Drum-type dryer
By using the inner cylinder to heat the exhaust gas and then heat the outer cylinder in a drum dryer, the problem of insufficient heat energy utilization is solved, efficient sand drying and exhaust gas purification is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422071962.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In the existing sand drying system, the thermal energy utilization is insufficient, resulting in low drying efficiency and high cost.
A drum dryer is designed. The hot air discharged from the hot air from the hot air furnace is used to heat the inner cylinder first, and then the exhaust gas returns to the outer cylinder through the pipe for secondary heating of the material, and filter it with a dust collector to make full use of the heat energy and purify the exhaust gas.
It improves the thermal energy utilization rate, improves the sand drying efficiency, reduces production costs, and reduces exhaust gas particle pollution.
Smart Images
Figure CN223204657U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of drying equipment, in particular to a drum type drying machine. Background Art
[0002] During the sand production process, wet materials need to be dried. In the existing technology, the wet materials are placed in a hopper, and a screw conveyor at the bottom of the hopper conveys the wet materials to a drum dryer. One end of the drum of the dryer is connected to a hot air furnace, and the hot air from the hot air furnace directly enters the dryer and comes into contact with the rolling sand for drying; the dried sand is then discharged from the dryer outlet. The existing sand processing wet material drying system does not fully utilize the heat energy of the hot air furnace, which reduces the sand drying efficiency. Utility Model Content
[0003] In view of the above problems, the utility model provides a drum dryer, which can improve the thermal energy utilization rate of the dryer and achieve good energy-saving effect by making full use of waste heat to dry granular wet materials.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] A drum dryer comprises a support base, on which a rotatable outer cylinder is provided; an inner cylinder is coaxially provided inside the outer cylinder, and an interlayer cavity between the outer cylinder and the inner cylinder is used for drying materials; the input end of the inner cylinder is connected to a hot air furnace, and the output end is connected to an exhaust gas pipe via a rotary joint; the exhaust gas pipe is directly or indirectly connected to the input end of the outer cylinder via a pipe; the inner wall of the outer cylinder is distributed with conveying blades; the outer wall of the inner cylinder is provided with axially mounted heat sinks; the input end of the outer cylinder is connected to a feed inlet, and the output end is connected to a discharge outlet.
[0006] Compared with the prior art, the beneficial effects of the present invention are:
[0007] The hot air from the hot blast furnace enters the inner drum of the dryer, heating it. The exhaust gas returns to the outer drum of the dryer through a pipe, directly heating the material inside. The material rolling in the outer drum mixes with the exhaust gas to achieve a certain degree of sedimentation and purification of the exhaust gas. The hot air from the hot blast furnace is fully utilized to dry the sand, improving the efficiency of heat energy utilization, improving sand drying efficiency, and reducing production costs.
[0008] As a further improvement of the above solution, the exhaust gas duct is connected to the dust collector inlet, and the dust collector outlet is connected to the first fixed cylinder through a duct, and a fan is provided on the duct.
[0009] The technical effect of the above improvement is: the dust collector is used to filter and purify the exhaust gas once, so that the particulate matter in the exhaust gas entering the dryer is reduced, and excessive exhaust gas particles are prevented from contaminating the sand.
[0010] As a further improvement of the above solution, a driving wheel is provided on the support seat, and the driving wheel is connected to the driving motor through a chain or a belt; the outer cylinder is provided on the driving wheel and is driven to rotate by the driving wheel.
[0011] The technical effect of the above improvement is: the support seat is used to install the driving wheel to support the outer cylinder. The driving wheels are arranged in two groups, two in each group, located at both ends of the outer cylinder to support the outer cylinder; the outer wall of the outer cylinder has a track ring or gear ring that cooperates with the driving wheel; the driving wheel is driven to rotate by the driving motor, and the driving wheel directly drives the outer cylinder to rotate. The rotation of the outer cylinder can drive the sand in the outer cylinder to roll and move forward.
[0012] As a further improvement of the above scheme, the two ends of the outer cylinder are respectively arranged in the first fixed cylinder and the second fixed cylinder; the first fixed cylinder and the second fixed cylinder are installed on the support seat; a feed port is provided above the first fixed cylinder; a discharge port is provided at the bottom or end of the second fixed cylinder; and an air outlet is provided above the second fixed cylinder.
[0013] The technical effects of the above improvements are as follows: the first fixed cylinder constitutes the feed end of the outer cylinder, and the second fixed cylinder constitutes the discharge end of the outer cylinder; the material enters the feed end from the feed port and then falls into the outer cylinder for rotation; the material moves from the end of the outer cylinder to the bottom of the second fixed cylinder and falls out from the discharge port; the moisture and excess exhaust generated by drying the sand in the outer cylinder are discharged from the outlet for heat recovery or purification treatment.
