CN212057241U - Thermal power generating unit deoxidization-free thermodynamic system - Google Patents
Thermal power generating unit deoxidization-free thermodynamic system Download PDFInfo
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- CN212057241U CN212057241U CN202020531036.3U CN202020531036U CN212057241U CN 212057241 U CN212057241 U CN 212057241U CN 202020531036 U CN202020531036 U CN 202020531036U CN 212057241 U CN212057241 U CN 212057241U
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Abstract
The utility model relates to a thermal power generating unit deoxidization-free thermodynamic system, which comprises a condenser, a first water pump, a shaft seal heater, a mixed heater assembly, a low-pressure surface type heater assembly and a high-pressure surface type heater assembly which are sequentially connected in series along the boiler water supply direction; the hybrid heater assembly comprises a plurality of gravity-connected low pressure hybrid heaters; the low pressure hybrid heater is provided with the overflow pipe, overflow pipe one end and low pressure hybrid heater inner space intercommunication, the other end and water seal structural connection, the water seal structure includes outer tube and the inner tube of coaxial setting, inner tube and overflow pipe intercommunication, the outer tube passes through connecting pipe and condenser intercommunication, the inner tube is linked together with the blast pipe, the utility model discloses a system deoxidization is effectual, operation safety and stability.
Description
Technical Field
The utility model relates to a thermal power unit equipment technical field, concretely relates to thermal power unit does not have deoxidization thermodynamic system.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
A traditional supercritical condensing thermal power generating unit heat recovery system is provided with eight-stage steam extraction, and three high-pressure heaters, 1 deaerator and four low-pressure heaters are respectively heated. The deaerators are arranged in the traditional thermodynamic system, have the functions of water supply deaerating, flow buffering, collecting drainage, steam leakage and the like, are very important in the condensing unit thermodynamic system, and have negative effects on the safety and economic operation of the unit. The deaerating water tank has the advantages of thermal inertia, complex system, more accident points, large maintenance amount, reliability problem, steam extraction throttling loss, poor running economy and large construction investment, and a thermal system without a deaerator is present at present, so that the system can be simplified, the accident rate is reduced, and the running safety and reliability are improved; a regenerative system is optimized, the heat loss of exhaust steam is reduced, and the operation economy is improved; part of equipment is cancelled, and auxiliary power is saved; the method is characterized in that an oxygen layer is eliminated, capital construction investment and operation and maintenance cost are saved, a hybrid heater is indispensable equipment in a system without a deaerator, but the inventor finds that the existing deaerator-free system is only provided with one hybrid heater, the deaerator effect is poor, the heat economy is low, and when the hybrid heater is applied to a thermal system without deaerator, if the hybrid low-pressure heater is under the condition of unbalanced water inlet and outlet amount, a full water phenomenon can occur, and once the water level rises to a turbine blade, the blade can be damaged inevitably.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming above-mentioned prior art not enough, provide a thermal power unit does not have deoxidization thermodynamic system, the deoxidization is effectual, and heat economy nature is good, and the fail safe nature of system is higher.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
in a first aspect, an embodiment of the utility model provides a thermal power generating unit deoxidization-free thermodynamic system, which comprises a condenser, a first water pump, a shaft seal heater, a hybrid heater assembly and a surface heater assembly, which are sequentially connected in series along the boiler water supply direction;
the hybrid heater assembly comprises a plurality of gravity-connected low pressure hybrid heaters;
the low pressure hybrid heater is provided with the overflow pipe, overflow pipe one end and low pressure hybrid heater inner space intercommunication, the other end and water seal structural connection, the water seal structure includes outer tube and the inner tube of coaxial setting, inner tube and overflow pipe intercommunication, the outer tube passes through connecting pipe and condenser intercommunication, the inner tube is linked together with the blast pipe.
Above-mentioned the utility model discloses an embodiment's beneficial effect as follows:
1. the utility model discloses a thermal power generating unit does not have deoxidization thermodynamic system has a plurality of low pressure hybrid heaters, and the deoxidization is effectual, and adopts the extraction pipe that a plurality of low pressure hybrid heaters can insert a plurality of steam turbines, and heat economy nature is good, and a plurality of low pressure hybrid heaters adopt gravity to connect, have reduced the setting of relay pump, have reduced entire system's cost.
