CN114812203A - Waste heat recovery device and recovery method based on heat conduction particle enhanced heat transfer - Google Patents
Waste heat recovery device and recovery method based on heat conduction particle enhanced heat transfer Download PDFInfo
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- CN114812203A CN114812203A CN202210308839.6A CN202210308839A CN114812203A CN 114812203 A CN114812203 A CN 114812203A CN 202210308839 A CN202210308839 A CN 202210308839A CN 114812203 A CN114812203 A CN 114812203A
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- heat
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- heat exchange
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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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0286—Cooling in a vertical, e.g. annular, shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F2013/001—Particular heat conductive materials, e.g. superconductive elements
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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
Abstract
The invention provides a waste heat recovery device and a recovery method based on heat conduction particle enhanced heat transfer, wherein the waste heat recovery device is configured to introduce heat conduction particles into a heat exchange bin (1) so as to enhance local heat exchange in the heat exchange bin (1). The heat exchange chamber (1) comprises: a housing; the sinter feed inlet (2) is arranged on the shell; a sinter discharger (3) positioned at the bottom of the shell; and at least one heat exchange device arranged in the shell, wherein the waste heat recovery device further comprises a particle supply unit (7), and the particle supply unit (7) is arranged in the middle or on the lower part of the shell of the heat exchange bin (1) and is used for providing heat conducting particles into the heat exchange bin (1). The waste heat recovery device and the recovery method based on heat conduction particle enhanced heat transfer can enhance the heat transfer between the low-temperature sintering ore and the heating surface pipeline, improve the heat transfer coefficient of the low-temperature section and improve the waste heat recovery efficiency of the sintering ore.
Description
Technical Field
The invention relates to the field of metallurgy or heat energy, in particular to efficient recovery and utilization of waste heat resources in a metallurgy process, and specifically relates to a waste heat recovery device and a recovery method based on heat conduction particle enhanced heat transfer.
Background
The steel production in China is mainly based on a long-flow production process of a blast furnace and a converter, and the proportion of converter steel reaches more than 90%. The sintering process is a process of mixing various powdery iron-containing raw materials with a certain proportion of fuel and solvent before blast furnace ironmaking production, burning the mixture on a sintering machine trolley, and sintering the mixture into blocks through a series of physical and chemical changes. The waste heat resources in the sintering process mainly comprise the sensible heat of finished sintered ore and the sensible heat of flue gas of the sintering machine, and the sensible heat carried by the sintered ore before cooling is about 44.5 percent of the total heat expenditure.
At present, the traditional circular cooler or vertical pot furnace is generally adopted for cooling the sinter in China and even in the world. The waste heat recovery process of the circular cooler generally has the obvious defects of high air leakage rate, difficult waste heat recovery at a low-temperature section and the like, so that the overall waste heat recovery efficiency is low. The vertical tank furnace solves the problems of the circular cooler, and has the advantages of low air leakage rate, high hot air temperature, low dust discharge and the like, however, the air passes through a thick material layer in the heat exchange process in the vertical tank furnace, so that the flow resistance of the air is very high, and the problems of high self-power consumption and low external power supply capacity of the system are further caused.
Aiming at the problems of the circular cooler and the vertical tank furnace, in recent years, a technology of vertical solid heat exchange waste heat recovery is developed and improved, heat exchange is directly carried out between the sintered ore and a heating surface pipeline arranged in a heat exchanger, the waste heat recovery efficiency of the sintered ore is improved, and the power consumption of the waste heat recovery process is reduced. However, the heat transfer coefficient of the direct heat exchange between the sintered ore and the heating surface pipeline is greatly influenced by the temperature of the sintered ore, and the heat transfer coefficient is greatly reduced along with the reduction of the temperature of the sintered ore.
In order to further improve the waste heat recovery efficiency and strengthen the heat transfer coefficient of the low-temperature sintering ore, the design method of the scheme is provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art at least partially and provides a waste heat recovery device and a recovery method based on heat conduction particle enhanced heat transfer.
The invention also aims to provide a waste heat recovery device and a recovery method based on heat conduction particle enhanced heat transfer, and the problem of low heat transfer coefficient of a low-temperature section is solved.
