JP2014199004A - Steam processing equipment and steam processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an energy-saving effect of steam processing equipment.SOLUTION: Steam processing equipment 100 comprises: an intermediate pressure steam header SMH for housing intermediate-pressure steam; a low pressure steam header SLH for housing low-pressure steam; plural process units 10 connected to the intermediate pressure steam header SMH and the low pressure steam header SLH; and a low pressure steam compression part 30 for increasing pressure of the low-pressure steam supplied from the low pressure steam header SLH into the intermediate-pressure steam and supplying it to the intermediate pressure steam header SMH. The low-pressure steam generated in each process unit 10 is recovered by the low pressure steam header SLH. The pressure of the low-pressure steam recovered by the low pressure steam header SLH is increased into the intermediate-pressure steam by the low-pressure steam compression part 30, and then, supplied to each process unit 10 via the intermediate pressure steam header SMH.

Description

  The present invention relates to a steam processing facility and a steam processing method for processing steam in a plant.

  Conventionally, in a plant such as an oil plant, steam generated by a boiler is high-pressure steam (for example, 4.0 to 12.0 MPaG), medium-pressure steam (for example, 1.0 to 2.0 MPaG), and low-pressure steam (for example, 0.8. There are known steam processing equipment that supplies the steam to a steam using device such as a steam turbine and various production processes (for example, see Patent Document 1).

JP 2008-202432 A

  In such a steam processing facility, a large amount of low-pressure steam is generated from a steam using device such as a steam turbine. In conventional steam processing facilities, such low-pressure steam is mostly recovered and used for low-pressure steam power generation or existing low-pressure steam use processes. However, the amount of low-pressure steam generated in the steam treatment facility often greatly exceeds the demand for the existing low-pressure steam use process, and it cannot be said that the recovered low-pressure steam is sufficiently utilized. In addition, condensate turbine power generation using low-pressure steam has a high equipment cost, so the economic efficiency may be considerably reduced. In this way, in conventional steam processing facilities, low-pressure steam is limited in terms of demand and use effects, so it is not fully utilized even though there is room for recovery, and there is room for improvement from the viewpoint of energy saving. is there.

  This invention is made | formed in view of such a condition, The objective is to provide the steam processing equipment and the steam processing method which can improve an energy saving effect.

  In order to solve the above-described problems, a steam processing facility according to an aspect of the present invention includes an intermediate pressure steam header that stores intermediate pressure steam, a low pressure steam header that stores low pressure steam, an intermediate pressure steam header, and a low pressure steam header. A plurality of connected process units, and a low-pressure steam compression unit that pressurizes low-pressure steam supplied from the low-pressure steam header to obtain medium-pressure steam and supplies the medium-pressure steam header to the medium-pressure steam header. The low pressure steam generated in each process unit is collected in the low pressure steam header. The low-pressure steam collected in the low-pressure steam header is boosted to an intermediate-pressure steam by the low-pressure steam compressor, and then supplied to each process unit via the intermediate-pressure steam header.

  The low-pressure steam compression unit includes a compressor that compresses low-pressure steam from the low-pressure steam header, a steam turbine that starts the compressor using low-pressure steam from the low-pressure steam header, and after the compressor is started by the steam turbine, An electric motor that always operates the compressor instead of the steam turbine may be included.

  The low-pressure steam compression unit may include a compressor that compresses low-pressure steam from the low-pressure steam header, and a steam turbine that drives the compressor using the low-pressure steam from the low-pressure steam header.

  The low-pressure steam compression unit includes a compressor that compresses low-pressure steam from the low-pressure steam header, and a mixed gas turbine that drives the compressor using low-pressure steam from the low-pressure steam header and medium-pressure steam from the medium-pressure steam header. May be included.

  The low-pressure steam compression unit includes a compressor that compresses low-pressure steam from the low-pressure steam header, and an air-mixing turbine that drives the compressor using low-pressure steam from the low-pressure steam header and medium-pressure steam from the medium-pressure steam header; When surplus power exceeding the power required for driving the compressor is generated in the mixed gas turbine, a motor generator that performs induction power generation using the surplus power may be included.

  In the case where surplus power is not generated in the mixed gas turbine, the compressor may be driven using power obtained by combining the power from the mixed gas turbine and the power from the motor generator.

  The low-pressure steam compressor includes a compressor that compresses low-pressure steam from the low-pressure steam header, and a low-pressure steam and medium-pressure steam header from the steam turbine or low-pressure steam header that drives the compressor using the low-pressure steam from the low-pressure steam header. And an air-mixing turbine that drives the compressor using medium-pressure steam from the engine. The compressor may be evacuated during startup using the vacuum generated in the steam turbine or the mixed gas turbine.

