CN108149002B - Continuous annealing preheating and waste heat recovery system and flexible control method thereof - Google Patents
Continuous annealing preheating and waste heat recovery system and flexible control method thereof Download PDFInfo
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- CN108149002B CN108149002B CN201611094206.0A CN201611094206A CN108149002B CN 108149002 B CN108149002 B CN 108149002B CN 201611094206 A CN201611094206 A CN 201611094206A CN 108149002 B CN108149002 B CN 108149002B
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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
- C21D9/562—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
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention discloses a continuous annealing preheating and waste heat recovery system and a flexible control method thereof, wherein the continuous annealing preheating and waste heat recovery system comprises a preheating section and a waste heat recovery section connected with the preheating section, the preheating section comprises a gas collection chamber, a preheating box body, a heat exchanger, a gas injection air box, a circulating fan and a smoke exhaust fan, the gas collection chamber is communicated with the upper end of the preheating box body, the gas injection air box is provided with a plurality of pairs which are arranged in the preheating box body, the heat exchanger is arranged in each gas injection air box, the circulating fans are also arranged in the preheating box body, each circulating fan is respectively communicated with a pair of gas injection air boxes, the lower end of the preheating box body is communicated with the smoke exhaust fan through a pipeline, the waste heat recovery section comprises recovery equipment and a chimney, and the. The invention can not only improve the energy utilization rate of the tail gas generated by the combustion of the radiant tube, but also fully coordinate the heat load relationship between the jet heating equipment of the preheating section and the superheated water equipment of the waste heat recovery section.
Description
Technical Field
The invention relates to the field of cold-rolled strip steel continuous heat treatment, in particular to a continuous annealing preheating and waste heat recovery system and a flexible control method thereof.
Background
The heating section of a large vertical continuous annealing furnace generally adopts a radiant tube to burn fuel gas to generate heat, and the strip steel is heated by a radiation method, so that a large amount of combustion tail gas is discharged from the radiant tube, the exhaust gas temperature of the radiant tube is generally 700 ℃, and the conventional practice of the cold-rolled strip steel continuous heat treatment technology for reducing energy consumption is to preheat the strip steel in a strip steel heat treatment area by using a preheating device. However, because the capacity of the existing preheating furnace is insufficient, the final exhaust temperature is often still as high as 400-; the heated furnace protective gas basically adopts a convection heat transfer method to heat the strip steel, and the convection heat transfer coefficient of the heating method is lower, so the heating efficiency is lower, the requirement on the capacity of a heat exchanger e in a discharge flue is not high, and the final temperature of the discharged waste gas is higher.
In order to further improve the utilization rate of energy, most of the existing continuous annealing units perform technical improvement work related to waste heat recovery, as shown in fig. 2, a set of waste heat recovery equipment is added behind a preheating furnace to generate superheated water or superheated steam, which is mainly used for cleaning and hot air drying of strip steel. It can be seen from fig. 2 that due to the limitation of the heating capacity of the preheating section (the exhaust temperature of the preheating section is generally 400-. And a part of combustion waste gas directly enters the waste heat recovery device 9 through the valve 2b, and the waste heat recovery device 9 is mainly used for generating superheated water and comprises a cold water inlet 11 and a superheated water outlet 12. Generally speaking, according to design requirements, the waste heat recovery device 9 has certain limits on the temperature and flow of the flue gas, when the heat load of the heating section is high, the normal working range of the waste heat recovery device may be exceeded, in order to ensure the safety of the device, the temperature sensor 6 is arranged on the pipeline, when the temperature of the flue gas is higher than the design requirements, the valve 2d is opened to supplement part of cold air, then the flue gas is cooled, the flowmeter 7 is also arranged on the pipeline to test the flow of the flue gas, when the flow of the flue gas is higher than the design requirements due to the doping of the cold air, the bypass valve 2f has to be opened to discharge part of the flue gas into the chimney, and once the situation occurs, huge waste of energy is implied. The main reasons for analyzing the failure of the current preheating section and waste heat recovery equipment (the energy recovery of the equipment is generally less than 5%) to work sufficiently and effectively at the same time are as follows: the preheating section has poor heating capacity and poor regulating capacity.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a continuous annealing preheating and waste heat recovery system and a flexible control method thereof, which can improve the energy utilization rate of the combustion tail gas of a radiant tube, reduce the energy waste, fully coordinate the heat load relationship between the air injection heating equipment of the preheating section and the superheated water equipment of the waste heat recovery section, coordinate the heating speed of the strip steel of the preheating section and the relationship between the production of the superheated water, and evaluate the optimal cooperative working condition of the air injection heating equipment of the preheating section and the superheated water equipment of the waste heat recovery section.
