Countercurrent direct-heating-type heat exchanger

摘要

The countercurrent direct-heating-type heat exchanger that is able to suppress drift in the case when a fluid to be 5 heated is supplied, to prevent local abrasion of the members and also to carry out efficient heat exchange. The countercurrent direct-heating-type heat exchanger equipped with a feed pipe, a feed nozzle, ring-like straightening plates and umbrella-type dispersing plates of the 10 above fluid to be heated, characterized in that the above feed nozzle has the shape of a pipe having a circular cross section and the dimension satisfying the following formula (1) and formula (2): Formula (1): Ln / Dn > 1 15 (wherein, Ln indicates the length of the feed nozzle; and Dn indicates the inside diameter of the feed nozzle) Formula (2): 1.5 Sp /Sn 2.0 (wherein, Sp indicates the inner cross-sectional area of the feed pipe; and Sn indicates the inner cross-sectional area of 20 the feed nozzle). Figure 1