The invention also aims to provide a waste heat recovery device and a recovery method based on heat conduction particle enhanced heat transfer, which have improved waste heat recovery efficiency.
To achieve one of the above objects or purposes, the technical solution of the present invention is as follows:
the waste heat recovery device comprises a heat exchange bin for receiving the sintered ore, and the waste heat recovery device is configured to introduce heat-conducting particles into the heat exchange bin so as to strengthen local heat exchange in the heat exchange bin.
According to a preferred embodiment of the invention, the heat exchange chamber comprises:
a housing;
the sinter feed inlet is arranged on the shell;
the sinter discharger is positioned at the bottom of the shell; and
at least one heat exchange device disposed within the housing,
the waste heat recovery device further comprises a particle supply unit, wherein the particle supply unit is arranged in the middle or on the lower portion of the shell of the heat exchange bin and used for providing heat conduction particles for the heat exchange bin.
According to a preferred embodiment of the present invention, the particle supply unit comprises a particle distribution pipe extending into the housing from a middle or lower portion of the housing;
and a plurality of falling holes are uniformly formed in the particle distributing pipe.
According to a preferred embodiment of the invention said particle distribution pipe is placed obliquely in relation to the horizontal plane so that the heat conducting particles can slide along the particle distribution pipe under the influence of gravity and fall substantially evenly through the drop opening.
According to a preferred embodiment of the present invention, the number of particle distribution pipes is plural, the plural particle distribution pipes are disposed obliquely at the same angle with respect to the horizontal plane, the ends of the plural particle distribution pipes located in the heat exchange chamber intersect at a point, and the vertical projections of the plural particle distribution pipes on the horizontal plane are uniformly distributed in the circumferential direction.
According to a preferred embodiment of the present invention, said at least one heat exchange device comprises more than two heat exchange devices, said particle distribution pipe being arranged between two adjacent heat exchange devices.
According to a preferred embodiment of the invention, the at least one heat exchange device comprises a superheater, an evaporator and an economizer.
According to a preferred embodiment of the present invention, the housing includes:
a first stage;
the second section is positioned above the first section, and the diameter of the second section is larger than that of the first section; and
a tapered section connecting the first section and the second section, the diameter of the tapered section gradually decreases along the vertical downward direction,
the particle supply unit includes a particle introduction pipe disposed above the tapered section of the housing, communicating with the interior of the housing.
According to a preferred embodiment of the present invention, the particle introduction tube is placed obliquely with respect to a horizontal plane and is substantially parallel to the inclined side surface of the tapered section.
According to a preferred embodiment of the present invention, the waste heat recovery device further includes:
a screen plate disposed at a lower side of the sinter discharger and placed slantingly;
the particle collecting hopper is arranged below the sieve plate and covered by the sieve plate;
the particle discharge port is arranged at one end of the particle collecting hopper far away from the sieve plate; and
a sinter ore discharge port arranged at the side of the particle collecting hopper,
wherein, the line between the highest point and the lowest point of the sieve plate is approximately directed to the sinter ore discharge port.
According to a preferred embodiment of the present invention, the waste heat recovery apparatus further comprises a transport duct connected to the particle discharge port and the particle supply unit for transporting the thermally conductive particles discharged from the particle discharge port to the particle supply unit.
According to a preferred embodiment of the invention, the at least one heat exchange device comprises more than two heat exchange devices, one heat exchange device being arranged in the first section and one heat exchange device being arranged in the second section.
According to another aspect of the invention, a waste heat recovery method based on heat conduction particle enhanced heat transfer is provided, and the waste heat recovery method adopts the waste heat recovery device based on heat conduction particle enhanced heat transfer according to any one of the previous embodiments.
According to a preferred embodiment of the present invention, the waste heat recovery method includes:
supplying the sintered ore into the heat exchange bin through a sintered ore feed inlet;
heat conducting particles are supplied to the heat exchange bin through the particle supply unit;
recovering the heat of the sinter by utilizing heat exchange equipment in the heat exchange bin;
discharging the sintered ore and heat conducting particles after heat exchange by using a sintered ore discharger;
separating the sintered ore and the heat conducting particles by using a sieve plate;
collecting the heat conducting particles separated by the sieve plate and sending the heat conducting particles back to the particle supply unit; and
and discharging the separated sinter.