  Each process unit may include a heat exchanger that heats and evaporates water using the process fluid to generate low pressure steam.

  You may further provide the cooling water collection | recovery means which collect | recovers the cooling water used by each process unit, and the heat pump which raises the temperature of the collect | recovered cooling water and generates a low pressure steam.

  Another aspect of the present invention is also a steam treatment facility. The steam processing facility includes an intermediate pressure steam header that accommodates medium pressure steam, a low pressure steam header that accommodates low pressure steam, and a quasi intermediate pressure steam header that accommodates quasi intermediate pressure steam between the intermediate pressure steam and the low pressure steam. , A plurality of process units to which the medium pressure steam header, low pressure steam header and semi-medium pressure steam header are connected, and the low-pressure steam supplied from the low-pressure steam header is boosted to produce semi-medium pressure steam. And a low-pressure vapor compression unit to be supplied. The low pressure steam generated in each process unit is collected in the low pressure steam header. The low-pressure steam collected in the low-pressure steam header is boosted to quasi-medium pressure steam by the low-pressure steam compressor, and then supplied to each process unit via the quasi-medium pressure steam header.

  Yet another aspect of the present invention is also a steam treatment facility. This steam treatment facility includes a medium pressure steam header that accommodates medium pressure steam, a low pressure steam header that accommodates low pressure steam, a semi-low pressure steam header that accommodates sub-low pressure steam lower than low pressure steam, an intermediate pressure steam header, A plurality of process units connected to the low-pressure steam header and the semi-low-pressure steam header; and a low-pressure steam compression section that pressurizes the semi-low-pressure steam supplied from the semi-low-pressure steam header to produce medium-pressure steam and supplies the medium-pressure steam header Is provided. Semi-low pressure steam generated in each process unit is collected in a semi-low pressure steam header. The semi-low pressure steam collected in the semi-low pressure steam header is boosted to an intermediate pressure steam by the low pressure steam compression unit, and then supplied to each process unit via the intermediate pressure steam header.

  Yet another embodiment of the present invention is a steam treatment method. The method includes the steps of recovering low-pressure steam from a plurality of process units, increasing the recovered low-pressure steam to intermediate pressure steam, and supplying the increased intermediate pressure steam to each process unit. Prepare.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the steam processing equipment and steam processing method which can improve an energy saving effect can be provided.

It is a figure for demonstrating the steam processing equipment which concerns on embodiment of this invention. It is a figure for demonstrating the steam processing equipment which concerns on another embodiment of this invention. It is a figure for demonstrating the steam processing equipment which concerns on another embodiment of this invention. It is a figure for demonstrating the modification of a low pressure steam compression part. It is a figure for demonstrating another modification of a low pressure steam compression part. It is a figure for demonstrating another modification of a low pressure steam compression part. It is a figure for demonstrating another modification of a low pressure steam compression part. It is a figure for demonstrating another modification of a low pressure steam compression part. It is a figure which shows the steam processing equipment which concerns on 1st Example of this invention. It is a figure which shows the steam processing equipment which concerns on 2nd Example of this invention. It is a figure which shows the steam processing equipment which concerns on 3rd Example of this invention. It is a figure which shows the steam processing equipment which concerns on 4th Example of this invention. It is a figure which shows the merit of the steam processing equipment which concerns on a 1st-3rd Example.

  FIG. 1 is a diagram for explaining a steam processing facility 100 according to an embodiment of the present invention. The steam processing facility 100 shown in FIG. 1 may be a steam processing facility used in, for example, an oil refinery plant, a petrochemical plant, a thermal power plant, or the like.

  As shown in FIG. 1, the steam processing facility 100 includes a plurality of process units 10 (first to n-th process units 10_1 to 10_n), a boiler 11, a high-pressure steam header SHH, an intermediate-pressure steam header SMH, and a low-pressure A steam header SLH and a low-pressure steam compressor 30 are provided.

  Each of the first to n-th process units 10_1 to 10_n includes process equipment (for example, a heat exchanger, a reactor, a heater, a pump, and a compressor) for performing a predetermined production process. For example, if the steam processing facility 100 is an oil plant, for example, the first process unit 10_1 includes a process facility for generating gasoline from petroleum, and a second process unit (not shown) for generating naphtha from gasoline, for example. For example, the n-th process unit 10_n includes a process facility for generating kerosene from petroleum.

