The invention discloses an energy-saving environment-friendly 
liquid slag removal type 
coal-fired 
heating system, which comprises a pulverized 
coal feeding device, an air distribution device, an ignition device, a liquid and 
slag collection device, a burning-out chamber, a high-temperature 
air preheater, a plurality of air and 
smoke pipes and a vertical 
liquid slag removal type pulverized 
coal combustor, wherein the vertical 
liquid slag removal type pulverized coal 
combustor is communicated with the burning-out chamber. The pulverized coal inlet, the oil inlet and the air inlet of the 
combustor are respectively connected with the pulverized coal feeding device, the ignition device and the air distribution device through pipes. A secondary prewhirling chamber, a 
combustion chamber and a 
slag removal chamber are sequentially and vertically communicated in the combustor. The 
slag removal chamber is connected with a liquid collection device. The side wall of the lower part of the 
combustion chamber is horizontally and axially communicated with a combustor 
flame outlet which is arranged in a direction consistent with secondary air whirling direction and is tangent with the inner wall surface of the combustor. The outlet of the combustor 
flame outlet is connected with a high-temperature 
smoke inlet. A high-temperature 
smoke outlet is arranged at the top end of the burning-out chamber and the bottom end of the burning-out chamber is connected with a 
solid slag collection section. The high-temperature 
air preheater is arranged on the high-temperature smoke outlet. Moreover, the 
system additionally comprises a 
heat supply pipe communicated with the high-temperature 
air preheater. The entire coal-fired 
heating system is connected with a heating device through the 
heat supply pipe arranged above the high-temperature air preheater.