Continuous processing line for citrus pulp based biochar fertilizer coating solidification

Abstract

The utility model discloses a kind of for citrus dreg base biochar fertilizer coating layer solidification continuous processing production line, especially applicable to citrus dreg base carbon bacteria fertilizer granule. Including furnace body and the conveying mesh belt passing through furnace body, pre-drying zone, solvent evaporation zone, low-temperature solidification zone and rapid cooling zone are formed by partition in furnace body. Pre-drying zone, solvent evaporation zone, low-temperature solidification zone's conveying mesh belt upper and lower are respectively provided with independently controlled hot air circulation system and infrared heating plate, realize two-way balanced mild heating;Hot air circulation system ensures temperature uniformity by uniform flow plate with oblique guide hole;Liftable movable heat insulation plate is arranged between each temperature zone, to realize accurate isolation;Low-temperature solidification zone can set atmosphere adjusting system according to process requirement;Rapid cooling zone is equipped with cooling coil pipe to realize rapid cooling and shaping.The utility model realizes low-temperature, uniform, continuous processing of bacteria-containing fertilizer coating layer solidification process, can effectively protect functional microbial activity, solve the core bottleneck of biofertilizer industrial production, significantly improve product consistency and quality.

Description

Technical Field

[0001] This utility model relates to the field of agricultural environmental protection and fertilizer manufacturing equipment technology, specifically a continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer. Background Technology

[0002] In the field of green agriculture, carbon-based bio-fertilizers (especially those made from agricultural waste such as citrus pomace and loaded with functional microorganisms) have attracted much attention due to their outstanding effects in soil improvement, slow nutrient release, and microbial activation. However, the core technical challenge of such fertilizers lies in how to effectively protect the activity of functional microorganisms (such as nitrogen-fixing bacteria and phosphate-solubilizing bacteria) that are sensitive to heat and mechanical stress during the coating and solidification process of fertilizer granules. Existing processing equipment, such as ordinary ovens or single-stage dryers, has significant limitations: First, the internal temperature field of the equipment is uneven, which easily generates local high-temperature points, leading to the death of a large number of functional microorganisms; second, the temperature zone is singular, which cannot provide a staged, mild heat treatment environment that matches the curing curve of the coating material (such as sodium alginate, polymers, etc.), easily leading to cracking of the coating layer and incomplete solidification; third, the lack of an efficient rapid cooling section makes the granules prone to sticking together and is not conducive to locking in the activity of the microorganisms. This seriously restricts the industrial and standardized production of high-performance carbon-based bio-fertilizers. Therefore, there is an urgent need to develop a continuous processing equipment that can achieve precise temperature control in different zones, uniform and gentle heating, and rapid cooling. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a production line for heat treatment of fertilizer granule coating. By setting up multiple functionally independent temperature zones, independent upper and lower temperature heating systems and forced cooling modules, it can solve the problems of uneven temperature, high thermal stress, low survival rate of microorganisms and discontinuous production in existing equipment when processing microbial fertilizers. This enables high-quality and continuous solidification treatment of coated carbon-based bio-fertilizer granules and ensures high activity of functional microorganisms.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a continuous processing production line for solidification of coating layer of citrus residue-based biochar fertilizer, including a furnace body and a conveyor belt installed through the furnace body. The furnace body is formed into multiple compartments by multiple partitions. The multiple compartments are conveyed by the conveyor belt in the following order: pre-drying zone, solvent evaporation zone, low-temperature curing zone and rapid cooling zone. The pre-drying zone, solvent evaporation zone, and low-temperature curing zone are equipped with independently controlled hot air circulation systems above the conveyor belts, and independently controlled infrared heating plates below the conveyor belts. Cooling coils are installed around the conveyor belt in the rapid cooling zone.

[0005] In a preferred embodiment, the hot air circulation system includes a hood located inside the furnace body and an air supply pipe located on the back of the furnace body and connected to the hood. The air supply pipe is connected to a centrifugal fan and is also connected to a heater.

