CN214840952U - Energy-saving steam air preheater system - Google Patents
Energy-saving steam air preheater system Download PDFInfo
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- CN214840952U CN214840952U CN202120980513.9U CN202120980513U CN214840952U CN 214840952 U CN214840952 U CN 214840952U CN 202120980513 U CN202120980513 U CN 202120980513U CN 214840952 U CN214840952 U CN 214840952U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
An energy-saving steam air preheater system relates to a heat exchange device and aims to solve the problems that steam waste heat cannot be fully recycled and high-quality steam consumption is large. The utility model comprises a steam air preheater, a primary flash tank and a secondary flash tank; the high-pressure condensed water outlet on the steam air preheater is communicated with the inlet of the first-level flash tank through a pipeline, the flash steam outlet on the first-level flash tank is communicated with the medium-pressure steam inlet on the steam air preheater through a pipeline, the low-pressure water outlet on the first-level flash tank is communicated with the inlet on the second-level flash tank through a pipeline, the flash steam outlet on the second-level flash tank is communicated with the low-pressure steam inlet on the steam air preheater through a pipeline, and the supercooled water after the flash evaporation of the second-level flash tank is input into the supercooling section of the steam air preheater or is directly drained to the deaerator through a pipeline. The utility model discloses a set up multistage flash tank and fully exchange the heat with steam cycle, make the waste heat fully retrieve, improved heat exchange efficiency.
Description
Technical Field
The utility model relates to a steam treatment system, concretely relates to energy-conserving steam air preheater system.
Background
In operation of a waste incineration power plant, a steam air preheater provides hot air to a boiler combustion chamber. The steam air preheater may be arranged in a vertical or horizontal manner, i.e. the air flow direction may be vertical or horizontal. The steam for heating the air comes from a boiler drum or a steam extraction of a steam turbine. The heat source steam flows in the heat exchange tube group of the preheater, the air to be heated flows outside the heat exchange tube group of the preheater, and the heat transfer is realized through the heat exchange tube group in the preheater. The heated air is sent into a fire grate or a hearth of the garbage incinerator, so that the effects of drying fuel and supporting combustion are realized on the one hand, and the boiler efficiency is improved by recovering heat through the air on the other hand.
The choice of steam source generally requires consideration of three aspects: steam quality, steam consumption, and drainage pattern. Generally, the higher the temperature at which the air needs to be heated, the higher the quality of the steam (pressure, temperature) that is needed. Generally speaking, the higher the high-quality steam consumption, the lower the efficiency of the whole unit and the poorer the energy-saving effect. At present, the drainage mode is generally divided into two modes, one mode is that steam condensate is discharged to a drainage flash tank or a deaerator after being depressurized; the other is that after the pressure is released and the flash is performed through a flash tank, the steam condensate is discharged to a deaerator. Compared with low-pressure steam, the high-pressure steam is usually directly discharged after being condensed into water through heat exchange; or the waste heat is discharged after the pressure is released by the primary flash tank, and the flash steam formed in the flash tank is guided into the low-pressure side of the steam air preheater of the garbage incinerator to continuously participate in heat exchange, so that the waste heat cannot be fully recovered.
At present, with the continuous development of waste incineration generating sets in recent years, the pressure of a boiler drum is continuously improved, and more steam extraction interfaces of a steam turbine are provided. The steam source of the steam air preheater of the traditional garbage incinerator is taken from a steam drum for steam extraction and a steam turbine for steam extraction to heat air, the economy of the method is increasingly poor, and a new system design mode is required to be adopted according to the condition of a novel high-parameter generator set so as to meet the requirements of energy conservation and efficiency improvement.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve steam waste heat can not abundant recycle, the great problem of high-quality steam consumption, and provide an energy-conserving steam air preheater system.
The utility model discloses a solve the technical scheme that above-mentioned technical problem took and be:
an energy-saving steam air preheater system comprises a steam air preheater, a primary flash tank and a secondary flash tank;
the high-pressure condensed water outlet on the steam air preheater is communicated with the inlet of the first-level flash tank through a pipeline, the flash steam outlet on the first-level flash tank is communicated with the medium-pressure steam inlet on the steam air preheater through a pipeline, the low-pressure water outlet on the first-level flash tank is communicated with the inlet on the second-level flash tank through a pipeline, the flash steam outlet on the second-level flash tank is communicated with the low-pressure steam inlet on the steam air preheater through a pipeline, and the supercooled water after the flash evaporation of the second-level flash tank is input into the supercooling section of the steam air preheater or is directly drained to the deaerator through a pipeline.
