CN110788003B - Control method of air separation device for removing fine particle dust of lime kiln - Google Patents

Control method of air separation device for removing fine particle dust of lime kiln Download PDF

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Publication number
CN110788003B
CN110788003B CN201911067734.0A CN201911067734A CN110788003B CN 110788003 B CN110788003 B CN 110788003B CN 201911067734 A CN201911067734 A CN 201911067734A CN 110788003 B CN110788003 B CN 110788003B
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air
dust concentration
dust
chute
air separation
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CN110788003A (en
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周浩宇
魏进超
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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
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • 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
    • B07B11/04—Control arrangements
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/135—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by sensing at least one property of the mixture
    • G05D11/138—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by sensing at least one property of the mixture by sensing the concentration of the mixture, e.g. measuring pH value

Abstract

The invention discloses a winnowing device for removing fine particle dust in a lime kiln, a control method thereof and the lime kiln, wherein the winnowing device comprises: the top of the chute cover body is provided with a feed inlet, and the bottom of the chute cover body is provided with a discharge outlet; the air separation chute panel is obliquely arranged in the inner cavity of the chute cover body, a plurality of air distribution holes are formed in the air separation chute panel, an oblique air separation channel is formed between the upper side surface of the air separation chute panel and the side wall of the chute cover body, and two ends of the air separation channel are respectively communicated with the feed port and the discharge port; the air inlet device is arranged below the winnowing chute panel and used for blowing air flow to the lower side of the winnowing chute panel, an air outlet is formed in the chute cover body, and the air outlet is communicated with the winnowing channel. The winnowing 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

Control method of air separation device for removing fine particle dust of lime kiln
Technical Field
The invention relates to the technical field of lime production equipment, in particular to a winnowing device for removing fine particle dust in a lime kiln, a control method of the winnowing device and the lime kiln.
Background
Lime is an important auxiliary raw material widely used in the metallurgical industry. In the processes of sintering of iron-making raw materials, iron-making reduction, pretreatment of molten iron and external refining, lime is used as an additive, has the functions of adjusting the alkalinity of furnace charge, slagging, desulfurization and the like, and plays an important role in smoothly carrying out the iron-making and steel-making processes.
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. Because the existing lime kiln is not provided with a lime kiln fine particle dust removal and separation system, the 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, thereby forming serious environmental dust pollution and deteriorating the operation environment beside a machine; 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 device for removing fine particle dust in a lime kiln, a control method thereof 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 device for removing fine particulate dust of a lime kiln, the air separation device comprising:
the top of the chute cover body is provided with a feed inlet, and the bottom of the chute cover body is provided with a discharge outlet;
the air separation chute panel is obliquely arranged in the inner cavity of the chute cover body, a plurality of air distribution holes are formed in the air separation chute panel, an oblique air separation channel is formed between the upper side surface of the air separation chute panel and the side wall of the chute cover body, and two ends of the air separation channel are respectively communicated with the feed port and the discharge port;
the air inlet device is arranged below the winnowing chute panel and used for blowing air flow to the lower side of the winnowing chute panel, an air outlet is formed in the chute cover body, and the air outlet is communicated with the winnowing channel.
Furthermore, a plurality of air distribution holes on the panel of the air separation chute are arranged in a rectangular array or in an annular array.
Furthermore, a reducing necking is arranged on the chute cover body, one end of the reducing necking is communicated with the air separation channel, the other end of the reducing necking is communicated with the air outlet, and the caliber of the end, close to the air outlet, of the reducing necking is smaller than that of the end, close to the air separation channel, of the reducing necking.
Further, the air inlet device includes:
the annular air duct is arranged on the outer side of the lower part of the chute cover body;
the output end of the fan is communicated with the annular air channel through an air inlet main pipeline;
the air inlet branch pipe, the one end and the ramus formula wind channel intercommunication of air inlet branch pipe, the inner chamber lower part intercommunication of the other end and the chute cover body of air inlet branch pipe, air inlet branch pipe are many, and many air inlet branch pipes arrange at a plurality of sides of the chute cover body.
