Steel heating furnace energy-saving system based on heat accumulating type combustion

Abstract

The invention relates to a steel heating furnace energy-saving system based on heat accumulating type combustion, which is applied to the related technical field of heating furnaces and is characterized in that through cooperative arrangement of a regulation and control module, a waste heat recovery module, a furnace body module and a leakage recovery module, energy conservation can be realized jointly from the aspects of fuel use, heat recovery, heat diffusion inhibition and the like; compared with the prior art, the energy-saving effect is greatly improved, the energy consumption is reduced, under the arrangement of the sealing detection unit, the air leakage situation can be detected in time, after the air leakage situation occurs, self-adaptive sealing compensation can be directly conducted on the air leakage position, overflowing hot air is guided into the exhaust pipe, and therefore the air leakage situation is avoided. Flue gas discharged along with the heating furnace passes through the boiler or the heat exchanger to be subjected to waste heat recovery, and compared with the mode that the flue gas is directly discharged into air, heat loss is greatly reduced, and the influence of air leakage on energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to an energy-saving system, and in particular to an energy-saving system for a steel heating furnace based on regenerative combustion, which is applied in the technical field related to heating furnaces. Background Art

[0002] In the steel industry, heating furnaces are essential and important equipment for heating steel billets to the appropriate rolling or forging temperature. However, traditional steel heating furnaces present numerous operational issues, among which excessive energy consumption is a key issue that needs to be addressed urgently. Traditional heating furnaces have low combustion efficiency, and large amounts of heat energy are directly discharged into the atmosphere along with high-temperature flue gases, resulting in not only a significant waste of energy but also significant thermal and exhaust gas pollution. Statistics show that energy costs account for a significant proportion of the total cost of steel production, and heating furnace energy consumption accounts for a significant proportion of overall steel production energy consumption. Therefore, reducing heating furnace energy consumption and improving energy utilization are of great significance for steel companies in reducing production costs, enhancing market competitiveness, and achieving sustainable development.

[0003] Currently, although some steel companies have implemented measures to improve heating furnace energy conservation, such as optimizing furnace structure and improving burners, the energy-saving effects remain unsatisfactory. For example, some heating furnaces reduce heat loss by increasing the thickness of the furnace insulation layer, but the recovery and utilization of high-temperature flue gas waste heat is still insufficient. For example, Chinese Patent Specification No. CN113048801B discloses a waste heat recovery control method for a hot rolling heating furnace, and Chinese Patent Specification No. CN105953248B discloses a waste heat recovery system for a steel rolling heating furnace. Although waste heat recovery is implemented, heating furnaces are prone to air leakage at the furnace mouth. When air leaks, some heat escapes. To maintain normal production needs, more fuel is required to maintain a stable temperature inside the furnace. Once air leaks occur, it is difficult to open the furnace to perform maintenance at the furnace mouth due to the ongoing production and the high temperature at the leaking area. Maintenance generally requires at least the completion of steel operations within the furnace. During this period, the heat that escapes leads to an invisible increase in energy consumption. In addition, some existing energy-saving technologies often require large-scale transformation of heating furnaces, which has high investment costs and is difficult to implement. The transformation process will also affect normal production progress, making many steel companies hesitant in adopting these technologies. Summary of the Invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when air leakage occurs, part of the heat will be directly wasted, and the prior art does not reasonably recycle and utilize this part of the heat.

