Dgxt Replacement Plate Heat Exchanger

• Customized: Customized
• Certification: CE, ISO, RoHS
• Sectional Shape: Square
• Material: Stainless Steel
• Transport Package: Wooden Case
• Specification: Stainless Steel
• Model NO.: SS316
• Trademark: DGXT OR OEM
• Origin: China
• HS Code: 84195000
• Production Capacity: 100000pieces/Year

Product Description

                                                                            Swep plate heat exchanger

 

Heat transfer

 

The law of physics always allows the driving energy in a system to flow until equilibrium. Heat dissipates when there is a temperature difference.

 

A heat exchanger follows the equalisation principle. With a plate heat exchanger, heat cuts through the surface and separates the hot medium from the cold. Thus, heating and cooling fluids and gases use minimal energy levels.

 

The theory of heat transfer between mediums and fluids happens when: 

 

• Heat is always transferred from a hot medium to a cold medium.
• There must always be a temperature difference between the mediums.
• The heat lost from the hot medium is equal to the amount of heat gained by the cold medium. 

About heat exchanger

A heat exchanger is a piece of equipment that transfers heat from one medium to another.

There are two main types of heat exchanger:

• Direct heat exchange, where both mediums are in direct contact with each other. Eg - A cooling tower where water cools through direct contact with air.
• Indirect heat exchange though divided media.

plate heat exchanger
 

The design of a plate heat exchanger (PHE) comprises several heat transfer plates. Held by a fixed plate and a loose pressure plate to form a complete unit. Each heat transfer plate has a gasket arrangement, providing two separate channel systems.

 

The arrangement of the gaskets allows through flow in single channels. This enables the primary and secondary media in a counter-current flow. The mediums are not mixed because of the gasket design.

 

The corrugated plates create turbulence in the fluids as they flow through the unit. This turbulence gives an effective heat transfer coefficient.

 

DGXT has plate heat exchangers for all industries and applications - catering to heating, cooling, heat recovery, condensation, and evaporation. 

• gasketed plate-and-frame type heat exchangers
• Industrial line range
• semi welded industrial line-typed plate heat exchanger
• Welded plate-and-block heat exchangers e.g. DGXT Compabloc
• Welded plate-and-shell heat exchangers e.g. DGXT DuroShell and Packinox
• Welded spiral heat exchangers

DGXT  innovative solutions are sustainable. Optimising technology for energy efficiency, emission reduction, and recovery of waste and water.

The design of a plate heat exchanger (PHE) comprises several heat transfer plates. Held by a fixed plate and a loose pressure plate to form a complete unit. Each heat transfer plate has a gasket arrangement, providing two separate channel systems.

 

The arrangement of the gaskets allows through flow in single channels. This enables the primary and secondary media in a counter-current flow. The mediums are not mixed because of the gasket design.

 

The corrugated plates create turbulence in the fluids as they flow through the unit. This turbulence gives an effective heat transfer coefficient.

 

DGXT has plate heat exchangers for all industries and applications - catering to heating, cooling, heat recovery, condensation, and evaporation. 

• gasketed plate-and-frame type heat exchangers
• Industrial line range
• semi welded industrial line-typed plate heat exchanger
• Welded plate-and-block heat exchangers e.g. DGXT Compabloc
• Welded plate-and-shell heat exchangers e.g. DGXT DuroShell and Packinox
• Welded spiral heat exchangers

DGXT  innovative solutions are sustainable. Optimising technology for energy efficiency, emission reduction, and recovery of waste and water.



it works
Gasketed plate heat exchangers (GPHE) optimises heat transfer. The corrugated plates provide easy heat transfer from one gas or liquid to the other.

 

Plates for a gasketed plate heat exchanger are with elastomeric gaskets. These seal the channels and direct the mediums into alternate channels. The plate pack is between the frame plate and a pressure plate. It's then compressed with bolts between the plates. The upper carrying bar supports the channel and pressure plate. They are then fixed in a position by a lower guiding bar on the support column. This design is easy to clean and modified (by removing or adding plates).

 

Here are three steps to assemble a gasketed plate heat exchanger:

 

The heat transfer area of a gasketed plate heat exchanger is from corrugated plates. These are between the frame and pressure plates. The gaskets act as seals between the plates. 

