RU2124392C1 - Method of automatically controlling process of mixing boiler fuels with ship mazuts in mixing module - Google Patents

Abstract

FIELD: petroleum products processing. SUBSTANCE: invention relates to production of commercial petroleum products in petroleum processing and petrochemical industry and can be used at commodity-feedstock production enterprises, at oil-storage depots, and at mixer-tankers for mixing commercial mazuts (boiler and process fuels, ship mazuts) on stationary installations and mobile mixing modules. Method consists in preparing basic mazut from mixture of light components and heavy component, mixing it with additive, and controlling their intakes. A part of commercial mazut is recycled in the course of its preparation with deviation to heavy component by means of (i) regulating intake of light components' mixture using pressure drop on the first thermostat and taking into account linear velocity of recycled part of mazut passing through the second thermostat and correcting heavy component intake; (ii) regulating intake of heavy component in dependence on linear velocity (flowability) in the second thermostat taking into account intake of depressor additive and pressure drop on the first thermostat; and (iii) regulating intake of depressor additive in dependence on temperature of mazut in the second thermostat taking into account linear velocity of commercial mazut in the second thermostat and intake of light components. EFFECT: facilitated process control. 1 dwg

Description

 The invention relates to the production of marketable petroleum products in the oil refining and petrochemical industries and can be used in commodity production, in oil depots and tanker-mixers for mixing commercial fuel oil (boiler and process fuels, marine fuel oil) in stationary installations and mobile mixing modules.

 A known method of continuous automatic preparation of diesel fuels in a stream by cascading mixing from pre-formed individual components, controlling their costs (see Aut. Certificate. USSR N 1674059, class G 05 B 11/58, C 10 L 1/04, G 05 D 27/00, 1991).

 The closest in technical essence to the claimed solution is a method for the automatic preparation of mixed fuel oils by mixing the individual components and controlling their costs, including the preparation of base fuel oil from a mixture of light components and a heavy component, mixing it with an additive (see RF patent N 2011211, class G 05 B 11/08, C 10 L 1/04, G 05 D 27/00, 1994).

 This decision is taken as a prototype.

 However, the lack of reliable and accurate domestic quality analyzers does not allow, in the known method, to control such wet quality indicators as pour point and viscosity in the process of preparing a marketable product, in addition, the known method limits the range of components to be mixed, which reduces the production of commercial fuel oils.

 The objective of the proposed method is the possibility of using the method for mixing commercial fuel oil of various assortments on stationary and mobile mixing modules with the indirect use of determining quality indicators (pour point and viscosity), which can significantly reduce unproductive reserves in quality, and, as a result, increase the production of commercial fuel oil due to the optimal involvement of the heavy component in the mixture.

 The problem is achieved in that in a method for automatically controlling the process of mixing boiler fuels and marine fuel oil in a mixing module by mixing the individual components and controlling their costs, including the preparation of base fuel oil from a mixture of light components and a heavy component, mixing it with an additive according to the invention in the process mixing recycle part of the commercial fuel oil, while the mixture of light components is fed into the mixing tee depending on the pressure drop part of commercial fuel oil on the first capillary thermostat at a constant flow rate and constant temperature in it, taking into account the linear velocity (fluidity) of the recirculated part of commercial fuel oil through the second capillary thermostat at a different constant temperature and a correction for the consumption of the heavy component for mixing, the heavy component is mixed depending on the linear speed (fluidity) of the recirculated part of the fuel oil through the second capillary thermostat at a constant temperature taking into account the differential and the pressure at the first capillary thermostat and the flow rate of the depressant additive, and the depressant additive for mixing is carried out depending on the temperature at the second capillary thermostat taking into account the linear velocity of the fuel oil through it and the flow rate of the mixture of light components.

 The drawing shows a diagram of a device that implements the proposed method.

