年產(chǎn)18萬噸丙烯-54萬噸環(huán)氧丙烷項(xiàng)目-英文摘要

1、年產(chǎn) 18 萬噸丙烯-54 萬噸環(huán)氧丙烷項(xiàng)目-英文摘要CONTENTS1 Abstract of Project32.Technology Description42.1 Producing Propylene by Propane Dehydrogenation Section42.2Propylene Epoxidation Section43 Optimization and energy saving of heat exchange network63.1 Other Energy-saving Measures74 Equipment Designing105 Automatic

2、Control116 Plant layout127 Economic analysis138 Conclusion141 Abstract of ProjectThis project relies on the branch of SECCO Petrochemical Company Limited, with an annual output of 180000 tons of propylene and 54 million tons of propylene oxide. Factory is located in Chemical Industry Park (SCIP), Ca

3、ojing, , covers an area of 83933 square meters,with a variety of modes of transport shipping, railways, waterways, it owns a excellent geographical environment.This project uses the imported propane dehydrogenation catalyst to produce propylene, the product quality is more than 99.9% of the pure pro

4、duct, one part of propylene is for the parent plant, the other part of propylene reacts with hydrogen peroxide to prepare propylene oxide. At the same time, the project also has a high value of industrial by-products, such as propylene glycol and propylene glycol monomethyl ether.This project can no

5、t only ease the domestic supply of propylene, propylene oxide, but also significantly contributes to the stability of domestic and foreign propylene, propylene oxide market, showing obvious economic and social benefits.Tab.1 Product specificationsProductYield/ 104 tonsPurityPropylene17.899.9%Propyle

6、ne oxide53.499.9%Propanediol0.2899.9%Propylene glycol monomethyl ether1.0299.9%All of above meet GB / T14491-2001 national standards, this purity propylene oxide can be sold to manufacturers producing propylene glycol, propylene glycol, propionaldehyde, polyether, isopropanol amine, higher fatty aci

7、d ester surfactants, plasticizers, pharmaceuticals, pesticides, perfumes, foam products. Propylene is transported to the parent plant to produce polypropylene.2.Technology Description2.1ProducingPropylenebyPropaneDehydrogenation SectionThe Oleflex technology of producing propylene by propane dehydro

8、genation has the most development potential considering the feasibility, cleaning, innovation and economy of the process. According to a rough economic calculation, using the imported propylene to produce in Chemical Industrial Park has the most economic production cost and economic cost. Overall, t

9、he project decides to import propane as raw material and use Oleflex technology to produce propylene continuously.Fig 2.1 Schematic Diagram of Propane Dehydrogenation Section2.2Propylene Epoxidation SectionWe believe that HPPO process meets the current needs of the domestic and foreign market and th

10、e development of the chemical industry requirements accordingto feasibility energy efficiency, cleanliness, innovation and economy of the process . Propylene oxidemade by HPPO technology has a high yield and is little constrained by external for raw materials; with low steam demand, there are small

11、emissions of waste and few requirements for infrastructure projects, construction and operation management is relatively approachable as well as high utilization rate of raw materials with little by-product. HPPO process can save 20% (for the backward production capacity, energy savings of up to 40%

12、)than chlorohydrin process. Above all, the project utilizes propylene and hydrogen peroxide as raw materials and the TS-1 catalyst to produce propylene oxide intermittently.Fig 2.2 Schematic Diagram of Propylene Epoxidation Section3Optimizationandenergysavingofheat exchange networkThe optimization o

13、f heat exchanger network method is in the pinch point design method to get maximum energy recovery exchanger thermal network based, after tuning, the number of the heat exchanger decreases, so as to obtain the optimal or suboptimal design scheme. The main methods for reducing the number of heat exch

14、angers are flowing unit division and cutting off the heat circuit (energy relaxation method).Through observation we found that there were some heat exchangers in the heat exchanger network, which are obviously unreasonable. By means of energy relaxation, it is combined with the adjacent heat exchang

15、ers, in order to reduce the number of heat exchangers. While reducing the heat exchanger, the removal of unnecessary shunting operation can reduce the total cost, and make the heat exchanger network more convenient to decorate.In the end, our total cost index is 3.458, the required heat public work

16、is 4.499*109kJ/h, the cold public works are 3.810*109kJ/h, the number of heat exchangers is changed to 30.Compared with the original process flow, the total cost is reduced by about 48%.The effect of energy recovery is very obvious.Fig3.1 Heat Exchanger Network Optimization3.1 Other Energy-saving Me

