CN112229257A

CN112229257A - Waste heat recovery device and hot rolling production line

Info

Publication number: CN112229257A
Application number: CN202011178482.1A
Authority: CN
Inventors: 赵富强; 喇思兰; 李凌宇; 李宁; 侯俊卿; 张碧辉; 罗婧青
Original assignee: Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
Current assignee: Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-01-15

Abstract

The application discloses waste heat recovery device and hot rolling production line relates to metallurgical technical field. The waste heat recovery device is used for recovering waste heat in hot rolled steel and comprises a heat exchange chamber, wherein the hot rolled steel and gas in the heat exchange chamber exchange heat to form heat energy gas; a material conveying port is formed in the end part of the heat exchange chamber and is used for the hot rolled steel to enter and exit the heat exchange chamber; the material conveying port is provided with a sealing mechanism which is used for closing or opening the material conveying port. The hot rolling production line comprises the waste heat recovery device. The application provides a waste heat recovery device can realize the high rate of recovery of hot rolling steel waste heat to realize energy-conserving effect.

Description

Waste heat recovery device and hot rolling production line

Technical Field

The application relates to the technical field of metallurgy, in particular to a waste heat recovery device and a hot rolling production line.

Background

In the metallurgical industry, energy consumption accounts for a large proportion of the cost of the product. The coiling temperature of the hot-rolled stainless steel is generally 800 ℃, the coiled steel coil is conveyed to a finished product bay through a collecting device for air cooling or placed in a slow cooling pit for slow cooling, so that a large amount of high-quality heat contained in the steel coil is directly dissipated into the air, and energy waste is caused.

However, the existing waste heat recovery device has the problem of serious heat loss, so that the waste heat recovery rate is not high.

Disclosure of Invention

The application provides a waste heat recovery device and hot rolling production line can retrieve the waste heat in the hot rolled steel to the energy can be saved.

In order to solve the above problems, the present application provides:

a waste heat recovery device is used for recovering waste heat in hot rolled steel and comprises a heat exchange chamber, wherein the hot rolled steel exchanges heat with gas in the heat exchange chamber to form heat energy gas;

a material conveying port is formed in the end part of the heat exchange chamber and is used for the hot rolled steel to enter and exit the heat exchange chamber; the material conveying port is provided with a sealing mechanism which is used for closing or opening the material conveying port.

In one possible embodiment, the sealing mechanism comprises a sealing door unit and a gas sealing unit; the air sealing unit is arranged on one side of the sealing door unit close to the interior of the heat exchange chamber;

the sealing door unit is used for mechanically sealing the material conveying port; the air seal unit is used for forming positive pressure airflow at the material conveying port so as to block the outward flow of the air in the heat exchange chamber.

In a possible implementation manner, the air sealing unit comprises two groups of high-pressure air nozzles, and the two groups of high-pressure air nozzles are arranged oppositely;

when the sealing mechanism seals the material conveying port, the two groups of high-pressure air nozzles are respectively arranged on two opposite sides of the material conveying port; the high-pressure air nozzle is used for being communicated with a compressed air source so as to form positive pressure air flow at the material conveying port.

In one possible embodiment, the sealing door unit comprises a sealing door and a lifting assembly, and the lifting assembly is used for driving the sealing door to lift to close or open the material conveying port.

In a possible embodiment, the sealing door unit further comprises a pressing assembly for pushing the sealing door to move in a direction close to the heat exchange chamber.

In one possible embodiment, the hold-down assembly comprises a weight, a mounting bracket and a connecting rod; the mounting rack is fixedly mounted on one side, far away from the air sealing unit, of the sealing door; the counterweight is arranged on the mounting frame in a swinging manner through the connecting rod;

the vertical distance from the connecting point of the connecting rod and the mounting rack to the sealing door is smaller than the vertical distance from the gravity center of the counterweight member to the sealing door.

In a possible embodiment, a plurality of baffles are further arranged in the heat exchange chamber at intervals, and the baffles are used for guiding the airflow in the heat exchange chamber.

