JP5359540B2 - Steam system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam system pressure rising and reusing exhaust steam from a steam drive source such as a steam turbine and a screw type steam engine. <P>SOLUTION: This system includes a first steam engine 50 generating power by using steam and a pressure rising mechanism 54 pressure rising exhaust steam from the first steam engine 50 by using steam. The pressure rising mechanism 54 is, for example, an ejector 55. The steam is supplied from a same storage water heater body of the steam supplied to the pressure rising mechanism for pressure rising the exhaust steam from the first steam engine. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a steam system that boosts and reuses exhaust steam from a steam drive source such as a steam turbine or a screw steam engine.

  Conventionally, a compressor, a generator, or the like is driven by a steam turbine, a screw-type steam engine, or the like. In this case, the steam exhausted from a steam turbine, a screw-type steam engine or the like has a low pressure and its use is limited.

  Conventionally, as disclosed in the following patent documents, it has been proposed to install a plurality of exhaust gas boilers so that the set vapor pressure becomes lower as the exhaust gas flow goes downstream. In this case, there was a demand for each steam having different steam pressures, and the versatility was poor.

JP 59-150203 A Japanese Patent Laid-Open No. 11-350921

  The problem to be solved by the present invention is to broaden the use of steam after use in a steam engine. Another object is to broaden the application of steam having different vapor pressures in combination with a multi-pressure exhaust gas boiler.

The present invention has been made to solve the above problems, and the invention according to claim 1 is directed to a first steam engine that generates power using steam and exhaust steam from the first steam engine. The steam supplied to the first steam engine and the steam supplied to the pressure raising mechanism for boosting the exhaust steam from the first steam engine are the same can. The booster mechanism is provided with an ejector, and the ejector sucks exhaust steam from the first steam engine by injecting steam different from the exhaust steam from the first steam engine into the nozzle. The steam to the nozzle and the exhaust steam from the first steam engine are mixed and discharged, the compressor or generator is driven by the first steam engine, and the pressure on the outlet side of the ejector is a set value. The In other words, steam supply from the boiler via the ejector is controlled by controlling the steam supply operation valve to the first steam engine or the suction valve to the suction port of the ejector and the steam supply valve to the nozzle of the ejector. Or a steam system that controls the boiler to limit the amount of evaporation by the boiler .

  According to the first aspect of the present invention, the use of the steam after being used in the first steam engine can be widened by boosting the exhaust steam from the first steam engine by the boost mechanism.

According to the invention described in claim 1, the can body supplying steam to the first steam engine is the same as the can body supplying steam to the pressure increasing mechanism in order to boost the exhaust steam from the first steam engine . Thereby, it is possible to drive the first steam engine and boost the exhaust steam from the first steam engine with a simple configuration.

According to the first aspect of the present invention, the exhaust steam from the first steam engine can be easily boosted by the ejector.

According to the invention described in claim 1, it is possible to drive the compressor or a generator by the first steam engine. Power can be saved by driving the compressor or generator using steam.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is the steam after use with a steam engine, a use can be broadened by raising pressure using a pressure | voltage rise mechanism. Moreover, the use of steam with different vapor pressures can be broadened by combining with a multi-pressure exhaust gas boiler.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows Example 1 of the steam system of this invention, and has shown it notched partially. FIG. 2 is a schematic plan view of an exhaust gas boiler used in the steam system of FIG. 1, with a part cut away. It is the schematic which shows Example 2 of the steam system of this invention. It is the schematic which shows Example 3 of the steam system of this invention. It is the schematic which shows an example of the water supply system to each can body in Example 1 and Example 2, and has shown only the can body and the economizer. It is the schematic which shows the other example of the water supply system to each can body in Example 1 and Example 2, and has shown only the can body and the economizer. It is the schematic which shows another example of the water supply system to each can in Example 1 and Example 2, and only the can and the economizer are shown.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing a first embodiment of a steam system 1 according to the present invention, which is partially cut away. FIG. 2 is a schematic plan view of the exhaust gas boiler 2 used in the steam system 1 and is partially cut away.

