JP2722161B2 - Automatic removal device for adhering soot in the heat exchanger for exhaust heat recovery of the exhaust heat recovery device of the engine heat pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery device for an engine heat pump, and
Soot and oil sludge in engine exhaust gas adhere and accumulate
The heat exchange efficiency of the exhaust heat recovery heat exchanger.
When lowered, this deposited soot and oil sludge
And a device for automatically removing the same.

[0002]

2. Description of the Related Art As an exhaust heat recovery apparatus for an engine heat pump, there is a prior art apparatus as shown in FIG. That is, the muffler (4), the flexible hose (5), and the exhaust pipe (6) are sequentially connected to the exhaust port (2) of the engine (1) via the exhaust heat recovery heat exchanger (3).

[0003] The cooling water of the engine (1) is pumped by the pump (29).
Engine (1) water jacket (20), heat for exhaust heat recovery
Circulate through the heat exchanger (3) and the hot water heat exchanger (23)
The cooling water of the engine (1) is a water jacket
(20) Absorb heat of engine (1) and heat exchange for exhaust heat recovery
The heat of the engine exhaust gas passing through here is absorbed by the vessel (3)
Then, heat is dissipated by the hot water heat exchanger (23). D
The refrigerant compressor (7) of the air conditioner (8) is linked to the engine (1).
The cooling and heating device (8) is connected to a refrigerant compressor (7)
Circulate through the indoor unit (8a) and the outdoor unit (8b), and
It is designed to cool and heat the interior of the building. So
Engine oil soot and oil sludge (hereinafter referred to as
Bottom, soot etc.) on the inner surface of the heat exchanger for exhaust heat recovery (3)
This exhaust heat recovery heat exchanger is deposited and deposited.
When the heat exchange efficiency of (3) was reduced,
There was no device for automatically removing soot and the like.

[0004] Incidentally, the exhaust heat recovery heat exchanger噐(3),
For example, as shown in FIG.
(0) and the engine cooling water passage
And a casing (3b) forming (31). This heat exchange element (3a) has a large number of fins (3
A plurality of flat oblong unit elements formed with c) are stacked one above the other at appropriate intervals, and both ends of each unit element are communicated with each other at communication portions (3d) and (3e), and a communication portion at one end is formed.
(3d) is connected to an exhaust port (2) of the engine (1) to serve as an exhaust gas inlet, and a communication portion (3e) at the other end is connected to an exhaust gas outlet (32) communicating with a muffler (4). Connected.

[0005]

The above prior art has the following problems. (I). Exhaust heat recovery heat exchanger (3) is deposited with soot
When the heat exchange efficiency decreases, the deposits such as soot
The operating time of the engine (1) that cannot be removed automatically becomes longer
The more the combustion in the combustion chamber of the engine,
And soot and the like are generated. This soot is mixed with the exhaust gas.
When passing through the heat exchanger for exhaust heat recovery (3)
Adhered to and deposited on the inner surface of the exhaust heat recovery heat exchanger (3)
To go. This adhesion and deposition of soot etc. may
In the case of low speed / low load than in the case of high speed / high load,
The deposition of soot etc. on the heat exchanger for exhaust heat recovery (3) has progressed.
Easy to see. The reason is that the lower the speed and the lower the load, the more the combustion
Instability increases soot generation and exhaust
Since the amount of gas is small and the exhaust gas flow rate is slow, soot etc.
Because it is hard to be washed away.

[0006] Soot and the like are allowable in the heat exchanger (3) for exhaust heat recovery.
When adhering and accumulating as described above, the adhering and accumulating layers such as soot are insulated
Layer to improve the heat exchange efficiency between exhaust gas and engine cooling water.
Extremely lower to reduce the heat recovery efficiency of exhaust heat.
In order to recover the heat recovery efficiency of this exhaust heat, the exhaust heat
If the soot and the like deposited and removed from the recovery heat exchanger (3) are removed
Good. In the above prior art, a means for removing the soot and the like is used.
And could not be performed automatically, relying on manual labor.
It takes time to check the amount of deposits and remove soot etc.
The work cost is high.

