CN105938092A - True boiling point distillation curve correction method based on crude oil real-time nature - Google Patents

Abstract

The invention discloses a true boiling point distillation curve correction method based on a crude oil real-time nature; firstly, a near infrared crude oil fast evaluation technique is adopted to obtain TBP distillation data of currently processed crude oil; then process simulation software is used for simulation and calculation to obtain simulation values of sideline products; next, laboratory test values of the sideline products in a current atmospheric and vacuum device are actually measured, and fitting calculation is carried out by using the process simulation software based on the simulation values and the laboratory test values of the sideline products; and finally, a crude oil TBP curve after correction is obtained. The TBP curve after correction is closer to the nature of the currently processed crude oil, is helpful to improve the accuracy of the simulation of the atmospheric and vacuum device, and lays the foundation for the follow-up device real-time optimization.

Description

A kind of true boiling point curve bearing calibration based on crude oil real-time

Technical field

The present invention relates to oil refining manufacture field, particularly relate to a kind of true boiling point distillation based on crude oil real-time (TBP) Curve correcting method.

Background technology

Atmospheric and vacuum distillation unit is the first operation of oil refining processing, can obtain including Petroleum, aerial kerosene, light by distillation All multi-products such as diesel oil, heavy diesel fuel.Atmospheric and vacuum distillation unit is one of maximum energy-dissipating device of oil plant, accounts for refining oil total power consumption 25%-30%.By the real-time optimization of device, high-value product yield can be improved, reduce plant energy consumption, refinery's economy is imitated The lifting of benefit is significant.

Crude oil TBP distillation data are the fundamental basis of crude refining, the accuracy of TBP curve and atmospheric and vacuum distillation unit simulation Accuracy is directly related.At present, most of Petrochemical Enterprises still use traditional history oil property data to enter atmospheric and vacuum distillation unit Row simulation and optimization, and history crude data tends not to accurate characterization and currently processes the real-time of crude oil, its analog result Often produce relatively large deviation with actual condition.Even if additionally, using near-infrared crude oil Fast Evaluation to be relatively as the criterion True crude oil TBP curve, through reality test checking, the TBP curve being back-calculated to obtain with actual side line character still suffers from certain error. Accordingly, it would be desirable to be corrected according to actual linear confrontation crude oil TBP curve.

Summary of the invention

For the problems referred to above, the present invention proposes a kind of true boiling point curve bearing calibration based on crude oil real-time, The method comprises the following steps:

A kind of true boiling point curve bearing calibration based on crude oil real-time, the method comprises the following steps:

1) near-infrared crude oil Fast Evaluation is utilized to obtain the current true boiling point distillation data processing crude oil；

2) utilize process simulation software, according to crude oil true boiling point distillation data be simulated calculate, obtain primary distillation tower and The difference that each sideline product of atmospheric tower is corresponding distillates the analogue value of a temperature；

3) measure difference corresponding to current primary distillation tower sideline product each with atmospheric tower and distillate the actual value of a temperature；

4) analogue value and the measured value of a temperature are distillated based on the difference that each sideline product of primary distillation tower and atmospheric tower is corresponding, profit It is fitted calculating with process simulation software, the true boiling point curve of crude oil after being corrected.

Preferably, step 4) described in the Fitting Calculation: choose that primary distillation tower is different with atmospheric tower sideline product distillates a temperature The analogue value and measured value sum of square of deviations minimum as optimization aim:

$J=min\[{\mathrm{\ω}}_k^i\underset{k=1}{\overset{5}{\Σ}}\underset{i=1}{\overset{5}{\Σ}}{(T_{S,k}^i-T_{T,k}^i)}^2\]$

Wherein,For step 2) in the calculated primary distillation tower of process simulation software and The difference that each sideline product of atmospheric tower is corresponding distillates the analogue value of a temperature,

Corresponding not for each sideline product of primary distillation tower in actual condition and atmospheric tower The same measured value distillating a temperature,For weight,

Wherein subscript i represents primary distillation tower and the different product of each side line of atmospheric tower, and subscript k represents that primary distillation tower and atmospheric tower are each The difference of sideline product distillates a little.

Preferably, described the Fitting Calculation, use following decision variable:

T={T₁,T₂,T₃,T₄,T₅}

Wherein, T_j(j=1,2 ..., 5) be respectively in current processing the true boiling point of crude oil distillation data 10%, 30%, 50%, 70%, the temperature that the fraction yield of 90% is corresponding.

