JP2021063507A - Heating gas generation device for exhaust gas treatment device for internal combustion engine - Google Patents

Abstract

To enable a function of an exhaust gas treatment device.SOLUTION: A heating gas generation device for feeding heating gas to an exhaust gas economizer 16 provided in an exhaust passage 100 of an engine 11 includes: a heating unit 30 including a burner device 31 for feeding combustion gas to a confluent conduit 15 upstream of the exhaust gas economizer 16; a mixing air introduction pipeline 36 for introducing outside air for mixing with the combustion gas fed from the burner device 31 in the heating unit 30; and an opening adjustment valve 39 adjusting outside air introduction amount. Even during stop of the engine 11, preheating and regeneration of the exhaust gas economizer 16 are enabled.SELECTED DRAWING: Figure 10

Description

The present invention relates to a heating gas generator for an exhaust gas treatment device of an internal combustion engine, particularly a marine diesel engine, and relates to a heating gas generator for generating a heating gas for heating the exhaust gas.

A technique for removing nitrogen oxides by a selective reducing action on a denitration catalyst using ammonia or urea as a denitration reducing agent is generally adopted as an exhaust gas treatment device, for example, a denitration device for exhaust gas of a marine diesel engine. There is.

In this case, if the temperature of the exhaust gas from the internal combustion engine is low, the denitration catalyst does not reach an appropriate functional temperature, so that the denitration action of the exhaust gas by the denitration catalyst is impaired, and the denitration performance deteriorates. In addition, water and sulfate gas (SO2, SO3) contained in the exhaust gas react with ammonia to precipitate ammonium hydrogensulfate (hereinafter referred to as acidic ammonium sulfate), and the acidic ammonium sulfate passes through the exhaust gas path such as a denitration catalyst. There is a problem that it adheres to the surface of the constituent equipment, the flow path resistance of the exhaust gas path increases, and the function such as the catalyst function deteriorates. Further, when the temperature of the denitration catalyst is low, a soluble organic component (hereinafter referred to as SOF) contained in the internal combustion engine is generated (see Non-Patent Document 1 and Non-Patent Document 2). Then, this SOF adheres to soot containing unburned fuel, sulfur, etc. in the exhaust gas, that is, carbon fine particles (hereinafter, such carbon fine particles are collectively referred to as PM (particulate matter)). In this state, it is known that the SOF acts as a binder and the PM adheres to the catalyst surface to reduce the catalyst function.

In order to deal with these problems, in the techniques disclosed in Patent Document 1 and Patent Document 2, the exhaust gas flowing to the denitration catalyst side is raised by using a heating device utilizing a combustion action on the upstream side of the denitration catalyst. I try to keep it warm.

Japanese Unexamined Patent Publication No. 6-173658 Japanese Unexamined Patent Publication No. 2012-82804

M. Tuda et al., CIMAC Congress 2013 Shanghai, Paper No.255. Zhide XU et al., Journal of the JIME, Vol.46 NO.3 (2011).

As described above, in Patent Document 1 and Patent Document 2, the exhaust gas is heated by the combustion action of the operation of the heating device, and the temperature of the denitration catalyst is raised. Therefore, in order to obtain the denitration action, the internal combustion engine is used. It is necessary to operate the engine to supply the exhaust gas from the internal combustion engine to the catalyst and allow it to pass through the catalyst.

However, since the denitration catalyst is cold when the internal combustion engine is started, denitration that supplies ammonia or urea as a denitration reducing agent cannot be performed from the time when the internal combustion engine is started until the denitration catalyst reaches an appropriate temperature. Further, during this period, the SOF in the engine exhaust gas adheres to the PM, so that the PM adheres to the surface of the denitration catalyst as described above. When such an operation is executed, there is a problem that the denitration efficiency of the denitration catalyst decreases in a short period of time. Therefore, in such a situation, after that, denitration must be started in a state where the denitration performance is deteriorated from the beginning. In particular, since the SOF derived from the lubricating oil of the engine has an evaporation peak temperature of 250 to 280 ° C., even if the denitration catalyst exerts its function at a temperature lower than this, the PM is generated by the SOF derived from the lubricating oil. If the denitration catalyst adheres to the surface of the catalyst and the surface of the denitration catalyst is covered with PM, the denitration catalyst cannot exert its original function and causes functional deterioration.

Such a problem is not limited to the above-mentioned denitration device, but is a problem common to exhaust gas treatment devices of internal combustion engines including an exhaust heat recovery device.
An object of the present invention is to provide a heated gas generator for an exhaust gas treatment device of an internal combustion engine, which can solve the problems of the above technology, maintain the temperature in the exhaust gas path at an appropriate level, and maintain an effective function. To provide.

In order to achieve the above object, the heating gas generator for the exhaust gas treatment device of the internal combustion engine of the present invention is an internal combustion engine that supplies the heating gas to the exhaust gas treatment device provided in the exhaust gas path of the internal combustion engine. A heating unit for an exhaust gas treatment device, which includes a burner device for supplying combustion gas to the exhaust gas path on the upstream side of the exhaust gas treatment device, and the burner device in the heating unit. It is characterized by including an outside air introducing means for introducing outside air for mixing with the exhaust gas supplied from the engine and an opening degree adjusting valve for adjusting the amount of outside air introduced in the outside air introducing means.

Further, in different aspects of the heating gas generator for the exhaust gas treatment device of the internal combustion engine of the present invention, for the exhaust gas treatment device of the internal combustion engine that supplies the heating gas to the exhaust gas treatment device provided in the exhaust gas path of the internal combustion engine. A heating unit including a burner device for supplying combustion gas to the exhaust gas path on the upstream side of the exhaust gas treatment device, and at one end of a combustion chamber of the burner device. Is connected so that the burner is arranged and the exhaust gas path of the internal combustion engine is connected to the other end of the combustion chamber so that the exhaust gas crosses the high temperature region of the combustion chamber in a direction substantially orthogonal to the axis of the combustion chamber. The exhaust gas of the internal combustion engine supplied from the exhaust gas path is supplied to the combustion chamber.

The heating unit may be provided with an outside air introducing means for introducing outside air for mixing with the combustion gas discharged from the combustion chamber.
In the heating gas generator for the exhaust gas treatment device of the internal combustion engine, the heating unit is arranged on the downstream side of the burner device and the outside air introducing means, and the combustion gas supplied from the burner device and the internal combustion engine. A mixer that mixes the exhaust gas discharged from the exhaust gas path of the engine and the outside air supplied from the outside air introducing means may be provided.

Further, a first temperature sensor may be provided between the exhaust gas treatment device and the heating unit.
The outside air supplied from the outside air introducing means may pass outside the outer wall of the combustion chamber of the burner device.

These can be suitably applied to an exhaust heat recovery device as the exhaust gas treatment device.
The heating gas generator for the exhaust gas treatment device of the internal combustion engine has a bypass exhaust gas path different from the exhaust gas path that branches from the exhaust gas path of the internal combustion engine and joins the exhaust gas path upstream of the heating unit, and the bypass exhaust gas path. A denitration device provided in the above, a first valve that shuts off the bypass exhaust gas path on the upstream side and the downstream side of the exhaust gas path, and a second valve that shuts off the bypass exhaust gas path upstream and downstream of the bypass exhaust gas path. The valve and a part of the exhaust gas heated from the heating unit may be provided with a branched exhaust gas path that returns a part of the exhaust gas heated from the heating unit to the confluence point of the bypass exhaust gas path on the upstream side of the denitration device.

