Optical-coal complementary steam turbine system and power generation system with multi-stage energy utilization

Abstract

An embodiment of the present invention provides a solar-thermal and coal complementary steam turbine system and a power generation system with multi-level energy utilization. The solar-thermal and coal complementary steam turbine system with multi-level energy utilization includes a solar-thermal system, a first heat exchanger, a second heat exchanger, a steam generation device, and a steam turbine. The first heat exchanger has a first heat absorption side inlet, a first heat absorption side outlet, a first heat release side inlet, and a first heat release side outlet. The first heat release side inlet is connected to the solar-thermal system. The steam generation device has a first water inlet and a first steam outlet. The steam turbine includes a high-pressure cylinder and an intermediate-pressure cylinder. The high-pressure cylinder has a high-pressure steam inlet and a high-pressure steam outlet. The high-pressure steam inlet is connected to the first steam outlet, and the high-pressure steam outlet is connected to the first heat absorption side inlet. The intermediate-pressure cylinder has an intermediate-pressure steam inlet and an intermediate-pressure steam outlet. The intermediate-pressure steam inlet is connected to the first heat absorption side outlet. The solar-thermal and coal complementary steam turbine system with multi-level energy utilization in the embodiment of the present invention has the advantages of low usage cost, low energy consumption, and environmental protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbine power generation, and particularly relates to a solar-thermal and coal complementary steam turbine system and a power generation system with multi-stage energy utilization. Background Art

[0002] A steam turbine is a rotary steam power device and is one of the main equipment for modern thermal power generation. The steam turbine power generation system in related technologies uses the steam turbine to do work and then drives the generator to generate electricity. The steam turbine power generation system usually uses coal as fuel for power generation, resulting in more pollutant emissions and higher power generation costs of the steam turbine power generation system. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in related technologies to some extent.

[0004] To this end, an embodiment of the present invention provides a solar-thermal and coal complementary steam turbine system with multi-stage energy utilization, which has the advantages of low use cost, low energy consumption and environmental protection.

[0005] The solar-thermal and coal complementary steam turbine system with multi-stage energy utilization provided by the embodiment of the present invention includes a solar-thermal system, a first heat exchanger, a second heat exchanger, a steam generating device and a steam turbine.

[0006] The solar-thermal system has a first medium inlet and a first medium outlet;

[0007] The first heat exchanger has a first heat absorption side inlet, a first heat absorption side outlet, a first heat release side inlet and a first heat release side outlet. The first heat release side inlet is connected to the first medium outlet.

[0008] The second heat exchanger has a second air inlet, a second air outlet, a second heat release side inlet and a second heat release side outlet. The second heat release side outlet is connected to the first medium inlet, and the second heat release side inlet is connected to the first heat release side outlet;

[0009] The steam generating device has a first water inlet and a first steam outlet;

[0010] The steam turbine includes a high-pressure cylinder and an intermediate-pressure cylinder. The high-pressure cylinder has a high-pressure steam inlet and a high-pressure steam outlet. The high-pressure steam inlet is connected to the first steam outlet, and the high-pressure steam outlet is connected to the first heat absorption side inlet;

[0011] The intermediate-pressure cylinder has an intermediate-pressure steam inlet and an intermediate-pressure steam outlet. The intermediate-pressure steam inlet is connected to the first heat absorption side outlet.

[0012] Compared with the related technologies, the solar-thermal and coal complementary steam turbine system with multi-level energy utilization according to the embodiments of the present invention, on the one hand, uses the solar-thermal system to replace the steam generating device to heat the cold reheat steam, greatly reducing the fuel consumed by the steam generating device; on the other hand, the solar-thermal system is used to heat the air entering the second heat exchanger, and the heated air can be used for drying pulverized coal, primary air of the boiler and secondary air of the boiler, thereby realizing the multi-purpose utilization of solar energy.

[0013] Therefore, the solar-thermal and coal complementary steam turbine system with multi-level energy utilization according to the embodiments of the present invention, on the one hand, reduces the fuel consumption of the steam generating device, saves costs, and reduces the emissions of pollutants generated by burning fuel; on the other hand, it realizes the multi-purpose utilization of solar energy.

[0014] In some embodiments, the solar-thermal and coal complementary steam turbine system with multi-level energy utilization according to the embodiments of the present invention further includes:

[0015] A first pipeline, one end of the first pipeline is connected to the first medium outlet, and the other end of the first pipeline is connected to the first heat release side inlet;

[0016] A second pipeline, one end of the second pipeline is connected to the first medium inlet, and the other end of the second pipeline is connected to the second heat release side outlet;

[0017] A third pipeline, one end of the third pipeline is connected to the first heat release side outlet, and the other end of the third pipeline is connected to the second heat release side inlet.

[0018] In some embodiments, the solar-thermal and coal complementary steam turbine system with multi-level energy utilization according to the embodiments of the present invention further includes an energy storage system, and the energy storage system includes:

[0019] A third heat exchanger, the third heat exchanger has a first heat exchange channel and a second heat exchange channel, the first heat exchange channel has a first heat exchange inlet and outlet and a second heat exchange inlet and outlet, the second heat exchange channel has a third heat exchange inlet and outlet and a fourth heat exchange inlet and outlet, the first heat exchange inlet and outlet is connected to the first pipeline, and the second heat exchange inlet and outlet is connected to the second pipeline;

[0020] A first medium tank, the first medium tank has a first medium inlet and outlet, and the first medium inlet and outlet is connected to the third heat exchange inlet and outlet;

[0021] A second medium tank, the second medium tank has a second medium inlet and outlet, and the second medium inlet and outlet is connected to the fourth heat exchange inlet and outlet.

[0022] In some embodiments, the light-coal complementary steam turbine system with multi-stage energy utilization according to the embodiments of the present invention further includes a regenerative system and a fourth heat exchanger. The fourth heat exchanger has a fourth heat release side inlet, a fourth heat release side outlet, a fourth heat absorption side inlet, and a fourth heat absorption side outlet. The fourth heat release side inlet is connected to the third pipeline, and the fourth heat release side outlet is connected to the second pipeline;

[0023] The regenerative system includes a high-pressure heater system. The high-pressure heater system has a first high-pressure heater channel. One end of the first high-pressure heater channel is connected to the intermediate-pressure cylinder, and the other end of the first high-pressure heater channel is connected to the first water inlet. The first high-pressure heater channel has a first inlet and a first outlet. The first inlet is connected to the fourth heat absorption side outlet, and the first outlet is connected to the fourth heat absorption side outlet.

[0024] In some embodiments, the light-coal complementary steam turbine system with multi-stage energy utilization according to the embodiments of the present invention further includes a low-pressure cylinder. The low-pressure cylinder has a low-pressure steam inlet and a low-pressure steam outlet. The intermediate-pressure steam outlet is connected to the low-pressure steam inlet.

[0025] In some embodiments, the light-coal complementary steam turbine system with multi-stage energy utilization according to the embodiments of the present invention further includes a condensing device and a deaerator. The condensing device has a first condensation inlet and a first condensation outlet. The deaerator has a first deaeration inlet and a first deaeration outlet. The first condensation inlet is connected to the low-pressure steam outlet, the first condensation outlet is connected to the first deaeration inlet, and the first deaeration outlet is connected to the first water inlet;

[0026] The deaerator further has a second deaeration inlet, and the second deaeration inlet is connected to the intermediate-pressure cylinder.

[0027] In some embodiments, the regenerative system further includes a low-pressure heater system,

[0028] One end of the first high-pressure heater channel is connected to the first deaeration outlet, and the other end of the first high-pressure heater channel is connected to the first water inlet;

[0029] The high-pressure heater system further has a second high-pressure heater channel. One end of the second high-pressure heater channel is connected to the first deaeration outlet, and the other end of the second high-pressure heater channel is connected to at least one of the high-pressure cylinder and the intermediate-pressure cylinder;

[0030] The low-pressure heater system has a first low-pressure heater channel. One end of the first low-pressure heater channel is connected to the first condensation outlet, and the other end of the first low-pressure heater channel is connected to the first deaeration inlet;

[0031] The condensing device further has a second condensing inlet, and the low-pressure heater system further has a second low-pressure heater passage. One end of the second low-pressure heater passage is connected to the second condensing inlet, and the other end of the second low-pressure heater passage is connected to the low-pressure cylinder.

