Huadian Qingdao's ultra-low emission transformation has four consecutive cards for flue gas control

The flue gas emitted by the four boilers must be “disinfected” first, then the seawater bath must be washed, and the body must be washed with fresh water. In the end, only 0.01% of the flue gas can “escape”. Yesterday, the reporter learned from Huadian Qingdao Power Co., Ltd. that they invested 160 million yuan this year to implement ultra-low emission retrofits, which will be completed next month, thus completing the environmental protection retrofit goal one year ahead of schedule.

The reporter visited the site of the renovation project and saw that the four boilers were about 70 meters high and 30 meters wide, equivalent to a 20-story building with two 225-meter chimneys nearby. Luo Jingsheng, deputy director of the company’s environmental protection center, introduced to reporters that the main pollutants in the flue gas produced by Huadian’s coal-fired boilers are sulfur dioxide and soot. Before being discharged into the atmosphere through the towering chimney, it must undergo denitrification, desulfurization and desulfurization. Dust removal treatment to intercept smoke, dust and sulfur dioxide. The easternmost building of the boiler is a denitration reactor. This renovation adds a layer of catalyst and sonic soot blowing, as well as ammonia tanks, evaporators, buffer tanks, and ammonia supply pipelines. "The original denitrification equipment had two layers of catalysts, but now it has become a three-layer catalyst. With the help of the catalyst, harmful nitrogen oxides become harmless nitrogen and moisture, which is equivalent to disinfecting flue gas." Luo Jingsheng used an analogy. Say.

The equipment further to the east is the electric bag filter. Each group of equipment has 6240 large cloth bags up to 5 meters high, which can wrap the flue gas. When the flue gas wants to rush out of the bag, some of the dust will be trapped. under. The equipment next to it is a limestone desulfurization system, where 60%-70% of sulfur dioxide in the flue gas can be removed. Then there is a seawater desulphurization system. The 7,900 tons of seawater drawn from Jiaozhou Bay is sprayed down the small holes and reacts with the sulfur dioxide in the smoke like a "shower". The filtered seawater flows along the underground duct. Flow out of the desulfurization tower.

At the end is a wet dust collector. This group of equipment uses the principle of static electricity to charge the dust in an electric field, and then absorbs the dust on the anode plate, and then uses industrial water to wash the anode plate. "This is like rushing the body to the smoke and dust, which can avoid secondary pollution and dust. It can not only purify the smoke, but also has a good removal ability for PM2.5, sulfur trioxide, and aerosols." Luo Jingsheng told reporters, After these four levels of treatment, the dust removal efficiency in the flue gas is increased from 99.95% to 99.99%.

There are 6 storage warehouses in the power plant for storing soot. The soot after the fourth-stage treatment will also turn waste into treasure. The hundreds of thousands of tons of soot produced by the power plant every year will be snapped up to produce cement, bricks, etc. material.