ZWNS type fuel gas vacuum hot water boiler

The lower half structure of a vacuum hot water boiler is the same as that of a regular boiler, consisting of a combustion chamber and heat transfer tubes; The lower part is equipped with a heat medium, and the upper part is a vacuum chamber, in which a U-shaped heat exchanger is inserted. Due to the overall negative pressure state of the boiler, it is absolutely safe. The heat medium inside the furnace does not enter, exit, increase, or decrease during the entire operation of the boiler. It is only enclosed in the vacuum chamber of the boiler and transfers heat between the heat transfer tubes and heat exchangers of the boiler. The heat medium inside the furnace is completely deoxygenated pure water, which is non corrosive and free of scale, making the boiler have a lifespan of more than 20 years; Its structure consists of high-quality 20 # boiler tubes arranged in a heat pipe bundle for combustion heating, hence it is called a tube flow heat pipe boiler. Its advantage is a large combustion chamber and low furnace pressure. The composition of the tube makes it have a large heating area, small volume, and light weight, only two-thirds of that of a shell boiler. And it has a small water capacity and a fast heating speed, reaching the ideal temperature in 5-8 minutes. In addition, a negative pressure evaporation chamber with a reasonable size connected in the upper part is designed, which has stable performance, reliable operation, and no problems of rapid rise and fall. Due to the large space of the negative pressure evaporation chamber, the inserted U-shaped heat exchanger can be manufactured according to the user's needs.

Adopting a three return wet back structure design, the unit undergoes insulation treatment before leaving the factory. If a condenser is added to the outlet of the flue, it greatly reduces the exhaust temperature and exhaust heat loss, making the thermal efficiency of the unit reach 94% -96%

The lower half structure of a vacuum hot water boiler is the same as that of a regular boiler, consisting of a combustion chamber and heat transfer tubes; The lower part is equipped with a heat medium, and the upper part is a vacuum chamber, in which a U-shaped heat exchanger is inserted. Due to the overall negative pressure state of the boiler, it is absolutely safe. The heat medium inside the furnace does not enter, exit, increase, or decrease during the entire operation of the boiler. It is only enclosed in the vacuum chamber of the boiler and transfers heat between the heat transfer tubes and heat exchangers of the boiler. The heat medium inside the furnace is completely deoxygenated pure water, which is non corrosive and free of scale, making the boiler have a lifespan of more than 20 years; Its structure consists of high-quality 20 # boiler tubes arranged in a heat pipe bundle for combustion heating, hence it is called a tube flow heat pipe boiler. Its advantage is a large combustion chamber and low furnace pressure. The composition of the tube makes it have a large heating area, small volume, and light weight, only two-thirds of that of a shell boiler. And it has a small water capacity and a fast heating speed, reaching the ideal temperature in 5-8 minutes. In addition, a negative pressure evaporation chamber with a reasonable size connected in the upper part is designed, which has stable performance, reliable operation, and no problems of rapid rise and fall. Due to the large space of the negative pressure evaporation chamber, the inserted U-shaped heat exchanger can be manufactured according to the user's needs.

working principle

Under standard conditions, the vacuum degree of the boiler is -76CMHG. After the boiler is started, the heat generated by fuel combustion is transferred to the heat medium water in the heating surface, causing the heat medium water to evaporate into steam under negative pressure in the furnace. These vapors rise and exchange heat with the heat exchanger in the vacuum chamber, becoming condensed water and flowing back into the furnace water. This process repeats, and the heat transfer process is achieved through the phase change of the furnace water. The condensation and vaporization of the furnace water transfer the latent heat of vaporization of the furnace water. At the same time, if there are special requirements for the working medium, usage differences, heating temperature, output flow rate, etc. inside the heat exchanger, special design can be carried out according to user needs, and quality and timely delivery can be guaranteed. For media with strong corrosiveness that are heated, the heat exchanger, flange, and water separator can be designed and manufactured entirely of stainless steel. For larger heating applications, multiple units can be operated in parallel, which is better than a single unit and has a better energy-saving effect. The whole machine runs, serving multiple purposes and meeting the needs of different occasions without the need for additional settings. During the operation of a vacuum hot water boiler, the internal pressure of the furnace body is always in a vacuum state of -15CMHG to 76CMHG. Even if the U-shaped heat exchanger leaks due to external pressure or fails to exceed the external atmospheric pressure due to operation, the controller, water temperature control, overheat switch, and vacuum pressure switch will automatically cut off the power supply. When the pressure reaches 0.025MPa, the pressure relief valve will automatically open to release the pressure. Due to the advanced technology used in the control of the Zhengyu vacuum boiler, all water level faults are automatically triggered with low sound alarms. The system can automatically cut off the power supply and inform users, avoiding losses caused by water shortage.

Due to its special design structure, it can be used for multiple purposes and provide multiple channels of hot water with different temperature differences, meeting the various needs of users for central air conditioning, heating, sanitary hot water, high-end swimming pools, hotels and other hot water supply. It can also provide process water for various industrial and mining enterprises. Due to its good insulation effect, imported burners are used, suitable for areas with an altitude of less than 3000 meters. For heating, it indirectly receives heat from the burner through negative pressure steam. The vacuum degree in the vacuum chamber of -76CMHG under standard conditions decreases as the vapor pressure inside the vacuum chamber increases; When the negative pressure steam temperature of the heat medium reaches 94 ℃ and the vacuum degree drops to -15CMHG, the vacuum switch is activated to stop the combustion operation; As the heat exchanger takes away heat, the temperature of the heat medium and its steam decreases, and the negative pressure increases accordingly. At any time, the vacuum switch starts the burner to cycle back and forth, achieving the purpose of supplying water and heating. The minimum vacuum degree in the vacuum chamber of the furnace is -15CMHG, and the maximum is -76CMHG. It always maintains a negative pressure state to ensure absolute safety. The temperature of the heat medium and steam in the vacuum chamber can be increased to 94 degrees Celsius, so the heating and heating water temperature can reach over 80 degrees Celsius. The boiler body and vacuum chamber do not bear any pressure, while the heat exchanger can withstand pressure. Therefore, the entire process from debugging to operation does not require inspection or certification as a boiler worker.