CN102375411A - Online oil product blending method and device - Google Patents

Abstract

The invention discloses an online oil product blending method and device. Component oil from a production device is subjected to quality analysis through an online analyzer; quality analysis results of the component oil are input in a blending computer; according to quality requirements of refined oil products and the quality analysis results of various component oil, the blending computer adjusts the opening degree of a component oil adjustable valve; and the adjustable valve controls one part of component oil flow to enter a mixer to be mixed and then enter a refined oil product storage tank and controls the other part of component oil to enter respective component oil storage tanks.

Description

A method and device for online blending of oil products

technology field.

The invention relates to a method for blending oil products, in particular to an online blending method and device for oil products.

Background technique

Petroleum refining is an important production area of the petrochemical industry. Crude oil is refined into component oils of different distillation ranges through the refining of petroleum refining production units in the refinery. Most of the component oils extracted by the production equipment cannot be directly sold as refined oil products, because various grades of refined oil have very clear quality index requirements, but the component oils produced from the production equipment are often not It does not fully meet the quality index requirements of a certain refined oil brand. In most cases, some quality indicators do not meet the requirements, while other quality indicators may be a lot richer. In order to fully meet the quality index requirements of refined oil, the general practice is to select suitable component oils extracted from different production devices according to the quality index requirements of refined oil, and blend them in a certain proportion to make the blended refined oil It meets the quality index requirements of a certain refined oil brand. The above working process is called "oil blending". Since an oil refinery often has multiple sets of production equipment, and each set of equipment produces many kinds of component oils, and the quality indicators of different component oils are different, the component oils produced from different production equipment It is a very difficult job to choose which component oils and mix them in what proportion, and this is also the main problem to be solved in the oil blending work. Oil blending problem is a typical optimization problem. The goal of optimization is to meet high production profit. Constraint conditions include material balance, resource conditions, product quality constraints, product demand, product tank capacity, blending ratio constraints, etc. Among them, the main quality indicators of gasoline include octane number, anti-violence index and sulfur content, etc.; the main indicators of diesel oil include condensation point, flash point, density, chroma, etc.

In order to minimize the cost of oil blending and maximize the output value, Li Yan proposed a multi-objective evolutionary algorithm in the 12th issue of "Science and Technology Vision" in 2008, and applied it to oil blending, using NSGA2 to solve multi-objective problems. Shao Yu wrote an article in the first issue of "Petrochemical Automation" in 2004, introducing various factors and management measures of intelligent oil blending.

In general, on the premise that the quality standard of the required refined oil is known, the cost should be minimized and the output value maximized. Therefore, there are currently two main methods of blending gasoline and diesel: 1) Circulating blending in the tank, that is, putting the component oil into the oil storage tank, manually calculating the blending ratio, and then pressurizing the pump and blending in the tank The nozzle completes the blending. This method requires a lot of manual calculations, low accuracy, low blending efficiency, low blending accuracy, and serious waste. This blending method is gradually eliminated; 2) Online automatic pipeline blending. Online pipeline blending is the current blending development trend. Most petrochemical companies adopt this method, but most of them use static blending, that is, the component oil is first stored in the oil storage tank, and then the quality requirements of the finished oil are blended according to the needs. The computer determines the required amount of each component oil, and blends to obtain a qualified product oil. This blending method is static blending. The characteristic is that the quality of each component oil is relatively stable. The disadvantage is that the component oil must be transported to the oil storage tank. , and then transported to the blending equipment, the component oil needs to be transported twice.

In order to achieve online blending of oil products, Chinese patent CN200410009191.4 discloses an online optimization blending system for oil products, which provides a sampling pump that does not need to be used on the fast circuit, thereby reducing the failure rate of the system, reducing downtime and maintenance It is an online optimization blending system for oil products that can save energy and protect the environment. The fast circuit in the oil online optimization blending system can also realize the synchronization of the oil flow in the fast circuit and the corresponding pipeline without using a sampling pump or other energy-consuming equipment, that is, the branch flow and the main flow Synchronize. The oil product online optimization blending system includes a fast loop for sampling connected in parallel to the blended oil component pipeline or product oil pipeline. The pipeline is connected in series with a Venturi tube, and the sample return port of the fast loop is set at the Inside the Venturi tube. The patent is static blending. The components are pumped out from the component tank by the blending pump and then sent to the blending head after being pressurized. The flow control is set in the pipeline before the components enter the blending head. The flow adjustment range is small and the pressure is not balanced.

