CN105506270B - A kind of method for reducing injecting coal quantity, improving pellet yield and quality - Google Patents

A kind of method for reducing injecting coal quantity, improving pellet yield and quality Download PDF

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CN105506270B
CN105506270B CN201510981112.4A CN201510981112A CN105506270B CN 105506270 B CN105506270 B CN 105506270B CN 201510981112 A CN201510981112 A CN 201510981112A CN 105506270 B CN105506270 B CN 105506270B
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kiln
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speed
compression strength
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CN105506270A (en
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王子鸣
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Bengang Steel Plates Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/216—Sintering; Agglomerating in rotary furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/26—Cooling of roasted, sintered, or agglomerated ores

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Abstract

A kind of method for reducing injecting coal quantity, improving pellet yield and quality of the present invention, including：Reduce ring formation speed：Temperature of kiln head is controlled to control ring formation speed；Improve rotary kiln and take off block efficiency：Foundation effectively takes off block system and Ba Kuai troops, makes full use of the rake of hard, thick tooth；Reduce injecting coal quantity, control temperature of kiln head：Rotary kiln coal powder injection amount is controlled according to each section of temperature of grate, temperature of kiln head, kiln end temperature and thickness of feed layer, establishes temperature of kiln head inspective rule；Ensure yield：Improve green-ball amount and ensure the uniformity of cloth, ensure the matching of machine speed, kiln speed, ring speed and green-ball amount；Ensure that quality includes ensureing raw material and fuel quality, procedure quality and finished ball quality.The present invention was analyzed and taken measures to the reason for apparatus and process defect, maintenance data carries out objectivity, efficiency analysis, solves the contradiction between ring formation of rotary kiln speed, injecting coal quantity, pellet yield, pellet quality and impurity relative compressive strength, the influence of ring formation.

Description

A kind of method for reducing injecting coal quantity, improving pellet yield and quality
Technical field
It is specifically a kind of to reduce injecting coal quantity, improve pellet yield the present invention relates to a kind of pelletizing ore production technology With the method for quality.
Background technology
At present, grate-rotary kiln-ring cold machine production model is by grate, rotary kiln, ring cold machine production oxidation Three big host modes of pellet.Due to during pelletizing production, reducing ring formation of rotary kiln speed, reducing injecting coal quantity, raising Pellet yield, raising pellet quality influence each other, and ring formation of rotary kiln speed is fast, it is big to take off block amount, pellet yield is general, anti- Compressive Strength only reaches 2000N/ balls.Temperature of kiln head (1180 DEG C of ＜) is controlled, to control ring formation speed；Post per tour morning and afternoon will Check kiln inner process, the thickness of ring formation, coal rifle flame conditions.The block that claws is carried out the analysis of causes (whether burning zone temperature mistake High, quality of pc is bad, coal dust sinks Relatively centralized, enter that kiln pelletizing powder is more, objectionable impurities R2O and SO3Too high levels)
Due to during pelletizing production, reducing ring formation of rotary kiln speed, reduction injecting coal quantity, improve pellet yield, carry High pellet quality influences each other, and in order to synchronously realize steady matter high yield, energy-saving, thus works out a kind of new method gesture must OK.
The content of the invention
For pellet in the prior art production there are ring formation of rotary kiln speed it is fast, take off block amount is big, pellet yield not High shortcoming, reduces injecting coal quantity the technical problem to be solved in the present invention is to provide one kind, improves pellet yield and quality Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of method for reducing injecting coal quantity, improving pellet yield and quality of the present invention, including：
Reduce ring formation speed：Temperature of kiln head is controlled to hold hilllock personnel inspection kiln inner process, the thickness of ring formation to control ring formation speed Degree and coal rifle flame conditions, the analysis of causes is carried out to the block clawed；
Improve rotary kiln and take off block efficiency：Foundation effectively takes off block system and Ba Kuai troops, makes full use of the rake of hard, thick tooth Son；
Reduce injecting coal quantity, control temperature of kiln head：According to each section of temperature of grate, temperature of kiln head, kiln end temperature and the bed of material Thickness control rotary kiln coal powder injection amount, establishes temperature of kiln head inspective rule；
Ensure yield：Improve green-ball amount and ensure the uniformity of cloth, ensure the stability and abundance of ore dressing miberal powder supplied materials Property, and the miberal powder amount of storage in ore deposit groove is at least reached one day and used, and ensures the matching of machine speed, kiln speed, ring speed and green-ball amount；
Ensure that quality includes ensureing raw material and fuel quality, procedure quality and finished ball quality：Crude fuel meets target component, root Pelletizing is carried out according to material properties, ensures quality of green pellets；
Preheating section and temperature of kiln head control are improved, monitors corresponding operating parameter.
