CN111039581A - Key type lime vertical kiln material distribution system and material distribution method - Google Patents
Key type lime vertical kiln material distribution system and material distribution method Download PDFInfo
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- CN111039581A CN111039581A CN202010007127.1A CN202010007127A CN111039581A CN 111039581 A CN111039581 A CN 111039581A CN 202010007127 A CN202010007127 A CN 202010007127A CN 111039581 A CN111039581 A CN 111039581A
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
A piano key type lime shaft kiln distributing system and a distributing method comprise the following steps: the device comprises a rotary base frame, a feeding pipe, a distributing table, a distributing pipe and a piano key type blanking mechanism; the rotary base frame is erected on the outer side of the lime feeding hole, the rotation axis of the rotary base frame is overlapped with the axis of the lime feeding hole, and the middle of the rotary base frame is provided with a feeding hole which is communicated up and down; the lower end of the feeding pipe is communicated with the upper end of the material through hole; the distributing table is arranged in the middle of the material through hole, the piano key type blanking mechanism is arranged in the material distributing table, and the plate body rotating mechanism is arranged at the bottom end of the material distributing pipe; one end of each blanking plate is connected with the plate body rotating mechanism, and the blanking plates are horizontally arranged along the radius direction of the inner cavity of the kiln body; the plurality of blanking plates support lime in the feeding pipe, and the plate body rotating mechanism drives the blanking plates to overturn downwards for blanking. The technical scheme that this application provided can make the difference in height of the lime ring charge level in the kiln body in certain extent, prevents the insufficient condition of lime burning, improves the lime quality.
Description
Technical Field
The invention relates to an even material distribution system, in particular to a piano key type lime shaft kiln material distribution system, belonging to the technical field of limestone sintering; the invention also relates to a piano key type lime shaft kiln material distribution method.
Background
As the general lime refers to quicklime (CaO), which is an important auxiliary raw material widely applied in the metallurgical industry, in the processes of sintering of ironmaking raw materials, ironmaking reduction, pretreatment of molten iron and external refining, the 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 ironmaking and steelmaking processes.
The lime shaft kiln is the core equipment in the lime production process, and raw material limestone is heated to 1100 ℃ in the lime shaft kiln and calcined to generate the product lime. At present, the widely used lime shaft kiln mainly adopts a shaft kiln. The patent is also provided mainly for lime shaft kilns.
The lime shaft kiln process and the device structure thereof in the prior art are as follows: limestone is added into lime shaft kiln from upper portion internally, pile up into the bed of material of certain thickness in lime shaft kiln, the bed of material is slowly down along with carrying out of production, spout the suitable buggy of even equivalent granularity in piling up the bed of material through coal injection house steward and buggy spray gun simultaneously, make it evenly arrange in the bed of material of buggy spray gun export horizontal cross-section, the pulverized coal burning is exothermic under high temperature, for the even suitable heat of bed of material supply, thereby make the bed of material react on one side down, end the reaction when reacing lime shaft kiln body lower part position, final finished product ore is discharged to the platform truck by the bin outlet on, be transported to next process. On the other hand, the combustion-supporting air blown from the lower part of the kiln body penetrates through the material layer from bottom to top, and sufficient combustion-supporting air is provided for pulverized coal combustion.
In the prior art, the lime shaft kiln adopts single-opening blanking, so that two technical problems exist. The first technical problem is that the cloth state is not ideal: in the lime shaft kiln in the prior art, limestone is fed from a middle single opening, so a hill-shaped piled material layer with thick middle and thin edge is easily formed in the vertical cooler. The material distribution state of the material layer is very unfavorable for the production of the lime shaft kiln with strict material distribution and air flow distribution requirements. Whereas a second technical problem arises due to the first technical problem: poor roasting effect: in the heat exchange process, because the material distribution state is not ideal, combustion air easily forms a short circuit, the pressure loss of a thick material layer in the middle is large when the air passes through a limestone material layer from bottom to top, and the pressure loss is small when the air passes through a thin material layer at the edge, so that a large amount of combustion air passes through the thin material layer at the edge with small pressure loss for supporting combustion, and a small amount of combustion air passes through the thick material layer at the middle with large pressure loss for supporting combustion, so that the phenomenon that pulverized coal in the limestone material layer is not uniformly combusted is easily formed, the phenomena that the temperature of a middle mineral aggregate is low and the temperature of the material layer at the edge is high after production is finished are caused.
Therefore, how to provide a piano type lime shaft kiln material distribution system, which can make the material distribution of the lime shaft kiln uniform and improve the lime sintering quality, is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to judge whether the height of the limestone charge level is uniform or not by actively monitoring the height difference of all the charge level rings, and if the height of the limestone charge level is not uniform, the charge level rings are charged by a piano key type charging device. The invention provides a piano key type lime shaft kiln distributing system, which comprises: the device comprises a rotary base frame, a feeding pipe, a distributing table, a distributing pipe and a piano key type blanking mechanism; the rotary base frame is erected on the outer side of the lime feeding hole, the rotation axis of the rotary base frame is overlapped with the axis of the lime feeding hole, and the middle of the rotary base frame is provided with a feeding hole which is communicated up and down; the lower end of the feeding pipe is communicated with the upper end of the material through hole; the material distribution platform is arranged in the middle of the material through hole, and an annular gap is formed between the outer edge of the material distribution platform and the inner wall of the material through hole; the distributing pipe is arranged in the kiln body, and the upper end of the distributing pipe is connected with the rotary base frame and communicated with the annular gap; the piano key type blanking mechanism is arranged at the lower end of the distributing pipe.
According to a first embodiment provided by the invention, a piano type lime shaft kiln burden distribution system is provided:
a piano key type lime shaft kiln distributing system comprises: a kiln body; the top of the kiln body is provided with a lime feeding hole; the bottom of the kiln body is provided with a lime discharge hole; the piano type cloth device includes: the device comprises a rotary base frame, a feeding pipe, a distributing table, a distributing pipe and a piano key type blanking mechanism; the rotary base frame is erected on the outer side of the lime feeding hole, the rotation axis of the rotary base frame is overlapped with the axis of the lime feeding hole, and the middle of the rotary base frame is provided with a feeding hole which is communicated up and down; the lower end of the feeding pipe is communicated with the upper end of the material through hole; the material distribution platform is arranged in the middle of the material through hole, and an annular gap is formed between the outer edge of the material distribution platform and the inner wall of the material through hole; the distributing pipe is arranged in the kiln body, and the upper end of the distributing pipe is connected with the rotary base frame and communicated with the annular gap; the piano key type blanking mechanism is arranged at the lower end of the distributing pipe.
Preferably, the piano key type blanking mechanism includes: a blanking plate and a plate body rotating mechanism; the plate body rotating mechanism is arranged at the bottom end of the distributing pipe; one end of each blanking plate is connected with the plate body rotating mechanism, and the blanking plates are horizontally arranged along the radius direction of the inner cavity of the kiln body; the plurality of blanking plates support lime in the feeding pipe, and the plate body rotating mechanism drives the blanking plates to overturn downwards for blanking.
Preferably, the apparatus further comprises: a kick-out plate; one end of the kick-out plate is arranged on the inner wall of the rotary base frame, and the other end of the kick-out plate extends into the upper part of the distributing table; and the kick-out plate is positioned right above the distributing pipe.
Preferably, the apparatus further comprises: a material shifting swing seat; one end of the kick-out plate is arranged on the inner wall of the rotary base frame through the kick-out swinging seat, and the kick-out plate is driven by the kick-out swinging seat to swing in parallel to the upper surface of the material distributing table; preferably, the cutting angle θ formed by the rotational tangency of the material-shifting plate and the material-shifting swing seatnIs 0 to 90 degrees; preferably thetanIs 0 to 60 degrees; more preferably thetanIs 0-30 degrees.