In a possible embodiment, the waste heat recovery device further comprises a material conveying mechanism for conveying hot rolled steel into or out of the heat exchange chamber;

the material conveying mechanism comprises a track, a movable trolley and a driving piece, and the driving piece is used for driving the movable trolley to move along the track.

In a possible embodiment, a limiting bracket is arranged on the moving trolley and used for limiting the hot rolled steel.

In another aspect, the application provides a hot rolling production line, comprising the waste heat recovery device.

The beneficial effect of this application is: the application provides a waste heat recovery device, which comprises a heat exchange chamber, wherein a material conveying port is arranged at the end part of the heat exchange chamber and is used for hot rolled steel to enter and exit the heat exchange chamber; the material conveying port is provided with a sealing mechanism which is used for sealing or opening the material conveying port.

In the production process of the hot rolled steel, the produced and molded hot rolled steel can be transferred into the heat exchange chamber through the material conveying port, and then the material conveying port can be sealed by the sealing mechanism, so that the heat exchange of air inside and outside the heat exchange chamber can be avoided. After the hot rolled steel exchanges heat with the air in the heat exchange chamber, the low-temperature gas in the heat exchange chamber becomes high-temperature gas, namely heat energy gas, the generated heat energy gas can be reused, illustratively, the heat energy gas can be introduced into the heat pipe waste heat boiler to exchange heat with water, and the water absorbs heat to generate corresponding medium-pressure steam and low-pressure steam, wherein the medium-pressure steam can be used for thermal power generation, and the low-pressure steam can be used for thermal deoxidization of the heat pipe waste heat boiler. Therefore, the waste heat in the hot rolled steel after molding is recycled, so that the purpose of saving energy is realized, namely the purpose of saving energy in the hot rolling production process is realized. Meanwhile, the sealing mechanism can prevent heat in the heat exchange chamber from dissipating outwards, so that the recovery rate of waste heat in the hot rolled steel is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required 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 application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 shows a schematic top view of a waste heat recovery device;

FIG. 2 is a schematic diagram of a side view of a waste heat recovery device;

FIG. 3 illustrates a partial schematic view of a sealing mechanism;

FIG. 4 shows a schematic structural view of a sealing door unit;

FIG. 5 is a schematic view showing a structure in which a sealing door is installed in a heat exchange chamber;

figure 6 shows a schematic diagram of the forces between the hold-down assembly and the sealing door.

Description of the main element symbols:

1-a heat exchange chamber; 11-a housing; 12-a material delivery port; 121-a material input port; 122-material outlet; 13-an exhaust port; 14-a cover plate; 2-a sealing mechanism; 21-a sealing door unit; 211-a sealing door; 212-a lifting assembly; 212 a-a hoist; 212 b-steel wire rope; 213-a hold-down assembly; 213 a-a weight; 213 b-a mount; 213 c-a connecting rod; 213 d-mounting frame; 22-a gas seal unit; 221-sealing curtains; 222-high pressure air tap; 223-a gap; 3-a gas transmission mechanism; 4-a flow guide plate; 5-a material conveying mechanism; 51-a track; 52-moving the trolley; 521-a limit bracket; 53-a drive member; 6-hoisting mechanism; 7-compressed air source; 8, a waste heat utilization device; 9-hot rolled steel.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Example one

The embodiment provides a waste heat recovery device, can be used to in the production of hot rolled steel, can retrieve the waste heat of hot rolled steel 9 self to realize the effect of energy recycle, energy can be saved, with the extravagant problem of energy in the solution hot rolled steel production process.

As shown in fig. 1 and 2, the waste heat recovery apparatus includes a heat exchange chamber 1. The end of the heat exchange chamber 1 is provided with a material transfer port 12 to facilitate the transfer of material from the material transfer port 12 into and out of the heat exchange chamber 1. Wherein the material can be hot rolled steel 9; specifically, the material may be a hot-rolled stainless steel coil subjected to hot-rolling coiling. The hot rolled steel 9 can be heat exchanged with gas in the heat exchange chamber 1 to form a hot energy gas.

