CN212250166U - Novel thermal power generating set thermodynamic system - Google Patents
Novel thermal power generating set thermodynamic system Download PDFInfo
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- CN212250166U CN212250166U CN202020246718.XU CN202020246718U CN212250166U CN 212250166 U CN212250166 U CN 212250166U CN 202020246718 U CN202020246718 U CN 202020246718U CN 212250166 U CN212250166 U CN 212250166U
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Abstract
The utility model relates to a novel thermal power generating set thermodynamic system, which comprises a first-stage turbine, a second-stage turbine and a condenser, wherein the first-stage turbine, the second-stage turbine and the condenser are respectively connected with a high pressure cylinder, a middle pressure cylinder and a low pressure cylinder of a steam turbine; the primary turbine extracts tertiary steam and is respectively connected with a No. 1 high-pressure feed water heater, a No. 2 high-pressure feed water heater and a No. 3 high-pressure feed water heater, and the deaerator is sequentially connected with the No. 3 high-pressure feed water heater, the No. 2 high-pressure feed water heater, the No. 1 high-pressure feed water heater and an inlet of a high-temperature economizer arranged in a flue of a vertical shaft of the boiler through a feed water pump and a pipeline; and the secondary turbine extracts tertiary steam to respectively enter a No. 4 low-pressure water supply heater, a No. 5 low-pressure water supply heater and a No. 6 low-pressure water supply heater, and the condenser is sequentially connected with the No. 6 low-pressure water supply heater, the No. 5 low-pressure water supply heater, the No. 4 low-pressure water supply heater and the deaerator through a condensate pump and a pipeline. The utility model discloses a steam turbine extraction energy's utilization has improved unit thermal cycle efficiency.
Description
Technical Field
The utility model relates to a thermal power generation technical field especially relates to a novel thermal generator set thermodynamic system.
Background
The method aims to realize sustainable development of a power generation system and accelerate the construction of the national energy-saving and emission-reducing targets. The thermodynamic system of a thermal generator set in China needs to be optimized and improved urgently, and the utilization efficiency of fossil energy is improved.
At present, the steam extraction superheat degree of a steam extraction system of a steam turbine of a conventional thermal power generating unit is overlarge, particularly the steam extraction superheat degree of a high-pressure cylinder even exceeds 100 ℃, and serious irreversible loss is caused. If the steam extraction of the steam turbine is abandoned, the loss of a cold source of the steam turbine is increased. Therefore, there is a need to optimize and perfect the steam extraction system of the steam turbine.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the technical problem who exists among the prior art at least. Therefore, the utility model provides a novel thermal power unit thermodynamic system utilizes the steam turbine to extract steam and drives small-size turbine or the method that the steam turbine generated electricity, realizes the step utilization of steam turbine extraction energy, has reduced irreversible loss, has improved thermal power unit thermodynamic cycle efficiency.
The utility model provides a technical scheme that its technical problem adopted is: the novel thermal power generating set thermodynamic system comprises a first-stage turbine connected with a high-pressure cylinder of a steam turbine, a second-stage turbine connected with a medium-pressure cylinder of the steam turbine and a condenser connected with a low-pressure cylinder of the steam turbine;
the primary turbine extracts tertiary steam and is respectively connected with a No. 1 high-pressure water supply heater, a No. 2 high-pressure water supply heater and a No. 3 high-pressure water supply heater, the exhaust of the primary turbine enters a deaerator, the deaerator is sequentially connected with the No. 3 high-pressure water supply heater, the No. 2 high-pressure water supply heater, the No. 1 high-pressure water supply heater and an inlet of a high-temperature economizer arranged in a shaft flue of the boiler through a water supply pump and a pipeline, and an outlet of the high-temperature economizer is connected with an inlet of a water-cooled wall of the;
the tertiary steam of second grade turbine extraction gets into No. 4 low pressure feedwater heaters, No. 5 low pressure feedwater heaters, No. 6 low pressure feedwater heaters respectively, and the exhaust of second grade turbine gets into the condenser, the condenser connects gradually through condensate pump and pipeline No. 6 low pressure feedwater heaters, No. 5 low pressure feedwater heaters, No. 4 low pressure feedwater heaters, oxygen-eliminating device.