[0005] To solve the above problems, the present invention provides an energy-saving system for a steel heating furnace based on regenerative combustion, comprising a control module, a waste heat recovery module, a furnace module, and a leakage recovery module. The control module comprises a control center, a sensor group, and a data analysis and processing unit. The waste heat recovery module is connected to a boiler and a heat exchanger on the exhaust pipe of the heating furnace, and two sets of independent heat storage bodies located in the heating furnace. The two sets of heat storage bodies are respectively located in the heat storage chambers of two independent heating furnaces. The air supply pipe and the exhaust pipe of the flue gas of the heating furnace are both connected to the bottom of the two heat storage chambers through bronchial pipes. An air intake valve is installed on the bronchial pipe corresponding to the air supply pipe, and an exhaust valve is installed on the bronchial pipe corresponding to the exhaust pipe. Both the air intake valve and the exhaust valve are connected to the control center signal. The furnace body module includes a furnace body insulation unit and a furnace mouth sealing unit. The leakage recovery module includes a sealing detection unit installed on the furnace mouth sealing unit and a recovery pipeline connected between the sealing detection unit and the exhaust pipe. The sealing detection unit includes an annular electric slide rail installed on the outer end of the sealed furnace door, an electric slider installed on the annular electric slide rail, an electric push rod fixedly connected to the upper end of the electric slider through an electric rotating shaft, an extension pipe fixedly connected to the extended end of the electric push rod, and a conical monitoring hood fixedly connected to the lower end of the extension pipe. The conical monitoring hood is facing the door gap of the sealed furnace door. An adaptive sealing ring is fixedly connected to the outer end of the conical monitoring hood, and the lower end of the adaptive sealing ring is higher than the bottom of the conical monitoring hood. A gas flowmeter is installed at the extension pipe. The recovery pipeline includes a ceramic bellows fixedly connected to the extension pipe, an air duct fixedly connected to the exhaust pipe, and the ceramic bellows and the air duct are fixed to each other, and the conical monitoring hood, extension pipe, ceramic bellows, and air duct are connected in sequence.

[0006] In the above-mentioned energy-saving system of the steel heating furnace based on regenerative combustion, energy saving can be achieved from various aspects such as fuel use, heat recovery, and suppression of heat diffusion through the coordinated setting of the control module, the waste heat recovery module, the furnace body module, and the leakage recovery module. Compared with the existing technology, the energy-saving effect is greatly improved and energy consumption is reduced. Moreover, under the setting of the sealing detection unit, air leakage can be detected in time. After the air leakage occurs, the air leakage can be directly adaptively sealed and compensated, and the overflowed hot air can be introduced into the exhaust pipe, and the waste heat is recovered through the boiler or heat exchanger together with the flue gas discharged from the heating furnace. Compared with direct discharge into the air, the heat loss is greatly reduced, and the impact of air leakage on energy consumption is reduced.

[0007] As a further improvement of the present application, the sensor group includes but is not limited to an air pressure sensor, a temperature sensor, a gas flow sensor, and an oxygen content sensor.

[0008] As a further improvement of the present application, the furnace mouth sealing unit includes a double-layer hydraulically driven sealed furnace door controlled by a micro-positive pressure, the furnace body insulation unit includes a multi-layer furnace body, and the furnace body and the sealed furnace door both include a ceramic fiber lining and a stainless steel outer shell.

[0009] As a further improvement of the present application, the adaptive sealing ring includes a fixed base ring fixedly connected to the outer end of the conical monitoring cover, a dynamic sealing ring movably sleeved on the outer end of the fixed base ring, and multiple telescopic rods fixedly connected between the fixed base ring and the dynamic sealing ring. Multiple vertical slide rails are also installed at the outer end of the conical monitoring cover, and the inner wall of the dynamic sealing ring is fixedly connected to the sliding parts on the vertical slide rails.

[0010] As a further improvement of the present application, the dynamic sealing ring includes a fixed lining plate, a dynamic lining plate and an external deformable thermal insulation sleeve wrapped around the two non-contacting plates, the fixed lining plate and the top and side ends of the external deformable thermal insulation sleeve are in contact with and fixed to each other, the dynamic lining plate and the inner bottom of the external deformable thermal insulation sleeve are in contact with each other, and the telescopic rod passes through the external deformable thermal insulation sleeve and the fixed lining plate and is in contact with the dynamic lining plate.

[0011] As a further improvement of the present application, the lower end of the fixed section of the telescopic rod is located between the fixed lining plate and the external deformable thermal insulation sleeve, and a sealing layer is fixedly connected to the outer surface of the fixed section, and the distance between the lower end of the fixed section and the lower surface of the fixed lining plate is not less than the distance between the bottom of the external deformable thermal insulation sleeve and the lower end of the conical monitoring cover.

