CN109323597B

CN109323597B - Can solve inhomogeneous processing apparatus of agglomerate heat transfer

Info

Publication number: CN109323597B
Application number: CN201811381895.2A
Authority: CN
Inventors: 徐靖; 包向军; 陈�光; 李显宝
Original assignee: Anhui University of Technology AHUT
Current assignee: Anhui University of Technology AHUT
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2021-05-04
Anticipated expiration: 2038-11-19
Also published as: CN109323597A

Abstract

The invention discloses a treatment device capable of solving the problem of uneven heat exchange of sinter, and relates to vertical cooling kiln equipment for treating the waste heat of the sinter. The invention comprises a vertical cooling kiln, wherein a plurality of layers of isolating layers are arranged in the vertical cooling kiln from top to bottom, each layer of isolating layer comprises a plurality of adjacently arranged overturning bearing pieces, and two ends of each overturning bearing piece are respectively connected with a rotating shaft. The invention aims to overcome the defect of low heat exchange efficiency when the existing sintered ore is subjected to waste heat recovery in a vertical cooling kiln, provides a treatment device capable of solving the problem of uneven heat exchange of the sintered ore, and greatly improves the waste heat utilization rate in the sintered ore treatment process.

Description

Can solve inhomogeneous processing apparatus of agglomerate heat transfer

Technical Field

The invention relates to vertical cooling kiln equipment for treating the waste heat of sintered ores in the ferrous metallurgy industry, in particular to a treatment device capable of solving the problem of uneven heat exchange of the sintered ores.

Background

In the cooling and waste heat utilization of the sinter, the annular cooling or belt cooling process is mainly adopted at home and abroad, but the two processes have the problem of high air leakage rate, so that the high-temperature waste heat of the sinter cannot be effectively recycled; in the process of treating the sinter, a large amount of circulating air needs to be consumed, a large amount of air is diffused due to the problem of high air leakage rate, and harmful substances such as hydrogen sulfide, sulfur dioxide and the like contained in the diffused air can cause serious pollution to the surrounding environment.

Many researchers have studied the above problems and designed corresponding cooling process and waste heat recovery processing method of vertical cooling kiln for sintered ore, for example, patent publication No.: CN 207600221U, published: in 2018, 10 months 07, the invention and creation name is: the vertical cooling kiln equipment for cooling the sintering ore is characterized in that a vertical feed hopper is arranged at the top of a shell of the vertical cooling kiln equipment, a gas supply device is arranged at the lower part of an inner cavity of the shell and comprises nine small gas supply cavities with square top surfaces, a large square section is formed by connecting the nine small gas supply cavities into a cylindrical kiln chamber, the lower section of each gas supply cavity is conical and is formed by combining an upper conical hopper and a lower conical hopper, and an annular gap formed by inserting eaves is sleeved between the upper conical hopper and the lower conical hopper to form an annular channel; a central hood is arranged above the center of each air supply cavity, a horizontally placed cross air duct is arranged at the top of each upper cone, and the center of each cross air duct is overlapped with the center of the air supply cavity and extends upwards to be communicated with the central hood; the lower part of the shell is also horizontally provided with an upper air inlet and a lower air inlet. Although this vertical cold kiln equipment can retrieve the waste heat of sintering deposit, there has been the unloading segregation, and heat exchange efficiency is low, and waste heat recovery rate is not enough, and high temperature row material burns out the conveyer belt, and vertical cold kiln does not reach design effect scheduling problem, is difficult to realize the industrialization and uses.

In conclusion, how to overcome the defect that the heat exchange efficiency is low when the existing sintered ore is subjected to waste heat recovery in the vertical cooling kiln is a technical problem to be solved urgently in the prior art.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defect of low heat exchange efficiency when the existing sintered ore is subjected to waste heat recovery in a vertical cooling kiln, provides a treatment device capable of solving the problem of uneven heat exchange of the sintered ore, and greatly improves the waste heat utilization rate in the sintered ore treatment process.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the treatment device capable of solving the problem of uneven heat exchange of the sinter comprises a vertical cooling kiln, wherein a plurality of layers of isolating layers are arranged in the vertical cooling kiln from top to bottom, each layer of isolating layer comprises a plurality of adjacently arranged overturning bearing pieces, and two ends of each overturning bearing piece are respectively connected with a rotating shaft.

