Energy-saving device of converter flue gas dust removal system

Abstract

The utility model provides an energy-saving device of a converter flue gas dust removal system, which comprises a plurality of heat pipes arranged on the outer side of a converter in a surrounding manner, a first heat exchange medium circularly flows in the heat pipes, and low-temperature heat exchange ends of the heat pipes are arranged close to an outlet of the converter; and the heat exchanger is arranged at the high-temperature heat exchange end of the heat pipe, and a second heat exchange medium capable of exchanging heat with the first heat exchange medium is introduced into the heat exchanger. According to the energy-saving device of the converter flue gas dust removal system, efficient recovery of secondary flue gas waste heat can be achieved, the flue gas volume flow is reduced by reducing the temperature of secondary flue gas, and then the operation load of the whole system in the secondary dust removal process of a converter is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, and in particular to an energy-saving device for a converter flue gas dust removal system, which also has a flue gas waste heat recovery function. Background Art

[0002] The converter uses molten iron and scrap steel as the main raw materials. The steelmaking process is completed in the converter without the help of external energy sources, relying on the physical heat of the molten iron itself and the heat generated by the chemical reaction between the components of the molten iron to complete the steelmaking process. The converter secondary dust removal system is used to capture and purify the flue gas generated during converter smelting, as well as the flue gas generated during operations such as adding molten iron, adding scrap steel, and tapping molten steel to avoid polluting the environment. The converter has a fast production speed and a high output per furnace. The converter secondary dust removal system collects and processes a large amount of high-temperature flue gas, and the energy consumption is very high. The existing converter secondary dust removal system rarely recovers the waste heat of the flue gas. There are a small number of applications for recovering the waste heat of the flue gas, but due to the addition of a heat exchanger to the flue gas pipeline, the efficiency of this method in recovering the waste heat of the secondary flue gas is relatively low. Utility Model Content

[0003] The utility model aims to provide an energy-saving device for a converter flue gas dust removal system, which reduces the temperature of the secondary flue gas by recovering the waste heat of the secondary flue gas, thereby reducing the operating load of the entire dust removal system during the converter secondary dust removal process.

[0004] The utility model provides an energy-saving device for a converter flue gas dust removal system, which comprises:

[0005] A plurality of heat pipes are arranged around the outside of the converter, a first heat exchange medium circulates in the heat pipes, and a low-temperature heat exchange end of the heat pipe is arranged close to the outlet of the converter;

[0006] The heat exchanger is arranged at the high-temperature heat exchange end of the heat pipe, and the second heat exchange medium capable of exchanging heat with the first heat exchange medium flows through the heat exchanger.

[0007] The energy-saving device of the converter flue gas dust removal system described in the utility model recovers the heat of the secondary flue gas by means of a plurality of heat pipes arranged around the outside of the converter outlet. The secondary flue gas generated at the converter outlet can directly exchange heat and cool down with the heat pipes. By lowering the temperature of the secondary flue gas, after the secondary flue gas is cooled, the volume flow rate is reduced, the flue gas flow velocity in the flue is reduced, the flue gas resistance is reduced, and at the same time, the flow rate passing through the fan is reduced, the operating power consumption is reduced, thereby reducing the operating load of the converter flue gas dust removal system. For the existing dust removal equipment, it is beneficial to tap the potential of the equipment and improve the secondary dust removal effect of the converter.

[0008] In a preferred embodiment of the present invention, a closed cover is provided on the outside of the converter, a relatively closed dust collecting space is formed in the closed cover, the low-temperature heat exchange end of the heat pipe is located in the dust collecting space, and the high-temperature heat exchange end of the heat pipe is located on the outside of the closed cover.

[0009] A closed hood is set up to seal the space outside the converter to form a relatively closed dust collecting space. On the one hand, it can ensure that the secondary flue gas can fully exchange heat with the heat pipe in the dust collecting space. On the other hand, it can also ensure that the secondary flue gas can be collected through the pipeline after heat exchange to avoid the escape of the secondary flue gas.

