Coal-fired boilers use natural gas
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What are the dangers of using natural gas as fuel for coal-fired boilers?
I think there shouldn't be much harm, but the scope of the coal-fired boiler mentioned by the poster is too large. Moreover, the properties of the two fuels and the structure of the boiler are very different. It can't be changed by just changing it, right?
The structures of coal-fired boilers and gas-fired boilers are very different and cannot be changed at will. The consequence of this is that the failure rate of the boiler increases. The annual maintenance cost for the two 8t boilers in my unit is as high as 100,000 yuan.
I think the burner must be changed, and the heating surface of the water-cooled wall does not necessarily need to be changed. The coal-fired furnace must be larger than the gas-fired furnace to ensure that the smoke temperature at the furnace outlet cannot be too low (about 1000°). If it is too low, the temperature difference on the heating surface will become smaller and the heat transfer amount will become smaller.
The burner has been changed. However, the structures of the furnaces of coal-fired boilers and gas-fired boilers (gas-fired boilers are called combustion chambers) are different. On the other hand, the combustion value of natural gas is higher than that of coal. When coal is replaced by gas, only the burner is changed, but the furnace structure remains unchanged, which causes greater damage to the furnace and drum. Local overheating will occur, resulting in uneven heating of the drum.
There is not much harm in natural gas ginseng burning because natural gas is available in the area and must be sourced locally. The design of the boiler plant is also very important.
:) The gas used in our company is coke oven gas and blast furnace gas. If the gas does not leak, there will be no great harm. We have a gas leak alarm that will alarm when the gas reaches a certain concentration o(∩_∩)o...
Hello, thank you very much for your opinion. I thought that the combustion system structures of coal-fired boilers and gas-fired boilers are different. Coal-fired boilers only use natural gas as fuel after replacing the burner. This is not allowed in terms of protecting the safe operation of the equipment because it will cause local overheating of the drum and damage the pressure-bearing components. Of course, this situation does not exist for gas boilers. As long as the boiler safety accessories are complete and effective, various interlocking protection devices are complete and effective, the operators have corresponding qualifications and operate in strict accordance with the regulations, a combustible gas leak detector is installed in the workplace, and the management of outsiders is strengthened, there will be no accidents.
For coal-fired boilers to use natural gas, the boiler must first be modified. A suitable location must be selected to install natural gas nozzles, explosion-proof doors and alarms, gas pipelines, and many other things must be installed. If the boiler body is used, a manufacturing unit with modification qualifications must be selected.
We have done all the things mentioned by my friends, and of course we have hired qualified construction units to do it. Because we are engaged in oil extraction, the main starting point for using associated gas (the main component is natural gas) as fuel is to save coal. In fact, since natural gas is used as fuel, the boiler has to be overhauled every day (not the pressure-bearing components such as the drum). However, I have not carefully calculated whether it is cost-effective.
The furnace types are different. Mixed burning of gas is prone to coking, while single burning is prone to overheating and screen overheating.
Our company has just renovated this type of project for Shanxi customers. The difference is that: They burned coal bed methane instead. Project ing... transformation purpose: The furnace efficiency is greater than 90%, and the body modification is small. If you are interested in this, please pay attention to our latest updates.
Because oil-gas stoves use positive-pressure combustion, they have very high requirements for the sealing of the furnace. Otherwise, the flame will leak out and cause safety hazards! Generally, the furnace walls of oil and gas furnaces are membrane walls. If you want to retrofit them, it is recommended that you work on the furnace walls! In addition, adding an explosion-proof door is essential!