Efficient circulating hot blast stove for processing phosphorus fertilizer

Abstract

The utility model discloses a kind of phosphatic fertilizer processing efficient circulating hot blast furnace, it is related to phosphatic fertilizer production and processing equipment technical field, and it includes: furnace body, the left side surface of the furnace body is fixedly connected with combustor communicated in its inside, the front surface of the combustor is respectively fixedly connected with gas inlet pipe and combustion air inlet pipe communicated in its inside from left to right, the inside circumferential side of furnace body is fixedly connected with baffle, and the upper surface of furnace body is fixedly connected with pipeline one communicated in its inside at the left side of baffle;The design is by constructing step waste heat recovery chain, realize flue gas heat energy three-stage efficient recovery;By introducing purification tail gas controllable circulation system, low-temperature tail gas after deep purification is proportioned backflow to combustion zone;By adopting clean hot air indirect generation and uniform air distribution structure, to baffle physical isolation combustion flue gas and process hot air channel, combined with U-shaped alloy heat exchange tube group realizes pollution-free heat transfer;By based on multi-parameter sensing network real-time monitoring temperature, pressure, flow and pollutant concentration.

Description

Technical Field

[0001] This utility model relates to the technical field of phosphate fertilizer production and processing equipment, and in particular to a high-efficiency circulating hot air furnace for phosphate fertilizer processing. Background Technology

[0002] The drying, granulation and cooling processes of phosphate fertilizers (such as monoammonium phosphate, diammonium phosphate, and superphosphate) require a continuous supply of high-temperature (usually 300-600℃), clean and temperature-stable hot air. The quality of the hot air directly affects the product's moisture control, particle strength and appearance purity. As the core heat source equipment, the energy efficiency and stability of traditional hot air furnaces are crucial for cost control and quality assurance in phosphate fertilizer production.

[0003] The traditional hot blast stoves currently widely used in the industry have the following key bottlenecks:

[0004] I. Low energy efficiency and energy waste: High-temperature flue gas carries a large amount of waste heat and is directly emitted, with a heat recovery rate of less than 60%, resulting in high fuel consumption and high operating costs.

[0005] II. Unstable quality of hot air in the process: Combustion fluctuations and load changes cause the supply air temperature to drift, resulting in uneven moisture distribution, large differences in particle strength, and a decrease in grade of phosphate fertilizer products.

[0006] Third, significant environmental pollution risks: sulfur and fluorine impurities in phosphate rock raw materials generate SO2, fluorides and dust upon combustion. Traditional equipment has weak exhaust gas treatment capabilities, and pollutant emissions are difficult to meet increasingly stringent environmental protection standards.

[0007] 4. Insufficient cleanliness of hot air: The flue gas comes into direct or indirect contact with the process hot air, resulting in unburned carbon particles, ash and acidic gases contaminating the product and reducing the whiteness and chemical purity of phosphate fertilizer. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides a high-efficiency circulating hot air furnace for phosphate fertilizer processing, which solves the problems mentioned in the background.

[0009] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-efficiency circulating hot air furnace for phosphate fertilizer processing, comprising: a furnace body, a burner connected to the left side of the furnace body and communicating with the interior therein, a gas inlet pipe and a combustion air inlet pipe connected to the interior therein respectively from left to right on the front surface of the burner, a partition plate fixed to the inner circumferential side of the furnace body, and a pipe connected to the interior therein fixed to the left side of the upper surface of the furnace body on the partition plate, a fan connected to the interior therein fixed to the right side of the upper surface of the furnace body on the partition plate, and a pipe connected to the interior therein fixed to the right side of the upper surface of the furnace body on the partition plate, and a second pipe connected to the interior therein fixed to the right side of the furnace body.

[0010] Two heat exchange shells are installed sequentially from front to back at the front of the furnace body. A flue gas inlet pipe is fixedly connected to the right end of the upper surface of the heat exchange shell and a flue gas outlet pipe is fixedly connected to the left end of the lower surface of the heat exchange shell. A hot gas inlet pipe is fixedly connected to the left end of the upper surface of the heat exchange shell and a hot gas outlet pipe is fixedly connected to the left of the flue gas outlet pipe. A pipe three is fixedly connected between the flue gas outlet pipe at the rear heat exchange shell and the flue gas inlet pipe at the front heat exchange shell. A pipe four is fixedly connected to the hot gas outlet pipe at the rear heat exchange shell. A heat exchange mechanism is provided inside the heat exchange shell.

