JP3520476B2 - Gas engine with deodorizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas engine with a deodorizing device, which uses a gas such as city gas or propane gas to which an odorant is added as a measure against gas leakage as a fuel.

[0002]

2. Description of the Related Art When a gas fuel mixed with an odorant is supplied to a gas engine, the S component in the odorant causes S in the combustion chamber.
Ox is generated, and this is combined with water vapor to cause corrosion of the combustion chamber part or corrosion of the exhaust path. Further, when SOx caused by the odorant is mixed in the blow-by gas leaking into the crank chamber, it is combined with water vapor in the blow-by gas to become an acid, which is sent to the lubrication part of each part together with the oil in the crank chamber and lubricated. There was also the problem of corroding parts.

Therefore, the applicant has filed Japanese Patent Application No. 5-56497.
Catalyst intervenes in the fuel supply passage of the gas engine according to No. 1, and the odor component (odorant) in the fuel gas is generated by this catalyst.
I have proposed to remove.

[0004]

As such a catalyst, for example, a Mn-based catalyst may be used, but the use of the catalyst reduces the odorant removal ability. Therefore, it is possible to increase the activity of the catalyst by supplying air, but this air supply does not affect the gas engine operation, and the supply of air causes mixing of fuel gas and air. Care should be taken not to change the gas flow rate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a gas engine with a deodorizing device capable of maintaining the activity of the catalyst without affecting the gas engine operation or the gas flow rate. There is.

[0006]

In order to solve the above-mentioned problems and to achieve the object , the present invention has the following constitution.
did. First aspect of the present invention, Bei example an intake system for supplying fuel gas mixed with odor gas is mixed with air, the fuel gas passage or mixing upstream from mixing section of the air and fuel gas
At least M in the intake passage from the joint to the gas engine
An n-type catalyst is arranged to detect a decrease in the activity of the catalyst, and when the activity of the catalyst is decreased, air is supplied from the intake system to the upstream of the catalyst during operation of the gas engine. A gas engine with a deodorizing device provided with a catalyst regenerating means for supplying , wherein the catalyst activity decrease detecting means is provided.
Is the predetermined cumulative operation based on the data from the cumulative operation time meter
It is configured to detect a decrease in catalyst activity over time,
Every predetermined cumulative operating time when a decrease in catalyst activity is detected
In addition to regenerating the catalyst by the catalyst regenerating means,
At least the number of Mn-based catalyst regenerations increases, the catalyst regeneration
After that, the predetermined accumulation until the decrease in the catalyst activity is detected again.
The feature is that the total operation time is set short .

According to the second aspect of the present invention, odorous gas is mixed.
Equipped with an intake system that supplies mixed fuel gas with air
There is a fuel gas passage upstream from the air / fuel gas mixing section.
In the intake passage from the mixing section to the gas engine,
Both of which have a Mn-based catalyst, which reduces the activity of the catalyst.
Catalyst activity decrease detecting means for detecting that
When the activity of the engine has decreased
Deodorization with catalyst regeneration means that supplies air upstream from the catalyst
It is a gas engine with a device and detects the decrease in the catalyst activity.
The means is based on the data from the cumulative engine speed meter.
A constant cumulative engine speed is used to detect a decrease in catalyst activity.
Configured to detect a decrease in the above-mentioned catalyst activity.
The catalyst is regenerated by the catalyst regeneration means at every engine speed.
At the same time as the regeneration, at least the number of times the Mn-based catalyst is regenerated
As the number increases, the catalyst activity is detected again after the catalyst is regenerated.
It is characterized and this <br/> for setting the predetermined cumulative engine speed reduced to.

[0008]

[0009]

[0010]

According to the present invention, the odorant in the fuel gas is removed by at least the Mn-based catalyst, and when the activity of the catalyst decreases, air is supplied from the intake system to the upstream of the catalyst during engine operation. , Regenerate the catalyst to maintain its activity. this
Every predetermined cumulative operating time when a decrease in catalyst activity is detected
In addition to regenerating the catalyst by the catalyst regenerating means,
The higher the number of Mn-based catalyst regenerations, the more
And cumulative total operating time until detection of catalyst activity decrease
Is set to a short value, and the catalyst activity becomes low depending on the usage condition of the catalyst.
Detect the bottom.

