Evaporator

Changzhou Jiangyou Heating&Cooling Technology Co., Ltd.: Your Professional Evaporator Manufacturer!

We are located at No. 14 Fengrun Road, Luoyang Town, Wujin District, Changzhou City, Jiangsu Province, and are a comprehensive enterprise integrating technology research and development, production, sales, and service. Our company adheres to the principles of seeking truth, being pragmatic, innovating, and actively absorbing advanced technologies from domestic and foreign peers to continuously improve product quality and meet different customer needs. Our products have covered all provinces, municipalities, autonomous regions, and centrally-administered cities in China. With reliable product quality and excellent pre-sales and after-sales services, we have won the favor and trust of our customers.

Advanced Technology Equipment

Our company has introduced advanced technologies and equipment from both domestic and international sources, committed to producing high-quality refrigeration and air conditioning equipment. Through continuous innovation and technological upgrades, we can provide our customers with efficient, environmentally friendly, and durable products.

Diverse Product Lines

Specializing in the production of various high-demand cold storage plates, including arc angle cold storage plates, we offer products featuring environmental protection, corrosion resistance, and high flame retardancy. Additionally, we manufacture a wide range of cold storage doors such as double-open, single-open, electric or manual translational doors, chain doors, automatic return doors, free anti-collision insulation doors, modified atmosphere doors, and clean doors to meet diverse customer needs.

Professional Technical Services

Our business scope includes technical services, development, consultation, exchange, transfer, and promotion. With a professional technical team, we provide one-stop services from product design to installation and commissioning, ensuring every project achieves optimal results.

Comprehensive After-Sales Service

Beyond manufacturing and selling high-quality refrigeration and air conditioning equipment, we also offer installation and maintenance services. We commit to providing full support and assistance at every stage before, during, and after the sale, ensuring our customers face no worries throughout their usage period.

Ceiling-mounted Evaporator
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What is an Evaporator

Evaporators are heat exchangers that transfer heat from the process fluid into the refrigerant causing a phase change, and evaporation. In an evaporator, the refrigerant enters as a low-pressure liquid/vapor mixture and exits as a low-pressure gas. The change of state from liquid to gas occurs at a constant temperature and absorbs energy. A chiller’s evaporator achieves superheated refrigerant vapor. Superheat is when all the liquid refrigerant has evaporated, and the gas temperature increases above its saturation temperature. The process fluid enters as a hot liquid and exits at a lower temperature after transferring energy to the refrigerant.

Features of Evaporators

Concentration Mechanism
Evaporators employ heat to concentrate solutions by selectively removing water, leaving behind a more potent substance. This mechanism is fundamental to their function in diverse industrial applications.

Versatility in Applications
A key feature of evaporator is their adaptability to a wide range of industries, including food processing, chemical manufacturing, and wastewater treatment. Their design allows for handling various liquids and solutions.

Water Recovery Capability
Evaporators contribute significantly to water conservation by efficiently recovering water from solutions. This is crucial for sustainable practices and reducing overall water consumption in industrial processes.

Energy-Efficient Design

Modern evaporators often incorporate energy-efficient features such as multiple-effect systems and thermal vapor recompression, minimizing energy consumption during operation.

Materials Compatibility

Evaporators are designed to handle different types of liquids, including corrosive or heat-sensitive solutions. This compatibility enhances their utility across diverse industrial settings.

Scalability

Evaporators are scalable to meet varying production needs. Whether in small-scale processes or large industrial operations, their design allows for customization to suit specific requirements.

Challenges and Considerations

Despite their advantages, evaporators face challenges such as scaling, initial capital investment, and heat sensitivity. Understanding these considerations is essential for optimizing their performance and addressing potential drawbacks. You can easily find the evaporator supplier.

Types of Evaporators

Falling Film Evaporator
Falling Film Evaporator inverts to optimize heat exchange, placing the exchanger at the top for efficient operation. The evaporator receives the feed at its top and subsequently distributes it further to the tubes. It consists of a vertical shell and a tube heat exchanger. The solvent introduced atop the tube flows downward, forming a thin film on the surface tube. As it gets heated further, the vapors get generated. It increases the heat transfer for the process. Falling film evaporators are low cost and have high heat transfer efficiency, but disadvantages include high headroom, unsuitability for certain materials, and the need for recirculation.

