CN219974586U - Coal-fired unit sliding temperature system and coal-fired cogeneration unit - Google Patents
Coal-fired unit sliding temperature system and coal-fired cogeneration unit Download PDFInfo
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- CN219974586U CN219974586U CN202321653093.9U CN202321653093U CN219974586U CN 219974586 U CN219974586 U CN 219974586U CN 202321653093 U CN202321653093 U CN 202321653093U CN 219974586 U CN219974586 U CN 219974586U
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- 150000003839 salts Chemical class 0.000 claims abstract description 207
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000000605 extraction Methods 0.000 claims description 14
- 238000005338 heat storage Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of cogeneration, in particular to a coal-fired unit sliding temperature system and a coal-fired cogeneration unit. The coal-fired unit sliding temperature system comprises: the steam side inlet of the first steam molten salt heat exchanger is connected with the inlet of the high-pressure cylinder through a first pipeline, and a first valve is arranged on the first pipeline; the molten salt side outlet of the first steam molten salt heat exchanger is connected with the inlet of the high-temperature molten salt tank, and the molten salt side inlet of the first steam molten salt heat exchanger is connected with the outlet of the low-temperature molten salt tank; the steam side inlet of the second steam molten salt heat exchanger is connected with the middle pressure cylinder inlet through a second pipeline, and a second valve is arranged on the second pipeline; the molten salt side outlet of the second steam molten salt heat exchanger is connected with the inlet of the high-temperature molten salt tank, and the molten salt side inlet of the second steam molten salt heat exchanger is connected with the outlet of the low-temperature molten salt tank. The coal-fired unit sliding temperature system provided by the utility model can improve the operation flexibility of the cogeneration unit and the unit efficiency.
Description
Technical Field
The utility model relates to the technical field of cogeneration, in particular to a coal-fired unit sliding temperature system and a coal-fired cogeneration unit.
Background
The problems of energy shortage, climate change, environmental pollution and the like are increasingly serious, and new challenges are presented to the development of an electric power system. But is limited by the energy endowment of rich coal, lean oil and less gas in China, the coal-fired power generation plays an important role continuously in the aspects of ensuring the safe operation of a power grid, meeting the basic energy consumption requirements of society, promoting new energy consumption and the like.
The cogeneration system is a system which can supply heat and generate electricity, and is an effective way for realizing energy cascade utilization and improving the efficiency of the coal-fired unit. The heat with higher temperature and larger available energy is used for generating electricity, and the low-grade heat energy with lower temperature is used for supplying heat, so that the energy utilization efficiency is improved, various functional requirements of users are met, and the energy-saving heat-generating system has good economic benefit and environmental benefit. However, the existing cogeneration unit is limited by multi-output energy flow coupling, has insufficient operation flexibility and lower unit efficiency.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defects that the existing cogeneration unit in the prior art is limited by multi-output energy flow coupling, the operation flexibility is insufficient and the unit efficiency is low, so that the coal-fired unit sliding temperature system capable of improving the operation flexibility of the cogeneration unit and the unit efficiency and the coal-fired cogeneration unit with the same are provided.
In order to solve the technical problems, the utility model provides a sliding temperature system of a coal-fired unit, comprising:
a high pressure cylinder and a medium pressure cylinder;
a high temperature salt melting tank and a low temperature salt melting tank;
the steam side inlet of the first steam molten salt heat exchanger is connected with the inlet of the high-pressure cylinder through a first pipeline, and a first valve is arranged on the first pipeline; the molten salt side outlet of the first steam molten salt heat exchanger is connected with the inlet of the high-temperature molten salt tank, and the molten salt side inlet of the first steam molten salt heat exchanger is connected with the outlet of the low-temperature molten salt tank;
the steam side inlet of the second steam molten salt heat exchanger is connected with the inlet of the medium pressure cylinder through a second pipeline, and a second valve is arranged on the second pipeline; the molten salt side outlet of the second steam molten salt heat exchanger is connected with the inlet of the high-temperature molten salt tank, and the molten salt side inlet of the second steam molten salt heat exchanger is connected with the outlet of the low-temperature molten salt tank;
in the working process, the proportion of the split working medium is adjusted by changing the opening of the first valve and the second valve so as to adjust the temperature of steam entering the high-pressure cylinder and the medium-pressure cylinder and adjust the proportion of output power and heat storage.
