METHOD FOR HEATING AND DISPENSING ASPHALT IN AN ABOVEGROUND ASPHALT STORAGE FACILITY

Abstract

A method of heating and dispensing bitumen in an above-ground bitumen storage tank and bitumen terminal is that bitumen is heated. Bitumen is heated in the storage tank. Bitumen is heated in a casing installed in the tank with an intake and drainage pipe. Heated to a temperature of in-plant transportation at least 80° C. In the main storage tank volume bitumen is heated and maintained by heaters. This takes place outside the shell with the intake and drain pipe. Heating takes place at a temperature not lower than the flow temperature of 60° C.

Description

The invention relates to the field of road construction. The invention relates to the storage and heating of bitumen. Bitumen is stored in above-ground bitumen storages and then heated to a working condition (operating temperature). Bitumen is stored with subsequent shipment to external transport or to the technological process.

The method of bitumen preparation at the terminals is known (Moving Liquid Around the Terminal [electronic resource]/Asphalt PRO: URL: https://theasphaltpro.com/articles/moving-liquidaround-the-terminal/(date of reference: 15 Apr. 2019)).

This method includes:

• • heating or maintaining bitumen in large volume tanks (up to 10,000 m3). This occurs at in-plant conveying temperatures. Not below the pumping temperature of the bitumen pump (from 80° C.);
  • pumping to intensive heating tanks (day tanks). The volume is equal to the daily loading capacity of the terminal;
  • heating to the required shipment temperature. Working temperature (not less than 140° C.) for no more than a day;
  • shipment to external transport or to the process.

The closest technical solution is an above-ground bitumen storage tank. Inside the asphalt storage is placed a shell with the intake and drain pipe, heaters, temperature level sensors (Patent RU Nº 150050 E 01 C 19/08, Published 27 Jan. 2015 Bulletin Nº 3). Bitumen preparation process is carried out by heating the main stored mass (outside the casing). Heating to a flow temperature of 60-165° C. Heating, followed by bringing to a temperature of 100-105° C. of the local volume under the casing with the intake and drain pipe. Discharge into horizontal or vertical tanks of intensive heating. Here it is heated to a working temperature (not less than 140° C.). It is also discharged to an external transport or technological process.

However, this technical solution of heating and dispensing bitumen has the following disadvantages:

• • heat losses to the environment. Losses from the surface of intensive heating tanks;
  • bitumen aging due to oxidation through the large area of the bitumen mirror in the intensive heating tanks.

The task of the proposed invention is to reduce energy costs while maintaining the quality of bitumen.

The essence of the invention is a method of heating and dispensing bitumen in an above-ground bitumen storage tank and bitumen terminal. The essence of the invention is that bitumen is heated in a storage tank in a casing installed in it with an intake and discharge pipe. Heating to the temperature of in-plant transportation is not lower than 80° C. A in the main storage tank, outside the housing with the intake and drain pipe, bitumen is heated and maintained by heaters. Heating bitumen at a temperature no lower than the flow temperature 60° C. Bitumen supply is carried out as bitumen is dispensed from the working tank. Bitumen supply from the volume under the casing with the intake and drainage pipe of the storage tank in the main volume of the working tank. A heating of bitumen in the working tank is carried out in a casing installed in it with the intake and drain pipe.

Heating bitumen to an operating temperature of at least 140° C. Heating with subsequent release to external transport or in the technological process. A in the main volume of the working tank, outside the shell with the intake and drain pipe, bitumen is heated to the temperature of in-plant transportation of bitumen not lower than 80° C. Heating is maintained by heaters.Or the bitumen in the storage tank is heated and maintained by heaters throughout the storage tank. Heating is maintained at a temperature of in-plant transportation at least 80° C. Bitumen is fed into the main volume of the working tank as bitumen is consumed from the working tank. A heating of bitumen in the working tank is carried out in a casing installed in it with the intake and drain pipe. The bitumen is heated to a working temperature of at least 140° C. Heating is followed by discharging to an external transport or technological process. A in the main volume of the working tank outside the housing with the suction and drainage pipe heating of bitumen is carried out to the temperature of bitumen for in-plant transportation is not below 80° C. Heating is maintained by heaters.

Or the bitumen in the working tank is heated under the casing with the intake and drain pipe. Heating is carried out to a working temperature of not less than 140° C. Heating is carried out with the subsequent release to an external transport or in the technological process. A in the main volume of the working tank, outside the shell with the suction and drainage pipe, the bitumen is heated and maintained by heaters. Heating at the temperature of in-plant transportation of bitumen is not lower than 80° C.

Technical Result

Technical result-reduction of energy costs is achieved by using a shell with an intake and drain pipe in the working tank for intensive heating of bitumen. Heating bitumen to the temperature of shipment to external transport or in the process (operating temperature).

