Flue Gas Desulphurization (BGD) Unit
A BGD unit based on the wet limestone process is planned to be installed in the power plant to bring the SO2 emissions that may occur as a result of coal combustion in the power plant below the limit values.
The BGD plant based on wet limestone process, is comprised f the following sections:
- Scrubber tower (absorber),
- Limestone storage system,
- Limestone solution preparation system,
- The gypsum dewatering system,
- The gypsum storage system and
- Wastewater treatment facility.
Limestone taken from the storage system, which has a storage capacity of approximately seven days, is sent to the limestone solution preparation unit. In the limestone solution preparation unit, the limestone solution to be prepared with the desired properties through wet mills and hydrocyclones, will be stored in the solution tank. This tank will be connected to the scrubber tower with the help of pipe and pump system and will ensure that the correct mixture amounts are reached for SO2 removal. A typical BGD scrubber tower includes a collection chamber and a reaction zone consisting of spray systems at various levels. The solution in the scrubber tower collection chamber will be sprayed through spray nozzles at various levels in the reaction zone by recycling pumps, and in the reaction zone, SO2 will react with the solution and be removed from the flue gas. As a result of the oxidation, gypsum will be formed and this product will be sent to the gypsum dewatering system.
The gypsum dewatering unit generally consists of hydrocyclones and a vacuum belt filter. While the water emerging from the hydrocyclone system is sent back to the scrubber tower, the more dense gypsum water will be sent to the vacuum belt filter to be completely removed. At the end of the dewatering process, the moisture content of the gypsum will be approximately 10%. The resulting gypsum is planned to be used in cement and plaster facilities to be repurposed in the economy.