Coal-fired hot-blast stoves used to be the main domestic heating and industrial production hot-blast stoves in China. The total amount of coal consumed annually by using coal-fired hot stoves is 600 million tons. According to incomplete statistics, the total number of industrial coal-fired hot blast stoves in China is 600,000. It can be seen that the proportion of coal-fired hot blast stoves in China's industrial life is large, covering a wide range. The thermal efficiency of these stoves is generally much lower than that of gas-fired stoves, but the pollutants discharged from these stoves are doubled. Therefore, it is imperative to transform coal-fired hot blast stove into gas-fired hot blast stove. From the central government to the local government, all levels of government organs are actively involved in the tide of gas hot stove transformation, in order to reduce pollution emissions, improve production efficiency to do their part.
What are the advantages of transforming a coal-fired hot stove into a gas-fired hot stove? Let me count the advantages of transforming a coal-fired hot stove with you.
1. Improvement of thermal efficiency of hot blast stove. Compared with coal-fired hot stove, gas-fired hot stove has one advantage, that is, the thermal efficiency of gas-fired hot stove is higher than that of general coal-fired hot stove. The improvement of thermal efficiency of hot blast stove can help enterprises improve work efficiency and reduce industrial costs.
2. Reduction of pollutant emission from hot blast stove. It is well known that the pollutants produced by natural gas combustion are much less than those produced by coal combustion. Natural gas combustion mainly produces water and carbon dioxide, which is convenient for waste gas treatment. The coal-fired hot blast stove needs a series of processes such as desulfurization and purification to discharge safely.
3. The government gives environmental protection subsidies or incentives. Enterprises renovate hot stoves and the government subsidizes them. It has become something that governments at all levels can do today. Government subsidies have reduced the cost of rebuilding hot stoves for enterprises, and the beneficiary enterprises are certainly willing to rebuild gas hot stoves.
4. The laying of natural gas pipeline facilitates the supply of raw materials. Major cities are now improving the laying of natural gas supply pipelines. The supply of natural gas will become the mainstream in the future. By contrast, coal is transported by car. Pipeline transportation of natural gas is safe, clean, environmentally friendly and efficient.
Notices for Converting Coal-fired Hot-blast Stove to Natural Gas
The combustion transformation of hot blast stove fuel is based on scientific basis and professional requirements. We can not rely on our imagination or bad businessmen for their own small profits, regardless of the unique structure and combustion mode of hot blast stove, blindly change, seal the original combustion chamber feeder, and insert the combustion chamber nozzle directly into the combustion chamber by opening an empty side, or even remove the flue gas to induce smoke. Machine, natural emission by flue gas.
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.
Coal-fired flame is flushed onto all hot stoves which are vertical structures. 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 causes inestimable direct and indirect losses to enterprises.
Whether converted to gas or fuel, the hot blast stove must follow the direction of the flame, that is, to change to a horizontal structure, in view of the horizontal direction of the 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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