Low-pressure cylinder zero-output coupling steam heat accumulator

Abstract

The invention discloses a low-pressure cylinder zero-output coupling steam heat accumulator which comprises an intermediate-pressure cylinder connected with a reheating hot section of a steam turbine; the low-pressure cylinder is connected with the output end of the medium-pressure cylinder; a cooling steam source is also connected; the generator is connected with the output end of the medium-pressure cylinder and / or the low-pressure cylinder to generate electric energy; the condenser is connected with the output end of the low-pressure cylinder; the condensate pump is connected with the output end of the condenser and further connected with the output end of the intermediate-pressure cylinder. The steam heat accumulator is connected with the output end of the medium-pressure cylinder; and the regenerative heating mechanism is respectively connected with the output ends of the steam heat accumulator and the intermediate pressure cylinder and is also connected with the input end of the condensate pump. In the deep peak regulation period of the unit, cooling steam enters the low-pressure cylinder, output of the unit can be reduced, part of heat is released through the steam heat accumulator, return water is heated and output through the regenerative heating mechanism, and deep peak regulation and thermoelectric decoupling of the unit are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a low-pressure cylinder zero-output coupled steam accumulator. Background Art

[0003] Traditional cogeneration units usually use low-pressure cylinder zero-output transformation technology when participating in deep peak regulation. This technology reduces the unit's power output by cutting off the steam inlet to the low-pressure cylinder and using the low-pressure cylinder as an air cooler to meet the peak regulation needs of the power grid. Low-pressure cylinder zero-output transformation technology has the advantages of low transformation cost, simple system and outstanding deep peak regulation capability, which can significantly reduce the unit's grid-connected power during deep peak regulation.

[0004] However, although the low-pressure cylinder zero-output transformation technology improves the peak-shaving capacity of the unit, it still has a strong coupling phenomenon between heat and electricity. In the "heat-to-electricity" operation mode, the power generation of the cylinder-cutting unit is basically linearly related to the heat supply, which limits the adjustment flexibility of the unit. When the power system needs to respond quickly to load changes, traditional cogeneration units may not be able to meet the requirements.

[0005] To solve this problem, configuring a heat storage system has become a feasible solution. The heat storage system can achieve the migration of heat in time, storing excess heat and releasing it when needed to achieve the effect of peak shaving and valley filling. However, conventional heat storage methods, such as atmospheric pressure water storage tanks, have disadvantages such as low energy storage density, large footprint, and high initial investment, which are not suitable for the actual operation of power plants.

[0006] As a pressurized heat storage device, the steam accumulator has the advantages of high heat storage density and strong adjustable performance. It can store up to about 2.5MPa of saturated water, which is much higher than the energy storage density of normal pressure water storage tanks. Therefore, combining the steam accumulator with the low-pressure cylinder zero-output technology is expected to become an effective way to solve the problem of strong heat-electric coupling in cogeneration units and improve the flexibility of the units. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a low-pressure cylinder zero-output coupled steam accumulator.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] An embodiment of the present invention provides a low-pressure cylinder zero-output coupled steam accumulator, comprising:

[0010] The intermediate pressure cylinder is connected to the reheating hot section of the steam turbine;

[0011] A low-pressure cylinder is connected to the output end of the medium-pressure cylinder and is also connected to a cooling steam source;

[0012] A generator connected to the output end of the medium-pressure cylinder and / or the low-pressure cylinder to generate electrical energy;

[0013] a condenser connected to an output end of the low-pressure cylinder;

[0014] A condensate pump connected to the output end of the condenser and also connected to the output end of the medium-pressure cylinder;

[0015] A steam accumulator connected to the output end of the intermediate pressure cylinder;

[0016] The heat recovery heating mechanism is respectively connected to the output ends of the steam heat accumulator and the intermediate pressure cylinder, and is also connected to the input end of the condensate pump.

[0017] Preferably, the intermediate pressure cylinder is also connected to the cooling steam source.

[0018] Preferably, the heat recovery heating mechanism includes a first heat exchanger, a second heat exchanger, and a heat network return water component; the first heat exchanger is connected to the output end of the steam accumulator, the second heat exchanger is connected to the output end of the intermediate pressure cylinder, and the heat network return water component is respectively connected to the first heat exchanger and the second heat exchanger.

