CN110244794B - Management and control method for oil field heating furnace - Google Patents
Management and control method for oil field heating furnace Download PDFInfo
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- CN110244794B CN110244794B CN201910530291.8A CN201910530291A CN110244794B CN 110244794 B CN110244794 B CN 110244794B CN 201910530291 A CN201910530291 A CN 201910530291A CN 110244794 B CN110244794 B CN 110244794B
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
Abstract
The invention discloses a management and control method for an oil field heating furnace. The method is used for an oil gas gathering and transportation system, medium outlets of a plurality of heating furnaces in the system are connected to a production area, and production index temperature is determined by the plurality of heating furnaces. The method comprises the following steps: comparing the production index temperature with a preset target interval; and according to the distance between the production index temperature and the target interval, performing quick adjustment or slow adjustment or buffer adjustment on the plurality of heating furnaces. The method can accurately select a proper mode from a plurality of adjusting modes to adjust the temperature of the heating furnace, and can safely, quickly and accurately reach the production target; the intelligent degree and the automation degree of the whole system are improved on the one hand, and on the other hand, the labor cost can be reduced, and the stability and the reliability of the system are improved.
Description
Technical Field
The invention relates to the technical field of oil field heating furnaces, in particular to a management and control method for an oil field heating furnace.
Background
The oil field heating furnace is a special equipment for oil field which is most applied in the links of processing, conveying and the like in an oil gas gathering and transferring system, has the function of heating crude oil, natural gas, oil gas mixture and the like to the temperature required by the process, meets the requirements of the oil gas gathering and transferring process and the processing process, and is an important oil field production facility. With the increase of the exploration and development area and the increase of the development difficulty of the oil and gas field, the number of the heating furnaces for the oil field is more and more. Heating furnaces used by domestic oil field stations are different in types and times, so that the heat efficiency of different heating furnaces is not balanced, and on the other hand, the medium flow of different heating furnaces in production and operation is different, so that the utilization capacity of fuel gas is greatly different. At present, domestic oil field enterprises generally adopt an artificial on-duty mode to control a heating furnace, on one hand, a large amount of human input is needed, and on the other hand, the heating furnace cannot be accurately controlled so that large energy waste exists. With the development of technology, oil field enterprises prefer to adopt some advanced algorithms and automatically realize energy-saving management and control of heating furnaces by using software programs.
Disclosure of Invention
The embodiment of the invention aims to provide a centralized energy-saving management and control method for an oil field heating furnace, which can improve the intelligent and automatic degree of the whole system, reduce the labor cost and improve the stability and reliability of the system.
The technical scheme is as follows: a control method for oil field heating furnaces is characterized in that medium outlets of a plurality of heating furnaces are connected to a production area, and production index temperature is determined by the plurality of heating furnaces; the method comprises the following steps: comparing the production index temperature with a preset target interval; according to the distance between the production index temperature and the target interval, performing rapid adjustment or slow adjustment or buffer adjustment on the plurality of heating furnaces; in the step of adjusting the buffer section, the heating furnace is subjected to fire lifting or fire reducing or the current situation is maintained according to the variation trend of the temperature of the production index.
Optionally, when the production index temperature falls outside the target interval and the temperature difference is greater than a first set value, performing rapid adjustment; when the production index temperature falls outside the target interval and the temperature difference value is between the first set value and the second set value, performing slow adjustment; when the temperature difference is smaller than or equal to a second set value, the production index temperature enters a production index buffer area, and the buffer section is adjusted according to the variation trend of the production index temperature; the temperature difference is the difference between the production index temperature and the end point of the adjacent target interval, and the second set value is smaller than the first set value.
Optionally, the fast adjusting step includes: estimating the required ignition/ignition reduction times according to the temperature difference; distributing the estimated ignition/ignition reduction times to at least two heating furnaces; carrying out fire lifting/fire lowering on the at least two heating furnaces according to the distributed fire lifting/fire lowering times; waiting a time interval after the fire is initiated/reduced.
Optionally, the slow adjusting step includes: selecting a heating furnace, and carrying out primary fire lifting/fire lowering on the heating furnace; waiting a time interval after the fire is initiated/reduced.
