Study for Decreasing Emissions in the Flue Gas from Fuel Combustion of Steam andHot Water Boilers of Thermal Power Plant and Heating Plants of Mongolia

Tseyen-Oidov Jagvanjav1, Z. Nermunkh1, A. Tumenbayar1, and T. S. Amarjargal2

1. Mongolian University of Science and Technology

2. “Mon Energy Consulting” Co., Ltd

Abstract: This paper mainly describes the current situation of the main thermal energy sources and some experimental results of total suspended particles (TSP) control equipments of reconstructed steam boilers and new hot water boilers.

Coal-fired power plants provide the majority of power generation for Mongolia. In 2014, coal consumption of the three main thermal power plants (TPP) in Ulaanbaatar is 4.824 million tons and all 7 TPPs — 5.97 million tons. The TSP, SO2, NOx emissions from these power plants in Ulaanbaatar are 13.977, 37.328, and 11.331 tons, respectively. Therefore, more stringent emission standards on TSP, SO2, CO and NOx are urgently needed to reduce current emissions to acceptable levels.

We tested TSP control equipments of TPPs and heating plants for determining TSP or fly ash concentration in the flue gas and these removal efficiencies. As a result average efficiency of the electrostatics precipitators’ is 96.8-99%, wet scrubbers with Venture tubes — 85-90%, and dry cyclones — 45-60%, which were lower than their designed value. But flyash removal efficiency of bag filters is 99.7-99.9%. Comparison bag filter efficiency with ash collector (packet cyclone-centrifugal force) of the steam boilers No. 1 and No3 of TPP#2 in Ulaanbaatar more 54.3% and fly ash average concentration in the flue gas is lower 72.5 times [1].

In order to reduce pollutants concentration in the combustion product polluting the environment it is important to improve the operation regime of the main equipments and ash collectors of the Thermal energy sources as well. There is an urgent need ecological friendly renovation of thermal energy sources and to introduce an advanced combustion technology, use the options measures and reduce TSP concentration in the discharging smog.

Key words: steam boiler, hot water boiler, TSP, fly ash, ESP, bag filter, mechanical collector, efficiency