CN220288259U - Device for cooling and waste heat recovery of high-temperature pellets of rotary hearth furnace - Google Patents
Device for cooling and waste heat recovery of high-temperature pellets of rotary hearth furnace Download PDFInfo
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- CN220288259U CN220288259U CN202321624381.1U CN202321624381U CN220288259U CN 220288259 U CN220288259 U CN 220288259U CN 202321624381 U CN202321624381 U CN 202321624381U CN 220288259 U CN220288259 U CN 220288259U
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- cooling
- waste heat
- temperature
- rotary hearth
- hearth furnace
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- 238000001816 cooling Methods 0.000 title claims abstract description 164
- 239000008188 pellet Substances 0.000 title claims abstract description 85
- 239000002918 waste heat Substances 0.000 title claims abstract description 69
- 238000011084 recovery Methods 0.000 title claims abstract description 36
- 239000000498 cooling water Substances 0.000 claims abstract description 85
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 239000008234 soft water Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 16
- 239000002699 waste material Substances 0.000 abstract description 7
- 230000001502 supplementing effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model discloses a device for cooling high-temperature pellets and recovering waste heat of a rotary hearth furnace, wherein equipment comprises a primary cooling device, a secondary cooling device, a waste heat boiler system, a soft water supply system, a detection and regulation system and a control system. The utility model adopts two-stage cooling and two-stage heat energy recovery modes to recover the heat energy released by the high-temperature pellets, and simultaneously can recycle the cooling water used in the heat energy recovery process, thereby solving the problems of heat loss, resource waste and the like in the high-temperature pellet cooling process.
Description
Technical Field
The utility model belongs to the technical field of heat energy recovery of rotary hearth furnaces, and particularly relates to a device for cooling high-temperature pellets and recovering waste heat of a rotary hearth furnace.
Background
The direct reduction process of the rotary hearth furnace is widely applied in the ferrous metallurgy industry due to the unique advantages in the aspect of treating zinc-containing and iron-containing metallurgical dust; the temperature of the metallized pellets discharged from the rotary hearth furnace is about 1100 ℃, and the metallized pellets need to be cooled to a proper temperature to meet the requirements of subsequent conveying and warehouse entry storage, wherein the high-temperature pellets emit a large amount of heat in the cooling process, so that the heat energy released by the high-temperature pellets is wasted for a long time, and the heat energy recovery is always blank in the production process of the rotary hearth furnace.
The rotary hearth furnace high-temperature pellets are always cooled by adopting an external spray cylinder cooler, one part of the cooled industrial water is changed into etching water after heat exchange with high-temperature materials, the other part of the cooled industrial water is changed into water vapor to be directly discharged into the atmosphere, and the waste of energy and resources is caused.
In view of the above, a heat energy recovery device is to be studied urgently, and the heat energy released by the high-temperature pellets is comprehensively recovered and utilized, so that the waste of water resources can be reduced, and the problems of heat loss, resource waste and the like in the cooling process of the high-temperature pellets are solved.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a device for cooling and waste heat recovery of the high-temperature pellets of the rotary hearth furnace, which adopts a two-stage cooling and two-stage heat energy recovery mode to recover heat energy released by the high-temperature pellets, and simultaneously can also utilize cooling water used in the heat energy recovery process, thereby solving the problems of heat loss, resource waste and the like in the cooling process of the high-temperature pellets.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a device for cooling and recovering waste heat of high-temperature pellets of a rotary hearth furnace, which comprises
The primary cooling device is used for primary cooling of the high-temperature pellets discharged by the rotary hearth furnace so as to reduce the temperature of the high-temperature pellets; the primary cooling device comprises a first cooling cylinder body connected with a pellet outlet of the rotary hearth furnace and a first cooling water loop arranged in the first cooling cylinder body;
the secondary cooling device is used for performing secondary cooling on the pellets subjected to primary cooling; the secondary cooling device comprises a second cooling cylinder body connected with the outlet of the first cooling cylinder body and a second cooling water loop arranged in the second cooling cylinder body;
the waste heat boiler system is used for recovering steam from the primary cooling device and high-temperature water from the secondary cooling device and simultaneously providing cooling water for the primary cooling device and the waste heat boiler tube bundle;
a soft water supply system for supplying cooling water to the secondary cooling device, the soft water supply system being connected with a water inlet of the second cooling water circuit;
the detection and regulation system is used for detecting and regulating the temperature, pressure and flow of the water at the inlet and outlet of the cooling water loop of the primary cooling device and the cooling water loop of the secondary cooling device in real time;
and the control system receives the detection data of the detection and regulation system and performs chain control and remote management on the operation of the primary cooling device, the secondary cooling device, the waste heat boiler system and the soft water supply system.
