CN201220948Y - Apparatus for preventing high temperature directly reduced iron from being reoxidated - Google Patents
Apparatus for preventing high temperature directly reduced iron from being reoxidated Download PDFInfo
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- CN201220948Y CN201220948Y CNU2008200059679U CN200820005967U CN201220948Y CN 201220948 Y CN201220948 Y CN 201220948Y CN U2008200059679 U CNU2008200059679 U CN U2008200059679U CN 200820005967 U CN200820005967 U CN 200820005967U CN 201220948 Y CN201220948 Y CN 201220948Y
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- reduced iron
- furnace
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- gas
- atmosphere protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The utility model provides a device for preventing high-temperature direct reduction iron from being reoxidized. The counterflow of the gas outside a furnace is isolated through a special atmosphere protecting and cooling zone arranged in an annular reducing furnace close to an outlet part, the furnace pressure of the reducing furnace is maintained, a cold protective gas is introduced into the furnace to reduce the temperature of the reduced iron, and simultaneously the reducing atmosphere is protected, therefore not only the problem of the reoxidation of the reduced iron before being discharged is solved, but also the operating environment of a discharging machine is improved; the reduced iron is not oxidized and not bonded, and the service life of the discharging machine is prolonged, thereby ensuring that the whole metal production flow in the comprehensive recovery complex ore is more smooth and all processes are continuous under the automatic control of a thermal process control system.
Description
Technical field
The utility model relates to a kind of device that prevents that the high temperature direct-reduced iron from reoxidizing, and particularly relates to protecting the device that it is not reoxidized to adopting low calorie fuels to carry out the direct reductive reduced iron of high temperature.
Background technology
The product of coal-based direct reduction is a reduced iron, reduction must be carried out under the high temperature about 1300 ℃ and finish, product also is in the pyritous environment, and this as easy as rolling off a log reoxidizing when high temperature of reduced iron, this is one of problem that hinders direct-reduced iron production and development.Moreover, hydrogen in the coal gas is after burning, there is a large amount of water vapors to be present in the furnace gas, water vapor has stronger oxidisability, make at high temperature reduced iron may because of and water vapor acting oxidation takes place once more, reoxidize as effectively not preventing, this technology just can not obtain qualified reduced iron product, has also increased production cost simultaneously greatly.At present, how protecting reductive reduced iron not oxidation before coming out of the stove is a major issue, and this is the main difficult point that low calorie fuels is used for coal-based direct reduction.
In addition, firm reductive reduced iron in reduction furnace, the height that temperature is suitable, if use spiral discharging machine machinery discharging at once in the reduction furnace outlet, because spiral discharging machine is directly to contact with the pyritous reduced iron, rely on the rotation of its impeller that high temperature reduction iron is scraped, " conglomeration " that reduced iron may produce bulk because of bonding, block discharging machine and discharging machine is damaged, and, hinder the molten minute stove that the reduced iron product is transported to next technology of reduction furnace because the high temperature of reduction furnace greatly reduces the life-span of discharging machinery.How to reduce the furnace temperature of coming out of the stove of reduced iron, prevent the bonding of reduced iron self, the Working environment that improves discharging machine also is crucial.
The utility model content
The purpose of this utility model provides a kind of device that prevents that the high temperature direct-reduced iron from reoxidizing; by near the outlet position a special atmosphere protection and cooling zone being set at annular reduction furnace; feed cold shielding gas; reduce the temperature of reduced iron; reduced iron is protected and cooled off, solved the reoxidation before reduced iron is come out of the stove and the problem of the above-mentioned Working environment that improves discharging machine simultaneously.
In order to realize the purpose of this utility model; Reach not oxidation of reduced iron, non-caked, improve the life-span of discharging machine, guarantee comprehensive more smooth and each technology quantity-produced technique effect of whole production flow process that reclaims the metal in the complex ore; The device that the high temperature direct-reduced iron reoxidizes that prevents that the utility model provides comprises following technical scheme; described device is arranged in the annular reduction furnace 1; in annular reduction furnace burner hearth near the zone of reduced iron 5 dischargings; a special atmosphere protection and cooling zone 2 are set; this zone is made of the furnace chamber space that the preceding trapping wall 3 that is in high reducing atmosphere district, the back trapping wall 4 that is in contiguous reduced iron discharge zone, reduction furnace roof and rotating furnace bottom surround jointly, is used to isolate the convection current of the inside and outside gas of stove.The bottom of trapping wall 3, back trapping wall 4 all has opening before described; be used to make reduced iron 5 not isolated through described atmosphere protection and cooling zone 2 smoothly; the height of described opening should keep keeping in described atmosphere protection and the cooling zone 2 furnace pressure of reduction furnace, and isolating exterior gas enters this cooling zone and do not produce airborne dust simultaneously.Spray into cold shielding gas in described atmosphere protection and cooling zone 2, the shielding gas that has than strong reducing property atmosphere is tightly covered on the reduced iron 5, protect it no longer oxidized, cooling is through the temperature of the reduced iron in this district simultaneously.
