CN105506270A - Method for lowering coal powder injection amount and improving yield and quality of pellets - Google Patents
Method for lowering coal powder injection amount and improving yield and quality of pellets Download PDFInfo
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- CN105506270A CN105506270A CN201510981112.4A CN201510981112A CN105506270A CN 105506270 A CN105506270 A CN 105506270A CN 201510981112 A CN201510981112 A CN 201510981112A CN 105506270 A CN105506270 A CN 105506270A
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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
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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
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
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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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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Abstract
The invention provides a method for lowering the coal powder injection amount and improving the yield and quality of pellets. The method comprises the steps of lowering the ring formation speed; controlling the temperature of a kiln head for controlling the ring formation speed; improving the raking speed of a rotary kiln, wherein an efficient raking system and a raking team are established and hard and thick-tooth rakes are made full use of; lowering the coal powder injection amount and controlling the temperature of the kiln head, wherein the coal powder injection amount of the rotary kiln is controlled according to the temperature of each section of a chain grate, the temperature of the kiln head, the temperature of a kiln tail and the thickness of a material layer and an inspection system is established for the temperature of the kiln head; guaranteeing the yield, wherein the pellet generation capacity is improved, the distribution uniformity is guaranteed, and matching among the machine speed, the kiln speed, the ring speed and the pellet generation capacity is guaranteed; guaranteeing the quality comprising the crude fuel quality, the process quality and the quality of finished pellets. According to the invention, the reasons of equipment and process defects are analyzed, measures are taken, objective and effective analysis is made through data, the contradiction among the ring formation speed of the rotary kiln, the coal powder injection amount, the pellet yield and the pellet quality is solved, and the influence of impurities to the compressive strength and ring formation is avoided.
Description
Technical field
The present invention relates to a kind of pellet production technique, specifically a kind of method reducing injecting coal quantity, improve pellet seed output and quality.
Background technology
At present, chain grate machine-rotary kiln-central cooler production model is the three large host modes by chain grate machine, rotary kiln, central cooler production oxide pellet.Due in pellet formation process, reduce ring formation of rotary kiln speed, reduce injecting coal quantity, improve pellet output, improve pellet quality and influence each other, ring formation of rotary kiln speed is fast, take off that block amount is large, pellet output is general, ultimate compression strength only reaches 2000N/ ball.Control temperature of kiln head (< 1180 DEG C), to control ring formation speed; Post per tour all will check thickness, the coal rifle flame conditions of kiln inner process, ring formation morning and afternoon.(burning zone temperature is too high, quality of pc is bad, coal dust sinks Relatively centralized, enter that kiln pelletizing powder is many, detrimental impurity R to carry out the analysis of causes to the block clawed
2o and SO
3too high levels)
Due in pellet formation process, reduce ring formation of rotary kiln speed, reduction injecting coal quantity, improve pellet output, raising pellet quality influences each other, in order to synchronously realize steady matter high yield, save energy and reduce the cost, thus work out a kind of novel method imperative.
Summary of the invention
For the production of pellet in prior art exist ring formation of rotary kiln speed fast, take off that block amount is large, the not high weak point of pellet output, the technical problem to be solved in the present invention is to provide a kind of method reducing injecting coal quantity, improve pellet seed output and quality.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of method reducing injecting coal quantity, improve pellet seed output and quality of the present invention, comprising:
Reduce ring formation speed: control temperature of kiln head to control ring formation speed, hold hilllock personnel inspection kiln inner process, the thickness of ring formation and coal rifle flame conditions, the analysis of causes is carried out to the block clawed;
Improve rotary kiln and take off block efficiency: set up and effectively take off block system and Ba Kuai troop, make full use of the rake of hard, thick tooth;
Reduce injecting coal quantity, control temperature of kiln head: control rotary kiln coal powder injection amount according to chain grate machine each section of temperature, temperature of kiln head, kiln end temperature and bed thickness, set up temperature of kiln head inspective rule;
Ensure output: the homogeneity improving green-ball amount and guarantee cloth, ensure stability and the abundance of ore dressing breeze supplied materials, and the breeze store content in the groove of ore deposit at least enough uses for one day, ensure that machine speed, kiln are fast, ring is fast and the coupling of green-ball amount;
Ensure the quality of products to comprise and ensure raw material and fuel quality, procedure quality and finished ball quality: crude fuel meets target component, carries out pelletizing according to material properties, ensure quality of green pellets;
Improve preheating section and temperature of kiln head control, monitor corresponding operating parameters.