2. The utility model discloses a thermal power generating unit does not have deoxidization thermodynamic system, low pressure hybrid heater are provided with the overflow pipe, and when the water level was too high in the heater, water in the heater can flow out and get into the condenser through water seal mechanism through the overflow pipe, effectively prevents full water in the heater, has avoided the harm to the turbine wheel.
3. The utility model discloses a thermal power generating unit does not have deoxidization thermodynamic system installs the water seal structure on the overflow pipe, when satisfying the overflow pipe drainage, can prevent that steam from passing through the overflow pipe and flowing into the condenser in the heater, has guaranteed the normal work of condenser.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;
fig. 2 is a schematic view of a water sealing mechanism in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a first low-pressure hybrid heater according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of a mixer in embodiment 1 of the present invention;
wherein, 1, a condenser, 2, a first water pump, 3, a shaft seal heater, 4, a second water pump, 5, a first low-pressure mixed heater, 5-1, a shell, 5-2, a first steam inlet pipe, 5-3, a water tank, 5-4, a water pool, 5-5, a water inlet pipe, 5-6, a drain pipe, 5-7, a second steam inlet pipe, 5-8, a steam outlet pipe, 5-9, a water outlet pipe, 6, a second low-pressure mixed heater, 7, a communicating pipe, 8, an overflow pipe, 9, an inner pipe, 10, an outer pipe, 11, a connecting pipe, 12, an exhaust pipe, 13, a porous plate, 14, an adjusting valve, 15, a low-pressure surface heater, 16, a high-pressure surface heater, 17, a mixer, 17-1, a first pipeline, 17-2, a conical pipe section, 17-3, a through hole, 17-4, a second pipeline, 17-5, a cavity, 17-6, a third pipeline, 18, a water supply pump and 19, a membrane safety valve.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "upper" and "lower" in the present invention shall only be used to indicate correspondence with the upper and lower directions of the drawings themselves, and shall not limit the structure, but merely to facilitate the description of the present invention and simplify the description, and shall not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and shall not be construed as limiting the present invention.
As described in the background art, the conventional oxygen-free thermodynamic system is only provided with one low-pressure hybrid heater, so that the oxygen-free effect is poor, the heat economy is low, and meanwhile, when water inlet and water outlet in the heater are unbalanced, the damage of a steam turbine is easily caused.
In a typical implementation manner of the application, as shown in fig. 1-4, a thermal power generating unit oxygen-free thermodynamic system includes a condenser 1, a first water pump 2, a shaft seal heater 3, a hybrid heater assembly, a second water pump 4 and a surface heater assembly which are sequentially connected in series along a boiler water supply direction, wherein the condenser is used for being connected with an exhaust steam outlet of a steam turbine, the surface heater assembly is used for being connected with an economizer of a boiler, and all elements are connected in series through pipelines.
The hybrid heater assembly comprises a first low-pressure hybrid heater 5 and a second low-pressure hybrid heater 6 which are arranged in series, the first low-pressure hybrid heater and the second low-pressure hybrid heater are connected in a conventional gravity connection mode, namely the height of the first low-pressure hybrid heater is higher than that of the second low-pressure hybrid heater, a water outlet pipe of the first low-pressure hybrid heater is communicated with one end of a communicating pipe 7, the other end of the communicating pipe is communicated with a water inlet pipe of the second low-pressure hybrid heater, the communicating pipe is a U-shaped pipe and comprises a horizontal section and two vertical sections, the end of one vertical section is communicated with the water outlet pipe of the first low-pressure hybrid heater, and the end of the other vertical section is communicated with the water inlet pipe of the second low-pressure hybrid heater.
The first low-pressure mixed heater and the second low-pressure mixed heater are connected in a gravity mode, so that the number of the relay pumps can be reduced, and the equipment investment of the whole system is reduced.
The first low-pressure mixed heater and the second low-pressure mixed heater are both provided with overflow pipes 8, the overflow pipes are connected with a water sealing mechanism, the water sealing mechanism is connected with the condenser 1, when the water level in the first low-pressure mixed heater and the second low-pressure mixed heater exceeds a set position, the water can enter the overflow pipes to be discharged, the first low-pressure mixed heater and the second low-pressure mixed heater are prevented from being filled with water, and then the water is prevented from rising to a turbine blade to cause the damage of the turbine blade.
