JP2015102258A - Steam generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam generation system capable of raising low pressure steam by a comparatively small amount of high pressure steam.SOLUTION: The steam generation system comprises: a first steam generation part 4 generating first steam W1; a second steam generation part 2 generating second steam W2 with higher pressure than that of the first steam W1; a first ejector 6 having a first vapor flow outlet 63 and generating third steam W3 with higher pressure than that of the first steam W1 and with lower pressure than that of the second steam W2 using the first steam W1 as suction steam and the second steam W2 as drive steam; a second ejector 7 having a second vapor flow inlet 71 and generating fourth steam W4 with higher pressure than that of the third steam W3 and with lower pressure than that of the second steam W2 using the third steam W3 as suction steam and the second steam W2 as drive steam; and a sixth steam supply line L6 which is branched from a third steam supply line L3 connecting between the first vapor flow outlet 63 and the second vapor flow inlet 71 and through which the third steam W3 flows.

Description

  The present invention relates to a steam generation system that pressurizes low-pressure steam.

  Much waste heat is generated from factories. The exhaust heat is extracted in the form of hot water, for example. The temperature of the hot water obtained from the exhaust heat is about 90 ° C. even when the temperature is high.

  For use of heat in a general factory, medium pressure steam of about 0.1 to 1.0 MPa (G) is required. However, only the low-pressure steam can be produced from the hot water of about 90 ° C. as described above, and the use of the hot water obtained from the exhaust heat is limited.

  In order to solve the above problem, Patent Document 1 proposes a steam generation system including a heat pump and an ejector. In the steam generation system, the heat pump generates low-pressure steam by heating the feed water with hot water obtained from exhaust heat. On the other hand, the ejector uses the low-pressure steam as suction steam and the high-pressure steam supplied from a boiler or the like as driving steam, and boosts the low-pressure steam to medium-pressure steam that can be used in a factory. Thus, the use of hot water obtained from exhaust heat can be expanded by using a heat pump and an ejector.

JP 2012-159238 A

  However, the ejector requires a large amount of high-pressure steam as driving steam in order to increase the pressure of low-pressure steam. Therefore, a factory that cannot sufficiently supply a large amount of high-pressure steam cannot install the steam generation system.

  An object of the present invention is to provide a steam generation system that pressurizes low-pressure steam with a relatively small amount of high-pressure steam.

  The present invention includes a first steam generating unit that generates first steam, a second steam generating unit that generates second steam having a pressure higher than that of the first steam, a first suction steam inlet, A first ejector having a driving steam inlet and a first discharge steam outlet, wherein the first suction steam inlet is connected to the first steam generator via a first steam supply line, and The driving steam inlet is connected to the second steam generating unit via a second steam supply line, uses the first steam as suction steam and uses the second steam as driving steam, A first ejector configured to generate a third steam having a pressure higher than that of the first steam and lower than that of the second steam, and causing the third steam to flow out from the first discharge steam outlet; and a second suction steam A second ejector having an inlet, a second drive steam inlet, and a second discharge steam outlet The second suction steam inlet is connected to the first discharge steam outlet via a third steam supply line, and the second driving steam inlet is branched from the second steam supply line. Connected to a fourth steam supply line, and the second discharge steam outlet is connected to a fifth steam supply line, uses the third steam flowing through the third steam supply line as suction steam, and Using the second steam flowing through the four steam supply lines as driving steam, generating a fourth steam having a pressure higher than that of the third steam and lower than that of the second steam; The present invention relates to a steam generation system comprising: a second ejector that causes steam to flow out to the fifth steam supply line; and a sixth steam supply line that branches from the third steam supply line and distributes the third steam.

  The steam generation system may further include a hot water supply unit that supplies hot water, and the first steam generation unit generates the first steam using the hot water supplied from the hot water supply unit. preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the steam generation system which pressurizes low pressure steam with a comparatively small amount of high pressure steam can be provided.

1 is an overall configuration diagram of a steam generation system 1 according to an embodiment.

  Hereinafter, an embodiment of a steam generation system according to the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a steam generation system 1 according to an embodiment.