(B). Checking and removing the amount of soot and other deposits
The engine heat pump must be shut down during departure
During the confirmation work and removing work of adhesion deposition amount of such become not soot,
Exhaust heat recovery heat exchanger (3) must be removed
The engine heat pump must be shut down
Absent. An object of the present invention is to provide (a) a heat exchanger for exhaust heat recovery.
When the heat exchange efficiency decreases due to the deposition of soot,
To automatically remove attached deposits such as
And (b) Checking and removing the amount of deposited soot etc.
Can continue to operate the engine heat pump without trouble
There is something to do.

[0008]

According to the present invention, the following conventional structure is added to the above-mentioned prior art in order to achieve the above-mentioned object, as shown in FIGS. 1 and 2, for example. A temperature sensor for detecting the exhaust gas outlet temperature is attached to the muffler (4).
The temperature sensor (9) is provided with an operation control device (11).
Connected to the input side of the operation control device (11), and
Connect some cooling fans (8c) of the number of outdoor units (8b)
And, the operation control device (11) is input from the temperature sensor (9)
The detected value of the exhaust gas outlet temperature (T1)
Fan stop command signal when the temperature reaches the operating temperature range (T0).
Signal, and is below the lower limit of this forced operation temperature range (T0).
Output fan stop release command signal
Configured as

The exhaust gas outlet temperature detected by the temperature sensor (9)
The detected value of degree (T1) has reached the forced operation temperature range (T0)
In this case, the operation control device (11) outputs a fan stop command signal.
And force actuated to stop the part of the cooling fan (8c), temperature
Detection of exhaust gas outlet temperature (T1) detected by temperature sensor (9)
Value forced operating temperature area (T0) the lower limit of this region from the following
If it goes down, the operation control unit (11) stops the fan.
A release command signal is output to turn on some of the cooling fans (8C).
That the system was configured to release the
Features.

[0010]

The present invention operates as follows. (A). If the amount of soot and other deposits is below the allowable limit, the engine heat pump is
The exhaust gas of (1) is radiated by the heat exchanger for exhaust heat recovery (3).
It cools down by a certain amount and becomes low temperature. Heat exchange for exhaust heat recovery
When the amount of soot or the like deposited on the vessel (3) is below the allowable limit
, The exhaust gas is cooled well by the heat exchanger for exhaust heat recovery (3)
And the temperature is lower than the forced operation temperature range (T0).
You.

(B). Adhesion / deposition amount of soot is allowable limit
Huh adhesion amount and accumulation of such soot to the case exceeds the exhaust heat recovery heat exchanger (3)
Exhaust gas will be exhaust heat recovery heat exchanger
(3) It is difficult to cool down due to the decrease in heat exchange efficiency,
The temperature rises to within the braking operation temperature range (T0). This forced operation
The temperature sensor (9) detects the temperature that has risen to the temperature range (T0).
The operation control device (11) stops the fan
A plurality of outdoor units of the cooling and heating device (8) by outputting a stop command signal.
The operation of some of the cooling fans (8C) in (8b) is stopped.

Then, some of the cooling fans (8C) stop operating.
The heat exchange amount of the outdoor unit (8b) as a whole decreases
The indoor unit (8a) begins to run out of
You. Based on this, the well-known automatic
Cooling and heating inside the building with the indoor unit (8a) by the operation of the control device
Attempts to automatically control the temperature to the set temperature. That is, cold
Increase the rotation speed of the medium compressor (7) to increase the amount of refrigerant circulated.
This compensates for the decrease in the heat exchange amount of the outdoor unit (8b) as a whole. This
As a result, the indoor air-conditioning temperature of the building in the indoor unit (8a) is set.
Keep at constant temperature.

(C). Automatic removal of soot and the like deposited and deposited At this time, a well-known automatic control device for the engine heat pump
In order to increase the rotation speed of the refrigerant compressor (7),
The load on the engine (1) increases and the fuel supply increases.
And the operating state of the engine (1) becomes high speed and high load,
The amount of exhaust gas increases and the exhaust gas flow velocity increases. this
High-speed exhaust gas flows from the heat exchanger for exhaust heat recovery (3).
Soot and the like adhering to and accumulating on the surface are blown off and automatically removed.
Exhaust heat recovery heat exchanger (3) is based on soot deposited
Elimination of heat insulation layer, recovery of heat exchange efficiency, recovery of exhaust heat
The exhaust heat recovery efficiency of the device recovers.