[0012] As a further improvement of the present application, the external deformable thermal insulation sleeve is a flexible and sealed multi-layer structure, and the multi-layer structure is composed of an outer ceramic fiber cloth layer, a metal foil interlayer and a refractory wool layer from the outside to the inside; the dynamic lining is a high-temperature resistant structure with multiple transparent holes, and the external deformable thermal insulation sleeve is saturated with an inner lining fluid.

[0013] As another improvement of the present application, a pneumatic ring bag is fixedly connected between the fixed base ring and the dynamic sealing ring, and a plurality of air guide holes are opened at the outer end of the conical monitoring cover. The plurality of air guide holes are all connected to the pneumatic ring bag, and the dynamic sealing ring and the outer deflective insulation sleeve are made of the same material, and the pneumatic ring bag is in a relaxed state.

[0014] In summary, through the coordinated setting of the control module, the waste heat recovery module, the furnace body module and the leakage recovery module, energy saving can be achieved from various aspects such as fuel use, heat recovery, and suppression of heat diffusion. Compared with the existing technology, the energy saving effect is greatly improved and energy consumption is reduced. In addition, under the setting of the sealing detection unit, air leakage can be detected in time. After the air leakage occurs, the air leakage can be directly adaptively sealed and compensated, and the overflowed hot air can be introduced into the exhaust pipe. Together with the flue gas discharged from the heating furnace, it passes through the boiler or heat exchanger for waste heat recovery. Compared with direct discharge into the air, the heat loss is greatly reduced, and the impact of air leakage on energy consumption is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a module block diagram of the first embodiment of this application; Figure 2 This is a partial schematic diagram of a heat storage body in a heating furnace according to the first embodiment of the present application; Figure 3 This is a schematic diagram of the waste heat recovery module portion of the first embodiment of the present application; Figure 4 A perspective view of a heating furnace according to a first embodiment of the present application; Figure 5 A top view of a heating furnace according to a first embodiment of the present application; Figure 6 This is a three-dimensional view of the sealed furnace door of the first embodiment of the present application; Figure 7 A perspective view of a leakage recovery module according to a first embodiment of the present application; Figure 8 This is a front view of the conical monitoring cover according to the first embodiment of the present application; Figure 9 This is a schematic diagram of the conical monitoring hood according to the first embodiment of the present application when collecting hot air from the air leak at the sealed furnace door; Figure 10 This is a cross-sectional view of the adaptive sealing ring portion of the first embodiment of the present application; Figure 11 This is a diagram showing the process changes of the adaptive sealing ring in the first embodiment of the present application when locally sealing the edge of the air leakage area; Figure 12 This is a cross-sectional view of the adaptive sealing ring portion of the second embodiment of the present application; Figure 13 This is a cross-sectional view of the adaptive sealing ring portion when there is local air leakage at the sealed furnace door in the second embodiment of the present application.

[0016] Description of the numbers in the figure: 1 sealed furnace door, 101 annular electric slide rail, 2 sealing detection unit, 31 ceramic bellows, 32 air guide tube, 21 electric slider, 22 electric push rod, 23 extension tube, 4 conical monitoring cover, 401 air guide hole, 5 adaptive sealing ring, 51 fixed base ring, 52 dynamic sealing ring, 53 telescopic rod, 54 pneumatic ring bag, 501 vertical slide rail, 521 fixed lining plate, 522 dynamic lining plate, 523 external variable thermal insulation sleeve. DETAILED DESCRIPTION

[0017] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0018] The first implementation method: Figure 1It is shown that the energy-saving system of the steel heating furnace based on thermal storage combustion includes a control module, a waste heat recovery module, a furnace body module and a leakage recovery module. The control module includes a control center, a sensor group and a data analysis and processing unit. The sensor group includes but is not limited to an air pressure sensor, a temperature sensor, a gas flow sensor, and an oxygen content sensor. The sensor group can monitor the combustion of the fuel in the heating furnace in real time, so that the control center can adjust the fuel feed amount, oxygen supply amount, etc. in time to achieve full combustion of the fuel and reduce energy consumption. The waste heat recovery module is connected to the boiler and heat exchanger on the exhaust pipe of the heating furnace and two groups of independent heat storage bodies located in the heating furnace.