  As shown in FIG. 1, the steam generation system 1 according to the embodiment includes a once-through boiler 2 as a second steam generation unit, a steam header 3, a steam generation device 4 as a first steam generation unit, and a hot water supply unit. As a hot water tank 5, a first ejector 6, a second ejector 7, a first steam pressure adjusting valve 8, a second steam pressure adjusting valve 9, a suction steam supply valve 10, and a first drive steam supply valve. 11, a second drive steam supply valve 12, and a control unit 13.

  Further, the steam generation system 1 includes a first steam supply line L1, a second steam supply line L2, a third steam supply line L3, a fourth steam supply line L4, a fifth steam supply line L5, and a sixth steam supply line L2. A steam supply line L6, a hot water supply line L7, a hot water discharge line L8, a water supply line L9, a fuel supply line L10, and an exhaust hot water supply line L11 are provided. The “line” in the present specification is a general term for lines capable of flowing a fluid such as a flow path, a radial path, and a pipeline.

  Each line is provided with devices such as various valves, various sensors, check valves, orifices, strainers and the like as necessary, but the illustration is omitted as appropriate in FIG.

  The upstream end of the first steam supply line L <b> 1 is connected to the steam supply outlet of the steam generator 4. The downstream end of the first steam supply line L <b> 1 is connected to the first suction steam inlet 61 of the first ejector 6. A suction steam supply valve 10 is provided in the middle of the first steam supply line L1. The first steam W1 generated by the steam generator 4 flows through the first steam supply line L1 and is supplied toward the first ejector 6 via the suction steam supply valve 10.

  The upstream end of the hot water supply line L7 is connected to the outlet of the hot water tank 5. The downstream end of the hot water supply line L7 is connected to the hot water inlet of the steam generator 4. The warm water W7 flowing out from the warm water tank 5 flows through the warm water supply line L7 and is supplied toward the steam generator 4.

  The upstream end of the hot water discharge line L8 is connected to the hot water outlet of the steam generator 4. The downstream end of the hot water discharge line L8 communicates with the outside. Hot water W8 having a temperature lower than that of the hot water W7 discharged from the steam generator 4 is circulated through the hot water discharge line L8 and discharged to the outside.

  The upstream end of the exhaust hot water supply line L11 is connected to a hot water supply source (not shown) in a factory or the like. The downstream end of the exhaust hot water supply line L <b> 11 is connected to the inflow port of the hot water tank 5. Hot water W7 obtained by recovering heat from the exhaust gas generated in the load device is supplied to the hot water tank 5 through the exhaust hot water supply line L11.

  The upstream end of the water supply line L9 is connected to a water supply source (not shown) of the water supply W9. The downstream end of the water supply line L <b> 9 branches, one end is connected to the once-through boiler 2, and the other end is connected to the steam generator 4. The water supply W9 supplied from a water supply source (not shown) is supplied to the once-through boiler 2 and the steam generator 4 through the water supply line L9.

  The suction steam supply valve 10 adjusts the opening degree of the valve body so that the flow rate of the first steam W1 supplied to the first suction steam inlet 61 of the first ejector 6 can be adjusted. The opening degree of the suction steam supply valve 10 is controlled by the control unit 13.

  The steam generating device 4 is a device that generates the first steam W1 using the hot water W7 supplied from the hot water tank 5. The steam generator 4 includes a heat exchanger, a pressure vessel, a steam supply port, a hot water inlet, and a hot water outlet. The water supply W9 supplied from a water supply source (not shown) exchanges heat with the hot water W7 supplied from the hot water tank 5 through a heat exchanger. The water supply W9 warmed by the heat exchange is then sent to the pressure vessel, sprayed in the pressure vessel, and further evaporated while performing heat exchange with the hot water W7. As a result, the first steam W1 is generated. The generated first steam W1 is a relatively low-pressure steam. The steam generating device 4 distributes the generated first steam W1 to the first steam supply line L1 and supplies the first steam W1 to the first ejector 6 through the suction steam supply valve 10.