Carry out the analysis of causes to the block clawed to comprise: burning zone temperature is too high, quality of pc is bad, coal dust sinks Relatively centralized, enter kiln pelletizing powder mainly with and detrimental impurity R
2o and SO
3too high levels.
Ensure that raw material and fuel quality is that iron ore concentrate granularity is brought up to more than 86% ~ 87%, specific surface area brings up to 1600 ~ 1800cm
2/ g, wet concentrate moisture is lower than 9.5%; Wilkinite selects the compound wilkinite of sodium base, smectite content>=64%, granularity>=90%, moisture < 15%; Rotary kiln burning should with producing coal, calorific value>=29MJ/kg, volatile matter 14% ~ 18%, ash content < 12%, ash fusion point > 1400 DEG C, sulphur content < 1%, moisture < 10%, granularity 0 ~ 80mm; Ensure coal powder size>=80% and coal dust moisture < 1%.
Guarantee procedure quality is: conservative control mixture moisture, bentonite ore ratio, pelletizing rotating speed, dry concentrate proportioning, the dropping water yield, according to breeze and actual quality of green pellets, and the thermal technology parameter of rational Match chain grate machine, rotary kiln, central cooler.
Ensure finished ball quality, namely ensure the ultimate compression strength of finished ball, within every 1 hour, detect ultimate compression strength, within every 2 hours simultaneously, detect density, granularity, the burst conditions of finished pellet, to judge whether to need to adjust corresponding operating parameters, comprise batching, pelletizing, thermal technology, coal processed and fan parameter.
The present invention also comprises the contradiction solving powdered ore quality and finished ball nodulizing ultimate compression strength: bring up to more than 86% ~ 87% by powder particle size (-200 order);-325 order >=55%;
If improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, card supplied materials powdered ore quality is needed to stablize, automatization is precisely prepared burden, the accurate pelletizing of automatization, estimate the best thermal technology's range of operating parameters of three large main frames: thermal operating parameter corresponding during 1) fuzzy statistics ultimate compression strength >=2100N/ ball, estimates the optimum range of parameter according to the central tendency of data; 2) each section of laboratory simulation chain grate machine, when breeze, wilkinite and pelletizing parameter stability, add up and simulate pre-hot-bulb ultimate compression strength grow up to curve, in the hope of optimum drying preheating temperature; And carry out temperature by the butterfly valve of chain grate machine each section of bellows and precisely control, and the device preventing butterfly valve from blocking is installed.
If improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, chain grate machine design length need be improved; Suitable reduction chain grate machine bed thickness.
If improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, adopt increase liquid phase to improve ultimate compression strength, namely improve injecting coal quantity, improve temperature of kiln head and control, after ultimate compression strength improves, reduce injecting coal quantity again.
If improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, to the dry section windbox modifications of drum, heat-resisting impeller and high temperature resistant, abrasion-proof backing block need be adopted, to improve the dry section box temperature of drum; Coal rifle centre wind valve opening is strengthened, the length of flame is extended in kiln, to improve kiln end temperature and preheating II section of temperature;
Or, if improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, need suitably to amplify pellet grade, pellet grade improved 2mm, 12mm pelletizing and at least can improve more than 100N/ ball than 10mm pellet ultimate compression strength.
The present invention also comprises:
Carry out objectivity, efficiency analysis by data, be specially: thermal equilibrium analysis: material balance and thermal equilibrium, comprise pellet grate material balance pellet grate thermal equilibrium applied to pelletizing rotary kiln thermal equilibrium and pellet circular cooler thermal equilibrium;
Set up the relational expression of machine speed, bed thickness and dry bulb ultimate compression strength: collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, the fuzzy relation formula of machine speed, bed thickness and dry bulb ultimate compression strength is set up respectively in each section of chain grate machine, and miscalculation.
