CN110608619A - Method and system for monitoring operation of heating furnace - Google Patents
Method and system for monitoring operation of heating furnace Download PDFInfo
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- CN110608619A CN110608619A CN201910968605.2A CN201910968605A CN110608619A CN 110608619 A CN110608619 A CN 110608619A CN 201910968605 A CN201910968605 A CN 201910968605A CN 110608619 A CN110608619 A CN 110608619A
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- cracking furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to an operation monitoring method and a system of a heating furnace, belonging to the technical field of cracking reaction monitoring, aiming at solving the problem that the actual operation condition of a single cracking furnace tube in the heating furnace along with the reaction time in the operation process cannot be timely and accurately reflected by the monitoring result due to the larger temperature deviation of the outlet of the heating furnace in the prior art, therefore, the method comprises the following steps: acquiring temperature values of outlet sections of all cracking furnace tubes at different moments, and acquiring average temperature values of outlet sections of all cracking furnace tubes at corresponding moments; respectively calculating to obtain a temperature difference value between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding moment; calculating to obtain a difference value between two temperature difference values at different moments; according to the difference, the operation condition of each cracking furnace tube along with the cracking reaction time is represented, the operation condition of a single cracking furnace tube along with the reaction time in the heating furnace can be timely and accurately reflected, and an accurate basis is provided for the optimal operation of the heating furnace.
Description
Technical Field
The invention relates to the technical field of cracking reaction monitoring, in particular to a method and a system for monitoring the operation of a heating furnace.
Background
The outlet temperature of the cracking furnace tube is the main index of the cracking reaction, and the change of the outlet temperature directly reflects the depth of the cracking reaction and the operating condition of the cracking furnace or the heating furnace. It is known that, under the condition of a fixed heating furnace type, the arrangement and the geometric parameters of the furnace tubes are determined, and at the moment, for a given cracking raw material and load, the temperature at the outlet of the furnace can represent the cracking depth to a certain extent and is used for distinguishing shallow cracking, medium cracking and deep cracking, wherein the higher the temperature is, the larger the cracking depth is.
At present, the outlet temperature is predicted by monitoring the temperature of the tube wall of the furnace tube, but due to the reasons of hardware, operation and the like, each cracking furnace tube has certain differences, for example:
in hardware: 1. furnace tube material: the furnace tube has enough strength and heat transfer coefficient as large as possible, and the materials of the furnace tubes are different from each other when the high-chromium nickel alloy furnace tube is commonly used; 2. a feeding distributor: the feeding of the distributor is required to be uniformly distributed to each furnace tube as much as possible, but the manufacturing precision of the distributor is difficult to ensure that each distribution original piece is the same and has certain difference; 3. the arrangement method of the furnace tube comprises the following steps: the arrangement of the furnace tubes is perfectly symmetrical as much as possible, but the arrangement is not practical, has certain deviation and has certain influence on the uniform distribution.
The operation is as follows: 1. an operating pressure; the operation pressure has certain influence on the reaction temperature, the higher the pressure is, the more unfavorable the cracking reaction is, and the furnace tube temperature can be changed correspondingly. Therefore, the pressure fluctuation during the operation can also cause the furnace tube temperature fluctuation; 2. the types of raw materials are as follows: optimum cracking conditions exist for different feedstocks. The temperature of the furnace tube needs to be correspondingly adjusted when the raw materials change; 3. dilution steam ratio: dilution steam ratio is a means of adjusting hydrocarbon partial pressure, and changes in the dilution steam ratio can affect the degree of progress of the cracking reaction, correspondingly cause changes in the furnace tube temperature, and also affect the furnace tube temperature due to fluctuations in the operation process.
Because the temperature of each furnace tube is unique due to the fluctuation of all factors and the imperfection of hardware in the operation process, the operation condition of each cracking furnace tube in the heating furnace along with the reaction time cannot be accurately reflected by the monitoring result of the traditional monitoring method, and the optimal operation of the heating furnace is influenced.
Accordingly, there is a need in the art for a new method and system for monitoring the operation of a furnace to address the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a method and a system for monitoring the operation of a heating furnace, which can represent the operation condition of each cracking furnace tube, can more timely and accurately reflect the actual operation condition of a single cracking furnace tube in the cracking furnace along with the reaction time in the operation process, and are favorable for the optimal operation of the heating furnace.
One of the above objects of the present invention is achieved by the following technical solutions: an operation monitoring method of a heating furnace, wherein the heating furnace comprises a plurality of cracking furnace tubes, and the operation control method comprises the following steps:
acquiring temperature values of outlet sections of all cracking furnace tubes at different moments, and acquiring average temperature values of all cracking furnace tubes at corresponding moments;
respectively calculating to obtain a temperature difference value between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding moment;
calculating to obtain a difference value between two temperature difference values at different moments;
and according to the difference, representing the running condition of each cracking furnace tube along with the cracking reaction time.