Optionally, the buffer adjusting step includes: calculating the variation trend of the production index temperature within a certain time; if the change trend is close to the center of the target interval, maintaining the current situation; if the variation trend is far away from the center of the target interval, selecting a heating furnace, and carrying out primary ignition/ignition reduction on the heating furnace to enable the production index temperature to approach the center of the target interval.
Optionally, the method further includes: presetting a reasonable interval aiming at the temperature of the heating furnace, and respectively presetting an upper edge buffer zone and a lower edge buffer zone at the upper edge and the lower edge of the reasonable interval; judging whether the temperature of each heating furnace falls between a lower edge buffer area and an upper edge buffer area in a reasonable interval, and if so, starting a temperature supporting pipe of the heating furnace; the heating furnace temperature hosting comprises: when the temperature of the heating furnace falls into the lower edge buffer zone or the upper edge buffer zone, calculating the change trend of the temperature of the heating furnace within a certain time; if the change trend is close to the center of the reasonable interval, the current situation is maintained; if the variation trend is far away from the center of the reasonable interval, the heating furnace is subjected to primary ignition/ignition reduction, so that the temperature of the heating furnace is close to the center of the reasonable interval.
Optionally, the method further includes: calculating the energy utilization rate of each heating furnace; carry out primary temperature control according to energy utilization ratio, include: and (4) carrying out fire raising once on the heating furnace with the highest energy utilization rate, and carrying out fire lowering once on the heating furnace with the lowest energy utilization rate.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. by comparing the production index temperature with a preset target interval, the temperature of the heating furnace is adjusted by accurately selecting a proper mode from multiple adjusting modes, so that the production target can be safely, quickly and accurately achieved;
2. in some implementation modes, the energy-saving heating furnace can be further adjusted according to the energy utilization rate of the heating furnace, and the combustion of the heating furnace is macroscopically allocated, so that the energy-saving effect is achieved;
3. in some implementation modes, the temperature of the heating furnace is preset to be within a reasonable range, a corresponding buffer area and corresponding automatic control are carried out, and the production target can be kept stable at any time along with the change of environment and medium.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for managing an oilfield heating furnace according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a temperature hosting process in one embodiment of the invention;
FIG. 3 is a diagram illustrating an energy conservation management and control flow according to an embodiment of the present invention;
FIG. 4-1 is a schematic diagram illustrating the effect of not implementing energy saving regulation in one embodiment of the present invention;
fig. 4-2 is a schematic diagram of the effect of implementing energy saving adjustment in one embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The following are detailed descriptions of the respective embodiments.
Referring to fig. 1, an embodiment of the present invention provides a management and control method for an oil field heating furnace, which can be used in an oil and gas gathering and transportation system to implement automatic centralized/energy-saving management and control of the oil field heating furnace. In general, in an oil and gas gathering and transportation system, medium outlets of a plurality of heating furnaces are connected to the same production area, and the temperature of a medium in the production area is called production index temperature which is determined by the plurality of heating furnaces. The temperature of any one heating furnace is adjusted to influence the production index temperature. Generally, the operation of raising the temperature of the heating furnace may be referred to as a fire raising, i.e., raising the fire gear; the operation of lowering the temperature of the heating furnace is called fire lowering, namely, lowering the fire gear; raising one gear is called as boosting once, and lowering one gear is called as lowering once. It should be noted that the heating furnace temperature refers to the furnace body temperature of the heating furnace, the production index temperature refers to the temperature of the medium in the production zone, and the medium temperature at the outlet of the heating furnace is referred to as the outlet temperature of the heating furnace. The furnace temperature, the outlet temperature, and the production target temperature are typically not uniform.
Referring to fig. 1, the management and control method may include:
11. comparing the production index temperature with a preset target interval;
12. and according to the distance between the production index temperature and the target interval, performing quick adjustment or slow adjustment or buffer adjustment on the plurality of heating furnaces.
The method comprises a rapid adjusting step, a slow adjusting step and a buffer section adjusting step, wherein in the rapid adjusting step, at least two heating furnaces are subjected to fire raising or fire reducing once, in the slow adjusting step, one heating furnace is subjected to fire raising or fire reducing once, and in the buffer section adjusting step, one heating furnace is subjected to fire raising or fire reducing once or the current situation is maintained according to the variation trend of the temperature of a production index.
