SolarÀcoal hybrid power generation (SCHPG) system is one of the interesting solutions for solar power generation. This research aims to find a more viable integration mechanism of solar energy into a coal-fired thermal power plant in terms of techno-economic and ecology perspective. Performance of the 300 MW SCHPG system in the nominal and part-load condition is analyzed under three different integration mechanisms. Numerical simulation of 300 MW SCHPG system is investigated under four different cases using a thermal balance approach. Operation modes of fuel-saving (FS) and power-boosting (PB) are considered for each case. Among the proposed cases, Case 4 is obtained as a good operation performance, which is recommended as the main case. The solar energy in Case 4 is used for evaporating feedwater and steam superheating, and steam reheating. Results show that the optimal aperture area of the heliostat solar field is 330 330 m 2 , and the minimum levelized cost of electricity is 0.1847 USD kWh À1. In Case 4, thermal efficiency is increased by 7.19% with standard coal consumption reduced by 45.3 g kWh À1 compared to a reference power plant. In the SCHPG system, coal consumption is reduced by 26.8 tons h À1 in FS mode, whereas power output is increased 30 MW h À1 in PB mode.

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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, SO 2 , 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, SO 2 , 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.

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