CN114757126A - Hydrogen network reconstruction method based on random pinch point - Google Patents
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 title 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 173
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 36
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- 238000005457 optimization Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
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Abstract
The invention provides a hydrogen network reconstruction method based on random pinch points. Firstly, extracting the flow and the hydrogen purity of each hydrogen supply and hydrogen utilization equipment stream in a hydrogen energy system; taking the flow rate of the stream as an abscissa and the purity of the hydrogen as an ordinate, and arranging the purities of the hydrogen source and the hydrogen trap from large to small to make a flow-concentration composite curve chart; drawing a residual hydrogen map by taking the hydrogen purity as an ordinate and the residual hydrogen amount as an abscissa according to the flow-concentration composite curve; dividing a hydrogen energy system into different operating conditions according to the influence of randomness, wherein each operating condition is divided into time intervals according to the starting time and the stopping time of a stream as an operating cycle; different streams exist in each interval, and pinch point matching is carried out to obtain a plurality of pinch points; selecting a pinch point corresponding to the lowest hydrogen purity as a pinch point of the whole hydrogen network; and finally, optimizing the hydrogen network by using a superstructure optimization method with the optimal economy as a target.
Description
Technical Field
The invention belongs to the technical field of process system integration, and particularly relates to a hydrogen network reconstruction method based on random pinch points.
Background
The installed capacity of the new energy is gradually improved, and an electrolytic cell in the large hydrogen energy generation system of the new energy is put into operation and a generator set is shut down, otherwise the electrolytic cell is possibly shut down, the generator set is put into operation and the hydrogen energy supply system is insufficient in electric energy and the like. In order to cope with the influence of randomness of high-proportion new energy, the situation that the hydrogen energy systems under different working conditions are in different operation modes is a normal state, and hydrogen traps and even hydrogen sources in an original hydrogen network are changed; even under the same working condition or operation mode, the random fluctuation of the new energy source can cause the hydrogen source and the hydrogen trap of the coupled hydrogen energy system and the parameters of the hydrogen source and the hydrogen trap to change.
Disclosure of Invention
The invention aims to consider the influence of high-proportion random new energy, divide a hydrogen energy system into different operating conditions on the basis of an original hydrogen pinch point determination method, divide time intervals according to the starting and stopping time of a stream, re-perform pinch point analysis on a hydrogen network after green hydrogen is introduced, and optimize the hydrogen network by using a superstructure optimization method and considering grade pressure division and aiming at optimal economy.
The invention discloses a hydrogen network reconstruction method based on random pinch points, which comprises the following steps:
(1) identifying hydrogen sources and hydrogen traps in a hydrogen network and extracting data;
(2) dividing a hydrogen energy system into different working conditions and then dividing time intervals;
(3) making a flow-concentration composite curve chart according to the flow and the concentration of the hydrogen source and the hydrogen trap;
(4) analyzing the part which can be optimized in the hydrogen network by using a flow-concentration composite curve chart, calculating the residual hydrogen amount and making a residual hydrogen map;
(5) different streams exist in each time interval, pinch point matching is carried out to obtain a plurality of pinch points, and the pinch point corresponding to the lowest hydrogen purity is selected as the pinch point of the whole hydrogen network;
(6) and optimizing the hydrogen network by using a superstructure optimization method and considering pressure grade layering with the aim of optimal economy.
Further, the step (2) comprises the following steps:
firstly, dividing a hydrogen energy system into different working conditions based on the randomness of new energy power generation and hydrogen production; and each working condition divides the time interval by taking the starting time and the stopping time of the flow as an operation period.
Further, in the step (3), the flow rate of the stream is taken as an abscissa, the hydrogen purity is taken as an ordinate, and the flow rate of each hydrogen source and each hydrogen trap is represented by a horizontal line segment.
