FIELD: pulp-and-paper industry. SUBSTANCE: apparatus has heat-exchanger mounted on melt solvent tank at an angle to horizontal surface and faced with its lower wall to melt solvent tank, and suction pipe. Apparatus is provided with additional heat-exchanger arranged at an angle of 10-30 deg to horizontal plane and connected to first heat-exchanger through two pipes of complicated profile. Pipes are positioned on rear wall of first heat-exchanger, with space between pipes making 1/3 - 1/2 the width of heat-exchanger. Suction pipe is positioned on cover of additional heat-exchanger. Inclination angle of first heat-exchanger is 5-15 deg. Inclination angle ratio of additional and first heat-exchangers is 2-6. Pipes of first and additional heat-exchangers are arranged in staggered rows. EFFECT: increased efficiency and simplified construction. 3 cl, 1 dwg
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