  The hot water tank 5 is a facility for storing hot water W7 generated from exhaust heat from a factory or the like and supplying the hot water W7 to the steam generator 4. The hot water tank 5 and the steam generator 4 are connected by a hot water supply line L7.

  The upstream end of the second steam supply line L <b> 2 is connected to the once-through boiler 2. The downstream end of the second steam supply line L2 is connected to the first drive steam inlet 62 of the first ejector 6. A steam header 3 is provided in the middle of the second steam supply line L2. In the second steam supply line L2, a branch point J1 that branches the second steam supply line L2 to the fourth steam supply line L4 is provided between the steam header 3 and the first ejector 6. A first driving steam supply valve 11 is provided between the branch point J1 and the first ejector 6.

  The first drive steam supply valve 11 adjusts the opening degree of the valve body to make it possible to adjust the flow rate of the second steam W2 supplied to the first drive steam inlet 62 of the first ejector 6. The opening degree of the first drive steam supply valve 11 is controlled by the control unit 13.

  The second steam W2 generated in the once-through boiler 2 flows through the second steam supply line L2 and passes through the steam header 3, and then at the branch point J1, the second steam supply line L2 and the fourth steam supply line L4 Branch to circulate. Accordingly, a part of the second steam W <b> 2 flows through the second steam supply line L <b> 2 and is supplied to the first ejector 6 through the first drive steam supply valve 11. Further, the remaining portion of the second steam W2 flows through the fourth steam supply line L4 and is supplied to the second ejector 7.

  The upstream end of the fourth steam supply line L4 is connected to a branch point J1 in the second steam supply line L2. The downstream end of the fourth steam supply line L4 is connected to the second drive steam inlet 72 of the second ejector 7. A second drive steam supply valve 12 is provided in the middle of the fourth steam supply line L4. The remaining portion of the second steam W2 supplied from the branch point J1 in the second steam supply line L2 flows through the fourth steam supply line L4 and is directed to the second ejector 7 via the second drive steam supply valve 12. Supplied.

  The second drive steam supply valve 12 adjusts the opening degree of the valve body so that the flow rate of the second steam W2 supplied to the second drive steam inlet 72 of the second ejector 7 can be adjusted. The opening degree of the second drive steam supply valve 12 is controlled by the control unit 13.

  The upstream end of the third steam supply line L3 is connected to the first discharge steam outlet 63 of the first ejector 6. The downstream end of the third steam supply line L3 is connected to the second suction steam inlet 71 of the second ejector 7. A branch point J2 that branches the third steam supply line L3 to the sixth steam supply line L6 is provided in the middle of the third steam supply line L3.

  The third steam W3 flowing out from the first ejector 6 flows to the third steam supply line L3, and then branches to the third steam supply line L3 and the sixth steam supply line L6 at the branch point J2. . Accordingly, a part of the third steam W3 is supplied to the second ejector 7 through the third steam supply line L3.

  The upstream end of the sixth steam supply line L6 is connected to a branch point J2 in the third steam supply line L3. The downstream end of the sixth steam supply line L6 is connected to a load device A that operates with steam at a pressure higher than that of the first steam W1 and lower than that of the second steam W2. In the sixth steam supply line L6, a first steam pressure adjusting valve 8 is provided between the branch point J2 and the load device A. The remaining portion of the third steam W3 flows through the sixth steam supply line L6 and is supplied to the load device A that operates with steam higher in pressure than the first steam W1 and lower in pressure than the second steam W2.

  The first steam pressure adjusting valve 8 adjusts the opening degree of the valve body to adjust the pressure of the third steam W3 supplied to the load device A to a predetermined pressure.

  The upstream end of the fifth steam supply line L5 is connected to the second discharge steam outlet 73 of the second ejector 7. The downstream end of the fifth steam supply line L5 is connected to a load device B that operates with steam at a pressure higher than that of the third steam W3 and lower than that of the second steam W2. A second steam pressure regulating valve 9 is provided in the middle of the fifth steam supply line L5.

