A pressure equalization chamber, its installation method and a cross-sectional gas flow measurement device including it

Abstract

The invention discloses a pressure equalizing chamber, a mounting method thereof and a three-dimension space multi-point pressure measuring and cross section type gas flow measuring device containing the pressure equalizing chamber. The pressure equalizing chamber is of an isosceles triangle thin wall cavity structure, two waist edges of an isosceles triangle are each continuously provided with one or more pressure measuring openings, and all the pressure measuring openings are communicated with a thin wall cavity. By the adoption of the three-dimension space multi-point pressure measuring and cross section type gas flow measuring device, multiple pressure measuring points are arranged at different streamline positions in a three-dimension space, and due to the fact that the pressure measuring cross section exceeds the pressure measuring cross section designed by any existing measuring technology, the pressure equalizing chamber, the mounting method thereof and the three-dimension space multi-point pressure measuring and cross section type gas flow measuring device are particularly applicable to the occasion that the flow speed of a large pipe is unevenly distributed; besides, due to the special thin wall cavity structure of the pressure equalizing chamber, ash accumulation does not occur easily, ash removing needle design is further adopted, and the ash accumulation tendency is reduced to the maximum degree; the gas flow measuring device has the remarkable advantages of being resistant to blocking, resistant to wearing, resistant to high temperature, high in measuring accuracy, stable in measurement value and the like.

Description

technical field [0001] The invention relates to a pressure equalization chamber, its installation method and a three-dimensional space multi-point pressure-taking cross-sectional gas flow measuring device including it, which belongs to the technical field of gas flow measurement. Background technique [0002] In the production of modern enterprises, a large amount of wind needs to be fed into the boiler every hour, and a large amount of flue gas is produced at the same time. With the deepening of my country's economic system reform and the subdivision of economic accounting units, it has become a development trend to implement cost accounting and management and fully reduce energy consumption. The measurement of dusty gas flow in large pipelines is becoming more and more important. People are paying more and more attention to it. [0003] In the industrial production process, in the measurement of the four thermal parameters of temperature, pressure, flow, and liquid level, ...

AI Technical Summary

Problems solved by technology

[0006] The characteristics of the primary air, secondary air and flue gas of power plant boilers determine that the air volume measuring device is easy to wear and block after long-term use, and the problem of blockage is particularly difficult

The full pressure port and the static pressure port of the conventional differential pressure flow measuring device are inserted into the airflow, and the dust carried in the airflow is easy to stick to the pressure taking port and its connecting pipe due to the impact of the measuring device, flow with the airflow and frictional static electricity Inside

When the gas temperature is lower than the acid dew point and water dew point, the viscosity of the dust increases significantly, causing the dust to agglomerate in the measuring device, which aggravates the problem of clogging of the measuring device

This kind of blockage occurs inside the air volume measuring device, which can only be solved by regular blowing with compressed air, which brings a lot of maintenance workload to the thermal engineering profession.

[0007] The pipe section area of ​​the air-smoke system in a thermal power plant is large, and components such as baffle adjustment doors and support rods are arranged in the pipe. Due to the limitation of the layout space, the straight pipe section is generally short and there are many bends, resulting in a relatively turbulent flow field in the pipe. Velocity distribution and temperature distribution are seriously uneven, and the average dynamic pressure value measured at a single point or a few points cannot represent the change of the total air volume or total smoke volume of the entire flow section

[0008] In addition, the pressure loss of existing air volume or flue gas flow measurement devices is also relatively large, which is not economical to apply to thermal power plants. Differential pressure signal, but at the same time increases the flow resistance of airflow, which in turn leads to an increase in plant power consumption

Images