In the following, three adjustment modes are further detailed:
(I) fast adjustment
In this embodiment, when the production index temperature falls outside the target interval and the temperature difference is greater than the first set value, the rapid adjustment is performed.
The temperature difference is the difference between the production index temperature and the end point of the adjacent target interval. The endpoints include a lower edge and an upper edge of the target interval. Assuming a target interval of [50, 70] in degrees celsius, the target interval includes two endpoints, a lower edge of 50 degrees celsius and an upper edge of 70 degrees celsius, respectively. If the first set value is set to 3 degrees centigrade, the production index temperature is lower than 47 degrees centigrade or higher than 73 degrees centigrade, and the rapid adjustment is performed.
Taking the fire as an example, in some embodiments, the initial production indicator temperature is lower than the lower edge of the target interval, and the fast adjusting function is to determine the difference between the production indicator temperature and the lower edge of the target interval, and if the difference is larger, for example, reaches 3 ℃ (the first set value, which is configurable), then the fast fire is performed.
Similarly, in some embodiments, if the production indicator temperature is higher than the upper edge of the target interval, the fast adjustment function is to determine the difference between the production indicator temperature and the upper edge of the target interval, and if the difference is larger, for example, reaches 3 ℃ (the first set value, which is configurable), the fast adjustment function is to perform fast fire reduction.
In some embodiments, the steps of rapidly adjusting are as follows:
(1) and estimating the required ignition/ignition reduction times according to the temperature difference.
Taking a fire as an example, in some embodiments, the estimation is as follows:
based on the situation of a user site, according to the change value (which can be inquired from historical data) of the production index temperature when any heating furnace is ignited once, taking the maximum change value;
then calculated according to the following formula: the maximum change value of the temperature difference/fire lifting is equal to the fire lifting times.
The formula is replaced by the following formula in the same way of reducing fire: the maximum variation value of the temperature difference/one-time fire reduction is the fire reduction times.
(2) And distributing the estimated ignition/ignition reduction times to at least two heating furnaces.
Preferably, a heating furnace meeting the conditions is selected. In some embodiments, the selection conditions are as follows:
firstly, the heating furnace conforms to intelligent control configuration;
secondly, the temperature of the heating furnace is in a buffer area;
and thirdly, sorting according to the difference between the temperature of the heating furnace and the temperature of the outlet of the heating furnace (for example, the temperature is small to large).
Secondly, the ignition/ignition reduction times calculated in the previous step are distributed according to a certain strategy, and can be distributed to all qualified heating furnaces or only a part of the heating furnaces, and how to distribute the heating/ignition reduction times is not limited in the text, but the heating/ignition reduction times are generally distributed to at least two heating furnaces so as to realize rapid temperature regulation.
(3) And carrying out fire lifting/fire lowering on the at least two heating furnaces according to the distributed fire lifting/fire lowering times.
If the production index temperature is below the lower edge of the target interval, the distributed heating furnaces can be subjected to ignition according to the distributed ignition times; and if the production index temperature is above the upper edge of the target interval, reducing the fire of the distributed heating furnaces according to the distributed fire reduction times.
(4) Waiting a time interval after the fire is initiated/reduced.
A time interval is needed from the start of the heating furnace ignition/fire reduction to the time when the production index temperature is correspondingly changed and stabilized, and the time interval is not fixed and can be dynamically generated and adjusted by a system according to empirical data/field data in a certain mode.
After a waiting time interval after the ignition/misfire, the next operation is performed. For example, the production index temperature is continuously compared with a preset target interval, and what adjustment mode is applied next is judged.
(II) Slow adjustment
In this embodiment, when the production target temperature falls outside the target interval and the temperature difference is between the first set value and the second set value, the slow adjustment is performed, wherein the second set value is smaller than the first set value.
Assuming a target interval of [50, 70], the two endpoints of the target interval are 50 degrees celsius at the lower edge and 70 degrees celsius at the upper edge, respectively. Assuming that the first set point is set to 3 degrees celsius and assuming that the second set point is 0.5 degrees celsius, a slow adjustment can be made when the production target temperature is between [47, 49.5] degrees celsius or between [70.5, 73] degrees celsius.