As a further improvement of the invention, the top of the vertical cooling kiln is respectively provided with a feed inlet and an air outlet, and the bottom of the vertical cooling kiln is respectively provided with a discharge outlet and an air inlet; each isolation layer is respectively provided with a plurality of through vent holes; and removing the isolation layer at the lowest layer, wherein the vent hole on one isolation layer is arranged at one side of the whole vertical cooling kiln, and the vent hole on the other isolation layer is arranged at the other side of the whole vertical cooling kiln.

As a further improvement of the invention, the whole isolation layer at the lowest layer is respectively provided with a vent hole.

As a further improvement of the invention, the vent hole of the uppermost isolation layer is arranged at a side far away from the air outlet.

As a further improvement of the present invention, the roll-over support is a rectangular plate.

As a further improvement of the present invention, the cross section of the turning bearing member is "cross-shaped", and the positions of the vent holes on each side of the turning bearing member are correspondingly the same.

As a further improvement of the invention, a conveyor belt is arranged below the discharge port.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:

according to the invention, the overturning arrangement of the isolation layer and the staggered arrangement of the vent holes are combined, so that the stacking state of the conventional sintering ore in the vertical cooling kiln is changed, the conventional filling material is converted into layered material during material distribution of the vertical cooling kiln, the sintering ore particles can freely fall in the overturning process of the overturning bearing member, the blanking uniformity is enhanced, the phenomenon that the heat exchange air cannot circulate due to accumulation of fine particles in the kiln is effectively avoided, meanwhile, the residence time of the heat exchange air in the vertical cooling kiln is obviously increased, the heat exchange time of the particles and the heat exchange air is prolonged, the heat exchange effect is enhanced, the waste heat utilization rate in the sintering ore treatment process is greatly improved, and the energy conservation and emission reduction of iron and steel enterprises are facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic view showing the structure of a treating apparatus capable of solving the problem of uneven heat exchange of sintered ore according to examples 1 to 4;

fig. 2 is a schematic structural view of the roll-over carrier in embodiment 3;

fig. 3 is a schematic sectional view of the roll-over carrier according to embodiment 4;

FIG. 4 is a flow chart of a treatment method capable of solving the problem of the uneven heat exchange of the sintered ore according to example 5.

The reference numerals in the schematic drawings illustrate: 1-vertical cooling kiln; 101-a feed inlet; 102-a discharge port; 103-air inlet; 104-air outlet; 105-a roll-over carrier; 1051-vent; 106-axis of rotation; 2-a conveyor belt.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Example 1

With reference to fig. 1, the treatment apparatus capable of solving the problem of uneven heat exchange of the sintered ore of the present embodiment includes a vertical cooling kiln 1, wherein a plurality of layers of isolation layers are arranged from top to bottom inside the vertical cooling kiln 1, each layer of isolation layer includes a plurality of adjacently arranged turnover bearing members 105, the turnover bearing members 105 on each layer of isolation layer are uniformly distributed over the cross section of the whole kiln chamber according to the size of the kiln chamber, and two ends of each turnover bearing member 105 are respectively connected with a rotating shaft 106. In this embodiment, the turnover bearing member 105 is made of refractory material, the center positions of the two ends of the turnover bearing member 105 are respectively connected with the rotating shaft 106 made of heat-resistant alloy tubes, the rotating shaft 106 extends out of the vertical cooling kiln 1 and is connected with the transmission mechanism (the gap between the rotating shaft 106 and the wall of the vertical cooling kiln 1 is filled with heat-insulating material, so as to prevent heat dissipation), the turnover bearing member 105 is driven to turn over under the control of the transmission mechanism, wherein the transmission mechanism can set the rotation time, the frequency and each turnover bearing member 105 can be controlled independently, so that specific working conditions can be adjusted according to specific heat exchange conditions. In the specific embodiment, the distance between two adjacent upper and lower isolation layers is controlled to be more than 2m so as to ensure the thickness of the material layer and the heat exchange efficiency.

