Technical Field
The invention relates to a solid the ammonia uses chu ammonia material ammonia gas automatic replenishment system, applied to motor vehicle tail gas nitrogen oxide catalytic purification technology field.
Background Art
The selective catalytic reduction (SCR) technology processing in tail gas diesel NOx is currently the mainstream technology, can absorb the ammonia desorption releases ammonia reducing agent material is urea aqueous solution of a reducing agent to a technical upgrade. The use of metal chloride with ammonia to form coordination compounds of this characteristic, the ammonia gas is fixed down, use of the metal chloride is mainly alkaline earth metal chloride, strontium chloride, calcium chloride, magnesium chloride, and must be auxiliary additive component. Ammonia synthesis of compound material formed as a vehicle-mounted reducing agent ammonia an ammonia, when in use by heating to achieve desorption release the ammonia gas, the ammonia gas with the metal chloride to adsorb and desorb a is a reversible process.
Based on solid ammonia material development and design of the SSCR system, in the course of using the vehicle-mounted power supply, engine coolant or engine exhaust gas to ammonia is heated and releases ammonia, the ammonia gas through the metering of the injection unit to enter into the exhaust gas, the NOx catalyst under the action of the catalytic purification.
The working process of the SSCR system are as follows, the whole vehicle starting after the heated ammonia, ammonia release to reach the system working pressure, according to the engine the original emission MAP data, through the injection metering unit quantitative will ammonia injection in the exhaust pipe, under the action of the catalytic converter, NOx converted into harmless components.
The present diesel vehicles in the course of using the user the pursuit of larger continuous driving capability, therefore factory to have the fuel tank volume raised to 800 L, while the SCR system of the vehicle reducing agent the continuous driving capability have certain limitations, cannot meet the requirements of long distance driving, hence the need for the vehicle reducing agent ammonia storage material supply of ammonia gas.
CN200880010377.8 (for ammonia storage in and from the storage material to release the ammonia system and used for storing and releasing ammonia) introduced for the ammonia stored in the storage in and from the storage material to release the ammonia system, the storage material can be made by adsorption or absorption of reversibly binding and release ammonia, the system is used for ammonia demand can be changed at any time of progressive ammonia demand process.
CN200780043645.1 (the use of the transmission unit of the in-situ re-saturated storage and conveying ammonia method and apparatus), introduced the method of storing and delivering ammonia and for the implementation of the method of the apparatus, wherein when the 2nd adsorption/absorption material through consumption of depleting the ammonia, in a storage tank at a given temperature than the 2nd with ammonia adsorption/absorption material high vapor pressure of ammonia adsorption/absorption material 1st as a container for the 2nd in the ammonia adsorption/absorption material source of ammonia.
CN201180011202.0 (used for determining the container in solid ammonia storage material saturation method) introduced a method used for determining the container in the saturation of the solid ammonia storage material of the method.
Content of the invention
The purpose of the utility model is to provide a solid the ammonia uses chu ammonia material ammonia gas automatic supply system, it can timely as the main material of the SSCR system an ammonia container consumption of ammonia to provide supply, keeping the system of better working performance, the use of a larger solid ammonia material supply container, the entire vehicle space suitable local flexible arrangement, the use of engine waste heat and heating or the vehicle-mounted power supply electric heating, ammonia material heating desorption releases ammonia after the establishment of a certain pressure P2, pressure P2 is larger than the SSCR system ammonia material the pressure in the container P1, when the pressure value P2>P1 when, the supply of the ammonia gas in the container can automatically supply to the ammonia storage material container.
The technical proposal of the utility model is realized in the way: solid the ammonia uses chu ammonia material ammonia gas automatic supply system, by the use of an the main material container, an ammonia material supply container, DCU reductant metering control unit, engine, SCR catalytic converter, use of an electric heating unit material, one-way valve, the main container stored ammonia material, ammonia can be stored in the material supply container, temperature sensor, pressure sensor, exhaust gas three-way valve, wherein the engine cooling system, characterized in that the engine and the SCR catalytic converter connected in parallel on the exhaust gas line of a use of an the main material container, the main material container with use of an exhaust line in parallel arranged on the pipeline of a DCU reductant metering control unit, the rear end of the main container ammonia material connected in series with a ammonia material supply container, the main material with the use of an ammonia container material supply container connected with the one-way valve is arranged on the pipeline, an ammonia storage material filled in the main container main container stored ammonia material, use of an material supply container is filled with the supply container can be stored in the ammonia material, the main material and the use of an ammonia container material supply container on the container of material are set with use of an electric heating unit, the main material and the use of an ammonia container material supply the top of the container are both arranged with a temperature sensor and a pressure sensor.