Carrying out the analysis of causes to the block clawed includes：Phase that whether burning zone temperature is excessive, quality of pc is bad, coal dust sinks To concentrating, entering more than kiln pelletizing powder and objectionable impurities R2O and SO3Too high levels.
It is that iron ore concentrate granularity brought up to more than 86%~87% to ensure raw material and fuel quality, specific surface area brings up to 1600~ 1800cm2/ g, wet concentrate moisture are less than 9.5%；Bentonite selects the compound bentonite of sodium base, smectite content >=64%, granularity >=90%, moisture ＜ 15%；Rotary kiln burning should use production coal, calorific value >=29MJ/kg, volatile matter 14%~18%, ash content ＜ 12%, 1400 DEG C of ash fusion point ＞, sulfur content ＜ 1%, moisture ＜ 10%, 0~80mm of granularity；Ensure the He of coal powder size >=80% Coal dust moisture ＜ 1%.
Ensure that procedure quality is：Rationally control mixture moisture, bentonite ore ratio, pelletizing rotating speed, dry concentrate proportioning, dropwise addition Water, according to miberal powder and actual quality of green pellets, Proper Match grate, rotary kiln, the thermal technology parameter of ring cold machine.
Ensure finished ball quality, that is, ensure the compression strength of finished ball, it is every 1 it is small when detect compression strength, while it is every 2 it is small when The density of finished pellet, granularity, burst conditions are detected, to judge whether to need to adjust corresponding operating parameter, including dispensing, Pelletizing, thermal technology, coal processed and fan parameter.
Present invention additionally comprises solve powdered ore quality and the contradiction of finished ball nodulizing compression strength：I.e. by powder particle size (- 200 Mesh) bring up to more than 86%~87%；- 325 mesh >=55%；
If 10~12.5mm pellets compression strength >=2000N/ balls are improved, it is necessary to demonstrate,prove supplied materials powdered ore quality stabilization, automatically Change accurate dispensing, automate accurate pelletizing, estimate the three big optimal thermal operating parameter areas of host：1) fuzzy statistics pressure resistance Corresponding thermal operating parameter during degree >=2100N/ balls, the optimum range of parameter is estimated according to the central tendency of data；2) try Each section of grate of room simulation is tested, in the case of miberal powder, bentonite and pelletizing parameter stability, counts and simulates pre- hot-bulb resistance to compression Intensity grows up to curve, in the hope of optimum drying preheating temperature；And precisely controlled into trip temperature by the butterfly valve of each section of bellows of grate System, and the device for preventing that butterfly valve from blocking is installed.
If improving 10~12.5mm pellets compression strength >=2000N/ balls, grate design length need to be improved；Appropriate drop Low grate thickness of feed layer.
If improving 10~12.5mm pellets compression strength >=2000N/ balls, compression strength is improved using increase liquid phase, Injecting coal quantity is improved, temperature of kiln head control is improved, injecting coal quantity is reduced again after compression strength improves.
, need to be heat-resisting to the dry section windbox modifications of drum, use if improving 10~12.5mm pellets compression strength >=2000N/ balls Impeller and high temperature resistant, wear-resistant liner, to improve the dry section box temperature of drum；Coal rifle centre wind valve opening is increased, flame is grown Degree is extended in kiln, to improve II section of temperature of kiln end temperature and preheating；
If alternatively, improving 10~12.5mm pellets compression strength >=2000N/ balls, it need to suitably amplify pellet grade, will Pellet grade improves 2mm, and 12mm pelletizings can at least improve more than 100N/ balls than 10mm pellets compression strength.
