An industrial gas steam boiler has a fire tube boiler and a water tube boiler.
Fire tube boiler: The main body of a water steam boiler with a condenser adopts a single drum, horizontal, and wet back structure. The boiler drum is fixed on the body chassis through fixed and movable supports at both ends, ensuring the longitudinal thermal expansion of the entire boiler. The combustion chamber of the boiler is composed of a corrugated furnace, and the smoke tube bundle is the convection heating of the boiler, and the flue gas forms a three-pass structure.
Water tube boiler: The industrial gas-fired boiler is a double-drum, horizontal, and chamber-fired D-shaped layout structure, with the furnace on the right and the convection tube bundle on the left. The upper and lower drums are fixed on the chassis of the main body through movable supports in the middle of the lower pot and at both ends, ensuring that the boiler expands to both ends as a whole.
The furnace is surrounded by water-cooled walls. The water-cooled wall generally adopts a membrane wall structure. The membrane water-cooled wall on the left side of the furnace completely seals and separates the furnace and the convection tube bundle. The rear part of the convection tube bundle area is a sparse staggered structure (convection tube bundle I zone), and the front part is a sequential structure (convection tube bundle II zone).
Structure of the Gas Fired Steam Boiler
The structure of a gas steam boiler consists of a furnace, drum, tube bundle, burner, economizer, heat exchanger, superheater, etc.
Furnace
The furnace is a crucial part of a steam boiler. It is responsible for heating water and turning it into steam. The furnace is where fuel is burned, creating the heat needed for steam generation.
There are different types of furnaces used in different steam boilers. Each type has its own characteristics and advantages. Some common types include:
Fire-tube Furnaces: These have a big cylindrical shell surrounded by water. Inside the shell, there are fire tubes. Fuel is burned inside the tubes, which heat the water around them.
Water-tube Furnaces: In these boilers, water is inside the tubes, and heat is generated outside. Fuel burns outside the tubes, heating the water inside and creating steam.
Fluidized Bed Furnaces: These furnaces suspend fuel particles in a fluidized bed of air. This makes for efficient combustion and heat transfer.
Burner
The burner is a key part of a steam boiler. It’s responsible for burning fuel and making heat. The burner controls the flow of fuel and makes sure it burns efficiently, making heat.
The kind of burner a boiler has depends on the design of the boiler and what kind of fuel it burns.
There are different types of burners:
Gas Burners: These burners are made to burn natural gas or LPG (liquefied petroleum gas).
Oil Burners: Oil burners are used when a boiler burns liquid fuels like light oil, heavy oil, or diesel.
Dual-fuel Burners: These burners can burn both gas and oil. They let you choose which fuel to use based on what’s available and how much it costs.
It’s important to pick a burner that works with the kind of fuel your boiler can burn. You should also think about how well it burns and how much pollution it makes.
Heat Exchanger
The heat exchanger is a part of a steam boiler that moves heat from the hot gases to the water inside. It helps the thermal energy move, so steam can be made.There are different kinds of heat exchangers in steam boilers:
Shell and Tube Heat Exchangers: These have a big shell with tubes inside. The hot gases go through the tubes, and the water goes around them, taking the heat.
Plate Heat Exchangers: Plate heat exchangers have a bunch of thin plates stacked together. Hot gases go on one side of the plates, and water goes on the other side. This makes the heat move.
Condensing Heat Exchangers: Condensing heat exchangers are made to get the most heat out of the steam. They do this by making the water in the hot gases turn back into water. This makes heat come out.
Steam Drum and Water Drum
In steam boilers, steam drum and water drum are important parts that help make steam. The steam drum collects and stores steam made by the boiler, and the water drum holds water that will be made into steam.
The steam drum is important because it separates steam from water. It also helps control pressure in the boiler. The water drum holds the water that will be heated and sent to the steam drum to be made into steam.
Taking care of the steam drum and water drum is important. They need to be taken care of so they don’t get rusty or dirty.
Economizer
Economizers are important boiler parts that help make boilers work better. They are heat exchangers that heat the water before it goes into the boiler using heat from the smoke.Economizers make it so that less energy is needed to turn water into steam, which saves fuel. They also help make less pollution and make the boiler work better for the environment.There are different kinds of economizers that people use, like:
Non-condensing Economizers: These economizers work at temperatures higher than when smoke becomes water, so they only get heat from the smoke that is heat you can feel.
Condensing Economizers: These economizers make the smoke colder than when it becomes water, so they can get heat from the smoke that is heat you can feel and heat you can’t feel.
Combustion Air Preheaters: These economizers heat the air that goes into the boiler, so the boiler uses less fuel.
Superheater
The superheater is an important part that makes steam hotter in a boiler. It helps make the steam work better for different things.
A superheater is a thing that makes steam hotter. It takes steam that is wet and makes it dry. Steam that is dry is used to make electricity in things like steam engines and steam turbines. It is also used for making things like hydrogen. There are three kinds of superheaters: radiant, convection, and separately fired. Superheaters can be small or big. They can be a few feet long or a few hundred feet long.
The superheater makes the steam hotter by giving it more heat. This makes the steam hotter than when it becomes water. When the steam is hotter, it is dry and has more power. The steam works better when it is hotter.
Sometimes, the superheater gets too hot or does not get enough heat. When this happens, someone has to fix it so it works right.
Regulators--Pressure and Temperature Sensor
Regulators in boilers are important parts that help control things like pressure and temperature. They make sure the boiler works good and is safe.
The pressure regulator controls the pressure of the steam that comes out of the boiler. It makes sure the pressure is not too high and does not break the boiler.
The temperature regulator looks at the temperature of the steam or water in the boiler. It makes sure the temperature is right so the boiler works good.
System of the Industrial Gas Fired Steam Boiler
It contains the combustion system, steam water system, and control system
Combustion system
The combustion system supplies fuel to the boiler for heat generation.
Gas/Oil fired steam boilers' combustion system is equipped with a burner and fuel device according to the fuel properties, steam capacity and pressure of the boiler.
Burner brands: Baltur, Riello, Weishaupt, Hofamat, Honeywell, Ecoflam, and so on.
Steam water system
The steam water system consists of a feedwater part and a steam part.
Feedwater part: Feedwater refers to the water that is provided to the boiler for steam conversion. The feedwater channels water into the boiler and automatically controls it to satisfy steam requirements.
Steam part: the steam is the part of the boiler responsible for collecting and regulating the steam generated by the boiler. Valves and pressure gauge controls are used to monitor and regulate steam pressure.
The steam and water system should be composed of boiler's main body, rear heating surface(such as economizer, condenser and so on which are equipped according to the actual situation of user), water treatment device, feedwater pump, steam header, deaerataor and so on.
Control system
The boiler control system is a collection of boiler electrical control components, a center for collecting and processing boiler operating signals, and an operation platform for sending execution instructions to each execution unit of the boiler.
Conclusion
The above is a comprehensive introduction to industrial gas steam boilers. If you are interested in this product and have the need to purchase it, please contact CN Boiler. We can provide high-quality products for your project.