  The steam system 1 of this embodiment includes an exhaust gas boiler 2 that generates steam using exhaust heat, and the exhaust gas boiler 2 includes a plurality of cans 3 to 5. In the present embodiment, the three can bodies of the first can body 3, the second can body 4 and the third can body 5 are installed in series along the exhaust gas flow. Therefore, the first can body 3 can also be called an upstream can body, the second can body 4 can be called a midstream can body, and the third can body 5 can be called a downstream can body.

  Each of the cans 3 to 5 can be configured in the same manner as various conventionally known exhaust gas boilers, regardless of the configuration, but in the illustrated example, it is a multi-pipe once-through boiler. Specifically, each of the cans 3 to 5 is configured by connecting the upper headers 6 to 8 and the lower headers 9 to 11 with a large number of water tubes 12 to 14. The upper headers 6 to 8 and the lower headers 9 to 11 are spaced apart in parallel in the vertical direction, and the inside is formed to be hollow. On the other hand, each water pipe 12-14 is arrange | positioned perpendicularly | vertically, and while an upper end part is connected to the upper headers 6-8, a lower end part is connected to the lower headers 9-11. Although not shown, the connection parts between the upper and lower headers 6 to 11 and the water pipes 12 to 14 are covered with a fireproof material.

  Although arrangement | positioning of the water pipes 12-14 in each can 3-5 is set suitably, while being arrange | positioned perpendicularly | vertically with the flow direction of waste gas, it is arrange | positioned also with multiple flow direction of waste gas. At that time, a gap through which the exhaust gas is passed is opened between the adjacent water pipes, and the water pipes are arranged in a staggered manner in the illustrated example. In addition, the water pipes 12 to 14 may be provided with fins, studs, or the like on the outer peripheral surface as desired to increase the heat transfer area.

  Each can body 3 to 5 is covered with a can body cover 15 except for the entrance and exit of the exhaust gas so that the exhaust gas flows in order to the first can body 3, the second can body 4 and the third can body 5. At this time, each of the can bodies 3 to 5 may be covered with a common can body cover 15, or the can bodies 3 to 5 may be covered with the can body cover 15 except for the inlet / outlet of the exhaust gas, and connected to each other by a flange or a pipe. May be. That is, while connecting the exhaust gas outlet of the can body cover of the first can body 3 and the exhaust gas inlet of the can body cover of the second can body 4, the exhaust gas outlet of the can body cover of the second can body 4 and the third can body The exhaust gas inlet of the can body cover 5 may be connected. In this case, a plurality of independently configured exhaust gas boilers 2 are connected in series. In any case, it goes without saying that the can body cover 15 may be provided with a heat insulating material or a refractory material.

  Water (usually soft water) is supplied to the lower headers 9 to 11 through the water supply channels 16 to 18 to the cans 3 to 5, and the water is heated by the exhaust gas in the water tubes 12 to 14 and is vaporized. Is done. The steam is led out from the upper headers 6 to 8 through the steam separators 19 to 21. Moreover, the water in each can 3-5 can be discharged | emitted from the lower headers 9-11 via the drainage channels 22-24 if desired. By opening the drainage valves 25 to 27 provided in the drainage channels 22 to 24, drainage can be achieved from the cans 3 to 5.

  The steam / water separators 19 to 21 are centrifugal steam / water separators in this embodiment. Specifically, the steam separators 19 to 21 are provided with longitudinally cylindrical cylinders 28 to 30, and steam is introduced into the cylinders 28 to 30 in a tangential direction. Accordingly, the steam from the upper headers 6 to 8 swirls within the barrels 28 to 30, and the centrifugal force causes the water to be blown outward and to drop downward, thus improving the dryness. Steam is led out from the top of the barrels 28-30. In addition, the water separated in the trunks 28 to 30 is returned to the lower headers 9 to 11 through the separated water return pipes 31 to 33.

  In this embodiment, water supply to the lower headers 9 to 11 of the cans 3 to 5 is preheated by the economizers 34 to 36. Specifically, economizers 34 to 36 are installed downstream of the exhaust gas boiler 2. In the illustrated example, the first can body 3, the second can body 4, the third can body 5, and the economizers 34 to 36 are covered with a common can body cover 15, but separately from the exhaust gas boiler 2, the economizer 34 to 36 and the exhaust gas outlet of the exhaust gas boiler 2 and the exhaust gas inlet of the economizer 34 may be connected by a flange or piping.

