JP5632646B2 - Exhaust gas purification device - Google Patents

Description

  The present invention captures particulate matter (PM), which is a harmful substance such as soot, SOF, and sulfate, contained in exhaust gas discharged from a diesel engine used in, for example, ships, industrial machinery, and vehicles, with a filter. The present invention relates to an exhaust gas purifying device that collects, incinerates and disappears the particulate matter, and purifies exhaust gas.

  Diesel engines have high thermal efficiency, and as a result, the spread of diesel vehicles will contribute to the prevention of global warming. In addition, carbon-based particulate matter emitted from diesel engines and particulate matter (or PM), which are harmful substances such as organic compounds, are harmful to the human body. Is regulated. Therefore, many filters for collecting particulate matter in exhaust gas discharged from a diesel engine have been proposed. As a conventional diesel particulate filter, that is, an exhaust gas purification device, a filter having a honeycomb structure made of porous ceramics or a filter having a structure in which ceramic fibers are laminated is used. For automobiles, it is common to collect PM with a ceramic honeycomb and gradually burn the particulate matter from about 300 ° C. using a catalytic action so that the particulate matter in the exhaust gas disappears. In this case, the sulfur concentration of the fuel needs to be 50 ppm or less because the catalyst is non-poisoned by sulfur in the exhaust gas and loses its activity. In addition, when the filter collects particulate matter, particles of particulate matter are caught on the filter of the ceramic fiber material, and these particles gradually increase and accumulate while filling the gaps between adjacent fiber materials. Go. In addition, a filter that collects particulate matter must be regenerated by incinerating the particulate material, and at that time, the heater must be energized to heat the particulate material to incinerate and regenerate the filter. I must. In this case, since no catalyst is used, it is not affected by the sulfur concentration in the fuel.

  Conventionally, a filter that constitutes a diesel particulate filter is made of a ceramic nonwoven fabric. The diesel particulate filter is a filter made of ceramic nonwoven fabric that collects particulate matter in the exhaust gas, which reduces the fiber scattering property of the ceramic nonwoven fabric and improves the durability and corrosion resistance. The ceramic filter is formed in a cylindrical shape by bending it in the circumferential direction between the inner and outer sides with a ceramic nonwoven fabric, adjusting the basis weight fiber length of the ceramic nonwoven fabric, and collecting the particulate matter collected by the filter. A wire mesh heater is disposed on the exhaust gas inflow side of a felt made of a ceramic non-woven fabric for heating and incineration, and the entire surface of the felt on the exhaust gas inflow side is surrounded by the wire mesh heater (see, for example, Patent Document 1).

  Further, as a conventionally known particulate filter, a corrugated concave portion and a cylindrical first means having a concave portion engaging with the convex portion are provided inside each filter at each end of the filter, and the filter A second means having a convex part formed in a corrugated concave part is provided on the outside, and a cylindrical fastening means for fastening the filter in the thickness direction is provided outside the second means (for example, a patent) Reference 2).

  Further, as an exhaust gas purifying device, there is known an exhaust gas purifying device that divides a heater into two in the longitudinal direction of the filter and sequentially energizes the heater to reduce voltage and power consumption. The filter has a five-layer structure including a ceramic nonwoven fabric on the upstream and downstream sides of the internal exhaust gas flow, a metal mesh on both sides, and a heater disposed in the ceramic nonwoven fabric. The heater is composed of an inlet side heater and an outlet side heater that are divided into an exhaust gas inlet side and an exhaust gas outlet side in the longitudinal direction of the filter. After the side part is regenerated, the outlet side heater is energized to control the outlet side part of the filter (see, for example, Patent Document 3).

  Further, as an exhaust gas purification device, a device in which the shape of a filter formed in a corrugated shape is held by a frame reinforcing member is known. The filter is formed in a corrugated cylinder, and the cylinder is reinforced and held by a frame reinforcing member. The reinforcing member for frame includes a disk member disposed at an end of the housing on the exhaust gas inflow side, a ring member disposed at an end of the exhaust gas outflow side and a predetermined position in the longitudinal direction of the filter, and the disk member And a ring-shaped frame disposed between the protrusions and the ring member at the end. The disk member and the ring member are provided with protrusions having shapes corresponding to the inner peripheral side ridges of the cylindrical body on the outer periphery (see, for example, Patent Document 4).

