A drying kiln system for granulation of oil fracturing proppant

Abstract

This invention relates to the field of oil extraction technology, and more particularly to a drying kiln system for granulation of oil fracturing proppant. The granulation equipment has a feed belt equipped with a selector valve; a first conveyor device receives material from outlet one of the selector valve; a second conveyor device receives material from outlet two of the selector valve; the first conveyor device has multiple discharge valves, and a connecting belt at its end connects to a third conveyor device; a screening device receives and screens the material output from the first and third conveyor devices; a buffer bin receives the material output from the second conveyor device; the input end of the drying kiln receives the material output from the buffer bin; the third conveyor device is located at the output end of the drying kiln; and a control system is connected to each piece of equipment. Using this invention, the conveying route can be automatically allocated according to the specifications of the granulated semi-finished product, enabling switching between granulation starter, wet granules, and dried granules, improving drying uniformity, increasing screening efficiency, and reducing energy consumption.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a drying kiln system for granulation of oil fracturing proppant. Background Technology

[0002] In the production of fracturing proppant, the granulated semi-finished particles typically require drying to remove internal moisture and prevent cracking or bursting during subsequent calcination due to rapid moisture evaporation. Currently, the drying process mainly relies on the waste heat of rotary kilns for energy-saving treatment, using equipment such as rotary dryers or vertical drying towers. The dried particles are then sieved to ensure their particle size meets process requirements.

[0003] However, in existing technologies, all semi-finished granules after granulation must undergo drying, regardless of their particle size or intended use. This practice has many problems and shortcomings.

[0004] First, in the existing process, initiator particles (i.e., nucleus particles used to promote the subsequent granulation process) and large particles (particles with a diameter of more than 300 μm) do not need to be dried during the sieving process. However, the current process still forces them to be dried, which leads to energy waste and reduces production efficiency.

[0005] Secondly, the drying process of initiator particles and large particles not only increases energy consumption but may also adversely affect their physical properties. Due to the smaller specific surface area of ​​large particles, their moisture evaporation efficiency is lower during the drying process. Existing drying equipment usually adopts uniform drying conditions, which makes it difficult to meet the drying requirements of particles of different sizes, resulting in uneven drying and affecting product quality.

[0006] In addition, existing drying equipment has a single function, only capable of drying all granulated semi-finished products. It cannot be flexibly configured and adapted according to different needs of the granulation process (such as initiator preparation, direct screening of large particles, etc.), which limits the multifunctionality and flexibility of the production line.

[0007] Meanwhile, in existing drying processes, particles of different sizes are mixed during the drying process, making it impossible to achieve precise control of the drying process, affecting the uniformity of drying, and further reducing the quality of the finished particles and the screening efficiency.

[0008] Therefore, there is an urgent need for a drying system that can automatically allocate conveying routes and realize particle diversion processing according to the specifications and uses of granulated semi-finished products, so as to avoid unnecessary drying of initiator particles and large particles that do not need to be dried, thereby effectively reducing energy consumption, improving production efficiency, and improving drying uniformity and screening efficiency. Summary of the Invention

[0009] In view of this, the present invention provides a drying kiln system for granulation of oil fracturing proppant, the main purpose of which is to automatically allocate the conveying route according to the specifications and functions of the granulated semi-finished product, improve the uniformity of drying, improve screening efficiency, and reduce energy consumption.

[0010] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0011] Embodiments of the present invention provide a drying kiln system for granulation of proppant in oil fracturing, comprising: a feeding belt for granulation equipment, a first conveyor device, a second conveyor device, a screening device, a buffer bin, a pre-filled material bin, a semi-finished material bin, a drying kiln, a third conveyor device, and a control system; a single production line can be expanded to two or more lines;

[0012] The feeding belt of the granulation equipment is used to transport the granules produced by the granulation equipment; the feeding belt of the granulation equipment is connected in parallel with multiple granulation equipment to uniformly transport the produced granules;

[0013] The feeding belt of the granulation equipment is equipped with a selection valve;

[0014] The conveying device is used to receive the material output from the outlet of the selector valve;

[0015] The second conveying device is used to receive the material output from the outlet of the second selector valve;

[0016] The conveying device is equipped with a discharge valve; there are multiple discharge valves; the multiple discharge valves correspond to different lead discharge channels of the conveying device.

