Aluminum heating furnace waste heat recycling equipment

Abstract

The present invention belongs to the field of aluminum processing technology, and in particular, relates to a waste heat recycling device for an aluminum heating furnace, including a hot water generation system, a first and a second hot water generation subsystem connected in series, and generating the first and second hot water respectively, the temperature of the first hot water is lower than the temperature of the second hot water, and the second hot water is saturated water; a steam generation system, the second hot water is heated up in the evaporator after heat exchange with the exhaust flue gas from the heating furnace to form saturated steam and enter the finishing workshop; a hot air generation system, a hood is arranged outside the exhaust pipe of the first hot water generation subsystem, and the hot air is heated up after heat exchange to form hot air and enter the top of the heating furnace through the fan; a control system is linked and connected with the hot water, steam and hot air generation systems, and under its control, the hot air temperature is negatively correlated with the steam volume. The present invention has the advantages of being able to produce steam, hot water and hot air, comprehensively utilizing the exhaust flue gas of the heating furnace, and having high steam output and quality, and considerable economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum processing, and in particular relates to a waste heat recycling device for an aluminum heating furnace. Background Art

[0002] Before rolling, aluminum ingots need to be heated and evenly heated in a heating furnace. Take a pusher heating furnace as an example. It has a burner inside. Natural gas is introduced into the burner and mixed with air for combustion. The heat generated by the combustion is used to meet the needs of rolling aluminum ingots. The internal temperature of some heating furnaces can reach 500 to 600 degrees Celsius. Therefore, even after heating the aluminum ingots, the exhaust gas still has a high temperature and retains a lot of heat. Therefore, in some aluminum ingot production systems, waste heat recycling equipment is installed after the heating furnace.

[0003] A more common waste heat recycling device for a heating furnace is a boiler structure, which passes the exhaust gas from the heating furnace into a waste heat boiler, heats the water in the boiler into steam, and uses the exhaust gas from the heating furnace to generate steam, thereby providing steam for other links in the production and realizing the recycling of the waste heat from the heating furnace.

[0004] However, the actual steam output of existing waste heat boilers is very small, and the steam pressure and temperature are also low. Some steam even contains water, and the actual utilization rate is low. Therefore, how to reliably and effectively reuse the waste heat of the heating furnace in aluminum processing has become a problem that needs to be solved. Summary of the invention

[0005] The invention provides an aluminum heating furnace waste heat recycling device, which can produce steam, hot water and hot air, and can comprehensively utilize the exhaust flue gas of the heating furnace. The output and quality of the produced steam are improved, and the economic benefits are considerable.

[0006] The technical solution of the present invention includes: an aluminum heating furnace waste heat recycling device, comprising:

[0007] A hot water generation system, the hot water generation system comprising a water supply pipeline and a first hot water supply pipeline and a second hot water supply pipeline, the first hot water in the first hot water supply pipeline is generated by a first hot water generation subsystem, the second hot water in the second hot water supply pipeline is generated by a second hot water generation subsystem, the first hot water generation subsystem and the second hot water generation subsystem are connected in series, the temperature of the first hot water is lower than the temperature of the second hot water, and the second hot water is saturated water;

[0008] A steam generation system, the steam generation system comprising an evaporator and a steam supply pipeline, part of the second hot water enters the evaporator through a steam drum, the second hot water is heated to form saturated steam after heat exchange with exhaust flue gas from a heating furnace in the evaporator, and the saturated steam enters the finishing workshop through a steam supply pipeline;

[0009] A hot air generating system, the hot air generating system comprising an air supply pipeline and an air hood, the air hood being arranged outside the exhaust pipe of the first hot water generating subsystem, the cold air in the air hood exchanging heat with the exhaust smoke in the exhaust pipe and then heating up to form hot air, the hot air passes through the air supply pipeline and the fan and enters the top of the heating furnace;

[0010] A control system, the control system includes a controller, the controller is linked to a hot water generating system, a steam generating system and a hot air generating system, and under the control of the controller, the hot air temperature of the hot air generating system is negatively correlated with the steam volume of the steam generating system.

[0011] Preferably, the first hot water generating subsystem includes a condenser, and the cold water in the water supply pipeline is heated to 60-70°C in the condenser after heat exchange with the exhaust flue gas from the second hot water generating subsystem to form the first hot water. Part of the first hot water enters the first hot water supply pipeline, and the other part of the first hot water enters the second hot water generating subsystem.