Chinese patent application 200910197475.3 discloses an online gasoline blending method, which includes: linear and nonlinear mathematical models based on the real-time flow of refined oil and each component oil constituting the refined oil and various quality indicators, gasoline blending mathematics The online real-time self-calibration method of the model, and the real-time optimization technology developed based on the mathematical model. The patent is static blending. The components are pumped out from the component tank by the blending pump and then sent to the blending head after being pressurized. The flow control is set in the pipeline before the components enter the blending head. The flow adjustment range is small and the pressure is not balanced. Solving the deficiencies of time-consuming manual blending, low precision, low one-time blending efficiency, serious waste of octane number, etc. during multi-component blending, the pursuit of maximizing benefits is an urgent problem to be solved at present.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art, and propose an online oil blending method and device, which overcomes the disadvantages of static blending in the prior art, and the component oils come directly from the production device.

An online oil blending method of the present invention, the component oils from the production device are subjected to quality analysis by an online analyzer, and the quality analysis results of the component oils are input into a blending computer, and the blending computer is based on the quality requirements of the finished oil and each group According to the analysis results of the oil separation quality, adjust the opening of the component oil regulating valve, and the regulating valve controls the flow of a part of the component oil to enter the mixer to mix into the product oil storage tank, and the other part of the component oil to enter the respective component oil storage tanks.

The online oil blending method described above is characterized in that: the amount of component oil entering the respective component oil storage tanks is controlled by the pressure on the pipeline to control the opening of the regulating valve.

The pressure on the pipeline to control the opening of the regulating valve is to transmit the pressure signal on the pipeline to the blending computer, and the computer gives instructions to control the opening of the regulating valve through calculation.

The analyzer is a conventional product analysis instrument.

Since the pressure of the component oil production unit is generally relatively stable, the pressure change on the pipeline is caused by the flow of the component oil entering the blending head. , the pressure on the pipeline will also be similar to that of the component oil production unit. When the flow rate of the component oil entering the blending head is smaller than the production volume of the component oil production unit, the pressure on the pipeline will increase, and the signal of the increase in the pressure on the pipeline will be transmitted to the blending unit. The computer, the computer gives instructions to control the opening of the regulating valve through calculation, and sends the remaining component oil to the component oil storage tank.

When a certain component oil production unit stops production, the component oil in the component oil storage tank is transported to the blending head for blending.

The online blending method of oil products is characterized in that: there are at least two kinds of component oils.

An online oil blending device, component oil production device, component oil storage tank, on-line analyzer, regulating valve, blending computer, mixer and product oil storage tank, characterized in that: component oil production device The component oil storage tank and the product oil storage tank are connected by pipelines, and the online analyzer and the regulating valve flow are set on the pipeline, and the component oil storage tank is set between the component oil production device and the component oil pump.

The online oil blending device described above is characterized in that a regulating valve is arranged on the pipeline connecting the component oil storage tank.

Compared with the prior art, an oil online blending method and device of the present invention:

1) Dynamic blending and static blending can be carried out. When the component oil production device is in normal production, dynamic blending can be carried out. When a certain component oil production device is not producing normally, a certain component oil can be blended The production unit is separated from the blending unit, and its component oil storage tank is used to continue blending;

2) The online oil blending system runs stably, improves the accuracy of oil delivery volume, and increases the automation level of blending production;

3) The properties of the product are controlled in real time, the deviation between the octane number and the setting is less than 0.3, and the content of olefins and aromatics are both qualified; the first pass rate of blended product quality reaches 91.9%, which is an average increase of 12.7 percentage points compared with that before it is put into use;

4) Shorten the turnover time of oil tanks; significantly reduce the excess octane number of finished gasoline; make full use of high-octane number components, saving MTBE and debenzene gasoline;

5) The economic benefit is remarkable. According to the cost of gasoline components in 2009, taking the following blending device as an example, the present invention can reduce the production cost by up to 15 million yuan, and the economic benefit is remarkable.

Processing capacity of the blending device: 1) National II 93#/National II 97# gasoline blending at the same time, 93# gasoline --- 198m ³ /h, 97# gasoline --- 203m ³ /h, 2) National III 93#/National III 97 #Gasoline blending at the same time, 93# gasoline---246m ³ /h, 97# gasoline---75m ³ /h.

Drawings and Description of Drawings

Fig. 1 is a schematic diagram of the device for online blending of three component oils according to the present invention.

1. First component oil production device, 2. First component oil storage tank, 3. First component oil return regulating valve, 4. First component oil regulating valve, 5. First component oil pump, 6 .First component oil regulating valve, 7. Static mixer, 8. Refined oil tank, 9. Second component oil production device, 10. Second component oil storage tank, 11. Second component oil return flow adjustment Valve, 12. The second component oil regulating valve, 13. The second component oil pump, 14. The second component oil regulating valve, 15. The third component oil production device, 16. The third component oil storage tank, 17. The third component oil return regulating valve, 18. The third component oil regulating valve, 19. The third component oil pump, 20. The third component oil regulating valve.