The technical result is also achieved by excluding the intensive heating tanks from the technological process.

The technical result is also achieved by installing the shell with the intake and drain pipe in the storage tank. Installation of the shell to bring bitumen to the temperature of in-plant transportation of bitumen. This provides a reduction in heat loss. Since the heat loss from the surface of the shell is useful. The heat loss is used to reheat the bitumen in the main volume of the storage tank and working tank.

The technical result is also achieved by preserving the quality of bitumen. Preservation of quality by reducing the contact area of bitumen at high temperature with oxygen. Since the cross-sectional area of the intake and drain pipe is tens of times less than the surface area of bitumen in the tank.

The specified task is achieved:

• • Exclusion of intensive heating tanks from the technological process. Exclusion by installing the shell with the intake and drain pipe in the center of the working tank. This is necessary to heat the local volume of bitumen under the shell with the intake and drain pipe. Heating to the temperatures of the shipment to external transport or in the process (not less than 140° C.). The heat loss is useful. The heat loss provides additional heating and maintains the temperature of asphalt in the main volume of the working tank outside the shell. A contact area of bitumen with oxygen in the intake and drainage tube is dozens of times less than the surface area of bitumen in the intensive heating tanks.
  • installation of the shell with the intake and drain pipe in the center of the storage tank. Heating to the temperature of in-plant bitumen transportation (not lower than 80° C.). Heating only the local volume of bitumen under the shell with the intake and drain pipe. The heat loss is useful. The heat loss provides reheating and maintaining the temperature of bitumen in the main volume of the storage tank outside the casing.

The essence of the invention is explained in the drawings:

FIG. 1 shows a flowchart of the method;

FIG. 2 shows a scheme of implementing the method. Schematic without the hood with the intake and drain pipe in the storage tank;

FIG. 3 shows a schematic of the method for a terminal without a storage tank.

Technological equipment for the implementation of the method includes:

• • storage tank 1;
    • working tank 2 with heaters 3 in the main volume of the tank, casing 4 with the intake-drain pipe and heaters 5 under the casing.

The method is carried out as follows.

For a terminal with a storage tank and a working tank, the method is carried out according to the scheme in FIG. 1. The tanks are equipped with casings with intake and drain pipes. Filled with bitumen working tank 2 is a preparatory operation. Operations prior to the release of bitumen to external transport or in the process:

• • bitumen in the main volume of the working tank 2 is heated to the temperature of in-plant transportation. It is heated outside the shell 4 with the intake and drain pipe. Heating by heaters 3 in the main volume of the working tank 2 at least 80° C.
  • bitumen in the local volume is heated in the shell 4 with the intake and drain pipe. Bitumen is heated by heaters 5 under the housing 4 with the intake and drain pipe of the working tank 2. Heated to a shipment temperature of not less than 140° C.

Bitumen is taken by pumps and fed to external transport or to the technological process. As bitumen is taken from under the shell 4 with the intake and drain pipe of the working tank 2, bitumen flows by gravity to its place. Bitumen comes from the main volume outside the casing of the working tank 2. When the level of bitumen in the working tank 2 to the top mark of the housing 4 with the intake and drainage tube, bitumen in the main volume of the working tank 2 is replenished from the local volume of the housing 4 with the intake and drainage tube of the storage tank 1. This is to ensure the equal delivery of bitumen to external transportation or technological process. For this purpose, bitumen is preheated in the storage tank 1. Warmed up by heaters 3 the main volume of the storage tank 1. Bitumen is heated outside the housing 4 with the intake-drainage pipe. It is heated to a flow temperature not lower than 60° C. This ensures that the bitumen flows by gravity under the housing 4 with the intake and drainage pipe of the storage tank 1. Bitumen is also heated to the temperature of in-plant transportation (not lower than 80° C.). Bitumen is heated in the housing 4 with the intake and discharge pipe of the storage tank 1. It is heated by heaters 5 under the housing 4 with the intake-drainage pipe of the storage tank 1.

As bitumen is dispensed into the main volume of the working tank 2, bitumen from the main volume of the storage tank 1 flows by gravity to its place. Bitumen is dispensed from under the casing 4 with the intake and drainage pipe of the storage tank 1. For the particular case of the bitumen terminal, with the storage tank without the casing with the intake and drain pipe, the method is carried out according to the scheme in FIG. 2. And for the working tank, the method is carried out according to the diagram in FIG. 2. The tank is installed in a casing with the intake and drain pipe. Filled with bitumen working tank 2 undergoes preparatory operations. Operations before the release of bitumen to external transport or in the process:

• • bitumen in the main volume of the working tank 2 is heated to the temperature of in-plant transportation. It is heated outside the shell 4 with the intake and drain pipe. Heated at least 80° C. by heaters 3 in the main volume of the working tank 2.
  • bitumen in the local volume is heated in the shell 4 with the intake and drain pipe. Bitumen is heated by heaters 5 under the housing 4 with the intake and drain pipe of the working tank 2. Heated to a shipment temperature of not less than 140° C.

