Energy-saving drying device for wet grinding of calcium carbonate powder
By using a drying device that combines ultrasonic dispersion and centrifugal atomization, the problems of high energy consumption and agglomeration in the drying process of wet-milled calcium carbonate powder are solved, achieving energy-saving and efficient drying effect, reducing energy consumption and powder agglomeration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-24
AI Technical Summary
Existing wet grinding technology for drying calcium carbonate powder is energy-intensive, has low thermal efficiency, and the powder is prone to agglomeration during the drying process, requiring secondary crushing.
The system employs a two-stage combination of ultrasonic dispersion and centrifugal atomization design, combined with a waste heat recovery system. After ultrasonic pre-dispersion of the slurry, it is centrifugally atomized into tiny droplets and dried using high-temperature hot air. The waste heat from the exhaust gas is used to preheat fresh air, forming a closed-loop thermal energy utilization system.
It achieves a 30%-40% reduction in overall energy consumption, reduces the agglomeration rate to below 5%, and features simple equipment operation, low failure rate, and high production efficiency.
Smart Images
Figure CN224024253U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of energy-saving drying device for wet grinding calcium carbonate powder, belong to material drying technical field. BACKGROUND
[0002] Wet grinding process is by powder and water preparation certain solid content slurry to grind, by using water to be the dispersion medium of grinding, can prepare high mesh super fine calcium carbonate powder, but the water content of slurry after grinding is as high as 30%-50%, need to obtain finished product by drying treatment.
[0003] Current commonly used drying technology has spray drying, flash drying etc., these drying methods have the following problems: one is high energy consumption, hot air temperature needs to maintain 200 DEG C or above, tail gas waste heat is not recycled, thermal efficiency is less than 50%;Second, product in drying process powder is unevenly heated, easy to cake, easy to agglomerate, need secondary crushing.
[0004] Therefore, an energy-saving, efficient, anti-agglomeration drying device is needed. SUMMARY
[0005] The utility model aims at, to solve the above-mentioned problems of powder slurry using traditional drying technology, propose a kind of energy-saving drying device for wet grinding calcium carbonate powder.
[0006] The technical scheme of the utility model is as follows, a kind of energy-saving drying device for wet grinding calcium carbonate powder, including slurry barrel, feeding pump, dryer, induced draft fan, cloth bag dust collector, centrifugal atomizer, ultrasonic disperser, heater, heat exchanger and air filter.
[0007] The dryer is a vertical cylindrical tank body, the lower part of the tank body is conical, the top of the dryer is provided with a hot air inlet, and a centrifugal atomizer and an ultrasonic disperser are installed at the hot air inlet of the dryer;The centrifugal atomizer is connected to the feeding pump by a pipeline, the feeding pump is connected to the slurry barrel by a pipeline, and the ultrasonic disperser is installed on the pipeline at the front end of the centrifugal atomizer;The heater is connected to the heat exchanger, the hot air of the heat exchanger is sent to the heater for heating, and then sent to the hot air inlet of the dryer through the air filter;One end of the heat exchanger is connected to the induced draft fan to receive the air waste heat of the induced draft fan;The air inlet end of the induced draft fan is connected to the cloth bag dust collector;The lower part of the dryer is connected to the upper part of the cloth bag dust collector by a pipeline.
[0008] The ultrasonic disperser and the centrifugal atomizer constitute a two-stage combination, and the slurry is first dispersed by ultrasonic waves and then centrifugally atomized by the centrifugal atomizer.
[0009] The bottom of the dryer is provided with a discharge port, and the discharge port is provided with a valve.
[0010] The utility model discloses a beneficial effect is, the utility model discloses a device through the waste heat recovery, system reduces the heat energy loss, and the comprehensive energy consumption reduces 30%-40%;The utility model discloses a device adopts the ultrasonic wave pre-dispersion and then centrifugal atomization design, and the agglomeration rate is less than 5%;The utility model discloses a device equipment simple operation, and the failure rate is low, and it is convenient to maintain, and the automation degree is high, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structural diagram of the utility model device;
[0012] In the drawing, 1 is slurry bucket;2 is feeding pump;3 is centrifugal atomizer;4 is ultrasonic wave disperser;5 is hot air import;6 is heater;7 is air filter;8 is dryer;9 is heat exchanger;10 is induced draft fan;11 is cloth bag dust collector. DETAILED DESCRIPTION
[0013] As Figure 1 Shown, the utility model discloses a kind of energy-saving drying device for wet grinding calcium carbonate powder, including slurry bucket 1, feeding pump 2, centrifugal atomizer 3, ultrasonic wave disperser 4, hot air import 5, heater 6, air filter 7, dryer 8, heat exchanger 9, induced draft fan 10 and cloth bag dust collector 11.
