RU85457U1 - AUTOMATED DEVICE FOR DRAINING HIGH VISCOUS PRODUCTS FROM THE TANK - Google Patents

Abstract

An automated device for draining highly viscous products from a tank, containing a device operation control system, a product heating circuit, including a bottom drain device connected in series to the bottom of the tank, an ejector, a drain pipe, a pump, a heat exchanger, a pressure pipe, the outlet of which is equipped with nozzles, is placed in the bottom of the tank and is equipped with a controllable control valve and a recirculation circuit isolated from the heating circuit using an additional pipeline, As a result, the input of the additional pipeline is connected to the pressure pipe behind the heat exchanger, and the output to the ejector and is equipped with a controllable control valve, in addition, the device is equipped with a pressure sensor installed at the pump outlet, connected to a speed controller, temperature and pressure sensors at the pump inlet, connected with a control system and a temperature sensor connected to the control system, and on the supply pipe of the coolant - a control valve, characterized in that in the drain pipe oprovode installed upstream of the pump strainer, and before the ejector - the temperature sensor with a low inertia, whose output is connected to the control system.

Description

The utility model relates to devices for draining highly viscous products from containers, for example, railway tanks, using circulation heating systems and can be used at transshipment terminals and tank farms.

A device for heating and draining fuel oil from railway tanks (RF patent No. 2103212, IPC B65D 88/74, publ. 01/27/98), containing a suction pipe, a transfer pump and a pressure pipe with a heat exchanger forming a recirculation line inlet the heat exchanger is connected to the suction pipe bypass pipe with a valve, a vacuum pump is connected to the suction pipe through the valve.

The device does not have nozzles that create the destruction of a cold product, due to low thermal conductivity, heating is delayed and the use of an additional circuit becomes unjustified. The product is drained to bypass the heat exchanger, which requires additional heating of the product in the park and increases the cost of pumping.

A known method of controlling the process of draining high-viscosity oil products from railway tanks (RF patent No. 2257327, IPC B65D 88/74, G05D 27/02, publ. 07/27/05, BI No. 21), a device for implementing the method includes a data collection and processing unit , ambient temperature sensor, wind speed sensor, temperature sensor of the outer wall of the tank. On the lower drain device, a lower drain device is installed, containing a telescopic hydraulic monitor with a nozzle head. The circulation circuit includes: a drain pipe, a circulation pump, a valve to control the flow of product into the heat exchanger, a pressure pipe.

The disadvantage of this device is its low efficiency. The cold product is heated in the tank by a jet of hot product from a hydraulic monitor. This causes the destruction of the cold product and its partial melting. Fragments of the non-molten product can lead to clogging of the pipes and the termination of the discharge of the product from the tank, which is observed in practice. The high viscosity of the product does not allow to increase the rate of destruction and extraction from the tank, without increasing the risk of clogging of the drain pipe.

A well-known automated device for draining highly viscous products from a container (RF patent No.RU 60 499 U1, IPC B65D 88/74, G05D 27/02, published July 24, 2006), comprising a device operation control system, a drain pipe with a controlled shut-off valve and a product heating circuit connected to it, including a suction pipe connected in series to the bottom of the tank, a pump, a heat exchanger, a pressure pipe, the outlet of which is equipped with nozzles, is located in the bottom of the tank and is equipped with a controlled control valve Moreover, in addition, the heating circuit is equipped with a pressure sensor at the pump inlet connected to the operation control system and a temperature sensor at the heat exchanger outlet, a recirculation circuit is highlighted in the heating circuit using an additional pipe, the input of the additional pipe being connected to the pressure pipe behind the heat exchanger, and output - introduced into the suction pipe, in addition, a pressure sensor is installed at the pump output, the output of which is connected to the pump speed controller, and at the pump inlet - a temperature sensor whose output is connected to the control system.

The disadvantage of this device is the lack of information about the current state of the drain pipe, necessary to predict the possible clogging and emergency stop of the drain system.

The utility model solves the problem of increasing the efficiency and reliability of the process by saving energy and preventing an emergency stop of the process of draining viscous products.

To solve the problem in a known device for draining highly viscous products from a tank containing a device operation control system, a product heating circuit, including a bottom drain device connected in series, connected to the bottom of the tank, an ejector, a drain pipe, a pump, a heat exchanger, a pressure pipe, the outlet of which equipped with nozzles, located in the bottom of the tank and equipped with a controllable control valve and a recirculation loop isolated from the heating circuit using an additional a pipeline, the input of the additional pipe connected to the pressure pipe behind the heat exchanger, and the output to the ejector and equipped with a controllable control valve, in addition, the device is equipped with a pressure sensor installed at the pump outlet, connected to a speed controller, temperature and pressure sensors at the inlet a pump connected to the control system and a temperature sensor connected to the control system, and on the supply pipe of the coolant - a control valve, is offered in install a coarse filter in front of the drain pipe, and a low-inertia temperature sensor in front of the ejector, the output of which is connected to the control system.