Set up the relational expression of coal unit consumption (or injecting coal quantity unit consumption) and unit-hour output: when supplied materials character and quality of green pellets are stablized, collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up the fuzzy relation formula of coal unit consumption and unit-hour output, and miscalculation;
In wilkinite type selecting, ultimate compression strength tackling key problem, basicity tackling key problem, grade tackling key problem, output tackling key problem test, need to collect trial period and the crude fuel of base period, each section of process operations parameter, green-ball index, dry bulb index, and set up relevant form;
When supplied materials character and green-ball are stablized, and chain grate machine each section of temperature is when controlling to tend towards stability, fluctuation be no more than ± 15 DEG C time, when machine speed is constant, statistics bed thickness, the data of wind speed and ultimate compression strength on wind speed (box temperature), the bed of material under grate bed, collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up fuzzy relation formula, and miscalculation;
When kiln hood and kiln end temperature galvanic couple normal operation, in kiln during infrared thermography normal operation, calculate again in conjunction with each point temperature in kiln skin temperature analog calculation kiln discharge according to combustion heat release, radiation, convection current, thermal conduction, write Simulation on Temperature Field software in kiln, judge the ring formation degree of each point in kiln discharge, refractory materials comes off or scaling loss degree.
The present invention has following beneficial effect and advantage:
1. the inventive method reduces ring formation of rotary kiln speed, reduces injecting coal quantity, improves pellet output, improves pellet quality, improve rotary kiln and take off block efficiency, improve the homogeneity of green-ball amount (>=420 ~ 450t/h) and guarantee cloth, ensure stability and the abundance of ore dressing breeze supplied materials, and the breeze store content in the groove of ore deposit at least enough uses for one day, ensure that machine speed, kiln are fast, ring is fast and the coupling of green-ball amount.
2. the inventive method is taken measures to the analysis of causes of pellet formation defective workmanship: the whole process that is transported to pelletizing refrigerating work procedure from concentrate; The analysis of causes of apparatus and process defect is taken measures, maintenance data carries out objectivity, efficiency analysis, solve the contradiction between ring formation of rotary kiln speed, injecting coal quantity, pellet output, pellet quality, solve the impact of impurity relative compressive strength, ring formation.
Accompanying drawing explanation
Fig. 1 is that in the inventive method, kiln temperature field point arranges distribution plan.
Embodiment
Below in conjunction with Figure of description, the present invention is further elaborated.
A kind of method reducing ring formation of rotary kiln speed, reduce injecting coal quantity, improve pellet seed output and quality of the present invention, is characterized in that comprising the following steps:
Reduce ring formation speed: control controls temperature of kiln head (< 1180 DEG C), to control ring formation speed; Post per tour all will check thickness, the coal rifle flame conditions of kiln inner process, ring formation morning and afternoon.The analysis of causes carried out to the block clawed, comprises whether burning zone temperature is too high, quality of pc is bad, coal dust sinks Relatively centralized, enter that kiln pelletizing powder is many, detrimental impurity R
2o and SO
3too high levels.
Improve rotary kiln and take off block efficiency: set up and effectively take off block system and Ba Kuai troop, make full use of the rake of hard, thick tooth; When taking off block in a large number, combination is fully used to take off block instrument.Temperature is too high, and pelletizing becomes the probability of liquid phase to strengthen, and ring formation is serious, and resistance to material scaling loss is serious, and consumption of coal is large; Temperature is too low, and Yield compari@is low, and ultimate compression strength completes bad.
Reduce injecting coal quantity, control temperature of kiln head: control rotary kiln coal powder injection amount according to chain grate machine each section of temperature, temperature of kiln head, kiln end temperature and bed thickness, set up temperature of kiln head inspective rule;
Guarantee output: the homogeneity improving green-ball amount (>=420 ~ 450t/h) and guarantee cloth, ensures stability and the abundance of ore dressing breeze supplied materials, and the breeze store content in the groove of ore deposit at least reaches use in a day.Ensure that machine speed, kiln are fast, ring is fast and the coupling of green-ball amount.
Ensure the quality of products to comprise and ensure raw material and fuel quality, procedure quality and finished ball quality: crude fuel meets target component, carries out pelletizing according to material properties, ensure quality of green pellets;
Improve preheating section and temperature of kiln head control, monitor corresponding operating parameters.
Wherein, raw material and fuel quality is ensured: iron ore concentrate granularity (-200 order) be brought up to more than 86% ~ 87%, specific surface area brings up to 1600 ~ 1800cm
2/ g, wet concentrate moisture lower than 9.5% (lower than 9.8% also can, otherwise drying machine to be judged whether open according to breeze groove storage); Wilkinite preferably selects the compound wilkinite of sodium base, smectite content>=64%, granularity (-325 order)>=90%, moisture < 15%; Rotary kiln burning should with producing coal, calorific value>=29MJ/kg, volatile matter 14% ~ 18%, ash content < 12%, ash fusion point > 1400 DEG C, sulphur content < 1%, moisture < 10%, granularity 0 ~ 80mm; Ensure coal powder size (-200 order)>=80% and coal dust moisture < 1%.