  The second steam pressure adjusting valve 9 adjusts the opening degree of the valve body to adjust the pressure of the fourth steam W4 supplied to the load device B to a predetermined pressure.

  The fourth steam W4 flowing out from the second ejector 7 flows through the fifth steam supply line L5, and after the pressure is adjusted to a predetermined pressure by the second steam pressure adjusting valve 9, it is more than the third steam W3. It is supplied to a load device B that operates with high-pressure and lower-pressure steam than the second steam W2.

  The once-through boiler 2 is a facility that heats feed water W9 supplied from a feed water supply source (not shown) to generate a relatively high-pressure second steam W2. The once-through boiler 2 includes a boiler body 21 that is a can.

The boiler body 21 includes a lower header, a water tube, a burner, and an upper header (all not shown).
The upper header is, for example, a hollow container formed in an annular shape. The upper end of each water pipe communicates with the upper header. The upstream end of the second steam supply line L2 is connected to the upper end of the upper header. The second steam W2 generated in the plurality of water pipes is sent to the second steam supply line L2 via the upper header.

  The burner unit is a combustion device that burns fuel G1 (liquid or gas, etc.). A fuel supply line L10 is connected to the burner portion. The fuel supply line L10 is a line that supplies the fuel G1 sent from a fuel supply source (not shown) to the burner unit.

  The steam header 3 temporarily accumulates the second steam W2 supplied from the once-through boiler 2 via the second steam supply line L2, and first and second ejectors 6 and 7 that use the second steam W2. It is equipment to supply to. The steam header 3 is provided between the once-through boiler 2 and the first drive steam supply valve 11 in the second steam supply line L2.

  The first ejector 6 uses the first steam W1 as suction steam and the second steam W2 as driving steam, and has a pressure higher than that of the first steam W1 and lower than that of the second steam W2. 3 is a device that generates three steam W3.

The first ejector 6 includes a first suction steam inlet 61, a first drive steam inlet 62, and a first discharge steam outlet 63. The second steam W2 flowing through the second steam supply line L2 flows from the first drive steam inlet 62 of the first ejector 6 into the first ejector 6 as drive steam.
As a result, the first steam W1 flowing through the first steam supply line L1 flows into the first ejector 6 as suction steam at the first suction steam inlet 61 of the first ejector 6.

  In the first ejector 6, the first steam W1 and the second steam W2 are mixed to generate a third steam W3. The generated third steam W3 flows out from the first discharge steam outlet 63 of the first ejector 6 and flows to the third steam supply line L3.

  The second ejector 7 uses the third steam W3 as suction steam and uses the second steam W2 as driving steam, and has a pressure higher than that of the third steam W3 and lower than that of the second steam W2. 4 is a device that generates four steams W4.

The second ejector 7 includes a second suction steam inlet 71, a second drive steam inlet 72, and a second discharge steam outlet 73. The second steam W2 flowing through the fourth steam supply line L4 flows from the second drive steam inlet 72 of the second ejector 7 into the second ejector 7 as drive steam.
As a result, a part of the third steam W3 flowing through the third steam supply line L3 flows into the second ejector 7 as suction steam at the second suction steam inlet 71 of the second ejector 7.

  In the second ejector 7, the second steam W2 and the third steam W3 are mixed to generate the fourth steam W4. The generated fourth steam W4 flows out from the second discharge steam outlet 73 of the second ejector 7, flows to the fifth steam supply line L5, and passes through the second steam pressure regulating valve 9 to the load device B. To be supplied.

  The control unit 13 is electrically connected to the suction steam supply valve 10, the first drive steam supply valve 11, and the second drive steam supply valve 12. The control unit 13 transmits an information signal related to opening / closing (opening) of the valve body to the suction steam supply valve 10, the first drive steam supply valve 11, and the second drive steam supply valve 12.

  The steam generation system 1 having the above configuration operates as shown in the following embodiment. FIG. 1 is an overall configuration diagram of a steam generation system 1 according to an embodiment.