[0019] like Figure 2 , the two groups of heat storage bodies are respectively located in the heat storage chambers of two independent heating furnaces, wherein the two heat storage chambers are located below the combustion chamber of the heating furnace, and both are communicated with the combustion chamber. The air supply pipe of the heating furnace and the exhaust pipe of the flue gas are communicated with the bottom of the two heat storage chambers through bronchial pipes. An intake valve is installed on the bronchial pipe corresponding to the air supply pipe, and an exhaust valve is installed on the bronchial pipe corresponding to the exhaust pipe. The intake valve and the exhaust valve are both connected to the control center signal. It is worth noting that the intake valve and exhaust valve corresponding to the same heat storage chamber are not opened at the same time, and the two intake valves are not opened at the same time, and the two exhaust valves are not opened at the same time. When in use, when the intake valve is in the open state, the exhaust valve is in the closed state. At this time, the intake valve corresponding to the other heat storage chamber is in the closed state, and the exhaust valve is in In the open state, air enters the heat storage chamber with the air intake valve in the open state through the fan. At this time, the air passes through the heat storage body that absorbs a large amount of heat and is preheated. Then it enters the combustion chamber and is fully mixed with the fuel and burned. The flue gas then carries a large amount of heat, enters the heat storage chamber on the other side, passes through the heat storage body and is discharged. At this time, the corresponding heat storage body absorbs and recovers the heat in the flue gas. During use, the opening and closing states of the air intake valves and exhaust valves corresponding to the two heat storage chambers are continuously changed alternately, so that the air is always preheated before entering the combustion chamber, and the flue gas is always adsorbed by the heat storage body for waste heat before being discharged. The exhausted flue gas enters the boiler or heat exchanger along the exhaust pipe, and then the waste heat is secondary recovered and adsorbed. Compared with the existing technology, it can effectively avoid the occurrence of incomplete waste heat recovery.

[0020] It is worth noting that one or more heat exchangers and waste heat boilers can be set up according to actual needs to fully recover the heat in the flue gas, thereby making full use of the thermal energy of the fuel and effectively improving the energy saving effect.

[0021] like Figure 4-5The furnace body module includes a furnace body insulation unit and a furnace mouth sealing unit, and the leakage recovery module includes a sealing detection unit 2 installed on the furnace mouth sealing unit and a recovery pipeline connected between the sealing detection unit 2 and the exhaust pipe, such as Figure 6 The sealing detection unit 2 includes an annular electric slide rail 101 installed at the outer end of the sealed furnace door 1, an electric slider 21 installed on the annular electric slide rail 101, an electric push rod 22 fixedly connected to the upper end of the electric slider 21 through an electric rotating shaft, an extension pipe 23 fixedly connected to the extended end of the electric push rod 22, and a conical monitoring cover 4 fixedly connected to the lower end of the extension pipe 23, the conical monitoring cover 4 is facing the door gap of the sealed furnace door 1, an adaptive sealing ring 5 is fixedly connected to the outer end of the conical monitoring cover 4, and the lower end of the adaptive sealing ring 5 is higher than the bottom of the conical monitoring cover 4, a gas flow meter is installed at the extension pipe 23, and a recycling pipeline includes a ceramic bellows 31 fixedly connected to the extension pipe 23, and an air guide pipe 32 fixedly connected to the exhaust pipe, and the ceramic bellows 31 and the air guide pipe 32 are fixed to each other, wherein the air guide pipe 32 is provided with an electromagnetic valve, and the conical monitoring cover 4, the extension pipe 23, the ceramic bellows 31, and the air guide pipe 32 are fixedly connected to the exhaust pipe. The two are connected. When in use, the bottom of the electric shaft control 33 can be rotated so that the conical monitoring hood 4 is located just above the door gap of the sealed furnace door 1, and then the electric slider 21 is controlled to rotate around the sealed furnace door 1 along the annular electric slide rail 101, so that the conical monitoring hood 4 passes through the door gap of the sealed furnace door 1 in turn. When local damage and air leakage occur, when the conical monitoring hood 4 passes through the place, the leaked air flow rushes into the conical monitoring hood 4, which will cause the gas flow meter to detect obvious data fluctuations, thereby judging that local air leakage has occurred. At this time, the solenoid valve can be controlled to open, and the electric push rod 22 can be controlled to shorten at the same time, so that the conical monitoring hood 4 moves down and gradually approaches the air leakage place, so that the conical monitoring hood 4 temporarily covers the air leakage place, so that the high-temperature gas blown out of the air leakage place can be recovered along the conical monitoring hood 4 and the recycling pipeline, instead of directly leaking into the air, thereby effectively reducing the energy loss when air leakage occurs, and achieving the effect of energy saving.

