JP2014214938A - Fuel supply device and method of petroleum residue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device and a method of petroleum residue capable of efficiently and safely mixing and fusing petroleum residue and heavy oil.SOLUTION: A fuel supply device 1 of petroleum residue includes: a mixture tank 2 for mixing solidified petroleum residue and heavy oil; a heating heater 3 for heating the petroleum residue and heavy oil in the mixture tank 2 at a volatilization allowable temperature of heavy oil or less; and a transportation pump 4 and a transportation pipe 8 for transporting the mixture oil generated in the mixture tank 2 to the furnace of a boiler 10.

Description

  The present invention relates to an oil residue fuel supply apparatus and method for supplying an oil residue by-produced in an oil refining process as a fuel for a boiler or the like.

  In the oil refining process, residual oil cracking equipment such as Solvent De-Asphalting (SDA) equipment may be installed in the plant in order to reduce heavy oil and increase the amount of lightened petroleum products. . SDA equipment extracts light fractions from heavy oil to the maximum extent. As a result, high-viscosity petroleum residues (also referred to as “SDA pitch”) are by-produced in the SDA apparatus. Therefore, in order to effectively use the SDA pitch, the SDA pitch may be applied as, for example, boiler fuel.

  As a technology for supplying a petroleum residue to a boiler, Patent Document 1 discloses that a petroleum residue is brought into contact with liquefied natural gas, cooled and solidified to obtain a solid fuel, and the solid fuel is pulverized and supplied to a furnace. Technology is disclosed. Further, Patent Document 2 discloses a technique for mixing a petroleum residue with heavy oil, and conveying the mixed oil, which is dissolved and fluidized, to a furnace.

JP 2009-300054 A JP 2012-21750 A

  In Patent Document 2, petroleum residue is heated while being mixed with heavy oil in a mixing tank. In paragraph [0031] of Patent Document 2, it is described that when the mixing tank is heated by a heater, it is desirable to set the solidified petroleum residue to 50 ° C. or higher at which melting starts. There is no suggestion about the upper limit of conditions.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuel supply apparatus and method for petroleum residue capable of mixing and melting petroleum residue and heavy oil efficiently and safely. And

In order to solve the above problems, the petroleum residue fuel supply apparatus and method of the present invention employ the following means.
That is, the petroleum residue fuel supply apparatus according to the present invention includes a mixing unit that mixes solidified petroleum residue and heavy oil, and the mixing at a temperature higher than a softening temperature of the petroleum residue and lower than a permissible volatilization temperature of the heavy oil. The heating part which heats the said petroleum residue and the said heavy oil in a part, and the conveyance part which conveys the mixed oil produced | generated in the said mixing part to a furnace.

According to this configuration, when the petroleum residue and the heavy oil are mixed, since the temperature is equal to or higher than the softening temperature of the petroleum residue, the viscosity of the petroleum residue is reduced, and the petroleum residue is easily mixed with the heavy oil. Moreover, when mixing petroleum residue and heavy oil, since it is below the volatilization allowable temperature of heavy oil, the volatilization amount of heavy oil can be restrained small.
Here, the petroleum residue is, for example, SDA pitch, and is a residue produced as a by-product in a residual oil decomposing apparatus such as a solvent de-asphalting (SDA) apparatus. The petroleum residue has a high viscosity and is solidified at room temperature.
The softening temperature of the petroleum residue is a temperature at which the surface of the solidified petroleum residue starts to soften when the petroleum residue is heated. The volatilization allowable temperature of heavy oil is a temperature determined by the amount of heavy oil that volatilizes by raising the temperature from room temperature.

  In the above invention, the volatilization allowable temperature of the heavy oil is obtained when the weight within the range of more than 0% and 20% or less of the total weight of the heavy oil at normal temperature is decreased by raising the temperature of the heavy oil from normal temperature. It may be temperature.

  According to this configuration, even when the volatilization allowable temperature is reached at the time of mixing, only the weight within the range of more than 0% and 20% or less of the total weight of heavy oil at normal temperature is reduced, so that the volatilization amount of heavy oil is kept small. It is done.

