CN211854133U - Emergency heating system based on high-low pressure bypass combined heating - Google Patents
Emergency heating system based on high-low pressure bypass combined heating Download PDFInfo
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- CN211854133U CN211854133U CN202020450046.4U CN202020450046U CN211854133U CN 211854133 U CN211854133 U CN 211854133U CN 202020450046 U CN202020450046 U CN 202020450046U CN 211854133 U CN211854133 U CN 211854133U
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Abstract
The utility model discloses an emergency heating system based on high-low pressure bypass combined heating, which comprises a boiler, a steam turbine, a condenser, a heating network heater and a deaerator; the outlet of the superheater of the boiler is respectively connected with the steam inlet of the high-pressure cylinder and the steam inlet of the high-pressure bypass temperature and pressure reducing valve group; the outlet of the high-pressure bypass temperature and pressure reducing valve group is connected with the inlet of a reheater of the boiler; the outlet of the high-pressure cylinder is converged with the outlet of the high-pressure bypass temperature and pressure reducing valve group and then connected with the inlet of a reheater of the boiler. The utility model discloses main steam of boiler export reenters the reheater of boiler after the high pressure by-pass valve temperature reduction decompression in order to guarantee that boiler reheater wall temperature is in safety range, then enters into hot steam extraction pipeline again through the reheater side export of boiler again to when steam turbine or generator break down overhauls, effectively avoid local heating system to shut down and lead to the heating capacity of whole plant obviously to descend and cause serious heat supply accident, improve the heating system's of whole plant fail safe nature.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to the technical field of the combined heat and power generation, a emergent heating system based on heat supply is united to high-low pressure bypass is related to.
[ background of the invention ]
With the continuous and deep promotion of the work of preventing and controlling the air pollution, the clean and centralized heat supply of the coal is gradually the main heat source for the industrial steam and the heating of residents. According to design specifications of large and medium-sized thermal power plants (GB50660-2011), a cogeneration unit has two functions of power generation and heat supply in design, and has high heat supply reliability during external heat supply. For the heat supply type steam turbine, one boiler is preferably arranged in one machine, when one steam boiler with the largest capacity is stopped, if the external steam supply capacity of the other boilers cannot meet the requirements of 100 percent of production steam consumption and 60 to 75 percent (the upper limit is taken in severe cold regions) of winter heating, ventilation and domestic heat required by continuous production of thermal users, other standby heat sources are arranged by a heat supply network. For a heat supply power plant provided with a plurality of coal-fired power generating sets, a boiler heats water through raw coal combustion to generate high-temperature and high-pressure steam, the steam enters a steam turbine to generate electricity and supply heat, if equipment such as the steam turbine or a generator breaks down in a heat supply period and needs to be overhauled, the problems of heat supply quality reduction or heat supply stop and the like can be caused, and serious civil accidents are caused. The safety and reliability of the heating system are improved through technical transformation.
The high-pressure bypass and low-pressure bypass combined heat supply technology is an effective way for realizing emergency heat supply of a single-reheating coal-fired cogeneration unit: the new steam of boiler reduces the temperature and pressure through the high pressure bypass and is reduced to cold female pipe again, reentries the boiler reheater and heaies up the back, converges into the female pipe of heating steam after the low pressure bypass reduces the temperature and reduces the pressure, realizes shutting down different stove heating supplies heat, still possesses external heat supply ability when steam turbine or generator trouble, promotes the heat supply reliability by a wide margin.