  Each process unit 10 includes an air-cooled heat exchanger (air fin cooler) AFC and a kettle heat exchanger 38. The air-cooled heat exchanger AFC cools and liquefies the process fluid generated in the chemical production process. However, in the air-cooled heat exchanger AFC, heat energy is released without being recovered. Therefore, in the present embodiment, at least a part of the process fluid is bypassed before the air-cooled heat exchanger AFC and supplied to the kettle heat exchanger 38. Cooling water (BFW: Boiler Feed Water) is supplied to the kettle heat exchanger 38. The kettle type heat exchanger 38 heats and evaporates this BFW by heat exchange with the process fluid, and generates low pressure steam of 0.15 MPaG and 128 ° C.

  Each process unit 10 is connected to a high-pressure steam header SHH, an intermediate-pressure steam header SMH, and a low-pressure steam header SLH. The high-pressure steam header SHH is a header that accommodates high-pressure steam based on, for example, about 4.4 MPaG and about 394 ° C. Further, the medium pressure steam header SMH is a header that stores medium pressure steam based on about 1.37 MPaG and about 240 ° C., for example. Further, the low-pressure steam header SLH is a header that stores low-pressure steam based on, for example, about 0.15 MPaG and about 128 ° C. The high-pressure steam header SHH, the medium-pressure steam header SMH, and the low-pressure steam header SLH are common to the first to n-th process units 10_1 to 10_n.

  A first pressure control valve 13 is provided between the high pressure steam header SHH and the intermediate pressure steam header SMH. By controlling the first pressure control valve 13, the pressures of the high-pressure steam header SHH and the intermediate-pressure steam header SMH can be controlled to predetermined values.

  A second pressure control valve 15 is provided between the intermediate pressure steam header SMH and the low pressure steam header SLH. By controlling the second pressure control valve 15, the pressures of the intermediate pressure steam header SMH and the low pressure steam header SLH can be controlled to predetermined values.

  The boiler 11 generates high pressure steam (for example, about 4.4 MPaG, about 394 ° C.) using, for example, C heavy oil, off gas, and the like, and supplies the high pressure steam to the high pressure steam header SHH. The boiler 11 may be an FCC CO boiler, for example.

  The high-pressure steam supplied from the boiler 11 is sent to each process unit 10 via the high-pressure steam header SHH. The high pressure steam is supplied from the high pressure steam header SHH to the high pressure steam using device 17 of each process unit 10. The high-pressure steam using device 17 performs work using the high-pressure steam, and discharges the steam whose pressure has decreased (medium-pressure steam) to the medium-pressure steam header SMH.

  Further, the medium pressure steam is supplied from the medium pressure steam header SMH to the medium pressure steam using device 19 of each process unit 10. The medium pressure steam using device 19 performs work using the medium pressure steam, and discharges the steam whose pressure has decreased (low pressure steam) to the low pressure steam header SLH.

  In the present embodiment, the low-pressure steam generated in the kettle heat exchanger 38 of each process unit 10 is supplied to the low-pressure steam header SLH in addition to the low-pressure steam discharged from the medium-pressure steam using device of each process unit 10. Is done.

  The low pressure steam is supplied from the low pressure steam header SLH to the low pressure steam using device 21 of each process unit 10. The low-pressure steam using device 21 performs work using low-pressure steam. The high-pressure steam using device 17, the medium-pressure steam using device 19, and the low-pressure steam using device 21 may be a turbine, a pump, a heat exchanger, or the like.

  In the conventional steam processing facility, the low-pressure steam is used in the low-pressure steam using device 21 of each process unit 10 as described above, or a condensing turbine generator is connected to the low-pressure steam header SLH, and the condensing turbine generator is used. In general, low-pressure steam power generation is performed. However, the amount of low-pressure steam generated in the steam treatment facility often greatly exceeds the demand of the existing low-pressure steam use device 21, and a lot of excess low-pressure steam is generated. Supplying surplus low-pressure steam to the condensate turbine generator and generating low-pressure steam can increase the efficiency of using low-pressure steam. However, since condensate turbine generators are expensive, Economic efficiency decreases. Therefore, in the conventional steam processing equipment, there are many cases where low-pressure steam that has not been used up by the low-pressure steam using device 21 of each process unit 10 is released into the atmosphere, and there is room for improvement from the viewpoint of energy saving.

  Therefore, the steam processing facility 100 according to the present embodiment includes the low-pressure steam compression unit 30 between the intermediate-pressure steam header SMH and the low-pressure steam header SLH. In the present embodiment, the low-pressure steam compression unit 30 includes a compressor 24 that compresses the low-pressure steam from the low-pressure steam header SLH, and an electric motor (motor) 26 that starts and constantly operates the compressor 24. ing.

  The low-pressure steam compression unit 30 boosts the low-pressure steam supplied from the low-pressure steam header SLH to medium-pressure steam of about 1 to 1.5 MPaG (for example, 1.37 MPaG), and supplies the medium-pressure steam header SMH. The increased intermediate pressure steam is sent to each process unit 10 via the intermediate pressure steam header SMH, and is used in the intermediate pressure steam use device 19 of each process unit 10.