JP 7-286510 A JP-A-8-144738 JP 2003-172127 A JP 2003-172128 A

  By the way, in the conventional exhaust gas purification apparatus, the sulfur concentration contained in the light oil for automobiles is about 10 ppm, and the catalyst carried on the filter is hardly deteriorated, and the function of purifying the exhaust gas is achieved. However, fuels for large diesel engines used in ships and the like are generally heavy oil A or heavy oil C, and these fuels have a high sulfur concentration of 1% or more. The catalyst type used in the apparatus has a problem that the catalyst deteriorates with sulfur in a short time, the catalyst function is lost, and it does not function.

  Also, in the exhaust gas purification device, when a particulate matter is collected with a ceramic honeycomb type filter without using a catalyst, and the amount of particulate matter collected increases and the pressure loss reaches a certain measured value, A type has been proposed in which collection is suspended and the particulate matter collected by pressure or backwashing with compressed air from the outlet side of the filter is discharged from the filter and removed. It is difficult to dispose of the material. For example, it is necessary to pack the particulate matter obtained by backwashing manually into a drum can, and it is necessary to incinerate the particulate matter collected in the drum can in an incinerator. However, there is a problem that the ship cannot legally incinerate particulate matter, and it is necessary to transport the particulate matter to land, and during that time, it is necessary to store drums.

  In addition, in a conventional exhaust gas purification device using a ceramic nonwoven fabric, when a diesel engine is operated using A heavy oil or C heavy oil as a fuel, a particulate matter is generated by energizing a heater embedded in the ceramic nonwoven fabric during filter regeneration. In the case of incineration, when the filter is formed into a filter bellows shape, the recesses on the inner peripheral side are locally hotter than the convexes on the outer peripheral side, and there is a difference between the convexes on the outer peripheral side and the concave portions on the inner peripheral side. There was a problem that the temperature difference occurred between them, that is, a high-heat part was locally generated in the filter, and the filter was burnt out or corroded, thereby impairing durability.

  The object of the present invention is to solve the above-mentioned problem, and particulate matter (PM), which is a harmful substance such as soot, SOF, and sulfate, contained in exhaust gas discharged from a diesel engine is collected by a filter. The particulate matter is incinerated by energizing the heater, and the heater is also arranged on the outer peripheral side of the filter in order to heat and incinerate the particulate matter collected on the ceramic nonwoven fabric constituting the filter. By adopting a special configuration, the temperature difference between the outer peripheral area upstream of the filter and the inner peripheral area downstream of the filter is reduced, and heating is performed in a relatively uniform low-temperature area throughout the filter, ensuring particulate matter is evenly ensured. Incineration is carried out to achieve a regeneration time in a short time, and the occurrence of local high-temperature regions in the ceramic nonwoven fabric of the filter is suppressed, for example, outside the bellows-like filter disclosed in Patent Document 3 If the tip of the convex portion on the side is 600 ° C., the conventional exhaust gas purification device has a temperature difference of 800 ° C. to 900 ° C. at the concave portion on the inner peripheral side, and a large difference in temperature distribution occurs. By providing an outer peripheral heater, a uniform combustion temperature state can be ensured throughout the filter and the filter can be regenerated, and the durability of the filter can be improved. For example, A is a fuel for large diesel engines used in ships. Vanadium contained in exhaust gas burned with heavy oil or C heavy oil has an adverse effect on the ceramic nonwoven fabric due to the high temperature, that is, when the combustion temperature of particulate matter exceeds 800 ° C, vanadium attacks the ceramic nonwoven fabric such as silicon carbide. Therefore, it is possible to suppress the generation of the uneven combustion temperature state, secure low-temperature combustion throughout the filter, and regenerate the filter. It is to provide an exhaust gas purification device that.

