Environment protection vertical bottom smoke-out underground flue coal-fired boiler

The utility model relates to an environment protection vertical coal-fired boiler capable of discharging smoke from the bottom through an underground flue. A coal-fired boiler chamber is arranged at the lower end inside a boiler body; a multi-pipe vertical secondary hot wind device for eliminating smoke and removing dust is connected with the upper part of the coal-fired boiler chamber; a heat gathering chamber is arranged above the multi-pipe vertical secondary hot wind device for eliminating smoke and removing dust; a plurality of fire pipes are connected with the circumference of the heat gathering chamber; the fire pipes are horizontally arranged in a radiation way from the heat gathering chamber to the circumference; the horizontal outer ends of the fire pipes are downwards bent in the boiler body and are directly communicated with the bottom of the boiler. The boiler overcomes the defects in combustion of the traditional boiler, really achieves the goals of no pollution and no noise and has the advantages of high efficiency and energy saving; simultaneously, the smoke discharging standard of the boiler is required to reach the national standard. The utility model achieves the goals of high efficiency and energy saving at the time of eliminating smoke and removing dust; simultaneously, because not provided with a blower and an induced draft fan, the utility model can save the running electricity consumption of the boiler and lower running cost; the smoke discharging blackness of the boiler can reach the first level of Ringelman blackness; the original dust discharging concentration of the boiler is lower than the requirement of the national standard.