  First, in the steam generator 4, heat exchange is performed between the water supply W <b> 9 supplied from a water supply supplier (not shown) and the hot water W <b> 7 supplied from the hot water tank 5. The water supply W9 heated by heat exchange is sent to the pressure vessel in the steam generator 4, sprayed into the pressure vessel, and further evaporated while performing heat exchange with the hot water W7. At this time, the first steam W1 having a relatively low pressure is generated in the pressure vessel. The first steam W <b> 1 flows through the first steam supply line L <b> 1, the flow rate is adjusted by the suction steam supply valve 10, and then supplied to the first suction steam inlet 61 of the first ejector 6. Here, the pressure of the first steam W1 supplied to the first ejector 6 is, for example, −0.02 MPa, and the flow rate thereof is 150 kg / h.

  The hot water W8, which has been deprived of heat after the heat exchange with the feed water W9 in the steam generator 4, flows through the hot water discharge line L8 and is discharged to the outside.

  On the other hand, the once-through boiler 2 uses the fuel G1 supplied from the fuel supply source (not shown) and heats the feed water W9 supplied from the feed water supply source (not shown), so that it is more than the first steam W1. High-pressure second steam W2 is generated. The second steam W2 flows through the second steam supply line L2 and passes through the steam header 3, and then at the branch point J1 provided in the second steam supply line L2, the second steam supply line L2 and the fourth steam It branches and distributes to the supply line L4.

  In the second steam supply line L2, the flow rate of the second steam W2 flowing downstream from the branch point J1 is adjusted by the first drive steam supply valve 11, and then the first drive steam flow of the first ejector 6 is adjusted. It is supplied to the inlet 62. The second steam W2 flowing through the fourth steam supply line L4 is supplied to the second drive steam inlet 72 of the second ejector 7 after the flow rate is adjusted by the second drive steam supply valve 12.

  Here, the pressure of the second steam W2 flowing upstream from the branch point J1 of the second steam supply line L2 is, for example, 0.5 MPa, and the flow rate thereof is 1320 kg / h. The pressure of the second steam W2 supplied to the first drive steam inlet 62 of the first ejector 6 is, for example, 0.5 MPa, and the flow rate is 750 kg / h. Further, the pressure of the second steam W2 supplied to the second drive steam inlet 72 of the second ejector 7 is, for example, 0.5 MPa, and the flow rate thereof is 570 kg / h.

  Through the above operation, the second steam W2 having a pressure of 0.5 MPa flows as drive steam from the first drive steam inlet 62 of the first ejector 6 into the first ejector 6. As a result, the first steam W1 having a pressure of −0.02 MPa flows from the first suction steam inlet 61 of the first ejector 6 into the first ejector 6 as suction steam.

  In the first ejector 6, the first steam W1 and the second steam W2 are mixed to generate a third steam W3 that is higher in pressure than the first steam W1 and lower in pressure than the second steam W2. . The generated third steam W3 flows out from the first discharge steam outlet 63 of the first ejector 6 and flows to the third steam supply line L3. Here, the pressure of the third steam W3 flowing through the third steam supply line L3 is, for example, 0.06 MPa, and the flow rate thereof is 900 kg / h.

  Accordingly, the first ejector 6 uses the second steam W2 having a pressure higher than that of the first steam W1 to increase the pressure of the first steam W1 having a pressure lower than that of the second steam W2, so that the first steam A third steam W3 having a pressure higher than W1 and a pressure lower than that of the second steam W2 is caused to flow out.

  Next, the third steam W3 branches and flows into the third steam supply line L3 and the sixth steam supply line L6 at a branch point J2 provided in the middle of the third steam supply line L3.

  The third steam W3 flowing downstream from the branch point J2 in the third steam supply line L3 is supplied to the second suction steam inlet 71 of the second ejector 7. The third steam W3 flowing through the sixth steam supply line L6 is adjusted to a predetermined pressure by the first steam pressure adjusting valve 8, and then the second steam W2 is higher in pressure than the first steam W1. It is supplied to load equipment A that operates with lower pressure steam.

