A drying kiln with air blowing and heat exchange strengthening

Abstract

The utility model relates to drying equipment technical field discloses a kind of drying kiln of blast intensification heat exchange, comprising: hot blast furnace, drying kiln, fire dam, air induction heat exchange component and blast heat exchange component;Hot blast furnace and drying kiln are along the first direction arrangement, and the one end of hot blast furnace away from drying kiln is provided with burner hole and observation hole, and the hot blast outlet of hot blast furnace is communicated with the hot blast import of drying kiln, and fire dam is located in the hearth of hot blast furnace, air induction heat exchange component includes air induction fan and air induction pipeline, air induction fan is connected with air induction pipeline, and air induction pipeline is communicated with the inner chamber of drying kiln through the discharge port of drying kiln, and blast heat exchange component includes the blast fan and blast pipeline connected;Blast pipeline is inserted into hot blast furnace through observation hole, and it is towards fire dam. By adding blast fan, the flow of hot flue gas in hot blast furnace and drying kiln can be promoted, which helps hot flue gas enter the drying kiln, makes hot flue gas fully contact with material, and improves drying efficiency.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, specifically a drying kiln with enhanced heat exchange through forced air circulation. Background Technology

[0002] Currently, sintering drying kilns employ hot air drying systems. Through thorough contact between hot air and the material, the moisture in the material evaporates, achieving the drying purpose. Specifically, the material is conveyed to the feed end of the drying kiln via belt conveyors and other equipment. High-temperature flue gas is generated by the burner and conveyed into the drying kiln through a baffle wall. Inside the kiln, the material continuously tumbles and moves with the rotation of the cylinder, undergoing thorough heat exchange with the hot air. The moisture in the material gradually evaporates under the action of the hot air, thus achieving the drying effect. The dried material is discharged from the discharge end of the drying kiln and conveyed to the next process via belt conveyors and other equipment.

[0003] Problems exist:

[0004] When the high-temperature flue gas generated by the burner is transported to the drying kiln drum, it must pass through a baffle wall to prevent the flame from directly entering the kiln. However, due to the burner's small size, the hot air from the hot blast stove furnace cannot be sent into the drum for heat exchange, thus limiting the drying capacity. Simply using an induced draft fan to draw hot air from the furnace to create a vortex within the furnace results in the hot air not being able to escape, making the furnace chamber prone to burn-out. Utility Model Content

[0005] The purpose of this invention is to provide a drying kiln with enhanced heat exchange by blowing air, which can promote the flow of hot flue gas in the furnace of the hot blast stove, avoid the stagnation of hot air in the furnace, and improve drying efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A drying kiln with enhanced heat exchange by forced air circulation, comprising:

[0008] A hot air furnace and a drying kiln are arranged sequentially along the first direction. The hot air furnace is provided with a burner hole and an observation hole at the end away from the drying kiln. The hot air furnace has a hot air outlet at the end near the drying kiln. The drying kiln has a hot air inlet at the end near the hot air furnace. The hot air inlet is connected to the hot air outlet. The drying kiln has a discharge port at the end away from the hot air furnace. The drying kiln has a feed port on one side wall near the hot air furnace.

[0009] Firebreak wall, which is located inside the furnace of the hot blast stove.

[0010] An induced draft heat exchange assembly includes an induced draft fan and an induced draft duct. The air inlet of the induced draft fan is connected to the first end of the induced draft duct, and the second end of the induced draft duct is connected to the inner cavity of the drying kiln via the discharge port of the drying kiln.

[0011] A forced-air heat exchange assembly includes a blower and a forced-air duct. The forced-air duct extends into the hot air furnace through an observation hole. The outlet of the blower is connected to the first end of the forced-air duct, and the second end of the forced-air duct faces the fire baffle wall. This arrangement, by adding a blower, promotes the flow of hot flue gas within the furnace, ensuring sufficient contact between the material and the hot flue gas, and improving drying efficiency.

[0012] Furthermore, it also includes an air guide hood, which has a small-diameter end and a large-diameter end. The small-diameter end of the air guide hood is connected to the second end of the blower duct, and the large-diameter end of the air guide hood faces the fire baffle. By setting the air guide hood, the airflow path can be optimized, and in conjunction with the fire baffle, it can promote the flow of hot flue gas in the drying kiln and hot air furnace.

[0013] Furthermore, the sidewall of the air guide shroud forms an angle of 10° to 20° with the sidewall of the blower duct, so that the second end of the blower duct opens outward by 10° to 20°. This arrangement expands the outlet area of ​​the airflow and enhances its ability to turbulentize hot flue gas.