[0010] In a preferred embodiment of the present invention, a smoke exhaust hood is provided at the front end of the enclosed hood, the smoke exhaust hood is connected to a converter secondary dust removal duct, and the second dust removal duct is located outside the enclosed hood.

[0011] The exhaust hood and the converter secondary dust removal duct connected to the exhaust hood can collect the flue gas after heat exchange to prevent the flue gas from being directly discharged into the atmosphere and causing pollution.

[0012] In a preferred embodiment of the present invention, the smoke exhaust hood is a door-shaped structure, and the smoke exhaust hood is arranged close to the front end of the closed hood.

[0013] In a preferred embodiment of the present invention, a front end of the enclosed cover and a rear end of the enclosed cover are respectively provided with a front fire-blocking door and a rear fire-blocking door.

[0014] The front fire-blocking door and the rear fire-blocking door of the furnace can be opened when the converter rotates, providing necessary avoidance space for the rotation of the converter, so that the converter will not interfere with the front side wall and the rear side wall of the closed cover during the rotation process.

[0015] In a preferred embodiment of the present invention, a smoke exhaust port is provided at the rear end of the closed cover, and the smoke exhaust port is connected to the secondary dust removal pipeline of the converter.

[0016] The smoke exhaust port arranged at the rear end of the smoke exhaust hood can assist in smoke exhaust. When the amount of secondary smoke in the dust collecting space within the closed hood is large, the smoke exhaust port can be opened for auxiliary smoke exhaust. The secondary smoke in the dust collecting space that has undergone heat exchange can enter the secondary dust removal duct of the converter through the smoke exhaust hood and can also enter the secondary dust removal duct of the converter through the smoke exhaust port.

[0017] In a preferred embodiment of the present invention, a first temperature measuring instrument is provided in the secondary dust removal pipe of the converter, a regulating valve is provided on the inlet pipe or outlet pipe connected to the heat exchanger and through which the second heat exchange medium flows, and a flow meter is also provided on the inlet pipe or outlet pipe connected to the heat exchanger and through which the second heat exchange medium flows.

[0018] The first thermometer can monitor the temperature of the secondary flue gas in the secondary dust removal pipeline of the converter, the regulating valve can adjust the flow of the second heat exchange medium in the heat exchanger, and the flow meter can monitor the flow of the second heat exchange medium in the heat exchanger in real time.

[0019] In a preferred embodiment of the present invention, a second temperature measuring instrument is provided on the inlet pipe, and a third temperature measuring instrument is provided on the outlet pipe.

[0020] The second temperature measuring instrument and the third temperature measuring instrument can respectively monitor in real time the temperature of the second heat exchange medium before entering the heat exchanger and the temperature of the second heat exchange medium after flowing out of the heat exchanger.

[0021] In a preferred embodiment of the present invention, the energy-saving device of the converter flue gas dust removal system also includes a control unit, which is electrically connected to the first thermometer, the regulating valve and the flow meter. When the secondary flue gas temperature monitored by the first thermometer is higher than the first threshold value, the control unit controls the opening of the regulating valve to increase the flow rate of the second heat exchange medium in the heat exchanger.

[0022] The temperature of the secondary flue gas in the secondary dust removal pipeline of the converter is taken as the main control parameter, and the flow rate of the second heat exchange medium in the heat exchanger is adjusted in real time according to the temperature of the secondary flue gas; when the temperature of the flue gas in the secondary dust removal pipeline of the converter is high, it means that the amount of secondary flue gas generated by the converter is large, the efficiency of recovering the waste heat of the secondary flue gas is low and the recovery effect is poor. At this time, the opening of the regulating valve is increased through the control unit, and the flow rate of the second heat exchange medium in the heat exchanger is increased to increase the recovery of the waste heat of the secondary flue gas.

