Mass flow meter based detection method for remaining ammonia amount of solid ammonia storage system

A technology of mass flowmeter and detection method, which is applied in the direction of exhaust gas treatment, electrical components, and electric control of exhaust gas treatment devices, etc., which can solve the problems of reduced NH3 adsorption, low adsorption and desorption efficiency, and affecting the use effect, etc. Achieve effects that are conducive to emission reduction, high practical value, reliability and accuracy

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] After CaCl2 adsorbs NH3, it is closely connected with the surrounding particles, forming an agglomeration with almost no pores, and it is difficult for the rest of NH3 to enter this area, resulting in a greatly reduced NH3 adsorption and hindering the formation of ammoniacal calcium chloride complexes; phase Compared with the loose adsorbent powder, the adsorbent solid block formed by direct mechanical pressing has fewer ammonia gas transmission channels, and the adsorption and desorption efficiency is low; in addition, the volume of CaCl2 adsorbs NH3 expands, and the solid block is easy to powder. Fragmentation, affect the use effect

Method used

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  • Mass flow meter based detection method for remaining ammonia amount of solid ammonia storage system
  • Mass flow meter based detection method for remaining ammonia amount of solid ammonia storage system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare a stainless steel pressure-resistant storage tank with an effective volume of 32L, fill 15kg of solid ammonia storage material into the storage tank, and complete the ammonia filling, weighing system, the ammonia filling volume is 14.7kg; purchase commercially available pressure sensors, temperature sensors and Ammonia gas mass flowmeter, purchase the display controller with built-in PID control program, according to the analog parameter of the flowmeter used is the voltage of 0~5V, when the flow rate of ammonia gas is 0L / min, the corresponding analog parameter is 0V, when When the flow rate of ammonia gas is 20L / min, the corresponding analog parameter is 5V, and the calculation program of a) b) c) three flow accumulations are programmed into the board of the display controller, and the green lights corresponding to the three states, Yellow light and red light display table; complete the wiring and connection between the above units; connect the antifreeze heatin...

Embodiment 2

[0024] Using the ammonia storage and release ammonia control metering system prepared in Example 1, start the mass flow meter and the display controller, continue heating and releasing ammonia, the ammonia flow rate is 5SLP (that is, standard liters per minute), and when the ammonia release time is 0min, the display The controller displays a green light; when the ammonia release time is 3326 minutes, the green light turns into a yellow light. At this time, the cumulative amount of ammonia released by the mass flowmeter is 12.64kg; the control accuracy is within the required range.

Embodiment 3

[0026] Continue to adopt the ammonia storage and release ammonia control metering system tested in Example 2, continue to carry out continuous heating and release ammonia, and the ammonia gas flow rate is 5SLP. When the ammonia release time is 3719 minutes, the display controller displays a red light; at this time, the cumulative amount of ammonia release by the mass flowmeter is 14.13kg;

[0027] In the relevant inventions that have been given, for the pressure sensor 1, the temperature sensor 2, the solid ammonia storage material 3, the antifreeze conduit 4, the ammonia gas inlet and outlet 6 and the ammonia storage tank 7 have been described; the innovation of the present invention is Introduced the combined control and metering method of ammonia gas mass flow meter 5 and display controller 8;

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Abstract

The invention relates to a mass flow meter based detection method for the remaining ammonia amount of a solid ammonia storage system. The method is characterized in that an ammonia mass flow meter is arranged in an ammonia storage tank and is connected in series onto an ammonia delivery pipe and connected with a display controller, a pressure sensor mounted on the ammonia storage tank is connected with a temperature sensor, an ammonia mass flow meter and a DCU, and the DCU and the display controller are connected with an ECU. Three remaining ammonia amount level control points are set according to the cumulant difference of the ammonia feeding amount W and the output ammonia amount Wi to remind a driver system whether the system is normal, whether ammonia is required to be fed and whether ammonia is exhausted. The method has the advantages of being ingenious in idea, simple in process, easy to control, low in cost, safe and reliable, easy to maintain and the like.

Description

technical field [0001] The invention relates to a method for detecting the residual ammonia volume of a solid ammonia storage system based on a mass flow meter, which is applied to an SCR post-treatment system of automobile tail gas 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00H01M8/04H01M8/04313H01M8/0438
CPCY02T10/47Y02E60/50Y02T10/40
Inventor 张克金崔龙陈慧明
Owner CHINA FIRST AUTOMOBILE
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