JP7330612B2 - boiler system - Google Patents

Description

The present invention relates to a boiler system including a boiler that produces steam.

Conventionally, in petroleum refining facilities such as refineries, crude oil is separated into a plurality of types of fractions (for example, naphtha, gasoline, light oil, heavy oil, etc.) that differ according to their boiling points using atmospheric distillation units. Of these, heavy oil is used as fuel for boilers and ships. However, since heavy oil contains impurities such as sulfur and nitrogen, it poses an environmental burden with fears of SOx or NOx emissions during combustion. It can be said that it is a big fuel. Therefore, it is expected that heavy oil will not be used as fuel in the future, and the demand for heavy oil will decrease.

In relation to this, a cracking apparatus is known in which heavy oil separated by an atmospheric distillation apparatus is further refined to extract a fraction with a lower boiling point such as gasoline (see, for example, Patent Document 1 below). Cracking units of this type make it possible to remove the high-demand fractions from the heavy oil again, with the result that flame-retardant petroleum residues are discharged as residue. Therefore, it is expected that the discharge amount of such petroleum residues will increase in the future.

As a utilization mode of petroleum residue, a mono-fired boiler using this as a fuel (hereinafter referred to as a petroleum residue-fired boiler) is known (see, for example, Patent Document 2 below). At present, residual oil boilers are often installed in oil refineries that discharge residual oil, and the steam required for cracking (reforming) of heavy oil is also installed in oil refineries. supplied in

As mentioned above, since the amount of residual oil emissions is expected to increase in the future, the oil residue-fired boiler will be installed in a separate area away from the oil refining facility, such as a petrochemical factory, a steel factory, etc. It is conceivable to install it in an area including factory facilities (residual petroleum utilization facilities) that use a large amount of steam. In this case, in order to stably generate steam using the residual oil boiler in the residual oil utilization facility, it is necessary to stably supply residual oil as fuel to the residual oil utilization facility.

JP 2008-297471 A JP 2012-107825 A

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a boiler system capable of stably supplying residual oil to a residual oil utilization facility.

In order to solve the above problems, a boiler system according to an aspect of the present invention includes a first boiler provided in a residue petroleum supply facility that generates residue petroleum, and a residue petroleum utilization facility separated from the residue petroleum supply facility. a second boiler provided in the oil residue supply facility and fueled by the oil residue transported from the oil residue supply facility; a steam supply line for supplying steam generated by the second boiler to the oil residue supply facility; It has

According to the above configuration, the residue petroleum supply facility is provided in the residue petroleum utilization facility separated from the residue petroleum supply facility, and the steam generated by the second boiler that uses the residue petroleum as fuel can be supplied through the steam supply line. Become. As a result, even if the first boiler installed in the residual oil supply facility is stopped or operated with limited output due to failure, repair, or disaster, steam is supplied to the residual oil production apparatus that produces residual oil. can be supplied. In this way, by increasing the redundancy of the steam supply to the residual oil production equipment, the residual oil is stably produced, and the residual oil, which serves as fuel for the second boiler provided in the residual oil utilization facility, is stably supplied. can supply. Therefore, steam can be stably generated in the oil residue utilization facility.

The boiler system includes a management device that acquires steam supply and demand information in the residual petroleum supply facility, and the management device calculates a steam demand amount in the residual petroleum supply facility from a steam supply amount in the residual petroleum supply facility. When the subtracted difference becomes equal to or less than a predetermined value, a steam request signal is transmitted to the second petroleum boiler, and when the second boiler receives the steam request signal, the second boiler supplies steam to the residue petroleum supply facility. can be supplied. Thereby, when the supply and demand balance in the residue petroleum supply facility becomes excessive demand or is likely to become excessive demand, the steam generated in the second boiler can be supplied to the residual petroleum supply facility.

The boiler system includes a first control device that controls the first boiler, and the first control device controls the second boiler when the amount of steam generated in the first boiler is equal to or less than a predetermined value. may transmit a steam request signal, and when the second boiler receives the steam request signal, the second boiler may operate so as to enable the supply of steam to the residue petroleum supply facility. Thereby, when the steam production amount of the first boiler is reduced, the steam produced in the second boiler can be supplied to the residual petroleum supply facility.

The boiler system includes a second control device that controls the second boiler, and the second control device controls, when receiving the steam request signal, the second control device compared to before receiving the steam request signal. You may control so that the amount of steam production in a boiler may be increased. By increasing the amount of steam generated in the second boiler, steam can be supplied from the second boiler provided in the residue petroleum utilization facility to the residue petroleum supply facility without reducing the amount of steam used in the residue petroleum utilization facility.

The second control device sets a first steam generation amount that is less than the maximum amount of steam that can be generated by the second boiler as the steam generation amount in the second boiler when the steam request signal is not received. Further, when the steam request signal is received, a second steam generation amount larger than the first steam generation amount may be set as the steam generation amount in the second boiler. In the case where steam is not supplied to the residue petroleum supply facility, the amount of steam generated by the second boiler is set to be less than the maximum amount of steam that can be generated by the boiler to leave a surplus capacity, so that the steam to the residue petroleum supply facility can be supplied. It is possible to prevent the shortage of the amount of steam to be supplied to the facility using the steam generated in the residual petroleum utilization facility before the supply of is started.

The boiler system includes a power generation device that generates power using the steam generated in the second boiler, and a second control device that controls the second boiler. Controlling the amount of steam supplied from the second boiler to the power generation device so as to supply a predetermined amount of the steam generated by the boiler to the power generation device, and when receiving the steam request signal, Control may be performed to reduce the amount of steam supplied from the second boiler to the power generator. Steam generated at the residual petroleum utilization facility before starting the supply of steam to the residual petroleum supply facility by reducing the amount of steam used for power generation when starting the supply of steam to the residual oil supply facility It is possible to prevent the shortage of the amount of steam supplied to the facility using the.

