Boiler Categories

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 used. 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 for containing water, which was later replaced by a horizontal shell, with a brick-lined furnace burning beneath it.

Double-flue boiler

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

Horizontal External Combustion Reheat Pipe Boiler

Around 1830, after mastering the production and expansion techniques of high-quality steel pipes, fire-tube boilers emerged. Some fire tubes were installed inside the boiler shell, forming the main heating surface, 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 combustion return flue-tube boilers. They have a lower metal consumption but require a significant amount of masonry.

Dish pot

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 such boilers was then renamed to the drum or steam drum. Early water-tube boilers only used straight pipes, and the pressure and capacity of these straight-pipe boilers were both limited.

In the early 20th century, the development of steam turbines necessitated larger boilers with higher capacity and steam parameters. The straight tube boilers were no longer sufficient. With advancements in manufacturing techniques and water treatment, curved tube boilers emerged. Initially, multi-drum designs were used. As water-cooled walls, superheaters, and economizers were adopted, and improvements were made to the steam-water separation elements inside the drums, the number of drums decreased, saving metal and also benefiting the boiler's pressure, temperature, capacity, and efficiency.

Safety

Gas boilers differ from other gas appliances in that they require a special installation location, consume a large amount of gas, and are products with high safety requirements. Therefore, in North America, all gas fireplace products must pass strict safety and environmental protection standards before being launched into the market. These standards are also continuously updated with the development of the products. Each type of fireplace product has corresponding specific safety testing standards. For example, the testing standards for balanced gas fireplaces and flue gas fireplaces are different, as are the standards 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

Previous fire tube boilers, water tube boilers, and firebox boilers were all natural circulation boilers. Due to varying heat conditions in the rising and falling tubes, 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 started to be applied in the 1940s.

Forced-circulation boiler

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

Composite circulating boiler

After World War II, both 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 goal of developing these boilers was to minimize or eliminate the need for drums, allowing the use of small-diameter tubes as the heating surface, thus enabling more flexible arrangement of the heating surface. With advancements in automatic control and water treatment technologies, they gradually matured. At supercritical pressures, once-through boilers were the only feasible type. In the 1970s, the largest single unit capacity was a 27 MPa pressure with a 1300 MW power generation unit. Later, a composite cycle boiler was developed, which combined an auxiliary circulation boiler and a once-through boiler.

Environmental Gas Boiler Series, Direct Manufacturer of Natural Gas Steam Boilers

Fuel Gas Boiler, Manufacturer Direct, Lifetime Warranty Included

Heze Boiler FactoryLimited Company is a professional manufacturer specializing in gas boilers and oil-fired boilers.Biomass boilers, Liquefied Natural Gas (LNG) tanks, Liquefied Petroleum Gas (LPG) tanks, etc.No Chinese content provided.GroupCompany, located inBeautiful Chinese City of Peonies -- Heze, ShandongAdvanced technology and excellent service!

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