Heater for the heating network

There are two types of district‑heating feedwater heaters: the basic district‑heating heater and the peak‑load district‑heating heater. These heaters are used in power plants to heat the water supplied to the district heating network. The heating steam is either extracted from a higher‑pressure turbine stage or generated by superheated steam drawn from the boiler, which is then desuperheated and depressurized before being used as the steam source to raise the district‑heating water to the required supply temperature.

The primary district‑heating heater operates continuously throughout the heating season and can meet the vast majority of water‑temperature requirements during that period. During the coldest days of winter, when higher supply‑water temperatures are needed, the water exiting the primary heater is routed to a second heater connected in series, known as the peak‑load district‑heating heater.

High-pressure heater

Product Type: Horizontal, Vertical

Heat exchanger tube type and material: U‑bend carbon steel tubes, stainless steel tubes, alloy tubes.

Water chamber structural configuration: large opening self-sealing, hemispherical shape plus small opening self-sealing.

Shell-side configuration: single-section (condensation section), two-section (superheated steam cooling section and condensation section), three-section (superheated steam cooling section, condensation section, and condensate cooling section).

Key technologies: The heat exchange tubes are joined to the tube sheet by strength welding combined with hydraulic expansion; the water inlet of the heat exchanger is equipped with a flow‑distribution plate and stainless‑steel wear‑resistant sleeves.

Low-pressure heater

Product Type: Horizontal, Vertical

Heat exchanger tube types and materials: U‑bend stainless steel tubes, copper tubes, carbon steel tubes.

Water chamber configuration: cylindrical short section with elliptical end caps.

Connection method between the water chamber and the shell: flanged and bolted connection, or all-welded type.

Shell-side configuration: single-section (condensation section), two-section (superheated steam cooling section and condensation section), three-section (superheated steam cooling section, condensation section, and condensate cooling section)

Pressure vessel (yālì ró ng qì), English: pressure vessel refers to a closed device that contains gas or liquid and carries a certain pressure. In order to implement scientific management and safety inspection more effectively, pressure vessels are divided into three categories according to working pressure, medium harmfulness and its role in production in China's Pressure Vessel Safety Supervision Regulations. And for each category of pressure vessels in the design, manufacturing process, as well as inspection items, content and methods to make different provisions. Pressure vessels have implemented the safety and quality licensing system for imported goods, and goods that have not obtained the import safety and quality license are not allowed to be imported. According to the latest TSG21-2016 "Safety and Technical Supervision Regulations for Fixed Pressure Vessels", it should be divided into the first group of media and the second group of media according to the media, and then classified into categories I, II and III according to the pressure and volume. The so-called first, second and third categories of the old capacity regulations are no longer applicable. A pressure vessel is a closed container that can withstand pressure. The use of pressure vessels is extremely wide, it has an important position and role in many sectors such as industry, civil, military and many other fields of scientific research. Among them, the pressure vessels used in the chemical industry and petrochemical industry are the most, and the pressure vessels used in the petrochemical industry alone account for about 50% of the total number of pressure vessels. Pressure vessels are mainly used for heat transfer, mass transfer, reaction and other technological processes in the chemical and petrochemical fields, as well as storage and transportation of pressurized gases or liquefied gases; they are also widely used in other industrial and civil fields, such as air compressors. All kinds of special compressors and auxiliary machines of refrigeration compressors (coolers, buffers, oil-water separators, gas storage tanks, evaporators, liquid coolant storage tanks, etc.) are pressure vessels.