WO2021251230A1

WO2021251230A1 - Exhaust gas purification system and exhaust gas purification device

Info

Publication number: WO2021251230A1
Application number: PCT/JP2021/020965
Authority: WO
Inventors: 将大 ▲高▼橋; 和輝壽; 祐介本田
Original assignee: ヤンマーホールディングス株式会社
Priority date: 2020-06-09
Filing date: 2021-06-02
Publication date: 2021-12-16
Also published as: JPWO2021251230A1

Abstract

The present invention addresses the problem of providing an exhaust gas purification system and an exhaust gas purification device that purify exhaust gas by efficiently removing poisoning components therefrom. This exhaust gas purification system (1) is applicable to a gas consuming device (2) that consumes fuel gas and discharges exhaust gas, and is provided with: a desulfurizer (5) that houses therein a desulfurization agent for removing poisoning components contained in fuel gas; and an oxidation treatment device (6) that is disposed in an exhaust path (4) through which exhaust gas from the gas consuming device (2) is discharged, and houses therein an oxidation catalyst for oxidizing hazardous components contained in the exhaust gas having passed through the exhaust path (4). The exhaust gas purification system (1) is further provided with: a bypass path (7) which is branched from the exhaust path (4); and a switching part (8) which is disposed in the exhaust path (4) and which switches the discharge destination of exhaust gas from the oxidation treatment device (6) to the bypass path (7) during regeneration of the desulfurizer (5).

Description

Exhaust gas purification system and exhaust gas purification device

The present invention relates to an exhaust gas purification system and an exhaust gas purification device, which are provided with a desulfurizing device and an oxidation catalyst and purify the exhaust gas of a gas consuming device such as an engine that consumes fuel gas.

An exhaust gas purification system or an exhaust gas purification device is applied to a gas consumption device such as an engine that consumes fuel gas such as natural gas. The exhaust gas purification system or the exhaust gas purification device is equipped with a desulfurizer that adsorbs and removes toxic components such as sulfur compounds and an oxidation catalyst that oxidizes and removes harmful components such as hydrocarbons, and discharges from the gas consumption device. Purifies the exhaust gas that is produced.

For example, the exhaust gas purification device disclosed in Patent Document 1 is a gas consuming device that consumes a fuel gas containing a hydrocarbon and a sulfur compound, and an exhaust gas discharged from the gas consuming device is introduced to adsorb the sulfur compound in the exhaust gas. A desulfurizer containing a desulfurizing agent, a heating means for heating the desulfurizing agent, and a catalyst for oxidizing hydrocarbons and carbon monoxide in the desulfurized exhaust gas after the desulfurized exhaust gas discharged from the desulfurization device are introduced. It is equipped with a desulfurized oxidation treatment device.

Japanese Unexamined Patent Publication No. 2018-135808

In the desulfurizer, when a predetermined amount or more of the sulfur compound is adsorbed on the desulfurizing agent, the function of removing the sulfur compound deteriorates. Therefore, it is necessary to regenerate the desulfurizing agent by heating the desulfurizing agent to desorb the sulfur compound. When the desulfurizer is placed upstream of the oxidation catalyst in the exhaust gas emission direction as in the conventional exhaust gas purification device, fuel gas is supplied to the oxidation catalyst when the desulfurizer is regenerated, and it is generated in the oxidation treatment of the fuel gas. It is necessary to feed back the generated heat to the desulfurizer on the upstream side, which complicates the configuration. In addition, the sulfur compound desorbed during regeneration of the desulfurizer may flow to the oxidation catalyst and deteriorate the oxidation catalyst.

Furthermore, if a desulfurizer is placed downstream of the gas consuming device in the exhaust gas discharge direction as in the conventional exhaust gas purification device, high-temperature exhaust gas will be distributed to the desulfurizer. Since the desulfurizer is difficult to adsorb sulfur compounds contained in high-temperature exhaust gas, the efficiency of removing sulfur compounds may decrease. In addition, since it is necessary to provide a desulfurizing agent that can handle high temperatures, the cost of the desulfurizing device itself may increase. Further, in order to regenerate such a desulfurizing agent, it is necessary to raise the temperature of the desulfurizing agent to a higher temperature, for example, 500 degrees or more, so that the cost of a heating means such as a heater or a burner for heating the desulfurizing device becomes high. , The configuration may be complicated due to the installation of heating means.

Further, the exhaust gas purification device of Patent Document 1 includes a bypass short-circuited between the airway that supplies fuel gas to the gas consuming device and the airway that discharges exhaust gas from the gas consuming device so as to avoid the gas consuming device. ing. Then, when the fuel gas is introduced into the oxidation treatment device by bypass, the oxidation reaction heat of the fuel gas is generated, and the oxidation reaction heat is transferred to the desulfurization device to regenerate the desulfurization device. Alternatively, the exhaust gas purification device of Patent Document 1 heats the desulfurizer with a heating means such as a heater or a burner to regenerate it. However, if the exhaust gas purification device is provided with a bypass or a heating means such as a heater or a burner, the cost is high and the configuration may be complicated. In addition, the sulfur compound desorbed during regeneration of the desulfurizer may flow to the oxidation catalyst and deteriorate the oxidation catalyst.

As a result of the above, in the conventional exhaust gas purification device, the efficiency of purifying the exhaust gas is lowered due to the complicated configuration and deterioration of fuel efficiency.

An object of the present invention is to provide an exhaust gas purification system and an exhaust gas purification device that efficiently remove poisonous components and purify exhaust gas.

In order to solve the above problems, the exhaust gas purification system of the present invention is an exhaust gas purification system applied to a gas consuming device that consumes fuel gas and discharges exhaust gas, and removes poisonous components contained in the fuel gas. Oxidation treatment containing a desulfurizer containing a desulfurizing agent to be removed and an oxidation catalyst provided in an exhaust path for discharging the exhaust gas from the gas consuming device and oxidizing harmful components contained in the exhaust gas passing through the exhaust path. A device, a bypass path branched from the exhaust path, and a switching unit provided in the exhaust path to switch the exhaust gas discharge destination from the oxidation treatment device to the bypass path when the desulfurizer is regenerated. It is characterized by that.

Further, the exhaust gas purification device of the present invention is an exhaust gas purification device applied to a gas consumption device that consumes fuel gas and discharges exhaust gas, and contains a desulfurizing agent that removes toxic components contained in the fuel gas. An oxidation treatment device provided in the exhaust path for exhausting the exhaust gas from the gas consuming device and accommodating an oxidation catalyst for oxidizing harmful components contained in the exhaust gas that has passed through the exhaust path, and the exhaust path. It is characterized by including a bypass path branched from the above, and a switching unit provided in the exhaust path and switching the exhaust gas discharge destination from the oxidation treatment device to the bypass path when the exhaust gas is regenerated.

In order to solve the above problems, the exhaust gas purification device of the present invention is an exhaust gas purification device applied to a gas consumption device that consumes fuel gas and discharges exhaust gas, and discharges the exhaust gas from the gas consumption device. A desulfurizing device provided in the exhaust path and containing a desulfurizing agent for removing the toxic component contained in the exhaust gas, and the exhaust gas in close proximity to or in contact with the desulfurizing device on the downstream side of the desulfurizing device in the exhaust gas discharge direction. It is supplied to at least one of the oxidation treatment device provided in the path and containing an oxidation catalyst that oxidizes the harmful components contained in the exhaust gas, and the plurality of cylinders provided in the gas consuming device when the desulfurization device is regenerated. It is characterized by comprising a control unit for controlling the gas consuming device so that the exhausted fuel gas is discharged to the exhaust path.

According to the present invention, an exhaust gas purification system and an exhaust gas purification device for efficiently removing poisonous components and purifying exhaust gas are provided.

It is a schematic diagram which shows the exhaust gas purification system which concerns on 1st Embodiment of this invention. It is a flowchart which shows the operation of the exhaust gas purification system which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the exhaust gas purification apparatus which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the gas consumption apparatus applied to the exhaust gas purification apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the operation of the exhaust gas purification system which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the exhaust gas purification apparatus of the normal mode which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the exhaust gas purification apparatus of the regeneration mode which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the exhaust gas purification apparatus of the normal mode which concerns on 4th Embodiment of this invention. It is a schematic diagram which shows the exhaust gas purification apparatus of the regeneration mode which concerns on 4th Embodiment of this invention.

The exhaust gas purification system 1 according to the first embodiment of the present invention will be described. As shown in FIG. 1, the exhaust gas purification system 1 is applied to a gas consuming device 2 such as an engine that consumes fuel gas such as natural gas, and purifies the exhaust gas discharged from the gas consuming device 2. Since the fuel gas contains harmful components such as hydrocarbons that cause air pollution and poisonous components such as sulfur compounds that cause catalyst deterioration, the exhaust gas purification system 1 has these harmful components and poisonous components. Is configured to remove.

The gas consuming device 2 is connected to a supply path 3 for supplying fuel gas from a fuel tank or the like and an exhaust path 4 for discharging exhaust gas. The exhaust gas purification system 1 includes a desulfurizer 5 that removes toxic components such as sulfur compounds contained in the fuel gas, and an oxidation treatment device 6 that oxidizes harmful components such as hydrocarbons contained in the exhaust gas. Further, the exhaust gas purification system 1 is configured to include the exhaust gas path 4 described above, and includes a bypass path 7 branched from the exhaust gas path 4. The exhaust gas purification system 1 includes a switching unit 8 at a branch position between the exhaust path 4 and the bypass path 7, and further includes a heat exchanger 9 in the bypass path 7.

The gas consuming device 2 is composed of an engine that burns and operates using fuel gas such as liquefied natural gas (LNG). These engines include gas engines that use fuel gas as fuel, dual fuel engines that operate using fuel gas and liquid fuel such as gasoline and diesel fuel, and operation that uses fuel gas and operation that uses liquid fuel. There is a bi-fuel engine, etc. that operates by switching. These engines are applied to, for example, a drive source for ships such as coastal vessels and a drive source for land such as a generator and a heat pump. For example, the gas consuming device 2 includes a plurality of cylinders 10, an intake unit 11, a fuel gas supply unit 12, and an exhaust unit 13, and a piston (not shown) is housed in each cylinder 10.

The intake unit 11 includes an intake manifold 15 connected to the combustion chamber of each cylinder 10. The intake manifold 15 includes each distribution path 16 connected to the combustion chamber of each cylinder 10, and distributes the air supplied from the intake pipe (not shown) and supplies the air to the combustion chamber of each cylinder 10.