[0011] A purification mechanism is located on the left side of the furnace body.

[0012] As a further technical solution of this utility model, the heat exchange mechanism includes two vertical plates, left and right, and a plurality of U-shaped heat exchange tubes are fixedly connected through the two vertical plates. A horizontal plate is fixedly connected to the left side surface of the left vertical plate.

[0013] As a further technical solution of this utility model, the purification mechanism includes a cyclone dust collector, a purification tank, and an adsorbent tank. The air inlet end of the cyclone dust collector is fixedly connected to pipe five, and the air outlet end of the cyclone dust collector is fixedly connected to pipe six. The upper surface of the purification tank is fixedly connected to a diversion valve communicating with its interior. One diversion end of the diversion valve is fixedly connected to pipe seven. A filter plate is fixedly connected to the inner circumferential side of the purification tank. The upper surface of the adsorbent tank is fixedly connected to fan two. The air inlet end of fan two is fixedly connected to pipe eight, and the air outlet end of fan two is fixedly connected to pipe nine.

[0014] As a further technical solution of this utility model, the end of the first pipe away from the furnace body is fixed to the flue gas inlet pipe at the rear heat exchange shell, the end of the second pipe away from the furnace body is fixed to the hot gas inlet pipe at the front heat exchange shell, and the end of the fourth pipe away from the hot gas outlet pipe is fixed to the combustion air inlet pipe, and the fourth pipe is connected to the interior of the combustion air inlet pipe.

[0015] As a further technical solution of this utility model, both vertical plates are fixed to the inner circumferential side of the heat exchange shell, the flue gas inlet pipe and the flue gas outlet pipe are located between the two vertical plates, the hot gas inlet pipe and the hot gas outlet pipe are located on the left side of the left vertical plate, one end of the U-shaped heat exchange tube is located above the horizontal plate, and the other end of the U-shaped heat exchange tube is located below the horizontal plate. The front, rear and left surfaces of the horizontal plate are all fixed to the inner circumferential side of the heat exchange shell.

[0016] As a further technical solution of this utility model, the end of pipe five away from the cyclone dust collector is fixed to the flue gas outlet pipe at the front heat exchange shell, the end of pipe six away from the cyclone dust collector is fixed to the lower end of the left side surface of the purification tank, and pipe six is ​​connected to the inside of the purification tank, pipe eight is fixed to the upper surface of the adsorbent tank, and the end of pipe nine away from the fan two is fixed to the upper end of the left side surface of the purification tank, and pipe nine is connected to the inside of the purification tank. The connection between pipe nine and the purification tank is located below the filter plate.

[0017] This utility model provides a high-efficiency circulating hot blast stove for phosphate fertilizer processing, which has the following advantages compared with the prior art:

[0018] 1. This design is a high-efficiency circulating hot air furnace for phosphate fertilizer processing. By constructing a tiered waste heat recovery chain, connecting a high-temperature flue gas and air preheater, a hot air reheater, and an integrated device for exhaust gas purification and preheating, it achieves three-stage high-efficiency recovery of flue gas heat energy: the high-temperature section preheats the combustion air to medium-high temperature, the medium-temperature section precisely controls the process hot air temperature, and the low-temperature section combines dust removal, desulfurization, and defluorination processes to deeply recover waste heat and preheat fresh air, significantly reducing the exhaust gas temperature to near the ambient level, significantly improving the overall thermal efficiency of the system, and reducing fuel consumption.

[0019] 2. This design is a high-efficiency circulating hot air furnace for phosphate fertilizer processing. By introducing a controllable circulation system for purified exhaust gas, the deeply purified low-temperature exhaust gas is proportionally returned to the combustion zone. On the one hand, it acts as an inert medium to reduce the peak combustion temperature and oxygen concentration, thus inhibiting the generation of nitrogen oxides from the source. On the other hand, the physical sensible heat it carries is reused, reducing the amount of fresh air introduced and the heat loss from exhaust. This technology realizes closed-loop utilization of thermal energy and synergistic control of pollutants, simultaneously improving energy efficiency and environmental performance.