The water seal mechanism includes inner tube 9 and the outer tube 10 of coaxial setting, and inner tube and outer tube height are less than first low pressure hybrid heater and second low pressure hybrid heater height to fix inside the basis, the inner tube sets up at the outer tube insidely, and the top parallel and level of inner tube and outer tube just seals the setting, and the bottom of outer tube seals the setting, the uncovered setting in bottom of inner tube, overflow pipe tip and inner tube intercommunication, the condenser is connected with the one end intercommunication of connecting pipe 11, the other end of connecting pipe to the outer tube.
When the inside water level of first low pressure hybrid heater or second low pressure hybrid heater surpassed the overflow pipe, its inside water can flow through the overflow pipe, gets into the inner tube through the overflow pipe, then gets into the outer tube through the inner tube, gets into the condenser through the outer tube, has effectively avoided full water in the heater, and inner tube and outer tube injection water back simultaneously can form the water seal, have effectively avoided the inside steam of heater to pass through the overflow pipe and have got into the condenser, play safety protection's effect.
The inner tube still communicates with blast pipe 12, inside the blast pipe bottom stretched into the inner tube, its top was provided with perforated plate 13, be provided with governing valve 14 on the blast pipe, through setting up the blast pipe, can make the water in the overflow pipe get into the inner tube smoothly, avoid the interior cavity atmospheric pressure to hinder the inflow of overflow pipe internal water.
The first low-pressure hybrid heater and the second low-pressure hybrid heater both comprise a shell 5-1, the diameter of the shell is about 2.2 meters, the height of the shell is about 5 meters, a first steam inlet pipe 5-2 communicated with the inner space of the shell is arranged on the shell wall of the top of the shell, the first steam inlet pipe can be connected with a steam extraction pipe of a steam turbine, and the extracted steam of the steam turbine can enter the shell through the first steam inlet pipe.
The water tank is characterized in that a plurality of water tanks 5-3 and a plurality of water tanks 5-4 are arranged on the upper edge and the lower edge in the shell, the water tanks are uniformly distributed along the circumference, each water tank is provided with a water inlet pipe 5-5 in a matching manner, one end of each water inlet pipe is communicated with the water tank, the other end of each water inlet pipe of the first low-pressure mixed heater is connected with the shaft seal heater, the first water pump can drive condensed water discharged by the condenser to enter the water tanks through the water inlet pipes, and the other end of each water inlet pipe of the second low-pressure mixed heater.
Be provided with a plurality of first jet orifices on the lateral wall of water tank, hydroenergy in the water tank can be through first jet orifice blowout, and spun hydroenergy can get into the pond, and water tank spun water can advance the pipe sparged high-temperature gas with first steam and carry out the heat exchange, accomplishes the deoxidization.
The bottom surface in pond is provided with a plurality of second jet orifices, and water in the pond can flow out through the second jet orifice, the bottom of casing is provided with outlet pipe 5-9, and water in the casing can flow out through the outlet pipe.
The pool is communicated with 5-6 of the drain pipe, the drain pipe is used for connecting high-temperature drain, and the high-temperature drain is used for mixing with water in the pool to heat and remove oxygen from the water.
And a second steam inlet pipe 5-7 is arranged below the water tank, a plurality of nozzles are arranged on the second steam inlet pipe, the second steam inlet pipe can be communicated with a steam pipe of a steam turbine shaft seal, steam of the steam turbine shaft seal can enter the second steam inlet pipe and is sprayed out from the nozzles to exchange heat with water flowing down from the water tank, and oxygen is further removed from the water.
The steam entering through the steam extraction pipe of the steam turbine, the steam of the shaft seal of the steam turbine and the high-temperature drain water heat the water entering through the water inlet pipe to the saturation temperature, and the water is deoxidized.
And a partition plate 5-10 is arranged below the second steam inlet pipe, the partition plate is fixedly connected with the inner side surface of the shell, a water falling hole is formed in the shell, and a check valve 5-11 is installed at the water falling hole. The check valve only allows water to flow from top to bottom.
And a steam discharge pipe 5-8 is arranged at the top of the side wall of the shell and used for discharging redundant steam in the shell.
The shell is connected with an overflow pipe, the overflow pipe is of an L-shaped structure and comprises a vertical portion and a horizontal portion which are connected vertically, the top end of the vertical portion is arranged below the water pool and above the partition plate, the bottom end of the vertical portion is connected with the horizontal portion, and the horizontal portion extends out of the shell and is communicated with an inner pipe of the water sealing mechanism.
The surface heater assembly comprises a low-pressure surface heater assembly and a high-pressure surface heater assembly which are arranged in series.