Preferably, the inlet of the first cooling water loop is connected with the water outlet of the deaerator of the waste heat boiler system, and the outlet of the first cooling water loop is connected with the steam drum of the waste heat boiler system.
Preferably, the first cooling water circuit is formed by a plurality of first cooling water bundles.
Preferably, the inlet of the second cooling water loop is connected with the soft water supply system, and the outlet of the second cooling water loop is connected with the deaerator of the waste heat boiler system.
Preferably, the second cooling water circuit is formed by a plurality of second cooling water bundles.
Preferably, the detection and regulation system comprises a detection unit and a regulation unit connected with the detection unit; the detection unit comprises a thermometer, a pressure gauge and a flowmeter which are respectively arranged at the inlet and the outlet of the first cooling water loop and the second cooling water loop; the regulating and controlling unit is respectively connected with the primary cooling device, the secondary cooling device, the waste heat boiler system and the soft water supply system, and the regulating and controlling unit respectively regulates and controls security parameters in the primary cooling device, the secondary cooling device, the waste heat boiler system and the soft water supply system according to detection data of the detection unit.
The utility model has the beneficial effects that:
1. according to the device for cooling and waste heat recovery of the high-temperature pellets of the rotary hearth furnace, waste heat recovery of the high-temperature pellets of the rotary hearth furnace is realized for the first time, the heat recovery rate is more than 85%, cooling water used in the waste heat recovery process can be recycled, no steam is discharged, and the device is energy-saving and environment-friendly;
2. according to the device for cooling the high-temperature pellets and recovering the waste heat of the rotary hearth furnace, the cooling of high-temperature materials is divided into two stages, the first stage cooling is used for generating steam for the boiler, the second stage cooling is used for generating supplementing water with proper temperature for the water supplementing heating section of the boiler, and the steam consumption in the boiler system is reduced; the two-stage cooling mode is adopted to realize the comprehensive recycling of the heat of the high-temperature pellets, so that the production energy consumption is further reduced;
3. the device for cooling the high-temperature pellets of the rotary hearth furnace and recovering the waste heat has the advantages that the cooling and the heat recovery of the high-temperature pellets of the rotary hearth furnace are taken into consideration, no new steam generating device is added, the waste heat boiler system of the rotary hearth furnace is fully utilized for heat recovery and utilization, and the whole heat recovery process is simple and practical and has small investment;
4. the device for cooling and waste heat recovery of the rotary hearth furnace high-temperature pellets utilizes the water supplement of the rotary hearth furnace waste heat boiler as the cooling water of the high-temperature pellets, fully utilizes water resources in the rotary hearth furnace process, and is a great progress in the utilization of the rotary hearth furnace process water resources;
5. the device for cooling the high-temperature pellets and recovering the waste heat of the rotary hearth furnace adopts closed circulation, and the cooling medium is utilized layer by layer in the heating process, so that the resource waste is avoided;
6. the device for cooling the high-temperature pellets and recovering the waste heat of the rotary hearth furnace has the advantages of high heat recovery and utilization rate and good pellet cooling effect.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural view of an apparatus for cooling and recovering waste heat of high temperature pellets of a rotary hearth furnace according to the present utility model;
fig. 2 is a schematic flow chart of a method for cooling and waste heat recovery of rotary hearth furnace high temperature pellets according to the present utility model.