The fuel gas supply unit 12 is connected to the supply path 3, and distributes and supplies the fuel gas supplied from the fuel tank (not shown) or the like via the supply path 3 to the combustion chambers of each cylinder 10. For example, the fuel gas supply unit 12 distributes the fuel gas to each distribution path 16 of the intake manifold 15 of the intake unit 11.

As a result, the mixed gas of the air supplied from the intake pipe and the fuel gas supplied from the fuel gas supply unit 12 is supplied to the combustion chamber of each cylinder 10 via each distribution path 16 of the intake manifold 15. .. A throttle valve (not shown) is provided in each distribution path 16, and the ratio and amount of the mixed gas supplied to the combustion chamber of each cylinder 10 are adjusted by the throttle valve.

The exhaust unit 13 includes an exhaust manifold 17 connected to the combustion chamber of each cylinder 10. The exhaust manifold 17 is also connected to the exhaust path 4, and collects the exhaust gas discharged from the combustion chamber of each cylinder 10 and discharges the exhaust gas through the exhaust path 4.

In the desulfurizer 5, the gas in the fuel gas supply direction between the fuel tank and the fuel gas supply unit 12 of the gas consuming device 2 is provided so that the fuel gas flowing through the supply path 3 passes through the desulfurizer 5. It is provided in the supply path 3 on the upstream side of the consumption device 2. The desulfurizer 5 contains a desulfurizing agent that removes toxic components such as sulfur compounds from the fuel gas. For example, the desulfurizer 5 has an adsorbent such as activated carbon or zeolite that physically adsorbs the toxic component as a desulfurizing agent, or has a direct decomposition type hydrogen sulfide production catalyst and zirconium oxide and zinc oxide that remove the toxic component. It has a chemically adsorbed desulfurizing agent consisting of a catalyst containing it.

The desulfurizer 5 adsorbs and removes the toxic component from the fuel gas flowing through the supply path 3 to the desulfurizing agent, and the toxic substance composed of the toxic component is accumulated in the desulfurizing agent. As a result, the fuel gas from which the poisonous component has been removed, that is, the desulfurized fuel gas is supplied to the gas consuming device 2.

When the desulfurizing agent is heated to a predetermined regeneration temperature or higher, the toxic substance such as the sulfur compound adsorbed on the desulfurizing agent is desorbed and the desulfurizer 5 is regenerated. A desulfurizing agent made of activated carbon, zeolite or the like is a catalyst that can be regenerated at a relatively low temperature, for example, about 200 ° C. Further, the exhaust gas purification system 1 may be provided with a temperature sensor 18 for detecting the temperature of the desulfurizer 5 in the vicinity of the desulfurizer 5.

The oxidation treatment device 6 is provided in the exhaust path 4 so that the exhaust gas flowing through the exhaust path 4 passes through the oxidation treatment device 6. The oxidation treatment device 6 contains an oxidation catalyst that removes harmful components such as hydrocarbons (for example, methane) and carbon monoxide from the exhaust gas. The oxidation treatment device 6 oxidizes and removes harmful components into carbon dioxide and water by an oxidation catalyst.

The bypass path 7 branches from the exhaust path 4 between the exhaust unit 13 of the gas consuming device 2 and the oxidation treatment device 6, in other words, on the upstream side of the oxidation treatment device 6 in the exhaust gas discharge direction. As a result, the exhaust gas discharged from the gas consuming device 2 via the exhaust path 4 is divided into a discharge via the oxidation treatment device 6 and a discharge via the bypass path 7.

The switching unit 8 is provided at a branch position to the bypass path 7 in the exhaust path 4 as described above. The switching unit 8 is configured to switch the exhaust gas discharged from the gas consuming device 2 via the exhaust path 4 to a discharge via the oxidation treatment device 6 and a discharge via the bypass path 7. In other words, the switching unit 8 is a damper, a valve, or the like that switches the flow path downstream from the branch position in the exhaust gas discharge direction to the flow path on the oxidation processor 6 side and the flow path on the bypass path 7 side. It is composed. The switching unit 8 completely closes either the flow path on the oxidation processor 6 side or the flow path on the bypass path 7 side. For example, the switching unit 8 is controlled to switch to the flow path on the bypass path 7 side when the desulfurizer 5 is regenerated.

The heat exchanger 9 is provided in the bypass path 7 as described above, and is arranged in close proximity to or in contact with the desulfurization device 5. When the exhaust gas flows through the bypass path 7, the heat exchanger 9 heats the desulfurizer 5 by performing heat treatment by heat exchange using the high-temperature exhaust gas. The heat exchanger 9 may heat the heat transfer material and heat the desulfurization device 5 with the heat transfer material.

Further, the exhaust gas purification system 1 includes a control unit 20. The control unit 20 includes a computer such as a CPU and a storage device including a ROM, a RAM, and the like. The storage device stores programs and data for controlling various components and functions of the exhaust gas purification system 1, and a computer executes arithmetic processing based on the programs and data stored in the storage device. Controls various components and functions. The control unit 20 may be configured by using an engine ECU that controls an engine that is a gas consuming device 2.

The exhaust gas purification system 1 operates by switching between a normal mode and a regeneration mode as an operation mode. The control unit 20 functions as a mode control unit 21 that controls an operation mode by executing a program stored in the storage device.

The mode control unit 21 switches the operation mode to the normal mode when the gas consuming device 2 is operated normally, and switches the operation mode to the reproduction mode when the desulfurizer 5 is regenerated. Further, the mode control unit 21 stops the heat exchanger 9 in the normal mode, while operating the heat exchanger 9 in the regeneration mode.

For example, the mode control unit 21 normally sets the operation mode to the normal mode, and when the integrated amount of the poisonous substance accumulated in the desulfurizer 5 exceeds a predetermined integrated amount threshold value, the operation mode is normally set to the normal mode. Switch from mode to playback mode. The integrated amount threshold value is appropriately set according to the type of desulfurized material of the desulfurizer 5.

The mode control unit 21 detects the amount of fuel gas supplied to the gas consuming device 2 or the amount of exhaust gas discharged from the gas consuming device 2, and is a toxic substance based on the amount of fuel gas supplied or the amount of exhaust gas discharged. Estimate and calculate the integrated amount. For example, the mode control unit 21 may detect the fuel gas supply amount by the fuel gas flow rate sensor 22 provided in the supply path 3. Further, the mode control unit 21 may detect the exhaust gas supply amount by the exhaust gas flow rate sensor 23 provided in the exhaust path 4. The mode control unit 21 resets the integrated amount of poisonous substances when the operation mode is switched from the reproduction mode to the normal mode.

Alternatively, the mode control unit 21 may switch the operation mode to the regeneration mode when another abnormality of the desulfurizer 5 is detected or when the desulfurizer 5 is instructed to be regenerated by a manual operation.

The mode control unit 21 switches the operation mode from the regeneration mode to the normal mode after the regeneration of the desulfurizer 5 is completed in the regeneration mode, for example, after a predetermined regeneration time has elapsed after the regeneration of the desulfurizer 5 is started.

Next, an operation example of the exhaust gas purification system 1 in the normal mode will be described with reference to FIG. When the exhaust gas purification system 1 is newly installed, the mode control unit 21 sets the operation mode to the normal mode (step S1), and sets the flow path downstream from the branch position of the exhaust path 4 to the oxidation processor 6 side. The switching unit 8 is controlled so as to switch to the flow path of. At this time, the switching unit 8 opens the flow path on the oxidation treatment device 6 side and closes the flow path on the bypass path 7 side.

When the gas consuming device 2 is operated in the normal mode (step S2), the fuel gas is supplied from the fuel tank to the gas consuming device 2 via the supply path 3 and the desulfurization device 5. At this time, the poisonous component of the fuel gas is adsorbed by the desulfurization device 5, and the desulfurized fuel gas is supplied to the gas consuming device 2. The fuel gas is burned in the combustion chamber of each cylinder 10 of the gas consuming device 2 during operation, and as a result, the exhaust gas is discharged from the gas consuming device 2 to the exhaust path 4.

Since the flow path of the exhaust path 4 is connected to the oxidation treatment device 6, the exhaust gas is discharged to the oxidation treatment device 6. At this time, the harmful components of the exhaust gas are removed by the oxidation treatment device 6, and the purified exhaust gas is discharged from the oxidation treatment device 6. When the gas consuming device 2 is stopped (step S3: Yes), the operation of the exhaust gas purification system 1 is also terminated.

Next, an operation example of the regeneration mode of the exhaust gas purification system 1 will be described with reference to FIG. While the gas consuming device 2 is being operated in the normal mode, the mode control unit 21 monitors the integrated amount of the toxic substance of the desulfurizer 5, and the integrated amount of the toxic substance exceeds a predetermined integrated amount threshold value. (Step S4: Yes), the operation mode is switched from the normal mode to the reproduction mode (step S5).

In the reproduction mode, the mode control unit 21 controls the switching unit 8 so as to switch the flow path on the downstream side of the branch position of the exhaust path 4 to the flow path on the bypass path 7 side (step S6). At this time, the switching unit 8 opens the flow path on the bypass path 7 side and closes the flow path on the oxidation processor 6 side. Further, the mode control unit 21 controls and operates the heat exchanger 9.

When the gas consuming device 2 is operated in the regeneration mode, the fuel gas flows through the supply path 3 and the desulfurizing device 5 and the fuel gas desulfurized by the desulfurizing device 5 is supplied to the gas consuming device 2 as in the normal mode. Desulfurization. The fuel gas is burned in each cylinder 10 of the gas consuming device 2, and the exhaust gas is discharged from the gas consuming device 2 to the exhaust path 4.

Since the flow path of the exhaust path 4 is connected to the bypass path 7 side, the exhaust gas is discharged to the bypass path 7. At this time, the exhaust gas passes through the heat exchanger 9 in the middle of the bypass path 7, and the exhaust gas becomes high temperature due to the combustion of the fuel gas. 5 is heated (step S7).

The mode control unit 21 detects the temperature of the desulfurizer 5 by the temperature sensor 18, and based on the detection result, heats the desulfurizer 5 so that the temperature does not exceed a predetermined temperature threshold (for example, about 200 degrees). It is preferable to control the heating by the exchanger 9 and the operation of the gas consuming device 2. The mode control unit 21 may appropriately adjust the heating temperature (that is, the temperature threshold value) of the desulfurizer 5 by the heat exchanger 9 according to the type of the desulfurized material of the desulfurizer 5.