In order to achieve the purpose, the invention adopts the following technical scheme:
on the one hand, a move back and preheat and waste heat recovery system, including preheating section and the waste heat recovery section that links to each other rather than, preheating section includes the collection chamber, preheat the box, the heat exchanger, the jet-propelled bellows, circulating fan and smoke exhaust fan, the collection chamber is used for collecting and storing radiant tube burning waste gas, and communicate with the upper end of preheating the box, the jet-propelled bellows is equipped with the number pair, all locate in the preheating box, all be equipped with a heat exchanger in every jet-propelled bellows, circulating fan is equipped with the several, also all locate in the preheating box, and every circulating fan communicates with a pair of jet-propelled bellows respectively, the lower extreme of preheating the box passes through pipeline and smoke exhaust fan intercommunication, the waste heat recovery section includes recovery plant and chimney, the chimney passes through the pipeline and communicates with recovery plant and.
And a temperature sensor and a flowmeter are also arranged on a pipeline communicated with the preheating box body.
The heat exchanger is a shell-and-tube type gas-gas heat exchanger.
The gas collection chamber is also provided with a pressure regulating valve, and a pipeline for communicating the chimney with the smoke exhaust fan is provided with a regulating valve.
The recovery device is also provided with a cold water inlet and a superheated water outlet.
The circulating fan is a variable-frequency circulating fan.
The heat exchanger and the air injection bellows are of a detachable structure.
The air injection air box is made of heat-resistant stainless steel and is made by laser blanking.
On the other hand, the flexible control method of the continuous annealing preheating and waste heat recovery system comprises the following steps:
s1, burning waste gas of a radiant tube in a gas collection chamber enters a preheating box body through pressure generated by a smoke exhaust fan;
s2, the heat exchanger converts heat energy in the combustion waste gas of the radiation pipe, the heat energy is sprayed to the strip steel through the air injection bellows, the sprayed gas is pressurized through the circulating fan and then returns to the air injection bellows, the heat exchange is carried out through the heat exchanger together with the combustion waste gas of the radiation pipe, and the circulating gas after heat exchange is sprayed to the strip steel through the air injection bellows;
s3, when the heat load in the preheating box body is high, the air quantity of the circulating fan is increased, so that the heat exchange quantity of the circulating gas and the combustion waste gas of the radiation tube is increased, the smoke exhaust temperature of the combustion waste gas of the radiation tube in the preheating section is reduced, and when the heat load in the preheating box body is low, the rotating speed of the circulating fan is reduced or a plurality of heat exchangers are disassembled;
and S4, discharging the waste gas from the preheating box body into a recovery device through a smoke exhaust fan after the waste gas passes through a temperature sensor and a flowmeter in sequence.
In the step S4, when the heat load in the preheating tank is large and the flow rate of the exhaust gas is greater than the requirement of the recycling equipment, the regulating valve is opened to discharge part of the exhaust gas to the chimney.
In the technical scheme, the heat load relationship between the air injection heating equipment of the preheating section and the superheated water equipment of the waste heat recovery section can be fully coordinated, the relationship between the heating speed of the strip steel of the preheating section and the production of superheated water can be coordinated, the heat energy of tail gas combusted by the radiant tube can be fully utilized, the heat efficiency of the radiant tube burner is further improved, the waste of energy is reduced to the maximum extent, and meanwhile, the flexible control of the preheating section and the waste heat recovery section is realized by adjusting the heating capacity of the preheating box body.
