Granular medicament pre-screening device and fixed bed dry desulfurization system

Abstract

The utility model discloses a granular medicament pre-screening device and a fixed bed dry desulfurization system, and belongs to the technical field of industrial flue gas purification. The device comprises separation equipment, dust removal equipment and a fan, the separation equipment comprises a shell, a dust discharging opening, a screen and an oscillator, a pre-screening cavity is defined by the shell, a feeding opening and a discharging opening which are communicated with the pre-screening cavity are formed in the shell, the periphery of the screen is fixed to the inner wall of the pre-screening cavity, the screen is located between the feeding opening and the discharging opening, and the oscillator is arranged in the pre-screening cavity. The pre-screening chamber is arranged in the shell and is close to the dust discharge port communicated with the pre-screening chamber, meshes of the screen allow medicament particles to pass through, and the oscillator is fixed on the shell and is used for driving the screen to vibrate so as to separate the medicament particles from dust; and the dust removal equipment is respectively connected with the dust discharge port and the fan. According to the utility model, the effect that particulate matters in the discharged flue gas do not exceed the standard when the desulfurizer is filled or replaced without shutdown is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial flue gas purification, in particular to a granular agent pre-screening device and a fixed bed dry desulfurization system. Background Art

[0002] In the fixed bed dry desulfurization technology, the reagent (desulfurizer) used is granular. Affected by the shape and desulfurization efficiency, it will produce a certain degree of powdering during production and transportation. When loading the fixed bed desulfurization equipment, the desulfurizer is lifted to the loading port of the desulfurization tower by the hanging beam, and loaded into the desulfurization tower by gravity. The desulfurization tower is usually equipped with a distribution cone to disperse the desulfurizer. The desulfurizer collides with the distribution cone, causing the dust generated during production and transportation to separate from the desulfurizer. Since the desulfurization tower is under negative pressure when working, the dust is directly sucked out when the desulfurizer is filled or replaced without stopping the machine, and is directly discharged through the chimney, causing the particulate matter index to exceed the standard.

[0003] At present, the fixed bed dry desulfurization technology adopts the installation of valves at the outlet of the desulfurization tower. When filling or replacing the desulfurizer, the valve is closed to prevent the dust from being directly sucked out and discharged, or a bypass pipe is set at the outlet to filter through the bag filter and then return to the fan and discharge through the chimney. Although the former solves the problem of excessive particulate matter when filling or replacing the desulfurizer, when the valve is opened for work, the particulate matter suspended in the desulfurization tower will be directly discharged into the atmosphere through the chimney, which will eventually cause excessive particulate matter. When the desulfurizer is replaced after the valve is closed, the dust-containing air in the desulfurization tower is replaced with the air outside the tower, resulting in unorganized emissions. The latter also solves the problem of excessive particulate matter when filling or replacing the desulfurizer, but the bag filter is set according to the flue gas processing volume of the single tower, and the dust collector is large in size and high in cost. Utility Model Content

[0004] One of the purposes of the present application is to provide a granular agent pre-screening device and a fixed-bed dry desulfurization system, which solves the problem of excessive particulate matter caused by dust generated during the filling or replacement of desulfurization agents.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0006] A granular medicine pre-screening device comprises a separation device, a dust removal device and a fan; the separation device comprises a shell, a dust exhaust port, a screen and an oscillator, the shell encloses a pre-screening chamber and is provided with a feed port and a discharge port respectively connected to the pre-screening chamber, the screen is fixed to the inner wall of the pre-screening chamber on all sides, the screen is located between the feed port and the discharge port and close to the dust exhaust port connected to the pre-screening chamber, the mesh of the screen allows medicine particles to pass through, the oscillator is fixed to the shell and is used to drive the screen to vibrate so as to separate medicine particles and dust; the dust removal device is respectively connected to the dust exhaust port and the fan.

[0007] As an optional scheme, the feed port is located at the center of the upper end of the shell, the discharge port is located at the center of the lower end of the shell, the inner diameter of the feed port is the same as the inner diameter of the discharge port; the lower part of the shell is a funnel-shaped structure, and the discharge port is located at the lowermost end of the funnel-shaped structure.