In the desulfurizer 5, when the desulfurizing agent in which the toxic substance is accumulated is heated by the heat exchanger 9, the toxic substance is desorbed from the desulfurizing agent, whereby the desulfurizing agent in the desulfurizing apparatus 5 is regenerated. The desorbed poisonous substance is sent to the gas consuming device 2 together with the fuel gas through the supply path 3, and is sent to the exhaust path 4 together with the exhaust gas, but is not sent to the oxidation treatment device 6 but is sent through the bypass path 7. Is discharged.

When a predetermined playback time has elapsed since the mode control unit 21 started the playback mode (step S8: Yes), the mode control unit 21 switches the operation mode from the playback mode to the normal mode (step S1).

In the first embodiment described above, the exhaust gas purification system 1 has described an example in which the desulfurization device 5 is arranged in the supply path 3 for supplying the fuel gas to the gas consuming device 2, but the present invention is not limited to this example. ..

For example, in another example of the first embodiment, the exhaust gas purification system 1 may arrange the desulfurizer 5 in the exhaust path 4 for discharging the exhaust gas from the gas consuming device 2. In this case, the desulfurizer 5 is arranged between the exhaust portion 13 of the gas consuming device 2 and the branch position to the bypass path 7 in the exhaust path 4, in other words, the branch to the bypass path 7 in the exhaust gas discharge direction. It is located upstream of the position. Even in this case, the mode control unit 21 controls the switching unit 8 so as to switch the flow path of the exhaust path 4 to the flow path on the bypass path 7 side in the reproduction mode. Therefore, the toxic substance desorbed from the desulfurization device 5 during regeneration of the desulfurization device 5 is discharged via the bypass path 7 without being sent to the oxidation treatment device 6.

As described above, according to the first embodiment of the present invention, the exhaust gas purification system 1 applied to the gas consuming device 2 that consumes the fuel gas and discharges the exhaust gas removes the toxic component contained in the fuel gas. An oxidation treatment device that is provided in the desulfurizing device 5 that houses the desulfurizing agent and the exhaust gas that discharges the exhaust gas from the gas consuming device 2 and that houses the oxidation catalyst that oxidizes the harmful components contained in the exhaust gas that has passed through the exhaust gas path 4. 6 and. Further, the exhaust gas purification system 1 is provided in the bypass path 7 branched from the exhaust path 4 and the exhaust path 4, and switches the exhaust gas discharge destination from the oxidation treatment device 6 to the bypass path 7 when the desulfurizer 5 is regenerated. A unit 8 is provided.

As a result, according to the exhaust gas purification system 1 of the first embodiment of the present invention, the toxic substance desorbed from the desulfurization device 5 during regeneration of the desulfurization device 5 is not sent to the oxidation treatment device 6, and is bypassed through the bypass path 7. Is discharged through. Therefore, it is possible to suppress the poisoning of the oxidation treatment device 6 by the poisonous substance desorbed from the desulfurization device 5 at the time of regeneration, and it is possible to reduce the deterioration of the oxidation treatment device 6. As described above, since the exhaust gas purification system 1 suppresses the poisoning of the oxidation treatment device 6 by a simple configuration to which the bypass path 7 is applied, the desulfurization device 5 can be applied without complicated configuration. As a result, the exhaust gas purification system 1 can efficiently remove the poisonous component and purify the exhaust gas. The exhaust gas purification system 1 can more reliably block the distribution of the poisonous substance to the oxidation treatment device 6 at the time of regeneration of the desulfurization device 5 by the damper, valve or the like of the switching unit 8.

In the exhaust gas purification system 1 of the first embodiment of the present invention, the desulfurizer 5 is provided in the supply path 3 that stores the desulfurizing agent that adsorbs the poisonous component by physical adsorption and supplies the fuel gas to the gas consuming device 2. .. As a result, the desulfurizer 5 desulfurizes the poisonous component from the fuel gas before combustion, which is lower in temperature than the exhaust gas after combustion, so that a desulfurizing agent that adsorbs the poisonous component at a relatively low temperature can be applied. .. Therefore, the desulfurizer 5 can improve the collection rate of the poisoned component by the configuration of desulfurizing the poisoned component from the low temperature fuel gas, as compared with the case of desulfurizing the poisoned component from the high temperature exhaust gas.

Further, in such an exhaust gas purification system 1, a desulfurizer 5 at a lower cost can be applied as compared with the case where the poisonous component is desulfurized from the high temperature exhaust gas. Further, the exhaust gas purification system 1 can reduce the heating of the desulfurizer 5 when heating the desulfurizer 5 to regenerate it, as compared with the case of desulfurizing the poisonous component from the high temperature exhaust gas. Therefore, the cost of the heating means of the desulfurization device 5 can be reduced, and the complexity of the configuration and installation of the heating means can be suppressed.

The exhaust gas purification system 1 of the first embodiment of the present invention is connected to the bypass path 7, and heat exchange heats the desulfurizer 5 by heat exchange using the exhaust gas flowing through the bypass path 7 when the desulfurizer 5 is regenerated. Further equipped with a vessel 9. As a result, the exhaust gas purification system 1 applies the heat exchanger 9 as the heating means of the desulfurization device 5, thereby reducing the cost of the heating means of the desulfurization device 5 and suppressing the complexity of the configuration and installation of the heating means. Can be realized.

In the exhaust gas purification system 1 of the first embodiment of the present invention, the mode control unit 21 is a desulfurizer based on the amount of fuel gas supplied to the gas consuming device 2 or the amount of exhaust gas discharged from the gas consuming device 2. The integrated amount of the poisonous component accumulated in 5 is calculated, and when the integrated amount exceeds a predetermined threshold value, the regeneration of the desulfurizer 5 is started. As a result, the exhaust gas purification system 1 appropriately grasps the accumulated amount of the poisonous component accumulated in the desulfurization device 5, and when the decrease in the desulfurization capacity of the desulfurization device 5 is detected, the desulfurization device 5 is regenerated. be able to. Since the integrated amount threshold value of the accumulated amount of the poisonous substance is appropriately set according to the type of the desulfurizing material of the desulfurizing device 5, the desulfurizing device 5 can be regenerated at an appropriate timing for each desulfurizing device 5.

In the first embodiment described above, the present invention is applied to an exhaust gas purification system 1 including a desulfurizer 5, an oxidation treatment device 6, a bypass path 7, a switching unit 8, a heat exchanger 9, and a control unit 20. As described above, the present invention is not limited to this example.

For example, in another example of the first embodiment, the present invention comprises an exhaust gas purification device 100 including a desulfurizer 5, an oxidation treatment device 6, a bypass path 7, a switching unit 8, a heat exchanger 9, and a control unit 20. May be done (see Figure 1). In this case, in the exhaust gas purification device 100, the desulfurization device 5 is connected to the supply path 3 extending from the gas consumption device 2, and the oxidation treatment device 6 and the bypass are connected to the exhaust path 4 extending from the gas consumption device 2. The path 7 and the switching unit 8 are connected. Alternatively, the exhaust gas purification device 100 may be configured to include a supply path 3 and an exhaust path 4 connected to the gas consumption device 2.

The exhaust gas purification device 101 according to the second embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 3 and 6 to 9, the exhaust gas purifying device 101 is applied to a gas consuming device 102 such as an engine that consumes fuel gas such as natural gas, and the exhaust gas discharged from the gas consuming device 102. Purify. The gas consuming device 102 is connected to a supply path 103 for supplying fuel gas from a fuel tank or the like and an exhaust path 104 for discharging exhaust gas. Since the fuel gas contains harmful components such as hydrocarbons that cause air pollution and poisonous components such as sulfur compounds that cause catalyst deterioration, the exhaust gas purification device 101 is derived from the exhaust gas generated by the combustion of the fuel gas. It is configured to remove harmful and toxic components.

The exhaust gas purification device 101 of the second embodiment of the present invention will be described with reference to FIG. The exhaust gas purification device 101 includes a desulfurization device 105 that removes toxic components such as sulfur compounds contained in the fuel gas, and an oxidation treatment device 106 that oxidizes harmful components such as hydrocarbons contained in the exhaust gas. The exhaust gas purification device 101 is configured to include the exhaust path 104 described above.

The gas consuming device 102 is composed of an engine that burns and operates using fuel gas such as liquefied natural gas (LNG). These engines include gas engines that use fuel gas as fuel, dual fuel engines that operate using fuel gas and liquid fuel such as gasoline and diesel fuel, and operation that uses fuel gas and operation that uses liquid fuel. There is a bi-fuel engine, etc. that operates by switching. These engines are applied to, for example, a drive source for ships such as coastal vessels and a drive source for land such as a generator and a heat pump. For example, the gas consuming device 102 is a multi-cylinder engine in which a plurality of cylinders 110 are arranged, and includes an intake unit 111, a fuel gas supply unit 112, and an exhaust unit 113.

As shown in FIG. 4, each cylinder 110 is composed of a cylinder 115 having a combustion chamber, a piston 116 housed in the cylinder 115, and an ignition device 117. The ignition device 117 is composed of, for example, a spark plug, an injector for pilot ignition, and the like. The cylinder 110 introduces a mixed gas containing fuel gas into the combustion chamber of the cylinder 115, ignites the mixed gas in the combustion chamber by operating the ignition device 117, and burns the mixed gas, and discharges the exhaust gas generated by the combustion. Further, when the ignition device 117 is stopped, the cylinder 110 misfires without being burned.

The intake unit 111 includes an intake manifold 118 connected to each cylinder 110. The intake manifold 118 includes each distribution path 119 connected to the cylinder 115 of each cylinder 110, and distributes the air supplied from the intake pipe (not shown) to the combustion chamber of each cylinder 115. The intake unit 111 includes an intake valve 120 between each distribution path 119 and each cylinder 115.

The fuel gas supply unit 112 is provided in the supply path 103, and distributes and supplies the fuel gas supplied from the fuel tank (not shown) or the like via the supply path 103 to the cylinder 115 of each cylinder 110.

For example, when the gas consuming device 102 is composed of a port injection engine, the fuel gas supply unit 112 supplies the fuel gas to each distribution path 119 of the intake manifold 118 of the intake unit 111, so that the fuel gas is distributed. It is supplied to the combustion chamber of each cylinder 115 via the path 119. As a result, the mixed gas of the air supplied from the intake pipe and the fuel gas supplied from the fuel gas supply unit 112 is supplied to the combustion chamber of each cylinder 115 via each distribution path 119 of the intake manifold 118. .. By opening and closing the intake valve 120, the supply or shutoff of the mixed gas is controlled for the combustion chamber of each cylinder 115, and the supply amount of the mixed gas is adjusted. A throttle valve (not shown) is provided in each distribution path 119, and the throttle valve adjusts the ratio and amount of the mixed gas supplied to the combustion chamber of each cylinder 115.

