CN218402775U - Lime feeding system - Google Patents

Abstract

The utility model discloses a lime feed system relates to desulfurization technical field, including lime storehouse, the storehouse of weighing, screw conveyer and unloading pipe, lime storehouse intercommunication has the feed pipe, the storehouse of weighing with the export intercommunication of feed pipe, screw conveyer with the feed opening intercommunication in the storehouse of weighing, screw conveyer includes the rotation axis and around the rotatory helical blade of rotation axis, screw conveyer passes through helical blade's rotation promotes the material to advance, the unloading union coupling screw conveyer and desulfurizing tower. The utility model discloses technical scheme carries out the feed through the roots's fan that adopts screw conveyer to replace conventionality, has avoided the fan to last high-power blast air, and the power consumption is less to this reduces the energy consumption, has reduced the running cost.

Description

Lime feeding system

Technical Field

The utility model relates to a desulfurization technical field, in particular to lime feed system.

Background

Desulfurization, which generally refers to the process of removing sulfur from fuel before combustion and sulfur before emission of flue gas, is one of the important technical measures for preventing and treating atmospheric pollution. At present, a limestone powder feeding system is basically equipped in many flue gas desulfurization processes and used for feeding calcium-based desulfurizing agents (limestone, lime and the like) into the flue gas desulfurization processes for desulfurization.

However, most of the existing limestone powder feeding systems adopt a Roots blower feeding mode, and the Roots blower belongs to a positive displacement blower and is a rotary compressor which compresses and conveys gas by utilizing relative movement of two blade-shaped rotors in a cylinder. The rotary compressor conveys the desulfurization medium in a mode of consuming electric energy and inputting outside air, consumes more energy and has high operation cost.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a lime feed system aims at solving the big problem of lime feed system power consumption in the past.

In order to realize the above purpose, the utility model provides a lime feed system, including lime storehouse, the storehouse of weighing, screw conveyer and unloading pipe, lime storehouse intercommunication has the feed pipe, the storehouse of weighing with the export intercommunication of feed pipe, screw conveyer with the feed opening intercommunication in storehouse of weighing, screw conveyer includes the rotation axis and around the rotatory helical blade of rotation axis, screw conveyer passes through helical blade's rotation promotes the material to advance, the unloading union coupling screw conveyer and desulfurizing tower.

Optionally, the screw conveyor comprises a feeding port and a discharging port, the screw conveyor comprises a primary screw conveyor and a secondary screw conveyor, and the feeding port of the primary screw conveyor is connected with the discharging port of the weighing bin; and the feed inlet of the secondary screw conveyer is connected with the discharge outlet of the primary screw conveyer.

Optionally, the primary screw conveyor is a variable-frequency screw conveyor, and the secondary screw conveyor is a fixed-frequency screw conveyor.

Optionally, the discharge port of the first-stage screw conveyor and the feed port of the second-stage screw conveyor are in flexible connection to form a first flexible connection structure, and the discharge port of the second-stage screw conveyor and the upper portion of the discharge pipe are in flexible connection to form a second flexible connection structure.

Optionally, the screw conveyor is a single-shaft screw conveyor or a twin-shaft screw conveyor.

Optionally, the lime feeding system further comprises a disc impeller feeder, the disc impeller feeder is arranged between the lime bin and the feeding pipe, and the lime bin feeds the lime stored in the lime bin into the feeding pipe through the disc impeller feeder.

Optionally, a first manual gate valve is arranged at the bottom of the lime bin, and the first manual gate valve is controlled to open and close to feed materials to the disc impeller feeder; a second manual gate valve is arranged at the bottom of the weighing bin, and the spiral conveyor is fed by controlling the opening and closing of the second manual gate valve; and a hand valve is arranged below the blanking pipe.

Optionally, a non-metallic expansion joint is arranged between the disc impeller feeder and the feeding pipe.

Optionally, an elbow is arranged at the upper part of the blanking pipe and connected with the screw conveyer, the angle of the elbow is not more than 30 degrees, and an observation hole is formed in the elbow.

