Do-it-yourself boiler

With rising fuel prices, people are increasingly becoming interested in alternative cheap energy sources. One of these resources is used oils and other petroleum products, which are utilized in large quantities by modern society. Instead of spending money on recycling, bright heads came up with how to use them as fuel. This idea is the basis for the development of heating boilers for development.

Design of the boiler at work

There are several main types of waste oil boilers; they differ in the way they burn fuel, the number of thermal circuits and the degree of automation of the device. Regardless of this, the design of all devices, both industrial and self-made, is identical, and is based on the same physical principles.

The principle of operation of the device

We will consider the basic principle of operation using an example of a boiler of the most common type - with a drip supply of oil to the combustion bowl and forced air injection. The design of these boilers is very reliable, it has proved its effectiveness in practice, and, most importantly, it is easy to repeat it with your own hands.

The main element of the device is the combustion cup, into which the used oil is supplied drop by drop by gravity and the air flow is forced. The oil, falling onto a red-hot bowl, instantly evaporates, the vapors formed in this case, together with the flow of injected air, are supplied to the combustion chamber, where they are burned at high temperature and generate a large amount of heat. The generated heat heats the coolant in the boiler, which provides space heating. The resulting combustion products are discharged through the chimney.

The main thing that should be noted is that for normal operation of the boiler, a large amount of fresh air and a high temperature in the combustion chamber are necessary, which ensures the complete burning of used oil without emitting harmful substances.

TIP! Do not take air into the combustion chamber from the room. It is most rational to make it from the street, providing a preliminary heating of the supplied air.

Boiler design diagram

Before you start creating a boiler for yourself, you must clearly determine which type of boiler is most suitable for you. This primarily depends on the tasks that you plan to assign to the created heating device. So for heating a small garage, a direct heating boiler is quite enough, without a water heat exchanger and a complex system for regulating performance.

If you plan to use the boiler with used oil as a heat source for heating several rooms or a greenhouse, then a water heat exchanger will already be present in the boiler. The most advanced design will turn out to simultaneously solve the problems of heating and hot water production. In this article, we will consider the production of the most common heating equipment with a single liquid coolant circuit.

Preparation of tools and materials

The boiler manufacturing process begins with the preparation of the necessary materials and tools.

For production, you will need the following tools:

  • Welding machine;
  • Angle grinder;
  • Drill;
  • A set of hand tools (hammer, pliers, files, etc.)

From materials and equipment:

  • Forced air fan (usually use car snails);
  • Pipe with a diameter of 110-120 mm;
  • Pipes with a diameter of 32 mm (wall thickness from 3.5 mm);
  • Stainless steel pipe with a diameter of 8-10 mm;
  • Fittings for connecting a water circuit;
  • Old 10 liter oxygen tank;
  • Old propane tank of 50 liters;
  • Sheet metal 3 and 4 mm;
  • Asbestos cord.

IMPORTANT! Making a boiler with your own hands involves a large amount of welding work. Welds must be of high quality and ensure the tightness of the device. If you are not confident in your abilities, invite an experienced welder to help.

DIY assembly

The device is assembled in accordance with the scheme given in the first part of the article.

First of all, we make the device body, for which we need the cylindrical part of the propane cylinder. Using an angle grinder, separate the bottom and the upper spherical part from the tank (cut off parts, we still need them).

IMPORTANT! When working with gas cylinders do not forget about safety. Before you begin to perform any actions with them, soak them filled with water for a day.

We proceed to the manufacture of the combustion chamber and heat exchanger. As the combustion chamber we use the body of the oxygen cylinder, for flame tubes we use a pipe with a diameter of 32 mm. Cut the components to approximately 70 cm and weld the heat exchanger using a sheet of metal 4 mm thick as the basis. As a result, you should get the design as in the figure below.

Insert the finished heat exchanger into the boiler body and connect the components by welding, and then weld on the side of the fitting for connection to the water circuit and a 110 mm pipe as a chimney. Weld the lower part to the body, having previously made an inspection hatch with a cover in it.

It's time to make an afterburner - it is a pipe with a diameter of 32 mm with drilled holes with a diameter of 3-5 mm through which air is pumped into the combustion chamber with a fan, a tube with a diameter of 8-10 mm is placed inside it for oil supply. The top of the propane cylinder is fixed on top of the afterburner.

It remains to assemble all the parts together, seal the joints with an asbestos cord and attach the fan. The result should be a design, as in the figure.

Then you can fill the system with water, make sure its tightness and make a trial run.

In compliance with safety requirements and proper operation, a do-it-yourself boiler will serve you for many years.

Watch the video: gas boiler replacement from start to finish (March 2024).

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