Preferably, the number of the blanking plates is n, n is 2-100, preferably n is 4-50, and more preferably n is 5-20.
Preferably, the spreading angle α of the blanking plate is 0-90 degrees, preferably α is 0-60 degrees, more preferably α is 0-30 degrees;
preferably, the distributing pipes, the piano type blanking mechanisms, the shifting plates and the shifting swing seats which are in one-to-one correspondence form a group of blanking units; the piano type cloth device includes: a plurality of groups of blanking units; the blanking units are arranged below the rotary base frame along a circumferential array.
Preferably, the apparatus comprises: a charge level height detector; the level height detector includes: the detection rod and the detection main body; the detection main body is arranged on the side wall of the kiln body along the circumference; one end of the detection rod is in signal connection with the detection main body, and the other end of the detection rod extends into the kiln body; preferably, the number of the material level height detectors is the same as that of the blanking plates, and the material level height detectors detect material layer heights with different radiuses.
Preferably, the level height detector detects a level height value Δ of each ring of the lime shaft kiln in a horizontal cross sectionnObtaining the required supplementary feeding quantity Q of the nth ring charge level according to the following formula (1)n(ii) a Then obtaining the cutting angle theta of the kick-out plate when processing the nth ring material surface according to the formula (2)nThe value of (c):
Qn＝(Δmax-Δn)×Sn(1)；
θn＝arctan(aQn+b) (2)；
wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b is the coefficient of system in-system, a is the [0,1 ]]，b∈[10,50](ii) a Preferably a ∈ [0.2,0.8 ]]，b∈[20,40](ii) a More preferably a ∈ [0.4,0.6 ]]，b∈[25,35]。
Preferably, the rotation speed V corresponding to the rotating base frame at the time of processing the n-th loop facet is obtained according to the following formula (3)nThe time t of the blanking plate staying at the opening angle of α degrees is obtained according to the following formula (4)n；
Vn＝c×Qn+d×rn(3)
Wherein r isnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; c. d, e are coefficient in system, c belongs to [0,1 ]]，d∈[1,5]，e∈[0,5](ii) a Preferably c ∈ [0.2,0.8 ]]，d∈[2,4]，e∈[0.1,3](ii) a More preferably c ∈ [0.4,0.6 ]]，d∈[2.5,3.5]，e∈[0.2,2](ii) a L is the length of the blanking plate 20501.
Preferably, the apparatus comprises: a carbon residue detector; the carbon residue detector is arranged at the lime discharge port; recording the carbon residue content ratio detected by the carbon residue detector as gamma; maximum allowable carbon residue ratio gamma of lime shaft kilnmax5% -20%;
preferably, the maximum allowable carbon residue ratio γ is for a single-shaft lime shaft kilnmax15 percent;
maximum allowable carbon residue ratio gamma for double-barrel lime shaft kilnmaxIs 5%;
maximum allowable carbon residue ratio gamma for sleeve lime shaft kilnmaxThe content was 10%.
Preferably, the blanking plate is a straight plate, and the length direction of the blanking plate is perpendicular to the radius of the inner cavity of the kiln body.
Preferably, the blanking plate is arc-shaped, and the curvature of the blanking plate is consistent with the curvature of the circumference of the inner cavity of the kiln body at the position.
Preferably, the rotating base frame includes: a loop, a driving device and a travelling wheel; the loop is arranged at the outer side of the lime feeding hole; the driving device is arranged on the loop through the travelling wheel.
According to a second embodiment provided by the invention, a method for uniformly distributing materials in a lime shaft kiln is provided:
a method of piano type lime shaft kiln burden distribution or a method of using a piano type lime shaft kiln burden distribution system of the first embodiment, comprising the steps of:
1) monitoring discharged carbon residue: real-time detection of residual carbon content gamma of lime discharge port of lime shaft kilnMeasuring(ii) a If gamma isMeasuring≤γmaxContinuing to operate; if during time t, γMeasuring＞γmaxEntering step 2);
2) and (3) judging the fault reason: detecting height delta of each ring material surface in lime shaft kilnnObtaining the height difference k between each material level and the highest material leveln，kn＝△max-△n(ii) a If k isn≤kmax，kmaxThe maximum allowable height difference is obtained, and the air quantity of combustion-supporting air is increased; if k isn＞kmaxFeeding materials to each ring material surface in the next step;
3) detecting to obtain the feed amount: according to ΔnTo obtain the required feeding quantity Q of the nth ring charge leveln；
4) Controlling material stirring: according to QnControlling the kick-out plate to cut in at an angle thetanAnd a rotation speed VnStirring the materials;
5) controlling blanking: according to the required feeding quantity Q of the nth ring charge levelnAngle of cut theta with the kick-out platenControlling the opening time t of the nth blanking platen。
Preferably, step 2) further comprises: 2a) determining the ring number n of a ring-shaped charge level formed by the piano key type blanking mechanism in the first embodiment in the lime shaft kiln;
preferably, in step 3), the required additional charge Q of the nth ring charge level is obtained according to the formula (1)n：
Qn＝(Δmax-Δn)×Sn(1)；
Wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown;
preferably, in the step 4), the cutting angle θ when the material-shifting plate processes the nth ring plane is obtained according to the formula (2)n(ii) a Obtaining the corresponding rotating speed V when the material shifting plate processes the nth ring material surface according to the formula (3)n：
θn＝arctan(aQn+b) (2)；
Vn＝c×Qn+d×rn(3)；
Wherein，rnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b, c and d are coefficient in system, a belongs to [0,1 ]]，b∈[10,50]，c∈[0,1]，d∈[1,5](ii) a Preferably a ∈ [0.2,0.8 ]]，b∈[20,40]，c∈[0.2,0.8]，d∈[2,4](ii) a More preferably a ∈ [0.4,0.6 ]]，b∈[25,35]，c∈[0.4,0.6]，d∈[2.5,3.5]。
Preferably, in the step 5), the time t for the blanking plate to stay under the opening angle of α degrees is obtained according to the formula (4)n：
Wherein e is a system internal coefficient, and e belongs to [0,5 ]; preferably e ∈ [0.1,3 ]; more preferably e ∈ [0.2,2 ]; l is the length of the blanking plate 20501.
Preferably, in step 1), the allowable maximum carbon residue ratio gamma is 15% for the single-cylinder lime shaft kiln, if gamma is more than 15% and the duration t reaches 5-6min, the carbon residue detector sends out a prompt signal of incomplete lime combustion;
for a double-barrel lime vertical kiln, the allowed maximum carbon residue ratio gamma is 5%, if gamma is more than 5% and the duration time t reaches 8-9min, the carbon residue detector sends out a prompt signal of incomplete lime combustion;
for the sleeve lime vertical kiln, the allowed maximum carbon residue content gamma is 10%, if gamma is more than 10% and the duration t reaches 7-8min, the carbon residue detector sends out a prompt signal of incomplete lime combustion.
In this application, the rotating bed frame drives the rotation of cloth pipe and piano type unloading mechanism in the top of setting at the lime feed inlet. Lime enters the kiln body from the feeding pipe, falls on the material distribution platform after leaving the feeding pipe, and is accumulated on the material distribution platform. When lime is piled up to a certain degree on the piling platform, the lime enters the distributing pipe from the outer edge of the distributing platform. Then fall onto different ring material surfaces under the action of the blanking plate. Lower flitch keeps the level under plate body rotary mechanism's effect, when needs feed in raw material to a certain ring charge level, drives the lower flitch that corresponds on the position downwards upset again, and the lime that this lower flitch bore falls into on the ring charge level that needs feed in raw material from the position of this lower flitch. Through the cooperation of swivel bed frame, cloth pipe, key formula unloading mechanism to, can adopt under the condition of single inlet pipe and single feed inlet at lime shaft kiln, with the accurate shop of lime at the kiln internal to make the difference in height of the internal lime ring charge level of kiln in certain extent, prevent the insufficient condition of lime burning, improve the lime quality.