Present invention additionally comprises：
Objectivity, efficiency analysis are carried out with data, is specially：Thermal equilibrium analysis：Material balance and thermal balance, including ball Group's grate material balance pellet grate thermal balance pelletizing rotary kiln thermal balance and pellet circular cooler thermal balance；
Establish the relational expression of machine speed, thickness of feed layer and dry bulb compression strength：50~60 groups of data are collected, utilize Minitab 15 correlation regression analysis, set up the fuzzy relation formula of machine speed, thickness of feed layer and dry bulb compression strength in each section of grate respectively, And calculation error.
Establish the relational expression of coal unit consumption (or injecting coal quantity unit consumption) and unit-hour output：When supplied materials property and quality of green pellets are stablized When, 50~60 groups of data are collected, utilize 15 correlation regression analysis of Minitab, it is established that the fuzzy pass of coal unit consumption and unit-hour output It is formula, and calculation error；
, it is necessary to collect examination in bentonite type selecting, compression strength tackling key problem, basicity tackling key problem, grade tackling key problem, yield tackling key problem experiment The crude fuel of phase and base period, each section of process operations parameter, green-ball index, dry bulb index are tested, and establishes related form；
When supplied materials property and green-ball are stablized, and when each section of temperature control of grate tends towards stability, fluctuation is no more than ± 15 DEG C when, when machine speed is constant, statistics thickness of feed layer, wind speed (box temperature) under grate bed, the data of wind speed and compression strength on the bed of material, 50~60 groups of data are collected, utilize 15 correlation regression analysis of Minitab, it is established that fuzzy relation formula, and calculation error；
In kiln hood and kiln end temperature galvanic couple normal operation, in kiln during infrared thermography normal operation, put according to burning Heat, radiation, convection current, heat transfer, which calculate to simulate in conjunction with kiln skin temperature, calculates each point temperature in kiln discharge, writes temperature field in kiln Numerical simulation software, judges that the ring formation degree of each point in kiln discharge, refractory material come off or scaling loss degree.
The invention has the advantages that and advantage：
1. the method for the present invention reduces ring formation of rotary kiln speed, reduces injecting coal quantity, improve pellet yield, improve pellet Quality, improves rotary kiln and takes off block efficiency, improves green-ball amount (>=420~450t/h) and ensures the uniformity of cloth, ensures choosing The stability and adequate of ore deposit miberal powder supplied materials, and the miberal powder amount of storage in ore deposit groove is at least reached one day and used, and ensure that machine speed, kiln The matching of speed, ring speed and green-ball amount.
2. the method for the present invention was analyzed and taken measures to the reason for pelletizing production defective workmanship：It is cold that pelletizing is transported to from concentrate But the overall process of process；The reason for apparatus and process defect, is analyzed and taken measures, maintenance data carries out objectivity, validity point Analysis, solves the contradiction between ring formation of rotary kiln speed, injecting coal quantity, pellet yield, pellet quality, solves impurities phase pair The influence of compression strength, ring formation
Brief description of the drawings
Fig. 1 is that kiln temperature site sets distribution map in the method for the present invention.
Embodiment
With reference to Figure of description, the present invention is further elaborated.
A kind of method for reducing ring formation of rotary kiln speed, reducing injecting coal quantity, improving pellet yield and quality of the present invention, its It is characterized in that comprising the following steps：
Reduce ring formation speed：Control control temperature of kiln head (1180 DEG C of ＜), to control ring formation speed；Post per tour morning and afternoon is all Check kiln inner process, the thickness of ring formation, coal rifle flame conditions.The analysis of causes is carried out to the block clawed, includes whether clinkering zone Temperature is excessive, quality of pc is bad, coal dust sinks Relatively centralized, enter that kiln pelletizing powder is more, objectionable impurities R2O and SO3Content mistake It is high.
Improve rotary kiln and take off block efficiency：Foundation effectively takes off block system and Ba Kuai troops, makes full use of the rake of hard, thick tooth Son；When largely taking off block, fully block instrument is taken off using combination.Temperature is excessive, and the probability of pelletizing into liquid phase increases, and ring formation is serious, resistance to Material scaling loss is serious, and consumption of coal is big；Temperature is too low, and Yield comparison is low, and compression strength is completed bad.
