CN212777568U - Step heating system of 500MW and above air cooling unit - Google Patents
Step heating system of 500MW and above air cooling unit Download PDFInfo
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- CN212777568U CN212777568U CN202021514046.2U CN202021514046U CN212777568U CN 212777568 U CN212777568 U CN 212777568U CN 202021514046 U CN202021514046 U CN 202021514046U CN 212777568 U CN212777568 U CN 212777568U
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Abstract
The utility model provides a 500MW reaches above air cooling unit step heating system relates to thermal power generation technical field. The step heating system of the air cooling unit of 500MW or above comprises a steam turbine medium pressure cylinder, a steam turbine low pressure cylinder, an air cooling island, a first steam exhaust device of the steam turbine, a second steam exhaust device of the steam turbine, a first steam booster, a first heat supply network condenser, a second heat supply network condenser and heat supply network users. The technical effects that the exhaust steam of the large air-cooling heat supply unit is used for heat supply, the heat in the exhaust steam is recovered, the heat supply steam extraction is replaced, the heat supply coal consumption is reduced, the energy gradient utilization is realized, and the energy is saved and the emission is reduced are achieved.
Description
Technical Field
The utility model relates to a heat supply technical field particularly, relates to 500MW and above air cooling unit step heating system.
Background
In general, a thermal power plant adopts high-parameter heat supply extraction steam to directly heat low-temperature heat supply network circulating water, so that energy waste is caused. The exhaust steam of the steam turbine belongs to steam with lower temperature and higher heat value, and the exhaust steam contains a large amount of latent heat. To complete the thermodynamic cycle, the exhaust must be condensed into water and re-enter the thermodynamic system, with all of the heat in the exhaust lost to the cold end.
At present, the environment is more and more emphasized, and dispersed small boilers with large pollution are gradually replaced by a centralized heating mode of cogeneration; heat supply is a social responsibility which must be fulfilled by each heat supply enterprise as a civil engineering, and a phenomenon of high coal price and low heat price exists in many places; with the acceleration of the urbanization process, the scale of the regional cogeneration is continuously increased, and a plurality of thermal power plants cannot meet the increasing heat load requirement; meanwhile, the development and improvement commission warming project proposes: the low-grade waste heat resources are fully recycled and used for heating in cities and towns, the energy utilization efficiency is improved, the coal consumption is reduced, and the air quality is improved.
In order to improve the heat supply capacity of a thermal power plant, ensure the increasing heat load and guarantee the living needs of people; and responding to the call, recovering low-grade waste heat, and saving energy and reducing emission. The existing waste steam step recovery technology comprises an absorption heat pump, high back pressure transformation and a turbine waste heat recovery technology; the waste heat recovery technology of the steam booster aims at the unit which integrally operates in a single unit, a single steam exhaust pipeline and an air cooling island. In the scheme, the heat supply unit with the steam exhaust amount not particularly large can basically use up the steam exhaust and can basically recover heat. For large air cooling heat supply units with large steam discharge of steam turbines, particularly units of 500MW and above, a large amount of dead steam cannot be used in the scheme, so that waste heat cannot be recovered, the loss of cold ends is large, the large heat supply units do not have waste heat utilization conditions, and only high-parameter steam extraction heat supply can be used.
Therefore, the exhaust steam of the large-scale air cooling unit is used for heat supply, the heat in the exhaust steam is recycled, the heat supply steam extraction is replaced, the heat supply coal consumption is reduced, the gradient utilization of energy of the air cooling unit of 500MW and above, energy conservation and emission reduction are realized, and the important technical problems to be solved by technical personnel in the field are provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a 500MW and above air cooling unit step heating system to alleviate the technical problem that large-scale air cooling unit does not possess exhaust steam waste heat utilization among the prior art.
