U-bend pipe type heat exchanger

A U-bend pipe type heat exchanger, comprising:

• a heat exchanger main body surrounded by a front side plate, a back side plate, a left side plate, and a right side plate, and having open upper and lower portions through which a heat source passes;
• a plurality of U-bend pipes inserted between the left side plate and the right side plate, each of the plurality of U-bend pipes including two heat exchange pipes arranged in parallel with each other and a U-shaped pipe connecting one end portions of the two heat exchange pipes;
• and
• a plurality of water jackets attached to at least one of outward surfaces of the left side plate and the right side plate, and connecting open end portions of two adjacent heat exchange pipes such that a low-temperature water circulates along the plurality of U-bend pipes,
• wherein the U-shaped pipe of each of the U-bend pipes is fixed to an inward surface of one of the left side plate and the right side plate, and another end portions of the two heat exchange pipes are inserted to another one of the left side plate and the right side plate and connected to the water jackets,
• wherein at least one U-shaped pipe fixing part to which the U-shaped pipe of each of the U-bend pipes is inserted and fixed is installed in at least one of the left side plate and the right side plate, the at least one U-shaped pipe fixing part being configured by an assembly groove formed in the inward surface of the right side plate, and the assembly groove being a portion of the right side plate protruding outward,
• wherein the plurality of U-bend pipes includes:
• a CO reduction heat exchange pipe which is installed in a position spaced apart downwardly from the upper portion of the heat exchanger main body by a predetermined distance and has a first CO heat exchange pipe and a second heat exchange pipe arranged in parallel with each other;
• and a plurality of main heat exchange pipes installed below the CO reduction heat exchange pipe, each of the plurality of main heat exchange pipes having a heat exchange pin installed in an outer peripheral surface of each of the plurality of main heat exchange pipes,
• wherein each U-shaped pipe of the CO reduction heat exchange pipe is inserted to one of the at least one U-shape pipe fixing part configured by the assembly groove formed in the right side plate, and each U-shaped pipe of the main heat exchange pipes is inserted to another one of the at least one U-shape pipe fixing part configured by the assembly groove formed in the right side plate,
• wherein one of two heat exchange pipes constituting the first CO heat exchange pipe is fixed to the front side plate, and one of two heat exchange pipes constituting the second CO heat exchange pipe is fixed to the back side plate.