In this application, follow rotatory bed frame through the switch-plate and rotate, will divide the lime material of material bench to spill the distributing pipe as required, the weight of the lime of keeping in the regulation and control distributing pipe that can be accurate prevents that the intraductal lime of distributing pipe is too much, increases whole weight. The rotating load of the rotating base frame is reduced.
In this application, through dialling the material swing seat, can adjust the group material angle of switch plate. The different kickoff cut-in angles of the kickoff plate and the different depths of the kickoff plate cutting into the lime stacked on the material distribution table. The larger the cutting angle is, the more lime is stirred out by the stirring plate in a unit angle rotating along with the rotating base frame, and the more lime falls into the distributing pipe.
In this application, when the switch-in angle of the switch-plate is 90 degrees, namely the switch-plate points to the center of the material distributing table, the switch-out amount of the switch-plate is the largest.
In this application, the more the quantity of flitch down, then the ring charge level that piano key formula unloading mechanism can the stone material is more, denser more, is favorable to the accurate regulation of ring charge level to the lime in the kiln body.
In the present application, the larger the opening angle α of the blanking plate, the larger the opening of the blanking plate, i.e., the larger the value L × sin α, the larger the blanking amount per unit time.
It should be noted that in the formula referred to in the present application, the values of the parameters a, b, c, d, e are obtained through experimental tests of the lime shaft kiln during the actual production process, and the specific parameter values are gradually corrected through machine learning during the actual production process.
In the present application, the system may be based on the radius r of the current treatment levelnCalculating the blanking plates needing to be opened, in a specific embodiment of the application, equally dividing the blanking groove into 9 parts, corresponding to 9 blanking plates, and then respectively corresponding radius values are as follows:
the height of the ring material surface with different rn values and the radius rn value of the ring material surface needing material supplement can be monitored by the material surface height detector, and the radius range of the ring material surface needing material supplement can be maximally reached, so that the blanking plate corresponding to the radius range is controlled to carry out blanking.
The numerical range of the value is located, and the serial number of the blanking plate needing to be opened can be judged
The larger the opening angle α, the larger the discharge amount of lime in the material distribution pipe from the opened blanking plate in unit time, in the process of actual control, the rotation of the rotating base frame basically keeps constant-speed rotation, but different areas on the same material ring surface have different height differences, when the height of a certain position of a certain material ring surface is too low, the blanking plate passes through the position, the opening angle is increased, the blanking amount is increased, and the effect of completing one-pass filling is realized.
It should be noted that when the opening angle α of the blanking plate is opened by a certain angle, such as 60-90 degrees, the lower end of the blanking plate can also be abutted against the annular charge level to scrape the annular charge level, i.e. the lime on the annular charge level with high horizontal height is pushed to two sides by the lower end of the blanking plate, so that the height difference of the lime charge level in the whole kiln body meets the process requirementnK is not more than kmax。
In this application, through multiunit unloading unit, can add material to different ring material faces simultaneously. The number of the blanking units is 1-20, preferably 2-10; more preferably 4-8 sets. The number of the material distribution devices is briefly divided, and the devices are respectively responsible for the material distribution adjustment work of 1-2 ring material surfaces in the kiln, as shown in table 1:
after the system obtains the calculated values (the cut-in angle and the rotation speed of the kick-out plate, the serial number of the blanking plate to be opened and the opening time), the adjusting devices such as the kick-out plate, the plate body rotating mechanism and the like are automatically controlled to carry out online adjustment until the height difference of the charge level detected in the kiln is within the normal range.
In this application, through charge level height detector, can the inside charge level condition of lime of real-time supervision kiln body. Through temperature monitoring, can know in real time whether the temperature of lime charge level meets the demands, if the height of a certain ring charge level is higher, the combustion gas that flows through this department reduces to the temperature that leads to this department is lower than other regions, thereby can't satisfy the technological requirement. In addition, through height monitoring, the height condition of each ring charge level can be further detected, so that which ring charge levels need to be further charged is judged.
In the application, the feeding amount Qn required by a certain loop charging surface is calculated through the height difference (△ max- △ n), then the cutting angle theta n of the material stirring plate is adjusted to control the amount of lime entering a material distribution pipe, the feeding speed of one rotation is controlled through adjusting the rotating speed Vn of the rotating base frame, and finally the amount of the lime fed from the piano type feeding mechanism to the charging surface in unit time is controlled through controlling the opening time of the feeding plate.
In this application, the abundant degree of the inside lime stone calcination reaction of kiln body is judged through the carbon content of the material of the lime discharge gate of the detection kiln body. The chemical reaction of limestone in the kiln body is as follows:
CaCO3→CaO+CO2↑
that is, if the reaction of limestone in the kiln body is insufficient, the content of calcium carbonate at the discharge port is large, i.e. the residual carbon amount is large.
It is to be noted that different types of lime shaft kiln allow different amounts of carbon residue. The reaction degree inside the kiln body has certain fluctuation. The detection reference is that when the carbon residue value is greater than the rated value within a certain time t, the internal combustion of the kiln body is judged to be insufficient.
In this application, the flitch is the straight plate type, or is the arc. When the flitch is the arc down, can be more accurate from this flitch department exhaust limestone of flitch of unloading fall on treating reinforced charge level.
In the application, the loop is fixed on the kiln body, or the loop is fixed on a support frame outside the kiln body.
In the second embodiment, the residual carbon amount gamma of the lime discharge hole of the lime shaft kiln is detected, and if the values of the residual carbon amount gamma in the time t are all more than 5%, the condition that the combustion in the lime shaft kiln is incomplete is judged. The reasons for this situation are generally divided into two types, one is that the whole combustion area in the kiln body is not fully combusted due to insufficient combustion-supporting air quantity introduced into the kiln body, namely insufficient oxygen supply; the other is caused by uneven spreading of limestone materials in the kiln body, and the combustion of partial areas in the kiln body is insufficient. For the first reason, the problem is solved by increasing the amount of the combustion-supporting gas; the second reason is solved by feeding the annular charge level with a low height. If the combustion is not sufficient, the height difference k of the annular charge level is judged preferentiallynIf the height difference k isn≦ maximum allowable height difference kmaxIf so, the horizontal height of each ring material surface is relatively uniform, and the reason for insufficient combustion is judged to be insufficient combustion-supporting gas; on the contrary, if the height difference knMaximum allowable height difference kmaxWhen it is judged that the partial combustion is insufficient due to the uneven level of the charge level, △ is obtained based on the measured heights of the charge ringsnHeight △ of highest material levelmaxHeight difference (△)max-△n) Calculating the amount Q of the materials to be fed of each ring material surfacen. Then according to QnObtaining the cutting angle theta of the kick-out platenTo control the amount of limestone entering the distribution pipe. And according to QnObtaining the rotation speed V of the rotating base framenAnd controlling the material distribution period. Finally, the opening time t of the blanking plate is controllednTo control the feeding amount on the partial ring material surface. By the method, the ring material surfaces of the limestone in the kiln body can be paved. Adopt the scheme that this application provided, can the internal burning condition of real-time detection kiln to in time discover the insufficient problem of burning according to the burning condition, again according to the different reasons that lead to the problem to produce, carry out further increase combustion-supporting gas or adjust the operation of each ring charge level height. The degree of difficulty of artificial operation can be reduceed, the degree of accuracy of cloth is improved, the conversion rate of lime is finally improved in the lime burning, and the product quality is improved.
