Heat exchange hot blast stove

Abstract

The utility model provides a heat exchange hot-blast stove which comprises a feeding system, a combustion chamber, heat exchange chambers, air guide chambers, an air feeder and a control system, a hot-blast stove body is square, the combustion chamber is arranged in the middle of the hot-blast stove body, the heat exchange chambers are arranged on the two sides of the combustion chamber, and the air guide chambers are arranged on the upper sides and the lower sides of the heat exchange chambers. The air feeder is arranged at the top of the hot-blast stove body, the control system is arranged beside the hot-blast stove body, the feeding system is arranged beside the hot-blast stove body and supplies fuel to the combustion chamber, the air guide chamber is communicated with the combustion chamber through an air guide pipe, and a hot air outlet is formed in one side of the heat exchange chamber. A positive pressure type feeding system is adopted, part of oxygen can be supplemented while feeding is conducted, tempering is effectively prevented, and meanwhile combustion sufficiency is guaranteed; the combustion chamber is provided with upper and lower oxygen supply devices to ensure sufficient combustion of fuel in the hearth; the circular heat exchange system is matched with the air feeder, cold air and hot air exchange heat around the high-temperature area of the hearth, the effective heat exchange area is larger, and heat exchange is more sufficient.

Description

Technical Field

[0001] The utility model relates to the technical field of grain drying, in particular to a heat exchange hot air furnace. Background Art

[0002] Hot air furnaces are widely used for drying grains. They feature a simple structure, clean hot air, and low drying costs. They consist of various components, including a feed mechanism, combustion chamber, heat exchange chamber, and control system. These components are driven by motors, which drive the mechanical structure to achieve continuous combustion. As hot air furnaces mature, their cost has become a key concern. High heat exchange efficiency can significantly reduce fuel costs.

[0003] The heat exchange efficiency of a hot blast stove, as the name implies, is the proportion of effectively utilized heat energy to the total heat energy output value of the hot blast stove. The higher the proportion, the higher the heat exchange efficiency of the hot blast stove, the higher the heat energy utilization rate, and the lower the fuel cost.

[0004] Hot blast furnaces generate heat from fuel combustion. Part of this heat is drawn out by the induced draft fan (IDF) and then exhausted. Part is exchanged through the heat exchange system and utilized by the equipment. Still another portion is naturally dissipated to the outside air through heat conduction and radiation from the mechanical structure. Only the heat energy exchanged through the heat exchange system is truly desirable. However, the amount of heat energy generated by this exchange is significantly dependent on the furnace's combustion system, heat exchange system, and control method. Different structural designs and parameter ratios lead to significant variations in performance. Currently, most hot blast furnaces utilize a single grate for oxygen-based combustion and large front-to-back heat exchange channels. This simplistic hot air control method results in large temperature fluctuations and instability. With a single grate for oxygen-based combustion, fuel combustion is concentrated in the grate area. Excessive or insufficient fuel intake can lead to incomplete combustion. This incompletely burned fuel granulates and is then discharged through the IDF, resulting in incomplete combustion and significant resource waste. Large front-to-back heat exchange channels offer a large heat exchange area but low utilization, resulting in high structural costs. The published patent 2019105390919 discloses a high-frequency electromagnetic induction hot air furnace for grain drying, comprising a hot air furnace housing, a fan and a high-frequency electromagnetic induction furnace; a hot air outlet is provided on the surface of the hot air furnace housing; the fan is installed in the hot air furnace housing, and the air outlet end is installed in conjunction with the high-frequency electromagnetic induction furnace; the high-frequency electromagnetic induction furnace comprises, from the inside to the outside, an inner tube furnace body, an insulating tube, an insulating cloth layer, and an electromagnetic coil. The present invention has a simple and novel structure. Through the provision of the insulating tube and the inner tube furnace body, heat can be dissipated both inside and outside, effectively improving the heat conduction efficiency. In combination with the fan input, it can meet the temperature, air volume, and air pressure requirements for grain drying, significantly improving the drying quality of the grain. However, the above structure still has the problem of a large heat exchange area but low utilization rate, resulting in high structural cost. Therefore, it is particularly important to solve the problem of the complex structure and low fuel combustion utilization rate of ordinary air exchangers. Utility Model Content

[0005] The purpose of the utility model is to provide a heat exchange hot air furnace, which includes components such as a combustion chamber, a heat exchange chamber, a feeding system and a control system. The feeding system realizes precise feeding through a control module, and the fuel is fully burned in the combustion chamber and then heat exchanged through the heat exchange chamber. The exchanged pure hot air is supplied to the equipment for use, thereby realizing secondary combustion of the fuel, circular heat exchange of hot air and precise control of temperature. The utility model has a simple structure and a long practical life, and solves the problems of complex structure and low fuel combustion utilization rate of ordinary fan.

