CN110773427A - Winnowing removal device for fine particle dust in lime kiln, control method and lime kiln - Google Patents

Winnowing removal device for fine particle dust in lime kiln, control method and lime kiln Download PDF

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Publication number
CN110773427A
CN110773427A CN201911066902.4A CN201911066902A CN110773427A CN 110773427 A CN110773427 A CN 110773427A CN 201911066902 A CN201911066902 A CN 201911066902A CN 110773427 A CN110773427 A CN 110773427A
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dust concentration
dust
air
air inlet
lime kiln
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周浩宇
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements

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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention discloses a winnowing removal device for fine particle dust in a lime kiln, a control method and the lime kiln, wherein the winnowing removal device comprises: the top of the cylinder body is provided with an air outlet, and the upper part of the cylinder body is provided with a feed inlet; the multi-roller fluidized bed device is arranged in the barrel and is positioned below the feeding hole, the multi-roller fluidized bed device comprises a plurality of roller bodies which are arranged side by side, the roller bodies are rotatably arranged in the barrel, a ventilation gap is reserved between every two adjacent roller bodies, one side of the multi-roller fluidized bed device is close to the inner wall of the barrel, and blanking holes are formed between the other side of the multi-roller fluidized bed device and the inner wall of the barrel at intervals; and the air inlet device is arranged at the lower part of the cylinder and is used for blowing air flow into the cylinder. The winnowing removal device and the lime kiln solve the problems of serious environmental pollution and serious waste of fine ore resources during discharging of the existing lime kiln.

Description

Winnowing removal device for fine particle dust in lime kiln, control method and lime kiln
Technical Field
The invention relates to the technical field of lime production equipment, in particular to a winnowing removal device for fine particle dust in a lime kiln, a control method and the lime kiln with the winnowing removal device.
Background
The lime kiln is a core device in the lime production process, raw material limestone is heated to 1100 ℃ in the lime kiln, and the raw material limestone is calcined to generate product lime. The currently widely used lime kiln types are mainly vertical kilns (see figure 1). More lime fine particle dust is generated in the production process of the lime kiln.
The existing lime kiln is not provided with a lime kiln fine particle dust removal and separation system, finished ore discharged from a discharge port at the lower part of the lime kiln contains a large amount of lime powder ore, residue after pulverized coal burning and the like, and the dust can scatter and splash when being discharged from the discharge port along with the finished ore, so that serious environmental dust pollution is formed, and the operation environment beside a machine is deteriorated; in addition, fine particle dust can be scattered in the surrounding environment under the action of environmental wind in the process of feeding opening and belt conveying, and most of the dust is limestone powder ore which can be directly recycled, so that serious resource waste is caused.
Disclosure of Invention
The invention mainly aims to provide a winnowing removal device for fine particle dust in a lime kiln, a control method and the lime kiln, and aims to solve the problems of serious environmental pollution and serious waste of powder ore resources during discharging of the lime kiln in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided an air separation removing device of fine particle dust of a lime kiln, comprising:
the top of the cylinder body is provided with an air outlet, and the upper part of the cylinder body is provided with a feed inlet;
the multi-roller fluidized bed device is arranged in the barrel and is positioned below the feeding hole, the multi-roller fluidized bed device comprises a plurality of roller bodies which are arranged side by side, the roller bodies are rotatably arranged in the barrel, a ventilation gap is reserved between every two adjacent roller bodies, one side of the multi-roller fluidized bed device is close to the inner wall of the barrel, and blanking holes are formed between the other side of the multi-roller fluidized bed device and the inner wall of the barrel at intervals;
and the air inlet device is arranged at the lower part of the cylinder and is used for blowing air flow into the cylinder.
Furthermore, a plurality of sets of multi-roller fluidized bed devices are arranged in the barrel body along the height direction, and blanking ports formed between the adjacent multi-roller fluidized bed devices and the inner wall of the barrel body are not on the same side.
