Cyclic heating device of hot blast stove and using method of cyclic heating device

Abstract

The hot-blast stove cyclic heating device comprises an acidification roasting kiln and a hot-blast stove used in cooperation with the acidification roasting kiln, a hot air outlet of the hot-blast stove is communicated with a heat exchange inlet of the acidification roasting kiln through a pipeline, and one end of a combustion nozzle of the hot-blast stove is communicated with a natural gas inlet pipe; and a hot air inlet of the hot air furnace communicates with an air outlet of the air-air heat exchange assembly through a pipeline. According to the hot-blast stove cyclic heating device and the using method thereof, the medium-temperature flue gas subjected to heat exchange with the acidification roasting kiln is circularly conveyed into the hot-blast stove to be mixed with air, so that cyclic utilization of medium-temperature gas is achieved, and part of the medium-temperature gas is used for heat exchange of air conveyed into the hot-blast stove through the air-air heat exchange assembly; while the temperature of the discharged flue gas is reduced, reliable guarantee is provided for rapid and uniform temperature rise of the acidification roasting kiln, and efficient utilization of the temperature of the discharged flue gas is realized.

Description

Technical Field

[0001] The invention relates to the technical field of hot blast stoves, and in particular to a hot blast stove circulation heating device and a use method thereof. Background Art

[0002] In industrial production, raw materials need to undergo a series of physical property changes, or undergo certain chemical reactions with a certain medium, and finally obtain the required industrial products. In the production process, pressurization, heating or the use of catalysts are generally used to meet the technical requirements of process production, or to speed up the output rate, and finally achieve industrial production. Among them, according to the heating method and heating medium, it can be divided into many types: for example, according to different heating media, it can be divided into: steam heating, air heating, molten salt heating, electric heating, etc.; according to the heat exchange method, it can be divided into: direct combustion heating, contact heating, wall heat exchange, etc. In the industrial production process, according to different process requirements, different media, heat exchange requirements, etc., select the heat exchange process and equipment that meet the requirements. In today's environmental protection denitrification section heating, lithium salt extraction acidification roasting kiln, rare earth industry roasting kiln, etc., hot air furnace heating process is often used. The following points are required in the selection of heating process and equipment: First, it can meet the process production temperature index requirements, heating time, heating rate and uniform and stable heating. Second, it is energy-saving and environmentally friendly, with high heat utilization rate and no three waste pollution. Third, the process and equipment are highly stable, safe and reliable. Fourth, the operating cost is low and the maintenance operation is convenient.

[0003] When the existing hot blast furnace heats the acidification roasting kiln, the high-temperature gas generated is directly discharged into the external environment, resulting in a large amount of heat energy waste. Therefore, a hot blast furnace circulation heating device and a use method thereof are proposed to utilize the temperature of the exhaust flue gas, reduce energy loss, and reduce the heat consumption of the hot blast furnace, thereby providing reliable guarantee for the rapid and uniform heating of the hot blast furnace. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a hot blast furnace circulation heating device and a method of using the same, which solves the problem that when the existing hot blast furnace heats the acidification roasting kiln, the high-temperature gas generated is directly discharged into the external environment, causing a large amount of heat energy waste.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: On the one hand, a hot blast furnace circulation heating device comprises an acidification roasting kiln and a hot blast furnace used in conjunction with the acidification roasting kiln, wherein the hot gas outlet of the hot blast furnace is connected to the heat exchange inlet of the acidification roasting kiln through a pipeline, one end of the combustion nozzle of the hot blast furnace is connected to a natural gas inlet pipe, the hot air inlet of the hot blast furnace is connected to the air outlet of an air-to-air heat exchange component through a pipeline, the heat exchange outlet of the acidification roasting kiln is connected to a high-temperature circulation component, and the output end of the high-temperature circulation component is respectively connected to the flue gas inlet of the air-to-air heat exchange component and the circulating air inlet of the hot blast furnace through a three-way valve.

[0006] The present invention is further configured as follows: a first regulating valve is arranged between the three-way valve and the circulating air inlet of the hot blast furnace, a second regulating valve is arranged between the three-way valve and the hot air inlet of the air-to-air heat exchange component, and a third regulating valve is arranged on the surface of the natural gas inlet pipe.

