Drying furnace for ground phosphate rock pellets

Abstract

The utility model provides a ground phosphate rock pellet drying furnace, and belongs to the technical field of phosphorus chemical production equipment. According to the equipment, through the design of the material guide inclined plate, the problem that in the prior art, a phosphorite powder pellet sliding path is prone to being blocked is solved. The drying furnace is used for containing powdered rock phosphate pellets, heat energy is conveyed into the drying furnace through a heating device, and the contained powdered rock phosphate pellets are dried; a plurality of material guide inclined plates are fixedly mounted in the material guide plate; in the height direction of the ground phosphate rock pellet drying furnace, the multiple material guiding inclined plates are sequentially arranged at intervals from top to bottom, and every two vertically-adjacent material guiding inclined plates are arranged in a staggered mode. And the distance between the lower end of each material guide inclined plate and the inner wall of the ground phosphate rock pellet drying furnace is larger than the diameter of the ground phosphate rock pellet, and each material guide inclined plate is formed by arranging a plurality of round bars at intervals.

Description

Technical Field

[0001] This utility model belongs to the technical field of phosphorus chemical production equipment, and in particular relates to a phosphate rock powder pellet drying furnace. Background Technology

[0002] Phosphate rock powder pellets are a product made by processing phosphate rock powder into spherical shapes using a specific process. Currently, the production of yellow phosphorus involves high-grade phosphate rock, especially weathered phosphate rock, which generates a large amount of powder during processing and use. This powder must be pelletized before it can be used in yellow phosphorus production. In existing technologies, the production process of phosphate rock powder pellets includes batching, mixing, pelletizing, and drying. Drying is a crucial process in phosphate rock powder pellet production, and the drying equipment is the key piece of equipment in the phosphate rock powder drying process.

[0003] Chinese utility model patent application publication number CN112556318A discloses a high-efficiency drying device for phosphate rock powder pellet production. The structure of the drying device described in the patent is such that hot air is introduced into the heating pipe from the air inlet chamber on the right and discharged from the exhaust chamber on the left. The hot air is directly discharged, and the residence time in the drying section is short, resulting in poor heating effect on the pellets.

[0004] A mineral powder pellet drying device disclosed in Chinese Utility Model Patent No. CN215002793U features a design where hot air flows into the drying section from the upper row of heating troughs through an air inlet chamber. Because the upper row of heating troughs is blocked on one side of the exhaust chamber, the hot air can only flow downwards to the lower row of heating troughs and then out through the exhaust chamber. This design creates airflow turbulence between the upper and lower rows of heating troughs, allowing the hot air to remain in the drying section for a longer time and thus more thoroughly drying the pellets. Compared to Chinese Utility Model Patent No. CN112556318A, this drying process is more energy-efficient and effective. Furthermore, the hot air discharged from the exhaust chamber carries away the water vapor evaporated from the pellets, ensuring timely removal of the evaporated water vapor from the drying section and further improving the drying effect.

[0005] However, the technical solution described in the Chinese utility model patent with authorization announcement number CN215002793U has an inverted V-shaped structure in the longitudinal section of the guide plate in the material guiding section and the longitudinal section of the heating tank plate in the drying section. As production continues, the phosphate rock powder that enters the device along with the phosphate rock powder pellets gradually deposits on the guide plate and the heating tank plate, causing blockage in the material guiding section and the drying section. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a phosphate rock powder pellet drying furnace to solve the problem that the feeding section and drying section of the phosphate rock powder pellet drying device are prone to blockage as production continues.

[0007] To achieve the above and other related objectives, this utility model provides a phosphate rock powder pellet drying furnace for containing phosphate rock powder pellets. A heating device supplies heat to the furnace to dry the contained phosphate rock powder pellets. Multiple guide plates are fixedly installed inside the furnace. Along the height of the furnace, the guide plates are arranged sequentially from top to bottom at intervals, with adjacent guide plates staggered. Each guide plate is inclined downwards, and the distance from the lower end of the guide plate to the inner wall of the furnace is greater than the diameter of the phosphate rock powder pellets. The guide plates are composed of multiple spaced circular strips.

[0008] Optionally, a load-bearing beam is fixedly installed inside; the upper end of the guide plate is fixed to the inner wall of the phosphate rock powder pellet drying furnace, and the lower part of the guide plate overlaps the load-bearing beam.

[0009] Optionally, the drying oven is also connected to a dust removal device, and a cold air valve is provided at the dust removal port connected to the dust removal device.

[0010] Optionally, a second temperature sensor is also included, which controls the cold air valve to close via electrical connection when the temperature of the dust removal port is lower than a third set value, and controls the cold air valve to open via electrical connection when the temperature is higher than a fourth set value.

