StudyonProductionProcessFormulaofWasteTireRubberPowderModifiedAsphalt

Wang Guoqiang

(ChinaElectronicSystemEngineeringNo.4ConstructionCo.,Ltd.,Tianjin300131)

This paper introduces a formulation process for the production of waste tire rubber powder modified asphalt, that is, adding high-efficiency activator, lignosulfonate and other additives to the base asphalt, which greatly increases the mixing amount of waste tire rubber powder and reduces the production cost of waste tire rubber powder modified asphalt, and provides a reference for the production of waste tire rubber powder modified asphalt.

Keywordswaste tire rubber powder asphalt lignosulfonate

StudyonCarryingProblemofCokePowderinDelayedCokingUnit

Li Xichun

(DongyingUnitedPetrochemicalCo.,Ltd.,Dongying257000)

This paper analyzes in detail the causes of coke powder carrying in the delayed coking unit, and proposes control measures for coke powder carrying from the perspective of process and equipment. Taking the operation of a company’s 2.3 million t/a delayed coking unit as an example, the process control measure for coke powder carrying is proposed. Taking the revamping of delayed coking equipment by related enterprises in the same industry as an example, two types of equipment modification measures are proposed to reduce the carrying of coke powder.

Keywordscoke powder carrying process control equipment modifi-cation

ResearchonUltrafinePowderCoolingTechnologyandHeatTransferCharacteristics

Liu Rentao, et al

(ChinaChengdaEngineeringCo.,Ltd.,Chengdu610041)

This paper introduces a newly developed powder fluidized cooling system, expounds the advantages of this technology compared to traditional technology, and analyzes the heat transfer characteristics of the powder fluidized cooler of its core equipment, and proposes a correction calculation method for the cooler, to correct the calculation deviation of simply using the heat exchanger analysis software to provide support for the engineering application of this technology.

Keywordsfluidized cooling ultrafine powder gas-solid heat transfer

carrier-gas fluidized bed

DesignofHighTemperatureOilandGasDustRemovalProcessforPulverizedCoalPyrolysis

Liu Jia, et al

(ShanghaiElectricGroupState-ownedGlobalEngineeringCo.,Ltd.,Taiyuan030024)

The dust removal technology of dust-containing high-temperature oil and gas restricts the development of low-temperature pyrolysis of pulverized coal. Through the analysis of the characteristics of high-temperature oil and gas of pulverized coal pyrolysis, the requirements for the dust removal process are put forward. Compared with the characteristics and application of the current high-temperature dust removal technology, the dust removal method of cyclone separator rough filtration + filter element dust collector fine filtration is selected to ensure the filtration pressure drop and filtration accuracy. In the design of dust removal, considering the factors that may affect the operation of the unit, process optimization measures are proposed, and the replacement preheating system and the offline oxidation regeneration system are added. The replacement preheating system ensures the safety of the gas system entry and avoids the condensation adhesion of dust-containing tar under start-up condition. The offline oxidation regeneration system effectively removes adhering combustible substances, and when being used with the back-blowing system, it accelerates the regeneration progress and realizes the recovery of the filter performance of the filter element. Through the optimization of the dust removal process, the service life of the filter element is increased, and the operating cost is reduced. The tar product is basically dust-free, and the long-period operation of the dust removal system is realized.

Keywordshigh temperature oil and gas dust removal pulverized coal pyrolysis process design filter element preheating regeneration

DesignandApplicationofCryogenicPipelinesinLargeAirSeparationUnit

Zhou Bobo

(HualuEngineering&TechnologyCo.,Ltd.,Xi’an710065)

Based on examples, this paper analyzes the material selection, connection and cold insulation measures of low-temperature piping in the cold box and the material selection, connection, sealing and thermal insulation mechanism of the vacuum insulation piping outside the cold box for the low-temperature characteristics of the air separation unit. According to the requirements of precise prefabrication for on-site installation of vacuum insulated pipes, solutions are proposed.

Keywordsair separation unit cryogenic pipeline material selection connection cold insulation

DiscussiononValueofTemperatureVariationRangeinCalculationofPipelineDisplacementStressandCounterForce

Kang Shengfeng, et al

(SINOPECShanghaiEngineeringCo.,Ltd.,Shanghai200120)

In the calculation of piping stress, although pipeline displacement stress and counter force are important calculation conclusions and design basis, the temperature range is an important parameter that determines the displacement stress level and counter force of the pipeline. This paper mainly focuses on the differences between the temperature range values in the calculation of pipeline displacement stress and counter force, and the value of the temperature range under the most severe working conditions. At the same time, the conclusions discussed are applied in practice with CAESAR II software.

Keywordsstress calculation temperature range displacement stress counter force CAESAR II

TubeSheetDesignofaSpecialHighPressureU-TubeHeatExchanger

Wang Ren, et al

(ChinaChengdaEngineeringCo.,Ltd.,Chengdu610041)

Based on the U-shaped tube sheet edge rotational stiffness parameter formula, this paper proposes tube sheet design method for a special high pressure U-tube heat exchanger by using SW6 software, which provides reference for the engineering design of tube sheet for this type of high pressure U-tube heat exchanger.