Of course, in other embodiments, the hot-rolled steel 9 may be a hot-rolled steel product such as a hot-rolled steel strip.

The material conveying port 12 is further provided with a sealing mechanism 2, and the sealing mechanism 2 is used for closing or opening the material conveying port 12. It will be appreciated that the sealing mechanism 2 opens the material transfer port 12 when hot rolled steel 9 enters and exits the heat exchange chamber 1. When the hot rolled steel 9 carries out heat exchange in the heat exchange chamber 1, the sealing mechanism 2 can seal the material conveying port 12 to avoid heat loss.

During production, the sealing mechanism 2 opens the material conveying port 12, and the hot rolled steel 9 with higher temperature can be conveyed into the heat exchange chamber 1 through the material conveying port 12. Subsequently, the material conveying port 12 is closed by the sealing mechanism 2 to seal the heat exchange chamber 1, so that the air flow in the heat exchange chamber 1 is prevented from leaking outwards through the material conveying port 12, and further, the heat is prevented from leaking outwards. In the heat exchange chamber 1, the hot rolled steel 9 is heat exchanged with the gas in the heat exchange chamber 1 to transfer heat energy from the hot rolled steel 9 to the gas in the heat exchange chamber 1. Thereby, the temperature of the low-temperature gas in the heat exchange chamber 1 is gradually increased to become a gas with higher temperature, and a heat energy gas carrying heat energy is formed; meanwhile, the temperature of the hot rolled steel 9 itself is gradually lowered to achieve the cooling effect. After the heat exchange of the hot rolled steel 9 in the heat exchange chamber 1 is completed, the hot rolled steel 9 in the heat exchange chamber 1 can be replaced, the waste heat recovery of the next group of hot rolled steel 9 is carried out, and the cooled hot rolled steel 9 can be conveyed to a finished product bay for storage.

During the heat exchange process, the generated thermal energy gas with higher temperature can be recycled. For example, the heat energy gas can be introduced into the heat pipe waste heat boiler to exchange heat with water, and the water absorbs heat to generate corresponding medium-pressure steam and low-pressure steam, wherein the medium-pressure steam can be used for thermal power generation, and the low-pressure steam can be used for thermal deoxygenation of the heat pipe waste heat boiler. Therefore, the waste heat in the hot rolled steel 9 is recycled, namely the energy is recycled, so that the energy utilization rate is improved, meanwhile, the effect of saving energy can be realized, and the energy consumption in the production process of the hot rolled steel is saved. Through the arrangement of the sealing mechanism 2, the heat in the heat exchange chamber 1 can be prevented from being dissipated outwards, so that the waste heat recovery rate of the waste heat recovery device is improved.

In conclusion, the waste heat recovery device provided by the application can recycle the waste heat in the hot rolled steel 9 so as to realize the reduction of energy consumption in the production process of energy-saving and hot rolled steel and simultaneously has higher waste heat recovery rate.

Example two

The embodiment provides a waste heat recovery device, and it can be understood that the embodiment is a further improvement made on the basis of the first embodiment.

As shown in fig. 1 and 2, the heat exchange chamber 1 includes a casing 11, and the inside of the casing 11 is a space where the hot rolled steel 9 exchanges heat with the low-temperature gas.

In some embodiments, the housing 11 may include a steel shell and an insulation material filled inside the steel shell. Therefore, the heat insulation effect of the shell 11 is realized, the heat inside the shell 11 is ensured not to be dissipated outwards, namely, the heat exchange chamber 1 and the external environment are ensured to be in a heat insulation state, and the waste heat recovery rate is improved.

For example, the thermal insulation material filled in the interior of the housing 11 may be polyurethane foam, glass wool, foamed cement, rock wool, or the like.

In an embodiment, the top of the housing 11 is further provided with a removable cover plate 14 for closing the top of the housing 11. When the waste heat recovery device breaks down, the cover plate 14 can be opened through the lifting equipment, and the hot rolled steel 9 in the shell 11 can be lifted out, so that the maintenance can be conveniently carried out after the temperature in the shell 11 is reduced.