Preferably, each sideline product of described primary distillation tower and atmospheric tower is respectively as follows: and just pushes up oil, often pushes up oil, a normal line oil, often Two wires oil and atmosphere 3rd side cut oil, difference distillate a little be respectively as follows: initial boiling point, 10% distillate point, 50% distillate point, 90% distillate a little and end Evaporate a little.

Preferably, to distillate a corresponding weight as follows for the difference of described primary distillation tower and each sideline product of atmospheric tower:

${\mathrm{\ω}}^1=\{{\mathrm{\ω}}_1^1=3,{\mathrm{\ω}}_2^1=4,{\mathrm{\ω}}_3^1=4,{\mathrm{\ω}}_4^1=4,{\mathrm{\ω}}_5^1=10\}$

${\mathrm{\ω}}^2=\{{\mathrm{\ω}}_1^2=3,{\mathrm{\ω}}_2^2=5,{\mathrm{\ω}}_3^2=3,{\mathrm{\ω}}_4^2=7,{\mathrm{\ω}}_5^2=10\}$

${\mathrm{\ω}}^3=\{{\mathrm{\ω}}_1^3=2,{\mathrm{\ω}}_2^3=1,{\mathrm{\ω}}_3^3=1.6,{\mathrm{\ω}}_4^3=1,{\mathrm{\ω}}_5^3=0.6\}$

${\mathrm{\ω}}^4=\{{\mathrm{\ω}}_1^4=10,{\mathrm{\ω}}_2^4=5,{\mathrm{\ω}}_3^4=15,{\mathrm{\ω}}_4^4=15,{\mathrm{\ω}}_5^4=150\}$

${\mathrm{\ω}}^5=\{{\mathrm{\ω}}_1^5=2,{\mathrm{\ω}}_2^5=15,{\mathrm{\ω}}_3^5=15,{\mathrm{\ω}}_4^5=1.6,{\mathrm{\ω}}_5^5=15\}$

Wherein, ωⁱ(i=1,2 ..., 5) the most just push up oil, often push up what oil, a normal line, normal two wires and atmosphere 3rd side cut comprised The weight that each temperature spot is corresponding.

Beneficial effect:

The present invention proposes a kind of TBP curve correcting method based on crude oil real-time, fast initially with near-infrared crude oil Speed assessment technique obtains the TBP of current processing crude oil and distills data, utilizes process simulation software to be simulated calculating, obtains each side The analogue value of line product；Then the actual value of each sideline product of current atmospheric and vacuum distillation unit is measured；Simulation based on each sideline product Value and measured value, utilize process simulation software be fitted calculate, finally obtain corrected after crude oil TBP curve.Correction After TBP curve more press close to current to process former oil properties, this will assist in the accuracy improving atmospheric and vacuum distillation unit simulation, for Follow-up device real-time optimization lays the foundation.

Accompanying drawing explanation

Fig. 1 TBP curvature correction flow chart

Comparison diagram before and after Fig. 2 TBP curvature correction

It is embodied as case

Elaborating embodiments of the invention below, the present embodiment is carried out under premised on technical solution of the present invention Implement, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following enforcement Example.As a example by certain enterprise's atmospheric and vacuum distillation unit, this enterprise's atmospheric and vacuum distillation unit has Petrochemical Enterprises typical process, including primary distillation tower, often Pressure tower and vacuum tower.

TBP curvature correction flow chart is as shown in Figure 1.

(1) on the basis of current time 2015-04-07 21:00, utilize crude oil near-infrared Fast Evaluation to obtain and work as The property data of front processing crude oil, in said process, the TBP utilizing near-infrared Fast Evaluation to obtain current processing crude oil steams Evaporate the content of data, preferably refer to patent of invention " a kind of oil property method for quick based on compound forecast technique ", Publication number: CN 103364364A.Obtain crude oil TBP distillation data as shown in table 1.

