CN101661533B - Predict method of procedure parameter in coke forming technology and device thereof - Google Patents
Predict method of procedure parameter in coke forming technology and device thereof Download PDFInfo
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Abstract
The invention discloses a predict method of procedure parameter in coke forming technology and a device thereof. The method comprises the steps of: detecting a coke forming switch event; initializing a real-time coke height value of a coke tower preparing for forming coke when the occurrence of the coke forming switch event is detected; judging whether the real-time coke height of the former measuring period is less than the transition height of the coke tower in each preset measuring period, and correspondingly ensuring the real-time coke height of the current measuring period according to a judging result; and predicting the procedure parameter in the coke forming technology of the coke tower in the current measuring period according to the judging result, and based on the ensured real-time coke height of the current measuring period and the desired coke forming period and/or the desired coke forming height of the coke tower. The method and the device can immediately predict the procedure parameter in coke forming technology in the process of delaying the coke forming.
Description
Technical Field
The invention relates to a delayed coking technology, in particular to a method and a device for predicting parameters of a green coke process.
Background
Since the development success of the delayed coking process in the 30 th century in 20 th century, the delayed coking process has become an important processing method for converting residual oil and increasing gasoline and diesel oil. In the process flow, the delayed coking device generally comprises a heating furnace and two or four coke drums, the radiation oil enters one coke drum to be coked to a certain height and then is switched to the other coke drum, the delayed coking process of the radiation oil is continuously operated for the heating furnace and a subsequent fractionation system, and the intermittent operations such as preparation and switching of a new drum, treatment and decoking of an old drum are carried out for the coke drum, so the delayed coking is a continuous and intermittent production process. The delayed coking process should operate as smoothly as possible to minimize fluctuations due to the periodic switching of coke drums.
In the delayed coking process, the coke height of the coke drum must be ensured within a reasonable range, so that the coke drum cannot be flushed due to the overhigh height (namely the coke height) of a carbon layer in the coke drum, and the utilization rate of the coke drum cannot be reduced due to the overlow coke height. Due to the high temperature and high pressure environment inside the coke drum, no measuring instrument can be used for directly detecting the focal height.
The coke height of the coke tower is generally obtained by manual measurement in a time interval after the raw coke of the coke tower is cooled and before decoking. The method is that neutron charge level meters are installed on a plurality of specific heights of the coke tower and used for monitoring the material state and the change of the material state on the corresponding height, the neutron charge level meters are radioactive detection meters, the principle that neutrons are scattered and moderated in a hydrogen-containing medium is utilized, the material in a device is judged to be in a gas phase, foam or liquid-solid phase, and quantitative data of the material density are given. An industrially experienced process engineer can generally estimate whether the coke in the coke drum has risen to some known fixed height during the coking process based on the density values monitored by the neutron level gauge. Essentially, the neutron level gauge does not measure the coke height, but rather detects the density of the green coke. The process engineer is too subjective and uncertain to estimate the density value as monitored by the neutron level gauge as being in focus.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a method and an apparatus for predicting parameters of a coking process, which can predict the parameters of the coking process in real time during a delayed coking process.
Therefore, the embodiment of the invention adopts the following technical scheme:
the embodiment of the invention provides a method for predicting parameters of a coke-forming process, which comprises the following steps:
detecting a coke formation switching event;
initializing the real-time coke height of a coke tower to be coked when a coke formation switching event is detected;
in each preset measurement period, judging whether the real-time coke height of the previous measurement period is smaller than the transition height of the coke tower, and correspondingly determining the real-time coke height of the current measurement period according to the judgment result;
and according to the judgment result, predicting the coking process parameters of the current measurement period of the coke tower according to the determined real-time coke height of the current measurement period and the expected coke forming period and/or the expected coke height of the coke tower.
The step of correspondingly determining the real-time focal height of the current measurement period according to the judgment result specifically comprises the following steps:
when the judgment result is yes, calculating the real-time focal height H of the current period according to the following formulai：
When the judgment result is negative, calculating the real-time focal height H of the current period according to the following formulai：
wherein Hi-1Is the real-time focal height of the previous measurement period; fRadiation oil, i-1The feed flow rate of the radiant oil in the previous measurement period of the coke drum; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofi-1Real-time height of focus H for previous measurement cyclei-1The diameter of the corresponding cross section; Δ t is the measurement period.