Further, the branched exhaust gas path may be provided with a third valve that shuts off the heating unit and the confluence.
Further, a fan arranged in the branched exhaust gas path and sending the mixed gas heated by the heating unit to the confluence point of the branched exhaust gas path and the bypass exhaust gas path, and a fan arranged in the confluence point and sent by the fan. A mixer may be provided which mixes the supplied mixed gas and the exhaust gas discharged from the internal combustion engine of the bypass exhaust gas path and sends the mixed gas to the denitration device.

In addition, a second temperature sensor arranged in the bypass exhaust gas path between the confluence point and the denitration device may be provided.

According to the present invention, there is an effect that the temperature in the exhaust gas path, and by extension, the temperature of the exhaust gas treatment device can be maintained at an appropriate level.

The schematic diagram which shows the 1st Embodiment. The block diagram which shows the electrical structure of an embodiment. The schematic diagram which shows the 2nd Embodiment. The schematic diagram which shows the 3rd Embodiment. The schematic diagram which shows the 4th Embodiment. The schematic diagram which shows the 5th Embodiment. The schematic diagram which shows the 6th Embodiment. The schematic diagram which shows the 7th Embodiment. The schematic diagram which shows the 8th Embodiment. The schematic diagram which shows the 9th Embodiment. The schematic diagram which shows the tenth embodiment. The schematic diagram which shows the eleventh embodiment. The schematic diagram which shows the twelfth embodiment. The schematic diagram which shows the modification example.

Hereinafter, examples of modification of each embodiment and the embodiment in the heating gas generator for the denitration device of the internal combustion engine which embodies the present invention and the operation method thereof will be described with reference to the drawings. These embodiments and modifications are implemented in a marine diesel engine as an internal combustion engine. Specifically, it is a heating gas generator for a main engine such as a 2-stroke diesel engine or a low-speed 4-stroke diesel engine, or a denitration device for an auxiliary engine such as a medium- and high-speed 4-stroke diesel engine. To be made. In the following, these diesel engines are simply referred to as engines.

(First Embodiment)
The first embodiment will be described.
As shown in FIG. 1, a common exhaust gas pipeline (hereinafter referred to as a common pipeline) 12 is connected to the downstream side of the exhaust gas receiver (not shown) and the supercharger (not shown) of the engine 11. A first exhaust gas pipeline (hereinafter referred to as a first pipeline) 13 and a second exhaust gas pipeline (hereinafter referred to as a second pipeline) 14 are connected to the common pipeline 12 in a branched state. The downstream sides of the first pipeline 13 and the second pipeline 14 are connected to and merged with the merging exhaust gas pipeline (hereinafter referred to as the merging pipeline) 15. The exhaust gas path 100 is composed of the common pipeline 12, the first pipeline 13, the second pipeline 14, and the merging pipeline 15.

An exhaust gas economizer 16 constituting an exhaust heat recovery means is connected to the merging pipeline 15. The exhaust gas economizer 16 has a heat transfer tube (not shown) inside for recovering the heat of the exhaust gas, heats the fluid in the heat transfer tube with the recovered heat, and heats the fluid to the outside such as a boiler. Supply to equipment (not shown).

On the upstream side portion and the downstream side portion of the first pipeline 13, an upstream side opening / closing valve (hereinafter referred to as an upstream valve) 17 and a downstream opening / closing valve (hereinafter referred to as a downstream side) capable of opening / closing the pipeline 13 can be opened / closed, respectively. A valve) 18 is provided. On the upstream side portion and the downstream side portion of the second pipeline 14, an upstream side opening / closing valve (hereinafter referred to as an upstream valve) 19 and a downstream opening / closing valve (hereinafter referred to as a downstream side) which enable the opening / closing of the pipeline 14 can be opened / closed, respectively. A valve) 20 is provided. The upstream valve 19 of the second pipeline 14 has a function of adjusting the degree of opening (hereinafter, referred to as an opening degree) of the second pipeline 14 in addition to the function of opening and closing the second pipeline 14.

Therefore, the exhaust gas of the engine 11 flows in the first pipeline 13 in the open state of the upstream valve 17 and the downstream valve 18 of the first pipeline 13. Further, the exhaust gas of the engine 11 flows in the second pipeline 14 in the open state of the upstream valve 19 and the downstream valve 20 of the second pipeline 14. Then, the exhaust gas in the first and second pipelines 13 and 14 flows in the merging pipeline 15, and the exhaust heat is recovered by the exhaust gas economizer 16 and discharged to the outside. Further, the amount of exhaust gas flowing in the second pipeline 14 is adjusted according to the degree of opening of the upstream valve 19.

Then, as will be described later, when denitration of the exhaust gas is usually carried out, the exhaust gas is flowed through the second pipeline 14. If denitration is not performed, the second pipeline 14 is blocked and the exhaust gas flows into the first pipeline 13.

In the second pipeline 14, a denitration catalyst (hereinafter referred to as a catalyst) 21 for denitrifying nitrogen oxides in the exhaust gas by a reduction reaction is formed in a portion between the upstream valve 19 and the downstream valve 20. Is provided. The catalyst 21 exhibits an effective catalytic function at a temperature of, for example, 280 to 300 ° C. The temperature at which this effective catalytic function is exhibited is defined as the decomposition effective temperature. The effective decomposition temperature varies depending on the material and shape of the catalyst 21, but in the present embodiment, as described above, the catalyst 21 having an effective decomposition temperature of 280 to 300 ° C. is used. A reducing agent supply nozzle (hereinafter, simply referred to as a supply nozzle) 22 is arranged in the second pipeline 14 between the catalyst 21 and the upstream opening / closing valve 19. Then, by the action of the pump 23, ammonia water or urea water as a reducing agent is sprayed from the supply nozzle 22 onto the catalyst 21.

In the second pipeline 14, a heating unit 30 is interposed between the supply nozzle 22 and the upstream valve 19.
The heating unit 30 includes a burner device 31 and a mixer 37. The burner device 31 includes a combustion chamber 32 in which a combustion space is formed, and a burner 33 located upstream of the combustion chamber 32. The burner 33 burns heavy fuel oil A as fuel in the combustion chamber 32. A combustion air supply line 34 is connected to the combustion chamber 32, and outside air is supplied to the combustion chamber 32 as combustion air by the blower 35 via the combustion air supply line 34. The combustion temperature in the combustion chamber 32 is a temperature exceeding 1000 ° C. in a region where the combustion temperature is high. The mixer 37 is interposed in the second pipeline 14 and is connected to the opening of the combustion chamber 32, and the combustion gas generated by the combustion in the combustion chamber 32 is supplied to the primary side of the mixer 37.

The fuel of the burner 33 is not limited to A heavy oil, and may be any of light oil, B heavy oil, C heavy oil, or gas fuel.
A mixed air introduction pipe 36 is connected to the primary side of the mixer 37, and outside air (air) is directly introduced into the primary side of the mixer 37 by the blower 35 via the mixed air introduction pipe 36. The mixed air introduction pipe 36 is arranged so as to pass through the outside of the outer wall of the combustion chamber 32. The outside air introduction means is composed of the mixed air introduction pipe 36 and the blower 35. Then, the combustion gas from the combustion chamber 32 and the outside air from the mixed air introduction pipe 36 are mixed in the mixer 37 and supplied as heating gas from the secondary side of the mixer 37 into the second pipe 14. ..

