JP2002250217A - Apparatus and method for filtering diesel smoke for stationary diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for filtering diesel smoke for a stationary diesel engine, which can filter particulates in exhaust gas at a time of start and low load of the engine and surely filter particulates generated at the time of the start and low load of the engine. SOLUTION: An opening/closing bypass damper 5 is disposed at a middle portion of an exhaust gas duct 4 guiding the exhaust gas 2 discharged from the diesel engine 1. On the other hand, a bypass line 6 is connected to the exhaust gas duct 4, and an opening/closing inlet damper 7 and an opening/ closing outlet damper 8 are respectively disposed to an inlet 6a and an outlet 6b of the bypass line 6. A dust removing apparatus 9 that is used only at the time of start and low load of the diesel engine 1 and an induced draft fan 10 for suppressing increase in pressure at an inlet of the dust removing apparatus 9 are disposed to the bypass line 6 between the inlet damper 7 and outlet damper 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black smoke removing device and a black smoke removing method for a stationary diesel engine used only at the time of starting and low load.

[0002]

2. Description of the Related Art Generally, a stationary diesel engine 51 as shown in FIG. 2 is often used for a constant output operation (base load load) unlike a diesel engine mounted on a vehicle or the like. The exhaust gas 52 is led to the chimney 55 via the exhaust gas duct 53 and the muffler 54 with almost no change in output, and is discharged from the chimney 55 as it is into the atmosphere. Therefore, the stationary diesel engine 51 has a specific problem that a large amount of black smoke is generated from the chimney 55 only at the time of starting. On the other hand, as a dust removal technology, a filter made of ceramics or the like having the highest dust removal efficiency is currently provided. By installing the filter in an exhaust gas duct 53 or the like, dust and the like in the exhaust gas 52 are removed. I have.

[0003]

However, in the above-described conventional dust removal technology, since filters such as ceramics are very expensive, which is several times as large as that of a diesel engine main body, a filter for stationary installation required only at the time of starting is required. Use for the diesel engine 51 is not practical and is economically disadvantageous. As a conventional dust removal technique, the exhaust gas 52 discharged from the stationary diesel engine 51 is guided to a storage tank (not shown), and the exhaust gas 52 is swirled in the storage tank to generate a swirling flow. There is a multicyclone or the like that removes dust by dropping it. However, in the stationary diesel engine 51, since the amount of exhaust gas to be discharged changes, it is difficult to cope with the flow at the time of starting, and a swirl flow of the exhaust gas 52 cannot be created. It is inappropriate to apply when starting the diesel engine 51.

[0004] The present invention has been made in view of such circumstances, and an object of the present invention is to remove soot and dust in exhaust gas at the time of starting and at a low load, and to remove black smoke generated at the time of starting and at a low load. It is an object of the present invention to provide a black smoke removing device and a black smoke removing method for a stationary diesel engine that can be reliably removed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides an openable / closable bypass damper in an exhaust gas duct for guiding exhaust gas discharged from a diesel engine. A bypass line is connected to the duct, and openable and closable dampers are respectively provided at the entrance and exit of the bypass line. The bypass line between the entrance and exit dampers is used only when the diesel engine is started and when the load is low. A dust device is provided, and an induction fan for suppressing an increase in the inlet pressure of the dust removing device is provided.

Also, the present invention provides an exhaust gas duct for guiding exhaust gas discharged from a diesel engine, an openable / closable bypass damper provided in the exhaust gas duct, a bypass line connected to the exhaust gas duct, Using an openable / closable entrance / exit damper provided at the entrance / exit of the line, and a dust removing device and an induction fan provided on a bypass line between these entrance / exit dampers, and during normal operation of the diesel engine, the entrance / exit damper is used. The bypass damper is opened in the closed state, and the exhaust gas of the diesel engine is discharged through the exhaust gas duct and the bypass damper. When the diesel engine is started and the load is low, the entrance / exit port is closed with the bypass damper closed. Open the damper and pass the exhaust gas of the diesel engine to the exhaust gas duct,
The dust removal device guides the dust removal device through the bypass line and the inlet damper, and removes dust in the exhaust gas by the dust removal device while suppressing an increase in the inlet pressure of the dust removal device by the induction fan. The exhaust gas from which is removed is discharged through the bypass line, the outlet damper, and the exhaust gas duct.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIG. 1 is a schematic diagram of a black smoke removing device for a stationary diesel engine according to an embodiment of the present invention.