  Further, the fuel supply method of the petroleum residue according to the present invention includes a step of mixing the solidified petroleum residue and heavy oil, and mixing at a temperature higher than a softening temperature of the petroleum residue and not higher than a volatilization allowable temperature of the heavy oil. Heating the petroleum residue and the heavy oil, and mixing and heating the mixed oil produced by heating to a furnace.

  According to the present invention, petroleum residue and heavy oil can be mixed and melted efficiently and safely.

It is a schematic block diagram which shows the fuel supply apparatus which concerns on one Embodiment of this invention. It is a graph which shows the relationship between the weight of heavy oil, and temperature.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a petroleum residue fuel supply apparatus 1 according to an embodiment of the present invention includes a mixing tank 2, a heater 3, a transport pump 4, an oil heater 5, and the like. The fuel supply device 1 mixes petroleum residue and heavy oil to generate a molten mixed oil, and then supplies the fluidized mixed oil to, for example, the boiler 10.
The petroleum residue is, for example, SDA pitch produced as a by-product in a residual oil decomposing apparatus such as a solvent de-asphalting (SDA) apparatus. The SDA pitch has a high viscosity and is solidified at room temperature.

The mixing tank 2 is charged with petroleum residue and heavy oil. A stirring blade 7 is installed inside the mixing tank 2. Further, the heater 3 is provided around the heater 3, for example, below the heater 3 as shown in FIG. 1. The petroleum residue and heavy oil charged in the mixing tank 2 are heated by the heater 3 while being mixed by the stirring blade 7.
By heating the petroleum residue and heavy oil while being mixed, the petroleum residue is melted to produce a fluidized mixed oil.

  The heating of the petroleum residue or heavy oil may be performed after mixing both in the mixing tank 2 or may be mixed with the heavy oil after heating only the petroleum residue in the mixing tank 2. Alternatively, the petroleum residue may be put into the mixing tank 2 after the petroleum residue is heated in advance outside the mixing tank 2. Alternatively, only the heavy oil may be heated in the mixing tank 2 and then the petroleum residue may be charged into the mixing tank 2.

  The transport pump 4 supplies the mixed oil generated in the mixing tank 2 to the boiler 10. The transport pipe 8 connects the mixing tank 2 and the boiler 10, and the mixed oil passes through. The transport pipe 8 is provided with a transport pump 4 and an oil heater 5. The oil heater 5 heats the mixed oil flowing in the transport pipe 8 to a predetermined combustion viscosity range.

  The boiler 10 is provided with a plurality of burners 11, and the mixed oil supplied from the mixing tank 2 through the transport pipe 8 is burned in the furnace. The water pipe of the boiler 10 is supplied with water from one end, and steam is generated from the other end of the water pipe when the water pipe is heated by the combustion heat of the mixed oil.

  The heavy oil charged into the mixing tank 2 acts as a viscosity modifier for melting the petroleum residue. Heavy oil is suitable that is lighter than the solidified petroleum residue and has high affinity with the petroleum residue.

Next, the temperature at the time of mixing petroleum residue and heavy oil will be described.
The temperature at the time of mixing the petroleum residue and heavy oil is adjusted to be not less than the softening temperature of the petroleum residue and not more than the allowable volatilization temperature of the heavy oil.

  Here, the softening temperature of the petroleum residue is a temperature at which the surface of the solidified petroleum residue starts to soften when the petroleum residue is heated. When the petroleum residue is heated above the softening temperature, the softened petroleum residue starts to deform. Further, at a temperature lower than the softening temperature, the surface of the petroleum residue is solidified. In addition, the softening temperature of a petroleum residue changes with every petroleum residue by the difference in the component contained in a petroleum residue.