[0023] In a preferred embodiment of the present invention, the control unit is electrically connected to the second thermometer and the third thermometer. When the difference between the medium temperature monitored by the third thermometer and the medium temperature detected by the second thermometer is greater than a second threshold value, the control unit controls the opening of the regulating valve to increase the flow rate of the second heat exchange medium in the heat exchanger.

[0024] The temperature difference of the second heat exchange medium before and after the heat exchanger is used as an auxiliary control parameter, and the flow rate of the second heat exchange medium in the heat exchanger is adjusted in real time according to the size of the temperature difference before and after the heat exchange of the second heat exchange medium; when the temperature difference before and after the second heat exchange medium is large, it means that the amount of secondary flue gas generated by the converter is large, the efficiency of recovering the waste heat of the secondary flue gas is low and the recovery effect is poor. At this time, the opening of the regulating valve is increased by the control unit, and the flow rate of the second heat exchange medium in the heat exchanger is increased to increase the recovery amount of the waste heat of the secondary flue gas, avoid a large waste of waste heat in the secondary flue gas, ensure the decrease of the secondary flue gas temperature, and thereby reduce the workload of the dust removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0027] Figure 1 It is a front view structural schematic diagram of the energy-saving device of the converter flue gas dust removal system of the utility model;

[0028] Figure 2 It is a top view structural schematic diagram of the energy-saving device of the converter flue gas dust removal system of the utility model;

[0029] Figure 3 It is a side structural schematic diagram of the energy-saving device of the converter flue gas dust removal system described in the utility model.

[0030] Description of Figure Numbers:

[0031] 10. Converter;

[0032] 20. Heat pipe; 21. Low temperature heat exchange end; 22. High temperature heat exchange end;

[0033] 30. Heat exchanger; 31. Inlet pipe; 32. Outlet pipe;

[0034] 40. Exhaust hood; 41. Converter secondary dust removal duct;

[0035] 50. Enclosed hood; 51. Dust collection space; 52. Fire door in front of furnace; 53. Fire door in back of furnace; 54. Smoke exhaust port;

[0036] 60. flow meter; 61. first thermometer; 62. second thermometer; 63. third thermometer;

[0037] 70. Control unit. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] like Figures 1 to 3 As shown, the utility model provides an energy-saving device for a converter flue gas dust removal system, which includes: a plurality of heat pipes 20, which are arranged around the outside of a converter 10, a first heat exchange medium circulates in the heat pipes 20, and a low-temperature heat exchange end 21 of the heat pipe 20 is arranged near the outlet of the converter 10; a heat exchanger 30, which is arranged at a high-temperature heat exchange end 22 of the heat pipe 20, and a second heat exchange medium that can exchange heat with the first heat exchange medium flows in the heat exchanger 30.

[0042] The energy-saving device of the converter flue gas dust removal system described in the utility model recovers the heat of the secondary flue gas through a plurality of heat pipes 20 arranged around the outside of the converter 10 outlet. The secondary flue gas generated at the converter 10 outlet can directly exchange heat and cool down with the first heat exchange medium in the heat pipes 20. By lowering the temperature of the secondary flue gas, after the secondary flue gas is cooled, the volume flow rate is reduced, the flue gas flow velocity in the flue is reduced, the flue gas resistance is reduced, and at the same time, the flow rate passing through the fan is reduced, and the operating power consumption is slightly reduced, thereby reducing the operating load of the converter flue gas dust removal system. For existing dust removal equipment, it is beneficial to tap the potential of the equipment and improve the secondary dust removal effect of the converter 10.

[0043] Specifically, Figures 1 to 3As shown, the heat pipe 20 is extended in the vertical direction, and the upper and lower ends of two adjacent vertical pipes are connected by a bend pipe to form a relatively closed circulation loop. Each heat pipe 20 is provided with a first heat exchange medium that can exchange heat through phase change and can circulate; wherein the first heat exchange medium arranged in the heat pipe 20 can be converted between gas phase and liquid phase, thereby realizing circulation in the heat pipe 20.