Optionally, the coal-fired unit sliding temperature system further comprises a first heat supply network heater, a hot side inlet of the first heat supply network heater is connected with an outlet of the high-temperature molten salt tank, a hot side outlet of the first heat supply network heater is connected with an inlet of the low-temperature molten salt tank, and a cold side inlet and a cold side outlet of the first heat supply network heater are suitable for being connected with industrial heat users.
Optionally, the molten salt side inlet of the first steam molten salt heat exchanger is connected with the outlet of the low-temperature molten salt tank through a third pipeline, and a third valve is arranged on the third pipeline;
the molten salt side inlet of the second steam molten salt heat exchanger is connected with the outlet of the low-temperature molten salt tank through a fourth pipeline, and a fourth valve is arranged on the fourth pipeline.
Optionally, the hot side inlet of the first heat supply network heater is connected with the outlet of the high temperature molten salt tank through a fifth pipeline, and a fifth valve is arranged on the fifth pipeline.
Optionally, the steam side outlet of the first steam molten salt heat exchanger is connected with the inlet of the high-pressure cylinder through a first loop;
and a steam side outlet of the second steam molten salt heat exchanger is connected with an inlet of the medium pressure cylinder through a second loop.
The utility model provides a coal-fired cogeneration unit, which comprises:
a boiler, and a coal-fired unit slip temperature system as described above;
the first outlet of the boiler is connected with the inlet of the high-pressure cylinder through a new steam pipeline, and the first outlet of the high-pressure cylinder is connected with the first inlet of the boiler;
the second outlet of the boiler is connected with the inlet of the medium pressure cylinder through a reheat steam pipeline.
Optionally, the coal-fired cogeneration unit further comprises a feedwater regenerator group, wherein a water side outlet of the feedwater regenerator group is connected with a second inlet of the boiler;
the high-pressure cylinder is connected with the water supply heat regenerator group through a first steam extraction pipeline, and the medium-pressure cylinder is connected with the water supply heat regenerator group through a second steam extraction pipeline.
Optionally, the coal-fired cogeneration unit further comprises a second heat supply network heater, wherein a hot side inlet of the second heat supply network heater is connected with an outlet of the medium pressure cylinder, and a hot side outlet of the second heat supply network heater is connected with a water side inlet of the feedwater regenerator group; the cold side inlet and cold side outlet of the second heat network heater are adapted to connect to a hot user.
Optionally, the coal-fired cogeneration unit further comprises a molten salt feed water heater, wherein a hot side inlet of the molten salt feed water heater is connected with an outlet of the high-temperature molten salt tank through a sixth pipeline, and a sixth valve is arranged on the sixth pipeline; the hot side outlet of the molten salt feed water heater is connected with the inlet of the low-temperature molten salt tank;
the cold side inlet of the molten salt feed water heater is connected with the hot side outlet of the second heat supply network heater through a seventh pipeline, and a seventh valve is arranged on the seventh pipeline; the cold side outlet of the molten salt feedwater heater is connected with the second inlet of the boiler.
Optionally, the molten salt operation temperature area of the low-temperature molten salt tank and/or the high-temperature molten salt tank is T, and T is more than or equal to 350 ℃ and less than or equal to 550 ℃.