In an embodiment, the material conveying port 12 may be disposed at an end of the housing 11 in the horizontal direction, and specifically, the material conveying port 12 may be disposed at an end of the housing 11 in the longitudinal direction. The material delivery port 12 includes a material input port 121 and a material output port 122 disposed opposite one another. Therefore, the hot rolled steel 9 with high temperature can enter the heat exchange chamber 1 from the material inlet 121, and the cooled hot rolled steel 9 can be sent out of the heat exchange chamber 1 from the material outlet 122, so that the one-way conveying of the hot rolled steel 9 is realized, and the production efficiency is improved.

Correspondingly, a sealing mechanism 2 is arranged at each of the material inlet 121 and the material outlet 122 for closing or opening the corresponding material inlet 121 and the material outlet 122. In some embodiments, the two sets of sealing mechanisms 2 are identical in structure, and are alternatively described below.

As shown in fig. 3 and 4, the sealing mechanism 2 includes a sealing door unit 21 and a gas seal unit 22. Wherein, the air sealing unit 22 is arranged at one side of the sealing door unit 21 close to the inside of the heat exchange chamber 1. Wherein the sealing door unit 21 is used to form a mechanical seal at the material conveying port 12, and to block the air flow circulation inside and outside the heat exchange chamber 1. The air sealing unit 22 is used to form a positive pressure air flow, i.e. a high pressure air flow barrier, at the position of the material conveying port 12, so as to push the air flow inside the heat exchange chamber 1 close to the position of the material conveying port 12 to move towards the middle of the heat exchange chamber 1, and further prevent the heat inside the heat exchange chamber 1 from leaking to the outside of the heat exchange chamber 1.

As shown in fig. 4 and 5, in particular, the sealing door unit 21 includes a sealing door 211 and a lifting assembly 212. Wherein, the lifting assembly 212 is installed on the top of the heat exchange chamber 1 and is disposed above the material conveying port 12. The lifting assembly 212 is connected to the sealing door 211, so that the lifting assembly 212 drives the sealing door 211 to move up and down to close or open the material conveying port 12.

It will be appreciated that when the lifting assembly 212 lifts the sealing door 211 above the material transfer port 12, i.e., the sealing door 211 is offset from the material transfer port 12, the material transfer port 12 is opened. When the sealing door 211 is moved down to correspond to the material transfer port 12, the material transfer port 12 is closed.

The lifting assembly 212 may include a winch 212a and a wire rope 212b, one end of the wire rope 212b is wound on the winch 212a, and the other end of the wire rope 212b is fixedly connected to the top of the sealing door 211. The hoisting machine 212a winds and unwinds the wire rope 212b to raise and lower the sealing door 211.

In other embodiments, the lifting assembly 212 may be a lifting device such as a hoist.

As shown in fig. 4, the sealing door unit 21 further includes a pressing assembly 213 for pushing the sealing door 211 to move in a direction to approach the heat exchange chamber 1. The compressing assembly 213 is installed at a side of the sealing door 211 far from the heat exchange chamber 1, and the compressing assembly 213 is synchronously lifted and lowered along with the sealing door 211.

Specifically, the compression assembly 213 includes a weight 213a, a connecting rod 213c, and a mounting bracket 213 d. The mounting bracket 213d is fixedly mounted on the side of the sealing door 211 away from the heat exchange chamber 1. One end of the connecting rod 213c is connected to the weight 213 a. The other end of the connecting rod 213c is swingably mounted to the mounting bracket 213d through the mounting seat 213b such that the weight member 213a can approach or separate from the sealing door 211.

