Method for measuring flow of high-temperature highly corrosive flue gas

Abstract

The invention provides a method for measuring the flow of high-temperature highly corrosive flue gas. The method includes the following steps: 1), installing a Venturi flowmeter on a high temperature flue gas pipeline firstly, introducing the high-temperature flue gas into the Venturi flowmeter, and regulating the temperature of the high-temperature flue gas in a pressure measuring tube on the Venturi flowmeter to 100-180 DEG C; 2) measuring the temperature T and the pressure intensity P of the high-temperature flue gas entering the Venturi flowmeter, and measuring the differential pressure delta P of the Venturi flowmeter; 3) based on the temperature T, the pressure intensity P and the differential pressure delta P of the Venturi flowmeter, obtaining the actual flow Q1of the flue gas (please see the formula defined in the specification), and converting the Q1 into a flow value Q0 in the standard condition, wherein K refers to the flow coefficient of the Venturi flowmeter. The method is based on the properties of high-temperature highly corrosive flue gas, a radiator is adopted for cooling or a ribbon heater is adopted for thermal insulation, it is guaranteed that the flue gas in the pressure measuring tube reaches an appropriate temperature, dew point corrosion caused by the flue gas is prevented, the condensation droplet high-temperature gasification cycle is prevented, pressure fluctuation is avoided, and it is ensured that the measurement process is reliable and stable and the measurement is accurate.

Description

technical field [0001] The invention relates to a method and system for measuring the flow rate of high-temperature and strong corrosive flue gas, and belongs to the technical field of flow measurement of high-temperature and strong corrosive flue gas. Background technique [0002] Incineration is a common method of hazardous waste disposal. The thermal condition of the incinerator kiln is the decisive factor of the process. However, because the environmental protection post-treatment process of the hazardous waste incineration flue gas is lengthy, the flue gas flow rate in the whole process changes drastically. It becomes the basis of the whole engineering optimization and control strategy. [0003] However, at present, there are many problems in the flow measurement of high-temperature and highly corrosive flue gas. During the measurement process, problems such as preventing dew point corrosion of flue gas, preventing high-temperature gasification cycle of condensed water...

AI Technical Summary

Problems solved by technology

The thermal condition of the incinerator kiln is the decisive factor of the process. However, because the environmental protection post-treatment process of the hazardous waste incineration flue gas is lengthy, the flue gas flow rate in the whole process changes drastically. become the basis of the entire engineering optimization and control strategy

[0003] However, at present, there are many problems in the flow measurement of high-temperature and highly corrosive flue gas. During the measurement process, problems such as preventing dew point corrosion of flue gas, preventing high-temperature gasification cycle of condensed water droplets, and avoiding pressure fluctuations have become urgent problems to be solved. These problems The measurement process is unstable, the reliability is poor, and the measurement data is inaccurate

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