Further, the performing pinch point matching in the step (5) comprises the following steps:
(1) according to the residual hydrogen map, when the residual hydrogen amount is 0, the intersection point of the line segment in the residual hydrogen map and the Y axis of the residual hydrogen map is the pinch point obtained under the working condition;
(2) superposing the residual hydrogen maps of each working condition to obtain a plurality of pinch points;
(3) and selecting the point with the lowest hydrogen purity corresponding to the pinch point obtained in the previous step as the pinch point of the whole hydrogen energy system.
Further, the step (6) comprises the following steps:
(1) dividing a device related to hydrogen into a hydrogen source and a hydrogen trap, layering pressure grades, dividing the pressure grades in each layer of pressure grade, and establishing all connections from the hydrogen source to the hydrogen trap;
(2) considering economic influence factors including hydrogen supply cost and compressor electricity cost, establishing an objective function by taking optimal economy as a target:
wherein C is the total cost; fj,kIs the flow from hydrogen source j to hydrogen trap k; cjHydrogen price for hydrogen source j; ceThe unit price is used for the compressor; pj,kEnergy consumption for the compressor; alpha is a unit conversion coefficient;
constraints include hydrogen trap/source constraints, PSA constraints, impurity constraints, and compressor constraints.
Has the advantages that:
the method comprises the steps of considering the influence of high-proportion random new energy, dividing a hydrogen energy system into different operation working conditions on the basis of an original hydrogen pinch point determining method, dividing time intervals according to the starting time and the stopping time of a stream, re-performing pinch point analysis on a hydrogen network after green hydrogen is introduced, and optimizing the hydrogen network by using a superstructure optimizing method and considering rank pressure division and aiming at optimal economy.
Drawings
FIG. 1 is a flow chart of a random pinch-based hydrogen network reconstruction method of the present invention;
FIG. 2 is a time interval plot of the present invention;
FIG. 3 is a pinch point matching flow chart of the present invention;
FIG. 4 is a hypergraph diagram of a hydrogen network containing pressure ratings of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the method for reconstructing a hydrogen network based on random pinch points according to the present invention comprises the following steps:
(1) identifying hydrogen sources and hydrogen traps in a hydrogen network and extracting data;
drawing a hydrogen gas pinch diagram, and finding out all hydrogen production units and hydrogen consumption units in a hydrogen energy system, wherein the hydrogen production units can provide hydrogen gas as hydrogen sources, and the hydrogen consumption units can provide hydrogen gas as hydrogen traps by other devices; and counting the hydrogen flow and purity data of all hydrogen sources and hydrogen traps.
(2) As shown in fig. 2, the hydrogen energy system is divided into different working conditions and then divided into time intervals;
considering the influence of high-proportion random new energy, the condition that the operation modes of the hydrogen energy system are different under different working conditions is a normal state, the hydrogen energy system is divided into different operation working conditions, and each working condition is divided into time intervals according to the starting time and the stopping time of the flow as an operation cycle. A different stream is present in each time interval.
(3) Making a flow-concentration composite curve according to the flow and the concentration of the hydrogen source and the hydrogen trap;
the flow rate of the stream was taken as the abscissa and the hydrogen purity as the ordinate. The flow rates of each hydrogen source, hydrogen trap, are represented by horizontal line segments, which can be moved left and right. And arranging hydrogen sources and hydrogen traps according to the hydrogen purity from large to small, and respectively combining line segments obtained in the previous step to obtain a flow-concentration composite curve chart.
(4) Analyzing the part which can be optimized in the hydrogen network by using a flow-concentration composite curve chart, calculating the residual hydrogen amount and making a residual hydrogen map;
in the prepared flow-concentration composite curve chart, a hydrogen source curve and a hydrogen trap curve can form a closed area, the hydrogen source curve represents the surplus hydrogen in the closed area on the hydrogen trap curve, and a line segment is extended rightwards in the remaining hydrogen diagram by the length equal to the integration result; if the hydrogen trap curve is on, it indicates that the hydrogen flow provided by the hydrogen source cannot meet the demand of the hydrogen trap, i.e. the hydrogen is deficient, and therefore the segment is extended to the left. The area of the closed region represents the specific flow rate of the hydrogen excess or hydrogen deficiency of the part.