[0032] In some embodiments, the high-pressure heater system includes:

[0033] A first high-pressure heater device having a first high-pressure heater pipeline, one end of the first high-pressure heater pipeline being connected to the first deaeration outlet;

[0034] A second high-pressure heater device having a second high-pressure heater pipeline, one end of the second high-pressure heater pipeline being connected to the other end of the first high-pressure heater pipeline;

[0035] A third high-pressure heater device having a third high-pressure heater pipeline, one end of the third high-pressure heater pipeline being connected to the other end of the second high-pressure heater pipeline, the other end of the third high-pressure heater pipeline being connected to the first water inlet, and the chambers of the first high-pressure heater pipeline, the second high-pressure heater pipeline, and the third high-pressure heater pipeline being sequentially communicated to form the first high-pressure heater passage;

[0036] The deaerator further has a second deaeration inlet, and the first high-pressure heater device further has a first high-pressure heater steam inlet and a first high-pressure heater steam outlet. The first high-pressure heater steam outlet is connected to the second deaeration inlet.

[0037] The second high-pressure heater device further has a second high-pressure heater steam inlet and a second high-pressure heater steam outlet. The second high-pressure heater steam outlet is connected to the first high-pressure heater steam inlet.

[0038] The third high-pressure heater device further has a third high-pressure heater steam inlet and a third high-pressure heater steam outlet. The third high-pressure heater steam outlet is connected to the second high-pressure heater steam inlet, and the third high-pressure heater steam inlet is connected to one of the high-pressure cylinder and the intermediate-pressure cylinder.

[0039] The second high-pressure heater device further has a fourth high-pressure heater steam inlet, and the fourth high-pressure heater steam inlet is connected to one of the high-pressure cylinder and the intermediate-pressure cylinder.

[0040] The first high-pressure heater device further has a fifth high-pressure heater steam inlet, and the fifth high-pressure heater steam inlet is connected to one of the high-pressure cylinder and the intermediate-pressure cylinder.

[0041] In some embodiments, the low-pressure heater system includes:

[0042] A first low-pressure heater device having a first low-pressure heater pipeline, one end of the first low-pressure heater pipeline being connected to the first condensing outlet;

[0043] The second low-pressure heater device, the second low-pressure heater device having a second low-pressure heater pipeline, one end of the second low-pressure heater pipeline being connected to the other end of the first low-pressure heater pipeline;

[0044] The third low-pressure heater device, the third low-pressure heater device having a third low-pressure heater pipeline, one end of the third low-pressure heater pipeline being connected to the other end of the second low-pressure heater pipeline;

[0045] The fourth low-pressure heater device, the fourth low-pressure heater device having a fourth low-pressure heater pipeline, one end of the fourth low-pressure heater pipeline being connected to the other end of the third low-pressure heater pipeline, the other end of the fourth low-pressure heater pipeline being connected to the first deaeration inlet; the chambers of the first low-pressure heater pipeline, the second low-pressure heater pipeline, the third low-pressure heater pipeline, and the fourth low-pressure heater pipeline are sequentially communicated to form the first low-pressure heater channel.

[0046] The first low-pressure heater device further has a first low-pressure heater steam inlet and a first low-pressure heater steam outlet, the first low-pressure heater steam outlet being connected to the second condensation inlet.

[0047] The second low-pressure heater device further has a second low-pressure heater steam inlet and a second low-pressure heater steam outlet, the second low-pressure heater steam outlet being connected to the first low-pressure heater steam inlet.

[0048] The third low-pressure heater device further has a third low-pressure heater steam inlet and a third low-pressure heater steam outlet, the third low-pressure heater steam outlet being connected to the second low-pressure heater steam inlet.

[0049] The fourth low-pressure heater device further has a fourth low-pressure heater steam inlet and a fourth low-pressure heater steam outlet, the fourth low-pressure heater steam outlet being connected to the third low-pressure heater steam inlet, and the fourth low-pressure heater steam inlet being connected to the low-pressure cylinder.

[0050] The third low-pressure heater device further has a fifth low-pressure heater steam inlet, the fifth low-pressure heater steam inlet being connected to the low-pressure cylinder.

[0051] The second low-pressure heater device further has a sixth low-pressure heater steam inlet, the sixth low-pressure heater steam inlet being connected to the low-pressure cylinder.

[0052] The first low-pressure heater device further has a seventh low-pressure heater steam inlet, the seventh low-pressure heater steam inlet being connected to the low-pressure cylinder.

[0053] The embodiment of the present invention further provides a power generation system, the power generation system including a generator and the steam turbine system according to any one of the above embodiments. By setting the optical coal complementary steam turbine system of the above embodiment, the power generation system of the embodiment of the present invention greatly reduces the fuel amount required by the steam generating device, which not only saves the power generation cost but also reduces the emission amount of pollutants generated by power generation.

[0054] Therefore, the power generation system according to the embodiments of the present invention has the advantages of low use cost, low energy consumption, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 FIG. 1 is a schematic structural diagram of a solar-thermal and coal-complementary steam turbine system for multi-stage energy utilization according to an embodiment of the present invention;

[0056] Figure 2 FIG. Figure 1 2 is a partial enlarged view of part A in FIG. 1;

[0057] Figure 3 FIG. 3 is a schematic structural diagram of a steam generating device in a solar-thermal and coal-complementary steam turbine system for multi-stage energy utilization according to an embodiment of the present invention.

[0058] Reference Numerals:

[0059] 100, solar-thermal and coal-complementary steam turbine system for multi-stage energy utilization; 200, generator.

[0060] 1, solar-thermal system; 101, first medium inlet; 102, first medium outlet; 103, heat storage tank; 104, body; 1041, mirror field; 1042, tower body;

[0061] 2, first heat exchanger; 201, first heat absorption side inlet; 202, first heat absorption side outlet; 203, first heat release side inlet; 204, first heat release side outlet;

[0062] 3, steam generating device; 31, first water inlet; 32, first steam outlet; 33, steam generator; 331, economizer; 332, water wall; 333, steam-water separator; 334, horizontal low-temperature superheater; 3341, third steam outlet; 3342, fourth steam outlet; 34, first steam heater; 341, vertical low-temperature superheater; 3411, first heating inlet; 342, platen superheater; 343, final superheater; 3431, first heating outlet; 35, second steam heater; 351, horizontal low-temperature reheater; 3511, second heating inlet; 352, vertical low-temperature reheater; 353, final reheater; 3531, second heating outlet;

[0063] 4, steam turbine; 401, high-pressure cylinder; 4011, high-pressure steam inlet; 4012, high-pressure steam outlet; 402, intermediate-pressure cylinder; 4021, intermediate-pressure steam inlet; 4022, intermediate-pressure steam outlet; 403, low-pressure cylinder; 4031, low-pressure steam inlet; 4032, low-pressure steam outlet;

[0064] 5, second heat exchanger; 501, second air inlet; 502, second air outlet; 503, second heat release side inlet; 504, second heat release side outlet;

[0065] 61. First pipeline; 62. Second pipeline; 63. Third pipeline;

[0066] 64. Fourth heat exchanger; 641. Fourth heat release side inlet; 642. Fourth heat release side outlet; 643. Fourth heat absorption side inlet; 644. Fourth heat absorption side outlet;

[0067] 7. Energy storage system;

[0068] 701. Third heat exchanger; 7011. First heat exchange channel; 70111. First heat exchange inlet and outlet; 70112. Second heat exchange inlet and outlet; 7012. Second heat exchange channel; 70121. Third heat exchange inlet and outlet; 70122. Fourth heat exchange inlet and outlet; 702. First medium tank; 7021. First medium inlet and outlet; 703. Second medium tank; 7031. Second medium inlet and outlet;

[0069] 8. Condensing device; 801. First condensing inlet; 802. Second condensing inlet; 803. First condensing outlet;

[0070] 9. Regenerative system;

[0071] 901. High pressure heater system;

[0072] 9011. First high pressure heater channel; 90111. First inlet; 90112. First outlet; 9012. Second high pressure heater channel;

[0073] 9013. First high pressure heater device; 90131. First high pressure heater pipeline; 90132. First high pressure heater steam inlet; 90133. First high pressure heater steam outlet; 90134. Fifth high pressure heater steam inlet;

[0074] 9014. Second high pressure heater device; 90141. Second high pressure heater pipeline; 90142. Second high pressure heater steam inlet; 90143. Second high pressure heater steam outlet; 90144. Fourth high pressure heater steam inlet;

[0075] 9015. Third high pressure heater device; 90151. Third high pressure heater pipeline; 90152. Third high pressure heater steam inlet; 90153. Third high pressure heater steam outlet;

