Gas boiler structure:

   Hebei Gas Boiler currently mainly hasWNSSeriesSZSSeries.WNSThe series of boilers is mainly composed of two major components: the drum and the firebox. It features a second and third return螺纹tubes heating surface design, also known as a horizontal three-return boiler. What is meant by that is...“Wet-back style” Boilers refer to the transition chamber of the boiler being incorporated into the drum, with the tube plate, back plate, and cylinder of the transition chamber all surrounded by boiler water.(Immersed in molten bath)Therefore, it is referred to as“Wet Back”(Also known as water-backed style)。
   CurrentlyWNSAll the series regenerative chambers are submerged in water, being wet-back boilers. The dry-back boilers' transition chamber is not fully immersed in water. Hezhou gas boilers utilize wet-back structures. Additionally, to ensure safe and economic operation of the boiler, accessories such as instruments, automatic control systems, and protection systems are also added.

    SZSThe series of boilers belong to the double-drum longitudinal chambered room combustion boilers. These boilers are of the upper and lower drum type with water-cooled walls. Between the drum and the lower header, there are downcomers and water-cooled wall tubes, forming the framework of the combustion chamber.

Boiler Classification

Steam Boiler

In the first half of the 18th century, steam engines used in British coal mines, including Watt's early steam engines, operated at steam pressures equal to atmospheric pressure. By the latter half of the 18th century, steam pressures exceeding atmospheric pressure were employed. In the 19th century, the common steam pressure reached approximately 0.8 MPa. Correspondingly, the earliest steam boiler was a large-diameter vertical cylindrical shell used for containing water, later replaced by a horizontal shell, with fires burning in a brick-lined furnace beneath it.

Twin-flue boiler

As boilers grew larger, to increase the heating surface, a fire tube was added to the boiler shell. Fire was burned at the front of the tube, with flue gases exiting from the back and passing through a brick-lined flue to the chimney, thereby heating the external surface of the boiler shell. This type of boiler is known as a fire tube boiler. Initially, only one fire tube was installed, referred to as a single fire tube boiler or Cornish boiler. Later, two fire tubes were added, known as a double fire tube boiler or Lancashire boiler.

Horizontal external reheat tube boiler

Around 1830, after mastering the production of high-quality steel pipes and expansion technology, fire-tube boilers emerged. Some fire tubes were installed inside the boiler shell, forming the main heating surface of the boiler, with the fire (flue gas) flowing through the tubes. A large number of fire tubes were installed below the water level line in the boiler shell, known as horizontal external fire-tube boilers. They have a lower metal consumption, but require substantial masonry.

Pot drum

In the mid-19th century, the water-tube boiler emerged. The heating surface was the water pipes outside the boiler shell, replacing the boiler shell itself and the fire-tubes inside. The increased heating surface area and steam pressure of the boiler were no longer limited by the diameter of the boiler shell, which was beneficial for enhancing the evaporation capacity and steam pressure of the boiler. The cylindrical boiler shell in this type of boiler was then renamed to a drum, or called a steam drum. Early water-tube boilers only used straight pipes, which limited both the pressure and capacity of the boilers.

In the early 20th century, steam turbines began to develop, requiring boilers with higher capacity and steam parameters. Straight-tube boilers could no longer meet the demands. With advancements in manufacturing processes and water treatment technology,弯水管式锅炉 emerged. Initially, multi-drum boilers were used. As water-cooled walls, superheaters, and economizers were adopted, and improvements were made to the steam-water separation elements within the drums, the number of drums gradually decreased, saving metal while also enhancing the boiler's pressure, temperature, capacity, and efficiency.

Safety

Gas boilers differ from other gas appliances due to their unique installation location, high gas consumption, and the higher safety requirements they entail. Therefore, in North America, all gas fireplace products must pass stringent safety and environmental protection standards before being launched into the market. These standards are continuously updated as products evolve. Each type of fireplace product has specific and precise safety testing standards. For instance, the testing standards for balanced gas fireplaces and flue gas fireplaces are different, as are those for decorative gas fireplaces and heating gas fireplaces. Consequently, North American balanced gas fireplace products should have certifications such as Ansi Z21.88 or CSA2.33, indicating that the product's safety and environmental protection meet the standards, and users can use them with confidence.

Auxiliary boiler

The earlier fire-tube boilers, water-tube boilers, and firebox boilers all belonged to natural circulation boilers. Due to the varying heating conditions in the ascending and descending pipes, density differences were created, leading to natural flow. While developing natural circulation boilers, the use of once-through boilers began in the 1930s, and auxiliary circulation boilers were introduced in the 1940s.

Forced-circulation boiler

The auxiliary circulating boiler, also known as a forced circulation boiler, is an evolution of the natural circulation boiler. A circulating pump is added to the downcomer system to enhance the water circulation of the evaporative heating surface. In a once-through boiler, there is no drum. Feedwater is supplied to the economizer by the feedwater pump, passes through the water wall and superheater, etc., to become superheated steam for the turbine, with all the flow resistances in the various sections being overcome by the feedwater pump.

Composite circulating boiler

After World War II, these two types of boilers experienced rapid development due to the demand for high-temperature, high-pressure, and large-capacity power generation units at the time. The aim of developing these boilers was to minimize or eliminate the need for drums, allowing for the use of small-diameter tubes as heating surfaces and providing greater flexibility in their arrangement. With advancements in automatic control and water treatment technologies, they have become increasingly mature. At supercritical pressures, once-through boilers are the only type that can be used. In the 1970s, the largest single unit capacity was a 27 MPa pressure with a 1300 MW power generation unit. Later, a hybrid once-through boiler was developed, combining features of auxiliary circulation and once-through boilers.

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