In addition to the burner device 31 and the mixer 37, the combustion air supply line 34 and the mixed air introduction line 36 constitute the heating unit 30.
In the combustion air supply pipe 34 and the mixed air introduction pipe 36, the pipes 34 and 36 are opened and closed, respectively, and the opening adjustment valves 38 and 39 for adjusting the opening degrees of the pipes 34 and 36, respectively. Is provided.

A temperature sensor 41 is provided on the upstream side of the supply nozzle 22 in the second pipeline 14.
The control device 45 shown in FIG. 2 operates the actuators (not shown) of the valves 17 to 20, 38, 39 and the pump 23 based on the temperature detected by the temperature sensor 41, a preset program, and the like. To control. In FIG. 2, electrical components such as the sensor 42, valves 48, 53, 55, 59 and the fan 52 in other embodiments described later are also shown.

Next, the operation of the first embodiment configured as described above will be described.
When the engine 11 is in operation, the upstream valve 17 and the downstream valve 18 of the first pipeline 13 are opened, and the upstream valve 19 and the downstream valve 20 of the second pipeline 14 are closed. , The exhaust gas of the engine 11 reaches the exhaust gas economizer 16 through the first pipe line 13. Then, the exhaust heat of the exhaust gas is recovered by the exhaust gas economizer 16 and discharged to the outside.

Further, in a state where the upstream valve 19 and the downstream valve 20 of the second pipeline 14 are opened, the exhaust gas flows in the second pipeline 14. At the same time, the reducing agent is sprayed from the supply nozzle 22 onto the catalyst 21 on the downstream side thereof. Therefore, in the catalyst 21, a reduction reaction is expressed, NOx in the exhaust gas is decomposed into nitrogen and water, and the exhaust gas is purified. The purified exhaust gas reaches the exhaust gas economizer 16 in the same manner as described above, and the exhaust heat is recovered and discharged to the outside.

At this time, the burner device 31 of the heating unit 30 can be operated for combustion. Therefore, the outside air sent by the blower 35 to the combustion chamber 32 through the combustion air supply pipe 34 is heated by combustion, and the combustion gas is sent to the mixer 37. At the same time, the blower 35 sends the outside air to the mixer 37 via the mixed air introduction pipe 36. Therefore, in the mixer 37, the combustion gas and the outside air are mixed to generate a high-temperature heating gas, and this heating gas is supplied into the second pipeline 14 from the secondary side of the mixer 37.

That is, the combustion operation of the burner device 31 of the heating unit 30 is performed when the exhaust gas temperature is low or the function of the catalyst 21 is deteriorated. On the other hand, for example, in order to temporarily increase the exhaust heat recovered by the exhaust gas economizer 16, the operation of the engine side may be controlled to raise the exhaust gas temperature. In such a case, the burner device 31 The operation of the device 31 may be stopped because the operation becomes unnecessary.

When the burning operation of the burner device 31 of the heating unit 30 is performed, the temperature of the mixed gas is adjusted so that the catalyst 21 has an effective decomposition temperature based on the temperature detection from the temperature sensor 41. That is, the detection signal by the temperature sensor 41 is input to the control device 45, and the control device 45 controls the burner 33 and adjusts the fuel flow rate according to the level of the detection signal to determine the degree of combustion in the combustion chamber 32 and the degree of combustion. The opening degree of the opening degree adjusting valves 38 and 39 is adjusted. Therefore, a heating gas having a temperature level for bringing the catalyst 21 to the effective decomposition temperature is formed in the mixer 37 and supplied into the second pipeline 14. As a result, the catalyst 21 is maintained at the effective decomposition temperature. Therefore, the reduction reaction is appropriately expressed with respect to the exhaust gas generated by the operation of the engine 11, and the exhaust gas is purified.

The operation of the embodiment will be described in more detail below.
If the temperature of the exhaust gas is low and the catalyst 21 does not reach the effective decomposition temperature at the time of starting the engine 11, the reduction reaction may not be sufficiently performed and the nitrogen oxides may not be sufficiently decomposed. In such a case, the preheating operation for applying the catalyst 21 is executed.

In the preheating of the catalyst 21 when the engine 11 is stopped, the upstream valve 17 and the downstream valve 18 of the first pipeline 13 are closed based on the temperature detection from the temperature sensor 41. Further, the upstream valve 19 of the second pipeline 14 is closed, and the downstream valve 20 is opened. In this state, the opening degree adjusting valve 38 of the combustion air supply line 34 and the opening degree adjusting valve 39 of the mixed air introduction line 36 are appropriately opened, and the burner device 31 of the heating unit 30 is operated for combustion. .. Therefore, the outside air (air) sent to the combustion chamber 32 through the combustion air supply pipe 34 by the blower 35 and the fuel are mixed to form a flame, and the high-temperature combustion gas is sent to the mixer 37. At the same time, the blower 35 directly sends the outside air to the mixer 37 via the mixed air introduction pipe 36. Therefore, in the mixer 37, the combustion gas and the outside air are mixed, and the heating gas, which is a high-temperature mixed gas having a required temperature, is supplied into the second pipeline 14 from the secondary side of the mixer 37. At this time, the spraying of the reducing agent from the supply nozzle 22 is not executed.

Then, in the supply of the heating gas, the temperature of the heating gas is adjusted so that the catalyst 21 has the effective decomposition temperature based on the temperature detection from the temperature sensor 41. Therefore, a detection signal by the temperature sensor 41 is input to the control device 45, and the control device 45 controls the burner 33 according to the level of the detection signal to control the fuel flow rate and the opening degree adjusting valve 38 in the combustion chamber 32. Adjust the opening degree of 39. Therefore, a heating gas having a temperature level at which the catalyst 21 has an effective decomposition temperature is formed in the mixer 37 and supplied into the second pipeline 14. As a result, the temperature of the catalyst 21 is raised to the effective decomposition temperature, and the exhaust gas is appropriately purified.

In the preheating operation of the catalyst 21 during engine operation such as when the engine 11 is started, the upstream opening / closing valve 17 and the downstream opening / closing valve 18 of the first pipeline 13 are opened. Further, the downstream valve 20 is opened to an appropriate intermediate opening between fully open and fully closed, for example, an opening of 20 to 30%, of the upstream valve 19 of the second pipeline 14.

When the engine 11 is operated in this state, most of the exhaust gas flows in the first pipeline 13 and the remaining portion flows in the second pipeline 14. Then, in this state, the burner device 31 is combusted as described above, and outside air is introduced from the mixed air introduction pipe 36 to supply the mixed gas to the second pipe 14. In this case, since the exhaust gas from the engine 11 flows in the second pipeline 14, the amount of outside air introduced from the mixed air introduction pipeline 36 can be reduced. Therefore, the amount of combustion in the combustion chamber 32 can be reduced, and the amount of fuel consumed for preheating can be reduced.

Then, when the catalyst 21 reaches the effective decomposition temperature due to continuous operation of the engine 11, the operation of the heating unit 30 is stopped.
When the reducing agent is supplied from the supply nozzle 22 to the catalyst 21 for a long period of time due to the long-term operation of the engine 11, impurities such as precipitated acidic ammonium sulfate gradually adhere to the catalyst 21 to cause the catalyst. The surface of 21 may be covered with impurities. In particular, when the denitration operation is performed without the burner device 31 being burned, the denitration efficiency of the catalyst 21 gradually decreases due to the adhesion of impurities. Therefore, in such a case, the function of the catalyst 21 can be regenerated by decomposing the impurities on the catalyst 21 by the operation of the heating unit 30 as described below.