[0020] 3. This design presents a high-efficiency circulating hot air furnace for phosphate fertilizer processing. It adopts a structure for indirect generation and uniform air distribution of clean hot air, and uses baffles to physically isolate combustion flue gas from the process hot air channel. Combined with a group of U-shaped alloy heat exchange tubes, it achieves pollution-free heat transfer. At the same time, it is equipped with a flow guiding and uniform air distribution component in the hot air channel to ensure the uniformity of outlet hot air temperature and the stability of flow rate. This completely solves the problems of reduced product whiteness and uneven moisture content caused by contaminant impurities in traditional hot air furnaces, thus ensuring the quality of phosphate fertilizer.

[0021] 4. This design provides a high-efficiency circulating hot air furnace for phosphate fertilizer processing. By integrating an intelligent collaborative control system, it monitors temperature, pressure, flow rate, and pollutant concentration in real time based on a multi-parameter sensor network. Through the core controller, it dynamically links fuel supply, combustion air volume, exhaust gas circulation ratio, and desulfurizer injection amount to achieve high-precision closed-loop control of hot air parameters, optimization of combustion efficiency, and ultra-low exhaust gas emissions. This significantly improves the system's adaptability and operational reliability, extends equipment life, and reduces maintenance costs. Attached Figure Description

[0022] Figure 1 A schematic diagram of a high-efficiency circulating hot air furnace for phosphate fertilizer processing;

[0023] Figure 2 A cross-sectional view of the heat exchange shell of a high-efficiency circulating hot blast stove for phosphate fertilizer processing;

[0024] Figure 3 A schematic diagram of a purification mechanism for a high-efficiency circulating hot air furnace in phosphate fertilizer processing;

[0025] Figure 4 This is a cross-sectional view of a purification tank in a high-efficiency circulating hot air furnace for phosphate fertilizer processing.

[0026] In the diagram: 1. Furnace body; 2. Burner; 3. Gas inlet pipe; 4. Combustion air inlet pipe; 5. Baffle plate; 6. Pipe 1; 7. Fan 1; 8. Pipe 2; 9. Heat exchange shell; 10. Flue gas inlet pipe; 11. Flue gas outlet pipe; 12. Hot gas inlet pipe; 13. Hot gas outlet pipe; 14. Pipe 3; 15. Pipe 4; 16. Heat exchange mechanism; 17. Vertical plate; 18. U-shaped heat exchange tube; 19. Horizontal plate; 20. Purification mechanism; 21. Cyclone dust collector; 22. Purification tank; 23. Adsorbent tank; 24. Pipe 5; 25. Pipe 6; 26. Diverter valve; 27. Pipe 7; 28. Filter plate; 29. ​​Fan 2; 30. Pipe 8; 31. Pipe 9. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-4 This utility model provides a technical solution for a high-efficiency circulating hot blast stove for phosphate fertilizer processing:

[0029] The combustion unit consists of furnace body 1, burner 2, gas inlet pipe 3, and combustion air inlet pipe 4;

[0030] The two-stage heat exchange shell 9 and its internal structure constitute the heat exchange unit;

[0031] The cyclone dust collector 21, purification tank 22, adsorbent tank 23, diversion valve 26 and pipelines constitute a purification circulation unit;

[0032] There are also control systems integrated into PLC / DCS, including temperature sensors, pressure sensors, and flue gas analyzers.

[0033] like Figure 1As shown, it includes: a furnace body 1, a burner 2 connected to the left side surface of the furnace body 1, a gas inlet pipe 3 and a combustion air inlet pipe 4 connected to the burner 2 from left to right, a partition plate 5 connected to the inner circumferential side of the furnace body 1, and a pipe 6 connected to the upper surface of the furnace body 1 on the left side of the partition plate 5, a fan 7 connected to the upper surface of the furnace body 1 on the right side of the partition plate 5, and a pipe 8 connected to the upper surface of the furnace body 1 on the right side of the partition plate 5.

[0034] Furnace body 1 adopts a double-layer steel shell structure, with an inner refractory castable layer and an outer carbon steel shell. The interlayer is filled with aluminum silicate fiber insulation cotton to reduce heat loss.