[0014] The slurry bucket 1 of this embodiment is stainless steel material, with a diameter of 1.2 m and a height of 1.8 m;The feeding pump 2 has a power of 2.5 KW and is connected to the slurry bucket 1 and the dryer 8 through a conveying pipeline.
[0015] The centrifugal atomizer 3 of this embodiment is installed at the top of the dryer 8 and is a mechatronic atomizer.
[0016] The ultrasonic wave disperser 4 of this embodiment is installed at the front end of the centrifugal atomizer 3 and is combined with the centrifugal atomizer 3 in two stages, so that the slurry is first dispersed by ultrasonic waves and then centrifugally atomized.
[0017] The hot air import 5 of this embodiment has a pipe diameter of 20 cm;The heater 6 has a power of 12 KW and is connected to the air filter 7.
[0018] The dryer 8 of this embodiment is a stainless steel conical barrel with a height of 2.2 m and a top diameter of 1.6 m;The heat exchanger 9 is made of copper and is used for heat exchange between two air flows;The induced draft fan 10 is connected to the heat exchanger 9 and the cloth bag dust collector 11 through a pipeline and has a power of 4.5 KW.
[0019] The process flow of the embodiment is as follows: the slurry after wet grinding is stored in a slurry barrel 1, is delivered to a dryer 8 through a pipeline by a feeding pump 2, is pre-treated to disperse the agglomerated particles by an ultrasonic disperser 4, and then is formed into 20-50 μm droplets by a centrifugal atomizer 3, so that the powder agglomeration is reduced; the centrifugal atomizer 3 is arranged at the top of the dryer 8 and is connected with a high-temperature hot air inlet; high-temperature hot air (180-220 ℃) generated by a heater 6 is contacted with the atomized droplets in the dryer 8, so that the moisture is rapidly evaporated; the dried powder is collected by a bag-type dust collector 11; the tail gas (temperature about 80 ℃) after dust removal is used to preheat fresh air by a heat exchanger 9, and then is recycled into the heater 6 to be heated to form hot air; and the system heat efficiency after waste heat treatment can be increased to more than 70%.
Claims
1. An energy-saving drying device for wet-ground calcium carbonate powder, comprising a slurry barrel, a feeding pump, a dryer, an air induction fan and a bag-type dust collector, characterized in that, The device further comprises a centrifugal atomizer, an ultrasonic disperser, a heater, a heat exchanger and an air filter, the dryer is a vertical cylindrical tank, the lower part of the tank is conical, a hot air inlet is arranged at the top of the dryer, the centrifugal atomizer and the ultrasonic disperser are installed at the hot air inlet of the dryer; the centrifugal atomizer is connected with a feeding pump through a pipeline, the feeding pump is connected with a slurry barrel through a pipeline, and the ultrasonic disperser is installed on the pipeline at the front end of the centrifugal atomizer; the heater is connected with the heat exchanger, the heat exchanger sends hot air to the heater for heating, and then the hot air is sent to the hot air inlet of the dryer through the air filter; one end of the heat exchanger is connected with an induced draft fan to receive the air waste heat of the induced draft fan; the air inlet end of the induced draft fan is connected with a bag-type dust collector; and the lower part of the dryer is connected with the upper part of the bag-type dust collector through a pipeline.
2. The energy-saving drying device for wet ground calcium carbonate powder according to claim 1, characterized in that, The ultrasonic disperser and the centrifugal atomizer constitute a two-stage combination, the slurry is first dispersed by the ultrasonic disperser and then centrifugally atomized by the centrifugal atomizer.
3. The energy-saving drying device for wet ground calcium carbonate powder according to claim 1, characterized in that, The bottom of the dryer is provided with a discharge port, and the discharge port is provided with a valve.