According to the second aspect of the invention, at least Mn
The odorant in the fuel gas is removed by the system catalyst to activate the catalyst.
When the degree of deterioration is low, the catalyst upstream from the intake system during engine operation
Air is supplied to the catalyst to regenerate the catalyst and maintain its activity.
Predetermined cumulative engine speed at which a decrease in catalyst activity is detected
The catalyst is regenerated by the catalyst regeneration means and
Even if the Mn-based catalyst is regenerated more often,
The predetermined cumulative error until the decrease of the catalyst activity is detected again
The engine speed is set to a small value, depending on the usage condition of the catalyst.
Detect a decrease in catalyst activity.

[0012]

[0013]

[0014]

Embodiments of the gas engine with a deodorizing device of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an engine-driven heat pump including a gas engine with a deodorizing device.

The engine-driven heat pump 1 is composed of an outdoor unit 2 and an indoor unit 3. The indoor unit 3 includes an indoor heat exchanger 4 for refrigerant and an expansion valve 11 for decompression. The outdoor unit 2 includes a gas engine 7 with a deodorizing device, a compressor 8, an accumulator 9, an outdoor heat exchanger 10 for refrigerant, and a four-way valve 13.

As the gas engine 7 with the deodorizing device, a 4-cycle water-cooled gas fuel engine is used. A starting motor 15 is connected to a crankshaft 14 of a gas engine 7 with a deodorizing device via a starting clutch 16, and an output clutch 1 is connected to an output shaft 17 of the gas engine 7 with a deodorizing device.
A compressor 8 is connected via 8.

An intake passage 20 is connected to an intake port 19 of a gas engine 7 with a deodorizing device, a throttle 21 and an air cleaner 22 are arranged in the intake passage 20, and an opening 20a of the intake passage 20 is opened to the outside. There is. The throttle 21 is driven by a governor device 23 connected to the crankshaft 14 and utilizing crank power. A venturi portion 80 is provided in the intake passage 20 between the throttle 21 and the air cleaner 22. Venturi section 80
The fuel gas passage 24 is joined to the intake passage 20 in the mixing section X constituted by
A fuel gas source 25 is connected to 0. A zero governor (pressure reducer) 26 is arranged in the fuel gas passage 24, and the zero governor 2 is provided.
A flow rate control valve 28 is arranged on the downstream side of 6, and two opening / closing valves 27, 29 are arranged on the upstream side.

An exhaust passage 31 is connected to the exhaust port 30 of the gas engine 7 with the deodorizing device.
An exhaust heat exchanger 32 and a silencer 33 are disposed in the exhaust passage 31, and an opening 31a of the exhaust passage 31 is open to the outside. The exhaust heat exchanger 32 and the silencer 33 are connected to a neutralizer 34, and when the water vapor in the exhaust gas cools and condenses into drain water, it is discharged to the neutralizer 34.

The engine driven heat pump 1 is provided with a cooling water circulation system S. The cooling water circulation system S, when the cooling water temperature is equal to or lower than a predetermined value, cools the cooling water jacket 35, the thermostat 36, and the cooling water pump 37 of the gas engine 7 with the deodorizing device. The exhaust heat exchanger 32, the linear three-way valve 38, the radiator 39 on the one side, the heat exchange section 40 in the accumulator 9 and the second circulation path S2 circulating the second cooling water pump 41, and the cooling water temperature When the engine is warmed up when the predetermined value is exceeded, the second cooling water pump 41 branches off, one of which is the first cooling water pump 3
7. Cooling water jacket 3 for gas engine 7 with deodorizing device
5, the thermostat 36 circulates, the other circulates to the exhaust heat exchanger 32 and then merges, the linear three-way valve 38, one radiator 39, the other heat exchanger 4 in the accumulator 9.
It has the 3rd circulation path S3 which circulates in order of 0 and the 2nd cooling water pump 41.

