CN114812203B - 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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- CN114812203B CN114812203B CN202210308839.6A CN202210308839A CN114812203B CN 114812203 B CN114812203 B CN 114812203B CN 202210308839 A CN202210308839 A CN 202210308839A CN 114812203 B CN114812203 B CN 114812203B
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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 bin (1) comprises: a housing; a sinter feed inlet (2) 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 on the middle part or the lower part of the shell of the heat exchange bin (1) and is used for providing heat conduction particles into the heat exchange bin (1). The waste heat recovery device and the recovery method based on the heat conduction particle enhanced heat transfer can enhance the heat transfer between the low-temperature sintered ore and the heating surface pipeline, improve the coefficient of Duan Chuanre at low temperature and improve the waste heat recovery efficiency of the sintered 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 metallurgical process, and specifically relates to a waste heat recovery device and a waste heat recovery method based on heat conduction particle enhanced heat transfer.
Background
The steel production in China mainly adopts a long-flow production process of a blast furnace-converter, and the steel proportion of the converter is more than 90%. The sintering process is to mix various powdery iron-containing raw materials with a certain proportion of fuel and solvent before blast furnace ironmaking production, burn the raw materials on a sintering machine trolley, and sinter the raw materials into blocks after a series of physical and chemical changes. The waste heat resources of the sintering process mainly comprise the sensible heat of the finished sinter product and the sensible heat of the flue gas of the sintering machine, and the sensible heat carried by the sinter before cooling is about 44.5 percent of the total heat expenditure.
At present, the cooling of the sinter is generally carried out by a traditional ring cooler or a vertical pot furnace in China or even the world. The waste heat recovery process of the annular cooler has the remarkable 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 lower. The vertical tank furnace solves the problems of the circular cooler, has the advantages of lower air leakage rate, high hot air temperature, less dust emission and the like, however, because air passes through a thick material layer in the heat exchange process in the vertical tank furnace, the flow resistance of the air is very high, and the problems of extremely high self-power consumption and lower external power supply capacity of the system are further brought.
Aiming at the problems of the annular cooler and the vertical tank furnace, the technology of adopting vertical solid heat exchange waste heat recovery is developed and improved in recent years, and the heat exchange is directly carried out through the sinter and a heating surface pipeline arranged in a heat exchanger, so that the waste heat recovery efficiency of the sinter is improved, and the self power consumption of the waste heat recovery process is reduced. However, the heat transfer coefficient of direct heat exchange between the sinter and the heating surface pipeline is greatly affected by the temperature of the sinter, and the heat transfer coefficient is greatly reduced along with the reduction of the temperature of the sinter.
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 at least partially overcome the defects of the prior art 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, which solve the problem of low coefficient of Duan Chuanre at low temperature.
The invention also aims to provide a waste heat recovery device and a waste heat recovery method based on the heat conduction particle enhanced heat transfer, which have the advantage of improved waste heat recovery efficiency.
In order to achieve one of the above objects or purposes, the technical solution of the present invention is as follows:
the utility model provides a waste heat recovery device based on heat conduction granule reinforces heat transfer for retrieve the waste heat of sintering deposit, waste heat recovery device includes the heat transfer storehouse for receive the sintering deposit, waste heat recovery device is configured to introduce heat conduction granule in order to strengthen the heat transfer of heat transfer storehouse internal local into the heat transfer storehouse.
According to a preferred embodiment of the invention, the heat exchange cartridge comprises:
a housing;
the sinter feeding hole 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 on the middle part or the lower part of the shell of the heat exchange bin and is used for providing heat conduction particles into 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 distribution pipe.
According to a preferred embodiment of the invention, the particle distribution pipe is placed obliquely with respect 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 falling hole.
According to a preferred embodiment of the present invention, the number of the particle distribution pipes is plural, the plural particle distribution pipes are disposed obliquely with respect to the horizontal plane at the same angle, 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 invention, the at least one heat exchange device comprises more than two heat exchange devices, the particulate 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 invention, the housing comprises:
a first section;
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 gradually decreasing in a vertically downward direction,
the particle supply unit includes a particle introduction tube disposed above the tapered section of the housing in communication with the interior of the housing.