According to the present invention, particulate matter such as soot and SOF contained in the exhaust gas is collected by a filter housed in a housing disposed in an exhaust gas passage for exhausting exhaust gas from a diesel engine. In an exhaust gas purifying apparatus for purifying the exhaust gas by incinerating the particulate matter collected in
The filter is formed by bending a laminated body composed of a wire mesh heater energized during regeneration, a pair of ceramic nonwoven fabric sandwiching the wire mesh heater from both sides, and a pair of supporting wire mesh laminated on the outside of the ceramic nonwoven fabric in a bellows shape. It is composed of a cylindrical body molded into a cylindrical shape,
Includes an outer heater inner peripheral side placed has been framework reinforcing member, and disposed with a gap in the housing on an outer peripheral side of the cylindrical body of the cylindrical body,
At least one end of the cylindrical body constituting the filter is spring-supported by the housing, and the outer peripheral heater disposed on the outer peripheral side of the filter has a calorific value at both ends of the outer peripheral heater at a central portion. It is configured to be larger than the calorific value,
The outer peripheral heater is composed of a plurality of metal rod heaters, and at least one end is elastically supported by the housing by a spring member and extends in the longitudinal direction of the filter, and is constrained in the longitudinal direction with respect to the filter. It is configured to allow thermal deformation without being
The exhaust gas is allowed to flow through the filter, and the particulate matter contained in the exhaust gas is collected by the filter, and the particulate matter collected by the filter during regeneration of the filter is collected by the wire mesh heater and the outer periphery. The present invention relates to an exhaust gas purifying apparatus that purifies the exhaust gas by heating and incinerating the particulate matter by energizing a heater and performing uniform low temperature combustion over the entire area of the filter .

Further, the rod-shaped heater before constituting the Kigaishu heater, at least one end is fitted through the gap in a ring shaped guide hole mounted on said housing, said rod-shaped heater is constrained in the longitudinal direction relative to said housing Without being limited, the rod-shaped heater is allowed to be thermally deformed . In a further, the peripheral heater formed of the metallic rod heaters are those that are composed of a longitudinally fixed along the resistance adjusting plate of the rod-shaped heater body and the heater body.

In the exhaust gas purifying apparatus, prior SL filter is the is also installable configured to vertical position relative to the base to install the filter.

  Since this exhaust gas purifying apparatus is configured as described above, when the filter is regenerated, by energizing the wire mesh heater and the outer peripheral heater provided on the outer periphery of the filter and heating the convex side of the outer periphery of the filter, In the type in which the exhaust gas flow is from the outer peripheral side to the inner peripheral side of the filter body, the combustion temperature of harmful substances such as particulate matter before and after the filter, that is, the convex part on the outer peripheral side and the concave part on the inner peripheral side of the bellows-like filter Is adjusted to a temperature in the vicinity of 600 ° C. or more, for example, the combustion temperature is about 650 ° C. at the center of the filter, resulting in a substantially uniform and appropriate temperature distribution, eliminating the temperature difference between the convex and concave portions of the filter. A resistance adjustment plate can be installed on the outer heater to increase the amount of heat generated at both ends, minimizing the difference in the combustion temperature in the radial direction of the filter and allowing low temperature combustion throughout the filter. It is possible to prevent deterioration due to vanadium such as ceramic nonwoven fabric formed. In other words, this exhaust gas purification device has a sufficient amount of electricity in large diesel engines used in ships and the like, so there is no hindrance to heating of the outer heater, the structure itself is simplified, and vanadium or the like is produced by low-temperature combustion. It is possible to prevent the filter from being deteriorated by the substance and to purify the exhaust gas, and the apparatus itself can be configured with a simple structure with high strength, and the manufacturing cost can be reduced. Therefore, in this exhaust gas purification device, it is possible to keep the maximum temperature at about 650 ° C. while ensuring the combustion temperature in the vicinity of the temperature of 600 ° C. or higher necessary for PM combustion in the entire filter. As a result, the silicon carbide fiber However, even if the diesel engine uses A heavy oil or C heavy oil fuel, the effect of ensuring the durability of the filter can be obtained with peace of mind.

