CN203274527U - High-temperature exhaust gas waste heat utilizing system of continuous casting and rolling machine set pit furnace - Google Patents
High-temperature exhaust gas waste heat utilizing system of continuous casting and rolling machine set pit furnace Download PDFInfo
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- CN203274527U CN203274527U CN2013202653450U CN201320265345U CN203274527U CN 203274527 U CN203274527 U CN 203274527U CN 2013202653450 U CN2013202653450 U CN 2013202653450U CN 201320265345 U CN201320265345 U CN 201320265345U CN 203274527 U CN203274527 U CN 203274527U
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- heat exchanger
- combustion air
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- soaking pit
- roll
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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
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Abstract
The utility model discloses a high-temperature exhaust gas waste heat utilizing system of a continuous casting and rolling machine set pit furnace. A main pipeline is sequentially provided with a combustion air heat exchanger, a gas heat exchanger and a roller heat exchanger, wherein the combustion air heat exchanger is used for heating combustion air, the gas heat exchanger is used for heating gas, and the roller heat exchanger is used for heating a roller. The heat exchanging air inlet end and the heat exchanging air outlet end of the combustion air heat exchanger are communicated with a combustion air draught fan set and the pit furnace respectively. The heat exchanging air inlet end and the heat exchanging air outlet end of the gas heat exchanger are communicated with the gas and the pit furnace respectively. The heat exchanging air inlet end and the heat exchanging air outlet end of the roller heat exchanger are connected with an air draught fan and a roller heating area respectively. The combustion air and the indoor gas are heated by recycling the heat of the high-temperature waste heat of the pit furnace, the combustion efficiency of the fuel of the pit furnace is effectively improved, and the usage amount of the fuel is saved. The roller to be fed to a rolling mill is heated by utilizing the heat of the high-temperature waste gas, the roller breakage can be avoided, the frequency of rolling a hot roller is reduced, the rolling efficiency of the rolling mill is improved, and a large amount of production cost is saved.
Description
Technical field
The utility model belongs to high-temp waste gas UTILIZATION OF VESIDUAL HEAT IN field, refers to particularly a kind of continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system.
Background technology
Continuous casting and rolling full name continuous casting continuous rolling is liquid steel to be poured into roll out slab (calling continuous casting billet) in conticaster, then without cooling, directly enters the iron and steel rolling mill practice of roll forming in continuous hot-rolling mill after the insulation certain hour in soaking pit.
Soaking pit is located between conticaster and continuous hot-rolling mill, and it mainly possesses three large functions: 1, the heating of slab and soakage function, receive continuously the high temperature slab that conticaster is produced, and in time supply with the sheet billet that continuous hot-rolling mill satisfies quality requirement after heating and soaking; 2, pooling feature, produce when continuous hot-rolling mill is normal the roller that changes jobs, or the upstream device temporary derangement can not rolled slab the time soaking pit still can receive slab within the regular hour, rise and regulate cushioning effect, namely " flexibility " of stove buffering link at the bottom of having increased roller between " rigidity " conticaster and continuous hot-rolling mill, carry out the continuous casting and rolling technology artistic skill smoothly; 3, regulate the rhythm of production of conticaster and continuous hot-rolling mill.
EGT after the soaking pit internal combustion 500 ℃ of left and right, at this moment reclaims the cost performance that is used for producing steam very low through EGT after heat recovery up to thousands of degrees centigrade again, therefore, generally all directly enters atmosphere by chimney.Meanwhile, winter, the temperature of roll of continuous hot-rolling mill was very low, and the temperature of slab is up to more than 800 degree, if the accidents such as fracture of roller can occur in cold rolling system, have a strong impact on production, the merchantable timber processed so reroll after needing rolling a large amount of hot rolling material that roller temperature is raise on cold roller after machine has improved production cost.
