on-site maintenance workload, and is convenient to operate and flexible to control.

[0037] In some embodiments, to prevent the system from failing to shut down when the first control valve 40 malfunctions, the desulfurization waste ash recycling device further includes a first manual slide gate valve 70. The first manual slide gate valve 70 is located on the first desulfurization waste ash conveying pipeline 30 and controls the opening and closing of the pipeline. When the first control valve 40 malfunctions, the feeding of waste ash into the first desulfurization waste ash conveying pipeline 30 can be stopped via the first manual slide gate valve 70.

[0038] In some embodiments, to prevent the overflow of desulfurization waste ash, the desulfurization waste ash recycling device further includes a negative pressure control pipe 80. The negative pressure control pipe 80 is connected to the ash storage silo 10, and air is drawn from the ash storage silo 10 through the negative pressure control pipe 80 to create a negative pressure inside the ash storage silo 10, so as to prevent the desulfurization waste ash in the ash storage silo 10 from leaking out through the gaps in the ash storage silo 10, and to prevent dust and gas from overflowing and polluting the atmospheric environment.

[0039] Driven by the gas in the pneumatic ash conveying pipe 20, the desulfurization waste ash can enter the ash storage silo 10 through the pneumatic ash conveying pipe 20. Therefore, the air pressure in the ash storage silo 10 will gradually increase. In order to reduce the air pressure in the ash storage silo 10, the air in the ash storage silo 10 is evacuated through the negative pressure control pipe 80 to ensure the safety of the ash storage silo 10.

[0040] During the process of conveying desulfurization waste ash to the flue gas duct by the conveying component 60, fresh ultrafine calcium powder desulfurizing agent is added to the flue gas duct, which causes the amount of desulfurization waste ash to gradually increase, requiring the desulfurization waste ash to be discharged externally. In some embodiments, in order to achieve the discharge of desulfurization waste ash, the desulfurization waste ash recycling device further includes an external transport component 90. The external transport component 90 is connected to the ash storage silo 10, and a portion of the desulfurization waste ash is discharged through the external transport component 90.

[0041] In some embodiments, for off-site transportation, the off-site transportation component 90 includes: a second desulfurization waste ash conveying pipeline 91, a second control valve 92, and an suction component 93. The second desulfurization waste ash conveying pipeline 91 is connected to the ash storage silo 10. The second control valve 92 is located in the second desulfurization waste ash conveying pipeline 91. The suction component 93 is connected to the second desulfurization waste ash conveying pipeline 91.

[0042] When it is necessary to discharge desulfurization waste ash, the second control valve 92 is operated so that the desulfurization waste ash in the second desulfurization waste ash conveying pipeline 91 and the ash storage silo 10 enters the suction component 93 through the second desulfurization waste ash conveying pipeline 91. The suction component 93 is connected to the tanker truck to deliver the desulfurization waste ash into the tanker truck. The desulfurization waste ash is then transported by tanker truck to the cement kiln homogenization silo. The desulfurization waste ash can be used as a catalyst in cement manufacturing, producing high-quality cement and reducing the amount of lime used, thus saving costs. Alternatively, the waste ash can be transported to mines for mine backfilling or road paving.

[0043] In some embodiments, the second control valve 92 can be a star-shaped ash discharge valve, which has good sealing performance and can effectively prevent desulfurization waste ash leakage and external air entry, thereby avoiding dust pollution and pressure imbalance.

[0044] In some embodiments, to transport desulfurization waste ash into the tanker of a tanker truck, the suction assembly 93 includes a suction pipe 931 and a suction pump. The suction pipe 931 is connected to the tanker truck's onboard tank, and the suction pump is started to transport the desulfurization waste ash into the tanker truck's onboard tank.

[0045] In some embodiments, to prevent the machine from failing to stop when the second control valve 92 malfunctions, the transport assembly further includes a second manual slide gate valve 94. The second manual slide gate valve 94 is located in the second desulfurization waste ash conveying pipeline 91 and controls the opening and closing of the second desulfurization waste ash conveying pipeline 91. When the second control valve 92 malfunctions, the feeding of the second desulfurization waste ash conveying pipeline 91 can be stopped by the second manual slide gate valve 94.

[0046] In some embodiments, to determine the amount of desulfurization waste ash stored in the ash storage silo 10, the desulfurization waste ash reuse device further includes: a first level gauge 100 and a second level gauge 110. The first level gauge 100 is disposed in the ash storage silo 10. The second level gauge 110 is disposed in the ash storage silo 10. The first level gauge 100 and the second level gauge 110 are spaced apart along the axial direction of the ash storage silo 10.