That is, the upstream valve 19 of the second pipeline 14 is closed, the downstream valve 20 is opened, the burner device 31 is operated for combustion, and the outside air is introduced from the mixed air introduction pipeline 36. 2 The heating gas is supplied to the pipeline 14. At this time, the fuel flow rate in the burner 33 and the combustion air supply line 34 and the mixed air introduction line 36 are set so that the catalyst 21 has a temperature higher than the effective decomposition temperature at the time of purifying the exhaust gas, for example, 350 to 380 ° C. The opening degree of the opening degree adjusting valves 38 and 39 is adjusted. In this way, a high-temperature heating gas is sent into the second pipeline 14, and the heating gas thermally decomposes impurities such as acidic ammonium sulfate and SOF on the catalyst 21, so that the catalyst 21 can be cleaned and regenerated. , The exhaust gas purification function of the catalyst 21 can be restored.

Further, the decomposition of impurities on the catalyst 21 can also be performed during the operation of the engine 11. In this case, the opening degree of the upstream valve 19 of the second pipeline 14 is set to an intermediate opening degree, for example, an opening degree of about 20 to 30%, and the other valves 17, 18 and 20 are opened. When the engine 11 is operated in this state, most of the exhaust gas flows in the first pipeline 13 and the remaining portion flows in the second pipeline 14. At this time, the burner device 31 is combusted and the outside air is introduced through the mixed air introduction pipe 36 to allow the catalyst 21 to flow a heating gas having a decomposition effective temperature suitable for decomposition of impurities. And the catalyst 21 can be regenerated. In this case, since the catalyst 21 is heated by the heating gas to a decomposition effective temperature suitable for decomposition of impurities, for example, 350 to 380 ° C., the SOF derived from the fuel oil and the lubricating oil contained in the exhaust gas is not present. It evaporates sufficiently and becomes a gaseous state. Therefore, the SOF does not adhere to the PM and can prevent the PM from adhering to the surface of the catalyst 21.

If the temperature of the exhaust gas in the second pipeline 14 rises abnormally for some reason, the low temperature outside air enters the second pipeline 14 from the mixed air introduction pipeline 36 without operating the burner device 31. By introducing the above, the temperature in the second pipeline 14 can be lowered, and the equipment such as the catalyst 21 can be prevented from being damaged.

Therefore, in the first embodiment, there are the following effects.
(1) Even when the engine 11 is stopped or the temperature of the exhaust gas from the engine 11 is low, the burner device 31 is combusted and the outside air is introduced from the mixed air introduction pipeline 36. As a result, the temperature of the catalyst 21 can be raised to the effective decomposition temperature at which the catalytic function is exhibited by the heating gas. Therefore, NOx in the exhaust gas can be reduced, and the exhaust gas can be appropriately purified.

(2) In order to preheat and regenerate the catalyst 21 when the engine 11 is started, it is possible to reduce fuel consumption by mixing a part of the exhaust gas from the second pipeline 14 with the outside air to make it a heating gas. it can.

(3) By burning the burner device 31 even when the engine 11 is stopped, the exhaust gas temperature is low even when the engine 11 is operating, or even when the engine is operating normally. A heating gas having a temperature higher than that of the exhaust gas can be supplied to the catalyst 21. Therefore, the impurities adhering to the catalyst 21 can be thermally decomposed, and the function of the catalyst 21 can be regenerated.

(4) The combustion gas from the burner device 31 and the outside air from the mixed air introduction pipe 36 can be mixed by the mixer 37. Therefore, the heating gas having an even temperature distribution can be supplied into the second pipeline 14, and the function of the catalyst 21 can be maintained satisfactorily.

(5) Since the outer wall of the combustion chamber 32 can be cooled by the outside air flowing in the mixed air introduction pipe 36 outside the combustion chamber 32, overheating of the combustion chamber 32 can be avoided, and the durability of the combustion chamber 32 and its peripheral equipment can be avoided. Can improve sex.

(6) When the temperature of the exhaust gas rises abnormally, the temperature of the exhaust gas is immediately lowered by the outside air introduced from the mixed air introduction pipe 36, and the abnormal rise in the exhaust gas temperature can be avoided to avoid damage to the equipment. ..

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In each of the embodiments and modifications after the second embodiment, the parts different from the first embodiment will be mainly described.

In the second embodiment, the following configuration is added to the configuration of the first embodiment shown in FIG.
As shown in FIG. 3, the reflux line 51 is branched from the portion between the catalyst 21 and the downstream valve 20 in the second line 14. The return pipe 51 is connected to the downstream side of the opening degree adjusting valve 38 in the mixed air introduction pipe 36. The return pipe 51 is provided with a fan 52 and an on-off valve 53 shown in FIG.

Then, during the operation of the engine 11, a part of the exhaust gas containing the heating gas on the downstream side of the catalyst 21 is operated by operating the fan 52 while the opening / closing valve 53 of the reflux pipe 51 is open. Can be sent from the reflux line 51 to the primary side of the mixer 37. If the fan 52 can block the flow of gas in the return pipe 51 when the fan 52 is stopped, the on-off valve 53 is not always necessary.

Therefore, in the second embodiment, although the temperature of the exhaust gas is lowered to some extent by passing through the catalyst 21, the exhaust gas having a temperature higher than that of the outside air (usually about 200 to 250 ° C.) is discharged from the reflux pipe 51. A part of the catalyst can be recovered and supplied to the upstream side of the catalyst 21. Therefore, the amount of combustion in the combustion chamber 32 can be reduced, and fuel consumption can be reduced.

Further, if the upstream valve 19 of the second pipeline 14 is closed, the downstream valve 20 is opened to perform the combustion operation of the heating unit 30, and the outside air is introduced from the mixed air introduction pipeline 36, the decomposition is performed. A heating gas heated to a temperature higher than the effective temperature is supplied to the catalyst 21 side for regeneration of the catalyst 21. Then, a part of the heating gas that has passed through the catalyst 21 can be refluxed to the heating unit 30 via the reflux pipe 51 to be used for regeneration of the catalyst 21.

Therefore, in the second embodiment, in addition to the effects of the first embodiment, there are the following effects.
(7) A part of the gas on the downstream side of the catalyst 21 can be refluxed into the second pipeline 14 on the upstream side of the catalyst 21 to be used for raising the temperature of the catalyst 21. Therefore, the amount of outside air introduced from the mixed air introduction pipe 36 can be reduced, and the amount of combustion in the burner device 31 can be reduced. Therefore, the fuel consumption required for raising the temperature and maintaining the temperature of the catalyst 21 can be reduced.

(8) In the regeneration of the catalyst 21, a part of the high-temperature gas used for the regeneration can be refluxed to the upstream side of the catalyst 21 and reused for the regeneration of the catalyst 21, so that the fuel consumption required for the regeneration of the catalyst 21 is required. Can be reduced.

(Third Embodiment)
Next, a third embodiment of the present invention will be described.
The third embodiment is obtained by adding the following configuration to the configuration of the second embodiment shown in FIG.

As shown in FIG. 4, in the third embodiment, the temperature sensor 42 shown in FIG. 2 is provided in the merging pipeline 15. Further, a bypass line 54 is branched from the mixer 37, and this bypass line 54 is connected to the merging line 15. An on-off valve 55 shown in FIG. 2 is provided in the bypass pipeline 54.