[0017] The connecting belt at the end of the first conveyor is connected to the third conveyor to transport large particles that do not need to be dried to the third conveyor. The screening equipment is used to receive and screen the large particles that do not need to be dried output from the first conveyor.

[0018] The buffer compartment is used to receive the materials output by the second conveying device;

[0019] The input end of the drying kiln is used to receive the material output from the buffer silo;

[0020] The conveying device three is installed at the output end of the drying kiln and is used to receive the material dried by the drying kiln and convey it to the screening equipment.

[0021] The initiator chamber is used to receive the initiator material output from the discharge channel of the conveying device one;

[0022] The semi-finished product silo is used to receive the material output from the screening equipment;

[0023] The control system is connected to the granulation equipment, the selector valve, the drying kiln, the first conveyor device, the second conveyor device, the third conveyor device, and the discharge valve, respectively, and is used to control the granulation equipment, the selector valve, the drying kiln, the first conveyor device, the second conveyor device, the third conveyor device, and the discharge valve;

[0024] The production line consisting of the feeding belt of the granulation equipment, the first conveyor device, and the second conveyor device can be one, two, or more.

[0025] Furthermore, the drying kiln is a rotary drum drying kiln; the drying kiln is connected to an exhaust fan;

[0026] The material in the buffer bin is conveyed to the input end of the drying kiln via a conveying device.

[0027] The discharge port of the fourth conveying device is equipped with a feeding slowing structure; the feeding slowing structure is a conical slope type.

[0028] Furthermore, the drying kiln is equipped with lifting plates; multiple lifting plates are arranged in a ring within the drying kiln.

[0029] The lifting plate has an angle between its end and root; the end and root of the lifting plate are connected by an arc; the root of the lifting plate is vertically fixed to the inner wall of the drying kiln.

[0030] The tilt angles are 50° and 70°.

[0031] Furthermore, the lifting plates with an inclination angle of 50° and the lifting plates with an inclination angle of 70° are alternately distributed along the axial direction of the drying kiln.

[0032] Furthermore, the screening equipment has multiple output ports for outputting particles of different sizes; the initiator chamber is also connected to the small particle output port of the screening equipment.

[0033] By employing the above technical solution, the drying kiln system for oil fracturing proppant granulation of the present invention has at least the following advantages:

[0034] It can automatically allocate conveying routes according to the specifications and functions of granulated semi-finished products, improve drying uniformity, increase screening efficiency, and reduce energy consumption.

[0035] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0036] Figure 1A schematic diagram of a drying kiln system for granulation of oil fracturing proppant provided in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram illustrating the relationship between the discharge channel of the feed belt of the granulation equipment, the selector valve, and the conveying device 1 and conveying device 2 in a drying kiln system for granulation of oil fracturing proppant, provided in an embodiment of the present invention.

[0038] Figure 3 A schematic diagram of a conveying device 2 and a buffer bin in a drying kiln system for granulation of oil fracturing proppant provided in an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the drying kiln body and lifting plates in a drying kiln system for granulation of oil fracturing proppant provided in an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of a lifting plate in a drying kiln system for granulation of oil fracturing proppant provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of a conveying device three in a drying kiln system for granulation of oil fracturing proppant, provided in an embodiment of the present invention.

[0042] As shown in the figure:

[0043] 1 is the feeding belt of the granulation equipment; 2 is the first conveyor device; 3 is the second conveyor device; 3-1 is the feeding slowdown structure; 4 is the buffer bin; 5 is the drying kiln; 5-1 is the cylinder; 5-2 is the lifting plate; 5-21 is the root; 5-22 is the end; 6 is the third conveyor device; 6-1 is the vertical closed elevator; 6-2 is the primary main belt conveyor; 6-3 is the main belt conveyor support frame; 6-4 is the multi-production line feeding switching valve; 6-5 is the feeding valve belt; 7 is the inlet bin; 8 is the selector valve; 9 is the feeding valve; 10 is the fourth conveyor device; 11 is the semi-finished product bin; 12 is the connecting belt. Detailed Implementation

