CN110172565B - Waste heat recycling system of cover-type annealing furnace - Google Patents
Waste heat recycling system of cover-type annealing furnace Download PDFInfo
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- CN110172565B CN110172565B CN201810687641.7A CN201810687641A CN110172565B CN 110172565 B CN110172565 B CN 110172565B CN 201810687641 A CN201810687641 A CN 201810687641A CN 110172565 B CN110172565 B CN 110172565B
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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
- C21D9/663—Bell-type furnaces
- C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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
- Y02P10/25—Process efficiency
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- Materials Engineering (AREA)
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
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Abstract
The invention discloses a waste heat recycling system of a hood-type annealing furnace, which comprises a smoke exhaust port, a smoke exhaust flue, a circulating water station and an emulsion pool, and further comprises a first heat exchanger positioned in the smoke exhaust flue, a second heat exchanger arranged at the smoke exhaust port, a third heat exchanger arranged in the emulsion pool and a heat energy compensation device, wherein the first heat exchanger, the second heat exchanger, the circulating water station and the third heat exchanger are communicated through a main pipeline to form a circulating loop, the heat energy compensation device is positioned between the second heat exchanger and the third heat exchanger, the heat energy compensation device is arranged on a bypass pipeline outside the circulating water main pipeline, and a temperature adjusting system is arranged in the emulsion pool. The invention realizes the classified recycling of the exhaust smoke waste heat of the hood-type annealing furnace with higher efficiency, achieves the aim of energy saving and consumption reduction, and can simultaneously use the recycled smoke heat for heating emulsion in the cold rolling process.
Description
Technical Field
The invention relates to the technical field of waste gas waste heat recovery, in particular to a waste heat recovery and utilization system of a hood-type annealing furnace.
Background
The iron and steel industry is an important basic industry of national economy and has the characteristic of energy density. The steel output in China is the first in the world for many years, but the comprehensive energy consumption of the steel industry is different from the international advanced level, and considerable heat in the processes of sintering, blast furnace and steelmaking cannot be recycled. With the deep promotion of energy conservation and emission reduction in China, the repulsive force of structure adjustment and energy consumption reduction in the steel industry is increasingly huge.
The cold-rolled strip steel product with excellent structure and processing performance can be widely applied to the industries of automobiles, household appliances, buildings, mechanical manufacturing and the like. At present, the production process of cold-rolled strip steel products generally takes hot-rolled products as raw materials, and completes the manufacture of the products through three procedures of acid washing, cold rolling and annealing, wherein in the annealing process, batch annealing of strip steel is completed by using cover type annealing furnace equipment. In order to improve the production efficiency and match the production capacity of a rolling mill, a plurality of hood-type annealing furnaces are often used to form a hood-type annealing furnace group, the hood-type annealing furnaces use high hydrogen or total hydrogen as protective atmosphere, resistance wires or fuel gas are used for heating, and when the hood-type annealing furnaces are heated by the fuel gas, the smoke such as titanium dioxide generated by combustion of the fuel gas is discharged out of the furnace body through a smoke discharge pipeline. Although theoretically, the smoke does not generate toxic and harmful substances and does not pollute the atmosphere, the smoke exhaust temperature of the smoke is between 250 ℃ and 700 ℃, and the part of the smoke carries a large amount of heat and is directly discharged to cause the loss of a large amount of heat energy.
Meanwhile, when cold rolling is carried out on a cold-rolled strip steel product in a cold rolling mill, an emulsion composed of rolling oil and water is needed to lubricate and cool a rolling surface, the rolling emulsion needs to be maintained at a certain temperature in an emulsion station, generally between 50 ℃ and 60 ℃, the temperature is too low to be beneficial to the lubrication of the strip steel, bacteria are easy to breed in the emulsion station, a steam heat exchanger or an electric heater is generally installed in a cold-rolled emulsion tank to maintain the temperature of the emulsion, a large amount of public and auxiliary facilities are needed for heating by using steam, and the use cost of electric heating is high.
On one hand, the cover type annealing furnace discharges flue gas containing a large amount of heat value into the atmosphere, and on the other hand, the medium needing to be heated continuously consumes energy, which is not in the same way as the energy conservation and emission reduction advocated at present. Therefore, the method is necessary to fully utilize the flue gas waste heat of the process section of the hood-type annealing furnace, and brings certain benefits to enterprises while reducing energy consumption.