  By increasing the pressure of the recovered low-pressure steam to medium pressure steam as in the present embodiment, the added value of the low-pressure steam that has conventionally been surplus and released to the atmosphere is increased, and the usage destination can be expanded. The energy required for boosting the low-pressure steam to the medium-pressure steam (that is, the energy for driving the electric motor 26) is significantly less than the energy necessary for generating the medium-pressure steam using the boiler. Therefore, according to the steam treatment facility 100 according to the present embodiment, at least a part of the medium pressure steam that has been generated by using a conventional boiler is converted into low pressure steam that is generated by heating and evaporating water using a process fluid. By substituting with medium-pressure steam obtained by increasing the pressure, the energy saving effect can be improved.

  Considering the case of using steam for power generation, when low-pressure steam is supplied to a condensate turbine generator as it is for low-pressure steam power generation, the thermal efficiency is as low as about 12%. In addition, condensate turbine generators that support low-pressure steam are currently manufactured by a small number of manufacturers and are not easily procured. On the other hand, when power generation is performed using a low-pressure mixed gas condensate turbine generator that uses medium-pressure steam as the main steam, the thermal efficiency is 15% or more. In addition, many low-pressure mixed-air condensate turbine generators are manufactured and are easy to procure. Therefore, as in the present embodiment, by recovering the recovered low-pressure steam to medium-pressure steam, a low-pressure mixed gas condensate turbine generator with high thermal efficiency and easy procurement can be used effectively. It becomes like this.

  In the steam processing facility 100 according to the present embodiment, low-pressure steam is recovered from the first to n-th process units 10_1 to 10_n. The recovered low-pressure steam includes excess low-pressure steam that has not been used in the low-pressure steam use device 21 of each process unit 10 and low-pressure steam generated in the kettle heat exchanger 38 of each process unit 10. The recovered low-pressure steam is sent to the low-pressure steam compression unit 30 via the low-pressure steam header SLH, and the pressure is increased to medium pressure steam. Then, the pressurized intermediate pressure steam is sent to each process unit 10 via the intermediate pressure steam header SMH, and used by the intermediate pressure steam using device 19.

  For example, when the low pressure steam is boosted to medium pressure steam for each process unit 10, for example, the first process unit 10_1 has high use efficiency of low pressure steam, but the nth process unit 10_n has low use efficiency of low pressure steam. There is a possibility that a difference in utilization efficiency of the low-pressure steam is caused for each process unit 10 such as low. Therefore, in this case, there is a possibility that a sufficient energy saving effect of the steam treatment facility cannot be achieved.

  On the other hand, in the case of the process unit 10 according to the present embodiment, the low-pressure steam recovered from each process unit 10 is collectively boosted to medium-pressure steam by the low-pressure steam compression unit 30, and the boosted medium-pressure steam is supplied to each process unit 10. Since it is sent and used, a situation in which the use efficiency of low-pressure steam is different for each process unit 10 is avoided, and a sufficient energy saving effect can be achieved as the entire steam processing facility 100. Thus, since the low-pressure steam recovered from the plurality of process units 10_1 to 10_n can be pressurized and used for a plurality of medium-pressure steam use apparatuses 19 provided in different process units, the recovered low-pressure steam is The present invention can be used not only for the medium pressure steam using device 19 provided in a specific process unit but also for the medium pressure steam using device 19 provided in another process unit. As a result, the low-pressure steam that has been used for a limited time and has not been used much can be effectively used as energy, and energy saving can be achieved. Moreover, it becomes possible to make the medium pressure steam using apparatus 19 work without using the purchased steam or the steam generated by the boiler, and the work by the medium pressure steam using apparatus 19 can be performed economically.

  FIG. 2 is a view for explaining a steam processing facility according to another embodiment of the present invention. When the reference pressure (for example, 1.37 MPaG) of the existing medium pressure steam header SMH is higher than the pressure (for example, 1.05 MPaG or 0.75 MPaG) that can be increased by the low pressure steam compression unit 30, as shown in FIG. A semi-intermediate pressure steam header SubSMH that accommodates steam (referred to as "semi-medium pressure steam") having a pressure (for example, 1.05 MPaG or 0.75 MPaG) between the steam and the low-pressure steam is newly provided. This semi-intermediate pressure steam header SubSMH is connected to each process unit 10. Then, the lower limit pressure of the steam used in equipment such as the back pressure turbine 23 of each process unit that uses the intermediate pressure steam is checked. If the lower limit pressure is high, the sub intermediate pressure steam of the sub intermediate pressure steam header SubSMH is used. Modify the equipment to fit. The quasi-medium pressure steam boosted by the low-pressure steam compression unit 30 is supplied to each process unit via the quasi-medium pressure steam header SubSMH and used by the modified back pressure turbine 23 '.

