CN205228172U - A hot air system and smelting device for smelt - Google Patents
A hot air system and smelting device for smelt Download PDFInfo
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- CN205228172U CN205228172U CN201520880248.1U CN201520880248U CN205228172U CN 205228172 U CN205228172 U CN 205228172U CN 201520880248 U CN201520880248 U CN 201520880248U CN 205228172 U CN205228172 U CN 205228172U
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Abstract
The utility model relates to a hot air system and the melting reduction iron -smelting device of melting reduction iron -smelting technology, this hot air system includes: gas transmission pipeline, it is connected with the air feed source, the hot -blast main, it is connected with gas transmission pipeline, at least a part of preprocessing device who lies in the iron -smelting furnace charge of hot -blast main, the jetting pipeline, it passes through the pipe connection with the hot -blast main for it is gaseous to smelting furnace supply jetting. The utility model discloses can provide pressure stability's air or oxygen -rich gas, air or oxygen -rich gas are through carrying out the heat exchange with the high temperature burner gas, and air or oxygen -rich gas temperature can be heated to according with air or the oxygen -rich gas that the smelting furnace jetting required after the heat exchange, have save expensive equipment such as hot -blast furnace, have saved the cost.
Description
Technical field
The utility model belongs to technical field of metallurgical equipment, particularly a kind of hot-air system for iron-smelting process and iron-smelting device.
Background technology
Current blast furnace remains the main force of metallurgy industry ironmaking, its advantage is that the furnace life of blast furnace is long, production capacity is large, it is simple and easy to operate, but because blast furnace process is long, capital cost is high, equipment is complicated, energy consumption is high, environmental pollution is serious, coke resource is non-renewable, when market energy shortage, increasingly competitive, the sight of people turns to exploitation non-blast furnace ironmaking technique and ironmaking equipment gradually.
Without the target that burnt low stain is non-blast furnace ironmaking new technology.Non-blast furnace ironmaking technique, can be divided into " direct-reduction process " and " smelting reduction process " two large class.Existing non-blast furnace ironmaking needs independently hot-air system, and the hot blast generally providing temperature higher by combustion furnace is jetted, and needs to consume a large amount of energy.
Summary of the invention
For above Problems existing, through studying for a long period of time, the utility model, for iron-smelting process, proposes a kind of hot blast feeding system, can realize low consumption ironmaking in more economical way.
The utility model provides a kind of hot-air system for smelting process, and comprising: gas transmission pipeline, it is connected with air supply source; Warm-air pipe, it is connected with gas transmission pipeline, the pretreatment unit being positioned at furnace charge at least partially of described warm-air pipe; Winding-up pipeline, it is connected by pipeline with warm-air pipe, for supplying blowing gas to smelting furnace.
The gas of air supply source is generally gas at normal temperature, inputs gas transmission pipeline by one or more roots blower by pipeline.Described gas can be air or oxygen rich gas, and wherein oxygen can be provided by such as liquid oxygen storage tank, and the pipeline of connection liquid oxygen storage tank is provided with check (non-return) valve.
In order to maintain the gas pressure of gas transmission pipeline, one or more high pressure storage gas tank being set and being connected to gas transmission pipeline, Self force valve is set between the two; Realize storing delivered in cylinders gases at high pressure to high pressure by air compressor.
Gas transmission pipeline arranges air quantity and/or blast and/or wind speed detection device, when not meeting predetermined value, Self force valve utilizes feedback signal (pressure, pressure reduction etc.) to be delivered to executing agency by signal pipe and drives flap to change the aperture of valve, reach the object regulating pressure, flow.
Warm-air pipe is arranged in the pretreatment unit of iron-smelting furnace charge by the utility model at least partially, described pretreatment unit realizes carrying out drying, preheating and roasting to furnace charge, it is selected from tunnel cave, drying grate, rotary kiln, shaft furnace, the common apparatus such as stove of turning, the drying of furnace charge briquet, preheating and roasting are convenient to subsequent smelting technique by this equipment, realize energy-saving and emission-reduction, and enhance productivity, need if desired to transform these equipment, the temperature realizing different operation controls.According to the technological requirement of smelting furnace, furnace charge block is normal temperature ~ 80 DEG C in the temperature of dryer section, is 80 ~ 600 DEG C in the temperature of preheating section, is 600 ~ 1200 DEG C in the temperature of furnace zone.Heat by heat exchange through warm-air pipe, is sent in smelting furnace, is reduced cost by gas, saves energy consumption.