[0044] Further, such as Figure 2 As shown, a plurality of heat pipes 20 are closely arranged on the left side, the right side and the rear side of the converter 10 . Since the converter 10 needs to be tilted forward during operation, no heat pipes 20 are provided on the front side of the converter 10 .

[0045] The lower end of the heat pipe 20 is used as the low-temperature heat exchange end 21, which is relatively close to the outlet of the converter 10; the upper end of the heat pipe 20 is used as the high-temperature heat exchange end 22, which is relatively far from the outlet of the converter 10, and a heat exchanger 30 is provided at the high-temperature heat exchange end 22. At the low-temperature heat exchange end 21, the first heat exchange medium in the liquid phase in the heat pipe 20 can exchange heat with the secondary flue gas escaping from the outlet of the converter 10 to increase the temperature. After the temperature is increased, the first heat exchange medium is converted from the liquid phase to the gas phase and then flows upward (that is, flows toward the high-temperature heat exchange end 22). The first heat exchange medium in the gas phase exchanges heat with the second heat exchange medium flowing in the heat exchanger 30 at the high-temperature heat exchange end 22 to reduce the temperature. The first heat exchange medium after the temperature is reduced is converted from the gas phase to the liquid phase again. After the temperature is reduced, the first heat exchange medium in the liquid phase flows to the low-temperature heat exchange end 21 again to exchange heat with the secondary flue gas. In this way, the secondary flue gas waste heat is recovered by repeating the cycle, thereby reducing its temperature. The high-temperature second heat exchange medium generated by heat exchange in the heat exchanger 30 can be reused, wherein the second heat exchange medium can be a heat exchange material commonly used in the prior art, such as molten salt or heat exchange oil.

[0046] In the energy-saving device of the converter flue gas dust removal system described in the utility model, the arrangement of the heat pipe 20 and the heat exchanger 30 can recover the remaining heat of the secondary flue gas as soon as it escapes, thereby reducing its temperature and enabling subsequent collection and processing at a lower temperature, thereby reducing the operating load of the converter flue gas dust removal system, reducing the corrosion of the entire equipment by the high-temperature flue gas, and thereby extending the service life of the equipment.

[0047] According to one embodiment of the present utility model, Figures 1 to 3 As shown, a closed cover 50 is provided on the outside of the converter 10 , and a relatively closed dust collecting space 51 is formed inside the closed cover 50 . The low-temperature heat exchange end 21 of the heat pipe 20 is located in the dust collecting space 51 , and the high-temperature heat exchange end 22 of the heat pipe 20 is located on the outside of the closed cover 50 .

[0048] A closed cover 50 is provided to seal the space outside the converter 10 to form a relatively closed dust collecting space 51. On the one hand, it can ensure that the flue gas can fully exchange heat with the heat pipe 20 in the dust collecting space 51. On the other hand, it can also ensure that the flue gas after heat exchange can be collected and discharged through the pipeline to avoid the escape of the flue gas.

[0049] Specifically, Figure 1 and Figure 2 As shown, the enclosed cover 50 is a relatively closed cubic structure, the converter 10 is located in the enclosed cover 50, the heat pipe 20 passes through the top wall of the enclosed cover 50 in the vertical direction, and the low-temperature heat exchange end 21 of the heat pipe 20 is located inside the enclosed cover 50. This part is directly fixed on the left side wall, the right side wall and the rear side wall of the enclosed cover 50, that is, the heat pipe 20 is set at a position close to the inner wall of the enclosed cover 50, so that the heat pipe 20 does not affect the tilting and rotation of the converter 10.