Disclosure of Invention
The invention provides a waste heat recycling system of a hood-type annealing furnace, which can solve the problem of insufficient utilization of waste heat of smoke discharged by the hood-type annealing furnace and can simultaneously use the waste heat of combustion smoke of the hood-type annealing furnace for heating emulsion in the cold rolling process.
In order to solve the problems, the invention adopts the following technical scheme:
a waste heat recycling system of a hood-type annealing furnace comprises a smoke exhaust port on the hood-type annealing furnace, a smoke exhaust flue connected with the smoke exhaust port, a circulating water station and an emulsion pool, and is characterized by further comprising a first heat exchanger positioned in the smoke exhaust flue, a second heat exchanger arranged at the smoke exhaust port, a third heat exchanger arranged in the emulsion pool and a heat energy compensation device, wherein the first heat exchanger, the second heat exchanger, the circulating water station and the third heat exchanger are communicated through a main pipeline to form a circulating loop, the flowing direction of circulating water in the main pipeline is opposite to the flowing direction of smoke gas in the smoke exhaust port, the heat energy compensation device is positioned between the second heat exchanger and the third heat exchanger, the heat energy compensation device is arranged on a bypass pipeline outside the main pipeline of circulating water, and a temperature adjusting system is arranged in the emulsion pool, the heat energy compensation device is controlled by a temperature adjusting system in the emulsion tank.
According to the preferable technical scheme, the first heat exchanger is composed of a plurality of capillary fin copper pipes, each capillary fin copper pipe forms a U-shaped loop, and the cross section area of each capillary fin copper pipe is not more than one third of the smoke exhaust flue area of the hood-type annealing furnace.
The further technical effect is that the circulating water can be fully contacted with the waste heat of the flue gas through the U-shaped fin copper pipe, so that the circulating water is fully heated, and the heat exchange rate is improved; the area of the section of the fin copper tube is set to be not more than one third of the area of a smoke exhaust flue of the hood-type annealing furnace, so that the flow resistance of smoke exhaust is reduced; the residual heat of the flue gas in the flue of the hood-type annealing furnace is effectively recovered, and the stable and continuous smoke discharge of the flue of the hood-type annealing furnace can be ensured.
Preferably, the second heat exchanger and the third heat exchanger are fin-tube heat exchangers.
The further technical effect lies in that the finned tube heat exchanger is selected, so that the contact area between the circulating water in the pipeline and the flue gas can be increased, the absorption efficiency of the circulating water in the pipeline to the heat in the flue gas is further improved, and the rapid heating of the emulsion in the emulsion pool by the third heat exchanger is also realized.
Preferably, the heat energy compensation device comprises a heat supplementing device and a circulating water pipeline, and the circulating water pipeline is formed by connecting a plurality of fin copper pipes in parallel.
The heat energy compensation device has the advantages that the circulating water pipeline in the heat energy compensation device is formed by connecting a plurality of fin copper pipes in parallel, so that the heat exchange efficiency between the circulating water in the pipeline and the heat supplementing device is increased, and the temperature of the circulating water is quickly and obviously increased.
Preferably, a water inlet valve is arranged on a main pipeline between the first heat exchanger and the circulating water station, and a blow-off valve and a water outlet valve are sequentially arranged on a main pipeline between the second heat exchanger and the third heat exchanger.
The further technical effect lies in that the setting is diffused the valve and is used for discharging the vapor in the high temperature circulating water pipeline, has guaranteed the operation of entire system safety and stability, sets up water inlet valve and delivery port valve and is convenient for be according to the flow of real-time condition control system pipeline well circulating water.
Preferably, a temperature monitoring device is arranged in the first heat exchanger, the temperature checking device comprises a temperature sensor and a control device, and the control device can automatically control the water inlet valve, the water outlet valve and the bleeding valve.