[0044] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0045] like Figures 1 to 6As shown, an embodiment of the present invention provides a drying kiln 5 system for granulation of oil fracturing proppant, comprising: a granulation equipment feeding belt 1, a first conveyor device 2, a second conveyor device 3, a buffer bin 4, a starter bin 7, a semi-finished product bin 11, a drying kiln 5, a third conveyor device 6, and a control system; the granulation equipment feeding belt 1 can be multiple depending on the number of production lines; multiple granulation equipment are connected in parallel to one granulation equipment feeding belt 1; the granulation equipment can be a disc granulator as in the prior art. A selection valve 8 is provided on the discharge channel of the granulation equipment feeding belt 1; the input port of the selection valve 8 is connected to the discharge channel; the selection valve 8 has one input port and two outlets; the selection valve 8 is controlled by a pneumatic or electric control system, which can be operated remotely and can also be interlocked with the granulation equipment for control, selecting different outlets for flow according to changes in the granulation specifications and granulation functions of the granulation equipment. Changes in the granulation functions of the granulation equipment can be controlled by the control system.

[0046] Conveying device 2 is used to receive the material output from outlet 1 of selector valve 8; conveying device 2 is preferably a belt conveyor for convenient conveying of granular materials; conveying device 3 is used to receive the material output from outlet 2 of selector valve 8; conveying device 3 is preferably a belt conveyor for convenient conveying of granular materials; the belt conveyor can be a belt conveyor of existing technology. Conveying device 2 is equipped with discharge valves 9 for selectively discharging materials such as feedstock or wet materials that do not require drying; there are multiple discharge valves 9; multiple discharge valves 9 correspond to different discharge channels of conveying device 2.

[0047] The screening equipment is used to receive and screen the material output from the discharge valve 9 of the discharge channel of the conveying device 36;

[0048] The connecting belt 12 at the end of the conveyor device 12 is connected to the conveyor device 36 to transport large particles that do not need to be dried to the conveyor device 36. The screening equipment is used to receive and screen the large particles that do not need to be dried output from the conveyor device 12 and the material output from the discharge channel of the conveyor device 36. The screened particles enter the semi-finished product silo 11.

[0049] Multiple screening devices are used; each screening device corresponds to a discharge valve 9 in a multiple discharge channel, allowing for simultaneous screening and improving operational efficiency. The screening equipment utilizes existing technology.

[0050] The buffer bin 4 receives the material output from the conveying device 2 3; the input end of the drying kiln 5 receives the material output from the buffer bin 4; the material in the buffer bin 4 is conveyed to the input end of the drying kiln 5 via the conveying device 4 10; the discharge port of the conveying device 4 10 is equipped with a feeding slowing structure 3-1; the feeding slowing structure 3-1 is a conical slope type. The conveying device 4 10 can be an existing quantitative feeding device. In this embodiment, the front end of the drying kiln 5 is equipped with a dedicated buffer bin 4 and a quantitative feeding device to receive the wet granulated semi-finished material output from the conveying device 2 3, and as an important component of the feeding system of the drying kiln 5. The design goal of this structure is to achieve wet material buffering, stable feeding, and low-impact feeding, thereby effectively improving the stability of the drying process and product quality. The quantitative feeding device can be a screw feeder, belt feeder, or gravity feeder.

[0051] The buffer bin 4, as a key transitional unit in the drying system, primarily receives and temporarily stores the wet granulated semi-finished material conveyed by conveyor device 2 3. Setting up the buffer bin 4 at the front end of the drying kiln 5 effectively buffers and stabilizes the pressure, preventing shocks to the drying system caused by fluctuations in the front-end material supply (such as uneven flow rates of conveyor device 2 3, equipment start-ups and shutdowns). The design capacity of the buffer bin 4 can be adjusted according to actual production needs, ensuring a stable material supply to the front end of the drying kiln 5 under different operating conditions. A 650-type belt conveyor is selected as the main conveying equipment at the front end of the drying kiln 5. It features moderate length, stable operation, and large conveying capacity, making it suitable for continuous and uniform conveying of wet granulated semi-finished material. This belt conveyor can operate in single-line or parallel-line mode and can switch operating modes at any time according to actual needs, possessing high flexibility and operability. The 650-type belt conveyor is equipped with a baffle plate control device at its end to control the material's opening and closing status, further improving the controllability and safety of the system operation.