According to the waste heat recovery device and the recovery method based on heat conduction particle enhanced heat transfer, the heat conduction particles are introduced into the middle or the lower part of the shell of the heat exchange bin, and the heat conduction particles with fine particle sizes are doped into the sintering ore, so that the heat transfer between the low-temperature sintering ore and the heating surface pipeline can be enhanced, the heat transfer coefficient of a low-temperature section is improved, and the waste heat recovery efficiency of the sintering ore is improved.
Drawings
FIG. 1 is a graph schematically illustrating the relationship between sinter temperature and heat transfer coefficient;
FIG. 2 is a graph schematically showing the relationship between the sintered ore particle size and the heat transfer coefficient;
FIG. 3 is a graph schematically showing the relationship between the fine particle incorporation ratio and the heat transfer coefficient;
FIG. 4 is a schematic structural diagram of a waste heat recovery device based on heat conduction particle enhanced heat transfer according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a waste heat recovery device based on heat conduction particle enhanced heat transfer according to another embodiment of the invention; and
fig. 6 is a flowchart of a method for recovering waste heat based on heat conducting particles to enhance heat transfer according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will hereinafter be described in detail with reference to the accompanying drawings, wherein like or similar reference numerals denote like or similar elements. Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
Fig. 1 exemplarily shows the relationship between the temperature of the sintered ore and the heat transfer coefficient, and the lower the temperature of the sintered ore, the lower the heat transfer coefficient, which means that in the vertical solid heat exchange technology, in the heat exchange bin, the heat of the sintered ore is gradually exchanged to the heat exchange device along with the falling direction of the sintered ore, the temperature of the sintered ore is gradually decreased, and then in the lower position of the heat exchange bin, the temperature of the sintered ore is lower, and the heat transfer coefficient is not high.
In addition, in a solid-solid heat exchange system, the heat exchange properties of solid materials with different particle sizes on a heating surface are different. In the vertical solid heat exchange technology, the larger the particle size of the sintered ore, the smaller the heat transfer coefficient thereof, and the typical relationship between the particle size of the sintered ore and the heat transfer coefficient is shown in fig. 2, which means that the sintered ore with a lower particle size has a higher heat exchange efficiency and a higher waste heat recovery efficiency.
In order to increase the heat exchange efficiency at the lower part of the heat exchange bin, the invention provides a heat recovery device based on heat conduction particle enhanced heat transfer. The heat transfer between the low-temperature sintering ore and the heating surface pipeline is enhanced through the introduced heat conducting particles. Fig. 3 exemplarily shows the relationship between the fine particle incorporation ratio and the heat transfer coefficient, and the heat transfer coefficient of the low-temperature sintered ore increases as the fine particle incorporation ratio increases. The heat conducting particles can adopt metal particles with proper particle size, and the particle size of the metal particles is far smaller than that of the sintered ore.
Fig. 4 is a schematic structural diagram of a waste heat recovery device based on heat conduction particle enhanced heat transfer according to an embodiment of the present invention, as shown in fig. 4, the waste heat recovery device includes a heat exchange bin 1 for receiving sintered ore, the heat exchange bin 1 includes: a housing having a substantially square cylindrical shape, an upper end and a lower end having tapered portions; a sinter feed port 2 provided at the upper end of the casing, alternatively, it may be provided on the side of the casing as long as it is located at the upper position of the test; a sinter discharger 3 located at the bottom of the casing, on the tapered section of the bottom; and a plurality of heat exchange devices disposed in the case, the plurality of heat exchange devices including a superheater 4, an evaporator 5, and an economizer 6, which are sequentially disposed from top to bottom. The waste heat recovery device further comprises a particle supply unit 7, wherein the particle supply unit 7 is arranged in the middle of the shell of the heat exchange bin 1 and used for providing heat conduction particles for the heat exchange bin 1. In other embodiments, the particle supply unit 7 may be disposed on a lower portion of the housing of the heat exchange bin 1.