Summary of the invention
The purpose of this utility model is exactly will be for the existing problem of prior art, a kind of continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system is provided, utilize the heat of soaking pit high-temp waste gas to heat the temperature of roll before combustion air, cooled coal gas and upper machine, thereby reduce the use amount of coal gas, improve efficiency of combustion, reduce the rolling of hot rolling material, improve the milling train operating efficiency.
for achieving the above object, the continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system that the utility model is designed, comprise soaking pit, the trunk line of chimney and connection soaking pit and chimney, set gradually the combustion air heat exchanger that is useful on the heating combustion air on described trunk line, be used for the gas change heater of heating gas and be used for the roll heat exchanger of heated roll, the heat exchange inlet end of described combustion air heat exchanger is provided with combustion air blower fan group, the heat exchange outlet side of described combustion air heat exchanger is communicated with soaking pit, the heat exchange inlet end of described gas change heater is communicated with coal gas, the heat exchange outlet side of described gas change heater is communicated with soaking pit, the heat exchange inlet end of described roll heat exchanger is provided with air blower, the heat exchange outlet side of described roll heat exchanger is provided with the roll thermal treatment zone.
In such scheme, be provided with the trunk line ratio adjusting valve between the port of export of described trunk line and chimney.Like this, by proportion of installation control valve, adjust furnace pressure that its aperture makes soaking pit and be stabilized in technique and need in scope.
In such scheme, be provided with the combustion air bypass channel that is communicated with soaking pit on described combustion air heat exchanger and passage that combustion air blower fan group is connected, be provided with combustion air bypass ratio adjusting valve on described combustion air bypass channel.Be provided with the coal gas bypass channel that is communicated with soaking pit on described gas change heater and passage that coal gas is connected, be provided with coal gas bypass ratio adjusting valve on described coal gas bypass channel.
Like this, proportion of installation control valve all on the bypass channel of combustion air and coal gas by the aperture of resize ratio control valve, can be controlled the combustion air that enters soaking pit and the temperature of coal gas, and then can control temperature and the furnace gas composition of soaking pit, satisfy different technological requirements.In addition, combustion air heat exchanger and gas change heater have corresponding bypass, in case heat exchanger breaks down in the time of need to safeguarding, combustion air and coal gas can continue to provide the raw material of burning to soaking pit by bypass, avoid affecting unit and normally produce.
In such scheme, be provided with roll heating bypass channel on the passage of described roll heat exchanger and air blower, be provided with roll heating bypass ratio control valve on described roll heating bypass channel.Like this, proportion of installation control valve in the bypass of roll heat exchanger, when the EGT of trunk line changed, by the aperture adjustment of this proportion valve, the air themperature that can guarantee to be input to the roll thermal treatment zone was stabilized in design temperature.
In such scheme, the heat exchange inlet end of described combustion air heat exchanger, gas change heater and roll heat exchanger and heat exchange outlet side are provided with block valve.
The beneficial effects of the utility model are: by reclaiming the heat of soaking pit high-temp waste gas, heat combustion air and room temperature coal gas, effectively improve the efficiency of combustion of soaking pit fuel, the use amount of fuel saving.Simultaneously, utilize the heat of high-temp waste gas to heat the roll that namely will go up milling train, can avoid the generation of roll breakage accident, reduce the rolling of hot rolling material, improve the rolling efficiency of milling train, save a large amount of production costs.And heated roll has been avoided the use of the conventional energy resources such as electrical heating, only utilizes the waste-heat of waste gas, does not need fuel cost.
Description of drawings
Fig. 1 is the flow chart of continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system of the present utility model.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system shown in Figure 1 comprises soaking pit 1, chimney 3 and is communicated with the trunk line 10 of soaking pit 1 and chimney 3.Also be provided with trunk line ratio adjusting valve 13 between the port of export of trunk line 10 and chimney 3.Set gradually combustion air heat exchanger 2, the gas change heater 6 that is used for heating gas that is useful on the heating combustion air and the roll heat exchanger 9 that is used for heated roll on trunk line 10.