The boiler system includes a power generator that generates power using the steam generated by the second boiler, and a second controller that controls the second boiler, wherein the second controller controls the steam request When the signal is received, the amount of steam generated in the second boiler is controlled to increase compared to before the steam request signal is received, and in a state in which the amount of steam generated in the second boiler is increased, Furthermore, when it becomes necessary to supply steam to the residual petroleum supply facility, control may be performed so as to reduce the amount of steam supplied from the second boiler to the power generation device.

A boiler system according to another aspect of the present invention includes a plurality of steam generation facilities each provided separately from each other and equipped with boilers for generating steam, and steam generated by the boilers in one steam generation facility. and a steam supply line for supplying other steam generating facilities.

ADVANTAGE OF THE INVENTION According to this invention, a petroleum residue can be stably supplied to a petroleum residue utilization facility.

FIG. 1 is a block diagram showing a schematic configuration of a residual petroleum boiler system according to one embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a control system in the residual petroleum-fired boiler system shown in FIG. FIG. 3 is a block diagram showing a schematic configuration of a residual petroleum boiler system according to a modification of one embodiment of the present invention.

A boiler system according to an embodiment of the present invention will be described below. In the following, the boiler system will be described based on a residual petroleum boiler system including a residual oil boiler that generates steam using residual oil as fuel. FIG. 1 is a block diagram showing a schematic configuration of a residual petroleum boiler system according to one embodiment of the present invention. In FIG. 1, the flow of crude oil or residual petroleum fuel is indicated by dashed-dotted line arrows, the flow of steam generated in a petroleum residue-fired boiler, which will be described later, is indicated by broken line arrows, and the control flow is indicated by solid line arrows. is shown.

The residual oil-fired boiler system 1 includes a first boiler 9 provided in the residual oil supply facility 2 and a second boiler 7 provided in the residual oil utilization facility 3 . The residual petroleum supply facility 2 is, for example, a refinery or the like equipped with a petroleum refinery. The petroleum residue supply facility 2 comprises a cracker 4 for cracking heavy oil to produce petroleum residue. In this embodiment, the residual petroleum supply facility 2 further includes an atmospheric distillation device 5 . The atmospheric distillation unit 5 is configured to separate crude oil into a plurality of types of fractions (for example, naphtha, gasoline, light oil, heavy oil, etc.) with different boiling points. The heavy oil separated by the atmospheric distillation unit 5 is supplied to the cracking unit 4 . The atmospheric distillation unit 5 discharges atmospheric residual oil, which is the residue remaining after each fraction has been separated. Cracker 4 is configured to crack heavy oil to remove lower boiling fractions such as gasoline. At this time, the cracker 4 discharges the remaining residue after extracting the low boiling point fraction from the heavy oil as a petroleum residue. The petroleum residue supply facility 2 may be equipped with a vacuum distillation device (not shown). The vacuum distillation unit further distills and separates the atmospheric residual oil separated by the atmospheric distillation unit 5 to take out vacuum gas oil. The vacuum distillation unit discharges vacuum residue, which is the residue left after the vacuum gas oil is separated. The petroleum refinery includes at least one of the atmospheric distillation unit 5, the cracking unit 4 and the vacuum distillation unit as described above.

Furthermore, the residual petroleum supply facility 2 comprises a management device 6 . The management device 6 is configured as a computer including an arithmetic device, a storage device, and the like (not shown). The management device 6 acquires and manages data on the types, components, or properties (hereinafter referred to as properties, etc.) of crude oil or petroleum residues. For example, the residual petroleum supply facility 2 performs component analysis for each lot of supplied crude oil, and stores the properties and the like in the management device 6 together with the lot number. Additionally or alternatively, component analysis may be performed on crude oil or petroleum residues at different crude oil extraction locations.

The oil residue utilization facility 3 includes a boiler (second boiler) 7 that generates steam. In the present embodiment, the second boiler 7 is a petroleum residue-fired boiler that uses petroleum residue as fuel. The second boiler 7 generates steam by burning the petroleum residue as fuel. The oil residue utilization facility 3 includes a steam utilization plant 8 that manufactures products using the steam generated by the second boiler 7 .

The residue petroleum utilization facility 3 is provided separately from the residue petroleum supply facility 2 . That is, the residue petroleum supply facility 2 and the residue petroleum utilization facility 3 are clearly partitioned as different partitions. In the example of FIG. 1, the residue petroleum supply facility 2 and the residue petroleum utilization facility 3 are separated by at least one public road R1. In addition, the aspect of division is not limited to this. For example, the residual petroleum supply facility 2 and the residual petroleum utilization facility 3 may be separated by at least one fence and at least one driveway. Moreover, the residual oil supply facility 2 and the residual oil utilization facility 3 may have different owners, operators, or users of the facilities 2 and 3 . The oil residue utilization facility 3 is, for example, a factory facility that uses a large amount of steam, such as a petrochemical factory, a steel factory, a paper factory, or a power plant. For example, the oil residue utilization facility 3 is provided in an industrial zone.

The oil residue supply facility 2 is also provided with a boiler (first boiler) 9 . In the present embodiment, the first boiler 9 is also a residual petroleum boiler. The residual petroleum supply facility 2 includes a steam utilization plant 10 that uses the steam generated by the first boiler 9 to refine petroleum and the like. In FIG. 1, the steam utilization plant 10 is shown as a facility separate from the cracking device 4 and the atmospheric distillation device 5, but the steam utilization plant 10 also includes the cracking device 4 and the atmospheric distillation device 5. included. Furthermore, if the petroleum residue supply facility 2 is equipped with a vacuum distillation unit, the steam utilization plant 10 also includes the vacuum distillation unit.

