JP3511059B2 - Drain water treatment system for engine exhaust gas - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating drain water in engine exhaust gas for treating drain water produced when engine exhaust gas is cooled, for example.

[0002]

2. Description of the Related Art When the exhaust gas of an engine is cooled, water vapor in the exhaust gas, vapor of an acid component due to NOx or SOx, and vapor of oil component are condensed to generate acidic drain water containing oil component. .

For example, in an engine-driven heat pump device, an exhaust heat exchanger is arranged, so the exhaust gas temperature drops. This exhaust heat exchanger is arranged in the middle of an exhaust passage for releasing exhaust gas of the engine from above the engine into the atmosphere. Also, the water vapor component in the exhaust gas is
Since the exhaust heat exchanger condenses due to heat exchange, a drain water passage is arranged to prevent accumulation in the exhaust pipe, and the drain water passage is guided below the exhaust passage.

The drain water is formed by condensing condensed acid with a liquid acid formed by dissolving the acidic gas in the exhaust gas or a vapor-like acid formed by reacting the acidic gas with steam. Therefore, a neutralizer is arranged in the middle of the drain water passage to reduce the acidity so that the drain water is discharged below the exhaust passage.

[0005]

By the way, in addition to drain water in which acid is dissolved due to acid gas, exhaust gas enters the drain water passage, and this exhaust gas passes through the upper part of the neutralizer to generate exhaust gas. The gaseous acid or acidic gas component contained in the gas may be discharged to the outside from the drain water discharge port without being neutralized. At the time of this discharge, the acidic gas component is dissolved in the drain water or the vapor-like acid is condensed and mixed into the drain water, and the neutralized drain water is acidified again,
On the way of draining the acidified drain water, there is a possibility that, for example, the basic concrete of the outdoor unit or the surrounding concrete may be corroded.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a drain water treatment apparatus for engine exhaust gas which suppresses an increase in the acidity of drain water due to the entry of exhaust gas.

[0007]

In order to solve the above problems, the apparatus for treating drain water in engine exhaust gas according to claim 1 is connected in the middle of an exhaust passage, and a neutralizer is arranged in the middle. by the middle of the drain water passage to neutralize introducing drain water generated in the exhaust passage, sump drain water
And the surface of the drain water reservoir formed by this weir
A drain water inlet port opened more downward, below by the weir
A drain water outlet on the flow side and a gas-liquid separator having an exhaust gas outlet provided above the weir are arranged, and in the drain water passage, a drain water inlet of the drain water inlet is provided.
The neutralizing agent is located downstream portion, and the exhaust gas outlet,
It is characterized in that an exhaust gas return pipe is arranged to connect the drain water introduction part in the exhaust passage to an exhaust port provided at a low pressure part.

The drain water treatment device for engine exhaust gas according to the second aspect of the present invention is connected in the middle of the exhaust passage,
By placing a disinfectant in the middle of the exhaust passage
In the middle of the drain water passage that introduces and neutralizes the drain water
Drain for collecting drain water and drain formed by this weir
A drain water inlet opening below the water surface of the water reservoir,
Provided in the middle of the weir and drain water outlet,
The second drain water storage section in which the agent is placed, and the second drain water storage section
A neutralization device with an exhaust gas outlet above the water storage
With arranging the gas-liquid separator with the exhaust gas
Lower than the outlet and the drain water inlet in the exhaust passage.
Exhaust gas return pipe that communicates with the exhaust port provided in the pressure section
It is characterized by having been placed .

According to a third aspect of the present invention, there is provided a drain water treatment apparatus for exhaust gas in an engine exhaust gas, wherein the drain water passage has the drain water passage.
The drain water generated in the air passage is guided to the drain water inlet.
1 From the cross-sectional area of the drain water passage, the exhaust gas return pipe
The feature is that the passage cross-sectional area of is increased .

[0010]

According to the invention described in claim 1, even if the exhaust gas enters, the exhaust gas is separated by the gas-liquid separator and returned to the exhaust pipe, so that the exhaust gas can be discharged from the drain water discharge port. Disappear. Therefore, in the middle of the drain water passage to the drain water discharge port, it is possible to reduce the amount of the acidic gas component in the gas state dissolved in the drain water.