Ensure procedure quality: carry out pelletizing according to material properties, ensure quality of green pellets.Conservative control mixture moisture, bentonite ore ratio, pelletizing rotating speed, dry concentrate proportioning, the dropping water yield.According to breeze and actual quality of green pellets, the thermal technology parameter of rational Match chain grate machine, rotary kiln, central cooler.The thermal operating parameter of the present embodiment statistics 10 ~ 12.5mm ultimate compression strength >=2100N/ ball, 2150N/ ball or 2200N/ ball, data centralization trend is checked by scatter diagram, delete change point according to process operation parameter, in the hope of temperature, expect thick, that machine speed, kiln speed, ring are fast optimum range.
Ensure finished ball quality (ultimate compression strength): carry out pelletizing according to material properties, ensure quality of green pellets, improve preheating section and temperature of kiln head control.Within every 1 hour, detect ultimate compression strength, within every 2 hours simultaneously, detect density, granularity, the burst conditions of finished pellet, to judge whether to need to adjust corresponding operating parameters (batching, pelletizing, thermal technology, coal processed, blower fan etc.).
The present invention is a kind of reduces injecting coal quantity, it is further comprising the steps of to improve the method for pellet seed output and quality:
Raising equipment efficiency: improve spare part designing quality (project organization, mechanical property), pay close attention to Ni, Cr content in material quality of spare parts (material of Japan, Germany, Russian like product can be studied), to the spare part quality entering factory maintain strict control over pass (key part will piece by piece, pointwise inspection), the requirement of raising equipment assembly precision, checks and accepts scrap build and maintains strict control over pass; The implementation capacity of reinforcement equipment " trinity " particle check system, and ensure equipment steady running rate in conjunction with field management; Promptly change spare part to scene, master control room and post personal scheduling contact, and chief operator must arrive scene in person, to try one's best the power generating ratio time; Study the oil of Japanese lubricating oil, life cycle maintenance and management is carried out to equipment.
Process emergency episode (have a power failure, cut off the water, three large main frame accidents, blower fan accident): set up emergency episode emergency preplan, and include in " emergency episode working specification ", operation is strict to be carried out post contact and confirms to make, and requires each teams and groups strict implement; Each key post will keep post phone, mobile phone unimpeded.
The inventive method maintenance data carries out objectivity, efficiency analysis, specifically comprises:
Solve the contradiction of powdered ore quality and finished ball nodulizing ultimate compression strength
(1) make great efforts powder particle size (-200 order) to bring up to more than 86% ~ 87%;-325 order >=55%.But granularity reaches more than 90%, needs consume very high ore grinding cost and blast furnace does not generally have so high smelting requirements; If granularity is meticulous, cause gap shrinks between pelletizing particle, in conjunction with tightr; But the bonding force between material particles reduces on the contrary, green-ball also more easily produces explosion in the process of drying, preheating, and pelletizing Pulverization ratio is serious.
(2) powder particle size (-200 order) will reach 80%, if powder particle size is lower than 84%, combines not tight between particle.If improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, method one: need to ensure that supplied materials powdered ore quality is stablized, automatization is precisely prepared burden, the accurate pelletizing of automatization (can with reference to Shoudu Iron and Steel Co pelletizing), estimate the best thermal technology's range of operating parameters of three large main frames: thermal operating parameter corresponding during 1. fuzzy statistics ultimate compression strength >=2100N/ ball, estimates the optimum range of parameter according to the central tendency of data; 2. each section of laboratory simulation chain grate machine, when breeze, wilkinite and pelletizing parameter stability, add up and simulate pre-hot-bulb ultimate compression strength grow up to curve, in the hope of optimum drying preheating temperature; And carry out temperature by the butterfly valve of chain grate machine each section of bellows and precisely control, and the device preventing butterfly valve from blocking is installed; Method two: improve chain grate machine design length; Suitable reduction chain grate machine bed thickness (by controlling green-ball amount, machine speed); Method three: because solid phase raising ultimate compression strength is limited, can adopt and increase liquid phase to improve ultimate compression strength (namely improve injecting coal quantity, improve temperature of kiln head and control), after ultimate compression strength improves, suitably reduce injecting coal quantity again; Method four: to the dry section windbox modifications of drum, adopt heat-resisting impeller and high temperature resistant, abrasion-proof backing block, to improve the dry section box temperature of drum; Coal rifle centre wind valve opening is strengthened, the length of flame is extended in kiln, to improve kiln end temperature and preheating II section of temperature; Method five: suitably amplify pellet grade, can improve 2mm (12mm pelletizing at least can improve more than 100N/ ball than 10mm pellet ultimate compression strength) by pellet grade.
