Shandong Zhilin Environmental Protection Technology Co., Ltd.

Below is an explanation of the characteristics of the heating network heater

Release time:

2021-10-14 13:08

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Below is an explanation of the characteristics of hot water heaters for heating networks. Hot water heater systems play a significant role in the chemical and thermal power plant industries, and are becoming increasingly well-known. This equipment is receiving more attention from manufacturers and users. A hot water heater system is a pressure vessel mainly composed of a shell, tube sheet, heat exchange tubes, and end caps. It utilizes steam extracted from a steam turbine or from a boiler (heating medium) to heat the circulating water within the hot water supply system, meeting the requirements of heating users.

　　Heating network heater systems play a significant role in chemical and thermal power plants, becoming increasingly well-known and attracting attention from more manufacturers and users. This equipment is a pressure vessel, mainly composed of a shell, tube sheet, heat exchange tubes, and end caps. It uses steam extracted from a steam turbine or boiler (heating medium) to heat the circulating water in the hot water supply system, meeting the requirements of heating users.

Heating Network Heater

　　The heating network heater has a reasonable structure, complete models, and convenient selection. It can also be specially designed according to actual conditions. The three-dimensional spiral and three-dimensional guide rail adopt three-dimensional spiral micro-body heat exchange tubes. The inner and outer walls of these tubes are spiral corrugated. When the fluid flows, the part away from the tube wall maintains its original flow state, while the part close to the tube wall exhibits a spiral motion with constantly changing speed and magnitude. This spiral motion fluid simultaneously changes the flow state of the fluid away from the original tube wall. The two interact to form a complex three-dimensional flow with instantaneously changing speed, magnitude, and direction inside and outside the tube.

　　This heating network heater system can be widely used in heating, heating network peak regulation, production, and life systems, suitable for different heat exchange situations such as steam-water and water-water.

　　Heating network heater systems are divided into two types: basic heating network heaters and peak heating network heaters. The basic heating network heater operates continuously during the heating period, meeting the requirements for hot water temperature of most users during most of the heating period by bearing the basic heat load. During the cold winter period, a peak heating network heater is connected in series with the basic heating network heater to increase the temperature of the heating hot water to meet the user's requirements for higher water temperature.

　　The heating network heater is a low-pressure condensing heat exchange equipment

　　The heating network heater is a low-pressure condensing heat exchange equipment, equivalent to a condenser; therefore, it needs to be close to the condenser structurally.

　　Sufficiently large steam passages: including the steam inlet and the passages entering the tube system, require sufficiently large steam passages. Otherwise, the steam flow rate will be too high, causing impact on the heat transfer tubes, and increasing the flow resistance of the steam. When the flow resistance increases, the steam pressure in the heater decreases, and the outlet temperature of the water supply decreases. For example, large heating network heaters such as JR-1250 and JR-2600 have large steam passage areas, i.e., large steam passages between the shell and the tube bundle and between the tube bundles. The steam passage of the equivalent cold source is large in both volume and weight, but the operation is stable.

　　The tube bundle needs to be reasonably supported: In addition to installing baffles for support in the straight tube section, the U-shaped tube structure also needs to install vertical support devices at the bent tube ends to prevent vibration. Vibration verification calculations are required to prevent vibration. The theories for judging damage caused by heater vibration include the resonance theory, strength theory, and energy theory (or damping theory). Three methods derived from these three theories are used for verification calculation. All three must be satisfied. The calculation of the Swiss BBC company only uses the third method. This method sometimes cannot guarantee that the tube bundle will not vibrate. The volume of the flowing water should meet certain storage requirements. Based on the operating experience of heating network heaters in previous power plants, a volume storing 2-3 minutes of flow should be set. Otherwise, the operation of the drainage system will become unstable. Therefore, the original design had a small flowing water volume, resulting in an unstable drainage system. It was subsequently increased, and the drainage volume was also increased in the second-phase equipment imported from Switzerland, along with the structure of the drainage well.

　　Heat transfer tube type: The U-shaped pipe heat exchanger compensates well for thermal expansion and does not require thermal expansion verification, but it is inconvenient to tighten the pipes for cleaning or decontamination, and the pipes cannot be replaced. The straight pipe type facilitates cleaning and decontamination of the tube bundle, and any pipe can be replaced arbitrarily, but it does not have thermal expansion compensation capability and needs to install expansion devices on the shell and perform thermal expansion verification calculations.

　　That's all for the introduction of the heating network heater. I wish you a pleasant life!

Below is an introduction to the composition and working principle of the heating network heater

Let me explain the characteristics of the heating network heater.