In the present application, formula QnThe value of (A) is the area S of the ring charge levelnMultiplied by the height difference (△)max-△n). Wherein the area Sn of the ring charge level can pass through the outer edge radius r of each ring charge levelOuter coverAnd rInner partAnd (4) solving according to a circle area formula.
In the present application, the plunge angle θnThe larger the stirring plate is, the larger the amount of limestone which can be stirred to the distributing pipe is in a unit rotating angle. I.e. thetanValue of (D) and charging level Q of each ring levelnIn a proportional relationship. At the same time, at the same charging amount QnUnder the condition that the material-surrounding surfaces at different radius distances need different blanking amounts within the same rotation angle, namely the same feeding amount QnWhen the feeding amount is divided into the ring material surfaces with different circumferences, the feeding amount in unit angle is different. So thetanThe value of (D) and the diameter d of each ring levelnIn inverse proportion.
In the application, in the specific material distribution process, the feeding time of each loop material surface is generally controlled, namely the required feeding quantity Q of each loop material surfacenThe larger the radius rnThe larger the rotation speed, the more VnIs large.
In the application, the opening time tn of the blanking plate corresponding to the ring material surface needing to be fed is in direct proportion to the feeding amount Qn of the ring material surface, and in inverse proportion to the cutting angle theta n and the rotating speed Vn of the shifting plate.
In the present application, the height of the lime shaft kiln is generally 5-50 meters, preferably 5.5-48 meters, preferably 6-45 meters, more preferably 7-40 meters, and even more preferably 8-35 meters. The outer diameter of the lime shaft kiln body is generally 3 to 30 meters, preferably 4 to 25 meters, preferably 5 to 22 meters, more preferably 6 to 20 meters, and still more preferably 7 to 18 meters.
Compared with the prior art, the scheme of the invention has the following advantages:
1. the cloth state is ideal: because the blanking plate in the furnace can form a plurality of circles of small hill-shaped charge level states in the furnace in the rotating process, and the charge level detectors can monitor the heights of all the charge levels in real time and control the rotation of the shifting plates, the heights of all the charge levels in the furnace can be guaranteed to be basically uniform in real time, so that a more ideal material distribution state in the furnace is formed;
2. the roasting effect is good: because the material distribution state is stable, the heights of all the ring material surfaces tend to be uniform, the situations that combustion-supporting air is short-circuited, a large amount of combustion-supporting air passes through the edge thin material layer with small pressure loss for supporting combustion and a small amount of combustion-supporting air passes through the middle thick material layer with large pressure loss for supporting combustion are not easy to occur in the heat exchange process, so that the phenomenon that pulverized coal in the limestone material layer is combusted unevenly is effectively avoided, and the quality index of the limestone finished product ore is effectively improved.
In conclusion, the novel technical scheme effectively makes up for a plurality of defects existing in the prior technical scheme, is more energy-saving, reliable and practical compared with the prior art, and can be expected to have good market prospect in the future.
Drawings
FIG. 1 is a schematic view of the overall structure of a piano type lime shaft kiln distributing system provided by the application;
FIG. 2 is a schematic view of a prior art lime shaft kiln;
FIG. 3 is a schematic diagram of the relative positions of the feed pipe and the material distributing table in the piano type material distributing device provided by the present application;
FIG. 4 is a schematic view of a detailed structure of the piano type distributing device provided in the present application;
FIG. 5 is a schematic three-dimensional view of a piano type dispensing device provided herein;
fig. 6 is a top view structural diagram of a piano key type blanking mechanism of the piano key type material distribution device provided by the present application;
fig. 7 is a side view structural diagram of a piano key type blanking mechanism of the piano key type material distribution device provided by the present application;
FIG. 8 is a schematic view of a single piano key type cloth device rotation embodiment provided in the present application;
FIG. 9 is a schematic view of two examples of the rotation of the piano type dispensing device provided in the present application;
FIG. 10 is a schematic view of a four piano key type dispensing device rotation embodiment provided in the present application;
FIG. 11 is a schematic view of a six piano key type dispensing device rotation embodiment provided herein;
FIG. 12 is a flow chart of a method for uniformly distributing materials in a lime shaft kiln provided by the present application.
Reference numerals: 1: a kiln body; 101: a feed inlet; 102: a discharge port; 201: rotating the base frame; 20101: a material inlet is formed; 20102: an annular gap; 20103: a loop; 20104: a drive device; 20105: a traveling wheel; 202: a feed pipe; 203: a material distributing table; 20301: a kick-out plate; 20302: a material shifting swing seat; 204: a distributing pipe; 205: a piano key type blanking mechanism; 20501: a blanking plate; 20502: a plate body rotating mechanism; 3: a charge level height detector; 301: a detection lever; 302: detecting a subject; 4: a carbon residue detector.
Detailed Description
According to a first embodiment provided by the invention, a piano type lime shaft kiln burden distribution system is provided:
a piano key type lime shaft kiln distributing system comprises: a kiln body 1; the top of the kiln body 1 is provided with a lime feeding hole 101; the bottom of the kiln body 1 is provided with a lime discharge hole 102; the piano type cloth device includes: the device comprises a rotary base frame 201, a feeding pipe 202, a material distributing table 203, a material distributing pipe 204 and a piano key type blanking mechanism 205; the rotary base frame 201 is erected outside the lime feeding hole 101, the rotation axis of the rotary base frame 201 is overlapped with the axis of the lime feeding hole 101, and the middle of the rotary base frame 201 is provided with a material passing hole 20101 which is communicated up and down; the lower end of the feeding pipe 202 is communicated with the upper end of the material through opening 20101; the material distribution table 203 is arranged in the middle of the material passing opening 20101, and an annular gap 20102 is formed between the outer edge of the material distribution table 203 and the inner wall of the material passing opening 20101; the distribution pipe 204 is arranged in the kiln body 1, and the upper end of the distribution pipe 204 is connected with the rotary base frame 201 and communicated with the annular gap 20102; the piano key type blanking mechanism 205 is arranged at the lower end of the distributing pipe 204;
wherein, the piano key type blanking mechanism 205 includes: a blanking plate 20501 and a plate body rotating mechanism 20502; the plate body rotating mechanism 20502 is arranged at the bottom end of the distributing pipe 204; one end of each of the plurality of discharging plates 20501 is connected with the plate rotating mechanism 20502, and the discharging plates 20501 are horizontally arranged along the radial direction of the inner cavity of the kiln body 1; the plurality of blanking plates 20501 support lime in the feeding pipe 202, and the plate rotating mechanism 20502 drives the blanking plates 20501 to overturn downwards for blanking.
Preferably, the apparatus further comprises: a material shifting plate 20301; one end of the material shifting plate 20301 is arranged on the inner wall of the rotary base frame 201, and the other end of the material shifting plate 20301 extends into the upper part of the material distributing table 203; and the kick-out plate 20301 is located directly above the charge pipe 204.
Preferably, the apparatus further comprises: a material shifting swing seat 20302; one end of the material shifting plate 20301 is arranged on the inner wall of the rotary base frame 201 through the material shifting swing seat 20302, and the material shifting swing seat 20302 drives the material shifting plate 20301 to swing parallel to the upper surface of the material distributing table 203; preferably, the cutting angle θ formed by the material-shifting plate 20301 and the material-shifting swing seat 20302 in the tangential direction of rotationnIs 0 to 90 degrees; preferably thetanIs 0 to 60 degrees; more preferably thetanIs 0-30 degrees.