Then, when the temperature of the exhaust gas detected by the temperature sensor 42 is low, the opening / closing valve 55 of the bypass pipe 54 is opened. When the on-off valve 55 is opened, the heating gas, which is a high-temperature mixed gas from the mixer 37, is supplied to the merging line 15 via the bypass line 54. In this case, the temperature of the heating gas supplied to the bypass pipeline 54 is set to a temperature equal to or higher than the temperature of the heating gas supplied from the mixer 37 into the second pipeline 14. Then, the bypass flow is mixed with the exhaust gas in the merging pipeline 15 and supplied to the exhaust gas economizer 16 as a gas having a temperature higher than that of the exhaust gas.

Therefore, the acid ammonium sulfate precipitated by the reaction between NH3 due to urea or ammonia slip and the sulfuric acid gases SO2 and SO3 contained in the exhaust gas and water can be thermally decomposed on the exhaust gas economizer 16. Further, since it is possible to prevent the SOF derived from the fuel or the lubricating oil from sticking to the PM in the merging pipeline 15, it is possible to prevent the PM and the like from adhering to the exhaust gas economizer 16.

Even when the engine 11 is stopped or when the exhaust gas flows in the first pipeline 13, impurities such as acidic sulfuric acid can be removed by closing the upstream valve 19 and the downstream valve 20 of the second pipeline 14. A heating gas having a decomposable temperature can be supplied to the exhaust gas economizer 16 via the bypass pipe 54. In this case, the amount of the heating gas is sufficient to decompose impurities on the exhaust gas economizer 16, so that the amount of combustion in the burner device 31 can be reduced.

Therefore, in the third embodiment, in addition to the effects of the second embodiment, there are the following effects.
(9) When the heating unit 30 is combusted, the high-temperature heating gas from the mixer 37 is supplied to the merging pipe 15 via the bypass pipe 54 regardless of whether the engine 11 is stopped or operated. Therefore, even if impurities such as acidic ammonium sulfate adhere to the outer peripheral surface of the heat transfer tube of the exhaust gas economizer 16, the impurities can be thermally decomposed. Further, since the high-temperature heating gas from the bypass pipe 54 makes it possible to prevent the SOF from sticking to the PM in the exhaust gas, it is possible to prevent the precipitation of impurities on the exhaust gas economizer 16 due to PM or the like. Therefore, it is possible to reduce the flow path resistance of the exhaust gas economizer 16 and effectively prevent the deterioration of the heat recovery function.

(10) When the exhaust gas temperature from the engine 11 is low and the exhaust heat recovery function of the exhaust gas economizer 16 deteriorates, the exhaust heat recovery function is restored by burning the heating unit 30 and reheating it, so to speak. It becomes possible to make it.

(Fourth Embodiment)
Next, a fourth embodiment of the present invention will be described.
In the fourth embodiment, the following configuration is added to the configuration of the first embodiment shown in FIG.

As shown in FIG. 5, the downstream portion of the upstream opening / closing valve 19 in the second pipeline 14 is connected to the combustion space of the combustion chamber 32 of the burner device 31. The combustion chamber 32 is formed in a cylindrical shape, and the burner 33 is arranged at one end thereof. The second pipeline 14 is connected to the combustion chamber 32 at the other end of the combustion chamber 32 so as to direct a direction substantially orthogonal to the axis of the combustion chamber 32. Therefore, the exhaust gas in the second pipeline 14 flows in the direction intersecting the combustion gas flow at the other end of the combustion chamber 32.

The mixed air introduction pipe line 36 is arranged outside the outer wall 321 of the combustion chamber 32 so that the combustion chamber 32 is cooled by the outside air.
When the engine 11 is in operation, the exhaust gas is sent into the combustion chamber 32, and the exhaust gas undergoes a combustion action in the combustion chamber 32.

Therefore, in the fourth embodiment, in addition to the effects of the first embodiment, there are the following effects.
(11) Exhaust gas from the engine 11 is sent into the combustion chamber 32, and PM, SOF and CO containing unburned components in the exhaust gas pass through the tip portion in the combustion chamber 32, that is, a high temperature region. SOF, CO, etc. can be appropriately pyrolyzed or burned. Therefore, it is possible to effectively prevent impurities such as PM from adhering to the heat transfer tube of the catalyst 21 and the exhaust gas economizer 16 and the impurities and CO from being released into the atmosphere.

(12) Since the exhaust gas from the upstream side of the second pipeline 14 passes through the combustion chamber 32 in a short distance in the radial direction, it is possible to suppress an increase in the flow resistance of the exhaust gas, and the engine 11 It is possible to increase the distribution efficiency of exhaust gas, which is related to the operating efficiency of. As a result, the operating efficiency of the engine 11 can be improved.

(Fifth Embodiment)
Next, a fifth embodiment of the present invention will be described.
The fifth embodiment is obtained by adding the following configuration to the configuration of the fourth embodiment shown in FIG.

As shown in FIG. 6, in the second pipeline 14, a reflux conduit 51 similar to that of the third embodiment shown in FIG. 4 is branched from the portion between the catalyst 21 and the downstream valve 20, and the reflux conduit 51 is branched. 51 is connected to the combustion chamber 32 via the second pipe line 14. The return pipe 51 is provided with a fan 52 and an on-off valve 53. Then, when the engine 11 is operated, the valves 19 and 20 of the second pipeline 14 are opened. In this state, the fan 52 of the recirculation pipe 51 is operated, and the valve 53 is opened, so that impurities such as acidic sulfurous acid that have passed through the catalyst 21 or a part of the exhaust gas containing PM, SOF, and CO are removed. It is sent to the combustion chamber 32 via the recirculation pipe 51 and is thermally decomposed or burned in the combustion chamber 32.

Therefore, in the fifth embodiment, in addition to the effects of the fourth embodiment, there are the following effects.
(13) Since some of the impurities such as acidic sulfur, PM, unburned fuel, and SOF that have passed through the catalyst 21 are thermally decomposed or burned in the combustion chamber 32, the acidic economizer 16 reaches the exhaust gas economizer 16, and so on. The amount of the exhaust gas economizer 16 can be reduced, and the efficiency decrease of the exhaust gas economizer 16 can be suppressed.

(14) Since a part of the exhaust gas in the second pipeline 14 can be returned to the combustion chamber 32, the amount of combustion in the combustion chamber 32 can be reduced and the fuel efficiency can be improved.
(Sixth Embodiment)
Next, a sixth embodiment of the present invention will be described.

The sixth embodiment is obtained by adding the following configuration to the configuration of the fifth embodiment shown in FIG.
As shown in FIG. 7, in the sixth embodiment, the bypass pipe 54 is branched from the mixer 37, and the bypass pipe 54 is connected to the merging pipe 15 as in the third embodiment shown in FIG. Has been done. The bypass pipeline 54 is provided with an on-off valve 55. A temperature sensor 42 is provided in the merging pipeline 15.

Therefore, in the sixth embodiment, there are the following effects.
(15) By opening the on-off valve 55 of the bypass pipe 54 based on the temperature detection by the temperature sensor 42, a high-temperature heating gas can be supplied to the upstream side of the exhaust gas economizer 16, as in the third embodiment. , It is possible to prevent the adhesion of impurities to the heat transfer tube of the exhaust gas economizer 16.

(16) Similar to the third embodiment, when the exhaust gas temperature from the engine 11 is low and the exhaust heat recovery function of the exhaust gas economizer 16 is lowered, the heating unit 30 is combusted and reheated. It is possible to restore the exhaust heat recovery function.

Next, a seventh embodiment of the present invention will be described.
The seventh embodiment is the fifth embodiment shown in FIG. 6 with the following configuration added to the configuration.

