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Dalian Petrochemical Thermal Power Plant Flue Gas Desulfurization Project 大连理工大学Chem StrangersDalian Petrochemical Thermal Power Plant Flue Gas Desulfurization ProjectContentsChapter 1 Project Feasibility11.1 Compliance Analysis Of Project Policy.11.1.1 Analysis of industrial policy compliance11.1.2 Compliance analysis of industry compliance rules11.1.3 Compliance analysis of location or park development planning21.2 Product program21.3 The amount of raw materials, auxiliary materials and sources31.4 Economic analysis3Chapter 2 Project Brief52.1 Overview52.2 Desulfurization process selection52.3 Desulfurization process principle7Chapter 3 Introduction to Process Flow13.1 Deep desulfurization section13.2 Multi-effect evaporation section23.3 Sodium sulfate preparation section23.4 Sulfuric acid production section4Chapter 4 Energy - saving design innovation64.1 Heat transfer network64.2 Multi-effect evaporation74.3 MVR heat pump84.4 Organic Rankine cycle9Chapter 5 Equipment Selection125.1 Overview125.2 New Process Equipment Application Innovation135.2.1 Continuous spiral baffle heat exchanger135.2.2 Application of new fluid delivery equipment135.2.3 New and efficient separation equipment14Chapter 6 Site Selection and Plant Distribution16Chapter 7 Automated Control187.1 Overview187.2 Distributed Control System (DCS)187.3 Safety Instrumented System (SIS)187.4 Toxic Gas Detection System (GDS)187.5 Industrial TV monitoring system19Chapter 8 Environment and safety20Chapter 9 Project Summary222Dalian Petrochemical Thermal Power Plant Flue Gas Desulfurization ProjectChapter 1 Project Feasibility1.1 Compliance Analysis Of Project Policy1.1.1 Analysis of industrial policy compliance(1) This project is the project of Dalian Petrochemical Thermal Power Plants emission reduc-tion of 17,000 tons / year sulfur dioxide recycling economy. The main raw material source is the sodium hydroxide solution of chlor-alkali production, with the production capacity of 7,400 tons / year sodium sulfite, 12,000 tons / year of sodium sulfate and 13,000 tons / year sulfuric acid. This project is in line with the first category of encouraged categories in the Catalog of Industrial Structure Adjustment (2011) (Revised) Article 38 Environmental Pro-tection and Resource Conservation Comprehensive Utilization Article 35 Toxic, Organic Waste Gas, Odor Treatment Technology And 28 recycling of renewable resources industri-alization. (2) Petrochemical and chemical industry thirteen five development plan pointed out: to promote the industrial park industrial agglomeration, efficient use of energy, centralized management of emissions and other advanced production methods to achieve waste reduc-tion and resource, to build a circular economy industrial chain .This project is resource uti-lization of sulfur dioxide gas after flue gas desulfurization, while using clean multi - effect evaporation technology, MVR heat pump technology, in line with industry planning re-quirements.In summary, the project belongs to the country to encourage the development of the scope, and in line with laws and regulations, so the construction of the project in line with national industrial policy requirements.1.1.2 Compliance analysis of industry compliance rulesThirteen five energy-saving emission reduction comprehensive work program pointed out: to promote industrial waste reduction, implement of industrial pollution sources fully standard discharge plan, and vigorously promote the petrochemical, chemical and other industries comprehensive management of pollutants, Thirteen Five ener-gy-saving environmental protection industry development plan in the air pollution control clear research and development of desulfurization, out of stock, dust, mercury removal by-product recycling technology, the project in line with relevant development planning recommendations.The project produces 7,400 tons / year sodium sulfite, 12,000 tons / year of sodium sul-fate and 13,000 tons / year sulfuric acid,is in line with Sodium Sulfite Project Industry Ac-cess Regulations, Sodium sulfate project industry access regulations and Sodium sulfate project industry access regulations Project industry access regulations on the requirements of product size and product quality requirements.1.1.3 Compliance