(D). For low speed and low load operation of the engine
When the heat exchange efficiency of the heat exchanger for returning exhaust heat recovery (3) recovers,
The exhaust gas of the engine (1) is a heat exchanger for exhaust heat recovery (3)
Well cooled and lower than the forced operation temperature range (T0)
become. The temperature becomes lower than this forced operation temperature range (T0).
Operation based on the fact that the temperature sensor (9) detects that
The control device (11) outputs a fan stop release command signal to
Shut down some cooling fans (8C) of the number of outdoor units (8b).
Release what was stopped and operate.

Then, the heat exchange amount of the outdoor unit (8b) as a whole
And the indoor unit (8a) has excessive cooling and heating
Start to become. Based on this, the circumference of the engine heat pump
The intelligent automatic control device allows the indoor unit (8a) to
Attempts to automatically control the air-conditioning temperature to the set temperature. sand
In other words, the rotational speed of the refrigerant compressor (7) is reduced so that the refrigerant circulates.
Reduce the amount of heat and increase the amount of heat exchange of the outdoor unit (8b) as a whole
Reduce minutes. This allows the indoor unit (8a)
Is maintained at the set temperature. At this time,
The operation of the well-known automatic control unit of the heat pump
In order to reduce the rotation speed of the compressor (7), the engine (1)
The load is reduced, the fuel supply is reduced and the engine
The operation state of (1) becomes low speed and low load.

[0016]

The present invention is constructed and operated as described above, and has the following effects. (I). Exhaust heat recovery heat exchanger (3) is deposited with soot
When the heat exchange efficiency decreases, the deposits such as soot
Soot etc. to the exhaust heat recovery heat exchanger (3) which is automatically removed
If the amount of deposition exceeds the allowable limit, the exhaust gas will be exhausted.
Cooled due to lower heat exchange efficiency in heat recovery heat exchanger (3)
It becomes difficult and rises to within the forced operation temperature range (T0)
You. Temperature that has risen to within this forced operation temperature range (T0)
Is detected by the temperature sensor (9).
(11) outputs a fan stop command signal,
Part of the cooling fan (8C) of the plurality of outdoor units (8b) of (8)
Is deactivated.

Then, some of the cooling fans (8C) stop operating.
The heat exchange amount of the outdoor unit (8b) as a whole decreases
The indoor unit (8a) begins to run out of
You. Based on this, the well-known automatic
Cooling and heating inside the building with the indoor unit (8a) by the operation of the control device
Attempts to automatically control the temperature to the set temperature. That is, cold
Increase the rotation speed of the medium compressor (7) to increase the amount of refrigerant circulated.
This compensates for the decrease in the heat exchange amount of the outdoor unit (8b) as a whole. This
As a result, the indoor air-conditioning temperature of the building in the indoor unit (8a) is set.
Keep at constant temperature.

At this time, a well-known engine heat pump is used.
The rotation speed of the refrigerant compressor (7) is increased by the operation of the automatic control device.
To increase the load on the engine (1)
The supply amount is increased, and the operating state of the engine (1) is high speed and high
Load, the amount of exhaust gas increases, and the exhaust gas flow speed increases.
It becomes. This high-speed exhaust gas flow is used as a heat exchanger for exhaust heat recovery.
Automatically blows off soot and other substances deposited on it from (3)
To be removed. As a result, heat exchange for exhaust heat recovery
Check and remove the amount of soot and other deposits on the heat exchanger (3)
It can be omitted, saving labor and cost of these operations.
Can be abbreviated.

(B). Adhered to heat exchanger for exhaust heat recovery (3)
Even during the automatic removal of accumulated soot, the engine
Heat pump can continue to operate properly
Automatic removal of soot adhering to the heat exchanger for exhaust heat recovery (3)
As mentioned above, the exhaust gas temperature at the muffler (4) was
Temperature rise in the forced operation temperature range (T0).
Based on the detection by the sensor (9), a part of the outdoor unit (8b)
The cooling fan (8C) is stopped and the refrigerant in the refrigerant compressor (7)
Increase the circulation amount and change the operating state of the engine (1) at high speed and high load
To increase the engine exhaust gas volume,
Soot etc. deposited and deposited with high-speed exhaust gas flow are blown off vigorously
This is done by stripping.