In the embodiment of fig. 4, the particle supply unit 7 is a particle distribution pipe extending into the housing from the middle of the housing. In other embodiments, the particle supply unit 7 may extend into the housing from a lower portion of the housing. The particle distribution pipe is uniformly provided with a plurality of falling holes, and is obliquely arranged relative to the horizontal plane, so that the heat conducting particles can slide along the particle distribution pipe under the action of gravity and substantially uniformly fall from the falling holes. The number of the particle distributing pipes can be one or more. In the case of a particle distribution pipe, it extends from side to side in the width direction of the square cylindrical housing, either horizontally or obliquely. In the case of a plurality of particle distribution pipes, which may be placed inclined at the same angle to the horizontal, the ends of the plurality of particle distribution pipes located in the heat transfer silo 1 intersect at a point and the vertical projections of the plurality of particle distribution pipes on the horizontal are distributed uniformly in the depth direction. Thus, in a top view from above, the plurality of particle distribution pipes are evenly distributed within the housing.
The particle distribution pipe is arranged between two adjacent heat exchange devices, for example, as shown in fig. 4, the particle distribution pipe is arranged between the evaporator 5 and the economizer 6. In this way, the heat conductive particles fed from the particle distribution pipe act on the area where the economizer 6 is located, and heat exchange between the sintered ore and the economizer 6 in the area is enhanced.
As shown in fig. 4, the waste heat recovery device further includes: a screen plate 8 disposed at a lower side of the sinter discharger 3 and placed obliquely; a particle collection hopper 9 disposed below the sieve plate 8 and covered by the sieve plate 8; a particle discharge port 10 provided at one end of the particle collection hopper 9 remote from the sieve plate 8; and a sinter discharge port 11 arranged at the side of the particle collecting hopper 9, wherein a connecting line from the highest point to the lowest point of the sieve plate 8 is approximately directed to the sinter discharge port 11. Can separate the sinter after the heat transfer and heat conduction granule through sieve 8, only need control the aperture of sieve 8 can, because the particle diameter of heat conduction granule is less than the particle diameter of sinter, consequently, the heat conduction granule passes sieve 8 and falls into granule collecting hopper 9, then, the heat conduction granule passes through granule discharge port 10 and discharges, and the sinter that does not pass sieve 8 rolls to sinter discharge port 11 department because of the action of gravity, is discharged and is collected.
Preferably, the thermally conductive particles are reusable, and for this purpose, the waste heat recovery apparatus further includes a transfer duct connected to the particle discharge port 10 and the particle supply unit 7 for transferring the thermally conductive particles discharged from the particle discharge port 10 to the particle supply unit 7. A driving unit may be provided on the transport pipe to drive the heat conducting particles to rise to the particle supply unit 7, for example, a screw auger is provided on the transport pipe to push the heat conducting particles to rise.
Advantageously, the particle distribution pipes may be arranged in two layers, each layer of particle distribution pipes comprises a plurality of particle distribution pipes uniformly distributed along the axial direction, and the vertical projection of the first layer of particle distribution pipes in the horizontal plane is mutually staggered with the vertical projection of the second layer of particle distribution pipes in the horizontal plane. Further, in order to avoid clogging of the heat conductive particles in the particle distribution pipes, the plurality of particle distribution pipes in each layer meet at a point at the center of the heat exchange bin, but an open area is provided at the point so that the plurality of particle distribution pipes are joined only at the upper end and the lower end is completely open, so that the heat conductive particles that do not fall through the falling hole are finally conveyed thereto, falling down at the open area.
Fig. 5 is a schematic structural diagram of a waste heat recovery device based on heat conduction particle enhanced heat transfer according to another embodiment of the present invention, which has substantially the same structure as the waste heat recovery device of fig. 4, with the difference that: the shape of the housing and the form of the particle supply unit are different. As shown in fig. 5, the housing has a large top and a small bottom, and includes: a first stage; the second section is positioned above the first section, and the diameter of the second section is larger than that of the first section; and a tapered section connecting the first section and the second section, the diameter of the tapered section gradually decreasing in a vertically downward direction. The particle supply unit 7 includes a particle introduction pipe provided above the tapered section of the housing, communicating with the interior of the housing. The particle introduction pipe is placed obliquely with respect to the horizontal plane and is substantially parallel to the inclined side surface of the tapered section. Since the tapered section has inclined side surfaces, when the particle introduction pipe is disposed above the tapered section of the housing, the heat conductive particles introduced through the particle introduction pipe can be guided by the inclined side surfaces and finally guided to the economizer 6 region. In fig. 5, the plurality of heat exchange devices likewise comprises a superheater 4, an evaporator 5 and an economizer 6, the superheater 4 and the evaporator 5 being arranged in the second section of the housing and the economizer 6 being arranged in the first section of the housing. In this way, the different heat exchange devices are separated by the tapered section and the particles to the inlet. In other embodiments, two heat exchange devices may be provided in the first section and one heat exchange device in the second section, or other combinations of designs. In summary, at least one heat exchange device is provided in the first section and at least one heat exchange device is also provided in the second section.
