Desulfurization waste ash recycling device and dry desulfurization system

Abstract

The invention belongs to the technical field of superfine calcium powder dry desulfurization, and particularly relates to a desulfurization waste ash recycling device and a dry desulfurization system. The desulfurization waste ash recycling device comprises an ash storage bin; the pneumatic ash conveying pipeline is communicated with the ash storage bin; the first desulfurization waste ash conveying pipeline is communicated with the ash storage bin; the first control valve is arranged on the first desulfurization waste ash conveying pipeline; the variable-frequency spiral conveyor is communicated with the first desulfurization waste ash conveying pipeline; and the conveying assembly is communicated with the variable-frequency spiral conveyor and the flue.

Description

Technical Field

[0001] This application belongs to the technical field of dry desulfurization with ultrafine calcium powder, and particularly relates to a device for reusing desulfurized waste ash and a dry desulfurization system. Background Art

[0002] In industrial production, especially during processes such as coal combustion, a large amount of flue gas containing harmful gases such as sulfur dioxide is generated. To reduce the environmental pollution caused by sulfur dioxide, ultrafine calcium powder is often used as a desulfurizer for desulfurization treatment. Calcium powder has surface activity, can catalyze the oxidation of sulfur dioxide, promote its chemical reaction with calcium powder, accelerate the dissolution of calcium carbonate, promote the rapid oxidation of calcium sulfite into calcium sulfate, and strengthen the precipitation of calcium sulfate, thereby achieving the desulfurization effect.

[0003] After desulfurization with ultrafine calcium powder, desulfurized waste ash is produced. If these waste ashes are not properly treated, they will not only occupy a large amount of land resources for stacking, but may also cause secondary pollution to soil, water sources, and air. For example, some components in the waste ash may seep into groundwater, polluting the groundwater quality; during stacking and transportation, the waste ash is prone to generating dust, increasing the particulate matter content in the air.

[0004] In related technologies, the stacking of desulfurized waste ash has led to a waste of resources. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a device for reusing desulfurized waste ash, aiming to at least solve to a certain extent the technical problem that the stacking of desulfurized waste ash leads to a waste of resources.

[0006] The technical solution of the present invention is as follows:

[0007] A device for reusing desulfurized waste ash includes: a dust storage bin; a pneumatic ash conveying pipeline communicated with the dust storage bin; a first desulfurized waste ash conveying pipeline communicated with the dust storage bin; a first control valve provided on the first desulfurized waste ash conveying pipeline; a variable-frequency screw conveyor communicated with the first desulfurized waste ash conveying pipeline; and a conveying assembly communicated with 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 the feed inlet being communicated with the variable-frequency screw conveyor; an air conveying pipeline communicated with the air inlet; and a conveying pipeline communicated with the discharge outlet and the flue.

[0009] In some embodiments, the device for reusing desulfurized waste ash further includes: a first manual slide valve provided on the first desulfurized waste ash conveying pipeline.

[0010] In some embodiments, the device for reusing desulfurized waste ash further comprises a negative pressure control pipe communicated with the ash storage bin.

[0011] In some embodiments, the device for reusing desulfurized waste ash further comprises an external transportation assembly communicated with the ash storage bin.

[0012] In some embodiments, the external transportation assembly comprises a second desulfurized waste ash conveying pipe communicated with the ash storage bin, a second control valve arranged on the second desulfurized waste ash conveying pipe, and an attracting assembly communicated with the second desulfurized waste ash conveying pipe.

[0013] In some embodiments, the external transportation assembly further comprises a second manual slide valve arranged on the second desulfurized waste ash conveying pipe.

[0014] In some embodiments, the device for reusing desulfurized waste ash further comprises a first level gauge arranged in the ash storage bin and a second level gauge arranged in the ash storage bin. Along the axial direction of the ash storage bin, the first level gauge and the second level gauge are arranged at intervals.

[0015] In some embodiments, the device for reusing desulfurized waste ash further comprises a vibrator arranged on the ash storage bin.

[0016] Based on the same inventive concept, the present application further provides a dry desulfurization system including the device for reusing desulfurized waste ash.