  If the low pressure steam compression unit 30 compresses the low pressure steam and does not reach the medium pressure steam pressure of the existing plant as in the present embodiment, a semi-medium pressure steam dedicated header is installed and the existing back pressure is set. By modifying and applying the turbine 23, the amount of steam generated in the plant by the boiler 11 can be greatly reduced, and the energy saving effect can be improved.

  FIG. 3 is a view for explaining a steam processing facility according to still another embodiment of the present invention. The steam generated in the kettle heat exchanger 38 of each process unit 10 may not reach the reference pressure (for example, 0.15 MPaG) of the existing low-pressure steam header SLH (steam lower in pressure than such low-pressure steam ( For example, 0.1 MPaG) is referred to as “sub-low pressure steam”). In such a case, as shown in FIG. 3, a semi-low pressure steam header SubSLH that accommodates semi-low pressure steam is newly installed. Then, the semi-low pressure steam recovered from each process unit is boosted to medium pressure steam by the low pressure steam compressor 30 and supplied to the medium pressure steam header SMH.

  When the steam recovered from each process unit does not reach the low pressure steam pressure as in this embodiment, a semi-low pressure steam header SubSLH is installed, and the semi-low pressure steam is boosted to medium pressure steam and used in each process unit. By doing so, the steam generation amount of the plant by the boiler 11 can be significantly reduced, and the energy saving effect can be improved. Note that the low-pressure steam compression unit 30 may be used to raise the semi-low-pressure steam of the semi-low-pressure steam header SubSLH to quasi-medium-pressure steam and supply it to the quasi-medium-pressure steam header SubSMH.

  FIG. 4 is a diagram for explaining a modification of the low-pressure steam compression unit. In the low-pressure steam compression unit 30 shown in FIG. 1, the compressor 24 is activated and always operated by an electric motor 26. A low-pressure steam compressor 40 shown in FIG. 4 includes a compressor 24 that compresses low-pressure steam from the low-pressure steam header SLH, and a steam turbine 41 that starts and constantly operates the compressor 24 using the low-pressure steam from the low-pressure steam header SLH. It is comprised including. According to the low-pressure steam compression unit 40 according to this modification, an electric motor is not necessary, and further effective use of low-pressure steam can be achieved.

  FIG. 5 is a diagram for explaining another modified example of the low-pressure vapor compression unit. The low-pressure steam compressor 50 shown in FIG. 5 includes a compressor 24 that compresses low-pressure steam from the low-pressure steam header SLH, a steam turbine 41 that starts the compressor 24 using low-pressure steam from the low-pressure steam header SLH, After the compressor 24 is started by the turbine 41, an electric motor 42 that always operates the compressor 24 instead of the steam turbine 41 is configured.

  When trying to introduce a large motor for driving the compressor, it is usually necessary to reinforce existing power distribution facilities in the plant. This is because a large electrical load is applied to the power receiving and distribution facility when the compressor 24 is started. As in the modification shown in FIG. 5, the compressor 24 is accelerated to the rated rotational speed or more by the steam turbine 41 and then the motor 42 is turned on to instantly end a large starting current flowing through the motor 42. Can be made. Therefore, according to the modification shown in FIG. 5, the size of the electric motor 42 can be increased while minimizing the strengthening of the existing power distribution facility. In other words, drastic remodeling of the existing power distribution facility due to the introduction of the large motor 42 can be avoided.

  FIG. 6 is a diagram for explaining still another modified example of the low-pressure vapor compression unit. The low-pressure steam compression unit 60 shown in FIG. 6 compresses using the compressor 24 that compresses the low-pressure steam from the low-pressure steam header SLH, and the low-pressure steam from the low-pressure steam header SLH and the medium-pressure steam from the medium-pressure steam header SMH. And an air-mixing turbine 61 that starts and constantly operates the machine 24. According to the low-pressure steam compression unit 60 according to the present modification, an electric motor is not required, and the degree of freedom of steam distribution is dramatically improved even when the amount of low-pressure steam and medium-pressure steam collected through plant operation varies. The energy saving effect in the steam treatment facility 100 can be maximized.