[0076] 902. Low pressure heater system;

[0077] 9021. First low pressure heater channel; 9022. Second low pressure heater channel;

[0078] 9023. First low pressure heater device; 90231. First low pressure heater pipeline; 90232. First low pressure heater steam inlet; 90233. First low pressure heater steam outlet; 90234. Seventh low pressure heater steam inlet;

[0079] 9024. Second low-pressure heater device; 90241. Second low-pressure heater pipeline; 90242. Second low-pressure heater steam inlet; 90243. Second low-pressure heater steam outlet; 90244. Sixth low-pressure heater steam inlet;

[0080] 9025. Third low-pressure heater device; 90251. Third low-pressure heater pipeline; 90252. Third low-pressure heater steam inlet; 90253. Third low-pressure heater steam outlet; 90254. Fifth low-pressure heater steam inlet;

[0081] 9026. Fourth low-pressure heater device; 90261. Fourth low-pressure heater pipeline; 90262. Fourth low-pressure heater steam inlet; 90263. Fourth low-pressure heater steam outlet;

[0082] 903. Deaerator; 9031. First deaeration inlet; 9032. Second deaeration inlet; 9034. First deaeration outlet. Detailed implementation manner

[0083] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0084] Below refer to the attached Figures 1-3 Describe the optical coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiments of the present invention.

[0085] As Figures 1-3 As shown, the optical coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiments of the present invention includes a solar thermal system 1, a first heat exchanger 2, a second heat exchanger 5, a steam generating device 3 and a steam turbine 4.

[0086] The solar thermal system 1 is used to convert solar energy into heat energy. The solar thermal system 1 has a first medium inlet 101 and a first medium outlet 102.

[0087] The first heat exchanger 2 has a first heat absorption side inlet 201, a first heat absorption side outlet 202, a first heat release side inlet 203 and a first heat release side outlet 204. The first heat release side inlet 203 is connected to the first medium outlet 102;

[0088] The second heat exchanger 5 has a second air inlet 501, a second air outlet 502, a second heat release side inlet 503 and a second heat release side outlet 504. The second heat release side outlet 504 is connected to the first medium inlet 101, and the second heat release side inlet 503 is connected to the first heat release side outlet 204;

[0089] The steam generating device 3 is used to evaporate liquid water into steam. The steam generating device 3 has a first water inlet 31 and a first steam outlet 32.

[0090] The steam turbine 4 includes a high-pressure cylinder 401 and an intermediate-pressure cylinder 402. The high-pressure cylinder 401 has a high-pressure steam inlet 4011 and a high-pressure steam outlet 4012. The high-pressure steam inlet 4011 is connected to the first steam outlet 32, and the high-pressure steam outlet 4012 is connected to the first heat absorption side inlet 201.

[0091] The intermediate-pressure cylinder 402 has an intermediate-pressure steam inlet 4021 and an intermediate-pressure steam outlet 4022. The intermediate-pressure steam inlet 4021 is connected to the first heat absorption side outlet 202.

[0092] The following refers to the attached Figures 1-3 Describe the working process of the optical coal complementary steam turbine system 100 with multi-stage energy utilization according to the embodiments of the present invention.

[0093] As shown in the figure, water enters the steam generating device 3 through the first water inlet 31 and is processed to form high-temperature and high-pressure main steam. After the main steam is discharged from the steam generating device 3 through the first steam outlet 32, the main steam enters the high-pressure cylinder 401 of the steam turbine 4 through the high-pressure steam inlet to do work. After the first steam does work in the high-pressure cavity, it forms cold reheat steam and is discharged from the high-pressure steam outlet 4012; the cold reheat steam discharged from the high-pressure steam outlet 4012 enters the first heat exchanger 2 through the first heat absorption side inlet 201 of the first heat exchanger 2, so that the cold reheat steam exchanges heat with the medium heated by the solar thermal system 1 and is heated to form hot reheat steam. The hot reheat steam is discharged through the first heat absorption side outlet 202 and enters the intermediate-pressure cylinder 402 through the intermediate-pressure steam inlet 4021 to do work.

[0094] Air enters the second heat exchanger 5 through the second air inlet 501 for heat exchange and temperature rise. After the heated air is discharged from the second air outlet 502, it can be used for drying pulverized coal, primary air for the boiler, and secondary air for the boiler.

[0095] Among them, the medium heated by the solar thermal system 1 is discharged from the first medium outlet 102, enters the first heat exchanger 2 through the first heat release side inlet to exchange heat with the cold reheat steam, and the exchanged medium is discharged from the first heat release side outlet 204 and then enters the second heat exchanger 5 through the second heat release side inlet 503 to exchange heat with the air entering the second heat exchanger 5 from the first air inlet, so as to heat the air. After the heated air is discharged from the second air outlet 502, it can be used for drying pulverized coal, primary air for the boiler, and secondary air for the boiler.

[0096] The steam turbine system in the related art includes a boiler and a steam turbine 4, and the steam turbine 4 includes an intermediate pressure cylinder 402 and a high pressure cylinder 401. When the steam turbine system in the related art is operating, water enters the boiler for heating treatment to form high-temperature and high-pressure main steam. After the main steam enters the high pressure cylinder 401 to do work, it forms cold reheat steam. The cold reheat steam needs to enter the boiler again for heating to form hot reheat steam for the intermediate pressure cylinder 402 to do work. That is to say, the boiler not only needs to heat water to form high-temperature and high-pressure main steam, but also needs to heat the cold reheat steam again. Therefore, the boiler consumes more fuel when heating the cold reheat steam and water, resulting in more pollutant emissions and higher operating costs in the steam turbine system in the related art.

[0097] Compared with the related art, the steam turbine system of the embodiment of the present invention uses the solar thermal system 1 to replace the steam generating device 3 to heat the cold reheat steam, reducing the heat of the fuel consumed by the steam generating device 3 and reducing the fuel consumed by the steam generating device 3. At the same time, the solar thermal system 1 is used to heat the air. After the heated air is discharged from the second air outlet 502, it can be used to dry pulverized coal, the primary air of the boiler, and the secondary air of the boiler, realizing the multi-purpose utilization of solar energy.

[0098] Thus, the solar-thermal and coal complementary steam turbine system 100 of the embodiment of the present invention can achieve a high degree of complementarity between tower-type solar thermal energy and thermal power unit systems, greatly reducing carbon emissions. Taking a conventional 660MW unit (CLN600-24.2 / 566 / 566, once-through reheat, the reheat steam flow rate is 1422.38t / h under THA conditions) as an example for calculation, it can save 862.1GJ / h of boiler heat consumption. Calculated according to a boiler thermal efficiency of 0.925, it is equivalent to saving 31.87t / h of standard coal, and saving 279,184.3 tons of coal throughout the year. The annual reduction of carbon dioxide emissions is 7,314,628.1 tons, the annual reduction of sulfur dioxide emissions is 2,373.1 tons, and the annual nitrogen oxide emissions are 2,065.9 tons.

[0099] Thus, the solar-thermal and coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiment of the present invention has the advantages of low operating cost, low energy consumption, and environmental protection.

[0100] The following further describes the solar-thermal and coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiment of the present invention. Figures 1-3

[0101] Figures 1-3 As shown, the solar-thermal and coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiment of the present invention includes a solar thermal system 1, a first heat exchanger 2, a second heat exchanger 5, a steam generating device 3, and a steam turbine 4.

[0102] The solar thermal system 1 includes a main body 104 and a heat storage tank 103. The main body 104 includes a mirror field 1041 and a tower body 1042. The heat storage tank 103 is provided at the upper end of the tower body 1042. The heat storage tank 103 has a first medium inlet 101 and a first medium outlet 102. The mirror field 1041 reflects sunlight onto the heat storage tank 103. The heat storage tank 103 absorbs the heat of the sunlight, thereby heating the medium located inside the heat storage tank 103 and increasing the temperature of the medium in the heat storage tank 103, thus achieving the effect of storing solar energy.

[0103] Optionally, the medium inside the heat storage tank 103 can be a substance capable of storing energy, such as molten salt, water, etc.

[0104] The first heat exchanger 2 has a first heat absorption side inlet 201, a first heat absorption side outlet 202, a first heat release side inlet 203, and a first heat release side outlet 204. The first heat release side inlet 203 is connected to the first medium outlet 102;

[0105] The second heat exchanger 5 has a second air inlet 501, a second air outlet 502, a second heat release side inlet 503, and a second heat release side outlet 504. The second heat release side outlet 504 is connected to the first medium inlet 101, and the second heat release side inlet 503 is connected to the first heat release side outlet 204;

[0106] The steam generating device 3 has a first water inlet 31 and a first steam outlet 32.