According to the second aspect of the present invention, the drain water storage section in which the neutralizing agent is arranged can also serve as the gas-liquid separator, and the number of parts can be reduced.

In the invention according to claim 3, the first drain water passage
The cross-sectional area of the exhaust gas return pipe is larger than the cross-sectional area of the passage.
Because it worked, exhaust gas can be returned to the exhaust passage,
Gas-liquid separation is reliably performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drain water treatment apparatus for engine exhaust gas according to the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of a drain water treatment apparatus for engine exhaust gas, and FIG. 1 shows a case where an engine-driven heat pump apparatus equipped with a drain water treatment apparatus for engine exhaust gas is used as an air conditioner. System diagram, FIG. 2 is a schematic configuration diagram of the first unit, FIG. 3 is a sectional view showing a connection between an exhaust heat exchanger and an exhaust silencer, and FIG. 4 is a state in which a lid of a drain water treatment device in engine exhaust gas is opened. FIG. 5 is a plan view of FIG.
6 is a sectional view taken along line V, and FIG. 6 is a sectional view taken along line VI-VI in FIG.

In FIG. 1, the system when the engine driving heat pump device is used as an air conditioner is composed of an outdoor unit I and an indoor unit II.

An engine 1 driven by a gas fuel such as city gas or propane gas is started by a starting motor 2. The engine 1 drives a compressor 3, and the driving of the compressor 3 compresses a refrigerant such as chlorofluorocarbon into a high-temperature and high-pressure gas.

A four-way switching valve 6 is connected between the discharge pipe 4 and the suction pipe 5 of the compressor 3, and pipes 7 and 8 extending from the four-way switching valve 6 have a fan on one pipe 7 side. An outdoor heat exchanger 10 provided with 9 is connected, and an indoor heat exchanger 12 provided with a fan 11 is connected to the other pipe 8 side. In addition, a pipe 13 extending from the outdoor heat exchanger 10,
An expansion valve 15 for heating, an expansion valve 16 for cooling, and check valves 17, 1 are provided between the indoor heat exchanger 12 and the pipe 14.
8, a receiver 19 and the like are provided.

In the refrigerant circulation circuit, the four-way switching valve 6
When the refrigerant is switched to circulate in the direction of the solid line arrow, the outdoor heat exchanger 10 acts as an evaporator, while the indoor heat exchanger 12 acts as a condenser to form a heating circuit for heating the room. Further, when the four-way switching valve 6 is switched so as to circulate the refrigerant in the direction of the broken line arrow, the outdoor heat exchanger 10 acts as a condenser contrary to the above,
The indoor heat exchanger 12 acts as an evaporator and serves as a cooling circuit for cooling the room.

The engine 1 has a heat exchange part 21 for cooling cylinders and the like, and a heat exchange part 23 in an exhaust heat exchanger 22 as well.
The engine cooling water is forcedly circulated by the pump 20 in the heat exchange portions 21 and 23. The exhaust heat exchanger 22 is the first exhaust pipe 8 of the engine 1.
The pipe 24 connected to the No. 3 and extending from the heat exchange section 23
Is connected to the pipe 25 and the pipe 2 via the solenoid valves 27 and 28 on the way.
6, an outdoor heat exchanger (radiator) 29 for hot water provided in parallel with the outdoor heat exchanger 10 is connected to one pipe 25, and the indoor heat exchanger 1 is connected to the other pipe 26.
The indoor heat exchanger 30 for hot water provided in parallel with 2 is connected. In this warm water indoor heat exchanger 30, engine cooling water is forcedly circulated by the pump 20 and the pump 32, and is used for indoor heating. Pump 32 is pump 2
It may be provided when the capacity of 0 is insufficient, and is not necessarily provided if the capacity of the pump 20 alone is sufficient. Three
3 is a reserve tank for engine cooling water.

A neutralizer 50 is connected to the exhaust heat exchanger 22 via a drain water passage 35, and drain water and exhaust gas flow into the neutralizer 50 from the drain water passage 35 from the exhaust heat exchanger 22. . A drain water discharge passage 69 is connected to the neutralization device 50.