In a preferred embodiment of the above method for monitoring the operation of the heating furnace, the step of "characterizing the operation status of each cracking furnace tube along with the cracking reaction time according to the difference" includes:
comparing the difference value with a set value or a set range;
and determining the running state of the corresponding cracking furnace tube according to the comparison result of the difference and the set value or the set range.
In a preferred embodiment of the above method for monitoring the operation of the heating furnace, the step of determining the operation status of the corresponding cracking furnace tube according to the comparison result between the difference and the set value or the set range further includes:
and when the difference is larger than or equal to the set value or exceeds the set range, determining that the corresponding cracking furnace tube needs to be decoked.
In the preferred technical solution of the above-mentioned method for monitoring the operation of the heating furnace, the step of "obtaining the temperature value of the outlet section of each cracking furnace tube at different times, and obtaining the average temperature value of all cracking furnace tubes at corresponding times" specifically includes:
at one moment in the starting stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes;
and at one moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes.
In the preferred technical solution of the above-mentioned method for monitoring the operation of the heating furnace, the step of "obtaining the temperature value of the outlet section of each cracking furnace tube at different times, and obtaining the average temperature value of all cracking furnace tubes at corresponding times" specifically includes:
at one moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes;
and at the other moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube and obtaining the average temperature value of all the cracking furnace tubes.
The second purpose of the invention is realized by the following technical scheme: an operation monitoring system of a heating furnace, the heating furnace comprises a plurality of cracking furnace tubes, and at least one temperature measuring device is configured at an outlet section of each cracking furnace tube, the system comprises:
the acquisition unit is used for acquiring the temperature value of the outlet section of each cracking furnace tube measured at different moments by the temperature measuring device and acquiring the average temperature value of all the cracking furnace tubes at corresponding moments;
a calculating unit for respectively calculating the temperature difference between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding moment, and
calculating to obtain a difference value between two temperature difference values at different moments;
and the judging unit is used for representing the running condition of each cracking furnace tube along with the cracking reaction time according to the difference.
In a preferred embodiment of the above operation monitoring system for a heating furnace, the determination unit is specifically configured to compare the difference with a set value or a set range; and determining the running state of the corresponding cracking furnace tube according to the comparison result of the difference and the set value or the set range.
In a preferred technical solution of the operation monitoring system of the heating furnace, the determination unit is specifically configured to determine that the corresponding cracking furnace tube needs to be decoked when the difference is greater than or equal to a set value or exceeds a set range.
In a preferred technical scheme of the operation monitoring system of the heating furnace, the temperature measuring device comprises a metal wall temperature detecting thermocouple.
In conclusion, the beneficial technical effects of the invention are as follows:
1. by measuring the outlet temperature of each cracking furnace tube at different moments and making the difference between the temperature of each cracking furnace tube and the average temperature of all the cracking furnace tubes, the real temperature of each cracking furnace tube at different stages can be judged, and compared with the traditional method of directly using the average value as a reference index, the method can reduce the influence caused by errors; the operating condition of each cracking furnace tube can be represented by utilizing the difference value of the two temperature differences in different stages, the actual operating condition of a single cracking furnace tube along with the reaction time in the operating process can be reflected more timely and accurately, and the optimal operation of the heating furnace is facilitated;
2. through monitoring the outlet temperature of each cracking furnace tube, the balance control of the outlet temperature of each cracking furnace tube is facilitated to provide accurate basis.
Drawings
Fig. 1 shows a schematic flow diagram of the operation monitoring method according to the invention.
Fig. 2 shows a system diagram of the operation monitoring system of the present invention.
Fig. 3 shows a schematic configuration of a control device in the operation monitoring system of the present invention.
Reference numerals: 20. a temperature measuring device; 30. a control device; 301. an acquisition unit; 302. a calculation unit; 303. and a determination unit.
Detailed Description
First, it should be understood by those skilled in the art that the embodiments described herein are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. For example, although the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the underlying principles of the invention.
The invention provides an operation monitoring method of a heating furnace. Specifically, the heating furnace comprises a plurality of cracking furnace tubes, the temperature values of the outlet sections of the cracking furnace tubes at different moments can be obtained, the average temperature values of all the cracking furnace tubes at corresponding moments are obtained, the temperature difference value between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at corresponding moments is obtained through calculation, the difference value between the two temperature difference values at different moments is obtained through calculation, the operation condition of each cracking furnace tube can be represented according to the difference value, the actual operation condition of a single cracking furnace tube along with the reaction time in the operation process can be reflected more timely and accurately, and therefore accurate basis is provided for the optimized operation of the heating furnace.