Furthermore, the roller body horizontally penetrates through the barrel body, one end of the roller body is connected with a rotating motor used for driving the roller body to rotate, and the other end of the roller body is rotatably installed on the side wall of the barrel body through a bearing piece.
Further, the bearing piece comprises a bearing plate and a traction plate, the bearing plate is fixedly installed on the side wall of the barrel body, a mounting hole is formed in the bearing plate, the traction plate is fixedly installed at the end portion of the roller body, and the traction plate can rotate in the mounting hole along with the rotation of the roller body.
Furthermore, the bearing part comprises a bearing support table and a plurality of bearing support rollers, the bearing support table is fixedly arranged on the side wall of the cylinder body, the bearing support rollers are rotatably arranged on the bearing support table, and the cylinder body is rotatably arranged on the bearing support tables.
Furthermore, the cylinder body comprises a vertical cylinder, the multi-roller fluidized bed device is arranged in the vertical cylinder, the upper end of the vertical cylinder is connected with a reducing cylinder, the diameter of the upper part of the reducing cylinder is smaller than that of the lower part of the reducing cylinder, and the air outlet is arranged on the upper part of the reducing cylinder.
Further, the air inlet device includes:
the annular air duct is arranged on the outer side of the lower part of the cylinder in an encircling manner;
the output end of the fan is communicated with the annular air channel through a main air inlet pipeline, and an air inlet main pipeline valve is arranged on the main air inlet pipeline;
the air inlet branch pipeline, the one end and the ramus formula wind channel intercommunication of air inlet branch pipeline, the other end and the inner chamber lower part intercommunication of barrel of air inlet branch pipeline, an installation air inlet branch pipe valve on the air inlet branch pipeline, air inlet branch pipeline are many, and many air inlet branch pipelines set up along barrel circumference.
Further, the winnowing removal device also comprises a control system, and the control system comprises:
the dust concentration detector is arranged at the air outlet and is used for detecting the concentration of dust in the gas discharged from the air outlet;
the controller, the dust concentration detector, the fan, the air inlet main pipe valve and the air inlet branch pipe valve are all connected with the controller.
According to another aspect of the invention, there is provided a control method for the air separation removal device of fine particle dust in the lime kiln, which comprises the following steps:
s100: acquiring a dust concentration signal in the gas discharged from the air outlet through a dust concentration detector, sending the dust concentration signal to a controller to be compared with a preset value, and judging whether the dust concentration in the discharged gas reaches the standard or not by the controller;
s200: if the dust concentration in the discharged gas does not reach the standard, the controller controls the output power of the fan to be increased, the dust concentration signal in the gas discharged from the air outlet is obtained again through the dust concentration detector after the gas is continuously operated for a period of time, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned;
s300: if the dust concentration in the discharged gas does not reach the standard, the controller controls the output power of the fan to be increased, the opening degree of the air inlet main pipe valve is increased, the dust concentration signal in the gas discharged from the air outlet is obtained again through the dust concentration detector after the air inlet main pipe valve continuously operates for a period of time, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned;
s400: if the dust concentration in the discharged gas does not reach the standard, the controller controls the output power of the fan to be increased, the opening degree of the main air inlet pipe valve is increased, the opening degree of the branch air inlet pipe valve is increased, the dust concentration signal in the gas discharged from the air outlet is obtained again through the dust concentration detector after the operation is continued for a period of time, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned; and if the dust concentration still does not reach the standard, determining the dust concentration to be in a new normal state, and defining the dust concentration at the moment as a new preset value.