As shown in FIG. 8, the heating unit 30 is provided with a filter 47 on the secondary side of the mixer 37. The filter 47 is for capturing impurities such as PM composed of carbon fine particles, unburned fuel, sulfur and the like. A part of the mixed air introduction pipe 36 communicates with the primary side of the mixer 37, and the other part directly connects to the second pipe 14 through the outer surfaces of the mixer 37 and the filter 47.

Further, in the seventh embodiment, the fuel flow rate and the mixed air introduction pipeline 36 are set so that the temperature inside the filter 47 becomes a high temperature at which impurities such as PM are decomposed or burned, for example, 600 to 650 ° C. The amount of outside air supplied from is set. Then, the temperature of the heating gas in the second pipeline 14 is adjusted to be the effective decomposition temperature of the catalyst 21 by mixing the heating gas that has passed through the filter 47 with the outside air from the mixed air introduction pipeline 36.

Therefore, in the seventh embodiment, the filter 47 captures PM and the like contained in the exhaust gas from the engine 11 and has not been burned in the combustion chamber 32, and decomposes them by the heating gas generated by mixing the combustion chamber 32 and the outside air. Or it can be burned.

In the seventh embodiment, there are the following effects.
(17) Since impurities such as PM can be captured by the filter 47 and decomposed or burned, the amount of impurities adhering to the catalyst 21 and the exhaust gas economizer 16 can be reduced, and the catalyst 21 and the exhaust gas economizer 16 can be reduced. It is possible to suppress a decrease in efficiency of the exhaust gas economizer 16.

(8th Embodiment)
Next, an eighth embodiment of the present invention will be described.
The eighth embodiment is a system in which a plurality of engines 11 are provided, and the following configuration is added to the fifth embodiment shown in FIG.

As shown in FIG. 9, an engine unit 49 including an engine 11, a first pipeline 13, a second pipeline 14, and an exhaust gas economizer 16 is configured, and a plurality of engine units 49 are arranged side by side.

The heating unit 30 has a single configuration shared by a plurality of engine units 49.
Then, the primary side of the common chamber 50 is connected to the secondary side of the mixer 37 of the heating unit 30, and the secondary side of the common chamber 50 is the upstream side of the second pipeline 14 of each engine unit 49 via the connection pipeline 46. It is connected to the portion between the valve 19 and the catalyst 21. The common room 50 is provided with a supply nozzle 22 connected to a pump 23 for supplying the reducing agent, and the reducing agent is sprayed into the common room 50. The supply nozzle 22 is not provided in the second pipeline 14. The connecting pipeline 46 is provided with a valve 48 as shown in FIGS. 2 and 9.

The return pipe 51 of each engine unit 49 is assembled at a portion between the fan 52 and the on-off valve 53.
Therefore, in the eighth embodiment, the reducing agent sprayed from the supply nozzle 22 in the common chamber 50 is supplied to the catalyst 21 of each engine unit 49 via the connecting pipe 46. Further, a part of the exhaust gas on the downstream side of the catalyst 21 of each engine unit 49 is supplied to the combustion chamber 32 via the reflux pipe 51.

Therefore, in the eighth embodiment, there are the following effects.
(18) Since a single heating unit 30 is shared for a plurality of engine units 49, even if there are a plurality of engine units 49, the overall configuration can be made compact and the overall configuration can be avoided from becoming complicated. ..

(9th Embodiment)
Next, a ninth embodiment of the present invention will be described.
In the ninth embodiment, the position of the heating unit 30 is changed with respect to the first embodiment shown in FIG.

As shown in FIG. 10, in the ninth embodiment, unlike each of the above-described embodiments, the heating unit 30 is not provided in the second pipeline 14, and the merging pipeline 15 is the same as in the first embodiment. Heating unit 30 is connected. Therefore, the primary side of the mixer 37 communicates with the secondary side of the catalyst 21, and the secondary side of the mixer 37 communicates directly with the primary side of the exhaust gas economizer 16 without passing through the catalyst 21. Further, the mixed air introduction pipe 36 of the heating unit 30 communicates with the primary side of the mixer 37 via the merging pipe 15.

Therefore, in the ninth embodiment, not only during the operation of the engine 11, but also when the engine 11 is stopped, the acid ammonium sulfate on the exhaust gas economizer 16 generated by ammonia slip or the like due to the heating gas from the heating unit 30 is generated. Impurities such as can be thermally decomposed.

Therefore, in the ninth embodiment, there are the following effects.
(19) Even when the engine 11 is stopped, impurities such as acidic sulfur in the exhaust gas economizer 16 can be thermally decomposed by the heating gas from the heating unit 30, and the exhaust gas economizer 16 can be maintained in a highly efficient state.

(20) Similar to the third embodiment, the exhaust heat recovery function of the exhaust gas economizer 16 can be restored by burning and reheating the heating unit 30. In particular, in the ninth embodiment, the heating unit 30 is arranged close to the exhaust gas economizer 16 without using the catalyst 21. Therefore, the recovery of the exhaust heat recovery function becomes more reliable.

(10th Embodiment)
Next, a tenth embodiment of the present invention will be described.
In the tenth embodiment, the following configuration is added to the configuration of the ninth embodiment shown in FIG.

As shown in FIG. 11, in the second pipeline 14, another mixer 57 different from the mixer 37 is connected to the portion between the upstream valve 19, the temperature sensor 41, and the supply nozzle 22. A branch line 58 is branched from the mixer 37 on the heating unit 30 side, and the branch line 58 is connected to the primary side of the other mixer 57. As shown in FIGS. 2 and 11, the branch line 58 is provided with an on-off valve 59 and a fan 60.

Then, when the on-off valve 59 is opened, the high-temperature heating gas is supplied from the mixer 37 to another mixer 57 via the branch pipeline 58, and the heating gas is combined with the exhaust gas from the engine 11 in the second pipeline 14. Be mixed. The temperature of the mixing gas, which is the heating gas, is about 280 to 300 degrees Celsius. Then, the mixing gas flows as a heating gas to the supply nozzle 22 and the catalyst 21 side, and the catalyst 21 is maintained at the effective decomposition temperature.

When the amount of impurities adhering to the catalyst 21 increases, the proportion of low-temperature outside air is reduced and a higher-temperature heating gas is sent through the branch pipeline 58 to increase the amount of impurities on the catalyst 21. Can be thermally decomposed.

Therefore, in the tenth embodiment, in addition to the effect of the ninth embodiment, there are the following effects.
(21) Since the high-temperature mixing gas can be supplied as a heating gas to the upstream side of the catalyst 21 and mixed with the exhaust gas, the gas supplied to the catalyst 21 can be raised even when the exhaust gas is low at the time of starting the engine or the like. It can be warmed and an appropriate reducing action can be obtained in the catalyst 21. Further, by sending a heating gas from the mixer 37 to another mixer 57 to raise the temperature of the catalyst 21, impurities such as acidic ammonium sulfate on the catalyst 21 can be decomposed.

(11th Embodiment)
Next, the eleventh embodiment of the present invention will be described.
As shown in FIG. 12, in the eleventh embodiment, the heating unit 30 of the fourth embodiment shown in FIG. 5 is connected to the merging pipe line 15 with respect to the configuration of the ninth embodiment shown in FIG. is there. Therefore, if the burner device 31 of the heating unit 30 is operated for combustion, impurities on the exhaust gas economizer 16 can be decomposed even when the engine 11 is stopped.