  In the present embodiment, the economizers 34 to 36 are installed in the number of the cans 3 to 5 and are installed in series along the exhaust gas flow. In this case, it is preferable that the economizers 34 to 36 preheat the water supplied to the can installed at the upstream side of the exhaust gas stream as the economizers 34 to 36 are installed at the upstream side of the exhaust gas stream.

  Specifically, the first economizer 34, the second economizer 35, and the third economizer 36 are installed in order along the exhaust gas flow. 35 preheats the water supply to the second can body 4, and the third economizer 36 preheats the water supply to the third can body 5. And the water pre-heated by each economizer 34-36 is supplied to the lower headers 9-11 of each can 3-5. The presence or absence of water supply to each of the cans 3 to 5 controls the operation of the water supply pumps 37 to 39 to the economizers 34 to 36 based on the detection result of the water level detector (not shown) of each of the cans 3 to 5. Can be switched.

  In the exhaust gas boiler 2 and the economizers 34 to 36, exhaust gas is introduced through the exhaust gas introduction path 40, and exhaust gas is led out through the exhaust gas outlet path 41. While the exhaust gas passes through the exhaust gas boiler 2, heat exchange between the exhaust gas and the water pipes 12 to 14 is performed, and the exhaust gas is cooled while the water in the water pipes 12 to 14 is heated and vaporized. Further, while the exhaust gas passes through the economizers 34 to 36, the water supplied to the cans 3 to 5 is preheated by the exhaust gas.

  The exhaust gas introduction path 40 and the exhaust gas outlet path 41 are connected by a bypass path 42. Then, it is possible to selectively switch whether the exhaust gas is discharged via the exhaust gas boiler 2 and the economizers 34 to 36 or the exhaust gas via the bypass passage 42, or the distribution ratio of both can be adjusted. Thereby, the evaporation amount by the exhaust gas boiler 2 can be adjusted. Therefore, in this embodiment, a three-way damper 43 is provided at a branch portion between the exhaust gas introduction path 40 and the bypass path 42. However, a damper may be separately provided in each of the exhaust gas introduction path 40 and the bypass path 42 downstream of the branch portion between the exhaust gas introduction path 40 and the bypass path 42, and the opening / closing or opening degree of each damper may be adjusted.

  The three-way damper 43 includes a box-shaped valve box 44, and the valve box 44 is provided with one exhaust gas inlet 45 and two exhaust gas outlets 46 and 47. Of the two exhaust gas outlets 46 and 47, one (46) is connected to the exhaust gas introduction path 40 to the exhaust gas boiler 2 and the other (47) is connected to the bypass path 42. In addition, a damper 48 is provided in the valve box 44, and the supply flow rate to the exhaust gas boiler 2 and the supply to the bypass passage 42 with respect to the exhaust gas from the exhaust gas inlet 45 by adjusting the position of the damper 48. The distribution ratio with the flow rate can be adjusted. Specifically, the distribution ratio is adjusted by controlling the motor 49 that drives the damper 48 and adjusting the rotation stop position of the damper 48. However, as described above, the damper 48 may be controlled to selectively open one of the two exhaust gas outlets 46 and 47 and close the rest as desired.

The first can body 3, the second can body 4 and the third can body 5 are appropriately designed for their vapor pressure and evaporation amount, but in order to improve the amount of heat recovered from the exhaust gas, It is preferable to design the vapor pressure to be the same or lower as it goes. For example, the first can body 3 and the second can body 4 are 8 kgf / cm ² (= 0.78 MPa), and the third can body 5 is 5 kgf / cm ² (= 0.49 MPa).

  In the present embodiment, the first steam engine 50 is driven using the steam from the first can body 3. Specifically, the steam system 1 includes a first steam engine 50 that generates power using steam, and a compressor 51 that is driven by the first steam engine 50. However, the device driven by the first steam engine 50 is not limited to the compressor 51 and may be a generator, for example.