As shown in fig. 6, wherein a vertical distance from a connection point of the connection rod 213c and the mounting bracket 213d to the sealing door 211 is smaller than a vertical distance from a center of gravity of the weight member 213a to the sealing door 211. Thereby, the tensile force F of the connecting rod 213c to the weight 213a is made to be an obliquely upward force. To keep the weight 213a balanced, the pulling force F can be divided into a vertical upward force F₁And a force F in the horizontal direction₂And a force F₂Toward the sealing door 211. Thus, a thrust force F 'in the horizontal direction may be applied to the sealing door 211 by the weight 213 a'₂To push the sealing door 211 to the direction close to the heat exchange chamber 1, thereby ensuring that the sealing door 211 can abut against the material conveying port 12 of the heat exchange chamber 1, and avoiding the heat leakage caused by the separation of the sealing door 211 from the material conveying port 12.

In some embodiments, the hold-down assemblies 213 may be arranged in two sets side-by-side, wherein one set of hold-down assemblies 213 is held down on the other set of hold-down assemblies 213 to provide greater hold-down force on the sealing door 211, further ensuring that the sealing door 211 closes the material delivery port 12.

In an embodiment, the sealing door 211 may be formed by welding steel sections and steel plates. Of course, in some embodiments, the interior of the sealing door 211 may be filled with an insulating material to achieve the effect of thermal insulation.

Further, as shown in fig. 3, the air sealing unit 22 includes two spaced sealing curtains 221 and two sets of high pressure air nozzles 222. Specifically, the sealing curtain 221 is fixedly installed on one side of the sealing door 211 close to the heat exchange chamber 1, the sealing curtain 221 is annular, and the sealing curtain 221 is arranged around the edge of the sealing door 211. When the sealing mechanism 2 closes the material conveying port 12, the sealing curtain 221 abuts against the shell 11 of the heat exchange chamber 1, and the sealing curtain 221 correspondingly surrounds the circumferential direction of the material conveying port 12. A gap 223 is arranged between the two sealing curtains 221, and a high-pressure air nozzle 222 is arranged in the gap 223 between the two sealing curtains 221.

In some embodiments, the material delivery port 12 may be a rectangular opening and, correspondingly, the sealing curtain 221 may be a rectangular ring. The two sets of high pressure air nozzles 222 may be disposed on the upper and lower sides of the sealing curtain 221, respectively, and the two sets of high pressure air nozzles 222 are disposed opposite to each other, i.e. the air flows generated by the two sets of high pressure air nozzles 222 are convected to each other.

Of course, in other embodiments, the two sets of high pressure air nozzles 222 may be disposed on two sides of the sealing curtain 221, i.e. the left side and the right side.

As shown in FIG. 1, two sets of high pressure air nozzles 222 can be connected to the compressed air source 7 through hoses to supply compressed air to the high pressure air nozzles 222. Therefore, when the sealing mechanism 2 closes the material conveying port 12, two sets of high-pressure air nozzles 222 can form a high-pressure air flow barrier which is in mutual up-and-down convection at the position of the material conveying port 12, so as to block the high-temperature air in the heat exchange chamber 1 from overflowing outwards.

In other embodiments, the gas sealing unit 22 may be directly fixed to the outer edge of the material conveying port 12.

In some embodiments, sealing curtain 221 may be constructed of a high chromium nickel austenitic stainless steel mesh chain with a refractory fiber cloth lining inside.

It is understood that the waste heat recovery device may further include a control mechanism (not shown) for controlling the operation of each mechanism of the waste heat recovery device. The lifting assembly 212 and the high pressure nozzle 222 of the sealing mechanism 2 can be electrically connected to the control mechanism, and the control mechanism controls the working of the lifting assembly 212 and the high pressure nozzle 222. Of course, the high pressure nozzle 222 may alternatively be a high pressure nozzle having an electrically controlled valve.

In other embodiments, the waste heat recovery device can also be directly electrically connected to the main control mechanism of the hot rolling production line and is uniformly controlled by the main control mechanism of the hot rolling production line.

As shown in fig. 1, further, a gas delivery mechanism 3 is connected to the heat exchange chamber 1 for supplying low-temperature gas into the heat exchange chamber 1. Correspondingly, the heat exchange chamber 1 is further provided with an exhaust port 13 for exhausting the gas with higher temperature after the temperature in the heat exchange chamber 1 is raised.