The determination method of the conversion rate parameter eta comprises the following steps:
determining a coke drum set-up factor Fact using off-line data based on a minimum sum of squares of differences between predicted final and assay values of the final and elevation1、Fact2(ii) a Obtaining a current correction factor Val and a raw oil density rhoRaw oil；
According to the formula eta (Val ×) (Fact)1×ρRaw materialsOil+Fact2) Calculating the conversion parameter η.
The method for determining the current correction factor Val comprises the following steps:
when the coke formation switching event is detected, the coke drum H is continuously judged to be positionedBWhether the signal value of the neutron level gauge at the height changes abruptly and, if so, the current value of the correction factor Val is calculated according to the formula:
otherwise, keeping the value of the correction factor Val as the value of the previous measurement cycle;
wherein HAAnd HBFor setting height of neutron level indicator, HA＜HB(ii) a ka is at HACounting the measuring period corresponding to the time when the signal value of the neutron level gauge at the height is suddenly changed; kb is at HBAnd counting the measuring period corresponding to the moment when the signal value of the neutron level gauge at the height is suddenly changed.
When the coking process parameter is the final coke height, calculating the coking process parameter of the coke drum in the current measurement period according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke drum according to the judgment result specifically comprises the following steps:
and when the judgment result is yes, calculating the final focal height corresponding to the current measurement period according to the following formula:
and when the judgment result is negative, calculating the final focal height corresponding to the current measurement period according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; fRadiation oil, iThe radiation oil feeding flow of the coke tower in the current measuring period is obtained; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; t iswillIs the desired coking cycle for the coke drum.
When the coking process parameter is the coking time remaining after the current measurement period, the calculating of the coking process parameter corresponding to the coke drum according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke drum specifically comprises:
when the judgment result is yes, calculating the remaining coke formation time according to the following formula:
when the judgment result is negative, calculating the remaining coke formation time according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; fRadiation oil, iThe radiation oil feeding flow of the coke tower in the current measuring period is obtained; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; hwillIs the desired coke height of the coke drum.
When the coking process parameter is the optimized value of the feed flow of the radiant oil in the current measurement period, the calculation of the coking process parameter corresponding to the coke drum according to the determined real-time coke height in the current measurement period and the expected coking period and/or the expected coke height of the coke drum specifically comprises the following steps:
when the judgment result is yes, calculating the optimized value of the feed flow of the radiant oil in the current measurement period according to the following formula:
and when the judgment result is negative, calculating the optimized value of the feed flow of the radiant oil in the current measurement period according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; hwillIs the desired coke height of the coke drum; t iswillIs the desired coking cycle for the coke drum.
The embodiment of the invention also provides a device for predicting the parameters of the coke-forming process, which comprises the following steps:
a detection unit for detecting a coke formation switching event;
the device comprises an initialization unit, a control unit and a control unit, wherein the initialization unit is used for initializing the real-time coke height of a coke tower to be coked when detecting that a coke-forming switching event occurs;
the judging unit is used for judging whether the real-time coke height of the previous measuring period is smaller than the transition height of the coke tower or not in each preset measuring period and correspondingly determining the real-time coke height of the current measuring period according to the judging result;
and the parameter prediction unit is used for predicting the coking process parameters of the current measurement period of the coke tower according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke tower.
Wherein, still include:
a conversion rate parameter determining unit for determining a device factor Fact of the coke drum using the off-line data according to a principle that a sum of squares of differences between the predicted final focal height and a laboratory analysis value of the focal height is minimized1、Fact2(ii) a Obtaining a current correction factor Val and a raw oil density rhoRaw oil(ii) a According to the formula eta (Val ×) (Fact)1×ρRaw material drawer+Fact2) And calculating the conversion rate parameter eta, and sending the conversion rate parameter eta to a judging unit and a parameter predicting unit.
A correction factor determining unit for continuously judging that the coke drum H is positioned when the coke formation switching event is detectedBWhether the signal value of the neutron level gauge at the height changes abruptly and, if so, the current value of the correction factor Val is calculated according to the formula:
if not, keeping the value of the correction factor Val as the value of the previous measuring period;
wherein i is 1, 2.. n; hAAnd HBFor setting height of neutron level indicator, HA＜HB(ii) a ka is at HACounting the measuring period corresponding to the time when the signal value of the neutron level indicator at the height is suddenly changed; kb is at HBCounting the measuring period corresponding to the time when the signal value of the neutron level meter changes suddenly.