Preferably, the number of the blanking plates 20501 is n, n is 2 to 100, preferably n is 4 to 50, and more preferably n is 5 to 20.
Preferably, the spreading angle α of the blanking plate 20501 is 0-90 °, preferably α is 0-60 °, more preferably α is 0-30 °;
preferably, the distributing pipes 204, the piano key type blanking mechanisms 205, the material shifting plates 20301 and the material shifting swing seats 20302 which are in one-to-one correspondence form a group of blanking units; the piano type cloth device includes: a plurality of groups of blanking units; the blanking units are arranged below the rotating base frame 201 along a circumferential array.
Preferably, the apparatus comprises: a charge level height detector 3; the level height detector 3 includes: a detection lever 301, a detection body 302; the detection main body 302 is circumferentially arranged on the side wall of the kiln body 1; one end of the detection rod 301 is in signal connection with the detection main body 302, and the other end of the detection rod 301 extends into the kiln body 1; preferably, the number of the level height detectors 3 is the same as the number of the blanking plates 20501, and the level height detectors 3 detect the level heights of the material layers with different radii.
Preferably, the level height detector 3 detects a level height value Δ for each ring of the lime shaft kiln in a horizontal cross sectionnObtaining the required supplementary feeding quantity Q of the nth ring charge level according to the following formula (1)n(ii) a Then, the cutting angle theta of the material shifting plate 20301 during the process of the nth ring material surface is obtained according to the formula (2)nThe value of (c):
Qn＝(Δmax-Δn)×Sn(1)；
θn＝arctan(aQn+b) (2)；
wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b is the coefficient of system in-system, a is the [0,1 ]]，b∈[10,50](ii) a Preferably a ∈ [0.2,0.8 ]]，b∈[20,40](ii) a More preferably a ∈ [0.4,0.6 ]]，b∈[25,35]。
Preferably, the rotation speed V corresponding to the rotating base frame 201 when processing the nth loop plane is obtained according to the following formula (3)nThe time t for the blanking plate 20501 to stay at the opening angle of α degrees is obtained according to the following formula (4)n；
Vn＝c×Qn+d×rn(3)
Wherein r isnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; c. d, e are coefficient in system, c belongs to [0,1 ]]，d∈[1,5]，e∈[0,5](ii) a Preferably c ∈ [0.2,0.8 ]]，d∈[2,4]，e∈[0.1,3](ii) a More preferably c ∈ [0.4,0.6 ]]，d∈[2.5,3.5]，e∈[0.2,2](ii) a L is the length of the blanking plate 20501.
Preferably, the apparatus comprises: a carbon residue detector 4; the carbon residue detector 4 is arranged at the lime discharge port 102; the carbon residue amount ratio detected by the carbon residue detector 4 is recorded as gamma; the maximum allowable carbon residue proportion gamma max of the lime shaft kiln is 5-20%;
preferably, for a single-cylinder lime shaft kiln, the maximum allowable carbon residue ratio γ max is 15%;
for a double-barrel lime shaft kiln, the allowed maximum carbon residue content ratio gamma max is 5 percent;
for a sleeve lime shaft kiln, the maximum allowable carbon residue ratio γ max is 10%.
Preferably, the blanking plate 20501 is a straight plate, and the length direction of the blanking plate 20501 is perpendicular to the radius of the inner cavity of the kiln body 1.
Preferably, the blanking plate 20501 is arc-shaped, and the curvature of the blanking plate 20501 is consistent with the curvature of the circumference of the inner cavity of the kiln body 1 at the position.
Preferably, the rotating base frame 201 includes: a loop 20103, a driving device 20104 and a travelling wheel 20105; the loop 20103 is arranged on the outer side of the lime feeding hole 101; the drive 20104 is arranged on the loop 20103 by a running wheel 20105.
According to a second embodiment provided by the invention, a method for uniformly distributing materials in a lime shaft kiln is provided:
a method of piano type lime shaft kiln burden distribution or a method of using a piano type lime shaft kiln burden distribution system of the first embodiment, comprising the steps of:
1) monitoring discharged carbon residue: real-time detection of residual carbon content gamma of lime discharge port 102 of lime shaft kilnMeasuring(ii) a If gamma isMeasuring≤γmaxContinuing to operate; if during time t, γMeasuring＞γmaxEntering step 2);
2) and (3) judging the fault reason: detecting height delta of each ring material surface in lime shaft kilnnObtaining the height difference k between each material level and the highest material leveln，kn＝△max-△n(ii) a If k isn≤kmax，kmaxThe maximum allowable height difference is obtained, and the air quantity of combustion-supporting air is increased; if k isn＞kmaxFeeding materials to each ring material surface in the next step;
3) detecting to obtain the feed amount: according to ΔnTo obtain the required feeding quantity Q of the nth ring charge leveln；
4) Controlling material stirring: according to ΔnAnd QnControlling the kick-out plate to cut in at an angle thetanAnd a rotation speed VnStirring the materials;
5) controlling blanking: according to the required feeding quantity Q of the nth ring charge levelnAngle of cut theta with the kick-out platenControlling the opening time t of the nth blanking platen。
Preferably, step 2) further comprises: 2a) determining the ring number n of the ring-shaped charge level formed by the piano type blanking mechanism 205 in the first embodiment in the lime shaft kiln;
preferably, in step 3), the required additional charge Q of the nth ring charge level is obtained according to the formula (1)n：
Qn＝(Δmax-Δn)×Sn(1)；
Wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown;
preferably, in step 4), the cutting angle θ when the material-shifting plate 20301 processes the nth ring material surface is obtained according to the formula (2)n(ii) a Obtaining the corresponding rotating speed V when the material shifting plate 20301 processes the nth ring material surface according to the formula (3)n：
θn＝arctan(aQn+b) (2)；
Vn＝c×Qn+d×rn(3)；
Wherein r isnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b, c and d are coefficient in system, a belongs to [0,1 ]]，b∈[10,50]，c∈[0,1]，d∈[1,5](ii) a Preferably a ∈ [0.2,0.8 ]]，b∈[20,40]，c∈[0.2,0.8]，d∈[2,4](ii) a More preferably a ∈ [0.4,0.6 ]]，b∈[25,35]，c∈[0.4,0.6]，d∈[2.5,3.5]；
Preferably, in step 5), the time t for the blanking plate 20501 to stay at the opening angle of α degrees is obtained according to the formula (4)n：
Wherein e is a system internal coefficient, and e belongs to [0,5 ]; preferably e ∈ [0.1,3 ]; more preferably e ∈ [0.2,2 ]; l is the length of the blanking plate 20501.
Preferably, in step 1), the allowable maximum carbon residue ratio γ for the single-cylinder lime shaft kiln is 15%, and if γ is greater than 15% and the duration t reaches 5-6min, the carbon residue detector 4 sends out a prompt signal of incomplete lime combustion;
for a double-drum lime shaft kiln, the allowed maximum carbon residue ratio gamma is 5%, if gamma is more than 5% and the duration time t reaches 8-9min, the carbon residue detector 4 sends out a prompt signal of incomplete lime combustion;
for the sleeve lime vertical kiln, the allowed maximum carbon residue content gamma is 10%, if gamma is more than 10% and the duration t reaches 7-8min, the carbon residue detector 4 sends out a prompt signal of incomplete lime combustion.
