Drying system
By designing a drying system integrating crushing, drying and grading, the problems of difficulty in drying and agglomeration of gypsum filter cakes in phosphorus chemical production are solved, and rapid drying of gypsum and high-quality products are achieved.
Patent Information
- Application Number
- CN202420134085.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-01-19
AI Technical Summary
During the phosphorus chemical production process, the gypsum filter cake is difficult to dry, the drying rate is slow and prone to agglomeration, resulting in uneven product particle size.
A drying system integrating crushing, drying and grading is designed, including a crusher, a classifier and a collector. By controlling the drying temperature and time, the drying effect and product quality of the gypsum are ensured.
The rapid drying of gypsum is achieved, and the agglomeration phenomenon is avoided. The obtained gypsum has a small particle size and uniform particle size distribution, meeting the requirements of high-quality products.
Smart Images
Figure CN222438312U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of phosphorus chemical industry, in particular to a drying system. Background Art
[0002] Phosphorus chemical production is a complex chemical process, which mainly includes the beneficiation of phosphate ore, phosphoric acid process, preparation and processing of phosphides, etc. The following is the specific production process:
[0003] Phosphate ore beneficiation: Phosphate ore is an important phosphorus resource, mainly found in phosphate ore. The purpose of the beneficiation process is to extract the main component of phosphate ore, namely phosphate, from phosphate ore. Ore beneficiation is mainly carried out through ore crushing, slurry separation, flotation and other processes. After the ore is crushed and magnetically separated, the obtained ore slurry is separated by a flotation machine, and finally the phosphorus in the phosphate is obtained;
[0004] Phosphoric acid process: The phosphate obtained after phosphate ore beneficiation needs to be processed into phosphoric acid. This process is usually carried out under high temperature and high pressure conditions and requires the use of chemical reagents such as sulfuric acid. Phosphoric acid is an important intermediate product in phosphorus chemical production and can be further processed into various phosphorus chemical products;
[0005] Preparation and processing of phosphides: Phosphides are another important product in phosphorus chemical production, which can be used to manufacture various organic phosphorus compounds and phosphorus pesticides. The main methods for preparing phosphides are oxidation, reduction and chlorination. The processed phosphides can be further made into various phosphorus chemical products, such as phosphate esters, phosphoric acid amides, etc.
[0006] In the phosphorus chemical production process, a large number of by-products are gypsum filter cakes. The chemical composition of gypsum is calcium sulfate. Gypsum filter cakes are filter cakes obtained after filter pressing, which have the disadvantages of being difficult to dry, having a slow drying rate, and being easy to agglomerate during the drying process.
[0007] Therefore it is necessary to provide a drying system. Utility Model Content
[0008] In order to overcome the deficiencies of the prior art, the utility model provides a drying system, which has a fast drying speed, is not likely to cause gypsum agglomeration during the drying process, and has a small gypsum particle size.
[0009] The technical solution adopted by the utility model to solve its technical problems is:
[0010] A drying system includes a pulverizer having a drying function, a classifier connected to the pulverizer, and a collector to which the classifier is connected;
[0011] The classifier comprises a feed port, a throwing port and a material dividing port;
[0012] The pulverizer is connected to the feed port of the classifier; the throwing port of the classifier is connected to the pulverizer; and the material distribution port of the classifier is connected to the collector.
[0013] Preferably, the pulverizer is provided with an induced draft fan.
[0014] Preferably, an induced draft fan is provided on the material distribution port of the classifier.
[0015] Preferably, the collector is connected to a feeder, and the feeder is connected to a bucket elevator.
[0016] Preferably, the drying temperature of the pulverizer with drying function is 85°C.
[0017] Preferably, the collector is a bag dust collector.
[0018] Preferably, a feed buffer bin is provided in the pulverizer; the feed buffer bin is connected to a steam heat exchanger.
[0019] More preferably, the steam heat exchanger output temperature is 185°C.
[0020] More preferably, the bucket elevator is connected to a finished product buffer bin; the finished product buffer bin is used to store finished gypsum.
[0021] More preferably, the finished gypsum has a d50 of ≤25 μm and a moisture content of ≤0.2%.
[0022] The beneficial effects of the utility model are:
[0023] 1. The drying system described in the present application is highly efficient, integrating crushing, drying and grading, and has efficient drying capacity while ensuring uniform particle size distribution of the product; the drying system described in the present application has a fast drying speed, high output, and a thermal efficiency of more than 70%.
[0024] 2. The drying system described in this application can produce high-quality products; the drying system ensures the drying effect and product quality of the gypsum by controlling the drying temperature and time; the d50 of the finished gypsum is ≤25μm and the moisture content is ≤0.2%, which meets the requirements of high-quality products. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0026] Figure 1 is a structural schematic diagram of the drying system;
[0027] Figure 2 is a schematic diagram of the structure of a classifier in the drying system;
[0028] Figure 3It is a structural schematic diagram of the material flow of the drying system;
[0029] Among them: 1. Crusher; 2. Classifier; 3. Collector; 4. induced draft fan; 5. Feeder; 6. Bucket elevator; 7. Feed buffer bin; 8. Steam heat exchanger; 9. Finished product buffer bin; 201. Feed inlet; 202. Throwing port; 203. Distributing port. DETAILED DESCRIPTION
[0030] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments. The contents mentioned in the implementation modes are not intended to limit the present invention.