[0019] Preferably, the heating network return water component includes a heating network return water end, a heating network supply water end, and a heat exchange pipeline, the heat exchange pipeline is respectively connected to the first heat exchanger and the second heat exchanger, and the heating network return water end and the heating network supply water end are respectively arranged at the input end and the output end of the heat exchange pipeline.

[0020] Preferably, a first electrically-controlled valve is arranged on the heat exchange pipeline between the return water end of the heating network and the first heat exchanger, and a second electrically-controlled valve is arranged between the return water end of the heating network and the second heat exchanger; a third electrically-controlled valve is arranged on the heat exchange pipeline between the supply water end of the heating network and the first heat exchanger, and a fourth electrically-controlled valve is arranged between the supply water end of the heating network and the second heat exchanger.

[0021] Preferably, a fifth electrically-controlled valve is provided between the steam accumulator and the first heat exchanger, and a sixth electrically-controlled valve is provided between the intermediate-pressure cylinder and the second heat exchanger.

[0022] Preferably, the output end of the intermediate pressure cylinder is respectively connected to the condensate pump, the steam accumulator and the heat recovery heating mechanism through the first pipeline; a seventh electrically controlled valve is arranged between the output end of the intermediate pressure cylinder and the first pipeline, an eighth electrically controlled valve is arranged on the first pipeline between the intermediate pressure cylinder and the steam accumulator, and a ninth electrically controlled valve is arranged between the intermediate pressure cylinder and the condensate pump.

[0023] Preferably, a tenth electrically controlled valve is provided between the intermediate pressure cylinder and the turbine reheating hot section; and an eleventh electrically controlled valve is provided between the low pressure cylinder and the condenser.

[0024] Preferably, the cooling steam source is connected to the medium-pressure cylinder and the low-pressure cylinder respectively through a second pipeline.

[0025] Preferably, a twelfth electrically controlled valve is provided on the second pipeline between the cooling steam source and the medium-pressure cylinder, and a thirteenth electrically controlled valve is provided between the cooling steam source and the low-pressure cylinder.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The above technical solution provides a low-pressure cylinder zero-output coupled steam accumulator. During the deep peak regulation of the unit, the output of the unit can be reduced by cooling the steam entering the low-pressure cylinder, and part of the heat can be released through the steam accumulator. The return water is heated and output through the heat recovery heating mechanism, thereby realizing deep peak regulation and thermoelectric decoupling of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A structural schematic diagram of a low-pressure cylinder zero-output coupled steam accumulator is provided for an embodiment of the present invention.

[0030] Figure 2 A thermoelectric regulation range of low-pressure cylinder zero output in a low-pressure cylinder zero output coupled steam accumulator is provided for an embodiment of the present invention.

[0031] Figure 3 A system thermoelectric regulation range of a low-pressure cylinder zero-output coupled steam accumulator is provided for an embodiment of the present invention.

[0032] Description of reference numerals:

[0034] 1. Intermediate pressure cylinder; 101. Turbine reheat hot section; 102. First pipeline; 2. Low pressure cylinder; 201. Cooling steam source; 2011. Second pipeline; 3. Generator; 4. Condenser; 5. Condensate pump; 6. Steam accumulator; 7. Regenerative heating mechanism; 71. First heat exchanger; 72. Second heat exchanger; 73. Heat network return water assembly; 731. Heat network return water end; 732. Heat network feed water end; 733. Heat exchange pipeline; 8. First electric control valve; 9. Second electric control valve; 10. Third electric control valve; 11. Fourth electric control valve; 12. Fifth electric control valve; 13. Sixth electric control valve; 14. Seventh electric control valve; 15. Eighth electric control valve; 16. Ninth electric control valve; 17. Tenth electric control valve; 18. Eleventh electric control valve; 19. Twelfth electric control valve; 20. Thirteenth electric control valve. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 1 The embodiment of the present invention provides a low-pressure cylinder zero-output coupled steam accumulator, comprising: an intermediate-pressure cylinder 1, a low-pressure cylinder 2, a generator 3, a condenser 4, a condensate pump 5, a steam accumulator 6, and a heat recovery heating mechanism 7.