Further, described warm-air pipe is connected with gas transmission pipeline, pipeline of jetting, and described warm-air pipe is made up of heat proof material, such as 310S stainless steel.
Preferably, the S-type layout pipeline of described warm-air pipe, the pipeline be parallel to each other that such as single or multiple lift is arranged, pipeline is supported by the bracing or strutting arrangement in pretreatment unit, and bracing or strutting arrangement comprises the supporting way such as brace summer, some support.Through heat exchange fully in pretreatment unit, the gas (air or oxygen rich gas) in warm-air pipe is preheated to predetermined temperature, and its temperature can be preheated to 400-800 DEG C.In order to detect gas pressure in warm-air pipe and temperature, warm-air pipe is provided with blast and/or wind speed and/or temperature-detecting device.
Preferably, described bracing or strutting arrangement is hollow structure, and inner ventilation cools.Can be outside equipped with blower fan at pretreatment unit, the empty internal that cold wind passes into bracing or strutting arrangement introduced by blower fan, cools, to ensure the structural strength of bracing or strutting arrangement to bracing or strutting arrangement for this reason.
Further, described winding-up pipeline is the endless tube around smelting furnace, endless tube is communicated with one or more spray gun, such as 4, for jetting through pre-warmed oxygen enrichment or air in smelting furnace.
The utility model also relate to a kind of smelting device, comprising: aforesaid hot-air system; Pretreatment unit, carries out drying, preheating and roasting to furnace charge; Smelting furnace, carries out melting and reducing to furnace charge.
Further, the high temperature CO furnace gas produced in fusion process returns in pretreatment unit, is blown into secondary air CO furnace gas is burnt completely in pretreatment unit in pretreatment unit, and the heat of generation realizes drying to furnace charge, preheating and roasting.The i.e. waste heat of dry, preheating and the roasting furnace gas that mainly utilizes smelting furnace to produce, directly-fired kiln material, smelting furnace no longer needs other bootstrap systems additional and equipment.
Furnace charge can be the oxide of various metal oxide, preferred iron, such as, ferrous grade can be used to be greater than 55%(mass percent) Iron concentrate, it forms furnace charge block with addition of certain fuel, additive, and fuel alternative is as coke, bituminous coal, anthracite.When the temperature of furnace charge reaches more than 500 DEG C, there is spontaneous combustion, produce a large amount of heats, in order to improve the temperature of furnace charge itself and supplementary preheating, dry institute calorific requirement.Autoignition time is longer, and reduction reaction is more abundant, and environment temperature higher (environment residing for furnace charge), the trend of spontaneous combustion is stronger.When charge-temperature reaches more than 500 DEG C simultaneously, when being generally 500 ~ 550 DEG C, spontaneous combustion occurs, start the reduction process of the oxide entering iron, the time is longer, and temperature is higher, and reducing degree is higher.Therefore the hot-air system of the application can be advantageously applied to melting, reducing and smelting technique.
After have employed technique scheme, the utility model stores by roots blower, liquid oxygen storage tank, high pressure the oxygen rich gas that gas tank can provide pressure stability, high-temperature furnace gas in air in hot air apparatus or oxygen rich gas and pretreatment unit carries out heat exchange, after heat exchange, air or oxygen rich gas temperature can be heated to the air or oxygen rich gas that meet smelting furnace winding-up requirement, eliminate the expensive device such as hot-blast stove, provide cost savings.
Further, the utility model not only can be used in iron-smelting process, also may be used for smelting in the technique of other metals, and its principle is similar.
