CN114757126B - Hydrogen network reconstruction method based on random pinch points - Google Patents
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 218
- 239000001257 hydrogen Substances 0.000 title claims abstract description 218
- 238000000034 method Methods 0.000 title claims abstract description 24
- 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 169
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 48
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 238000005457 optimization Methods 0.000 claims abstract description 8
- 238000010586 diagram Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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 flow in a hydrogen energy system; taking the flow of the flow as an abscissa and the purity of the hydrogen as an ordinate, arranging the purities of a hydrogen source and a hydrogen trap from large to small, and making a flow-concentration composite graph; making a residual hydrogen graph by taking the hydrogen purity as an ordinate and the residual hydrogen amount as an abscissa according to the flow-concentration composite graph; dividing the hydrogen energy system into different operation conditions according to the influence of randomness, wherein each condition is used for dividing time intervals according to the start-stop time of a flow as an operation period; different streams exist in each interval, and pinch point matching is carried out to obtain a plurality of pinch points; selecting a clamping point corresponding to the lowest hydrogen purity as a clamping point of the whole hydrogen network; finally, optimizing the hydrogen network by using a super-structure optimization method with the aim of optimizing the economy.
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 new energy is gradually increased, and the electrolytic tank in the new energy large hydrogen energy generation system is put into operation, the generator set is stopped, otherwise, the electrolytic tank may be stopped, the generator set is put into operation, the electric energy of the hydrogen energy supplementing system is insufficient, and the like. In order to cope with the influence of high-proportion new energy randomness, the condition that the operation modes of the hydrogen energy system are different under different working conditions is a normal state, and a hydrogen trap and even a hydrogen source 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 possibly cause the change of the hydrogen source, the hydrogen trap, the parameters thereof and the like of the coupled hydrogen energy system.
Disclosure of Invention
The invention aims to provide a method for optimizing a hydrogen network by dividing a hydrogen energy system into different operation working conditions based on an original hydrogen pinch point determination method in consideration of the influence of high-proportion random new energy, dividing time intervals according to start and stop time of a flow stream, re-analyzing the pinch point of the hydrogen network after green hydrogen is introduced, and optimizing the hydrogen network by taking the classification of grade pressure into consideration by utilizing a super-structure optimization method and taking the economical efficiency as an aim.
The invention relates to a hydrogen network reconstruction method based on random pinch points, which comprises the following steps:
(1) Identifying a hydrogen source and a hydrogen trap in a hydrogen network and extracting data;
(2) Dividing the hydrogen energy system into different working conditions and then dividing time intervals;
(3) Manufacturing a flow-concentration composite graph according to the flow and the concentration of the hydrogen source and the hydrogen trap;
(4) Analyzing an optimizable part in a hydrogen network by using a flow-concentration composite graph, calculating residual hydrogen quantity and manufacturing a residual hydrogen graph;
(5) Different streams exist in each time interval, pinch point matching is carried out, a plurality of pinch points are obtained, and the pinch point corresponding to the lowest hydrogen purity is selected as the pinch point of the whole hydrogen network;
(6) And (3) optimizing the hydrogen network by taking the pressure grade layering into consideration and taking the economical efficiency as an optimal target by using a super-structure optimization method.
Further, the step (2) includes the following steps:
firstly, dividing a hydrogen energy system into different working conditions based on randomness of new energy power generation and hydrogen production; each working condition is divided into time intervals according to the start-stop time of the flow as an operation period.
Further, the flow rate of the flow of each hydrogen source and each hydrogen trap are represented by a horizontal line segment in the step (3) with the flow rate of the flow as an abscissa and the purity of the hydrogen as an ordinate.
Further, the performing the pinch point matching in the step (5) includes the following steps:
(1) According to the residual hydrogen diagram, when the residual hydrogen amount is 0, the intersection point of the line segment in the residual hydrogen diagram and the Y axis of the residual hydrogen diagram is the clamping point obtained under the working condition;
(2) Overlapping the residual hydrogen graphs of each working condition to obtain a plurality of clamping points;
(3) And selecting the point with the lowest hydrogen purity corresponding to the clamping point obtained in the last step as the clamping point of the whole hydrogen energy system.
Further, the step (6) includes the following steps:
(1) Dividing the hydrogen-related device into a hydrogen source and a hydrogen trap, layering the pressure levels, dividing the pressure levels in each pressure level at the same time, and establishing all connections of the hydrogen source to the hydrogen trap;
(2) Taking into consideration economic influence factors including hydrogen supply cost and compressor electricity cost, establishing an objective function with the optimal economical efficiency as a target:
wherein, C is the total cost; f (F) j,k Is the flow from the hydrogen source j to the hydrogen trap k; c (C) j The hydrogen price for hydrogen source j; c (C) e The unit price for the compressor; p (P) j,k Energy is consumed for the compressor; alpha is a unit conversion coefficient;
constraints include hydrogen trap/hydrogen source constraints, PSA constraints, impurity constraints, and compressor constraints.
