JPH0351676Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a heat exchanger that uses combustion exhaust gas, which prevents soot from scattering and facilitates its discharge, as a heat source.

[Technical background of the invention and its problems] Conventionally, a heat exchanger that uses combustion exhaust gas as a heat source has a large number of heat exchange tubes arranged, and the combustion exhaust gas flowing inside the tubes and the heated fluid flowing outside the tubes. There is a lotus root type structure shown in Fig. 3 that exchanges heat with air.

That is, in FIG. 3, 1 and 2 are a combustion exhaust gas collection chamber and a distribution chamber arranged vertically, and 3' is an upper tube plate located horizontally below the combustion exhaust gas collection chamber. 4 is a lower tube plate located above the flue gas distribution chamber and provided horizontally; 5 is a heat exchange tube connected in parallel to the upper and lower tube plates to communicate the flue gas collection chamber and the distribution chamber; 7 is a casing that surrounds the heat exchange tube group and is connected to the flue gas collection chamber and the distribution chamber; 8 is the flue gas inlet provided in the flue gas distribution chamber 2; and 9 is the flue gas provided in the flue gas collection chamber. Outlets 10 and 11 are inlets and outlets for air as a heated fluid provided in the casing. That is, a combustion exhaust gas passage 12 is formed inside the heat exchange tube, and an air passage 13 as a heated fluid is formed outside the heat exchange tube. The combustion exhaust gas is introduced into the passage 12 inside the heat exchange tube 5 from the combustion exhaust gas inlet 8 and is discharged to the outside from the combustion exhaust gas outlet 9. Air as a fluid to be heated is introduced from an air inlet 11 into a passage 13 outside the heat exchange tube, and is transferred to the outside of the system from an air outlet 10. At this time, when the flue gas flows from the flue gas passage into the flue gas collection chamber, the flow velocity of the flue gas changes, and the soot contained in the flue gas is separated and deposited on the upper tube sheet. Therefore, when the heat exchanger is operated on and off, the soot that has accumulated on the upper tube sheet during the initial passage of the combustion exhaust gas is drawn in and scattered outside the system, causing a pollution problem. Furthermore, if excessive soot accumulates, it will block the combustion exhaust gas passage and reduce the function of the heat exchanger, so the accumulated soot must be removed as appropriate from the soot cleaning port (not shown) provided in the combustion exhaust gas collection chamber. First, there is the problem that removal is difficult and dangerous due to working at heights.

[Purpose of the invention] The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a heat exchanger with a structure that eliminates the scattering of soot caused by entrainment of soot when the heat exchanger is started, and that facilitates cleaning of soot. It is about providing.

[Summary of the invention] In order to achieve the above object, the present invention has the following advantages:
As a form, the combustion exhaust gas collection chamber and the combustion exhaust gas distribution chamber are arranged one above the other, the lower surface of the combustion exhaust gas collection chamber is formed into an upper tube plate having an inclined surface, and the combustion exhaust gas collection chamber is located above the upper tube sheet and the combustion exhaust gas distribution chamber. The structure is such that the lower tube plate is connected to the lower tube plate through a heat exchange tube, and a soot discharge port is provided at the lowest part of the upper tube plate 3, so that soot can be naturally discharged.

[Embodiment of the invention] Hereinafter, the invention will be described based on an explanatory diagram of an embodiment shown in FIG. Reference numeral 3 in the drawing denotes an upper tube plate provided at the lower part of the combustion exhaust gas collecting chamber and to which the heat exchange pipes are connected. A soot discharge port 6 is formed in the soot discharge port 6.
One end of a soot discharge pipe is connected to the soot exhaust pipe to discharge soot, and the other end communicates with the outside of the system from the bottom of the heat exchanger. In addition, at the connection portion between the upper tube plate and the heat exchange tube, it is preferable to provide an extension A of the heat exchange tube on the combustion exhaust gas collection chamber side. The other symbols are the same as in FIG. 3, so their explanation will be omitted.

In the above configuration, the velocity of the flue gas flowing into the flue gas collection chamber from the flue gas passage is rapidly reduced, so that the soot contained in the flue gas is separated from the flue gas and falls onto the upper tube sheet. Since the upper tube plate is inclined in a slit shape, the fallen soot slides to the lowest part of the upper tube plate under its own weight and is discharged from the system through soot discharge. For this reason, there is usually almost no soot deposited on the upper tube sheet, so even during the initial stage of flue gas ventilation when the heat exchanger is turned on and off, the soot accumulated on the upper tube sheet is drawn in and the soot is heated. If it is scattered outside the exchanger system, there will be no damage. In particular, the above effect is further improved by providing an extension A of the heat exchange tubes on the upper tube plate. Note that when a heat exchanger is operated for a long period of time, soot gradually accumulates on the upper tube sheet because it has a large angle of repose. Since the soot is provided with a discharge pipe and guided out of the lower system of the heat exchanger, the accumulated soot can be easily discharged through the soot discharge pipe by simply pushing it toward the joint of the soot discharge pipe.

FIG. 2 is an explanatory diagram of another embodiment, in which the upper tube sheet 3 is formed as a tube sheet with a flat inclined surface, and the soot discharge port is provided in the casing located at the lowest end of the upper tube sheet. 6 is provided. Note that the other configurations and effects are the same as in the case of the swivel shape shown in FIG. 1, so explanations thereof will be omitted.

[Effects of the invention] As described above, the present invention has a structure in which the entire lower surface of the combustion exhaust gas collection chamber is formed into an upper tube plate with an inclined surface, and a soot discharge port is provided at the lowest part of this upper tube plate. It has been reported that the soot that has fallen onto the upper tube plate is easily discharged by its own weight, and even when the heat exchanger is turned on and off, the soot is engulfed by the initial ventilation of the combustion exhaust gas and scattered outside the heat exchanger system. Without,
Furthermore, soot that has accumulated due to long-term use can be easily removed by simply pushing it toward the soot discharge pipe joint. In particular, by providing a protrusion A of the heat exchange tube at the joint between the upper tube sheet and the heat exchange tube, soot scattering can be prevented for a long period of time.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of one embodiment of the present invention, and FIG. 3 is an explanatory diagram of a conventional embodiment. 1... Combustion exhaust gas collection chamber, 2... Combustion exhaust gas distribution chamber, 3, 3'... Upper tube plate, 4... Lower tube plate,
5... Heat exchange pipe, 6... Soot discharge port, 7... Casing, 8... Combustion exhaust gas inlet, 9... Combustion exhaust gas outlet, 10... Air outlet, 11... Air inlet passage, 12... Combustion exhaust gas, 13... air passage,
14... Soot discharge pipe, A... Outlet.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a configuration in which a required number of heat exchange pipes 5 and combustion exhaust gas passages 12 are provided between the upper flue gas collection chamber 1 and the lower flue gas distribution chamber 2. ,
A heat exchanger characterized in that the lower surface of the combustion exhaust gas collecting chamber is formed by an inclined upper tube plate 3, and a soot discharge port 6 is connected to the lowest part of the upper tube plate 3. (2) A request for registration of a utility model characterized in that, at the joint between the upper tube sheet 3 and the heat exchange tube, an extension A of the heat exchange tube is provided on the combustion exhaust gas collection chamber side of the upper tube sheet 3. The heat exchanger according to item 1.