According to a preferred embodiment of the invention, the particle inlet pipe is placed obliquely with respect to the horizontal plane and substantially parallel to the inclined side surface of the tapering section.
According to a preferred embodiment of the present invention, the waste heat recovery device further comprises:
the screen plate is arranged at the lower side of the sinter discharger and is obliquely arranged;
the particle collecting hopper is arranged below the sieve plate and is covered by the sieve plate;
a particle discharge port provided at one end of the particle collection hopper remote from the screen plate; and
a sinter outlet arranged at the side of the particle collecting hopper,
wherein the line from the highest point to the lowest point of the screen plate is approximately directed to the sinter outlet.
According to a preferred embodiment of the present invention, the heat recovery apparatus further comprises a transfer pipe connected to the particle discharge port and the particle supply unit for transferring the heat 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 present invention, there is provided a heat recovery method based on heat transfer enhancement by heat conductive particles, which adopts the heat recovery device based on heat transfer enhancement by heat conductive particles according to any one of the foregoing embodiments.
According to a preferred embodiment of the present invention, the waste heat recovery method includes:
supplying sinter into the heat exchange bin through the sinter feed inlet;
providing heat conducting particles to the heat exchange bin through a particle supply unit;
recovering heat of the sinter by using heat exchange equipment in the heat exchange bin;
discharging the heat exchanged sinter and heat conducting particles by using a sinter discharger;
separating the sinter and the heat conducting particles by using a sieve plate;
collecting the thermally conductive particles separated by the screen plate and returning the thermally conductive particles to the particle supply unit; and
discharging the separated sinter.
According to the heat recovery device and the heat recovery method based on the heat conduction particle enhanced heat transfer, the heat conduction particles are introduced into the middle part 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 sinter, so that the heat transfer between the low-temperature sinter and the heating surface pipeline can be enhanced, the low-temperature Duan Chuanre coefficient is improved, and the heat recovery efficiency of the sinter is improved.
Drawings
FIG. 1 shows exemplarily the relation of sinter temperature and heat transfer coefficient;
FIG. 2 shows exemplary agglomerate particle size versus heat transfer coefficient;
FIG. 3 is a graph exemplarily showing a relationship between a fine particle incorporation ratio and a heat transfer coefficient;
fig. 4 is a schematic structural view of a heat recovery device based on enhanced heat transfer by thermally conductive particles according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a heat recovery device based on enhanced heat transfer by heat conductive particles according to another embodiment of the present invention; and
fig. 6 is a flow chart of a heat recovery method based on enhanced heat transfer by thermally conductive particles according to one embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein the same or similar reference numerals denote the same 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 present 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 the drawings in order to simplify the drawings.
Fig. 1 shows exemplarily the relation between the sinter temperature and the heat transfer coefficient, the lower the sinter temperature, the lower the heat transfer coefficient, which means that in the vertical solid heat exchange technology, in the heat exchange bin, as the sinter falls down, the heat of the sinter is gradually exchanged to the heat exchange device, the temperature thereof gradually decreases, and then the sinter temperature is lower at the lower position of the heat exchange bin, and the heat transfer coefficient is not high at this time.
In addition, the particle size distribution of the sintering mineral aggregate is wide, the particle size of the high-temperature material is in the range of 3 mm-200 mm, and the heat exchange properties of the sintering mineral aggregate with different particle sizes are different. In the vertical solid heat exchange technology, the larger the particle size of the agglomerate, the smaller the heat transfer coefficient thereof, and the typical relation between the particle size of the agglomerate and the heat transfer coefficient is shown in fig. 2, which means that the agglomerate with lower particle size has higher heat exchange efficiency and waste heat recovery efficiency.
In order to increase the heat exchange efficiency of the lower part of the heat exchange bin, the invention provides a heat recovery device based on heat conduction particle enhanced heat transfer, which comprises the heat exchange bin, wherein the heat recovery device is configured to introduce heat conduction particles into the middle part or the lower part of the heat exchange bin so as to enhance local heat exchange in the heat exchange bin. And the heat transfer between the low-temperature sintered ore and the heating surface pipeline is enhanced through the introduced heat conducting particles. Fig. 3 exemplarily shows a relationship between the fine particle doping ratio and the heat transfer coefficient, and when the fine particle doping ratio increases, the heat transfer coefficient of the low-temperature sintered ore increases. The heat conducting particles can be metal particles with proper particle size, and the particle size is far smaller than that of the sintering ore.
