TW500870B - A device and a method for exhaust gas purification and use of the device - Google Patents

Abstract

A device and a method for exhaust gas purification in a combustion engine comprises an arrangement (30) for recirculating exhaust gases from the engine (1) to an air intake (2) thereof. An exhaust gas purification arrangement (31) is adapted to convert constitutes in the exhaust gases to less environmentally hazardous substances. A filter arrangement (32) comprises at least one filter (33) adapted to liberate the exhaust gases from particulate constituents. This filter (33) is adapted to purify EGR-exhaust gases only. According to another aspect of the invention, the filter (33) is arranged in heat transferring relation to at least one converter unit (34) of the exhaust gas purification arrangement so as to receive, from the converter unit, a heat addition to promote regeneration of the filter by combustion of particulate constituents deposited therein.

Description

< Description of the Field of Invention and Conventional Technology>〉: The field of invention is related to-a device for purifying lice from a combustion engine, wherein the combustion engine is based on a claim specific to i from μ λ β利 Ιε * Seeking signs of injury for the 4th party. In addition, the present invention relates to the use of a device for purifying exhaust gas in the engine for purifying exhaust gas, especially in the pre-waste recycling of diesel fuel)-a considerable part and method for purifying harmful exhaust gas, in particular, it refers to Exhaust gas of nitrogen oxides (NOx). In egr. A part of the exhaust gas from the engine is recirculated to an air inlet. It is known to use an exhaust gas purification device containing at least one converter unit, so that the gas component becomes a harmful substance with less harm to the environment. According to the practice, the converter unit generally contains a catalyst to convert the components in the exhaust gas into the lamp catalyst to become a harmful substance with less harm to the environment. Therefore, through this catalyst, carbon monoxide and carbohydrates can be converted into carbon dioxide or water. This requires that a certain amount of oxygen be contained in the exhaust gas. For this reason, an oxygen measurement unit is generally used in the exhaust gas flow from the engine, and this unit transmits an output signal. This transmission is based on the operation of the engine being controlled to achieve the required oxygen content.

^ Furthermore, ‘the catalyst can be used to convert nitrogen oxides to neutral nitrogen. Excessive oxygen in the exhaust gas will cause the reduction of nitrogen oxides to stop, and this reduction in oxidation will lead to the adverse effect of the conversion of other components in the exhaust gas. However, the adjustment of an optimum fuel system will result in the reduction of the above-mentioned harmful components. By using EGR technology, nitrogen oxide reduction can be achieved even further.

Page 5 500870 Case No. 88122245 V. Description of the invention (2) A quantity of fine particles. In the framework of representing the composition of microparticles, the particles it contains, such as ashes, organic residues (called SOF), are generated from fuel or oil. It is known to use simple different types of filters to separate the exhaust gas from the particulate components and release the exhaust gas. This filter is known to be reused, that is, it can be stored again without having to exchange it. This regeneration function is achieved by a conventional technique. The method is to heat the filter to a required level to cause the combustion of particulate components. The energy required for this combustion is very large. For some reason, 'according to the conventional technology, the use of a fixed filter is required, which is a static coupling engine' or removed from it, so that the heating element is connected to the electric power network. The required heating may then occur. It is therefore necessary to interrupt the operation. Another technique to achieve filter regeneration in an EGR recirculation duct (see US 5 207 734 and JP 833832 0) uses a catalyst upstream of the filter to provide heat from the catalyst to the filter. However, this leads to a reduction in filter regeneration ', especially when there is little recirculated exhaust gas under certain engine operating conditions. <Summary of the Invention> The object of the present invention is to improve the conventional technology to achieve effective filter regeneration and effectively purify NOx, carbon monoxide, hydrocarbons, particles, and the like. The purpose of the present invention is achieved by the features proposed in the first item of the patent application scope. Therefore, 'the design of the present invention is based on the concept of configuring a filter, so that the exhaust gas and heat generated in the conversion result of the converter unit can be converted from The filter unit is moved laterally into the filter, so that the conditions for transferring the filter are actually improved. It must be pointed out that in the EGR system, the recirculated exhaust gas changes depending on the operating conditions of the bow. "Under certain conditions, there is 500870 per unit time. Case No. 88122245 V. Description of the invention (3) Certain amount of exhaust gas By filtering only the exhaust gas that passes through the filter, if necessary, the filter may need to reach this temperature, the required filter is regenerated, and the particulate components are burned to cause certain conditions, which together cause the filtration The energy adjustment of the heating element of the device becomes a temperature at which regeneration occurs.