In this embodiment, the top of the vertical kiln 1 is respectively provided with a feed port 101 and an air outlet 104, the bottom of the vertical kiln 1 is respectively provided with a discharge port 102 and an air inlet 103, and a conveyor belt 2 is arranged below the discharge port 102 (in this embodiment, the material of the conveyor belt 2 is subjected to a temperature of more than 400 ℃, so as to ensure that the solid sintered ore is effectively conveyed away); each isolation layer is respectively provided with a plurality of through vent holes 1051; and removing the isolation layer at the lowest layer, wherein the opening position of the vent hole 1051 on one isolation layer is positioned at one side of the whole vertical cooling kiln 1, and the opening position of the vent hole 1051 on the other isolation layer is positioned at the other side of the whole vertical cooling kiln 1 in other two isolation layers which are adjacent up and down. (i.e., removing the lowest layer of the isolation layer, and arranging the vent holes 1051 of any two adjacent isolation layers at opposite positions, and referring to FIG. 1 for the open form of the vent holes 1051)

The temperature of the existing sinter before treatment is about 450 ℃, the sinter stays in a kiln chamber for a long time in the cooling treatment process of a vertical cooling kiln, slowly falls to a conveyor belt, the temperature of the cooled sinter is about 200 ℃, and the cooling effect in design is not achieved. Through analysis, the main reason is that after sintering of the sintered ore is completed, the sintered ore is directly conveyed into a material distribution pipeline by a trolley without processes such as hot screening, wherein the particle size below 5mm is more than 20%, and fine particles are accumulated in a kiln, so that the final blanking segregation phenomenon is serious, the ventilation efficiency is low, and further the heat exchange efficiency is low. At present, the yield of cooled sinter in a vertical cooling kiln production process is 5500t/d, and the discharge temperature is about 200-250 ℃; distance design effect: the waste heat recovery system can generate 20t/h of high-pressure steam at 1.27MPa and 300 ℃ and 6t/h of low-pressure steam at 0.3MPa and 143 ℃ at a certain distance. Therefore, the recovery and the utilization of the waste heat resource of the sintered ore vertical cooling kiln play a key role in energy conservation, energy consumption reduction and pollutant emission reduction of the steel industry.

In this embodiment, the sintered ore flows into the vertical cooling kiln 1 from the feed port 101 through the distributing pipe, and at the same time, a plurality of isolating layers are arranged in the vertical cooling kiln 1 from top to bottom, each isolating layer comprises a plurality of overturning bearing pieces 105 which are arranged adjacently, two ends of each overturning bearing piece 105 are respectively connected with a rotating shaft 106, each of the turning carriers 105 is turned over by the rotary shaft 106, respectively, and after the sintered ore is first dropped onto the uppermost separation layer and cooled for a certain time, each overturning bearing piece 105 of the uppermost isolation layer is overturned, the blocky and powdery ore particles fall onto the second isolation layer for cooling, by analogy, the sintered ore is finally cooled to 150 ℃ and is conveyed to the conveyor belt 2 through the discharge port 102, and the sintered ore is subjected to interval blanking in the blanking process, so that the phenomenon that heat exchange air cannot circulate due to blockage of the sintered ore is avoided; in order to increase the heat exchange efficiency, a plurality of through vent holes 1051 are respectively formed in each isolation layer, the isolation layer at the lowest layer is removed, other upper and lower adjacent two isolation layers are arranged, the opening positions of the vent holes 1051 in one isolation layer are located on one side of the whole vertical cooling kiln 1, the opening positions of the vent holes 1051 in the other isolation layer are located on the other side of the whole vertical cooling kiln 1, the design makes heat exchange air flow into the vertical cooling kiln 1 from the air inlet 103 below, the heat exchange air flows along the S-shaped route in the vertical cooling kiln 1, and finally the air is discharged through the air outlet 104 at the top to be sent into a waste heat boiler for power generation, so that the flow of the heat exchange air is obviously increased.

