JPH0438443B2 - - Google Patents

Description

Detailed Description of the Invention The present invention removes water vapor contained in combustion exhaust gas generated by burning hydrocarbon fuel, etc., and discharges the combustion exhaust gas with reduced absolute humidity to the outside. The present invention relates to a hot water supply device.

The combustion exhaust gas generated by burning hydrocarbon fuel contains a large amount of water vapor. This exhaust gas cools down and forms condensation in the chimney and flue, which causes corrosion in the chimney and flue. let When the temperature is low, such as in the winter, when water heaters are used as combustion equipment in homes, and space heaters that use the hot water, the combustion exhaust gas becomes an unsightly white smoke that can be mistaken for a fire. There is.

An object of the present invention is to provide a hot water supply device that can separate water vapor contained in combustion exhaust gas and discharge the exhaust gas to the outside in a lowered temperature state.

The present invention includes (a) a boiler 1, (a1) a burner 3 that burns gas fuel, (a2) a combustion chamber 2 formed above the burner 3,
Cylindrical body 31 arranged above surrounding burner 3
(a3) A boiler 1 including a heat exchanger 4 disposed in a pair of cylinders 1 and supplied with water to be heated; (b) a housing 6 having an axis extending approximately horizontally;
(b1) a horizontal upper part 32; (b2) an end plate 33 provided at one end of the axis and hanging down from the upper part 32; and (b3) a side connected to the upper part 32 at the other end of the axis. The aperture part 34 is tapered toward the
(b4) A drain receiving part 11 that extends between the end plate 33 and the constriction part 34 and tapers downward, and has a drain hole 12 formed at the lowest part thereof; (b5 ) Extending downward near the end plate 33 of the axis, and connecting the lower part of the end plate 33 and the drain receiving part 11
(c) a housing 6 comprising: a connecting pipe line 5 disposed between the pipes and connected to the upper part of the cylindrical body 31; 9 and (d) an air guide tube 35, which (d1) is closer to the other end of the axis than the drain hole 12, extends vertically through the drain receiver 11, and has a lower end 16. (d2) One end is connected to the upper end of the first riser 36 within the housing 6, the other end passes through the end plate 33, and the first riser 36 is opened horizontally along the axis. (d3) a heat exchanger tube 15 having fins 14 formed on its extending outer peripheral surface; (d3) a heat exchanger tube 1 outside the housing 6;
(d4) a second riser pipe 37 connected to the other end of the housing 6 and extending above the housing 6; (d4) a second riser pipe 37 connected to the upper end of the second riser pipe 37 and extending above the housing 6 along the axis (d5) a horizontal connecting pipe 38 extending near the other end of the housing 6; ,
The protruding lower end 39 in the housing 6 is located at approximately the same height as the upper part of the outlet pipe 9 and at a position above the upper surface of the heat transfer tube 15 of the downcomer pipe 4.
0; (e) an air guide tube 35 provided in the outlet conduit 9 and provided with the housing 6;
This is a hot water supply device characterized by comprising: an induction fan 10 that induces exhaust gas in the water;

FIG. 1 is a sectional view showing the configuration on which the present invention is based. In the boiler 1, hydrocarbon fuel is burned in a combustion chamber 2 by a burner 3, and water is heated by a heat exchanger 4. Combustion exhaust gas from the combustion chamber 2 is passed from a pipe 5 to a heat exchanger. It is guided into a housing 6 that extends in the horizontal direction. This housing 6 is provided with a heat exchanger tube 7 inserted through a side wall 6a of the housing 6. Air at room temperature is introduced into the heat exchanger tube 7 from the outside. Fins 14 are formed on the outer peripheral surface of the heat exchanger tube 7 . The end 8 of the heat exchanger tube 7 is open at a mixing region 22 toward an outlet conduit 9 formed at the end of the housing 6 . An attraction fan 10 is provided within the outlet pipe 9.

A drain receiving portion 11 is formed in the lower part of the housing 6 and is tapered downward. Condensed water in the combustion exhaust gas is discharged to the outside from a drain hole 12 formed in this drain receiving portion 11 .