The technical effect analysis of the technical scheme is as follows:
when the coke forming switching event is detected, in each preset measurement period, the size relationship between the real-time coke height of the previous measurement period and the transition height of the coke tower is judged, the real-time coke height of the current measurement period is determined, and each coke forming technological process parameter is correspondingly predicted according to the size relationship, so that the prediction of each coke forming technological process parameter in the coke forming process is realized.
Drawings
FIG. 1 is a schematic flow chart of a method for predicting parameters of a coke-forming process according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for predicting a final focal height according to an embodiment of the present invention;
FIG. 3 is an exemplary illustration of a coke drum configuration according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a device for predicting parameters of a coke-forming process according to an embodiment of the present invention.
Detailed Description
While an industry experienced process engineer may generally estimate the coke height based on the material density value monitored by the neutron level gauge, such an estimation is merely a determination of whether the coke has risen to some known fixed height. Neither accurate quantitative guidance of production nor optimal control is possible due to being overly subjective and with uncertainty.
Therefore, the embodiment of the invention provides a coke height measuring method, which can predict the final coke height of a coke tower in real time according to the inherent parameters of the coke tower, such as the prediction period, the feed flow rate of the radiation oil, the density constant of the coke, the density of the raw oil and the like, and can predict the coke forming residual time and the current feed flow rate optimization value of the radiation oil in real time, thereby performing optimization control on the delayed coke forming process.
The implementation of the method and the device for predicting the parameters of the coke-producing process according to the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a schematic flow chart of a method for predicting parameters of a coke-producing process according to an embodiment of the present invention is shown in fig. 1, and includes:
step 101: and detecting a coke formation switching event, and initializing the real-time coke height of the coke tower to be coked when the coke formation switching event is detected.
The detecting of the coke formation switching event may specifically be: reading the bottom temperature of each coke tower, and when the bottom temperature of a certain coke tower exceeds a preset temperature threshold value, such as 400 ℃, determining that the coke tower starts to coke; when the temperature of the bottom of the coke tower is lower than the preset temperature threshold, the coke formation of the coke tower is finished, a coke formation switching event occurs, and the coke tower is switched to another coke tower to start a delayed coke formation process.
The initialization value for the real-time coke level is typically 0, since the coke drum is still only in preparation for coking when a coke make switch event is typically detected.
Step 102: and in each preset measurement period, judging whether the real-time coke height of the previous measurement period is smaller than the transition height of the coke tower, and correspondingly determining the real-time coke height of the current measurement period according to the judgment result.
Step 103: and according to the judgment result, calculating the coking process parameters of the current measurement period of the coke tower according to the determined real-time coke height of the current measurement period and the expected coke forming period and/or the expected coke height of the coke tower.
In the embodiment of the invention shown in fig. 1, when the occurrence of a coke formation switching event is detected, in each preset measurement period, the size relationship between the real-time coke height of the previous measurement period and the transition height of the coke drum is judged, the real-time coke height of the current measurement period is determined, and each coke formation process parameter is preset correspondingly according to the size relationship, so that the prediction of each coke formation process parameter in the coke formation process is realized.
Wherein, the coke-forming technological process parameters can comprise: the final coke height corresponding to the current measurement period, the coke forming time left after the current measurement period and the optimized value of the feed flow of the radiant oil.
Example 1
As shown in fig. 2, a flow chart of the method for predicting the final focal height includes:
step 201: and detecting a coke formation switching event, and initializing a real-time coke height value of a coke tower for coke formation when the coke formation switching event is detected.
Step 202: in each preset measuring period, judging whether the real-time coke height of the previous measuring period is smaller than the transition height of the coke tower, if so, executing a step 203; otherwise, step 205 is performed.
Here, the specific time length of the measurement period Δ t is not limited here, and may be set to, for example: Δ t (1/60) hours, and the like.
As shown in FIG. 3, in practical applications, each coke drum is between 0 and H*The height is changed into a cylindrical shape from a truncated cone shape or a truncated cone (the truncated cone is taken as an example in the embodiment of the invention), and the like, so that the height H is changed here*Referred to as the transition height of the coke drum. The diameters of the upper bottom and the lower bottom of the circular truncated cone are D and D respectively, and the D is also the maximum diameter of the cross section of the coke tower.
Step 203: real-time focal height H from the previous measurement periodi-1Feeding flow F of coke tower radiation oil in the previous measuring periodRadiation oil, i-1Coke density in coke drumDegree constant rhoCokeConversion parameter eta, maximum diameter D of coke drum cross section, real-time height H of coke drum in previous measurement cyclei-1Diameter x of the corresponding cross sectioni-1And the measurement period deltat predicts the real-time focal height of the current measurement period, after which step 204 is performed.
