Design method of offshore wind power hydrogen production system
By determining the number of special electrolytic cells, including standard conditions, cache and reserved electrolytic cells in the offshore wind power hydrogen production system, the production fluctuations and power waste caused by wind power changes are solved, and the stable operation of the system and the effective use of wind energy are achieved.
Patent Information
- Application Number
- CN202411795473.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-03-28
AI Technical Summary
Offshore wind power hydrogen production system reduces production or stops when wind power is insufficient, and electricity is wasted when wind power is overcharged, resulting in high investment costs and difficult to effectively utilize the ‘wind’.
By determining the number of hydrogen-making electrolytic cells, including the number of standard electrolytic cells, the number of buffer electrolytic cells and the number of reserved electrolytic cells, the offshore wind power hydrogen production system is designed to ensure that the system can operate stably and effectively utilize wind energy when wind power changes.
It realizes the stability of the production of offshore wind power hydrogen production system and the effective utilization of "discarded wind" while taking into account investment costs and system functionality, and reduces the impact of wind power changes on the system.
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of offshore wind power hydrogen production design and construction, and in particular relates to a design method for an offshore wind power hydrogen production system. Background Art
[0002] At present, green development has become a global mainstream trend, and green technology innovation is becoming an important emerging field in the new round of global industrial revolution and scientific and technological competition. Offshore wind power hydrogen production is one of the main forces of future green development. Green hydrogen produced by wind power can be used as a raw material for the next step of producing green chemical products such as green methanol and green ammonia. However, due to the instability of offshore wind power, it is very likely that when the wind is insufficient, the entire offshore production platform will have problems such as reduced production or even shutdown due to power supply shortages. At the same time, when the wind is very sufficient, the platform will be unable to absorb the abundant wind power produced, resulting in the waste of this part of electricity and the occurrence of "wind abandonment".
[0003] For such offshore facilities that use wind power to produce green chemical products, the rationality of wind power utilization in the wind farm in the operating sea area should be considered. If the number of hydrogen production equipment is simply increased, wind energy can indeed be fully absorbed, but it will make the space of production facilities difficult to control, and the corresponding investment cost will also increase significantly. Simply increasing the number of hydrogen production equipment is also likely to cause a large number of hydrogen production equipment to be idle when the wind farm is insufficient, resulting in a waste of investment. However, if the number of hydrogen production equipment is excessively controlled, although costs can be saved, when the wind is insufficient, the production of green chemical products will be severely restricted, and it will be difficult to make good use of the "wind abandonment" situation.
[0004] The core equipment of the offshore wind power hydrogen production system is the hydrogen production electrolyzer. The design of the entire system is based on the hydrogen production electrolyzer. If the number of hydrogen production electrolyzers is determined, the key design information of the entire system can be determined, and the subsequent system design is relatively conventional. The reasonable determination of the number of hydrogen production electrolyzers in the system helps to reasonably control the investment cost of the entire system and the "wind abandonment" absorption.
[0005] In view of the above situation, considering fully guaranteeing the output of offshore production facilities and simultaneously considering the utilization of "abandoned wind", a design method can be used to design the offshore wind power hydrogen production system so that it can meet the usage requirements analyzed above. Summary of the invention
[0006] In order to solve the above problems, the present invention provides a design method for an offshore wind power hydrogen production system, the technical solution adopted is: A design method for an offshore wind power hydrogen production system requires first determining the number of electrolyzers, which is composed of the number of standard electrolyzers, the number of cache electrolyzers, and the number of reserved electrolyzers. The specific determination method is as follows: S1: Number of electrolytic cells under standard conditions N1: N1 = V x δ / n in: N1 is the number of electrolytic cells under standard conditions, units; V is the standard hydrogen consumption of the production facility, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; S2: Number of cache electrolytic cells N2: N2 = V x T xδ / t / n in: N2 is the number of cache electrolytic cells, units; V is the standard hydrogen consumption of the production facility, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; T is the maximum continuous wind-free time in the wind farm in the operating sea area, h (obtained from wind farm data); t is the cache hydrogen production time, h; when T≤12h, t is 30, when 12<T≤24, t is 24, when 24<T≤48, t is 18; S3: Number of reserved electrolytic cells N3: N3 = V1 x T x δ / t / n N3 is the number of reserved electrolytic cells, units; V1 is the hydrogen consumption of hydrogen power generation equipment, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; T is the maximum continuous time without wind power in the wind farm in the operating sea area, and h is obtained based on the wind farm data; t is the cache hydrogen production time, h; When T≤12h, t is 30, when 12<T≤24, t is 24, when 24<T≤48, t is 18; S4: The total number of hydrogen production electrolyzers required is: N = N1 + N2 + N3.