Fig. 4 is a schematic structural view of a heat recovery device based on enhanced heat transfer of heat conductive particles according to an embodiment of the present invention, and as shown in fig. 4, the heat recovery device includes a heat exchange bin 1 for receiving sinter, and the heat exchange bin 1 includes: a housing having a substantially cylindrical shape with tapered portions at upper and lower ends; the sinter feed inlet 2 is arranged at the upper end of the shell, alternatively, the sinter feed inlet can be arranged on the side surface of the shell as long as the sinter feed inlet is positioned at the examined position; a sinter discharger 3 positioned at the bottom of the shell and on the tapered section of the bottom; and a plurality of heat exchange devices disposed in the housing, the plurality of heat exchange devices including a superheater 4, an evaporator 5 and an economizer 6, which are disposed in order from top to bottom. The waste heat recovery device further comprises a particle supply unit 7, wherein the particle supply unit 7 is arranged on the middle part of the shell of the heat exchange bin 1 and is used for providing heat conduction particles into the heat exchange bin 1. In other embodiments, the particle supply unit 7 may be provided on a lower portion of the housing of the heat exchange cartridge 1.
In the embodiment of fig. 4, the particle supply unit 7 is a particle distribution pipe extending from the middle of the housing into the housing. In other embodiments, the particle supply unit 7 may extend from a lower portion of the housing into the housing. The particle distribution pipe is uniformly provided with a plurality of falling holes, and the particle distribution pipe is obliquely arranged relative to the horizontal plane, so that the heat conduction particles can slide along the particle distribution pipe under the action of gravity and fall from the falling holes approximately uniformly. The number of the particle distribution pipes can be one or more. In the case of a particle distribution tube, it extends from side to side in the radial direction of the cylindrical housing, either horizontally or obliquely. In the case of a plurality of particle distribution pipes, the plurality of particle distribution pipes may be disposed obliquely with respect to the horizontal plane at the same angle, the ends of the plurality of particle distribution pipes located in the heat exchange compartment 1 intersect at a point, and the vertical projections of the plurality of particle distribution pipes on the horizontal plane are uniformly distributed in the circumferential direction. Thus, the plurality of particle distribution pipes are uniformly distributed on the circumference in a top view from the top down.
The particulate distribution pipe is provided between two adjacent heat exchange devices, for example, as shown in fig. 4, between the evaporator 5 and the economizer 6. In this way, the heat conductive particles fed from the particle distribution pipe act on the region where the economizer 6 is located, and heat exchange between the sintered ore and the economizer 6 in this region 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 disposed obliquely; a particle collection hopper 9 disposed below the screen plate 8 and covered by the screen plate 8; a particle discharge port 10 provided on an end of the particle collection hopper 9 remote from the screen plate 8; and a sinter discharge port 11 provided beside the particle collection hopper 9, wherein a line connecting a highest point to a lowest point of the screen plate 8 is directed substantially toward the sinter discharge port 11. The heat exchanged sinter and the heat conducting particles can be separated through the sieve plate 8, only the aperture of the sieve plate 8 is required to be controlled, and as the particle size of the heat conducting particles is smaller than that of the sinter, the heat conducting particles fall into the particle collecting hopper 9 through the sieve plate 8, then are discharged through the particle discharge port 10, and the sinter which does not pass through the sieve plate 8 falls to the sinter discharge port 11 under the action of gravity to be discharged and collected.
Preferably, the heat conductive particles are reusable, for which purpose the waste heat recovery device further comprises a transport pipe connected to the particle discharge port 10 and the particle supply unit 7 for transporting the heat conductive particles discharged from the particle discharge port 10 to the particle supply unit 7. A driving unit may be provided on the conveying pipe to drive the heat conductive particles to rise to the particle supply unit 7, for example, a screw auger is provided on the conveying pipe to push the heat conductive particles to rise.