Specifically, the real-time focal height of the current measurement period can be predicted by using the following formula (1):
wherein Hi-1Is the real-time focal height of the previous measurement period; fRadiation oil, i-1The feeding flow of the coke tower radiation oil in the previous measurement period; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofi-1Real-time height of focus H for previous measurement cyclei-1The diameter of the corresponding cross section; Δ t is the measurement period.
Density constant for coke ρCoke：
Density constant rho of coke corresponding to each coke drumCokeGenerally, the value is a fixed value and does not change along with the process of coke formation.
Diameter x for cross sectioni：
Real-time focal height H of ith measurement cycleiDiameter x of the corresponding cross sectioniThe calculation of (d) may be: <math><mrow><msub><mi>x</mi><mi>i</mi></msub><mo>=</mo><mfrac><mrow><msub><mi>H</mi><mi>i</mi></msub><mo>×</mo><mrow><mo>(</mo><mi>D</mi><mo>-</mo><mi>d</mi><mo>)</mo></mrow></mrow><msup><mi>H</mi><mo>*</mo></msup></mfrac><mo>+</mo><mi>d</mi><mo>,</mo></mrow></math> (i＝0，1，2，...，n)。
for the conversion parameter η:
conversion parameter eta and density rho of raw oil in coke towerRaw oilIt is related. Specifically, the conversion parameter η may be calculated as:
η＝Val×(Fact1×ρraw oil+Fact2) (2)
Wherein, Fact1And Fact2Specifically, the off-line data may be used to obtain the installation factor Fact of the coke drum by first setting Val to 1 and then performing regression according to the expression (2) of the formula (5) and η according to the principle that the sum of squares of the differences between the laboratory analysis values for predicting the final coke height and the coke height is the minimum1And Fact2(ii) a Val is the correction factor.
Thus, the determination of the conversion parameter η may be:
determining a coke drum set-up factor Fact using off-line data based on a minimum sum of squares of differences between predicted final and assay values of the final and elevation1、Fact2；
Obtaining a current correction factor Val and a raw oil density rhoRaw oil；
According to the formula eta (Val ×) (Fact)1×ρRaw oil+Fact2) Calculating the conversion parameter η.
For stock oil density ρRaw oil: this value is generally a determinable value and may be stored in a fixed memory location, and when the above-mentioned determination of the conversion parameter η is performed, the parameter is directly obtained from the corresponding memory location.
For the correction factor Val in the conversion parameter η:
the correction factor Val may be stored in a fixed memory location and initialized to 1 when the coke drum first begins to make predictive calculations.
When the coke tower is not provided with a neutron material level meter, the correction factor Val is always set to be 1;
when the coke drum is set to neutron level timing, the value of the correction factor Val can be divided into two phases: an initial phase and a correction phase. Wherein, the initial stage refers to the time from the beginning of coke formation to the time when the signal value of the neutron level gauge changes suddenly, and at this time, the value is maintained as the value in the previous measurement period, wherein, when a certain coke drum starts a new coke formation process, the Val value in the first measurement period is the Val value in the last measurement period in the previous coke formation period (the coke formation period refers to the time when the coke drum completes one coke formation process), that is: the Val value at the end of the previous coking period of a certain coke tower can be continuously used when the next coking period begins; in the correction stage, when the neutron level indicator detects that the signal has mutation, a correction factor Val can be obtained through calculation of the installation height of the neutron level indicator, the mutation time and the like, and is used for correcting the real-time focal height value predicted by the subsequent measurement period.
