CN1238235A

CN1238235A - Exhaustion pipe for reducing pollution by vacuum temp control and water spraying

Info

Publication number: CN1238235A
Application number: CN 99104291
Authority: CN
Inventors: 张子升
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-09
Filing date: 1999-05-09
Publication date: 1999-12-15

Abstract

An exhaust pipe for engine features that besides the functions of original exhaust pipe, that is, exhausting the tail gas generated by engine to atomsphere, it can oxidize the CO and HC in said tail gas to become CO2 and H2O and suppress the generation of NO2 in tail gas because of such techniques as temp.-controlled spraying water, vacuum heat absorption, electrothermal temp. compensation, and temp.-controlled oxidization.

Description

Exhaustion pipe for reducing pollution by vacuum temp control and water spraying

A kind of exhaustion pipe for reducing pollution by vacuum temp control and water spraying is to have only the tail gas transporting that motor is produced to be discharged on the basis of removing simple function in the atmosphere at traditional outlet pipe; Adopting technical measures such as temperature control water spray, vacuum heat absorption, electric heating benefit temperature, temperature control oxidation reaction, when tail gas is discharged in the Atmospheric processes by the outlet pipe transporting, is CO with the CO in the tail gas, HC oxidation reaction ₂And H ₂O, and suppress NO _xGrowing amount in cylinder has reduced CO in the tail gas, HC, NO _xEffluent concentration.

The formation mechanism of pollutant CO, HC, NOx in the tail gas:

CO is the intermediate product of combustion of hydrocarbon fuel, and CO mainly is under local anoxic or low temperature in the tail gas, because the generation of the partial combustion of hydrocarbon;

CH mainly is a non-complete combustion of fuel casing wall quenching, and the generation of the scavenging process of two stroke engine (motorcycle), two stroke engine is bigger several times than the growing amount of four-stroke (automobile) motor;

NOx is that air is formed by the reaction of oxygen and nitrogen under the high temperature condition of firing chamber, and the exhaust gas temperature that burning produces is high more, and the time that high temperature continues is long more, and the growing amount of NOx is just many more.

During the supply engine rich mixture, NOx reduces and CO, HC increase.

Supply engine is slightly during weak mixture, and CO, HC reduce and NOx increases.

During the supply engine weak mixture, NOx, CO reduce and the HC increase.

As long as motor just has the generation of CO, HC, NOx pollutant in running, produce the how much relevant with emission controls by improving combustion advanced technology degree of concentration with the performance of motor.

If newly dispatch from the factory and still can not allow compliance with emission standards the time with the automobile of (listing), motorcycle emission controls by improving combustion technical measures, just must be at vent systems centre (engine exhaust port is between the baffler) fitting machine external purifying device.

Knot ends at present, adopt both at home and abroad external purification device effect best be the three-way catalytic converter of making catalyzer of precious metal (platinum rhodium rhenium palladium).Noble metal catalyst has high temperature resistant, chemically-resistant effect, purification efficiency advantages of higher.But because this class catalyzer resource is few, cost an arm and a leg, it is very difficult generally using under China's present circumstances.

In addition, it is also comparatively strict to use noble metal catalyst that the engine air-fuel ratio ratio of fuel (air with) is required, and has only air fuel ratio was controlled at 14.7: 1 o'clock, and purifying effect is just best.And guarantee 14.7: 1 air fuel ratio, have only the EFI formula motor that a kind of micro processor device is installed to realize; Can't realize for the motor that uses carburetor-type, therefore also just limit the use on carburetor engine.

China present auto producer 120 families, ten thousand of year output 160-240, wherein car is 450,000, if these 450,000 cars all use EFI formula motor, all the other more remain carburetor engine.

If because of environmental protection requirement need undergo technological transformation these automobile factorys, eliminate the carburetor engine production line, adopt EFI formula engine line, must drop into tens billion of again or the fund that exceeds 100 billion, also need a period of time and build to go into operation.

China has now and is being about 1,200 ten thousand with (listing) automobile, and total value is about 400,000,000,000 yuan, and these automobiles are owing to dispatch from the factory the time limit early, and the emission controls by improving combustion technology is incomplete, is carburetor engine more than 95%, the exhaust emissions concentration severe overweight of most of vehicles.

Calculate by annual normal abandonment rate 15%, these 1,200 ten thousand are still used carburetor engine during this period all scrap 8 years of needs with car, and the quantity of newly-increased automobile does not count as yet.