The heat exchange inlet end of combustion air heat exchanger 2 is provided with combustion air blower fan group 4, and the heat exchange outlet side of combustion air heat exchanger 2 is communicated with soaking pit 1.Be provided with combustion air bypass channel 14 on combustion air heat exchanger 2 and passage that combustion air blower fan group 4 is connected, be provided with combustion air bypass ratio adjusting valve 5 on combustion air bypass channel 14.Combustion air bypass channel 14 is communicated with soaking pit 1, also is provided with corresponding bypass flue and Flue valve on combustion air bypass channel 14.
The heat exchange inlet end of gas change heater 6 is communicated with coal gas, and the heat exchange outlet side of gas change heater 6 is communicated with soaking pit 1.Be provided with coal gas bypass channel 15 on gas change heater 6 and passage that coal gas is connected, be provided with coal gas bypass ratio adjusting valve 8 on coal gas bypass channel 15.Coal gas bypass channel 15 is communicated with soaking pit 1, also is provided with corresponding bypass flue and Flue valve on coal gas bypass channel 15.
The heat exchange inlet end of roll heat exchanger 9 is provided with air blower 11, and the heat exchange outlet side of roll heat exchanger 9 is provided with the roll thermal treatment zone 7.Be provided with roll heating bypass channel 16 on the passage of roll heat exchanger 9 and air blower 11, be provided with roll heating bypass ratio control valve 12 on roll heating bypass channel 16.
The heat exchange inlet end of combustion air heat exchanger 2, gas change heater 6 and roll heat exchanger 9 and heat exchange outlet side are provided with block valve 17.
The course of work of the present utility model:
In the soaking pit internal combustion, in stove, temperature is up to 1100 ℃ as raw material for coal gas and combustion air mixing, and the high-temp waste gas of generation is introduced into combustion air heat exchanger 2 by trunk line 10, and its entrance high-temp waste gas temperature is 840 ℃ of left and right.Combustion air blower fan group 4 is blown into combustion air heat exchanger 2 to air at room temperature, after obtaining the combustion air of 400 ℃ of temperature through heat exchange, gets back to soaking pit 1 by pipeline and uses as the high temperature combustion air.Duration of work can be adjusted by adjusting combustion air bypass ratio adjusting valve 5 temperature of combustion air.If combustion air heat exchanger 2 breaks down, can close the block valve 17 of combustion air heat exchanger 2, after combustion air bypass ratio adjusting valve 5 is opened fully, combustion air heat exchanger 2 is keeped in repair.
Continue to enter gas change heater 6 for heating gas provides thermal source by trunk line 10 through the high-temp waste gas after combustion air heat exchanger 2, room temperature coal gas reaches more than 200 ℃ through temperature after heat exchange, gets back to soaking pit 1 as the fuel use of soaking pit 1 by pipeline.Duration of work also can be controlled by coal gas bypass ratio adjusting valve 8 temperature of coal gas.Gas change heater 6 breaks down, and can close the block valve 17 of gas change heater 6, after coal gas bypass ratio adjusting valve 8 is opened fully, gas change heater 6 is keeped in repair.
And, in maintenance process, can also utilize combustion air bypass channel 14 and coal gas bypass channel 15, combustion air and coal gas can continue to provide the raw material of burning to soaking pit 1 by bypass, avoid affecting unit and normally produce.
Through the high-temp waste gas after gas change heater 6 at this moment temperature 480 ℃ of left and right, continuation enters roll heat exchanger 9 by trunk line 10 and provides thermal source for heated roll, by air blower 11, air being blown into roll heat exchanger 9 heats, after after heat exchange, air themperature reaches design temperature, by pipe network, hot-air is transported to the roll thermal treatment zone 7 breaker rolls and heats, the temperature of hot-air is controlled by adjusting roll heating bypass ratio control valve 12.Roll heat exchanger 9 breaks down, and can close the block valve 17 of roll heat exchanger 9, and after roll heating bypass ratio control valve 12 was opened fully, breaker roll heat exchanger 9 keeped in repair.
At last, the high-temp waste gas of trunk line is discharged by chimney 3, and the pressure of trunk line 10 and soaking pit 1 is regulated by trunk line ratio adjusting valve 13, guarantees that technique needs.
