化工设计摘要.docx

1、化工设计摘要1. Process Design1.1Raw Material and ProductsThe raw material of this project is C4 hydrocarbon mixture, whose composition as follows:Table1-1 Composition of Raw MaterialsCompositionFraction/wt%i-butane0.4n-butane5.81-butylene37.27Cis 2-butene4.0Trans-2-butene5.16i-butene1.171,2-butadiene-1,3-

2、butadiene45.31-butyne-2-butyne-Vinyl acetylene0.7C50.1C30.1Table1-2 Composition and Specification of ProductsItemTest methodNational standard/%Company standard/%QualityProduction（kt/a）1,3-butadieneGB/T13291-200899.50（wt%）99.7%(wt%)excellent grade163propyleneGB/T 7716-200299.60（V/V）99.7%(V/V)excellen

3、t grade145ethyleneGB/T7715-200399.90（V/V）99.9%(V/V)first-class321.2Process SchemeThis project consists of two sections: butadiene extraction and raffinate C4 catalytic cracking. The section of butadiene extraction is to extract the butadiene from the C4 hydrocarbon mixture raw material, which consis

4、ts of double extracting, double stripping and butadiene purification. The section of catalytic cracking consists of catalytic cracking and separating, which produced polymer grade propylene and ethylene.Figure1-1 Butadiene Extraction Produce PFDFigure1-2 Raffinate C4 Cracking Produce PFD1.3Main Inno

5、vation of Process(1).C4C8 olefins can be reacted in the ZSM-5 catalyst. So the C4C5 olefins can be recycled to the raw material, which improves the yield coefficient of propylene.(2) We found the best conditions of catalytic cracking reaction from related patent. But the best dimension of the reacto

6、r is unknown. For that, we simulated three different aspect ratios of reactor by using Comsol Multiphysics. From the result of simulation, we got the best dimension of reactor. Figure 1-3 The Result of Simulation by Comsol Multiphysics(3).The control parameter can be optimized by Aspen Dynamics, whi

7、ch has guiding significance for the practical operation.Figure 1-2 The Simulation of Propylene Coupling Tower2. Energy-saving Design2.1Simulation of Heat Exchanger NetworkAccording to pinch point theory, we analyzed the heat exchanger network of the production of butadiene, propylene and ethylene by

8、 Aspen Energy Analyzer, researching the bottleneck of the using of heat exchanger network, so as to find out the irrational parts and reasons. With that we can meet the minimum cost of utility system and equipment.Figure 2-1 Butadiene Extraction Section Energy MatchingFigure 2-2 Raffinate C4 Crackin

9、g Section Energy MatchingFigure 2-3 Part of Heat Exchange Method Simulation2.2Tertiary Refrigeration TechnologyThe traditional refrigerant methane, ethylene and propylene are mixed proportionately in a refrigeration compressor to offer kinds of refrigerant of different temperature level to the cooli

10、ng utility system. With this technology, we turned three independent refrigerating system into one, which reduced the cost of equipment.3. Security Scheme3.1Security Risk AnalysisThe tanks of butadiene, propylene and ethylene are the major hazard installations, which is analyzed by Risk system. By s

11、imulating pool fire accident, vapor explosion accident and vapor cloud explosion model, we can forecast the damage range and take the safety measures.3.2Event Tree AnalysisBy using event tree to analyze the gas-liquid separator, we obtain the improvement method.4. Equipment DesignAccording to the pr

12、ocess simulation results from Aspen plus, we design the reactor R0201, de-ethane tower T0202 and heat exchanger E0103 in detail. With the help of KG-tower and SW6-98, we checked all towers in this project. Also, all the heat exchanger is checked by SW6-98 and Aspen HTFS. Besides, we accomplished the

13、 model selection of all the standard equipment such as pump, compressor, tower, storage tank, buffer tank, reflux tank etc.5. Control SchemeTaking the “safety first” as our design principle, HAZOP is used to analyze the butadiene extraction tower, catalytic cracking reactor, compressor and propylene

14、 tanks. Then, we utilize Aspen Dynamics to simulate the control conditions of propylene coupling tower.6. Layout SchemeFrom the comparison of the Xinjiang Kelamayi Municipality Dushanzi District, Fujian Province Quanzhou Municipality Quangang District and Tianjin Municipality Binhai District, we fin

15、ally selected Xinjiang Kelamayi Municipality Dushanzi District as the site of our plant for its superior geographic location, abundant raw material source and privilege national policy.The layout scheme followed the policy of “Take the advantage of every inch of land, preserve every inch of farmland

16、”. Adjust measures to local conditions, land conservation, and improve land use. Our plant layout scheme as follows:Figure 6-1 Plant Layout7.Economy AssessmentThrough the investment estimate and financial evaluation, we obtained the comprehensive technical and economic index shown as table 7-1.Table

17、 7-1 Comprehensive Technical and Economic IndexNo.ItemUnitAmount1Production capacityKt/a3502Plant aream21024083Architectural aream223025.44Operation day in a yearHours/year80005The project total investmentTen thousand Yuan170568.66Fixed asset investment(FAI)Ten thousand Yuan106797.77Direct material

18、costTen thousand Yuan287481.098Total staff numberpeople1809Annual total costTen thousand Yuan/a403071.410Annual sales proceedsTen thousand Yuan/a487391.011Annual total net profitTen thousand Yuan/a59669.7712Investment profit ratio%29.8613Static rate of investment returns%43.4414Internal rate of retu

19、rns%18.9615Payback periodYear4.7316NPVTen thousand Yuan89256.548. SummaryTaking the “safety and steady, energy-saving and environmental protection, harmonious development” as our design principle, we accomplish the whole preliminary design of 350kt/a C4 comprehensive utilization project.The raw mate

20、rial source and product scheme are made by researching related patent and market analysis. Then, Aspen plus is used to complete the calculation of this process. According to the simulation result, Aspen Energy Analyzer is used to optimize the process of energy integration. Also, with the help of Asp

21、en plus, we accomplished the simulation calculation of the utility. In aspect of security, we cite Dows Fire & Explosion index method to assess the tanks and forecast the damage range by Risk system. In aspect of control, we utilize HAZOP、 event tree analysis to analyze part of equipments, and Aspen Dynamics is used to optimize the control parameters of propylene coupling tower. At last, the catalytic cracking reactor is optimized by Comsol Multiphysics.