Accompanying drawing explanation
Fig. 1 is hot-air system flow chart of the present utility model;
Fig. 2 is the structural representation of hot-air system of the present utility model;
Fig. 3 is the front view of smelting furnace of the present utility model;
Fig. 4 is the side view of pretreatment unit of the present utility model;
In figure, 1. cold wind stay pipe, 2. brace summer, 3. gas transmission pipeline, 4. warm-air pipe, 5. tunnel cave, 6. check (non-return) valve, 7. liquid oxygen storage tank, 8. air compressor, 9. high pressure stores gas tank, 10. blower fan, 11. winding-up endless tubes, 12. spray guns, 13. roots blowers (1), 14. roots blowers (2), 15. Self force valve, 16. smelting furnaces, 19. flanges, 17. water cooling tubes, 18. furnace charge blocks, 19. kiln cars.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, each embodiment of the present utility model is explained in detail.But, persons of ordinary skill in the art may appreciate that in each embodiment of the utility model, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following embodiment and amendment, each claim of the application technical scheme required for protection also can be realized.
As shown in Figure 1, 2, a kind of hot-air system for smelting, it comprises gas transmission pipeline (3), it connects 2 roots blowers (13,14), simultaneously liquid oxygen storage tank (7) by check (non-return) valve (6) to Cemented filling oxygen, high pressure stores gas tank (9) by Self force valve (15) to Cemented filling gases at high pressure, air compressor (8) stores gas tank (9) conveying gas to high pressure, and three road gases are delivered on gas transmission pipeline, provide the oxygen rich gas that constant pressure, oxygen content are adjustable.Those skilled in the art should understand, when blower fan can provide stable gas, then can consider to be made by Valve controlling that high pressure stores gas tank (9), liquid oxygen storage tank (7) wouldn't work, and when supply of electric power is unstable, made by Valve controlling that high pressure stores gas tank (9), liquid oxygen storage tank (7) provides gas to pipeline (3), the constant pressure of pipeline gas can be maintained.
Gas transmission pipeline (3) is connected with warm-air pipe (4) by flange etc., the major part of warm-air pipe (4) is positioned at tunnel cave (5), it will be understood by those skilled in the art that, other pre-processing device, such as drying grate, rotary kiln, shaft furnace, the common apparatus such as stove of turning also can be used as pretreatment unit of the present utility model, need if desired to transform these equipment, the temperature realizing different process section controls.
Warm-air pipe (4) is provided with blast, wind speed, temperature-detecting device (not shown), detects the pressure and temperature of air or oxygen rich gas with this, guarantee the stable operation of technique.Warm-air pipe (4) is generally made up of heating resisting metal, such as 310S stainless steel.
As shown in Figure 3; warm-air pipe (4) is connected with winding-up endless tube (11) by flange, pipeline; winding-up endless tube (11) is arranged around smelting furnace (16); 4 spray guns (12) are connected in winding-up endless tube (11); for supplying blowing gas to smelting furnace (16); in order to protect spray gun to use under the high temperature conditions, arrange the cooling devices such as water cooling tube (17) and cool spray gun (12), cooled water is capable of circulation to be recycled in cooling tower.
As shown in Figure 2,4, the pipeline that the S-type multilayer of warm-air pipe (4) is parallel to each other, such as, be set to the arrangement of 2 times 3, and warm-air pipe (4) pipeline is supported by the brace summer (2) in tunnel cave (5); Brace summer (2) is hollow structure, the cold wind stay pipe (1) running through brace summer is provided with in hollow structure, blower fan (10) is outside equipped with at tunnel cave (5), enter empty internal by blower fan (10) introducing cold wind to cool brace summer (2), ensure the structural strength of brace summer (2).
According to the hot blast feeding system shown in figure, air or the oxygen rich gas that gas tank can provide pressure stability is stored by roots blower, liquid oxygen storage tank, high pressure, heat exchange is carried out with the high-temperature furnace gas in tunnel cave in air or oxygen rich gas process of passing through tunnel kiln, tunnel kiln body length is generally 50 meters ~ 150 meters, briquet is normal temperature ~ 80 DEG C in the operating temperature of dryer section, it is 80 ~ 600 DEG C in the operating temperature of preheating section, in the operating temperature 600 ~ 1200 DEG C of furnace zone.After heat exchange, air or oxygen rich gas temperature can be heated to 400 ~ 800 DEG C, eliminate the expensive device such as the conventional hot-blast stove of prior art, provide cost savings.