[0006] In a preferred embodiment, a flow equalization plate is provided inside the furnace body below the air hood in the hot air circulation system, and multiple sets of guide holes are distributed circumferentially on the flow equalization plate.

[0007] In a preferred embodiment, the guide holes are oblique holes, and the inclination directions of two adjacent sets of guide holes are opposite.

[0008] In a preferred embodiment, each of the multiple partitions is provided with a movable heat insulation plate that can move up and down. The upper ends of the multiple movable heat insulation plates extend to the outside of the top of the furnace body and are connected to the same lifting plate. The top of the furnace body is provided with a top support and a lifting control cylinder that controls the lifting action of the lifting plate.

[0009] In a preferred embodiment, an atmosphere sensor and an atmosphere regulating pipeline are provided on the side wall of the low-temperature curing zone; The atmosphere conditioning pipeline is equipped with a flow regulating valve, and both the flow regulating valve and the atmosphere sensor are connected to the controller.

[0010] In a preferred embodiment, a hopper is provided above the conveyor belt at the feed end of the furnace body, and a planetary feeder is provided inside the hopper.

[0011] In a preferred embodiment, the bottom of the hopper is provided with an elastic scraper, which is fixed to the bottom of the hopper by a pin with a torsion spring, and the elastic scraper is in contact with the surface of the conveyor belt.

[0012] The fertilizer granule coating heat treatment production line provided by this utility model, by adopting the above-mentioned structure, has the following beneficial effects: (1) By precisely dividing the furnace body into a pre-drying zone, a solvent evaporation zone, a low-temperature curing zone, and a rapid cooling zone, and equipping the first three zones with a mild hot air circulation system and an infrared heating plate with independent upper and lower controls, a mild heating and cooling curve that is highly matched with the curing mechanism of the coating layer is provided for fertilizer granules containing functional microorganisms. This design effectively avoids the thermal damage of functional microorganisms caused by local high temperatures, and at the same time prevents the coating layer from cracking or uneven curing due to thermal stress, ensuring that the coating layer is dense and intact, providing a long-term and stable "micro-refuge" for microorganisms, and significantly improving the effectiveness and shelf life of the biochar fertilizer product; (2) The flow equalization plate at the bottom of the hot air circulation system and the flow guide holes with opposite inclination, together with the movable heat insulation plate that can be raised and lowered independently, jointly construct a stable and uniform heat field inside each temperature zone, eliminating temperature dead zones, so that the same batch of fertilizer granules can obtain a highly consistent heat treatment effect. The rapid cooling zone can quickly shape the granules, prevent adhesion, and lock the activity of the microbial community. It successfully solves the core obstacle in the industrial production of microbial fertilizers, greatly improves product consistency, has strong process adaptability, and can meet the precision manufacturing needs of specific products such as citrus residue-based carbon microbial fertilizer. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the rear view structure of this utility model.

[0015] Figure 3 This is a top view of the flow equalization plate structure of this utility model.

[0016] In the diagram: Furnace body 1, pre-drying zone 101, solvent evaporation zone 102, low-temperature curing zone 103, rapid cooling zone 104, partition 2, hot air circulation system 3, infrared heating plate 4, flow equalization plate 5, flow guide hole 501, movable heat insulation plate 6, lifting plate 7, lifting control cylinder 8, cooling coil 9, atmosphere sensor 10, atmosphere regulating pipeline 11, conveyor belt 12, hopper 13, planetary feeder 14, elastic scraper 15, air duct 16, centrifugal fan 17, heater 18, flow regulating valve 19, controller 20. Detailed Implementation

[0017] like Figure 1-3 In the present invention, a continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer includes a furnace body 1 and a conveyor belt 12 passing through the furnace body 1. The furnace body 1 is formed into multiple compartments by multiple partitions 2. The multiple compartments are conveyed by the conveyor belt 12 in the following directions: pre-drying zone 101, solvent evaporation zone 102, low-temperature curing zone 103 and rapid cooling zone 104. An independently controlled hot air circulation system 3 is provided above the conveyor belt 12 in the pre-drying zone 101, solvent evaporation zone 102, and low-temperature curing zone 103, and an independently controlled infrared heating plate 4 is provided below the conveyor belt 12. Cooling coils 9 are provided around the conveyor belt 12 within the rapid cooling zone 104.

