JPS5849482Y2 - Fire pipe type water heater - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to a feed water heater used to obtain steam or hot water using high-temperature gas such as exhaust gas from an easel engine or a gas turbine as a heat source.

Conventional water supply heaters of this type are woodwind type, so if the amount of water held is small and the temperature and flow rate of the high-temperature gas fluctuate, the hot water inside the heater will evaporate, and the amount of hot water supplied will be greatly affected by these fluctuations. It is inconvenient to use hot water.

To solve this problem, it is possible to use a smoke tube type water heater, but if a large number of smoke tubes are provided inside the heater so that a large amount of high-temperature gas can flow, when high-temperature gas is passed through a group of dense smoke tubes, the central part of the group of smoke tubes There is a temperature difference between the temperature of the pipe and the temperature around the flue group, and the temperature in the center becomes higher, and the temperature difference with the high-temperature gas is smaller than in the surrounding area where the temperature is low, so the amount of heat absorbed in the center decreases. .

This invention was made in response to the above-mentioned problems, and the purpose is to provide a water heater that not only can provide a large amount of hot water at all times, but also has high thermal efficiency.

An embodiment of this invention will be described below with reference to the drawings.

Reference numeral 1 denotes a heater body, in which a large number of smoke tubes 2 are fixed to both upper and lower tube plates 3 and 4 and arranged in the vertical direction.

This smoke pipe 2 uses a spiral pipe with spiral protrusions on the inner surface of the pipe.

Reference numeral 5 denotes an annular water supply main pipe that surrounds a smoke pipe group 6 consisting of a large number of smoke pipes 2 at the inner bottom of the body 1, and is fixed to the body 1 with a return interval d between it and the lower tube plate 4. ing.

Reference numeral 7 denotes a water supply branch pipe that supplies water to the gap 9 between the smoke pipes 2 at the inner bottom of the body 1, and is branched into a plurality of pipes from a single water supply main pipe 5 and connected in a radial bridging manner between the smoke pipe groups 6. It is located at the bottom of the gap 9 between the smoke pipes 2.

The water supply main pipe 5 has an annular shape passing through the plurality of smoke pipes 2 on the inner periphery, and both ends of the water supply branch pipes 7 are connected to the water supply main pipe 5.
is connected to.

As shown in FIG. 3, a large number of water supply holes 10 are provided on the lower surface of this water supply branch pipe 7, and these water supply holes 10 are connected to the lower tube plate 4.
It should be located close to and facing this.

The opening direction a of this water supply hole 10 may be any direction as long as it faces toward the lower tube sheet 4 side, but it is preferable that the opening direction a be slightly inclined from vertically downward as shown in FIG.

11 is a water supply nozzle that communicates with the water supply main pipe 5; 12 is a water supply pipe that supplies water to the water supply nozzle 11 by the operation of the pump 13;
A switching valve 15 is provided in the middle of the water supply pipe 11 to switch the water supply from the water supply nozzle 11 side to the bypass pipe 14.

16 is a water pipe 12 between the switching valve 15 and the water supply nozzle 11.
17 is a blow valve branched from the blow pipe.

18 is an auxiliary water supply nozzle communicating with the bypass pipe 14; 19;
20 is a hot water outlet, 20 is an exhaust gas introduction duct, and 21 is an exhaust gas discharge duct.

In the above configuration, the high temperature gas flows into the lower part of the body 1 through the duct 20 and passes through the inside of the smoke pipe 2, thereby heating the smoke pipe 2 and the water W around it.

In this case, since the smoke pipes 2 are closely spaced, the central part of the pipe group 6 tends to be hotter than the peripheral part, but in this design, the smoke pipes at the inner bottom of the body 1 are 2
Since low-temperature water W is supplied from the water supply branch pipe 7 running between the smoke pipes 6, the heating imbalance described above is corrected within the flue pipe group 6, and the water is heated almost uniformly in each part.

Next, when the switching valve 15 switches the water supply to the auxiliary water supply nozzle section 18 side and the blow valve 17 is opened, the water W is sucked into the water supply branch pipe 7 from the water supply hole 10 by the water pressure inside the body 1 (the fourth (see Figure B) is discharged to the outside through the water supply main pipe 5, water supply nozzle 11 and blow pipe 16.

At this time, since the water supply hole 10 is close to and facing the lower tube sheet 4, the can mud and sludge S accumulated on the tube sheet 4 are sucked into the water supply branch pipe 7 together with water and discharged to the outside. .

As mentioned above, this device is a smoke tube type heater, so even if there are fluctuations in the temperature and flow rate of high-temperature gases such as exhaust gas, it is less affected by this, and not only can a large amount of hot water be obtained at all times, but also a smoke tube type heater. Because low-temperature water is supplied from water supply pipes connected in the radial direction between the groups in a bridging manner,
There is no risk that the central part of the flue group will become significantly hotter than the peripheral part, and the water is heated almost uniformly in each part, resulting in high thermal efficiency.

In addition, a water supply hole 10 is opened on the lower surface of the water supply branch pipe 7, and a valve (in this embodiment, a switch valve 15
By providing a blow valve 17), the water supply branch pipe 7 can also serve as a blow pipe. In that case, when the valve 15 is switched to the discharge side, the can mud and sludge at the inner bottom of the body 1 are discharged together with water. This not only saves the effort of cleaning, but also prevents a decrease in thermal efficiency due to sludge accumulation.

Further, since the water supply branch pipes are simply arranged between the groups of buried wood pipes, manufacturing and assembly are easy.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of the water heater according to this invention, Figure 2 is an enlarged sectional view taken along line II-II in Figure 1, and Figure 3 is a partial bottom view of the water supply main pipe and water supply branch pipes. Figure, Figure 4A
, A is an action explanatory diagram. 1... Heater body, 2... Smoke pipe, 3,
4... Upper and lower tube plates, 5... Water supply main pipe, 6
... Smoke pipe group, 7 ... Water supply branch pipe, 9 ...
...Gap, 10...Water supply hole.

Claims (1)

[Scope of utility model registration request] A smoke pipe consisting of a number of smoke pipes arranged vertically within the heater conductor and fixed to the upper and lower tube plates, and a single annular water supply main pipe passing through the above-mentioned many smoke pipes on the inner periphery. A plurality of water supply branch pipes branched from the water supply main pipe are arranged between the groups, and water supply holes are formed in the water supply branch pipes to supply water almost uniformly to the gaps of the smoke pipe groups, and the water supply branch pipes are , wherein both ends thereof communicate with the water supply main pipe, and the water supply hole is formed to face the lower tube plate.