The calculation of the correction factor Val for setting the neutron level timing for a coke drum is exemplified by the following:
as shown in FIG. 3, the neutron level gauge is installed at the coke drum height HAAnd HBA is prepared fromA＜HB. When a certain coke tower is coked, the signal values of the neutron charge level indicators A and B are subjected to sudden change successively. According to the actual situation, the judgment of the mutation can be according to the following rules: when the signal value of the neutron level gauge is greater than a predetermined value, for example, 30, for the first time, a sudden change is considered to have occurred. In the case of the two neutron level gauges shown in fig. 3, when the signal value of the neutron level gauge B changes abruptly, the correction phase of the correction factor Val is shifted to until the coking process in the coke drum is finished. The calculation of the correction factor Val in the correction phase may be:
assuming that the coke height at the end of coke formation satisfies Hi＝n≥HBThe signal value of the neutron level gauge A is suddenly changed in the ka measurement period after coke is generated, and the feed flow of the radiant oil is FIrradiated oil, ka(ii) a The B signal value of the neutron level indicator is mutated in the kb measuring period after coking, and the feed flow of the radiant oil is FIrradiated oil, kbAnd after the radiation oil feed flow signal value is mutated, the value of the correction factor Val is as follows:
as can be seen from the formula (3), the correction factor Val reflects the H estimated by the neutron level gaugeAAnd HBThe ratio of the intermediate coking rate to the coking rate predicted after coking of the radiant oil according to the conversion parameter η is identical when Val is 1. The correction factor Val represents factors which cannot be detected under the process conditions and influence the coking rate, accordingly, the Val value obtained by calculation of the previous coking cycle can be used for correcting the Val value of the next coking cycle, and the correction function is to eliminate the influence of the factors which cannot be detected on the real-time coking height value prediction.
Thus, in the initial stage, the correction factor Val is 1, and the conversion parameter η is the determined device factor Fact corresponding to the current feed oil density1And Fact2A constant of interest; after the neutron level indicator generates signal mutation and is switched into a correction stage, a correction factor Val is calculated according to the numerical value recorded by the neutron level indicator and other operation parameters, and then a conversion rate parameter eta is calculated, and then the real-time focal height is calculated according to the conversion rate parameter eta in each subsequent measurement period, so that the effect of reducing the influence of other non-measurable factors on the coking rate is achieved.
Step 204: and predicting the final coke height of the coke tower corresponding to the current measurement period according to the determined real-time coke height of the current measurement period and the expected coke-forming period of the coke tower.
The delayed coking cycle is determined by the capacity of the coke drums themselves and the schedule, which refers to the time interval between the commencement of coking by one coke drum switching to the commencement of coking by another coke drum.When the final coke height corresponding to the current measurement period of the coke drum is predicted, the coke drum is utilized to expect a green coke period Twill(hours) combined with the current real-time calculated focal height value Hi(m) (i ═ 1, 2.., n), predicting the final height of coke H after the expected coking cycle for that secondary cokefinal，i(rice).
Specifically, the final focal height may be predicted using equation (4):
step 205: real-time focal height H from the previous measurement periodi-1Feeding flow F of coke tower radiation oil in the previous measuring periodRadiation oil, i-1Density constant rho of coke in coke drumCokeThe conversion parameter η, the maximum diameter D of the coke drum cross section, and the measurement period Δ t predict the real-time focal height for the current measurement period, after which step 206 is performed.
Specifically, the real-time focal height can be predicted using equation (5):
step 206: and predicting the final coke height of the coke tower corresponding to the current measurement period according to the determined real-time coke height of the current measurement period and the expected coke-forming period of the coke tower.
Specifically, the final focal height may be predicted using the following formula (6):
FIG. 2 shows an embodiment of the inventionE.g., real-time coke height based on the current measurement period and the desired coke formation period T for the coke drumwillThe final coke height of the coke tower corresponding to the current measurement period is predicted; in the prediction process, the final coke height is predicted according to the inherent parameters of the coke drum, such as the prediction period, the feed flow rate of the radiant oil, the density constant of the coke, the density of the raw oil and the like, so that the prediction value is accurate.
Example 2
The method for predicting the remaining char formation time after the current measurement period is similar to the method flow shown in fig. 2; however, in contrast to the prediction of the final focal height shown in FIG. 2, in the present embodiment, the desired focal height H is combined with various parameters according to the predicted real-time focal heightwillAnd predicting the residual coking time. The main differences from the embodiment shown in fig. 2 are:
according to the expected focal height H in step 204willCombined with real-time focal height H of the current measurement cyclei(i ═ 1, 2.. times, n), predicting the coke formation time T remaining after the current measurement periodremain，i。
When the remaining coking time is predicted in step 206, the prediction formula may be:
embodiments of the present invention provide real-time coke height based on current measurement cycle and coke drum expected coke height HwillThe more accurate prediction of the residual coking time after the current measurement period is realized; in the prediction process, coke is predicted according to the prediction period, the feed rate of the radiation oil, the density constant of coke, the density of the raw oil, and the likeThe residual coking time is predicted by the inherent parameters of the tower, so that the predicted value is more accurate.