The technical scheme of the utility model has the following advantages:
1. according to the coal-fired unit sliding temperature system, when heat is stored, the first valve and the second valve are opened, inlet working media of the high-pressure cylinder and the medium-pressure cylinder are split, part of the split inlet working media of the high-pressure cylinder enter the first steam molten salt heat exchanger to heat molten salt, and part of the split inlet working media of the medium-pressure cylinder enter the second steam molten salt heat exchanger to heat molten salt, so that the heated molten salt is stored in the high-temperature molten salt tank to store heat, and the cooled working media and main path working media are converged and enter a steam turbine; the inlet working medium of a part of the high-pressure cylinder and the inlet working medium of a part of the medium-pressure cylinder are subjected to heat storage by diversion, so that the temperature of the inlet working medium of the steam turbine is regulated, the output power is changed, and the stored heat can be used for heating industrial steam, so that the thermoelectric ratio of a unit is improved; the opening degree of the first valve and the opening degree of the second valve are changed to adjust the proportion of the split-flow working medium of the high-pressure cylinder and the middle-pressure cylinder, so that the steam temperature entering the high-pressure cylinder and the middle-pressure cylinder is adjusted, the proportion of output power and heat storage is adjusted, the flexibility of the unit is improved, and the efficiency of the unit is improved.
2. According to the coal-fired unit sliding temperature system provided by the utility model, the hot side inlet of the first heat supply network heater is connected with the outlet of the high-temperature molten salt tank, the hot side outlet of the first heat supply network heater is connected with the inlet of the low-temperature molten salt tank, and the cold side inlet and the cold side outlet of the first heat supply network heater are suitable for being connected with industrial heat users; during heat release, the hot side inlet of the first heat supply network heater is communicated with the outlet of the high-temperature molten salt tank, the high-temperature molten salt tank releases high-temperature molten salt to the first heat supply network heater, heat supply network backwater to a superheated steam state in the first heat supply network heater due to high temperature of molten salt, industrial heat supply is supplied, and low-temperature molten salt after heat release returns to the low-temperature molten salt tank, so that the thermoelectric ratio of a unit is improved.
3. The high-pressure cylinder of the coal-fired cogeneration unit is connected with the water supply heat regenerator group through a first steam extraction pipeline, and the medium-pressure cylinder is connected with the water supply heat regenerator group through a second steam extraction pipeline; a sixth valve is arranged on the sixth pipeline, and a seventh valve is arranged on the seventh pipeline; when releasing heat, the sixth valve and the seventh valve can be opened, so that the high-temperature molten salt tank releases high-temperature molten salt to the molten salt feed water heater, the split boiler feed water is heated in the molten salt feed water heater and is sent to the boiler, the low-temperature molten salt after heat release returns to the low-temperature molten salt tank, and therefore backheating steam extraction of the high-pressure cylinder and the medium-pressure cylinder can be reduced, output power is increased, and unit flexibility is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic connection diagram of a coal-fired cogeneration unit with a coal-fired unit temperature sliding system and a coal-fired unit temperature sliding system.
Reference numerals illustrate:
10. a boiler; 11. a high-pressure cylinder; 12. a medium pressure cylinder; 13. a high temperature salt melting tank; 14. a low-temperature salt melting tank; 15. a feedwater regenerator set; 16. molten salt feed water heater;
21. a first steam molten salt heat exchanger; 22. a second steam molten salt heat exchanger;
31. a first heating network heater; 32. a second heating network heater;
41. a first pipeline; 410. a first valve; 42. a second pipeline; 420. a second valve; 43. a third pipeline; 430. a third valve; 44. a fourth pipeline; 440. a fourth valve; 45. a fifth pipeline; 450. a fifth valve; 46. a sixth pipeline; 460. a sixth valve; 47. a seventh pipeline; 470. a seventh valve;
51. a first loop; 52. a second loop;
61. a new steam pipeline; 62. reheat steam line;
71. a first extraction line; 72. and a second steam extraction pipeline.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1
Referring to fig. 1, the sliding temperature system of a coal-fired unit provided in this embodiment includes:
a high pressure cylinder 11 and a medium pressure cylinder 12;
a high-temperature molten salt tank 13 and a low-temperature molten salt tank 14;
the steam side inlet of the first steam molten salt heat exchanger 21 is connected with the inlet of the high pressure cylinder 11 through a first pipeline 41, and a first valve 410 is arranged on the first pipeline 41; the molten salt side outlet of the first steam molten salt heat exchanger 21 is connected with the inlet of the high-temperature molten salt tank 13, and the molten salt side inlet of the first steam molten salt heat exchanger 21 is connected with the outlet of the low-temperature molten salt tank 14;
the steam side inlet of the second steam molten salt heat exchanger 22 is connected with the inlet of the medium pressure cylinder 12 through a second pipeline 42, and a second valve 420 is arranged on the second pipeline 42; the molten salt side outlet of the second steam molten salt heat exchanger 22 is connected with the inlet of the high-temperature molten salt tank 13, and the molten salt side inlet of the second steam molten salt heat exchanger 22 is connected with the outlet of the low-temperature molten salt tank 14;
during operation, the opening degree of the first valve 410 and the opening degree of the second valve 420 are changed to adjust the proportion of the split working medium, so as to adjust the temperature of steam entering the high pressure cylinder 11 and the medium pressure cylinder 12, and adjust the proportion of output power and heat storage.