[0022] In the above-mentioned energy-saving system of the steel heating furnace based on regenerative combustion, energy saving can be achieved from various aspects such as fuel use, heat recovery, and suppression of heat diffusion through the coordinated setting of the control module, the waste heat recovery module, the furnace body module, and the leakage recovery module. Compared with the existing technology, the energy-saving effect is greatly improved and energy consumption is reduced. Moreover, under the setting of the sealing detection unit 2, air leakage can be detected in time. After the air leakage occurs, the air leakage can be directly adaptively sealed and compensated, and the overflowed hot air can be introduced into the exhaust pipe, and the waste heat is recovered through the boiler or heat exchanger together with the flue gas discharged from the heating furnace. Compared with direct discharge into the air, the heat loss is greatly reduced, and the impact of air leakage on energy consumption is reduced.

[0023] The furnace mouth sealing unit includes a double-layer hydraulically driven sealed furnace door 1 controlled by a slightly positive pressure, which effectively ensures the sealing effect and reduces the probability of air leakage. The furnace body insulation unit includes a multi-layer furnace body, and the furnace body and the sealed furnace door both include a ceramic fiber lining and a stainless steel shell, so that the thermal insulation effect is good. When in use, heat is not easy to spread from the furnace body to the outside.

[0024] like Figure 7-8 The adaptive sealing ring 5 includes a fixed base ring 51 fixedly connected to the outer end of the conical monitoring cover 4, a dynamic sealing ring 52 movably sleeved on the outer end of the fixed base ring 51, and a plurality of telescopic rods 53 fixedly connected between the fixed base ring 51 and the dynamic sealing ring 52. In this embodiment, the telescopic rods 53 are electric push rods, which can automatically control whether the lower surface of the dynamic sealing ring 52 is flexible or rigid. A plurality of vertical slide rails 501 are also installed at the outer end of the conical monitoring cover 4. In this embodiment, the vertical slide rails 501 are electric slide rails, which can automatically control the dynamic sealing ring 52 to move up and down through the control center. The inner wall of the dynamic sealing ring 52 is fixedly connected to the sliding member on the vertical slide rail 501, and the fixing points of the two are located at the outer variable thermal insulation sleeve 523 corresponding to the fixed lining plate 521.

