Technical Field
The utility model relates to a container for the SSCR of the electric heating device, the device is applied to the material of the solid reducing agent for selective catalytic reduction of the SCR exhaust gas after-treatment system, to achieve the effective reducing nitrogen oxides NOx, to meet the requirements of the whole vehicle emissions standards.
Background Art
In diesel and diesel engine emission regulations of the escalation of the background, the SCR technology of vehicles with the whole machine to gradually increase the number. Solid forms of vehicle-mounted ammonia material has been further application, based on the form of a solid reducing agent material of the SCR system (hereinafter referred to as the SSCR system), has already begun on the overall match application.
Solid forms of vehicle-mounted source for material in the course of work, the need for heating the material, solid form material reaches a certain temperature to achieve the release of the ammonia. The commonly used material is ammonium salt, urea and ammonia and the metal salt of the complex compound. The compounds of the ammonium salt class as long as ammonium carbamate, ammonium carbonate and ammonium bicarbonate material, material is heated to above the decomposition temperature point, ammonium salt is decomposed to generate ammonia, carbon dioxide and water compound. Thermal decomposition of urea to ammonia synthesis reactions. Ammonia and the metal salt of the complex compound formed during the heating process on comes off the ammonia gas from the center of the particle. The heating temperature of the ammonium salt -100 °C from room temperature, the decomposition temperature of the urea in the 132 °C above, ammonia and metal-salt forming the coordination compound of ammonia desorption temperature from the room temperature -300 °C between.
The present vehicle can be provided on the heating mode there are three main types, one is to utilize the engine exhaust gas is heated, a is the use of the engine coolant is heated, there is also the use of the electric heating mode. According to the actual use environment of the vehicle and the vehicle situation to choose the appropriate heating mode solid ammonia is heated to realize the release of the ammonia gas.
In order to achieve solid-borne material is heated, the material is heated in the way to become the direction of research, Patent CN201410328612.3, in solid ammonia storage system connected in a heat conducting structure on a flexible material to wrap the ammonia saturated material, the flexible material with good thermal conductivity, but to ammonia saturated material wrapped by the process is complicated, and the cost is high.
Patent document 1 (C N201410328612.3), in solid ammonia storage system connected in a heat conducting structure on a flexible material to wrap the ammonia saturated material, the flexible material with good thermal conductivity, but to ammonia saturated material wrapped by the process is complicated, and the cost is high.
Patent document 2 (C N200880010377.8), used for the ammonia stored in the storage in and from the storage material to release the ammonia system and used for storing and release of ammonia introduced a method with a controller of the heat source to realize the ammonia release method. The method for heating the device control requirements are relatively high, system complexity is large, including air flow structure, the heat exchange structure, inconvenient to implement.
Patent document 3 (C N201180014352.7), is used to control the solid gas storage system in the effective heat transfer of the method and device, focused on the heat conducting connection.
Patent document 4 (C N201210220148.7), the residual heat of the exhaust pipe by way of the active use of an [...] after-treatment control unit, with the introduction of the tail gas to solid ammonia material heating mode, this scheme does not convenient replacement and maintenance of the ammonia container, there is a rather large technical problem.
Patent document 5 (C N201420419405.4), a solid ammonia storage device heating device, tail gas or engine-coolant-water heating, ammonia caused by the material container of large volume, heavy weight, complicated structure.
Content of the invention
The purpose of the utility model is to provide a container for the SSCR of the electric heating device, which can effectively improve the heating efficiency, improve heating performance, realize the SSCR system ammonia in the container material can be quickly releases ammonia, in the container as soon as possible to set up the operation of the system to meet the SCR ammonia gas pressure, realize the injection metering of ammonia gas.