[0014] Furthermore, the large diameter of the air guide shroud is 500mm to 600mm, and the length from the small diameter end to the large diameter end of the air guide shroud is 400mm to 550mm.

[0015] Furthermore, the fire baffle is a quadrangular prism, having a first, second, third, and fourth prism. Each of these prisms has a gap between itself and the inner wall of the furnace. The first and second prisms are positioned opposite each other, as are the third and fourth prisms. The first prism faces the burner orifice, and the second prism faces the hot air outlet. The second end of the blower duct is close to the plane containing either the first or third prism, and faces the first prism. Setting the fire baffle in a quadrangular prism shape reduces the resistance to hot flue gas flow and guides the hot air flow. Positioning the blower duct on one side of the prism face on either side of the first prism minimizes the obstruction of the hot flue gas flow from the burner orifice towards the first prism by the air guide shroud.

[0016] Furthermore, the plane containing the first and second edges of the fire barrier is parallel to the first direction, and the plane containing the third and fourth edges of the fire barrier is parallel to the second direction, which is perpendicular to the first direction. That is, the prismatic faces on both sides of the first edge are symmetrical along the first edge; the prismatic faces on the two sides adjacent to the second edge are symmetrical along the second edge. After the hot flue gas is diverted by the first edge, the resulting vortex moves along the prismatic faces on both sides of the second edge, assisting in entering the hot air outlet and further reducing air resistance.

[0017] Furthermore, the distance from the center point of the large-diameter end of the air guide hood to the first edge is 1800mm to 2200mm; the height of the air guide hood along the third direction is located at one-half to three-quarters of the height of the fire baffle, and the third direction is vertical, with the first direction, the second direction, and the third direction being perpendicular to each other. By reasonably setting the distance between the air guide hood and the first edge, as well as the relative position of the air guide hood and the fire baffle, the obstruction of the hot smoke airflow by the air guide hood is minimized while ensuring the airflow disturbance effect.

[0018] Furthermore, the distance from the second edge to the hot air outlet is between one-eighth and one-fifth of the length of the furnace chamber along the first direction. The distance between the third and fourth edges of the fire baffle is greater than the length of the hot air outlet along the second direction. Through multiple experiments, the installation position of the fire baffle was determined, and the distance between the third and fourth edges was shortened by 60 cm, effectively reducing the resistance of hot flue gas passing through the hot blast furnace and increasing the airflow.

[0019] Furthermore, the central axis of the hot air furnace and the central axis of the drying kiln are collinear and both extend along the first direction. This arrangement facilitates the entry of hot flue gas from the hot air furnace into the drying kiln.

[0020] Furthermore, the observation hole has a size of 400*400mm, and the diameter of the blower duct is DN350mm. The blower duct can be directly connected to the observation hole, eliminating the need for a separate opening in the hot air furnace, thus simplifying implementation.

[0021] Furthermore, the furnace chamber of the hot blast stove is cylindrical, and the cross-section of the furnace chamber is changed from arched to circular, effectively reducing the dead zone of flame combustion and improving combustion efficiency. The top of the hot blast stove has a flue gas vent communicating with its furnace chamber. The flue gas vent is connected to a dust removal equipment duct to discharge excess flue gas.

[0022] This invention has the following advantages over the prior art:

[0023] 1. This utility model discloses a drying kiln with enhanced heat exchange by forced air circulation, comprising a hot air furnace and a drying kiln connected in series. A fire baffle wall is installed inside the hot air furnace. An induced draft pipe is installed at the discharge port of the drying kiln and is connected to an induced draft fan outside the drying kiln. An opening is made at the observation port, and a blower is installed thereon. The blower's duct enters the hot air furnace through the opening at the observation port and faces the fire baffle wall. When the induced draft fan operates and draws high-temperature flue gas generated by the combustion aid into the drying drum of the drying kiln through the fire baffle wall, the airflow blown by the added blower can promote the flow of hot flue gas in the hot air furnace and the drying kiln, which helps the hot flue gas enter the drying kiln and make the hot flue gas fully contact the material, thereby improving the drying efficiency.