Device. The amount of heat to be filtered is added to the equivalent, that is, to achieve the required, by having the required horsepower to regenerate the device, which can be satisfied when a small amount of difficult to filter at the temperature of the filter is relatively low. According to the thermal energy of the hair, that is, the inner and outer surface of hazel. In particular, one of the effects or temperature. It is better to increase the heat generation of the power system. If it can be achieved, it is better to use the method and device for processing the application of the present invention in the scope of the patent application and the description below. Refer to the "detailed description of the preferred embodiment" proposed in the present invention. Fig. 1 is an engine installation and gas purification device according to the present invention. In the figure, the symbol 1 indicates the combustion engine. The air is taken out through the air inlet 2, and an air filter 2a may be provided. The air directly enters the combustion chamber of the engine through the intake passage indicated by 3 in the text. It has now been pointed out that the invention is used in engines that operate only in suction, i.e., the movement of pistons in the engine to draw air into the combustion chamber of the engine. However, the present invention can also use a supercharger to enhance the engine, that is, forcing the air to be supplied to the engine. This task can generally be accomplished using a compressor. This compressor can be driven in any way, that is, mechanically through the engine or other appropriate auxiliary equipment.% ′ A t 夂 As shown in Figure 1, through the exhaust gas flow from the engine. because

500870 Case No. 88122245 V. Description of the invention (4) This is to amend this. In this example, the white waste shrinker wheel body 4a is installed to apply-inflatable, 4, which contains-and is provided with a turbine wheel body 4b, and定 # ^ Jiang feeds air into the engine and moves the exhaust gas away from the engine, so that the wheel body 4b, S can be set to the operating system of the full wheel body 4b: the same IS but the body "C when the engine is enhanced Often used Ϊ accept overpressure "'Air can be cooled in air 彳: milk cooling. Exhaust gas present in the engine is carried out in the exhaust pipe 6 (20) and the air outlet 9 enters the surrounding environment. It will be described in the following description. The device contains the equipment indicated by 30 in the figure. This equipment is used to bring the engine out of port 2. For this purpose, there is a recirculation duct introduced at 10m: loam to empty milk ^ expressed at 10. This transmission is connected to the air inlet channel indicated by 3 纟. If necessary, U) may cool the recirculated exhaust gas through a cooler U '. = Duct U) can be connected to the air inlet channel 3+ via an intermediary device 12, which is controlled by an ERG control device 13. The valve device 12 can adjust the relationship between the actual amount of fresh air in the intake passage 3 and the supply amount of recirculated exhaust gas from the recirculation duct 10 via the erg pestle device 13. Therefore, the device 12 adjusts the mixture supplied to the air inlet 2 of the engine. The ERG control device 1 2 of the control valve device 12 is obtained by using an oxygen measuring probe (entering probe) 14, a sensor for measuring the engine speed and a sensor 16 for throttle position. Information related to the actual status of the operation. The ERG control device 13 is programmed to control the valve device 12, and therefore the combustion / exhaust gas relationship, so that the quantity of harmful substances leaving the exhaust gas outlet 9 is minimized and discharged into free air. The stylization of ERG control equipment 1 3 is the first page 8 500870 Case No. 88122245 Amendment