The technical proposal of the utility model is realized in the way: SSCR container for the electric heating device, the heating device includes a controller, a pressure sensor, temperature sensor, electric heater, heat conducting fins, electromagnetic valve, ammonia and a connector, characterized in that the electric heater and are arranged vertically in the central position of the ammonia tank interior, thermally conductive fins set on the electric heater, heat conducting fins is disk-shaped, the number of heat conducting fins associated with the length of the [...], 50 - 150 mm is placed a piece of thermally conductive fins, heat conducting fins are evenly distributed on the circular through hole chu anguan surface; the top end of the power cord of the electric heater with the [...] external controller is connected, an ammonia tank internal electric heater arranged chu anguan surface side of the top end of the pressure sensor and the temperature sensor, the pressure sensor and the temperature sensor through the signal line of the controller with the signal receiving end is connected, is connected to the outlet pipeline [...] chu anguan surface ammonia gas, the ammonia gas outlet pipeline chu anguan surface are arranged on the solenoid valve.
The electric heater is cylindrical or conical, are arranged in the ammonia tank of the electric heater are in the number of 1 - 5 which, when the electric heater is a plurality, can be used for the thermally conductive fins.
The heat conducting fins can be by the disk-shaped replacement is a spiral, wave-shaped or mesh-like structure, the heat conducting fins when replacement is a spiral, the overall is a spiral heat conducting fins along electricity to the heater consists of are arranged up and down; the heat conductive fin is replaced when the wave, four wave-shaped heat conducting fins arranged vertically in the ammonia storage tank and connected with the electric heater; the heat conductive fin is replaced when the grid-shaped structure, the heat conducting fins inside of the ammonia tank is divided into equal parts and a small, central portion of the heat conducting fins connected with the electric heater; thermally conductive fins has a thickness of 0.5 mm - 1.0 mm, heat conducting fins is less than the diameter of the most outer edge [...] diameter 2 - 3 mm.
The positive effects of the utility model is improved and the heater with the use of an the contact area of the material, using fin or grid-shaped heater, can realize even more heat, the fins can be used as the heat conducting material of high heat conductivity material, such as aluminum alloy or other material; employing an external coated electric heater, in order to 12 liter container for example, diameter 200 mm, heating to the needs of the state, need time 20 min - 40 min. The internal electric heating mode the heating time can be 30% or more, the realization of the ammonia gas in the container pressure to meet the requirements of the work of the SSCR system; the use of electric heating scheme system of simple structure, the structure of the entire car change is relatively small. Only required to provide the appropriate heating power supply. Arrangement of the whole car is more convenient, for the future to meet the country six, for exhaust back pressure with relatively high requirements of the vehicle design is easy to achieve.
Description of drawings
Figure 1 is the chart of the of the present utility model.
Figure 2 is the partial chart of heat conduction of the fins of the present utility model.
Figure 3 is the conical chart of an electric heater of the present utility model.
Figure 4 is the [...] heating bar chart of of of the present utility model.
Figure 5 is the spiral structure chart of heat conduction of the fins of the present utility model.
Figure 6 is the wave-shaped heat conductive fin chart of of of the present utility model.
Figure 7 is the heat conducting fin grid chart of of of the present utility model.
Mode of execution
The Figure below to further illustrate the utility model as: as shown in Figure 1-7, SSCR container for the electric heating device, the heating device comprises a controller 1, the pressure sensor 2, temperature sensor 3, the electric heater 4, the heat conducting fin 5, solenoid valve 6, the ammonia gas air outlet pipeline 7 composition, characterized in that the electric heater 4 and are arranged vertically in the central position of the ammonia tank interior, thermally conductive fins 5 is sleeved on the electric heater 4 on, the heat conducting fin 5 is disk-shaped, the heat conducting fin 5 with the length of the number of related [...], 50 - 150 mm is placed a piece of heat conducting fin 5, thermally conductive fins 5 are evenly distributed on the circular through hole chu anguan surface 5 - 1; electric heater 4 at the top end of the power cord and the [...] external controller 1 is connected, an ammonia tank internal electric heater 4 arranged chu anguan surface side of the top end of the pressure sensor 2 and temperature sensor 3, the pressure sensor 2 and temperature sensor 3 through the signal line and the controller 1 is connected to the receiving end of the signal, is connected to the ammonia [...] chu anguan surface air outlet pipeline 7, ammonia air outlet pipeline 7 chu anguan surface are arranged on the solenoid valve 6.