Furthermore, the step of characterizing the operation status of each cracking furnace tube along with the cracking reaction time according to the difference is to compare the difference with a set value or a set range, and then determine the operation status of the corresponding heating furnace according to the comparison result of the difference with the set value or the set range. In one example, when the difference is greater than or equal to the set value or exceeds the set range, it is determined that the corresponding cracking furnace tube has a heat transfer problem or a blockage risk, and the corresponding cracking furnace tube needs to be decoked.
According to the preferred embodiment of the operation monitoring method of the heating furnace, the step of obtaining the temperature value of each cracking furnace tube outlet section at different moments and obtaining the average temperature value of all cracking furnace tube outlet sections at corresponding moments comprises the steps of obtaining the temperature value of each cracking furnace tube outlet section at one moment of a starting stage and obtaining the average temperature value of all cracking furnace tubes; and at one moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes.
According to another preferred embodiment of the method for monitoring the operation of the heating furnace of the present invention, the step of "obtaining the temperature value of the outlet section of each cracking furnace tube at different times and obtaining the average temperature value of the outlet sections of all cracking furnace tubes at corresponding times" also includes obtaining the temperature value of the outlet section of each cracking furnace tube at one time of the operation stage and obtaining the average temperature value of all cracking furnace tubes; and at the other moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube and obtaining the average temperature value of all the cracking furnace tubes.
The invention also provides an operation monitoring system of the heating furnace. Referring to fig. 2 and 3, fig. 2 shows a system schematic of the operation monitoring system of the present invention. Fig. 3 shows a schematic configuration of the control device 30 in the operation monitoring system of the present invention. As shown in FIGS. 2 and 3, the system mainly comprises a plurality of cracking furnace tubes, and at least one temperature measuring device 20 is arranged at the outlet section of each cracking furnace tube. Preferably, the temperature measuring device 20 is a metal wall temperature detecting thermocouple. In this system, an acquisition unit 301, a calculation unit 302, and a determination unit 303 are further included. The obtaining unit 301 is configured to obtain temperature values of the outlet section of each cracking furnace tube measured at different times by the temperature measuring device 20, and obtain average temperature values of all cracking furnace tubes at corresponding times; a calculating unit 302, configured to calculate a temperature difference value between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding time, and calculate a difference value between the two temperature difference values at different times; and the determining unit 303 is configured to characterize an operating condition of each cracking furnace tube along with the cracking reaction time according to the difference.
It should be noted that the obtaining unit 301, the calculating unit 302, and the determining unit 303 can be integrated in the control device 30, and the control device 30 can control each temperature measuring device 20 to perform temperature detection, and can analyze and calculate the temperature detection data to obtain average temperature values of all cracking furnace tubes at different times, a temperature difference value between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding time, and a difference value between two temperature difference values at different times, and perform determination processing according to the difference value, so as to know the operating condition of each cracking furnace tube, and facilitate the optimal operation of the heating furnace. Here, the control device 30 may be a control device of the heating furnace itself, or may be an additional control device or a control terminal.
Next, referring to fig. 1, the operation monitoring method of the heating furnace according to the present invention will be described by taking the example of obtaining the temperature value of each cracking furnace tube at two times of the start-up phase and the operation phase. Fig. 1 shows a schematic flow diagram of the operation monitoring method according to the invention.
As shown in fig. 1, the operation monitoring method mainly includes the following steps:
s101, recording the detected temperature t of each cracking furnace tube in the starting stage0Further obtain the average temperature of all cracking furnace tubes
S102, calculating the temperature t of each cracking furnace tube0And average temperatureTemperature difference ofOr
S103, recording the detected temperature t of each cracking furnace tube in the normal operation stage1Further obtain the average temperature of all cracking furnace tubes
S104, calculating the temperature t of each cracking furnace tube1And average temperatureTemperature difference ofOr
S105, calculating the difference δ between the two temperature differences in step S104 and step S1021-δ0Or δ ═ δ1-δ0L, |; wherein, delta is used for representing the operating condition of each cracking furnace tube, and can more timely and accurately reflect the operating condition of a single cracking furnace tube along with the cracking reaction time.
S106, judging whether the difference value delta of the two temperature differences obtained in the step S105 exceeds a set range or is larger than or equal to a set value X;
s107, when delta is larger than or equal to X or delta exceeds a set range, determining that the decoking treatment needs to be carried out on the cracking furnace tube.
