Product Introduction

　　 MVR Evaporation Equipment (Mechanical Vapor Recompression, Mechanical Vapor Recompression) It is an ultra-energy-efficient evaporation device based on the principle of “secondary steam compression and temperature rise plus self-circulating heating.” At its core, it adopts an integrated structure comprising an evaporator and a steam compressor. The compressor compresses and raises the temperature of the secondary steam generated by the evaporator, then recycles this heated steam as its own heat source for continuous operation. The system requires only a small amount of electrical energy to drive the compressor, with virtually no or minimal consumption of fresh steam. With its key advantages—ultra-high energy efficiency (80%–90% more energy-efficient than single-effect evaporation), low operating costs, environmental friendliness and emission reduction, and compact footprint—the equipment is widely used in solution concentration, salt recovery, and zero-discharge wastewater treatment processes across industries such as chemical engineering, salt chemical industry, environmental protection, food processing, and pharmaceuticals. It is particularly well-suited for high-energy-consumption, large-scale feedstock processing applications. Depending on the characteristics of the feedstock (such as viscosity, corrosiveness, and thermal sensitivity) and production capacity requirements (ranging from 0.5 t/h to 300 t/h), the equipment can be customized with different types of evaporators (falling film, forced circulation, plate-type), compressor models, and process parameters, making it suitable for both continuous and batch production.

Product Category

　　Depending on the compressor type, evaporator configuration, and application scenario, MVR evaporation equipment is primarily categorized as follows:

　 　1. Classified by compressor type

　　 ▪ Roots-type MVR evaporation equipment: Utilizing Roots compressors with a moderate compression ratio (1.2–2.0) and stable discharge volume, this equipment is well-suited for small- to medium-capacity applications (0.5 t/h to 50 t/h) and low-viscosity feed liquids (such as food concentrates and pharmaceutical intermediates). Additionally, the equipment boasts relatively low capital investment costs.

　　 ▪ Centrifugal MVR evaporation equipment: Utilizing a centrifugal compressor, this system features a high compression ratio (1.5–3.0), large processing capacity, and is well-suited for medium- to large-scale production capacities (50 t/h – 300 t/h) as well as high-concentration feed liquids (such as in salt chemical industries and large-scale zero-discharge wastewater systems). It also boasts high operational efficiency.

　　 ▪ Screw-type MVR evaporation equipment: Utilizing a screw compressor that combines the stability of Roots-type compressors with the high efficiency of centrifugal compressors, this unit features a compression ratio ranging from 1.3 to 2.5 and is ideally suited for medium-capacity applications (20 t/h to 100 t/h) involving medium-to-high viscosity feed liquids (such as concentrated fine chemical wastewater). It offers exceptional operational flexibility.

　　 ▪ Reciprocating MVR Evaporation Equipment: It employs a reciprocating compressor with a high compression ratio (2.0–4.0), making it suitable for high-pressure, low-flow applications (such as specialized solvent recovery). Its application scenarios are relatively niche.

　　 2. Classification by evaporator type Combination

　 　▪ MVR falling film evaporation equipment: The evaporator features a falling-film structure, offering a high heat transfer coefficient (2000–6000 W/(m²·℃)), with a short residence time for the material (from several seconds to tens of seconds). It is particularly suitable for heat-sensitive and low-viscosity feed liquids (such as fruit juices, traditional Chinese medicine extracts, and concentrated biological preparations).

　　 ▪ MVR forced-circulation evaporation equipment: The evaporator features a forced-circulation design with a high feed liquid velocity (2–5 m/s), offering excellent anti-scaling performance. It is particularly suitable for handling high-salt, high-viscosity, and easily crystallizing feed liquids (such as high-salt wastewater, salt chemical crystallization, and electroplating waste liquid treatment).

　　 ▪ MVR plate-type evaporation equipment: The evaporator features a plate-type structure, offering extremely high heat transfer efficiency and occupying a minimal footprint. It is ideally suited for medium- and small-scale applications (0.5 t/h to 30 t/h) and scenarios with space constraints—such as small chemical plants and laboratory wastewater treatment facilities.

　　 ▪ MVR hybrid evaporation equipment: A combination of a pre-stage falling-film evaporator and a post-stage forced-circulation system, which balances high-efficiency concentration with anti-scaling performance, is ideally suited for complex feed liquids with large concentration gradients and a tendency to scale (such as integrated wastewater from chemical industrial parks).