[0007] The present invention is further configured as follows: the air inlet of the air-to-air heat exchange component is connected to the outlet of the air fan through a pipeline, and the smoke outlet of the air-to-air heat exchange component is connected to the inlet of the smoke exhaust fan through a pipeline.

[0008] The present invention is further configured as follows: the high temperature circulation component comprises a water removal component and a high temperature circulation fan, and the air outlet end of the water removal component is connected to the air inlet of the high temperature circulation fan through a pipeline; The air inlet of the dehydration component is connected to the heat exchange outlet of the acidification roasting kiln through a pipeline, and the air outlet of the high-temperature circulation fan is connected to the hot air inlet of the air-to-air heat exchange component and the circulating air inlet of the hot air furnace through a three-way valve.

[0009] The present invention is further configured as follows: the dewatering assembly includes a dewatering box, the bottom of the dewatering box penetrates and is slidably mounted with two first dewatering racks and two second dewatering racks, the bottoms of the two first dewatering racks and the two second dewatering racks are fixedly mounted with blocking plates, the fronts of the two first dewatering racks and the two second dewatering racks are provided with assembly grooves, the interior of the assembly grooves is slidably mounted with a steam absorbing molecular sieve, both sides of the two first dewatering racks and the two second dewatering racks are provided with air ports connected to the assembly grooves, and the two first dewatering racks are arranged between the two second dewatering racks; The tops of the first dewatering frame and the second dewatering frame on opposite sides are both rotatably mounted with sleeves, and the opposite ends of the two sleeves are penetrated by a guide rod, and the guide rod is rotatably mounted on the inner wall of the dewatering box through a pin shaft; An electric telescopic rod is fixedly installed at the bottom of the dewatering box, and a driving frame is fixedly installed at the telescopic end of the electric telescopic rod. The tops of both sides of the driving frame are respectively fixedly connected to the opposite sides of the bottom sealing plates of the two first dewatering frames.

[0010] The present invention is further configured as follows: sealing pads are fixedly installed on both sides of the two first water removal racks and the two second water removal racks and above the air outlets.

[0011] The present invention is further configured as follows: an air inlet flange and an air outlet flange are respectively connected on both sides of the water removal box, the air inlet flange is connected to the heat exchange outlet of the acidification roasting kiln through a pipeline, and the air outlet flange is connected to the air inlet of the high-temperature circulation fan through a pipeline.

[0012] On the other hand, the present invention also discloses a method for using a hot air furnace circulation heating device, which specifically comprises the following steps: Step 1: The air blower accelerates the air into the air-to-air heat exchange component and then into the hot blast furnace. The natural gas enters the combustion nozzle of the hot blast furnace through the natural gas inlet pipe, ignites the natural gas, and the generated high-temperature gas is accelerated and transported to the acidification roasting kiln; Step 2: The high-temperature gas enters the jacket of the acidification roasting kiln to increase the internal environmental temperature of the acidification roasting kiln. During the process, the high-temperature gas is cooled to medium-temperature gas; Step 3: The medium-temperature gas enters the water removal tank through the air inlet flange, and is screened out of the water vapor in the medium-temperature gas by a steam absorption molecular sieve through the air port, and then is screened out of the water vapor in the medium-temperature gas by another steam absorption molecular sieve through the air port; Part of the medium-temperature gas is transported to the air-to-air heat exchange component by the high-temperature circulation fan. After the medium-temperature gas exchanges heat with the air entering the air-to-air heat exchange component in the air-to-air heat exchange component, it is discharged quickly through the exhaust fan. The remaining medium-temperature gas is transported to the hot blast furnace by the high-temperature circulation fan for mixing with air.

[0013] The present invention provides a hot air furnace circulation heating device and a method for using the same. The device has the following beneficial effects: (1) The present invention realizes the recycling of medium-temperature gas by circulating the medium-temperature flue gas after heat exchange with the acidification roasting kiln to the hot blast furnace for mixing with air, and uses part of the medium-temperature gas to exchange heat with the air transported to the hot blast furnace through the air-to-air heat exchange component, thereby reducing the exhaust flue gas temperature and providing reliable guarantee for the rapid and uniform heating of the acidification roasting kiln, thereby realizing efficient utilization of the exhaust flue gas temperature.