Forced Circulation Evaporators
A forced Circulation Evaporator is a type of evaporator that requires the addition of a pump and additional controls. It is mostly used in cases where the feed contains solids or crystallization is present. And also used to separate mixtures that are not possible by normal evaporating units. A forced circular evaporator boosts liquid flow to 2-6m/s using a circulation pump, serving dual roles in heat exchange and flash separation. Therefore, it separates the mixture without using normal conventional boiling. So, it consists of a vertical shell and a heat exchanger tube with a centrifugal pump. Forced Circulation Evaporators offer high efficiency and reduced fouling but entail drawbacks like higher costs, increased power usage, and time-intensive processes.

LTV Evaporators
Long tube vertical (LTV) refers to a type of evaporator, also recognized as a rising film evaporator. Hence, LTV Evaporators are one of the most used evaporators. A liquid separator is attached to a shell and tube heat exchanger. The rising film evaporator is very similar to the falling film evaporator. It’s just the opposite of a falling film. It also consists of a vertical shell and a tube heat exchanger for heat exchange. The solvent is fed at the bottom of the tube. As the heat increases further, it generates vapors that lift the liquid upward. Moreover, the process is completed as a result. The advantages of LTV Evaporator are less floor space requirements, high heat transfer efficiency, and the ability to handle foamy liquids. The common disadvantages of LTV Evaporators are they require high headroom, and higher pressure required.

Plate Evaporators
In the process of evaporation, a Plate Evaporator facilitates the flow of a thin liquid film between its plates. Also referred to as gasket plate and frame evaporator, Plate Evaporator types are constructed by arranging multiple plates with corner openings between a top and bottom bar. Therefore, the Plate Evaporator, a type of plate and frame heat exchanger, finds extensive use in the food and beverage industry. Plate Evaporators offer several advantages, including adaptability to various materials, low required headroom, ease of cleaning, and modification. However, a significant drawback of Plate Evaporator is the presence of a large gasket area, which may lead to potential leakage if the gasket is not appropriately selected.

Mechanical Vapor Recompression (MVR)
Mechanical Vapor Recompression (MVR) compresses water vapor, causing an increase in temperature and pressure in this type of evaporator. The rise in temperature makes the temperature difference between the vapor and the fluid. The further heat transfer results in the heat exchanger. Hence, the compressed vapor is again fed back to generate more steam. This is an energy-efficient and energy-recovery process.

Selecting Evaporators for Process Applications

Heat sensitivity
Many foods, pharmaceuticals, chemicals and resins are heat- or temperature-sensitive and require either low heating temperatures or a short residence time exposed to the heat, or both. This can be accomplished by a combination of minimizing the volume of product in the evaporator at any one time, minimizing the time in the evaporator, and reducing the product’s bulk boiling temperature by operating the evaporator at reduced pressures. Reducing the internal operating pressure may also allow operation at lower heating temperatures while still maintaining a reasonable heat-transfer driving force (the temperature difference between the boiling point of the bulk product and the temperature of the heating medium).

Fouling
Fouling of the heat transfer surfaces is usually caused by solids in the feed, precipitating solids in the concentrate, or degradation of the product. A slow buildup of a film on the heat transfer surfaces will cause a gradual reduction in the overall heat-transfer coefficient. Eventually, this will require shutdown of the process and cleaning of the heat transfer surfaces, which results in production downtime and additional maintenance labor.

Foaming
Product foaming during vaporization is common. It may range from a small amount of unstable foam that breaks easily to a very stable foam that is difficult to break and tends to fill the entire void of the evaporator system. Foaming can often be minimized by special designs for the feed inlet (separation of feed from the vapor stream) and the vapor/liquid separation area(special disengaging designs). Also, reducing the boiling intensity of the liquid on the heat transfer surface (by operating at a lower temperature or at higher pressure) and reducing the vapor velocity in the tubes may significantly reduce foaming. Where the product purity specifications allow, the introduction of an antifoam may solve or greatly reduce the problem.