analysis of location or park development planningAccording to the Liaoning Province petrochemical industry development thirteen five plan, strengthen and national, the provinces national economic and social development planning, industrial policy, environmental protection policy, energy saving reduction, the project is located in Dalian City, Liaoning Province, Dalian Petrochemical plant area, (2009-2020) Article 42 of the environmental protection strategy requires to promote energy conservation and emission reduction, to speed up the construction of emission reduction facilities, to promote cleaner production, control of industrial pollution, the overall planning of the city, , The annual reduction of total pollutant emissions, Therefore, the project in line with Liaoning Province and Dalian city planning energy-saving emission reduction strategy, in line with the development plan.1.2 Product programThis project comprehensively utilizes the sulfur dioxide gas in the flue gas of Dalian Petrochemical Thermal Power Plant to convert it into high value sodium sulfite and the downstream demand of sodium sulfate and sulfuric acid products. The product scheme is shown in Table 1-1.Our products are more than 99.6%, the product grade is excellent sulfuric acid, the annual output of 13,000 tons / year, the production capacity of more than 97.5% of the sodium sulfate (including 2000 tons of food grade sodium sulfate), the annual output of 12,000 tons/ year, the content of more than 97.7% of sodium sulfite, the annual output of 7,400 tons/year.Table 1-1 Product plan and specification of this projectProductLevelspecifications (%)Output(tons / year)Price(RMB/ton)sulfuric acidindustrial grade99.71.3560sodium sulfateindustrial grade97.51700sodium sulfitefood grade990.28000sodium sulfiteindustrial grade97.70.7428001.3 The amount of raw materials, auxiliary materials and sourcesThe main raw materials and auxiliary raw materials used in this project are shown in Table 1-2 and Table 1-3.Table 1-2 List of main raw materials and auxiliary materialsProjectNameRequirementSourceType of transportMain raw materialflue gas905814Nm3/hDalian Petrochemical Thermal Power Plantpipeline transportationSodium hydroxide38,000 tons / yearDalian Petrochemical Branchpipeline transportationAuxiliary raw materialcatalyst7.9 tons / yearoutsourcingroad transportPADF membrane400m2/yearoutsourcingroad transportTechnology water4,200 tons / yearDalian Petrochemical Branchpipeline transportationAir35,000 tons / yearatmosphereTable 1-3 List of Utilities ConsumptionMaterial NameConsumptionSourceRemarksLow pressure steam (0.5MPa)28,000tons/yearDalian Petrochemical Plantcontinuous useRefrigerant7.0 tons/yearDalian Petrochemical Plantcontinuous useCirculating cooling water5.338 million tons/yearDalian Petrochemical Plantcontinuous useElectricity6.52 million degrees / yearsubstationscontinuous use1.4 Economic analysisThe project is Dalian Petrochemical Thermal Power Plant 4-6 # high-pressure boiler exhaust flue gas desulfurization treatment, and its use of resources. The project construction period is 1 year, the production period is 2 years, the production capacity of the previous two years is 70% and 90% of the full load, the full load production period is 11 years, the total project period is 14 years. The main economic indicators are shown in Table 1-4.Table 1-4 Major economic indicatorsNumberproject nameunitamountoneProject capacitypeople70twoTotal investment in the projectMillion yuan14848.271Construction InvestmentMillion yuan4184.152Working capitalMillion yuan1073.1threeAnnual total sales income (including state subsidies)Million yuan5566fourTotal cost of the yearMillion yuan2469.74fiveTotal annual profit after tax (including state subsidy)Million yuan2815.26sixAnnual sales tax and surchargesMillion yuan281SevenAnnual income taxMillion yuan164.4eightFinancial evaluation index1Investment profitability%27.722Investment tax rate%43.53Capital tax rate%37.284Static investment payback periodyear5.895Dynamic Payback Periodyear6.26Financial internal rate of return%267Financial net present valueMillion yuan1988.8Chapter 2 Project Brief 2.1 OverviewAccording to the actual situation of the thermal power plant, the use of circular economy integration of the new concept, in order to achieve deep desulfurization in line with