[0008] As an optional solution, the screen is detachably connected to the shell, the gap between the edge of the screen and the inner wall of the shell does not allow medicine particles to pass through, and the aperture of the screen is set to allow multiple medicine particles to pass through.

[0009] As an optional solution, the oscillator is fixed to the outside of the shell, and the oscillator is arranged facing the screen.

[0010] As an optional scheme, the separation device also includes an annular tube and an air duct, the annular tube is fixed to the inner wall of the shell, and a first through hole and a second through hole are provided on the annular tube, and a plurality of the first through holes are distributed at intervals, the second through hole is connected to one end of the air duct, and the other end of the air duct extends out of the shell to form the dust exhaust port, and the dust-containing airflow enters the dust removal device through the first through hole and the second through hole in turn.

[0011] As an optional solution, a plurality of the first through holes are evenly distributed on the upward side and the downward side of the annular tube respectively;

[0012] The separation device further comprises a mounting frame fixed to the inner wall of the shell, a plurality of the mounting frames are evenly distributed along the circumferential direction, and the upper ends of the mounting frames are used to support the annular tube.

[0013] As an optional solution, a group of the annular tube and the air guide tube is respectively arranged above and below the screen.

[0014] As an optional solution, an inspection hole and an inspection cover are provided on the shell, the inspection hole is arranged close to the screen, and the inspection cover is used to control the opening and closing of the inspection hole.

[0015] As an optional solution, the separation device also includes a movable bracket, which includes a leg, a shock absorber, a base plate and moving wheels. The upper end of the leg is connected to the shell, the lower end of the leg is connected to the base plate through the shock absorber, and a plurality of moving wheels are arranged on the lower end surface of the base plate.

[0016] A fixed bed dry desulfurization system comprises a desulfurization tower and the above-mentioned granular agent pre-screening device, wherein the feed port of the desulfurization tower is connected to the discharge port of the granular agent pre-screening device.

[0017] The utility model has at least the following beneficial effects:

[0018] In the granular agent pre-screening device, the screen vibrates under the action of the oscillator. Due to the large difference in mass between the agent particles and the dust, the sinking speeds of the two are different. The agent particles can still quickly pass through the screen under the action of gravity and gather at the discharge port, while the dust will be lifted up under the action of vibration, thereby desulfurizing with the agent particles. Under the action of the fan, the airflow in the pre-screening chamber flows to the dust removal equipment through the dust discharge port, and the dust separated from the agent particles enters the dust removal equipment with the airflow. Since the distance between the dust discharge port and the screen is close, most of the dust can be discharged. The granular agent pre-screening device is applied to the front end of the desulfurization tower to pre-dedust the desulfurizer, so that the desulfurizer entering the desulfurization tower will be much faster, so that the particulate matter in the flue gas emitted when the desulfurizer is filled or replaced without stopping the machine will not exceed the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical features and advantages of the present invention may be more fully understood by referring to the following detailed description in conjunction with the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of a granular medicine pre-screening device according to an embodiment of the utility model.

[0021] Figure 2 for Figure 1 The AA section view shows the connection between the annular tube and the shell.

[0022] Figure 3 for Figure 2 BB sectional view, and the part reflecting the annular tube and the screen is cut out.

[0023] Figure 4 This is a schematic diagram of a fixed bed dry desulfurization system according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] 1. Separation equipment; 11. Shell; 111. Pre-screening chamber; 112. Feed inlet; 113. Discharge outlet; 12. Screen; 13. Oscillator; 14. Connector; 15. Annular tube; 151. First through hole; 152. Second through hole; 16. Air duct; 161. Dust outlet; 17. Mounting frame; 171. Crossbeam; 172. Inclined beam; 18. Inspection cover; 19. Movable bracket; 191. Leg; 192. Shock absorber; 193. Bottom plate; 194. Moving wheel; 2. Dust removal equipment; 3. Fan; 4. Furnace; 5. Desulfurization tower; 6. Chimney. DETAILED DESCRIPTION

[0026] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.