In a first aspect, an embodiment of the utility model provides a step heating system of 500MW and above air cooling unit, including a steam turbine medium pressure cylinder, a steam turbine low pressure cylinder, an air cooling island, a first turbine, a first heat supply network condenser, a second heat supply network condenser and a heat supply network user;
the steam turbine low-pressure cylinder comprises two or more steam exhaust devices, each steam exhaust device comprises a first steam exhaust device of the steam turbine and a second steam exhaust device of the steam turbine, a first steam exhaust port of the steam turbine low-pressure cylinder is connected with the first steam exhaust device of the steam turbine, a second steam exhaust port of the steam turbine low-pressure cylinder is connected with the second steam exhaust device of the steam turbine, and the operation back pressure of the second steam exhaust device of the steam turbine is greater than that of the first steam exhaust device of the steam turbine in the heating period;
the first steam exhaust device of the steam turbine is connected with the air cooling island through a steam exhaust pipeline, and the second steam exhaust device of the steam turbine is connected with the air cooling island through a steam exhaust pipeline;
the air cooling fans of the air cooling island can control the operation back pressure of the first steam exhaust device and the second steam exhaust device in different regions;
a steam outlet of the steam turbine intermediate pressure cylinder is provided with a heat supply steam extraction main pipe, and the heat supply steam extraction main pipe is connected with a heat supply network head station internal heat network heater;
the steam exhaust pipeline of the first steam exhaust device of the steam turbine is also connected with a steam suction port of the first steam booster, the heat supply steam extraction main pipe is connected with a power steam port of the first steam booster, and a steam exhaust port of the first steam booster is connected with the first heat supply network condenser;
the first heat supply network condenser and the second heat supply network condenser are connected in series, and an exhaust pipeline of a second exhaust device of the steam turbine is connected with the second heat supply network condenser;
the first heat supply network condenser and the second heat supply network condenser can be connected with the heat supply network users through heat supply network pipelines;
the first steam extraction device of steam turbine with be provided with first valve between the first turbine that increases, steam turbine second steam extraction device with set up second valve in addition between the second heat supply network condenser, heat supply steam extraction female pipe with be provided with the third valve between the first turbine that increases.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a bypass for short-circuiting the first heat-supply-network condenser is disposed on the heat-supply-network pipeline, and a bypass valve is disposed on the bypass;
and a fourth valve for controlling the opening and closing of the first heat supply network condenser is arranged on the heat supply network pipeline, and the fourth valve is connected with the bypass valve in parallel.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the step heating system of the 500MW or more air cooling unit further includes a second turbine and a third heat-supply-network condenser;
the heat supply steam extraction main pipe is connected with a power steam port of the second steam turbine, a steam exhaust pipeline of a second steam exhaust device of the steam turbine is connected with a steam suction port of the second steam turbine, and a steam exhaust port of the second steam turbine is connected with the third heat supply network condenser;
the third heat supply network condenser, the second heat supply network condenser and the first heat supply network condenser are connected in series.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a fifth valve is disposed between the second steam exhaust device steam exhaust pipeline of the steam turbine and the second steam booster;
and a sixth valve is arranged between the heat supply steam extraction main pipe and the second steam booster.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the step heating system of the 500MW or above air cooling unit further includes a heat supply steam extraction main pipe and a heat supply network heater;
the heat supply steam extraction main pipe and the heat supply network heater are both connected with the heat supply steam extraction main pipe;
the number of the heat supply network heaters is more than or equal to one.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the above-mentioned heat supply network heater and the heat supply steam extraction main pipe close to the machine and the heat supply steam extraction main pipe are provided with a seventh valve therebetween.
In combination with the first aspect, embodiments of the present invention provide a possible implementation manner of the first aspect, wherein, the first steam turbine and the second steam turbine have both power steam ports, which are connected to the heat supply steam extraction main pipe.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the first heat-supply-network condenser is connected in series with the second heat-supply-network condenser, and the third heat-supply-network condenser is connected in series with the heat-supply-network heater.
