What is a Benson Boiler : Working, Construction, Properties & Defects

Hello friends, today I am going to tell you What is a Benson Boiler?, What is Benson Boiler, Working of Benson Boiler, Defects of Benson Boiler, Properties of Benson Boiler:If you also want to know, then keep reading this article completely.

What is a Benson Boiler?

In the La-Mont boiler it was observed that in the formation of steam from water, bubbles are formed which stick to the inner surface of the heating tubes. These bubbles greatly reduce the rate of evaporation. Along with this, due to the formation of bubbles, there is a lot of elevation in the water level. Benson stated in 1972 that if the pressure of water is converted into steam by increasing the critical pressure, then bubbles will not form because the density of steam and water is equal at this pressure. Evaporation enthalpy is not required for steam generation at this pressure.

What is a Benson Boiler?

The first high pressure Benson boiler was made in 1927 by Siemens Company, Germany. There is no water or steam drum in this type of boiler. This is a path boiler. They have only tubes. It is a very critical pressure, vertical water pipe boiler. Its furnace is cooled by water tubes. In this, mostly pulverized coal is used as fuel. In this, oil or gas is also used as fuel. Gas fired boilers are also installed in Romania and many countries of Europe. The pulverized coal is thrown into the furnace by a burner. The feed pump sends water at a pressure higher than the boiler pressure to the economizer. Here it is heated on the flammable gases going out of the boiler. In this the incoming air is also heated by the flammable gases in an air preheater. This air preheater is installed after the Mitpyozitr.

Most of the water gets converted into steam at the metope. The mitoperator acts as an evaporator. First the water radiation enters the evaporator, and finally the convection comes into the evaporator. The rest of the water evaporates into these evaporators. The saturated steam produced at high pressure later flows through an overlap. This overlap is located in the hottest part of the furnace. The superheated steam expelled from the overlap is sent to the first conductor. The primary and secondary air required for combustion is provided by forced flow fans. In this, an inspired fan sucks the flammable gases from the air preheater and throws it out of the chimney.

At high pressure the entropy of steam decreases. Thus this high pressure steam is propagated in the pub steam turbine. So the steam gets wet which leads to decay of turbine vanes. Therefore, to prevent this loss, the steam is insulated from 140 to 150 bar through a stop valve before sending it to the turbine.

This boiler consists of many parallel circuits, due to which the thermal efficiency of the boiler is up to 91%.

Benson boilers have been designed and are being used for the capacity of up to 150 tonnech steam at 500 bar pressure and 650 °C temperature.

Working of Benson Boiler

This is a water tube boiler. Water in this boiler is filled at critical pressure (225 kg/cm2). There is a water pump in it which is called feed pump. Water from it is sent to the economiser at 225 kg/cm2 pressure. In the economiser, the water does not heat up and reaches the radiate evaporator, where the water is heated, but evaporation does not take place. For evaporation, tubes are sent to the evaporator where the temperature of the water becomes high and the evaporation process starts, at this critical pressure the evaporation of water takes place without latent temperature. Hence the water instantly turns into steam. The steam is then sent to super heated tubes to raise the steam temperature further.

In today’s Benson boiler, steam is prepared at 500 kg/cm pressure and 650 °C temperature. Thus the biggest advantage of steaming at very high pressure is that the size of the benson boiler becomes very small. But raising the water pressure requires a lot of energy. The result of this is that the efficiency of the boiler is reduced. In this way the steam production rate/hours of benson boiler increases a lot as compared to other boilers. Modern benson boiler produces steam at the rate of 150 ton/hours.

The valve is used to start the boiler. Hot water is repeatedly passed through the economiser, evaporator and superheater tubes. When the water temperature rises and steam begins to form, one valve is closed and the other one is opened.

This boiler has a parallel tubes circuit, which increases the thermal efficiency of the boiler up to 91%. These steams of 500 bar pressure and 650 °C temperature have been made and are being used for capacity up to 150 ton/hour. 

Properties of Benson Boiler

This boiler has the following properties,

  1. the starting cost of these boilers is low.
  2. These boilers can be installed easily and quickly, as all the parts are welded at the boiler installation location. 
  3. Boiler requires less floor area. These boilers can be started quickly. 4. Explosion does not cause much damage, because the storage capacity of the boiler is less due to lack of water drum. 

Defects of  Benson Boiler

This boiler has the following drawbacks. The tubes are

  1. difficult to clean. 
  2. When the water flow is low, the tubes become overheated.

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