[0027] refer to Figure 1-4 Understand. The embodiment of the utility model provides a granular reagent pre-screening device, which pre-screens the dust in the reagent before feeding. The reagent can be a desulfurizer, a denitrifier, or a desulfurization and denitrification agent. After the dust is screened out, the reagent enters the desulfurization, denitrification, or desulfurization and denitrification equipment. The following is an example of the application of the granular reagent pre-screening device in a fixed bed dry desulfurization system. Correspondingly, the reagent is a desulfurizer, which enters the desulfurization tower 5 after the dust is removed by the granular reagent pre-screening device, and the flue gas from the furnace 4 ( Figure 4 The flue gas (for illustration only) enters the lower end of the desulfurization tower 5, and after the flue gas reacts with the reagent, it enters the chimney 6 from the upper end of the desulfurization tower 5 through a pipeline for discharge.

[0028] The granular medicine pre-screening device comprises a separation device 1, a dust removal device 2 and a fan 3. The dust removal device 2 can be a bag dust collector. Figure 4 As shown, both the separation device 1 and the dust removal device 2 can share a fan 3 with the desulfurization tower 5. As an alternative, a small fan 3 can be separately provided for the separation device 1 and the dust removal device 2.

[0029] The separation device 1 includes a shell 11, a dust outlet 161, a screen 12 and an oscillator 13. The shell 11 encloses a pre-screen chamber 111 and is provided with a feed port 112 and a feed outlet 113 respectively connected to the pre-screen chamber 111. The shell 11 is softly connected to the desulfurization tower 5 at the feed port and outlet 113 (for example, through a bag connection). The screen 12 is fixed to the inner wall of the pre-screen chamber 111 on all sides, that is, the screen 12 covers the cross-section of the shell 11. The screen 12 is located between the feed port 112 and the feed outlet 113, and is close to the dust outlet 161 connected to the pre-screen chamber 111. The mesh of the screen 12 allows the pharmaceutical particles to pass through. The oscillator 13 is fixed on the shell 11 and is used to drive the screen 12 to vibrate so as to separate the pharmaceutical particles and dust. The dust removal equipment 2 is respectively connected to the dust outlet 161 and the fan 3.

[0030] After the reagent is put into the feed port 112, it falls on the screen 12. The screen 12 vibrates under the action of the oscillator 13. Because the mass difference between the reagent particles and the dust is large, the sinking speed of the two is different. The reagent particles can still quickly pass through the screen 12 under the action of gravity and gather at the feed port and outlet 113, while the dust will be lifted up under the action of vibration, thereby desulfurizing with the reagent particles. Under the action of the fan 3, the airflow in the pre-screen chamber 111 flows to the dust removal device 2 through the dust outlet 161. In this process, the dust separated from the reagent particles enters the dust removal device 2 with the airflow.

[0031] In some embodiments, the feed port 112 is located at the center of the upper end of the shell 11, and the medicine injected from the feed port 112 can fall on the center of the screen 12. When the screen 12 vibrates, it spreads evenly to the surroundings, so it is not easy to form local accumulation of medicine particles on the screen 12. The feed port and the discharge port 113 are located at the center of the lower end of the shell 11. The inner diameter of the feed port 112 is the same as the inner diameter of the feed port and the discharge port 113. The lower part of the shell 11 is a funnel-shaped structure, and the feed port and the discharge port 113 are located at the lower end of the funnel-shaped structure. Therefore, the medicine particles passing through the screen 12 can be evenly gathered at the feed port and the discharge port 113, and further output. The lower end of the shell 11 is not easy to accumulate medicine, so the medicine at the lower end of the shell 11 is kept at a distance from the screen 12, thereby ensuring the dust removal effect.

