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Ammonia gas metering method for solid ammonia storing system

A metering method and ammonia storage technology, which is applied in the field of ammonia gas metering in solid ammonia storage systems, can solve the problems of reduced adsorption capacity, affecting use effects, low adsorption and desorption efficiency, etc., and achieves benefits for emission reduction, reliability and The effect of improved accuracy and high practical value

Active Publication Date: 2014-01-29
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] CaCl 2 Adsorbed NH 3 After that, it is closely connected with the surrounding particles to form agglomerates with almost no pores, and the rest of the NH 3 Difficult access to the area, resulting in NH 3 The adsorption capacity is greatly reduced, which hinders the formation of ammonium calcium chloride complex; compared with the loose adsorbent powder, the adsorbent solid block formed by direct mechanical compression has fewer ammonia gas transmission channels, and the adsorption and desorption low efficiency; in addition, CaCl 2 Adsorbed NH 3 After the volume expands, the solid block is easy to pulverize and break, which affects the use effect

Method used

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  • Ammonia gas metering method for solid ammonia storing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare a stainless steel pressure-resistant storage tank with an effective volume of 32L, fill the storage tank with 15kg of solid ammonia storage material, and complete the ammonia filling; complete the connection of the antifreeze conduit and the ammonia gas inlet and outlet, complete the wiring of the ECU and DCU, and purchase commercially available of precision solenoid valves, temperature sensors, pressure sensors and regulator valves, in accordance with figure 1 The layout completes the connection with the storage tank; there is no filter installed before the solenoid valve on the ammonia pipe; then the system is matched with the 8.6L engine stand, in which the antifreeze pipe is connected to the engine cooling circuit to provide a heat source; The reliability test was carried out at the rated engine speed of 2100rpm and the torque of 1200 Nm. After 38 hours, the NOX at the SCR outlet was measured to exceed the standard, and the purification rate was lower than ex...

Embodiment 2

[0028] Adopt the ammonia storage system prepared by embodiment 1, according to figure 1 The layout completes the connection with the storage tank; the solenoid valve on the ammonia pipe is not equipped with a pressure stabilizing valve; and then the system is matched with the 8.6L engine stand, in which the antifreeze pipe is connected to the engine cooling circuit to provide a heat source ;The reliability test was started at the rated engine speed of 2100rpm and the torque of 1200 Nm. Within 1 hour of the test, the pressure reading indicated by the pressure sensor of the system was 550kpa, and the ammonia smell at the outlet of the SCR was obvious, showing that the amount of ammonia escaped was as high as 125ppm ; It is judged that the ammonia gas flow is too large due to the high pressure in the pipeline.

Embodiment 3

[0030] Still adopt the ammonia storage system prepared by embodiment 1, according to figure 1 Complete the connection with the storage tank; install not only the filter but also the pressure stabilizing valve before the solenoid valve on the ammonia delivery pipe; then match the system with the 8.6L engine stand, where the antifreeze pipe is connected to the engine cooling circuit , so as to provide a heat source; the reliability test operation was started at the rated engine speed of 2100rpm and the torque of 1200 Nm. During the test for 150 hours, there was no "stuck" phenomenon of the solenoid valve, and there was no obvious ammonia smell at the outlet of the SCR. The amount of ammonia gas escaped is as high as 3~7ppm; it is judged that the system is normal;

[0031] First of all, it is determined by the display results of the pressure sensor and temperature sensor whether the system has the basic conditions for releasing ammonia. The pressure sensor shows that the internal...

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Abstract

The invention relates to an ammonia gas metering method for a solid ammonia storing system. The method is characterized by including the following steps that 1) a work condition signal of an engine is sent out by an electronic control unit (ECU), a command deceleration control unit (DCU) outputs signals according to system temperature to change the openness of an electromagnetic valve to control ammonia in a solid ammonia storing material to be evenly output; 2) when the DCU acquires analog signal input, the display internal pressure of a pressure sensor is larger than 200kpa, and the display internal temperature of a temperature sensor is larger than 60 DEG C, the 5-electromagnetic valve is opened. The temperature sensor, the pressure sensor, a filter, a stabilizing valve and an electromagnetic valve are combined in use. The method is applicable to silicon catalytic reduction (SCR) utilized by the national fourth discharging standard and above and also applicable to the future FCEV technology. The ammonia gas metering method is ingenious in idea, simple in process, easy to control, low in cost, safe and reliable, easy to maintain, high in accuracy and the like.

Description

technical field [0001] The invention relates to an ammonia metering method for a solid ammonia storage system, which is applied to an SCR post-treatment system of automobile exhaust and an FCEV fuel cell system. Background technique [0002] At present, the world is facing comprehensive challenges of energy and environment. People are still facing many problems in the selection of technical means to meet the emission standards of traditional vehicles, and in the fuel supply technology of new energy vehicles. [0003] The SCR post-treatment system relies on the accurate supply of urea reducing agent and decomposes it into ammonia gas at the front end of the catalyst to remove NOX hazards, so as to purify the exhaust gas and achieve the vehicle's National 4 or above standards. However, in actual use Among them, there are many deficiencies and difficulties in the metered injection of liquid urea that relies on urea decomposed into ammonia gas. For example, the problem of urea ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00
CPCY02T10/47Y02T10/40
Inventor 张克金崔龙陈慧明
Owner CHINA FIRST AUTOMOBILE
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