1、 Overview:
The function of a high-pressure heater is to use steam turbine extraction to heat boiler feedwater, in order to improve the thermal efficiency of the unit. The device consists of two main parts: a shell and a piping system. A steam condenser is installed at the upper part of the inner cavity of the shell
2、 Design and structural characteristics of high-pressure heater:

Our company's high-pressure heater products have two main types of internal heating tubes: disc-shaped tubes and U-shaped tubes. Our company has strict requirements for the manufacturing process of high-pressure heaters. We have a complete quality assurance control system and strict process control requirements for the materials, inspection, testing, and process methods used to ensure the reliability of our products.
High pressure heaters have the following characteristics:
1. The temperature difference stress is small.  
Overheating adopts counterflow heat transfer, that is, a junction section, with a hydrophobic cooling section at the bottom, and a water inlet and outlet at the top of the inlet and outlet pipes. When the superheated steam enters the shell through the inlet, it can heat the feedwater in the upper main screw tube. After the steam condenses into water, the condensed hot water can also heat part of the feedwater in the lower cooling screw tube. The utilized condensed water is drained out of the body through the drainage outlet. This device has significant advantages such as low energy consumption, compact structure, small footprint, and low material consumption. It can also strictly control the drainage water level, drainage flow rate, and reduce the drainage end difference. Reduced the temperature difference stress between the tube sheet and eliminated stress corrosion at the connection between the tube and the tube sheet.

2. Good heat transfer effect and large heat transfer area margin.  
Adopting advanced design methods, selecting the optimal steam water flow rate, good heat transfer, and low steam resistance. Under the same parameter conditions, our company has a larger heat transfer area margin (about 5-10%) compared to heaters designed in the same industry both domestically and internationally, ensuring good adaptability to water temperature rise under different operating conditions.
3. The anti-collision device adopts stainless steel baffle.  
4. The control system is equipped with anti vibration measures.  
5. Reliable strength. Based on pressure analysis, the design of the tube plate ensures reasonable pressure distribution and uniform force distribution in the tube system, resulting in high reliability of the high-pressure heater under operating conditions.
6. The expansion and welding quality of pipes and tube sheets is stable and efficient. Hydraulic expansion is used for expansion, and automatic tube sheet welding machine is used for welding.  
7. Weld the tube plate.  
8. A stainless steel rectifier plate is installed at the end of the heat exchange tube at the inlet of the water supply to reduce erosion.  
The coil box structure high-pressure heater adopts a collection and distribution system with five pipe openings welded to the box. The steam side is divided into three parts: superheated steam cooling section, condensation section, and drain cooling section by partition and inner cylinder structure. The welding position between the coil and the header is set on the outside, which makes it easy to replace the burst heat transfer tube and maintain a stable heat transfer area of the high-pressure heater during long-term operation.  
Advantages of coil high-pressure heater:
1. Easy to replace heat transfer tubes after damage;  
2. Without the need for a high-pressure water chamber and tube plate, it can withstand significant temperature changes;  
3. No tube plate, minimal impact of temperature difference stress, and less prone to leakage during operation;  
4. The heat transfer tube is welded onto the header, resulting in less stress concentration;  
5. It is convenient to set up a hydrophobic cooling section.  
3、 High pressure heater product specifications and models:

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