Table 1 crude oil TBP distills data

(2) (or other have the soft of similar functions to use the general process simulation software Aspen-Plus of Petrochemical Enterprises Part, such as PROII, Petro-SIM etc.), utilize the distillation of the crude oil TBP in step (1) data to carry out flowsheeting, obtain each side line The analogue value of product, in the present embodiment, each sideline product of primary distillation tower and atmospheric tower is respectively as follows: and just pushes up oil, often pushes up oil, a normal line Two wires oily, normal oil and atmosphere 3rd side cut oil；Difference distillate a little be respectively as follows: initial boiling point (0%), 10% distillate point, 50% distillate point, 90% Distillate a little and the end point of distillation (100%).Meanwhile, the measured value of current atmospheric and vacuum distillation unit sideline product is measured.Atmospheric and vacuum distillation unit side line The analogue value of product quality indicator is as shown in table 3 with measured value.

The analogue value of table 3 Atmospheric vacuum sideline product quality index and measured value

(3) determine that the difference that each sideline product is corresponding distillates the weight of a temperature as follows:

${\mathrm{\ω}}^1=\{{\mathrm{\ω}}_1^1=3,{\mathrm{\ω}}_2^1=4,{\mathrm{\ω}}_3^1=4,{\mathrm{\ω}}_4^1=4,{\mathrm{\ω}}_5^1=10\}$

${\mathrm{\ω}}^2=\{{\mathrm{\ω}}_1^2=3,{\mathrm{\ω}}_2^2=5,{\mathrm{\ω}}_3^2=3,{\mathrm{\ω}}_4^2=7,{\mathrm{\ω}}_5^2=10\}$

${\mathrm{\ω}}^3=\{{\mathrm{\ω}}_1^3=2,{\mathrm{\ω}}_2^3=1,{\mathrm{\ω}}_3^3=1.6,{\mathrm{\ω}}_4^3=1,{\mathrm{\ω}}_5^3=0.6\}$

${\mathrm{\ω}}^4=\{{\mathrm{\ω}}_1^4=10,{\mathrm{\ω}}_2^4=5,{\mathrm{\ω}}_3^4=15,{\mathrm{\ω}}_4^4=15,{\mathrm{\ω}}_5^4=150\}$

${\mathrm{\ω}}^5=\{{\mathrm{\ω}}_1^5=2,{\mathrm{\ω}}_2^5=15,{\mathrm{\ω}}_3^5=15,{\mathrm{\ω}}_4^5=1.6,{\mathrm{\ω}}_5^5=15\}$

Wherein, ωⁱ(i=1,2 ..., 5) the most just push up oil, often push up what oil, a normal line, normal two wires and atmosphere 3rd side cut comprised The weight that each temperature spot is corresponding.

(4) the temperature conduct that the fraction yield of TBP distillation the 10% of data, 30%, 50%, 70%, 90% is corresponding is chosen Decision variable, chooses the primary distillation tower analogue value that distillate a little different with atmospheric tower sideline product minimum with measured value sum of square of deviations For optimization aim, it is shown below:

$J=min\[{\mathrm{\ω}}_k^i\underset{k=1}{\overset{5}{\Σ}}\underset{i=1}{\overset{5}{\Σ}}{(T_{S,k}^i-T_{T,k}^i)}^2\]$

Wherein,The difference that primary distillation tower sideline product each with atmospheric tower is corresponding respectively evaporates Go out the analogue value of a temperature,It is respectively primary distillation tower sideline product each with atmospheric tower corresponding Difference distillates the measured value of a temperature,For weight shown in step (2).

(5) according to actual process index, the constraints of optimization is determined, as shown in table 4.

Table 4 constraints

(6) based on above-mentioned optimization aim and constraints, Optimizer module in Aspen-Plus (or profit is utilized By the module of similar functions in other process simulation software) be optimized calculating, obtain corrected after TBP distill data, Decision variable Data Comparison before and after correction is as shown in table 5.

Decision variable Data Comparison before and after table 5 correction

According to table 5, obtain comparison diagram before and after TBP curvature correction, as shown in Figure 2.TBP curve after corrected, more Press close to the former oil properties of current processing, be favorably improved the accuracy of atmospheric and vacuum distillation unit simulation, for follow-up device real-time optimization Lay the foundation.

