The non-pressure indirect heating hot water boiler body adopts a three-pass flue tube shell type wet back structure, that is, the furnace and the flue form the heating surface. The fuel burns at a slight positive pressure in the furnace, and the high-temperature flue gas enters the first flue tube bundle through the return combustion chamber along the furnace, and turns 180° into the second tube bundle through the pressure-type front smoke box, and then exhausts after the convection heat exchange. into the atmosphere.
We use the design idea of the centrally symmetric three-pass structure to design a three-pass furnace body with a larger capacity. The biggest features of this structure boiler are: the central symmetry of the drum, the full wet back type, and the large inner tank and firebox. The structure is beneficial to provide enough radiation heating surface. The convection heating surface is composed of tube bundles of the second return and the third return. The front tube plate of the return combustion chamber is connected with the furnace, and the second return and third return smoke transfer chamber constitutes the front smoke box, and the temperature of the smoke is lower than 500 ℃. The temperature of the flue gas in the rear smoke box is lower than 150 ℃ after the three-return flue pipe fully absorbs heat, and then it is discharged into the atmosphere.
The front and rear smoke boxes adopt a hinged light structure, which is convenient for opening and closing maintenance. There is a conjoined expansion water supply tank just above the furnace body, so there is no need to set up another water supply tank. The upper part of the built-in boiler is equipped with a tubular stainless steel water-water heat exchanger, which is used to heat the circulating water flowing through the heat exchanger. The external boiler is equipped with a tubular stainless steel water-water heat exchanger outside the furnace body, and the heat medium water in the furnace body is heated by a circulating pump and flows through the circulating water in the heat exchanger to achieve the function of outputting heat. This series of boilers has compact structure, convenient installation and transportation, equipped with high-quality burners and control systems, and intelligent automatic operation.
1. All the above values are based on the low calorific value of natural gas (LNG) 8,400kcal/Nm³, city gas (CG) low calorific value 4,000kcal/Nm³, coke oven gas low calorific value 4,200kcal/Nm³, diesel low calorific value 10,200kcal /kg, methanol low calorific value 4650kcal/kg is the standard calculation.
2. According to user needs, our company can provide other special types of boilers.