CN111414691B - Method for determining secondary energy efficiency limit value of heating furnace - Google Patents
Method for determining secondary energy efficiency limit value of heating furnace Download PDFInfo
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- CN111414691B CN111414691B CN202010194329.1A CN202010194329A CN111414691B CN 111414691 B CN111414691 B CN 111414691B CN 202010194329 A CN202010194329 A CN 202010194329A CN 111414691 B CN111414691 B CN 111414691B
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Abstract
The invention relates to a method for determining a secondary energy efficiency limit value of a heating furnace, which belongs to the field of energy efficiency evaluation of oil field heating furnaces, and the method utilizes software to simulate the working state of the heating furnace, obtains the linear relation between the heat efficiency and the load factor, and introduces the influence of the load factor into the energy-saving work of the heating furnace, and comprises the following steps: s1, collecting oil field working data, and determining basic parameters of the heating furnace in an energy-saving state; s2, simulating the working condition of the heating furnace by using HTRI software to obtain the corresponding relation between the load factor and the efficiency limit value, and performing linear fitting on the heat efficiency and the load factor; and S3, evaluating energy saving by using a relational expression between the heat efficiency and the load factor. The method adopts the simulation idea to obtain the thermal efficiency limit value, reduces the dependence on field data on the basis of considering the influence of the load factor on the thermal efficiency, and facilitates the development of the energy-saving evaluation work of the oil field heating furnace.
Description
Technical Field
The invention relates to the field of energy efficiency evaluation of oil field heating furnaces, in particular to a method for determining a secondary energy efficiency limit value.
Background
Aiming at specific national conditions such as low energy utilization rate, high energy consumption level and the like, the energy efficiency standard is introduced in China. The effective implementation of an energy efficiency standard system is beneficial to relieving the energy demand pressure of various industries and guiding enterprises to realize production environment friendliness. For a heating furnace of high-energy-consumption equipment of an oil-gas field, energy efficiency limit values of three levels are set in China and expressed by efficiency values, wherein the secondary limit values are also called energy-saving evaluation values and represent the lowest values which the efficiency of the energy-saving heating furnace should reach under the specified test conditions.
After the oil field applies the new energy-saving technology, the heat efficiency of a plurality of test furnaces needs to be firstly measured and compared with a secondary limit value to judge whether the batch of heating furnaces meet the energy-saving requirement. According to GB 24848 and 2010 energy efficiency limiting value and energy efficiency grade of heating furnaces for petroleum industry, the specified test condition of the heating furnaces is not less than 75% of rated load. However, under the actual measurement condition, the load factor of the heating furnace is often difficult to reach the test standard due to the influence of factors such as the oil field on-site oil well yield fluctuation, and the energy-saving acceptance check work is difficult to be smoothly carried out.
Therefore, the existing research generally considers that the influence of the load rate is introduced into a secondary limit value, a relational expression of the load rate and an efficiency limit value is obtained, and further the energy-saving evaluation can be carried out on the heating furnace under the low load rate. And the energy efficiency limit value is mostly determined by adopting a coverage rate thought, the application basis is a large amount of field data, the second-level thermal efficiency limit value is obtained by adopting a software simulation thought aiming at the situation that the field data of the oil field is difficult to obtain comprehensively, the dependence on the data is reduced, and the actual application is convenient.
Disclosure of Invention
In order to solve the problem that the energy-saving evaluation of the heating furnace with low load rate cannot be carried out in actual work and reduce the dependence on field data, the invention utilizes special calculation software HTRI of the heating furnace to carry out working condition simulation, utilizes basic data of a product in an energy-saving state to simulate a critical state after energy-saving measures are taken, and obtains corresponding efficiency limit values based on different load rates. And further fitting a relational expression of the load factor and the efficiency limit value, and evaluating the energy-saving condition of the heating furnace by using the relational expression.
The technical scheme adopted by the invention is as follows:
the invention provides a method for obtaining a secondary energy efficiency limit value of an oil field heating furnace by software simulation, which comprises the following steps of:
s1, collecting oil field working data, and determining basic parameters of the heating furnace in an energy-saving state;
s2, simulating the working condition of the heating furnace by using HTRI software to obtain the corresponding relation between the load factor and the efficiency limit value, and performing linear fitting on the heat efficiency and the load factor;
and S3, evaluating energy saving by using a relational expression between the heat efficiency and the load factor. Further, the step S2 specifically includes:
s21, dividing the heating furnace according to the rated power according to the method specified in GB 24848, and selecting L rated powers in each power range section;
s22, setting a step length h, and obtaining N load rate values at 0% -100%:
s23, one rated power value and N load rate values are combined into a group, HTRI software is used for simulation by combining basic parameters, N thermal efficiency values are obtained through output, and L groups of simulation results can be obtained in each power range section;
TABLE 1 correspondence between load factor and thermal efficiency of heating furnace
And S24, fitting each group of results to obtain a linear relation between the heat efficiency and the load factor, wherein each range section has L relations, and the coefficients are subjected to arithmetic mean again to obtain the final linear relation between the heat efficiency and the load factor of the range section.
TABLE 2 fitting relationship for a certain power range segment
| Rated power/kW | Fitting relation |
| P1 | η1＝f(R1) |
| P2 | η2＝f(R2) |
| … | |
| PL | ηL＝f(RL) |
| P1～PL | η＝f(R) |
The method has the advantages that the HTRI software is utilized to simulate the low-load operation condition of the heating furnace to obtain the linear relation between the heat efficiency and the load rate, the influence of the load rate on the heat efficiency is considered, the limit value definition is more scientific and complete, and the large dependence of a coverage rate method on field work data is avoided. The defects in the existing energy efficiency evaluation work are overcome, a new thought is provided for determining the secondary limit value of the heating furnace, the energy-saving effectiveness of the heating furnace is ensured, and the method has great economic significance for oil fields.