Therefore, in the eleventh embodiment, there are the following effects.
(22) Impurities such as PM composed of carbon fine particles contained in the exhaust gas and CO can be burned in the combustion chamber 32, and impurities on the exhaust gas economizer 16 can be decomposed regardless of whether the engine 11 is started or stopped.

(12th Embodiment)
Next, the twelfth embodiment of the present invention will be described.
As shown in FIG. 13, in the twelfth embodiment, the following configuration is added to the configuration of the eleventh embodiment shown in FIG. That is, in the twelfth embodiment, with respect to the configuration of the eleventh embodiment, as in the tenth embodiment shown in FIG. 11, another mixer 57 is provided on the second pipeline 14, and the mixer 37, A branch line 58 having an on-off valve 59 and a fan 60 is connected between 57.

Therefore, in the twelfth embodiment, there are the following effects.
(23) Although impurities such as PM and CO in the exhaust gas can be burned in the combustion chamber 32, the catalyst 21 can be regenerated by the combustion gas from the combustion chamber 32, and the impurities on the exhaust gas economizer 16 can be decomposed.

(Change example)
The present invention is not limited to each of the above-described embodiments, and can be embodied in the following aspects.

-As shown in FIG. 14, the upstream valve 19 of the second pipeline 14 is provided on the downstream side of the confluence of the second pipeline 14 and the mixed air introduction pipeline 36. In other words, the upstream valve 19 is provided in the mixed air introduction line 36. Therefore, the mixed air introduction pipe 36 constitutes a part of the second pipe 14. Even with such a configuration, the same operation as that of each of the above-described embodiments can be obtained.

-For example, in the first embodiment, as shown by the alternate long and short dash line, the second conduit 14 is directly connected to the upstream side of the catalyst 21 without passing through the mixer 37. In this configuration, the exhaust gas is not supplied to the primary side of the mixer 37, and the heating gas is mixed with the exhaust gas on the secondary side of the mixer 37 and supplied into the second pipeline 14.

The mixer 37 for mixing the combustion gas from the combustion chamber 32 of the burner device 31 and the outside air from the mixed air introduction pipe 36 is omitted. In this case, the outlet of the combustion chamber 32 and the mixed air introduction pipe 36 are merged, the pipe extending from the merging portion is sufficiently long, and the pipe is connected to the second pipe 14. In this way, the combustion gas and the outside air are appropriately mixed in the pipeline extending from the confluence.

In the seventh embodiment shown in FIG. 8, another mixer is also provided on the downstream side of the filter 47 so that the gas from the filter 47 and the outside air are mixed by the mixer and supplied to the second pipeline 14. To do.

-In embodiments other than the seventh embodiment shown in FIG. 8, a filter for capturing PM and SOF made of carbon fine particles and the like is provided on the downstream side of the mixer 37.
-In each of the above embodiments, the upstream valve 19 has both a function of opening and closing the second pipeline 14 and a function of adjusting the opening degree of the second pipeline 14. On the other hand, as the upstream valve, a valve for opening and closing the second pipeline 14 and a valve for adjusting the opening degree of the second pipeline 14 are provided as single-function valves.

(Other technical ideas)
The technical ideas grasped from each of the above-described embodiments and modifications and not described in the claims are as follows.

(A) The heating means mixes the combustion gas in the burner device 31 with the outside air from the outside air introducing means 36, and the mixer 37 for sending the heating gas generated by the mixing to the exhaust gas path 100. The heating gas generator for the denitration device of the internal combustion engine according to claim 1 or 2.

In the above configuration, the combustion gas and the outside air can be mixed evenly and supplied to the exhaust gas path.
(B) Of claims 1 and 2, the technical idea (A), wherein the exhaust gas path 100 is provided with an on-off valve 19 for opening and closing the exhaust gas path 100 on the upstream side of the heating unit 30. The heating gas generator for the denitration device of the internal combustion engine according to any one of the above.

In the above configuration, when the opening / closing valve 19 is opened, the mixed air can be supplied to the exhaust gas, and when the opening / closing valve 19 is closed, only the mixed air can be supplied to the exhaust path.

(C) The opening / closing valve 19 is a heating gas generator for a denitration device of an internal combustion engine according to the technical concept (B), wherein the opening / closing valve 19 can adjust the opening degree of the exhaust gas path 100.
In the above configuration, an appropriate amount of exhaust gas can be flowed through the exhaust gas path 100, the combustion gas from the burner device 31 of the heating unit 30 can be reduced, and the fuel consumption in the burner device 31 can be reduced.

(D) A recirculation pipe 51 is provided between the denitration catalyst 21 and the exhaust heat recovery means 16 in the exhaust gas path 100 and the outside air introduction means 36, and the exhaust gas path 51 is provided in the recirculation pipe 51. In any one of claims 1 and 2 provided with a fan 52 for sending a part of the exhaust gas in 100 to the outside air introducing means 36 side, and the technical idea (A) and (B). The heating gas generator for the denitration device of the internal combustion engine described.

In the above configuration, by returning a part of the exhaust gas to the denitration catalyst 21, the temperature of the exhaust gas can be used to raise the temperature of the denitration catalyst 21, so that the fuel consumption in the burner device 31 of the heating unit 30 can be reduced. ..

(E) The technical technique in which the exhaust heat recovery means 16 is provided in the exhaust gas path 100, the bypass pipe line 54 is branched from the mixer 37, and the bypass pipe line 54 is connected to the primary side of the waste heat recovery means 16. The heating gas generator for the denitration device of the internal combustion engine according to the idea (A).

In the above configuration, since the exhaust heat recovery means 16 can be heated to a high temperature by the heating gas from the mixer 37, impurities in the exhaust heat recovery means 16 can be effectively decomposed.
(F) The denitration of the internal combustion engine according to any one of claims 1 and 2 and the technical ideas (A) to (E) in which the exhaust gas path 100 is connected to the combustion chamber 32 of the burner device 31. Heating gas generator for the device.

In the above configuration, impurities and CO in the exhaust gas can be decomposed or burned in the combustion chamber 32.
(G) The combustion chamber 32 is formed in a cylindrical shape, the burner 33 is arranged at one end of the combustion chamber 32, and the internal combustion engine 11 side and the catalyst 21 side of the exhaust gas path 100 are the other ends of the combustion chamber 32. The heating gas generator for a denitration device of an internal combustion engine according to the technical concept (F), which is opened in a section in a direction intersecting the axis of the combustion chamber 32.

In the above configuration, the exhaust gas can be appropriately heated in the combustion chamber 32, and the flow path resistance to the exhaust gas can be reduced.
(H) A recirculation pipe 51 is provided between the denitration catalyst 21 in the exhaust gas path 100, the portion of the exhaust heat recovery means 16 and the outside air introduction means 36, and the exhaust gas path 100 is provided in the recirculation pipe 51. The denitration of the internal combustion engine according to the technical idea (E), wherein a fan 52 for sending the exhaust gas from the outside air to the outside air introduction means 36 is provided, and the return pipe line 51 is connected to the internal combustion engine side of the exhaust gas pipe line 14. Heating gas generator for the device.

In the above configuration, the heat of the exhaust gas can be used to raise the temperature of the catalyst.
(I) The heated gas generator for a denitration device of an internal combustion engine according to the technical idea (A), wherein a fine particle trapping filter 47 is interposed between the mixer 37 and the exhaust gas path 100.

