Heat exchanger useful in district heating power station to exchange heat between a hot exhaust gas flow and a cooling medium, comprises a first pipe for flowing the hot exhaust gas flow, and a second pipe for flowing the cooling medium

摘要

The heat exchanger useful in district heating power station to exchange heat between a hot exhaust gas flow and a cooling medium, comprises a first pipe (1) for flowing the hot exhaust gas flow and a second pipe (2) for flowing the cooling medium. One of the pipes runs into the other so that an external wall of the pipe is turned to a internal wall of the pipe. The wall of the first pipe is provided with the exhaust gas flow and/or the wall of the second pipe is provided with a nano-coating, which is applied as polysiloxane resin on sol-gel basis with nano-particles. The heat exchanger useful in district heating power station to exchange heat between a hot exhaust gas flow and a cooling medium, comprises a first pipe (1) for flowing the hot exhaust gas flow and a second pipe (2) for flowing the cooling medium. One of the pipes runs into the other so that an external wall of the pipe is turned to a internal wall of the pipe. The wall of the first pipe is provided with the exhaust gas flow and/or the wall of the second pipe is provided with a nano-coating, which is applied as polysiloxane resin on sol-gel basis with nano-particles. The superficial silicon atoms of the nano-coating are fluoridated. The first pipe has cooling lamellas at its pipe external wall, which is provided with a porous copper coating. The pipe internal wall of the first pipe is provided with the nano-coating. The second pipe runs in the first pipe. An independent claim is included for a method for coating a pipe wall standing in contact with hot exhaust gas flow in a heat exchanger with a nano-coating.