A method for determining the process execution sequence in hydrogen network hydrogen saving

Abstract

The invention belongs to the field of hydrogen network technology, and discloses a new method for determining the execution order of processes in the hydrogen saving of hydrogen networks. First, the current source streams are used to satisfy each unexecuted process respectively by using the source stream distribution method, and sequentially according to the amount of external source streams or The principle that the process with the largest amount of source stream consumption after purification is executed first is used to determine the execution order of the process; the determined process execution order is combined with the iterative method of designing a fixed hydrogen concentration model after purification and a hydrogen network with a given impurity removal rate model, and respectively design Two models of multi-impurity hydrogen networks. The design method of the present invention can minimize the consumption of external source streams. For the former model, the consumption of external source streams, the consumption of source streams after purification and the discharge of fuel gas have been reduced by 1.60%, 3.71% and 2.00% respectively; for the latter model For this model, the reductions were 4.05%, 0.43%, and 4.94%, respectively, in the case of slightly lower impurity concentrations in the source stream after purification.

Description

technical field [0001] The invention belongs to the technical field of hydrogen networks, and in particular relates to a method for determining the execution order of processes in the hydrogen saving of hydrogen networks. Background technique [0002] Hydrogen has become a very important resource at present. A large amount of hydrogen is needed in the hydrogenation process of petroleum refining and chemical enterprises. With the heavy and inferior quality of crude oil and the implementation of increasingly stringent industrial environmental protection standards and related legislation, the demand for hydrogen in the hydrogenation process continues to increase . When there are multiple devices such as hydrogen consumption, hydrogen production, and hydrogen purification units, and there are close connections between these devices, the above-mentioned devices are often regarded as a hydrogen network. [0003] Compared with the hydrogen network that only considers reuse, schol...

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Problems solved by technology

However, this qualitative conclusion cannot give a hydrogen consumption target; Liu et al. proposed a hydrogen network purification unit model to evaluate the feasibility of the purification scheme; Agrawal et al. proposed a diagram that does not require iteration based on the concept of the limit composite curve method, by constructing a limiting hydrogen distribution diagram to discuss the hydrogen network with purification units, and give a method to calculate the target value of hydrogen consumption; Foo et al. proposed a method called gas cascade analysis (GCA) to calculate the available Hydrogen target, and discussed the situation with two purification units; Ng et al. proposed an automation-based target pinch technology for the design of reuse hydrogen network, and Ng et al. improved it to study the purification problem of hydrogen stream ; Zhang et al. proposed a graphical method to obtain the pinch concentration and hydrogen consumption target of the hydrogen network of the purification unit through the impurity load-flow rate composite curve

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