Example 1
A piano key type lime shaft kiln distributing system comprises: a kiln body 1; the top of the kiln body 1 is provided with a lime feeding hole 101; the bottom of the kiln body 1 is provided with a lime discharge hole 102; the piano type cloth device includes: the device comprises a rotary base frame 201, a feeding pipe 202, a material distributing table 203, a material distributing pipe 204 and a piano key type blanking mechanism 205; the rotary base frame 201 is erected outside the lime feeding hole 101, the rotation axis of the rotary base frame 201 is overlapped with the axis of the lime feeding hole 101, and the middle of the rotary base frame 201 is provided with a material passing hole 20101 which is communicated up and down; the lower end of the feeding pipe 202 is communicated with the upper end of the material through opening 20101; the material distribution table 203 is arranged in the middle of the material passing opening 20101, and an annular gap 20102 is formed between the outer edge of the material distribution table 203 and the inner wall of the material passing opening 20101; the distribution pipe 204 is arranged in the kiln body 1, and the upper end of the distribution pipe 204 is connected with the rotary base frame 201 and communicated with the annular gap 20102; the piano key type blanking mechanism 205 is arranged at the lower end of the distributing pipe 204.
Example 2
Repeating embodiment 1, the piano key type blanking mechanism 205 comprises: a blanking plate 20501 and a plate body rotating mechanism 20502; the plate body rotating mechanism 20502 is arranged at the bottom end of the distributing pipe 204; one end of each of the plurality of discharging plates 20501 is connected with the plate rotating mechanism 20502, and the discharging plates 20501 are horizontally arranged along the radial direction of the inner cavity of the kiln body 1; the plurality of blanking plates 20501 support lime in the feeding pipe 202, and the plate rotating mechanism 20502 drives the blanking plates 20501 to overturn downwards for blanking.
Example 3
Example 2 was repeated except that the apparatus further included: a material shifting plate 20301; one end of the material shifting plate 20301 is arranged on the inner wall of the rotary base frame 201, and the other end of the material shifting plate 20301 extends into the upper part of the material distributing table 203; and the kick-out plate 20301 is located directly above the charge pipe 204.
Example 4
Example 3 is repeated except that the apparatus further comprises: a material shifting swing seat 20302; one end of the material shifting plate 20301 is arranged on the inner wall of the rotary base frame 201 through the material shifting swing seat 20302, and the material shifting swing seat 20302 drives the material shifting plate 20301 to swing parallel to the upper surface of the material distributing table 203.
Example 5
Example 4 was repeated except that the cutting angle θ formed by the material-ejecting plate 20301 and the tangential direction of rotation of the material-ejecting oscillating base 20302 was setnThe number of the blanking plates 20501 is n, n is 6, and the opening angle α of the blanking plates 20501 is 80 °.
Example 6
Example 5 is repeated, except that the distributing pipes 204, the piano type blanking mechanisms 205, the material shifting plates 20301 and the material shifting swing seats 20302 which are in one-to-one correspondence form a group of blanking units; the piano type cloth device includes: a plurality of groups of blanking units; the blanking units are arranged below the rotating base frame 201 along a circumferential array.
Example 7
Example 6 was repeated except that the apparatus included: a charge level height detector 3; the level height detector 3 includes: a detection lever 301, a detection body 302; the detection main body 302 is circumferentially arranged on the side wall of the kiln body 1; one end of the detection rod 301 is in signal connection with the detection main body 302, and the other end of the detection rod 301 extends into the kiln body 1; the number of the material level height detectors 3 is the same as that of the blanking plates 20501, and the material level height detectors 3 detect material layer heights with different radiuses.
Example 8
Example 7 is repeated, except that the level detector 3 detects a level of each ring of the lime shaft kiln having a level of Δ in the horizontal cross sectionnObtaining the required supplementary feeding quantity Q of the nth ring charge level according to the following formula (1)n(ii) a Then, the cutting angle theta of the material shifting plate 20301 during the process of the nth ring material surface is obtained according to the formula (2)nThe value of (c):
Qn＝(Δmax-Δn)×Sn(1)；
θn＝arctan(aQn+b) (2)；
wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b is the coefficient of system in-system, a is the [0,1 ]]，b∈[10,50](ii) a Preferably a ∈ [0.2,0.8 ]]，b∈[20,40](ii) a More preferably a ∈ [0.4,0.6 ]]，b∈[25,35]。
Example 9
Example 8 was repeated except that the rotation speed V corresponding to the rotary base frame 201 at the time of processing the n-th loop plane was obtained according to the following formula (3)nThe time t for the blanking plate 20501 to stay at the opening angle of α degrees is obtained according to the following formula (4)n；
Vn＝c×Qn+d×rn(3)
Wherein r isnTo be aIntegrating the radius value corresponding to the currently processed nth ring charge level; c. d, e are coefficient in system, c belongs to [0,1 ]]，d∈[1,5]，e∈[0,5](ii) a Preferably c ∈ [0.2,0.8 ]]，d∈[2,4]，e∈[0.1,3](ii) a More preferably c ∈ [0.4,0.6 ]]，d∈[2.5,3.5]，e∈[0.2,2](ii) a L is the length of the blanking plate 20501.
Example 10
Example 9 was repeated except that the apparatus included: a carbon residue detector 4; the carbon residue detector 4 is arranged at the lime discharge port 102; the carbon residue amount ratio detected by the carbon residue detector 4 is recorded as gamma; maximum allowable carbon residue ratio gamma of lime shaft kilnmax5 to 20 percent.
Example 11
Example 10 was repeated, except that the maximum allowable carbon residue ratio γ max was 15% for the single-shaft lime shaft kiln.
Example 12
Example 11 is repeated, except that the maximum allowable carbon residue ratio γ is for a double-shaft lime shaft kilnmaxThe content was 5%.
Example 13
Example 12 is repeated, except that for the sleeve lime shaft kiln, the maximum allowable carbon residue ratio γ ismaxThe content was 10%.
Example 14
The embodiment 10 is repeated, except that the feeding plate 20501 is a straight plate, and the length direction of the feeding plate 20501 is perpendicular to the radius of the inner cavity of the kiln body 1.
Example 15
The embodiment 10 is repeated, except that the feeding plate 20501 is arc-shaped, and the curvature of the feeding plate 20501 is consistent with the curvature of the circumference of the inner cavity of the kiln body 1 at the position.
Example 16
Example 14 is repeated except that the rotating base frame 201 includes: a loop 20103, a driving device 20104 and a travelling wheel 20105; the loop 20103 is arranged on the outer side of the lime feeding hole 101; the drive 20104 is arranged on the loop 20103 by a running wheel 20105.