The use of an the main material container can be arranged in the SCR catalytic converter on the outlet end of the pipeline, at the same time ammonia material supply container holder with a tail gas outlet, with the use of an SCR catalytic converter between the main material of the container is disposed on the exhaust gas line of a tail gas three-way valve, an ammonia material supply container connected with the engine cooling system.
The use of an the main material container can be arranged in the SCR catalytic converter on the outlet end of the pipeline, at the same time ammonia material supply container holder with a tail gas outlet, with the use of an SCR catalytic converter between the main material of the container is disposed on the exhaust gas line of a tail gas three-way valve, with the use of an SCR catalytic converter between the exhaust pipe of the main material of the container on the road is divided into an exhaust branch with material supply container is connected to the ammonia.
The use of an electric heating unit may be a material of the electric heating wire, ceramic electric heater, PTC heater, the arrangement position of the ammonia can be wrapped in the material of the main container, an ammonia material supply container, or the main material container arranged in ammonia, ammonia material supply the inside of the container.
The positive effects of the utility model is its system principle conception, it is simple to control, by the engine waste heat and heating or the vehicle-mounted power supply electric heating ammonia storage material container is heated, the system arrangement of the whole car is simple, and the heating scheme is simple and convenient and easy, and high reliability. Engine waste heat heating ammonia material, makes full use of the engine fuel to generate energy, and improving the thermal efficiency of the engine, saving fuel consumption, and saving energy. At the same time ammonia material supply container spatial arrangement to be more flexible. The use of differential pressure principle, realizes the automatic supply of the ammonia gas, the control is simplified, the reliability of the system is high; in particular the use of the vehicle stops running, has achieved a sustained automatic supply, time is saved, and the efficiency is improved.
Description of drawings
Figure 1 is the arrangement of the structure chart of the of the present utility model.
Figure 2 is the chart of ammonia of the material supply container connected with an engine cooling system of the present utility model.
Figure 3 is the chart of ammonia material supply container connected with the exhaust gas the exhaust gas pipeline of the present utility model.
Mode of execution
The Figure below to further illustrate the utility model as: as shown in Figure 1-3, solid the ammonia uses chu ammonia material ammonia gas automatic supply system, by the use of an the main material container 1, use of an material supply container 2, DCU reductant metering control unit 3, engine 4, SCR catalytic converter 5, use of an electric heating unit material 6, check valve 7, the main container stored ammonia material 8, supply container can be stored in the ammonia material 9, the temperature sensor 10, pressure sensor 11, the exhaust gas of the three-way valve 12, the engine cooling system 13 a, characterized in that the engine 4 with the SCR catalytic converter 5 connected in parallel on the exhaust gas line of a use of an material of the main container 1, use of an the main material container 1 in parallel with the exhaust pipe arranged on the pipeline of a DCU reductant metering control unit 3, ammonia material of the main container 1 the rear end of the ammonia material connected in series with a supply container 2, ammonia material of the main container 1 with the use of an material supply container 2 connected with the one-way valve is arranged on the pipeline 7, use of an the main material container 1 is filled with the main container stored ammonia material 8, ammonia material supply container 2 is filled with the supply container can be stored in the ammonia material 9, ammonia material the main container 1 and ammonia material supply container 2 on the container are set with use of an electric heating unit material 6, use of an material of the main container 1 and ammonia material supply container 2 is arranged in the top of the temperature sensor 10 and the pressure sensor 11.
The use of an the main material container 1 can be arranged in the SCR catalytic converter 5 on the outlet end of the pipeline, at the same time ammonia material supply container 2 separate open a tail gas outlet, SCR catalytic converter 5 with the use of an the main material container 1 between the exhaust gas line of a exhaust gas is disposed on the three-way valve 12, an ammonia material supply container 2 with an engine cooling system 13 is connected.
The use of an the main material container 1 can be arranged in the SCR catalytic converter 5 on the outlet end of the pipeline, at the same time ammonia material supply container 2 separate open a tail gas outlet, SCR catalytic converter 5 with the use of an the main material container 1 between the exhaust gas line of a exhaust gas is disposed on the three-way valve 12, SCR catalytic converter 5 with the use of an the main material container 1 between the exhaust gas line of the exhaust pipe is divided on a road branch with the use of an material supply container 2 is connected.