The further technical effect is that because the water temperature in the circulating water pipeline is too low, the energy consumption of the system can be increased, and the maintenance of the temperature of the emulsified liquid is not facilitated; the circulating water is easy to boil and vaporize due to overhigh temperature, so that knocking is generated, and potential safety hazards are brought. Therefore, the temperature monitoring device is arranged in the first heat exchanger, the automatic control system is adopted, and the circulating water flow is increased or reduced by automatically regulating and controlling the flow regulating device by controlling the water inlet and outlet valve, so that the effect of controlling the circulating water temperature is achieved.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, the first heat exchanger is arranged at the smoke outlet of the hood-type annealing furnace, the second heat exchanger is arranged in the smoke exhaust flue of the hood-type annealing furnace, the low-temperature circulating water flowing through the heat exchangers is heated step by step in a grading manner, the flowing direction of the circulating water in the circulating pipeline is opposite to the flowing direction of the smoke, and the heat recovered from the smoke is used for heating the emulsion, so that the waste heat of the smoke in the prior art is overcome, the heat of the smoke is recycled in a grading manner with higher efficiency, and the purposes of saving energy and reducing consumption are achieved;
(2) according to the invention, the heat energy compensation device is arranged to continuously and stably provide a heat source for the emulsion pool under the condition that the heat energy of the flue gas of the hood-type annealing furnace is not enough, so that the stable and continuous operation of the whole system is ensured; the heat energy compensation device is arranged on a bypass pipeline outside the main circulating water pipeline, and does not intervene in a circulating water system when heat supplement is not needed, so that the circulating resistance of circulating water is reduced;
(3) the temperature regulation system in the emulsion tank controls the starting and closing of the temperature compensation device in due time by monitoring the real-time temperature in the emulsion tank, so that the intelligent control is realized, and the operation is simpler and more convenient.
Drawings
FIG. 1 is a schematic diagram of the arrangement of a waste heat recovery system of a hood-type annealing furnace.
Wherein the specific reference numerals are as follows: the device comprises a hood-type annealing furnace 1, a smoke outlet 2, a first heat exchanger 3, a second heat exchanger 4, a smoke exhaust flue 5, a circulating water station 6, a third heat exchanger 7, an emulsion pool 8, a compensating device 9, a high-temperature circulating water pipeline 10 and a low-temperature circulating water pipeline 11.
Detailed Description
The present invention is described in detail below with reference to examples:
as shown in figure 1, the waste heat recycling system of the hood-type annealing furnace comprises a second heat exchanger 4 arranged in a smoke exhaust flue 5, a first heat exchanger 3 arranged in a smoke exhaust port 2 of the hood-type annealing furnace 1, a circulating water station 6, a heat energy compensation device 9, a third heat exchanger 7 arranged in an emulsion pool 8 and the emulsion pool 8. Circulating water flows into the second heat exchanger 4 and the first heat exchanger 3 in sequence under the action of a water pump in the circulating water station 6, the temperature of the circulating water is increased, then the circulating water enters a high-temperature circulating water pipeline 10 and flows to an emulsion tank 8, and if the temperature of the circulating water is insufficient, the circulating water is heated by a heat energy compensation device 9 until the water temperature meets the requirement. After the high-temperature circulating water flows into the third heat exchanger 7 in the emulsion pool 8 to heat the emulsion, the temperature is reduced and the circulating water flows back to the circulating water station 6.
The second heat exchanger 4 is a fin tube type heat exchanger, the length of the fin tube type heat exchanger can be adjusted according to the length of a smoke exhaust flue 5 of the hood-type annealing furnace 1, low-temperature circulating water flowing out of a circulating water station 6 pump enters the second heat exchanger 4 through a low-temperature circulating water pipeline 11 for primary heating, the flowing direction of the circulating water in the pipeline is opposite to the flowing direction of smoke in the flue, and therefore heat in the smoke is fully utilized. The first heat exchanger 3 is arranged at the smoke outlet 2 of the bell-type annealing furnace 1 and used for further heating circulating water, the heat exchanger consists of a plurality of capillary fin copper pipes, each capillary fin copper pipe forms a U-shaped loop, and the circulating water passes through the fin copper pipes and enters the high-temperature circulating water pipeline 10 after being fully heated. In order to reduce the smoke discharge resistance, the cross-sectional area (including the projected area of the fins) of the capillary is not more than one third of the total area of the smoke discharge pipe of the hood-type annealing furnace 1.