Described cold shielding gas is the strong reducing property cooled coal gas with high reducing atmosphere, and described cooled coal gas sprays in the stove by the nozzle 6 that is arranged on the reduction furnace end from cooled coal gas house steward 7.Described nozzle 6 moves the direction setting of output in stove in face of reduced iron 5.
The preceding trapping wall 3 of described atmosphere protection and cooling zone 2 and back trapping wall 4 are provided with perpendicular to reduction furnace furnace hearth level face.
The device that prevents that the high temperature direct-reduced iron from reoxidizing of the present utility model also comprises thermal technology's automatic control device; cutting valve 8, orifice-plate flowmeter 9, Hand-operated butterfly valve 10, furnace pressure quantifier 11, temperature measurement meter 12 and high-temperature industrial television 13 soon by the coal gas on the arm that is arranged on gas main 7 constitutes; be used to control reducing atmosphere, reduction reaction speed, reduced iron output and the discharging speed of described atmosphere protection and cooling zone 2; make the temperature of the reduced iron 5 in this district of process be reduced to 1100 ℃, guarantee the safe operation of annular reduction furnace 1 from 1300 ℃ of coolings.Described orifice-plate flowmeter 9 is arranged on the arm, is used to show the cooled coal gas amount that sprays into atmosphere protection and cooling zone 2.Described Hand-operated butterfly valve 10 is arranged on each gas pipe spout, is used for the demonstration according to orifice-plate flowmeter 9, and the coal gas amount that sprays into described atmosphere protection and cooling zone 2 is regulated.Described furnace pressure quantifier 11 and temperature measurement meter 12 are arranged in described atmosphere protection and the cooling zone 2; described thermal technology's automatic control device can be adjusted the furnace pressure or the furnace temperature of annular reduction furnace 1 automatically according to its observed value; when furnace pressure was higher than its nominal set(ting)value, described thermal technology's automatic control device blocked described coal gas automatically and cuts valve 8 soon.Described high-temperature industrial television 13 is arranged in described atmosphere protection and the cooling zone 2, is used for monitoring in real time the working order in this district, and the purging of its probe and heat-eliminating medium adopt reducing gas or rare gas element.
Description of drawings
Fig. 1 is the synoptic diagram that prevents the embodiment of the device that the high temperature direct-reduced iron reoxidizes of the present utility model.
Fig. 2 is the part sectioned view in the A-A cross section of Fig. 1 embodiment.
Embodiment
Below, further specify the device that prevents that the high temperature direct-reduced iron from reoxidizing of the present utility model in conjunction with the accompanying drawings.
As shown in Figure 1; atmosphere protection of the present utility model and cooling zone 2 are arranged on the zone before annular reduction furnace 1 interior close reduced iron 5 is come out of the stove; the setting of its structure and general annular reduction furnace interior region is very different; general annular reduction furnace only is provided with the water seal tightness system in the inner and outer rings of annular reduction furnace and get final product, and with the vertically disposed headwall of travel direction at the bottom of the rotary furnace less than sealing.The furnace inner space that back trapping wall 4, reduction furnace roof and the furnace bottom at the position before atmosphere protection of the present utility model and cooling zone 2 are in reduced iron 5 and are come out of the stove by a preceding trapping wall that is in high reduction zone 3, surround jointly constitutes, described before trapping wall 3, back trapping wall 4 and the mutual vertical setting of horizontal plane at the bottom of the reduction furnace.The utility model is provided with the water seal except the inner and outer rings at annular reduction furnace 1, also isolates having formed a special atmosphere protection and cooling zone 2 in reduction furnace, has realized the effect of air seal.As shown in Figure 2; described atmosphere protection and cooling zone 2 are provided with an opening in the bottom of the preceding trapping wall of setting up 3, back trapping wall 4; the height of this opening should guarantee that reduced iron 5 can pass through described atmosphere protection and cooling zone 2 smoothly; but the gas that does not allow the outside enters and does not allow to produce airborne dust; to guarantee to keep in the described cooling zone furnace pressure of reduction furnace, the controlled chilling time is for to drop to 1100 ℃ from 1300 ℃.Because special sealed structure has been adopted in cooling zone of the present utility model, guaranteed that the furnace gas of reduction furnace contacts with extraneous safety.
Below in conjunction with the accompanying drawings to the working process of cold shielding gas.
