Kiln and heating method thereof

A kiln, comprising:

• a stove, including a cavity, an entry, and an air outlet, wherein the cavity includes a front section and a rear section;
• the front section communicates with the entry, while the rear section is away from the entry;
• a top wall surface of the front section tilts downwardly toward the entry;
• the air outlet is located between a top of the front section and the entry;
• a combustion device, disposed in the rear section of the cavity and including at least one burner, a supporting assembly, and an infrared ray generation assembly, wherein the at least one burner includes a flame outlet;
• flames are generated from the flame outlet by burning gas via the at least one burner;
• the supporting assembly includes a cover plate which is disposed above the at least one burner and includes at least one hollow portion;
• the infrared ray generation assembly is mounted to the supporting assembly and is located above the cover plate;
• the infrared ray generation assembly is heated by the flames generated by the at least one burner to generate infrared ray;
• the infrared ray generation assembly includes an emission surface which is corresponding to the at least one hollow portion and adapted to emit the infrared ray;
• and an exhaust pipe, communicating with the air outlet;
• wherein the infrared ray generation assembly includes an infrared ray generation mesh, and a surface of the infrared ray generation mesh is the emission surface;
• wherein the infrared ray generation assembly includes a reflection plate having a reflection surface;
• the infrared ray generation mesh includes another emission surface which is opposite to the reflection surface, while the emission surface of the infrared ray generation mesh faces the reflection surface;
• the reflection surface is concaved toward a direction away from the infrared ray generation mesh.