CN202595226U - System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets - Google Patents
System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets Download PDFInfo
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- CN202595226U CN202595226U CN 201220121127 CN201220121127U CN202595226U CN 202595226 U CN202595226 U CN 202595226U CN 201220121127 CN201220121127 CN 201220121127 CN 201220121127 U CN201220121127 U CN 201220121127U CN 202595226 U CN202595226 U CN 202595226U
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Abstract
A system for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets is characterized in that a pressurizing device supplies pressurizing air to a central burner combustion air so as to ensure the pressure of the combustion air is 18-25KPa; a heat source point is arranged inside a smoke hood and is used for improving the temperature of a preheating II section of a chain grate by 100-150 DEG C, ensuring sufficient heat exchange of dry pellets in the chain grate and improving the strength of the dry pellets; and a hot air supplying device supplies hot air of 500-1000 DEG C to a suction drying section and a preheating I section to increase hot air amount, so that the drying and preheating effect of raw pellets in the chain grate is improved. The system for optimizing the thermal regulations of the chain grate-rotary kiln oxidized pellets has the advantages as follows: a reasonable drying and preheating temperature gradient is formed; the drying and preheating effect is improved; energy sources are saved; haematite producing proportion can be raised from the maximum 40% to 100%; the hot air in the chain grate is sufficient and the hot air temperature meets the standard; the drying and preheating effect of the raw pellets is obviously improved; the yield is improved; the coal gas consumption is lowered; powder entering a kiln is reduced; and a phenomenon that when the powder is added into a rotary kiln at a high temperature, rings are easily formed is avoided.
Description
Technical field
The utility model relates to a kind of system that is used for the optimization grate kiln acid pellet thermal regulation on large-scale chain grate stoker-rotary kiln pelletizing method (more than 2,000,000 tons/year) production line.
Background technology
Generally greater than 55 meters, rotary kiln length is greater than 40 meters at traditional design medium chain comb captain degree for large-scale chain grate stoker-rotary kiln pelletizing method (more than 2,000,000 tons/year) production line.Its production thermal source is provided by the central burner on rotary kiln discharge port top, and thermal source supplies each position such as rotary kiln, chain-grate machine to recycle through backheat blower fan, main exhauster exhausting heat air delivery.The preheating temperature of the maturing temperature of rotary kiln, chain-grate machine improves along with the raising of using iron material rhombohedral iron ore ratio during production, and the general span of control of the maturing temperature of rotary kiln is 1300 ℃ of 1200 ∽, and the preheating temperature of chain-grate machine is controlled at 1150 ℃ of 950 ∽.Large-scale chain grate stoker-rotary kiln production line is because the rotary kiln length-to-diameter ratio is big, chain-grate machine and hot air duct are long; The temperature that hot blast arrives the chain-grate machine head can reduce by 400 ℃ of 350 ∽ than roasting in kilns temperature; The thermal source that is only provided by central burner arrives the heat of each passage, each point and progressively decays to the chain-grate machine direction from rotary kiln; Hot blast temperature through returning the chain-grate machine each point behind heating duct and each fly-ash separator is lower, causes that hot blast rate does not match on the whole piece chain-grate machine, and hot blast can not effectively satisfy drying, the preheat function of each section; Predetermined effect of producing when not reaching design; Effect was poorer when special use rhombohedral iron ore was produced, and chain-grate machine output descends about 1/3, and chain-grate machine throughput does not reach design requirements far away.In order to satisfy manufacturing technique requirent; Each of grate kiln section hot blast must mate, and has only the hot blast temperature and increase hot blast rate that improve each section of chain-grate machine, makes green-ball and hot blast that sufficient heat exchange arranged; Guarantee the drying and preheating effect of green-ball, could improve chain-grate machine output.If only increasing heat from the central burner of rotary kiln improves more than the maturing temperature to 1300 ℃; Go to remedy the shortage of heat of chain-grate machine by improving the rotary kiln baking temperature; To cause the too high and quick ring formation of rotary kiln Yin Wendu; Heat waste, energy consumption is too high, and backheat blower fan and refractory materials are all impaired and influence its life-span.
