CN-121983151-A - Aspen Plus-based soil remediation simulation method and system

CN121983151ACN 121983151 ACN121983151 ACN 121983151ACN-121983151-A

Abstract

The invention relates to the technical field of environmental engineering, and discloses a soil remediation simulation method and a system based on Aspen Plus, which are characterized in that petroleum-polluted soil is added into a tube furnace, thermal desorption remediation and resource recovery experiments are carried out in a nitrogen atmosphere, and gas-liquid-solid products are collected after reaction; establishing a simulation model for the PCS thermal desorption repair and resource recovery process by adopting Aspen Plus, inputting experimental parameters into the simulation model for simulation to obtain a group of simulation results, comparing the obtained simulation results with an experiment, and verifying the feasibility of the simulation model; predicting carbon emission, heat value of solid product according to the simulation model, Re Efficiency, and establishes an absolute return on system energy recovery economics and carbon emissions. The integrated analysis of process parameter optimization and energy recovery economy is realized, a reliable digital tool is provided for process research, the comprehensiveness of evaluation is improved, laboratory and industrial application are effectively linked, and the efficient energy-saving economic development of a repair technology is promoted.

Inventors

LAI TAO
CHEN HAOJIA
YANG YAN
ZHANG XIAOXIA
HUANG TIANYUE
CHEN FANG

Assignees

广东工业大学
汕头广工大协同创新研究院

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (9)

1. A soil remediation simulation method based on Aspen Plus is characterized by comprising the following steps: Step one, adding petroleum-polluted soil into a tube furnace, performing thermal desorption restoration and resource recovery experiments in a nitrogen atmosphere, and collecting gas-liquid-solid products after reaction; step two, establishing a simulation model for the PCS thermal desorption repair and resource recovery process by adopting Aspen Plus, inputting experimental parameters into the simulation model for simulation to obtain a group of simulation results, comparing the obtained simulation results with an experiment, and verifying the feasibility of the simulation model; predicting carbon emission, the calorific value of a solid product according to the simulation model, Heat of the body Efficiency, and establishes an absolute return on system energy recovery economics and carbon emissions.
2. The Aspen Plus-based soil remediation simulation system is applied to the Aspen Plus-based soil remediation simulation method of claim 1 and is characterized by comprising an experiment module, a model building module and a prediction evaluation module; the experiment module is used for adding petroleum-polluted soil into the tube furnace, performing thermal desorption restoration and resource recovery experiments in a nitrogen atmosphere, and collecting gas-liquid-solid products after reaction; The model building module is used for building a simulation model for the PCS thermal desorption repair and resource recovery process by adopting Aspen Plus, inputting experimental parameters into the simulation model for simulation to obtain a group of simulation results, comparing the obtained simulation results with an experiment, and verifying the feasibility of the simulation model; the prediction evaluation module is used for predicting carbon emission, the heat value of solid products, Efficiency and heat of And absolute returns.
3. The Aspen Plus-based soil remediation simulation system of claim 2, wherein the simulation model comprises a drying unit and a thermal desorption unit; the drying unit comprises a Heater module, a RStoic module and a Sep module; The heat module is used for heating the WET-PCS stream containing free water by using the surplus heat recovered by the heating system and the cooler; The RStoic module is used for decomposing the WET-PCS feed stream into a conventional component water H2O stream and an unconventional component DRY polluted soil DRY-PCS stream according to the water content measured by industrial analysis by setting a Fortran calculation language embedded in the Calculator module; The Sep module is used for separating the decomposed H2O stream; the thermal desorption unit comprises RCSTR modules, RCSTR modules, RStoic modules, sep modules, GAS-COOL modules, ASH-COOL modules and FLASH2 modules.
4. The Aspen Plus-based soil remediation simulation system of claim 2, wherein the carbon emissions include direct carbon emissions and indirect carbon emissions, the direct carbon emissions are determined by direct calculation of Aspen Plus, and the indirect carbon emissions E are calculated as: E=AD×EF; Where AD represents activity data, i.e. consumption of electrical energy, and EF represents regional electrical carbon emission factor.
5. The Aspen Plus-based soil remediation simulation system of claim 2, wherein the calorific value of the solid product comprises a solid product higher calorific value and a solid product lower calorific value, and the calculation formula of the solid product higher calorific value HHV is: lower heating value of solid product the LHV calculation formula is: Wherein m c1 、m c2 、m H 、m 0 、m s 、m N , M cl represents the content of organic carbon, inorganic carbon, hydrogen, oxygen, sulfur, nitrogen, water and chlorine in the PCS, respectively; 7831. 35932, 2212, 3546, 1187, 578 represent the heat value contribution coefficients of organic carbon, hydrogen, sulfur, inorganic carbon, oxygen, nitrogen, respectively; 583 represents the latent heat of vaporization of water under standard conditions and 4.184 represents the unit conversion factor for converting the unit of heating value from kcal per kg to kilojoule per kg.
6. A Aspen Plus-based soil remediation simulation system according to claim 2 wherein the The calculation formula of E x is: Wherein, the Representative chemistry Representing physical properties The calculation formula is as follows: Wherein h represents an enthalpy value, h 0 represents a standard enthalpy value, s represents an entropy value, s 0 represents a standard entropy value, T 0 represents a standard temperature, R represents an ideal gas constant, and x i represents the mole fraction of the ith component in the gas; assuming that all incoming and outgoing products are in reference conditions, physical 0, Chemistry The calculation formula is as follows: Wherein 28200.16 represents the standard chemistry of elemental sulfur per unit mass 1.0438, 0.1882, 0.2509, 0.7256, 0.3830, 0.3035 Represent constants.
7. The Aspen Plus-based soil remediation simulation system of claim 6, wherein the heat The calculation formula of E x,heat is: Wherein Q represents the heat flow of the heat exchanger and T a represents the heat source temperature.
8. The Aspen Plus-based soil remediation simulation system of claim 7, wherein the system comprises The efficiency eta calculation formula is as follows: wherein E x,product represents the total of the products E x,input represents an input to the system Is a sum of (2)
9. The Aspen Plus-based soil remediation simulation system of claim 8, wherein the absolute return AREI is calculated as: Wherein x op represents the efficiency of a plant for converting diesel into electric energy, x gp represents the efficiency of converting natural gas into electric energy, Q OIL represents the total heating value of oil products, Q GAS represents the total heating value of gas products, Q DRY represents the energy consumption of a drying unit, and Q R represents the energy consumption of a thermal desorption unit; x op Q OIL +x gp Q GAS represents the power that can be generated and Q DRY +Q R represents the input power.