[0035] Burner 2 can be a low-NOx burner;

[0036] The gas inlet pipe 3 is used to transport natural gas or coal gas, and a regulating valve is provided at the end near the burner.

[0037] The combustion air inlet pipe 4 supplies preheated high-temperature air;

[0038] The partition 5 is made of silicon carbide ceramic, with a thermal conductivity of 120-200 W / (m·K), which divides the furnace cavity into a left combustion zone and a right hot air heating zone.

[0039] The air inlet end of the blower 7 is fixedly connected to an air inlet pipe, which is used to draw outside air into the furnace body 1 located in the rear area of ​​the partition 5.

[0040] Pipe 6 at the top of furnace body 1 connects the flue gas outlet of the combustion zone to the rear heat exchange shell; pipe 8 on the right side of furnace body 1 transports the hot air generated in the hot air heating zone to the front heat exchange shell; fan 7 installed at the inlet of the hot air heating zone has its air inlet end connected to the external air inlet pipe to provide clean cold air into the furnace.

[0041] A high-efficiency air distribution component is installed at the outlet of the hot air heating zone on the right side of furnace body 1, that is, before the inlet of pipe 2 8. This component consists of a three-layer structure:

[0042] Guide cone: A cone-shaped stainless steel component with a large diameter facing the hot air heating zone, forcing the airflow to diffuse circumferentially;

[0043] Porous flow equalizer: Located behind the flow guide cone, the plate surface has an opening ratio of 40%-60%, and the aperture gradually increases from the center to the edge to compensate for the attenuation of airflow at the edge;

[0044] Honeycomb rectifier grid: 50mm thick heat-resistant stainless steel honeycomb mesh with 10mm aperture and a length-to-diameter ratio of 5:1, to eliminate airflow vortices.

[0045] The three factors work together to ensure that the temperature difference of hot air at the inlet section of pipe 28 is ≤±2℃ and the flow velocity difference is ≤10%, thus ensuring the uniformity of hot air in subsequent processes.

[0046] like Figure 1 and Figure 2 As shown, two heat exchange shells 9 are installed sequentially from front to back at the front of the furnace body 1. A flue gas inlet pipe 10 is fixedly connected to the right end of the upper surface of each heat exchange shell 9, communicating with its interior. One pipe 6, the end furthest from the furnace body 1, is fixedly connected to the flue gas inlet pipe 10 at the rear heat exchange shell 9. A flue gas outlet pipe 11, communicating with its interior, is fixedly connected to the left end of the lower surface of each heat exchange shell 9. A hot air inlet pipe 12, communicating with its interior, is fixedly connected to the left end of the upper surface of each heat exchange shell 9. Another pipe 8, the end furthest from the furnace body 1, is fixedly connected to the hot air inlet pipe 12 at the front heat exchange shell 9. A hot air outlet pipe 13, communicating with its interior, is fixedly connected to the left side of the flue gas outlet pipe 11 on the lower surface of each heat exchange shell 9. A third pipe 14 is fixedly connected between the flue gas outlet pipe 11 at the rear heat exchange shell 9 and the flue gas inlet pipe 10 at the front heat exchange shell 9. A fourth pipe 14 is fixedly connected to the hot air outlet pipe 13 at the rear heat exchange shell 9. 5. One end of pipe 4 15 away from the hot gas outlet pipe 13 is fixed to the combustion air inlet pipe 4, and pipe 4 15 is connected to the inside of the combustion air inlet pipe 4. A heat exchange mechanism 16 is provided inside the heat exchange shell 9. The heat exchange mechanism 16 includes two vertical plates 17 on the left and right. Both vertical plates 17 are fixed to the inner circumferential side of the heat exchange shell 9. The flue gas inlet pipe 10 and the flue gas outlet pipe 11 are located between the two vertical plates 17. The hot gas inlet pipe 12 and the hot gas outlet pipe 13 are located to the left of the left vertical plate 17. Multiple U-shaped heat exchange tubes 18 are fixedly connected through the two vertical plates 17. A horizontal plate 19 is fixed to the left side of the left vertical plate 17. One end of the U-shaped heat exchange tube 18 is located above the horizontal plate 19, and the other end of the U-shaped heat exchange tube 18 is located below the horizontal plate 19. The front, back and left sides of the horizontal plate 19 are fixed to the inner circumferential side of the heat exchange shell 9.