[0017] The beneficial effects of the present invention at least include:

[0018] Since the pneumatic ash conveying pipe is communicated with the ash storage bin, under the drive of the gas in the pneumatic ash conveying pipe, the desulfurized waste ash can enter the ash storage bin through the pneumatic ash conveying pipe. Since the first desulfurized waste ash conveying pipe is communicated with the ash storage bin and the first control valve is arranged on the first desulfurized waste ash conveying pipe, the on-off of the first desulfurized waste ash conveying pipe can be controlled through the first control valve. Since the variable-frequency screw conveyor is communicated with the first desulfurized waste ash conveying pipe and the conveying assembly is communicated with the variable-frequency screw conveyor and the flue, when the desulfurized waste ash needs to be reused, the first control valve is opened and the variable-frequency screw conveyor is started. The variable-frequency screw conveyor conveys the desulfurized waste ash in the first desulfurized waste ash conveying pipe to the conveying assembly, and the conveying assembly conveys the desulfurized waste ash to the flue, so that some valuable components in the desulfurized waste ash, such as unreacted calcium compounds, etc., enter the flue, enabling the desulfurized waste ash to come into full contact with SO2 in the flue gas again and undergo a chemical reaction, realizing the solidification and removal of SO2, reducing the consumption of fresh ultrafine calcium powder desulfurizer, achieving the reuse of desulfurized waste ash, and reducing costs. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a structural schematic diagram of a device for reusing desulfurized waste ash in some embodiments.

[0021] In the drawings:

[0022] Ash storage bin 10; pneumatic ash conveying pipeline 20; first desulfurized waste ash conveying pipeline 30; first control valve 40; variable frequency screw conveyor 50; conveying assembly 60, transmitter 61, gas conveying pipeline 62, conveying pipeline 63; first manual shutter valve 70; negative pressure control pipe 80; external transportation assembly 90, second desulfurized waste ash conveying pipeline 91, second control valve 92, suction assembly 93, suction pipeline 931, second manual shutter valve 94; first level gauge 100; second level gauge 110; vibrator 120. Detailed implementation manners

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0025] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The present application will be described below with reference to the accompanying drawings and specific embodiments:

[0028] A device for reusing desulfurized waste ash and a dry desulfurization system provided in this embodiment are intended to at least solve to some extent the technical problem that the stacking of desulfurized waste ash causes waste of resources.

[0029] Figure 1 It is a structural schematic diagram of a device for reusing desulfurized waste ash in some embodiments. Combining Figure 1 , the device for reusing desulfurized waste ash in the embodiment of the present application includes: a dust storage bin 10, a pneumatic ash conveying pipeline 20, a first desulfurized 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 communicated with the dust storage bin 10. The first desulfurized waste ash conveying pipeline 30 is communicated with the dust storage bin 10. The first control valve 40 is arranged on the first desulfurized waste ash conveying pipeline 30. The variable-frequency screw conveyor 50 is communicated with the first desulfurized waste ash conveying pipeline 30. The conveying assembly 60 is communicated with the variable-frequency screw conveyor 50 and the flue.

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

[0031] Since the pneumatic ash conveying pipeline 20 is connected to the ash storage bin 10, under the drive of the gas in the pneumatic ash conveying pipeline 20, the desulfurized waste ash can enter the ash storage bin 10 through the pneumatic ash conveying pipeline 20. Since the first desulfurized waste ash conveying pipeline 30 is connected to the ash storage bin 10 and the first control valve 40 is arranged on the first desulfurized waste ash conveying pipeline 30, the on-off of the first desulfurized waste ash conveying pipeline 30 can be controlled through the first control valve 40. Since the variable-frequency screw conveyor 50 is connected to the first desulfurized waste ash conveying pipeline 30 and the conveying assembly 60 is connected to the variable-frequency screw conveyor 50 and the flue, when the desulfurized waste ash needs to be reused, the first control valve 40 is opened and the variable-frequency screw conveyor 50 is started. The variable-frequency screw conveyor 50 conveys the desulfurized waste ash in the first desulfurized waste ash conveying pipeline 30 to the conveying assembly 60, and the conveying assembly 60 conveys the desulfurized waste ash to the flue, so that some valuable components in the desulfurized waste ash, such as unreacted calcium compounds, etc., enter the flue, enabling the desulfurized waste ash to come into full contact with SO2 in the flue gas again and undergo a chemical reaction, realizing the solidification and removal of SO2, reducing the consumption of fresh ultrafine calcium powder desulfurizer, achieving the reuse of the desulfurized waste ash, and reducing the cost.

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

[0033] In some embodiments, in order to convey the desulfurized waste ash to the flue, the conveying assembly 60 includes: a transmitter 61, a gas transmission pipeline 62, and a conveying pipeline 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 the feed inlet is connected to the variable-frequency screw conveyor 50. The gas transmission pipeline 62 is connected to the air inlet. The conveying pipeline 63 is connected to the discharge outlet and the flue.

[0034] After the variable-frequency screw conveyor 50 conveys the desulfurized waste ash into the transmitter 61 through the feed inlet, air is blown into the transmitter 61 through the gas transmission pipeline 62 through the steam inlet for jetting, so that the desulfurized waste ash in the transmitter 61 enters the conveying pipeline 63 through the discharge outlet and is conveyed to the flue through the conveying pipeline 63.