  The first steam engine 50 is a screw steam engine in the present embodiment. A screw-type steam engine is an apparatus in which steam is introduced between screw rotors that mesh with each other, and the steam is expanded and decompressed while rotating the screw rotor by the steam, and power is obtained by rotation of the screw rotor at that time. However, the first steam engine 50 is not limited to the screw steam engine as long as it generates power using steam. For example, a steam turbine or a reciprocating steam engine using reciprocating piston movement may be used.

  The type of the compressor 51 driven by the first steam engine 50 is not particularly limited. For example, a screw type air compressor or a steam compressor is used. A screw-type compressor is a device that sucks steam between screw rotors that rotate while meshing with each other, and compresses and discharges the steam by rotation of the screw rotor. However, the compressor 51 is not limited to the screw type but may be a reciprocating type.

  The steam from the first can 3 is supplied to the steam engine 50 through the first steam path 52. By adjusting the opening / closing or opening degree of the steam supply operation valve 53 provided in the first steam path 52, the presence / absence of the operation of the first steam engine 50 or the output can be adjusted.

The steam supplied to the first steam engine 50 is decompressed and expanded by working in the first steam engine 50. Since such low-pressure steam (for example, 3 kgf / cm ² (= 0.29 MPa)) has a limited use, the steam system 1 of the present embodiment is boosted by the boost mechanism 54. As a result, the exhaust steam from the first steam engine 50 can be boosted and reused.

  Specifically, the booster mechanism 54 of this embodiment includes an ejector 55. The ejector 55 includes a nozzle and a diffuser, and by ejecting a high-pressure fluid from the nozzle toward the diffuser, the ejector 55 sucks the low-pressure fluid from the suction port, and mixes and discharges both fluids. Here, the second steam path 56 through which the steam from the second can body 4 passes is connected to the nozzle, and the exhaust steam path 57 through which the exhaust steam from the first steam engine 50 passes is connected to the suction port. Yes.

Accordingly, the steam from the second can body 4 is blown into the nozzle, so that the exhaust steam from the first steam engine 50 is sucked into the ejector 55. Both steams are mixed and discharged. During this time, the steam from the second can body 4 is depressurized, while the exhaust steam from the first steam engine 50 is pressurized. Here, the pressure of the mixed steam is set to 5 kgf / cm ² (= 0.49 MPa). Accordingly, the steam from the third can body 5 can be joined to the steam from the ejector 55 via the third steam path 58.

  If desired, a steam supply valve 59 is provided in the second steam path 56. Although not shown, the exhaust steam passage 57 may be provided with a valve (hereinafter referred to as a suction valve) if desired. These valves can be opened and closed or changed in opening degree.

  The steam from the ejector 55 is led to the fourth steam path 60. The steam in the fourth steam path 60 can be supplied to various steam using facilities via a steam header 61 as desired. The steam header 61 can be supplied with steam from a boiler (fuel-fired boiler or electric boiler) 62 as desired. A pressure adjustment valve 63 is provided in the fourth steam path 60.

  The pressure adjustment of the first can body 3 and the second can body 4 is performed by adjusting the position of the damper 48 of the three-way damper 43 to adjust the exhaust gas flow rate supplied to the exhaust gas boiler 2. Specifically, the pressure in the first can body 3 (which may be a temperature in some cases) is monitored by the first sensor 64, and the motor 49 is controlled so as to maintain the vapor pressure from the first can body 3 as desired. The position of the damper 48 is adjusted by controlling.

  The pressure adjustment of the third can body 5 is performed by the pressure adjustment valve 63. That is, the pressure adjustment valve 63 provided in the fourth steam path 60 adjusts the opening degree so as to maintain the pressure on the primary side (upstream side) as desired. In the present embodiment, the pressure adjustment valve 63 is configured to adjust the opening degree by itself, but the opening degree may be adjusted based on the pressure detected by the second sensor 65 provided in front of the pressure adjustment valve 63 if desired.