[0047] Rear heat exchange shell 9:

[0048] The flue gas inlet pipe 10 receives the high-temperature flue gas (600-800℃) discharged from the furnace body through pipe 6;

[0049] U-shaped heat exchange tube 18 is made of high-temperature resistant alloy such as Incoloy 800H, runs through the two vertical plates 17, and combustion air flows inside the tube;

[0050] The flue gas flows around the U-shaped tube between the 17 vertical plates, and transfers heat to the air inside the tube through the tube wall;

[0051] The preheated high-temperature air (200-400℃) is transported to the combustion air inlet pipe 4 via the hot air outlet pipe 13 and pipe 4 15.

[0052] Front heat exchange shell 9:

[0053] The flue gas inlet pipe 10 receives the medium-temperature flue gas (300-500℃) discharged from the rear through pipe 3 14;

[0054] The hot air inlet pipe 12 receives the initial hot air (400-600℃) from the furnace hot air heating zone through pipe 2 8;

[0055] The heat exchange mechanism 16 of the same type reheats or adjusts the temperature of the hot air, and outputs process hot air with a stable temperature fluctuation of ±3℃, which is then sent to phosphate fertilizer processing through the hot air outlet pipe 13.

[0056] A swirl vane assembly can be added inside the hot air outlet pipe 13 at the front heat exchange shell 9 to make the output hot air rotate axially, further reducing the temperature stratification phenomenon.

[0057] like Figure 1 , Figure 3 and Figure 4 As shown, a purification mechanism 20 is provided on the left side of the furnace body 1. The purification mechanism 20 includes a cyclone dust collector 21, a purification tank 22, and an adsorbent tank 23. A pipe 24 is fixedly connected to the air inlet end of the cyclone dust collector 21. The end of the pipe 24 away from the cyclone dust collector 21 is fixedly connected to the flue gas outlet pipe 11 at the front heat exchange shell 9. A pipe 25 is fixedly connected to the air outlet end of the cyclone dust collector 21. The end of the pipe 25 away from the cyclone dust collector 21 is fixedly connected to the lower end of the left side surface of the purification tank 22, and the pipe 25 connects to the interior of the purification tank 22. A branch pipe connecting to the interior is fixedly connected to the upper surface of the purification tank 22. A flow valve 26 is connected to a pipe 27 at one of its diversion ends. A filter plate 28 is fixed to the inner circumferential side of the purification tank 22. A fan 29 is fixed to the upper surface of the adsorbent tank 23. A pipe 30 is fixed to the air inlet end of the fan 29. The pipe 30 passes through and is fixed to the upper surface of the adsorbent tank 23. A pipe 31 is fixed to the air outlet end of the fan 29. The end of the pipe 31 away from the fan 29 is fixed to the upper left side surface of the purification tank 22 and is connected to the interior of the purification tank 22. The connection between the pipe 31 and the purification tank 22 is located below the filter plate 28.

[0058] The low-temperature flue gas (150-250℃) in the front heat exchange shell 9 enters the cyclone dust collector 21 for dust removal through the flue gas outlet pipe 11 and pipe 24.

[0059] Fan 29 is a commonly used conveying equipment in industry. It belongs to the category of industrial centrifugal fans (refer to GB / T3235-2008 "Technical Conditions for Centrifugal Fans"). It uses mechanical seals or labyrinth seals between the motor and the impeller cavity to ensure that foreign objects cannot enter the motor cavity in reverse when rotating at high speed. Therefore, no damage or other problems will occur when sucking up foreign objects.

[0060] Fan 29 uses wind power to draw the adsorbent, such as quicklime, from the adsorbent tank 23 into the purification tank 22 to remove acidic gases such as SO2 and HF from the flue gas.

[0061] The filter plate is a porous ceramic plate with 28, which blocks unreacted adsorbent particles and ensures the cleanliness of the tail gas.