In this embodiment, the sliding temperature system of the coal-fired unit is an energy-storage type sliding temperature system of the coal-fired unit. Referring to fig. 1, the sliding temperature system of the coal-fired unit comprises a high-pressure cylinder 11, a medium-pressure cylinder 12, a high-temperature molten salt tank 13, a low-temperature molten salt tank 14, a first steam molten salt heat exchanger 21 and a second steam molten salt heat exchanger 22; the steam side inlet of the first steam molten salt heat exchanger 21 is connected with the steam inlet of the high-pressure cylinder 11 through a first pipeline 41, the molten salt side outlet of the first steam molten salt heat exchanger 21 is connected with the inlet of the high-temperature molten salt tank 13, and the molten salt side inlet of the first steam molten salt heat exchanger 21 is connected with the outlet of the low-temperature molten salt tank 14; the steam side inlet of the second steam molten salt heat exchanger 22 is connected with the steam inlet of the medium pressure cylinder 12 through a second pipeline 42, the molten salt side outlet of the second steam molten salt heat exchanger 22 is connected with the inlet of the high-temperature molten salt tank 13, and the molten salt side inlet of the second steam molten salt heat exchanger 22 is connected with the outlet of the low-temperature molten salt tank 14; the first pipeline 41 is provided with a first valve 410, the opening of the first valve 410 is adjustable, the second pipeline 42 is provided with a second valve 420, the opening of the second valve 420 is adjustable, when the heat is stored, the first valve 410 and the second valve 420 are opened to split the inlet working media of the high-pressure cylinder 11 and the medium-pressure cylinder 12, part of the split inlet working media of the high-pressure cylinder 11 enter the first steam molten salt heat exchanger 21 to heat molten salt, and part of the split inlet working media of the medium-pressure cylinder 12 enter the second steam molten salt heat exchanger 22 to heat molten salt, so that the heated molten salt is stored in the high-temperature molten salt tank 13 to store heat, and the cooled working media and main path working media are converged into a steam turbine; the inlet working medium of part of the high-pressure cylinder 11 and the inlet working medium of part of the medium-pressure cylinder 12 are split to store heat, so that the temperature of the inlet working medium of the steam turbine is regulated, the output power is changed, and the stored heat can be used for heating industrial steam, so that the thermoelectric ratio of a unit is improved; the opening degree of the first valve 410 and the opening degree of the second valve 420 are changed to adjust the proportion of the split working medium of the high-pressure cylinder 11 and the medium-pressure cylinder 12, so that the temperature of steam entering the high-pressure cylinder 11 and the medium-pressure cylinder 12 can be adjusted, the proportion of output power and heat storage can be adjusted, the flexibility of a unit can be improved, and the efficiency of the unit can be improved.
Specifically, the coal-fired unit sliding temperature system further comprises a first heat supply network heater 31, a hot side inlet of the first heat supply network heater 31 is connected with an outlet of the high-temperature molten salt tank 13, a hot side outlet of the first heat supply network heater 31 is connected with an inlet of the low-temperature molten salt tank 14, and a cold side inlet and a cold side outlet of the first heat supply network heater 31 are suitable for being connected with industrial heat users.