[0050] According to one embodiment of the present utility model, Figures 1 to 3 As shown, a smoke exhaust hood 40 is provided at the front end of the closed cover 50, and the smoke exhaust hood 40 is connected to a converter secondary dust removal duct 41. The smoke exhaust hood 40 and the converter secondary dust removal duct 41 connected to the smoke exhaust hood 40 can collect the secondary flue gas after heat exchange, so as to prevent the secondary flue gas from being directly discharged into the atmosphere and causing pollution.

[0051] Specifically, the smoke exhaust hood 40 is a door-shaped structure, which is arranged at the top of the front end of the closed hood 50, that is, the smoke exhaust hood 40 and the heat pipes 20 on the other three sides of the converter 10 are arranged around the converter 10. A smoke collecting chamber facing the outlet of the converter 10 is formed inside the smoke exhaust hood 40, and the two ends of the smoke exhaust hood 40 are respectively connected to the converter secondary dust removal pipe 41 connected to the smoke collecting chamber. The two ends of the smoke exhaust hood 40 pass through the left and right walls of the closed hood 50 and are connected to the converter secondary dust removal pipe 41. After the secondary smoke escaping from the outlet of the converter 10 completes the heat exchange with the heat pipe 20, it can enter the smoke collecting chamber and flow into the converter secondary dust removal pipe 41.

[0052] According to one embodiment of the present utility model, Figure 2 As shown, a front end of the enclosed cover 50 and a rear end of the enclosed cover 50 are respectively provided with a front fire-blocking door 52 and a rear fire-blocking door 53.

[0053] The front fire-blocking door 52 of the furnace is arranged on the front side wall of the enclosed cover 50, and the rear fire-blocking door 53 of the furnace is arranged on the rear side wall of the enclosed cover 50; the front fire-blocking door 52 of the furnace and the rear fire-blocking door 53 of the furnace can be opened when the converter 10 rotates, providing necessary avoidance space for the rotation of the converter 10, so that the converter 10 will not interfere with the front side wall and the rear side wall of the enclosed cover 50 during the rotation process.

[0054] According to one embodiment of the present utility model, Figure 2 and Figure 3 As shown, a smoke exhaust port 54 is provided at the rear end of the closed cover 50 , and the smoke exhaust port 54 is connected to the converter secondary dust removal duct 41 .

[0055] The smoke exhaust port 54 is opened on the rear side of the enclosed hood 50. The smoke exhaust port 54 can assist in smoke exhaust. When the amount of smoke in the dust collecting space 51 in the enclosed hood 50 is large, the smoke exhaust port 54 can be opened for auxiliary smoke exhaust. The smoke that has undergone heat exchange in the dust collecting space 51 can enter the converter secondary dust removal duct 41 through the smoke exhaust hood 40 and can also enter the converter secondary dust removal duct 41 through the smoke exhaust port 54.

[0056] According to one embodiment of the present utility model, Figure 1 As shown, a first temperature measuring instrument 61 is provided in the secondary dust removal pipe 41 of the converter, a regulating valve (not shown in the figure) is provided on the inlet pipe 31 or the outlet pipe 32 connected to the heat exchanger 30 and through which the second heat exchange medium flows, and a flow meter 60 is also provided on the inlet pipe 31 or the outlet pipe 32 connected to the heat exchanger 30 and through which the second heat exchange medium flows.

[0057] The first thermometer 61 can monitor the temperature of the flue gas in the converter secondary dust removal pipeline 41, the regulating valve can adjust the flow of the second heat exchange medium in the heat exchanger 30, and the flow meter 60 can monitor the flow of the second heat exchange medium in the heat exchanger 30 in real time.

[0058] Specifically, in the present embodiment, a first temperature measuring instrument 61 is provided in each of the two converter secondary dust removal pipes 41 connected at both ends of the exhaust hood 40; the second heat exchange medium inlet of the heat exchanger 30 is connected to the inlet pipe 31, and the second heat exchange medium outlet of the heat exchanger 30 is connected to the outlet pipe 32. The second heat exchange medium flows into the heat exchanger 30 through the inlet pipe 31 and exchanges heat with the first heat exchange medium in the heat pipe 20, and flows out from the outlet pipe 32 after being heated. A flow meter 60 and a regulating valve (not shown) are provided on the inlet pipe 31; in other embodiments of the present utility model, the flow rate of the second heat exchange medium can also be adjusted by controlling a driving device for driving the flow of the second heat exchange medium, thereby eliminating the need for setting the regulating valve.

