Ammonium sulfate drying device
By using vacuum radio frequency drying technology and a closed structure design, the problems of high energy consumption and dust overflow in the ammonium sulfate drying process have been solved, achieving low-carbon drying and environmental protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-17
AI Technical Summary
The existing ammonium sulfate drying process suffers from high energy consumption, significant heat loss, severe equipment corrosion, and dust spillage, which affect environmental hygiene and operational safety.
By employing vacuum radio frequency drying technology and a sealed structure design, combined with a temperature detection and control system, rapid drying and sealed treatment of ammonium sulfate crystals can be achieved.
Significantly reduces energy consumption, eliminates fly ash from fine ammonium sulfate particles, prevents equipment corrosion, and achieves low-carbon drying and environmental protection.
Smart Images
Figure CN224004160U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the chemical industry, and in particular to an ammonium sulfate drying device. Background Technology
[0002] In the process of purifying the raw coal gas produced by coking plants, ammonia in the coal gas is absorbed by sulfuric acid to produce ammonium sulfate. Ammonium sulfate drying is a necessary process step for the final formation of ammonium sulfate crystals. After crystallization in an ammonium sulfate crystallizer and dehydration in a centrifuge, the moisture content of ammonium sulfate, which is 2.5%, needs to be dried to below 0.2%. Usually, hot air that has exchanged heat with steam is passed into a auger conveyor for direct heat exchange and drying of ammonium sulfate. Through two heat exchange processes, there is a large amount of heat loss, resulting in high energy consumption. At the same time, the direct contact between hot air and ammonium sulfate crystals causes serious fly ash, resulting in a poor working environment and corrosion of equipment, walls, and floor tiles.
[0003] In the article "Optimization of Ammonium Sulfate Drying Process" published in the 15th issue of Chemical Industry Management in 2023, author Tang Xinliang discussed the following issues related to ammonium sulfate dust overflow during the drying process: 1) Inadequate sealing of the drying bed manhole: During the operation of the drying system, the manhole of the drying bed has a fixed rotating shaft on one side and three quick-fixing bolts on the entire surface. Due to frequent opening and closing of the manhole, the fixing bolts age and come loose, resulting in inadequate sealing of the manhole. This leads to the loss and waste of air volume during the drying process and an increase in indoor air temperature. Ammonium sulfate dust escapes from the poorly sealed manhole, causing dust to float throughout the room, resulting in environmental pollution and harming the physical and mental health of employees. 2) Inadequate sealing of the drying bed air duct: The air duct of the drying bed is connected with canvas. Under long-term high-temperature operation, the canvas gradually hardens, eventually causing gaps at the joints and inadequate sealing. During the operation of the drying system, tiny ammonium sulfate dust particles are carried out by the wind from the joints, causing dust overflow, corrosion of on-site equipment, and affecting environmental hygiene. Utility Model Content
[0004] The purpose of this invention is to provide an ammonium sulfate drying device that reduces the loss of ammonium sulfate products, avoids poor operating environment and large-area corrosion of equipment, walls, floor tiles, etc., and achieves low-carbon drying of ammonium sulfate.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] An ammonium sulfate drying device includes an ammonium sulfate crystallizer, a centrifuge, a grate screen, an ammonium sulfate solution storage tank, a dryer, and an ammonium sulfate finished product silo. The discharge port of the ammonium sulfate crystallizer is connected to the feed port of the grate screen via a pipeline. The upper end of the grate screen is connected to the feed port of the centrifuge via a pipeline. The lower part of the grate screen is connected to the ammonium sulfate solution storage tank via a pipeline. The ammonium sulfate solution storage tank is pumped into the ammonium sulfate crystallizer by a water pump. The discharge port of the centrifuge is connected to the feed port of the dryer via a pipeline. The discharge port of the dryer is connected to the feed port of the finished product silo via a pipeline.
[0007] It also includes a temperature detector, which is inserted into the material at the feed inlet of the finished product warehouse.
[0008] The dryer is an RF dryer.
[0009] Compared with the prior art, the beneficial effects of this utility model are:
[0010] The rapid drying of crystalline ammonium sulfate is achieved through vacuum radio frequency drying technology. The ammonium sulfate crystals are left to dry and drain on a grate screen, which greatly reduces energy consumption. The ammonium sulfate drying device adopts a closed structure, which completely eliminates the phenomenon of fly ash from the fine particles of ammonium sulfate, reduces the loss of ammonium sulfate products, and avoids large-scale corrosion of walls and floor tiles, thus achieving low-carbon drying of ammonium sulfate. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of an ammonium sulfate drying device.