[0011] Optionally, it includes a feeding section, a drying section, and a discharging section arranged sequentially from top to bottom, with the guide plate disposed within the drying section.

[0012] Optionally, the interior of the drying section is provided with a heat insulation layer made of high-strength castable.

[0013] As described above, the phosphate rock powder pellet drying furnace of this utility model has at least the following beneficial effects:

[0014] This phosphate rock powder pellet drying furnace has multiple guide plates fixedly installed internally. Along the height of the furnace, these guide plates are spaced apart from top to bottom, with adjacent plates staggered. Each guide plate is downwardly inclined, and the distance from the lower end of the guide plate to the inner wall of the furnace is greater than the diameter of the phosphate rock powder pellets. The guide plates are designed with multiple spaced circular strips. After the phosphate rock powder pellets and phosphate rock powder enter the drying furnace, the pellets slide down one downwardly inclined guide plate to another adjacent, staggered guide plate until they leave the furnace. The phosphate rock powder falls through the gaps between the strips, preventing accumulation and blockage along the pellets' path. This solves the problem in existing technologies where, as production continues, phosphate rock powder entering the device with the pellets gradually deposits on the guide plates and heating troughs, causing blockages in the pellets' path. Attached Figure Description

[0015] Figure 1 The image shown is a side view of a phosphate rock powder pellet drying furnace according to this utility model.

[0016] Figure 2 This is a front view of the present invention.

[0017] Figure 3 The image shown is a top view of this utility model.

[0018] Figure 4 The diagram shown is a schematic of the burner of this utility model.

[0019] Component designation explanation

[0020] Drying oven 1, feeding section 11, drying section 12, unloading section 13, burner 2, first pneumatic shut-off valve 21, second pneumatic shut-off valve 22, flame nozzle 23, guide plate 3, load-bearing beam 4, insulation layer 5. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0022] Please see Figures 1 to 4It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0023] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0024] Please see Figure 1 and Figure 2 This utility model provides a phosphate rock powder pellet drying furnace 1, similar to the phosphate rock powder pellet drying device disclosed in Chinese utility model patent CN215002793U in the background art. This drying furnace 1 is used to hold phosphate rock powder pellets, and heat energy is supplied to its interior through a heating device to dry the held phosphate rock powder pellets. The difference between this drying furnace 1 and the prior art is that multiple guide plates 3 are fixedly installed inside the drying furnace 1. Along the height direction of the drying furnace 1, the multiple guide plates 3 are arranged sequentially from top to bottom at intervals, with adjacent guide plates 3 arranged alternately. For the specific form of the alternate arrangement, please refer to [link to relevant documentation]. Figure 1 Each of the guide plates 3 is inclined downwards, and the distance from the lower end of the guide plate 3 to the inner wall of the drying furnace 1 is greater than the diameter of the phosphate rock powder pellets, so as to ensure that the phosphate rock powder pellets fall smoothly from the upper guide plate 3 onto the lower guide plate 3. The guide plate 3 is composed of multiple round bars arranged at intervals.

[0025] After the phosphate rock powder pellets and phosphate rock powder enter the drying oven 1 from above, the phosphate rock powder pellets slide down along a downwardly inclined guide plate 3 onto another adjacent, staggered guide plate 3, until they leave the drying oven 1 from below; at the same time, the phosphate rock powder falls down along the gaps between the spaced circular bars, and will not accumulate on the path of the phosphate rock powder pellets and cause blockage. This solves the problem in the Chinese utility model patent with authorization announcement number CN215002793U, which discloses a mineral powder pellet drying device, in which, as production continues, the phosphate rock powder that enters the device with the phosphate rock powder pellets gradually deposits on the guide plate and heating tank plate, causing blockage on the path of the phosphate rock powder pellets.

[0026] In addition, the design of multiple round bars spaced apart allows the hollow part in the middle of the guide plate 3 to have space for thermal expansion. At the same time, the staff can quickly make the guide plate 3 of the appropriate size by adjusting the number of round bars according to the size of the drying oven 1.

[0027] In another implementation, please refer to Figure 1 and Figure 2 The drying furnace 1 has a load-bearing beam 4 fixedly installed inside. The load-bearing beam 4 is an H-beam. The upper end of the guide plate 3 is fixed to the inner wall of the drying furnace 1. The fixed connection method can be welding or other methods, which will not be elaborated here. The lower part of the guide plate 3 overlaps with the load-bearing beam 4. Generally, the lower surface of the lower part of the guide plate 3 overlaps with the load-bearing beam 4. The advantage of this design is that the guide plate 3 is subject to thermal expansion and contraction. When the temperature inside the drying furnace 1 rises, even if the guide plate 3 expands due to heat, the lower part of the guide plate 3 overlaps with the load-bearing beam 4. Therefore, the connection position of the guide plate 3 in this embodiment has space for thermal expansion. Compared with the method where both ends of the guide plate 3 are fixed, the probability of loosening of the guide plate 3 connection can be reduced, and the working reliability of this phosphate rock powder pellet drying furnace 1 can be improved.