At start-up, the system is filled with hot fuel oil from the tank farm. The cold product is heated in the tank by a jet of hot product from a hydraulic monitor. This causes the destruction of the cold product and its partial melting. Since the product has low thermal conductivity, this reduces the heating time.

The coarse filter prevents non-molten fragments from entering the pump, this increases the stability of the system and allows you to increase the rate of erosion of the frozen product.

The pressure in the pressure pipe is maintained by changing the speed of rotation of the pump, which is carried out by a regulator operating on the pressure sensor installed at the pump outlet.

Draining of the product from the tank begins until the tank is completely heated, this allows to reduce the downtime of the tank and reduce the energy required to heat the entire tank.

The drawing shows a block diagram of a device for draining highly viscous products from a container.

The device contains: a control valve on the coolant - 1; product temperature sensor after heat exchanger - 2; pressure regulator at the pump outlet - 3; pressure regulator sensor at the pump outlet - 4; control unit - 5; temperature sensor after the bottom drain device - 6; temperature sensor at the pump inlet - 7; pressure sensor at the pump inlet - 8; heat exchanger - 9; control valve in the heating circuit - 10; control valve in the recirculation circuit - 11; lower drain device - 12; capacity - 13; bottom drain device - 14; telescopic hydraulic monitor - 15; pressure collector - 16; drain pipe - 17; circulation pump - 18; valve supply to the tank farm - 19; ejector - 20, coarse filter - 21.

The heating circuit includes: a tank 13, a bottom drain device 14 containing a telescopic hydraulic monitor with a nozzle head 15, an ejector 20, a drain pipe 17, a coarse filter 21, a circulation pump 18, a heat exchanger 9, a pressure manifold 16, a product flow control valve 10 in the circuit.

The recirculation loop includes: an ejector 20, a drain pipe 17, a coarse filter 21, a circulation pump 18, a heat exchanger 9, a pressure header 16, a product flow control valve 11 in the circuit.

To control the flow of the heated product into the tank farm, valve 19 is used.

The operation of the device is as follows.

Before starting work, the recirculation loop is filled from the tank farm. The nozzle of the lower drain 14 is connected to the tank 13. With the valves 10 and 19 closed, valve 11 opens, pump 18 is turned on, and circulation begins. The speed of rotation of the pump 18 is controlled by a regulator 3 supporting the outlet pressure (1.0 MPa), measured by a pressure sensor 4. The valve 1 opens and the flow of heat medium to the heat exchanger 9 begins, the heat exchanger is controlled by the readings of temperature sensor 2.

The product is pumped to the heat exchanger 9 by a pump 18 and then, with the valve 11 open and the valves 10 and 19 closed, the hot product from the heat exchanger 9 is fed to the pump inlet through the ejector 20. After reaching the temperature at the outlet of the heat exchanger 9 of the set value (90 ° C), the valve 10 is opened at a predetermined angle (10%) and the valve 11 is simultaneously closed at the same angle. The hot product from the heat exchanger 9 is fed through the pressure pipe 16 through the hydraulic monitor 15 to the tank 13, where it is mixed with the cold product.

A mixture of cold product taken from the tank 13 and hot, supplied through the valve 11, enters the ejector 20, and then through the filter 21 to the inlet of the pump 18. When the temperature at the inlet of the pump exceeds a predetermined value (40 ° C), the opening of the valve 10 increases .

Fragments of the unmelted product are retained by the coarse filter 21. The concentration of the unmelted fragments in the two-phase mixture of the product is proportional to the decrease in the temperature of the mixture, measured by the sensor 6, from the value of the set temperature at which the stable operation of the installation is ensured. With an increase in the integral of the temperature difference over time, the opening angle of the valve 11 is increased. If the pressure at the pump inlet falls below a predetermined value, the integration constant is adjusted and the controller settings are optimized. With the continued pressure drop below the critical value, the heating circuit is completely turned off by valve 10 and the mode is repeated.

When the temperature of the drained product falls below a predetermined value (35 ° C), the opening angle of valve 10 decreases.

If the temperature and pressure at the pump inlet are higher than the set values (35 ° C, - 0.05 MPa) increase the amount of product discharged into the park, opening valve 19.

Claims (1)

An automated device for draining highly viscous products from a tank, containing a device operation control system, a product heating circuit, including a bottom drain device connected in series to the bottom of the tank, an ejector, a drain pipe, a pump, a heat exchanger, a pressure pipe, the outlet of which is equipped with nozzles, is placed in the bottom of the tank and is equipped with a controllable control valve and a recirculation circuit isolated from the heating circuit using an additional pipeline, As a result, the input of the additional pipeline is connected to the pressure pipe behind the heat exchanger, and the output to the ejector and is equipped with a controllable control valve, in addition, the device is equipped with a pressure sensor installed at the pump outlet, connected to a speed controller, temperature and pressure sensors at the pump inlet, connected with a control system and a temperature sensor connected to the control system, and on the supply pipe of the coolant - a control valve, characterized in that in the drain pipe oprovode installed upstream of the pump strainer, and before the ejector - the temperature sensor with a low inertia, whose output is connected to the control system.