[0039] The intermediate pressure cylinder 1 is connected to the turbine reheating hot section 101, and is used to further expand and reduce the pressure of the steam in the turbine reheating hot section 101, and convert its thermal energy into mechanical energy, and is also used to transport the steam after work to the low pressure cylinder 2 and the steam accumulator 6; the low pressure cylinder 2 is connected to the output end of the intermediate pressure cylinder 1; it is also connected to the cooling steam source 201, and is used to reduce the temperature and pressure in the low pressure cylinder 2 by introducing cooling steam, thereby reducing the output power of the low pressure cylinder 2, and then achieving the purpose of reducing the overall output of the unit, and is also used to further expand and reduce the pressure of the steam after work in the intermediate pressure cylinder 1, and convert the remaining thermal energy into mechanical energy; the generator 3 is connected to the output end of the intermediate pressure cylinder 1 and / or the low pressure cylinder 2, and is used to convert the mechanical energy of the intermediate pressure cylinder 1 and / or the low pressure cylinder 2 into mechanical energy. into electrical energy; the condenser 4 is connected to the output end of the low-pressure cylinder 2, and is used to reduce the exhaust temperature and exhaust pressure of the low-pressure cylinder 2, thereby improving the heat cycle efficiency, and at the same time condenses the exhaust steam into water and transmits it to the condensate pump 5. The condensate pump 5 is connected to the output end of the condenser 4 and is also connected to the output end of the intermediate-pressure cylinder 1, and is used to extract the condensate in the condenser 4 and send it to the heat recovery heating mechanism 7 or other water points; the steam accumulator 6 is connected to the output end of the intermediate-pressure cylinder 2, and is used to store the exhaust steam of the intermediate-pressure cylinder 1; the heat recovery heating mechanism 7 is respectively connected to the output ends of the steam accumulator 6 and the intermediate-pressure cylinder 1, and is also connected to the input end of the condensate pump 5, and is used to reuse the condensate of the condensate pump 5, and heat it with the heat source provided by the steam accumulator 6 and the intermediate-pressure cylinder 1.

[0040] During the deep peak regulation of the unit, the present invention can reduce the output of the unit by cooling the steam entering the low-pressure cylinder 2, release part of the heat through the steam accumulator 6, and heat and output the return water through the heat recovery heating mechanism 7, thereby realizing the deep peak regulation of the unit and thermoelectric decoupling.

[0041] The present invention combines the zero-output technology of the low-pressure cylinder 2 with the steam accumulator 6, realizes the flexibility of the unit during deep peak regulation, realizes peak shaving and valley filling of energy, avoids the problem of strong coupling between the electric power and thermal power of the cogeneration unit, and promotes the realization of the three reforms of coal-to-electricity.

[0042] Furthermore, the intermediate pressure cylinder 1 is also connected to the cooling steam source 201, and the exhaust temperature and exhaust pressure of the intermediate pressure cylinder 1 are also reduced by cooling steam, thereby improving the thermal cycle efficiency.

[0043] Specifically, the heat recovery heating mechanism 7 includes a first heat exchanger 71, a second heat exchanger 72, and a heat network return water component 73; the first heat exchanger 71 is connected to the output end of the steam accumulator 6, the second heat exchanger 72 is connected to the output end of the intermediate pressure cylinder 1, and the heat network return water component 73 is connected to the first heat exchanger 71 and the second heat exchanger 72 respectively.

[0044] The condensate pump 5 outputs the condensate to the heat network return water component 73. The first heat exchanger 71 uses the heat source provided by the steam accumulator 6 to perform heat exchange on the condensate in the heat network return water component 73. The second heat exchanger 72 uses the exhaust steam provided by the medium pressure cylinder 1 to perform heat exchange on the condensate in the heat network return water component 73. In this way, the heated hot water is provided to the heat user side.

[0045] More specifically, the heat network return water component 73 includes a heat network return water end 731, a heat network supply water end 732, and a heat exchange pipeline 733. The heat exchange pipeline 733 is respectively connected to the first heat exchanger 71 and the second heat exchanger 72. The heat network return water end 731 and the heat network supply water end 732 are respectively arranged at the input end and the output end of the heat exchange pipeline 733.