Has the advantages that: high-pressure steam is changed into high-pressure condensed water after heat exchange of the equipment steam air preheater, the condensed water enters the primary flash tank to be decompressed and flashed, the flash steam is converged into a medium-pressure (lower than the pressure of the high-pressure steam) steam pipeline from the upper pipeline of the primary flash tank and finally led to a medium-pressure steam inlet of the steam air preheater, the low-pressure water after flashing enters the secondary flash tank to be decompressed and flashed again, the flash steam is converged into a low-pressure (lower than the pressure of the two types of steam) steam pipeline from the upper pipeline of the secondary flash tank and finally led to a low-pressure steam inlet of the steam air preheater, and the low-pressure water after flashing returns to a supercooling section on the steam preheater to continuously release heat or directly drain water to a deaerator.
On the basis of the technical scheme, the technical scheme can be improved as follows.
Further, the number of the secondary flash tanks and the primary flash tanks is at least 1.
Has the advantages that: if the steam extraction interface of the steam turbine is richer than the interfaces, more flash tanks can be continuously arranged to realize the flash waste heat recovery process for more times.
Furthermore, a medium-pressure condensed water outlet is arranged on the steam air preheater and is communicated with an inlet on the secondary flash tank through a pipeline.
Has the advantages that: and medium-pressure condensed water which is not subjected to sufficient heat exchange after the heat exchange of the steam air preheater is further recovered, so that the waste heat recovery is realized.
Furthermore, a first supercooled water outlet for leading to the deoxygenator is arranged on the steam air preheater.
Has the advantages that: the medium after heat exchange is convenient to discharge.
And further, a second supercooled water outlet for leading to a condenser is also arranged on the steam air preheater.
Has the advantages that: the medium after heat exchange is convenient to discharge.
Furthermore, a low-pressure water outlet is arranged on the steam air preheater and is communicated with a supercooling section on the steam air preheater through a pipeline.
Has the advantages that: and low-pressure water which is not fully subjected to heat exchange after the heat exchange of the steam air preheater is further recovered, so that the waste heat recovery is realized.
Furthermore, a steam inlet connected with a four-extraction pipeline of the steam turbine is arranged on the steam air preheater.
Has the advantages that: and the steam of the four-extraction pipeline of the steam turbine is subjected to heat exchange, so that the waste heat recovery is realized.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of the present invention.
Reference numerals:
10-steam air preheater; 20-first-stage flash tank; 30-a secondary flash tank; a-a high pressure condensed water outlet; b-an intermediate pressure steam inlet; c-a low pressure water outlet; d-a low pressure steam inlet; e-a supercooling section; f-a high pressure steam inlet; g-a first cold water passing hole; h-a second cold water passing hole; k-a medium pressure condensate outlet; t-steam inlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
Example 1: as shown in fig. 1, the energy-saving steam air preheater system of the present embodiment includes a steam air preheater 10, a primary flash tank 20, and a secondary flash tank 30;
high-pressure condensed water outlet a on the steam air preheater 10 is communicated with an inlet of the first-level flash tank 20 through a pipeline, a flash steam outlet on the first-level flash tank 20 is communicated with a medium-pressure steam inlet b on the steam air preheater 10 through a pipeline, a low-pressure water outlet c on the first-level flash tank 20 is communicated with an inlet on the second-level flash tank 30 through a pipeline, a flash steam outlet on the second-level flash tank 30 is communicated with a low-pressure steam inlet d on the steam air preheater 10 through a pipeline, and supercooled water after being flashed by the second-level flash tank 30 is input to a supercooling section e on the steam air preheater 10 through a pipeline or is directly drained to a deaerator.
In this embodiment, air enters the steam air preheater 10, the air exchanges heat with steam, the heated air enters the boiler to recover waste heat, the steam can be extracted from a boiler drum or a steam turbine, the high-pressure steam is conveyed to a high-pressure steam inlet f of the steam air preheater 10 through a pipeline, the medium-pressure steam extracted by the steam turbine is introduced into a medium-pressure steam inlet b of the steam air preheater 10 through a pipeline, and the low-pressure steam extracted by the steam turbine is introduced into a low-pressure steam inlet d of the steam air preheater 10 through a pipeline.
The number of the secondary flash tanks 30 and the primary flash tanks 20 is at least 1 in this embodiment.