The utility model provides a novel thermal generator set thermodynamic system's in a preferred embodiment, No. 1 high pressure feed water heater's hydrophobic entering No. 2 high pressure feed water heater, No. 2 high pressure feed water heater's hydrophobic entering No. 3 high pressure feed water heater, No. 3 high pressure feed water heater's hydrophobic entering deaerator.
The utility model provides a novel thermal generator set thermodynamic system's a preferred embodiment, still be equipped with No. 7 low pressure feedwater heaters between No. 6 low pressure feedwater heaters and the condensate pump, the steam turbine low-pressure cylinder extraction steam gets into No. 7 low pressure feedwater heaters.
The utility model provides a novel thermal power generating set thermodynamic system's a preferred embodiment, No. 4 low pressure feedwater heater's hydrophobic entering No. 5 low pressure feedwater heaters, No. 5 low pressure feedwater heaters's hydrophobic entering No. 6 low pressure feedwater heaters, No. 6 low pressure feedwater heaters's hydrophobic entering No. 7 low pressure feedwater heaters, No. 7 low pressure feedwater heaters's hydrophobic entering condenser.
The utility model provides a novel thermal generator set thermodynamic system's in a preferred embodiment, still be equipped with the low temperature economizer in the afterbody flue of boiler, the water inlet of low temperature economizer is connected pipeline between 7 low pressure feed water heater and 6 low pressure feed water heater, the delivery port of low temperature economizer is connected 4 low pressure feed water heater's delivery port.
In the preferred embodiment of the novel thermal power generating unit thermodynamic system provided by the utility model, the low-temperature economizer is arranged between the air preheater and the desulfurizing device.
The utility model provides a novel thermal generator set thermodynamic system's in a preferred embodiment, the tube side of external economizer is still connected to the delivery port of high temperature economizer, the water-cooling wall entry of boiler is connected to the delivery port of external economizer, the shell side import that steam turbine high-pressure cylinder extraction steam got into external economizer, the shell side exit linkage 2 high pressure feed water heater of external economizer.
In the utility model provides a novel thermal generator set thermodynamic system's a preferred embodiment, the one-level turbine is connected generator A, the second grade turbine is connected generator B.
Compared with the prior art, the utility model provides a novel thermal generator set thermodynamic system's beneficial effect is:
the utility model improves the steam work-doing efficiency by adding two stages of turbines; compared with the traditional mode of directly extracting steam from a main turbine to heat the feed water, the method has the advantages that the heat exchange temperature difference is reduced, the irreversible loss is reduced from the thermodynamic perspective, and the overall cycle efficiency of the unit is improved;
the utility model increases the water supply temperature by adding an external economizer, further reduces the heat exchange temperature difference between the boiler water supply and the furnace flue gas, and further reduces the generation of irreversible loss;
thirdly, the utility model reduces the exhaust gas temperature of the boiler to a certain extent by adding the low-temperature economizer, reduces the pollution of the unit to the environment, improves the generating efficiency of the unit, and realizes the main purposes of energy conservation and emission reduction of the thermal generator set;
four, the utility model discloses based on "the temperature is abundant to mouthful, energy step utilizes" principle, seeks the energy transfer unit that the temperature of machine stove both sides was to mouthful, utilizes the small-size turbine of steam turbine extraction drive or the steam turbine method of generating electricity, realizes the step utilization of steam turbine extraction energy, has reduced irreversible loss, has improved thermal power generating unit thermodynamic cycle efficiency, can wide application in large-scale coal-fired generating set, not only is applicable to newly-built boiler unit, also is applicable to current boiler unit simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
