| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas heat exchanger having a superior acid corrosion resistance, capable of quite easily and efficiently performing inspection, repairing and replacement of a heat transfer pipe and having a simple structure.SOLUTION: A heat exchanger shell 1 has a fixable or removable lid plate 11, its inner side is partitioned into an upstream side sub-chamber 13 and a downstream side sub-chamber 14 and a water conduction pipe passage 4 is connected between both sub-chambers 13, 14 through each of connection headers. Many heat transfer pipes 2 suspended from the heat exchanger shell show double-pipes by an outer pipe having lower end closed and coated with fluorine resin and an inner pipe of fluorine resin having its lower end opened, every plurality of pipes constitute a group of pipes corresponding to each of the headers, each of the outer pipes is inserted, fitted and fixed to bottom walls 15 of both sub-chambers at its opened upper end part, upper sides of the inner pipes are extended into the sub-chambers, collected at their corresponding headers and communicated therewith, cold water W1 fed into the inlet header 31 is heat exchanged with combustion exhaust gas G1 of high temperature at a process reaching the outlet header 32 while being reciprocated in each of the heat transfer pipes and then the water is fed out as hot water W2.SELECTED DRAWING: Figure 1 |
