CN102586590B - Drying system and method of cold-consolidated pellets - Google Patents
Drying system and method of cold-consolidated pellets Download PDFInfo
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- CN102586590B CN102586590B CN 201210059354 CN201210059354A CN102586590B CN 102586590 B CN102586590 B CN 102586590B CN 201210059354 CN201210059354 CN 201210059354 CN 201210059354 A CN201210059354 A CN 201210059354A CN 102586590 B CN102586590 B CN 102586590B
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Abstract
The invention discloses a drying system and method of cold-consolidated pellets. Hot smoke gas generated by a hot smoke gas source enters into the circulating drying system through a hot smoke gas inlet main pipe, a drying effect is further generated, and the smoke gas of a first circulating air pipe can return to the hot gas source through a first induced draft fan for being used as supplementary heat of the gas source for circulating use; and the smoke gas of a second circulating air pipe is exhausted through a waste smoke gas treatment system. The drying system disclosed by the invention adopts the low-temperature and high-air speed fast drying method, the requirements on drying the gas source are reduced, the exhaust temperature of the smoke gas after drying is reduced by about 80 DEGC, the using efficiency of the smoke gas is improved, and the drying system has the advantages of good drying effect, high drying efficiency, good product quality, simple structure, convenience in maintenance, good changeability, cost conservation, good utilization of energy and environment-friendly property.
Description
Technical field
The present invention relates to a kind of drying system and furnace drying method, particularly a kind of cold bound pellet drying system and method.
Background technology
The baking operation of cold bound pellet is to enter the former process that rotary hearth furnace carries out direct reduction reactor.Because the moisture after the treated moulding of cold bound pellet is about 10%, belongs to wet bulb, if wet bulb enter rotary hearth furnace directly reduction have following problem:
The wet bulb physical strength is not enough, is easy to generate viscous deformation, and powdered is more, influences output;
Cold bound pellet is subjected to the influence of " break temperature " (general 400 ~ 450 ℃), and it is cracked or " explosion " at pre-heating stage (preheating temperature is higher than 900 ℃), and powder is more, influences the atmosphere of output and rotary hearth furnace;
Therefore, cold bound pellet must carry out drying before entering rotary hearth furnace, and moisture is reached below 2%, satisfies processing requirement.
The oven dry of cold bound pellet mainly is gas drying, and thermal source is the hot flue gas of certain temperature and humidity, the moisture content of pelletizing is removed the purpose that reaches dry by hot flue gas.
By theoretical investigation and continuous Test Summary, the cold bound pellet oven dry need meet the following conditions:
Hot flue gas has certain temperature and humidity, but humidity must be lower than the equilibrium moisture of pelletizing, has only when smoke moisture is lower than the pelletizing equilibrium moisture, and moisture content could enter hot flue gas by pelletizing;
Drying process is divided into surface gasification control and two kinds of situations of internal divergence control, shows with test that after deliberation cold bound pellet belongs to the internal divergence control mode, so should (0.9 ~ 1.5m/m2s) dries with big wind speed in drying course;
Consider carbon content (12% ~ 20%) in the cold bound pellet and the burst temperature of pelletizing, so flue-gas temperature should adopt (250 ~ 400 ℃).
According to some above condition, problem such as the system and method for at present cold bound pellet being dried can't meet the demands, and exists long, the hot exhaust gas volumn consumption of drying time excessive, and production efficiency is low.
So, need a kind of new technical scheme to address the above problem.
Summary of the invention
At above-mentioned existing in prior technology problem and shortage, the purpose of this invention is to provide a kind of drying system and method for cold bound pellet, this system has good drying effect, the drying efficiency height, good product quality, simple in structure, be convenient to safeguard; Commutativity is good, cost savings; Energy utilization is good, eco-friendly advantage.
For achieving the above object, cold bound pellet drying system of the present invention can adopt following technical scheme:
A kind of cold bound pellet drying system comprises hot flue gas source of the gas, the circulation air feed system that is connected with hot flue gas source of the gas, the dryer equipment that is connected with the circulation air feed system and useless smoke processing system;
Described circulation air feed system comprises the hot flue gas inlet manifold who is connected with hot flue gas source of the gas, the first circulation airduct that is connected with hot flue gas inlet manifold, first fly-ash separator with the first recirculating air pipe coupling, first induced draft fan that connects first fly-ash separator and hot flue gas source of the gas simultaneously, the same second circulation airduct that is connected with hot flue gas inlet manifold, second fly-ash separator with the second recirculating air pipe coupling, second induced draft fan that connects second fly-ash separator, the header pipe who is connected with second induced draft fan, extend in dryer equipment both sides and a pair of air-supply that is connected with dryer equipment respectively is in charge of from the header pipe; Described dryer equipment comprises high temperature section and low-temperature zone, and described air-supply is in charge of with low-temperature zone and is connected; Described low-temperature zone is connected with useless smoke processing system.
