1, collection efficiency Bag filter has a higher and more stable than the electrostatic precipitator collection efficiency, particularly serious impact on the human body of heavy metals and submicron dust particles capture more useful. Any dust removal efficiency of up to 99.9%, and the concentration of dust emissions to stabilize below the 50mg / Nm3, even up to about 10mg / Nm3, near-zero emissions. Predicament low emissions, visual inspection can not see smoke exiting the chimney. From the current situation of coal-fired boilers use electricity industry point of view, we can guarantee the baghouse emission in 30mg / Nm3 or less. Hohhot boiler flue gas dust removal plant with two 200MW units of bag filter, in addition to our Zhengzhou Xinli Electric Power Co., Ltd. (formerly Zhengzhou Thermal Power Plant) 200MW unit electrostatic precipitator bag filter for the technological transformation from CEMS monitoring system manual sampling and test the effectiveness of the detection unit, the emission concentrations were lower than 27mg / Nm3. 2, change on dust and coal-fired boiler system 2.1 If the wind changed, the amount of soot change 1 pair of bag filter: emission concentration constant cleaning frequency change (automatic adjustable). Two pairs of electrostatic precipitator: dust removal efficiency change, emission concentration change. 2.2 If the same amount of smoke, air volume change 1 pair of bag filter: equipment plus the amount of wind resistance and large big plus, filtration velocity increase collection efficiency does not substantially affected. Two pairs of ESP: the impact resistance of the equipment is not large, large increase in volume collection efficiency wind drops very obvious. 2.3 If the temperature change 1 pair of bag filter: flue gas temperature is too low may cause condensation “paste bag” and the housing erosion, smoke Wentai Chong noble high temperature filter material allows easy “burn bag” and damage the bag, but the initiation temperature of these consequences extreme temperatures (accident / abnormal state), is required to do precipitator asylum measures. But as long as the flue gas temperature in the selected filter to withstand temperature range, does not affect the collection efficiency. Two pairs of ESP: condensing flue gas temperature is too low or high pressure can cause erosion housing creepage, flue gas temperature than the direct resistance, thus affecting the collection efficiency, and the impact is more obvious. 2.4 The chemical composition of flue gas (or coal burning) change. 1 pair of bag filter: The filter compliant range of conditions, there is no effect on the collection efficiency. Two pairs of ESP: chemical composition of flue dust than direct resistance, thus affecting the collection efficiency, and the impact is very large. 2.5 distribute airflow 1 pair of bag filters: removal efficiency and airflow spread nothing but the local stream error can not be too large, otherwise due to uneven load caused by wear and tear or partial jet broken bags. Two pairs of ESP: very sensitive to electric fields in air distribution, airflow spread black and white directly affect the collection efficiency of irregularities. 2.6 and the air preheater system pipe leakage. 1 pair of bag filter: oxygen tolerance for poor performance will affect the filter bag life, such as: RYTON filter, but the collection efficiency is not affected. Two pairs of electrostatic precipitator: equipment resistance no significant changes, but the wind increased wind speed is equivalent to an increase of the electric field, affecting efficiency of dust removal efficiency. 3, run and administered 3.1 Run 1 pair of bag filter: stable, simple control, no high-pressure equipment, safe and good, close cooperation with the boiler running close, administered by the harsh requirements. Two pairs of electrostatic precipitators: running interference identity and more control is relatively complex, high-pressure equipment safety protection requirements high. Boilers run on less demanding, but severe equipment requirements administered. 3.2 shutdown and startup 1 pair of bag filter: convenient, need to do work bag asylum lasting outage. Two pairs of electrostatic precipitators: convenient, you can stop at any time. 3.3 Inspection and Maintenance 1 pair of bag filter: less maintenance, repair can be non-stop, three or four years time to replace the filter bag is relatively heavy workload.

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