It is sectional drawing which shows one implementation of the exhaust-gas purification apparatus by this invention. FIG. 3 is a plan view showing an embodiment of the filter in the exhaust gas purifying apparatus according to the present invention, in which a rod-shaped outer peripheral heater is disposed on the outer periphery of the filter body. FIG. 3 is an end view showing the filter of FIG. 2. FIG. 4 is an enlarged view showing a region A of the filter shown in FIG. 3. It is an end view which shows one of the B area | regions of the rod-shaped outer periphery heater in the filter of FIG. 3 is a graph showing a heat generation amount J and a current resistance value Ω in the longitudinal direction of the rod-shaped outer peripheral heater shown in FIG. 2. FIG. 6 is a plan view showing another embodiment of the filter in the exhaust gas purifying apparatus according to the present invention, in which a spiral outer peripheral heater is disposed on the outer periphery of the filter body. It is an end view which shows the filter of FIG. It is a graph which shows the temperature distribution at the time of electricity supply of the filter main body which has a wire-mesh heater in this exhaust gas purification apparatus. It is a graph which shows the tensile strength with respect to the temperature of the ceramic nonwoven fabric which comprises a filter. 2 is a graph showing a combustion temperature distribution when a filter is energized in the exhaust gas purification apparatus shown in FIG. 1. It is a perspective view which shows a part of frame reinforcement member integrated in the filter main body in a filter. It is a front view which shows the star-shaped disk member arrange | positioned at the both ends in the reinforcement member for frames shown in FIG. It is a front view which shows the star-shaped ring member arrange | positioned in the intermediate part in the reinforcement member for frames shown in FIG.

  This exhaust gas purification device distributes particulate matter (PM), which is a harmful substance such as soot, SOF, and sulfate contained in exhaust gas discharged from large diesel engines used in ships, industrial machinery, etc., in a housing. The filter is collected by the installed filter, and the PM collected by the filter is heated and incinerated by energizing the heater provided in the filter to regenerate the filter, and is optimal for mounting on a ship. When this exhaust gas purification device is used in a large diesel engine that drives a ship, the filter 1 is in a vertical state with respect to a base (not shown) such as a deck or a storage room where the filter 1 is installed. It is preferable to install and use.

  Embodiments of an exhaust gas purifying apparatus according to the present invention will be described below with reference to the drawings. This exhaust gas purifier captures particulate matter such as soot contained in the exhaust gas G by the filter 1 housed in the housing 10 disposed in the exhaust gas passage 9 for discharging the exhaust gas G from the diesel engine. The particulate matter collected by the filter 1 is incinerated to purify the exhaust gas G. This exhaust gas purification device is characterized by a configuration in which an outer peripheral heater 7 is provided on the outer periphery of the filter 1. This exhaust gas purifying apparatus generally includes a filter body 2 and a cylinder body, each of which is composed of a cylindrical body 3 bent into a bellows shape and formed into a cylindrical shape, and a frame reinforcing member 35 disposed on the inner peripheral side of the cylindrical body 3. The outer peripheral heater 7 is supported in the housing 10 with a gap 24 on the outer peripheral side. One end of the cylindrical body 3 is elastically supported by the housing 10 by a spring support member 29, and the other end is attached to the housing 10 by an exhaust pipe 30 that exhausts clean gas. The cylindrical body 3 constituting the filter 1 is composed of a pair of ceramic nonwoven fabrics 4 having a wire mesh heater 5 having electrodes 23 at both ends sandwiched from both sides, and a pair of ceramic nonwoven fabrics 4 stacked on the outside of the ceramic nonwoven fabric 4. A laminated body composed of the supporting wire mesh 8 is bent into a bellows shape and formed into a cylindrical shape. Specifically, in this exhaust gas purifying device, the outer peripheral portion of the filter main body 2 is shown in an open state, but both end portions of the filter main body 2 are closed by a partition plate 6 to constitute the filter main body 2. The ceramic nonwoven fabric 4 that collects the particulate matter carries a catalyst such as platinum in order to burn the particulate matter at a low temperature or to react and burn it. This exhaust gas purifying apparatus flows exhaust gas G from the outer peripheral side to the inner peripheral side of the filter 1 and collects harmful substances such as soot and the like contained in the exhaust gas G with the filter 1. During regeneration, the wire mesh heater 5 and the outer peripheral heater 7 are energized so that the entire area of the filter 1 is uniformly burned at a low temperature, and harmful substances collected in the filter 1 are incinerated in a short time to purify the exhaust gas G. It is a feature. In FIG. 1, the flow of the exhaust gas G is indicated by arrows.