Example 17
A method of piano key lime shaft kiln batching or using the piano key lime shaft kiln batching system of embodiment 13, comprising the steps of:
1) monitoring discharged carbon residue: real-time detection of residual carbon content gamma of lime discharge port 102 of lime shaft kilnMeasuring(ii) a If gamma isMeasuring≤γmaxContinuing to operate; if during time t, γMeasuring＞γmaxEntering step 2);
2) and (3) judging the fault reason: detecting height delta of each ring material surface in lime shaft kilnnObtaining the height difference k between each material level and the highest material leveln，kn＝△max-△n(ii) a If k isn≤kmax，kmaxThe maximum allowable height difference is obtained, and the air quantity of combustion-supporting air is increased; if k isn＞kmaxFeeding materials to each ring material surface in the next step;
3) detecting to obtain the feed amount: according to ΔnTo obtain the required feeding quantity Q of the nth ring charge leveln；
4) Controlling material stirring: according to ΔnAnd QnControlling the kick-out plate to cut in at an angle thetanAnd a rotation speed VnStirring the materials;
5) controlling blanking: according to the required feeding quantity Q of the nth ring charge levelnAngle of cut theta with the kick-out platenControlling the opening time t of the nth blanking platen。
Example 18
Example 17 was repeated except that in step 2) it also included: 2a) determining the ring number n of the ring-shaped charge level formed by the piano type blanking mechanism 205 in the first embodiment in the lime shaft kiln;
example 19
Example 18 was repeated, except that in step 3), the additional charge Q required for the nth charge level was obtained according to equation (1)n：
Qn＝(Δmax-Δn)×Sn(1)；
Wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown;
example 20
Example 19 is repeated except that in step 4), the cut-in angle θ at the time when the material-shifting plate 20301 processes the nth ring material surface is obtained according to the formula (2)n(ii) a Obtaining the corresponding rotating speed V when the material shifting plate 20301 processes the nth ring material surface according to the formula (3)n：
θn＝arctan(aQn+b) (2)；
Vn＝c×Qn+d×rn(3)；
Wherein r isnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b, c and d are coefficient in system, a belongs to [0,1 ]]，b∈[10,50]，c∈[0,1]，d∈[1,5](ii) a Preferably a ∈ [0.2,0.8 ]]，b∈[20,40]，c∈[0.2,0.8]，d∈[2,4](ii) a More preferably a ∈ [0.4,0.6 ]]，b∈[25,35]，c∈[0.4,0.6]，d∈[2.5,3.5]；
Example 21
Example 20 was repeated except that in step 5), the time t for which the blanking plate 20501 stayed at an opening angle of α degrees was obtained according to the formula (4)n：
Wherein e is a system internal coefficient, and e belongs to [0,5 ]; preferably e ∈ [0.1,3 ]; more preferably e ∈ [0.2,2 ]; l is the length of the blanking plate 20501.
Example 22
Example 21 is repeated except that in step 1), the maximum allowable carbon residue ratio γ is 15% for the single-cylinder lime shaft kiln, if γ > 15% and the duration t reaches 5min, the carbon residue detector 4 sends out a prompt signal of incomplete lime combustion;
for a double-drum lime shaft kiln, the allowed maximum carbon residue ratio gamma is 5%, if gamma is more than 5% and the duration time t reaches 8min, the carbon residue detector 4 sends out a prompt signal of incomplete lime combustion;
for the sleeve lime vertical kiln, the allowed maximum carbon residue content gamma is 10%, if gamma is more than 10% and the duration t reaches 7min, the carbon residue detector 4 sends out a prompt signal of incomplete lime combustion.
Claims (12)
1. A piano type lime shaft kiln distributing system is characterized in that a lime shaft kiln comprises: a kiln body (1) and a piano key type material distribution device (2); the top of the kiln body (1) is provided with a lime feeding hole (101); the bottom of the kiln body (1) is provided with a lime discharge hole (102); the piano type cloth device includes: the device comprises a rotary base frame (201), a feeding pipe (202), a material distributing table (203), a material distributing pipe (204) and a piano key type blanking mechanism (205); the rotary base frame (201) is erected on the outer side of the lime feeding hole (101), the rotation axis of the rotary base frame (201) is overlapped with the axis of the lime feeding hole (101), and the middle of the rotary base frame (201) is provided with a material passing hole (20101) which is communicated up and down; the lower end of the feeding pipe (202) is communicated with the upper end of the material passing port (20101); the material distribution platform (203) is arranged in the middle of the material passing opening (20101), and an annular gap (20102) is formed between the outer edge of the material distribution platform (203) and the inner wall of the material passing opening (20101); the distribution pipe (204) is arranged in the kiln body (1), and the upper end of the distribution pipe (204) is connected with the rotary base frame (201) and communicated with the annular gap (20102); the piano key type blanking mechanism (205) is arranged at the lower end of the distributing pipe (204).
2. The piano key lime shaft kiln distribution system of claim 1, wherein the piano key blanking mechanism (205) comprises: a blanking plate (20501) and a plate body rotating mechanism (20502); the plate body rotating mechanism (20502) is arranged at the bottom end of the distributing pipe (204); one ends of the blanking plates (20501) are connected with the plate body rotating mechanism (20502), and the blanking plates (20501) are horizontally arranged along the direction of a connecting line of the rotating axis of the rotating base frame (201) and the center of the rotating base frame (201); the plurality of blanking plates (20501) support lime in the feeding pipe (202), and the plate body rotating mechanism (20502) drives the blanking plates (20501) to overturn downwards for blanking.
3. The piano key type lime shaft kiln distribution system according to claim 1 or 2, wherein the apparatus further comprises: a switch plate (20301); one end of the kick-out plate (20301) is arranged at the placeOn the inner wall of the rotary base frame (201), the other end of the material shifting plate (20301) extends into the upper part of the material distributing platform (203); the material shifting plate (20301) is positioned right above the distributing pipe (204); preferably, the apparatus further comprises: a material shifting swing seat (20302); one end of the material shifting plate (20301) is arranged on the inner wall of the rotary base frame (201) through the material shifting swing seat (20302), and the material shifting swing seat (20302) drives the material shifting plate (20301) to swing in parallel to the upper surface of the material distribution table (203); preferably, the cutting angle theta formed by the rotating tangential direction of the material shifting plate (20301) and the material shifting swing seat (20302)nIs 0 to 90 degrees; preferably thetanIs 0 to 60 degrees; more preferably thetanIs 0-30 degrees.
4. The piano key type lime shaft kiln distribution system according to claim 3, wherein the number of said blanking plates (20501) is n, n is 2-100, preferably n is 4-50, more preferably n is 5-20; and/or
The opening angle α of the blanking plate (20501) is 0-90 degrees, preferably α degrees is 0-60 degrees, more preferably α degrees is 0-30 degrees;
preferably, the distributing pipes (204), the piano key type blanking mechanisms (205), the material shifting plates (20301) and the material shifting swing seats (20302) which are in one-to-one correspondence form a group of blanking units; the piano key type material distribution device comprises a plurality of groups of blanking units; the blanking units are arranged below the rotary base frame (201) along a circumferential array.
5. The piano key type lime shaft kiln distribution system of claim 4, wherein the apparatus comprises: a charge level height detector (3); the level height detector (3) comprises: a detection lever (301) and a detection main body (302); the detection main body (302) is arranged on the side wall of the kiln body (1) along the circumference; one end of the detection rod (301) is in signal connection with the detection main body (302), and the other end of the detection rod (301) is deep into the kiln body (1); preferably, the number of the material level height detectors (3) is consistent with that of the blanking plates (20501), and the material level height detectors (3) detect the material layer heights with different radiuses;
preferably, the height value of each ring material level of the lime shaft kiln on the horizontal cross section detected by the material level height detector (3) is deltanAccording toThe following formula (1) obtains the required supplementary feeding amount Q of the nth ring charge surfacen(ii) a Then according to the formula (2), the cutting angle theta of the material shifting plate (20301) in the process of processing the nth ring material surface is obtainednThe value of (c):
Qn＝(Δmax-Δn)×Sn(1)；
θn＝arctan(aQn+b) (2)；
wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown; a. b is the coefficient of system in-system, a is the [0,1 ]]，b∈[10,50]。
6. The piano key type lime shaft kiln distribution system according to claim 5, wherein the rotation speed V corresponding to the rotary base frame (201) at the time of processing the n-th ring slab is obtained according to the following formula (3)nThe residence time t of the blanking plate (20501) under the opening angle of α degrees is obtained according to the following formula (4)n；
Vn＝c×Qn+d×rn(3)
Wherein r isnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; c. d, e are coefficient in system, c belongs to [0,1 ]]，d∈[1,5]，e∈[0,5](ii) a L is the length of the blanking plate (20501).