Keywordshigh pressure heat exchanger U-tube sheet

BriefDiscussiononHoistingofLargeTowerEquipment

Ding Ran

(HualuEngineering&TechnologyCo.,Ltd.,Xi’an710065)

With the rapid development of China’s chemical industry, large-scale equipment is used more and more widely in chemical construction. Taking an on-site hoisting of a methanol scrubber in a 700,000 t/a coal-to-olefin project as an example, this paper introduces the on-site hoisting process, summarizes the key technical types and methods of large-scale equipment hoisting, calculates and verifies the safety of the lifting lugs in hoisting.

Keywordsoverall hoisting large-scale equipment hydraulic jacking lifting lugs

FiniteElementContactAnalysisofTooth-TypeQuick-OpeningStructure

Zhang Xuan, et al

(YinchuanCollegeofChinaUniversityofMiningandTechnology,Yinchuan750021)

In this paper, the contact element of Ansys software is used to simulate and analyze the tooth meshing process of the toothed quick-opening structure. The focus is on the contact stress of the quick-opening structure under two states of complete meshing and circumferential displacement, and it is concluded that the stress concentration area is mainly distributed at the tooth root of the tooth block. The linear evaluation of the dangerous section of the quick-opening structure is carried out, and the normal working condition range of the autoclave is determined: when the internal pressure does not exceed 3.0 MPa, the circumferential displacement is allowed to be between 5%～8%. This research provides a reference for improving the service life of toothed quick-opening structural materials and for optimizing process of product design.

Keywordstooth-type quick-opening structure finite element simulation contact stress analysis linearization evaluation

AnalysisandImprovementofFunctionBlockofBusPAofHollysysDistributedControlSystem

Ke Rongzong, et al

(GuonengShenfu(Shishi)PowerGenerationCo.,Ltd.,Quanzhou362700)

The fieldbus instrument of a power plant communicates with Hollysys DCS system through PROFIBUS PA protocol. The PA_TRANS function block is responsible for data analysis of field instruments. In field applications, the function block lacks the offset correction function for the process value. This paper implements the offset function by writing, recompiling and encapsulating of function blocks, and adding correction variable.

Keywordsfieldbus PA_TRANS function block local variable analysis

OperationAnalysisofHighSmoke&DustEmissionfromElectrostaticPrecipitatorof1050MWUltra-SupercriticalCoal-FiredGeneratingUnit

Yao Xiliang, et al

(GuonengShenfu(Shishi)PowerGenerationCo.,Ltd.,Quanzhou362712)

This paper takes the electrostatic precipitator of a million-kilowatt No. 3 coal-fired generating unit in Fujian Province as the background, and solves technical problems by problem-oriented analysis and research. For a period of time, the emission of smoke and dust from the ESP of this unit fluctuates periodically, and the online flue gas monitoring system (CEMS) collects the value of smoke and dust emission every five minutes. When the fluctuating peak of smoke and dust emission is collected, the hourly average value of smoke and dust emission will be higher, which will affect the standarlized emission of net smoke and dust. By operating parameter analysis, reasoning and experimentation, it is concluded that the main reason for this problem is that the amount of flue gas entering the A side of the electrostatic precipitator is greater than that on the B side, causing the A side five electric field anode plates to accumulate more dust than the B side. At the same time, the high flow rate of the flue gas on the A side will carry the agglomerated flue dust generated by the five electric field rapping on the A side into the desulfurization system, causing the flue gas to fluctuate greatly. After finding the causes of the problem, the electrostatic precipitator is adjusted by means of proper “Acts-to-Situation", which finally alleviated the problem of large fluctuations in smoke and dust, and which has a certain reference significance for the management of environmental protection equipment in electric power industry.

Keywordselectrostatic precipitator ultra-low emission smoke & dust fluctuation rapping adjustment uniform air flow distribution

ApplicationofSafetyRiskAnalysisbasedonDynamicSimulationinCarbonMonoxideShiftConversionProcess

Liu Qin

(SINOPECNingboEngineeringCo.,Ltd.,Ningbo315103)

This paper introduces the process of using Aspen Hysys software to dynamically simulate the HAZOP analysis of the feed separator level of the carbon monoxide shift conversion unit. Through dynamic simulation, the impact of the level change on the subsequent system is quantitatively analyzed, which can provide certain guidance and reference for the HAZOP quantitative analysis of similar unit.

KeywordsHAZOP dynamic simulation CO shift conversion feed separator level

ApplicationofHAZOPAnalysisandLOPA-SILGradinginMethanolSynthesisUnit

Li Yang, et al

(HualuEngineering&TechnologyCo.,Ltd.,Xi’an710065)

In this paper, the Hazard and Operability Analysis (HAZOP) method is used to qualitatively analyze the safety of a methanol synthesis plant in an engineering project, and corresponding safety recommendations are proposed. And on this basis, the layer of protection analysis (LOPA) method is used to analyze the relevant SIL grading in interlocking scenarios to further determine whether the existing safety measures can make the risk within an acceptable range. If the risk is relatively high, the corresponding safety instrument level (SIL) will be selected to reduce the risk value, to effectively realize the risk evaluation of the methanol synthesis unit, and to ensure the intrinsic safety of the plant by reducing risks.

KeywordsHAZOP LOPA methanol synthesis interlocking