 Friends, myself, Professor S. P. Mankani, Assistant Professor, Department of Mechanical Engineering, Walton Institute of Technology, Solaapur. Today, we are going to discuss Benson Boiler Working. At the end of this lecture, students will be able to understand working of Benson Boiler. So, here this Benson Boiler, the importance we are going to understand first, then we will go for the working. So, it is a high pressure boiler, drumless water tube boiler using force circulation. So, drumless, the word they are going to be using it with the intention that in the case of this Lamont boiler, we are having as a separating drum, so that is not in this particular Benson Boiler. So, because of this one, the total weight of the boiler is going to be reduced. And here, this one more the word you are going to be using it as the water to boiler means the water is going to be flowing through the pipes, then the flue gases is going to be surrounding the pipeline. So, using forced circulation, we are going to be sending the water inside the boiler pipelines at a higher pressure, at a critical pressure level, we are going to send the water. So, in this, the feed water enters at one end, research the superheated steam at the other end. The feed water passes through the economizer. So, this is just similar to the Lamont boiler with the economizer part of it is concerned. The thermal efficiency up to 90 percent is may be achieved. The major advantage of this one is average operating pressure and the capacity are 250 to 135 tons per hour production part of steam is concerned. So, the one more important thing as it can be started within 10 to 15 minutes of this particular boiler working. So, it is a lightweight boiler. The reason is that here you do not have a drum. So, that is the reason I have quoted in the first time also, this one drumless. That is the reason it is a lightweight boiler. And because of that one, it is a less cost. So, coming to this particularly the working here, this is the blower you are going to be using from the blower the natural air, cold air is going to be circulated through this particular blower. Blower is going to send the air to the air preheater. The air preheater is going to utilize the heat energy at the exhaust level of this Benson boiler means the finer part of the heat energy are going to be utilizing before it is sending it to the atmosphere. So, that is the positive part is the energy unnecessary wastage and apart from that we are going to be adding continuously the heat energy to the atmospheric and it may create some other additional problems. And we are going to be utilizing that heat energy that is the economic part of it is concerned. So, here the hot air we are going to send it directly to the combustion chamber. The hot air we are going to send it directly to the combustion chamber. The detail part of this one I have covered it in the previous lecture also why you are going to be using as a hot air is concerned. So, coming to this one as water from the hot well is going to send through this feed pump to the economizer. So, before going with the actual working of this one just you can observe here. So, this is a radiant evaporator and this is a super heater and this is a convective evaporator and then this is economizer then this is the air preheater. So, means the whatever the energy you are going to get it from the combustion chamber. So, this total we are going to be calling this particularly as a Benson chamber. So, in the total Benson chamber there is a one part to second this is second third and fourth and fifth. So, in this part wise we are going to be utilizing the heat energy. So, now the feed water comes to this particular pipeline and that is a economizer. Economizer only give the additional heat energy to the water, additional heat energy to the water. So, that we can increase the temperature of the water and that too with the high pressure water is coming. So, in through this particularly pumps pipes supposed to be there the water bubbles are going to be locating inside the pipe. So, that to avoid that damages to the pipe as well as the energy loss. We are going to be using the water at a high pressure. So, means there will not be any bubble creation inside the pipe it will be forced to flow in the next portion. So, that will come to the radiant evaporator. In this particular the combustion chamber the first part of the combustion chamber energy is going to be utilized by the radiant evaporator. So, after utilizing the maximum part of the energy. So, then it comes to this one as a next part as a convective evaporator. It comes to the convective evaporator. So, here the final particles that is a water some part of the water molecule supposed to be there that is going to be removed here and then it passes to the superheated stage. This portion just you can observe it in the superheated stage. It is just above the radiant evaporator means here it is there at a higher temperature the flue gases are flowing. So, there will not be any water content in the steam in this particular portion. So, we are going to be removing all the particles of the water. So, that we are going to get a dry superheated steam. So, which is coming through this one as a in the outside we are going to be using it for the steam to the prime mover. The prime mover is going to be coupled for the particularly the for the purpose of the production of electrical energy. This is coupled to the turbine. So, this part we are not going to discuss in detail as far as the Benson chamber and the working of Benson boiler. So, here just you can observe there is one small this question for you. So, you are not observing the one part one important part compare with the Lamont boiler. Can you give me the name of that one? So, that is a part of here that I have shown in the previously the case of Lamont boiler as a steam separating drum. So, that part is not available in this one that is a major advantage of the Benson boiler that is a major advantage of the Benson boiler. And because of that total weight of the Benson boiler is going to be reduced and the cost of the boiler is also going to be reduced. So, due to that particular the separating steam separating drum is concerned. So, now just I am going to explain with the how exactly the water is going to be flowing through this particular pipelines. Just you can observe the arrow mark is representing the flow path of the water to the superheated steam. So, just you can observe here. So, here in this blower starts working. So, that the air is going to be sucked from the atmosphere. Then it will come to the air preheater. And here the surface is their additional surface they are provided to utilize the heat energy as a fins. As a fins that energy is going to be utilized here. Then the hot air given to the combustion chamber directly. The water at a high pressure comes to this particularly the arrow mark just you can observe it. So, then it comes to the radiant heater then radiant evaporator then it comes to the convective operator. So, this one just you can repetition once again I am going to show it. So, that you can observe it the how exactly the working is going to be taken place. I will just repeat it just you can observe the arrow mark the flow path of the water at a higher pressure. So, this will come to the convective operator. So, after that it comes to the superheated. There will not be any moisture after this passing through this particularly pipeline it will come to the prime over. So, here just the remaining and the flue gases are going to send it to the atmosphere through the chimney. Further part will be covered in next lecture. Thank you.