17、asures3.1.1 Ethylene - propylene Cascade RefrigerationWe used Aspen Plus to cascade refrigeration system, obtained ethylene flow of 2.615 * 106kg / h, the propylene flow rate of 6.718 * 107kg / h. The simulation results are shown in Table 3.1.Table 3.1 Results of Cascade Refrigeration Aspen Plus Sim

18、ulationCompressorEthylenePropyleneFlow/（kg/h）2.615*1066.718*107Inlet Pressure/bar11Inlet Temperature/-102.610Outlet Pressure /bar16.2518Outlet Temperature /7897Power ofCompressor/kW1.7544*1063.5765*106Effectiveness ofCompressor0.720.72At the same time, in order to reduce the types of cold utilities

19、and reduce the complexity of public works plant, we optimized T103, T201 and T203 three towers overhead condenser to cascade refrigeration system and replace the condenser, respectively, to complete the cold supply.3.1.2 Heat pumps rectification columnHeat pump distillation process of fully thermall

20、y coupled propylene columns is shown in the figure，propylene (material s-1) in the top of the tower transfers heat with propane (materials S-6) in the bottom of the tower by the compressor. Then through throttling expansion and auxiliary heat exchanger, part of the reflux is taken.Due to the gas pha

21、se tower top discharge, liquid phase tower kettle material, the top of the tower column reactor was added flash tank separated flow logistics (material S- 8, S-9) and product (material C3H6 - out, PP).After the simulation of heat pump distillation and the conventional distillation, the comparison of

22、 heat pump distillation process and conventional distillation energy is shown as follow:Table 3.2 Comparison of Energy Consumption of Heat Pump Distillation with Ordinary DistillationCoolingEnergy/kwHeating Energy/kwHeatpumpdistillation-4.028*1041.555*105Ordinarydistillation-1.773*1051.844*105Energy

23、 Saving76.27%15.67%As we can see from the table, though some of the equipment will increase investment costs using a heat pump distillation, it can also significantly reduce energy consumption, considering the use of heat pump distillation technology we can make this process more economical and ener

24、gy saving.4 Equipment DesigningAccording to the simulation results of Aspen, combined with the experience of chemical reaction engineering, we designed the two different types of reactors, and obtained the specific parameters of R101 and R201. Using SW6-98 and KG-tower software to process the typica

25、l tower equipment process design, basic parameter design and mechanical strength check. Based on SW6-98 and Design Exchanger and Rating, the process design type selection, basic parameter design and mechanical strength check of all heat exchangers were carried out. In addition，pumps, flashtanks, gas

26、-liquid separation tanks, compressors, tanks, buffer tanks, reflux tanks,heating furnaces and other equipments were designed in selection.5 Automatic ControlThis project used DCS (distributed control system) to control the whole process, including propylene oxide reactor feeding proportional control

27、, multi-temperature overhead reflux flow pressure cascade control, epoxidation reactor control and feedforward - feedback control etc., due to the process stream containing flammable gas propylene, propane, hydrogen and oxygen and other oxidizing gas, there are security risks, therefore, the process

28、 gas stream monitoring is particularly important. We mainly use PLC for controling and monitoring, the content of online real-time monitoring and control instruments in the process gas stream and the data is sent to the central control room, the timely regulation of device parameters, thus ensuring

29、the safety and reliability of the entire device. In addition, the project also analysed the risk of the various devices and Operability Analysis (HAZOP), in order to ensure the safety of process.6 Plant layoutThe whole design magnifies the construction on reserved vacant land inside of the parent fa

30、ctory with the full consideration on harmonization with its original layout. Reasonably safe fireproof distance, optimized pipeline arrangement, both of two fully guarantee the safe production, separation of people and vehicles, saving land, and reasonable greening. The design team also applied seve

31、ral kinds of 3D software such as Google Sketchup, Navisworks and PDMS to make 3D analog simulation and 5D workshop simulation.7 Economic analysisTab.7Main economic indexesSerialnumberItemUnitCount1Production scale104t/a54(Propylene oxide)2Annual operating dayshours/a72003Total land aream2839334Numbe

32、r of employees/1045Total investmentMillion Yuan29.36Total annual costMillion Yuan /a487Gross output value of the wholeplantMillion Yuan/a668Total annual net profitMillion Yuan/a159ROI%51.7210Profit and tax investment ratio%63.5911Investment payoff periodyears4.5612IRR%35.913NPVMillion Yuan338 Conclu

33、sionIn designing the project of an annual output of 180000 tons of propylene - 54 million tons of epoxy propane inSECC, we referred to the relevant paper, books and reading the corresponding national standards, laws and regulations, and did related market research to do feasibility study and preliminary design to the project. We finished heat integration and energy saving technology, equipment selection, automatic control, general layout and transportation, environment analysis, economic analysis, utilities, labor quota