Well-designed:

Horizontal inline three-return full wet-back engine design100%Wave furnace tube,Excellent thermal expansion properties. The water-enclosed fire overall design, with ample heating surface and rational structural arrangement, ensures the high-efficiency operation of the boiler. 

High-efficiency and energy-saving:

Steam and hot water boiler series all have high thermal efficiency.97%-99%With a large combustion chamber and reasonable structural arrangement, more heat can be transferred into the water, significantly enhancing the heat exchange capabilities between fuel and steam, as well as fuel and hot water. 

Meets environmental protection requirements:

The combustion chamber has ample space, maximizing radiant heat exchange, and is equipped with a high-quality and reliable imported burner, ensuring complete combustion of the fuel and significantly reducing harmful emissions in the flue gas. Our company's oil (gas) steam and hot water boilers meet national environmental protection requirements after being tested by authorized departments, making them ideal eco-friendly products. 

Superior configuration:

Complementing world-renowned burners, the advanced control system (with mainly imported components), valves, and pumps are all sourced from national high-quality products. The excellent boiler accessory configuration provides a robust guarantee for the safe and stable operation of the boiler. 

Fully automatic operation:

Users simply need to press the start button, and the boiler will operate according to the set program. Load regulation, water supply, and other functions are all fully automated, requiring no constant supervision. 

Easy maintenance and repair:

Boilers are equipped with movable ash box doors at both front and rear, featuring observation holes and inspection ports at the rear for easy access to the furnace chamber for inspection and cleaning. A manhole is provided on the boiler body, with a structural design that facilitates future maintenance and service.

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 above atmospheric pressure were employed. In the 19th century, the common steam pressure increased to about 0.8 MPa. Correspondingly, the earliest steam boiler was a large-diameter vertical cylindrical shell used for holding water, later replaced by horizontal shells, with fires burning in brick-lined bodies beneath the shells.

Twin-flue boiler

As boilers grew larger, to increase the heating surface, fire tubes were added to the boiler shell. Fire was burned at the front of the tubes, and the flue gases exited from the back, passing through brick-lined flues to the chimney and heating the exterior of the boiler shell, known as fire-tube boilers. 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 Combustion Reheat Tube Boiler

Around 1830, after mastering the production and expansion technology of high-quality steel pipes, 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 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 of the boiler was the water pipes outside the boiler shell, replacing the boiler shell itself and the fire tubes inside. The increase in the heating surface area and steam pressure of the boiler was 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 the drum, or commonly referred to as the steam drum. Early water-tube boilers only used straight pipes, and both the pressure and capacity of straight-pipe boilers were limited.

In the early 20th century, the development of steam turbines necessitated boilers with higher capacity and steam parameters. The straight-tube boilers were no longer sufficient. With advancements in manufacturing techniques and water treatment technology,弯水管式 boilers emerged. Initially, multi-drum boilers were used. As water-cooled walls, superheaters, and economizers were adopted, along with improvements in the steam-water separation elements inside the drums, the number of drums gradually decreased, saving metal and benefiting the increase in boiler pressure, temperature, capacity, and efficiency.

Safety

Gas boilers differ from other gas appliances in that they have a unique installation location, high gas consumption, and are safety-critical products. Therefore, in North America, all gas fireplace products must pass rigorous safety and environmental protection standards before being launched into the market. These standards are also continually updated as the products evolve. Different types of fireplace products have specific safety testing standards. For instance, the testing standards for balanced flue gas fireplaces and chimney gas fireplaces are different, as are those for decorative gas fireplaces and heating gas fireplaces. Consequently, North American balanced flue 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

Historically, fire-tube boilers, water-tube boilers, and firebox boilers were all types of natural circulation boilers. Due to varying heating conditions in the ascending and descending pipes, density differences were created, resulting in 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 developed based on the natural circulation boiler. A circulating pump is installed in the downcomer system to enhance the water circulation in the evaporative heating surface. In a once-through boiler, there is no drum; the feedwater is sent to the economizer by the feedwater pump, passes through the evaporative heating surfaces like the water-cooled wall and superheater, and then becomes superheated steam for the turbine. The entire flow resistance in all parts is overcome by the feedwater pump.

Composite recirculating boiler

Following World War II, these two types of boilers saw 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 more flexibility in arranging the heating surfaces. With advancements in automatic control and water treatment technologies, they gradually matured. At supercritical pressure, once-through boilers were the only type that could be used. In the 1970s, the largest single unit capacity was a 27 MPa pressure with a 1300 MW power generation unit. Subsequently, a combined cycle boiler was developed, which was a combination of auxiliary circulation and once-through boilers.

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