According to the flow-concentration composite curve chart, a residual hydrogen map is drawn by taking the residual hydrogen quantity as an abscissa and the hydrogen purity as an ordinate, and the residual hydrogen quantity is calculated by the following method:
in the formula: s is the residual hydrogen in Nm3/h；yS1Hydrogen purity in% for hydrogen source; y isS2Hydrogen purity of the hydrogen trap is shown in unit of percent; f is the hydrogen flow in the stream.
(5) Different hydrogen streams exist in each time interval, pinch point matching is carried out to obtain a plurality of pinch points, and the pinch point corresponding to the lowest hydrogen purity is selected as the pinch point of the whole hydrogen network;
the pinch point matching flow chart is shown in fig. 3, and a flow-concentration composite curve chart is firstly drawn by taking the flow rate of the stream as an abscissa and the purity of the hydrogen as an ordinate; the hydrogen source and hydrogen trap curves form a closed curve, as shown in the figure, "+" represents hydrogen gas remaining and "-" represents hydrogen gas loss; calculating the residual hydrogen amount based on the graph and drawing a pinch point graph, wherein when the residual hydrogen amount is zero, namely the curve is intersected with the ordinate, the pinch point is the pinch point under the working condition; due to the randomness of the green hydrogen, the flow of the green hydrogen as the hydrogen source with the highest purity can be changed in different time intervals, and different pinch points can be obtained according to the change of the corresponding length on the abscissa defined in the residual hydrogen map. Therefore, the pinch points obtained by the multiple working conditions are different, in order to meet the requirements of all hydrogen traps and utilize the hydrogen source to the maximum extent, according to the principle of pinch point matching, the hydrogen source stream above the pinch point can be directly used, and the hydrogen source stream below the pinch point needs to be treated. The obtained hydrogen among the plurality of pinch points can be utilized, and the pinch point with the lowest hydrogen purity value is selected as the pinch point of the whole hydrogen energy system.
Specifically, it comprises: according to the residual hydrogen map, when the residual hydrogen amount is 0, the intersection point of the line segment of the residual hydrogen map and the Y axis of the residual hydrogen map is the pinch point obtained under the working condition; superposing the residual hydrogen maps of each working condition to obtain a plurality of pinch points; and selecting the point with the lowest hydrogen purity corresponding to the pinch point obtained in the previous step as the pinch point of the whole hydrogen energy system.
(6) Optimizing a hydrogen network by using a superstructure optimization method and considering pressure grade layering with the aim of optimal economy;
as shown in fig. 4, the hydrogen network establishes a superstructure of the hydrogen network, the devices related to the hydrogen gas are divided into hydrogen sources and hydrogen wells, pressure levels are layered at first, and simultaneously, the pressure levels are also divided in each layer of pressure levels, and all connections from the hydrogen sources to the hydrogen wells are established; and (4) considering economic influence factors including hydrogen supply cost, compressor electricity cost and the like, selecting the most appropriate hydrogen supply route, and carrying out structural optimization on the hydrogen network.
Specifically, an objective function is established with the economic optimization as the target:
wherein C is the total cost; fj,kIs the flow from hydrogen source j to hydrogen trap k; cjHydrogen price for hydrogen source j; ceThe unit price is used for the compressor; p isj,kEnergy consumption for the compressor; α is a unit conversion coefficient. Constraints include hydrogen trap/source constraints, PSA constraints, impurity constraints, compressor constraints, and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A hydrogen network reconstruction method based on random pinch points is characterized by comprising the following steps:
(1) identifying hydrogen sources and hydrogen traps in a hydrogen network and extracting data;
(2) dividing a hydrogen energy system into different working conditions and then dividing time intervals;
(3) making a flow-concentration composite curve chart according to the flow and the concentration of the hydrogen source and the hydrogen trap;
(4) analyzing the part which can be optimized in the hydrogen network by using a flow-concentration composite curve chart, calculating the residual hydrogen amount and making a residual hydrogen map;
(5) different streams exist in each time interval, pinch point matching is carried out to obtain a plurality of pinch points, and the pinch point corresponding to the lowest hydrogen purity is selected as the pinch point of the whole hydrogen network;
(6) and optimizing the hydrogen network by using a superstructure optimization method and considering pressure grade layering with the aim of optimal economy.
