Application of flowmeter technology
The application of flow measurement technology and instruments generally includes the following fields:
Flowmeter is one of the large-scale process automation instruments and devices, which is widely used in metallurgy, power, coal, chemical industry, petroleum, transportation, construction, light textile, food, medicine, agriculture, environmental protection, people's daily life and other fields of the national economy.
In the process automation instruments and devices for industrial production, energy conservation and product improvement, the flowmeter has two main functions: the test instrument of the process automation control system and the total quantity table of measured materials.
Energy includes primary energy (coal, crude oil, coalbed methane, oil gas, natural gas), secondary energy (electricity, coke, artificial gas, oil refining, liquefied petroleum gas, steam), and loaded working medium (compressed air, oxygen, nitrogen, hydrogen) flow meters, which are important components of the energy metering system. A large number of flow meters are used for common energy (such as water, artificial gas, natural gas, steam, oil), They are indispensable tools for energy management and economic accounting.
The discharge of smoke, waste liquid and sewage seriously pollutes the air and water resources and seriously threatens the human living environment. The country chooses sustainable development as its national policy, and environmental protection will become the biggest topic in the 21st century. The control of air and water pollution requires strengthening management. The basis of management is the quantitative control of pollution. Flowmeters play an irreplaceable role in the measurement of flue gas emissions, sewage, and tail gas treatment flows.
China is a country with coal as its main energy source. Millions of chimneys throughout the country continuously emit smoke into the atmosphere. Flue gas emission control is an important project to eliminate pollution. Each chimney shall be equipped with a flue gas analyzer and flowmeter to form a fuel oil emission monitoring system.
The flow of smoke is very difficult, which is very difficult. The chimney is large in size, irregular in shape, uneven in gas composition, large in flow rate range, dirt, corrosion, high temperature, straight pipe section, etc.
There are five methods for railway, road, air, water and pipeline transportation. Pipeline transportation already exists, but its application is not universal. With the outstanding environmental problems, the characteristics of pipeline transportation have attracted people's attention. Flow meter must be equipped for pipeline transportation. It is the eye of control, distribution and dispatch, as well as the necessary tool of safety supervision and economic accounting.
The flow meter shall be selected as follows.
1. According to the fluid type and 5 considerations, the instrument types that can be initially used (several types must be available for selection);
2. Collect the data and price information about the primary selection type, and compare the preparation conditions for in-depth analysis;
3. Adopt elimination method, gradually focus on 1~2 types, repeatedly compare and analyze 5 factors, and determine the pre selection target.