Optionally, when the production index temperature falls within the target interval and the temperature difference is between the first set value and the second set value, slow adjustment may also be performed. For example, still assume that the target interval is [50, 70], the first set point is set to 3 degrees celsius, and the second set point is 0.5 degrees celsius; the slow adjustment can be made when the production target temperature is between 50.5, 53 degrees celsius or between 67, 69.5 degrees celsius.
Taking the annealing as an example, when the difference between the production index temperature and the temperature of the lower edge of the target interval is small, or the target interval is entered, the production index temperature can be effectively adjusted only by adjusting a single heating furnace, namely, only by slow adjustment.
The slow speed adjusting function is to determine the difference between the production index temperature and the temperature at the lower edge of the target interval, and if the difference is small or the difference has entered the interval, for example, the difference reaches 3 ℃ (the first set value, configurable), especially the difference with the end point is not very small, for example, the difference exceeds 0.5 ℃ (the second set value, configurable, or above, then the slow speed adjustment can be performed.
The principle of fire reduction is the same, and the detailed description is omitted.
In some embodiments, the step of slowly adjusting comprises:
(1) dynamically adjusting the time interval according to the temperature difference;
the time interval is the time required from the start of the ignition/ignition of the heating furnace to the corresponding change in the production target temperature and the stabilization thereof. The time interval is not fixed and can be dynamically generated and adjusted in a certain manner by the system based on empirical/field data.
(2) Taking a heating furnace meeting the conditions as follows:
firstly, the heating furnace conforms to intelligent control configuration;
the temperature of the furnace body is in the buffer area;
and thirdly, sorting according to the difference value between the furnace body temperature and the outlet temperature (for example, the furnace body temperature is small to large).
(3) And carrying out primary ignition/fire reduction on the selected heating furnace. How to select the heating furnace is not limited, and for example, one heating furnace may be selected randomly. Optionally, a first heating furnace may be selected according to a certain strategy, for example, according to the above sequence, to perform a fire raising/reducing.
(4) Waiting a time interval after the ignition/misfire, the time interval being dynamically generated.
After a waiting time interval after the ignition/misfire, the next operation is performed. For example, the production index temperature is continuously compared with a preset target interval, and what adjustment mode is applied next is judged.
(III) buffer Regulation
In this embodiment, when the temperature difference is smaller than or equal to the second set value, the production indicator temperature enters the production indicator buffer area, and the buffer section is adjusted according to the variation trend of the production indicator temperature.
In this embodiment, the buffer section adjusting function is to set a production indicator buffer area at the edge of the target interval, including the upper edge and the lower edge, and if the production indicator temperature enters the buffer area, it is further necessary to calculate a result according to a temperature change trend to determine whether to promote/reduce a fire. For example, the production indicator buffer area may be set based on a second set value, and an area with a distance from any end point of the target area as an end point to the end point within the second set value is set as one production indicator buffer area.
In some embodiments, the buffer stage adjusting step comprises:
(1) and calculating the variation trend of the production index temperature within a certain time.
The variation trend comprises an ascending trend, a descending trend and a stable trend.
In some embodiments, the production indicator temperature may be averaged at first and last two time points (configurable) in a unit time interval, and then averaged over a second unit time interval, decreasing each other. If the difference exceeds a set threshold (configurable), the corresponding trend is determined. For example, a threshold value of 1 is set, the temperatures of the points to be taken are assumed to be 50, 51, 52 and 53, the average values in each unit time interval are calculated to obtain 50.5, 51.5 and 52.5, the points are combined when 52.5-51.5 are calculated to be 1, 50 is substituted for 51 to be 50, 52 and 53, the average values 51 and 52.5 are calculated again, and the trend of change is found to be an ascending trend when 52.5-51 are calculated to be 1.5> 1. The same applies to the downward trend. If no ascending or descending trend is determined after the point is taken for more than 3 times, the trend is regarded as a stable trend.