Further, whether the dust concentration in the discharged gas reaches the standard or not is judged by the controller, and the method specifically comprises the following steps:
the dust concentration value lambda in the gas discharged from the air outlet Real timeAnd the historical average dust concentration value lambda of the air outlet AverageCalculating according to the following formula to obtain the current real-time dust difference rate k Real time；
k Real time＝(λ Real time-λ Average)/λ Average
The current real-time dust difference value k Real timeThe difference value k from the preset dust value Setting upComparing;
if k is Real timeGreater than a predetermined dust difference k Setting upThe dust concentration in the discharged gas does not reach the standard;
if k is Real timeLess than or equal to the preset dust difference rate k Setting upThe dust concentration in the discharged gas reaches the standard;
wherein k is Setting upThe specific value of (a) is determined according to the average particle size of the limestone entering the lime kiln.
According to another aspect of the invention, a lime kiln is provided, which comprises a kiln body, a discharge port of the lime kiln is arranged at the lower part of the kiln body, the lime kiln is also provided with the air separation removal device, and the discharge port of the lime kiln is connected with a feed port in the air separation removal device through a material conveying chute.
By applying the technical scheme of the invention, the multi-roll fluidized bed device is arranged in the cylinder, the air outlet is arranged at the top of the cylinder, the air inlet device is arranged below the air separation component at the lower part of the cylinder, air flow is blown into the cylinder through the air inlet device, and the air flow rises through the ventilation gap of the multi-roll fluidized bed device and then flows out through the air outlet; the method comprises the following steps that materials to be subjected to winnowing treatment are thrown into a barrel from a feeding hole, the materials firstly fall onto a multi-roller fluidized bed device in the barrel, a plurality of roller bodies rotate in the same direction, so that the materials move towards a discharging hole along the multi-roller fluidized bed device, air flow rises from a ventilation gap in the moving process to take away fine particle dust in the materials, the fine particle dust is taken away by the ascending air flow and is discharged from an air outlet, and a dust collecting device is arranged at the air outlet to collect the dust; the larger materials after air separation fall from the blanking port and are finally discharged from the discharge port. Through setting up the multiple roll fluidized bed device, make the material disperse better and come, carry out the selection by winnowing at the in-process that the multiple roll fluidized bed device of material removed, improved the separation desorption effect of fine particle dust effectively. The winnowing removal device effectively solves the problems of serious environmental pollution and serious waste of fine ore resources during discharging of the lime kiln.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a lime kiln in the prior art.
FIG. 2 is a schematic structural diagram of a lime kiln according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of an air separation removal device according to an embodiment of the invention.
Fig. 4 is a schematic top view of a multi-roll fluidized bed apparatus in an air separation removal apparatus according to an embodiment of the present invention.
Fig. 5 is a schematic view of the installation of the roller body, the bearing plate and the traction plate in the air separation removal device of the embodiment of the invention.
Fig. 6 is a schematic view of the installation of the roller body, the bearing support table and the bearing carrier roller in the air separation removal device of the embodiment of the invention.
Fig. 7 is a schematic structural view of an air intake device in the air separation removal device in the embodiment of the invention.
Fig. 8 is a flow chart of a control method of the air separation removal device according to the embodiment of the invention.
Wherein the figures include the following reference numerals:
10. a barrel; 11. an air outlet; 12. a vertical cylinder; 13. a reducing cylinder; 20. a multi-roll fluidized bed apparatus; 21. a roller body; 22. a ventilation gap; 23. a blanking port; 30. an air intake device; 31. an annular air duct; 32. a fan; 33. an air inlet branch pipe; 34. a main air inlet pipeline; 35. the air inlet main pipe valve; 36. an air inlet branch pipe valve; 40. a dust concentration detector; 100. a kiln body; 110. a discharge hole of the lime kiln; 120. a material conveying chute; 211. rotating the motor; 212. a force bearing member; 2121. a bearing plate; 2122. a traction plate; 2123. a bearing saddle; 2124. a bearing carrier roller.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in the description and in the claims of the present application do not denote any order, quantity, or importance, but rather the intention is to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Example 1:
referring to fig. 3 to 7, the air separation removal device for fine particle dust in a lime kiln of the embodiment of the invention mainly comprises a cylinder 10, a multi-roll fluidized bed device 20 and an air inlet device 30. Wherein, the top of the cylinder 10 is provided with an air outlet 11, and the upper part of the cylinder 10 is provided with a feed inlet; the multi-roller fluidized bed device 20 is arranged in the barrel 10 and is positioned below the feeding hole, the multi-roller fluidized bed device 20 comprises a plurality of roller bodies 21 which are arranged side by side in the horizontal direction, the roller bodies 21 are rotatably arranged in the barrel 10, a ventilation gap 22 is reserved between every two adjacent roller bodies 21, and the width of the ventilation gap 22 can be set according to the actual situation; one side of the multi-roll fluidized bed device 20 is close to the inner wall of the cylinder 10, and a blanking port 23 is formed between the other side of the multi-roll fluidized bed device 20 and the inner wall of the cylinder 10 at an interval; the air intake device 30 is installed at the lower part of the cylinder 10 and is located below the multi-roll fluidized bed device 20, and the air intake device 30 is used for blowing air flow into the cylinder 10.