[0007] The above-mentioned design method of an offshore wind power hydrogen production system further, if the production facilities are not equipped with other hydrogen-using equipment such as hydrogen fuel cells, N3 is 0.
[0008] The present invention can ensure the rationality of the design of the offshore wind power hydrogen production system while taking into account both investment cost and system functionality. DETAILED DESCRIPTION
[0009] A design method for an offshore wind power hydrogen production system, wherein the number of electrolyzers is mainly composed of three parts, and the specific method for determining the number of electrolyzers of the three parts is as follows: Number of electrolytic cells under standard conditions N1: Standard conditions refer to the standard working conditions when the offshore green product production facility produces green chemical products at 100% load. At this time, the consumption of raw hydrogen is a constant standard value V (determined according to the production facility, Nm3 / h). The number of electrolytic cells in this part is calculated according to the following formula: N1 = V x δ / n in: N1 is the number of electrolytic cells under standard conditions, units; V is the standard hydrogen consumption of the production facility, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, with optional options of 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h. Number of cache electrolyzers N2: When the wind power in the operating sea area is extremely sufficient, it is necessary to consider configuring additional cache electrolyzers to use the abundant wind energy to pre-prepare and store hydrogen to ensure that when the wind power in the operating sea area is insufficient, the production facilities can continue to be supplied with hydrogen to ensure its standard production. The number of electrolyzers in this part is calculated according to the following formula: N2 = V x T xδ / t / n in: N2 is the number of cache electrolytic cells, units; V is the standard hydrogen consumption of the production facility, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; T is the maximum continuous wind-free time in the wind farm in the operating sea area, h (obtained from wind farm data); t is the cache hydrogen production time, in hours. When T≤12h, t is 30, when 12<T≤24, t is 24, and when 24<T≤48, t is 18.
[0010] Reserved electrolyzer quantity N3: When the production facility is equipped with equipment to generate electricity using hydrogen when wind power is insufficient, such as hydrogen fuel cells, the electrolyzers configured to cache hydrogen when wind power is sufficient. The number of electrolyzers in this part is calculated as follows: N3 = V1 x T x δ / t / n; N3 is the number of reserved electrolytic cells, units; V1 is the hydrogen consumption of hydrogen power generation equipment, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; T is the maximum continuous wind-free time in the wind farm in the operating sea area, h (obtained from wind farm data); t is the cache hydrogen production time, in hours. When T≤12h, t is 30, when 12<T≤24, t is 24, and when 24<T≤48, t is 18.
[0011] The number of hydrogen production electrolyzers in each part is calculated through the above description, and the total number of hydrogen production electrolyzers required in the designed wind power hydrogen production system is obtained as follows: N = N1 + N2 + N3 If the production facilities are not equipped with other hydrogen-using equipment such as hydrogen fuel cells, N3 is 0. The value of the standard specification n of the hydrogen production capacity of a single electrolyzer should be unified when calculating N1, N2 and N3, and different specifications cannot be selected. If the values of N1, N2 and N3 are non-integer after calculation, the decimal part is discarded and the integer part + 1 is rounded to the integer value.
[0012] Through the above calculation, the number of hydrogen production electrolyzers, the core equipment of the target offshore wind power hydrogen production system, can be obtained, and then the subsequent related supporting equipment and system design can be carried out. Among them, the cache electrolyzer equipment can be used as a "wind abandonment" consumption equipment on the production facility.