The exhaust heat exchanger 22 has a second exhaust pipe 8
Exhaust silencer 52a of the exhaust treatment device 52 via
Are connected, and the exhaust silencer 52a and the mist separator 52b are integrally formed. A drain water passage 38 and an exhaust gas return pipe 70 are connected between the mist separator 52b of the exhaust treatment device 52 and the neutralization device 50.

The exhaust gas of the engine 1 is used as the exhaust heat exchanger 2.
2, exhaust silencer 52a, mist separator 52b
Is exhausted to the atmosphere. The drain water generated in the exhaust heat exchanger 22 is guided through the drain water passage 35 to the neutralization device 50 that also serves as the gas-liquid separator of the present application, and the drain water generated in the mist separator 52b passes through the drain water passage 38. It is guided to the summing device 50. The acid gas dissolved in the drain water is neutralized by the neutralizer 50, and the treated drain water is discharged from the drain water discharge passage 69.

Engine 1, compressor 3, exhaust heat exchanger 22
And the neutralizing device 50 and the like are the casing 8 of the outdoor unit I.
0 inside, and as shown in FIG.
0 is installed on the ground 81. The engine 1 is installed in the lower part of the casing 80, and a pair of compressors 3 is installed in the vicinity of the side of the engine 1.

An air cleaner 82 is provided at the intake port of the engine 1.
The exhaust heat exchanger 22 is connected to the first exhaust pipe 83 of the engine 1, and the second exhaust pipe 84 connected to the exhaust heat exchanger 22 extends upward. An exhaust silencer 52a is connected to the second exhaust pipe 84, and a mist separator 52b is connected above the exhaust silencer 52a. The exhaust treatment device 52 configured by the exhaust silencer 52a and the mist separator 52b is located at the uppermost part in the casing 80, and
The third exhaust pipe 85 connected to b penetrates the ceiling plate of the casing 80 and opens to the outside of the casing 80.

At the lower part of the outdoor unit I, there is a neutralization device 50.
The neutralizer 50 and the mist separator 52 are arranged.
b and the drain water passage 38 and the exhaust gas return pipe 7
0 is connected. A drain water discharge passage 69 is connected to the neutralizer 50, and an outlet 69b of an exhaust hose 69a connected to the drain water discharge passage 69 is located below the neutralizer 50. Further, a spare drain water discharge passage 86 is connected to the neutralizer 50, and an outlet 86 a of the spare drain water discharge passage 86 has an exhaust gas return pipe 7 in the neutralizer 50.
It is located below the 0 inlet or above the neutralizer 50.

Next, the exhaust heat exchanger 22 and the exhaust treatment device 52 will be described in detail with reference to FIG. The exhaust heat exchanger 22 is formed in a cylindrical shape, and the exhaust heat exchanger 22 is attached to the upper portion of the engine 1 with an angle θ inclined and the entire body inclined. Inside the exhaust heat exchanger 22,
The heat exchange section 23 is arranged. A cooling water supply chamber 232 and a hot water discharge chamber 233 are formed by partition walls 230 and 231 on both sides inside the exhaust heat exchanger 22, and the cooling water supply chamber 232 and the hot water discharge chamber 233 are connected by a communication pipe 234. ing. In the heat exchange section 23, engine cooling water is introduced into the cooling water supply chamber 232 through the lower inlet 235,
The engine cooling water is guided to the warm water discharge chamber 233 by the communication pipe 234 and discharged from the upper discharge chamber 233 through the outlet 236.

The internal space of the exhaust heat exchanger 22 has a large number of cold spaces.
A cooling fin 237 is provided by being inserted into the communication pipe 234,
Multi-layer small gap 238 partitioned by cooling fins 237
Are formed. The cooling fin 237 has a communication hole 23.
7a is formed, and the communication hole 237a sandwiches the small gap 238.
Therefore, the opening positions of the cooling fins 237 adjacent to each other are
Differently, when one is on the bottom, the other is on the top.
And the small gaps 238 arranged in multiple layers form a zigzag flow path.
It is designed to be completed. Also, on the cooling fins 237
A drain road 239 is provided at the lower end, and further down the slope
The drain water passage 35 is connected to the end position, and the cooling fin surface is
Surface, water vapor condenses into drain water and exhaust gas is in
It flows into the summing device 50. In addition, drain water contains exhaust gas
NO in x or SOx gas or due to these
The acid component vapor dissolves in the drain water,
It becomes sex. Also, exhaust gas enters the drain water passage 35.
However, it may enter the neutralization device 50 together with the drain water.
is there.