(2) And setting a buffer area, and adjusting according to the variation trend of the temperature.
a) Buffer zone of heating furnace
See below.
b) Production indicator buffer
In order to ensure that the temperature parameters of the production indexes are controlled in a target interval, 4 buffer zones can be generally arranged, and whether the fire is required to be promoted or reduced is judged by combining the temperature change trend. Assuming that the target interval is [52, 55] and the buffer temperature (e.g., equal to the second set value) is 0.5, the following buffer zones may be set:
(ii) a first buffer zone outside the lower edge of the interval [51.5-52]
When the production index temperature is in the first buffer area, calculating the temperature trend, if the temperature trend is an ascending trend, not lifting fire, maintaining the current situation, and waiting for the production index temperature to continuously ascend; and if the temperature is in the descending trend or the stable trend, the fire is promoted so as to lead the production index temperature to be close to the center of the target interval.
② second buffer zone [52-52.5] in the lower edge of the interval
When the production index temperature is positioned in the second buffer area, calculating the temperature trend, and if the temperature trend is a descending trend or a stable trend, carrying out fire raising so as to enable the production index temperature to approach the center of a target area; if the temperature is in the rising trend, the fire is not lifted, the current situation is maintained, and the temperature of the production index is waited to continue rising.
③ third buffer zone (54.5-55) in the upper edge of the interval
When the production index temperature is in the third buffer area, calculating the temperature trend, and if the temperature trend is a descending trend, not reducing the fire; if the trend is ascending or stable, the fire will be decreased.
Fourth buffer zone (55-55.5) outside the upper edge of the interval
When the production index temperature is positioned in the fourth buffer area, calculating the temperature trend, and if the temperature trend is a descending trend, not reducing the fire; if the trend is ascending or stable, the fire will be decreased.
As described above, the adjustment is made according to the trend of change: if the change trend is close to the center of the target interval, maintaining the current situation; if the variation trend is far away from the center of the target interval, selecting a heating furnace, and carrying out primary ignition/ignition reduction on the heating furnace to enable the production index temperature to approach the center of the target interval.
Three adjusting modes of the invention are explained in detail above, and the centralized control of the oil field heating furnace can be realized through the three adjusting modes.
In order to realize better heating furnace management and control, some embodiments of the invention further provide other adjusting modes to ensure safe production and realize energy-saving management and control. In the following, the fourth and fifth adjustment modes of the present invention will be further explained, and these two adjustment modes can be applied in combination with the above three adjustment modes.
(IV) monitoring the temperature of the heating furnace
In order to realize the safety production guarantee method, the temperature of a single heating furnace can be monitored, and the temperature hosting function is provided.
The temperature hosting function is to ensure that the temperature of the heating furnace runs in a reasonable interval by setting a buffer area and combining the variation trend of the temperature, and prevent low-temperature restart and high-temperature alarm. The setting of the buffer zone of the heating furnace is different from that of the buffer zone of the production index, and because the heating furnace has the hard requirement of temperature, only two buffer zones can be set, and the value of the buffer temperature is larger. The reasonable interval of the temperature of the heating furnace is assumed to be [50-80], the unit is centigrade, and the buffer temperature is assumed to be 3. The following buffers may be set:
(ii) lower edge buffers within the lower edge of the interval, e.g. [50-53]
When the temperature of the heating furnace is in the lower edge buffer zone, calculating the variation trend of the temperature of the heating furnace, and if the variation trend is a descending trend and a stable trend, forcibly igniting; if the tendency is rising, the fire is not lifted and the current situation is maintained.
② the upper edge buffer zone in the upper edge of the interval, for example [77-80]
When the temperature of the heating furnace is in the upper edge buffer zone, calculating the variation trend of the temperature of the heating furnace, and if the variation trend is an ascending trend and a stable trend, forcibly reducing the temperature; if the trend is downward, the fire does not fall, and the current situation is maintained.
Before the temperature hosting function is started, furnace body temperature self-checking is preferably carried out on each heating furnace, and subsequent hosting can be carried out only after the temperature of the heating furnace is controlled between two buffer zones at the upper edge and the lower edge of the interval.