Advantageously, the particle distribution pipes may be arranged in two layers, each layer of particle distribution pipes comprising a plurality of particle distribution pipes uniformly distributed in the axial direction, and the perpendicular projection of the first layer of particle distribution pipes in the horizontal plane is staggered from the perpendicular 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 intersect at a point at the center of the heat exchange chamber, but an open area is provided at the focal point such that the plurality of particle distribution pipes are joined only at the upper end and are completely opened at the lower end, so that the heat conductive particles that do not fall through the falling hole are finally transported thereto, and fall at the open area.
Fig. 5 is a schematic structural view of a heat recovery device based on enhanced heat transfer by heat conductive particles according to another embodiment of the present invention, which has substantially the same structure as the heat recovery device of fig. 4, except 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 shape with a large upper part and a small lower part, and includes: a first section; 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 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 in communication with the interior of the housing. The particle introduction tube is disposed obliquely with respect to a horizontal plane and is substantially parallel to an oblique side surface of the tapered section. Since the tapered section has an inclined side surface, 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 surface and finally guided to the economizer 6 region. In fig. 5, too, the plurality of heat exchange devices comprises a superheater 4, an evaporator 5 and an economizer 6, the superheater 4 and the evaporator 5 being arranged in a second section of the housing, the economizer 6 being arranged in a first section of the housing. In this way, the different heat exchange devices are separated by the tapered section and the particle to inlet. In other embodiments, two heat exchange devices may be provided in the first section, one heat exchange device in the second section, or other combinations of designs. In summary, at least one heat exchange device is arranged in the first section and at least one heat exchange device is also arranged in the second section.
The number of the particle introduction pipes may be plural, and they are uniformly distributed on the outer periphery of the housing. As shown in fig. 5, the plurality of particle introduction pipes are each disposed obliquely to the horizontal plane, and the plurality of particle introduction pipes are each directed toward the center line of the housing, that is, the longitudinal extension lines of the particle introduction pipes intersect the center line of the housing, and the longitudinal extension lines of the plurality of particle introduction pipes intersect the center line of the housing at one point.
Advantageously, the plurality of particle introduction pipes are each disposed obliquely to the horizontal plane, but the longitudinal extension lines of the plurality of particle introduction pipes are not directed toward the center line of the housing, but are offset from the center line of the housing, and the plurality of particle introduction pipes are tangent to the same cylinder centered on the center line. It thus appears that the plurality of particle introduction pipes form a spiral around the center line, through which the thermally conductive particles falling into the first section are spirally distributed into the first section.
Otherwise, the embodiment of fig. 5 is substantially identical to the embodiment of fig. 4, with identical screen plates 8, particle collection hoppers 9, particle discharge openings 10, sinter discharge openings 11, so that the thermally conductive particles can likewise be recycled.
According to another aspect of the present invention, there is provided a heat recovery method based on heat transfer enhancement by heat conductive particles, which adopts the heat recovery device based on heat transfer enhancement by heat conductive particles according to any one of the foregoing embodiments.
As shown in fig. 6, the waste heat recovery method includes:
the sinter is supplied into the heat exchange bin 1 through the sinter feed inlet 2;
providing heat conducting particles to the heat exchange bin 1 by means of a particle supply unit 7;
the heat of the sinter is recovered by heat exchange equipment in the heat exchange bin 1;
discharging the heat exchanged sinter and heat conducting particles by using a sinter discharger 3;
separating the sinter and the heat conducting particles by using a sieve plate 8;
the heat conductive particles separated by the screen plate 8 are collected and returned to the particle supply unit 7; and
discharging the separated sinter.