As shown in FIG. 1, a black smoke removing device for a stationary diesel engine according to an embodiment of the present invention mainly emits exhaust gas 2 discharged from a stationary diesel engine 1 to a chimney 3.
Exhaust gas duct 4 leading to the exhaust gas duct 4, an openable / closable bypass damper 5 provided in the middle of the exhaust gas duct 4, a bypass line 6 whose entrances 6a, 6b at both ends are connected to the exhaust gas duct 4, Entrance / exit 6a, 6b
Are provided with openable and closable entrance / exit dampers 7 and 8, and a dust removal device 9 and an induction fan (IDF) 10 provided on a bypass line 6 between the entrance and exit dampers 7 and 8. In the middle of the exhaust gas duct 4 and upstream of the inlet 6a of the bypass line 6 (the diesel engine 1
On the side), there is a silencer 11 that silences the exhaust sound of the diesel engine 1.
The exhaust gas 2 passes through the exhaust gas duct 4 and the muffler 11 and is finally discharged from the chimney 3 into the atmosphere.

The bypass line 6 is formed in a U-shape in which the connection on the inlet 6a side is located upstream of the bypass damper 5, and the connection on the outlet 6b side is located downstream of the bypass damper 5. . Therefore, the exhaust gas 2 guided from the exhaust gas duct 4 to the bypass line 6 bypasses the installation location of the bypass damper 5, passes through the inlet damper 7, the dust-removing device 9, the induction fan 10 and the outlet damper 8, and returns to the exhaust gas duct. 4. The bypass damper 5 and the inlet / outlet dampers 7, 8 are controlled to be opened and closed by the output of the diesel engine 1, and control the use output range.

The dust removing device 9 installed in the middle of the bypass line 6 is used only when the diesel engine 1 is started and when the load is low, and the inside of the dust removing device 9 is a source of black smoke. A filter (not shown) such as a ceramic for removing dust and the like in the exhaust gas 2 is provided. In addition, the dust removal device 9 is provided with an induction fan 10.
A rotary valve 12 is provided at the bottom of the rotary valve 12 as an open / close valve for discharging the removed dust to the outside of the system. Here, the time of starting and the time of low load refer to a state where the output of the diesel engine 1 is 25% or less of the constant output operation with respect to 100%.

On the other hand, the induction fan 10 is provided to make a filter or the like provided in the dust removal device 9 compact and to suppress a rise in the inlet pressure of the dust removal device 9 by inverter control. It is. That is, when the diesel engine 1 is started and when the load is low, the amount of the exhaust gas 2 gradually increases as the start and the load increase,
Since the inlet pressure of the dust removing device 9 also increases, the induction fan 1
By increasing the discharge pressure of 0, the inlet pressure of the dust removing device 9 can be kept constant.

A method for removing black smoke using the black smoke removing device according to the present embodiment is as follows. First, the normal operation of the stationary diesel engine 1 is a constant output operation and does not generate black smoke. Therefore, the black smoke removing device is not operated, and the bypass dampers 7 and 8 are closed with the inlet / outlet dampers 7 and 8 closed. 5, the exhaust gas 2 of the diesel engine 1 is guided to the chimney 3 via the exhaust gas duct 4, the muffler 11, and the bypass damper 5, and is discharged from the chimney 3 as it is into the atmosphere.

On the other hand, when the stationary diesel engine 1 is started and when the load is 25% or less when the load is low, black smoke is generated. Therefore, the black smoke removing device is operated. That is, with the bypass damper 5 closed, the entrance / exit damper 7,
8, the exhaust gas 2 of the diesel engine 1 is guided to the bypass line 6 via the exhaust gas duct 4 and the muffler 11. Next, the exhaust gas 2 is guided from the inlet 6 a of the bypass line 6 to the dust removing device 9 via the inlet damper 7,
Thus, dust in the exhaust gas 2 causing black smoke is removed by a filter (not shown) in the dust removing device 9 while suppressing an increase in the inlet pressure of the dust removing device 9. Here, the removed dust is collected at the bottom of the dust removing device 9, extracted from the opened rotary valve 12, conveyed out of the system by a belt conveyor or the like, and discharged. Thereafter, the exhaust gas 2a from which the dust has been removed is discharged to the exhaust gas duct 4 from the outlet 6b of the bypass line 6 through the attraction fan 10 and the outlet damper 8, and is guided to the chimney 3 and discharged to the atmosphere.