Optionally, the side wall of the blanking pipe is provided with a rapper and at least one fluidization plate, the rapper is located at the bottom of the blanking pipe, and the fluidization plate is uniformly arranged along the side wall of the blanking pipe.

The utility model discloses lime feed system sets gradually the lime storehouse, the storehouse of weighing, screw conveyer and unloading pipe, lime storehouse intercommunication has the feed pipe, the storehouse of weighing is connected with the feed pipe, screw conveyer is connected with the feed opening in the storehouse of weighing, screw conveyer includes the rotation axis and winds the rotatory helical blade of rotation axis, screw conveyer passes through helical blade's rotation and promotes the material forward, unloading union coupling screw conveyer and desulfurizing tower to this realizes lime feed system to desulfurizing tower feed desulfurization. The screw conveyor is a machine which utilizes a motor to drive a screw to rotate, pushes materials forwards through the rotation of the helical blade so as to realize the conveying purpose, and has the advantages of simple structure, good sealing performance and small power consumption. Different from the continuous high-power blast compression of a Roots blower, the screw conveyor linearly conveys materials by utilizing the rotary helical blade, and utilizes the motor to convey electric energy, so that the continuous high-power blast of the blower is avoided, and the power consumption is far less than that of a rotary compressor, thereby reducing the energy consumption and the operation cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of a lime feeding system of the present invention assembled with a desulfurization tower;

FIG. 2 is an enlarged view of the lime feeding system according to an embodiment of the present invention;

fig. 3 is a schematic top view of an embodiment of the lime feeding system of the present invention;

fig. 4 is a schematic structural view of a screw conveyor according to an embodiment of the lime feeding system of the present invention;

fig. 5 is a schematic structural view of a blanking pipe according to an embodiment of the lime feeding system of the present invention.

The reference numbers indicate:

reference numerals	Name(s)	Reference numerals	Name (R)
				100	Lime feeding system	51	First-stage screw conveyer
10	Lime bin	511	First-level feed inlet
				11	Feed pipe	512	First-level discharge hole
13	First manual gate valve	52	Two-stage screw conveyer
				20	Disk impeller feeder	521	Second grade feed inlet
21	Non-metal expansion joint	522	Two-stage discharge hole
				30	Weighing bin	53	First flexible connection structure
31	Weighing conveyer	54	Second flexible connection structure
				32	Weighing device	60	Blanking tube
33	Feed opening	61	Elbow
				34	Second manual gate valve	62	Observation hole
35	Exhaust port	63	Vibrator
				36	Viewing port	64	Fluidization plate
40	Stirring device	65	Hand valve
				50	Screw conveyer	70	Desulfurizing tower

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, the descriptions in the present application related to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are implicitly being indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Desulfurization, which generally refers to the process of removing sulfur from fuel before combustion and sulfur before emission of flue gas, is one of the important technical measures for preventing and treating atmospheric pollution. However, most of the existing limestone powder feeding systems adopt a Roots blower feeding mode, and the Roots blower belongs to a positive displacement blower and is a rotary compressor which compresses and conveys gas by utilizing relative movement of two blade-shaped rotors in a cylinder. The rotary compressor conveys the desulfurization medium in a mode of consuming electric energy and inputting outside air, consumes more energy and has high operation cost.

To solve the above problem, the present invention provides a lime feeding system 100.

Referring to fig. 1 to 5, the embodiment of the lime feeding system 100 of the present invention includes a lime bin 10, a weighing bin 30, a screw conveyor 50 and a discharging pipe 60, the lime bin 10 is communicated with a feeding pipe 11, the weighing bin 30 is communicated with an outlet of the feeding pipe 11, the screw conveyor 50 is communicated with a discharging port 33 of the weighing bin 30, the screw conveyor 50 includes a rotating shaft and a helical blade rotating around the rotating shaft, the screw conveyor 50 passes through the rotation of the helical blade pushes the material to advance, the discharging pipe 60 is connected with the screw conveyor 50 and a desulfurizing tower 70.