According to the heat recovery device and the heat recovery method based on the heat conduction particle enhanced heat transfer, the heat conduction particles are introduced into the middle part 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 sinter, so that the heat transfer between the low-temperature sinter and the heating surface pipeline can be enhanced, the low-temperature Duan Chuanre coefficient is improved, and the heat recovery efficiency of the sinter 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 exchanging compartments, for example, including a first heat exchanging compartment and a second heat exchanging compartment, each of which has a basic structure shown in fig. 4 or 5, which may be integrated with a unified sinter hopper as a feeding unit, and below the sinter hopper, a screen configured to guide sinter of a relatively smaller particle size from the sinter hopper into the first heat exchanging compartment and guide sinter of a relatively larger particle size into the first heat exchanging compartment is provided. Specifically, the screening ware sets up in the top of first heat transfer storehouse with slope, and the sinter that drops into from the sinter hopper is through shining the stage screening, and the entering first heat transfer storehouse of particle diameter is little, and the entering second heat transfer storehouse of particle diameter is big. The first heat exchange bin and the second heat exchange bin can be divided into two parts by independent bin bodies, and the dividing wall is vertically and upwards extended between the first heat exchange bin and the second heat exchange bin. Each heat exchange compartment has a particle supply unit 7, which particle supply unit 7 is arranged on the middle or lower part of the housing of the respective heat exchange compartment for providing heat conducting particles into the respective heat exchange compartment.
The waste heat recovery device can further comprise a third heat exchange bin, the third heat exchange bin is different from the first heat exchange bin and the second heat exchange bin in heat exchange mode, 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. As for the first heat exchange bin and the second heat exchange bin, as described above, a particle supply unit for supplying heat conductive particles to their low temperature sintered ore sections is provided thereon to enhance heat exchange. For the third heat exchange bin, because circulating air is adopted for heat exchange, a particle supply unit is not supplied, the third heat exchange bin is suitable for heat exchange of agglomerate with larger particles, so that the agglomerate is screened by a screening device, agglomerate with smaller diameter enters the first heat exchange bin, agglomerate with middle diameter enters the second heat exchange bin, agglomerate with larger diameter carries out 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 vertically upwards along the vertical direction into the third heat exchange bin; the third heat exchange bin is provided with a heating air outlet, heat exchange air flow generated by the air distribution device is used for recovering heat of the large-particle sintered ore, and heat exchange air flow absorbing the heat passes through the heating air outlet.
In order to absorb the high temperature air using the warm air discharge port, an off-bin heat exchanger is provided, which is disposed outside the third heat exchange bin, formed of a tub-shaped off-bin heat exchanger housing, in fluid communication with the third heat exchange bin through the warm air discharge port, for recovering heat of the air flow discharged from the third heat exchange bin. The off-board heat exchanger includes at least one heat exchange device, such as an evaporator and an economizer, with the warmed air exhaust port in fluid communication with an inlet of the off-board heat exchanger and an outlet of the off-board heat exchanger in fluid communication with the aforementioned air distribution device.
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 out-bin heat exchanger and the air distributing device. In this way, the air flow of the third heat exchange bin can be circulated.
In order to increase the heat exchange efficiency of the lower part of the third heat exchange bin, the invention also provides an enhanced heat exchange mode, and the waste heat recovery device is configured to enable part of the circulating gas sent out by the air circulating fan to be introduced into the first heat exchange bin and the second heat exchange bin so as to enhance heat exchange. Therefore, besides adopting heat conducting particles to strengthen the heat exchange of the low-temperature sections in the first heat exchange bin and the second heat exchange bin, strengthening measures are further added, and part of circulating gas is utilized to further strengthen the heat exchange of the low-temperature sections in the two heat exchange bins.
In this way, the circulated air is divided into two paths, and one main air flow (most, about 95% of air) is directly connected into a 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 few, about 5% of air) enters the lower parts of the first heat exchange bin and the second heat exchange bin (the middle and small particle heat exchange bins), the low-temperature sinter area in the middle and small particle heat exchange bins carries out enhanced heat transfer, finally enters the third heat exchange bin through the air guide holes of the partition wall, and finally enters the out-bin heat exchanger together after being converged with the main air flow.
The invention adopts trace circulating air to strengthen heat transfer at the low-temperature section of the small-particle sintering ore heat exchange bin, further improves the heat transfer coefficient of the low-temperature small-particle sintering ore, improves the waste heat recovery efficiency, and can reduce the arrangement of heating surface pipelines at the lower parts of the first heat exchange bin and the second heat exchange bin.
Although embodiments of the present invention have been shown and described, it will 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 equivalents thereof.