Drawings
FIG. 1 is a schematic diagram of waste heat utilization of combustion exhaust gas of a radiant tube in a conventional strip steel continuous heat treatment unit;
FIG. 2 is a schematic diagram of waste heat recovery of a conventional continuous annealing unit;
fig. 3 is a schematic structural diagram of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 3, the continuous annealing preheating and waste heat recovery system provided by the present invention includes a preheating section and a waste heat recovery section connected thereto, the preheating section includes a gas collection chamber 101, a preheating box 102, a heat exchanger 103, a blowing box 104, a circulating fan 105 and a smoke exhaust fan 106, the gas collection chamber 101 is used for collecting and storing the combustion exhaust gas of the radiant tube, and is communicated with the upper end of the preheating box body 102, it can be seen from fig. 3 that the radiant tube combustion tail gas in the gas collection chamber 101 enters the preheating section through the pressure generated by the smoke exhaust fan 106, because the flue gas channel of the preheating section is large enough (the shell side pressure loss of the heat exchanger 103 in the preheating section is designed according to the maximum load of the unit), the situation that the required flue gas pressure is suddenly increased due to high heat load can not occur, therefore, the radiant tube combustion tail gas of the gas collecting chamber 101 does not need to be directly bypassed to the recovery device 107, which is greatly different from the prior waste heat recovery and utilization scheme in fig. 2. The air injection bellows 104 are provided with a plurality of pairs and are arranged in the preheating box body 102, each air injection bellows 104 is internally provided with a heat exchanger 103, the circulating fans 105 are provided with a plurality of circulating fans 105 and are also arranged in the preheating box body 102, each circulating fan 105 is respectively communicated with the air injection bellows 104, the lower end of the preheating box body 102 is communicated with the smoke exhaust fan 106 through a pipeline, the waste heat recovery section comprises a recovery device 107 and a chimney 108, the chimney 108 is respectively communicated with the recovery device 107 and the smoke exhaust fan 106 through pipelines, the preheating box body 102 is internally provided with a jet flow forced heat exchange mode to rapidly transfer the heat energy of the waste gas to the strip steel 99, the jet flow gas is used for heat exchange between the protective gas in the preheating box body 102 and the combustion waste gas of the radiation tube after being pressurized by the circulating fans 105, and the heat exchange is carried out on the strip.
Preferably, a temperature sensor 109 and a flow meter 110 are further disposed on the pipeline connecting the smoke exhaust fan 106 and the preheating tank 102, and generally, the temperature sensor 109 and the flow meter 110 are both involved in the control of the exhaust gas in the preheating section, so that the temperature of the exhaust gas is always controlled within a reasonable range by adjusting the parameters of the relevant equipment in the preheating section. In order to ensure the energy quality (the flue gas temperature is high enough) of the flue gas at the equipment inlet of the waste heat recovery section, a cold air valve is not arranged on an inlet pipeline, so that the temperature of the flue gas at the equipment inlet of the waste heat recovery section is realized by changing the heating capacity of the preheating section. In order to fully utilize the heat energy of the waste gas burned by the radiant tube, the exhaust temperature of the chimney 108 is 150 ℃ and 250 ℃. In order to reduce the resistance loss in the smoke discharging process, the heat exchanger 103 of the preheating section and the equipment of the preheating recovery section adopt proper heat exchange areas.
Preferably, the heat exchanger 103 is a shell-and-tube gas-gas heat exchanger, and since the radiant tube combustion exhaust gas and the circulating gas in the preheating tank 102 complete heat exchange in the air blowing box 104, the heat exchanger 103 is very important for effectively utilizing the heat energy of the radiant tube combustion exhaust gas.
Preferably, the gas collection chamber 101 is further provided with a pressure regulating valve 111, the pressure of the radiant tube combustion waste gas in the gas collection chamber 101 is regulated through the pressure regulating valve 111, a regulating valve 112 is arranged on a pipeline communicating the chimney 108 and the smoke exhaust fan 106, when the heat load in the preheating box body 102 is large and the flow rate of the waste gas is larger than the requirement of the recovery device 107, the regulating valve 112 is opened, and part of the waste gas is discharged to the chimney 108 and is discharged outwards through the chimney 108.
Preferably, the recovery device 107 is further provided with a cold water inlet 113 and a superheated water outlet 114, and the recovery device 107 is generally a gas-water heat exchanger.
Preferably, the circulating fan 105 is a variable frequency circulating fan, and the variable frequency is between 30 Hz and 100Hz in order to fully coordinate the heating capacity of the preheating section and enable the preheating section and the waste heat recovery section to efficiently cooperate with each other.
Preferably, a detachable structure is arranged between the heat exchanger 103 and the air injection bellows 104, so that the elastic working range of the heating capacity of the preheating section is expanded.
Preferably, because the temperature of the combustion waste gas of the radiant tube is higher, generally about 700 ℃, the air injection air box 104 is made of heat-resistant stainless steel, and because the size of the air injection heating equipment in the preheating section has a significant influence on the convection heat transfer coefficient and the return air resistance of the air injection heating, the air injection air box 104 is made by laser blanking so as to control the precision of the size.
Generally speaking, a certain amount of electric energy needs to be consumed in the operation of the circulating fan 105 in the preheating section, the power of the circulating fan 105 is positively correlated with the heat energy utilization rate of the waste gas combusted by the radiant tube, in order to fully utilize the heat energy of the waste gas combusted by the radiant tube and control the power consumption of the circulating fan 105 in the preheating section within a reasonable range, all parameters of the jet heating equipment in the preheating section need to be fully optimized, so that the equipment can operate under a reasonable working condition.