7. The piano key type lime shaft kiln distribution system of claim 6, wherein the apparatus comprises: a carbon residue detector (4); the carbon residue detector (4) is arranged at the lime discharge hole (102); the carbon residue content ratio detected by the carbon residue detector (4) is recorded as gamma; maximum allowable carbon residue ratio gamma of lime shaft kilnmax5% -20%;
preferably, the maximum allowable carbon residue ratio γ is for a single-shaft lime shaft kilnmax15 percent;
maximum allowable carbon residue ratio gamma for double-barrel lime shaft kilnmaxIs 5%;
maximum allowable carbon residue ratio gamma for sleeve lime shaft kilnmaxThe content was 10%.
8. The piano type lime shaft kiln burden distribution system according to claim 7, wherein the blanking plate (20501) is of a straight plate type, and the length direction of the blanking plate (20501) is perpendicular to a line connecting the rotation axis of the rotary base frame (201) and the center of the rotary base frame (201); and/or
The blanking plate (20501) is arc-shaped, and the curvature of the blanking plate (20501) is consistent with the curvature of the circumference of the inner cavity of the kiln body (1) at the position.
9. The piano key type lime shaft kiln distribution system of claim 8, wherein the rotary base frame (201) comprises: a loop (20103), a drive (20104), a travelling wheel (20105); the loop (20103) is arranged on the outer side of the lime feeding hole (101); the driving device (20104) is arranged on the loop (20103) through a travelling wheel (20105).
10. A method of piano lime shaft kiln batching or a method of using a piano lime shaft kiln batching system according to any one of claims 1 to 9, the method comprising the steps of:
1) monitoring discharged carbon residue: real-time detection of residual carbon content gamma of lime discharge port 102 of lime shaft kilnMeasuring(ii) a If gamma isMeasuring≤γmaxContinuing to operate; if gamma isMeasuring＞γmaxEntering step 2);
2) and (3) judging the fault reason: detecting height delta of each ring material surface in lime shaft kilnnObtaining the height difference k between each material level and the highest material leveln，kn＝△max-△n；
If k isn≤kmax，kmaxThe maximum allowable height difference is obtained, and the air quantity of combustion-supporting air is increased;
if k isn＞kmaxThen enter intoFeeding materials to each ring material surface;
3) detecting to obtain the feed amount: according to ΔnTo obtain the required feeding quantity Q of the nth ring charge leveln；
4) Controlling material stirring: according to QnControlling the kick-out plate to cut in at an angle thetanAnd a rotation speed VnStirring the materials;
5) controlling blanking: according to the required feeding quantity Q of the nth ring charge levelnAngle of cut theta with the kick-out platenControlling the opening time t of the nth blanking platen。
11. The method for uniformly distributing materials in a lime shaft kiln according to claim 10, wherein the method further comprises the following step 2): 2a) determining the ring number n of a ring-shaped charge level formed by the charging of a piano key type charging mechanism (205) in the lime shaft kiln;
preferably, in step 3), the required additional charge Q of the nth ring charge level is obtained according to the formula (1)n：
Qn＝(Δmax-Δn)×Sn(1)；
Wherein, DeltamaxThe highest point material level detected in the kiln; snThe annular area of each annular material surface on the cross section of the lime shaft kiln is shown;
preferably, in the step 4), the cutting angle theta is obtained according to the formula (2) when the material shifting plate (20301) processes the nth ring material surfacen(ii) a Obtaining the corresponding rotating speed V when the material shifting plate (20301) processes the nth ring material surface according to the formula (3)n：
θn＝arctan(a×Qn+b)(2)；
Vn＝c×Qn+d×rn(3)；
Wherein r isnThe radius value corresponding to the nth ring charge level currently processed by the system is obtained; dInner partThe value is the inner diameter value of the lime shaft kiln; a. b, c and d are coefficient in system, a belongs to [0,1 ]]，b∈[10,50]，c∈[0,1]，d∈[1,5]；
Preferably, in the step 5), the time t for the blanking plate (20501) to stay under the opening angle of α degrees is obtained according to the formula (4)n：
Wherein e is a system internal coefficient, and e belongs to [0,5 ]; l is the length of the blanking plate (20501).
12. Method for the uniform distribution in a lime shaft kiln according to claim 11, characterized in that in step 1), the maximum allowable carbon residue ratio γ for a single-shaft lime shaft kilnmaxIs 15%, ifMeasuring＞γmaxAnd k isn＞kmaxIf so, the carbon residue detector (4) sends out a prompt signal of incomplete lime combustion;
maximum allowable carbon residue ratio gamma for double-barrel lime shaft kilnmaxIs 5%, ifMeasuring＞γmaxAnd k isn＞kmaxIf so, the carbon residue detector (4) sends out a prompt signal of incomplete lime combustion;
maximum allowable carbon residue ratio gamma for sleeve lime shaft kilnmaxIs 10% if gammaMeasuring＞γmaxAnd k isn＞kmaxAnd if so, the carbon residue detector (4) sends out a prompt signal of incomplete lime combustion.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3849061A (en) * | 1973-07-30 | 1974-11-19 | Round Rock Lime Co | Vertical kiln control |
| ATA141585A (en) * | 1985-05-10 | 1986-09-15 | Voest Alpine Ag | SHAFT OVEN FOR BURNING CARBONATE-CONTAINING MINERAL COMBUSTION |
| CN86106000A (en) * | 1986-08-30 | 1987-05-20 | 四川建筑材料工业学院 | Novel vertical kiln |
| US5479679A (en) * | 1992-12-23 | 1996-01-02 | Trutzschler Gmbh & Co. Kg | Fiber batt feeding apparatus for a fiber processing machine |
| US5989018A (en) * | 1996-07-05 | 1999-11-23 | Ahlstrom Machinery Oy | Lime sludge feed arrangement |
| CN104591556A (en) * | 2015-01-08 | 2015-05-06 | 建德市云峰碳酸钙有限公司 | Full automatic control lime shaft kiln production line |
| CN105036574A (en) * | 2015-08-07 | 2015-11-11 | 黄石市蓝天环保节能设备有限公司 | Energy-saving environment-friendly lime shaft kiln |
| CN211770961U (en) * | 2020-01-03 | 2020-10-27 | 中冶长天国际工程有限责任公司 | Key type lime shaft kiln material distribution system |
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2020
- 2020-01-03 CN CN202010007127.1A patent/CN111039581B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3849061A (en) * | 1973-07-30 | 1974-11-19 | Round Rock Lime Co | Vertical kiln control |
| ATA141585A (en) * | 1985-05-10 | 1986-09-15 | Voest Alpine Ag | SHAFT OVEN FOR BURNING CARBONATE-CONTAINING MINERAL COMBUSTION |
| CN86106000A (en) * | 1986-08-30 | 1987-05-20 | 四川建筑材料工业学院 | Novel vertical kiln |
| US5479679A (en) * | 1992-12-23 | 1996-01-02 | Trutzschler Gmbh & Co. Kg | Fiber batt feeding apparatus for a fiber processing machine |
| US5989018A (en) * | 1996-07-05 | 1999-11-23 | Ahlstrom Machinery Oy | Lime sludge feed arrangement |
| CN104591556A (en) * | 2015-01-08 | 2015-05-06 | 建德市云峰碳酸钙有限公司 | Full automatic control lime shaft kiln production line |
| CN105036574A (en) * | 2015-08-07 | 2015-11-11 | 黄石市蓝天环保节能设备有限公司 | Energy-saving environment-friendly lime shaft kiln |
| CN211770961U (en) * | 2020-01-03 | 2020-10-27 | 中冶长天国际工程有限责任公司 | Key type lime shaft kiln material distribution system |
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