The low pressure surface heater assembly is connected with a second water pump, and a plurality of low pressure surface heaters 15 are arranged in series.
In this embodiment, the low-pressure surface heater is further connected to the drain pipes of the first low-pressure hybrid heater and the second low-pressure hybrid heater, and the generated drain can be guided into the drain pipes of the first low-pressure hybrid heater and the second low-pressure hybrid heater through the drain pipes, thereby improving thermal economy.
The high pressure surface heater assembly includes a plurality of high pressure surface heaters 16 arranged in series, in this embodiment, two high pressure surface heaters are provided, and the high pressure surface heaters are connected to the extraction pipe of the steam turbine to exchange heat by using the extraction steam of the steam turbine.
A mixer 17 and a feed pump 18 are sequentially connected in series between the high-pressure surface heater assembly and the low-pressure surface heater assembly, the mixer is respectively connected in series with the feed pump and the low-pressure surface heater assembly, and the feed pump is respectively connected in series with the mixer and the high-pressure surface heater assembly.
Set up the blender before the feed pump, during system normal operating, the high pressure drainage that two high-pressure surface formula heaters produced can introduce the blender, can improve thermodynamic system's economic nature, simultaneously, under the condition of second water pump trouble, can discharge the drainage of high-pressure surface formula heater into the blender, guarantees that the feed pump is lazy to go away to the reliability of system has been improved. The mixer can also be used for adjusting the water temperature at the inlet of the feed pump when the feed pump is started and stopped, and controlling the heating or cooling speed of the feed pump, thereby improving the reliability of the thermodynamic system.
The mixer comprises a first pipeline 17-1, wherein two ends of the first pipeline are provided with tapered pipe sections 17-2, the pipe wall of the first pipeline is provided with a plurality of through holes 17-3, the periphery of the first pipeline is sleeved with a second pipeline 17-4, two ends of the second pipeline are respectively connected with a water feeding pump and a low-pressure surface type heater assembly, the second pipeline is welded and fixed with the edge of the larger cross-section end part of the tapered pipe section, a closed cavity 17-5 is formed between the peripheral surface of the first pipeline and the inner side surface of the second pipeline, the second pipeline is connected with a third pipeline 17-6, the third pipeline is communicated with the cavity formed by the first pipeline and the second pipeline, the third pipeline is connected with a high-pressure surface type heater, and hydrophobic water generated by the high-pressure surface type heater can enter the first pipeline through the third pipeline and the through holes, mixing with the condensed water.
A membrane safety valve 19 is provided between the mixer and the low pressure surface heater for overpressure protection of the entire system.
In this embodiment, the condensed water discharged from the condenser sequentially flows through the hybrid heater assembly, the low-pressure surface heater assembly, and the high-pressure surface heater assembly, and then enters the economizer, and the heat exchange is performed in the hybrid heater assembly, the low-pressure surface heater assembly, and the high-pressure surface heater assembly by using the extraction steam generated by the steam turbine, so that the condensed water is heated to a saturated state to remove oxygen.
When the second water pump breaks down, the condensed water level of the first low-pressure mixed heater and the condensed water level of the second low-pressure mixed heater rise to exceed the overflow pipe, and the condensed water flows out of the overflow pipe, so that the blades of the steam turbine are prevented from being damaged by the full water of the two mixed heaters.
Hydrophobic the that low pressure surface formula heater produced can get into two low pressure hybrid heaters, utilizes hydrophobic and condensate water to carry out the heat exchange, and hydrophobic the that two high pressure surface formula heaters produced simultaneously can get into the blender through the third pipeline, carries out the heat exchange with the condensate water, has improved thermal utilization ratio.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. A thermal power generating unit oxygen-free thermodynamic system is characterized by comprising a condenser, a first water pump, a shaft seal heater, a mixed heater assembly and a surface heater assembly which are sequentially arranged in series along the water supply direction of a boiler;
the hybrid heater assembly comprises a plurality of gravity-connected low pressure hybrid heaters;
the low pressure hybrid heater is provided with the overflow pipe, overflow pipe one end and low pressure hybrid heater inner space intercommunication, the other end and water seal structural connection, the water seal structure includes outer tube and the inner tube of coaxial setting, inner tube and overflow pipe intercommunication, the outer tube passes through connecting pipe and condenser intercommunication, the inner tube is linked together with the blast pipe.