 The device comprises a mixer 1, a flow meter 2, an actuator 3 located on the pipeline for supplying a mixture of light components to the mixing tee 4, a flow meter 5, an actuator 6 on the line for supplying a heavy component to the mixing tee 4, a flow meter 7, an actuator 8 located on the line filing a depressant additive in the mixing tee 4, circulation line 9, the first capillary thermostat 10 with a differential pressure sensor 11, connected by the first output to the first input of the adder 12, the second input of which is connected to the first the linear speed sensor 13, and the output with the regulator 14, the second input of which is connected to the flow sensor of the heavy component 5, and the output to the actuator 3. The inputs of the first thermostat 10 and the second thermostat 15 are connected to the mixing tee 4. Thermostat 10 output through the sensor the flow rate of the recirculated part of the fuel oil 16 and the actuator 17, and the first output of the thermostat 15 through the second output of the linear speed sensor 13 are connected to the line of the heavy component. The second output of the thermostat 15 through the temperature sensor 18 is connected to the first input of the controller 19, the second input of which is connected to the output of the adder 20, one input of which is connected to the flowmeter 2, and the second to the third output of the linear speed sensor 13, the fourth output of which is connected to the first input the controller 21. The second input of the controller 21 is connected to the output of the adder 22, and the output to the actuator 6. The first input of the adder 22 is connected to the flowmeter 7, and the second input to the second output of the differential pressure sensor 11.

 The method of automatically controlling the process of mixing commercial fuel oil in the mixing module is as follows.

 In the mixer 1, a homogeneous mixture is prepared from a set of light components, which is then fed into the mixing tee 4. The flow rate of the mixture of light components is regulated depending on the pressure drop across the capillary thermostat 10 at a constant temperature at its outlet and a constant flow rate. Since viscosity is a function of the differential pressure, the flow rate of the mixture of light components is regulated depending on the viscosity of the fuel oil, taking into account the linear speed at the second capillary thermostat 15 at a constant temperature at the outlet, i.e. the pour point. Since the pour point is a function of the linear velocity (fluidity) of commercial fuel oil, taking into account the consumption of the heavy component for mixing, the regulator 14 works out the regulating effect to the actuator 3 depending on the summed variables of viscosity and pour point in the adder 12 with correction for the flow rate of the liquid component for mixing .

 The supply of the heavy component to the mixing is regulated depending on the linear speed, that is, the flow of commercial fuel oil through the second capillary thermostat 15 at a constant temperature equal to the pour point of commercial fuel oil. The variable from the output of the linear speed sensor 13 is fed to the first input of the controller 21, to the second input of which the signal from the differential pressure sensor 11 on the first thermostat 10, that is, the viscosity and the variable from the sensor 7 of the depressant additive flow rate to the base fuel oil, is supplied to the regulator 21 fulfills the regulatory action of the actuator 6.

 The consumption of the depressant additive in the base fuel oil is regulated depending on the temperature at the outlet of the commercial fuel oil from the capillary thermostat 15, the signal from the temperature sensor 18 is fed to the first input of the controller 19, the second input of which is the linear speed signal summed in the adder 20 from the sensor 13 and variable with sensor 2 flow of a mixture of light components for mixing. The regulator 19 fulfills the regulatory action of the actuator 8.

 Part of the commercial fuel oil after circulation line 9, having passed through the capillary thermostats 10 and 15, is discharged into the heavy component line along the recirculation line after the actuator 6, improving the viscosity-temperature properties of the heavy component and, as a result, the base fuel oil.

 The proposed solution allows the preparation of commercial fuel oil with a minimum margin in quality, since the supply of commercial fuel oil to recycling is determined only by the hydrodynamic mixing system.

Claims (1)

 A method for automatically controlling the mixing of boiler fuels and marine fuel oil in a mixing module by mixing the individual components and controlling their costs, including preparing a base fuel oil from a mixture of light components and a heavy component, mixing it with an additive, characterized in that part of the commercial fuel oil is recycled in the mixing process , while the mixture of light components in the mixing tee is carried out depending on the pressure drop of the recycled part of the commercial fuel oil on the first capil at a constant flow rate and a constant temperature in it, taking into account the linear velocity (fluidity) of the recirculated part of commercial fuel oil through a second capillary thermostat at a different constant temperature and a correction for the consumption of the heavy component for mixing, the supply of the heavy component for mixing is carried out depending on the linear speed ( yield) of the recirculated part of the commercial fuel oil through the second capillary thermostat at a constant temperature taking into account the differential pressure on the first capillary thermostat and the consumption of depressant additives, and the depressant additive for mixing is carried out depending on the temperature on the second capillary thermostat taking into account the linear velocity of the fuel oil through it and the flow rate of the mixture of light components.