Furthermore, an air inlet main pipe valve is arranged on the air inlet main pipeline, and an air inlet branch pipe valve is arranged on the air inlet branch pipeline.
Furthermore, the top of the chute cover body is in flexible connection with a discharge port of the lime kiln through a suspension device, a weighing device is arranged on the suspension device, and the chute cover body is also connected with a lump removing device.
Further, the air separation 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, the air inlet branch pipe valve, the weighing device and the tumor cleaning device are all connected with the controller.
According to another aspect of the invention, there is provided a control method of the air separation device for removing 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 outletReal timeAnd the historical average dust concentration value lambda of the air outletAverageCalculating according to the following formula to obtain the current real-time dust difference rate kReal time；
kReal time＝(λReal time-λAverage)/λAverage
The current real-time dust difference value kReal timeThe difference value k from the preset dust valueSetting upComparing;
if k isReal timeGreater than a predetermined dust difference kSetting upThe dust concentration in the discharged gas does not reach the standard;
if k isReal timeLess than or equal to the preset dust difference rate kSetting upThe dust concentration in the discharged gas reaches the standard;
wherein k isSetting upThe specific value of (a) is determined according to the average particle size of the limestone entering the lime kiln.
Further, the control method further comprises:
s500: in the operation process of the air separation device, the whole weight of the air separation device is obtained through the weighing device, the whole weight information of the air separation device is sent to the controller, and when the whole weight of the air separation device exceeds a set value, the controller controls the starting of the nodule cleaning device to clean calcified nodules in the air separation device.
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 device, and the discharge port of the lime kiln is communicated with a feed port in the air separation device.
By applying the technical scheme of the invention, the chute cover body is internally and obliquely provided with the winnowing chute panel, the oblique winnowing channel is formed above the winnowing chute panel, the air inlet device is arranged below the winnowing chute panel, and the chute cover body is provided with the air outlet communicated with the winnowing channel; the material enters the chute cover body from the feeding hole, and slowly moves downwards along the panel of the winnowing chute in the winnowing channel under the action of gravity; meanwhile, high-speed airflow is blown into the lower portion of the wind separation chute panel through the air inlet device, the airflow passes through the material layer which moves slowly on the wind separation chute panel through the air distribution holes, dust mixed in the material is brought into the airflow and then discharged through the air outlet, and the dust collecting device is installed at the air outlet to collect the dust separated by wind. The winnowing device effectively solves the problems of serious environmental pollution and serious waste of fine ore resources during discharging of the existing 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 device according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of an air intake device in the air separation device according to the embodiment of the present invention.
Fig. 5 is a schematic structural view of an air separation chute panel in the air separation device according to the embodiment of the present invention.
Fig. 6 is a schematic structural view of another air separation chute panel in the air separation device of the embodiment of the invention.
Fig. 7 is a schematic structural diagram of an air separation device provided with a suspension device and a weighing device according to an embodiment of the present invention.
Fig. 8 is a flowchart illustrating a method of controlling the air classification device according to the embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a chute cover body; 11. a feed inlet; 12. a discharge port; 13. an air separation channel; 14. an air outlet; 15. reducing and necking; 20. A winnowing chute panel; 21. air distribution holes; 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; 50. a suspension device; 60. a weighing device; 100. a kiln body; 110. a discharge hole of the lime kiln; 120. a bearing ring plate.
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 device for removing fine particle dust of the lime kiln mainly comprises a chute cover body 10, an air separation chute panel 20 and an air inlet device 30. Wherein, the top of the chute cover body 10 is provided with a feed inlet 11, and the bottom of the chute cover body 10 is provided with a discharge outlet 12; the winnowing chute panel 20 is obliquely arranged in the inner cavity of the chute hood body 10, a plurality of air distribution holes 21 are formed in the winnowing chute panel 20, an oblique winnowing channel 13 is formed between the upper side surface of the winnowing chute panel 20 and the side wall of the chute hood body 10, and two ends of the winnowing channel 13 are respectively communicated with the feeding hole 11 and the discharging hole 12; the air intake device 30 is installed below the winnowing chute panel 20, the air intake device 30 is used for blowing air flow to the lower side of the winnowing chute panel 20, an air outlet 14 is arranged on the chute cover body 10, and the air outlet 14 is communicated with the winnowing channel 13.