[0052] The discharge port of the 650-type belt conveyor is designed with a conical, gently sloping structure. This structure effectively reduces the impact force of material falling, allowing the material to transfer smoothly and slowly into the buffer bin 4. This avoids problems such as material breakage, clumping, or uneven distribution caused by high-speed feeding. The slope of the conical, gently sloping structure is optimized to ensure that the material slides naturally into the buffer bin 4 during its descent, reducing friction and collision between the material and the equipment, and further improving the stability and consistency of the feeding process.

[0053] The buffer bin 4 and the quantitative feeding system, as the core control unit of the feeding system of the drying kiln 5, primarily function to achieve uniform and continuous quantitative feeding. The quantitative feeding device is used to transport the wet granulated semi-finished material buffered in the buffer bin 4 to the input end of the drying kiln 5 at a stable rate. Quantitative feeding effectively avoids instability in the material layer thickness within the drying kiln 5 caused by fluctuations in the front-end feeding, thereby ensuring uniform material distribution and a stable drying temperature field within the kiln during the drying process, ultimately achieving consistency in drying quality and improving product qualification rate.

[0054] Conveying device 3 (6) is located at the output end of drying kiln 5 and is used to receive the material dried in drying kiln 5. Conveying device 3 (6) includes a vertical enclosed elevator 6-1 for vertically conveying the dried high-temperature granulated semi-finished product from a low position to a high-level conveying platform, realizing the elevation connection of subsequent process flows. The vertical enclosed elevator 6-1 can achieve enclosed conveying, with no dust spillage, high temperature resistance, stable operation, and is suitable for conveying granulated semi-finished product particles, without breakage or blockage. Conveying device 3 (6) is connected to conveying device 1 (2) via a connecting belt 12, which can convey large wet particles to the conveying channel of the discharge valve belt 6-5, and then screen them through the screening equipment corresponding to the discharge valve belt 6-5.

[0055] The high-level conveyor platform can be equipped with a belt conveyor; the primary main belt conveyor 6-2 receives the discharge from the vertical enclosed elevator 6-1 and horizontally conveys the dried granulated semi-finished product to the multi-production line feeding switching valve 6-4; the main belt conveyor support frame 6-3 supports the high-level conveyor platform, realizing the elevation connection of subsequent processes; the multi-production line feeding switching valve 6-4 can select different parallel production lines for material distribution and transmission, realizing the parallel conveying of materials on two lines, balancing capacity, reducing the load on a single line, and improving system reliability; the conveyor device 6-3 transmits the material to the feeding valve belt 6-5 at the screening equipment: it connects to multiple feeding valves 9, realizing multi-point synchronous discharge to the downstream screening machine, adapting to the needs of multi-station and multi-batch discharge.

[0056] The initiator bin 7 is used to receive the initiator material output from the discharge channel of conveyor device 2. The initiator material or large particles output from the feeding belt 1 of the granulation equipment can be sent to conveyor device 2 via the selector valve 8. A pneumatic switching valve can be used to select whether the material directly enters the initiator bin 7 through the discharge port or continues forward via the connecting belt 12 to connect with the discharge valves 9 of multiple screening machines. The qualified semi-finished products after screening by the screening equipment fall into the semi-finished product bin 11, achieving multi-line parallel operation, balanced capacity, stable operation, and simple maintenance, suitable for large-scale continuous industrial production. The semi-finished product bin 11 is used to receive qualified materials output from the screening equipment.

[0057] The control system is connected to the granulation equipment's feeding belt 1, selector valve 8, drying kiln 5, conveyor device 1 2, conveyor device 2 3, conveyor device 3 6, and discharge valve 9, respectively. It controls these components based on changes in the production process (starter, wet large granules, granules requiring drying). The production line composed of the feeding belt 1, conveyor device 2, and conveyor device 3 can be single-track, multi-track, or multi-track. Two or more production lines can be connected in parallel. A single production line can be expanded to two or more tracks as needed.

[0058] An embodiment of the present invention provides a drying kiln 5 system for granulation of oil fracturing proppant, which can automatically allocate the conveying route according to the specifications and functions of the granulated semi-finished product, improve the uniformity of drying, improve screening efficiency, and reduce energy consumption.