According to the air separation removal device for fine particle dust of the lime kiln, the multi-roll fluidized bed device 20 is arranged in the barrel 10, the air outlet 11 is arranged at the top of the barrel 10, the air inlet device 30 is arranged below the multi-roll fluidized bed device 20 at the lower part of the barrel 10, airflow is blown into the barrel 10 through the air inlet device 30, and the airflow rises to pass through the ventilation gap 22 of the multi-roll fluidized bed device 20 and then flows out through the air outlet 11; the material to be winnowed is thrown into the barrel body 10 from the feeding hole, the material firstly falls onto the multi-roller fluidized bed device 20 in the barrel body 10, the plurality of roller bodies 21 rotate in the same direction, so that the material moves towards the blanking hole 23 along the multi-roller fluidized bed device 20, the air flow rises from the ventilation gap 22 in the moving process to take away fine particle dust in the material, the fine particle dust is taken away by the ascending air flow and discharged from the air outlet 11, and the dust collecting device is arranged at the air outlet 11 to collect the dust; the air-separated larger materials fall from the blanking port 23 and are finally discharged from the discharge port. Through setting up multiple roll fluidized bed device 20, make the material disperse better and come, carry out the selection by winnowing at the in-process that material multiple roll fluidized bed device 20 removed, improved the separation desorption effect of fine particle dust effectively. The winnowing removal device effectively solves the problems of serious environmental pollution and serious waste of fine ore resources during discharging of the lime kiln.
Further, referring to fig. 2 and 3, in the present embodiment, a plurality of sets of multi-roll fluidized bed devices 20 are installed in the cylinder 10 along the height direction, and the blanking ports 23 formed between the adjacent multi-roll fluidized bed devices 20 and the inner wall of the cylinder 10 are not on the same side, that is, one end of the adjacent multi-roll fluidized bed device 20 is installed at both sides of the inner wall of the cylinder 10 at intervals, and the rotation directions of the roll bodies 21 in the two sets of multi-roll fluidized bed devices 20 adjacent up and down are opposite. So set up, the material carries out the selection by winnowing through one set of multi-roll fluidized bed device 20, falls into on one set of multi-roll fluidized bed device 20 next from blanking mouth 23 after, moves along multi-roll fluidized bed device 20 again, adopts multi-roll fluidized bed device 20 to carry out the selection by winnowing, has further improved selection by winnowing desorption effect.
Specifically, referring to fig. 4, in the present embodiment, the roller body 21 horizontally penetrates the cylinder 10, one end of the roller body 21 is connected to a rotating motor 211 for driving the roller body 21 to rotate, and the other end of the roller body 21 is rotatably mounted on the side wall of the cylinder 10 through a force bearing member 212. The force-bearing member 212 may take the following two specific forms.