national and local sewage standards at the same time, the energy integration of the plant, the power plant into a energy plant, truly For the purpose of treasure.The project uses sodium hydroxide solution to absorb sulfur dioxide in the flue gas, purify the flue gas discharge standards, absorb the rich liquid sodium bisulfite into the product conversion device, by heating, adding acid way to produce sodium sulfite and sodium sulfate product sales, while using The sulfur dioxide produced by its continued use of sulfuric acid production, part of the acid back to the above-mentioned section, part of the acid as a finished product for sale, acid sulfur waste gas cycle back to desulfurization station after desulfurization emissions. The use of sulfuric acid, sodium sulfate and sodium sulfite three products of the coupling, due to product price fluctuations in the inconsistency, by adjusting the proportion of products can get better economic benefits, with strong resistance to market risk. The project flow chart is shown in the figure2-1Figure 2-1 Project flow diagram 2.2 Desulfurization process selectionThe main pollutants in the flue gas are sulfur dioxide, nitrogen oxides and particulate matter, all of which are produced in the combustion process. There are three main methods for flue gas desulfurization: fuel hydrodesulfurization;dry and semi-dry desulfurization;wet desulfurization process.Dalian City petrochemical thermal power plant boiler fuel is mainly catalytic slurry, the presence of asphalt in the sulfur is difficult to remove, and the hydrogenation unit a one-time investment is higher, desulfurization efficiency is low; dry flue gas desulfurization process began in the 80s Desulfurization and absorption products are treated in dry condition, dry desulfurization containers and pipes are easy to clog, atomizer easy to wear and rupture; system reliability is poor, application performance is less; wet desulfurization technology using alkali as absorbent , Relatively simple, low investment, technology promotion early, at present in the major power plants, boiler systems have been more widely promoted and applied. Among them, the use of desulfurization agent, the more widely used are limestone, Na2CO3, MgO, NaOH and so on.Taking into account the advantages and disadvantages of the above three types of methods, due to the current Dalian Petrochemical power plant space area tension, to save land area, can not use limestone, Na2CO3, MgO as the project of the absorbent. Ammonia as an absorbent is currently used in the desulfurization project of PetroChina Karamay Petrochemical Plant, but due to the existence of aerosol effect, it has a great influence on the surrounding environment, and the current supply of ammonium sulfate and ammonium bisulfate market in Dalian is sufficient, The cost of the product is reduced. Although the NaOH aqueous solution is relatively high relative to the raw material price, resulting in higher operating costs, but taking into account its simple process, low investment, small footprint, stable operation, and the current market supply is sufficient, Dalian Petrochemical Company has sufficient and complete Lye storage, supply system to meet the requirements of the new amount of the project, in addition, the use of sodium hydroxide desulfurization, circulating water is basically an aqueous solution of sodium hydroxide, in the cycle of the pump, pipes, equipment, no corrosion and congestion Phenomenon, to facilitate the operation and maintenance of equipment, compared to more suitable for this project.In summary, this project is intended to use NaOH solution as the project of the absorbent wet desulfurization technology. The use of NaOH solution as desulfurization absorber has been successfully applied to Linfen Thermal Power 2300MW unit desulfurization project, Jinchuan Group tail gas treatment project, Chengdu Hongbo Molybdenum Company.2.3 Desulfurization process principleThe main reaction mechanism using sodium hydroxide solution as the absorbent is as follows:Na2SO3 reacts with SO2 in the flue gas to form Na2SO3. Na2SO3 reacts with SO2 to form NaHSO3. During the whole desulfurization process, NaOH is only used as the starting absorbent. Na2SO3 is the main reaction. The main reaction is as follows:Initial stage:SO2+2NaOHNa2SO3+H2OThe basic chemical