An energy-saving blue charcoal drying system

Abstract

The present invention discloses an energy-saving blue charcoal drying system, which includes an energy-saving rotary drying kiln. A blue charcoal feeding pipe is provided on the energy-saving rotary drying kiln, the energy-saving rotary drying kiln is connected to the hot air duct of the hot blast furnace, the smoke exhaust duct of the energy-saving rotary drying kiln is connected to the cyclone dust collector through a first ash conveying duct, and a 360-degree zigzag flow channel is provided in the energy-saving rotary drying kiln. The beneficial effects of the present invention are as follows: the present invention designs an energy-saving rotary drying kiln, and a 360-degree zigzag flow channel is designed in the rotary drying kiln, so that the hot air and the blue charcoal flow in the 360-degree zigzag flow channel in reverse direction for heat exchange, which greatly increases the heat exchange time and the heat exchange path, improves the heat exchange efficiency, and saves heat energy.

Description

Technical Field

[0001] The present invention relates to the technical field of blue charcoal drying equipment, and in particular to an energy-saving blue charcoal drying system. Background Art

[0002] The semi-coke raw materials used by calcium carbide manufacturers need to be dried in a drying device before entering the furnace to reduce the semi-coke's moisture content. Traditional semi-coke drying systems mainly include boiling furnaces and rotary kilns. The boiling furnace uses carbon powder or pulverized coal as fuel. The specific drying process is as follows: river sand is added to the boiling furnace as bedding. A blower blows strong air through the wind cap to fluidize the bedding. Purchased or self-produced carbon powder is added to the fluidized bedding in the boiling furnace at a given feed rate controlled by a disc feeder and burned. The resulting high-temperature flue gas is sucked into the rotary dryer by negative pressure. The wet carbon material is added to the dryer through a feed pipe and directly contacts the hot flue gas for heat exchange. The carbon material is continuously moved forward in the dryer by the action of the lifting plate and the guide plate until it is discharged from the dryer at the discharge port. It is then sent to the silo for storage by a heat-resistant belt conveyor. The wet and high-temperature flue gas is dusted and settled by a bag filter. The dust ash is stored in the ash silo. The flue gas that meets the emission requirements after filtering is discharged into the atmosphere through the chimney by the induced draft fan.

[0003] There is obvious energy waste in the above-mentioned drying process. First, the carbon content of the dust ash is relatively high, usually as high as 20% or more, and the combustion is not complete; second, the temperature of the discharged flue gas is still relatively high, and the waste heat of the flue gas is not fully recovered and reused. Third, the main structure of the traditional rotary drying kiln includes a rotating drum. The lifting plate in the drum repeatedly lifts the lignite in the drum to form a material curtain, which is then heat-exchanged and dried with the flue gas. The problem with this type of dryer is that the lignite stays in the drum for a short time and it is difficult to fully exchange heat with the high-temperature flue gas. The flue gas discharged from the drum still has a very high temperature, and this part of the high-temperature flue gas directly enters the subsequent dust removal and purification system, resulting in high heat loss and waste of resources; fourth, the drying drum in the existing technology is a steel structure with fast heat dissipation, and also has high heat loss, which needs to be improved urgently. Summary of the Invention

[0004] (1) Technical problems solved

[0005] The purpose of the present invention is to provide an energy-saving blue charcoal drying system to solve the technical problems of blue charcoal drying systems in the prior art, such as insufficient thermal energy utilization, high heat loss and waste of resources.