When the exhaust gas from the boiler 1 is drawn from the pipe line 5 into the housing 6 by the induction fan 10, it undergoes co-current heat exchange with room temperature air whose temperature is lower than the dew point of the exhaust gas by the heat transfer tube 7. However, when the exhaust gas becomes lower than the dew point, it is cooled and dehydrated. The exhaust gas cooled by the heat transfer tube 7 and the air flowing through the heat transfer tube 7 and heated are mixed in the mixing region 22 near the end portion 8 . The exhaust gas is thereby heated and diluted by the air from the end 8. Therefore, the temperature of the mixed gas discharged from the outlet pipe 9 to the outside decreases. In this way, even if the gas is guided from the outlet pipe 9 to the chimney or flue, there is no risk of it being cooled and forming condensation, and therefore corrosion will not occur, and in the chimney or flue. A configuration for discharging condensed moisture to the outside is not required. Furthermore, since the gas from the outlet pipe 9 has a low temperature, it does not become white smoke even when the temperature is low, such as in winter.

FIG. 2 shows a cross-sectional view of one embodiment of the invention.
This embodiment is similar to the underlying configuration of FIG. 1, and corresponding parts are provided with the same reference numerals. It should be noted that a heat exchanger tube 15 is inserted into the housing 6 of the heat exchanger, and ambient temperature air from the outside is sucked through the end 16 of the tube. The heat exchanger tube 15 is provided with fins 17 . The air passing through the heat transfer tubes 15 undergoes countercurrent heat exchange with the exhaust gas from the boiler 1 via the connecting pipe line 5. The heated air from the heat exchanger tube 15 is
Second riser pipe 37, connecting pipe 38 and downpipe 3
9 into a mixing region 23 of the housing 6 close to the outlet line 9. Such an embodiment also reduces the temperature of the gas discharged to the outside from the outlet line 9.

The boiler 1 includes a burner 3, a cylinder 31, and a heat exchanger 4.
It is equipped with The burner 3 is primarily powered by gaseous hydrocarbons, as clearly shown in FIG. Further, the cylinder body 31 is arranged above the burner 3 to surround it, and a combustion chamber 2 is placed above the burner 3.
form. The heat exchanger 4 is disposed within the cylindrical body 31 and supplies water to be heated by converting it into hot water.

The housing 6 includes a horizontal upper portion 32, an end plate 33, a drain receiving portion 11, and a connecting pipe 5. The exhaust gas generated in the boiler 1 exchanges heat with the air in the heat exchanger tubes 15 within the housing 6, is cooled below the dew point, and is separated into drains.

The air guide pipe 35 is connected to the first riser pipe 36 and the heat transfer pipe 1
5, the second rising pipe 37, the connecting pipe 38, and the falling pipe 4
0. Lower end 1 of the first riser pipe 36
The room-temperature air sucked in from the down pipe 40 is heated by exchanging heat with external exhaust gas in the heat exchanger tube 15.
In a mixing region 23 inside the housing 6, the drain is mixed with the cold exhaust gas from which the drain is separated.

The exhaust gas and air mixed in the mixing area 23 are attracted by the induction fan 10 and discharged to the outside through the outlet pipe 9.

The operation of the embodiment will be explained with reference to the psychrometric diagram shown in FIG. Straight line l2 is a tangent drawn from point A indicating the state of outside air temperature to saturation line l1. The state of the combustion gas in the boiler 1 in the upper left region of this straight line l2 is indicated by reference mark B. When the exhaust gas in the state indicated by reference numeral B is released into the atmosphere in state A, it turns into white smoke. straight line l
If the gas in the lower right region of 2 is directly released into the atmosphere in state A, no white smoke (condensation or white smoke) will occur. The condition of the exhaust gas at the position indicated by reference numeral 21 in FIG. 2 near the outlet line 9 in housing 6 is indicated by reference numeral C in FIG. The exhaust gas moves from state B to state C, giving enthalpy Δi1 to the air in the heat exchanger tube 15, and the air passing through the heat exchanger tube 15 gains enthalpy Δi2 and is heated. The condition of the air passing through the heat transfer tube 15 in FIG. 2 and reaching the outlet 21 of the pipe line 18 is as follows.
It is designated by reference D in the figure. If the flow rate of exhaust gas in the mixing region 23 where exhaust gas and air are mixed is 1 Kg/hr, and the flow rate of the air is mKg/hr, the first equation holds true.

Δi ₂ = Δi ₁ /m ...(1) Exhaust gas in state C 1Kg/hr and air in state B mKg/
hr and mixed in the mixing region 23, the state of the mixed gas is indicated by reference numeral E. Point E is
This is a point that internally divides the straight line connecting points C and D in FIG. 3 into m:1 ratio. The mixed gas in state E has a margin of temperature Δt1 before it becomes white smoke, that is, before it intersects the straight line l2, and the temperature reaches the saturation line l1 (Δt1+Δt2) before it condenses in the flue or chimney. ). In this way, the exhaust gas from the boiler 1 is prevented from becoming white smoke, and since the temperature of the gas discharged from the outlet pipe 9 is low, the heat-resistant material of the flue and chimney guided from the outlet pipe 9 is It is easy to reduce heat resistance performance. It also simplifies the insulation of chimneys and flues.