[ Utility model ] content
An object of the utility model is to solve the problem that heating technology fail safe nature waited further promotion among the prior art, provide an emergent heating system based on heat supply is united to high low pressure bypass, this system can still possess certain heating capacity when steam turbine, generator a certain or two all the trouble overhaul.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
an emergency heating system based on high-low pressure bypass combined heating comprises:
the superheater outlet of the boiler is respectively connected with the steam inlet of the high-pressure cylinder and the steam side inlet of the high-pressure bypass temperature and pressure reducing valve group; the outlet of the high-pressure bypass temperature and pressure reducing valve group is connected with the inlet of a reheater of the boiler;
the outlet of the high-pressure cylinder is merged with the outlet of the high-pressure bypass temperature and pressure reducing valve group and then divided into three paths, one path is connected with the inlet of a reheater of the boiler, the other path is connected with the steam source inlet of the high-pressure heater, and the other path is connected with the steam source inlet of the deaerator; one part of the reheated steam enters an intermediate pressure cylinder, and the other part of the reheated steam enters a heat supply network heater; the high-pressure cylinder, the intermediate-pressure cylinder, the low-pressure cylinder and a rotating shaft of the generator are coaxially connected; the exhaust steam of the intermediate pressure cylinder is connected with the low pressure cylinder, and the exhaust steam of the low pressure cylinder enters the condenser;
the condensed water of the condenser enters the deaerator after being boosted;
the drain of the heat supply network heater enters the deaerator after being boosted;
the deaerator is used for conveying the condensed water to the high-voltage heater after boosting the condensed water; one part of the outlet of the high-pressure heater is conveyed to the water side inlet of the high-pressure bypass temperature and pressure reducing valve group, and the other part of the outlet of the high-pressure heater is conveyed to the boiler.
The utility model discloses further improvement lies in:
the inlets of the high-pressure cylinder and the intermediate pressure cylinder are respectively provided with a high-pressure cylinder steam inlet valve and an intermediate pressure cylinder steam inlet valve; the outlet of the reheater of the boiler is connected with the heating network heater through a heating main pipe valve group.
One path of the outlet of the heating heat supply main pipe valve group is connected with a boiler air heater.
A first valve and a second valve are respectively arranged at the deaerator and the steam source inlet and outlet of the high-pressure heater; a third valve is arranged on a pipeline between a water supply outlet of the high-pressure heater and the high-pressure bypass temperature and pressure reducing valve group; and a drain outlet of the high-pressure heater is connected to the deaerator through a fourth valve.
Still connect adjacent quick-witted auxiliary steam pipeline on the pipeline between the steam source entry of oxygen-eliminating device and the first valve, adjacent quick-witted auxiliary steam pipeline links to each other with adjacent quick-witted auxiliary steam header.
And the drainage of the heating network heater is boosted through a drainage pump, one part of the boosted drainage is conveyed to the deaerator, and the other part of the boosted drainage is conveyed to a heating and heat supply main pipe valve group through a fifth valve as desuperheating water to enter a heating and heat supply main pipe.
And an outlet of the condenser is connected with a condensate pump, and the condensate pump boosts the condensate and then conveys the condensate to the deaerator.
The outlet of the deaerator is connected with a water feeding pump, and the water feeding pump is used for conveying deaerated water to the high-pressure heater after boosting the deaerated water.
The condenser is also connected with a vacuum pump and is used for preventing air from leaking into the condenser when the steam turbine stops running or is in a rotary standby state.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses when steam turbine or generator are one or two all need overhaul under the fault condition, the main steam of boiler outlet reentrants the reheater of boiler in order to guarantee boiler reheater wall temperature and be in safety range after the high pressure bypass valve temperature reduction decompression, then reentrant hot steam extraction pipeline again through the reheater side export of boiler, get into local heating heat supply female pipe after the temperature reduction decompression, when overhauld at steam turbine or generator emergence trouble, effectively avoid local heating system outage to lead to whole factory heating heat supply ability to obviously descend and cause the serious heat supply accident, whole factory heating heat supply system's fail safe nature improves. In addition, the water entering the boiler is deoxidized and primarily heated through a deaerator, secondary heating is realized through a high-pressure heater, the safe operation of water feeding of the boiler is ensured, and the deaerator and the high-pressure heater are used for taking a steam source from cold re-steam or an adjacent machine auxiliary steam header.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of the heating system of the present invention.
Wherein: 1-a boiler; 2-high pressure cylinder; 3-a medium pressure cylinder; 4-low pressure cylinder; 5-a generator; 6-high pressure bypass temperature and pressure reducing valve group; 7-high-discharge check valve; 8-a high-pressure cylinder steam inlet valve; 9-a steam inlet valve of the intermediate pressure cylinder; 10-heating heat supply main pipe valve group; 11-a condenser; 12-a condensate pump; 13-a deaerator; 14-a feed pump; 15-a high pressure heater; 16-a first valve; 17-a second valve; 18-a third valve; 19-a fifth valve; 20-a fourth valve; 21-boiler air heater; 22-a heat net heater; 23-a drainage pump; 24-vacuum pump.
