Gas-fired vacuum boilers and coal-fired boilers have very obvious advantages:
1. Because the ash, sulfur, and nitrogen in fuel gas are all lower than those in coal, the amount of dust in the flue gas generated after incineration is very small, and the flue gas emitted is easier to reach the country's demand for incinerators standard. The use of gas boilers can greatly reduce environmental pollution.
2. The furnace volumetric heat intensity of the gas-fired vacuum boiler is relatively high; because the flue gas pollution is small, the convection control is free from corrosion and slagging, and the heat transfer effect is good. The smoke temperature is low, so that its thermal power has a significant increase.
Compared with these advantages, work and life are the most important issues, so pay attention to the following points to be more effective in work and life.
1. Affected by non-central loads
During the operation of a gas-fired steam boiler, the valve must periodically discharge overpressure steam. After the steam is exhausted, the valve stem is easy to deviate, causing the valve to leak air and the spring is eccentric under the non-central load, which reduces the stress value of the circular spring. That is, the stress is inversely proportional to the load eccentricity, which makes the valve spring ineffective and shortens the service life
2. Axial or radial load
Most valve springs used on boilers are cylindrical. According to calculations, when the valve spring is subjected to axial or radial load, the deformation and shear stress are inversely proportional to the diameter of the spring wire; when the spring is corroded in use, the diameter of the spring wire becomes smaller and the spring deforms The amount and shear stress increase, resulting in spring failure.
3. Affected by impact load
During the operation of the boiler, the valve is in a state of frequent beating, and a large impact speed is generated when exhausting. At this time, the first three turns of the spring first bear the impact load and absorb more impact energy. Because the impact load can not be quickly and effectively transmitted to the spring ring behind. Lead to plastic deformation and failure of the first three circles.
In order to ensure the performance of the gas-fired steam boiler, it is necessary to install a valve for the boiler. This is a very important protection valve, and its normal operation can avoid major accidents in the boiler.