An inlet 240 is formed in the upper part of the slope of the internal space of the exhaust heat exchanger 22, and exhaust gas flows into the supply port 240 from the first exhaust pipe 83 and flows into the slope upstream of the heat exchange section 23. The exhaust gas thus expanded expands in the upstream portion of this inclination, and then, while passing through the communication holes 237a of the larger number of cooling fins 237 and the small gaps 238 of multiple layers in a zigzag shape, the exhaust gas exchanges heat with the cooling fins 237 and is further inclined. Exit 2 from downstream
Exhausted through 41. At this time, the sound is muted. The exhaust gas flows from the outlet 241 of the exhaust heat exchanger 22 into the exhaust treatment device 52 via the second exhaust pipe 84.

The exhaust treatment device 52 integrates a lower housing 520 and an upper housing 521 made of aluminum casting, and the lower housing 520 has an exhaust gas inlet 520.
a and the drain water outlet 520b are formed, the upper housing 5
An exhaust gas outlet 521a and an exhaust port 521b are formed at 21. Lower housing 520 and upper housing 521
Of the communication passages 522a, 522b. 522c and exhaust gas inlet 520a
A partition wall 522 having a silencing tubular wall 522d and a silencing tubular wall 522f, and a communication passage 523a,
Partition wall 523 having 523b and communication paths 524a, 524
24b, the silencing cylindrical wall 524 facing the communication passage 522b.
A partition wall 524 having c is provided by press fitting. The communication passage 522b of the partition wall 522 is inserted into the partition wall 523, and one end of the communication passage 522c of the partition wall 522 is communicated with the outlet 520b of the lower housing 520. Partition wall 5
The 24 communication passages 524a are inserted into the partition wall 523, the communication passages 524b are inserted into the partition wall 523, and are inserted into the other end of the communication passages 522c of the partition wall 522.

A third exhaust pipe 85 is connected to the outlet 521a of the upper housing 521, a cover 525 is provided on the upper portion of the third exhaust pipe 85, and an exhaust gas return pipe 70 is connected to the exhaust port 521b. ing.

As described above, the exhaust silencer 52 is formed by the lower housing 520 and the partition walls 522, 523, 524.
a is formed, and the upper housing 521 and the partition wall 524 are formed.
The mist separator 52b is formed by. Exhaust gas is supplied from the second exhaust pipe 84 to the compartment 526 of the exhaust silencer 52a via the exhaust gas inlet 520a of the lower housing 520, and from this compartment 526, the communication passage 5 is formed.
It is supplied to the compartment 528 via 22b, and further supplied to the compartment 527 from the communication passage 523a. Compartment 527
The exhaust gas supplied to the mist separator 52b is supplied to the compartment 529 of the mist separator 52b through the communication passage 524a. The communication passages 522b, 523a, 524a are exhaust gas passages. In the communication passage 523b, the exhaust gas is expanded and cooled in the compartment 528, the water vapor component in the exhaust gas is condensed, and the mist further grows. Drain water that has accumulated in the lower part of the compartment 528 passes through this and drops into the compartment 527.

Similarly, a compartment 527 is passed through the communication passage 522a.
Drain water collected in the lower part of the partition chamber 526 drops into the partition chamber 526, and the drain water collected in the partition chamber 526 reaches the exhaust heat exchanger 22 through the second exhaust pipe 84 and the drain water passage 35. Flow down to the neutralizer 50.

Exhaust gas from the compartment 529 of the mist separator 52b flows out of the third exhaust pipe 85 via the outlet 521a. The mist generated in the compartment 529 becomes drain water and accumulates in the lower part. This drain water is
It flows out from the communication passage 524b at the bottom portion formed in 1. and is guided from the communication passages 522c and 520b to the neutralization device 50 through the drain water passage 38.

