Heat utilization device for granulator

Abstract

The utility model provides a heat utilization device for a granulator, which comprises the granulator and a heat utilization device, the heat utilization device comprises a hot air pipeline, and one end of the hot air pipeline extends into an inner cavity of a gear box and is positioned above the liquid level of lubricating oil; the feeder comprises a rotating shaft and a spiral blade arranged outside the rotating shaft, a heat conduction channel in the axial direction is formed in the rotating shaft, the other end of the hot air pipeline is rotationally connected with one end of the rotating shaft, and an inner channel of the hot air pipeline is communicated with the heat conduction channel of the rotating shaft. According to the utility model, the hot air pipeline is arranged to introduce heat generated by the gearbox into the feeder for heating raw materials, increasing the temperature of the raw materials and reducing the steam consumption in the subsequent hardening and tempering process, so that the energy consumption is reduced, and the production cost is reduced; moreover, the gears in the gear box rotate to promote hot air to be formed, flowing of the hot air is facilitated, a rotating shaft of the feeder is fully heated, heat of the gear box can be fully dissipated, and damage of high temperature to the gears and lubricating oil is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of granulators, in particular to a heat utilization device for a granulator. Background Art

[0002] With the increasing demand for energy efficiency and environmental protection in industrial production, fully utilizing existing energy and reducing energy consumption have become important directions for enterprise development. A pellet mill primarily consists of feeding, mixing, pelletizing, transmission, and lubrication systems. The gearbox (transmission case) generates a large amount of heat during operation. If this heat cannot be effectively dissipated, it will cause the internal temperature of the gearbox to rise, affecting its performance and lifespan.

[0003] Currently, the heat generated by the gearbox is often directly discharged, which not only wastes energy but also may have a certain impact on the environment. Therefore, this application considers recycling the heat generated by the gearbox to improve energy utilization efficiency and protect the environment. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a heat utilization device for a pelletizer, which is used to solve the problem in the prior art that the heat generated by the gear box is directly discharged, which wastes energy and pollutes the environment.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a heat utilization device for a granulator, comprising:

[0006] A granulator, comprising a feeder, a conditioner, a granulating device, a gear box and a motor connected in sequence, wherein the inner cavity of the gear box is filled with lubricating oil;

[0007] A heat utilization device, wherein the heat utilization device includes a hot air duct, one end of the hot air duct extends into the inner cavity of the gear box and is located above the lubricating oil level; the feeder includes a rotating shaft and a spiral blade arranged outside the rotating shaft, an axial heat conduction channel is opened in the rotating shaft, the other end of the hot air duct is rotatably connected to one end of the rotating shaft, and the internal channel of the hot air duct is connected to the heat conduction channel of the rotating shaft.

[0008] In one embodiment of the present invention, the hot air duct and the rotating shaft are rotatably connected via a bearing.

[0009] In one embodiment of the present invention, the outer wall of the hot air duct is covered with a thermal insulation layer.

[0010] In one embodiment of the present invention, the hot air duct is made of stainless steel.

[0011] In one embodiment of the present invention, a meshing large gear and small gear are installed in the gear box, the liquid level of the lubricating oil is lower than the center of the large gear, and the extending end of the hot air duct is higher than the center of the large gear.

[0012] In one embodiment of the present invention, the outlet of the feeder is connected to the feed port of the conditioner, the discharge port of the conditioner is connected to the inlet of the granulating device, and the hot air duct is connected to one end of the rotating shaft close to the conditioner.

[0013] In one embodiment of the present invention, a shock-absorbing plate is provided at the bottom of the pelletizer, and the motor and the gear box are fixed on the shock-absorbing plate.

[0014] As described above, the heat utilization device for a pelletizer of the present invention has the following beneficial effects: the present invention introduces the heat generated by the gear box into the feeder by arranging a hot air duct, which is used to heat the raw materials, increase the temperature of the raw materials, and reduce the amount of steam used in the subsequent tempering process, thereby reducing energy consumption and reducing production costs; and the rotation of the gears in the gear box can promote the formation of hot air, which is not only conducive to the flow of hot air, so that the rotating shaft of the feeder is fully heated, but also can fully dissipate heat from the gear box, reducing the damage of high temperature to the gears and lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a heat utilization device for a granulator disclosed in the utility model.