The number of the particle introducing pipes may be plural, and they are uniformly distributed on the housing. As shown in fig. 5, the plurality of particle introduction tubes are each placed obliquely with respect to the horizontal plane, and the plurality of particle introduction tubes are each directed toward the middle section of the housing, i.e., the longitudinal extensions of the particle introduction tubes on both sides eventually intersect in the middle of the housing.
Advantageously, the plurality of particle introduction tubes are each placed obliquely with respect to the horizontal plane, but the longitudinal extension of the plurality of particle introduction tubes is not directed towards the centre line of the housing, but is offset from the centre line of the housing, and the plurality of particle introduction tubes are tangent to the same cylinder centred on the centre line. It thus appears that the plurality of particle introduction tubes form a spiral around the centre line, through which the thermally conductive particles falling into the first section are distributed helically into the first section.
Otherwise, the embodiment of fig. 5 is substantially the same as the embodiment of fig. 4, and has the same sieve plate 8, particle collecting hopper 9, particle discharge port 10, and sintered ore discharge port 11, so that the heat conductive particles can be recycled as well.
According to another aspect of the invention, a waste heat recovery method based on heat conduction particle enhanced heat transfer is provided, and the waste heat recovery method adopts the waste heat recovery device based on heat conduction particle enhanced heat transfer according to any one of the previous embodiments.
As shown in fig. 6, the waste heat recovery method includes:
supplying the sinter to the heat exchange bin 1 through the sinter feed inlet 2;
heat conducting particles are supplied to the heat exchange bin 1 through a particle supply unit 7;
heat of the sinter is recovered by utilizing heat exchange equipment in the heat exchange bin 1;
discharging the sintered ore and heat conducting particles after heat exchange by using a sintered ore discharger 3;
the sintered ore and the heat conducting particles are separated by using a sieve plate 8;
collecting the thermally conductive particles separated by the sieve plate 8 and returning the thermally conductive particles to the particle supply unit 7; and
and discharging the separated sinter.
According to the waste heat recovery device and the recovery method based on heat conduction particle enhanced heat transfer, the heat conduction particles are introduced into the middle or the lower part of the shell of the heat exchange bin, and the heat conduction particles with fine particle sizes are doped into the sintering ore, so that the heat transfer between the low-temperature sintering ore and the heating surface pipeline can be enhanced, the heat transfer coefficient of a low-temperature section is improved, and the waste heat recovery efficiency of the sintering ore is improved.
Based on the design concept of the present invention, the waste heat recovery device may be designed to include a plurality of heat exchange bins, for example, a first heat exchange bin and a second heat exchange bin, each having the basic structure shown in fig. 4 or 5, which may be integrated, having a unified sintered ore hopper as a feeding unit, and a screen disposed below the sintered ore hopper, the screen being configured to guide the relatively small-sized sintered ore from the sintered ore hopper into the first heat exchange bin and the relatively large-sized sintered ore into the first heat exchange bin. Specifically, the screener is obliquely arranged above the first heat exchange bin, the sintered ore fed from the sintered ore hopper is subjected to sun staged screening, the small-particle-size sintered ore enters the first heat exchange bin, and the large-particle-size sintered ore enters the second heat exchange bin. The first heat exchange bin and the second heat exchange bin can be divided into two parts by independent bin bodies, and the partition wall is arranged between the first heat exchange bin and the second heat exchange bin and vertically extends upwards. Each heat exchange bin has a particle supply unit 7, said particle supply unit 7 being arranged on the middle or lower part of the housing of the respective heat exchange bin for providing heat conducting particles into the respective heat exchange bin.