[0014] (2) The present invention realizes dehumidification treatment of medium-temperature gas through the cooperation of a dehumidification component and a high-temperature circulation fan, thereby preventing water vapor generated by natural gas combustion from directly entering the high-temperature circulation fan and causing erosion damage thereto. In addition, through the cooperation of an electric telescopic rod, a first dehumidification frame, a second dehumidification frame, a sealing plate, an assembly groove, a steam absorption molecular sieve, an air port, a sleeve, a guide rod and a drive frame, the two steam absorption molecular sieves can work simultaneously, thereby providing a guarantee for the removal of moisture from the medium-temperature gas. In addition, through the alternating use of the first dehumidification frame and the second dehumidification frame, a convenient guarantee is provided for the replacement of the steam absorption molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure distribution of the present invention; Figure 2 It is a schematic diagram of the internal structure of the water removal component of the present invention; Figure 3 The present invention is a schematic structural diagram of the first dewatering frame, the blocking plate, the assembly groove, the steam absorption molecular sieve, the air port and the sealing pad.

[0016] In the figure: 1. Acidification roasting kiln; 2. Hot air furnace; 3. Natural gas inlet pipe; 4. Air-to-air heat exchange components; 5. High temperature circulation assembly; 501. Dehydration assembly; 5011. Dehydration box; 5012. First dehydration rack; 5013. Second dehydration rack; 5014. Blocking plate; 5015. Assembly slot; 5016. Steam absorption molecular sieve; 5017. Air outlet; 5018. Sleeve; 5019. Guide rod; 50110. Electric telescopic rod; 50111. Driving frame; 50112. Sealing pad; 50113. Inlet flange; 50114. Outlet flange; 502. High temperature circulation fan; 6. The first regulating valve 7. Second regulating valve; 8. The third regulating valve; 9. Air blower; 10. Smoke exhaust fan. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] See also Figure 1-3 , the embodiment of the present invention provides the following technical solutions: Embodiment 1: A hot blast furnace circulation heating device comprises an acidification roasting kiln 1 and a hot blast furnace 2 used in conjunction with the acidification roasting kiln 1, wherein the hot air outlet of the hot blast furnace 2 is connected to the heat exchange inlet of the acidification roasting kiln 1 through a pipeline, one end of the combustion nozzle of the hot blast furnace 2 is connected to a natural gas inlet pipe 3, and a third regulating valve 8 is arranged on the surface of the natural gas inlet pipe 3, and the hot air inlet of the hot blast furnace 2 is connected to the air outlet of an air-to-air heat exchange component 4 through a pipeline, wherein the air-to-air heat exchange component 4 is an air-to-air heat exchange device, such as after a spirally arranged heat exchange tube is passed through a box body, high-temperature gas passes through the heat exchange tube, and air inlets and outlets are directly opened on both sides of the box body, and in the process of outside air passing through the air inlet and outlet, heat is exchanged with the heat exchange tube, thereby reducing high The temperature of the high-temperature gas. In this embodiment, the high-temperature gas is the gas after one heat exchange. After exchanging heat with the air, that is, heating the air, it is directly discharged into the external environment. The heat exchange outlet of the acidification roasting kiln 1 is connected with a high-temperature circulation fan 502. The air outlet of the high-temperature circulation fan 502 is connected with the smoke inlet of the air-to-air heat exchange component 4 and the circulating air inlet of the hot blast furnace 2 through a three-way valve, respectively. A first regulating valve 6 is arranged between the three-way valve and the circulating air inlet of the hot blast furnace 2. A second regulating valve 7 is arranged between the three-way valve and the hot air inlet of the air-to-air heat exchange component 4. The air inlet of the air-to-air heat exchange component 4 is connected with the outlet of the air fan 9 through a pipeline, and the smoke outlet of the air-to-air heat exchange component 4 is connected with the inlet of the smoke exhaust fan 10 through a pipeline.

