GAS-EXTRACTABLE PULVERIZED COAL BOILER

摘要

A gas-extractable pulverized coal boiler (100) comprises a boiler main body (1) defining a hearth (11); a regenerative rotating commutating heater (2); a fume passage (3), wherein an inlet end of the fume passage (3) is communicated with the hearth (11) and an outlet end of the fume passage (3) is communicated with the regenerative rotating commutating heater (2), so that fume in the hearth (11) is delivered into one of at least paired accommodating portions (25) and exchanges heat with a heat carrier (23) accommodated in the accommodating portion (25), and multiple superheaters are provided in the fume passage (3); an air passage (4), used for delivering air at least into the other one of the paired accommodating portions (25), so that a heat carrier (23) accommodated in the accommodating portion (25) exchanges heat with air; a high-temperature gas-extracting passage (5), wherein one end of the high-temperature gas-extracting passage (5) is communicated with one end of the fume passage (3) facing the hearth (11), and the other end of the high-temperature gas-extracting passage (5) is communicated with the outlet end of the fume passage (3); and a gas-extracting control unit (51), used for controlling a first amount of fume supplied through the high-temperature gas-extracting passage (5). By means of the pulverized coal boiler, the air preheating temperature is raised and controllable operation is achieved, the thermal efficiency of the boiler is improved, and the problem of operation stability and reliability of a large-scale boiler which carries out power generation with a low volatile content is solved.