Alternatively, the gas consuming device 102 may be configured as an in-cylinder direct injection engine. In this case, the fuel gas supply unit 112 is provided not in the supply path 103 but in each cylinder 115, and directly injects and supplies the fuel gas to the combustion chamber of each cylinder 115. As a result, in the combustion chamber of each cylinder 115, the air supplied from the intake unit 111 and the fuel gas supplied from the fuel gas supply unit 112 are mixed to generate a mixed gas. By opening and closing the intake valve 120, the supply or shutoff of air is controlled for the combustion chamber of each cylinder 115, and the amount of air supplied is adjusted. The fuel gas supply unit 112 may include a fuel valve (not shown), and by opening and closing the fuel valve, supply or shutoff of fuel gas to the combustion chamber of each cylinder 115 is controlled, and fuel is also supplied. The gas supply is adjusted.

The exhaust unit 113 includes an exhaust manifold 121 connected to the cylinder 115 of each cylinder 110. The exhaust manifold 121 is also connected to the exhaust path 104, and collects the exhaust gas discharged from the combustion chamber of each cylinder 115 and discharges the exhaust gas through the exhaust path 104. The exhaust unit 113 includes an exhaust valve 122 between each cylinder 115 and the exhaust manifold 121. By opening and closing the exhaust valve 122, exhaust gas emission or shutoff from the combustion chamber of each cylinder 115 is controlled.

The gas consuming device 102 sets at least one of the plurality of cylinders 110 as the fuel supply cylinder 110a at the time of regeneration of the desulfurization device 105, and is configured to be able to discharge the fuel gas to the exhaust path 104 through the fuel supply cylinder 110a. Will be done. At this time, the normal cylinder 110b, which is a cylinder 110 other than the fuel supply cylinder 110a, may perform normal operation to burn the fuel gas and discharge the exhaust gas.

For example, the gas consuming device 102 stops the ignition device 117 of the fuel supply cylinder 110a and misfires the fuel supply cylinder 110a. The gas consuming device 102 opens the intake valve 120 of the fuel supply cylinder 110a to introduce the mixed gas into the combustion chamber of the cylinder 115 of the fuel supply cylinder 110a, but since the ignition device 117 is stopped, the mixed gas is used. Not ignited and not burned. A mixed gas containing a higher concentration fuel gas may be introduced into the fuel supply cylinder 110a as compared with the case where the fuel supply cylinder 110a is not misfired.

The gas consuming device 102 opens the exhaust valve 122 of the fuel supply cylinder 110a and discharges the mixed gas introduced into the fuel supply cylinder 110a to the exhaust path 104 without burning. As a result, in the gas consuming device 102, the fuel gas contained in the mixed gas is discharged to the exhaust path 104. Since the normal cylinder 110b burns the fuel gas and discharges the exhaust gas to the exhaust path 104, the mixed gas from the fuel supply cylinder 110a and the exhaust gas from the normal cylinder 110b are aggregated in the exhaust path 104. Exhaust gas including fuel gas is emitted. Therefore, the exhaust gas containing the fuel gas having a higher concentration is discharged to the exhaust path 104 as compared with the case where the fuel supply cylinder 110a is not misfired.

The desulfurization device 105 is provided in the exhaust path 104 on the downstream side of the gas consuming device 102 in the exhaust gas discharge direction so that the exhaust gas discharged from the exhaust unit 113 passes through the desulfurization device 105. The desulfurizer 105 contains a desulfurizing agent that removes toxic components such as sulfur compounds. For example, the desulfurizer 105 has a chemically adsorbed desulfurizing agent consisting of a directly decomposing hydrogen sulfide production catalyst and a catalyst containing zinc oxide and zinc oxide for removing toxic components.

When a combustion gas containing a toxic component such as a sulfur compound is burned by the gas consuming device 102, the toxic component remains in the exhaust gas generated by the combustion. Therefore, the desulfurizer 105 adsorbs and removes the toxic component from the exhaust gas discharged from the exhaust path 104 to the desulfurizing agent, and the toxic substance composed of the toxic component is accumulated in the desulfurizing agent. As a result, the exhaust gas from which the poisonous component has been removed, that is, the desulfurized exhaust gas, is discharged to the oxidation treatment device 106. Further, when the desulfurizing agent is heated to a predetermined regeneration temperature or higher, the toxic substance such as the sulfur compound adsorbed on the desulfurizing agent is desorbed and the desulfurizer 105 is regenerated.

The oxidation treatment device 106 is provided in the exhaust path 104 on the downstream side of the desulfurization device 105 in the exhaust gas discharge direction so that the exhaust gas that has passed through the desulfurization device 105 passes through the oxidation treatment device 106. The oxidation treatment device 106 is arranged in close proximity to or in contact with the desulfurization device 105. The oxidation treatment device 106 houses an oxidation catalyst (for example, a methane oxidation catalyst) that removes harmful components such as hydrocarbons (for example, methane) and carbon monoxide from the exhaust gas. The oxidation treatment device 106 removes harmful components contained in the exhaust gas discharged through the exhaust path 104 by oxidizing them to carbon dioxide or water by an oxidation catalyst.

The oxidation catalyst of the oxidation treatment device 106 generates heat of oxidation reaction by oxidizing hydrocarbons such as methane. During normal operation of the gas consuming device 102, only the exhaust gas after burning the fuel gas is introduced into the oxidation treatment device 106, but when the desulfurization device 105 is regenerated, the exhaust gas containing the unburned fuel gas is introduced into the oxidation treatment device 106. Will be introduced to. Therefore, as compared with the normal operation of the gas consuming device 102, the exhaust gas containing a high concentration fuel gas, that is, the exhaust gas containing a high concentration hydrocarbon is introduced into the oxidation treatment device 106 during the regeneration of the desulfurization device 105, and more of the exhaust gas is introduced. Oxidation reaction heat is generated. The oxidation treatment device 106 heats and regenerates the desulfurization device 105 by transferring the generated oxidation reaction heat to the desulfurization device 105 in close proximity or in contact with the desulfurization device 105. The oxidation treatment device 106 may include a transfer member that transfers the heat of the oxidation reaction to the desulfurization device 105.

Further, the exhaust gas purification device 101 includes a control unit 130 as a control unit. The control unit 130 includes a computer such as a CPU and a storage device including a ROM, a RAM, and the like. The storage device stores programs and data for controlling various components and functions of the exhaust gas purification device 101, and a computer executes arithmetic processing based on the programs and data stored in the storage device. Controls various components and functions. The control unit 130 may be configured by using an engine ECU that controls an engine that is a gas consuming device 102.

The exhaust gas purification device 101 operates by switching between a normal mode and a reproduction mode as an operation mode. The control unit 130 functions as a mode control unit 131 that controls an operation mode by executing a program stored in the storage device.

The mode control unit 131 switches the operation mode to the normal mode when the gas consuming device 102 is operated normally, and switches the operation mode to the reproduction mode when the desulfurizer 105 is regenerated. Further, the mode control unit 131 normally operates a plurality of cylinders 110 of the gas consuming device 102 in the normal mode. On the other hand, in the regeneration mode, the mode control unit 131 selects the fuel supply cylinder 110a for discharging the fuel gas from the plurality of cylinders 110, misfires the fuel supply cylinder 110a, and normally operates the normal cylinder 110b. The mode control unit 131 may not select only the predetermined cylinder 110 as the fuel supply cylinder 110a, but may switch the cylinder 110 selected as the fuel supply cylinder 110a every predetermined number of times of switching the regeneration mode.

For example, the mode control unit 131 normally sets the operation mode to the normal mode, and when the integrated amount of the poisonous substance accumulated in the desulfurizer 105 exceeds a predetermined integrated amount threshold value, the operation mode is normally set to the normal mode. Switch from mode to playback mode. The integrated amount threshold value is appropriately set according to the type of desulfurized material of the desulfurizer 105.

The mode control unit 131 detects the amount of fuel gas supplied to the gas consuming device 102 or the amount of exhaust gas discharged from the gas consuming device 102, and is a toxic substance based on the amount of fuel gas supplied or the amount of exhaust gas discharged. Estimate and calculate the integrated amount. For example, the mode control unit 131 may detect the fuel gas supply amount by the fuel gas flow rate sensor 132 provided in the supply path 103. The control unit 130 is connected to the flow rate sensor 132, and inputs the detected amount of fuel gas from the flow rate sensor 132. Further, the mode control unit 131 may detect the exhaust gas supply amount by the exhaust gas flow rate sensor 133 provided in the exhaust path 104. The control unit 130 is connected to the flow rate sensor 133, and inputs the detected amount of exhaust gas from the flow rate sensor 133.

Alternatively, the mode control unit 131 may switch the operation mode to the regeneration mode when another abnormality of the desulfurizer 105 is detected or when the desulfurizer 105 is instructed to be regenerated by a manual operation.

The mode control unit 131 switches the operation mode from the regeneration mode to the normal mode after the regeneration of the desulfurizer 105 is completed in the regeneration mode, for example, after a predetermined regeneration time has elapsed after the regeneration of the desulfurizer 105 is started. The mode control unit 131 resets the integrated amount of poisonous substances when the operation mode is switched from the reproduction mode to the normal mode.

When the desulfurizer 105 is regenerated in the regeneration mode, the mode control unit 131 controls the amount of fuel gas discharged from the gas consuming device 102 in order to desorb the toxic substance adsorbed on the desulfurizing agent, and oxidizes. The heating of the desulfurizer 105 by the heat of the oxidation reaction of the processor 106 is controlled. For example, the mode control unit 131 adjusts the number of fuel supply cylinders 110a, the amount of fuel gas supplied to the fuel supply cylinder 110a, or the ratio of the mixed gas to adjust the amount of fuel gas discharged from the gas consuming device 102. Control. The exhaust gas purification device 101 includes a temperature sensor 134 that detects the temperature of the desulfurizer 105 in the vicinity of the desulfurizer 105. The control unit 130 is connected to the temperature sensor 134, and inputs the detection temperature of the desulfurizer 105 from the temperature sensor 134. Then, the mode control unit 131 controls the amount of fuel gas discharged from the gas consuming device 102 so that the detection temperature of the desulfurization device 105 becomes a predetermined regeneration temperature.