(3) powder particle size (-200 order) is lower than 80%, then the quality responsibility that ultimate compression strength does not reach 2000N/ ball will be provided unit to bear by breeze.Now factory to be selected to link up with concentrate immediately, and carry out powdered ore quality accident analysis and examination.
Solve the impact of impurity relative compressive strength, ring formation
Facilitate rhombohedral iron ore to generate mutually with the ore deposit of magnetite, reduce the generation of other ore deposit phase, need to improve rotary kiln ventilation, to improve kiln internal oxidition atmosphere, improve and reach 1000 DEG C ~ 1050 DEG C (reducing coal unit consumption) into kiln preheated pellets temperature simultaneously.Certainly, improve pellet ultimate compression strength, need to carry out the operation control of thermal operating standard parameter, control by strengthening thermodynamic temperature the bonding strength improving brilliant key, to improve the inner degree of compactness of pellet.
The analysis of causes of pellet formation defective workmanship is taken measures: the whole process being transported to pelletizing refrigerating work procedure from concentrate; The analysis of causes of apparatus and process defect is taken measures.
Abundant maintenance data carries out objectivity, efficiency analysis
(1) thermal equilibrium analysis (material balance and thermal equilibrium, i.e. Q
enter=Q
go out, G
enter=G
go out)
Pellet grate material balance:
Table 1 chain grate machine material income equality
Table 2 chain grate machine material expenditure balance
Pellet grate thermal equilibrium:
The hot income equality of table 3 chain grate machine
Table 4 chain grate machine heat expenditure balance
Applied to pelletizing rotary kiln thermal equilibrium:
Table 5 rotary kiln heat balance table
Pellet circular cooler thermal equilibrium:
Table 6 central cooler heat balance table
(2) set up the relational expression of machine speed, bed thickness and dry bulb ultimate compression strength
Collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up the fuzzy relation formula of machine speed, bed thickness and dry bulb ultimate compression strength respectively in each section of chain grate machine, and miscalculation.
Table 7 machine speed, bed thickness and dry bulb ultimate compression strength cartogram
(3) set up the relational expression of coal unit consumption (or injecting coal quantity unit consumption) and unit-hour output
When supplied materials character and quality of green pellets are stablized, collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up the fuzzy relation formula of coal unit consumption and unit-hour output, and miscalculation.
Table 8 coal unit consumption (or injecting coal quantity unit consumption) and unit-hour output cartogram
(4), in wilkinite type selecting, ultimate compression strength tackling key problem, basicity tackling key problem, grade tackling key problem, output tackling key problem test, need to collect trial period and the crude fuel of base period, each section of process operations parameter, green-ball index, dry bulb index, and set up relevant form.
(5) when supplied materials character and green-ball are stablized, and chain grate machine each section of temperature is when controlling to tend towards stability, fluctuation be no more than ± 15 DEG C time, when machine speed is constant, statistics bed thickness, the data of wind speed and ultimate compression strength on wind speed (box temperature), the bed of material under grate bed, collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up fuzzy relation formula, and miscalculation.
Wind speed and ultimate compression strength cartogram on wind speed, the bed of material under table 9 bed thickness, grate bed
Note: wherein, bed permeability, wind speed etc. that on certain some bed of material, temperature can be incorporated into chain grate machine place compare and calculate.
(6) when kiln hood and kiln end temperature galvanic couple normal operation, in kiln during infrared thermography normal operation, calculate again in conjunction with each point temperature in kiln skin temperature analog calculation kiln discharge according to combustion heat release, radiation, convection current, thermal conduction, write Simulation on Temperature Field software in kiln, so just can judge the ring formation degree of each point in kiln discharge, refractory materials comes off or scaling loss degree.
As shown in Figure 1, kiln hood is divided into 1# ~ 17# totally 17 points surely to kiln tail, is divided into A, B, C, D, E, F, G, H totally 8 calibration in cross-sectional direction, by known conditions, calculating and simulation software, surperficial each point temperature in kiln.
