Feasibility study of the introduction of separation devices with arc-shaped elements in fluidized bed reactors
Abstract. The article provides a feasibility study for the introduction of separation devices with arc-shaped elements (SDwAE) in fluidized bed reactors. It has been shown that the currently used cyclone separators in reactors have a number of disadvantages. SDwAE was proposed as a replacement. A model of a separation device is presented and the mechanism of its operation is described. The proposed arrangement of 6 SDwAE s in a reactor to replace 12 cyclone separators is shown schematically. An estimated economic calculation showed that the cost of the project for the implementation of 6 SDwAE in reactors is estimated at 5,726 thousand rubles, which is 2.6 times cheaper than analogues (12 cyclone separators). When comparing the technical characteristics of separation devices, it was found that most of the parameters of 6 SDwAE are better than 12 cyclone separators: metal consumption 5119 kg (1.4 times lower), hydraulic resistance of about 3600 Pa (2.5 times lower), wear of the catalyst and walls device is lower due to lower operating speeds. In the course of the economic assessment of the project using the SDwAE, the following parameters were considered: discount factor Kd, discounted cash flows DCF, net present value NPV, profitability index PI and discounted payback period DPP. Possible scenarios for increasing IC to 15,000 thousand rubles are analyzed. Calculation of the profitability index PI for different initial costs of the IC project from 5726 to 15000 thousand rubles. showed that it is cost-effective, i.e. PI > 1, only in those cases in which financial flows per year CF, considering depreciation charges, are at least 1867 thousand rubles. The discounted payback period of the DPP project is 1.4 - 6.6 years with financial flows per year CF equal to 1867 - 5500 thousand rubles. with the initial cost of the IC project equal to 5726 thousand rubles..
Keywords: feasibility study, separation device, cyclone separator, discounted payback period, investment, net present value, profitability index, innovative project.
Highlights:
♦ the feasibility study was carried out for the introduction of separation devices with arc-shaped elements (SDwAE) into a fluidized bed reactor to capture finely dispersed catalyst;
♦ technical and economic comparison of 6 SDwAE and 12 cyclone separators was carried out in terms of cost, metal consumption, efficiency, hydraulic resistance, power consumption, annual electricity consumption, wear of the catalyst and apparatus;
♦ the impact of the initial cost of the project for the implementation of SDwAE in fluidized bed reactors from 5,726 to 15,000 thousand rubles was considered. and changes in financial flows CF from 500 to 5500 thousand rubles. to change the discounted payback period of the project and the profitability index.
Vadim E. Zinurov, Azaliia A. Abdullina - Kazan State Power Engineering University, Kazan, Russia; Elmira I. Salakhova, Ilnur N. Madyshev - Nizhnekamsk Institute of Chemical Technology (branch) Kazan National Research Technological University, Nizhnekamsk, Russia