Two-stage heat recovery type cyclone dust removal coal-fired boiler

Abstract

The invention discloses a two-stage heat recovery type cyclone dust removal coal-fired boiler.A high-temperature tail gas tube of a boiler body is connected with an induced draft fan through an air preheating plate type heat exchanger, a water preheating shell-and-tube heat exchanger tube pass and a cyclone dust collector.A high-position soft water pond is preheated through a water preheating shell-and-tube heat exchanger shell pass and then supplies water to the boiler through a high-pressure pump system.A coupler and a fan shaft, and fan impellers and the fan shaft of the induced draft fan are assembled through threads, and the thread screwing direction is the same as the automatic locking direction of working and bearing.After the fan impellers compress a copper-lead torsion composite gasket, thread rigid connection is formed by the fan shaft.By means of clamping parts, the coupler and the other end of the fan shaft form rigid connection.By means of the two-stage heat recovery type cyclone dust removal coal-fired boiler, two-stage heat recovery and purification treatment of boiler tail gases are achieved, more importantly, the dismounting technology of the boiler induced draft fan is greatly improved, the problem that the boiler draft fan continuously and automatically locks under the load action and is not easy to dismount due to thread assembling can be effectively solved, and the two-stage heat recovery type cyclone dust removal coal-fired boiler is especially suitable for convenient dismounting after thread locking of large boiler draft fans.

Description

technical field [0001] The invention relates to a two-stage heat recovery cyclone dedusting coal-fired boiler which is convenient for dismantling and maintenance of an induced draft fan. Background technique [0002] Boilers are widely used thermal power equipment. The long-term operation of the fan is inseparable from the air supply and dust removal of the boiler. Therefore, the fan is the key equipment of the boiler. The larger the tonnage of the boiler, the larger the fan used. The structure of ordinary fans is generally that one end of the fan shaft is the fan impeller, and the other end is the power input end of the motor, often a coupling. Since the fans in the boiler generally run continuously for a long time, the bearings are easily damaged. To replace the bearings, it is generally necessary to disassemble the fan impeller and the coupling at the other end, but the existing boiler fan shaft, fan impeller, and coupling assembly It is a typical shaft and hole interfer...

AI Technical Summary

Problems solved by technology

In the actual assembly of shafts and holes with transmission threads, in order to achieve large load-bearing functions, the size of the threaded shafts and matching nut-like components are relatively large, and it is often easy and convenient to screw in during assembly, and It can realize the automatic and continuous locking of the bearing capacity during use, so it is very reliable, but when it is disassembled, the assembly is often very tight, and disassembly is very difficult. It is particularly important to realize simple and easy disassembly under this condition

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