TSC-X dewatering bin

In a coal-fired power plant, the dewatering bin will dewater slag slurry from the bottom of the boiler and ash slurry behind the boiler to a moisture content of less than 30%, and then the dewatered slurry will be shipped out by trucks. Its principle and process is as below. The ash slurry is continuously injected into the bin near the center of the upper opening of the dewatering bin, and then the ash slowly settles down. The clear ash water on the upper part overflows from the serrated overflow weir around the upper opening of the dewatering bin, and then flows into the corresponding sedimentation tank and storage tank (or high-efficiency concentrator) for clarification step by step. The clarified water is still utilized for ash cooling and hydraulic handling to realize the recycling of ash-separating water. The concentrated slurry in the sedimentation tank and storage tank (or high-efficiency concentrator) is still pumped back to the dewatering bin (see the Typical Circulation System Diagram of the Dewatering Bin for details). After the ash level in the dewatering bin reaches the rated height, slurry injection will be stopped, and then static water filtration will be done for 4-8 hours to bring the moisture content of ash down below 25%. In the end, the bottom ash discharge gate will be activated to discharge the dewatered ash and ship it out. 

The ash slurry is injected into the buffer disc near the center of the upper opening of the bin. The center of the buffer disc is a buffer cup lined with cast stone and surrounded by a perforated disc. The ash slurry is buffered by the buffer cup first, and then diffused into the bin under the evacuation action of the perforated disc. As a result, the ash slurry in the torrent can be fully slowed down, which will be helpful for ash precipitation and the reduction of the ash content of the overflow water. The central water filtering device is composed of several sections of filter elements piled up and down, and the joints are not fastened with bolts, so that a dedicated anchor can be used to load and take out these sections one by one at the upper opening, and it is quite convenient to replace the filter elements. The plug-in mounting design also makes it very easy to replace the "triangular ridge"-type water filtering elements around and also replace the filter screen on the ash door. As a result of the chemical composition of ash, the fouling and blockage of the filter screen makes it quite frequent to replace filtering elements. However, it is very difficult to replace these elements in the original structure. Replacement-friendly filtering elements are a pressing need of power plants. 

In general, two dewatering bins constitute one set for alternate use. When one is working for static dewatering and discharging ash, the other is used to receive ash slurry. 

 

According to the diameter of the bin body, there are currently six specifications of dehydration bins. The main technical parameters are shown in the table below. According to different usage requirements of users, there are corresponding non-standard design products with different structural sizes.