The second heat exchanger 4 and the first heat exchanger 3 jointly form a circulating water heater, each hood-type annealing furnace 1 is provided with a smoke exhaust flue 5, so that a group of circulating water heaters are arranged in each smoke exhaust flue 5, the circulating water heating devices are connected with a circulating water station 6 through a main pipeline, the water inlet end and the water outlet end of each circulating water heater are provided with valves which can be automatically or manually closed, and the high-temperature water end is also provided with a bleeding valve for discharging water vapor in the pipeline. The temperature of the circulating water after passing through the circulating water heater is preferably 85-95 ℃, the energy consumption of the system is increased when the water temperature is too low, and the maintenance of the temperature of the emulsion is not facilitated; the circulating water is easy to boil and vaporize due to overhigh temperature, so that knocking is generated, and potential safety hazards are brought. Therefore, a temperature monitoring device is arranged in the first heat exchanger 3 and comprises a temperature sensor and a control device, the control device is electrically connected with the water inlet valve, the water outlet valve and the bleeding valve, an automatic control system is adopted, when the temperature of circulating water exceeds a certain set value (such as 90 ℃), the system can automatically regulate and control the water inlet valve and the water outlet valve to increase the flow of the circulating water, and when the temperature of the circulating water is lower than a certain set value (such as 80 ℃), the system can automatically regulate and control the water inlet valve and the water outlet valve to reduce the flow of the circulating water. Under the general condition, the design flow of the circulating water heater is enough to control the temperature of the circulating water, when the heat exchanger is blocked and other conditions occur, the flow in the pipeline is insufficient, so that the water temperature exceeds the standard, when the temperature of the circulating water exceeds 95 ℃, an alarm is given, a water inlet valve and a water outlet valve on the circulating water pipeline are automatically closed, and a bleeding valve is opened, so that the stability of the temperature of the water in the high-temperature circulating water pipeline 10 is ensured.
High-temperature circulating water flowing out of each circulating water heater is converged into a high-temperature circulating water main pipeline, and a heat energy compensation device 9 is arranged on the high-temperature circulating water main pipeline and used for continuously and stably providing a heat source for an emulsion station under the condition that the heat energy of the flue gas of the hood-type annealing furnace 1 is insufficient (such as the condition that the hood-type annealing furnace 1 stops production or has extremely severe cold climate and the like). The heat energy compensation device 9 is arranged on a bypass pipeline outside the main circulating water pipeline, and does not intervene in a circulating water system when heat supplement is not needed, so that the circulating resistance of circulating water is reduced. The circulating water pipeline in the heat energy compensation device 9 is formed by connecting a plurality of fin copper pipes in parallel, the fin copper pipes are directly heated by flame and smoke generated by combustion of the fuel gas by taking the fuel gas as an energy source, and therefore the temperature of the circulating water is increased. The smoke generated by the combustion of the heat supplementing device is converged into a smoke exhaust flue 5 of the hood-type annealing furnace 1 through a one-way valve.
The third heater in the emulsion tank 8 is a finned tube heat exchanger for heating the emulsion. The high-temperature circulating water is cooled into low-temperature circulating water after passing through the third heater, and finally flows back into the circulating water station 6. An emulsion temperature adjusting system is arranged in the emulsion station, and the system adjusts the flow of circulating water by monitoring the real-time temperature in the emulsion tank 8 and starts the temperature compensation device 9 in due time.
Example one
A certain bell-type annealing furnace 1 group consists of 6 furnace platforms, the volume of an emulsion pool 8 is 200 cubic meters, under the normal production condition, 4 furnace platforms are in a heating process, and 2 furnace platforms are in a cooling process. After the waste heat recovery system is used, combustion flue gas of 4 furnace platforms in a heating process is used as a heat source to heat circulating water, and the flow rate of the circulating water is constant to 100L/min. After a period of operation, the water temperature in the circulating water station 6 is stabilized at 55 ℃, after being heated by 4 groups of circulating water heaters, the water temperature is raised to 90 ℃, the compensation device 9 is not required to be started, and the temperature of the emulsion tank 8 can be kept at 50 ℃ through waste heat recovery.
Example two
A certain bell-type annealing furnace 1 group consists of 6 furnace platforms, the volume of an emulsion pool 8 is 200 cubic meters, only two furnace platforms are in a heating state due to insufficient orders, and 1 furnace platform is in a cooling state. After the waste heat recovery system is put into use, the circulating water volume is constant at 100L/min. After a period of time, the water temperature in the circulating water station 6 is stabilized at 55 ℃, after being heated by 2 groups of circulating water heaters, the water temperature is raised to 70 ℃, because the water temperature is insufficient, the temperature of the emulsion in the emulsion tank 8 begins to be gradually lowered, at the moment, the compensation device 9 is started, the temperature of the circulating water reaches 90 ℃ after passing through the compensation device 9, and the temperature of the emulsion in the emulsion tank 8 is gradually restored to 50 ℃.