According to experiments conducted by the inventor of the present invention, in the embodiment shown in FIG.
279kcal/hr, and the air heated by this at room temperature, say 5℃, has an air supply amount of 12Nm ³ /hr (=
15.5Kg/hr), it is heated to 80℃. The amount of drain obtained at this time is 0.17Kg/hr. The displacement at outlet pipe 9 is 16.6Kg/hr (=
15.8Nm ³ /hr). Its exhaust temperature is 63.1°C and its humidity is 0.039Kg/hr.

As described above, according to the present invention, the exhaust gas from the burner 3 is heat-exchanged with room temperature air whose temperature is lower than the dew point of the exhaust gas through the heat exchanger tube 15, and the exhaust gas is cooled to a temperature lower than the dew point and dehydrated. However, this heat transfer tube 15
The exhaust gas from the outside is mixed with the air from the air guide tube 35 that has passed through the heat transfer tube 15, and the exhaust gas is heated and diluted by the air, so that the humidity of the gas discharged to the outside is reduced. This prevents white smoke and condensation from forming.

Furthermore, in the present invention, heat exchange between the exhaust gas and air in the housing 6 is performed in countercurrent flow, so that the heat exchange efficiency is high. Also, air at room temperature is supplied to the first riser pipe 36.
Then, it is guided to the heat exchanger tube 15, and at this outlet, the second
The riser pipe 37 is led to the horizontal connecting pipe 68, etc., and the difference in specific gravity caused by the heating is utilized. The aperture part 3 is
4, in addition to the attraction force by the attraction fan 10, the Ventury effect can also be used, and a sufficient amount of air can be attracted even without an air fan.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an apparatus showing the basic structure of the present invention, Fig. 2 is a sectional view of an embodiment of the invention, and Fig. 3 is a hygrodynamic diagram for explaining the operation of the embodiment. be. DESCRIPTION OF SYMBOLS 1... Boiler, 6... Housing, 9... Outlet pipe line, 10... Induction fan, 11... Drain receiving part, 12... Drain hole, 7, 15... Heat exchanger tube, 1
4, 17... Finn, 22, 23... Mixed area.

Claims (1)

[Claims] 1(a) A boiler 1 comprising: (a1) a burner 3 that burns gas fuel; (a2) a combustion chamber 2 formed above the burner 3;
Cylindrical body 31 arranged above surrounding burner 3
(a3) A boiler 1 including a heat exchanger 4 arranged in a pair of cylinders 31 and supplied with water to be heated; (b) A housing 6 having an axis extending approximately horizontally.
(b1) a horizontal upper part 32; (b2) an end plate 33 provided at one end of the axis and hanging down from the upper part 32; and (b3) a side connected to the upper part 32 at the other end of the axis. The aperture part 34 is tapered toward the
(b4) A drain receiving part 11 that extends between the end plate 33 and the constriction part 34 and tapers downward, and has a drain hole 12 formed at the lowest part thereof; (b5 ) Extends downward near the end plate 33 on the axis, and connects the lower part of the end plate 33 and the drain receiving part 11.
(c) a housing 6 comprising: a connecting pipe line 5 disposed between the pipes and connected to the upper part of the cylindrical body 31; 9 and (d) an air guide tube 35, which (d1) is closer to the other end of the axis than the drain hole 12, extends vertically through the drain receiver 11, and has a lower end 16. (d2) One end is connected to the upper end of the first riser 36 within the housing 6, the other end passes through the end plate 33, and the first riser 36 is opened horizontally along the axis. (d3) a heat exchanger tube 15 having fins 14 formed on its extending outer peripheral surface; (d3) a heat exchanger tube 1 outside the housing 6;
(d4) a second riser pipe 37 connected to the other end of the housing 6 and extending above the housing 6; (d4) a second riser pipe 37 connected to the upper end of the second riser pipe 37 and extending above the housing 6 along the axis (d5) a horizontal connecting pipe 38 extending near the other end of the housing 6; ,
The protruding lower end 39 in the housing 6 is located at approximately the same height as the upper part of the outlet pipe 9 and at a position above the upper surface of the heat transfer tube 15 of the downcomer pipe 4.
0; (e) an air guide tube 35 provided in the outlet conduit 9 and provided with the housing 6;
A hot water supply device characterized by comprising: an induction fan 10 that induces exhaust gas inside;