CN203685355U

CN203685355U - Automatic heating device for automotive tail gas emission

Info

Publication number: CN203685355U
Application number: CN201320895395.7U
Authority: CN
Inventors: 高志男; 贾贵起
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2014-07-02
Anticipated expiration: 2023-12-31

Abstract

The utility model provides an automatic heating device for automotive tail gas emission, and belongs to the technical field of automotive tail gas pollutant emission reduction. The purpose of heating exhausted tail gas, and enabling a catalyst to be ignited and to be at the best working temperature is achieved. The automatic heating device comprises a heat storage and exchange device and a bypass pipeline, wherein phase-change thermal storage materials (10) are arranged in the heat storage and exchange device which is provided with a vacuum heat insulation layer (31). High-temperature heat in tail gas emission is automatically absorbed in normal running of an automobile and stored in the phase-change thermal storage materials (10), low-temperature tail gas exhausted by the vehicle can be automatically heated, the catalyst is made to be quickly ignited to reach the best working temperature, the best conversion effect is achieved, low-temperature tail gas emission pollution is reduced, emission reduction and environment protection are facilitated, a gas guide and heat exchange pipe (9) comprises an inner stab piece (18) and an outer stab piece (19), and therefore a heat conducting effect is enhanced; the automatic heating device is simple in structure, low in cost, convenient to implement, and capable of being produced in an industrial mode.

Description

A kind of Automatic-heating heat riser for motor vehicle exhaust emission

Technical field

The invention belongs to automobile exhaust pollution thing emission-reduction technology field, relate to a kind of Automatic-heating heat riser for motor vehicle exhaust emission.

Background technique

In the pollution reduction technology of controlling in motor vehicle exhaust emission, diesel engine is mainly controlled motor vehicle exhaust emission pollutant by the control of cylinder fuel, improvement fuel qualities and reprocessing purification technics, first two technology control effect is limited, then treatment and purification technology is to control the best selection of effect, at present generally application have diesel oxidation converter (being called for short a DOC) technology, selective catalytic reduction (being called for short SCR) technology, especially SCR technology or DOC+XCR technology are at present the most frequently used; Diesel-oil vehicle is the meagre burning of oxygen enrichment, and in tail gas, the volume parts of oxygen can reach more than 10%, and therefore the content of HC and CO is very low, and NO ₂content higher, optionally reductive NO of available a small amount of HC _xreach and remove HC and NO simultaneously _xdOC technology can reach respectively 90% and 70% to the transformation efficiency of CO and HC, and can alleviate the stink of diesel exhaust gas, simultaneously, its eliminating rate to dissolved organic matter (SOF) component in a material thing can be up to 90%, thereby can make the removal efficiency of total PM reach 15%-30%; SCR technology is the technology of comparative maturity, to NO _xconversion ratio quite high, can remove most NO _x, reducing agent is selected proper in NO _xconversion ratio can reach 90%, NO _xbeing one of factor of PM2.5 formation, is also the major pollutants that acid rain forms, and SCR technology also can reduce the discharge amount of part HC simultaneously.Operating temperature has larger impact to the transformation efficiency of catalyzer, for DOC technology, it is operated in oxidizing gas atmosphere, when temperature is during lower than 150 DEG C, catalyzer is substantially inoperative, its optimum working temperature is 200～400 DEG C, and for SCR technology, optimum working temperature is 300～400 DEG C.

Petrol engine reprocessing purification technics generally adopts triple-effect catalytic unit (TWC), and it is operated in reducibility gas atmosphere, and HC and CO, by burning in triple-effect catalytic unit inside, make it be converted into water and CO ₂; The temperature that TWC starts to work is 200 DEG C of left and right, when temperature is during higher than initiation temperature, catalyst converter reaches optimum Working, has the highest conversion ratio, initiation temperature is corresponding temperature while reaching 50% according to conversion ratio, and TWC optimum working temperature need reach 400 DEG C.

