Direct linked internal gas boiler

The utility model provides a direct linked internal coal gas boiler, comprising a boiler body. The utility model is characterized in that the boiler body is a closed hearth; the air outlet of a coal gas generator is communicated with the burning chamber of the boiler body through a tubular direct connector. The direct connector consists of an inner tube and an outer tube which are sleeved together; the inner and the outer tubes are respectively a fuel gas tube and an air tube; the air outlet sections of the tubes are both flat trumpet mouth shapes; the trumpet mouth shape section of the inner tube is opened with a plurality of air mixing mouths along the axial direction; the outer tube is provided with a secondary wind mouth. The boiler body is the body of coal gas boiler for removing the dust removal device, the draught fan, the blower, the slag out-coming machine and the grate. The two side walls and the tail part of the boiler body are all provided with explosion proof devices. The utility model is simple in structure, low in production cost, low in use cost, small in pollution, and high in heat efficiency, which is suitable for the changing and alternation of the mini-type coal gas boiler and is easy to be popularized widely.