【Haichuan Equipment Guessing Game】Critical equipment in energy companies, prone to fires

In power plants, the desulfurization and denitration systems often experience fires in their internal rubber-lined equipment due to welding during construction.

Dust collector off. Why do fires occur so often? If the exhaust contains flammable gases, then why not make use of them?

Denitration should take place at the earlier stage, while desulfurization is done using a wet method

On that day, a fire broke out in the desulfurization tower at the Yellow River Tongli Cement Factory in Yiyang County, Henan Province. This is not an isolated incident; in the past two years, desulfurization towers have frequently caught fire: a desulfurization tower in Lanzhou, Gansu, caught fire, and the cause of the fire is under investigation ； Fire breaks out at a desulfurization tower under construction at a steel plant in Yuncheng, Shanxi, resulting in losses of over 10 million yuan ； Fire breaks out at the desulfurization tower of Zhicheng Chemical in Zhuzhou, Hunan; local air quality levels exceed limits temporarily ； A fire broke out in a desulfurization tower under construction at a thermal power plant in Linyi; the flames reached heights of over ten meters... According to incomplete statistics, there have been more than 40 incidents of fires in desulfurization towers since 2018, many of which occurred at thermal power plant desulfurization towers, serving as a warning sign regarding safety issues. Why do desulfurization towers catch fire so frequently? What is the “culprit” of the accident? How to prevent accidents?

Yes, the denitration process uses the ammonia method, while desulfurization generally employs lime water. In the photo, it’s just desulfurization. Many devices are equipped with denitration systems, such as cracking furnaces. But generally, only coal-fired chimneys are equipped with desulfurization.

Now, the flue gas is discharged directly into the atmosphere after passing through the desulfurization tower; there is no chimney anymore

After flue gas desulfurization, it is discharged directly through the chimney on the desulfurization tower; it’s just that the chimney has been changed from concrete to metal.

The path is different; in the original system, desulfurization took place through a bypass, and the desulfurized flue gas had to return to the chimney before being released. To increase the momentum of the flue gas, a heat exchanger GGH was used to exchange cold and hot flue gas