The waste heat recovery device can also comprise a third heat exchange bin, wherein the third heat exchange bin has a different heat exchange mode with the first heat exchange bin and the second heat exchange bin, the first heat exchange bin and the second heat exchange bin adopt solid-solid heat exchange, and the third heat exchange bin adopts circulating air for heat exchange. For the first heat exchange bin and the second heat exchange bin, as mentioned above, the particle supply unit is arranged thereon and used for supplying heat conducting particles to the low-temperature sintering ore sections thereof so as to enhance heat exchange. For the third heat exchange bin, because circulating air is adopted for heat exchange, the heat exchange is not supplied to the particle supply unit, and the third heat exchange bin is suitable for heat exchange of the sintering ore with larger particles, the sintering ore is screened by using the screening device, the sintering ore with smaller diameter enters the first heat exchange bin, the sintering ore with middle diameter enters the second heat exchange bin, the sintering ore with larger diameter enters the third heat exchange bin, no heat exchange equipment is arranged in the third heat exchange bin, an air distribution device is arranged on the vertical lower side of the third heat exchange bin, and the air distribution device is configured to supply air flow which flows vertically upwards in the vertical direction to the third heat exchange bin; and a temperature-rising air outlet is formed in the third heat exchange bin, heat exchange airflow generated by the air distribution device is used for recovering heat of the large-particle sintering ore, and the heat exchange airflow absorbing the heat passes through the temperature-rising air outlet.
In order to absorb and utilize the high-temperature air of the warming air outlet, an external heat exchanger is provided, the external heat exchanger is arranged at the outer side of the third heat exchange bin and is formed by a barrel-shaped external heat exchanger shell, and the external heat exchanger is communicated with the third heat exchange bin through the warming air outlet and is used for recovering the heat of the airflow discharged from the third heat exchange bin. The external heat exchanger comprises at least one heat exchange device, such as an evaporator and an economizer, the temperature-raising air outlet is communicated with the inlet of the external heat exchanger in a fluid mode, and the outlet of the external heat exchanger is communicated with the air distribution device in a fluid mode.
The waste heat recovery device further comprises a dust remover, an air circulating fan and a first air regulating valve, wherein the dust remover and the air circulating fan are sequentially arranged on a connecting passage between the heat exchanger outside the bin and the air distribution device. In this way, the air flow of the third heat exchange chamber can be circulated.
In order to increase the heat exchange efficiency at the lower part of the third heat exchange bin, the invention also provides a heat exchange enhancement mode, and the waste heat recovery device is configured to be capable of introducing part of the circulating gas sent out by the air circulating fan into the first heat exchange bin and the second heat exchange bin so as to enhance heat exchange. Therefore, heat transfer of the low-temperature sections in the first heat transfer bin and the second heat transfer bin is enhanced by adopting heat conducting particles, and the heat transfer of the low-temperature sections in the two heat transfer bins is further enhanced by utilizing a part of circulating gas.
Thus, the circulating air is divided into two paths, one path of main air flow (most of air, about 95 percent of air) is directly connected into the third heat exchange bin (large particle heat exchange bin) to exchange heat with the large particle sinter; the other path of auxiliary air flow (a small amount of air, about 5 percent) enters the lower parts of the first heat exchange bin and the second heat exchange bin (the medium and small particle heat exchange bins), performs enhanced heat transfer on low-temperature sinter ore regions in the medium and small particle heat exchange bins, finally enters the third heat exchange bin through a partition wall air guide hole, and finally enters the heat exchanger outside the bin after being converged with the main air flow.
In the low-temperature section of the small-particle sintered ore heat exchange bin, trace circulating air is adopted to enhance heat transfer, so that the heat transfer coefficient of the low-temperature small-particle sintered ore is further improved, the waste heat recovery efficiency is improved, and the arrangement of heating surface pipelines at the lower parts of the first heat exchange bin and the second heat exchange bin can be reduced.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention. The scope of applicability of the present invention is defined by the appended claims and their equivalents.