The allowable volatilization temperature of heavy oil is a temperature determined by the allowable volatilization amount of heavy oil that volatilizes by raising the temperature from room temperature. For example, the volatilization allowable temperature of heavy oil is the temperature at which the weight within the range of more than 0% and 20% or less of the total weight of heavy oil at normal temperature is lowered by raising the temperature from normal temperature. At this time, if heavy oil is maintained at a volatilization allowable temperature, the light fraction in heavy oil will volatilize the weight within the range of more than 0% and not more than 20% of the total weight of heavy oil at normal temperature. For example, if the volatile permissible temperature of heavy oil is determined to be the temperature at which 3% of the total weight of heavy oil at normal temperature falls, if the heavy oil is maintained at the volatile permissible temperature, the light fraction in heavy oil 3% of the total weight of heavy oil at normal temperature is volatilized.
When heavy oil is heated above the allowable evaporation temperature of heavy oil, more light fractions are volatilized from heavy oil. As a result, the viscosity of the mixed oil increases and the calorific value of the mixed oil decreases. In addition, the outflow and diffusion of volatile gases become widespread. Therefore, an appropriate volatilization allowance for heavy oil is more than 0% and not more than 20%.

  The allowable volatilization temperature of heavy oil is, for example, the level at which the volatilization amount accompanying the temperature rise of heavy oil is flat when the temperature is relatively low, and when the volatilization amount increases at a certain temperature, the volatilization amount starts to increase. .

Alternatively, the allowable volatilization temperature of heavy oil is, for example, as shown in FIG. 2, when the amount of volatilization accompanying the temperature increase of heavy oil increases gradually even at a relatively low temperature (that is, the weight of heavy oil decreases gently). In other cases, it may be determined by the volatilization allowance of heavy oil. The volatilization allowance of heavy oil refers to the volatilization amount of heavy oil that can be tolerated when petroleum residue and heavy oil are mixed. FIG. 2 is a graph showing a change in the weight of heavy oil when a certain heavy oil is heated. The weight of heavy oil was measured with a thermobalance. In FIG. 2, the temperature range at the time of mixing of a petroleum residue and heavy oil when the softening temperature of a petroleum residue is 150 degreeC and the volatilization allowable temperature of heavy oil is 200 degreeC is illustrated.
The volatilization allowance of heavy oil is determined by, for example, the degree and rate of change in the viscosity of the mixed oil, the degree and rate of change in the calorific value of the mixed oil, or the volume and rate of change of the light fraction that volatilizes. Is done.

  As described above, the temperature at which the petroleum residue and heavy oil are mixed is equal to or higher than the softening temperature of the petroleum residue, so that the viscosity of the petroleum residue is small and the petroleum residue is easily mixed with the heavy oil. Moreover, since the temperature at the time of mixing a petroleum residue and heavy oil is below the allowable volatilization temperature of heavy oil, the volatilization amount of heavy oil can be suppressed small. Heavy oil tends to increase in viscosity with an increase in the volatilization amount of the light fraction. However, by suppressing the volatilization amount of heavy oil to a small amount, the increase in viscosity of the mixed oil can be reduced. For example, the kinematic viscosity of the petroleum residue can be lowered to a value suitable for transportation by piping and spraying with a boiler.

  In addition, when the light fraction volatilizes from heavy oil, the total amount of heavy oil decreases, so the amount of mixed oil produced also decreases, and the calorific value of the mixed oil decreases. , It is possible to reduce the decrease in the heat generation amount of the mixed oil. Furthermore, by suppressing the volatilization amount of heavy oil to a small amount, the outflow and diffusion of volatile gas can be suppressed.

Next, the operation of the petroleum residue fuel supply apparatus 1 will be described.
First, petroleum residue and heavy oil are charged into the mixing tank 2. The petroleum residue and heavy oil inside the mixing tank 2 are heated by the heater 3 while being mixed by the stirring blade 7. As a result, the petroleum residue is melted and fluidized mixed oil is produced. The mixed oil produced in the mixing tank 2 is supplied to the boiler 10 by the transport pump 4 via the transport pipe 8. The mixed oil is heated to a predetermined combustion viscosity range by an oil heater 5 provided in the transport pipe 8.
And the mixed oil supplied to the boiler 10 is introduce | transduced into a furnace from the burner 11, and is burned with a furnace.