[0032] In some embodiments, the screen 12 is connected to the shell 11 via a connector 14. A plurality of connectors 14 are fixed at intervals on the circumference of the shell 11, and the upper end of each connector 14 is detachably connected to the screen 12. The gap between the edge of the screen 12 and the inner wall of the shell 11 does not allow the passage of drug particles, thereby improving the vibration effect of the center of the screen 12. As an alternative, while ensuring the vibration effect of the screen 12, the gap between the local position of the edge of the screen 12 and the inner wall of the shell 11 can also allow a single drug to pass through. The aperture of the screen 12 is set to allow a small amount of drug to pass through.

[0033] In some embodiments, the oscillator 13 is fixed to the outside of the housing 11, and the oscillator 13 is arranged opposite to the screen 12, and the height of the screen 12 is between the height of the upper end and the height of the lower end of the oscillator 13; the oscillator 13 and the screen 12 have a one-to-one or many-to-one relationship, and when multiple oscillators 13 correspond to one screen 12, each oscillator 13 is evenly distributed along the circumference of the housing 11. It should be noted that in some other embodiments, the solution of arranging the oscillator 13 on the inner side of the housing 11 is also within the protection scope of the present utility model.

[0034] In some embodiments, the separation device 1 further includes an annular tube 15 and an air duct 16, the annular tube 15 is fixed to the inner wall of the housing 11, and a first through hole 151 and a second through hole 152 are provided on the annular tube 15, a plurality of first through holes 151 are distributed at equal intervals and are arranged toward the pre-screen chamber 111, the second through hole 152 is connected to one end of the air duct 16, and the other end of the air duct 16 extends out of the housing 11 to form a dust outlet 161. The airflow containing dust in the pre-screen chamber 111 enters the annular tube 15 through the first through hole 151, and further flows into the dust removal device 2 through the second through hole 152 and the dust outlet 161.

[0035] like Figure 1-3In the embodiment shown, 12 first through holes 151 are evenly distributed on the upward and downward sides of the annular tube 15. In other embodiments, the specific number of the first through holes 151 can be adjusted. The dust of different sizes will rise to different heights. This solution can efficiently and evenly guide the dust in the pre-screening chamber 111.

[0036] The separation device 1 further comprises a mounting frame 17 fixed to the inner wall of the housing 11, wherein a plurality of mounting frames 17 are evenly distributed along the circumferential direction, and the upper end of the mounting frame 17 is used to support the annular tube 15. Figure 2 and Figure 3 As shown, in one example, the annular tube 15 is connected to the shell 11 through a mounting frame 17, and four mounting frames 17 are evenly fixed on the circumference of the inner wall of the shell 11, and the mounting frame 17 includes a cross beam 171 and an inclined beam 172. The cross beam 171 is horizontally arranged, and one end of the cross beam 171 is fixed to the shell 11, and the other end is fixedly connected to the inclined beam 172, and the other end of the inclined beam 172 is also fixed to the shell 11. The annular tube 15 is detachably connected to the cross beam 171, which is convenient for disassembly and installation of the annular tube 15. Under this concept, the annular tube 15 can be set smaller so that there is a distance between it and the inner wall of the shell 11 on all sides, thereby improving the dust removal effect.

[0037] In some embodiments, a group of annular tubes 15 and air ducts 16 are respectively provided above and below the screen 12. The rising dust is led out through the upper annular tubes 15 and air ducts 16, while some dust that is not lifted up in time or falls below the screen 12 after being lifted up is further led out through the lower annular tubes 15 and air ducts 16, thereby improving the dust removal efficiency.

[0038] In some embodiments, the housing 11 is provided with an inspection hole and an inspection cover 18, the inspection hole is provided near the screen 12, and the inspection cover 18 is used to control the opening and closing of the inspection hole. When the equipment is running, the inspection cover 18 is in a closed state. When inspecting the screen 12, the inspection cover 18 can be opened to reach inside for relevant operations.