The gas engine 7 with a deodorizing device has an output shaft 1
7, the compressor 8 is driven through the output clutch 18, and the discharge port of the compressor 8 has a refrigerant pipe 42, the four-way valve 13 switched to the cooling operation position, and a refrigerant pipe 43 through the refrigerant outdoor heat exchange. It is connected to the vessel 10, the expansion valve 11, and the refrigerant indoor heat exchanger 4. The two heat exchangers 10, 4 are connected to the refrigerant line 4
The accumulator 9 is connected to the suction port of the compressor 8 via the refrigerant pipe 46, the four-way valve 13, the refrigerant pipe 45, the heat exchange section 40 in the accumulator 9, and the refrigerant pipe 46. .

When operating as a cooling system, the four-way valve 13 is operated so that the first port 13a and the third port 13c communicate with each other, and at the same time, the fourth port 13d and the second port 13b communicate with each other. It will be in a state of

As a result, the compressor 8 is driven by the gas engine 7 with the deodorizing device, the refrigerant is compressed, and the compressed high-temperature and high-pressure refrigerant gas is transferred to the outdoor heat exchanger 10 for refrigerant in the outdoor unit 2. It is cooled and liquefied by the outside air. The liquefied refrigerant is decompressed, and the refrigerant liquid having a low pressure evaporates by taking heat from the indoor air in the refrigerant indoor heat exchanger 4 of the indoor unit 3. A cooling effect is generated by the heat of vaporization at this time to cool the room. The evaporated refrigerant gas is separated from the liquid phase refrigerant by the accumulator 9, only the gas component returns to the compressor 8 again, and the same cycle is repeated.

When operating as heating, the four-way valve 13 is operated so that the first port 13a communicates with the fourth port 13d and the third port 13c communicates with the second port 13b. Let it be in the state where it was made.

As a result, the compressor 8 is driven by the gas engine 7 with the deodorizing device to compress the refrigerant, and the compressed refrigerant gas of high temperature and high pressure is transferred to the indoor heat exchanger 4 for refrigerant in the indoor unit 3. , Cooled by room air and liquefied. At this time, the indoor air is warmed by the heat of condensation to produce a heating effect. The liquefied refrigerant is decompressed, and the low-pressure refrigerant liquid is used as the refrigerant outdoor heat exchanger 1 of the outdoor unit 2.
At 0, the heat of the outside air is taken away, and the evaporated refrigerant gas is again compressed by the compressor 8
Then, the same cycle is repeated.

In this engine driven heat pump 1,
Fuel gas passage 24 upstream from the mixing portion X of air and fuel gas
Alternatively, the catalyst E is arranged in the intake passage 20 from the mixing section X to the gas engine 7 with the deodorizing device.

As the fuel gas, for example, a fuel gas containing three kinds of odorants may be used, and this deodorization is performed by a catalyst. Among fuel gas, three types of odorants, that is, mercaptan type odorants, depending on the city gas manufacturing company
It may contain a sulfide type odorant and a thiophene type odorant. When such a fuel gas is used, as a catalyst for the mercaptan odorant, a Cu-H ion-exchange zeolite catalyst, a Mn oxide-ceramic catalyst, a Cu-Mn catalyst, a hopcalite catalyst, a Mn-Fe catalyst are used. As a catalyst for sulfide-based odorants, Mn oxide-ceramic catalyst, Cu-Mn catalyst,
There are hopcalite catalysts, Mn-Fe-based catalysts, etc., and as catalysts for thiophene-based odorants, Mn oxide-ceramic catalysts, Cu-Mn catalysts, hopcalite catalysts, Mn
It is preferable to use a —Fe-based catalyst or the like, and as a catalyst capable of removing both the sulfide-based odorant and the thiophene-based odorant, a Mn oxide-ceramic catalyst, a hopcalite catalyst, a Mn-Fe-based catalyst, or the like is used. It can also be used.

The catalyst E is located in the fuel gas passage 24 upstream of the air / fuel gas mixing section X at a position A between the on-off valve 27 on the upstream side of the zero governor 26 or on the downstream side of the zero governor 26 by the flow control valve 28. It is located at position B between. Alternatively, the catalyst E is arranged in a position C on the upstream side of the throttle 21 or a position D on the downstream side of the mixing part X in the intake passage 20 from the mixing part X to the gas engine 7 with the deodorizing device. The odorant in the fuel gas is removed by the catalyst E arranged at at least one of the positions A, B, C and D.