Has the advantages that:
the utility model provides a step heating system of 500MW and above air cooling units, which comprises a turbine medium pressure cylinder, a turbine low pressure cylinder, an air cooling island, a first turbine, a first heat supply network condenser, a second heat supply network condenser and a heat supply network user; the low-pressure steam turbine cylinder comprises two or more steam exhaust devices, each steam exhaust device comprises a first steam exhaust device of the steam turbine and a second steam exhaust device of the steam turbine, a first steam exhaust port of the low-pressure steam turbine cylinder is connected with the first steam exhaust device of the steam turbine, a second steam exhaust port of the low-pressure steam turbine cylinder is connected with the second steam exhaust device of the steam turbine, and the operation backpressure of the second steam exhaust device of the steam turbine is greater than that of the first steam exhaust device of the steam turbine in the heating period; the first steam exhaust device of the steam turbine is connected with the air cooling island through a steam exhaust pipeline, and the second steam exhaust device of the steam turbine is connected with the air cooling island through a steam exhaust pipeline; the air cooling fans of the air cooling island can control the operation back pressure of the first steam exhaust device and the second steam exhaust device in different regions; a steam outlet of the steam turbine intermediate pressure cylinder is provided with a heat supply steam extraction main pipe, and the heat supply steam extraction main pipe is connected with a heat supply network head station internal heat network heater; the exhaust pipeline of the first exhaust device of the steam turbine is also connected with a suction steam port of a first steam booster, a heat supply steam extraction main pipe is connected with a power steam port of the first steam booster, and an exhaust port of the first steam booster is connected with a first heat supply network condenser; the first heat supply network condenser and the second heat supply network condenser are connected in series, and an exhaust pipeline of a second exhaust device of the steam turbine is connected with the second heat supply network condenser; a first valve is arranged between the first steam exhaust device and the first steam booster of the steam turbine, a second valve is arranged between the second steam exhaust device of the steam turbine and the second heat supply network condenser, and a third valve is arranged between the heat supply steam extraction main pipe and the first steam booster.
Specifically, in the heating period, if the requirement on heat supply parameters is low, a first valve and a third valve are sequentially opened, a heat supply steam extraction main pipe is used as power steam, exhaust steam exhausted from a first steam exhaust device of a steam turbine is injected through a first steam turbine, generated mixed steam is used as a first-stage heat source, and heat supply network circulating water in a heat supply network pipeline is heated, so that first-stage heat supply is realized; when the heat supply demand is increased, the second valve is opened, the exhaust steam discharged by the second steam exhaust device of the steam turbine is used as a second-stage heat source and enters the second heat supply network condenser to heat the heat supply network circulating water in the heat supply network pipeline, and the working back pressure of the second steam exhaust device of the steam turbine is greater than the steam exhaust pressure of the first steam booster, so that the temperature of the heat supply network circulating water can be further increased, and the second-stage heat supply is realized; in the process of heat supply, the exhaust steam discharged by the first steam discharging device and the second steam discharging device of the steam turbine does not enter the air cooling island for cooling, but enters the heat supply network condenser for heating the circulating water of the heat supply network, so that the large-scale air cooling unit can utilize the waste heat of the exhaust steam to perform heat supply work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a working schematic diagram of a step heating system of 500MW and above air cooling units provided by the embodiment of the present invention.
Icon:
1-a steam turbine intermediate pressure cylinder; 2-low pressure cylinder of steam turbine; 3-air cooling island; 4-a first exhaust device of the steam turbine; 5-a second steam exhaust device of the steam turbine; 6-a first steam booster; 7-a first heat supply network condenser; 8-a second heat supply network condenser; 9-a heat supply network user; 10-heat supply network piping; 11-a first valve; 12-a second valve; 13-a third valve; 14-a bypass channel; 15-a bypass valve; 16-a fourth valve; 17-a second turbine; 18-a third heat network condenser; 19-a fifth valve; 20-a sixth valve; 21-machine-in heat supply steam extraction main pipe; 22-a heat net heater; 23-a seventh valve; 24-heat supply steam extraction main pipe.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Referring to fig. 1, the embodiment provides a step heating system of an air cooling unit of 500MW or more, which includes a turbine intermediate pressure cylinder 1, a turbine low pressure cylinder 2, an air cooling island 3, a turbine first steam exhaust device 4, a turbine second steam exhaust device 5, a first steam booster 6, a first heat supply network condenser 7, a second heat supply network condenser 8 and a heat supply network user 9; a first steam outlet of the steam turbine low-pressure cylinder 2 is connected with a first steam exhaust device 4 of the steam turbine, a second steam outlet of the steam turbine low-pressure cylinder 2 is connected with a second steam exhaust device 5 of the steam turbine, and the operation backpressure of the second steam exhaust device 5 of the steam turbine is greater than the operation backpressure of the first steam exhaust device 4 of the steam turbine; the first steam exhaust device of the steam turbine is connected with the air cooling island through a first steam exhaust device steam exhaust pipeline, and the second steam exhaust device of the steam turbine is connected with the air cooling island through a second steam exhaust device steam exhaust pipeline; the running back pressure of the first steam exhaust device and the second steam exhaust device is controlled by an air cooling fan of the air cooling island, and the air cooling island fans can be controlled in different regions; the exhaust pipeline of the first exhaust device 4 of the steam turbine is also connected with the suction steam port of the first steam booster 6, the heat supply steam extraction main pipe 24 is connected with the power steam port of the first steam booster 6, and the exhaust port of the first steam booster 6 is connected with the first heat supply network condenser 7; the first heat supply network condenser 7 and the second heat supply network condenser 8 are connected in series, and a steam exhaust pipeline of the second steam exhaust device 5 of the steam turbine is connected with the second heat supply network condenser 8; the first heat supply network condenser 7 and the second heat supply network condenser 8 can be connected with a heat supply network user 9 through a heat supply network pipeline 10; a first valve 11 is arranged between the exhaust pipeline of the first exhaust device 4 of the steam turbine and the first steam booster 6, a second valve 12 is arranged between the exhaust pipeline of the second exhaust device 5 of the steam turbine and the second heat supply network condenser 8, and a third valve 13 is arranged between the heat supply extraction main pipe 24 and the first steam booster 6.