[0031] As used herein, "and / or" includes any and all combinations of one or more associated listed items. The terms used herein are only used to describe specific embodiments and are not intended to limit the present invention. As used herein, the singular forms "a", "an", "an" and "the" are also intended to include plural forms, unless the context clearly indicates otherwise. It is further understood that "including", when used in this specification, specifies the stated features, integers, steps, operations, elements and / or compositions, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, compositions and / or combinations thereof.
[0032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by ordinary technicians in the technical field to which the utility model belongs. It is further understood that terms, such as defined in commonly used dictionaries, are interpreted in accordance with their meanings in the context of the relevant field, and are not idealized or overly formal meanings, unless explicitly defined as such herein.
[0033] The exemplary utility model described herein may appropriately lack any one or more element limitations that are not specifically disclosed herein. Therefore, the terms "comprise", "include", "contain", etc. should be understood broadly and non-restrictively. In addition, the terminology used herein is used as a description, not a limitation, and it is unintentional to use these terminology expressions that do not include any equivalent characteristics, but only describe some of their characteristics, but various modifications are possible within the scope of the utility model according to the rights. Therefore, although the utility model has been specifically disclosed through preferred embodiments and optional features, the modifications disclosed herein to embody the changes of the utility model may be recorded by those skilled in the art, and such modifications and changes will be considered to be within the scope of the utility model.
[0034] like Figure 1 A drying system shown includes a pulverizer 1 having a drying function, a classifier 2 connected to the pulverizer 1, and a collector 3 to which the classifier 2 is connected;
[0035] like Figure 2 As shown, the classifier 2 includes a feed port 201, a throwing port 202, and a material distribution port 203;
[0036] The pulverizer 1 is connected to the feed port 201 of the classifier 2 ; the throwing port 202 of the classifier 2 is connected to the pulverizer 1 ; and the material distribution port 203 of the classifier 2 is connected to the collector 3 .
[0037] Specifically, in the present application, the crusher is a powerful crushing dryer; the powerful crushing dryer integrates crushing, drying and grading, has minimal heat consumption and heat loss, a thermal efficiency of more than 70%, a large drying capacity, a high output and uniform drying; it is easy to adjust the product fineness and the moisture content of the dry powder; the feeding device is unique, and the feeding is smooth and reliable; the drying speed is fast; the system negative pressure operation is dust-free, the operation is simple, the maintenance is convenient and the cost is low; a hydraulic station is provided for the high-speed and high-temperature crushing bearing to supply oil for lubrication and cooling, and has an automatic oil cut-off protection function, the whole machine has good strength and a long service life; the structure is compact and occupies a small area.
[0038] More specifically, you can choose the model: QGS-5 strong crushing dryer, drying temperature: 85℃, the moisture content of wet gypsum before drying: ≤25%, the moisture content of gypsum powder after drying: ≤0.2%;
[0039] In one embodiment, the pulverizer 1 is provided with an induced draft fan 4 .
[0040] In one embodiment, an induced draft fan 4 is provided on the material distribution port 203 of the classifier 2 .
[0041] Specifically, the classifier is a cyclone separator, for example, a cyclone separator of model: CLP / B-9.6 is selected.
[0042] In one embodiment, the collector 3 is connected to a feeder 5 , which is connected to a bucket elevator 6 .
[0043] In one embodiment, the drying temperature of the pulverizer 1 with a drying function is 85°C.
[0044] In one embodiment, the collector 3 is a bag filter.
[0045] In one embodiment, a feed buffer bin 7 is provided in the pulverizer 1 ; the feed buffer bin 7 is connected to a steam heat exchanger 8 .
[0046] Specifically, the steam heat exchanger uses a fin tube heat exchanger, model: FZL-15×12; the hot air temperature output by the fin tube heat exchanger is: 185°C.
[0047] In one embodiment, the bucket elevator 6 is connected to a finished product buffer bin 9; the finished product buffer bin 9 is used to store finished gypsum.
[0048] In one embodiment, the finished gypsum has a d50 of ≤25 μm and a moisture content of ≤0.2%.
[0049] In the above technical solution, the functions of each device are as follows:
[0050] Crusher (powerful crushing and drying machine): It mainly plays the role of crushing and drying. It crushes the wet materials with high force to dehydrate them quickly.
[0051] Classifier (cyclone separator): mainly plays the role of classifying materials. Through the classification effect of the cyclone separator, large pieces and undried materials will be returned to the crushing section for further drying and crushing, while qualified products will be collected.
[0052] Induced draft fan: It mainly plays a suction role. It can suck the exhaust gas and process it through the bag filter before discharging it into the atmosphere. At the same time, the induced draft fan also provides downward airflow, so that the materials can be better separated in the classifier.