A catalyst activity decrease detecting means Z for detecting the decrease of the catalyst activity, and a catalyst regenerating means Y for supplying air from the intake system to the catalyst upstream during the operation of the gas engine when the activity of the catalyst E is decreased. Is provided, and the catalyst regenerating means Y is configured as shown in FIGS. 2 and 3. FIG. 2 shows an embodiment in which the catalyst E is arranged at the positions B, C and D. The catalyst regenerating unit Y connects the upstream side of the catalyst E and the downstream side of the air cleaner 22 via an air passage 50, and the air passage 50 is provided with an opening / closing valve 51. An opening degree adjustment valve may be arranged instead of the opening / closing valve 51. When the activity of the catalyst E decreases, the on-off valve 51 is opened to supply air to the upstream of the catalyst to regenerate the catalyst E. In this way, in the case where the catalyst E is arranged at the positions B, C, D, it is only necessary to arrange the opening / closing valve 51 or the opening adjustment valve between the air intake 50a and the air introduction port 50b.
These are opened by the negative pressure of the combustion chamber in the intake stroke of the engine,
Air can be supplied by this opening operation. In the case where the catalyst E is arranged at the positions C and D, the air inlet 50b is the venturi portion 80 or the venturi portion 80.
Can be provided at any position of the intake passage 20 between the catalyst E and the catalyst E. Further, in the case where the catalyst E is arranged at the position B, the air introduction port 50b is provided between the zero governor 26 and the catalyst E.

FIG. 3 shows another embodiment in which the catalyst E is arranged at the position A. In this embodiment, the air passage 50 is provided with an air pump 52 and an on-off valve 51 for resisting the fuel gas pressure before pressure reduction. An opening degree adjustment valve may be provided instead of the opening / closing valve 51. When the activity of the catalyst E decreases,
The on-off valve 51 is opened, the air pump 52 is driven to supply the air upstream of the catalyst, and the catalyst E is regenerated.

When the catalyst E is arranged in B, C and D while the air inlet 50b is arranged in the fuel gas passage 24 upstream of the zero governor 26, the air pump 52 is required as in the embodiment of FIG. Become.

As the air pump 52, for example, an electric drive pump, a pump using crank power, a pump using crank chamber pressure fluctuation, or the like can be used.

When the air pump 52 is provided and the opening adjustment valve is provided, the capacity of the air pump 52 or the opening of the opening adjustment valve is increased as the degree of activity becomes lower. Further, the capacity of the air pump 52 or the opening degree of the opening degree adjusting valve is increased as the number of times of catalyst regeneration is increased.

When the catalyst E is arranged at the positions C and D, the air inlet 50b is provided upstream of the catalyst E and downstream of the mixing section X as described above. Do not mix.

Next, the control when the activity of the catalyst E decreases will be described with reference to FIGS. 4 and 5. FIG. 4 is a control block diagram when the activity of the catalyst is lowered.

The control unit 60 includes a cumulative operating time meter 6
1, cumulative engine speed meter 62, catalyst activity sensor 63, predetermined value data 64, air pump drive frequency meter 6
5, data is input from the engine speed sensor 66 and the load sensor 67. Further, an air passage open / close valve drive actuator 68 and an air pump drive actuator 69 are connected to the control device 60.

The catalyst activity decrease detecting means Z for judging the decrease of the catalyst activity is a predetermined activity from the data of the catalyst activity sensor 63, or a predetermined cumulative operating time from the data of the cumulative operating time meter 61, or a cumulative engine revolution. From the data obtained by the several meters 62, the decrease in the catalyst activity is detected by at least one of the predetermined cumulative engine speeds. In the case of detecting the decrease in the catalyst activity based on the predetermined cumulative operating time, the predetermined cumulative time until the catalyst is regenerated is set to be shorter at each predetermined cumulative operating time, at least as the number of Mn-based catalyst regenerations increases. Thus, the decrease in the catalyst activity is detected according to the usage state of the catalyst. Also, intended to detect a drop in catalytic activity by a predetermined cumulative engine speed, smaller every predetermined cumulative engine speed, as the catalyst Views of at least Mn system is large, the predetermined cumulative engine speed to regenerate the catalyst It is configured so that it is set so that the decrease in the catalyst activity is detected according to the usage state of the catalyst.