[0107] The steam turbine 4 includes a high-pressure cylinder 401 and an intermediate-pressure cylinder 402. The high-pressure cylinder 401 has a high-pressure steam inlet 4011 and a high-pressure steam outlet 4012. The high-pressure steam inlet 4011 is connected to the first steam outlet 32, and the high-pressure steam outlet 4012 is connected to the first heat absorption side inlet 201;

[0108] The intermediate-pressure cylinder 402 has an intermediate-pressure steam inlet 4021 and an intermediate-pressure steam outlet 4022. The intermediate-pressure steam inlet 4021 is connected to the first heat absorption side outlet 202.

[0109] It should be noted that in order for the first heat exchanger 2 to achieve heat exchange, the first heat exchanger 2 has a first heat absorption side channel and a first heat release side channel. One end of the first heat release side channel is the first heat release side inlet 203, and the other end of the first heat release side channel is the first heat release side outlet 204. One end of the first heat absorption side channel is the first heat absorption side inlet 201, and the other end of the first heat absorption channel is the first heat absorption side outlet 202. The first heat release side channel and the first heat absorption side channel can exchange heat inside the first heat exchanger 2.

[0110] Meanwhile, to enable the second heat exchanger 5 to achieve heat exchange, the second heat exchanger 5 has a second air channel and a second heat release side channel. One end of the second heat release side channel is the second heat release side inlet 503, and the other end of the second heat release side channel is the second heat release side outlet 504. One end of the second air channel is the second air inlet 501, and the other end of the second air channel is the second air outlet 502. The second heat release side channel and the second air channel can exchange heat within the second heat exchanger 5.

[0111] That is to say, the medium in the heat storage tank 103 can be discharged from the first medium outlet 102 and then enter the first heat release side channel of the first heat exchanger 2 through the first heat release side inlet 203. The cold reheat steam discharged from the high-pressure steam outlet 4012 enters the first heat absorption side channel of the first heat exchanger 2 through the first heat absorption side inlet 201. The medium in the first heat release channel exchanges heat with the cold reheat steam in the first heat absorption channel, so that the cold reheat steam is heated to hot reheat steam and then discharged from the first heat absorption side outlet 202 and enters the intermediate pressure cylinder 402 through the intermediate pressure steam inlet 4021 to perform work. The medium in the first heat release channel is discharged from the first heat release side outlet 204 after heat exchange, then enters the first heat exchanger 2 through the first heat release side inlet 203 to exchange heat with the cold reheat steam, and the heat-exchanged medium is discharged from the first heat release side outlet 204 and enters the second heat exchanger 5 through the second heat release side inlet 503 to exchange heat with the air entering the second heat exchanger 5 from the second air inlet 501, heating the air. The heated air is discharged from the second air outlet 502 and can be used for drying pulverized coal, primary air of the boiler, and secondary air of the boiler.

[0112] The medium after heat exchange in the second heat exchanger 5 is discharged from the second heat release side outlet 504 and then enters the solar thermal system 1 through the first medium inlet 101 for reheating.

[0113] Thus, it is realized to use solar energy to heat the cold reheat steam into hot reheat steam, which can reduce the energy consumption required for the steam generating device 3 to generate steam. At the same time, solar energy is used to heat the air, so that the heated air can be used for drying pulverized coal, primary air of the boiler, and secondary air of the boiler, realizing the multiple utilization of solar energy.

[0114] Therefore, the solar-thermal and coal-complementary steam turbine system 100 with multi-stage energy utilization according to the embodiments of the present invention has the advantages of low use cost, low energy consumption, and environmental protection.

[0115] In some embodiments, as Figure 1 shown, the solar-thermal and coal-complementary steam turbine system 100 with multi-stage energy utilization according to the embodiments of the present invention further includes a first pipeline 61 and a second pipeline 62.

[0116] One end of the first pipeline 61 is connected to the first medium outlet 102, and the other end of the first pipeline 61 is connected to the first heat release side inlet 203.

[0117] One end of the second pipeline 62 is connected to the first medium inlet 101, and the other end of the second pipeline 62 is connected to the first heat release side outlet 204.

[0118] One end of the third pipeline 63 is connected to the first heat release side outlet 204, and the other end of the third pipeline 63 is connected to the second heat release side inlet 503.

[0119] The energy storage tank, the first heat exchanger 2 and the second heat exchanger 5 are connected end to end by using the first pipeline 61, the second pipeline 62 and the third pipeline 63, thereby realizing the circulation of the medium among the energy storage tank, the first heat exchanger 2 and the second heat exchanger 5.

[0120] In some embodiments, the optical coal complementary steam turbine system 100 with multi-stage energy utilization according to the embodiment of the present invention further includes an energy storage system 7, and the energy storage system 7 includes a second heat exchanger 5, a first medium tank 702 and a second medium tank 703.

[0121] The third heat exchanger 701 has a first heat exchange channel 7011 and a second heat exchange channel 7012. The first heat exchange channel 7011 has a first heat exchange inlet and outlet 70111 and a second heat exchange inlet and outlet 70112. The second heat exchange channel 7012 has a third heat exchange inlet and outlet 70121 and a fourth heat exchange inlet and outlet 70122. The first heat exchange inlet and outlet 70111 is connected to the first pipeline 61, and the second heat exchange inlet and outlet 70112 is connected to the second pipeline 62. It should be noted that the first heat exchange channel 7011 and the second heat exchange channel 7012 are arranged in the second heat exchanger 5, and heat exchange can be carried out between the first heat exchange channel 7011 and the second heat exchange channel 7012. That is to say, the first heat exchange channel 7011 can transfer heat to the second heat exchange channel 7012, and the second heat exchange channel 7012 can also transfer heat to the first heat exchange channel 7011.

[0122] The first medium tank 702 has a first medium inlet / outlet 7021, and the first medium inlet / outlet 7021 is connected to the third heat exchange inlet / outlet 70121. The second medium tank 703 has a second medium inlet / outlet 7031, and the second medium inlet / outlet 7031 is connected to the fourth heat exchange inlet / outlet 70122. That is to say, the medium in the first medium tank 702 can be discharged through the first medium inlet / outlet 7021 and then enter the second heat exchange channel 7012 through the third heat exchange inlet / outlet 70121. After heat exchange in the second heat exchanger, it is discharged through the fourth heat exchange inlet / outlet 70122 and enters the second medium tank 703 through the second medium inlet / outlet 7031. Of course, the medium in the second medium tank 703 can be discharged through the second medium inlet / outlet 7031 and then enter the second heat exchange channel 7012 through the fourth heat exchange inlet / outlet 70122. After heat exchange in the second heat exchanger, it is discharged through the third heat exchange inlet / outlet 70121 and enters the first medium tank 702 through the first medium inlet / outlet 7021.

[0123] When there is sufficient sunlight, the medium heated by solar energy in the heat storage tank 103 is discharged from the first medium outlet 102. Part of it enters the first heat release side channel through the first heat release side inlet 203. The medium in the first heat release channel exchanges heat with the cold reheat steam in the first heat absorption channel, so that the cold reheat steam is heated to hot reheat steam and then discharged from the first heat absorption side outlet 202 and enters the intermediate pressure cylinder 402 through the intermediate pressure steam inlet 4021 to do work. The medium in the first heat release channel is discharged from the first heat release side outlet 204 after heat exchange and then enters the heat storage tank 103 through the first medium inlet 101.

[0124] The medium that has undergone heat exchange in the first heat exchanger 2 can be discharged from the first heat release side outlet 204 and then enter the second heat release side channel through the second heat release side inlet 503. The medium in the second heat release side channel exchanges heat with the air in the second air channel, so that the temperature of the air in the second air channel is increased, and the heated air is discharged from the second air outlet 502. The medium that has undergone heat exchange in the second heat exchanger 5 is discharged from the second heat release outlet and then enters the solar thermal system 1 through the first medium inlet 101 to be reheated.

[0125] Another part of the medium discharged from the first medium outlet 102 enters the first heat exchange channel 7011 of the third heat exchanger 701 through the first heat exchange inlet / outlet 70111, while the medium in the second medium tank 703 enters the second heat exchange channel 7012 of the second heat exchanger 5 through the fourth heat exchange inlet / outlet 70122 and exchanges heat with the medium in the first heat exchange channel 7011. The medium in the second heat exchange channel 7012 absorbs heat and is discharged from the third heat exchange inlet / outlet 70121 and enters the first medium tank 702 through the first medium inlet / outlet 7021, thereby realizing heat storage of the energy storage system 7.