Cold bound pellet furnace drying method of the present invention can adopt following technical scheme:
The hot flue gas that hot flue gas source of the gas produces enters the circulation drying system and produces drying effect by hot flue gas inlet manifold, cold bound pellet is moved and receives in moving process the oven dry effect of hot flue gas to high temperature section from low-temperature zone; The flue gas of the first circulation airduct returns the hot gas source by the effect of first induced draft fan and recycles as the source of the gas additional heat; The flue gas of the second circulation airduct is got rid of by useless smoke processing system.
The present invention is compared with prior art: because the present invention adopts the flash baking method of low temperature, big wind speed, reduced the requirement of oven dry source of the gas, exhaust temperature is low about 80 ℃ in the flue gas after oven dry, improved the service efficiency of flue gas, has good drying effect, the drying efficiency height, good product quality, simple in structure, be convenient to safeguard; Commutativity is good, cost savings; Energy utilization is good, eco-friendly advantage.
Description of drawings
Fig. 1 is the structural representation of cold bound pellet drying system of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand following embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Please in conjunction with shown in Figure 1, the present invention discloses a kind of cold bound pellet drying system and method, this cold bound pellet drying system comprises hot flue gas source of the gas 1, the circulation air feed system that is connected with hot flue gas source of the gas 1, the dryer equipment 3-1 that is connected with the circulation air feed system and useless smoke processing system.Wherein, described hot flue gas source of the gas comprises temperature at 250 ~ 400 ℃ of flue gas kiln gass, waste heat flue gas or other thermal source flue gases, owing to adopt big wind speed (0.9 ~ 1.5m/m2s), exhaust gas volumn is big, humidity requirement is not high in the flue gas, and (30 ~ 80g/Kg), pressure is not done requirement to humidity.The circulation air feed system is established pressure detection, temperature detection, the some points of flow detection
Described circulation air feed system comprises the hot flue gas inlet manifold 2-1 that is connected with hot flue gas source of the gas 1,2-2 is with hot flue gas inlet manifold 2-1, the first circulation airduct 4-1-1 that 2-2 connects, the first fly-ash separator 4-1-2 that is connected with the first circulation airduct 4-1-1, the first induced draft fan 4-1-3 that connects the first fly-ash separator 4-1-2 and hot flue gas source of the gas 1 simultaneously, equally with hot flue gas inlet manifold 2-1, the second circulation airduct 4-2-1 that 2-2 connects, the second fly-ash separator 4-2-2 that is connected with the second circulation airduct 4-2-1, the second induced draft fan 4-2-3 that connects the second fly-ash separator 4-2-2, the header pipe 4-2-4 that is connected with the second induced draft fan 4-2-3, extend in dryer equipment 3-1 both sides and 4-2-5 is in charge of in a pair of air-supply that is connected with dryer equipment 3-1 respectively from header pipe 4-2-4,4-2-6; Described dryer equipment 3-1 comprises high temperature section and low-temperature zone, and described air-supply is in charge of 4-2-5,4-2-6 and is connected with low-temperature zone; Described low-temperature zone is connected with useless smoke processing system.Described useless smoke processing system comprises waste heat flue gas house steward 5-1,5-2, the fly-ash separator 5-3, the dedusting fan 5-4 that is connected with fly-ash separator 5-3 that are connected with described waste heat flue gas house steward 5-1,5-2 and the chimney 5-5 that connects dedusting fan 5-4.Be coated with lightweight refractory in described flue gas inlet manifold 2-1, the 2-2.The skin of the described first circulation airduct 4-1-1 and the second circulation airduct 4-2-1 is enclosed with refractory fibre.In the present embodiment, described dryer adopts grate type drying machine, and the oven dry area can be up to 0.8 ~ 1t/m2, and material thickness is 50 ~ 250mm; Dryer speed is that frequency conversion is adjustable, 1.2 ~ 2.14m/min; Establish some temperature, pressure detection point in the dryer; Establish some temperature, pressure detection point in the dryer; And the anti-material of spraying lightweight in the dryer is to guarantee quality and the life-span of dryer.In the present embodiment, establish fly-ash separator before the induced draft fan and can reduce big dust particle in the flue gas, the blade of protection induced draft fan improves work-ing life.
Use the cold bound pellet furnace drying method of above-mentioned cold bound pellet drying system to be: the hot flue gas that hot flue gas source of the gas 1 produces enters the circulation drying system and produces drying effect by hot flue gas inlet manifold 2-1,2-2, cold bound pellet is moved and receives in moving process the oven dry effect of hot flue gas to high temperature section from low-temperature zone; The flue gas of the first circulation airduct 4-1-1 returns hot gas source 1 by the effect of the first induced draft fan 4-1-3 and recycles as the source of the gas additional heat; The flue gas of the second circulation airduct 4-2-1 is got rid of by useless smoke processing system.
The present invention adopts the flash baking method of low temperature, big wind speed, has reduced the requirement of oven dry source of the gas, and exhaust temperature is low about 80 ℃ in the flue gas after oven dry, improved the service efficiency of flue gas, had good drying effect, the drying efficiency height, good product quality, simple in structure, be convenient to safeguard; Commutativity is good, cost savings; Energy utilization is good, eco-friendly advantage.