In some specific embodiments, the gas delivery mechanism 3 can be a blower, the output end of the blower is communicated with the inside of the heat exchange chamber 1 to deliver the low-temperature gas to the inside of the heat exchange chamber 1, and the gas delivery mechanism 3 is electrically connected with the control mechanism. Meanwhile, the gas transmission mechanism 3 can also be used as a power source to push the gas in the heat exchange chamber 1 to flow, so that the gas with higher temperature after being heated flows towards the exhaust port 13 and is exhausted through the exhaust port 13. The exhaust port 13 may be connected to the waste heat utilization device 8 to recycle the recovered waste heat.

As shown in fig. 1, in some specific embodiments, the waste heat utilization device 8 may include a heat pipe waste heat boiler (not shown), in which the heat energy gas exchanges heat with water, and the water absorbs heat to generate corresponding medium-pressure steam and low-pressure steam, wherein the medium-pressure steam may be used for thermal power generation, and the low-pressure steam may be used for thermal deoxygenation of the heat pipe waste heat boiler itself. Therefore, multi-stage utilization of waste heat recovery is realized, the waste heat recovery utilization rate is improved, and energy is saved.

In some embodiments, a gas pipeline is disposed in the heat exchange chamber 1 and is communicated with the gas transmission mechanism 3, the gas pipeline may be disposed around the heat exchange chamber 1, and the gas pipeline is provided with a plurality of gas outlets. Thus, the low-temperature gas can be uniformly fed into the heat exchange chamber 1, and the efficiency and quality of heat exchange can be ensured.

In the heat exchange chamber 1, the temperature of the gas after heat exchange is raised, and the gas with higher temperature will gradually rise to the upper part of the heat exchange chamber 1 due to thermal expansion, so that the gas with higher temperature is located in the upper space in the heat exchange chamber 1, and the gas with lower temperature is located in the lower space in the heat exchange chamber 1.

Accordingly, in some embodiments, the connection position of the gas delivery mechanism 3 and the heat exchange chamber 1 may be disposed near the bottom end of the heat exchange chamber 1, and the gas outlet 13 for discharging the higher temperature gas may be disposed near the top end of the heat exchange chamber 1. Therefore, the low-temperature gas can be continuously fed from the bottom of the heat exchange chamber 1, and the low-temperature gas is heated after being subjected to heat exchange with the hot rolled steel 9, gradually moves towards the top of the heat exchange chamber 1 and is then discharged outwards through the exhaust port 13. Therefore, the low-temperature gas can be prevented from being discharged through the exhaust port 13 as much as possible, and the quality of the output high-temperature air can be ensured.

Since the temperature required for winding the hot rolled steel 9 is generally about 800 ℃, the temperature after winding the hot rolled steel 9 is also about 700 ℃. The temperature of the gas in the heat exchange chamber 1 may be raised to 500 to 600 c when the hot rolled steel 9 initially enters the heat exchange chamber 1. As the heat exchange continues, the residual heat of the hot rolled steel 9 gradually decreases, and the temperature of the gas which rises when the gas subsequently enters the heat exchange chamber 1 is subjected to heat exchange also gradually decreases.

In some embodiments, a corresponding temperature sensor (not shown) and a corresponding solenoid valve (not shown) are disposed at the exhaust port 13, and both the temperature sensor and the solenoid valve are electrically connected to the control mechanism. The temperature sensor can detect the temperature of the heat energy gas exhausted from the exhaust port 13, and the electromagnetic valve can be used for controlling the opening and closing of the exhaust port 13. During the exhaust process, when the temperature of the hot gas detected by the temperature sensor is lower than 300 ℃, the control mechanism can control the electromagnetic valve to close, and during the closing, the hot rolled steel 9 in the heat exchange chamber 1 can be replaced.

