CN117606253A - Flue gas waste heat utilization system of annealing furnace - Google Patents
Flue gas waste heat utilization system of annealing furnace Download PDFInfo
- Publication number
- CN117606253A CN117606253A CN202311676143.XA CN202311676143A CN117606253A CN 117606253 A CN117606253 A CN 117606253A CN 202311676143 A CN202311676143 A CN 202311676143A CN 117606253 A CN117606253 A CN 117606253A
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- China
- Prior art keywords
- water
- waste heat
- flue gas
- heat exchanger
- heat utilization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 54
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- 238000000137 annealing Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000008236 heating water Substances 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 108091006146 Channels Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
-
- 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
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
-
- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to the technical field of waste heat utilization and discloses a waste heat utilization system of flue gas of an annealing furnace, which comprises waste heat recovery equipment, wherein the waste heat recovery equipment comprises an air-water heat exchanger, the air-water heat exchanger is arranged on a flue gas discharge channel, a water inlet and a water outlet of the air-water heat exchanger are respectively connected with the waste heat utilization equipment to form a loop, and water circulation equipment is arranged in the loop. According to the flue gas waste heat utilization system of the annealing furnace, most of heat in flue gas generated by steel rolling in the annealing furnace is recycled after the treatment of the invention, so that the emission of pollutants is reduced, the pollution to the environment is lightened, the cost of flue gas emission is reduced, the recycled heat is applied to heating water temperature and high-temperature water is provided for a user side, the steam consumption of the user side is saved, the energy is fully utilized, and the energy conservation and emission reduction are realized.
Description
Technical Field
The invention relates to the technical field of waste heat utilization, in particular to a flue gas waste heat utilization system of an annealing furnace.
Background
In the production process of rolled steel, the annealing furnace can generate high-heat smoke, but at present, no good equipment can recycle the heat in the smoke, and the smoke is too high in temperature and can be discharged after being mixed with outdoor fresh air for cooling, so that the cost of smoke discharge is increased, energy waste is caused, and the environment is polluted.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an annealing furnace flue gas waste heat utilization system, which solves the problems in the background art.
(II) technical scheme
In order to achieve the above object, the present invention provides the following technical solutions: the system comprises waste heat recovery equipment, wherein the waste heat recovery equipment comprises an air-water heat exchanger, the air-water heat exchanger is arranged on a flue gas discharge channel, a water inlet and a water outlet of the air-water heat exchanger are respectively connected with the waste heat utilization equipment to form a loop, and water circulation equipment is arranged in the loop.
Preferably, the water circulation device comprises a water pump, the water pump is connected in series on a loop pipeline between the air-water heat exchanger and the waste heat utilization device, and the water pump is a variable-frequency water pump.
Preferably, the water circulation device further comprises a variable-frequency water pump controller, a thermometer and a flowmeter, wherein the thermometer and the flowmeter are arranged at the water outlet of the air-water heat exchanger and are connected with the variable-frequency water pump controller, and the variable-frequency water pump controller is further connected with the variable-frequency water pump.
Preferably, the waste heat utilization device comprises an air-water/air-steam combined heat exchanger, a steam flow controller and a temperature detection device, wherein a water inlet and a water outlet of the combined heat exchanger are respectively connected with the air-water heat exchanger to form a loop, the steam flow controller is connected with a steam valve of the combined heat exchanger, and the steam flow controller is also connected with the temperature detection device.
Preferably, the system further comprises an auxiliary heating device, and a steam outlet and a steam inlet of the auxiliary heating device are respectively connected with the steam inlet and the steam outlet of the combined heat exchanger.
Preferably, an automatic voltage stabilizing control device is arranged in the loop between the water circulation device and the waste heat utilization device.
Preferably, the automatic voltage stabilizing control device comprises a water supplementing device, a pressure releasing device, a water storage device and a pressure detecting device, wherein the pressure detecting device is connected with a loop pipeline, the loop pipeline is further connected with the water storage device, the water storage device is further connected with the water supplementing device and the pressure releasing device, and the pressure detecting device is further connected with the water supplementing device and the pressure releasing device.
(III) beneficial effects
Compared with the prior art, the invention provides an annealing furnace flue gas waste heat utilization system, which has the following beneficial effects:
according to the flue gas waste heat utilization system of the annealing furnace, most of heat in flue gas generated by steel rolling in the annealing furnace is recycled after the treatment of the invention, so that the emission of pollutants is reduced, the pollution to the environment is lightened, the cost of flue gas emission is reduced, the recycled heat is applied to heating water temperature and high-temperature water is provided for a user side, the steam consumption of the user side is saved, the energy is fully utilized, and the energy conservation and emission reduction are realized.