  FIG. 7 is a view for explaining still another modified example of the low-pressure vapor compression unit. The low-pressure steam compressor 70 shown in FIG. 7 compresses using the compressor 24 that compresses the low-pressure steam from the low-pressure steam header SLH, and the low-pressure steam from the low-pressure steam header SLH and the medium-pressure steam from the medium-pressure steam header SMH. An air-mixing turbine 61 that drives the compressor 24, and a motor generator 62 that generates induction using the surplus power when surplus power exceeding the power required to drive the compressor 24 is generated in the air-mixing turbine 61. It consists of In the low-pressure steam compressor 70, when no surplus power is generated in the mixed gas turbine 61, the compressor 24 is driven using power that is a combination of the power from the mixed gas turbine 61 and the power from the motor generator 62. . According to the low-pressure steam compression unit 70 according to this modification, the motor generator 62 can function as an electric motor or a generator in accordance with fluctuations in the amount of low-pressure steam generated and demand fluctuations in medium-pressure steam. The energy saving effect in the facility 100 can be further improved.

  FIG. 8 is a view for explaining still another modified example of the low-pressure vapor compression unit. A low-pressure steam compression unit 80 shown in FIG. 8 is a modification of the low-pressure steam compression unit 50 shown in FIG. 5, and includes a compressor 24 that compresses low-pressure steam from the low-pressure steam header SLH and low-pressure steam from the low-pressure steam header SLH. A steam turbine 41 that drives the compressor 24 using steam and a condenser 43 connected to the steam turbine 41 are provided.

  In the low-pressure steam compression unit 80, a vacuum state is generated from the steam turbine 41 to the condenser 43 by driving the steam turbine 41 with low-pressure steam. In the low-pressure steam compression unit 80 according to this modification, the compressor 24 is brought into a vacuum state using the vacuum generated in the steam turbine 41 when the compressor 24 is started. Thereby, since the starting load of the compressor 24 is reduced, the output of the steam turbine 41 required for starting can be minimized, and the degree of freedom of the ratio of the low-pressure steam amount distributed to the compressor 24 and the steam turbine 41 can be increased. Can greatly improve.

  In the low-pressure steam compression unit 80 according to this modification, the mixed gas turbine 61 described with reference to FIG. 6 may be used instead of the steam turbine 41.

  Further, in addition to or instead of the vacuum generated in the steam turbine 41, the compressor 24 may be brought into a vacuum state using a vacuum generated by a vacuum generator 47 connected to the condenser 43. As the vacuum generator 47, a vacuum pump or a steam ejector can be used.

  Next, an embodiment of the steam processing facility will be described. FIG. 9 shows a steam treatment facility according to the first embodiment of the present invention. The steam processing facility 100 according to the first embodiment employs a low-pressure steam compression unit 30 that includes the compressor and the electric motor described in FIG.

  In the first example, 0.25 MPaG low pressure steam (referred to as “second low pressure steam”) slightly higher than the 0.15 MPaG low pressure steam (referred to as “first low pressure steam”) described in the above embodiment. ) Is set. In the first embodiment, 1.05 MPaG quasi-intermediate pressure steam that is slightly lower than 1.37 MPaG medium pressure steam is set. Therefore, the steam processing facility 100 according to the first embodiment accommodates the high-pressure steam header SHH that accommodates high-pressure steam, the medium-pressure steam header SMH that accommodates medium-pressure steam, and the semi-medium-pressure steam in descending order of the accommodated steam pressure. A sub-medium pressure steam header SubSMH, a second low-pressure steam header SLH2 that accommodates the second low-pressure steam, and a first low-pressure steam header SLH1 that accommodates the first low-pressure steam are provided. The first low-pressure steam header SLH1 corresponds to the low-pressure steam header SLH described in FIG.

  In the first embodiment, the first low-pressure steam is recovered 100 t / h by the kettle heat exchanger 38 of each process unit. The letdown from the intermediate pressure steam header SMH to the second low pressure steam header SLH2 is set to 0 t / h, and the letdown from the second low pressure steam header SLH2 to the first low pressure steam header SLH1 is set according to the header balance. Further, the first low-pressure steam 56 t / h is increased to 1.05 MPaG using the low-pressure steam compression unit 30 so that the purchased steam becomes 0 t / h. In addition, 33 of the 60 pumps driven by medium pressure steam have been modified to 1.05 MPaG specifications and connected to the sub-medium pressure steam header SubSMH. In the first embodiment, the low-pressure steam 38.8 t / h that could not be boosted by the low-pressure steam compressor 30 is supplied to the radial turbine condensate generator 45 and used for power generation.

  FIG. 10 shows a steam processing facility according to the second embodiment of the present invention. The steam processing facility 100 according to the second embodiment also employs the low-pressure steam compression unit 30 that includes the compressor and the electric motor described in FIG.