For example, in cracking unit 4 and atmospheric distillation unit 5 steam is used to heat the feedstock or the withdrawn fraction. Also in vacuum distillation units, steam is used to heat the feedstock or the withdrawn fraction. Furthermore, the cracking device 4 is equipped with a stripper that blows steam into the heavy oil to extract low boiling point components. The steam generated in the first boiler 9 is supplied to the cracking device 4 as steam (stripping steam) blown into the heavy oil. Thus, in cracking unit 4 and atmospheric distillation unit 5, steam is required to produce petroleum residue.

The petroleum residue produced in the cracking device 4 of the residue petroleum supply facility 2 is conveyed to the first boiler 9 in the same facility and also to the second boiler 7 of the residue petroleum utilization facility 3 . The transportation of the residual oil to the first boiler 9 or the second boiler 7 is carried out, for example, by a belt conveyor (not shown) when the residual oil is solid, and by a residue supply pipe (not shown) when the residual oil is liquid. It may be done through Further, when the residue petroleum utilization facility 3 is located at a relatively remote location from the residue petroleum supply facility 2, for example, a truck equipped with a predetermined container for storing the residue petroleum, or a predetermined container is loaded. It may be transported by truck or the like.

The residual petroleum supply facility 2 is provided with a control device (first control device) 11 that controls the first boiler 9 . Similarly, the residual petroleum utilization facility 3 is provided with a control device (second control device) 12 that controls the second boiler 7 . These control devices 11 and 12 are provided with microcontrollers, storage devices, operation input devices, and the like.

The residual petroleum supply facility 2 can supply the steam generated by the first boiler 9 to an external steam utilization facility (not shown). Similarly, the residual petroleum utilization facility 3 can supply steam produced in the second boiler 7 to an external steam utilization facility (not shown). One or a plurality of external steam utilization facilities may be provided, or may not be provided. Further, there may be an external steam utilization facility to which steam can be supplied from both the residual petroleum supply facility 2 and the residual petroleum utilization facility 3 .

Further, the residual oil supply facility 2 and the residual oil utilization facility 3 are provided with power generators (steam power generators) 41 and 42 that generate power using the steam generated by the boilers 9 and 7, respectively. The power generators 41 and 42 may be provided inside the residue petroleum supply facility 2 or the residue petroleum utilization facility 3, or may be provided outside the facility. The steam supplied to the power generators 41 and 42 is exhausted after being used for power generation. This exhaust may be supplied to the steam utilization plant 10,8.

Note that FIG. 1 shows a configuration including one residue petroleum supply facility 2 and one residue petroleum utilization facility 3 as the residue petroleum boiler system 1 . Alternatively, one residue petroleum supply facility 2 and a plurality of residue petroleum utilization facilities 3 may be provided. The plurality of residual petroleum utilization facilities 3 may have the same structure as the above-described residual petroleum utilization facilities 3, or may have a different structure except for the boiler 7. FIG.

In this way, by providing the second boiler 7 in the factory facility that uses a large amount of steam as the residual oil utilization facility 3, it is possible to realize a stable supply of steam in the factory facility (residual oil utilization facility 3). can. In addition, by making it possible to supply the steam generated in the residue petroleum utilization facility 3 to the residue petroleum supply facility 2, steam can be exchanged between the residue petroleum supply facility 2 and the residue petroleum utilization facility 3. In addition, it is possible to more directly plan and set the proportion of the steam generated by the second boiler 7 that is used in the factory facilities and the proportion that is supplied to the power generation device 42 for power generation.

The residual petroleum-fired boiler system 1 includes a steam supply line (steam return line) 18 for supplying steam generated by the second boiler 7 to the residue petroleum supply facility 2 . The steam return line 18 is composed of a steam supply pipe or the like connected to a steam discharge port (not shown) of the second boiler 7 .

According to the above configuration, the residual oil supply facility 2 is supplied with steam generated by the second boiler 7 which is a residual oil fired boiler provided in the residual oil utilization facility 3 separated from the residual oil supply facility 2. It can be supplied through line (vapor return line) 18 . As a result, even if the first boiler 9 provided in the residual oil supply facility 2 is stopped or operated with limited output due to failure, repair, or occurrence of a disaster, the residual oil production apparatus that produces residual oil. The steam can be supplied to the cracking unit 4 or the atmospheric distillation unit 5, which is . In this way, by increasing the redundancy of the steam supply to the cracking device 4, the residual petroleum oil is stably generated, and the residual petroleum oil to be used as fuel is stably supplied to the second boiler 7 provided in the residual oil utilization facility 3. can be supplied Therefore, steam can be stably generated in the residual petroleum utilization facility 3 .

The steam return line 18 is provided with an on-off valve 20 at least on the side of the second boiler 7 (on the downstream side in the steam flow direction), and is configured to be able to switch between flow and shutoff of steam through the steam return line 18 . In addition to or instead of this, an on-off valve may be provided on the steam return line 18 on the petroleum residue supply relocation 2 side (the downstream side in the steam flow direction).

The second control device 12 may control opening and closing of the on-off valve 20 when the steam generated by the second boiler 7 is conveyed through the steam return line 18 . Alternatively, the on-off valve 20 may be opened and closed manually.