  The petroleum residue can be taken out in a petroleum refining facility and transported in a solid state. The solidified petroleum residue can be fluidized by the petroleum supply device 1. Therefore, if the fuel supply device 1 is installed in the vicinity of the boiler 10, the distance of the transport pipe to the boiler 10 required to supply the petroleum residue is larger than when the liquid petroleum residue is supplied from the oil refining facility. It can be shortened and the handling of petroleum residues can be facilitated. Moreover, according to the fuel supply apparatus 1 of this embodiment, compared with the technique of patent document 1, the enlargement and complication of the whole apparatus can be avoided.

  A mill (not shown) may be installed on the upstream side of the mixing tank 2 so that the petroleum residue is pulverized by the mill and then charged into the mixing tank 2. By reducing the particle size of the petroleum residue by pulverization, it is possible to shorten the mixing time of the petroleum residue and heavy oil and to reduce the size of the mixing tank 2.

Moreover, although embodiment mentioned above demonstrated the case where a petroleum residue and heavy oil were mixed with the mixing tank 2, this invention is not limited to this example. For example, petroleum residue and heavy oil may be mixed in the pipe without installing the mixing tank 2. At this time, the piping corresponds to the mixing section. Then, when the pipe is heated by the heater 3, the petroleum residue is melted inside the pipe, and fluidized mixed oil is generated. And the mixed oil produced | generated by piping is supplied to the boiler 10 via the oil heating part 5. FIG. In this case, it is desirable that the petroleum residue is previously pulverized by a mill.
In this modification, a mixing tank is not required, and the mixing unit can be simplified and the equipment cost can be reduced.

  As mentioned above, according to this embodiment and a modification, the temperature at the time of mixing of a petroleum residue and heavy oil is adjusted more than the softening temperature of a petroleum residue, and below the volatilization allowable temperature of heavy oil. As a result, the temperature at which the petroleum residue and heavy oil are mixed is equal to or higher than the softening temperature of the petroleum residue, so that the viscosity of the petroleum residue is small and the petroleum residue is easily mixed with the heavy oil. In addition, since the temperature when mixing petroleum residue and heavy oil is below the permissible temperature of heavy oil volatilization, the amount of heavy oil volatilization can be reduced, while reducing the increase in viscosity and heat generation of the mixed oil, The outflow and diffusion of volatile gas can be suppressed.

  In the present invention, when petroleum residue and heavy oil are mixed and dissolved, by reducing the volatilization amount of heavy oil, it is possible to suppress the outflow and diffusion of volatile gas while reducing the increase in viscosity of the mixed oil and the decrease in calorific value. This is due to the finding that it is desirable to keep the temperature during heating below the permissible volatilization temperature.

1 Fuel supply device 2 Mixing tank (mixing unit)
3 Heating heater (heating unit)
4 Transport pump (conveyance section)
5 Oil heater 7 Stirring blade 8 Transport pipe (conveyance section)
10 Boiler 11 Burner

Claims (3)

A mixing section for mixing the solidified petroleum residue and heavy oil;
A heating unit that heats the petroleum residue and the heavy oil in the mixing unit at a softening temperature of the petroleum residue or more and a volatile permissible temperature of the heavy oil or less.
A transport unit that transports the mixed oil generated in the mixing unit to a furnace;
An oil residue fuel supply device comprising:   The volatile permissible temperature of the heavy oil is a temperature at which the weight within the range of more than 0% and not more than 20% of the total weight of the heavy oil at normal temperature is lowered by raising the temperature of the heavy oil from normal temperature. Item 2. A fuel supply apparatus for petroleum residue according to Item 1. Mixing the solidified petroleum residue and heavy oil;
Heating the petroleum residue and the heavy oil that are mixed at a temperature equal to or higher than the softening temperature of the petroleum residue and equal to or lower than a permissible volatilization temperature of the heavy oil;
Conveying the mixed oil produced by mixing and heating to a furnace;
A method for supplying petroleum residue with fuel.

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