It should be noted that, referring to fig. 1, the hot side inlet of the first heat supply network heater 31 is connected to the outlet of the high temperature molten salt tank 13, the hot side outlet of the first heat supply network heater 31 is connected to the inlet of the low temperature molten salt tank 14, and the cold side inlet and the cold side outlet of the first heat supply network heater 31 are adapted to be connected to industrial heat users; during heat storage, part of the inlet working medium of the high-pressure cylinder 11 enters the first steam molten salt heat exchanger 21 to heat molten salt, and part of the inlet working medium of the medium-pressure cylinder 12 enters the second steam molten salt heat exchanger 22 to heat molten salt, so that the heated molten salt is stored in the high-temperature molten salt tank 13, during heat release, the hot side inlet of the first heat supply network heater 31 is communicated with the outlet of the high-temperature molten salt tank 13, the high-temperature molten salt tank 13 releases high-temperature molten salt to the first heat supply network heater 31, and because the temperature of the molten salt is high, the heat supply network is heated to a superheated steam state in the first heat supply network heater 31 to supply heat for industrial use, and the low-temperature molten salt after heat release returns to the low-temperature molten salt tank 14, so that the heat-power ratio of a unit is improved.
Specifically, the molten salt side inlet of the first steam molten salt heat exchanger 21 is connected with the outlet of the low-temperature molten salt tank 14 through a third pipeline 43, and a third valve 430 is arranged on the third pipeline 43;
the molten salt side inlet of the second steam molten salt heat exchanger 22 is connected with the outlet of the low-temperature molten salt tank 14 through a fourth pipeline 44, and a fourth valve 440 is arranged on the fourth pipeline 44.
It should be noted that, referring to fig. 1, a third valve 430 is disposed on the third pipeline 43, and the third valve 430 is adapted to selectively communicate the molten salt side inlet of the first steam molten salt heat exchanger 21 with the outlet of the low-temperature molten salt tank 14; a fourth valve 440 is disposed on the fourth pipe 44, and the fourth valve 440 is adapted to selectively communicate the molten salt side inlet of the second steam molten salt heat exchanger 22 with the outlet of the low temperature molten salt tank 14; during heat storage, the first valve 410, the second valve 420, the third valve 430 and the fourth valve 440 are opened simultaneously.
Specifically, the hot side inlet of the first heat supply network heater 31 is connected to the outlet of the high temperature molten salt tank 13 through a fifth pipeline 45, and a fifth valve 450 is disposed on the fifth pipeline 45.
It should be noted that, referring to fig. 1, a fifth valve 450 is disposed on the fifth pipeline 45, where the fifth valve 450 is adapted to selectively communicate the hot side inlet of the first heat supply network heater 31 with the outlet of the high-temperature molten salt tank 13, and when releasing heat, the fifth valve 450 is opened, and the hot side inlet of the first heat supply network heater 31 is communicated with the outlet of the high-temperature molten salt tank 13, so that the high-temperature molten salt tank 13 releases high-temperature molten salt to the first heat supply network heater 31.
Specifically, the steam side outlet of the first steam molten salt heat exchanger 21 is connected to the inlet of the high pressure cylinder 11 through a first circuit 51;
the steam side outlet of the second steam molten salt heat exchanger 22 is connected to the inlet of the intermediate pressure cylinder 12 by a second circuit 52.
Example two
Referring to fig. 1, the coal-fired cogeneration unit provided in this embodiment includes:
a boiler 10, a coal-fired unit slip temperature system as described above;
the first outlet of the boiler 10 is connected with the inlet of the high-pressure cylinder 11 through a new steam pipeline 61, and the first outlet of the high-pressure cylinder 11 is connected with the first inlet of the boiler 10;
the second outlet of the boiler 10 is connected to the inlet of the intermediate pressure cylinder 12 via a reheat steam line 62.
Specifically, the coal-fired cogeneration unit further comprises a feedwater regenerator group 15, and a water side outlet of the feedwater regenerator group 15 is connected with a second inlet of the boiler 10;
the high-pressure cylinder 11 is connected with the feedwater regenerator set 15 through a first steam extraction pipeline 71, and the medium-pressure cylinder 12 is connected with the feedwater regenerator set 15 through a second steam extraction pipeline 72.