[0025] like Figure 10 The dynamic sealing ring 52 includes a fixed lining plate 521 and a dynamic lining plate 522 that are not in contact with each other, and an external degradable heat insulating sleeve 523 wrapped around the fixed lining plate 521 and the top and side ends of the external degradable heat insulating sleeve 523 are in contact with each other and fixed, and the dynamic lining plate 522 is in contact with the inner bottom of the external degradable heat insulating sleeve 523. The telescopic rod 53 passes through the external degradable heat insulating sleeve 523 and the fixed lining plate 521 and is in contact with the dynamic lining plate 522. Figure 11 When air leakage occurs, the electric push rod 22 is first controlled to shorten so that the lower surface of the conical monitoring cover 4 contacts the upper surface of the sealed furnace door 1, and then the telescopic rod 53 is controlled to shorten so that the dynamic lining plate 522 gradually moves upward. At this time, the lining fluid gradually passes through the dynamic lining plate 522 and enters below it, making the lower end of the dynamic lining plate 522 relatively stable and flexible. Then, the vertical slide rail 501 is used to control the dynamic sealing ring 52 to move downward as a whole, and the telescopic rod 53 is controlled to extend synchronously so that the dynamic sealing ring 52 is in contact with the dynamic lining plate 522 and the fixed lining plate. The plate 521 moves downward without changing its relative position until the lower surface of the dynamic sealing ring 52 is in direct contact with the outer contour of the sealed furnace door 1 and gradually becomes flexible, so that the dynamic sealing ring 52 can adapt to the shape of the contour of the door gap of the sealed furnace door 1 and deform, thereby effectively sealing the outer edge of the conical monitoring cover 4 and the air leakage, thereby temporarily creating a relatively sealed environment, so that the leaked hot air can be recovered along the ceramic bellows 31 and the air guide pipe 32, greatly reducing the heat loss in this case and improving the energy saving effect.

[0026] The lower end of the fixed section of the telescopic rod 53 is located between the fixed lining plate 521 and the external degradable thermal insulation sleeve 523, and a sealing layer is fixedly connected to the outer surface of the fixed section, so that the lining fluid is not easy to leak from the contact point between the telescopic rod 53 and the dynamic sealing ring 52, and the distance between the lower end of the fixed section and the lower surface of the fixed lining plate 521 is not less than the distance between the bottom of the external degradable thermal insulation sleeve 523 and the lower end of the conical monitoring cover 4, which effectively ensures that when the external degradable thermal insulation sleeve 523 protrudes from the bottom of the conical monitoring cover 4, the fixed end of the telescopic rod 53 is still in contact with the fixed lining plate 521, so that the contact part of the two is not easy to become its telescopic section, effectively avoiding overflow of the lining fluid due to the reduction of the inner diameter.

[0027] The external degenerative thermal insulation sleeve 523 is a flexible and sealed multi-layer structure, and the multi-layer structure is composed of an outer ceramic fiber cloth layer, a metal foil interlayer such as molybdenum foil and a refractory wool layer from the outside to the inside, so that the external degenerative thermal insulation sleeve 523 has a good thermal insulation effect, and the lining fluid inside it is not easily affected by high temperature and is not easily degenerated due to high temperature; the dynamic lining 522 is a high-temperature resistant structure with multiple transparent holes, so that the lining fluid of the dynamic lining 522 can flow up and down the dynamic lining 522, thereby facilitating the change of the soft and hard deformation of the lower end of the dynamic sealing ring 52, and facilitating better adaptation to the shape of the door gap. When the temperature is locally lowered, the sealing effect of the contact part between the conical monitoring cover 4 and the sealed furnace door 1 door gap is better, so that the recovery effect of the leaked hot air is better, and it is not easy for part of the air to leak into the air. The external degenerative thermal insulation sleeve 523 is saturated with the lining fluid, and the lining fluid can be an inert gas or an inert fluid.

[0028] It's worth noting that the lining fluid can also be an electrorheological fluid, depending on actual needs. When the lower end of the dynamic sealing ring 52 contacts the surface of the door gap, the electrorheological fluid can be energized to harden it, thereby hardening the adaptive sealing ring 5 and ensuring full contact with the sealed furnace door 1. This further enhances the stability of the contact point, preventing deformation caused by pressure fluctuations and the escape of hot air. This is an optional setting and is not required.

