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Calculation method for dust-containing airflow density of primary air tube of intermediate coal pulverizing system

A pulverizing system and airflow density technology, which is applied in the field of calculation of the dust-laden airflow density in the primary air duct of the storage type pulverizing system

Inactive Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, there is still a lack of a calculation method in the prior art to eliminate the influence of pulverized coal on the airflow density, so as to obtain accurate and reliable airflow velocity results

Method used

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  • Calculation method for dust-containing airflow density of primary air tube of intermediate coal pulverizing system
  • Calculation method for dust-containing airflow density of primary air tube of intermediate coal pulverizing system
  • Calculation method for dust-containing airflow density of primary air tube of intermediate coal pulverizing system

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Experimental program
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Embodiment 1

[0058] The method of the present invention is used to calculate the flow rate of air powder air flow in the primary air duct of a boiler of a certain company's power station and a certain boiler:

[0059] (1) Determination of relevant parameters:

[0060] Table 1 Example 1 parameter measurement result

[0061]

[0062] (2) Bring the parameters into the following calculation formula for calculation:

[0063]

[0064] Result: Dusty airflow density ρ=1.1382 kg / m3 .

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Abstract

The invention relates to a calculation method for the dust-containing airflow density of a primary air tube of an intermediate coal pulverizing system in a power station boiler. The technical scheme of the invention is as follows: total mass Mz in the air powder airflow and the total volume Vz of the air powder airflow are calculated to obtain the density rho of the air powder airflow, and then the flow speed v of the air powder airflow of the primary air tube is calculated. In the method disclosed by the invention, the volume part of the dust-containing airflow comprises two parts: one part is hot air, the other part is pulverized coal, and the volume of the pulverized coal is very low relative to the hot air; the mass part of the dust-containing airflow also comprises two parts: one part is hot air, the other part is pulverized coal, and the volume of the pulverized coal can be ignored. The calculation method has the advantage that the influence of the addition of the pulverized coal after the mixing of the air powder of the primary air tube on the dust-containing airflow density is considered, thus calculation for the dust-containing airflow density is more scientific and accurate, and the calculated dust-containing airflow speed is also more accurate, thus control on the air quantity of a power plant is more precise, and the safety and economical efficiency of the running of the power plant are improved.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a method for calculating the dust-laden airflow density of a primary air duct of a storage type pulverizing system in a power station boiler. Background technique [0002] The intermediate storage pulverizing system usually installs an online flow rate measuring device on the primary air duct to detect the air flow rate of the primary air duct to ensure the safe operation of the primary air duct. [0003] The air flow velocity online measurement device is usually installed in front of the air powder mixer, and the air flow velocity after the air powder mixing is calculated by the air temperature before mixing, the air temperature after the air powder mixing, and the air flow velocity measured by the measuring device, that is to say, the air powder The airflow velocity after mixing is realized by calculating the parameters of the measuring device and wind temp...

Claims

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Application Information

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IPC IPC(8): G01N9/04
Inventor 马登卿樊孝华汪潮洋马辉周若明卢晓
Owner STATE GRID CORP OF CHINA
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