Next, an operation example of the exhaust gas purification device 101 in the normal mode will be described with reference to FIG. When the exhaust gas purification device 101 or the desulfurization device 105 is newly installed, the mode control unit 131 sets the operation mode to the normal mode (step S11).

When operating the gas consuming device 102 in the normal mode (step S12), fuel gas is supplied from the fuel tank to the gas consuming device 102 via the supply path 103. The fuel gas is burned in the combustion chamber of the cylinder 115 of each cylinder 110 of the gas consuming device 102 during operation, and as a result, the exhaust gas is discharged from the gas consuming device 102 to the exhaust path 104. The exhaust gas flows through the exhaust path 104 and is introduced into the desulfurization device 105, the poisonous component of the exhaust gas is adsorbed by the desulfurization device 105, and the exhaust gas after desulfurization is discharged from the desulfurization device 105.

The exhaust gas discharged from the desulfurization device 105 flows through the exhaust path 104 and is introduced into the oxidation treatment device 106, the harmful components of the exhaust gas are removed by the oxidation treatment device 106, and the purified exhaust gas is discharged from the oxidation treatment device 106. .. When the gas consuming device 102 is stopped (step S13: Yes), the operation of the exhaust gas purifying device 101 also ends.

Next, an operation example of the regeneration mode of the exhaust gas purification device 101 will be described with reference to FIG. While the gas consuming device 102 is operated in the normal mode, the mode control unit 131 monitors the integrated amount of poisonous substances in the desulfurizer 105, and the integrated amount of poisoned substances exceeds a predetermined integrated amount threshold value. (Step S14: Yes), the operation mode is switched from the normal mode to the reproduction mode (step S15).

In the reproduction mode, the mode control unit 131 selects the fuel supply cylinder 110a for discharging the fuel gas from the plurality of cylinders 110 and causes a misfire (step S16). As a result, the exhaust gas containing the high-concentration fuel gas is discharged from the gas consuming device 102 to the exhaust path 104. The exhaust gas flows through the exhaust path 104 and is introduced into the desulfurization device 105, the poisonous component of the exhaust gas is adsorbed by the desulfurization device 105, and the exhaust gas after desulfurization is discharged from the desulfurization device 105. At this time, the exhaust gas after desulfurization still contains a high concentration fuel gas.

The exhaust gas discharged from the desulfurization device 105 flows through the exhaust path 104 and is introduced into the oxidation treatment device 106, the harmful components of the exhaust gas are removed by the oxidation treatment device 106, and the purified exhaust gas is discharged from the oxidation treatment device 106. .. At this time, the high-concentration hydrocarbon contained in the fuel gas in the exhaust gas is oxidized by the oxidation catalyst of the oxidation treatment device 106, high-temperature oxidation reaction heat is generated and transferred to the desulfurization device 105, and the desulfurizing agent of the desulfurization device 105 is generated. Is heated (step S17).

While the desulfurizer 105 is being heated, the mode control unit 131 detects the temperature of the desulfurizer 105 by the temperature sensor 134, and the gas consuming device 102 so that the detected temperature of the desulfurizer 105 becomes a predetermined regeneration temperature. It is preferable to control the emission of fuel gas by the fuel supply cylinder 110a. The mode control unit 131 may appropriately adjust the heating temperature (that is, the regeneration temperature) of the desulfurization device 105 due to the heat of oxidation reaction of the oxidation treatment device 106 according to the type of the desulfurization material of the desulfurization device 105.

In the desulfurizer 105, when the desulfurizing agent in which the toxic substance is accumulated is heated by the oxidation reaction heat of the oxidation treatment device 106, the toxic substance is desorbed from the desulfurizing agent, whereby the desulfurizing agent in the desulfurizing apparatus 105 is regenerated. (Step S17).

When a predetermined playback time has elapsed since the mode control unit 131 started the playback mode (step S18: Yes), the mode control unit 131 switches the operation mode from the playback mode to the normal mode (step S11).

By the way, if the fuel supply cylinder 110a is not normally operated, the total output of the gas consuming device 102 will decrease. Therefore, the mode control unit 131 may determine a reproduction timing that is not easily affected by the output decrease of the gas consuming device 102, and may control the operation mode to be switched to the reproduction mode only at the reproduction timing. For example, even when the integrated amount of the poisonous substance exceeds a predetermined integrated amount threshold value, the mode control unit 131 may control so as not to switch to the reproduction mode when it is necessary to maintain the output of the gas consuming device 102. Further, when the integrated amount of poisonous substance is estimated and it is necessary to maintain the output of the gas consuming device 102 when the integrated amount of poisoned substance exceeds a predetermined integrated amount threshold value based on the operation schedule of the gas consuming device 102. The mode control unit 131 may be controlled to switch to the reproduction mode in advance, or to switch to the reproduction mode when it is no longer affected by the output decrease of the gas consuming device 102.

In the second embodiment described above, the exhaust gas purification device 101 will be described by taking as an example that the integrated amount of the toxic substance of the desulfurizer 105 exceeds a predetermined integrated amount threshold value as a condition for switching the operation mode to the regeneration mode. However, the conditions for switching to the reproduction mode of the present invention are not limited to this example.

As another example of the switching condition to the reproduction mode, the exhaust gas purifying device 101 switches the operation mode from the normal mode to the reproduction mode when the temperature rise amount of the exhaust gas passing through the oxidation treatment device 106 falls below a predetermined temperature threshold value. You may. The temperature threshold value is appropriately set according to the type of the desulfurizing material of the desulfurizer 105 and the oxidation catalyst of the oxidation treatment device 106.

If the accumulation of the toxic substance exceeds the permissible amount, the desulfurizer 105 cannot accumulate the toxic substance and discharges the toxic substance, and the toxic substance discharged from the desulfurizer 105 is introduced into the oxidation treatment device 106. .. Since the toxic substance introduced into the oxidation treatment device 106 deteriorates the oxidation catalyst, the efficiency of oxidizing hydrocarbons in the exhaust gas is reduced, and the heat of oxidation reaction is reduced. Therefore, the amount of temperature rise of the exhaust gas that has passed through the oxidation treatment device 106 can be determined, and the integrated amount of the toxic substance of the desulfurizing device 105 can be estimated based on this temperature rise amount. In addition, it can be determined that the integrated amount of the toxic substance of the desulfurizer 105 exceeds the integrated amount threshold.

In this case, the exhaust gas purification device 101 includes an input temperature sensor 135 and an output temperature sensor 136 that detect the temperature of the exhaust gas flowing through the exhaust path 104. The input temperature sensor 135 is provided on the upstream side of the desulfurization device 105 in the exhaust gas discharge direction, and detects the temperature of the exhaust gas input to the desulfurization device 105 and the oxidation treatment device 106. The output temperature sensor 136 is provided on the downstream side of the oxidation treatment device 106 in the exhaust gas discharge direction, and detects the temperature of the exhaust gas output from the desulfurization device 105 and the oxidation treatment device 106.

The control unit 130 is connected to the input temperature sensor 135 and the output temperature sensor 136, and inputs the detected temperature of the exhaust gas from the input temperature sensor 135 and the output temperature sensor 136. The mode control unit 131 determines the amount of temperature rise of the exhaust gas that has passed through the oxidation treatment device 106 based on the difference between the detection temperature of the input temperature sensor 135 and the detection temperature of the output temperature sensor 136, that is, the temperature difference.

Alternatively, as another example of the switching condition to the regeneration mode, the exhaust gas purifying device 101 reproduces the operation mode from the normal mode when the predetermined component of the exhaust gas that has passed through the oxidation treatment device 106 does not satisfy the predetermined component amount threshold value. You may switch to the mode. The predetermined component of the exhaust gas is, for example, oxygen, a hydrocarbon, a sulfur compound, or the like, and the component amount such as the concentration or amount of the predetermined component is compared with the predetermined component amount threshold value. The component amount threshold value is appropriately set according to the type of the desulfurizing material of the desulfurizer 105 and the oxidation catalyst of the oxidation treatment device 106, and the type of the predetermined component.

The mode control unit 131 determines the oxidation efficiency of the hydrocarbon by the oxidation catalyst of the oxidation treatment device 106 based on the component amount of the predetermined component of the exhaust gas, and poisons the desulfurization device 105 based on the oxidation efficiency of the oxidation treatment device 106. The amount of accumulated material can be estimated. For example, the mode control unit 131 integrates the toxic substance integrated amount of the desulfurizer 105 when the oxygen concentration of the exhaust gas exceeds the component amount threshold value or when the amount of the hydrocarbon or sulfur compound in the exhaust gas exceeds the component amount threshold value. It can be determined that the quantity threshold is exceeded.

In this case, the exhaust gas purification device 101 includes an exhaust gas sensor 137 that detects a predetermined component such as oxygen, a hydrocarbon, or a sulfur compound contained in the exhaust gas flowing through the exhaust path 104. The exhaust gas sensor 137 is provided on the downstream side of the oxidation treatment device 106 in the exhaust gas discharge direction, and detects the amount of a predetermined component of the exhaust gas discharged from the oxidation treatment device 106. The control unit 130 is connected to the exhaust gas sensor 137, and inputs the amount of a predetermined component of the exhaust gas from the exhaust gas sensor 137 to cause the mode control unit 131 to determine the component amount.

Alternatively, the exhaust gas purification device 101 may switch to the regeneration mode when at least one of the above three conditions or two or more conditions are satisfied as the switching conditions to the regeneration mode.

Further, in the second embodiment described above, the exhaust gas purification device 101 has been described by taking as an example the misfire of the fuel supply cylinder 110a as a configuration for discharging the fuel gas to the fuel supply cylinder 110a, but the fuel of the present invention has been described. The fuel gas emission configuration of the supply cylinder 110a is not limited to this example.

As another example of the fuel gas discharge configuration of the fuel supply cylinder 110a, when the gas consumption device 102 is an in-cylinder direct injection engine, the exhaust gas purification device 101 is used to fuel the exhaust valve 122 immediately before opening, that is, immediately before exhausting. Fuel gas may be supplied to the exhaust manifold 121 by the gas supply unit 112.

Specifically, after closing the intake valve 120 of the fuel supply cylinder 110a and burning the mixed gas in the combustion chamber of the cylinder 115, immediately before opening the exhaust valve 122 and discharging the exhaust gas, the fuel gas supply unit 112 The fuel valve is opened to supply fuel gas into the combustion chamber. The fuel gas supplied to the combustion chamber is supplied to the exhaust manifold 121 via the exhaust valve 122. As a result, it is possible to avoid a decrease in the total output of the gas consuming device 102.