  Here, the pressure of the third steam W3 supplied to the second suction steam inlet 71 of the second ejector 7 is, for example, 0.06 MPa, and the flow rate thereof is 150 kg / h. Moreover, the pressure of the 3rd steam W3 supplied to the load apparatus A which operate | moves with the steam of the pressure higher than the 1st steam W1 and the pressure of the 2nd steam W2 is 0.06 MPa, for example, and the flow rate is 750 kg / h.

  Through the above operation, the second steam W2 having a pressure of 0.5 MPa flows as drive steam from the second drive steam inlet 72 of the second ejector 7 into the second ejector 7. As a result, the third steam W3 having a pressure of 0.06 MPa flows from the second suction steam inlet 71 of the second ejector 7 into the second ejector 7 as suction steam.

  In the second ejector 7, the second steam W2 and the third steam W3 are mixed to generate a fourth steam W4 that is higher in pressure than the third steam W3 and lower in pressure than the second steam W2. . The generated fourth steam W4 flows out from the second discharge steam outlet 73 of the second ejector 7 and flows to the fifth steam supply line L5. Here, the pressure of the fourth steam W4 flowing through the fifth steam supply line L5 is, for example, 0.2 MPa, and the flow rate thereof is 720 kg / h.

  Therefore, the second ejector 7 uses the second steam W2 having a pressure higher than that of the third steam W3 to increase the pressure of the third steam W3 having a pressure lower than that of the second steam W2, thereby increasing the third steam. A fourth steam W4 having a pressure higher than W3 and lower than the second steam W2 is caused to flow out.

  The fourth steam W4 flows through the fifth steam supply line L5, and after the pressure is adjusted to a predetermined pressure by the second steam pressure adjusting valve 9 provided in the middle of the fifth steam supply line L5, the fourth steam W4 is relatively high in pressure. Is supplied to the load equipment B that operates on the steam.

The steam generation system 1 according to the present embodiment having the above-described configuration has the following effects.
The steam generation system 1 in the present embodiment includes a steam generator 4 that generates the first steam W1, a once-through boiler 2 that generates the second steam W2 having a pressure higher than that of the first steam W1, and a first suction steam. The first ejector 6 includes an inlet 61, a first drive steam inlet 62, and a first discharge steam outlet 63, and the first suction steam inlet 61 is connected to the steam generator via the first steam supply line L1. 4, the first driving steam inlet 62 is connected to the once-through boiler 2 via the second steam supply line L2, and uses the first steam W1 as suction steam and uses the second steam W2 as driving steam. To generate a third steam W3 having a pressure higher than that of the first steam W1 and lower than that of the second steam W2, and causing the third steam W3 to flow out from the first discharge steam outlet 63. The ejector 6, the second suction steam inlet 71, the second The second ejector 7 includes a driving steam inlet 72 and a second discharge steam outlet 73, and the second suction steam inlet 71 is connected to the first discharge steam outlet 63 via the third steam supply line L3. The second drive steam inlet 72 is connected to the fourth steam supply line L4 branched from the second steam supply line L2, and the second discharge steam outlet 73 is connected to the fifth steam supply line L5. The third steam W3 flowing through the third steam supply line L3 is used as suction steam, and the second steam W2 flowing through the fourth steam supply line L4 is used as driving steam, so that it is more than the third steam W3. A second ejector 7 that generates a fourth steam W4 at a high pressure and a pressure lower than that of the second steam W2, and flows the fourth steam W4 to the fifth steam supply line L5 is branched from the third steam supply line L3. , Flowing the third steam W3 Comprising a sixth steam supply line L6 to the.

  For this reason, the third steam W3 flowing through the sixth steam supply line L6 is branched from the branch point J2 to the third steam supply line L3 and the sixth steam supply line L6. Thereby, the flow volume of the 3rd vapor | steam W3 supplied to the 2nd ejector 7 reduces. Generally, when the pressure of a gas is increased using an ejector, driving steam that is about 5 to 6 times the flow rate of the sucked gas is required. Therefore, the steam generation system 1 supplies a part of the third steam W3 boosted by the first ejector 6 as suction steam to the second ejector 7, so that the drive required for boosting the second ejector 7 is achieved. It becomes possible to reduce the flow rate of steam. That is, the low-pressure steam can be boosted with a relatively small amount of high-pressure steam.