Detailed Description
In order to better understand the above technical solution of the present utility model, the technical solution of the present utility model is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the waste heat recovery device for cooling the high-temperature pellets of the rotary hearth furnace provided by the utility model comprises a primary cooling device 1, a secondary cooling device 2, a waste heat boiler system 4, a soft water supply system 5, a detection and regulation system 3 and a control system 6. The primary cooling device 1 is used for primary cooling of the high-temperature pellets discharged by the rotary hearth furnace 7 so as to reduce the temperature of the high-temperature pellets; the primary cooling device 1 comprises a first cooling cylinder connected with a pellet outlet of the rotary hearth furnace 7 and a first cooling water loop arranged in the first cooling cylinder; the high-temperature pellets enter a first cooling cylinder of the primary cooling device 1, and heat exchange is carried out between the high-temperature pellets and cooling water in a first cooling water loop in the rotation process of the first cooling cylinder, so that primary cooling of the high-temperature pellets is completed. The secondary cooling device 2 is used for performing secondary cooling on the pellets subjected to primary cooling; the secondary cooling device 2 comprises a second cooling cylinder body connected with the outlet of the first cooling cylinder body and a second cooling water loop arranged in the second cooling cylinder body; the medium-temperature pellets after the first-stage cooling enter a second cooling cylinder of the second-stage cooling device 2, and the pellets continue to exchange heat with cooling water in a second cooling water loop in the rotation process of the second cooling cylinder, so that the second-stage cooling of the high-temperature pellets is completed. The waste heat boiler system 4 is used for recovering steam from the primary cooling device 1 and warming hot water from the secondary cooling device 2, and simultaneously providing a part of warming hot water as cooling water for the primary cooling device 1. The soft water supply system 5 is used for supplying normal-temperature soft water to the secondary cooling device 2 as cooling water, and the soft water supply system 5 is connected with the water inlet of the second cooling water loop. The detection and control system 3 is used for detecting and controlling the temperature, pressure and flow of the water at the inlet and outlet of the cooling water loop of the primary cooling device 1 and the secondary cooling device 2 in real time. The control system 6 receives the data detected by the detection and regulation system 3, carries out linkage control and remote management on the operation conditions of the primary cooling device 1, the secondary cooling device 2, the waste heat boiler system 4 and the soft water supply system 5, and realizes unattended remote linkage control.
In the primary cooling device 1, a feed inlet of the first cooling cylinder is connected with a pellet discharge port of the rotary hearth furnace through a chute.
In the primary cooling device 1, a first cooling water loop is formed by a plurality of first cooling water pipe bundles, and an inlet of the first cooling water loop is connected with a water outlet of a deaerator 42 of the waste heat boiler system 4 so that the waste heat boiler system 4 can provide cooling water for the primary cooling device 1; the outlet of the first cooling water circuit is connected with the steam drum 41 of the waste heat boiler system 4, so that supersaturated hot water from the first cooling water circuit enters the steam drum 41, and steam is produced for recovery.
In the secondary cooling device 2, the feed inlet of the second cooling cylinder is connected with the discharge outlet of the first cooling cylinder through a chute.
In the secondary cooling device 2, a second cooling water loop is formed by a plurality of second cooling water pipe bundles, an inlet of the second cooling water loop is connected with a soft water supply system 5, and cooling water required by secondary cooling is provided for the secondary cooling system through the soft water supply system 5; the outlet of the second cooling water loop is connected with the water inlet of the deaerator 42 of the waste heat boiler system 4, so that the warmed hot water coming out of the second cooling water loop enters the waste heat boiler system 4 and is used as the supplementing water of the boiler tube bundle of the waste heat boiler and the cooling water required by primary cooling.
The detection and regulation system 3 comprises a detection unit and a regulation unit connected with the detection unit; the detection unit comprises a thermometer, a pressure gauge and a flowmeter which are respectively arranged at the inlet and the outlet of the first cooling water loop and the second cooling water loop and is used for detecting the temperature, the pressure and the flow of the inlet and the outlet of the first cooling water loop and the second cooling water loop; the regulating and controlling unit is respectively connected with the primary cooling device 1, the secondary cooling device 2, the waste heat boiler system 4 and the soft water supply system 5, and the regulating and controlling unit respectively regulates and controls the operation parameters of the primary cooling device 1, the secondary cooling device 2, the waste heat boiler system 4 and the soft water supply system 5 according to the detection data of the detection unit; the regulating and controlling unit regulates and controls the pellet quantity of the rotary hearth furnace 7 and the cooling water quantity of the water supply system 5 according to the temperature of the water inlet and outlet detected by the thermometer, thereby realizing the regulation and control of the temperature and flow of the water inlet and outlet of the primary cooling device 1 and the secondary cooling device 2; the water supply pressure of the waste heat boiler system 4 and the soft water supply system 5 is regulated and controlled according to the pressure data detected by the pressure gauge, so that the regulation and control of the inlet and outlet water pressure of the primary cooling device 1 and the secondary cooling device 2 are realized.