Next, the neutralizer 50 is constructed as shown in FIGS. A lid 501 made of synthetic resin is fastened and fixed to a case 500 made of synthetic resin of the neutralizer 50 by screws 502, and a partition wall 500a,
Compartments 503, 504, 505 are formed by 500b, and passage walls 500c, 500d are formed in the compartment 504. Compartment 5 that composes this drain water storage
A neutralizing agent 507 is arranged in 04.

The partition wall 500a is provided with a punching metal 508 at a communication port 500e for communicating the partition chamber 503 and the partition chamber 504, and the partition wall 500b is provided with a partition chamber 5.
A punching metal 509 is provided at a communication port 500f that connects the communication chamber 04 and the compartment 505. The punching metals 508 and 509 are provided with a number of small holes below the surface of the drain water . Drain water in the small chamber 503b and
Exhaust gas that was not dissolved in drain water is
Ru enter the compartment 504 through a plurality of small holes Le 508.
Dissolution of acidic components by the neutralizing agent 507 in this compartment 504
The drain water is neutralized, the exhaust gas not dissolved wards
The exhaust gas return pipe 7 is opened from the opening 50 lc in the upper part of the drawing room 504.
It is returned to the mist separator 52b having a lower pressure than the connection portion of the exhaust heat exchanger 22 with the drain water passage 35 through 0.

The neutralizing agent in the compartment 504 dissolves the acidic component.
The drain water that has been dissolved is neutralized , and this neutralized drain water is guided from the compartment 504 to the compartment 505 through the small holes of the punching metal 509 arranged at the communication port 500f. A plug member 510 is arranged in the compartment 505. In the stopper member 510, the drain water opening 510a and the case 5 are provided.
A small chamber 510b is formed, which is closed except for the communicating portions with the outlets 500h and 500i formed in No. 00. Compartment 5
The drain water in 05 enters the small chamber 510b through the opening 510a which is the drain water discharge port referred to in the present application, and is guided and discharged into the outlet 500h beyond the lowest portion 510c of the communicating portion between the outlet 500h and the small chamber 510b.

It is also possible to provide at least one small hole of the punching metal 508, 509 above the lowermost portion 510c. In this case, the drain water level of the compartments 503 and 504 is also maintained at the water level determined by the lowest portion 510c. A spare drain water discharge passage 86 is connected to the outlet 500i, and the outlet 86a is discharged at almost the height of the upper end of the neutralizer 50.

The lid 501 has an inlet 501a, which is the drain water inlet of the present application, at a position facing the small chamber 503a defined by the weir wall 500g of the compartment 503, and an inlet 501b at a position facing the small chamber 503b of the compartment 503. Further, an opening 501c is formed at a position facing the compartment 504. The drain water passage 3 of the exhaust heat exchanger 22 is provided at the inlet 501a.
5 is connected and the drain water is supplied to the small chamber 503b of the compartment 503.
Guide inside. Further, the mist separator 5 is provided at the inlet 501b.
The drain water passage 38 of 2b is connected, and a long rubber tube 512 is connected to the position of the inlet 501b in the lid 501 to guide the drain water into the small chamber 503b of the compartment 503. The exhaust gas return pipe 70 is connected to the opening 501c that is the exhaust gas outlet in the present application, and the exhaust gas is sent from the opening 501c to the mist separator 52b via the exhaust gas return pipe 70.
That is, the drain water from the exhaust heat exchanger 22 is the rubber pipe 5
The small chamber 503a enters from the tip of 12 and the small chamber 503a
, And it enters the small chamber 503b over the weir wall 500g. Exhaust gas that enters with the drain water is also 5
Drain water storage part of the small chamber 503a formed by 00g
From the tip of the rubber pipe 512 below the water surface of the small chamber 50
3a, and the acidic gas in the exhaust gas enters the small chamber 503a.
Dissolved in the drain water that collects
The exhaust gas that has not been understood passes over the weir wall 500g and enters the small chamber 503b . Drain water and drain of small chamber 503b
Exhaust gas that did not dissolve in water was punched metal 50
Ru enter the compartment 504 through a plurality of small holes 8. This ward
The drawing room 504 serves as a second drain water storage section and is used for neutralization.
The drain water in which the acidic component is dissolved is neutralized by the agent 507.
Then, the undissolved exhaust gas passes through the exhaust gas return pipe 70 from the opening 50lc in the upper part of the compartment 504 and passes through the mist separation.
Ru return to the over data 52b.