As Fig. 3, shown in 4, furnace charge block (18) in tunnel cave (5) through super-dry, after preheating and roasting, smelting furnace (16) is entered with 800 ~ 1200 DEG C, winding-up source of the gas is after described hot-air system, especially through with the furnace gas heat exchange in tunnel cave (5) after be preheated to 400 ~ 800 DEG C, spray in smelting furnace by spray gun (12), enter after smelting furnace (16) until solid charge block, under the winding-up effect of hot blast, the carbon vigorous combustion of separating out in solid charge, furnace temperature is not less than 1500 DEG C, the molten iron of fusing is separated with the Disengagement zone that slag enters smelting furnace, discharge from tapping hole and slag notch (not shown) respectively again, complete iron-smelting process.
The explanation of above embodiment is just for helping method and the core concept thereof of understanding this programme.It should be pointed out that under the prerequisite not departing from this programme principle, can also carry out some improvement to this programme, these improvement fall in the protection domain of this programme claim too.
Claims (10)
1. the hot-air system for smelting, is characterized in that, comprising:
Gas transmission pipeline, it is connected with air supply source;
Warm-air pipe, it is connected with gas transmission pipeline, the pretreatment unit being positioned at furnace charge at least partially of described warm-air pipe;
Winding-up pipeline, it is connected by pipeline with warm-air pipe, for supplying blowing gas to smelting furnace.
2. hot-air system according to claim 1, is characterized in that: described gas transmission pipeline connects one or more blower fan.
3. hot-air system according to claim 2, is characterized in that: liquid oxygen storage tank and/or high pressure are stored gas tank and be connected with described gas transmission pipeline by pipeline.
4. hot-air system according to claim 1, is characterized in that: described warm-air pipe is provided with blast and/or wind speed and/or temperature-detecting device.
5. hot-air system according to claim 1, is characterized in that: described warm-air pipe is S-type layout pipeline, and pipeline is supported by the bracing or strutting arrangement in pretreatment unit.
6. hot-air system according to claim 5, is characterized in that: described bracing or strutting arrangement is hollow structure, and inner ventilation cools.
7. hot-air system according to claim 1, is characterized in that: described pretreatment unit is used for carrying out drying, preheating and roasting to melting furnace charge.
8. hot-air system according to claim 1, is characterized in that: described winding-up pipeline is circular layout around smelting furnace, and described winding-up pipeline connects one or more spray gun.
9. hot-air system according to claim 1, is characterized in that: described warm-air pipe is made up of heat proof material.
10. a smelting device, is characterized in that, comprising:
Hot-air system as described in any one of claim 1-7;
Pretreatment unit, carries out drying, preheating and roasting to furnace charge;
Smelting furnace, carries out melting and reducing to the furnace charge after roasting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520880248.1U CN205228172U (en) | 2015-11-07 | 2015-11-07 | A hot air system and smelting device for smelt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520880248.1U CN205228172U (en) | 2015-11-07 | 2015-11-07 | A hot air system and smelting device for smelt |
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| Publication Number | Publication Date |
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| CN205228172U true CN205228172U (en) | 2016-05-11 |
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| CN201520880248.1U Active CN205228172U (en) | 2015-11-07 | 2015-11-07 | A hot air system and smelting device for smelt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110906744A (en) * | 2019-11-29 | 2020-03-24 | 福泉市泾评环保炉业有限公司 | Oxygen increasing device of energy-saving furnace |
-
2015
- 2015-11-07 CN CN201520880248.1U patent/CN205228172U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110906744A (en) * | 2019-11-29 | 2020-03-24 | 福泉市泾评环保炉业有限公司 | Oxygen increasing device of energy-saving furnace |
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