Acknowledgement! Background materials and related technical support are provided for the creation of this article.
Zhongke Huizhi (Beijing) Technology Co., Ltd.: Mr. Cao Jianxi, Mr. Liu Xiaofei, Ms. Chen Jinxia.
China Steel Group: Mr. Liu Xikun.
Beijing Shida Shengming Technology Co., Ltd.: Mr. Chen Liming.
1. Overview
In recent years, there have been a number of sets of 260,000 tons / year ammonia oxidation method to produce acrylonitrile devices in operation. In the process, it is basically configured according to the mode of 2 reaction systems + 2 sets of quenching system + 1 set of absorption system + 1 set of product refining system.
The quenching system consists of removing the unreacted ammonia component.
In this paper, a 260,000 tons/year acrylonitrile device is taken as an example to discuss the process calculation problem of 1 set of quenching system of acrylonitrile device.
2. Feed composition of quenching system
The feed of the quenching system includes four streams of materials such as reactants, quenched cold water, sulfuric acid and gas from the quenching tower kettle liquid stripper, and the feed composition of a 260,000 tons /year acrylonitrile device is as follows. Among them, the material from the quenching tower kettle is a circulating logistics, and the composition, flow rate and other process parameters of the logistics are automatically calculated during the calculation process.
3. Introduction to the process flow
Reactants (102) and sulfuric acid (101) from the reactor enter the quenching tower (C-1201) from the bottom; quenched water (114) enters the quenching tower (C-1201) from the top; gas from the quenching tower (113) enters the quenching tower (C-1201) from the top; circulating material (108A) from the bottom of the quenching tower (C-1201) enters the quenching tower (C-1201) from the bottom. The top of the quenching tower (C-1201) is the reactor of quenching and removing ammonia (109); the bottom material of the tower containing ammonium sulfate (104), the bottom material of the tower (104) is divided into two channels after being pressurized by the pump (P-101), one (106) from the returning quenching tower (C-1201) as a circulating logistics, and the other (108) to the quenching tower kettle liquid stripping tower (C-1218).
The quenching tower kettle liquid (108) from the bottom pump of the quenching tower enters the quenching tower liquid stripping tower (C-1218) from the top; the stripping steam (110) enters the quenching tower kettle liquid stripper (C-1218) from the bottom of the tower. The quenching tower kettle liquid stripping tower (C-1218) and the gas phase (113) at the top of the tower are returned to the quenching tower (C-1201) from the bottom of the tower; the ammonium sulfate solution (111) is extracted from the bottom of the tower and sent for further concentration.
4. PRO/II calculation keyword file (file name 200522Y)
5. Product quality distribution process calculation results
5.1. Calculation result of product quality flow distribution process
The logistics number is shown in section 3.
5.2. Calculation result of product quality fraction distribution process
6. Epilogue
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