Double-effect evaporator introduction

Double-effect evaporator is an energy-saving evaporation equipment, which improves the utilization rate of heat energy by connecting two or more evaporators in series. Double-effect evaporator is an efficient and energy-saving evaporation equipment, suitable for a variety of industrial fields, especially in occasions where a large amount of evaporation and crystallization operations are required.

Composition of double-effect evaporator

The composition of double-effect evaporator mainly includes: one-two effect heater, one-two effect separator, condenser, hot pressure pump (optional), vacuum and drainage system, circulation or delivery pump, operation platform, electric control cabinet, valve pipeline and other systems.
1. One-two effect heater: As the core part of the double-effect evaporator, it is responsible for the heating and evaporation process of the material. The first effect heater uses an external heat source (such as raw steam) to heat the material, and the secondary steam generated is introduced into the second effect heater as its heating source.
2. One-two effect separator: located after each effect heater, it is used to separate the evaporated gas from the liquid to ensure that the steam is not entrained by the liquid and improve the evaporation efficiency.
3. Condenser: used to condense the separated secondary steam into liquid for recovery or discharge.
4. Hot pressure pump: an optional accessory used to increase the pressure in the system to meet the evaporation requirements of different materials.
5. Vacuum and drainage system: establish and maintain the vacuum state in the system, and remove condensate and concentrate in the system.
6. Circulation or delivery pump: used to transport materials to the heater and circulate in the system.
7. Operation platform: provides a working area for operators to control and monitor the operation of the equipment.
8. Electric control cabinet: contains electrical appliances and instruments, used to control the automatic operation of the entire evaporator system.
9. Valve pipeline: connects various components to ensure that materials and steam can flow smoothly in the system.

Advantages of double-effect evaporator

The characteristics of double-effect evaporator are as follows:
1. Energy saving and consumption reduction: By utilizing the heat of secondary steam, the double-effect evaporator system significantly reduces energy consumption. During the double-effect evaporation process, the second-effect heater uses the secondary steam generated by the first effect for heating, which not only saves energy but also reduces the demand for cooling water.
2. High degree of automation: The double-effect evaporator system can be equipped with a CIP cleaning system to achieve on-site cleaning and easy operation. At the same time, the equipment can continuously feed and discharge materials, and can be equipped with an automation system to achieve automatic control of feed volume, heating temperature, discharge concentration and cleaning.
3. Complete equipment protection measures: The double-effect evaporator system can also be equipped with protection measures for materials in the event of sudden power outages and failures, as well as automatic operations and controls such as alarms to ensure low-consumption operation of the entire evaporator system.
4. Strong adaptability: The double-effect evaporator system is suitable for the solution evaporation and concentration needs of different industries, and can handle various types of materials, such as chemical, food, pharmaceutical and other industries in industrial production, and is also commonly used for industrial wastewater treatment.
5. Pollution-free discharge: In the double-effect evaporator system, secondary steam is fully utilized, avoiding environmental pollution caused by direct discharge in traditional single-effect evaporators.
6. Space saving: Compared with multiple single-effect evaporators in series, the double-effect evaporator system has high integration, small footprint, and saves installation space.
7. Low operating cost: Due to the significant energy-saving effect, the operating cost of the double-effect evaporator system is reduced, saving a lot of energy costs for the enterprise.
8. Crystallization function: For materials that need to be crystallized, the double-effect evaporator system can achieve efficient crystallization and improve product quality.

Scope of application of double-effect evaporator

Chemical industry: In the chemical industry, double-effect evaporators are used in the production and preparation of chemicals such as ammonium nitrate, caustic soda, antibiotics, and the treatment of industrial wastewater.
Light industry: In the light industry, double-effect evaporators can be used for evaporation and concentration in the sugar making process to improve production efficiency.
Food industry: In the food industry, double-effect evaporators are used for the concentration of food liquids, such as juice, milk, etc.
Pharmaceutical industry: In the pharmaceutical industry, double-effect evaporators are used for the concentration and purification of pharmaceutical solutions to ensure the quality and safety of drugs.
Environmental protection industry: Double-effect evaporators are also widely used in the field of environmental protection, especially in the treatment of industrial wastewater, such as chemical, pharmaceutical, metallurgical, mining, petrochemical, rare earth, lithium battery, hazardous waste and other industries. In the wastewater treatment process, double-effect evaporators can effectively reduce energy consumption and achieve economical water treatment solutions.

Double-effect evaporator technology principle:

First effect evaporation: the raw material liquid first enters the first effect heater, where it is heated to a boiling state by an external heat source (such as raw steam), causing some of the water to vaporize. This process is called primary evaporation.

The use of secondary steam: the secondary steam generated in the first effect heater is not directly discharged, but is used as the heat source of the second effect heater. In this way, the raw material liquid in the secondary heater can be vaporized again using the latent heat of these secondary vapors, thus saving the need for external heat sources.

Second effect evaporation: the raw material liquid after the first effect preheating enters the second effect heater, where it is heated by the secondary steam generated by the first effect for secondary evaporation. This process further increases the concentration of the solution.

Energy saving: Since the secondary evaporation uses the secondary steam that would otherwise be expelled, the energy efficiency of the entire system is significantly improved. Compared to single-effect evaporation, dual-effect evaporation can save about 50% of energy consumption.

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