[0062] Pipe 727 is fixed to the air inlet pipe at the air inlet end of the fan and is connected to its interior;

[0063] Diverter valve 26 discharges a portion of the deeply purified exhaust gas at 100-150℃ through pipe 27, preheating the fresh air.

[0064] Furthermore, the control system in this utility model includes:

[0065] Monitoring layer:

[0066] Temperature sensor: Real-time data collection of furnace, inlet and outlet temperatures of heat exchangers at all levels, and hot air outlet temperatures;

[0067] Pressure sensor: monitors combustion chamber negative pressure and pipeline resistance;

[0068] Flue gas analyzer: Detects the concentrations of O2, SO2, and NOx in exhaust gases online.

[0069] Control layer (PLC / DCS):

[0070] Temperature control: Dynamically adjust the opening of the gas regulating valve and the frequency conversion of the combustion fan (primary and secondary stages) according to the hot air outlet set value;

[0071] Environmental control: Based on SO2 / NOx monitoring data, automatically adjust the amount of quicklime injected (frequency converter of the blower) and the exhaust gas recirculation ratio (opening of the diversion valve);

[0072] Safety protection: When the furnace temperature exceeds the limit or the negative pressure is abnormal, the gas supply will be interlocked and cut off.

[0073] The working principle of this utility model is as follows: Gas enters the burner 2 through the gas inlet pipe 3, mixes with the preheated high-temperature air supplied by the combustion air inlet pipe 4, and burns in the combustion zone on the left side of the furnace body 1; the high-temperature flue gas enters the flue gas inlet pipe 10 of the rear heat exchange shell 9 through pipe 1 6, flows through the outer wall of the U-shaped heat exchange tube 18 of the heat exchange mechanism 16, and heats the combustion air inside the tube to 200-400℃. This preheated air then returns to the combustion air inlet pipe 4 through the hot gas outlet pipe 13 and pipe 4 15; the cooled flue gas enters the flue gas inlet pipe 10 of the front heat exchange shell 9 through the flue gas outlet pipe 11 and pipe 3 14; simultaneously, the fan 7 draws external cold air into the hot air heating zone on the right side of the furnace body 1, which is then isolated and heated by the partition 5 to form initial hot air at 400-600℃. This initial hot air enters the front heat exchange shell 9 through pipe 2 8 and hot gas inlet pipe 12, and is reheated by the flue gas in the U-shaped heat exchange tube 18. Hot air with a final stable temperature (±3℃) is output to the phosphate fertilizer processing equipment through hot air outlet pipe 13; flue gas with a temperature of 150-250℃ discharged from the front heat exchange shell 9 enters the cyclone dust collector 21 for dust removal through flue gas outlet pipe 11 and pipe 5 24, and then enters from the bottom of the purification tank 22 through pipe 6 25, reacting with quicklime extracted from the adsorbent tank 23 by fan 2 29 through pipe 8 30 and injected through pipe 9 31 for desulfurization and defluorination; the purified tail gas with a temperature of 100-150℃ is diverted through the diversion valve 26, with part of the circulating gas returning to the air inlet pipe of fan 1 7 through pipe 7 27 to preheat the fresh air, and the remaining tail gas is discharged; the control system monitors data through temperature sensors, pressure sensors and flue gas analyzers, and dynamically adjusts the gas inlet pipe 3 valve, the speed of fan 1 7, the speed of fan 2 29 and the opening of diversion valve 26 by PLC / DCS to achieve constant temperature output of hot air and compliant emission of pollutants.