[0035] In some embodiments, the gas transmission pipeline 62 is connected to an air pump, and an inert gas (such as nitrogen) can be conveyed to the gas transmission pipeline 62 through the air pump. Of course, compressed air can also be conveyed to the gas transmission pipeline 62.

[0036] In some embodiments, the pneumatic ash conveying is carried out by jetting air through the gas transmission pipeline 62 to replace the traditional Roots blower jetting, eliminating the hidden danger that the desulfurized waste ash cannot be conveyed due to equipment failures, reducing the on-site maintenance workload, and moreover, it is convenient to operate and flexible to control.

[0037] In some embodiments, to avoid the inability to stop the machine when the first control valve 40 fails, the desulfurized waste ash recycling device further includes: a first manual slide valve 70. The first manual slide valve 70 is arranged on the first desulfurized waste ash conveying pipeline 30, and the on-off of the first desulfurized waste ash conveying pipeline 30 is controlled through the first manual slide valve 70. When the first control valve 40 fails, the feeding of the first desulfurized waste ash conveying pipeline 30 can be stopped through the first manual slide valve 70.

[0038] In some embodiments, to prevent the overflow of desulfurized waste ash, the desulfurized waste ash recycling device further includes: a negative pressure control pipe 80. The negative pressure control pipe 80 is communicated with the ash storage bin 10, and the ash storage bin 10 is evacuated through the negative pressure control pipe 80 to form a negative pressure in the ash storage bin 10, so as to prevent the desulfurized waste ash in the ash storage bin 10 from leaking through the gaps on the ash storage bin 10 and prevent the dust gas from overflowing and polluting the atmospheric environment.

[0039] Since the desulfurized waste ash can enter the ash storage bin 10 through the pneumatic ash conveying pipeline 20 under the drive of the gas in the pneumatic ash conveying pipeline 20, the air pressure in the ash storage bin 10 will gradually increase. To reduce the air pressure in the ash storage bin 10, the ash storage bin 10 is evacuated through the negative pressure control pipe 80 to ensure the safety of the ash storage bin 10.

[0040] During the process of the conveying assembly 60 conveying the desulfurized waste ash to the flue, fresh ultrafine calcium powder desulfurizer is added to the flue, which will cause the amount of desulfurized waste ash to gradually increase, and the desulfurized waste ash needs to be discharged. In some embodiments, to achieve the discharge of desulfurized waste ash, the desulfurized waste ash recycling device further includes: an external transportation assembly 90. The external transportation assembly 90 is communicated with the ash storage bin 10, and part of the desulfurized waste ash is discharged through the external transportation assembly 90.

[0041] In some embodiments, to achieve external transportation, the external transportation assembly 90 includes: a second desulfurized waste ash conveying pipeline 91, a second control valve 92, and an attracting assembly 93. The second desulfurized waste ash conveying pipeline 91 is communicated with the ash storage bin 10. The second control valve 92 is arranged on the second desulfurized waste ash conveying pipeline 91. The attracting assembly 93 is communicated with the second desulfurized waste ash conveying pipeline 91.

[0042] When it is necessary to discharge the desulfurized waste ash, the second control valve 92 is operated so that the desulfurized waste ash in the ash storage bin 10 enters the attracting assembly 93 through the second desulfurized waste ash conveying pipeline 91. The attracting assembly 93 is communicated with the vehicle-mounted tank of the tanker to feed the desulfurized waste ash into the vehicle-mounted tank of the tanker. The desulfurized waste ash is transported to the homogenization silo of the cement kiln by the tanker. The desulfurized waste ash can be used as a catalyst for cement manufacturing, which can produce high-quality cement, reduce the consumption of lime, save costs, and can also transport the sulfur waste ash to the mine 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, can effectively prevent the leakage of desulfurized waste ash and the entry of external air, and avoid dust pollution and pressure imbalance.

[0044] In some embodiments, in order to convey the desulfurized waste ash into the on-vehicle tank of the tanker truck, the suction assembly 93 includes: a suction pipeline 931 and a suction pump. The suction pipeline 931 is communicated with the on-vehicle tank of the tanker truck, and the suction pump is started. Under the action of the suction pump, the desulfurized waste ash is conveyed into the on-vehicle tank of the tanker truck.

[0045] In some embodiments, in order to avoid the inability to stop the machine when the second control valve 92 fails, the external transportation assembly further includes: a second manual slide valve 94. The second manual slide valve 94 is arranged on the second desulfurized waste ash conveying pipeline 91. The on-off of the second desulfurized waste ash conveying pipeline 91 is controlled by the second manual slide valve 94. When the second control valve 92 fails, the feeding of the second desulfurized waste ash conveying pipeline 91 can be stopped through the second manual slide valve 94.