[0012] In the diagram: 1-Water pump; 2-Ammonium sulfate solution storage tank; 3-Ammonium sulfate crystallizer; 4-Grate screen; 5-Centrifuge; 6-Radio frequency dryer; 7-Control system; 8-Temperature detector; 9-Ammonium sulfate finished product warehouse. Detailed Implementation
[0013] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.
[0014] An ammonium sulfate drying device includes an ammonium sulfate crystallizer, a centrifuge 5, a grate screen 4, a water pump 1, an ammonium sulfate solution storage tank 2, a dryer 6, a temperature measuring instrument, a control system 7, and an ammonium sulfate finished product silo 9. The outlet of the ammonium sulfate crystallizer is connected to the inlet of the grate screen 4. The upper end of the grate screen 4 is connected to the inlet pipe of the centrifuge 5. The lower part of the grate screen 4 is connected to the ammonium sulfate solution storage tank 2 through a pipe. The ammonium sulfate solution storage tank 2 draws the solution into the ammonium sulfate crystallizer 3 through the water pump 1. The outlet of the centrifuge 5 is connected to the inlet of the dryer 6 through a pipe. The outlet of the dryer 6 is connected to the inlet of the finished product silo through a pipe. The dryer 6 is a radio frequency dryer 6.
[0015] Work process:
[0016] Ammonium sulfate crystals are dried and drained through a grate screen 4, then further dehydrated in a centrifuge 5, and finally dried in an RF dryer 6; the temperature at the feed inlet of the finished product silo is controlled between 100 and 120°C. The set grate screen 4 prevents the ammonium sulfate solution from flowing into the finished product silo after the ammonium sulfate crystal layer in the ammonium sulfate crystallizer 3 is emptied, thus preventing the ammonium sulfate drying system from paralyzing. The screen mesh can be selected from 200 mesh, 180 mesh, or 110 mesh to prevent excessively fine (<74um) ammonium sulfate particles from entering the finished product silo and affecting the quality of the finished ammonium sulfate product. The grate screen 4 is at an angle of 45° to 75° to the horizontal, intercepting and retaining ammonium sulfate crystals. Through brief drying and drainage, the moisture content of the ammonium sulfate entering the drying system is reduced, thereby reducing the drying energy consumption of the drying system. The temperature detector 8 is inserted into the material at the inlet of the finished product silo to detect the temperature at the outlet of the dryer 6. The control system 7 receives the temperature at the outlet of the dryer 6 transmitted by the temperature detector 8 and issues instructions to adjust the working power of the dryer 6, as follows:
[0017] When the temperature at the outlet of dryer 6 is greater than the target temperature range, control system 7 controls dryer 6 to reduce its operating frequency by 50 kWh to 500 kWh; when the temperature at the outlet of dryer 6 is less than the target temperature range, control system 7 controls dryer 6 to increase its operating frequency by 50 kWh to 500 kWh; when the temperature at the outlet of dryer 6 is within the target temperature range, control system 7 maintains the operating power of dryer 6 unchanged.
[0018] See Figure 1 The ammonium sulfate crystals at the bottom of the ammonium sulfate crystallizer 3 are dried and drained through the grate screen 4. The solution passes through the screen into the ammonium sulfate solution storage tank 2. The ammonium sulfate crystals on the upper part of the grate screen 4 then enter the centrifuge 5 for further dehydration, and then enter the radio frequency dryer 6 for drying. After drying, they enter the ammonium sulfate finished product warehouse 9. When the temperature measuring instrument shows a temperature of 30℃, the control system 7 issues a command to increase the working power of the dryer 6 by 100kwh. At this time, the temperature measuring instrument still shows a temperature of 70℃. The controller issues a command to increase the working power of the dryer 6 by 100kwh to continue increasing the drying temperature inside the dryer 6. At this time, the temperature measuring instrument shows a temperature of 100℃, which is within the target temperature range. The control system 7 maintains the current working power of the dryer 6.
[0019] This invention achieves rapid drying of crystalline sodium sulfate using vacuum radio frequency drying technology. Ammonium sulfate crystals are left to dry and drain on a grate screen, significantly reducing energy consumption. The ammonium sulfate drying device adopts a closed structure, completely eliminating the phenomenon of fly ash from tiny ammonium sulfate particles, reducing the loss of ammonium sulfate products, and avoiding large-scale corrosion of walls and floor tiles, thus achieving low-carbon drying of ammonium sulfate.
Claims
1. An ammonium sulfate drying apparatus characterized by comprising: The ammonium sulfate crystallizer, centrifuge, grating screen, ammonium sulfate solution storage tank, dryer and ammonium sulfate product bin are connected by pipelines.
2. An ammonium sulfate drying apparatus according to claim 1, characterized by The temperature detector is inserted into the material in the feed inlet of the product bin.
3. An ammonium sulfate drying apparatus according to claim 1, wherein The dryer is a radio frequency dryer.