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Pulverized coal fineness online measuring device and method based on charge induction

A technology of pulverized coal fineness and charge induction, which is applied in the direction of measuring devices, particle size analysis, particle and sedimentation analysis, etc., can solve the problems of not being able to meet the real-time adjustment of boilers, long and short measurement periods of pulverized coal fineness, and achieve Short measurement period, low maintenance cost, satisfying the effect of real-time adjustment

Pending Publication Date: 2020-10-16
南京大得科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the current problem that the coal fineness measurement cycle is long and cannot meet the real-time adjustment needs of the boiler, and provides an online measurement device and method for coal fineness based on charge induction. According to the calculation of the induced charge of the pulverized coal particles in normal motion and the induced charge of the pulverized coal particles flowing through the curve, the online measurement of the pulverized coal fineness is realized, and the measurement period is short, which meets the needs of real-time adjustment of the boiler

Method used

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  • Pulverized coal fineness online measuring device and method based on charge induction
  • Pulverized coal fineness online measuring device and method based on charge induction
  • Pulverized coal fineness online measuring device and method based on charge induction

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Effect test

Embodiment 1

[0030] An on-line measurement device for coal powder fineness based on charge induction, including a flange 2, a first induction electrode 3, a second induction electrode 5, an elbow diversion groove 4, a signal conditioning unit 8 and a signal acquisition and calculation unit 9. The first sensing electrode 3 and the second sensing electrode 5 are respectively connected to the signal conditioning unit 8 through the first shielded signal cable 6 and the second shielding signal cable 7, and the signal conditioning unit 8 is used to control the first sensing electrode 3 and the second sensing electrode The electric signal of 5 is amplified, filtered and signal converted, and the output terminal of the signal conditioning unit 8 is connected with the signal acquisition and operation unit 9 .

[0031] Such as figure 1As shown, the flange 2 is fixedly installed on an outer side wall of the pulverized coal pipeline 1 , and the elbow guide groove 4 is installed on an inner side wall o...

Embodiment 2

[0044] The working principle of pulverized coal flowing through the online measuring device of this scheme is as follows:

[0045] The airflow with coal powder flows through the first induction electrode 3 and then flows through the diversion groove 4 of the elbow. When the pulverizing system is in normal operation, the flow velocity of the pulverized coal airflow is generally 15-32 m / s. The pulverized coal airflow belongs to the gas-solid two-phase flow, and it is a dilute phase flow. The pulverized coal is crushed and the pulverized coal particles in the process of pneumatic transmission Charges will be generated on the surface, and when the pulverized coal particles flow around the first sensing electrode 3 and the second sensing electrode 5, induced charges will be formed on the corresponding metal electrodes, and these induced charges will pass through the first shielded signal cable 6, the second shielded signal cable The cable 7 is led into the signal conditioning unit ...

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Abstract

The invention provides a pulverized coal fineness online measuring device based on charge induction. The device comprises a flange, a first induction electrode, a second induction electrode, an elbowdiversion trench, a signal conditioning unit and a signal acquisition and operation unit. The flange and the elbow diversion trench are respectively arranged on the outer side wall and the inner sidewall of the pulverized coal pipeline. The first induction electrode and the second induction electrode penetrate through the side wall of the pulverized coal pipeline and are installed on the flange,the second induction electrode extends into the bent pipe flow guide groove, the first induction electrode and the second induction electrode are connected into the signal conditioning unit, and the output end of the signal conditioning unit is connected with the signal acquisition and operation unit. The invention further provides a pulverized coal fineness online measuring method based on chargeinduction. By utilizing different inertias of particles with different finenesses when the particles flow through the curve, according to calculation of inductive charges of pulverized coal particlesin normal motion and inductive charges of the pulverized coal particles when the particles flow through the curve, online measurement of the pulverized coal fineness is realized, the measurement period is short, and the requirement of real-time adjustment of a boiler is met.

Description

technical field [0001] The invention belongs to the technical field of pneumatic conveying dilute-phase gas-solid two-phase flow, in particular to an online measurement device and method for coal powder fineness based on charge induction. Background technique [0002] In order to improve the economy of power plant boiler operation, it is necessary to reasonably control the fineness of coal pulverized into the furnace. If the pulverized coal is too fine, the combustion will be incomplete, which will reduce the efficiency of the boiler; if the pulverized coal is too fine, it will increase the power consumption of the coal mill and reduce the dust removal effect. Therefore, the fineness of pulverized coal should be determined after comprehensive consideration of the requirements for pulverized coal fineness of the combustion coal type and the operating costs of coal mills. Through the online measurement system of pulverized coal fineness, the accurate change trend of pulverize...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N27/60
CPCG01N15/02G01N27/60G01N15/0266
Inventor 梅义忠
Owner 南京大得科技有限公司
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