[ detailed description ] embodiments
In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution 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, and do not limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present. In addition, if a layer/element is "on" another layer/element in one orientation, then that layer/element may be "under" the other layer/element when the orientation is reversed.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to the figure, the emergency heating system based on high-low pressure bypass combined heating comprises a boiler 1, a high-pressure cylinder 2, an intermediate pressure cylinder 3, a low-pressure cylinder 4, a condenser 11, a heat supply network heater 22 and a deaerator 13;
the outlet of a superheater of the boiler 1 is respectively connected with a steam inlet of the high-pressure cylinder 2 and a steam side inlet of the high-pressure bypass temperature and pressure reducing valve group 6; the outlet of the high-pressure bypass temperature and pressure reducing valve group 6 is connected with the inlet of a reheater of the boiler 1; the outlet of the high-pressure cylinder 2 is merged with the outlet of the high-pressure bypass temperature and pressure reducing valve group 6 and then divided into three paths, one path is connected with the inlet of a reheater of the boiler 1, the other path is connected with the steam source inlet of the high-pressure heater 15, and the other path is connected with the steam source inlet of the deaerator 13; one part of the reheated steam enters the intermediate pressure cylinder 3, and the other part of the reheated steam enters the heat supply network heater 22; the high pressure cylinder 2, the intermediate pressure cylinder 3, the low pressure cylinder 4 and the generator 5 are coaxially connected through a rotating shaft; the exhaust steam of the intermediate pressure cylinder 3 is connected with the low pressure cylinder 4, and the exhaust steam of the low pressure cylinder 4 enters the condenser 11; the condensed water in the condenser 11 enters the deaerator 13 after being pressurized; the drained water of the heating network heater 22 is boosted and then enters the deaerator 13; the deaerator 13 deaerates the condensed water by the hydraulic force and then conveys the condensed water to the high-pressure heater 15 through the water feeding pump 14; one part of the outlet feed water of the high-pressure heater 15 is conveyed to the water side inlet of the high-pressure bypass temperature and pressure reducing valve group 6, and the other part of the outlet feed water is conveyed to the boiler 1.
The high-pressure cylinder steam inlet valve 8 and the medium-pressure cylinder steam inlet valve 9 are respectively arranged at the inlets of the high-pressure cylinder 2 and the medium-pressure cylinder 3; the outlet of the reheater of the boiler 1 is connected to the heating network heater 22 via the heating main pipe valve group 10. One path of the outlet of the heating and heat supply main pipe valve group 10 is connected with a boiler air heater 21.
The deaerator 13 and the high-pressure heater 15 are respectively provided with a first valve 16 and a second valve 17 at the steam source inlet and outlet; a third valve 18 is arranged on a pipeline between the feed water outlet of the high-pressure heater 15 and the high-pressure bypass temperature and pressure reducing valve group 6; the drain outlet of the high pressure heater 15 is connected to the deaerator 13 through a fourth valve 20. And a pipeline between the steam source inlet of the deaerator 13 and the first valve 16 is also connected with an adjacent machine auxiliary steam pipeline, and the adjacent machine auxiliary steam pipeline is connected with an adjacent machine auxiliary steam header.
The drainage of the heating network heater 22 is boosted through the drainage pump 23, one part of the boosted drainage is conveyed to the deaerator 13, and the other part of the boosted drainage is conveyed to the heating main pipe valve group 10 as desuperheating water through the fifth valve 19 to enter the heating main pipe. The outlet of the condenser 11 is connected with a condensate pump 12, and the condensate pump 12 boosts the pressure of the condensate and then conveys the condensate to a deaerator 13. The outlet of the deaerator 13 is connected with a water feed pump 14, and after the deaerated water is pressurized by the water feed pump 14, the deaerated water is conveyed to a high-pressure heater 15. The condenser 11 is also connected to a vacuum pump 24 for preventing air leakage when the turbine is stopped or in a rotating standby state.
