SU1386639A1 - Device for automatic control of heating of crude oil for the process of its demineralization and dewatering - Google Patents

Abstract

The invention relates to automatic control devices for the preparation of oil for desalting and dewatering in oil fields. The aim of the invention is to stabilize the temperature of the crude oil at the preheater outlet. The device contains a flow rate control loop containing temperature sensors of heat carrier 12, 13 at the inlet and outlet of the preheater 2, a moisture meter 11, a raw material temperature sensor 10 connected to a computing unit 8 connected through a stabilizing flow regulator 7 with an 1M mechanism 4 heat carrier lines, 2 Il. to cl

Description

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The invention relates to the automatic control of the preparation process: the refining of oil for its desalting and

 Dehydration in oil fields.

The aim of the invention is to stabilize the temperature of the crude oil at the outlet of the preheater.

Fig. 1 shows a primer), a spalled block diagram of a device for automatically controlling the heating of oil;

2, a computational diagram

block.

The device consists of a pipeline 1 for supplying oil, preheater 2,

an apparatus 3 for desalting oil dehydration, an iTele mechanism 4, a differential pressure sensor 5, a pressure regulator 6, a heat carrier, a stabilizing regulator 7, a computing unit 8, a raw material consumption sensor 9, a crude oil temperature sensor 0, a moisture meter 11, sensors 12 and 13 of the temperature of the coolant installed at the inlet and outlet of the heater.

The computing unit 8. consists of a temperature setting device 14, a first and second 16 subtraction units, a first 17 and a second 18 multiplication units, a multiplication unit 19 by a constant coefficient, a summation unit 20, a division unit 21.

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A digital-to-analog converter 22 is connected to computing unit 8.

The device works as follows.

Crude oil through pipeline 1 through the heater 2 enters the apparatus 3 for its desalting and dehydration. The flow of the coolant in the heater 2 regulate the actuator 4, installed at the entrance to the heater 2 on the line coolant. The signal from the differential pressure sensor 5 (differential meter) is fed to the input of the controller 6, which has a corrective effect on the actuator 4 through the stabilizing regulator 7. The inputs of the computing unit 8 receive coded signals from the sensor 9 of the raw material consumption, sensor 10 temperature of crude oil and moisture meter 11, which are installed on the line of crude oil, from sensors 12 and 13 of the temperature of the coolant, ustre386639

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five

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Dtatz,

K ,, K, K.

installed on the inlet and outlet of the heater 2.

The powering unit performs the calculation to determine the value of the flow of the coolant according to the formula

O 5, .Qc (T, afi,) lKi + K, $: i.

t, w out

 t

where QC is the consumption of crude oil;

TC - crude oil inlet temperature of the preheater; the temperature of the coolant at the inlet and outlet of the heater;

- set point of oil temperature at the preheater outlet;

.J are the coefficients associated with the specific heat capacity of the coolant, oil and water;

The operation of the computing unit 8 is carried out as follows.

Cheats {T. J and go to the first and second inputs of the first subtraction unit 15, respectively, which forms the code - T.}, arriving at the second input of the first multiplication unit 17, the first input of which receives the code. The first multiplication unit 17 forms the code (Tcc, dU - GTL) fQcl.

The code UT pos falls on the block 19 multiplied by a constant coefficient, the code K5 on the input of the block 20 summation, where the code XV CL is formed.

40 Codes ({T, ", - - Tj) - Qcl 1R | + fKjl from the outputs of the second multiplication unit 18 and the summation unit 20, respectively, are fed to the first and second inputs of the second intelligent unit 18

. where the code (-Sh) CQc l-ccy -rK, + fK) K, l is generated.

Codes T and go to the first and second inputs of the second block

ep subtraction, respectively, where the formation of iGgrv Ggg,

Route code {TT - T 5.

codes (TL) -

(UK). I and GTP T With the outputs of the second multiplication unit 18 and the second subtraction unit 16, respectively, are posted to the first and second inputs of the division unit 21, which forms the code

slitTio. 1-YL1- (CiVlKj ig I-kL xV

The output signal, proportional to the value of the flow rate of the coolant, comes from the computing unit 8 as a task to the stabilizing regulator 7 acting on the actuator 4.

Claims (1)

Invention Formula An automatic control unit for heating the crude oil for the process of desalting and dehydrating, containing a raw material consumption sensor connected to the first input of the first multiplication unit, a raw material pressure differential sensor connected to the coolant flow regulator and connected via a stabilizing regulator to the actuator on the coolant inlet line , distinguished by the fact that, in order to stabilize the temperature of the oil at the outlet, the heater, it additionally contains a temperature sensor and a moisture meter on the inlet ode preheater, temperature sensors coolant on the input and output of the preheater, the temperature setter of the prepared raw material units of subtraction, summation, the second multiplication unit, the dividing unit, while the temperature sensor of the raw material is connected to the first input of the first subtraction unit, the second input of which is connected to the setpoint temperature of the prepared raw material, and the output the second input of the first block at the skin, the moisture meter through the constant multiplication unit is connected to the summation unit, the output of which is connected to the second input of the second multiplication unit, the first input of which is connected to Exit first multiplying unit, and a heat medium temperature sensors are connected to a second subtracting unit, whose output is connected to the second input of the dividing block, the first input of which is coupled to the output of the second multiplying unit, and an output - through a digital to analog converter to a second input of the stabilizing regulator.