In the heating period, if the requirement of heat supply parameters is low, the first valve 11 and the third valve 13 are opened in sequence, the heat supply steam extraction main pipe 24 is used as power steam, exhaust steam exhausted from the first steam exhaust device 4 of the steam turbine is injected through the first steam increasing machine 6, generated mixed steam is used as a first-stage heat source, and heat supply network circulating water in the heat supply network pipeline 10 is heated, so that first-stage heat supply is realized; when the heat supply demand is increased, the second valve 12 is opened, the exhaust steam discharged by the second steam exhaust device 5 of the steam turbine is used as a second-stage heat source and enters the second heat supply network condenser 8 to heat the heat supply network circulating water in the heat supply network pipeline 10, and the working back pressure of the second steam exhaust device 5 of the steam turbine is greater than the steam exhaust pressure of the first steam booster 6, so that the temperature of the heat supply network circulating water can be further increased, and the second-stage heat supply is realized; when the heat supply demand is increased again, the fifth valve 19 and the sixth valve 20 are opened in sequence, the heat supply steam extraction main pipe 24 is used as power steam, exhaust steam exhausted from the second steam exhaust device 5 of the steam turbine is injected through the second steam increasing machine 17, generated mixed steam is used as a third-level heat source and enters the third heat supply network condenser 18 to heat supply network circulating water in the heat supply network pipeline 10, and the temperature of the heat supply network circulating water can be further increased because the steam exhaust pressure of the second steam increasing machine 17 is greater than the pressure in the third heat supply network condenser 18, so that third-level heat supply is realized; in the process of heat supply, the exhaust steam discharged by the first steam discharging device 4 and the second steam discharging device 5 of the steam turbine does not enter the air cooling island 3 for cooling, but enters the heat supply network pipeline 10 for heating the circulating water of the heat supply network, so that the large-scale air cooling unit can utilize the waste heat of the exhaust steam to perform heat supply work.
During the heat supply period, the operation back pressure of the second steam exhaust device 5 of the steam turbine is greater than that of the first steam exhaust device 4 of the steam turbine; during periods of non-heating, the operating back pressure of the second turbine exhaust 5 is equal to the operating back pressure of the first turbine exhaust 4.
It should be noted that, in the working process, when the requirement on heat supply parameters is low, the heat supply steam extraction main pipe 24 is used as power steam, the exhaust steam discharged from the first steam exhaust device 4 of the steam turbine is injected through the first steam booster 6, the generated mixed steam is used as a first-stage heat source and enters the first heat supply network condenser 7 for heat supply, the back pressure of the second steam exhaust device 5 of the steam turbine is the same as that of the first steam exhaust device 4 of the steam turbine, and the exhaust steam discharged from the second steam exhaust device 5 of the steam turbine is cooled through the air cooling island 3; when the heat supply demand is increased, when the steam exhaust pressure of the first steam increasing machine 6 is lower than the saturation pressure corresponding to the circulating water return temperature of the heat supply network, the first steam increasing machine 6 stops working, at the moment, the exhaust steam of the first steam exhaust device 4 of the steam turbine is cooled through the air cooling island 3, and the second steam exhaust device of the steam turbine heats up by 5 liters of back pressure. Through the arrangement, the large-scale air cooling unit can utilize the waste steam and the waste heat to perform heat supply work.
It should be further noted that the operation back pressure of the first steam exhaust device 4 of the steam turbine and the second steam exhaust device 5 of the steam turbine is controlled by the air cooling fans of the air cooling island 3, and the air cooling fans of the air cooling island 3 can be controlled in different sections, which is the prior art and is not described herein again.