[0046] In some embodiments, in order to judge the storage amount of desulfurized waste ash in the ash storage bin 10, the desulfurized waste ash recycling device further includes: a first level gauge 100 and a second level gauge 110. The first level gauge 100 is arranged in the ash storage bin 10. The second level gauge 110 is arranged in the ash storage bin 10. Among them, along the axial direction of the ash storage bin 10, the first level gauge 100 and the second level gauge 110 are arranged at intervals.

[0047] The desulfurized waste ash recycling device further includes a controller, and the controller is electrically connected to the first level gauge 100, the second level gauge 110, the first control valve 40, the second control valve 92 and the air pump communicated with the air conveying pipeline 62. When the material level in the ash storage bin 10 reaches the position of the first level gauge 100, the first level gauge 100 is triggered, and the first level gauge 100 sends a first level signal to the controller. At this time, the amount of desulfurized waste ash in the ash storage bin 10 is too much and needs to be discharged externally. 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 desulfurized waste ash conveying pipeline 30 and / or the second control valve 92 opens the second desulfurized waste ash conveying pipeline 91. When the material level in the ash storage bin 10 reaches the position of the second level gauge 110, the second level gauge 110 is triggered, and the second level gauge 110 sends a second level signal to the controller. At this time, the amount of desulfurized waste ash in the ash storage bin 10 is too little, and 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 desulfurized waste ash into the ash storage bin 10.

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

[0049] In some embodiments, in order to prevent the desulfurized waste ash from accumulating and caking in the ash storage bin 10, the desulfurized waste ash recycling device further includes a vibrator 120. The vibrator 120 is arranged in the ash storage bin 10. When the vibrator 120 is started, the bin wall of the ash storage bin 10 vibrates, preventing the desulfurized waste ash from accumulating and caking in the ash storage bin 10, avoiding blockage, and ensuring smooth conveyance of the desulfurized waste ash.

[0050] Based on the same inventive concept, the present application also proposes a dry desulfurization system, which employs the desulfurized waste ash recycling device. The specific structure of the desulfurized waste ash recycling device refers to the above embodiments. Since all the technical solutions of the above embodiments are adopted, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0051] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0052] In the description of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0053] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0054] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A device for recycling desulfurized waste ash, characterized in that, Comprising: Ash storage bin; Pneumatic ash conveying pipeline, communicating with the ash storage bin; First desulfurized waste ash conveying pipeline, communicating with the ash storage bin; First control valve, provided on the first desulfurized waste ash conveying pipeline; Variable-frequency screw conveyor, communicating with the first desulfurized waste ash conveying pipeline; Conveying assembly, communicating with the variable-frequency screw conveyor and the flue.

2. The device for recycling desulfurized waste ash according to claim 1, wherein, The conveying assembly includes: Sender, 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 the feed inlet communicating with the variable-frequency screw conveyor; Air conveying pipeline, communicating with the air inlet; Conveying pipeline, communicating with the discharge outlet and the flue.

3. The device for recycling desulfurized waste ash according to claim 1, wherein, The desulfurized waste ash reuse device further includes: First manual slide valve, provided on the first desulfurized waste ash conveying pipeline.

4. The device for recycling desulfurized waste ash according to any one of claims 1-3, characterized in that, The desulfurized waste ash reuse device further includes: Negative pressure control pipe, communicating with the ash storage bin.

5. The device for recycling desulfurized waste ash according to any one of claims 1-3, characterized in that, The desulfurized waste ash reuse device further includes: External transportation assembly, communicating with the ash storage bin.

6. The device for recycling desulfurized waste ash according to claim 5, wherein The external transportation assembly includes: Second desulfurized waste ash conveying pipeline, communicating with the ash storage bin; Second control valve, provided on the second desulfurized waste ash conveying pipeline; Suction assembly, communicating with the second desulfurized waste ash conveying pipeline.

7. The reuse device for desulfurized waste ash according to claim 6, characterized in that, The external transportation assembly further includes: Second manual slide valve, provided on the second desulfurized waste ash conveying pipeline.

8. The device for recycling desulfurized waste ash according to any one of claims 1-3, characterized in that The desulfurized waste ash reuse device further includes: First level gauge, provided inside the ash storage bin; Second level gauge, provided inside the ash storage bin; Wherein, along the axial direction of the ash storage bin, the first level gauge and the second level gauge are arranged at intervals.

9. The device for recycling desulfurized waste ash according to any one of claims 1 to 3, characterized in that, The desulfurized waste ash reuse device further includes: Vibrator, provided on the ash storage bin.

10. A dry desulfurization system, characterized in that, Including the desulfurized waste ash reuse device according to any one of claims 1-9.

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