[0006] (2) Technical solution

[0007] The present invention provides an energy-saving semi-coke drying system, which includes an energy-saving rotary drying kiln, a semi-coke feeding pipe is provided on the energy-saving rotary drying kiln, the energy-saving rotary drying kiln is connected to the hot air duct of the hot blast furnace, the exhaust pipe of the energy-saving rotary drying kiln is connected to the cyclone dust collector through the first ash conveying pipe, the two discharge ports of the cyclone dust collector are respectively connected to the settler and the second ash conveying pipe, an induced draft fan is installed on the second ash conveying pipe, and the discharge port of the second ash conveying pipe is connected to the bag dust collector. The bag-type dust collector and the cyclone dust collector are connected to the ash hopper, the dust in the ash hopper is transported to the combustion chamber of the hot blast furnace through a belt conveyor, the tail gas duct of the hot blast furnace is connected to the first ash conveying duct, the air outlet of the bag-type dust collector is connected to the hot air duct through an air supply duct, a blower is installed on the air supply duct, a 360° zigzag flow channel is provided in the energy-saving rotary drying kiln, and the hot air and the semi-coke flow in opposite directions in the 360° zigzag flow channel.

[0008] Furthermore, an insulation cylinder assembly is fixedly installed outside the energy-saving rotary drying kiln, and an insulation ring cavity is provided inside the insulation cylinder assembly. The insulation ring cavity is connected to the 360° folded line flow channel and the smoke exhaust pipe of the energy-saving rotary drying kiln. The insulation cylinder assembly is placed on the roller support assembly, and the insulation cylinder assembly is transmission-connected to the rotary drive assembly.

[0009] Furthermore, the energy-saving rotary drying kiln includes an inner cylinder, a spiral conveying blade is connected to the outside of the inner cylinder, the outer edge of the spiral conveying blade is connected to the outer cylinder, a sealing disk is fixedly covered on one end of the outer cylinder, and an annular cavity with an open outer end is formed between the inner cylinder and the outer cylinder, and a feeding port is opened at the inner end of the inner cylinder. The annular cavity, the feeding port and the inner cavity of the inner cylinder form the 360° fold line flow channel, the annular cavity is connected to the blue charcoal feeding pipe, and the inner cylinder is connected to the hot air duct.

[0010] Furthermore, the inner cylinder is in a tapered shape with a small inner end diameter and a large outer end diameter.

[0011] Furthermore, a material blocking ring is installed on the outer end of the outer wall of the inner cylinder and the outer end of the inner wall of the outer cylinder.

[0012] Furthermore, the insulation cylinder assembly includes a cylindrical outer shield, which is fixedly mounted on the outer cylinder to form the insulation ring cavity. A plurality of suction holes are opened at the outer end of the inner wall of the outer cylinder, and the suction holes are connected to the insulation ring cavity.

[0013] Furthermore, a smoke collecting cavity is provided in the sealing disk, the smoke collecting cavity is communicated with the heat-insulating ring cavity, and the sealing disk is connected with the smoke exhaust pipe.

[0014] Furthermore, the roller support assembly includes a plurality of bases arranged along the length direction of the energy-saving rotary drying kiln, and two support rollers are rotatably connected to the bases, and the support rollers are in rolling contact with the insulation cylinder assembly.

[0015] Furthermore, the rotary drive assembly includes a ring gear, which is fixedly sleeved on the insulation cylinder assembly, the ring gear is engaged with a gear shaft, the gear shaft is rotationally connected to the frame, and the gear shaft is transmission-connected to the motor.

[0016] Preferably, a sampler is provided on the belt conveyor.

[0017] (3) Beneficial effects

[0018] Beneficial effects of the present invention: The present invention designs an energy-saving rotary drying kiln, and a 360° zigzag flow channel is designed in the rotary drying kiln, so that the hot air and the lignite flow in the 360° zigzag flow channel in reverse to exchange heat, which greatly increases the heat exchange time and heat exchange path, improves the heat exchange efficiency, and saves heat energy; the purified dust removal ash in the drying system is circulated and burned to reduce the carbon content in the dust removal ash, improves the combustion efficiency, and saves fuel; the flue gas discharged from the drying cylinder is re-discharged into the insulation ring cavity of the outer protective cover for purification and dust removal, forming a flue gas insulation layer outside the drying cylinder, reducing heat loss in the drying cylinder; the flue gas discharged from the insulation ring cavity enters the dust removal system together with the exhaust gas discharged from the hot blast furnace for purification, and is mixed with the hot air duct of the hot blast furnace again, making full use of the waste heat of the flue gas, comprehensively optimizing the configuration, and greatly saving heat energy, which is worthy of large-scale use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the drying system of the present invention;