Referring to fig. 5, the first form is: the bearing member 212 includes a bearing plate 2121 and a pulling plate 2122, the bearing plate 2121 is fixedly mounted on the sidewall of the cylinder 10, a mounting hole is provided on the bearing plate 2121, the pulling plate 2122 is fixedly mounted at the end of the roller body 21, and the pulling plate 2122 can rotate in the mounting hole following the rotation of the roller body 21. The bearing plate 2121 is a device similar to a circular clamping rail, and the roller body 21 is driven by the rotating motor 211 to rotate, so as to drive the traction plate 2122 to rotate in the circular clamping rail of the bearing plate 2121.
Referring to fig. 6, the second form is: the bearing member 212 comprises a bearing platform 2123 and a plurality of bearing rollers 2124, the bearing platform 2123 is fixedly arranged on the side wall of the cylinder body 10, the plurality of bearing rollers 2124 are rotatably arranged on the bearing platform 2123, and the roller body 21 is rotatably arranged on the plurality of bearing platforms 2123. This form has an advantage in that it is stronger than the force-bearing member 212 of the first form, and there is no possibility that the middle portion of the roller body 21 collapses without the support member after a long use.
Specifically, referring to fig. 2 and 3, in the present embodiment, the cylinder 10 includes a vertical cylinder 12, the multi-roll fluidized bed apparatus 20 is installed in the vertical cylinder 12, a reducing cylinder 13 is connected to an upper end of the vertical cylinder 12, an upper portion of the reducing cylinder 13 has a smaller diameter than a lower portion thereof, and the air outlet 11 is provided at an upper portion of the reducing cylinder 13. By arranging the reducing cylinder 13 between the vertical cylinder 12 and the air outlet 11, fine particle dust can be better discharged out of the cylinder 10.
Specifically, referring to fig. 2, 3 and 7, in the present embodiment, the air intake device 30 includes a distributed air duct 31, a fan 32, an air intake branch duct 33, an air intake main duct 34 and an air intake main duct valve 35. Wherein, the annular air duct 31 is arranged around the outer side of the lower part of the cylinder 10; the output end of the fan 32 is communicated with the annular air duct 31 through a main air inlet pipe 34, and an air inlet main pipe valve 35 is arranged on the main air inlet pipe 34; one end of the air inlet branch pipe 33 is communicated with the annular air duct 31, the other end of the air inlet branch pipe 33 is communicated with the lower part of the inner cavity of the cylinder 10, an air inlet branch pipe valve 36 is installed on the air inlet branch pipe 33, the air inlet branch pipes 33 are multiple, and the multiple air inlet branch pipes 33 are arranged along the circumferential direction of the cylinder 10. So set up, can be from the lower part of barrel 10 all around to the interior selection by winnowing air current of drum 10 evenly, make the material selection by winnowing desorption effect of each position in the barrel 10 unanimous. The air speed and the air quantity of the air flow blown into the cylinder 10 can be controlled and adjusted through the air inlet main pipe valve 35 and the air inlet branch pipe valve 36.
In order to achieve an automatic control of the air separation removal process, the air separation removal device may optionally further comprise a control system comprising a dust concentration detector 40 and a controller (not shown in the figure). A dust concentration detector 40 is installed at the air outlet 11 and used for detecting and recording the concentration of dust in the gas discharged from the air outlet 11, and the dust concentration detector 40 preferably adopts a light shadow type dust concentration detector; the dust concentration detector 40, the fan 32, the air inlet main pipe valve 35 and the air inlet branch pipe valve 36 are all connected with the controller. Through setting up foretell control system, can improve the degree of automation of device, reduce artifical intensity of labour, also be favorable to improving work efficiency and wind selection effect simultaneously.