The utility model discloses lime feed system 100's embodiment from the top down sets gradually lime storehouse 10, storehouse 30, screw conveyer 50 and unloading pipe 60 of weighing, and storehouse 30 of weighing locates the below of lime storehouse 10 and is connected with feed pipe 11, and screw conveyer 50 locates the below of storehouse 30 of weighing and is connected with the feed opening 33 of storehouse 30 of weighing. The lime bin 10 is used for storing limestone powder and conveying the stored limestone powder to a feeding pipe 11 below through the feeding pipe 11.

Different from the related art, the utility model discloses technical scheme feeds through adopting screw conveyer 50 to replace conventional roots's fan. The screw conveyor 50 is a machine that uses a motor to drive a screw to rotate and push materials to achieve the purpose of conveying, and mainly comprises a driving device, a screw body, a head part, a tail part, a feeding hole, a discharging hole, a conveying groove, a bearing and the like. One end of the feed inlet of the screw conveyor 50 is a head part, one end of the discharge outlet is a tail part, materials such as limestone powder enter from the feed inlet of the head part, the screw conveyor 50 conveys the limestone powder materials from the head part to the tail part through a screw blade, and then the limestone powder materials are discharged from the discharge outlet. The driving device consists of a motor, a speed reducer, a coupler and a base. The spiral body is a main component of the spiral conveyor 50 and consists of a spiral blade and a spiral shaft, wherein the spiral shaft is a seamless steel pipe, the spiral blade is also a steel sheet or other metal sheets, and the spiral blade is connected with the spiral shaft through welding. The conveying groove encloses the helical blade in the inner cavity, so that the tightness of the helical conveyor 50 is ensured. The head and tail parts of the device have the function of supporting the spiral body and generally comprise a sealing mechanism, a bearing seat and a head-tail shaft. The shape of the feed inlet and the discharge outlet can be round, square or other shapes.

Alternatively, the screw conveyor 50 is a single-shaft screw conveyor or a double-shaft screw conveyor.

The single-shaft screw conveyor is a screw conveyor with a screw shaft arranged in a seamless steel pipe, the double-shaft screw conveyor is characterized in that two seamless steel pipes are respectively provided with a solid screw shaft, one of the solid screw shafts rotates leftwards, the other of the solid screw shafts rotates rightwards, and screw blades connected with the screw shafts are meshed to rotate. When the screw conveyor works, materials enter the conveying groove from the feeding hole of the conveyor, forward thrust is generated through the screw blades, and the materials are pushed to the discharging hole from the feeding hole to be discharged.

The screw conveyor 50 can convey horizontally, obliquely or vertically, and has the advantages of simple structure, good sealing performance and low power consumption. The utility model discloses lime feed system 100 sets gradually lime storehouse 10, the storehouse 30 of weighing, screw conveyer 50 and unloading pipe 60, lime storehouse 10 intercommunication has feed pipe 11, the storehouse 30 of weighing is connected with feed pipe 11, screw conveyer 50 is connected with the feed opening 33 in the storehouse 30 of weighing, screw conveyer 50 includes the rotation axis and around the rotatory helical blade of rotation axis, screw conveyer 50 promotes the material forward through helical blade's rotation, unloading pipe 60 connects screw conveyer 50 and desulfurizing tower 70, realize lime feed system 100 to desulfurizing tower 70 feed desulfurization with this. The screw conveyor 50 is used for feeding instead of a conventional Roots blower, the screw conveyor 50 is a machine which utilizes a motor to drive a screw to rotate, and materials are pushed forwards through the rotation of a helical blade so as to achieve the purpose of conveying, and the screw conveyor has the advantages of simple structure, good sealing performance and small power consumption. Different from the continuous high-power blast compression of the Roots blower, the screw conveyor 50 utilizes the rotary helical blade to linearly convey materials, utilizes the motor to convey electric energy, avoids continuous high-power blast of the Roots blower, and has electric power far less than that of the rotary compressor, so that the energy consumption is reduced, and the operation cost is reduced.

Further, a stirring device 40 is connected to the side wall of the weighing bin 30.