In this embodiment, the upset setting of isolation layer and the crisscross setting of ventilation hole 1051 combine together, the state of piling up of current sintering deposit in vertical cooling kiln 1 has been changed, make vertical cooling kiln 1 turn into the layer-stepping cloth by traditional packing cloth when the cloth, the upset holds carrier 105 sintering deposit particulate matter can free fall in the upset in-process, the homogeneity of blanking has been strengthened, the phenomenon that makes the unable circulation of heat transfer air because of fine particles piles up in the kiln has effectively been avoided, and simultaneously, the dwell time of heat transfer air in vertical cooling kiln 1 is showing and is increasing, particulate matter and heat transfer air's heat transfer time has been increased, reinforce the heat transfer effect, the waste heat utilization who has increased substantially in the sintering deposit course of treatment, be favorable to the energy saving and emission reduction of iron and steel enterprise.

The treatment device capable of solving the problem of uneven heat exchange of the sintering ore in the embodiment enables the sintering ore to be arranged in a suspended manner in a kiln chamber, and the continuous overturning is equivalent to the continuous distribution, in the process, the vent holes 1051 are formed in different sides of the isolation layer, so that heat exchange air flows along an S shape in the kiln chamber, the cooling time is prolonged, the problems of uneven heat exchange and low heat exchange efficiency are effectively solved, about 80% of heat in the sintering ore waste heat treatment process can be recovered by the treatment device in the embodiment, the sintering ore waste heat utilization rate in the whole process is improved, and the waste gas pollution is reduced; the energy consumption is reduced by about 50 percent; the energy utilization rate is improved; the return period is less than half a year, which is beneficial to the energy conservation and emission reduction of iron and steel enterprises. Meanwhile, the treatment capacity of the sintered ore can be flexibly adjusted along with the yield, and the energy consumption is reduced under the condition of ensuring the quality of the solid sintered ore.

Example 2

The structure of the treatment device capable of solving the problem of uneven heat exchange of the sintered ore in the embodiment is basically the same as that in the embodiment 1, and further: the whole isolation layer at the lowest layer is respectively provided with a vent hole 1051, and the vent hole 1051 at the isolation layer at the uppermost layer is arranged at a position far away from the air outlet 104.

In the embodiment, the whole isolation layer at the lowest layer is respectively provided with the vent holes 1051, which is beneficial for heat exchange air to effectively enter the vertical cooling kiln 1 from the air inlet 103 for heat exchange; the vent hole 1051 on the top isolation layer is arranged at a position far away from the air outlet 104, so that the heat exchange air flow is increased in the process of flowing out of the interior of the vertical cooling kiln 1.

Example 3

Referring to fig. 2, the structure of the processing apparatus capable of solving the problem of uneven heat exchange of the sintered ore of the present embodiment is substantially the same as that of embodiment 2, and further: upset holds carrier 105 and is a rectangular plate, and the polylith rectangular plate of same isolation layer evenly spreads whole kiln thorax cross-section according to the kiln thorax size, and wherein ventilation hole 1051 sets up the corresponding position that holds carrier 105 in the corresponding upset.

Example 4

Referring to fig. 3, the structure of the processing apparatus capable of solving the problem of uneven heat exchange of the sintered ore of the present embodiment is substantially the same as that of embodiment 4, and further: the cross section that the carrier 105 was born in the upset is "cross", and the position of seting up of ventilation hole 1051 on every limit of this carrier 105 is born in the upset corresponds the same, and when the carrier 105 was born in the upset state in the upset, wherein the ascending limit of horizontal direction played and kept off the material effect, was in the ascending limit of vertical direction and played the heat accumulator effect, and it has strengthened the heat transfer effect of heat transfer air.

