CN112813250A - Water-cooled temperature control device and method for furnace top roller chamber of direct-fired furnace - Google Patents
Water-cooled temperature control device and method for furnace top roller chamber of direct-fired furnace Download PDFInfo
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- CN112813250A CN112813250A CN202110001658.4A CN202110001658A CN112813250A CN 112813250 A CN112813250 A CN 112813250A CN 202110001658 A CN202110001658 A CN 202110001658A CN 112813250 A CN112813250 A CN 112813250A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 239000007789 gas Substances 0.000 claims description 34
- 239000002912 waste gas Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5735—Details
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a water-cooled temperature control device and a method for a furnace top roller chamber of a direct-fired furnace, wherein the device comprises a variable-frequency circulating fan, a water-cooled heat exchanger and a circulating cooling air pipe, the circulating cooling air pipe is respectively connected with two sides of the furnace top roller chamber through an air suction opening and an air supply opening, so that the circulating cooling air pipe and the furnace top roller chamber form a closed gas circulation structure, the middle part of the circulating cooling air pipe is also sequentially connected with the variable-frequency circulating fan and the water-cooled heat exchanger, the bottom of the water-cooled heat exchanger is connected with a drain pipe, and an air quantity distributor is arranged in the outlet direction of strip steel in the furnace top roller chamber. The invention has simple structure and convenient operation, can effectively reduce the temperature of the furnace top roller chamber of the direct-fired furnace and achieve the purpose of controllable temperature, greatly prolongs the service life of the second steering roller and the third steering roller in the furnace top roller chamber, solves the problem of deviation of strip steel in the furnace top roller chamber of the direct-fired furnace, and has the advantage of small floor area.
Description
Technical Field
The invention belongs to the technical field of strip steel continuous annealing, and particularly relates to a water-cooled temperature control device and a water-cooled temperature control method for a furnace top roller chamber of a direct-fired furnace.
Background
At present, in the field of continuous heat treatment of strip steel, direct-fire heating has the advantages of small occupied area, high heating speed and the like, and is applied on a large scale once. However, with the increase of the proportion of automobile plates and the increase of the requirements on the surface of strip steel, the further popularization and application of direct-fired heating are limited. This is because the direct-fired combustion exhaust gas directly contacts the strip steel, and natural gas or liquefied petroleum gas is required as a fuel to obtain good surface quality of the strip steel. However, natural gas or liquefied petroleum gas resources in China are insufficient, so that the application of direct-fire heating in the field of continuous heat treatment of strip steel is limited. However, in recent years, high-strength steel, especially ultra-high-strength steel, has been popularized and applied in large scale in the fields of automobiles and the like, and the advantages of direct-fire heating in the production of ultra-high-strength steel are very obvious: firstly, the heating speed is high, the strip steel can be heated to more than 600 ℃ by one pass, and the deviation risk of the strip steel in the vertical annealing furnace is greatly reduced; secondly, the direct-fired heating can realize a pre-oxidation reduction process through air-fuel ratio adjustment, improve the platability of the ultrahigh-strength steel, and obviously accelerate the popularization and application speed of the direct-fired heating technology in recent years due to the increase of natural gas resources and the improvement of artificial natural gas technology in China.
As shown in fig. 1, in the prior art, a strip steel 1 is turned by a first turning roll 2 in front of a direct-fired furnace, enters a direct-fired waste gas preheating furnace 4 from a sealing device 3 for preheating, then enters a furnace top roll chamber 5 from the direct-fired waste gas preheating furnace 4, is turned by a second turning roll 6 and a third turning roll 7 in the furnace top roll chamber, enters a direct-fired furnace 9, is heated by a plurality of direct-fired heating zones 11 in the direct-fired furnace 9, and then is turned by a fourth turning roll 10 at the outlet side of the direct-fired furnace 9 to continue to run backwards.