[0046] It should be noted that the heat network return water end 731 and the condensate pump 5 are used to input condensate, and the heat network supply water end 732 is used to provide heated hot water to the heat user side.

[0047] Of course, in some embodiments, the heat network return water end 731 can also be connected to other water supply ends to obtain heating water.

[0048] More specifically, a first electrically-controlled valve 8 is arranged on the heat exchange pipeline 733 between the heat network return water end 731 and the first heat exchanger 71, and a second electrically-controlled valve 9 is arranged between the heat network return water end 731 and the second heat exchanger 72; a third electrically-controlled valve 10 is arranged on the heat exchange pipeline 733 between the heat network supply water end 732 and the first heat exchanger 71, and a fourth electrically-controlled valve 11 is arranged between the heat network supply water end 732 and the second heat exchanger 72.

[0049] Through the opening and closing states of the first electrically controlled valve 8, the second electrically controlled valve 9, the third electrically controlled valve 10, and the fourth electrically controlled valve 11, the corresponding pipelines can be connected or closed, so that when any failure of the first heat exchanger 71 or the second heat exchanger 72 occurs, only one side of the heat exchange can be used for heating.

[0050] More specifically, a fifth electrically controlled valve 12 is provided between the steam accumulator 6 and the first heat exchanger 71 , and a sixth electrically controlled valve 13 is provided between the intermediate pressure cylinder 1 and the second heat exchanger 72 .

[0051] The fifth electrically controlled valve 12 and the sixth electrically controlled valve 13 can respectively realize the corresponding pipeline connection or closing state, so that when any failure of the steam accumulator 6 and the intermediate pressure cylinder 1 occurs, the heat source supply on the failed side can be closed and only the heat source supply on the normal side can be opened.

[0052] More specifically, the output end of the intermediate pressure cylinder 1 is respectively connected to the condensate pump 5, the steam accumulator 6, and the heat recovery heating mechanism 7 through the first pipeline 102; a seventh electrically controlled valve 14 is arranged between the output end of the intermediate pressure cylinder 1 and the first pipeline 102, an eighth electrically controlled valve 15 is arranged on the first pipeline 102 between the intermediate pressure cylinder 1 and the steam accumulator 6, and a ninth electrically controlled valve 16 is arranged between the intermediate pressure cylinder 1 and the condensate pump 5.

[0053] The seventh electrically controlled valve 14, the eighth electrically controlled valve 15 and the ninth electrically controlled valve 16 can respectively realize the corresponding pipeline connection or closing state, so that when any failure of the steam accumulator 6 and the intermediate pressure cylinder 1 occurs, the heat source supply on the failed side can be closed and only the heat source supply on the normal side can be opened.

[0054] If the intermediate pressure cylinder 1 fails, the seventh electrically controlled valve 14 can be closed to disconnect the connection between the condensate pump 5 , the steam accumulator 6 , and the heat recovery heating mechanism 7 .

[0055] More specifically, a tenth electrically controlled valve 17 is provided between the intermediate pressure cylinder 1 and the turbine reheating hot section 101 ; an eleventh electrically controlled valve 18 is provided between the low pressure cylinder 2 and the condenser 4 .

[0056] The corresponding pipelines can be connected or closed respectively through the tenth electrically controlled valve 17 and the eleventh electrically controlled valve 18.

[0057] More specifically, the cooling steam source 201 is connected to the intermediate pressure cylinder 1 and the low pressure cylinder 2 respectively through the second pipeline 2011 .

[0058] A twelfth electrically controlled valve 19 is provided on the second pipeline 2011 between the cooling steam source 201 and the medium-pressure cylinder 1 , and a thirteenth electrically controlled valve 20 is provided between the cooling steam source 201 and the low-pressure cylinder 2 .

[0059] The twelfth electrically controlled valve 19 and the thirteenth electrically controlled valve 20 can respectively realize the corresponding pipeline connection or closing state. That is to say, the state of the introduction of cooling steam into the medium-pressure cylinder 1 can be controlled by the twelfth electrically controlled valve 19, and the state of the introduction of cooling steam into the low-pressure cylinder 2 can be controlled by the thirteenth electrically controlled valve 20.