The beneficial effects are that:
the method is characterized in that the influence of high-proportion random new energy is considered, on the basis of an original hydrogen pinch point determination method, a hydrogen energy system is divided into different operation working conditions, time intervals are divided according to start-stop time of a flow, pinch point analysis of a hydrogen network after green hydrogen is introduced is carried out again, a super-structure optimization method is utilized, grade pressure division is considered, and the hydrogen network is optimized with the aim of optimizing 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 division diagram of the present invention;
FIG. 3 is a pinch point matching flow chart of the present invention;
FIG. 4 is a chart of the hydrogen network hypergraph of the present invention containing pressure ratings.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the method for reconstructing the hydrogen network based on the random pinch points comprises the following steps:
(1) Identifying a hydrogen source and a hydrogen trap in a hydrogen network and extracting data;
drawing a hydrogen pinch diagram, namely finding out all hydrogen generating units and hydrogen consuming units in a hydrogen energy system, wherein the hydrogen generating units can be used as hydrogen sources to provide hydrogen, and the hydrogen consuming units are used as hydrogen traps to provide hydrogen by other devices; the hydrogen flow and purity data for all hydrogen sources and traps were counted.
(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 used for dividing time intervals according to the start-stop time of a flow as an operation period. There is a different flow per time interval.
(3) Making a flow-concentration composite graph according to the flow and the concentration of the hydrogen source and the hydrogen trap;
the flow rate of the stream is plotted on the abscissa and the purity of the hydrogen is plotted on the ordinate. The flow rate of each hydrogen source and each hydrogen trap is represented by a horizontal line segment, and the line segment can move left and right. And arranging a hydrogen source and a hydrogen trap from large to small according to the purity of the hydrogen, and respectively combining the line segments obtained in the previous step to obtain a flow-concentration composite graph.
(4) Analyzing an optimizable part in a hydrogen network by using a flow-concentration composite graph, calculating residual hydrogen quantity and manufacturing a residual hydrogen graph;
in the prepared flow-concentration composite graph, a hydrogen source curve and a hydrogen trap curve form a closed area, the hydrogen source curve represents the hydrogen surplus of the closed area on the hydrogen trap curve, and the length of the line segment is prolonged rightwards in the residual hydrogen graph and is equal to the integral result; if the curve of the hydrogen trap is on top, it means that the flow of hydrogen provided by the hydrogen source cannot meet the requirement of the hydrogen trap, that is, the hydrogen is deficient, so the line segment is extended leftwards. The area of the enclosed region represents the specific flow size of the portion of hydrogen excess or hydrogen deficiency.
And drawing a residual hydrogen graph by taking the residual hydrogen amount as an abscissa and the hydrogen purity as an ordinate according to the flow-concentration composite graph, wherein the residual hydrogen amount calculating method comprises the following steps of:
wherein: s is the residual hydrogen amount, and the unit is Nm 3 /h；y S1 The purity of hydrogen source hydrogen is expressed as a unit; y is S2 The purity of hydrogen is hydrogen in hydrogen trap, and the unit is; f is the hydrogen flow in the stream.
(5) Different hydrogen flows exist in each time interval, pinch point matching is carried out, a plurality of pinch points are obtained, 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 firstly, a flow-concentration composite graph is made by taking the flow of a flow as an abscissa and the purity of hydrogen as an ordinate; the hydrogen source and hydrogen trap curves form a closed curve, as shown in the figure, "+" represents hydrogen remaining, and "-" represents hydrogen loss; calculating residual hydrogen amount based on the graph, and drawing a pinch point diagram, wherein when the residual hydrogen amount is zero, namely the curve is intersected with the ordinate, the pinch point diagram is a pinch point under the working condition; because of the randomness of the green hydrogen, the green hydrogen is used as the hydrogen source with the highest purity in different time intervals, and the flow rate of the green hydrogen is changed, so that different pinch diagrams are obtained according to the corresponding length defined on the abscissa in the residual hydrogen diagram. Therefore, the clamping points obtained by the working conditions are different, so that the hydrogen sources are needed to meet the needs of all the hydrogen traps and the hydrogen sources are utilized to the greatest extent, and the hydrogen sources above the clamping points can be directly used according to the clamping point matching principle, and the hydrogen sources below the clamping points need to be treated. The obtained hydrogen among the plurality of clamping points can be utilized, and the clamping point with the lowest hydrogen purity value is selected as the clamping point of the whole hydrogen energy system.