The direct-fired waste gas preheating furnace 4 is connected with a chimney 23 through a waste heat boiler 21 and can recycle residual heat, and a waste gas fan 22 and a waste gas air quantity regulating valve 24 are arranged between the waste heat boiler 21 and the chimney 23, so that the pressure in the direct-fired furnace 9 has controllability.
The temperature of the furnace top roller chamber 5 is very critical and cannot be too high (namely cannot be higher than 600 ℃), otherwise the thermal expansion amount of the second steering roller 6 and the third steering roller 7 is large, and after the low-temperature strip steel 1 contacts the high-temperature second steering roller 6 and the high-temperature third steering roller 7, the part of the second steering roller 6 and the third steering roller 7 contacting the strip steel 1 can generate negative convexity, so that the strip steel 1 deviates in the furnace top roller chamber 5, and the stable operation of a unit is influenced. In order to reduce the internal temperature of the top roller housing 5, conventionally, a throat 8 is provided between the direct-fired exhaust gas preheating furnace 4 and the top roller housing 5 and between the direct-fired furnace 9 and the top roller housing 5, for limiting the amount of direct-fired combustion exhaust gas entering the top roller housing 5, thereby reducing the temperature of the top roller housing 5. In addition, a waste gas communicating pipeline 12 is further arranged below the furnace throat 8, two ends of the waste gas communicating pipeline 12 are respectively connected with the tops of the direct-fired furnace 9 and the direct-fired waste gas preheating furnace 4 and are communicated with each other, combustion waste gas in the direct-fired furnace 9 directly enters the direct-fired waste gas preheating furnace 4 through a short circuit of the waste gas communicating pipeline 12, a large amount of combustion waste gas in the direct-fired furnace 9 is prevented from entering the furnace top roller chamber 5, and therefore the temperature of the furnace top roller chamber 5 can be greatly reduced.
In order to solve the deviation problem of the strip steel 1 of the furnace top roller chamber 5 and prolong the service life of the second steering roller 6 and the third steering roller 7, the water-cooling sealing roller is arranged in the furnace throat 8 to achieve the purpose of reducing the temperature of the furnace top roller chamber 5, but because the temperature of the furnace throat 8 is higher, particularly the temperature of the furnace throat 8 at the top of the direct-fired furnace 9 is very high, the water-cooling sealing roller is easy to bend, leak and the like, the service life of the water-cooling sealing roller is shortened, the water-cooling sealing roller needs to be frequently replaced, and the effective operation efficiency of a unit can be influenced.
Disclosure of Invention
The invention aims to provide a water-cooled temperature control device for a furnace top roller chamber of a direct-fired furnace and a method thereof, which have the advantages of simple structure and convenient operation, can effectively reduce the temperature of the furnace top roller chamber of the direct-fired furnace and achieve the purpose of controllability, greatly prolongs the service life of a second steering roller and a third steering roller in the furnace top roller chamber, solves the problem of deviation of strip steel in the furnace top roller chamber of the direct-fired furnace, has the advantage of small floor area, does not need to arrange a water-cooled sealing roller in a furnace throat, and avoids the reduction of the unit operation rate caused by the related maintenance and replacement of the water-cooled sealing roller.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the utility model provides a water-cooled temperature control device for straight fire stove furnace roof roller chamber, includes inverter type circulating fan, water-cooled heat exchanger and circulative cooling tuber pipe, the circulative cooling tuber pipe passes through inlet scoop and supply-air outlet and is connected with the both sides of furnace roof roller chamber respectively for circulative cooling tuber pipe and furnace roof roller chamber form a closed gas circulation structure, the middle part of circulative cooling tuber pipe still connect gradually inverter type circulating fan and water-cooled heat exchanger, the bottom of water-cooled heat exchanger is connected with the drain pipe, the exit direction of the indoor belted steel of furnace roof roller is provided with air distributor.
The water-cooled heat exchanger is connected with a cooling circulating water system through a water-cooled pipe.
The air distributor is positioned above the furnace throat.