[0018] In a preferred embodiment, the hot air circulation system 3 includes a hood located inside the furnace body 1 and an air supply pipe 16 located on the back of the furnace body 1 and connected to the hood. The air supply pipe 16 is connected to a centrifugal fan 17 and is also connected to a heater 18.

[0019] In a preferred embodiment, a flow equalization plate 5 is provided inside the furnace body 1 below the air hood in the hot air circulation system 3, and multiple sets of guide holes 501 are distributed circumferentially on the flow equalization plate 5.

[0020] In a preferred embodiment, the guide hole 501 is an oblique hole, and the inclination directions of two adjacent sets of guide holes 501 are opposite.

[0021] In a preferred embodiment, each of the multiple partitions 2 is provided with a movable heat insulation plate 6 that can move up and down. The upper ends of the multiple movable heat insulation plates 6 extend to the outside of the top of the furnace body 1 and are connected to the same lifting plate 7. The top of the furnace body 1 is provided with a top support and a lifting control cylinder 8 that controls the lifting action of the lifting plate 7.

[0022] In a preferred embodiment, an atmosphere sensor 10 and an atmosphere regulating pipe 11 are provided on the side wall of the low-temperature curing zone 103; The atmosphere conditioning pipeline 11 is equipped with a flow regulating valve 19, and the flow regulating valve 19 and the atmosphere sensor 10 are both connected to the controller 20.

[0023] In a preferred embodiment, a hopper 13 is provided above the conveyor belt 12 at the feeding end of the furnace body 1, and a planetary feeder 14 is provided inside the hopper 13.

[0024] In a preferred embodiment, the bottom of the hopper 13 is provided with an elastic scraper 15, which is fixed to the bottom of the hopper 13 by a pin with a torsion spring, and the elastic scraper 15 is in contact with the surface of the conveyor belt 12.

[0025] The operating principle of this utility model is as follows: The coated citrus residue-based charcoal microbial fertilizer wet granules are collected by hopper 13 and fed stably by the rotation of planetary feeder 14. The outflowing granules are then scraped flat by the elastic scraper 15 at the bottom, forming a uniform layer of material on the conveyor belt 12, and then enter the furnace body.

[0026] The particles first enter the pre-drying zone 101. The upper and lower heating systems in this zone are activated to provide heat at a lower temperature (e.g., 40-60°C). Hot air is blown evenly onto the particles under the guidance of the flow equalization plate 5, gently removing most of the moisture from their surface, preparing them for subsequent curing, and avoiding high-temperature stress on the functional microbial community.

[0027] The particles enter the solvent evaporation zone 102 via a conveyor belt. The temperature in this zone is appropriately raised (e.g., 60-75℃), and the infrared heating plate 4 below, combined with the hot air system above, ensures the full and stable evaporation of moisture or organic solvents in the coating material (e.g., sodium alginate). Simultaneously, the hot air system promptly removes the generated steam. Precise temperature control is maintained during this stage to avoid thermal shock.

[0028] The particles continue into the core low-temperature curing zone 103. The temperature in this zone is strictly controlled within the optimal curing temperature range of the coating material (e.g., 70-85℃). During this period, the environment can be monitored in real-time by an atmosphere sensor 10 (e.g., a humidity sensor), and the controller 20, by adjusting the flow regulating valve 19, introduces dry hot air or inert gas into the zone, precisely controlling the environmental parameters within the set range. This ensures that the coating layer is fully cross-linked and cured to form a stable structure, while simultaneously providing a safe living environment for internal functional microorganisms (e.g., nitrogen-fixing bacteria, phosphate-solubilizing bacteria). Independent and balanced heating from top and bottom ensures extreme uniformity of heating of the particles during the critical curing stage, preventing localized overheating.