[0014] As a further improvement of the above solution, an inclined plate is provided in the first fixed cylinder to guide the sand coming in from the feed port so that the sand falls into the outer cylinder.
[0015] The technical effect of the above improvement is that the inclined plate can prevent the sand entering the feed port from falling on the bottom surface of the first fixed cylinder and being unable to enter the outer cylinder.
[0016] As a further improvement of the above solution, spiral blades are provided in the inner cylinder.
[0017] The technical effect of the above improvement is that the spiral blades can increase the residence time of the hot air in the inner tube, and at the same time the spiral blades can improve the absorption effect of heat energy and transfer it to the outer wall of the inner tube, thereby improving the heat utilization efficiency.
[0018] As a further improvement of the above solution, the pitch of the spiral blade gradually increases from the input end to the output end of the inner cylinder.
[0019] As a further improvement of the above solution, the inner wall of the outer cylinder is provided with a heat-insulating coating, which can be made of nano-ceramic hollow particles. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the dryer structure.
[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the dryer end face.
[0022] In the figure: 7, hot air furnace; 8, dryer; 41, dust collector; 81, outer cylinder; 82, conveying blade; 83, heat sink; 84, inner cylinder; 85, spiral blade; 86, discharge port; 87, feed port; 88, drive wheel; 89, drive motor; 90, support base; 91, first fixed cylinder; 92, second fixed cylinder; 93, exhaust pipe. DETAILED DESCRIPTION
[0023] In order to enable those skilled in the art to better understand the technical solution, the present invention is described in detail below in conjunction with the embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.
[0024] like Figure 1-2 As shown, the specific scheme of this embodiment is: a drum dryer, including a support base 90, on which a rotatable outer cylinder 81 is provided; an inner cylinder 84 is coaxially provided inside the outer cylinder 81, and the interlayer cavity between the outer cylinder 81 and the inner cylinder 84 is used for drying materials; the input end of the inner cylinder 84 is connected to the hot air furnace 7, and the output end is connected to the exhaust pipe 93 through a rotary joint; the exhaust pipe 93 is directly or indirectly connected to the input end of the outer cylinder 81 through a pipe; the inner wall of the outer cylinder 81 is distributed with conveying blades 82; the outer wall of the inner cylinder 84 is provided with axially installed heat sinks 83; the input end of the outer cylinder 81 is connected to the feed port 87, and the output end is connected to the discharge port 86.
[0025] Specifically, the dryer 8 also includes a support base 90, on which a driving wheel 88 is provided, and the driving wheel 88 is connected to the driving motor 89 through a chain or belt; the driving wheel 88 is provided with two groups, two in each group, and the two groups of driving wheels 88 respectively support the two ends of the outer cylinder 81; a ring track or a gear ring is provided on the outer wall of the outer cylinder 81 to cooperate with the driving wheel 88; the outer cylinder 81 is driven to rotate by the driving wheel 88, and the inner cylinder 84 and the outer cylinder 81 can be fixed to each other to form synchronous rotation. At this time, the inner cylinder 84 and the outer cylinder 81 are connected to each other through an internal connecting rod, and the two ends of the inner cylinder 84 are connected to other pipes through a rotary joint; if the outer cylinder 81 and the inner cylinder 84 are not connected to each other, only the outer cylinder 81 rotates, and the inner cylinder 84 does not rotate. In this case, there is no need to use a rotary joint; one end of the inner cylinder 84 is connected to the hot air furnace 7, and the other end is connected to a pipe for discharging exhaust gas;
[0026] The purpose of the inner cylinder 84 is to generate heat. A spiral blade 85 may be designed inside the inner cylinder 84 to improve the heat absorption effect of the inner cylinder 84 on the hot air. The pitch of the spiral blade 85 gradually increases from the input end to the output end of the inner cylinder 84.
[0027] The inner wall of the outer cylinder 81 is provided with a thermal insulation coating to improve the thermal insulation effect. The thermal insulation coating can be made of nano-ceramic particles.
[0028] The outer wall of the inner cylinder 84 is provided with heat dissipation fins 83 to improve the heat dissipation effect of the inner cylinder 84; the interlayer cavity between the outer cylinder 81 and the inner cylinder 84 is used for drying the wet sand material; and the inner wall of the outer cylinder 81 is evenly distributed with conveying blades 82.