[0013] Taking a green chemical product production facility (floating platform) of offshore wind power as an example, the product produced is methanol, with an annual output of 200,000 tons. The hydrogen consumption of the production module is 54,000Nm3 / h. The maximum continuous windless time of the wind farm in the operating sea area is 19 hours. The facility is equipped with hydrogen fuel cells, and the total hydrogen consumption of the hydrogen fuel cells is 11,000Nm3 / h. Design a hydrogen production system based on the above information and calculate the number of hydrogen production electrolyzers in the system: N1 = V x δ / n = 54000 x 1.1 / 2000 = 29.7 (take 30) in: V is 54000 Nm3 / h.
[0014] δ is taken as 1.1.
[0015] n is 2000Nm3 / h. N2 = V x T xδ / t / n = 54000 x 19 x 1.1 / 24 / 2000 = 23.51 (take 24) in: V is 54000Nm3 / h.
[0016] δ is taken as 1.1.
[0017] n is selected as 2000Nm3 / h.
[0018] T is 19 h.
[0019] t is 24.
[0020] N3 = V1 x T x δ / t / n = 11000 x 19 x 1.1 / 24 / 2000 = 4.79 (take 5) V1 is 11000Nm3 / h.
[0021] δ is taken as 1.1.
[0022] n is selected as 2000Nm3 / h.
[0023] T is 19h.
[0024] t is 24.
[0025] The number of hydrogen production electrolyzers in each part is calculated through the above description, and the total number of hydrogen production electrolyzers required in the designed wind power hydrogen production system is obtained as follows: N = N1 + N2 + N3 = 30 + 24 + 5 = 59 units.
Claims
1. A design method for an offshore wind power hydrogen production system, characterized in that: The number of electrolytic cells must be determined first. The number of electrolytic cells consists of the number of standard electrolytic cells, the number of cache electrolytic cells, and the number of reserved electrolytic cells. The specific determination method is as follows: S1: Number of electrolytic cells under standard conditions N1: N1 = V x δ / n in: N1 is the number of electrolytic cells under standard conditions, units; V is the standard hydrogen consumption of the production facility, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; S2: Number of cache electrolytic cells N2: N2 = V x T xδ / t / n in: N2 is the number of cache electrolytic cells, units; V is the standard hydrogen consumption of the production facility, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; T is the maximum continuous wind-free time in the wind farm in the operating sea area, h (obtained from wind farm data); t is the cache hydrogen production time, h; when T≤12h, t is 30, when 12<T≤24, t is 24, when 24<T≤48, t is 18; S3: Number of reserved electrolytic cells N3: N3 = V1 x T x δ / t / n N3 is the number of reserved electrolytic cells, units; V1 is the hydrogen consumption of hydrogen power generation equipment, Nm3 / h; δ is the redundancy coefficient. When the annual output of the production facility is 100,000 tons or less (including 100,000 tons), δ is 1.05; when the annual output of the production facility is 100,000 tons to 200,000 tons (including 200,000 tons), δ is 1.1; when the annual output of the production facility is 200,000 tons to 500,000 tons (including 500,000 tons), δ is 1.17; when the annual output of the production facility is more than 500,000 tons, δ is 1.3; n is the standard specification of hydrogen production capacity of a single electrolyzer, which can be 1000Nm3 / h, 2000Nm3 / h and 4000Nm3 / h; T is the maximum continuous time without wind power in the wind farm in the operating sea area, and h is obtained based on the wind farm data; t is the cache hydrogen production time, h; When T≤12h, t is 30, when 12<T≤24, t is 24, when 24<T≤48, t is 18; S4: The total number of electrolyzers required for hydrogen production is: N = N1 + N2 + N3.
2. The design method of an offshore wind power hydrogen production system according to claim 1, characterized in that: If the production facilities are not equipped with hydrogen fuel cells or other hydrogen-using equipment, N3 is 0.