EXAMPLE III
A certain bell-type annealing furnace 1 group consists of 12 furnace platforms, the volume of an emulsion pool 8 is 300 cubic meters, under the normal production condition, 8 furnace platforms are in a heating process, and 4 furnace platforms are in a cooling process. After the waste heat recovery system is put into use, the circulating water flow is constant at 200L/min, after a period of time operation, the circulating water temperature is maintained at 90 ℃, but the emulsion temperature is continuously increased, the water temperature in the circulating water station 6 is also continuously increased, at the moment, 2 circulating water pipelines in a heating state furnace platform are closed, the diffusion valves on the two circulating water heaters are opened, so that residual water in the heaters is vaporized and diffused out of the system, after the two circulating water heaters are closed, only 6 groups of circulating water heaters are in a working state, the circulating water flow is reduced to 150L/min, and the emulsion temperature is gradually reduced and returns to a normal level.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (6)
1. A waste heat recycling system of a hood-type annealing furnace comprises a smoke exhaust port on the hood-type annealing furnace, a smoke exhaust flue connected with the smoke exhaust port, a circulating water station and an emulsion pool, and is characterized by further comprising a first heat exchanger positioned in the smoke exhaust flue, a second heat exchanger arranged at the smoke exhaust port, a third heat exchanger arranged in the emulsion pool and a heat energy compensation device, wherein the first heat exchanger, the second heat exchanger, the circulating water station and the third heat exchanger are communicated through a main pipeline to form a circulating loop, the flowing direction of circulating water in the main pipeline is opposite to the flowing direction of smoke gas in the smoke exhaust port, the heat energy compensation device is positioned between the second heat exchanger and the third heat exchanger, the heat energy compensation device is arranged on a bypass pipeline outside the main pipeline of circulating water, and a temperature adjusting system is arranged in the emulsion pool, the heat energy compensation device is controlled by a temperature adjusting system in the emulsion tank.
2. The waste heat recovery system of the hood-type annealing furnace according to claim 1, wherein the first heat exchanger is composed of a plurality of capillary finned copper tubes, each capillary finned copper tube forms a U-shaped loop, and the cross-sectional area of the capillary finned copper tube is not more than one third of the area of the flue of the hood-type annealing furnace.
3. The hood annealing furnace waste heat recovery system according to claim 1, wherein the second heat exchanger and the third heat exchanger are fin-and-tube heat exchangers.
4. The waste heat recovery system of the hood-type annealing furnace according to claim 1, wherein the heat energy compensating device comprises a heat supplementing device and a circulating water pipeline, and the circulating water pipeline is formed by connecting a plurality of finned copper pipes in parallel.
5. The waste heat recycling system of a hood-type annealing furnace according to claim 1, wherein a water inlet valve is arranged on a main pipe between the first heat exchanger and the circulating water station, and a blow-off valve and a water outlet valve are arranged on a main pipe between the second heat exchanger and the third heat exchanger in sequence.
6. The waste heat recovery system of a hood-type annealing furnace according to claim 5, wherein a temperature monitoring device is provided in the first heat exchanger, the temperature monitoring device comprises a temperature sensor and a control device, and the control device can automatically control the water inlet valve, the water outlet valve and the blow-off valve.
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| CN201810687641.7A CN110172565B (en) | 2018-06-28 | 2018-06-28 | Waste heat recycling system of cover-type annealing furnace |
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| CN201810687641.7A CN110172565B (en) | 2018-06-28 | 2018-06-28 | Waste heat recycling system of cover-type annealing furnace |
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| CN110172565B true CN110172565B (en) | 2021-02-09 |
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| CN102012169B (en) * | 2010-12-28 | 2013-02-27 | 中冶南方(武汉)威仕工业炉有限公司 | Method for secondarily recycling smoke gas waste heat of continuous annealing furnace |
| CN105132666A (en) * | 2014-05-30 | 2015-12-09 | 宝山钢铁股份有限公司 | Pickling-free continuous annealing furnace reducing gas recycle use system and use method thereof |
| CN104930867A (en) * | 2015-07-13 | 2015-09-23 | 重庆顺博铝合金股份有限公司 | Heating furnace heat cycle system |
| CN108151045A (en) * | 2017-12-20 | 2018-06-12 | 广东也节能科技有限公司 | A kind of flue gas heat recovery system |
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