reactions in the desulfurization process are:SO2+Na2SO3+H2O2NaHSO3references: 1 TAN Chang-jun.Study on desulfurization process of sodium alkali method and its engineering application D. Southeast University, 2015.2 (Department of Chemistry and Chemical Engineering, Shanghai University of Science and Technology, Wuhan 430074, China); Study on Flue Gas Desulfurization Technology of Sodium Alkali J. Journal of Shanghai University: Natural Science Edition, 2013, 19 (5): 4747Dalian Petrochemical Thermal Power Plant Flue Gas Desulfurization ProjectChapter 3 Introduction to Process FlowThe project is based on the requirements of green technology, implement the principle of energy saving and emission reduction and economic efficiency improves the principle of economic efficiency, the process of raw materials, process modules are innovative design, and on this basis for technical integration, the process involved in the workshop , Condition optimization, full process simulation and energy matching. The whole process is shown in Figure 3-1.Figure 3-1 Full process simulation 243.1 Deep desulfurization sectionThe boiler is burned to the flue gas and sent to the electrostatic precipitator for dust removal. The sulfur-containing exhaust gas from the solid particles and the sulfuric acid plant is removed into the desulfurization tower T101, and 30% by weight of the hydrogen from the tank Sodium oxide solution countercurrent contact, purify flue gas standards sent to the plant chimney, absorbing liquid by pumping to the product conversion device. The process of deep desulfurization is shown in Figure 3-2.The concentration of sulfur dioxide in the flue gas was 31.41mg / Nm3, which was lower than that of the Emission standard of air pollutants in thermal power plants, and the concentration of sulfur dioxide in the flue gas was about 7.2: 1, GB13223-2011 in the ultra-clean emission requirements of 35mg / Nm3.This project uses alkaline sodium hydroxide solution can achieve the purpose of deep desulfurization in the desulfurization of flue gas in line with the national ultra-clean emission targets at the same time the depth of resource utilization, taking full account of the downstream demand will absorb rich liquid to the follow-up section The output of sulfuric acid and sodium sulfate products, taking into account the increase in value-added products, follow-up section of the joint production of high value-added sodium sulfite products, making the plant operating a certain economic benefits, to avoid the traditional long-term loss of desulfurization device operating state.Figure 3-2 Deep desulfurization section simulation3.2 Multi-effect evaporation sectionDesulfurization tower T101 tower bottom rich liquid pump to the buffer tank V101, 40% rich liquid sent to the second section of sodium sulfite evaporation and concentration. The rich liquid is heated to 128 C into the evaporator, the evaporator discharged from the liquid by the separator 20% of its forced cycle back to the evaporator again evaporation, evaporation and concentration using multi-effect evaporation technology, each effect decreased, respectively A certain temperature difference, the use of secondary steam generated by the evaporator to the next cycle of circulating fluid heating, compared to the traditional single-effect evaporation, the reduction of the amount of steam generated 63.6%. The pressure of the three-effect evaporator is controlled to 0.1MPa, 0.06MPa and 0.02MPa respectively. The secondary steam temperature generated by the evaporator is controlled at 108 , 96 and 71 respectively. The sodium sulphite after evaporation was concentrated by a downstream crystallization separation apparatus to give 97.7% sodium sulfite product.Figure 3-3 Simulation of multi-effect evaporation section3.3 Sodium sulfate preparation sectionAs shown in Figure 3-4, the desulfurization tower T101 tower bottom liquid to the buffer tank V101, 60% of the rich liquid to the third section of sodium sulfate evaporation concentrated crystallization. Concentration using MVR heat pump evaporation technology, liquid and from the fourth section of the output of the dilution and cooling to 40 sulfuric acid into the buffer tank V301, the reaction to produce sodium sulfate, and the release of a certain amount of sulfur dioxide gas. The material i