[0060] From the above, it can be seen that based on this embodiment, the device is used as follows:

[0061] The intermediate pressure cylinder 1 is connected to the turbine reheat hot section 101, and receives steam from the turbine reheat hot section. The steam further expands and reduces pressure in the intermediate pressure cylinder, and its thermal energy is converted into mechanical energy.

[0062] The steam after work is transported to the low-pressure cylinder 2, the steam accumulator 6 and the heat recovery heating mechanism 7 through the output end of the intermediate-pressure cylinder 1.

[0063] The low-pressure cylinder 2 is connected to the output end of the medium-pressure cylinder 1, receives the steam after the medium-pressure cylinder 1 has done work, and continues to expand and reduce the pressure, converting the remaining thermal energy into mechanical energy.

[0064] At the same time, the cooling steam source 201 introduces cooling steam into the low-pressure cylinder 2 through the second pipeline 2011, reducing the temperature and pressure in the low-pressure cylinder 2, thereby reducing the output power of the low-pressure cylinder 2 and achieving the purpose of reducing the overall output of the unit.

[0065] The generator 3 is connected to the output end of the medium-pressure cylinder 1 and / or the low-pressure cylinder 2 to convert the mechanical energy of the medium-pressure cylinder 1 and / or the low-pressure cylinder 2 into electrical energy.

[0066] The condenser 4 is connected to the output end of the low-pressure cylinder 2 to reduce the exhaust temperature and exhaust pressure of the low-pressure cylinder 2 and improve the thermal cycle efficiency; at the same time, the exhaust steam is condensed into water and transported to the condensate pump 5.

[0067] The condensate pump 5 is connected to the output end of the condenser 4 and the output end of the intermediate pressure cylinder 1. Although the steam of the intermediate pressure cylinder 2 does not directly enter the condensate pump 5, it may be indirectly connected through other pipelines or equipment to provide a heat source or perform other heat exchanges. The condensate pump 5 extracts the condensate in the condenser 4 and sends it to the heat recovery heating mechanism 7 or other water points.

[0068] The steam accumulator 6 is connected to the output end of the intermediate pressure cylinder 1 and is used to store exhaust steam of the intermediate pressure cylinder 1. When necessary, the steam accumulator 6 can release part of the heat to provide a heat source for the heat recovery heating mechanism 7.

[0069] The first heat exchanger 71 in the heat recovery heating mechanism 7 uses the heat source provided by the steam accumulator 6 to perform heat exchange on the condensed water in the heat network return water component 73. The second heat exchanger 72 uses the exhaust steam provided by the intermediate pressure cylinder 1 to perform heat exchange on the condensed water in the heat network return water component 73, and the heated hot water is provided to the heat user side through the heat network water supply end 732.

[0070] The present invention is provided with a plurality of electric control valves for controlling the connection or closing state of each pipeline. When a fault occurs, the electric control valve on the fault side can be closed and only the electric control valve on the normal side can be opened to achieve fault response and energy regulation.

[0071] See also Figure 2 When the unit is operated in the cylinder cutting condition, the power generation and heating supply of the unit in the present invention are linearly related. At this time, the online power consumption of the unit can be reduced, but there is a strong thermal-electric coupling situation.

[0072] See also Figure 3The present invention realizes the thermal-electric decoupling of the unit through the steam accumulator, and the regulating ability of the unit is significantly enhanced. During the period of deep peak regulation by cutting the cylinder, the unit still has a strong regulating ability, thereby improving the flexibility of the cogeneration unit.

[0073] The present invention realizes the flexibility of the unit during deep peak regulation, realizes energy peak shaving and valley filling, avoids the problem of strong coupling between electric power and thermal power of the cogeneration unit, and promotes the implementation of the three reforms of coal-fired power.