 

Fluids run counter-current through the heat exchanger. This gives the most efficient thermal performance. It also enables a very close temperature approach. For instance, the temperature difference between the entering and exiting service mediums. 

 

For heat-sensitive or viscous media, cold fluid convenes with hot fluid. This minimises the risk of the media from overheating or freezing.

 

Plates are available in various pressing depths, chevron angled pattern, and corrugated shapes. All designed for optimal performance. Depending on the application, each product range has its specific plate features.

 

The distribution area ensures fluids flow to the entire heat transfer surface. This helps to avoid stagnant zones that may cause fouling.

 

High flow turbulence between plates results in higher heat transfer and pressure drop. DGXT Laval thermal designs are customisable. To suit various applications for the greatest thermal performance with the least pressure drop.

 

With the various type of gasketed plate heat exchanger available, there are advantages and disadvantages of choosing a gasketed plate heat exchanger:

 

Advantages of plate heat exchanger:

1. Heat transfer precision - improved temperature approach, true counter-current flow, 80-90% less hold-up volume.
2. Low cost - low capital investment, installation costs, limited maintenance and operating costs.
3. Greatest reliability - less fouling, stress, wear, and corrosion.
4. Responsible - least energy consumption for most process effect, reduced cleaning.
5. Easy to expand capacity - adjustable plates on existing frames.

 

Here are the two most common types of services.
Troubleshooting a plate heat exchanger, if the following occurs: 

1. A decrease in performance 
2. Unexplainable deviations from the temperature programme or operation requirements 
3. External or internal leakages
4. Disturbances in the process
5. Need for increased capacity
6. High energy consumption

 

Reconditioning of plate heat exchanger:

1. When high thermal performance is vital to the process.
2. For 100% reliability to prolong the heat exchanger lifetime.
3. To restore performance should foul, corrosion or leakage occurs.

 

THE BENEFITS OF HEAT EXCHANGERS IN PROCESS AND CLEAN-IN-PLACE

 

Food, beverages, and pharmaceutical processing systems require the addition and removal of heat in order to function properly, and processes must be carefully controlled to maintain proper temperatures. Heat exchangers regulate fluid temperatures in processing systems to meet requirements for pasteurization, filling operations, and food safety.

In the food and beverage industry, heat exchangers reduce or eliminate microbials to make products safe for consumption and to prevent spoilage.

Heat exchangers also heat or cool products during a variety of processing stages, including filling, drying, and concentration. To meet processing requirements for a variety of products and their varying viscosities, heat exchangers use innovative designs to maximize efficiency.

 

For example, plate heat exchanger technology is vital to dairy, beverage and processed food applications. They provide the exact combination of temperature and holding time, for precise pasteurization and ultra-high temperature treatment and regeneration in a variety of applications:

• Milk and cheese milk pasteurization
• Ultra-high temperature sterilization
• Beverage and energy drink pasteurization
• Standard and pulpy juice pasteurization
• Beer wort heating and beer cooling
• Liquid egg processing
• Bottled water treatment
• Soups, sauces and starch heating
• Ketchup and mustard heating and cooling

Pharmaceutical, food, and beverage operations realize the value of heat exchangers in several ways:

1. Heat exchangers heat the cleaning fluids that remove residues from systems components.
2. Heat exchangers create consistent temperatures for pasteurizing and Clean-in-place (CIP).
3. They heat water for effective rinsing of food production equipment (tanks and piping).
4. They can be placed on skids for small-footprint, flexible CIP equipment positioning.
5. Heat exchangers themselves are CIP'able because their designs induce turbulence when systems maintain sufficient flow rate.
6. They transfer heat without contaminating the heated fluids.
7. Energy savings: regenerative heat transfer conserves energy by re-using heated fluids to heat fluids in repeatable cycles.

 

SAVE ENERGY WITH HEAT EXCHANGERS

Pasteurization relies on a heat exchanger's ability to recover heat from processed milk. For pasteurization, milk has to be stored at 4°C to prevent microbial growth. During pasteurization, milk is heated to a temperature of 72 °C for at least 15 seconds to kill pathogens, and then chilled back to 4 °C to stop the process and preserve the milk.

