Coal-fired hot-blast stoves used to be the mainstream in China's hot-blast stove industry, but with the development and environmental protection of the cause of the importance of coal-fired hot-blast stoves gradually introduced. It is replaced by a natural gas hot-blast stove using natural gas as fuel. It should be considered a very environmentally friendly fuel because natural gas burns only to produce water and carbon dioxide. After the promotion of natural gas hot blast stoves, some manufacturers will change the former coal-fired hot blast stoves to natural gas, but at this time we need to pay close attention, otherwise accidents will occur easily. Next, Hua Shuai will tell you what matters needing attention in the conversion of coal-fired hot stove to natural gas hot stove.
The combustion transformation of hot blast stove fuel is based on scientific basis and professional requirements. We can't use our imagination or bad businessmen to make small profits without considering the unique structure and combustion mode of hot blast stove, blindly and indiscriminately alter the original combustion chamber feeding port, and directly insert the combustion chamber nozzle into the combustion chamber by opening an empty side. Some of them even remove smoke and smoke blower, and smoke naturally.
It seems that it can be used for combustion in a short time, but there are many hidden dangers. One is that the heating time is long and the fuel is wasted; the other is that the flue gas is irrational, which leads to the damage of heat exchanger in a short time.
The flame of coal is rushing up, so the hot stove is a vertical structure. The flame sprayed by the burner moves horizontally. It can be imagined that when the flame sprays into the combustion chamber to the opposite refractory material, it naturally goes up along the wall to the heat transfer zone of the hot blast stove, then a vicious circle of excessive local long-term temperature, excessive heating pressure and insufficient heat transfer effect of the flame at the other end will occur. If the heat transfer effect is poor and the temperature does not go up, the fuel consumption will be increased, and a vicious cycle will be formed until the furnace body is burnt out and scrapped. It can cause incalculable direct and indirect losses to enterprises.
Whether converted to gas or oil-fired hot stove, the hot stove must follow the direction of flame, that is to say, to change to horizontal structure, in view of the horizontal direction of flame. In order to reduce the scouring of high temperature areas such as hanging galls in the furnace body by high temperature flame, the combustion chamber matched by the burner must be a special structure, which is suitable for this combustion mode. According to the requirements, electronic control can be designed to be a fully automatic one-key operation, automatic ignition, automatic temperature control and automatic regulation of operating conditions. It not only achieves the advantages of energy saving, consumption reduction, convenient operation and labor saving, but also greatly shortens the heating time, reduces energy consumption and prolongs the service life of hot blast stove.
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