Drying device for magnesium chloride production
By combining a horizontal dryer, a cyclone separator, and an alkaline scrubbing tower, the problems of high energy consumption, serious pollution, and dust in existing magnesium chloride drying equipment have been solved, achieving efficient drying and environmentally friendly magnesium chloride production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-10
AI Technical Summary
Existing magnesium chloride drying equipment is energy-intensive, generates secondary pollution, and the dust affects the equipment's lifespan, resulting in low drying efficiency.
A horizontal dryer is combined with a cyclone separator, a bag filter, and an alkaline scrubbing tower. The cyclone separator recovers magnesium chloride entrained in the steam, the bag filter collects dust, and the alkaline scrubbing tower treats acidic gases. The waste heat from the exhaust gas is used to reduce energy consumption, thereby achieving gas-solid separation and pollutant removal.
It improves the drying efficiency of magnesium chloride, reduces energy consumption, reduces environmental pollution, protects equipment, and achieves efficient purification of exhaust gas and recycling of resources.
Smart Images
Figure CN223980332U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of magnesium chloride production technology, specifically to a magnesium chloride production drying device. Background Technology
[0002] Magnesium chloride is an inorganic compound with the chemical formula MgCl2. It appears as colorless, flaky crystals, is slightly soluble in acetone, and soluble in water, ethanol, methanol, and pyridine. Currently, magnesium chloride is mainly produced from brine, a byproduct of seawater salt production. This brine is concentrated into a carnallite solution, cooled to remove potassium chloride, and then concentrated, filtered, cooled, crystallized, filtered again, and dried. Hot air drying, fluidized bed drying, or spray drying are commonly used to quickly remove moisture from the material and improve drying efficiency. However, existing drying equipment has the following drawbacks: 1. The drying process requires a large amount of heat energy, especially when processing high-humidity materials, resulting in high energy consumption; 2. Hydrogen chloride gas is generated during the drying process, which, if not properly handled, can cause secondary pollution to the environment; 3. During the drying process, magnesium chloride easily generates dust, which not only reduces equipment lifespan but may also adhere to pipes and equipment surfaces, affecting heat exchange efficiency. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a magnesium chloride production drying device that addresses the shortcomings of the existing technology. This device not only has high drying efficiency, but also recovers and reuses the steam generated during the drying process, which not only reduces energy consumption, but also reduces secondary pollution of the exhaust gas.
[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:
[0005] A magnesium chloride production drying apparatus includes a horizontal dryer. The outlet of the horizontal dryer is sequentially connected to a cyclone separator and a bag filter. The solid outlet of the cyclone separator and the material outlet of the horizontal dryer are both connected to a product storage tank. The gas outlet of the bag filter is connected to an alkaline scrubbing tower. A hydrogen chloride detector is installed at the outlet of the alkaline scrubbing tower. The outlet of the alkaline scrubbing tower is connected to the heat exchange medium inlet of the horizontal dryer through a first gas pipeline, a first electric valve, and a first fan. The outlet of the alkaline scrubbing tower is connected to the inlet of the alkaline scrubbing tower through a second gas pipeline, a second electric valve, and a second fan. The first electric valve, the first fan, the second electric valve, and the second fan are interlocked with the hydrogen chloride detector. A drying tank, a filter tank, and a heater are also installed on the first gas pipeline.
[0006] Preferably, the feed inlet of the horizontal dryer is provided with a feed hopper.
[0007] Preferably, the horizontal dryer is provided with a stirring mechanism, which includes a stirring shaft rotatably disposed within the horizontal dryer and spiral stirring blades disposed on the stirring shaft. The stirring shaft is electrically connected to a stirring motor disposed on one side of the horizontal dryer.
[0008] Preferably, the inner wall of the horizontal dryer is also provided with multiple lifting plates.
[0009] Preferably, the drying container is filled with a desiccant.
[0010] Preferably, the filter tank is provided with multiple layers of filter screens.
[0011] Preferably, the heater is equipped with an electric heating element.
[0012] Preferably, the inner wall of the alkaline washing tower is provided with multiple baffles.
[0013] Preferably, the alkaline washing tower is provided with a packing layer.
[0014] Preferably, a wire mesh demister is provided at the outlet of the alkaline washing tower.
[0015] By adopting the above technical solution, this utility model has at least the following beneficial effects:
[0016] This invention provides a drying device for magnesium chloride production. The device includes a horizontal dryer for initial drying of wet magnesium chloride, a cyclone separator for rapid separation and recovery of magnesium chloride particles carried by steam, improving product collection efficiency, a bag filter for further capturing fine dust to ensure the cleanliness of the exhaust gas, reduce environmental pollution, and achieve efficient gas-solid separation, and an alkaline scrubbing tower for effectively treating acidic gases, especially hydrogen chloride, in the exhaust gas. Through alkaline neutralization, the concentration of pollutants in the exhaust gas is reduced, meeting environmental emission standards and reducing air pollution.