fig. 1 is a schematic structural diagram of a thermodynamic system of a novel thermal generator set provided by the present invention;
FIG. 2 is a schematic view of the connection of the primary turbine provided in FIG. 1 in a system;
FIG. 3 is a schematic view of the connection of the two-stage turbine provided in FIG. 1 in a system;
FIG. 4 is a diagram of the connection structure of the external economizer provided in FIG. 1 in the system;
FIG. 5 is a diagram of a connection structure of the low-temperature economizer provided in FIG. 1 in a system;
in the figure: 1 a-a water-cooled wall, 1 b-a split screen superheater, 1 c-a horizontal flue superheater, 1 d-a reheater, 1 f-a high-temperature economizer, 1 g-an air preheater, 1 e-a low-temperature economizer, 1 h-a desulfurizer, 2 a-a steam turbine high-pressure cylinder, 2 b-a steam turbine medium-pressure cylinder, 2 c-a steam turbine low-pressure cylinder, 2 d-a first-stage turbine, 2 e-a second-stage turbine, 3 i-an external economizer, 3a-1 high-pressure feed water heater, 3b-2 high-pressure feed water heater, 3c-3 high-pressure feed water heater, 3d-4 low-pressure feed water heater, 3e-5 low-pressure feed water heater, 3f-6 low-pressure feed water heater, and 3g-7 low-pressure feed water heater, 3 h-a deaerator, 4 a-a water feeding pump, 4B-a condensate pump, 5 a-a generator A, 5B-a generator B, 5 c-a turbine generator, 6 a-a condenser, 6B-a low-temperature economizer regulating valve, 6 c-a main steam regulating valve, 6 d-a reheat steam regulating valve, 7-a tail flue and 8-a boiler.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply 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 limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In this embodiment, a boiler and a steam turbine are described in detail with reference to fig. 1, which includes the following details:
referring to fig. 1, a water wall 1a and a split-screen superheater 1b are arranged in a boiler 8, a horizontal flue superheater 1c and a reheater 1d are arranged in a horizontal flue of the boiler, a high-temperature economizer 1f is arranged in a vertical flue of the boiler, and an air preheater 1g and a desulfurization device 1h are arranged in a tail flue of the boiler.
The steam turbine comprises a steam turbine high pressure cylinder 2a, a steam turbine intermediate pressure cylinder 2b and a steam turbine low pressure cylinder 2c, and the steam turbine is connected with a steam turbine generator 5 c.
The inlet of the water wall 1a is connected with the outlet of an external economizer 3i, the outlet is connected with the inlet of a split screen superheater 1b, the outlet of the split screen superheater 1b is connected with the inlet of a horizontal flue superheater 1c, the horizontal flue superheater 1c adjusts the steam flow entering a high-pressure steam turbine cylinder 2a through a main steam adjusting valve 6c on a main steam pipeline, the main steam enters a reheater 1d through the outlet of the high-pressure steam turbine cylinder 2a, the reheater 1d adjusts the steam flow entering a medium-pressure steam turbine cylinder 2b through a reheated steam adjusting valve 6d on a reheated steam pipeline, and the reheated steam enters the low-pressure steam turbine cylinder 2c through the outlet of the medium-pressure steam turbine cylinder 2.
Based on the boiler and the steam turbine, please refer to fig. 1 again, the thermal system of the novel thermal power generating unit of the embodiment includes a first turbine 2d connected with a high pressure cylinder 2a of the steam turbine, a second turbine 2e connected with a medium pressure cylinder 2b of the steam turbine, and a condenser 6a connected with a low pressure cylinder 2c of the steam turbine;
referring to fig. 1 and 2, the primary turbine 2d extracts tertiary steam and is respectively connected to a No. 1 high-pressure feed water heater 3a, a No. 2 high-pressure feed water heater 3b, and a No. 3 high-pressure feed water heater 3c, and exhaust gas of the primary turbine 2d enters a deaerator 3h, the deaerator 3h is sequentially connected with the No. 3 high-pressure feed water heater 3c, the No. 2 high-pressure feed water heater 3b, the No. 1 high-pressure feed water heater 3a, and an inlet of a high-temperature economizer 1f arranged in a shaft flue of a boiler through a feed water pump 4a and a pipeline, an outlet of the high-temperature economizer 1f is connected with an inlet of a water-cooled wall 1a of the boiler, and the primary turbine 2d is connected.