[0126] When the sunlight is insufficient, the medium in the first medium tank 702 can be discharged through the first medium inlet / outlet 7021 and enter the second heat exchange channel 7012 through the third heat exchange inlet / outlet 70121, and exchange heat with the medium in the first heat exchange channel 7011, thereby heating the medium in the first heat exchange channel 7011. The heated medium in the first heat exchange channel 7011 can be discharged through the first heat exchange inlet / outlet 70111 and then enter the first heat release side channel through the first heat release side inlet 203, and exchange heat with the cold reheat steam in the first heat absorption side channel to heat the cold reheat steam in the first heat absorption side channel into hot reheat steam.

[0127] The medium after heat exchange is discharged from the first heat release side outlet 204 and enters the second heat exchanger 5 through the second heat release side inlet 503 to exchange heat with the air in the second heat absorption channel, raising the temperature of the air. The medium after heat exchange enters the first heat exchange channel 7011 of the third heat exchanger 701 through the second heat exchange inlet / outlet 70112 for reheating. This ensures that the second heat exchanger 5 can continuously and stably heat the air, enabling the solar-thermal complementary steam turbine system 100 with multi-stage energy utilization to operate stably under insufficient sunlight.

[0128] In some embodiments, the solar-thermal complementary steam turbine system 100 with multi-stage energy utilization according to the embodiment of the present invention further includes a regenerative system 9 and a fourth heat exchanger 64. The fourth heat exchanger 64 has a fourth heat release side inlet 641, a fourth heat release side outlet 642, a fourth heat absorption side inlet 643, and a fourth heat absorption side outlet 644. The fourth heat release side inlet 641 is connected to the third pipeline 63, and the fourth heat release side outlet 642 is connected to the second pipeline 62.

[0129] The regenerative system 9 includes a high-pressure heater system 901. The high-pressure heater system 901 has a first high-pressure heater channel 9011. One end of the first high-pressure heater channel 9011 is connected to the intermediate-pressure cylinder 402, and the other end is connected to the first water inlet 31. The first high-pressure heater channel 9011 has a first inlet 90111 and a first outlet 90112. The first inlet 90111 is connected to the fourth heat absorption side outlet 644, and the first outlet 90112 is connected to the fourth heat absorption side outlet 644.

[0130] It should be noted that in order for the fourth heat exchanger 64 to achieve heat exchange, the fourth heat exchanger 64 has a fourth heat absorption side channel and a fourth heat release side channel. One end of the fourth heat release side channel is the fourth heat release side inlet 641, and the other end is the fourth heat release side outlet 642. One end of the fourth heat absorption side channel is the fourth heat absorption side inlet 643, and the other end of the fourth heat absorption channel is the fourth heat absorption side outlet 644. The fourth heat release side channel and the fourth heat absorption side channel can exchange heat within the fourth heat exchanger 64.

[0131] That is to say, after the medium is heat-exchanged in the first heat exchanger 2 and discharged from the first heat release side outlet 204, it can enter the fourth heat exchanger 64 through the fourth heat release side inlet 641 to exchange heat with the liquid water discharged from the first high-pressure heater channel 9011 and enter the fourth heat exchanger 64, so as to increase the temperature of the liquid water. After being heat-exchanged in the fourth heat exchanger 64, the medium can be discharged from the fourth heat release side outlet 642 and then enter the solar thermal system 1 through the first medium inlet 101 for reheating.

[0132] It can be understood that after the medium is heat-exchanged in the first heat exchanger 2 and discharged from the first heat release side outlet 204, a part of it can enter the second heat exchanger 5, and the other part can enter the fourth heat exchanger 64. It can be imagined that the medium heat-exchanged in the first heat exchanger 2 can all enter the second heat exchanger 5 or all enter the fourth heat exchanger 64, which can be specifically set according to needs.

[0133] In some embodiments, as Figure 1 shown, the solar-thermal and coal-complementary steam turbine system 100 with multi-stage energy utilization according to the embodiment of the present invention further includes a low-pressure cylinder 403. The low-pressure cylinder 403 has a low-pressure steam inlet 4031 and a low-pressure steam outlet 4032, and the medium-pressure steam outlet 4022 is connected to the low-pressure steam inlet 4031. That is to say, after the hot reheat steam enters the medium-pressure cylinder 402 through the medium-pressure steam inlet 4021 to do work and is discharged from the medium-pressure steam outlet, it enters the low-pressure cylinder 403 through the low-pressure steam outlet 4032 to do work. It can be understood that passing the steam discharged from the medium-pressure cylinder 402 into the low-pressure cylinder 403 to do work again can, on the one hand, improve the energy utilization rate of the steam, so that the steam generated by the steam generating device 3 can do more work. On the other hand, it makes the temperature of the steam discharged from the steam turbine 4 further decrease, thereby reducing the energy consumption of subsequently condensing the steam into liquid water. Therefore, by setting the low-pressure cylinder 403, the solar-thermal and coal-complementary steam turbine system 100 with multi-stage energy utilization according to the embodiment of the present invention greatly improves the energy utilization rate of the solar-thermal and coal-complementary steam turbine system 100 with multi-stage energy utilization and reduces the energy consumption of the solar-thermal and coal-complementary steam turbine system 100 with multi-stage energy utilization.

[0134] In some embodiments, the optical-coal complementary steam turbine system 100 with multi-stage energy utilization according to the embodiments of the present invention further includes a condensing device 8 and a deaerator 903. The condensing device 8 has a first condensing inlet 801 and a first condensing outlet 803. The deaerator 903 has a first deaeration inlet 9031 and a first deaeration outlet 9034. The first condensing inlet 801 is connected to the low-pressure steam outlet 4032, the first condensing outlet 803 is connected to the first deaeration inlet 9031, and the first deaeration outlet 9034 is connected to the first water inlet 31. That is to say, the steam discharged from the low-pressure steam outlet 4032 enters the condensing device 8 through the first condensing inlet 801 for condensation. After the steam is condensed into liquid water, it is discharged from the first condensing outlet 803 and then enters the deaeration device through the first deaeration inlet 9031 for deaeration. The liquid water after deaeration is discharged from the first deaeration outlet 9034 and then enters the steam generating device 3 through the first water inlet 31 to be reheated to form main steam, and so on in sequence.

[0135] In some embodiments, as Figure 1 shown, the regenerative system 9 further includes a low-pressure heater system 902.

[0136] The high-pressure heater system 901 has a first high-pressure heater channel 9011 connected to a second high-pressure heater channel 9012. One end of the first high-pressure heater channel 9011 is connected to the first deaeration outlet 9034, and the other end of the first high-pressure heater channel 9011 is connected to the first water inlet 31.

[0137] The deaerator 903 further has a second deaeration inlet 9032. One end of the second high-pressure heater channel 9012 is connected to the second deaeration inlet 9032, and the other end of the second high-pressure heater channel 9012 is connected to at least one of the high-pressure cylinder 401 and the intermediate-pressure cylinder 402.

[0138] The low-pressure heater system 902 has a first low-pressure heater channel 9021. One end of the first low-pressure heater channel 9021 is connected to the first condensing outlet 803, and the other end of the first low-pressure heater channel 9021 is connected to the first deaeration inlet 9031. The condensing device 8 further has a second condensing inlet 802. The low-pressure heater system 902 further has a second low-pressure heater channel 9022. One end of the second low-pressure heater channel 9022 is connected to the second condensing inlet 802, and the other end of the second low-pressure heater channel 9022 is connected to the low-pressure cylinder 403.