Reduce injecting coal quantity, control temperature of kiln head：According to each section of temperature of grate, temperature of kiln head, kiln end temperature and the bed of material Thickness control rotary kiln coal powder injection amount, establishes temperature of kiln head inspective rule；
Ensure yield：Improve green-ball amount (>=420~450t/h) and ensure the uniformity of cloth, ensure ore dressing miberal powder supplied materials Stability and adequate, and the miberal powder amount of storage in ore deposit groove at least reaches what is used within one day.Guarantee machine speed, kiln speed, ring speed and life The matching of ball amount.
Ensure that quality includes ensureing raw material and fuel quality, procedure quality and finished ball quality：Crude fuel meets target component, root Pelletizing is carried out according to material properties, ensures quality of green pellets；
Preheating section and temperature of kiln head control are improved, monitors corresponding operating parameter.
Wherein, raw material and fuel quality is ensured：Iron ore concentrate granularity (- 200 mesh) is brought up to more than 86%~87%, compares surface Product brings up to 1600~1800cm2/ g, wet concentrate moisture less than 9.5% (less than 9.8% also can, otherwise to be deposited according to miberal powder groove Amount judges whether out drying machine)；Bentonite preferably selects the compound bentonite of sodium base, smectite content >=64%, granularity (- 325 Mesh) >=90%, moisture ＜ 15%；Rotary kiln burning should use production coal, calorific value >=29MJ/kg, volatile matter 14%~18%, ash Divide ＜ 12%, 1400 DEG C of ash fusion point ＞, sulfur content ＜ 1%, moisture ＜ 10%, 0~80mm of granularity；Ensure coal powder size (- 200 Mesh) >=80% and coal dust moisture ＜ 1%.
Ensure procedure quality：Pelletizing is carried out according to material properties, ensures quality of green pellets.Rationally control mixture moisture, swollen The native proportioning of profit, pelletizing rotating speed, dry concentrate proportioning, be added dropwise water.According to miberal powder and actual quality of green pellets, Proper Match grate, The thermal technology parameter of rotary kiln, ring cold machine.The present embodiment counts 10~12.5mm compression strength >=2100N/ balls, 2150N/ balls Or the thermal operating parameter of 2200N/ balls, data central tendency is checked by scatter diagram, is deleted and made a variation according to process operation parameter Point, in the hope of temperature, material is thick, machine is fast, the optimum range of kiln speed, ring speed.
Ensure finished ball quality (compression strength)：Pelletizing is carried out according to material properties, ensures quality of green pellets, improves preheating section Controlled with temperature of kiln head.It is every 1 it is small when detect compression strength, while it is every 2 it is small when detect the density, granularity, explosion of finished pellet Situation, to judge whether to need to adjust corresponding operating parameter (dispensing, pelletizing, thermal technology, coal processed, wind turbine etc.).
A kind of reduction injecting coal quantity of the present invention, the method for raising pellet yield and quality are further comprising the steps of：
Improve equipment efficiency：Spare part designing quality (design structure, mechanical property) is improved, pays close attention to spare part material Ni, Cr content (can study Japan, Germany, the material of Russian similar product), (close to maintaining strict control over pass into the spare part quality of factory in matter Key member will be examined piece by piece, point by point), the requirement of equipment assembly precision is improved, scrap build is checked and accepted and maintains strict control over pass；Strengthen equipment " three The implementation capacity of position one " particle check system, and combine field management and ensure equipment stable operation rate；Spare part is promptly replaced to live, Master control room and post personal scheduling contact, and chief operator must arrive scene in person, to reduce downtime to the greatest extent；Research Japan profit The oil of lubricating oil, life cycle maintenance and management is carried out to equipment.
Handle emergency episode (have a power failure, cut off the water, three big host accidents, wind turbine accident)：Emergency episode emergency preplan is established, and Include《Emergency episode operational procedure》, operate stringent post of carrying out and contact confirmation system, and require each teams and groups' strict implement；Each key Post will keep post phone, mobile phone unimpeded.