Drawings
Fig. 1 is a schematic diagram of a flue gas waste heat utilization system of an annealing furnace.
In the figure: 1. waste heat recovery equipment, a gas-water heat exchanger, waste heat utilization equipment, a variable-frequency water pump, water circulation equipment, automatic pressure-stabilizing control equipment, auxiliary heating equipment, a thermometer and a flowmeter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Specific examples:
as shown in fig. 1, the flue gas waste heat utilization system of the annealing furnace comprises waste heat recovery equipment 1, wherein the waste heat recovery equipment 1 comprises a gas-water heat exchanger 2, the gas-water heat exchanger 2 is arranged on a flue gas discharge channel of the annealing furnace, and a water inlet and a water outlet of the gas-water heat exchanger 2 are respectively connected with waste heat utilization equipment 3 and form a loop.
The water circulation device 5 is arranged in the loop, the water circulation device 5 comprises a water pump, the water pump is connected in series on a loop pipeline between the air-water heat exchanger and the waste heat utilization device 3, the water pump is preferably a variable frequency water pump 4, water in the whole loop is driven by the variable frequency water pump 4, the waste heat utilization device 3 comprises an air-water/air-steam combined heat exchanger, and a water inlet and a water outlet of the combined heat exchanger are respectively connected with the air-water heat exchanger to form a loop.
The flue gas of the annealing furnace containing high heat enters the gas-water heat exchanger 2 through the discharge channel, water in the gas-water heat exchanger 2 is heated to 130-150 ℃, the water flows along the loop under the drive of the variable frequency water pump 4, the water in the loop enters the combined heat exchanger through the water inlet of the combined heat exchanger, the heat in the water is transferred to the user side by utilizing the gas-water heat exchange function of the combined heat exchanger, the cooled water enters the loop circulation through the water outlet of the combined heat exchanger, and the water is heated in the waste heat recovery equipment 1, so that the waste heat in the flue gas of the annealing furnace is recycled fully.
The water circulation device 5 further comprises a variable-frequency water pump controller, a thermometer 8 and a flowmeter 9, wherein the thermometer 8 and the flowmeter 9 are arranged at the water outlet of the air-water heat exchanger 2 and are connected with the variable-frequency water pump controller, and the variable-frequency water pump controller is further connected with the variable-frequency water pump 4.
The thermometer 8 and the flowmeter 9 respectively measure the temperature information and the flow information of the water flowing out of the air-water heat exchanger 2, when the temperature of the water flowing out of the air-water heat exchanger 2 measured by the thermometer 8 is lower than the heat supply requirement of the waste heat utilization equipment 3, the temperature information is transmitted to the variable frequency water pump controller, the variable frequency water pump controller reduces the working frequency of the variable frequency water pump 4, slows down the water circulation, prolongs the heating time of the water in the air-water heat exchanger 2, further improves the temperature of the water flowing out, and meets the heat supply requirement of the waste heat utilization equipment 3; when the temperature of the water flowing out of the air-water heat exchanger 2 measured by the thermometer 8 is higher than the heat supply requirement of the waste heat utilization equipment 3, temperature information is transmitted to the variable-frequency water pump controller, the variable-frequency water pump controller improves the working frequency of the variable-frequency water pump 4, accelerates the circulation of water, shortens the heating time of water in the air-water heat exchanger 2, further reduces the temperature of the water flowing out, and achieves the heat supply requirement of the waste heat utilization equipment 3.
The water in the loop can generate vaporization phenomenon under the environment of 130-150 ℃, in order to ensure that the water in the loop is not vaporized, an automatic pressure stabilizing control device 6 is arranged on a loop pipeline between the variable-frequency water pump 4 and the waste heat utilization device 3, the automatic pressure stabilizing control device 6 comprises a water supplementing device, a pressure relief device, a water storage device and a pressure detection device, the pressure detection device is connected with the loop pipeline, the loop pipeline is also communicated with the water storage device, the water storage device is also connected with the water supplementing device and the pressure relief device, and the pressure detection device is also connected with the water supplementing device and the pressure relief device.
When the pressure detection device in the automatic pressure stabilizing control equipment 6 detects that the pressure of the water in the loop pipeline is higher than a fixed pressure value, information is transmitted to the pressure relief device, and the pressure relief device discharges the water in the loop pipeline to the water storage device, so that the pressure of the water in the loop is reduced; when the pressure detection device in the automatic pressure stabilizing control equipment 6 detects that the pressure of the water in the loop pipeline is lower than the fixed pressure value, information is transmitted to the water supplementing device at the moment, and the water in the water storage device is injected into the loop pipeline by the water supplementing device, so that the pressure of the water in the loop is increased, and the water in the loop is prevented from vaporizing.