As described above, the drain water and the exhaust gas flow into the neutralization device 50 from the drain water passage 35 from the exhaust heat exchanger 22. Since the opening 501c of the exhaust gas return pipe 70 is formed above the surface of the drain water of the neutralizer 50, the neutralizing agent 507 causes an acidic component to be generated in the neutralizer 50.
Exhaust gas that did not dissolve due to the neutralized drain water of
Exhaust gas returns from the upper opening 50 lc of the compartment 504.
After passing through the drain pipe 70, it is returned from the discharge port 521b into the mist separator 52b at the downstream portion of the exhaust silencer 52a having a lower pressure than the drain water introduction part.

Since the mist separator 52b is located downstream of the exhaust heat exchanger 22 and the pressure is reduced by the exhaust silencer 52a on the way, the exhaust heat exchanger 22 is prevented.
Pressure P1 of the exhaust mist separator 52b is higher than the pressure P2 of the mist separator 52b.
Since the internal pressure of the neutralization device 50 to which the pressure of 2 is introduced becomes higher than that in the mist separator 52b, the exhaust gas separated in the neutralization device 50 surely flows through the exhaust gas return pipe 70 toward the mist separator 52b. .

The drain water passage 38 connected to the lower part of the mist separator 52b is connected to the inlet 501b of the neutralizer 50, and the long rubber pipe 5 connected to the inlet 501b.
Since the 12 openings are provided below the surface of the drain water, when the internal pressure of the small chamber 503b of the neutralization device 50 becomes high, the surface of the drain water in the drain water passage 38 rises and balances.
That is, the drain water or the exhaust gas in the neutralization device 50 does not flow back through the drain water passage 38. Therefore,
Drain water from the mist separator 52b is neutralized by gravity 5
Lead to zero.

Since the neutralization device 50 is provided with a small chamber 510b which is guided below the surface of the drain water into the compartment 505 through the communication port 500f and further from the compartment 505 to the outlet 500h formed in the case 500, exhaust air is provided. The gas does not enter the drain water discharge passage 69.

The neutralizing agent 507 provided in the compartment 504 of the neutralizing apparatus 50 undergoes a neutralization reaction with the acid dissolved in the drain water under the surface of the drain water, and is consumed as a dissolved salt. When it is consumed, the drain water above the surface is replenished.

The neutralizer 50, the drain water passage 35 from the exhaust heat converter 22, and the drain water passage 38 from the mist separator 52b are all arranged inside the outdoor unit I, and are located in a high temperature atmosphere. .

The outlet 86a of the preliminary drain water discharge passage 86 connected to the outlet 500i of the neutralizer 50 is discharged at almost the height of the upper end of the neutralizer 50, and the drain water discharge passage 69 is at the highest position. The spare drain water discharge passage 86 is opened further upward and serves as a spare discharge passage when the drain water discharge passage 69 is clogged. When the preliminary drain water discharge passage 86 functions, the surface of the drain water in the neutralization device 50 rises, but the exhaust gas entering from the drain water passage 35 enters the compartment 504 and the compartment 505. Mist separator 5 from above via exhaust gas return pipe 70
Return to 2b.

Since the drain water passages 35, 38 and the exhaust gas return pipe 70 are separated, the exhaust gas can be surely returned. In this embodiment, the drain water passage 3
It is possible to make the cross-sectional area of 8 larger than the cross-sectional area of the drain water passage 35, but in this embodiment, the common cross-section is used to make the parts common. The sum of the cross-sectional area of the drain water passage 38 and the cross-sectional area of the exhaust gas return pipe 70 is larger than the cross-sectional area of the drain water passage 35, which also ensures the return of the exhaust gas. It Further, the exhaust gas return pipe 70 is connected to the mist separator 52b, and is connected downstream of the exhaust silencer 52a, so that the exhaust gas return effect is high. As can be seen from the above, the neutralization device 50 also serves as the gas-liquid separator referred to in the present application.

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

7 and 8 show another embodiment of the drain water treatment apparatus for engine exhaust gas, FIG. 7 is a system diagram of the drain water treatment apparatus for engine exhaust gas, and FIG. It is a figure which shows the connection with a liquid separator.