[0039] In some embodiments, the separation device 1 further includes a movable bracket 19, and the movable bracket 19 includes a leg 191, a shock absorber 192, a bottom plate 193 and a moving wheel 194. The upper end of the leg 191 is connected to the shell 11, and the lower end of the leg 191 is connected to the bottom plate 193 through the shock absorber 192. The lower end surface of the bottom plate 193 is provided with a plurality of moving wheels 194. The shock absorber 192 can absorb the vibration transmitted from the shell 11 to ensure the overall stability of the separation device 1. The fixed bed dry desulfurization system is usually a multi-tower arrangement, that is, it has a plurality of desulfurization towers 5. Since each desulfurization tower 5 only replaces the desulfurizer at intervals, the present solution is provided with a moving wheel 194 to facilitate the movement of the separation device 1 between different desulfurization towers 5. Multiple towers share one separation device 1 and dust removal device 2, saving costs.

[0040] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A granular medicine pre-screening device, characterized in that: It comprises a separation device, a dust removal device and a fan; the separation device comprises a shell, a dust exhaust port, a screen and an oscillator; the shell surrounds a pre-screen chamber and is provided with a feed port and a discharge port respectively connected to the pre-screen chamber; the screen is fixed to the inner wall of the pre-screen chamber on all sides; the screen is located between the feed port and the discharge port and close to the dust exhaust port connected to the pre-screen chamber; the mesh of the screen allows pharmaceutical particles to pass through; the oscillator is fixed on the shell and is used to drive the screen to vibrate so as to separate the pharmaceutical particles and dust; the dust removal device is respectively connected to the dust exhaust port and the fan.

2. The granular medicine pre-screening device according to claim 1, characterized in that: The feed port is located at the center of the upper end of the shell, the discharge port is located at the center of the lower end of the shell, the inner diameter of the feed port is the same as the inner diameter of the discharge port; the lower part of the shell is a funnel-shaped structure, and the discharge port is located at the lowermost end of the funnel-shaped structure.

3. The granular medicine pre-screening device according to claim 1, characterized in that: The screen is detachably connected to the shell, the gap between the edge of the screen and the inner wall of the shell does not allow medicine particles to pass through, and the aperture of the screen is set to allow multiple medicine particles to pass through.

4. The granular medicine pre-screening device according to claim 1, characterized in that: The oscillator is fixed on the outer side of the shell, and the oscillator is arranged facing the screen.

5. The granular medicine pre-screening device according to claim 1, characterized in that: The separation device also includes an annular tube and an air duct, wherein the annular tube is fixed to the inner wall of the shell, and is provided with a first through hole and a second through hole, wherein a plurality of the first through holes are distributed at intervals, and the second through hole is connected to one end of the air duct, and the other end of the air duct extends out of the shell to form the dust exhaust port, and the dust-containing airflow enters the dust removal device via the first through hole and the second through hole in sequence.

6. The granular medicine pre-screening device according to claim 5, characterized in that: The annular tube is respectively provided with a plurality of the first through holes evenly distributed on the upward side and the downward side; The separation device further comprises a mounting frame fixed to the inner wall of the shell, a plurality of the mounting frames are evenly distributed along the circumferential direction, and the upper ends of the mounting frames are used to support the annular tube.

7. The granular medicine pre-screening device according to claim 5, characterized in that: A group of the annular tube and the air guide tube is respectively arranged above and below the screen.

8. The granular medicine pre-screening device according to claim 1, characterized in that: The shell body is provided with an inspection hole and an inspection cover, the inspection hole is arranged close to the screen, and the inspection cover is used to control the opening and closing of the inspection hole.

9. The granular medicine pre-screening device according to claim 1, characterized in that: The separation device also includes a movable bracket, which includes legs, shock absorbers, a base plate and moving wheels. The upper ends of the legs are connected to the shell, and the lower ends of the legs are connected to the base plate through the shock absorbers. A plurality of moving wheels are arranged on the lower end surface of the base plate.

10. A fixed bed dry desulfurization system, characterized in that: It comprises a desulfurization tower and a granular agent pre-screening device as described in any one of claims 1 to 9, wherein a feed port of the desulfurization tower is connected to a discharge port of the granular agent pre-screening device.

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