Desuperheater – Types, Working and Applications | Maniks

Introduction

Desuperheater is a high efficiency and superior quality product of Maniks. The essential capacity of a desuperheater is to bring down the temperature of superheated steam or other vapors. For the effective temperature diminishment we use a spray of water into the steam pipe this will form a coordinate contact of steam with water or another fluid, For example, water because of which we obtain temperature diminishment. It will dissipate the infused water.

desuperheater water heater
Desuperheater Water Heater

The term desuperheating means attemperation or steam conditioning which actually used to reduce steam temperature in a high heat generation plants. To obtain temperature diminishment we sprinkle water into the pipe. This water vaporizes with superheated steam and produces steady-state output at the end.

Need of Desuperheater

Desuperheater plays a very important role in boilers and heat generation systems. They reduce the temperature of the superheated steam and reuse the heat energy to some other applications. There are two advantages of reduction of this steam temperature.

  1. The downstream process equipment designed to work at a low temperature. To obtain this criterion we require desuperheater.
  2. Maintain a constant temperature for further processor applications

Working Principle

Desuperheater works on a very simple principle it decreases the steam temperature with the help of water. The spray of water decreases the temperature of the superheated steam. When this water comes in direct contact with the superheated steam, evaporation process takes place & steam temperature reduces at the outlet. When we inject water to the superheated steam some water droplets accumulated on the inner surface of the wall. The use of hot water spray preferred to remove these water droplets. The temperature of this hot water determined from the temperature of the superheated steam. The use of hot water spray for injection into steam pipe avoids the accumulation of water droplets inside the pipe. The temperature of the hot water should be near to saturation temperature of the steam.

Types of Desuperheater

There are four types of desuperheaters available

  • Indirect contact type- The medium used to cool the superheated steam does not come into coordinate contact with it. The cooling medium is a liquid or gas instead of surrounding air. These kinds of desuperheater is shell and tube heat exchangers.
  • Direct contact type – The medium used to cool the superheated steam comes into coordinate contact with it. In most cases, the cooling medium is the same fluid as that of the vapors to desuperheated, but in the liquid state. Steam desuperheater uses water as a cooling medium.
  • Integral type- Desuperheater is in-built with actuator so that there is no need to separate spray water valve
  • Non Integral type- Desuperheater nozzle and water valve are separate units

Maniks Desuperheater

Maniks are having comprehensive range of desuperheater supply since last three decades. They introduced variety of desuperheaters with precise temperature control for various applications in chemical or oil & gas process plants where the available refrigerant is at superheated conditions.The desuperheater produced my Maniks uses ammonia water as a super heater liquid and its main purpose to design to used in refrigeration systems to maintain the temperature inside it.

In the normal refrigeration cycle, a refrigerant gas such as ammonia, Freon compressed in a compressor, passes through a condenser where it gives off heat and changes to a liquid state and then passed through an expansion valve to an evaporator coil to absorb heat and change the refrigerant back to a gaseous state for’ recompressing in the compressor to complete the refrigeration cycle.

The evaporator coil positioned within a refrigerated box, display case, or cabinet and the heat absorbed by the refrigerant passing through the coil serves to extract heat from the refrigerated box and its contents to maintain the box at the desired temperature. As is well known, this extracting of heat from the refrigerated box’ and its contents causes frost to form on the evaporator coil and refrigerated box which periodically must removed to maintain proper functioning of the evaporator coil and avoid undesirable build-up of frost on the coil or other parts of the refrigerated box.

Design of desuperheater

Double Walled “Tube in Tube “, vented, counter flow heat exchanger. Vent tube having serrations on inner & outer surfaces to avoid cross contamination of refrigerant and water/ fluid. Each tube has a tube inside that allows water/ fluid to travel in an opposite direction.

Installation Process

The Desuperheater Water Heater introduced before the condenser and the oil separator. The refrigerant goes through the arrangement of tubes in the Desuperheater before entering the condenser. Regularly the Desuperheater Water heater outlines the high temp water as a prerequisite for the procedures. At the point when necessities of boiling water and refrigeration are not concurrent, a “Recirculation” type framework is given wherein high temp water is produced, put away and kept up in a protected tank. This heated water at that point can used as and when required.

The Desuperheater water radiator can effortlessly retrofitted on responding, parchment or screw write chillers.

Actual Working

 Desuperheater conveys superheated steam into facilitate contact with water the steam gets cooled through the vanishing it decreases the temperature of the steam.

Maniks desuperheater specially intended to work in a refrigeration system so it uses noticing salts water inside to cool the refrigerant gas. Right when refrigerant gas in a refrigeration structure is compacted in a compressor it passes however a condenser where it emanates heat and changes to a liquid state and after that it experiences an augmentation valve to an evaporator twist to hold heat and change the refrigerant back to vaporous state for recompressing in the compressor to complete and the refrigeration cycle. This cycle continuously repeats in refrigeration structures.

The evaporator twist is arranged inside a refrigerated box, indicate case, or agency and the glow absorbed by the refrigerant experiencing the circle serves to remove warm from the refrigerated box and its substance to keep up the case at the desired temperature.

Advantages

Maniks desuperheater has number of advantageous points. Following list shows some of them

  • Reduction in condenser pumps power consumption.
  • Minimal pressure drop
  • Compact designs
  • Design code compliant
  • Range of outlet superheat capabilities
  • Variety of standard materials
  • Horizontal or vertical orientation with upward flow

Applications

Many applications use desuperheater as a energy exchanger. Following are some day today applications

  • HOTELS and HOSPITALS:

Water for Bathing/Sterilizing/Kitchens/Laundries

  • PHARMACEUTICAL and CHEMICAL:

Dehumidifiers/Calorifiers/Autoclaves/Boiler feed/Air Preheating/Tablate Coating Machines

  • DAIRY and FOOD PROCESSING:

Sterile Washing and Cleaning/Boiler Feed/Chocolate Tracing/Powder Drying/Dehumidifiers

  • TEXTILE:

Dehumidifiers/Yarn Drying/Preheating/Boiler Feed

  • ENGINEERING and AUTOMOBILE:

Heater Feed/Degreasing/Washing and Cleaning/Paint Shop Processes

 

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