In this embodiment, the members designated by the same reference numerals as those in FIGS. 1 to 6 have the same structure, and therefore detailed description thereof will be omitted.

In this embodiment, the gas-liquid separator 200 is arranged separately from the neutralizing device 50, and the gas-liquid separator 200 is
Drain water and exhaust gas from the exhaust heat exchanger 22 flow in via the drain water passage 35, drain water and exhaust gas from the exhaust silencer 52a flow in via the drain water passage 201, and drain from the mist separator 52b. Water and exhaust gas flow in via the drain water passage 38. The exhaust gas separated in the gas-liquid separator 200 flows through the exhaust gas return pipe 70 toward the mist separator 52b.

A weir 200a is provided in the gas-liquid separator 200, and the drain water overflowing the weir 200a flows into the neutralizer 50. A drain passage is formed by the partition plates 202 and 203 in the neutralization device 50, and a neutralizing agent 204 is provided between the partition plates 202 and 203. Drain water overflows from the partition plate 203 and is discharged from the drain water discharge passage 69.

In this way, the plurality of drain water passages 35, 2
01, 38 are provided, and each drain water passage 35, 201, 38
Are all opened below the surface of the drain water of the gas-liquid separator 200, and the pressure P1 of the drain water passage 35 and the drain water passage 20
1 pressure P2, drain water passage 38 and exhaust gas return pipe 7
When the pressure P3 is 0, P3 <P2 <P1 is set. Since the pressure P1 of the drain water passage 35 is higher than the pressure P3 of the exhaust gas return pipe 70, the exhaust gas is returned to the exhaust gas return pipe 70.

Further, the depth of the opening from the water surface is set according to the position of the drain water outlet from the upper end to the downstream of the exhaust passage 205 formed by the weir 200a of the gas-liquid separator 200. In this embodiment, the distance Δ between the opening of the drain water passage 35 and the opening of the drain water passage 201.
H1 and the drain water passage 35 opening and the drain water passage 38
The distance ΔH2 from the opening is set to be deeper as it corresponds to the downstream of the exhaust passage 205. That is, the depth corresponding to the pressure difference,

[0059]

[Formula 1] Is set to be

As a result, the drain water passages 35, 201,
Since all the exhaust gas passing through 38 contacts the drain water,
Acid gas dissolves in drain water more efficiently and is neutralized. Further, since the gas-liquid separator 200 is arranged upstream of the neutralizer 50 to separate the exhaust gas, at least the acid dissolved in the drain water can be surely neutralized.

A gas-liquid separator may be arranged downstream of the neutralizer 50. Further, the drain water passages 201, 38 or the exhaust gas return pipe 70 corresponding to the exhaust pipe downstream side from the cross-sectional area of the drain water passage 35 corresponding to the uppermost stream of the exhaust pipe, which is the drain water in the gas-liquid separator 200. The cross-sectional area (any one cross-sectional area or the sum of a plurality of cross-sectional areas) of those that open above the water surface may be set to a large value, and the gas-liquid separation is reliably performed.

FIG . 9 is a system diagram showing a fourth embodiment of the drain water treatment apparatus in the engine exhaust gas.

In this embodiment, the members designated by the same reference numerals as those in FIGS. 1 to 6 have the same structure, and thus detailed description thereof will be omitted.

In this embodiment, drain water and exhaust gas from the exhaust heat exchanger 22 flow into the neutralizer 50 through the drain water passage 300, and the separated exhaust gas from the neutralizer 50 is exhaust gas. It is returned to the first exhaust pipe 83 via the return pipe 301. That is, the outlet pressure P2 of the exhaust gas return pipe 301 is set to be lower than the inlet pressure P1 of the drain water passage 300 by using the dynamic pressure. That is, since the dynamic pressure acts on the pressure P1 at the inlet of the drain water passage 300, P1> P2, and the drain water efficiently flows into the neutralization device 50 together with the exhaust gas. This increases the degree of freedom in the installation positions of the inlet of the drain water passage 300 and the outlet of the exhaust gas return pipe 301.