[0139] It should be noted that the first high-pressure heater channel 9011 and the second high-pressure heater channel 9012 can exchange heat, and the first low-pressure heater channel 9021 and the second low-pressure heater channel 9022 can exchange heat. That is to say, the steam discharged from the low-pressure cylinder 403 enters the second low-pressure heater channel 9022 through the other end of the second low-pressure heater channel 9022. The liquid water in the first low-pressure heater channel 9021 exchanges heat with the steam in the second low-pressure heater channel 9022, and the temperature of the liquid water in the first low-pressure heater channel 9021 is increased. After the steam in the second low-pressure heater channel 9022 exchanges heat and condenses into liquid water, it is discharged from one end of the second low-pressure heater channel 9022, enters the condensation device 8 through the second condensation outlet, and after further condensation, the liquid water is discharged from the first condensation outlet 803 and enters the first low-pressure heater channel 9021 through one end of the first low-pressure heater channel 9021 and exchanges heat with the steam in the second low-pressure heater channel 9022 to increase the temperature. The liquid water with increased temperature is discharged from the other end of the first high-pressure heater channel 9011 and enters the deaerator through the first deaeration inlet 9031 for deaeration. The deaerated liquid water is discharged from the first deaeration outlet 9034 and enters the first high-pressure heater channel 9011 through one end of the first high-pressure heater channel 9011. The steam discharged from the high-pressure cylinder 401 and the intermediate-pressure cylinder 402 enters the second high-pressure heater channel 9012 through the other end of the second high-pressure heater channel 9012. The liquid water in the first high-pressure heater channel 9011 exchanges heat with the steam in the second high-pressure heater channel 9012, and the temperature of the liquid water in the first high-pressure heater channel 9011 is increased. After the steam in the second high-pressure heater channel 9012 exchanges heat and condenses into liquid water, it is discharged from one end of the second high-pressure heater channel 9012, enters the deaerator through the second deaeration inlet 9032 for deaeration, and after deaeration, the liquid water is discharged from the first deaeration outlet 9034 and enters the first high-pressure heater channel 9011 through one end of the first high-pressure heater channel 9011 and exchanges heat with the steam in the second high-pressure heater channel 9012 to increase the temperature. The liquid water with increased temperature is discharged from the other end of the first high-pressure heater channel 9011 and enters the steam generating device 3 through the first water inlet 31 to be reheated to form main steam.

[0140] It can be understood that the regenerative system 9 uses the steam in the high-pressure cylinder 401 and the intermediate-pressure cylinder 402 to heat the liquid water in the first high-pressure heater pipeline 90131, and uses the steam in the low-pressure cylinder 403 to heat the liquid water in the first high-pressure heater pipeline 90131. So that the temperature of the liquid water entering the steam generating device 3 will not be too low, thereby reducing the energy required for the steam generating device 3 to heat the liquid water into main steam. Therefore, the optical coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiment of the present invention greatly reduces the energy consumption of the optical coal complementary steam turbine system 100 with multi-stage energy utilization of the embodiment of the present invention by setting the regenerative system 9.

[0141] In some embodiments, such as Figure 1As shown, the high-pressure heater system 901 includes a first high-pressure heater device 9013, a second high-pressure heater device 9014, and a third high-pressure heater device 9015. The first high-pressure heater device 9013 has a first high-pressure heater pipeline 90131, and one end of the first high-pressure heater pipeline 90131 is connected to the first deaeration outlet 9034. The second high-pressure heater device 9014 has a second high-pressure heater pipeline 90141, and one end of the second high-pressure heater pipeline 90141 is connected to the other end of the first high-pressure heater pipeline 90131. The third high-pressure heater device 9015 has a third high-pressure heater pipeline 90151, and one end of the third high-pressure heater pipeline 90151 is connected to the other end of the second high-pressure heater pipeline 90141, and the other end of the third high-pressure heater pipeline 90151 is connected to the first water inlet 31. The chambers of the first high-pressure heater pipeline 90131, the second high-pressure heater pipeline 90141, and the first high-pressure heater pipeline 90131 are sequentially communicated to form a first high-pressure heater channel 9011.

[0142] The first high-pressure heater device 9013 further has a first high-pressure heater steam inlet 90132 and a first high-pressure heater steam outlet 90133. The first high-pressure heater steam outlet 90133 is connected to the second deaeration inlet 9032. The second high-pressure heater device 9014 further has a second high-pressure heater steam inlet 90142 and a second high-pressure heater steam outlet 90143. The second high-pressure heater steam outlet 90143 is connected to the first high-pressure heater steam inlet 90132. The third high-pressure heater device 9015 further has a third high-pressure heater steam inlet 90152 and a third high-pressure heater steam outlet 90153. The third high-pressure heater steam outlet 90153 is connected to the second high-pressure heater steam inlet 90142. The third high-pressure heater steam inlet 90152 is connected to one of the high-pressure cylinder 401 and the intermediate-pressure cylinder 402.

[0143] The second high-pressure heater device 9014 further has a fourth high-pressure heater steam inlet 90144, and the fourth high-pressure heater steam inlet 90144 is connected to one of the high-pressure cylinder 401 and the intermediate-pressure cylinder 402. The first high-pressure heater device 9013 further has a fifth high-pressure heater steam inlet 90134, and the fifth high-pressure heater steam inlet 90134 is connected to one of the high-pressure cylinder 401 and the intermediate-pressure cylinder 402.

[0144] Among them, the chambers of the pipeline connecting the first high-pressure heater steam outlet 90133 to the second deaeration inlet 9032, the chamber of the pipeline connecting the second high-pressure heater steam outlet 90143 to the first high-pressure heater steam inlet 90132, and the chamber connecting the third high-pressure heater steam outlet 90153 to the second high-pressure heater steam inlet 90142 are sequentially communicated to form a second high-pressure heater channel 9012.

[0145] The high-pressure heater system 901 uses the steam in the high-pressure cylinder 401 and the intermediate-pressure cylinder 402 to heat the liquid water in the first high-pressure heater pipeline 90131, so that the temperature of the liquid water entering the steam generating device 3 will not be too low, thereby reducing the energy required for the steam generating device 3 to heat the liquid water into main steam. Therefore, the optical coal complementary steam turbine system 100 with multi-stage energy utilization in the embodiment of the present invention greatly reduces the energy consumption of the optical coal complementary steam turbine system 100 with multi-stage energy utilization in the embodiment of the present invention by setting the high-pressure heater system 901.

[0146] In some embodiments, as Figure 1 shown, the low-pressure heater system 902 includes a first low-pressure heater device 9023, a second low-pressure heater device 9024, a third low-pressure heater device 9025, and a fourth low-pressure heater device 9026. The first low-pressure heater device 9023 has a first low-pressure heater pipeline 90231, and one end of the first low-pressure heater pipeline 90231 is connected to the first condensation outlet 803. The second low-pressure heater device 9024 has a second low-pressure heater pipeline 90241, and one end of the second low-pressure heater pipeline 90241 is connected to the other end of the first low-pressure heater pipeline 90231. The third low-pressure heater device 9025 has a third low-pressure heater pipeline 90251, and one end of the third low-pressure heater pipeline 90251 is connected to the other end of the second low-pressure heater pipeline 90241. The fourth low-pressure heater device 9026 has a fourth low-pressure heater pipeline 90261, and one end of the fourth low-pressure heater pipeline 90261 is connected to the other end of the third low-pressure heater pipeline 90251. The other end of the fourth low-pressure heater pipeline 90261 is connected to the first deaeration inlet 9031. The chambers of the first low-pressure heater pipeline 90231, the second low-pressure heater pipeline 90241, the third low-pressure heater pipeline 90251, and the fourth low-pressure heater pipeline 90261 are sequentially communicated to form a first low-pressure heater channel 9021.

[0147] The first low-pressure heater device 9023 also has a first low-pressure heater steam inlet 90232 and a first low-pressure heater steam outlet 90233. The first low-pressure heater steam outlet 90233 is connected to the second condensate inlet 802. The second low-pressure heater device 9024 also has a second low-pressure heater steam inlet 90242 and a second low-pressure heater steam outlet 90243. The second low-pressure heater steam outlet 90243 is connected to the first low-pressure heater steam inlet 90232. The third low-pressure heater device 9025 also has a third low-pressure heater steam inlet 90252 and a third low-pressure heater steam outlet 90253. The third low-pressure heater steam outlet 90253 is connected to the second low-pressure heater steam inlet 90242. The fourth low-pressure heater device 9026 also has a fourth low-pressure heater steam inlet 90262 and a fourth low-pressure heater steam outlet 90263. The fourth low-pressure heater steam outlet 90263 is connected to the third low-pressure heater steam inlet 90252, and the fourth low-pressure heater steam inlet 90262 is connected to the low-pressure cylinder 403. The third low-pressure heater device 9025 also has a fifth low-pressure heater steam inlet 90254, and the fifth low-pressure heater steam inlet 90254 is connected to the low-pressure cylinder 403. The second low-pressure heater device 9024 also has a sixth low-pressure heater steam inlet 90244, and the sixth low-pressure heater steam inlet 90244 is connected to the low-pressure cylinder 403. The first low-pressure heater device 9023 also has a seventh low-pressure heater steam inlet 90234, and the seventh low-pressure heater steam inlet 90234 is connected to the low-pressure cylinder 403.