And a strip steel inlet area thermometer is arranged in a strip steel inlet area in the furnace top roller chamber, and a strip steel outlet area thermometer is arranged in a strip steel outlet area in the furnace top roller chamber.
And the outlet of the variable-frequency circulating fan is also provided with a variable-frequency circulating fan outlet thermometer, and the outer side of the furnace top roller chamber is provided with a temperature controller respectively connected with the variable-frequency circulating fan and the variable-frequency circulating fan outlet thermometer.
The end part of the air supply outlet extends into the interior of the furnace top roller chamber and is connected with the air quantity distributor.
The circulating cooling air pipe is made of stainless steel.
A water-cooled temperature control method for a roller chamber at the top of a direct-fired furnace adopts the water-cooled temperature control device, and comprises the following steps:
s1, extracting gas entering a furnace top roller chamber from a direct fire furnace through a variable frequency circulating fan, cooling the gas through a water-cooled heat exchanger, and returning the cooled gas to the furnace top roller chamber to reduce the temperature inside the furnace top roller chamber;
s2, timely removing condensed water condensed and dripped on the surface of the water-cooled heat exchanger through a bottom water drainage pipe of the water-cooled heat exchanger;
s3, connecting the water-cooled heat exchanger with a cooling circulating water system through a water-cooled pipe to cool the cooling water circulating in the water-cooled heat exchanger;
s4, the air quantity is obliquely downward through an air outlet of the air quantity distributor, the quantity of waste gas entering a furnace top roller chamber from waste gas in a direct fire furnace is reduced in a pressing mode, the air quantity of the air quantity distributor is symmetrically blown to the upper part of a furnace throat from the upper surface and the lower surface of the strip steel, the impact force of circulating gas on the strip steel is reduced, and the strip steel in the furnace top roller chamber is prevented from shaking or shaking;
s5, measuring the internal temperature of the furnace top roller chamber through a strip steel inlet area thermometer and a strip steel outlet area thermometer;
and S6, measuring the temperature of the outlet circulating gas of the variable-frequency circulating fan in real time through the outlet thermometer of the variable-frequency circulating fan, and controlling the internal temperature of the furnace top roller chamber by adjusting the rotating speed of the variable-frequency circulating fan through the temperature controller according to the deviation between the temperature measurement result of the outlet thermometer of the variable-frequency circulating fan and the set target temperature of the circulating gas.
The invention has the beneficial effects that:
(1) the invention has small occupied area;
(2) the temperature of the furnace top roller chamber can be controlled below 600 ℃, and the deviation of strip steel in the region of the furnace top roller chamber is avoided;
(2) the water-cooling sealing roller with high failure rate is not needed, and the service lives of the second steering roller and the third steering roller can be prolonged;
(3) the circulating gas is sent back to the furnace top roller chamber through the air volume distributors which are symmetrically arranged, so that the impact force of the circulating gas on the strip steel can be reduced, and the strip steel in the direct-fired furnace is prevented from shaking;
(4) the circulating cooling air pipe is made of stainless steel, so that the phenomenon that moisture and impurity combustion products in direct-fired combustion waste gas corrode the air pipe, the corrosion products pollute a hearth, and quality accidents are caused is avoided.
Drawings
FIG. 1 is a schematic view of a direct-fired furnace according to the prior art;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a schematic view of a combination structure of the present invention and a conventional direct-fired furnace.
In the figure: 1, strip steel; 2 a first steering roller; 3, sealing the device; 4, preheating the waste gas by direct fire; 5 furnace top roller chamber; 6 a second turning roll; 7 a third turning roll; 8, furnace throat; 9, a direct-fired furnace; 10 a fourth turning roll; 11 direct fire heating zone; 12 is communicated with a pipeline; 21, a waste heat boiler; 22 an exhaust gas fan; 23, a chimney; 24 waste gas air volume adjusting valve; 31 variable frequency circulating fan; 32 water-cooled heat exchanger; 33 cooling the circulating water system; 34 circulating cooling air pipes; 35 water-cooling pipes; 36 air flow distributor; 37 drain pipe; 38 strip inlet area thermometer; 39 strip exit region thermometer; 40, an outlet thermometer of the variable-frequency circulating fan; 41 temperature controller.