The working principle of the first steam turbine 6 and the second steam turbine 17 is to use high-parameter steam as power steam, inject low-parameter steam, and generate new steam meeting the user requirements through the steam turbines.
In the alternative of this embodiment, a bypass channel 14 for short-circuiting the first heat supply network condenser 7 is provided on the heat supply network pipeline 10, and a bypass valve 15 is provided on the bypass channel 14; the heat supply network pipeline 10 is provided with a fourth valve 16 for controlling the opening and closing of the first heat supply network condenser 7, and the fourth valve 16 is connected with the bypass valve 15 in parallel.
Specifically, when the exhaust pressure of the first steam booster 6 is lower than the saturation pressure corresponding to the return water temperature of the heat supply network circulating water or the first heat supply network condenser 7 fails, the fourth valve 16 may be closed, and then the bypass valve 15 may be opened, so that the heat supply network circulating water in the heat supply network pipeline 10 may flow to the second heat supply network condenser 8 through the bypass channel 14.
In the optional scheme of this embodiment, the stepped heating system of 500MW or more air cooling units further includes a second turbine 17 and a third heat-supply-network condenser 18; the heat supply steam extraction main pipe 24 is connected with a power steam port of the second steam booster 17, a steam exhaust pipeline of the second steam exhaust device 5 of the steam turbine is connected with a steam suction port of the second steam booster 17, and a steam exhaust port of the second steam booster 17 is connected with a third heat supply network condenser 18; the third heat supply network condenser 18, the second heat supply network condenser 8 and the first heat supply network condenser 7 are connected in series.
In an alternative of this embodiment, a fifth valve 19 is arranged between the second steam exhaust 5 and the second steam booster 17; a sixth valve 20 is arranged between the heat supply steam extraction main pipe 24 and the second steam booster 17.
When the heat supply demand is increased again, the fifth valve 19 and the sixth valve 20 are opened, the heat supply extraction steam of the heat supply extraction steam main pipe 24 is used as power, the exhaust steam discharged by the second steam exhaust device 5 of the steam turbine is injected through the second steam increasing machine 17, the generated new steam meeting the heat supply network demand is used as a third-level heat source, and enters the third heat supply network condenser 18 to heat the heat supply network circulating water, so that the temperature of the heat supply network circulating water is further increased, and the third-level heat supply is realized.
In the optional scheme of the embodiment, the step heating system of the air cooling unit of 500MW or more further comprises a machine-approaching heat supply steam extraction main pipe 21 and a heat supply network heater 22; the heat supply steam extraction main pipe 21 and the heating network heater are both connected with the heat supply steam extraction main pipe 24.
In an alternative of this embodiment, a seventh valve 23 is provided between the heating network heater 22 and the heating steam extraction main pipe 24.
When the heat supply demand improves once more, open seventh valve 23, heat supply extraction steam in the heat supply extraction steam main pipe 21 near the machine is as the fourth grade heat source, through heat supply network heater 22, continues to heat up for the heat supply network circulating water in heat supply network pipeline 10, reaches the highest value that the heat supply can to realize fourth grade heat supply.
In the alternative of the embodiment, the power steam ports of the first steam turbine 6 and the second steam turbine 17 are both connected with the heat supply steam extraction main pipe 24; a third valve 13 is arranged between the first steam booster 6 and the heat supply steam extraction main pipe 24; a sixth valve 20 is arranged between the first steam booster 6 and the heat supply steam extraction main pipe 24.
Moreover, the heat supply steam extraction main pipe 21 can also provide power steam for the first steam increasing machine 6 and the second steam increasing machine 17, and the technical personnel in the field can set the heat supply steam extraction main pipe according to the requirements.