In the embodiment shown in fig. 1, a plurality of baffles 4 are further disposed in the heat exchange chamber 1 for guiding the airflow in the heat exchange chamber 1. Specifically, the guide plate 4 can be provided with two sets of, and every group all includes polylith guide plate 4, and polylith guide plate 4 with a set of can be parallel arrangement each other. The two groups of guide plates 4 are respectively arranged at two sides in the heat exchange chamber 1 and can be symmetrically arranged about the material conveying port 12. During operation, guide plate 4 can make the air current to the position of placing hot rolled steel 9 and flow to the gas carries out the heat exchange with hot rolled steel 9. In an embodiment, the baffle 4 may extend from the bottom of the heat exchange chamber 1 to the top of the heat exchange chamber 1.

As shown in fig. 1 and 2, the waste heat recovery apparatus further includes a material conveying mechanism 5 for conveying the hot rolled steel 9 into or out of the heat exchange chamber 1.

Specifically, the material conveying mechanism 5 comprises a track 51, a moving trolley 52 and a driving part 53, and the driving part 53 is electrically connected with the control mechanism. The rails 51 extend along the longitudinal direction of the heat exchange chamber 1, and the rails 51 penetrate the heat exchange chamber 1. Specifically, the track 51 is arranged along a connecting line of the material input port 121 and the material output port 122, and in the heat exchange chamber 1, the track 51 passes through between two groups of guide plates 4, and the guide plates 4 are all arranged to extend towards the track 51. Meanwhile, the rails 51 have a certain extension length outside both ends of the heat exchange chamber 1 to facilitate the loading and unloading operations.

The traveling carriage 52 is slidably mounted on the rail 51. The driving member 53 is connected with the moving trolley 52, and the driving member 53 is used for driving the moving trolley 52 to travel along the rail 51, so that the hot rolled steel 9 is conveyed. In some embodiments, the driver 53 may be driven by an electric motor, a hydraulic mechanism, or the like. In this embodiment, the driving member 53 is an electric motor.

The moving trolley 52 is further provided with a limiting support 521 for limiting and fixing the hot rolled steel 9, so that the hot rolled steel 9 is prevented from moving on the moving trolley 52 at will. In some embodiments, the limiting bracket 521 may be a V-shaped bracket, and one end of the opening is disposed toward the upper side of the moving trolley 52, so as to facilitate placing the hot rolled steel 9 into the limiting bracket 521, and stably limit the hot rolled steel 9.

In other embodiments, the limiting bracket 521 may also be a U-shaped bracket.

In the embodiment, the waste heat recovery device further comprises a hoisting mechanism 6 for hoisting hot rolled steel 9. Specifically, the hoisting mechanism 6 can be used for hoisting the hot rolled steel 9 with higher temperature after hot rolling to the movable trolley 52 from the coiling machine, and the hoisting mechanism 6 can also be used for hoisting the cooled hot rolled steel 9 to the finished product span position for storage from the movable trolley 52.

In the working process, after the hot rolled steel 9 is coiled, the hot rolled steel can be lifted to the movable trolley 52 at one end of the material inlet 121 from the coiling machine through the hoisting mechanism 6. The sealing mechanism 2 at the position of the material conveying port 12 is opened, and the moving trolley 52 drives the hot rolled steel 9 with higher temperature into the heat exchange chamber 1 under the driving of the driving piece 53. After feeding is completed, namely the material conveying mechanism 5 conveys a certain amount of hot rolled steel 9 into the heat exchange chamber 1, and the sealing mechanism 2 seals the material conveying ports 12 at the two ends of the heat exchange chamber 1. In the heat exchange chamber 1, the hot rolled steel 9 exchanges heat with gas with a lower temperature, the heated gas is sent into a heat pipe waste heat boiler to exchange heat with water so as to generate corresponding medium-pressure steam or low-pressure steam, wherein the medium-pressure steam can be used for thermal power generation, and the low-pressure steam can be used for thermal deoxygenation of the heat pipe waste heat boiler so as to realize secondary utilization of waste heat. After the hot rolled steel 9 in the heat exchange chamber 1 completes heat exchange, the material conveying ports 12 at the two ends of the heat exchange chamber 1 are opened, the moving trolley 52 continues to move forward under the action of the driving piece 53, the cooled hot rolled steel 9 is conveyed out of the heat exchange chamber 1, and meanwhile, the hot rolled steel 9 with higher temperature is continuously conveyed into the heat exchange chamber 1 for heat exchange. Illustratively, when the temperature sensor detects that the temperature of the discharged gas is lower than 300 ℃, the completion of the heat exchange can be determined, and then the control mechanism can control the components of the sealing mechanism 2, the material conveying mechanism 5 and the like to perform related actions. During the heat exchange, the hoisting mechanism 6 can hoist the cooled hot rolled steel 9 to the finished product span from the position of the movable trolley 52 for storage, and can also continue to hoist the coiled hot rolled steel 9 to the movable trolley 52 outside the end close to the material input port 121 from the coiler.