The invention provides a flexible control method of a continuous annealing preheating and waste heat recovery system, which comprises the following steps:
s1, the combustion waste gas of the radiant tubes in the gas collection chamber 101 enters the preheating box body 102 through the pressure generated by the smoke exhaust fan 106, and if the pressure of the combustion waste gas of the radiant tubes in the gas collection chamber 106 is overlarge, the adjustment can be carried out through a pressure regulating valve 111 at the lower end of the gas collection chamber.
S2, the heat exchanger 103 converts heat energy in the combustion waste gas of the radiant tube, the heat energy is sprayed to the strip steel 99 through the air spraying air box 104, the sprayed gas is pressurized through the circulating fan 105 and then returns to the air spraying air box 104, the heat exchange is carried out on the sprayed gas and the combustion waste gas of the radiant tube through the heat exchanger 103, and the circulating gas after heat exchange is sprayed to the strip steel 99 through the air spraying air box 104.
S3, when the heat load in the preheating box body 102 is high, the air quantity of the circulating fan 105 is increased, so that the heat exchange quantity of the circulating gas and the combustion waste gas of the radiation tube is increased, the smoke exhaust temperature of the combustion waste gas of the radiation tube in the preheating section is reduced, the temperature requirement of the recovery device 107 under the condition that cold air is not mixed is met, when the heat load in the preheating box body is low, the rotating speed of the circulating fan 105 is reduced, even a plurality of circulating fans 105 are closed under the extreme condition, the protection purpose of the heat exchanger 103 can be achieved, if water precipitated from smoke corrodes the heat exchanger 103, the heat load requirement of the recovery device 107 can be met, and therefore the whole continuous annealing device is more flexible in the whole energy utilization process.
In addition, a plurality of heat exchangers 103 can be disassembled, and the number of groups of the heat exchangers 103 can be flexibly arranged according to the waste heat recovery section and the optimized waste gas utilization working condition so as to achieve flexible control of the preheating section and the waste heat recovery section.
And S4, discharging the waste gas from the preheating box body 102 to a recovery device 107 through a smoke exhaust fan 106 after the waste gas passes through a temperature sensor 109 and a flowmeter 110 in sequence. Generally speaking, the temperature sensor 109 and the flow meter 110 participate in the control of the utilization of the exhaust gas in the preheating section, and the temperature of the exhaust gas is always controlled in a reasonable range by adjusting the parameters of the preheating section equipment, so that a large amount of exhaust gas waste heat can be transferred to the strip steel 99, and cold air does not need to be doped in the whole exhaust gas energy utilization process due to the limitation of the equipment, so that the reduction of the energy quality does not occur, and the smoke exhaust equipment cannot be corroded due to the too low smoke exhaust temperature.
Preferably, in the step S4, when the heat load in the preheating tank 102 is large and the flow rate of the exhaust gas is greater than the requirement of the recycling device 107, the adjusting valve 112 is opened to discharge part of the exhaust gas to the chimney 108, and the recycling device 107 is generally a gas-water heat exchanger and is provided with a cold water inlet 113 and a superheated water outlet 114.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (7)
1. A continuous annealing preheating and waste heat recovery system is characterized by comprising a preheating section and a waste heat recovery section connected with the preheating section,
the preheating section comprises a gas collecting chamber, a preheating box body, heat exchangers, air injection bellows, circulating fans and a smoke exhaust fan, wherein the gas collecting chamber is used for collecting and storing combustion waste gas of the radiant tube and communicated with the upper end of the preheating box body, a plurality of pairs of air injection bellows are arranged in the preheating box body, each air injection bellows is internally provided with one heat exchanger, a plurality of circulating fans are also arranged in the preheating box body, each circulating fan is respectively communicated with a pair of air injection bellows, the lower end of the preheating box body is communicated with the smoke exhaust fan through a pipeline,
the waste heat recovery section comprises a recovery device and a chimney, the chimney is respectively communicated with the recovery device and the smoke exhaust fan through pipelines,
wherein the heat exchanger is a shell-and-tube gas-gas heat exchanger,
the air-jet air box is made of heat-resistant stainless steel and is made by laser blanking,
the circulating fan is a variable-frequency circulating fan.
2. The continuous annealing preheating and waste heat recovery system of claim 1, wherein a temperature sensor and a flow meter are further arranged on a pipeline communicating the smoke exhaust fan and the preheating box body.
