PPR for installation of visbreaking production automation system

Control of an object is the process of influencing it in order to ensure the desired course of the process in the object or the desired change in its state. Automation of production leads to an improvement in the main indicators of efficiency:  an increase in the number of products;  improving the quality and reducing the price of products;  increasing labor productivity. The introduction of automatic devices ensures the reduction of defects and waste, the reduction of raw materials and energy costs, and the reduction of the number of main workers. The purpose of controlling the absorption process is to maintain the constancy of the specified concentration of the extracted component in the depleted gas, as well as to maintain the material and thermal balances of the absorption plant.  The ACP level ensures compliance with the material balance of the absorber.    

1 Initial data for design  

1.1 Brief description of the technological process and equipment  

Figure 1 – Absorption Process Diagram Figure 1 shows a diagram of the absorption process. Saturated gas enters the absorber 1. In the absorber, an absorbent is sprayed at a temperature of 60 ° C, the gas, passing through the absorbent, is purified and becomes depleted, goes through the pipe to the environment, in this pipe the concentration of the initial component is checked should be 1.5 percent. The sprayed absorbent is collected at the bottom of the absorber and becomes a saturated absorbent. To prevent the gas mixture from slipping from the absorber into the saturated absorbent line, the saturated absorbent accumulates at the bottom of the absorber to a certain level from 300 to 380 mm and works as a hydraulic valve. To accelerate the absorption process in the absorber, it is necessary to maintain a pressure in the range from 0.388 to 0.412 MPa. Next, the saturated absorbent enters the heat exchanger 3 and there is cooled to 15 ° C. After he gets into  

adsorber 5, where, passing through the adsorbent, it is purified and becomes purified with an absorbent concentration of 35 percent. In the adsorber, it is also necessary to maintain the level, as well as the absorber. Part of the absorbent goes to further purification into the dephlegmator, the other part goes to the absorbent capacity 4. Since in the adsorber there is not a complete purification of the absorbent, the components of the original mixture remain in it, we need to introduce part of the pure absorbent into the system. In the capacity of the absorbent, the absorbent is settled and enters the refrigerator. In the pipe between the container and the refrigerator, the concentration of the absorbent should be checked to be 40 percent. Also, when the level of 1700 mm in the tank is reached, part of the absorbent is removed from the system. In the refrigerator, the absorbent is cooled to 60 ° C and served in an absorber. The process is repeated.    

1.2 List of technological parameters of control and regulation  

level control in the absorber from 300 to 380 mm;  pressure regulation in the absorber from 0.388 to 0.412 MPa;  control of the concentration of the substance in the depleted gas up to 1.5 per cent;  temperature control in the absorber from 35 to 40 ° C;  temperature control in the heat exchanger 15°C;  level control in the adsorber from 300 to 380 mm;  control of the concentration of the substance in the purified absorbent of 35 percent;  adjustment of the level in the absorbent container 1700 mm;  control of the absorbent concentration after the absorption capacity of 40 per cent;  temperature control in the refrigerator 60°C.    

1.3 Selection and justification of automation  tools

Temperature sensors OVEN DTS045M-50M measuring temperature range from minus 50 to plus 180 ° C;  Pressure sensors ARIES PD100-DI0,6-111-1,0 upper measuring limit 0,6 MPa;  Remote control level sensors-1.2.400. .100 with a lower limit of 100 mm and an upper limit of 400 mm;  Remote control level sensors-2.1.1700 with a limit of 1700 mm;  Concentration sensor for liquids and gases AnaCONT LCK2314;  Control valve SUMSON type 3251 actuator type SAM-30.