In addition, since the steam generation system 1 uses only the part of the third steam W3 boosted by the first ejector 6 in the second ejector 7, the fourth ejector 7 generates more than necessary fourth steam W4. Can be suppressed.
Furthermore, the steam generation system 1 causes the third steam W3 flowing through the sixth steam supply line L6 branched from the third steam supply line L3 to be higher in pressure than the first steam W1 and lower in pressure than the second steam W2. It can be used for the load equipment A that operates on the steam.

  Moreover, the steam generation system 1 in the present embodiment further includes a hot water tank 5 that supplies hot water, and the steam generation device 4 generates the first steam W1 using the hot water W7 supplied from the hot water tank 5. .

  For this reason, the steam generation system 1 can produce | generate the 4th steam W4 of the medium pressure which can be utilized again in a factory effectively using the warm water W7 produced | generated from exhaust heat, such as a factory.

As mentioned above, although preferable embodiment of the steam generation system 1 of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, the steam generation system 1 includes a first ejector 6 and a second ejector 7 and generates a fourth steam W4 having an intermediate pressure. However, the present invention is not limited to this, and the steam generation system may be configured to include, for example, three or more ejectors and further generate medium-pressure steam.

  In addition, the steam generation system 1 includes the steam generation device 4 and generates the first steam having a relatively low pressure. However, the present invention is not limited to this, and the steam generation system may include a flash tank, an absorption heat pump, and other equipment for generating low-pressure steam.

  In addition, the steam generation system 1 includes a once-through boiler 2 as a second steam generation unit, heats feed water W9 supplied from a feed water supply source (not shown), and generates a relatively high-pressure second steam W2. It was generated. However, the present invention is not limited to this, and the second steam generation unit may be a heat pump or other equipment that generates relatively high-pressure steam.

1 Steam generation system 2 Through-flow boiler (second steam generator)
4 Steam generator (first steam generator)
6 First ejector 7 Second ejector 61 First suction steam inlet 62 First drive steam inlet 63 First discharge steam outlet 71 Second suction steam inlet 72 Second drive steam inlet 73 Second discharge steam outlet L1 1st steam supply line L2 2nd steam supply line L3 3rd steam supply line L4 4th steam supply line L5 5th steam supply line L6 6th steam supply line W1 1st steam W2 2nd steam W3 3rd Steam W4 4th steam

Claims (2)

A first steam generating section for generating first steam;
A second steam generating section for generating second steam having a pressure higher than that of the first steam;
A first ejector comprising a first suction steam inlet, a first drive steam inlet, and a first discharge steam outlet, wherein the first suction steam inlet is connected to the first steam via a first steam supply line. Connected to the generator, the first drive steam inlet is connected to the second steam generator via a second steam supply line, and uses the first steam as suction steam and the second steam. Is used as driving steam to generate third steam that is higher in pressure than the first steam and lower in pressure than the second steam, and causes the third steam to flow out from the first discharge steam outlet. The first ejector;
A second ejector comprising a second suction steam inlet, a second drive steam inlet, and a second discharge steam outlet, wherein the second suction steam inlet is connected to the first discharge via a third steam supply line. Connected to a steam outlet, the second drive steam inlet is connected to a fourth steam supply line branched from the second steam supply line, and the second discharge steam outlet is connected to a fifth steam supply line. The third steam connected and using the third steam flowing through the third steam supply line as suction steam and using the second steam flowing through the fourth steam supply line as driving steam, the third steam A second ejector for generating a fourth steam at a pressure higher than the steam and lower than the second steam, and causing the fourth steam to flow into the fifth steam supply line;
A steam generation system comprising: a sixth steam supply line that branches from the third steam supply line and distributes the third steam. It further comprises a hot water supply part for supplying hot water,
The steam generation system according to claim 1, wherein the first steam generation unit generates the first steam using hot water supplied from the hot water supply unit.

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