  The ceramic nonwoven fabric 4 which comprises the cylinder 3 is comprised from nonwoven fabrics, such as a silicon carbide fiber, for example. The wire mesh heater 5 is located at the boundary portion, that is, the central portion of the pair of ceramic nonwoven fabrics 4 located on both sides. The exhaust gas G flows from the exhaust gas passage 9 and flows into the ceramic nonwoven fabric 4 from the outer peripheral portion of the filter 1, PM is removed by the filter 1, and is discharged as clean gas from the inner peripheral side of the ceramic nonwoven fabric 4. Since the pressure loss of the filter 1 increases due to the PM collected in the filter main body 21, when a certain amount of PM is collected, the inflow of the exhaust gas G is stopped, and the wire mesh heater disposed in the central portion of the ceramic nonwoven fabric By energizing 5 and the outer peripheral heater 14, the filter temperature is overheated to around 600 ° C., and by flowing appropriate air therethrough, the collected PM will burn and disappear.

  With respect to the filter body 2 in the filter 1, the temperature of the convex portion 11 and the concave portion 12 of the cylindrical body 3 constituting the filter body 2 when the wire mesh heater 5 is energized for regeneration is as shown in FIG. 9 when only the wire mesh heater 5 is energized. As shown in FIG. 4, when the temperature of the convex portion 11 reaches around 600 ° C., the temperature of the concave portion 12 exceeds 700 ° C., and when PM burns, the temperature is further increased than only energizing the wire mesh heater 5. Rises by about 50 ° C., the temperature of the concave portion 12 of the cylindrical body 3 reaches 750 ° C. or more. Further, as shown in FIG. 9, it can be seen that the temperature at both ends of the filter body 2 is lower than that at the center.

  In addition, when the diesel engine uses A heavy oil, particularly C heavy oil, as a fuel, the strength deterioration of the filter body 2 in the exhaust gas purification device, that is, the ceramic nonwoven fabric 4 becomes severe. As a result of investigating substances that cause a reduction in the strength of various materials contained in the exhaust gas G with respect to silicon carbide constituting the filter body 2, it was found that vanadium exerts a bad influence. FIG. 10 shows the effect of vanadium contained in exhaust gas when a diesel engine is operated with heavy oil A or heavy oil C on fiber strength. A vanadium sulfate solution was applied to silicon carbide fiber and 100 hours at each temperature. The strength was measured after exposure. The strength required for the filter body 2 is 1 GPa, and the strength can be maintained up to 700 ° C., but the strength is 1 GPa or less at 800 ° C. Therefore, it is understood that when the diesel engine uses A heavy oil or C heavy oil as fuel, the maximum temperature should be 650 ° C. to 700 ° C. or lower in order to ensure the strength of the silicon carbide filter in the exhaust gas G. It was. However, in the conventional filter, the temperature difference between the concave portion and the convex portion is 100 ° C. or more, and when the convex portion is about 600 ° C., the concave portion exceeds 700 ° C.

  As shown in FIGS. 1, 2 and 3, the exhaust gas purifying apparatus according to the present invention is designed to reduce the temperature difference between the convex portion 11 and the concave portion 12 of the cylindrical body 3 constituting the filter main body 2, so that the filter main body 2 The outer periphery heater 7 is arranged with a gap 24 on the outer periphery, and the heat generation distribution of the outer periphery heater 7 is increased at both ends of the filter body 2 and decreased toward the center, whereby the protrusions 11 and the recesses 12 of the cylinder 3 are reduced. It is characterized in that it is possible to make the temperature difference between both ends uniform and to minimize the temperature difference between both ends and the center. The outer peripheral heater 7 is composed of a plurality of metal bar heaters 13 which are spaced apart from each other with a gap 25 around the outer periphery of the filter body 2, and the metal bar heater 13 has a rectangular shape as shown in FIG. The heater main body 14 having a box-shaped cross section and a resistance adjusting plate 15 fixed along the longitudinal direction of the heater main body 14 are formed. It consists of a plate-like plate so that the resistance value becomes small. Since the rod-shaped heater 13 has the above-described structure, as shown in FIG. 6, the axial resistance value .OMEGA. (Ohms) is increased at both ends 16 and the intermediate portion 28 is gradually decreased, resulting in a central portion. 17 becomes smaller. Further, the rod-shaped heater 13 has a heat generation amount J (joule) in the axial direction that is larger at both end portions 16 and smaller at the central portion 17. In general, since the heat generation amount = current × current × resistance value, the current value of the rod heater 13 is the same everywhere, but the heat generation amount in the central portion where the resistance adjustment plate 15 has a small resistance value can be reduced. it can. That is, in the filter 1 in which the outer peripheral heater 7 is arranged on the outer periphery of the filter body 2, as shown in FIG. 11, the temperature distribution between the concave portion 12 and the convex portion 11 of the cylindrical body 3 becomes small, and 600 ° C. to 650 ° C. It can be seen that the ceramic nonwoven fabric 4 is not deteriorated in the temperature range of ° C. That is, in the filter 1, by optimizing the heat generation distribution of the rod heater 13 of the outer peripheral heater 7, the temperature difference between the concave portion 12 and the convex portion 11 of the cylindrical body 3 is about 20 ° C., and the maximum temperature difference in the axial direction is also It can be reduced to about 40 ° C.