  However, the pressure adjustment of the third can 5 may be controlled by a boiler 62 that supplies steam to the steam header 61 instead of such control. That is, the steam from the third can body 5 is supplied to the steam header 61 as it is without providing the pressure regulating valve 63 in the fourth steam path 60, and the steam pressure in the steam header 61 is maintained as desired. The amount of combustion of 62 may be controlled. In addition to the control by the pressure regulating valve 63, such control by the boiler 62 may be performed.

  By the way, when the use load of the steam does not decrease, the detection pressure of the second sensor 65 increases, and if it exceeds the set value, the steam supply operation valve 53 (or ejector) to the first steam engine 50 is detected. If the steam supply valve 59 to the nozzle of the ejector 55 and the steam supply valve 59 to the nozzle of the ejector 55 are controlled, steam supply from the first can body 3 and the second can body 4 through the ejector 55 is limited. Good. Alternatively, or in addition thereto, the three-way damper 43 may be controlled to limit the amount of exhaust gas supplied to the exhaust gas boiler 2 to limit the amount of evaporation by the exhaust gas boiler 2.

In the present embodiment, for example, the first can body 3 is 170 kg / h at 8 kgf / cm ² (= 0.78 MPa), the second can body 4 is 605 kg / h at 8 kgf / cm ² (= 0.78 MPa), Three cans 5 are 53 kg / h at 5 kgf / cm ² (= 0.49 MPa). The exhaust gas temperatures are 408 ° C. at the inlet of the first can body 3, 220 ° C. at the inlet of the second can body 4, 191 ° C. at the inlet of the third can body 5, and 173 ° C. at the outlet of the third can body 5. And 100 ° C. at the exit of the economizer 36. The steam after the steam from the second can 4 is decompressed by the ejector 55, the steam after the steam from the first steam engine 50 is pressurized by the ejector 55, and the steam from the third can 5 Are mixed to obtain an evaporation amount of 824 kg / h at 5 kgf / cm ² (= 0.49 MPa).

  FIG. 3 is a schematic view showing a second embodiment of the steam system 1 of the present invention, and a part thereof is omitted. The steam system 1 according to the second embodiment is basically the same as the first embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  In the first embodiment, the ejector 55 is used to depressurize the steam from the second can body 4 while the steam from the first steam engine 50 is increased. In the second embodiment, the second steam engine 66 is The steam from the second can 4 is used to reduce the pressure, while the steam compressor 67 driven by the second steam engine 66 is used to increase the pressure of the exhaust steam from the first steam engine 50.

  That is, the steam system 1 according to the second embodiment includes a second steam engine 66 that generates power using steam and a steam compressor 67 that is driven by the second steam engine 66 as the pressure increasing mechanism 54.

  The second steam engine 66 is a screw steam engine in this embodiment, but is not limited to a screw steam engine as long as it generates power using steam. For example, a steam turbine or a reciprocating steam engine using reciprocating piston movement may be used.

  The type of the steam compressor 67 is not particularly limited, but is, for example, a screw type steam compressor. However, the steam compressor 67 is not limited to a screw type as long as it compresses and discharges steam, and may be a reciprocating type.

  In the present embodiment, the steam from the second can body 4 is supplied to the second steam engine 66 through the second steam path 56. The steam supplied to the second steam engine 66 expands and is depressurized by working in the second steam engine 66, and is discharged to the fourth steam path 60. The steam compressor 67 driven by the second steam engine 66 sucks, compresses and discharges the exhaust steam from the first steam engine 50. In this manner, the steam after the exhaust steam from the first steam engine 50 has been pressurized by the steam compressor 67 and the steam after the steam from the second can body 4 has been decompressed by the second steam engine 66 are merged. Further, similarly to the first embodiment, the steam from the third can 5 may be joined.

  In the first embodiment, the economizers 34 to 36 corresponding to the number of cans 3 to 5 are provided. However, in the second embodiment, the number of economizers is one. In this case, the water preheated by the economizer 68 common to the cans 3 to 5 is branched and supplied to the cans 3 to 5. By controlling the water supply valves 70 to 72 individually provided in the water supply passages 16 to 18 to the cans 3 to 5 in a state where the water supply pump 69 is operated, water supply to the cans 3 to 5 is individually performed. Can be controlled. However, the economizer 68 may be provided for each of the cans 3 to 5 as in the first embodiment. Other configurations and controls are the same as those in the first embodiment, and a description thereof will be omitted.