As described above, the method according to the embodiment of the present invention may further include the above temperature hosting process, and as shown in fig. 2, the temperature hosting process may include the following steps:
21. presetting a reasonable interval aiming at the temperature of the heating furnace, and respectively presetting an upper edge buffer zone and a lower edge buffer zone at the upper edge and the lower edge of the reasonable interval;
22. judging whether the temperature of each heating furnace falls between a lower edge buffer area and an upper edge buffer area in a reasonable interval, and if so, starting a temperature supporting pipe of the heating furnace;
the heating furnace temperature hosting comprises:
23. when the temperature of the heating furnace falls into the lower edge buffer zone or the upper edge buffer zone, calculating the change trend of the temperature of the heating furnace within a certain time;
24. if the change trend is close to the center of the reasonable interval, the current situation is maintained;
25. if the variation trend is far away from the center of the reasonable interval, the heating furnace is subjected to primary ignition/ignition reduction, so that the temperature of the heating furnace is close to the center of the reasonable interval.
(V) energy conservation management and control
The energy-saving control function is used for improving the energy utilization rate of a plurality of heating furnaces of the whole system as much as possible, and can comprise the following procedures:
1. energy utilization calculation
The production indicator temperature is recorded at intervals, for example using variance or other algorithms to detect if the temperature is stable.
If the temperature of the production index is stable, selecting a heating furnace, lifting/lowering a first grade of fuel gas (namely lifting/lowering the fire once), and then detecting the temperature change of the production index until the temperature is stable. Before and after the process, the temperature difference of the production index is delta C, the difference value of the gas flow is delta q, and the energy utilization rate is delta C/delta q.
2. Energy saving regulation
After calculating the energy utilization rate of each furnace, executing the following steps:
the method has the advantages that the heating furnace with the highest energy utilization rate (namely, fire lifting) is improved, the heating furnace with the lowest energy utilization rate (namely, fire lowering) is reduced, namely, the gas quantity of the heating furnace with the highest energy utilization rate is increased, and the gas quantity of the heating furnace with the lowest energy utilization rate is reduced.
② the load factor was observed. The load factor calculation/measurement method is implemented according to the prior art. Generally, each temperature gear of each heating furnace corresponds to a respective optimal load rate, and the optimal load rate is generally between 80% and 90%.
And thirdly, if the heating furnace with the highest energy utilization rate reaches the load rate, the next heating furnace can be adjusted according to the rank of the energy utilization rate. When the energy utilization rate is reduced to the lower limit, the corresponding heating furnaces can be sequentially adjusted according to the sequence of the energy utilization rate from low to high.
For example: the energy utilization rate of the heating furnace A is assumed as follows: 80%, the energy utilization rate of the heating furnace B is as follows: 50%, the energy utilization rate of the heating furnace C is as follows: 40 percent. As shown in fig. 4-1, in the manual operation, without paying attention to the energy utilization rate, it is assumed that 125+200+250 m, 575m is consumed for 1 hour by a plurality of heating furnaces in order to raise the production index temperature by a certain degree, for example, 3 ℃3Natural gas (the volume ratio of the natural gas consumed by the heating furnace is equal to the reciprocal ratio of the respective energy utilization rates). As shown in FIG. 4-2, if the energy-saving adjustment step of the present invention is adopted to improve the heating furnace with high energy utilization rate as much as possible, and finally the volume ratio of the natural gas consumed by the heating furnace is equal to the ratio of the respective energy utilization rates, the temperature of the production index is raised to a certain extentThe natural gas consumed by a plurality of heating furnaces for 1 hour is changed into 475m from 250+100+125 degrees, for example, 3 degrees centigrade3The gas saving in 1 hour is 575-3。
3. Load rate adjustment
The high-efficiency load rate of the heating furnace is 80-90% in the operation interval.
4. Energy utilization update
And when the temperature is stable, recalculating the energy utilization rate of the heating furnace, and then repeating the steps to adjust the heating furnace according to the latest energy utilization rate.
As described above, the method according to the embodiment of the present invention may further include the energy saving control process, as shown in fig. 3, the energy saving control process may include the following steps:
31. calculating the energy utilization rate of each heating furnace;
32. carry out primary temperature control according to energy utilization ratio, include: the heating furnace with the highest energy utilization rate is ignited once, and the heating furnace with the lowest energy utilization rate is ignited once;
then, the load factor of each heating furnace is determined, and the temperature can be further adjusted according to the load factor, which is detailed in the above flow.