[0059] According to one embodiment of the present utility model, Figure 1 As shown, a second temperature measuring instrument 62 is provided on the inlet pipe 31 connected to the heat exchanger 30 and through which the second heat exchange medium flows, and a third temperature measuring instrument 63 is provided on the outlet pipe 32 connected to the heat exchanger 30 and through which the second heat exchange medium flows.

[0060] The second temperature measuring instrument 62 and the third temperature measuring instrument 63 can respectively monitor in real time the temperature of the second heat exchange medium before entering the heat exchanger 30 and the temperature of the second heat exchange medium after flowing out of the heat exchanger 30 .

[0061] According to one embodiment of the present utility model, Figure 1 As shown, the energy-saving device of the converter flue gas dust removal system also includes a control unit 70, which is electrically connected to the first thermometer 61, the regulating valve and the flow meter 60. When the flue gas temperature monitored by the first thermometer 61 is higher than the first threshold value, the control unit 70 controls the opening of the regulating valve to increase the flow of the second heat exchange medium in the heat exchanger 30.

[0062] The temperature of the flue gas in the secondary dust removal pipeline 41 of the converter is used as the main control parameter, and the flow rate of the second heat exchange medium in the heat exchanger 30 is adjusted in real time according to the flue gas temperature; when the temperature of the flue gas in the secondary dust removal pipeline 41 of the converter is high, it means that the amount of flue gas generated by the converter 10 is large, the efficiency of recovering the waste heat of the secondary flue gas is low and the recovery effect is poor. At this time, the opening of the regulating valve is increased by the control unit 70, and the flow rate of the second heat exchange medium in the heat exchanger 30 is increased to increase the recovery amount of the waste heat of the secondary flue gas.

[0063] Specifically, the control unit 70 may be a PLC controller, which can receive the temperature signal and flow signal detected by the first thermometer 61 and the flow meter 60, and control the opening of the regulating valve according to the size of the temperature signal, thereby realizing the control of the flow of the second heat exchange medium in the heat exchanger 30. The first threshold value may be a temperature value pre-set in the control unit 70, and may be adjusted according to actual operating conditions.

[0064] In a preferred embodiment of the present invention, the control unit 70 is electrically connected to the second thermometer 62 and the third thermometer 63. When the difference between the medium temperature monitored by the third thermometer 63 and the medium temperature detected by the second thermometer 62 is greater than the second threshold value, the control unit 70 controls the opening of the regulating valve to increase the flow rate of the second heat exchange medium in the heat exchanger 30.

[0065] The temperature difference of the second heat exchange medium before and after the heat exchanger 30 is used as an auxiliary control parameter, and the flow rate of the second heat exchange medium in the heat exchanger 30 is adjusted in real time according to the size of the temperature difference before and after the heat exchange of the second heat exchange medium; when the temperature difference before and after the second heat exchange medium is large, it means that the amount of flue gas generated by the converter 10 is large, the efficiency of recovering the waste heat of the secondary flue gas is low and the recovery effect is poor. At this time, the opening of the regulating valve is increased by the control unit 70, and the flow rate of the second heat exchange medium in the heat exchanger 30 is increased to increase the recovery amount of the waste heat of the secondary flue gas, avoid a large waste of waste heat in the flue gas, ensure the decrease of the secondary flue gas temperature, and thereby reduce the workload of the converter flue gas dust removal system.