Example 3
The flow diagram of the method for predicting the optimized value of the feed flow of the radiant oil is similar to that of the prediction method shown in FIG. 2, but compared with the prediction of the final focal height shown in FIG. 2, in the embodiment, the desired focal height H is combined with various parameters according to the predicted real-time focal heightwillAnd the expected coke formation period TwillAnd predicting the residual coking time. The main differences from the embodiment shown in fig. 2 are:
the coke drum desired coking period T described in step 204willAnd a desired focal height HwillCombined with real-time focal height H of the current measurement cyclei(i ═ 1, 2.. times, n), predicting the radiant oil feed flow optimization guidance value F corresponding to the current measurement periodopt，i。
The optimized value F of the feed flow of the radiant oil corresponding to the current measurement period in step 206opt，iThe prediction formula of (c) is:
the embodiment of the invention obtains the real-time coke height and the expected coke height H of the coke tower according to the current measurement periodwillAnd expected coke formation period TwillAnd the more accurate prediction of the optimized value of the feed flow of the radiant oil in the current measurement period is realized.
On the basis of the coke-forming technological process parameter prediction method, the embodiment of the invention also provides a corresponding coke-forming technological process parameter prediction device.
Fig. 4 is a schematic structural diagram of the device, which includes:
a detection unit 410 for detecting a coke formation switching event;
an initialization unit 420, configured to initialize a real-time coke height value of a coke drum to be coked when detecting that a coke-forming switching event occurs;
a determining unit 430, configured to determine, in each preset measurement period, whether the real-time coke height of the previous measurement period is smaller than the transition height of the coke drum, and correspondingly determine the real-time coke height of the current measurement period according to a determination result;
and a parameter prediction unit 440, configured to predict the coking process parameters of the coke drum in the current measurement period according to the determined real-time coke height of the current measurement period and the expected coke formation period and/or the expected coke height of the coke drum.
Preferably, as shown in fig. 4, the apparatus may further include:
a conversion rate parameter determining unit 450 for determining a device factor Fact of the coke drum using the off-line data according to a rule that a sum of squares of differences between the predicted final focal height and the assay analysis of the focal height is minimized1、Fact2(ii) a Obtaining a current correction factor Val and a raw oil density rhoRaw oil(ii) a According to the formula eta (Val ×) (Fact)1×ρRaw oil+Fact2) The conversion rate parameter η is calculated and sent to the determining unit 430 and the parameter predicting unit 440.
The apparatus may further include: a correction factor determining unit 460 for continuously determining the coke drum height H when the occurrence of coke formation switching event is detectedBWhether the signal value of the neutron level gauge has a sudden change,
if so, according to the formula
Calculating the current value of the correction factor Val: if not, keeping the value of the correction factor Val as the value in the previous prediction period;
wherein HAAnd HBFor setting height of neutron level indicator, HA＜HB(ii) a ka is at HACounting the measurement period corresponding to the time when the signal value of the h neutron level indicator changes suddenly; kb is at HBCounting the measuring period corresponding to the time when the signal value of the neutron level meter changes suddenly.
In the prediction apparatus shown in fig. 4 according to the embodiment of the present invention, when the detection unit detects that a coke formation switching event occurs, in each preset measurement period, the determination unit determines the magnitude relationship between the real-time coke height of the previous measurement period and the transition height of the coke drum, and determines the real-time coke height of the current measurement period, and the parameter prediction unit correspondingly presets various coke formation process parameters according to the magnitude relationship, so that the prediction of the final coke height corresponding to the current measurement period, the coke formation time remaining after the current measurement period, the radiation oil feeding flow optimization value, and other coke formation process parameters in the coke formation process is realized; in the prediction process, the residual coking time is predicted according to the inherent parameters of the coke drum, such as the prediction period, the feed flow rate of the radiant oil, the density constant of the coke, the density of the raw oil and the like, so that the prediction value is accurate.