[0016] Figure 2 It is a side schematic diagram of a heat utilization device for a granulator disclosed in the utility model.

[0017] Figure 3 This is a schematic top view of a heat utilization device for a granulator disclosed in the utility model.

[0018] Figure 4 This is a schematic structural diagram of the gearbox disclosed in the present utility model.

[0019] Component number description

[0020] 1. Feeder; 11. Rotating shaft; 111. Heat conduction channel; 12. Spiral blade; 2. Conditioner; 3. Granulating device; 4. Gearbox; 41. Lubricating oil; 42. Large gear; 43. Small gear; 5. Motor; 6. Shock absorber plate; 7. Hot air duct; 8. Bearing. DETAILED DESCRIPTION

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0022] See also Figures 1 to 4 The utility model provides a heat utilization device for a pelletizer, comprising a pelletizer and a heat utilization device, wherein the pelletizer comprises a feeder 1, a conditioner 2, a pelletizing device 3, a gear box 4 and a motor 5 connected in sequence, and the inner cavity of the gear box 4 is filled with lubricating oil 41; wherein the heat utilization device comprises a hot air duct 7, one end of the hot air duct 7 extends into the inner cavity of the gear box 4 and is located above the liquid level of the lubricating oil 41; the feeder 1 comprises a rotating shaft 11 and a spiral blade 12 arranged outside the rotating shaft 11, an axial heat conduction channel 111 is opened in the rotating shaft 11, the other end of the hot air duct 7 is rotatably connected to one end of the rotating shaft 11, and the internal channel of the hot air duct 7 is communicated with the heat conduction channel 111 of the rotating shaft 11.

[0023] The present application introduces the heat generated by the gear box 4 into the feeder 1 through the hot air duct 7, which is used to heat the raw materials, increase the temperature of the raw materials, and reduce the amount of steam used in the subsequent tempering process, thereby reducing energy consumption and lowering production costs; and the rotation of the gears in the gear box 4 can promote the formation of hot air, which is not only conducive to the flow of hot air, so that the rotating shaft 11 of the feeder 1 is fully heated, but also can fully dissipate heat from the gear box 4, reducing the damage of high temperature to the gears and lubricating oil.

[0024] refer to Figure 2 The hot air duct 7 and the rotating shaft 11 are rotatably connected via a bearing 8. When in use, the hot air duct 7 is fixed to one side of the feeder 1, and the rotating shaft 11 is docked with the hot air duct 7 and rotates relative to the hot air duct 7.

[0025] To prevent heat loss in the hot air duct 7 during transmission, the outer wall of the hot air duct 7 is coated with an insulation layer. The hot air duct 7 is made of stainless steel, and the rotating shaft 11 and the spiral blades 12 are also made of stainless steel to accelerate heat transfer.

[0026] refer to Figure 4 The gear box 4 is equipped with a meshing large gear 42 and a small gear 43. The liquid level of the lubricating oil 41 is lower than the center of the large gear 42, and the extending end of the hot air duct 7 is higher than the center of the large gear 42, so that there is a height difference between the air inlet of the hot air duct 7 and the liquid level of the lubricating oil 41, which facilitates the formation of hot air in the inner cavity of the gear box 4.

[0027] In this embodiment, the outlet of the feeder 1 is connected to the feed port of the conditioner 2, the discharge port of the conditioner 2 is connected to the inlet of the granulating device 3, and the hot air duct 7 is connected to the end of the rotating shaft 11 close to the conditioner 2, which can shorten the length of the hot air duct 7 and reduce heat loss during transmission.

[0028] In this embodiment, a shock-absorbing plate is provided at the bottom of the pelletizer, and the motor and the gear box are fixed on the shock-absorbing plate.

[0029] Energy analysis:

[0030] In this solution, the gearbox operates at 355kW. The gearbox is a single-stage transmission structure with a transmission efficiency of 98.5%. Based on the definition of thermal power, the gearbox's thermal power P = 5.3kW. After one hour of operation, the heat generated is Q = 5.3 × 1000 × 1 × 3600 = 19,080,000J.