Because combustion air temperature, gas temperature, the air themperature of roll heating and the furnace pressure of soaking pit can effectively be controlled, guaranteed the stability of production technology.
Claims (6)
1. continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system, comprise soaking pit (1), the trunk line (10) of chimney (3) and connection soaking pit (1) and chimney (3), it is characterized in that: set gradually the combustion air heat exchanger (2) that is useful on the heating combustion air on described trunk line (10), be used for the gas change heater (6) of heating gas and be used for the roll heat exchanger (9) of heated roll, the heat exchange inlet end of described combustion air heat exchanger (2) is provided with combustion air blower fan group (4), the heat exchange outlet side of described combustion air heat exchanger (2) is communicated with soaking pit (1), the heat exchange inlet end of described gas change heater (6) is communicated with coal gas, the heat exchange outlet side of described gas change heater (6) is communicated with soaking pit (1), the heat exchange inlet end of described roll heat exchanger (9) is provided with air blower (11), the heat exchange outlet side of described roll heat exchanger (9) is provided with the roll thermal treatment zone (7).
2. continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system according to claim 1, is characterized in that: be provided with trunk line ratio adjusting valve (13) between the port of export of described trunk line (10) and chimney (3).
3. continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system according to claim 1, it is characterized in that: be provided with the combustion air bypass channel (14) that is communicated with soaking pit (1) on described combustion air heat exchanger (2) and passage that combustion air blower fan group (4) is connected, be provided with combustion air bypass ratio adjusting valve (5) on described combustion air bypass channel (14).
4. continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system according to claim 1, it is characterized in that: be provided with the coal gas bypass channel (15) that is communicated with soaking pit (1) on described gas change heater (6) and passage that coal gas is connected, be provided with coal gas bypass ratio adjusting valve (8) on described coal gas bypass channel (15).
5. continuous casting and rolling unit soaking pit high-temp waste gas bootstrap system according to claim 1, it is characterized in that: be provided with roll heating bypass channel (16) on the passage of described roll heat exchanger (9) and air blower (11), be provided with roll heating bypass ratio control valve (12) on described roll heating bypass channel (16).
6. one of according to claim 1 ~ 5 described continuous casting and rolling unit soaking pit high-temp waste gas bootstrap systems is characterized in that: the heat exchange inlet end of described combustion air heat exchanger (2), gas change heater (6) and roll heat exchanger (9) and heat exchange outlet side are provided with block valve (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202653450U CN203274527U (en) | 2013-05-15 | 2013-05-15 | High-temperature exhaust gas waste heat utilizing system of continuous casting and rolling machine set pit furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202653450U CN203274527U (en) | 2013-05-15 | 2013-05-15 | High-temperature exhaust gas waste heat utilizing system of continuous casting and rolling machine set pit furnace |
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| CN203274527U true CN203274527U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013202653450U Expired - Fee Related CN203274527U (en) | 2013-05-15 | 2013-05-15 | High-temperature exhaust gas waste heat utilizing system of continuous casting and rolling machine set pit furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103934270A (en) * | 2014-05-08 | 2014-07-23 | 武汉钢铁(集团)公司 | Roller off-line preheating system for continuous casting and rolling production line |
| CN114593612A (en) * | 2022-01-26 | 2022-06-07 | 何荣志 | High-efficient recovery system of stove low temperature waste heat |
-
2013
- 2013-05-15 CN CN2013202653450U patent/CN203274527U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103934270A (en) * | 2014-05-08 | 2014-07-23 | 武汉钢铁(集团)公司 | Roller off-line preheating system for continuous casting and rolling production line |
| CN114593612A (en) * | 2022-01-26 | 2022-06-07 | 何荣志 | High-efficient recovery system of stove low temperature waste heat |
| CN114593612B (en) * | 2022-01-26 | 2024-01-23 | 何荣志 | High-efficient recovery system of kiln low temperature waste heat |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170714 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Patentee before: Wuhan Iron & Steel (Group) Corp. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20180515 |