Specifically, it includes: according to the residual hydrogen diagram, when the residual hydrogen amount is 0, the intersection point of the line segment of the residual hydrogen diagram and the Y axis of the residual hydrogen diagram is the clamping point obtained under the working condition; overlapping the residual hydrogen graphs of each working condition to obtain a plurality of clamping points; and selecting the point with the lowest hydrogen purity corresponding to the clamping point obtained in the last step as the clamping point of the whole hydrogen energy system.
(6) Optimizing the hydrogen network by taking pressure grade layering into consideration and taking economical optimization as a target by utilizing a super-structure optimization method;
the hydrogen network is shown in fig. 4, a super structure of the hydrogen network is established, devices related to hydrogen are divided into a hydrogen source and a hydrogen trap, pressure levels are layered firstly, and meanwhile, the pressure levels are also divided in each pressure level, so that all connections from the hydrogen source to the hydrogen trap are established; and taking economic influence factors such as hydrogen supply cost and compressor electricity cost into consideration, selecting the most suitable hydrogen supply route, and carrying out structural optimization on a hydrogen network.
Specifically, an objective function is established with the aim of optimizing economy:
wherein, C is the total cost; f (F) j,k Is the flow from the hydrogen source j to the hydrogen trap k; c (C) j The hydrogen price for hydrogen source j; c (C) e The unit price for the compressor; p (P) j,k Energy is consumed for the compressor; alpha is the unit conversion coefficient. Constraints include hydrogen trap/source constraints, PSA constraints, impurity constraints, compressor constraints, and the like.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The hydrogen network reconstruction method based on the random pinch points is characterized by comprising the following steps of:
(1) Identifying a hydrogen source and a hydrogen trap in a hydrogen network and extracting data;
(2) Dividing the hydrogen energy system into different working conditions and then dividing time intervals;
(3) Manufacturing a flow-concentration composite graph according to the flow and the concentration of the hydrogen source and the hydrogen trap;
(4) Analyzing an optimizable part in a hydrogen network by using a flow-concentration composite graph, calculating residual hydrogen quantity and manufacturing a residual hydrogen graph;
(5) Different streams exist in each time interval, pinch point matching is carried out, a plurality of pinch points are obtained, and the pinch point corresponding to the lowest hydrogen purity is selected as the pinch point of the whole hydrogen network;
(6) And (3) optimizing the hydrogen network by taking the pressure grade layering into consideration and taking the economical efficiency as an optimal target by using a super-structure optimization method.
2. The random pinch-based hydrogen network reconstruction method of claim 1, wherein: the step (2) comprises the following steps:
firstly, dividing a hydrogen energy system into different working conditions based on randomness of new energy power generation and hydrogen production; each working condition is divided into time intervals according to the start-stop time of the flow as an operation period.
3. The random pinch-based hydrogen network reconstruction method of claim 1, wherein: and (3) taking the flow rate of the flow as an abscissa, taking the purity of the hydrogen as an ordinate, and taking a horizontal line segment to represent the flow rate of each hydrogen source and each hydrogen trap.
4. A random pinch-based hydrogen network reconstruction method as defined in claim 3, wherein: the step (5) of performing pinch point matching includes the steps of:
(1) According to the residual hydrogen diagram, when the residual hydrogen amount is 0, the intersection point of the line segment in the residual hydrogen diagram and the Y axis of the residual hydrogen diagram is the clamping point obtained under the working condition;
(2) Overlapping the residual hydrogen graphs of each working condition to obtain a plurality of clamping points;
(3) And selecting the point with the lowest hydrogen purity corresponding to the clamping point obtained in the last step as the clamping point of the whole hydrogen energy system.
5. The random pinch-based hydrogen network reconstruction method of claim 1, wherein: the step (6) comprises the following steps:
(1) Dividing the hydrogen-related device into a hydrogen source and a hydrogen trap, layering the pressure levels, dividing the pressure levels in each pressure level at the same time, and establishing all connections of the hydrogen source to the hydrogen trap;
(2) Taking into consideration economic influence factors including hydrogen supply cost and compressor electricity cost, establishing an objective function with the optimal economical efficiency as a target:
wherein, C is the total cost; f (F) j,k Is the flow from the hydrogen source j to the hydrogen trap k; c (C) j The hydrogen price for hydrogen source j;C e the unit price for the compressor; p (P) j,k Energy is consumed for the compressor; alpha is a unit conversion coefficient;
constraints include hydrogen trap/hydrogen source constraints, PSA constraints, impurity constraints, and compressor constraints.
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| 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 |
| 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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