[0012] Preferably, the second hot water generating subsystem includes a deaerator and an economizer, and the first hot water from the first hot water generating subsystem successively enters the deaerator and the economizer, and the deoxygenated first hot water is heated to 100-104°C after heat exchange with the exhaust flue gas from the steam generating system in the economizer to form saturated second hot water, part of the second hot water enters the second hot water supply pipeline, and the other part of the second hot water enters the steam generating system.

[0013] Preferably, the first hot water supply pipeline is connected to the bathing room, and the second hot water supply pipeline is connected to the lotion room.

[0014] Preferably, the heating furnace is connected to a heat exchanger, and the heat exchanger is connected to a controller, and the controller adjusts the degree of heating of the hot air by the heat exchanger according to the steam demand of the finishing workshop.

[0015] Preferably, when the steam demand of the finishing workshop is zero, the hot air is heated to 90°C.

[0016] Preferably, the smoke exhaust duct of the hot air generating system is connected to a chimney, and the diameter of the chimney is 1m.

[0017] The beneficial effects of the present invention are as follows: by designing a hot water generation system, a steam generation system and a hot air generation system, and designing a first hot water generation subsystem and a second hot water generation subsystem in the hot water generation system, hot water of different temperature sections is formed, and the hot water of the high temperature section is generated into saturated water, thereby providing a basis for generating saturated steam, and the exhaust flue gas after being used in the hot water generation system is reused, and the cold air is heated by designing a wind hood so that the hot air entering the heating furnace has a certain amount of preheating in advance, and further, a control system is designed to control the above hot water, steam and hot air generation systems in linkage, so that the temperature of the hot air can be increased when the demand for steam is small. In this way, the waste heat recycling equipment of this scheme can produce steam, hot water and hot air at the same time, and the steam quality provided is saturated steam with good quality and output, and the exhaust waste heat of the aluminum heating furnace can be fully and reliably utilized, with considerable economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0019] Figure 1 is a schematic diagram of an embodiment.

[0020] in:

[0021] 1. Heating furnace, 11. Smoke exhaust pipeline, 2. Controller, 3. Air supply pipeline, 31. Wind hood, 32. Fan, 33. Heat exchanger, 4. Water supply pipeline, 41. First hot water supply pipeline, 42. Second hot water supply pipeline, 43. Water tank, 44. Condenser, 45. Deaerator, 46. Economizer, 5. Chimney, 6. Steam supply pipeline, 61. Evaporator, 62. Steam drum. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] In this article, the terms "upper, lower, left, right, inside, outside" and the like are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components. In addition, in the embodiments of the present invention, "above", "below", etc. include the number itself.

[0024] like Figure 1 As shown, this embodiment discloses an aluminum heating furnace waste heat recycling device, including: a hot water generating system, the hot water generating system includes a water supply pipeline 4 and a first hot water supply pipeline 41 and a second hot water supply pipeline 42, wherein the first hot water in the first hot water supply pipeline 41 is formed by a first hot water generating subsystem, and the second hot water in the second hot water supply pipeline 42 is formed by a second hot water generating subsystem, the above first hot water generating subsystem and the second hot water generating subsystem are connected in series, and the temperature of the first hot water is lower than the temperature of the second hot water, wherein the second hot water is saturated water.

[0025] In the hot water generating system, if the cold water passes through the path in sequence, the cold water first enters the first hot water generating subsystem through the water supply pipe 4, and then is initially heated up in the first hot water generating subsystem to form the first hot water, and then enters the second hot water generating subsystem, and is heated up again in the second hot water generating subsystem to form the second hot water. In this way, the temperature of the second hot water is higher than that of the first hot water, and considering the need to generate saturated steam, the second hot water is processed into saturated hot water in the second hot water generating subsystem.

[0026] Similarly, in the hot water generating system, if the exhaust flue gas passes through the path in sequence, the flue gas exhausted from the heating furnace 1 first enters the second hot water generating subsystem to perform heat exchange and temperature increase on the first hot water entering therein, and then enters the first hot water generating subsystem to perform initial heat exchange and temperature increase on the cold water entering therein.

