The industrial hot water boiler refers to a kind of thermal equipment in which the phase change occurs inside the boiler body, that is, steam is not generated, and the return water is sent to the boiler and the flue gas is absorbed by the heated surface, and is not output to the saturation temperature. According to the hot water supply temperature, the hot water boiler can be divided into low temperature and high temperature hot water boilers. Hot water boiler has the advantages of low heat loss, wide heating range and low maintenance range, it has been accepted by the majority of users. According to relevant statistics, hot water boiler heating can save about 10% of fuel compared with steam boilers.
China's industrial hot water boiler fuel is mainly natural gas, with a large area, small average capacity, and low actual operating efficiency is a problem that everyone has been paying attention to. Now through the technical transformation of condensate recovery, increasing the air temperature in the furnace and installing a full premixed combustion device, the maximum energy saving and emission reduction effect is achieved. The reasons for the low operating efficiency of industrial hot water boilers in China are quite complicated. In summary, there are mainly several aspects: First, the reasons for design and manufacture, the design of the pressure components is more important than the combustion device. The second is the reason for the use of the boiler, the user does not match the actual capacity used when selecting the boiler. Third, the fuel does not match the design coal type of the boiler. The calorific value and combustion index of the combustion gas do not meet the boiler design requirements. Fourth, the relevant systems such as boiler energy conservation supervision are not perfect, and the technical standards are relatively lagging behind. According to relevant data, industrial hot water boilers are the largest gas users in a country and are one of the most energy-intensive devices. At the same time, because the boiler operation efficiency is not high, energy waste is quite serious, so the energy saving potential is huge. In addition, industrial boilers have become a major source of atmospheric pollution in China due to the emission of large amounts of SO2 and NO pollutants. Therefore, energy-saving renovation of industrial hot water boilers is of great significance for realizing the overall goal of energy saving and emission reduction .
The energy-saving transformation of industrial boilers can be made in two aspects: First, technological transformation. In the future, some old-style coal-fired boilers with low efficiency and serious environmental pollution will be eliminated, and the existing coal-fired boilers will be technically modified according to local conditions. The second is to use clean combustion technology to replace raw coal with clean energy to improve combustion quality.
The energy-saving transformation of industrial hot water boilers, we have made a lot of efforts, using advanced condensing combustion technology, with the advantages of fast burning speed, sufficient combustion, low heat loss of flue gas, etc., can be widely applied to industrial hot water boilers. The use of fully enclosed air supply, air supply and ash discharge technology, good thermal insulation performance, greatly reducing the heat loss caused by hot air and smoke leakage, and is beneficial to improve the thermal efficiency of the boiler.
It is said that industrial hot water boilers are gradually developing towards condensation technology. With the changes in the energy supply structure and increasingly strict requirements for energy conservation and environmental protection, efficient, energy-saving and low-pollution industrial hot water boilers using clean fuels and clean combustion technologies will be the trend of product development. At present, it is still necessary to vigorously develop integrated technologies for efficient combustion and flue gas dedusting and desulfurization, improve combustion quality, and solve the problem of boiler combustion and pollution in the whole process.