Description

Aspen Plus-based soil remediation simulation method and system Technical Field The invention relates to the technical field of environmental engineering, in particular to a soil restoration simulation method and system based on Aspen Plus. Background With the increasing global energy demand, the petroleum industry is rapidly developing, however, the land environment is polluted by petroleum leakage occurring during transportation, processing and other human activities, and the petroleum polluted soil (PCS) has become an environmental problem to be solved. Among the repair technologies of PCS, thermal desorption technology is widely used because of its high efficiency and strong adaptability. However, the conventional thermal desorption technology generally introduces the organic matters generated in the process into the secondary combustion chamber for combustion treatment, which not only causes resource waste, but also accompanies higher carbon emission. In addition, the problem of damage to the soil structure and high energy consumption in the high-temperature thermal desorption treatment process also causes the problems of certain limitation. The contaminants recovered during thermal desorption can be collected and recycled for further use, which helps to reduce overall operating costs. To achieve the dual goals of pollutant degradation and resource recovery, a comprehensive treatment method combining thermal desorption remediation technology and resource recovery technology is a feasible and cost-effective Petroleum Contaminated Soil (PCS) remediation method. However, the process parameter optimization of the existing Petroleum Contaminated Soil (PCS) thermal desorption restoration and resource recovery technology is mostly dependent on experimental trial and error, and lacks systematic and efficient simulation and optimization tools, so that the process parameter optimization process has high cost and long period, and the carbon emission and energy recovery economy of the process cannot be evaluated. Disclosure of Invention Technical problem to be solved Aiming at the defects of the prior art, the invention provides a soil restoration simulation method and a system based on Aspen Plus, which have the advantages of realizing process parameter optimization and energy recovery economy integrated analysis by constructing a steady-state simulation model and integrating a multidimensional analysis module, providing a reliable digital tool for process research, improving evaluation comprehensiveness, effectively linking laboratory and industrial application, promoting efficient energy-saving economic development of restoration technology and the like. (II) technical scheme In order to achieve the purpose, the invention provides the following technical scheme that the soil remediation simulation method based on Aspen Plus comprises the following steps: Step one, adding petroleum-polluted soil into a tube furnace, performing thermal desorption restoration and resource recovery experiments in a nitrogen atmosphere, and collecting gas-liquid-solid products after reaction; step two, establishing a simulation model for the PCS thermal desorption repair and resource recovery process by adopting Aspen Plus, inputting experimental parameters into the simulation model for simulation to obtain a group of simulation results, comparing the obtained simulation results with an experiment, and verifying the feasibility of the simulation model; predicting carbon emission, the calorific value of a solid product according to the simulation model, Heat of the heat、Efficiency, and establishing absolute returns on system energy recovery economy and carbon emissions; A soil remediation simulation system based on Aspen Plus is applied to a soil remediation simulation method based on Aspen Plus, and comprises an experiment module, a model building module and a prediction evaluation module; the experiment module is used for adding petroleum-polluted soil into the tube furnace, performing thermal desorption restoration and resource recovery experiments in a nitrogen atmosphere, and collecting gas-liquid-solid products after reaction; The model building module is used for building a simulation model for the PCS thermal desorption repair and resource recovery process by adopting Aspen Plus, inputting experimental parameters into the simulation model for simulation to obtain a group of simulation results, comparing the obtained simulation results with an experiment, and verifying the feasibility of the simulation model; the prediction evaluation module is used for predicting carbon emission, the heat value of solid products, 、Efficiency and heat ofAnd absolute returns. Preferably, the simulation model comprises a drying unit and a thermal desorption unit; the drying unit comprises a Heater module, a RStoic module and a Sep module; The heat module is used for heating the WET-PCS stream containing free water by using the surplus heat recove