At this time, heat exchange of the outdoor unit (8b) as a whole
Volume is reduced by stopping some cooling fans (8c).
On the other hand, increase the amount of refrigerant circulating in the refrigerant compressor (7).
It is replenished by increasing by the amount
The required amount of heat exchange is sufficiently ensured. With this, indoor
Since the required amount of heat exchange of the machine (8a) is sufficiently secured,
The air conditioning temperature of the building by the indoor unit (8a) to the set temperature.
You can keep it well.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
It will be explained. 1A is a schematic configuration diagram of an exhaust heat recovery device of an engine heat pump, FIG. 1B is a cross-sectional view of a main part of an exhaust heat recovery heat exchanger, and FIG. 2A is an operation flowchart of an operation control device. FIG. 2 (B) is a diagram showing changes in the operation time versus the exhaust outlet temperature and the exhaust pressure. In the figure, a muffler 4 is connected to an exhaust port 2 of an engine 1 via a heat exchanger 3 for exhaust heat recovery.
The flexible hose 5 and the exhaust pipe 6 are communicated in order. Further, the water jacket 20 of the engine 1 is used.
The heat receiving path 21, the hot water path 22, and the heat transfer path 23a and the cold water path 24 of the hot water heat exchanger 23 of the exhaust heat recovery heat exchanger 3.
Are sequentially connected in a circulating manner.

The exhaust heat of the exhaust gas of the engine 1 is recovered and used as engine cooling water by the heat exchanger 3 for recovering exhaust heat.
Is driven to operate the cooling / heating device 8. As shown in FIG. 1B, the heat exchanger for exhaust heat recovery 3 includes a heat exchange element 3a having an exhaust gas passage 30 therein and a casing 3b forming an engine cooling water passage 31. .

This heat exchange element 3a is formed by laminating a plurality of flat oblong unit elements having a large number of fins 3c formed in a hollow space at appropriate intervals above and below, and connecting both ends of each unit element to communicating portions 3d and 3e. To communicate with each other,
The communication part 3d at one end is connected to the exhaust port 2 of the engine 1 to serve as an exhaust gas inlet, and the communication part 3e at the other end is connected to an exhaust gas outlet 32 communicating with the muffler 4. The engine 1 is operated by supplying fuel gas from a fuel gas inlet 25 and discharges exhaust gas through a muffler 4, a flexible hose 5, and an exhaust pipe 6. or,
The engine 1 is provided with a fan 26 on its rotating shaft to air cool the outer periphery of the engine.

The heat exchanger 23 for hot water has a hot water inlet 27 and a hot water outlet 28 for hot water supply, is pumped by a cooling water pump 29, and is supplied to the water jacket 20 of the engine 1 and the heat exchanger 3 for exhaust heat recovery. The engine cooling water passing through the heat receiving path 21 absorbs the heat of the water jacket 20 and the exhaust heat of the exhaust gas, and the heat transfer path 2 of the heat exchanger 23 for hot water.
3a is discharged to the hot water supply hot water for use. The cooling / heating device 8 includes a plurality of indoor units 8a and outdoor units 8b, and switches the direction of the refrigerant pumped by the refrigerant compressor 7 with the four-way valve 7a to perform cooling or heating by each indoor unit 8a.

Further, an operation control device 1 having an exhaust gas outlet temperature detecting temperature sensor 9 at the outlet 4a of the muffler 4 and having the temperature sensor 9 provided with an abnormality alarm device 10 is provided.
1 are linked. And the operation control device 11
Is the exhaust gas outlet temperature T1 detected by the temperature sensor 9.
Accordingly, Ru configured tear to operate as follows. That is, as shown in FIG. 2, when the exhaust gas outlet temperature T1 detected by the temperature sensor 9 is lower than the forced operating temperature range T0 (for example, about 150 ° C. to 170 ° C.), the engine 1 is operated normally.

When the exhaust gas outlet temperature T1 reaches the forcible operation temperature range T0, for example, one of the plurality of outdoor units 8b of the cooling and heating device 8 is stopped. Thus, the engine 1 is forcibly operated under the pseudo load. When the exhaust gas outlet temperature T1 falls below the forced operation temperature range T0 due to the forced pseudo load operation, the engine 1 is operated normally. Further, if the exhaust gas outlet temperature T1 does not fall below the forced operation temperature range T0 even after the forced pseudo load operation is repeated a set number of times N (for example, 5 times), an abnormality alarm is issued from the abnormality alarm device 10. Send out. When the exhaust gas outlet temperature T1 is equal to or higher than the forced operation temperature range T0, the operation of the engine 1 is stopped.

