JPS6139079Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is, for example, equipped with a configuration that recovers and utilizes engine exhaust heat as an auxiliary heating source for hot water supply water in a hot water storage tank. The present invention relates to an engine exhaust heat recovery device in which an indirect heat exchange section between the engine exhaust and the heat medium is interposed in the supply path of the heat medium to the heat load device.

Such engine exhaust heat recovery devices are designed to effectively utilize engine exhaust heat, which has been wasted until now, as an auxiliary heat source for heat load devices such as hot water storage and heating. The more you increase the heat recovery rate and increase the thermoeconomic effect, the lower the exhaust gas temperature will eventually reach below the dew point, and the exhaust gas will become condensed drain, and when discharging this condensate, the exhaust pipe and surrounding equipment will be damaged. There are problems in that they become contaminated and lead to early corrosion.Furthermore, there are problems such as requiring a special device for drain discharge, and the discharge itself being difficult due to restrictions.

The purpose of the present invention is to rationally solve these problems and difficulties through simple structural improvements such as improved arrangement of the heat exchanger and modification of the muffler.

In the engine exhaust heat recovery device according to the present invention, the heat exchange section is provided in a portion of the exhaust passage upstream of a silencer connected to the engine exhaust passage, and the heat exchanger is provided in the exhaust passage part upstream of the silencer connected to the engine exhaust passage. Collecting condensate condensed by heat exchange in the exchange section, and
The present invention is characterized by comprising a drain recovery and evaporation section that heats and evaporates the recovered drain through heat exchange with exhaust gas.

In other words, when the load on the heat load device drops below a certain level, the exhaust drain condensed through heat exchange with a heat medium is heated and evaporated using the high-temperature exhaust discharged in a dry state. The most distinctive feature of this invention is that the drain recovery evaporation section is configured in a muffler that is generally provided at the end of the exhaust path. This prevents the evaporated exhaust condensate from becoming condensed condensate again before it is discharged from the exhaust path, as is the case when a separate silencer is installed upstream of the muffler. Furthermore, by using the casing of a muffler and the like as its constituent members, the overall structure of the drain recovery evaporation section can be easily constructed.

Therefore, the present invention simplifies the overall structure through simple structural improvements such as devising the arrangement of the heat exchange section with respect to the muffler and configuring the drain recovery evaporation section within the muffler. It has now been possible to reliably solve the aforementioned problems caused by the exhaust drain.

Embodiments of the present invention will be described below based on the drawings. The compressor 2 is driven by a water-cooled two-stroke engine 1 that uses gas G as fuel to compress a heat medium, and the first heat exchange section between the heat medium and outside air. 3. A second heat exchange section 4 between the heat medium and the air for cooling and heating, a third heat exchange section 7 between the heat medium and the water in the hot water storage tank 6 in the hot water storage type water heater 5, a liquid receiver 8, a pressure accumulator 9, and Four-way switching valve 1
0. A heat pump hot water heating and cooling system in which a group of on-off valves 11, a check valve 12, and a low-pressure trap valve 13 are interposed in a heat medium circuit 14 , which recovers the exhaust heat of the engine 1 and has recovered exhaust heat. A device for heating the heat load device 15 is incorporated.

To explain the hot water heating and cooling system in detail, it circulates and flows a heat medium through the compressor 2, the first heat exchange section 3, the liquid receiver 8, the second heat exchange section 4, and the compressor 2 in this order. A cooling operation state in which the air for heating and cooling is cooled by a condensing action in the heat exchange part 3 and an evaporation action in the second heat exchange part 4, the compressor 2 second heat exchange part 4, the receiver 8, and the The heat medium is circulated through the first heat exchange section 3 and the compressor 2 in order, and the air for heating and cooling is heated by the condensation effect in the second heat exchange section 4 and the evaporation effect in the first heat exchange section 3. In the heating operation state, the heat medium is circulated through the compressor 2, the third heat exchange section 7, the first heat exchange section 3, the liquid receiver 8, and the compressor 2 in this order,
Condensation action in the third heat exchange section 7 and the first heat exchange section 3
The hot water supply state heats the stored water with an evaporation effect at Then, the stored water is heated by a condensation effect in the third heat exchange part 7 and an evaporation effect in the second heat exchange part 4,
In addition, it is configured to be switchable to a hot water supply/cooling state in which air for air conditioning/heating is cooled.

In the figure, 16 is an outside air supply fan for the first heat exchange section 3, and 17 is an air supply fan for heating and cooling.

The heat load device 15 is the hot water supply device 5.
and the heating and cooling air can be heated, mainly,
It is comprised of a hot water type heating device 18 that is used when the heating load is large or when the above-mentioned heating and cooling device is switched to a cooling operation state for dewatering during the rainy season.

