Precision device for detecting ammonia decomposition rate based on physical properties of ammonia

Abstract

A precision device for detecting an ammonia decomposition rate based on the physical properties of ammonia, comprises a water inlet pipe and an ammonia dissolving pipe, wherein a water inlet pipe upper cover is installed on the upper end of the water inlet pipe; a water inlet pipe plug is installed on the lower end of the water inlet pipe; a liquid pressure transmitter is installed on the left side of the water inlet pipe; the water inlet pipe is equipped with a full water level sensing switch and an initial water level sensing switch; the full water level sensing switch is located above the initial water level sensing switch; a water inlet pipe vent and a water inlet pipe water replenishing pipe are installed on the water inlet pipe plug at the top of the water inlet pipe; a water replenishing explosion-proof solenoid valve is installed on the water inlet pipe water replenishing pipe; a low water level sensing switch is installed on the right side of the water inlet pipe; the water inlet pipe is in communication with the ammonia dissolving pipe through a water inlet explosion-proof solenoid valve; and the top of the ammonia dissolving pipe is in communication with a gas purifying cylinder through a pipeline. The precision device is simple in overall structure and cannot expose the water inlet pipe to the air.

Description

technical field [0001] The invention relates to an ammonia decomposition rate detection precision device based on the physical characteristics of ammonia gas, and belongs to the technical field of ammonia decomposition rate devices. Background technique [0002] At present, the ammonia decomposition rate is generally detected manually by using an ammonia decomposition rate detector, and then according to the measured decomposition rate and combined with the nitriding process flow, the temperature in the nitriding furnace and the flow rate of ammonia gas entering the furnace are manually adjusted. The whole process is 72 After 108 hours of sleepless nights, fatigue and negligence lead to inaccurate measurement of ammonia decomposition rate, inadequate temperature regulation, and untimely flow regulation, which often lead to poor or excessive permeation of nitriding objects. This method also has the disadvantages of ① not being able to automatically measure, ② not being able t...

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Problems solved by technology

There are some following problems: 1) due to the completion of gas extraction and measurement in the same container, the corrosiveness of ammonia and ammonia water limits the use of measuring devices; the pressure in the container is affected by the pressure of the hot nitriding furnace, so that some It is not feasible to measure the pressure change and convert the water level height into an electrical signal; the impurities in the furnace gas will have a great impact on the measurement results, 2) because the exhaust gas that is continuously connected to the container for a period of time is used to empty the previous measurement cycle The remaining tail gas, which is a mixture of hydrogen and nitrogen, is difficult to discharge by this method, which also affects the value of the decomposition rate measured in the next cycle

Chinese patent application number: 200410024888.9, the name of the invention is: ammonia decomposition furnace automatic test device, the measurement work of ammonia decomposition is separated from the acquisition and discharge of nitriding furnace tail gas with two containers, the measurement results of this invention have been improved to a certain extent, However, there are: 1. Since the remaining tail gas in the previous measurement cycle is emptied by continuously inserting the tail gas into the container for a period of time, and the remaining tail gas is a mixed gas such as hydrogen and nitrogen, it is difficult to discharge it by this method, which also affects the next The value measured in one cycle according to the decomposition rate; 2. The water storage is directly connected to the external environment, which makes it easy for impurities such as dust to enter, thus affecting the measurement results

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