Laser detection method of residual ammonia gas in solid ammonia storage system

Abstract

The invention relates to a laser measurement method for the ammonia residue of a solid ammonia storage system, which comprises a pressure sensor, a temperature sensor, a solid ammonia storage material, a storage tank, an anti-icing fluid guide pipe, an ammonia metering valve, a filter, a control display, a laser displacement sensor, a laser emitter and a laser receiver, wherein the anti-icing guide pipe is placed in the solid ammonia storage material at the bottom of the ammonia storage tank; the pressure sensor and an ammonia outlet pipe are arranged at the top of the ammonia storage tank; the temperature sensor is arranged on the tank body of the ammonia storage tank; the filter and the ammonia metering valve are arranged on the ammonia outlet pipe. The laser measurement method comprises the steps as follows: a laser distance measurement system is placed in the solid ammonia storage system in advance; when the amount of the ammonia in the system is changed, the stacking volume of active material is accordingly and correspondingly changed, a distance between a measurement point and the interface of the active material is accurately measured in a laser distance measurement method, a measurement signal is fed back to a control unit, and the ammonia residue is measured. The laser measurement method has the characteristics of smart conception, simple process, easiness for control and maintenance, low cost, high accuracy and reliability, and the like.

Description

technical field [0001] The invention relates to a laser detection method for residual ammonia gas in a solid ammonia storage system, 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 into ammonia gas. For exampl...

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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

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