In the apparatus for removing black smoke of the stationary diesel engine 1 according to the embodiment of the present invention, in addition to the exhaust gas duct 4 for guiding the exhaust gas 2, a bypass damper 5 is provided in the exhaust gas duct 4, and the inlet / outlet dampers 7, 8 is connected to the bypass line 6 provided with the inlet / outlet dampers 7 and 8, and the dust removing device 9 used only when the diesel engine 1 is started and at a low load is provided in the bypass line 6 between the inlet / outlet dampers 7 and 8. At the time of start-up and low load, the inlet / outlet dampers 7 and 8 are opened with the bypass damper 5 closed, and the exhaust gas 2 of the diesel engine 1 is removed through the exhaust gas duct 4, the bypass line 6 and the inlet damper 7 and the dust removal device 9. The dust in the exhaust gas 2, which is black smoke, is removed in the dust removing device 9, and then the exhaust gas 2 a from which the dust is removed is passed through the bypass line 6 and the outlet 8 and flue gas duct 4 through the chimney 3
And the smoke is discharged into the atmosphere from the chimney 3, so that the black smoke generated at the time of starting the diesel engine 1 and at a low load can be reliably removed. Moreover, in the black smoke removing device of the present embodiment, since the induction fan 10 is provided in the bypass line 6 on the downstream side of the dust removal device 9, the inlet pressure of the dust removal device 9 is increased by the inverter control of the suction fan 10. This makes it possible to smoothly perform the dust-removing function of the dust-removing device 9 and make the dust-removing device 9 compact.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical concept of the present invention. is there. For example, an opening / closing valve other than the rotary valve 12 may be provided at the bottom of the dust removing device 9. In other words, any valve that can reliably and quickly take out the dust accumulated at the bottom may be used.

[0016]

As described above, the black smoke removing device for a stationary diesel engine according to the present invention is provided with an openable / closable bypass damper in the middle of an exhaust gas duct for guiding exhaust gas discharged from the diesel engine, while the exhaust gas duct And a bypass line that can be opened and closed is provided at the entrance and exit of the bypass line, and the bypass line between these entrance and exit dampers is provided with dust that is used only when the diesel engine is started and at a low load. In addition to the installation of the device, an induction fan for suppressing an increase in the inlet pressure of the dust removal device is provided, so that the black smoke which has conventionally been generated at the time of starting the diesel engine and at a low load can be reliably removed, and the environment around the plant can be removed. Can be avoided. In addition, the black smoke removing device of the present invention can enhance the function of the dust removing device by the induction fan, achieve downsizing, and reduce the equipment cost.

Further, the method for removing black smoke of a stationary diesel engine according to the present invention comprises: an exhaust gas duct for guiding exhaust gas discharged from the diesel engine; an openable / closable bypass damper provided in the exhaust gas duct; The diesel engine using a bypass line connected to a duct, an openable and closable damper provided at the entrance and exit of the bypass line, and a dust removing device and an induction fan provided on a bypass line between the entrance and exit dampers. During normal operation, the bypass damper is opened with the inlet / outlet damper closed, exhaust gas of the diesel engine is discharged through the exhaust gas duct and the bypass damper, and when the diesel engine is started and at a low load, With the bypass damper closed, the inlet / outlet damper is opened, and the exhaust gas of the diesel engine is discharged. The exhaust gas duct, the bypass line and the inlet damper are guided to the dust removing device, and while the inlet pressure of the dust removing device is suppressed by the attraction fan, dust in the exhaust gas is removed by the dust removing device, Thereafter, the exhaust gas from which the dust has been removed is discharged through the bypass line, the outlet damper, and the exhaust gas duct, so that the same effect as the above invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a black smoke removing device for a stationary diesel engine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a path for guiding exhaust gas discharged from a conventional stationary diesel engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stationary diesel engine 2, 2a Exhaust gas 3 Chimney 4 Exhaust gas duct 5 Bypass damper 6 Bypass line 6a Inlet 6b Outlet 7 Inlet damper 8 Outlet damper 9 Dust removal device 10 Induction fan 11 Silencer 12 Rotary valve

Claims (2)

[Claims] An exhaust gas duct for guiding exhaust gas discharged from a diesel engine is provided with an openable / closable bypass damper in the middle of the exhaust gas duct, while a bypass line is connected to the exhaust gas duct, and an inlet / outlet opening / closing port for the bypass line is provided. A damper is provided, and a dust removal device used only when the diesel engine is started and at a low load is provided in a bypass line between the inlet and outlet dampers, and an induction fan for suppressing an increase in the inlet pressure of the dust removal device is provided. A black smoke removing device for a stationary diesel engine. 2. An exhaust gas duct for guiding exhaust gas discharged from a diesel engine, an openable / closable bypass damper provided in the exhaust gas duct, a bypass line connected to the exhaust gas duct, and an entrance / exit of the bypass line. In the normal operation of the diesel engine, with the inlet / outlet damper closed, using the openable / closable entrance / exit damper provided in the and the dust removal device and the induction fan provided in the bypass line between these entrance / exit dampers Opening the bypass damper, exhausting the exhaust gas of the diesel engine through the exhaust gas duct and the bypass damper, at the start of the diesel engine and at low load, open the inlet / outlet damper with the bypass damper closed, The exhaust gas of the diesel engine is passed through the exhaust gas duct, the bypass line, and the inlet damper. The dust removal device removes the dust from the exhaust gas in the dust removal device while suppressing the rise in the inlet pressure of the dust removal device by the induction fan, and then passes the exhaust gas from which the dust has been removed to the bypass line. Exhausting the exhaust gas through the outlet damper and the exhaust gas duct.