Referring to fig. 8, the control method of the air separation removal device adopting the control system is as follows:
s100: acquiring a dust concentration signal in the gas discharged from the air outlet 11 through a dust concentration detector 40, sending the dust concentration signal to a controller to be compared with a preset value, and judging whether the dust concentration in the discharged gas reaches the standard or not by the controller;
s200: if the dust concentration in the discharged gas does not reach the standard, the controller controls the output power of the fan 32 to be increased, the dust concentration detector 40 is used for obtaining a dust concentration signal in the gas discharged from the air outlet 11 after the gas is continuously operated for 2 minutes, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned;
s300: if the dust concentration in the discharged gas does not reach the standard, the controller controls to increase the output power of the fan 32 and increase the opening degree of the air inlet main pipe valve 35, the dust concentration signal in the gas discharged from the air outlet 11 is obtained again through the dust concentration detector 40 after the continuous operation for 2 minutes, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned;
s400: if the dust concentration in the discharged gas does not reach the standard, the controller controls the output power of the fan 32 to be increased, the opening degree of the main air inlet pipe valve 35 is increased, the opening degree of the branch air inlet pipe valve 36 is increased, the dust concentration signal in the gas discharged from the air outlet 11 is obtained again through the dust concentration detector 40 after the continuous operation for 2 minutes, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned; and if the dust concentration still does not reach the standard, judging to be in a new normal state (the dust carrying amount of the charging material is reduced), and defining the dust concentration at the moment as a new preset value.
Specifically, the determining whether the dust concentration in the discharged gas is up to standard by the controller includes: the dust concentration value lambda in the gas discharged from the air outlet 11 Real timeAnd the historical average dust concentration value lambda of the air outlet 11 AverageCalculating according to the following formula to obtain the current real-time dust difference rate k Real time；
k Real time＝(λ Real time-λ Average)/λ Average
The current real-time dust difference value k Real timeThe difference value k from the preset dust value Setting upComparing;
if k is Real timeGreater than a predetermined dust difference k Setting upThe dust concentration in the discharged gas does not reach the standard;
if k is Real timeLess than or equal to the preset dust difference rate k Setting upThe dust concentration in the discharged gas reaches the standard;
wherein k is Setting upAccording to the specific value of the lime kilnThe average particle size of the limestone of (2) is determined.
If the dust concentration still does not reach the standard after the step S400, defaulting that the dust concentration reaches a new normal state of a working condition at the moment, and re-determining the historical average dust concentration value lambda Average。
In the above control method, k Setting upThe relationship with the average particle size of the limestone entering the lime kiln is shown in the following table.
Figure BDA0002259659680000071
The winnowing removal device for fine particle dust in the lime kiln of the embodiment utilizes the functions of taking away and suspending fine particles by fluid in fluid mechanics, and controls the air speed of the air flow entering the cylinder 10 from the lower part in the range of taking away the limestone material particles with larger particle size and the limestone material particles with smaller particle size. The range of flow rate parameters for different functions of the fluid for different particulate limestone materials is shown in the following table:
at rest Suspended in water Carry away
>8mm limestone material <7m/s 7-10m/s >10m/s
<8mm limestone material <5m/s 5-8m/s >8m/s
As can be seen from the above table, when the winnowing removal device of the present embodiment is used for winnowing limestone particles with a particle size of less than 8mm, the wind speed should be controlled between 8-10 m/s. However, this is only the basic condition, and when different equipment is used for winnowing, the different equipment structures cause different particle motion states, and the requirements on wind speed are different. The wind speed can be generally corrected by a factor k, and the k value is different for different device structures. The winnowing removal device of the embodiment can fully disperse materials on the multi-roller fluidized bed device 20 due to the structure of the multi-roller fluidized bed device 20, so that large-particle materials and small-particle powder materials are fully separated, winnowing is facilitated, and the k value of the winnowing removal device is between 0.8 and 0.9.
Example 2:
referring to fig. 2 to 7, a lime kiln according to an embodiment of the present invention includes a kiln body 100, a discharge port 110 of the lime kiln is disposed at a lower portion of the kiln body 100, and an air separation removal device according to an embodiment 1 of the present invention is further disposed in the lime kiln, and the discharge port 110 of the lime kiln is connected to a feed port of the air separation removal device through a material conveying chute 120. The structure of the winnowing removal device is the same as that of the embodiment 1, and the details are not repeated.