In sum, in conjunction with the national conditions of Domestic Automotive Industry, in the process of accelerating automobile exhaust pollution improvement, press for a kind of engine components of not changing, do not influence the engine operation performance, cheap, installation method is simple, and usability is reliable, subtracts dirty effective device and comes into operation.

Exhaustion pipe for reducing pollution by vacuum temp control and water spraying of the present invention can be realized above-mentioned usage requirement.

Task of the present invention realizes that by following technical conceive scheme its feature comprises:

1, vacuum temperature control water spray subtracts dirty pipe

2, vacuum temp control oxidation reaction pipe constitutes (Fig. 1); Its feature comprises:

1, vacuum temperature control water spray subtracts the technical characteristics of dirty pipe and is: (Fig. 2)

By outer tube (2-1), interior pipe (2-2), two pipe boxes are fitted together solid welding, take out most air and make vacuum tube;

Be combined into honeycomb heat absorption plate (2-3) solid welding in the vacuum tube of packing into several steel corrugated sheets;

Temperature control thermoswitch (2-5), power switch (2-4), thermistor (2-6), automatically controlled spray water valve (2-7) are connected, and connect power switch and just enter working state this moment.

According to the formation mechanism of NOx noted earlier, the increase of mixed gas humidity can make the growing amount of NOx reduce, and its main cause is because the highest flame temperature has reduced.Test is found can make the cylinder inside temperature descend about 2 ℃ by the water vapour of the every increase by 1% of dry air weight, thereby makes the generation speed that begins of nitrogen oxides reduce 25% approximately.

Reach a conclusion thus: i.e. what of dry air water content humidity, can influence the growing amount of NOx, if the humidity of the air in the control engine intake process that can be artificial just can effectively suppress the growing amount of NOx in cylinder, reach the purpose that subtracts dirt.

The temperature control water spray subtracts dirt:

The temperature controlling point of temperature control thermoswitch (2--5) is 750 ℃, and when the temperature in the tail gas reached this temperature, engine operating condition also was when beginning to produce more NOx.At this moment, energize is pressed in the action of temperature control thermoswitch, and thermistor (2--6) is along with the variation of exhaust temperature height produces size, different control electric currents, control the size of automatically controlled spray water valve valve opening degree, make the operating mode situation that sprays into in-engine cool water quantity and motor synchronous.When exhaust temperature hanged down dried 750 ℃, temperature control thermoswitch (2--5) was cut off the electricity supply, and automatically controlled cold valves (2-7) is also closed simultaneously.

The water injection nozzle that enters motor is installed on vaporizer and the engine suction manifold connecting base, and installation method is promptly convenient simple again, is to bore the very little hole of a diameter on connecting by seat, and water injection nozzle is packed into to fix to get final product; Be installed in this position, do not influence the service behaviour of motor, can utilize the engine running air-entry suction again, the cold mist that sprays into is changed into tiny water droplet enter uniformly within each cylinder.

2, the technical characteristics of vacuum temp control oxidation reaction pipe is: (Fig. 3)

By outer tube (3--1), interior pipe (3--2) is sleeved on solid welding together, takes out most air and make vacuum tube;

With several steel corrugated sheets be combined into honeycomb heat absorption plate (3-3), the solid welding in the vacuum tube of packing into;

At the inside and outside two pipe through holes of a side of vacuum tube processing, welded and installed is mended warm electric heating element (3-5) in the hole in base (3-4), base and two are managed solid weldings and can not be leaked gas.

Temperature control thermoswitch (3-6), motor power switch (3-7), mend warm electric heating element (3-5) and be connected, connect the motor power switch and just enter working state this moment.

The temperature control oxidation reaction:

The temperature control point of the benefit temperature electric heating element of temperature control thermoswitch and associated is minimum to be 200 ℃ (this temperature is also lower than 260 ℃ of the self-ignition points of gasoline), is up to 670 ℃ (this temperature has surpassed 650 ℃ of the spontaneous ignition temperature of CO, CH);

In order to adapt to the needs that exhaust temperature changes, can between 200-670 ℃, establish several temperature control points (as 200-300 ℃ ...), and relative temperature control thermoswitch is set and mends warm electric heating element, when exhaust temperature is lower than 200 ℃, between 200-670 ℃ all are mended warm electric heating element and are heated simultaneously, in the several seconds, just the temperature in the oxidation reaction pipe is raised to more than 650 ℃, when exhaust temperature by low when being raised to more than 300 ℃, control the temperature control thermoswitch of 200 ℃ and 300 ℃ and cut off the electricity supply this moment, the benefit temperature electric heating element of 200 ℃ and 300 ℃ stops to mend temperature (the rest may be inferred by analogy for it), when exhaust temperature was higher than 670 ℃, all benefit temperature electric heating elements all stopped to mend temperature.