Furthermore, the steam generated by the first boiler 9 can also be supplied to the residual petroleum utilization facility 3 . For example, although not shown, the residual petroleum boiler system 1 may include a steam supply line (steam distribution line) for supplying the steam generated by the first boiler 9 to the residual oil utilization facility 3 . Such a steam distribution line is composed of a steam supply pipe or the like connected to a steam discharge port (not shown) of the first boiler 9 . The steam distribution line is provided with an on-off valve (not shown) at least on the side of the first boiler 9 (on the upstream side in the steam flow direction), and is configured to be able to switch between flow and shutoff of steam through the steam distribution line. As a result, the steam generated by the first boiler 9 can be supplied to the steam utilization plant 8 of the residual petroleum utilization facility 3 and the like.

Also, the steam distribution line may be provided between the first boiler 9 and a steam utilization facility other than the residual petroleum utilization facility 3 . As a result, the steam generated by the first boiler 9 can be supplied to the steam utilization facility without the oil residue utilization facility 3 .

In the present embodiment, the management device 6 of the residue petroleum supply facility 2 is configured to acquire supply and demand information of steam in the residue petroleum supply facility 2 . The management device 6 requests the residue petroleum utilization facility 3 to supply steam via the steam return line 18 based on the steam supply and demand information in the residue petroleum supply facility 2 .

The management device 6 is communicably connected to the steam utilization plant 10 including the atmospheric distillation device 5 and the cracking device 4 , and is configured to be able to acquire information on the steam demand from the steam utilization plant 10 . The management device 6 stores the amount of steam required in the steam amount plant 10 as the amount of steam demanded in the residual petroleum supply facility 2 . When the steam generated by the first boiler 9 is supplied to the external steam utilization facility, the amount of steam required by the external steam utilization facility is included in the demand for steam in the residual petroleum supply facility 2. good too. In this case, the management device 6 is communicably connected to an external steam utilization facility capable of supplying steam from the first boiler 9, and is configured to be able to obtain information on the demand for steam from the external steam utilization facility. good too. The management device 6 stores the amount of steam obtained by adding the amount of steam required by the external steam utilization facility to the amount of steam required by the steam utilization plant 10 as the demand amount of steam in the residual petroleum supply facility 2. .

FIG. 2 is a block diagram showing the configuration of a control system in the residual petroleum-fired boiler system shown in FIG. As shown in FIG. 2 , the management device 6 of the residue petroleum supply facility 2 is communicably connected to a first control device 11 that controls the first boiler 9 in the residue petroleum supply facility 2 . The management device 6 and the first control device 11 may be connected by a LAN or the like, or may be connected via a predetermined communication network 15 described below.

The first control device 11 acquires information on the amount of steam generated by the first boiler 9 at a predetermined timing, and transmits the information to the management device 6 . The management device 6 stores the steam generation amount of the first boiler 9 acquired from the first control device 11 as the steam supply amount (the steam amount that can be supplied from the first boiler 9) in the residual petroleum supply facility 2 .

Furthermore, the management device 6 is communicably connected to a second control device 12 that controls the second boiler 7 in the residual petroleum utilization facility 3 via a predetermined communication network 15 such as the Internet.

When the difference ΔV (=VS−VD) obtained by subtracting the steam demand VD at the residue petroleum supply facility 2 from the steam supply amount VS at the residue petroleum supply facility 2 becomes equal to or less than a predetermined value Vth, the management device 6 A steam request signal Sd is transmitted to (the second controller 12 of) the second boiler 7 . When receiving the steam request signal Sd, the second controller 12 of the second boiler 7 controls the second boiler 7 so as to allow steam to be supplied to the residual petroleum supply facility 2 . A portion of the steam produced in the second boiler 7 is supplied to the residual petroleum supply facility 2 through a steam return line 18 .

The predetermined value Vth, which serves as a reference for transmitting the steam request signal Sd, may be 0 or may be a positive value. That is, when the steam supply amount VS and the demand amount VD match, or when the steam supply amount VS is greater than the demand amount VD but it is determined that the steam demand amount VD may exceed the supply amount VS. , the steam request signal Sd is transmitted.

As a result, the steam generated in the second boiler 7 can be supplied to the residue petroleum supply facility 2 when the supply and demand balance in the residue petroleum supply facility 2 becomes excessive or is likely to become excessive.

In the present embodiment, when receiving the steam request signal Sd, the second control device 12 operates so as to enable steam to be supplied to the residual petroleum supply facility 2 compared to before receiving the steam request signal Sd. is controlled to increase the amount of steam generated in the second boiler 7. By increasing the amount of steam generated in the second boiler 7, steam is supplied from the second boiler 7 provided in the residual oil utilization facility 3 to the residual oil supply facility 2 without suppressing the amount of steam used in the residual oil utilization facility 3. can do.

The amount of steam supplied from the second boiler 7 to the residue petroleum supply facility 2 in one steam request signal Sd may be the amount of steam required (shortage) in the residue petroleum supply facility 2 . In this case, for example, the steam request signal Sd includes information about the steam shortage. Information on the amount of steam shortage may be the difference ΔV (=VS−VD) in the residual petroleum supply facility 2, or a shortage level in which a plurality of levels are determined stepwise based on this ΔV. good. When the steam request signal Sd includes a shortage level, the amount of steam to be supplied to the residue petroleum supply facility 2 corresponding to each of a plurality of shortage levels is stored in advance in the second controller 12 . The second control device 12 reads out the shortage level contained in the steam demand signal Sd, and supplies the corresponding steam to the residue petroleum supply facility 2 .

Alternatively, the amount of steam supplied from the second boiler 7 to the residual petroleum supply facility 2 in one steam request signal Sd may be a predetermined amount regardless of the difference ΔV. In this case, the steam request signal Sd may not contain information about the amount of steam to be supplied to the residual petroleum supply facility 2 .