[0006] The utility model provides a heat exchange hot blast stove, comprising a feeding system, a combustion chamber, a heat exchange chamber, an air guide chamber, a blower and a control system. The hot blast stove main body is square, the combustion chamber is arranged in the middle position of the hot blast stove main body, the heat exchange chamber is arranged on both sides of the combustion chamber, the air guide chamber is arranged on the upper and lower sides of the heat exchange chamber, the blower is arranged on the top of the hot blast stove main body, the control system is arranged next to the hot blast stove main body, the feeding system is arranged next to the hot blast stove main body, fuel is supplied to the combustion chamber, the air guide chamber is connected with the combustion chamber through an air guide pipe, and a hot blast outlet is opened on one side of the heat exchange chamber.

[0007] A further improvement is that the combustion chamber includes a grate, a furnace, a furnace door, and a smoke exhaust fan, the furnace door is arranged on one side of the lower part of the furnace, the smoke exhaust fan is arranged on the top of the furnace, and a ash cleaning chamber is arranged at the lower end of the furnace.

[0008] A further improvement is that the air guide chamber is divided into an upper air guide chamber and a lower air guide chamber, and the air guide pipe connects the upper air guide chamber, the lower air guide chamber and the furnace of the combustion chamber.

[0009] A further improvement is that heat exchange tubes are arranged around the furnace, and the heat exchange tubes are evenly distributed in a circular shape with the furnace as the center, and are divided into different heat exchange chambers by the upper air guide chamber and the lower air guide chamber. The hot air temperature in the heat exchange chamber is distributed from high to low.

[0010] Further improvements are: an air inlet is provided at the top of the furnace, the blower is arranged at the top of the air inlet, and a hot air outlet is provided at the outer wall of the combustion chamber. Under the action of the blower, the external gas enters the heat exchange chamber and exchanges heat with the heat exchange tube and the outer wall of the furnace. The hot air after heat exchange is discharged from the hot air outlet and enters the drying equipment for use.

[0011] A further improvement is that a secondary oxygen supply device is provided in the middle of the furnace, and secondary oxygen is supplied to the furnace through the secondary oxygen supply device.

[0012] Further improvements are: the heat exchange chamber includes a first heat exchange chamber, a second heat exchange chamber, a third heat exchange chamber, a fourth heat exchange chamber and heat exchange pipes, the heat exchange pipes are arranged in a circle around the furnace, and a cold air inlet and a hot air inlet are provided on the heat exchange chamber. The first heat exchange chamber includes a top area air guide chamber and a bottom area air guide chamber. The high-temperature gas is transmitted to the bottom area air guide chamber by the heat exchange pipe. The bottom area air guide chamber is connected to the second heat exchange chamber. The high-temperature gas is then transmitted to the top area of the second heat exchange chamber through the heat exchange pipe of the second heat exchange chamber. It is transmitted through the third heat exchange chamber and the fourth heat exchange chamber in sequence according to this rule, and is finally discharged to the outdoors by the smoke exhaust fan at the top of the fourth heat exchange chamber.

[0013] The beneficial effects of this utility model include: a positive pressure feeding system that replenishes oxygen while feeding, effectively preventing backfire and ensuring complete combustion; upper and lower oxygen supply devices in the combustion chamber ensure complete combustion of the fuel within the furnace; a circular heat exchange system, coupled with a blower, allows cold and hot air to exchange heat around the high-temperature area of the furnace, resulting in a larger effective heat exchange area and more complete heat exchange. The hot blast furnace is equipped with an intelligent temperature control system that can precisely control the feeding and exhaust speed and time according to the set temperature value, protecting the hot blast furnace while reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is an overall internal schematic diagram of the present utility model.

[0016] Figure 3 It is a structural principle diagram of the combustion chamber of the present utility model.

[0017] Figure 4 It is a top view of the hot blast stove of the present utility model.