Because the insulation effect of vacuum tube, reduced scattering and disappearing of tail gas heat quantity, the honeycomb heat absorption plate can absorb deposit when exhaust temperature is high, emit the temperature regulation effect of mending temperature and mending warm electric heating element when temperature is low, make the interior temperature all-the-time stable of oxidation reaction pipe more than 650 ℃, when even if exhaust temperature is lower than below 200 ℃, can be CO still with the CO in the tail gas, HC oxidation reaction ₂And H ₂O.

3, exhaustion pipe for reducing pollution by vacuum temp control and water spraying does not only limit and uses on carburetor engine.

4, vacuum temperature control water spray subtracts dirty pipe, vacuum temp control oxidation reaction pipe, can separate independent use.

5. Figure of description drawing explanation:

Fig. 1:

1-1 vacuum temperature control water spray subtracts dirty pipe 1-2 vacuum temp control oxidation reaction pipe 1-3 motor power switch

1-4 temperature control thermoswitch 1-5 mends warm electric heating element 1-6 temperature control thermoswitch

The automatically controlled spray water valve 1-9 of 1-7 thermistor 1-8 engine exhaust port is taken over

The 1-10 baffler is taken over

Fig. 2:

Pipe 2-3-honeycomb heat absorption plate in the 2-1-outer tube 2-2-

2-4-motor power switch 2-5-temperature control thermoswitch 2-6-thermistor

The automatically controlled spray water valve 2-8-of 2-7-fill hose joint 2-9-titting water outlet

2-10-engine exhaust port connecting tube

Fig. 3:

Pipe 3-3-honeycomb heat absorption plate in the 3-1-outer tube 3-2-

3-4-mends warm electric heating element fitting seat 3-5-and mends warm electric heating element 3-6-temperature control thermoswitch

3-7-motor power switch 3-8-baffler connecting tube

Claims

1, a kind of exhaustion pipe for reducing pollution by vacuum temp control and water spraying is to have only the tail gas transporting that motor is produced to be discharged on the simple function basis of going in the atmosphere at traditional outlet pipe; Adopt temperature control water spray, vacuum heat absorption, electric heating to mend technical measures such as temperature, temperature control oxidation reaction, tail gas be discharged into by the outlet pipe transporting go in the Atmospheric processes in, be CO with the CO in the tail gas, HC oxidation reaction ₂And H ₂O, and suppress NO _xGrowing amount in cylinder has reduced CO in the tail gas, HC, NO _xEffluent concentration.

Its feature comprises:

Vacuum temperature control water spray subtracts dirty pipe,

Vacuum temp control oxidation reaction pipe constitutes;

2, the feature that subtracts dirty pipe according to the described vacuum temperature control of claim 1 water spray is:

By outer tube (2-1), the vacuum tube that interior pipe (2-2) is made;

The honeycomb heat absorption plate (2-3) that is welded in the vacuum tube and can absorbs tail gas heat quantity;

By temperature control thermoswitch (2-5), thermistor (2-6), control the opening and closing of automatically controlled spray water valve (2-7), make the operating mode situation of the cool water quantity that sprays in the cylinder and motor synchronous.

3, the feature according to the described vacuum temp control oxidation reaction pipe of claim 1 is:

By outer tube (3-1), the vacuum tube that interior pipe (3-2) is made;

The honeycomb heat absorption plate (3-3) that is welded in the vacuum tube and can absorbs tail gas heat quantity;

A sidetracking hole and welding are used for installing the base (3-4) of mending warm electric heating element on vacuum tube;

Install on the base and mend warm electric heating element (3-5),, mend warm electric heating element and can be provided with 1 to several according to the difference of engine displacement.

4, according to the described vacuum temperature control water spray exhaustion pipe for reducing pollution of claim 1, only do not limit and on carburetor engine, use.

5, subtract dirty pipe, vacuum temp control oxidation reaction pipe according to the described vacuum temperature control water spray of claim 1, can separate independent use.