The method of the present invention maintenance data carries out objectivity, efficiency analysis, specifically includes：
Solve powdered ore quality and the contradiction of finished ball nodulizing compression strength
(1) make great efforts powder particle size (- 200 mesh) bringing up to more than 86%~87%；- 325 mesh >=55%.But granularity reaches More than 90%, it is necessary to consume very high ore grinding cost and the typically no so high smelting requirements of blast furnace；If granularity is meticulous, cause Gap shrinks between pelletizing particle, with reference to closer；But the combination power between material particles reduces on the contrary, green-ball drying, It is also easier to produce explosion during preheating, pelletizing pulverization rate is serious.
(2) powder particle size (- 200 mesh), if powder particle size is less than 84%, will combine not close up to 80% between particle.If improve 10~12.5mm pellets compression strength >=2000N/ balls, method one：Need to ensure that supplied materials powdered ore quality is stablized, automation is accurate Dispensing, automates accurate pelletizing (referring to Shoudu Iron and Steel Co pelletizing), estimates the three big optimal thermal operating parameter areas of host：1. obscure Corresponding thermal operating parameter when counting compression strength >=2100N/ balls, the optimal of parameter is estimated according to the central tendency of data Scope；2. each section of laboratory simulation grate, in the case of miberal powder, bentonite and pelletizing parameter stability, counts and simulates Pre- hot-bulb compression strength grows up to curve, in the hope of optimum drying preheating temperature；And carried out by the butterfly valve of each section of bellows of grate Temperature is precisely controlled, and installs the device for preventing that butterfly valve from blocking；Method two：Improve grate design length；It is appropriate to reduce chain grate Machine thickness of feed layer (by controlling green-ball amount, machine speed)；Method three：Since solid phase improves, compression strength is limited, and can use increases liquid Mutually improve compression strength (improving injecting coal quantity, improve temperature of kiln head control), appropriate reduce is sprayed again after compression strength improves Coal amount；Method four：To the dry section windbox modifications of drum, using heat-resisting impeller and high temperature resistant, wear-resistant liner, to improve the dry section bellows temperature of drum Degree；Coal rifle centre wind valve opening is increased, the length of flame is extended in kiln, to improve II section of temperature of kiln end temperature and preheating Degree；Method five：Appropriate amplification pellet grade, pellet grade being improved 2mm, (12mm pelletizings are than 10mm pellet pressure resistances Degree can at least improve more than 100N/ balls).
(3) powder particle size (- 200 mesh) is less than 80%, then compression strength do not reach the quality responsibilities of 2000N/ balls will be by miberal powder Unit is provided to undertake.To select factory to be linked up with concentrate immediately at this time, and carry out powdered ore quality crash analysis and examination.
Solve the influence of impurity relative compressive strength, ring formation
Facilitate bloodstone mutually to be generated with the ore deposit of magnetic iron ore, reduce the generation of other ore deposit phases, it is necessary to improve rotary kiln ventilation quantity, To improve kiln internal oxidition atmosphere, improve into kiln preheated pellets temperature up to 1000 DEG C~1050 DEG C (while reducing coal unit consumption).When So, pellet compression strength is improved, it is necessary to thermal operating standard parameter operation inspection be carried out, by strengthening thermodynamic temperature control Make to improve the bond strength of brilliant key, to improve compactness inside pellet.
The reason for pelletizing production defective workmanship, is analyzed and taken measures：The full mistake of pelletizing refrigerating work procedure is transported to from concentrate Journey；The reason for apparatus and process defect, is analyzed and taken measures.
Abundant maintenance data carries out objectivity, efficiency analysis
(1) thermal equilibrium analysis (material balance and thermal balance, i.e. QEnter=QGo out, GEnter=GGo out)
Pellet grate material balance：
1 grate material income equality of table
2 grate material of table expenditure balance
Pellet grate thermal balance：
The hot income equality of 3 grate of table
4 grate of table heat expenditure balance
Pelletizing rotary kiln thermal balance：
5 rotary kiln heat balance table of table
Pellet circular cooler thermal balance：
6 ring cold machine heat balance table of table
(2) the relational expression of machine speed, thickness of feed layer and dry bulb compression strength is established
Collect 50~60 groups of data, using 15 correlation regression analysis of Minitab, respectively in grate each section set up machine The fuzzy relation formula of speed, thickness of feed layer and dry bulb compression strength, and calculation error.