The above-mentioned exhaust heat recovery device has a heat dissipating section 22 in the cooling water circuit 21 with the pump 20 of the engine 1 that also serves as the heating device of the heat load device 15, and also has a cooling section 22 in the cooling water circuit 21 with the pump 20 of the engine 1. A detour 23 is connected to which a part of the water can be supplied to the outgoing portion 21A of the cooling water circuit 21 to the heat radiating section 22, and the detour 23 is used to heat and raise the temperature of the cooling water through heat exchange with the engine exhaust gas. By interposing the indirect heat exchange section 19, the heat loaded by the engine cooling water and the engine exhaust heat is used to
The heat radiating section 22 includes a heat exchange section 24 inserted into the hot water storage tank 6 and a heat exchange section 25 disposed near the second heat exchange section 4 . In addition, the cooling water circuit 21 can be connected to the heat exchange section 2 which should be the heat radiating section 22 by operating the valve 26 group.
4 and 25 are selected.

In the figure, 27 is an expansion tank.

The indirect heat exchanger 19 is provided in a portion of the exhaust passage 28 upstream of the vertical silencer 29 connected to the engine exhaust passage 28, and the indirect heat exchanger 19 is provided in the silencer 29. A drain recovery and evaporation section 30 is configured to recover condensed condensate through heat exchange with the exhaust gas, and to heat and evaporate the recovered condensate through heat exchange with exhaust gas, and includes an exhaust passage 28 upstream of the indirect heat exchange section 19. A catalytic device 31 is installed in the section to combust unburned gas in the exhaust gas, and by blowing the exhaust gas to the first heat exchange section 3, the first heat exchange section 3 and the supplied outside air are heated to perform heating operation. An exhaust pipe 33 with an on-off valve 32 that prevents frost formation on the first heat exchange section 3 under the condition is branched from a portion of the exhaust passage 28 upstream of the catalyst device 31, and 19, a muffler 29, and a catalyst 31 are integrated by joining their casings 19A, 29A, and 31A.

The drain recovery evaporation unit 30 is constructed by providing small drain holes 35 in the bottom plate 3 of the silencer 29 in each partition plate 34 in the silencer 29.
6, the heat load on the heat load device 15 is reduced and the temperature of the cooling water becomes high, thereby reducing the heat load on the indirect heat exchange section 19, and after the heat exchange. In this case, the recovery drain is also evaporated by the heating effect of the bottom plate 36 by the exhaust gas kept at a high temperature and the heating effect by contact with the exhaust gas.

39 is an intake path.

FIG. 3 shows another embodiment, which includes exhaust passage 2
8, an opening/closing part 37 is provided that can supply a part of the exhaust gas before heat exchange in the indirect heat exchange part 19 to the drain recovery evaporation part 30 in the muffler 29 without passing through the indirect heat exchange part 19. A detour path 38 is connected to the detour path 38. In this case, the on-off valve 37 is normally closed, and when the drain is collected in the drain recovery evaporation section 30, the on-off valve 37 is opened.
The collected condensate can be heated and evaporated with high temperature exhaust gas before heat exchange.

In the embodiment, the cooling water circuit 21 constitutes the heat medium supply path, but the engine exhaust heat recovery device according to the present invention may be one that recovers only exhaust heat.

Furthermore, target engines include engines for power generation, pump drive, etc. installed in factories and housing complexes, in addition to those for air conditioning systems explained in the embodiments.

[Brief explanation of the drawing]

The drawings show an embodiment of the engine exhaust heat recovery device according to the present invention, FIG. 1 is an overall piping configuration diagram, FIG. 2 is an enlarged longitudinal sectional front view of the main parts, and FIG. 3 is a schematic diagram showing another embodiment. FIG. 15...Heat load device. 21...heat medium supply path,
DESCRIPTION OF SYMBOLS 1... Engine, 28... Exhaust path, 29... Silencer, 30... Drain recovery evaporation section, 19... Indirect heat exchange section.

Claims (1)

[Claims for Utility Model Registration] In the middle of the supply path 21 of the heat medium for heating the heat load device 15 to the heat load device 15, there is an indirect heat exchange section 1 between the exhaust gas of the engine 1 and the heat medium.
In the engine exhaust heat recovery device in which an engine exhaust heat recovery device 9 is provided, the heat exchange section 19 is connected to the engine exhaust path 2.
Exhaust path 2 upstream of the silencer 29 connected to 8
A drain recovery evaporator is installed in the muffler 29 to recover condensate condensed through heat exchange in the heat exchange section 19, and to thermally evaporate the recovered condensate through heat exchange with the exhaust gas. An engine exhaust heat recovery device comprising a section 30. The engine exhaust heat recovery device according to claim 1, wherein the heat exchange section 19 and the muffler 29 are integrated. The engine exhaust heat recovery device according to claim 1 or 2, wherein the heat medium flowing through the supply path 21 is engine cooling water. The engine exhaust heat recovery device according to any one of claims 1 to 2, wherein the heat load device 15 is a hot water storage tank, or a hot water storage tank and a heating radiator that can be used interchangeably.