  In the second embodiment, the first low-pressure steam is recovered 61.2 t / h so that the purchased steam becomes 0 t / h. The letdown from the intermediate pressure steam header SMH to the second low pressure steam header SLH2 is set to 0 t / h, and the letdown from the second low pressure steam header SLH2 to the first low pressure steam header SLH1 is set according to the header balance. In the second embodiment, the first low-pressure steam 56 t / h is increased to 1.05 MPaG so that the purchased steam becomes 0 t / h. Also in the second embodiment, 33 of the 60 pumps driven by medium pressure steam are modified to 1.05 MPaG specifications and connected to the sub-medium pressure steam header SubSMH. In the second embodiment, the low-pressure steam compression unit 30 uses up the recovered low-pressure steam, and no excessive low-pressure steam is generated.

  FIG. 11 shows a steam processing facility according to the third embodiment of the present invention. The steam treatment facility 100 according to the third embodiment employs a low-pressure steam compressor 60 (mixed condensate turbine compressor) composed of the compressor and mixed gas turbine described in FIG.

  In the third embodiment, 100 t / h of the first low-pressure steam is recovered by the kettle heat exchanger 38 of each process unit. The letdown from the intermediate pressure steam header SMH to the second low pressure steam header SLH2 is set to 0 t / h, and the letdown from the second low pressure steam header SLH2 to the first low pressure steam header SLH1 is set according to the header balance. In the third embodiment, the first low-pressure steam 57 t / h is increased to 1.05 MPaG using the low-pressure steam compression unit 60 so that the purchased steam is minimized. In the third embodiment, the introduction amount of 1.05 MPaG quasi-medium pressure steam to the mixed gas turbine of the low-pressure steam compression unit 60 is set to ¼ of the introduction amount of the first low-pressure steam of 0.15 MPaG. In the third embodiment, 27 of the 60 pumps driven by medium pressure steam are modified to 1.05 MPaG specifications and connected to the sub-medium pressure steam header SubSMH. Also in the third embodiment, the low-pressure steam compression unit 30 uses up the recovered low-pressure steam, and no excessive low-pressure steam is generated.

  FIG. 12 shows a steam processing facility according to the fourth embodiment of the present invention. The steam processing facility 100 according to the fourth embodiment employs a low-pressure steam compression unit 70 configured by the compressor, the mixed gas turbine, and the motor generator 62 described in FIG.

  In the fourth embodiment, 130 t / h of the first low-pressure steam is recovered by the kettle heat exchanger 38 of each process unit. The letdown from the intermediate pressure steam header SMH to the second low pressure steam header SLH2 is set to 0 t / h, and the letdown from the second low pressure steam header SLH2 to the first low pressure steam header SLH1 is set according to the header balance. In the fourth embodiment, the first low-pressure steam 67 t / h is increased to 1.05 MPaG using the low-pressure steam compression unit 60 so that the purchased steam is minimized. Further, in the fourth embodiment, 27 pumps out of 60 pumps driven by medium pressure steam are remodeled to 1.05 MPaG specifications and connected to the sub-medium pressure steam header SubSMH. Also in the fourth embodiment, the low-pressure steam compression unit 30 uses up the recovered low-pressure steam, and no excessive low-pressure steam is generated.

  FIG. 13 shows the merit of the steam processing facility according to the first to third embodiments. The steam processing facility 100 according to the first to third embodiments has an economic effect that is three times or more compared to the steam processing facility that simply uses conventional low-pressure steam for turbine power generation. In this way, by substituting at least a part of the intermediate pressure steam that has been purchased in the past with the intermediate pressure steam obtained by increasing the pressure of the low pressure steam generated by heating and evaporating water using the process fluid. The plant can be operated economically.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .

  For example, in the above-described embodiment, the low pressure steam is generated from the cooling water using the kettle heat exchanger 38 in each process unit 10 and the low pressure steam is increased to the medium pressure steam. Instead of or in addition to this, the cooling water used in each process unit 10 is recovered, and the low-temperature steam is generated by raising the temperature of the recovered cooling water using a heat pump. It is good also as a structure which pressure | voltage-rises. Conventionally, the return cooling water after cooling has been simply used for re-cooling circulation by heat release in a cooling tower or the like, but by adopting the configuration as described above, heat release is greatly reduced, and the added value is high. Since it can be converted into steam, the energy saving effect of the steam treatment facility can be greatly improved.

  SLH1 1st low pressure steam header, SLH2 2nd low pressure steam header, SLH low pressure steam header, SMH medium pressure steam header, SHH high pressure steam header, 10 process unit, 11 boiler, 19 medium pressure steam using device, 21 low pressure steam using device, 24 Compressor, 26 Electric motor, 30, 40, 50, 60, 70, 80 Low pressure steam compression section, 38 Kettle type heat exchanger, 45 Radial turbine condensate generator, 61 Mixed air turbine, 62 Motor generator, 100 Steam Processing equipment.