In the air separation device for removing fine particle dust of the lime kiln, the air separation chute panel 20 is obliquely arranged in the chute cover body 10, the oblique air separation channel 13 is formed above the air separation chute panel 20, the air inlet device 30 is arranged below the air separation chute panel 20, and the air outlet 14 communicated with the air separation channel 13 is arranged on the chute cover body 10; the material enters the chute cover body 10 from the feed inlet 11, and slowly moves downwards along the winnowing chute panel 20 in the winnowing channel 13 under the action of gravity; meanwhile, high-speed airflow is blown into the lower portion of the air separation chute panel 20 through the air inlet device 30, the airflow passes through the material layer which moves slowly on the air separation chute panel 20 through the air distribution holes 21, dust mixed in the material is brought into the airflow and then discharged through the air outlet 14, and the dust collection device is installed at the air outlet 14 to collect the dust which is separated by air. The winnowing device effectively solves the problems of serious environmental pollution and serious waste of fine ore resources during discharging of the existing lime kiln.
Referring to fig. 5 and 6, in the present embodiment, the plurality of air distribution holes 21 on the air separation chute panel 20 are arranged in a rectangular array or in an annular array.
Referring to fig. 3, in this embodiment, a reducing throat 15 is provided on the chute cover body 10, one end of the reducing throat 15 is communicated with the air separation channel 13, the other end of the reducing throat 15 is communicated with the air outlet 14, and the caliber of the end of the reducing throat 15 close to the air outlet 14 is smaller than that of the end close to the air separation channel 13. This arrangement facilitates better discharge of fine-grained dust from the air separation channel 13.
Specifically, referring to fig. 3 and 4, in the present embodiment, the air intake device 30 includes a distributed air duct 31, a fan 32, an air intake branch duct 33, and an air intake main duct 34. Wherein, the annular air duct 31 is arranged at the outer side of the lower part of the chute cover body 10; the output end of the fan 32 is communicated with the annular air duct 31 through a 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 chute cover body 10, the air inlet branch pipes 33 are multiple, and the multiple air inlet branch pipes 33 are arranged on multiple side faces of the chute cover body 10. So set up, can be from a plurality of directions of the lower part of the chute cover body 10 to the interior air separation air current that drum of the chute cover body 10, make the material winnowing desorption effect of each position in the chute cover body 10 unanimous.
In order to control the air speed and the air volume of the airflow blown into the chute cover body 10, referring to fig. 4, in the present embodiment, an air inlet main pipe valve 35 is installed on the air inlet main pipe 34, and an air inlet branch pipe valve 36 is installed on the air inlet branch pipe 33. The wind speed and the wind quantity of the airflow blown into the chute cover body 10 can be conveniently controlled and adjusted by adjusting the opening degrees of the main wind inlet pipe valve 35 and the branch wind inlet pipe valves 36. The corresponding air separation process parameters can be conveniently adjusted according to the properties of the materials.
When the humidity of the environment is too high during the operation of the winnowing device, the material may be calcified (CaO absorbs water to become Ca (OH)) due to the excessive humidity of the air in the chute cover body 102With CO in the air2Reaction to form CaCO with strong adhesion3) Thereby blocking the chute air distribution holes 21 and even blocking the chute air separation channel 13. In order to solve the above problem, referring to fig. 7, the top of the chute enclosure 10 may be connected to the discharge port 110 of the lime kiln through a suspension device 50, and the weighing device 60 is provided on the suspension device 50, so as to connect the chute enclosure 10 to a lump removing device (not shown). The whole weight of the air separation device is weighed through the weighing device 60, and when the whole weight of the air separation device rises steeply, calcified nodules in the chute cover body 10 are judged, and then the nodule cleaning device is started to clean the calcified nodules in the chute cover body 10. Therefore, the normal operation of the winnowing device can be ensured when the environmental humidity is overlarge. The tumor removing device can specifically adopt the existing electric vibration device, an air cannon or an electric arc cutting gun and the like.