[0066] Specifically, the control unit 70 can receive the temperature signals detected by the second temperature measuring instrument and the third temperature measuring instrument and calculate the difference between the two, and control the opening of the regulating valve according to the size of the temperature difference, thereby realizing the control of the flow rate of the second heat exchange medium in the heat exchanger 30. The second threshold value can be a temperature difference value pre-set in the control unit 70, and can be adjusted according to the actual operating conditions.

[0067] The temperature of the flue gas in the converter secondary dust removal duct 41 and the temperature difference of the second heat exchange medium are set to perform dual control on the flow rate of the second heat exchange medium, so as to recover the waste heat in the secondary flue gas to the maximum extent on the basis of ensuring the stable operation of the system, so that the temperature of the secondary flue gas can be greatly reduced, thereby reducing the operating load of the converter dust removal system.

[0068] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. An energy-saving device for a converter flue gas dust removal system, characterized in that: include: A plurality of heat pipes are arranged around the outside of the converter, a first heat exchange medium circulates in the heat pipes, and a low-temperature heat exchange end of the heat pipe is arranged close to the outlet of the converter; The heat exchanger is arranged at the high-temperature heat exchange end of the heat pipe, and the second heat exchange medium capable of exchanging heat with the first heat exchange medium flows through the heat exchanger.

2. The energy-saving device for converter flue gas dust removal system according to claim 1, characterized in that: A closed cover is provided on the outside of the converter, a relatively closed dust collecting space is formed in the closed cover, the low temperature heat exchange end of the heat pipe is located in the dust collecting space, and the high temperature heat exchange end of the heat pipe is located on the outside of the closed cover.

3. The energy-saving device for converter flue gas dust removal system according to claim 2 is characterized in that: A smoke exhaust hood is provided at the front end of the enclosed hood, and the smoke exhaust hood is connected to a converter secondary dust removal pipeline, and the converter secondary dust removal pipeline is located outside the enclosed hood.

4. The energy-saving device for converter flue gas dust removal system according to claim 3 is characterized in that: The smoke exhaust hood is a door-shaped structure, and the smoke exhaust hood is arranged close to the front end of the closed hood.

5. The energy-saving device for converter flue gas dust removal system according to claim 3 is characterized in that: The front end of the enclosed cover and the rear end of the enclosed cover are respectively provided with a furnace front fire-blocking door and a furnace rear fire-blocking door.

6. The energy-saving device for converter flue gas dust removal system according to claim 3 or 5, characterized in that: A smoke exhaust port is provided at the rear end of the closed cover, and the smoke exhaust port is connected to the secondary dust removal pipeline of the converter.

7. The energy-saving device for converter flue gas dust removal system according to claim 3, characterized in that: A first temperature measuring instrument is provided in the secondary dust removal pipeline of the converter, a regulating valve is provided on the inlet pipeline or outlet pipeline connected to the heat exchanger and through which the second heat exchange medium flows, and a flow meter is also provided on the inlet pipeline or outlet pipeline connected to the heat exchanger and through which the second heat exchange medium flows.

8. The energy-saving device for converter flue gas dust removal system according to claim 7, characterized in that: The inlet pipe is provided with a second temperature measuring instrument, and the outlet pipe is provided with a third temperature measuring instrument.

9. The energy-saving device for converter flue gas dust removal system according to claim 8, characterized in that: It also includes a control unit, which is electrically connected to the first thermometer, the regulating valve and the flow meter. When the flue gas temperature monitored by the first thermometer is higher than a first threshold value, the control unit controls the opening of the regulating valve to increase the flow of the second heat exchange medium in the heat exchanger.

10. The energy-saving device for converter flue gas dust removal system according to claim 9, characterized in that: The control unit is electrically connected to the second thermometer and the third thermometer. When the difference between the medium temperature monitored by the third thermometer and the medium temperature detected by the second thermometer is greater than a second threshold, the control unit controls the opening of the regulating valve to increase the flow rate of the second heat exchange medium in the heat exchanger.

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