A steam generator, also called a steam heat source machine, is a mechanical device that uses heat from fuel combustion to convert water into steam. Its steam production process mainly includes water pretreatment, preheating, heating and steam generation, combustion system operation, steam-water separation, and energy-saving measures.
Water Pretreatment
Before the steam generator starts operating, the feed water is purified to remove impurities and minerals. This helps prevent scale formation during heating and protects steam quality. Proper pretreatment also reduces fouling in downstream piping and heat exchange surfaces.
Water Preheating
The purified water passes through a cooler, where heat radiated from the left combustion chamber and residual heat in the flue gas are used to preheat the incoming water. This shortens the time needed for cold water to reach operating temperature, lowers exhaust temperature, and improves overall energy efficiency.
Water Heating and Steam Generation
Preheated water enters the lower vessel and absorbs heat through finned tubes. The finned tube design increases the heat exchange area and improves heat transfer efficiency. Once the water inside the finned tubes absorbs enough heat, it vaporizes almost instantly into steam. Finned tubes, tube sheets, and internal baffles are key to stable heat exchange performance. Hansheng Automation can provide precision machining for these non-standard components based on customer-provided drawings, with attention to material selection, dimensional accuracy, and surface finish to suit specific operating conditions.
Combustion System Operation
The combustion system is divided into left and right sections. The right side houses the cooler, while the left side contains the combustion chamber. A surface metal fiber mesh burner rod is ignited by an automatic electronic ignition needle. Gas and air are fully premixed before entering the combustion chamber, allowing more complete combustion. The heat generated is transferred to the water inside the finned tubes, producing steam.
Steam-Water Separation and Output
The generated steam enters the once-through chamber at the top of the combustion chamber, where dry steam and wet steam are separated. Saturated steam is sent to the pipeline for use, while unevaporated water is returned through the once-through tubes to the lower vessel for reheating and recovery. This helps ensure steam quality and efficient energy use. Separation internals and return tube connections must be matched precisely to control water carryover. We can machine non-standard separation baffles, return fittings, and related parts according to customer drawings, supporting users in maintaining stable steam dryness.
Environmental and Energy-Saving Technology
The steam generator uses fully premixed surface combustion technology, which differs from traditional high-pressure jet gas burners. With diffusion combustion, fuel burns more completely and thermal efficiency is higher. In addition, the flame of the metal fiber burner is short and symmetrical, avoiding the local high-temperature zones typical of conventional jet burners, so NOx emissions remain very low.
Overall, the steam generation process depends on the coordinated operation of water treatment, heat exchange, combustion, and steam-water separation. During equipment maintenance, upgrading, or component replacement, non-standard parts are often needed to match existing systems. Hansheng Automation is able to support such needs with drawing-based precision machining, helping users maintain long-term operational reliability without changing the original equipment structure.
