## 1 Introduction
It was found that the lowest gasification temperature (800 \({}^{\circ}\)C) was conducive to the removal of HCl from syngas and the rising equivalence ratio can decrease the tar. [PERSON] [14] investigated the techno-economic and environmental analysis of the coal and MSW co-gasification power system with carbon capture, and found that the net power efficiency and carbon capture rate were 35.73% and 92.88%, respectively, which indicated that the co-gasification of MSW and coal is feasible in economic terms. Based on the above publications, these studies mainly investigated various parameters, including waste composition, gasification temperature, and gasifying agents, on the co-gasification performance; the selection of gasifying agents has an important influence on the quality of syngas. Recently, the use of CO\({}_{2}\) as the gasifying agent is gaining more and more attention due to the opportunity utilization of the greenhouse gas in the gasification process [15]. Simultaneously, the application of gasifying agents (CO\({}_{2}\) and O\({}_{2}\)) is also beneficial in reducing the emission of NOx formation by preventing the contact between the gasified products and nitrogen [16], and the dilution effect of nitrogen for the syngas can be minimized. Many studies have been conducted to investigate the performance of the co-gasification process in CO\({}_{2}\) atmosphere, and coal and biomass are typically used as the feedstock. [PERSON] et al. [17] constructed the co-gasification system blending coal and biomass and performed thermodynamic analysis using Aspen plus. They found that the addition of CO\({}_{2}\) can effectively improve the energy conversion efficiency and exergy efficiency, and co-gasification of torrefied biomass and coal blends can suppress CO\({}_{2}\)-specific emissions. [PERSON] et al. [18] used an equilibrium model to investigate the performance of an integrated co-gasification of coal and microalgae with CO\({}_{2}\) utilization. [PERSON] et al. concluded that the increase of biomass/coal ratio increased gasification system efficiency and decreased cold gas efficiency, and the synergetic effect of Indonesian coal and biomass exhibited optimum gasification performance. In addition, [PERSON] et al. [19] investigated the characteristics of syngas production from the co-gasification of waste tire and pine bark in CO\({}_{2}\) atmosphere by the fixed-bed reactor at 800 and 900 \({}^{\circ}\)C. They found that the peak flow rate of H\({}_{2}\), CO, and total syngas increased with increasing pine bark mixed ratio, but C\({}_{m}\)H\({}_{n}\) decreasedat the two temperatures. Besides, the syngas yield of syngas at 800 \({}^{\circ}\)C was lower than that at 900 \({}^{\circ}\)C for a certain blend ratio. [PERSON] et al. [20] conducted CO\({}_{2}\) co-gasification experiments of horticultural waste and sewage sludge with addition of ash from waste as catalyst in a fixed-bed lab-scale gasifier, and found that the increase in agent flow improves cold gas efficiency, whereas it negatively affects the higher heating value of syngas and CO\({}_{2}\) reduction ratio. Although some researches are focused on the CO\({}_{2}\) co-gasification performance of coal and biomass or other solid fuels, most focused on the biomass/coal co-gasification aspects. However, there are no enough detailed investigations on the co-gasification of MSW and bituminous coal (BC) in CO\({}_{2}\)/O\({}_{2}\) atmosphere, especially for the analysis of its integrated system. Therefore, in this study, an innovative integrated co-gasification system of raw MSW and BC with CO\({}_{2}\) recycle and capture is developed and simulated by using a thermodynamics equilibrium model. In addition, the optimum operating parameters of gasification process, such as gasification temperature, oxygen equivalence ratio, mole of CO\({}_{2}\) to carbon ratio, and MSW blending ratio are investigated in detail. The obtained results can provide a better reference for MSW harmless disposal and resource recycling with minimum CO\({}_{2}\) emission.