In the above configuration, impurities in the exhaust gas can be captured by the fine particle capturing filter 47 and decomposed on the filter 47.
(J) The mixed air introduction path 36 constituting the outside air introduction means is connected to the primary side of the mixer 37, and the mixed air introduction path 36 passes through the outside of the mixer 37 and the fine particle capture filter 47 to the exhaust gas path. The heating gas generator for the denitration device of the internal combustion engine according to the technical concept (I), which is connected to 100.

In the above configuration, the mixer 37 and the filter 47 can be cooled by the outside air.
(K) The heating gas generator for an internal combustion engine denitration device according to claim 1 or 2, wherein a plurality of exhaust gas paths 100 are arranged side by side and the heating unit 30 is shared by the plurality of exhaust gas paths 100.

In the above configuration, since the heating unit is shared, the entire device can be miniaturized and the configuration can be simplified.
(L) Generation of heating gas for the denitration device of the internal combustion engine according to the technical idea (E), wherein the heating unit 30 is provided in the exhaust gas path between the denitration catalyst 21 and the exhaust heat recovery means 16. apparatus.

In the above configuration, the temperature of the waste heat recovery means 16 can be raised, and impurities on the waste heat recovery means 16 can be decomposed.
(M) The mixer 57 was connected to the upstream side of the denitration catalyst 21 in the exhaust gas path 100, and the branch path 58 branched from the mixer 37 of the heating unit 30 was connected to the mixer 57 on the upstream side of the denitration catalyst 21. The heating gas generator for the denitration device of an internal combustion engine according to the technical concept (L).

In the above configuration, the heating gas from the mixer 37 of the heating unit 30 can be supplied to the mixer 57, and the denitration catalyst 21 can be heated by the heating gas.
(N) The heating gas generator for the denitration device of an internal combustion engine according to the technical concept (M), wherein the exhaust gas path 100 is connected to the combustion chamber 32 of the burner device 31.

In the above configuration, impurities and CO in the exhaust gas can be burned or decomposed in the combustion chamber 32.
(O) The combustion chamber 32 is formed in a cylindrical shape, the burner 33 is arranged at one end of the combustion chamber 32, and the internal combustion engine 11 side and the denitration catalyst 21 side of the exhaust gas path 100 are other than the combustion chamber 32. The heating gas generator for a denitration device of an internal combustion engine according to the technical concept (N), which is opened at an end toward a direction intersecting the axis of the combustion chamber 32.

With the above configuration, impurities and CO in the exhaust gas can be efficiently decomposed or burned.
(P) In the heating gas generator for the denitration device of the internal combustion engine 11 according to claim 1 or 2, the burner device 31 is operated during the operation of the internal combustion engine 11 to preheat or regenerate the denitration catalyst 21. How to operate a heating gas generator for a denitration device of an internal combustion engine.

Therefore, for example, when the internal combustion engine 11 is started, the denitration catalyst 21 can be preheated or regenerated.

11 ... Engine as an internal combustion engine, 12 ... Common pipeline, 13 ... First pipeline, 14 ... Second pipeline, 16 ... Exhaust gas economizer as exhaust heat recovery means, 19 ... Upstream opening / closing valve, 21 ... Denitration catalyst , 22 ... Supply nozzle, 30 ... Heating unit, 31 ... Burner device, 35 ... Blower as outside air introduction means, 36 ... Mixed air introduction pipeline as outside air introduction means, 45 ... Control device, 100 ... Exhaust gas path.

Claims (11)

A heating gas generator for an exhaust gas treatment device of an internal combustion engine that supplies heating gas to an exhaust gas treatment device provided in an exhaust gas path of an internal combustion engine.
A heating unit including a burner device for supplying combustion gas to the exhaust gas path on the upstream side of the exhaust gas treatment device, and
An outside air introducing means for introducing outside air for mixing with the combustion gas supplied from the burner device in the heating unit, and
A heating gas generator for an exhaust gas treatment device of an internal combustion engine, characterized in that the outside air introducing means includes an opening degree adjusting valve for adjusting the amount of outside air introduced. A heating gas generator for an exhaust gas treatment device of an internal combustion engine that supplies heating gas to an exhaust gas treatment device provided in an exhaust gas path of an internal combustion engine.
A heating unit including a burner device for supplying combustion gas to the exhaust gas path on the upstream side of the exhaust gas treatment device is provided.
A burner is arranged at one end of the combustion chamber of the burner device, and the burner is arranged at one end.
The exhaust gas path of the internal combustion engine is connected to the other end of the combustion chamber so that the exhaust gas crosses the high temperature region of the combustion chamber in a direction substantially orthogonal to the axis of the combustion chamber, and the exhaust gas path is connected to the combustion chamber. A heating gas generator for an exhaust gas treatment device of an internal combustion engine, characterized in that the exhaust gas of the internal combustion engine supplied from is supplied. The heating unit has
The heated gas generator for an exhaust gas treatment device of an internal combustion engine according to claim 2, further comprising an outside air introducing means for introducing outside air for mixing with the combustion gas discharged from the combustion chamber. The heating unit
Combustion gas that is arranged downstream of the burner device and the outside air introduction means, exhaust gas discharged from the exhaust gas path of the internal combustion engine, and outside air supplied from the outside air introduction means. The heating gas generator for the exhaust gas treatment device of an internal combustion engine according to claim 1 or 3, further comprising a mixer for mixing the above. The heating for the exhaust gas treatment device of an internal combustion engine according to any one of claims 1, 3 and 4, wherein a first temperature sensor is provided between the exhaust gas treatment device and the heating unit. Gas generator. The exhaust gas treatment of an internal combustion engine according to any one of claims 1 and 3 to 5, wherein the outside air supplied from the outside air introducing means passes through the outside of the outer wall of the combustion chamber of the burner device. Heating gas generator for the device. The heated gas generator for an exhaust gas treatment device for an internal combustion engine according to any one of claims 1 to 6, wherein the exhaust gas treatment device is an exhaust heat recovery device. A bypass exhaust gas path different from the exhaust gas path that branches from the exhaust gas path of the internal combustion engine and joins the exhaust gas path upstream of the heating unit.
The denitration device provided in the bypass exhaust gas path and
On the upstream side and the downstream side of the exhaust gas path, a first valve that shuts off from the bypass exhaust gas path,
A second valve that cuts off the exhaust gas path upstream and downstream of the bypass exhaust gas path,
Any one of claims 1 to 7, wherein a part of the exhaust gas heated from the heating unit is provided with a branched exhaust gas path that returns a part of the exhaust gas heated to the confluence of the bypass exhaust gas paths on the upstream side of the denitration device. The heated gas generator for the exhaust gas treatment device of the internal combustion engine according to the above. The heating gas generator for an exhaust gas treatment device for an internal combustion engine according to claim 8, further comprising a third valve that shuts off the heating unit and the confluence in the branched exhaust gas path. A fan arranged in the branched exhaust gas path and sending a mixed gas heated by the heating unit to the confluence of the branched exhaust gas path and the bypass exhaust gas path.
The claim is characterized by comprising a mixer arranged at the confluence, which mixes the mixed gas supplied by the fan with the exhaust gas discharged from the internal combustion engine of the bypass exhaust gas path and sends the mixed gas to the denitration device. 8 or the heating gas generator for the exhaust gas treatment device of the internal combustion engine according to claim 9. The exhaust gas treatment device for an internal combustion engine according to any one of claims 8 to 10, further comprising a second temperature sensor arranged in the bypass exhaust gas path between the confluence point and the denitration device. Heating gas generator for.

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