Tail heat recycling and dust removing type coal-fired boiler

Abstract

The invention discloses a tail heat recycling and dust removing type coal-fired boiler. The tail heat recycling and dust removing type coal-fired boiler comprises a boiler main body and an induced draft fan. An exhaust gas pipe of the boiler main body is connected with the induced draft fan sequentially through an air preheater, a water preheater, a cyclone dust remover and a granite dust remover and then is emptied. The air inlet end of the shell pass of the air preheater is connected with an air blower, and the air outlet end of the shell pass of the air preheater is connected with the boiler main body. A water inlet pipe of the shell pass of the water preheater is connected with a high-position water tank, and a water outlet pipe of the shell pass of the water preheater is connected with a boiler water inlet pump. An impeller of the induced draft fan is provided with vanes adopting a structure in a shape of a hollow reverse water droplet. The external contour line of the induced draft fan is an involute. The tail heat recycling and dust removing type coal-fired boiler carries out two-stage counterflow heat exchange and dry and wet two-stage dust removal on boiler exhaust gas so as to realize tail heat recycling and dust removing operation and realize energy conservation and emission reduction. As the vanes adopt the structure in the shape of the hollow reverse water droplet, dust on the impeller of the induced draft fan is cleared in real time, the impeller strength of the fan is increased, the stability is enhanced, and safety accidents caused by dust accumulation are effectively avoided. The application prospect is wide.

Description

technical field [0001] The invention relates to a coal-fired boiler, in particular to a tail heat recovery and dust-removing coal-fired boiler in which a fan does not accumulate dust. Background technique [0002] Boilers are very commonly used thermal power equipment. Coal-fired boilers are still one of the main preferred equipment for heating due to mature technology and low fuel costs. However, coal-fired boilers need to Carry out tail heat recovery, dust removal, harmful gas purification and other operations on the tail gas. [0003] The induced draft fan is the key equipment for coal-fired boilers to realize tail heat recovery and dust removal. Most of the induced draft fans for boilers are centrifugal fans. The continuous, stable and reliable operation of the induced draft fans is very important. Because most of the occasions where coal-fired boilers are used contain certain dust , When the induced draft fan is working, when the air flow passes through the high-speed ...

AI Technical Summary

Problems solved by technology

Once part of the hardened dust is shaken off, it will immediately leave the dynamic rotation balance of the induced draft fan, and then generate strong vibration, which may cause serious personnel and equipment safety accidents

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