Detailed ways

As shown in Figure 1, it is a schematic diagram of on-line blending of three component oils from production equipment.

From the three component oils from the first component oil production unit 1, the second component oil production unit 9 and the third component oil production unit 15, after the online analyzer carries out quality analysis, the component oil quality analysis results Input the blending computer, and the blending computer adjusts the first component oil regulating valve 6, the second component oil regulating valve 14 and the third component oil regulating valve 20 according to the product oil quality requirements and the analysis results of each component oil quality The opening degree controls the flow of the first component oil, the second component oil and the third component oil into the mixer respectively, enters the static mixer 7, and enters the finished oil storage tank 8 after being fully mixed, and the remaining components from the production device The oil enters the respective component oil storage tanks, the first component oil storage tank 2, the second component oil storage tank 10 and the third component oil storage tank 16.

The component oils in the first component oil storage tank 2, the second component oil storage tank 10, and the third component oil storage tank 16 utilize the first component oil pump 5 and the second group oil pump 5 respectively when used for static blending. The oil separation pump 13 and the third component oil pump 19 deliver it to the static mixer for mixing and then enter the product oil tank.

As shown in Figure 1, it is an oil product online blending device composed of three component oils, consisting of a first component oil production device 1, a second component oil production device 9 and a third component oil production device 15, the first component oil production device 15, One component oil storage tank 2, the second component oil storage tank 10 and the third component oil storage tank 16, the first component oil regulating valve 6, the second component oil regulating valve 14 and the third component oil regulating valve Valve 20, first component oil pump 5, second component oil pump 13 and third component oil pump 19, static mixer 7 and product oil tank 8, first component oil storage tank 2, second component oil storage tank The tank 10 and the third component oil storage tank 16 are respectively arranged on the first component oil production device 1, the second component oil production device 9 and the third component oil production device 15 and the first component oil pump 5, the second component oil production device Between the two-component oil pump 13 and the third-component oil pump 19, the openings of the first component oil return regulating valve 3, the first component oil return regulating valve 11 and the first component oil return regulating valve 17 are set at The pressure detected by the pressure detector on the pipeline is controlled to control the entry of the first component oil, the second component oil 0 and the third component oil into the first component oil storage tank 2 and the second component oil storage tank respectively. Tank 10 and third component oil storage tank 16 flows.

Claims (9)

1. An oil product online blending method of the present invention, the component oil from the production device is subjected to quality analysis through an online analyzer, and the component oil quality analysis result is input into a blending computer, and the blending computer is based on the product oil quality requirements and According to the quality analysis results of each component oil, adjust the opening degree of the component oil regulating valve, and the regulating valve controls the flow of part of the component oil into the mixer to mix into the product oil storage tank, and the other part of the component oil into the respective component oil storage tank. 2. An online oil blending method according to claim 1, characterized in that: the flow rate of the component oil entering the component oil storage tank is controlled by the opening of the pressure regulating valve on the pipeline. 3. An online oil blending method according to claim 1, characterized in that: the opening degree of the flow regulating valve of the component oil entering the component oil storage tank is calculated by the blending computer according to the pressure signal on the pipeline. Out command control. 4. An online oil blending method according to claim 1, characterized in that: there are at least two component oils. 5. An online oil blending method according to claim 1, characterized in that: the online analyzer transmits the analysis results of product oil quality and component oil quality to the blending computer, and the blending computer is based on the product oil quality requirements Adjust the opening of each component oil regulating valve to control the flow of component oil entering the blending head. 6. An online oil blending method according to claim 1, characterized in that: when a certain component oil production device is shut down, the component oil is transported from the corresponding component oil storage tank to the blending head to reconcile. 7. An online oil blending device, component oil production device, component oil storage tank, on-line analyzer, regulating valve, blending computer, mixer and product oil storage tank, characterized in that: component oil The production device is connected with the component oil storage tank and the product oil storage tank through pipelines, the online analyzer and the regulating valve flow are set on the pipeline, and the component oil storage tank is set between the component oil production device and the component oil pump between. 8. An online oil blending device according to claim 7, characterized in that: a backflow regulating valve and a pressure detector are also provided on the connecting pipeline between the component oil storage tank and the component oil pump. 9. An online blending device for oil products according to claim 7, wherein the opening of the backflow regulating valve is controlled by the pressure detected by the pressure detector.