[0074] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A low-pressure cylinder zero-output coupled steam accumulator, characterized in that: include: The intermediate pressure cylinder (1) is connected to the reheating hot section (101) of the steam turbine; The low-pressure cylinder (2) is connected to the output end of the medium-pressure cylinder (1) and is also connected to a cooling steam source (201); A generator (3) connected to the output end of the medium-pressure cylinder (1) and / or the low-pressure cylinder (2) to generate electrical energy; A condenser (4) connected to the output end of the low-pressure cylinder (2); A condensate pump (5) connected to the output end of the condenser (4) and also connected to the output end of the medium-pressure cylinder (1); A steam accumulator (6) connected to the output end of the intermediate pressure cylinder (2); The heat recovery heating mechanism (7) is respectively connected to the steam heat accumulator (6) and the output end of the medium pressure cylinder (1), and is also connected to the input end of the condensate pump (5).

2. The low-pressure cylinder zero-output coupled steam accumulator according to claim 1, characterized in that: The intermediate pressure cylinder (1) is also connected to the cooling steam source (201).

3. The low-pressure cylinder zero-output coupled steam accumulator according to claim 1, characterized in that: The heat recovery heating mechanism (7) comprises a first heat exchanger (71), a second heat exchanger (72), and a heat network return water assembly (73); the first heat exchanger (71) is connected to the output end of the steam accumulator (6), the second heat exchanger (72) is connected to the output end of the intermediate pressure cylinder (1), and the heat network return water assembly (73) is respectively connected to the first heat exchanger (71) and the second heat exchanger (72).

4. The low-pressure cylinder zero-output coupled steam accumulator according to claim 3, characterized in that: The heat network return water component (73) comprises a heat network return water end (731), a heat network supply water end (732), and a heat exchange pipeline (733); the heat exchange pipeline (733) is connected to the first heat exchanger (71) and the second heat exchanger (72), respectively; the heat network return water end (731) and the heat network supply water end (732) are respectively arranged at the input end and the output end of the heat exchange pipeline (733).

5. The low-pressure cylinder zero-output coupled steam accumulator according to claim 4, characterized in that: A first electrically controlled valve (8) is arranged on the heat exchange pipeline (733) between the return water end (731) of the heating network and the first heat exchanger (71), and a second electrically controlled valve (9) is arranged between the return water end (731) of the heating network and the second heat exchanger (72); a third electrically controlled valve (10) is arranged on the heat exchange pipeline (733) between the supply water end (732) of the heating network and the first heat exchanger (71), and a fourth electrically controlled valve (11) is arranged between the supply water end (732) of the heating network and the second heat exchanger (72).

6. The low-pressure cylinder zero-output coupled steam accumulator according to claim 5, characterized in that: A fifth electrically controlled valve (12) is provided between the steam accumulator (6) and the first heat exchanger (71), and a sixth electrically controlled valve (13) is provided between the intermediate pressure cylinder (1) and the second heat exchanger (72).

7. The low-pressure cylinder zero-output coupled steam accumulator according to claim 1, characterized in that: The output end of the intermediate pressure cylinder (1) is connected to the condensate pump (5), the steam accumulator (6), and the heat recovery heating mechanism (7) respectively through the first pipeline 102; a seventh electrically controlled valve (14) is arranged between the output end of the intermediate pressure cylinder (1) and the first pipeline (102), an eighth electrically controlled valve (15) is arranged on the first pipeline (102) between the intermediate pressure cylinder (1) and the steam accumulator (6), and a ninth electrically controlled valve (16) is arranged between the intermediate pressure cylinder (1) and the condensate pump (5).

8. The low-pressure cylinder zero-output coupled steam accumulator according to claim 1, characterized in that: A tenth electrically controlled valve (17) is provided between the intermediate pressure cylinder (1) and the turbine reheating hot section (101); and an eleventh electrically controlled valve (18) is provided between the low pressure cylinder (2) and the condenser (4).

9. The low-pressure cylinder zero-output coupled steam accumulator according to claim 1, characterized in that: The cooling steam source (201) is connected to the medium-pressure cylinder (1) and the low-pressure cylinder (2) respectively via a second pipeline (2011).

10. The low-pressure cylinder zero-output coupled steam accumulator according to claim 9, characterized in that: A twelfth electrically controlled valve (19) is provided on the second pipeline (2011) between the cooling steam source (201) and the medium-pressure cylinder (1), and a thirteenth electrically controlled valve (20) is provided between the cooling steam source (201) and the low-pressure cylinder (2).

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