V. Description of the invention (5) A well-known way to achieve a pleasing relationship between the different factors mentioned above. Of course, the valve device 12 includes a separate valve body in the intake passage 3 and the recirculation duct 10, and the valve bodies are respectively controlled by the ERG control device 13. In addition, the valve device 12 also includes a unit, wherein the fluid from the intake passage 3 and the recirculation duct 10 can also be taken from the valve body contained in the valve device to a common output fluid, which flows further. Engine air inlet 2 0 The device according to the present invention further comprises an exhaust gas purification device denoted by 31 in the text, and is suitable for converting the components in the exhaust gas into mildly harmful substances. Moreover, the device includes a filter device indicated by 32 in the figure, so that the exhaust gas is separated from the particulate components to release the exhaust gas. The filter device 32 includes at least one filter 33. The passer 33 is configured in a converter unit 34 in the exhaust gas purification device 31 according to a thermal transfer relationship to receive heat from the converter unit 34 and is deposited on the converter unit 34. The combustion of the particulate components inside it improves the regeneration capacity of the filter. In the first figure, it is shown graphically that the exhaust gas purification device 31 and the filter device 32 are both placed in a common housing 35, and the housing 35 is positioned in the exhaust pipe 6, in the same manner as will be described later The casing has a fluid with the same flow path as the exhaust gas leaving the engine. ′, Figures 2 and 3 show enlarged views of the casing shown in Figure 1, and the components therein. The flow direction of the desired exhaust gas is indicated by an arrow 36 in Fig. 2. Therefore, the exhaust gas from the engine reaches the right side of Figs. I $ —, a filter 33 is provided in the flow path 37, which is suitable for making the engine

500870 said amendment No. 88122245 V. Description of the invention (6) The exhaust gas from 1 is recirculated to the air bow 丨 inlet 2 φ ^ 9 ^ ^ Path 37 contains a pipe fitting 38, which is in this pipe fitting 38. You, oh, this &amp; move. The pipe fitting M shown in the figure is here $ + t 2 = housing 35 in the recirculation duct 10. 1j in the middle system is curved and inclined through S? Fan ^ w in the second flow path 39 9 ... A converter unit 34 is set, and the exhaust gas inflow from the engine is connected to the outside world. $ Μ ^ # / , + Γ 噼 逋 噼 逋 废 waste lice outlet 9 (see Figure 1) =: 5 Ϊ Paths 37, 39 are suitable for receiving, and different waste milks go through the same flow path (arrow 36). In other words, it can be said that the flow paths 37, 39 can be met; a t π π β π ° is arranged laterally in a "垔 璺" manner and is parallel to each other. In the example according to Figs. 2 and 3, An Mengdi »^ ^ 丁丁文 衮 The first and second flow paths 37 and 39 correspond to the mouth portions 40 and 41, so they can face the exhaust gas that arrives. FIG. 4 shows another modified embodiment of the present invention. Arrow 36 indicates how the exhaust from the engine arrives. These exhaust gases first flow through the second flow path 39 ,. A part of the exhaust gas that has passed through the converter unit 34, then moves to the first flow path 37, according to the arrow 42. The main part of the exhaust gas flows toward the exhaust gas outlet 9 in a direction indicated by an arrow 43. As shown in the previous example, the air intake channel 3, the pipe member 38, and the recirculation duct 10 are coupled according to the first figure. In short, the converter unit 34 has flowed through the same flow path. In the modified embodiment of Fig. 4, the entire exhaust gas flows through, and then a part of the exhaust gas passes through the filter 33. As in the embodiment of Figs. 2 to 4, at least a part of the filter 33 is surrounded by the converter element 34. In particular, in this example, the embodiment can make the converter unit 34 have a substantially circular cross section, and the filter 33 is arranged in this ring. In this example, the converter unit 34 has a substantially hollow cylindrical shape, and the filter 33 has a cylindrical shape. Page 10

