1.1 Single effect concentrators are widely used for evaporation and concentration of water or organic solvent solutions in industries such as medicine, food, chemical, and light industry. Under vacuum conditions, low-temperature continuous concentration ensures product quality, and with the addition of a condensing device, the solvent can be effectively recovered.

1.2 Industrial alcohol recovery from traditional Chinese medicine, western medicine, glucose, brewing, starch, oral liquid, chemical industry, food, natural flavor products, food additives, monosodium glutamate, dairy products, etc., can be used for vacuum concentration with low heat sensitivity for small batches and multiple varieties.

1.3 Alcohol recovery: With high recovery capacity, it adopts a vacuum concentration process. Compared to similar equipment of the old model, it has improved by 5-10 times, reduced energy consumption by 30%, and has the characteristics of low investment and high recovery efficiency.

1.4 Concentrated liquid material: the single effect concentrator adopts the external heating natural circulation and vacuum negative pressure evaporation mode, with fast evaporation speed. The liquid material has no foam concentration in the fully sealed state. The concentrated liquid from the single effect concentrator has the characteristics of no pollution, strong medicine flavor, and easy cleaning (open the upper and lower covers of the heater to clean). The single effect concentrator is easy to operate and occupies a small area. The heater and evaporator adopt stainless steel insulation structure, and the insulation is made of polyurethane foam. The outer surface is frosted and matte treated, and the concentrator meets GMP pharmaceutical standards.

2、 Structure and performance of single effect concentrator

2.1 The single effect concentrator consists of a heating chamber, an evaporation chamber, a condenser, a cooler, a water receiver, and connecting fittings. The entire equipment is made of SUS304 material. Single effect concentrator belongs to external heating (external circulation) evaporator (concentrator), and when equipped with vacuum, its full name should be external heating vacuum pressure reducing evaporator (concentrator). The characteristic is to assemble the heating chamber outside the separation chamber, which not only facilitates cleaning and replacement but also reduces the overall temperature of the evaporator. Due to the long heating tube, the circulation tube is not heated, and the solution circulation speed is fast, which improves the heat transfer coefficient. However, the concentration should not be too high to affect the flow, and attention should be paid to scaling and coking.

2.2 Heating chamber: The interior of the heating chamber is tubular, with double-layer insulation. The upper and lower parts are connected to the evaporation chamber through nozzle elbows. The upper hole cover is used for cleaning the piping. The first effect heating chamber is equipped with a steam pressure gauge and a safety valve to ensure production safety.

2.3 Evaporation Chamber: The evaporation chamber is a double-layer structure with insulation and heat preservation. It is equipped with a mirror on the front for the operator to observe the evaporation of the liquid material, and is also equipped with a vacuum gauge and a temperature gauge for easy observation and control of the indoor vacuum degree and liquid temperature.

2.4 Condenser: The condenser is a tubular type

2.5 Cooler: The cooler is a coil type

2.6 Water Receiver: The water receiver is located at the lower part of the cooler, and the condensed water flows into the lower layer through a pipe and is discharged through a drainage pump.

3、 Working principle of single effect concentrator

A steam (saturated water vapor) enters the heating chamber to heat the material liquid, and at the same time, under the action of vacuum, it is sprayed into the evaporation chamber from the nozzle. The material liquid returns to the heating chamber from the bend and is heated again before being sprayed into the evaporation chamber to form a cycle. When the material liquid is sprayed into the evaporation chamber, it forms a mist, and the water is quickly evaporated. The steam evaporated from the evaporation chamber enters the condenser and is cooled by tap water to form condensed water, which flows into the water receiver and is discharged by the drainage pump. After multiple cycles, the water in the feed liquid is continuously evaporated, and the concentration is increased until it is concentrated to the desired specific gravity and discharged from the liquid (paste) outlet. The cooling water undergoes heat exchange through the cooler, and when the water temperature rises to 30-40 ℃, it is sent to the plant's main water pipe for use throughout the plant or sent to the cooling tower for recycling.

4、 Technical parameters of single effect concentrator:

Model DN-500 DN-1000 DN1500 DN-2000

Evaporation rate (kg/h) 500 2000

Steam pressure (Mpa) ＜ 0.25

Vacuum degree (Mpa) 0.08

Concentrated specific gravity 1.2-1.3

Dimensions (mm) 2 × 1 × 3 2.2 × 1.2 × 3.3 2.5 × 1.3 × 3.5 4.6 × 2.35 × 5.1

5、 Single effect concentrator, external circulation single effect concentrator, single effect alcohol concentrator:

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