With reference to fig. 2, a method for cooling and recovering waste heat of high-temperature pellets of a rotary hearth furnace is mainly divided into two working paths of high-temperature pellet cooling and cooling water heating and heat recovery; the method for cooling the high-temperature pellets of the rotary hearth furnace and recovering the waste heat adopts the device for cooling the high-temperature pellets of the rotary hearth furnace and recovering the waste heat to execute the following steps:
s1, cooling high-temperature pellets, wherein the high-temperature pellets of a rotary hearth furnace 7 are discharged into a cylinder of a primary cooling device 1 by the rotary hearth furnace 7 to be subjected to primary cooling, and the high-temperature pellets exchange heat with cooling water in the primary cooling device 1 in the rotation process of the cylinder; and then discharging the medium-temperature pellets subjected to the primary cooling into a barrel of a secondary cooling device 2 for secondary cooling, continuously performing heat exchange with cooling water in the secondary cooling device 2 in the barrel rotation process, and discharging the pellets after the pellets are cooled to below 100 ℃;
specifically, after being discharged from the rotary hearth furnace 7, the high-temperature pellets at about 1100 ℃ enter a first cooling cylinder of the primary cooling device 1 through a chute, heat exchange is carried out between the high-temperature pellets and cooling water in a first cooling water loop in the rotation process of the first cooling cylinder, medium-temperature pellets with the temperature of about 800 ℃ are obtained after the temperature of the high-temperature pellets is reduced, then the medium-temperature pellets are discharged into a feed inlet of the secondary cooling device 2 through a discharge port chute, the water heat exchange is continuously carried out in the cylinder of the secondary cooling device 2, and when the pellets are cooled to below 100 ℃, the pellets are discharged from a discharge end, and then enter a finished product bin through a conveying facility for storage or direct delivery.
S2, waste heat recovery, wherein cooling water used in the secondary cooling process exchanges heat with the medium-temperature pellets, warmed hot water after warming enters into a deaerator 42 of the waste heat boiler system 4, one part of the warmed hot water is used as supplementing water of the waste heat boiler, the other part of the warmed hot water is used as cooling water for primary cooling and enters into the primary cooling device 1 to exchange heat with the high-temperature pellets, supersaturated hot water is formed after warming and enters into a steam drum 41 of the waste heat boiler system 4, and produced steam is recovered.
Specifically, about 30 ℃ of cooling water is sent into a second cooling water loop of the secondary cooling device 2 by a pump station and a pipeline in the soft water supply system 5, heat exchange is carried out on the cooling water and the intermediate-temperature pellets with the temperature of about 800 ℃, after the temperature-rising hot water with the temperature of the cooling water being higher than 100 ℃ enters a deaerator of the waste heat boiler system 4 for treatment, one part of the cooling water is taken as supplementing water of a boiler tube bundle of the waste heat boiler, the other part of the cooling water enters the primary cooling device 1 as cooling water, heat exchange is carried out on the cooling water and the high-temperature pellets with the temperature of about 1100 ℃, the temperature of the cooling water in the first cooling water loop is higher than 200 ℃ to form supersaturated hot water, and the supersaturated hot water enters a steam drum 41 of the waste heat boiler system 4, and steam is produced for recovery.
The device for cooling and waste heat recovery of the high-temperature pellets of the rotary hearth furnace can be used for cooling and heat recovery of the high-temperature pellets of the rotary hearth furnace, and can also be used for cooling and waste heat recovery of other solid pellet high-temperature materials similar to the high-temperature pellets.
According to the device for cooling the high-temperature pellets and recovering the waste heat of the rotary hearth furnace, the cooling of the high-temperature pellets and the recovery and utilization of the waste heat of the rotary hearth furnace are realized for the first time, wherein the heat recovery rate can reach more than 85%, the used cooling water can be recycled, and no steam is discharged in the whole process, so that the device is energy-saving and environment-friendly; in addition, the high-temperature materials are cooled in two stages, supersaturated hot water after primary cooling enters a boiler to produce steam, and the high-temperature water after secondary cooling enters a boiler deaerator to be used as boiler supplementing water, so that steam consumption in a waste heat boiler system is reduced; the comprehensive recycling of the heat of the high-temperature pellets is realized through two-stage cooling, so that the production energy consumption is further reduced; in addition, the cooling device adopts closed circulation, and the cooling medium (cooling water) is utilized layer by layer in the heating process, so that the resource waste can be effectively avoided.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the utility model, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the utility model as long as they fall within the true spirit of the utility model.