In the actual operation process, when the heat provided by the flue gas of the annealing furnace cannot meet the heat supply requirement of the waste heat utilization device 1, the auxiliary heating device 7 is required to ensure the heat supply requirement of the waste heat utilization device 1 by providing steam heat. The waste heat utilization device 1 comprises an air-water/air-steam combined heat exchanger, a steam flow controller and a temperature detection device, wherein the steam flow controller is connected with a steam valve of the combined heat exchanger, the steam flow controller is also connected with the temperature detection device, and a steam outlet and a steam inlet of the auxiliary heating device 7 are connected with a steam inlet and a steam outlet of the combined heat exchanger. When the heat supply temperature of the waste heat utilization device 1 measured by the temperature detection device is lower than a set value, the measured information is transmitted to a steam flow controller, the steam flow controller controls the opening of a steam valve of the combined heat exchanger, and then the steam supply quantity of the auxiliary heating device 7 is regulated, and the steam meets the heat supply requirement of the waste heat utilization device 1 by utilizing a gas-steam heat exchange function in the combined heat exchanger.
In summary, according to the flue gas waste heat utilization system of the annealing furnace, most of heat in flue gas generated by steel rolling in the annealing furnace is recycled after the treatment of the invention, so that the emission of pollutants is reduced, the pollution to the environment is lightened, and the cost of flue gas emission is reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An annealing furnace flue gas waste heat utilization system which is characterized in that: the system comprises waste heat recovery equipment, wherein the waste heat recovery equipment comprises an air-water heat exchanger, the air-water heat exchanger is arranged on a flue gas discharge channel, a water inlet and a water outlet of the air-water heat exchanger are respectively connected with waste heat utilization equipment to form a loop, and water circulation equipment is arranged in the loop.
2. The annealing furnace flue gas waste heat utilization system according to claim 1, wherein: the water circulation device comprises a water pump which is connected in series on a loop pipeline between the air-water heat exchanger and the waste heat utilization device, and the water pump is a variable-frequency water pump.
3. The annealing furnace flue gas waste heat utilization system according to claim 1, wherein: the water circulation device further comprises a variable-frequency water pump controller, a thermometer and a flowmeter, wherein the thermometer and the flowmeter are arranged at the water outlet of the air-water heat exchanger and are connected with the variable-frequency water pump controller, and the variable-frequency water pump controller is further connected with the variable-frequency water pump.
4. The annealing furnace flue gas waste heat utilization system according to claim 1, wherein: the waste heat utilization equipment comprises an air-water/air-steam combined heat exchanger, a steam flow controller and a temperature detection device, wherein a water inlet and a water outlet of the combined heat exchanger are respectively connected with the air-water heat exchanger to form a loop, the steam flow controller is connected with a steam valve of the combined heat exchanger, and the steam flow controller is also connected with the temperature detection device.
5. The annealing furnace flue gas waste heat utilization system according to claim 1, wherein: the system also comprises auxiliary heating equipment, and a steam outlet and a steam inlet of the auxiliary heating equipment are respectively connected with a steam inlet and a steam outlet of the combined heat exchanger.
6. The annealing furnace flue gas waste heat utilization system according to claim 1, wherein: an automatic voltage stabilizing control device is arranged in the loop between the water circulation device and the waste heat utilization device.
7. The annealing furnace flue gas waste heat utilization system according to claim 1, wherein: the automatic voltage stabilizing control equipment comprises a water supplementing device, a pressure relief device, a water storage device and a pressure detection device, wherein the pressure detection device is connected with a loop pipeline, the loop pipeline is further connected with the water storage device, the water storage device is further connected with the water supplementing device and the pressure relief device, and the pressure detection device is further connected with the water supplementing device and the pressure relief device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311676143.XA CN117606253A (en) | 2023-12-08 | 2023-12-08 | Flue gas waste heat utilization system of annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311676143.XA CN117606253A (en) | 2023-12-08 | 2023-12-08 | Flue gas waste heat utilization system of annealing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117606253A true CN117606253A (en) | 2024-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311676143.XA Pending CN117606253A (en) | 2023-12-08 | 2023-12-08 | Flue gas waste heat utilization system of annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117606253A (en) |
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2023
- 2023-12-08 CN CN202311676143.XA patent/CN117606253A/en active Pending
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