List of reference numerals:
1. heat exchange bin
2. Sinter feed inlet
3. Sinter discharger
4. Superheater with a heat exchanger
5. Evaporator
6. Coal economizer
7. Particle supply unit
8. Sieve plate
9. Particle collecting hopper
10. Particle discharge outlet
11. And a sinter outlet.
Claims (6)
1. Waste heat recovery device based on heat conduction granule reinforces heat transfer for retrieve the waste heat of sintering deposit, waste heat recovery device includes heat transfer bin (1) for receive 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) so as to strengthen local heat exchange in the heat exchange bin (1);
the heat exchange bin (1) comprises:
a housing;
a sinter feed inlet (2) 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 at the middle part or the lower part of the shell of the heat exchange bin (1) and is used for providing heat conduction particles into the heat exchange bin (1);
the particle supply unit (7) comprises a particle distribution pipe extending into the housing from the middle or lower part of the housing;
a plurality of falling holes are uniformly formed in the particle distribution pipe;
the number of the particle distribution pipes is multiple, the particle distribution pipes are obliquely arranged at the same angle relative to the horizontal plane, so that the heat conduction particles can slide along the particle distribution pipes under the action of gravity and uniformly fall from the falling holes, the ends of the particle distribution pipes in the heat exchange bin (1) intersect at one point, and the vertical projections of the particle distribution pipes on the horizontal plane are uniformly distributed in the circumferential direction;
an open area is provided at the intersection of the plurality of particle distribution pipes such that the thermally conductive particles that do not fall through the falling holes are eventually conveyed to the open area where they fall.
2. The heat recovery device based on enhanced heat transfer of thermally conductive particles according to claim 1, wherein:
the at least one heat exchange device comprises more than two heat exchange devices, and the particle distribution pipe is arranged between two adjacent heat exchange devices.
3. The heat recovery device based on enhanced heat transfer of thermally conductive particles according to claim 2, wherein:
the at least one heat exchange device includes a superheater, an evaporator, and an economizer.
4. A heat recovery device based on enhanced heat transfer by thermally conductive particles according to any one of claims 1-3, further comprising:
a screen plate (8) which is arranged at the lower side of the sinter discharger (3) and is obliquely arranged;
a particle collection hopper (9) arranged below the screen plate (8) and covered by the screen 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 outlet (11) arranged beside the particle collecting hopper (9),
wherein the connection line from the highest point to the lowest point of the screen plate (8) is directed to the sinter outlet (11).
5. The heat recovery device based on enhanced heat transfer of heat conducting particles according to claim 4, wherein:
the waste heat recovery device further includes a transfer pipe connected to the particle discharge port and the particle supply unit for transferring the heat conductive particles discharged from the particle discharge port to the particle supply unit.
6. A waste heat recovery method based on heat conduction particle intensified heat transfer is characterized in that: the waste heat recovery method adopts the waste heat recovery device based on heat conduction particle enhanced heat transfer according to any one of claims 1 to 5.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114812203A CN114812203A (en) | 2022-07-29 |
| CN114812203B true CN114812203B (en) | 2023-06-23 |
Family
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| CN100592014C (en) * | 2008-10-09 | 2010-02-24 | 王绍良 | Waste drying method and its system device |
| CN202018025U (en) * | 2011-01-12 | 2011-10-26 | 熊天渝 | High temperature sintering mineral aggregate cooling and waste heat steam generator integration device |
| CN109654925B (en) * | 2017-10-12 | 2020-03-31 | 中国石油化工股份有限公司 | Method for continuously recycling particles in fluidized bed heat exchanger |
| CN109442361B (en) * | 2018-09-13 | 2019-11-08 | 西安交通大学 | A kind of integrated system recycled for the efficient step of solid granule waste heat |
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| CN110455112B (en) * | 2019-08-22 | 2024-04-30 | 华南师范大学 | Enhanced heat transfer device and enhanced heat transfer method |
| CN112923738A (en) * | 2021-04-22 | 2021-06-08 | 四川川锅锅炉有限责任公司 | Combined type solid-solid heat exchange waste heat recovery device and method for high-temperature sintered ore |
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