[0029] As the outer cylinder 81 rotates, the sand flows inside the outer cylinder 81 and is transported forward by the conveying blades 82; at the same time, the conveying blades 82 also drive the sand to move above the outer cylinder 81 as the outer cylinder 81 rotates and then falls onto the inner cylinder 84. The heat sink 83 on the outer wall of the inner cylinder 84 can block the sand, thereby increasing the residence time of the sand on the inner cylinder 84 and improving the drying effect of the sand.
[0030] The outer cylinder 81 is rotatably connected to a first fixed cylinder 91 and a second fixed cylinder 92 at both ends; the fixed cylinders are mounted on the support base 90 and do not rotate. A feed port 87 is provided above the first fixed cylinder 91, and a discharge port 86 is provided at the bottom or end of the second fixed cylinder 92. An air outlet is provided above the second fixed cylinder 92. An inclined plate can be provided inside the first fixed cylinder 91 to guide the sand entering from the feed port 87 so that the sand falls into the outer cylinder 81.
[0031] Sand transportation process:
[0032] The sand enters the outer cylinder 81 of the dryer 8 from the feed port 87. When the outer cylinder 81 rotates, the sand is rolled and moved forward. The rolled sand falls onto the inner cylinder 84. The inner cylinder 84 emits heat to heat and dry the sand. The heat sink 83 on the outer wall of the inner cylinder 84 improves the drying efficiency.
[0033] Hot air delivery process:
[0034] The hot air from the hot air furnace 7 enters the inner drum 84 of the dryer 8, where it heats the inner drum 84. It then passes through a pipe into the dust collector 41 for primary filtration. It then returns through the pipe to the outer drum 81 of the dryer 8, where it heats the sand inside. The sand also absorbs and purifies the exhaust gas. A fan can be installed in the pipe to facilitate the flow of the hot air.
[0035] It should be noted that, in this article, the terms include, contain or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used herein to illustrate the principles and implementation methods of the technical solution of the present utility model. The above examples are only used to help understand the method of the present utility model and its core idea. The above is only a preferred embodiment of the present utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should all be regarded as the scope of protection of the present utility model.
Claims
1. A drum drying machine, comprising a support base (90), characterized in that: A rotatable outer cylinder (81) is provided on the support seat (90); an inner cylinder (84) is coaxially provided inside the outer cylinder (81); an interlayer cavity between the outer cylinder (81) and the inner cylinder (84) is used for drying materials; the input end of the inner cylinder (84) is connected to the hot air furnace (7), and the output end is connected to the tail gas pipeline (93) through a rotary joint; the tail gas pipeline (93) is directly or indirectly connected to the input end of the outer cylinder (81) through a pipeline; conveying blades (82) are distributed on the inner wall of the outer cylinder (81); the outer wall of the inner cylinder (84) is provided with axially installed heat sinks (83); the input end of the outer cylinder (81) is connected to the feed port (87), and the output end is connected to the discharge port (86).
2. A drum dryer according to claim 1, characterized in that: The two ends of the outer cylinder (81) are respectively arranged in the first fixed cylinder (91) and the second fixed cylinder (92); the first fixed cylinder (91) and the second fixed cylinder (92) are installed on the support seat (90); a feed port (87) is provided above the first fixed cylinder (91); a discharge port (86) is provided at the bottom or end of the second fixed cylinder (92); and an air outlet is provided above the second fixed cylinder (92).
3. A drum drying machine according to claim 2, characterized in that: The tail gas pipeline (93) is connected to the inlet of the dust collector (41), and the outlet of the dust collector (41) is connected to the first fixed cylinder (91) through a pipeline, and a fan is provided on the pipeline.
4. A drum drying machine according to claim 2, characterized in that: An inclined plate is provided in the first fixed cylinder (91) for guiding the sand coming in from the feed port (87) so that the sand falls into the outer cylinder (81).
5. The drum drying machine according to claim 1, characterized in that: The support seat (90) is provided with a driving wheel (88), and the driving wheel (88) is connected to a driving motor (89) through a chain or a belt; the outer cylinder (81) is provided on the driving wheel (88) and is driven to rotate by the driving wheel (88).
6. The drum drying machine according to claim 1, characterized in that: The inner cylinder (84) is provided with a spiral blade (85).
7. The drum drying machine according to claim 6, characterized in that: The pitch of the spiral blade (85) gradually increases from the input end to the output end of the inner cylinder (84).
8. The drum drying machine according to claim 1, characterized in that: The inner wall of the outer cylinder (81) is provided with a heat-insulating coating.