The electric heater 4 is cylindrical or conical, are arranged in the use of an electric heater in the tank 4 is the number of 1 - 5 root, electric heater 4 when for a plurality, can be used for the heat conducting fin 5.
The heat conducting fin 5 by the disk-shaped replacement is a spiral, wave-shaped or mesh-like structure, the heat conducting fin 5 when replacement is a spiral, the spiral of the whole body of the heat conducting fin 5 along electricity heater 4 arranged from top to bottom; the heat conducting fin 5 when replacement is wave-shaped, four wave-shaped heat conducting fin 5 are arranged vertically in the ammonia storage tank and with the electric heater 4 is connected; the heat conducting fin 5 is replaced with a grid-shaped structure, the heat conducting fin 5 will be ammonia tank interior is divided into equal parts and a small, thermally conductive fins 5 with the central portion of the electric heater 4 is connected; thermally conductive fins has a thickness of 0.5 mm - 1.0 mm, the heat conductive fin is smaller than the diameter of the diameter of the most outer edge [...] 2 - 3 mm.
An ammonia storage material container adopts the corrosion-resistant stainless steel or aluminum alloy material preparation, container diameter of 150 mm - 350 mm, length 350 mm - 800 mm, stainless steel rod-type electric heater (electric heating rod) 4 diameter 10 mm - 25 mm, the electric heating rod is fixed on the center line of the container, with the same length and the length of the container, without power line inserted into the one end of the positioning device in the bottom of the container, the heating rod and the other end of the screw thread is connected to container, to ensure that the sealing performance is no ammonia leakage. Electric heating stick is embedded with the chip temperature sensor 3, the power cord and the temperature sensor wire is connected to the controller 1, the controller control an electric heating rod heating function, and according to the temperature measured by the sensor 3 of the temperature value and the pressure in the container sensor 2 monitoring the ammonia pressure value, control of the electric heating work and stop, as shown in Figure 1.
In order to further improve the heating efficiency, the columnar heating rod from top to bottom can be equidistantly installed with heat conducting fin 5, heat conducting fins matching with the diameter of the diameter of the container, the container diameter smaller than the diameter of 2 - 3 mm, in order to facilitate the mounting and fixing, can be in the heating bars and on the distance between the is provided with a limiting fixing structure. The heat conducting layer filled between the ammonia storage material, when the heater is working in an ammonia heat through the heat conducting material between the transfer, heat conducting with the length of the number of related, 50 - 150 mm is placed a piece of thermally conductive fins. The heat conducting fins of the ammonia gas corrosion resistance to the metal material, the heat conducting layer thickness 0.5 mm - 1.0 mm.
In order to reduce the overall quality and improving the gas adsorption and desorption performance, thermally conductive fins 5 can be perforated and processing, aperture 3 mm - 10 mm between, the hole of the heat conducting fin 5 structure arranged as shown in Figure 2, the heat conductive fin in the number of 1 - 50 between.
The electric heating rod can also be designed into [...], as shown in Figure 3, heat conducting fin for the aperture of the central truncated cone to conform with the diameter of the spacing, the outer diameter of the heat conducting container is matched with the diameter, smaller than the diameter of the diameter of the container 2 - 3 mm, convenient filling and heat conducting material of the mounting.
The electric heating rod can use a, not limited to one, can be used as shown in Figure 4 of the [...] heating bar structure, in the case of the use of [...] heating, can also use the heat conductive fin, at this moment the heat conducting fin has evangelist heat outside the function, also the electric heating rod and reinforcing the role of fixing.
The heat conductive fin may take the form of Figure 5, Figure 6, Figure 7 shown, can be wave-shaped, grid-shaped, can be arranged in parallel with the end face of the container, heating of the material can also be made of the same shape with the heat conducting fins, compared with the electric heating rod has greater heating area. The shape of the heat conducting fins.
A electric heater unit for SSCR container
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