Example 5

Referring to fig. 4, the treatment method capable of solving the problem of uneven heat exchange of the sintered ore of the embodiment includes the following steps:

step A, preparation stage: preparing the treatment device of embodiment 3 or 4 capable of solving the problem of uneven heat exchange of the sinter;

b, introducing heat exchange gas and sinter: introducing gas to be heat exchanged into the vertical kiln 1 from an air inlet 103 at the bottom of the vertical kiln 1, and introducing sinter to be heat exchanged into the vertical kiln 1 from a feed inlet 101 at the top of the vertical kiln 1;

step C, controlling the turning carrier 105 to turn: controlling the overturning bearing piece 105 on each layer of isolation layer to rotate 180 degrees by taking the corresponding rotating shaft 106 as an axis within a set time interval;

d, recovering heat exchange gas and sinter: the sintered ore after heat exchange discharged from the discharge port 102 at the bottom of the vertical cooling kiln 1 falls to the conveyor belt 2 to be discharged, and the gas after heat exchange discharged from the air outlet 104 at the top of the vertical cooling kiln 1 is collected and reused.

Wherein, in step C, the rotation opposite direction between the carrier 105 is born in the adjacent upset of every layer of isolation layer of control, has prevented on the one hand that the upset from bearing the card of carrier 105 and dies, and on the other hand is favorable to evenly scattering the sintering deposit on the isolation layer of upper strata to the isolation layer of lower floor, strengthens heat transfer air's heat transfer effect.

In this embodiment, the control of the rotation time, frequency, etc. of the turnover carrier 105 is related to the cooling rate of the sintered ore, when the sintered ore passes through the middle upper part of the kiln chamber, the temperature of the sintered ore is required to be slowly cooled to the temperature range of the air outlet, and in the later cooling stage of the middle lower part, the temperature gradient of the sintered ore is adjusted to ensure that the sintered ore is not unevenly cooled. In actual production, whether the arrangement mode and the control mode of the turnover bearing piece 105 are reasonable can be judged according to the two points, so that corresponding adjustment can be automatically carried out.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a can solve inhomogeneous processing apparatus of sinter heat transfer, includes vertical cold kiln (1), its characterized in that: a plurality of layers of isolating layers are arranged in the vertical cooling kiln (1) from top to bottom, each layer of isolating layer comprises a plurality of adjacently arranged overturning bearing pieces (105), and two ends of each overturning bearing piece (105) are respectively connected with a rotating shaft (106);

the top of the vertical cooling kiln (1) is respectively provided with a feed inlet (101) and an air outlet (104), and the bottom of the vertical cooling kiln (1) is respectively provided with a discharge outlet (102) and an air inlet (103); each isolation layer is respectively provided with a plurality of through vent holes (1051); removing the isolation layer at the lowest layer, wherein the opening position of a vent hole (1051) on one isolation layer is positioned at one side of the whole vertical cooling kiln (1), and the opening position of a vent hole (1051) on the other isolation layer is positioned at the other side of the whole vertical cooling kiln (1) in other two isolation layers which are adjacent up and down; the overturning bearing piece (105) is a rectangular plate;

the cross section of the turnover bearing piece (105) is in a cross shape, and the opening positions of the vent holes (1051) on each side of the turnover bearing piece (105) are correspondingly the same.

2. The treatment device capable of solving the problem of uneven heat exchange of the sinter as claimed in claim 1, wherein: the whole isolation layer at the lowest layer is respectively provided with a vent hole (1051).

3. The treatment device capable of solving the problem of uneven heat exchange of the sinter as claimed in claim 1, wherein: the opening position of the vent hole (1051) on the isolation layer at the uppermost layer is positioned at one side far away from the air outlet (104).

4. The treatment device capable of solving the problem of uneven heat exchange of the sinter as claimed in claim 1, wherein: a conveying belt (2) is arranged below the discharge hole (102).