  FIG. 4 is a schematic view showing a third embodiment of the steam system 1 of the present invention, and a part thereof is omitted. The steam system 1 according to the third embodiment is basically the same as the first embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  In the first embodiment, the steam supplied to the first steam engine 50 and the ejector 55 is the exhaust gas boiler 2, but in the second embodiment, a normal boiler (fuel burning boiler or electric boiler) 62 is used. . That is, the steam from the boiler 62 can be supplied to the first steam engine 50 and can also be supplied to the nozzles of the ejector 55. Further, instead of the control of the three-way damper 43 in each of the above-described embodiments, in this third embodiment, the combustion amount by the burner of the boiler 62 is controlled. In the third embodiment, the water supply to the boiler body of the boiler 62 is preheated by the economizer 68 provided in the flue of the boiler 62. Other configurations and controls are the same as those in the first embodiment, and a description thereof will be omitted.

  By the way, in the case of the present Example 3, the vapor | steam supplied to the 1st steam engine 50 and the vapor | steam supplied to the nozzle of the ejector 55 in order to pressure-up the waste steam from this 1st steam engine 50 are the same cans. Supplied from the body. However, as in the first embodiment, the steam supplied to the first steam engine 50 is different from the steam supplied to the nozzle of the ejector 55 in order to increase the pressure of the exhaust steam from the first steam engine 50. You may supply from a can. For example, two boilers 62 and 62 may be used to supply the steam from one boiler 62 to the first steam engine 50 and supply the steam from the other boiler 62 to the nozzle of the ejector 55.

  The use of the normal boiler 62 instead of the exhaust gas boiler 2 is similarly applied to the second embodiment as well as the first embodiment. That is, in FIG. 4, instead of the ejector 55, a second steam engine 66 and a steam compressor 67 driven thereby may be used as in FIG. In that case, the steam from the boiler 62 is supplied to the first steam engine 50 and the second steam engine 66, and the exhaust steam from the first steam engine 50 is boosted in the steam compressor 67.

  Next, the type of the water supply system to each can 3-5 in the said Example 1 and the said Example 2 is demonstrated. FIG. 5 to FIG. 7 are schematic views showing types of water supply methods to the cans 3 to 5 in the steam systems 1 of the first and second embodiments. The cans 3 to 5 and the economizers 34 to 36 are shown in FIG. Only shows. 5 to 7, the water from the water supply pump 72A branches after passing through the check valve 73 and passes to the economizers 34 to 36 through the water supply valves 74 to 76 and the check valves 77 to 79, respectively. After being supplied and preheated by the economizers 34 to 36, the cans 3 to 5 are supplied. In this case, whether or not to supply water to the economizers 34 to 36 and the cans 3 to 5 can be switched by controlling the opening and closing of the water supply valves 74 to 76 with the water supply pump 72A being operated. However, as shown in FIG. 1 and FIG. 3, by providing water supply pumps 37 to 39 for each economizer 34 to 36 and controlling each of the water supply pumps 37 to 39, each economizer 34 to 36 and each can 3 to 36 are controlled. The presence or absence of water supply to 5 may be switched.

  In FIG. 5, the economizers 34 to 36 are installed in series along the exhaust gas flow. When a plurality of economizers are installed, the economizers 34 to 36 are installed on the upstream side of the exhaust gas flow as they are installed on the upstream side of the exhaust gas flow. The example which preheats the water supply to the can body which is done is shown. Here, in order from the upstream side of the exhaust gas flow, the first can body 3, the second can body 4 and the third can body 5 are installed, and then, if desired, the first economizer 34, the second economizer 35 and the third economizer. Any one or more of 36 are installed.

  In FIG. 6, the economizers 34 to 36 are installed in series along the exhaust gas flow. When a plurality of economizers are installed, the economizers 34 to 36 are installed more downstream in the exhaust gas flow. The example which preheats the water supply to the can body which is done is shown. Here, in order from the upstream side of the exhaust gas flow, the first can body 3, the second can body 4 and the third can body 5 are installed, and then, if desired, a third economizer 36, a second economizer 35 and a first economizer. Any one or more of 34 are installed.

