Improved vacuum spray drying device

Abstract

An improved vacuum spray drying device comprises a raw material tank, a raw material pressurizer, a heater, a separator and a spiral dryer which are sequentially connected, a gas compressor is additionally arranged between the raw material pressurizer and the heater, and a compressed gas output pipeline of the gas compressor is communicated with a material input pipeline of the heater. According to the utility model, the gasification amount of liquid entering the separator is increased, so that the atomization effect of materials is good, and the drying uniformity of products is ensured.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically an improved vacuum spray drying device. Background Technology

[0002] In the existing vacuum spray drying equipment, the raw material is heated in the raw material tank and then output, pressurized by the raw material pressurizer, heated by the heater, and then sent to the nozzle in the separator for atomization. The gas separated by the separator is sent to the dust separator and condenser for treatment through the gas phase pipe. The material output from the bottom of the separator is sent to the spiral dryer for drying. However, when the material enters the nozzle in the separator for atomization, the amount of liquid vaporization is insufficient, making it difficult for the material to be dried to be dispersed in a mist in the separator. As a result, the uniformity of product drying is not very good. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an improved vacuum spray drying device that solves the problems existing in the prior art, increases the amount of liquid vaporization entering the separator, improves the atomization effect of the material, and ensures the uniformity of product drying.

[0004] The technical solution adopted in this utility model is:

[0005] An improved vacuum spray drying device includes a raw material tank, a raw material pressurizer, a heater, a separator, and a spiral dryer connected in sequence. A gas compressor is added between the raw material pressurizer and the heater, and the compressed gas output pipe of the gas compressor is connected to the material input pipe of the heater.

[0006] In the above technical solution, the separator is a vacuum separator, and the material output pipe of the heater is connected to the nozzle inside the separator.

[0007] In the above technical solution, the output end of the spiral dryer is connected to a pulverizer.

[0008] In the above technical solution, the gas phase pipe of the separator is connected to the dust separator, and the solvent gas pipe of the dust separator is connected to the condenser.

[0009] In the above technical solution, the gas compressor is an air compressor or an inert gas compressor.

[0010] This invention adds a gas compressor, whose compressed gas is connected to the material pipeline from the raw material pressurizer to the heater. By introducing a certain proportion of compressed gas through the compressor, the material to be dried is carried into the separator along with the compressed gas when it is sprayed out of the nozzle. In this way, the material is easily dispersed in the separator due to the action of the compressed gas, resulting in good atomization effect. The solvent flashes rapidly under vacuum, and the contained solid material is also well dispersed due to the action of the gas, resulting in good uniformity of product drying. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Attached image captions:

[0013] 1-Slurry raw material, 2-Raw material tank, 3-Raw material tank heat medium inlet, 4-Raw material tank heat medium outlet, 5-Raw material tank outlet pipe, 6-Raw material pressurizer, 7-Heater, 8-Heater heat medium inlet, 9-Heater heat medium outlet, 10-Gas-solid mixture, 11-Separator, 12-Spiral dryer, 13-Heat medium inlet, 14-Heat medium outlet, 15-Pulverizer, 16-Dust separator, 17-Dust collector, 18-Solvent gas, 19-Condenser, 20-Solvent recovery tank, 21-Vacuum exhaust gas, 22-Coolant outlet, 23-Coolant inlet, 24-Nozzle, 25-Pressurized material pipeline, 26-Gas phase pipe, 27-Gas compressor, 28-Permeate pipe. Detailed Implementation

[0014] See Figure 1 The improved vacuum spray drying device of this utility model includes a raw material tank 2, a raw material pressurizer 6, a heater 7, a separator 11, and a spiral dryer 12 connected in sequence. A gas compressor 27 is added between the raw material pressurizer 6 and the heater 7. The compressed gas output pipe of the gas compressor 27 is connected to the material input pipe of the heater. The separator is a vacuum separator. The material output pipe of the heater 7 is connected to the nozzle inside the separator. The output end of the spiral dryer 12 is connected to a pulverizer. The gas phase pipe of the separator 11 is connected to a dust separator. The solvent gas pipe of the dust separator is connected to a condenser. The gas compressor is an air compressor or an inert gas compressor.

[0015] Depending on the properties of the solvent to be dried, the compressed gas can be air, carbon dioxide, nitrogen, etc. Generally, air is used as the dispersing compressed gas in non-explosion-proof environments. In explosion-proof environments, inert gases such as nitrogen and carbon dioxide are used.

[0016] Pressurization: If a centrifugal pump or screw pump is used, the pump outlet pressure is generally between 0.2 and 0.4 MPa.

[0017] Heating: Saturated steam is generally used for heating. Depending on the wet solvent (which includes water, methanol, ethanol, benzene, toluene, and other solvents), saturated steam at 0.2-0.6 MPa is typically used. Hot water, heat transfer oil, or electricity can also be used for heating. The temperature of the material inside the pipes after heating in the heating chamber is generally between 80-150℃.

[0018] Flash evaporation: When a liquid subjected to high temperature and pressure enters a vacuum environment, it rapidly vaporizes; this is called flash evaporation. The purpose of drying is to vaporize the liquid and carry it away from the system. The temperature of the material in the separation chamber varies depending on the degree of vacuum control, and the temperature of the material after flash evaporation is generally between 40-80℃.

[0019] The cooling fluid used for condensation is generally circulating water (around 30℃), cold water (7℃), or chilled brine (generally -5 to -20℃). Depending on the properties of the material, if the solvent is water, the first two are used; if the solvent is an organic solvent, all three can be used, but cold water or chilled brine is more preferred.

Claims

1. An improved vacuum spray drying apparatus, comprising a raw material tank, a raw material pressurizer, a heater, a separator, and a spiral dryer connected in sequence, characterized in that: A gas compressor is added between the raw material pressurizer and the heater, and the compressed gas output pipe of the gas compressor is connected to the material input pipe of the heater.

2. The improved vacuum spray drying apparatus according to claim 1, characterized in that: The separator is a vacuum separator, and the material output pipe of the heater is connected to the nozzle inside the separator.

3. The improved vacuum spray drying apparatus according to claim 1, characterized in that: The output end of the spiral dryer is connected to a pulverizer.

4. The improved vacuum spray drying apparatus according to claim 1, characterized in that: The gas phase pipe of the separator is connected to the dust separator, and the solvent gas pipe of the dust separator is connected to the condenser.

5. The improved vacuum spray drying apparatus according to claim 1, characterized in that: The gas compressor is an air compressor or an inert gas compressor.

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