The kiln temperature field cartogram of table 10* calibration
Claims (10)
1. reduce injecting coal quantity, improve a method for pellet seed output and quality, it is characterized in that comprising:
Reduce ring formation speed: control temperature of kiln head to control ring formation speed, hold hilllock personnel inspection kiln inner process, the thickness of ring formation and coal rifle flame conditions, the analysis of causes is carried out to the block clawed;
Improve rotary kiln and take off block efficiency: set up and effectively take off block system and Ba Kuai troop, make full use of the rake of hard, thick tooth;
Reduce injecting coal quantity, control temperature of kiln head: control rotary kiln coal powder injection amount according to chain grate machine each section of temperature, temperature of kiln head, kiln end temperature and bed thickness, set up temperature of kiln head inspective rule;
Ensure output: the homogeneity improving green-ball amount and guarantee cloth, ensure stability and the abundance of ore dressing breeze supplied materials, and the breeze store content in the groove of ore deposit at least enough uses for one day, ensure that machine speed, kiln are fast, ring is fast and the coupling of green-ball amount;
Ensure the quality of products to comprise and ensure raw material and fuel quality, procedure quality and finished ball quality: crude fuel meets target component, carries out pelletizing according to material properties, ensure quality of green pellets;
Improve preheating section and temperature of kiln head control, monitor corresponding operating parameters.
2., by reduction injecting coal quantity according to claim 1, the method improving pellet seed output and quality, it is characterized in that: the analysis of causes is carried out to the block clawed and comprises: burning zone temperature is too high, quality of pc is bad, coal dust sinks Relatively centralized, enter kiln pelletizing powder mainly with and detrimental impurity R
2o and SO
3too high levels.
3., by reduction injecting coal quantity according to claim 1, the method improving pellet seed output and quality, it is characterized in that: ensure that raw material and fuel quality is that iron ore concentrate granularity is brought up to more than 86% ~ 87%, specific surface area brings up to 1600 ~ 1800cm
2/ g, wet concentrate moisture is lower than 9.5%; Wilkinite selects the compound wilkinite of sodium base, smectite content>=64%, granularity>=90%, moisture < 15%; Rotary kiln burning should with producing coal, calorific value>=29MJ/kg, volatile matter 14% ~ 18%, ash content < 12%, ash fusion point > 1400 DEG C, sulphur content < 1%, moisture < 10%, granularity 0 ~ 80mm; Ensure coal powder size>=80% and coal dust moisture < 1%.
4. by reduction injecting coal quantity according to claim 1, the method improving pellet seed output and quality, it is characterized in that: ensure that procedure quality is: conservative control mixture moisture, bentonite ore ratio, pelletizing rotating speed, dry concentrate proportioning, the dropping water yield, according to breeze and actual quality of green pellets, the thermal technology parameter of rational Match chain grate machine, rotary kiln, central cooler.
5. by reduction injecting coal quantity according to claim 1, the method improving pellet seed output and quality, it is characterized in that: ensure finished ball quality, namely the ultimate compression strength of finished ball is ensured, within every 1 hour, detect ultimate compression strength, within every 2 hours simultaneously, detect density, granularity, the burst conditions of finished pellet, to judge whether to need to adjust corresponding operating parameters, comprise batching, pelletizing, thermal technology, coal processed and fan parameter.
6., by reduction injecting coal quantity according to claim 1, the method improving pellet seed output and quality, characterized by further comprising the contradiction solving powdered ore quality and finished ball nodulizing ultimate compression strength: bring up to more than 86% ~ 87% by powder particle size (-200 order);-325 order >=55%;
If improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, card supplied materials powdered ore quality is needed to stablize, automatization is precisely prepared burden, the accurate pelletizing of automatization, estimate the best thermal technology's range of operating parameters of three large main frames: thermal operating parameter corresponding during 1) fuzzy statistics ultimate compression strength >=2100N/ ball, estimates the optimum range of parameter according to the central tendency of data; 2) each section of laboratory simulation chain grate machine, when breeze, wilkinite and pelletizing parameter stability, add up and simulate pre-hot-bulb ultimate compression strength grow up to curve, in the hope of optimum drying preheating temperature; And carry out temperature by the butterfly valve of chain grate machine each section of bellows and precisely control, and the device preventing butterfly valve from blocking is installed.