[0059] As a preferred embodiment of the above, the drying kiln 5 is a rotary drum drying kiln; the drying kiln 5 is connected to an exhaust fan; the drying kiln 5 can be a φ2.5×50m drying kiln system; the drying kiln 5 is extended, and the wet granulated semi-finished product enters from the kiln tail, and is continuously tumbled, lifted and axially propelled in the inclined, low-speed rotating cylinder 5-1 as the cylinder 5-1 rotates; the ambient hot air comes into countercurrent contact with the material, and through convection and conduction heat exchange, the free water and a small amount of bound water in the material are quickly removed, while ensuring the particle size and integrity of the semi-finished product. The drying kiln 5 is divided into sections according to the material conveying route: (1) Preheating section: the material absorbs heat and rises in temperature, and the surface moisture begins to evaporate; (2) Constant speed drying section: the moisture vaporizes rapidly, and the moisture content of the material continues to decrease; (3) Deceleration drying section: the internal moisture diffuses to the surface and is discharged, reaching the moisture content requirement of the finished product. This embodiment does not use an external heat source for heating. It relies solely on the exhaust fan at the kiln tail to draw in ambient air, which forms a countercurrent heat exchange with the material inside the kiln. This allows the wet granulation semi-finished product to stably remove free water and some capillary water under ambient temperature air blowing, with the moisture content controlled at ≤12%. It also ensures particle strength, roundness, and low breakage rate, significantly reducing energy consumption, heat damage, and equipment costs.

[0060] As a preferred embodiment of the above, the drying kiln 5 is provided with lifting plates 5-2; multiple lifting plates 5-2 are arranged in a ring in the drying kiln 5; the lifting plates 5-2 can improve the material dispersion, expand the hot air contact area, and improve the drying efficiency and uniformity.

[0061] As a preferred embodiment of the above embodiment, the lifting plate 5-2 has an inclination angle between its end 5-22 and root 5-21; the end 5-22 and root 5-21 of the lifting plate 5-2 are connected by an arc transition; the root 5-21 of the lifting plate 5-2 is vertically fixed to the inner wall of the drying kiln 5; the inclination angles are 50° and 70°. Preferably, the lifting plates 5-2 with an inclination angle of 50° and the lifting plates 5-2 with an inclination angle of 70° are alternately distributed along the axial direction of the drying kiln 5. In this embodiment, the lifting plate 5-2 adopts a gradient inclination angle design of 50° and 70° between its end 5-22 and root 5-21, forming a gradual transition from a gentle inclination angle to a steep inclination angle. This structure not only improves the material lifting efficiency, but also achieves gradual attenuation and control of impact energy during particle movement. Among them, the 50° inclined lifting plate 5-2 mainly undertakes the function of initial sliding and kinetic energy dissipation of particles, so that the kinetic energy of the particles is converted into friction and shearing during the sliding process along the plate surface, thereby effectively reducing the impact intensity of the particles on the plate and cylinder wall; while the 70° inclined lifting plate 5-2, while maintaining good throwing performance, uses the arc or inclined transition structure set at the base of the plate to buffer and guide the high-speed falling particles, so that they fall at a lower relative speed and angle, thereby avoiding local stress concentration caused by free fall impact.

[0062] The lifting plate 5-2 is made of 6mm thick high-strength steel plate and reinforced with full welding to ensure the stability and durability of the structure under high temperature and high impact conditions. This structural design effectively suppresses the vibration amplification effect of the plate during operation, preventing the impact of particles on the cylinder 5-1 from being aggravated by plate vibration, thereby further improving the service life and operational reliability of the equipment.

[0063] Inside the drying kiln 5, 16 sets of lifting plates 5-2 are evenly arranged at equal angles along the circumference of a regular dodecagon, ensuring that the material is uniformly divided into multiple streams within the cylinder 5-1. This avoids the formation of concentrated impact sources due to localized material accumulation, thus achieving a uniform distribution of impact loads around the cylinder 5-1. This arrangement, combined with the alternating use of gradient angles of 50° and 70° lifting plates 5-2, creates a continuous, spiral-shaped throwing trajectory for the material during the lifting process. This effectively controls the drop height and collision angle of the particles, reducing the kinetic energy of collisions between particles and between particles and the cylinder wall, achieving efficient drying and uniform dispersion of the material.