The utility model discloses a working process:
for the fail safe nature of guarantee unit normal operating, emergent heating system based on heat supply is united to high low pressure bypass should newly-built high pressure bypass system of the same kind, the configuration is the same with current high pressure bypass, set up the tee bend before female pipe of hot reheat steam, current low pressure bypass valve, draw the female pipe of original heating steam of unit that converges after the steam temperature reduction decompression of heat reheat, hot reheat steam extraction pipeline specification is according to the through-flow capacity accounting and is confirmed.
When steam turbine or generator are one or two all the trouble to be shut down and need to be shut down and overhaul, lead to the heating capacity of whole factory obviously to descend and cause serious heat supply accident for avoiding local heating system to shut down, the utility model discloses an emergent heating system drops into the operation. The high pressure cylinder steam inlet valve 8, the intermediate pressure cylinder steam inlet valve 9 and the high exhaust check valve 7 are closed, the generator 5 is stopped, the steam turbine composed of the high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinder 4 stops running or is in a rotary standby state, and the vacuumizing system 24 normally runs to prevent air from leaking in.
The boiler 1 keeps the operation of the evaporation capacity above the stable combustion load, new steam at the outlet of the superheater enters a cold re-steam main pipe through the high-pressure bypass temperature and pressure reducing valve set 6, the temperature reducing water is provided by a water supply system at the outlet of the high-pressure heater 15, and at the moment, the high-pressure bypass temperature and pressure reducing valve set 6 and the third valve 18 are opened.
The cold reheat steam, except for one part of cold reheat steam supplied to a deaerator 13 and a high-pressure heater 15, enters a boiler reheater 1 to absorb heat again so as to protect the wall temperature of the boiler reheater within a safe range, the steam at the outlet of the reheater enters a unit heating main pipe after being subjected to temperature and pressure reduction through a heating main pipe valve group 10, the temperature reduction water is taken from the outlet of a drain pump 23, and a fourth valve 19 is opened; the heat vapor pressure and the temperature are regulated by the boiler 1, the feed pump 14, the high-pressure bypass temperature and pressure reducing valve group 6 and other equipment in a comprehensive mode. In order to ensure the steam-water balance of the coal-fired power generating set, the outlet drain of the heat supply network heater 22 is boosted by a drain pump 23 and then enters the inlet of a deaerator 13, at the moment, the condenser 11 and a condensate pump 12 are stopped, in order to avoid potential safety hazards caused by the cold water entering the boiler and the oxygen in the water, the deaerator 13 and a high-pressure heater 15 are put into the deaerator to realize thermal deaerating and step heating, a heating steam source is taken from cold and then steam, a first valve 16 and a second valve 17 are opened, and the drain of the high-pressure heater 15 enters the deaerator through; the heating steam source can also be taken from an auxiliary steam header of an adjacent machine. In order to avoid low-temperature corrosion of a heating surface at the cold end of the air preheater, the boiler air heater 21 needs to be normally put into operation, a steam source is taken from a heating steam main pipe after self-heating, steam extraction, temperature reduction and pressure reduction, and drain water is returned to an inlet of the deaerator.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides an emergent heating system based on heat supply is united to high low pressure bypass which characterized in that includes:
the boiler (1), the superheater outlet of the boiler (1) is respectively connected with the steam inlet of the high-pressure cylinder (2) and the steam side inlet of the high-pressure bypass temperature and pressure reducing valve group (6); the outlet of the high-pressure bypass temperature and pressure reducing valve group (6) is connected with the inlet of a reheater of the boiler (1);
the outlet of the high-pressure cylinder (2) is merged with the outlet of the high-pressure bypass temperature and pressure reducing valve group (6) and then divided into three paths, one path is connected with the inlet of a reheater of the boiler (1), the other path is connected with the steam source inlet of the high-pressure heater (15), and the other path is connected with the steam source inlet of the deaerator (13); one part of the reheated steam enters an intermediate pressure cylinder (3), and the other part of the reheated steam enters a heat supply network heater (22); the rotating shafts of the high pressure cylinder (2), the middle pressure cylinder (3), the low pressure cylinder (4) and the generator (5) are coaxially connected; the exhaust steam of the intermediate pressure cylinder (3) is connected with the low pressure cylinder (4), and the exhaust steam of the low pressure cylinder (4) enters a condenser (11);
the condenser (11), the condensed water of the condenser (11) enters the deaerator (13) after being pressurized;
the water drainage of the heat supply network heater (22) is pressurized and then enters the deaerator (13);
the deaerator (13), the deaerator (13) conveys the condensed water to the high-pressure heater (15) after boosting; one part of the outlet of the high-pressure heater (15) is conveyed to the water side inlet of the high-pressure bypass temperature and pressure reducing valve group (6), and the other part of the outlet of the high-pressure heater is conveyed to the boiler (1).
