【正文】 O2, and before ammonia, CO2 must be removed. The CO2 of some enterprises is evacuated, because of the control of the process flow, which destructs the ecological environment and leads to the greenhouse effect, also wastes the valuable resource. A simple process about how to recycle CO2 is provided and designed. Recycling carbon dioxide and producing foodgrade liquid carbon dioxide, waste is turned into treasure. After application, it can play a dual effect of protecting environmental and recycling economy． The production of 50 kt/a of liquid food grade CO2 is designed. Decarbonization of desorption food grade is used to purification liquid CO2. This design has many advantages. For example, its process is short, simple, saving energy, economical, making full use of energy, and so on. The temperature swing adsorption technology to remove water is used in this device, low temperature distillation to remove noncondensable gases． Atmospheric pressure padding rectifying tower and selected interrelated equipment mainly for purification CO2 are designed. In this design, material balance and thermal balance of the entire process flow and the main equipment purification tower are calculated. By calculation, the diameter of the purification tower is selected 800mm, and the height of the purification tower is selected , total feed is 4000 hNm/3 ． Key words： Carbon dioxide 。 年產 5 萬噸食品級 CO2生產工藝的設計 The Process Design of 50kt/a Foodgrade CO2 摘要 ................................................................................................................................................. I Abstract ......................................................................................................................................... II 引言 ................................................................................................................................................ 1 第一章 緒論 ............................................................................................................................. 2 CO2的性質 ....................................................................................................................... 2 CO2的用途 ....................................................................................................................... 2 食品級 CO2的用途 ...................................................................................................... 2 工業(yè)級 CO2的用途 ....................................................................................................... 3 國內 CO2的市場概況 ..................................................................................................... 3 國外 CO2的市場概況 ..................................................................................................... 5 國內 CO2的市場概況 ..................................................................................................... 5 詳述國內 CO2消費分布和結構 ..................................................................................... 7 第二章 工藝流程設計 .......................................................................................................... 9 食品級液態(tài) CO2的生產方法 ......................................................................................... 9 生產食品級液態(tài) CO2的原料氣來源 ........................................................................... 10 石灰窯氣、鍋爐煙道氣等低 CO2 濃度原料氣 ........................................................ 10 合成氨廠變壓吸附脫碳排放的二氧化碳原料氣 ...................................................... 10 高濃度二氧化碳原料氣 ............................................................................................. 11 酒精廠發(fā)酵氣 ............................................................................................................. 11 傳統(tǒng)生產工藝 ................................................................................................................ 11 生產工藝的改進 ............................................................................................................ 12 生產工藝的簡述 ............................................................................................................ 13 生產工藝 系統(tǒng)流 程 ..................................................................................................... 13 生產工藝 過 程 ............................................................................................................. 14 主要生產設備 ................................................................................................................ 14 提純塔 ......................................................................................................................... 14 蒸發(fā)冷凝器 ................................................................................................................. 15 一級脫硫器和二級脫硫器 ......................................................................................... 15 干燥器 ......................................................................................................................... 16 第三章 物料衡算和熱量衡算 .......................................................................................... 17 物料衡算 ......................................................................................................................... 17 提純塔的物料衡算 ..................................................................................................... 19 熱量衡算 ........................................................................................................................ 21 一、二級預冷器熱量衡算 ......................................................................................... 21 蒸發(fā)冷凝器熱量衡算 ................................................................................................. 21 熱量衡算 ..................................................................................................................... 22 第四章 提純塔的設計計算 ....................................................