[0024] 2. The fire baffle in this utility model is a quadrangular prism. The first edge of the fire baffle is directly opposite the burner hole, and the second edge is directly opposite the hot air outlet. The two prism faces adjacent to the first edge are symmetrically arranged along the first edge, and the two prism faces adjacent to the second edge are symmetrically arranged along the second edge. After the hot flue gas entering through the burner hole is diverted by the first edge, the vortex formed will move along the prism faces on both sides of the second edge, assisting in entering the hot air outlet and further reducing the resistance of air movement. The blower nozzle is aligned with the first edge of the fire baffle, which can accelerate the flow of high-temperature flue gas and increase the air volume. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the drying kiln with enhanced heat exchange by forced air in an embodiment of this utility model;

[0026] In the diagram: 1. Hot blast stove; 101. Burner hole; 102. Observation hole; 103. Hot air outlet; 2. Drying kiln; 201. Hot air inlet; 202. Discharge port; 203. Feed port; 3. Fire baffle; 301. First edge; 302. Second edge; 303. Third edge; 304. Fourth edge; 4. Exhaust fan; 5. Exhaust duct; 6. Blower; 7. Blower duct; 8. Air guide hood; X, First direction; Y, Second direction. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be further discussed and described in the description of the subsequent figures.

[0031] Example:

[0032] like Figure 1 As shown, this utility model provides a drying kiln with enhanced heat exchange via forced air, comprising: along a first direction ( Figure 1A hot air furnace 1 and a drying kiln 2 are arranged sequentially in the X direction. The hot air furnace 1 has a burner hole 101 and an observation hole 102 at the end furthest from the drying kiln 2. The hot air furnace 1 has a hot air outlet 103 at the end closest to the drying kiln 2. The drying kiln 2 has a hot air inlet 201 at the end closest to the hot air furnace 1, and the hot air inlet 201 is connected to the hot air outlet 103. The drying kiln 2 has a discharge port 202 at the end furthest from the hot air furnace 1, and a feed inlet 203 is opened on one side wall of the drying kiln 2 closest to the hot air furnace. The system also includes a fire baffle wall 3 and an induced draft heat exchanger assembly. The system includes a draft fan 4 and a draft duct 5. The air inlet of the draft fan 4 is connected to the first end of the draft duct 5, and the second end of the draft duct 5 is connected to the inner cavity of the drying kiln 2 via the discharge port of the drying kiln 2. The draft heat exchange assembly includes a blower 6 and a blower duct 7. The blower duct 7 extends into the hot blast furnace 1 through an observation hole 102. The air outlet of the blower 6 is connected to the first end of the blower duct 7, and the second end of the blower duct 7 faces the fire wall 3. In this embodiment, the size of the observation hole 102 is 400*400mm, and the diameter of the blower duct 7 is DN350mm. The blower duct 7 is directly opened at the observation hole 102, eliminating the need for a separate opening in the hot blast furnace 1, which is convenient for implementation. The draft duct 5 of the draft fan 4 is directly extended into the drying kiln through the discharge port 202, simplifying the setup. To avoid affecting material discharge, the induced draft duct 5 is located above the discharge port 202. Before adding the blower, hot air from the hot blast furnace was drawn into the drying kiln solely by the induced draft fan. Increasing the suction of the induced draft fan would easily cause a large amount of cold air to enter through the feed inlet 203, resulting in a cyclone of hot flue gas within the hot blast furnace. This made it difficult for the hot air to enter the drying kiln, leading to potential furnace burnout, energy waste, and limited drying capacity. Adding the blower promotes the flow of hot flue gas within the furnace. Under the combined action of the blower and induced draft fan, the hot flue gas enters the drying kiln, ensuring sufficient contact between the material and the hot flue gas, effectively improving drying efficiency. By adjusting the airflow of the induced draft fan, the gas velocity and temperature distribution within the drying drum can be controlled, helping to maintain the balance of the drying system.

[0033] refer to Figure 1This embodiment also includes an air guide hood 8, which has a small-diameter end and a large-diameter end. The small-diameter end of the air guide hood 8 is connected to the second end of the blower duct 7, and the large-diameter end of the air guide hood 8 faces the fire baffle 3. By setting the air guide hood 8, the airflow path can be optimized, and it can cooperate with the fire baffle 3 to promote the flow of hot flue gas in the drying kiln and hot air furnace. The side wall of the air guide hood 8 has an angle of 10° to 20° with the side wall of the blower duct 7, so that the second end of the blower duct 7 opens outward by 10° to 20°. Through the above settings, the outlet area of ​​the airflow can be expanded, allowing it to contact the fire baffle 3 over a larger area and improving the disturbance capability of the hot flue gas. Specifically, the diameter of the large-diameter end of the air guide hood is 500mm to 600mm, such as 500mm, 550mm, 600mm, etc., preferably 500mm. The length from the small-diameter end to the large-diameter end of the air guide shroud is 400mm to 550mm, for example, 400mm, 500mm, 550mm, etc. By reasonably setting the size of the air guide shroud, it can achieve excellent airflow guiding effect. The length of the blower duct 7 extending into the hot blast furnace through the observation hole 102 is 3000mm to 4000mm, preferably 3500mm. This avoids the blower duct 7 extending too far into the hot blast furnace, which would interfere with the flow of hot air.