Claims (5)

1. a true boiling point curve bearing calibration based on crude oil real-time, it is characterised in that the method includes following step Rapid:

1) near-infrared crude oil Fast Evaluation is utilized to obtain the current true boiling point distillation data processing crude oil；

2) utilize process simulation software, be simulated calculating according to the true boiling point distillation data of crude oil, obtain primary distillation tower and normal pressure The difference that each sideline product of tower is corresponding distillates the analogue value of a temperature；

3) measure difference corresponding to current primary distillation tower sideline product each with atmospheric tower and distillate the actual value of a temperature；

4) distillate the analogue value and the measured value of a temperature based on the difference that each sideline product of primary distillation tower and atmospheric tower is corresponding, utilize stream Journey simulation softward is fitted calculating, the true boiling point curve of crude oil after being corrected.

A kind of true boiling point curve bearing calibration based on crude oil real-time the most according to claim 1, its feature Be step 4) described in the Fitting Calculation: choose the primary distillation tower analogue value that distillate some temperature different with atmospheric tower sideline product and reality Measured value sum of square of deviations is minimum as optimization aim:

$J=min\[{\mathrm{\ω}}_k^i\underset{k=1}{\overset{5}{\Σ}}\underset{i=1}{\overset{5}{\Σ}}{(T_{S,k}^i-T_{T,k}^i)}^2\]$

Wherein,For step 2) in the calculated primary distillation tower of process simulation software and normal pressure The difference that each sideline product of tower is corresponding distillates the analogue value of a temperature,

The difference corresponding for each sideline product of primary distillation tower in actual condition and atmospheric tower evaporates Go out the measured value of a temperature,For weight,

Wherein subscript i represents primary distillation tower and the product of each side line of atmospheric tower, and subscript k represents primary distillation tower and each sideline product of atmospheric tower Difference distillate a little.

A kind of true boiling point curve bearing calibration based on crude oil real-time the most according to claim 2, its feature It is described the Fitting Calculation, uses following decision variable:

T={T₁,T₂,T₃,T₄,T₅}

Wherein, T_j(j=1,2 ..., 5) be respectively in current processing the true boiling point of crude oil distillation data 10%, 30%, 50%, 70%, The temperature that the fraction yield of 90% is corresponding.

A kind of true boiling point curve bearing calibration based on crude oil real-time the most according to claim 2, its feature It is each sideline product of described primary distillation tower and atmospheric tower to be respectively as follows: just to push up oil, often pushes up oil, normal line two wires oily, normal oil and often Third fractional oil, difference distillates and is a little respectively as follows: initial boiling point, 10% distillates point, 50% distillates point, 90% distillates a little and the end point of distillation.

A kind of true boiling point curve bearing calibration based on crude oil real-time the most according to claim 4, its feature It is that the difference of described primary distillation tower and each sideline product of atmospheric tower distillates a corresponding weight and distinguishes as follows:

${\mathrm{\ω}}^1=\{{\mathrm{\ω}}_1^1=3,{\mathrm{\ω}}_2^1=4,{\mathrm{\ω}}_3^1=4,{\mathrm{\ω}}_4^1=4,{\mathrm{\ω}}_5^1=10\}$

${\mathrm{\ω}}^2=\{{\mathrm{\ω}}_1^2=3,{\mathrm{\ω}}_2^2=5,{\mathrm{\ω}}_3^2=3,{\mathrm{\ω}}_4^2=7,{\mathrm{\ω}}_5^2=10\}$

${\mathrm{\ω}}^3=\{{\mathrm{\ω}}_1^3=2,{\mathrm{\ω}}_2^3=1,{\mathrm{\ω}}_3^3=1.6,{\mathrm{\ω}}_4^3=1,{\mathrm{\ω}}_5^3=0.6\}$

${\mathrm{\ω}}^4=\{{\mathrm{\ω}}_1^4=10,{\mathrm{\ω}}_2^4=5,{\mathrm{\ω}}_3^4=15,{\mathrm{\ω}}_4^4=15,{\mathrm{\ω}}_5^4=150\}$

${\mathrm{\ω}}^5=\{{\mathrm{\ω}}_1^5=2,{\mathrm{\ω}}_2^5=15,{\mathrm{\ω}}_3^5=15,{\mathrm{\ω}}_4^5=1.6,{\mathrm{\ω}}_5^5=15\}$

Wherein, ωⁱ(i=1,2 ..., 5) it is respectively and just pushes up oil, often push up each temperature that oil, a normal line, normal two wires and atmosphere 3rd side cut comprise The weight that point is corresponding.