Further, the drainage of No. 1 high pressure feedwater heater 3a gets into No. 2 high pressure feedwater heater 3b, the drainage of No. 2 high pressure feedwater heater 3b gets into No. 3 high pressure feedwater heater 3c, the drainage of No. 3 high pressure feedwater heater 3c gets into the oxygen-eliminating device 3 h.
Referring to fig. 1 and 3, the secondary turbine 2e extracts tertiary steam and respectively enters a No. 4 low-pressure feed water heater 3d, a No. 5 low-pressure feed water heater 3e, and a No. 6 low-pressure feed water heater 3f, and exhaust gas of the secondary turbine 2e enters a condenser 6a, the condenser 6a is sequentially connected with the No. 6 low-pressure feed water heater 3f, the No. 5 low-pressure feed water heater 3e, the No. 4 low-pressure feed water heater 3d, and a deaerator 3h through a condensate pump 4B and a pipeline, and the secondary turbine 3e is connected with a generator B5B.
Furthermore, a No. 7 low-pressure feed water heater 3g is arranged between the No. 6 low-pressure feed water heater 3f and the condensate pump 4b, and the steam turbine low-pressure cylinder 2c extracts steam to enter the No. 7 low-pressure feed water heater 3 g.
Furthermore, the drained water of the No. 4 low-pressure feed water heater 3d enters a No. 5 low-pressure feed water heater 3e, the drained water of the No. 5 low-pressure feed water heater 3e enters a No. 6 low-pressure feed water heater 3f, the drained water of the No. 6 low-pressure feed water heater 3f enters a No. 7 low-pressure feed water heater 3g, and the drained water of the No. 7 low-pressure feed water heater 3g enters a condenser 6 a.
This embodiment adds one-level turbine 2d and second grade turbine 2e at steam turbine high pressure cylinder 2a, low pressure cylinder 2b respectively, has improved steam work efficiency, and the steam of extracting one-level turbine 2d and second grade turbine 2e simultaneously heats the feedwater, compares traditional direct mode of extracting steam from the main steam turbine and heating the feedwater, has reduced the heat transfer difference in temperature, has improved the whole circulation efficiency of unit.
Referring to fig. 1 and 5, further, a low-temperature economizer 1e is further disposed in the tail flue 7 of the boiler 8, a water inlet of the low-temperature economizer 1e is connected to a pipeline between the No. 7 low-pressure feed water heater 3g and the No. 6 low-pressure feed water heater 3f, and a water outlet of the low-temperature economizer 1e is connected to a water outlet of the No. 4 low-pressure feed water heater 3 d.
Preferably, the low-temperature economizer 1e is provided between the air preheater 1g and the desulfurizer 1 h.
In the embodiment, the mode of additionally arranging the low-temperature economizer 1e is adopted, the exhaust gas temperature of the boiler is reduced to a certain extent, the pollution of a unit to the environment is reduced, the generating efficiency of the unit is improved, and the main purposes of energy conservation and emission reduction of the thermal generator set are achieved.
Referring to fig. 1 and 4, further, a water outlet of the high-temperature economizer 1f is further connected to a tube pass of an external economizer 3i, a water outlet of the external economizer 3i is connected to an inlet of a water wall 1a of a boiler, the steam turbine high-pressure cylinder 2a extracts steam to enter a shell pass inlet of the external economizer 3i, and a shell pass outlet of the external economizer 3i is connected to a high-pressure feed water heater 3b No. 2.