[0018] Among them: 1-feeding system, 2-combustion chamber, 3-heat exchange chamber, 4-air guide chamber, 5-air blower, 6-control system, 7-air guide duct, 8-hot air outlet, 9-ash cleaning chamber, 10-heat exchange pipe, 21-furnace, 22-furnace door, 23-smoke exhaust fan, 31-first heat exchange chamber, 32-second heat exchange chamber, 33-third heat exchange chamber, 34-fourth heat exchange chamber, 41-upper air guide chamber, 42-lower air guide chamber. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0020] like Figure 1-4As shown, this embodiment provides a heat exchange hot blast furnace, comprising a feeding system 1, a combustion chamber 2, a heat exchange chamber 3, an air guide chamber 4, a blower 5, and a control system 6. The hot blast furnace body is square, with the combustion chamber 2 located in the middle of the hot blast furnace body, the heat exchange chamber 3 located on both sides of the combustion chamber 2, the air guide chamber 4 located on the upper and lower sides of the heat exchange chamber 3, the blower 5 located at the top of the hot blast furnace body, and the control system 6 located next to the hot blast furnace body. The feeding system 1 is located next to the hot blast furnace body to supply fuel to the combustion chamber 2. The air guide chamber 4 is connected to the combustion chamber 2 via an air guide duct 7, and a hot air outlet 8 is provided on one side of the heat exchange chamber 3. The combustion chamber 2 comprises a grate, a furnace 21, a furnace door 22, and a smoke exhaust fan 23. The furnace door 22 is located on one side of the lower portion of the furnace 21, and the smoke exhaust fan 23 is located at the top of the furnace 21. A dust cleaning chamber 9 is provided at the lower end of the furnace 21. The air guide chamber 4 is divided into an upper air guide chamber 41 and a lower air guide chamber 42. The air guide pipe 7 connects the upper air guide chamber 41, the lower air guide chamber 42 and the furnace 21 of the combustion chamber 2. The outer periphery of the furnace 21 is provided with a heat exchange tube 10. The heat exchange tube 10 is evenly distributed in a circular shape with the furnace 21 as the center, and is staggered and divided into different heat exchange chambers by the upper air guide chamber 41 and the lower air guide chamber 42. The hot air temperature of the heat exchange chamber is distributed from high to low. The top of the furnace 21 is provided with an air inlet. The blower 5 is provided at the top of the air inlet. The outer wall of the combustion chamber 2 is provided with a hot air outlet 8. Under the action of the blower 5, the external gas enters the heat exchange chamber 3 and exchanges heat with the heat exchange tube 10 and the outer wall of the furnace 21. The hot air after heat exchange is discharged from the hot air outlet 8 and enters the drying equipment for use. The middle part of the furnace 21 is provided with a secondary oxygen supply device, which supplies secondary oxygen to the furnace 21 through the secondary oxygen supply device. The heat exchange chamber 3 includes a first heat exchange chamber 31, a second heat exchange chamber 32, a third heat exchange chamber 33, a fourth heat exchange chamber 34 and a heat exchange tube 10. The heat exchange tube 10 is arranged in a circle around the furnace 21. A cold air inlet 36 and a hot air inlet 37 are provided on the heat exchange chamber 3. The first heat exchange chamber 31 includes a top area air guide chamber and a bottom area air guide chamber. The high-temperature gas is transmitted to the bottom area air guide chamber by the heat exchange tube 10. The bottom area air guide chamber is connected to the second heat exchange chamber 32. The high-temperature gas is then transmitted to the top area of the second heat exchange chamber 32 through the heat exchange tube 10 of the second heat exchange chamber 32. According to this rule, it is transmitted through the third heat exchange chamber 33 and the fourth heat exchange chamber 34 in sequence, and is finally discharged to the outside by the smoke exhaust fan 23 at the top of the fourth heat exchange chamber 34.

[0021] See also Figure 1The hot blast furnace consists of a feeding system 1, a combustion chamber 2, a heat exchange chamber 3, an air guide chamber 4, a blower 5 and a control system 6. The main body of the hot blast furnace is square, in which the combustion chamber 2 is located in the middle of the main body. From bottom to top, it includes a cleaning chamber 9, a grate, a furnace 21 and an air guide duct 7. After the fuel is burned in the combustion chamber 2, it enters the air guide chamber 4 and the heat exchange chamber 3 through the air guide duct 7 for heat exchange under the action of the exhaust fan 23.

[0022] See also Figure 1 The heat exchange chamber 3 is located around the combustion chamber 2 and is circular in shape. It is composed of an upper air guide chamber 41, a lower air guide chamber 42 and a heat exchange tube 10, etc. It is used for cold and hot air exchange for use by the required equipment.