List of reference numerals:
1. heat exchange bin
2. Sinter feed inlet
3. Sinter discharger
4. Superheater
5. Evaporator with a heat exchanger
6. Coal economizer
7. Particle supply unit
8. Sieve plate
9. Particle collecting hopper
10. Particle discharge port
11. And a sinter ore discharge port.
Claims (10)
1. The utility model provides a waste heat recovery device based on heat conduction particle enhanced heat transfer for retrieve the waste heat of sintering deposit, waste heat recovery device includes heat transfer storehouse (1), is used for receiving the sintering deposit, its characterized in that:
the waste heat recovery device is configured to introduce heat conducting particles into the heat exchange bin (1) to enhance local heat exchange in the heat exchange bin (1).
2. The heat recovery device based on heat conduction particle enhanced heat transfer as recited in claim 1, wherein the heat exchange bin (1) comprises:
a housing;
the sinter feed inlet (2) is arranged on the shell;
a sinter discharger (3) positioned at the bottom of the shell; and
at least one heat exchange device disposed within the housing,
the waste heat recovery device further comprises a particle supply unit (7), wherein the particle supply unit (7) is arranged in the middle or on the lower portion of the shell of the heat exchange bin (1) and used for providing heat conduction particles into the heat exchange bin (1).
3. The waste heat recovery device based on heat conduction particle enhanced heat transfer of claim 2, characterized in that:
the particle supply unit (7) comprises a particle distribution pipe which extends into the shell from the middle or lower part of the shell;
and a plurality of falling holes are uniformly formed in the particle distributing pipe.
4. The waste heat recovery device based on heat conduction particle enhanced heat transfer of claim 3, characterized in that:
the particle distribution pipe is placed obliquely in relation to the horizontal plane so that the heat conducting particles can slide along the particle distribution pipe under the influence of gravity and fall substantially uniformly from the drop opening.
5. The waste heat recovery device based on heat conduction particle enhanced heat transfer of claim 4, characterized in that:
the particle distributing pipes are arranged in a plurality of numbers, the particle distributing pipes are obliquely arranged relative to the horizontal plane at the same angle, the end parts of the particle distributing pipes, which are positioned in the heat exchange bin (1), are intersected at one point, and the vertical projections of the particle distributing pipes on the horizontal plane are uniformly distributed in the circumferential direction.
6. The waste heat recovery device based on heat conduction particle enhanced heat transfer of claim 5, characterized in that:
the at least one heat exchange device comprises more than two heat exchange devices, and the particle distributing pipe is arranged between the two adjacent heat exchange devices.
7. The heat recovery device based on heat conduction particle enhanced heat transfer as claimed in claim 2, wherein the housing comprises:
a first stage;
the second section is positioned above the first section, and the diameter of the second section is larger than that of the first section; and
a tapered section connecting the first section and the second section, the diameter of the tapered section gradually decreases along the vertical downward direction,
the particle supply unit (7) includes a particle introduction pipe disposed above the tapered section of the housing, communicating with the interior of the housing.
8. The waste heat recovery device based on heat conduction particle enhanced heat transfer of claim 7, characterized in that:
the particle introduction pipe is placed obliquely with respect to the horizontal plane and is substantially parallel to the inclined side surface of the tapered section.
9. The apparatus for recovering waste heat based on the enhanced heat transfer of the heat conducting particles according to any one of claims 2-8, further comprising:
a screen plate (8) which is arranged on the lower side of the sinter discharger (3) and is obliquely placed;
a particle collection hopper (9) arranged below the sieve plate (8) and covered by the sieve plate (8);
a particle discharge port (10) arranged at one end of the particle collection hopper (9) far away from the sieve plate (8); and
a sinter discharge port (11) arranged at the side of the particle collecting hopper (9),
wherein, the connecting line from the highest point to the lowest point of the sieve plate (8) is approximately directed to the sinter ore discharge port (11).
10. A waste heat recovery method based on heat conduction particle enhanced heat transfer is characterized in that: the waste heat recovery method adopts the waste heat recovery device based on the heat conduction particle enhanced heat transfer according to any one of claims 2-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210308839.6A CN114812203B (en) | 2022-03-25 | 2022-03-25 | Waste heat recovery device and recovery method based on heat conduction particle enhanced heat transfer |
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| CN202018025U (en) * | 2011-01-12 | 2011-10-26 | 熊天渝 | High temperature sintering mineral aggregate cooling and waste heat steam generator integration device |
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