It can be understood by those skilled in the art that the processes for implementing the method for predicting parameters of a coking process according to the above embodiment can be implemented by hardware associated with instructions of a program, and the program can be stored in a readable storage medium, and when executed, the program performs the corresponding steps in the above method. The storage medium may be as follows: ROM/RAM, magnetic disk, optical disk, etc.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A method for predicting parameters of a coke-forming process is characterized by comprising the following steps:
detecting a coke formation switching event;
initializing the real-time coke height of a coke tower to be coked when a coke formation switching event is detected;
in each preset measurement period, judging whether the real-time coke height of the previous measurement period is smaller than the transition height of the coke tower, and correspondingly determining the real-time coke height of the current measurement period according to the judgment result;
predicting the coking process parameters of the current measurement period of the coke tower according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke tower;
the step of correspondingly determining the real-time focal height of the current measurement period according to the judgment result specifically comprises the following steps:
when the judgment result is yes, calculating the real-time focal height H of the current period according to the following formulai：
When the judgment result is negative, calculating the real-time focal height H of the current period according to the following formulai：
wherein Hi-1Is the real-time focal height of the previous measurement period; fRadiation oil, i-1The feed flow rate of the radiant oil in the previous measurement period of the coke drum; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofi-1Real-time height of focus H for previous measurement cyclei-1The diameter of the corresponding cross section; Δ t is the measurement period;
the determination method of the conversion rate parameter eta comprises the following steps:
determining a coke drum set-up factor Fact using off-line data based on a minimum sum of squares of differences between predicted final and assay values of the final and elevation1、Fact2(ii) a Obtaining a current correction factor Val and a raw oil density rhoRaw oil；
According to the formula eta (Val ×) (Fact)1×ρRaw oil+Fact2) Calculating the conversion parameter;
the method for determining the current correction factor Val comprises the following steps:
upon detection of occurrence of coke formation switching eventContinuously judging that the coke drum is positioned in the coke drum HBWhether the signal value of the neutron level gauge at the height changes abruptly and, if so, the current value of the correction factor Val is calculated according to the formula:
otherwise, keeping the value of the correction factor Val as the value of the previous measurement cycle;
wherein HAAnd HBFor setting height of neutron level indicator, HA＜HB(ii) a ka is at HACounting the measuring period corresponding to the time when the signal value of the neutron level gauge at the height is suddenly changed; kb is at HBCounting the measuring period corresponding to the time when the signal value of the neutron level gauge at the height is suddenly changed;
when the coking process parameter is the final coke height, calculating the coking process parameter of the coke drum in the current measurement period according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke drum according to the judgment result specifically comprises the following steps:
and when the judgment result is yes, calculating the final focal height corresponding to the current measurement period according to the following formula:
and when the judgment result is negative, calculating the final focal height corresponding to the current measurement period according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; fRadiation oil, iThe radiation oil feeding flow of the coke tower in the current measuring period is obtained; rhoCokeIs the density of coke in the coke drumCounting; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; t iswillA desired coking cycle for the coke drum;
when the coking process parameter is the coking time remaining after the current measurement period, the calculating of the coking process parameter corresponding to the coke drum according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke drum specifically comprises:
when the judgment result is yes, calculating the remaining coke formation time according to the following formula:
when the judgment result is negative, calculating the remaining coke formation time according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; fRadiation oil, iThe radiation oil feeding flow of the coke tower in the current measuring period is obtained; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; hwillIs the desired coke height of the coke drum;
when the coking process parameter is the optimized value of the feed flow of the radiant oil in the current measurement period, the calculation of the coking process parameter corresponding to the coke drum according to the determined real-time coke height in the current measurement period and the expected coking period and/or the expected coke height of the coke drum specifically comprises the following steps:
when the judgment result is yes, calculating the optimized value of the feed flow of the radiant oil in the current measurement period according to the following formula:
and when the judgment result is negative, calculating the optimized value of the feed flow of the radiant oil in the current measurement period according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; hwillIs the desired coke height of the coke drum; t iswillIs the desired coking cycle for the coke drum.