In the embodiment according to FIG. 4, compared with the embodiments shown in FIGS. 2 and 3, the mouth portion 40 of the first flow path 37 ′ is located in the converter unit 34 in the second flow path 39 ′. Downstream, here, the filter 33 and the converter unit 34 are parallel to each other and form a laterally overlapping configuration, so that the mouth portions 40 and 41 of the flow path are generally located on the same plane. The heating element 44 is adapted to provide thermal energy to the exhaust gas passing through the filter 33. The plus element 44 is only suitable for heating the recirculated exhaust gas entering the engine. Therefore, in the flow path 37, a heating element 44 is disposed upstream of at least one portion of the filter. In particular, it is suitable to appropriately configure the grommet 44 in the mouth 40 of the flow path 37. In the embodiment of FIG. 4, the corresponding phrase is also used, but as from the above description, the heating το member 44 'is positioned at the end of the converter unit 34', where when the total exhaust gas flow is taken into account, Arrow 36 positions this downstream. It is best that the hot element 44 is returned to the engine ’s non-sensing sensor to integrate the conversion catalyst action so that the exhaust gas leads to the amount of this filter 33 and, as for, the operation of the heating element, the air is introduced and recirculated to the nearby unit 34 In the structure, the heat input by the converter in the component is obtained by the converter and the catalyst junction unit.器 3 3。 When the machine 3 3. Local contact with the exhaust gas leads to a reduction in the addition of a certain part. It will have heat transfer. It is indicated that some temperature information related to the flow in the recirculation duct 10 is preferably controlled by the control unit. However, a temperature sensor can also be used. This is due to the fact that it has a catalytic conversion and therefore less harmful substances in the environment. Some heat. It is the heat of the exhaust gas that enters the filter 33, and this reversal relationship. The catalyst is an oxidation catalyst, which starts from page 11 500870

The ability of microparticles to release exhaust gas is lower than that of real filtration to release exhaust gas 1, but it is quite heavy #, its size is about 3 (3 to 40%, depending on the performance of the particulate component ... The catalyst structure is prepared so that a real catalyst material such as #metal is coated on a bottom material suitable for a large area. The shell medium structure can be connected through an appropriate mechanical connection component 45. The contact filter 33 includes a high temperature and Materials with good filtering ability. For example, in the case of ceramic materials, mineral fibers and metal fibers are quite useful. This material needs to tolerate the high temperature that can be induced when regenerating the filter. It is best to use a tube The element 46 separates the filter 33 and the converter unit 34, and the heating element 44 is positioned at one end thereof, and the other end is connected to the pipe 38 via a fixing joint 47. The tubular element 46 may be connected to the surrounding converter unit 34 via the fixing element 47. The filter 33 and the converter unit 34 are interconnected, so that heat transfer between them can be effected through heat conduction and / or radiation. It is only possible to say that the filter 3 3 It performs a dual function. Therefore, the filter material can be provided with a catalyst material, so that the surrounding conversion of the components in the exhaust gas occurs in the filter.

The operation of the embodiment of FIGS. 2 and 3: When the engine 1 is running, the exhaust gas reaches the inside of the casing 35 in the direction shown by the arrow 36. A part of the exhaust gas passes through the converter unit 34, and catalytic conversion is also performed therein, so that the unit can remove a part of the particulate components, and burn these particulate components in the converter unit 34, so that Transfer effect, and has &quot; filter effect, &quot; in the converter unit 34. Another part of the exhaust gas according to arrow 36 reaches the flow path 37