Specifically, the coal-fired cogeneration unit further comprises a second heat supply network heater 32, wherein a hot side inlet of the second heat supply network heater 32 is connected with an outlet of the medium pressure cylinder 12, and a hot side outlet of the second heat supply network heater 32 is connected with a water side inlet of the feedwater regenerator group 15; the cold side inlet and cold side outlet of the second heat network heater 32 are adapted to connect to a hot user.
Specifically, the coal-fired cogeneration unit further comprises a molten salt feed water heater 16, wherein a hot side inlet of the molten salt feed water heater 16 is connected with an outlet of the high-temperature molten salt tank 13 through a sixth pipeline 46, and a sixth valve 460 is arranged on the sixth pipeline 46; the hot side outlet of the molten salt feed water heater 16 is connected with the inlet of the low temperature molten salt tank 14;
the cold side inlet of the molten salt feedwater heater 16 is connected with the hot side outlet of the second heat supply network heater 32 through a seventh pipeline 47, and a seventh valve 470 is arranged on the seventh pipeline 47; the cold side outlet of the molten salt feedwater heater 16 is connected to a second inlet of the boiler 10.
It should be noted that, referring to fig. 1, the high-pressure cylinder 11 is connected to the feedwater regenerator set 15 through a first steam extraction pipeline 71, and the medium-pressure cylinder 12 is connected to the feedwater regenerator set 15 through a second steam extraction pipeline 72; a sixth valve 460 is provided on the sixth conduit 46, the sixth valve 460 being adapted to selectively communicate the hot side inlet of the molten salt feedwater heater 16 with the outlet of the high temperature molten salt tank 13; a seventh valve 470 is provided on the seventh conduit 47, the seventh valve 470 being adapted to selectively communicate the cold side inlet of the molten salt feedwater heater 16 with the hot side outlet of the second grid heater 32; during heat release, the sixth valve 460 and the seventh valve 470 may be opened, so that the high temperature molten salt tank 13 releases high temperature molten salt to the molten salt feed water heater 16, the split boiler feed water is heated in the molten salt feed water heater 16, the heated feed water is sent to the boiler 10, and the low temperature molten salt after heat release returns to the low temperature molten salt tank 14, thereby reducing the regenerative steam extraction of the high pressure cylinder 11 and the medium pressure cylinder 12, increasing the output power, and improving the flexibility of the unit.
Specifically, the molten salt operation temperature zone of the low-temperature molten salt tank 14 and/or the high-temperature molten salt tank 13 is T, and T is more than or equal to 350 ℃ and less than or equal to 550 ℃.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. A coal-fired unit slip temperature system, comprising:
a high pressure cylinder (11) and a medium pressure cylinder (12);
a high-temperature molten salt tank (13) and a low-temperature molten salt tank (14);
the steam side inlet of the first steam molten salt heat exchanger (21) is connected with the inlet of the high-pressure cylinder (11) through a first pipeline (41), and a first valve (410) is arranged on the first pipeline (41); the molten salt side outlet of the first steam molten salt heat exchanger (21) is connected with the inlet of the high-temperature molten salt tank (13), and the molten salt side inlet of the first steam molten salt heat exchanger (21) is connected with the outlet of the low-temperature molten salt tank (14);
the steam side inlet of the second steam molten salt heat exchanger (22) is connected with the inlet of the medium pressure cylinder (12) through a second pipeline (42), and a second valve (420) is arranged on the second pipeline (42); the molten salt side outlet of the second steam molten salt heat exchanger (22) is connected with the inlet of the high-temperature molten salt tank (13), and the molten salt side inlet of the second steam molten salt heat exchanger (22) is connected with the outlet of the low-temperature molten salt tank (14);
in the working process, the proportion of the split working medium is adjusted by changing the opening of the first valve (410) and the second valve (420) so as to adjust the temperature of steam entering the high-pressure cylinder (11) and the medium-pressure cylinder (12) and adjust the proportion of output power and heat storage.