No matter be diesel-oil vehicle or gasoline car, it is to all using catalytic conversion technique in the post-processing technology of tail gas discharging pollutant, and all need certain temperature, just can reach optimum working state, and optimum working temperature is all more than 250 DEG C, but automobile is in the time of cold start-up, and exhaust emissions temperature is low, catalyst temperature is difficult to comparatively fast reach initiation temperature, does not have catalysis; The temperature that cold-starting automobile refers to automobile engine body in or lower than the startup under normal temperature state, automobile is in the time of cold start-up, especially severe winter, originally with regard to Yin Wendu lowly, unfavorable light, high, the combustion instability of residual gas concentration in cylinder, easily fire extinguishing again, while having data to show that the discharge of the average HC of petrol engine cold start-up is hot idling 8～13 times, therefore, HC, CO and NO in exhaust emissions _xcontent is high, and a large amount of harmful substances directly enter atmosphere, can cause severe contamination, and therefore, cold starting process catalyzer is rapidly heated and reaches operating temperature, is to reduce discharging the problem in the urgent need to address facing; Published scheme has, and catalytic converter is approached to engine arrangement as far as possible, but this needs catalyzer to have very high heat durability, is also difficult at present to solve; Adopt high void density thin-wall carrier (pottery and metal), improve catalyzer early activity, reduce the initiation temperature of catalyst converter, this tends to cause very high temperature, have the danger of the catalysis of making inefficacy, require catalyzer must have high thermostability, this is also insoluble; Adopt the catalytic converter of hot type, utilize electric heating or the heating of combustion hydrogen, complex process, and be unfavorable for safety, lack real feasibility.

Described cold-starting automobile typically refers to the temperature of automobile engine body in normal temperature or lower than the startup under normal temperature state, in fact, stop the intermittence in automobile normal use, from dozens of minutes by several hours, although the temperature of engine body does not drop to normal temperature sometimes, but when it is restarted, exhaust emissions temperature is very low equally, even in normally travelling, under ubiquitous of short duration parking, idling and small load condition state, exhaust emissions temperature is also lower, is generally less than 250 DEG C (fingering enters the temperature before catalytic converter).Due to the initiation temperature lower than catalyst converter, the changing effect of the lighter's catalyzer is not good, and severe one catalyzer is inoperative, and the pollution emission therefore causing is to exist generally and in a large number, is also problem not to be solved.

Summary of the invention

The technical problem solving:

A kind of Automatic-heating heat riser for motor vehicle exhaust emission is provided, can automatic absorption the heat of high temperature of its exhaust emissions in storage automobile normal running, again can be at cold-starting automobile, intermittently stop and of short duration parking, when idling and small load condition, its exhaust emissions Automatic-heating is heated up, thereby can make catalyst converter ignition as early as possible, and then reach its optimum working temperature, play the transformation to the pollutant maximum in exhaust emissions, receive best changing effect, thereby alleviate the pollution of automobile low temperature exhaust gas discharge, favourable reduction of discharging, environmental protection, simple in structure, cost is low, be convenient to implement, can industrialization produce.

The technological scheme adopting:

A kind of Automatic-heating heat riser for motor vehicle exhaust emission, have and can be connected in automobile exhaust emission system and be positioned at accumulation of heat before catalytic converter hold concurrently heat exchanger and bypass line, it is characterized in that: the hold concurrently concrete structure of heat exchanger of accumulation of heat is, there is the housing with vacuum heat-insulating layer, described housing by main body and the left and right end socket that sealing is welded on the two ends of main body respectively form; On left and right end socket, sealing is welded with the left and right interface of gas respectively, at position, the boundary place at the two ends of left and right end socket and main body, sealing is welded with left and right card respectively, the air guide that between left and right card, sealing the is equipped with regular distribution heat exchanging tube of holding concurrently, in the chamber of main body, each air guide is held concurrently and between heat exchanging tube, is full of for can automatic absorption and store the heat of high temperature of motor vehicle exhaust emission the phase change heat storage material that can heat up to motor vehicle exhaust emission Automatic-heating; On left card, be equipped with the detachable property of bolt connection type sealing cover for installing the charging hole of phase change heat storage material additional, charging hole is positioned at left end socket; The concrete structure of bypass line is, there is straight tube, it is held concurrently the detachable property of heat exchanger by the left and right threeway of "∧" type and accumulation of heat and is connected in parallel, one end of right threeway and straight tube and and accumulation of heat hold concurrently, between the right interface of heat exchanger, the linking type temperature control commutation guide valve with temperature detect switch (TDS) be housed, first, second temperature signal point that its commutation air guide is worked simultaneously lays respectively in phase change heat storage material and the left threeway of "∧" type; The hold concurrently concrete structure of heat exchanging tube of described air guide is, on its inwall, there is regular distribution and sting sheet for strengthening in the axial property of conductive force, on its outer wall, have regular distribution for strengthening the outer thorn sheet of conductive force, the air guide heat exchanging tube of holding concurrently is welded on left and right card by the shaven head end on its two ends.

Beneficial effect:

A kind of Automatic-heating heat riser for motor vehicle exhaust emission, owing to thering is the accumulation of heat heat exchanger of holding concurrently, can be automatically by the air guide heat conduction of the heat exchanging tube heat of high temperature in exhaust emissions while absorbing automobile normal running of holding concurrently, and be stored in the phase change heat storage material in regenerative heat exchanger, and when certain limit is arrived in phase change heat storage material temperature rise, can make high-temperature tail gas discharge automatically drain and directly enter catalytic converter by bypass line by the temperature control guide valve that commutates, in the time that phase change heat storage material temperature is reduced to certain limit, temperature control commutation guide valve counteragent, again automatically absorb heat of high temperature being stored in phase change heat storage material by the air guide heat exchanging tube of holding concurrently, so repeatedly, work as cold-starting automobile, especially intermittently stop and ubiquitous of short duration parking, idling and small load condition state under in the time that low temperature exhaust gas discharges, the heat of high temperature of storing in phase change heat storage material can be automatically outwards dispersed by the air guide heat exchanging tube of holding concurrently, in order to improve the temperature of exhaust emissions, thereby can make catalyst converter reach as early as possible initiation temperature, and then reach its optimum working temperature, after cold-starting automobile, proceed to normally and travel, phase change heat storage material can transfer again the heat of high temperature absorbing in the discharge of gas tail gas automatically to, so repeatedly, because the accumulation of heat heat exchanger of holding concurrently has vacuum heat-insulating layer structure, therefore, the heat of high temperature of storing in phase change heat storage material can not be scattered and disappeared within a period of time, and can meet cold-starting automobile, especially the intermittently needs under parking and ubiquitous of short duration parking, idling and small load condition state, be used for improving exhaust emissions temperature, to reach as early as possible the initiation temperature of catalyst converter, and then reach optimum working temperature, play the transformation to the pollutant maximum in low temperature exhaust gas discharge, receive best changing effect, because the air guide heat exchanging tube of holding concurrently has inside and outside perverse of conductive force of enhancing, therefore, phase change heat storage material storage and release heat of high temperature are fast, are applicable to motor vehicle exhaust emission, and interior perverse have interception function to the particulate matter in low temperature exhaust gas discharge, after high temperature, can decompose and discharge by automatic combustion again, overall structure is convenient to catalytic converter supporting equipped, is conducive to reduce discharging, environmental protection, simple in structure, cost is low, is convenient to implement, and can industrialization produce.

Brief description of the drawings

Fig. 1, overall structure composition schematic diagram;

Fig. 2, cut open figure by the A-A shown in Fig. 1;

Fig. 3, the air guide overall structure figure of heat exchanging tube 9 that holds concurrently;

Fig. 4, the structural drawing of interior perverse 18, (a) integrated straight lines banding pattern, (b) integrated straight lines grooved, (c) overall straight line petal bar grooved.