In order to realize the automatic control of the air separation removal process, the air separation removal device may further include a control system, which includes a dust concentration detector 40 and a controller (not shown in the figure), the dust concentration detector 40 is installed at the air outlet 14 for detecting the concentration of dust in the gas discharged from the air outlet 14, and the dust concentration detector 40 preferably employs a shadow dust concentration detector; the dust concentration detector 40, the fan 32, the air inlet main pipe valve 35, the air inlet branch pipe valve 36, the weighing device 60 and the tumor cleaning device 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 14 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 14 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 signal in the gas discharged from the air outlet 14 is obtained again through the dust concentration detector 40 after the operation is continuously carried out 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 main air inlet pipe valve 35 is increased, the opening degree of the branch air inlet pipe valve 36 is increased, after the continuous operation is carried out for a period of time, the dust concentration detector 40 is used for obtaining a dust concentration signal in the gas discharged from the air outlet 14 again, 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.
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 14Real timeAnd the historical average dust concentration value lambda of the air outlet 14AverageCalculating according to the following formula to obtain the current real-time dust difference rate kReal time；
kReal time＝(λReal time-λAverage)/λAverage
The current real-time dust difference value kReal timeThe difference value k from the preset dust valueSetting upComparing;
if k isReal timeGreater than a predetermined dust difference kSetting upThe dust concentration in the discharged gas does not reach the standard;
if k isReal timeLess than or equal to the preset dust difference rate kSetting upThe dust concentration in the discharged gas reaches the standard;
wherein k isSetting upThe specific value of (a) is determined according to the average particle size of the limestone entering the lime kiln.
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 lambdaAverage。
In the above control method, kSetting upThe relationship with the average particle size of the limestone entering the lime kiln is shown in the following table.
Figure BDA0002259932120000061
Figure BDA0002259932120000071
The winnowing removal device for fine particle dust in the lime kiln of the embodiment utilizes the 'taking away' and 'suspending' action of fluid on fine particles in hydrodynamics, and controls the air speed of air flow entering the chute cover body 10 from the lower part in the range of 'suspending' limestone material particles with larger particle size and 'taking away' 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 adopts a chute type structure, so that the materials can be effectively separated from larger particle materials and smaller particle powder materials on the winnowing chute panel 20 in the process of slowly moving downwards, and the k value of the winnowing removal device is between 0.8 and 0.9.
Further, in the operation process of the air separation device, the weighing device 60 is used for acquiring the overall weight of the air separation device and sending the overall weight information of the air separation device to the controller, and when the overall weight of the air separation device exceeds a set value, the controller is controlled to start the nodule cleaning device to clean calcified nodules in the air separation device.
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, the lime kiln is further provided with an air separation device according to embodiment 1 of the present invention, and the discharge port 110 of the lime kiln is communicated with a feed port 11 of the air separation device. The structure of the winnowing device is the same as that of embodiment 1, and the details are not repeated herein.
A bearing ring plate 120 is arranged at a lime kiln discharge port 110 on a kiln body 100, the top of the chute cover body 10 is connected with the bearing ring plate 120 through a suspension device 50, so that the feed port 11 of the chute cover body 10 is in soft connection with the lime kiln discharge port 110, a weighing device 60 is arranged on the suspension device 50, and the chute cover body 10 is connected with a lump removing device (not shown in the figure). The whole weight of the winnowing device is weighed through the weighing device 60, and when the whole weight of the winnowing device rises steeply, calcified nodules in the chute cover body 10 are judged, and at the moment, the nodule cleaning device is opened to clean the calcified nodules in the chute cover body 10.
Generally, by adopting the air separation device and the lime kiln with the air separation device, a large amount of dust such as lime powder ore and residues after coal powder burning contained in the finished lime product 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; the dust collecting device is arranged at the air outlet 14, so that the dust materials separated by winnowing can be collected, the resource can be recycled, and the dust collecting device has obvious effects of saving the process cost and improving the process economic benefit; by carrying out flexible connection on the air separation device and the lime kiln body 100 and arranging the weighing device 60 and the nodule removing device, calcified nodules in the air separation device can be timely removed, so that the air separation device can still normally run under the condition of high environmental humidity.