2. The random pinch-based hydrogen network reconstruction method according to claim 1, characterized in that: the step (2) comprises the following steps:
firstly, dividing a hydrogen energy system into different working conditions based on the randomness of new energy power generation and hydrogen production; and each working condition divides the time interval by taking the starting time and the stopping time of the flow as an operation period.
3. The random pinch point-based hydrogen network reconstruction method of claim 1, wherein: and (3) taking the flow rate of the stream as an abscissa, taking the purity of the hydrogen as an ordinate, and representing the flow rate of each hydrogen source and each hydrogen trap by a horizontal line segment.
4. The random pinch-based hydrogen network reconstruction method according to claim 3, characterized in that: the pinch point matching in the step (5) comprises the following steps:
(1) according to the residual hydrogen map, when the residual hydrogen amount is 0, the intersection point of the line segment in the residual hydrogen map and the Y axis of the residual hydrogen map is the pinch point obtained under the working condition;
(2) superposing the residual hydrogen maps of each working condition to obtain a plurality of pinch points;
(3) and selecting the point with the lowest hydrogen purity corresponding to the pinch point obtained in the previous step as the pinch point of the whole hydrogen energy system.
5. The random pinch-based hydrogen network reconstruction method according to claim 1, characterized in that: the step (6) comprises the following steps:
(1) dividing devices related to hydrogen into a hydrogen source and a hydrogen trap, layering pressure grades, dividing the pressure grade in each layer of pressure grade, and establishing all connections from the hydrogen source to the hydrogen trap;
(2) considering economic influence factors including hydrogen supply cost and compressor electricity cost, establishing an objective function by taking optimal economy as a target:
wherein C is the total cost; fj,kIs the flow from hydrogen source j to hydrogen trap k; cjHydrogen price for hydrogen source j; ceThe unit price is used for the compressor; p isj,kEnergy consumption for the compressor; alpha is a unit conversion coefficient;
constraints include hydrogen trap/source constraints, PSA constraints, impurity constraints, and compressor constraints.
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| CN106485341A (en) * | 2015-08-27 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of optimization method of refinery hydrogen system and its application |
| CN107918280A (en) * | 2017-11-21 | 2018-04-17 | 华东理工大学 | A kind of NETWORK IN REFINERY Optimization Scheduling for pressing from both sides point method and being mixed with superstructure method |
| CN109255461A (en) * | 2017-07-12 | 2019-01-22 | 中国石油化工股份有限公司 | A kind of optimization method and optimization system of hydrogen resources |
| CN110020444A (en) * | 2017-07-12 | 2019-07-16 | 中国石油化工股份有限公司 | A kind of optimization method and system of hydrogen resources |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815227A (en) * | 2006-02-16 | 2006-08-09 | 西安交通大学 | Method for determining grip pure-hydrogen amount and flow for hydrogen network system |
| CA2739467A1 (en) * | 2008-10-10 | 2010-04-15 | Exxonmobil Research And Engineering Company | Optimizing refinery hydrogen gas supply, distribution and consumption in real time |
| CN106485341A (en) * | 2015-08-27 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of optimization method of refinery hydrogen system and its application |
| CN109255461A (en) * | 2017-07-12 | 2019-01-22 | 中国石油化工股份有限公司 | A kind of optimization method and optimization system of hydrogen resources |
| CN110020444A (en) * | 2017-07-12 | 2019-07-16 | 中国石油化工股份有限公司 | A kind of optimization method and system of hydrogen resources |
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