Petroleum refining plant low-temperature heat utilization micro-grid coupling method

Abstract

The invention discloses a method for coupling low-temperature heat utilization of a petroleum refining plant with a micro-grid. The method is implemented according to the following steps: step 1, identifying and extracting a low-temperature heat source of the petroleum refining plant and then conveying the low-temperature heat source to a low-temperature heat utilization system for recycling; 2, the low-temperature heat utilization system is connected with the micro-grid system of the petroleum refining plant through a coupling unit to charge the micro-grid system of the petroleum refining plant; and step 3, the renewable energy is accessed to the micro-grid system of the petroleum refining plant for power supply. The waste heat of the plant is recovered, so that the operation cost of the micro-grid system is greatly reduced, the technical economy of the micro-grid is greatly improved, and the production and operation cost of the whole petroleum refining plant is also reduced.

Description

technical field [0001] The invention belongs to the technical field of energy recovery in petroleum refineries, and relates to a method for coupling microgrids with low-temperature heat utilization in petroleum refineries. Background technique [0002] Low-temperature waste heat in petroleum refineries refers to the heat generated during the production process that is higher than the storage temperature of oil products, or the heat required by the process itself but not recycled. Generally speaking, the flue gas below 200°C and the heat carried by unused low-pressure steam below 150°C, high-temperature hot water, and process materials that need to be cooled are all considered as low-temperature waste heat. Generally, low-temperature heat in petroleum refineries can be It accounts for about 10% of the energy consumption of the whole plant. A large amount of low-temperature heat in oil refineries is not only low in energy quality, but also scattered in locations. In order to ...

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Problems solved by technology

[0003] Due to problems such as dispersion of heat sources and heat sinks, random matching, mixing of cold and heat, and non-optimization of the same-level utilization network system in low-temperature heat in petroleum refineries, the existing low-temperature heat utilization technology cannot completely recover the low-temperature heat of the entire plant. In addition to the relatively isolated and random system settings, it is usually necessary to set up multiple steam supply and cooling facilities. Not only are the adaptability and adjustment capabilities weak, but many petroleum refineries cannot find suitable heat sinks to reuse low-temperature heat, resulting in the existence of low-temperature heat. Underutilization, especially in summer

Insufficient low-temperature heat recovery and unreasonable overall situation generally exist

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