Generally, by adopting the air separation removal device and the lime kiln with the air separation removal device, a large amount of dust such as lime powder ore and residues after coal powder burning in the finished lime ore can be effectively taken away by high-speed air; during discharging, fine particle dust cannot scatter and splash at the discharge port 110 of the lime kiln, so that the operation environment beside the machine is effectively improved; through installing dust collection device in air outlet 11 department, can collect the dust material that the selection by winnowing was come out, can realize the recycle of resource, to saving process cost, improving process economic benefits and have obvious effect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a selection by winnowing desorption device of lime kiln fine particle dust which characterized in that, selection by winnowing desorption device includes:
the air purifier comprises a barrel (10), wherein an air outlet (11) is formed in the top of the barrel (10), and a feeding hole is formed in the upper part of the barrel (10);
the multi-roller fluidized bed device (20) is arranged in the barrel body (10) and is positioned below the feeding hole, the multi-roller fluidized bed device (20) comprises a plurality of roller bodies (21) which are arranged side by side, the roller bodies (21) are rotatably arranged in the barrel body (10), a ventilation gap (22) is reserved between every two adjacent roller bodies (21), one side of the multi-roller fluidized bed device (20) is tightly attached to the inner wall of the barrel body (10), and blanking holes (23) are formed between the other side of the multi-roller fluidized bed device (20) and the inner wall of the barrel body (10) at intervals;
the air inlet device (30) is installed on the lower portion of the barrel (10), and the air inlet device (30) is used for blowing air flow into the barrel (10).
2. The air separation removal device for fine particle dust of lime kiln as claimed in claim 1, characterized in that a plurality of sets of said multi-roll fluidized bed devices (20) are installed in said cylinder (10) in the height direction, and said blanking ports (23) formed between adjacent multi-roll fluidized bed devices (20) and the inner wall of said cylinder (10) are not on the same side.
3. The air separation removal device for fine particle dust in lime kilns as claimed in claim 1, characterized in that the roller body (21) extends horizontally through the cylinder (10), one end of the roller body (21) is connected to a rotating motor (211) for driving the roller body (21) to rotate, and the other end of the roller body (21) is rotatably mounted on the side wall of the cylinder (10) through a force-bearing member (212).
4. The air separation removal device of fine particle dust of lime kiln as claimed in claim 3,
the bearing piece (212) comprises a bearing plate (2121) and a traction plate (2122), the bearing plate (2121) is fixedly installed on the side wall of the roller body (10), an installation hole is formed in the bearing plate (2121), the traction plate (2122) is fixedly installed at the end of the roller body (21), and the traction plate (2122) can rotate in the installation hole along with the rotation of the roller body (21);
or the bearing part (212) comprises a bearing supporting table (2123) and a plurality of bearing supporting rollers (2124), the bearing supporting table (2123) is fixedly arranged on the side wall of the cylinder body (10), the plurality of bearing supporting rollers (2124) are rotatably arranged on the bearing supporting table (2123), and the roller body (21) is rotatably arranged on the plurality of bearing supporting tables (2123).
5. The air separation removal device for fine particle dust of lime kiln as claimed in claim 1, characterized in that the drum (10) comprises a vertical drum (12), the multi-roll fluidized bed unit (20) is mounted in the vertical drum (12), the upper end of the vertical drum (12) is connected with a reducing drum (13), the diameter of the upper part of the reducing drum (13) is smaller than the diameter of the lower part thereof, and the air outlet (11) is arranged at the upper part of the reducing drum (13).
