System and method for increasing comprehensive heat energy utilization rate in hot-process phosphoric acid production process

Abstract

The invention discloses a system and method for increasing the comprehensive heat energy utilization rate in the hot-process phosphoric acid production process, and relates to the field of hot-process phosphoric acid production. The system comprises a reaction tower, an overheater and a hydration tower which are sequentially connected. A plurality of first heat exchange pipes are arranged in the reaction tower, and a steam pocket is arranged outside the reaction tower. The first heat exchange pipes communicate with the steam pocket. After media in the first heat exchange pipes absorb the combustion reaction heat of yellow phosphorus in the reaction tower, a steam and water mixture is formed and enters the steam pocket, steam and water separation is then conducted through the steam pocket, and saturated steam is formed. The overheater is connected with the steam pocket, and the steam pocket inputs the saturated steam into the overheater. The overheater is used for absorbing heat of high-temperature P2O5 smoke discharged by the reaction tower, the saturated steam is heated, overheat steam is formed, and meanwhile low-temperature P2O5 smoke is produced. By means of the system and method, the comprehensive heat energy utilization rate in the hot-process phosphoric acid is effectively increased, meanwhile, consumption of water in the technology is reduced, and water resources are saved.

Description

technical field [0001] The invention relates to the field of phosphoric acid production, in particular to a system and method for improving the comprehensive utilization rate of heat energy in the production process of thermal phosphoric acid. Background technique [0002] Phosphorus is not only the most important element in nucleic acid, protein, and cell membrane genetic life substances, but also an indispensable substance in fertilizer, feed, and food additives. It is widely used in the fields of materials, pesticides, medicine, food, metallurgy, and chemical industry. Therefore, , Phosphorus chemical industry has become an important part of the modern chemical industry. [0003] The phosphating industry includes two major industries: basic phosphorus chemical industry and fine phosphorus chemical industry. Basic phosphorus chemical industry refers to the industry that uses chemical reactions to produce phosphorus-containing basic chemicals (ie phosphoric acid). Phosphor...

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Problems solved by technology

[0009] In order to utilize the heat generated by the combustion of yellow phosphorus, a circle of heat exchange tubes with water as the medium is usually arranged around the wall of the combustion tower for heat exchange. The water medium can generate saturated steam after absorbing heat. 1 ton of yellow phosphorus can obtain about 5 tons of low-pressure saturated steam, and the recovered heat is lower than 60% of the heat released in actual production, and the heat energy utilization efficiency is low. It is necessary to produce economic benefits through other means such as power generation. Due to the low efficiency of saturated steam power generation, it cannot produce greater economic benefits compared with the investment in power generation equipment, and the cost cannot be recovered in a short time. Therefore, most phosphoric acid production enterprises choose to directly dissipate heat

[0010] At the same time, high temperature P 2 o 5 When entering the hydration tower, P 2 o 5 The temperature of the hydration reaction in the tower is relatively high, and the temperature of the tower wall needs to be continuously cooled by water cooling, which not only causes a large amount of water resource consumption, but also causes a serious waste of heat energy

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