7 machine of table speed, thickness of feed layer and dry bulb compression strength statistical form
(3) the relational expression of coal unit consumption (or injecting coal quantity unit consumption) and unit-hour output is established
When supplied materials property and quality of green pellets are stablized, 50~60 groups of data are collected, utilize Minitab 15 correlation regressions point Analysis, it is established that the fuzzy relation formula of coal unit consumption and unit-hour output, and calculation error.
8 coal unit consumption of table (or injecting coal quantity unit consumption) and unit-hour output statistical form
(4), it is necessary to collect in bentonite type selecting, compression strength tackling key problem, basicity tackling key problem, grade tackling key problem, yield tackling key problem experiment Experimental period and the crude fuel of base period, each section of process operations parameter, green-ball index, dry bulb index, and establish related form.
(5) when supplied materials property and green-ball are stablized, and when each section of temperature control of grate tends towards stability, fluctuation is no more than ± At 15 DEG C, when machine speed is constant, wind speed (box temperature) under thickness of feed layer, grate bed, wind speed and the number of compression strength on the bed of material are counted According to 50~60 groups of data of collection, utilize 15 correlation regression analysis of Minitab, it is established that fuzzy relation formula, and calculation error.
Wind speed under 9 thickness of feed layer of table, grate bed, wind speed and compression strength statistical form on the bed of material
Note：Wherein, temperature can combine into the bed permeability at grate, wind speed etc. and be compared meter on certain point bed of material Draw.
(6) in kiln hood and kiln end temperature galvanic couple normal operation, in kiln during infrared thermography normal operation, according to burning Heat release, radiation, convection current, heat transfer, which calculate to simulate in conjunction with kiln skin temperature, calculates each point temperature in kiln discharge, writes temperature in kiln Numerical Simulation software, thus may determine that the ring formation degree of each point in kiln discharge, refractory material come off or scaling loss degree.
As shown in Figure 1, kiln hood to kiln tail is divided into 1#~17# totally 17 points surely, cross-sectional direction be divided into A, B, C, D, E, F, G, H totally 8 indexing, pass through known conditions, calculating and simulation softward, you can obtain surface each point temperature in kiln.
The kiln temperature field statistical form of table 10* indexing

Claims (4)

  1. A kind of 1. method for reducing injecting coal quantity, improving pellet yield and quality, it is characterised in that including：
    Reduce ring formation speed：Control temperature of kiln head to control ring formation speed, hold hilllock personnel inspection kiln inner process, ring formation thickness with And coal rifle flame conditions, the analysis of causes is carried out to the block clawed；
    Improve rotary kiln and take off block efficiency：Foundation effectively takes off block system and Ba Kuai troops, makes full use of the rake of hard, thick tooth；
    Reduce injecting coal quantity, control temperature of kiln head：According to each section of temperature of grate, temperature of kiln head, kiln end temperature and thickness of feed layer Rotary kiln coal powder injection amount is controlled, establishes temperature of kiln head inspective rule；
    Ensure yield：Improve green-ball amount and ensure the uniformity of cloth, ensure the stability and adequate of ore dressing miberal powder supplied materials, and Miberal powder amount of storage in ore deposit groove, which at least reaches one day, to be used, and ensures the matching of machine speed, kiln speed, ring speed and green-ball amount；
    Ensure that quality includes ensureing raw material and fuel quality, procedure quality and finished ball quality：Crude fuel meets target component, according to thing Expect that property carries out pelletizing, ensure quality of green pellets；
    Preheating section and temperature of kiln head control are improved, monitors corresponding operating parameter；
    Objectivity, efficiency analysis are carried out with data, is specially：
    Thermal equilibrium analysis：Material balance and thermal balance, including pellet grate material balance pellet grate thermal balance pelletizing Rotary kiln thermal balance and pellet circular cooler thermal balance；
    Establish the relational expression of machine speed, thickness of feed layer and dry bulb compression strength：50~60 groups of data are collected, utilize 15 phases of Minitab Regression analysis is closed, sets up the fuzzy relation formula of machine speed, thickness of feed layer and dry bulb compression strength in each section of grate respectively, and count Calculate error；