The upper part of the weighing bin 30 is cylindrical, the lower part of the weighing bin is conical and funnel-shaped, and the cylindrical structure at the upper part and the conical structure at the lower part are of an integral connecting structure. The stirring device 40 is arranged at the bottom of the lower conical structure, and a stirring paddle (not shown in the figure) of the stirring device 40 is positioned in the inner cavity of the weighing bin 30. The stirring device 40 continuously stirs the limestone powder at the bottom of the weighing bin 30, so that the limestone material is prevented from caking and blocking, and the feeding speed is accelerated. The upper wall of the weighing bin 30 is provided with an exhaust port 35 and an observation port 36, the exhaust port 35 is used for exhausting, the observation port 36 is used for conveniently checking the space utilization rate inside the weighing bin 30, the control of the limestone powder allowance in the weighing bin 30 is facilitated, the powder breakage or bin filling is avoided, and the feeding speed of the limestone powder can be observed.

Referring to fig. 2 and 4, the screw conveyor 50 includes a feeding port and a discharging port, the screw conveyor 50 includes a primary screw conveyor 51 and a secondary screw conveyor 52, and the feeding port of the primary screw conveyor 51 is connected with the discharging port 33 of the weighing bin 30; the feed inlet of the secondary screw conveyor 52 is connected with the discharge outlet of the primary screw conveyor 51.

The screw conveyor 50 includes a feeding port and a discharging port, and the feeding port of the first-stage screw conveyor 51 is defined as a first-stage feeding port 511, the discharging port of the first-stage screw conveyor 51 is defined as a first-stage discharging port 512, the feeding port of the second-stage screw conveyor 52 is defined as a second-stage feeding port 521, and the discharging port of the second-stage screw conveyor 52 is defined as a second-stage discharging port 522. One-level screw conveyer 51 level sets up in the below of weighing the storehouse 30, and one-level feed inlet 511 is connected with the feed opening 33 of weighing the storehouse 30, for guaranteeing lime feed system 100's leakproofness, the size and the shape of one-level feed inlet 511 and the size and the shape of the feed opening 33 of weighing the storehouse 30 mutual adaptation for the lime material directly gets into one-level screw conveyer 51 and carries after coming out from weighing the storehouse 30. In order to adapt to the height difference between the blanking pipe 60 and the weighing bin 30, a secondary screw conveyor 52 is further arranged, the secondary screw conveyor 52 is horizontally arranged below the primary screw conveyor 51, the secondary feeding hole 521 is connected with the primary discharging hole 512, and the size and the shape of the primary discharging hole 512 and the secondary feeding hole 521 are matched. The connection means may be a welded connection. Optionally, the upper walls of the first-stage screw conveyor 51 and the second-stage screw conveyor 52 are provided with observation ports 36 for observing whether the conveying grooves of the screw conveyors 50 are blocked or not.

Further, the primary screw conveyor 51 is a variable frequency screw conveyor, and the secondary screw conveyor 52 is a fixed frequency screw conveyor.

The variable-frequency screw conveyor is a screw conveyor adopting a variable-frequency motor, the rotating speed of the helical blade of the primary screw conveyor 51 can be adjusted by adjusting the rotating speed of the motor, and the rotating speed of the variable-frequency screw conveyor is adjusted according to the allowance of the materials and the falling speed, so that the conveying speed of the limestone powder materials is adjusted. And the variable frequency motor has the advantages of energy and electricity saving and noise reduction. The fixed-frequency screw conveyor is a screw conveyor adopting a fixed-frequency motor, and the frequency of the fixed-frequency motor cannot be adjusted, so that the secondary screw conveyor 52 can keep conveying at a constant speed. The fixed-frequency screw conveyor has the advantages of simple setting and uniform conveying. Inverter motor and decide frequently the motor and mutually support and can make the utility model discloses the high-efficient steady operation of lime feed system 100. It will be appreciated that the primary screw conveyor 51 and the secondary screw conveyor 52 may both be variable frequency screw conveyors or fixed frequency screw conveyors.

It should be noted that, the two-stage screw conveyor 50 is provided in the present embodiment, but the lime feeding system 100 of the present invention does not limit the number of stages of the screw conveyor 50, and the number of the corresponding screw conveyors 50 can be increased or decreased according to actual needs, and the increased or decreased screw conveyor 50 can be a variable frequency screw conveyor 50 or a fixed frequency variable screw conveyor 50, which is not limited herein.