2. The emergency heating and heat supply system based on high-low pressure bypass combined heat supply according to claim 1, wherein the inlets of the high-pressure cylinder (2) and the medium-pressure cylinder (3) are respectively provided with a high-pressure cylinder steam inlet valve (8) and a medium-pressure cylinder steam inlet valve (9); the outlet of the reheater of the boiler (1) is connected with the heating network heater (22) through a heating main pipe valve group (10).
3. The emergency heating system based on the combined high-low pressure bypass heating as claimed in claim 2, wherein one path of the outlet of the heating main pipe valve group (10) is connected with a boiler fan heater (21).
4. The emergency heating and heating system based on the high-low pressure bypass combined heating according to claim 1 or 2, wherein the steam source inlets and outlets of the deaerator (13) and the high-pressure heater (15) are respectively provided with a first valve (16) and a second valve (17); a third valve (18) is arranged on a pipeline between a water supply outlet of the high-pressure heater (15) and the high-pressure bypass temperature and pressure reducing valve group (6); the drainage outlet of the high-pressure heater (15) is connected to the deaerator (13) through a fourth valve (20).
5. The emergency heating and heat supply system based on the high-low pressure bypass combined heat supply is characterized in that an adjacent machine auxiliary steam pipeline is further connected to a pipeline between a steam source inlet of the deaerator (13) and the first valve (16), and the adjacent machine auxiliary steam pipeline is connected with an adjacent machine auxiliary steam header.
6. The emergency heating system based on high-low pressure bypass combined heating according to claim 2, wherein the drainage of the heating network heater (22) is boosted through a drainage pump (23), one part of the boosted drainage is conveyed to the deaerator (13), and the other part of the boosted drainage is conveyed to a heating and heating main pipe valve group (10) through a fifth valve (19) to enter the heating and heating main pipe as desuperheating water.
7. The emergency heating and heat supply system based on high-low pressure bypass combined heat supply according to claim 1, wherein a condensate pump (12) is connected to an outlet of the condenser (11), and after the condensate pump (12) boosts the pressure of the condensate, the condensate is conveyed to the deaerator (13).
8. The emergency heating system based on high-low pressure bypass combined heating is characterized in that the outlet of the deaerator (13) is connected with a water feeding pump (14), and the deaerated water is pressurized by the water feeding pump (14) and then conveyed to the high-pressure heater (15).
9. The emergency heating and heat supply system based on high-low pressure bypass combined heat supply according to claim 1, wherein a vacuum pump (24) is further connected to the condenser (11) for preventing air leakage when the turbine is stopped or in a rotating standby state.
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| CN202020450046.4U CN211854133U (en) | 2020-03-31 | 2020-03-31 | Emergency heating system based on high-low pressure bypass combined heating |
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| CN202020450046.4U CN211854133U (en) | 2020-03-31 | 2020-03-31 | Emergency heating system based on high-low pressure bypass combined heating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111288531A (en) * | 2020-03-31 | 2020-06-16 | 西安西热节能技术有限公司 | Emergency heating system and method based on high-low pressure bypass combined heating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111288531A (en) * | 2020-03-31 | 2020-06-16 | 西安西热节能技术有限公司 | Emergency heating system and method based on high-low pressure bypass combined heating |
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