[0053] Collector (bag dust collector): mainly plays the role of collecting materials. Bag dust collector can effectively collect and filter out materials in the gas to ensure the environmental protection of the system.
[0054] Steam heat exchanger (fin tube heat exchanger): mainly plays the role of heating air. Wet materials are highly crushed in hot air, so heated air is needed to provide the required heat energy. The steam heat exchanger exchanges heat between air and steam, raising the air temperature and providing the hot air required for drying the materials.
[0055] like Figure 3 The specific operation process of the drying system shown is as follows:
[0056] The filter cake (water content is about 25%) after secondary filtration by the plate and frame filter press enters the feed buffer bin of the QGS-5 high-power crushing dryer. The 4.0MPa (G) medium-pressure steam from outside the boundary exchanges heat with the air in the steam heat exchanger to heat the air. The wet gypsum material is highly crushed in the hot air (the linear speed of the crushing is 80m / s). The collision, friction and shearing effect between the materials make the gypsum quickly refined and dehydrated.
[0057] The gypsum material running upward is classified by the cyclone separator. The large pieces and undried gypsum are returned to the crushing section of the pulverizer through the bottom of the cyclone dust collector for further drying and crushing. The qualified products are collected by the bag dust collector. The tail gas enters the bag dust collector under the suction of the induced draft fan, and the materials entrained in the gas are separated. The gas phase is discharged into the atmosphere after being processed by the bag dust collector. The speed of the classifier adopts frequency conversion speed regulation, and the speed of the classifier can be adjusted according to the fineness and moisture content requirements of the product.
[0058] The dried gypsum products are connected to the belt conveyor from the bag dust collector outlet. The qualified gypsum materials are transported by the belt conveyor and sent to the finished product buffer warehouse through the gypsum bucket elevator. The finished products are packaged and stacked by automatic packaging machines and sent to the gypsum finished product warehouse by forklifts.
[0059] Therefore, in the above-mentioned drying system, fresh air is heated by the fin heat exchanger and enters the pulverizer. Under the upward suction of the induced draft fan, the wet material is conveyed into the pulverizer by the feed screw. During the crushing process of the hammer head of the pulverizer, the wet material is dried and crushed, and the dried and crushed material is separated by the classifier. The material with large fineness is thrown into the pulverizer for further crushing, and the material with small fineness is separated by the classifier and enters the bag dust collector. The fine material attached to the bag in the bag dust collector is back-blown down by the back-blowing air, and is conveyed to the long screw conveyor through the star feeder, and then conveyed to the bucket elevator by the long screw, and then to the finished product buffer bin through the bucket elevator. The drying system has achieved the following beneficial effects and advantages:
[0060] High efficiency: The system integrates crushing, drying and grading, has efficient drying capacity, and ensures uniform particle size distribution of the product. It has fast drying speed, high output and thermal efficiency of more than 70%.
[0061] Energy saving and environmental protection: The system optimizes the use of heat energy and reduces energy consumption. At the same time, the bag filter effectively collects and filters the materials in the gas, and the tail gas is purified and discharged into the atmosphere, ensuring the environmental protection of the system.
[0062] High-quality products: The system ensures the drying effect and product quality of gypsum by controlling the drying temperature and time. The d50 of the finished gypsum is ≤25μm and the moisture content is ≤0.2%, meeting the requirements of high-quality products.
[0063] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.
Claims
1. A drying system, characterized in that: It comprises a pulverizer (1) having a drying function, a classifier (2) connected to the pulverizer (1), and a collector (3) to which the classifier (2) is connected; The classifier (2) comprises a feed port (201), a throwing port (202), and a material separation port (203); The pulverizer (1) is connected to the feed port (201) of the classifier (2); the throwing port (202) of the classifier (2) is connected to the pulverizer (1); and the material distribution port (203) of the classifier (2) is connected to the collector (3).
2. A drying system according to claim 1, characterized in that: The pulverizer (1) is provided with an induced draft fan (4).
3. A drying system according to claim 1, characterized in that: An induced draft fan (4) is provided on the material distribution port (203) of the classifier (2).
4. A drying system according to claim 1, characterized in that: The collector (3) is connected to a feeder (5), and the feeder (5) is connected to a bucket elevator (6).
5. A drying system according to claim 1, characterized in that: The drying temperature of the pulverizer (1) with a drying function is 85°C.
6. A drying system according to claim 1, characterized in that: The collector (3) is a bag dust collector.
7. A drying system according to claim 1, characterized in that: A feed buffer bin (7) is arranged inside the pulverizer (1); the feed buffer bin (7) is connected to a steam heat exchanger (8).
8. A drying system according to claim 7, characterized in that: The output temperature of the steam heat exchanger (8) is 185°C.
9. A drying system according to claim 4, characterized in that: The bucket elevator (6) is connected to a finished product buffer bin (9); the finished product buffer bin (9) is used to store finished gypsum.
10. A drying system according to claim 9, characterized in that: The finished gypsum has a d50 of ≤25 μm and a moisture content of ≤0.2%.