Alternatively, as another example of the fuel gas discharge configuration of the fuel supply cylinder 110a, the exhaust gas purification device 101 is provided with a fuel gas supply unit during a valve overlap period in which the intake valve 120 and the exhaust valve 122 of the fuel supply cylinder 110a are simultaneously opened. Fuel gas may be supplied by 112.

Specifically, during the valve overlap period, the fuel gas supply unit 112 supplies fuel gas to the distribution path 119 connected to the fuel supply cylinder 110a in the intake manifold 118 of the intake unit 111. Since the intake valve 120 of the fuel supply cylinder 110a is open, the fuel gas is supplied to the combustion chamber of the cylinder 115 of the fuel supply cylinder 110a via the distribution path 119. Further, since the exhaust valve 122 of the fuel supply cylinder 110a is also open, the fuel gas blows through the cylinder 115 of the fuel supply cylinder 110a (passes through) and passes through the exhaust valve 122 and the exhaust manifold 121 together with the exhaust gas to the exhaust path 104. Is discharged to. As a result, it is possible to avoid a decrease in the total output of the gas consuming device 102.

As described above, according to the second embodiment of the present invention, the exhaust gas purification device 101 applied to the gas consuming device 102 that consumes fuel gas and discharges exhaust gas is an exhaust gas that discharges exhaust gas from the gas consuming device 102. The desulfurizing device 105 provided in the path 104 and containing the desulfurizing agent for removing the toxic component contained in the exhaust gas, and the exhaust path 104 in close proximity to or in contact with the desulfurizing device 105 on the downstream side of the desulfurizing device 105 in the exhaust gas discharge direction. At least one fuel supply cylinder out of a plurality of cylinders 110 provided in the gas consuming device 102 at the time of regeneration of the oxidation treatment device 106 provided in the exhaust gas and containing an oxidation catalyst for oxidizing harmful components contained in the exhaust gas and the desulfurization device 105. The mode control unit 131 of the control unit 130 (control unit) that controls the gas consumption device 102 is provided so that the fuel gas supplied to the 110a is discharged to the exhaust path 104.

As a result, according to the exhaust gas purification device 101 of the second embodiment of the present invention, high-concentration fuel gas is discharged through the fuel supply cylinder 110a and oxidized without providing a bypass for introducing the fuel gas into the oxidation treatment device 106. It can be introduced into the processor 106. Further, since the oxidation treatment device 106 transfers the high-temperature oxidation reaction heat generated by the high-concentration fuel gas to the desulfurization device 105, the desulfurization device 105 can be heated without providing a heating means such as a heater or a burner. .. Therefore, the desulfurizing agent of the desulfurizing device 105 can be regenerated at low cost without complicating the configuration and installation of the heating means for heating the desulfurizing device 105. As a result, the exhaust gas purification device 101 can efficiently remove the poisonous component and purify the exhaust gas.

The exhaust gas purification device 101 of the second embodiment of the present invention regenerates the desulfurization device 105 when the integrated amount of the poisoned component accumulated in the desulfurization device 105 exceeds a predetermined threshold value. As a result, the exhaust gas purification device 101 can regenerate the desulfurization device 105 when it detects a decrease in the desulfurization capacity of the desulfurization device 105. Since the integrated amount threshold value of the accumulated amount of the poisonous substance is appropriately set according to the type of the desulfurizing material of the desulfurizing device 105, the desulfurizing device 105 can be regenerated at an appropriate timing for each desulfurizing device 105.

In the exhaust gas purification device 101 of the second embodiment of the present invention, for example, the mode control unit 131 controls the gas consumption device 102 so as to misfire at least one fuel supply cylinder 110a when the desulfurization device 105 is regenerated. As a result, the high-concentration fuel gas can be discharged through the fuel supply cylinder 110a and introduced into the oxidation treatment device 106 without complicated configuration.

Alternatively, when the desulfurizer 105 is regenerated, the mode control unit 131 uses the fuel gas supply unit 112 of the gas consumption device 102 configured as an in-cylinder direct injection type to supply fuel gas to at least one fuel supply cylinder 110a immediately before exhaust gas. The gas consuming device 102 may be controlled so as to supply the gas. As a result, high-concentration fuel gas can be discharged through the fuel supply cylinder 110a and introduced into the oxidation treatment device 106 without reducing the total output of the gas consuming device 102.

Alternatively, the mode control unit 131 is at least one by the fuel gas supply unit 112 of the gas consuming device 102 during the valve overlap period in which the intake valve 120 and the exhaust valve 122 of the cylinder 110 are simultaneously opened at the time of regeneration of the desulfurizer 105. The gas consuming device 102 may be controlled so as to supply fuel gas to one fuel supply cylinder 110a. Also in this case, the high-concentration fuel gas can be discharged through the fuel supply cylinder 110a and introduced into the oxidation treatment device 106 without reducing the total output of the gas consuming device 102.

In the second embodiment, the example in which the exhaust gas purification device 101 is provided with only one desulfurization device 105 on the upstream side of the oxidation treatment device 106 in the exhaust gas discharge direction has been described, but the configuration of the desulfurization device 105 of the present invention has been described. Is not limited to this example.

For example, in the exhaust gas purification device 101 of the third embodiment, as shown in FIGS. 6 and 7, the desulfurization device 105 includes two first desulfurization device 141 and a second desulfurization device 142. In the third embodiment, the description of the same configuration as that of the second embodiment will be omitted.

Each of the first desulfurizer 141 and the second desulfurizer 142 is configured in the same manner as the desulfurizer 105 of the second embodiment. The first desulfurizer 141 and the second desulfurizer 142 are arranged in close proximity to or in contact with the oxidation treatment device 106 with the oxidation treatment device 106 interposed therebetween, and communicate with the oxidation treatment device 106. A temperature sensor 134 for detecting the temperature of the desulfurizer 105 is provided for each of the first desulfurizer 141 and the second desulfurizer 142.

The oxidation treatment device 106 transfers the heat of oxidation reaction generated when the exhaust gas is oxidized to the first desulfurization device 141 or the second desulfurization device 142 which is in close contact with or in contact with the first desulfurization device 141 or the second desulfurization device 142. The second desulfurizer 142 is heated and regenerated. The oxidation treatment device 106 may include a transmission member that transfers the heat of the oxidation reaction to the first desulfurization device 141 and the second desulfurization device 142.

The exhaust gas purification device 101 has a first branch path 143 and a second branch path 144 branched from the exhaust path 104 at the same branch position. The exhaust path 104 has a gas consuming device 102 side from the branch position, that is, an upstream side exhaust path 104a, and an outside air side from the branch position, that is, a downstream side exhaust path 104b, and the exhaust path 104 and the first branch path 143. A cross-shaped path is formed by the second branch path 144 and the second branch path 144. The first desulfurizer 141 and the second desulfurizer 142 are connected to the first branch path 143 and the second branch path 144, respectively. Note that FIGS. 6 and 7 show an example in which the downstream exhaust path 104b passes through the back surface side of the oxidation processor 106, that is, the downstream exhaust path 104b is not connected to the oxidation processor 106. By arranging the downstream exhaust path 104b adjacent to the oxidation treatment device 106, the heat retention of the oxidation treatment device 106 can be enhanced by the exhaust gas flowing through the downstream exhaust path 104b.

The exhaust gas purification device 101 of the third embodiment has a first flow path 145 (see FIG. 6) via the first branch path 143 from the upstream exhaust path 104a as a flow path for discharging the exhaust gas from the gas consuming device 102. It has a second flow path 146 (see FIG. 7) via the second branch path 144 from the upstream side exhaust path 104a. In the first flow path 145, the exhaust gas is introduced from the first branch path 143 to the first desulfurizer 141, the oxidation treatment device 106 and the second desulfurizer 142, and goes through the second branch path 144 to the downstream exhaust path 104b. Is discharged to. In the second flow path 146, the exhaust gas is introduced from the second branch path 144 to the second desulfurizer 142, the oxidation treatment device 106 and the first desulfurizer 141, and is passed through the first branch path 143 to the downstream exhaust path 104b. Is discharged to.

The exhaust gas purification device 101 of the third embodiment includes a switching unit 147 at a branch position to the first desulfurizer 141 and the second desulfurizer 142 in the exhaust path 104. The switching unit 147 is composed of a valve, a damper, or the like that opens and closes the flow path. The switching unit 147 has a three-way valve that outputs the first branch path 143 or the second branch path 144 to the upstream exhaust path 104a, and the first branch path 143 or the second branch path 143 or the second branch path 144b to the downstream exhaust path 104b. It may be composed of a three-way valve having a branch path 144 as an input. The switching unit 147 is connected to the control unit 130 and is controlled by the mode control unit 131 to switch between the first flow path 145 and the second flow path 146.

For example, when switching to the first flow path 145, as shown in FIG. 6, the switching unit 147 closes the second branch path 144 and the downstream side exhaust path 104b when viewed from the upstream side exhaust path 104a, and at the same time, the downstream side exhaust. The upstream exhaust path 104a and the first branch path 143 when viewed from the path 104b are blocked. As a result, the switching unit 147 communicates the upstream side exhaust path 104a and the first branch path 143, and also communicates the second branch path 144 and the downstream side exhaust path 104b.

On the other hand, when switching to the second flow path 146, as shown in FIG. 7, the switching unit 147 closes the first branch path 143 and the downstream side exhaust path 104b when viewed from the upstream side exhaust path 104a, and at the same time, the downstream side exhaust. The upstream exhaust path 104a and the second branch path 144 when viewed from the path 104b are blocked. As a result, the switching unit 147 communicates the upstream side exhaust path 104a and the second branch path 144, and also communicates the first branch path 143 and the downstream side exhaust path 104b.

In the third embodiment, the condition for the mode control unit 131 to switch the operation mode to the normal mode or the reproduction mode may be set in the same manner as in the second embodiment.

The exhaust gas discharge operation in the normal mode of the third embodiment will be described below. When the operation mode is switched to the normal mode, the mode control unit 131 switches to the first flow path 145 by the switching unit 147. The exhaust gas flowing through the first flow path 145 is first introduced into the first desulfurization device 141, the poisonous component of the exhaust gas is adsorbed by the first desulfurization device 141, and the exhaust gas after desulfurization is discharged from the first desulfurization device 141. Desulfurization. The exhaust gas discharged from the first desulfurization device 141 is introduced into the oxidation treatment device 106, harmful components of the exhaust gas are removed by the oxidation treatment device 106, and the purified exhaust gas is discharged from the oxidation treatment device 106. The purified exhaust gas is discharged to the downstream exhaust path 104b via the second desulfurizer 142 and the second flow path 146.