[0023] See also Figure 1 The left side of the figure shows the fuel feeding system 1, which consists of a bag rack, a hopper, a feeding motor, a feeding fan and other parts. The fuel naturally enters the feeding pipe along the hopper due to gravity, and enters the combustion chamber 2 for combustion under the pressure of the feeding fan.

[0024] See also Figure 1 The cold air enters the heat exchange chamber 3 from the top of the combustion chamber 2 through the blower 5, and after fully exchanging heat with high-temperature components such as the furnace 21 and the heat exchange tube 10, it is discharged from the hot air outlet 8 at the bottom right of the figure. During the whole process, the hot air exchanges heat in the high-temperature area around the combustion chamber 2, which can not only quickly cool the furnace 21 and increase the service life of the furnace 21, but also greatly improve the heat exchange efficiency.

[0025] refer to Figure 2 The figure shows that the ash cleaning chamber 9 is located at the bottom of the furnace 21 and the heat exchange tube 10, inside the lower air duct 42, which is used to clean the dust and impurities generated by the hot air during the heat exchange process. The combustion chamber 2 is located in the middle of the main body and includes parts such as the grate, furnace 21, furnace door 22, air duct 7 and smoke exhaust fan 23. Among them, the furnace door 22, air duct 7 and furnace 21 are all made of stainless steel plates, which have strong antioxidant capabilities and high thermal conductivity. The furnace 21 is connected to the upper air duct 41 and the lower air duct 42, and is circular in shape. The gas enters the furnace 21 from the bottom grate and the oxygen supply fan, providing sufficient oxygen for the fuel to fully burn. Under the action of the smoke exhaust fan 23, the burned gas enters the upper air duct 41 through the air duct 7, and then passes through the heat exchange tube 10 to penetrate the upper and lower air ducts back and forth, and is finally discharged to the outside by the smoke exhaust fan 23.

[0026] refer to Figure 2 As shown in the figure, the heat exchange tubes 10 are evenly distributed around the furnace 21 in a circular state, and are divided into different heat exchange chambers 3 by the upper air guide chamber 41 and the lower air guide chamber 42. The hot air temperature of the heat exchange chamber 3 is distributed from high to low.

[0027] refer to Figure 2An air inlet is provided at the top of the furnace 21, and a blower 5 is installed at the top of the air inlet. Under the action of the blower 5, the external gas enters the heat exchange chamber 3 and exchanges heat with the heat exchange tube 10 and the outer wall of the furnace 21. The hot air after heat exchange is discharged from the hot air outlet 8 and enters the drying equipment for use.

[0028] refer to Figure 2 The feeding device 1 shown is located on one side of the furnace 21 and provides the necessary fuel for combustion. The system includes a feeding motor, a feeding fan, an oxygen supply fan, an auger, a hopper, and a ladle rack. The feeding motor and oxygen supply fan are both adjustable and work with an intelligent control system to achieve precise temperature control.

[0029] refer to Figure 2 The control system 2, shown below the feeding device 1, primarily controls the operation of the various motors and fans. The feeding motor and exhaust fan feature variable speeds. The PLC temperature control system adaptively controls the start and stop of related electrical appliances, as well as parameter settings, in different operating environments, achieving precise temperature control.

[0030] See also Figure 3 The diagram shows the combustion chamber structure, which consists of a grate, a furnace 21, a furnace door 22, a secondary oxygen supply device, an air duct 7, and a smoke exhaust fan 23. The smoke exhaust fan 23 allows some gas to enter the furnace 21 through the gap between the bottom grate and the combustion basin, where it is used to burn the fuel in the combustion basin.

[0031] While feeding the fuel, the feed fan also provides some oxygen above the combustion basin to aid the combustion of the fuel. The third part of the gas enters the furnace 21 through the waist-positioned oxygen supply device. The function of this device is to provide combustion-supporting oxygen in the upper middle part of the furnace 21, achieving a secondary combustion function for some incompletely burned fuel or flue gas.

[0032] See also Figure 4 The figure shows a top view of the hot blast furnace. The hot gas after combustion enters the first heat exchange chamber 31 through the hot air inlet shown. The heat exchange chamber 3 comprises a top and bottom air duct A, along with heat exchange pipes in these areas. The hot gas is transferred via the heat exchange pipes to the bottom air duct A, which connects to the second heat exchange chamber 32. The hot gas then flows through the heat exchange pipes of the second heat exchange chamber 32 to the top area of the second heat exchange chamber 32. Similarly, the hot gas sequentially passes through the third and fourth heat exchange chambers 33 and 34, ultimately being discharged outdoors by the exhaust fan at the top of the fourth heat exchange chamber 34.