Detailed Description
The following examples are presented to further illustrate the practice of the invention: it should be noted that, by applying the idea of the present invention, various embodiments can be evolved, and this embodiment only presents one embodiment, and various schemes evolved according to the idea of the present invention are within the protection scope of the present invention.
As shown in fig. 2 and 3, the water-cooled temperature control device for the furnace top roller chamber of the direct-fired furnace comprises a variable-frequency circulating fan 31, a water-cooled heat exchanger 32 and a circulating cooling air pipe 34, wherein the circulating cooling air pipe 34 is respectively connected with two sides of the furnace top roller chamber 5 through an air suction opening and an air supply opening, so that the circulating cooling air pipe 34 and the furnace top roller chamber 5 form a closed gas circulation structure, the middle part of the circulating cooling air pipe 34 is also sequentially connected with the variable-frequency circulating fan 31 and the water-cooled heat exchanger 32, the bottom of the water-cooled heat exchanger 32 is connected with a drain pipe 37, and an air distributor 36 is arranged in the outlet direction of the strip steel 1 in the furnace top roller chamber.
The water-cooled heat exchanger 32 is connected to a cooling circulation water system 33 through a water-cooled pipe 35.
The air distributor 36 is located above the furnace throat 8.
A strip inlet area thermometer 38 is provided in the strip inlet area in the furnace top roller chamber 5, and a strip outlet area thermometer 39 is provided in the strip outlet area in the furnace top roller chamber 5.
The outlet of the variable-frequency circulating fan 31 is also provided with a variable-frequency circulating fan outlet thermometer 40, and the outer side of the furnace top roller chamber 5 is provided with a temperature controller 41 respectively connected with the variable-frequency circulating fan 31 and the variable-frequency circulating fan outlet thermometer 40.
The end of the air supply opening extends into the interior of the furnace top roller chamber 5 and is connected with an air flow distributor 36.
The circulating cooling air pipe 34 is made of stainless steel.
A water-cooled temperature control method for a roller chamber at the top of a direct-fired furnace adopts the water-cooled temperature control device, and comprises the following steps:
s1, extracting gas entering a furnace top roller chamber 5 from a direct fire furnace 9 through a variable frequency circulating fan 31, cooling the gas through a water-cooled heat exchanger 32, and returning the cooled gas to the furnace top roller chamber 5 to reduce the temperature in the furnace top roller chamber 5;
s2, timely discharging condensed water condensed and dropped on the surface of the water-cooled heat exchanger 32 through a bottom water discharge pipe 37 of the water-cooled heat exchanger 32;
s3, connecting the water-cooled heat exchanger 32 with a cooling circulating water system 33 through a water-cooled pipe 35 to cool the cooling water circulating in the water-cooled heat exchanger;
s4, the air quantity is obliquely downward through an air outlet of the air quantity distributor 36, the quantity of waste gas entering the furnace top roller chamber 5 from waste gas in the direct-fired furnace 9 is reduced in a pressing mode, the air quantity of the air quantity distributor 36 is symmetrically blown to the upper side of the furnace throat 8 from the upper surface and the lower surface of the strip steel 1, the impact force of circulating gas on the strip steel 1 is reduced, and the strip steel 1 in the furnace top roller chamber 5 is prevented from shaking or shaking;
s5, measuring the internal temperature of the furnace top roller chamber 5 through a strip steel inlet area thermometer 38 and a strip steel outlet area thermometer 39;
s6, measuring the temperature of the outlet circulating gas of the variable-frequency circulating fan 31 in real time through the outlet thermometer 40 of the variable-frequency circulating fan, and controlling the internal temperature of the furnace top roller chamber 5 by adjusting the rotating speed of the variable-frequency circulating fan 31 through the temperature controller 41 according to the deviation between the temperature measurement result of the outlet thermometer 40 of the variable-frequency circulating fan and the set target temperature of the circulating gas through the temperature controller 41.
