Case Overview
Yuanda SZS series gas hot water boiler for central heating. Thermal capacity is 28mw, working pressure 1.6mpa, hot water generating at 115°C, recturn water temperature 70°C.
This project is located in Xinjiang Province, China, where the climate is characterized by long and cold winters with large temperature differences, putting forward high requirements for the stability, efficiency and environmental protection of central heating equipment. To meet the heating needs of residential areas, public facilities and industrial supporting areas in the region, the project adopted 2 sets of 40Ton 28MW industrial natural gas hot water boilers of Yuanda SZS series, with the product model SZS28-115/70/1.6-Q. The core application scenario is central heating, which provides stable and continuous hot water supply for the heating station, effectively solving the problem of winter heating in the region and ensuring the comfort of residents’ life and the normal operation of related facilities.
Core Advantages
The 28MW natural gas-fired water tube hot water boiler of Yuanda SZS series adopted in this project has obvious comprehensive advantages, which can perfectly adapt to the special heating needs of Xinjiang region and the operation requirements of the heating station:
Working Principle
The 28MW natural gas-fired water tube hot water boiler of Yuanda SZS series adopts the vertical “D” type layout structure of double drum, with the furnace on the right and the convective tube bundle on the left. The working principle is based on the heat transfer of water tube, and the whole process is safe, efficient and controllable:
1) Boiler Working Principle & Heating Process
First, natural gas is transported to the full-premixed low-nitrogen burner through the gas pipeline, and is fully mixed with air before entering the furnace for combustion. The large furnace design ensures that the fuel is fully burned, and a large amount of heat is released during the combustion process. The heat is transferred to the water in the membrane water-cooled wall around the furnace, so that the water temperature gradually rises. Then, the hot water after heating enters the convective heating surface for further heat exchange, so that the water temperature reaches the set standard of 115°C. The hot water that meets the requirements is transported to the heating pipe network of the heating station, and then supplied to each heating terminal to realize central heating.
2) Hot Water Circulation & Flue Gas Waste Heat Recovery
After the hot water releases heat at the terminal, the temperature drops to 70°C and flows back to the boiler through the return water pipeline. After being heated again by the boiler, it enters the next cycle, forming a continuous and stable hot water circulation system. The boiler is equipped with an energy saver and a condenser, which can fully recover the latent heat of flue gas, further improve the thermal efficiency, and the flue gas after heat exchange is discharged into the atmosphere through the flue after reaching the standard.
Technical Characteristics
Project Operation Effect
Successful Application of Natural Gas Boiler Project
- Two sets of 28MW natural gas hot water boilers have been put into stable operation.
- The unit operates reliably with stable water temperature and pressure, fully meeting local heating needs.
- It achieves over 98% thermal efficiency, NOₓ emission below 30mg/m³, and 15%-20% lower operating cost.
- The project ensures clean heating and greatly improves local air quality and living comfort.
- Highly praised by the client, it serves as a typical model for cold-region heating projects.