The catalyst regenerating means Y drives the air passage opening / closing valve drive actuator 68 and the air pump drive actuator 69 to supply air from the intake system to the upstream side of the catalyst while the gas engine is operating when the activity of the catalyst E is reduced. It is like this.

The engine speed sensor 66 provides a predetermined cumulative engine speed or cumulative running time meter 61.
Thus, the catalyst is regenerated by driving the air passage opening / closing valve drive actuator 68 or the air pump drive actuator 69 for each predetermined cumulative operating time, and the catalyst regeneration time for supplying air for catalyst regeneration increases as the number of times of catalyst regeneration increases. Enlarge. Alternatively, the amount of air for catalyst regeneration is increased.

Further, not only the engine speed but also the load increases, the amount of air-fuel mixture supplied to the engine per unit time increases, so that the activity of the catalyst decreases faster. Therefore, it is not just the cumulative total of engine speed, but the load coefficient that becomes larger as the magnitude of the load is multiplied by the engine speed, and the multiplied value is stored in the cumulative engine speed meter. If the value becomes larger than the value of the predetermined value data, it may be determined that the catalyst activity has decreased, and the catalyst regeneration air supply device, for example, the opening / closing valve or the air pump 52 and the opening / closing valve 51 may be operated.

The load sensor 67 may be the pressure sensor 70 in the refrigerant circuit of FIG. 1, and the load may be large when the pressure on the downstream side of the compressor 8 is low. Further, the throttle opening sensor 71 of FIG. 1 may increase the load when the opening of the throttle 21 is large.

Further, the gas engine 7 with the deodorizing device has the zero governor 26, and when the engine speed decreases due to an increase in the load, the throttle opening is increased. Therefore, the engine speed sensor 66 or the throttle opening is used. The sensor 71 may be considered as a load sensor.

Next, the control when the activity of the catalyst is lowered will be described with reference to the flowchart of FIG. When the engine is operated at step a when the operation is started, at step b, one of the cumulative operating time data a, the cumulative engine speed data or the cumulative engine speed b multiplied by the load coefficient, and the catalyst activity data c. Is introduced. At step c, the cumulative operating time data a, the cumulative engine speed data b, and the predetermined value data a0, b0, c0 corresponding to the catalyst activity data c are taken in correspondingly, and further at step d, the air pump driving frequency, Alternatively, m relating to the number-of-operations data of the opening / closing valve 51 is incorporated.

At step e, any one of the cumulative operating time data a0, the cumulative engine speed data b0, the catalyst activity data c0, and the air pump driving frequency data f
Find the product with (m). F (m) related to the air pump drive count data is a coefficient that becomes smaller as the air pump drive count data m increases. If any of the cumulative operating time data a, the cumulative engine speed data b, and the catalyst activity data c is greater than or equal to the predetermined value data when the air pump drive rotation data m is taken in, the air passage 50 is opened / closed in step f. The valve 51 is opened, or at the same time, the air pump is driven. At step g, either the cumulative operating time data a or the cumulative engine speed data b is cleared, and at step h, the opening / closing valve 51 of the air passage 50 is closed after a predetermined time. Alternatively, the air pump 52 is stopped at the same time.

Next, another control when the catalyst activity is lowered will be described with reference to the flowchart of FIG. In this embodiment, the same control is performed from step a to step c of FIG. 5 from the operation to the input of the predetermined value data a0, b0, c0, and thereafter, step e1 to step e1 shown in FIG.
The control of step h1 is performed.

That is, in step e1, cumulative operating time data a, cumulative engine speed data b, catalyst activity data c
Is greater than or equal to one of the predetermined values a0, b0, c0, the open / close valve 51 of the air passage 50 is opened in step f1.
Is opened, the product of the predetermined time h0 and g (m) is calculated, and the air pump is driven for that time. g (m) becomes larger as m becomes larger. At step g1, either the cumulative operating time data a or the cumulative engine speed data b is cleared, and the air on-off valve is closed immediately after stopping the air pump (step h1).