The working principle of the invention is as follows: as shown in fig. 2 and 3, the strip steel 1 turns by a first turning roll 2 in front of the direct-fired furnace, enters a direct-fired waste gas preheating furnace 4 for preheating, then enters a furnace top roll chamber 5 from the direct-fired waste gas preheating furnace 4, turns by a second turning roll 6 and a third turning roll 7 in the furnace top roll chamber, enters a direct-fired furnace 9, is heated by a plurality of direct-fired heating zones 11 in the direct-fired furnace 9, turns by a fourth turning roll 10 outside an outlet of the direct-fired furnace 9, and then continues to run backwards.
The variable-frequency circulating fan 31 and the water-cooled heat exchanger 32 are arranged outside the furnace top roller chamber 5, the variable-frequency circulating fan 31 and the water-cooled heat exchanger 32 are connected through the circulating cooling air pipe 34, the variable-frequency circulating fan 31 extracts gas entering the direct-fired furnace 9 from the furnace top roller chamber 5, the gas is cooled by the water-cooled heat exchanger 32 and then is sent into the furnace top roller chamber 5, the purpose of reducing the temperature of the furnace top roller chamber is achieved, the drain pipe 37 is arranged at the bottom of the water-cooled heat exchanger 32 and used for timely removing condensed water dropping from the surface of the water-cooled heat exchanger 32, because the direct-fired combustion waste gas contains a large amount of water and gas, the water can be condensed when meeting the surface of the low-temperature water-cooled heat exchanger 32, and if the condensed water cannot be removed in. The water-cooled heat exchanger 32 is connected with a cooling circulating water system 33 through a water-cooled pipe 35, and is used for cooling the cooling water circulating in the water-cooled heat exchanger. An air flow distributor 36 is arranged above the furnace throat 8 in the strip steel outlet direction in the furnace top roller chamber 5, an air outlet of the air flow distributor is blown to the upper side of the furnace throat 8 from the upper surface and the lower surface of the strip steel 1 in an inclined downward mode, the air flow distributor is used for pressing the amount of waste gas entering the furnace top roller chamber 5 from the waste gas in the direct-fired furnace 9, the impact force of circulating gas on the strip steel 1 can be reduced, the shaking or shaking of the strip steel 1 in the direct-fired furnace 9 is reduced, the air flow distributor 36 is the prior art, and the description is.
In this embodiment, a strip inlet area thermometer 38 is further provided in the strip inlet area of the furnace top roller chamber, and a strip outlet area thermometer 39 is provided in the strip outlet area of the furnace top roller chamber, for measuring the internal temperature of the furnace top roller chamber 5 for real-time monitoring. In addition, in this embodiment, an outlet thermometer 40 for an inverter type circulation fan is further provided at the outlet of the inverter type circulation fan 31 for measuring the temperature of the circulation gas at the outlet of the inverter type circulation fan in real time, and a temperature controller 41 is provided outside the top roller chamber 5, and the temperature controller 41 controls the internal temperature of the top roller chamber 5 by adjusting the rotation speed of the inverter type circulation fan 31 based on the deviation between the temperature measurement result of the outlet thermometer 40 for the inverter type circulation fan and the set target temperature of the circulation gas. In this embodiment, circulative cooling tuber pipe 34 adopts stainless steel, avoids moisture and impurity combustion product among the direct fire combustion exhaust gas to corrode the tuber pipe, causes the corrosion product to pollute furnace, arouses the quality accident.
The method can solve the problem of deviation of the strip steel in the roller chamber area at the top of the direct-fired furnace, is very beneficial to producing high-strength steel and ultrahigh-strength steel products such as DP steel, QP steel, CP steel, TRIP steel and the like, and has very wide application prospect along with popularization and application of producing the high-strength steel and the ultrahigh-strength steel by adopting the direct-fired furnace.