[0033] See also Figure 4 The heat exchange tubes are arranged in a circular shape around the furnace and are arranged tightly. Under the premise of keeping the penetration cross-sectional area unchanged, the uniformity of heat exchange of each heat exchange tube is guaranteed, the heat exchange area of the heat exchange tube is fully utilized, and the heat exchange efficiency is greatly improved.

Claims

1. A heat exchange hot air stove, characterized in that: The hot blast furnace comprises a feeding system (1), a combustion chamber (2), a heat exchange chamber (3), an air guide chamber (4), an air blower (5) and a control system (6). The hot blast furnace body is square, the combustion chamber (2) is arranged in the middle of the hot blast furnace body, the heat exchange chamber (3) is arranged on both sides of the combustion chamber (2), the air guide chamber (4) is arranged on the upper and lower sides of the heat exchange chamber (3), the air blower (5) is arranged on the top of the hot blast furnace body, the control system (6) is arranged next to the hot blast furnace body, the feeding system (1) is arranged next to the hot blast furnace body to supply fuel to the combustion chamber (2), the air guide chamber (4) is connected to the combustion chamber (2) through an air guide pipe (7), and a hot blast outlet (8) is opened on one side of the heat exchange chamber (3).

2. The heat exchange hot air stove according to claim 1, characterized in that: The combustion chamber (2) comprises a grate, a furnace (21), a furnace door (22), and a smoke exhaust fan (23); the furnace door (22) is arranged on one side of the lower part of the furnace (21); the smoke exhaust fan (23) is arranged on the top of the furnace (21); and a dust cleaning chamber (9) is provided at the lower end of the furnace (21).

3. The heat exchange hot air stove according to claim 2, characterized in that: The air guide chamber (4) is divided into an upper air guide chamber (41) and a lower air guide chamber (42), and the air guide pipe (7) is connected to the upper air guide chamber (41), the lower air guide chamber (42) and the furnace (21) of the combustion chamber (2).

4. The heat exchange hot air stove according to claim 3, characterized in that: Heat exchange tubes (10) are arranged on the periphery of the furnace (21). The heat exchange tubes (10) are evenly distributed in a circular shape around the furnace (21) and are divided into different heat exchange chambers by an upper air guide chamber (41) and a lower air guide chamber (42). The hot air temperature of the heat exchange chambers is distributed from high to low.

5. The heat exchange hot air stove according to claim 2, characterized in that: An air inlet is provided at the top of the furnace (21), the blower (5) is arranged at the top of the air inlet, and a hot air outlet (8) is provided at the outer wall of the combustion chamber (2). Under the action of the blower (5), external gas enters the heat exchange chamber (3) and performs heat exchange with the heat exchange tube (10) and the outer wall of the furnace (21). The hot air after the heat exchange is discharged from the hot air outlet (8) and enters the drying equipment for use.

6. The heat exchange hot air stove according to claim 2, characterized in that: A secondary oxygen supply device is provided in the middle of the furnace (21), and secondary oxygen is supplied to the furnace (21) through the secondary oxygen supply device.

7. The heat exchange hot air stove according to claim 1, characterized in that: The heat exchange chamber (3) includes a first heat exchange chamber (31), a second heat exchange chamber (32), a third heat exchange chamber (33), a fourth heat exchange chamber (34) and a heat exchange tube (10). The heat exchange tube (10) is arranged in a circular shape around the furnace (21). A cold air inlet (36) and a hot air inlet (37) are provided on the heat exchange chamber (3). The first heat exchange chamber (31) includes a top area air guide chamber and a bottom area air guide chamber. The high-temperature gas is transmitted to the bottom area air guide chamber by the heat exchange tube (10). The bottom area air guide chamber is connected to the second heat exchange chamber (32). The high-temperature gas is then transmitted to the top area of the second heat exchange chamber (32) through the heat exchange tube (10) of the second heat exchange chamber (32). According to this rule, the high-temperature gas is sequentially transmitted through the third heat exchange chamber (33) and the fourth heat exchange chamber (34), and finally discharged to the outside by the smoke exhaust fan (23) at the top of the fourth heat exchange chamber (34).

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