A control mode of the second boiler 7 will be described in more detail. The second controller 12 is configured to control the second boiler 7 with different loads before and after receiving the steam demand signal. When the second control device 12 has not received the steam request signal, the first steam generation amount V1 less than the maximum amount VM of steam that can be generated by the second boiler 7 is set to the steam generation amount in the second boiler 7 ( 1st load). For example, the first steam generation amount V1 is set to 80% of the maximum amount VM.

When receiving the steam request signal Sd, the second control device 12 sets a second steam production amount V2 larger than the first steam production amount V1 as the steam production amount (second load) in the second boiler 7 . For example, the second steam generation amount V2 is set to the maximum amount VM (100%) of steam that the second boiler 7 can generate.

In this way, the amount of steam generated by the second boiler 7 is set to be less than the maximum amount VM of steam that can be generated by the second boiler 7 when the steam is not supplied to the residual petroleum supply facility 2 to leave a surplus capacity. As a result, the amount of steam used in the residual oil utilization facility 3 and the steam generated in the residual oil utilization facility 3 are supplied (supply (possible) can be prevented from running out of steam.

Note that the management device 6 can continue to acquire steam supply and demand information in the residue petroleum supply facility 2 even when steam is being supplied from the second boiler 7 . For example, when the steam return line 18 is laid between the residue petroleum supply facility 2 and the plurality of residue petroleum utilization facilities 3, the management device 6 controls any one of the residue petroleum utilization facilities 3 to A steam request signal Sd is transmitted to the second boiler 7 provided in the residue utilization facility 3 .

When the management device 6 determines that the supply and demand balance in the residual petroleum supply facility 2 has become or is likely to become excessive in a state where steam is being supplied from the second boiler 7 , the steam request signal Sd is sent to the second boilers 7 provided in the other of the residual oil utilization facilities 3 among the plurality of residual oil utilization facilities 3 . In this way, steam can be supplied from a plurality of residue petroleum utilization facilities 3 according to the supply and demand balance at the residue petroleum supply facility 2 . In this case, the steam supply amount VS includes the steam amount already supplied from the oil residue utilization facility 3 (second boiler 7).

In addition, the management device 6 transmits the steam request signal Sd to all of the plurality of second control devices 12 that control the plurality of second boilers 7 capable of supplying steam to the residual petroleum supply facility 2, and the respective second control devices 12, and may determine the second boiler 7 to supply steam based on the information included in the steam supply availability signal.

As a criterion for selecting one residue petroleum utilization facility 3 from a plurality of residue petroleum utilization facilities 3, for example, the distance between the residue petroleum supply facility 2 and the residue petroleum utilization facility 3 (the length of the steam return line 18) may be used to set the priority order for selecting the oil residue utilization facility 3 in order of shortest distance. Alternatively, using the supply and demand information in each oil residue utilization facility 3 at the time of transmitting the steam demand signal Sd as the above criteria, in order of steam supply margin (for example, in descending order of the amount obtained by subtracting the demand amount from the supply amount). An order of priority for selecting the residual petroleum utilization facility 3 may be set. Alternatively, as the above criterion, the operating status of the second boiler 7 provided in each oil residue utilization facility 3 when the steam request signal Sd is transmitted (the ratio of the current steam generation amount to the maximum amount of steam that can be generated VM ( %)) may be used to set the order of priority for selecting the oil residue utilization facilities 3 in order of lightest load (lowest percentage).

When the second boiler 7 for supplying steam is determined based on the supply and demand status of the residue oil utilization facility 3 , information on the supply and demand status of the residue oil utilization facility 3 is included in the steam supply enable/disable signal. Similarly, when determining the second boiler 7 to supply steam based on the operating status of the second boiler 7 , the steam supply enable/disable signal includes information about the operating status of the second boiler 7 .

It should be noted that the steam request signal Sd may be transmitted to all the residual petroleum utilization facilities 3, and steam may be supplied from all the second boilers 7 that have received the steam request signal Sd, without setting the priority. In this case, the amount of steam to be supplied to the residual petroleum supply facility 2 or its ratio may be set in advance for each second boiler 7 .

Furthermore, in the present embodiment, the first control device 11 transmits the steam request signal Sd to the second boiler 7 when the amount of steam generated in the first boiler 9 becomes equal to or less than the predetermined value VG. Therefore, the second control device 12 of the second boiler 7 enables the second boiler 7 to supply steam to the residual petroleum supply facility 2 when the amount of steam generated in the first boiler 9 becomes equal to or less than the predetermined value VG. Such operation is performed to supply steam to the residual petroleum supply facility 2 .

As a result, the steam generated in the second boiler 7 can be supplied to the residue petroleum supply facility 2 when the amount of steam generated in the first boiler 9 decreases. Therefore, for example, if the first boiler 9 stops due to a failure, or if the first boiler 9 cannot be operated due to repair work, a disaster or the like occurs in the oil residue supply facility 2, and the first boiler 9 stops or outputs It is possible to ensure the supply amount VS of steam in the residual petroleum supply facility 2 even when a limited operation such as restriction is being performed.

Furthermore, in the present embodiment, the second control device 12 controls the flow from the second boiler 7 to the power generation device 42 so as to supply the power generation device 42 with a predetermined amount of the steam generated by the second boiler 7 . It controls the amount of steam supplied. The predetermined amount of steam supplied to the power generation device 42 may be an absolute amount, or may be an amount based on a predetermined ratio with respect to the amount of steam generated in the second boiler 7 . When the second control device 12 receives the steam request signal Sd, the second control device 12 reduces the amount of steam supplied from the second boiler 7 to the power generation device 42 as an operation that allows steam to be supplied to the residue supply facility 2. may be controlled to

In this case, the reduced amount of steam is supplied to the residue petroleum supply facility 2 . For example, when steam is not supplied to the residue petroleum supply facility 2, 50% of the steam generated in the residue petroleum utilization facility 3 is supplied to the power generation device 42, and steam is supplied to the residue petroleum supply facility 2, 30% of the amount of steam generated in the second boiler 7 may be supplied to the power generator 42 and 20% of the difference may be supplied to the residual petroleum supply facility 2 . By reducing the amount of steam used for power generation when starting to supply steam to the residual oil supply facility 2, steam is used in the residual oil utilization facility 3 before and after starting the supply of steam to the residual oil supply facility 2. It is possible to prevent the amount of steam applied from changing.