[0029] In summary, through the coordinated setting of the control module, the waste heat recovery module, the furnace body module and the leakage recovery module, energy saving can be achieved from various aspects such as fuel use, heat recovery, and suppression of heat diffusion. Compared with the existing technology, the energy saving effect is greatly improved and energy consumption is reduced. In addition, under the setting of the sealing detection unit 2, air leakage can be detected in time. After the air leakage occurs, the air leakage can be directly adaptively sealed and compensated, and the overflowed hot air can be introduced into the exhaust pipe, and the waste heat is recovered through the boiler or heat exchanger together with the flue gas discharged from the heating furnace. Compared with direct discharge into the air, the heat loss is greatly reduced, and the impact of air leakage on energy consumption is reduced.

[0030] The second implementation method: Based on the first embodiment, this embodiment adds a pneumatic ring bag 54 and makes corresponding changes to some of its structures. Specifically, in this embodiment, the vertical slide rail 501 is a common slide rail, the telescopic rod 53 is an elastic telescopic rod, and the telescopic rod 53 is directly fixed to the upper end of the dynamic sealing ring 52, and no dynamic lining plate 522 is provided on the dynamic sealing ring 52. The rest of the parts are consistent with the first embodiment.

[0031] Figure 10 It is shown that a pneumatic ring bag 54 is fixedly connected between the fixed base ring 51 and the dynamic sealing ring 52, and a plurality of air guide holes 401 are opened at the outer end of the conical monitoring cover 4. The plurality of air guide holes 401 are all communicated with the pneumatic ring bag 54, and the dynamic sealing ring 52 and the outer deformable heat insulation sleeve 523 are made of the same material. The pneumatic ring bag 54 is in a relaxed state. When air leakage occurs, the electric push rod 22 controls the lower end of the conical monitoring cover 4 to contact the sealed furnace door 1. After the leaked hot air enters the conical monitoring cover 4, part of the hot air enters the pneumatic ring bag 54 along the air guide holes 401, causing the pneumatic ring bag 54 to gradually stretch, thereby causing the dynamic sealing ring 52 to gradually move downward and flexibly contact the surface of the sealed furnace door 1, achieving the effect of adaptive sealing, and also enabling the leaked hot air to be efficiently recovered.

[0032] In the first embodiment, the dynamic lining plate 522 is set. When the dynamic sealing ring 52 conflicts with the sealed furnace door 1, it can serve as an inner lining to improve the stability of the lower half of the external variable thermal insulation sleeve 523, thereby compensating for the instability of the external variable thermal insulation sleeve 523 caused by the instability of the inner lining fluid. In this embodiment, the stability of the external variable thermal insulation sleeve 523 is relatively weaker. However, the entire change process of the dynamic sealing ring 52 is only achieved by the effect of the leaked hot air, without the need for additional energy consumption control, which is more in line with the concept of energy saving. In specific implementation, a suitable implementation method can be selected according to actual needs.

[0033] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. The energy-saving system for steel heating furnace based on regenerative combustion is characterized by: It includes a control module, a waste heat recovery module, a furnace module and a leakage recovery module. The control module includes a control center, a sensor group and a data analysis and processing unit. The waste heat recovery module is connected to the boiler, the heat exchanger and the two independent heat storage bodies located in the heating furnace on the exhaust pipe of the heating furnace. The two groups of heat storage bodies are respectively located in the heat storage chambers of two independent heating furnaces. The air supply pipe and the flue gas exhaust pipe of the heating furnace are both connected to the bottom of the two heat storage chambers through bronchial pipes. The bronchial pipe corresponding to the air supply pipe is equipped with an air intake valve, and the bronchial pipe corresponding to the exhaust pipe is equipped with an exhaust valve. The air intake valve and the exhaust valve are both connected to the control center signal. The furnace body module includes a furnace body insulation unit and a furnace mouth sealing unit, the leakage recovery module includes a sealing detection unit (2) installed on the furnace mouth sealing unit and a recovery pipeline connected between the sealing detection unit (2) and the exhaust pipe, the sealing detection unit (2) includes an annular electric slide rail (101) installed at the outer end of the sealed furnace door (1), an electric slider (21) installed on the annular electric slide rail (101), an electric push rod (22) fixedly connected to the upper end of the electric slider (21) through an electric rotating shaft, an extension pipe (23) fixedly connected to the extended end of the electric push rod (22), and a lower end of the extension pipe (23) fixedly connected to the lower end of the extension pipe (23). The conical monitoring hood (4) is directly opposite to the door gap of the sealed furnace door (1); the outer end of the conical monitoring hood (4) is fixedly connected to an adaptive sealing ring (5), and the lower end of the adaptive sealing ring (5) is higher than the bottom of the conical monitoring hood (4); a gas flow meter is installed at the extension pipe (23); the recycling pipeline includes a ceramic bellows (31) fixedly connected to the extension pipe (23) and an air guide pipe (32) fixedly connected to the exhaust pipe, and the ceramic bellows (31) and the air guide pipe (32) are fixed to each other, and the conical monitoring hood (4), the extension pipe (23), the ceramic bellows (31), and the air guide pipe (32) are sequentially connected.

2. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 1, characterized in that: The sensor group includes but is not limited to an air pressure sensor, a temperature sensor, a gas flow sensor, and an oxygen content sensor.

3. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 1, characterized in that: The furnace mouth sealing unit includes a double-layer hydraulically driven sealed furnace door controlled by a slight positive pressure, the furnace body heat preservation unit includes a multi-layer furnace body, and both the furnace body and the sealed furnace door include a ceramic fiber lining and a stainless steel shell.

4. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 1, characterized in that: The adaptive sealing ring (5) comprises a fixed base ring (51) fixedly connected to the outer end of the conical monitoring cover (4), a dynamic sealing ring (52) movably sleeved on the outer end of the fixed base ring (51), and a plurality of telescopic rods (53) fixedly connected between the fixed base ring (51) and the dynamic sealing ring (52). The outer end of the conical monitoring cover (4) is also equipped with a plurality of vertical slide rails (501), and the inner wall of the dynamic sealing ring (52) is fixedly connected to the sliding member on the vertical slide rail (501).

5. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 4 is characterized in that: The dynamic sealing ring (52) includes a fixed lining plate (521) and a dynamic lining plate (522) that are not in contact with each other, and an external deflectable heat-insulating sleeve (523) wrapped around the fixed lining plate (521) and the external deflectable heat-insulating sleeve (523) at the top and side ends thereof, and is fixed to each other; the dynamic lining plate (522) and the inner bottom of the external deflectable heat-insulating sleeve (523) are in contact with each other; and the telescopic rod (53) passes through the external deflectable heat-insulating sleeve (523) and the fixed lining plate (521) and is in contact with the dynamic lining plate (522).

6. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 5, characterized in that: The lower end of the fixed section of the telescopic rod (53) is located between the fixed lining plate (521) and the external deflectable heat-insulating sleeve (523), and a sealing layer is fixedly connected to the outer surface of the fixed section. The distance between the lower end of the fixed section and the lower surface of the fixed lining plate (521) is not less than the distance between the bottom of the external deflectable heat-insulating sleeve (523) and the lower end of the conical monitoring cover (4).

7. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 6, characterized in that: The external degradable heat-insulating sleeve (523) is a flexible and sealed multi-layer structure, and the multi-layer structure is composed of an outer ceramic fiber cloth layer, a metal foil interlayer (such as molybdenum foil), and a fire-resistant cotton layer from the outside to the inside; the dynamic lining (522) is a high-temperature resistant structure with multiple transparent holes, and the external degradable heat-insulating sleeve (523) is saturated with a lining fluid.

8. The energy-saving system for steel heating furnaces based on regenerative combustion according to claim 7, characterized in that: A pneumatic ring bag (54) is fixedly connected between the fixed base ring (51) and the dynamic sealing ring (52). A plurality of air guide holes (401) are drilled at the outer end of the conical monitoring cover (4). The plurality of air guide holes (401) are all in communication with the pneumatic ring bag (54). The dynamic sealing ring (52) and the outer degenerative heat insulation sleeve (523) are made of the same material, and the pneumatic ring bag (54) is in a relaxed state.

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