Page 12 500870 Correction %% 8812224B V. Description of the invention (9) The exhaust gas is released by separating the exhaust gas from the particulate components through the filter 33. This part of the exhaust gas flows through the recirculation duct and is recirculated to the air intake port 2 of the engine, so that 'corresponding to the exhaust gas purification equipment 3 1 can produce an egr function, and incidentally produce a good effect. The filter 33 has a high-efficiency filtering function, and can basically remove more than 90% of particulate components from the exhaust gas. These components are deposited on the filter material. The filter material is heated by the heat in the exhaust gas and is burned in the surrounding catalyst material, so that the filter 33 can achieve a better temperature rise effect than other ^ preparations. The filter is regenerated by the combustion of the fine particles deposited therein. If necessary, the temperature of the exhaust gas that reaches the boiler 33 through the heating element 44 through the heating element 44 in the environment can be increased to enhance the combustion effect. By an appropriate temperature measurement, the temperature in the filter 33 can be monitored. In this regard, it should be noted that the regeneration of the filter 33 may be performed continuously or intermittently. The degree of t indicates that it is possible that at least part of the catalyst is provided to the filter 33 ′ so that T can perform the filter transfer at a temperature lower than necessary. However, it is necessary to indicate that the filtering effect of the filter 33 is the most important, and the catalyst effect stated is a secondary effect. The surrounding area is also acceptable. In the embodiment illustrated in FIG. 4, the functions are the same, except that the exhaust gas passing through the converter unit 34 'is the portion that will pass through the filter 33'. f In particular, the above description is not intended to limit the scope of the present invention. The description in the text takes a diesel engine as an example, but it must be pointed out that the present invention can be used in other different types of engines. In addition, it should be noted that when the basic concept of the present invention is proposed, those skilled in the art may realize the filter 33 and the converter unit 34 of the other mode. Therefore, of course, multiple filters can also be provided, and

Page 13 500870 Case No. 88122245 a Amendment 5. Invention description (10) One or more individuals in element 34 do not require the filter / converter unit 34 to be a centralized configuration. According to another design concept of the present invention, it is important to configure the filter 33 and the converter unit 34 in this mutual thermal transfer connection, so the filter 33 can be heated by the converter unit 34. For example, the filter 33 can be designed to surround the converter unit 34 instead of the original design. In addition, under the design concept of the present invention, other changes can be made to the above description, and these changes are all within the scope of the present invention.

Page 14 500870 __Case No. 88122245_ Year Month Revision _ Brief Description of the Drawings <Simplified Description of the Drawings> Please refer to the description of the drawings, especially the description of the embodiment of the invention in the text below. In each figure: The diagram is based on the principle of engine installation with exhaust gas purification; the partial cutaway of Fig. 2 shows the converter unit and filter equipment according to the invention; the perspective view of Fig. 3 shows the longitudinal section of Fig. 2; and The 4 key is similar to FIG. 2 and shows the principle according to another embodiment of the present invention. <Illustration of drawing number> 1 • Engine 2 • Air introduction α 2a Air filter 3 Intake passage 4 Full wheel inflator 4a Compressor wheel body 4b Turbine wheel body 5 Air cooler 6 Exhaust pipe 9 Exhaust gas σ 10 Recirculation Conduit 11 Cooler 12 Valve device 13 • ERG control equipment 14 • Oxygen measurement probe

Page 15 500870 _ Case No. 88122245_ Year, month, day, correction diagram, simple description 15 · Sensor 16 · Sensor 3 0 · Recirculation equipment 3 1 · Exhaust gas purification equipment 3 2 · Filter device 3 3 · Filter 34, 34 '· converter unit 35 · housing 36, 42, 43 · arrow,

37, 37,, 39, 39 '· Flow path 3 8, 3 8' · Pipe 40, 40, 41, 41, · Mouth 44, heating element 4 5, assembly 46, tubular element 47, fixing element

Page 16

Claims (1)