  FIG. 7 shows an example in which the economizers 34 to 36 are installed in parallel along the exhaust gas flow. Here, in order from the upstream side of the exhaust gas flow, the first can body 3, the second can body 4 and the third can body 5 are installed, and then, if desired, the first economizer 34, the second economizer 35 and the third economizer. Any one or more of 36 are installed in parallel.

  In any case, first, there is a pattern in which the economizers 34 to 36 are not installed at all and water is supplied to the cans 3 to 5 without an economizer. Alternatively, only one of the first economizer 34, the second economizer 35, and the third economizer 36 is installed, and any one of the first can body 3, the second can body 4, and the third can body 5 is installed. Only one water is supplied through an economizer, but there is a pattern in which water is supplied to other cans without an economizer.

  Further, any two of the first economizer 34, the second economizer 35, and the third economizer 36 are installed, and any one of the first can body 3, the second can body 4, and the third can body 5 is installed. One water is supplied through an economizer, but there is also a pattern in which the remaining cans are supplied without an economizer. For example, the first economizer 34 and the second economizer 35 are installed as shown by a solid line and a one-dot chain line in FIG. That is, water is supplied to the first can body 3 via the first economizer 34, water is supplied to the second can body 4 via the second economizer 35, and water is supplied to the third can body 5 without the economizer. In this case, the amount of heat recovered from the exhaust gas can be increased, and condensation in the economizer can be prevented.

  Further, there is a pattern in which all of the first economizer 34, the second economizer 35, and the third economizer 36 are installed. That is, water is supplied to the first can body 3 via the first economizer 34, water is supplied to the second can body 4 via the second economizer 35, and water is supplied to the third can body 5 via the third economizer 36. Supply water.

  The steam system of the present invention is not limited to the above embodiments, and can be changed as appropriate. In particular, if the first steam engine 50 that generates power using steam and the configuration that boosts the exhaust steam from the first steam engine 50, various configurations and controls including the boost mechanism can be changed as appropriate. It is.

  For example, in FIG. 1, the third can body 5 may be omitted, or the vapor pressure of the second can body 4 may be different from that of the first can body 3. Further, the steam pressure of the third can 5 may be different from the steam pressure after the steam from the first steam engine 50 is boosted by the ejector 55. In that case, the steam from the third can body 5 is used without being merged into the fourth steam path 60.

  Moreover, in each said Example, although the one or some economizer 34-36,68 was installed downstream of the exhaust gas boiler 2, installation of the economizer 34-36,68 is not essential. Furthermore, in the said Example 1 and Example 2, although the three can bodies 3-5 were provided, the number of can bodies can be changed suitably. Further, the vapor pressure and the evaporation amount of each can body can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Steam system 2 Exhaust gas boiler 3 1st can body 4 2nd can body 5 3rd can body 34 1st economizer 35 2nd economizer 36 3rd economizer 50 1st steam engine 51 Compressor (or electric motor)
54 Boosting Mechanism 55 Ejector 62 Boiler 66 Second Steam Engine 67 Steam Compressor 68 Economizer

Claims (1)

A first steam engine that uses steam to generate power,
A pressure increasing mechanism for increasing the pressure of the exhaust steam from the first steam engine using steam ;
The steam supplied to the first steam engine and the steam supplied to the booster mechanism for boosting the exhaust steam from the first steam engine are supplied from the same can body .
The boost mechanism includes an ejector,
The ejector sucks the exhaust steam from the first steam engine by injecting the steam different from the exhaust steam from the first steam engine into the nozzle, and the steam to the nozzle and the first steam engine from the first steam engine. discharged by mixing the waste steam,
A compressor or generator is driven by the first steam engine ;
If the pressure on the outlet side of the ejector exceeds a set value, the steam supply operation valve to the first steam engine or the suction valve to the suction port of the ejector and the steam supply valve to the nozzle of the ejector are controlled. A steam system that restricts steam supply from a boiler through the ejector, or controls the boiler instead of or in addition to the steam to limit the amount of evaporation by the boiler .

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