Before reading this article, please click on the blue font " China Chemical Safety Association " under the heading of this article and click " Follow ", so you can receive the article for free. Share every day, completely free subscription, please rest assured! Heat exchangers are widely used in chemical, petroleum, power, atomic energy and other industrial sectors. Its main function is to ensure the specific temperature required by the process for the medium, and it is also one of the main equipments to improve energy efficiency. The heat exchanger is heated. The effective control of the material outlet temperature is an important condition for ensuring quality, energy saving and safe production. How to ensure the temperature of the heated material outlet requires an effective and reliable temperature instrument automatic control system, then the heat exchanger temperature control scheme has What? 1. The temperature of the heated material outlet control the flow rate of the heated material or medium 2. The temperature of the heated material outlet controls the bypass flow of the heated material or medium; 3. The temperature of the heated material outlet is controlled to heat the material or medium into the heat exchanger and to bypass the flow There are two types of this control scheme: ( 1 ) A regulating valve is arranged on the bypass line of the heating material or the medium into the heat exchanger, and the two regulating valves are separately controlled by the temperature of the heated material outlet. ( 2 ) A three-way regulating valve is arranged on the bypass line of the heating material or medium into the heat exchanger, and the three-way valve is controlled by the temperature of the heated material outlet. Hazard and Operability Analysis ( HAZOP ) requires consideration of both operability and safety issues. The requirements for heat exchanger temperature control schemes from the standpoint of operability are: (1) The flow rate of the heated material or medium during the temperature adjustment process does not affect the upstream of the heated material or medium, such as the pressure rise, the material does not go anywhere; (2) The failure mode ( FC , FO ) of the regulating valve and the three-way regulating valve should also consider the safety problem when the process requirements are met; (3) Because the bypass adjustment cannot guarantee that 100% of the heated material or medium is cooled to the specified temperature, bypass adjustment cannot be adopted if the temperature of the heated material or medium after heat exchange is required; (4) Whether the control scheme is easy to achieve automatic control and stable in the production process; The above is the current use of more than a few temperature control programs in the production process and HAZOP analysis of the temperature control program, but the use of that program requires a combination of production processes, process parameters control conditions requirements, economic considerations. (Source: Process Safety Management) [Editor: Chen Guofang] Good things not only need to be collected, but also don't forget to share friends! Aluminum Sheet,Solid Aluminum Sheet,Aluminium Roofing Sheet,Aluminium Corrugated Sheet SHAOXING YOTO IMPORT&EXPORT CO., LTD , https://www.sxytmaterial.com
Requirements for heat exchanger temperature control scheme during HAZOP development