Measurement method of air intake flow rate for waste heat boiler with double air intake and single channel sintering ring cooler

Abstract

The invention discloses a method for measuring the air intake flow rate of a waste heat boiler of a double-air intake single-channel sintering ring cooler, which is mainly used to indirectly obtain the sintering ring cooler when the waste heat recovery of the sintering ring cooler does not directly measure the air flow rate. The air intake flow of the waste heat boiler is designed, including selecting one of the two air intake ducts of the annular cooler as the first air intake duct, and the other as the second air intake duct; the first air intake duct The air intake flow is obtained by measurement; the air intake flow of the second air intake pipe is obtained by calculation: obtain data, calculate the effective utilization heat of the waste heat boiler, and the air intake flow of the first air intake pipe of the sintering ring cooler waste heat boiler under the standard state , to solve the inlet flue gas enthalpy of the waste heat boiler of the sintering ring cooler and the wind enthalpy of the first and second air intake pipes of the sintering ring cooler, and finally obtain the air flow rate of the second air intake pipe of the sintering ring cooler waste heat boiler.

Description

technical field [0001] The invention relates to the sintering field of the iron and steel industry, in particular to a method for measuring the air intake flow rate of a waste heat boiler of a double-air intake and single-channel sintering ring cooler. Background technique [0002] In the process of iron and steel production, the energy consumption of the sintering process is second only to the iron-making process, accounting for 10% to 12% of the total energy consumption of steel production. The heat entering the atmosphere accounts for about 50% of the total energy consumption of the sintering process. Due to the low temperature of the exhaust gas of the sintering ring cooler, which is roughly 150-450 °C, and the limitations of the previous waste heat recovery technology, the waste heat recovery project of the waste gas of the sintering ring cooler has only been applied in a few large steel mills for a long time. [0003] In recent years, with the development of low-tempe...

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Problems solved by technology

[0004] For the waste heat recovery system of the sintered ring cooler, the air intake volume (flue gas volume) of the waste heat recovery section of the ring cooler is the most basic input condition, and it is also one of the main monitoring parameters for the operation of the waste heat recovery system. However, due to the sintered ring cooler The waste heat recovery system needs to occupy a large area, and the actual site conditions are mostly limited (especially for renovation projects). In other words, it is difficult to ensure that the two sections of air intake pipes can have a long straight pipe section. In actual engineering, it often happens that one of the air intake pipes is longer and the other air intake pipe is shorter.

On the other hand, due to the large amount of flue gas (air volume), the diameter of the air intake pipe of the annular cooler is very large (the diameter of the air intake pipe of a large annular cooler is even as high as 3-4m), and the flow measurement is very important for front and rear direct flow. The length of the pipe section has relatively strict requirements, so it is difficult for the project site to meet the flow measurement requirements of the air intake pipe (especially the short air intake pipe), which will inevitably cause the air flow measurement results to deviate greatly from the true value. thereby losing effectiveness

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