Claims (12)

A medium pressure steam header for accommodating the medium pressure steam;
A low pressure steam header containing low pressure steam;
A plurality of process units to which the medium pressure steam header and the low pressure steam header are connected;
Pressurizing low-pressure steam supplied from the low-pressure steam header into intermediate-pressure steam, and supplying the intermediate-pressure steam header with a low-pressure steam compressor;
With
Low pressure steam generated in each process unit is collected in the low pressure steam header,
The low-pressure steam recovered in the low-pressure steam header is boosted to an intermediate-pressure steam by the low-pressure steam compression unit, and then supplied to each process unit via the intermediate-pressure steam header. .   The low-pressure steam compression unit includes a compressor that compresses low-pressure steam from the low-pressure steam header, a steam turbine that starts the compressor using low-pressure steam from the low-pressure steam header, and the compressor using the steam turbine. The steam processing equipment according to claim 1, further comprising: an electric motor that constantly operates the compressor instead of the steam turbine after the engine is started.   The low-pressure steam compression unit includes a compressor that compresses low-pressure steam from the low-pressure steam header, and a steam turbine that drives the compressor using low-pressure steam from the low-pressure steam header. The steam processing facility according to claim 1.   The low-pressure steam compression unit drives the compressor using a compressor that compresses low-pressure steam from the low-pressure steam header, low-pressure steam from the low-pressure steam header, and medium-pressure steam from the medium-pressure steam header. The steam processing facility according to claim 1, comprising an air-mixing turbine.   The low-pressure steam compression unit drives the compressor using a compressor that compresses low-pressure steam from the low-pressure steam header, low-pressure steam from the low-pressure steam header, and medium-pressure steam from the medium-pressure steam header. An air-fueled turbine, and a motor generator that generates induction using the surplus power when surplus power exceeding the power required for driving the compressor is generated in the air-fueled turbine. Item 2. A steam treatment facility according to item 1.   6. The compressor is driven using power obtained by combining power from the mixed gas turbine and power from the motor generator when surplus power is not generated in the mixed gas turbine. Steam treatment equipment described in 1. The low-pressure steam compression unit includes a compressor that compresses low-pressure steam from the low-pressure steam header, a steam turbine that drives the compressor using low-pressure steam from the low-pressure steam header, or low-pressure steam from the low-pressure steam header. And an air-mixing turbine that drives the compressor using medium-pressure steam from the medium-pressure steam header, and
The steam processing equipment according to claim 1, wherein the compressor is brought into a vacuum state at the time of start-up using a vacuum generated in the steam turbine or the mixed gas turbine.   The steam processing facility according to claim 1, wherein each process unit includes a heat exchanger that generates low-pressure steam by heating and evaporating water using a process fluid. Cooling water recovery means for recovering the cooling water used in each process unit;
A heat pump that raises the temperature of the recovered cooling water and generates low-pressure steam;
The steam processing facility according to claim 1, further comprising: A medium pressure steam header for accommodating the medium pressure steam;
A low pressure steam header containing low pressure steam;
A quasi-medium pressure steam header containing quasi-medium pressure steam between the medium pressure steam and the low pressure steam;
A plurality of process units to which the medium pressure steam header, the low pressure steam header and the semi-medium pressure steam header are connected;
The low pressure steam supplied from the low pressure steam header is boosted into a quasi-medium pressure steam, and the low pressure steam compression unit that supplies the quasi-medium pressure steam header;
With
Low pressure steam generated in each process unit is collected in the low pressure steam header,
The low-pressure steam recovered in the low-pressure steam header is boosted to quasi-medium pressure steam by the low-pressure steam compressor, and then supplied to each process unit via the quasi-medium pressure steam header. Processing equipment. A medium pressure steam header for accommodating the medium pressure steam;
A low pressure steam header containing low pressure steam;
A semi-low pressure steam header containing a sub-low pressure steam lower than the low pressure steam;
A plurality of process units to which the intermediate pressure steam header, the low pressure steam header and the semi-low pressure steam header are connected;
Pressurizing the semi-low pressure steam supplied from the semi-low pressure steam header to an intermediate pressure steam, and supplying the intermediate pressure steam header to the low pressure steam compressor;
With
The semi-low pressure steam generated in each process unit is collected in the semi-low pressure steam header,
The sub-low pressure steam collected in the sub-low pressure steam header is boosted to medium pressure steam by the low pressure steam compression unit and then supplied to each process unit via the intermediate pressure steam header. Processing equipment. Recovering low pressure steam from a plurality of process units;
Boosting the recovered low-pressure steam to medium-pressure steam;
Supplying the pressurized medium pressure steam to each process unit;
A steam treatment method comprising:

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