Continuous Dust Monitoring of Exhaust Gases for Efficient ESP Operation

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Introduction

Exhaust gas treatment system

Exhaust gas treatment system

Exhaust gases from a pulverized coal-fired boiler contain a large quantity of dust. To prevent this from being released into the atmosphere, an electrostatic precipitator (ESP) is used to remove the dust. To maintain the collection efficiency of an ESP and prevent dust emissions, abnormalities must be detected immediately. For this purpose, continuous monitoring of the dust content in the exhaust gases is required.

Conventional dust measurement using an optical device is affected by dust buildup on the window and deviation of the light axis, necessitating frequent maintenance. The DT450G Dust Monitor utilizes inductive electrification, is easy to install, and is not affected by dust accumulation on the sensor. This makes the instrument ideal for continuous dust monitoring.

Expected Benefits

  • Monitors the operating condition of ESPs
  • Reduces the bag filter maintenance and running cost

Process Overview

The figure above shows the exhaust gas treatment system between the boiler and the stack, and the dust measurement point.

Solution Details

Field Data
Process Conditions
Dust concentration: Approx. 17 mg/Nm3
Gas flow rate: 15 m/s
Humidity 10 vol%
Temperature: 189°C

Field Test Result

Field Test ResultAccumulated dust on the electrode of an ESP is removed periodically by hammering. Instead of falling into the hopper, some of the dust stirred up by this process may circulate toward the exit, resulting in an increase in dust content. Hammering is performed sequentially in the front, middle, and rear chambers. The graph above indicates the increases in the dust content during these hammering operations, clearly showing them as peaks in the signal output by the instrument. This demonstrates that the DT450G is ideal for monitoring the efficiency and the operating conditions of ESPs.

The collection capability of an ESP varies depending on the voltage applied to the electrode. Based on the output signals of the DT450G, the applied voltage can be adjusted to maintain efficient collection.

 

 

업종

Related Products & Solutions

Dust Monitor DT450G

백 필터나 전기 집진기와 같은 대기 오염 제어 시스템은 미립자 또는 먼지를 대기 중으로 배출하기 전에 가스 스트림으로부터 분리시키는 데 사용됩니다. 제어 시스템의 효과적인 운전을 위하여 배기 가스의 먼지 농도를 일정 수준 이하로 유지하려면 배기 가스의 먼지 농도를 지속적으로 감시하는 것이 필수적입니다.

Dust Monitors

더스트 모니터는 가스의 고체 입자 수준의 변화를 나타내는 데 사용합니다.

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