2. The coal-fired unit slip temperature system of claim 1, further comprising a first heat grid heater (31), a hot side inlet of the first heat grid heater (31) being connected with an outlet of the high temperature molten salt tank (13), a hot side outlet of the first heat grid heater (31) being connected with an inlet of the low temperature molten salt tank (14), a cold side inlet and a cold side outlet of the first heat grid heater (31) being adapted to connect industrial heat users.
3. The coal-fired unit sliding temperature system according to claim 1 or 2, characterized in that a molten salt side inlet of the first steam molten salt heat exchanger (21) is connected with an outlet of the low-temperature molten salt tank (14) through a third pipeline (43), and a third valve (430) is arranged on the third pipeline (43);
the molten salt side inlet of the second steam molten salt heat exchanger (22) is connected with the outlet of the low-temperature molten salt tank (14) through a fourth pipeline (44), and a fourth valve (440) is arranged on the fourth pipeline (44).
4. The coal-fired unit sliding temperature system according to claim 2, wherein a fifth pipeline (45) is connected between the hot side inlet of the first heat supply network heater (31) and the outlet of the high-temperature molten salt tank (13), and a fifth valve (450) is arranged on the fifth pipeline (45).
5. The coal-fired unit sliding temperature system according to claim 1, characterized in that the steam side outlet of the first steam molten salt heat exchanger (21) is connected with the inlet of the high pressure cylinder (11) through a first loop (51);
the steam side outlet of the second steam molten salt heat exchanger (22) is connected with the inlet of the medium pressure cylinder (12) through a second loop (52).
6. A coal-fired cogeneration unit comprising:
a boiler (10), and a coal-fired unit slip temperature system as claimed in any of the preceding claims 1-5;
the first outlet of the boiler (10) is connected with the inlet of the high-pressure cylinder (11) through a new steam pipeline (61), and the first outlet of the high-pressure cylinder (11) is connected with the first inlet of the boiler (10);
the second outlet of the boiler (10) is connected with the inlet of the medium pressure cylinder (12) through a reheat steam pipeline (62).
7. The coal-fired cogeneration unit according to claim 6, further comprising a feedwater regenerator set (15), a water side outlet of said feedwater regenerator set (15) being connected with a second inlet of said boiler (10);
the high-pressure cylinder (11) is connected with the water supply heat regenerator group (15) through a first steam extraction pipeline (71), and the medium-pressure cylinder (12) is connected with the water supply heat regenerator group (15) through a second steam extraction pipeline (72).
8. The coal-fired cogeneration unit of claim 7, further comprising a second heat grid heater (32), a hot side inlet of said second heat grid heater (32) being connected to an outlet of said intermediate pressure cylinder (12), a hot side outlet of said second heat grid heater (32) being connected to a water side inlet of said feedwater regenerator set (15); the cold side inlet and cold side outlet of the second heat network heater (32) are adapted to connect to a hot user.
9. The coal-fired cogeneration unit according to claim 8, further comprising a molten salt feedwater heater (16), wherein a hot side inlet of the molten salt feedwater heater (16) is connected to an outlet of the high temperature molten salt tank (13) through a sixth pipe (46), and wherein a sixth valve (460) is provided on the sixth pipe (46); the hot side outlet of the molten salt feed water heater (16) is connected with the inlet of the low-temperature molten salt tank (14);
the cold side inlet of the molten salt feed water heater (16) is connected with the hot side outlet of the second heat supply network heater (32) through a seventh pipeline (47), and a seventh valve (470) is arranged on the seventh pipeline (47); the cold side outlet of the molten salt feedwater heater (16) is connected to a second inlet of the boiler (10).
10. The coal-fired cogeneration unit according to any of claims 5-9, wherein the molten salt operation temperature zone of the low temperature molten salt tank (14) and/or the high temperature molten salt tank (13) is T, T satisfying 350 ℃ T550 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321653093.9U CN219974586U (en) | 2023-06-27 | 2023-06-27 | Coal-fired unit sliding temperature system and coal-fired cogeneration unit |
Applications Claiming Priority (1)
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