[0019] In this embodiment, a high-temperature circulating fan 502 is used to realize the circulation drive of the medium-temperature flue gas, part of which is used to preheat the air entering the hot blast furnace 2, and part of which is put into the hot blast furnace 2 as aeration, providing a guarantee for the rapid and uniform increase of temperature and effectively reducing heat energy loss.

[0020] Embodiment 2: This embodiment is an improvement of the previous embodiment. A hot blast furnace circulation heating device also includes a high-temperature circulation component 5. The high-temperature circulation component 5 includes a dehydration component 501 and a high-temperature circulation fan 502. The air outlet of the dehydration component 501 is connected to the air inlet of the high-temperature circulation fan 502 through a pipeline. The air inlet of the dehydration component 501 is connected to the heat exchange outlet of the acidification roasting kiln 1 through a pipeline. The air outlet of the high-temperature circulation fan 502 is connected to the hot air inlet of the air-to-air heat exchange component 4 and the circulation air inlet of the hot blast furnace 2 through a three-way valve. 501 includes a dewatering box 5011, and the two sides of the dewatering box 5011 are respectively connected with an air inlet flange 50113 and an air outlet flange 50114, the air inlet flange 50113 is connected to the heat exchange outlet of the acidification roasting kiln 1 through a pipeline, and the air outlet flange 50114 is connected to the air inlet of the high-temperature circulation fan 502 through a pipeline, and the bottom of the dewatering box 5011 is penetrated and slidably installed with two first dewatering racks 5012 and two second dewatering racks 5013, and the bottoms of the two first dewatering racks 5012 and the two second dewatering racks 5013 are fixedly installed with a blocking plate 5 014, the front sides of the two first dewatering racks 5012 and the two second dewatering racks 5013 are provided with assembly grooves 5015, and a steam absorbing molecular sieve 5016 is slidably installed inside the assembly grooves 5015. The two first dewatering racks 5012 and the two second dewatering racks 5013 are provided with air ports 5017 connected to the assembly grooves 5015 on both sides. The two first dewatering racks 5012 are arranged between the two second dewatering racks 5013. The tops of the first dewatering racks 5012 and the second dewatering racks 5013 on the opposite sides are both rotatably installed with sleeves 501 8. A guide rod 5019 passes through the opposite ends of the two sleeves 5018. The guide rod 5019 is rotatably installed on the inner wall of the water removal tank 5011 through a pin shaft. An electric telescopic rod 50110 is fixedly installed on the bottom of the water removal tank 5011. The electric telescopic rod 50110 is electrically connected to an external power supply and is controlled by a control switch. A driving frame 50111 is fixedly installed on the telescopic end of the electric telescopic rod 50110. The tops of both sides of the driving frame 50111 are respectively fixedly connected to the opposite sides of the bottom sealing plates 5014 of the two first water removal frames 5012.

[0021] Optionally, two groups of sleeves 5018 and guide rods 5019 arranged between a first water removal frame 5012 and a second water removal frame 5013 can be provided, one group including two sleeves 5018 and one guide rod 5019. At this time, the two guide rods 5019 are rotatably installed on the front and rear sides of the inner cavity of the water removal box 5011 through the equalizing pin shaft, which can further improve the stability of the lifting and lowering of the second water removal frame 5013.

[0022] As a detailed description, in order to improve the sealing effect of the water removal box 5011 , sealing pads 50112 are fixedly installed on both sides of the two first water removal frames 5012 and the two second water removal frames 5013 and above the air inlet 5017 .

[0023] The advantage of the second embodiment over the first embodiment is that the steam absorption molecular sieve 5016 can also be used to dehumidify the medium-temperature gas, and the steam absorption molecular sieve 5016 can be easily replaced after working for a set period of time.