[0031] In this solution, the specific heat capacity of the lubricating oil is 2000 J / kg·°C, and the mass of the lubricating oil in the gearbox is 115 kg. Use the following formula to calculate the energy required for the lubricating oil to absorb heat:

[0032] ΔQ=m×Cp×ΔT

[0033] in,

[0034] ΔQ is the required heat (J)

[0035] m is the mass of lubricating oil (kg)

[0036] Cp is the specific heat capacity of the lubricating oil (J / kg·℃)

[0037] ΔT is the temperature change of the lubricating oil (K)

[0038] We obtain: ΔQ = 115 kg × 2000 J / kg·°C × 20 K = 4,600,000 J.

[0039] In practical applications, heat transfer will not be completely efficient, and some heat will be lost in the form of radiation or convection. An efficiency factor is needed to take these losses into account, and the reference heat transfer efficiency is 0.8

[0040] Therefore, the actual heat transferred to the hot air is:

[0041] ActualΔQ=(19,080,000-4,600,000)×0.8=11,584,000J

[0042] The pipe material is 304 stainless steel with a specific heat capacity of 500 (J / kg·℃).

[0043] Then, the temperature rise (ΔT) of the pipe can be calculated by the following formula:

[0044] ΔT=(η×Q) / (m×c)

[0045] In this embodiment,

[0046] The heat capacity Q of the hot air is 11,584,000 J, the thermal efficiency η is 0.8, the mass m of the pipeline is 500 kg, and the specific heat capacity c is 500 J / kg·℃.

[0047] Then, ΔT = (0.8 × 11,584,000) / (500 × 500) = 37°C

[0048] This means that the temperature of the hot air duct will rise by 37° C., which shows that the heat utilization device of the present application has great practical significance and economic benefits.

[0049] In summary, the present invention, through the provision of a hot air duct, directs heat generated by the gearbox into the feeder for heating the raw materials, raising their temperature and reducing steam usage in the subsequent conditioning process, thereby reducing energy consumption and lowering production costs. Furthermore, the rotation of the gears within the gearbox promotes the formation of hot air, which not only facilitates the flow of hot air, thereby fully heating the feeder's rotating shaft, but also effectively dissipates heat from the gearbox, reducing damage to the gears and lubricating oil caused by high temperatures. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0050] Among them, the terms such as "upper", "lower", "left", "right", "front", "back", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any equivalent modifications or variations made by persons skilled in the art without departing from the spirit and technical concepts disclosed herein shall be encompassed by the claims of the present invention.

Claims

1. A heat utilization device for a granulator, characterized in that: include: A granulator, comprising a feeder, a conditioner, a granulating device, a gear box and a motor connected in sequence, wherein the inner cavity of the gear box is filled with lubricating oil; A heat utilization device, wherein the heat utilization device includes a hot air duct, one end of the hot air duct extends into the inner cavity of the gear box and is located above the lubricating oil level; the feeder includes a rotating shaft and a spiral blade arranged outside the rotating shaft, an axial heat conduction channel is opened in the rotating shaft, the other end of the hot air duct is rotatably connected to one end of the rotating shaft, and the internal channel of the hot air duct is connected to the heat conduction channel of the rotating shaft.

2. A heat utilization device for a granulator according to claim 1, characterized in that: The hot air duct and the rotating shaft are rotatably connected via a bearing.

3. A heat utilization device for a granulator according to claim 1, characterized in that: The outer wall of the hot air duct is covered with a heat insulation layer.

4. A heat utilization device for a granulator according to claim 1, characterized in that: The hot air duct is made of stainless steel.

5. A heat utilization device for a granulator according to claim 1, characterized in that: A meshing large gear and small gear are installed in the gear box, the liquid level of the lubricating oil is lower than the center of the large gear, and the extending end of the hot air duct is higher than the center of the large gear.

6. A heat utilization device for a granulator according to claim 1, characterized in that: The outlet of the feeder is connected to the feed port of the conditioner, the discharge port of the conditioner is connected to the inlet of the granulating device, and the hot air duct is connected to one end of the rotating shaft close to the conditioner.

7. A heat utilization device for a granulator according to any one of claims 1 to 6, characterized in that: A shock-absorbing plate is provided at the bottom of the granulator, and the motor and the gear box are fixed on the shock-absorbing plate.

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