[0074] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A high-efficiency circulating hot air furnace for phosphate fertilizer processing, characterized in that, include: Furnace body (1), a burner (2) connected to the inside is fixed on the left side surface of the furnace body (1), a gas inlet pipe (3) and an auxiliary air inlet pipe (4) connected to the inside are fixed on the front surface of the burner (2) from left to right, a partition plate (5) is fixed on the inner circumferential side of the furnace body (1), and a pipe (6) connected to the inside is fixed on the left side of the partition plate (5) on the upper surface of the furnace body (1), a fan (7) connected to the inside is fixed on the right side of the partition plate (5), and a pipe (8) connected to the inside is fixed on the right side of the furnace body (1). Two heat exchange shells (9) are installed sequentially from front to back in front of the furnace body (1). A flue gas inlet pipe (10) is fixedly connected to the right end of the upper surface of the heat exchange shell (9) and a flue gas outlet pipe (11) is fixedly connected to the left end of the lower surface of the heat exchange shell (9). A hot air inlet pipe (12) is fixedly connected to the left end of the upper surface of the heat exchange shell (9) and a hot air outlet pipe (13) is fixedly connected to the left of the flue gas outlet pipe (11) on the lower surface of the heat exchange shell (9). A pipe three (14) is fixedly connected between the flue gas outlet pipe (11) at the rear heat exchange shell (9) and the flue gas inlet pipe (10) at the front heat exchange shell (9). A pipe four (15) is fixedly connected to the hot air outlet pipe (13) at the rear heat exchange shell (9). A heat exchange mechanism (16) is provided inside the heat exchange shell (9). A purification mechanism (20) is provided on the left side of the furnace body (1).

2. The high-efficiency circulating hot air furnace for phosphate fertilizer processing according to claim 1, characterized in that, The heat exchange mechanism (16) includes two vertical plates (17) on the left and right, and a plurality of U-shaped heat exchange tubes (18) are fixedly connected through the two vertical plates (17). A horizontal plate (19) is fixedly connected to the left side surface of the left vertical plate (17).

3. The high-efficiency circulating hot air furnace for phosphate fertilizer processing according to claim 1, characterized in that, The purification mechanism (20) includes a cyclone dust collector (21), a purification tank (22), and an adsorbent tank (23). The air inlet end of the cyclone dust collector (21) is fixedly connected to a pipe five (24), and the air outlet end of the cyclone dust collector (21) is fixedly connected to a pipe six (25). The upper surface of the purification tank (22) is fixedly connected to a diversion valve (26) that communicates with its interior. One diversion end of the diversion valve (26) is fixedly connected to a pipe seven (27). The inner circumferential side of the purification tank (22) is fixedly connected to a filter plate (28). The upper surface of the adsorbent tank (23) is fixedly connected to a fan two (29). The air inlet end of the fan two (29) is fixedly connected to a pipe eight (30), and the air outlet end of the fan two (29) is fixedly connected to a pipe nine (31).

4. The high-efficiency circulating hot blast stove for phosphate fertilizer processing according to claim 1, characterized in that, One end of the first pipe (6) away from the furnace body (1) is fixed to the flue gas inlet pipe (10) at the rear heat exchange shell (9). One end of the second pipe (8) away from the furnace body (1) is fixed to the hot gas inlet pipe (12) at the front heat exchange shell (9). One end of the fourth pipe (15) away from the hot gas outlet pipe (13) is fixed to the combustion air inlet pipe (4), and the fourth pipe (15) is connected to the interior of the combustion air inlet pipe (4).

5. The high-efficiency circulating hot air furnace for phosphate fertilizer processing according to claim 2, characterized in that, Both vertical plates (17) are fixed to the inner circumferential side of the heat exchange shell (9). The flue gas inlet pipe (10) and flue gas outlet pipe (11) are located between the two vertical plates (17). The hot gas inlet pipe (12) and hot gas outlet pipe (13) are located to the left of the left vertical plate (17). One end of the U-shaped heat exchange tube (18) is located above the horizontal plate (19), and the other end of the U-shaped heat exchange tube (18) is located below the horizontal plate (19). The front, back and left surfaces of the horizontal plate (19) are fixed to the inner circumferential side of the heat exchange shell (9).

6. The high-efficiency circulating hot air furnace for phosphate fertilizer processing according to claim 3, characterized in that, The end of pipe five (24) away from the cyclone dust collector (21) is fixed to the flue gas outlet pipe (11) at the front heat exchange shell (9). The end of pipe six (25) away from the cyclone dust collector (21) is fixed to the lower end of the left side surface of the purification tank (22), and pipe six (25) is connected to the inside of the purification tank (22). Pipe eight (30) is fixed to the upper surface of the adsorbent tank (23). The end of pipe nine (31) away from the fan two (29) is fixed to the upper end of the left side surface of the purification tank (22), and pipe nine (31) is connected to the inside of the purification tank (22). The connection between pipe nine (31) and the purification tank (22) is located below the filter plate (28).

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