[0024] The method for using the hot blast furnace circulation heating device specifically comprises the following steps: Step 1: The air blower 9 accelerates the air to enter the air-to-air heat exchange component 4, and then enters the hot blast furnace 2. The natural gas enters the combustion nozzle of the hot blast furnace 2 through the natural gas inlet pipe 3, ignites the natural gas, and the generated high-temperature gas is accelerated and transported to the acidification roasting kiln 1; Step 2: The high-temperature gas enters the jacket of the acidification roasting kiln 1 to increase the internal environment temperature of the acidification roasting kiln 1. During the process, the high-temperature gas is cooled to medium-temperature gas at 250°C-270°C. Step 3: The medium-temperature gas enters the water removal box 5011 through the air inlet flange 50113, and is screened out of the water vapor in the medium-temperature gas by a steam absorption molecular sieve 5016 through the air port 5017, and then is screened out of the water vapor in the medium-temperature gas by another steam absorption molecular sieve 5016 through the air port 5017; Part of the medium-temperature gas is transported to the air-to-air heat exchange component 4 by the high-temperature circulation fan 502. After the medium-temperature gas exchanges heat with the air entering the air-to-air heat exchange component 4 in the air-to-air heat exchange component 4, it is accelerated and discharged through the exhaust fan 10. The temperature of the exhaust gas is about 100°C. The remaining medium-temperature gas is transported to the hot blast furnace 2 by the high-temperature circulation fan 502 to be mixed with air, forming high-temperature hot air of 360° C.-400° C. to heat the acidification roasting kiln 1.

[0025] As a further explanation, after working for a certain period of time and needing to replace the steam absorption molecular sieve 5016, taking the steam absorption molecular sieve 5016 working in the dewatering tank 5011 being mounted on the second dewatering frame 5013 as an example, a new steam absorption molecular sieve 5016 is placed in the assembly groove 5015, the electric telescopic rod 50110 is controlled to contract, the electric telescopic rod 50110 drives the driving frame 50111 to rise, the driving frame 50111 drives the two blocking plates 5014 to make the two first dewatering frames 5012 rise, the first dewatering frame 5012 drives the new steam absorption molecular sieve 5016 to move into the dewatering tank 5011, during the process, the first dewatering frame 5012 Drive a sleeve 5018 to rise, and the sleeve 5018 lifts the guide rod 5019 to rotate, and makes the guide rod 5019 continuously immersed in the sleeve 5018, and one end of the guide rod 5019 drives the other sleeve 5018 to descend, and the other sleeve 5018 drives the second water removal frame 5013 to descend. After the guide rod 5019 is in a horizontal state, as the first water removal frame 5012 continues to rise, the guide rod 5019 continuously separates from the sleeve 5018 until the top of the first water removal frame 5012 contacts the top of the inner cavity of the water removal box 5011. At this time, the second water removal frame 5013 drives the steam absorption molecular sieve 5016 to be separated from the water removal box 5011, and the steam absorption molecular sieve 5016 can be removed.

Claims

1. A hot blast furnace circulation heating device, comprising an acidification roasting kiln (1) and a hot blast furnace (2) used in conjunction with the acidification roasting kiln (1), characterized in that: The hot gas outlet of the hot blast furnace (2) is connected to the heat exchange inlet of the acidification roasting kiln (1) through a pipeline, one end of the combustion nozzle of the hot blast furnace (2) is connected to a natural gas inlet pipe (3), the hot air inlet of the hot blast furnace (2) is connected to the air outlet of the air-to-air heat exchange component (4) through a pipeline, the heat exchange outlet of the acidification roasting kiln (1) is connected to a high-temperature circulation component (5), and the output end of the high-temperature circulation component (5) is respectively connected to the flue gas inlet of the air-to-air heat exchange component (4) and the circulating air inlet of the hot blast furnace (2) through a three-way valve.

2. A hot blast furnace circulation heating device according to claim 1, characterized in that: A first regulating valve (6) is provided between the three-way valve and the circulating air inlet of the hot air furnace (2), a second regulating valve (7) is provided between the three-way valve and the hot air inlet of the air-to-air heat exchange component (4), and a third regulating valve (8) is provided on the surface of the natural gas inlet pipe (3).

3. A hot blast furnace circulation heating device according to claim 1, characterized in that: The air inlet of the air-to-air heat exchange component (4) is connected to the outlet of the air fan (9) through a pipeline, and the smoke outlet of the air-to-air heat exchange component (4) is connected to the inlet of the smoke exhaust fan (10) through a pipeline.