2. The thermal power generating unit oxygen-free thermodynamic system of claim 1, wherein the low-pressure hybrid heater comprises a housing, a first steam inlet pipe is disposed on the top of the housing, the first steam inlet pipe can be communicated with a steam extraction pipe of a steam turbine, a water tank and a water pool are disposed in the housing, the water tank is distributed up and down, the water tank is communicated with a water inlet pipe, a first jet hole is disposed on a side wall of the water tank, a second jet hole is disposed at the bottom of the water pool, the water pool is communicated with a drain pipe, the drain pipe is connected with the low-pressure surface heater assembly, drain generated by the low-pressure surface heater assembly can enter the water pool through the drain pipe, a second steam inlet pipe is disposed below the water pool, the second steam inlet pipe can be communicated with a steam pipe of the steam turbine, a partition plate fixedly connected with the housing is disposed below the second steam inlet pipe, the baffle plate is provided with a check valve, and the bottom end of the shell is provided with a water outlet pipe.
3. The thermal power generating unit oxygen-free thermodynamic system as claimed in claim 2, wherein the overflow pipe is of an L-shaped structure and comprises a vertical part and a horizontal part, the top end of the vertical part is located below the water pool and above the partition plate, the bottom end of the vertical part is connected with one end of the horizontal part, and the other end of the horizontal part extends out of the shell and is communicated with the inner pipe.
4. The thermal power generating unit oxygen-free thermodynamic system as claimed in claim 2, wherein the top of the side wall of the casing is further provided with a steam discharge pipe for discharging steam in the casing.
5. The thermal power generating unit oxygen-free thermodynamic system as claimed in claim 1, wherein the top end of the exhaust pipe is provided with a porous plate, the bottom end of the exhaust pipe extends into the inner pipe, and the exhaust pipe is provided with a regulating valve.
6. The thermal power generating unit oxygen-free thermodynamic system as claimed in claim 1, wherein a second water pump is disposed between the hybrid heater assembly and the surface heater assembly.
7. The thermal power unit oxygen-free thermodynamic system of claim 1, wherein the surface heater assembly comprises a series of low-pressure surface heater assemblies and a high-pressure surface heater assembly, the low-pressure surface heater assembly comprising a plurality of low-pressure surface heaters arranged in series, the high-pressure surface heater assembly comprising a plurality of high-pressure surface heaters arranged in series.
8. The thermal power generating unit oxygen-free thermodynamic system according to claim 7, wherein a mixer and a feed pump are disposed between the low-pressure surface heater assembly and the high-pressure surface heater assembly, the mixer is connected in series with the low-pressure surface heater assembly and the feed pump, and the feed pump is connected in series with the mixer and the high-pressure surface heater assembly.
9. The thermal power generating unit oxygen-free thermodynamic system according to claim 8, wherein the mixer comprises a first pipeline, a plurality of through holes are formed in a pipe wall of the first pipeline, tapered pipe sections are arranged at two ends of the first pipeline, a second pipeline is sleeved on the periphery of the first pipeline, the second pipeline is fixedly connected with the first pipeline through the tapered pipe sections, a closed cavity is formed between the first pipeline and the second pipeline, two ends of the second pipeline are connected with the low-pressure surface heater assembly and the feed pump, the second pipeline is communicated with a third pipeline, the third pipeline is connected with the high-pressure surface heater assembly, and hydrophobic water generated by the high-pressure surface heater assembly can be injected into the first pipeline and the second pipeline.
10. The thermal power unit oxygen-free thermodynamic system of claim 8, wherein a membrane relief valve is provided between the mixer and the low pressure surface heater assembly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020531036.3U CN212057241U (en) | 2020-04-10 | 2020-04-10 | Thermal power generating unit deoxidization-free thermodynamic system |
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| CN202020531036.3U CN212057241U (en) | 2020-04-10 | 2020-04-10 | Thermal power generating unit deoxidization-free thermodynamic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115164186A (en) * | 2022-07-11 | 2022-10-11 | 中冶南方都市环保工程技术股份有限公司 | External steam cooling system for reducing heat exchange end difference of supercritical gas generator set |
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2020
- 2020-04-10 CN CN202020531036.3U patent/CN212057241U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115164186A (en) * | 2022-07-11 | 2022-10-11 | 中冶南方都市环保工程技术股份有限公司 | External steam cooling system for reducing heat exchange end difference of supercritical gas generator set |
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