Make the heat rational Match of each section of grate kiln, each point; Thermal regulation is reasonable; The drying and preheating effect of green-ball improves, and chain-grate machine output improves, and rotary kiln is in reasonable temperature; Avoid the quick ring formation of rotary kiln, just must on grate kiln, solve a structural hot blast rate and a temperature matching technique difficult problem.
The utility model content
The purpose of the utility model just provides a kind of heat rational Match that makes each section of grate kiln, each point; Thermal regulation is reasonable; The drying and preheating effect of green-ball improves; Chain-grate machine output improves, and rotary kiln is in reasonable temperature, avoids the system of the optimization grate kiln acid pellet thermal regulation of the quick ring formation of rotary kiln.
The system of the optimization grate kiln acid pellet thermal regulation of the utility model has:
(1), pressurizing device, described pressurizing device provides pressurization wind to central burner combustion air, guarantees that combustion air pressure is 18-25Kpa;
(2), hot source point, described hot source point is arranged in the petticoat pipe, in order to improve 100-150 ℃ of chain-grate machine preheating II section temperature, guarantees that dry bulb has sufficient heat exchange at chain-grate machine, improves dry bulb intensity;
(3), the hot blast air supply device, described hot blast air supply device provides 500 ℃-1000 ℃ hot blast to the section of draining and preheating I section, in order to increase hot blast rate, green-ball is improved in the drying and preheating effect of chain-grate machine.
System also comprises more specifically:
Described pressurizing device is to adopt Roots's booster fan, and the air outlet of Roots's booster fan is connected to central combustion-supporting burner.
Described hot source point is 1-4, and hot source point is a hollow tubular, and the one of which end is communicated with outside gaspipe network, and the other end is communicated with preheating II section.
Described hot blast air supply device is at the chain-grate machine middle part hotblast stove to be set, and said hotblast stove is communicated with to the section of draining and preheating I section, and to the section of draining and preheating I section 500 ℃-1000 ℃ hot blast is provided; Described hotblast stove air outlet is positioned at the section of draining and preheating I section intersection, to the section of draining and preheating I section 500 ℃-1000 ℃ hot blast is provided simultaneously.
The utility model has the advantages that:
1, solves the grate kiln production line of producing per year more than 2,000,000 tons and used the chain-grate machine section of draining that different mineral exist when particularly the high mixture ratio rhombohedral iron ore is produced and the hot blast air quantity and the unmatched thermal regulation defective of temperature of preheating section; When 1250 ℃ of rotary kiln baking temperature 1200 ∽ produce; The rotary kiln temperature reaches 1050 ℃ of 1000 ∽; Chain-grate machine preheating II section petticoat pipe temperature reaches 1150 ℃ of 1050 ∽, the chain-grate machine box temperature reaches 550 ℃ of 450 ∽, and the chain-grate machine section of draining petticoat pipe temperature reaches 450 ℃ of 400 ∽, and chain-grate machine preheating I section petticoat pipe temperature reaches 800 ℃ of 550 ∽; Form reasonably dry, preheating temperature gradient; Improve the drying and preheating effect, day output improves 700 tons of 500 ∽, and pellet per ton can be practiced thrift 2.5 kilograms of standard coal equivalents of 1.5 ∽; Produce 2000000 tons of production lines per year by one and calculate, can increase economic efficiency 1,500 ten thousand yuan every year.
2, solve the bottleneck of rhombohedral iron ore production technology.Raising along with the rhombohedral iron ore ratio; Chain-grate machine needs higher drying and preheating temperature; Can guarantee sufficiently high hot blast temperature and hot blast rate through to increasing the flexible of hot source point after thermal regulation is optimized, the rhombohedral iron ore proportion of production can bring up to 100% from the highest 40%.