Fig. 5, the structural drawing of outer perverse 19, (d) strip-type, (e) stick type, (f) one-piece auger strip-type, (g) pressure cap type;

Fig. 6, press the structural drawing of the amplification I vacuum heat-insulating layer 31 shown in Fig. 2.

Embodiment

Further explanation in detail by reference to the accompanying drawings;

As shown in Fig. 1～6, a kind of Automatic-heating heat riser for motor vehicle exhaust emission, have and can be connected in automobile exhaust emission system and be positioned at accumulation of heat before catalytic converter hold concurrently heat exchanger and bypass line, the hold concurrently concrete structure of heat exchanger of accumulation of heat is, there is the housing 1 with vacuum heat-insulating layer, described housing 1 by main body 2 and the left and right end socket 3,4 that sealing is welded on the two ends of main body 2 respectively form; On left and right end socket 3,4, sealing is welded with the left and right interface 5,6 of gas respectively, at position, the boundary place at the two ends of left and right end socket 3,4 and main body 2, sealing is welded with left and right card (tube sheet) 7,8 respectively, the air guide that between left and right card 7,8, sealing the is equipped with regular distribution heat exchanging tube 9 of holding concurrently, in the chamber of main body 2, each air guide is held concurrently and between heat exchanging tube 9, is full of for automatic absorption and stores the heat of high temperature of motor vehicle exhaust emission, and the phase change heat storage material 10 that can heat up to motor vehicle exhaust emission Automatic-heating; On left card 7, be equipped with the detachable property of bolt connection type sealing cover 11 in order to install the charging hole 12 of phase change heat storage material 10 additional, charging hole 12 is positioned at left end socket 3; The concrete structure of bypass line is, there is straight tube 13, it is held concurrently the detachable property of heat exchanger by the left and right threeway 14,15 of "∧" type and accumulation of heat and is connected in parallel, one end of right threeway 15 and straight tube 13 and and accumulation of heat hold concurrently, between the right interface 6 of heat exchanger, the linking type temperature control commutation guide valve 16 with temperature detect switch (TDS) be housed, first, second

temperature signal point

17,37 that its commutation air guide is worked simultaneously lays respectively at phase change heat storage material 10 and the left threeway 1 of "∧" type

in, the hold concurrently concrete structure of heat exchanging tube 9 of described air guide is, on its inwall, there is regular distribution for strengthening in the axial property of conductive force perverse 18, on its outer wall, have regular distribution for strengthening outer perverse 19 of conductive force, the air guide heat exchanging tube 9 of holding concurrently is welded on left and right card 7,8 by the shaven head end 20 on its two ends; Suitable of the length S of shaven head end 20 and the thickness of left and right card 7,8.

In perverse 18 extend in the hold concurrently radial equipartition, axial integral of heat exchanging tube 9 of air guide, interior perverse 18 footpath of holding concurrently on the inwall of heat exchanging tube 9 in air guide inwardly prolonged highly equal, and the diameter that the border line of interior perverse 18 can form taking O-O axis as axle is Φ ₁virtual axial bore 21; Outer perverse 19 in air guide hold concurrently the radial equipartition of heat exchanging tube 9, axially uniform or axial integral extends, outer perverse 19 radially extension height of holding concurrently on the outer wall of heat exchanging tube 9 in air guide equates, and the diameter that the border line of outer perverse 19 can form taking O-O axis as axle is Φ ₂imaginary axis to external cylindrical surface 22.