[0148] Among them, the chambers of the pipelines where the first low-pressure heater steam outlet 90233 is connected to the second condensate inlet 802, the chambers of the pipelines where the second low-pressure heater steam outlet 90243 is connected to the first low-pressure heater steam inlet 90232, the chambers of the pipelines where the third low-pressure heater steam outlet 90253 is connected to the second low-pressure heater steam inlet 90242, and the chambers of the pipelines where the fourth low-pressure heater steam outlet 90263 is connected to the third low-pressure heater steam inlet 90252 are connected in sequence to form a second low-pressure heater channel 9022.

[0149] The low-pressure heater system 902 uses the steam in the low-pressure cylinder 403 to heat the liquid water in the first low-pressure heater pipeline 90231, so that the temperature of the liquid water entering the first high-pressure heater channel 9011 will not be too low, and further the temperature of the liquid water entering the steam generating device 3 will not be too low. Thus, the energy required for the steam generating device 3 to heat the liquid water into main steam can be reduced. Therefore, the optical coal complementary steam turbine system 100 with multi-stage energy utilization in the embodiment of the present invention greatly reduces the energy consumption of the optical coal complementary steam turbine system 100 with multi-stage energy utilization in the embodiment of the present invention by setting the low-pressure heater system 902.

[0150] In some embodiments, as Figure 3 shown, the steam generating device 3 includes a steam generator 33, a first steam heater 34, and a second steam heater 35.

[0151] The steam generator 33 has a first water inlet 31, a third steam outlet 3341 and a fourth steam outlet 3342; the first steam heater 34 includes a first heating inlet 3411 and a first heating outlet 3431, the first heating inlet 3411 communicates with the third steam outlet 3341, and the first heating outlet 3431 communicates with the first steam outlet 32; and the second steam heater 35 includes a second heating inlet 3511 and a second heating outlet 3531, the second heating inlet 3511 communicates with the fourth steam outlet 3342, and the second heating outlet 3531 communicates with the first steam outlet 32.

[0152] Further, as Figure 3 shown, the steam generating device 3 of the embodiment of the present invention includes a steam generator 33, a first steam heater 34 and a second steam heater 35.

[0153] The steam generator 33 includes an economizer 331, a water wall 332, a steam separator 333 and a horizontal low-temperature superheater 334. The economizer 331 has a first water inlet 31, and the economizer 331, the water wall 332, the steam separator 333 and the horizontal low-temperature superheater 334 are connected in sequence. The economizer 331 and the water wall 332 are used to heat water to generate steam, the steam separator 333 is used to separate the unevaporated water in the steam, and the separated water returns to the water wall 332 to be heated and evaporated again. The horizontal low-temperature superheater 334 includes a third steam outlet 3341 and a fourth steam outlet 3342.

[0154] The first steam heater 34 includes a vertical low-temperature superheater 341, a platen superheater 342 and a final superheater 343. Among them, the vertical low-temperature superheater 341 includes a first heating inlet 3411, the final superheater 343 has a first heating outlet 3431, the first heating inlet 3411 communicates with the third steam outlet 3341, and the vertical low-temperature superheater 341, the platen superheater 342 and the final superheater 343 are connected in sequence, so as to heat the steam to form high-temperature and high-pressure main steam.

[0155] The second steam heater 35 includes a horizontal low-temperature reheater 351, a vertical low-temperature reheater 352 and a final reheater 353. Among them, the horizontal low-temperature reheater 351 includes a second heating inlet 3511, the final reheater 353 has a second heating outlet 3531, the second heating inlet 3511 communicates with the fourth steam outlet 3342, and the horizontal low-temperature reheater 351, the vertical low-temperature reheater 352 and the final reheater 353 are connected in sequence, so as to heat the steam to form high-temperature and high-pressure main steam.

[0156] Using the integrated solar and coal-fired steam turbine system 100 with multi-level energy utilization according to an embodiment of the present invention, water enters the steam generator 33 through the first water inlet 31 and is heated to form steam. A part of the steam is discharged from the third steam outlet 3341, enters the first steam heater 34 through the first heating inlet 3411, and is heated to form main steam at high temperature and high pressure (MPa, °C). The formed main steam is discharged through the first heating outlet 3431. Another part of the steam is discharged from the third steam outlet 3341, enters the second steam heater 35 through the second heating inlet 3511, and is heated to form main steam at high temperature and high pressure. The formed main steam is discharged through the second heating outlet 3531. The main steam formed after being heated by the first steam heater 34 and the second steam heater 35 respectively is discharged through the first steam outlet 32.

[0157] The boiler in the related art includes a steam generator 33, a superheater, and a reheater. The steam generator 33 has a first outlet 90112 and a second outlet. The superheater has a steam inlet and a main steam outlet. The reheater includes a cold reheat steam inlet and a hot reheat steam outlet. The first outlet 90112 and the second outlet are both connected to the steam inlet. Steam is discharged from the first outlet 90112 and the second outlet and enters the superheater for heating to form main steam. The main steam is discharged through the main steam outlet for use by the high-pressure cylinder 401 of the steam turbine 4. The cold reheat steam generated after doing work in the high-pressure cylinder 401 needs to return to the traditional boiler again and enters the reheater through the cold reheat steam inlet for heating to form hot reheat steam. The hot reheat steam is discharged from the hot reheat steam outlet for use by the intermediate-pressure cylinder 402.

[0158] The steam generating device 3 of the integrated solar and coal-fired steam turbine system 100 with multi-level energy utilization according to an embodiment of the present invention can be simply modified from the boiler in the related art. Disconnect the first outlet 90112 of the steam generator 33 of the boiler in the related art from the steam inlet, and connect the cold reheat steam inlet of the reheater to the first outlet 90112 of the steam generator 33, so that the reheater and the superheater together heat the steam generated by the steam generating device 3. Thus, only some pipelines in the traditional boiler need to be modified to make the traditional boiler compatible with the integrated solar and coal-fired steam turbine system 100 with multi-level energy utilization according to an embodiment of the present invention, without the need to perform large-scale modification on the traditional boiler or spend costs to manufacture the steam generating device 3. Therefore, the steam generating device 3 of the steam turbine 4 system with integrated solar and coal combustion according to an embodiment of the present invention is easy to reuse and transform, and has the advantage of low layout cost.

[0159] An embodiment of the present invention also provides a power generation system, including a generator 200 and the integrated solar and coal-fired steam turbine system 100 with multi-level energy utilization described in the above embodiment. The power generation system provided by the embodiment of the present invention has the advantages of low use cost, low energy consumption, and environmental protection by adopting the integrated solar and coal-fired steam turbine system 100 with multi-level energy utilization.

[0160] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. 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 thus should not be construed as a limitation on the present invention.

[0161] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0162] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0163] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0164] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0165] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A light-coal complementary steam turbine system with multi-level energy utilization, characterized in that Comprising: A solar thermal system having a first medium inlet and a first medium outlet; A first heat exchanger having a first heat absorption side inlet, a first heat absorption side outlet, a first heat release side inlet, and a first heat release side outlet, wherein the first heat release side inlet is connected to the first medium outlet, A second heat exchanger having a second air inlet, a second air outlet, a second heat release side inlet, and a second heat release side outlet, wherein the second heat release side outlet is connected to the first medium inlet, and the second heat release side inlet is connected to the first heat release side outlet; A steam generating device having a first water inlet and a first steam outlet, The steam generating device includes: A steam generator having the first water inlet, a third steam outlet, and a fourth steam outlet; A first steam heater including a first heating inlet and a first heating outlet, wherein the first heating inlet is in communication with the third steam outlet, and the first heating outlet is in communication with the first steam outlet; and A second steam heater including a second heating inlet and a second heating outlet, wherein the second heating inlet is in communication with the fourth steam outlet, and the second heating outlet is in communication with the first steam outlet; A steam turbine including a high-pressure cylinder and an intermediate-pressure cylinder, wherein the high-pressure cylinder has a high-pressure steam inlet and a high-pressure steam outlet, the high-pressure steam inlet is connected to the first steam outlet, and the high-pressure steam outlet is connected to the first heat absorption side inlet; The intermediate-pressure cylinder has an intermediate-pressure steam inlet and an intermediate-pressure steam outlet, and the intermediate-pressure steam inlet is connected to the first heat absorption side outlet.