Direction in face of reduced iron 5 operation outputs; be provided with some nozzles 6 that spray into cooled coal gas in the end of annular reduction furnace 1; spray into the cooled coal gas of strong reducing property with high reducing atmosphere; the coal gas that has than strong reducing property atmosphere is tightly covered on the reduced iron 5; protect it no longer oxidized; the coal gas that sprays into cools off reduced iron 5 except the 5 not oxidations of protection reduced iron simultaneously.Because trapping wall 3 is burner hearths of high reductibility before the cooling zone, its furnace atmosphere can be enough to guarantee that reduced iron 5 does not reoxidize.
The cold shielding gas that sprays in the high temperature of annular reduction furnace 1, jumbo burner hearth is flammable very strong coal gas, guarantees that the automatic measure of control of its trouble-free service are crucial.As shown in Figure 2, cooled coal gas is provided with coal gas especially and cuts valve 8 soon from cooled coal gas house steward 7 on the arm of gas main 7; In case meet accident, automatic control system can be closed coal gas at once, guarantees the safety in the cooling zone.In order accurately to control the coal gas amount that enters the cooling zone, be provided with orifice-plate flowmeter 9 on the arm, show the instant flow and the accumulative total consumption of coal gas timely and accurately.Except on each coal powder injection tracheae, having installed the manually-operated gate, on arm, also be provided with Hand-operated butterfly valve 10, be used for the coal gas amount that sprays into the cooling zone is regulated.Also be provided with furnace pressure quantifier 11 and temperature measurement meter 12 in the cooling zone, can adjust furnace pressure and temperature automatically according to observed value, when furnace pressure exceeds set(ting)value, Controlling System can be blocked the gas inlet valve automatically, thereby prevent because furnace pressure exceeds set(ting)value, poisonous, explosive in a large number gas is overflowed, cause security incident.Technical measures of the present utility model have been done detailed test repeatedly, facts have proved it is safely and effectively.
For the situation in the Real Time Observation cooling zone, high-temperature industrial television 13 has been installed in the cooling zone specially, the purging and the heat-eliminating medium that adopt of industrial television probe here is and the diverse medium of general industry TV.Specifically, the purging and the heat-eliminating medium of industrial television probe can not be used pressurized air as the general industry stove, but with reducing gas or inert gas.
The automatic control of the thermal technology of cooling zone is included in the system of whole reduction furnace fully, and the discharging speed of speed, reduced iron output, furnace atmosphere, furnace temperature, furnace pressure and the discharging machine of the packing into of it and raw material, reduction reaction is included an integral body in and controlled.
The utility model has been put to test on the coal-based direct reduction stove; practice shows; feed in the cooling zone as protection gas and refrigerant with inflammable and explosive hypertoxic coal gas; reached the purpose that prevents that the high temperature direct-reduced iron from reoxidizing; reduced iron does not only again be oxidized, and remaining ferric oxide can proceed reduction, has improved the degree of metalization of coal-based direct reduction; and the reduced iron temperature descends, and helps discharging machine and improves the life-span.Show by environmental monitoring that simultaneously the cooled coal gas that device of the present utility model feeds inflammable and explosive severe toxicity can not bring other negative impact, started in the large-scale burner hearth safety adopt high temperature, flammable, toxic gas can effectively anti-oxidation examples of many successful.
Claims (8)
1, a kind of device that prevents that the high temperature direct-reduced iron from reoxidizing, described device is arranged in the annular reduction furnace (1), it is characterized in that:
Special atmosphere protection and cooling zone (2), be arranged on the interior zone of annular reduction furnace burner hearth near reduced iron (5) discharging, this zone is made of the furnace chamber space that a preceding trapping wall (3) that is in high reducing atmosphere district, the back trapping wall (4) that is in contiguous reduced iron (5) discharge zone, reduction furnace roof and a rotating furnace bottom surround jointly, is used to isolate the convection current of gas inside and outside the stove;
The bottom of trapping wall (3), back trapping wall (4) all has opening before described, be used to make reduced iron (5) not isolated through described atmosphere protection and cooling zone (2) smoothly, the height of described opening should keep keeping in described atmosphere protection and cooling zone (2) furnace pressure of annular reduction furnace (1), and simultaneously isolating exterior gas enters atmosphere protection and cooling zone (2) and do not produce airborne dust;
Spray into cold shielding gas to described atmosphere protection and cooling zone (2) interior device; the shielding gas that has than strong reducing property atmosphere that sprays into is tightly covered on the reduced iron (5); protect it no longer oxidized, cooling is through the temperature of the reduced iron (5) in this district simultaneously.