Claims (6)
1. A device for cooling of rotary hearth furnace high temperature pellet and waste heat recovery, characterized by comprising
The primary cooling device is used for primary cooling of the high-temperature pellets discharged by the rotary hearth furnace so as to reduce the temperature of the high-temperature pellets; the primary cooling device comprises a first cooling cylinder body connected with a pellet outlet of the rotary hearth furnace and a first cooling water loop arranged in the first cooling cylinder body;
the secondary cooling device is used for performing secondary cooling on the pellets subjected to primary cooling; the secondary cooling device comprises a second cooling cylinder body connected with the outlet of the first cooling cylinder body and a second cooling water loop arranged in the second cooling cylinder body;
the waste heat boiler system is used for recovering steam from the primary cooling device and high-temperature water from the secondary cooling device and simultaneously providing cooling water for the primary cooling device and the waste heat boiler tube bundle;
a soft water supply system for supplying cooling water to the secondary cooling device, the soft water supply system being connected with a water inlet of the second cooling water circuit;
the detection and regulation system is used for detecting and regulating the temperature, pressure and flow of the water at the inlet and outlet of the cooling water loop of the primary cooling device and the cooling water loop of the secondary cooling device in real time;
and the control system receives the detection data of the detection and regulation system and performs chain control and remote management on the operation of the primary cooling device, the secondary cooling device, the waste heat boiler system and the soft water supply system.
2. The device for cooling and waste heat recovery of high-temperature pellets of a rotary hearth furnace according to claim 1, wherein: the inlet of the first cooling water loop is connected with the water outlet of the deaerator of the waste heat boiler system, and the outlet of the first cooling water loop is connected with the steam drum of the waste heat boiler system.
3. The apparatus for cooling and waste heat recovery of rotary hearth furnace high temperature pellets according to claim 2, wherein the first cooling water circuit is formed of a plurality of first cooling water pipe bundles.
4. The device for cooling and waste heat recovery of high-temperature pellets of a rotary hearth furnace according to claim 1, wherein: and an inlet of the second cooling water loop is connected with the soft water supply system, and an outlet of the second cooling water loop is connected with the deaerator of the waste heat boiler system.
5. The device for cooling and waste heat recovery of high-temperature pellets of a rotary hearth furnace according to claim 4, wherein: the second cooling water circuit is formed by a plurality of second cooling water pipe bundles.
6. The device for cooling and waste heat recovery of high-temperature pellets of a rotary hearth furnace according to claim 1, wherein the detection and control system comprises a detection unit and a control unit connected with the detection unit; the detection unit comprises a thermometer, a pressure gauge and a flowmeter which are respectively arranged at the inlet and the outlet of the first cooling water loop and the second cooling water loop; the regulating and controlling unit is respectively connected with the primary cooling device, the secondary cooling device, the waste heat boiler system and the soft water supply system, and the regulating and controlling unit respectively regulates and controls security parameters of the primary cooling device, the secondary cooling device, the waste heat boiler system and the soft water supply system according to detection data of the detection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321624381.1U CN220288259U (en) | 2023-06-26 | 2023-06-26 | Device for cooling and waste heat recovery of high-temperature pellets of rotary hearth furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321624381.1U CN220288259U (en) | 2023-06-26 | 2023-06-26 | Device for cooling and waste heat recovery of high-temperature pellets of rotary hearth furnace |
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| Publication Number | Publication Date |
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| CN220288259U true CN220288259U (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321624381.1U Active CN220288259U (en) | 2023-06-26 | 2023-06-26 | Device for cooling and waste heat recovery of high-temperature pellets of rotary hearth furnace |
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| Country | Link |
|---|---|
| CN (1) | CN220288259U (en) |
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2023
- 2023-06-26 CN CN202321624381.1U patent/CN220288259U/en active Active
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