The heat of the pasteurized milk is used to warm the cold milk. The incoming cold milk is preheated by the outgoing hot milk, which is simultaneously pre-cooled. This transfer efficiency saves heating and refrigeration energy.

The process is called regenerative heat exchange or heat recovery. As much as 94 - 95% of the heat content of the pasteurized milk can be recycled.

 

Heat exchangers also have an important role in clean-in-place, which is the process of cleaning system components without having to dismantle or open the equipment for cleaning. In CIP, the main purpose of heat exchangers is to heat the cleaning water and solutions to a consistent temperature to aid in the removal of residue.

While performing their functions in processing and CIP, heat exchangers help reduce utility consumption by conserving water, electricity, and steam. Common applications for heat exchangers include processing for biotech and pharmaceutical, chemical, food and beverage, and personal care products.

ADVANTAGES OF EACH TYPE OF HEAT EXCHANGER 

To meet the heating and cooling needs of such an array of applications and products, heat-exchanger designs have evolved to meet a range of site-specific temperature-modulation requirements.

 

FLEXIBLE PLATE AND FRAME HEAT EXCHANGERS

Because plate and frame heat exchangers are designed to increase or decrease in capacity depending on application, they are among the most versatile heat exchangers available.

In addition to variations in height and width that accommodate installation and system integration, plate and frame heat exchangers can scale in depth as system capacities change.

 

EFFICIENT HEAT TRANSFER OF SHELL AND TUBE HEAT EXCHANGERS

Processors use shell-and-tube heat exchangers for general product heating and cooling. The high shear force and turbulence of their design minimize the risk of biofilm build-up and ensure efficient heat transfer. One manufacturer's Pharma-line of shell and tube heat exchanger operates at pressures of up to 10 bar and operating temperatures of 150°C, which makes the heat exchanger easy to drain.

Shell and tube heat exchangers meet the industry's rigorous demands for product hygiene by eliminating the risk of cross-contamination.

DOUBLE-DUTY SCRAPED-SURFACE HEAT EXCHANGERS

By performing heating duties while also scraping interior surfaces to prevent fouling, scraped-surface heat exchangers add value to systems by keeping them running longer between cleaning. In scraped-surface heat exchanger applications, the product enters the cylinder at the bottom and flows upwards. 

The heating or cooling medium travels in a counter-current flow through a narrow annular channel. Typical applications include processing of ketchup, mayonnaise, hummus, chocolate spreads, fruit pie fillings, gravies and sauces, whipped/aerated products, peanut butter, pizza sauces, puddings, salad dressings, and baby food, among others.

Rotating blades continuously remove product from the cylinder wall to ensure uniform heat transfer. The product enters the cylinder in a corkscrew pattern in the same direction as the rotating scraping assembly. The design of scraped surface heat exchangers preserves product quality by providing gentler product handling. Both product flow and rotor speed can be adjusted to suit the properties of the product in the cylinder.

Scraped surface heat exchangers are common in the food and personal care industries. Ensuring continuous production requires uniform heat transfer, but the consistency or content of some food products hinders efficient heat transfer. Scraped-surface heat exchangers meet the need for efficiency by keeping product off the walls and in the mix where they belong.


 

HEAT EXCHANGERS ARE CIP'ABLE

CIP effectiveness is determined by cleaning time, strength of cleaning chemicals, the temperature of cleaning chemicals, and the amount of turbulence, so heat exchangers have a key role to play in operational productivity and effectiveness. 

During CIP, the cleaning solution is pumped through the heat exchanger, where it is heated to the required temperature and where plate designs that facilitate heat transfer also create turbulence that aids in plate cleaning. The solution is then routed to the target system and back to the circulation tank included in the CIP module.


 

PLACING HEAT EXCHANGERS ON SKID FOR SMALL-FOOTPRINT, FLEXIBLE CIP EQUIPMENT POSITIONING

A CIP skid is a custom-built integrated CIP system mounted on a platform for ease of transportation and installation.

Prefabricated skids make efficient use of space for tanks and piping and they ensure easy access by technicians for connecting to processing systems and other components.

Skids vary by tank size, the number of tanks, heating type, valve type, and chemical dosing. They can include plate and frame, shell and tube, or electric heat exchangers.