2, the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 1; it is characterized in that; describedly spray into cold shielding gas and be arranged on the nozzle (6) of annular reduction furnace (1) end to the device in described atmosphere protection and cooling zone (2), described nozzle (6) moves the direction setting of output in stove in face of reduced iron (5).
3, the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 1 and 2 is characterized in that, described cold shielding gas is the strong reducing property cooled coal gas with high reducing atmosphere from cooled coal gas house steward (7) input.
4, the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 1 is characterized in that, the preceding trapping wall (3) of described atmosphere protection and cooling zone (2) and back trapping wall (4) are provided with perpendicular to annular reduction furnace (1) furnace hearth level face.
5; the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 1; it is characterized in that; described device also comprises thermal technology's automatic control device; cut valve (8) soon by the coal gas on the arm that is arranged on the gas main district; orifice-plate flowmeter (9); Hand-operated butterfly valve (10); furnace pressure quantifier (11); temperature measurement meter (12) and high-temperature industrial television (13) constitute; be used to control the reducing atmosphere of described atmosphere protection and cooling zone (2); reduction reaction speed; reduced iron output and discharging speed; control is reduced to 1100 ℃ through the temperature of the reduced iron (5) in this district from 1300 ℃ of coolings, guarantees the safe operation of annular reduction furnace (1).
6, the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 5; it is characterized in that; described orifice-plate flowmeter (9) is arranged on the arm; be used for showing the cooled coal gas amount that sprays into atmosphere protection and cooling zone (2); described Hand-operated butterfly valve (10) is arranged on each gas pipe spout; be used for demonstration, the coal gas amount that sprays into described atmosphere protection and cooling zone (2) is regulated according to orifice-plate flowmeter (9).
7, the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 5; it is characterized in that; described furnace pressure quantifier (11) and temperature measurement meter (12) are arranged in described atmosphere protection and cooling zone (2); described thermal technology's automatic control device can be adjusted the furnace pressure or the furnace temperature of annular reduction furnace (1) automatically according to its observed value; when furnace pressure was higher than its nominal set(ting)value, described thermal technology's automatic control device blocked described coal gas automatically and cuts valve (8) soon.
8, the device that prevents that the high temperature direct-reduced iron from reoxidizing according to claim 5; it is characterized in that; described high-temperature industrial television (13) is arranged in described atmosphere protection and cooling zone (2); be used for monitoring in real time the working order in this district, the purging of its probe and heat-eliminating medium adopt reducing gas or rare gas element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200059679U CN201220948Y (en) | 2008-03-06 | 2008-03-06 | Apparatus for preventing high temperature directly reduced iron from being reoxidated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200059679U CN201220948Y (en) | 2008-03-06 | 2008-03-06 | Apparatus for preventing high temperature directly reduced iron from being reoxidated |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201220948Y true CN201220948Y (en) | 2009-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200059679U Expired - Lifetime CN201220948Y (en) | 2008-03-06 | 2008-03-06 | Apparatus for preventing high temperature directly reduced iron from being reoxidated |
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| Country | Link |
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| CN (1) | CN201220948Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108675298A (en) * | 2018-06-23 | 2018-10-19 | 石嘴山市华兴源机械设备有限公司 | Ring type calcium carbide production crushing all-in-one machine |
| CN112981029A (en) * | 2021-01-29 | 2021-06-18 | 钢铁研究总院 | Gas-based reduction device and method for simulating gas-based reduction |
-
2008
- 2008-03-06 CN CNU2008200059679U patent/CN201220948Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108675298A (en) * | 2018-06-23 | 2018-10-19 | 石嘴山市华兴源机械设备有限公司 | Ring type calcium carbide production crushing all-in-one machine |
| CN108675298B (en) * | 2018-06-23 | 2024-01-12 | 石嘴山市华兴源机械设备有限公司 | Ring type calcium carbide discharging and crushing integrated machine |
| CN112981029A (en) * | 2021-01-29 | 2021-06-18 | 钢铁研究总院 | Gas-based reduction device and method for simulating gas-based reduction |
| CN112981029B (en) * | 2021-01-29 | 2022-05-13 | 钢铁研究总院 | Gas-based reduction device and method for simulating gas-based reduction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SICHUAN LOMON MINING + METALLURGY CO., LTD. Free format text: FORMER OWNER: SICHUAN LOMON GROUP CO., LTD. Effective date: 20091030 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20091030 Address after: Anning Industrial Park, Sichuan city of Panzhihua province Yanbian County zip code: 617100 Patentee after: Sichuan Lomon Mining & Metallurgy Co., Ltd. Address before: Sichuan city of Mianzhu Province Lu Xuan longmang group, zip code: 618200 Patentee before: Longmang Group Co., Ltd., Sichuan Prov |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090415 |