6. The air separation and removal device of fine particle dust in lime kilns as claimed in any one of claims 1-5, characterized in that said air intake device (30) comprises:
the annular air duct (31) is arranged on the outer side of the lower part of the cylinder body (10) in an encircling manner;
the output end of the fan (32) is communicated with the annular air duct (31) through a main air inlet pipe (34), and a main air inlet pipe valve (35) is installed on the main air inlet pipe (34);
air inlet lateral duct (33), the one end of air inlet lateral duct (33) with distributed air channel (31) intercommunication, the other end of air inlet lateral duct (33) with the inner chamber lower part intercommunication of barrel (10), an installation air inlet branch pipe valve (36) on air inlet lateral duct (33), air inlet lateral duct (33) are many, many air inlet lateral duct (33) are followed barrel (10) circumference sets up.
7. The apparatus for the air separation removal of fine particle dust from a lime kiln as set forth in claim 6, further comprising a control system, said control system comprising:
a dust concentration detector (40), the dust concentration detector (40) being installed at the air outlet (11) and being used for detecting the concentration of dust in the gas discharged from the air outlet (11);
the controller, dust concentration detector (40) fan (32) the air inlet is responsible for valve (35) and air inlet branch pipe valve (36) all with the controller is connected.
8. The method for controlling the apparatus for the air separation removal of fine particle dust from a lime kiln as set forth in claim 7, comprising:
s100: acquiring a dust concentration signal in the gas discharged from the air outlet (11) through the dust concentration detector (40), sending the dust concentration signal to the controller to be compared with a preset value, and judging whether the dust concentration in the discharged gas reaches the standard or not through the controller;
s200: if the dust concentration in the discharged gas does not reach the standard, the controller controls to increase the output power of the fan (32), the dust concentration detector (40) is used for obtaining a dust concentration signal in the gas discharged from the air outlet (11) again after the gas is continuously operated for a period of time, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned;
s300: if the dust concentration in the discharged gas does not reach the standard, the controller controls to increase the output power of the fan (32) and increase the opening degree of the air inlet main pipe valve (35), the dust concentration detector (40) is used for obtaining a dust concentration signal in the gas discharged from the air outlet (11) after the air inlet main pipe valve continuously operates for a period of time, the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned;
s400: if the dust concentration in the discharged gas does not reach the standard, the controller controls the output power of the fan (32) to be increased, the opening degree of the air inlet main pipe valve (35) is increased, the opening degree of the air inlet branch pipe valve (36) is increased, after the air inlet branch pipe valve continuously operates for a period of time, a dust concentration signal in the gas discharged from the air outlet (11) is obtained through the dust concentration detector (40), the controller judges whether the dust concentration in the discharged gas reaches the standard or not, and if the dust concentration reaches the standard, the step S100 is returned; and if the dust concentration still does not reach the standard, determining the dust concentration to be in a new normal state, and defining the dust concentration at the moment as a new preset value.
9. The method as claimed in claim 8, wherein the determining whether the dust concentration in the discharged gas reaches the standard by the controller comprises:
the dust concentration value lambda in the gas discharged from the air outlet (11) Real timeWith the historical average dust concentration value lambda of the air outlet (11) AverageCalculating according to the following formula to obtain the current real-time dust difference rate k Real time；
k Real time＝(λ Real time-λ Average)/λ Average
The current real-time dust difference value k Real timeThe difference value k from the preset dust value Setting upComparing;
if k is Real timeGreater than a predetermined dust difference k Setting upThe dust concentration in the discharged gas does not reach the standard;
if k is Real timeLess than or equal to the preset dust difference rate k Setting upThe dust concentration in the discharged gas reaches the standard;
wherein k is Setting upAccording to the specific value ofThe average particle size of the limestone entering the lime kiln is determined.
10. A lime kiln comprising a kiln body (100), the lower part of the kiln body (100) being provided with a lime kiln outlet (110), characterized in that the lime kiln is further provided with an air separation removal device according to any one of claims 1-7, the lime kiln outlet (110) being connected to the inlet in the air separation removal device by means of a material transfer chute (120).
CN201911066902.4A 2019-11-04 2019-11-04 Winnowing removal device for fine particle dust in lime kiln, control method and lime kiln Pending CN110773427A (en)

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