    Establish coal unit consumption or injecting coal quantity unit consumption and the relational expression of unit-hour output：When supplied materials property and quality of green pellets are stablized, collect 50~60 groups of data, utilize 15 correlation regression analysis of Minitab, it is established that the fuzzy relation formula of coal unit consumption and unit-hour output, and Calculation error；
    , it is necessary to collect experimental period in bentonite type selecting, compression strength tackling key problem, basicity tackling key problem, grade tackling key problem, yield tackling key problem experiment Crude fuel, each section of process operations parameter with base period, green-ball index, dry bulb index, and establish related form；
    When supplied materials property and green-ball are stablized, and when each section of temperature control of grate tends towards stability, when fluctuation is no more than ± 15 DEG C, When machine speed is constant, wind speed under thickness of feed layer, grate bed, the data of wind speed and compression strength on the bed of material are counted, collect 50~60 groups of numbers According to utilizing 15 correlation regression analysis of Minitab, it is established that fuzzy relation formula, and calculation error；
    In kiln hood and kiln end temperature galvanic couple normal operation, in kiln during infrared thermography normal operation, according to combustion heat release, spoke Penetrate, convection current, heat transfer calculate in conjunction with kiln skin temperature simulate calculate kiln discharge in each point temperature, write Numerical Temperature mould in kiln Intend software, judge that the ring formation degree of each point in kiln discharge, refractory material come off or scaling loss degree；
    Further include and solve powdered ore quality and the contradiction of finished ball nodulizing compression strength：The mesh of powder particle size -200 is brought up to 86% More than~87%；- 325 mesh >=55%；
    If improving 10~12.5mm pellets compression strength >=2000N/ balls, it is realized by the following method：
    Estimate the three big optimal thermal operating parameter areas of host：1) corresponding heat during fuzzy statistics compression strength >=2100N/ balls Work operating parameter, the optimum range of parameter is estimated according to the central tendency of data；2) each section of laboratory simulation grate, in ore deposit In the case of powder, bentonite and pelletizing parameter stability, what is counted and simulate pre- hot-bulb compression strength grows up to curve, in the hope of optimal Drying and preheating temperature；And be precisely controlled by the butterfly valve of each section of bellows of grate into trip temperature, and installation prevents what butterfly valve from blocking Device；
    Improve grate design length；By controlling the low grate thickness of feed layer of green-ball amount, machine prompt drop；
    Consider that solid phase raising compression strength is limited, compression strength is improved using increase liquid phase, that is, improves injecting coal quantity, improves kiln hood Temperature control, suitably reduces injecting coal quantity again after compression strength improves；
    To the dry section windbox modifications of drum, using heat-resisting impeller and high temperature resistant, wear-resistant liner, to improve the dry section box temperature of drum；By coal Rifle centre wind valve opening increases, and the length of flame is extended in kiln, to improve II section of temperature of kiln end temperature and preheating；
    Amplify pellet grade, pellet grade is improved into 2mm.
  2. 2. reduce injecting coal quantity, the method for improving pellet yield and quality as described in claim 1, it is characterised in that：To taking off The block gone out, which carries out the analysis of causes, to be included：Whether burning zone temperature is excessive, quality of pc is bad, coal dust sinks Relatively centralized, enter kiln Pelletizing powder is more and objectionable impurities R2O and SO3Too high levels.
  3. 3. reduce injecting coal quantity, the method for improving pellet yield and quality as described in claim 1, it is characterised in that：Ensure Procedure quality is：Rationally control mixture moisture, bentonite ore ratio, pelletizing rotating speed, dry concentrate proportioning, dropwise addition water, according to ore deposit Powder and actual quality of green pellets, Proper Match grate, rotary kiln, the thermal technology parameter of ring cold machine.
  4. 4. reduce injecting coal quantity, the method for improving pellet yield and quality as described in claim 1, it is characterised in that：Ensure Finished ball quality, that is, ensure the compression strength of finished ball, it is every 1 it is small when detect compression strength, while it is every 2 it is small when detect finished pellet Density, granularity, burst conditions, to judge whether to need to adjust corresponding operating parameter, including dispensing, pelletizing, thermal technology, system Coal and fan parameter.
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