3, eliminate rotary kiln and produce the ring formation phenomenon, improve refractory life, save energy.Through improving each section of chain-grate machine temperature, each section of chain-grate machine temperature reaches reasonable ladder and rises, and has only the heat that just can add to chain-grate machine through rotary kiln high temperature directly in the chain-grate machine petticoat pipe, to replenish originally; Descend 150 ℃ of 100 ∽ of rotary kiln baking temperature, chain-grate machine hot blast air quantity is sufficient, hot blast temperature is up to standard, and the dry bulb pre-heat effect obviously improves; Gas consumption descends; The drying and preheating effect of dry bulb improves, and advances the kiln powder and reduces, and has avoided rotary kiln high temperature to add the phenomenon of the easy ring formation of powder.
Description of drawings
Accompanying drawing is the embodiment of the utility model.
Accompanying drawing 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated:
Label shown in the accompanying drawing 1 is detailed as follows: 1, and main chimney; 2, main exhauster; 3, the backheat blower fan; 4, hot source point; 5 rotary kilns; 6, central cooler; 7, Roots's booster fan; 8, chain-grate machine; 9, hotblast stove; 10, the backheat blower fan; 11, the hotblast stove petticoat pipe; 12, drum dry-air blast machine; 13, central burner.
The system of the optimization grate kiln acid pellet thermal regulation of the utility model, in legacy equipment, the technical scheme of increase has:
(1), pressurizing device, described pressurizing device provides pressurization wind to central burner combustion air, guarantees that combustion air pressure reaches 18-25Kpa;
(2), hot source point, described hot source point is arranged in the petticoat pipe, in order to improve chain-grate machine preheating II section temperature at 100-150 ℃, guarantees that dry bulb has sufficient heat exchange at chain-grate machine, improves dry bulb intensity;
(3), the hot blast air supply device, described hot blast air supply device provides 500 ℃-1000 ℃ hot blast to the section of draining and preheating I section, in order to increase hot blast rate, green-ball is improved in the drying and preheating effect of chain-grate machine.
Described pressurizing device is to adopt Roots's booster fan 7; The air outlet of Roots's booster fan 7 is connected to central combustion-supporting burner 13, enlarges the flame high-temperature zone, increases the high temperature hold-time; Improve roasting effect, improve the heatrejection that the kiln tail gets into the chain-grate machine head simultaneously.
Described hot source point 4 is 1-4, and hot source point 4 is a hollow tubular, and the one of which end is communicated with gas pipe net system, and the other end is communicated with preheating II section, further improves the temperature of chain-grate machine head preheating section.
In order to improve the drying effect of green-ball; Improve the chain-grate machine section of draining, preheating I section temperature and hot blast rate; Strengthen the heat exchange of green-ball and hot blast; Described hot blast air supply device is at the chain-grate machine middle part hotblast stove 9 to be set, and said hotblast stove 9 is communicated with to the section of draining and preheating I section, and to the section of draining and preheating I section 500 ℃-1000 ℃ hot blast is provided; Described hotblast stove 9 air outlets are positioned at the section of draining and preheating I section intersection, to the section of draining and preheating I section 500 ℃-1000 ℃ hot blast are provided simultaneously, increase hot blast rate, and green-ball is improved in the drying and preheating effect of chain-grate machine.