[0028] In another embodiment, the drying oven 1 is also connected to a dust removal device to further reduce the dust generated by the equipment. Since the burner 2 is arranged at the bottom of the drying oven 1, the dust removal device can be arranged at the top of the drying oven 1. This not only avoids interference between different components, but more importantly, since phosphate rock powder floats upward, the dust removal device arranged at the top of the drying oven 1 can better remove dust. At the same time, in order to prevent the high-temperature gas inside the drying oven 1 from damaging the filter bags of the dust removal device, a cold air valve is installed at the dust removal port connected to the dust removal device.

[0029] In another implementation, please refer to Figure 1 and Figure 2 The drying oven 1 includes a feeding section 11, a drying section 12, and a discharging section 13 arranged sequentially from top to bottom.

[0030] The feed section 11 can be as follows: Figure 1 The feeding hopper shown can also be the same as the feeding section described in the specification of Chinese Utility Model Patent No. CN215002793U, or other shapes.

[0031] The drying section 12 can be made of, for example Figure 1 and Figure 2 The unit consists of multiple drying sections connected by flanges. The guide plate 3 is installed inside the drying section 12, and the burner 2's nozzle 23 is connected to the interior of the drying section 12.

[0032] The feeding section 13 can also be the same as the feeding section described in the specification of Chinese Utility Model Patent No. CN215002793U. For the specific structure of the feeding section, please refer to paragraphs 0048-0052 of the specification of that utility model.

[0033] In another implementation, please refer to Figure 1 and Figure 2 The drying section 12 is equipped with a heat insulation layer 5 made of high-strength castable to effectively ensure the temperature inside the drying oven 1. High-strength castable is an unshaped refractory material with good fluidity and stability, which is made by adding a certain amount of binder to refractory materials and is constructed by casting. High-strength castable is usually composed of high-strength aggregate, powdered mineral additives and binders.

[0034] In another implementation, please refer to Figure 1 and Figure 3 The heating device is a burner 2, whose nozzle 23 is directly connected to the interior of the drying oven 1, spraying flames below the guide plate 3. The space below the guide plate 3 provides sufficient space for the combustion of phosphate rock powder pellets and phosphate rock powder. The phosphate rock powder pellets falling from one guide plate 3 to another are directly baked by the flames sprayed from the nozzle 23 of the burner 2. Compared with indirect hot air baking, this method not only has lower energy consumption and cost, but also allows the direct baking of the flames to quickly remove the moisture on the surface of the phosphate rock powder pellets, thereby forming a relatively dry outer shell on the surface of the phosphate rock powder pellets. This prevents the internal moisture of the phosphate rock powder pellets from diffusing outward and eroding the surface of the pellets, ultimately producing higher quality phosphate rock powder pellets.

[0035] In addition, because the flames directly ejected from the burner 2 nozzle 23 not only bake the phosphate rock powder pellets, they also directly ablate the falling phosphate rock powder, causing the phosphate rock powder to adhere to the phosphate rock powder pellets, thus reducing dust generated during production.

[0036] The Chinese utility model patent with authorization announcement number CN215002793U discloses a mineral powder pellet drying device that produces 200 tons of phosphate rock powder pellets. The amount of yellow phosphorus tail gas used in this device can produce 960 to 1200 tons, that is, 40 to 50 tons per hour.

[0037] In another implementation, please refer to Figure 1 Because the heat generated by combustion moves upward, the nozzle 23 of the burner 2 is connected to the lower part of the guide plate 3 of the drying oven 1, which further improves the energy utilization efficiency.

[0038] In another implementation, please refer to Figure 2 and Figure 3There are multiple burners 2, which are arranged separately on opposite sides of the drying furnace 1. Specifically, the design can be as follows: two burner nozzles 23 are arranged below the bottom guide plate 3 of the drying furnace 1, with these two nozzles 23 on one side; two burner nozzles 23 are arranged between the two bottom guide plates 3 of the drying furnace 1, with these two nozzles 23 on the other side; to ensure sufficient drying of phosphate rock powder pellets.

[0039] In another embodiment, in order to accurately control the burner 2 and the cold air valve mentioned above, this phosphate rock powder pellet drying equipment further includes:

[0040] The first temperature sensor detects that when the temperature on the guide plate 3 is lower than the first set value, it controls the burner 2 to increase the flame through an electrical connection; when it is higher than the second set value, it controls the burner 2 to decrease the flame through an electrical connection; the first set value is less than the second set value, specifically, the first set value is 450°C and the second set value is 550°C.