Optionally, the adjustment mode of the energy saving management and control function may be combined with the three adjustment modes of the centralized management and control function, for example, one application may be: in the aforementioned step of adjusting the buffer section, a heating furnace with the highest energy utilization rate may be selected for the ignition/fire reduction.
To sum up, the embodiment of the invention discloses a control method for an oil field heating furnace, which comprises a centralized control flow, a temperature hosting flow, an energy-saving control flow and the like, and achieves the following technical effects:
1. by comparing the production index temperature with a preset target interval, the temperature of the heating furnace is adjusted by accurately selecting a proper mode from multiple adjusting modes, so that the production target can be safely, quickly and accurately achieved;
2. in some implementation modes, the energy-saving heating furnace can be further adjusted according to the energy utilization rate of the heating furnace, and the combustion of the heating furnace is macroscopically allocated, so that the energy-saving effect is achieved;
3. in some implementation modes, the temperature of the heating furnace is preset to be within a reasonable range, a corresponding buffer area and corresponding automatic control are carried out, and the production target can be kept stable at any time along with the change of environment and medium.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A management and control method for heating furnaces in oil fields is characterized in that medium outlets of a plurality of heating furnaces are connected to a production area, and production index temperature is determined by the plurality of heating furnaces;
the method comprises the following steps:
comparing the production index temperature with a preset target interval;
according to the distance between the production index temperature and the target interval, performing rapid adjustment or slow adjustment or buffer adjustment on the plurality of heating furnaces;
in the step of adjusting the buffer section, the heating furnace is subjected to fire lifting or fire reducing or the current situation is maintained according to the variation trend of the temperature of the production index.
2. The method of claim 1,
when the production index temperature falls outside the target interval and the temperature difference is greater than a first set value, quickly adjusting;
when the production index temperature falls outside the target interval and the temperature difference value is between the first set value and the second set value, performing slow adjustment;
when the temperature difference is smaller than or equal to a second set value, the production index temperature enters a production index buffer area, and the buffer section is adjusted according to the variation trend of the production index temperature;
the temperature difference is the difference between the production index temperature and the end point of the adjacent target interval, and the second set value is smaller than the first set value.
3. The method of claim 2, wherein the rapidly adjusting step comprises:
estimating the required ignition/ignition reduction times according to the temperature difference;
distributing the estimated ignition/ignition reduction times to at least two heating furnaces;
carrying out fire lifting/fire lowering on the at least two heating furnaces according to the distributed fire lifting/fire lowering times;
waiting a time interval after the fire is initiated/reduced.
4. The method of claim 2, wherein the slow adjustment step comprises:
selecting a heating furnace, and carrying out primary fire lifting/fire lowering on the heating furnace;
waiting a time interval after the fire is initiated/reduced.
5. The method of claim 2, wherein the buffer stage adjusting step comprises:
calculating the variation trend of the production index temperature within a certain time;
if the change trend is close to the center of the target interval, maintaining the current situation;
if the variation trend is far away from the center of the target interval, selecting a heating furnace, and carrying out primary ignition/ignition reduction on the heating furnace to enable the production index temperature to approach the center of the target interval.
6. The method of claim 1, further comprising:
presetting a reasonable interval aiming at the temperature of the heating furnace, and respectively presetting an upper edge buffer zone and a lower edge buffer zone at the upper edge and the lower edge of the reasonable interval;
judging whether the temperature of each heating furnace falls between a lower edge buffer area and an upper edge buffer area in a reasonable interval, and if so, starting a temperature supporting pipe of the heating furnace;
the heating furnace temperature hosting comprises: when the temperature of the heating furnace falls into the lower edge buffer zone or the upper edge buffer zone, calculating the change trend of the temperature of the heating furnace within a certain time; if the change trend is close to the center of the reasonable interval, the current situation is maintained; if the variation trend is far away from the center of the reasonable interval, the heating furnace is subjected to primary ignition/ignition reduction, so that the temperature of the heating furnace is close to the center of the reasonable interval.
7. The method of claim 1, further comprising:
calculating the energy utilization rate of each heating furnace;
carry out primary temperature control according to energy utilization ratio, include: and (4) carrying out fire raising once on the heating furnace with the highest energy utilization rate, and carrying out fire lowering once on the heating furnace with the lowest energy utilization rate.
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