The control for reducing the amount of steam supplied to the power generation device 42 may be executed independently (in parallel) with the control for increasing the amount of steam generated by the second boiler 7 . Instead of this, the second control device 12 preferentially executes control to increase the amount of steam generated by the second boiler 7, and when it becomes necessary to supply steam to the residual petroleum supply facility 2, power generation is performed. Control may be performed to reduce the amount of steam supplied to device 42 . For example, when the second boiler 7 is supplying steam to the residual petroleum supply facility 2 by increasing the amount of steam generated by the second boiler 7 , when the steam request signal Sd is further received, the second controller 12 sends the power generator 42 to may be executed to reduce the amount of steam supplied. Further, when the amount of steam to be supplied to the residual petroleum supply facility 2 is insufficient even if the amount of steam generated by the second boiler 7 is increased, the second control device 12 reduces the amount of steam supplied to the power generator 42. control may be exercised.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various improvements, changes, and modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, the first boiler 9 provided in the residual petroleum supply facility 2 is an oil residue-fired boiler, but the first boiler 9 may be a boiler other than the oil residue-fired boiler. For example, the first boiler 9 may be a gas-fired boiler that uses a predetermined gas as fuel, a boiler that uses fossil fuel such as a coal-fired boiler, or a waste heat boiler that uses exhaust heat from an incinerator. It is possible. Any type of boiler, such as a two-stage combustion type mono-fired boiler, may be used as the second boiler 7 as long as the oil residue is used as fuel. Further, the residual petroleum supply facility 2 may be provided with a steam generating device other than a boiler using a gas turbine or the like instead of the first boiler 9 .

Further, in the above-described embodiment, the residual petroleum supply facility 2 is configured as a petroleum refining facility including the atmospheric distillation device 5 and the cracking device 4 . In the above embodiment, the cracking device 4 is configured as a residue petroleum production device that produces residue petroleum. Therefore, the residual petroleum supply facility 2 does not have to be equipped with petroleum refining equipment such as the atmospheric distillation unit 5 or the like. That is, the residual petroleum supply facility 2 may be configured as a separate facility from the oil refining facility. Conversely, the residual petroleum supply facility 2 may be equipped with the atmospheric distillation unit 5 and without the cracking unit 4 . In this case, the atmospheric residue or the like produced in the atmospheric distillation unit 5 may be transported to the oil residue utilization facility 3 as the oil residue. That is, the residual petroleum producing device may be the atmospheric distillation device 5 . Further, when the residue petroleum supply facility 2 is equipped with a vacuum distillation device, vacuum residual oil or the like produced in the vacuum distillation device may be transported to the residue petroleum utilization facility 3 as a petroleum residue. That is, the petroleum residue generator may be a vacuum distillation unit. Thus, petroleum residues in this specification and claims include residual oils or flame retardant oils produced in various units such as distillation units, cracking units or solvent deasphalting units in petroleum refining processes.

Further, in the above embodiment, the second boiler 7 of the residual oil utilization facility 3 is requested to supply steam based on the steam supply and demand information in the residual oil supply facility 2, and the first boiler 9 generates steam. Although the aspect of requesting steam supply to the second boiler 7 of the residual petroleum utilization facility 3 based on the quantity has been described, only one of the aspects may be performed.

Further, in the above-described embodiment, an aspect has been described in which the amount of steam generated by the second boiler 7 is reduced when steam is not supplied to the residual petroleum supply facility 2 compared to when steam is supplied. The amount of steam generated by the second boiler 7 may be kept unchanged depending on whether steam is supplied to the residual petroleum supply facility 2 or not. For example, when supplying steam to the residue petroleum supply facility 2, the supply of steam to a predetermined steam utilization plant 8 or steam utilization facility 14 may be stopped or the amount of steam supplied may be reduced.

Further, in the above embodiment, the steam generated by the second boiler 7 is supplied to the residual petroleum supply facility 2 through the steam return line 18, but the steam generated by the first boiler 9 is The control mode described in the above embodiment can be similarly applied to the case of supplying to the residual petroleum utilization facility 3 through the distribution line.

Also, a steam supply line may be provided between a plurality of residue petroleum utilization facilities 3 to enable distribution of steam between the plurality of residue petroleum utilization facilities 3 . FIG. 3 is a block diagram showing a schematic configuration of a residual petroleum boiler system according to a modification of one embodiment of the present invention. In the example of FIG. 3, the same reference numerals are assigned to the same configurations as in FIG. 1, and the description thereof is omitted. The oil residue-fired boiler system 1B in this modification includes a first steam generation facility 31 having a boiler 71 that generates steam, and a boiler 72 that is provided separately from the first steam generation facility 31 and generates steam. and a second steam generation facility 32 . In this modified example, the boilers 71 and 72 are configured as petroleum residue-fired boilers. Therefore, the steam generation facilities 31 and 32 correspond to the oil residue utilization facility 3 in the above embodiment.