Specifically, the starting stage can comprise the steps of feeding, steam heating and the like, preferably, after steam heating is selected at one moment in the starting stage, measurement is carried out before formal starting, and the influence of the temperature before starting on the later-stage judgment of the operation condition of the cracking furnace tube is avoided; the operation stage is a stage after the heating furnace is formally started, and the operation condition of each cracking furnace tube is judged as accurately as possible by respectively collecting the temperature values of the cracking furnace tubes in the start stage and the operation stage and by using the method in the step S106, so that the outlet temperature of each cracking furnace tube is adjusted and controlled, and the optimal operation of the heating furnace is facilitated.
The method of the invention is to monitor each cracking furnace tube individually, and the temperature value measured by each cracking furnace tube is used for making a difference with the average value of the temperature values of all the cracking furnace tubes at the same time, so that the operation condition of each cracking furnace tube can be judged accurately in time, and the operation condition of each cracking furnace tube along with the cracking reaction time in the period of time is reflected by using the difference value of the temperature difference values of different stages.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An operation monitoring method of a heating furnace, wherein the heating furnace comprises a plurality of cracking furnace tubes, and is characterized in that the operation control method comprises the following steps:
acquiring temperature values of outlet sections of all cracking furnace tubes at different moments, and acquiring average temperature values of outlet sections of all cracking furnace tubes at corresponding moments;
respectively calculating to obtain a temperature difference value between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding moment;
calculating to obtain a difference value between two temperature difference values at different moments;
and according to the difference, representing the running condition of each cracking furnace tube along with the cracking reaction time.
2. The method for monitoring the operation of a furnace according to claim 1, wherein the step of characterizing the operation of each cracking furnace tube over the cracking reaction time based on the difference comprises:
comparing the difference value with a set value or a set range;
and determining the running state of the corresponding cracking furnace tube according to the comparison result of the difference and the set value or the set range.
3. The method for monitoring the operation of a heating furnace according to claim 2, wherein the step of determining the operation condition of the corresponding cracking furnace tube according to the comparison result between the difference and the set value or the set range further comprises:
and when the difference is larger than or equal to the set value or exceeds the set range, determining that the corresponding cracking furnace tube needs to be decoked.
4. The operation monitoring method of the heating furnace according to claim 1, wherein the step of obtaining the temperature value of each outlet section of the cracking furnace tube at different moments and obtaining the average temperature value of all outlet sections of the cracking furnace tube at corresponding moments specifically comprises:
at one moment in the starting stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes;
and at one moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes.
5. The operation monitoring method of the heating furnace according to claim 1, wherein the step of obtaining the temperature value of the outlet section of each cracking furnace tube at different moments and obtaining the average temperature value of all cracking furnace tubes at corresponding moments specifically comprises:
at one moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube, and acquiring the average temperature value of all the cracking furnace tubes;
and at the other moment of the operation stage, acquiring the temperature value of the outlet section of each cracking furnace tube and obtaining the average temperature value of all the cracking furnace tubes.
6. An operation monitoring system of a heating furnace, the heating furnace comprising a plurality of cracking furnace tubes, wherein at least one temperature measuring device (20) is provided to an outlet section of each cracking furnace tube, the system comprising:
the acquisition unit (301) is used for acquiring the temperature value of the outlet section of each cracking furnace tube measured at different moments by the temperature measuring device (20) and acquiring the average temperature value of all the cracking furnace tubes at corresponding moments;
a calculating unit (302) for calculating a temperature difference between the temperature value of the outlet section of each cracking furnace tube and the average temperature value at the corresponding moment, respectively, and
calculating to obtain a difference value between two temperature difference values at different moments;
and the judging unit (303) is used for characterizing the running condition of each cracking furnace tube along with the cracking reaction time according to the difference.
7. The operation monitoring system of the heating furnace according to claim 6, characterized in that the decision unit (303) is specifically configured to compare the difference with a set value or a set range; and determining the running state of the corresponding cracking furnace tube according to the comparison result of the difference and the set value or the set range.
8. The operation monitoring system of the heating furnace according to claim 7, wherein the determining unit (303) is specifically configured to determine that the corresponding cracking furnace tube needs to be decoked when the difference is greater than or equal to a set value or exceeds a set range.
9. The operation monitoring system of the heating furnace according to claim 6, wherein the temperature measuring device (20) comprises a metal wall temperature detecting thermocouple.
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| CN201910968605.2A CN110608619B (en) | 2019-10-12 | 2019-10-12 | Method and system for monitoring operation of heating furnace |
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| CN201910968605.2A CN110608619B (en) | 2019-10-12 | 2019-10-12 | Method and system for monitoring operation of heating furnace |
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