In an alternative of this embodiment, the first heat supply network condenser 7, the second heat supply network condenser 8, the third heat supply network condenser 18 and the heat supply network heater 22 are connected in series in sequence.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (8)
1. The utility model provides a step heating system of 500MW and above air cooling unit which characterized in that includes: the system comprises a steam turbine medium pressure cylinder, a steam turbine low pressure cylinder, an air cooling island, a first turbine, a first heat supply network condenser, a second heat supply network condenser and a heat supply network user;
the steam turbine low-pressure cylinder comprises two or more steam exhaust devices, each steam exhaust device comprises a first steam exhaust device of the steam turbine and a second steam exhaust device of the steam turbine, a first steam exhaust port of the steam turbine low-pressure cylinder is connected with the first steam exhaust device of the steam turbine, a second steam exhaust port of the steam turbine low-pressure cylinder is connected with the second steam exhaust device of the steam turbine, and the operation back pressure of the second steam exhaust device of the steam turbine is greater than that of the first steam exhaust device of the steam turbine in the heating period;
the first steam exhaust device of the steam turbine is connected with the air cooling island through a steam exhaust pipeline, and the second steam exhaust device of the steam turbine is connected with the air cooling island through a steam exhaust pipeline;
the air cooling fans of the air cooling island can control the operation back pressure of the first steam exhaust device and the second steam exhaust device in different regions;
a steam outlet of the steam turbine intermediate pressure cylinder is provided with a heat supply steam extraction main pipe, and the heat supply steam extraction main pipe is connected with a heat supply network head station internal heat network heater;
the steam exhaust pipeline of the first steam exhaust device of the steam turbine is also connected with a steam suction port of the first steam booster, the heat supply steam extraction main pipe is connected with a power steam port of the first steam booster, and a steam exhaust port of the first steam booster is connected with the first heat supply network condenser;
the first heat supply network condenser and the second heat supply network condenser are connected in series, and an exhaust pipeline of a second exhaust device of the steam turbine is connected with the second heat supply network condenser;
the first heat supply network condenser and the second heat supply network condenser can be connected with the heat supply network users through heat supply network pipelines;
the first steam extraction device of steam turbine with be provided with first valve between the first turbine that increases, steam turbine second steam extraction device with set up second valve in addition between the second heat supply network condenser, heat supply steam extraction female pipe with be provided with the third valve between the first turbine that increases.
2. The 500MW and above air cooling unit step heating system according to claim 1, wherein a bypass for short-circuiting the first heat supply network condenser is provided on the heat supply network pipeline, and a bypass valve is provided on the bypass;
and a fourth valve for controlling the opening and closing of the first heat supply network condenser is arranged on the heat supply network pipeline, and the fourth valve is connected with the bypass valve in parallel.
3. The 500MW and above air cooling unit step heating system according to claim 2, further comprising a second turbine and a third heat supply network condenser;
the heat supply steam extraction main pipe is connected with a power steam port of the second steam turbine, a steam exhaust pipeline of a second steam exhaust device of the steam turbine is connected with a steam suction port of the second steam turbine, and a steam exhaust port of the second steam turbine is connected with the third heat supply network condenser;
the third heat supply network condenser, the second heat supply network condenser and the first heat supply network condenser are connected in series.
4. The 500MW and above air cooling unit step heating system according to claim 3, wherein a fifth valve is provided between the second steam exhaust device steam exhaust pipeline of the steam turbine and the second steam booster;
and a sixth valve is arranged between the heat supply steam extraction main pipe and the second steam booster.
5. The 500MW and above air cooling unit step heating system of claim 4, further comprising a machine-approaching heat supply steam extraction main pipe and a heat supply network heater;
the heat supply steam extraction main pipe and the heat supply network heater are both connected with the heat supply steam extraction main pipe;
the number of the heat supply network heaters is more than or equal to one.
6. The 500MW and above air cooling unit step heating system according to claim 5, wherein a seventh valve is provided between the heat supply network heater and both the on-line heat supply steam extraction main pipe and the heat supply steam extraction main pipe.
7. The 500MW and above air cooling unit step heating system of claim 6, wherein the power steam ports of both the first and second steam boosters are connected to the heating steam extraction main pipe.
8. The 500MW and above air cooling unit step heating system according to claim 7, wherein the first heat supply network condenser, the second heat supply network condenser, the third heat supply network condenser and the heat supply network heater are connected in series in sequence.
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| CN202021514046.2U CN212777568U (en) | 2020-07-28 | 2020-07-28 | Step heating system of 500MW and above air cooling unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113882918A (en) * | 2021-09-09 | 2022-01-04 | 联合瑞升（北京）科技有限公司 | Exhaust steam waste heat recovery and heat supply system of direct air cooling unit of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113882918A (en) * | 2021-09-09 | 2022-01-04 | 联合瑞升（北京）科技有限公司 | Exhaust steam waste heat recovery and heat supply system of direct air cooling unit of thermal power plant |
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