[0034] In this embodiment, the fire baffle 3 is a quadrangular prism. The fire baffle 3 has a first edge 301, a second edge 302, a third edge 303, and a fourth edge 304, each with a gap between itself and the inner wall of the furnace. The first edge 301 and the second edge 302 are positioned opposite each other, as are the third edge 303 and the fourth edge 304. The first edge 301 is directly opposite the burner orifice, and the distance from the burner orifice to the first edge 301 is 4200 mm. The second edge 302 is directly opposite the hot air outlet 103. The second end of the blower duct 7 is close to the plane containing the first edge 301 and the third edge 303, or the plane containing the first edge 301 and the fourth edge 304, and faces the first edge 301. Setting the fire baffle 3 in a quadrangular prism shape reduces the flow resistance of hot flue gas and guides the flow of hot air. The blower duct 7 is positioned on one of the prismatic faces on both sides of the first edge 301, minimizing the obstruction of the hot flue gas flow from the burner orifice 101 towards the first edge 301 by the air guide shroud 8. When the burner orifice 101 is close to the plane containing the first edge 301 and the third edge 303, the blower duct 7 extends into the hot blast furnace through the observation hole 102, with its second end close to the plane containing the first edge 301 and the third edge 303. When the burner orifice 101 is close to the plane containing the first edge 301 and the fourth edge 304, the blower duct 7 extends into the hot blast furnace through the observation hole 102, with its second end close to the plane containing the first edge 301 and the fourth edge 304. This arrangement prevents the blower duct from passing between the burner orifice and the first edge, thus avoiding interference with the hot flue gas ejected from the burner orifice.

[0035] The plane containing the first edge 301 and the second edge 302 of the fire barrier 3 is parallel to the first direction, and the plane containing the third edge 301 and the fourth edge 304 of the fire barrier 3 is parallel to the second direction. Figure 1 The first direction is parallel to the Y-direction, and the second direction is perpendicular to the first direction. That is, the prismatic surfaces on both sides of the first edge 301 are symmetrical along the first edge; the prismatic surfaces on the two sides adjacent to the second edge 302 are symmetrical along the second edge. After the hot flue gas is diverted by the first edge 301, the resulting vortex will move along the prismatic surfaces on both sides of the second edge, assisting in entering the hot air outlet and further reducing the resistance to air movement.

[0036] In this embodiment, the distance from the center point of the large-diameter end of the air guide hood 8 to the first edge 301 is 1800mm to 2200mm, such as 1800mm, 1900mm, 2000mm, 2100mm, 2200mm, etc., preferably 2000mm; the height of the air guide hood 8 along the third direction is located at one-half to three-quarters of the height of the fire wall 3, and the third direction is a vertical direction, with the first direction, the second direction, and the third direction being perpendicular to each other. By reasonably setting the distance between the air guide hood 8 and the first edge 301, as well as the relative position of the air guide hood 8 and the fire wall 3, the obstruction of the hot smoke airflow by the air guide hood 8 is minimized while ensuring the airflow disturbance effect.

[0037] The distance from the second edge 302 to the hot air outlet 103 is between one-eighth and one-fifth of the length of the furnace chamber of the hot blast stove 1 along the first direction. The distance between the third edge 303 and the fourth edge 304 of the fire baffle 3 is slightly greater than the length of the hot air outlet 103 along the second direction. Through multiple experiments, the installation position of the fire baffle 3 was determined, and the distance between the third edge 303 and the fourth edge 304 was shortened by 60 cm compared to the original, which effectively reduced the resistance of hot flue gas passing through the hot blast stove and increased the airflow.

[0038] In this embodiment, the central axis of the hot blast stove 1 and the central axis of the drying kiln 2 are collinear and both extend along the first direction. This arrangement facilitates the entry of hot flue gas into the drying kiln via the hot blast stove. The furnace chamber of the hot blast stove 1 is cylindrical, and the cross-section of the furnace chamber is changed from an arched shape to a circular shape, effectively reducing the dead zone of flame combustion and improving combustion efficiency. The top of the hot blast stove 1 has a flue gas vent (not shown in the figure) communicating with its furnace chamber. The flue gas vent is connected to a dust removal equipment duct for discharging excess flue gas.