[0017] The hydrogen chloride detector in this device can monitor the hydrogen chloride content in the exhaust gas in real time. When the hydrogen chloride content is low, the first electric valve and the first fan open, and the purified gas is introduced into the heat exchange medium inlet of the horizontal dryer to recover and utilize the waste heat of the exhaust gas. If the hydrogen chloride content in the exhaust gas exceeds the standard, the second electric valve and the second fan open, so that the exhaust gas is recirculated in the alkaline scrubbing tower, further improving the scrubbing effect and reducing energy consumption and operating costs.
[0018] The desiccant in the drying tank of this device removes moisture from the exhaust gas, preventing moisture from entering the horizontal dryer and affecting the drying effect of magnesium chloride; the multi-layer filter screen in the filter tank filters impurities in the exhaust gas, protecting the equipment; the electric heating element of the heater increases the temperature of the exhaust gas, enhancing its effectiveness as a heat exchange medium and improving the drying efficiency.
[0019] The stirring mechanism of this device stirs and conveys the material, and the lifting plates can turn the wet material over, so that the material is heated evenly during the drying process, avoiding local overheating or uneven drying, and improving drying quality and efficiency.
[0020] The combined arrangement of baffles and packing layers in the alkaline scrubbing tower of this device increases the contact time between the gas and the alkaline solution, effectively improving the scrubbing tower's efficiency in removing pollutants. A wire mesh demister is installed at the gas outlet of the alkaline scrubbing tower to remove mist droplets from the exhaust gas, further purifying it. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;
[0023] Figure 2 This is a schematic diagram of the internal structure of the horizontal dryer in Example 1;
[0024] In the diagram, 1. Horizontal dryer; 2. Feed hopper; 3. Cyclone separator; 4. Bag filter; 5. Product storage tank; 6. Alkali washing tower; 7. Hydrogen chloride detector; 8. First gas pipeline; 9. First electric valve; 10. First fan; 11. Second gas pipeline; 12. Second electric valve; 13. Second fan; 14. Drying tank; 15. Filter tank; 16. Heater; 17. Desiccant; 18. Filter screen; 19. Electric heating element; 20. Stirring shaft; 21. Spiral stirring blades; 22. Stirring motor; 23. Lifting plate; 24. Baffle plate; 25. Packing layer; 26. Wire mesh demister. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0026] Example 1
[0027] like Figure 1 and 2As shown in the diagram, a magnesium chloride production drying apparatus includes a horizontal dryer 1. The horizontal dryer 1 has a feed hopper 2 at its inlet, through which wet magnesium chloride to be dried is added. The outlet of the horizontal dryer 1 is sequentially connected to a cyclone separator 3 and a bag filter 4. The steam generated during the drying process is separated by the cyclone separator 3 and then treated by the bag filter 4. Both the solid outlet of the cyclone separator 3 and the outlet of the horizontal dryer 1 are connected to a product storage tank 5. The cyclone separator 3 removes dust from the steam. The entrained magnesium chloride is separated and recovered to improve the magnesium chloride product yield. The gas outlet of the bag filter 4 is connected to an alkaline scrubbing tower 6. A hydrogen chloride detector 7 is installed at the gas outlet of the alkaline scrubbing tower 6. The gas outlet of the alkaline scrubbing tower 6 is connected to the heat exchange medium inlet of the horizontal dryer 1 through a first gas pipeline 8, a first electric valve 9, and a first fan 10. The gas outlet of the alkaline scrubbing tower 6 is connected to the gas inlet of the alkaline scrubbing tower 6 through a second gas pipeline 11, a second electric valve 12, and a second fan 13. An electric valve 9, a first fan 10, a second electric valve 12, and a second fan 13 are interlocked with a hydrogen chloride detector 7. A drying tank 14, a filter tank 15, and a heater 16 are also installed on the first gas pipeline 8. The drying tank 14 is filled with a desiccant 17, the filter tank 15 contains multiple layers of filter screens 18, and the heater 16 contains electric heating elements 19. The gas separated by the bag filter 4 is detected by the hydrogen chloride detector 7. If the hydrogen chloride concentration in the gas is lower than a set value, a signal is transmitted to an external control system (not shown in the figure). The external control system automatically opens the first electric valve 9 and the second fan 13. After the gas is dried by the drying tank 14, filtered by the filter tank 15, and heated by the heater 16, it finally enters the heat exchange medium inlet of the horizontal dryer 1 to heat and dry the wet product inside the horizontal dryer 1, reducing energy consumption. If the hydrogen chloride concentration in the gas is higher than a set value, the external control system automatically opens the second electric valve 12 and the second fan 13, and the gas re-enters the alkaline scrubbing tower 6 for absorption treatment, improving the tail gas treatment efficiency.