The exhaust gas discharge operation in the regeneration mode of the third embodiment will be described below. When the operation mode is switched to the reproduction mode, the mode control unit 131 switches to the second flow path 146 by the switching unit 147. In the regeneration mode, the exhaust gas containing the fuel gas having a higher concentration than that in the normal mode is discharged from the gas consuming device 102 and flows through the second flow path 146 of the exhaust path 104. The exhaust gas flowing through the second flow path 146 is first introduced into the second desulfurization device 142, the poisonous component of the exhaust gas is adsorbed by the second desulfurization device 142, and the exhaust gas after desulfurization is discharged from the second desulfurization device 142. Desulfurization. At this time, the exhaust gas after desulfurization still contains a high concentration fuel gas.

The exhaust gas discharged from the second desulfurization device 142 is introduced into the oxidation treatment device 106, the harmful components of the exhaust gas are removed by the oxidation treatment device 106, and the purified exhaust gas is discharged from the oxidation treatment device 106. At this time, high-concentration hydrocarbons contained in the fuel gas in the exhaust gas are oxidized by the oxidation catalyst of the oxidation treatment device 106, high-temperature oxidation reaction heat is generated and transferred to the first desulfurization device 141, and the first desulfurization device is used. The desulfurization agent of 141 is heated. In the first desulfurizer 141, the desulfurizing agent in which the toxic substance is accumulated is heated by the oxidation reaction heat of the oxidation treatment device 106, and the toxic substance is desorbed from the desulfurizing agent, whereby the desulfurizing agent of the first desulfurizing apparatus 141 is released. Will be played. The purified exhaust gas introduced into the first desulfurizer 141 is discharged together with the desorbed poisonous substance, and is discharged to the downstream exhaust path 104b via the first flow path 145.

Further, after the mode control unit 131 finishes the reproduction of the first desulfurizer 141 in the reproduction mode, the operation mode is switched from the reproduction mode to the normal mode, and the operation mode is switched to the first flow path 145 by the switching unit 147.

As described above, in the third embodiment, the first desulfurizer 141 or the second desulfurizer 142 is always arranged on the upstream side of the oxidation treatment device 106 in the exhaust gas discharge direction in both the normal mode and the regeneration mode. Therefore, it is possible to always avoid the introduction of the toxic substance of the exhaust gas into the oxidation treatment device 106. Further, in the regeneration mode, the exhaust gas can be desulfurized by the second desulfurization device 142 on the upstream side of the oxidation treatment device 106 in the discharge direction, and the first desulfurization device 141 on the downstream side of the oxidation treatment device 106 can be regenerated. ..

In the third embodiment, an example in which the switching unit 147 switches to the first flow path 145 in the normal mode and switches to the second flow path 146 in the reproduction mode has been described, but the present invention is not limited to this example. That is, the present invention does not limit the flow paths used in the normal mode and the reproduction mode to the first flow path 145 and the second flow path 146, respectively, and may use the first flow path 145 or the second flow path 146 as necessary. May be selectively switched.

In another example of the third embodiment, the switching unit 147 may be switched to the second flow path 146 in the normal mode, while switching to the first flow path 145 in the reproduction mode. In this case, the flow of the exhaust gas is in the opposite direction to the above-mentioned example, and the functions of the first desulfurization device 141 and the second desulfurization device 142 are also reversed, but the same effect as the above-mentioned example is obtained. Even in this case, in both the normal mode and the regeneration mode, the first desulfurizer 141 or the second desulfurizer 142 is always arranged on the upstream side of the oxidation treatment device 106 in the exhaust gas discharge direction, so that the exhaust gas is a poisonous substance. Can always be avoided from being introduced into the oxidation treatment device 106. Further, in the regeneration mode, the second desulfurization device 142 on the downstream side of the oxidation treatment device 106 can be regenerated while the exhaust gas is desulfurized by the first desulfurization device 141 on the upstream side of the oxidation treatment device 106 in the discharge direction. ..

The mode control unit 131 monitors the frequency of use of the first desulfurizer 141 in normal operation when the first flow path 145 is used in the normal mode, and when the frequency of use reaches a predetermined frequency threshold value, the mode control unit 131 monitors the frequency of use. You may switch to use the second flow path 146 in normal mode. Similarly, when the second flow path 146 is used in the normal mode, the mode control unit 131 monitors the frequency of use of the second desulfurizer 142 in the normal operation, and the frequency of use reaches a predetermined frequency threshold value. In some cases, the normal mode may be switched to use the first flow path 145. The frequency of use of the first desulfurizer 141 or the second desulfurizer 142 is, for example, the operating time of the gas consuming device 102, the engine rotation speed, the total usage time of the first desulfurizer 141 or the second desulfurizer 142, or the flow rate of the exhaust gas. , The number of regenerations, the total regeneration time, the total integrated amount of poisonous substances, and the like may be used for determination.

Further, in the third embodiment, an example in which the mode control unit 131 is switched to the first flow path 145 by the switching unit 147 after the reproduction of the first flow path 145 is completed in the reproduction mode has been described. Not limited to. In another example, even if the operation mode is switched from the reproduction mode to the normal mode after the reproduction of the first flow path 145 is completed in the reproduction mode, the mode control unit 131 does not switch to the first flow path 145 and is the second flow. The second flow path 146 may be used in normal mode while maintaining the path 146. Similarly, even if the operation mode is switched from the reproduction mode to the normal mode after the reproduction of the second flow path 146 is completed in the reproduction mode, the mode control unit 131 does not switch to the second flow path 146 and the first flow path 145. The first flow path 145 may be used in the normal mode.

In the third embodiment, as a condition for switching to the regeneration mode, when the temperature rise amount of the exhaust gas passing through the oxidation treatment device 106 is determined in the same manner as in the second embodiment, the first branch path is located in the vicinity of the first desulfurizer 141. The 143 is equipped with a first temperature sensor 148, and the second branch path 144 is provided with a second temperature sensor 149 in the vicinity of the second desulfurizer 142. When the first flow path 145 is used in the normal mode, the first temperature sensor 148 and the second temperature sensor 149 are used in the same manner as the input temperature sensor 135 and the output temperature sensor 136 of the second embodiment. On the other hand, when the second flow path 146 is used in the normal mode, the first temperature sensor 148 and the second temperature sensor 149 are used in the same manner as the output temperature sensor 136 and the input temperature sensor 135 of the second embodiment.

Further, in the third embodiment, as a condition for switching to the regeneration mode, when the predetermined component of the exhaust gas that has passed through the oxidation treatment device 106 is determined in the same manner as in the second embodiment, the first branch is made in the vicinity of the first desulfurizer 141. The first exhaust gas sensor 150 is provided in the path 143, and the second exhaust gas sensor 151 is provided in the second branch path 144 in the vicinity of the second desulfurizer 142. When the first flow path 145 is used in the normal mode, the first exhaust gas sensor 150 is used in the same manner as the exhaust gas sensor 137 of the second embodiment. On the other hand, when the second flow path 146 is used in the normal mode, the second exhaust gas sensor 151 is used in the same manner as the exhaust gas sensor 137 of the second embodiment.

In the third embodiment in which the first desulfurizer 141, the oxidation treatment device 106, and the second desulfurizer 142 are arranged in series, the first branch path 143 for introducing the exhaust gas into the first desulfurizer 141 in the normal mode is in the regeneration mode. It also serves as a route for discharging the exhaust gas purified by the oxidation treatment device 106 from the first desulfurization device 141. Further, in the third embodiment, the second branch path 144 for introducing the exhaust gas to the second desulfurizer 142 in the regeneration mode discharges the exhaust gas purified by the oxidation treatment device 106 in the normal mode from the second desulfurizer 142. Is also used. However, in the present invention, the route for discharging the exhaust gas purified by the oxidation treatment device 106 is not limited to the example in which the first branch path 143 and the second branch path 144 are also used as in the third embodiment.

For example, as shown in FIG. 8, the exhaust gas purification device 101 of the fourth embodiment includes a third branch path 160 for discharging the exhaust gas purified by the oxidation treatment device 106 from the second desulfurization device 142 in the normal mode. Further, as shown in FIG. 9, the exhaust gas purification device 101 of the fourth embodiment includes a fourth branch path 161 for discharging the exhaust gas purified by the oxidation treatment device 106 in the regeneration mode from the first desulfurization device 141. In the fourth embodiment, the description of the configuration similar to that of the second embodiment or the third embodiment will be omitted.

The third branch path 160 is provided by branching from the first branch path 143 and joins the downstream exhaust path 104b. The fourth branch path 161 is provided by branching from the second branch path 144 and joins the downstream exhaust path 104b. In the exhaust path 104, the upstream exhaust path 104a is branched into the first branch path 143 and the second branch path 144, but is not directly connected to the downstream exhaust path 104b.

In the fourth embodiment, the first flow path 145 and the second flow path 146 that discharge the exhaust gas from the gas consuming device 102 are different from the third embodiment. In the first flow path 145 from the upstream exhaust path 104a via the first branch path 143, as shown in FIG. 8, the exhaust gas is discharged from the first branch path 143 to the first desulfurizer 141, the oxidation treatment device 106 and the second. It is introduced into the desulfurizer 142 and discharged to the downstream exhaust path 104b via the fourth branch path 161. Further, in the second flow path 146 from the upstream exhaust path 104a via the second branch path 144, as shown in FIG. 9, the exhaust gas is discharged from the second branch path 144 to the second desulfurizer 142, the oxidation treatment device 106 and the oxidation treatment device 106. It is introduced into the first desulfurizer 141 and discharged to the downstream exhaust path 104b via the third branch path 160.

In the fourth embodiment, the configuration for switching the flow path for discharging the exhaust gas from the gas consuming device 102 is different from the switching unit 147 in the third embodiment. The exhaust gas purification device 101 includes a first switching unit 162 in the first branch path 143 in the vicinity of the upstream exhaust path 104a, and a second switching unit 163 in the second branch path 144 in the vicinity of the upstream exhaust path 104a. .. Further, the exhaust gas purification device 101 includes a third switching section 164 in the third branch path 160 in the vicinity of the first branch path 143, and a fourth switching section 165 in the fourth branch path 161 in the vicinity of the second branch path 144. To prepare for.