[0064] Through the coordinated design of 50° and 70° gradient angle selection, rounded / sloping transition structure of plate root and uniform arrangement of ring angles, this embodiment constructs a three-level impact reduction system of "initial kinetic energy dissipation - buffer guidance - spatial energy dispersion", which effectively realizes multi-level control and dissipation of particle impact energy, improves the operational stability and service life of drying kiln 5, and significantly reduces the wear and fatigue damage of cylinder 5-1 and lifting plate 5-2.

[0065] As a preferred embodiment of the above, the screening equipment has multiple output ports for outputting particles of different sizes; the initiator chamber 7 is connected to the output ports of the screening equipment, and small particles can be selected to be conveyed to the initiator chamber 7 as initiators. Large wet particles that do not require drying are directly conveyed to the discharge valve belt 6-5 of the screening equipment via the conveyor device 3 and the connecting belt 12, and after being screened by the screening equipment, they enter the semi-finished product silo 11.

[0066] To further clarify, while the terms "first," "second," etc., may be used herein to describe various elements, these terms should not limit the elements. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element; these terms are used only to distinguish one element from another. This does not depart from the scope of the exemplary embodiments. Similarly, "element one," "element two," and so on do not represent the order of elements; these terms are used only to distinguish one element from another. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items.

[0067] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A drying kiln system for granulating proppant in petroleum fracturing, characterized in that, Includes: feeding belt for granulation equipment, conveyor device one, conveyor device two, buffer bin for screening equipment, induction bin, semi-finished product bin, drying kiln, conveyor device three, and control system; a single production line can be expanded to two or more lines; The feeding belt of the granulation equipment is used to transport the granules produced by the granulation equipment. The feeding belt of the granulation equipment is equipped with a selection valve; the output port of the selection valve is connected to both conveying device one and conveying device two. The conveying device is used to receive the material output from the outlet of the selector valve; The second conveying device is used to receive the material output from the outlet of the second selector valve; The conveying device is equipped with a discharge valve; there are multiple discharge valves; the multiple discharge valves correspond to different lead discharge channels of the conveying device. The connecting belt at the end of the first conveyor is connected to the third conveyor to transport large particles that do not need to be dried to the third conveyor. The screening equipment is used to receive and screen the large particles that do not need to be dried output from the first conveyor. The buffer compartment is used to receive the materials output by the second conveying device; The input end of the drying kiln is used to receive the material output from the buffer silo; The conveying device three is installed at the output end of the drying kiln and is used to receive the material dried by the drying kiln and convey it to the screening equipment. The inlet chamber is used to receive the material output from the discharge channel of the first conveyor device; The semi-finished product silo is used to receive the material output from the screening equipment; The control system is connected to the feeding belt of the granulation equipment, the selector valve, the drying kiln, the first conveyor device, the second conveyor device, the third conveyor device, and the discharge valve, respectively, and is used to control the feeding belt of the granulation equipment, the selector valve, the drying kiln, the first conveyor device, the second conveyor device, the third conveyor device, and the discharge valve; The production line consisting of the feeding belt of the granulation equipment, the first conveyor device, and the second conveyor device can be one, two, or more.

2. The drying kiln system for granulation of oil fracturing proppant according to claim 1, characterized in that, The drying kiln is a rotary drum drying kiln; the drying kiln is connected to an exhaust fan; The material in the buffer bin is conveyed to the input end of the drying kiln via a conveying device. The discharge port of the fourth conveying device is equipped with a feeding slowing structure; the feeding slowing structure is a conical slope type.

3. The drying kiln system for granulation of oil fracturing proppant according to claim 1, characterized in that, The drying kiln is equipped with lifting plates; multiple lifting plates are arranged in a ring inside the drying kiln. The lifting plate has an angle between its end and root; the end and root of the lifting plate are connected by an arc; the root of the lifting plate is vertically fixed to the inner wall of the drying kiln. The tilt angles are 50° and 70°.

4. The drying kiln system for granulation of oil fracturing proppant according to claim 3, characterized in that, The lifting plates with an inclination angle of 50° and the lifting plates with an inclination angle of 70° are alternately distributed along the axial direction of the drying kiln.

5. The drying kiln system for granulation of oil fracturing proppant according to claim 1, characterized in that, The screening equipment has multiple output ports for outputting particles of different sizes; the initiator chamber is also connected to the small particle output port of the screening equipment.

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