4. A hot blast furnace circulation heating device according to claim 1, characterized in that: The high-temperature circulation component (5) comprises a dewatering component (501) and a high-temperature circulation fan (502), and an air outlet of the dewatering component (501) is connected to an air inlet of the high-temperature circulation fan (502) via a pipeline; The air inlet of the water removal component (501) is connected to the heat exchange outlet of the acidification roasting kiln (1) through a pipeline, and the air outlet of the high-temperature circulation fan (502) is connected to the hot air inlet of the air-to-air heat exchange component (4) and the circulating air inlet of the hot air furnace (2) through a three-way valve.

5. A hot blast furnace circulation heating device according to claim 4, characterized in that: The dewatering assembly (501) comprises a dewatering box (5011), two first dewatering frames (5012) and two second dewatering frames (5013) are penetrated through and slidably mounted on the bottom of the dewatering box (5011), a blocking plate (5014) is fixedly mounted on the bottom of the two first dewatering frames (5012) and the two second dewatering frames (5013), an assembly groove (5015) is provided on the front of the two first dewatering frames (5012) and the two second dewatering frames (5013), a steam absorbing molecular sieve (5016) is slidably mounted inside the assembly groove (5015), air ports (5017) connected to the assembly groove (5015) are provided on both sides of the two first dewatering frames (5012) and the two second dewatering frames (5013), and the two first dewatering frames (5012) are arranged between the two second dewatering frames (5013); A sleeve (5018) is rotatably mounted on the top of the opposite side of the first dewatering frame (5012) and the second dewatering frame (5013); a guide rod (5019) is passed through the opposite ends of the two sleeves (5018); the guide rod (5019) is rotatably mounted on the inner wall of the dewatering box (5011) via a pin shaft; An electric telescopic rod (50110) is fixedly mounted on the bottom of the dewatering tank (5011), a driving frame (50111) is fixedly mounted on the telescopic end of the electric telescopic rod (50110), and the tops of both sides of the driving frame (50111) are respectively fixedly connected to the opposite sides of the bottom blocking plates (5014) of the two first dewatering frames (5012).

6. A hot blast furnace circulation heating device according to claim 5, characterized in that: Sealing pads (50112) are fixedly installed on both sides of the two first dewatering racks (5012) and the two second dewatering racks (5013) and above the air outlet (5017).

7. A hot blast furnace circulation heating device according to claim 6, characterized in that: The two sides of the dewatering box (5011) are respectively connected with an air inlet flange (50113) and an air outlet flange (50114); the air inlet flange (50113) is connected to the heat exchange outlet of the acidification roasting kiln (1) through a pipeline, and the air outlet flange (50114) is connected to the air inlet of the high-temperature circulation fan (502) through a pipeline.

8. A method for using a hot blast furnace circulation heating device, characterized in that: The method is implemented using a hot blast stove circulation heating device according to any one of claims 1 to 7, and specifically comprises the following steps: Step 1: The air blower (9) accelerates the air to enter the air-to-air heat exchange component (4), and then enters the hot blast furnace (2). The natural gas enters the combustion nozzle of the hot blast furnace (2) through the natural gas inlet pipe (3), ignites the natural gas, and the generated high-temperature gas is accelerated and transported to the acidification roasting kiln (1); Step 2: high-temperature gas enters the jacket of the acidification roasting kiln (1) to increase the internal environment temperature of the acidification roasting kiln (1). During the process, the high-temperature gas is cooled to medium-temperature gas; Step 3: The medium-temperature gas enters the water removal box (5011) through the air inlet flange (50113), passes through the air port (5017), is screened by a steam absorption molecular sieve (5016) to remove water vapor in the medium-temperature gas, and then passes through the air port (5017) to be screened by another steam absorption molecular sieve (5016) to remove water vapor in the medium-temperature gas; Part of the medium-temperature gas is transported to the air-to-air heat exchange component (4) by the high-temperature circulation fan (502); the medium-temperature gas exchanges heat with the air entering the air-to-air heat exchange component (4) in the air-to-air heat exchange component (4), and then is discharged through the smoke exhaust fan (10) at an accelerated speed; The remaining medium-temperature gas is transported by the high-temperature circulation fan (502) to the hot blast furnace (2) for mixing with air.

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