Solids
The properties of the concentrate may change as the solids concentration increases. Solids may plug tubes, causing loss of heat transfer surface, in turn resulting in reduced heat-transfer rates and requiring downtime for cleaning. Solids increase the tendency to foul the heating surface, which reduces the heat-transfer coefficient and boil-up rate. An increase in solids may also increase the concentrate viscosity, which affects the overall heat-transfer coefficient, reducing capacity.

Viscosity
Any increase in the viscosity of the concentrate will reduce the overall heat-transfer coefficient.

Distillate-to-concentrate ratio
In general, there must be enough liquid passing through the evaporator to keep the heat-ed walls wet. Lack of wall wetting and fluid velocity may cause serious fouling and salting of solids on the heat transfer surfaces, causing reduced heat transfer and possible product quality degradation as a result of hot spots on the heating surface. In processes where high distillate-to-concentrate ratios are required, recycling of some amount of the concentrate may be required.

Distillate vapor velocity (pressure drop and entrainment)
Consideration must be given to the vapor velocity in the evaporator tubes and heating jackets. Adequate velocities are needed to produce sufficient heat-transfer coefficients without exceeding limitations on pressure drop, erosion and entrainment. Careful attention must be paid to the requirements of the vapor/liquid separator for separation efficiency and pressure drop.

Heat transfer medium
The heat transfer medium (hot oil or steam) may impact the selection of the type of evaporator. Liquid-heated evaporators typically have lower overall heat-transfer coefficients and require more heat transfer area. If the product is temperature-stable, then hot oil heating may allow higher temperatures and overcome the lower heat-transfer coefficient. This, in some cases, could allow the use of a smaller evaporator.

Required materials of construction (reactivity)
A major consideration in evaporator selection may be the required materials for construction. The heat-transfer surface material is extremely important, because it not only affects the overall material cost but also determines the thermal conductivity of the material, which impacts the overall heat-transfer coefficient and the required surface area.

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Frequently Asked Questions

Q: What materials are commonly used in the construction of evaporators?

A: The evaporator capacity obtained by the use of copper, brass or aluminum is considerably greater than that of iron, steel or lead. Aluminum and brass are able to transmit the heat very nearly at the same rate as copper.

Q: What is the typical capacity range for evaporators?

A: Within the normal operating range of approximately 5F – 20F TDs, the relationship between coil performance and TD is close to linear, which means that if you are given an evaporator rating of 11,400 Btu/hour at a 10F TD, the same coil is going to have a capacity of approximately 22,800 Btu/hour at a 20F TD (it isn’t quite linear and manufactures often provide some small correction factors but it is usually close in this range).

Q: How does the design of an evaporator affect its performance?

A: The design of the evaporator can impact how efficiently it operates, as well as how easy it is to maintain. Design factors include heat exchanger type, evaporator shape/size, and construction materials.

Q: What role do baffles play in the operation of evaporators?

A: Prevent the effects of steam starvation, which is increased with both fluid velocity and the length of the exchanger. Direct shell-side fluid flow along the tube field. This increases fluid velocity and the effective heat transfer coefficient of the exchanger.

Q: Are there energy-efficient options available for evaporators?

A: Look for evaporators that are designed for high efficiency, with features such as optimized coil design, variable speed fans, and advanced control systems. By choosing an energy-efficient evaporator, you can reduce your system's energy consumption, lower your utility bills, and minimize your environmental impact.

Q: How do you prevent scale buildup on evaporator surfaces?

A: Attempts to reduce scale formation have included (a) the use of chemical anti-scalants that affect the solubility of the scale components, (b) magnetic pre-treatment of the juice to affect the ionic behaviour of scale components and (c) the use of ion exchange resins to remove scale components from the juice before evaporation.

Q: What are the best practices for operating evaporators to maximize efficiency?

A: Maintain optimal temperature and pressure, monitor the evaporator, and clean equipment regularly for efficient operation. Applying chemicals, like anti-scaling agents, boosts evaporator efficiency by preventing build-up or foaming in the liquid.

Q: How do you choose between different evaporator designs for your application?