[0020] Figure 2 A perspective view of the energy-saving rotary drying kiln of the present invention;

[0021] Figure 3 This is a cross-sectional view of the energy-saving rotary drying kiln of the present invention;

[0022] Figure 4 This is a right side view of the energy-saving rotary drying kiln of the present invention;

[0023] Figure 5 A perspective view of the inner cylinder of the present invention;

[0024] Figure 6 A perspective view of the outer shield of the present invention;

[0025] In the figure, there are energy-saving rotary drying kiln 1, inner cylinder 101, outer cylinder 102, spiral conveying blades 103, feeding port 104, hot air duct 105, semi-coke feeding pipe 106, 360° folded line flow channel 107, outer protective cover 108, insulation ring cavity 109, sealing disk 110, smoke collecting cavity 111, smoke exhaust duct 112, gear shaft 113, support roller 114, motor 115, base 116, suction through hole 117, ring cavity 118, material blocking ring piece 119, air supply duct 120, ring gear 121, hot air furnace 2, first ash conveying duct 3, cyclone dust collector 4, induced draft fan 5, bag dust collector 6, settler 7, ash hopper 8, sampler 9, blower 10, belt conveyor 11, and second ash conveying duct 12. DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figures 1 to 3 As shown, an energy-saving semi-coke drying system includes an energy-saving rotary drying kiln 1, a semi-coke feeding pipe 106 is provided on the energy-saving rotary drying kiln 1, the energy-saving rotary drying kiln 1 is connected to the hot air duct 105 of the hot blast furnace 2, the smoke exhaust duct 112 of the energy-saving rotary drying kiln 1 is connected to the cyclone dust collector 4 through the first ash conveying pipe 3, the two discharge ports of the cyclone dust collector 4 are respectively connected to the settler 7 and the second ash conveying pipe 12, an induced draft fan 5 is installed on the second ash conveying pipe 12, the discharge port of the second ash conveying pipe 12 is connected to the bag dust collector 6, the bag dust collector 6 and the discharge ports of the cyclone dust collector 4 are both connected to the ash hopper 8, and the dust collected in the ash hopper 8 is transported to the combustion chamber of the hot blast furnace 2 through the belt conveyor 11. The tail gas duct of the hot blast furnace 2 is connected to the first ash conveying duct 3, and the air outlet of the bag filter 6 is connected to the hot air duct 105 through the air supply duct 120. The air supply fan 10 is installed on the air supply duct 120. A 360° zigzag flow channel 107 is provided in the energy-saving rotary drying kiln 1, and the hot air and the lignite flow in the opposite directions in the 360° zigzag flow channel 107; an insulation cylinder assembly is fixedly installed outside the energy-saving rotary drying kiln 1, and an insulation ring cavity 109 is provided in the insulation cylinder assembly. The insulation ring cavity 109 is connected to the 360° zigzag flow channel 107 and the smoke exhaust duct 112 of the energy-saving rotary drying kiln 1, and the insulation cylinder assembly is placed on the roller support assembly, and the insulation cylinder assembly is transmission-connected to the rotary drive assembly.

[0028] like Figure 3 and Figure 5As shown, the energy-saving rotary drying kiln 1 includes an inner cylinder 101, a spiral conveying blade 103 is connected to the outside of the inner cylinder 101, the outer edge of the spiral conveying blade 103 is connected to the outer cylinder 102, and a sealing disk 110 is fixedly covered on one end of the outer cylinder 102. An annular cavity 118 with an outer end opening is formed between the inner cylinder 101 and the outer cylinder 102, and a material passage 104 is opened at the inner end of the inner cylinder 101. The annular cavity 118, the material passage 104, The inner cavity of the inner cylinder 101 forms the 360° zigzag flow channel 107, the annular cavity 118 is connected to the lignite feeding pipe 106, and the inner cylinder 101 is connected to the hot air duct 105; in order to improve the fluidity of the lignite, the inner cylinder 101 is a cone with a small inner end diameter and a large outer end diameter; in order to prevent the lignite from being scattered during the transportation process, a material blocking ring 119 is installed at the outer end of the outer wall of the inner cylinder 101 and the outer end of the inner wall of the outer cylinder 102.