The abnormal alarm transmitted from the abnormal alarm device 10 is, for example, an acoustic alarm such as a buzzer or the like, and at the same time, the number of times of the forced pseudo load operation or the remaining number of set repetitions N is visually displayed. The clogged state of the heat exchange element 3a of the exchanger 3 can be predicted.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 (A) is a schematic configuration diagram of an exhaust heat recovery device for an engine, and FIG. 1 (B) is a sectional view of a main part of an exhaust heat recovery heat exchanger.

FIGS. 2A and 2B show an embodiment of the present invention, wherein FIG. 2A is an operation flowchart of the operation control device, and FIG. 2B is a diagram showing changes in the exhaust outlet temperature and the exhaust pressure with respect to the operation time.

FIG. 3 is a diagram showing a conventional example and corresponding to FIG. 1 (A).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Exhaust port, 3 ... Exhaust heat recovery heat exchanger, 4 ... Muffler , 5 ... Flexible hose, 6 ... Exhaust pipe, 7 ... Refrigerant compressor, 8 ... Cooling / heating device, 8a ... Indoor unit, 8b ... outdoor unit, 8c ... cooling fan, 9 ...
Temperature sensor , 11 : operation control device, 20: water jacket, 23
... Heat exchanger for hot water , 29 ... Cooling water pump, T0 ... Forced operation temperature range, T1 ...
Exhaust gas outlet temperature.

Continuation of the front page (56) References JP-A-4-350474 (JP, A) JP-A-62-288438 (JP, A) JP-A-63-32252 (JP, A) JP-A-59-196002 (JP) JP-A-4-237843 (JP, A) JP-A-62-297239 (JP, U) JP-A-1-176726 (JP, U) JP-A-57-173738 (JP, U)

Claims (1)

(57) [Claims] 1. A communication muffler (4) through the engine (1) an exhaust port (2) to the exhaust heat recovery heat exchanger噐(3) of the pump the cooling water of the engine (1) (29) And the engine (1)
Water jacket (20), heat exchanger for exhaust heat recovery (3)
And circulate through the hot water heat exchanger (23).
The cooling water of the engine (1) is engineered by the water jacket (20).
The heat of the exhaust gas (1) is absorbed by the heat exchanger (3) for exhaust heat recovery.
Absorbs the heat of the engine exhaust gas passing through the
The heat is radiated by the exchanger (23), and the refrigerant compressor (7) of the air conditioner (8) is linked to the engine (1).
The cooling and heating device (8) is connected to the refrigerant compressor (7).
Circulating to the indoor unit (8a) and the outdoor unit (8b), the indoor unit (8a)
An exhaust heat recovery device for an engine heat pump configured to cool and heat the interior of a building by using the muffler (4 ) and a temperature sensor for detecting an exhaust gas outlet temperature.
(9), and the temperature sensor (9) is connected to the operation control device (11).
Connect to the input side and connect multiple
Some of the cooling fans (8c) of the outdoor units (8b) are connected, and the operation control device (11) receives an input from the temperature sensor (9).
The detected value of the exhaust gas outlet temperature (T1) is a predetermined forcible operation temperature.
The fan stop command signal when the temperature reaches the temperature range (T0).
Output to fall below the lower limit of this forced operation temperature range (T0).
Output a fan stop release command signal
And the exhaust gas outlet temperature (T1) detected by the temperature sensor (9) is detected.
If the output value reaches within the forced operating temperature range (T0),
The rotation control device (11) outputs a fan stop command signal,
A part of the cooling fan (8c) is stopped to detect the exhaust gas outlet temperature (T1) detected by the temperature sensor (9).
The output value is within the forced operation temperature range (T0) and the lower limit of this range
If the following drop occurs, the operation control device (11) stops the fan.
Output a stop release command signal, and said part of the cooling fan (8C)
Configure to operate by releasing the operation stopped, it exhaust heat times of the exhaust heat recovery system for an engine according to claim
Automatic removal device for adsorbed soot from the heat exchanger.