[0041] The second temperature sensor detects that when the temperature of the dust removal port is lower than the third set value, it controls the cold air valve to close via electrical connection; when it is higher than the fourth set value, it controls the cold air valve to open via electrical connection; the third set value is less than the fourth set value, specifically, the third set value is 80℃ and the fourth set value is 120℃.

[0042] In another implementation, please refer to Figure 4 The burner 2 has a first pneumatic shut-off valve 21 and a second pneumatic shut-off valve 22 connected in series. When the gas pressure in the burner 2 is lower than 1000Pa, or when the nozzle 23 of the burner 2 does not emit flame, the first pneumatic shut-off valve 21 and the second pneumatic shut-off valve 22 simultaneously cut off the gas supply. Through the design of the two-stage pneumatic shut-off valve, the safety of this phosphate rock powder pellet drying equipment is significantly improved.

[0043] In another implementation, please refer to Figure 1 The burner 2 has a flat nozzle 23, which ensures that the flame is longer and can more easily dry the phosphate rock powder pellets in the space below the guide plate 3.

[0044] In other implementations, such as Figure 2 As shown, the gap between the two round bars should achieve the following technical effect: phosphate rock powder pellets with a diameter greater than 5mm should not fall through the gap, but should slide down one guide plate 3 to the next guide plate 3, until they slide down to the feeding section 13. After being dried in the drying oven 1, the phosphate rock powder pellets that meet the requirements will enter the next process, while those with smaller diameters that do not meet the requirements will be sent back to the molding machine to ensure the full utilization of the phosphate rock powder.

[0045] In summary, this utility model features multiple guide plates 3 internally fixedly installed. Along the height of the phosphate rock powder pellet drying furnace 1, these guide plates 3 are arranged sequentially from top to bottom at intervals, with adjacent guide plates 3 staggered. Each guide plate 3 is inclined downwards, and the distance from the lower end of the guide plate 3 to the inner wall of the phosphate rock powder pellet drying furnace 1 is greater than the diameter of the phosphate rock powder pellets. The guide plate 3 is designed with multiple circular strips arranged at intervals, ensuring smooth flow of phosphate rock powder pellets and phosphate rock powder as they enter the furnace. After entering the drying oven 1, the phosphate rock powder pellets slide down a downward-sloping guide plate 3 onto another adjacent, staggered guide plate 3, until they leave the drying oven 1. The phosphate rock powder, however, falls through the gaps between the round bars, preventing accumulation and blockage along the path of the phosphate rock powder pellets. This solves the problem in existing technologies where, as production continues, the phosphate rock powder entering the device along with the pellets gradually deposits on the guide plates and heating tank plates, causing blockages in the pellets' sliding path. Therefore, this invention effectively overcomes the shortcomings of existing technologies and has high industrial application value.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A phosphate rock powder pellet drying oven, used for containing phosphate rock powder pellets, and for drying the contained phosphate rock powder pellets by supplying heat energy to the interior through a heating device, characterized in that: Multiple guide plates are fixedly installed inside; along the height direction of the phosphate rock powder pellet drying furnace, the multiple guide plates are arranged at intervals from top to bottom, and the two adjacent guide plates are arranged alternately. Each of the aforementioned guide plates is inclined downwards, and the distance from the lower end of the guide plate to the inner wall of the phosphate rock powder pellet drying furnace is greater than the diameter of the phosphate rock powder pellets. The guide plate is composed of multiple circular strips arranged at intervals.

2. The phosphate rock powder pellet drying furnace according to claim 1, characterized in that: The interior is fixedly equipped with a load-bearing beam; the upper end of the guide plate is fixed to the inner wall of the phosphate rock powder pellet drying furnace, and the lower part of the guide plate overlaps the load-bearing beam.

3. The phosphate rock powder pellet drying furnace according to claim 1, characterized in that: The drying oven is also connected to a dust removal device, and a cold air valve is installed at the dust removal port connected to the dust removal device.

4. A phosphate rock powder pellet drying furnace according to claim 3, characterized in that, Also includes: The second temperature sensor, when detecting that the temperature of the dust removal port is lower than the third set value, controls the cold air valve to close via electrical connection; when it is higher than the fourth set value, it controls the cold air valve to open via electrical connection.

5. A phosphate rock powder pellet drying furnace according to claim 1, characterized in that: It includes a feeding section, a drying section and a discharging section arranged sequentially from top to bottom, with the guide plate disposed in the drying section.

6. A phosphate rock powder pellet drying furnace according to claim 5, characterized in that: The drying section is equipped with an insulation layer made of high-strength castable.

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