A: Choosing the right evaporator involves considering several factors, including the type of application, the desired cooling capacity, and the specific environmental conditions in which the system will operate.

Q: How do you ensure proper heat transfer in evaporators?

A: Steam condensation irregularities on the tube's outer surface can also have an influence on heat transfer. By ensuring that condensate levels do not rise above the outlet nozzles via draining and venting of non-condensable, this problem can be prevented.

Q: What are the maintenance requirements for evaporators?

A: Clean the evaporator coils, fins, and tubes with a soft brush, vacuum, or compressed air. Avoid using harsh chemicals or abrasive tools that can damage the evaporator surface or cause leaks. Check the evaporator drain pan and line for clogs, leaks, or algae growth.

Q: How often should evaporators be inspected for maintenance?

A: In time, however, the evaporator coil will still collect dirt. This dirt reduces airflow and insulates the coil, reducing its ability to absorb heat. To avoid this problem, check your evaporator coil every year and clean it as necessary.

Q: What are the benefits of using titanium evaporators in corrosive environments?

A: Titanium, a metal well known for its strength, lightweight and durability, possesses qualities that grant it high resistance against the corrosive nature of aquatic environments.

Q: What are the considerations for selecting the appropriate refrigerant for evaporators?

A: A core consideration in refrigerant choice is its environmental impact. This impact includes a refrigerant's ozone-depleting potential (ODP*1) and its potential global warming impact: this is expressed as its CO2 equivalent, which is the refrigerant quantity multiplied with its global warming potential (GWP*2).

Q: What are the benefits of using mechanical vapor recompression (MVR) evaporators over traditional types?

A: Main Features: MVR energy-saving evaporation technology is the most advanced technology at present, only needs a very small amount of steam (small steam required during start-up, almost no need for steam during normal operation), greatly reduces the operation cost, and reduces environment pollution.

Q: How do you ensure proper temperature control in evaporators?

A: Thermostatic Expansion Valves (TEVs) or other throttling devices: By adjusting the flow of refrigerant into the evaporator, the temperature can be controlled effectively. The TEV responds to the temperature of the refrigerant at the evaporator outlet and adjusts the flow to maintain a set superheat level.

Q: What are the benefits of using multiple-effect evaporators over single-effect types?

A: The benefits of multiple-effect evaporators include their suitability for large-scale and continuous operation. When compared to a single effect, it is extremely cost-effective. Multiple effects are employed to reduce the amount of energy required to evaporate unwanted water content.

Q: How do you optimize the steam economy in evaporators?

A: Conclusion: The primary way to improve an evaporator's steam economy is to reuse the latent heat of the water vapour. And, one effect's water vapor heats the next with a lower boiling point; Reuse latent heat by thermally or mechanically compressing it, restricted by liquid feed properties.

Q: How do you prevent carryover in evaporator systems?

A: The vapor body design must be large enough to prevent any carryover of the evaporator liquid with the vapor stream as it leaves the vapor body. Conservative design (i.e. large diameter) in this area will pay for itself in the future in reduced operating problems and water treatment costs.

Q: What are the options for cleaning and descaling evaporators?

A: Up to the present time, caustic soda remains the most widely used reagent for descaling sugar industry evaporators. Understanding the scale's composition assists in determining which kinds of cleaners can effectively clean the evaporators.

Q: What are the benefits of using energy recovery systems with evaporators?

A: The benefits of using energy recovery systems with evaporators include significant cost savings on energy consumption, as these systems can effectively reclaim and reuse waste heat from the evaporation process. This leads to improved overall efficiency and reduced operational expenses. Additionally, energy recovery systems contribute to environmental sustainability by minimizing greenhouse gas emissions and reducing the carbon footprint of industrial processes. They also enhance the reliability and lifespan of evaporators by maintaining optimal operating temperatures and reducing thermal stress on equipment. Furthermore, integrating energy recovery systems can help meet regulatory compliance for energy conservation standards, potentially qualifying businesses for tax incentives or grants. Overall, energy recovery systems offer a strategic advantage in optimizing resource utilization and promoting a greener manufacturing approach.

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