[0039] In practice:

[0040] High-temperature flue gas is supplied through the burner orifice and flows towards the baffle wall. The induced draft fan and the blower operate, and the high-pressure airflow discharged by the blower blows towards the first edge of the baffle wall, promoting the flow of hot flue gas in the furnace of the hot blast stove. The induced draft fan draws the high-temperature flue gas into the drying kiln to dry the material inside. Increasing the blower can further promote the flow of hot flue gas in the furnace, allowing the material to fully contact the hot flue gas and improve drying efficiency. By adjusting the airflow of the induced draft fan, the gas velocity and temperature distribution in the drying kiln can be controlled, which helps to maintain the balance of the drying system.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drying kiln with enhanced heat exchange via forced draft, characterized in that, include: A hot air furnace and a drying kiln are arranged sequentially along the first direction. The hot air furnace is provided with a burner hole and an observation hole at the end away from the drying kiln. The hot air furnace has a hot air outlet at the end near the drying kiln. The drying kiln has a hot air inlet at the end near the hot air furnace. The hot air inlet is connected to the hot air outlet. The drying kiln has a discharge port at the end away from the hot air furnace. The drying kiln has a feed port on one side wall near the hot air furnace. Firebreak wall, which is located inside the furnace of the hot blast stove. An induced draft heat exchange assembly includes an induced draft fan and an induced draft duct. The air inlet of the induced draft fan is connected to the first end of the induced draft duct, and the second end of the induced draft duct is connected to the inner cavity of the drying kiln via the discharge port of the drying kiln. A blower heat exchange assembly, comprising a blower and a blower duct; the blower duct extends into the hot air furnace through an observation hole, the air outlet of the blower is connected to the first end of the blower duct, and the second end of the blower duct faces the fire baffle wall.

2. The drying kiln with enhanced heat exchange by forced draft as described in claim 1, characterized in that: It also includes an air guide hood, which has a small-diameter end and a large-diameter end. The small-diameter end of the air guide hood is connected to the second end of the blower duct, and the large-diameter end of the air guide hood faces the fire wall.

3. The drying kiln with enhanced heat exchange by forced draft as described in claim 2, characterized in that: The sidewall of the air guide shroud has an angle of 10° to 20° with the sidewall of the blower duct, so that the second end of the blower duct opens outward by 10° to 20°.

4. The drying kiln with enhanced heat exchange by forced draft as described in claim 3, characterized in that: The large diameter of the air guide shroud is 500mm~600mm, and the length from the small diameter end to the large diameter end of the air guide shroud is 400mm~550mm.

5. The drying kiln with enhanced heat exchange by forced draft as described in claim 2, characterized in that: The fire baffle is a quadrangular prism with a first edge, a second edge, a third edge, and a fourth edge. Each of the first, second, third, and fourth edges is spaced from the inner wall of the furnace. The first edge and the second edge are opposite each other, as are the third and fourth edges. The first edge is directly opposite the burner hole, and the second edge is directly opposite the hot air outlet. The second end of the blower pipe is close to the plane containing the first and third edges or the plane containing the first and fourth edges, and faces the first edge.

6. The drying kiln with enhanced heat exchange by forced draft as described in claim 5, characterized in that: The distance from the center point of the large diameter end of the air guide hood to the first edge is 1800 mm to 2200 mm; the height of the air guide hood along the third direction is located at one-half to three-quarters of the height of the fire wall, the third direction is a vertical direction, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The drying kiln with enhanced heat exchange by forced draft as described in claim 6, characterized in that: The distance from the second edge to the hot air outlet is between one-eighth and one-fifth of the length of the furnace chamber along the first direction of the hot air stove.

8. The drying kiln with enhanced heat exchange by forced draft as described in claim 1, characterized in that: The distance between the third and fourth edges of the fire barrier is greater than the length of the hot air outlet along the second direction.

9. The drying kiln with enhanced heat exchange by forced draft as described in claim 1, characterized in that: The central axis of the hot air furnace and the central axis of the drying kiln are collinear and both extend along the first direction.

10. The drying kiln with enhanced heat exchange by forced draft as described in claim 1, characterized in that: The furnace chamber of the hot air furnace is cylindrical, and the top of the hot air furnace has a flue gas vent communicating with the furnace chamber.

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