  FIG. 1 shows a structure in which a rod heater 13 as an outer peripheral heater 7 is attached to a housing 10 in order to constitute the filter 1 in this exhaust gas purification apparatus. When the outer heater 7 is energized, the rod heater 13 of the outer heater 7 is thermally expanded. If the elongation of the rod heater 13 is not absorbed, the filter 1 is deformed. Therefore, in this exhaust gas purifying apparatus, the rod heater 13 constituting the outer peripheral heater 7 is provided with threaded end support rods 20 at both ends, and the end support rods 20 are not attached directly to the filter body 2. It is supported by a bracket 19 provided in the housing 10. Specifically, FIG. 1 shows a fixing method for supporting the end support rod 20 on the bracket 19. That is, at least the end of the rod heater 13 is supported by the bracket 19 provided in the housing 10 via the spring member 18 so that the rod heater 13 can be thermally deformed in the axial direction, or the end support rod 20 is mounted on the bracket. The rod-shaped heater 13 is slidably supported in a ring-shaped guide hole 22 provided in the frame 19, and is configured to allow thermal deformation without being restricted in the longitudinal direction with respect to the filter body 2, in other words, the housing 10. Yes. One end of the spring member 18 is fixed to the bracket 19 by a bolt 26 and a nut 21, the other end is inserted into the end support rod 20 of the rod heater 13, and the nut 21 is screwed into the screw of the end support rod 20. It is fixed. Alternatively, the end support rod 20 of the rod-shaped heater 13 is slidably inserted into an insertion hole 22 provided in the bracket 19, and a nut 21 is screwed into the screw at the end of the end support rod 20. . The rod heater 13 may be attached to the bracket 19 at least one end of the rod heater 13, and the other end is fixed by a nut 21 by inserting an end support rod 20 into an insertion hole of the bracket.

  Alternatively, in this exhaust gas purifying apparatus, the outer peripheral heater 7 is a spiral heater 27 formed by extending a metal wire in the longitudinal direction in a spiral shape, as shown in FIGS. Further, the spiral heater 27 in which the metal wire is wound in a spiral shape has a winding number of 27 A dense at both ends 16 along the longitudinal direction of the filter body 2 and a rough 27 B at the central portion 17. . That is, the temperature distribution in the axial direction of the spiral heater 27 is such that the spiral heater 27 can be expanded and contracted in the axial direction, and the pitch of the metal wire is wound up densely 27A at both ends 16 and the central portion 17 is rolled up roughly rough 27B. The intermediate portion 28 between the both end portions 16 and the central portion 17 is made relatively dense 27C, so that the amount of heat generated in the portion corresponding to both end portions of the filter body 2 can be increased and the central portion can be reduced. . Further, since the spiral heater 27 is a kind of helical spring, the extension of the heater 27 itself due to thermal expansion due to energization overheating can be absorbed by the spring structure of the spiral heater 27.

