Pressure type spray cooling dryer

The pressure type spray cooling dryer is a device that can complete drying and granulation at the same time. According to the process requirements, the pressure, flow rate, and nozzle size of the material liquid pump can be adjusted to obtain the required spherical particles in a certain size ratio. Spray dryer is a kind of continuous atmospheric pressure dryer. Spray the liquid material into a mist using special equipment, and dry it by contacting it with hot air. Used for drying some heat sensitive liquids, suspensions, and viscous liquids, as well as for drying fuels, intermediates, soap powders, and inorganic salts. Generally, it includes electric blast drying oven, vacuum drying oven, high-speed centrifugal spray dryer and sterile spray dryer. The working principle, basic classification, characteristics, technical parameters, application range and operation process of spray dryer are introduced in detail.

Working principle of pressure type spray cooling dryer

The working process of this unit involves the high-pressure input of material liquid through a diaphragm pump, spraying mist like droplets, and then flowing down in parallel with hot air. Most of the powder particles are collected by the bottom discharge port of the tower, and the exhaust gas and its small powder are separated by a cyclone separator. The exhaust gas is discharged by a suction fan, and the powder is collected by a pollination tube located at the lower end of the cyclone separator. The fan outlet can also be equipped with a secondary dust removal device, with a recovery rate of over 96-98%.

Features of pressure type spray cooling dryer

The drying speed is fast, and the surface area of the material liquid is greatly increased after atomization. In the hot air flow, 95% -98% of the water can be evaporated in an instant, and the drying time only needs tens of seconds to tens of seconds. It is particularly suitable for drying heat sensitive materials.

All products are spherical particles with uniform particle size, good flowability, good solubility, high product purity, and good quality.

Widely applicable, according to the characteristics of the material, it can be dried with hot air or granulated with cold air, with strong adaptability to the material.

Simple and stable operation, convenient control, and easy implementation of automated tasks.

Design requirements of pressure type spray cooling dryer

Name: Fruit and Vegetable Powder

Initial moisture content: around 75% (depending on the specific product)

Final moisture content: ≤ 5%

Water evaporation rate:~350Kg/h

Liquid temperature: around 20 ℃ at room temperature

Process conditions of pressure spray dryer for fruit and vegetable powder

Atomization method: pressure type

Contact mode between fog droplets and hot air: parallel flow

Heat source and heating method: gas hot blast stove

Inlet air temperature: around 200 ℃ (maximum 220 ℃)

Exhaust temperature: around 90 ℃

Dust removal method: tower bottom+cyclone+water film dust removal

System material requirements: see configuration list

Design meteorological conditions of pressure type spray cooling dryer

Atmospheric pressure: 101.3KPa

Environmental temperature: 15 ℃

Relative humidity: 80%

utilities

1. Power supply

Power supply: 380V, 3-phase 5-wire, 50HZ

Power: 91kw

2. Compressed air

Pressure: 0.6 MPa

Dosage: 3.5m3/min

3. Water usage

Pure water consumption: about 1500kg/time (used for heating and cooling)

4. The equipment occupies an area of approximately (length x width x height) m

Length x Width x Height: 15 x 11 x 25

System Description

Primary type: YPG-350 spray drying unit

Air filtration system: primary and medium efficiency air filters, high-temperature and high-efficiency filters

Heating system: steam heating+electric heating compensation or indirect combustion gas hot blast stove

Medium circulation system: open circulation of supply fan and induced draft fan

Discharge and dust removal system: tower bottom+cyclone dust removal+water film dust removal

Material collection system: Frozen dehumidification negative pressure conveying centralized material collection

Feeding system: high-pressure plunger pump pressure feeding

Control system: Digital display instruments display temperature, pressure, and pressure difference, touch screen animation displays workflow, and various parameters are centrally set

Automatic tracking and control of variable parameters using PLC fuzzy technology

Overview of pressure type spray cooling dryer

　　It is a kind of equipment that uses a pressure type nozzle to atomize solution, suspended lotion, floating liquid, paste like materials into small droplets with the help of the pressure of a high-pressure pump, and then quickly exchanges heat with high-temperature hot air to quickly and continuously dry into fine granular materials in a very short time with a simple process. This machine has the characteristics of high dust collection rate, non stick wall, energy saving and high efficiency, and is particularly suitable for drying heat sensitive materials. Widely used in industries such as food, dyes, intermediates, etc. It is a device that can simultaneously complete drying and granulation. According to the process requirements, the pressure, flow rate, and nozzle size of the material liquid pump can be adjusted to obtain the required spherical particles in a certain size ratio.