[0029] The solidified granules then enter the rapid cooling zone 104. The cooling medium circulating in the cooling coil 9 quickly removes the heat from the granules, rapidly cooling them to near room temperature. This process allows the coating layer to quickly set, preventing granules from sticking together and inducing the functional microorganisms to enter a dormant state, which is beneficial for maintaining the activity of the microbial community during long-term storage. Finally, the cooled high-activation carbon microbial fertilizer granules are conveyed out of the furnace via the conveyor belt 12, completing the entire solidification process.

[0030] By centrally setting and controlling the temperature, conveyor belt speed, height of movable heat insulation plate, and atmosphere parameters of each zone through controller 20, this utility model realizes precise and automated management of the entire process of solidification of carbon-based bio-fertilizer coating layer, providing reliable equipment support for the large-scale and standardized production of high-performance bio-fertilizer.

Claims

1. A continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer, comprising a furnace body (1) and a conveyor belt (12) passing through the furnace body (1), characterized in that: The furnace body (1) is formed into multiple compartments by multiple partitions (2). The multiple compartments are transported by the conveyor belt (12) in the following directions: pre-drying zone (101), solvent evaporation zone (102), low temperature curing zone (103) and rapid cooling zone (104). The conveyor belts (12) in the pre-drying zone (101), solvent evaporation zone (102), and low-temperature curing zone (103) are equipped with independently controlled hot air circulation systems (3) above them, and independently controlled infrared heating plates (4) are provided below them. The rapid cooling zone (104) is provided with cooling coils (9) surrounding the conveyor belt (12).

2. The continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 1, characterized in that: The hot air circulation system (3) includes a hood located inside the furnace body (1) and an air supply pipe (16) located on the back of the furnace body (1) and connected to the hood. The air supply pipe (16) is connected to a centrifugal fan (17) and is also connected to a heater (18).

3. The continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 2, characterized in that: The hot air circulation system (3) has a flow equalization plate (5) inside the furnace body (1) below the air hood, and multiple sets of flow guide holes (501) are distributed circumferentially on the flow equalization plate (5).

4. A continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 3, characterized in that: The guide hole (501) is an oblique hole, and the inclination directions of two adjacent groups of guide holes (501) are opposite.

5. A continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 1, characterized in that: Each of the partitions (2) is provided with a movable heat insulation plate (6) that can move up and down. The upper end of the multiple movable heat insulation plates (6) extends to the outside of the top of the furnace body (1) and is connected to the same lifting plate (7). The top of the furnace body (1) is provided with a top support and a lifting control cylinder (8) that controls the lifting action of the lifting plate (7).

6. A continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 1, characterized in that: An atmosphere sensor (10) and an atmosphere regulating pipe (11) are provided on the side wall of the low-temperature curing zone (103). The atmosphere conditioning pipeline (11) is equipped with a flow regulating valve (19), and the flow regulating valve (19) and the atmosphere sensor (10) are both connected to the controller (20).

7. A continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 1, characterized in that: A hopper (13) is provided above the conveyor belt (12) at the feeding end of the furnace body (1), and a planetary feeder (14) is provided inside the hopper (13).

8. A continuous processing production line for solidifying the coating layer of citrus residue-based biochar fertilizer according to claim 7, characterized in that: The bottom of the hopper (13) is provided with an elastic scraper (15). The elastic scraper (15) is fixed to the bottom of the hopper (13) by a pin with a torsion spring. The elastic scraper (15) is in contact with the surface of the conveyor belt (12).

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