  The frame reinforcing member 35 is incorporated in the filter body 2 in order to reinforce and hold the corrugated shape of the cylindrical body 3 that is bent and formed in a bellows shape. As the frame reinforcing member 35, for example, the one shown in FIGS. 12 to 14 disclosed in Patent Document 4 can be used, which will be briefly described here. The frame reinforcing member 35 includes a plurality of disk members 40 disposed at both ends of the cylinder 3 positioned on the inflow side of the exhaust gas G in the filter housing chamber formed in the housing 10, and a plurality of longitudinal members of the cylinder 31. A ring member 42 having a hollow hole 45 that allows the flow of exhaust gas G disposed at a predetermined location, and a bowl-like frame 44 extending in the longitudinal direction between the disk member 40 and the ring member 42 are provided. . As shown in FIG. 13, the disc member 40 has a protrusion 39 having a shape corresponding to the convex portion 11 of the cylindrical body 3 on the outer periphery, and the ring member 42 has an outer periphery as shown in FIG. A projection 41 having a shape corresponding to the projection 11 of the cylindrical body 3 is provided. In particular, as shown in FIG. 12, the bowl-shaped frame 44 is disposed in a trough 43 between the protrusions 39 and 41 of the disc member 40 and the ring member 42 and extends in the longitudinal direction. The bowl-shaped frame 44 is made of a metal material having a small thermal expansion, such as ferritic stainless steel, in order to reduce at least the amount of thermal expansion in the longitudinal direction. Further, the disk member 40 and the ring member 42 are made of a relatively inexpensive metal material having high high-temperature strength, such as austenitic stainless steel, since it is not necessary to consider the amount of thermal expansion in the longitudinal direction. . The frame reinforcing member 35 is supported inside the cylindrical body 3 by a support member or the like, or supported by the housing 10 by a bracket or the like.

  The exhaust gas purifying apparatus according to the present invention collects particulate matter (PM), which is a harmful substance such as soot, SOF, and sulfate, contained in exhaust gas discharged from large diesel engines such as ships and industrial machines. Therefore, the harmful substances are preferably incinerated to be eliminated and used to purify the exhaust gas.

DESCRIPTION OF SYMBOLS 1 Filter 2 Filter main body 3 Cylindrical body 4 Ceramic nonwoven fabric 5 Wire mesh heater 7 Outer periphery heater 8 Supporting wire mesh 9 Exhaust gas passage 10 Housing 13 Rod heater 14 Heater main body 15 Resistance adjustment plate 16 End portion 17 Central portion 18 Spring member 19 Bracket 22 Ring Guide hole 24 gap 28 intermediate portion 29 spring support member 35 reinforcing member for frame G exhaust gas

Claims (4)

Particulate matter such as soot and SOF contained in the exhaust gas is collected by a filter housed in a housing disposed in an exhaust gas passage for exhausting exhaust gas from a diesel engine, and collected in the filter. In the exhaust gas purifying apparatus for purifying the exhaust gas by incinerating the particulate matter,
The filter is formed by bending a laminated body composed of a wire mesh heater energized during regeneration, a pair of ceramic nonwoven fabric sandwiching the wire mesh heater from both sides, and a pair of supporting wire mesh laminated on the outside of the ceramic nonwoven fabric in a bellows shape. It is composed of a cylindrical body molded into a cylindrical shape,
Includes an outer heater inner peripheral side placed has been framework reinforcing member, and disposed with a gap in the housing on an outer peripheral side of the cylindrical body of the cylindrical body,
At least one end of the cylindrical body constituting the filter is spring-supported by the housing, and the outer peripheral heater disposed on the outer peripheral side of the filter has a calorific value at both ends of the outer peripheral heater at a central portion. It is configured to be larger than the calorific value,
The outer peripheral heater is composed of a plurality of metal rod heaters, and at least one end is elastically supported by the housing by a spring member and extends in the longitudinal direction of the filter, and is restrained in the longitudinal direction with respect to the filter. It is configured to allow thermal deformation without being
The exhaust gas is allowed to flow through the filter, and the particulate matter contained in the exhaust gas is collected by the filter, and the particulate matter collected by the filter during regeneration of the filter is collected by the wire mesh heater and the outer periphery. An exhaust gas purification apparatus for purifying the exhaust gas by heating and incinerating the particulate matter by energizing a heater and burning at a uniform low temperature over the entire area of the filter . The rod heater constituting the outer periphery heater is fitted at least one end through a gap in a ring-shaped guide hole attached to the housing, and the rod heater is not restrained in the longitudinal direction with respect to the housing. 2. The exhaust gas purifying device according to claim 1 , wherein the exhaust heater is configured to allow thermal deformation of the rod heater. The peripheral heater formed of the metallic rod-shaped heater according to claim 1 or 2, characterized in that it is composed of a longitudinally fixed along the resistance adjusting plate of the rod-shaped heater body and said heater body Exhaust gas purification device. The exhaust gas purifying apparatus according to any one of claims 1 to 3 , wherein the filter is configured to be installed in a vertical state with respect to a base on which the filter is installed.

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