As shown in Figure 4, in figure, dotted line is shown the hold concurrently inwall of heat exchanging tube 9 of air guide, the structure of interior perverse 18 is as shown in (a), for integrated straight lines band 23 types or double 3～8, uniform mesh 25 type of being with of integrated straight lines band 23, or as shown in (b), for integrated straight lines groove 24 types or double 3～8, uniform mesh 25 type of being with of overall bar groove 24, or as shown in (c), for integrated straight lines groove petal 38 types or integrated straight lines groove petal 38 is double is with uniform mesh 25 types, its integrated straight lines groove petal 38 processes for entirety;

As shown in Figure 5, in figure, dotted line is shown the hold concurrently outer wall of heat exchanging tube 9 of air guide, the structure of outer perverse 19 is as shown in (d), for 3～8, integrated straight lines band 23 type, or as shown in (e), for many sticks 26 types of rule laying, or as shown in (f), for 3～8, one-piece auger band 27 type, or as shown in (g), for multiple pressure cap 28 types, pressure cap 28 is by shade 29, cap neck 30 processes through entirety, pressure cap 28 one by one supporting or cover is pressed in air guide and holds concurrently on the outer wall of heat exchanging tube 9, or pressure cap 28 is one by one after casing pressure, the air guide heat exchanging tube 9 of holding concurrently is imposed to tube, thereby making pressure cap 28 all be fastened on air guide holds concurrently on the outer wall of heat exchanging tube 9.

As shown in Figure 6, the total thickness of the vacuum heat-insulating layer 31 of housing 1 is m, wherein the thickness of thermal-protective coating 32 is n, n must be less than m, thermal-protective coating 32 is multi-layer structure, and from inner outside, layers of insulating fabric (or heat insulation enamelled coating) is arranged with aluminium foil layer interval, the outermost surface that should ensure thermal-protective coating 32 is aluminium foil layer, between the outer side wall of itself and vacuum heat-insulating layer 31, should leave sufficient spacing (m-n).

As shown in Figure 1, electric heater 33 with temperature detect switch (TDS) is also housed in the phase change heat storage material 10 in housing 1, its temperature signal point is the first temperature signal point 17, its power line fairlead 34 sealings are taken over 36 through the neck of right card 8 and right interface 6 and are drawn external interface 35, this interface external 220V civil power of energy or alternator, the power of electric heater 33 is 1000～3000W; When long-time parking, or severe winter, it is few that phase change heat storage material 10 stores heat, and temperature is low, while being difficult for recovering again, starting electric heater 33 it is given to additional heat, proceeds to as early as possible normal state.

Corresponding size specification is selected as follows:

Length 700～the 1200mm of main body 2, internal diameter 200～350mm, wall thickness 2～3.5mm, the total thickness m of vacuum heat-insulating layer 31 is 15～35mm, the thickness 8～20mm of thermal-protective coating 32;

Thickness 5～the 10mm of left and right card 7,8;

Left and right end socket 3,4 is ellipse end socket;

The air guide external diameter 10～20mm of heat exchanging tube 9 that holds concurrently, wall thickness 0.8～2mm;

In perverse 18 be 3～8, or entirety processes, thickness 0.3～0.5mm, the diameter of phi of virtual axial bore 21 ₁be 3～10mm;

Thickness 0.4～the 1.0mm of outer perverse 19, imaginary axis is to the diameter of phi of external cylindrical surface 22 ₂be 15～30mm;

Temperature control commutation guide valve 16 is purchased from the permanent shield auto part making plant in Shiyan City of Hubei Province.

Phase change heat storage material 10 is purchased from Himin Solar Energy (Shanghai) Co., Ltd., can be according to needing production;

Be applicable to the kind of diesel car, select 450 ± 10 DEG C of phase transition temperatures, allow 800 ± 50 DEG C of the highest temperatures, latent heat of phase change value >=600kj/kg, density 2.5～3.0, thermal conductivity >=1.2w/m DEG C, operating life >=4000 time, decay ≯ 12%; Corrosion-free to steel, stainless steel;

Be applicable to the kind of automobile, select 550 ± 10 DEG C of phase transition temperatures, allow 1000 ± 50 DEG C of the highest temperatures, latent heat of phase change value >=600kj/kg, density 2.5～3.0, thermal conductivity >=1.2w/m DEG C, operating life >=4000 time, decay ≯ 12%; Corrosion-free to steel, stainless steel;