Claims (8)
1. The utility model provides a water-cooled temperature control device for roller chamber at the top of a straight-burning furnace which characterized in that: including inverter type circulating fan, water-cooled heat exchanger and circulative cooling tuber pipe, the circulative cooling tuber pipe passes through inlet scoop and supply-air outlet and is connected with the both sides of furnace roof roller chamber respectively for the circulative cooling tuber pipe forms a closed gas circulation structure with furnace roof roller chamber, the middle part of circulative cooling tuber pipe still connected gradually inverter type circulating fan and water-cooled heat exchanger, the bottom of water-cooled heat exchanger is connected with the drain pipe, the export direction of the indoor belted steel of furnace roof roller is provided with air distributor.
2. The water-cooled temperature control device according to claim 1, wherein: the water-cooled heat exchanger is connected with a cooling circulating water system through a water-cooled pipe.
3. The water-cooled temperature control device according to claim 1, wherein: the air distributor is positioned above the furnace throat.
4. The water-cooled temperature control device according to claim 1, wherein: and a strip steel inlet area thermometer is arranged in a strip steel inlet area in the furnace top roller chamber, and a strip steel outlet area thermometer is arranged in a strip steel outlet area in the furnace top roller chamber.
5. The water-cooled temperature control device according to claim 1, wherein: and the outlet of the variable-frequency circulating fan is also provided with a variable-frequency circulating fan outlet thermometer, and the outer side of the furnace top roller chamber is provided with a temperature controller respectively connected with the variable-frequency circulating fan and the variable-frequency circulating fan outlet thermometer.
6. The water-cooled temperature control device according to claim 1, wherein: the end part of the air supply outlet extends into the interior of the furnace top roller chamber and is connected with the air quantity distributor.
7. The water-cooled temperature control device according to claim 1, wherein: the circulating cooling air pipe is made of stainless steel.
8. A water-cooled temperature control method for a roller chamber at the top of a direct-fired furnace, which employs the water-cooled temperature control device according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, extracting gas entering a furnace top roller chamber from a direct fire furnace through a variable frequency circulating fan, cooling the gas through a water-cooled heat exchanger, and returning the cooled gas to the furnace top roller chamber to reduce the temperature inside the furnace top roller chamber;
s2, timely removing condensed water condensed and dripped on the surface of the water-cooled heat exchanger through a bottom water drainage pipe of the water-cooled heat exchanger;
s3, connecting the water-cooled heat exchanger with a cooling circulating water system through a water-cooled pipe to cool the cooling water circulating in the water-cooled heat exchanger;
s4, the air quantity is obliquely downward through an air outlet of the air quantity distributor, the quantity of waste gas entering a furnace top roller chamber from waste gas in a direct fire furnace is reduced in a pressing mode, the air quantity of the air quantity distributor is symmetrically blown to the upper part of a furnace throat from the upper surface and the lower surface of the strip steel, the impact force of circulating gas on the strip steel is reduced, and the strip steel in the furnace top roller chamber is prevented from shaking or shaking;
s5, measuring the internal temperature of the furnace top roller chamber through a strip steel inlet area thermometer and a strip steel outlet area thermometer;
and S6, measuring the temperature of the outlet circulating gas of the variable-frequency circulating fan in real time through the outlet thermometer of the variable-frequency circulating fan, and controlling the internal temperature of the furnace top roller chamber by adjusting the rotating speed of the variable-frequency circulating fan through the temperature controller according to the deviation between the temperature measurement result of the outlet thermometer of the variable-frequency circulating fan and the set target temperature of the circulating gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110001658.4A CN112813250A (en) | 2021-01-04 | 2021-01-04 | Water-cooled temperature control device and method for furnace top roller chamber of direct-fired furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110001658.4A CN112813250A (en) | 2021-01-04 | 2021-01-04 | Water-cooled temperature control device and method for furnace top roller chamber of direct-fired furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024056068A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Jet-type direct-fired preheating system |
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Application publication date: 20210518 |