Further, a discharge port of the primary screw conveyor 51 is in flexible connection with a feed port of the secondary screw conveyor 52 to form a first flexible connection structure 53, and a discharge port of the secondary screw conveyor 52 is in flexible connection with the upper portion of the blanking pipe 60 to form a second flexible connection structure 54.

The feeding port is convexly arranged at the head part of the screw conveyor 50 and extends upwards, the discharging port is convexly arranged at the tail part of the screw conveyor 50 and extends downwards, the primary discharging port 512 and the secondary feeding port 521 are in flexible connection to form a first flexible connection structure 53, and the secondary discharging port 522 and the upper part of the blanking pipe 60 are in flexible connection to form a second flexible connection structure 54. The flexible connection is realized by adopting canvas, skin and the like. The skin is formed by compounding multiple layers of silicon rubber or high-silica polytetrafluoroethylene with excellent performance, alkali-free glass silk floss and the like, and is a high-strength sealing composite material.

The first flexible connection structure 53 and the second flexible connection structure 54 are both internally hollow cylindrical structures, and in order to ensure the tightness of the lime feeding system 100 of the present invention, the upper portion of the first flexible connection structure 53 extends into the inside of the discharge port of the first-stage screw conveyor 51 and is fixedly connected, and the lower portion thereof extends into the inside of the feed port of the second-stage screw conveyor 52 and is fixedly connected; the upper portion of the second soft connection structure 54 extends into the inside of the discharge port of the second-stage screw conveyor 52 and is fixedly connected with the discharge port, and the lower portion of the second soft connection structure extends into the inside of the upper end of the discharge pipe 60 and is fixedly connected with the discharge pipe, so that the limestone powder material flows along the soft connection structure, and the limestone powder material is prevented from flowing out of a gap of a connection position.

In addition, soft connection structure adopts materials such as canvas, covering not only can effectual isolated dust pollution, can also play the cushioning effect, when the cement thick liquid flows out from screw conveyer 50 discharge gates, can form the impact extrusion to the orifice of a pipe side wall, and the compliance of materials such as canvas, covering provides certain buffer space for the outflow of cement thick liquid, and the absorption inflation volume prevents gas leakage and rainwater seepage.

It should be noted that, in order to measure the feeding speed of the lime feeding system 100 of the present invention, it is ensured that the screw conveyer 50 can finally stably and uniformly convey lime material to the desulfurizing tower 70, and the weighing device 32 for measuring the weight of the weighing bin 30 and the one-level screw conveyer 51 is provided on the outer wall of the weighing bin 30. The first soft connection structure 53 separates the weighing bin 30 and the primary screw conveyor 51 from the secondary screw conveyor 52, and the second soft connection structure 54 separates the secondary screw conveyor 52 from the blanking pipe 60, so that the weighing bin 30 and the primary screw conveyor 51 as a whole are independent from the secondary screw conveyor 52. The reading of the weighing device 32 can accurately measure the total weight of the weighing bin 30 and the primary screw conveyor 51, and the feeding speed can be accurately calculated.

Referring to fig. 5, an elbow 61 is arranged at the upper part of the blanking pipe 60 and connected with the screw conveyer 50, the angle of the elbow 61 is not more than 30 degrees, and an observation hole 62 is arranged at the elbow 61.

The blanking pipe 60 is obliquely arranged, the upper end opening of the blanking pipe 60 is connected with the second soft connecting structure 54, the lower part of the blanking pipe 60 extends into the desulfurizing tower 70, and the lower end opening is positioned inside the desulfurizing tower 70, so that the cement slurry is transmitted from the screw conveyor 50 to the desulfurizing tower 70. Because the blanking pipe 60 is obliquely arranged and the second flexible connecting structure 54 is vertically arranged, a bend 61 is arranged at the connecting part of the upper part of the blanking pipe 60 to convert the transmission path of the pipeline of the blanking pipe 60, so that the blanking pipe 60 and the second flexible connecting structure 54 are in smooth transition connection. The angle of the bend 61 does not exceed 30 deg., and may be 5 deg., 10 deg., 15 deg., etc. Meanwhile, in order to ensure smooth cement slurry discharging, the inclination angle between the discharging pipe 60 and the vertical direction is not too large and is consistent with the angle of the elbow.