The first switching unit 162, the second switching unit 163, the third switching unit 164, and the fourth switching unit 165 are composed of valves, dampers, and the like that open and close the flow path. The first switching unit 162 and the second switching unit 163 may be configured by a three-way valve having the first branch path 143 or the second branch path 144 as an output with respect to the upstream exhaust path 104a. The first switching unit 162, the second switching unit 163, the third switching unit 164, and the fourth switching unit 165 are connected to the control unit 130 and are controlled by the mode control unit 131 to open and close each route. Switch. The first switching unit 162 switches between discharging and shutting off the exhaust gas to the first branch path 143, and the second switching unit 163 switches between discharging and shutting off the exhaust gas to the second branch path 144. The third switching unit 164 switches between discharging and shutting off the exhaust gas to the third branch path 160, and the fourth switching unit 165 switches between discharging and shutting off the exhaust gas to the fourth branch path 161.

For example, when switching to the first flow path 145, as shown in FIG. 8, the first switching section 162 opens the first branch path 143 and the second switching section 163 blocks the second branch path 144. The upstream exhaust path 104a and the first branch path 143 are communicated with each other. Further, the third switching section 164 blocks the third branch path 160 and the fourth switching section 165 opens the fourth branch path 161 so that the fourth branch path 161 and the downstream exhaust path 104b communicate with each other. At this time, the mode control unit 131 may control the first switching unit 162 and the second switching unit 163 so that the first branch path 143 is opened and the second branch path 144 is closed at the same time. Further, the mode control unit 131 may control the third switching unit 164 and the fourth switching unit 165 so that the third branch path 160 is closed and the fourth branch path 161 is opened at the same time.

On the other hand, when switching to the second flow path 146, as shown in FIG. 9, the first switching section 162 blocks the first branch path 143 and the second switching section 163 opens the second branch path 144. The upstream exhaust path 104a and the second branch path 144 are communicated with each other. Further, the third switching section 164 opens the third branch path 160 and the fourth switching section 165 closes the fourth branch path 161 so that the third branch path 160 and the downstream exhaust path 104b communicate with each other. At this time, the mode control unit 131 may control the first switching unit 162 and the second switching unit 163 so that the first branch path 143 is closed and the second branch path 144 is opened at the same time. Further, the mode control unit 131 may control the third switching unit 164 and the fourth switching unit 165 so that the third branch path 160 is opened and the fourth branch path 161 is closed at the same time.

In the fourth embodiment, the condition for the mode control unit 131 to switch the operation mode to the normal mode or the reproduction mode may be set in the same manner as in the third embodiment. The first flow path 145 and the second flow path 146 of the fourth embodiment function in the same manner as the third embodiment. Since the exhaust gas discharge operation in the normal mode and the regeneration mode of the fourth embodiment is the same as that of the third embodiment, the description thereof will be omitted. Further, also in the fourth embodiment, the flow paths used in the normal mode and the reproduction mode are not limited to the first flow path 145 and the second flow path 146, respectively, and the first flow path 145 is the same as in the third embodiment. And the second flow path 146 may be selectively switched as needed.

As described above, according to the third embodiment or the fourth embodiment of the present invention, in the exhaust gas purification device 101, the desulfurization device 105 has a first desulfurization device 141 and a second desulfurization device 142, and is an oxidation treatment device. The 106 is provided between the first desulfurizer 141 and the second desulfurizer 142. The mode control unit 131 includes a first flow path 145 that discharges exhaust gas in the order of the first desulfurizer 141, the oxidation treatment device 106, and the second desulfurization device 142, and the second desulfurization device 142, the oxidation treatment device 106, and the first desulfurization device. The second flow path 146 that discharges the exhaust gas is switched in the order of 141.

As a result, according to the exhaust gas purification device 101 of the present invention, the first desulfurizer 141 or the second desulfurizer 142 is always arranged on the upstream side of the oxidation treatment device 106 in the exhaust gas discharge direction, so that the toxic substance of the exhaust gas Can always be avoided from being introduced into the oxidation treatment device 106. Further, in the regeneration mode, the exhaust gas is desulfurized by the first desulfurizer 141 or the second desulfurizer 142 on the upstream side of the oxidation treatment device 106 in the discharge direction, while the exhaust gas is desulfurized on the downstream side of the oxidation treatment device 106 or the second desulfurization device 142. Can be played. As a result, the exhaust gas purification device 101 can more efficiently remove the poisonous component and purify the exhaust gas.

According to the exhaust gas purification device 101 of the third embodiment or the fourth embodiment of the present invention, when the mode control unit 131 starts the regeneration of the desulfurization device 105, the first flow path 145 and the second flow path 146 When the regeneration of the desulfurizer 105 is completed, the first flow path 145 and the second flow path 146 are further switched. As a result, after switching from the regeneration mode to the normal mode, the regenerated first desulfurizer 141 or second desulfurizer 142 is always arranged on the upstream side of the oxidation treatment device 106 in the exhaust gas discharge direction. Therefore, in the restarted normal mode, desulfurization can be performed by the refreshed first desulfurization device 141 or the second desulfurization device 142, and the poisonous component can be removed more efficiently.

The present invention can be appropriately modified within the scope of the claims and within the scope not contrary to the gist or idea of the invention that can be read from the entire specification, and the exhaust gas purification system and the exhaust gas purification device accompanied by such changes are also the present invention. It is included in the technical idea of the invention.

1 Exhaust gas purification system 2,102 Gas consumption device 3,103 Supply path 4,104 Exhaust path 5,105 Desulfurizer 6,106 Oxidation processor 7 Bypass path 8 Switching unit 9 Heat exchanger 10 Cylinder 10a Fuel supply cylinder 10b

Normal cylinder

20, 130

Control unit

21, 131

Mode control unit

100, 101 Exhaust gas purification device

Claims

An exhaust gas purification system applied to gas consuming equipment that consumes fuel gas and emits exhaust gas.
A desulfurizer containing a desulfurizing agent that removes the toxic component contained in the fuel gas, and
An oxidation treatment device provided in an exhaust path for discharging the exhaust gas from the gas consuming device and containing an oxidation catalyst for oxidizing harmful components contained in the exhaust gas that has passed through the exhaust path.
Bypass path branched from the exhaust path and
A switching unit provided in the exhaust path and switching the exhaust destination of the exhaust gas from the oxidation treatment device to the bypass path when the desulfurizer is regenerated.
An exhaust gas purification system characterized by being equipped with.
The exhaust gas according to claim 1, wherein the desulfurizer accommodates the desulfurizing agent that adsorbs the poisonous component by physical adsorption, and is provided in a supply path for supplying the fuel gas to the gas consuming device. Purification system.
2. The second aspect of the invention is characterized in that the heat exchanger is further provided, which is connected to the bypass path and heats the desulfurizer by heat exchange using the exhaust gas flowing through the bypass path when the desulfurizer is regenerated. The described exhaust gas purification system.
The integrated amount of the poisoned component accumulated in the desulfurizer is calculated based on the supply amount of the fuel gas supplied to the gas consuming device or the exhaust gas amount of the exhaust gas discharged from the gas consuming device. The exhaust gas purification system according to any one of claims 1 to 3, wherein when the integrated amount exceeds a predetermined threshold value, regeneration of the desulfurizer is started.
An exhaust gas purification device applied to gas consumption devices that consume fuel gas and discharge exhaust gas.
A desulfurizer containing a desulfurizing agent that removes the toxic component contained in the fuel gas, and
An oxidation treatment device provided in an exhaust path for discharging the exhaust gas from the gas consuming device and containing an oxidation catalyst for oxidizing harmful components contained in the exhaust gas that has passed through the exhaust path.
Bypass path branched from the exhaust path and
A switching unit provided in the exhaust path and switching the exhaust destination of the exhaust gas from the oxidation treatment device to the bypass path when the desulfurizer is regenerated.
An exhaust gas purification device characterized by being equipped with.
An exhaust gas purification device applied to gas consumption devices that consume fuel gas and discharge exhaust gas.
A desulfurizer provided in the exhaust path for discharging the exhaust gas from the gas consuming device and containing a desulfurizing agent for removing the toxic component contained in the exhaust gas, and a desulfurizer.
An oxidation treatment device provided in the exhaust path in the vicinity of or in contact with the desulfurization device on the downstream side of the desulfurization device in the exhaust gas discharge direction and containing an oxidation catalyst for oxidizing harmful components contained in the exhaust gas.
A control unit that controls the gas consuming device so that the fuel gas supplied to at least one of the plurality of cylinders provided in the gas consuming device is discharged to the exhaust path when the desulfurizer is regenerated. When,
An exhaust gas purification device characterized by being equipped with.
The exhaust gas purification device according to claim 6, wherein the desulfurizer is regenerated when the accumulated amount of the poisoned component accumulated in the desulfurizer exceeds a predetermined threshold value.
The exhaust gas purification device according to claim 6 or 7, wherein the control unit controls the gas consuming device so as to misfire the at least one cylinder when the desulfurizer is regenerated.
When the desulfurizer is regenerated, the control unit causes the fuel gas supply unit of the gas consuming device, which is composed of an in-cylinder direct injection type, to supply the fuel gas to the at least one cylinder immediately before exhaust gas. The exhaust gas purification device according to claim 6 or 7, wherein the gas consuming device is controlled.
During the valve overlap period in which the intake valve and the exhaust valve of the cylinder are simultaneously opened at the time of regeneration of the desulfurizer, the control unit is subjected to the fuel to the at least one cylinder by the fuel gas supply unit of the gas consuming device. The exhaust gas purification device according to claim 6 or 7, wherein the gas consuming device is controlled so as to supply gas.
The desulfurizer has a first desulfurizer and a second desulfurizer.
The oxidation treatment device is provided between the first desulfurization device and the second desulfurization device.
The control unit includes a first flow path for discharging the exhaust gas in the order of the first desulfurizer, the oxidation treatment device, and the second desulfurization device, the second desulfurization device, the oxidation treatment device, and the first desulfurization device. The exhaust gas purification device according to any one of claims 6 to 10, wherein the second flow path for discharging the exhaust gas is switched in this order.
The control unit switches between the first flow path and the second flow path when starting the regeneration of the desulfurization device, and when the regeneration of the desulfurization device is completed, the first flow path and the first flow path. The exhaust gas purification device according to claim 11, wherein the two flow paths are further switched.