FIG . 10 is a view showing a connecting portion of an outlet of an exhaust gas return pipe showing a fifth embodiment of the drain water treatment apparatus in the engine exhaust gas. This embodiment has the same structure as that of FIG. 9 , but the outlet of the exhaust gas return pipe 301 is connected to the venturi section 3.
02, the outlet pressure P of the exhaust gas return pipe 301
2 is lower than the pressure P1 at the inlet of the drain water passage 300. In this way, the outlet pressure P2 of the exhaust gas return pipe 301 is made lower than the pressure P1 of the inlet of the drain water passage 300, so that the pressure drop action by the venturi action is used. As a result, the drain water passage 3
The degree of freedom of the installation position of the introduction port of 00 and the installation position of the exit of the exhaust gas return pipe 301 is increased.

[0066]

[0067]

[0068]

As described above, according to the first aspect of the present invention, even if the exhaust gas enters, the exhaust gas is separated by the gas-liquid separator and returned to the exhaust pipe. Since the gas is not discharged, it is possible to reduce the amount of the acidic gas component in the gas state dissolved in the drain water in the middle of the drain water passage to the drain water discharge port.

According to the second aspect of the invention, the drain water storage portion in which the neutralizing agent is arranged can also serve as the gas-liquid separator, and the number of parts can be reduced.

In the third aspect of the invention, the first drain water passage
The cross-sectional area of the exhaust gas return pipe is larger than the cross-sectional area of the passage.
Because it worked, exhaust gas can be returned to the exhaust passage,
Gas-liquid separation is reliably performed.

[Brief description of drawings]

FIG. 1 is a system diagram when an engine-driven heat pump device including a drain water treatment device in engine exhaust gas is used as an air conditioner.

FIG. 2 is a schematic configuration diagram of a first unit.

FIG. 3 is a cross-sectional view showing a connection between an exhaust heat exchanger and an exhaust silencer.

FIG. 4 is a plan view of the drain water treatment device in the engine exhaust gas with the lid open.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a cross-sectional view taken along the line VI-VI of FIG.

[Fig. 7] System of drain water treatment device in engine exhaust gas
It is a system diagram.

FIG. 8 is a diagram showing a connection between a neutralizer and a gas-liquid separator.
It

FIG. 9 is a system of a drain water treatment device in engine exhaust gas .
It is a system diagram.

FIG. 10: Exhaust of drain water treatment device in engine exhaust gas
It is a figure which shows the connection part of the exit of a gas-gas return pipe.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F01N 7/00

Claims (3)

(57) [Claims] 1. A connected to the middle of the exhaust passage, by placing in the middle of a neutralizing agent, in the middle of the drain water passage to neutralize introducing drain water generated in the exhaust passage, weirs for storing drain water And the drain formed by this weir
A drain water inlet opening below the water surface of the water storage section ,
Drain water outlet on the downstream side by the weir and above the weir
A gas-liquid separator having an exhaust gas outlet provided on one side, and in the drain water passage, downstream of the drain water inlet.
Part of the neutralizing agent disposed in communication with said exhaust gas outlet, and a discharge port provided in the low pressure portion from the drain water introducing portion of the exhaust passage exhaust
A drain water treatment device in engine exhaust gas, characterized in that a gas return pipe is arranged. 2. A neutralizer is connected midway in the exhaust passage.
Drainage generated in the exhaust passage
In the middle of the drain water passage for introducing and neutralizing water, a weir for collecting drain water and a drain formed by this weir
A drain water inlet opening below the water surface of the water reservoir,
Provided in the middle of the weir and drain water outlet,
The second drain water storage section in which the agent is placed, and the second drain water storage section
A neutralization device with an exhaust gas outlet above the water storage
A gas-liquid separator having an exhaust gas outlet and the drain water in the exhaust passage.
Exhaust gas that communicates from the introduction part to the discharge port provided in the low pressure part
Engine exhaust gas characterized by a gas return pipe
Drain water treatment device in storage. 3. Drain water generated in the exhaust passage of the drain water passage is supplied to the drain water inlet.
From the passage cross-sectional area of the leading first drain water passage, the exhaust gas
The drain water treatment device for engine exhaust gas according to claim 1, wherein a passage cross-sectional area of the return pipe is increased .