Embodiment 2 in this embodiment, on the basis of embodiment 1, the steam air preheater 10 is provided with an intermediate pressure condensed water outlet k, and the intermediate pressure condensed water outlet k is communicated with an inlet on the secondary flash tank 30 through a pipeline.
Example 3 this example is based on example 1 or 2, and the steam air preheater 10 is further provided with a first supercooled water outlet g for passing to the deoxygenator.
Embodiment 4 in this embodiment, on the basis of embodiment 1 or 2, the steam air preheater 10 is further provided with a second supercooled water outlet h for leading to a condenser.
Embodiment 5 in the present embodiment, on the basis of embodiment 1 or 2, the steam air preheater 10 is provided with a low-pressure water outlet, and the low-pressure water outlet is communicated with the supercooling section e of the steam air preheater 10 through a pipeline.
Embodiment 6 in the present embodiment, on the basis of embodiment 1 or 2, the steam air preheater 10 is provided with a steam inlet t connected with a four-extraction pipeline of a steam turbine.
In prior art, high pressure steam forms the high pressure condensate water after entering steam air heater 10, and after the high pressure condensate water discharged entering flash tank, steam that produces in the flash tank enters steam air heater 10 again and carries out the heat transfer, and the comdenstion water that forms in the flash tank is arranged to the oxygen-eliminating device, and the waste heat obtains make full use of. High-pressure condensate water that forms in steam air preheater in this embodiment passes through the two-stage flash tank, and the steam of formation returns to steam air preheater 10 and continues to participate in the heat transfer, and the condensate water that forms in the flash tank returns to steam air preheater 10 simultaneously and participates in the heat transfer, and until the heat transfer is abundant, discharge from first excessive cold water mouth g and the second excessive cold water mouth h of steam air preheater 10 again, perhaps directly let in the oxygen-eliminating device.
If the steam extraction interface of the steam turbine is richer than the interfaces, more primary flash tanks 20 and more secondary flash tanks 30 can be further arranged, so that the flash waste heat recovery process is realized more times.
In the description of the present invention, it should be noted 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", etc. indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. An energy efficient steam air preheater system characterized by: the system comprises a steam air preheater, a primary flash tank and a secondary flash tank;
the high-pressure condensed water outlet on the steam air preheater is communicated with the inlet of the first-level flash tank through a pipeline, the flash steam outlet on the first-level flash tank is communicated with the medium-pressure steam inlet on the steam air preheater through a pipeline, the low-pressure water outlet on the first-level flash tank is communicated with the inlet on the second-level flash tank through a pipeline, the flash steam outlet on the second-level flash tank is communicated with the low-pressure steam inlet on the steam air preheater through a pipeline, and the supercooled water after the flash evaporation of the second-level flash tank is input to the supercooling section on the steam air preheater through a pipeline or is directly drained to the deaerator.
2. An energy efficient steam air preheater system according to claim 1, wherein: the number of the secondary flash tanks and the primary flash tanks is at least 1.
3. An energy efficient steam air preheater system according to claim 1, wherein: and a medium-pressure condensed water outlet is arranged on the steam air preheater and is communicated with an inlet on the secondary flash tank through a pipeline.
4. An energy efficient steam air preheater system according to claim 1, wherein: the steam air preheater is also provided with a first supercooled water outlet for leading to the deoxygenator.
5. An energy efficient steam air preheater system according to claim 1, wherein: and a second supercooled water outlet for leading to the condenser is also arranged on the steam air preheater.
6. An energy efficient steam air preheater system according to claim 1, wherein: the steam air preheater is provided with a low-pressure water outlet which is communicated with a supercooling section on the steam air preheater through a pipeline.
7. An energy efficient steam air preheater system according to claim 1, wherein: and a steam inlet connected with a four-extraction pipeline of the steam turbine is arranged on the steam air preheater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120980513.9U CN214840952U (en) | 2021-05-10 | 2021-05-10 | Energy-saving steam air preheater system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120980513.9U CN214840952U (en) | 2021-05-10 | 2021-05-10 | Energy-saving steam air preheater system |
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| CN214840952U true CN214840952U (en) | 2021-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237084A (en) * | 2021-05-10 | 2021-08-10 | 哈尔滨锅炉厂预热器有限责任公司 | Energy-saving steam air preheater system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237084A (en) * | 2021-05-10 | 2021-08-10 | 哈尔滨锅炉厂预热器有限责任公司 | Energy-saving steam air preheater system |
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