Performance Features

　　 1. Ultimate energy efficiency: The secondary steam recycling rate reaches over 95%, and the energy consumption is only 10%–20% of that of conventional single-effect evaporators and 30%–50% of that of multi-effect evaporators. The energy consumption per ton of water evaporated is as low as 20–80 kWh (compared to approximately 300–500 kWh for conventional single-effect evaporators), significantly reducing operating costs.

　 　2. Environmental protection and emission reduction: It requires no or very little fresh steam, significantly reducing CO₂ and sulfur dioxide emissions from coal- or gas-fired boilers. Operating in a closed-loop system eliminates solvent volatilization and pollution, with a condensate recovery rate of ≥95%. This system boasts high water resource recycling efficiency and fully complies with environmental protection policies.

　 　3. Stable and reliable operation: Equipped with a PLC-based automated control system, the device precisely regulates the compressor speed, evaporator temperature, pressure, and liquid level, thereby preventing issues such as dry wall, scaling, and liquid hammering. The equipment can operate continuously for 6 to 12 months, and its failure rate is significantly lower than that of conventional evaporation equipment.

　　 4. High processing efficiency: After the compressor upgrade, the temperature difference between the secondary steam and the feed liquid is stable (5–20℃), resulting in high heat transfer efficiency and an evaporation intensity reaching 50–150 kg/(m²·h)—an improvement of 30%–50% compared to conventional multi-effect evaporation.

　　5. Wide compatibility: It can handle various solutions with solute concentrations ranging from 5% to 40% and viscosities up to 1,000 mPa·s. It is compatible with materials spanning low to medium-to-high viscosity, containing suspended solids (up to 5%), corrosive substances (customized material selection available), and heat-sensitive materials. The operating temperature can be flexibly adjusted between 30°C and 120°C to suit different material properties.

　　 6. Compact structure with a small footprint: Without the bulky condensers and steam pipelines required by conventional multi-effect evaporators, this equipment occupies only one-third to one-half the floor space of equivalent-capacity multi-effect systems, making it ideal for new projects with limited site space or for upgrading existing plants.

　 　7. Flexible operation: The capacity adjustment range is wide (30%-120%), and dynamic load adaptation can be achieved by adjusting the compressor speed via frequency conversion. The system supports both continuous and batch production, and a single set of equipment can handle multiple types of materials, making it suitable for producing a variety of products.

　 　8. Short investment payback period: Although the initial investment is 20% to 50% higher than that of conventional multi-effect equipment, thanks to extremely low energy consumption and operating costs, the investment payback period typically ranges from 1 to 3 years; in scenarios with high energy consumption, this period can be shortened to just 6 to 12 months.

Application scenarios

　　Thanks to its core advantages of extreme energy efficiency and environmental friendliness, the MVR evaporation equipment is widely used in the following industries:

　 　1. Chemical industry: Concentration of salt solutions (sodium chloride, potassium chloride, sodium sulfate); concentration of chemical raw materials (ethylene glycol, propylene glycol, diethylene glycol); recovery of organic solvents (methanol, ethanol, acetone, ethyl acetate); concentration of fine chemical intermediates (dyes, coating intermediates).

　　 2. Salt chemical industry: Industrial salt production (concentration and crystallization of sea salt and lake salt), specialty salt purification (potassium nitrate, ammonium chloride, potassium dihydrogen phosphate), salt sludge recovery (salt crystallization from saline wastewater), and brine concentration.

　 　3. Environmental Protection Industry: Zero-discharge of high-salinity wastewater (including wastewater from chemical parks, electroplating wastewater, coal chemical wastewater, and dyeing and printing wastewater); concentration of leachate from municipal solid waste (followed by deep concentration using DTRO); concentration and volume reduction of organic wastewater (including printing wastewater and coating wastewater); and treatment of desulfurization wastewater.

　 　4. Food industry: Large-scale juice concentration (orange juice, apple juice, tomato juice), sucrose/maltose syrup concentration, dairy product concentration (milk, whey protein), food additive concentration (citric acid, lactic acid, xylitol);

　 　6. Other areas: Seawater desalination (from small-scale to medium-scale freshwater production), black liquor concentration in the paper industry (lignin recovery), electroplating solution recovery (concentration and reuse of spent chromium- and zinc-plating solutions), lithium battery material production (concentration of lithium salt solutions, treatment of spent cathode materials), and high-purity water preparation for the electronics industry.