[0027] The steam generation system includes an evaporator 61 and a steam supply pipeline 6. Part of the second hot water enters the evaporator 61 through the steam drum 62. The second hot water is heated to form saturated steam after heat exchange with the exhaust gas from the heating furnace 1 in the evaporator 61. The saturated steam enters the finishing workshop through the steam supply pipeline 6. In the steam generation system, the exhaust gas comes directly from the heating furnace 1, so the exhaust gas has a higher temperature, which is conducive to heating the saturated water into saturated steam. And the saturated steam formed here can be provided to the finishing workshop for use. For example, the saturated steam generated is 0.5-0.8Mpa, and can reach 0.8t / h, which is not only of high quality but also of large output.

[0028] A hot air generating system includes an air supply pipeline 3 and an air hood 31, wherein the air hood 31 is arranged on the outside of the smoke exhaust pipeline of the first hot water generating subsystem, and the cold air in the air hood 31 is heated up by heat exchange with the exhaust smoke in the smoke exhaust pipeline to form hot air, and the hot air enters the top of the heating furnace 1 through the air supply pipeline 3 and the fan 32 to preheat the air used by the heating furnace 1, so as to maximize the utilization of the waste heat of the exhaust smoke.

[0029] The control system includes a controller 2, which is linked to the hot water generation system, the steam generation system and the hot air generation system, that is, when the controller 2 controls the hot water, steam and hot air generation systems, it comprehensively considers the relationship between the three to achieve a better overall comprehensive effect. Under the control of the controller 2, the hot air temperature of the hot air generation system is negatively correlated with the steam volume of the steam generation system, that is, if the steam volume of the steam generation system is small, the hot air temperature of the hot air generation system can be increased.

[0030] Through the above hot water, steam and hot air generation system, the exhaust heat of the heating furnace can be fully and effectively utilized, and sufficient saturated steam can be produced, and the steam pressure meets the use requirements of the finishing workshop. In addition, the first and second hot water generation subsystems are designed in the hot water generation system. The series-connected segmented design can provide hot water of different temperature ranges to different demand areas, and the second hot water is processed into saturated water to provide a basis for the generation of saturated steam. In addition, the exhaust smoke after being used in the hot water generation system is further reused in the hot air generation system. The wind hood 31 is designed to be set on the outside of the exhaust pipe, and the heat exchange between the exhaust smoke and the cold air after the hot water is used is realized through indirect contact, thereby providing a certain preheating for the hot air used by the heating furnace 1, and the heating degree of the hot air is related to the steam volume of the steam generation system, so as to achieve a good reuse effect of the exhaust heat as a whole.

[0031] Specifically, the first hot water generating subsystem includes a condenser 44. The cold water in the water supply pipe 4 is heated to 60-70°C in the condenser 44 after heat exchange with the exhaust flue gas from the second hot water generating subsystem to form the first hot water. Part of the first hot water enters the first hot water supply pipe 41, and the other part of the first hot water enters the second hot water generating subsystem.

[0032] The second hot water generation subsystem includes a deaerator 45 and an economizer 46. The first hot water from the first hot water generation subsystem enters the deaerator 45 and the economizer 46 in sequence. The first hot water after deaeration is heated to 100-104°C in the economizer 46 with the exhaust flue gas from the steam generation system to form saturated second hot water. Part of the second hot water enters the second hot water supply pipeline 42, and the other part of the second hot water enters the steam generation system. Among them, the first hot water supply pipeline 41 is connected to the bathing room, and the second hot water supply pipeline 42 is connected to the emulsion room, so that the first hot water and the second hot water of different temperature sections are respectively supplied to the bathing room and the emulsion room.

[0033] The heating furnace 1 is connected to a heat exchanger 33, which is connected to a controller 2. The controller 2 adjusts the degree of heating of the hot air by the heat exchanger 33 according to the steam demand of the finishing workshop. Specifically, when the steam demand of the finishing workshop is zero, the hot air is heated to 90°C. The exhaust pipe of the hot air generation system is connected to a chimney 5, that is, after the exhaust smoke is successively heat-exchanged and utilized by the steam, hot water and hot air generation system, it is discharged through the chimney 5. The diameter of the chimney 5 is designed to be 1m to increase the flow rate of the final exhaust smoke.