Bitumen is taken by pumps and fed to external transport or to the technological process. As bitumen is taken from under the shell 4 with the intake and drain pipe of the working tank 2, bitumen flows by gravity to its place. Bitumen comes from the main volume outside the casing of the working tank 2. When the level of bitumen in the working tank 2 to the top mark of the housing 4 with the intake and drainage tube, bitumen in the main volume of the working tank 2 is replenished from the local volume of the housing 4 with the intake and drainage tube of the storage tank 1. This is to ensure the equal delivery of bitumen to external transportation or technological process. For this purpose, bitumen is preheated in the storage tank 1. Heated by heaters 3 the main volume of the storage tank 1. It is heated to a flow temperature of not less than 80° C. This temperature provides pumping or gravity feed of bitumen into the main volume of the working tank 2.

For the particular case of bitumen terminal applies the scheme of implementation of the method according to FIG. 3. Terminal with one tank or with the number of tanks corresponding to the number of stored bitumen grades. According to the scheme, each tank of the terminal is a working tank. A casing with an intake and discharge pipe is installed in the tank. Filled with bitumen, the working tank 2 undergoes preparatory operations. Operations before the beginning of the release of bitumen to external transport or in the process:

• • bitumen in the main volume of the working tank 2 is heated to the temperature of in-plant transportation. It is heated outside the shell 4 with the intake and drain pipe. Heated at least 80° C. by heaters 3 in the main volume of the working tank 2.
  • bitumen in the local volume is heated in the shell 4 with the intake and drain pipe. Bitumen is heated by heaters 5 under the housing 4 with the intake and drain pipe of the working tank 2. Heated to a shipment temperature of not less than 140° C.

Bitumen is taken by pumps and fed to external transport or to the technological process. As bitumen is taken from under the shell 4 with the intake and drain pipe of the working tank 2, bitumen flows by gravity to its place. Bitumen comes from the main volume outside the casing of the working tank 2.

Introduction of the shell with the intake and drain pipe in the working tank and bringing bitumen in it to the temperatures of shipment to external transport or in the process allows to exclude horizontal or vertical tanks of intensive heating. The introduction of the shell allows for a reduction in energy consumption. Reducing at the expense of useful use of heat loss from the shell with the intake-discharge pipe for heating bitumen in the main storage volume. The introduction of the shell allows to ensure the preservation of bitumen quality. Preservation of quality due to the use of the shell with the intake and drain pipe. Use at the high-temperature stage of preparation. The pipe has a much smaller bitumen mirror area (oxidation area) than in horizontal or vertical tanks of intensive heating.

Introduction of the shell with the intake and drain pipe into the storage tank and heating to the temperature of in-plant bitumen transportation provides a reduction of energy costs. Heating only the local volume of bitumen under the shell with the intake and drainage pipe. The heat loss from the shell with the drainpipe is useful. The heat loss ensures that the bitumen in the main volume of the storage tank is warmed up and maintains its temperature.

Claims

1. The method of heating and dispensing bitumen in the above-ground bitumen storage and bitumen terminal is that bitumen is heated in the storage tank in a casing installed in it with the intake-drain pipe. Bitumen is heated to a temperature of in-plant transportation at least 80° C. wherein in the main storage tank volume outside the housing with the intake- drain pipe bitumen is heated and maintained by heaters and heated at a temperature not lower than the flow temperature 60° C.wherein in this case the bitumen supply from the volume under the storage tank shell with the intake and drain pipe in the main volume of the working tank is carried out as the bitumen is dispensed from the working tankwherein heating of bitumen in the working tank is carried out in a casing installed in it with the intake and drain pipewherein heating to a working temperature of not less than 140° C. Heating with subsequent release to an external transport or in the technological process wherein in the main volume of the working tank, outside the housing preferably comprising the suction and drainage pipe, bitumen is heated to a temperature not lower than 80° C. for in-plant transportation of bitumenwherein Bitumen heating is maintained by heaters and bitumen in the storage tank is also heated and supported by heaters throughout the storage tank wherein bitumen is transported at a temperature not lower than 80° C. and bitumen is also fed into the main volume of the working tank. Bitumen is fed as used bitumen from the working tankwherein heating is maintained by heaters and bitumen in the working tank is also heated under the housing with the suction and drainage pipe and heating is carried out to a working temperature of not less than 140° C. wherein heating is conducted with subsequent release on an external transport or in the technological process and wherein in the main volume of the working tank, outside the housing with the suction and drainage pipe, bitumen is heated and maintained by heaters. This takes place at a temperature of in-plant transportation of bitumen not lower than 80° C.