Claims (6)
1. cold bound pellet drying system is characterized in that: comprise hot flue gas source of the gas (1), the circulation air feed system that is connected with hot flue gas source of the gas (1), the dryer equipment (3-1) and the useless smoke processing system that are connected with the circulation air feed system;
Described circulation air feed system comprises the hot flue gas inlet manifold (2-1 that is connected with hot flue gas source of the gas (1), 2-2), with hot flue gas inlet manifold (2-1,2-2) the first circulation airduct (4-1-1) of Lian Jieing, first fly-ash separator (4-1-2) that is connected with the first circulation airduct (4-1-1), first induced draft fan (4-1-3) that connects first fly-ash separator (4-1-2) and hot flue gas source of the gas (1) simultaneously, equally with hot flue gas inlet manifold (2-1,2-2) the second circulation airduct (4-2-1) of Lian Jieing, second fly-ash separator (4-2-2) that is connected with the second circulation airduct (4-2-1), second induced draft fan (4-2-3) that connects second fly-ash separator (4-2-2), the header pipe (4-2-4) who is connected with second induced draft fan (4-2-3), extend in dryer equipment (3-1) both sides and (4-2-5 is in charge of in a pair of air-supply that is connected with dryer equipment (3-1) respectively from header pipe (4-2-4), 4-2-6); Described dryer equipment (3-1) comprises high temperature section and low-temperature zone, and described air-supply is in charge of (4-2-5,4-2-6) and is connected with low-temperature zone; Described low-temperature zone is connected with useless smoke processing system.
2. cold bound pellet drying system according to claim 1 is characterized in that: described useless smoke processing system comprises waste heat flue gas house steward (5-1,5-2), the fly-ash separator (5-3) that is connected with described waste heat flue gas house steward (5-1,5-2), the dedusting fan (5-4) that is connected with fly-ash separator (5-3) and the chimney (5-5) that connects dedusting fan (5-4).
3. cold bound pellet drying system according to claim 1 is characterized in that: be coated with lightweight refractory in the described flue gas inlet manifold (2-1,2-2).
4. cold bound pellet drying system according to claim 1, it is characterized in that: the skin of the described first circulation airduct (4-1-1) and the second circulation airduct (4-2-1) is enclosed with refractory fibre.
5. cold bound pellet drying system according to claim 1 is characterized in that: described dryer employing grate type drying machine.
6. the furnace drying method of cold bound pellet drying system according to claim 1, it is characterized in that: the hot flue gas that hot flue gas source of the gas (1) produces enters the circulation drying system and produces drying effect by hot flue gas inlet manifold (2-1,2-2), cold bound pellet is moved and is subjected in moving process the oven dry effect of hot flue gas to high temperature section from low-temperature zone; The flue gas of the first circulation airduct (4-1-1) returns hot flue gas source of the gas (1) by the effect of first induced draft fan (4-1-3) and recycles as the source of the gas additional heat; The flue gas of the second circulation airduct (4-2-1) is got rid of by useless smoke processing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210059354 CN102586590B (en) | 2012-03-08 | 2012-03-08 | Drying system and method of cold-consolidated pellets |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210059354 CN102586590B (en) | 2012-03-08 | 2012-03-08 | Drying system and method of cold-consolidated pellets |
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| CN102586590A CN102586590A (en) | 2012-07-18 |
| CN102586590B true CN102586590B (en) | 2013-09-04 |
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| CN 201210059354 Expired - Fee Related CN102586590B (en) | 2012-03-08 | 2012-03-08 | Drying system and method of cold-consolidated pellets |
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| CN112944931A (en) * | 2021-04-01 | 2021-06-11 | 昆山宇顺环保科技有限公司 | Device for drying lump ore by using low-temperature flue gas circulation of kiln |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2722159Y (en) * | 2004-06-10 | 2005-08-31 | 济南钢铁股份有限公司 | Drier of artificial pellets |
| CN101135536A (en) * | 2007-03-16 | 2008-03-05 | 大连熔融还原设备制造有限公司 | Drying furnace of metallization ball and drying method thereof |
| CN101696847A (en) * | 2009-10-29 | 2010-04-21 | 莱芜钢铁股份有限公司 | Self-shunting double-layer drying bed |
| CN102175073A (en) * | 2011-02-24 | 2011-09-07 | 中冶北方工程技术有限公司 | Iron ore concentrate drying device and method for pelletizing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202511599U (en) * | 2012-03-08 | 2012-10-31 | 江苏沙钢集团有限公司 | Baking system for cold bound pellet |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2722159Y (en) * | 2004-06-10 | 2005-08-31 | 济南钢铁股份有限公司 | Drier of artificial pellets |
| CN101135536A (en) * | 2007-03-16 | 2008-03-05 | 大连熔融还原设备制造有限公司 | Drying furnace of metallization ball and drying method thereof |
| CN101696847A (en) * | 2009-10-29 | 2010-04-21 | 莱芜钢铁股份有限公司 | Self-shunting double-layer drying bed |
| CN102175073A (en) * | 2011-02-24 | 2011-09-07 | 中冶北方工程技术有限公司 | Iron ore concentrate drying device and method for pelletizing |
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