3. The continuous annealing preheating and waste heat recovery system of claim 1, wherein the collection chamber is further provided with a pressure regulating valve, and a pipeline for communicating the chimney with the smoke exhaust fan is provided with a regulating valve.
4. The continuous annealing preheating and waste heat recovery system of claim 1, wherein said recovery apparatus further comprises a cold water inlet and a superheated water outlet.
5. The continuous annealing preheating and waste heat recovery system according to claim 1, wherein the heat exchanger and the air blowing box are detachable.
6. The flexible control method of the continuous annealing preheating and waste heat recovery system according to claim 1, comprising the steps of:
s1, burning waste gas of a radiant tube in a gas collection chamber enters a preheating box body through pressure generated by a smoke exhaust fan;
s2, the heat exchanger converts heat energy in the combustion waste gas of the radiation pipe, the heat energy is sprayed to the strip steel through the air injection bellows, the sprayed gas is pressurized through the circulating fan and then returns to the air injection bellows, the heat exchange is carried out through the heat exchanger together with the combustion waste gas of the radiation pipe, and the circulating gas after heat exchange is sprayed to the strip steel through the air injection bellows;
s3, when the heat load in the preheating box body is high, the air quantity of the circulating fan is increased, so that the heat exchange quantity of the circulating gas and the combustion waste gas of the radiation tube is increased, the smoke exhaust temperature of the combustion waste gas of the radiation tube in the preheating section is reduced, and when the heat load in the preheating box body is low, the rotating speed of the circulating fan is reduced or a plurality of heat exchangers are disassembled;
and S4, discharging the waste gas from the preheating box body into a recovery device through a smoke exhaust fan after the waste gas passes through a temperature sensor and a flowmeter in sequence.
7. The flexible control method of the continuous annealing preheating and waste heat recovery system according to claim 6, wherein in the step S4, when the heat load in the preheating tank is large and the flow rate of the exhaust gas is larger than the requirement of the recovery device, the adjusting valve is opened to discharge part of the exhaust gas to the chimney.
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| CN201611094206.0A CN108149002B (en) | 2016-12-02 | 2016-12-02 | Continuous annealing preheating and waste heat recovery system and flexible control method thereof |
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| CN201611094206.0A CN108149002B (en) | 2016-12-02 | 2016-12-02 | Continuous annealing preheating and waste heat recovery system and flexible control method thereof |
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| CN108149002B true CN108149002B (en) | 2020-03-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111286598B (en) * | 2020-03-20 | 2021-11-19 | 首钢京唐钢铁联合有限责任公司 | Method, device and system for controlling temperature of preheating section of annealing furnace |
| CN111912245A (en) * | 2020-07-24 | 2020-11-10 | 湖北翊通铸业有限公司 | Annealing furnace waste heat recovery utilizes device |
| CN117737393A (en) * | 2022-09-15 | 2024-03-22 | 宝山钢铁股份有限公司 | Jet radiant tube preheating system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735613A (en) * | 1980-08-12 | 1982-02-26 | Chugai Ro Kogyo Kaisha Ltd | Radiant tube type continuous heat treatment furnace |
| CN201387250Y (en) * | 2009-03-25 | 2010-01-20 | 耿凯 | Heat exchanger |
| CN201696323U (en) * | 2010-05-10 | 2011-01-05 | 河南省诺顿节能技术有限公司 | Energy-saving controller of blower and waste heat recovery energy-saving control system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5672133A (en) * | 1979-11-19 | 1981-06-16 | Nippon Steel Corp | Preheating apparatus for continuous annealing furnace |
| JPS61157641A (en) * | 1984-12-28 | 1986-07-17 | Chugai Ro Kogyo Kaisha Ltd | Continuous annealing furnace for metallic strip |
| JP2002294347A (en) * | 2001-03-28 | 2002-10-09 | Nippon Steel Corp | Method and device for jet preheating strip continuous annealing facility |
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2016
- 2016-12-02 CN CN201611094206.0A patent/CN108149002B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735613A (en) * | 1980-08-12 | 1982-02-26 | Chugai Ro Kogyo Kaisha Ltd | Radiant tube type continuous heat treatment furnace |
| CN201387250Y (en) * | 2009-03-25 | 2010-01-20 | 耿凯 | Heat exchanger |
| CN201696323U (en) * | 2010-05-10 | 2011-01-05 | 河南省诺顿节能技术有限公司 | Energy-saving controller of blower and waste heat recovery energy-saving control system |
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