The use of an electric heating unit material 6 can be electric heating wire, ceramic electric heater, PTC heater, the arrangement position of the ammonia can be wrapped in the material of the main container 1, use of an material supply container 2, or the arrangement of the main material in an ammonia container 1, use of an material supply container 2 internal.
The main material of the heating unit and an ammonia container 6 using vehicle-mounted power supply to the use of an electric heater the main material container 1 is heated, the heating temperature of the heater use when higher than 50 °C above, use of an the main material container 1 after heating the material in the beginning of the desorption release ammonia gas; heating power 800 W, control the heating temperature in the 200 °C within, through the temperature sensor 10 feedback heating temperature T1, the pressure sensor 11 feedback pressure P1, the pressure in the container P1 so as to control the working pressure of 2 bar, stop heating, when the P1 is less than 2 bar when the, to start the heating.
With the use of an the main material container 1 in the consumption of ammonia, in the stop process of heating by the use of an ammonia meeting again in the material is absorbed, the pressure in the container will drop, when the complete absorption of the will form a vacuum state, the vacuum degree close to -0.1 mpa, at this moment the main material an ammonia container 1 with the use of an material supply container 2 between the container form a greater differential pressure driving force, to facilitate the use of an material supply container 2 of ammonia in the ammonia gas to the main material container 1 in the automatic supply of ammonia gas flowing, storing the ammonia material supply container 2 ammonia in pressure is less than the opening pressure of the one-way valve, automatic supply stop.
By adopting on-vehicle power supply is the use of an material supply container 2 heating, heating power 500 W, the pressure in the container P2 control in 5 bar the left and the right, through the temperature sensor 10 feedback heating temperature T2, the pressure sensor 11 feedback pressure P2, the pressure in the container P2 to control the working pressure of 5 bar, stop heating, when the P2 less than 5 bar when the, to start the heating.
Use of an material supply container 2 with the use of an the main material container 1 through a check valve 7 is connected, the opening pressure of the check valve is set to 1 bar. P1 and P2 a certain pressure difference exists between the 3 Bar, ammonia from the ammonia material supply container 2 to the use of an the main material container 1 on the supplement of the ammonia gas. Use of an material supply container 2 volume V2 design is greater than the use of an the main material container 1, V2: V1=5:1;
When the vehicle is stopped running, the main material an ammonia container 1 and the cooling speed is greater than the use of an material supply container 2, resulting in two pressure within the container is further increased difference, P2>>P1, realizing an ammonia material supply container 2 ammonia in automatic of ammonia to the main material container 1 of the supply.
Use of an the main material container 1 can be a container, may also include a used for vehicle starting and small unit, the start of the small unit volume of 1 L, ammonia supplementary use the same supply container 2. In order to 1 L of the computation of the container, the vacuum degree is - 0.09 Bar when, ammonia gas, the ammonia gas pressure is 1.5 bar, duration 1 h, by measuring container of material absorbing the ammonia in an ammonia 65 g.
The engine cooling system 13 through the connected in parallel or in series with the use of an material supply container 2 is connected, by the engine cooling liquid ammonia material can be stored in the supply container 9 is heated, control the coolant flows through the use of an material supply container 2 of the flow, flow control in the 2 - 10 L/min, the heating temperature is 50 °C -90 °C, through the temperature sensor 10 to monitor the temperature in the container, the pressure sensor 11 monitoring ammonia material supply container 2 in the pressure P2, the control pressure is greater than the 3 bar, ammonia material supply container 2 with the use of an the main material container 1 through a check valve 7 is connected to the, the opening pressure of the one-way valve is set to 1 bar. P1 and P2 a certain pressure difference exists between the, ammonia from the ammonia material supply container 2 to the use of an the main material container 1 on the supplement of the ammonia gas. Use of an material supply container 2 volume V2 design is greater than the use of an the main material container 1, V2: V1=5:1;
Use of an the main material container 1 can be a container, may also include a used for vehicle starting and small unit, the start of the small unit volume is 0.5 - 1.5 L, ammonia supplementary use the same supply container 2.
In order to 1 L of the computation of the container, the vacuum degree is - 0.08 Bar when, ammonia gas, the ammonia gas pressure is 3 bar, duration 1 h, by measuring container of material absorbing the ammonia in the use of an 80 - 120 g of.
The main container stored ammonia material 8 using ammonia magnesium chloride, ammonia can be stored in the material supply container 9 using ammonia calcium chloride material.
Automatic supply system of ammonia of ammonia storage material for solid ammonia
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