[0028] Furthermore, in this embodiment, the horizontal dryer 1 is equipped with a stirring mechanism, which includes a stirring shaft 20 rotatably disposed within the horizontal dryer 1 and spiral stirring blades 21 disposed on the stirring shaft 20. The stirring shaft 20 is electrically connected to a stirring motor 22 disposed on one side of the horizontal dryer 1. By stirring the material through the stirring mechanism, it is ensured that the magnesium chloride material is heated evenly during the drying process, avoiding the problems of local overheating or uneven drying, and improving drying efficiency and product quality.
[0029] Furthermore, in this embodiment, the inner wall of the horizontal dryer 1 is also provided with a plurality of lifting plates 23. The lifting plates 23 can further promote the turning and mixing of magnesium chloride material in the horizontal dryer 1, which helps to accelerate the drying speed and improve the drying uniformity.
[0030] Furthermore, in this embodiment, the inner wall of the alkaline scrubbing tower 6 is provided with multiple baffles 24. The baffles 24 can prolong the residence time of the gas in the alkaline scrubbing tower 6, increase the contact area and contact time between the gas and the alkaline solution, thereby improving the absorption efficiency of harmful gases in the gas.
[0031] Furthermore, in this embodiment, the alkaline washing tower 6 is provided with a packing layer 25, which further increases the contact area between the gas and the alkaline solution, promotes the full mixing and reaction of the gas and the alkaline solution, and improves the washing effect.
[0032] Furthermore, in this embodiment, a wire mesh demister 26 is provided at the gas outlet of the alkaline scrubbing tower 6 to effectively capture and remove tiny droplets entrained in the gas, avoid secondary pollution, reduce alkaline loss, and ensure the cleanliness of the exhaust gas and the economic efficiency of equipment operation.
[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A magnesium chloride production drying apparatus comprising a horizontal dryer, characterized by: The gas outlet of the horizontal dryer is sequentially communicated with a cyclone separator and a bag-type dust collector; the solid outlet of the cyclone separator and the discharge outlet of the horizontal dryer are both communicated with a product storage tank, and the gas outlet of the bag-type dust collector is communicated with an alkali liquid washing tower; a hydrogen chloride detector is arranged at the gas outlet of the alkali liquid washing tower; the gas outlet of the alkali liquid washing tower is communicated with the heat exchange medium inlet of the horizontal dryer through a first gas pipeline, a first electric valve and a first fan; the gas outlet of the alkali liquid washing tower is communicated with the gas inlet of the alkali liquid washing tower through a second gas pipeline, a second electric valve and a second fan; the first electric valve, the first fan, the second electric valve and the second fan are respectively connected with the hydrogen chloride detector in a interlocking manner; and a drying tank, a filtering tank and a heater are further arranged on the first gas pipeline.
2. The device for producing dry magnesium chloride according to claim 1, characterized in that: The feeding port of the horizontal dryer is provided with a feeding hopper.
3. The device for producing dry magnesium chloride according to claim 1, characterized in that: The horizontal dryer is internally provided with a stirring mechanism, which comprises a stirring shaft rotatably arranged in the horizontal dryer and spiral stirring blades arranged on the stirring shaft, and the stirring shaft is electrically connected with a stirring motor arranged on one side of the horizontal dryer.
4. The device for producing dry magnesium chloride according to claim 1, characterized in that: A plurality of scoops are further arranged on the inner wall of the horizontal dryer.
5. The device for producing dry magnesium chloride according to claim 1, characterized in that: The drying tank is filled with a drying agent.
6. The device for producing dry magnesium chloride according to claim 1, characterized in that: A plurality of filter screens are arranged in the filtering tank.
7. The device for producing dry magnesium chloride according to claim 1, characterized in that: An electric heating sheet is arranged in the heater.
8. The device for producing dry magnesium chloride according to claim 1, characterized in that: A plurality of baffles are arranged on the inner wall of the alkali liquid washing tower.
9. The device for producing dry magnesium chloride according to claim 1, characterized in that: A filler layer is arranged in the alkali liquid washing tower.
10. The device for producing dry magnesium chloride according to claim 1, characterized in that: A wire mesh demister is arranged at the gas outlet of the alkali liquid washing tower.