Further, the residual petroleum boiler system 1B includes a first steam supply line 51 for supplying steam generated by the boiler 71 in the first steam generation facility 31 to the second steam generation facility 32 . Furthermore, the residual petroleum-fired boiler system 1</b>B includes a second steam supply line 52 for supplying steam generated by the boiler 72 in the second steam generation facility 32 to the first steam generation facility 31 . The control mode described in the above embodiment can also be applied to the control of steam transport through the steam supply lines 51 and 52 in the same manner.

According to this modification, by opening the on-off valve 53 provided in the first steam supply line 51, the steam generated in the boiler 71 of the first steam generation facility 31 is supplied to the second steam generation facility 32. can do. Similarly, the steam generated in the boiler 72 of the second steam generation facility 32 can be supplied to the first steam generation facility 31 by opening the on-off valve 54 provided in the steam supply line 52 .

In this manner, steam can be exchanged between the plurality of steam generation facilities 31 and 32 provided with the boilers 71 and 72 through the steam supply lines 51 and 52 . When the steam generating facilities 31 and 32 respectively generate and supply steam to be used in the steam generating facilities 31 and 32, the petroleum residue that serves as fuel for the boilers 71 and 72 runs short, or If the boilers 71 and 72 are stopped or operated with limited output due to failure, repair, or disaster, the supply of steam to the steam generation facilities 31 and 32 is interrupted, delaying various processing processes using steam. and other effects will occur.

On the other hand, according to the present modification, when the residual petroleum oil used as fuel for the boilers 71 and 72 provided in one of the plurality of steam generating facilities 31 and 32 runs short, or when the boilers 71 and 72 72 is stopped or is operating with limited output due to failure, repair, disaster, etc., supplying steam from another steam generating facility 32, 31 to the steam generating facility 31, 32 concerned. can be done. By increasing the redundancy of the steam supply between the plurality of steam generation facilities 31 and 32 in this way, the steam used in each of the steam generation facilities 31 and 32 and the steam supplied by each of the steam generation facilities 31 and 32 are It is possible to stably supply steam to the external steam utilization facility.

In addition, in this modification, the boilers 71 and 72 are explained based on the case where the boilers are oil residue-fired boilers. , a boiler other than a petroleum residue-fired boiler (for example, the above gas-fired boiler, a boiler using fossil fuel, a waste heat boiler, etc.).

Also, it is possible to similarly arrange steam supply lines 51 and 52 in three or more steam generating facilities. In this case, the steam supply line 52 may be common to several steam generation facilities. Further, depending on the steam generation facility, there may be a steam generation facility to which steam is not supplied from other steam generation facilities, or a steam supply facility to which steam is not supplied to other steam generation facilities. Moreover, in the example of FIG. 3, the steam supply lines 51 and 52 are configured such that the steam supply direction is constant. That is, a first steam supply line 51 that supplies steam to the second steam generation facility 32 and a second steam supply line 52 that supplies steam to the first steam generation facility 31 are provided separately. Alternatively, the steam supply lines 51 and 52 may be configured as a common line, and the steam supply direction may be switched depending on the situation.

Further, in the above-described embodiment, a mode in which the management device 6 that acquires the steam supply and demand information in the residue petroleum supply facility 2 is provided in the residue petroleum supply facility 2 has been described. That is, according to the above-described embodiment, in the residue petroleum supply facility 2, the supply and demand information of steam in the residue petroleum supply facility 2 is acquired, and when the supply and demand balance in the residue petroleum supply facility 2 becomes excessive demand or when there is excessive demand When the second boiler 7 in the residual petroleum utilization facility 3 is notified of the steam demand, steam is supplied from the second boiler 7 to the residual petroleum supply facility 2 . From a different point of view, in the residual oil utilization facility 3, when the supply and demand balance in the residual oil supply facility 2 becomes excessive or is likely to become excessive based on the supply and demand information of steam in the residual oil supply facility 2, The amount of steam produced in the second boiler 7 is increased, and steam is supplied to the petroleum residue supply facility 2 through the steam return line 18 .

Alternatively, the management device 6 may be provided in the residual petroleum utilization facility 3 . In this case, the management device 6 in the residual oil utilization facility 3 acquires the steam supply and demand information in the residual oil supply facility 2, and sends a steam request signal to the second control device 12 of the residual oil supply facility 2 provided with the management device 6. Sd may be sent. That is, the residue petroleum supply facility 2 may notify the residue petroleum supply facility 3 of steam supply and demand information in the residue petroleum supply facility 2 and receive steam supply from the second boiler 7 to the residue petroleum supply facility 2 . From a different point of view, the residual oil utilization facility 3 acquires the steam supply and demand information in the residual oil supply facility 2, and determines whether or not the supply and demand balance in the residual oil supply facility 2 has become excessive, or is likely to become excessive. If the supply and demand balance in the residual petroleum supply facility 2 becomes excessive or is likely to become excessive, the amount of steam generated in the second boiler 7 is increased, and the oil is supplied through the steam return line 18. Steam may be supplied to the residue supply facility 2 .

Further, in the above-described embodiment, a mode will be described in which the first control device 11 transmits the steam request signal Sd to the second boiler 7 when the amount of steam generated in the first boiler 9 becomes equal to or less than a predetermined value. did. That is, according to the above-described embodiment, in the residue petroleum supply facility 2, it is determined whether or not the amount of steam generated in the first boiler 9 has become equal to or less than a predetermined value, and if the amount of steam generated in the first boiler 9 has become equal to or less than the predetermined value, the residual petroleum residue is utilized. A request for steam is sent to the second boiler 7 in the facility 3 , and steam is supplied from the second boiler 7 to the residue petroleum supply facility 2 . From a different point of view, in the residual petroleum utilization facility 3, when the amount of steam generated in the first boiler 9 falls below a predetermined value, the amount of steam generated in the second boiler 7 is increased and the residue is supplied through the steam return line 18. Supply steam to Facility 2.