Drawings
FIG. 1 is an overall flow chart of the present invention
FIG. 2 is a linear fitting relationship between load factor and thermal efficiency of the example
Detailed description of the invention
While the embodiments of the present invention will be described and illustrated in detail with reference to the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.
For the convenience of understanding the embodiments of the present invention, the following detailed description will be given by way of example with reference to the accompanying drawings, and the embodiments are not limited to the embodiments of the present invention.
As shown in fig. 1, the method for determining the secondary energy efficiency limit value of the heating furnace provided by this embodiment is characterized by including the following steps:
and S1, collecting the working data of the heating furnace in the oil field, and determining the basic parameters of the heating furnace in the energy-saving state.
In this example, the basic parameters of the study subject of a tube furnace for a certain oil field are as follows.
TABLE 3 basic data sheet
S2, simulating the working condition of the heating furnace by using HTRI software to obtain the corresponding relation between the load factor and the efficiency limit value, and performing linear fitting on the heat efficiency and the load factor, wherein the specific implementation method comprises the following steps:
s21, dividing the tube furnace according to the rated power according to the method specified in GB 24848, and selecting four rated power values of 200kW, 30okW, 400kW and 500kW in the range of 200kW to 500 kW;
s22, setting a step length of 5 percent and obtaining 19 load rate values at 0 to 100 percent;
s23, one rated power value and 19 load factor values are combined into one group, HTRI software is used for simulation by combining basic parameters, a thermal efficiency limit value is obtained by output, and four groups of output results are shown in a table 4;
TABLE 4 corresponding relationship between load factor and thermal efficiency of tubular heating furnace
S24, fitting each group of results to obtain a relation between the heat efficiency and the load factor, wherein the four relations in the range of 200 kW-500 kW are obtained, and the coefficients are arithmetically averaged again to obtain the final relation between the heat efficiency and the load factor in the range, which is shown in Table 5.
Table 5200-500 kW range fitting relational expression
| Rated power/kW | Fitting relation |
| 500 | η＝-0.0022R2+0.3189R+80.39 |
| 400 | η＝-0.0025R2+0.3455R+79.99 |
| 300 | η＝-0.0022R2+0.3277R+79.73 |
| 200 | η＝-0.0021R2+0.3227R+79.59 |
| 200～500 | η＝-0.0023R2+0.3287R+80.07 |
And S3, evaluating energy saving by using a relational expression between the thermal efficiency and the load factor. An evaluation relational expression eta of-0.0023R according to a range of 200kW to 500kW2And+ 0.3287R +80.07, substituting the load rate value to obtain the corresponding thermal efficiency limit value, if the measured thermal efficiency is greater than the limit value, the heating furnace reaches the energy-saving requirement, otherwise, the heating furnace does not. Some evaluation results are shown in Table 6.
TABLE 6 evaluation results of tube furnace
Finally, although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is to be covered by the appended claims.
Claims (1)
1. A method for determining a secondary energy efficiency limit value of a heating furnace is characterized by comprising the following steps: the method comprises the following steps:
s1, collecting oil field working data, and determining basic parameters of the heating furnace in an energy-saving state;
s2, simulating the working condition of the heating furnace by using HTRI software to obtain the corresponding relation between the load factor and the efficiency limit value, and performing linear fitting on the heat efficiency and the load factor;
s21, dividing the tube furnace according to the rated power according to the method specified in GB 24848, and selecting L rated powers in each power range section;
s22, setting step length h, and obtaining N load rate values at 0% -100%;
s23, one rated power value and N load factor values are combined into a group, HTRI software is used for simulation by combining basic parameters, N thermal efficiency limit values are obtained through output, and L groups of simulation results can be obtained in each power range section;
TABLE 1 correspondence between load factor and thermal efficiency of heating furnace
S24, each group of results is fitted to obtain a relation between the heat efficiency and the load factor, each range section has L relations, and the coefficients are subjected to arithmetic mean again to obtain the final relation between the heat efficiency and the load factor of the range section;
TABLE 2 fitting relationship for a certain power range segment
And S3, evaluating energy saving by using a relational expression between the thermal efficiency and the load factor.
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| JPS60120185A (en) * | 1983-11-30 | 1985-06-27 | 住友金属工業株式会社 | Method of controlling combustion of heating furnace |
| CN104975147A (en) * | 2015-07-06 | 2015-10-14 | 安徽索特汽车零部件有限公司 | Heat treatment technology of automobile outer joint bell-shaped shell |
| CN207439209U (en) * | 2017-09-30 | 2018-06-01 | 中国石油天然气股份有限公司 | A kind of oil gas field duplex separated heating device |
| CN109146274A (en) * | 2018-08-09 | 2019-01-04 | 中海石油气电集团有限责任公司 | A kind of plant gas synthetical condition assessment method based on entropy weight |
| CN109269117B (en) * | 2018-08-10 | 2020-10-02 | 中国石油天然气股份有限公司 | Method for determining operating state of heating furnace |
| CN109857984B (en) * | 2019-01-22 | 2022-11-29 | 新奥数能科技有限公司 | Regression method and device of boiler load rate-efficiency curve |
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