2. The light-coal complementary steam turbine system for multi-stage energy utilization according to claim 1, characterized in that, Further comprising: A first pipeline, one end of which is connected to the first medium outlet, and the other end of which is connected to the first heat release side inlet; A second pipeline, one end of which is connected to the first medium inlet, and the other end of which is connected to the second heat release side outlet; A third pipeline, one end of which is connected to the first heat release side outlet, and the other end of which is connected to the second heat release side inlet.

3. The optical coal complementary steam turbine system for multi-stage energy utilization according to claim 2, characterized in that, Further comprising an energy storage system, the energy storage system including: A third heat exchanger having a first heat exchange channel and a second heat exchange channel, wherein the first heat exchange channel has a first heat exchange inlet and outlet and a second heat exchange inlet and outlet, the second heat exchange channel has a third heat exchange inlet and outlet and a fourth heat exchange inlet and outlet, the first heat exchange inlet and outlet is connected to the first pipeline, and the second heat exchange inlet and outlet is connected to the second pipeline; A first medium tank having a first medium inlet and outlet, which is connected to the third heat exchange inlet and outlet; A second medium tank having a second medium inlet and outlet, which is connected to the fourth heat exchange inlet and outlet.

4. The light-coal complementary steam turbine system for multi-stage energy utilization according to claim 2, characterized in that, Further includes a regenerative system and a fourth heat exchanger. The fourth heat exchanger has a fourth heat-releasing side inlet, a fourth heat-releasing side outlet, a fourth heat-absorbing side inlet, and a fourth heat-absorbing side outlet. The fourth heat-releasing side inlet is connected to the third pipeline, and the fourth heat-releasing side outlet is connected to the second pipeline; The regenerative system includes a high-pressure heater system. The high-pressure heater system has a first high-pressure heater channel. One end of the first high-pressure heater channel is connected to the intermediate-pressure cylinder, and the other end of the first high-pressure heater channel is connected to the first water inlet. The first high-pressure heater channel has a first inlet and a first outlet. The first inlet is connected to the fourth heat-absorbing side outlet, and the first outlet is connected to the fourth heat-absorbing side outlet.

5. The light-coal complementary steam turbine system for multi-stage energy utilization according to claim 4, characterized in that Further includes a low-pressure cylinder. The low-pressure cylinder has a low-pressure steam inlet and a low-pressure steam outlet. The intermediate-pressure steam outlet is connected to the low-pressure steam inlet.

6. The light-coal complementary steam turbine system for multi-stage energy utilization according to claim 5, wherein Further includes a condensing device and a deaerator. The condensing device has a first condensing inlet and a first condensing outlet. The deaerator has a first deaerating inlet and a first deaerating outlet. The first condensing inlet is connected to the low-pressure steam outlet, the first condensing outlet is connected to the first deaerating inlet, and the first deaerating outlet is connected to the first water inlet.

7. The light-coal complementary steam turbine system for multi-level energy utilization according to claim 6, characterized in that, The regenerative system further includes a low-pressure heater system. One end of the first high-pressure heater channel is connected to the first deaerating outlet, and the other end of the first high-pressure heater channel is connected to the first water inlet; The high-pressure heater system further has a second high-pressure heater channel. One end of the second high-pressure heater channel is connected to the first deaerating outlet, and the other end of the second high-pressure heater channel is connected to at least one of the high-pressure cylinder and the intermediate-pressure cylinder; The low-pressure heater system has a first low-pressure heater channel. One end of the first low-pressure heater channel is connected to the first condensing outlet, and the other end of the first low-pressure heater channel is connected to the first deaerating inlet; The condensing device further has a second condensing inlet. The low-pressure heater system further has a second low-pressure heater channel. One end of the second low-pressure heater channel is connected to the second condensing inlet, and the other end of the second low-pressure heater channel is connected to the low-pressure cylinder.

8. The light-coal complementary steam turbine system for multi-stage energy utilization according to claim 7, characterized in that, The high-pressure heater system includes: A first high-pressure heater device. The first high-pressure heater device has a first high-pressure heater pipeline. One end of the first high-pressure heater pipeline is connected to the first deaerating outlet; A second high-pressure heater device. The second high-pressure heater device has a second high-pressure heater pipeline. One end of the second high-pressure heater pipeline is connected to the other end of the first high-pressure heater pipeline; A third high-pressure heater device. The third high-pressure heater device has a third high-pressure heater pipeline. One end of the third high-pressure heater pipeline is connected to the other end of the second high-pressure heater pipeline, and the other end of the third high-pressure heater pipeline is connected to the first water inlet. The chambers of the first high-pressure heater pipeline, the second high-pressure heater pipeline, and the third high-pressure heater pipeline are sequentially connected to form the first high-pressure heater channel; The deaerator further has a second deaerating inlet. The first high-pressure heater device further has a first high-pressure heater steam inlet and a first high-pressure heater steam outlet. The first high-pressure heater steam outlet is connected to the second deaerating inlet. The second high-pressure heater device further has a second high-pressure heater steam inlet and a second high-pressure heater steam outlet, and the second high-pressure heater steam outlet is connected to the first high-pressure heater steam inlet. The third high-pressure heater device further has a third high-pressure heater steam inlet and a third high-pressure heater steam outlet, the third high-pressure heater steam outlet is connected to the second high-pressure heater steam inlet, and the third high-pressure heater steam inlet is connected to one of the high-pressure cylinder and the intermediate-pressure cylinder. The second high-pressure heater device further has a fourth high-pressure heater steam inlet, and the fourth high-pressure heater steam inlet is connected to one of the high-pressure cylinder and the intermediate-pressure cylinder. The first high-pressure heater device further has a fifth high-pressure heater steam inlet, and the fifth high-pressure heater steam inlet is connected to one of the high-pressure cylinder and the intermediate-pressure cylinder.

9. The light-coal complementary steam turbine system with multi-stage energy utilization according to claim 7, characterized in that, The low-pressure heater system includes: A first low-pressure heater device, the first low-pressure heater device having a first low-pressure heater pipeline, one end of the first low-pressure heater pipeline being connected to the first condensate outlet. A second low-pressure heater device, the second low-pressure heater device having a second low-pressure heater pipeline, one end of the second low-pressure heater pipeline being connected to the other end of the first low-pressure heater pipeline. A third low-pressure heater device, the third low-pressure heater device having a third low-pressure heater pipeline, one end of the third low-pressure heater pipeline being connected to the other end of the second low-pressure heater pipeline. A fourth low-pressure heater device, the fourth low-pressure heater device having a fourth low-pressure heater pipeline, one end of the fourth low-pressure heater pipeline being connected to the other end of the third low-pressure heater pipeline, and the other end of the fourth low-pressure heater pipeline being connected to the first deaeration inlet; the chambers of the first low-pressure heater pipeline, the second low-pressure heater pipeline, the third low-pressure heater pipeline, and the fourth low-pressure heater pipeline are sequentially communicated to form the first low-pressure heater passage. The first low-pressure heater device further has a first low-pressure heater steam inlet and a first low-pressure heater steam outlet, and the first low-pressure heater steam outlet is connected to the second condensate inlet. The second low-pressure heater device further has a second low-pressure heater steam inlet and a second low-pressure heater steam outlet, and the second low-pressure heater steam outlet is connected to the first low-pressure heater steam inlet. The third low-pressure heater device further has a third low-pressure heater steam inlet and a third low-pressure heater steam outlet, and the third low-pressure heater steam outlet is connected to the second low-pressure heater steam inlet. The fourth low-pressure heater device further has a fourth low-pressure heater steam inlet and a fourth low-pressure heater steam outlet, the fourth low-pressure heater steam outlet is connected to the third low-pressure heater steam inlet, and the fourth low-pressure heater steam inlet is connected to the low-pressure cylinder. The third low-pressure heater device further has a fifth low-pressure heater steam inlet, and the fifth low-pressure heater steam inlet is connected to the low-pressure cylinder. The second low-pressure heater device further has a sixth low-pressure heater steam inlet, and the sixth low-pressure heater steam inlet is connected to the low-pressure cylinder. The first low-pressure heater device further has a seventh low-pressure heater steam inlet, and the seventh low-pressure heater steam inlet is connected to the low-pressure cylinder.

10. A power generation system, characterized in that, Including: A generator A steam turbine system, the steam turbine system being the solar-thermal and coal-complementary steam turbine system according to any one of claims 1-9.

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