A fuel gas boiler, as the name suggests, refers to a boiler that can produce both fuel and gas. There used to be no such dual fuel boilers because the burners were either fuel or gas, without dual fuel burners. With the rapid development of global thermal equipment, some European countries have begun to produce and sell fuel and gas burners. The organic combination of dual fuel burners and boilers has given birth to a new type of boiler - fuel and gas boilers.

Classification of oil and gas boiler equipment

Fuel gas boilers are mainly divided into four categories based on their working performance: fuel gas boiling water boilers, fuel gas hot water boilers, fuel gas steam boilers, and fuel gas thermal oil boilers. Hot water or steam is used as thermal energy for consumption or daily life, and common boilers in daily life are boiling water boilers and hot water boilers; Steam boilers are common boilers in industrial boilers. Industrial boilers are widely used in industries such as petrochemicals, textiles, rubber, locomotives, and industrial and mining enterprises.

Condensing fuel gas boiler

Advantages and disadvantages of fuel and gas boilers

The advantage of a fuel gas boiler is that it can continue to operate with fuel when the gas is insufficient or the pressure is too low, without affecting the user's work process. Disadvantages of oil and gas boilers: 1. They are relatively expensive because the dual fuel burners equipped with them are very expensive, resulting in a higher overall quotation for the boiler. 2. The models are incomplete, and there are no smaller models of oil gas dual fuel burners, only models above 0.35MW.

Maintenance of fuel and gas boilers

(1) Dry maintenance method: After the boiler is shut down, drain the boiler water, thoroughly remove the internal dirt, rinse it clean, and dry it in the furnace with low heat (be careful not to use high heat). Then, put the block shaped quicklime with a diameter of 10-30 millimeters into separate trays and place them in the boiler drum, without letting the quicklime come into contact with metal. The weight of quicklime is calculated at 8 kilograms per cubic meter of the boiler drum volume. Then close all manhole and handhole pipeline valves and check them every three months. If the quicklime is in a broken state, it needs to be replaced immediately. When the boiler is restarted, the quicklime and tray should be removed.

(2) Wet maintenance method: After the boiler is shut down, release the boiler water, thoroughly remove the internal dirt, rinse it clean, refill the treated water to full capacity, heat the boiler water to 100 ℃, allow the gas in the water to be discharged from the outside of the boiler, and then close all valves. Moisturizing maintenance method should not be used in cold climates to prevent the boiler water from freezing and damaging the boiler.

Combustion characteristics of fuel and gas boilers

Fuel is a liquid fuel, and its boiling point is always lower than the ignition point, so the combustion of fuel always occurs in a gaseous state. After the atomized fuel particles are sprayed into the furnace, they are heated by the high-temperature flue gas inside the furnace and undergo gasification. The gasified oil and gas meet with oxygen in the surrounding air, forming a flame. Part of the heat generated by combustion is transferred to the oil particles, causing them to continuously vaporize and burn until they are completely burned. The smaller the diameter of the oil particles, the faster the combustion of the oil particles. Similarly, the oxygen required for the combustion of oil particles can be supplied in a timely manner, and the combustion of oil particles will also be faster. Therefore, in order to enhance the combustion of oil, the following points must be achieved:

1. Improve atomization quality and reduce oil particle diameter;

2. Increase the relative velocity between air and oil particles;

3. Reasonable air distribution.