7., by reduction injecting coal quantity according to claim 6, the method improving pellet seed output and quality, improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball if it is characterized in that, chain grate machine design length need be improved; Suitable reduction chain grate machine bed thickness.
8. by reduction injecting coal quantity according to claim 6, the method improving pellet seed output and quality, 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball is improved if it is characterized in that, increase liquid phase is adopted to improve ultimate compression strength, namely injecting coal quantity is improved, improve temperature of kiln head to control, after ultimate compression strength improves, reduce injecting coal quantity again.
9. by reduction injecting coal quantity according to claim 6, the method improving pellet seed output and quality, 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball is improved if it is characterized in that, need to the dry section windbox modifications of drum, adopt heat-resisting impeller and high temperature resistant, abrasion-proof backing block, to improve the dry section box temperature of drum; Coal rifle centre wind valve opening is strengthened, the length of flame is extended in kiln, to improve kiln end temperature and preheating II section of temperature;
Or, if improve 10 ~ 12.5mm pellet ultimate compression strength >=2000N/ ball, need suitably to amplify pellet grade, pellet grade improved 2mm, 12mm pelletizing and at least can improve more than 100N/ ball than 10mm pellet ultimate compression strength.
10., by reduction injecting coal quantity according to claim 1, the method improving pellet seed output and quality, characterized by further comprising:
Carry out objectivity, efficiency analysis by data, be specially: thermal equilibrium analysis: material balance and thermal equilibrium, comprise pellet grate material balance pellet grate thermal equilibrium applied to pelletizing rotary kiln thermal equilibrium and pellet circular cooler thermal equilibrium;
Set up the relational expression of machine speed, bed thickness and dry bulb ultimate compression strength: collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, the fuzzy relation formula of machine speed, bed thickness and dry bulb ultimate compression strength is set up respectively in each section of chain grate machine, and miscalculation.
Set up the relational expression of coal unit consumption (or injecting coal quantity unit consumption) and unit-hour output: when supplied materials character and quality of green pellets are stablized, collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up the fuzzy relation formula of coal unit consumption and unit-hour output, and miscalculation;
In wilkinite type selecting, ultimate compression strength tackling key problem, basicity tackling key problem, grade tackling key problem, output tackling key problem test, need to collect trial period and the crude fuel of base period, each section of process operations parameter, green-ball index, dry bulb index, and set up relevant form;
When supplied materials character and green-ball are stablized, and chain grate machine each section of temperature is when controlling to tend towards stability, fluctuation be no more than ± 15 DEG C time, when machine speed is constant, statistics bed thickness, the data of wind speed and ultimate compression strength on wind speed (box temperature), the bed of material under grate bed, collect 50 ~ 60 groups of data, utilize Minitab15 correlation regression analysis, set up fuzzy relation formula, and miscalculation;
When kiln hood and kiln end temperature galvanic couple normal operation, in kiln during infrared thermography normal operation, calculate again in conjunction with each point temperature in kiln skin temperature analog calculation kiln discharge according to combustion heat release, radiation, convection current, thermal conduction, write Simulation on Temperature Field software in kiln, judge the ring formation degree of each point in kiln discharge, refractory materials comes off or scaling loss degree.
Priority Applications (1)
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| CN110564949A (en) * | 2019-10-22 | 2019-12-13 | 山西太钢不锈钢股份有限公司 | Method for reducing powder content of alkaline pellet |
| CN113136487A (en) * | 2021-04-07 | 2021-07-20 | 内蒙古金辉稀矿股份有限公司 | Preparation process of bentonite additive based on pellet production |
| CN115236984A (en) * | 2022-07-25 | 2022-10-25 | 北京佰能盈天科技股份有限公司 | Pellet rotary kiln temperature control method and device |
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| CN110564949A (en) * | 2019-10-22 | 2019-12-13 | 山西太钢不锈钢股份有限公司 | Method for reducing powder content of alkaline pellet |
| CN110564949B (en) * | 2019-10-22 | 2021-02-19 | 山西太钢不锈钢股份有限公司 | Method for reducing powder content of alkaline pellet |
| CN113136487A (en) * | 2021-04-07 | 2021-07-20 | 内蒙古金辉稀矿股份有限公司 | Preparation process of bentonite additive based on pellet production |
| CN115236984A (en) * | 2022-07-25 | 2022-10-25 | 北京佰能盈天科技股份有限公司 | Pellet rotary kiln temperature control method and device |
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