In order to facilitate observing whether the elbow 61 is blocked, an observation hole 62 is convexly formed on the side wall of the blanking pipe 60, and the observation hole 62 is formed by extending the elbow 61 of the blanking pipe 60 in the direction away from the straight line section of the blanking pipe 60. The observation hole 62 is a quick-opening observation hole 62, when the elbow 61 is observed to be blocked, the observation hole 62 is opened, the interior of the blanking pipe 60 is communicated with the outside atmosphere, and the limestone powder material deposited at the elbow 61 can flow down rapidly due to the pressure difference caused by the atmosphere communication.

Referring to fig. 2, a first manual gate valve 13 is arranged at the bottom of the lime bin 10, and the first manual gate valve 13 is controlled to open and close to feed materials to the disc impeller feeder 20; the bottom of the weighing bin 30 is provided with a second manual gate valve 34, and the material is discharged to the screw conveyor 50 by controlling the opening and closing of the second manual gate valve 34.

The manual gate valve is used as a switch, and the blanking is controlled by controlling the opening and closing of the manual gate valve. The first manual gate valve 13 is arranged at the bottom of the lime bin 10, when the bottom equipment stops running or needs to be overhauled, the first manual gate valve 13 is closed, a downward passage of limestone powder is blocked, and when the feeding needs to be carried out, the first manual gate valve 13 is opened to feed the disc impeller feeder 20. The second manual gate valve 34 is arranged at the bottom of the weighing bin 30, the second manual gate valve 34 is closed before the limestone powder materials in the weighing bin 30 are stirred to meet the requirement, and after the limestone powder materials in the weighing bin 30 are stirred to meet the requirement, the second manual gate valve 34 is opened to feed the materials to the feed port of the screw conveyor 50 for feeding.

Referring to fig. 2 to 3, a non-metallic expansion joint 21 is provided between the disk impeller feeder 20 and the feeding pipe 11.

The non-metal expansion joint 21 belongs to a compensator, and the main materials are fiber fabric, rubber, high temperature resistant materials and the like. In practice, the material of the non-metallic expansion joint 21 may be the same as the material of the flexible connection structure. The non-metallic expansion joint 21 has a similar function to the flexible connection structure, on one hand, it compensates the vibration of the screw conveyor 50 and the deformation of the pipeline, on the other hand, it prevents air leakage and water seepage, and separates the weighing bin 30 and the first-stage screw conveyor 51 as a whole from the lime bin 10 and the disk impeller feeder 20. Different with soft connection structure is that, the periphery of non-metal expansion joint 21 can cover and establish outer barrel and carry out the separation, and outer barrel can adopt stainless wire net or plastics baffle etc. to play the effect of isolated protection.

It should be noted that, in the lime feeding system 100 of the present invention, the lengths of the flexible connecting structure, the non-metal expansion joint 21, the blanking pipe 60, or other pipes can be adjusted according to the size of the site and the height of the desulfurizing tower 70.

Referring to fig. 5, the side wall of the blanking pipe 60 is provided with a rapper 63 and at least one fluidization plate 64, the rapper 63 is located at the bottom of the blanking pipe 60, and the fluidization plate 64 is uniformly arranged along the side wall of the blanking pipe 60.

The rapping device 63 is arranged on the side wall of the bottom of the blanking pipe 60 before entering the desulfurizing tower 70, and the rapping device body extends into the blanking pipe 60 and is used for dredging the pipeline of the blanking pipe 60. The fluidization plates 64 are provided on the side walls of the linear sections of the down pipe 60, the number of the fluidization plates 64 is at least one, and when a plurality of the fluidization plates 64 are provided, the fluidization plates 64 are arranged at equal intervals and uniformly along the linear sections of the down pipe 60. The fluidization plate 64 is a perforated plate structure formed by rolling, pressing, and sintering a plurality of layers of wire mesh and metal powder. The fluidization plate 64 functions to keep the limestone powder material in the feeding pipe 60 in a fluidized state by compressing air to avoid clogging.