As can be seen from the above, the catalyst activity decrease detecting means Z includes the catalyst activity itself, the cumulative operating time meter 61, the control device 60 and the input device for the predetermined value data 64.
Alternatively, an engine speed sensor 66, a cumulative engine speed meter 62, a control device 60 and an input device for the predetermined value data 64, or a load sensor 67 is further added,
Alternatively, all of the above are the ones to which the air pump drive speed meter 65 is added.

[0047]

As described above, according to the invention of claim 1, the predetermined cumulative operating time at which a decrease in the catalyst activity is detected is detected.
In addition, while the catalyst is regenerated by the catalyst regenerating means,
Even if the Mn-based catalyst is regenerated more often,
During predetermined cumulative operation until the catalyst activity is detected again
Set the interval to be short, and change the catalyst activity depending on the usage condition of the catalyst.
As the decrease is detected, the catalytic activity depends on the usage condition of the catalyst.
It is possible to detect a decrease in
It is possible to live.

According to the second aspect of the invention, the catalyst activity is lowered.
Is detected every predetermined cumulative engine speed, catalyst regeneration
The catalyst is regenerated by stages and at least the Mn-based
The higher the number of times of catalyst regeneration, the more
Decrease the predetermined cumulative engine speed until the drop is detected
Set and detect a decrease in catalyst activity according to the usage condition of the catalyst.
As we know, the catalyst activity decreases depending on the usage condition of the catalyst.
Can be detected and the catalyst can be regenerated at the appropriate time.
is there.

[0049]

[0050]

[Brief description of drawings]

FIG. 1 is a configuration diagram of an engine-driven heat pump including a gas engine with a deodorizing device.

FIG. 2 is a diagram showing an example of arrangement of catalysts.

FIG. 3 is a diagram showing another embodiment of arrangement of catalysts.

FIG. 4 is a control block diagram when the activity of the catalyst decreases.

FIG. 5 is a flowchart of control when the activity of the catalyst decreases.

FIG. 6 is a flowchart of another control when the activity of the catalyst decreases.

[Explanation of symbols]

7 Gas engine with deodorizer 20 Intake passage 24 Fuel gas passage E catalyst X mixing section Y catalyst regeneration means Z catalyst activity decrease detection means

Claims (2)

(57) [Claims] 1. A Bei example an intake system for supplying fuel gas mixed with odorizing gas is mixed with air, air from the air upstream of the fuel gas passage or the mixing portion than the mixing of the fuel gas to the gas engine At least a Mn-based catalyst is disposed in the passage, and a catalyst activity decrease detecting means for detecting a decrease in activity of the catalyst, and a catalyst from the intake system during operation of the gas engine when the activity of the catalyst decreases deodorizer with gas engine der provided with catalyst regeneration means for supplying air to the upstream
The catalyst activity decrease detection means is
According to the data obtained by the
It is configured to detect and the predetermined cumulative operating time when the decrease in the catalyst activity is detected.
In addition, when the catalyst is regenerated by the catalyst regenerating means,
In addition, as the number of Mn-based catalyst regeneration increases,
After the birth, the above predetermined time until the decrease in the catalyst activity is detected again
A gas engine with a deodorizing device, which is characterized by setting the total operating time to be short . 2. A fuel gas mixed with odorous gas is mixed with air.
And an intake system for supplying the fuel gas to the fuel gas passage upstream of the mixing portion of the air and the fuel gas.
In the intake passage from the mixing section to the gas engine,
Catalytic activity for arranging at least a Mn-based catalyst to detect a decrease in the activity of the catalyst
Degradation detection means and gas sensor when the activity of the catalyst is reduced.
Air is supplied to the catalyst upstream from the intake system during engine operation
A gas engine with a deodorizing device equipped with catalyst regeneration means.
The catalyst activity decrease detection means is
Based on the data from the data
The engine is configured to detect a decrease in the degree of activity, and the predetermined cumulative engine times at which the decrease in the catalyst activity is detected.
When the catalyst is regenerated by the catalyst regenerating means for every number of turns,
In both cases, the more the Mn-based catalyst is regenerated, the more
After the regeneration, the above steps until the catalyst activity is detected again
A gas engine with a deodorizing device characterized by setting the constant cumulative engine speed to a small value .