Turning to high-temperature fluid, the high temperature does not give a clear meaning of the scope of the next definition. At present, the industrial measuring instruments, different types, all of the provisions of their respective scope of the corresponding high temperature. For example: the thermometer in 1500 ~ 2000 the range of high-temperature range, the control valve, valve-off valves, and other categories, when it comes at high temperatures, means more than 400 ~ 500 temperature. Flowmeter also the principles and structure of the different ways different from the high temperature range. Now the industrial temperature limit for expenditure on the differential pressure flow meter is about 540 , the volume flow meter is about 200 area flowmeter is about 400 .

The need to be measured, but in some measure on the representative of the high-temperature fluid, we listed the following three. Thermal energy as a medium or high-temperature gases, high temperature steam, with the high-speed breeder reactor, strong thermal coal - liquid metal sodium; iron and steel industry in the molten iron, steel. This is three fluid, for accuracy and the use of different materials in determining the flow requirements of different points, respectively, described the common ground is generally difficult. Therefore, this chapter, only high-temperature gases, high temperature steam used by cutting expenditure Flowmeter practical problems and to measure the electromagnetic flowmeter liquid metal as the center to describe the high-temperature fluid flow measurement.

The molten iron, steel there are two ways of measuring traffic: One is the application of high-frequency skin effect of the groove cross-sectional area of the measurement methods other is the way electromagnetic flowmeter. Both methods can be used for steel-making equipment. To be able to direct, non-contact form of measurement, also had a wide range of research and study, but in fact the general flow through the conversion of the liquid column for the high weight or bulk processing. Therefore, this chapter, not described. In addition, measuring the flow of liquid sodium metal, the pilot in the piping, installation of the ultrasonic detector, will soon be able to practical use, not the same here described.

Cutting expenditure by measuring body temperature of the fluid flow

Various examples of devices

The use of high-temperature fluid to the sector of electricity, steel, chemical industry mainly very wide scope, they have to deal with various types of fluid. In liquid, vapor, gases flow measurements, people from different principles of the structure of various types of flowmeter, the first of the expenditure on the differential pressure flow meter is applicable, in fact, applications are up. This is because its structure is simple, but is rich in data and actual experience. The results, cut expenditure as a process instrumentation devices, its credibility than any other instruments are subject to human attention.

Enterprise and the power generation plant with power generation devices to high-efficiency and large-capacity as the target, the steam boiler temperature and pressure to raise the critical temperature and pressure. Such as high-temperature steam, high pressure over the Re Zhengqi, the temperature reached 568 , the pressure of up to 240 kilograms / cm 2. Boiler flows from the high-pressure steam turbine of the general flow nozzle, and other measuring devices to reduce expenditure.

In steelmaking, ironmaking, will raise the temperature of combustion air to Chuiru BF, converter, such as sintering furnace furnace. These combustion air traffic available Venturi tube measuring devices, such as cutting expenditure. In addition, from the furnace from the high-temperature gas belong to the scope of possible Venturi measurement of the flow.

As for the high-temperature gas from the gas, it has a corrosive and contain dust, the choice of materials, to consider these characteristics and conditions of use, with the purpose of selection, corrosion-resistant materials.

In the chemical, petrochemical industry, such as: hydrogen plant, using steam to the modification of law furnace, the reaction of the temperature increase around 800-900 . Exposure to the oil refining device quality. Temperature of 420 ~ 580 , the pressure was 15 - 50 kg of force / cm 2. These devices in the furnace temperature, though a high temperature, but is to measure and control the flow into the furnace before, so. Not so high-temperature measurements of the fluid.

More than merely cite a few cases. To measure the temperature still a lot of fluid, and the list goes on.

Consider the use of high-temperature measuring device to cut expenditure fluid flow, and the choice of valve materials, the temperature at the same time paying attention to particular attention to the pressure.

Select the appropriate materials, we can measure the flow of high-temperature range. However, on the strength of materials, tensile strength, yield point is the temperature rise and fall, about 400 to achieve the above, there creep phenomenon, therefore, this temperature can be seen as a device to cut expenditure in the maximum temperature . Below described in the scope of use must pay attention to the matter.

Frame

Cutting expenditure on the construction of installations have been made detailed description, only described here should pay particular attention to the matter.