[0029] like Figure 2 and Figure 4 As shown, the roller support assembly includes several bases 116 arranged along the length direction of the energy-saving rotary drying kiln 1, and two support rollers 114 are connected to the base 116 for rotation, and the support rollers 114 are in rolling contact with the insulation cylinder assembly; the rotary drive assembly includes a ring gear 121, and the ring gear 121 is fixedly sleeved on the insulation cylinder assembly, and the ring gear 121 is engaged with the gear shaft 113, and the gear shaft 113 is rotationally connected to the frame, and the gear shaft 113 is transmission connected to the motor 115.

[0030] Example 2

[0031] Example 2 provides a specific structure of the heat preservation cylinder assembly based on Example 1, such as Figure 3 and Figure 6 As shown, the insulation cylinder assembly includes a cylindrical outer protective cover 108, and the outer protective cover 108 is fixedly mounted on the outer cylinder 102 to form the insulation ring cavity 109. A plurality of suction holes 117 are opened at the outer end of the inner wall of the outer cylinder 102, and the suction holes 117 are connected with the insulation ring cavity 109; a smoke collecting chamber 111 is opened in the sealing disk 110, and the smoke collecting chamber 111 is connected with the insulation ring cavity 109, and the sealing disk 110 is connected with the smoke exhaust pipe 112; at the same time, in order to monitor the carbon content of the dust ash, a sampler 9 is provided on the belt conveyor 11, and sampling is carried out at equal time intervals. When the carbon content of the dust ash is lower than 10%, the ash discharge valve of the ash hopper 8 can be opened to discharge the ash.

[0032] When the drying system of the present invention is in operation, Figures 1 to 6As shown, the hot air from the hot blast furnace 2 enters the inner cylinder 101 of the energy-saving rotary drying kiln 1 through the hot air duct 105, and then flows through the feeding port 104, the annular cavity 118, the suction through hole 117, the heat preservation annular cavity 109, the smoke collecting cavity 111, and the smoke exhaust duct 112 in sequence before being discharged. At the same time, the semi-coke enters the annular cavity 118 through the semi-coke feeding pipe 106, and flows through the feeding port 104 and the inner cylinder 101 to exchange heat with the hot air in countercurrent, and is discharged after being dried. The hot air discharged from the smoke exhaust duct 112 is discharged together with the combustion gas discharged from the hot blast furnace 2. The tail gas enters the purification and dust removal system composed of the first ash conveying pipe 3, cyclone dust collector 4, induced draft fan 5, bag dust collector 6, settler 7, and ash hopper 8 for dust removal. The obtained dust ash is returned to the hot air furnace 2 for circulating combustion. At the same time, the hot air with residual heat after dust removal is mixed with the hot air pipe 105 and then enters the energy-saving rotary drying kiln 1 for reuse. During use, it is necessary to use the sampler 9 to take samples to detect the carbon content of the dust ash sample. When the carbon content is lower than 10%, the ash discharge valve of the ash hopper 8 is opened to discharge the ash.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving blue charcoal drying system, characterized by: The energy-saving rotary drying kiln (1) includes an energy-saving rotary drying kiln (1), a semi-coke feeding pipe (106) is provided on the energy-saving rotary drying kiln (1), the energy-saving rotary drying kiln (1) is connected to the hot air pipe (105) of the hot air furnace (2), the smoke exhaust pipe (112) of the energy-saving rotary drying kiln (1) is connected to the cyclone dust collector (4) through the first ash conveying pipe (3), the two discharge ports of the cyclone dust collector (4) are respectively connected to the settler (7) and the second ash conveying pipe (12), an induced draft fan (5) is installed on the second ash conveying pipe (12), the discharge port of the second ash conveying pipe (12) is connected to the bag dust collector (6), and the bag dust collector (6) is connected to the bag dust collector (6). The discharge ports of the dust collector (6) and the cyclone dust collector (4) are both connected to the ash hopper (8), and the dust collected in the ash hopper (8) is transported to the combustion chamber of the hot blast furnace (2) through a belt conveyor (11). The tail gas pipe of the hot blast furnace (2) is connected to the first ash conveying pipe (3). The air outlet of the bag dust collector (6) is connected to the hot air pipe (105) through an air supply pipe (120), and a blower (10) is installed on the air supply pipe (120). A 360° folded line flow channel (107) is provided in the energy-saving rotary drying kiln (1), and hot air and blue charcoal flow in opposite directions in the 360° folded line flow channel (107); A heat-insulating cylinder assembly is fixedly mounted outside the energy-saving rotary drying kiln (1), and a heat-insulating ring cavity (109) is provided inside the heat-insulating cylinder assembly. The heat-insulating ring cavity (109) is connected to the 360° folded-line flow channel (107) and the exhaust pipe (112) of the energy-saving rotary drying kiln (1). The heat-insulating cylinder assembly is placed on a roller support assembly, and the heat-insulating cylinder assembly is in transmission connection with a rotary drive assembly. The heat-insulating cylinder assembly includes a cylindrical outer protective cover (108), and the energy-saving rotary drying kiln (1) includes an inner cylinder (101) and an outer cylinder (102). The outer protective cover (108) is fixedly mounted on the outer cylinder (102) to form the heat-insulating ring cavity (109). A plurality of suction holes (117) are provided on the inner wall of one end of the outer cylinder (102), and the suction holes (117) are communicated with the heat-insulating ring cavity (109). A sealing disk (110) is fixedly covered on the other end of the outer cylinder (102), and a smoke collecting cavity (111) is provided in the sealing disk (110), and the smoke collecting cavity (111) is communicated with the heat-insulating ring cavity (109). The sealing disk (110) is connected to the smoke exhaust pipe (112).