[0047] The desulfurization waste ash reuse device also includes a controller, which is electrically connected to a first level gauge 100, a second level gauge 110, a first control valve 40, a second control valve 92, and an air pump connected to the air supply pipeline 62. When the material level in the ash storage silo 10 reaches the position of the first level gauge 100, the first level gauge 100 is triggered and sends a first level signal to the controller. At this time, if there is too much desulfurization waste ash in the ash storage silo 10, it needs to be discharged. The controller sends a first control signal to the first control valve 40 and / or the second control valve 92, so that the first control valve 40 opens the first desulfurization waste ash conveying pipeline 30 and / or the second control valve 92 opens the second desulfurization waste ash conveying pipeline 91. When the material level in the ash storage silo 10 reaches the position of the second level gauge 110, the second level gauge 110 is triggered. The second level gauge 110 sends a second level signal to the controller. At this time, the amount of desulfurization waste ash in the ash storage silo 10 is too low. The controller sends a second control signal to the air pump, and the air pump starts so that the pneumatic ash conveying pipeline 20 can convey desulfurization waste ash to the ash storage silo 10.

[0048] In some embodiments, the first level gauge 100 and the second level gauge 110 can be rotary paddle level gauges without complex circuits or electronic components, which reduces the risk of false alarms or failures caused by electrical faults, and is especially suitable for harsh environments such as dust and high temperature.

[0049] In some embodiments, to prevent desulfurization waste ash from accumulating and hardening in the ash storage silo 10, the desulfurization waste ash reuse device further includes a vibrator 120. The vibrator 120 is located in the ash storage silo 10. Activating the vibrator 120 causes the silo wall of the ash storage silo 10 to vibrate, preventing the desulfurization waste ash from accumulating and hardening in the ash storage silo 10, avoiding blockages, and ensuring smooth conveying of the desulfurization waste ash.

[0050] Based on the same inventive concept, this application also proposes a dry desulfurization system, which adopts a device for reusing the desulfurization waste ash. The specific structure of the device for reusing the desulfurization waste ash is as described in the above embodiments. Since all the technical solutions of the above embodiments are adopted, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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.

[0052] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0054] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0055] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A device for recycling desulfurization waste ash, characterized by comprising: include: Ash storage silos; A pneumatic ash conveying pipeline is connected to the ash storage silo. The first desulfurization waste ash conveying pipeline is connected to the ash storage silo; The first control valve is located in the first desulfurization waste ash conveying pipeline; A variable frequency screw conveyor is connected to the first desulfurization waste ash conveying pipeline; The conveying assembly is connected to the variable frequency screw conveyor and the flue.

2. The device for recycling desulfurization waste ash according to claim 1, wherein The conveying assembly includes: The transmitter has an air inlet, a feed inlet, and a discharge outlet, wherein the feed inlet is located between the air inlet and the discharge outlet, and the feed inlet is connected to the variable frequency screw conveyor; A gas delivery pipeline is connected to the gas inlet; The conveying pipeline is connected to the discharge port and the flue.

3. The device for recycling desulfurization waste ash according to claim 1, wherein The desulfurization waste ash recycling device also includes: The first manual slide gate valve is located on the first desulfurization waste ash conveying pipeline.

4. The device for recycling desulfurization waste ash according to any one of claims 1 to 3, characterized by, The desulfurization waste ash recycling device also includes: The negative pressure control pipe is connected to the ash storage silo.

5. The device for reusing desulfurization waste ash according to any one of claims 1-3, characterized in that, The desulfurization waste ash recycling device also includes: The transport component is connected to the ash storage silo.

6. The device for recycling of desulfurization waste ash according to claim 5, wherein The outbound components include: The second desulfurization waste ash conveying pipeline is connected to the ash storage silo; The second control valve is located in the second desulfurization waste ash conveying pipeline; The suction component is connected to the second desulfurization waste ash conveying pipeline.

7. The device for recycling of desulfurization waste ash according to claim 6, characterized by, The transport components also include: The second manual slide gate valve is located in the second desulfurization waste ash conveying pipeline.

8. The device for recycling desulfurization waste ash according to any one of claims 1 to 3, characterized by, The desulfurization waste ash recycling device also includes: The first level gauge is installed inside the ash storage silo; The second level gauge is installed inside the ash storage silo; Along the axial direction of the ash storage silo, the first level gauge and the second level gauge are arranged at intervals.

9. The device for recycling desulfurization waste ash according to any one of claims 1 to 3, characterized by, The desulfurization waste ash recycling device also includes: A vibrator is installed in the ash storage silo.

10. A dry desulfurization system characterized by, Includes a device for reusing desulfurization waste ash as described in any one of claims 1-9.

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