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 (3)

1. A method of controlling an air classification apparatus for removing fine particle dust of a lime kiln, the air classification apparatus comprising:
the chute cover body (10), the top of the chute cover body (10) is provided with a feed inlet (11), and the bottom of the chute cover body (10) is provided with a discharge outlet (12);
the air separation chute cover comprises an air separation chute panel (20), wherein the air separation chute panel (20) is obliquely arranged in an inner cavity of the chute cover body (10), a plurality of air distribution holes (21) are formed in the air separation chute panel (20), an oblique air separation channel (13) is formed between the upper side face of the air separation chute panel (20) and the side wall of the chute cover body (10), and two ends of the air separation channel (13) are respectively communicated with the feeding hole (11) and the discharging hole (12);
the air intake device (30) is installed below the air separation chute panel (20), the air intake device (30) is used for blowing air flow to the lower side of the air separation chute panel (20), an air outlet (14) is formed in the chute cover body (10), and the air outlet (14) is communicated with the air separation channel (13);
a reducing necking (15) is arranged on the chute cover body (10), one end of the reducing necking (15) is communicated with the air separation channel (13), the other end of the reducing necking (15) is communicated with the air outlet (14), and the caliber of one end, close to the air outlet (14), of the reducing necking (15) is smaller than that of one end, close to the air separation channel (13); the plurality of air distribution holes (21) on the air separation chute panel (20) are arranged in a rectangular array or an annular array;
the air intake device (30) includes:
the annular air duct (31) is arranged on the outer side of the lower part of the chute cover body (10);
the output end of the fan (32) is communicated with the annular air duct (31) through a main air inlet pipe (34);
one end of each air inlet branch pipe (33) is communicated with the annular air channel (31), the other end of each air inlet branch pipe (33) is communicated with the lower part of the inner cavity of the chute cover body (10), the number of the air inlet branch pipes (33) is multiple, and the air inlet branch pipes (33) are arranged on multiple side surfaces of the chute cover body (10);
an air inlet main pipe valve (35) is arranged on the air inlet main pipe (34), and an air inlet branch pipe valve (36) is arranged on the air inlet branch pipe (33);
the top of the chute cover body (10) is in flexible connection with a discharge hole (110) of the lime kiln through a suspension device (50), a weighing device (60) is arranged on the suspension device (50), and the chute cover body (10) is also connected with a lump removing device;
the winnowing device still includes a control system, control system includes:
a dust concentration detector (40), the dust concentration detector (40) being installed at the air outlet (14) for detecting the concentration of dust in the gas discharged from the air outlet (14);
the dust concentration detector (40), the fan (32), the air inlet main pipe valve (35), the air inlet branch pipe valve (36), the weighing device (60) and the tumor cleaning device are all connected with the controller;
the control method is characterized by comprising the following steps:
s100: acquiring a dust concentration signal in the gas discharged from the air outlet (14) 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 (14) 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 (14) 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 (14) 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.
2. The method as claimed in claim 1, wherein the determining whether the concentration of dust in the discharged gas reaches the standard by the controller comprises:
the dust concentration value lambda in the gas discharged from the air outlet (14)Real timeAnd the historical average dust concentration value lambda of the air outlet (14)AverageCalculating according to the following formula to obtain the current real-time dust difference rate kReal time；
kReal time＝(λReal time-λAverage)/λAverage
The current real-time dust difference value kReal timeThe difference value k from the preset dust valueSetting upComparing;
if k isReal timeGreater than a predetermined dust difference kSetting upThe dust concentration in the discharged gas does not reach the standard;
if k isReal timeLess than or equal to the preset dust difference rate kSetting upThe dust concentration in the discharged gas reaches the standard;
wherein k isSetting upThe specific value of (a) is determined according to the average particle size of the limestone entering the lime kiln.
3. The method for controlling an air separation plant for removing fine particulate dust from a lime kiln as set forth in claim 1, further comprising:
s500: in the operation process of the air separation device, the weighing device (60) is used for acquiring the whole weight of the air separation device and sending the whole weight information of the air separation device to the controller, and when the whole weight of the air separation device exceeds a set value, the controller is controlled to start the nodule cleaning device to clean calcified nodules in the air separation device.
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