Alternatively, the management device or the second control device 12 provided in the residual petroleum utilization facility 3 may determine whether or not the amount of steam generated in the first boiler 9 has become equal to or less than a predetermined value. In this case, information on the amount of steam generated in the first boiler 9 is periodically transmitted from the first boiler 9 to the residual oil utilization facility 3, and the management device or the second control device 12 of the residual oil utilization facility 3 transmits the information. It is determined whether or not the steam generation amount has become equal to or less than a predetermined value. That is, the residue petroleum supply facility 2 may notify the residue petroleum utilization facility 3 of information on the amount of steam generated in the first boiler 9 and receive steam supply from the second boiler 7 to the residue petroleum supply facility 2 . From a different point of view, in the residual petroleum utilization facility 3, information on the amount of steam generated in the first boiler 9 is acquired, it is determined whether or not the amount of steam generated in the first boiler 9 has become equal to or less than a predetermined value, and the first boiler When the amount of steam generated in 9 becomes equal to or less than a predetermined value, the amount of steam generated in second boiler 7 may be increased to supply steam to residue petroleum supply facility 2 through steam return line 18 .

Moreover, the management device 6 may be provided in facilities other than the residue petroleum supply facility 2 and the residue petroleum utilization facility 3 . In this case, the management device 6 may be provided in the residue petroleum supply facility 2 or the residue petroleum utilization facility 3, or may be provided in a facility other than these facilities 2 and 3. In this case, the management device 6 acquires steam supply and demand information in the residual petroleum supply facility 2 and/or steam generation amount information in the first boiler 9, and determines the necessity of steam. Furthermore, when it is determined that steam is required in the residue petroleum supply facility 2, the management device 6 notifies the second boiler 7 (the second control device 12 thereof) of the residue petroleum utilization facility 3 to request steam. (e.g., sending a steam request signal) causes the steam of the second boiler 7 to be supplied to the first boiler 9 . In this way, the exchange between the residue petroleum supply facility 2 and the residue petroleum utilization facility 3 may be performed via another facility (or device).

Also, the management device 6 and/or the first control device 11 provided in the residue petroleum supply facility 2 may be configured as equipment of the residue petroleum utilization facility 3 .

Further, in the above-described embodiment, when the second control device 12 receives the steam request signal Sd, a mode of controlling to increase the amount of steam generated in the second boiler 7 has been described. When the amount of steam in the residue petroleum supply facility 2 is insufficient, the operator of the residue petroleum utilization facility 3 operates the second boiler 7 so as to increase the amount of steam generated in the second boiler 7. At the same time, an operation of supplying the steam generated in the second boiler 7 to the residue petroleum supply facility 2 through the steam return line 18 (opening operation of the on-off valve 20) may be performed.

In this case, instead of the steam request signal Sd, the residue petroleum supply facility 2 may transmit the request for steam supply to the residue petroleum utilization facility 3 by telephone or the like.

INDUSTRIAL APPLICABILITY The present invention is useful for stably supplying residue petroleum to facilities using residue petroleum.

1, 1B petroleum residue-fired boiler system (boiler system)
2 Oil residue supply facility 3 Oil residue utilization facility 31, 32 Steam generation facility 6 Control device 7 Second boiler 9 First boiler 11 First control device 12 Second control device 18 Steam return line (steam supply line)

Claims (5)

a first boiler provided in a petroleum residue supply facility having a cracker for producing petroleum residue and generating steam necessary for producing petroleum residue in the cracker ;
a second boiler, which is provided in a residual oil utilization facility separated from the residual oil supply facility and uses the residual oil transported from the residual oil supply facility as fuel;
a steam supply line for supplying steam generated in the second boiler to the cracking unit of the residual petroleum supply facility;
a management device that acquires steam supply and demand information in the residual petroleum supply facility;
a second boiler control device for controlling the second boiler;
A power generation device that generates power using the steam generated in the second boiler ,
The management device sends a steam request signal to the second boiler when a difference obtained by subtracting a demanded amount of steam in the residue petroleum supply facility from a supply amount of steam in the residue petroleum supply facility becomes equal to or less than a predetermined value. and send
When the second boiler receives the steam request signal, it operates so as to allow steam to be supplied to the residual petroleum supply facility,
The control device for the second boiler controls the amount of steam supplied from the second boiler to the power generator so that a predetermined amount of the steam generated by the second boiler is supplied to the power generator. and controlling to reduce the amount of steam supplied from the second boiler to the power generator when the steam request signal is received. A first boiler control device for controlling the first boiler ,
The control device for the first boiler transmits a steam request signal to the second boiler when the amount of steam generated in the first boiler is equal to or less than a predetermined value,
2. The boiler system according to claim 1, wherein said second boiler operates to enable supply of steam to said residue petroleum supply facility when said steam request signal is received. 2. The control device for the second boiler , when receiving the steam request signal, controls to increase the amount of steam generated in the second boiler compared to before receiving the steam request signal, or 2. The boiler system according to 2 . When the steam request signal is not received, the control device for the second boiler sets the first steam generation amount that is less than the maximum amount of steam that the second boiler can generate to the steam generation amount in the second boiler. 4 . The boiler system according to claim 3 , wherein when the steam request signal is received, a second steam generation amount larger than the first steam generation amount is set as the steam generation amount in the second boiler. The control device for the second boiler,
controlling to increase the amount of steam generated in the second boiler when the steam request signal is received compared to before the steam request signal is received;
When it becomes necessary to supply steam to the residual petroleum supply facility while increasing the amount of steam generated in the second boiler, the amount of steam supplied from the second boiler to the power generation device is increased. 5. The boiler system according to any one of claims 1 to 4 , controlled to reduce.

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