Described to temperature control commutation guide valve 16 first, second

temperature signal point

17,37 that air guide works that commutates simultaneously, refer to, while only having the temperature gathering when first, second

temperature signal point

17,37 to reach the limiting temperature value of setting separately simultaneously, corresponding temperature detect switch (TDS) could move, and control the 16 interlock commutation air guides of temperature control commutation guide valve, make exhaust emissions hold concurrently and commutate and pass through between heat exchanger main road in bypass line and accumulation of heat; The limiting temperature that the first temperature signal point 17 sets is also the limiting temperature of the temperature detect switch (TDS) of electric heater 33 simultaneously, and while reaching this temperature, electric heater 33 stops heating; Conventionally choosing is that the first temperature signal is put 17 limiting temperature >=600 DEG C, the second temperature signal is put 37 limiting temperature >=530 DEG C, in the time that two signaling points reach institute's limiting temperature simultaneously, an exhaust emissions by-passing pipeline, when two signaling points all lower than or when wherein any signaling point is lower than limiting temperature, exhaust emissions is only walked the accumulation of heat heat exchanger main road of holding concurrently.

In the application, except specified otherwise, each parts are stainless steel, and connect and be welding each other;

The required total amount of phase change heat storage material 10 depends on the specification of vehicle, exhaust emissions amount, catalytic converter type and phase change heat storage material 10;

Fully meeting under the speed of exhaust emissions, the interior perverse 18 total heat diffusion area forming strengthens as far as possible;

Fully meeting under the reserves of phase change heat storage material 10, the outer perverse 19 total heat diffusion area forming strengthens as far as possible;

Between left and right card 7,8 air guide of regular distribution hold concurrently beyond the arranging of heat exchanging tube 9 perverse 19 each other and and the inwall of main body 2 between do not collide and do not disturb as principle;

According to the type selecting general arrangement installation dimension of different automobile types and catalyst converter.

Claims

1. the Automatic-heating heat riser for motor vehicle exhaust emission, have and can be connected in automobile exhaust emission system and be positioned at accumulation of heat before catalytic converter hold concurrently heat exchanger and bypass line, it is characterized in that: the hold concurrently concrete structure of heat exchanger of accumulation of heat is, there is the housing with vacuum heat-insulating layer, described housing by main body and the left and right end socket that sealing is welded on the two ends of main body respectively form; On left and right end socket, sealing is welded with the left and right interface of gas respectively, at position, the boundary place at the two ends of left and right end socket and main body, sealing is welded with left and right card respectively, the air guide that between left and right card, sealing the is equipped with regular distribution heat exchanging tube of holding concurrently, in the chamber of main body, each air guide is held concurrently and between heat exchanging tube, is full of for can automatic absorption and store the heat of high temperature of motor vehicle exhaust emission the phase change heat storage material that can heat up to motor vehicle exhaust emission Automatic-heating; On left card, be equipped with the detachable property of bolt connection type sealing cover for installing the charging hole of phase change heat storage material additional, charging hole is positioned at left end socket; The concrete structure of bypass line is, there is straight tube, it is held concurrently the detachable property of heat exchanger by the left and right threeway of "∧" type and accumulation of heat and is connected in parallel, one end of right threeway and straight tube and and accumulation of heat hold concurrently, between the right interface of heat exchanger, the linking type temperature control commutation guide valve with temperature detect switch (TDS) be housed, first, second temperature signal point that its commutation air guide is worked simultaneously lays respectively in phase change heat storage material and the left threeway of "∧" type; The hold concurrently concrete structure of heat exchanging tube of described air guide is, on its inwall, there is regular distribution and sting sheet for strengthening in the axial property of conductive force, on its outer wall, have regular distribution for strengthening the outer thorn sheet of conductive force, the air guide heat exchanging tube of holding concurrently is welded on left and right card by the shaven head end on its two ends.

2. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 1, it is characterized in that: extend in the hold concurrently radial equipartition, axial integral of heat exchanging tube (9) of air guide interior perverse (18), in perverse (18) footpath of holding concurrently on the inwall of heat exchanging tube (9) in air guide inwardly prolong highly equally, and the diameter that the border line of interior perverse (18) can form taking O-O axis as axle is Φ ₁virtual axial bore (21); Outer perverse (19) in air guide hold concurrently the radial equipartition of heat exchanging tube (9), axially uniform or axial integral extends, the radially extension height that hold concurrently on the outer wall of heat exchanging tube (9) in air guide outer perverse (19) equates, and the diameter that the border line of outer perverse (19) can form taking O-O axis as axle is Φ ₂imaginary axis to external cylindrical surface (22).

3. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 1 and 2, it is characterized in that: the structure of interior perverse (18) is double 3～8, uniform mesh (25) type of being with of integrated straight lines band (23) type or integrated straight lines band (23), or be integrated straight lines groove (24) type or double 3～8, uniform mesh (25) type of being with of overall bar groove (24), or be integrated straight lines groove petal (38) type or double uniform mesh (25) type of being with of integrated straight lines groove petal (38), its integrated straight lines groove petal (38) processes for entirety,

The structure of outer perverse (19) is 3～8, integrated straight lines band (23) type, or be many sticks (26) type that rule is laid, or be 3～8, one-piece auger band (27) type, or be multiple pressure caps (28) types, pressure cap (28) is processed through entirety by shade (29) cap neck (30), pressure cap (28) one by one supporting or cover is pressed in air guide and holds concurrently on the outer wall of heat exchanging tube (9), or pressure cap (28) is one by one after casing pressure, the air guide heat exchanging tube (9) of holding concurrently is imposed to tube, thereby making pressure cap (28) all be fastened on air guide holds concurrently on the outer wall of heat exchanging tube (9).

4. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 1 and 2, it is characterized in that: thermal-protective coating (32) is multi-layer structure, from inner outside, layers of insulating fabric (or heat insulation enamelled coating) is arranged with aluminium foil layer interval, the outermost surface that should ensure thermal-protective coating (32) is aluminium foil layer, between the outer side wall of itself and vacuum heat-insulating layer (31), should leave sufficient spacing.

5. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 3, it is characterized in that: thermal-protective coating (32) is multi-layer structure, from inner outside, layers of insulating fabric (or heat insulation enamelled coating) is arranged with aluminium foil layer interval, the outermost surface that should ensure thermal-protective coating (32) is aluminium foil layer, between the outer side wall of itself and vacuum heat-insulating layer (31), should leave sufficient spacing.

6. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 1 and 2, it is characterized in that: in the phase change heat storage material (10) in housing (1), the electric heater (33) with temperature detect switch (TDS) is also housed, its temperature signal point is the first temperature signal point (17), and its power line fairlead (34) sealing is taken over (36) through the neck of right card (8) and right interface (6) and drawn external interface (35).

7. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 3, it is characterized in that: in the phase change heat storage material (10) in housing (1), the electric heater (33) with temperature detect switch (TDS) is also housed, its temperature signal point is the first temperature signal point (17), and its power line fairlead (34) sealing is taken over (36) through the neck of right card (8) and right interface (6) and drawn external interface (35).

8. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 4, it is characterized in that: in the phase change heat storage material (10) in housing (1), the electric heater (33) with temperature detect switch (TDS) is also housed, its temperature signal point is the first temperature signal point (17), and its power line fairlead (34) sealing is taken over (36) through the neck of right card (8) and right interface (6) and drawn external interface (35).

9. a kind of Automatic-heating heat riser for motor vehicle exhaust emission according to claim 5, it is characterized in that: in the phase change heat storage material (10) in housing (1), the electric heater (33) with temperature detect switch (TDS) is also housed, its temperature signal point is the first temperature signal point (17), and its power line fairlead (34) sealing is taken over (36) through the neck of right card (8) and right interface (6) and drawn external interface (35).