Of course, in other embodiments, the waste heat recovery device may include two sets of hoisting mechanisms 6, wherein one set of hoisting mechanism 6 may be used for hoisting the hot rolled steel 9 with higher temperature, i.e. hoisting the hot rolled steel 9 from the coiler to the moving trolley 52 outside the end close to the material input port 121. The other set of hoisting mechanism 6 can be used for hoisting the cooled hot rolled steel 9, namely hoisting the cooled hot rolled steel 9 to a finished product bay for storage by the movable trolley 52 outside the end close to the material output port 122.

EXAMPLE III

The embodiment also provides a hot rolling production line, which comprises the waste heat recovery device provided by the first embodiment or the second embodiment.

Wherein, the hot rolling production line can also comprise a heating furnace, a hot rolling mechanism and a coiler which are arranged in sequence. The strip steel heated by the heating furnace is conveyed to a hot rolling mechanism for hot rolling, and then is conveyed to a coiler to be coiled into a steel coil. The hot rolled steel 9 after being coiled can be sent into a waste heat recovery device for waste heat recovery, and the hot rolled steel 9 is cooled. The cooled hot rolled steel 9 can be transferred to a finished span for storage.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. The waste heat recovery device is used for recovering waste heat in hot rolled steel and is characterized by comprising a heat exchange chamber, wherein the hot rolled steel is subjected to heat exchange with gas in the heat exchange chamber to form heat energy gas;

2. The heat recovery device of claim 1, wherein the sealing mechanism includes a sealing door unit and a gas sealing unit; the air sealing unit is arranged on one side of the sealing door unit close to the interior of the heat exchange chamber;

3. The waste heat recovery device of claim 2, wherein the air sealing unit comprises two sets of high pressure air nozzles, and the two sets of high pressure air nozzles are arranged oppositely;

4. The waste heat recovery device of claim 2, wherein the sealing door unit comprises a sealing door and a lifting assembly, and the lifting assembly is used for driving the sealing door to lift to close or open the material conveying port.

5. The heat recovery device of claim 4, wherein the sealing door unit further comprises a compression assembly for urging the sealing door to move in a direction approaching the heat exchange chamber.

6. The waste heat recovery device of claim 5, wherein the compression assembly includes a weight, a mounting bracket, and a connecting rod; the mounting rack is fixedly mounted on one side, far away from the air sealing unit, of the sealing door; the counterweight is arranged on the mounting frame in a swinging manner through the connecting rod;

7. The waste heat recovery device of claim 1, wherein a plurality of baffles are further arranged in the heat exchange chamber at intervals, and the baffles are used for guiding the airflow in the heat exchange chamber.

8. The heat recovery device of claim 1, further comprising a material transfer mechanism for transferring hot rolled steel into or out of the heat exchange chamber;

9. The waste heat recovery device of claim 8, wherein the moving trolley is provided with a limiting bracket, and the limiting bracket is used for limiting the hot rolled steel.

10. A hot rolling line comprising the waste heat recovery apparatus of any one of claims 1 to 9.