2. A device for predicting parameters of a coke-forming process is characterized by comprising:
a detection unit for detecting a coke formation switching event;
the device comprises an initialization unit, a control unit and a control unit, wherein the initialization unit is used for initializing the real-time coke height of a coke tower to be coked when detecting that a coke-forming switching event occurs;
the judging unit is used for judging whether the real-time coke height of the previous measuring period is smaller than the transition height of the coke tower or not in each preset measuring period and correspondingly determining the real-time coke height of the current measuring period according to the judging result; the step of correspondingly determining the real-time focal height of the current measurement period according to the judgment result specifically comprises the following steps:
when the judgment result is yes, calculating the real-time focal height H of the current period according to the following formulai：
When the judgment result is negative, calculating the real-time focal height H of the current period according to the following formulai：
wherein Hi-1Is the real-time focal height of the previous measurement period; fRadiation oil, i-1The feed flow rate of the radiant oil in the previous measurement period of the coke drum; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofi-1Real-time height of focus H for previous measurement cyclei-1The diameter of the corresponding cross section; Δ t is the measurement period;
the determination method of the conversion rate parameter eta comprises the following steps:
determining a coke drum set-up factor Fact using off-line data based on a minimum sum of squares of differences between predicted final and assay values of the final and elevation1、Fact2(ii) a Obtaining a current correction factor Val and a raw oil density rhoRaw oil；
According to the formula eta (Val ×) (Fact)1×ρRaw oil+Fact2) Calculating the conversion parameter;
the method for determining the current correction factor Val comprises the following steps:
when the coke formation switching event is detected, the coke drum H is continuously judged to be positionedBWhether the signal value of the neutron level gauge at the height changes abruptly and, if so, the current value of the correction factor Val is calculated according to the formula:
otherwise, keeping the value of the correction factor Val as the value of the previous measurement cycle;
wherein HAAnd HBFor setting height of neutron level indicator, HA＜HB(ii) a ka is at HACounting the measuring period corresponding to the time when the signal value of the neutron level gauge at the height is suddenly changed; kb is at HBCounting the measuring period corresponding to the time when the signal value of the neutron level gauge at the height is suddenly changed;
the parameter prediction unit is used for predicting the coking process parameters of the current measurement period of the coke tower according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke tower; wherein,
when the coking process parameter is the final coke height, calculating the coking process parameter of the coke drum in the current measurement period according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke drum according to the judgment result specifically comprises the following steps:
and when the judgment result is yes, calculating the final focal height corresponding to the current measurement period according to the following formula:
and when the judgment result is negative, calculating the final focal height corresponding to the current measurement period according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; fRadiation oil, iThe radiation oil feeding flow of the coke tower in the current measuring period is obtained; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; t iswillA desired coking cycle for the coke drum;
when the coking process parameter is the coking time remaining after the current measurement period, the calculating of the coking process parameter corresponding to the coke drum according to the determined real-time coke height of the current measurement period and the expected coking period and/or the expected coke height of the coke drum specifically comprises:
when the judgment result is yes, calculating the remaining coke formation time according to the following formula:
when the judgment result is negative, calculating the remaining coke formation time according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; fRadiation oil, iThe radiation oil feeding flow of the coke tower in the current measuring period is obtained; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; hwillIs the desired coke height of the coke drum;
when the coking process parameter is the optimized value of the feed flow of the radiant oil in the current measurement period, the calculation of the coking process parameter corresponding to the coke drum according to the determined real-time coke height in the current measurement period and the expected coking period and/or the expected coke height of the coke drum specifically comprises the following steps:
when the judgment result is yes, calculating the optimized value of the feed flow of the radiant oil in the current measurement period according to the following formula:
and when the judgment result is negative, calculating the optimized value of the feed flow of the radiant oil in the current measurement period according to the following formula:
wherein i is 1, 2.. n; hiThe real-time focal height of the current measurement period; rhoCokeIs the density constant of the coke in the coke drum; eta is a conversion rate parameter; d is the maximum diameter of the cross section of the coke drum; x is the number ofiReal-time height of focus H for previous measurement cycleiThe diameter of the corresponding cross section; Δ t is the measurement period; hwillIs the desired coke height of the coke drum; t iswillIs the desired coking cycle for the coke drum.
3. The apparatus of claim 2, further comprising:
a conversion rate parameter determining unit for determining a device factor Fact of the coke drum using the off-line data according to a principle that a sum of squares of differences between the predicted final focal height and a laboratory analysis value of the focal height is minimized1、Fact2(ii) a Obtaining a current correction factor Val and a raw oil density rhoRaw oil(ii) a According to the formula eta (Val ×) (Fact)1×ρRaw oil+Fact2) Calculating the conversion rate parameter eta, and sending the conversion rate parameter eta to a judging unit and a parameter predicting unit;
further comprising: a correction factor determining unit for continuously judging that the coke drum H is positioned when the coke formation switching event is detectedBWhether the signal value of the neutron level gauge at the height changes abruptly and, if so, the current value of the correction factor Val is calculated according to the formula:
if not, keeping the value of the correction factor Val as the value of the previous measuring period;
wherein i is 1, 2.. n; hAAnd HBIs a neutron materialSetting height of the level gauge, HA＜HB(ii) a ka is at HACounting the measuring period corresponding to the time when the signal value of the neutron level indicator at the height is suddenly changed; kb is at HBCounting the measuring period corresponding to the time when the signal value of the neutron level meter changes suddenly; d is the maximum diameter of the coke drum cross section.
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