In the embodiment, the water supply temperature is improved by additionally arranging the external economizer 3i, so that the heat exchange temperature difference between the boiler water supply and the hearth flue gas is further reduced, and the generation of irreversible loss is further reduced.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes made by the present specification can be changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a novel thermal generator set thermodynamic system which characterized in that: the system comprises a first-stage turbine connected with a high-pressure cylinder of a steam turbine, a second-stage turbine connected with a medium-pressure cylinder of the steam turbine and a condenser connected with a low-pressure cylinder of the steam turbine;
the primary turbine extracts tertiary steam and is respectively connected with a No. 1 high-pressure water supply heater, a No. 2 high-pressure water supply heater and a No. 3 high-pressure water supply heater, the exhaust of the primary turbine enters a deaerator, the deaerator is sequentially connected with the No. 3 high-pressure water supply heater, the No. 2 high-pressure water supply heater, the No. 1 high-pressure water supply heater and an inlet of a high-temperature economizer arranged in a shaft flue of the boiler through a water supply pump and a pipeline, and an outlet of the high-temperature economizer is connected with an inlet of a water-cooled wall of the;
the tertiary steam of second grade turbine extraction gets into No. 4 low pressure feedwater heaters, No. 5 low pressure feedwater heaters, No. 6 low pressure feedwater heaters respectively, and the exhaust of second grade turbine gets into the condenser, the condenser connects gradually through condensate pump and pipeline No. 6 low pressure feedwater heaters, No. 5 low pressure feedwater heaters, No. 4 low pressure feedwater heaters, oxygen-eliminating device.
2. A novel thermal generator set thermodynamic system as claimed in claim 1, wherein: the drainage of the No. 1 high-pressure water supply heater enters the No. 2 high-pressure water supply heater, the drainage of the No. 2 high-pressure water supply heater enters the No. 3 high-pressure water supply heater, and the drainage of the No. 3 high-pressure water supply heater enters the deaerator.
3. A novel thermal generator set thermodynamic system as claimed in claim 1, wherein: and a No. 7 low-pressure water supply heater is also arranged between the No. 6 low-pressure water supply heater and the condensate pump, and the steam extracted by the steam turbine low-pressure cylinder enters the No. 7 low-pressure water supply heater.
4. A novel thermal generator set thermodynamic system as claimed in claim 3, wherein: the drainage of No. 4 low pressure feedwater heater gets into No. 5 low pressure feedwater heater, the drainage of No. 5 low pressure feedwater heater gets into No. 6 low pressure feedwater heater, the drainage of No. 6 low pressure feedwater heater gets into No. 7 low pressure feedwater heater, the drainage of No. 7 low pressure feedwater heater gets into the condenser.
5. A novel thermal generator set thermodynamic system as claimed in claim 3, wherein: and a low-temperature economizer is further arranged in a tail flue of the boiler, a water inlet of the low-temperature economizer is connected with a pipeline between the No. 7 low-pressure water supply heater and the No. 6 low-pressure water supply heater, and a water outlet of the low-temperature economizer is connected with a water outlet of the No. 4 low-pressure water supply heater.
6. A novel thermal generator set thermodynamic system as claimed in claim 5, wherein: the low-temperature economizer is arranged between the air preheater and the desulfurization device.
7. The novel thermal power generating unit thermodynamic system as claimed in any one of claims 1 to 6, wherein: the water outlet of the high-temperature economizer is further connected with a tube pass of the external economizer, the water outlet of the external economizer is connected with a water-cooled wall inlet of the boiler, the high-pressure cylinder of the steam turbine extracts steam to enter a shell pass inlet of the external economizer, and a shell pass outlet of the external economizer is connected with a No. 2 high-pressure feed water heater.
8. The novel thermal power generating unit thermodynamic system as claimed in any one of claims 1 to 6, wherein: the first-stage turbine is connected with the generator A, and the second-stage turbine is connected with the generator B.
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| CN202020246718.XU CN212250166U (en) | 2020-03-03 | 2020-03-03 | Novel thermal power generating set thermodynamic system |
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| CN202020246718.XU CN212250166U (en) | 2020-03-03 | 2020-03-03 | Novel thermal power generating set thermodynamic system |
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