Further, the lower extreme of unloading pipe 60 is provided with hand valve 65, when unloading pipe 60 appeared blockking up, opens hand valve 65, and unloading pipe 60 is inside to be linked together with external atmosphere, and the pressure differential that the atmosphere intercommunication caused can make the limestone slurry flow down fast and get into in desulfurizing tower 70.

To sum up, the utility model discloses lime feed system 100's work flow does: the first manual gate valve 13 at the bottom of the lime bin 10 is opened, the disc impeller feeder 20 is started to adjust the feeding amount of limestone powder, the limestone powder in the lime bin 10 is conveyed into the weighing bin 30, the weighing conveyor 31 is used for metering the amount of the limestone powder, then the weighing conveyor 31 pours the limestone powder to the bottom of the weighing bin 30, after the limestone powder is stirred by the stirring device to meet the requirement, the second manual gate valve 34 is opened to convey the limestone powder to the primary screw conveyor 51, forward thrust is generated by the screw blades to push the material from the feeding hole to the discharging hole, the rotating speed is controlled by the variable frequency motor, the conveying speed is adjusted, cement slurry flows out of the discharging hole of the primary screw conveyor 51, enters the secondary screw conveyor 52, reaches the discharging pipe 60 through secondary transmission, and finally enters the desulfurizing tower 70 through the discharging pipe 60.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A lime feeding system, comprising:

the lime bin is communicated with a feeding pipe;

the weighing bin is communicated with the outlet of the feeding pipe;

the spiral conveyor is communicated with the feed opening of the weighing bin and comprises a rotating shaft and a spiral blade rotating around the rotating shaft, and the spiral conveyor pushes materials to advance through the rotation of the spiral blade;

and the blanking pipe is connected with the screw conveyor and the desulfurizing tower.

2. The lime feeding system of claim 1, wherein the screw conveyor includes a feed inlet and a discharge outlet, the screw conveyor including:

the feeding hole of the primary screw conveyor is connected with the discharging hole of the weighing bin; and

and the feed inlet of the second-stage screw conveyor is connected with the discharge outlet of the first-stage screw conveyor.

3. The lime feeding system of claim 2, wherein the primary screw conveyor is a variable frequency screw conveyor and the secondary screw conveyor is a fixed frequency screw conveyor.

4. The lime feeding system of claim 2, wherein the discharge port of the primary screw conveyor is in flexible connection with the feed port of the secondary screw conveyor to form a first flexible connection structure, and the discharge port of the secondary screw conveyor is in flexible connection with the upper portion of the blanking pipe to form a second flexible connection structure.

5. The lime feeding system of claim 1, wherein the screw conveyor is a single shaft screw conveyor or a twin shaft screw conveyor.

6. The lime feeding system of claim 1, further comprising a disk impeller feeder disposed between the lime bin and the feed pipe, the lime bin feeding its stored lime into the feed pipe through the disk impeller feeder.

7. The lime feeding system of claim 6, wherein the bottom of the lime bin is provided with a first manual gate valve, and the feeding is carried out on the disc impeller feeding machine by controlling the opening and closing of the first manual gate valve;

and/or a second manual gate valve is arranged at the bottom of the weighing bin, and the spiral conveyor is fed by controlling the opening and closing of the second manual gate valve;

and/or a hand valve is arranged below the blanking pipe.

8. The lime feeding system of claim 6, wherein a non-metallic expansion joint is provided between the disk impeller feeder and the feeding tube.

9. The lime feeding system according to any of claims 1 to 8, wherein an elbow is provided at an upper portion of the feeding pipe to connect to the screw conveyor, the angle of the elbow is not more than 30 °, and a viewing hole is provided at the elbow.

10. The lime feeding system according to any of claims 1 to 8, wherein the side wall of the feeding pipe is provided with a rapper at the bottom of the feeding pipe and at least one fluidization plate arranged uniformly along the side wall of the feeding pipe.

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