[0034] The exhaust gas recycling equipment of the aluminum heating furnace of this embodiment can produce hot water (1.5t / h) at about 60°C for use in the bathing room, and water (1.5t / h) at about 104°C for use in the emulsion room; it can produce hot air (6400Nm3 / h) at about 75°C for use in the heating furnace body; it can produce saturated steam of 0.8t / h, about 610KW, 69KW on the hot water side and 133KW on the hot air side. Based on an annual output of 7000 hours, it can save about 5684MW of energy throughout the year, with obvious economic benefits.

[0035] In the case where the embodiments are not contradictory, at least part of the technical solutions in the embodiments can be recombined to form the substantial technical solution of the present invention, and the embodiments can also reference or include each other.

[0036] The technical principle of the present invention is described above in combination with specific embodiments, but it should be noted that the above descriptions are only for explaining the principle of the present invention and cannot be interpreted as a specific limitation on the protection scope of the present invention in any way. Based on the explanation here, technicians in this field can think of other specific embodiments or equivalent replacements of the present invention without paying creative work, which will fall within the protection scope of the present invention.

Claims

1. A waste heat recycling device for an aluminum heating furnace, characterized in that: include: A hot water generation system, the hot water generation system comprising a water supply pipeline (4) and a first hot water supply pipeline (41) and a second hot water supply pipeline (42), the first hot water in the first hot water supply pipeline (41) being generated by a first hot water generation subsystem, the second hot water in the second hot water supply pipeline (42) being generated by a second hot water generation subsystem, the first hot water generation subsystem and the second hot water generation subsystem being connected in series, the temperature of the first hot water being lower than the temperature of the second hot water, and the second hot water being saturated water; A steam generation system, the steam generation system comprising an evaporator (61) and a steam supply pipeline (6), part of the second hot water enters the evaporator (61) through a steam drum (62), the second hot water is heated in the evaporator (61) after heat exchange with exhaust flue gas from a heating furnace (1) to form saturated steam, and the saturated steam enters a finishing workshop through the steam supply pipeline (6); A hot air generating system, the hot air generating system comprising an air supply pipeline (3) and an air hood (31), the air hood (31) being arranged outside the smoke exhaust pipeline of the first hot water generating subsystem, the cold air in the air hood (31) exchanging heat with the exhaust smoke in the smoke exhaust pipeline and then heating up to form hot air, the hot air passing through the air supply pipeline (3) and the fan (32) entering the top of the heating furnace (1); A control system, the control system comprising a controller (2), the controller (2) being linked to a hot water generation system, a steam generation system and a hot air generation system, wherein under the control of the controller (2), the hot air temperature of the hot air generation system is negatively correlated with the steam volume of the steam generation system; The first hot water generation subsystem comprises a condenser (44), the cold water in the water supply pipeline (4) is heated to 60-70° C. in the condenser (44) after heat exchange with exhaust flue gas from the second hot water generation subsystem to form first hot water, part of the first hot water enters the first hot water supply pipeline (41), and the other part of the first hot water enters the second hot water generation subsystem; The second hot water generation subsystem comprises a deaerator (45) and an economizer (46), the first hot water from the first hot water generation subsystem enters the deaerator (45) and the economizer (46) in sequence, the first hot water after deaeration exchanges heat with exhaust flue gas from the steam generation system in the economizer (46) and is heated to 100 to 104° C. to form saturated second hot water, part of the second hot water enters the second hot water supply pipeline (42), and the other part of the second hot water enters the steam generation system; The heating furnace (1) is connected to a heat exchanger (33), and the heat exchanger (33) is connected to a controller (2). The controller (2) adjusts the degree of heating of the hot air by the heat exchanger (33) according to the steam demand of the finishing workshop.

2. The aluminum heating furnace waste heat recycling equipment according to claim 1, characterized in that: The first hot water supply pipeline (41) is connected to the bathing room, and the second hot water supply pipeline (42) is connected to the lotion room.

3. The aluminum heating furnace waste heat recycling equipment according to claim 1, characterized in that: When the steam demand of the finishing workshop is zero, the hot air is heated to 90°C.

4. The aluminum heating furnace waste heat recycling equipment according to claim 1, characterized in that: The smoke exhaust duct of the hot air generating system is connected to a chimney (5), and the diameter of the chimney (5) is 1 m.

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