DUU8 / U —— Amendment VI. Patent application scope Bayi ^ I. The device for exhausting the exhaust gas from the combustion engine. The exhaust gas packaged by this device is recirculated to its air inlet (2). She 1 has an exhaust gas purification equipment (31), which is suitable for preparing exhaust gas (3 ^), harmful substances with less harm in these two environments, and a transition device with air disc particles, and the device includes at least one filter (33) In order for the abolition member to expressly indicate whether the original substantial meat gas purification equipment should be changed after the amendment (3 hearts; gas' again, the reactor receives a micro-inspection from the waste combustion deposited in it; Jf? 'According to this, the filter (3 3) and turn dragging cry two: while the direction of the re-effectiveness of the filter state is improved, forming at least part ^ hours ^ yuan (3 4) set the filter in a direction transverse to the exhaust gas flow It is located in a heat transfer relationship of a ^^^ pair; it is characterized by: recirculated to the air bow of the engine 丨 a flow path (37), so that the exhaust gas is suitable to be located in a second flow path == 2 ), And the converter unit (34) is connected to the surroundings 2)), in which the exhaust gas flows from the engine (1) 2. As described in the patent application scope (9) of the engine exhaust gas device, 1 described one for purifying from the combustion 39) to receive from the engine and eight middle Design the first and second flow paths (37, '3. Examine the exhaust gas flow through these flow paths as described in the patent application. Engine exhaust gas device, as described in item 1) Λ Among them, the second flow path (39,) is designed so that a part of the waste oxygen, gas, and milk passes through the flow path at night, and then the exhaust gas flows through the flow path (3 7 ,). ^ One of which is used for purification as described in the scope of patent application No. 丨, 2 or 3. / Ran ^ The exhaust device of the engine, where one of the filter (33) and the converter π (34) at least partially surrounds the other 500870 _ Case No. 88122245_ Date __ Six, the scope of patent applications. 5. A device for purifying exhaust gas from a combustion engine according to item 4 of the scope of the patent application, wherein at least a part of the filter (33) is surrounded by a converter unit (34). 6. A device for purifying exhaust gas from a combustion engine as described in item 5 of the scope of the patent application, wherein at least a part of the converter unit (3 4) has a circular cross section, and the filter (3 3) is configured. Within the ring. 7. A device for purifying exhaust gas from a combustion engine according to item 2 of the scope of patent application, wherein the mouths (40, 41) of the first and second flow paths (37, 39) are arranged. Make it towards the arriving exhaust. 8. A device for purifying exhaust gas from a combustion engine as described in item 3 of the scope of patent application, wherein the mouth (40 ') of the first flow path (37') is positioned in the second flow path (39,) 0 i 9 downstream of the converter unit (34 '). A device for purifying exhaust gas from a combustion engine as described in claim 1, 2, 3, 7 or 8, wherein the heating element (44) It is suitable to provide additional heat energy to the exhaust gas passing through the filter (3 3). 10. The device for purifying exhaust gas from a combustion engine according to item 9 of the scope of the patent application, wherein the heating element (44 ') is adapted to heat only the exhaust gas recirculated in the engine. 1 1. A device for purifying exhaust gas from an i engine as described in item 9 of the scope of the patent application, wherein in the design of the first flow path (37), an i heating element (44) is disposed to the filter ( 33) upstream of at least a part. I ί 1 2. One is used for purification as described in the scope of patent application No. 9, 10 or 11 Page 7 500870 _Case No. 88122245_ Year Month__ VI. Scope of patent application Device for exhaust gas from a combustion engine, where the heating element (44) is an electric heating element. 1 3. A device for purifying exhaust gas from a combustion engine according to item 1, 2, 3, 7 or 8 of the scope of patent application, wherein the converter unit (34) contains a catalyst. 1 4. A device for purifying exhaust gas from a combustion engine according to item 1, 2, 3, 7 or 8 of the scope of the patent application, wherein the filter (3 3) includes a high-temperature-resistant and good filtering ability Filter (3 3). i; 1 5. A device for purifying exhaust gas from a combustion engine according to item 2, 2, 3, 7 or 8 of the scope of the patent application, wherein the first flow path 丨 __ | (37) is arranged in a row At any position upstream or downstream of the converter unit of the gas line | | II; 16. A device for purifying exhaust gas from a combustion engine according to item 1, 2, 3, 7 or 8 of the scope of the patent application, wherein the first flow path | (37) includes a filter (33 ), And the connection is in the exhaust line (6) downstream of the turbocharger (4) in the exhaust stream. 17. A device for purifying exhaust gas from a combustion engine as described in item 1, 2, 3, 7 or 8 of the scope of the patent application, which is used for diesel engines. Page 8