2. The energy-saving blue charcoal drying system according to claim 1, characterized in that: A spiral conveying blade (103) is connected to the outside of the inner cylinder (101), and the outer edge of the spiral conveying blade (103) is connected to the outer cylinder (102). The sealing disk (110) is fixedly covered on one end of the outer cylinder (102). An annular cavity (118) with an outer end opening is formed between the inner cylinder (101) and the outer cylinder (102). A material passage (104) is provided at the inner end of the inner cylinder (101). The annular cavity (118), the material passage (104), and the inner cavity of the inner cylinder (101) form the 360° folded line flow channel (107). The annular cavity (118) is connected to the semi-coke feeding pipe (106), and the inner cylinder (101) is connected to the hot air duct (105).

3. The energy-saving blue charcoal drying system according to claim 2, characterized in that: The inner cylinder (101) is tapered with a small inner diameter and a large outer diameter.

4. The energy-saving blue charcoal drying system according to claim 2, characterized in that: A material blocking ring (119) is installed on the outer end of the outer wall of the inner cylinder (101) and the outer end of the inner wall of the outer cylinder (102).

5. The energy-saving blue charcoal drying system according to claim 2, characterized in that: The roller support assembly comprises a plurality of bases (116) arranged along the length direction of the energy-saving rotary drying kiln (1), two support rollers (114) being rotatably connected to the bases (116), and the support rollers (114) being in rolling contact with the heat-insulating cylinder assembly.

6. The energy-saving blue charcoal drying system according to claim 2, characterized in that: The rotary drive assembly comprises a ring gear (121), the ring gear (121) is fixedly sleeved on the heat-insulating cylinder assembly, the ring gear (121) is meshed with a gear shaft (113), the gear shaft (113) is rotationally connected to the frame, and the gear shaft (113) is transmission-connected to the motor (115).

7. An energy-saving blue charcoal drying system according to any one of claims 1 to 6, characterized in that: A sampler (9) is provided on the belt conveyor (11).

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