The working process of the utility model is: earlier the burner blower of rotary kiln central authorities burner is retrofited, change common burner blower into the Roots booster fan, improve combustion air pressure, increase high-temperature roasting district area in the kiln, thereby reduce the rotary kiln baking temperature; But secondly in chain-grate machine head petticoat pipe, increase ventilating coal gas incendiary burner hot source point 4; The hot blast that rotary kiln is passed over is able to replenish; Thereby improve 100-150 ℃ of chain-grate machine preheating II section temperature, guarantee that dry bulb has sufficient heat exchange at chain-grate machine, improve dry bulb intensity; In order to improve the drying and preheating effect of green-ball; It is not enough that light improves chain-grate machine preheating II section hot blast temperature; Also need improve the hot blast temperature and the hot blast rate of the chain-grate machine section of draining, preheating I section, strengthen the heat exchange of green-ball and hot blast, make green-ball have certain intensity; Avoid getting into high temperature section generation explosion; Therefore to the section of draining and preheating I section 500 ℃-1000 ℃ hot blast is provided through a hotblast stove 9 being set, improves hot blast temperature and increase hot blast rate, green-ball is improved in the drying and preheating effect of chain-grate machine at the chain-grate machine middle part.
Claims (5)
1. system that optimizes grate kiln acid pellet thermal regulation is characterized in that having:
(1), pressurizing device, described pressurizing device provides pressurization wind to central burner combustion air, guarantees that combustion air pressure is 18-25Kpa;
(2), hot source point, described hot source point is arranged in the petticoat pipe, in order to improve 100-150 ℃ of chain-grate machine preheating II section temperature, guarantees that dry bulb has sufficient heat exchange at chain-grate machine, improves dry bulb intensity;
(3), the hot blast air supply device, described hot blast air supply device provides 500 ℃-1000 ℃ hot blast to the section of draining and preheating I section, in order to increase hot blast rate, green-ball is improved in the drying and preheating effect of chain-grate machine.
2. the system of optimization grate kiln acid pellet thermal regulation according to claim 1 is characterized in that described pressurizing device is to adopt Roots's booster fan, and the air outlet of Roots's booster fan is connected to central combustion-supporting burner.
3. the system of optimization grate kiln acid pellet thermal regulation according to claim 1 is characterized in that described hot source point is 1-4, and hot source point is a hollow tubular, and the one of which end is communicated with outside coal gas system, and the other end is communicated with preheating II section.
4. the system of optimization grate kiln acid pellet thermal regulation according to claim 1; It is characterized in that described hot blast air supply device is at the chain-grate machine middle part hotblast stove to be set; Said hotblast stove is communicated with to the section of draining and preheating I section, and to the section of draining and preheating I section 500 ℃-1000 ℃ hot blast is provided.
5. the system of optimization grate kiln acid pellet thermal regulation according to claim 4; It is characterized in that described hotblast stove air outlet is positioned at the section of draining and preheating I section intersection, provides 500 ℃-1000 ℃ hot blast to the section of draining and preheating I section simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220121127 CN202595226U (en) | 2012-03-28 | 2012-03-28 | System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220121127 CN202595226U (en) | 2012-03-28 | 2012-03-28 | System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets |
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| CN202595226U true CN202595226U (en) | 2012-12-12 |
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| CN 201220121127 Expired - Fee Related CN202595226U (en) | 2012-03-28 | 2012-03-28 | System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586592A (en) * | 2012-03-28 | 2012-07-18 | 柳州钢铁股份有限公司 | Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation |
| CN104748558A (en) * | 2013-12-27 | 2015-07-01 | 中冶长天国际工程有限责任公司 | Tailing preheating device of reduction kiln |
-
2012
- 2012-03-28 CN CN 201220121127 patent/CN202595226U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586592A (en) * | 2012-03-28 | 2012-07-18 | 柳州钢铁股份有限公司 | Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation |
| CN102586592B (en) * | 2012-03-28 | 2013-09-25 | 柳州钢铁股份有限公司 | Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation |
| CN104748558A (en) * | 2013-12-27 | 2015-07-01 | 中冶长天国际工程有限责任公司 | Tailing preheating device of reduction kiln |
| CN104748558B (en) * | 2013-12-27 | 2017-01-18 | 中冶长天国际工程有限责任公司 | Tailing preheating device of reduction kiln |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20130328 |